JP2018021647A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of oil leakage even if a sealing device is employed to a portion in which the two-sided alignment of metal exists.SOLUTION: In a sealing device having a lip seal member 20 attached to a non-rotatable housing 2, and a slinger 10 attached to an external peripheral face of a rotating shaft 4 which is inserted into an axial hole of the housing, the slinger comprises a sleeve 12 attached to the external peripheral face of the rotating shaft, and a seal flange 14 which is formed toward the outside of a radial direction from one end part of the sleeve. The lip seal member comprises a seal lip 24, an attachment ring 22 and an elastic part 26. The seal lip is arranged so as to contact with the seal flange in a slidable state that the seal lip is slidable therewith. The attachment ring is composed of a metal material, and functions as a member for making the lip seal member pressure-adhere to the housing. A coated part is composed of an elastic material, and formed so as to cover a surface of the attachment ring in a portion at which at least the lip seal member contacts with an internal peripheral face of the axial hole.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing device. More specifically, a sealing device for preventing a fluid to be sealed in the machine from leaking out of the machine, a seal flange attached to a rotating shaft, and a lip seal member attached to a non-rotating housing It is related with a sealing device provided with.

  Patent Document 1 discloses a sealing device that includes a lip seal member that is mounted on a non-rotating housing, and a seal flange that is mounted on a rotating shaft that is inserted into the housing and is slidably installed on the seal lip. ing. The seal lip has a mounting ring formed of a metal material, and the sealing device is mounted by press-fitting the mounting ring into the housing.

JP-A-2015-232364 JP 2014-1229837 A International Publication No. 2009/125734

  When a sealing device that is metal-fitted as in Patent Document 1 is applied to a portion where two-sided alignment exists, such as an engine block and a lower case, the portion is a three-sided alignment of metal materials. In such a case, there is a risk that oil leakage may occur due to a combination of manufacturing variations on the housing side and variations on the sealing device side in the three-sided portion of the metal. Therefore, it is desired to develop a sealing device that can be applied to a portion where metal two-sided alignment exists.

  The present invention aims to solve the above-described problems, and provides an improved sealing device that can suppress oil leakage even when applied to a portion where two-face alignment exists.

  In order to achieve the above object, the present invention is a sealing device, which is a lip seal member mounted on a non-rotating housing, and a slinger mounted on an outer peripheral surface of a rotating shaft inserted into a shaft hole of the housing. . The slinger includes a sleeve that is mounted on the outer peripheral surface of the rotating shaft, and a seal flange that is formed radially outward from one end of the sleeve. The lip seal member includes a seal lip, an attachment ring, and an elastic portion. The seal lip is arranged to contact the seal flange in a slidable state. The mounting ring is made of a metal material and is a member for pressing the lip seal member to the housing. The covering portion is made of an elastic material and is formed so as to cover the surface of the mounting ring at least in a portion where the lip seal member is in contact with the inner peripheral surface of the shaft hole.

  Moreover, the sealing device in this invention is good also as a structure provided with the metal ring for pressing a lip seal member to the seal flange side.

  According to the present invention, the elastic portion made of the elastic material is interposed between the mounting ring made of the metal material and the inner peripheral surface of the shaft hole of the housing. Thereby, even when the housing has a two-sided portion at the mounting position of the sealing device, the sealing device can be mounted in a highly sealed state, and leakage of the liquid to be sealed can be suppressed.

  Further, in the configuration having the metal ring, it is possible to further suppress the separation between the seal lip and the seal flange when the lip seal member is pressed.

It is a schematic diagram for demonstrating the structure of the end surface oil seal of embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram for explaining an end face oil seal according to the first embodiment. The end face oil seal in FIG. 1 is a sealing device, and is used, for example, in an engine block of an automobile. In the present embodiment, the liquid to be sealed of the end face oil seal is, for example, oil. The end face oil seal is installed in a housing shaft hole between the space A and the space B separated by the housing 2, and prevents oil that is a liquid to be sealed on the space A side from leaking to the space B side. The sealing device.

  The end face oil seal includes a slinger 10 and a lip seal member 20. The slinger 10 is formed on the sleeve 12 mounted on the outer peripheral surface of the rotary shaft 4 and from the end on the space A side of the sleeve 12 in a direction substantially perpendicular to the axial direction of the rotary shaft 4, that is, radially outward. And a sealed flange 14. The slinger 10 has the effect of shaking off the oil by rotating together with the rotating shaft 4.

  The lip seal member 20 is a member fitted to the non-rotating housing 2. The lip seal member 20 includes a mounting ring 22, a seal lip 24, an elastic portion 26, a dust lip 28, and an oil recovery lip 30. For example, the attachment ring 22 is a member formed by pressing a metal plate such as a steel plate. The attachment ring 22 has a substantially cylindrical portion installed at a position facing the inner peripheral surface C of the shaft hole of the housing 2 and a portion extending in the direction of the rotation shaft 4 from one end side of this portion.

  The seal lip 24, the elastic portion 26, the dust lip 28, and the oil recovery lip 30 are integrally formed of a rubber-like elastic material (rubber material or a synthetic resin material having rubber-like elasticity) and bonded to the mounting ring 22. .

  The seal lip 24 has a base portion 20A near the end of the mounting ring 22 on the rotating shaft 4 side as a root, the tip extends to the seal flange 14 side and the outer diameter side, and has a conical shape opened to the seal flange 14 side. Is formed. The seal lip 24 is in close contact with the seal flange 14 at the tip in a slidable state. Since the seal flange 14 and the seal lip 24 are slidably installed so as to be slidable, the oil can be sealed by the end face oil seal.

  Each of the dust lip 28 and the oil recovery lip 30 is formed so that the tip thereof extends toward the inner diameter side with the root portion 20A as the root.

  The elastic portion 26 covers the surface facing the space B side of the mounting ring 22 and the inner peripheral surface C of the shaft hole of the housing 2 and the tip end surface on the seal flange 14 side with the root portion 20A as the root. It is formed as follows. A metal ring 40 is press-fitted on the side of the elastic portion 26 that is in contact with the inner peripheral surface of the housing 2. The metal ring 40 is a ring-shaped member centered on the axis of the rotating shaft 4.

  The end face oil seal is installed with the slinger 10 not attached to the rotating shaft 4 and the lip seal member 20 fitted in the shaft hole of the housing 2. As described above, at least a portion of the mounting ring 22 facing the inner peripheral surface C of the shaft hole of the housing 2 is configured so that the entire surface is covered with the elastic portion 26. That is, an elastic portion 26 made of an elastic material is interposed between the mounting ring 22 and the housing 2 at a portion in contact with the inner peripheral surface C of the shaft hole of the housing 2.

  In the case where two metal surfaces are present on the inner peripheral surface C, if the mounting ring 22 is in direct contact therewith, the three surfaces of the metal are aligned. However, according to the end face oil seal of the present embodiment, the three-face alignment can be avoided by interposing the elastic portion 26 between the mounting ring 22 and the housing 2. Here, the elastic part 26 comes into close contact. In addition, even when there is metal two-face alignment in the inner peripheral surface C portion, the elastic portion 26 is in close contact with this portion. Accordingly, it is possible to effectively suppress oil leakage from the metal two-sided portion.

  Further, when the elastic portion 26 is press-fitted into the housing 2, elastic deformation of the elastic portion 26 occurs if there is no metal ring. As a result, when the press-fitting jig is removed, a spring back phenomenon that tries to return the deformation occurs, and the seal may shift. Since the end face oil seal is a seal in the thrust direction, the movement of the lip seal member 20 due to the spring back may reduce the sealing performance of the seal lip 24. On the other hand, in the present embodiment, by incorporating the metal ring 40 and press-fitting the lip seal member 20 with the metal ring 40, seal deviation can be suppressed and the sealing performance of the end face oil seal can be ensured.

(Other embodiments)
In the present embodiment, the configuration having the metal ring 40 on the outer peripheral portion of the elastic portion 26 has been described. However, the end face oil seal does not necessarily have the metal ring 40 and may be configured to press-fit the elastic portion 26 directly. Even with such a configuration, it is possible to avoid the formation of a three-sided metal structure on at least the inner peripheral surface C of the shaft hole of the housing 2. Further, even when there is a metal two-surface mating portion of the housing 2, the oil leakage can be suppressed by the close contact of the elastic portion 26, and the sealing performance of the end face oil seal can be improved.

  In the above embodiment, when referring to the number of each element, quantity, quantity, range, etc., the reference is made unless otherwise specified or the number is clearly specified in principle. The invention is not limited to the numbers. Further, the structure and the like described in this embodiment are not necessarily essential to the present invention unless otherwise specified or clearly specified in principle.

2 Housing 4 Rotating shaft 10 Slinger 12 Sleeve 14 Seal flange 20 Lip seal member 22 Mounting ring 24 Seal lip 26 Elastic part 28 Dustrip 30 Oil recovery lip 40 Metal ring

Claims (2)

A lip seal member mounted on a non-rotating housing;
A slinger mounted on the outer peripheral surface of the rotating shaft inserted into the shaft hole of the housing,
The slinger is
A sleeve mounted on the outer peripheral surface of the rotating shaft;
A seal flange formed radially outward from one end of the sleeve;
With
The lip seal member is
A seal lip that slidably contacts the seal flange;
An attachment ring made of a metal material for crimping the lip seal member to the housing;
An elastic portion made of an elastic material so as to cover the surface of the mounting ring at least in a portion where the lip seal member is in contact with the inner peripheral surface of the shaft hole;
A sealing device comprising:   The sealing device according to claim 1, further comprising a metal ring that presses the lip seal member toward the seal flange.

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