JPH1067251A - Front diff-lock device of tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change into a transmission constitution which enables diff-lock operation simply by connecting a final case with a side end part of a front axel housing through a spacer and providing an operation mechanism which is interlocked with a diff-lock mechanism of a differential device on this spacer. SOLUTION: A front axel housing 2 incorporates a front wheel differential device 1 in substantially central part thereof and can interlock differential shafts 24, 25 on the right and left. Spacers 3 having certain width are connected with both ends on the right and left of the front axel housing 2 by using a bolt 35, and a final case 4 is connected with an outer side of the spacer 3 by using a bolt 36 to integrate them. A cam shaft 38 having a cam 37 in an upper part on a rear side is provided on the spacers 3 on the right and left. By operating an arm on an outer side by a wire in the interlocking relationship and pressing a slide cylinder 32 on a spring 41 by a cam 37 to press it on a diff-lock mechanism 5 side, a diff-lock claw 33 is engaged with a diff-lock claw 30 on one side end of a differential case 27 to perform diff-locking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front differential lock device for a tractor, and more particularly, to a differential lock device in a front axle housing on which front wheels are mounted.

[0002]

In a tractor driven by front wheels or front and rear wheels, there is a type in which a differential device is provided in a front axle housing on which a front wheel is mounted to enable differential locking. The present invention makes it possible to easily implement a differential lock mechanism and an operation mechanism thereof on a front axle housing having no differential lock mechanism with a simple configuration.

[0003]

According to the present invention, a differential device 1 is provided.
A front differential lock for a tractor having a final case 4 connected to a side end portion of a front axle housing 2 having a spacer 3 and a differential lock mechanism 5 of the differential device 1 interlocked with the spacer 3. The configuration of the device.

[0004]

The differential device 1 in the front axle housing 2 is differentially linked to the left and right front wheels. When the differential lock mechanism 5 of the differential device 1 is fixed or released, the operation mechanism 6 of the spacer 3 is operated in conjunction with the differential lock mechanism 5 in the front axle housing 2.

The operating mechanism 6 for operating such a differential lock mechanism 5 has such an operating mechanism 6 since it is integrally provided on the spacer 3 between the front axle housing 2 and the final case 4. By interposing the spacer 3 or replacing it with the spacer 3, it is possible to easily change to a transmission configuration that allows a differential lock operation.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tractor body 7 has a clutch housing 8, a front transmission case 9, and a rear transmission case 10 sequentially connected to the rear side of a front engine E to form an integral structure. Rear axle housings 11 are provided on both sides, and rear wheels 12 are mounted on the shafts.
The center portion of the front axle housing 2 is pivotally supported by a center pivot so as to freely roll left and right.

When the engine E is driven, the rear wheel 12 is interlocked with the clutch and reverser in the clutch housing 8, the transmission in the front transmission case 9, the rear wheel differential in the rear transmission case 10, and the like. . Further, after passing through the transmission in the front transmission case 9, the front wheel differential shaft 1 in the front axle housing 2 can be transmitted by the front wheel take-out shaft 14 via the switching mechanism of two-WD and four-WD acceleration.

Reference numeral 15 denotes a bonnet, and 16 denotes a steering handle. In this steering operation, a steering case 19 equipped with a front wheel 18 axle 20 is steered around a king pin 17 with respect to a final case 4 at the front end of the front axle housing 2. Rotate. Reference numeral 21 denotes a cabin, reference numeral 22 denotes a seat, and reference numeral 23 denotes a lift arm to which a working device is attached and which moves up and down. The front axle housing 2 has a front wheel differential device 1 installed at a substantially central portion, and can interlock differential shafts 24 and 25 extending left and right. Reference numeral 26 denotes a bevel gear interlocked with the front end of the front wheel take-out shaft 14, which integrally rotates a differential case 27. 28,
Reference numeral 29 denotes bearings for bearing the left and right sides of the differential case 27.

The differential lock mechanism 5 includes a differential case 2
7 and the differential shaft 24 on this side.
The differential case 27 and the differential shaft 24 rotate integrally with each other by the engagement of the differential lock pawls 33 at the inner end of the slide cylinder 32 which is integrally rotated with the differential lock pawls 33 by engaging the differential lock pawls 30 with each other. , This differential lock claw 30,
With the detachment of 33, the differential shaft 24 can rotate from the differential case 27 via the differential gear.

A spacer 3 having a fixed width is connected to the left and right ends of the front axle housing 2 by bolts 35, and the final case 4 is bolted to the outside of the spacer 3 by bolts 36.
To connect and integrate. The left spacer 3 is provided with a cam shaft 38 having a cam 37 on the upper rear side, and by operating the outer arm 39 in conjunction with a wire 40, the cam 37 pushes the slide cylinder 32 against the spring 41 to cause the differential lock. By pressing to the mechanism 5 side, the differential lock claw 33
Can be engaged with 30 to diff lock.
Reference numeral 42 denotes a stopper which receives the pressing of the slide cylinder 32 by the spring 41.

The arm 39 for interlocking with the differential lock mechanism 5 of the front axle housing 2 is projected to the rear side of the front axle housing 2 and interlocks to prevent damage due to contact with an obstacle or the like during traveling. Also, the cam shaft 38 which is the support shaft of the arm 39 is
By providing the front axle housing 2 above the differential shaft 24, the front axle housing 2 can be located above the oil level housed in the housing 2, and oil leakage can be reduced.

Reference numeral 43 denotes a bracket fixed to the spacer 3 for receiving the outer of the wire 40. The differential shafts 24 and 25 are interlocked with the king pin 17 via a bevel gear 44, and further rotate the axle 20 from the lower end of the king pin 17 via a bevel gear 45. The steering case 19 has a steering arm 46, a tie rod 47, a drag rod 48, and the like, and is turned around the king pin 17 by an operation from the steering handle 16 to be steered.

When changing the tread of the front axle housing 2, the left and right spacers 3 are changed to have different lengths, or the final case 4 is directly connected to the lateral end of the front axle housing 2. At this time, the length of the differential shafts 24 and 25 provided inside these components is selected according to the tread. In the specification without the differential lock mechanism 5, it is preferable to use the spacer 3 without the operation mechanism 6.

[Brief description of the drawings]

FIG. 1 is a rear view of a front axle housing part and a rear view showing an operation of a part thereof.

FIG. 2 is a plan view thereof.

FIG. 3 is an exploded perspective view of a part thereof.

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

FIG. 5 is a side view of the tractor.

[Explanation of symbols]

 Reference Signs List 1 differential device 2 front axle housing 3 spacer 4 final case 5 differential lock mechanism 6 operating mechanism

Claims (1)

[Claims] An operation mechanism (6) for connecting a final case (4) to a side end of a front axle housing (2) having a differential device (1) via a spacer (3) and interlocking a differential lock mechanism (5) of the differential device (1) to the spacer (3). A front differential lock device for a tractor that is provided with: