JPH11159612A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an operation feeling, and to prevent deformation and damage of a continuously variable transmission by arranging a flexible means to allow relative displacement between the continuously variable transmission and a link mechanism or in the link mechanism or between the link mechanism and a shift lever, and arranging an elastic body to resist the relative displacement. SOLUTION: A flexible means to allow relative displacement in the operation transmitting direction of a shift lever 17 and a continuously variable transmission 12, is arranged between a bell crank 18B and a second and rod 18B in a link mechanism 18. An elastic body 20 to apply resistance to relative displacement of a first operation shaft 12E and the shift lever 17, a first adjusting means to adjust the interlocking positional relationship between the shift lever 17 and the first operation shaft 12E and a second adjusting means to adjust an axial directional position of a second shift fork 12J to a second operation shaft 12G, are provided. Therefore, an operation feeling of shift operation is improved, and a driving load by the continuously variable transmission can be absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine such as a rice transplanter in which a speed change lever is linked to a belt type continuously variable transmission via a link mechanism.

[0002]

2. Description of the Related Art Heretofore, a continuously variable transmission and a speed change lever have been linked via a link mechanism without play.

[0003]

However, in the case of the above-mentioned conventional technique, since the large operation resistance of the continuously variable transmission acts on the shift lever from the start of the operation of the shift lever, it is difficult to operate the shift lever. The feeling was bad.

In addition, when the drive load of the continuously variable transmission increases, the load can not be absorbed by the speed change because the continuously variable transmission is fixed by the shift lever, and the belt or the pulley cannot apply excessive force. Act may cause their deformation and breakage.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the operational feeling of a shift operation and to absorb a driving load by a continuously variable transmission.

[0006]

The features, functions and effects of the first aspect of the present invention are as follows.

[Features] A work machine in which a speed change lever is linked to a belt-type continuously variable transmission via a link mechanism, wherein the work is between the continuously variable transmission and the link mechanism, or during or in the link mechanism. A flexible means is provided between the continuously variable transmission and the speed change lever to allow relative displacement in the operation force transmission direction between the continuously variable transmission and the speed change lever, and an elasticity for imparting resistance to the relative displacement between the continuously variable transmission and the speed change lever. It has a body.

According to the first aspect of the present invention, when the shift lever is operated, the operating force of the shift lever is transmitted to the continuously variable transmission in a state where the elastic body is elastically deformed. The operation resistance is gradually increased by the elastic restoring force of the elastic body while the operation resistance of the elastic body is reduced by the elastic deformation of the elastic body, and the operation force of the shift lever is transmitted to the continuously variable transmission to change the continuously variable transmission to the shift lever. It can be operated in a state corresponding to the operation of.

In addition, since the continuously variable transmission is elastically deformed by elastically holding the continuously variable transmission via an elastic body in a predetermined operating state, the continuously variable transmission is allowed to perform a shift operation. When the driving load applied to the transmission increases, the load applied to the pulley, belt, etc., that is, the unreasonable force can be reduced by absorbing the load by permitting the operation of the continuously variable transmission due to the increased load. .

[Effects] According to the first aspect of the present invention, the uncomfortable feeling of the speed change operation is suppressed by applying the operation resistance in a state of gradually increasing the speed at the time of the speed change operation, instead of giving a large operation resistance from the beginning of the speed change operation. Operation feeling can be improved,
In addition, it is possible to prevent the continuously variable transmission from being deformed or damaged due to an increase in the driving load.

According to the second aspect of the present invention, the features, functions,
The effects are as follows.

[Features] In the features of the first invention,
The continuously variable transmission includes an input pulley and an output pulley, which are split pulleys that change a belt winding radius by moving a movable pulley body along a pulley axis relative to a fixed pulley body. A transmission belt is wound around the output shaft and the output pulley, and a first operating shaft linked to the link mechanism is movably attached to the fixed portion along the shaft center while being positioned parallel to the pulley shaft center.
An arm is mounted on the operation shaft in the axial direction positioning state and in a non-rotating state, and a second operation shaft parallel to the pulley shaft center is mounted on the arm in the axial direction positioning state, and the first operation shaft is moved in one direction. A first shift fork that moves integrally with the first operation shaft and moves one movable pulley body toward the belt winding radius increasing side along with the movement of the first operation shaft is rotatably mounted on the first operation shaft around its axis. A second shift fork, which moves together with the second operation shaft along with the movement of the first operation shaft in the opposite direction and moves the other movable pulley body to the side where the belt winding radius increases, is attached to the second operation shaft. The point is that a rotatable attachment is provided around the core.

According to the second aspect of the present invention, the first operation shaft movably mounted on the fixed portion along the axis is connected to the arm having the second operation shaft mounted in the axial position. Since it is mounted in the direction-positioning state and the rotation-stopping state, not only can the second operation shaft be moved along the axis with the first operation shaft, but also the first operation shaft with respect to the fixed portion of the second operation shaft can be moved. The position around the axis of the operation shaft can be fixed.

In addition, the first shift fork, which moves integrally with the first operation shaft and moves one of the movable pulleys toward the belt winding radius increasing side with the movement of the first operation shaft in one direction, is moved to the first shift fork. Attached to the operating shaft so that it can rotate around its axis,
A second shift fork, which moves integrally with the second operation shaft along with the movement of the first operation shaft in the opposite direction and moves the other movable pulley body to the side where the belt winding radius increases, is provided on the second operation shaft. Since the first shift fork and the second shift fork are swingably mounted around the first shift fork, fluctuation in the center distance between the input pulley and the output pulley caused by engine vibration and the like is allowed, and the first shift fork and the second shift fork are allowed to rotate. Engagement of the fork and the second shift fork with the movable pulley body can be reliably maintained.

[Effects] Therefore, according to the second aspect of the present invention, the second operation axis can be reliably positioned with respect to the first operation axis, and regardless of the fluctuation of the center distance between the input pulley and the output pulley. Synergistic with the fact that the first shift fork and the second shift fork can be reliably applied to the movable pulley body, the gear can be surely shifted regardless of engine vibration or the like.

According to the third aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the second invention,
A first adjusting means for adjusting an interlocking positional relationship between the shift lever and a first operating shaft; and a second adjusting means for adjusting an axial position of a second shift fork with respect to a second operating shaft. is there.

[Operation] According to the third aspect of the invention, the position of the shift lever and the first shift fork, that is, one of the positions, is adjusted by adjusting the interlocking positional relationship between the shift lever and the first operation shaft by the first adjusting means. The relationship with the belt winding radius of the input pulley or the output pulley provided with the movable pulley body can be adjusted, and the position of the second shift fork relative to the first operating shaft by the second adjusting means, ie, the axial position of the second shift fork. By adjusting the position of the second shift fork with respect to the first shift fork, the relationship between the belt winding radius of the input pulley and the output pulley can be adjusted. The shift lever and the input pulley can be adjusted so that, for example, the belt winding radius of the input pulley becomes the maximum setting value and the belt winding radius of the output pulley becomes the minimum setting value. It is possible to adjust the tripartite relationship between Li and the output pulley to a proper state.

[Effects] Therefore, according to the third aspect of the present invention, the continuously variable transmission can be operated in a shift state corresponding to the operation position of the shift lever regardless of manufacturing tolerances or assembly tolerances. became.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a riding type rice transplanter, which is an example of a working machine, has a seedling planting device via a link mechanism 2 and a hydraulic cylinder 3 at the rear of a riding type self-propelled body 1. 4 are connected so as to be able to move up and down freely.

The self-propelled body 1 is constructed by mounting an engine 8 and a boarding operation section 9 on a body frame 7 having a pair of left and right driving front wheels 5 for steering and a pair of right and left driving rear wheels 6. ing. The front drive wheel 5 is supported by the body frame 7 via a planting / running transmission case 10, and the rear drive wheel 6 is supported by the body frame 7 via an axle case 11. The engine 8 is supported on the body frame 7 including the transmission case 10 in a vibration-proof manner.

As shown in FIG. 2, power is transmitted from an output shaft 8a of the engine 8 to an input shaft 10a of the transmission case 10 via a belt-type continuously variable transmission 12. .

In the continuously variable transmission 12, as shown in FIG. 3, the input pulley 12A is mounted on the output shaft 8a in a non-rotating state, and the output pulley 12B is mounted on the input shaft 10a in a non-rotating state. A power transmission belt 12C is wound around a pulley 12A and an output pulley 12B.
It has a basic structure in which a tension pulley 12D for applying tension to 2C is provided. The input pulley 12A and the output pulley 12B are separated by changing the belt winding radius by moving the movable pulley body 12b along the pulley axis relative to the fixed pulley body 12a provided in a fixed position in the axial direction. It consists of pulleys. In other words, while the belt winding radius of the input pulley 12A is increased, while the belt winding radius of the output pulley 12B is reduced, the belt operates on the high-speed side to reduce the belt winding radius of the input pulley 12A. When the belt winding radius of the output pulley 12B is increased, the output pulley 12B operates on the low speed side. The fixed pulley body 12a and the movable pulley body 12b of the input pulley 12A are arranged so that the movable pulley body 12b is positioned on the engine 8 side (inside), and the fixed pulley body 12a of the output pulley 12B and the movable pulley body 12b. The body 12b is arranged in a state where the movable pulley body 12b is located outside.

As shown in FIG. 4, a first operating shaft 12E parallel to the pulley shaft is mounted on a steering gear case 13 which is an example of a fixed portion continuously provided above the transmission case 10 along the shaft. The arm 12F is attached to the first operation shaft 12E so as to be positioned in the axial direction and in a detented state.
A second operation shaft 12G, which is parallel to the pulley shaft center, is mounted in the axial direction positioning state and in a non-rotating state, and the first operation shaft 12E moves in one direction (outward) as the first operation shaft 12E moves in one direction (outward). To move the movable pulley body 12b of the input pulley 12A toward the belt winding radius increasing side against the belt tension, and with the movement of the first operating shaft 12E in the opposite direction (inward). The first shift fork 12H, which moves integrally with the first operation shaft 12E and allows the movable pulley body 12b to move toward the side where the belt winding radius decreases due to the belt tension, is rotatable about the axis of the first operation shaft 12E. Attach, a second integral with the first operating shaft 12E
As the operation shaft 12G moves in the opposite direction (inward), it moves together with the second operation shaft 12G to move the movable pulley body 12b of the output pulley 12B to the side where the belt winding radius increases and the second operation shaft. The second shift fork 12J moves integrally with the second operation shaft 12G along with the movement of the movable pulley 12G in one direction (outward) and allows the movable pulley body 12b to move to the side where the belt winding radius decreases due to the belt tension. The second
The continuously variable transmission 12 is constituted by being rotatably mounted on the operation shaft 12G around its axis. In other words, by moving the first operating shaft 12E and the second operating shaft 12G in one direction, the belt winding radius of the input pulley 12A is increased, while the belt winding radius of the output pulley 12B is reduced to operate at a higher speed. By moving the first operating shaft 12E and the second operating shaft 12G in the opposite directions, the belt winding radius of the input pulley 12A is reduced, while the belt winding radius of the output pulley 12B is increased to operate at a lower speed. It is supposed to. The means for stopping the rotation of the arm 12F with respect to the first operation shaft 12E is a means using a key 14.

The boarding operation section 9 includes a steering wheel 15, a driver seat 16, and a shift lever 17.

As shown in FIGS. 2 to 4, the shift lever 17 is linked to a first operating shaft 12E via a link mechanism 18 so as to operate the continuously variable transmission 12 in accordance with its swing. The detent mechanism 19 is configured to be able to hold positions at a plurality of operation positions in a state where human operation is allowed.

The link mechanism 18 is rotated by a first lever so as to swing about a left-right axis P1 with the swing of the shift lever 17.
A bell crank 18B interlocked with the shift lever 17 via the rod 18A is provided, and interlocked with the bell crank 18B via the second rod 18C so as to swing around the vertical axis P2 with the swing of the bell crank 18B. Linked axis 1
8D is provided at the upper end of the interlocking shaft 18D, and swings integrally with the interlocking shaft 18D while being engaged with the interlocking pin 12e attached to the first operation shaft 12E.
Is fixed, and the first operation shaft 12E is moved in one direction, that is, in the high-speed side with the swinging of the speed-change lever 17 to the high-speed side.
The first operation shaft 12E is moved in the opposite direction with the swing of the
That is, it is configured to move to the low speed side.

In the link mechanism 18, specifically, between the bell crank 18B and the second rod 18C, the transmission lever 17 and the continuously variable transmission 12, that is, the first transmission
Flexible means is provided to allow relative displacement of the operation shaft 12E in the operation force transmission direction, and an elastic body 20 for imparting resistance to the relative displacement between the first operation shaft 12E and the shift lever 17 is provided.
And first adjusting means for adjusting the interlocking positional relationship between the shift lever 17 and the first operating shaft 12E, and second adjusting means for adjusting the axial position of the second shift fork 12J with respect to the second operating shaft 12G. Is provided.

As shown in FIG. 5, the accommodating means includes a second
A cylindrical body 21 through which the rod 18C is slidably inserted in the longitudinal direction thereof is pivotally connected to the bell crank 18B, and a pair of stopper nuts 22 for restricting a sliding range of the second rod 18C with respect to the cylindrical body 21 is formed by a second. Rod 18C
And the stopper nut 22 is attached to the second rod 18.
C is provided so as to allow relative displacement between the transmission lever 17 and the continuously variable transmission 12 by relative sliding between the tubular body 21 and the second rod 18C, and Second rod 1 of stopper nut 22
The relative sliding range is changed by changing the fixed position with respect to 8C in the longitudinal direction of the second rod 18C.

As shown in detail in FIG. 5, the elastic body 20 has one stopper in a state where the second rod 18C is used as a spring guide and is compressed as the cylindrical body 21 moves toward the high speed side. A compression coil spring interposed between the nut 22 and one end surface of the cylindrical body 21. Similarly, the compression coil spring is compressed with the movement of the cylindrical body 21 to the low speed side with the second rod 18C serving as a spring guide. A compression coil spring interposed between the other stopper nut 22 and the other end surface of the cylindrical body 21 in a state where the compression coil spring 20 is in a predetermined state by adjusting the distance between the two stopper nuts 22. An initial compression force is applied, and the two stopper nuts are positioned so that the tubular body 21 is located at the center between the two stopper nuts 22 when the link mechanism 18 is stationary. In the 2 and the tubular member 21 is intended for applying a compressive force. The stopper nut 22 acts on the compression coil spring 20 via a seat 22a.

The first adjusting means, as shown in FIG.
The shift lever 17 is formed of the stopper nut 22 and the lock nut 23, and the shift lever 17 is moved to a predetermined position by changing the position of the stopper nut 22 in the longitudinal direction of the rod with respect to the second rod 18C while maintaining the distance between the stopper nuts 22. The position of the first operation shaft 12E at the position (for example, the highest speed position), that is, the belt winding radius of the input pulley 12A is adjusted.

As shown in FIGS. 3 and 4, the second adjusting means is screwed to the second operation shaft 12G and comes into contact with the second shift fork 12J from the outside, thereby being movable due to belt tension. An adjustment nut 24 for holding the position of the second shift fork 12J against the moving force of the pulley body 12b toward the belt winding radius decreasing side and a lock nut 25 for fixing the same are provided. By changing the position of the second shift fork 12 with respect to the second operation shaft 12G, the position of the second shift fork 12 with respect to the second operation shaft 12G is changed.
It is configured to change the axial position of J.

According to the above arrangement, the first adjusting means and the second adjusting means
By operating the adjusting means, the interlocking relationship between the shift lever 17 and the continuously variable transmission 12 can be adjusted. The adjustment procedure will be described. (1) The distance between both stopper nuts 22 from the end of the second rod 18C is set to a reference value. (2) The engine 8 is started, the shift lever 17 is operated to the highest speed position, and the engine 8 is stopped. (3) The belt winding radius of the input pulley 12A, that is,
The amount of ride (ride-out) of the outer peripheral surface of the power transmission belt 12C from the outer periphery of the input pulley 12A to the inside in the radial direction is measured. (4) If the ride-out is not the set value, the first adjusting means is operated to adjust the interlocking positional relationship between the shift lever 17 and the first operation shaft 12E, that is, the movable pulley body 12b of the input pulley 12A. (5) The above (2)-until the ride-out reaches the set value
Perform the operation of (4). (6) When the ride-out reaches the set value, the second adjusting means is operated to adjust the ride-out on the output pulley 12B side to the set value.

[Another Embodiment] In the above embodiment, the first
The movable pulley 12b of the input pulley 12A is operated by the shift fork 12H, and the movable pulley 12b of the output pulley 12B is operated by the second shift fork 12J. However, the movable pulley of the output pulley 12B is operated by the first shift fork 12H. By operating the body 12b, the movable pulley body 1 of the input pulley 12A is moved by the second shift fork 12J.
2b may be operated.

In the above embodiment, the continuously variable transmission 12 has a structure in which both the input pulley 12A and the output pulley 12B are split pulleys. One of the pulleys 12B may be a split pulley.

In the above-described embodiment, as the accommodating means, the one which permits the relative displacement between the transmission lever 17 and the continuously variable transmission 12 by the relative movement of the cylindrical body 21 and the second rod 18C in the longitudinal direction of the rod is shown. However, the accommodating means may include a long hole and a connecting pin movably engaged with the long hole.

In the above embodiment, the accommodating means is provided in the link mechanism 18. However, the accommodating means is provided between the speed change lever 17 and the link mechanism 18, or between the link mechanism 18 and the continuously variable transmission 1.
2 may be provided.

The structure and form of the link mechanism 18 can be changed as appropriate.

In the above embodiment, an example of application to a riding type rice transplanter has been described, but the present invention can be applied to various working machines such as tractors.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a side view of a continuously variable transmission and its operating device.

FIG. 3 is a cutaway rear view of the continuously variable transmission.

FIG. 4 is an exploded perspective view of the operation device.

FIG. 5 is a longitudinal sectional view of the accommodation means.

[Explanation of symbols]

 Reference Signs List 12 continuously variable transmission 12a fixed pulley body 12b movable pulley body 12A input pulley 12B output pulley 12C transmission belt 12E first operation shaft 12F arm 12G second operation shaft 12H first shift fork 12J second shift fork 13 fixed part 17 shift lever 18 Link mechanism 20 Elastic body

Claims (3)

[Claims] 1. A working machine in which a speed change lever is linked to a belt-type continuously variable transmission via a link mechanism, wherein the work machine is provided between the continuously variable transmission and a link mechanism, or in or between the link mechanism. An elastic body is provided between the transmission lever and a flexible means for allowing relative displacement of the continuously variable transmission and the transmission lever in the operation force transmission direction, and imparting resistance to the relative displacement between the continuously variable transmission and the transmission lever. A working machine provided with. 2. The continuously variable transmission includes an input pulley and an output pulley that are split pulleys that change a belt winding radius by moving a movable pulley along a pulley axis relative to a fixed pulley. A transmission belt is wound around the input pulley and the output pulley, and a first operating shaft linked to the link mechanism is movably attached to the fixed portion along the shaft center while being positioned parallel to the pulley shaft center. An arm is attached to the first operating shaft in the axial center position and in a non-rotating state, and a second operating shaft parallel to the pulley shaft is mounted to the arm in the axial center positioning state. The first shift fork, which moves integrally with the first operation shaft and moves one movable pulley body to the side where the belt winding radius is increased along with the movement in one direction, is moved to the first shift fork.
The operation shaft is rotatably mounted around its axis.
A second shift fork, which moves together with the second operation shaft along with the movement of the operation shaft in the opposite direction and moves the other movable pulley body to the side where the belt winding radius increases, is provided on the second operation shaft around the axis thereof. The working machine according to claim 1, further comprising a rotatably mounted device. 3. A first adjusting means for adjusting an interlocking positional relationship between the shift lever and a first operating shaft, and a second adjusting means for adjusting an axial position of a second shift fork with respect to a second operating shaft. The work machine according to claim 2, wherein the work machine is provided.