WO2015178100A1

WO2015178100A1 - Combine harvester

Info

Publication number: WO2015178100A1
Application number: PCT/JP2015/059511
Authority: WO
Inventors: 桂輔山本
Original assignee: ヤンマー株式会社
Priority date: 2014-05-19
Filing date: 2015-03-26
Publication date: 2015-11-26
Also published as: CN106413379A; CN106413379B

Abstract

　The purpose of the present invention is to provide a combine harvester with which it is possible to prevent a delay in the engaging of a side clutch (121) in a forward movement operation involving the returning of an operating lever (43), and with which it is possible to improve the rotational performance and the responsiveness of the side clutch (121) engaging operation. In this combine harvester, drive power is transmitted to left and right running crawlers (2) via left and right side clutches (121) that are provided in a transmission case (63) for driving the left and right running crawlers (2), left and right side clutch arms (136) for disengaging the left and right side clutches (121) are provided in the transmission case (63), and an operator switches between the left and right side clutch arms (136) by operating an operating lever (43) for performing a left/right tilting operation so that the left or right side clutch arm (136) is caused to rotate to the left or right. The present invention is provided with a side clutch hydraulic switching body (138) having left and right side clutch cylinders (137). The side clutch hydraulic switching body (138) is disposed on the outside of the transmission case (63) with a hydraulic switching bracket (139) interposed therebetween, and left and right tensioning springs (181) are connected to the left and right side clutch arms (136), respectively, said springs (181) being used to return said arms (136).

Description

Combine

The present invention relates to a combine equipped with a reaping device for reaping uncut cereal grains in a field and a threshing device for threshing grains of the harvested cereal grains.

Conventionally, a traveling machine body having a traveling unit and a driver seat, a reaping device having a first cutting blade, a threshing device having a handling cylinder, a feeder house for supplying reaped cereals from the reaping device to the threshing device, and driving each part And a grain sorting mechanism that sorts the threshing material of the threshing device, and continuously chops uncut cereal grains in the field. In addition, there is a technology in which left and right side clutches are provided in the transmission case, the left and right side clutches are controlled by the operator's control lever operation, and the driving force of the left and right traveling crawlers is turned on and off to turn left and right (Patent Document) 1, see Patent Document 2).

JP 2007-159468 A JP 2010-239980 A

In the prior art, a return spring that maintains the side clutch in the engaged state is provided, and when the control lever is turned to the left or right, the side clutch on the inside of the turn is operated to be turned off against the return spring, and the control lever Since the side clutch was moved back to the engaged state by the return spring when the operation was returned to the straight traveling state, for example, if the return spring force is reduced to reduce the operating force of the control lever, Therefore, there is a problem in turning performance such that the side clutch engagement operation is easily delayed and the responsiveness is deteriorated. In addition, since the upper limit of the operating force of the control lever or the installation space of the return spring is limited, there is a problem that a return spring having a large spring force cannot be easily incorporated.

Therefore, the present invention seeks to provide an improved combine by examining these current conditions.

In order to achieve the object, the invention of claim 1 includes a transmission case for driving the left and right traveling crawlers, and transmits the driving force to the left and right traveling crawlers via the left and right side clutches provided in the transmission case. In addition, the left and right side clutch arms for operating the left and right side clutches are provided, the left and right side clutch arms are provided to the transmission case, and the left or right side clutch arm is operated by operating the control lever that the operator tilts left and right. In the combine to turn left or right by switching, a side clutch hydraulic switching body having left and right side clutch cylinders is provided, and the side clutch hydraulic switching body is disposed outside the transmission case via a hydraulic switching bracket, Return to the left and right side clutch arms Left and right elastic body to those that were linked, respectively.

The invention according to claim 2 is the combine according to claim 1, wherein the left and right elastic bodies are tension spring bodies.

According to a third aspect of the present invention, in the combine according to the second aspect, the left and right tension spring bodies are connected between the left and right side clutch arms and the hydraulic pressure switching bracket, and the left and right tension spring bodies are sandwiched between the left and right tension spring bodies. The tension spring bodies are arranged in a distributed manner.

According to a fourth aspect of the present invention, in the combine according to the third aspect, the left and right turning operation arms for switching the left and right side clutches are provided, the left and right turning operation arms are arranged at a high position of the hydraulic pressure switching bracket, and the left and right turning operation arms are arranged. A vertically long turning operation spool is provided below the turning operation arm, and a vertically long piston of the side clutch cylinder is provided in series below the turning operation spool.

The invention according to claim 5 is the combine according to claim 4, further comprising a left turning lever and a right turning lever that are selectively operated by a left / right tilting operation of the control lever, A left turning lever and a right turning lever are connected to each other via a side clutch wire.

The invention of claim 6 is the combine according to claim 1, wherein the left and right elastic bodies are compression spring bodies.

A seventh aspect of the present invention is the combine according to the sixth aspect, further comprising a side clutch shaft provided with the left and right side clutch arms, wherein the hydraulic switching bracket lower end portion and the side clutch shaft of the outer surface of the transmission case are provided. The compression spring body is disposed in a lateral orientation on the outer surface of the.

According to an eighth aspect of the present invention, in the combine according to the seventh aspect, the left and right turning operation arms for switching the left and right side clutches are provided, the left and right turning operation arms are disposed at a high position of the hydraulic pressure switching bracket, and the left and right turning arms are arranged. A vertically long turning operation spool is provided below the turning operation arm, and a vertically long piston of the side clutch cylinder is provided in series below the turning operation spool.

A ninth aspect of the present invention is the combine according to the eighth aspect, further comprising a left turning lever and a right turning lever that are selectively operated by a left and right tilting operation of the control lever, and the left and right turning operation arms are provided with left and right turning arms. A left turning lever and a right turning lever are connected to each other via a side clutch wire.

According to the present invention, a transmission case for driving the left and right traveling crawlers is provided, the driving force is transmitted to the left and right traveling crawlers via the left and right side clutches provided in the transmission case, and the left and right side clutches are disconnected. Left and right side clutch arms to be operated are provided, left and right side clutch arms are provided in the mission case, and the left or right side clutch arm is switched by operating the control lever that the operator tilts to the left and right to turn left or right. The combine includes a side clutch hydraulic pressure switching body having left and right side clutch cylinders, and the side clutch hydraulic pressure switching body is disposed outside the transmission case via a hydraulic pressure switching bracket and returned to the left and right side clutch arms. Left and right elastic bodies for operation Since these are connected, the left and right side clutch cylinders can be configured as a unit as the side clutch hydraulic pressure switching body to improve the assembly workability, while the elastic body in addition to the return spring body of the side clutch. The side clutch can be agile and actuated by a spring force, and the side clutch engagement operation can be prevented from being delayed with respect to a straight-ahead operation for returning the control lever. The turning performance can be improved.

According to the invention of claim 3, the left and right tension spring bodies are connected between the left and right side clutch arms and the hydraulic pressure switching bracket, and the left and right tension spring bodies are arranged in a distributed manner across the side clutch hydraulic pressure switching body. Because it is arranged, the left and right side clutch cylinders and the left and right tension spring bodies can be installed using the hydraulic pressure switching bracket, and there is no need to provide a mounting seat for the left and right tension spring bodies. The cost can be reduced by reducing the number. The left and right tension spring bodies can be compactly attached to the outer surface of the transmission case adjacent to the left and right side clutch cylinders.

According to the fourth and eighth aspects of the invention, the left and right turning operation arms for switching the left and right side clutches are provided, the left and right turning operation arms are disposed at a high position of the hydraulic pressure switching bracket, and the left and right turning operations are performed. A vertically long turning operation spool is provided below the arm, and a vertically long piston of a side clutch cylinder is provided in series below the turning operation spool, so that the turning is performed along the outer surface of the transmission case. The operation spool and the side clutch cylinder can be retrofitted in a vertically long shape, and the side clutch hydraulic pressure switching body can be easily shared for transmission cases with different specifications.

According to the fifth and ninth aspects of the invention, the left and right turning levers that are selectively operated by the right and left tilting operation of the control lever are provided, and the left and right side clutch wires are provided on the left and right turning operation arms. Since the left and right turning levers are connected to each other via the left and right side clutches, the left and right side clutches can be used together with a single conventional wire (or link) while maintaining the left / right tilt angle of the control lever. Compared with the structure in which the left and right side clutch wires are operated to be turned on and off, the pushing and pulling amounts of the left and right side clutch wires can be set separately, the left and right tilting operation force of the control lever can be easily reduced, and the side clutch turning operability can be improved.

According to the seventh aspect of the present invention, the left and right side clutch shafts provided with the left and right side clutch arms are provided, and the outer side surface of the transmission case includes an outer surface between the lower end portion of the hydraulic pressure switching bracket and the side clutch shaft. Since the compression spring body is disposed in a lateral orientation, the compression spring body is in a space closed by one side surface of the transmission case and the left and right side clutch arms between the lower end portion of the hydraulic pressure switching bracket and the side clutch shaft. Can be attached in a compact manner, and it can be easily prevented that the compression spring body is entangled with field grass.

It is a left view of the combine which shows 1st Embodiment of this invention. It is a right view of a combine. It is a top view of a combine. It is a drive system diagram of a combine. It is sectional drawing of a mission case. It is a cross-sectional enlarged view on the mission case output side. It is the perspective view which looked at the operation part from the front. It is a perspective view of a control lever and a mission case. It is front explanatory drawing of a mission case. It is a perspective view of a mission case. It is back surface explanatory drawing of a control lever. It is front explanatory drawing of a control lever attaching part. It is front explanatory drawing of a control lever base end part. It is the perspective view which looked at the control lever base end part from the right front. It is the perspective view which looked at the control lever attachment part from the left front. It is the perspective view which looked at the control lever base end part from the left front. It is a cross-sectional side view of a side clutch valve and a cylinder part. It is a hydraulic circuit diagram of a side clutch valve and a cylinder part. It is front explanatory drawing of a mission case. It is a perspective view of a mission case.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a left side view of an ordinary combine, FIG. 2 is a right side view thereof, and FIG. 3 is a plan view thereof. First, the schematic structure of the ordinary combine will be described with reference to FIGS. In the following description, the left side in the forward direction of the traveling machine body 1 is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side.

As shown in FIGS. 1 to 3, the ordinary combine in the embodiment includes a traveling machine body 1 supported by a pair of left and right traveling crawlers 2 made of rubber crawlers as a traveling unit. At the front part of the traveling machine body 1, a reaping device 3 for capturing uncut cereal grains such as rice (or wheat, soybeans or corn) is mounted by a single-acting lifting / lowering hydraulic cylinder 4 so as to be adjustable up and down. ing.

On the left side of the traveling machine 1, a threshing device 9 for threshing the harvested cereal meal supplied from the reaping device 3 is mounted. In the lower part of the threshing device 9, a grain sorting mechanism 10 for performing swing sorting and wind sorting is arranged. A driver's cab 5 on which an operator is boarded is mounted on the front right side of the traveling machine body 1. An engine 7 as a power source is disposed on the cab 5 (below the driver seat 42). Behind the cab 5 (on the right side of the traveling machine body 1), a grain tank 6 for taking the grain from the threshing device 9 and a grain for discharging the grain in the grain tank 6 toward the truck bed (or container, etc.) A discharge conveyor 8 is arranged. The grain discharge conveyor 8 is tilted toward the outside of the machine so that the grains in the grain tank 6 are carried out by the grain discharge conveyor 8.

The reaping device 3 includes a feeder house 11 that communicates with the handling port 9a of the front portion of the threshing device 9 and a horizontally long bucket-like grain header 12 that is continuously provided at the front end of the feeder house 11. A scraping auger 13 (platform auger) is rotatably supported in the grain header 12. A take-up reel 14 with a tine bar is disposed above the front portion of the take-up auger 13. A clipper-shaped cutting blade 15 is disposed in front of the grain header 12. Left and right weed bodies 16 are provided to project from the left and right sides of the front part of the grain header 12. In addition, a supply conveyor 17 is installed in the feeder house 11. A beater-feeding beater 18 (front rotor) is provided on the feed end side (handle 9a) of the supply conveyor 17. The lower surface portion of the feeder house 11 and the front end portion of the traveling machine body 1 are connected via the lifting hydraulic cylinder 4, and the cutting device 3 moves up and down using a cutting input shaft 89 (feeder house conveyor shaft) described later as a lifting fulcrum. The hydraulic cylinder 4 is moved up and down.

With the above configuration, the tip side of the uncut grain culm between the left and right weed bodies 16 is scraped by the scraping reel 14, and the base side of the uncut grain culm is cut by the cutting blade 15. Due to the rotation drive, the harvested cereal grains are collected near the entrance of the feeder house 11 near the center of the left and right width of the grain header 12. The whole amount of the harvested cereal meal of the grain header 12 is conveyed by the supply conveyor 17 and is configured to be input to the handling port 9 a of the threshing device 9 by the beater 18. The grain header 12 is provided with a horizontal control hydraulic cylinder (not shown) that rotates about the horizontal control fulcrum shaft, and the grain header 12 is adjusted by the horizontal control hydraulic cylinder to adjust the horizontal inclination of the grain header 12. 12, the cutting blade 15, and the take-up reel 14 can be supported horizontally with respect to the field scene.

Further, as shown in FIGS. 1 and 3, a handling cylinder 21 is rotatably provided in a handling chamber of the threshing device 9. A handling cylinder 21 is pivotally supported on a handling cylinder shaft 20 extended in the front-rear direction of the traveling machine body 1. On the lower side of the handling cylinder 21, a receiving net 24 for allowing the grains to leak is stretched. In addition, a spiral screw blade-shaped intake blade 25 projects outward in the radial direction on the outer peripheral surface of the front portion of the handling cylinder 21.

With the above-described configuration, the harvested cereal mash introduced from the handling port 9a by the beater 18 is conveyed toward the rear of the traveling machine body 1 by the rotation of the handling cylinder 21 and is, for example, between the handling cylinder 21 and the receiving net 24. Kneaded and threshed. The threshing of grains or the like smaller than the mesh of the receiving net 24 leaks from the receiving net 24. The sawdust and the like that do not leak from the receiving net 24 are discharged from the dust outlet 23 at the rear of the threshing device 9 to the field by the conveying action of the barrel 21.

In addition, a plurality of dust feeding valves (not shown) for adjusting the conveying speed of threshing in the handling chamber are pivotally mounted on the upper side of the handling cylinder 21 so as to be rotatable. By adjusting the angle of the dust feed valve, the conveying speed (residence time) of threshing in the handling chamber can be adjusted according to the variety and properties of the harvested cereal. On the other hand, the grain sorting mechanism 10 disposed below the threshing device 9 includes a rocking sorter 26 for specific gravity sorting having a grain pan, a chaff sheave, a grain sheave, a Strollac, and the like.

Further, the grain sorting mechanism 10 is provided with a tang fan 29 or the like that supplies sorting wind to the swing sorter 26. The threshing that has been threshed by the handling cylinder 21 and leaked from the receiving net 24 is caused by the specific gravity sorting action of the rocking sorter 26 and the wind sorting action of the Kara fan 29, and the grain (the most important thing such as a refined grain). In addition, it is configured so as to be selected and extracted into a mixture of grain and straw (second product such as grain with branch stems), and sawdust.

The first conveyor mechanism 30 and the second conveyor mechanism 31 are provided on the lower side of the swing sorter 26 as the grain sorting mechanism 10. The grain (first thing) dropped from the swing sorter 26 by the sorting of the swing sorter 26 and the tang fan 29 is collected in the glen tank 6 by the first conveyor mechanism 30 and the cereal conveyor 32. The mixture of grains and straw (second product) is returned to the sorting start end side of the swing sorting plate 26 through the second conveyor mechanism 31 and the second reduction conveyor 33 and is re-sorted by the swing sorting plate 26. The The sawdust and the like are configured to be discharged from the dust outlet 23 at the rear of the traveling machine body 1 to the field.

Furthermore, as shown in FIGS. 1 to 3, the cab 5 is provided with a control column 41 and a driver seat 42 on which an operator sits. The steering column 41 includes an accelerator lever 40 that adjusts the rotational speed of the engine 5, a control lever 43 that changes the course of the traveling machine body 1, a main transmission lever 44 and a sub-transmission lever 45 that switch the moving speed of the traveling machine body 1, A reaping clutch lever 46 for driving or stopping the reaping device 3 and a threshing clutch lever 47 for driving or stopping the threshing device 9 are arranged. Further, a roof 49 for awning is attached to the upper side of the cab 5 via a sun visor support 48.

1 and 2, left and right track frames 50 are arranged on the lower surface side of the traveling machine body 1. The track frame 50 includes a drive sprocket 51 that transmits the power of the engine 7 to the traveling crawler 2, a tension roller 52 that maintains the tension of the traveling crawler 2, and a plurality of track rollers that hold the ground side of the traveling crawler 2 in a grounded state. 53 and an intermediate roller 54 that holds the non-grounded side of the traveling crawler 2. The driving sprocket 51 supports the front side of the traveling crawler 2, the tension roller 23 supports the rear side of the traveling crawler 2, the track roller 53 supports the grounding side of the traveling crawler 2, and the intermediate roller 54 supports the non-traveling crawler 2. It is configured to support the ground side.

Next, the drive structure of the combine will be described with reference to FIG. As shown in FIGS. 4 and 18, a transmission continuously variable transmission 64 having a traveling hydraulic pump 36 and a traveling hydraulic motor 37 is provided in the transmission case 63. The engine 7 is mounted on the upper right side of the front part of the traveling machine body 1, and the mission case 63 is arranged on the front part of the traveling machine body 1 on the left side of the engine 7. Further, an output shaft 65 projecting leftward from the engine 7 and an input shaft 66 projecting leftward from the mission case 63 are connected via an engine output belt 67. A working hydraulic pump 68 that drives the lifting hydraulic cylinder 4 and the like and a cooling fan 69 are arranged in the engine 7, and the working hydraulic pump 68 and the cooling fan 69 are driven by the engine 7.

Furthermore, a handling cylinder drive case 71 (counter case) that pivotally supports the front end side of the handling cylinder shaft 20 is provided. A barrel driving case 71 is provided on the front wall of the threshing device 9. A counter shaft 72 for driving the reaping device 3 and the handling cylinder 21 is pivotally supported on a handling cylinder drive case 71. A tang input pulley 83 is provided at the right end of the tang shaft 76 that supports the tang fan 29. A tang input pulley 83 at the right end of the tang shaft 76 is connected to the output shaft 65 of the engine 7 through a threshing clutch 84 that also serves as a tension roller and a threshing drive belt 85. That is, the red shaft 76 is connected to the output shaft 65 of the engine 7 via the threshing drive belt 85. Then, a barrel driving pulley 86 is provided at the left end portion of the rod shaft 76 on the side away from the engine 7.

Further, a counter input pulley 88 is disposed at the left end portion of the counter shaft 72 on the side away from the engine 7. A counter input pulley 88 at the left end of the counter shaft 72 is connected to the barrel driving pulley 86 via a tension-type barrel driving belt 87. A front end side of the barrel cylinder 20 is connected to a right end portion of a counter shaft 72 extending in the left-right direction via a bevel gear mechanism 75. The engine 7 is configured to transmit power from the engine shaft 7 to the front end side of the handling cylinder shaft 20 via the counter shaft 72 and to rotate the handling cylinder 21 in one direction.

That is, the threshing clutch 84 is turned on and off by the operation of the threshing clutch lever 47 by the operator. When the threshing clutch 84 is turned on, the handling cylinder 21 is driven via the counter shaft 72, and the cereals thrown in from the beater 18 are continuously threshed by the handling cylinder 21.

Furthermore, the left end of the Karatsu shaft 76 is connected to the left end of the first conveyor shaft 77 of the first conveyor mechanism 30 and the left end of the second conveyor shaft 78 of the second conveyor mechanism 31 via the conveyor drive belt 101. The parts are connected. A left end portion of the second conveyor shaft 78 is connected to a left end portion of a crank-shaped swing drive shaft 79 pivotally supported by the rear portion of the swing sorting plate 26 via a swing sorting belt 102. The cereal conveyor 32 is driven via the first conveyor shaft 77, and the first selected grain of the first conveyor mechanism 30 is collected in the glen tank 6. The second reduction conveyor 33 is driven via the second conveyor shaft 78, and the second selected grain (second product) mixed with the sawdust from the second conveyor mechanism 31 is moved to the upper side of the swing sorter 26. Returned to

On the other hand, a beater shaft 82 that pivotally supports the beater 18 is provided. The left end portion of the beater shaft 82 is coupled to the left end portion of the counter shaft 72 via the mowing drive belt 104 and the mowing clutch 105 (tension pulley). A cutting input shaft 89 is provided as a conveyor input shaft that pivotally supports the feed terminal side of the supply conveyor 17. Further, the left end portion of the cutting input shaft 89 is connected to the beater shaft 82 via the cutting drive chain 106 and the

sprockets

107 and 108.

As shown in FIG. 4, a header drive shaft 91 is rotatably supported on the back side of the right side of the grain header 12. The right end of the cutting input shaft 89 is connected to the left end of the header drive shaft 91 extending in the left-right direction via the header drive chain 90. A scraping shaft 93 that pivotally supports the scraping auger 13 is provided. An intermediate portion of the header drive shaft 91 is connected to the right end portion of the drive shaft 93 via a drive drive chain 92.

Also provided is a reel shaft 94 that pivotally supports the take-up reel 14. The intermediate portion of the header drive shaft 91 is connected to the right end portion of the reel shaft 94 via an intermediate shaft 95 and

reel drive chains

96 and 97. The cutting blade 15 is connected to the right end portion of the header driving shaft 91 via a cutting blade driving crank mechanism 98. By the turning-on / off operation of the mowing clutch 105, the feed conveyor 17, the auger 13, the take-up reel 14, and the cutting blade 15 are driven and controlled so as to continuously mow the tip of the uncut grain culm in the field. It is configured.

Further, as shown in FIG. 4, the right end portion of the auger drive shaft 58 is connected to the output shaft 65 of the engine 7 through the auger clutch 56 and the auger drive belt 57 in the form of a tension pulley. The front end side of the lateral feed auger 60 at the bottom of the Glen tank 6 is connected to the left end portion of the auger drive shaft 58 via a bevel gear mechanism 59. A vertical feed auger 62 of the grain discharge conveyor 8 is connected to the rear end side of the horizontal feed auger 60 via a bevel gear mechanism 61. Further, a grain discharge lever 55 for turning on and off the auger clutch 56 is provided. A grain discharge lever 55 is attached to the front surface of the Glen tank 6 behind the driver seat 42 so that the operator can operate the grain discharge lever 55 from the driver seat 42 side.

With the above configuration, the cutting device 3 is driven by the operation of engaging the cutting clutch 105 to operate the cutting blade 15, and the cutting blade 15 cuts the tip side of the uncut grain culm in the field, and the tip side of the corn shaft Is carried into the threshing device 9 from the feeder house 11, and the grain is taken out from the grain sorting mechanism 10 to the glen tank 6.

Next, the structure of the mission case 51 will be described with reference to FIGS. As shown in FIGS. 5 to 6, an input pulley 111 and an input shaft 112 connected to the output shaft 65 of the engine 20 via an engine output belt 67 and the like, a hydraulic pump that continuously changes the rotational force of the input shaft 112, and A hydraulic continuously variable transmission 64 having a hydraulic motor, a sub transmission shaft 116 connected to a transmission output shaft 114 of the hydraulic continuously variable transmission 64 via an idle shaft 115, and a sub transmission gear 116 via a sub transmission gear 117. The counter shaft 118 to be connected, the parking brake 119 provided on the counter shaft 118, the side clutch shaft 122 that pivotally supports the left and right side clutch 121 of the dog clutch pawl type (dog clutch type), and the left and right side brakes provided on the side clutch shaft 122 123, a reduction shaft 124 connected to the side clutch shaft 122, and the left and right axles 12 connected to the reduction shaft 124 And it is provided in the transmission case 51.

Further, as shown in FIG. 6, left and right first reduction gears 126 that connect the reduction shaft 124 to the side clutch shaft 122 via the left and right side clutch 121, and left and right second reduction gears 126 that connect the left and right axles 125 to the reduction shaft 124. The left and right return spring bodies 128 for continuously maintaining the left and right side clutch 121, the left and right side clutch shafts 129 pivotally supported on the front wall of the transmission case 51, and the left and right side clutches are provided. Left and right side clutch forks 130 formed integrally with the shaft 129 are provided.

With the above-described configuration, the left and right side brakes 123 are actuated by the left and right return spring bodies 128, the left and right side clutches 121 are engaged and maintained, and the traveling crawler 2 is moved forward via the drive sprocket 22 provided on the left and right axles 125. Rotation or reverse drive is performed to move the traveling machine body 1 straight (forward or backward). On the other hand, one of the left and right side clutches 121 supported by the left and right return spring bodies 128 in a continuous state is selectively disconnected by the left and right tilting operation of the control lever 14, and the left and right side clutches are separated. 121 is selectively turned off, the driving of either the left or right traveling crawler 2 is interrupted, and the vehicle is turned to the left or right to change the traveling path.

Further, when the operator tilts the control lever 14 to the left or right, the left or right side clutch 121 is turned off by a tilt operation of the control lever 14 or less, and the course of the traveling machine body 1 with a large turning radius. The gentle turning control is executed to correct the leftward or rightward direction. In this state, when the control lever 14 is tilted more than a predetermined direction in the same direction, the left or right side clutch 121 is disengaged and the left or right side brake 123 is engaged and operated, so that the traveling crawler inside the turn 2 is braked, and a rapid turning control is executed to correct the course of the traveling machine body 1 to the left or right with a small turning radius. In either of the gentle turning control (with the side brake 123 turned off) or the sudden turning control (with the side brake 123 engaged), when the operator releases his hand from the control lever 14, the spring force of the return spring body 128, etc. The left or right side clutch 121 enters and returns to move straight (forward or reverse).

Next, an operation structure of the left and right side clutch 121 will be described with reference to FIGS. As shown in FIGS. 7, 8, and 18, a hydraulic unit case 131 is fixed to the traveling machine body 1 at the bottom of the cab 5. A cutting / lifting valve 132 that controls the lifting hydraulic cylinder 4 and a side clutch valve 133 that controls the cutting of the left and right side clutch 121 are disposed in the hydraulic unit case 131. The control lever 14 is connected to the cutting lift valve 132 via the lift switching rod 134, and the lift switching rod 134 is moved up and down by the forward and backward tilting operation of the control lever 14 to switch the cutting lift valve 132, while the side clutch valve 133. The control lever 14 is connected to the control lever 14 via the clutch switch rod 135, and the clutch switch rod 135 is moved up and down by tilting the control lever 14 left and right, and the side clutch valve 133 is switched and operated.

As shown in FIGS. 7, 8, 17, and 18, there are provided left and right side clutch arms 136 that actuate the left and right side clutch 121 and a side clutch hydraulic pressure switching body 138 having left and right side clutch cylinders 137. The left and right side clutch shafts 129 project from the front of the mission case 63 toward the front, and the left and right side clutch arms 136 are fixed to the projecting front ends of the left and right side clutch shafts 129, respectively. A hydraulic switching bracket 139 is detachably bolted to the outside, and a side clutch hydraulic switching body 138 is bolted to the front side of the hydraulic switching bracket 139. Note that the left and right side clutch cylinders 137 are formed by casting the side clutch hydraulic pressure switching body 138.

As shown in FIGS. 9, 10, 17, and 18, the side clutch cylinder 137 has a vertically long piston 142 that protrudes through the cylinder head 141 on the lower surface side of the side clutch hydraulic pressure switch 138. The lower side of the piston 142 protrudes downward from the lower surface of the side clutch hydraulic pressure switching body 138 so that the lower end of the piston 142 is brought into contact with the side clutch arm 136, and the back pressure chamber 137a of the side clutch cylinder 137 is placed inside. A return spring 143 is wound around the upper end side of the piston 142 to be inserted, and the return spring 143 supports the piston 142 to move upward (retract).

Also, left and right turning operation arms 144 for switching the left and right side clutch 121 are provided. The left and right turning operation arms 144 are rotatably arranged via a fulcrum shaft 145 at a high position (upper end portion) of the hydraulic pressure switching bracket 139. On the other hand, a vertically long turning operation spool 147 that protrudes through a spring case 146 is provided on the upper surface side of the side clutch hydraulic pressure switching body 138 (below the left and right turning operation arms 144). The lower end side of the turning operation spool 147 is inserted into the pressure chamber 137b of the side clutch cylinder 137 from the upper surface side of the side clutch hydraulic pressure switching body 138 so as to be able to enter and exit. A swing operation spool 147 is provided in series above the vertically long piston 142 of the side clutch cylinder 137. A return spring 148 is wound around the upper end side of the swing operation spool 147 that passes through the spring case 146, and the return operation spring 148 supports the swing operation spool 147 ascending.

In addition, an axial hole 142a is formed at the upper end of the piston 142 (the end of the side clutch cylinder 137 on the pressure chamber 137b side), and a throttle valve hole 142c that opens to the pressure chamber 137b is formed at the upper end of the axial hole 142a. At the same time, the lower end side of the turning operation spool 147 is inserted into the shaft hole 142 a at the upper end of the piston 142 so as to be able to enter and leave, and the vertically long piston 142 of the side clutch cylinder 137 is provided in series below the turning operation spool 147. Further, a throttle valve passage 147a is formed on the lower end side of the swing operation spool 147, and the pressure chamber 137b and the shaft center hole 142a are configured to communicate with each other through the throttle valve hole 142c and the throttle valve passage 147a. Upper and lower unload passages 142b are formed at two upper and lower portions in the middle of the piston 142, and the back pressure chamber 137a and the shaft center hole 142a are configured to communicate with each other via the lower or upper unload passage 142b.

With the configuration described above, the side clutch valve 133 is switched via the clutch switching rod 135 by the left or right tilting operation of the control lever 43, and the high pressure hydraulic oil in the pressure chamber 137b of the left or right side clutch cylinder 137 is supplied. At that time, the piston 142 moves downward (advances) against the return spring 143 by the high-pressure hydraulic oil, and the left or right side clutch arm 136 is pushed down and rotated. That is, the left or right side clutch 121 is turned off against the return spring body 128, the drive of the left or right traveling crawler 2 is interrupted, the moving path is changed in the left or right direction, and the left or right Turn in the direction.

Further, when the piston 142 moves downward (advances) against the return spring 143, the pressure chamber 137b and the axial hole 142a communicate with each other via the throttle valve hole 142c and the throttle valve passage 147a, and the high pressure operation of the pressure chamber 137b is performed. When oil moves to the back pressure chamber 137a via the lower or upper unload passage 142b, the piston 142 is supported at the position where it has moved downward, and the gentle crawling control in which the traveling crawler 2 on the inside of the rotation rotates is executed. The The side clutch valves 133 are connected to the pressure chambers 137b of the left and right side clutch cylinders 137 via the high pressure hoses 149, and returned to the back pressure chambers 137a of the left and right side clutch cylinders 137 via the oil hose 150. The side clutch valve 133 is connected.

Next, the operation structure of the brake turning control will be described with reference to FIGS. 7, 8, and 11 to 16. FIG. As shown in FIGS. 7, 8, 11, 12, 15, and 16, the base frame 152 is fixed by welding to the rear surface side of the front cover of the front column 151 on which the control lever 43 is disposed. A fulcrum frame 153 is fastened and fixed to the back side of the base frame 152. A left / right tilting fulcrum shaft 154 is provided between the rear frame 151 a and the fulcrum frame 153 at the top of the front column 151. The front / rear tilt fulcrum bracket 155 is fixed to the left / right tilt fulcrum shaft 154, and the front / rear tilt fulcrum shaft 156 is pivotally supported by the front / rear tilt fulcrum bracket 155. The lower end side of the control lever 43 is fixed to the front / rear tilting fulcrum shaft 156, and the control lever 43 is supported upright by a neutral return spring 157.

In addition, an elevating lever 161 is fixed to the front / rear tilting fulcrum shaft 156, and the upper end side of the elevating switching rod 134 is connected to the elevating lever 161 via the elevating link 162, etc., and the control lever 43 is tilted back and forth around the front / rear tilting fulcrum shaft 156. When operated, the elevating / lowering switching rod 134 is moved up and down to switch the mowing elevating valve 132 so as to elevate and lower the mowing device 3.

On the other hand, a straight stopper pin 171 fixed to the fulcrum frame 153 and a turning operation pin 172 fixed to the front / rear tilting fulcrum bracket 155 are provided, and a left turning lever 173 and a right that are selectively operated by a left / right tilting operation of the control lever. A turning lever 174 is provided. The base end side of the left turning lever 173 and the right turning lever 174 is supported on the left and right tilting fulcrum shaft 154 so as to freely rotate (rotate). The middle of the left turning lever 173 is brought into contact with the straight stopper pin 171 and the turning operation pin 172 from the lower side thereof, and the middle of the right turning lever 174 is brought into contact with the straight movement stopper pin 171 and the turning operation pin 172 from the upper side thereof. Make contact.

Further, as shown in FIGS. 12 to 16, a left side clutch wire 175 and a right side clutch wire 176 are provided to connect the left turning lever 173 and the right turning lever 174 to the left and right turning operation arms 144, respectively. An inner 175 a of the left side clutch wire 175 is connected to a wire receiver 153 a provided on the fulcrum frame 153, and an outer 175 b of the left side clutch wire 175 is connected to the distal end side of the left turning lever 173. An outer 176 b of the right side clutch wire 176 is connected to a wire receiver 153 b provided on the fulcrum frame 153, and an inner 176 a of the right side clutch wire 176 is connected to the distal end side of the right turning lever 174.

9 and 10, the left and right wire receivers 139a provided on the hydraulic pressure switching bracket 139 are connected to the outer 175b of the left side clutch wire 175 and the outer 176b of the right side clutch wire 176, respectively. An inner 175a of the left side clutch wire 175 and an inner 176a of the right side clutch wire 176 are connected to the left and right turning operation arms 144, respectively. It should be noted that the operating force of the control lever 43 is greater than that of a structure in which the left side clutch wire 175 and the right side clutch wire 176 share the side clutch 121 disconnection operation force, with a single side clutch wire disconnection operation. Can be reduced.

With the above configuration, the side clutch valve 133 is switched by the left or right tilting operation of the control lever 43, and the pressure chamber 137b and the axial center hole 142a communicate with each other via the throttle valve hole 142c and the throttle valve passage 147a. When the slow crawling control in which the traveling crawler 2 rotates is performed, if the operator further tilts the control lever 43 left or right, the left or right via the left side clutch wire 175 or the right side clutch wire 176 Pulling the right swivel operation arm 144 downward, pushing down the left or right swivel operation spool 147, causing the high pressure hydraulic oil in the pressure chamber 137b to further move down (advance) the piston 142 against the return spring 143, The left or right side clutch arm 136 is further pushed down and turned to turn the left or right side brake 1 3 is actuated to be turned against the spring 128 returns the brake swivel control is executed for braking the traveling crawler 2 of the turning inner. That is, according to the left or right tilting operation amount of the control lever 43, the slow crawling control in which the traveling crawler 2 on the inside of the turn rotates by the side clutch 121 disengaging operation and the inside of the turning by the side brake 123 entering operation. Brake turning control for braking the traveling crawler 2 is executed.

Further, as shown in FIG. 9 and FIG. 10, left and right tension spring bodies 181 for return operation connected to the left and right side clutch arms 136 are provided. The left and right spring seats 182 are provided on the left and right side portions of the hydraulic pressure switching bracket 139, and the left and right spring seats 182 are connected to the upper end sides of the left and right tension spring bodies 181 via the left and right spring force adjusting bolts 183, respectively. The lower ends of the left and right tension spring bodies 181 are connected to the front end of the side clutch arm 136, respectively. That is, the left and right tension spring bodies 181 are connected between the left and right side clutch arms 136 and the hydraulic pressure switching bracket 139, and the left and right tension spring bodies 181 are arranged in a distributed manner with the side clutch hydraulic pressure switching body 138 interposed therebetween. .

With the above configuration, in the slow turning control in which the traveling crawler 2 on the inside of the turn rotates or the brake turning control in which the traveling crawler 2 on the inside of the turn is braked, the control lever 43 tilted to the left or right is brought to the straight position. When returning, the left or right side clutch 121 is agile and actuated by the spring force of both the return spring body 128 and the tension spring body 181, and the traveling crawler inside the turn is interlocked with the return of the straight position of the control lever 43. The forced driving of 2 is resumed without delay. That is, in the harvesting work in which the traveling crawler 2 on the inside of the turn rotates and rotates along the harvesting line of the grain straw during the harvesting operation, the side clutch 121 is engaged from the side clutch 121 cutting operation state. Therefore, the course correction operation when the control lever 43 is operated can be easily matched with the driving operation of a skilled operator. Further, since it is not necessary to excessively increase the spring force of the return spring body 128, the structure of the side clutch 121 can be reduced in size and the assembling workability can be improved.

As shown in FIGS. 1, 6, 9, and 10, a transmission case 63 that drives the left and right traveling crawlers 2 is provided, and the left and right traveling crawlers 2 are connected to the left and right traveling crawlers 2 via left and right side clutches 121 provided in the mission case 63. The left and right side clutch arms 136 that transmit the driving force and actuate the left and right side clutches 121 are provided, and the left and right side clutch arms 136 are provided in the transmission case 63 so that the operator can operate the control lever 43 to tilt left and right. In the combine for switching the left or right side clutch arm 136 to turn left or right, a side clutch hydraulic switching body 138 having left and right side clutch cylinders 137 is provided, and a hydraulic switching bracket 139 is provided outside the transmission case 63. Side clutch hydraulic pressure changeover body 138 While setting the left and right side of the left and right clutch arm 136 to return operation to pull the spring member 181 is ligated respectively. Therefore, the left and right side clutch cylinders 137 can be configured as a unit as the side clutch hydraulic pressure switching body 138 to improve the assembly workability, while the spring force of the tension spring body 181 is added to the return spring body 128 of the side clutch 121. The side clutch 121 can be agile and actuated, and the side clutch 121 can be prevented from being delayed in response to a straight-ahead operation that returns the control lever 43. Performance can be improved.

9 and 10, the left and right tension spring bodies 181 are connected between the left and right side clutch arms 136 and the hydraulic pressure switching bracket 139, and the left and right tension spring bodies 181 are distributed with the side clutch hydraulic pressure switching body 138 interposed therebetween. Are arranged in a shape. Accordingly, the left and right side clutch cylinders 137 and the left and right tension spring bodies 181 can be installed by using the hydraulic pressure switching bracket 139 as well, and there is no need to provide a mounting seat for the left and right tension spring bodies 181 and the number of components is reduced. And cost can be reduced. The left and right tension spring bodies 181 can be compactly attached to the outer surface of the mission case 63 adjacent to the left and right side clutch cylinders 137.

As shown in FIGS. 9, 10, 17, and 18, the left and right turning operation arms 144 that switch the left and right side clutch 121 are provided, and the left and right turning operation arms 144 are arranged at a high position of the hydraulic pressure switching bracket 139. A vertically long turning operation spool 147 is provided below the left and right turning operation arms 144, and a vertically long piston 142 of the side clutch cylinder 137 is provided in series below the turning operation spool 147. Therefore, the swivel operation spool 147 and the side clutch cylinder 137 can be retrofitted along the outer surface of the mission case 63 in a vertically long and compact manner, and the side clutch hydraulic pressure switch 138 can be easily shared with the transmission case 63 having different specifications. .

As shown in FIGS. 9, 10, 12, and 16, a left turn lever 173 and a right turn lever 174 that are selectively operated by a left and right tilt operation of the control lever 43 are provided. The left turning lever 173 and the right turning lever 174 are connected via left and right side

clutch wires

175 and 176, respectively. Accordingly, the left and right side

clutch wires

175 and 176 are compared with the conventional structure in which the left and right side clutch 121 is turned on and off with the use of a single wire (or link) while maintaining the left / right tilt angle of the control lever 43. The push / pull amount can be set separately, the left / right tilting operation force of the control lever 43 can be easily reduced, and the side clutch 121 disengagement operability can be improved.

19 and 20 show a case where a compression spring body 181 ′ is provided in place of the tension spring body 181 as another example of the return operation member connected to the left and right side clutch arms 136, respectively. in this case,
Left and right spring seat arms 182 are provided on the left and right side clutch shafts 129, respectively, and base ends of the left and right spring seat arms 182 are integrally connected to the left and right side clutch arms 136, respectively. Both ends of the compression spring body 181 are connected to the distal end side. That is, both ends of the compression spring body 181 are connected between the left and right side clutch arms 136 via the left and right spring seat arms 182, and the lower end of the hydraulic switching bracket 139 and the side clutch shaft are located outside the front surface of the transmission case 63. The compression spring body 181 is disposed in a lateral orientation on the outer side between 129. Therefore, the left and right spring seat arms 182 are disposed on the left and right side portions of the compression spring body 181, the rear side of the compression spring body 181 is shielded by the front wall of the transmission case 63, and the cylinder head 141 of the left and right side clutch cylinders 137 Since the front surface side of the compression spring body 181 is shielded by the piston 142, it is possible to easily prevent the field grass and the like from being wrapped around the compression spring body 181 during the harvesting operation, and the mud soil etc. in the field can be prevented from being wound around the compression spring body 181. It is possible to prevent the material from adhering to drying and solidifying, and to reduce the cause of malfunction due to adhesion of grass or mud to the compression spring body 181.

Also in the case of the above configuration, in the slow turning control in which the traveling crawler 2 on the inside of the turn rotates or the brake turning control in which the traveling crawler 2 on the inside of the turn is braked, the control lever 43 tilted to the left or right is operated. When returning to the rectilinear position, both the return spring body 128 and the compression spring body 181 cause the left or right side clutch 121 to be agile and actuated, and in conjunction with the return of the control lever 43 to the rectilinear position, the inside of the turn The forcible driving of the traveling crawler 2 is resumed without delay. That is, in the harvesting work in which the traveling crawler 2 on the inside of the turn rotates and rotates along the harvesting line of the grain straw during the harvesting operation, the side clutch 121 is engaged from the side clutch 121 cutting operation state. Therefore, the course correction operation when the control lever 43 is operated can be easily matched with the driving operation of a skilled operator. Further, since it is not necessary to excessively increase the spring force of the return spring body 128, the structure of the side clutch 121 can be reduced in size and the assembling workability can be improved.

As shown in FIGS. 19 and 20, a transmission case 63 for driving the left and right traveling crawlers 2 is provided, and driving force is transmitted to the left and right traveling crawlers 2 via left and right side clutches 121 provided in the transmission case 63. The left and right side clutch arms 136 that actuate the left and right side clutch 121 are provided, the left and right side clutch arms 136 are provided in the transmission case 63, and the left or right side is operated by the operation of the control lever 43 that is tilted left and right by the operator. The combine for switching the clutch arm 136 to turn left or right is provided with a side clutch hydraulic pressure switching body 138 having left and right side clutch cylinders 137, and a side clutch hydraulic pressure switching body via a hydraulic pressure switching bracket 139 outside the transmission case 63. 138 is disposed. Both the back is connected a compression spring 181 'for operation between the right and left side clutch arm 136. Therefore, the left and right side clutch cylinders 137 can be configured as a unit as the side clutch hydraulic pressure switching body 138 to improve the assembling workability. On the other hand, the side clutch 121 is driven by the spring force of the compression spring body 181 ′ in addition to the return spring body 128. Can be actuated quickly, and the delaying operation of the side clutch 121 can be prevented from being delayed with respect to the straight-ahead operation for returning the control lever 43, and the turning performance can be improved by improving the responsiveness. The single compression spring body 181 ′ can return the spring force to the left and right side clutch arms 136, and the left and right side clutch 121 can be used as the single compression spring body 181 to reduce the cost.

As shown in FIGS. 19 and 20, left and right side clutch shafts 129 provided with left and right side clutch arms 136 are provided, and of the outer surface of the transmission case 63, the outer surface between the lower end of the hydraulic pressure switching bracket 139 and the side clutch shaft 129. In addition, the compression spring body 181 'is disposed in a lateral orientation. Therefore, the compression spring body 181 can be compactly attached to the space closed by the one side surface of the transmission case 63 and the left and right side clutch arms 136 between the lower end portion of the hydraulic pressure switching bracket 139 and the side clutch shaft 129. It is possible to easily prevent the field 181 from being entangled with field weeds and the like.

2 traveling crawler 43 control lever 63 mission case 129 side clutch shaft 136 side clutch arm 137 side clutch cylinder 138 side clutch oil pressure switching body 139 oil pressure switching bracket 142 piston 144 turning operation arm 147 turning operation spool 173 left turning lever 174 right turning lever 175 Left side clutch wire 176 Right side clutch wire 181 Tension spring body 181 ′ Compression spring body

Claims

Left and right side clutches having a transmission case for driving the left and right traveling crawlers, transmitting driving force to the left and right traveling crawlers via left and right side clutches provided in the transmission case, and operating the left and right side clutches off In the combine that is provided with an arm, the left and right side clutch arms are provided in the transmission case, and the left or right side clutch arm is switched to turn left or right by operating a control lever that is tilted left and right by an operator.
A side clutch hydraulic pressure switching body having left and right side clutch cylinders, the side clutch hydraulic pressure switching body is disposed outside the transmission case via a hydraulic pressure switching bracket, and returned to the left and right side clutch arms. A combine characterized by connecting left and right elastic bodies.
The combine according to claim 1, wherein the left and right elastic bodies are tension spring bodies.
The left and right tension spring bodies are connected between the left and right side clutch arms and a hydraulic pressure switching bracket, and the left and right tension spring bodies are arranged in a distributed manner across the side clutch hydraulic pressure switching body. Item 3. A combine according to item 2.
It includes left and right turning operation arms for switching left and right side clutches, and the left and right turning operation arms are arranged at a high position of the hydraulic pressure switching bracket, and a vertically long turning operation spool is provided below the left and right turning operation arms, The combine according to claim 3, wherein a vertically long piston of a side clutch cylinder is provided in series below the turning operation spool.
A left turn lever and a right turn lever that are selectively operated by a left and right tilt operation of the control lever are provided, and the left turn lever and the right turn lever are respectively connected to the left and right turn operation arms via the left and right side clutch wires. The combine according to claim 4, which is connected.
The combine according to claim 1, wherein the left and right elastic bodies are compression spring bodies.
A side clutch shaft provided with the left and right side clutch arms is provided, and the compression spring body is disposed in a lateral orientation on an outer surface between the lower end portion of the hydraulic pressure switching bracket and the side clutch shaft among the outer surfaces of the transmission case. The combine according to claim 6, characterized in that
It includes left and right turning operation arms for switching left and right side clutches, and the left and right turning operation arms are arranged at a high position of the hydraulic pressure switching bracket, and a vertically long turning operation spool is provided below the left and right turning operation arms, The combine according to claim 7, wherein a vertically long piston of a side clutch cylinder is provided in series below the turning operation spool.
A left turn lever and a right turn lever that are selectively operated by a left and right tilt operation of the control lever are provided, and the left turn lever and the right turn lever are respectively connected to the left and right turn operation arms via the left and right side clutch wires. The combine according to claim 8, which is connected.