JPH0579047U - Sealed thrust ball bearing - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sealed thrust ball bearing that can suppress the height of the entire race without increasing the starting torque due to an axial load or the like or requiring no groove processing for sealing. A cylindrical portion 12 is formed on the inner peripheral portion of the race 1, a cylindrical portion 22 is formed on the outer peripheral portion of the race 2, and the cylindrical portion of the race 1 is formed in the gaps 10 and 20. An elastic seal composed of a cylindrical cored bar 41 fitted to the outer periphery of the portion 12 and a rubber seal 42 formed so that the lip portion 42a is brought into close contact with the outer peripheral surface of the inner periphery of the other race 2. LE 4 and Race 2
An elastic seal composed of a cylindrical core metal 51 fitted to the inner circumference of the cylindrical portion 22 and a rubber seal 52 formed so that the lip portion 52a is in close contact with the outer peripheral surface of the outer periphery of the race 1. The sealed thrust ball bearing is characterized in that it is hermetically held by the sealing member 5 and the sealing member 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealed thrust ball bearing used in, for example, a strut suspension device of a vehicle.

[0002]

[Prior Art]

 A strut type suspension device, which is a type of vehicle suspension system, receives a load from the vehicle side and a reaction force from the wheel side via springs and shock absorbers. A sealed thrust ball bearing is used between the mount member and the mount member. As a conventional sealed type thrust ball bearing, a bearing having a structure as disclosed in FIG. 3 is known (see Japanese Patent Publication No. 63-58290). That is, this bearing comprises a first annular race 61, a second annular race 62, a ball 63 rolling between the raceways of these races, and a first annular race. It is composed of an elastic seal member 64 for sealing the inner peripheral portions and the outer peripheral portions of the sleeve 61 and the second annular race 62. The elastic seal material 64 is directly baked on the surface of the first annular race 61 excluding the raceway surface 61a, and the second annular lace is formed on the inner and outer peripheral portions of the elastic seal material 64. -Lip portions 64a and 64b for sealing with the lace 62 are integrally formed, and one lip 64b is brought into contact with the lower portion of the track surface of the second annular race 62, and the other lip 64a is The second annular race 62 is fitted into an annular sealing groove 62b formed on the radially outer side (ball 63 side) of a cylindrical portion 62a formed on the inner peripheral portion of the second annular race 62 so as to be hermetically engaged. ing. Thus, the first annular race 61 and the first annular race 62 form an integral assembly.

[0003]

[Problems to be solved by the device]

 When the conventional sealed thrust ball bearing as described above is used as a strut bearing, both annular races 61 and 62 are rust-proof plated, but an elastic seal is baked on the plating layer surface. Therefore, there is a problem that the adhesive strength of the elastic seal material decreases. Further, the annular lace is strained by quenching after press forming, and this distortion causes a gap between the annular lace and the mold during baking of the elastic seal material, and the elastic seal material 64 There is a problem that the rubber material, which is the raw material of, flows into the raceways. Further, since the sealing groove 62b is processed after the press molding of the second annular race 62, the surface roughness of the processing surface of the groove 62b becomes rough, and the inner lip 64a of the elastic seal material that comes into sliding contact with this is worn. There is a big problem. Furthermore, the axial load changes the interference of the inner lip 64a and the second annular race 62 and the starting torque becomes heavy, and it is necessary to machine the sealing groove 62b. Further, the lip 64a is engaged. Therefore, there is a problem that considerable rigidity is also required. The present invention has been made in view of the above problems, and the purpose thereof is to solve the above-mentioned problems, and further, the starting torque due to an axial load etc. does not become heavy or the groove processing for sealing is unnecessary. An object of the present invention is to provide a sealed thrust ball bearing that can suppress the height of the entire race.

[0004]

[Means for Solving the Problems]

 That is, in order to solve the above-mentioned problems, the present invention is arranged so that the first race, the second race, and a proper number of rolling rollers arranged between the raceways of these races. In a sealed thrust ball bearing, which comprises an elastic seal member for sealing a gap between the inner and outer peripheral portions of the first race and the second race. A cylindrical portion is formed on the inner peripheral portion of the race, the cylindrical portion extending to the second race side and having an outer diameter smaller than the inner diameter of the second race, and the outer peripheral portion of the second race. A cylindrical portion extending to the first race and having an inner diameter larger than the outer diameter of the first race is formed, and in the gap formed between the inner peripheral portion and the outer peripheral portion of each of the races. Is a rubber seal formed so that a cylindrical cored bar fitted to the outer periphery of the cylindrical portion of the first race and a lip portion are in close contact with the outer surface of the inner peripheral portion of the second race. Toyo The constituted elastic seal, the cylindrical core metal and the lip portion fitted on the inner circumference of the cylindrical portion of the second race are brought into close contact with the outer surface of the outer circumference portion of the first race. It is characterized in that the rubber seal thus formed and the elastic seal composed of the rubber seal are respectively sealed and held.

[0005]

[Action]

 The operation when the sealed thrust ball bearing according to the present invention is used as the above means will be described using the reference numerals in the accompanying drawings. Even if the first and second races are anticorrosive plated, the adhesive strength does not decrease, and even if distortion occurs due to quenching after press molding, the rubber seal material flows on the raceway surface. There is no such thing. Particularly, in this sealed thrust ball bearing, the lip portion 42a of the rubber seal 42 of the elastic seal material 4 fitted in the cylindrical portion 12 of the first race 1 is bent at the second race 2. The lip portion 52a of the rubber seal 52 of the elastic seal material 5 which is closely attached to the outer surface of the portion 23 and fitted in the cylindrical portion 22 of the second race 2 is a bent portion of the first race 1. 13 Since it is designed to be in close contact with the outer surface, the sealing structure between each race and the lip of the rubber seal can be strengthened to prevent the intrusion of muddy water, etc., and also against the load from the vehicle side. It also acts in a direction to reduce the frictional force against the reaction force from the wheel side.

[0006]

【Example】

 A specific embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a sealed thrust ball bearing according to the present invention, and FIG. 2 is an enlarged view of a P portion of FIG. This sealed thrust ball bearing comprises a first race 1, a second race 2, a raceway surface 11 of the first race and a raceway surface 21 of the second race. An elastic seal for sealing a gap 10 between the inner circumferences of the first race 1 and the second race 2 and an appropriate number of balls 3 arranged and rolling therebetween. It is composed of a material 4 and an elastic seal material 5 for sealing a gap 20 between the outer circumferences of the first and second races 1 and 2.

A cylindrical portion 12 extending toward the second race is formed on the inner periphery of the first race 1, and a first race is formed on the outer periphery of the second race 2. A cylindrical portion 22 extending to the side is formed. In this case, the outer diameter of the cylindrical portion 12 formed on the first race 1 is smaller than the inner diameter of the second race 2 and the inner diameter of the cylindrical portion 22 formed on the second race 2. Is larger than the outer diameter of the first race 1. A bent portion 13 slightly bent toward the second race 2 is formed on the outer circumference of the first race 1, and the first race is formed on the inner circumference of the second race 2. -A bent portion 23 slightly bent to the side of the sleeve 1 is formed.

Each of the elastic seal members 4 and 5 is an elastic seal member of a seal type in which a rubber seal is fixed to a core metal, and an elastic seal member for sealing the gap 10 in the inner peripheral portion. The seal 4 is composed of a cylindrical core metal 41 and a rubber seal 42. An inward flange 41a and an outward flange 41b are formed on the core metal 41 so as to be fitted into the cylindrical portion 12 of the first race 1, and the rubber seal 42 is formed with a lip portion 42a. Thus, the outer surface of the bent portion 23 formed on the inner peripheral portion of the second race 2 is closely contacted. Similarly, the elastic seal 5 that seals the gap 20 in the outer peripheral portion is composed of a cylindrical core metal 51 and a rubber seal 52. The core metal 51 includes an outward flange 51a and an inward flange 51b. Is formed and fitted into the cylindrical portion 22 of the second race 2, and a lip portion 52a is formed on the rubber seal 52 and is formed on the outer peripheral portion of the first race 1. The outer surface of the bent portion 13 is closely attached.

Next, the assembly of the sealed thrust ball bearing including the above components will be described. First, after arranging an appropriate number of balls 3 on the first race 1, the second race 2 is covered on the first race 1 and the balls 3, and the inner peripheral portion The cylindrical core metal 41 of the elastic seal member 4 that seals the gap 10 is press-fitted into the outer peripheral surface of the cylindrical portion 12 of the inner peripheral portion of the first race 1. Next, the cylindrical core metal 51 of the elastic seal 5 that seals the gap 20 in the outer peripheral portion is press-fitted into the inner peripheral surface of the cylindrical portion 22 of the second race 2. In this way, the lip portion 42a of the rubber seal 42 of the elastic seal 4 can be brought into close contact with the outer surface of the bent portion 23 formed on the inner peripheral portion of the second race 2, and similarly the elastic seal is formed. The lip portion 52a of the rubber seal 52 of No. 5 is brought into close contact with the outer surface of the bent portion 13 formed on the outer peripheral portion of the first race 1.

In the assembly process described above, the flange 41b formed on the core metal 41 of the elastic seal material 4 and the flange 51b formed on the core metal 51 of the elastic seal material 5 are these core metals. In the process of press-fitting 41 and 51 into the cylindrical portion 12 of the first lace 1 and the cylindrical portion 22 of the second lace 2, respectively, the end portions of the respective cores do not bend, so The end portions of the cylindrical portion 12 of the first race 1 and the cylindrical portion 22 of the second race 2 do not spread, and the fitting force between the two is strong. In this way, the first race 1 and the second race 2 are fixed to each other to form a sealed thrust ball bearing.

Since the hermetically sealed thrust ball bearing of the present invention is constructed and assembled as described above, the adhesive strength does not decrease even if rust-proof plating is applied to each race, and press molding is performed. The rubber seal material does not flow to the raceway surface even if distortion occurs due to subsequent quenching. In particular, in this sealed thrust ball bearing, the lip portion 42a of the rubber seal 42 of the elastic seal member 4 fitted in the cylindrical portion 12 of the first race 1 is bent at the second race 2. The lip portion 52a of the rubber seal 52 of the elastic seal material 5 which is closely attached to the outer side surface of the portion 23 and fitted into the cylindrical portion 22 of the second race 2 is bent in the first race 1. Since the outer surfaces of the parts 13 are closely contacted with each other, the sealing structure of each race and the lip part of the rubber seal can be strengthened to prevent the intrusion of muddy water, etc., and to the load from the vehicle side. However, it also acts to reduce the frictional force against the reaction force from the wheel side.

[0012]

[Effect of the device]

 Since the sealed thrust ball bearing of the present invention has the above-described configuration, the starting torque does not become heavy even when an axial load is applied to the bearing. Also, since the separation of each race and ball can be shared by both the elastic seal material on the inner peripheral part and the elastic seal material on the outer peripheral part, the rigidity of the lip part of the rubber seal is improved. There is no need to increase the size, and the starting torque does not become heavy due to this lip seal structure. Further, it is not necessary to form a sealing groove for fitting the seal lip on the second race, and a rubber seal that adheres to the first race is attached to the outer surface of the entire second race. -There are various effects such as the overall height can be held down by setting the lip lip.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a sealed thrust ball bearing according to the present invention.

FIG. 2 is an enlarged view of a P portion of FIG.

FIG. 3 is a partial cross-sectional view of a conventionally known sealed thrust ball bearing.

[Explanation of symbols]

1 first lace 2 second lace
Thousand balls 4, 5 Elastic seals 10, 20 Gap 12, 22 Cylindrical part 13, 23 Bending part 41, 51 Core bar 42, 52 Rubber seal 41a, 41b, 51a, 51b Flange 42a, 52a Rubber seal Lurip part

Claims (1)

[Scope of utility model registration request] 1. A first race, a second race, an appropriate number of rolling balls arranged between the raceways of these races, and the first race. In a sealed thrust ball bearing made of an elastic seal material for sealing the gap between the inner and outer peripheral portions of the first and second races, the inner peripheral portion of the first race is A cylindrical portion extending toward the second race and having an outer diameter smaller than the inner diameter of the second race is formed, and an outer peripheral portion of the second race extends toward the first race. In addition, a cylindrical portion having an inner diameter larger than the outer diameter of the first race is formed, and the first race is formed in a gap formed between an inner peripheral portion and an outer peripheral portion of each race. An elastic seal composed of a cylindrical core metal fitted to the outer periphery of the cylindrical portion and a rubber seal formed so that the lip portion is in close contact with the outer surface of the inner peripheral portion of the second race. And the second An elastic seal composed of a cylindrical cored bar fitted to the inner periphery of the cylindrical portion of the cloth and a rubber seal formed so that the lip portion is in close contact with the outer surface of the outer peripheral portion of the first race. A sealed thrust ball bearing, which is hermetically held by and.