JP3274916B2 - Oil seal lubrication structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal which is mounted on a case and slidably contacts an outer periphery of a rotary shaft rotatably mounted on the case at an inner peripheral lip portion to seal between the case and the rotary shaft. Lubrication structure.

[0002]

2. Description of the Related Art As one of lubrication structures for oil seals,
A rotating shaft projecting out of the case through an oil seal mounting hole provided in the case is rotatably mounted to the case via a bearing mounted in a bearing mounting hole provided in the case, and has a smaller diameter than the bearing. At the peripheral lip portion, an oil seal that slides on the outer periphery of the rotary shaft is attached to an oil seal mounting hole of the case, and an oil receiver that introduces lubricating oil into a space formed between the oil seal and the bearing is provided. There is a case where it is assembled to a case. In this case, the bottom wall of the bearing mounting hole located between the oil seal and the bearing extends vertically from the bearing mounting hole toward the oil seal mounting hole. There is one in which a linear guide rib is integrally formed.

[0003]

In the oil seal lubricating structure described above, when lubricating oil is introduced into the space formed between the oil seal and the bearing by the oil receiver, a part of the lubricating oil is linearly formed. Flows downward or upward along the guide rib, and hits the outer periphery of the rotating shaft. By the way, since the lubricating oil flowing along the linear guide rib hits the outer periphery of the rotary shaft with a linear flow, it is easily scattered outward by centrifugal force and hardly adheres to the outer periphery of the rotary shaft. Therefore, the lubricating oil hardly flows along the outer circumference of the rotating shaft to the inner lip of the oil seal,
The inner lip of the oil seal is not lubricated sufficiently. SUMMARY OF THE INVENTION The present invention has been made to address the above-described problem, and an object of the present invention is to make it easy for lubricating oil to adhere to the outer periphery of a rotating shaft and to sufficiently lubricate the inner peripheral lip portion of an oil seal. And

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotary shaft which is disposed coaxially through an oil seal mounting hole and a bearing mounting hole. An oil seal that is rotatably supported by a bearing attached to the oil seal and that has a smaller diameter than the bearing and slides on the outer periphery of the rotary shaft at an inner peripheral lip portion is attached to the oil seal mounting hole. In an oil seal lubrication structure in which an oil receiver that introduces lubricating oil into a space formed in the case is attached to the inner wall of the case, a bottom wall of the bearing mounting hole located between the oil seal and a bearing is provided. The oil extends in a direction of rotation of the rotary shaft from the bearing mounting hole toward the oil seal mounting hole. Lumpur mounting hole side end portion formed integrally with guide ribs which an arc shape along the same mounting hole, and the linear guide ribs extending upwardly from the bottom of the bearing mounting hole in the oil seal mounting hole Provided,
A linear guide rib extends along the bottom wall of the bearing mounting hole
The flowing lubricating oil toward the outer circumference of the input shaft
An object of the present invention is to provide a lubricating structure for an oil seal characterized by fulfilling a role .

[0005]

Therefore, in the oil seal lubricating structure according to the present invention, a part of the lubricating oil introduced by the oil receiver into the space formed between the oil seal and the bearing moves along the guide rib along the rotating shaft. And flows in the same direction as above and hits the outer periphery of the rotating shaft. By the way, the lubricating oil flowing along the guide ribs has a flow rotating in the same direction as the rotating shaft, and hits the outer periphery of the rotating shaft in synchronism. easy. Therefore,
Lubricating oil easily flows along the outer periphery of the rotating shaft to the inner lip of the oil seal, and the inner lip of the oil seal is sufficiently lubricated. As a result, the temperature of the inner peripheral lip portion of the oil seal can be reduced, and the durability of the oil seal can be improved. In addition, the present invention can be carried out only by changing the mold when the case is manufactured using a mold such as cast iron or die cast, without increasing the number of parts and assembling, increasing the cost, No problems such as assembly failure occur.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a transfer for distributing power to the front and rear wheels of an automobile. An input shaft 11 of the transfer has a bearing 31 mounted in a bearing mounting hole 21 provided in a case 20 and a case 20. Is rotatably mounted on the case 20 via a bearing 32 mounted on the bearing mounting hole 22. Both bearings 31 and 32 are shield bearings, and are configured to allow the flow of the lubricating oil but prevent the inflow of foreign matter.

The input shaft 11 protrudes out of the case 20 at one end through an oil seal mounting hole 23 provided in the case 20. The oil seal mounting hole 23 has a smaller diameter than the bearing 31 and an inner peripheral lip portion 33a. An oil seal 33 that slides on the outer periphery of the input shaft 11 is assembled. Incidentally, on the input shaft 11, input gear 12 and the formic ya 13 have been assembled integrally rotatably, the input gear 12 is power transmission coupled to the output gear (not shown) through the idler gear 14 The lubricating oil injected into the case 20 is diffused by the rotation of each gear.

2 to 4 are provided on the inner wall of the case 20.
As shown in the figure, one end is connected to the bearing mounting hole 21.
A recess 24 is formed to pass through, and a rib 25 extending vertically corresponding to the other end of the recess 24 is formed,
An oil receiver 34 (see FIG. 2) is assembled in accordance with the recess 24 and the rib 25. The oil receiver 34 is for introducing lubricating oil into a space R (see FIG. 1) formed between the oil seal 33 and the bearing 31. As shown in detail in FIGS. 34
A guide wall 34b1 for guiding lubricating oil to the bottom wall 21a side of the bearing mounting hole 21 is formed at the outlet side of the gutter 34b. Have been.

In this embodiment, the bearing mounting hole 2 located between the oil seal 33 and the bearing 31 is provided.
The guide rib 2 shown in detail in FIG.
6, 27 and 28 are integrally formed. The guide rib 26 is a linear guide rib extending upward from the bearing mounting hole 21 toward the oil seal mounting hole 23,
It has a function of flowing lubricating oil flowing along the bottom wall 21 a toward the outer periphery of the input shaft 11. Guide rib 27,
Reference numeral 28 denotes a rotation direction of the input shaft 11 from the bearing mounting hole 21 to the oil seal mounting hole 23 (FIGS. 2 and 3).
The guide ribs are curved in the counterclockwise direction, and the ends of the oil seal mounting holes are arcuate along the mounting holes 23. The guide ribs are formed by lubricating oil flowing along the bottom wall 21a and centrifugal force from the input shaft 11. Disperse the lubricating oil into the input shaft 11
Has the function of flowing toward the outer periphery of the.

In this embodiment constructed as described above, the input gear 1 associated with the rotation of the input shaft 11
2. The rotation of the idler gear 14 and the output gear (not shown) diffuses the lubricating oil injected into the case 20 and flows through the inner wall and the rib 25 of the case 20 into the oil receiver 34, where the oil receiver 34
Is introduced into the space R formed between the oil seal 33 and the bearing 31 at this time, and at this time, the oil receiver 34
The lubricating oil is supplied to the bearing mounting hole 2 by the guide wall 34b1.
Input shaft 1 while being guided toward the bottom wall 21a of the input shaft 1
1 flows toward the outer circumference.

The lubricating oil flowing from the outlet of the oil receiver 34 toward the outer periphery of the input shaft 11 hits the outer periphery of the input shaft 11 and is scattered outward by centrifugal force.
A part thereof adheres to the inner periphery of the guide rib 27, rotates along the rib 27 in the same direction as the input shaft 11, flows and flows from the end of the rib 27 toward the input shaft 11 again, and flows therethrough. Hit the outer circumference of Another part of the lubricating oil scattered from the outer periphery of the input shaft 11 flows in the rotation direction of the input shaft 11 along the bottom wall 21a of the bearing mounting hole 21 and adheres to the inner periphery of the guide rib 28, which is And flows in the same direction as the input shaft 11 along the input shaft 11, and again from the end of the rib 28.
1 and hits the outer periphery of the input shaft 11. Another part of the lubricating oil scattered from the outer periphery of the input shaft 11 flows in the rotation direction of the input shaft 11 along the bottom wall 21a of the bearing mounting hole 21, and the flow direction is changed by the guide rib 26, and The flow from the end 26 toward the input shaft 11 again hits the outer periphery of the input shaft 11.

Incidentally, the lubricating oil flowing along the guide ribs 27 and 28 has a flow rotating in the same direction as the input shaft 11 and strikes the outer periphery of the input shaft 11 in synchronism, so that it is scattered outward by centrifugal force. It is difficult to adhere to the outer periphery of the input shaft 11. Therefore, the lubricating oil easily flows along the outer periphery of the input shaft 11 to the inner peripheral lip 33a of the oil seal 33, and the inner peripheral lip 33a of the oil seal 33 is sufficiently lubricated. As a result, the temperature of the inner peripheral lip 33a of the oil seal 33 can be reduced, and the durability of the oil seal 33 can be improved. In addition, it flows toward the input shaft 11 from each end of both guide ribs 27 and 28, and the input shaft 11
Some of the lubricating oil adhering to the outer periphery of the shaft is also scattered outward due to the centrifugal force of the input shaft 11, but the lubricating oil scattered and adhering to the bottom wall 21 a of the bearing mounting hole 21 will
Due to the above-described actions of 7, 28, the fluid is repeatedly flowed toward the outer periphery of the input shaft 11 and adheres to the outer periphery of the input shaft 11. The surplus lubricating oil in the space R is lubricated by passing through the bearing 31 and then falls toward the bottom of the case 20.

The above embodiment is an example in which the present invention is applied to a lubricating structure of an oil seal employed in an input shaft supporting portion of an automobile transfer. A rotatable shaft protruding out of the case is rotatably mounted to the case via a bearing mounted in a bearing mounting hole provided in the case, and the rotary shaft is smaller in diameter than the bearing and has an inner peripheral lip portion. An oil seal that is slidably contacting the outer periphery is attached to an oil seal mounting hole of the case, and an oil receiver that introduces lubricating oil into a space formed between the oil seal and the bearing is attached to the case. If it is a lubricating structure, it can be carried out in the same manner as in the above embodiment, and the application place of the present invention is limited to the above embodiment. There.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an essential part showing an example of a portion to which the present invention is applied.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a diagram showing a part of the case shown in FIGS. 1 and 2 in detail.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a front view of the oil receiver shown in FIG.

FIG. 6 is a plan view of the same.

FIG. 7 is a side view of the same.

[Explanation of symbols]

11: input shaft (rotary shaft), 20: case,
Reference numeral 21: bearing mounting hole, 21a: bottom wall, 23: oil seal mounting hole, 27, 28: guide rib, 31: bearing, 33: oil seal, 33a: inner peripheral lip portion, 3
4 ... oil receiver, R ... space.

Claims (3)

(57) [Claims] An oil seal mounting hole formed coaxially inside a case and a rotary shaft disposed through a bearing mounting hole, the rotatable shaft being rotatably supported by a bearing mounted in the bearing mounting hole; An oil seal having a diameter smaller than that of the bearing and slidingly contacting the outer periphery of the rotary shaft at an inner lip portion is assembled into the hole, and an oil receiver for introducing lubricating oil into a space formed between the oil seal and the bearing is provided. In a lubricating structure of an oil seal attached to an inner wall of a case, the rotary shaft is provided on a bottom wall of the bearing mounting hole located between the oil seal and a bearing from the bearing mounting hole toward the oil seal mounting hole. The end of the oil seal mounting hole side curved in the direction of rotation of the oil seal has a circular arc shape along the mounting hole. Integrally forming a Doribu,
And a linear guide rib extending upward from a lower portion of the bearing mounting hole toward the oil seal mounting hole.
And the linear guide rib is located at the bottom of the bearing mounting hole.
Direct the lubricating oil flowing along the wall to the outer circumference of the input shaft
A lubricating structure for an oil seal, characterized in that the lubricating structure plays a role of flowing . 2. Lubricating oil is supplied to an outlet side of the oil receiver.
Forming a guide wall for guiding to a bottom wall of the bearing mounting hole;
The oil seal according to claim 1, wherein
Smooth structure. 3. The oil guide system according to claim 1 , wherein
Formed on the left and right sides of the end of the
Form the linear guide rib between the lower ends of the guide ribs.
The oril seal according to claim 1, wherein the seal is formed.
Lubrication structure.