JP2003172436A - Differential output shaft supporting structure for differential device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a differential device internally mounted in a transmission case to perform accurate differential motion of a differential output shaft, if protruded longer from a differential case, without causing the falling of a gear provided on the differential output shaft during operation. <P>SOLUTION: A differential lock sleeve 21 for engaging with or disengaging from an engagement claw 24 on the side of the differential case 5 is slidably fitted to the differential output shaft 14 protruded from the differential case 5. The differential lock sleeve 21 is pivotally supported by a bearing 25 mounted on the side of the transmission case 2 to form a bearing portion 26 for supporting a middle portion of the differential output shaft 14. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a diff output shaft in a diff device installed in a mission case, and more specifically, even if a diff output shaft projecting long from the diff case is provided on this output shaft. The present invention relates to a support structure for a diff output shaft in a diff device that does not cause the gear to fall over.

[0002]

2. Description of the Related Art Generally, in a traveling vehicle for agriculture such as a rice transplanter for riding, a diff device is provided in a transmission case for transmitting power from an engine to traveling wheels so that the left and right wheels can be moved when the vehicle is traveling straight. It is known that the wheels are rotated at a constant speed so that the wheels on the outside of the turning can be turned smoothly at a higher speed than the wheels on the inside when the vehicle is turning.

Conventionally, a diff output shaft for taking out power from such a diff device is spline-fitted to a side gear whose base end side meshes with a differential pinion, and the tip end side of the diff output shaft protruding from the diff case is While supporting the bearing with the bearing provided in the mission case, the gear provided between them,
It has a structure that meshes with the gear of the axle provided in the rear axle case.

However, since there is a slight gear play in the spline fitting portion with the side gear on the base end side of the differential output shaft, even if the distal end side is supported by the bearing when the differential output shaft is long. However, if the spline fitting part on the base end side is slightly displaced due to the play of the gear, there is a fear that the gear provided on the differential output shaft may fall and hinder smooth power transmission to the axle gear. It was

For this reason, in the conventional diff device, the diff device is always arranged at the center of the mission case so that only one of the left and right diff output shafts protruding from the diff case is not elongated. It was difficult to lay out the inside freely.

[0006]

SUMMARY OF THE INVENTION The present invention was created in order to solve the above-mentioned conventional problems. Even if the diff output shaft is long protruding from the diff case, the diff output shaft The gears installed on the chassis do not fall over, and differential operation can be performed accurately, and the diff system is placed at a position offset from the center of the mission case to allow free layout within the mission case. An object of the present invention is to provide a support structure for a diff output shaft in a diff device capable of increasing the degree.

[0007]

In order to solve the above-mentioned problems, the technical means taken by the present invention is a diff device installed in a mission case, the diff lock engaging and disengaging with an engaging claw on the diff case side. The sleeve was slidably fitted to the differential output shaft protruding from the differential case, and the differential lock sleeve was supported by a bearing mounted on the transmission case side to form a bearing portion for supporting the intermediate portion of the differential output shaft. In addition, the diff device installed inside the mission case is arranged at a position offset from the center of the mission case, and the middle part of the diff output shaft protruding toward the center side of the mission case is supported by a diff lock sleeve. It is characterized by that.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described in detail based on an embodiment shown in the drawings. First, in the cross-sectional view of FIG. 1, reference numeral 1 denotes a diff device installed in a mission case 2. The diff device 1 meshes a gear 4 of a pinion shaft 3 with a ring gear 6 integrated with a diff case 5 as in the conventional device. The support shaft 7 in the differential case 5.
The left and right side gears 9 and 9 are meshed with the differential pinions 8 and 8 which are supported via. Also, the differential case 5
The left and right shaft support portions 10 and 10 are supported by bearings 11 and 11, and the bearings 11 and 11 are fitted to bearing holders 12 and 12 fixed to the mission case 2. 13, 13 are bearing holders 12, 1
Two fixing bolts.

Reference numerals 14 and 14 denote differential output shafts that penetrate the shaft supporting portions 10 and 10 of the differential case 5 and project to the left and right. The differential output shafts 14 and 14 are as shown in an enlarged view of FIG. The base ends are spline-fitted to the splines 15, 15 provided on the boss portions of the side gears 9, 9, respectively, and the tip ends are supported by the mission case 2 by bearings 16, 16. And the differential output shaft 14,
The differential output shaft gears 17, 17 provided near the bearings 16, 16 of 14 are meshed with the drive gears 19, 19 provided on the axles 18, 18 of the rear wheels to transmit the power from the differential device 1 to the rear wheels. It is like this. 20 and 20 are brake devices.

The diff device 1 is a mission case 2
It is placed at a position offset from the center C of the vehicle by a predetermined distance A, and the differential case 5 to the mission case 2
The differential output shaft 14 protruding toward the center C side is formed longer than the other differential output shaft 14.

A long differential output shaft 14 (the right differential output shaft in the drawing) is fitted with a differential lock sleeve that engages and disengages with the differential case 5, and the differential lock sleeve is supported by a bearing mounted on the mission case 2 side. As a result, a bearing portion that supports the intermediate portion of the differential output shaft 14 is configured.

That is, 21 is a diff lock sleeve fitted to the outer periphery of the right diff output shaft 14, and the right half portion of the diff lock sleeve 21 is closely fitted to the outer periphery of the diff output shaft 14 and the left half The part is slidably fitted to a spline 22 provided on the differential output shaft 14. Also, the clutch claw 2 is provided on the left end of the diff lock sleeve 21.
3 is formed, and the shaft supporting portion 1 of the differential case 5 that faces this
An engaging claw 24 that engages and disengages with the clutch claw 23 is formed at 0, and the clutch claw 23 and the engaging claw 24 constitute a differential lock clutch.

The right end portion of the diff lock sleeve 21 is supported by a bearing 25. By supporting the bearing 25 by the bearing holder 12 fixed to the mission case 2, the intermediate portion of the diff output shaft 14 is diff locked. A bearing portion 26 that integrally supports the sleeve 21 is configured.

Further, at the right end portion of the diff lock sleeve 21, a positioning projection 2 that abuts on the rear surface of the bearing 25 is provided.
7 is formed, a return spring 28 for biasing the differential lock sleeve 21 to the right is interposed between the bearing 25 and the bearing 11 supporting the differential case 5, and the clutch pawl is normally provided. 23 is separated from the engaging claw 24 to release the differential lock.

Reference numeral 29 denotes a diff lock lever which is rotated by a manipulator in the cockpit via a wire or the like, and the diff lock lever 29 faces the right end surface of the diff lock sleeve 21. Reference numeral 30 is a positioning step portion of the differential lock sleeve 21 provided on the outer peripheral surface of the differential output shaft 14.

In the differential device constructed as described above,
When the diff lock lever 29 is separated from the diff lock sleeve 21 as shown by the solid lines in FIGS. 1 and 2, the diff lock sleeve 21 is pushed back by the return spring 28, and the clutch claw 23 is separated from the engagement claw 24. Then, the diff lock lever 29 is rotated clockwise as shown by the chain line to move the diff lock sleeve 2
When 1 is pressed against the bias of the return spring 28, the diff lock sleeve 21 slides on the outer peripheral surface of the diff output shaft 14 together with the bearing 25, and the clutch claw 23 engages with the engagement claw 24 in the diff lock state. Therefore, the differential case 5 and the differential output shaft 14 rotate integrally.

The long diff output shaft 14 protruding to the right of the diff case 5 has a base end side spline-fitted with the side gear 9 and a tip 25 only supported by a bearing 25. Since the bearing portion 26 integrally supported with the diff lock sleeve 21 is formed in the intermediate portion of the, the output shaft gear 17 provided on the diff output shaft 14 does not fall and the like, and the differential operation is accurately performed. You can go and transmit power.

Further, even if the differential device 1 is arranged at a position offset from the center C of the mission case 2 by a predetermined distance A, the longer differential output shaft 14 can be reliably supported by the bearing portion 26. It is not always necessary to provide the differential device at the center of the mission case 2, and the degree of freedom of layout within the mission case 2 can be increased.

[0019]

In summary, the present invention is a diff device installed in a mission case, in which a diff lock sleeve engaged with and disengaged from an engaging claw on the diff case is slidably mounted on a diff output shaft protruding from the diff case. In addition to fitting, the differential lock sleeve is supported by a bearing mounted on the mission case side to form a bearing portion that supports the intermediate portion of the differential output shaft. The long differential output shaft that protrudes from the differential case of the differential device installed inside the mission case is installed because it is placed at a position offset from the center and the middle part of the differential output shaft that projects toward the center of the mission case is supported by the differential lock sleeve. Even if it is, the diff lock with the middle part supported by the bearing on the mission case side Since supporting the sleeve as the bearing portion, never causing collapse the gear provided on the differential output shaft, it is possible to accurately differential operation.

Further, since the differential device can be arranged at a position offset from the center of the mission case, the degree of freedom of layout within the mission case is increased and a desired layout can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a diff device installed in a mission case.

FIG. 2 is an enlarged view of a main part.

[Explanation of symbols]

1 differential device 2 mission case 5 differential case 14 differential output shaft 21 diff lock sleeve 24 Engaging claw 25 bearings 26 Bearing

Claims (2)

[Claims] 1. A diff device installed in a mission case, wherein a diff lock sleeve engaged with and disengaged from an engagement claw on the diff case is slidably fitted to a diff output shaft protruding from the diff case, and the diff lock is provided. A support structure for a diff output shaft in a diff device, wherein a sleeve is supported by a bearing mounted on a mission case side to form a bearing portion for supporting an intermediate portion of the diff output shaft. 2. A diff device mounted inside a mission case is arranged at a position offset from the center of the mission case, and a middle part of the diff output shaft protruding toward the center side of the mission case is supported by a diff lock sleeve. A support structure for a differential output shaft in a differential device according to claim 1, characterized in that.