JPH0644849B2 - Gear change operation device in work vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gear shift operating device in a working vehicle such as a combine, and more specifically to operating a gear shift operating means of an infinitely variable transmission by an actuator and opening a main clutch. Regarding the device to be operated.

(B) Conventional technology Conventionally, a gear shift operating device in a working vehicle, such as a combine, operates an operation lever via a wire to a continuously variable transmission, and automatically and reversibly disconnects a main clutch when operated to a neutral position. When driving the vehicle in conjunction with each other, the main clutch is connected and the continuously variable transmission is accelerated by simply performing a tilting operation to put one operation lever into the forward movement range or the backward movement range. (See Japanese Utility Model Laid-Open No. 54-181421).

However, in the above-described shift operating device, since the plurality of wires must be pulled by the operation of one operating lever, the operating load becomes large and the operating feeling may be deteriorated.

Therefore, the applicant of the present invention installed one actuator in the vehicle and provided the actuator with a continuously variable transmission,
When the actuator operates based on the operation of the shift lever by interlocking the main clutch and the forward / reverse switching device,
A shift operation device has been proposed in which a forward / reverse switching device is used to switch between front / reverse and a main clutch is connected, and a continuously variable transmission is configured to operate at increased speed (Japanese Patent Application No. 61-231970). No.).

(C) Problems to be Solved by the Invention However, in the above-described speed change operation device proposed by the applicant, the speed change lever in the speed increasing position is moved toward the neutral position prior to the contraction operation of the actuator. When the tilting operation is performed, the gear shift lever is returned to the neutral position without waiting for the main clutch to be disengaged, and in order to eliminate the time lag, a spring is interposed in the interlocking path, and the forward / reverse switching device is also used. It has a slightly complicated mechanism and is suitable for use in a large-sized device, but it is difficult to apply it to a small combine in terms of space and cost.

In particular, if the forward / reverse switching device is configured to switch by moving laterally at the neutral position of the speed change lever, for example, when the speed change lever is operated from the forward position to the reverse position, the speed change operation of the continuously variable transmission is performed. I don't like it
As a result, the forward / reverse switching device is switched while the main clutch is in the connected state, resulting in damage such as damage to the gears.

(D) Means for Solving the Problems The present invention is intended to solve the above problems, and as shown in, for example, FIGS. 1 (a) and 1 (b), a drive side split pulley. 30 and a driven-side split pulley 21 having a continuously variable transmission 20 wound around a belt 42, and a shift operating means 36 is installed on one of the both side pulleys 21 and 30, and the shift operating means 36 is operated by an actuator 49. In the working vehicle 1 configured to operate and disengage the main clutch 37, a spring 35 for urging the gear shift operating means 36 in the deceleration direction is installed, and only the force of the actuator 49 in the acceleration direction is provided. Is provided to the gear shift operating means 36, and when the actuator 49 operates in the decelerating direction, the gear shift operating means 36 is released from the actuator 49, and the spring 35. It is characterized in that it is configured to be decelerated by the urging force of.

(E) Action Based on the above-described configuration, when the FR right gear shifting lever 11 is operated to increase the speed in the forward drive range F (or the reverse drive range R), the actuator 49 that extends by the operation is the main clutch 3
7 is connected, and the gear shift operating means 36 is operated in the speed increasing direction via the interlocking members 56 and 66, whereby the width of the drive side split pulley 30 is narrowed, and the belt 42 is pressed against the split pulley 30. The continuously variable transmission 20 is moved toward the outer periphery to control the speed increase. On the other hand, when the FR stepless speed change lever 11 is decelerated from its speed-up position toward the neutral position N, the actuator 49 causes the interlocking members 56 and 66 to cut off the transmission of force to the speed change operation means 36. Thus, the contraction operation is performed irrespective of the gear shift operation means 36, and the main clutch 37 is disengaged. Then, the gear shift operating means 36 released from the actuator 49 is actuated in the decelerating direction by the urging force of the spring 35, whereby the drive side split pulley 30 is widened and the belt 42 is moved inward. In order to move, the continuously variable transmission 20 is decelerated by changing its transmission ratio.

(F) Example Hereinafter, an example according to the present invention will be described with reference to the drawings.

As shown in FIG. 11, the combine 1 has a machine body 3 supported by crawlers 2, and the machine body 3 is provided with an automatic threshing device 6 having a feed chain 5 on one side thereof. ing. Further, a pretreatment unit 7 is installed in the front of the machine body 3 so as to be able to move up and down, and a narrow guide 9 is installed upside down on the side of the pretreatment unit 7. A driver's seat 10 is provided on the other side of the machine body 3 and
Operation panel 8 (7th
(See the figure), an FR continuously variable transmission lever 11 is swingably installed along a crank-shaped guide groove 8a.

On the other hand, a mission case 12 is mounted on the machine body 3, and the mission case 12 includes a traveling system auxiliary transmission unit 13, a traveling system forward / reverse switching transmission unit 14, a side clutch, as shown in FIG. A transmission 17 including a braking device 15 and a traveling drive unit 16 is provided.
Further, from the top of the mission case 12, the shaft 19
Has one end rotatably supported and protrudes, and the driven-side split pulley 2 constituting the continuously variable transmission 20 is protruded from the protrusion.
1 is installed, and the sprocket 22 is attached to the tip from the bottom.
The axle 23 in which is fixed is protruding. Further, as shown in FIG. 9, a counter case 26 accommodating the pretreatment transmission portion 25 is arranged above the mission case 12, and the counter case 26 further includes shafts 27, 2
9 is rotatably supported, and a drive side split pulley 30 and a transmission pulley 31 which constitute the continuously variable transmission 20 are arranged on the shafts 27 and 29, respectively. The drive-side split pulley 30 is composed of a fixed sheave 32 and a movable sheave 33. The movable sheave 33 has a boss portion 33a fitted to and fixed to the end of the shaft 27 of the fixed sheave 32. Part 32a
It is slidably fitted to and is biased by a spring 35 (see FIG. 1 (a)) in a direction away from the fixed sheave 32. Further, between the movable sheave 33 on the shaft 27 and the counter case 26, the sheave 3
A speed change cam 36 including a movable cam and a fixed cam 38 for moving the 3 as needed is installed.

As shown in FIG. 8, the driven side split pulley 21 includes a fixed sheave 39 fixed to a main clutch 37 installed on a shaft 19 and a movable sheave 40 slidably fitted to the shaft 19. Further, the movable sheave 40 is urged by a spring 41 in a direction of approaching the fixed sheave 39, and an endless belt 42 wound between the driven side split pulley 21 and the drive side split pulley 30 is pressure-contacted. is doing. Also, the main clutch 37 and the mission case 1
A clutch operating cam 46 composed of a fixed cam 43 and a movable cam 45 is installed between the movable cam 45 and the movable cam 45, and the movable cam 45 connects the main clutch 37 with a spring 44 (see FIG. 1 (a)). Is urged to

On the other hand, as shown in FIGS. 1 (a) and 1 (b), the counter case 2
6 is fixed to the mission case 12 with a large number of bolts via a connecting member 47, and one end of the connecting member 47 has one end of a continuously variable hydraulic actuator 49 composed of a double-acting cylinder rotated by a pin 50. It is movably supported. Further, two brackets 51, 51 are bolted above the counter case 26. A pipe 52 is penetrated and welded to the brackets 51, 51, and a pipe shaft 53 is attached to the pipe 52. A pipe 55 is rotatably fitted and a shaft 55 is rotatably fitted on the pipe shaft 53. Arms 56 and 57 are fixed to both ends of the pipe shaft 53, and a pipe rod 59 is rotatably supported at one end of the arm 56 by a pin 60. And the pipe rod 5
In the hollow portion 59a of 9, the movable cam 4 is provided with a pin 61 at one end.
5 is rotatably supported by the projection 45a of
The other end of the rod 62 whose length can be adjusted at 4 is slidably fitted. The other end of the hydraulic actuator 49 is pivotally supported by a pin 58 at the tip of the arm 57, and the actuator 49 is supported at both ends by the arm 57 and the connecting member 47, and the side surface 26 a of the counter case 26. It is held in a state substantially parallel to. Further, an arm 63 is fixed to one end of the shaft 55, and one end of the arm 63 is attached with one of ball joints 64, 64 provided at both ends of a rod 65 by a nut 66. The other is attached to the movable cam of the speed change cam 36. The arm 63 has the other end of the spring 35, one end of which is attached to the bracket 51, so that the arm 55 has the shaft 55 as a center.
(a) The movable cam 34 is urged to rotate in the clockwise direction, and the rotational force of the arm 63 is applied to the movable cam 34 via the rod 65.
It is configured to approach while rotating toward.
Therefore, when the movable cam 34 is returned toward the cam 38 from the state where the movable cam 34 is separated from the fixed cam 38,
Unlike the case where the spring 35 is simply pressed to move, the turning force in the direction of arrow A in FIG.
Since the movable cam 34 smoothly slides its cam surface 34a against the cam surface 38a of the fixed cam 38, the speed change cam 36 operates smoothly without causing troubles such as momentary separation of the cams 34, 38 due to vibration or the like. To be done. Further, when the arm 56 is rotated upward by the extension of the hydraulic actuator 49, the nut 66 is pressed in the same direction by the arm 56 and moves the movable cam 34 through the rod 65 in FIG. The movable cam 34 is rotated in the direction opposite to the arrow A, the movable cam 34 is separated from the fixed cam 38 to increase the speed of the continuously variable transmission 20, and the contraction of the hydraulic actuator 49 causes the arm 56 to rotate downward. At this time, the arm 56 releases the nut 66 by the rapid contraction of the actuator 49, and the nut 66 is rotated only by the urging force of the spring 35. Further, a potentiometer 67 (see FIG. 2) is installed on the extension axis of the pipe shaft 53, and the potentiometer 67 can detect the extension / contraction operation of the hydraulic actuator 49 via the arm 57, the pin 57a and the arm 64. Is configured. Also,
A belt 69 is wound between the transmission pulley 31 installed in the counter case 26 and the pulley 68 on the engine side, and the belt 69 is provided at the other end of an arm 70 whose one end is supported by the counter case 26. Tension pulley 7
1 is tensioned by being biased toward the case 12 by the spring 72. The numeral 73 in the figure is a nut.

On the other hand, the F / R continuously variable transmission lever 11 is arranged together with the auxiliary transmission lever 74 on the side operation panel 8 as shown in FIG. 5 and FIG. The support shaft 76 provided on the bracket 75 is swingable in the longitudinal direction of the machine body, and the pin 79 pivotally supported by the bracket 77 installed on the machine body 3 is swingable in the lateral direction of the machine body. Further, the continuously variable transmission lever 11 is provided with a blind brake 80 at its pivotal point, and can be positioned above the click stop 81 via a click stop 81, and slightly above the click stop 81 in the lateral direction of the machine body. The pin 82 projects from the arm 8
3 is rocked in the longitudinal direction of the machine body so that the tilt angles of the lever 11 in the forward movement region F and the backward movement region R (see FIG. 7) can be detected by the potentiometer 85. Also,
An arm 86 is fixed to the pin 79 so that one end of the arm 86 is pivoted in the vertical direction as the gearshift lever 11 swings in the lateral direction of the machine body, and a bracket 87 is attached to the other end of the arm 86. The rod 89 is connected via the.

Next, the hydraulic circuit will be described with reference to FIG.

The hydraulic pump P communicates with the pretreatment switching valve V1 and also communicates with the continuously variable solenoid valve V2 via the oil passage 90, and the pretreatment switching valve V1 further includes the pretreatment lift hydraulic pressure. An actuator 91 is connected, and a continuously variable hydraulic actuator 49 is connected to the continuously variable solenoid valve V2. Also,
A filter 9 is provided in the speed-increasing oil passage 95 of the actuator 49.
6 and the check valve 97 and the throttle 99 are provided. When increasing speed, pressure oil is pressed into the hydraulic actuator 49 via the throttle 99 to extend the actuator 49 relatively slowly, and at the time of deceleration, the check valve 97. The pressure oil is promptly discharged when the valve is opened to quickly contract the actuator 49. Further, the deceleration side oil passage 1
A filter 101 is provided at 00.

Since the present embodiment has the above-described structure, when the combine 1 is traveled, the F / R continuously variable transmission lever 11 is used.
Is tilted, for example, in the forward region F of the guide groove 8a, the bracket 75 is rotated about the pin 79 in the direction of arrow B in FIG. As a result, the arm 86 is rotated about the pin 79 in the direction of arrow C in FIG.
, The rod 89 is pressed downward, the forward / reverse switching lever 102 is rotated downward, and the traveling system forward / reverse switching transmission unit 1
Switch 4 to the forward side.

After that, the continuously variable transmission lever 11 moves from F1 to F9.
When it is tilted toward (see FIG. 7), the lever 1
The potentiometer 85 is rotated in accordance with the rotation of 1, and the tilt angle of the shift lever 11 is detected. As a result, the continuously variable solenoid valve V2 is operated, and the hydraulic pump P
Is sent to the speed-increasing oil passage 95 through the valve V2, and the pressure oil is press-fitted into the actuator 49 through the filter 96 and the throttle 99. Therefore, the continuously variable transmission hydraulic actuator 49 is extended upward in FIG. Then, the main clutch 37, in which the pipe rod 59 abuts against the upper end of the rod 62 and is disengaged when the actuator 49 is contracted, causes the actuator 49 to extend, whereby the main clutch 37 is piped via the arm 57, the pipe shaft 53 and the arm 56. Rod 59 is raised and rod 6
2 is released, which causes the movable cam 45 to move to the spring 4
It is rotated by the urging force of 4 and the main clutch 37 is connected. Further, as shown in FIG. 3, the pipe shaft 53 is rotated in the direction of D in FIG. 3 via the arm 57, which causes the arm 56 to rotate upward and press the nut 66 in the same direction. Therefore, the nut 66, that is, the arm 63 is rotated against the biasing force of the spring 35, the rod 65 is pulled upward, and the movable cam 34 of the speed change cam 36 is rotated in the direction E of FIG. The movable sheave 33 of the drive side split pulley 30 is moved toward the fixed sheave 32 by being separated from the fixed cam 38, and the endless belt 42 is pressed against the fixed sheave 32.
The continuously variable transmission 20 is increased in speed. When the expansion operation of the hydraulic actuator 49 is detected by the potentiometer 67, the actuator 49 causes the F / R continuously variable transmission lever 11 detected by the potentiometer 85.
Is stopped at the position corresponding to the tilting angle of. As a result, the combine 1 traveling forward is set to a speed corresponding to the continuously variable transmission lever 11.

When the FR stepless speed change lever 11 is returned from F9 to F1 in the forward range F, the potentiometer 85 is returned along with the movement of the lever 11, and the deceleration side oil passage of the hydraulic actuator 49 is correspondingly returned. When pressure oil is injected from 100, the check valve 97 of the speed increasing oil passage 95 is opened, the speed increasing oil in the actuator 49 is quickly discharged, and the actuator 49 is quickly contracted. As a result, the pipe shaft 53 is rotated in the direction of the arrow G in FIG. 4, and the arm 56 is rotated separately from the nut 66 to push down the pipe rod 59, and the upper end of the hollow portion 59a of the pipe rod 59. However, the main clutch 37 is disengaged by abutting the upper end of the rod 62 and pressing the rod 62. In parallel with this, the nut 66 released from the arm 56 pushes down the rod 65 by the arm 63 being pressed by the urging force of the spring 35, and elastically rotates the movable cam 34 of the shift cam 36. Move. At this time, the movable cam 34 moves the shaft 2 by the urging force of the spring 35.
7 and the drive side split pulley 30
When the endless belt 42 tries to move inward, the cam surface 34a of the movable cam 34 comes into close contact with the cam surface 38a of the fixed cam 38 because the endless belt 42 is pressed toward the fixed cam 38 via the movable sheave 33. The movable cam 34 and the fixed cam 38 are stably operated without being separated by vibration or the like. Further, since the speed change cam 36 is rotated and operated separately from the hydraulic actuator 49 that contracts rapidly, in the continuously variable transmission 20, the width of the drive side split pulley 30 is rapidly increased and the endless belt 42 is formed. The speed is reduced toward F1 without causing a problem such as temporary idling. Therefore, the operation of the continuously variable transmission 20 is accurately detected by the potentiometer 67, so that the continuously variable transmission 20 is properly operated in response to the tilting operation of the FR stepless transmission lever 11. Then, when the speed change lever 11 is returned from the forward movement range F to the neutral position N, the pin 79 is rotated together with the bracket 75 in the direction of the seventh arrow H, and the rod 86 is rotated in the direction of the arrow I to raise the rod 89. Therefore, the forward / reverse switching lever 102
Is rotated upward by a predetermined amount, so that the shifter is disengaged from the transmission gear of the traveling system forward / reverse switching transmission portion 14 to bring it into a neutral state. Even when the FR stepless speed change lever 11 is switched to the reverse range R to increase / decelerate from R1 to R9 or from R9 to R1, the hydraulic actuator 49, the speed change cam 36, and the continuously variable transmission 20 move in the forward speed range. It is operated in the same way when operating to F.

(G) Effect of the Invention As described above, according to the present invention, when the actuator 49 operates in the deceleration direction, the gear shift operation means 36 interrupts the force transmission from the actuator 49 by the interlocking members 56 and 66, Since the deceleration operation is performed by the urging force of the spring 35, the gear shift operation means 36 can be operated separately from the deceleration operation of the actuator 49, even though the structure is extremely simple, so that the actuator 4 can be operated.
9 so as to rapidly decelerate the main clutch 37
Can be quickly disconnected, and therefore, even if the FR stepless speed change lever 11 is swung to the neutral position N promptly, no trouble occurs. Further, the gear shift operating means 36 is smoothly operated to the deceleration side by the spring 35, so that the continuously variable transmission 20 can be decelerated stably and evenly, whereby the drive side and driven side split pulleys 30, A belt 42 wound between 21 reliably prevents a problem such as a failure to follow the change of the split pulley 30 (or 21), and can reliably correspond to the operation of the continuously variable transmission lever 11. It can be an operating device.

In addition, the speed change operation means 36 includes the movable cam 34 and the fixed cam 3.
When the movable cam 34 is constituted by 8 and is biased by the spring 35 in the direction perpendicular to the shaft 27 thereof, the movable cam 34 can slide smoothly in close contact with the fixed cam 38, and at the same time, the driving side can be driven. Since the movable sheave 33 of the split pulley 30 (or the driven-side split pulley 21) can be decelerated before moving in the deceleration direction, the movable cam 3
4 to prevent the cam surfaces 34a, 38a of the movable cam 34 and the fixed cam 38 from being separated from each other due to the weight, vibration, etc., of the continuously variable transmission 20. Therefore, the continuously variable transmission 20 can be made more reliable and can be controlled by the operator.

[Brief description of drawings]

FIG. 1 (a) is a side view showing a shift operating device according to the present invention,
FIG. 1 (b) is a front view thereof, FIGS. 2 to 4 are operation views of essential portions thereof, FIG. 5 is a side view showing an operating mechanism of an F / R continuously variable transmission lever, and FIG. 6 is a front view thereof. Fig. 7, Fig. 7 is a diagram showing the whole, Fig. 8 is a sectional view showing the entire mission case,
FIG. 9 is a sectional view showing the entire counter case, and FIG. 10 is a view showing a hydraulic circuit. FIG. 11 is a side view showing the whole combine. 1 ... Work vehicle (combin), 20 ... Continuously variable transmission, 21 ... Driven side split pulley, 30 ... Drive side split pulley, 34 ... Movable cam, 35 ... Spring, 36 ...
Gear change operation means (gear cam), 37 ... main clutch,
38: fixed cam, 42: belt (endless belt), 4
9 ... Actuator (hydraulic actuator for continuously variable transmission), 56, 66 ... Interlocking member (arm, nut).

Claims (2)

[Claims] 1. A continuously variable transmission comprising a drive-side split pulley and a driven-side split pulley wound around a belt, and a shift operating means is installed on one of the split pulleys, and the shift operating means is provided by an actuator. And a main clutch for engaging and disengaging the work clutch, wherein a spring for urging the speed change operating means in a deceleration direction is installed, and only the force in the speed increasing direction of the actuator is changed. A gear shift operation device for a working vehicle, wherein a gear shift operation means is released from the actuator when the actuator operates in a deceleration direction and is decelerated by the biasing force of the spring. 2. A shift operation for a work vehicle according to claim 1, wherein said shift operation means comprises a movable cam and a fixed cam, and said spring urges said movable cam in a direction perpendicular to its axis. apparatus.