CN112136512B

CN112136512B - Crawler travel device and harvester

Info

Publication number: CN112136512B
Application number: CN202010966601.3A
Authority: CN
Inventors: 三井孝文; 中岛伸六; 福冈义刚; 松下博昭; 仲岛铁弥; 古木大树; 成田靖; 冈田干夫; 吉田有作; 相田宙; 林茂幸; 有本敬; 森胁崇文; 一二三庆城; 寺园遥香; 大谷大树
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2012-07-10
Filing date: 2013-06-26
Publication date: 2024-03-01
Anticipated expiration: 2033-06-26
Also published as: CN112136512A; CN107347383B; CN106105579A; CN107347383A; CN106105549B; CN106105579B; WO2014010422A1; CN112136513A; CN104411155A; CN104411155B; CN106105549A

Abstract

The invention provides a crawler travel device with an improved roller mounting structure relative to a crawler frame. The crawler belt device comprises: a crawler belt (26) wound around a drive sprocket (21) and a tension sprocket (22), wherein the drive sprocket (21) is disposed at the front part of a crawler belt frame (20) supported by the machine body frame (3), and the tension sprocket (22) is disposed at the rear part of the crawler belt frame (20); and a plurality of rollers (23) for guiding the crawler belt (26) to the ground. Comprises an installation unit (60) extending along the front-back direction of the machine body, wherein the installation unit (60) is detachably installed on an installation component (6) arranged on a track frame (20). The mounting unit (60) supports rollers (23) arranged in the front-rear direction of the vehicle body in units of a plurality of bearings.

Description

Crawler travel device and harvester

The present application is a divisional application of the patent application of the invention with the application number 201710685944.0 and the invention name of a crawler traveling device and a harvester.

Technical Field

The invention relates to a crawler travel device and a harvester.

Background

[1] Patent document 1 discloses a crawler travel device of the type described above: a drive sprocket and a tension sprocket are provided at the front end and the rear end of a track frame extending in the front-rear direction of a vehicle body, and a plurality of rollers are mounted on the lower surface of the track frame between the drive sprocket and the tension sprocket. In this crawler travel device, a thick mounting plate is fixed to the lower surface side of the crawler frame by welding or the like, and a support body that pivotally supports the support shaft of the support roller is further bolted to the lower surface of the mounting plate. The support body includes a boss portion for supporting the support shaft, and a flange portion having a T-shaped cross section extending upward from the boss portion. The flange portion is provided with a through hole, and the mounting plate is provided with a female screw coaxial with the through hole. The support body is detachably fixed to the mounting plate, i.e., the crawler frame, by engaging the upper surface of the flange portion with the lower surface of the mounting plate and bolting the flange portion to the mounting plate. The support body is manufactured as a cast member in which a boss portion supporting one roller is cast integrally with a flange portion, one support body corresponding to one roller. That is, since one support is provided for each roller, when the number of rollers is large, the number of assembly steps increases, and the manufacturing cost of the support increases. In addition, when all the rollers are removed for maintenance, inspection, and the like, each roller is seventy-eight.

[2] As the harvester described above, for example, a harvester described in patent document 2 is known. The harvester described in patent document 2 includes a dust suction fan (in the document, a suction and dust discharge fan) and a catching member (in the document, a mesh body). The dust suction fan sucks dust in a feeder box (feeder casing in the literature) from a dust suction port and discharges the dust to the outside. The catching part is installed at the dust suction opening and catches the straw flowing towards the dust suction fan. This can prevent the straw from being sucked into the dust suction fan.

[3] Threshing devices equipped with such a harvester are known from the past. For example, the threshing device described in patent document 3 includes: a front grain tray provided at the upper front end of the screen box; a plurality of screen wires extending rearward from the rear end of the front grain pan while being arranged at predetermined intervals in the left-right direction; an auxiliary grain tray provided at a front upper portion of the screen box so as to be located rearward and downward of the front grain tray; and a plurality of auxiliary screening wires extending rearward from the rear end of the auxiliary grain tray in a state of being arranged at predetermined intervals in the left-right direction. The screen line and the auxiliary screen line screen the treated material, and the crushed straw and the like are transferred to the rear side while the single grain, the grain with the branch and the like are leaked down.

[4] Conventionally, as described in patent document 4, an operation lever (a "main shift lever" in the document) is disposed on the left side of a seat at a driving portion. In the technique described in patent document 4, a first command input mechanism (in the document, "cut/raise switch") and a second command input mechanism (in the document, "reel cross switch") are provided on the rear surface of the grip portion of the lever.

According to the technique described in patent document 4, the first command input means and the second command input means can be operated by one finger (for example, thumb) of the left hand while the operation lever is held by the left hand, and the operation commands to the plurality of control objects can be operated by one hand.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2003-276661

Patent document 2: japanese patent laid-open No. 2003-174815

Patent document 3: japanese patent laid-open No. 2007-20419

Patent document 4: japanese patent laid-open No. 2007-244335.

Disclosure of Invention

Problems to be solved by the invention

[1] The problems corresponding to the background art [1] are as follows.

In view of the above, it is desirable to have a track running device that improves the support structure of the rollers relative to the track frame.

[2] The problems corresponding to the background art [2] are as follows.

In the conventional harvester described above, since the catching member is formed of the mesh member, that is, the catching member includes the plurality of rod-like members disposed so as to cross each other across the dust suction port, the caught straw is easily wound around the catching member. Also, when a large amount of straw is wound around the catching member, the straw (straw aggregate) wound around the catching member becomes resistance, and the dust suction fan is difficult to suck dust.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a harvester in which the caught straw is less likely to be entangled with a catching member.

[3] The problems corresponding to the background art [3] are as follows.

However, in the threshing device described in patent document 3, since the screen wires and the auxiliary screen wires are formed to be substantially flat (to extend substantially linearly in the horizontal direction) in a side view, there is room for improvement in that the treated material is smoothly conveyed rearward.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a harvester including: the threshing processed objects from the grain tray can be smoothly conveyed by the screen line and simultaneously sorted.

[4] The problems corresponding to the background art [4] are as follows.

However, in the technique described in patent document 4, since the first command input means and the second command input means of different input operation modes are arranged on the same surface, there is a possibility that not only are both mechanisms mistakenly operated, but also a complicated operation by a finger (for example, thumb) is required, and operation input may not be performed particularly desirably when the operation lever is operated at the same time or the like.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a harvester which has less erroneous operation of an operation lever including two instruction input mechanisms and which is excellent in operability.

Means for solving the problems

[1] The solution to the problem [1] is as follows.

In order to solve the above problems, a crawler travel device according to the present invention includes: the crawler frame extends along the front-back direction of the machine body and is supported on the machine body frame; a drive sprocket disposed at a front portion of the track frame; a tension sprocket disposed at a rear portion of the track frame; a crawler belt wound around the drive sprocket and the tension sprocket; and a plurality of rollers for guiding the crawler belt to the ground, wherein the crawler belt is provided with a mounting unit which is detachably mounted on a mounting member and extends in the front-rear direction of the machine body, the mounting member is provided on the crawler belt frame, and the mounting unit supports the rollers arranged in the front-rear direction of the machine body in a plurality of units.

According to this configuration, since the plurality of rollers are supported by the mounting unit detachably fixed to the track frame as a result of the mounting member, the plurality of rollers can be integrally removed from or mounted to the track frame. And each roller can not fall into seven or eight directions.

The attachment unit that handles a plurality of rollers as a unit has a simple structure, and is required to facilitate the attachment/detachment operation with respect to the track frame. In one preferred embodiment of the present invention, the mounting means is constituted by a groove member extending in the front-rear direction of the machine body and opening downward, and a boss member disposed at a distance from each other in the front-rear direction of the machine body, the bottom plate portion of the groove member being bolted to the mounting member, and a roller shaft for mounting the roller being pivotally supported by the boss member. Since the mounting unit is provided with the elongated channel member and the boss member for pivotally supporting the roller shaft at the opening side of the channel member in correspondence with the arrangement pitch of the rollers, the unitized plurality of rollers are fixed to the track frame only by bolting the mounting unit to the track frame using the bottom plate portion of the channel member. Further, since the bottom plate portion of the channel member is used for bolt fastening, the bolt fastening portion is located in the channel of the channel member, and intrusion of muddy water and foreign matter from the outside can be suppressed.

For weight reduction, a relatively thin-walled angle pipe is often used for the track frame. Therefore, it is preferable that the mounting member between the track frame and the mounting unit is subjected to a bolt tightening force in the case of bolting the mounting unit to the track frame. In one preferred embodiment of the present invention, the attachment member is a reinforcing plate fixed to a frame body constituting the crawler belt frame, and female screws (holes in which female screws are formed) for fixing the bolts are formed in the reinforcing plate. Since the weight of the mounting member is increased by the presence of the mounting member other than the bolt fixing portion, it is preferable to have only the mounting member present at the bolt fixing portion. Therefore, the mounting member may be configured as a plurality of mounting member pieces arranged at intervals in the front-rear direction of the machine body. By providing such a mounting member with a shape and size that can function as a reinforcing plate for a track frame, the need for an additional reinforcing plate for the track frame is reduced.

In one of the preferred specific configurations of the mounting unit, the groove-shaped member is an elongated member having a U-shaped cross section, and is composed of a bottom plate portion that is in contact with the mounting member and a pair of left and right side plate portions that extend from respective side edges of the bottom plate portion, and the boss member is joined across the pair of left and right side plate portions. That is, the channel member is advantageous in terms of manufacturing cost because it is a simple structure in which a steel material of a simple shape known as channel steel is used downward and boss members are joined only to the edge portions of the side plate portions thereof by welding or the like.

In order to keep the boss member out of the way during the fastening operation of the fixing bolts for fixing the mounting unit to the track frame, in one preferred embodiment of the present invention, mounting holes for bolt fixing are formed in the bottom plate portion of the channel member at intervals in the machine body front-rear direction, and the boss member is joined to the middle of the mounting holes at intervals in the machine body front-rear direction.

In one preferred embodiment of the present invention related to the mounting structure of the tension sprocket, a support rod extending in the longitudinal direction of the machine body of the tension sprocket is supported by the track frame so as to be displaceable in the extending direction of the track frame, the track frame is a cylindrical body, the support rod has an outer cross section that coincides or substantially coincides with an inner cross section of the cylindrical body, the support rod is guided by an inner surface of the track frame to slide in the track frame, and a length of the mounting member and a length of a bolt for fixing a bottom plate portion bolt of the groove member to the mounting member are set so that an end of the bolt enters the track frame and does not interfere with the support rod. The mechanism for moving the tensioning sprocket in the front-rear direction of the machine body is composed of a support rod sliding in the cylinder body of the crawler frame, thereby reducing additional guide components and enabling the structure of the periphery of the crawler frame to be tidy.

The roller is constituted as follows: the roller shaft has protruding portions protruding from both ends of the boss member, and roller half bodies constituting the rollers are fixed to the protruding portions, whereby the protrusions of the crawler belt are brought into contact with each other from the outside, and the crawler belt can be guided satisfactorily.

In a preferred embodiment of the present invention, a crawler guide extending in the longitudinal direction of the machine body for guiding the lower return belt edge of the crawler is bolted to the channel member in a posture in which the crawler guide is sandwiched between side plate portions of the channel member. By adopting this configuration, the mounting unit can mount not only the roller to the track frame but also the track guide to the track frame in a stable double-bearing manner, which is advantageous in terms of both quality and cost. Further, the configuration in which the guide wheel for guiding the upper return belt edge of the crawler belt is attached to the crawler belt frame via the bracket is simple in structure in which the bracket extends straight upward from the crawler belt frame to the upper return belt edge, and is advantageous in terms of quality and cost.

[2] The solution to the problem [2] is as follows.

The invention is characterized in that it comprises: a feeder having a feeder box with a dust suction opening formed in a top plate, and conveying harvesting straw in the feeder box; a dust suction fan for sucking dust in the feeder box from the dust suction opening and discharging the dust to the outside; and a catching member attached to the dust suction port and catching straw flowing toward the dust suction fan, wherein the catching member includes a plurality of rod-shaped members disposed so as not to cross each other across the dust suction port.

According to this feature, the plurality of rod-like members are disposed so as not to cross each other across the dust collection opening in the catching member. That is, in the catching member, gaps between adjacent ones of the plurality of rod-shaped members are formed across the entire length of the dust collection opening. Therefore, even if the straw flowing toward the dust suction fan is caught by the plurality of rod-like members, the straw is less likely to be entangled between the adjacent plate-like members among the plurality of plate-like members.

Further, in the present invention, it is preferable that the plurality of rod-like members are substantially parallel to a conveying direction of the feeder.

Typically, a substantial portion of the straw within the feeder box is conveyed in a posture that intersects the direction of conveyance of the feeder. According to this feature, since the plurality of plate-like members are substantially parallel to the conveying direction of the feeder, that is, the longitudinal direction of the straw intersects with the direction of the plurality of rod-like members, the plurality of plate-like members easily act on the straw, and the straw flowing toward the dust suction fan can be firmly caught.

Further, in the present invention, it is preferable that the rod-shaped member is a round rod.

According to the present feature, since the rod-shaped member has no corner, the straw is not easily entangled with the rod-shaped member, and since the straw is not easily cut by the rod-shaped member, the occurrence of crushed straw sucked into the dust suction fan can be reduced.

Further, in the present invention, it is preferable that the dust collection fan is rotated around a left-right-oriented axial center.

According to this feature, since the dust collection fan is not opposed to the dust collection port in the axial direction of the dust collection fan, even if the straw flows from the dust collection port toward the dust collection fan, the straw is not easily brought into direct contact with the dust collection fan.

Further, in the present invention, it is preferable that the catching member is configured to be detachable from the feeder box.

According to this feature, since the catching member can be removed and replaced, maintainability can be improved.

Further, in the present invention, it is preferable that the dust collection device further includes a fan housing covering the dust collection fan, and the catching member is supported by being sandwiched between a top plate of the feeder box and a lower end of the fan housing.

According to this feature, the catching member can be stably supported.

Further, in the present invention, it is preferable that the fan housing further includes a projection projecting upward from the top plate, and the catching member and the lower end of the fan housing are fastened together to the projection by a fastening member.

According to this feature, the catching member and the fan case can be connected to the projection in a concentrated manner. Further, the positioning of the catching member and the fan housing is facilitated by the projection.

Further, in the present invention, it is preferable that the fan housing further includes a pressing member for pressing a lower end of the fan housing from above, and the pressing member is fastened together with the fan housing and the catching member to the protruding portion by the fastening member.

According to this feature, the pressing member, the fan housing, and the catching member can be integrated and simply connected to the protruding portion. In addition, the positioning of the pressing member, the fan housing, and the catching member is facilitated by the protruding portion.

Further, in the present invention, the fastener is preferably a wing nut or a knob nut.

According to this feature, the fastener can be tightened by hand without using a tool, and thus workability can be improved.

Further, in the present invention, it is preferable that the motor for driving the dust collection fan is provided, and the circuit breaker for the motor is provided adjacent to the dust collection fan.

According to this feature, since the circuit breaker is located in the vicinity of the motor, wiring between the circuit breaker and the motor can be easily wound.

[3] The solution to the problem [3] is as follows.

The present invention is characterized in that a grain tray is provided at a conveyance start end side of the screen box, and a screen wire is provided at a conveyance end portion of the grain tray, and the screen wire is formed in a substantially wave shape when viewed from a side.

According to this feature, the screen wire is formed into a substantially wave shape, and thereby the screen wire can exert a conveying action on the threshing processed product. Therefore, the threshing processed objects from the grain tray can be separated while being smoothly conveyed by the screen line.

Further, in the present invention, it is preferable that the screen wire is inclined so as to rise toward the conveyance end when viewed from the side.

According to this feature, the return action can be exerted on the threshing processed object by the screen wire by tilting the screen wire. Therefore, by returning the threshing processed product from the grain tray to the conveyance start end side by the sieve wire, a large number of sorting opportunities by the sieve wire can be ensured.

Further, in the present invention, it is preferable that a plurality of the wires are provided at a conveying end portion of the grain tray, and the plurality of wires are juxtaposed in a conveying direction in the screen box.

According to this feature, the threshing processed objects from the grain tray are sorted stepwise by the plurality of sieve lines, so that the sorting accuracy can be improved.

Further, in the present invention, it is preferable that, among the plurality of wires, the wire on the conveyance end side is provided at a position higher than the wire on the conveyance start side.

According to this feature, the threshing processed object falls from the screen line on the side of the conveying terminal located at the high position, and the pieces of the threshing processed object are broken by the impact when the threshing processed object falls, so that the sorting accuracy can be improved.

Further, in the present invention, it is preferable that, among the plurality of wires, a conveyance end side of the wire on a conveyance start side is provided at a position higher than a conveyance start side of the wire on a conveyance end side.

According to this feature, since a step is formed between the conveyance end side of the conveyance start side wire and the conveyance start side of the conveyance end side wire, the threshing processed product is less likely to be clogged during the transition between the conveyance end side wire and the conveyance end side wire. Further, the threshing processed object falls from the conveying end side of the screen wire on the conveying start side to the conveying start side of the screen wire on the conveying end side, and the pieces of the threshing processed object are broken by the impact when the threshing processed object falls, so that the sorting accuracy can be improved.

In the present invention, it is preferable that the plurality of wires are inclined so as to rise on the conveying end side in a side view, and the inclination angle of the wires is increased as the wires are located on the conveying end side.

According to this feature, the screen line on the conveying terminal side is inclined more, and thus the return action applied to the threshing processed object by the screen line is greater on the conveying terminal side. Therefore, the threshing processed product at the conveying end side is returned to the conveying start side by the screen wire, and thus, a large number of sorting opportunities by the screen wire can be ensured.

Further, in the present invention, it is preferable that the apparatus further comprises a windmill for supplying a separation wind to a conveying end portion of the grain tray in the screen box, wherein a predetermined gap is formed between a conveying end portion of one screen line and a conveying start end portion of the other screen line adjacent to each other in the conveying direction among the plurality of screen lines.

According to this feature, since the separation wind blows through the gap between one screen line and the other screen line, the separation wind smoothly flows. Moreover, by the gap between one screen line and the other screen line, the threshing processed object is not easy to be blocked during the joint of the one screen line and the other screen line.

Further, in the present invention, it is preferable that a coarse screen is provided below the screen wire in the screen box, and the gap overlaps with a conveyance start end side of the coarse screen in a plan view.

According to this feature, even if the threshing processed object falls from the gap between one screen line and the other screen line, the threshing processed object falls on the conveyance start end side of the coarse screen, and therefore the threshing processed object falling from the gap between one screen line and the other screen line can be continued to be transferred to the coarse screen.

Further, in the present invention, it is preferable that a coarse screen is provided below the screen wire in the screen box, and a screen wire on a conveyance end side of the plurality of screen wires is arranged above a conveyance start side of the coarse screen, and at least a part thereof overlaps with the conveyance start side of the coarse screen in a plan view.

According to this feature, since the threshing processed product from the wire at the conveyance start end side falls onto the conveyance start end side of the coarse screen, the threshing processed product falling from the wire at the conveyance start end side can be continued to be transferred to the coarse screen.

Further, in the present invention, it is preferable that a first type recovery unit is provided below the coarse screen, and a screen wire on a conveyance terminal side of the plurality of screen wires is arranged above the first type recovery unit, and at least a part thereof overlaps the first type recovery unit in a plan view.

According to this feature, since the threshing processed object from the wire on the conveying terminal side falls onto the first type recovery unit, the threshing processed object falling from the wire on the conveying terminal side can be recovered by the first type recovery unit.

In the present invention, it is preferable that at least a part of the wire protrudes upward from an upper edge of the screen box.

According to this feature, the threshing processed object falls from the screen line on the side of the conveying terminal at the high position, and the pieces of the threshing processed object are broken by the impact when the threshing processed object falls, so that the sorting accuracy can be improved.

Further, in the present invention, it is preferable that the apparatus further comprises a windmill for supplying a sorting wind to a conveying end portion of the grain tray in the screen box, the windmill comprising: a first air path through which the sorting air supplied to the lower part of the screen box flows; and a second air passage through which the separation air supplied to the upper portion of the screen box flows, wherein the second air passage supplies the separation air to the conveyance start end side of the screen box.

According to this feature, the first air passage and the second air passage are used to supply the separation air to the lower portion and the upper portion of the screen box separately, and the separation air can be distributed over the lower portion and the upper portion of the screen box. Further, by supplying the classifying air to the conveyance start end side of the screen box by the second air passage, the classifying air can be spread from the conveyance start end side to the conveyance end side of the screen box.

In the present invention, it is preferable that the grain tray is provided only at a conveyance start end portion of the screen box.

According to this feature, the grain tray is set short, and the area of the missed separation section is set large, so that the recovery rate of grains can be improved.

Further, in the present invention, it is preferable that the wind turbine includes a screen box and a wind turbine for supplying a classifying wind to the screen box, and the wind turbine includes: a first air path through which the sorting air supplied to the lower part of the screen box flows; and a second air passage through which the separation air supplied to the upper portion of the screen box flows, wherein the second air passage extends in the conveyance start end side direction and makes a U-turn in the conveyance end side direction, and the separation air is supplied to the conveyance start end side of the screen box.

According to this feature, the first air passage and the second air passage are used to supply the separation air to the lower portion and the upper portion of the screen box separately, and the separation air can be distributed from the lower portion to the upper portion of the screen box. Further, by supplying the classifying air to the conveyance start end side of the screen box by the second air passage, the classifying air can be spread from the conveyance start end side to the conveyance end side of the screen box. Further, since the second air passage has a longer air passage length as a result of forming the U-turn, the flow of the sorted air tends to be laminar. Therefore, the separation wind having a stable flow can be supplied.

In the present invention, the wind turbine preferably includes: a blade member rotatable about an axis in a conveying direction orthogonal to the direction in plan view; and a fan casing covering the blade member, wherein the second air passage communicates with an upper portion of the fan casing on a conveyance start end side.

According to the present characteristic configuration, the second air passage communicates with the upper portion of the conveyance start end side of the fan housing, so that the second air passage having the U-turn shape can be used to easily configure the second air passage having the U-turn shape for supplying the separation air to the conveyance start end side of the screen box.

Further, in the present invention, it is preferable that a third air passage through which the separated air from the second air passage flows is formed in the screen box.

According to this feature, the separation wind from the second wind path flows through the third wind path, and the separation wind can be reliably supplied to the upper portion of the screen box.

Further, in the present invention, it is preferable that the inlet portion of the third air passage is provided in a vertical wall of the screen box on a conveyance start end side.

According to this feature, the inlet portion of the third air passage is opened at the conveyance start end side front wall of the screen box, so that the second air passage and the inlet portion of the third air passage can be easily connected in communication.

In the present invention, it is preferable that the inlet portion of the third air passage is provided in a lower wall of the screen box on a conveyance start end side.

According to this feature, the inlet portion of the third air passage opens at the conveyance start end side lower wall of the screen box, and therefore the second air passage and the inlet portion of the third air passage can be easily connected in communication.

Further, in the present invention, it is preferable that the apparatus further comprises a screen box and a windmill for supplying the classifying wind to the screen box, wherein the screen box is provided with: a first grain tray provided at a conveyance start end side of the screen box; a second grain tray provided below the first grain tray; a missed separation section provided at a conveying terminal section of the first grain tray; and a coarse screen provided on the side of the conveying terminal of the second grain tray, wherein the drop-out sorting unit is disposed above the second grain tray and above the coarse screen.

According to this feature, the missed separation portion is extended above the coarse screen, so that the threshing processed product roughly separated by the missed separation portion is supplied to the coarse screen. Therefore, the sorting load applied to the coarse screen can be reduced. In addition, if the sorting load applied to the coarse sieve can be reduced, a large number of crops can be sorted without the coarse sieve and without the threshing device being enlarged.

In the present invention, it is preferable that the second cereal grain tray is disposed at substantially the same height as the coarse sieve.

According to this feature, since there is no step between the second grain pan and the coarse screen, the flow of the classifying wind of the windmill is good. Further, since the threshing product is roughly sorted by the missed sorting section, the threshing product is not clogged even if a step is not provided between the second cereal grain pan and the coarse sieve.

Further, in the present invention, it is preferable that the coarse screen is inclined so as to rise on the conveying end side when viewed from the side.

According to this feature, the threshing processed product is guided to the conveyance start end side along the inclination of the coarse screen, and is easily leaked from the conveyance start end side of the coarse screen. Therefore, grains can be recovered on the starting end side of the threshing device as much as possible, and loss of grains can be reduced. Further, since the threshing processed objects are roughly sorted by the missed sorting section, the threshing processed objects are not clogged even if the coarse screen is inclined to rise on the conveying terminal side.

[4] The solution to the problem [4] is as follows.

The invention is characterized by being equipped with: a first working unit; a second working unit different from the first working unit; and a third working unit different from the first working unit and the second working unit, wherein an operation lever capable of instructing an operation to the first working unit is provided near a driver's seat, a grip unit having a first surface and a second surface is provided on the operation lever, a thumb of an operator is positioned on the first surface, the second surface is a surface different from the first surface, four fingers other than the thumb are positioned on the second surface, a first instruction input mechanism capable of instructing an opposite operation to the second working unit and swinging the thumb along the first surface around a root is provided on the first surface, and a second instruction input mechanism capable of instructing an opposite operation to the third working unit and inputting an opposite operation instruction by a pressing operation of any one of the four fingers other than the thumb is provided on the second surface.

According to this feature, since the first command input means and the second command input means are disposed on different surfaces, malfunction of the two means is reduced as compared with the case where the first command input means and the second command input means are disposed on the same surface. The first command input means is a means for inputting by swinging the thumb along the first surface around the finger root, and the second command input means is a means for inputting by a pressing operation of any one of four fingers other than the thumb, and both means can be operated by a simple finger operation, so that operability is excellent, and reliable operation input can be performed even when the operation lever and the above means are operated simultaneously.

Further, in the present invention, it is preferable that the first command input means is a seesaw switch.

According to this feature, the first command input means is a seesaw switch (interactive switch) capable of selectively selecting different inputs, and thus, the operation command for the second working unit can be accurately input without simultaneously issuing the opposite operation command. Further, by the shape characteristic of the seesaw switch, since the two input portions are connected by the smooth surface, the thumb is moved from one input portion to the other input portion only by swinging the thumb along the surface of the seesaw switch. Thus, according to the present characteristic configuration, an input operation error of the first instruction input mechanism is prevented, and a smooth input operation of the first instruction input mechanism can be realized.

Further, in the present invention, it is preferable that the second instruction input means is a seesaw switch.

According to this feature, since the second instruction input means is a seesaw switch capable of selectively selecting different inputs, for example, when the index finger is placed at one input position and the middle finger is placed at the other input position, the input operation of the second instruction input means can be performed by only pressing any one of the fingers without moving the entire hand. Further, the operation command for the third working unit can be accurately input without simultaneously issuing the opposite operation commands by the two fingers. Thus, according to the present characteristic configuration, the input operation of the second instruction input mechanism can be easily performed, and the input operation error of the second instruction input mechanism is prevented.

Further, in the present invention, it is preferable that an upper surface on which a palm of a hand of the operator is placed is formed on the grip portion, the upper surface being a surface different from the first surface and the second surface, the first command input means is formed on a side portion of the grip portion on a side close to the operator, and the second command input means is formed on a side portion of the grip portion on a side away from the operator.

According to this feature configuration, when the lever is held in a state in which the palm of the hand is placed on the upper surface of the lever, the thumb is positioned on the first surface and the other four fingers are positioned on the second surface in a natural posture without being in a barely natural posture.

Further, in the present invention, it is preferable that the second instruction input means is disposed so as to be inclined downward as it is farther from the operator.

According to this feature configuration, in the lever of the type held from above as described above, the further away the second instruction input mechanism is tilted, the further down the operator is, and therefore, the further away the body the finger (little finger) is bent in. As a result, the little finger side is strongly held, and the force is firmly applied to the hand and the finger, so that the second instruction input mechanism can be accurately operated.

Further, in the present invention, it is preferable that the upper surface is inclined so as to be positioned downward as it is farther from the operator.

According to this feature, the upper surface of the lever is inclined so as to be positioned downward as it is farther from the operator, and thus the hand holding the lever is lowered outward. At this time, the forearm is naturally inclined along the hand so as to avoid twisting the wrist. As a result, the elbow is close to the body, and the armpits are closed, so that the load on the shoulders is less likely to be applied than in the armpit open state.

Further, in the present invention, it is preferable that the second instruction input means is arranged along the direction of the upper surface.

In general, the four fingers other than the thumb can strongly exert pressing operation forces, such as the index finger, the middle finger, and the ring finger. In a state where the operation lever is held from above, the distal ends of the three fingers are located at substantially the same distance from the upper surface. According to this feature, in a natural state, any two fingers among the index finger, the middle finger, and the ring finger are positioned in the second command input means, and the operation of the second command input means is easy.

In the present invention, it is preferable that the second surface is inclined so as to be located rearward as it is farther from the operator in a plan view.

According to this feature, since the posture of the hand is opened outward in the front-rear direction in a plan view, the armpits are naturally closed, and even if the arm is moved forward and backward for operating the lever forward and backward, the burden on the shoulder, elbow, or the like is less likely to be imposed.

In the present invention, it is preferable that the first surface is inclined so as to be positioned forward as it is farther from the operator in a plan view.

Further, in the present invention, it is preferable that the first working unit is a transmission device of a traveling transmission, and the operation lever is a shift lever capable of instructing a shifting operation to the transmission device.

According to this feature, since the first command input means and the second command input means are provided in the shift lever having a high frequency of use, the movement of the hand for the operation input of these means can be reduced.

Further, in the present invention, it is preferable that the shift lever is a main shift lever.

According to this feature, since the first command input means and the second command input means are provided on the main shift lever that is normally held at all times, it is not necessary to intentionally move the hand for the operation input of these means.

Further, in the present invention, it is preferable that the second working unit or the third working unit is a harvest control unit for lifting and lowering the harvest unit or a reel lifting and lowering control unit for lifting and lowering a drag reel provided in the harvest unit.

According to this feature, the first working unit can be operated by the lever, and the lifting operation of the harvesting unit or the lifting operation of the reel can be performed by the hand holding the lever, so that the combine harvester excellent in operation can be obtained.

Further, in the present invention, it is preferable that the second working unit is a harvesting lifting control unit that lifts and lowers the harvesting unit.

According to this feature, the first working unit is operated by the lever, and the lifting operation of the harvesting unit is performed by the hand holding the lever, so that the combine harvester excellent in operation condition can be obtained. Further, since the first command input means is input by the thumb positioned closer to the body than the other four fingers, the third working unit is a working unit positioned further to the front side (away from the body) than the cutting unit, and in this case, it can be intuitively understood that the means capable of instructing the lifting operation of the cutting unit is the first command input means, and mistakes with the second command input means are less likely to occur.

Further, in the present invention, it is preferable that the second working unit is a harvest lift control unit for lifting and lowering a harvest unit for harvesting field crops.

According to this feature, the first working unit can be operated by the lever, and the harvesting unit can be lifted and lowered by the hand holding the lever, so that the combine harvester can be operated in an excellent manner.

Further, in the present invention, it is preferable that the third working unit is a spool elevation control unit that elevates the drag spool.

According to this feature, the first working unit can be operated by the lever, and the lifting operation of the raking reel can be performed by the hand holding the lever, so that the combine harvester excellent in operation can be obtained. Further, since the second command input means is input by the other four fingers located at a position farther from the body than the thumb, the second working section is a working section located at a position farther to the rear side (closer to the body) than the drag roller, and in this case, it can be intuitively understood that the means capable of instructing the lifting operation of the drag roller is the first command input means, and mistakes with the first command input means are less likely to occur.

Further, in the present invention, it is preferable that the third working unit is a rotary chopper lifting control unit that lifts and lowers a rotary chopper that pulverizes stalks left in the field after harvesting the crops.

According to this feature, the first working unit can be operated by the lever, and the lifting operation of the rotary chopper can be performed by the hand holding the lever, so that the combine harvester excellent in operation can be obtained.

In the present invention, it is preferable that the lever guide for guiding the operation lever is provided at a height position substantially equal to a height position of a seat surface of the driver's seat.

According to this feature, the operation lever can be disposed at a height position where the operator can easily operate the operation lever.

In the present invention, it is preferable that the lever is provided on the right side of the driver seat.

According to this feature configuration, for example, when traveling on a road in a country where right-hand traffic is regulated by law, a shift operation can be performed with the same feeling as a general automobile or the like in the country (driver seat: left side of vehicle body, shift lever: right side of driver seat).

Further, in the present invention, it is preferable that the first working unit is a transmission device of a traveling transmission including a front wheel and a rear wheel, and the traveling transmission drives the front wheel and the rear wheel.

According to the present characteristic constitution, it is advantageous to travel on the road outside the field as compared with the crawler-type combine harvester.

In the present invention, it is preferable that the rear wheel is a steering wheel, and a steering wheel for steering the rear wheel is provided.

According to this feature, since the rear wheels are steered wheels, the turning radius can be set smaller than that of the front wheels, and the combine harvester can turn in a narrow place. Further, since the steering wheel is used to steer the rear wheels, the steering support can be set to a larger operation amount per unit turning amount than the steering lever, and the turning operation can be performed with a small indication of the turning amount and with a broken piece.

Drawings

Fig. 1 is a schematic view illustrating the basic constitution of a crawler belt running apparatus of a first embodiment of the present invention.

Fig. 2 is a side view showing the whole of a combine harvester equipped with one of specific embodiments of the crawler travel device of the first embodiment of the present invention.

Fig. 3 is a side view of the crawler travel device.

Fig. 4 is a cross-sectional view taken along line IV-IV of fig. 3.

Fig. 5 is a sectional view taken along the line V-V of fig. 3.

Fig. 6 is a cross-sectional view taken along line VI-VI of fig. 3.

Fig. 7 is a plan view showing an advancing and retreating mechanism for supporting the tension sprocket.

Fig. 8 is a perspective view showing a mounting structure of the crawler guide.

Fig. 9 is a side view showing a general type combine harvester according to a second embodiment of the present invention.

Fig. 10 is a plan view showing a general combine harvester.

Figure 11 is a side cross-sectional view showing the suction fan and catch member.

Fig. 12 is a front cross-sectional view showing the dust collection fan and the catching member.

Fig. 13 is a top cross-sectional view showing the dust collection fan and the catching member.

Fig. 14 is an exploded perspective view showing the dust suction fan and the catching member.

Fig. 15 is an exploded perspective view showing a dust collection fan and a catching member according to another embodiment of the second embodiment of the present invention.

Fig. 16 is a side cross-sectional view showing a threshing device according to a third embodiment of the invention.

Fig. 17 is a side cross-sectional view showing the front side of the sorting section.

Fig. 18 is a front cross-sectional view showing the front portion of the sorting section.

Fig. 19 is a side cross-sectional view showing the left side of the front side of the sorting section.

Fig. 20 is a side cross-sectional view showing the right side portion of the front portion side of the sorting section.

Fig. 21 is a diagram showing a power transmission path of the power transmission shaft.

Fig. 22 is a plan view showing the first screen line and the second screen line.

Fig. 23 is a perspective sectional view showing the first screen line and the second screen line.

Fig. 24 is a side cross-sectional view showing the rear side of the sorting section.

Fig. 25 is a plan view showing the first straw walker, the second straw walker, and the third straw walker.

Fig. 26 is a perspective sectional view showing the first straw walker, the second straw walker, and the third straw walker.

Fig. 27 is a side view showing the whole of a combine harvester according to a fourth embodiment of the present invention.

Fig. 28 is a plan view showing the driving unit.

Fig. 29 is a front view showing the driving portion.

Fig. 30 is a plan view showing the periphery of the main shift lever.

Fig. 31 is a partial cross-sectional view showing a front view of the periphery of the main shift lever when the main shift lever is located in the work progress area.

Fig. 32 is a perspective view showing a driver's seat.

Fig. 33 is a cross-sectional view of XXXIII-XXXIII in fig. 31.

Fig. 34 is a side view showing the whole of a corn harvester according to another embodiment of the present invention.

Detailed Description

First embodiment

A first embodiment of the present invention will be described below.

Before describing a specific embodiment of the harvester according to the first embodiment of the present invention, a basic structure having the features of the present invention will be described with reference to fig. 1.

The crawler travel device 1 includes a crawler frame 20 supported by a body frame 3 of a work vehicle such as a combine or a backhoe. The track frame 20 extends in a pair from left to right in the machine body front-rear direction, and the track frame 20 on the left side in the forward direction is illustrated in fig. 1. A drive sprocket 21 is disposed at the front of the track frame 20, and a tension sprocket 22 is disposed at the rear of the track frame 20. A crawler belt 26 is wound around the span drive sprocket 21 and the tension sprocket 22. A plurality of rollers 23 for guiding the crawler 26 in the ground direction are disposed below the crawler frame 20.

The roller 23 is a structure in which a pair of left and right roller half bodies 23a are connected by a roller shaft 8. A mounting member 6 having an internal thread 6a is provided on the lower surface of the track frame 20, and the internal thread 6a is used for mounting the roller 23. The roller 23 is attached to the attachment member 6 via the attachment unit 60 by the fixing bolt 90, and as a result, is detachably attached to the track frame 20. Since the female screw 6a needs to have a sufficient length in order to strengthen the screw fastening by the fixing bolt 90, the mounting member 6 is formed of a thick-walled member, and the mounting member 6 also functions as a reinforcing plate constituting a frame body (typically, a profiled bar such as a corner tube) of the track frame 20. Further, from the viewpoint of weight, the attachment member 6 is preferably not a single elongated member but is intermittently arranged in a plurality of attachment member pieces.

Since the plurality of rollers 23 are mounted in one mounting unit 60, by removing the mounting unit 60 from the mounting member 6, the plurality of units of rollers 23 are also removed. The mounting unit 60 is composed of a boss member 60B that pivotally supports the roller shaft 8, and a groove member 60A that fixes the boss member 60B. The boss member 60B is a cylindrical body, and bearings are mounted on inner wall surfaces of both ends thereof to pivotally support the roller shaft 8 penetrating the boss member 60B. The roller half bodies 23a are fixed to protruding portions of the roller shaft 8 protruding from both ends of the boss member 60B, respectively.

The channel member 60A is a longitudinal member in which a recess opening downward is formed, and has a substantially inverted U-shape in cross section, a gate shape, and an arch shape, but a solid portion or a cross-sectional wall may be provided midway in the front-rear direction. At least a part of the upper surface portion of the groove-shaped member 60A is formed as a horizontal surface and is in surface contact with an abutment surface formed at the lower portion of the mounting member 6. The plurality of boss members 60B are preferably joined by welding so as to span the side portions hanging down from the left and right ends of the upper surface portion of the groove member 60A at predetermined intervals in the machine body front-rear direction. In order to secure the welding length between the groove-shaped member 60A and the boss member 60B, an arc-shaped receiving surface for holding the boss member 60B is formed on a side surface portion thereof, or a flange plate that functions as an auxiliary member for connecting the relay material is provided.

Through holes through which the fixing bolts 90 pass are provided in the upper surface portion of the groove-shaped member 60A at intervals not overlapping the boss member 60B. The through hole corresponds to the position of the female screw 6a of the mounting member 6. Thus, when the mounting unit 60 is detachably fixed to the mounting member 6, the fixing bolt 90 inserted through the through hole from the lower opening of the groove formed in the groove-shaped member 60A is screwed into the female screw 6a of the mounting member 6.

Next, one of the embodiments of the crawler travel device 1 of the present invention will be described with reference to the drawings. The crawler travel device 1 is equipped to a combine harvester. Fig. 2 is a side view of the combine harvester.

As shown in fig. 2, the combine is a general combine, and has a pair of right and left crawler traveling devices 1 below a body frame 3 extending in the front-rear direction as a traveling direction, and the pair of right and left crawler traveling devices 1 are driven by a driving force from an engine (not shown) provided below a driver seat 11, thereby automatically traveling. A harvesting unit 10 is connected to the front part of the machine frame 3, and a threshing device 12 and a grain box 13 are provided to the rear part of the machine frame 3. The cutting unit 10 is swingably lifted and lowered between a lowered operation position and a raised non-operation position by a hydraulic cylinder 15. In this combine harvester, harvesting operations such as rice and wheat are performed by positioning the harvesting unit 10 at a lowered operation position and advancing the travelling body.

The harvesting unit 10 includes a rotary drum 10a for cutting the crop to be harvested with the tip side facing rearward Fang Balong, a hair-clipper-type harvesting device 10b for cutting the root of the crop, a feeder 12a for feeding the straw to the rear side of the machine body and supplying the straw to the threshing device 12, and the like. The grain box 13 recovers and stores the threshed grains conveyed from the threshing device 12. The stored threshed grains are conveyed to the outside by the auger 14.

Fig. 3 is a side view showing the entire left crawler travel device 1. Fig. 4 is a sectional view taken along line IV-IV in fig. 3. As shown in fig. 3 and 4, the crawler travel device 1 includes a crawler frame 20 extending in the front-rear direction as a base body. The crawler frame 20 is supported on the body frame 3 so as to be suspended from the body frame 3 via the front bracket 16a and the rear bracket 16 b. The track frame 20 is a square-section angle pipe.

A drive sprocket 21 supported by the transmission case 17 is attached to a front portion of the track frame 20 via an attachment member 16c connected to the front bracket 16a, the track frame 20, and the machine frame 3. The tension sprocket 22 is attached to the rear end portion of the track frame 20 via an advancing/retreating mechanism 30 supported by the track frame 20. A rubber crawler 26 is wound around the drive sprocket 21 and the tension sprocket 22. Between the drive sprocket 21 and the tension sprocket 22, 6 rollers 23 are arranged below the track frame 20, and the rollers 23 guide the belt edges of the track 26 that are returned on the ground side. The drive sprocket 21 and the tension sprocket 22 mesh with teeth formed in a valley portion 26c, the valley portion 26c being formed between a pair of left and right core member protrusions 26a, the core member protrusions 26a being provided in core members buried in a plurality of portions in the longitudinal direction of the crawler belt 26. The roller 23 presses the crawler belt 26 into the ground so as to straddle the pair of left and right core member protrusions 26 a.

The plurality of rollers 23 are supported on the track frame 20 via a mounting unit 60 divided into a front side and a rear side. In order to fix the mounting unit 60 to the track frame 20 by bolts, the mounting member 6 is welded to a mounting portion of the lower surface of the track frame 20 to the mounting unit 60. The attachment member 6 has a thickness that is several times the thickness of the track frame of each tube, and also functions as a reinforcing plate for the track frame 20. The mounting member 6 is provided with a through hole, and a female screw 6a for bolt fastening is formed in the through hole. Further, in the case of bolting, an opening 20a for receiving a bolt distal end portion protruding from the attachment member 6 is also provided in the lower surface of the crawler belt frame 20.

In this embodiment, the 6 rollers 23 are divided into front and rear two groups of 3 rollers 23, and each group is mounted to a mounting unit 60 divided into front and rear sides. The two mounting units 60 are bolted to the track frame 20 as described above. The front side mounting unit 60 and the rear side mounting unit 60 are not identical in shape but are not substantially different, and thus are collectively described herein.

The mounting unit 60 is composed of a groove-shaped member 60A and a boss member 60B welded to the groove-shaped member 60A. The groove-shaped member 60A is an elongated member composed of a bottom plate portion 62 and left and right side plate portions 61, both of which are plate materials. The left and right side plate portions 61 are connected to the bottom plate portion 62 from the left and right ends of the bottom plate portion 62, respectively, and an inner space having a rectangular cross section and opening downward is created between the bottom plate portion 62 and the left and right side plate portions 61. Channel steel having a bottom plate portion 62 and side plate portions 61 integrally formed may be used as the channel member 60A. The boss member 60B is a cylindrical body having a substantially constant outer diameter, and has an axial length longer than the distance between the left and right side plate portions 61. As a result, the boss member 60B has a portion protruding outward from the side plate portion 61. A semicircular cutout is provided in the side plate portion 61 in cooperation with the attachment pitch of the roller 23, and the side plate portion 61 and the boss member 60B are welded in a state in which the outer peripheral surface of the boss member 60B is fitted into the cutout.

The roller 23 is composed of a roller shaft 8 and a pair of left and right roller half bodies 23a bolted to both ends of the roller shaft 8. Ball bearings 80 for supporting the roller shaft 8 are disposed on the inner wall surfaces of the boss member 60B in both end regions, and rotatably support the roller shaft 8. A seal member 81 is mounted on the outer side of each ball bearing 80. The roller shaft 8 is longer than the boss member 60B, and the roller half bodies 23a are fixed to protruding portions of the roller shaft 8 protruding from both ends of the boss member 60B. A grease filling hole 8a is formed in the roller shaft 8, and grease filled from a grease filling hole provided at an end portion of the roller shaft 8 is filled into a space formed between the inner wall surface of the boss member 60B and the pair of left and right ball bearings 80 through the grease filling hole 8 a. A relief mechanism is formed to release the excess pressure when the grease pressure in the space increases. The drain mechanism is a plug 82 screwed with a through-screw hole provided in the peripheral wall of the boss member 60B, and an axial through-hole 82a is formed in the plug 82 as a drain hole.

As described above, since the 3 rollers 23 are integrated with the mounting unit 60, the 3 rollers 23 are fixed to the track frame 20 by fixing the mounting unit 60 to the track frame 20. In order to fix the mounting unit 60 to the track frame 20, the fixing bolts 90 are inserted into the through holes 62a provided in the bottom plate portion 62 from between the left and right side plate portions 61, and screwed into the through holes of the mounting member 6 in which the female screw 6a is formed. A spacer 91 is interposed between the bolt head of the fixing bolt 90 and the bottom plate portion 62 of the channel member 60A, except for washers and spring washers. The backing plate 91 may be provided for each fixing bolt 90, but may be a long plate common to a plurality of fixing bolts 90. The pad 91 is fixed to the track frame 20 by welding or the like. Further, as is clear from fig. 3, for each mounting unit 60, two mounting members 6 are arranged at intervals in the front-rear direction. Each of the mounting members 6 has two through holes formed with female screws 6a screwed with the fixing bolts 90, and the rollers 23 are sandwiched between the two through holes in a side view. Since the lower side of the fixing bolt 90 is opened, the bolt fixing work is easy. In addition, both the left and right sides of the fixing bolt 90 are covered with the side plate portion 61, and there is little possibility that muddy water and foreign matter are directly received.

As shown in fig. 5, the guide wheel 25 for guiding the upper return belt edge of the crawler belt 26 has substantially the same structure as the roller 23, and is composed of a roller shaft 8 and a pair of left and right guide wheel half bodies 25a bolted to both ends of the roller shaft 8. The guide wheel mounting unit 63 for mounting the guide wheel 25 to the track frame 20 is also similar to the mounting unit 60 of the roller 23. The guide wheel mounting unit 63 is composed of a bracket 63A and a boss member 63B, and the boss member 63B is identical to the boss member 60B of the mounting unit 60. The bracket 63A is constituted by a pair of left and right bracket plates, one ends of which are welded to the boss members 63B, respectively, and the other ends of which are welded to the upper surface of the track frame 20. Of course, the guide wheel attachment unit 63 may be configured to be bolted to the track frame 20 in the same manner as the attachment unit 60 of the roller 23. The bracket 63A may be connected to the rear bracket 16b, and the rear bracket 16b may connect the track frame 20 to the body frame 3.

As shown in fig. 6 and 7, the tension sprocket 22 is incorporated into an advancing and retreating mechanism 30 provided at the rear end portion of the track frame 20 so as to be movable and adjustable in the front-rear direction with respect to the track frame 20. The tension sprocket 22 is rotatably supported by the tension shaft 22b via a ball bearing provided on a boss portion thereof. The sprocket portion 22a of the tension sprocket 22 has a cross-sectional shape in which a quadrangle is added to the trapezoid, instead of the trapezoid cross-section, and strength is improved by adding the quadrangle cross-section. As a result, the tensioner sprocket 22 has a larger diameter than before.

The advancing and retreating mechanism 30 includes a holding unit 31, a support rod 32, and an adjusting screw mechanism 33. The holding unit 31 is composed of a plate-shaped base 31b and a pair of left and right side plates 31a standing on the rear surface of the base 31 b. The tension shaft 22b rotatably supporting the tension sprocket 22 is supported by the pair of left and right side plates 31 a. A support rod 32 extending in the front-rear direction of the machine body is coupled to the front surface of the base 31 b. The support rod 32 has a quadrangular outer cross section that matches or substantially matches the quadrangular inner cross section of the track frame 20, and is guided by the inner surface of the track frame 20 so as to be inserted into the track frame 20 slidably in the machine body front-rear direction.

The adjusting screw mechanism 33 has a pair of left and right sides sandwiching the track frame 20. Each of the adjusting screw mechanisms 33 has an adjusting screw body 33a as a threaded rod, a first screw body receiving portion 33b, and a second screw body receiving portion 33c. The first screw receiving portion 33b is fixed to the base 31b of the holding unit 31, and the second screw receiving portion 33c is fixed to the bracket 27 coupled to the crawler frame 20. The first screw receiving portion 33b and the second screw receiving portion 33c hold the adjusting screw 33a so that the adjusting screw 33a is parallel to the support rod 32. The first screw receiving portion 33b has a through-hole screwed with the screw portion of the adjustment screw 33a. The second screw receiving portion 33c has an engagement hole that is penetrated by the main body portion of the adjustment screw 33a and that prohibits relative axial movement with the adjustment screw 33a. That is, the adjusting screw mechanism 33 is a screw-type reciprocating mechanism using the first screw receiving portion 33b as a stopper member. Therefore, the tension sprocket 22 is advanced while being guided by the support bar 32 and the track frame 20 by rotating the adjustment screw 33a in one direction, and the tension sprocket 22 is retracted by rotating the adjustment screw 33a in the other direction. The tension sprocket 22 is fixed in its optimal position by the optimal tension of the track 26 generated by the adjustment of the movement of the tension sprocket 22 relative to the track frame 20 in the fore-aft direction of the machine body.

In addition, as can be understood from fig. 4 and 7, when the tip end of the fixing bolt 90 near the tension sprocket 22 among the fixing bolts 90 fixing the mounting unit 60 to the track frame 20 enters the inside of the track frame 20, interference with the support bar 32 occurs. Therefore, the length of the fixing bolt 90 that may interfere with the support rod 32 and the length of the mounting member 6 into which the fixing bolt 90 is inserted are set so that the tip end of the fixing bolt 90 does not reach the inside of the track frame 20 even if the fixing bolt 90 is fastened to the maximum extent.

As shown in fig. 4, 5 and 6, the pair of left and right roller half bodies 23a of the 6 rollers 23 are located on both lateral outer sides of the pair of left and right core member protrusions 26a of the crawler belt 26, respectively, and support and act on the inner peripheral surface of the crawler belt 26. As shown in fig. 3 and 8, the crawler guides 28, which press-fit the valleys 26c formed between the pair of left and right core member protrusions 26a, are bolted to the side plate portions 61 of the channel member 60A of the mounting unit 40.

The crawler belt guide 28 is composed of a ski-like guide body portion 28a and a mounting portion 28b protruding from the upper surface of the guide body portion 28a, and the guide body portion 28a and the mounting portion 28b are integrally formed by casting. The guide main body portion 28a has a width corresponding to the valley portion 26c of the crawler belt 26, and the mounting portion 28b has a width corresponding to the interval between the left and right side plate portions 61 of the channel member 60A. Common through holes 61a and 28c are provided in the side plate portion 61 and the mounting portion 28b at intermediate positions between the adjacent roller shafts 8, and the crawler guides 28 are bolted to the mounting units 40 by the through holes 61a and 28 c.

Other embodiments of the first embodiment

(1) In the first embodiment described above, 3 rollers 23 are provided as one set to 1 mounting unit 60, but the number of rollers 23 provided to 1 mounting unit may be two or 4 or more.

(2) In the first embodiment described above, all the rollers 23 are identical in shape, but rollers 23 of different shapes may be combined.

(3) In the first embodiment described above, the track guide 28 has the guide body portion 28a and the attachment portion 28b integrally formed, but may be joined by welding or the like after the guide body portion 28a and the attachment portion 28b are separately formed.

(4) In the first embodiment described above, the track frame 20 is a quadrangular or square pipe, but may be another polygonal or circular pipe. At this time, the support rod 32 fitted into the inside of the track frame 20 also has a suitable cross section corresponding to the inner cross section of the track frame 20.

(5) In the first embodiment described above, the mounting member 6 is constituted by a long plate member in common for a plurality of fixing screws 90, but may be a short plate member for one fixing screw 90, that is, only one female screw 6a is formed.

(6) In the first embodiment described above, the track frame 20 is fixed to the machine body 3, but the track frame 20 may be supported by the machine body frame 3 so as to be movable up and down via a pair of front and rear swing-operation support arms.

Second embodiment

A second embodiment of the present invention will be described below.

First, the overall structure of a general combine harvester according to a second embodiment of the present invention will be described with reference to fig. 9 to 11.

As shown in fig. 9 and 10, a conventional combine harvester has a crawler-type traveling body 101. A driving unit 102 is provided at the front of the traveling body 101. A threshing device 103 and a grain box 104 are provided in parallel in the left-right direction behind the driving unit 102. A cutting unit 105 is provided in front of the traveling body 101. A feeder 106 for feeding the cut straw to the threshing device 103 is provided at the rear of the cutting portion 105.

As shown in fig. 11, the feeder 106 delivers cut straw within a feeder box 107. A front rotary body 108 is rotatably supported at the front end of the feeder box 107. A rear rotary body 109 is rotatably supported at the rear end of the feeder box 107. A pair of left and right conveyor chains 110 are wound around the front side rotating body 108 and the rear side rotating body 109. A conveying plate 111 is provided in the pair of left and right conveying chains 110. The pair of left and right conveying chains 110 are rotated forward in the direction of arrow A1 by a forward rotation mechanism not shown, and are rotated reversely in the direction opposite to arrow A1 by a reverse rotation mechanism not shown.

Further, a dust suction port 170a is formed in the top plate 170 of the feeder box 107. A dust suction fan 112 that sucks dust in the feeder box 107 from the dust suction port 170a and discharges the dust to the outside is provided above the dust suction port 170a. The dust collection port 170a is provided with a catching member 120 which will be described in detail later.

Next, the dust collection fan 112 will be described with reference to fig. 12 to 14.

As shown in fig. 12 to 14, the suction fan 112 rotates around the axis X1 oriented in the left-right direction. The suction fan 112 is driven by a motor 113. The suction fan 112 is covered by a fan housing. The suction fan 112 is disposed near the left lateral end of the top plate 170 of the feeder box 107. The lower end of the rotation path of the suction fan 112 is located at (or near) the periphery of the suction port 170a. The end edge of the dust suction fan 112 on the downstream side in the dust flow direction is substantially flush with the outer surface of the cross plate portion 171 of the feeder box 107.

The fan housing 115 includes a suction side housing 116 and a discharge side housing 117. The suction side casing 116 is disposed upstream of the dust suction fan 112 in the dust flow direction. The discharge-side casing 117 is disposed downstream in the dust flow direction from the dust suction fan 112. The suction side casing 116 and the discharge side casing 117 are detachably coupled (detachably coupled) by bolts 118. The connection portion between the suction side housing 116 and the discharge side housing 117 is located on substantially the same plane as the outer surface of the cross plate portion 171 of the feeder box 107.

The lower end of the suction side case 116 is coupled to a stud 124 (corresponding to a "protrusion" of the present invention) protruding upward from the top 170 by a knob nut 125 (corresponding to a "fastener" of the present invention). A plurality of (e.g., four) studs 124 protrude upwardly from the top plate 170. Four bolt holes 116a through which the studs 124 are inserted are formed in the lower end of the suction side case 116. The lower end of the suction side case 116 is pressed from above by a pressing frame (corresponding to a "pressing member" of the present invention). In addition, a concave portion 116b that is concave toward the suction fan 112 is formed in a portion of the suction side case 116 that faces the suction fan 112.

The concave portion 116b is formed in a portion of the suction side housing 116 that faces the suction fan 112 in the direction of the axis X1. The concave direction of the concave portion 116b is the body lateral outside direction (left lateral outside direction).

The motor 113 is disposed upstream of the dust suction fan 112 in the dust flow direction. That is, the motor 113 inputs power from the upstream side in the dust flow direction with respect to the dust suction fan 112. The motor 113 is disposed between the suction port 170a and the suction fan 112. The motor 113 is separated from a dust flow path through which dust flows. Specifically, the motor 113 is covered with the cover 119 in a region where the recess 116b faces the suction fan 112. The motor 113 is supported so as to penetrate the concave portion 116b (the bottom of the concave portion 116 b).

Four bolt holes 126a through which the studs 124 are inserted are formed in the pressing frame 126. The pressing frame 126 is fastened to the stud 124 by a knob nut 125 together with the lower end of the suction side casing 16. That is, the pressing frame 126 is fastened to the stud 124 by the knob nut 125 together with the suction side housing 116 and the catching member 120. The circuit breaker 114 for the motor 113 is attached to the pressing frame 126 via an attachment stay 127. That is, the breaker 114 for the motor 113 is provided adjacent to the dust collection fan 112.

Next, the capturing section 120 will be described with reference to fig. 12 to 14.

As shown in fig. 12-14, the catching member 120 catches the straw flowing toward the suction fan 112. The catching member 120 is held by the top plate 170 of the feeder box 107 and the lower end of the suction side housing 116. The catching member 120 is configured to be detachable from the feeder box 107. Specifically, the catching member 120 is fastened to the stud 124 by a knob nut 125 in conjunction with the lower end of the suction side housing 116. The catching member 120 includes a plurality of (three in the present embodiment) round bars 121 (corresponding to the "rod-like members" of the present invention) and a pair of front and rear supporting frames 122 and 123.

The round bars 121 are disposed across the dust collection port 170a so as not to intersect each other. Specifically, the round bars 121 are arranged substantially parallel to the conveying direction (front-rear direction) of the feeder 106. And, the three round bars 121 are arranged at predetermined intervals (e.g., equal intervals) from each other. Gaps between adjacent ones of the three round bars 121 are formed across the entire length (front-rear direction) of the dust suction port 170 a. The round bar 121 is disposed only on the left side (laterally outside) of the width B in the left-right direction of the dust collection port 170 a. The round bars 121 are arranged so as not to protrude upward from the upper surface of the top plate 170 of the feeder box 107. That is, the round bar 121 is disposed on the lower surfaces of the pair of front and rear supporting frames 122 and 123.

A front and rear pair of support frames 122 and 123 are disposed on the upper surface of the top plate 170 of the feeder box 107. The front side support frame 122 of the front and rear pair of support frames 122 and 123 is disposed along the front side edge of the dust suction port 170 a. A bolt hole 122b through which a stud 124 is inserted is formed in the left end portion of the front support frame 122. A front fixing portion 122a is formed on the front support frame 122. The front fixing portion 122a protrudes from a front side edge of the suction port 170a toward a center side of the suction port 170 a. A tip end portion of the round bar 121 is fixed (e.g., welded or the like) to a lower surface of the front fixing portion 122a.

The rear support frame 123 of the front and rear pair of support frames 122 and 123 is disposed along the rear side edge of the suction port 170 a. A bolt hole 123b through which the stud 124 is inserted is formed in the left end portion of the rear support frame 123. A rear fixing portion 123a for fixing the rear end portion of the round bar 121 is formed on the rear support frame 123. The rear fixing portion 123a protrudes from a rear side edge of the dust suction port 170a toward a center side of the dust suction port 170 a. The rear end portion of the round bar 121 is fixed (e.g., welded, etc.) to the lower surface of the rear fixing portion 123a of the rear support frame 123.

With the above configuration, in the catching member 120, the three round bars 121 are disposed so as not to cross each other across the dust collection port 170 a. That is, in the catching member 120, gaps between adjacent ones of the three round bars 121 are formed across the entire length (front-rear direction) of the dust suction port 170 a. Therefore, the three round bars 121 are utilized to catch the straw flowing toward the suction fan 112, while the round bars 121 adjacent to each other among the three round bars 121 are less likely to be entangled with each other.

Other embodiments of the second embodiment

Hereinafter, another embodiment of the second embodiment of the present invention will be described.

(1) In the second embodiment described above, the pair of front and rear support frames 122 and 123 are provided on the capturing member 120, but for example, as shown in fig. 15, one end of the front support frame 122 and one end of the rear support frame 123 may be connected by the support frames. In this case, bolt holes are formed in the connecting portion between the one end of the front support frame 122 and the support frame, and in the connecting portion between the one end of the rear support frame 123 and the support frame, respectively. Although not shown, one end of the front side support frame 122 and one end of the rear side support frame 123 may be connected by a support frame, and the other end of the front side support frame 122 and the other end of the rear side support frame 123 may be connected by a support frame.

(2) In the second embodiment, the round bars 121 are arranged substantially parallel to the conveying direction of the feeder 106, but the round bars 121 may be arranged substantially orthogonal to the conveying direction of the feeder 106. The round bars 121 may be disposed obliquely to the conveying direction of the feeder 106.

(3) In the second embodiment, the "rod-like member" of the present invention is the round rod 121, but the "rod-like member" of the present invention may be a square rod (for example, a square rod having a quadrangular cross section).

(4) In the second embodiment, three round bars 121 are provided, but two or four or more round bars 121 may be provided.

(5) In the second embodiment described above, the number of studs 124 is four, but the number of studs 124 may be five or more.

(6) In the second embodiment described above, the "fastener" of the present invention is the knob nut 125, but the "fastener" of the present invention may be a wing nut.

(7) In the second embodiment described above, the suction side casing 116 and the discharge side casing 117 are detachably coupled by the bolts 118, but the bolts 118 may be knob bolts.

Third embodiment

A third embodiment of the present invention will be described below.

First, the overall configuration of the threshing device will be described with reference to fig. 16. In the following description, the threshing device sets the conveyance direction of the threshing processed object to the front-rear direction, the conveyance start-end-side direction to the front, and the conveyance end-side direction to the rear.

As shown in fig. 16, the threshing device threshes and sorts the straw. The threshing device includes a threshing unit 201 and a sorting unit 202. Incidentally, in the present embodiment, the threshing device is a device provided in a general type combine harvester, but may be a device provided in a semi-feeding type combine harvester.

The threshing unit 201 performs threshing of straw. The threshing unit 201 includes a threshing cylinder 203 for threshing straw. The threshing cylinder 203 is rotatably supported by the threshing chamber 204 via a rotation shaft 203a in the front-rear direction. The threshing unit 201 is provided with a receiving net 205 for allowing the threshing processed objects of the threshing cylinder 203 to leak down.

The sorting unit 202 sorts the threshing objects (the threshing objects leaked from the receiving net 205). The sorting unit 202 includes a swing sorting device 206, a wind mill 207, a first type collecting unit 208, and a second type collecting unit 209. The windmill 207 will be described in detail later.

The swing classifying device 206 performs swing classification of the threshing processed object (the threshing processed object leaked from the receiving net 205). The swing sorting apparatus 206 includes a screen box 210, a first grain tray 211, a first screen line 212, a second screen line 213, a second grain tray 214, a coarse screen 215, a first straw walker 216, a second straw walker 217, a third straw walker 218, and a grain screen 219. In addition, the first screen wire 212, the second screen wire 213, the first straw walker 216, the second straw walker 217, and the third straw walker 218 will be described in detail later.

The screen box 210 is configured to be swingable. That is, the screen box 210 swings in the front-rear direction by the eccentric cam type swing mechanism 220. The screen box 210 is provided with a first grain tray 211, a first screen line 212, a second screen line 213, a second grain tray 214, a coarse screen 215, a first straw walker 216, a second straw walker 217, a third straw walker 218, and a grain screen 219. Accordingly, the first grain pan 211, the first sieve line 212, the second sieve line 213, the second grain pan 214, the coarse sieve 215, the first straw walker 216, the second straw walker 217, the third straw walker 218, and the grain sieve 219 swing in the front-rear direction together with the sieve box 210.

The primary grain tray 211 sorts the threshing processed product by specific gravity difference. That is, the first grain tray 211 swings in the front-rear direction together with the sieve box 210, and as the threshing product is conveyed backward, the threshing product is vertically separated into straw chips and the like having a small specific gravity and grains and the like having a large specific gravity. The first grain pan 211 is formed in a substantially wave-like shape in a side view. A first screen wire 212 is fixed to a waveform portion located on the rearmost side of the waveform portions in the first grain pan 211. The first grain tray 211 is provided on the front end side of the sieve box 210 (only the front end portion of the sieve box 210). That is, the first cereal grain tray 211 is formed shorter than the first cereal grain tray 214 in side view.

Coarse screen 215 performs a drop-down sorting of the threshed treatment. That is, the coarse screen 215 has a plurality of angle-adjustable coarse screen plates 215a arranged at predetermined intervals in the front-rear direction. Further, the coarse screen 215 swings in the front-rear direction together with the screen box 210, whereby the rice straw chips and the like that have not leaked are conveyed rearward while the grains and the like leak down from between the coarse screen plates 215a. The angle of the roughing plate 215a is adjusted by an angle adjusting unit, not shown.

The coarse screen 215 is inclined so that the rear end side rises in a side view. Further, a coarse screen 215 is provided behind the second cereal grain tray 214. That is, the coarse screen 215 is disposed below the first screen line 212 and the second screen line 213. In other words, the coarse screen 215 is disposed in the screen box 210 rearward of the windmill 207.

The secondary cereal tray 214 sorts the threshing processed matters by specific gravity difference. That is, the second grain tray 214 swings in the front-rear direction together with the sieve box 210, whereby the threshing processed object is vertically layered into straw chips and the like having a small specific gravity and grains and the like having a large specific gravity while being conveyed rearward. The second grain pan 214 is formed in a substantially wave-like shape in a side view. Further, a waveform portion 214a deeper than other waveform portions in the second cereal grain tray 214 is formed on the front end side of the second cereal grain tray 214. That is, the wavy portion 214a is formed at the front end portion (forefront end portion) of the second cereal grain pan 214.

In addition, a second grain tray 214 is provided below the first grain tray 211. That is, a first cereal grain tray 211 different from the second cereal grain tray 214 is provided above the second cereal grain tray 214. The second cereal grain tray 214 and the coarse screen 215 are disposed at substantially the same height. The rear end portion of the second cereal grain tray 214 overlaps the front end portion of the coarse screen 215 (the roughing plate 215a located on the forefront side) in a plan view.

The grain sieve 219 performs the drop-out sorting of the threshing processed product. That is, the grain sieve 219 conveys the grain with the branch and the like, which is not leaked, as the second material, together with the straw chips and the like, while the single grain is leaked as the first material. The grain sieve 219 is disposed at a position behind the wind turbine 207 and below the coarse sieve 215. Further, a convex portion 219a protruding upward is provided on the tip end side of the grain sieve 219. For example, the convex portion 219a is formed of a plate-like member that is bent so as to protrude upward (substantially in a mountain shape).

The first type recycling portion 208 recycles the singulated grains as a first type, and the first type recycling portion 208 is disposed below the front portion of the sieve box 210.

The second type recovery unit 209 recovers grains with branches and the like as a second type substance, and the second type recovery unit 209 is disposed below the rear portion of the sieve box 210.

Next, the windmill 207 will be described with reference to fig. 17 to 21.

As shown in fig. 17 to 20, the windmill 207 includes a blade member 221, a fan housing 222, a first air passage 223, and a second air passage 224.

The blade member 221 is rotatably supported by the fan housing 222 via a rotation shaft 221a in the lateral direction. That is, the blade member 221 is rotatable about the axis X2 in the left-right direction. The rotation direction of the blade member 221 is counterclockwise (rotation direction A2 shown in fig. 2) in a side view. The blade member 221 is formed in a substantially circular arc shape recessed toward the upper hand side in the rotation direction (the side opposite to the rotation direction A2) in a side view. That is, the blade member 221 is formed in a substantially arcuate shape that bulges toward the hand side in the rotational direction (the side opposite to the rotational direction A2) in a side view. In the present embodiment, the plurality of (for example, four) blade members 221 are arranged at equal angular intervals (for example, 90 degrees) around the axis X2 in the lateral direction in a side view. The vane member 221 is fixed to the rotary shaft 221a via a plurality of (e.g., two) flange portions 221b formed in a substantially circular shape in side view.

The fan housing 222 is configured to cover the blade member 221. Further, suction ports 222a for sucking outside air are provided at both left and right side portions of the fan housing 222.

The suction port 222a is covered with an adjusting plate 225 capable of adjusting the opening degree thereof. The left adjustment plate 225 and the right adjustment plate 225 are connected by a single link rod 226. That is, the left and right adjusting plates 225 are configured to be swingable about the link rod 226 as a swing fulcrum. The left adjustment plate 225 is provided with a swing operation portion 227 for performing a swing operation of the left and right adjustment plates 225.

The swing operation portion 227 has a guide hole 228 formed in the left-hand adjustment plate 225, a guide shaft 229 inserted into the guide hole 228, and a nut 230 screwed to the guide shaft 229. Thus, when the left adjustment plate 225 swings along the guide shaft 229 via the guide hole 228, the right adjustment plate 225 also swings via the link rod 226. Thereby changing the opening degree of the suction port 222a on the left and right sides. That is, the opening degree of the suction port 222a on the left and right sides is changed by swinging the adjusting plates 225 on the left and right sides via the link rod 226. Further, the left adjustment plate 225 can be fixed to an arbitrary swing position by tightening the nut 230.

The separation wind supplied to the lower portion of the screen box 210 flows through the first wind path 223. The first air passage 223 is disposed below the wind turbine 207 and below the screen box 210. That is, the first air passage 223 communicates with the rear end side lower portion of the fan housing 222. A guide plate 233 is provided below the front side of the coarse screen 215 to guide the separation wind of the first wind path 223 upward.

The guide plate 233 is inclined to rise on the rear end side in side view. The inclination angle α1 of the guide plate 233 is substantially equal to the central angle α2 in the angle adjustment range β of the roughing plate 215a located on the forefront side (hereinafter referred to as "forefront roughing plate") among the plurality of roughing plates 215 a. That is, the inclination angle α1 of the guide plate 233 is substantially the same angle as the central angle α2 in the angle adjustment range β of the roughing plate 215a on the forefront side. It is also preferable that the inclination angle α1 of the guide plate 233 is identical (is the same angle) to the central angle α2 in the angle adjustment range β of the roughing plate 215a on the forefront side.

The classifying air supplied to the upper portion of the screen box 210 flows through the second air passage 224. The second air passage 224 is disposed above the wind turbine 207 and is a position in front of the screen box 210. That is, the second air passage 224 communicates with the front end side upper portion of the fan housing 222. The second air duct 224 is formed to extend forward and then turn backward in a U-shape, and supplies the classifying air to the front end side of the screen box 210. The upper portion of the second air passage 224 is formed by an upward inclined air passage 224a inclined so that the rear end side rises. A third air passage 232 through which the separated air from the second air passage 224 flows is formed in the screen box 210, and the third air passage 232 will be described in detail later.

A power transmission shaft 231 (see fig. 21) to which power from the engine E is transmitted is disposed above the second air passage 224. That is, the power transmission shaft 231 is disposed at the upper portion of the tip end side of the upward inclined air passage 224a of the second air passage 224. The power of the power transmission shaft 231 is transmitted to the threshing cylinder 203, the windmill 207, and the like.

The third air duct 232 is formed between the first and second cereal grain trays 211 and 214. The third air duct 232 is formed in a substantially V-shape in a side view by a downward inclined air duct 232a inclined to descend toward the rear end side and an upward inclined air duct 232b inclined to ascend toward the rear end side.

The inlet of the third air duct 232 (downward inclined air duct 232 a) is provided so as to extend over the front vertical wall (front wall) and the front lower wall of the screen box 210. The inlet of the third duct 232 (the downward inclined duct 232 a) may be provided only on the front vertical wall (front wall) of the screen box 210, or may be provided only on the front lower wall of the screen box 210.

The outlet portion of the third air duct 232 (the upward inclined air duct 232 b) is disposed below the rear end side of the first cereal grain tray 211. A second cereal grain pan 214 is provided below the outlet portion of the third air duct 232 (the upward inclined air duct 232 b). In particular, in the present embodiment, the tip portion of the second cereal grain pan 214 forms a part of the third air duct 232 (the bottom surface of the upward inclined air duct 232 b).

The inclination angle of the upward inclined air passage 232b of the third air passage 232 is substantially the same as the inclination angle of the first screen line 212 or/and the second screen line 213. Further, the inclination angle of the upward-inclination air passage 232b of the third air passage 232 is substantially the same as the inclination angle of the upward-inclination air passage 224a of the second air passage 224.

According to the above configuration, the separation wind is supplied to the upper and lower portions of the screen box 210 separately by the first wind path 223 and the second wind path 224, and thereby the separation wind can be spread from the lower portion to the upper portion of the screen box 210. Further, by supplying the separation wind to the front end side of the screen box 210 by the second wind path 224, the separation wind can be passed from the front end side to the rear end side of the screen box 210. As a result of forming the second air passage 224 in a U-turn, the air passage length of the second air passage 224 increases, and thus the flow of the sorted air tends to become laminar. Therefore, the separation wind having a stable flow can be supplied.

Next, the first screen line 212 and the second screen line 213 are explained by fig. 22 and 23.

As shown in fig. 22 and 23, the first screen wire 212 and the second screen wire 213 are provided side by side in the front-rear direction at the rear end portion of the first grain pan 211. The first screen line 212 and the second screen line 213 are disposed above the second cereal grain tray 214 and above the coarse screen 215. That is, the second screen wire 213 of the first screen wire 212 and the second screen wire 213 is arranged above the coarse screen 215 and overlaps the coarse screen 215 in a side view. A predetermined gap O is formed between the rear end portion of the first wire 212 and the front end portion of the second wire 213.

The gap O overlaps the front end side of the coarse screen 215 in a plan view. That is, the gap O overlaps the rear end portion of the second cereal grain pan 214 in a plan view.

For example, instead of the first screen line 212 and the second screen line 213, a hopper-by-straw device, a metal plate punched coarse screen, a mesh-like or metal plate punched grain screen, or other screen line-like screen section may be used. However, from the viewpoint of increasing the amount of leakage from the leakage separation section, it is preferable to use a screen wire.

The first screen wire 212 is formed in a substantially wave-like shape in a side view. For example, the first screen wire 212 is constituted by a piano wire. The first screen wire 212 is inclined so as to rise toward the rear end in a side view. The rear end side of the first screen wire 212 is disposed at a position higher than the front end side of the second screen wire 213. The first screen wire 212 is provided at the rear end of the first cereal grain tray 211. That is, the first screen wire 212 is fixed to the rear end portion (waveform portion located on the rearmost side) of the first cereal grain tray 211.

The second screen wire 213 is formed in a substantially wave-like shape in a side view. For example, the second screen wire 213 is constituted by a piano wire. The second screen wire 213 is inclined so as to rise toward the rear end in a side view. The second screen line 213 is inclined at a larger angle than the first screen line 212. The second screen line 213 is provided at a position higher than the first screen line 212. At least a part of the second wire 213 protrudes upward from the upper edge of the screen box 210. The second wire 213 is disposed above the front end side of the coarse screen 215, and at least a part thereof overlaps the front end side of the coarse screen 215 in a plan view. Further, the second screen wire 213 is disposed above the first type recovery portion 208, and at least a part thereof overlaps with the first type recovery portion 208 in a plan view.

According to the above configuration, the first screen wire 212 and the second screen wire 213 are formed in a substantially wave-like shape, and thus the first screen wire 212 and the second screen wire 213 can apply a feeding action to the threshing processed object. Therefore, the threshing processed objects from the first grain tray 211 can be smoothly conveyed by the first sieve line 212 and the second sieve line 213 and sorted at the same time.

Further, the first screen line 212 and the second screen line 213 extend above the coarse screen 215, whereby the threshing processed object roughly separated by the first screen line 212 and the second screen line 213 is supplied to the coarse screen 215. Accordingly, the sorting load applied to the coarse screen 215 can be reduced. In addition, if the sorting load applied to the coarse sieve 215 can be reduced, a large number of crops can be sorted without increasing the size of the coarse sieve 215 and thus the threshing device 215.

Next, the first straw walker 216, the second straw walker 217, and the third straw walker 218 will be described with reference to fig. 24 to 26.

As shown in fig. 24 to 26, the first straw walker 216 has a plurality of first shelves 216a arranged in the left-right direction with a predetermined interval G1 therebetween. The first straw walker 216 is provided at the rear end of the coarse screen 215. The rear end portion of the first straw walker 216 is arranged so as to overlap with the second straw walker 217 (second chassis fixing member 217 b) in a plan view.

The second straw walker 217 is arranged behind the first straw walker 216. The second straw walker 217 includes a plurality of second chassis 217a arranged with a predetermined gap G2 therebetween in the left-right direction, a second chassis fixing member 217b to which the distal ends of the plurality of second chassis 217a are fixed, and second wires 217c provided between adjacent second chassis 217 a. The rear end portion of the second straw walker 217 (second chassis 217 a) is arranged so as to overlap with the front end portion of the third straw walker 218 (third chassis fixing member 218 b) in a plan view.

A second screen wire 217c is fixed to the second chassis fixing member 217 b. That is, a second grill plate 217a is fixed to a lower surface of the second grill plate fixing member 217b, and a second screen wire 217c is fixed to an upper surface of the second grill plate fixing member 217 b.

The third straw walker 218 is arranged behind the second straw walker 217. The third straw walker 218 includes a plurality of third shelves 218a arranged with a predetermined gap G3 therebetween in the left-right direction, a third shelf fixing member 218b to which the distal ends of the plurality of third shelves 218a are fixed, and third screen wires 218c provided between adjacent third shelves 218 a.

A third screen wire 218c is fixed to the third frame plate fixing member 218 b. That is, a third grill plate 218a is fixed to the lower surface of the third grill plate fixing member 218b, and a third screen wire 218c is fixed to the upper surface of the third grill plate fixing member 218 b.

Here, as shown in fig. 24, the second straw walker 217 and the third straw walker 218 are longer than the first straw walker 216 in the front-rear direction. And, the second straw walker 217 and the third straw walker 218 are composed of the same member. The second straw walker 217 and the third straw walker 218 are disposed at the same height. And, the first straw walker 216 is disposed above the second straw walker 217 and the third straw walker 218. That is, the first straw walker 216 among the first straw walker 216, the second straw walker 217, and the third straw walker 218 is arranged highest.

In addition, as shown in fig. 25, the first straw walker 216 and the second straw walker 217 are arranged so as to overlap each other in a plan view. And, the second straw walker 217 and the third straw walker 218 are arranged to overlap each other in a plan view. The interval G2 of the plurality of second shelves 217a is the same as the interval G3 of the plurality of third shelves 218 a. The interval G1 of the first plurality of shelves 216a is larger than the interval G2 of the second plurality of shelves 217a and the interval G3 of the third plurality of shelves 218 a.

According to the above configuration, the threshing processed product from the rear end portion of the coarse screen 215 falls from the first straw walker 216 to the second straw walker 217, and the pieces of the threshing processed product are broken up by the impact when the pieces fall. The broken threshing processed product is sorted by the third straw walker 218 in addition to the second straw walker 217. Therefore, the recovery rate of grains can be improved for the threshing processed product from the rear end portion of the coarse sieve 215.

Fourth embodiment

A fourth embodiment of the present invention will be described below.

[ integral Structure of combine harvester ]

Hereinafter, an embodiment of the present invention applied to a wheel combine will be described with reference to the drawings. As shown in fig. 27, the combine 301 is a full-stalk feed type combine for harvesting crops such as rice and wheat. The combine 301 is equipped with a travelling unit 302 for supporting a body, a driving unit 303 located above the travelling unit 302, a harvesting unit 304 located in front of the driving unit 303, a threshing unit 305 located behind the body, and a storage unit 306 located above the threshing unit 305.

A traveling section 302 is provided with a pair of left and right front wheels 307 and rear wheels 308 as steering wheels, and a traveling transmission (not shown) for transmitting power from an engine to the pair of left and right front wheels 307 and rear wheels 308. A hydrostatic continuously variable transmission (corresponding to "transmission" and "first working unit". Hereinafter, referred to as "HST") is mounted in the traveling transmission.

The harvesting part 304 is provided with a harvesting blade 360 for harvesting stalks of crops. The cutting unit 304 swings around the swing fulcrum P by extension and contraction of a hydraulic cylinder, not shown, and moves up and down. The harvesting unit 304 is provided with a raking drum 361, and the raking drum 361 rotates about a left-right axis, not shown, to pull up the crop and raking the harvested stalks rearward. The drag roller 361 swings around a swing fulcrum Q by the expansion and contraction of a hydraulic cylinder, not shown, and moves up and down.

[ concerning the driver's cab ]

As shown in fig. 28 and 29, the driving unit 303 is provided with: a driver's seat 310 disposed in the center of the body; a main shift lever 311 (corresponding to an "operation lever") supported by a lever case 313 disposed on the right side of the driver's seat 310, and capable of instructing a shift operation to the HST; and a steering wheel 314. By operating the steering wheel 314, the rear wheels 308 as steered wheels can be steered.

As shown in fig. 28, 30, and 32, a rod guide 350 is formed on the upper surface of the rod box 313. The main shift lever 311 is inserted through the lever guide 350, supported inside the lever housing 313, and is swingably operated along the lever guide 350. The main shift lever 311 is located near the driver's seat 310 (obliquely right-ahead of the operator D). The rod guide 350 has an on-road travel region D1, a work region D2, and a reverse region R formed in this order from the front. The lever box 313 is configured such that the lever guide 350 is located at substantially the same height as the seat surface 318 of the driver's seat 310.

As shown in fig. 30, when the combine 301 is driven on a road outside the field, the main shift lever 311 is operated so as to be located in the road driving region D1. When the combine 301 is subjected to a harvesting operation in the field, the main shift lever 311 is operated to be located in the work area D2. When the combine 301 is retracted, the main shift lever 311 is operated to be located in the retraction region R. In the road traveling area D1 and the work area D2, the traveling speed of the machine body increases as the main shift lever 311 is pushed forward. In the reverse region R, the speed of the machine body reverse increases as the main shift lever 311 is pushed backward. In this way, the travel speed of the machine body is adjusted by pushing and pulling the main shift lever 311 forward and backward.

The upper surface of the pole box 313 is formed to be curved upward, and the work area D2 is located at the topmost portion of the pole box 313. As described above, the lower the main shift lever 311 is (the position away from the body), and the arm can be extended without being restrained, as compared with the case where the upper surface of the lever housing 313 is formed as the horizontal surface. Further, as shown in fig. 28, since the work area D2 with a high frequency of use is located slightly forward of the operator, the cutting operation can be performed in a comfortable posture when the main shift lever 311 is operated to the work area D2.

As shown in fig. 30, a seesaw switch 334 (corresponding to the "first command input mechanism") and a seesaw switch 337 (corresponding to the "second command input mechanism") are provided on the main shift lever 311. The operation of the hydraulic cylinder for lifting and lowering the cutting unit 304 is instructed by the input operation of the seesaw switch 334. That is, the hydraulic cylinder that lifts the cutting unit 304 constitutes a cutting lifting control unit (corresponding to the "second working unit"). Further, the operation of the hydraulic cylinder for lifting and lowering the drag roller 361 is instructed by the input operation of the seesaw switch 337. That is, the hydraulic cylinder for lifting and lowering the drag drum 361 constitutes a drum lifting control unit (corresponding to a "third working unit").

[ shape of Main Shift lever ]

The main shift lever 311 is made of resin, and is supported by a lever case 313 via a metal lever 321 as shown in fig. 31. The main shift lever 311 has a grip portion 322 and a shaft portion 323 supporting the grip portion 322.

As shown in fig. 31, the shaft portion 323 is provided with a through hole 346 through which the seesaw switch 334 and the harness 345 of the seesaw switch 337 are inserted, and a through hole 347 of the through rod 321. As shown in fig. 33, the insertion hole 346 for the harness 345 and the insertion hole 347 for the rod 321 are provided in a superimposed state.

A predetermined gap 344 is provided between the bottom surface of the shaft portion 323 and the lever guide 350 of the lever housing 313 in the up-down direction to avoid interference between the main shift lever 311 and the lever housing 313. A lower end bulge 343 bulging in the outer circumferential direction is formed at the lower end of the shaft portion 323. Even if the gap 344 is large, the harness 345 and the rod 321 are prevented from being completely seen from the gap 344 by the lower end bulge 343. That is, even when the gap 344 is set large and the assembly accuracy is set not too high when the main shift lever 311 is assembled to the lever 321, the assembly is excellent in appearance.

As shown in fig. 30, the grip portion 322 is formed integrally in a rounded transverse shape. The grip portion 322 includes a first surface 324, a second surface 326 that is a surface different from the first surface 324, an upper surface 327 that is a surface different from the first surface 324 and the second surface 326, and a back surface 331 that is located on the opposite side of the second surface 326. The surface of the grip portion 322 has a rounded shape except for the first surface 324. Therefore, when the index finger f, the middle finger m, the ring finger r, and the little finger p are positioned on the second face 326 or the upper surface 327, the hand H is easily adapted to the main shift lever 311.

The grip portion 322 is formed to have a lateral width wider than the width of the hand H in plan view. That is, the grip 322 is formed to have a larger width in the direction along the second surface 326 than the first surface 324.

The first face 324 is a face on which the thumb t is disposed. As shown in fig. 28, 30, and 31, the first surface 324 is formed in a substantially planar shape, and is inclined so as to be located farther forward in a top view than in a left-right center line X of the driver seat 310, i.e., so as to be located farther forward from the operator D in a top view. The boundary portion of the first surface 324 and the second surface 326, the boundary portion of the first surface 324 and the upper surface 327, and the boundary portion of the first surface 324 and the rear surface 331 are formed in a slightly angular shape. The seesaw switch 334 is provided on the first surface 324.

A cutout 325 is formed in a portion that spans the portion of the first surface 324 near the operator D side and the rear surface 331. The cutout portion 325 is formed in a portion of the first surface 324 near the operator D side. The cutout portion 325 is formed in a triangular shape that is widened at the end from the rear surface 331 side toward the first surface 324, and is formed in a rounded shape that is curved toward the lever center side of the main shift lever 311 in correspondence with the shape of the thumb t. Thus, in order to operate the seesaw switch 334, the cutout 325 serves as a guide for the thumb t when the thumb t is operated by swinging around the finger root.

The second surface 326 is a surface on which the index finger f, the middle finger m, the ring finger r, and the little finger p are disposed. The second surface 326 is formed in a rounded shape as a whole, and is inclined so as to be located rearward as it is farther rightward from the left-right center line X in a plan view. That is, the second surface 326 is inclined so as to be located farther rearward from the operator D in a plan view. The second face 326 is formed to be slightly rounded and continuous with the upper surface 327. The second surface 326 is provided with the seesaw switch 337.

As shown in fig. 28, an outer bulge 328, a concave portion 329, and an inner bulge 330 are formed in the second surface 326 in order of approaching the left-right center line X.

As shown in fig. 28, 29, and 31, an end portion of the outer bulge 328 on the side away from the operator D in the grip 322 is formed at an upper end portion of the second surface 326 (a boundary portion between the second surface 326 and the upper surface 327). The upper end portion of the outer bulge 328 is formed continuously with the front end portion of the upper surface 327. The outer bulge 328 is formed in a circular arc shape curved forward (more precisely, slightly obliquely rightward and forward away from the body of the operator D) in a plan view. When the hand H is placed on the main shift lever 311, the ring finger r and the little finger p can be bent to be caught by the outer bulge 328, and slipping of the hand H can be prevented when the main shift lever 311 is pulled and operated.

As shown in fig. 28, 29 and 31, the concave portion 329 is formed continuously with the left side of the outer bulge 328. The recessed portion 329 is formed in a shape recessed from the upper end portion of the upper surface 327 toward the rear surface 331 side to the lower end portion of the second surface 326. The index finger f can be positioned in the concave portion 329, and the concave portion 329 becomes a grip portion when the main shift lever 331 is gripped.

As shown in fig. 28, 29 and 31, the inner bulge 330 is formed continuously with the left side of the concave portion 329. The inner bulge 330 is formed by bulge of a portion that spans the first surface 324 and the second surface 326 toward the front (more precisely, toward the right and obliquely front slightly away from the body of the operator D). The upper end of the inner bulge 330 is formed continuously with the front end of the upper surface 327. The inner bulge 330 is formed in a shape protruding forward in front view. The inner bulge 330 can hold the index finger f, and can prevent the hand H from slipping when the main shift lever 331 is pulled.

By configuring the outer bulge 328, the concave portion 329, and the inner bulge 330 in this manner, the above portions become grasping portions when the main shift lever 331 is grasped, and the index finger f, the middle finger m, the ring finger r, and the little finger p are firmly positioned, so that the position of the hand H is stabilized. In addition, since the position of the hand H is stable, the main shift lever 311 can be firmly held, thereby improving the operability of the main shift lever 311.

The upper surface 327 is mainly a surface on which the palm P1 is placed. As shown in fig. 29 and 31, the upper surface 327 is inclined so as to be located downward further to the right than to the left and right center lines X in the body. That is, the upper surface 327 is inclined so as to be positioned further down than the operator D. The boundary portion of the upper surface 327 and the rear surface 331 is formed to be continuous with roundness.

The rear surface 331 is a surface against which the palm P1 mainly abuts when the pushing operation of the main shift lever 311 is performed. As shown in fig. 30, the rear surface 331 is formed with roundness so as to be slightly curved toward the driver's seat 310 side, and is formed adjacent to the upper surface 327 and the first surface 324, on the opposite side of the second surface 326. As shown in fig. 28, the rear surface 331 is inclined so as to be located rearward further to the right than the left-right center line X. The rear surface 331 is formed in a substantially flat shape facing obliquely upward and leftward near its lower end. The end of the grip portion 322 on the side away from the driver's seat 310, that is, the boundary portion between the second surface 326, the upper surface 327 and the rear surface 331 is formed in a shape that bulges substantially hemispherical toward the right obliquely rearward side.

Further, a split surface, not shown, is formed at a position of the grip 322 at which the insertion rod 321 is avoided. The grip portion 322 can be divided into two parts by the dividing surface. If the grip portion 322 is divided, maintenance of the harness 345 and the rod 321 housed inside the grip portion 322 can be performed easily.

[ configuration of switch ]

As shown in fig. 30-32, a rocker switch 334 is disposed on the first face 324. The seesaw switch 334 is mounted slightly to float upward from the first surface 324 via a resin base 335. The seesaw switch 334 is formed on a side portion of the grip portion 322 near the operator D side. The seesaw switch 334 has one knob 334A and another knob 334B formed continuously with the one knob 334A. The seesaw switch 334 is an instantaneous switch configured to return to a neutral position automatically when the pressing of one knob 334A or the other knob 334B is released.

As shown in fig. 30, when at least the main shift lever 311 is positioned in a front side region (region used in a normal cutting operation) of the work region D2, the seesaw switch 334 is disposed in a state in which one knob 334A is positioned above the other knob 334B so as to be tilted forward as going from below to above. The seesaw switch 334 is inclined such that the direction in which one knob 334A and the other knob 334B are aligned is along a tangential direction of a circumference (tangential direction at the approximate center of the swing locus (circular arc) of the distal end portion of the thumb t) centered at the apex of the rear side of the cutout portion 325 (approximate triangle). That is, the seesaw switch 334 is arranged such that the tilt direction of the seesaw switch 334 is along the swing direction of the thumb t. Therefore, the operation of one knob 334A or the other knob 334B can be easily performed by the thumb t. In particular, in a state in which the main shift lever 311 is located in the front side region (normal cutting operation region) of the operation region D2 and the tip is slightly tilted forward with respect to the wrist L, the seesaw switch 334 is disposed so as to tilt forward as going upward from below, and therefore the thumb t does not take an uncomfortable posture during the swinging operation, and the operation of the seesaw switch 334 is easy.

When one knob 334A is swung by pressing, the harvest portion 304 is raised, and when the other knob 334B is swung by pressing, the harvest portion 304 is lowered. That is, the seesaw switch 334 is configured to input an operation command to the cutting unit 304 when one knob 334A is pressed, and to input an operation command to the cutting unit 304 opposite to the operation command when the other knob 334B is pressed. When the pressing of one knob 334A or the other knob 334B is released, the lifting of the cutting unit 304 is stopped.

Further, the raising of the cutting unit 304 is achieved by operating the knob 334A located above, and the lowering of the cutting unit 304 is achieved by operating the knob 334B located below, so that the raising and lowering operation of the cutting unit 304 is perceptively linked to the operation of the seesaw switch 334, and the knobs 334A and 334B can be quickly selected, and a selection error between the knobs 334A and 334B is less likely to occur.

As shown in fig. 31, the seesaw switch 337 is disposed at a position slightly apart from the outer bulge 328 (a position slightly apart from the upper surface 327) in the second surface 326 downward. That is, the seesaw switch 337 is disposed at a position which is difficult to reach when the middle finger m and the ring finger r are slightly bent, but which is sufficient when the middle finger m and the ring finger r are intentionally extended. The seesaw switch 337 is slightly mounted to float upward from the second surface 326 via a resin mount 338. The seesaw switch 337 is formed at a side portion of the grip portion 322 away from the operator D side. The seesaw switch 337 has one knob 337A and another knob 337B formed continuously with the one knob 337A.

As shown in fig. 30, the seesaw switch 337 is disposed in a state of being inclined such that one knob 337A is located above the other knob 337B. The seesaw switch 337 is inclined in the inclined direction of the upper surface 327. The seesaw switch 337 is an instantaneous switch configured to return to a neutral position automatically when the pressing of one knob 337A or the other knob 337B is released.

When one knob 337A is swung by pressing, the drag roller 361 rises. When the other knob 337B is swung by pressing, the drag roller 361 is lowered. That is, the seesaw switch 337 is configured to input an operation command to the drag roller 361 when one knob 337A is pressed, and to input an operation command to the drag roller 361 opposite to the command when one knob 337A is pressed when the other knob 337B is pressed. When the pressing of one knob 337A or the other knob 337B is released, the elevation of the drag roller 361 is stopped.

Further, by operating the knob 337A located on the body side close to the operator D to raise the drag roller 361 (the movement close to the body of the operator D), and by operating the knob 337B located on the body side far from the operator D to lower the drag roller 361 (the movement far from the body of the operator D), the raising and lowering movements of the drag roller 361 are perceptively linked to the operation of the seesaw switch 337, whereby the knobs 337A and 337B can be quickly selected, and a selection error between the knobs 337A and 337B is less likely to occur.

[ concerning the operation method of the main shift lever 311 ]

When performing work in the field, the main shift lever 311 is operated so as to be located in the work area D2.

When the engine body is accelerated, the back surface 331 is pushed forward by the palm P1, and the main shift lever 311 is pushed forward. At this time, since it is not necessary to apply a large force to the thumb t, the index finger f, the middle finger m, the ring finger r, and the little finger p, the operation of the seesaw switch 334 by the thumb t and the operation of the seesaw switch 337 by the middle finger m and the ring finger r can be performed.

On the other hand, when the machine body is decelerated, the index finger f, the middle finger m, the ring finger r, and the little finger p are hooked to the second surface 326 and pulled, whereby the main shift lever 311 is pulled and operated rearward. At this time, since it is not necessary to apply a large force to the thumb t, the middle finger m, and the ring finger r, the operation of the thumb t on the seesaw switch 334 and the operation of the middle finger m and the ring finger r on the seesaw switch 337 can be performed. At this time, the seesaw switch 337 is located at a position on the second surface 326 that is difficult to reach when the middle finger m and the ring finger r are slightly bent, but is reached when the middle finger m and the ring finger r are intentionally extended, so that erroneous operation of the seesaw switch 337 accompanying the pulling operation of the main shift lever 311 is prevented.

Therefore, the operator can operate the seesaw switch 334 with the thumb t to raise and lower the cutting unit 304 or operate the seesaw switch 337 with the middle finger m and the ring finger r to raise and lower the drag roller 361 while accelerating or decelerating the body by pushing or pulling the main shift lever 311.

For example, when harvesting a lodged crop, it is preferable to appropriately change the harvesting height of the crop stalks by the harvesting blade 360 of the harvesting unit 304 and the height of the raking action of the raking drum 361 on the harvested stalks while decelerating and adjusting the advancing speed of the machine body according to the lodged state of the crop. In the main shift lever 311 of this configuration, such a work can be easily performed by one-hand operation.

When switching between travel on the road outside the field, travel during work in the field, and reverse, the main shift lever 311 moves between the road travel region D1, the work region D2, and the reverse region R.

When the main shift lever 311 is moved from the road traveling region D1 to the work region D2 and from the reverse region R to the work region D2, the main shift lever 311 is pressed leftward. At this time, the index finger f can be caught by the inner bulge 330, and thus the index finger f does not slip. Further, the outward bulge 328 is held by the ring finger r and the little finger p, and thus the force is easily applied.

When the main shift lever 311 is moved from the work area D2 to the reverse area R and when the work area D2 is moved to the road traveling area D1, the main shift lever 311 is pressed rightward. At this time, the finger root of the thumb t can be hooked to the notch 325, and thus slipping of the thumb t can be prevented. Further, the outward bulge 328 is held by the ring finger r and the little finger p, and thus the force is easily applied.

Other embodiments of the fourth embodiment

(1) In the fourth embodiment described above, the second working unit is the harvest control unit configured by a hydraulic cylinder for lifting the harvest unit 304, and the third working unit is the roll lifting control unit configured by a hydraulic cylinder for lifting the raking roll 361, but the present invention is not limited thereto. For example, the second working unit may be a reel lifting control unit, and the third working unit may be a cutting lifting control unit. The second working unit or the third working unit may be another working unit different from the cutting/lifting control unit and the spool lifting control unit.

(2) In the fourth embodiment, the description has been made about a general combine harvester, but a corn harvester for harvesting corn may be used. For example, as shown in fig. 34, a harvesting unit 402 for harvesting a field crop and a rotary chopper 403 for pulverizing stalks left in the field after harvesting the crop are provided in a corn harvester 401.

The harvesting unit 402 swings around the swing fulcrum P2 by the extension and contraction of the hydraulic cylinder 404, and moves up and down. The second working unit is a harvesting lifting control unit constituted by a hydraulic cylinder 404 that lifts and lowers the harvesting unit 402. For example, the harvesting unit 402 may be configured to swing up and down based on the operation of the seesaw switch 334 provided in the main shift lever 311.

In this case, the raising of the harvesting unit 402 may be realized by operating the upper knob of the seesaw switch 334, and the lowering of the harvesting unit 402 may be realized by operating the lower knob of the seesaw switch 334. Thus, the lifting operation of the harvesting portion 402 is perceptively linked to the operation of the seesaw switch 334, and the knob can be quickly selected, and a selection error of the knob is less likely to occur.

The rotary chopper 403 is vertically movable about a left-right axial center in the machine body. The rotary chopper 403 swings around the swing fulcrum P3 by the expansion and contraction of the hydraulic cylinder 405, thereby being lifted up and down. The third working unit is a rotary shredder lifting control unit constituted by a hydraulic cylinder 405 for lifting the rotary shredder 403. For example, the swing up/down of the rotary chopper 403 may be performed based on the operation of the seesaw switch 337 provided in the main shift lever 311.

In this case, the raising (the action close to the body of the operator D) of the rotary chopper 403 may be realized by operating a knob located above (on the side close to the body of the operator D) of the seesaw switch 337, and the lowering (the action far from the body of the operator D) of the rotary chopper 403 may be realized by operating a knob located below (on the side far from the body of the operator D) of the seesaw switch 337. Thus, the up-and-down operation of the rotary chopper 403 is perceptively linked to the operation of the seesaw switch 337, and the knob can be quickly selected, and a selection error of the knob is less likely to occur.

In this case, the second working unit is a harvesting lifting control unit constituted by a hydraulic cylinder 404 for lifting the harvesting unit 402, and the third working unit is a rotary chopper lifting control unit constituted by a hydraulic cylinder 405 for lifting the rotary chopper 403.

(3) In the fourth embodiment described above, the notched portion 325 is formed in the grip portion 322, but the grip portion may be a grip portion in which the notched portion 325 is not formed.

(4) The grip 322 is formed to have a larger width in the direction along the second surface 326 than the first surface 324 in a plan view, but may be formed to have a larger width in the direction along the first surface 324 than the second surface 326 in a plan view.

(5) In the fourth embodiment described above, the upper surface 327 of the grip portion 322 is inclined so as to be positioned downward as it is farther from the operator D, but the present invention is not limited thereto. The upper surface may be a grip portion arranged in a substantially horizontal state.

(6) In the fourth embodiment described above, the outer bulge 328, the concave portion 329, and the inner bulge 330 are formed in the grip portion 322, but the grip portion may be one in which the outer bulge 328, the concave portion 329, and the inner bulge 330 are formed arbitrarily.

(7) In the fourth embodiment described above, the lever guide 350 that guides the main shift lever 311 is provided at substantially the same height position as the seat surface 318 of the driver's seat 310, but the lever guide 350 may be provided at a different height position from the seat surface 318 of the driver's seat 310.

(8) In the fourth embodiment described above, the shaft portion 323 of the main shift lever 311 is provided with the see-saw switch 334, the insertion hole 346 for the harness 345 of the see-saw switch 337, and the insertion hole 347 for the lever 321 supporting the main shift lever 311, but is not limited thereto. The electric wire 345 may be wound around the outside of the main shift lever 311.

(9) In the fourth embodiment described above, the first surface 324 is inclined so as to be located farther forward from the operator D in a plan view, but the first surface 324 may be formed as a surface substantially parallel to the front-rear direction of the machine body.

(10) In the fourth embodiment described above, the insertion hole 346 for the harness 345 and the insertion hole 347 for the rod 321 are provided in the grip 322 in a superimposed state, but the insertion hole 346 for the harness 345 and the insertion hole 347 for the rod 321 may be provided independently without being superimposed.

(11) In the fourth embodiment described above, the lower end bulge 343 is formed in the grip portion 322, but the grip portion may be one in which the lower end bulge 343 is not formed.

(12) In the fourth embodiment described above, the steering wheel 314 is provided in the steering section 303, but other steering supports may be provided in place of the steering wheel 314, such as a steering lever.

(13) In the fourth embodiment described above, the raising of the harvesting unit 304 is performed by operating the knob 334A and the lowering of the harvesting unit 304 is performed by the knob 334B, but the present invention is not limited thereto. For example, the following reverse constitution may be adopted: the raising of the harvesting portion 304 is achieved by operating the knob 334B, and the lowering of the harvesting portion 304 is achieved by the knob 334A.

(14) In the fourth embodiment described above, the raising of the drag roller 361 is performed by operating the knob 337A and the lowering of the drag roller 361 is performed by the knob 334B, but the present invention is not limited thereto. For example, the drag roller 361 may be raised by operating the knob 337B, and the drag roller 361 may be lowered by operating the knob 334A.

(15) In the fourth embodiment described above, the first command input means is the seesaw switch 334, and the second command input means is the seesaw switch 337, but this is not a limitation. For example, the first command input means and the second command input means may be provided as two push-button switches for instructing opposite operations. The first command input means and the second command input means may be one push button switch for performing two different commands by a short-press operation and a long-press operation, respectively.

(16) In the fourth embodiment described above, the main shift lever 311 is described as an example of the operation lever, but the present invention can also be applied to a sub shift lever.

(17) In the fourth embodiment described above, an example in which the traveling portion 302 is constituted by a plurality of wheels is shown, but the traveling portion 302 may be constituted by a crawler apparatus.

(18) In the fourth embodiment described above, the example in which the main shift lever 311 is disposed on the right side of the driver seat 310 has been shown, but may be disposed on the left side.

(19) In the fourth embodiment described above, the rear wheels 308 are steering wheels, but the front wheels 307 may be steering wheels.

Industrial applicability

The present invention can be applied to a crawler travel device provided in a general type combine having a threshing device for feeding a root side of a grain harvesting straw into a threshing chamber together with a spike side, in addition to a combine having a half-feed type threshing device. In addition to the combine harvester, the present invention can be applied to a crawler travel device equipped in a harvester, a tractor, a backhoe, or a work vehicle such as a carrier vehicle, which is a harvesting target of crops other than straw such as green onions and carrots.

Description of the reference numerals

1: crawler travel device

3: frame of machine body

6: mounting part (reinforcing plate)

6a: internal thread

8: roller shaft

10: cutting and picking part

11: driver's seat

12: threshing device

17: gear box

20: track frame

21: driving sprocket

22: tensioning sprocket

23: roller wheel

26: caterpillar band

25: guiding wheel

27: cross beam

28: track guide

30: advancing and retreating mechanism

31: holding unit

31a: side plate

31b: base seat

32: support rod

33: adjusting screw mechanism

33a: adjusting screw

33b: first screw body receiving part

33c: second screw body receiving part

60: mounting unit

60A: channel shaped member

60B: boss part

61: side plate portion

62: bottom plate part

63: mounting unit for guide wheel

63a: bracket plate

80: ball bearing

81: sealing member

82: bleeder member

90: fixing bolt

91: backing plate

106: feeder

107: feeder box

112: dust suction fan

113: motor with a motor housing

114: circuit breaker

115: fan shell

120: catching component

121: round bar (stick shape component)

124: stud (protruding part)

125: knob nut (fastener)

126: pressing frame (pressing component)

170: top plate

170a: dust collection port

207: windmill

208: first-class recovery unit

210: screen box

211: first cereal tray (cereal tray)

212: first screen line (screen line, under-screen sorting part)

213: second screen line (screen line, under-screen sorting part)

214: second cereal tray

215: coarse screen

221: blade part

222: fan shell

223: first air path

224: second air path

232: third air path

301: combine harvester

308: rear wheel

310: driver's seat

311: main gear lever (operating lever, gear lever)

313: pole box

314: steering wheel

318: seat surface

321: rod

322: holding part

323: shaft portion

324: first surface

325: cut-out part

326: a second surface

327: upper surface of

328: outer bulge

329: concave portion

330: inner bulge part

334: seesaw switch (first instruction input mechanism)

337: seesaw switch (second instruction input mechanism)

343: lower end bulge

345: electrical wiring

346: through jack

347: through jack

350: rod guide

401: corn harvester

402: harvesting part

403: rotary chopper

404: hydraulic cylinder (harvesting lifting control part, second operation part)

405: hydraulic cylinder (lifting control part of rotary chopper, third working part)

D: operator(s)

A: arm

H: hand with a handle

O: gap of

P: palm

X1: axle center

t: thumb

f: index finger

m: middle finger

r: ring finger

P: little finger.

Claims

1. A threshing device, comprising:

a screen box;

a grain tray provided on the conveyance start end side of the screen box,

a screening line arranged at the conveying terminal part of the grain tray,

a windmill for supplying a classifying air to the screen box;

a first air passage formed in the wind turbine and through which the separation air supplied to the lower portion of the screen box flows;

A second air passage formed in the wind turbine and through which the separation air supplied to the upper portion of the screen box flows,

a first type recovery part is arranged below the screen box,

the plurality of screen lines are arranged in the screen box in a conveying direction at positions on the conveying terminal side of the grain tray and above the first type recovery part,

among the plurality of the above-mentioned wires, a predetermined gap is formed between a conveying terminal portion of one wire adjacent in the conveying direction and a conveying start portion of the other wire,

in the screen box, a coarse screen is arranged below the screen wire,

the gap overlaps with a conveyance start end side of the coarse screen in a plan view.

2. Threshing device as claimed in claim 1, characterized in that,

the second air passage supplies a separation air to a conveyance start end side of the screen box.

3. Threshing device as claimed in claim 1 or 2, characterized in that,

the screen wire is formed in a substantially wave-like shape in a side view, and is inclined so that a conveying terminal side rises in a side view.

4. Threshing device as claimed in claim 1 or 2, characterized in that,

a plurality of the screen wires are inclined upward at the conveying terminal side in a side view,

Among the plurality of the wires, a conveyance end side of the wire on a conveyance start side is provided at a position higher than a conveyance start side of the wire on a conveyance end side.

5. Threshing device as claimed in claim 1 or 2, characterized in that,

the plurality of screen wires are inclined so as to rise upward on the conveyance terminal side in a side view, and the inclination angle of the screen wires on the conveyance terminal side is larger as the screen wires are on the conveyance terminal side.

6. Threshing device as claimed in claim 1 or 2, characterized in that,

the second air passage is formed to extend in a direction toward a conveyance start end side and to make a U-turn in a direction toward a conveyance end side.

7. Threshing device as claimed in claim 1 or 2, characterized in that,

a third air path through which the separation air from the second air path flows is formed in the screen box.

8. Threshing device as claimed in claim 1 or 2, characterized in that,

the windmill includes a blade member rotatable about an axis orthogonal to a conveying direction in plan view, and a fan housing covering the blade member,

the front wall portion of the fan housing is formed in a shape of a rotation locus drawn along the tip end of the blade member, and the upper wall portion of the fan housing is formed in a shape that is separated from the rear side toward the front side in the conveying direction toward the radial outside of the rotation locus,

The rotation direction of the blade member is set to be counterclockwise when viewed from the left side, and the fan housing is communicated to the second air passage via a space between the upper end of the front wall portion and the front end of the upper wall portion.

9. Threshing device as claimed in claim 8, characterized in that,

the upper wall portion of the fan housing is inclined so as to descend in a conveying start end side over a top portion of the fan housing,

the second air passage is inclined as a whole in a state where a conveyance start end side is lowered, and extends along the upper wall portion of the fan housing.

10. A threshing device as claimed in claim 6, wherein,

the inlet portion of the second air passage is formed in a state of communicating with the fan housing at a position on a front side in a conveying direction than the axial center of the blade member,

an upper wall and a lower wall are provided on a rear side portion of the second air passage toward the transfer end side in the transfer direction, a transfer start end side portion of the lower wall is located on a front lower side than a top portion of the fan housing,

A front vertical wall part is arranged at the forefront end part of the screen box in the conveying direction, an opening is formed on the front vertical wall part,

the front vertical wall portion is located at a position on a rear side in a conveying direction from the axial center of the blade member,

the second air path extends to the opening.

11. Threshing device as claimed in claim 1 or 2, characterized in that,

a coarse screen is arranged below the screen line in the screen box,

the screen wire on the conveyance end side of the plurality of screen wires is disposed above the conveyance start side of the coarse screen, and at least a part thereof overlaps the conveyance start side of the coarse screen in a plan view.

12. Threshing device as claimed in claim 1 or 2, characterized in that,

at least a part of the screen wire protrudes upward from the upper edge of the screen box.

13. Threshing device as claimed in claim 1 or 2, characterized in that,

the grain tray is provided only at a conveyance start end portion of the screen box.