CN106465605B

CN106465605B - Combine harvester

Info

Publication number: CN106465605B
Application number: CN201610465815.6A
Authority: CN
Inventors: 米田豊; 富永俊夫; 松本健; 佐岛圭介; 下田洋平
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2015-08-21
Filing date: 2016-06-23
Publication date: 2021-04-30
Anticipated expiration: 2036-06-23
Also published as: CN106465605A; KR102567231B1; KR20170022862A; JP6523865B2; JP2017038577A

Abstract

The invention provides a combine harvester, which can reduce labor load when performing posture switching operation in a structure capable of switching the posture of an engine cover. The combine harvester is provided with an engine hood (35) covering the upper part of an engine (34), an exhaust gas treatment device (58) for purifying the exhaust gas of the engine (34), a support member (38) erected from a body frame (37) into a cylindrical shape, and a rotation fulcrum member (40) integrally connected to the engine hood (35) and extending in the vertical direction, wherein the engine hood (35) is configured to be capable of switching the posture between a retreat posture and an extension posture by enabling the rotation fulcrum member (40) to be rotatably supported around an upper and lower axial center (Y1) in a state of being inserted into the support member (38) from the upper part, and the exhaust gas treatment device (58) is supported by the support member (38).

Description

Combine harvester

Technical Field

The invention relates to a combine harvester.

Background

In a conventional combine harvester, there is a combine harvester in which an engine hood is configured to be switchable between a retracted posture located inside a machine body and an extended posture extending outward in a lateral direction of the machine body. That is, a strut for rotatably supporting the hood is erected from the body frame, and the strut is formed long in the vertical direction and has a small-diameter shaft portion formed at an upper end portion. A tubular pivot member is provided on the hood side, a lower end portion of the pivot member is rotatably fitted and supported in a shaft portion formed on an upper portion of the support post, and an upper end portion of the pivot member is rotatably supported by a support member coupled to the threshing device (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent application publication No. 2010-75118

In the above-described conventional structure, the upper end portion and the lower end portion of the pivot member on the hood side are rotatably supported by the support post and the support member coupled to the threshing device, respectively, and therefore can be stably supported on both the upper and lower sides. Further, there is an advantage that the vertically long support column can be used as a support frame for supporting another device provided in the prime mover. However, the above-described conventional structure has the following disadvantages, and still has room for improvement.

The portion of the pivot member that is fitted into and supported by the fixed-side member (the stay and the support member) may have a predetermined dimensional tolerance and may be slightly loosened. The dimensional tolerance at the location of such an embedded bearing cannot be made zero. Further, in the above-described conventional structure, since the fulcrum length of the pivot fulcrum member in the vertical direction, that is, the vertical interval between the upper end portion and the lower end portion is short, the entire hood may be inclined downward when switched to the extended posture due to play caused by dimensional tolerance at the above-described fitting support portion. In particular, in a configuration in which the entire cab including the cab can be switched in posture integrally with the engine hood, there is a concern that the amount of inclination becomes large.

If the entire hood tilts downward when switching to the extended position, the entire hood needs to be rotated toward the retracted position while being lifted upward when switching the hood from the extended position to the retracted position, which disadvantageously increases the labor burden when performing the position switching operation.

Disclosure of Invention

Therefore, there is a need for a combine harvester that can reduce the labor burden when performing the posture switching work in a configuration in which the posture of the hood can be switched.

The combine harvester of the invention is structurally characterized in that,

the exhaust gas purifying device is provided with an engine, an engine cover covering the upper part of the engine, an exhaust gas treating device for purifying the exhaust gas of the engine, a support member erected from a body frame and formed into a cylinder shape, and a rotation fulcrum member integrally connected with the engine cover and extending along the vertical direction,

the engine cover is configured to be switchable between a retracted posture in which the engine cover is located on an inner side of the engine body and an extended posture in which the engine cover is extended to an outer side in a lateral direction of the engine body by rotatably supporting the pivot support member around an upper and lower axial center in a state of being inserted into the support member from above,

the exhaust gas treatment device is supported by the support member.

According to the present invention, the cylindrical support member is erected from the body frame on the machine body side. The hood is provided with a pivot member integrally connected to the engine hood and extending in the vertical direction. The pivot support member is supported to be rotatable about the vertical axis in a state of being inserted into the support member from above.

Since the pivot member is inserted into the cylindrical support member from above, the pivot member can be formed to be longer in the vertical direction than in the conventional case by increasing the insertion depth with respect to the support member. In the structure in which the upper end portion and the lower end portion of the pivot member are rotatably supported, respectively, the distance between the upper end portion and the lower end portion of the pivot member is larger than that in the conventional structure.

As a result, since the vertical interval between the upper end portion and the lower end portion of the pivot member rotatably supported by the fixed-side member is larger than that of the conventional one, even if the portion of the pivot member supported by the fixed-side member has a predetermined dimensional tolerance and becomes loose, the vertical interval between the upper end portion and the lower end portion of the pivot member rotatably supported by the fixed-side member becomes long, and therefore, when the engine hood is switched to the extended position, the amount of downward inclination of the entire engine hood is reduced.

Further, the exhaust gas treatment device is supported by the support member erected from the body frame. As a structure for supporting the exhaust gas treatment device, it is conceivable to support the exhaust gas treatment device on the body frame instead of the support member, but in a structure in which the exhaust gas treatment device is supported on the body frame, there is a concern that a large installation space in a plan view is required.

In contrast, according to the present invention, since the exhaust gas treatment device is supported by the support member that is erected from the body frame and extends in the vertical direction, the installation space in a plan view can be reduced as much as possible.

Therefore, the exhaust gas treatment device can be supported with a reduced installation space, and when the hood is switched from the extended posture to the retracted posture, the entire hood does not need to be lifted upward greatly, and the burden of labor for posture switching work can be reduced.

In the present invention, it is preferable that a bearing portion that regulates a position of the pivot support member in an axial direction and that rotatably receives and supports the pivot support member is provided inside the tube of the support member.

According to this configuration, the pivot fulcrum member inserted into the support member from above is rotatably supported by the bearing portion provided inside the tube of the support member. The bearing portion is provided inside the tube of the support member and can be provided at any position in the axial direction of the support member.

Since the insertion depth of the pivot support member with respect to the support member is determined by the position of the bearing portion, the insertion depth of the pivot support member with respect to the support member can be set to an appropriate value by setting the position of the bearing portion in the axial direction of the support member.

In the present invention, it is preferable that,

a reduced diameter portion having a smaller inner diameter than an inner diameter of a portion of the support member located above the reduced diameter portion is formed at a position located midway in the vertical direction,

the lower end portion of the pivot fulcrum member is supported by the stepped portion of the upper portion of the reduced diameter portion, and the reduced diameter portion functions as the bearing portion.

According to this configuration, the lower end portion of the pivot fulcrum member inserted into the support member is supported by the step portion formed at the upper portion of the reduced diameter portion at the vertically intermediate position in the support member. The sliding portion is slidably guided by the reduced diameter portion or a sliding portion provided in the vicinity thereof, and is supported so as to be rotatable about the vertical axis.

Therefore, the rotation fulcrum member can be rotatably supported by a simple structure in which the reduced diameter portion is formed in the support member.

In the present invention, it is preferable that a rotation shaft portion is provided in a state of protruding downward from a lower end portion of the rotation fulcrum member, and a sliding portion is provided between an outer peripheral portion of the rotation shaft portion and an inner peripheral portion of the reduced diameter portion.

According to this configuration, the rotation shaft portion protruding downward from the lower end portion of the rotation fulcrum member is fitted into the inner peripheral portion of the reduced diameter portion, and relatively slides between the outer peripheral portion of the rotation shaft portion and the inner peripheral portion of the reduced diameter portion, so that the rotation fulcrum member is supported rotatably about the vertical axis.

Therefore, the sliding portion can be made small and the number of processing steps can be reduced by adopting a structure in which the inner peripheral portion of the reduced diameter portion is effectively used to slidably guide the rotation fulcrum member.

In the present invention, it is preferable that the support member includes a cylindrical inner tube member located on a radially inner side and on a lower side and a cylindrical outer tube member located on a radially outer side and on an upper side of the inner tube member, the support member is configured by partially fitting the inner tube member and the outer tube member together, the reduced diameter portion is formed at an upper end portion of the inner tube member, and the inner tube member and the outer tube member are configured to be releasable from each other.

According to this configuration, the cylindrical inner cylinder member and the cylindrical outer cylinder member are connected in a state in which the inner cylinder member is positioned on the lower side and the outer cylinder member is positioned on the upper side, and these members are partially fitted together, thereby constituting the support member.

The upper end portion of the inner cylinder member is located inside the cylinder of the outer cylinder member, a reduced diameter portion is formed by the upper end portion of the inner cylinder member, and the upper end portion of the inner cylinder member corresponds to the vertical middle position inside the support member. Since the outer cylinder member is present above the upper end of the inner cylinder member and the inner cylinder member is present below the upper end of the inner cylinder member, the inner diameter below the upper end of the inner cylinder member is smaller than the inner diameter above the upper end of the inner cylinder member.

Since the inner cylinder member and the outer cylinder member can be decoupled, when the outer cylinder member is decoupled and the outer cylinder member is removed, the upper end portion of the inner cylinder member is in an outwardly open state, and therefore, the upper end portion of the inner cylinder member can be easily subjected to a machining operation for rotatably supporting the rotation fulcrum member.

In the present invention, it is preferable that the exhaust gas treatment device is supported by an outer peripheral portion of the outer cylindrical member.

According to this configuration, the exhaust gas treatment device is supported by the outer peripheral portion of the outer cylindrical member provided radially outward of the support member. Since the rotation fulcrum member is inserted in a state of being inserted through the inside of the outer cylinder member, the exhaust gas treatment device does not affect the mounting of the rotation fulcrum member.

Therefore, the pivot member can be supported in a stable state with less tilt, and the exhaust gas treatment device can be supported satisfactorily.

Drawings

Fig. 1 is an overall side view of a combine harvester.

Fig. 2 is an overall plan view of the combine harvester.

Fig. 3 is a cross-sectional top view of the front of the combine.

Fig. 4 is a vertical rear view showing a positional relationship between the threshing device and the exhaust duct.

Fig. 5 is a right side view of the front of the combine.

FIG. 6 is a left side view of the motive portion.

Fig. 7 is a vertical sectional side view showing the rotation support structure.

Fig. 8 is a rear view of the grain bin.

Fig. 9 is a top view of a grain bin.

Fig. 10 is a perspective view of a grain box.

Fig. 11 is a perspective view of a grain box.

Fig. 12 is a longitudinal sectional front view of the exhaust pipe.

Fig. 13 is a perspective view of the heat shield.

FIG. 14 is a cross-sectional top view of the heat shield.

Description of the reference numerals

34 engine

35 Engine cover

37 machine body frame

38 support member

40 pivot fulcrum member

41 inner barrel part

41a upper end part

42 outer cylinder member

46 bearing part

47 reducing part

49 turning shaft part

53 sliding part

58 second exhaust gas treatment device (exhaust gas treatment device)

Y1 upper and lower axle center

Detailed Description

Hereinafter, a case where the embodiment of the present invention is applied to a semi-feeding type combine harvester will be described with reference to the drawings.

[ integral Structure ]

As shown in fig. 1 and 2, a combine harvester according to the present invention is provided with a harvesting unit 2 for harvesting standing grain stalks at the front of a traveling machine body that automatically travels by a pair of left and right crawler traveling devices 1, 1. A driving part 4 whose periphery is covered by a driving shed 3 is arranged at the right side of the front part of the traveling machine body, and a threshing device 5 for threshing the grain stalks harvested by the harvesting part 2 and a grain box 6 for storing the grains obtained by the threshing process are arranged at the rear part of the traveling machine body in a horizontal parallel state. A driving part 8 is provided in a state of being positioned below a driver seat 7 in a driver part 4 of a traveling machine body, and a grain discharging device 9 for discharging grains stored in a grain box 6 to the outside of the machine body is provided.

In this embodiment, when the front-rear direction of the body is defined, the body travel direction in the working state is defined, and when the left-right direction of the body is defined, the left-right direction is defined in a state viewed along the body travel direction. That is, the direction indicated by reference numeral (F) in fig. 1 and 2 is the front side of the body, and the direction indicated by reference numeral (B) in fig. 1 and 2 is the rear side of the body. The direction indicated by reference numeral (L) in fig. 2 is the left side of the body, and the direction indicated by reference numeral (R) in fig. 2 is the right side of the body.

The harvesting section 2 includes a seedling separating unit 10, a plurality of grain lifting devices 11, a pusher-type harvesting device 12, a vertical conveying device 13, and the like, the seedling separating unit 10 performs seedling separation guide on the roots of the standing grain stalks to be harvested, the grain lifting device 11 lifts the standing grain stalks after seedling separation into a longitudinal posture, the harvesting device 12 cuts the roots of the lifted standing grain stalks, and the vertical conveying device 13 conveys the standing grain stalks backward while changing the posture of the harvested grain stalks from the longitudinal posture to a horizontal posture and supplies the grain stalks to the threshing device 5.

The threshing device 5 supplies the ear tips to the threshing chamber 14 and performs threshing while conveying the plant roots of the supplied harvested straws toward the rear of the machine body by clamping the plant roots by the threshing feeding chain 5a and the clamping guide 5 b. The threshing chamber 14 is defined by lateral side walls 15, a ceiling 16, a front wall 17, and a rear wall 18 on both left and right sides of the threshing device 5. The threshing chamber 14 includes a threshing cylinder 19 supported rotatably across the front wall 17 and the rear wall 18 and driven to rotate around a front-rear axis, a screen 20 (see fig. 4) that is arcuate in shape when viewed in a front-rear direction along an outer periphery of a lower side thereof, and the like, and the threshing cylinder 19 and the screen 20 perform threshing processing by picking up the ear tips of the harvested straws.

The treated matter after the threshing process is sorted into grains, straw chips, and the like by the sorting section 21 below. The grains are carried out to the lateral right outside of the threshing device 5 by a primary material conveying auger, not shown, and then are winnowed by a winnowing conveyor 22 and conveyed to the inside of the grain box 6. The grain tank 6 stores grains fed from the threshing device 5. Then, the grains stored in the grain box 6 are carried out to the outside by the grain unloading device 9.

As shown in fig. 4, the sorting unit 21 performs specific gravity difference sorting while swinging the threshing processed object by a swinging sorting device (not shown), blows the straw chips and the like away by the sorting wind generated by the winnowing machine 23, and discharges the straw chips and the like to the outside from a dust discharge port (not shown) formed at the rear end of the machine body of the threshing device 5. The winnowing machine 23 is arranged at the lower position of the front side of the threshing device 5. The air separator 23 is provided with a plurality of blades 25 integrally rotatably on the outer peripheral portion of a drive shaft 24 extending in the left-right direction of the machine body. As shown in fig. 4 and 5, air inlets 26 are formed in the lateral side walls 15 on both left and right sides of the position of the air separator 23 of the threshing device 5. The air separator 23 rotates the blade body 25 by driving the drive shaft 24 to rotate, and conveys the sucked air toward the sorting unit 21 as sorting air while sucking the outside air from the left and right air inlets 26.

The threshing device 5 can open the top plate 16 and the threshing cylinder 19 integrally upward, and can easily perform an operation of removing clogged straws attached to the screen mesh 20 and a maintenance operation such as inspection and repair after the operation is completed.

As shown in fig. 2 and 4, an upper structure 27 provided with the front wall 17, the rear wall 18, the threshing cylinder 19, the top plate 16, and the like in the threshing chamber 14 is integrally supported by a lower frame body 29 via a support arm 28 so as to be rotatable about a front-rear axis X located on the right side (grain tank side) of the machine body. A hydraulic cylinder 30 is provided across the upper structure 27 and the lower frame 29. By extending and contracting the hydraulic cylinder 30, the upper structure 27 is swingably opened and closed between a closed position where it is close to the lower frame 29 to close the top plate 16 and an open position (position shown by the virtual line in fig. 4) for maintenance where it is raised and swung to open the top plate 16 and the threshing cylinder 19.

[ opening and closing structure around steering wheel ]

As shown in fig. 3, the operator's section 4 includes an operator's seat 7, a vehicle front outer panel 31 positioned in front of the operator's seat 7, a floor section 32 positioned between the vehicle front outer panel 31 and the operator's seat 7, a side panel 33 positioned on the inner side (left side) in the left-right direction of the body with respect to the operator's seat 7, and the like. The cab 3 covers the upper side of the cab 4. The driver seat 7 is supported on the upper part of an engine cover 35, and the engine cover 35 covers the upper part of a diesel engine 34 provided in the prime mover 8.

As shown in fig. 5, the engine cover 35 includes a front plate portion 35a positioned on the front side of the engine 34, an upper surface portion 35b positioned on the upper side of the engine 34, an air supply chamber constituting portion 35c formed behind the driver seat 7 in a state of being continuous with the rear side of the upper surface portion 35b, and the like, thereby forming an engine chamber.

As shown in fig. 2 and 3, the hood 35, the vehicle front outer panel 31, the side panel 33, the floor portion 32, the operator's seat 7, the cab 3, and the like are integrally connected to form an operator's structure 36. As shown in fig. 2 and 5 to 7, the cab structure 36 is supported by the body frame 37 so as to be rotatable about a vertical axis Y1 on the left rear side of the cab seat 7.

Next, the rotation support structure of the cab structure 36 will be described in detail.

As shown in fig. 3 and 5 to 7, a tubular support member 38 stands from the body frame 37 at a left rear portion of the cab 4. On the other hand, a pivot member 40 extending long in the vertical direction is integrally connected to the left side portion of the back of the cab structure 36 via an arm portion 39. The pivot support member 40 is inserted into the support member 38 from above, and is supported to be rotatable about the vertical axis Y1. Therefore, the cab structure 36 is configured to be switchable between a retracted posture located on the inner side of the machine body and an extended posture extending outward in the lateral direction of the machine body.

Further, as shown in fig. 7, the support member 38 includes an inner cylindrical member 41 positioned on the radially inner side and an outer cylindrical member 42 positioned on the radially outer side. The inner cylinder member 41 is positioned on the lower side, the outer cylinder member 42 is positioned on the upper side, and the inner cylinder member 41 and the outer cylinder member 42 are coupled by a bolt 43 in a partially fitted state. The inner tube member 41 is fixed to the body frame 37 by connecting a flange 45 integrally formed at the lower end portion of the lower portion of the inner tube member 41 to the body frame 37 by bolts in a state in which the lower portion of the inner tube member 41 is fitted externally to a fixing pin 44 fixed by welding to the body frame 37. The vertical length of the outer cylindrical member 42 is longer than the vertical length of the inner cylindrical member 41.

The support member 38 includes a bearing 46 for regulating the position of the pivot member 40 in the axial direction and rotatably receiving and supporting the pivot member 40. That is, as shown in fig. 7, a reduced diameter portion 47 is formed by the upper end portion of the inner cylindrical member 41 inside the support member 38. The inner diameter of the portion closer to the lower side than the reduced diameter portion 47 is smaller than the inner diameter of the portion closer to the upper side than the reduced diameter portion 47.

As shown in fig. 7, a bush 48 for slide guide is provided on the inner peripheral portion of the reduced diameter portion 47. A pivot shaft portion 49 having an outer diameter smaller than that of the pivot member 40 is provided at the lower end portion of the pivot member 40 so as to project downward. The lower end of the rotation fulcrum member 40 is supported by the upper end surface of the inner cylindrical member 41, and the rotation shaft portion 49 is fitted to a bush 48 provided on the inner peripheral portion of the reduced diameter portion 47, and is supported by the support member 38 so as to be rotatable about the vertical axis Y1. A rotation shaft portion formed at the lower end portion of the rotation fulcrum member 40 is fitted into the bush 48, and the lower end surface of the rotation fulcrum member 40 is supported in contact with the upper end surface 41a of the inner tube member 41, so that the rotation fulcrum member 40 is rotatably supported on the inner tube member 41.

Therefore, the upper end portion of the inner cylindrical member 41 functions as the bearing portion 46, and the sliding portion 53 is formed between the rotating shaft portion 49 and the bush 48 provided on the inner peripheral portion of the reduced diameter portion 47. The upper end of the pivot member 40 is supported by the bracket 50 so as to be pivotable about the vertical axis Y1, and the bracket 50 is connected to the lateral side wall 15 of the threshing device 5.

The inner cylindrical member 41 and the outer cylindrical member 42 are coupled together at a plurality of circumferentially spaced locations in the radial direction by bolts at the locations where they are fitted to each other. In a state where the bolt fastening is released, the inner tube member 41 and the outer tube member 42 can be separated from each other. When the connection between the inner cylinder member 41 and the outer cylinder member 42 is released and the outer cylinder member 42 is detached from the inner cylinder member 41, the upper end portion of the inner cylinder member 41 is opened outward. In this way, the bush 48 can be easily replaced in a state where the upper end portion of the inner tubular member 41 is opened outward.

According to the above configuration, the cab structure 36 is supported by the support member 38 via the pivot support member 40 so as to be rotatable about the vertical axis Y1. The cab structure 36 having the engine cover 35 is supported by the body frame 37 so as to be rotatable about the vertical axis Y1, and the cab structure 36 is configured to be switchable between a retracted posture in which the cab structure is positioned on the inner side of the body so as to cover the upper side of the prime mover 8 as shown by the solid line in fig. 2 and an extended posture in which the cab structure extends outward of the body so as to open the upper side of the prime mover 8 as shown by the two-dot chain line in fig. 2. By switching the cab structure 36 to the extended posture, the upper part of the prime mover 8 is largely opened, and therefore maintenance work of the prime mover 8 is facilitated.

[ grain case ]

As shown in fig. 8, the bottom of the grain box 6 is formed into a substantially V-shape in front view, and the lowest end of the grain box 6 is provided with a transport auger 51 for transporting stored grains to the outside of the rear part of the machine body. The grains conveyed to the outside of the rear part of the body by the conveying auger 51 are conveyed by the grain discharge device 9 (see fig. 1 and 2) and discharged to the outside of the body.

As shown in fig. 1, the grain unloading device 9 includes a vertical screw conveyor 9A that vertically conveys grain conveyed by a conveying screw 51 upward, and a horizontal screw conveyor 9B that is connected to an upper portion of the vertical screw conveyor 9A and horizontally conveys grain to a discharge port 52 at a front end.

As shown in fig. 10, the grain box 6 is formed to be narrow at the lower portion in the front view of the machine body, and a first recessed portion Q1 which is substantially rectangular in plan view and substantially rhombic in the front view of the machine body is formed on the bottom inclined surface 6a of the narrow lower portion on the front side of the machine body. The first recessed portion Q1 is a recessed portion surrounded by each of the inner longitudinal surface 6b in the posture along the longitudinal direction and the posture along the front-rear direction, the rear longitudinal surface 6c in the posture along the longitudinal direction and the posture along the left-right direction, and the upper surface 6d located on the upper side.

As shown in fig. 11, a bulging portion 6A formed by a front left side surface 6e in a vertical posture provided in a state of being close to the lateral wall 15 on the right side of the thresher 5, an upper inclined surface 6f extending obliquely upward leftward from an upper end of the front left side surface 6e toward the upper side of the thresher 5, an extended vertical side surface 6g in a vertical posture extending upward from an upper end of the upper inclined surface 6f, a front surface 6h on the front side, and a rear surface 6i on the rear side is formed on the upper side of the first recessed portion Q1. By forming the bulge portion 6A bulging upward of the threshing device 5 in this manner, the amount of stored grains is increased.

As shown in fig. 10 and 11, a second recessed portion Q2 is formed as a groove, and the second recessed portion Q2 is connected to the rear side of the body of the first recessed portion Q1 and is located upward toward the rear side of the body. The second recessed portion Q2 is formed in a groove shape surrounded by each of an inner longitudinal surface 6k, a bottom surface 6l, and an upper surface 6m, the inner longitudinal surface 6k is formed in a state of entering the inside of the box from a right longitudinal surface 6j formed in a longitudinal direction from an upper end portion of the bottom inclined surface 6a, the bottom surface 6l is in an inclined posture such that it is positioned upward toward the rear side of the machine body, and the upper surface 6m is in an inclined posture such that it is positioned upward toward the rear side of the machine body. The exhaust pipe 75 described later is provided in a state of entering the second recessed portion Q2.

A third recessed portion Q3 is formed to be continuous with the rear side of the body of the second recessed portion Q2 and to extend in the up-down direction. The third recessed portion Q3 is formed on the right side of the grain box 6 so as to extend from the bottom inclined surface 6a in the vertical direction to the upper end of the box and be recessed inward (toward the right side of the machine body). The third recessed portion Q3 is formed by being surrounded by the rear surface 6i of the bulge portion 6A, the rear longitudinal side surface 6n in an inclined posture located on the rear side and located on the rear side of the housing further toward the left side of the housing, and the narrow-width inner longitudinal side surface 6o located on the innermost side. The winnowing conveyor 22 is equipped in a state of entering the third concave portion Q3.

A fourth recessed portion Q4, which is continuous with the rear side of the body of the third recessed portion Q3 and has a substantially rhombic shape in a plan view (see fig. 9), is formed in a state where a lower side portion of a corner portion between the rear-side longitudinal surface 6n and the rear-side left side surface 6p of the third recessed portion Q3 is cut away. The fourth recessed portion Q4 is a recessed portion surrounded by the respective surfaces of the inner longitudinal surface 6Q in the longitudinal posture and oriented in the front-rear posture, the rear longitudinal surface 6r in the longitudinal posture and oriented in the inclined posture such that the front end of the inner longitudinal surface 6Q is located on the front side of the machine body toward the machine body inner side, and the upper surface 6s in the inclined posture substantially parallel to the bottom inclined surface 6 a. The fourth recessed portion Q4 is provided with a secondary reducing device (not shown) for reducing secondary products such as branched rice grains generated in the sorting unit of the threshing device 5 into the threshing chamber 14 in an entering state.

A fifth recessed portion Q5 for allowing passage of a row straw feeding device, not shown, is formed in the rear left portion of the grain box 6. As shown in fig. 11, a left side surface 6p across the rear side and a rear surface 6t on the rear side are provided with an inclined surface 6u in an inclined posture that is positioned on the right side of the machine body as it goes to the rear side of the machine body, thereby forming a fifth recessed portion Q5.

The front left side surface 6e and the rear left side surface 6p are provided at substantially the same position in the left-right direction of the machine body, and the extended longitudinal surface 6g of the bulging portion 6A is provided at a position projecting more to the right of the machine body than the front left side surface 6e and the rear left side surface 6 p. The inner longitudinal surface 6k of the second recessed portion Q2 and the inner longitudinal surface 6Q of the fourth recessed portion Q4 are provided at substantially the same position in the lateral direction of the machine body.

As shown in fig. 2, the grain box 6 is supported by the machine body frame 37 so as to be rotatable about an upper and lower axial center Y2 which is a rotational axial center of the vertical screw conveyor 9A, and is set so as to be changeable in posture between a normal operation posture (a state shown by a solid line in fig. 2) in which it is retracted inward of the machine body and an extended posture (a state shown by a two-dot chain line in fig. 2) in which it is extended outward in the lateral direction of the machine body. When the steering unit structure 36 is switched to the extended position, the grain tank 6 needs to be switched to the extended position in advance.

[ Prime department ]

As shown in fig. 3 and 5, prime mover 8 includes engine 34, air cleaner 54, engine-cooling radiator 55, cooling fan 56, and the like. The air cleaner 54 is provided in the air supply chamber constituting portion 35c of the engine cover 35, and as shown in fig. 1 and 2, the pre-cleaner 54a is provided in a rear right portion of the ceiling portion of the cab 3. As shown in fig. 3, 5, and 6, the prime mover 8 includes a first exhaust gas treatment device 57 that reduces particulate matter contained in the exhaust gas of the engine 34, and a second exhaust gas treatment device 58 that reduces nitrogen oxides contained in the exhaust gas treated by the first exhaust gas treatment device 57 (corresponding to the exhaust gas treatment operation in the present invention).

The first exhaust gas treatment device 57 includes a Diesel Particulate Filter (DPF) (not shown) of a known technique for trapping diesel particulates contained in the exhaust gas, and reduces the diesel particulates by passing the exhaust gas therethrough.

The second exhaust gas treatment device 58 performs a purification treatment of exhaust gas by Selective Catalytic Reduction (SCR) of a known technique. Specifically, urea water, which is an example of a reducing agent, is injected into the exhaust gas to be hydrolyzed, thereby producing ammonia (NH)₃) Chemically reacts with nitrogen oxides (NOx) contained in the exhaust gas to reduce the nitrogen oxides to nitrogen (N)₂) With water (H)₂O) to reduce the nitrogen oxides contained in the exhaust gas.

As shown in fig. 3 and 6, the first exhaust gas treatment device 57 is provided inside the engine cover 35. That is, the first exhaust gas treatment device 57 is disposed in the body transverse width direction inner side region below the side plate 33 and above the engine 34 in a state of being offset to the body left side from the driver seat 7 and in a state of being along the body front-rear direction. The first exhaust gas treatment device 57 is connected and supported by the engine 34 via a pair of support portions 59 and 60 on both the front and rear sides of the machine body.

As shown in fig. 6, the first exhaust gas treatment device 57 includes an exhaust gas introduction port 61 at a lower portion on the front side of the body, and the exhaust gas introduction port 61 is connected to an exhaust pipe 63 on the engine 34 side. As shown in fig. 3, the first exhaust gas treatment device 57 includes an exhaust gas outlet 62 at a right side portion on the rear side of the body.

As shown in fig. 3 and 6, the second exhaust gas treatment device 58 is disposed outside the engine cover 35 and on the rear side of the body of the cab 4 in plan view. The second exhaust gas treatment device 58 is located below the front portion of the grain tank 6, and is provided in a state of overlapping with the grain tank 6 in a plan view.

As described above, the grain box 6 is formed to be narrow at the lower portion in the front view, and the bottom inclined surface 6a which is narrowed at the lower portion is formed with the first recessed portion Q1 recessed inward of the box. And, at the same time, as shown in fig. 8, the second exhaust treatment device 58 is equipped in a state of entering the first recessed portion Q1.

As shown in fig. 5 and 6, the second exhaust gas treatment device 58 includes a cylindrical quantitative section 64 for injecting and supplying urea water to the exhaust gas supplied from the first exhaust gas treatment device 57, and a cylindrical main body treatment section 65 having a larger diameter than the quantitative section 64 and performing reduction treatment. The quantitative section 64 and the main body processing section 65 are integrally connected at their lower portions, and the exhaust gas injected and supplied with the urea water by the quantitative section 64 is communicated with the main body processing section 65. The cylindrical quantitative section 64 and the main body processing section 65 are each formed to be long in the direction along the central axis of the cylindrical shape.

The main body processing unit 65 is disposed in a posture such that a direction along the central axis of the cylindrical shape is along the vertical direction of the machine body. The cylindrical quantitative section 64 is located on the right side of the machine body with respect to the main body treatment section 65, and the cylindrical quantitative section 64 is disposed in a state of being arranged parallel to the main body treatment section 65 in such a manner as to be oriented in the vertical direction of the machine body along the direction of the central axis of the cylindrical shape.

Therefore, the second exhaust gas treatment device 58 is disposed in a vertical posture in a state in which the longitudinal direction, which is the direction along the central axis of the cylindrical shape of the cylindrical main body treatment part 65 and the quantitative part 64, is along the vertical direction.

As shown in fig. 3 and 6, the second exhaust gas treatment device 58 is supported by the outer tube member 42, which rotatably supports the support member 38 of the cab structure 36, by the upper connection support portion 66 and the lower connection support portion 67. That is, the upper-side coupling support portion 66 and the lower-side coupling support portion 67 are integrally fixed to the outer peripheral portion of the outer tubular member 42 by a coupling bracket 68 having an L-shape in side view. A lateral support body 69 is fixed to an outer peripheral portion of the main body treatment portion 65 of the second exhaust gas treatment device 58 at a portion corresponding to the coupling brackets 68 on both the upper and lower sides. The second exhaust gas treatment device 58 is supported by the outer cylindrical member 42 by connecting the upper and lower lateral support bodies 69 to the upper and lower connection brackets 68 with bolts.

As shown in fig. 3, an exhaust gas outlet 62 is formed on the right side of the body (the outer side in the transverse width direction of the body) on the rear side of the body of the first exhaust gas treatment device 57. As shown in fig. 3 and 5, in the second exhaust gas treatment device 58, an exhaust gas supply portion 70 is formed at an upper portion side of the quantitative section 64 located on the right side of the body with respect to the main body treatment portion 65.

As shown in fig. 3, the exhaust gas outlet portion 62 of the first exhaust gas treatment device 57 and the exhaust gas supply portion 70 of the second exhaust gas treatment device 58 are connected in communication via a communication connection pipe 71 as a connection member. The communication connection pipe 71 is flange-connected to the exhaust gas outlet portion 62 of the first exhaust gas treatment device 57, and flange-connected to the exhaust gas supply portion 70 of the second exhaust gas treatment device 58.

The communication connection pipe 71 includes a flexible bellows 71A, and is configured to be flexible. By providing the bellows 71A, the vibration of the engine 34 supported by the body frame 37 via the rubber mount is prevented from being transmitted to the second exhaust gas treatment device 58, and the second exhaust gas treatment device 58 is supported in a stable state.

As shown in fig. 3 and 5, a urea water tank 72 that stores urea water as a reducing agent supplied to second exhaust gas treatment device 58 is provided below bottom plate portion 32 of cab 4. Urea water tank 72 is supported by body frame 37. The urea water in the urea water tank 72 is supplied to the second exhaust gas treatment device 58 through a pipe by a pump, which will not be described in detail below. The remaining urea aqueous solution that is not injected is returned to urea aqueous solution tank 72.

As shown in fig. 6, the second exhaust gas treatment device 58 includes an exhaust gas outlet pipe 73 at a rear portion of the body above the main body treatment portion 65. The exhaust gas flow-out pipe 73 includes a base end side portion 73a extending horizontally or substantially horizontally from the exhaust gas outlet portion 74 of the second exhaust gas treatment device 58 toward the rear side of the engine body, and a curved front end side portion 73b extending from a protruding end of the base end side portion 73a so as to curve from a state of facing the rear side of the engine body to a state of facing the rear upper side of the engine body. The exhaust pipe 75 is provided, and the exhaust pipe 75 discharges to the outside the exhaust gas treated by the first exhaust gas treatment device 57 and the second exhaust gas treatment device 58 and discharged through the exhaust gas discharge pipe 73. The exhaust pipe 75 will be described later.

[ Heat shield ]

As shown in fig. 3, 6, 8, 13, and 14, a heat shield 76 is provided between the grain tank 6 and the second exhaust gas treatment device 58 to block heat of the second exhaust gas treatment device 58. The heat insulating cover 76 is provided so as to cover an upper portion side portion, a portion corresponding to a side opposite to the threshing mechanism 5, and a portion corresponding to a rear portion side portion in the periphery of the second exhaust gas treatment device 58. Further, the heat insulating cover 76 is provided to cover and insulate the portions of the first recessed portion Q1 of the grain box 6 that face the inner longitudinal surface 6b, the rear longitudinal surface 6c, and the upper longitudinal surface 6d, respectively.

The upper side surface 6d of the first recessed portion Q1 of the grain box 6 is formed in an inclined posture substantially parallel to the bottom inclined surface 6 a. That is, the upper side surface 6d is formed in an inclined posture in which the end portion of the right side of the machine body (the side opposite to the threshing device) connected to the inner longitudinal surface 6b is at the lowest position and is located at a higher position toward the left side of the machine body (the threshing device side).

As shown in fig. 13, the upper surface 77 of the heat insulating cover 76 covering the portion facing the upper side surface 6d of the grain tank 6 is inclined so as to be located at a higher position toward the threshing device 5 side along the upper side surface 6d of the grain tank 6. By thus setting the upper surface 77 in the inclined posture, the space above the second exhaust gas treatment device 58 can be widened, and the heat generated by the second exhaust gas treatment device 58 is prevented from being accumulated in a narrow space, whereby the heat can be easily diffused.

The upper surface 77 of the heat shield 76 in the inclined posture is divided into a base end side portion 77a and an extension side portion 77b connected thereto. The base end side portion 77a is integrally formed with an inner back surface 78 facing the inner back side longitudinal surface 6b of the grain box 6 and a rear side surface 79 facing the rear side longitudinal surface 6c of the grain box 6. The lower end of the extended portion 77b of the upper surface 77 is fastened and fixed to the base end portion 77a of the upper surface 77 by bolts at a plurality of locations. By releasing the bolt connection, the extension side portion 77b can be detached.

As shown in fig. 13 and 14, the rear surface 79 of the heat insulating cover 76 covering the portion facing the rear longitudinal surface 6c of the grain box 6 includes an inclined surface portion 79a along the rear longitudinal surface 6c, a laterally extending installation surface portion 79b along the left-right direction of the machine body, and an upper laterally extending installation surface portion 79c located between the laterally extending installation surface portion 79b and the extended side portion 77b of the upper surface 77, and covers substantially the entire area of the portion facing the rear longitudinal surface 6c of the grain box 6. An insertion portion 80 into which the exhaust gas outflow pipe 73 is inserted is formed at an upper portion of the laterally extending installation surface portion 79 b. The upper side extension installation surface portion 79c includes a porous member 81 as a ventilation portion. The porous member 81 is formed of a mesh body. The porous member 81 is not limited to a mesh body, and may be a porous plate body with a plurality of holes formed therein.

The inner surface 78 (corresponding to the side opposite to the threshing device 5 side) of the heat insulating cover 76 covering the portion facing the inner longitudinal surface 6b of the grain tank 6 is provided with a porous member 82 as a ventilation portion. The porous member 82 is formed of a mesh body. The porous member 82 is not limited to a mesh, and may be a porous plate with a plurality of holes formed therein.

A concave portion 83 that is concave toward the threshing device 5 side is formed on the lower side of the front portion of the machine body of the inner surface 78. By forming the recessed portion 83, a working space for a worker to put his hand into the prime mover 8 in a state where the grain tank 6 is switched to the extended posture is secured.

As shown in fig. 14, the left side portion of the second exhaust gas treatment device 58 in the circumferential direction of the body facing the threshing device 5 is opened without being covered with the heat insulating cover 76. The open portion overlaps with the inlet port 26 of the classifying air of the air classifier 23 in the threshing device 5 in side view. By rotating the air classifier 23, the air surrounding the second exhaust gas treatment device 58 is sucked together with the external air sucked through the air inlet 26.

The air around the second exhaust gas treatment device 58 becomes high temperature due to the heat generated by the second exhaust gas treatment device 58. In the harvesting operation in which the air separator 23 is operated, this high-temperature air is sucked by the air separator 23, passes through the threshing device 5, and is discharged to the outside of the machine body. At this time, as the air around the second exhaust gas treatment device 58 is sucked by the air separator 23, the air in the prime mover 8 is also sucked. Further, since the low-temperature outside air is sucked through the porous member 82 of the inner surface 78, the temperature of the air around the second exhaust gas treatment device 58 decreases.

In the state where the air separator 23 is not operated as in the on-road running, the air around the second exhaust gas treatment device 58 is not sucked by the air separator 23, but the air around the second exhaust gas treatment device 58 is discharged outward through the porous member 82 of the inner surface 78, so that heat does not remain in the narrow space inside the heat shield 76.

The heat shield 76 is fixed and supported by a support portion, not shown, on the machine body side by a plurality of bolts. The heat shield 76 remains on the body side when the grain tank 6 is switched to the extended position. When maintenance work is performed by switching the cab structure 36 to the extended position after the grain tank 6 is switched to the extended position, the extension portion 77b and the upper side extension installation surface portion 79c of the upper surface 77 of the heat shield 76 are removed. This can avoid interference of the cab structure 36 with the heat shield 76 as the cab structure rotates. The upper side extension surface portion 79c is integrally connected to the extension portion 77b of the upper surface 77, and the operation is easy.

In this way, the heat insulating cover 76 is provided at a distance from the second exhaust gas treatment device 58 and from the grain tank 6, and forms a heat insulating layer with air, so that heat from the second exhaust gas treatment device 58 is less likely to be transmitted to the grain tank 6.

The front-side region of the engine body facing the prime mover 8 in the periphery of the second exhaust gas treatment device 58 is not covered with the heat shield 76 but is open. The communication connection pipe 71 that connects the first exhaust gas treatment device 57 and the second exhaust gas treatment device 58 provided in the prime mover 8 can be provided favorably without interfering with the heat shield 76.

[ exhaust pipes ]

The exhaust pipe 75 extends upward between the threshing device 5 and the grain tank 6 so that the exhaust port 84 is located above the upper end of the threshing device 5. An exhaust port 84 is formed at the upper end of the exhaust pipe 75, and the upper end of the exhaust pipe 75 extends toward the threshing device 5.

As shown in fig. 4 and 12, the exhaust pipe 75 includes a first exhaust pipe 75A located on the second exhaust gas treatment device 58 side and serving as a vertically extending pipe, and a second exhaust pipe 75B located on the exhaust port 84 side and serving as an upper end portion of the exhaust pipe 75. The first exhaust pipe 75A extends in the vertical direction from a portion corresponding to the exhaust outlet port 74 of the second exhaust gas treatment device 58 in a posture inclined rearward and upward. The second exhaust pipe 75B is bent with respect to the first exhaust pipe 75A and extends toward the threshing device.

The first exhaust pipe 75A extends from the outlet portion of the exhaust gas outflow pipe 73 to a position corresponding to the upper end portion of the threshing device 5. As shown in fig. 12, the first exhaust pipe 75A has a double pipe structure of a cylindrical inner pipe 85 positioned inside and a cylindrical outer pipe 86 positioned outside, and further includes a cover member 87 having a substantially U-shaped cross section that covers the second recessed portion Q2 side of the grain box 6 in the outer pipe 86. Thus, the heat of the exhaust gas flowing through the inner pipe 85 is not transmitted to the outside.

The inner tube 85 is fixed to the outer tube 86 in a state of being inserted into the outer tube 86, and protrudes upward from an end of the outer tube 86. The body front side portion of the outer pipe 86 is supported on the right side wall of the threshing device 5 via a mounting bracket 88. The outer pipe 86 is supported by a coupling member 89 at a rear side portion of the machine body, and the coupling member 89 is used to support the winnowing conveyor 22 on a right side wall of the threshing device 5. The cover member 87 is fixed to a mounting bracket 90 provided in the outer tube 86 by a bolt.

As shown in fig. 12, the second exhaust pipe 75B is formed to have a larger diameter than the inner pipe 85 of the first exhaust pipe 75A, and a portion on the upstream side in the exhaust gas flow direction of the second exhaust pipe 75B overlaps with a portion on the downstream side in the exhaust gas flow direction of the inner pipe 85 in the exhaust gas flow direction, with a gap formed therebetween in the radial direction. By the injection action (action エジェクタ) accompanying the flow of the exhaust gas, the exhaust gas can be cooled by drawing the outside air from the gap into the interior.

An exhaust port is formed in the second exhaust pipe 75B, and the second exhaust pipe 75B is bent with respect to the first exhaust pipe 75A and faces the threshing device 5 side. The second exhaust pipe 75B is formed of a cylindrical body having a substantially circular cross section, and is extended in a curved shape toward the threshing device 5 side so as to be curved in a substantially circular arc shape toward the threshing device 5 side as it goes upward when viewed in the front-rear direction of the machine body. An exhaust port 84 is formed in an end surface of the distal end portion of the second exhaust pipe 75B. The air outlet 84 is formed in a shape in which the upper edge protrudes further away from the grain tank 6 than the lower edge, i.e., the left side of the machine body. The exhaust port 84 is formed in a straight line shape as viewed in the front-rear direction in an inclined posture such that the upper side of the cylindrical body is located outward from the lower side.

As shown in fig. 4, the air outlet 84 of the second air outlet pipe 75B is formed in an inclined shape in which the lower edge of the air outlet 84 is retreated toward the grain tank 6 side from the upper edge, so as to allow the upper structure 27 of the threshing device 5 to swing toward the open position.

The front end of the exhaust pipe 75 is located below the upper end of the grain box 6, and the front end of the exhaust pipe 75 is located below the horizontal auger conveyor 9B of the grain discharge device 9 in the storage position. Therefore, even if the lateral auger conveyor 9B is not only accommodated in the accommodating position but is separated from the accommodating position by vibration of the machine body, there is no fear that the exhaust pipe 75 interferes with the lateral auger conveyor 9B.

The exhaust gas discharged from the engine 34 is subjected to a purification process for reducing diesel particulates by the first exhaust gas treatment device 57, and is subjected to a purification process for reducing nitrogen oxides contained in the exhaust gas by the second exhaust gas treatment device 58, and the exhaust gas after the purification process is discharged to the outside of the engine body through the exhaust pipe 75.

[ other embodiments ]

(1) In the above embodiment, the support member is configured to include the cylindrical inner cylindrical member and the cylindrical outer cylindrical member, but instead of this configuration, a configuration may be employed in which a reduced diameter portion is formed inside a cylinder by forming in one cylindrical body.

(2) In the above embodiment, the rotation fulcrum member is supported by the step portion of the upper portion of the reduced diameter portion in the support member, but instead of this, a dedicated bearing member may be provided in the support member.

(3) In the above embodiment, the rotation shaft portion 49 is provided in a state of protruding downward from the lower end portion of the rotation fulcrum member 40, and the sliding portion 53 is provided between the outer peripheral portion of the rotation shaft portion 49 and the inner peripheral portion of the reduced diameter portion 47, but instead of this configuration, a configuration may be adopted in which the lower end portion of the rotation fulcrum member is made flat, the rotation fulcrum member is received by the stepped portion of the reduced diameter portion, and the sliding portion is provided between the inner peripheral portion of the outer cylindrical member and the outer peripheral portion of the rotation fulcrum member.

(4) In the above embodiment, the second exhaust gas treatment device 58 for reducing nitrogen oxides contained in the exhaust gas is provided as the exhaust gas treatment device, but the exhaust gas treatment device may be the first exhaust gas treatment device 57 for reducing particulate matter contained in the exhaust gas of the engine 34, or may be another type of exhaust gas treatment device.

(5) In the above embodiment, the case of application to a half-feed type combine harvester is shown, but the present invention can also be applied to a full-feed type combine harvester (general type コンバイン).

Industrial applicability

The present invention is applicable to a combine harvester in which an engine hood is configured to be switchable between a retracted posture located on an inner side of a machine body and an extended posture extending outward in a lateral direction of the machine body.

Claims

1. A combine harvester is characterized in that,

comprises an engine (34), an engine cover (35) covering the upper part of the engine (34), an exhaust gas treatment device (58) for purifying the exhaust gas of the engine (34), a support member (38) erected from a body frame (37) and formed into a cylindrical shape, and a rotation fulcrum member (40) integrally connected to the engine cover (35) and extending in the vertical direction,

the hood (35) is configured to be switchable between a retracted position located on the inner side of the body and an extended position extended outward in the lateral direction of the body by inserting the pivot member (40) into the support member (38) from above and supporting the pivot member (40) to the support member (38) so as to be rotatable about an upper and lower axial center (Y1),

the exhaust gas treatment device (58) is supported by the support member (38).

2. A combine harvester according to claim 1,

a bearing part (46) is provided in the cylinder of the support member (38), and the bearing part (46) regulates the position of the rotation fulcrum member (40) in the axial direction and rotatably receives and supports the rotation fulcrum member (40).

3. A combine harvester according to claim 2,

a reduced diameter portion (47) having a smaller inner diameter than the inner diameter of a portion located on the upper side of the position is formed at a position in the vertical middle of the inside of the support member (38),

the lower end of the pivot member (40) is supported by a step portion at the upper part of the reduced diameter portion (47), and the reduced diameter portion (47) functions as the bearing portion (46).

4. A combine harvester according to claim 3,

a rotating shaft part (49) is arranged in a state of protruding downwards from the lower end part of the rotating fulcrum component (40),

a sliding portion (53) is provided between the outer peripheral portion of the rotating shaft portion (49) and the inner peripheral portion of the reduced diameter portion (47).

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

the support member (38) is provided with a cylindrical inner cylinder member (41) positioned on the lower side on the radially inner side and a cylindrical outer cylinder member (42) positioned on the upper side on the radially outer side of the inner cylinder member (41), the support member (38) is configured by connecting the inner cylinder member (41) and the outer cylinder member (42) in a partially fitted state,

the reduced diameter portion (47) is formed at an upper end portion (41a) of the inner cylindrical member (41), and the inner cylindrical member (41) and the outer cylindrical member (42) are configured to be capable of being decoupled from each other.

6. A combine harvester according to claim 5,

the exhaust gas treatment device (58) is supported by the outer peripheral portion of the outer cylindrical member (42).

7. A combine harvester according to claim 6,

a support body (69) fixed to the outer peripheral portion of the exhaust gas treatment device (58) is coupled to a coupling bracket (68) fixed to the outer peripheral portion of the outer cylindrical member (42), whereby the exhaust gas treatment device (58) is supported by the outer peripheral portion of the outer cylindrical member (42).