JPH07232570A - Pto clutch of tractor - Google Patents

Abstract

PURPOSE:To simplify a transmitting mechanism of a PTO shaft and realize the option through the outer fitting of a PTO clutch of a tractor. CONSTITUTION:In a PTO clutch of a tractor, a PTO transmission 4 to make transmission between a transmission shaft 2 and a PTO shaft 3 is provided at the rear part of a final transmission case 1, and a clutch case 6 where a PTO clutch 5 of the wet multiple disc mode provided on the extension part of the transmission shaft 2 is internally fitted is installed on the rear end surface of this final transmission case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PTO clutch for a tractor, in which a clutch case containing a wet multi-plate type PTO clutch is attached to the rear end surface of a transmission case, and the structure is simplified.

[0002]

2. Description of the Related Art PTO from the final mission case of a tractor to the rear
In the transmission configuration in which the shaft is projected and transmitted to the working machine or the like, since the transmission for the PTO shaft, the PTO clutch, etc. are provided in the final mission case, the final mission case is long. Become
It becomes large and the structure of the internal transmission mechanism tends to be complicated.
In particular, when the wet multi-plate configuration is used as the PTO clutch, a complicated and large capacity space is required.

[0003]

According to the present invention, a PTO transmission 4 for transmitting a speed change between a transmission shaft 2 and a PTO shaft 3 is provided at a rear portion of a final mission case 1, and a final transmission case 1 of this final mission case 1 is provided. A tractor PTO in which a clutch case 6 in which a wet multi-plate type PTO clutch 5 provided in an extension of the transmission shaft 2 is installed is attached to a rear end surface.
Use the clutch structure.

[0004]

[Operation and Effect of the Invention] The transmission of the PTO shaft 3 is performed from the rear end portion of the transmission shaft 2 in the final transmission case 1 to the P position.
After passing through the TO clutch 5, this final mission case
It reaches the PTO transmission 4 in the space 1, and is transmitted and rotated to the PTO shaft 2 through this speed change transmission. Although the PTO clutch 5 is a wet multi-plate type clutch, the clutch case 6 inside the PTO clutch 5 is the final mission case 1.
Since it is an exterior form that can be attached to the rear end surface of
The PTO transmission 5 in the final mission case 1 can be separated from and independently of the PTO transmission 4 to provide a simple structure, which can be easily attached and detached, and the PTO clutch 5 can be easily attached as an option. You can Also, the front-rear length of the final mission case 1 can be limited.

[0005]

[Example] A tractor body has an engine E at the front,
A clutch housing 7, a mission case 8, and a final mission case 1 are connected to the rear side of the engine E. An axle bracket 9 is provided at the front of the engine E, and a front wheel 10 shaft is provided at a lower portion. Mounted front axle housing 11 is supported, and rear axle housings 13 with 12 rear axles are integrally provided on both left and right sides of the rear final transmission case 1, and a lift arm 14 is hydraulically provided on the upper portion. It has a hydraulic case 15 that internally houses a hydraulic cylinder that moves up and down.

A steering seat 17 is provided on the vehicle body between the left and right fenders 16, and a steering handle 18 is provided in front of this. Reference numeral 19 is a main shift lever for operating the main transmission, and 20 is an auxiliary shift lever for operating the auxiliary transmission.
The transmission mechanism is provided with a main clutch and a reverser clutch in a clutch housing 7, and a transmission case 8 is provided with a main transmission device and an auxiliary transmission device, and a traveling bevel pinion shaft of the final mission case 1 is provided. It is transmitted to 21. A transmission shaft 22 of a PTO system is provided at the center of the transmission clutches of the main transmission device and the sub transmission device, and a transmission shaft 23 having a main transmission clutch, an auxiliary transmission clutch 24, etc. is rotatably provided on the outer periphery thereof. ing.

The sub-shift clutch 24 is switched between the shift gear H side on the shift shaft 23, which is transmitted by the main shift, and the low speed gear L side, so that the gear 2 meshes with these gears H, L.
The bevel pinion shaft 21 having the elements 5, 26 integrated therein is transmitted at a variable speed. By the transmission of the bevel pinion shaft 21, the rear wheel 1 is passed through the differential device 27 in the final mission case 1.
2 transmits the axle 28 to the bevel pinion shaft 2
The front wheel transmission shaft 31 that is transmitted from the first gear 26 to the front wheels 10 via the speed increasing clutches 29 and 30 is interlocked. This, etc.
The speed increasing clutches 29 and 30 can switch between a constant speed clutch 29 that transmits the front wheels 10 at substantially the same speed as the rear wheels 12 and a speed increasing clutch 30 that speeds up to almost double the speed.

A transmission shaft 2 in a final mission case 1 is connected to the rear end of the PTO transmission shaft 22, and the rear portion of this transmission shaft 2 is a rear wall 3 of the final transmission case 1.
The bearing 33 is used for bearing 2 and the rear end is projected. A partition wall 34 is provided on the rear side of the differential device 27, and the transmission shaft 2 passes through a bearing hole portion of the partition wall 34. A switching clutch 35 is provided between the front end portion of the transmission shaft 2 and the rear end portions of the PTO transmission shaft 22 and the low speed gear L. When the switching clutch 35 is shifted to the front side, the low speed gear It is possible to form a ground PTO transmission mode in which the transmission is transmitted from L to the transmission shaft 2 and at the same time to the gear 26, and the traveling transmission and the PTO shaft transmission are transmitted in a fixed relationship. When it is shifted to the side, it is connected so as to be transmitted from the PTO transmission shaft 22 to the transmission shaft 2 and can be in a live PTO transmission mode in which the PTO transmission is performed regardless of the traveling speed change.

The PTO transmission 4 includes a partition wall 34 and a rear wall 3.
2, the rotatable transmission shaft 36 is rotatably supported by the bearings 37 and 33 on the outer periphery of the transmission shaft 2, the PTO shaft 3 is borne by the bearing 38, and the intermediate shaft 39 is rotatably borne. Thus, the shift clutches 40, 41 can shift four speeds between the shafts 36, 3, 39 from low speed to high speed.

Further, the PTO clutch 5 for transmitting from the transmission shaft 2 to the transmission shaft 36 is provided inside a clutch case 6 which can be attached and detached to the rear surface of the rear wall 32, and has a wet multi-plate configuration. This PTO clutch 5 has a hydraulic circuit 57.
The cylinder 43 in the clutch coupling 42 is fitted with a piston 43 for pressing the pressure plate. The boss portion 44 of the clutch coupling 42 is spline-fitted to the rear end of the speed change shaft 36 so that the boss portion 44 can rotate integrally and is supported by the bearing 33 with respect to the rear wall 32. This bearing 33
Together with the bearing 37 and the like can be fitted and removed from the rear side into the bearing holes of the rear wall 32 and the partition wall 34 integrally with the variable shaft 36, and the rear side surface of the bearing 33 is the front end portion of the clutch case 6. A ring plate sandwiched between the rear wall 32 and
Stop at 59. 45 is the clutch coupling 42
The clutch core is opposed to the shaft center side, and is spline-fitted to the rear end portion of the transmission shaft 2 to integrally rotate. A wet multi-plate clutch disc 46 is provided between the clutch coupling 42 and the core 45. Reference numeral 47 is a brake for braking the follow-up rotation of the clutch coupling 42 from the PTO shaft 3 when the PTO clutch 5 is disengaged. The brake 47 is provided on the clutch case 6 and is connected to the clutch coupling 42 by hydraulic pressure. Braking can be performed by pressing the integrated brake disk 48.

A hydraulic pipe 58 connected to the rear end of the case 6.
An oil passage 57 communicated with is formed in the rear end portion of the transmission shaft 2, the clutch coupling 42, and the like, communicates with the cylinder portion of the piston 43, and the clutch disc 46.
Nozzle injection is used to refuel the clutch chamber. The lubricating oil in the final case 1 is the bearing 3
Oil is also supplied from the oil passage 57 through the gap 3 into the clutch chamber by nozzle injection.

In the PTO transmission 4, the transmission clutch 40 on the transmission shaft 36 is switched to the front and rear transmission gears 49 and 50, and the transmission clutch 41 on the PTO shaft 3 is moved to the front and rear gears 51 and 52. By switching, the four-stage PTO shaft 3 is shifted through the gears 53 and 54 on the intermediate shaft 39. Shift clutch 40 to the front gear 49 side,
Further, the transmission clutch 41 is shift-engaged to the front gear 51 side, and the transmission is transmitted from the transmission shaft 36 to the transmission clutch 40 → the gear 49.
→ 51 → The first speed is obtained by interlocking with the PTO shaft 3 via the speed change clutch 41. Shift clutch 40 to the front gear 49 side,
Further, the shift clutch 41 is shift-engaged to the rear gear 52 side, and the shift clutch 40 → gear 49 → gear 51 → gear 53.
→ Gear 54 → Gear 52 → PTO through gear clutch 41
The second speed is obtained by interlocking with axis 3. By shifting the shift clutch 40 to the rear gear 50 side and switching the shift clutch 41 to the rear gear 52 side, the shift clutch 40 →
The third speed is obtained by interlocking with the PTO shaft 3 through the gear 50, the gear 52, and the speed change clutch 41. Further, by switching the shift clutch 40 to the rear gear 50 side and the shift clutch 41 to the front gear 51 side, the shift clutch 40 → gear 50 → gear 52 → gear 54 → gear 53 → gear 51 → gear clutch 41 After that, the fourth speed is obtained by interlocking with the PTO shaft 3.

The PTO shaft 3 can be projected rearward through the shaft hole of the clutch case 6 and covered with a cap 55. Reference numeral 56 denotes a PTO rotation sensor attached to the clutch case 6, which detects the rotation speed of the PTO shaft 3. The PT
The O-clutch 5 can be attached and detached together with the clutch case 6. When the bolts for attaching the clutch case 6 to the rear wall 32 are removed and pulled out rearward, the clutch coupling 42 is released rearward from the rear wall 32 together with the bearing 33, and the rear end portion of the transmission shaft 36 is spline-fitted. It also comes off. At this time, the clutch case 6 is disengaged from the PTO shaft 3. Further, the spline fitting of the clutch core 45 at the rear end of the transmission shaft 2 is also released. When the transmission shaft 2 is disengaged together with the PTO clutch 5, the front end portion of the transmission shaft 2 can be disengaged also at the spline fitting portion for the switching clutch 35. At this time, the transmission shaft 2 is replaced by the transmission shaft 36.
It can be inserted and removed through the hollow part of the.

Further, such a PTO clutch 5 is installed in the rear wall 3
2 is not attached to the rear side, the transmission shaft 2 and the speed change shaft 36
As a structure that can be directly transmitted by spline fitting and
A cover plate may be attached to the rear wall 32 and closed.
At this time, the PTO main clutch in the clutch housing 7 may be used as the PTO clutch.

[Brief description of drawings]

FIG. 1 is a side view of a transmission case transmission unit.

FIG. 2 is a side view of the tractor.

[Explanation of symbols]

 1 Final Mission Case 2 Transmission Axis 3 PTO Axis 4 PTO Transmission 5 PTO Clutch 6 Clutch Case

Claims (1)

[Claims] 1. A PTO transmission 4 for transmitting a speed change between a transmission shaft 2 and a PTO shaft 3 is provided at a rear portion of the final mission case 1, and the transmission shaft 2 is provided on a rear end surface of the final mission case 1. A PTO clutch for a tractor in which a clutch case 6 having a wet multi-plate type PTO clutch 5 installed therein is installed.