JP2017141849A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of noise caused by the self-excited vibration of a seal lip by applying measures to a slinger in a sealing device which is formed of a combination of the seal lip and the slinger.SOLUTION: In a sealing device for making a stationary-side seal lip slidably contact with a rotation-side slinger, the slinger has a structure in which a plurality of plate-shaped members are overlapped on each other in a thickness direction, and an elastic body is interposed between the adjacent plate-shaped members. The slinger comprises: a first plate-shaped member integrally having a flange part at one end of a cylindrical part; a second plate-shaped member integrally having a flange part arranged at the seal lip side of the flange part of the first plate-shaped member at one end of a cylindrical part which is arranged at an external peripheral side of the cylindrical part of the first plate-shaped member; and the elastic body integrally having a flange part arranged between both the flange parts at one end of a cylindrical part arranged between both the cylinder parts.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used, for example, in the field related to automobiles or the field related to transportation equipment.

  2. Description of the Related Art Conventionally, as shown in FIG. 2, as a sealing device used for a crankshaft of an automobile engine or a differential side of a propeller shaft, there is known a sealing device that slidably contacts a stationary-side seal lip a with a rotating-side slinger b. The slinger b has a single-sheet structure in which a metal plate is pressed.

  In the above prior art, depending on the usage situation, self-excited vibration (stick slip) occurs in the seal lip a, resonance of the slinger b is excited, and abnormal noise called “squeal” or “key sound” is generated. There is a problem to do.

  For this reason, measures have been proposed in which a vibration suppression ring made of a vibration damping material is assembled to the seal lip (Patent Document 1), or a rib for vibration damping is provided on the seal lip (Patent Document 2). In any of the above countermeasures, the former seal lip is taken out of the sealing device composed of a combination of a seal lip and a slinger. Therefore, there is a need for a technique (countermeasure) that suppresses the generation of abnormal noise by taking measures against the latter slinger among the sealing devices composed of a combination of a seal lip and a slinger.

Japanese Patent No. 5504649 JP 2004-218797 A

  In view of the above, the present invention provides a sealing device capable of suppressing the generation of abnormal noise by taking measures against the latter slinger among the sealing devices composed of a combination of a seal lip and a slinger. With the goal.

  In order to achieve the above object, a sealing device of the present invention is a sealing device that slidably contacts a stationary-side seal lip with a rotating-side slinger, wherein the slinger has a plurality of plate-like members in the thickness direction. In addition to overlapping, an elastic body is interposed between the plate-like members adjacent to each other.

  In the present invention, the slinger is not a single metal plate structure, but a plurality of plate members stacked in the thickness direction, and an elastic body is interposed between the plate members adjacent to each other. Therefore, the slinger has a function as a damping steel plate. Therefore, since the slinger does not resonate and exhibits a damping effect, it is possible to suppress the generation of noise due to the self-excited vibration of the seal lip.

  In general, the slinger is generally L-shaped in a half-cut section by integrally providing a flange portion at one end of the cylindrical portion. Therefore, the slinger is a first plate-like member integrally provided with a flange portion at one end of the tubular portion, and the first plate-like member is disposed at one end of the tubular portion disposed on the outer peripheral side of the tubular portion of the first plate-like member. A second plate-like member integrally provided with a flange portion disposed on the seal lip side of the flange portion, and a flange portion disposed between the two flange portions at one end of the tubular portion disposed between the two tubular portions By combining the elastic bodies integrally with each other, it is possible to give the slinger a function as a damping steel plate while keeping the slinger as a whole in a substantially L-shaped section. The elastic body is made of a predetermined resin or rubber-like elastic body, and is interposed between adjacent plate-like members by means such as adhesion or press-fitting.

  According to the present invention, it is possible to suppress the generation of noise due to the self-excited vibration of the seal lip by taking measures against the latter slinger in the sealing device composed of the combination of the seal lip and the slinger.

FIG. 3 is a half sectional view of a sealing device according to an embodiment of the present invention. Half-sectional view of a sealing device according to a conventional example

The present invention includes the following embodiments.
(1) The slinger that contacts the seal lip is composed of two (or a plurality of) plate-like members and a resin and a rubber-like elastic body inserted by bonding or press-fitting between the plate-like members. And With this configuration, the slinger has a function as a vibration-damping steel plate, and can suppress resonance (squeal) due to lip sliding.
(2) When the seal lip and slinger slide, stick-slip may occur and slinger resonance may occur, but in the present invention, the vibration level is suppressed by the damping effect of the resin or rubber in the slinger and noise is reduced. The effect can be expected.

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

  FIG. 1 shows a sealing device 1 according to an embodiment of the present invention.

  In the sealing device 1 according to this embodiment, the sealing fluid (oil or the like) on the inner side A does not leak to the outer side B between the housing 51 and the rotating shaft 61 inserted through the shaft hole 52 provided in the housing 51. A sealing device 1 (for example, an oil seal for an engine) 1 that is attached to the outer periphery of the rotating shaft 61 and the inner periphery of the shaft hole 52 of the housing 51 that is located on the outer side B of the slinger 11 The lip seal member 21 is used in combination.

  The slinger 11 includes a cylindrical portion 12 that is fixed (fitted) to the outer peripheral surface of the rotating shaft 61, and a radially outward flange portion 13 that is provided at one end (an inner end portion) of the cylindrical portion 12. In this embodiment, the slinger 11 superimposes the two plate-like members 14 and 15 in the thickness direction, and the two plates. The elastic members 16 are interposed between the shaped members 14 and 15.

  More specifically, the slinger 11 has a flange portion (first flange portion) 14b integrally formed at one end of a cylindrical portion (first cylindrical portion) 14a fixed (fitted) to the outer peripheral surface of the rotating shaft 61. A first plate-like member 14 having a substantially L-shaped half-section and provided at one end of a tubular portion (second tubular portion) 15a disposed on the outer peripheral side of the tubular portion 14a of the first plate-like member 14; A second plate-like member 15 having a substantially L-shaped half-cut section integrally provided with a flange portion (second flange portion) 15b disposed on the seal lip side of the flange portion 14b of the one-plate-like member 14, and both cylindrical portions 14a. , 15a, and a flange portion (third flange portion) 16b disposed between the flange portions 14b and 15b at one end of a cylindrical portion (third tubular portion) 16a disposed between the two flange portions 14b and 15b. It consists of a combination with a letter-shaped elastic body 16, and thus the entire slinger 11 It is formed in the half-cut approximately L-shaped cross section as.

  The first and second plate-like members 14 and 15 are each made of a metal material, for example, a steel plate. The first and second plate-like members 14 and 15 are connected via the elastic body 16 and are not in direct contact with each other. The elastic body 16 is made of a predetermined resin or rubber-like elastic body, and this is interposed between the first and second plate-like members 14 and 15 by means such as adhesion or press-fitting.

  On the other hand, the lip seal member 21 is attached (vulcanized and bonded) to the mounting ring 22 made of a rigid material such as metal that is fixed (fitted) to the inner peripheral surface of the shaft hole 52 of the housing 51. An outer peripheral seal portion 24 that seals between the housing 51 and the mounting ring 22 by contacting the inner peripheral surface of the shaft hole 52 of the housing 51, and the rubber-like elastic body 23. An end surface adhering portion 25 attached to the end surface portion of the ring 22 and an outboard end surface of the flange portion 13 of the slinger 11 and in contact with the outboard end surface of the flange portion 15b of the second plate member 15 are slidably contacted. The first seal lip (main lip, end lip) 26 and the outer peripheral surface of the cylindrical portion 12 of the slinger 11 and slidably contact the outer peripheral surface of the cylindrical portion 15a of the second plate member 15. 2 seal lip (medium Lip, radial lip) 27 and a third seal lip (dust strip) which is slidably in contact with the outer peripheral surface of the cylindrical portion 12 of the slinger 11 and the outer peripheral surface of the cylindrical portion 15a of the second plate member 15. , Radial lip) 28 are provided integrally.

  In the sealing device 1 having the above-described configuration, the slinger 11 is not a single metal plate structure, but a plurality of plate-like members 14 and 15 that are stacked in the thickness direction, and the plate-like members 14 and 15 that are adjacent to each other. Since the elastic body 16 is interposed between 15, the slinger 11 functions as a damping steel plate. Therefore, even if the self-excited vibration is generated in the seal lips 26, 27, 28, the slinger 11 does not resonate and exhibits a vibration control action, so that the generation of noise due to the self-excited vibration of the seal lips 26, 27, 28 is suppressed. In addition, the volume of the generated abnormal noise can be reduced.

  When manufacturing the slinger 11, a flat plate material composed of a laminated structure of the first and second plate members 14 and 15 and the elastic body 16 is prepared in advance, and this material is formed into a product shape by pressing. It is preferable on the process.

DESCRIPTION OF SYMBOLS 1 Sealing device 11 Slinger 12, 14a, 15a, 16a Cylindrical part 13, 14b, 15b, 16b Flange part 14, 15 Plate-like member 16 Elastic body 21 Lip seal member 22 Mounting ring 23 Rubber-like elastic body 24 Outer peripheral seal part 25 End face adherence part 26, 27, 28 Seal lip 51 Housing 52 Shaft hole 61 Rotating shaft

Claims (3)

A sealing device that slidably contacts a stationary-side seal lip with a rotating-side slinger,
The slinger has a structure in which a plurality of plate-like members are stacked in the thickness direction, and an elastic body is interposed between the plate-like members adjacent to each other. The sealing device according to claim 1.
The slinger has a first plate-like member integrally provided with a flange portion at one end of the cylindrical portion, and a first end of the cylindrical portion arranged on the outer peripheral side of the cylindrical portion of the first plate-like member. A second plate-shaped member integrally provided with a flange portion disposed on the seal lip side of the flange portion of the plate-shaped member, and one end of the tubular portion disposed between the two tubular portions between the both flange portions. A sealing device comprising: an elastic body integrally provided with a flange portion to be disposed. The sealing device according to claim 1 or 2,
The sealing device according to claim 1, wherein the elastic body is made of a predetermined resin or rubber-like elastic body.

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