JPH06191301A - Transmission device for tractor - Google Patents

Abstract

PURPOSE:To simplify installation structure and facilitate operation by assembling the clutch for a hydraulic PTO clutch into a small bearing case beforehand and closely fitting the bearing case into an outside rear transmission case. CONSTITUTION:A rear transmission case is connected to a transmission case 7. A bearing case 10 to rotatably support a pinion shaft 9 and a PTO interlocking shaft 5 is fitted closely to a connecting end surface 12 of the rear transmission case 6. Also a hydraulic PTO clutch 11 for the PTO interlocking shaft 5 is installed in the bearing case 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device for a tractor, and a transmission block having a hydraulic clutch which can be turned on and off by hydraulic pressure can be easily assembled in a transmission case. .

[0002]

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION PT
In order to install a hydraulic clutch, such as an O-clutch, which is turned on and off by hydraulic pressure inside the transmission case, the transmission case must be installed.
By connecting the relationship with the oil gear rally etc.
Since the hydraulic piping must be completed, assembling the hydraulic clutch is complicated and troublesome. In view of this, the present invention simplifies the mounting structure by incorporating the hydraulic clutch into a small bearing case in advance, and fitting the bearing case into the outer transmission case in a convoluted manner. , To facilitate the operation.

[0003]

According to the present invention, there is provided a diff device 1, a diff shaft 3 interlocking with the left and right rear wheels 2 from the diff device 1, a PTO shaft 4, and a PT interlocking with the PTO shaft 4.
A rear transmission case 6 having an O interlocking shaft 5 and the like is connected to the front transmission case, and a pinion gear shaft 9 for interlocking the ring gear 8 of the differential device 1 from the joint end face portion 12 and A transmission device for a tractor, in which a bearing case 10 for bearing the PTO interlocking shaft 5 and the like is fitted and mounted, and a PTO clutch 11 for hydraulically operating the PTO interlocking shaft 5 is provided in the bearing case 10. The configuration is as follows.

[0004]

The action and the effect of the invention The pinion gear shaft 9 and the PTO clutch 11 are rotated by the transmission from the transmission device in the transmission case 7. Of these, the differential device 1 is transmitted from the pinion gear shaft 9 via the ring gear 8 and is interlocked with the rear wheel 2 via the left and right differential shafts 3.
Further, the PTO interlocking shaft 5 and the PTO shaft 4 are interlocked by the operation of engaging the PTO clutch 11, so that the working device connected to the vehicle body can be driven.

When the transmission case 7 and the rear transmission case 6 are connected to each other, the pinion gear shaft 9, the PTO interlocking shaft 5 and the like are preliminarily supported by the bearing case 10 and P
Since the TO clutch 11 is assembled in a blocked state, the TO clutch 11 and the PTO clutch 11 are mounted by fitting the TO clutch 11 inward from the joint end face portion 12 of the rear transmission case 6.
The relational position with the interlocking shaft 5 and the relational position with the PTO interlocking shaft 5 and the pinion gear shaft 9 are easily determined, and the PTO clutch 11 and the oil gear rally of the bearing case 10 for operating this are independently preliminarily set. Since it can be processed and assembled, accurate processing, assembly, etc. can be performed easily and easily.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A clutch housing 13 and a front mission case 14 constituting a tractor vehicle body are integrally molded, and a rear mission case 7 is connected to the rear portion thereof. Further, a rear conductive case 6 is connected to this rear portion. Rear axle housings 16 for mounting the axles 15 of the rear wheels 2 are attached to both left and right sides of the rear conduction case 6, and a lift cylinder 18 for vertically moving a lift arm 17 is provided on an upper side.
A hydraulic case 19 having the above components is integrally configured. Reference numeral 20 is a PTO cover which is attached to the rear end face of the rear conductive case 6 and bears the PTO shaft 4.

The front end face of the clutch housing 13 connects the engine E, and the PTO interlocking shaft 2 extends from the clutch housing 13 to the inside of the front transmission case 14.
1 is borne and is interlocked with the crankshaft 22 of the engine E. At the rear end of the PTO interlocking shaft 21, the PTO extends from the rear mission case 7 to the rear conduction case 6.
The interlocking shaft 5 is mounted. Further, the main clutch 23 can be turned on / off by the shifter 24 in the clutch housing 13 to interlock the traveling interlocking shaft 25 outside the PTO interlocking shaft 21.

Inside the front and rear mission cases 14 and 7, rotatably running interlocking shafts 25, 26 and 27 are arranged outside the PTO interlocking shaft 21, and the PTO interlocking shaft 21 is arranged. The transmission shafts 28, 29, 30 and the pinion gear shaft 9 are arranged and supported in parallel with. In addition, front wheel interlocking shafts 31 to 34
Etc. On the traveling interlocking shaft 25, a reverser clutch 35 in the form of a synchro type is freely switchable to the reverser gears 36, 37, and the gear-shifting gear shaft 28 is switched between normal rotation and reverse rotation. Further, main transmission clutches 38, 39 in the form of synchros are made switchable to main transmission gears 40, 41, 42, 43 on the transmission shaft 29 so that the gears on the traveling interlocking shaft 26 can be shifted from the transmission shaft 2
The main shift is linked to 9.

In the latter half of the transmission case 7, sub-shift gears 47, 48 are provided on the pinion gear shaft 9 so as to be switchable to the sub-shift gears 44, 45, 46. The sub-shift clutches 47, 48 are rotatable around the front wheel interlocking shaft 31. A creep gear 51 is meshed between the gear shafts 49 and 50, and the rotation output to the speed change shaft 30 is transmitted to the auxiliary speed change gear 44 of the auxiliary speed change clutch 47.
Is transmitted to the pinion gear shaft 9 by biting against
By engaging the auxiliary transmission clutch 48 with the auxiliary transmission gear 46 side,
It is transmitted from the speed change shaft 30 to the pinion gear shaft 9 via the gear shaft 49, the auxiliary speed change gear 46, and the auxiliary speed change clutch 48. Further, by engaging the sub-transmission clutch 48 with the sub-transmission gear 45 side, the gear shaft 49 extends from the creep gear 51, the gear shaft 50, the sub-transmission gear 45, and the sub-transmission clutch 48 to the pinion gear shaft 9. Heavily transmitted.

The transmission case 7 has a gear 52 at the rear end of the PTO interlocking shaft 21 and a rear PTO.
A PTO gear shift clutch 54 is provided between the interlocking shaft 5 and a rotatable gear 53, and an intermediate gear 55 is meshed between the gears 52, 53 to allow the PTO gear shift clutch 54 to rotate.
To the gear 52 side by engaging the PTO interlocking shaft 5
By directly interlocking the PTO gear shift clutch 54 with the gear 53 side to interlock the PTO interlocking shaft 5 through the intermediate gear 55, the gear 53, the PTO gear shift clutch 54 and the like.

The rear transmission case 6 has a pinion gear shaft 9
, The ring gear 8 meshing with the pinion gear 56 is integrally formed with the diff device 1, and the diff shaft 3 which is differentially rotated by the diff gear in the diff device 1 is mounted to the left and right to support the rear wheel 2. The axle 15 to be mounted is interlocked. The PTO interlocking shaft 5 and the ground PTO interlocking shaft 75 are supported above and below the differential device 1, and the PTO switching gears 57 and 58 are switched between the rear ends of the shafts 5 and 75. A sub speed change clutch 59 is provided to interlock the PTO shaft 4 with the speed change, and further, the PTO sub speed change gear 57 is further provided.
Therefore, the gear 60 on the ground PTO interlocking shaft 75 can be interlocked with the gear 60 via the ground PTO clutch 61.

Between the rear half of the transmission case 7 and the front half of the rear transmission case 6 can be opened by a joint end face portion 12, but the bearing case inside the rear transmission case 6 side can be opened. In the space 10, the pinion gear shaft 9 is attached to the front and rear bearings 6.
2,63 bearing, PTO interlocking shaft 5A bearing 6
4 bearing, the rear end of the front wheel interlocking shaft 31 and the ground PTO
The front end of the interlocking shaft 75 is connected by a gear 65.
Bearing 66, and the rear end of the gear shaft 49 around the front wheel interlocking shaft 31 is bearing 67. The rear end surface of the bearing case 10 that supports each shaft in this manner is attached to the bearing wall 68 of the rear transmission case 6.

The front and rear PTO interlocking shafts 5A and 5B are connected in the bearing case 10 so that the PTO clutch 11 is constructed in the form of a wet friction multi-plate, and the pressure plate 70 in the clutch case 69 is hydraulically operated. By pressing with
The PTO clutch 11 can be turned on and off. Oil passages 71, 72, 7 for operating the pressure plate 70
3 is formed on the bearing wall 68 integrated with the rear transmission case 6, the bearing case 10 connected to the rear transmission case 6, the PTO interlocking shaft 5B, etc., and the hydraulic circuit by the hydraulic pump P1 is connected to the oil passage 71. Then, the hydraulic pressure is sent, and the PTO clutch 11 can be turned on and off by controlling a control valve provided in this hydraulic circuit. Further, the end of the oil passage 74 of the PTO interlocking shaft 5B is closed by the rear end surface of the PTO interlocking shaft 5A that is connected to the front side, but some oil is located on the outer periphery of this portion from the end surface of this oil passage 74. It may be configured to be able to seep into the PTO clutch 11 part.

To mount the bearing case 10 in the rear transmission case 6, the PTO speed change clutch 54, gear 53,
And a PTO interlocking shaft 5A having a PTO clutch 11 and the like
Bearing 64. In addition, the auxiliary shift clutch 4
Bearings 62 and 63 support the pinion gear shaft 9 including the gears 76 and 48, the auxiliary transmission gears 45 and 46, and the gear 76 that meshes with the front wheel interlocking shaft 31 and the ground PTO interlocking shaft 75. Further, the rear end of the gear shaft 49 having the gear 50 is borne by the bearing 67, and the gear 65 fitted in the rear end portion of the front wheel interlocking shaft 31 is borne by the bearing 66. Also, such a bearing case 1
No. 0 is configured to be divided into front and rear parts 10A and 10B for assembling the PTO clutch 11, the gear 65 and the like.

In the rear transmission case 6 incorporating such a bearing case 10, the rear PTO interlocking shaft 5B, the ground PTO interlocking shaft 75, etc. are inserted from the rear with the PTO cover 20 removed. The bearing case 6 and the clutch case.
It is fitted into the gear 69 or the gear 65. On the contrary, after assembling the PTO interlocking shaft 5B and the ground PTO interlocking shaft 75 into the rear transmission case 6, the clutch case 69 and the gear 65 are fitted to them. Alternatively, the bearing case 10 may be assembled.

Further, in such a bearing case 10, the PTO interlocking shaft 5A is connected to the PTO interlocking shaft 5A before being combined with the rear transmission case 6.
Even if the front end of the front wheel interlocking shaft 31 is connected to the rear end of the front wheel interlocking shaft 32 by inserting the front end of the pinion gear shaft 9 into the rear end of the transmission shaft 30 by inserting the front end of the pinion gear shaft 9 into the rear end of the interlocking shaft 21. Good. A gear meshing between the gear shaft 49 and the gear 50.
The pug gear 51 is attached to an opening formed on one side surface of the mission case 7 by a detachable creep case 77.

Further, on one side of the transmission case 7, a hydraulic pump mounting case 78 having the intermediate gear 55 mounted thereon is detachably provided, and the intermediate gear 55 is provided outside the mounting case 78. A pair of front and rear hydraulic pumps P1, P driven via
Install 2. In addition, between the front wheel interlocking shafts 32 and 33 of the front mission case 14, there is a 4W interlocking with the 4WD drive.
A D-clutch 79 and a full-time four-wheel WD clutch 81 for driving the front wheels 80 rather than the rear wheels 2 to a variable peripheral speed are provided, and the front wheels 80 are operated by turning on and off these both clutches 79, 81 with hydraulic pressure. , 4WD transmission and full-time 4WD transmission can be switched and driven. 8
Reference numerals 2, 83 are gears on the 4WD side, and 84, 85 are gears on the full-time 4WD side. The clutches 79 and 81 and the gears 83 and 85 are provided by the front wheel interlocking shaft 33 and the gear 8
2, 84 are borne by each clutch case 86 by the front wheel interlocking shaft 33, and are attached by being entangled from the opening of the front mission case 14. At this time, front wheel interlocking shaft 3
2 is the front wheel kendo shaft 31 on the rear mission case 7 side.
Of the front wheel interlocking shaft 33 is connected to the front end of the front wheel interlocking shaft 34 by a shifter 89. Are connected by.

Reference numeral 91 is a lower link, which is a rear transmission case.
It is attached to the rear end of the space 6 and is connected to the lift arm 17 by a lift rod 92, so that the working machine can be connected to the rear end together with the top link. 93 is a fender, 94 is a cockpit, 95 is a steering wheel, and 96 is a cabin. In FIG. 4, a PTO reverse rotation gear case 97 is attached instead of the pump attachment case 78, and an intermediate gear 98 and a reverse rotation gear 99 are borne by the PTO reverse rotation gear case 97. By engaging the intermediate gear 98 with the gear 52 and the reverse gear 99 with the gear 53, the PTO shaft 4 can be reversely transmitted by switching by the PTO shift clutch 54.

[Brief description of drawings]

FIG. 1 is a sectional view of a mission case portion of a tractor.

FIG. 2 is a sectional view of a mission case portion of the tractor.

FIG. 3 is a side view of the tractor.

FIG. 4 is a sectional view of a mission case part showing a partial front view.

[Explanation of symbols]

 1 Differential Device 2 Rear Wheel 3 Differential Shaft 4 PTO Shaft 5 PTO Interlocking Shaft 6 Rear Transmission Case 7 Mission Case 8 Ring Gear 9 Pinion Gear Shaft 10 Bearing Case 11 PTO Clutch 12 Joint End Face

Claims (1)

[Claims] 1. A diff device 1, a diff shaft 3 interlocking with the left and right rear wheels 2 from the diff device 1, a PTO shaft 4, and a P shaft.
A rear transmission case 6 having a PTO interlocking shaft 5 and the like interlocking with the TO shaft 4 is connected to a front transmission case 7, and a ring gear 8 of the differential device 1 is interlocked from the joint end face 12 thereof. The pinion gear shaft 9 and the bearing case 10 for bearing the PTO interlocking shaft 5 and the like are fitted and mounted, and the PTO clutch 11 for hydraulically operating the PTO interlocking shaft 5 is mounted in the bearing case 10. The tractor transmission that is provided.