JP2561398Y2 - Travel operating device in combine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial application field The present invention switches the forward / backward movement by tilting the shift lever left and right to switch between forward and backward, and tilting the shift lever forward or backward. The present invention relates to a travel operating device in a combine for performing the following.

(B) Conventional technology Conventionally, when an operation panel is provided in a driving unit, and a speed change lever is positioned in a lateral groove portion of a crank-shaped lever guide groove of the operation panel, a main clutch is disengaged and the body stops, and When the shift levers are located at the left and right ends of the lateral groove portion, the forward / reverse transmission is switched to the forward position or the reverse position with the main clutch still disengaged, or the shift lever is located at the center of the lateral groove portion. And the forward / reverse transmission is switched to the neutral position, and when the transmission lever is tilted from the position of one of the left and right ends of the lateral groove to the forward or backward vertical groove, the transmission valve is switched. Then, the main clutch is engaged by the hydraulic cylinder, the speed of the continuously variable transmission is increased, and then the feedback mechanism of the continuously variable transmission sets the transmission valve to the neutral position. And the speed is changed so that the traveling speed of the body becomes a speed corresponding to the operation position of the shift lever. Travel operating devices in the combine are already known.

(C) Problems to be Solved by the Invention Since the traveling operating device in the above-mentioned known combine was able to perform the gear shifting operation only in the driving unit, every time the vehicle was to be moved during manual handling, It was troublesome and had low efficiency.

In order to solve this problem, the shift valve is operated by other operating means other than the operating unit to cause the vehicle to travel, and when the shift lever provided in the operating unit is erroneously switched at the same time, the following operation is performed. There has been a problem that the traveling operation of the aircraft by the shift lever cannot be performed.

This is because, in order to switch the shift valve from the two systems by the shift lever and other operating means, in particular, there is provided an accommodating ammunition in a linkage mechanism between the shift lever and the shift valve. The ammunition shrinks in response to the switching operation of the shift valve based on a command from another operating means, and plays a role of flexibly preventing the shift lever from forcibly tilting in the front-rear direction unexpectedly.

However, in this case, if the shift lever is simultaneously erroneously operated in the left-right direction, the engaging member in the linkage mechanism that engages with the shift lever is disengaged from the shift lever due to the reaction force from the fusible ammunition, and the shift lever and the shift valve Is disconnected. Once the connection between the shift lever and the shift valve is disconnected, the shift lever and the engaging member cannot be re-engaged even if the operation of other operating means is stopped. There is a problem that the traveling operation of the machine body cannot be performed by the speed change lever, and as a result, the traveling operation device must be disassembled and repaired in order to repair the traveling operation.

(D) Means for Solving the Problems In the present invention, a shift lever capable of tilting forward and backward and left and right is provided in a driving unit of the fuselage, and a transmission is transmitted via an interlocking member by tilting the shift lever in the left and right direction. The forward / reverse transmission provided in the case is switched in the order of a forward position, a neutral position, or a reverse position, and the transmission is shifted through the linkage mechanism by a forward / backward tilt operation of the shift lever in the forward position or the reverse position. A valve is switched, and a hydraulic cylinder to which hydraulic oil is supplied / discharged by switching the transmission valve switches on / off a main clutch provided on the upper transmission side of the forward / reverse transmission and accelerates / decelerates the continuously variable transmission. The speed change position of the continuously variable transmission that has been accelerated / decelerated is fed back to the speed change valve by a feedback mechanism, and is switched by the operation lever. In the combine which returns the transmission valve to the neutral position and shifts the traveling speed of the aircraft to a speed corresponding to the operation position of the transmission lever in the front-rear direction, a pin is provided at one end of a valve arm for switching the transmission valve. And the pin is engaged with the long hole of the link connected to the operating means mounted on the body other than the driving unit, and the link shift valve is operated based on a command from the operating means. By switching the conversion valve, the main clutch is engaged by the hydraulic cylinder, and the continuously variable transmission is operated at an increased speed to allow the vehicle to travel, while the transmission lever is connected to the valve arm of the transmission valve. When the shift valve is switched by the operating means during the mechanism, a flexible bullet for preventing the shift lever from inadvertently tilting in the front-rear direction. When the shift lever is tilted in the front-rear direction at the forward position or the reverse position, one engages with the shift lever and turns, and the other turns in the opposite direction due to one turn. Thus, the left and right engaging members, through which the forward and rearward displacement of the shift lever are transmitted to the valve arm of the shift valve via the above-mentioned fusible ammunition, are interposed. When the shift lever is tilted in the direction, the engaging portions thereof overlap vertically when viewed from the length direction of the shift lever, and when the shift lever performs forward / reverse shifting, engagement of the shift lever with one of the left and right engaging members. The above-mentioned problem is solved by constructing such that it is always maintained and not cut off.

(E) Operation When the shift lever is located in the lateral groove of the guide groove, the main clutch is disengaged and the transmission of the running is cut off. When the shift lever is located in the center of the lateral groove, the forward / reverse transmission is switched to the neutral position. Be replaced.

Further, when the shift lever is tilted to one of the left and right ends of the lateral groove portion, the forward / reverse transmission is switched to the forward position or the reverse position, and when the forward / backward tilt from the standby position is performed, the hydraulic cylinder operates and the main clutch operates. And the speed of the continuously variable transmission is increased, and the body advances or reverses.

Then, when performing other work such as threshing of the hand-cut culm, the shift lever is tilted to the standby position where the forward / reverse transmission is switched to the forward position, for example, in the lateral groove portion, and the vehicle is dismounted. Perform other operations such as threshing of the culm.

In addition, after completing the work there and operating the operating means attached to the fuselage part to move the aircraft to another place, the aircraft moves forward while operating the operating means and threshing processing of the next hand-cut grain culm Stop the aircraft at the place where you want to perform similar operations.

In addition, even when the shift lever provided on the driving unit is erroneously operated in the left-right direction while the operating means is operated, the engaging member engaging with the shift lever is not viewed from the length direction of the shift lever. Since the engaging portions are constituted by left and right engaging members that overlap vertically, the connection between the shift lever and the shift valve is not accidentally disconnected, and subsequent running operation by the shift lever is not affected as before. It can be done without.

(F) Embodiment One embodiment of the present invention will be described with reference to the drawings. A threshing device 3 is mounted on one side of a machine base 2 having a traveling device 1, and an operation panel 4 is sequentially provided on the other side from the front. , A driver's seat 5 and a rice processing unit 6 are provided, an engine is provided below the driver's seat 5, and a pre-processing device 7 including a harvesting device and a cereal culm transport device is pre-processed in front of the threshing device 3. The pre-processing device 7 is mounted so as to be tiltable up and down by a frame, and a single-acting hydraulic cylinder 7a is interposed between the front portion of the machine base 2 and the pre-processing frame to vertically tilt the pre-processing device 7.

A mission case 10 is provided below the threshing device 3 in operation step 8, and the mission case 10 includes:
An input shaft 13 driven by a belt 12 with a tension pulley 11 by the engine is supported above the rear portion, and immediately below the input shaft 13 is a drive split pulley 14 of a belt type continuously variable transmission.
The driven shaft 15 having the driven shaft 15 mounted thereon as the upper part and the pump shaft 16 as the lower part is supported, and the driven shaft 20 to which the driven split pulley 18 provided with the main clutch 17 composed of a multi-plate clutch is mounted near the front upper part. Supported, on the drive shaft 15 side of the driven shaft 20,
A cutting drive shaft 23 driven by the driven shaft 20 via gears 21 and 22 is supported, and the drive shaft is disposed obliquely rearward from the driven shaft 20.
Sub-transmission shaft 25, counter shaft 26, side clutch shaft 27 and left and right crawler drive sprockets 2
Axles 30,30 with bearings 8,28
The forward / reverse transmission clutch 36, which is spline-fitted between the forward gear 33 and the reverse gear 35 rotatably supported at 0, is moved left and right by a main transmission lever 71 to be described later via a shifter 37 and the like. The forward gear 33, the reverse gear 35, and the forward / reverse transmission clutch 36 constitute a forward / reverse transmission. A gear 39 meshed with the forward gear 33 and a gear spline-fitted to the auxiliary transmission shaft 25 are attached to the cylindrical shaft 38 loosely fitted to the mowing drive shaft 23.
A gear 40 meshing with the gear 34 is fixed, and the reverse gear 35 meshes with the gear 40.

Further, the sub-transmission gear 41 is a small-diameter gear, a large-diameter gear, and a medium-diameter gear in order from one side. The sub-transmission gear 41 is slidably fitted to the sub-transmission shaft 25 by an auxiliary transmission lever (not shown). Switching operation via counter shaft 2
6, a large gear 42, a small gear 43, and a medium gear 45, each of which is selectively meshed with each of the large, medium, and small gears of the auxiliary transmission gear 41, are fixed, and are rotatable about the center of the side clutch shaft 27. The supported center gear 46 is engaged with the small gear 43 and has clutches on both sides of the shaft support portion.
48, 50 transmits rotation, but is slidably mounted on the left and right.Side brakes 51, 50 are provided outside each clutch gear 48, 50.
A spool 53, which is mounted oil-tight and is oil-tightly supported above and has a pair of left and right flanges 55 and 56, and a lower end of which is a circumferential groove of the clutch gears 48 and 50, is provided. The bent portions at the upper ends of the shifters 57 and 58 loosely fitted to the inside face the insides of the flanges 55 and 56 of the spool 53, and the oil chambers 60 and 61 into which both ends of the spool 53 are inserted are hydraulic circuits. It is connected to a pump 63 via a steering valve 62 as shown in the figure.

The drive shaft 15, the driven shaft 20, and the axle 30 are arranged in an inverted triangular shape in a side view as shown in FIG. 23 is disposed between the upper drive shaft 15 and the driven shaft 20, and the auxiliary transmission shaft 25, the counter shaft 26, and the side clutch shaft 27, which constitute the acceleration / deceleration mechanism, are located between the driven shaft 20 and the axle 30. Are arranged. With such a configuration, the belt-type continuously variable transmission is located within the height of the transmission case 10, and as shown in FIG.
The transmission case 10 can be arranged in a state in which the driven split pulley 18 and the driven split
When another working machine such as the pre-processing device 7 is arranged beside the working machine, the working machine can be arranged close to the operation step 8 or can be arranged with a sufficient margin.

The operation panel 4 is provided with one operation lever 59 supported by the sphere 64 so as to be tilted in a different direction.
The steering valve 62 and the elevating valve 65 of the hydraulic cylinder 7a of the pre-processing device 7 are integrally connected as a unit A0.
Numeral 65 is attached to a bracket 4c fixed to a horizontal rail connecting left and right columns 4a, which are skeleton members of the operation panel 4, so as to be located at a rear portion (or a front portion).
Each of 65a is linked to an operation lever 59.

Thus, the cam attached to the drive split pulley 14 and expanding and contracting the V-groove width is composed of a fixed cam 74a integral with the transmission case 10 and a movable cam 74b that can rotate and slide. Hydraulic cylinder 73 connected to movable cam 74b
Is connected to a shift valve 75 attached to the pump 63.

FIG. 8 shows a hydraulic circuit of the shift valve 75, the steering valve 62, and the elevating valve 65.
The neutral position of 62 and the lift valve 65 are connected in series by an oil passage 76 so that they both pass to the pump 63 when they are in a neutral state, and the lift valve 65 is pumped more than the steering valve 62 so that it has priority. 63, and both valves 62, 65
The oil supply passages 77, 78 and the oil passage 80 bypassing the valves 62, 65 are provided with throttle valves 81, 82, 83 to restrict the inflow amount, so that each hydraulic operating section can be operated simultaneously. The throttle valve 85 is also interposed in the return oil passage 84 of the elevating valve 65,
The hydraulic oil outflow speed from the single-acting hydraulic cylinder 7a, which is reduced by its own weight, is limited, and the hydraulic oil to the shift valve 75 is supplied through an oil passage 86.

The operation system of the belt-type continuously variable transmission will be described with reference to FIG.
87a is formed by welding a plate having a groove opened from the other side to the main transmission lever 71 at the tip of a round bar having an inverted L shape, and the reverse arm 87b is a plate having an inverted L shape. A groove is formed in the horizontal part toward the main shift lever 71, the engaging portion with the main shift lever 71 is higher than the forward arm 87a, and the bosses of those arms 87a, 87b are provided on one side of the shift lever. It is supported by a single support shaft 87c so that it can tilt forward and backward,
The front ends of the engaging portions of both arms 87a, 87b are wrapped in a plan view, and the rear side of the engaging portion of the backward arm 87b extends to the base of the groove of the forward arm 87a. Further, the side opposite to the respective tilting direction from the groove of each arm 87a, 87b is L
1, as indicated by L2, it is wider than at least the thickness of the main shift lever 71.

Further, arms 88 and 89 projecting forward and backward from the bases of the forward arm 87a and the backward arm 87b are connected to a support shaft 9 constituting a linking mechanism.
The arm 95 at the end of the support shaft 90 is connected to the arm 97 of the intermediate shaft 96 by a rod 97a, and the swing arm 96a is connected to the intermediate shaft 96. A floating gear 96b which is fixed and also serves as an intermediate gear is rotatably supported, and a hook rod 99 is fixed to a gear 98 rotatably supported at the tip of a swing arm 96a. Long hole of plate 101 with tip of rod 99 fixed to rotating shaft 100
The one end of the rotating shaft 100 protrudes out of the transmission case 10, and the arm 103 fixed to this protruding portion is connected to the valve arm 104 of the shift valve 75 attached to the pump 63 by the rod 104a and the receiving pin 103a. And a pair of compression springs 103b, 103b, which are pressed against the right and left of the receiving pin 103a. Further, a gear 105a constituting a feedback mechanism of the continuously variable transmission is engraved on one side of the cylindrical body 105 which is fitted to the fixed cam 74a of the continuously variable transmission and covers the overlapping portion of the movable cam and 74b. A gear 107 fixed to one end of the shaft 106 meshes with the gear 105a, and an intermediate gear 108 fixed to the other end and located in the transmission case 10.
Is meshed with the floating gear 96b. Further, the cylinder 105
Is connected to the lower end of the rod of the hydraulic cylinder 73 by a pin 73a and abuts a receiving pin 74d integral with an arm 74c fixed to the movable cam 74b.

Next, a description will be given of the speed change operation means and the accommodating mechanism operated on the ground. The valve arm 104 of the speed change valve 75 attached to the pump 63 is connected to the rod 1 as shown in FIG.
04a and the pin 104b at the extension end.
The plunger S-1 of the solenoid S is connected to an elongated U-shaped link 104c loosely fitted to the pin 104b, and the pin 104b is connected to the pin 104b in a state where the valve arm 104 is in a neutral position. As shown in the drawing, the push button type switch S1, which is a human-made operating tool inserted into the circuit of the solenoid S, is located at a lower portion near the starting end of the feed chain 3a of the threshing device 3. And so on.

Further, an L-shaped arm 109 in which a front-rear rotation support shaft 71a of the main speed change lever 71 is fixed to the upper portion is supported by a fulcrum shaft 109a so as to be able to turn left and right. Since the main transmission lever 71 is located in the middle of the horizontal groove that is in the neutral position, the forward-reverse transmission clutch is connected to the arm 110 that constitutes the interlocking member that operates the shifter 37 via the rod 111. 36 is in the neutral position, and when it is tilted in the left-right direction, the forward / backward switching is performed. In this state, the hydraulic cylinder 73 contracts, the groove width of the drive split pulley 14 becomes maximum, and the main clutch 17
Is in a non-transmission state in which the arm 95 is tilted forward or backward from such a switching state, whereby the arm 95 is rotated downward (increased in speed), and the gear 98 is rotated downward together with the swing arm 96a. Pivot, the hook rod 99 integral therewith causes the plate 101 to pivot downward, thereby opening the shift valve 75, and hydraulic oil from the pump 63 is sent to the hydraulic cylinder 73,
The hydraulic cylinder 73 extends while receiving the receiving pin 74 with the connecting plate 105b.
Since d is depressed, the connecting plate 105b and the movable cam 74b rotate to increase the speed. When the movable cam 74b rotates,
The gear 105a of the cylindrical body 105 integrated therewith rotates, and the gear 107 meshing therewith, and the intermediate gear in the transmission case 10
108, the gear 98 is rotated via the floating gear 96b, and the hook rod 99 integrated therewith is rotated in the direction of ascending rotation, so that the arm 103 is rotated clockwise in the figure, and the transmission valve 75 is rotated. The closing operation is sequentially performed, and the predetermined speed-change operation is completed. Conversely, when the main transmission lever 71 is tilted toward the neutral position, the respective parts perform operations opposite to those described above, and the hydraulic cylinder 73 is reduced and decelerated. At this time, the rotation angle of the movable cam 74b is set to a gear supported in the transmission case 10.
Since the feedback is provided to the transmission valve 75 by 108, 96b, 98, the hook rod 99, the plate 101, and the like, it is transmitted accurately and mud, straw, and the like do not adhere to the feedback mechanism. Since the hook rod 99 is located at the axial center end of the elongated hole 102 formed in the plate 101 at the neutral position, a slight backlash is required at the connecting portion of the members in the mechanical operation transmission system. However, even if the hook rod 99 rotates at a constant speed together with the gear 98, the
The rotation speed of 101 is high, and the speed change valve 75 is rapidly operated near the neutral position, and the rotation speed decreases as the speed approaches the shift completion position.

Next, the operation system of the side clutch and the side brake will be described. The distal end side of the operation rod 113 connected to the brake petal 112 is loosely fitted to a pipe 115 fixed to a metal holder 114 integrated with the cylinder 105 with a pin. When the hydraulic cylinder 73 is contracted, the end of the pipe 115 is
The intermediate portion is connected to a link 116 having an inverted V shape in a side view by a pin 116a, and when returning the main shift lever 71 from a desired shift position to the neutral position, the intermediate portion is neutral. On the near side of the position, the pipe 115 moves the receiving nut 113a fixed to the operation rod 113 to the right side in FIG. 1, and a portion fitted to the intermediate driven shaft 20 of the link 116 includes:
A cam 117 for connecting and disconnecting the main clutch 17 is provided,
As a result, the main clutch 17 is disengaged before the neutral position. The lower end of the link 116 is located on the side clutch shaft 27.
A brake arm 119 integral with a brake shaft 118 supported at a portion corresponding to one end of the brake shaft 118 is connected by a brake rod 121 to a brake shoe 122 attached to the brake shaft 118 and a side brake 52 via a ball clutch 123. I am wearing it.

Therefore, when the brake pedal 112 is depressed or the main shift lever 71 is returned to the neutral position, the main clutch 17 is first disengaged, the transmission is cut off, and the link 116 rotates clockwise in FIG. Lower end is brake rod 12
1 to sequentially rotate the brake arm 119, whereby the side brake 52 is
, The side clutch shaft 27 stops, and at that time, the other side clutch gear 48 is also engaged, so that the left and right crawlers simultaneously stop.

In addition, 127 is a pin protruding from the tip of an arm fixed to each end of the pair of shifter shafts 120, 120. When a pair of left and right side clutch levers is provided on the operation panel 4, those levers are linked. It is connected via The hydraulic circuit in that case is as shown in FIG.

Next, the operation of the speed change valve will be described with reference to FIG. 10. When the main speed change lever 71 is set to the neutral position, the valve body of the speed change valve 75 composed of a rotary valve moves to the deceleration side by 12.7
° (neutral holding position)
The B port is opened, and the sliding rod of the hydraulic cylinder 73 is driven by the hydraulic pressure (for example, 75 k
g / cm2) to maintain neutral.
In this state, when the main shift lever 71 is tilted to an appropriate shift position such as V1 to V9 in order to allow the aircraft to travel at a desired speed, for example, to the position of V9, the valve body opens the A port and the hydraulic cylinder 73 becomes Extends the belt-type continuously variable transmission to increase the speed, and the feedback mechanism follows the valve arm.
Rotate 104 back to rotate the valve body to the shift holding position,
The shift is completed. In this shift holding position, the valve body is stopped at a position inclined to the speed increasing side by 3 ° to the speed increasing side, so that the hydraulic oil pressurizes the A port at about 15 kg / cm2 and the driven split pulley
The gearshift position is maintained because it opposes the spring pressure of 18.

When the main shifting lever 71 is tilted to the neutral position,
As the valve element rotates to the position, the B port opens, the hydraulic cylinder 73 contracts, and is sequentially decelerated. Finally, the piston comes into contact with the end of the cylinder, and the valve element returns to the neutral holding position by the feedback mechanism. . Meanwhile, the hydraulic cylinder 73 disengages the main clutch 17 and
3, side brake 52 via link 116 and arm 119
Brake operation, and at this time, the other clutch gear 48 is engaged, so that the brake operation state is changed to the hydraulic cylinder
The vehicle is not started due to the leakage of the shift valve 75, which is maintained by the valve 73.

When the operating lever 59 is tilted to the left or right to rotate the vehicle while traveling, that is, with the valve body holding the shift position, the steering valve 62 is in the neutral state. To either one of the clutch gears 48
(50) is released, and subsequently the side brake 51 (52) is operated.

On the other hand, in a state where the steering valve 62 is in the neutral position, the hydraulic oil is being pumped to the shift valve 75 through the neutral position of the steering valve 62 (without the throttle valve). , Passing through the detour oil path 80,
The pressure is reduced by the distribution, the hydraulic pressure to the shift valve 75 decreases,
As a result, the hydraulic oil on the A port side of the hydraulic cylinder 73 partially flows out of the tank port T by a spring and returns to the tank through the shift valve having the shift holding angle, so that the hydraulic cylinder 73 contracts, and the belt type The continuously variable transmission is decelerated until the hydraulic pressure and the spring pressure are balanced, the aircraft can be turned at a low speed, and the hydraulic cylinder is operated until the side clutch disengagement operation and the side brake operation are not performed. Hydraulic oil pressure to 73 is limited by a throttle valve in the bypass oil passage.

In the above-mentioned combine, during work or traveling on the road, when the main transmission lever 71 is tilted left and right from the neutral position and the forward / reverse transmission clutch 36 is moved left and right, the state is switched to forward or reverse, and the continuously variable transmission is connected to the main transmission lever. Tilt 71 forward from the neutral position to increase forward speed, and tilt backward to increase reverse speed.

Reference numeral 146 denotes a control pin protruding from a side of the main transmission lever 71 near the base, 148 denotes a control arm, and 149 denotes a throttle valve and a check valve interposed in an oil passage.

When the operating lever 59 is tilted to the left, the steering valve
62 is switched to pump hydraulic oil from the pump 63 to the oil chamber 60 on the left side, whereby the spool 53 slides to the right side,
The flange 55 on that side is a shifter that is pivoted in the middle
Since the upper part of 57 is tilted to the right, the left clutch gear 48
In this state, the aircraft slowly turns left, and when the shifter 57 is further tilted, the side brake 51 is activated, and the aircraft rapidly turns left.

When turning the body to the right, tilting the operation lever 59 to the right causes the spool 53 to slide in the opposite direction to the above, so that the body turns to the right.

Furthermore, when adjusting the cutting height, when rotating the aircraft,
Alternatively, when the pre-processing device 7 is moved up and down during traveling on the road, the operation lever 59 is tilted rearward and the ram of the up-and-down valve 65 is moved.
When the hydraulic oil from the pump 63 is pressed down to the hydraulic cylinder 7a for raising and lowering and the pretreatment device 7 is raised and tilted forward, the ram 65a is raised and the hydraulic oil in the hydraulic cylinder 7a is released. The pretreatment device 7 is pressed out to the tank by its own weight, and the pretreatment device 7 descends. When the hand is released from the operation lever 59, it returns to the neutral position by a return spring or the like.

Thus, when the threshing process is manually performed on the grain culm manually cut on the headland or the like in the field, the driver operates the threshing device 3 to drive the main transmission lever 71 near the place where the hand-grained grain culm is present. Is returned to the neutral position, the machine is stopped, and the main speed change lever 71 is tilted to the forward standby position to get off, and the hand-cut culm is supplied to the start end of the feed chain 3a of the threshing device 3 for threshing.

Then, when the threshing process in the vicinity of the stop position is completed and the aircraft is moved to the next place, the driver does not board the driving unit, and when the artificial operation tool is the switch S1, when the operator presses the switch, the solenoid S is pressed. Plunger S-1
Pulls the link 104c while compressing the flexible bullet 103b, the valve arm 104 rotates counterclockwise in FIG. 5, the shift valve 75 switches to the speed increasing side, and the hydraulic cylinder
73 is extended and the aircraft moves forward while being accelerated.

In the meantime, the forward arm 87a is urged to rotate forward by the reaction force of the accommodating bullet 103b, but is prevented from rotating by engaging with the main transmission lever 71. In this state, when another person tilts the main transmission lever 1 at the forward standby position toward the reverse standby position, the main transmission lever is disengaged from the forward arm at the intermediate N position in the target example shown in FIG. May rotate forward, and the reverse arm 87a may rotate backward in the opposite direction via the rod 93.
The disengagement can be prevented by the wrapping of the engaging portions of 87a and 87b.

Further, as the continuously variable transmission proceeds, the feedback mechanism operates as described above, and the arm 103 rotates clockwise, thereby compressing the right-handed elastic bullet 103b in the figure to be stronger than the electromagnetic force of the solenoid. (If the electromagnetic force of the solenoid S is strong, the link 104c and the plunger S-
1 and a valve spring 104 is rotated back to return to the neutral position and reach a predetermined vehicle speed. Immediately before reaching the target location, the switch S1 is turned off.
When set to F, the plunger S-1 is pushed and urged.
Is returned to the predetermined position with the link 104c, and the flexible bullet 103b compressed at the time of feedback pushes the valve arm 104 leftward in FIG. 5 to rotate the valve arm 104 clockwise, so that the transmission valve 75 Is switched to the deceleration side, and the hydraulic cylinder 73 performs the contracting operation, which is fed back to return the valve arm 104 to the neutral position, so that the aircraft stops.

(G) Effect of the Invention Since the present invention is configured as described above, when the driver gets off and performs work other than harvesting and threshing work such as manual handling work, the shift lever 71 is moved forward or backward in the lateral groove portion. In order to perform ground work after shifting to and then moving to the next work place, the aircraft can be moved by operating the operation means S1. Therefore, the driver does not need to operate the shift lever 71 to move the aircraft after boarding the driving section again, thereby eliminating the need for troublesome maneuvering operations as in the prior art, and making the aircraft easy and high in height. Can be moved to efficiency.

Also, during the operation of the operation means S1, even if another person mistakenly operates the shift lever 71 provided in the driving unit at the same time, the left and right engagement members 87a provided in the linkage mechanism of the shift lever 71 and the shift valve 75, The 87b reliably maintains the connection between the shift lever 71 and the shift valve 75, so that the running operation of the aircraft by the shift lever 71 is secured and the running operation device must be disassembled and repaired each time. Can be eliminated.

[Brief description of the drawings]

The drawings show an example of the present invention. FIG. 1 is a side view in which a part of a transmission is cut away, FIG. 2 (a) is an exploded sectional view of a rear part and a front part, and FIG. FIG. 3 is a longitudinal sectional view of the same upper part, FIG. 4 is a left side view of the same, FIG. 5 is an exploded perspective view of a speed change operation system, and FIG. FIG. 7 (b) is a plan view, FIG. 7 (b) is an exploded perspective view, FIG. 7 (a) is a plan view of the target example, FIG. Fig. 9 is a hydraulic circuit diagram of a side clutch lever system, Fig. 9 (a) is an operation pattern diagram of a shift valve, Fig. 10 (b) is a hydraulic diagram of the same, and Fig. 11 is an operation panel. FIG. 12 is a perspective view of the combine. DESCRIPTION OF SYMBOLS 1 ... Traveling device, 2 ... Machine, 4 ... Operation panel, 10 ... Mission case, 14 ... Drive split pulley, 17 ... Main clutch, 18 ... Driven split pulley, 36 ... Clutch (forward / reverse transmission), 71: Main shift lever (shift lever), 73: Hydraulic cylinder, 75: Shift valve, 87a
... Advancing arm (engaging member), 87b ... Reverse arm (engaging member), 90 ... Support shaft (linking mechanism), 103b ...
104 valve arm, 104b pin, 104c link, 105a gear (feedback mechanism), 111 rod (interlocking member), S1 switch (operation means)

Claims (1)

(57) [Scope of request for utility model registration] A transmission lever (71) capable of tilting forward / backward and left / right is provided in a driving section of the fuselage, and a transmission case (111) is provided via an interlocking member (111) by a right / left tilting operation of the shift lever. 10) Forward / reverse transmission (33),
(35) and (36) are switched in the order of the forward position, the neutral position or the reverse position, and the linkage mechanism (90) is rotated by the tilting operation of the shift lever in the forward or backward position at the forward position or the reverse position. The transmission valve (75) is switched via the transmission valve, and the hydraulic cylinder (73) supplied and discharged with the hydraulic oil by switching the transmission valve (75) transmits the transmission of the forward / reverse transmission (33), (35), (36). The main clutch (17) provided on the side is engaged and disengaged, and the continuously variable transmissions (14) and (18) are accelerated and decelerated, and the speed change position of the continuously increased and decelerated transmission is determined by a feedback mechanism (105a). ..Returning the transmission valve switched by the operation lever to the neutral position by feeding back to the transmission valve, whereby the traveling speed of the aircraft becomes a speed corresponding to the operation position of the transmission lever in the front-rear direction. In a combine which changes the speed in such a manner, a pin (104b) is erected at one end of a valve arm (104) for switching the shift valve (75), and the pin (104b) is mounted on another body part other than the operating unit. The long hole of the link (104c) connected to the means (S1) is engaged, and the conversion valve (75) is switched by the switching operation of the transmission valve of the link (104c) based on a command from the operating means to switch the hydraulic valve (75). 73), the main clutch (17) is engaged, and the continuously variable transmissions (14) and (18) are operated to increase the speed to allow the vehicle to travel. A flexible bobbin (103b) for preventing a shift lever from inadvertently tilting in the front-rear direction when the shift valve is switched by the operating means during a mechanism for linking the valve with the valve arm (104); Shift lever in forward position Or, when the tilting operation is performed in the front-rear direction at the reverse position, one of the shift levers engages and turns, and the other turns in the opposite direction due to one turn, thereby causing the shift lever to rotate. The longitudinal displacement is the same
Left and right engaging members (87a) and (87b) transmitted to the valve arm (104) of the transmission valve via the b) are interposed, and the left and right engaging members (87a) and (87b) When the shift lever is tilted in the left-right direction, the engaging portions thereof overlap vertically when viewed from the length direction of the shift lever, and when the shift lever performs forward / reverse shifting, either the shift lever or the left or right engaging member is used. A travel operating device in a combine, characterized in that the engagement with (87a) and (87b) is always maintained so as not to be disconnected.