JPH1148806A - Oil lubrication structure of differential mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil lubrication structure of a differential mechanism capable of reducing manufacturing cost, by suppressing the increase of the number of part items. SOLUTION: In an oil lubrication structure of a differential mechanism, a journal part 9 for journaling an output shaft 7 is formed in a differential gear box and the differential bear box 20 is provided with a ball bearing 22 provided in a bearing-accomodating recessed part 23 turnably supporting the differential gear box 20. An oil receiving rib 25 for receiving lubrication oil scattering around differential gears due to turning motion of the differential gears and a guide rib 26 connected to the oil receiving rib 25 and guiding the lubrication oil toward the ball bearing 22 are formed around the bearing- accomodating recessed part 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission applied to, for example, an automobile, and more particularly to a lubrication system for bearings of a differential gear.

[0002]

2. Description of the Related Art As a conventional oil lubrication structure for a differential mechanism of this type, there is known an oil lubrication structure used in an automatic transmission 1 of an automobile as shown in FIG.
3-27595 and the like).

[0003] In such a device, a differential gear box 2 rotatably provided in an automatic transmission housing 1 comprises:
A small gear shaft 3 fixed to the center of the gear box main body 2a with a pin, a pair of differential small gears 4 and 4 rotatably supported by the small gear shaft 3, and A pair of differential gearwheels 5 and 5 that mesh with each other;
And output shafts 6 and 7 each serving as a differential gear rotating unit connected to the motor.

In the gear box main body 2a, support shafts 8, 9 projecting to the left and right sides in the figure are supported by a differential housing 13 of a transmission case 12 via tapered roller bearings 10, 11. Have been.

The support shafts 8 and 9 have shaft holes 8a and 9
a, and the output shafts 6, 7 are inserted into the shaft holes 8a, 9a so as to be rotatable.

The differential housing 13 has an outlet end 15a between an oil seal member 14 and the tapered roller bearings 10, 11.
Is formed.

[0007] One end 16a of a pipe-shaped gutter member 16 is connected to the other end 15b of the oil communication passage 15 on the inlet side. The other end 16b of the gutter member 16 is fitted with a plug 16c with an orifice, and is connected to an outlet 17a of an oil passage 17 formed in the differential housing 13.

The gear box body 20a has
The input large gear 18 meshing with the output shaft provided in the automatic transmission housing 100 is provided so as to be integrated.

Next, the operation of this conventional example will be described.

In this conventional example, lubricating oil supplied from a hydraulic control device (not shown) is supplied to the oil passage 17 via an oil passage formed in the transmission case 12.

The lubricating oil supplied to the oil passage 17 is supplied to the space 19 between the oil seal member 14 and the tapered roller bearing 11 via the gutter member 16 and the oil communication passage 15.

The lubricating oil is supplied to the tapered roller bearing 11 and a sliding portion in the vicinity thereof,
The differential gear box 2 is configured to be forcibly lubricated.

[0013]

However, in such a conventional device, the differential housing portion 1 is not provided.
An oil passage 17 and an oil communication passage 15 formed in 3 are connected by a pipe-shaped gutter member 16.

Therefore, there is a problem that the number of components including the gutter member 16, a clip for supporting and fixing the gutter member 16 and fixing members such as bolts is increased, and the manufacturing cost is increased.

It is an object of the present invention to provide an oil lubrication structure for a differential mechanism that can suppress an increase in the number of parts and reduce manufacturing costs.

[0016]

According to a first aspect of the present invention, there is provided a differential gear box in which a support shaft portion for supporting a differential gear rotating portion is supported. A differential housing for accommodating the differential gear box; and a bearing housing recess formed in the differential housing for rotatably supporting the differential gear box in the bearing housing recess. An oil lubrication structure of a differential mechanism provided with a bearing member, wherein the differential housing is provided on the periphery of the bearing receiving recess by rotation of the differential gear box. Forming an oil receiving rib for receiving the lubricating oil scattered around the box and a guide rib connected to the oil receiving rib and guiding the lubricating oil toward the bearing member; It is characterized in lubricating structure of that differential Allen Shall mechanism.

According to the first aspect of the present invention, when the differential gear box rotates, the oil is scattered around the differential gear by the oil receiving rib formed around the bearing receiving recess. Lubricating oil is received.

Then, the guide rib connected to the oil receiving rib guides the received lubricating oil toward the bearing member. The bearing member is sufficiently lubricated by the guided lubricating oil.

For this reason, the number of components such as the conventionally used pipe-shaped gutter member, clips and bolts for supporting and fixing the gutter member can be reduced, and an increase in manufacturing cost can be suppressed.

According to a second aspect of the present invention, the oil receiving rib extends substantially vertically above a center of rotation of the differential gear rotating portion. Item 1 is characterized by an oil lubrication structure of the differential mechanism described in Item 1.

According to the second aspect of the present invention, the oil receiving rib extends in a substantially horizontal direction vertically above a rotation center of the differential gear rotating portion. The lubricating oil scattered vertically upward from the center of rotation of the differential gear rotating portion can be received and collected in a wide range.

Therefore, lubrication efficiency is good.

According to the third aspect,
The oil lubrication of a differential mechanism according to claim 1 or 2, wherein the guide rib extends vertically downward from a terminal edge of the oil receiving rib toward a rotation center of the differential gear rotation portion. It is characterized by its structure.

According to the third aspect of the present invention, the guide rib extends vertically downward from a terminal edge of the oil receiving rib toward a rotation center of the differential gear rotation portion. Have been.

For this reason, the lubricating oil received by the oil receiving rib is guided smoothly by flowing down the guide rib toward the bearing member. Therefore, the lubrication efficiency is further improved.

[0026]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. The same or equivalent parts as those in the conventional example are denoted by the same reference numerals and described.

FIGS. 1 to 3 show a first embodiment of the present invention.
1 shows an oil lubrication structure of the differential mechanism of FIG.

First, the structure of the first embodiment will be described. A differential gear box 20 is provided in an automatic transmission housing 100 so as to be rotatable.

The differential gear box 20 has a small gear shaft 3 fixed at the center of a gear box body 20a with a pin 3a.
A pair of differential small gears 4 and 4 rotatably supported by the small gear shaft 3; a pair of differential large gears 5 and 5 meshing with the differential small gears 4 and 4; It mainly comprises output shafts 6 and 7 as differential gear rotating parts connected to the large gears 5 and 5, respectively.

In the gear box body 20a, support shafts 8, 9 protruding to the left and right sides in the drawing have ball bearings 10, 11 as bearing members, and differential gears of the automatic transmission housing 100 are provided. Housing part 1
3 and is supported by being pivotally attached to the bearing accommodating recesses 23 formed therein.

The support shafts 8 and 9 have shaft holes 8a and 9
a is formed, and the output shafts 6, 7 are disposed in the shaft holes 8a, 9a so as to be rotatable.

Oil seal members 14, 14 are interposed between shaft openings 13a, 13a formed in the differential housing portion 13 and the output shafts 6, 7, respectively. Leakage of the lubricating oil from the char housing portion 13 to the outside is prevented. The oil seal member 14 is configured such that a metal rubber core 14a is covered with a rubber rubber lip portion 14b to form a ring.

The gear box body 20a includes:
A washer 18b is interposed in a bolt 18a so that an input gear 18 meshing with an output shaft provided in the automatic transmission housing 100 is integrated.
8d is screwed into the female screw portion 18c.

A speed gear 24 is fixedly attached to the outer peripheral surface of the gear box main body 20a from the substantially central portion to the output shaft 7, and is configured to rotate integrally with the gear box main body 20a. I have.

The inner peripheral surface of the differential housing portion 13 around the gear box main body 20a is
The rotation of the differential gear box 20 as shown in FIG.
An oil receiving rib 25 for receiving lubricating oil scattered around the differential gear is formed.

The oil receiving rib 25 extends from a position vertically above the speed gear 24 in a substantially horizontal direction toward the outer peripheral surface.

The oil bearing rib 25 is provided on the inner peripheral surface of the differential housing portion 13 around the gear box body 20a.
Guide ribs 26 for guiding these lubricating oils in the direction are formed.

As shown in FIG. 1, the guide rib 26 is formed to be inclined at a constant angle along the inclination of the outer peripheral surface 20b of the gear box extending from the small gear shaft 3 to the ball bearing 22.

The guide rib 26 extends vertically downward from the terminal end edge 25a of the oil receiving rib 25 toward the rotation center O of the differential gear rotating portion, whereby the oil receiving rib 25 is provided. As shown in FIG. 3, the ribs 25 are integrally formed with the ribs 25 so that the side surface in the axial direction has a substantially rectangular shape.

A notch 23a for introducing lubricating oil flowing along the guide rib 26 is formed at a part of the circumference of the bearing accommodating recess 23 at a position vertically above the center of rotation of the ball bearing 22. Have been.

Further, in the first embodiment, the ball bearing 22 is provided between the rear side 22a of the ball bearing 22 and the differential housing portion.
Bearing case 22 in which the ball body 22b is disposed
An oil sump recess 27 communicating with the inside of c is formed.

Next, the operation of the first embodiment will be described.

In the first embodiment, the oil receiving ribs 25 formed around the gear box main body 20a allow each part of the operating gear box 20, for example, the differential small gear 4, or the differential large gear 4. Lubricating oil scattered around the differential gear is received by the rotation of the gear 5 and the like.

Then, the received lubricating oil flows down toward the ball bearing 22 as shown by a white arrow in FIG. 3 by the guide rib 26 connected to the oil receiving rib 25. Therefore, the ball bearing 22 is sufficiently lubricated by the lubricating oil that has been guided.

Therefore, even if the supporting portions 8 and 9 are subjected to a high load by supporting the output shafts 6 and 7,
The number of components such as the conventionally used pipe-shaped gutter member 16, clips and bolts for supporting and fixing the gutter member 16 is reduced, and the increase in the manufacturing cost is suppressed, and the differential gear box 20 is smoothly formed. The pivoting portion can be pivotally supported.

Since the oil receiving rib 25 extends substantially vertically above the center O of rotation of the differential gear rotating portion, the oil receiving rib 25 extends in the horizontal direction. The lubricating oil scattered vertically upward by the speed gear 24 or the like can be received and collected in a wide range from the rotation center O of the rotation part. Therefore, the lubrication efficiency is good.

The guide rib 26 extends vertically downward from the terminal edge 25a of the oil receiving rib 25 toward the rotation center O of the differential gear rotating portion.

Therefore, as shown by a white arrow in FIG. 1, the lubricating oil received by the oil receiving rib 25 is
The guide rib 26 smoothly flows down the guide member 26 toward the bearing member via the cutout portion 23a.

The lubricating oil introduced into the notch 23a is
The oil is temporarily stored in the oil sump recess 27. The output shaft 7
Since the oil seal member 14 seals the space between the shaft opening 13 and the shaft opening 13, the lubricating oil does not leak out of the differential housing 13.
Circulated internally.

Then, the lubricating oil once stored in the oil sump recess 27 is guided into the bearing case 22c of the ball bearing 22, and the ball body 22b as a sliding portion is always lubricated by the lubricating oil. As a result, lubrication efficiency is further improved.

Although the first embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to the first embodiment, and there are design changes and the like within the scope of the present invention. Even this is included in the present invention.

For example, in the first embodiment, the lubricating oil is guided from the oil reservoir recess 27 formed on the back surface 22a of the ball bearing 22 to the bearing case 22c provided with the ball body 22b. However, the invention is not limited to this. For example, the lubricating oil may be guided from the surface side of the ball bearing 22 into the bearing case 22c.

In the first embodiment, the automatic transmission housing 100 is described as being integrally provided. However, the present invention is not limited to this. For example, the automatic transmission housing 100 is independently mounted on the body of an automobile or the like. The configuration of the first embodiment may be applied to a differential mechanism.

In the first embodiment, the ball bearings 10 and 11 are used as bearing members. However, the present invention is not limited to this. For example, thrust bearings, cylindrical rollers, conical rollers, and spherical rollers are used. It goes without saying that any shape, material, and number of bearings such as a tapered roller bearing may be used.

[0055]

As described above, according to the first aspect of the present invention, when the differential gear box rotates, the oil receiving rib formed around the bearing receiving concave portion rotates. Lubricating oil scattered around the differential gear is received.

Then, the guide rib connected to the oil receiving rib guides the received lubricating oil toward the bearing member. The bearing member is sufficiently lubricated by the guided lubricating oil.

For this reason, the number of components such as the conventionally used pipe-shaped gutter member, clips and bolts for supporting and fixing the gutter member can be reduced, and an increase in manufacturing cost can be suppressed.

According to the second aspect of the present invention, the oil receiving rib extends substantially vertically above the center of rotation of the differential gear rotating portion. The lubricating oil scattered vertically upward from the rotation center of the differential gear rotation portion can be received and collected in a wide range. Therefore, the lubrication efficiency is good.

Further, according to the third aspect,
The guide rib extends vertically downward from a terminal edge of the oil receiving rib toward a rotation center of the differential gear rotation portion.

For this reason, the lubricating oil received by the oil receiving rib is smoothly guided down the guide rib toward the bearing member. Therefore, the lubrication efficiency is further improved, which is a practically useful effect.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a main part illustrating a configuration of an oil lubrication structure of a differential mechanism according to Embodiment 1 of the present invention.

FIG. 2 is a schematic top view illustrating an oil lubrication structure of the differential mechanism according to the first embodiment and illustrating an entire configuration of the automatic transmission.

FIG. 3 is a sectional view showing an oil lubrication structure of the differential mechanism according to the first embodiment, taken along a line AA in FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part illustrating an oil lubrication structure of a differential mechanism of a conventional example.

[Explanation of symbols]

 6, 7 Output shaft (differential gear rotating portion) 8, 9 Support shaft portion 8a, 9a Shaft hole 13 Differential housing 20 Differential gear box 20a Gear box main body 21, 22 Ball bearing (bearing main body) 23, 23 Bearing storage recess (bearing storage recess) 25 Oil receiving rib 26 Guide rib 27 Oil reservoir recess 100 Automatic transmission housing O Rotation center

Claims (3)

[Claims] 1. A differential shaft box for supporting a differential gear rotating portion is formed in a differential gear box, a differential housing for accommodating the differential gear box, and formed in the differential housing. An oil lubrication structure for a differential mechanism, wherein a bearing member is provided in the bearing receiving recess provided so as to rotatably support the differential gear box in the bearing receiving recess. In the housing, by the rotation of the differential gear box, around the periphery of the bearing portion storage recess,
A differential, comprising: an oil receiving rib for receiving lubricating oil scattered around the differential gear box; and a guide rib connected to the oil receiving rib and guiding the lubricating oil toward the bearing member. Oil lubrication structure of the mechanism. 2. The oil receiving rib according to claim 1, wherein the oil receiving rib extends in a substantially horizontal direction vertically above a center of rotation of the differential gear rotating portion. Oil lubrication structure of differential mechanism. 3. The method according to claim 1, wherein the guide rib extends vertically downward from a terminal edge of the oil receiving rib toward a rotation center of the differential gear rotation portion. 2. The oil lubrication structure of the differential mechanism according to 2.