CN213271013U

CN213271013U - Sealing device and sealing structure

Info

Publication number: CN213271013U
Application number: CN202021972228.4U
Authority: CN
Inventors: 谈雯艳; 汪叶健
Original assignee: Wuxi Nok Freudenberg Oilseal Co Ltd
Current assignee: Wuxi Nok Freudenberg Oilseal Co Ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-05-25
Anticipated expiration: 2030-09-10

Abstract

The utility model provides a sealing device and seal structure, it can improve sealing performance. The sealing device (1) is annular, is used for sealing between a through hole (101) of a shell (100) and a rotating shaft (200) inserted into the through hole (101), and comprises: a lip (21) that contacts the outer peripheral surface (201) of the rotating shaft (200); and a dust lip (22) that contacts the outer peripheral surface (201) of the rotating shaft (200) at a position that is further outside the housing (100) than the lip (21) in the direction of the axis (x), wherein the lip (21) has an inclined surface (212) and a sub-lip (26), the inclined surface (212) is inclined toward the outer peripheral side as the dust lip (22) approaches, and the sub-lip (26) protrudes from the inclined surface (212) and contacts the outer peripheral surface (201) of the rotating shaft (200).

Description

Sealing device and sealing structure

Technical Field

The utility model relates to a sealing device and seal structure especially relate to a sealing device and seal structure for rotary motion's axle.

Background

Conventionally, a sealing device such as a packing (packing) is used to seal a gap between a shaft that performs reciprocating motion such as rotation or linear motion and a through hole into which the shaft is inserted. The sealing device includes a sealing device that prevents a lubricant, which is a sealing object in the device, from leaking to the outside and prevents foreign substances such as liquid and dust from entering the device from the atmosphere side. As the conventional sealing device, an oil seal provided in an output shaft reducer has been proposed (for example, see patent document 1).

In the output shaft speed reducer described in patent document 1, an oil seal is provided only on the input shaft, and the hollow output shaft is fixed to the housing without rotating, so that it is not necessary to provide an oil seal on the output shaft. Thereby, the axial length is shortened, the leakage of the lubricating oil is prevented, and the manufacturing cost is reduced.

Documents of the prior art

Patent document

Patent document 1: JP2012-7628A publication.

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

However, in order to transmit the movement of the rotating shaft within the housing to the outside, it is difficult to omit all the seal members, and it is necessary to improve the performance of the seal members themselves. That is, it is desired to improve sealing performance by suppressing deformation of the sealing device and the like, thereby easily maintaining a state where the sealing device contacts the rotating shaft.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sealing device and a sealing structure capable of improving sealing performance.

Means for solving the problems

In order to achieve the above object, the present invention provides a sealing device having a ring shape for sealing between a through hole of a housing and a rotating shaft inserted into the through hole, the sealing device including: a lip portion that contacts an outer peripheral surface of the rotating shaft; and a dust lip that contacts the outer peripheral surface of the rotary shaft at a position that is further outside the housing than the lip portion in the axial direction, wherein the lip portion includes an inclined surface that is inclined toward the outer peripheral side as the inclined surface approaches the dust lip, and a sub lip that protrudes from the inclined surface and contacts the outer peripheral surface of the rotary shaft.

In the sealing device according to an embodiment of the present invention, the lip portion has a recessed portion on an outer peripheral side thereof, to which the chucking spring is attached, and the recessed portion has a depth that is at least half as large as a depth that can accommodate the chucking spring.

In a sealing device according to an embodiment of the present invention, the sealing device includes: an elastic member having the lip portion, the dust lip, and the recess; a reinforcing member integrally formed with the elastic member; and the garter spring.

In order to achieve the above object, the present invention relates to a sealing structure including a through hole of a housing, a rotating shaft inserted into the through hole, and an annular sealing means for sealing between the through hole and the rotating shaft, wherein the sealing means is the above sealing means, and seals an inner space of the housing by bringing at least a lip portion into contact with an outer peripheral surface of the rotating shaft.

Effect of the utility model

According to the utility model relates to a sealing device and seal structure can improve sealing performance.

Drawings

Fig. 1 is a sectional view of a sealing device according to embodiment 1 of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a sectional view of a sealing device 1 according to an embodiment of the present invention. As described below, the sealing device 1 according to the embodiment of the present invention is used to seal between the through hole of the casing 100 and the rotating shaft 200, that is, to seal the inside space a1 of the casing 100. The sealing device 1 is provided, for example, on an output shaft of an industrial reduction gear, and prevents lubricating oil, which is a sealed object in the housing 100, from leaking to the outside.

Hereinafter, for convenience of explanation, the direction of an arrow a (see fig. 1) in the axis x direction (one side in the axis direction) is referred to as an upper side, and the direction of an arrow b (see fig. 1) in the axis x direction (the other side in the axis direction) is referred to as a lower side. In a direction perpendicular to the axis x (hereinafter, also referred to as "radial direction"), a direction away from the axis x (arrow c direction in fig. 1) is an outer peripheral side, and a direction toward the axis x (arrow d direction in fig. 1) is an inner peripheral side.

As shown in fig. 1, a sealing device 1 according to an embodiment of the present invention is a ring-shaped sealing device for sealing between a through hole 101 of a housing 100 and a rotating shaft 200 inserted into the through hole 101, and includes: a lip 21 that contacts an outer peripheral surface 201 of the rotary shaft 200; and a dust lip 22 that contacts the outer peripheral surface 201 of the rotary shaft 200 at a position further outside the housing 100 than the lip 21 in the axis x direction, the lip 21 having an inclined surface 212 and a sub-lip 26, the inclined surface 212 being inclined toward the outer peripheral side as approaching the dust lip 22, the sub-lip 26 protruding from the inclined surface 212 and contacting the outer peripheral surface 201 of the rotary shaft 200. The sealing device 1 will be specifically described below.

The seal structure 10 provided with the seal device 1 includes: a housing 100 having a through hole formed at one side in the x-axis direction; and a rotation shaft 200 inserted into the through hole 101 of the housing 100. The sealing device 1 is disposed between the through hole 101 and the rotary shaft 200 to seal. That is, the sealing device 1 is for preventing the object to be sealed provided in the inner space a1 of the casing 100 from flowing out of the through hole 101. The space inside the housing 100 and above the sealing device 1 is an inner space a1 in which the object to be sealed is accommodated.

The sealing device 1 includes an elastic member 2, a reinforcing member 3, and a garter spring 4, and is formed in an annular shape as a whole.

The elastic member 2 is made of, for example, rubber or elastic resin, and includes a lip portion 21, a dust lip 22, a recess 23, an outer peripheral portion 24, and a lower portion 25.

The lip 21 is formed in a convex shape toward the inner peripheral side, and includes: an upper inclined surface 211 inclined toward the inner peripheral side as approaching the lower side in the x-direction of the axis; a lower inclined surface 212 which is continuous with a lower end of the upper inclined surface 211 and inclined toward the outer peripheral side as approaching the lower side in the axis x direction; and a top 213 formed between the two

inclined surfaces

211, 212. The lip 21 contacts the outer peripheral surface 201 of the rotary shaft 200 around the top 213. At this time, in a natural state (state before deformation), the inner diameter of the lip portion 21 is smaller than the outer diameter of the rotary shaft 200, and the lip portion 21 is brought into close contact with the outer peripheral surface 201 by elastic deformation.

The sub lip 26 is formed on the lower inclined surface 212 of the lip 21. The sub-lip 26 is formed in a convex shape toward the inner peripheral side. The inner diameter of the sub lip 26 is larger than the inner diameter of the top 213 of the lip 21 and smaller than the outer diameter of the rotary shaft 200. That is, the sub-lip 26 contacts the outer peripheral surface 201 of the rotary shaft 200, but the contact pressure thereof is smaller than that of the top portion 213. By providing the sub-lip 26, the thickness (radial dimension) of the lip portion 21 is locally increased.

The dust lip 22 is provided at a lower position (outside the housing 100) with respect to the lip 21, and contacts the outer peripheral surface 201 of the rotary shaft 200. The dust lip 22 extends toward the inner peripheral side as approaching the lower side. The inner diameter of the front end of the dust lip 22 is equal or substantially equal to the outer diameter of the rotary shaft 200.

The recess 23 is a portion for attaching the garter spring 4 to the outer peripheral side of the lip 21, and the position of the center portion (deepest portion) of the recess 23 coincides or substantially coincides with the position of the top 213 of the lip 21 in the axis x direction. The concave portion 23 is a portion sandwiched by the upper convex portion 231 and the lower convex portion 232 in the axis x direction, and is formed in an arc shape in cross section and along the outer peripheral surface of the garter spring 4. The depth of the recess 23 is at least half as large as the depth that can accommodate the garter spring 4. That is, the protruding dimension of the

protruding portions

231 and 232 is larger than the radius of the garter spring 4 having a circular cross section, with reference to the deepest position in the recessed portion 23.

The outer peripheral portion 24 is a portion covering the cylindrical portion 31 of the reinforcing member 3, which will be described later, from the outer peripheral side, and contacts the inner peripheral surface of the housing 100, thereby sealing the inner space a 1. The outer peripheral portion 24 may be fixed to the housing 100 or may be in close contact with the housing 100. The lower portion 25 covers a later-described annular portion 32 of the reinforcing member 3 from below.

The reinforcing member 3 is formed in a ring shape from, for example, a plate-shaped metal member, and integrally includes a cylindrical portion 31 and an annular portion 32, and the annular portion 32 extends from a lower end of the cylindrical portion 31 toward the inner circumferential side. By providing the reinforcing member 3, accidental deformation of the elastic member 2 is prevented.

The chucking spring 4 is formed of, for example, a metal member in an annular shape, and is disposed in the recess 23 of the elastic member 2. When the lip 21 is deformed to contact the outer peripheral surface 201 of the rotary shaft 200 as described above, the garter spring 4 is also elastically deformed to urge the lip 21 to press the outer peripheral surface 201.

As described above, the lip portion 21 is locally increased in thickness (radial dimension) by providing the sub-lip 26. This improves the rigidity of the lip portion 21, prevents unexpected deformation of the lip portion 21 (e.g., deformation away from the outer peripheral surface 201), and improves sealing performance.

Thus, according to the sealing device 1 according to the embodiment of the present invention, the lip portion 21 of the sealing device 1 has the sub lip 26, so that the sealing performance can be improved.

Further, the depth of the recess 23 for mounting the garter spring 4 on the outer peripheral side of the lip 21 is set to be half or more of that capable of accommodating the garter spring 4, so that the thickness of the lip 21 can be increased, and accidental deformation of the lip 21 is prevented to improve the sealing performance.

Further, by providing the sealing device 1 with the reinforcing member 3 and the garter spring 4, it is possible to prevent the elastic member 2 from being accidentally deformed, thereby improving the sealing performance.

The present invention is not limited to the above-described embodiments, and includes other configurations that can achieve the objects of the present invention, and the following modifications are also included in the present invention. For example, in the above embodiment, the recess 23 can accommodate more than half of the chucking spring 4, but the recess may accommodate less than half of the chucking spring. In the case of providing the clip spring, the portion for attaching the clip spring is not limited to the concave portion, and may have an appropriate shape.

In the above embodiment, one elastic member 2 includes the lip portion 21, the dust lip 22, and the recess 23, but these portions may be formed as separate elastic members. In the above embodiment, the sealing device 1 includes the reinforcing member 3 and the garter spring 4, but the reinforcing member and the garter spring may be provided as appropriate depending on the rigidity of the elastic member, and may be omitted.

The embodiments of the present invention have been described above, but the present invention is not limited to the sealing device according to the embodiments of the present invention, and includes all embodiments included in the concept of the present invention and the claims of the present invention. Further, the respective configurations may be appropriately selected and combined to achieve at least part of the above-described problems and effects. For example, the shape, material, arrangement, size, and the like of each constituent element of the above embodiments may be appropriately changed according to a specific use form of the present invention.

Description of the reference numerals

1, sealing the device; 2 an elastic member; 21 a lip portion; 211. 212 an inclined surface; 213 top; 22 dust lip prevention; 23 a recess; 231 an upper convex portion; 232 lower side convex part; 24 an outer peripheral portion; 25 lower side portion; 26 minor lips; 3 a reinforcing member; 31 a cylindrical portion; 32 an annular portion; 4, clamping a spring; 10, sealing structure; 100 of a shell; 101 through holes; 200 a rotating shaft; 201 outer peripheral surface; a1 inner space.

Claims

1. A sealing device, which is ring-shaped, for sealing between a through hole of a housing and a rotating shaft inserted into the through hole, comprising:

a lip portion that contacts an outer peripheral surface of the rotating shaft; and

a dust lip that contacts an outer peripheral surface of the rotary shaft at a position further outside the housing than the lip portion in an axial direction,

the lip portion has an inclined surface inclined toward an outer peripheral side as approaching the dust lip, and an auxiliary lip protruding from the inclined surface and contacting an outer peripheral surface of the rotary shaft.

2. The sealing device of claim 1,

a recess for mounting a garter spring is provided on the outer peripheral side of the lip,

the recess has a depth capable of accommodating more than half of the garter spring.

3. The sealing device of claim 2, comprising:

an elastic member having the lip portion, the dust lip, and the recess;

a reinforcing member integrally formed with the elastic member; and

the chucking spring.

4. A seal structure comprising a through hole of a housing, a rotary shaft inserted into the through hole, and an annular seal means for sealing between the through hole and the rotary shaft,

the sealing device according to any one of claims 1 to 3,

at least the lip portion is brought into contact with the outer peripheral surface of the rotary shaft, thereby sealing the inner space of the housing.