JPH0483971A - Gear shifter for tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a speed change shifter for a tractor or the like.

(Prior Art and Problems to be Solved by the Invention) In a configuration in which a transmission gear is shifted by a transmission shifter, a shifter stay that guides the movement of the transmission shifter is movable along an axial direction with respect to a transmission case. A clip for locking the shifter stay at a predetermined shift position is provided on a case cover or the like that can be attached to and detached from the transmission case.

Such a configuration is inconvenient and complicated when the transmission gear is far away from the case cover or where it is difficult to attach the shifter stay to the case cover.

(Means for Solving the Problems) This invention provides an end portion of an input shaft 2 on the transmission input side that protrudes into a transmission case 1, and an output shaft 4 that transmits output from the input shaft 2 by a transmission gear 3. A speed change shifter 6 that shifts the speed change gear 3 by being slidably supported along the axial direction of the output shaft 4 on a partition wall 5 rotatably bearing an end thereof.
A shifter for a tractor or the like is provided with a shifter stay 7 and a clip 8 for locking the shift position of the shifter stay 7.

(Operations and Effects) When the shifter stay 7 is shifted, the shifter stay 7 is supported and guided by the partition wall 5 and guided to move within the transmission case 1 parallel to the input shaft 2, output shaft 4, etc. The transmission gear 3 is shifted by the shifter 6. The neutral position and each shift position are locked by a clip 8 provided on the partition wall 5 that supports the shifter stay 7.

2, the shifter stay 7 is supported by the partition wall 5 of the transmission case 1 and slidably guided in the axial direction.
The shifter stay 7 can be supported and guided only by the partition wall 5, without causing one end of the shifter stay 7 to protrude outside the transmission case. , can be simplified.

(Example) In the examples shown in Figs. 1 to 4, the power take-off shaft of a tractor is used as the output shaft 4, and this output shaft 4 and the An input shaft 2 for transmitting power is mounted on a shaft extending in the front-rear direction. The tractor body has an engine connected to the front, a transmission case 11 connected to the rear via a clutch housing 10, and a transmission case 1 further connected to the rear. A rear axle housing on which a rear wheel 9 is mounted is provided on both left and right sides of the transmission case 1. In addition, a hydraulic case 12 having a J-lift cylinder is detachably provided on the upper side, and a lift arm for lifting and lowering work machine connecting links such as a lower link and a top link connected to the rear side of the transmission case 1 can be moved up and down. It is set up freely.

The transmission case 1 has a pinion gear 14 at the rear end of the transmission shaft 13 that transmits power through the clutch device of the clutch housing 10, and meshes with the differential link gear 16 of the differential shaft 15 for transmission. A transmission shaft 17 is provided, and parallel to this transmission shaft 17 are an input shaft 2 for power extraction transmission, a front axle extraction shaft 18 for transmitting power to the front wheels, and a counter gear 19.2.
0 etc. is set. Among these, the input shaft 2 extends rearwardly through the transmission case 1, has a rear end bearing on a partition wall 5, and transmits variable speed transmission to the output shaft 4 via a speed change gear 3.

The transmission shaft 13 is interlocked with the front end of the input shaft 2 via the gear 21, and by switching the transmission gear 22 at the front of the input shaft 2, the transmission is transmitted between the transmission shaft 13 and the counter gear 23 at the front of the transmission shaft 17. The configuration is such that gear changes are linked. 24 is a counter gear for reverse movement. Further, a sub-transmission gear 25 is provided at the rear of the transmission shaft 17, and is interposed between the rear end of the counter gear 23 and a counter gear 26 on the counter shaft 20 to perform sub-transmission transmission. Further, a gear 27 is provided at the rear end of the transmission shaft 17, and the gear 27 is rotatable with respect to the input shaft 2.
The input shaft 2 is interlocked with the clutch gear 29 on the front axle take-out shaft 18 via the gear 2, and can be interlocked with the front axle take-out shaft 18 through engagement of the clutch gear 29.
A counter shaft 30 is connected to the rear end of the input shaft 2, which is transmitted by the input shaft 2, and an output shaft 4 parallel to these shafts 2.30.
The speed change gear 3 is spline-fitted onto the top and is movably operated by the speed change shifter 6. The speed change gear 3 is connected to the first speed gear F1 on the output shaft 4 which is always in mesh with the gear 31 on the counter shaft 30. When engaged, the speed becomes low, and the double gear F
When it is engaged with gear F3, it becomes a medium speed, and when it is engaged with third gear F3, it becomes a gear change and is interlocked.

The front ends of the counter shaft 30 and the output shaft 4 are supported by the partition wall 5, and the rear ends are supported by the rear wall 32. This partition wall 5 is located in the center of the transmission case 1, at the rear side of the differential gear mechanism between the left and right differential shafts 15, and is erected upward from the lower part, and the upper end is free. It's just at the end.

The left and right sides may be connected to the side wall portions of the transmission case 1, but at least one side extends outward beyond the gear diameters of the series gear F1 and the transmission gear 3, and is connected to the shifter stay 7 of the transmission shifter 6. The structure is such that it can be slidably supported.

This partition wall 5 is provided with a guide hole 33 into which the shifter stay 7 is inserted, and a clip hole 34 in a direction perpendicular to this guide hole 33 is provided, and a spring 35 and a clip ball 36 are inserted into this clip hole 34. A hanging clip 8 is formed by fitting into the clip groove 37 of the shifter stay 7 inserted into the guide hole 33 and locking each shift position of the shifter stay 7. This shifter stay 7 has a transmission shifter 6 provided on the rear side of the partition wall 5 to engage the transmission gear 3, and a transmission case l is provided at the front end on the opposite side from the transmission shifter 6. Operation shaft 3 rotatably supported on the side wall
The distal end of a shift arm 39 that swings around 8 is engaged, and by actuating this operating shaft 38 with a shift lever 40, the shifter stay 7 is moved in the direction of the guide hole 33 against the clip 8, thereby shifting gears. Shift gear 3.

The rear end of the output shaft 4 is made to protrude rearward from the rear wall 32 of the transmission case 1, and is connected to an interlocking shaft via a universal joint, an expansion joint, etc. so as to be interlocked with a working machine.

Further, the upper hydraulic case 12 is provided with a lift arm 41 that is movable up and down for raising and lowering the working machine.
Operated by hydraulic cylinder.

42 is a control valve that controls the hydraulic cylinder.

43 is a rear wheel fender that covers the rear wheel 9. Reference numeral 44 denotes a rear axle supported within a rear axle housing 45, which receives power from the differential shaft 15 and supports the rear wheels 9 thereon.

5 to 7 show a pair of left and right lower links 46 and a top link 47 on the rear side of the transmission case 1, which is the tractor body.
This figure shows a tilling machine connected by a tiller, etc., in which a gear transmission 48 is provided in a tiller transmission case 54 to interlock a tiller shaft 50 on which a lower tiller claw 49 is disposed. A transmission case 52 bearing a tillage input shaft 51 is provided in front of the tillage transmission case 47 with a transmission cover 53 interposed therebetween, and the tillage input shaft 51 and the output shaft 4 are interlocked by an interlocking shaft. It is the composition.

At the upper end of the tillage transmission case 54, a transmission lid 53 is fixed to the front opening so that it can be rotated around a binion shaft 55 in the center and rotated by an appropriate angle A with a bolt 56. Further, the front side of the transmission lid 53 is provided so as to bear the tilling input shaft 51 and to be always in a meshing and interlocking state with the binion shaft 55 through the meshing of a gear 57. It can be rotated and rotated A around the pinion shaft 55 to change the vertical position. When the tiller power shaft 51 is rotated in conjunction, the binion shaft 55 is rotated, and the transmission shaft 58 is further transmitted, and the lower tiller shaft 50 is rotated and interlocked through a chain transmission mechanism or the like. 5
9 is a tilling cover that covers the rotation of the tilling claw 49, and 60 is a cover that hangs down from the rear end of the tilling cover.

When the position of the transmission case 52 is rotated relative to the tillage transmission case 54 and the tilling input shaft 51 is placed in a higher position, it is suitable for lowering the tilling device to a lower position and transmitting tillage. When set to a lower position, it is suitable for relatively high-level tilling work, such as when cultivating with a tilling device positioned on a ridge.

In this way, the position of the tilling input shaft 51 can be moved up and down according to the height of the tilling work machine with respect to the vehicle body, and the power transmission by the interlocking shaft between the output shaft 4 and the tilling input shaft 51 can be maintained smoothly.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side sectional view of a part, Fig. 2 is a front view of a part thereof, Fig. 3 is a side sectional view of a tractor transmission device, and Fig. 4 is a sectional side view of a part thereof. 5 is a side view of the tilling machine, FIG. 6 is a side sectional view of a part thereof, and FIG. 7 is a front view thereof. (Explanation of symbols) 1 Transmission case 3 Speed gear 5 Partition wall 7 Shifter stay 2 Human power shaft 4 Output shaft 6 Speed shifter 8 Clip

Claims (1)

[Claims] An intermediate partition wall 5 that protrudes into the transmission case 1 and rotatably bears the end of the input shaft 2 on the transmission input side and the end of the output shaft 4 to which output is transmitted from the input shaft 2 by the transmission gear 3. A shifter stay 7 of the speed change shifter 6 that is slidably supported along the axial direction of the output shaft 4 to shift the speed change gear 3, and a clip 8 that locks the shift position of the shifter stay 7 are provided. Gear shifter for tractors, etc.