JP2511265Y2 - Differential device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diff device for a vehicle.

[0002]

2. Description of the Related Art An example of a conventional differential device is shown in FIG. In this figure, a differential case 2 that rotatably supports an input shaft 1 extending left and right in the figure, and a closed space 3 that is assembled to the differential case 2 and that extends in a direction orthogonal to the paper surface of the figure are shown. An axle housing 4 that rotatably supports the output shaft on both sides, a reduction gear 6 that rotates while being immersed in oil 5 that accumulates in the lower part of the closed space 3 and is connected to the output shaft, and a propeller (not shown). A reduction pinion 8 that is attached to the other end of the input shaft 1 that is connected to the shaft via a joint 7 and that meshes with the reduction gear 6, a bearing retainer 9 that is attached to the differential case 2, a bearing retainer 9, and the input shaft 1. The differential device is composed of a pair of bearings, that is, an outer bearing 10 and an inner bearing 11, which are interposed between the bearings and are spaced from each other. Have been. By the way, in order to supply oil to the bearings 10 and 11, an oil hole 12 is formed in the upper inner surface of the differential case 2 as shown in the drawing, and the oil passage 12 is communicated with an oil hole 12a formed in the bearing retainer. The splash oil generated in the closed space 3 is guided into the bearing retainer 9. In this case, since the first opening 13 of the oil passage 12 indicates the rotation direction of the reduction gear 6 when the vehicle is moving forward as indicated by the arrow F, the first opening 13 faces in the same direction so as to easily accept the splash oil flying in the same direction. It is opened to. The oil flowing down from the oil hole 12a through the second opening 21 lubricates the bearings 10 and 11, and the surplus oil is returned to the closed space 3 through the oil return hole 14 penetrating from the lower part of the bearing retainer 9 to the lower part of the differential case. .

[0003]

FIG. 3 shows a conventional bearing retainer 9, and the bearing retainer 9 has a flange portion 15 for mounting on a differential case (not shown).
An inner large diameter portion 17 into which the outer race 16 of the inner bearing 11 is fitted, an outer large diameter portion 19 into which the outer race 18 of the outer bearing 10 is fitted, and large diameter portions 17 and 1
It is composed of a small-diameter portion 20 sandwiched between the two. Oil hole 1
2a is penetrated from the inner peripheral surface of the small diameter portion 20 to the outer periphery of the inner large diameter portion 17. Since the inner peripheral surface of the small-diameter portion 20 is formed to have a larger diameter than the shoulder portions of the left and right outer races 16 and 18, the oil supply amount is small when the vehicle is traveling at a low speed. There is a problem that oil is not supplied beyond the bearing rolling surface and is returned to the closed space 3 through the oil return hole 14 in the lower part, resulting in poor lubrication of the bearing. Therefore, in order to solve this problem, the inner surface of the small diameter part should be formed with a small diameter so that it protrudes from the shoulders of both bearing outer races. Problem occurs.

Therefore, an object of the present invention is to provide a diff device capable of ensuring good lubrication of the bearing rolling surface even during low speed running.

[0005]

SUMMARY OF THE INVENTION A diff device of the present invention is a small diameter portion of a bearing retainer, at a position where oil flows down from a second opening portion, protruding from a pair of bearing outer races and axially extending to both sides. A bearing retainer having a projection formed with a guide portion for guiding the flow to be distributed is provided.

[0006]

[Operation] When the oil that has entered the bearing retainer flows down through the recess between the left and right bearing outer races, the projection serves as a weir to temporarily block the oil and store it on the upstream side of the projection until it eventually overflows. As a result, the shoulder portion of the outer race is passed over, the bearing is guided by the bearing rolling surface to lubricate it, and the guide portion divides the flow evenly in the left and right directions.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

In FIG. 1, parts which are the same as or equivalent to those of the conventional example are denoted by the same reference numerals and the description thereof is omitted. In this case, the second opening portion 21 is located at a position slightly displaced from the uppermost portion in the mounted state of the bearing retainer 90, and the oil always flows through the small diameter portion 30 on the second opening portion 21 side, Protrusions 31 are formed at appropriate positions on the way of the oil flow. The protrusion 31 has a small diameter portion 3 in the axial direction.
It has the same width as 0, and as shown in FIG.
The height of the protrusion 31 is the bearing outer race 1 on the left and right in the figure.
It projects from the shoulders of 6,18. Further, as shown in (a) of the figure, on the oil upstream side of the protrusion 31, that is, on the side of the second opening portion 21, there is provided a guide portion, that is, a distribution slope 32 that forms a mountain shape to the left and right from the widthwise center of the small diameter portion 30. It is formed so that the oil, which is blocked by the protrusions 31 and overflows, is evenly distributed to the left and right bearings. The mountain-shaped slope of the guide portion may be replaced with an arc-shaped curved surface.

When the second opening 21 is formed at the uppermost position in the bearing retainer mounted state, the protrusions 31 may be provided at two positions on the left and right with respect to the vertical surface. In this case, the guide portion 32 is, of course, provided upstream in the direction of oil flow during forward movement.

[0010]

As described above, according to the present invention, there is almost no increase in weight, and it is possible to maintain good bearing lubrication even at low speed running while maintaining the ease of exchanging the outer race as in the conventional case.

[Brief description of drawings]

1] Fig. 1 showing an embodiment of the present invention] (a) is a partially broken enlarged view showing a bearing retainer used in the embodiment of the present invention, (b) is AA in (a) FIG.

FIG. 2 is a sectional view showing an example of a conventional differential device.

FIG. 3A is a partially broken enlarged view showing a main part of a conventional bearing retainer, and FIG. 3B is a side sectional view taken along line BB in FIG. 3A.

[Explanation of symbols]

 1 ... Input shaft 2 ... Differential case 3 ... Closed space 4 ... Axle housing 6 ... Reduction gear 8 ... Reduction pinion 90 ... Bearing retainer 10, 11 ... Pair of bearings 12 ... Oil passage 13 ... 1st opening part 30 ... Small diameter part 21 ... 2nd opening part 31 ... Protrusion 32 ... Guide part

Claims (1)

(57) [Scope of utility model registration request] 1. A differential case for rotatably supporting an input shaft, and a closed space formed in cooperation with the differential case,
An axle housing that rotatably supports output shafts that extend on both sides in a direction orthogonal to the input shaft, and a reduction gear that is connected to the output shaft and that rotates while being immersed in oil stored in the closed space. , A reduction pinion that is attached to the other end of the input shaft that is connected to the propeller shaft via a joint, and that meshes with the reduction gear, and a pair of spaced bearings that are attached to the differential case. The bearing retainer that rotatably supports the input shaft and the first opening that is provided in the upper portion of the differential case so as to face the direction of rotation of the reduction gear when moving forward are sandwiched between the pair of bearing outer races that are the upper portion of the bearing retainer. A differential device having an oil hole reaching a second opening facing a small diameter portion, At the position where the oil flows down from the second opening in the small diameter portion of the grinder, the width is approximately the same as the width of the small diameter portion, and the height is such that it projects from the pair of bearing outer races, and both sides in the axial direction. A diff device characterized by comprising a projection having a guide portion that guides the flow to the branch.