JP2001027228A - Sliding bearing made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding bearing made of synthetic resin, capable of maintaining smooth steering during steering operation over a long period of time without lowering a sliding characteristic and eliminating the generation of noise caused by the infiltration of dust, muddy water, and the like by preventing the infiltration of muddy water and the like. SOLUTION: This sliding bearing 1 made of synthetic resin is provided with a lower case 2 made of synthetic resin, an upper case 3 made of synthetic resin and placed over the lower case 2, an outer sealing means 5 disposed on the outer peripheral side in a space 4 between the upper and lower cases 3, 2, an inner labyrinth sealing means 6 disposed on the inner peripheral side in the space 4 between the upper and lower cases 3, 2, an inner elastic sealing means 7 disposed on the inner peripheral side of the lower case 2, and a thrust sliding bearing means 8 made of synthetic resin and disposed in the space 4 between the upper and lower cases 3, 2 and between the outer sealing means 5 and the inner labyrinth sealing means 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

A strut type suspension used for a front wheel of a four-wheeled vehicle generally has a coil spring combined with a strut assembly having a hydraulic shock absorber incorporated in an outer cylinder integrated with a main shaft. Has a structure. In such a suspension, when the strut assembly rotates together with the coil spring in the steering operation, there are a type in which the piston rod of the strut assembly rotates and a type in which the piston rod does not rotate. In order to allow the rotation smoothly, between the mounting member of the vehicle body and the upper spring seat of the coil spring,
In some cases, a sliding bearing made of a synthetic resin is used in place of the rolling ball bearing.

A plain bearing made of a synthetic resin usually has a lower case made of a synthetic resin and an upper case made of a synthetic resin superposed on the lower case, and a space between the lower case and the upper case. A thrust slide bearing member or a slide bearing protrusion is disposed in the space, but if dust, muddy water, or the like enters this space, a desired bearing function may not be obtained. On the other hand, since the strut type suspension is mounted on the part where dust, muddy water, etc. act directly while the vehicle is running, the usage environment of the sliding bearing mounted between the mounting member of the vehicle body and the upper spring seat of the coil spring is also limited. It will be extremely harsh. Therefore, when the outer peripheral side and the inner peripheral side of the space in which the thrust slide bearing member or the slide bearing protrusion is disposed are directly opened to the outside, the danger of dust, muddy water and the like from entering the space becomes extremely high. Here, the sealing property becomes extremely important.

Further, in a sliding bearing made of synthetic resin of a type in which an inner peripheral surface of a lower case is brought into contact with a surface of a piston rod of a strut assembly to be mounted between a mounting member of a vehicle body and an upper spring seat of a coil spring. Danger of muddy water entering the gap between the inner peripheral surface of the lower case and the surface of the piston rod, and further into the space in which the thrust slide bearing member or the slide bearing projection is disposed through this gap. There is.
In particular, in a strut assembly in which the piston rod rotates, if muddy water is present in the gap between the inner peripheral surface of the lower case and the surface of the piston rod, abnormal noise may occur due to the rotation of the piston rod, resulting in smooth steering. Operation may be difficult to secure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and has been made in consideration of the above-mentioned problems, and provides a sliding surface in a space in which a thrust sliding bearing member or a thrust sliding bearing projection is disposed, an inner peripheral surface of a lower case, and a piston rod. Prevents dust, muddy water, etc. from entering the gap between the front and the surface, eliminates the generation of abnormal noise caused by dust, muddy water, etc., and further reduces the sliding characteristics during steering operation. An object of the present invention is to provide a synthetic resin sliding bearing that can maintain smooth steering for a long period of time.

[0006]

According to a first aspect of the present invention, there is provided a sliding bearing made of synthetic resin, comprising: a lower case made of synthetic resin; an upper case made of synthetic resin stacked on the lower case;
Outer seal means arranged on the outer peripheral side in the space between the upper and lower cases, inner labyrinth seal means arranged on the inner peripheral side in the space between the upper and lower cases, and arranged on the inner peripheral side of the lower case An inner elastic seal means, and a synthetic resin thrust sliding bearing means disposed between the outer seal means and the inner labyrinth seal means and in a space between the upper and lower cases, wherein the lower case Has an inner cylindrical portion having a cylindrical inner peripheral surface, and a first annular plate portion integrally formed at one end of the inner cylindrical portion, and the upper case has a first annular shape. A second annular plate portion facing the plate portion, and an outer tubular portion formed integrally with the outer peripheral end of the second annular plate portion and having a cylindrical inner peripheral surface, The thrust slide bearing means is provided between the first and second annular plates. The inner labyrinth sealing means includes at least one first annular projection integrally formed on the first annular plate portion so as to protrude toward the second annular plate portion, and the second annular plate portion. The plate portion includes at least one second annular protrusion that is integrally formed so as to protrude toward the first annular plate portion and cooperates with the first protrusion to form a labyrinth. The inner elastic sealing means includes an annular main body mounted on the inner peripheral surface of the inner cylindrical portion, and at least one annular elastic lip provided on the main body.

According to the sliding bearing made of synthetic resin of the first aspect, since the inner labyrinth sealing means disposed on the inner peripheral side in the space between the upper and lower cases is provided,
Muddy water can be prevented from entering the sliding surface of the thrust sliding bearing means from the inner peripheral side, and smooth steering during steering operation can be maintained for a long period of time without degrading the sliding characteristics caused by the penetration of muddy water etc. In addition, since the inner elastic sealing means arranged on the inner peripheral side of the lower case has an annular elastic lip portion, the inner elastic surface of the lower case and the surface of the piston rod of the strut assembly, for example, To prevent the intrusion of muddy water and the like into the gap, and to eliminate the generation of abnormal noise due to the intrusion of muddy water and the like. And the danger of intrusion of muddy water into the space between the lower cases can be more reliably eliminated.

In the synthetic resin sliding bearing according to the second aspect of the present invention, in the elastic sealing means inside the synthetic resin sliding bearing according to the first aspect, the main body is provided with a cored member. The lip is made of an elastic material.

According to the sliding bearing made of synthetic resin of the second aspect, since the inner elastic sealing means is mounted on the inner peripheral surface of the inner cylindrical portion via the core member, the sliding bearing is firmly mounted. As a result, the inner elastic sealing means can be effectively prevented from falling off, and the elastic lip portion made of elastic material can make close contact with, for example, the piston rod. Sealing of the gap with the surface of the rod can be achieved almost completely.

According to a third aspect of the present invention, there is provided a synthetic resin plain bearing according to the first aspect.
The inner elastic sealing means includes an elastic sealing member having two elastic lip portions, and the main body portion and the two elastic lip portions are integrally formed from an elastic material so as to have a U-shaped cross section.

According to the sliding bearing of the third aspect, since the inner elastic sealing means comprises an elastic sealing member having two elastic lips, for example, it can be in close contact with the piston rod at two places. Thus, the gap between the inner peripheral surface of the lower case and the surface of the piston rod can be more completely sealed. As the elastic material constituting the inner elastic sealing means, a rubber elastic body such as natural rubber or synthetic rubber or a plastic elastomer such as polyester or polyurethane is used.

According to a fourth aspect of the present invention, in the synthetic resin sliding bearing according to any one of the first to third aspects, the outer sealing means includes an outer labyrinth sealing means. The outer labyrinth seal means includes at least one third annular projection integrally formed on the first annular plate portion so as to protrude toward the second annular plate portion; The plate portion includes at least one fourth annular protrusion that is integrally formed so as to project toward the first annular plate portion and that forms a labyrinth in cooperation with the third protrusion. .

According to a fifth aspect of the present invention, there is provided a sliding bearing made of a synthetic resin according to the fourth aspect.
An annular fifth protrusion protruding radially inward is integrally formed on the inner peripheral surface of the outer cylindrical portion, and the outer labyrinth seal means is brought into meshing contact with the fifth protrusion. And a projection integrally formed on the outer peripheral end of the first annular plate portion as a fourth projection.

According to a sixth aspect of the present invention, there is provided a synthetic resin sliding bearing according to any one of the first to fifth aspects, wherein the outer sealing means comprises an outer elastic sealing means. The outer elastic sealing means is provided on the annular main body attached to the outer peripheral end of the first annular plate, and is provided on the main body to contact the inner peripheral surface of the outer cylindrical portion of the upper case. And at least one annular elastic lip.

According to the present invention, the outer sealing means may be provided with an outer labyrinth sealing means as in the slide bearing of the fourth embodiment, and may be used instead of or together with the sixth embodiment. As in the case of the plain bearing described above, the outer bearing may be provided with an outer elastic sealing means. When the outer labyrinth sealing means is provided to constitute the outer sealing means, as in the sliding bearing of the fifth aspect, the outer labyrinth sealing means is formed on the inner peripheral surface of the outer cylindrical portion as a projection of the outer labyrinth sealing means. Outer labyrinth sealing means, comprising a projection integrally formed on the outer peripheral end of the first annular plate portion so as to engage with the fifth projection, preferably in a snap-fit manner. It is preferable because the intrusion of muddy water and the like into the labyrinth formed can be more reliably prevented.

According to a seventh aspect of the present invention, in the synthetic resin sliding bearing according to the sixth aspect, in the outer elastic sealing means of the synthetic resin sliding bearing, the main body has a cored member. The lip is made of an elastic material.

[0017] In the synthetic resin sliding bearing of the seventh aspect,
Since the outer elastic sealing means is attached to the outer peripheral end of the first annular plate portion via the core member, the outer elastic sealing means can be firmly attached, and the outer elastic sealing means can be effectively prevented from falling off,
In addition, the elastic lip portion made of an elastic material can make close contact with the inner peripheral surface of the outer cylindrical portion of the upper case, so that the outer peripheral side sealing in the space between the upper and lower cases is almost completely completed. Can be achieved. As the elastic body constituting the outer elastic sealing means, a rubber elastic body such as natural rubber or synthetic rubber or a plastic elastomer such as polyester or polyurethane is used.

In the synthetic resin sliding bearing according to the eighth aspect of the present invention, in the synthetic resin sliding bearing according to any of the first to seventh aspects, the thrust sliding bearing means is separate from the upper and lower cases. The body consists of a thrust sliding bearing member made of synthetic resin.

In the sliding bearing according to the present invention, the thrust sliding bearing means is preferably formed of a synthetic resin thrust sliding bearing member separate from the upper and lower cases as in the eighth aspect. Alternatively, the upper or lower case may be constituted by a thrust slide bearing unit integrally formed.

According to a ninth aspect of the present invention, there is provided the sliding bearing made of synthetic resin according to any one of the first to eighth aspects, wherein the elastic lip portion of the inner elastic sealing means has an annular shape. Is formed so that one end side thereof elastically contacts the piston rod of the strut assembly.

The sliding bearing of the present invention is preferably incorporated in a strut type suspension (MacPherso type) in a four-wheeled vehicle. In this case, the elastic lip portion of the inner elastic sealing means has a ninth aspect. It may be configured like a plain bearing.

The synthetic resin constituting the upper and lower cases according to the present invention preferably has excellent sliding and mechanical properties such as wear resistance, impact resistance and creep resistance. The synthetic resin constituting the thrust slide bearing means housed between the two is preferably particularly self-lubricating. For example, polyacetal resin, polyamide resin, polyester resin such as polybutylene terephthalate (PBT), and polyolefin resin such as polyethylene and polypropylene. And the like are preferably used. In addition, polycarbonate resins and the like can also be used.

For the upper and lower cases, a synthetic resin similar to the synthetic resin constituting the thrust slide bearing means can be used. In particular, a combination of the synthetic resin used for the thrust slide bearing means and a good combination of friction characteristics is provided. It is desirable that the synthetic resin be relatively rigid. To illustrate the preferred combination, for the thrust sliding bearing means and the upper and lower cases, a combination of polyacetal and polyamide, a combination of polyethylene and polyacetal, a combination of polyacetal and PBT, and a combination of polyacetal and polyacetal are given. is there.

Next, the present invention will be described in more detail based on an example of a preferred embodiment shown in the drawings. The present invention is not limited to these examples.

[0025]

1 to 3, a synthetic resin sliding bearing 1 of the present embodiment comprises a lower case 2 made of synthetic resin, an upper case 3 made of synthetic resin superimposed on the lower case 2, and an upper case 3 made of synthetic resin. Outer sealing means 5 disposed on the outer peripheral side in the space 4 between the lower cases 2 and 3; inner labyrinth sealing means 6 disposed on the inner peripheral side in the space 4 between the upper and lower cases 2 and 3; A synthetic resin disposed in the space 4 between the outer sealing means 5 and the inner labyrinth seal sealing means 6 and between the upper and lower cases 2 and 3; Thrust bearing means 8 made of stainless steel.

The lower case 2 includes an inner cylindrical portion 12 having a cylindrical inner peripheral surface 11, an annular plate portion 13 integrally formed at one end of the inner cylindrical portion 12, and an upper surface of the annular plate portion 13. 14
Inner and outer annular projections 16 and 17 integrally formed so as to project toward the annular plate portion 15 of the upper case 3.
And The inner cylinder portion 12 integrally includes a pressure cylinder portion 19 having a small-diameter inner peripheral surface 18 and a thin cylinder portion 21 having a large-diameter inner peripheral surface 20. Is defined by an inner peripheral surface 18 and an inner peripheral surface 20, and defines an insertion hole 23 through which the piston rod 22 of the shock absorber in the strut assembly shown in FIG. 4 is inserted.
The inner peripheral surface 18 comes into contact with the surface 24 of the piston rod 22.

The upper case 3 is formed integrally with the annular plate 15 formed so as to face the annular plate 13 so as to face the annular plate 13 and at the outer peripheral end of the annular plate 15. An outer cylindrical portion 32 having an inner peripheral surface 31 concentric with the inner peripheral surface 11 of the case 2, and an annular member integrally formed on the inner peripheral surface 31 of the outer cylindrical portion 32 so as to protrude radially inward. Protrusion 33
And The inner peripheral surface 34 of the annular plate portion 15 is flush with the inner peripheral surface 18 and defines the insertion hole 23 through which the piston rod 22 is inserted in cooperation with the inner peripheral surface 11.

The outer sealing means 5 is provided with an outer elastic sealing means 41. The outer elastic sealing means 41 includes an annular main body 42 mounted on the outer peripheral end of the annular plate portion 13, and
From the annular one end of the main body part 42, it is integrally folded, gradually expanded in diameter, and extends toward the other end side of the main body part 42.
An annular elastic lip 43 provided coaxially with the main body 42 and provided at one end of the main body 42; and a flange 45 integrally extending from the other end of the main body 42 and having an annular lip 44 at the inner peripheral end. The flange portion 45 having the annular lip portion 44, the main body portion 42, and the elastic lip portion 43 are integrally formed from an elastic material made of rubber or a plastic elastomer. , A mandrel 46 is attached. The annular tip of the elastic lip 43, which is made thicker toward the free end, is in elastic contact with the inner peripheral surface 31 of the outer tubular portion 32 of the upper case 3, and the main body 42 is The collar 45 is attached to the outer peripheral end of the annular plate 13 via a metal 46.
7 is arranged in an annular step portion 48 formed on the outer peripheral side.
The annular lip 44 of the flange 45 is in elastic contact with the annular plate 13 at the annular step 48. The outer sealing portion 5 forms a sealing portion on the outer peripheral side of the sliding bearing 1.

The inner labyrinth sealing means 6 is formed on the upper surface 14 of the annular plate portion 13 to project toward the annular plate portion 15 and is integrally formed with one annular projection 51 in this embodiment. At least one protrusion 5 is formed on the lower surface 74 so as to protrude toward the annular plate portion 13 and form a labyrinth 52 in cooperation with the protrusion 51.
Two outer and inner annular projections 53 and 5
The inner labyrinth sealing means 6 forms a sealing portion on the inner peripheral side of the sliding bearing 1.

The inner elastic sealing means 7 is mounted on the inner peripheral surface 20 of the thin-walled cylindrical portion 21 of the inner cylindrical portion 12 and has annular flange portions 61 and 62 extending radially inward at both ends. And a ring-shaped main body 63 and a flange 6 of the main body 63.
2 is fixed to the piston rod 22 of the strut assembly.
And an annular elastic lip portion 64 formed so as to elastically contact the surface 24 of the main body portion 63 in this example.
Is made of a metal member serving as a core metal for an elastic lip portion 64 formed of an elastic material made of rubber or plastic elastomer.
And the elastic lip portion 64 is made thinner toward the inner peripheral side which is the free end side. The sliding bearing 1 is cooperated with the inner labyrinth sealing means 6 by the inner elastic sealing means 7.
At the inner peripheral side is formed.

The thrust sliding bearing means 8 disposed between the annular plate portions 13 and 15 comprises an annular thrust sliding bearing member 71 made of a synthetic resin and separate from the upper and lower cases 2 and 3. Between the plate portion 13 and the annular plate portion 15, and in the annular space between the annular protrusion 16 and the annular protrusion 17, the lower surface 72 and the upper surface 73 respectively have the upper surface 14 of the annular plate portion 13 and the upper surface The lower surfaces 74 are slidably disposed in contact with each other. The thrust slide bearing member 71 is
It is positioned in the radial direction by the annular projections 16 and 17, and a linear groove 75 and an annular groove 76 as a grease reservoir are formed on the lower surface 72 and the upper surface 73 thereof. Each of the plurality of linear grooves 75 extends in the radial direction and is arranged at equal angular intervals, and the annular groove 76 communicates with each of the linear grooves 75.

As shown in FIG.
The mounting member 8 on the vehicle body side to which the piston rod 22 is inserted through the insertion hole 23 and one end of the piston rod 22 is mounted.
1 and the upper surface 82 of the annular plate portion 15 of the upper case 3 is brought into close contact with the lower surface 47 of the annular plate portion 13 of the lower case 2.
To the upper spring seat 84 of the coil spring 83 in the strut assembly via an annular washer 85 so that the upper spring seat 84 and the mounting member 81
Used between At this time, the inner peripheral surfaces 18 and 34 come into close contact with the surface 24 of the piston rod 22.

When the strut assembly is rotated by the steering operation, the lower case 2 is rotated with respect to the upper case 3, and the rotation of the lower case 2 is caused by a thrust slide disposed between the upper and lower cases 3 and 2. Smoothness is achieved by the bearing member 71, and therefore, steering operation is also performed without resistance. Intrusion of dust and the like from the outer peripheral side into the space 4 between the upper and lower cases 3 and 2 is prevented by the outer elastic sealing means 41, and the inner peripheral surfaces 18 and 34 and the piston rod 22 on the inner peripheral side are prevented from entering. Surface 2
Muddy water or the like enters the gap between the inner peripheral surface 18 and 34 and the surface 24 of the piston rod 22 from the inner peripheral side through the inner elastic sealing means 7. Muddy water or the like is prevented from entering the inner labyrinth seal means 6, and thus the lower surface 72 or the sliding surface of the thrust slide bearing member 71 disposed between the outer elastic seal means 5 and the labyrinth seal means 6. Intrusion of dust, muddy water and the like into the upper surface 73 is reliably prevented.

That is, according to the sliding bearing 1, since the space 4 between the upper and lower cases 2 and 3 is provided with the inner labyrinth sealing means 6 arranged on the inner peripheral side,
Muddy water and the like can be prevented from entering the lower surface 72 and upper surface 73 of the thrust sliding bearing member 71 from the inner peripheral side, and a smooth steering force at the time of steering operation can be reduced without deteriorating the sliding characteristics caused by the penetration of the muddy water and the like. Since the inner elastic sealing means 7 disposed on the inner peripheral side of the lower case 2 has an annular elastic lip portion 64 that elastically contacts the surface 24 of the piston rod 22, Inner peripheral surface 18 of lower case 2 and surface 24 of piston rod 22
Of the muddy water and the like into the gap between the lower case 2 and the inner labyrinth sealing means 6 in combination with The danger of intrusion of muddy water or the like into the space 4 between the upper and lower cases 2 and 3 from the peripheral side can be more reliably eliminated.

According to the sliding bearing 1, the inner elastic sealing means 7 is mounted on the inner peripheral surface 20 of the inner cylindrical portion 12 via the mandrel. The means 7 can be effectively prevented from falling off, and the piston rod 22 is formed by an elastic lip 64 made of an elastic material.
And the gap between the inner peripheral surface 11 of the lower case 2 and the surface 24 of the piston rod 22 can be almost completely sealed, and also through the core member 46. Since the outer elastic seal means 41 is attached to the outer peripheral end of the annular plate portion 13, the outer elastic seal means 41 can be firmly attached and the outer elastic seal means 41 can be effectively prevented from falling off. The elastic lip portion 43 makes it possible to make close contact with the inner peripheral surface 31 of the outer tubular portion 32 of the upper case 3, thereby sealing the outer peripheral side in the space 4 between the upper and lower cases 2 and 3. Almost completely achievable.

In the sliding bearing 1 described above, the outer sealing means 5
Is constituted by the outer elastic sealing means 41. Alternatively, as shown in FIG.
It may be composed of one. The outer labyrinth sealing means 91 shown in FIG.
At least one, in this example, one annular projection 92 protruding toward the annular plate 5 and the lower surface 74 of the annular plate portion 15 are integrally formed so as to project toward the annular plate portion 13. And at least one, in this example, one annular projection 9 which forms a labyrinth 93 in cooperation with the projection 92
4, and the projection 92 is provided on the outer peripheral surface thereof with the projection 33.
Is formed integrally with the outer peripheral end of the annular plate portion 13 so as to mesh with and contact with each other in a snap-fit manner.

In the sliding bearing 1 shown in FIG.
3 are formed, and the protrusion 92 is formed on the outer peripheral surface thereof by the protrusion 3.
3 is formed so as to be engaged with and snap-fitted to the labyrinth 93, so that the intrusion of muddy water or the like into the labyrinth 93 can be more reliably prevented. The danger of intrusion of muddy water or the like into the space 4 can be more reliably eliminated.

The inner elastic sealing means 7 in the sliding bearing 1 shown in FIGS. 1 to 3 and 5 may be replaced with an inner elastic sealing means 101 as shown in FIG. The inner elastic sealing means 101 shown in FIG.
And two annular elastic lips 103 and 104 disposed at both ends of the main body 102, respectively.
2 and an elastic lip 103 and 104 are provided with an elastic seal member 105 integrally formed from an elastic material so as to have a U-shaped cross section. The elastic seal member 105
Annular recess 106 formed in inner peripheral surface 20 of thin-walled cylindrical portion 21
And a part thereof including the main body 102 is fitted and mounted on the thin-walled cylindrical portion 21, and the elastic lip portions 103 and 10
4 is formed so that the free end side, which is the one end side of the ring, is in elastic contact with the surface 24 of the piston rod 22.

According to the inner elastic sealing means 101 shown in FIG. 6, since the inner elastic sealing means 101 is provided with the two elastic lip portions 103 and 104, the inner elastic sealing means 101 closely contacts the surface 24 of the piston rod 22 at two places. The inner surface 18 and the surface 2 of the piston rod 22.
4 can be more completely sealed.

In addition, in the sliding bearing 1 shown in FIG.
Instead of the outer elastic sealing means 41, as shown in FIG.
The outer labyrinth sealing means 91 shown in FIG. 5 may be used. Also in the sliding bearing 1 shown in FIG. 7, dust on the lower surface 72 and the upper surface 73 of the thrust sliding bearing member 71 from the inner peripheral side,
Intrusion of muddy water and the like can be prevented, smooth steering during steering operation can be maintained for a long period of time without deteriorating sliding characteristics caused by intrusion of dust, muddy water, and the like. Surface 24 of piston rod 22
Of the muddy water and the like into the gap between the lower case 2 and the inner labyrinth sealing means 6 in combination with The risk of intrusion of muddy water or the like into the space 4 between the upper and lower cases 2 and 3 from the peripheral side can be more reliably eliminated, and the outer labyrinth sealing means 91 and the inner elastic sealing means 101
Can be used to obtain the above-described unique effects.

In the above example, the thrust slide bearing means 8 is constituted by a separate thrust slide bearing member 71 for the upper and lower cases 2 and 3. 14 or a lower surface 74 of the annular plate portion 15 is integrally formed with a thrust slide bearing projection, and the upper surface or lower surface of the thrust slide bearing projection is formed on the lower surface 74 of the annular plate portion 15 or the upper surface 14 of the annular plate portion 13. The thrust slide bearing means 8 may be constituted by the thrust slide bearing projection so that the thrust slide bearing protrudes. When the thrust slide bearing projection 8 constitutes the thrust slide bearing means 8, the annular projections 16 and 17 can be omitted, but these may be used as the projections of the inner and outer labyrinth seal means 6 and 91.

[0042]

According to the present invention, the sliding surface in the space where the thrust sliding bearing member or the thrust sliding bearing protrusion is disposed, and the clearance between the inner peripheral surface of the lower case and the surface of the piston rod are formed. Synthetic resin that prevents intrusion of dust, muddy water, etc., eliminates generation of abnormal noise due to intrusion of muddy water, etc., and can maintain smooth steering during steering operation for a long time without degrading sliding characteristics Can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of a preferred embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the example shown in FIG.

FIG. 3 is a plan view of the thrust slide bearing member of the example shown in FIG.

FIG. 4 is a sectional view of an example in which the example shown in FIG. 1 is used for a strut assembly.

FIG. 5 is a partially enlarged cross-sectional view of another example of the preferred embodiment of the present invention.

FIG. 6 is a partially enlarged sectional view of still another example of the preferred embodiment of the present invention.

FIG. 7 is a partially enlarged sectional view of still another example of the preferred embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 sliding bearing made of synthetic resin 2 lower case 3 upper case 4 space 5 outer sealing means 6 inner labyrinth sealing means 7 inner elastic sealing means 8 thrust sliding bearing means

Claims (9)

[Claims] 1. A lower case made of synthetic resin, an upper case made of synthetic resin superposed on the lower case, outer sealing means arranged on an outer peripheral side in a space between the upper case and the lower case, and an upper and lower part. An inner labyrinth seal disposed on the inner peripheral side in the space between the cases, an inner elastic seal disposed on the inner peripheral side of the lower case, and an upper and lower part between the outer seal and the inner labyrinth seal. A thrust sliding bearing made of synthetic resin disposed in a space between the cases; the lower case is integrally formed with an inner cylindrical portion having a cylindrical inner peripheral surface and one end of the inner cylindrical portion. The upper case has a second annular plate facing the first annular plate, and an outer peripheral end of the second annular plate. Integrally formed, cylindrical inner peripheral surface And an outer cylindrical portion having
The thrust slide bearing means is disposed between the first and second annular plate parts, and the inner labyrinth seal means projects integrally with the first annular plate part toward the second annular plate part. The formed at least one first annular projection and the second annular plate portion are integrally formed so as to protrude toward the first annular plate portion and cooperate with the first projection. At least one second annular projection forming a labyrinth, wherein the inner elastic sealing means has an annular main body mounted on the inner peripheral surface of the inner cylindrical portion, and at least the main body provided with at least one second annular projection. A sliding bearing made of synthetic resin, comprising a single annular elastic lip. 2. The synthetic resin sliding bearing according to claim 1, wherein in the inner elastic sealing means, the main body has a cored member, and the elastic lip is made of an elastic material. 3. The inner elastic sealing means has two elastic lip portions, and an elastic seal in which a main body portion and two elastic lip portions are integrally formed from an elastic material so as to have a U-shaped cross section. The sliding bearing made of a synthetic resin according to claim 1, comprising a member. 4. The outer labyrinth sealing means includes an outer labyrinth sealing means, and the outer labyrinth sealing means is formed integrally with the first annular plate portion so as to project toward the second annular plate portion. At least one third annular protrusion and a second annular plate portion, which are integrally formed so as to protrude toward the first annular plate portion and cooperate with the third protrusion. The sliding bearing made of synthetic resin according to any one of claims 1 to 3, further comprising at least one fourth annular projection that forms 5. An annular fifth projection protruding radially inward is integrally formed on an inner peripheral surface of the outer cylindrical portion, and the outer labyrinth sealing means is provided on the fifth projection. The sliding bearing made of synthetic resin according to claim 4, comprising a projection integrally formed on an outer peripheral end of the first annular plate portion as a fourth projection so as to make meshing contact. 6. The outer sealing means includes an outer elastic sealing means, the outer elastic sealing means comprising: an annular main body mounted on an outer peripheral end of the first annular plate; A sliding bearing made of synthetic resin according to any one of claims 1 to 5, further comprising at least one annular elastic lip provided in contact with an inner peripheral surface of the outer cylindrical portion of the upper case. . 7. The synthetic resin sliding bearing according to claim 6, wherein in the outer elastic sealing means, the main body has a mandrel, and the elastic lip is made of an elastic material. 8. The synthetic resin sliding bearing according to claim 1, wherein the thrust sliding bearing means comprises a synthetic resin thrust sliding bearing member separate from the upper and lower cases. 9. The elastic lip of the inner elastic sealing means,
The sliding bearing made of synthetic resin according to any one of claims 1 to 8, wherein the annular one end is formed so as to elastically contact the piston rod of the strut assembly.