JP2020085212A - Oil seal structure - Google Patents

Abstract

To provide an oil seal structure which enables two kinds of liquids to be separated preferably while reducing an axial length.SOLUTION: An oil seal structure 10 is used to seal a space between a first member 1 and a second member 2 which rotate relative to each other and has: a first annular body 11 fixed to the first member 1; a second annular body 12 which is fixed to the second member 2 and faces the first annular body 11; a first oil seal 13 disposed between the first member 1 and the second annular body 2; and a second oil seal 14 which is disposed between the second member 2 and the first annular body 11 so as to overlap with the first oil seal 13 in a radial direction of the first member 1 and the second member 2.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an oil seal structure that prevents a liquid such as oil from leaking out, and particularly relates to an oil seal structure that preferably separates two types of liquids.

In vehicles such as trucks, a large number of oil seals that are provided on the outer periphery of a rotating body and prevent leakage of liquid such as oil are used. Such an oil seal is disclosed in Patent Document 1, for example.

Japanese Patent Publication No. 2008-509309

Where two different liquids are used close to each other, two oil seals may be installed adjacent to each other and in opposite directions so that the two liquids are separated from each other so as not to mix. is there.

In such a case, when the two oil seals are arranged side by side along the axial direction of the rotating body, there is a problem that the axial length becomes long. Depending on the installation location of the oil seal, it may be difficult to secure the axial length. Therefore, there is a demand for an oil seal structure that can suppress the axial length and suitably separate two kinds of liquids. There is.

An object of the present disclosure is to provide an oil seal structure capable of suitably separating two types of liquids while suppressing the axial length.

An oil seal structure according to an aspect of the present disclosure is an oil seal structure that seals between a first member and a second member that rotate relative to each other, and a first annular body fixed to the first member, A second annular body fixed to the second member and facing the first annular body, a first oil seal arranged between the first member and the second annular body, and the second member The first oil seal and a second oil seal arranged so as to overlap the first annular body and the second annular body in the radial direction are provided between the first oil seal and the first annular body.

An oil seal structure according to an aspect of the present disclosure is an oil seal structure that seals between a relatively rotating first member and a second member, and is opposed to each other between the first member and the second member. A first cylindrical body and a second cylindrical body, a first wall body connected to the first cylindrical body, and a first base portion for fixing the first wall body to the first member. A second wall body connected to the second cylinder body, a second base portion for fixing the second wall body to the second member, and a second wall body arranged between the first member and the second cylinder body A first oil seal, and a second oil seal arranged between the second member and the first cylinder, the first cylinder, the first wall, and An air chamber in which air is enclosed is configured by the second cylindrical body, the second wall body, and the first oil seal and the second oil seal.

According to the present disclosure, it is possible to suitably separate two types of liquid while suppressing the axial length.

The figure which illustrated the oil seal structure which concerns on the 1st Embodiment of this indication. Enlarged view of oil seal The figure which illustrated the oil seal structure which concerns on the 2nd Embodiment of this invention. The figure which illustrated the oil seal structure which concerns on the 3rd Embodiment of this invention.

Hereinafter, each embodiment of the present disclosure will be described in detail with reference to the drawings. However, a more detailed description than necessary, for example, a detailed description of a well-known matter or a duplicate description of substantially the same configuration may be omitted.

<First Embodiment>
FIG. 1 is a diagram illustrating an oil seal structure 10 according to a first embodiment of the present disclosure. As shown in FIG. 1, the oil seal structure 10 is provided between the first member 1 and the second member 2 which rotate relative to each other. As an example, the first member 1 and the second member 2 are members that constitute a transmission of a vehicle such as a truck, and more specifically, the first member 1 is a transmission case and the second member 2 is an input shaft. That is, in the example of the first embodiment, the first member 1 is a non-rotating body and the second member 2 is a rotating body. Although not shown, the rotation center (rotation axis) of the second member 2 exists below the oil seal structure 10 in FIG. 1.

The location of the oil seal structure 10 is not particularly limited in the present invention. The oil seal structure 10 of the present invention may be arranged in a drive device such as a transfer, an internal combustion engine, or the like, in addition to the transmission. Further, the oil seal structure 10 of the present invention may be used for other than a vehicle. The oil seal structure of the present invention has two oil seals and is used to separate two types of liquids. Therefore, the oil seal structure of the present invention can be suitably used for separating two types of liquids in a place where the two types of liquids are used close to each other.

The space on one side of the oil seal structure 10, for example, the space on the left side in FIG. 1, is a clutch chamber provided with, for example, a clutch (not shown), and is filled with a liquid such as ATF (Automatic Transmission Fluid). The other space of the oil seal structure 10, for example, the space on the right side in FIG. 1, is inside the transmission provided with, for example, a transmission gear (not shown), and the gear oil stored in the lower portion of the transmission case is scraped by the rotation of the gear. As a result, air and splashed gear oil are mixed. In the following description, the space on the left side of the oil seal structure 10 will be referred to as a first space S1, and the space on the right side of the oil seal structure 10 will be referred to as a second space S2.

As described above, different types of liquid (oil) exist in the first space S1 and the second space S2. The oil seal structure 10 prevents the liquid from leaking out from the respective spaces, and prevents the liquid of a different type from the liquid originally existing in the respective spaces from entering the first member 1 and the second member 2. The space is sealed.

As shown in FIG. 1, the oil seal structure 10 includes a first annular body 11, a second annular body 12, a first oil seal 13, and a second oil seal 14. The first annular body 11 and the second annular body 12 are annular bodies coaxial with the second member 2 that is a rotating body.

The 1st annular body 11 has the 1st cylindrical body 111, the 1st wall body 112, and the 1st base part 113, and these are formed in a U-shaped cross section (U shape) shape. It is an annular member. Similarly, the second annular body 12 has a second cylindrical body 121, a second wall body 122, and a second base portion 123, and is formed in a U-shaped cross section (U shape) by these. It is a circular member.

The first cylindrical body 111 and the second cylindrical body 121 are members having a cylindrical shape coaxial with the second member 2. The first cylindrical body 111 is fixed to the first member 1 by the first base portion 113 fixed to the inner wall surface of the first member 1 and the first wall body 112 connected almost vertically to the first base portion 113. Has been done. Similarly, the second cylindrical body 121 includes a second base portion 123 fixed to the outer peripheral surface of the second member 2 and a second wall body 122 that is connected to the second base portion 123 substantially perpendicularly to the second member. It is fixed at 2. Therefore, the first annular body 11 is a non-rotating body, and the second annular body 12 is a rotating body that rotates integrally with the second member 2. The method of fixing the first base portion 113 to the first member 1 and the method of fixing the second base portion 123 to the second member 2 are not particularly limited, but for example, a method of fixing by press fitting may be adopted.

As shown in FIG. 1, the first cylindrical body 111 and the second cylindrical body 121 are arranged so as to face each other, as shown in FIG. As a result, the first annular body 11 and the second annular body 12 having a U-shape are in a state of being meshed with each other, in other words, in the radial direction of the first cylindrical body 111 and the second cylindrical body 121. They are arranged in an overlapping state.

The first oil seal 13 is arranged between the first base portion 113 and the outer peripheral surface of the second cylindrical body 121. In addition, the second oil seal 14 is arranged between the second base portion 123 and the inner peripheral surface of the first cylindrical body 111. In this way, the first oil seal 13 and the second oil seal 14 are arranged between the first annular body 11 and the second annular body 12 in a state of overlapping each other in the radial direction. Therefore, the first oil seal 13 and the second oil seal 14 are also arranged so as to overlap each other in the radial direction. As a result, the axial length of the oil seal structure 10 can be kept short.

As shown in FIG. 1, the first cylindrical body 111, a portion of the first wall body 112, the second cylindrical body 121, a portion of the second wall body 122, the first oil seal 13, and the second The oil seal 14 constitutes an air chamber AC isolated from the first space S1 and the second space S2. Due to this air chamber AC, even if the liquid (ATF) in the first space S1 leaks from the first oil seal 13, the leaked liquid does not further leak to the second space S2. On the contrary, even if the liquid (gear oil) in the second space S2 leaks out from the second oil seal 14, the air chamber AC prevents the leaked liquid from further leaking out to the first space S1. That is, the air chamber AC functions as a buffer space for leaking liquid in the oil seal structure 10.

Next, the first oil seal 13 and the second oil seal 14 will be described. The first oil seal 13 and the second oil seal 14 are general oil seals having the same structure. FIG. 2 is an enlarged view of the first oil seal 13 (second oil seal 14).

As shown in FIG. 2, the first oil seal 13 has a first fitting portion 131, a first metal ring 132, a first spring 133, and a first seal lip 134. The first fitting portion 131 strongly contacts the first base portion 113 to fix the first oil seal 13 to the first base portion 113 and prevent liquid, air, etc. from entering from the first space S1. To The first metal ring 132 imparts rigidity to the first oil seal 13 and secures a force necessary for fitting the first fitting portion 131 and the first base portion 113. The first spring 133 applies a pressing force to the first seal lip 134 in the outward direction. The tip portion of the first seal lip 134 contacts the outer peripheral surface of the second cylindrical body 121 fixed to the second member 2 that is a rotating body. The tip of the first seal lip 134 comes into contact with the outer peripheral surface of the second cylindrical body 121, whereby the liquid (ATF) is prevented from leaking from the first space S1.

The structure of the second oil seal 14 is also similar to that of the first oil seal 13 described above, and the second fitting portion 141, the second metal ring 142, the second spring 143, the second seal lip 144, Have. In the second oil seal 14, the second fitting portion 141 is in contact with the second base portion 123, and the second seal lip 144 is in contact with the inner peripheral surface of the first cylindrical body 111 fixed to the first member 1. is doing. This prevents the liquid (gear oil) from leaking out from the second space S2.

The orientation is important when installing the oil seal. The reason is that when the rotating body rotates with the oil seal attached, a force that sucks from one side to the other side is generated with the contact surface between the seal lip and the rotating body as a boundary (called pump action etc.). Is. In the example of the first oil seal 13 shown in FIG. 2, a flow such that the first seal lip 134 is drawn from the right side to the left side of the drawing with the tip portion of the first seal lip 134 as a boundary is generated. The direction in which this pump action occurs is determined by the shape of the seal lip, the pressure distribution on the contact surface of the seal lip, and the like.

In the oil seal structure 10 shown in FIG. 1, the first oil seal 13 is attached in such a direction that a pumping action is generated from the air chamber AC to the first space S1 side. Further, the second oil seal 14 is attached in such a direction that a pumping action is generated from the air chamber AC to the second space S2 side. With such a configuration, leakage of liquid from the first space S1 to the air chamber AC side and leakage of liquid from the second space S2 to the air chamber AC side are preferably prevented.

Although not particularly shown, one side surface 134F of the first seal lip 134 may be provided with a groove (called a helix or the like) for increasing the pump effect of the first oil seal 13. As a result, in the first oil seal 13, the liquid (ATF, etc.) in the first space S1 flows from the minute gap between the tip of the first seal lip 134 and the outer peripheral surface of the second cylindrical body 121 to the air chamber AC side. Even if it tries to leak out, the flow of pushing back to the first space S1 side occurs due to the rotation of the second member 2, and as a result, the liquid is suitably prevented from leaking out from the first space S1. Also in the second oil seal 14, by providing a groove on one side surface 144F of the second seal lip 144, it is possible to suitably prevent the liquid from leaking from the second space S2 to the air chamber AC side.

As described above, according to the oil seal structure 10 according to the first embodiment of the present invention, the first oil seal 13 and the second oil seal 14 are the first annular body in a state where they are radially overlapped with each other. 11 and the second annular body 12. Therefore, the first oil seal 13 and the second oil seal 14 are also arranged so as to overlap each other in the radial direction. Therefore, in the oil seal structure 10, for example, the length in the axial direction can be reduced as compared with the case where two oil seals are arranged side by side along the axial direction.

Further, according to the oil seal structure 10 according to the first embodiment of the present invention, the first cylindrical body 111, a part of the first wall body 112, the second cylindrical body 121, and the second wall body 122. , A first oil seal 13, and a second oil seal 14 form an air chamber AC isolated from the first space S1 and the second space S2. The air chamber AC preferably prevents the liquid (ATF) in the first space S1 from leaking to the second space S2 or the liquid (gear oil) in the second space S2 from leaking to the first space S1. can do.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. In the second embodiment, a modified example of the oil seal structure 10 according to the first embodiment described above will be described. FIG. 3 is a diagram illustrating an oil seal structure 10a according to a second embodiment of the present invention.

As shown in FIG. 3, the oil seal structure 10a according to the second embodiment has the same configuration as the oil seal structure 10 of the first embodiment described above. The difference between the oil seal structure 10a according to the second embodiment and the oil seal structure 10 according to the first embodiment is that the installation method of the second oil seal 14 is different.

As shown in FIG. 3, in the oil seal structure 10a according to the second embodiment, the second fitting portion 141 of the second oil seal 14 contacts the inner peripheral surface of the first cylindrical body 111, and the second seal The lip 144 is in contact with the second base portion 123 fixed to the second member 2. As a result, the second oil seal 14 is fixed to the inner peripheral surface of the first cylindrical body 111. The second oil seal 14 is attached in the same direction as that of the first embodiment so that the force of drawing the air chamber AC to the second space S2 is generated (pump action is generated).

That is, in the oil seal structure 10a according to the second embodiment, both the first oil seal 13 and the second oil seal 14 are fixed to the first annular body 11. Even in such a configuration, as in the oil seal structure 10 according to the first embodiment, the first oil seal 13 and the second oil seal 14 are arranged in a state of overlapping each other in the radial direction. The axial length of the seal structure 10a can be kept short. Further, the first cylindrical body 111, a part of the first wall body 112, a second cylindrical body 121, a part of the second wall body 122, the first oil seal 13, the second oil seal 14, The air chamber AC isolated from the first space S1 and the second space S2 is constituted by. The air chamber AC preferably prevents the liquid (ATF) in the first space S1 from leaking to the second space S2 or the liquid (gear oil) in the second space S2 to leak to the first space S1. can do.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. Also in the third embodiment, a modification of the oil seal structure 10 according to the first embodiment described above will be described. FIG. 4 is a diagram illustrating an oil seal structure 10b according to a third embodiment of the present invention.

As shown in FIG. 4, the oil seal structure 10b according to the third embodiment has a first annular body 11 and a second annular body 12 which are not formed in a U-shape. In the third embodiment, the first annular body 11 has a shape in which the first cylindrical body 111 and the first base portion 113 are connected to the first wall body 112 in different directions. Similarly, the second annular body 12 has a shape in which the second cylindrical body 121 and the second base portion 123 are connected to the second wall body 122 in different directions.

Then, the first oil seal 13 is fixed such that the first fitting portion 131 contacts the inner wall surface of the first member 1 and the first seal lip 134 contacts the outer peripheral surface of the second cylindrical body 121. In addition, the second oil seal 14 is fixed such that the second fitting portion 141 contacts the inner peripheral surface of the first cylindrical body 111 and the second seal lip 144 contacts the outer peripheral surface of the second member 2. That is, in the oil seal structure 10b according to the third embodiment, the first oil seal 13 is attached to the first member 1 and the second oil seal 14 is attached to the first annular body 11 fixed to the first member 1, respectively. It is fixed.

Even with such a configuration, as with the oil seal structure 10 according to the first embodiment, the first oil seal 13 and the second oil seal 14 are arranged in a state of overlapping each other in the radial direction. The axial length of the seal structure 10b can be kept short. Further, the first cylindrical body 111, a part of the first wall body 112, a second cylindrical body 121, a part of the second wall body 122, the first oil seal 13, the second oil seal 14, The air chamber AC isolated from the first space S1 and the second space S2 is constituted by. The air chamber AC preferably prevents the liquid (ATF) in the first space S1 from leaking to the second space S2 or the liquid (gear oil) in the second space S2 from leaking to the first space S1. can do.

Further, in the oil seal structure 10b according to the third embodiment, the first oil seal 13 is in direct contact with the first member 1 and the second oil seal 14 is in direct contact with the second member 2. Therefore, the height of the oil seal structure 10b is compared with the height of the oil seal structure 10 (10a) according to the first (2) embodiment, and the thickness of the first base portion 113 and the second base portion 123 is increased. The amount can be lowered. Thereby, the space in the direction perpendicular to the axis can be omitted as compared with the oil seal structure 10 (10a) according to the first (2) embodiment.

The present disclosure is useful in oil seal structures that separate different types of liquids.

1 1st member 2 2nd member 10, 10a, 10b Oil seal structure 11 1st annular body 12 2nd annular body 13 1st oil seal 14 2nd oil seal 111 1st cylindrical body 112 1st wall body 113 1st base Part 121 2nd cylindrical body 122 2nd wall body 123 2nd base part 131 1st fitting part 132 1st metal ring 133 First spring 134 1st seal lip 134F side surface 141 2nd fitting part 142 2nd metal ring 143 2nd Spring 144 Second seal lip 144F Side surface

Claims (6)

An oil seal structure for sealing between a first member and a second member that rotate relative to each other,
A first annular body fixed to the first member;
A second annular body that is fixed to the second member and faces the first annular body;
A first oil seal arranged between the first member and the second annular body;
Between the second member and the first annular body, the first oil seal and the second oil seal arranged so as to overlap in the radial direction of the first annular body and the second annular body,
With an oil seal structure. An air chamber in which air is enclosed is formed by the first oil seal and the second oil seal, and the wall surfaces of the first annular body and the second annular body.
The oil seal structure according to claim 1. An oil seal structure for sealing between a first member and a second member that rotate relative to each other,
Between the first member and the second member, a first cylindrical body and a second cylindrical body provided to face each other,
A first wall body connected to the first cylindrical body;
A first base portion for fixing the first wall body to the first member;
A second wall body connected to the second cylindrical body;
A second base portion for fixing the second wall body to the second member;
A first oil seal arranged between the first member and the second cylindrical body;
A second oil seal arranged between the second member and the first cylindrical body;
Have
The first cylindrical body, the first wall body, the second cylindrical body, the second wall body, and the first oil seal and the second oil seal form an air chamber in which air is sealed. Is
Oil seal structure. The first oil seal has a first fitting portion that comes into contact with the first base portion and fixes the first oil seal, and a first seal lip that comes into contact with the second cylindrical body,
The second oil seal includes a second fitting portion that contacts the second base portion and fixes the second oil seal, and a second seal lip that contacts the first cylindrical body,
The first oil seal and the second oil seal are arranged so as to generate a force of drawing from the inside of the air chamber to the outside of the air chamber through the first seal lip and the second seal lip. Is
The oil seal structure according to claim 3. The first oil seal has a first fitting portion that comes into contact with the first base portion and fixes the first oil seal, and a first seal lip that comes into contact with the second cylindrical body,
The second oil seal has a second fitting portion that comes into contact with the first cylindrical body and fixes the second oil seal, and a second seal lip that comes into contact with the second base portion.
The first oil seal and the second oil seal are arranged so as to generate a force of drawing from the inside of the air chamber toward the outside of the air chamber through the first seal lip and the second seal lip. Is
The oil seal structure according to claim 3. The first oil seal has a first fitting portion that comes into contact with the first member and fixes the first oil seal, and a first seal lip that comes into contact with the second cylindrical body,
The second oil seal has a second fitting portion that comes into contact with the first cylindrical body and fixes the second oil seal, and a second seal lip that comes into contact with the second member,
The first oil seal and the second oil seal are arranged so as to generate a force of drawing from the inside of the air chamber toward the outside of the air chamber through the first seal lip and the second seal lip. Is
The oil seal structure according to claim 3.

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