JPH0646606A - Power take-off device of tractor - Google Patents

Abstract

PURPOSE:To selectively obtain live PTO shape and grand PTO shape using a simple constitution and simultaneously lower production cost in a power take-off device of a tractor. CONSTITUTION:The objective power take-off device of a tractor is constituted by forming middle walls 7 in a running deaf device 3 transmitted through a transmission 2 in a transmission case 1, in the rear part of a transmission case having a ring gear 4 and between the ring gear 4 and back wall 6 of transmission case 5 and selectively providing a power take-off shaft 9 capable of taking out transmission from a power take-off interlocking shaft 8 on the transmission case side 1 and interlock from the rear part of the ring gear 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power extraction device for a tractor, and selectively obtains a normal live (motor) PTO form and a ground PTO form with a simple structure.

[0002]

2. Description of the Related Art As a form of interlocking a power take-off shaft, there are a live PTO which is independently interlocked with traveling power transmission and a ground PTO which has a certain interlocking relation with traveling power transmission. The form is also transmitted from the power take-out interlocking shaft side under the mission case to the power take-out shaft,
Since the interlocking structure in the mission case is different, the common structure of both forms tends to complicate the structure.

[0003]

According to the present invention, a traveling differential device 3 is transmitted through a transmission 2 of a transmission case 1, and a rear portion of a transmission case 5 having this ring gear 4 is provided.
An intermediate wall 7 is provided between the ring gear 4 and the rear wall 6 of the transmission case 5.
And a power take-off shaft 9 capable of selectively taking out the transmission from the power take-out interlocking shaft 8 on the side of the mission case 1 and the transmission from the rear part of the ring gear 4 across the inner wall 7 and the rear wall. The tractor power take-off device is provided.

[0004]

In the live PTO-dedicated form, since the power take-off shaft 9 is configured to be transmitted only from the power take-out interlocking shaft 8, the transmission from the ring gear 4 on the side of the traveling differential device 3 is performed. I don't know Live PTO and Grand P
In the case where both TO and TO can be output, a portion projecting forward from the inner wall 7 of the power take-off shaft 9 is meshed and transmitted from the rear part of the ring gear 4 of the traveling differential device 3 to form a ground PTO form. Power can be taken out.

In this way, the inner wall 7 in the transmission case 5 and
The power take-off shaft 9 is laid across the rear wall 6, and from the ring gear 4 integrated with the traveling differential device 3 on the front side of the inner wall 7,
Directly engages the power take-off shaft 9 for transmission, and
The O type can be selected, the transmission case 5 of the tractor having the ground PTO specification and the transmission case 5 of the tractor not having the ground PTO specification can be mutually compatible, and the configuration is simple.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A four-wheel drive type vehicle body 15 which drives by driving front wheels 10 and rear wheels 11 has a clutch housing 12, a transmission case 1, a (rear) transmission case 5 and the like connected in series from the front. The front end of the clutch housing 12 is connected to the engine E body, and the rear axle housing 14 is protruded on both left and right sides of the rear transmission case 5 to axially mount the rear wheel 11. Reference numeral 16 denotes a front axle housing for mounting the front wheel 10, which is driven by a transmission device in the transmission case 1 via a front wheel transmission shaft 17 and the like. Reference numeral 18 is a steering handle, 19 is a hydraulic case having a lift arm 20, 21 is a fender, and 22 is a driver's seat.

Clutch shaft 2 in clutch housing 12
An outline of a transmission device from 3 to the ring gear 4, the power take-off shaft 9, and the front wheel transmission shaft 17 of the traveling differential device 3 of the rear transmission case 5 will be described. In the clutch housing 12,
The reverser shafts 24 and 25, the back counter shaft 26, the power take-off transmission shaft 27, the front wheel drive shaft 28, etc. are supported by the main clutch 29 on the clutch shaft 23, and the reverser shaft 25 and the power take-off shaft 27 are geared. The reverser shaft 24 is transmitted, and by switching the reverser clutch 30 on the reverser shaft 24, the reverser shaft 24 can be switched between forward rotation and reverse rotation for forward and reverse transmission.

The transmission case 1 includes a main transmission shaft 31,
32, an auxiliary transmission shaft 33, a pinion shaft 34, power take-out transmission shafts 35, 45, front wheel transmission shafts 36, 37, etc., and the rotation of the reverser shaft 24 is controlled by the main transmission clutches 38, 39 on the main transmission shaft 31. The main shift is performed by the switching operation of, and the auxiliary shift shaft 3
The pinion shaft 34 can be speed-change-transmitted by a switching operation of the auxiliary shift clutch 40 on the No. 3 and the auxiliary shift clutch 41 on the pinion shaft 34. From the pinion bevel gear 42 at the rear end of the pinion shaft 34, the ring gear 4 of the traveling differential device 3 is meshed and transmitted to the rear wheel 11.

The front wheel transmission shaft 1 for driving the front wheels 10
Reference numerals 7 and 28 denote the pinion shaft 34 and the front wheel transmission shafts 36 and 3 respectively.
7, the front wheel transmission shaft 28 is transmitted to the front wheel transmission shaft 28 by bypassing the front wheel transmission shaft 37 by the engagement of the speed increasing clutch 43 on the front wheel transmission shaft 36.
On the other hand, it is transmitted to about twice as many rotations (during steering), and when the speed increasing clutch 43 is disengaged, the front wheel transmission shaft 36 is directly transmitted to the front wheel transmission shaft 28 side, and the front wheel 10 is transmitted to the rear wheel 1.
It is possible to transmit about the same rotation as 1 (when traveling straight).

The transmission structure of the power take-out transmission shaft 35 is such that the power take-out transmission shaft 4 is transmitted from the power take-out transmission shaft 27.
5 has a power take-out shift gear 44 capable of changing speed between the main gear shift shaft 32 and the main take-off shaft 32 and is transmitted to the power take-out shift shaft 35 and the power take-off shaft 9. The power take-off shaft 9 for the rear-mout working machine projects rearward from the rear wall 6 of the rear transmission case 5 so as to interlock with a working machine such as a tiller, and the front end thereof is borne by the inner wall 7, Gears 47 and 48 are transmitted from the power take-out transmission shaft 46 that is coupled and transmitted from the take-out speed changing shaft 35 and is supported between the inner wall 7 and the rear wall 6 (as shown in FIG. 1, live PTO-only form). Power output interlocking shaft 8
Are the power take-out transmission shaft 35 and the power take-out transmission shaft 46.
Etc.

The inner wall 7 has a ring (bevel) gear 4 for transmitting the traveling differential device 3 by a pinion bevel gear 42.
The pinion shaft 50 of the pinion bevel gear 49 is borne by the inner wall 7 at a position close to the rear side, and the live P is provided between the pinion shaft 50 and the power take-off shaft 9.
A PTO switching clutch 51 for switching between the TO and the ground PTO is provided, and the PTO switching clutch 51 is spline-fitted to the pinion shaft 50 side so that the ring gear 4 moves to the pinion bevel gear 49, the pinion shaft 50, P.
The power is transmitted to the power take-off shaft 9 in the order of the TO switching clutch 51 and the like, and the traveling mode and the power take-off transmission are in a constant transmission ratio of the ground PTO. Also, by switching the PTO switching clutch 51 to the gear 48 side on the power take-off shaft 9 and engaging the clutch, the transmission from the ring gear 4 side is cut off, and the power take-off transmission shaft 46 side moves to the gear 4 side.
7, 48, the PTO switching clutch 51, and the like are transmitted to the power take-off shaft 9 in this order, and the drive transmission and the power take-out transmission are transmitted in a speed-changing manner independently (see FIG. 1).

Therefore, in the transmission case 5 having the ring gear 4 and the inner wall 7 as described above, the power take-off shaft 9 and the gear 4 are provided.
2, the pinion shaft 50, the PTO switching clutch 51, etc.
By separately preparing the live PTO type and the grand PTO type as described above, the transmission case 5 and other components are shared, and a tractor for a PTO transmission of a different type is obtained.

Power take-off shaft 52 for mid-mout working machine
Is borne by the power take-out case 53 attached to the lower side of the rear transmission case 5, and the power take-out transmission shaft 46 is
Is transmitted from the gear 47 through the counter gear 54, the gear 55 on the power take-out shaft 52, and the like. This power take-off shaft 52 is interlocked with the input shaft of a working machine mounted on the abdomen of the vehicle body 15 such as a mid mower, toward the front. In such a tractor specification that does not require the power take-out shaft 52, the opening 56 at the bottom of the power transmission case 5 may be closed with a simple lid instead of the power take-out case 53.

A power take-off shaft 57 for a mid working machine can be attached to one side of the lower portion of the clutch housing 12.
The portion of the clutch housing 12 on which the power take-out shaft 57 is mounted has a form in which it is relatively bulged laterally at the joint with the clutch housing 12 at the front end of the transmission case 1. The power take-off shaft 57 can be borne by 58 and can be transmitted through a gear 60 that can mesh with a gear 59 at the front end of the power take-off transmission shaft 45 in the mission case 1.

[Brief description of drawings]

FIG. 1 is a side view of a power output shaft portion.

FIG. 2 is a side view of a rear transmission case portion.

FIG. 3 is a side view of a clutch housing portion.

FIG. 4 is a bottom view of a part thereof.

FIG. 5 is a front view of a mission case portion.

FIG. 6 is a side view of the tractor.

[Explanation of symbols]

 1 mission case 2 transmission 3 traveling differential device 4 ring gear 5 transmission case 6 rear wall 7 middle wall 8 power take-out interlocking shaft 9 power take-out shaft

Claims (1)

[Claims] 1. A ring gear 4 and a transmission case 5 at the rear of a transmission case 5 having a traveling differential device 3 and a ring gear 4 which are transmitted via a transmission 2 of a transmission case 1.
An inner wall 7 is formed between the rear wall 6 and the rear wall 6, and transmission from the power take-out interlocking shaft 8 on the side of the transmission case 1 and transmission from the rear portion of the ring gear 4 are performed across the inner wall 7 and the rear wall. A power extraction device for a tractor, which is provided with a power extraction shaft 9 that can be selectively extracted.