JP2593088Y2 - Synthetic resin thrust bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a synthetic resin thrust bearing which is disposed between two relatively rotating objects to allow the rotation smoothly, specifically, a strut type suspension (MacPherson type) of a four-wheeled vehicle. And a suitable synthetic resin thrust bearing.

[0002]

2. Description of the Related Art In general, a strut type suspension is mainly used for a front wheel of a four-wheeled vehicle and is a suspension 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 includes a type in which the piston rod of the assembly rotates when the strut assembly rotates together with the coil spring by the steering operation, and a type in which the piston rod does not rotate. A bearing is required between the mounting member of the vehicle body and the upper spring seat of the coil spring in order to allow smoothness.

Conventionally, a rolling bearing using a ball or a needle or a sliding bearing made of synthetic resin has been used as the bearing at this location. However, in conventional synthetic resin plain bearings, a dust seal made of a rubber elastic body is mounted on the outer peripheral surface of the plain bearing for the purpose of preventing dust or the like from entering the sliding surface. Are arranged in close sliding contact between the rotating sliding surfaces, so that there is a drawback that the sliding friction force is high and the steering force is increased during the steering operation. In order to solve the drawbacks of the synthetic resin plain bearing in the prior art, the present applicant has previously filed Japanese Utility Model Application No. 61-133931 (Japanese Utility Model Application No. 4-52488; hereinafter, referred to as "prior art").
Proposed a synthetic resin thrust bearing which can prevent dust and the like from entering a sliding surface without using a dust seal made of a rubber elastic body and can prevent an increase in steering force at the time of steering operation. This prior art synthetic resin thrust bearing is composed of a synthetic resin upper and lower case and a synthetic resin bearing piece disposed in the upper and lower cases, and the upper case is resiliently mounted on the outer peripheral surface of the lower case and combined therewith. And a sealing portion formed by a labyrinth action in the elastic mounting.

[0004]

The synthetic resin thrust bearing according to the prior art described above prevents an increase in steering force at the time of steering operation, which is a drawback of the conventional synthetic resin plain bearing, and provides a smooth steering force. Can be maintained over a long period of time. However, since the spring force and the like of the coil spring constituting the strut type suspension into which the thrust bearing is incorporated differs depending on the vehicle type, the synthetic resin forming the lower case and the synthetic resin forming the lower case and the upper case depend on the vehicle type in which the thrust bearing is incorporated. ,
In the combination with the synthetic resin forming the bearing piece disposed in the lower case, friction variation is caused between the upper case and the bearing piece or between the lower case and the bearing piece, and the friction variation causes a smooth change. The problem of changing the steering feeling (feeling) was raised. Therefore, the present inventors have conducted further experiments on the cause of the friction fluctuation, and as a result, by using a synthetic resin having lower rigidity than the synthetic resin forming the upper and lower cases for the bearing piece, the friction fluctuation was reduced. It has been found that a smooth steering feeling can be maintained without causing a problem. However, bearings made of synthetic resin with low rigidity are inferior in creep resistance, causing creep in bearings over time, making it difficult to allow relative rotation between the upper and lower bearing cases smoothly. Issues were raised. The present inventors have found out that the above-mentioned problems can be solved by adopting a configuration capable of minimizing the occurrence of creep based on the above findings, in view of the advantages of the prior art, and led to the present invention. SUMMARY OF THE INVENTION The present invention relates to an improvement of the prior art, and an object of the present invention is to provide a synthetic resin thrust bearing capable of maintaining a smooth steering feeling without causing frictional fluctuation.

[0005]

According to the present invention, there is provided a cylindrical portion having an insertion hole on an inner surface thereof, and a wide annular flange portion extending radially outward on an outer peripheral surface of a lower end of the cylindrical portion. extends upwardly to the outer peripheral edge of the annular flange portion, said cylindrical portion and the annular flange portion annular projection defining an annular recess in the upper surface and the engaging portion formed on an outer circumferential surface of the annular projection and the annular A synthetic resin lower bearing case having an annular concave groove formed on the bottom surface of the concave portion,
A synthetic resin bearing body embedded with the one end face of the annular groove protruding from the opening of the annular groove, a cylindrical block part, and a diameter formed on the inner peripheral surface at the upper end of the cylindrical block part. An inner annular flange portion extending inward in the direction, an outer annular flange portion extending radially outward on the outer peripheral surface at the upper end of the cylindrical block portion, and a downwardly extending outer peripheral edge of the outer annular flange portion. , the cylindrical block portion outer peripheral surface and the outer annular flange portion lower surface with a synthetic resin top with an annular suspended portion and the engaging hook portion formed on the inner peripheral surface of the annular suspended portion defining an annular groove in the A bearing case, wherein the upper bearing case slides the lower surface of the cylindrical block portion against a protruding end surface of the bearing body embedded in an annular groove of the lower bearing case, and has an engagement hook portion of an annular hanging portion. Is elastically attached to the engagement portion of the annular projection of the lower bearing case, and a rabble is attached to the elastic attachment portion. The bearing is formed by a synthetic resin thrust bearing formed of a synthetic resin having a lower rigidity than the synthetic resin forming the upper and lower bearing cases.

Further, according to the present invention, the object is to provide a cylindrical portion having an insertion hole in the inner surface, a wide annular flange portion extending radially outward on the outer peripheral surface of the lower end of the cylindrical portion, and the annular flange portion. of extending upwardly to the outer peripheral edge, the cylindrical portion and the annular flange portion upper surface and made of synthetic resin and an annular projection and the engaging portion formed on an outer circumferential surface of the annular projecting portion defining an annular recess A lower bearing case, a cylindrical block portion, an inner annular flange portion extending radially inward on an inner peripheral surface of an upper end of the cylindrical block portion, and a radially outwardly extending outer circumferential surface of an upper end of the cylindrical block portion. extended downward the outer annular flange portion and the outer peripheral edge of the annular flange portion, an annular depending portion defining an annular groove in the lower surface of the outer peripheral surface and the outer annular flange portion of said cylinder block portion and the annular suspended portion Having an engaging hook portion formed on the inner peripheral surface of the cylinder and an annular groove formed on the lower surface of the cylindrical block. A fat made upper bearing case, is embedded in one end face is protruded from the opening of the annular groove in the annular groove, the upper, having a low synthetic resin rigidity than synthetic resin for forming the lower bearing case is a synthetic resin bearing member has made, the upper bearing case is sliding contact with the protruding end face of the bearing body embedded in the annular groove of the cylindrical block lower surface to the bottom surface of the annular recess of the lower bearing case At the same time, a synthetic resin thrust bearing is formed by elastically attaching the engaging hook portion of the annular hanging portion to the engaging portion of the annular projecting portion of the lower bearing case and forming a sealing portion by a labyrinth action on the elastic attaching portion. Is also achieved.

In the synthetic resin thrust bearing having the above-described structure, the synthetic resin bearing body is formed of a disk having a circular hole in a central portion, and one end face of the disk is formed with an opening of an annular groove. It is buried in the annular groove so as to protrude further. Further, in another aspect, the synthetic resin bearing body includes a disk-shaped portion having a circular hole at a central portion, and an annular flange portion extending on an outer peripheral surface of one end portion of the disk-shaped portion. And the annular flange is projected from the annular groove, and the disc-shaped portion is arranged to be embedded in the annular groove. Further, in the synthetic resin thrust bearing, as the synthetic resin forming the upper and lower bearing cases, polyacetal resin and polyamide resin are recommended,
The synthetic resin forming the bearing body is formed of a synthetic resin having lower rigidity than the synthetic resin forming the upper and lower bearing cases, and is made of a polyolefin resin, for example, a high molecular weight or ultra-high molecular weight polyethylene resin, a fluororesin, for example, Ethylene fluoride resin or ethylene tetrafluoride / propylene hexafluoride copolymer is recommended.

[0008]

The bearing body made of synthetic resin is formed of a synthetic resin having a lower rigidity than the synthetic resin forming the upper and lower bearing cases, and one end face of the bearing body has an annular shape of the lower bearing case made of synthetic resin. It is embedded in an annular groove formed in the concave portion or an annular groove formed on the lower surface of the cylindrical block portion of the synthetic resin upper bearing case, and the other end face is opened in the annular groove.
Since it is arranged so as to protrude from the portion, the open surface of the bearing body, in other words, the outer peripheral surface of the protruding portion protruding from the opening of the annular groove can be made as small as possible. Sex is enhanced. Thus, relative rotation between the upper bearing case and the lower bearing case through the bearing body creep resistance is increased, the friction between the bearing body and the upper bearing casing or the bearing member and said lower bearing case The combination of the synthetic resins having excellent wear characteristics allows the two to be smoothly allowed without causing frictional fluctuation between them, and maintains a smooth steering feeling over a long period of time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing an embodiment thereof. 1 to 3 show a first embodiment. The synthetic resin thrust bearing 1 includes a synthetic resin lower bearing case 2, a synthetic resin upper bearing case 3, and a synthetic resin bearing body 4 fixed to the lower bearing case 2. The lower bearing case 2 includes a cylindrical portion 22 having an insertion hole 21 on an inner surface thereof, a wide annular flange portion 23 extending radially outward on an outer peripheral surface of a lower end of the cylindrical portion 22, and an outer portion of the annular flange portion 23. An annular protruding portion 25 extending upward at a peripheral edge and defining an annular recess 24 by the cylindrical portion 22 and the upper surface of the annular flange portion; an engaging portion 26 formed on an outer peripheral surface of the annular protruding portion 25; 2
4 has an annular groove 28 formed in the bottom surface 27. Projections 29 are formed on the lower surface of the annular flange portion 23 so as to face each other in the radial direction, and the projections 29 play a role in positioning when the synthetic resin thrust bearing 1 described later is assembled and fixed to the strut assembly. The annular protrusion 2
The engagement portion 26 formed on the outer peripheral surface of the annular protrusion 5
5 has a tapered surface 26 extending outward from the outer peripheral end.
a and a tapered surface portion 26b which is continuous with the tapered surface portion 26a, converges inward and continues to the outer peripheral cylindrical surface of the annular flange portion 23.

The upper bearing case 3 has a cylindrical block 3
1, an inner annular flange portion 32 extending radially inward on the inner peripheral surface at the upper end of the cylindrical block portion 31, and an outer annular flange portion extending radially outward on the outer peripheral surface at the upper end of the cylindrical block portion 31 Part 33
And an annular groove 34 extending downwardly from the outer peripheral edge of the outer annular flange 33 to the outer peripheral surface of the cylindrical block portion and the lower surface of the outer annular flange.
And an engaging hook portion 36 formed on the inner peripheral surface of the annular hanging portion 35. The inner surface of the inner annular flange 32 is the cylindrical portion 2 of the lower bearing case 2.
The second insertion hole 21 has the same diameter as the diameter of the insertion hole 21. An engagement hook portion 36 formed on the inner peripheral surface of the annular hanging portion 35 has a tapered surface portion 36a that extends outward from the outer peripheral end of the annular groove 34 and converges inward with the tapered surface portion 36a. The tapered surface portion 36b and a cylindrical surface portion 36c continuous with the tapered surface portion 36b.

[0011] synthetic resin bearing member 4 is made of the upper, circular plate having a circular hole 41 in a central portion formed by synthetic resin having low rigidity than synthetic resin for forming the lower bearing case 3,2,
On one end surface, a plurality of grooves 42 penetrating from the peripheral edge of the circular hole 41 to the outer peripheral surface are formed at equal intervals in the circumferential direction. The groove 42 serves as a reservoir for a lubricant such as grease. The bearing body 4 is buried in an annular groove 28 formed in the annular recess 24 of the lower bearing case 2, and the end face on which the groove 42 is formed is disposed so as to protrude from the opening of the groove 28. Have been.

The upper bearing case 3 made of synthetic resin having the above-mentioned structure is used to cover the lower surface of the cylindrical block portion 31 with the lower bearing case 2.
One end face is inserted into an annular groove 28 formed in the annular recess 24 of FIG.
The bearing body protruded from the opening of the annular groove 28 and embedded therein.
4 , and the engaging hook portion 36 of the annular hanging portion 35 is elastically attached to the engaging portion 26 of the annular projecting portion 25 of the lower bearing case 2, and the elastic attaching portion is sealed by a labyrinth action. Forming part and combined with synthetic resin thrust bearing
1 is configured.

FIG. 3 shows a state in which the synthetic resin thrust bearing 1 having the above-described structure is incorporated in a strut assembly A. Cylindrical part 22 of lower bearing case 2
And the inner surface of the inner annular flange portion 32 of the upper bearing case 3 by the flat portion 7 of the upper spring seat 7 of the strut 5.
1 Insert the projection 29 formed in the outer peripheral surface of the piston rod 6 disposed through the insertion hole 72 formed in the center and facing the lower surface of the annular flange portion 23 of the lower bearing case 2. Hole 73 formed in flat portion 71 of upper spring seat 7
The upper surface of the upper bearing case 3 is brought into contact with the vehicle body-side mounting member 8 so that the synthetic resin thrust bearing 1 is brought into contact with the upper spring seat. 7 and the vehicle-body-side mounting member 8. In the strut assembly A incorporating the synthetic resin thrust bearing 1 as described above, when relative rotation occurs between the vehicle body-side mounting member 8 and the upper spring seat 7 by the steering operation, the lower bearing of the synthetic resin thrust bearing 1 is used. The rotation is allowed by sliding contact between the bearing body 4 fixed to the case 2 and the lower surface of the cylindrical block portion 31 of the upper bearing case 3.

The synthetic resin bearing body 4 is formed of a synthetic resin having a lower rigidity than the synthetic resin forming the upper and lower bearing cases, and has an annular groove 28 formed in the annular recess 24 of the lower bearing case 2. The other end face to the opening of the annular groove.
Since the bearing body 4 is buried so as to protrude, the creep resistance of the bearing body 4 is enhanced. Therefore, the relative rotation between the upper bearing case 3 and the lower bearing case 2 can be reduced with a small frictional resistance (low friction coefficient) without causing frictional fluctuation between the bearing body 4 and the lower surface of the cylindrical block portion 31 of the upper bearing case 3. An acceptable and smooth steering feeling is maintained for a long time.

FIG. 4 shows another embodiment of the synthetic resin thrust bearing 1 having the above-described configuration. This embodiment is a mating member formed on the lower surface of the annular flange portion 23 of the lower bearing case 2 of the thrust bearing 1. Instead of the projection 29 for positioning on the mounting portion, a cylindrical protruding portion 29a is formed on the lower surface of the annular flange portion 23 of the lower bearing case 2 so as to communicate with the insertion hole 21 of the cylindrical portion 22. In the synthetic resin thrust bearing 1 according to this embodiment, the cylindrical projecting portion 37 is press-fitted and fixed to a hole 72 formed in the center of the flat portion 71 of the upper spring seat 7.

FIG. 5 shows still another embodiment. In this embodiment , one end face is formed in an annular groove 28 formed in an annular recess 24 of the lower bearing case 2 and an opening of the annular groove 28 is formed. This shows another embodiment of the synthetic resin bearing body 4 which is more protruded and embedded. That is, the bearing body 4 includes a disk-shaped portion 43 having a circular hole 41 in the center, and annular flanges 44 and 45 extending from the one end of the disk-shaped portion 43 to the outer peripheral surface. multiple formed at equal intervals in the circumferential direction on the upper surface of the disc-shaped portion 43 including the upper surface of the annular flange portion 44, 45 from the periphery of the inner annular flange portion 44 through the peripheral edge of the outer annular flange portion 45 The bearing body 4 has the annular flanges 44 and 45 protruding from the annular groove 28 formed in the annular recess 24 of the lower bearing case 2, and the plate-like portion 43 are arranged so embedded in the annular groove 28. Also in the embodiment shown in FIG. 5, in place of the projection 29 for positioning to the mating attachment portion formed on the lower surface of the annular flange portion 23 of the lower bearing case, as shown in FIG. A cylindrical projection communicating with the insertion hole 21 of the cylindrical portion 22 may be formed on the lower surface of the cylindrical portion 22.

FIG. 6 shows still another embodiment. In this embodiment, a synthetic resin bearing body 4 in a synthetic resin thrust bearing 1 having the above-described configuration is embedded and fixed to the lower surface of a cylindrical block portion of an upper bearing case 3. It was done. That is, the lower bearing case 2 made of synthetic resin has the insertion hole 21
, A wide annular flange portion 23 extending radially outward on the outer peripheral surface at the lower end of the cylindrical portion 22, and the annular flange portion 2
An annular projection 25 extending upwardly on the outer peripheral edge of the annular projection 3 and defining an annular recess 24 with the cylindrical portion 22 and the upper surface of the annular flange; an engaging portion 26 formed on the outer peripheral surface of the annular projection 25; It has. Protrusions 29 are formed on the lower surface of the annular flange 23 so as to face each other in the radial direction, and the protrusions 29 are used for positioning when the synthetic resin thrust bearing 1 is assembled and fixed to the strut assembly as in the above-described embodiment. Play a role. An engagement portion 26 formed on the outer peripheral surface of the annular projection 25
The tapered surface portion 26a extending outward from the outer peripheral end of the annular projecting portion 25 and the tapered surface portion 26a are continuous, converged inward, and connected to the outer peripheral cylindrical surface of the annular flange portion 23. And a surface portion 26b.

The upper bearing case 3 made of synthetic resin includes a cylindrical block portion 31, an inner annular flange portion 32 extending radially inward on the inner peripheral surface of the upper end of the cylindrical block portion 31, and an upper end of the cylindrical block portion 31. An outer annular flange 33 extending radially outward on the outer peripheral surface, and an annular groove 34 extending downwardly on the outer peripheral edge of the outer annular flange 33 and including the cylindrical block outer peripheral surface and the outer annular flange lower surface. An annular hanging part 35 defining the annular hanging part 35
An engagement hook portion 36 formed on the inner peripheral surface of the cylindrical block portion 31 and an annular concave groove 38 formed on the lower surface of the cylindrical block portion 31 are provided. The inner surface of the inner annular flange 32 is the lower bearing case 2
Is formed to have the same diameter as the diameter of the insertion hole 21 of the cylindrical portion 22. An engagement hook portion 36 formed on the inner peripheral surface of the annular hanging portion 35 has a tapered surface portion 36a that extends outward from the outer peripheral end of the annular groove 34 and converges inward with the tapered surface portion 36a. The tapered surface portion 36b and a cylindrical surface portion 36c continuous with the tapered surface portion 36b.

The synthetic resin bearing body 4 is made of a disc having a circular hole 41 at the center formed of a synthetic resin having lower rigidity than the synthetic resin forming the upper and lower bearing cases, and one end face thereof. A plurality of grooves (not shown) penetrating from the peripheral edge of the circular hole 41 to the outer peripheral surface are formed at equal intervals in the circumferential direction. The groove serves as a reservoir for a lubricant such as grease.
The bearing body 4 is buried in an annular groove 38 formed on the lower surface of the cylindrical block portion 31 of the upper bearing case 3, and the end face on which the groove is formed projects from the opening of the annular groove 38. It is arranged. The bearing synthetic resin upper bearing case 3 that is embedded in one of its end faces in an annular groove 38 formed on the lower surface of the cylindrical block portion 31 protrudes through the opening of the annular groove 38 configured as described above The projecting end surface of the body 4 is slidably contacted with the bottom surface 27 of the annular concave portion 24 of the synthetic resin lower case 2 and the engaging hook portion 36 of the annular hanging portion 35 is attached to the lower bearing case.
The synthetic resin thrust bearing 1 is formed by elastically mounting the engaging portion 26 of the second annular projecting portion 25 and forming a sealing portion by a labyrinth action on the elastic mounting portion. In the embodiment shown in FIG. 6 as well, as shown in FIG. 4 described above, instead of the projection 29 for positioning on the mating attachment portion formed on the lower surface of the annular flange portion 23 of the lower bearing case. In addition, a cylindrical protrusion communicating with the insertion hole 21 of the cylindrical portion 22 may be formed on the lower surface of the annular flange portion 23.

[0020] Figure 7 is in the synthetic resin thrust bearing 1 having the structure shown in FIG. 6, one end surface of the annular concave annular groove 38 formed on the lower surface of the cylindrical block portion 31 of the upper bearing case 3 This shows another embodiment of the synthetic resin bearing body 4 buried so as to protrude from the opening of the groove 38 . That is, the bearing body 4 includes a disk-shaped portion 43 having a circular hole 41 in the center, and annular flanges 44 and 45 extending from the one end of the disk-shaped portion 43 to the outer peripheral surface. Including the upper surfaces of the annular flanges 44 and 45
Outer ring from the periphery of the inner annular flange portion 44 on the upper surface of the disc-shaped portion 43
They are formed at equal intervals in the circumferential direction through the periphery of the Jo flange portion 45
The bearing body 4 has the annular flanges 44 and 45 protruding from annular concave grooves 38 formed on the lower surface of the cylindrical block 31 of the upper bearing case 3. , and a circular plate-shaped portion 43 is disposed so embedded in the annular groove 38.

[0021] Also in the embodiment shown in FIG. 7, FIG. 4
Instead of the protrusion 29 for positioning the mating mounting portion formed on a lower surface annular flange portion 23 of the lower bearing case 2 as shown in,
The cylindrical portion 22 is provided on the lower surface of the annular flange portion 23 of the lower bearing case 2.
It is also possible to form a cylindrical projection communicating with the insertion hole 21 of the first embodiment.

[0022]

[Effect of the invention] above in accordance with the synthetic resin thrust bearing of the present invention, the synthetic resin, the synthetic resin bearing member which is disposed between the lower bearing case, formed in the annular recess of the synthetic resin lower case The annular concave groove or the annular groove formed on the lower surface of the cylindrical block portion of the synthetic resin upper bearing case is buried in the annular concave groove, and one end face thereof is disposed so as to protrude from the opening of the annular groove. The open surface of the bearing body, in other words
The outer peripheral surface of the protruding portion protruding from the opening of the annular groove can be made as small as possible, and as a result, the creep resistance of the bearing body is enhanced. Therefore, the upper and lower bearing cases are used as a synthetic resin forming the bearing body. It is possible to use a synthetic resin having a lower rigidity than the synthetic resin forming the resin. As a result, relative rotation of the upper and lower bearing cases via the bearing body is smoothly allowed without causing frictional fluctuation, and a smooth steering feeling is maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a preferred embodiment of a synthetic resin thrust bearing according to the present invention.

FIG. 2 is a plan view showing a synthetic resin lower bearing case and a synthetic resin bearing body in FIG. 1;

FIG. 3 is a longitudinal sectional view showing a state where the synthetic resin thrust bearing shown in FIG. 1 is incorporated in a strut assembly.

FIG. 4 is a longitudinal sectional view showing another embodiment of the synthetic resin thrust bearing shown in FIG.

5 is a longitudinal sectional view showing another embodiment of the synthetic resin thrust bearing shown in FIG.

FIG. 6 is a longitudinal sectional view showing another embodiment of the synthetic resin thrust bearing according to the present invention.

7 is a longitudinal sectional view showing another embodiment of the synthetic resin thrust bearing shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin thrust bearing 2 Synthetic resin lower bearing case 22 Cylindrical part 23 Annular flange 24 Annular recess 25 Annular protrusion 26 Engagement part 28 Annular concave groove 3 Synthetic resin upper bearing case 31 Cylindrical block part 35 Annular hanging part 36 Engagement hook part 38 Annular concave groove 4 Bearing body made of synthetic resin

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16C 17/04 F16C 33/20 B60G 15/06

Claims (6)

(57) [Scope of request for utility model registration] A cylindrical portion (2) having an insertion hole (21) on the inner surface.
2) a wide annular flange portion extending radially outward on the lower end outer peripheral surface of the cylindrical portion (23) extending upwardly to the outer peripheral edge of the annular flange portion, said cylindrical portion and the annular flange portion Annular recess with top surface (24)
An annular projection (25) defining an annular projection, an engagement portion (26) formed on the outer peripheral surface of the annular projection, and an annular groove (28) formed on the bottom surface (27) of the annular recess. One end face of the lower bearing case (2) made of synthetic resin and the annular groove (28) is inserted into the annular groove (28).
A synthetic resin bearing body (4) buried so as to protrude from the opening , a cylindrical block (31), and an inner annular flange (radially inwardly extending on an inner peripheral surface at an upper end of the cylindrical block); 32) and extends downwardly on the outer peripheral edge of the outer annular flange portion outer annular flange portion extending radially outward on the upper end outer peripheral surface of the cylindrical block portion (33), the outer periphery of the cylindrical block portion An annular hanging portion (35) defining an annular groove (34) by the surface and a lower surface of the outer annular flange, and an engaging hook portion (36) formed on an inner peripheral surface of the annular hanging portion. And an upper bearing case (3) made of a synthetic resin provided with a cylindrical groove (2) of the lower bearing case (2).
8) Sliding contact with the protruding end surface of the bearing body (4) embedded in the bearing body (4) , and the engagement hook portion (36) of the annular hanging portion (35) with the annular projecting portion (25) of the lower bearing case (2). The engaging part (26) is elastically mounted, and the elastic mounting part is combined by forming a sealing part by a labyrinth action. The bearing body (4) is composed of the upper and lower bearing cases (3) and (2). A synthetic resin thrust bearing characterized by being formed of a synthetic resin having a lower rigidity than the synthetic resin forming the thrust bearing. 2. The synthetic resin bearing body (4) comprises a disk having a circular hole (41) at the center, and one end face of the disk protrudes from the opening of the annular groove (28). 2. The synthetic resin thrust bearing according to claim 1, wherein said synthetic resin thrust bearing is embedded in said annular groove. 3. A synthetic resin bearing body (4) includes a disc-shaped part (43) having a circular hole (41) in the center and one end of the disc-shaped part on the outer peripheral surface. Extended annular collar (4
4) and (45), wherein the annular flange is projected from the annular groove (28), and the disc-shaped portion (43) is buried in the annular groove. The synthetic resin thrust bearing described. 4. A cylindrical portion (2) having an insertion hole (21) on the inner surface.
2) a wide annular flange portion extending radially outward on the lower end outer peripheral surface of the cylindrical portion (23) extending upwardly to the outer peripheral edge of the annular flange portion, said cylindrical portion and the annular flange portion Annular recess with top surface (24)
A lower bearing case (2) made of a synthetic resin having an annular projection (25) defining an annular projection and an engagement section (26) formed on the outer peripheral surface of the annular projection; An inner annular flange portion (32) extending radially inward on the inner peripheral surface at the upper end of the cylindrical block portion, and an outer annular flange portion (33) extending radially outward on the outer peripheral surface at the upper end of the cylindrical block portion. ) and extended downward to the outer peripheral edge of the annular flange portion, the outer peripheral surface and the annular suspended portion in the lower surface of the outer annular flange portion defining an annular groove (34) of the cylindrical block portion (35) and the annular An engaging hook portion (36) formed on the inner peripheral surface of the hanging portion and an annular concave groove (3) formed on the lower surface of the cylindrical block portion (31).
8) a synthetic resin upper bearing case (3) provided with the annular groove (38) ;
Embedded is protruded from the opening portion, the upper, lower bearing case (3), and lower in the synthetic resin formed synthetic resin bearing member rigid than the synthetic resin forming the (2) (4), consists , upper bearing case (3) is a bottom of the annular recess of the cylinder block portion (31) a lower surface of the lower bearing case the protruding end surface of the buried said bearing body to an annular groove (38) (4) (2) (27) and the engaging hook (36) of the annular hanging part (35) is elastically attached to the engaging part (26) of the annular protrusion (25) of the lower bearing case (2). A synthetic resin thrust bearing, wherein the elastic mounting portion is combined with a sealing portion formed by a labyrinth action. 5. A synthetic resin bearing body (4) comprises a disk having a circular hole (41) in the center, and one end face of the disk protrudes from the opening of the annular groove (38). The synthetic resin thrust bearing according to claim 4, wherein the thrust bearing is embedded in the annular groove. 6. A synthetic resin bearing body (4) includes a disc-shaped portion (43) having a circular hole (41) at a center portion and one end portion of the disc-shaped portion on an outer peripheral surface. Extended annular collar (4
4) and (45), wherein the annular flange is projected from the annular groove (38), and the disc-shaped portion (43) is buried in the annular groove. The synthetic resin thrust bearing described.