JPH0662611A - Power output device of tractor - Google Patents

Abstract

PURPOSE:To simplify the transmission mechanism of the power-taking-out device used when a working machine requiring light loads, attachments, etc., are attached to the abdominal part or front part of the tractor and subjected to the transmission of power, by disposing a reverse rotation gear in a clutch housing in which a power- taking-out transmission shaft, etc., are pivotally attached, and forward projecting the shaft of the reverse rotation gear to form a power-taking-out shaft at the abdominal part. CONSTITUTION:In the engaging transmission of a switch gear 8 to a positive transmission, a shaft is directly engaged and rotated with the switch gear 8, and in the engaging transmission of the positive gear 8 to a positive rotation gear 59, the abdominal power-taking-out shaft 57 of a reverse rotation gear 13 engaged and rotated with the positive rotation gear 5 is subjected to the transmission. Since the abdominal power-taking-out shaft 57 is projected at a place near to the connecting part of the clutch housing 12 to the transmission case 1, the power is easily taken out. Since the power is transmitted through the switch gear 8 for positively or reversely switching the transmission of the power into power-taking-out speed change shafts 35, 45 in the transmission case 1, the positive rotation gear 59 transmitted from the switch gear 8, and the reverse rotation gear 13, a special transmission gear for taking out the power is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power take-off device for a tractor, and an abdominal power take-off shaft that can be easily taken out from the abdomen of the vehicle body in addition to the rear power take-off shaft at the rear of the vehicle body. .

[0002]

2. Description of the Related Art Since the power take-off shaft of a tractor is generally taken out as a rotation having a predetermined deceleration transmission ratio, the speed of the vehicle body is reduced after deceleration in a mission case or the like. It is taken out to the rear. Therefore, in many cases, the abdomen power take-off shaft, the front power take-out shaft, and the like are configured to be linked to the front from the rear power take-off shaft. In such a form, the configuration is complicated, and it is likely to interfere with a mounting work machine or work.

The present invention is particularly intended to allow abdominal power extraction to be easily performed with a simple structure when a light load working machine, an attachment or the like is attached to the abdomen or the front part for transmission. is there.

[0004]

The present invention is directed to a clutch shaft 23 having a main clutch 29, and the clutch shaft 23.
From the power take-off transmission shaft 35 to the power take-off transmission shafts 35 and 45 of the mission case 1 in the clutch housing 12 which is mounted on the clutch housing 12 in the forward and reverse directions. Of the tractor power take-out device, characterized in that a switching gear 8 for changing over to a normal rotation gear 59 and a reverse rotation gear 13 are provided, and the shaft of the reverse rotation gear 13 is projected forward to serve as an abdominal power take-out shaft 57. The configuration.

[0005]

[Operation and Effect of the Invention] Transmission by engine drive is
When the main clutch 29 in the clutch housing 12 is engaged, the power take-off transmission shaft 27 is transmitted via the clutch shaft 23. Further, when the engine is driven, the wheels are transmitted through the clutch housing and the transmission mechanism in the transmission case 1, and the vehicle travels.

The rear power take-off shaft 9 at the rear part of the vehicle body is switched from the power take-off transmission shaft 27 to the forward rotation gear 59 or the reverse rotation gear 59 of the switching gear 8 so that the power take-out transmission shafts 35, 45 are provided.
It is transmitted by switching to forward rotation or reverse rotation. In the meshing transmission of the switching gear 8 to the normal rotation transmission, the meshing rotation is directly performed from the switching gear 8, and in the meshing transmission of the switching gear 8 to the normal rotation gear 59, the meshing from the normal rotation gear 59 is performed. The abdomen power output shaft 57 of the rotating reverse rotation gear 13 is transmitted.

As described above, since the abdomen power take-off shaft 57 is taken out from the vicinity of the connecting portion of the clutch housing 12 with the mission case 1, the abdomen power take-out shaft 57 can be taken out easily, and the power take-out speed changing shaft 35, The transmission gear 45 transmits the power through the switching gear 8 that switches between forward and reverse rotations, the forward rotation gear 59 that is transmitted from the switching gear 8, and the reverse rotation gear 13. No gear is required and the transmission structure is simple.

[0008]

1 to 8, a front wheel 10 and a rear wheel 1 are shown.
A vehicle body 15 of a four-wheel drive type which drives by driving 1 and 1 is configured by connecting a clutch housing 12, a transmission case 1, a (rear) transmission case 5 and the like in series from a front portion, and a front end of the clutch housing 12 An engine E body is connected to the rear transmission case 5, and rear axle housings 14 are protruded from the left and right sides of the rear transmission case 5 so as to axially mount rear wheels 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. 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 rear power output shaft 9, and the front wheel transmission shaft 17 of the traveling differential device 3 of the rear transmission case 5 will be described. The clutch housing 12 receives the reverser shafts 24 and 25, the back counter shaft 26, the power take-off transmission shaft 27, the front wheel transmission shaft 28, and the like, and when the main clutch 29 is engaged on the clutch shaft 23, the reverser shaft 25 and the power are transmitted. Gear transmission is carried out to the take-out shaft 27, and by switching operation of 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 backward 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 a power extraction transmission shaft 46 that is coupled and transmitted from the extraction transmission shaft 35 and is supported between the inner wall 7 and the rear wall 6.

The reverser clutch 30 is a multi-plate type friction clutch, and each main speed change clutch 38, 3 is provided.
The 9 and the auxiliary shift clutches 40 and 41 may have a synchro mechanism. The clutch housing 12
The abdomen power take-out shaft 57 for the mid working machine can be attached to the lower one side of the. The portion of the clutch housing 12 that axially mounts the abdomen power output shaft 57 has a configuration in which the front end portion of the transmission case 1 relatively bulges laterally at the joint portion with the clutch housing 12. Part 5
The abdomen power take-out shaft 57 can be borne by 8 and can be transmitted through the reverse gear 13 that meshes with the forward rotation gear 59 at the front end of the power take-out transmission shaft 45 in the mission case 1. The reverse rotation gear 13 can be meshed with the forward rotation gear 59 by the switching gear 8 on the power take-off transmission shaft 27. When the switching gear 8 meshes with the forward rotation gear 59, The rear power take-off shaft 9 can be transmitted as positive rotation,
Also, assuming that the abdomen power output shaft 57 can also rotate forward, when the switching gear 8 is engaged with the reverse gear 13, the rear power output shaft 9 and the abdominal power output shaft 57 are rotated in the reverse direction.

Reference numeral 49 denotes a lower link extending from the rear end of the rear transmission case 5 to the left and right sides of the rear end of the rear transmission case 5. The lower link is pivoted vertically with a pin 50 with respect to the left and right rear axle housings 14. It is supported. A working machine such as a cultivator is attached to the lower link 49, and the lower link 49 is connected to the lift arm 20 by a lift rod to be controlled up and down. Further, this working machine is transmitted by the rear power take-off shaft 9 at the rear end of the transmission case 5.

Since the abdomen power take-off shaft 57 has a relatively small reduction ratio with respect to the rear power take-off shaft 9, it drives a light load work machine or an attachment. However, as shown in FIG. The work machine mounted on the front side or the abdomen of the vehicle body may be transmitted in association with the front power take-off shaft 51 installed on the lower side of the axle housing 16. The front axle housing 16 can be freely rolled left and right with respect to the front axle bracket 52 integrated with the vehicle body.
Is pivotally supported by the center pivot 53, and the front power take-off shaft 5
1 is provided in parallel below the center pivot 53, and at the rear of the transmission case 54 that bears the front power extraction shaft 51, the abdomen power extraction shaft 57 is provided via a gear 55, a transmission shaft 56, and the like. Is linked to. The front power take-off shaft 51 can take out power from the front and rear of the transmission case 54. A power steering 60 is attached to the front axle bracket 52.

In FIG. 9, the point different from the above example is that the abdomen power output shaft 57 can be transmitted only by the forward rotation gear 59 of the power output transmission shaft 45 by the clutch gear 61. In this embodiment, Reverse rotation transmission of the abdominal power output shaft 57 is not possible. The gear 62 of the power take-off transmission shaft 27 always meshes with the forward rotation gear 59 of the power take-out transmission shaft 45, and the clutch gear 61 on the abdominal power take-off shaft 57 can be disengaged from the forward rotation gear 59.

In such a structure, the power take-off transmission shaft 27
By making the abdomen power take-off shaft 57 and the like compatible, the clutch housing 12 and other transmission shafts can be used in common, and it is possible to easily obtain the specifications in which the power take-out device can be reversed and the specifications in which it cannot. 10 is different from the above example in that instead of the abdominal power output shaft 57, the reverse rotation shaft 63 of the reverse rotation gear 13 is provided. The transmission is the same as in FIG. 1, but not the abdominal power output shaft 57. Therefore, the abdominal power cannot be extracted from now on. The front end side of the reverse rotation shaft 63 is covered with a cap 64.

[Brief description of drawings]

FIG. 1 is a bottom view of an abdominal power extraction shaft portion.

FIG. 2 is a side view of a clutch housing part.

FIG. 3 is a side view of a rear transmission case portion.

FIG. 4 is a front view of a mission case portion.

FIG. 5 is a plan view of a vehicle body section.

FIG. 6 is a side view of the tractor.

FIG. 7 is a side view of a front power extraction shaft portion.

FIG. 8 is a front view thereof.

FIG. 9 is a bottom view of the abdominal power extraction shaft portion.

FIG. 10 is a bottom view of the abdominal power extraction shaft section.

[Explanation of symbols]

 1 mission case 8 power extraction interlocking shaft 9 power extraction shaft 12 clutch housing 13 reverse rotation gear 23 clutch shaft 27 power extraction transmission shaft 29 main clutch 35 power extraction transmission shaft 45 power extraction transmission shaft 57 abdominal power extraction shaft 59 forward / reverse gear

Claims (1)

[Claims] 1. A clutch shaft 2 having a main clutch 29.
3, and the power take-out transmission shaft 2 that is transmitted from the clutch shaft 23 to the power take-out shifting shafts 35, 45 of the mission case 1.
A clutch housing 12 for axially mounting 7 and the like is provided with a switching gear 8 for switching the transmission from the power take-out transmission shaft 35 to the rear power take-off shaft 9 between normal rotation and reverse rotation, a forward rotation gear 59, and a reverse rotation gear 13. A power extraction device for a tractor, characterized in that the shaft of the reverse rotation gear 13 is projected forward to form an abdominal power extraction shaft 57.