JPH0972339A - Synthetic resin bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly allow thrust load and a radial load by combining synthetic resins having low sliding frictional resistance with each other, and prevent dust and the like from invading on a sliding surface. SOLUTION: A device is provided with a synthetic resin made lower case 20, a synthetic resin made upper case 30 which is assembled with the lower case 20, and a synthetic resin made thrust sliding bearing means 40 which is arranged between the upper case 20 and the lower case 30. In the upper case 30, a radial bearing part is formed between the inner circumferential surface of a cylindrical part 3a and the outer peripheral surface of the cylindrical part 22 of the lower case 20. The lower surface of an annular flange part 33 is faced to the cylindrical part 22 end surface of the lower case 20, and also an annular engaging hanging part 34 is elastically mounted on the annular engaging projection part 27 of the lower case 20 so as to assemble with the lower case 20. A thrust bearing means is arranged between surfaces where the annular recessed part 26 of the lower case 20 is faced and the annular wide width flange part 32 of the upper case 30 are faced to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin bearing, and more particularly to a synthetic resin bearing suitable for being incorporated in a strut suspension (McPherson type) in a four-wheeled vehicle.

[0002]

2. Description of the Related Art Generally, a strut suspension is mainly used for front wheels of a four-wheeled vehicle, and has a structure in which a coil spring is combined with a strut assembly having a hydraulic shock absorber built in an outer cylinder integrated with a main shaft. The suspension has a structure in which the axis of the coil spring is positively offset with respect to the axis of the strut so that the piston rod of the shock absorber built in the strut can smoothly slide, and the coil spring with respect to the axis of the strut. There is a structure in which the axes of are arranged on the same axis. In either structure, when the strut assembly rotates with the coil spring by steering operation, a bearing is arranged between the mounting member of the vehicle body and the upper spring seat of the coil spring to allow the rotation smoothly.

The bearing supports the vehicle body load (thrust load) and, at the same time, the radial load caused by the suspension structure, that is, in the former structure, the axis of the coil spring is offset from the axis of the strut. A mistake caused by the radial load generated by the restoring force of the coil spring in the axial direction of the strut even in a stationary state, and the manufacturing difficulty of arranging the axis of the strut and the axis of the coil spring on the same axis in the latter structure. The performance that allows the radial load generated by the alignment smoothly is required. Therefore, in order to satisfy the above-mentioned performance, a rolling bearing using balls or a sliding bearing made of synthetic resin has been conventionally used for the bearing.

However, the rolling bearing has a small swing,
There is a risk that the ball may be fatigue-damaged due to vibration load and the like, which makes it difficult to maintain smooth steering operation for a long period of time. Further, the synthetic resin slide bearing has a problem that the coefficient of friction is high and the steering operation is heavy compared with the above rolling bearing. Further, in any of the bearings, the problem that the steering operation is heavy due to the high frictional force of the dust seal made of a rubber elastic body that is mounted to prevent foreign matter such as dust from entering the bearing sliding surface, especially the synthetic The resin slide bearing has a problem that the steering operation is made heavier.

In order to solve the above-mentioned problems of the sliding bearing made of synthetic resin in the prior art, the present applicant has previously
Practical application Sho 61-133,931 (Actual fair 4-52488)
Proposed a synthetic resin thrust bearing that can prevent foreign matter such as dust from entering the sliding surface and prevent an increase in steering force during steering operation without using a dust seal made of a rubber elastic body.

The technique proposed in Japanese Utility Model Application No. 61-133931 (Japanese Utility Model Publication No. 4-52488) will now be described with reference to FIG. Synthetic resin thrust bearing A shown in FIG.
Is a synthetic resin lower case B and a synthetic resin upper case C
And a disk-shaped synthetic resin bearing piece D, and the synthetic resin lower case B has a cylindrical portion 2 having an insertion hole 1 on the inner surface thereof and a part 2a of the cylindrical portion projected on the outer peripheral surface of the cylindrical portion 2. And the annular wide flange portion 3 formed integrally with each other, the partial protruding portion of the cylindrical portion and the upper surface of the flange portion form an annular concave portion 4 and an annular engagement protruding portion provided on the outer peripheral edge of the flange portion. 5, the synthetic resin upper case C includes a disk-shaped flat portion 6, a circular hole 7 formed in a central portion of the flat portion, and an annular member integrally formed on an outer peripheral edge of the flat portion 6. The bearing piece D is provided with the lower surface thereof in sliding contact with the annular recess 4 of the lower case B.
In the lower case B, the upper case C elastically mounts the annular engaging hanging part 8 on the annular engaging protrusion 5 of the lower case B, and the elastic mounting part forms a sealing part by a labyrinth action to perform relative rotation. It is possible to combine.

[0007]

In the synthetic resin thrust bearing A having the above-described structure, as shown in FIG. 12, the piston rod R of the strut is inserted into the insertion hole 1 and the circular hole 7 to form the lower case B and The upper case C is attached to the outer peripheral surface of the piston rod R, the outer peripheral surface of the cylindrical portion 2 of the lower case B is fitted and fixed in the hole S1 of the upper spring seat S, and the lower surface of the annular wide flange portion 3 of the lower case B is set to the upper side. Spring seat S
Is disposed between the upper spring seat S and the vehicle body mounting member F by bringing the upper surface of the disk-shaped planar portion 6 of the upper case C into contact with the lower surface of the vehicle body mounting member F. .

The synthetic resin thrust bearing A arranged in this manner allows the relative rotation between the upper spring seat S and the vehicle body mounting member F to be smoothly carried out so that the steering operation can be carried out smoothly. However, when the above-mentioned radial load acts on the synthetic resin thrust bearing A arranged between the upper spring seat S and the vehicle body mounting member F, the radial load is the same as that of the cylindrical portion insertion hole 1 of the lower case B. Since it is allowed by the sliding contact with the piston rod R that inserts through, that is, the sliding contact between the synthetic resin and the metal, there is a problem that the sliding resistance is large and it is difficult to smoothly allow the sliding resistance. The present invention has been made in view of the above points, and it is possible to smoothly allow a thrust load and a radial load by a combination of synthetic resins having small sliding friction resistance, and use a dust seal made of a rubber elastic body. It is an object of the present invention to obtain a synthetic resin bearing that can prevent dust and the like from entering the bearing sliding surface without doing so.

[0009]

According to the present invention, the above-mentioned object is arranged between a lower case made of synthetic resin, an upper case made of synthetic resin combined with the lower case, and an upper case and a lower case. The lower case is provided with a thrust sliding bearing means made of synthetic resin, and the lower case has a cylindrical portion having an inner surface as a through hole, an annular wide flange portion extended to an outer peripheral surface of an end portion of the cylindrical portion, and the wide flange portion. An annular protrusion is formed on the upper surface of the cylindrical protrusion and an annular groove is erected, and an annular recess is formed by the annular protrusion and the upper surface of the wide flange, and the annular protrusion is erected on the outer peripheral edge of the wide flange. The upper case has a cylindrical portion, an annular wide brim portion extending on an outer peripheral surface of an end portion of the cylindrical portion, and a radially inner portion extending to the other end of the cylindrical portion. And an annular engaging hanging portion that hangs down on the outer peripheral edge of the wide flange portion, and the upper case is A radial bearing portion is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the cylindrical portion of the lower case, the lower surface of the annular collar portion faces the end surface of the cylindrical portion of the lower case, and the annular engaging hanging portion of the lower case is formed. The thrust sliding bearing means is elastically mounted on the annular engaging projection and combined with the lower case, and the thrust slide bearing means is disposed between the facing surfaces of the annular recess of the lower case and the annular wide flange of the upper case. Achieved by

Further, in the above construction, the lower case further comprises an outer annular protruding portion which is erected on the upper surface of the annular wide brim portion so as to stand upright with the annular engaging protruding portion and an annular groove formed radially inward. The upper case further includes an annular hanging portion formed on the lower surface of the annular wide collar portion and an annular hanging portion formed by forming an annular groove on the inner side in the radial direction. A radial bearing portion is formed between the outer peripheral surface of the cylindrical portion of the lower case, the lower surface of the annular collar portion faces the end surface of the cylindrical portion of the lower case, and the end portion of the annular hanging portion of the outer annular protruding portion of the lower case. The end portion is engaged with the end portion in the radial direction so as to be overlapped with each other, and the annular engagement hanging portion is elastically attached to the annular engagement protrusion of the lower case to be combined with the lower case, and the overlapping portion is provided with a labyrinth action. Synthetic resin bearing with a sealed part It is also possible to.

Further, according to the present invention, the above object is to provide a lower case made of synthetic resin, an upper case made of synthetic resin combined with the lower case, and a synthetic resin arranged between the upper and lower cases. The lower case is provided with a thrust slide bearing means, and the lower case has a cylindrical portion having an inner surface as a through hole, an annular wide collar portion extending on an outer peripheral surface of an end portion of the cylindrical portion, and an outer peripheral surface of the cylindrical portion. A cylindrical wall portion extending downward through a radial annular shoulder portion, and an annular protrusion portion and an annular protrusion portion that are erected by forming the cylindrical wall portion and the annular groove on the upper surface of the wide flange portion. An annular recess is formed with the upper surface of the wide brim portion and an annular engaging protrusion is provided upright on the outer peripheral edge of the wide brim portion, and the upper case has a cylindrical portion and an end portion of the cylindrical portion. An annular wide brim portion extended to the outer peripheral surface, an annular brim portion radially inwardly extended to the other end of the cylindrical portion, and the cylindrical portion An inner annular hanging portion that extends downwardly on the inner peripheral surface via a radially enlarged annular shoulder portion and hangs on the lower surface of the wide collar portion, and an annular engaging hanging portion that hangs on the outer peripheral edge of the wide collar portion. The upper case has a radial bearing portion formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the cylindrical portion of the lower case,
The lower surface of the annular collar portion faces the end surface of the cylindrical portion of the lower case, the enlarged diameter annular shoulder portion faces the enlarged diameter shoulder portion of the lower case, and the end portion of the inner annular hanging portion of the annular protrusion portion of the lower case faces. The end portion is engaged with the end portion in an overlapping manner in the radial direction thereof, and the annular engaging hanging portion is elastically attached to the annular engaging protrusion portion of the lower case, and a sealing portion by a labyrinth action is formed in the overlapping portion to form the lower case. The thrust slide bearing means can also be achieved by a synthetic resin bearing arranged between the facing surfaces of the annular recess of the lower case and the annular wide flange of the upper case.

Further, in the above construction, the lower case further comprises an outer annular protruding portion which is erected on the upper surface of the annular wide brim portion so as to stand upright with the annular engaging protruding portion and an annular groove formed radially inward. The upper case further includes an annular hanging portion formed on the lower surface of the annular wide flange portion and an annular hanging portion that is formed by forming an annular groove on the inner side in the radial direction. A radial bearing portion is formed between the outer peripheral surface of the cylindrical portion of the lower case, the lower surface of the annular collar portion is the end surface of the cylindrical portion of the lower case, and the expanded radial shoulder portion is the expanded annular shoulder portion of the lower case. The end portions of the inner annular hanging portion and the end portions of the annular hanging portion of the lower case and the end portions of the outer annular protruding portion of the lower case are overlapped in the radial direction, respectively. The lower part of the lower case with the annular engaging hanging part. Elastically is attached to the engagement projecting portion are combined in said lower case, it may be a synthetic resin bearing which is formed by forming a seal by the labyrinth effect on the superposition unit.

The thrust slide bearing means is an annular thrust bearing body formed separately between the annular concave portion of the lower case and the annular wide flange portion of the upper case facing each other, with respect to the annular concave portion and the annular wide flange portion. Or an annular thrust bearing portion integrally formed on the lower surface of the annular wide flange portion of the upper case between the facing surfaces of the annular concave portion of the lower case and the annular wide flange portion of the upper case.

The synthetic resin constituting the upper and lower cases in the synthetic resin bearing of the present invention is preferably excellent in sliding characteristics such as abrasion resistance, impact resistance and creep resistance, and mechanical characteristics. The synthetic resin forming the thrust slide bearing means arranged between the upper and lower cases preferably has self-lubricating property, and examples thereof include polyacetal resin, polyamide resin, thermoplastic polyester resin such as polybutylene terephthalate (PBT), and polyethylene. Polyolefin resins such as polypropylene and the like are preferably used.

For the upper and lower cases, a synthetic resin similar to the synthetic resin forming the thrust slide bearing means is used, but particularly with a combination of the synthetic resin used for the thrust slide bearing means and a sliding friction characteristic. It is desirable that the synthetic resin has a relatively high rigidity. As an example of the desirable combination, a polyacetal resin is used for the upper case and a polyamide resin is used for the lower case.
A combination of using a polyolefin resin for the thrust sliding bearing means, a polyacetal resin for the upper case and a polyamide resin for the lower case, which has an annular thrust bearing portion integrally formed on the lower surface of the annular wide collar of the upper case as the thrust sliding bearing means. Alternatively there is a combination using PBT.

The synthetic resin bearing of the present invention is a strut type suspension (McPherson type) in a four-wheeled vehicle.
It is used by being installed between the mounting member of the vehicle body and the upper spring seat of the strut assembly. When the strut assembly is rotated by the steering operation, the lower case is rotated with respect to the upper case, and the lower case is rotated by the thrust slide bearing means made of synthetic resin arranged between the upper and lower cases. It is allowed smoothly and steering operation is performed smoothly. Even when a radial load is applied to the synthetic resin bearing,
The radial load is smoothly allowed by the sliding contact between the synthetic resins in the radial bearing portion formed between the outer peripheral surface of the cylindrical portion of the upper case and the inner peripheral surface of the cylindrical portion of the lower case.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described in more detail based on a preferred embodiment shown in the drawings. The invention is in no way limited to these examples.

[0018]

EXAMPLE Referring to FIG. 1, a synthetic resin bearing 10 of this example is
A lower case 20 made of synthetic resin, an upper case 30 made of synthetic resin combined with the lower case, and thrust slide bearing means 40 made of synthetic resin arranged between the upper and lower cases are provided.

The lower case 20 has a cylindrical portion 22 having an inner surface 21 as an engaging hole, an annular wide flange portion 23 extending from an outer peripheral surface of an end portion of the cylindrical portion 22, and an upper surface of the annular wide flange portion 23. An annular projecting portion 2 formed upright by forming a cylindrical portion 22 and an annular groove 24.
5 and the annular protrusion 25 and the upper surface of the annular wide flange portion, an annular recess 26 is formed, and an annular engagement protrusion 27 is provided upright on the outer peripheral edge of the wide flange portion 23. The annular engaging protrusion 2
Reference numeral 7 denotes a taper surface portion that is inclined outward from the end of the protrusion 27 and is continuous with the taper surface portion on the outer peripheral surface thereof, and forms an annular convex corner portion and is continuous with the outer peripheral surface of the wide brim portion 23. An engaging portion 28 formed of a tapered surface portion is provided.

The upper case 30 includes a cylindrical portion 31, an annular wide brim portion 32 extending from an outer peripheral surface of an end portion of the cylindrical portion 31, and an annular flange extending radially inward from the other end of the cylindrical portion 31. Part 33
And an annular engaging hanging portion 3 that hangs on the outer peripheral edge of the wide brim portion 32.
It is equipped with 4. On the inner peripheral surface of the annular engaging hanging portion 34, a taper surface portion that inclines outward from the base portion and a taper surface portion that is continuous with the taper surface portion and forms an annular concave corner portion and is connected to the lower end of the hanging portion 34. And an engaging hook portion 35 composed of

The upper case 30 has a radial bearing portion formed between the inner peripheral surface of the cylindrical portion 31 and the outer peripheral surface of the cylindrical portion 22 of the lower case 20, and the lower surface of the annular collar portion 33 is the cylindrical portion of the lower case 20. The engaging hook portion 35 of the annular engaging hanging portion 34 is elastically attached to the engaging portion 28 of the annular engaging protrusion 27 of the lower case 20 so as to face the end surface of the portion 22 and is combined with the lower case 20. . Between the upper and lower cases 30 and 20 combined in this way, from the outside, the elastic mounting portion on the outer peripheral side and the lower surface of the annular collar portion 33 on the inner peripheral side and the end surface of the cylindrical portion 22 of the lower case 20 face each other. A sealing portion is formed to prevent foreign matter such as dust from entering the bearing sliding surface.

The thrust slide bearing means 40 is formed in the space between the annular recess 26 of the lower case 20 and the lower surface of the annular wide flange 32 of the upper case 30 facing the annular recess 26 and the bottom surface of the annular recess 26 and the annular recess 26. It is slidably arranged on the lower surface of the wide flange 32, has an inner diameter larger than the outer diameter of the annular protrusion 25 of the lower case 20, and has an annular engagement protrusion 27.
Annular thrust bearing body 41 having an outer diameter smaller than the inner diameter of
Consists of On both end surfaces of the bearing body 41, ring grooves 42 are formed on the inner peripheral edges thereof, and the ring grooves 4 are formed.
A plurality of radial grooves 43 opening from 2 to the outer diameter side are formed at equal intervals in the circumferential direction and with a phase difference of 30 degrees. The ring groove 42 and the radial groove 43 serve as a reservoir for a lubricant such as grease.

FIG. 3 shows another specific example. In FIG. 3, the synthetic resin bearing 10 of the present example is the same as the synthetic resin bearing described above, except that the annular wide collar portion 23 of the lower case 20 has an annular shape on the upper surface thereof. The engaging protrusion 27 and an outer annular protrusion 25a which is provided upright by forming an annular groove 29 on the inner side in the radial direction are further provided, and the upper case 30 is provided on the lower surface of the annular wide flange 32. The lower part of the hanging part 34 and the annular groove 36 on the radially inner side
It further comprises an annular hanging part 37 that forms and hangs. Further, the upper case 30 has a radial bearing portion formed between the inner peripheral surface of the cylindrical portion 31 and the inner peripheral surface of the cylindrical portion 22 of the lower case 20, and the lower surface of the annular collar portion 33 is formed on the lower case 20. The end portion of the annular hanging portion 37 is overlapped with the end portion of the outer annular protruding portion 25a of the lower case 20 in the radial direction so as to face the end surface of the cylindrical portion 22, and a sealing portion by a labyrinth action is formed in the overlapping portion. While engaging with each other, the engaging hook portion 35 of the annular engaging hanging portion 34 is elastically attached to the engaging portion 28 of the annular engaging protruding portion 27 of the lower case 20 so that the lower case 2
It is associated with 0.

Between the upper and lower cases 30 and 20 combined in this way, the elastic mounting portion, the end of the annular hanging portion 37, and the end of the outer annular protruding portion 25a of the lower case 20 are provided on the outer peripheral side thereof. A sealing portion formed by the labyrinth action is formed in the overlapping portion of the ring collar portion 33 and the annular collar portion 33 is formed on the inner peripheral side thereof.
A sealing portion is formed on a surface of the lower case facing the end surface of the cylindrical portion 22 of the lower case 20, and these sealing portions prevent dust and the like from entering the bearing sliding surface from the outside.

The synthetic resin bearing 10 thus constructed
Are assembled into the strut assembly shown in FIG.
That is, the bearing 10 has the inner surface 2 of the cylindrical portion of the lower case 20.
1 is fitted to the outer peripheral surface of the cylindrical projecting portion S1 of the upper spring seat S of the strut assembly, and the lower surface of the annular wide flange 23 is seated on the flat surface S2 of the upper spring seat S, so that the upper case 30 The cylindrical portion 31 is fitted into the hole F1 of the vehicle body side mounting member F, and the upper surface of the annular wide flange portion 32 of the upper case 30 is brought into contact with the lower surface of the vehicle body side mounting member F to mount the upper spring seat S and the vehicle body side. It is arranged between the member F and the member F. In FIG. 4, reference symbol R indicates a piston rod of the strut assembly, and reference symbol B indicates a coil spring.

When a radial load due to the structure of the suspension acts on the synthetic resin bearing 10 arranged between the upper spring seat S and the vehicle body side mounting member F, the radial load is applied to the cylinder of the upper case 30. The radial bearing portion formed by holding the bearing gap between the inner peripheral surface of the portion 31 and the outer peripheral surface of the cylindrical portion 22 of the lower case 20 is allowed smoothly by the sliding of the synthetic resins. Also, the body weight is
The annular recess 26 of the lower case 20, the lower surface of the annular wide flange portion 32 of the upper case 30 facing the annular recess 26, the bottom surface of the annular recess 26, and the annular bottom surface of the annular wide flange portion 32 which are slidably arranged. The thrust load is supported by the thrust bearing body 41, and the thrust load is smoothed by the sliding of the synthetic resin between the annular recess 25 of the lower case 20, the annular thrust bearing body 41 and the lower surface of the annular wide flange 32 of the upper case 30. Permissible.

FIG. 5 shows another specific example. The synthetic resin bearing 10 of this example is the same as the synthetic resin bearing shown in FIG. 1 described above, but the lower case 20 has an expanded ring shape on the outer peripheral surface of the cylindrical portion 22. Cylindrical wall portion 2 extending downward through the shoulder portion 22a
2b, the annular protruding portion 25 forms the cylindrical wall portion 22b and the annular groove 24, and is erected on the upper surface of the wide brim portion 23. The upper case 30 has a cylindrical portion 31.
An inner annular hanging portion 3 extending downward on the inner peripheral surface of the inner peripheral surface of the wide flange portion 32 via an enlarged annular shoulder portion 31a and hanging on the lower surface of the wide flange portion 32.
7a is further provided. A radial bearing portion is formed between the inner peripheral surface of the cylindrical portion 31 of the upper case 30 and the outer peripheral surface of the cylindrical portion 22 of the lower case 20, and the lower surface of the annular flange 33 is attached to the end surface of the cylindrical portion 22 of the lower case 20. And the enlarged annular shoulders 31a face the enlarged annular shoulders 22a of the lower case 20, respectively, and the end of the inner annular hanging portion 37a and the end of the annular protrusion 25 of the lower case 20 and the radial direction thereof. And the engaging portion 3 of the annular engaging hanging portion 34.
5 is elastically attached to the engaging hook portion 28 of the annular engaging protrusion 27 of the lower case 20, and a sealing portion by a labyrinth action is formed in the overlapping portion to be combined with the lower case 20. Upper and lower case 3 combined in this way
Between 0 and 20, the elastic mounting portion on the outer peripheral side, the lower surface of the annular collar portion 33 on the inner peripheral side, the facing portion of the end surface of the cylindrical portion 22 of the lower case 20, the end portion of the inner annular hanging portion 37a, and the lower case 2
A sealing portion for preventing foreign matter such as dust from entering the bearing sliding surface from the outside is formed in a portion overlapping with the end portion of the annular protrusion 25 of 0.

FIG. 6 shows still another specific example. The synthetic resin bearing 10 of this example is the same as the synthetic resin bearing shown in FIG. 5 except that the lower case 20 is formed on the upper surface of the annular wide collar portion 23. The engagement case 27 further includes an outer annular projection 25a that is provided upright by forming an annular groove 29 on the inner side in the radial direction, and the upper case 20 is provided on the lower surface of the annular wide flange 32 with the annular engagement. The lower part of the hanging part 34 and the annular groove 36 on the radially inner side
It further comprises an annular hanging part 37 that forms and hangs. Further, the upper case 30 has a radial bearing portion formed between the inner peripheral surface of the cylindrical portion 31 and the inner peripheral surface of the cylindrical portion 22 of the lower case 20, and the lower surface of the annular collar portion 33 is formed on the lower case 20. The end portion of the annular hanging portion 37 is overlapped with the end portion of the outer annular protruding portion 25a of the lower case 20 in the radial direction so as to face the end surface of the cylindrical portion 22, and a sealing portion by a labyrinth action is formed in the overlapping portion. While engaging with each other, the engaging hook portion 35 of the annular engaging hanging portion 34 is elastically attached to the engaging portion 28 of the annular engaging protruding portion 27 of the lower case 20 so that the lower case 2
It is associated with 0.

Between the upper and lower cases 30 and 20 thus combined, the elastic mounting portion, the end of the annular hanging portion 37 and the outer annular protrusion 2 of the lower case 20 are provided on the outer peripheral side thereof.
A sealing portion formed by a labyrinth action is formed in an overlapping portion with the end portion of 5a, and the inner peripheral surface of the annular flange 33 faces the lower surface of the lower collar case 20 and the end surface of the cylindrical portion 22 of the lower case 20. A sealing portion by a labyrinth action is formed at an overlapping portion of an end portion of the portion 37a and an end portion of the annular protruding portion 25 of the lower case 20 to prevent dust and the like from entering the bearing sliding surface from the outside. There is.

By the way, in the specific examples shown in FIGS. 1, 3, 5 and 6, the annular recess 2 of the lower case 20 is used.
4 and the lower surface of the annular wide flange portion 33 of the upper case 30 facing the annular recess 24, the annular thrust bearing body 4
The thrust sliding bearing means 40 consisting of
Instead of this, as shown in FIGS. 7 to 10, the thrust slide bearing means 40 is integrally formed on the lower surface of the annular wide flange portion 32 of the upper case 30, and is smaller than the outer diameter of the annular protruding portion 25 of the lower case 20. It may be composed of an annular thrust bearing protrusion 44 having a large inner diameter and an outer diameter smaller than the inner diameter of the annular engagement protrusion 27 or the outer annular protrusion 25a. In the structure of the synthetic resin bearing 10 shown in FIGS. 7 to 10, the structure other than the thrust slide bearing means 40 is the same as the structure shown in FIGS. 1, 3, 5, and 6 described above.

In the synthetic resin bearing 10 shown in FIGS. 7 to 10, the thrust load is allowed by sliding between the end face of the annular thrust bearing projection 44 and the bottom face of the annular recess 25 of the lower case 20. In this case, a ring groove and a radial groove are formed on the end surface of the annular thrust bearing protrusion 44.

[0032]

According to the synthetic resin bearing of the present invention, even when a radial load due to the structure of the suspension acts, the radial load is applied between the outer peripheral surface of the cylindrical portion of the upper case and the inner peripheral surface of the cylindrical portion of the lower case. It is allowed smoothly by the sliding of the synthetic resin in the radial bearing portion formed by holding the bearing gap.

[Brief description of drawings]

FIG. 1 is a sectional view of a synthetic resin bearing of the present invention.

FIG. 2 is a plan view of a thrust slide bearing body in the synthetic resin bearing shown in FIG.

FIG. 3 is a cross-sectional view showing still another specific example of the synthetic resin bearing of the present invention.

FIG. 4 is a cross-sectional view showing a state where the synthetic resin bearing shown in FIG. 3 is incorporated in a strut assembly.

FIG. 5 is a cross-sectional view showing another specific example of the synthetic resin bearing of the present invention.

FIG. 6 is a sectional view showing another specific example of the synthetic resin bearing of the present invention.

FIG. 7 is a cross-sectional view showing another specific example of the synthetic resin bearing of the present invention.

FIG. 8 is a sectional view showing another specific example of the synthetic resin bearing of the present invention.

FIG. 9 is a cross-sectional view showing another specific example of the synthetic resin bearing of the present invention.

FIG. 10 is a cross-sectional view showing another specific example of the synthetic resin bearing of the present invention.

FIG. 11 is a sectional view of a conventional synthetic resin bearing.

12 is a cross-sectional view showing a state where the synthetic resin bearing shown in FIG. 11 is incorporated in a strut assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Synthetic resin bearing 20 Lower case 21 Inner surface 22 Cylindrical part 23 Annular wide flange 25 Annular protrusion 26 Annular recess 27 Annular engagement protrusion 30 Upper case 31 Cylindrical part 32 Annular wide flange 33 Annular flange 34 Annular engagement drop Part 40 Thrust slide bearing means 41 Annular thrust bearing body

Claims (6)

[Claims] 1. A lower case made of synthetic resin, an upper case made of synthetic resin combined with the lower case, and thrust slide bearing means made of synthetic resin arranged between the upper and lower cases. In the lower case, a cylindrical portion having an inner surface as a through hole, an annular wide brim portion extended to an outer peripheral surface of an end portion of the cylindrical portion, and the cylindrical portion and an annular groove are formed on an upper surface of the wide brim portion. An annular protrusion that is provided upright, an annular recess formed by the annular protrusion and the upper surface of the wide flange, and an annular engagement protrusion that is provided upright on the outer peripheral edge of the wide flange. The upper case includes a cylindrical portion, an annular wide brim portion extending on an outer peripheral surface of an end portion of the cylindrical portion, an annular brim portion radially inwardly extended to the other end of the cylindrical portion, and an outer peripheral edge of the wide brim portion. The upper case has an inner peripheral surface of a cylindrical portion and an outer peripheral surface of the cylindrical portion of the lower case. Form a radial bearing between
The lower surface of the annular flange portion faces the end surface of the cylindrical portion of the lower case, and the annular engaging hanging portion is elastically attached to the annular engaging protrusion of the lower case so as to be combined with the lower case. A synthetic resin bearing, characterized in that it is arranged between the facing surfaces of the annular recess of the lower case and the annular wide flange of the upper case. 2. The lower case further includes an outer annular protrusion that is provided upright on the upper surface of the annular wide flange portion and has an annular groove formed radially inward with the annular engaging protrusion, and the upper case. Is further provided on the lower surface of the annular wide collar portion with the annular engaging hanging portion and an annular hanging portion that hangs by forming an annular groove radially inward, and the upper case has an inner peripheral surface of the cylindrical portion and a cylinder of the lower case. A radial bearing portion is formed between the outer peripheral surface of the lower case and the lower surface of the annular flange facing the end surface of the cylindrical portion of the lower case, and the end of the annular hanging portion and the end of the outer annular protrusion of the lower case. The annular engaging hanging portion is elastically mounted on the annular engaging protruding portion of the lower case and is engaged with the lower case by superposing in the radial direction, and the sealing portion is formed by the labyrinth action in the overlapping portion. The synthetic resin bearing according to claim 1. 3. A lower case made of synthetic resin, an upper case made of synthetic resin combined with the lower case, and thrust slide bearing means made of synthetic resin arranged between the upper and lower cases. The lower case has a cylindrical portion having an inner surface as a through hole, an annular wide brim portion extended to an outer peripheral surface of an end portion of the cylindrical portion, and an outer peripheral surface of the cylindrical portion downwardly through a radially enlarged annular shoulder portion. An annular protrusion formed by extending the cylindrical wall portion and the upper surface of the wide flange portion with the cylindrical wall portion and an annular groove formed upright, the annular protrusion portion, and the upper surface of the wide flange portion. The upper case is provided with an annular engagement protrusion that is formed to stand on the outer peripheral edge of the wide flange portion, and the upper case has a cylindrical portion and an annular wide portion that extends on the outer peripheral surface of the end of the cylindrical portion. An annular collar portion extending inward in the radial direction at the other end of the collar portion and the cylindrical portion, and a lower portion on the inner peripheral surface of the cylindrical portion via a radially enlarged annular shoulder portion. An inner annular hanging part that is hung on the lower surface of the wide brim part and an annular engaging hanging part that hangs on the outer peripheral edge of the wide brim part, and the upper case has an inner peripheral surface of the cylindrical part and A radial bearing portion is formed between the outer peripheral surface of the cylindrical portion of the lower case, the lower surface of the annular collar portion faces the cylindrical end surface of the lower case, and the enlarged diameter annular shoulder portion faces the enlarged diameter annular shoulder portion of the lower case. The end portion of the inner annular hanging portion is engaged with the end portion of the annular protruding portion of the lower case so as to overlap with the end portion in the radial direction, and the annular engaging hanging portion is elastically attached to the annular engaging protrusion portion of the lower case. And a sealing portion by a labyrinth action is formed in the overlapping portion and is combined with the lower case, and the thrust slide bearing means is disposed between the facing surfaces of the annular recess of the lower case and the annular wide flange portion of the upper case. A synthetic resin bearing characterized in that 4. The lower case further comprises an outer annular protrusion that is erected on the upper surface of the annular wide collar portion and has an annular groove formed radially inward with the annular engaging protrusion, and the upper case. Is further provided on the lower surface of the annular wide collar portion with the annular engaging hanging portion and an annular hanging portion that hangs down by forming an annular groove on the inner side in the radial direction, and the upper case has an inner peripheral surface of the cylindrical portion and the lower case. A radial bearing portion is formed between the outer peripheral surface of the cylindrical portion, the lower surface of the annular collar portion faces the end portion of the cylindrical portion of the lower case, and the enlarged radial shoulder portion faces the enlarged annular shoulder portion of the lower case. The end portion of the annular hanging portion is engaged with the end portion of the annular protruding portion of the lower case, and the end portion of the annular hanging portion is engaged with the end portion of the outer annular protruding portion of the lower case so as to overlap each other in the radial direction. At the same time, the annular engagement hanging part is elastically attached to the annular engagement protrusion of the lower case. 4. The synthetic resin bearing according to claim 3, wherein the synthetic resin bearing is combined with the lower case, and a sealing portion is formed in the overlapping portion by a labyrinth action. 5. The thrust slide bearing means is an annular thrust bearing formed separately between the annular concave portion of the lower case and the annular wide flange portion of the upper case facing each other, with respect to the annular concave portion and the annular wide flange portion. The synthetic resin bearing according to any one of claims 1 to 4, which comprises a body. 6. The thrust bearing means comprises an annular thrust bearing portion integrally formed on the lower surface of the annular wide flange portion of the upper case between the facing surfaces of the annular concave portion of the lower case and the annular wide flange portion of the upper case. The synthetic resin bearing according to any one of claims 1 to 4.