CN111918545A - Combine harvester - Google Patents

Abstract

Provided is a combine harvester in which grass pieces discharged from a threshing device are not caught by an exhaust pipe of an engine. An engine (5) is arranged at the front side of the grain box (9). The grain box (9) and the threshing device (8) are arranged in parallel in the transverse width direction of the machine body. An exhaust pipe (15) for exhausting the exhaust gas of the engine (5) passes through the space between the threshing device (8) and the grain box (9) in a tilted state. An exhaust port (25) of the exhaust pipe (15) is opened at a position corresponding to the rear end of the grain tank (9) in space.

Description

Combine harvester

Technical Field

The invention relates to a combine harvester.

Background

(1) Conventionally, there is a combine harvester, which is provided with: a harvesting part which is arranged at the front part of the machine body and harvests crops in a field; a threshing device for threshing the crop harvested by the harvesting unit; and a grain box, which is arranged in the horizontal width direction of the machine body and in the side-by-side state of the threshing device, and stores grains obtained through the threshing device.

In the above-described combine harvester, as described in patent document 1, for example, there are cases where: an engine is arranged at the front side of the grain box, and an exhaust pipe for exhausting the exhaust gas of the engine passes through a space between the threshing device and the grain box in a tilted state.

(2) Conventionally, there is a combine harvester including a straw conveying device for conveying backward a whole straw of harvested straws harvested by a harvesting unit.

In a straw conveying device of a combine harvester, a left and right endless revolving chain (corresponding to an endless revolving body) is wound between a left and right drive sprocket (an example of a downstream side pulley) provided on a lateral drive shaft (an example of a downstream side rotating shaft) located on a downstream side in a conveying direction and an upstream side pulley provided on a lateral upstream side rotating shaft located on an upstream side in the conveying direction, and a plurality of conveying members are supported so as to straddle the left and right endless revolving chains. In order to prevent the reaping stalks from being entangled with the drive shaft, an anti-entanglement cover is provided between the left and right drive sprockets to cover the drive shaft.

The anti-wind cover is made of synthetic resin, and includes a wide inner cover body extending across the left and right drive sprockets and a narrow outer cover body externally inserted to both sides of the inner cover body in the axial direction. The inner and outer shells are each configured to: a slit is formed in the axial direction, and is provided so as to be attachable and detachable so as to surround the rotating shaft from the radially outer side, and the slit, a gap between the inner and outer covers, and the like are closed with paint in a state of being attached to the outer peripheral side of the rotating shaft (for example, refer to patent document 2).

(3) Conventionally, there is a combine harvester including a straw conveying device for conveying backward a whole straw harvested from a harvesting part to a harvested straw.

In a straw conveying device of a combine harvester, a pair of endless revolving chains (corresponding to endless revolving bodies) are wound around a downstream side wheel body provided on a downstream side rotating shaft in a lateral direction on a downstream side in a conveying direction and an upstream side wheel body provided on an upstream side rotating shaft in a lateral direction on an upstream side in the conveying direction in a conveying box for conveying straws, and a plurality of conveying members are provided on the endless revolving chains. Further, a rotary shaft support body for rotatably supporting the upstream rotary shaft around its shaft center is provided inside the conveyance box, and a position adjustment mechanism for variably adjusting the position of the rotary shaft support body in the conveyance direction is provided.

The position adjusting mechanism is provided with an adjusting threaded shaft which is positioned outside the conveying box and extends along the conveying direction, and the adjusting threaded shaft is connected with the rotating shaft supporting body through a supporting bracket which is integrally fixed and through a connecting bolt which penetrates through the conveying box through a long hole in the conveying direction. A compression spring is externally fitted to the adjustment threaded shaft, one end of the compression spring is supported by a spring seat portion (corresponding to a regulation guide portion) fixed to the conveyance case, and the other end of the compression spring is supported by a nut screwed to the adjustment threaded shaft. And, configured to: the support bracket and the compression spring are provided on the same side with respect to the spring seat portion (see, for example, patent document 3).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-128414

Patent document 2: japanese patent laid-open publication No. 2015-139384

Patent document 3: japanese patent laid-open publication No. 2017-35017

Disclosure of Invention

Problems to be solved by the invention

(1) The problems corresponding to the background art (1) are as follows.

In the above-described combine harvester, when the exhaust pipe protrudes rearward from the threshing device, the cut grass that flies after being discharged rearward from the threshing device is likely to be caught on the exhaust pipe.

The invention provides a combine harvester, wherein grass scraps cannot be clamped on an exhaust pipe.

(2) The problems corresponding to the background art (2) are as follows.

In the above-described conventional structure, the anti-wind-up cover can be attached to a portion sandwiched between the left and right drive sprockets (downstream-side wheel bodies) in a state of easily covering the outside of the drive shaft without complication, and can improve rigidity in the vicinity of the left and right drive sprockets so as to be less likely to deform.

However, in the above-described conventional structure, since the slits are formed, the rigidity of the anti-tangling cover is low, the anti-tangling cover may be deformed by receiving a pressing force from the conveyed harvested grain stalks, and the possibility of grass clippings being caught and retained between the slits is high, and the grass clippings are accumulated with short-term use, and thus, a satisfactory conveyance process cannot be performed.

Therefore, it is desirable that the straw conveying device be attached to a portion sandwiched between the left and right downstream side wheel bodies in a state in which the outer side of the downstream side rotating shaft is not covered with a troublesome work, and that good conveying processing be performed for a long period of time.

(3) The problems corresponding to the background art (3) are as follows.

In the above-described conventional structure, the nut screwed to the adjustment screw shaft is turned while the fastening by the connecting bolt is loosened, and thereby the adjustment screw shaft is relatively moved in the conveying direction, and the position of the rotary shaft support body in the conveying direction can be changed to adjust the tension of the endless rotating chain.

In the above-described conventional structure, since the nut is located between the compression spring and the support bracket, when the nut is rotated, it is necessary to insert a wrench, for example, suitable for the nut, as a tool from the radial outside of the adjustment screw shaft in the radial direction. In the case of using a wrench, it is necessary to repeat a work of detaching the wrench after attaching to the nut and rotating by a prescribed angle and attaching again and rotating it. Further, it is necessary to perform work in a narrow and limited space, and it is difficult to perform adjustment work.

Therefore, it is desirable to easily perform the position adjustment work for changing the position of the upstream rotary shaft in the conveying direction.

Means for solving the problems

(1) The solution corresponding to the problem (1) is as follows.

The combine of the present invention comprises: a harvesting part which is arranged at the front part of the machine body and harvests crops in a field; a threshing device for threshing the crop harvested by the harvesting unit; a grain box which is arranged in a state of being parallel to the threshing device in the transverse width direction of the machine body and stores grains obtained by the threshing device; the engine is arranged on the front side of the grain box; and the exhaust pipe discharges the exhaust of the engine, the exhaust pipe passes through the space between the threshing device and the grain box in a backward tilting state, and the exhaust port of the exhaust pipe is arranged in the space and is opened at the position corresponding to the rear end part of the grain box.

According to this configuration, the exhaust pipe does not protrude rearward from the threshing device, and therefore the cut grass discharged rearward from the threshing device does not get caught on the exhaust pipe. In addition, the exhaust gas of the engine discharged from the exhaust port is discharged to the outside of the combine harvester after being radiated by the grain tank and the vicinity of the rear end of the threshing device.

In the present invention, it is preferable that the exhaust port is opened upward from a horizontal direction, and an upper exhaust pipe cover is provided to cover an upper portion of the exhaust port.

According to this configuration, since the exhaust gas is discharged upward from the exhaust port, the exhaust gas is not retained in the space between the threshing device and the grain tank, and is easily released from the upper side to the outside of the machine body. In addition, by providing the upper exhaust pipe cover, rainwater and the like can be prevented from entering from the exhaust port that opens upward.

In the present invention, it is preferable that the rear end portion of the exhaust pipe is disposed in a state of being inclined rearward and upward, and the upper exhaust pipe cover is disposed in a state of being inclined in a direction along which the rear end portion of the exhaust pipe is inclined.

According to this structure, the exhaust gas is guided upward by the inclined exhaust pipe, and flows and is discharged from the exhaust port directly to the rear upper side. Since the upper exhaust pipe cover is disposed in an inclined state, the upper portion can be covered without obstructing the flow of the exhaust gas.

In the present invention, it is preferable that a work table is provided in an upper portion of the space so as to be positioned above the exhaust pipe and extend in the front-rear direction, and the upper exhaust pipe cover is coupled to the work table.

According to this configuration, the work table can be made large in area to facilitate work, and the upper exhaust pipe cover can be supported by the work table without providing a special support member.

In the present invention, it is preferable that the upper exhaust duct cover is disposed so that a rear end portion thereof protrudes upward from the work table and is disposed in a shape of rising upward from the work table, the rear end portion of the upper exhaust duct cover extends rearward from a rear end portion of the exhaust port, and a space on a downstream side in an air outlet direction of the exhaust port is open in the air outlet direction.

According to this configuration, the exhaust gas discharged from the exhaust pipe passes through the lower side of the upper exhaust pipe cover that rises upward relative to the work table and is discharged upward of the work table, and therefore, the exhaust gas can be prevented from staying on the lower side of the work table. The upper exhaust pipe cover, which has a rear end portion extending rearward from the rear end portion of the exhaust port, prevents rainwater and the like from entering the exhaust pipe through the exhaust port. Since the space on the downstream side in the blowing direction is open, the blown exhaust gas is easily diffused into the atmosphere because it is not obstructed.

In the present invention, it is preferable that a vertical frame extending in the vertical direction is provided on a side wall of the threshing device on the grain tank side, the exhaust duct is supported by being placed on a bracket, and the bracket is supported by the vertical frame in a state of protruding from the vertical frame toward the grain tank side.

According to this configuration, the exhaust pipe can be stably supported by the vertical frame having high support strength provided on the side wall of the threshing device.

In the present invention, it is preferable that a side exhaust duct cover which is shaped like a plate from above and below and covers the exhaust duct from the grain tank side is provided between the grain tank and the exhaust duct, and another bracket different from the bracket supporting the exhaust duct is supported by the side wall, and the side exhaust duct cover is supported by the other bracket.

According to this configuration, even if the operator approaches the exhaust pipe from the grain tank side for maintenance, the operation is facilitated because the exhaust pipe is not exposed because it is covered by the side exhaust pipe cover. Further, since the side exhaust pipe cover is supported by a bracket different from the bracket supporting the exhaust pipe, it is easy to prevent the vibration of the exhaust pipe generated by the vibration of the engine from being transmitted to the side exhaust pipe cover. As a result, it is possible to avoid the occurrence of noise and loosening of the bolt connection due to the minute vibration of the side exhaust pipe cover.

In the present invention, it is preferable that the exhaust pipe includes: a first exhaust pipe portion having an inlet port for introducing exhaust gas of the engine; and a second exhaust pipe portion connected to a rear portion of the first exhaust pipe portion and having the exhaust port at a rear end thereof, the first exhaust pipe portion including: a first inclined portion located on the front side and extending in a tilted posture of tilting backward; a first horizontal portion located on a rear side and extending in a horizontal posture; and a first bent portion that connects the first inclined portion and the first horizontal portion in a continuous state, the second exhaust pipe portion including: a second horizontal portion located on the front side and extending in a horizontal posture; a second inclined portion located on the rear side and extending in a tilted posture of a back tilt; and a second bent portion connecting the second horizontal portion and the second inclined portion in a continuous state, the first exhaust pipe portion and the second exhaust pipe portion having a double pipe portion.

According to this configuration, the exhaust gas of the engine is guided upward and rearward by the first inclined portion, then guided to the horizontal direction by the first horizontal portion and the second horizontal portion, and is guided upward and rearward by the second inclined portion at the rear end side and discharged to the outside. Further, since the first exhaust pipe portion and the second exhaust pipe portion have the double-walled pipe portion, heat dissipation of the heat of the high-temperature exhaust gas to the outside of the space can be suppressed by the heat insulating effect of the double-walled pipe portion.

In the present invention, it is preferable that the first exhaust pipe portion is a single-layer pipe, the first bent portion and the first horizontal portion are double-layer pipes, and the second exhaust pipe portion is a double-layer pipe in which the second horizontal portion, the second bent portion, and the second inclined portion are all double-layer pipes.

According to this configuration, since the first inclined portion extends in a tilted posture of the rear tilt, even if dust such as grass clippings which is susceptible to heat, for example, is scattered upward, the dust is not accumulated and is easily guided downward.

Therefore, the disadvantage caused by the accumulation of the grass clippings and the like is avoided, and the cost is reduced by using the single-layer pipe with a simple structure. By forming the portion other than the first inclined portion as a double pipe, it is possible to prevent heat of the high-temperature exhaust gas from being transmitted to the outer peripheral side, and to prevent occurrence of a problem due to the heat.

In the present invention, it is preferable that the exhaust pipe includes: a first exhaust pipe portion having an inlet port for introducing exhaust gas of the engine; a second exhaust pipe portion connected to a rear portion of the first exhaust pipe portion; and a third exhaust pipe portion connected to a rear portion of the second exhaust pipe portion, having the exhaust port, and gaps through which air flows from outside to inside of the exhaust pipe being formed between the first exhaust pipe portion and the second exhaust pipe portion and between the second exhaust pipe portion and the third exhaust pipe portion, respectively.

According to this configuration, since the exhaust gas is cooled by the air flowing from the outside of the exhaust pipe between the first exhaust pipe portion and the second exhaust pipe portion and between the second exhaust pipe portion and the third exhaust pipe portion, the exhaust gas is discharged to the outside of the combine harvester in a state where the temperature thereof is lowered.

In the present invention, it is preferable that the front and rear portions of the first exhaust pipe portion are supported by the threshing device, the front and rear portions of the second exhaust pipe portion are supported by the threshing device, and the third exhaust pipe portion is supported by the second exhaust pipe portion.

According to this configuration, since the first exhaust pipe portion, the second exhaust pipe portion, and the third exhaust pipe portion can be supported by the grain tank, the grain tank can be opened and closed easily without requiring much labor to connect or disconnect the exhaust pipe and the grain tank, as compared with the case where the exhaust pipe is supported by the grain tank.

In the present invention, it is preferable that: a winnowing device which is vertically arranged in the space, is connected with the lower part of the threshing device and the upper part of the grain box, and supplies the grains obtained by the threshing device to the grain box; a front support member extending from an upper portion of a side wall of the grain tank side of the threshing device to the grain tank side through a front of the winnowing device, and supporting a front portion of the winnowing device; a rear supporting member extending from the upper portion of the sidewall to the grain box side through the rear of the winnower to support the rear of the winnower; and a gap filling member provided between the side wall and the grain raising device so as to straddle the front support member and the rear support member, wherein a rear portion of the first discharge duct portion is supported by the front support member, and a front portion of the second discharge duct portion is supported by the rear support member.

According to this structure, grass clippings and the like can be prevented from entering the gap between the front support member and the rear support member, and the winnowing device can be firmly supported by the threshing device. The first exhaust pipe section can be supported by the threshing device with a simple support structure in which the front support member is used as a member for connecting the first exhaust pipe section and the threshing device. The second exhaust pipe portion can be supported by the threshing device with a simple support structure in which the rear support member is used as a member for connecting the second exhaust pipe portion and the threshing device.

In the present invention, it is preferable that the first exhaust pipe portion is arranged in a tilted posture of being tilted backward, the second exhaust pipe portion is arranged in a horizontal posture, the first exhaust pipe portion and the third exhaust pipe portion are single-layer pipes, and the second exhaust pipe portion is a double-layer pipe.

According to this configuration, the second exhaust pipe portion is located at a high position in the space where the heat of the second exhaust pipe portion is likely to be dissipated to the outside of the space, but since the heat dissipation of the inner pipe portion of the second exhaust pipe portion is suppressed by the heat insulating effect of the outer pipe portion, the heat dissipation of the second exhaust pipe portion to the outside of the space can be suppressed.

In the present invention, it is preferable that a work table is provided in an upper portion of the space so as to be positioned above the exhaust pipe and so as to extend in a front-rear direction, the work table extends to a rear side of the exhaust port, and a cutout portion is formed in a portion of the work table corresponding to the exhaust port of the exhaust pipe.

According to this configuration, the area of the work table is increased to facilitate work, and the exhaust gas discharged from the exhaust pipe is discharged to the upper side of the work table through the notch portion, so that the exhaust gas can be prevented from staying at the lower side of the work table.

In the present invention, it is preferable that the threshing device further includes a support frame extending upward from a side wall of the threshing device on the grain tank side, the support frame supporting the exhaust duct and the work table.

According to this configuration, the exhaust pipe and the work table can be supported by the threshing device with a simple support structure in which the support frame is used for both the support of the exhaust pipe to the threshing device and the support of the work table to the threshing device.

In the present invention, it is preferable that the threshing machine body of the threshing device includes a machine body main body and a ceiling portion supported by an upper portion of the machine body main body, the exhaust duct passes through a space portion between the machine body main body and the grain tank in the space, and the exhaust port opens in the space portion.

According to this configuration, when the operation for the top plate is performed, such as the inspection of the top plate, the operation is easily performed so that the exhaust pipe does not easily become an obstacle.

In the present invention, it is preferable that: a grain discharging device connected to the rear of the grain box, extending in the vertical direction of the body, and discharging grains from the grain box; a supporting column which is vertically arranged at a position adjacent to the grain discharging device and supports the grain discharging device; and a transverse frame connecting the side wall of the grain box side of the threshing device with the support, wherein the exhaust port is positioned at the front side of the transverse frame.

According to this configuration, since the distance over which the exhaust gas discharged from the exhaust pipe flows after exiting from the exhaust port to be discharged to the outside of the combine while radiating heat becomes long, the exhaust gas is discharged in a state of being lower in temperature than the outside of the combine.

In the present invention, it is preferable that the grain tank further includes a side exhaust duct cover that is provided between the grain tank and the exhaust duct so as to straddle a position corresponding to a front end portion of the grain tank and a position corresponding to a rear end portion of the grain tank, and that covers the exhaust duct from the grain tank side, and the side exhaust duct cover extends to a rear side of the exhaust port.

According to this configuration, when performing work such as inspection on a part of the exhaust pipe located on the opposite side of the threshing device, the exhaust pipe is covered by the side exhaust pipe cover and is not exposed to the work side, so that the flow of the exhaust gas discharged from the exhaust pipe to the work side is prevented by the side exhaust pipe cover, and the work is facilitated.

In the present invention, it is preferable that: a work table provided above the exhaust pipe and extending in a front-rear direction above the space; a winnowing device which is vertically arranged in the space, is connected with the lower part of the threshing device and the upper part of the grain box, and supplies the grains obtained by the threshing device to the grain box; a front support member extending from an upper portion of a side wall of the grain tank side of the threshing device to the grain tank side through a front of the winnowing device, and supporting a front portion of the winnowing device; a rear supporting member extending from the upper portion of the sidewall to the grain box side through the rear of the winnower to support the rear of the winnower; and a gap filling member provided between the side wall and the grain thrower so as to straddle the front support member and the rear support member, wherein the work table includes: a front table portion extending forward from the front support member; and a rear work table portion extending rearward from the rear support member.

According to this configuration, the grain thrower can be firmly supported by the threshing device via the front support member and the rear support member, and the clearance filling member can prevent grass clippings and the like from entering the clearance between the front support member and the rear support member. In the work table, a work table gap is generated between the front work table portion and the rear work table portion, but the work table gap is closed by the gap filling member, and therefore, work is easily performed.

In the present invention, it is preferable that a rear portion of the front table section is supported by the front support member, and a front portion of the rear table section is supported by the rear support member.

According to this configuration, the work table can be supported by a simple support structure in which the front support member supporting the grain raising device is used as the support member of the front work table portion and the rear support member supporting the grain raising device is used as the support member of the rear work table portion. In addition, the work table can be supported by the threshing device with a simple support structure.

(2) The solution corresponding to the problem (2) is as follows.

The combine harvester of the present invention is characterized by comprising: the harvesting part is arranged at the front part of the machine body; a grain straw conveying device which is connected with the rear part of the harvesting part and conveys the whole straw of the harvested grain straw harvested by the harvesting part to the rear part; and a threshing device that threshes the harvested grain stalks transported by the grain stalk transport device, wherein the threshing device is provided with a threshing cylinder that is rotationally driven around an axial core in the front-rear direction of the machine body, and the grain stalk transport device is provided with: a conveying box for conveying the grain and straw; a lateral downstream-side rotating shaft that is erected on a downstream side in a conveying direction of the conveying box; left and right downstream side wheel bodies provided on the downstream side rotating shaft at intervals in a shaft center direction of the downstream side rotating shaft; a transverse upstream rotary shaft that is erected upstream of the conveyance box in the conveyance direction; an upstream-side wheel body provided on the upstream-side rotating shaft; left and right annular rolling bodies wound so as to straddle the downstream-side rolling body and the upstream-side rolling body and provided at a left-right interval; a plurality of conveying members which are transversely arranged across the left and right annular rotating bodies at intervals in a conveying direction; and a tubular anti-tangling cover, wherein the left and right downstream side wheels are externally inserted to the downstream side rotating shaft, a grain and straw conveying inlet is formed on the front wall part of the threshing device at a position corresponding to the lower part of the threshing cylinder when viewed from the front, the grain and straw conveying device is connected with the grain and straw conveying inlet, the anti-tangling cover is composed of two divided cover bodies divided along the axial core direction of the downstream side rotating shaft, one divided cover body of the two divided cover bodies is inserted into the end part of the other divided cover body of the two divided cover bodies in a mode of having an overlapping part, and the anti-tangling cover is equipped in the following state: when the threshing device is observed from the front, the dividing cover body on the other side is positioned on the upstream side of the rotation direction of the threshing cylinder, and the dividing cover body on one side is positioned on the downstream side of the rotation direction of the threshing cylinder.

According to the present invention, the antiwind cover includes two divided covers, and is configured such that the divided cover on one side is inserted into an end portion of the divided cover on the other side with an overlapping portion.

The antiwind cover having such a structure can be formed in a cylindrical shape to improve rigidity.

Further, since the length of the end portions on both sides in the left-right direction changes by changing the overlapping range of the two split covers, for example, the two split covers can be positioned on the outer peripheral portion of the downstream-side rotating shaft between the left and right downstream-side wheels in a state of being away from the downstream-side wheels in a state of widening the overlapping range, and can be set in a state of being close to the left and right downstream-side wheels by pulling the two split covers so that the overlapping range is narrowed at the time of assembly.

The harvested grain stalks conveyed by the grain stalk conveying device are supplied to the threshing device through a grain stalk carrying inlet formed at a front wall portion of the threshing device at a position corresponding to a lower portion of the threshing cylinder when viewed from the front. When the grain and straw inlet is seen in front view, the threshing cylinder is in a state of rotating from one part of the grain and straw inlet in the left-right direction to the other part in the left-right direction.

In the anti-wind cover, the other divided cover body on the larger diameter side is positioned on the upstream side in the rotation direction of the threshing cylinder, and the divided cover body on the smaller diameter side is positioned on the downstream side in the rotation direction of the threshing cylinder, as viewed from the front. As a result, the harvested straw conveyed with the rotation of the threshing cylinder is guided from the outer surface of the large-diameter side divided cover body to the outer surface of the small-diameter side divided cover body, and therefore the possibility that the cut grass enters the gap at the overlapping portion becomes small.

Therefore, the anti-wind cover can be attached to the portion sandwiched between the left and right downstream side wheel bodies without troublesome work, and the possibility that the reaped straws are wound around the anti-wind cover and accumulated due to clogging of grass clippings or the like is reduced, and a good transportation process can be performed for a long period of time.

In the present invention, it is preferable that the overlapping portion is located on an upstream side in a rotation direction of the threshing cylinder from a left-right center position between the left and right downstream side wheel bodies in a front view, the upstream side being offset from the grain straw carrying port.

In the threshing device, the reaped grain stalks rotate in a state driven by a rotating threshing cylinder, and the reaped grain stalks conveyed by the grain conveying device are merged with the reaped grain stalks conveyed in a state driven by the threshing cylinder at the downstream side part of the rotation direction of the threshing cylinder in a grain stalk conveying inlet, so that the reaped grain stalks are more in number than the reaped grain stalks at the upstream side part of the rotation direction of the threshing cylinder. However, according to this configuration, since the overlapping portion is located at a position offset to the upstream side in the rotation direction of the threshing cylinder, the possibility of interfering with the transfer of the harvested straws transported by the overlapping portion is small compared to the case where the overlapping portion is located at the downstream side in the rotation direction of the threshing cylinder, and good transportation processing is facilitated.

In the present invention, it is preferable that the threshing mechanism further includes a fastening member that penetrates the one divided cover and the other divided cover in the radial direction and is fixed thereto, and the fastening member is located at a position that is offset toward the upstream side in the rotation direction of the threshing cylinder in the grain and straw carrying-in port from the center position in the right and left directions of the overlapping portion in a front view.

According to the present structure, the two divided covers are fixed by the fastener. Since the fastener is provided in a state of penetrating in the radial direction, the two divided covers can be firmly coupled to each other, for example, compared to a case of being coupled by paint or the like.

Further, the fastening member is located at a position on the upstream side in the rotation direction of the threshing cylinder from the left and right center positions of the overlapping portion where the amount of harvested straw is assumed to be small in the straw carrying-in port, and therefore, the harvested straw is less likely to be caught, entangled, and accumulated than a structure located on the downstream side in the rotation direction of the threshing cylinder.

In the present invention, it is preferable that a plurality of the fastening members are provided at intervals in the circumferential direction of the wind-shield cover.

According to this configuration, the two split covers are firmly coupled at a plurality of locations by the fastening means at circumferentially spaced intervals. For example, even when a load of the reaped straw is applied in a direction orthogonal to the axial core, the possibility that the two divided covers are deformed by the load of the reaped straw is small as compared with a structure in which only one portion is connected by a fastener, and a good conveyance process can be continued.

In the present invention, it is preferable that the harvesting unit has a harvesting width wider than a lateral width of the straw conveying device, and the straw conveying device is connected to the harvesting unit in a state of being offset toward a side of the harvesting unit corresponding to an upstream side in a rotation direction of the threshing cylinder with respect to the straw carrying-in port in a front view.

According to this configuration, the grain and straw conveying device is biased toward the grain and straw conveying inlet, which corresponds to the upstream side in the rotation direction of the threshing cylinder, with respect to the harvesting section when viewed from the front. That is, the harvesting width of the harvesting unit on the downstream side of the rotation direction of the threshing cylinder from the straw conveying device is larger than the harvesting width on the opposite side, that is, on the upstream side of the rotation direction of the threshing cylinder. As a result, in the grain and straw conveying apparatus, the number of harvested grain and straw is larger at a portion on the downstream side in the rotation direction of the threshing cylinder than at a portion corresponding to the upstream side in the rotation direction of the threshing cylinder.

Therefore, although there are a large number of harvested straws transported by the grain transporting device at the downstream side in the rotation direction of the threshing cylinder at the straw transport inlet, the number of harvested straws is small at the upstream side in the rotation direction of the threshing cylinder at the straw transport inlet, and therefore there is less possibility that the harvested straws are wound around the anti-wind cover and stacked due to gaps between the overlapping portions where the straws enter, clogging of the straws, and the like.

In the present invention, it is preferable that a circumferential groove having substantially the same shape as that of the anti-wind-up cover and recessed over the entire circumference is formed in a lateral surface on an inner side in the left-right direction of each of the left and right downstream side wheels, the anti-wind-up cover is provided in a state in which a left-right direction one end portion of the one divided cover is fitted into the circumferential groove formed in the downstream side wheel on one side in the left-right direction and a left-right direction other end portion of the other divided cover is fitted into the circumferential groove formed in the downstream side wheel on the other side in the left-right direction, an outer diameter of the one end portion of the one divided cover is the same as an outer diameter of the other end portion of the other divided cover, and the other divided cover: the outer diameter of the end portion on one side overlapping the divided cover on the one side is larger than the outer diameter of the end portion on the other side.

According to this configuration, the end portions on both sides in the axial direction of the anti-wind cover are respectively fitted into the circumferential grooves formed in the downstream-side wheel body to form a labyrinth structure, so that grass chips and the like can be prevented from being caught in the gap between the anti-wind cover and the downstream-side wheel body. Since the outer diameters of the windup prevention cover on both sides in the axial direction are the same, the left and right downstream wheels can share the same left and right structural members.

In the present invention, it is preferable that a constricted portion that deforms the other end portion to a smaller diameter is formed in a portion of the other divided cover body that is offset to the other side in the left-right direction from the left-right direction center position.

According to this configuration, the portion of the other divided cover body that fits over the one divided cover body is larger in diameter than the one divided cover body, but the diameter of the end portion on the other side is reduced by the formation of the constricted portion and becomes the same as the diameter of the one divided cover body.

Therefore, the two divided covers are inserted to have the overlapping portion, and both end portions of the anti-wind cover in the axial direction are formed to have the same diameter, so that the left and right downstream wheels can share the same left and right structural members.

In the present invention, it is preferable that the downstream wheel body includes: a base end portion located radially inside and externally fitted to the downstream-side rotary shaft so as to be rotatable integrally with the downstream-side rotary shaft; and a wheel body main body portion located radially outward of the base end portion, the wheel body main body portion having a winding portion around which the toroidal rotating body is wound, the base end portion being formed to have a projecting cylindrical portion projecting in an axial direction from the wheel body main body portion and having a width in the axial direction larger than that of the wheel body main body portion, a flat portion being formed on an outer circumferential surface of the downstream side rotating shaft, a threaded hole in a radial direction being formed in a position of the projecting cylindrical portion of the base end portion facing the flat portion, and the combine harvester abutting a bolt attached so as to pass through the threaded hole against the flat portion to hold a position of the downstream side wheel body in the axial direction.

According to this configuration, the flat portion for transmitting the rotational power to the downstream rotary shaft is formed on the outer peripheral surface of the downstream rotary shaft, and the bolts attached through the screw holes in the radial direction are brought into contact with the flat portion to hold the position of the downstream wheel body. As a result, it is not necessary to perform special penetration processing for holding the position of the downstream rotary shaft, for example, a recessed portion into which the bolt is inserted in the radial direction, and it is possible to easily avoid disadvantages such as reduction in shaft strength due to the penetration processing and premature breakage in use.

In the present invention, it is preferable that: an abutting member located at one end in the axial direction of the downstream-side rotating shaft and fixed in position in the axial direction; a first cylindrical member provided between the abutment member and one of the left and right downstream side wheel bodies, and having a length corresponding to an interval therebetween; a second cylinder member provided between the downstream-side wheel body on the one side and the downstream-side wheel body on the other side, and having a length corresponding to an interval therebetween; and a fixing member capable of fixing the position of the downstream-side wheel body on the other side in the axial direction.

According to this configuration, the gap between the abutment member and the one downstream side wheel body is restricted by the first cylinder member, the gap between the one downstream side wheel body and the other downstream side wheel body is restricted by the second cylinder member, and the position of the other downstream side wheel body in the axial direction can be restricted by the fixing member. As a result, even when the operator mounts the left and right downstream side wheels to the downstream side rotary shaft, the operator can perform positioning simply by fitting the first cylinder member, the one downstream side wheel, the second cylinder member, and the other downstream side wheel in this order and attaching them without performing troublesome positioning work.

(3) The solution corresponding to the problem (3) is as follows.

The combine of the present invention is characterized by comprising: a harvesting part arranged at the front part; and a straw conveyance device connected to a rear portion of the harvesting unit and conveying the whole straw of the harvested straw harvested by the harvesting unit to a rear portion, the straw conveyance device including: a conveying box for conveying the grain and straw; a lateral downstream-side rotating shaft located on a downstream side in a conveying direction of the conveying box; a downstream-side wheel body provided on the downstream-side rotating shaft; a lateral upstream-side rotating shaft located on the upstream side of the conveying box in the conveying direction; an upstream-side wheel body provided on the upstream-side rotating shaft; a plurality of annular rotating bodies wound so as to straddle the downstream-side wheel body and the upstream-side wheel body; a plurality of conveying members which are transversely erected so as to straddle the plurality of endless rotating bodies; a rotary shaft support body that supports the upstream rotary shaft so as to be rotatable about a shaft center thereof and supports the upstream rotary shaft so as to be changeable in position in a conveying direction in the conveying box; and a position adjustment mechanism capable of changing a position of the rotary shaft support body in the conveying direction and fixing the rotary shaft support body at the changed position, the position adjustment mechanism including: an adjustment screw shaft extending in the conveying direction; a coupling portion that couples the adjustment screw shaft and the rotation shaft support body; a regulating guide section supported by the conveyance case and having an insertion section through which the adjusting screw shaft is movably inserted; a nut attached to the adjustment threaded shaft; and a compression spring externally inserted to the adjustment threaded shaft in a state of straddling the nut and the regulation guide portion, wherein the coupling portion is located on a side opposite to the compression spring with respect to the regulation guide portion.

According to this configuration, the compression spring is externally fitted to the adjustment screw shaft, and the adjustment screw shaft and the rotation shaft support member are coupled by the coupling portion. The adjusting screw shaft is movably inserted through an insertion portion of a regulating guide portion supported by the conveying box. The compression spring is located on the opposite side of the connection portion with respect to the regulation guide portion, and the nut is also located on the opposite side of the connection portion with respect to the regulation guide portion. In a portion of the adjusting threaded shaft to which the nut is screwed, an end portion of the shaft is in an open state extending in a cantilever shape.

In this way, the nut is screw-attached to the portion extending in the cantilever shape on the side where the guide portion and the coupling portion are not restricted in the adjustment threaded shaft, and therefore, when the nut is attached with a tool, the nut can be attached while moving from the outside in the axial direction of the adjustment threaded shaft toward the axial direction. As a result, for example, a tool such as a ratchet wrench having a socket attachable in the axial direction with respect to the nut can be used. In the case of a ratchet wrench, even if the handle is swung back and forth, the nut can be tightened only in a predetermined direction, and the nut can be easily tightened.

Therefore, even if the position adjustment work is performed in a narrow work space, the position adjustment work for changing the position of the upstream rotary shaft in the conveying direction can be easily performed.

In the present invention, it is preferable that the rotation shaft support is disposed in a state of being positioned inside the transport box, the adjustment screw shaft is disposed in a state of being positioned outside the transport box, and the connection portion includes: a flange portion coupled to an end of the adjusting threaded shaft; and an inside-outside communication portion that connects the flange portion and the rotation shaft support body in a state of being straddled between the inside and the outside of the conveyance case.

According to this configuration, the driven shaft can be stably supported by the rotation shaft support body provided inside the conveyance case, and the adjustment operation can be performed with the adjustment screw shaft not affected by dust such as grass clippings in the conveyance case by providing the flange portion connected to the shaft end of the adjustment screw shaft outside the conveyance case.

The inner and outer communicating portions connecting the flange portion and the rotary shaft support body are provided so as to straddle the inside and outside of the conveyance case, but the inner and outer communicating portions are provided with a margin so that the position of the rotary shaft support body in the conveyance direction can be changed.

In the present invention, it is preferable that a notch into which the adjustment threaded shaft can be inserted in the radial direction is formed in the regulation guide portion, and a spacer is provided between the regulation guide portion and the compression spring and between the nut and the compression spring.

According to this structure, when attaching the adjustment threaded shaft to the regulation guide portion, the adjustment threaded shaft can be attached so as to enter from the outside in the radial direction through the notch, and the work can be easily performed. Further, by providing the spacer between the restriction guide portion and the compression spring, the compression spring can be moved and urged in a state where there is no problem such as damage caused by being caught in the notch formed in the restriction guide portion.

In the present invention, it is preferable that the spacer provided between the nut and the compression spring is provided with a cylindrical member extending in the axial direction of the adjustment threaded shaft on an outer peripheral portion of the compression spring.

According to this configuration, since the outer periphery of the compression spring is covered with the cylindrical member, it is possible to avoid such a disadvantage that dust, mud, or the like generated in association with the harvesting operation is scattered and attached to the compression spring, and the biasing function of the compression spring is previously impaired.

In the present invention, it is preferable that a lateral frame having a substantially U-shaped cross section and extending in the conveying direction be provided on an outer side surface of the conveying box, the lateral frame be fixed in a state where a bottom surface portion of a plurality of U-shaped surface portions is in contact with the outer side surface of the conveying box, the adjustment screw shaft be provided in an inner region of the lateral frame surrounded by the plurality of U-shaped surface portions, and the regulation guide be provided inside the inner region of the lateral frame so as to straddle up and down in a state where the regulation guide be fixed to an inner surface of the inner region.

According to this configuration, the cross section of the lateral frame is formed in a substantially U-shape, and the bottom surface portion is fixed to the outer surface of the conveyance case, so that the lateral frame is firmly supported with a large support strength. Since the adjusting screw shaft is provided in the inner region of the lateral frame, crops and the like are received by the lateral frame and prevented from contacting the adjusting screw shaft, and the durability of the adjusting screw shaft can be improved. The restricting guide portion can be firmly supported by being connected to the bottom surface and the left and right side surface portions of the U-shaped inner region of the lateral frame.

In the present invention, it is preferable that a front frame and a rear frame are provided on an outer side surface of the conveyance case at intervals in the conveyance direction, the front frame and the rear frame are provided so as to straddle the conveyance case in the up-down direction, and the lateral frame is provided so as to straddle the front frame and the rear frame.

According to this configuration, the lateral frame supports the front and rear sides by straddling the front and rear side frames extending vertically, and therefore, the portion to which the tension of the toroidal rotating body is applied can be supported by the strong support structure.

Drawings

Fig. 1 is a view showing a first embodiment (hereinafter, fig. 18 are views of the first embodiment), and is a right side view showing the whole of a combine harvester.

Fig. 2 is a plan view showing the whole of the combine harvester.

Fig. 3 is a rear view of the combine.

Fig. 4 is a left side view showing the exhaust pipe, the exhaust pipe cover, and the work table.

Fig. 5 is a right side view showing the exhaust pipe, the exhaust pipe cover, and the work table.

Fig. 6 is an exploded perspective view showing the exhaust pipe, the exhaust pipe cover, and the work table.

Fig. 7 is a view in section VII-VII of fig. 4.

Fig. 8 is a sectional view VIII-VIII of fig. 4.

Fig. 9 is a plan view showing a space filling member installation part.

Fig. 10 is a right side view showing the whole of the combine harvester according to the second embodiment.

Fig. 11 is a plan view showing the whole of the combine harvester according to the second embodiment.

Fig. 12 is a right side view showing the exhaust pipe and the work table.

Fig. 13 is a vertical right side view showing the exhaust pipe and the work table.

Fig. 14 is an exploded perspective view showing a support structure of the exhaust pipe.

Fig. 15 is an exploded perspective view showing a support structure of the exhaust pipe cover and the work table.

Fig. 16 is a longitudinal rear view of the exhaust pipe.

Fig. 17 is a longitudinal sectional front view of the exhaust pipe.

Fig. 18 is a plan view of the second exhaust pipe portion.

Fig. 19 is a view showing the second embodiment (hereinafter, fig. 31 are views of the second embodiment), and is an overall side view of the combine harvester.

Fig. 20 is an overall plan view of the combine harvester.

FIG. 21 is a longitudinal cross-sectional side view of the feeder.

FIG. 22 is a cross-sectional top view of the rear of the feeder.

Fig. 23 is a front view of the front of the threshing device.

FIG. 24 is a cross-sectional top view of the rear of the feeder when assembled.

Fig. 25 is a partial cross-sectional top view of the endless rotating chain.

Fig. 26 is a side view showing a state in which the drive sprocket is engaged with the endless rotating chain.

Fig. 27 is a plan view of the right end of the harvesting section.

FIG. 28 is a cross-sectional top view of a rear portion of a feeder of another embodiment.

FIG. 29 is a cross-sectional top view of a left side portion of a rear portion of a feeder of another embodiment.

FIG. 30 is a cross-sectional top view of a right side portion of a rear portion of a feeder of another embodiment.

FIG. 31 is a cross-sectional view taken along line XXXI-XXXI of FIG. 30.

Fig. 32 is a view showing the third embodiment (hereinafter, fig. 42 are views of the third embodiment), and is an overall side view of the combine harvester.

Fig. 33 is an overall plan view of the combine harvester.

FIG. 34 is a longitudinal cross-sectional side view of the feeder.

FIG. 35 is a cross-sectional top view of the front of the feeder.

FIG. 36 is a cross-sectional top view of the front of the feeder.

FIG. 37 is a left side view of the front of the feeder.

FIG. 38 is a right side view of the front of the feeder.

Fig. 39 is a view showing a left-side restriction guide portion.

Fig. 40 is a view showing the right-side restriction guide portion.

Fig. 41 is a side view of the hydraulic cylinder arrangement portion.

Fig. 42 is a bottom view of the feeder showing a locking mechanism.

Detailed Description

[ first embodiment ]

[ one of ]

Hereinafter, one of first embodiments of a combine harvester as an example of the present invention will be described with reference to the drawings.

In the following description, regarding the body of the all-feed type combine harvester, the direction of arrow F shown in fig. 1 and 2 is referred to as "body front", the direction of arrow B is referred to as "body rear", the direction of arrow U shown in fig. 1 and 3 is referred to as "body upper", the direction of arrow D is referred to as "body lower", the direction of arrow L shown in fig. 2 and 3 is referred to as "body left", and the direction of arrow R is referred to as "body right".

[ integral structure of whole-feed combine harvester ]

As shown in fig. 1 and 2, a frame-shaped machine frame 1 formed by combining rod-shaped frame members and the like and a pair of left and right crawler type traveling devices 2 attached to a lower portion of the machine frame 1 are provided in a machine body of a full-feed type combine harvester. A driver 3 is provided at one lateral side of the body. The boarding space of the cab 3 is covered by the cab 4. An engine room 6 having an engine 5 is provided below the cab 3. A harvesting part 7 for harvesting standing straws of rice, wheat, etc. as crops in the field is provided at the front part of the machine body in a liftable manner. The back part of the machine body frame 1 is provided with a threshing device 8 and a grain box 9. The threshing device 8 and the grain tank 9 are provided side by side in the transverse width direction of the machine body. A feeder 10 is provided so as to straddle the harvesting unit 7 and the threshing device 8. The whole of the straw harvested by the harvesting unit 7 from the root to the ear tip is supplied to the threshing device 8 by the feeder 10, and threshing is performed in the threshing device 8. A winnowing device 11 is vertically arranged between the threshing device 8 and the grain box 9. The winnower 11 is connected to a grain discharge part formed at the lower part of the threshing device 8 and a grain supply part formed at the upper part of the grain box 9. The grains obtained by the threshing device 8 are supplied to the grain tank 9 by the winnowing device 11 and stored in the grain tank 9. A first grain discharging device 12A is connected to a grain discharging portion formed at the rear of the grain box 9, and a second grain discharging device 12B extends from the upper end portion of the first grain discharging device 12A. The first grain discharging device 12A extends from the grain discharging portion of the grain tank 9 in the vertical direction of the machine body. A second grain discharge device 12B extends transversely from the upper end portion of the first grain discharge device 12A. Grain can be removed from the grain bin 9 by a first grain discharge device 12A and a second grain discharge device 12B.

As shown in fig. 1 and 2, the engine 5 is provided on the front side of the grain tank 9. An exhaust gas purification device 13 for purifying exhaust gas of the engine 5 is provided in a portion of the engine room 6 located above the engine 5. The exhaust gas purification device 13 is introduced into the exhaust gas of the engine 5, and an exhaust gas purification process is performed in which diesel particulates contained in the introduced exhaust gas are collected by a collection filter (not shown) to reduce the diesel particulates. The exhaust gas after the purification treatment is discharged from the discharge cylinder 14.

[ Structure of exhaust pipe ]

As shown in fig. 1 and 2, an exhaust pipe 15 is connected to the exhaust cylinder 14 of the exhaust gas purification apparatus 13. As shown in fig. 1, 2, and 3, the exhaust duct 15 passes through the space between the thresher 8 and the grain tank 9 in a backward tilted state. The exhaust port 25 of the exhaust duct 15 opens at a position in the space 16 corresponding to the rear end of the grain tank 9.

The threshing machine body of the threshing device 8 includes a machine body 8A forming a lower portion of the threshing chamber and a top plate portion 8B supported on an upper portion of the machine body 8A and forming an upper portion of the threshing chamber. In the present embodiment, as shown in fig. 4, 5, 7, and 8, the exhaust duct 15 passes through a space portion 16a between the body main body 8A and the grain tank 9 in the space 16. The exhaust port 25 opens at the space portion 16 a.

Specifically, as shown in fig. 4 and 6, the exhaust pipe 15 includes a first exhaust pipe portion 17, a second exhaust pipe portion 18, and a third exhaust pipe portion 19.

As shown in fig. 4 and 5, the first exhaust pipe portion 17 is arranged to extend over a portion laterally outside the engine room 6 and the space portion 16a in a state where the front end side portion is tilted rearward and the rear end side portion is horizontal. The first exhaust pipe 17 is supported by the threshing device 8 through the front and rear portions.

Specifically, as shown in fig. 4 and 7, the first exhaust pipe 17 includes a front connection portion 17f formed at a front portion of the first exhaust pipe 17. The front connection portion 17f and the bracket 20 supported by the side wall 8c of the threshing device 8 on the grain box side are connected by a connection bolt.

As shown in fig. 6, the first exhaust pipe portion 17 includes a rear connection portion 17r formed at a rear portion of the first exhaust pipe portion 17. As shown in fig. 4, 7, and 9, the rear connection portion 17r and the front support member 21 located on the front side of the grain raising device 11 are connected by a connection bolt. As shown in fig. 7 and 9, the front support member 21 extends from a frame portion 8d provided at an upper portion of a side wall 8c of the threshing device 8 on the grain tank side toward the grain tank side through the front of the winnowing device 11, and supports the front portion of the winnowing device 11 at an extending end side portion. The rear part of the first exhaust pipe 17 is supported by the threshing device 8 by using a front support member 21 for supporting the winnowing device 11 on the threshing device 8 as a connecting member between the first exhaust pipe 17 and the side wall 8c of the threshing device 8.

As shown in fig. 4, 5, and 6, the first exhaust pipe 17 includes an introduction cylinder 22 formed as an introduction port for exhaust gas in a front portion of the first exhaust pipe 17, and is connected to the discharge cylinder 14 through the introduction cylinder 22. As shown in fig. 4, the connection between the introduction cylinder portion 22 and the discharge cylinder 14 is performed in a state where the introduction cylinder portion 22 is externally fitted to the discharge cylinder 14 and a gap S1 is formed between the inner peripheral portion of the introduction cylinder portion 22 and the outer peripheral portion of the discharge cylinder 14. The exhaust gas is discharged from the discharge cylinder 14 to the introduction cylinder 22 and flows into the first exhaust pipe 17. Due to the ejector effect by the flow of the exhaust gas discharged from the discharge cylinder 14 to the intake cylinder 22, the air outside the exhaust pipe 15 is introduced into the first exhaust pipe portion 17 through the gap S1, the introduced air is mixed with the exhaust gas flowing inside the first exhaust pipe portion 17, and the exhaust gas is cooled by the air. That is, the first cooling portion C1 utilizing the ejector effect is disposed between the discharge tube 14 and the first exhaust pipe portion 17.

The second exhaust pipe portion 18 is arranged in the space portion 16a in a horizontal or substantially horizontal posture. The horizontal posture in the structure of the invention includes a substantially horizontal posture. The second exhaust pipe portion 18 is a straight pipe-shaped pipe extending in the front-rear direction of the machine body. In the second exhaust pipe portion 18, the exhaust gas flows in a state where the flow resistance by the second exhaust pipe portion 18 is small. As shown in fig. 4, the second exhaust pipe portion 18 is configured as a double pipe including an inner pipe portion 18a and an outer pipe portion 18b fitted around the inner pipe portion 18 a. The heat insulation effect of the outer pipe portion 18b suppresses the heat of the inner pipe portion 18a due to the heating of the exhaust gas from being transmitted to the surroundings. A gap for improving the heat insulating effect is formed between the inner tube 18a and the outer tube 18 b.

The second exhaust pipe portion 18 is supported by the threshing device 8 through the front and rear portions. Specifically, as shown in fig. 6, the second exhaust pipe portion 18 includes a front connection portion 18f formed at a front portion of the second exhaust pipe portion 18. As shown in fig. 4 and 9, the front connection part 18f and the rear support member 23 located behind the grain-raising device 11 are connected by connection bolts. As shown in fig. 4 and 9, the rear support member 23 extends from the frame portion 8d provided at the upper portion of the side wall 8c of the grain tank side of the thresher 8 toward the grain tank side through the rear of the winnower 11, and supports the rear portion of the winnower 11 at the extended end side portion. The front portion of the second exhaust pipe portion 18 is supported by the threshing device 8 by using a rear support member 23 that supports the winnowing device 11 on the threshing device 8 as a connecting member between the second exhaust pipe portion 18 and the side wall 8c of the threshing device 8.

As shown in fig. 6, the second exhaust pipe portion 18 includes a rear coupling portion 18r formed at a rear portion of the second exhaust pipe portion 18. As shown in fig. 4 and 8, the rear coupling portion 18r and the first support portion 24a provided at the upper portion of the support frame 24 are coupled by coupling bolts. The support frame 24 extends upward from a side wall 8c of the threshing device 8 on the grain tank side. The rear portion of the second exhaust pipe portion 18 is supported by the threshing device 8 via a support frame 24.

As shown in fig. 4, the second exhaust pipe portion 18 has a connecting tube portion 18c formed in a front portion, and is connected to a rear portion of the first exhaust pipe portion 17 through the connecting tube portion 18 c. As shown in fig. 4, the connection cylindrical portion 18c and the rear portion of the first exhaust pipe portion 17 are connected in a state where the connection cylindrical portion 18c is externally fitted to the rear portion of the first exhaust pipe portion 17 and a gap S2 is formed between the inner circumferential portion of the connection cylindrical portion 18c and the outer circumferential portion of the first exhaust pipe portion 17. The exhaust gas is discharged from the first exhaust pipe portion 17 to the connecting tube portion 18c and flows into the second exhaust pipe portion 18. Due to the ejector effect of the flow of the exhaust gas discharged from the first exhaust pipe portion 17 to the connecting cylinder portion 18c, the air outside the exhaust pipe 15 is introduced into the second exhaust pipe portion 18 through the gap S2, the introduced air is mixed with the exhaust gas flowing inside the second exhaust pipe portion 18, and the exhaust gas is cooled by the air. That is, the second cooling portion C2 utilizing the ejector effect is disposed between the first exhaust pipe portion 17 and the second exhaust pipe portion 18.

The third exhaust pipe portion 19 is disposed in the space portion 16b in the front-rear direction. An exhaust port 25 as an exhaust port of the exhaust pipe 15 is formed at the rear of the third exhaust pipe portion 19. As shown in fig. 2, 4, 5, and 6, the air outlet 25 is located at a position corresponding to the rear end of the grain tank 9 in the space portion 16a, and opens rearward at this position. As shown in fig. 2 and 4, the air outlet 25 is located on the front side of the horizontal frame 26 provided on the rear side of the grain box 9. As shown in fig. 3, 4, 5, and 6, the transverse frame 26 is provided in a state of extending in the transverse width direction of the machine body, and connects the side wall 8c of the threshing device 8 on the grain tank side to the stay 28 located on the rear side of the grain tank 9. The support post 28 is provided upright on the body frame 1 at a position adjacent to the first grain discharging device 12A, and supports the first grain discharging device 12A via the holding member 2 that rotatably holds the transport cylinder of the first grain discharging device 12A. The exhaust port 25 does not protrude rearward of the threshing device 8, and grass clippings discharged rearward from the threshing device 8 are less likely to get caught on the rear portion of the exhaust pipe 15.

As shown in fig. 3, 4, and 5, a fuel tank 27 for an engine is provided at the rear of the machine frame 1. The vent 25 is located on the front side of the rear portion of the fuel tank 27 having the fuel supply cylinder 27 a. As shown in fig. 3, 4, 5, and 6, a cover 36 is supported on a base portion of the transverse frame 26 on the thresher side. The cover 36 is located at a position rearward away from the exhaust port 25, and overlaps with a lower portion of the exhaust port 25 in a rear view of the body. When the fuel is supplied to the fuel tank 27, the head or hand of the operator can be prevented from contacting the exhaust pipe 15 by the cover 36 or the like.

The third exhaust pipe portion 19 is supported by the second exhaust pipe portion 18. Specifically, as shown in fig. 4 and 6, the third exhaust pipe portion 19 includes a coupling portion 19a extending forward from a plurality of portions in the circumferential direction of the front portion of the third exhaust pipe portion 19. Each of the plurality of coupling portions 19a is coupled to an outer peripheral portion of the rear end portion of the second exhaust pipe portion 18 by a coupling bolt. The third exhaust pipe portion 19 is supported by the threshing device 8 via the second exhaust pipe portion 18 and the like.

As shown in fig. 4, the third exhaust pipe portion 19 has a connecting tube portion 19b formed in a front portion of the third exhaust pipe portion 19, and is connected to a rear portion of the second exhaust pipe portion 18 via the connecting tube portion 19 b. As shown in fig. 4, the connection between the connection cylindrical portion 19b and the rear portion of the second exhaust pipe portion 18 is performed in a state where the connection cylindrical portion 19b is fitted to the outside of the rear portion of the second exhaust pipe portion 18 and a gap S3 is formed between the inner circumferential portion of the connection cylindrical portion 19b and the outer circumferential portion of the rear portion of the second exhaust pipe portion 18. The exhaust gas is discharged from the second exhaust pipe portion 18 to the connecting tube portion 19b and flows into the third exhaust pipe portion 19. Due to the ejector effect by the flow of the exhaust gas discharged from the second exhaust pipe portion 18 to the connecting cylinder portion 19b, the air outside the exhaust pipe 15 is introduced into the third exhaust pipe portion 19 through the gap S3, the introduced air is mixed with the exhaust gas flowing inside the third exhaust pipe portion 19, and the exhaust gas is cooled by the air.

That is, the third cooling portion C3 utilizing the ejector effect is disposed between the second exhaust pipe portion 18 and the third exhaust pipe portion 19.

After the exhaust gas discharged from the engine 5 is purified by the exhaust gas purifying device 13, the exhaust gas is introduced from the discharge pipe 14 of the exhaust gas purifying device 13 into the introduction cylinder part 22 of the first exhaust pipe part 17 which is an introduction port of the exhaust pipe 15. The exhaust gas introduced into the exhaust duct 15 is cooled by the air introduced from the outside of the exhaust duct 15 in each of the first cooling portion C1, the second cooling portion C2, and the third cooling portion C3, is guided to a portion of the space portion 16a corresponding to the rear end portion of the grain box 9, and is discharged from the exhaust port 25 of the third exhaust duct portion 19 located at the portion as an exhaust port of the exhaust duct 15. The exhaust gas discharged from the exhaust port 25 is guided by the guide member 34 to flow upward. The exhaust gas discharged from the exhaust port 25 is not immediately discharged to the outside of the combine harvester, but passes through the grain tank 9 and the vicinity of the rear end of the thresher 8, is cooled, and is discharged to the outside of the combine harvester.

[ Structure of exhaust pipe cover 30 ]

As shown in fig. 4, 5, 7, and 8, an exhaust duct cover 30 for covering the exhaust duct 15 from the grain tank side is provided between the grain tank 9 and the exhaust duct 15. The exhaust duct cover 30 is provided so as to straddle a position corresponding to the front end of the grain box 9 and a position corresponding to the rear end of the grain box 9. The exhaust pipe cover 30 extends to the rear side of the exhaust port 25 of the exhaust pipe 15. The exhaust pipe cover 30 prevents the exhaust gas discharged from the exhaust port 25 from flowing toward the grain box.

The exhaust pipe cover 30 is supported by the machine body frame 1 and the threshing device 8. Specifically, as shown in fig. 4, 5, and 6, the exhaust pipe cover 30 includes a front cover portion 30F extending forward from the support frame 24 and a rear cover portion 30R extending rearward from the support frame 24. The front portion of the cowl portion 30F is supported by a first support portion 31a of the front pillar 31. The front pillar 31 is erected on the machine frame 1 between the front part of the grain tank 9 and the front part of the threshing device 8. The rear portion of the front cover portion 30F is supported by the second support portion 24b of the support frame 24. The front portion of rear cover 30R is supported by third support portion 24c of support frame 24.

The rear portion of the rear cover 30R is supported by the first support portion 26a of the lateral frame 26.

The lateral frame 26 that supports the second exhaust pipe portion 18 to the support frame 24 and the reinforcement struts 28 of the threshing device 8 is utilized as a member that supports the exhaust pipe cover 30. The exhaust hood 30 is not supported by the grain tank 9. Even if the grain tank 9 swings about the auger axis X of the first grain discharge device 12A as a swing center, and changes from the normal closed position shown by a solid line in fig. 2 to the maintenance open position shown by a two-dot chain line, a release space is formed on the opposite side of the exhaust pipe 15 from the threshing device side, and the exhaust pipe 15 is kept covered by the exhaust pipe cover 30 and is not exposed to the release space.

[ concerning the structure of the work table 32 ]

As shown in fig. 2, a work table 32 is provided above the space 16 between the thresher 8 and the grain tank 9. The work table 32 is positioned above the exhaust pipe 15 and extends in the front-rear direction. The work table 32 is provided so as to straddle a position corresponding to the front end of the threshing device 8 and a position corresponding to the rear end of the grain tank 9.

As shown in fig. 2 and 4, the work table 32 extends to the rear side of the exhaust port 25 of the exhaust pipe 15. As shown in fig. 2, a notch 32c is formed in a portion of the table 32 corresponding to the exhaust port 25 (see fig. 6). In order to enlarge the area of work table 32 and prevent exhaust gas from staying below work table 32, exhaust gas discharged from exhaust pipe 15 is discharged to the upper side of work table 32 through notch 32 c.

As shown in fig. 4 and 6, the work table 32 includes a front table portion 32F extending forward from the front support member 21 and a rear table portion 32R extending rearward from the rear support member 23. As shown in fig. 9, the gap filling member 35 is provided between the frame portion 8d of the side wall 8c of the threshing device 8 and the grain thrower 11 so as to straddle the front support member 21 and the rear support member 23. The support member gap H is filled by the gap filling member 35 so that grass clippings or the like do not enter the support member gap H formed between the front support member 21 and the rear support member 23. The filling of the support member gap H by the gap filling member 35 is performed from the end on the side wall 8c side of the support member gap H to the end on the grain raising device 11 side of the support member gap H. A work table gap is formed between the front work table portion 32F and the rear work table portion 32R of the work table 32, but the work table gap is closed by the gap filling member 35 in a plan view.

The lateral side of the front table part 32F on the threshing device side is supported by a frame part 8d on the side wall 8c of the threshing device 8. As shown in fig. 4, the lateral side portion of the front table portion 32F on the grain tank side is supported by the second support portion 31b provided on the front pillar 31. As shown in fig. 9, the rear portion of the front table portion 32F is supported by a support portion 21a provided on the front support member 21.

As shown in fig. 9, the front portion of the rear table section 32R is supported by a support section 23a provided on the rear support member 23. The rear part of the rear table part 32R is supported by a second support part 26b (see fig. 6) provided on the lateral frame 26. As shown in fig. 8, the intermediate portion of the rear table portion 32R in the front-rear direction is supported by a third support portion 24c provided in the upper portion of the support frame 24. The lateral side portion of the rear table portion 32R on the threshing device side is supported by the frame portion 8d of the side wall 8 c. As shown in fig. 4, the lateral side portion of the rear table portion 32R on the grain tank side is connected to the upper end portion of the exhaust pipe cover 30 via a connecting member 33.

The front support member 21 and the rear support member 23 for supporting the winnowing device 11 on the threshing device 8, the support frame 24 for supporting the second exhaust pipe portion 18 on the threshing device 8, and the lateral frame 26 for supporting the reinforcement post 28 are respectively used as members for supporting the work table 32. The work table 32 is not supported by the grain tank 9, and can change the posture of the grain tank 9 to the open posture.

[ two ]

Next, a second embodiment of the present invention will be described.

In the present embodiment, the structure of a part of the body of the combine harvester, the structure of the exhaust duct 15 and the exhaust duct cover, and the like are different from those of the first embodiment, but the other structures are the same as those of the first embodiment. Therefore, the description of the same configuration as that of one of the first embodiment is omitted, and only the different configuration will be described.

As shown in fig. 10 and 11, in the body of the combine harvester of the present embodiment, the cab 4 is replaced with a ceiling 100 to cover the boarding space of the cab 3. The same components are denoted by the same reference numerals for the other structures of the machine body, and detailed description thereof is omitted.

[ Structure of exhaust pipe ]

The structure of the exhaust pipe 15 will be explained. As shown in fig. 11, the exhaust duct 15 is the same as that of the first embodiment in that it passes rearward through the space 16 between the thresher 8 and the grain tank 9 in a tilted state, and the exhaust port 25 of the exhaust duct 15 opens at a position corresponding to the rear end of the grain tank 9 in the space 16.

In the present embodiment, the exhaust pipe 15 is divided into two parts. That is, as shown in fig. 12 and 13, the exhaust pipe 15 includes: a first exhaust pipe section 101 having an inlet for introducing exhaust gas of the engine 5; and a second exhaust pipe portion 102 connected to a rear portion of the first exhaust pipe portion 101 and having an exhaust port 25 at a rear end.

The first exhaust pipe portion 101 will be explained.

The first exhaust pipe portion 101 includes: a first inclined portion 103 located on the front side and extending in a tilted posture of tilting backward; a first horizontal portion 105 located on the rear side and extending in a horizontal posture; and a first bent portion 104 connecting the first inclined portion 103 and the first horizontal portion 105 in a continuous state. The introduction tube portion 22 formed in the front portion of the first inclined portion 103 is connected to the discharge tube 14 of the exhaust gas purification device 13 in a state where a gap S1 for air introduction is formed.

As shown in fig. 13, the first inclined portion 103 is arranged as a single-layer tube. The first bent portion 104 and the first horizontal portion 105 are configured as a double pipe. That is, similarly to the second exhaust pipe portion 18 according to the first embodiment, the inner pipe portion and the outer pipe portion are integrally connected by welding at both front and rear ends, and the outer pipe portion is configured to have an outer pipe portion with a space (gap) therebetween on the outer peripheral side of the inner pipe portion.

The first exhaust pipe portion 101 is supported by the side wall 8c of the threshing device 8 through the middle portion in the front-rear direction of the first inclined portion 103. As shown in fig. 12 and 14, a plurality of (four) vertical reinforcing frames 106 extending in the vertical direction are provided on the side wall 8c on the grain tank side of the thresher 8 so as to be spaced apart in the front-rear direction. As shown in fig. 14 and 16, a supporting member 107 having a U-shaped cross section is fixed to the front second vertical frame 106b of the four vertical frames 106 so as to protrude toward the grain box side. A bracket 108 having an L-shape in side view is bolted to the support member 107. A coupling member 109 welded and fixed to a front and rear intermediate portion of the first inclined portion 103 and having a substantially U-shape in front view is bolted to an upper surface of the bracket 108.

The first exhaust duct part 101 is supported by the front support member 21 located on the front side of the grain raising device 11 at a position slightly behind the first bent part 104. As shown in fig. 14, a receiving member 110 having an L-shaped cross section extending in the left-right direction is fixed to the front support member 21. A coupling member 111 welded and fixed to a portion slightly behind the first bent portion 104 and having a substantially U-shape in front view is coupled by a bolt in a state of abutting on the lower surface side of the receiving member 110.

Thus, the first exhaust pipe portion 101 is stably supported by the side wall 8c of the threshing device 8 at two locations, front and rear.

The second exhaust pipe portion 102 will be explained.

As shown in fig. 12, 13, and 14, the second exhaust pipe portion 102 includes: a second horizontal portion 112 located on the front side and extending in a horizontal posture; a second inclined portion 114 located on the rear side and extending in a tilted posture of a back tilt; and a second bent portion 113 connecting the second horizontal portion 112 and the second inclined portion 114 in a continuous state. The second horizontal portion 112, the second bent portion 113, and the second inclined portion 114, which are the entire region of the second exhaust pipe portion 102 in the front-rear direction, are all arranged as double pipes (see fig. 13). That is, similarly to the second exhaust pipe portion 18 according to the first embodiment, the inner pipe portion and the outer pipe portion are integrally connected by welding at front and rear end portions, and the outer pipe portion is configured to have an outer pipe portion with a space (gap) therebetween on an outer peripheral side thereof.

The second horizontal portion 112 and the second inclined portion 114 are each formed of a straight pipe, and are disposed as pipes that are continuously connected in a state in which end portions of the straight pipe are obliquely cut and the two are connected by welding to form a second bent portion 113. The second inclined portion 114 extends in a tilted posture tilted backward so as to be positioned upward toward the rear portion side in a side view. As shown in fig. 18, the second inclined portion 114 extends in a state inclined toward the grain box side (right direction) which is a side away from the thresher 8 as it goes toward the rear side in a plan view.

The exhaust port 25 of the second exhaust pipe portion 102 has a rear end of the second inclined portion 114 formed of a straight pipe cut by a cut surface substantially orthogonal to the axial direction, and has a substantially circular opening as viewed in the axial direction. As a result, the exhaust port 25 is arranged to open upward from the horizontal direction. The space on the downstream side in the blowing direction of the exhaust port 25 is open in the blowing direction.

Of the four vertical frames 106a to 106d provided on the side wall 8c on the grain tank side of the threshing device 8, the third vertical frame 106c from the front and the fourth (rearmost) vertical frame 106d from the front are provided with brackets 115 and 116, respectively, in a state of protruding toward the grain tank side. The front and rear brackets 115 and 116 have the same configuration, and include plate bodies each having a vertical surface portion 115a or 116a and a horizontal surface portion 115b or 116b and formed in an L-shape when viewed from the front, and reinforcing ribs 115c and 116c each having a substantially triangular shape when viewed from the front are provided between the vertical surface portion 115a or 116a and the horizontal surface portion 115b or 116 b.

As shown in fig. 17, the front portion of the second horizontal portion 112 is supported by a bracket 115 on the front portion side. The longitudinal surface 115a of the front bracket 115 is bolted to the right side surface of the third front longitudinal frame 106 c. A substantially U-shaped coupling member 117 is welded and fixed to the front portion of the second horizontal portion 112, and is coupled to the horizontal surface portion 115b of the front bracket 115 with a bolt while being supported and placed from above.

The front portion of the second inclined portion 114 is supported by a rear bracket 116. As shown in fig. 12 and 14, the longitudinal surface 116a of the rear bracket 116 is bolted to the right side surface of the fourth front longitudinal frame 106 d. A substantially L-shaped coupling member 118 welded and fixed to the front portion side of the second horizontal portion 112 in a side view is coupled to the horizontal surface portion 116b of the rear bracket 116 by a bolt in a state of being placed and supported from above.

[ concerning side exhaust pipe covers ]

As shown in fig. 12, 13, 15, and 17, a side exhaust duct cover 119, which has the same structure as the exhaust duct cover 30 of the first embodiment and covers the exhaust duct 15 from the grain tank 9 side and is oriented in a plate shape from the top to the bottom, is provided between the grain tank 9 and the exhaust duct 15. The side exhaust pipe cover 119 is divided into a front cover portion 119F and a rear cover portion 119R in the front-rear direction.

One of the first embodiments is configured to: the exhaust pipe cover 30 is supported by the support frame 24 via a bracket (second support portion 24b), and a rear portion of the second exhaust pipe portion 18 is supported by the support frame 24 via a bracket (first support portion 24 a).

In contrast, in the present embodiment, the rear portion of the front cover portion 119F and the front portion of the rear cover portion 119R are supported by the support frame 24 via the brackets (second support portions 24b), respectively, which is similar to the first embodiment, but the second exhaust pipe portion 102 of the present embodiment is supported by the brackets 115 extending from the vertical frames 106c as described above. That is, as shown in fig. 17, a bracket (second support portion 24b) different from the bracket 115 supporting the exhaust pipe 15 is supported by the side wall 8c, and the side exhaust pipe cover 119 is supported by the bracket (second support portion 24 b). By this configuration, generation of vibration, noise, or the like is suppressed. Further, in the rear cover portion 119R, the rear side extending in a cantilever shape is formed to be narrower in width toward the rear side, thereby also suppressing vibration.

[ concerning the upper exhaust pipe cover ]

Is provided with: the upper exhaust pipe cover 120 covers the exhaust port 25 opened at the rear of the exhaust pipe 15.

The upper exhaust pipe cover 120 is coupled to the rear table portion 32R of the table 32.

That is, as shown in fig. 13, 15, and 17, the upper exhaust duct cover 120 is formed by bending a plate material into a substantially U-shape, and includes vertical portions 120A on both left and right sides and an upper cover portion 120B that connects upper portions of the vertical portions 120A to each other. The upper exhaust pipe cover 120 is disposed in a state of protruding upward through a rectangular notch 121 formed at the rear end portion of the rear table portion 32R, and in a state of having the left and right vertical portions 120A along the left and right inner edges of the notch 121, and the left and right vertical portions 120A are connected to the left and right inner edges of the notch 121 by welding. As a result, the upper exhaust pipe cover 120 is disposed in a shape in which the rear end portion protrudes upward from the rear table portion 32R and is raised upward with respect to the rear table portion 32R.

The upper covering portion 120B of the upper exhaust pipe cover 120 is set to a tilted posture tilted backward so as to be substantially parallel to a tilted posture tilted backward of the second tilted portion 114 of the second exhaust pipe portion 102 in a side view. That is, the upper exhaust pipe cover 120 is disposed in an inclined state along the inclination direction of the rear end portion of the exhaust pipe 15. As a result, the rear table portion 32R, the upper exhaust pipe cover 120, and the like are not present in the space on the downstream side in the blowing direction in which the exhaust gas is blown out from the exhaust port 25, and the space is opened in the blowing direction.

The rear end of the upper exhaust pipe cover 120 extends rearward from the rear end of the exhaust port 25.

As shown in fig. 13, it is assumed that: the upper covering portion 120B of the upper exhaust duct cover 120 is provided in a state of protruding rearward from the rear end portion of the exhaust port 25, and the vertical portions 120A on both the left and right sides also extend vertically in a state of being continuous with the end edge of the upper covering portion 120B, covering the region other than the space on the downstream side in the blowing direction and the regions on both the left and right sides in the upper region of the exhaust port 25. By so configuring, rainwater or the like is prevented from entering from the exhaust port 25 that opens upward.

[ Another embodiment of the first embodiment ]

(1) In the above embodiments, the exhaust pipe 15 is configured to pass through the space portion 16a in the space 16, but the present invention is not limited thereto, and may be configured to pass through a space portion above the space portion 16a in the space 16.

(2) In the first embodiment described above, the exhaust pipe 15 in which the gaps S2 and S3 are formed between the first exhaust pipe portion 17 and the second exhaust pipe portion 18 and between the second exhaust pipe portion 18 and the third exhaust pipe portion 19 is used, but the present invention is not limited thereto, and a continuous exhaust pipe in which no gap is formed may be provided.

(3) In the above embodiments, the exhaust duct 15 is not supported by the grain tank 9, but may be supported by the grain tank 9 if the grain tank 9 is configured to be openable and closable.

(4) In the first embodiment, the second exhaust pipe portion 18 is formed as a double pipe, and in the second embodiment, the first exhaust pipe portion 101 and the second exhaust pipe portion 102 are formed as a double pipe.

(5) In the above embodiments, the example in which the work table 32 is provided is shown, but the work table 32 may not be provided. When the work table 32 is provided, the work table is not limited to be separated into the front work table portion 32F and the rear work table portion 32R, and a work table continuous from the front end to the rear end may be used.

(6) In the above embodiments, the example in which the lateral frame 26 is provided is shown, but the lateral frame 26 may not be provided.

(7) In the above embodiments, the example in which the exhaust gas purification device 13 is provided is shown, but the exhaust gas purification device 13 may not be provided.

(8) In the second embodiment described above, the example in which the upper exhaust pipe cover 120 is coupled to the table 32 (rear table part 32R) is shown, but the upper exhaust pipe cover 120 may be supported by a support member different from the table 32.

(9) In the second embodiment described above, the upper exhaust pipe cover 120 is disposed in a shape in which the rear end portion protrudes upward from the work table 32 and is raised upward from the work table 32, but the upper exhaust pipe cover 120 may be provided at a vertical position in the same manner as the work table 32.

(10) In the second embodiment described above, the rear end portion of the exhaust pipe 15, that is, the second inclined portion 114 of the second exhaust pipe portion 102 is provided in a state of being inclined rearward and upward, but the following configuration may be adopted instead of this configuration.

For example, the rear end portion of the exhaust pipe 15 may be formed of a straight pipe extending in a horizontal posture and the exhaust port 25 may be formed so that the upper side portion thereof opens upward, or the rear end portion of the exhaust pipe 15 may be formed of a straight pipe extending in a vertical posture and the exhaust port 25 may be formed so that the upper end portion thereof opens upward.

(11) The invention can be applied to a semi-feeding type combine harvester besides a full-feeding type combine harvester.

[ second embodiment ]

Hereinafter, an embodiment of the all-feed combine harvester of the present invention will be described with reference to the drawings.

[ integral Structure ]

Fig. 19 and 20 show a full-feed combine harvester for harvesting rice, wheat, soybean, and other crops. In the present embodiment, when the front-rear direction of the travel machine body of the combine harvester is defined, the travel direction of the machine body in the working state is defined, and when the left-right direction of the machine body is defined, the left-right direction is defined as viewed in the travel direction of the machine body. That is, the direction indicated by reference numeral (F) in fig. 19 and 20 is the front side of the machine body, and the direction indicated by reference numeral (B) in fig. 19 and 20 is the rear side of the machine body. The direction indicated by reference numeral (L) in fig. 20 is the left side of the body, and the direction indicated by reference numeral (R) in fig. 20 is the right side of the body. Therefore, the body left-right direction corresponds to the traveling body lateral width direction.

A pair of right and left crawler traveling devices 202 is provided at a lower portion of a body frame 201 of the traveling body. A harvesting part 203 for harvesting a crop to be harvested and conveying the crop to the rear is provided on the front side of the traveling machine body. Further, the body frame 201 includes: a threshing device 204 that threshes the harvested grain stalks transported from the harvesting unit 203 and sorts the threshed products obtained by the threshing process into grains and discharge, a grain tank 205 that stores the grains obtained by the threshing device 204, a grain discharge device 206 that discharges the grains stored in the grain tank 205 to the outside of the machine, a cab-equipped cab unit 207 on which an operator rides to perform a driving operation, and the like. The combine harvester is configured as a whole straw feeding type that cuts off roots of planted straw for harvesting and feeds the harvested straw all to the threshing device 204.

The driving part 207 is positioned at the right side of the front part of the machine body, and the grain box 205 is positioned at the rear part of the driving part 207.

Further, in a state where the threshing device 204 is positioned on the left side and the grain tank 205 is positioned on the right side, the threshing device 204 and the grain tank 205 are provided side by side in the left-right direction. An engine 208 for driving is provided below the driver 207. The threshing device 204 has a threshing cylinder 209 that is rotationally driven around an axis in the front-rear direction of the machine body, and is configured as an axial flow type threshing device that conveys harvested cereal stalks conveyed to the front of the threshing device 204 to the rear of the machine body and performs threshing processing by the threshing cylinder 209. As shown in fig. 23, the threshing cylinder 209 is rotationally driven clockwise (in the right-handed direction) when viewed from the front.

As shown in fig. 23, power from the engine 208 is transmitted to a transverse drive shaft 232 in a transmission case 231 located in the front part of the threshing cylinder 209 via a transmission belt 230, and power is transmitted from the transverse drive shaft 232 to the threshing cylinder 209 via a bevel gear mechanism (not shown) in a bevel gear box 233.

The harvesting unit 203 includes a harvesting unit 210 provided at a front portion thereof, and a feeder 211 connected to a rear portion of the harvesting unit 210 and serving as a straw conveying device for conveying the whole straw of the harvested straw harvested by the harvesting unit 210 to the rear. The harvesting section 210 harvests the planted straw as a harvesting target, and conveys the harvested straw transversely to the middle part of the transverse width of the machine body to cause the harvested straw to merge. The feeder 211 conveys the crop merged at the harvesting unit 210 backward toward the threshing device 204. The hydraulic cylinder 212 for lifting and lowering, which is provided so as to straddle the body frame 201 and the feeder 211, extends and contracts, and thereby the harvesting unit 203 including the harvesting unit 210 and the feeder 211 is supported so as to be vertically swingable about the horizontal axis P1 between a lifting position and a lowering position.

The harvesting unit 210 is supported by a harvesting frame 213 formed by connecting corner pipes, corner fittings having an L-shaped cross section, and the like, and includes: a pair of left and right dividers 214 provided at the foremost end of the traveling machine body; a raking reel 215 located behind and above the crop divider 214; a harvesting knife 216 located behind the crop divider 214; and a lateral conveying screw 217 between the harvesting knife 216 and the feeder 211.

The crop divider 214 divides the standing grain stalks as the harvesting objects from the standing grain stalks as the non-harvesting objects. The raking reel 215 rakes the planted vertical straw as a harvesting object rearward. The harvesting knife 216 is a member for cutting the root side of the standing grain stalks raked rearward by the raking reel 215 and to be harvested, and is disposed, for example, in a pusher type. The horizontal conveying screw 217 horizontally conveys and gathers the harvested stalks cut by the harvesting knife 216 to the middle side in the left-right direction, and sends out the harvested stalks toward the rear feeder 211.

As shown in fig. 27, a conveying guide rod 234 is provided at a harvesting width direction inner side portion of the right-side crop divider 214, and the conveying guide rod 234 guides a root side portion of the standing straw located at the right-side end portion of the standing straw to be harvested among the standing straw to be harvested divided by the crop divider 214 to a position close to the harvesting width direction inner side. With this arrangement, the upper portion Q of the right end of the harvesting knife 216 is opened, and the driver who performs the steering operation in the driver unit 207 can visually confirm the position of the harvesting knife 216.

[ feeder ]

The feeder 211 will be explained.

As shown in fig. 21, the feeder 211 is provided with a feeding box 218 as a conveying box formed in a rectangular tube shape. A drive shaft 219 serving as a lateral downstream rotation shaft to which power is transmitted from the engine 208 via a relay shaft, not shown, and is rotationally driven is provided at a conveyance downstream side portion in the feed box 218. As shown in fig. 22 and 23, a support cylinder 220 that rotatably supports the drive shaft 219 is rotatably supported on the front wall of the threshing device 204 via a pair of left and right fulcrum brackets 221 so as to be rotatable about a horizontal axis P1. Is configured to: the left and right side walls 218A of the feed box 218 are integrally connected to the support cylinder 220, and the entire feeder 211 including the harvesting unit 210 is supported by the front wall of the threshing device 204 so as to be vertically swingable about the horizontal axis P1.

The drive shaft 219 is formed in a hexagonal shape in cross section. A pair of left and right drive sprockets 222 serving as downstream-side wheel bodies provided with hexagonal fitting holes into which the hexagonal cross-sectional shapes are fitted to the drive shaft 219 so as to be integrally rotatable and externally fitted with a space in the axial direction. The drive shaft 219 projects outward on one lateral side of the feed box 218, and transmits power from the engine 208 to the projecting portion.

A driven shaft 224 as a horizontal upstream rotary shaft is supported so as to be rotatable around a horizontal shaft center in the feed box 218 on the front end side of the machine body. A cylindrical driven wheel body 225 as an upstream side wheel body that can rotate integrally is provided on the driven shaft 224. A pair of left and right endless rotating chains 226 is wound and stretched so as to straddle the pair of left and right drive sprockets 222 and the driven wheel body 225. Further, a plurality of conveying members 227 are transversely bridged and connected across the pair of left and right endless rotating chains 226 at predetermined intervals. A pair of left and right flange portions 228 for preventing lateral displacement of the pair of left and right endless rotating chains 226 are integrally provided on the outer peripheral portion of the driven wheel body 225.

The pair of endless rotating chains 226 are integrally rotated in the same direction by transmitting power to the drive shaft 219, and the crop supplied from the harvesting unit 210 is caught and conveyed by the conveying member 227 between the moving path below the endless rotating chains 226 and the bottom surface portion 218B in the feed box 218, and is supplied to the threshing device 204. As shown in fig. 23, a grain and straw carrying-in port 235 is formed at a position corresponding to the lower portion of the threshing cylinder 209 when the front portion of the threshing device 204 is viewed from the front. The feeder 211 is connected to the straw transport inlet 235 to feed the transported harvested straw.

As shown in fig. 20, the harvesting unit 210 has a harvesting width wider than the lateral width of the feeder 211, and is connected to the feeder 211 in a state of being offset to one side (right side) in the harvesting width direction with respect to the feeder 211. As described above, the threshing cylinder 209 is rotationally driven clockwise (in the right-hand direction) when viewed from the front. Therefore, the harvesting unit 210 is connected to the feeder 211 in a state of being offset to the feeder 211 on the side corresponding to the downstream side of the grain-straw conveying port 235 in the rotation direction of the threshing cylinder 209 in a front view.

As shown in fig. 23, the power from the engine 208 is transmitted to the drive shaft 219 as a positive rotational force via a relay shaft and an input pulley 237, which are not shown. Further, the reverse power transmitted through the not-shown bevel gear mechanism in the bevel gear box 233 is transmitted to the drive shaft 219 via the reverse rotation drive shaft 238 and the reverse rotation clutch 239 for a short time. When the reverse power is transmitted, the feeder 211 performs a reverse operation of reverse rotation. The reverse action is used when a transport jam occurs or the like.

As shown in fig. 25 and 26, the endless rotating chain 226 is basically configured as: the outer links 241, which are located on the outer side on both sides in the width direction, and the inner links 242, which are located on the inner side, are alternately connected in a vertically aligned state while being pivotally supported and connected by the plurality of connecting pins 240.

The sleeve 243 and the roller 244 are fitted around the coupling pin 240 to form a pin portion 245. The pin 245 is engaged in a recess 222A of a drive sprocket 222, which will be described later, and the rotational drive force of the drive sprocket 222 is transmitted to the endless rotating chain 226 and rotationally operated in the direction of the arrow in fig. 26.

In the endless revolving chain 226, many path portions in the path in the longitudinal direction are constituted by the outer link 241 and the inner link 242 described above, but an offset link 246 may be used in a partial region in the middle (see fig. 25). The offset link 246 is a link that is bent and deformed so that one end side is located at the same position as the outer link 241 and the other end side is located at the same position as the inner link 242, and by using the offset link 246, the length adjustment of the endless rotating chain 226 can be performed. That is, even if the offset link 246 is removed, two adjacent links can be directly connected to each other, and the connection between the outer link 241 and the inner link 242 can be released and the offset link 246 can be fitted therebetween, so that the length of the endless rotating chain 226 can be adjusted. The offset link 246 and the links adjacent thereto may be configured to be releasable from each other by using a bolt 247 (see fig. 25) instead of the coupling pin 240 or by using a structure (not shown) for preventing the inserted pin from coming off.

The driving sprocket 222 will be explained.

As shown in fig. 26, the drive sprocket 222 is configured to: a plurality of teeth 222B (engaging projections) are provided in the circumferential direction, and the pin portions 245 of the endless rotating chain 226 can be engaged with the recesses 222A between adjacent teeth 222B. The recess 222A includes a bottom portion 222C that spans between a side portion of the tooth 222B located on one side in the circumferential direction and a side portion of the tooth 222B located on the other side in the circumferential direction among the adjacent teeth 222B. The bottom portion 222C is formed in a flat shape in the circumferential direction, and the other side portion and the one side portion are formed in a curved shape along the outer contour of the pin portion 245 of the endless turning chain 226.

The circumferential width of the bottom portion 222C is formed larger than the outer diameter of the pin portion 245. Specifically, it has a width larger than twice the outer diameter dimension of the pin portion 245. Therefore, the pin portion 245 of the endless rotating chain 226 caught in the recess 222A can be located at any position in the circumferential width range of the bottom portion 222C in the recess 222A. As a result, even if the pin 245 of the endless rotating chain 226 is caught in the recess 222A of the drive sprocket 222 in a state where the harvested straw is fitted in the recess 222A, the pin 245 can be moved in the circumferential direction to remove the harvested straw, and a trouble that the pin is caught on the harvested straw and is disengaged from the endless rotating chain 226 can be avoided.

[ antiwind cover ]

As shown in fig. 22, a tubular anti-wind cover 229 that straddles the pair of drive sprockets 222 in a state of covering the outer peripheral side of the drive shaft 219 is provided on the lateral intermediate side of each of the pair of drive sprockets 222 of the drive shaft 219.

The anti-wind cover 229 is formed of two divided covers 229A and 229B divided in the axial direction of the drive shaft 219, and an end of the right divided cover 229A on one side of the two divided covers 229A and 229B is inserted and connected to an end of the left divided cover 229B on the other side in an embedded and overlapped state.

Both the divided covers 229A and 229B are formed of a cylindrical metal plate, and as shown in fig. 22, the right divided cover 229A is arranged in a cylindrical shape having the same outer diameter over the entire width in the axial direction. The right portion of the left divided cover 229B is formed to have a slightly larger diameter than the right divided cover 229A so as to be fitted around the outer periphery of the right divided cover 229A. The left divided cover 229B has a constricted portion 250 formed at a position on the left side (an example of the other side in the left-right direction) of the left divided cover 229B with respect to the center position CL1 in the left-right direction, the constricted portion deforming the diameter of the left end portion to a small diameter. The left end of the left divided cover 229B has the same outer diameter as the right divided cover 229A.

The anti-wind covers 229 are supported by the left and right drive sprockets 222 in an insertion-attached state. That is, a circumferential groove 251 having substantially the same shape as the shape of the entanglement preventing cover 229 and recessed over the entire circumference is formed on the inner side surface in the left-right direction of each of the left and right drive sprockets 222. The anti-wind cover 229 is provided in a state where a right end is fitted into the circumferential groove 251 formed in the right drive sprocket 222 and a left end is fitted into the circumferential groove 251 formed in the left drive sprocket 222.

The anti-wind cover 229 is provided in a state where the left divided cover 229B is located on the upstream side in the rotation direction of the threshing cylinder 209 and the right divided cover 229A is located on the downstream side in the rotation direction of the threshing cylinder 209 when viewed from the front. The overlapping portion 252 where the right divided cover 229A overlaps the left divided cover 229B is located upstream of the right and left center positions CL2 between the right and left drive sprockets 222 in the rotation direction of the threshing cylinder 209.

As shown in fig. 23, the threshing cylinder 209 is rotationally driven clockwise (in the right-handed direction) when viewed from the front. A straw inlet 235 for conveying the harvested straw conveyed by the feeder 211 toward the threshing device 204 is formed in a front wall of the threshing device 204 at a position corresponding to a lower portion of the threshing cylinder 209. The lower portion of the threshing cylinder 209 opposed to the straw carrying-in port 235 rotates from the left side to the right side (in fig. 23, from the right side to the left side in the drawing). Therefore, in the present embodiment, the left side of the machine body corresponds to the upstream side in the rotation direction of the threshing cylinder 209, and the right side of the machine body corresponds to the downstream side in the rotation direction of the threshing cylinder 209. The overlapping portion 252 is located on the left side of the left and right center positions CL2 between the left and right drive sprockets 222, and is therefore located on the upstream side in the rotation direction of the threshing cylinder 209.

As shown in fig. 22, the right divided cover 229A and the left divided cover 229B are radially connected to each other at a position on the upstream side in the rotation direction of the threshing cylinder 209 in the overlapping portion 252 where the right divided cover 229A and the left divided cover 229B overlap each other. The overlapping portion 252 is provided with a fastening piece 253 that penetrates the right divided cover 229A and the left divided cover 229B in the radial direction and is fixed thereto. As shown in fig. 22, the fastening piece 253 is located on the left side (upstream side in the rotation direction of the threshing cylinder 209 of the straw conveying inlet 235) of the left and right center positions of the overlapping portion 252 in the front view.

The fastener 253 includes a bolt 254 and a nut 255, and is provided in plurality (three or four or so) at intervals in the circumferential direction of the anti-wind cover 229. The nut 255 is welded and fixed to the inner surface of the right divided cover 229A located inside the overlapping portion 252 in advance. Bolt insertion holes penetrating the right divided cover 229A and the left divided cover 229C in the radial direction are formed at the portions to which the nuts 255 are attached. As shown in fig. 22, the fastener 253 (bolt 254, nut 255) is provided on the overlapping portion 252 on the left side, i.e., on the upstream side in the rotation direction of the threshing cylinder 209.

When the drive sprocket 22229 and the left and right members 2 of the anti-wind cover are assembled to the outer peripheral portion of the drive shaft 219, they can be assembled in the following order.

First, the drive shaft 219 is attached so as to be inserted through the support cylindrical portions 220 on the left and right sides. In this case, the left and right drive sprockets 222 and the anti-wind covers 229 are disposed between the left and right support tube portions 220 so as to be positioned outside the drive shaft 219. At this time, the left and right divided covers 229A and 229B are not connected and can slide.

One of the left and right drive sprockets 222 is disposed close to the corresponding support cylindrical portion 220, and is fixed to the drive shaft 219 by a bolt 256. At this time, as shown in fig. 24, the left and right divided covers 229A and 229B are in a state of being deeply overlapped with each other, and the outer side of one of the drive sprockets 222 is opened, so that the fixing operation of the drive sprocket 222 by the bolt 256 can be easily performed. Next, the left and right divided covers 229A and 229B are brought close to the drive sprocket 222 whose position in the axial direction is fixed after the assembly is completed, and the outside of the drive sprocket 222 on the opposite side is opened and fixed by the bolt 256.

A circumferential groove 257 into which an end portion of the support cylinder portion 220 can enter is formed in a lateral outer side surface of the drive sprocket 222 in the left-right direction. The end of the support cylinder portion 220 is provided in a state of entering the outer peripheral groove 257, whereby grass clippings are prevented from entering the gap between the drive sprocket 222 and the drive shaft 219 by the labyrinth structure.

The method comprises the following steps: after the left and right drive sprockets 222 are fixed in this manner, the left and right divided covers 229A and 229B are pulled in the axial direction, and both end portions are fitted into the circumferential grooves 251 formed on the left and right inner sides of the left and right drive sprockets 222. The left and right divided covers 229A and 229B are pulled to predetermined positions, and the bolts 254 are attached from the outside and fastened to the nuts 255 in a state where the bolt insertion holes formed in the right divided cover 229A and the left divided cover 229B are overlapped with each other, thereby fixing the left and right divided covers 229A and 229B (see fig. 22).

[ Another embodiment of the second embodiment ]

(1) In the above embodiment, the overlapping portion 252 is located at a position shifted to the left side (the upstream side in the rotation direction of the threshing cylinder 209 of the straw carrying-in port 235) from the left-right center position CL2 between the left and right drive sprockets 222 in the front view, but instead, the overlapping portion 252 may be located at a position shifted to the left side from the left-right center position or the left-right center position CL 2.

(2) In the above embodiment, the fastening piece 253 is located at a position shifted to the left side (upstream side in the rotation direction of the threshing cylinder 209 of the straw carrying inlet 235) from the left and right center positions of the overlapping portion 252 in a front view, but instead, the fastening piece 253 may be provided at a position shifted to the right side from the vicinity of the left and right center positions or the left and right center positions. Instead of the fastener 253, a structure in which the two divided covers 229A and 229B are connected by an adhesive may be employed, and various connection structures may be employed.

(3) In the above embodiment, the right end portion of the right divided cover 229A and the left end portion of the left divided cover 229B have the same outer diameter, and the right end portion of the left divided cover 229B has an outer diameter larger than the outer diameter of the left end portion, and the constricted portion 250 is formed to deform the left end portion to a small diameter.

However, in this case, the peripheral grooves 251 of the left and right drive sprockets 222 have different diameters.

(4) According to the configuration described in the above embodiment, when the left and right drive sprockets 222 are attached to the drive shaft 219, the operator positions the position in the axial direction at an arbitrary position and fixes the position to the drive shaft 219 with the bolt 256. In this configuration, if the alignment is not performed accurately, the drive sprocket 222 may come into contact with the support cylindrical portion 220, or a gap may be formed between the drive sprocket 222 and the support cylindrical portion 220, and grass clippings or other dust may enter through the gap to adversely affect the rotation of the drive shaft 219.

Therefore, in order to align the positions of the left and right drive sprockets 222 in the axial direction to the correct positions without complicating the operation, the following arrangement is possible.

Namely, the configuration is provided with: an abutment member S located at one end in the axial direction of the drive sprocket 222 and fixed in position in the axial direction; a first tubular member T1 provided between the one of the left and right drive sprockets 222 and the abutment member S, and having a length corresponding to the distance between the two; a second tubular member T2 provided between the drive sprocket 222 on the one side and the drive sprocket 222 on the other side, and having a length corresponding to the interval therebetween; and a fixing member K capable of fixing the position of the other drive sprocket 222 in the axial direction.

Hereinafter, a specific structure will be described.

As shown in fig. 28, both lateral (axial) end portions of the drive shaft 219 are rotatably supported by the left and right support cylindrical portions 220 via bearings 270. As shown in fig. 29 and 30, the left and right bearings 270 are restricted in position by the anti-slip ring 271 on the left and right outer sides, and the drive shaft 219 is restricted in position in the left and right direction by the left and right bearings 270.

Although the explanation is omitted in the above embodiment, the left and right drive sprockets 222 include: a base end portion 222D located radially inside and externally fitted to the drive shaft 219 in such a manner as to be rotatable integrally with the drive shaft 219; and a wheel body main portion 222E located radially outward of the base end portion 222D, having teeth (engagement projections) 222B on an outer circumferential portion thereof as winding portions around which the endless rotating chain 226 is wound, and the base end portion 222D is formed wider in the axial direction than the wheel body main portion 222E in a state where it has a protruding cylindrical portion 272 protruding in the axial direction than the wheel body main portion 222E.

As shown in fig. 31, a flat surface 219A is provided on the outer peripheral surface of a drive shaft 219 formed in a hexagonal cross section. A screw hole 273 extending in the radial direction is formed in the protruding cylindrical portion 272 of the base end portion 222D at a position facing the flat surface portion 219A, and the bolt 256 is attached to the screw hole 273. The tip end of the bolt 256 is formed as a flat surface, is arranged to abut against the flat surface 219A in a surface abutting state, and regulates the position in the axial direction by friction

As shown in fig. 29 and 30, the present invention further includes: left and right annular receiving tools 274 which are positioned and fixed in the axial direction while abutting against the inner rings 270a of the left and right bearings 270 on the left and right inner sides; a left tubular member 275 provided between the left receiver 274 and the left drive sprocket 222 and having a length corresponding to the distance between the two; an intermediate side tube member 276 provided between the left drive sprocket 222 and the right drive sprocket 222 and having a length corresponding to the distance between the two; and a right cylindrical member 277 provided between the right drive sprocket 222 and the right receiving tool 274 and having a length corresponding to the distance between the two members. The cylindrical members 275, 276, 277 are cylindrical and are fitted to the outside to be in contact with the outer end of the drive shaft 219.

In such a configuration, for example, in the case where the drive shaft 219 is attached to the left and right support cylinder parts 220 from the left outside, the bearing 270 is attached to the right support cylinder part 220, and the right receiving tool 274, the right cylindrical member 277, the right drive sprocket 222, the intermediate side cylindrical member 276, the left drive sprocket 222, the left cylindrical member 275, the left receiving tool 274, and the left bearing 270 are attached in order to abut against each other. The above members abut against each other, whereby the positions of the left and right drive sprockets 222 in the axial direction are automatically determined. Note that the anti-wind cover 229 is attached as well.

In this case, the right holder 274 corresponds to the abutment member S, the right barrel member 277 corresponds to the first barrel member T1, the middle barrel member 276 corresponds to the second barrel member T2, and the left barrel member 275 and the left holder 274 correspond to the fixed member K. In the case where the drive shaft 219 is attached to the left and right support tube portions 220 from the right outer side, the left receiver 274 corresponds to the abutment member S, the left tube member 275 corresponds to the first tube member T1, the middle tube member 276 corresponds to the second tube member T2, and the right tube member 277 and the right receiver 274 correspond to the fixing member K.

(5) In the embodiment described in (4) above, the left side tube member 275 and the left side receiving jig 274 correspond to the fixing member K, or the right side tube member 277 and the right side receiving jig 274 correspond to the fixing member K, but the present invention is not limited to this configuration, and the fixing member K may be configured such that, for example, the base end portion 222D of the drive sprocket 222 is extended to the opposite side from the protruding tube portion 272 and directly abuts against the inner ring 270a of the bearing 270 to fix the position, and the key point is that the other downstream side wheel body (drive sprocket) can be fixed in position in the axial direction.

(6) The present invention can be applied to a combine harvester having a straw conveying device for conveying the whole straw of the harvested straw harvested by a harvesting unit to the rear.

[ third embodiment ]

Hereinafter, an embodiment of the all-feed combine harvester of the present invention will be described with reference to the drawings.

[ integral Structure ]

Fig. 32 and 33 show a full-feed combine harvester for harvesting crops such as rice, wheat, and soybean. In the present embodiment, when the front-rear direction of the travel machine body of the combine harvester is defined, the travel direction of the machine body in the working state is defined, and when the left-right direction of the machine body is defined, the left-right direction is defined as viewed in the travel direction of the machine body. That is, the direction indicated by reference numeral (F) in fig. 32 and 33 is the front side of the machine body, and the direction indicated by reference numeral (B) in fig. 32 and 33 is the rear side of the machine body. The direction indicated by reference numeral (L) in fig. 33 is the left side of the body, and the direction indicated by reference numeral (R) in fig. 33 is the right side of the body. Therefore, the body left-right direction corresponds to the traveling body lateral width direction.

A pair of right and left crawler traveling devices 302 is provided at a lower portion of a body frame 301 of the traveling body. A harvesting part 303 for harvesting and conveying a crop to be harvested is provided on the front side of the traveling machine body. Further, the body frame 301 is provided with: a threshing device 304 that threshes harvested grain stalks as crops conveyed from the harvesting unit 303 and sorts the threshed products obtained by the threshing processing into grains and discharge, a grain tank 305 that stores the grains obtained by the threshing device 304, a grain discharge device 306 that discharges the grains stored in the grain tank 305 to the outside of the machine, a cab-equipped cab 307 that allows an operator to ride thereon for driving, and the like. The combine harvester is configured as a full-feed type that cuts the roots of the planted straw for harvesting and feeds the harvested whole straw of the harvested straw to the threshing device 304.

The steering part 307 is located on the right side of the front part of the machine body, and the grain box 305 is located behind the steering part 307.

The threshing device 304 and the grain tank 305 are arranged side by side in the left-right direction in a state where the threshing device 304 is positioned on the left side and the grain tank 305 is positioned on the right side. An engine 308 for driving is provided below the driver 307.

The harvesting unit 303 includes a harvesting unit 310 provided at the front portion and a feeder 311 as a straw conveying device connected to the rear portion of the harvesting unit 310 and configured to convey the whole straw of the harvested straw harvested by the harvesting unit 310 to the rear. The harvesting section 310 harvests the standing straw of the crop to be harvested, and conveys the harvested crop (harvested straw) laterally to the middle of the lateral width of the machine body to merge them. The feeder 311 conveys the crop merged at the harvesting unit 310 backward toward the threshing device 304. The hydraulic cylinder 312 for lifting and lowering, which is disposed across the body frame 301 and the feeder 311, extends and contracts, and thereby the harvesting unit 303 including the harvesting unit 310 and the feeder 311 is supported so as to be vertically swingable about the horizontal axis P1 between a lifting position and a lowering position.

The harvesting unit 310 is supported by a harvesting frame 313 formed by connecting corner pipes, corner fittings having an L-shaped cross section, and the like, and includes: a pair of left and right dividers 314 provided at the foremost end of the traveling machine body; a raking reel 315 located behind and above the crop divider 314; a harvesting knife 316 positioned behind the crop divider 314; and a lateral conveying screw 317 between the harvesting knife 316 and the feeder 311.

The crop divider 314 divides the standing grain stalks as the harvesting objects from the standing grain stalks as the non-harvesting objects. The raking reel 315 rakes the planted vertical straw as a harvesting object rearward. The harvesting knife 316 is a member for cutting the root side of the standing grain stalks raked rearward by the raking reel 315 to be harvested, and is disposed, for example, in a pusher type. The horizontal conveying screw 317 conveys and gathers the harvested stalks cut by the harvesting knife 316 horizontally to the middle side in the left-right direction, and sends out the harvested stalks toward the rear.

[ feeder ]

The feeder 311 will be explained.

As shown in fig. 34, the feeder 311 is provided with a feeding box 318 as a conveying box formed in a rectangular tube shape. A drive shaft 319 as a lateral downstream rotation shaft to which power from the motor 308 is transmitted and which is rotationally driven is provided at a conveyance downstream side portion in the feed box 318. Although not shown, a support cylinder portion that rotatably supports the drive shaft 319 is supported rotatably about a lateral axis P1 on the front wall portion of the threshing device 304 via a pair of left and right fulcrum brackets. Is configured to: the left and right side walls 318A of the feeding box 318 are integrally connected to the support cylinder portion, and the entire feeder 311 including the harvesting portion 310 is supported by the front wall portion of the threshing device 304 so as to be vertically swingable about the horizontal axis P1.

The section of the driving shaft 319 is formed in a hexagonal shape. A pair of left and right drive sprockets 322 as downstream-side wheel bodies having hexagonal fitting holes fitted to the hexagonal cross-sectional shapes are externally fitted to the drive shaft 319 so as to be integrally rotatable with a space therebetween in the axial direction. The power from the engine 308 is transmitted to the drive shaft 319 via a transmission mechanism not shown.

A driven shaft 324 as a horizontal upstream-side rotating shaft is supported so as to be rotatable around a horizontal shaft center on the front end side of the machine body in the feed box 318. A cylindrical driven wheel body 325 as an upstream side wheel body that can rotate integrally is provided on the driven shaft 324. A pair of left and right endless rotating chains 326 is wound and stretched so as to straddle the pair of left and right drive sprockets 322 and the driven wheel body 325. Further, a plurality of conveying members 327 are transversely bridged and connected across a pair of left and right endless rotating chains 326 at a predetermined interval. A pair of left and right flange portions 328 (see fig. 35) for preventing lateral displacement of the pair of left and right endless rotating chains 326 are integrally provided on the outer peripheral portion of the driven wheel body 325.

The pair of endless rotating chains 326 are integrally rotated in the same direction by transmitting power to the driving shaft 319, and the crop supplied from the harvesting unit 310 is caught and conveyed by the conveying member 327 between the moving path below the endless rotating chains 326 and the bottom surface portion 318B in the feeding box 318, and is supplied to the threshing device 304.

Next, the structure around the drive shaft 319 of the feeder 311 will be described.

As shown in fig. 34, a cylindrical anti-wind cover 329 supported so as to straddle the pair of drive sprockets 322 in a state of being externally fitted to the drive shaft 319 is provided at a portion of the drive shaft 319 adjacent to the lateral middle side of each of the pair of drive sprockets 322. Although not shown, the anti-wind cover 329 is provided in a state of being fitted into a circumferential groove formed in each of the left and right inner side surfaces of the left and right drive sprockets 322.

[ Hydraulic cylinder ]

As shown in fig. 32, the hydraulic cylinder 312 is connected so as to straddle between the bottom surface 318B of the feed box 318 and the front portion of the body frame 301. The hydraulic cylinder 312 has a substantially cylindrical cylinder 312a and a piston rod 312b, and the piston rod 312b extends and contracts relative to the cylinder 312a, whereby the entire harvesting unit 303 including the feeder 311 and the harvesting unit 310 can be swung up and down.

In order to support the reaping portion 303 with good balance by the body transverse width direction intermediate portion, as shown in fig. 42, the hydraulic cylinder 312 is disposed at a position close to the body transverse width intermediate portion. As shown in fig. 41, the base end portion of the cylinder 312a is rotatably coupled to the bracket 330 of the body frame 301 about the horizontal axis, and the tip end portion of the piston rod 312B is pivotally supported by the bracket 331 coupled to the bottom surface portion 318B side of the feed tank 318 via a coupling pin 332 so as to be rotatable relative to the feed tank 318.

A lowering restriction unit 333 is provided on the bottom surface 318B of the feed box 318 so as to be vertically swingable, and the lowering restriction unit 333 restricts the contraction of the hydraulic cylinder 312 and the lowering of the harvesting unit 303 when the hydraulic cylinder 312 is in the extended state. The lowering restriction unit 333 is provided in the bottom portion 318B near the middle of the lateral width of the machine body, corresponding to the hydraulic cylinder 312.

The cross-sectional shape of the descent limiting portion 333 is formed into a substantially U-shape that opens downward when viewed in the front-rear direction. The descent control portion 333 is supported by the connecting pin 332 so as to be swingable around the horizontal axis core. As shown by the solid line in fig. 41, in the extended state in which the piston rod 312b of the hydraulic cylinder 312 is extended, the descent control unit 333 is operated to descend so as to cover the piston rod 312b with the U-shaped opening, and the movable end of the descent control unit 333 comes into contact with the one end 312a1 of the cylinder tube 312 a. Accordingly, the thrust force of the descent control portion 333 acts on the bottom surface portion 318B and the one end portion of the cylinder 312a, and the usage state is achieved. On the other hand, as shown by the broken line in fig. 41, the lowering restriction unit 333 is placed along the bottom surface 318B by the raising operation, and is thereby placed in the non-use state. In this manner, the lowering restriction unit 333 is arranged to be able to change the posture to the use state and the non-use state by swinging up and down.

The lock mechanism 334 is provided to hold and release the position of the descent control unit 333 in an inactive state. As shown in fig. 41 and 42, the lock mechanism 334 includes: a substantially U-shaped bracket 335 fixed to the bottom surface portion 318B of the feed box 318; an L-shaped connecting pin 336 inserted through the bracket 335 in the left-right direction; a coil spring 337 externally inserted to the coupling pin 336 inside the bracket 335; and a latch pin 338 insertedly attached to the coupling pin 336 to limit the amount of slippage. The lowering restriction portion 333 is provided with a locking member 340, and an engagement hole 339 with which the connection pin 336 can be engaged is formed in the locking member 340.

The connecting pin 336 is moved and biased so as to engage with the locking member 340 by the biasing force of the coil spring 337. When the descent regulating portion 333 is in the inactive state, the coupling pin 336 engages with the engagement hole 339 of the locking member 340 by the biasing force of the coil spring 337, and the descent regulating portion 333 is held in position. When the coupling pin 336 is slid to release the engagement with the locking capsule 340, the descent control portion 333 can be switched to the operating state. The lock mechanism 334 can reliably hold the position of the descent limiting portion 333 in the inactive state, and can easily perform the switching operation.

[ position adjustment structure of driven shaft ]

Next, a position adjustment structure of the driven shaft 324 will be described.

As shown in fig. 35, the feeder 311 is provided with: a rotary shaft support 341 that supports the driven shaft 324 so as to be rotatable about the axial center of the driven shaft 324, and is supported by the feed box 318 so as to be changeable in position in the conveying direction; and a position adjustment mechanism 342 capable of changing the position of the rotary shaft support 341 in the conveyance direction and fixing the same at the changed position.

As shown in fig. 35, both end portions of the driven shaft 324 are supported via bearings 343 to be rotatable about the horizontal axis by a pair of rotation axis support bodies 341 provided on both right and left sides. The pair of left and right rotation shaft supports 341 are disposed so as to be positioned inside the feed box 318.

The left and right rotation shaft support bodies 341 are fastened and fixed at three points to the left and right side walls 318A of the feed box 318 by fastening the positioning bolts 344 and the nuts 345. The three positioning bolts 344 are attached so as to straddle the rotary shaft support 341, the side wall 318A, and the lateral frame 346 attached to the outer surface side of the side wall 318A. The nut 345 for position fixing is welded and fixed to the inside of the rotation shaft support body 341.

As shown in fig. 37 and 38, the three bolt insertion holes 347 formed in the side wall 318A and the lateral frame 346 are formed in a shape elongated in the front-rear direction (the crop conveying direction) of the feed box 318. That is, in each of the left and right rotary shaft support bodies 341, the fixing of the rotary shaft support body 341 to the side wall 318A can be released by loosening the three positioning bolts 344, and the mounting position of the rotary shaft support body 341 to the side wall 318A can be changed and adjusted in the front-rear direction, and the rotary shaft support body 341 can be fixed to the side wall 318A at the changed mounting position by twisting the three positioning bolts 344.

[ frame structure ]

As shown in fig. 35 and 38, at a portion corresponding to the position adjustment mechanism 342 for the rotary shaft support 341, which is positioned on the right side of the feed box 318, a right lateral frame 346 having a substantially U-shaped cross section and extending in the conveying direction is provided on the outer surface of the right side wall 318A of the feed box 318, and the bottom surface portions 346a of the U-shaped plurality of surface portions of the right lateral frame 346 are integrally welded and fixed to the outer surface of the feed box 318 in a state of being in contact therewith.

As shown in fig. 38, a front frame 348 and a rear frame 349 are provided on the outer surface of the right side wall 318A at a distance from each other in the conveyance direction. The front frame 348 and the rear frame 349 are formed in a substantially U-shape in plan view, and are provided so as to extend over the entire width of the feed box 318 in the vertical direction. In the front side frame 348 and the rear side frame 349, like the right side horizontal frame 346, bottom surfaces of a plurality of U-shaped surface portions are integrally welded and fixed to the outer side surface of the feed box 318 in a state of being in contact therewith. Right lateral frame 346 is provided so as to straddle the rear end of front frame 348 and the front end of rear frame 349.

Both front and rear side portions of right lateral frame 346 are integrally welded and fixed to front side frame 348 and rear side frame 349.

As shown in fig. 35 and 37, a left lateral frame 350 having a substantially L-shaped cross section and extending in the conveying direction is provided on the outer surface of the left side wall 318A of the feed box 318 at a position corresponding to the position adjustment mechanism 342 for the rotary shaft support 341, which is positioned on the left side of the feed box 318, and one of the two L-shaped surface portions of the left lateral frame 350 is integrally welded and fixed in contact with the outer surface of the feed box 318.

The front frame 351 and the rear frame 352 are provided at intervals in the conveyance direction on the outer side surface of the left side wall 318A. The front frame 351 is formed in a substantially L-shape in plan view, and is provided so as to extend from the upper end of the feed box 318 to an intermediate position. The rear frame 352 is formed in a substantially U-shape in plan view, and is provided so as to extend over the entire width of the feed box 318 in the vertical direction. The left side cross frame 350 is integrally welded and fixed to the front frame 351 and the rear frame 352, respectively. In this way, the support strength of the portions corresponding to the left and right position adjustment mechanisms 342 is improved.

[ position adjusting mechanism ]

In the case where the endless rotating chain 326 extends in the expanding direction, i.e., the crop conveying direction, and the tension of the endless rotating chain 326 is reduced, the position adjusting mechanism 342 can adjust the installation position of the driven shaft 324 with respect to the feed box 318 in the conveying direction to adjust the tension of the endless rotating chain 326.

The left and right position adjustment mechanisms 342 have the same configuration, and as shown in fig. 35, 37, and 38, the position adjustment mechanism 342 includes: an adjustment screw shaft 353 extending in the conveying direction; a coupling portion 354 that couples the adjustment screw shaft 353 and the rotation shaft support 341; a restricting guide 356 supported by the feed box 318 and having an insertion portion 355 through which the adjustment screw 353 is movably inserted; an adjustment nut 357 attached to the adjustment screw shaft 353; and a coil spring 358 externally inserted to the adjustment screw shaft 353 in a state straddling the adjustment nut 357 and the restriction guide 356.

The rear shaft end of the adjustment screw shaft 353 is integrally coupled to the flange section 359. The flange section 359 includes a front-rear facing surface section 359A and a left-right facing surface section 359B, and is formed into a substantially L-shape in a plan view. Further, a reinforcing rib 359C is provided so as to straddle the front-rear facing surface portion 359A and the left-right facing surface portions 359B. The flange portion 359 is fixed in the following state: the rear shaft end of the adjustment screw shaft 353 is integrally connected to the front-rear facing surface portion 359A by welding, and the left-right facing surface portion 359B abuts against the side wall 318A of the feed box 318. Specifically, the left and right facing surface portions 359B of the flange portion 359 are fastened and fixed by the positioning bolt 344 located on the rearmost side among the three positioning bolts 344 and the nut 345 screwed and attached to the positioning bolt 344 in a state where the horizontal frame 346(350), the side wall 318A, and the rotation shaft support body 341 are fastened together.

Therefore, the positioning bolt 344 and the nut 345 located on the rearmost side constitute the inside-outside communicating portion 360 that is connected to straddle the inside and outside of the feed box 318, and the flange portion 359 and the inside-outside communicating portion 360 constitute the connecting portion 354 that connects the adjustment screw shaft 353 and the rotation shaft support 341.

The regulation guide 356 is supported in a state of being fixed to a lateral frame 346(350) attached to the outer surface side of the side wall 318A.

As shown in fig. 39, the right-side regulating guide 356 is provided inside the inner region surrounded by the U-shaped surface portions of the right-side horizontal frame 346 so as to extend over the entire width in the vertical direction while being fixed to the inner surface of the inner region. That is, the regulation guide 356 is a plate body that is orthogonal to the bottom surface of the right lateral frame 346, is located in the inner region, and is integrally connected to the bottom surface 346a of the right lateral frame 346 and the vertical surfaces 346b on both the left and right sides, respectively, by welding.

As shown in fig. 40, the left regulation guide 356 is provided inside the inner region surrounded by the two L-shaped surface portions (the bottom surface portion and the vertical surface portion) of the left lateral frame 350. In the left lateral frame 350, a vertical plate member 361 is integrally fixed by welding to one end of the bottom surface portion 350a opposite to the vertical surface portion 350b at a portion where the regulation guide 356 is provided. The regulation guide 356 is a plate body that is orthogonal to the bottom surface 350a of the left lateral frame 350, and is integrally connected to the bottom surface 350a, the vertical surface 350b, and the vertical plate member 361 of the left lateral frame 350 by welding.

As shown in fig. 39 and 40, a notch 362 is formed to be recessed from an end edge opened outward of the regulating guide portion 356 toward the bottom surface side. An insertion portion 355 is disposed through which the adjustment screw shaft 353 is inserted in the conveying direction through the inner portion of the notch 362. The adjustment screw shaft 353 is provided in a state where the insertion portion 355 is inserted, with the flange portion 359 fixed to the side wall 318A by the positioning bolt 344.

On the front side of the regulating guide 356, a coil spring 358 is externally fitted to the regulating screw shaft 353. Spacers 363 and 364 are provided between the restriction guide 356 and the coil spring 358 and between the adjustment nut 357 and the coil spring 358, respectively. Therefore, one end of the coil spring 358 is supported by the limiting guide 356 via the spacer 363, and the other end of the coil spring 358 is supported by the adjusting nut 357 via the spacer 364. The coil spring 358 is compressed by the tightening of the adjustment nut 357 and the receiving support by the restricting guide 356, and is used in a state of functioning as a compression spring that generates a spring force in the extending direction. Therefore, the coil spring 358 corresponds to a compression spring.

A washer 364 provided between the adjustment nut 357 and the coil spring 358 is provided with a cylindrical member 365 extending in the axial direction of the adjustment screw shaft 353 on the outer peripheral portion of the coil spring 358 in an integrally fixed state. Since a plurality of regions on the outer peripheral side of the coil spring 358 are covered with the cylindrical member 365, it is possible to avoid such a disadvantage that the coil spring 358 is scattered and accumulated with mud or the like to deteriorate the function of the spring.

In the position adjustment mechanism having such a configuration, when the three positioning bolts 344 and the nuts 345 are loosely fastened, the adjustment screw shaft 353 is slidable in the longitudinal direction of the bolt insertion hole 347 integrally with the rotation shaft support body 341. The adjustment screw shaft 353 is pressed by the spring biasing force of the coil spring 358, and the driven shaft 324 is biased to move in a direction away from the driving shaft 319.

Therefore, when the tension of the endless revolving chain 326 is adjusted in a state where the three positioning bolts 344 and the nuts 345 are loosely fastened, the tension of the endless revolving chain 326 can be adjusted to an appropriate value by adjusting the position of the adjusting nut 357 so that the length of the coil spring 358 becomes a predetermined length that is set in advance. That is, when the adjustment nut 357 is rotationally operated to move toward the coil spring 358, the adjustment screw shaft 353 moves forward, and the rotation shaft support 341 is moved forward to move the driven wheel body 325 forward. When the driven wheel body 325 moves forward, the tension of the endless revolving chain 326 hooked on the driven wheel body 325 increases, and the coil spring 358 elastically changes toward the compression side. When the distance D between the cylindrical member 365 and the washer 363 is a set distance, the tension of the endless rotating chain 326 matches the elastic restoring force of the coil spring 358 in the extending direction, and the tension of the endless rotating chain 326 reaches the set tension strength. Thus, three positioning bolts 344 are fastened.

Since the length of the coil spring 358 corresponds to the spring biasing force of the coil spring 358 in the compressed state and the length of the coil spring 358 corresponds to the distance from the rear end of the cylindrical member 365 to the spacer 363 on the side of the restriction guide portion 356 and can be easily visually determined, the tension of the endless rotating chain 326 can be adjusted in a small amount by adjusting the length of the coil spring 358.

For example, in the initial state where the slack of the endless rotating chain 326 is small, the length of the coil spring 358 can be adjusted to a predetermined length in a state where the driven wheel body 325 is positioned on the drive shaft 319 side, that is, on the rear side, and in the case where the slack occurs due to extension of the endless rotating chain 326, the length of the coil spring 358 can be adjusted to a predetermined length in a state where the driven wheel body 325 is slid to the front side, that is, the side opposite to the drive shaft 219 side.

According to the above configuration, as shown in fig. 35 to 38, the connection portion 354 connecting the adjustment screw shaft 353 and the rotation shaft support 341 is provided in a state of being positioned on the opposite side of the coil spring 358 with respect to the regulation guide portion 356. The adjustment nut 357 is attached to the front side, which is the side opposite to the coupling portion 354, with respect to the regulation guide portion 356. The adjustment screw shaft 353 extends in a cantilever manner at a position on the front side of the limiting guide 356. When attaching a tool to the adjustment nut 357, the tool can be attached while moving from the outside (front side) of the adjustment screw shaft 353 in the axial direction toward the axial direction. As a result, for example, a tool such as a ratchet wrench can be used. Although the ratchet wrench is a known structure and therefore is not illustrated, there is a ratchet mechanism having a ring-shaped sleeve that can be attached to the adjusting nut 357 in the axial direction, and an operating lever is integrally provided in the sleeve, and the adjusting nut 357 is rotationally operated in only one direction even if the operating lever is turned back and forth in a state where the sleeve is attached to the adjusting nut 357. As a result, even when the adjustment is performed in a narrow working space, the adjustment nut 357 can be easily turned.

[ Another embodiment of the third embodiment ]

(1) In the above embodiment, the restriction guide portion 356 is formed with the notch 362 through which the adjustment screw shaft 353 can radially enter the insertion portion 355, but instead, a circular insertion hole through which a bolt can be inserted may be formed in the restriction guide portion 356.

(2) In the above embodiment, the cylindrical member 365 is provided on the spacer 364 provided between the nut 357 and the coil spring 358, but instead, the coil spring 358 may be provided in a state of being opened outward without providing the cylindrical member 365.

(3) In the above embodiment, the lateral frame 346 having a substantially U-shaped cross section is provided on the outer surface of the feed box 318, and the adjusting screw axis 353 of the position adjusting mechanism 342 is provided in the inner region surrounded by the U-shaped surfaces of the lateral frame 346, but instead of this, a lateral frame having a substantially L-shaped cross section may be provided on the outer surface of the feed box 318, and a structure may be employed in which the rigidity of the lateral side wall of the feed box is increased without providing such a lateral frame, and the position adjusting mechanism is provided only in the feed box.

(4) In the above embodiment, the front frame 348 and the rear frame 349 are provided on the outer side surface of the feed box 318, but instead, a structure not including the front frame 348 and the rear frame 349 may be employed.

(5) The present invention can be applied to a combine harvester having a straw conveying device for conveying the whole straw of the harvested straw harvested by a harvesting unit toward the rear.

Description of the reference numerals

5 engines

7 reaping part

8 threshing device

8A machine body

8B roof plate part

8c side wall

9 grain box

15 exhaust pipe

16 space

16a space part

17 first exhaust pipe section

18 second exhaust pipe part

19 third exhaust pipe part

21 front support member

22 introducing port (introducing tube part)

23 rear support member

24 support frame

24b second support (bracket)

25 exhaust port

26 transverse frame

28 support post

30 exhaust pipe cover

32 working table

32F front table part

32R rear work table part

32c notch part

35 gap filling member

101 first exhaust pipe part

102 second exhaust pipe part

103 first inclined part

104 first bending part

105 first horizontal part

106 longitudinal frame

115. 116 bracket

112 second horizontal part

113 second bending part

114 second inclined part

119 side exhaust pipe cover

120 upper side exhaust pipe cover

204 threshing device

209 threshing cylinder

210 reaping part

211 conveying appliance (grain stalk conveying appliance)

218 feed box (conveying box)

219 drive shaft (downstream rotation axis)

219A plane part

222 drive sprocket (downstream wheel)

222B winding part (teeth)

Proximal end portion of 222D

222E wheel body

224 driven shaft (upstream side rotating shaft)

225 driven sprocket (upstream side wheel body)

229 antiwind cover

229A side dividing cover

229B on the other side

235 grain straw conveying port

250 constriction

251 circumference groove

252 overlap

253 fastener

256 bolts

272 projecting cylinder part

273 threaded hole

CL1 right and left direction center position

Center position of CL2

K fixing member

S-shaped abutting component

T1 first tube component

T2 second barrel component

310 reaping part

311 conveying device (grain straw conveying device)

318 feed box (transport box)

319 drive shaft (downstream rotation axis)

322 drive sprocket (downstream side wheel body)

324 driven shaft (upstream side rotating shaft)

325 driven wheel (upstream side wheel body)

326 ring rotating chain (Ring rotator)

327 conveying member

341 rotation shaft support body

342 position adjusting mechanism

346 transverse frame

348 front frame

349 rear side frame

353 adjusting threaded shaft

354 connecting part

356 restriction guide

357 nut

358 spiral spring (compression spring)

359 Flange part

360 inside and outside intercommunication portion

362 notch

363. 364 shim

365 cylindrical member.

Claims (35)

1. A combine harvester is characterized by comprising:

a harvesting part which is arranged at the front part of the machine body and harvests crops in a field;

a threshing device for threshing the crop harvested by the harvesting unit;

a grain box which is arranged in a state of being parallel to the threshing device in the transverse width direction of the machine body and stores grains obtained by the threshing device;

an engine disposed on the front side of the grain box; and

an exhaust pipe that discharges exhaust gas of the engine,

the exhaust pipe passes through the space between the threshing device and the grain box in a backward tilting state,

the exhaust port of the exhaust pipe is opened at a position corresponding to the rear end of the grain box in the space.

2. A combine harvester according to claim 1,

the exhaust port opens upward from the horizontal,

the combine harvester is provided with an upper side exhaust duct cover covering the upper side of the exhaust port.

3. A combine harvester according to claim 2,

the rear end portion of the exhaust pipe is disposed in a state of being inclined rearward and upward,

the upper exhaust pipe cover is disposed in a state of being inclined in an inclined direction of a rear end portion of the exhaust pipe.

4. A combine harvester according to claim 2 or 3,

a work table is provided above the space so as to be positioned above the exhaust pipe and so as to extend in the front-rear direction,

the upper exhaust pipe cover is connected to the work table.

5. A combine harvester according to claim 4,

the upper exhaust pipe cover is configured to have a rear end portion protruding upward from the work table and configured to be raised upward relative to the work table,

the rear end of the upper exhaust pipe cover extends rearward from the rear end of the exhaust port,

the space on the downstream side of the exhaust port in the blowing direction is open in the blowing direction.

6. A combine harvester according to any one of claims 1-5,

the side wall on the grain bin side of the threshing device is provided with a longitudinal frame extending in the up-down direction,

the exhaust duct is supported by a bracket, and the bracket is supported by the vertical frame in a state of protruding from the vertical frame toward the grain box side.

7. A combine harvester according to claim 6,

a side exhaust pipe cover which is arranged between the grain tank and the exhaust pipe and covers the exhaust pipe from the grain tank side and faces the upper and lower parts of the exhaust pipe to a plate shape,

a bracket different from the bracket supporting the exhaust pipe is supported by the side wall,

the side exhaust pipe cover is supported by the other bracket.

8. A combine harvester according to any one of claims 1-7,

the exhaust pipe is provided with: a first exhaust pipe portion having an inlet port for introducing exhaust gas of the engine; and a second exhaust pipe portion connected to a rear portion of the first exhaust pipe portion and having the exhaust port at a rear end,

the first exhaust pipe unit includes: a first inclined portion located on the front side and extending in a tilted posture of tilting backward; a first horizontal portion located on a rear side and extending in a horizontal posture; and a first bent portion connecting the first inclined portion and the first horizontal portion in a continuous state,

the second exhaust pipe portion includes: a second horizontal portion located on the front side and extending in a horizontal posture; a second inclined portion located on the rear side and extending in a tilted posture of a back tilt; and a second bent portion connecting the second horizontal portion and the second inclined portion in a continuous state,

the first and second exhaust pipe portions have double pipe portions.

9. A combine harvester according to claim 8,

in the first exhaust pipe section, the first inclined section is a single-layer pipe, and the first bent section and the first horizontal section are double-layer pipes,

in the second exhaust pipe section, the second horizontal section, the second bent section, and the second inclined section are all double-walled pipes.

10. A combine harvester according to claim 1,

the exhaust pipe is provided with: a first exhaust pipe portion having an inlet port for introducing exhaust gas of the engine; a second exhaust pipe portion connected to a rear portion of the first exhaust pipe portion; and a third exhaust pipe portion connected to a rear portion of the second exhaust pipe portion and having the exhaust port,

gaps through which air flows from the outside to the inside of the exhaust pipe are formed between the first exhaust pipe portion and the second exhaust pipe portion and between the second exhaust pipe portion and the third exhaust pipe portion, respectively.

11. A combine harvester according to claim 10,

the front part and the rear part of the first exhaust pipe part are supported on the threshing device,

the front part and the rear part of the second exhaust pipe part are supported on the threshing device,

the third exhaust pipe portion is supported by the second exhaust pipe portion.

12. A combine harvester according to claim 10 or 11, comprising:

a winnowing device which is vertically arranged in the space, is connected with the lower part of the threshing device and the upper part of the grain box, and supplies the grains obtained by the threshing device to the grain box;

a front support member extending from an upper portion of a side wall of the grain tank side of the threshing device to the grain tank side through a front of the winnowing device, and supporting a front portion of the winnowing device;

a rear supporting member extending from the upper portion of the sidewall to the grain box side through the rear of the winnower to support the rear of the winnower; and

a gap filling member provided between the sidewall and the grain thrower so as to straddle the front and rear support members,

the rear portion of the first exhaust pipe portion is supported by the front support member, and the front portion of the second exhaust pipe portion is supported by the rear support member.

13. A combine harvester according to any one of claims 10 to 12,

the first exhaust pipe portion is arranged in a tilted posture of being tilted backward,

the second exhaust pipe part is arranged in a horizontal posture,

the first exhaust pipe portion and the third exhaust pipe portion are single-layer pipes,

the second exhaust pipe part is a double-layer pipe.

14. A combine harvester according to any one of claims 10 to 13, comprising:

a work table provided above the exhaust pipe and extending in the front-rear direction is provided in an upper portion of the space,

the work table extends to the rear side of the exhaust port,

a notch portion is formed in a portion of the work table corresponding to the exhaust port of the exhaust pipe.

15. A combine harvester according to claim 14,

the threshing device is provided with a support frame which extends upwards from a side wall of the threshing device on the grain box side and supports the exhaust pipe and the workbench.

16. A combine harvester according to any one of claims 1-15,

the threshing machine body of the threshing device is provided with a machine body main body and a top plate part supported on the upper part of the machine body main body,

the exhaust pipe passes through the space part between the machine body main body and the grain box in the space,

the exhaust port opens in the space portion.

17. A combine harvester according to any one of claims 1 to 16, comprising:

a grain discharging device connected to the rear of the grain box, extending in the vertical direction of the body, and discharging grains from the grain box;

a supporting column which is vertically arranged at a position adjacent to the grain discharging device and supports the grain discharging device; and

a transverse frame connecting the side wall of the grain box side of the threshing device with the support,

the exhaust port is located on the front side of the lateral frame.

18. A combine harvester according to any one of claims 1-17,

an exhaust pipe cover provided between the grain tank and the exhaust pipe so as to straddle a position corresponding to a front end portion of the grain tank and a position corresponding to a rear end portion of the grain tank, the exhaust pipe cover covering the exhaust pipe from the grain tank side,

the exhaust pipe cover extends to the rear side of the exhaust port.

19. A combine harvester according to any one of claims 1 to 18, comprising:

a work table provided above the exhaust pipe and extending in a front-rear direction above the space;

a winnowing device which is vertically arranged in the space, is connected with the lower part of the threshing device and the upper part of the grain box, and supplies the grains obtained by the threshing device to the grain box;

a front support member extending from an upper portion of a side wall of the grain tank side of the threshing device to the grain tank side through a front of the winnowing device, and supporting a front portion of the winnowing device;

a rear supporting member extending from the upper portion of the sidewall to the grain box side through the rear of the winnower to support the rear of the winnower; and

a gap filling member provided between the sidewall and the grain thrower so as to straddle the front and rear support members,

the work table includes: a front table portion extending forward from the front support member; and a rear work table portion extending rearward from the rear support member.

20. A combine harvester according to claim 19,

the rear portion of the front table section is supported by the front support member, and the front portion of the rear table section is supported by the rear support member.

21. A combine harvester is characterized by comprising:

the harvesting part is arranged at the front part of the machine body; a grain straw conveying device which is connected with the rear part of the harvesting part and conveys the whole straw of the harvested grain straw harvested by the harvesting part to the rear part; and a threshing device for threshing the harvested rice straw conveyed by the rice straw conveying device,

the threshing device is provided with a threshing cylinder which is rotationally driven around a shaft core along the front and back directions of a machine body,

the grain and straw conveying device is provided with: a conveying box for conveying the grain and straw; a lateral downstream-side rotating shaft that is erected on a downstream side in a conveying direction of the conveying box; left and right downstream side wheel bodies provided on the downstream side rotating shaft at intervals in a shaft center direction of the downstream side rotating shaft; a transverse upstream rotary shaft that is erected upstream of the conveyance box in the conveyance direction; an upstream-side wheel body provided on the upstream-side rotating shaft; left and right annular rolling bodies wound so as to straddle the downstream-side rolling body and the upstream-side rolling body and provided at a left-right interval; a plurality of conveying members which are transversely arranged across the left and right annular rotating bodies at intervals in a conveying direction; and a cylindrical anti-winding cover which is inserted between the left and right downstream side wheel bodies and the downstream side rotating shaft,

a grain and straw conveying inlet is formed at the front wall part of the threshing device at the position corresponding to the lower part of the threshing cylinder when being observed from the front,

the grain and straw conveying device is connected with the grain and straw conveying inlet,

the anti-wind cover is composed of two divided covers divided along the axial direction of the downstream side rotating shaft, and the divided cover on one side of the two divided covers is inserted into the end part of the divided cover on the other side of the two divided covers in a manner of having an overlapping part,

the anti-wind cover is equipped in the following state: when the threshing device is observed from the front, the dividing cover body on the other side is positioned on the upstream side of the rotation direction of the threshing cylinder, and the dividing cover body on one side is positioned on the downstream side of the rotation direction of the threshing cylinder.

22. A combine harvester according to claim 21,

the overlapping portion is located on an upstream side in a rotation direction of the threshing cylinder from a left-right center position between the left and right downstream side wheel bodies in a front view.

23. A combine harvester according to claim 21 or 22,

a fastening member that penetrates the one divided cover body and the other divided cover body in the radial direction and is fixed thereto,

the fastening member is located at a position offset to the upstream side of the grain and straw conveying inlet in the rotation direction of the threshing cylinder from the left and right center positions of the overlapping portion in front view.

24. A combine harvester according to claim 23,

a plurality of the fasteners are provided at circumferentially spaced intervals of the anti-wind cover.

25. A combine harvester according to any one of claims 21-24,

the harvesting portion has a harvesting width wider than a transverse width of the straw conveying device,

the grain and straw conveying device is connected with the harvesting part in a state of being deviated to one side of the harvesting part corresponding to the upstream side of the grain and straw conveying inlet in the rotation direction of the threshing cylinder when being observed from the front.

26. A combine harvester according to any one of claims 21-25,

a circumferential groove having substantially the same shape as the anti-wind cover and recessed over the entire circumference is formed on the inner side surface of each of the left and right downstream side wheel bodies in the left-right direction,

the anti-wind cover is provided in a state where one end portion in the left-right direction of the one divided cover body is fitted into the circumferential groove formed in the downstream-side wheel body located on one side in the left-right direction and the other end portion in the left-right direction of the other divided cover body is fitted into the circumferential groove formed in the downstream-side wheel body located on the other side in the left-right direction,

the outer diameters of one end of the one divided cover body and the other end of the other divided cover body are the same,

the other divided cover body is formed as follows: the outer diameter of the end portion on one side overlapping the divided cover on the one side is larger than the outer diameter of the end portion on the other side.

27. A combine harvester according to claim 26,

a constricted portion is formed at a position on the other side in the left-right direction from the center position in the left-right direction of the other divided cover body, the constricted portion deforming the end portion on the other side to a small diameter.

28. A combine harvester according to any one of claims 21 to 27,

the downstream side wheel body includes: a base end portion located radially inside and externally fitted to the downstream-side rotary shaft so as to be rotatable integrally with the downstream-side rotary shaft; and a wheel body main body portion located radially outward of the base end portion, the wheel body main body portion having a winding portion around which the toroidal rotating body is wound on an outer circumferential portion thereof, the base end portion being formed to have a width in an axial direction wider than that of the wheel body main body portion in a state of having a protruding cylindrical portion protruding in the axial direction from the wheel body main body portion,

a flat surface portion is formed on the outer peripheral surface of the downstream side rotating shaft,

a threaded hole in a radial direction is formed in the protruding cylindrical portion of the base end portion at a position opposed to the flat surface portion,

the combine harvester holds the bolt inserted through the screw hole in the plane portion, and maintains the position of the downstream side wheel body in the axial direction.

29. A combine harvester according to any one of claims 21 to 28, comprising:

an abutting member located at one end in the axial direction of the downstream-side rotating shaft and fixed in position in the axial direction;

a first cylindrical member provided between the abutment member and one of the left and right downstream side wheel bodies, and having a length corresponding to an interval therebetween,

a second cylinder member provided between the downstream-side wheel body on the one side and the downstream-side wheel body on the other side, and having a length corresponding to an interval therebetween; and

and a fixing member capable of fixing the position of the downstream side wheel body on the other side in the axial direction.

30. A combine harvester is characterized by comprising:

a harvesting part arranged at the front part; and a straw conveying device connected to the rear part of the harvesting part and conveying the whole straw of the harvested straw harvested by the harvesting part backward,

the grain and straw conveying device is provided with: a conveying box for conveying the grain and straw; a lateral downstream-side rotating shaft located on a downstream side in a conveying direction of the conveying box; a downstream-side wheel body provided on the downstream-side rotating shaft; a lateral upstream-side rotating shaft located on the upstream side of the conveying box in the conveying direction; an upstream-side wheel body provided on the upstream-side rotating shaft; a plurality of annular rotating bodies wound so as to straddle the downstream-side wheel body and the upstream-side wheel body; a plurality of conveying members which are transversely erected so as to straddle the plurality of endless rotating bodies; a rotary shaft support body that supports the upstream rotary shaft so as to be rotatable about a shaft center thereof and supports the upstream rotary shaft so as to be changeable in position in a conveying direction in the conveying box; and a position adjustment mechanism capable of changing a position of the rotary shaft support body in the conveying direction and fixing the rotary shaft support body at the changed position,

the position adjustment mechanism is provided with: an adjustment screw shaft extending in the conveying direction; a coupling portion that couples the adjustment screw shaft and the rotation shaft support body; a regulating guide section supported by the conveyance case and having an insertion section through which the adjusting screw shaft is movably inserted; a nut attached to the adjustment threaded shaft; and a compression spring externally inserted to the adjustment threaded shaft in a state of straddling the nut and the regulation guide portion, wherein the coupling portion is located on a side opposite to the compression spring with respect to the regulation guide portion.

31. A combine harvester according to claim 30,

the rotary shaft support body is disposed in a state of being positioned inside the conveying box,

the adjusting screw shaft is provided in a state of being located outside the conveyance case,

the joint is provided with: a flange portion coupled to an end of the adjusting threaded shaft; and a left-right connecting portion that connects the flange portion and the rotation shaft support body in a state of being straddled between the inside and the outside of the conveyance case.

32. A combine harvester according to claim 30 or 31,

a notch allowing the adjustment screw shaft to enter the insertion portion in a radial direction is formed in the regulation guide portion,

a washer is provided between the restricting guide and the compression spring and between the nut and the compression spring, respectively.

33. A combine harvester according to claim 32,

the washer provided between the nut and the compression spring is provided with a cylindrical member extending in the axial direction of the adjustment threaded shaft on the outer peripheral portion of the compression spring.

34. A combine harvester according to any one of claims 30 to 33,

a transverse frame with a U-shaped cross section extending along the conveying direction is arranged on the outer side surface of the conveying box,

the horizontal frame is fixed in a state that a bottom surface part of a plurality of surface parts of the U shape is contacted with the outer side surface of the conveying box,

the adjusting screw shaft is arranged in an inner area of the transverse frame surrounded by a plurality of U-shaped surface parts,

the restricting guide portion is provided inside the inner region of the lateral frame so as to be fixed to an inner surface of the inner region and to extend vertically.

35. A combine harvester according to claim 34,

a front side frame and a rear side frame are provided on the outer side surface of the conveying box at intervals in the conveying direction,

the front side frame and the rear side frame are disposed so as to straddle the upper and lower sides of the conveyance case,

the lateral frame is provided so as to straddle the front side frame and the rear side frame.

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