JP3376654B2 - Transmission operating devices for agricultural work vehicles, etc. - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change operation device for an agricultural work vehicle or the like, and relates to a planetary gear mechanism and a continuously variable transmission belt for a combine, a tractor, a seedling planter, a transport vehicle and the like. It can be used for a traveling transmission device configured by combining the above. 2. Description of the Related Art In a traveling operation of an agricultural work vehicle or the like, a continuously variable transmission is used to facilitate a shift operation and a reverse operation, and a single shift lever is used. In many cases, these continuously variable transmissions have a simple structure and a planetary gear transmission system with a high transmission efficiency. Transmission mechanisms combining a step-variable belt transmission system have been used. However, since this continuously variable transmission is constituted by a speed change belt and a split pulley, in order to surely stop the speed change belt at the neutral position, the position of an input clutch for transmitting power to the continuously variable transmission is detected. Although the switch is turned off by the action of a switch or the like, this switch is normally turned off when the neutral position is detected by engaging with the shift operation of the shift lever. When the speed change lever is operated, the input clutch is disengaged and the speed change belt is stopped, so that the speed change operation load of the speed change lever is heavy, and a heavy burden is imposed on the operator. Accordingly, the present invention is to provide a manual switch for manually engaging the input clutch at the grip of the shift lever in parallel with the position detection switch for detecting the neutral position. Also, shift the gear lever to the neutral position.
Before operating in the forward or reverse direction from
The input clutch that transmits power to the device is in the engaged state.
It is. According to the present invention, there is provided a continuously variable transmission belt system B which is transmitted from an input shaft 1 by a planetary gear transmission system A and a continuously variable transmission belt transmission system B, and is driven by a transmission lever 32. The output traveling shaft 7 from the neutral N to the normal rotation F
And an input clutch 6 for turning on / off the transmission from the engine E to the input shaft 1 of the transmission case 8 in an agricultural work vehicle or the like having a transmission case 8 that continuously changes the speed to the reverse rotation R.
5, a manual switch 66 for manually turning on and off the input clutch 65 is provided on the grip portion 32a of the shift lever 32, and the neutral N of the continuously variable transmission belt transmission system B is controlled by the shift operation of the shift lever 32. position Upon detection to the off input clutch 65 Ru provided the position detection switch 67 to enter the non-detecting, the shift
A protrusion 76a is provided in the sliding groove 76 of the lever 32,
The position detection switch 67 is provided on the protrusion 76a,
When the transmission lever 32 is positioned at the output portion 76a, the input clutch
Switch 65, and the shift lever 32
Is disengaged, the input clutch 65 is engaged.
So that the speed lever 32 is shifted forward or backward.
A shift operation device for an agricultural work vehicle or the like, characterized in that it is constituted. The transmission case 8 is provided with a planetary gear transmission system A and a continuously variable transmission belt transmission system B provided between the input shaft 1 and the output traveling shaft 7 in the transmission case 8. The configuration is simple, compact and lightweight. In addition, for a constant rotation of the planetary gear transmission system A, the continuously variable belt transmission system B
, The rotation of the traveling output shaft 7 can be continuously changed continuously from neutral N to forward F side high speed, reverse R side high speed, etc., by a single operation lever 32. The reverse change and the continuously variable transmission can be easily performed. When the continuously variable transmission belt transmission system B is set at the neutral N position, the input clutch 65 is disengaged by detecting the neutral N position by the position detection switch 67, and the continuously variable transmission belt transmission system B is detected. The operation of is stopped reliably, and then, at the time of running start, etc., first,
The stopped continuously variable transmission belt transmission system B is turned on by a manual switch 66 provided on the grip portion 32a of the transmission lever 32.
Then, when the input clutch 65 is actuated, the shift operation load of the shift lever 32 can be reduced. It should be noted that once the gearshift operation is performed, the manual switch 6
Even when the switch 6 is turned off, the input clutch 65 continues to be engaged due to the non-detection of the neutral N position of the position detection switch 67. As described above, since the position detection switch 67 for detecting the neutral N position and stopping the continuously variable transmission belt transmission system B at the time of the shift operation is provided, the shift operation of the shift lever 32 is performed when the vehicle starts running. The operation of the continuously variable transmission belt transmission system B before the shift operation of the shift lever 32 by turning on the manual switch 66 changes the shift lever
, And the operation feeling can be improved. In particular, the sliding groove 76 of the transmission lever 32
Is provided with a projection 76a, and a gearshift lever is provided from the projection 76a.
-32 is disengaged, the input clutch 65 is engaged, and the
Thereafter, the shift lever 32 is shifted forward or backward.
So that the shift lever 32 is moved forward or backward.
In the stage before shifting gears in the forward direction,
The latch 65 is in the on state, so that the continuously variable speed
Operation of the shift lever 32 for operating the pulley of the belt transmission system B
Work load is reduced. Also, the shift lever 32
Is operated, does the output traveling shaft 7 continuously change the speed?
Then, make sure that the shift lever 32 is in the neutral position.
It is difficult for the trader to recognize compared to the stepped transmission system
However, such a problem is also solved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, the present invention will be described with respect to a combine for harvesting cereals. The traveling transmission case 8 of the combine has a split shape in the left-right axis direction, in which the input shaft 1 and the transmission shaft 4 are supported at the upper part and the intermediate shaft 1 is provided at the lower part.
5, a steering clutch shaft 6, and left and right running shafts 7 are supported. One end of the input shaft 1 and the transmission shaft 4 is a pulley shaft portion 1B, 4B, and a belt case 16 is provided so as to be openable and closable, and a continuously variable transmission belt 13 and a split mold for extending the belt. The shift pulleys 11 and 12 are accommodated. At the outer end of the input shaft 1, there is provided a pulley 17 transmitted from the engine E by a belt 39 and a power take-out pulley 18 for transmitting a belt to a reaper.
The drive gear 9 is provided in the gear 19. In the belt case 16 of the input shaft 1, a pulley shaft portion 1B is detachably connected by spline fitting, and has a split pulley 11. The transmission shaft 4 includes a ring gear 10 which is rotatably engaged with the drive gear 9 in a gear case 19, a carrier 14 of a planetary gear 20 which meshes with the inside of the ring gear 10, and The shaft 14 of the carrier 14 and the planetary gear 20
A planetary gear mechanism 2 including a transmission gear 22 and the like which are integrally rotated via the shaft 1 is mounted on the shaft, and a pulley shaft portion 4B detachably mounted on the belt case 16 by spline fitting to the transmission shaft 4. And a split pulley 12 is provided. The split shaft of the pulley shafts 1B and 4B
The pulleys 11 and 12 are configured such that the split pulley spacing in each axial direction, that is, the pulley diameter can be changed, and the transmission by the belt 13 wound around these can be shifted. The speed-change shaft 4 is shifted by the continuously variable transmission belt 13. The sun gear 3 rotates integrally and the planetary gear mechanism 2 is rotatably provided. In a gear case 19, a clutch shaft gear 24 can be interlockedly rotated on the steering clutch shaft 6 via an intermediate gear 23 on an intermediate shaft 15 meshed with the transmission gear 22. The steering clutch 5 is turned on and off on both left and right sides of the clutch shaft gear 24 by the shifter arm 25, and this operation is performed by the push cylinder 60 engaged with the left and right shifter arm shafts 59 protruding outside the gear case 19. To act. Further, the left and right traveling shafts 7 are transmitted via a wheel gear 26 meshing with the gear portion of the steering clutch 5. To change the speed of the continuously variable transmission belt 12, the arms 27 and 28 having the cams 37 and 38 for moving the pulleys 11 and 12 in the axial direction are connected by a rod 29. The arm 28 is interlocked with a bell crankshaft 31 rotatably supported on the transmission case 8 via a rod 30 having a universal joint, and is connected by rotating the shift lever 32 in the front-rear direction. The structure is such that a stepless speed change operation can be performed via a spring 33, an interlocking arm 34, a rod 35 and the like. 6
Reference numerals 2 and 63 denote cam rollers rotatable at fixed positions for sliding the cams 37 and 38. The traveling power is transmitted by driving the input shaft 1.
While changing the speed of the pulleys 11 and 12 by the speed change lever 32, the rotation speed of the sun gear 3 is changed with respect to the ring gear 10 having a constant rotation, so that the rotation speed is changed from the neutral N to the normal rotation F high speed range, and conversely, the reverse rotation R When the steering clutch 5 is engaged, the planetary gear mechanism can be shifted from the traveling shaft 7 side to the reverse drive or the engine brake as in a downhill. 2 is reversely driven, so that even if the planetary gear 20 revolves around the carrier 14, the ring gear 10 that does not idle via the input shaft 1, the continuously variable transmission belt 13, the transmission shaft 4, and the like. And sun gear 3
And the revolution is regulated, the internal braking is performed, and the reverse drive is braked. In particular, when the input clutch 65 to the input pulley 17 by the belt 39 is disengaged and the input shaft 1 is not driven,
Since the continuously variable transmission belt 13 is not rotated, the carrier 14
Is not driven even if the sun gear 3 side is driven in reverse. Reference numeral 36 denotes a gear case 19 and a belt case 16
Between the input shaft 1 and the transmission shaft 4. In the combine having such a traveling transmission, a crawler 44 is bridged between a sprocket 41 driven by the pair of left and right traveling shafts 7, an intermediate rolling wheel 42, and an end rolling wheel 43. The transmission case 8 is provided at the front of a chassis 45 having a pair of left and right rollers 44. The tension of the belt 39 and the input clutch 65 from the engine pulley 61 of the engine E mounted below the lateral cockpit 46 is provided. Input pulley 1 via pulley 40
7 can be transmitted. The gearshift lever 32 for shifting the continuously variable transmission belt 13 has a grip switch 32a at the upper end thereof which has a manual switch 66 for switching the input clutch 65 on and off, and a manually operable switch 66. A lever 68, a lever 68, and a connecting spring 33 for buffering the lever arm 70 and the interlocking arm 34 while maintaining a fixed relational position.
The gear shift lever is provided by the brake by the friction brake 71.
It is possible to perform the forward / backward rotation operation while preventing the wobble of 32. By this rotation operation in the front-rear direction, the continuously variable speed can be continuously changed at a high speed in the forward direction as the operation is performed from the neutral N position to the forward rotation F position, and the reverse speed can be continuously changed as the operation is performed in the reverse R position. At the neutral position of the speed change lever 32, the contact 6 of the position detection switch 67 attached to the bracket 68 is attached to the cut-out portion 70a provided on the lever plate 70.
7a contacts and turns off, and the tension pulley 40 supported by the tension arm 72 is released by this turning off the transmission belt 39 by the return force of the return spring 75 via the rod 74 due to the non-operation of the clutch motor 73. An input clutch 65 for turning off the power transmission from the engine pulley 61 to the input pulley 17 is formed, and the manual switch 66 is connected in parallel to an electric circuit of a position detection switch 67 for controlling the clutch motor 73. In the neutral N position, the position detection switch 67
Is OFF and the input clutch 65 is disengaged, the shift operation load of the shift lever 32 at the time of start of traveling or the like becomes heavy. In this case, the manual switch 66 is turned ON before the shift operation of the shift lever 32 is performed. By operating the transmission belt 39 with the input clutch 65 engaged, the shift operation load can be reduced. After the vehicle starts traveling, the position detection switch 67
Is ON, the input clutch 65 continues to be engaged even if the manual switch 66 is turned OFF. The steering table 47 is provided with a power telescoping 48, and the left and right tilts of the power telescoping 48 cause the steering clutch 5 and the steering brake to be actuated by the shifter arm 25 for steering. The device 49 is configured to be able to be moved up and down. The reaping device 49 has a reaping frame 50 including a cutting blade device 51, a grain stalk raising device 52, a grain stalk raking device 53, a transport device 54 for transporting the stalked grain culm, and the like.
A support shaft 55 at the rear end of the frame 50 is rotatably fitted up and down on a cutting support metal 56 on the transmission case 8, and a hydraulic pressure provided between the chassis 45 and the cutting frame 50 is provided. The lifting and lowering control of the mowing device 49 is performed by the cylinder 64. A threshing device 58 is mounted at the rear of the undercarriage 45 for threshing the culm transported by the transport device 54 while nipping it between the feed chain 57 and the clamping rod and transporting it backward. . 7, unlike the above example, the contact 67a of the position detection switch 67 is not brought into contact with the cut-off portion 70a provided on the lever plate 70 of the transmission lever 32 to be turned off. Sliding groove 7
6 is provided with a protruding portion 76a, and the shift lever 32 is engaged with the protruding portion 76a.
Is turned off, the input clutch 65 is disengaged and the transmission belt 39 can be stopped, and when performing a shift operation from the neutral N position, as in the above example, the shift lever 32 of the shift lever 32 can be provided without providing the manual switch 66 separately. The position detection switch 67 is automatically turned on by the operation and the input clutch 6 is turned on.
5, the transmission belt 39 may be operated to reduce the shift operation load. FIG. 8 shows another embodiment. On the input shaft 78 of the transmission case 77, an interlocking dual input clutch 79 that disengages one clutch and simultaneously engages the other clutch is stopped, and the dual input clutch 79 is moved to the input gear A79a side. Connect this input gear A
HST input shaft 8 from HST 79a via HST input gear 80
The HST input shaft 81 drives the HST device 82 which continuously changes the speed by hydraulic drive by the HST input shaft 81, and outputs the HST output clutch 83 from the output side of the HST device 82.
Power is transmitted to the counter shaft 84 via the. In addition to the transmission by the HST device 82, the HST output clutch 83 is connected to the dual input clutch 79 in a state of being connected to the input gear B 79b.
From the input gear B79b to the low-speed gear 85.
In this case, two types of input transmission are performed as in the case of a mechanically-directed transmission that transmits power to the counter shaft 84 via the. For these two systems of input transmission, the HST transmission side is always used, and only when necessary, the mechanically-directed transmission side is used. By this input transmission, the high-speed gear 86 of the counter shaft 84 or the low-speed gear 8
5 and two shift gears of the shift shaft 87 are splined by meshing with each other, thereby shifting the gears into two stages of high and low, and transmitting the shifted power from the transmission gear 89 to the center gear 91 of the steering clutch shaft 90. When the left and right steering clutches 92 are engaged with the center gear 91, power is transmitted to the left and right steering clutches 92. The center gear 91 of the steering clutch shaft 90
In response to the transmission by the steering clutch shaft transmission system C, which transmits power to the left and right steering clutches 92, the differential clutch 93 of the transmission shaft 87 is engaged, and from the differential clutch gear 93 a via the brake gear 95 of the brake shaft 94, Differential device 96
The power is transmitted to the differential case gear 96a to drive the differential case 96b, and the left and right steering is performed via the left and right differential drive gears 98 fixed to the left and right differential shafts 97 from the differential gear 96c provided in the differential case 96b. Two types of transmission are performed by a steering clutch gear transmission system D that transmits power to the large clutch gear 92a of the clutch 92. The brake shaft 94 is provided with a differential transmission brake 99 for decelerating the differential device 96, and the left and right differential shafts 97 are provided with left and right differential control brakes 100, respectively. The actuator of the differential clutch 93 and the actuator of the differential transmission brake 99 are connected to the control valve of the power steering lever 48 by a hydraulic circuit, and the operating pressure is adjusted by the tilting operation angle of the power steering lever 48. Power is transmitted from the small clutch gear 92b of the left and right steering clutches 92 to the left and right traveling shafts 102 via the left and right traveling gears 101. In the above-described power transmission configuration, the differential device 96 can switch between three types of modes, that is, pivoting, spinning, and differential turning (or differential running) as shown in FIG. First, when the differential clutch 93 and the left and right differential control brakes 100 are each disengaged, for example, when the left (turn inside) steering clutch 92 is disengaged, the right (turn outside) steering clutch 92 is driven. The right differential shaft 97 and the right (turn outside) crawler 4
The differential device 96 is actuated by the left differential shaft 97 operated by the left steering clutch 92 which is dragged and acted by the turning force of No. 4 to rotate the differential case 96b. When the braking force is weakened by operating the power steering lever 48 to control the differential transmission brake 99, when the braking force is weak, the left (inward turning) crawler 44 is braked to perform pivoting. When the braking force is increased, the left crawler 44 can be rotated in the reverse direction with respect to the right crawler 44 to perform spin rotation. Next, with the differential speed change brake 99 and the left and right steering clutches 92 disengaged, the rotation of the differential case 96b caused by the engagement of the differential clutch 93 is performed by operating the power steering lever 48. At the same time as being adjusted by controlling the crimping driving force, for example, the left differential shaft 9 is actuated by the left (turn inside) differential control brake 100.
7, the differential device 96 can be made to make a differential rotation in the same manner as a differential operation of an automobile or the like, and the differential rotation can be performed by rotating the left and right crawlers 44 with different rotations. By using the 96, it is possible to set the traveling speed during normal traveling to, for example, 30 to 40 km / h.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a combine. FIG. 2 is a plan view of the combine. FIG. 3 is a side view of a transmission lever. FIG. 4 is an operation diagram relating to an input clutch. FIG. 5 is a front view of a mission case. FIG. 6 is a side view of a transmission case. FIG. 7 is a plan view of a transmission lever. FIG. 8 is a schematic front view of a mission case according to another embodiment. FIG. 9 is a matrix diagram of each turning action. [Description of Signs] 1 Input shaft 7 Running shaft 8 Transmission case 32 Shift lever 32a Handle 65 Input clutch 66 Manual switch 67 Position detection switch 76 Sliding groove 76a Projection A Planetary gear transmission system B Continuously variable transmission belt transmission System E Engine F Forward rotation N Neutral R Reverse rotation

Claims (1)

(57) [Claim 1] The transmission of the continuously variable transmission belt B by the transmission lever 32 is transmitted from the input shaft 1 by the planetary gear transmission system A and the continuously variable transmission belt transmission system B. In an agricultural work vehicle or the like having a transmission case 8 for continuously changing the output traveling shaft 7 from neutral N to forward rotation F and reverse rotation R by an operation, an input for turning on / off transmission from the engine E to the input shaft 1 of the transmission case 8. The clutch 65 is disposed, and the shift lever 3
The input clutch 6 is manually operated on the second grip portion 32a.
5 and a manual switch 66 for turning on and off
Upon detecting the neutral N position of the continuously variable belt transmission system B by the shift operation of the speed change lever 32 and turn off the input clutch 65 Ru provided <br/> the position detecting switch 67 to enter the non-detection, In the sliding groove 76 of the shift lever 32
A protrusion 76a is provided, and the position detection switch is provided on the protrusion 76a.
The shift lever 32 is provided on the protrusion 76a.
Is located, the input clutch 65 is disengaged, and the protrusion
When the shift lever 32 is disengaged from 76a, the input clutch 6
5 and then shift lever 32 forward or backward
Characterized in that it is configured to perform a speed change operation in a direction.
Transmission operation devices for work vehicles and the like .