Strut bearing device and strut suspension for vehicle

Abstract

To provide a strut bearing device which prevents abrasion of a contact surface with a steel spring support component on a lower case made of a synthetic resin while surely holding the spring support part and the lower case in an axial direction.SOLUTION: An upper spring sheet 14 made of steel has a cylindrical part 14A and a disk-like part 14B, wherein the cylindrical part 14A has an engagement hole B penetrating in a radial direction on its upper part. A lower case 3 of a strut bearing 1 has a cylindrical body 17 along an upper inner peripheral surface of the cylindrical part 14A, and the cylindrical body 17 has an engagement projection D engaged with an engagement hole B on its outer peripheral surface 17A. In the state where the engagement projection D is engaged with the engagement hole B, relative movement in an axial direction J and a circumferential direction of the upper spring sheet 14 and the lower case 3 is regulated.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] The present invention relates to a strut bearing device used in a strut suspension of a vehicle. [Background technology]

[0002] Strut suspensions, which use coil springs to support the wheels on the vehicle body and shock absorbers to absorb vertical vibrations, are widely used for the front wheels of passenger cars, with expandable struts that incorporate shock absorbers attached to the axle.

[0003] As a strut bearing device used in the upper part of a strut suspension, there is a device that axially holds a spring support part (e.g., bottom retainer 7 in Patent Document 1, bottom cup 16 in Patent Document 2) that supports the upper end of a coil spring (e.g., coil spring 2 in Patent Document 1, coil spring 17 in Patent Document 2) and a lower case made of synthetic resin of the strut bearing (e.g., bottom cover 5 in Patent Document 1, bottom cap 15 in Patent Document 2) (see, for example, Patent Documents 1 and 2).

[0004] In Patent Document 1, a resin part is brought into contact with a metal part in an elastically deformed state, and the axial retention is achieved by the frictional force generated by the elastic deformation force. That is, tongue pieces 15 provided on the axial surface 11c of the synthetic resin main body 11 of the bottom cover 5 are brought into contact with the inner peripheral surface of the axial portion 17a of the steel strut 17 of the bottom retainer 7 (Fig. 1-2). Alternatively, lugs 20 provided on the inner peripheral surface of the axial portion 17a are brought into contact with the axial surface 11c of the main body 11 (Fig. 3-4).

[0005] In Patent Document 2, the axial retention is achieved by providing a plurality of hooks 15f extending axially downward on a synthetic resin bottom cap 15. That is, ends 15g of the hooks 15f interfere with the small-diameter free end of the radial portion 16c of the steel bottom cup 16, so that the bottom cap 15 and the bottom cup 16 are fastened together in the axial direction (Figs. 1-2, 5-6). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent No. 8,496,383 [Patent Document 2] U.S. Patent No. 6,814,496 Summary of the Invention [Problem to be solved by the invention]

[0007] In the method of Patent Document 1 for axially holding the spring support part and the lower case, the tension between the bottom retainer 7 and the bottom cover 5 decreases due to the influence of deterioration over time (creep) of the resin parts, etc. This may lead to a decrease or loss of the ability to prevent the bottom retainer 7 and the bottom cover 5 from separating.

[0008] In the method of Patent Document 2 for axially holding the spring support part and the lower case, the relative movement in the circumferential direction between the bottom cap 15 and the bottom cup 16 is not restricted, so the bottom cap 15 and the bottom cup 16 slide in the circumferential direction, which causes wear on the contact surface of the synthetic resin bottom cap 15 and the steel bottom cup 16.

[0009] An object of the present invention is to provide a strut bearing device that can reliably hold the spring support component and the lower case in the axial direction, and that prevents wear on the contact surface of the synthetic resin lower case with the steel spring support component. [Means for solving the problem]

[0010] In order to solve the above problems, the strut bearing device according to the present invention comprises: A strut bearing device including a strut bearing and an upper spring seat which is a spring support component that supports an upper end of a coil spring, The strut bearing is an upper case and a lower case; an upper raceway ring held by the upper case; a lower raceway held by the lower case; a rolling element that rolls between the upper raceway ring and the lower raceway ring; Equipped with the upper case and the lower case are made of synthetic resin, the upper spring seat is made of steel; The upper spring seat is A cylindrical portion and a disk-shaped portion are provided. The cylindrical portion has, at its upper portion, an engagement hole penetrating in the radial direction or an engagement recess recessed in the inner circumferential surface, The lower case is a cylindrical body that fits along the upper inner circumferential surface of the cylindrical portion; the cylindrical body has an engaging protrusion on its outer circumferential surface that engages with the engaging hole or the engaging recess, the engaging hole, the engaging recess, and the engaging protrusion are provided at one or more locations in the circumferential direction, The structure is such that the lower case is brought into contact with the upper spring seat in an elastically deformed state, and the relative movement between the upper spring seat and the lower case is not reduced by the frictional force generated by the elastic deformation force of the lower case, The engaging protrusions are fitted into the engaging holes or the engaging recesses. of Engage The structure allows The upper spring seat and the lower case are restricted from relative movement in the axial and circumferential directions. The upper spring seat and the lower case do not slide in the circumferential direction. .

[0011] With this configuration of the strut bearing device of the present invention, the engaging protrusions on the cylindrical body of the lower case engage with the engaging holes or engaging recesses in the cylindrical portion of the upper spring seat, thereby restricting relative axial movement between the upper spring seat and the lower case, preventing axial separation between the upper spring seat and the lower case, which are spring support components, and ensuring reliable axial retention.

[0012] According to the configuration of the strut bearing device of the present invention, the engaging protrusions on the cylindrical body of the lower case engage with the engaging holes or engaging recesses on the cylindrical portion of the upper spring seat. do. This reduces the relative movement between the upper spring seat and the lower case in the circumferential direction. The structure does not reduce the frictional force by using the frictional force, but rather the structure in which the engaging protrusions are engaged with the engaging holes or the engaging recesses, so that the upper spring seat and the lower case do not slide in the circumferential direction. Therefore, since the lower case can be positioned circumferentially relative to the upper spring seat, the upper spring seat and the lower case do not slide circumferentially, and the contact surface between the synthetic resin lower case and the steel upper spring seat does not wear.

[0013] Here, in a preferred embodiment, the upper surface of the engaging protrusion on the lower case is an approximately horizontal plane or the side surface of a cylinder extending in an approximately horizontal direction, and the lower surface of the engaging protrusion is an inclined surface whose diameter decreases as it goes downward.

[0014] With this configuration of the strut bearing device of the present invention, the lower case can be easily lowered relative to the upper spring seat by elastically deforming the lower case, with the inclined surfaces of the lower surfaces of the engaging protrusions of the synthetic resin lower case aligning with the upper inner circumferential surface of the cylindrical portion of the steel upper spring seat. This allows the engaging protrusions of the lower case to easily engage with the engaging holes or engaging recesses of the upper spring seat.

[0015] Furthermore, when the engaging protrusion is engaged with the engaging hole or the engaging recess, the upper surface of the engaging protrusion, which is an approximately horizontal plane or a cylindrical side extending in an approximately horizontal direction, is abutted against the upper wall portion of the engaging hole or the engaging recess, thereby reliably preventing axial separation between the upper spring seat, which is a spring support part, and the lower case.

[0016] In order to solve the above problems, the strut bearing device according to the present invention comprises: A strut bearing device including a strut bearing and an upper spring seat which is a spring support component that supports an upper end of a coil spring, The strut bearing is an upper case and a lower case; an upper raceway ring held by the upper case; a lower raceway held by the lower case; a rolling element that rolls between the upper raceway ring and the lower raceway ring; Equipped with the upper case and the lower case are made of synthetic resin, the upper spring seat is made of steel; The upper spring seat is A cylindrical portion and a disk-shaped portion are provided. The cylindrical portion has an engaging protrusion at an upper portion thereof that protrudes radially inward, The lower case is a cylindrical body that fits along the upper inner circumferential surface of the cylindrical portion; the cylindrical body has an engagement hole penetrating in the radial direction or an engagement recess recessed in the outer circumferential surface, which is engaged with the engagement protrusion, the engaging protrusion, the engaging hole, and the engaging recess are provided at one or more locations in the circumferential direction, The structure is such that the lower case is brought into contact with the upper spring seat in an elastically deformed state, and the relative movement between the upper spring seat and the lower case is not reduced by the frictional force generated by the elastic deformation force of the lower case, The engaging protrusion has the engaging hole or the engaging recess. of Engage The structure allows The upper spring seat and the lower case are restricted from relative movement in the axial and circumferential directions. The upper spring seat and the lower case do not slide in the circumferential direction. .

[0017] With this configuration of the strut bearing device of the present invention, the engaging protrusions on the cylindrical portion of the upper spring seat engage with the engaging holes or engaging recesses on the cylindrical body of the lower case, thereby restricting relative axial movement between the upper spring seat and the lower case, preventing axial separation between the upper spring seat and the lower case, which are spring support components, and ensuring reliable axial retention of them.

[0018] According to the configuration of the strut bearing device of the present invention, the engaging protrusions on the cylindrical portion of the upper spring seat are engaged with the engaging holes or engaging recesses on the cylindrical body of the lower case. do. This reduces the relative movement between the upper spring seat and the lower case in the circumferential direction. The structure does not reduce friction by frictional force, but the structure engages the engaging hole or the engaging recessed portion with the engaging protrusion, so that the upper spring seat and the lower case do not slide in the circumferential direction. Therefore, since the lower case can be positioned circumferentially relative to the upper spring seat, the upper spring seat and the lower case do not slide circumferentially, and the contact surface of the synthetic resin lower case with the steel upper spring seat does not wear out.

[0019] A strut suspension for a vehicle according to the present invention includes the strut bearing device. [Effects of the Invention]

[0020] As described above, the strut bearing device and vehicle strut suspension of the present invention reliably holds the upper spring seat, which is a spring support component, and the lower case in the axial direction, and prevents wear on the contact surface of the synthetic resin lower case where the steel upper spring seat comes into contact. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic partial cross-sectional view of a strut-type suspension for a vehicle equipped with a strut bearing device according to an embodiment of the present invention; [Figure 2A] FIG. 2 is an enlarged longitudinal cross-sectional view of a main portion showing the strut bearing device, an upper insulator, and a coil spring. [Figure 2B] FIG. 2B is an enlarged view of the boxed area a in FIG. 2A. [Figure 3] FIG. 10 is a perspective view from below showing the lower case and the upper spring seat removed and separated. [Figure 4] FIG. 10 is a front view showing the state in which the lower case and the upper spring seat have been removed and separated. [Figure 5] 5 is a front view similar to FIG. 4, showing a modified example of an engaging protrusion and an engaging hole. [Figure 6] 5 is a front view similar to FIG. 4, showing another modified example of the engaging protrusion and the engaging hole. [Figure 7A] 2B is an enlarged longitudinal cross-sectional view of a main part similar to FIG. 2A, showing an example in which an engagement hole is replaced with an engagement recess. [Figure 7B] FIG. 7B is an enlarged view of the boxed area b in FIG. 7A. [Figure 8] FIG. 10 is an enlarged longitudinal cross-sectional view of a main portion showing a modified example in which an engaging protrusion is provided on the upper spring seat and an engaging hole is provided on the lower case. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0023] In this specification, the direction parallel to the rotation axis O (see Figure 1) of the strut bearing device 1 is referred to as the "axial direction" (see, for example, arrow J in Figure 1), and the direction perpendicular to the rotation axis O is referred to as the "radial direction" (see, for example, arrow R in Figure 1), and views viewed from the radial direction R (Figures 4 to 6) are referred to as front views.

[0024] In this specification, the radial direction approaching the rotation axis O is referred to as the "radially inward direction" (see, for example, arrow RI in FIG. 1), and the radial direction moving away from the rotation axis O is referred to as the "radially outward direction" (see, for example, arrow RO in FIG. 1). Furthermore, if the rotation axis O is defined as the vertical direction, the horizontal direction perpendicular to the radial direction centered on the rotation axis O is referred to as the "circumferential direction" (see, for example, arrow E in FIG. 3).

[0025] <Strut suspension> The strut suspension S of a vehicle shown in the partial cross-sectional schematic diagram of Figure 1 is used with an expandable strut 10 incorporating a shock absorber fixed to an axle (not shown) and an upper mount 16 fixed to the vehicle body.

[0026] The upper part of the strut suspension S is equipped with a strut bearing 1 that supports the vehicle body and oscillates and rotates as the direction of the steered wheels changes due to steering operation. The oscillating angle of the strut bearing 1 is determined according to the allowable steering angle of the wheels, and is set, for example, in the range of 40° to 50°.

[0027] The outer diameter side RO of the strut 10 is provided with a coil spring 11, which serves as a suspension spring, and a dust boot 12, which protects the shock absorber oil seal from foreign matter such as sand. The strut suspension S is equipped with a spring support part 13, which supports the upper end of the coil spring 11. As shown in the vertical cross section of Figure 2A, the spring support part 13 consists of an upper spring seat 14 and an upper insulator 15.

[0028] <Strut bearing device> As shown in the schematic diagram of FIG. 1 and the vertical cross-sectional view of FIG. 2A, the strut bearing device A includes a strut bearing 1 and an upper spring seat 14 which is a spring support part 13 that supports the upper end of a coil spring 11.

[0029] The strut bearing 1 includes an upper case 2, a lower case 3, an upper raceway ring 4, an upper raceway ring 5, rolling elements 6, a cage 7, an inner diameter side seal 8, an outer diameter side seal 9, and the like.

[0030] Upper case 2 is fixed to the upper end of strut 10, and lower case 3 receives upper spring seat 14 from above. Upper raceway ring 4 is held in upper case 2, and lower raceway ring 5 is held in lower case 3. Rolling elements 6 roll between upper raceway ring 4 and lower raceway ring 5, and cage 7 holds adjacent rolling elements 6 so that they do not come into contact with each other.

[0031] The inner diameter side seal 8 is located on the radially inner side RI of the rolling element 6, and the outer diameter side seal 9 is located on the radially outer side RO of the rolling element 6.

[0032] The upper and lower raceways 4, 5, and upper spring seats 14 are made of steel, and are formed by pressing steel plates and then quench-hardened after processing. The upper and lower cases 2, 3 are made of synthetic resin, and the inner seal 8 and outer seal 9 are made of elastomer.

[0033] The synthetic resin used for the upper case 2 and the lower case 3 is, for example, a polyamide resin (PA66, PA46, PA612, PA6, PA9T, PA10T, etc.), and contains 20 to 60 wt % of glass fiber (GF) as a reinforcing fiber.

[0034] The elastomers used for the inner seal 8 and outer seal 9 are thermoplastic elastomers (TPE), such as TPS (styrene-based), TPO (olefin-based), TPU (urethane-based), TPA (amide-based), and TPEE (ester-based), and the rubber materials are nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), acrylic rubber (ACM), ethylene-acrylic rubber (AEM), fluororubber (FKM, FPM), silicone rubber (VQM), etc. The rubber materials can be one type or an appropriate blend of two or more types of rubber.

[0035] <Molding of upper and lower cases> The upper case 2 and the lower case 3 are formed by injection molding. That is, the upper case 2 is formed by injecting molten synthetic resin into a mold cavity through a gate of the mold. The lower case 3 is formed by injecting molten synthetic resin into a mold cavity through a gate of the mold.

[0036] <Upper spring seat> As shown in the vertical cross-sectional view of Fig. 2A, Fig. 2B which is an enlarged view of the boxed area a in Fig. 2A, the perspective view of Fig. 3, and the front view of Fig. 4, the upper spring seat 14 has a cylindrical portion 14A and a disk-shaped portion 14B extending radially outward RO from the upper end of the cylindrical portion 14A. The upper part of the cylindrical portion 14A has a square hole 21 which is an engagement hole B that penetrates in the radial direction R.

[0037] <Lower case> The lower case 3 has a cylindrical body 17 that fits along the upper inner peripheral surface of the cylindrical portion 14A of the upper spring seat 14. The cylindrical body 17 has on its outer peripheral surface 17A a rectangular convex piece 18 that serves as an engaging convex portion D that engages with a rectangular hole 21 that serves as an engaging hole B of the upper spring seat 14.

[0038] The upper surface of the rectangular convex piece 18 is a substantially horizontal plane H1, and the lower surface of the rectangular convex piece 18 is an inclined surface F that tapers downward. As shown in the perspective view of Figure 3 and the front view of Figure 4, by bringing the upper spring seat 14 and the lower case 3 close together and aligning the upper part of the inner circumferential surface of the cylindrical portion 14A of the upper spring seat 14, which is made of steel, with the inclined surface F on the lower surface of the rectangular convex piece 18, which is the engaging protrusion D of the lower case 3, which is made of synthetic resin, the lower case 3 is elastically deformed, and the lower case 3 can be easily lowered relative to the upper spring seat 14.

[0039] 2A and 2B, the rectangular protruding piece 18, which is the engaging protrusion D of the lower case 3, can be easily engaged with the rectangular hole 21, which is the engaging hole B of the upper spring seat 14. When the rectangular protruding piece 18 is engaged with the rectangular hole 21 as shown in Figures 2A and 2B, relative movement in the axial direction J between the upper spring seat 14 and the lower case 3 is restricted. Furthermore, because the upper surface, which is the approximately horizontal plane H1 of the rectangular protruding piece 18, is abutted against the upper wall portion K of the rectangular hole 21, separation in the axial direction J between the upper spring seat 14, which is the spring support part 13, and the lower case 3 is reliably prevented.

[0040] As shown in the longitudinal cross-sectional view of FIG. 2B, the relationship between the radial height G, which is the height of the engagement protrusion D, that is, the protrusion of the rectangular protrusion piece 18 in the radial outward direction RO, the radial distance I from the tip of the rectangular protrusion piece 18 to the outer peripheral surface of the cylindrical portion 14A, and the thickness T of the cylindrical portion 14A is G+I=T, and when T is, for example, 2 mm, the radial height G of the rectangular protrusion piece 18 may be, for example, about 0.5 to 1.0 mm.

[0041] As shown in the vertical cross-sectional views of Figures 2A and 2B, when the rectangular protrusion 18 of the lower case 3 is engaged with the rectangular hole 21 of the upper spring seat 14, the rectangular protrusion 18 is engaged with the rectangular hole 21 having the shape shown in the perspective view of Figure 3 and the front view of Figure 4. Therefore, relative movement between the upper spring seat 14 and the lower case 3 in the circumferential direction E shown in Figure 3 is restricted.

[0042] The assembly of the strut bearing 1 and upper spring seat 14 is fixed in its mounting position relative to the vehicle in the circumferential direction E. In the strut bearing device A according to an embodiment of the present invention, the lower case 3 of the strut bearing 1 is restricted from moving relative to the upper spring seat 14 in the circumferential direction E, as described above.

[0043] Therefore, since the lower case 3 can be positioned relative to the upper spring seat 14 in the circumferential direction E, the upper spring seat 14 and the lower case 3 do not slide in the circumferential direction E, and the contact surface between the synthetic resin lower case 3 and the steel upper spring seat 14 does not wear.

[0044] <Modified Example> The engaging hole B of the upper spring sheet 14 and the engaging convex portion D of the lower case 3 may be an oblong hole 22 and an oblong convex piece 19, respectively, as shown in the front view of FIG. 5, or may be a round hole 23 and a round convex piece 20, as shown in the front view of FIG. 6. The upper surface of the round convex piece 20 in FIG. 6 is not a substantially horizontal plane H1, but a side surface H2 of a cylinder extending in a substantially horizontal direction.

[0045] As shown in the enlarged longitudinal sectional view of the main part of FIG. 7A and FIG. 7B which is an enlarged view of the surrounded portion b in FIG. 7A, the cylindrical portion 14A of the upper spring sheet 14 may have an engaging concave portion C with a depressed inner peripheral surface instead of the engaging hole B. Even in such a configuration, with the engaging convex portion D engaged with the engaging concave portion C, the relative movement of the upper spring sheet 14 and the lower case 3 in the axial direction J and the circumferential direction E is restricted. The reference sign K in FIG. 7B indicates the upper wall portion of the engaging concave portion C.

[0046] As shown in the longitudinal sectional view of FIG. 7B, the relationship among the radial height G which is the protruding height of the engaging convex portion D in the radially outward direction RO, the radial depth L of the engaging concave portion C, and the wall thickness T of the cylindrical portion 14A is G < L < T. When T is, for example, 2 mm, L may be about 1.0 to 1.5 mm, and G may be less than L and about 0.5 to 1.0 mm. In addition, when machining to provide the engaging concave portion C in the cylindrical portion ¼A of the upper spring sheet 14 causes the outer peripheral surface of the cylindrical portion 14A to protrude in the radially outward direction RO and this protruding portion interferes with peripheral components, an engaging hole B penetrating in the radial direction R may be provided instead of the engaging concave portion C.

[0047] In the above description, the engaging hole B and the engaging convex portion D, or the engaging concave portion C and the engaging convex portion D may be provided at one or more locations in the circumferential direction.

[0048] As shown in the enlarged longitudinal cross-sectional view of a main portion in Figure 8, an engaging protrusion M that protrudes radially inward RI may be provided on the top of the cylindrical portion 14A of the upper spring seat 14, and an engaging hole N that penetrates in the radial direction R and engages with the engaging protrusion M may be provided in the cylindrical body 17 of the lower case 3. Even with this structure, when the engaging hole N is engaged with the engaging protrusion M, relative movement between the upper spring seat 14 and the lower case 3 in the axial direction J and circumferential direction E is restricted. Note that a structure may also be used in which an engaging recess is provided in the cylindrical body 17 of the lower case 3, with the outer circumferential surface 17A recessed, and the engaging recess is engaged with the engaging protrusion M.

[0049] In the above description, the engaging protrusion M and the engaging hole N, or the engaging protrusion M and the engaging recess may be provided at one or more locations in the circumferential direction.

[0050] The above description of the embodiments is given by way of example only and is not intended to be limiting, and various improvements and modifications can be made without departing from the scope of the present invention. [Explanation of symbols]

[0051] 1 strut bearing 2 Upper case 3 Lower case 4 Upper raceway 5 Lower raceway 6 rolling elements 7 Cage 8 Inner diameter seal 9 Outer diameter seal 10 Strut 11 Coil spring 12 Dust Boots 13 Spring support parts 14 Upper spring seat 14A Cylindrical part 14B Disc-shaped part 15 Upper insulator 16 Upper mount 17 Cylinder 17A Outer surface 18 Rectangular convex piece 19 Oblong convex piece 20 Round convex piece 21 square hole 22 oblong hole 23 Round Hole A Strut bearing device B Engagement hole that penetrates in the radial direction C Engagement recess with a recessed inner surface D Engagement protrusion E Circumferential direction F Inclined surface G Height of the engaging protrusion H1 Almost horizontal plane H2 Side of a cylinder extending almost horizontally I Radial distance from the tip of the engaging protrusion to the outer surface of the cylindrical part J-axis direction K Upper wall of engagement hole or engagement recess L Radial depth of the engagement recess M Engagement protrusion N Radial through hole O Rotation axis R Radial direction RI radially inward RO radially outward S strut suspension T: Wall thickness of cylindrical part

Claims

1. A strut bearing device including a strut bearing and an upper spring seat which is a spring support component that supports an upper end of a coil spring, The strut bearing is an upper case and a lower case; an upper raceway ring held by the upper case; a lower raceway held by the lower case; a rolling element that rolls between the upper raceway ring and the lower raceway ring; Equipped with the upper case and the lower case are made of synthetic resin, the upper spring seat is made of steel; The upper spring seat is A cylindrical portion and a disk-shaped portion are provided. The cylindrical portion has, at its upper portion, an engagement hole penetrating in the radial direction or an engagement recess recessed in the inner circumferential surface, The lower case is a cylindrical body that fits along the upper inner circumferential surface of the cylindrical portion; the cylindrical body has an engaging protrusion on its outer circumferential surface that engages with the engaging hole or the engaging recess, the engaging hole, the engaging recess, and the engaging protrusion are provided at one or more locations in the circumferential direction, The structure is such that the lower case is brought into contact with the upper spring seat in an elastically deformed state, and the relative movement between the upper spring seat and the lower case is not reduced by the frictional force generated by the elastic deformation force of the lower case, Due to the structure in which the engaging protrusions engage with the engaging holes or the engaging recesses, the relative movement between the upper spring seat and the lower case in the axial and circumferential directions is restricted, and the upper spring seat and the lower case do not slide in the circumferential direction. Strut bearing assembly.

2. The upper surface of the engaging protrusion of the lower case is A substantially horizontal surface or a side surface of a cylinder extending in a substantially horizontal direction, The lower surface of the engaging protrusion is It is an inclined surface that decreases in diameter as it goes downward.

2. The strut bearing assembly of claim 1.

3. A strut bearing device including a strut bearing and an upper spring seat which is a spring support component that supports an upper end of a coil spring, The strut bearing is an upper case and a lower case; an upper raceway ring held by the upper case; a lower raceway held by the lower case; a rolling element that rolls between the upper raceway ring and the lower raceway ring; Equipped with the upper case and the lower case are made of synthetic resin, the upper spring seat is made of steel; The upper spring seat is A cylindrical portion and a disk-shaped portion are provided. The cylindrical portion has an engaging protrusion at an upper portion thereof that protrudes radially inward, The lower case is a cylindrical body that fits along the upper inner circumferential surface of the cylindrical portion; the cylindrical body has an engagement hole penetrating in the radial direction or an engagement recess recessed in the outer circumferential surface, which is engaged with the engagement protrusion, the engaging protrusion, the engaging hole, and the engaging recess are provided at one or more locations in the circumferential direction, The structure is such that the lower case is brought into contact with the upper spring seat in an elastically deformed state, and the relative movement between the upper spring seat and the lower case is not reduced by the frictional force generated by the elastic deformation force of the lower case, Due to the structure in which the engaging protrusions are engaged with the engaging holes or the engaging recesses, the relative movement between the upper spring seat and the lower case in the axial and circumferential directions is restricted, and the upper spring seat and the lower case do not slide in the circumferential direction. Strut bearing assembly.

4. A strut suspension for a vehicle, comprising the strut bearing device according to any one of claims 1 to 3.

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