JP3069239B2 - Oil seal device for differential input shaft support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a differential input shaft supporting portion for supporting a differential input shaft used in an automobile or the like,
The present invention relates to an improvement in an oil seal device that seals oil to be filled to smooth the rotation of the input shaft.

[0002]

2. Description of the Related Art A differential (differential device) used in automobiles and the like.
Generally, as shown in FIG.
A ring gear 44 disposed in the carrier case 20 and fixedly attached to the differential case left 42a;
The input shaft 14 is rotatably supported by the carrier case 20, and has a pinion 46 at the tip end that meshes with the ring gear 44. The differential case 42 is composed of a differential case left 42a and a differential case light 42b which is coupled to the differential case left 42a by a bolt 42c and houses a differential mechanism, and the ring gear 44 is held by the differential case 42 with bolts 44a. A spider 50 having four differential pinions 48 rotatably fitted to a shaft extending in a cross shape is provided in the differential case light 42b.
And two side gears 52 that mesh with the differential pinion 48. Left and right axle shafts (not shown) are spline-coupled to the side gears 52.

The input shaft 14 is connected to a propeller shaft 16 via a universal joint flange 18 as shown in FIG. 6, and the rotational force of the propeller shaft 16 is transmitted to rotate the input shaft 14. When the input shaft 14 having the pinion 46 at its tip is rotationally driven in this manner, the differential case 42 to which the ring gear 44 meshing with the pinion 46 is fixedly attached, and the side gear 52 disposed in the differential case 42 are not shown. The side gear 52 rotates integrally with the axis of the axle shaft, and rotates around the axis of the axle shaft (not shown) without rotation of the differential pinion 48 during straight traveling of the vehicle, so that the side gear 52 rotates. The coupled left and right axle shafts (not shown) rotate at a constant speed. On the other hand, when the rotation direction of the left and right wheels changes due to the change of the traveling direction of the vehicle, the differential rotation of the differential pinion 48 adjusts this difference in rotation speed to prevent the tire from slipping.

In such a differential, the input shaft 14
The differential input shaft support 12 that rotatably supports the differential input shaft on the carrier case 20 will be described in detail. The differential input shaft support 12 is fixedly mounted on the carrier case 20 as shown in FIGS. Bearing cage 2
2 and a bearing 24 supported by the bearing cage 22.
a, the outer race 26 of the bearing 24 is press-fitted into the inner race surface 28a of the inner race 28.
And the input shaft 14 is rotatably supported via a bearing 24.

[0005] In the carrier case 20 of the differential input shaft support portion 12, in order to smoothly rotate the input shaft 14,
Oil is filled. In this case, in order to prevent the oil from leaking, an oil seal device 10 including an oil seal 30 having a lip portion 34 pressed against the universal joint flange 18 is provided as shown in FIG.

In a general oil seal device 10, when the bearing 24 is removed to disassemble the differential input shaft support portion 12 for the purpose of repair and inspection, the bearing 2 is removed.
4 makes contact with the oil seal 30 and particularly damages the lip 34 thereof, making it impossible to reuse the oil seal 30. At the time of reassembly, the oil seal 30 must be replaced. There were things that did not work.

[0007]

Accordingly, in such an oil seal device 10, the differential input shaft support portion 12 is provided.
Alternatively, in order to prevent the bearing 24 from contacting the oil seal 30 to damage the lip portion 34 when disassembling and reassembling the differential, and to enable the oil seal 30 to be reused, as shown in FIG. Preferably, a protective plate 36 is provided.

The protection plate 36 is disposed between the bearing 24 and the oil seal 30 as shown in FIG. 4, and as shown in FIG. 5, when viewed from the propeller shaft side, the input shaft 14 and the universal joint It has a substantially ring-like shape arranged concentrically with the flange 18. As shown in FIG. 5, in the general protection plate 36, the inner diameter d ₁ (see FIG. 5) of the inner peripheral edge 36a of the protection plate 36 is larger than the outer diameter d ₂ (see FIG. 5) of the inner race 28 of the bearing 24. When the differential 24 is disassembled, the inner race 28 of the bearing 24 cannot be removed.
Is formed so as to abut this protection plate 36. Therefore, as shown in FIG. 4, the protection plate 36 can prevent the bearing 24 from contacting the oil seal 30 to damage the lip 34 in particular, and
The oil seal 30 can be extracted at the same time as the bearing 24 is extracted, and the efficiency of the differential disassembly operation is improved.

However, the protection plate 36 of this general shape is used.
The inner race 28 of the bearing 24 is
Because the inner diameter d ₁ (see FIG. 5) of the inner peripheral edge 36a of the protection plate 36 is small, the gap between the protection plate 36 and the universal joint flange 18 is reduced as shown in FIGS. 4 (see FIGS. 4 and 5), the circulation of oil between the oil seal 30 and the bearing 24 with the protective plate 36 interposed therebetween is stagnant, and the local area around the lip 34 is limited. Oil temperature rises and lip 3
There is a problem that the durability of No. 4 decreases. On the other hand, oil temperature rise can be suppressed without the protection plate 36. However, in this case, as described above, when the differential is disassembled, the bearing 24
May come into contact with the oil seal 30 and damage the oil seal 30.

An object of the present invention is to avoid the above problems,
Prevents the bearing from contacting the oil seal and damaging its lip during disassembly, ensuring reuse of the oil seal.At the same time, removing the oil seal together with the bearing to ensure the efficiency of the disassembly work and ensure the circulation of oil. An object of the present invention is to provide an oil seal device for a differential input shaft support portion that can be easily made to suppress a local increase in oil temperature and improve the durability of an oil seal.

[0011]

According to the present invention, an input shaft connected to a propeller shaft via a universal joint flange is rotatably supported on a carrier case via a bearing as a means for solving the above-mentioned problems. In a differential input shaft support portion oil seal device having an oil seal provided in pressure contact with a universal joint flange of a differential input shaft support portion to seal oil in a carrier case, the differential input shaft support portion is disposed between an oil seal and a bearing. A substantially ring-shaped protection plate for protecting the oil seal from the bearing is provided, the protection plate has an inner peripheral edge located outside the outer peripheral surface of the inner race of the bearing, and the bearing is provided when the differential input shaft support is disassembled. Has a contact part formed by recessing the bearing side so that the retainer of the There is provided a preparative oil seal device of the differential input shaft supporting portion, characterized in.

[0012]

As described above, when the protective plate having the contact portion is provided, and the inner peripheral edge of the protective plate is formed outside the outer peripheral surface of the inner race of the bearing, the protective plate can be used when the differential is disassembled. The bearing can be prevented from contacting the oil seal by contacting the cage of the extracted bearing, and at the same time the oil seal can be extracted together with the bearing, while the distance between the protection plate and the universal joint flange is large. Therefore, a sufficient oil circulation space is ensured and the oil easily circulates, so that a local increase in the oil temperature around the lip can be suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a differential input shaft support 12 provided with an oil seal device 10 of the present invention.
2, a universal joint flange 18 for connecting the input shaft 14 to the propeller shaft 16, a bearing cage 22 fixedly attached to a carrier case 20, and a bearing cage 22 as shown in FIGS.
And a bearing 24 such as a roller bearing that is supported by the motor.

As shown in FIG. 2, the differential input shaft support portion 12 press-fits the outer race 26 of the bearing 24 into the inner surface 22a of the bearing cage 22, and inserts the input shaft 14 into the inner peripheral surface 28a of the inner race 28. 1 and 2, the input shaft 14 connected to the propeller shaft 16 via the universal joint flange 18 is rotatably supported on the carrier case 20 via the bearing 24. Is done.

As shown in FIG. 2, the oil seal device 10 includes an oil seal 30 provided in pressure contact with the universal joint flange 18 of the differential input shaft support portion 12;
An oil seal support member 32 is provided between the bearing cage 22 and the oil seal 30 to support the oil seal 30. This oil seal 30
As shown in FIG. 2, the lip portion 34 has an outer peripheral surface 1 of the universal joint flange 18.
8 a to seal the oil in the carrier case 20.

The oil seal device 10 is similar to that shown in FIG.
As shown in FIG. 3, a protection plate 36 is provided between the oil seal 30 and the bearing 24 to protect the oil seal 30.

As shown in FIG. 3, the protection plate 36 is provided on the input shaft 14 when viewed from the propeller shaft 16 side.
And a substantially ring-shaped shape arranged concentrically with the universal joint flange 18.

The protection plate 36 is provided with a bearing 24.
The inner race 28 has an inner peripheral edge 36a located outside the outer peripheral surface 28b . Specifically, the inner diameter d ₁ of the inner peripheral edge 36a of the protection plate 36 having a ring shape (FIG. 3)
As shown in FIG. 3, the outer diameter d ₂ (see FIG. 3) of the inner race 28 of the bearing 24 is formed to be larger than that of the universal joint flange 1.
The size of the inner peripheral edge 36a of the protective plate 36 is set such that the interval t (see FIGS. 2 and 3) between the inner peripheral edge 36a of the protective plate 36 and the inner peripheral edge 36a of the protective plate 36 is large enough to ensure the circulation of oil. To decide. That is, the protection plate 36 used in the present invention is formed by the inner peripheral edge 36a of the general protection plate 36 shown in FIGS.
8 (see FIGS. 4 and 5).

For this reason, the oil in the carrier case 20 flows between the bearing 24 and the oil seal 30 with the protective plate 36 interposed therebetween, and the gap t between the protective plate 36 and the universal joint flange 18 (FIG. 2). and see FIG. 3) it is possible to easily circulate through <br/> the can oil without staying in the peripheral lip portion 34, to suppress the local increase in the oil temperature in the peripheral lip portion 34 .

Further, in the present invention, the protective plate 36 is
As shown in FIG. 2, the differential input shaft support portion 12 has a contact portion 40 formed by recessing the bearing 24 so that the retainer 38 of the bearing 24 contacts when the differential input shaft support portion 12 is disassembled.

For this reason, as shown in FIG. 2, when the bearing 24 is to be removed when the differential is disassembled, the retainer 38 of the bearing 24 comes into contact with the protection plate 36. Therefore, as shown in FIG. 2, before the inner race 28 of the bearing 24 contacts the oil seal 30,
8 comes into contact with the protective plate 36 to prevent the bearing 24 from contacting the oil seal 30 to damage the lip 34 in particular, and at the same time the bearing 24 is removed, the oil seal 30 is also removed. And the efficiency of the differential disassembly operation is improved.

That is, the general holding plate 36 shown in FIG.
In contrast to the above, the inner race 28 of the bearing 24 is abutted, but in the present invention, as described above, the inner peripheral edge 36a of the protection plate 36 is connected to the inner race of the bearing 24 in order to secure a sufficient oil circulation. Since the inner race 28 is formed so as to be located outside the outer peripheral surface 28b of the race 28, the inner race 28 does not come into contact with the protective plate 36, and instead of ensuring sufficient oil circulation, the retainer 38 of the bearing 24 is replaced with a protective plate. 36 to protect the oil seal 30.

[0023]

According to the present invention, as described above, a protective plate having a contact portion is provided between the oil seal of the differential input shaft support portion and the bearing, and the inner peripheral edge of the protective plate is provided on the inner periphery of the bearing. Since it is formed so as to be located outside the outer peripheral surface of the race, the contact part of the protective plate contacts the retainer of the bearing that was removed when the differential is disassembled, etc., so that the bearing contacts the oil seal. The oil seal can be reused by preventing the oil seal, and at the same time, the oil seal can be extracted together with the bearing, so that there is a real benefit that the efficiency of the disassembling operation is improved. In addition, since the space between the protection plate and the universal joint flange is increased, a sufficient oil circulation space is secured, and the oil is easily circulated. There is a real benefit that the durability of the seal can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a differential input shaft support provided with an oil seal device of the present invention.

FIG. 2 is a sectional view of a main part of the oil seal device of the present invention.

FIG. 3 is a schematic plan view showing an attached state of a protection plate used in the present invention.

FIG. 4 is a sectional view of a main part of an oil seal device of a comparative example to which a protection plate is attached.

FIG. 5 is a schematic plan view showing an attached state of a protection plate used in the comparative example shown in FIG.

FIG. 6 is a cross-sectional view of a general differential input support unit.

FIG. 7 is a schematic exploded perspective view of a general differential.

[Explanation of symbols]

Reference Signs List 10 oil seal device 12 differential input shaft support part 14 input shaft 16 propeller shaft 18 universal joint flange 20 carrier case 22 bearing cage 22a inner surface of bearing cage 24 bearing 26 outer race 28 inner race 28a inner peripheral surface 28b of inner race Outer peripheral surface 30 Oil seal 32 Oil seal support member 34 Lip portion 36 Protective plate 36a Inner peripheral edge of protective plate 38 Bearing retainer 40 Contact portion 42 Differential case 42a Differential case left 42b Differential case right 42c Bolt 44 Ring gear 44a Bolt 46 Pinion 48 Diffpinion 50 Spider 52 Side gear

Claims (1)

(57) [Claims] An input shaft connected to a propeller shaft via a universal joint flange is rotatably supported on a carrier case via a bearing. The input shaft is provided in pressure contact with the universal joint flange of a differential input shaft support portion. An oil seal device for a differential input shaft supporting portion having an oil seal for sealing oil in a carrier case, a substantially ring-shaped protection plate disposed between the oil seal and the bearing to protect the oil seal from the bearing. Wherein the protection plate has an inner peripheral edge located outside the outer peripheral surface of the inner race of the bearing, and the bearing of the bearing is brought into contact with the differential input shaft support when the differential input shaft support is disassembled. A differential input having a contact portion formed by indenting the side. Oil seal device for shaft support.