JPH1061748A - Differential gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a constitution of a differential lock device, in a differential gear device without having a differential case, comprising a pair of axles, differential ring gear, differential pinion fitted to a fitting hole provided in the differential ring gear and a differential side gear provided on both sides of the differential ring gear to be meshed with the differential pinion. SOLUTION: This differential gear device is constituted such that in one side surface of a differential gear 12, a plurality of fitting recessed parts 12c are provided, a slide member 22 having a protruded part 23 extended in the lengthwise direction is arranged to be opposed to the fitting recessed part 12c, the protruded part 23 of the slide member 22 is engaged with the fitting recessed part 12c through a through hole 17a provided in differential side gears 17L, 17R. The fitting recessed part 12c engaging the protruded part 23 of the slide member 22 is provided in a member constituted in a separate unit from the differential ring gear 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential gear device having no differential case, a meshing portion between a differential ring gear and a final pinion, and a configuration of a differential lock device.

[0002]

2. Description of the Related Art In a traveling vehicle, it is not possible to transmit power from a drive source such as an engine or a motor to a differential gear device in a differential gear case via a transmission shaft, and to differentially drive the left and right axles by the differential gear device. Conventionally, the differential gear device transmits power from a transmission shaft to a differential ring gear, and transmits power from the differential ring gear to left and right axles via a differential pinion and a differential side gear. A differential gear device with a differential lock mechanism without a differential case has been known in order to improve the straightness and traveling performance in muddy by providing a differential lock device in the differential gear device, and to simplify the configuration of the differential gear device. ing. For example, the techniques of Japanese Utility Model Application Laid-Open No. 54-157787 and Japanese Utility Model Application Laid-Open No. 1-60932 are disclosed.

[0003]

Problems to be Solved by the Invention
The differential gear device of No. 7787 is configured such that power from a final pinion is transmitted to a differential ring gear, and power is transmitted from the differential ring gear to left and right axles via a differential pinion and side gears. However, since the differential pinion is rotatably supported on a pinion shaft protruding in the radial direction at the outer peripheral portion of the pinion disk, and the differential ring gear is further fixed to the outer peripheral portion, processing of the pinion disk is very difficult, The structure was complicated and the structure was difficult to assemble, resulting in high costs.

Further, the differential gear device disclosed in Japanese Utility Model Laid-Open No. 1-60932 does not have a differential case, but is provided with a differential lock device. The differential lock device cannot rotate the slider on the axle, but slides outward in the axial direction. The differential lock pin is attached to the tip of the slider, and the differential lock pin is engaged with an engaging portion formed on a differential ring gear outside the differential pinion to perform differential lock. Therefore, the radius of the slider becomes large, the slider takes up extra space, and the differential gear device becomes large.

[0005]

Means for Solving the Problems The present invention is configured as follows to solve the above-mentioned problems. That is, a differential gear that does not have a differential case including a pair of axles, a differential ring gear, a differential pinion that is inserted into an insertion hole provided in the differential ring gear, and a differential side gear that is provided on both sides of the differential ring gear and meshes with the differential pinion. An apparatus, wherein a plurality of fitting concave portions are provided on one side surface of the differential ring gear, and a sliding member having a convex portion extending in a longitudinal direction is arranged opposite to the fitting concave portion, and the convex portion of the sliding member is provided. Is configured to engage with the fitting recess through a through hole provided in the differential side gear. Further, a fitting concave portion with which the convex portion of the sliding member is engaged is provided on a member formed separately from the differential ring gear.

[0006]

Next, examples will be described. 1 is a sectional view showing a first embodiment of a differential gear device having a differential lock mechanism of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a sectional view of a second embodiment of a differential ring gear of the differential gear device, and FIG. FIG. 5 is a side view and FIG. 5 is an exploded perspective view.

In FIGS. 1 and 2, upper and lower (or front and rear)
Axle case 1 divided in half and final shaft 2
The final shaft 2 is rotatably supported on the axle case 1 via a bush 4 and a bearing 5. A reduction gear 6 is fixedly mounted on one side of the final shaft 2, and power is transmitted from a transmission (not shown) (not shown).

A final pinion 7 is formed on the outer periphery of a central portion of the final shaft 2, and a differential ring gear 12 of a differential gear device is engaged with the final pinion 7. Collars 10 and 11 are externally fitted on the final shaft 2 on both sides of the meshing portion between the final pinion 7 and the differential ring gear 12, and the differential case is not provided, so that the differential ring gear 12 does not fall to the side. I have to. The differential ring gear 12 is formed into a large-diameter disk shape by a sintered member, and has tooth portions 12d around the periphery thereof, thereby improving formability and wear resistance. An insertion hole 12a is opened in the center of the differential ring gear 12, and the axle 3 inserted into the axle case 1 from both sides of the insertion hole 12a.
The butted portion at the end of the L / 3R is inserted.

Also, the insertion hole 1 of the differential ring gear 12
On the outer side of 2a, substantially square fitting holes 12b and 12b are opened at symmetrical positions, and a differential pinion shaft 13 rotatably supporting a differential pinion 14 is inserted into the fitting hole 12b in a direction perpendicular to the axle 3. I have. However, the differential pinion shaft 13 and the differential pinion 14 may be integrally formed so as to rotatably support the differential pinion shaft 13 in the fitting hole 12b. In addition, fitting hole 1
2b is two places, but may be arranged more.

On the other hand, the axles 3L and 3R are
Axles 3L and 3L
The butted portion of the inner end of R is inserted into the insertion hole 12a, and the differential side gears 17L and 17R are spline-fitted on the axles 3L and 3R via the rings 16 and 16 on the outside thereof, and the differential side gears 17L and 17R and The differential pinions 14 are constituted by bevel gears and mesh with each other. The outside of the differential side gear 17L is supported by the axle case 1 so as not to be displaced by a retaining ring 19, a contact ring 21 and a bush 15, and the outside of the differential side gear 17R is a collar 20 and a retaining ring 19 and a contact ring outside the collar 20. The bush 15 is supported by the axle case 1 so that the bush 15 does not shift. Thus, the differential gear device is configured.

The differential gear device is provided with a differential lock mechanism. A collar 20 is externally fitted on the axle 3R on the side of the differential side gear 17R, and a slider constituting a sliding member on the outer periphery of the collar 20 is provided. 22 are rotatably fitted. A groove 22 is formed on the outer periphery of the slider 22.
The slide fork (not shown) is fitted into the groove 22a, and the slide fork is connected to a differential lock operating tool provided outside the axle case. A protrusion (diff lock pin) 23 is provided on the inner surface of the slider 22.
23 are extended to the differential side gear 17R side in parallel with the longitudinal direction of the axle 3 and are fixed to the differential side gear 17R. Through holes 17a having a diameter slightly larger than the differential lock pin 23 are formed in the differential side gear 17R in accordance with the projecting position. This through-hole 1 is opened
The differential lock pin 23 is inserted into 7a. Further, a differential lock pin 23 is provided on a side surface of the differential ring gear 12.
Fitting recesses (or through holes) 12c, 12c... Are formed on the same radius in accordance with the projecting position and size of
The distance in the radial direction is made as short as possible, the position where the force is applied is close to the axis, and the slider 22 is made as small as possible. In addition, the number of fitting recesses is not limited.

Therefore, by operating the differential lock operating tool to slide the slider 22, and inserting the differential lock pin 23 into the fitting recess 12c, the differential side gear 17
Since the R and the differential ring gear 12 rotate integrally, no rotation occurs between the differential side gear 17R and the differential pinion 14, and the left and right axles 3L and 3R rotate integrally to form a differential lock state. it can.

Next, a second embodiment of the differential ring gear 12 will be described. The components constituting the differential gear device other than the differential ring gear 12 are the same as those in the first embodiment, and the same components are given the same reference numerals and their description is omitted. As shown in FIGS. 3, 4, and 5, the differential ring gear 12 'is provided with a rectangular concave portion 12e at the center of the side surface facing the differential side gear 17R, and a rectangular side plate 24 corresponding to the concave portion 12e. Can be fitted. That is, the depth of the concave portion 12e and the thickness of the side plate 24 are substantially the same and have the same shape, so that the fitting and fixing can be performed without the need for bolts and screws. The shapes of the concave portion 12e and the side plate 24 are not limited, and the side plate 24 is fitted into the concave portion 12e, and the differential lock pin 23 is fitted into the concave portion 24a.
A hexagonal shape, an octagonal shape, a gear shape, or the like may be used as long as it does not rotate with the rotation of the axle 3 in the state of the differential lock inserted in the vehicle.

The side plate 24 is formed of a sintered member or a steel plate to reduce the manufacturing cost, and an insertion hole 24b is formed at the center of the side plate 24 in accordance with the position and size of the insertion hole 12a. On the outer side surface, fitting recesses (or through holes) 24a, 24a,.
Are provided on the same radius in accordance with the position of the differential lock pin 23. When the side plate 24 formed as a separate member is fitted into the differential ring gear 12 and the differential lock operating tool is operated to slide the slider 22,
As described above, the differential lock can be performed by inserting the differential lock pin 23 into the fitting recess 24a.

[0015]

As described above, the present invention has the following advantages. That is, since the configuration is as described in the first aspect, the configuration is simpler than that of the conventional differential ring gear, and it is possible to easily manufacture and reduce the cost. Also, compared to a conventional differential gear device with a differential lock device without a differential case, the differential gear device can be housed in a small space, can be configured compactly, and cost reduction can be achieved.

Further, since the side plate is formed as a separate part, the abrasion resistance is improved and the side plate can be formed of a member which can be easily manufactured. When the differential lock device is not equipped, the same differential ring can be used. Gears can be used to reduce weight.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a differential gear device having a differential lock mechanism according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a sectional view of a second embodiment of the differential ring gear of the differential gear device.

FIG. 4 is a side view of the same.

FIG. 5 is an exploded perspective view of the same.

[Explanation of symbols]

 3L / 3R axle 12 differential ring gear 12b fitting hole 12c fitting recess 14 differential pinion 17 differential side gear 22 slider 23 differential lock pin 24 side plate 24a fitting recess

Claims (2)

[Claims] 1. A differential case comprising: a pair of axles; a differential ring gear; a differential pinion inserted into an insertion hole provided in the differential ring gear; and a differential side gear provided on both sides of the differential ring gear and meshing with the differential pinion. A differential gear device not having the same, wherein a plurality of fitting concave portions are provided on one side surface of the differential ring gear, and a sliding member having a convex portion extending in a longitudinal direction is arranged opposite to the fitting concave portion; A convex portion of the differential gear engages with the fitting concave portion through a through hole provided in the differential side gear. 2. The differential gear device according to claim 1,
A differential gear device, wherein a fitting concave portion with which the convex portion of the sliding member is engaged is provided on a member formed separately from the differential ring gear.