JPS6321451Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a power take-off device for driving the front wheels of a vehicle.

(Prior art) In a vehicle such as a tractor, a power extraction case having a power extraction gear is attached to the lower abdomen of the vehicle body,
A device in which power is transmitted from the power take-off gear to the input shaft of the front wheel differential device via the propulsion shaft is disclosed in Japanese Utility Model Publication No. 55-48568.

(Problem that the invention aims to solve) Conventionally, the power take-off case was attached to the bottom wall of the transmission case connected to the rear of the engine via the clutch housing, which had the disadvantage of making the propulsion shaft very long. It was hot. Furthermore, since the power take-off case and propulsion shaft are located on the underside of the transmission case, this has the disadvantage of lowering the ground clearance, especially for tractors that perform furrow work. There are important problems in terms of work performance.

In view of these conventional problems, the present invention aims to shorten the length of the propulsion shaft and ensure sufficient ground clearance.

(Means for Solving the Problems) The present invention provides a vehicle body by sequentially connecting clutch housings 3, 4 containing a clutch device 8 and a transmission case 5 containing a power transmission mechanism to the rear of the engine 2. A clutch release mechanism 10 is provided on the rear side of the clutch device 8 within the clutch housings 3 and 4 to connect and disconnect the clutch device 8, and a power take-off gear connected to the power transmission mechanism is provided in the lower abdomen of the vehicle body 1. In a vehicle that is provided with a power take-off case 37 having a power take-off gear 38, 39 and transmits power from the power take-off gears 38, 39 to the front wheel differential device via the propulsion shaft 51, the following technical measures are taken. Thus, the above-mentioned objective was achieved.

That is, the present invention provides the clutch housing 3,
4 and on the front side of the partition wall 46 between the clutch housings 3, 4 and the transmission case 5, it is separated from the clutch housings 3, 4 by a chamber wall 35 integrally formed with the partition wall 46. The power take-off chamber 35A is recessed upward toward the clutch release mechanism 10, and the power take-off gear 38,
The power take-off case 37 is attached to the lower opening 35B side of the power take-off chamber 35A so that the upper side of the power take-off chamber 39 fits within the power take-off chamber 35A.

(Example) The present invention will be described in detail below with reference to the illustrated embodiment.

In FIGS. 1 and 2, reference numeral 1 denotes a tractor body, which is constructed by sequentially connecting a front clutch housing 3, a rear clutch housing 4, a transmission case 5, etc. to the rear of an engine 2. 6 is a front wheel, and 7 is a rear wheel. Reference numeral 8 denotes a clutch device, which is attached to the crankshaft 9 of the engine 2 within the front clutch housing 3, and is connected to the clutch release mechanism 1.
0 operation allows the traveling main shaft 11 and the PTO main shaft 12 to be connected to each other. The main shafts 11 and 12 are configured as dual inner and outer shafts, and the main shaft 11 is connected to the rear wheels 7 via power transmission mechanisms such as a forward/reverse switching mechanism 13, a main transmission mechanism 14, an auxiliary transmission mechanism 15, and a rear wheel differential 16. In addition, the PTO main shaft 12 is interlocked with the PTO transmission mechanism at the rear of the transmission case 5 via the PTO transmission shaft 17. The forward/reverse switching mechanism 13 includes gears 19, 2 provided on the traveling main shaft 11 and the first transmission shaft 18.
0, etc., and the shifter 21 can switch the first transmission shaft 18 between forward and reverse directions. The main transmission mechanism 14 includes a gear group 23 of different diameters on the second transmission shaft 22,
It is composed of a gear group 25 of different diameters on a third transmission shaft 24 that loosely fits into the PTO transmission shaft 17. The sub-transmission mechanism 15 is composed of a gear 27 on a fourth transmission shaft 26 that is fitted onto the PTO transmission shaft 17, a gear 29 on a bevel pinion shaft 28, and the like. 30 is the first
The front wheel transmission shaft is operatively connected to the bevel pinion shaft 28 via gears 31 and 32. Reference numeral 33 denotes a first front wheel transmission shaft, which is connected to the first front wheel transmission shaft 30 via a shifter clutch 34 so as to be disconnectable.

36 is a power take-off device, and the power take-off case 3
7, etc., and is provided in a power take-off chamber 35A recessed toward the release mechanism 10 at the lower part of the rear clutch housing 4.

The power take-off chamber 35A is located in the rear clutch housing 4.
It is separated from the rear clutch housing 4 by a chamber wall 35 integrally formed with a partition wall 46 between the transmission case 5 and the transmission case 5. The power take-off chamber 35A has a lower opening 35B, and the lower opening 35B is located above the bottom wall 5a of the transmission case 5. Note that the bottom wall 3a of the front clutch housing 3 is located above the lower opening 35B.

The power take-off case 37 has a pair of power take-off gears 38 and 39, and is attached to the lower opening 35B side of the power take-off chamber 35A so that the upper power take-off gear 38 fits within the power take-off chamber 35A. . The power take-off gear 38 is inserted into and supported by a relay shaft 40, and the relay shaft 40 has a pair of front and rear ball bearings 4.
1 and 42, and is supported by bearing holding parts 43 and 44 of the power take-off case 37, and is detachably connected to the front end of the second front wheel transmission shaft 33 from the front side via a shaft joint 45. Note that the shaft joint 45 is connected to the partition wall 46.
It is loosely fitted into the through hole 47 of. Power take-off gear 3
9 is supported by a propulsion shaft 51 that is removably inserted from the front side into this gear 39 and ball bearings 48 and 49 arranged on both front and rear sides of the gear 39, and each of the ball bearings 48 and 49 is connected to the power take-off case 37.
are fitted into the respective bearing holding holes. The ball bearing 49 has a slightly smaller diameter than the ball bearing 48, and the propulsion shaft 5 is mounted on the front edge side of the inner ring of the ball bearing 49.
The stepped portion 51a of No. 1 comes into contact with the propulsion shaft 5.
1 is restrained so that he cannot move backwards. Propulsion shaft 5
1 is for transmitting power to the input shaft of the front wheel differential device in the front axle case 52, and the front end of this propulsion shaft 51 can be freely inserted and removed from the rear into a shaft joint that is spline-fitted to the input shaft. It is inserted and prevented from moving forward by a pin. Note that the shaft joint cannot be moved forward, but can be inserted into and removed from the input shaft from the rear. The propulsion shaft 51 is protected from the outer periphery by a cover 53.

Next, the effect will be explained. In the above configuration, when the shifter clutch 34 is connected, the front wheel transmission shaft 30,
Power is transmitted from 33 to the input shaft of the front wheel differential via the shaft coupling 45, relay shaft 40, power take-off gears 38, 39, propulsion shaft 51, and shaft coupling, and drives the front wheels 6 in synchronization with the rear wheels 7. I can do it.

If it is necessary to change the slip ratio of the front and rear tires, the power extraction case 37 is removed and the power extraction gears 38, 39 are replaced with other gears. In this case, if the bolts securing the power take-off case 37 to the rear clutch housing 4 are removed, the relay shaft 40
is removably connected to the transmission shaft 33 from the front side via the shaft coupling 45, so that the power extraction case 3 along with the relay shaft 40, power extraction gears 38, 39, etc.
7 can be easily taken out, and its power take-off gears 38, 39 can be easily replaced externally. In this case, the dimension A between the bearing holding portion 43 and the front wall of the power take-off chamber 35A is made larger than the dimension B of the fitting portion of the relay shaft 40 to the shaft coupling 45.

(Effect of the invention) According to the invention, the power take-off case 37 is located at the rear lower part of the clutch housings 3, 4, and the power take-off gears 38, 39 of the power take-off case 37 pass through the propulsion shaft 51 to the front wheel differential device. Since power is transmitted, the length of the propulsion shaft 51 can be shortened. Also clutch housing 3,
A power take-off chamber 35A is provided at the rear lower part of the power take-off chamber 35A, and the power take-off case 37 is attached to the lower opening 35B side of the power take-off chamber 35A so that the upper sides of the power take-off gears 38 and 39 are accommodated within the power take-off chamber 35A.
The propulsion shaft 51 can be provided at approximately the same height as the bottom wall 5a of the transmission case 5, and the power extraction case 3
7. The propulsion shaft 51 does not limit the ground clearance to a low level.

Further, the power take-off chamber 35A is located inside the clutch housings 3 and 4, but is partitioned by a chamber wall 35 that is integrated with the partition wall 46, so lubricating oil etc. cannot enter the clutch housings 3 and 4 from the transmission case 5 side. Nor.

In addition, a clutch release mechanism 10 is provided in the clutch housings 3 and 4 on the rear side of the clutch device 8.
Therefore, in the present invention, a space is inevitably created at the rear lower part of the clutch housings 3, 4, and a partition wall between the clutch housings 3, 4 and the transmission case 5 is created using this space. 46
A power take-off chamber 35A is provided on the front side of the
Therefore, the power take-off chamber 35A can be provided and the power take-off gears 38, 39 can be incorporated without being related to the power transmission mechanism in the transmission case 5, and the presence of the power take-off chamber 35A imposes restrictions on the power transmission mechanism. never be done. Moreover, if the power take-off chamber 35A is located on the rear side of the partition wall 46, that is, inside the transmission case 5, the chamber wall 35 cannot be provided in a large concave shape upwardly due to the relationship with the power transmission mechanism inside. , the ground clearance will be limited due to low ground clearance,
Since the rear lower space inside the clutch housings 3 and 4 is utilized, the chamber wall 35 of the power take-off chamber 35A is recessed upwardly toward the clutch release mechanism 10 within a range that does not interfere with the clutch release mechanism 10. Therefore, the power take-off chamber 3
Even if 5A is formed to be large, the influence on the ground clearance is reduced, so that the ground clearance is not limited to a low level.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with Fig. 1 being a side view of the whole, Fig. 2 being a sectional side view of the power transmission system, and Fig. 3 being a side sectional view of the power transmission system.
The figure is a sectional view of the main part. 1... Tractor body, 2... Engine, 3, 4
...Clutch housing, 5...Mission case, 5a...Bottom wall, 8...Clutch device, 10...
...Release mechanism, 30, 31...Front wheel transmission shaft, 3
5... Chamber wall, 36... Power take-off device, 35A...
Power take-off chamber, 35B... lower opening, 37... power take-off case, 38, 39... power take-off gear, 5
1...Propulsion axis.

Claims (1)

[Claims for Utility Model Registration] The vehicle body 1 is constructed by sequentially connecting clutch housings 3 and 4 containing a clutch device 8 and a transmission case 5 containing a power transmission mechanism to the rear of the engine 2. A clutch release mechanism 10 is provided on the rear side of the clutch device 8 within the housings 3 and 4 to connect and disconnect the clutch device 8, and
A power take-off case 37 having power take-off gears 38 and 39 interlocked with the power transmission mechanism is provided in the lower abdomen of the vehicle, and power is transmitted from the power take-off gears 38 and 39 to the front wheel differential device via the propulsion shaft 51. In such a vehicle, a chamber wall 35 integrally formed with the partition wall 46 is provided at the rear lower part of the clutch housings 3, 4 and on the front side of the partition wall 46 between the clutch housings 3, 4 and the transmission case 5. A power take-off chamber 35A separated from the clutch housings 3 and 4 is recessed upward toward the clutch release mechanism 10, and the power take-off case 37 is arranged so that the upper sides of the power take-off gears 38 and 39 are accommodated in the power take-off chamber 35A.
A power take-off device for driving a front wheel of a vehicle, characterized in that the power take-off chamber 35A is attached to a lower opening 35B side of the power take-off chamber 35A.