JPH09123780A - Speed changing lever supporting structure in moving agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism which enables a hydraulic continuously variable transmission to perform an accurate speed changing operation according to the swivel operation of a main speed changing lever. SOLUTION: The swivel fulcrum shaft 28 of a main speed changing lever 14 freely swung for performing a speed changing operation for a hydraulic continuously variable transmission 17 for speed-changing the rotation driving force of an engine in a continuously variable manner and the work shaft 34 of the hydraulic continuously variable transmission 17 are connected to each other via a connecting tool 33. The fulcrum shaft 28 is connected to and supported in the hydraulic continuously variable transmission 17 by two or more stators 26 and 43 such that the application line of a force exerted on the fulcrum shaft 28 side forms a triangle with the fulcrum shaft 28 side as a vertex when seen from the front side. The stator 43 is directed attached to the fulcrum shaft 28 by a plurality of nuts 39 and 41 engaged with the fulcrum shaft 28 for adjusting the operation load of the main speed changing lever 14 for preventing fluctuations in the swinging angle of the main speed changing lever 14 by a reactive force from the hydraulic continuously variable transmission 17 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear shift lever supporting structure in a mobile agricultural machine such as a combine harvester.

[0002]

2. Description of the Related Art Conventionally, mobile agricultural machines, such as combine harvesters, are configured to travel by transmitting a driving force from an engine to a traveling device via a transmission. The speed is changed by controlling the transmission by the swinging movement of the. In the case where the transmission is equipped with a hydraulic continuously variable transmission (HST), the swing fulcrum side of the main gear shift lever and the operating shaft (trunnion shaft) side that shift-operates the HST are connected by a connecting tool. The HST is switched to a gear ratio corresponding to the swing setting position of the gear shift lever to continuously change the traveling speed of the machine body.

[0003]

However, when the main speed change lever is swung or when some external force is applied to the main speed change lever, the main speed change lever is in the direction other than the swing (rotation) direction on the swing fulcrum shaft side. Force is applied in the direction. Therefore, due to the force applied to the fulcrum shaft side, the fulcrum shaft or the stay supporting the fulcrum shaft is bent, and the HST is irrelevant to the operator's intention to operate through the connecting tool connecting the two shafts. It had the drawback of being manipulated. That is, an error may occur in the gear ratio of the continuously variable transmission corresponding to the set position of the main transmission lever or in the neutral position of the main transmission lever.

[0004]

The structure for supporting the speed change lever in the mobile agricultural machine according to the present invention for solving the above problems is provided with a hydraulic continuously variable transmission 17 for continuously changing the rotational driving force of the engine. That is, the main transmission lever 14 for performing the shift operation of the hydraulic continuously variable transmission 17 is swingably provided, and the swing fulcrum shaft 28 of the main transmission lever 14 and the operating shaft 34 of the hydraulic continuously variable transmission 17 are provided. By providing a coupling tool 33 for connecting between the hydraulic continuously variable transmission 17 and the hydraulic continuously variable transmission 17 having a structure in which the speed change ratio is continuously set according to the swing angle of the main transmission lever 14, Left and right sides and the fulcrum shaft 2
8 side and the left and right positions of the fulcrum shaft 28 side so that the line of action of the force applied from the main shift lever 14 to the fulcrum shaft 28 side forms a triangular shape with the fulcrum shaft 28 side as an apex in a front view. The first feature is that the left and right positions on the hydraulic continuously variable transmission 17 side are connected and supported by two or more stays 26 and 43.

Further, the main transmission lever 14 on the fulcrum shaft 28
Nuts 39, 4 for adjusting the tightening force of the connecting portion with the side
1 is screwed to the fulcrum shaft 28, and the nuts 39 and 41
The second feature is that the stay 43 is directly attached to the fulcrum shaft 28 by the above.

[0006]

FIG. 1 is a perspective view of a combine to which the present invention is applied. A body frame 1 is supported by a traveling device 2, and a body 3 is formed on the body frame 1. A pre-processing unit 4 is mounted in front of the machine body 3 so as to be able to move up and down and swing with respect to the machine body 3.
A threshing unit (not shown) is provided on the left rear side of
By a carrier (not shown) provided between the threshing unit and the pre-processing unit 4, the grain stalks cut by the pre-processing unit 4 are conveyed to the threshing unit.

On the other hand, a driver's seat 7 having a seat 6 and the like is installed above the right side of the machine body 3, and as shown in FIG. 2, a front operation panel 8 is provided in front of and on the left side of the seat 6.
And a side operation panel 9 are provided. The side operation panel 9 is provided with a sub-transmission lever guide 11 and a main transmission lever guide 12.
1 and a main transmission lever 14 protrudes from the main transmission lever guide 12, respectively.

At this time, both levers 13 and 14 are configured to be swingable back and forth or left and right along the respective lever guides 11 and 12, as will be described later. On the other hand, in the machine body 3 below the driver's seat 7, there is provided a mission case 16 in which a transmission is constituted by gears and the like and an engine (not shown) as shown in FIGS. The case 16 is equipped with a hydraulic continuously variable transmission (HST) 17 for traveling speed shifting, which continuously changes the rotational driving force of the engine and outputs it to the transmission side.

The HST 17 is the main transmission lever 14
And the auxiliary transmission gear in the transmission is configured to be operated by the auxiliary transmission lever 13, and the rotational driving force of the engine is changed by the operation of the levers 13 and 14 and transmitted to the traveling device 2. The body 3 travels by the traveling device 2. At this time, the traveling speed of the body 3 corresponds to the gear ratio of the HST 17, and the gear ratio of the HST 17 corresponds to the swing angle of the main shift lever 14.

That is, when the main transmission lever 14 is located in the forward transmission portion 12a of the main transmission lever guide 12, the forward traveling speed of the machine body 3 continuously increases as the main transmission lever 14 is swung forward. , As it swings rearward, it decreases steplessly, and when it is located in the reverse gear shift portion 12c, the vehicle body 3 travels backward at a speed corresponding to the swing angle of the main shift lever 14 as described above. When the main gear shift lever 14 is located at the neutral portion 12b, the HST 17 becomes neutral and the fuselage 3 does not run.

Next, the connecting structure between the HST 17 and the main shift lever 14 and the transmission and the sub shift lever 13 will be described. As shown in FIGS. 3 and 4, the sub-transmission lever 13 is supported by a fulcrum shaft 18 via a boss 19 so as to be swingable back and forth. A moving arm 21 is provided. On the other hand, from the transmission case 16, an auxiliary shift shifter shaft 22 for switching the auxiliary shift gear for auxiliary shifting the traveling speed in the transmission by swinging operation is provided so as to swing freely, and the auxiliary shift shifter shaft 22 is provided on the auxiliary shift shifter shaft 22. Is provided with a shifter shaft arm 23 for swinging the auxiliary shift shifter shaft 22. The arm 21 and the shifter shaft arm 23 are connected by the auxiliary transmission rod 24. With the structure described above, the auxiliary transmission shifter shaft 22 swings as the auxiliary transmission lever 13 swings back and forth, and the auxiliary transmission gear shifts. Can be switched.

Further, the connecting mechanism between the main shift lever 14 and the HST 17 will be described with reference to FIGS. The HS attached to the mission case 16 as described above
A stay 26 is erected from the upper end portion of the left side of T17 {right side in front view (FIG. 3)}.
A bracket 27 is provided so as to protrude rightward (leftward in a front view) in the vicinity of substantially the center in the vertical direction. The bracket 27 is provided with a fulcrum shaft 28 protruding rightward, and an arm 29 is supported on the fulcrum shaft 28 so as to be swingable back and forth.

At this time, a boss 29a is provided at the upper end of the arm 29 in the front-rear direction, and a fitting portion 14a protruding forward is provided at the base end of the main transmission lever 14. The fitting portion 14a is rotatably fitted into the boss 29a. Also, the main shift lever 14
A spring fixing portion 31 projecting rightward is also provided at the base end of the arm 29, and is connected to the right side surface of the arm 29 by a spring 32.

That is, the main shift lever 14 is swingable back and forth around the fulcrum shaft 28 and is swingable left and right around the fitting portion 14a. Spring 3 in the left-right direction
2 urges the fitting portion 14a rightward about the fitting portion 14a. Accordingly, the main shift lever 14 swings back and forth and left and right along the main shift lever guide 12, that is, swings back and forth in the forward shift portion 12a and the reverse shift portion 12c, and left and right swing in the neutral portion 12b (the leftward swing Against the urging force of the spring 32).

Below the arm 29, one end of a main speed change rod 33, which is a connecting tool, is connected, and the other end of the main speed change rod 33 is an oscillating shaft which is an operating shaft for changing the speed of the HST 17. It is connected to an HST trunnion 36 attached to the trunnion shaft 34. With the above structure, the arm 29 is vertically swung by swinging the main shift lever 14 back and forth, and the main shift rod 33 is vertically moved by the vertical swing of the arm 29. The vertical movement of the main shift rod 33 causes the HST trunnion 36 to move.
Oscillates left and right, and by the left and right oscillating of the HST trunnion 36, the trunnion shaft 34 oscillates and the HST 17 is operated to change gears. This causes the trunnion shaft 34 to oscillate at an angle corresponding to the oscillating angle of the main transmission lever 14, so that the HST1
7 is switched to a gear ratio corresponding to the swing angle of the main gear shift lever 14. 3 and 4 show a state in which the main shift lever is located at the neutral portion 12b and the HST 17 is in neutral.

A brake mechanism for preventing the swing of the arm 29 is provided between the arm 29 and the bracket 27 side, and the main transmission lever 14 is provided by the brake mechanism.
The operating load is applied to. In the present embodiment, the brake mechanism holds the arm 29 by the plate 42 on the fulcrum shaft 28 side and the brake lining 38, and the brake lining 3 by the nuts 39 and 41 screwed to the right side of the brake lining 38 on the fulcrum shaft 28.
By adjusting the force with which the arm 8 presses the arm 29, the force (braking force) that holds the arm 29 by the plate 42 and the brake lining 38 can be adjusted. The braking force causes the arm 29 to swing due to the reaction force from the HST 17, and the main transmission lever 14
The setting position of is adjusted so that it does not change.

On the other hand, the fulcrum shaft 28 is fixed between the nuts 39 and 41 on the fulcrum shaft 28 by one end of the stay 43 and nuts 39 and 41, and the other end of the stay 43 is bolted to the upper right end of the HST 17. It is fixed by a fixing member such as 40. That is, one end of the fulcrum shaft 28 is attached to the HST 1 by the stay 26 via the bracket 27.
7 to the left upper end of the HST1 by the stay 43 at the other end.
7 is fixed. At this time, the support portion of the arm 29 on the fulcrum shaft 28 and the stays 26, 4 on the HST 17 are
When it is connected to the attachment portion of No. 3, it becomes a substantially triangular shape in a front view (see the imaginary line in FIG. 3).

As described above, the main transmission lever 14 is used for the arm 2
Since it is supported by the fulcrum shaft 28 via 9, the main transmission lever 14 is swung back and forth or other main transmission lever 1
When an external force is applied to the shaft 4, a force in a direction other than the swing (rotation) direction of the arm 29 (main transmission lever 14) is applied to the fulcrum shaft 28 side. However, the fulcrum shaft 28 is HS
Since it is connected and supported on the T17 side, the force applied to the fulcrum shaft 28 side is applied to the HST1 via the two stays 26 and 43.
7 side receives.

At this time, since the stays 26 and 43 support the fulcrum shaft 28 as described above, the HST 17 side applies the force applied to the fulcrum shaft 28 side to the H of the stays 26 and 43 shown in FIG.
When the attachment portion to the ST17 side is connected, it is received by an action line 45 having a triangular shape with the fulcrum shaft 28 side as the apex. Therefore, the bending of the fulcrum shaft 28 and the stays 26, 43, etc. is reduced,
Even when a force in a direction other than the swing direction of the arm 29 is applied to the fulcrum shaft 28 via the main shift lever 14 as described above, the distance between the fulcrum shaft 28 and the trunnion shaft 34 on the HST 17 side does not vary much. That is, the operation amount of the HST 17 (the trunnion shaft 34) with respect to the swing amount of the main shift lever 14 becomes accurate, and the H shift amount corresponding to the swing set position of the main shift lever 14 becomes high.
Since the error in the gear ratio of ST17 or the neutral position of the main gearshift lever 14 is reduced, the machine body 3 travels at a speed corresponding to the setting of the main gearshift lever 14, and the neutral position of the main gearshift lever 14 and the neutral position of the HST are set. No deviation occurs.

The main gearshift lever 14 is used to drive the HST 17
When operating, the HST 17 to HST trunnion 3
A reaction force is generated which causes 6 to return to the neutral position.
Then, the reaction force is applied to the arm 29 via the main transmission rod 33, but as described above, the arm 29 is caused by the braking force.
Does not swing, the reaction force is applied to the fulcrum shaft 28 side. The reaction force applied to the fulcrum shaft 28 side is also applied to the stays 26, 4
Since it is received by the HST 17 side via 3, the variation in the distance between the fulcrum shaft 28 and the trunnion shaft 34 due to the reaction force is small. That is, since the reaction force from the HST 17 is also received by the HST 17 side via the stays 26 and 43, the reaction force from the HST 17 corresponds to the swing setting position of the main transmission lever 14 which is generated when the trunnion shaft 34 moves to the neutral side. The error of the gear ratio of the HST 17 or the neutral position of the main gear shift lever 14 is smaller than the conventional one.

Since the right end portion of the fulcrum shaft 28 is directly supported by the stay 43 as described above, the fulcrum shaft 2
8 is in a state in which both ends are supported, and bending of the fulcrum shaft 28 itself due to the above-mentioned force applied to the main transmission lever 14 is also reduced. As a result, the error in the gear ratio of the HST 17 or the neutral position of the main shift lever 14 corresponding to the swing setting position of the main shift lever 14 becomes smaller, and the operation of the HST 17 by the main shift lever 14 becomes more accurate. Further, since the fulcrum shaft 28 and the stay 43 are attached by the nut 39 and the nut 41 that form a double nut for adjusting the braking force, it is not necessary to separately provide a component for attaching the stay 43 and the fulcrum shaft 28, which is cost effective. Is also advantageous.

[0022]

According to the present invention configured as described above, a force is applied to the swing fulcrum shaft of the main shift lever in a direction other than the swing (rotation) direction by the swing operation of the main shift lever. Also, the fulcrum shaft is supported on the hydraulic continuously variable transmission side by a stay in which the line of action of the force applied to the fulcrum shaft side at the time of swinging of the main shift lever is a triangular shape with the fulcrum shaft side as an apex when viewed from the front. Therefore, since the stay is not bent and the distance between the fulcrum shaft and the operating shaft of the hydraulic continuously variable transmission is small, the operating amount of the hydraulic continuously variable transmission with respect to the swing amount of the main transmission lever becomes accurate.

Further, in the structure in which the fulcrum shaft is directly attached to the stay by using a plurality of nuts for adjusting the operating load of the main speed change lever, the fulcrum shaft is directly supported by the stay, so that when the main speed change lever is swung, The deflection of the fulcrum shaft itself due to the force is reduced, and the operation of the hydraulic continuously variable transmission by the main transmission lever becomes more accurate. Further, it is not necessary to separately provide a component for attaching the fulcrum shaft and the stay, which is advantageous in cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a combine.

FIG. 2 is a perspective view of a driver's seat portion.

FIG. 3 is a front view of a main portion of a transmission portion.

FIG. 4 is a right side view of a main part of a transmission portion.

[Explanation of symbols]

 14 main speed change lever 17 hydraulic continuously variable transmission 26 stay 28 fulcrum shaft 33 main speed change rod (connector) 34 trunnion shaft (actuating shaft) 39 nut 41 nut 43 stay

Claims (2)

[Claims] 1. A hydraulic continuously variable transmission (17) for continuously changing the rotational driving force of an engine, wherein a main gearshift lever (14) for performing a gearshift operation of the hydraulic continuously variable transmission (17) is rocked. It is provided freely, and a connecting tool (33) is provided for connecting between the swinging fulcrum shaft (28) of the main speed change lever (14) and the operating shaft (34) of the hydraulic continuously variable transmission (17). In a structure in which the transmission (17) has a speed change ratio set steplessly according to the swing angle of the main transmission lever (14), both left and right sides of the hydraulic continuously variable transmission (17) and the fulcrum shaft ( 28) side, so that the line of action of the force applied to the fulcrum shaft (28) side from the main shift lever (14) forms a triangular shape with the fulcrum shaft (28) side as the apex in a front view. Horizontal position on the shaft (28) side and hydraulic continuously variable transmission (17)
Side left and right positions with two or more stays (26), (43)
The structure for supporting the speed change lever in a mobile agricultural machine that is connected and supported by. 2. A plurality of nuts (39), (41) for adjusting the tightening force of the connection portion of the fulcrum shaft (28) with the main transmission lever (14) side are screwed onto the fulcrum shaft (28). , The stay (4) by the nuts (39), (41)
3. The structure for supporting a speed change lever in a mobile agricultural machine according to claim 1, wherein 3) is directly attached to the fulcrum shaft (28).