JP2023145096A - Slide bearing and suspension - Google Patents

Abstract

To provide a slide bearing capable of reducing vibration transmitted to a support object.SOLUTION: A slide bearing 1 includes an upper case 2, a lower case 3, and a center plate 4 disposed between the upper case 2 and the lower case 3 and achieving relative rotation between the upper case 2 and the lower case 3. The center plate 4 has an annular thick portion 400 and an annular thin portion 401 alternately arranged with respect to a same center O. The annular thick portion 400 has a first annular protrusion 402 which is brought into contact with the upper case 2 side, and a second annular protrusion 403 which is provided on the same circumference as that of the first annular protrusion 402 and is brought into contact with the lower case 3 side. The annular thin portion 401 is not brought into contact with the upper case 2 side and the lower case 3 side. The lower case 3 has an annular storage portion 340 for storing the second annular protrusion 403.SELECTED DRAWING: Figure 3

Description

The present invention relates to a sliding bearing that supports a load to be supported, and particularly to a sliding bearing that supports a vehicle body load applied to a suspension.

A strut-type suspension used for the front wheels of an automobile has a structure in which a strut assembly including a piston rod and a hydraulic shock absorber is combined with a coil spring, and the strut assembly rotates together with the coil spring when the steering is operated. For this reason, in order to support the automobile load that is applied to the strut type suspension while allowing the strut assembly to rotate smoothly, the upper mount, which is the mounting mechanism for the strut assembly to the vehicle body, and the spring seat at the upper end of the coil spring are usually installed. A bearing is arranged between the upper spring seat and the upper spring seat.

For example, Patent Document 1 discloses a sliding bearing made of synthetic resin as a bearing for a strut type suspension. This sliding bearing is interposed between the upper case, which is attached to the upper mount side, the lower case, which is attached to the upper spring seat side and is rotatably combined with the upper case, and the upper case. The strut assembly is equipped with an annular center plate that enables smooth rotation between the case and the lower case, and the center plate supports the load applied to the upper case in a slidable manner relative to the upper case. It supports the load of the vehicle body applied to the strut type suspension while allowing smooth rotation of the strut type suspension.

Japanese Patent Application Publication No. 2012-172814

In recent years, electric vehicles have become popular. Electric vehicles do not use internal combustion engines for driving force, and therefore, road noise (fine vibrations) transmitted from the tires to the vehicle body via the suspension accounts for a large proportion of the noise inside the vehicle while the vehicle is running. Therefore, reducing road noise has become a more important issue than ever for electric vehicles.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a sliding bearing capable of reducing vibrations transmitted to a supported object.

In order to solve the above problems, the present invention provides an upper case that receives a load to be supported, a lower case that is rotatably combined with the upper case, and an upper case that is interposed between the upper case and the lower case. In a sliding bearing equipped with an annular center plate that enables smooth rotation between the case and the lower case, the center plate is made of thermoplastic elastomer, and the center plate has an annular thick part and an annular thin part. The thin annular portions are arranged alternately about the same center, and the thin annular portions are not in contact with the upper case side and the lower case side, and the thick annular portions are in contact with the upper case side and the lower case side. In addition, by providing an annular accommodating part in the lower case to accommodate the lower case side of the annular thick part of the center plate, the thickness of the sliding bearing in the thrust direction is suppressed from increasing, and the annular thick part is prevented from increasing. Increased thickness.

For example, the sliding bearing of the present invention is
A sliding bearing that supports a load to be supported,
an upper case that receives the load of the support target;
a lower case rotatably combined with the upper case;
an annular center plate disposed between the upper case and the lower case to realize relative rotation between the upper case and the lower case;
The center plate is
It has an annular thick part and an annular thin part arranged alternately about the same center,
The annular thick portion is
a first annular convex portion that contacts the upper case side;
a second annular protrusion provided on the same circumference as the first annular protrusion and in contact with the lower case side;
The annular thin portion is
is not in contact with the upper case side and the lower case side,
The lower case is
It has an annular accommodating portion that accommodates the second annular protrusion.

Further, the suspension of the present invention has
A suspension used for suspending a vehicle body,
an assembly including a piston rod and a hydraulic shock absorber;
a coil spring into which the assembly is inserted and rotates together with the assembly by steering operation;
The sliding bearing;
The sliding bearing is
The upper case is attached to an upper mount that is a mechanism for attaching the suspension to the vehicle body,
The lower case is attached to the upper end side of the coil spring of the suspension.

In the present invention, the center plate is formed of a thermoplastic elastomer having a vibration damping function, and the center plate has annular thick parts and annular thin parts arranged alternately about the same center, and the annular thin parts are arranged on the upper case. The annular thick portion is in contact with the upper case side and the lower case side. Therefore, vibrations transmitted from the lower case to the upper case can be efficiently damped by the annular thick portion of the center plate.

In addition, since a thin annular portion that does not contact either the lower case side or the upper case side is arranged next to the annular thick wall portion in the radial direction, the transmission path of vibrations transmitted from the lower case to the upper case is Restricted within the thick section. For this reason, the transmission path of vibrations transmitted from the lower case to the upper case is simplified compared to when the entire center plate is made thicker and the entire upper and lower surfaces are in contact with the upper and lower cases. , resonance within the center plate can be reduced. Moreover, the strength of the center plate can be ensured while suppressing cracks (compression cracks) that tend to occur when the entire center plate made of thermoplastic elastomer is made thick.

Furthermore, by providing an annular accommodating part in the lower case to accommodate the lower case side of the annular thick part of the center plate, the thickness of the annular thick part can be increased while suppressing the increase in the thickness of the sliding bearing in the thrust direction. As a result, vibrations transmitted from the lower case to the upper case can be damped more efficiently while suppressing an increase in the thickness of the sliding bearing in the thrust direction.

As described above, according to the present invention, it is possible to provide a sliding bearing that can reduce vibrations transmitted to a supported object.

FIG. 1 is a schematic partial sectional view of a strut suspension 7 using a sliding bearing 1 according to an embodiment of the present invention. 2(A), 2(B), and 2(C) are a plan view, a bottom view, and a front view of a sliding bearing 1 according to an embodiment of the present invention, and FIG. 2(D) is a FIG. 2 is a sectional view taken along line AA of the sliding bearing 1 shown in FIG. 2(A). FIG. 3 is an enlarged view of section B of the sliding bearing 1 shown in FIG. 2(D). 4(A), FIG. 4(B), and FIG. 4(C) are a plan view, a bottom view, and a front view of the upper case 2, and FIG. 4(D) is the upper case shown in FIG. 4(A). FIG. 2 is a cross-sectional view taken along line CC of No. 2. 5(A), FIG. 5(B), and FIG. 5(C) are a plan view, a bottom view, and a front view of the lower case 3, and FIG. 5(D) is a lower case shown in FIG. 5(A). FIG. 3 is a cross-sectional view taken along line DD of No. 3. 6(A), 6(B), and 6(C) are a plan view, a bottom view, and a front view of the center plate 4, and FIG. 6(D) is a center plate shown in FIG. 6(A). 4 is a sectional view taken along line EE of FIG. 7(A) is a plan view of the sliding sheet 5, and FIG. 7(B) is a FF cross-sectional view of the sliding sheet 5 shown in FIG. 7(A). FIG. 8 is a diagram for explaining a modified example 1A of the sliding bearing 1, and is a diagram corresponding to an enlarged view of part B shown in FIG. 2(D).

An embodiment of the present invention will be described below.

FIG. 1 is a schematic partial cross-sectional view of a strut suspension 7 using a sliding bearing 1 according to the present embodiment.

The strut type suspension 7 is used to suspend a vehicle body such as an automobile, and as shown in the figure, the strut assembly 74 includes a piston rod 70, a hydraulic shock absorber 71, a bump stopper 72, and a dust boot 73; It is configured to include a coil spring 75 that is inserted and rotates together with the strut assembly 74 by steering operation, and a sliding bearing 1 for rotatably attaching the strut assembly 74 to the vehicle body (not shown).

Bump stopper 72 is attached to piston rod 70 and prevents strut assembly 74 from hitting the vehicle body when piston rod 70 is compressed. The dust boot 73 is attached to cover the piston rod 70 on which the bump stopper 72 is attached, and prevents dust, muddy water, etc. from adhering to the piston rod 70. A piston rod 70 equipped with a bump stopper 72 and a dust boot 73 is inserted into the coil spring 75, and its upper end 750 is supported by an upper spring seat 76 provided as a spring seat on the sliding bearing 1. The lower end portion 751 is supported by a lower spring seat 77 provided on the shock absorber 71 as a spring seat.

The sliding bearing 1 is disposed between the upper end 750 of the coil spring 75 and an upper mount 78 that is a mechanism for attaching the strut assembly 74 to the vehicle body.

2(A), 2(B), and 2(C) are a plan view, a bottom view, and a front view of the sliding bearing 1 according to the present embodiment, and FIG. 2(D) is a FIG. 3 is a sectional view taken along line AA of the sliding bearing 1 shown in FIG. Further, FIG. 3 is an enlarged view of section B of the sliding bearing 1 shown in FIG. 2(D).

The sliding bearing 1 includes an accommodation hole 10 for accommodating the strut assembly 74, and supports the load applied to the strut suspension 7 while allowing the strut assembly 74 accommodated in the accommodation hole 10 to rotate.

As shown in the figure, the sliding bearing 1 includes an upper case 2, a lower case 3 that is rotatably combined with the upper case 2 and forms an annular space 6 between the upper case 2, and the annular space 6. The annular center plate 4 is arranged, the annular sliding sheet 5 is arranged between the center plate 4 and the upper case 2 in this annular space 6, and the annular space 6 is filled with an annular sliding sheet 5, which is not shown. It is equipped with lubricating grease.

The upper case 2 is made of a thermoplastic resin with excellent sliding properties, such as polyacetal resin, impregnated with lubricating oil as necessary, and is attached to the upper mount 78 with the strut assembly 74 inserted therein.

4(A), FIG. 4(B), and FIG. 4(C) are a plan view, a bottom view, and a front view of the upper case 2, and FIG. 4(D) is the upper case shown in FIG. 4(A). FIG. 2 is a cross-sectional view taken along line CC of No. 2.

As shown in the figure, the upper case 2 includes an annular upper case main body 21 having an insertion hole 20 for inserting a strut assembly 74, and an upper surface 22 of the upper case main body 21. and an annular recess 25 that is formed on the lower surface 24 of the upper case body 21 and forms an annular space 6 by being rotatably combined with the lower case 3.

An annular groove 27 for mounting the sliding sheet 5 is formed in the ceiling 26 of the annular recess 25 .

The lower case 3 is made of thermoplastic resin such as polyamide resin, and is attached to the upper end portion 750 of the coil spring 75 with the strut assembly 74 inserted therein. Thereby, the lower case 3 functions as an upper spring seat 76 that is a spring seat for the upper end portion 750 of the coil spring 75. However, the upper spring seat 76 may be provided separately from the lower case 3. In this case, the lower case 3 is attached to this separately provided upper spring seat 76.

5(A), FIG. 5(B), and FIG. 5(C) are a plan view, a bottom view, and a front view of the lower case 3, and FIG. 5(D) is a lower case shown in FIG. 5(A). FIG. 3 is a cross-sectional view taken along line DD of No. 3.

As shown in the figure, the lower case 3 includes a cylindrical lower case body 31 having an insertion hole 30 for inserting the strut assembly 74, and a lower case body 31 formed on the upper end 35 side of the lower case body 31. A flange portion 32 protrudes radially outward from an outer circumferential surface 36 of the flange portion 32 and an upper surface 33 of the flange portion 32. The case body 21 includes an annular protrusion 34 that is accommodated in an annular recess 25 formed on the lower surface 24 of the case body 21 to form an annular space 6 .

An annular accommodating portion 340 is formed on the tip surface 343 of the annular convex portion 34 to accommodate second annular convex portions 403 that constitute a later-described annular thick portion 400 of the center plate 4. Here, the annular accommodating portion 340 is tapered such that the width in the radial direction R becomes narrower toward the bottom surface 341 (see FIG. 3).

The lower surface 37 of the flange portion 32 functions as an upper spring seat 76 that is a spring seat that supports the upper end portion 750 of the coil spring 75.

The center plate 4 is placed on an annular convex portion 34 formed on the upper surface 33 of the flange portion 32 of the lower case 3, and the annular concave portion 25 of the upper case 2 forms an annular space 6 together with the annular convex portion 34. The load of the vehicle body applied to the strut type suspension 7 is supported via the sliding seat 5 installed in the groove 27.

6(A), 6(B), and 6(C) are a plan view, a bottom view, and a front view of the center plate 4, and FIG. 6(D) is a center plate shown in FIG. 6(A). 4 is a sectional view taken along line EE of FIG.

The center plate 4 is made of a thermoplastic elastomer having a vibration damping function, such as a polyester elastomer, a polyurethane elastomer, or a polyolefin elastomer. A bush portion 41 is provided.

The thrust plate portion 40 has an annular thick portion 400 and an annular thin portion 401 arranged alternately in the radial direction with respect to the same center O. Here, two annular thick parts 400 and three annular thin parts 401 are provided, but each of one or more annular thick parts 400 and one or more annular thin parts 401 may be provided.

The annular thick portion 400 has a first annular convex portion 402 that protrudes in the thrust direction from the upper surface 404 of the thrust plate portion 40 and comes into contact with the sliding sheet 5 installed in the annular groove 27 of the annular recess 25 of the upper case 2; a second annular protrusion 403 that is provided on the same circumference as the first annular protrusion 402 , protrudes from the lower surface 405 of the thrust plate section 40 in the thrust direction, and is accommodated in the annular accommodating part 340 of the lower case 3; .

The second annular convex portion 403 is tapered such that the width in the radial direction R becomes narrower toward the distal end surface 406 (see FIG. 3). As a result, a wedge effect is generated by applying a load in the thrust direction, and the second annular convex portion 403 is fixed to the annular housing portion 340 provided in the annular convex portion 34 of the lower case 3, and Rotation relative to 3 is prevented.

Further, the second annular convex portion 403 projects longer from the lower surface 405 of the thrust plate portion 40 than the depth of the annular accommodating portion 340 provided in the annular convex portion 34 of the lower case 3 . Therefore, a gap is formed between the annular thin part 401 and the annular convex part 34 of the lower case 3, and the annular thin part 401 is out of contact with the lower case 3.

Further, since the first annular convex portion 402 protrudes from the upper surface 404 of the thrust plate portion 40 and comes into contact with the sliding sheet 5, a gap is formed between the annular thin portion 401 and the sliding sheet 5, and the annular thin portion 401 is out of contact with the sliding sheet 5 (upper case 2). Here, the gap formed between the annular thin part 401 sandwiched between the first annular convex part 402 of the two annular thick parts 400 and the sliding sheet 5 functions as a lubricating grease reservoir.

An annular lip portion 407 that contacts the annular recess 25 of the upper case 2 is provided on the outer peripheral edge of the annular thin portion 401 disposed on the outermost peripheral side. This lip portion 407 functions as a dust seal that prevents dust, muddy water, etc. from entering between the center plate 4 and the sliding sheet 5.

The radial bushing part 41 is provided at the inner peripheral edge of the annular thin part 401 disposed on the innermost peripheral side, and is connected to the inner peripheral side wall 250 of the annular recess 25 of the upper case 2 and the inner peripheral side wall of the annular convex part 34 of the lower case 3. 342 to support the radial load applied to the sliding bearing 1.

The sliding sheet 5 is an annular plate-shaped sliding member disposed between the center plate 4 and the upper case 2 in the annular space 6, and is installed in the annular groove 27 of the annular recess 25 of the upper case 2. , slides on the first annular convex portion 402 of the annular thick portion 400 of the center plate 4 . The sliding sheet 5 is made of fluororesin such as PTFE (polytetrafluoroethylene), modified PTFE made by copolymerizing TFE (tetrafluoroethylene) with a small amount of other raw materials (comonomer), polyacetal resin, polyethylene resin, polyamide resin, polyphenylene sulfide. It is made of synthetic resin such as resin, and if necessary, lubricants such as PTFE (excluding cases where the thermoplastic plastic is PTFE or modified PTFE), lubricating oil, silicone, graphite, etc. are added to improve sliding characteristics. I'm letting you do it. Additionally, reinforcing materials such as aramid fibers, glass fibers, and carbon fibers are added as needed to improve strength. Alternatively, the sliding sheet 5 is made of a metal with excellent sliding properties, such as a brass alloy.

7(A) is a plan view of the sliding sheet 5, and FIG. 7(B) is a FF cross-sectional view of the sliding sheet 5 shown in FIG. 7(A).

As shown in the figure, the sliding sheet 5 is located at a contact surface 50 that contacts the groove bottom of the annular groove 27 of the annular recess 25 of the upper case 2, and is located on the opposite side of the contact surface 50, It has a sliding surface 51 that comes into sliding contact with the first annular convex portion 402 of the annular thick portion 400 . Since the sliding surface 51 of the sliding sheet 5 comes into sliding contact with the first annular convex portion 402 of the center plate 4, the sliding performance between the upper case 2 and the lower case 3 is improved.

In the sliding bearing 1 having the above configuration, the center plate portion 40 of the center plate 4 is placed on the annular convex portion 34 of the lower case 3, and is a first annular convex portion constituting the annular thick portion 400 of the center plate portion 40. The portion 402 slides on the sliding sheet 5 fitted in the annular groove 27 of the annular recess 25 of the upper case 2 . Furthermore, the radial bushing portion 41 of the center plate portion 40 is disposed between the inner circumferential side wall 250 of the annular recess 25 of the upper case 2 and the inner circumferential side wall 342 of the annular convex portion 34 of the lower case 3. It slides on the inner peripheral side wall 250 of the annular recess 25 . Therefore, the upper case 2 is rotatably combined with the lower case 3 while supporting the thrust and radial loads applied to the upper case 2 via the center plate 4 and the sliding seat 5. As a result, the sliding bearing 1 supports the load of the vehicle body applied to the strut suspension 7 while allowing the strut assembly 74 of the strut suspension 7 inserted into the accommodation hole 10 to rotate.

Further, the second annular convex portion 403 constituting the annular thick portion 400 of the center plate portion 40 is accommodated in an annular accommodating portion 340 formed in the annular convex portion 34 of the lower case 3, so that no load is applied in the thrust direction. As a result of the wedge effect generated, the second annular convex portion 403 is fixed to the annular housing portion 340 provided in the annular convex portion 34 of the lower case 3 . This prevents center plate 4 from rotating relative to lower case 3.

An embodiment of the present invention has been described above.

In this embodiment, the center plate 4 is formed of a thermoplastic elastomer having a vibration damping function, and the center plate 4 has an annular thick part 400 and an annular thin part 401 arranged alternately in the radial direction with respect to the same center O. The annular thin part 401 is placed in a non-contact manner with the sliding sheet 5 attached to the upper case 2 and the lower case 3, and the annular thick part 400 is in contact with the sliding sheet 5 attached to the upper case 2 and the lower case 3. I try to stay in touch. Therefore, the vibration transmitted from the lower case 3 to the upper case 2 can be efficiently damped by the annular thick portion 400 of the center plate 4.

Further, since an annular thin part 401 that does not contact either the sliding seat 5 or the lower case 3 is arranged next to the annular thick part 400 of the center plate 4 in the radial direction, the information is transmitted from the lower case 3 to the upper case 2. The transmission path of the generated vibrations is restricted within the annular thick portion 400. Therefore, compared to the case where the entire thrust plate portion 40 of the center plate 4 is made thicker and the entire upper surface 404 and lower surface 405 are in contact with the sliding sheet 5 and the lower case 3, the The transmission path of vibrations transmitted to the center plate 4 is simplified, and resonance within the center plate 4 can be reduced. Further, the strength of the thrust plate portion 40 can be ensured while suppressing cracks (compression cracks) that tend to occur when the entire thrust plate portion 40 of the center plate 4 made of thermoplastic elastomer is made thick.

Furthermore, by providing an annular accommodating portion 340 for accommodating the second annular convex portion 403 of the annular thick portion 400 of the center plate 4 in the annular convex portion 34 of the lower case 3 on which the center plate 4 is placed, the sliding bearing Since the thickness of the annular thick portion 400 is increased while suppressing the increase in the thickness of the sliding bearing 1 in the thrust direction, the thickness of the sliding bearing 1 can be increased from the lower case 3 to the upper case 2 while suppressing the increase in the thickness of the slide bearing 1 in the thrust direction. The transmitted vibrations can be damped more efficiently.

As described above, according to the present embodiment, it is possible to provide the sliding bearing 1 that can reduce vibrations transmitted from the road surface to the vehicle body via the strut type suspension 7.

Further, in this embodiment, the annular housing portion 340 of the annular convex portion 34 of the lower case 3 is tapered such that the width in the radial direction R becomes narrower toward the bottom surface 341 thereof. Similarly, the second annular convex portion 403 of the annular thick portion 400 of the center plate 4 is also tapered such that the width in the radial direction R becomes narrower toward the distal end surface 406 thereof. As a result, when the second annular convex portion 403 of the annular thick portion 400 of the center plate 4 is housed in the annular housing portion 340 of the annular convex portion 34 of the lower case 3, a load is applied in the thrust direction, thereby creating a wedge effect. The second annular convex portion 403 is fixed to the annular housing portion 340, and rotation of the center plate 4 relative to the lower case 3 is prevented. Therefore, according to the present embodiment, there is no need to separately provide a rotation prevention mechanism for the center plate 4 with respect to the lower case 3. Further, when placing the center plate 4 on the lower case 3, there is no need to position the center plate 4 at an angle in the rotational direction with respect to the lower case 3. The cost of the sliding bearing 1 can be reduced accordingly.

Further, in this embodiment, a cylindrical radial bushing part 41 is provided on the inner peripheral edge of the annular thin part 401 disposed on the innermost peripheral side of the thrust plate part 40 of the center plate 4, and this radial bushing part 41 is Since it is disposed between the inner peripheral side wall 250 of the annular recess 25 of the upper case 2 and the inner peripheral side wall 342 of the annular convex part 34 of the lower case 3, in addition to the thrust direction load, the radial load applied to the sliding bearing 1 It can support loads in different directions.

Furthermore, in the present embodiment, in the thrust plate portion 40 of the center plate 4, a gap is formed between the annular thin portion 401 sandwiched between the first annular convex portions 402 of the two annular thick portions 400 and the sliding sheet 5. However, since it functions as a lubricating grease reservoir, more lubricating grease can be held between the center plate 4 and the sliding sheet 5. Therefore, the load applied to the strut suspension 7 can be supported for a longer period of time while allowing the strut assembly 74 of the strut suspension 7 to rotate smoothly.

Note that the present invention is not limited to the above-described embodiments, and many modifications can be made within the scope of the invention.

For example, in the above embodiment, the annular housing part 340 of the annular convex part 34 of the lower case 3 is tapered so that the width in the radial direction R becomes narrower toward the bottom surface 341, and the annular shape of the center plate 4 is tapered. The second annular convex portion 403 of the thick portion 400 is also tapered such that the width in the radial direction R becomes narrower toward the distal end surface 406 thereof. However, the present invention is not limited thereto. It is only necessary that one of the annular housing part 340 of the annular convex part 34 of the lower case 3 and the second annular convex part 403 of the annular thick part 400 of the center plate 4 be tapered. Even in this case, the second annular convex portion 403 can be fixed to the annular housing portion 340 due to the wedge effect.

Further, in the above embodiment, the sliding sheet 5 is arranged between the upper case 2 and the center plate 4, but the present invention is not limited to this, and the sliding sheet 5 may be omitted. good.

Further, in the above embodiment, the case where the radial bush portion 41 is provided on the center plate 4 has been described as an example, but the present invention is not limited to this. The radial bush portion 41 may be an independent component separated from the center plate 4. Furthermore, if the influence of the load in the radial direction is small, a center plate 4A in which the radial bush portion 41 is omitted from the center plate 4 may be used, as in a modification example 1A of the sliding bearing 1 shown in FIG. .

Further, in the above embodiment, the sliding bearing 1 that supports the load applied to the strut suspension 7 while allowing the strut assembly 74 of the strut suspension 7 to rotate has been described as an example. However, the present invention is not limited thereto. The present invention is widely applicable to bearings that support loads applied to shaft members in various mechanisms including the strut type suspension 7. For example, the present invention is applicable not only to the front wheel suspension but also to the rear wheel suspension of a four-wheeled vehicle, and the suspension type is not limited to a strut type suspension with rotation 7, but also a double wishbone type suspension and a multi-wheel suspension. It is also applicable to link type suspensions and air suspensions.

1, 1A: Slide bearing 2: Upper case 3: Lower case 4, 4A: Center plate 5: Sliding seat 6: Annular space 7: Strut type suspension 10: Accommodation hole of slide bearing 1 20: Insertion hole of upper case 2 21: Upper case body 22: Upper surface of upper case body 21 23: Mounting surface of upper case 2 24: Lower surface of upper case body 21 25: Annular recess of upper case 2 26: Ceiling of annular recess 25 27: Ceiling of annular recess 25 Annular groove 30: Insertion hole of lower case 3 31: Lower case body 32: Flange portion of lower case body 31 33: Top surface of flange portion 32 34: Annular convex portion of lower case 3 35: Upper end portion of lower case body 31 36 : Outer surface of lower case body 31 37: Bottom surface of flange portion 32 40: Thrust plate portion 41: Radial bush portion 50: Contact surface of sliding seat 5 51: Sliding surface of sliding seat 5 70: Piston rod 71: Hydraulic shock absorber 72: Bump stopper 73: Dust boot 74: Strut assembly 75: Coil spring 76: Upper spring seat 77: Lower spring seat 78: Upper mount 250: Inner peripheral side wall of annular recess 25
340: Annular accommodating portion of lower case 3 341: Bottom surface of annular accommodating portion 340 342: Inner peripheral side wall of annular convex portion 34 343: Tip surface of annular convex portion 34 400: Annular thick portion of thrust plate portion 40 401: Thrust Annular thin portion of plate portion 40 402: First annular convex portion of annular thick portion 400 403: Second annular convex portion of annular thick portion 400 404: Upper surface of thrust plate portion 40 405: Lower surface of thrust plate portion 40 406 : Tip surface of second annular convex part 403 407 : Lip part of thrust plate part 40 750 : Upper end part of coil spring 75 751 : Lower end part of coil spring 75

Claims (6)

A sliding bearing that supports a load to be supported,
an upper case that receives the load of the support target;
a lower case rotatably combined with the upper case;
an annular center plate disposed between the upper case and the lower case to realize relative rotation between the upper case and the lower case;
The center plate is
It has an annular thick part and an annular thin part arranged alternately about the same center,
The annular thick portion is
a first annular convex portion that contacts the upper case side;
a second annular protrusion provided on the same circumference as the first annular protrusion and in contact with the lower case side;
The annular thin portion is
is not in contact with the upper case side and the lower case side,
The lower case is
A sliding bearing comprising: an annular accommodating portion that accommodates the second annular convex portion. The sliding bearing according to claim 1,
The center plate is
A sliding bearing characterized in that the annular thin wall portion is disposed between the two annular thick wall portions in the radial direction. The sliding bearing according to claim 1 or 2,
The second annular convex portion is
A sliding bearing characterized in that the second annular convex portion is tapered such that the width in the radial direction becomes narrower toward the distal end surface. The sliding bearing according to any one of claims 1 to 3,
The annular accommodating portion is
A sliding bearing characterized in that the annular housing portion is tapered such that the width in the radial direction becomes narrower toward the bottom surface. The sliding bearing according to any one of claims 1 to 4,
The lower case is
further comprising an annular convex portion in which the annular accommodating portion is formed on the mounting surface of the center plate;
The upper case is
further comprising an annular recess into which the annular protrusion is inserted;
The center plate is
a cylinder disposed between an inner circumferential side wall of the annular convex portion of the lower case and an inner circumferential side wall of the annular concave portion of the upper case, and having a sliding surface with the inner circumferential side wall of the annular concave portion of the upper case; A sliding bearing further comprising a radial bush portion having a shape. A suspension used for suspending a vehicle body,
an assembly including a piston rod and a hydraulic shock absorber;
a coil spring into which the assembly is inserted and rotates together with the assembly by steering operation;
A sliding bearing according to any one of claims 1 to 5,
The sliding bearing is
The upper case is attached to an upper mount that is a mechanism for attaching the suspension to the vehicle body,
A suspension characterized in that the lower case is attached to an upper end side of a coil spring of the suspension.

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