JP3937042B2 - Strut mount - Google Patents

Description

  The present invention relates to a strut mount used for a strut suspension of a vehicle.

  A strut mount is an anti-vibration device that is interposed between an upper end of a piston rod of a shock absorber and a vehicle body in an automobile strut suspension to attenuate or reduce vibration transmitted from the road surface to the body. .

  As such a strut mount, the following Patent Document 1 proposes a type that can be assembled in a non-fastened state with respect to the body. That is, this document has a rigid inner member and an outer member, and a rubber elastic body integrally connecting them, and is directed upward from below with respect to a recess for fitting provided in a vehicle body. There is disclosed a strut mount that is fitted to the body and is assembled to the body while being pressed against the inner surface of the recess by the load of the body without being fastened to the body with a bolt.

In such a type of strut mount, for example, when the tire falls into a concave portion and the piston rod is pulled downward, the strut mount is separated from the body and the body floats. In order to avoid this, a rebound stopper that restricts excessive relative displacement of the piston rod downward is provided. In the above document, the rebound stopper is fixed to the upper end portion of the piston rod, A stopper rubber portion is provided that contacts the upper wall portion of the body downward.
JP 2004-232824 A

  In the strut mount having the rebound stopper as described above, abnormal noise may occur when the rebound stopper contacts the body. In particular, when the piston rod is displaced in a twisting direction that tilts obliquely during wheel steering, the stopper rubber part of the rebound stopper may come into contact with the upper wall part of the body so as to be displaced laterally. Will occur. In order to prevent such abnormal noise, for example, the contact surface of the stopper rubber part with the body may be a rough surface made of fine irregularities such as wrinkles, but the rough surface exhibits normal stopper action. Although an anti-sounding effect can be expected at the time of contact in the axial direction during contact, sufficient contact with the above-mentioned contact at the time of twisting where a force that causes contact from an oblique direction and shifts laterally after contact acts is sufficient. The sound prevention effect cannot be demonstrated.

  The present invention has been made in view of such problems, and provides a strut mount that can effectively prevent abnormal noise due to contact between the rebound stopper and the body when the piston rod is twisted and displaced. With the goal.

A strut mount according to the present invention includes an inner member attached to a piston rod side of a shock absorber, an outer member surrounding the inner member and attached to a body side, and interposed between the inner member and the outer member. An anti-vibration base made of a rubber-like elastic body that joins the members, and is a recess provided in the body and opened downward, the recess having an opening in the upper wall portion of the recess In the strut mount that is fitted from below and is assembled in a state of being sandwiched between the body and the piston rod by the load of the body without the outer member being fastened to the body, the piston A rebound stopper attached to the upper end of the rod for limiting the relative displacement of the piston rod downward; A stopper plate portion disposed to be opposed to the upper wall portion around the opening of the recess with a gap therebetween, and a stopper rubber portion provided on the lower surface of the stopper plate portion, A plurality of spherical crown-shaped projections are arranged on the lower surface of the rubber portion at equal intervals over the entire circumference in the circumferential direction, and the interval between the spherical crown-shaped projections adjacent in the circumferential direction is set to be equal to or less than the width of the spherical crown-shaped projection, The coronal protrusion is arranged so as to come into contact with a curved surface portion that reaches the side wall portion while curving radially outward and downward from the upper wall portion of the recess when the piston rod is twisted and displaced .

According to the above structure, since a plurality of spherical crown-shaped protrusions are arranged in the circumferential direction as protrusions for preventing abnormal noise on the lower surface of the stopper rubber part of the rebound stopper that contacts the upper wall part of the body recess, the normal stopper action is provided. It is possible to prevent abnormal noise due to contact between the stopper rubber portion and the body even when the piston rod is twisted and displaced, such as during steering of a wheel, as well as when contacting in the axial direction. In particular, when the piston rod is twisted and displaced, a force that shifts in the lateral direction after contact with the body acts on the protrusion, but the above-mentioned spherical crown-shaped protrusion has a followability to such a lateral displacement. Therefore, it is excellent in noise prevention effect. Also, the piston rod rotates while twisting, but if it is a crown-shaped projection, it has no directivity, so it can follow the displacement in the circumferential direction. Excellent vibration effect. Moreover, since the spherical crown-shaped projection is arranged so as to contact the curved surface portion of the recess at the time of twisting displacement, the contact with the body at the time of twisting displacement is relaxed, and in particular, a force that shifts laterally after the contact is applied. Sometimes, it is possible to suppress the generation of noise by suppressing the accumulation of the energy.

  In the strut mount of the present invention, when the spherical crown-shaped projections are arranged in parallel on the lower surface of the stopper rubber portion in an inner and outer double ring shape, it is avoided as much as possible that the stopper rubber portion main body contacts the body at the time of twisting displacement. be able to.

  In this case, if the spherical crown-shaped projections are alternately arranged in the circumferential direction in the inner annular row and the outer annular row, the noise preventing effect at the time of twisting displacement can be further enhanced.

In strut mount of the present invention, since the distance between the sphere coronal projection which is adjacent in the circumferential direction is set to less than or equal to the width of the ball coronal projection, upon contact with the body during twisting displacement, independently of each other protrude It is possible to make contact with the body with as many protrusions as possible, while sharing the load.

  In the strut mount of the present invention, the height of the spherical crown-shaped protrusion may be set to be equal to or greater than the thickness of the stopper rubber portion main body. Providing protrusions with a high protrusion height in this manner enhances the follow-up performance, and prevents the stopper rubber portion body from coming into contact with the body at the time of twisting displacement, resulting in an excellent noise prevention effect.

  Further, in the strut mount of the present invention, an angle formed by a tangent line that contacts both the spherical crown-shaped protrusion and the tip of the stopper rubber part main body and the lower surface of the stopper rubber part main body is greater than a maximum twist angle of the piston rod. Is preferably set larger. Accordingly, when the piston rod is twisted and displaced, the stopper rubber portion main body can be prevented from coming into contact with the body before the spherical crown-like projection, and an effect of preventing abnormal noise can be exhibited. In addition, when the spherical crown-shaped projections are arranged side by side in an inner and outer double ring shape, the outer annular row of spherical crown-shaped projections may be set so as to satisfy this relationship.

  In the strut mount of the present invention, the spherical crown-shaped protrusion may be formed in a spherical crown shape having a height greater than the radius. Providing protrusions with a high protrusion height in this manner enhances the follow-up performance, and prevents the stopper rubber portion body from coming into contact with the body at the time of twisting displacement, resulting in an excellent noise prevention effect.

  With the strut mount of the present invention, the contact between the stopper rubber part and the body not only during the axial contact when the normal stopper action is exerted but also when the piston rod is twisted and displaced, such as during wheel steering. Can be effectively prevented.

  Hereinafter, a strut mount according to an embodiment of the present invention will be described with reference to the drawings.

[First embodiment]
FIG. 1 is a sectional view showing a state in which a strut mount 10 according to a first embodiment of the present invention is assembled to a vehicle, and FIG. 2 is an exploded view thereof.

  In the figure, reference numeral 12 denotes a shock absorber piston rod, reference numeral 14 denotes a vehicle body, reference numeral 16 denotes a spring seat for receiving the upper end of the coil spring, and reference numeral 18 denotes a bearing fixed to the upper end portion 12a of the piston rod by a nut 20. .

  The plate-shaped body 14 is provided with a recess 22 that is opened downward by forming a concave shape upward. The recess 22 is formed in a tapered cylindrical shape with a side wall 24 having a smaller diameter toward the upper side, and a circular opening 28 is provided in the upper wall 26. The upper wall portion 26 extends inward in the radial direction from the upper end of the side wall portion 24, and is formed in a ring plate shape by providing an opening 28 inside thereof, and the piston rod is formed in the opening portion 28 from below. The upper end portion 12a is inserted.

  The strut mount 10 is interposed between the metal inner member 30 attached to the upper end portion 12a of the piston rod, the metal outer member 32 attached to the body 14 side, and these members 30 and 32. And an anti-vibration base 34 made of a rubber-like elastic body to be joined, and is fitted into the recess 22 of the body 14 from below, so that the outer member 32 is not fastened to the body 14 with bolts. This is a non-fastening type strut mount that is assembled in a state of being sandwiched between the body 14 and the piston rod 12 by a load.

  The outer member 32 is a member that concentrically surrounds the inner member 30, and has a tapered cylindrical shape that gradually becomes a small diameter upward so as to be fitted to the inner periphery of the side wall portion 24 of the recess 22. Specifically, in this example, the central portion in the axial direction is recessed inward to form a concave groove portion 32a extending in the circumferential direction.

  The inner member 30 is a member that is fitted on the outer peripheral surface of the bearing 18 provided on the upper end portion 12a of the piston rod, and has a tapered cylindrical shape that gradually decreases in diameter upward. Further, the lower end portion 30 a of the inner member 30 extends radially outward from the opening portion 28 of the recess 22, that is, provided so as to overlap the upper wall portion 26 and the side wall portion 24 in the vertical direction. As a result, the piston rod 12 is prevented from coming off upward. More specifically, in this example, the inner member 30 bulges outward at the fitting portion 30b with the bearing 18, and further, the outer member 30 is secured on the outer side so that a predetermined gap is secured between the lower end portion 30a and the spring seat 16. It is formed in a bulging shape.

  The inner peripheral surface of the inner member 30 and the outer peripheral surface of the outer member 32 are each covered with a thin rubber, and are fitted between the bearing 18 and the recess 22 of the body with the thin rubber interposed therebetween. It is configured to be.

  A rebound stopper 36 is attached to the upper end portion 12a of the piston rod 12 to limit excessive relative displacement downward. The rebound stopper 36 includes a stopper fitting 40 that is fixed to the piston rod 12 using a nut 38, and a stopper rubber portion 42 provided at the tip of the stopper fitting 40.

  The stopper fitting 40 has a circular mounting base 44 provided in the center with a hole 44a through which the upper end 12a of the piston rod is inserted, and a cylindrical shape extending upward from the periphery of the mounting base 44 through the inside of the opening 28. A peripheral wall portion 46 and a stopper that extends radially outward from the upper end of the peripheral wall portion 46 and is disposed to face the upper wall portion 26 around the opening 28 of the recess 22 with a gap 50 therebetween. It consists of a plate part 48. The stopper plate portion 48 has a flat plate shape parallel to the upper wall portion 26 of the recess 22 and has a ring shape that is opposed to the entire circumference of the upper wall portion 26.

  The stopper rubber portion 42 is vulcanized and formed so as to cover the lower surface, the front end surface, and the upper surface of the stopper plate portion 48 so that a gap 50 is secured between the stopper rubber portion 42 and the upper wall portion 26 in a state where the stopper rubber portion 42 is assembled to the vehicle. Is provided. The thickness A (see FIG. 4) of the stopper rubber portion main body 42a provided on the lower surface of the stopper plate portion 48 is in contact with the upper wall portion 26 of the body 14 when the piston rod 12 is excessively displaced downward. It is set to be equal to or greater than the minimum thickness capable of absorbing the impact between the body 14 and the rebound stopper 36 when exerting the action, and in this example, A = 1.5 mm.

  On the lower surface 42b of the stopper rubber portion 42, a plurality of spherical crown-shaped protrusions 52 that protrude in a spherical shape independently of each other are arranged side by side in the circumferential direction. As shown in FIG. 3, the spherical crown-shaped projections 52 are arranged at equal intervals over the entire circumference on the lower surface 42 b of the stopper rubber portion 42 and in a row of rings. In this example, a total of 30 spherical crown-shaped protrusions 52 are provided every 12 ° in the circumferential direction. Further, as shown in FIG. 1, the spherical crown-shaped protrusion 52 is disposed at a position facing the upper wall portion 26 of the recess 22 in the axial direction, and thereby, when a normal stopper action is exhibited. At the time of abutment in the axial direction, the spherical crown-shaped projection 52 abuts on the upper wall portion 26 before the stopper rubber portion main body 42a, so that an abnormal noise due to a hitting sound can be prevented.

  As shown in FIG. 4, the crown-shaped projection 52 is a hemispherical projection in the present embodiment, and a curved connection that gently connects the hemispherical spherical surface and the lower surface 42b of the stopper rubber portion at the base portion thereof. A surface portion 54 is provided. The height B of the spherical crown-shaped protrusion 52 is equal to or greater than the thickness A of the stopper rubber portion main body 42a, and is formed as a protrusion that is clearly different from the unevenness such as so-called embossing. In this example, the spherical crown-shaped protrusion 52 has a diameter of 3 mm, and the height B is set to B = 1.7 mm, which is larger than the thickness A. The height B of the spherical crown protrusion 52 is preferably 1 to 2 times the thickness A of the stopper rubber portion main body 42a. Moreover, it is preferable that the spherical crown-shaped protrusion 52 has a spherical crown shape having a height equal to or greater than the radius in order to improve the following ability. In this example, the height B is 1.7 mm with respect to the radius R of the spherical crown R = 1.5 mm. This height B is preferably 1.0 to 1.5 times the radius R of the spherical crown.

  In the longitudinal cross-sectional shape shown in FIG. 4, the spherical crown protrusion 52 is an angle formed by a tangent line L that is in contact with the tip end portion 42 c of the stopper rubber portion main body 42 a and the spherical crown protrusion 52 and the lower surface 42 b of the stopper rubber portion main body 42 a. α is set to be larger than the maximum twist angle β of the piston rod 12. As shown in FIG. 5, the piston rod 12 is displaced in a twisting direction so as to tilt obliquely about the center O of the bearing 18 as shown in FIG. 5, but the maximum twisting angle β is determined by the vehicle, It is 7 to 8 °, and at most about 10 °. In the present embodiment, the angle α is larger than the maximum twist angle β, specifically set to 15 ° or more, and is set to about 20 ° in the example of FIG.

  As shown in FIG. 3, the distance C between adjacent spherical crown projections 52 is set to be equal to or less than the width D of the spherical crown projections. Specifically, in this example, the width D, that is, the diameter of the spherical crown-shaped projections 52 is 3 mm, and the interval C between the spherical crown-shaped projections 52 is set to about 2.8 mm, which is narrower than this. The interval C is preferably 0.5 to 1 times the width D of the spherical crown protrusion 52.

  As shown in FIG. 2, the strut mount 10 of the present embodiment configured as described above is fitted into the recess 22 of the body 14 upward from below, and the piston rod 12 to which the bearing 18 is fixed is inserted from below. The rebound stopper 36 is fastened to the upper end portion 12a of the piston rod 12 with a nut 38 from above the opening 28 of the piston rod 12, and is assembled to the body 14 as shown in FIG. Is held in a pressed state. At the time of this assembly, the rebound stopper 36 is provided with the spherical crown-like projections 52 at equal intervals over the entire circumference as described above, so there is no directionality in the circumferential direction and excellent workability.

  In the assembled strut mount 10, as shown in FIG. 1, a gap 50 is secured between the stopper rubber portion 42 of the rebound stopper 36 and the upper wall portion 26 of the body recess 22. When the piston rod 12 is excessively displaced downward during traveling of the vehicle, the stopper rubber portion 42 comes into contact with the upper wall portion 26 and exerts a stopper action. At this time, the stopper rubber portion 42 is first formed into a spherical crown shape. Since the protrusion 52 contacts the upper wall portion 26, it is possible to reduce the hitting sound caused by the contact with the upper wall portion 26.

  On the other hand, for example, when the wheel is steered, as shown in FIG. 5, the piston rod 12 is displaced in a twisting direction so as to tilt obliquely about the bearing 18, and the stopper rubber portion 42 is moved upward at one place on the circumference. It approaches the wall 26 and tries to contact it. In this case, according to the present embodiment, the spherical crown-shaped protrusion 52 makes point contact with the upper wall portion 26, so that abnormal noise due to contact can be reduced. In particular, at the time of such twisting displacement, after the contact between the spherical crown projection 52 and the upper wall portion 26, a further twisting force acts on the projection 52 in a lateral direction (that is, radially outward). Thus, since it has a spherical crown shape, it has a follow-up property with respect to such a lateral shift, and is excellent in the noise prevention effect. In addition, the piston rod 12 rotates while being twisted, but the spherical crown-shaped protrusion 52 has a circular cross section and has no directivity, so that it can follow a circumferential shift. Excellent anti-noise effect from the point.

  Further, since the interval C between adjacent projections is set to be equal to or less than the width D of the spherical crown projection, the spherical crown projection 52 has as many projections 52 as possible when contacting the body 14 at the time of twisting displacement. It can be brought into contact with the portion 26 and can share the load accordingly. Further, the angle α formed between the tangent L that contacts the crown-shaped projection 52 and the tip end portion 42c of the stopper rubber portion main body and the lower surface 42b of the stopper rubber portion main body is set to be larger than the maximum twist angle β of the piston rod 12. Therefore, at the time of twisting displacement, the crown-shaped projection 52 can be brought into contact with the body 14 earlier than the stopper rubber portion main body 42a, and an effect of preventing abnormal noise can be exhibited.

As shown in FIG. 5, the spherical crown-shaped protrusion 52 abuts against the curved surface portion 25 that reaches the side wall portion 24 while gently curving outward and downward in the radial direction from the upper wall portion 26 of the recess 22 at the time of twisting displacement. that has provided it is in as. By providing the upper wall portion 26 so as to contact the curved surface portion 25 as described above, the contact with the body 14 at the time of twisting displacement is alleviated, and particularly when a force that shifts laterally after the contact is applied. In addition, the generation of abnormal noise can be suppressed by suppressing the accumulation of the energy. Note that the contact position of the spherical crown-shaped protrusion 52 with the body 14 at the time of twisting displacement varies depending on the load applied to the body 14. Therefore, it is preferable to set so that the curved surface portion 25 abuts at the time of such a small load (for example, a state where no passenger is present).

[Second Embodiment]
Next, the strut mount 10A according to the second embodiment will be described with reference to FIGS. The second embodiment is different from the first embodiment in the configuration of the stopper rubber portion 42. The configuration other than the stopper rubber portion is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 6 to 8, in the present embodiment, on the lower surface 42b of the stopper rubber portion 42, the plurality of spherical crown-shaped projections 52 are arranged at equal intervals over the entire circumference of the lower surface 42b and in an inner and outer double annular shape. It is arranged. The spherical crown-shaped projections 52 are alternately arranged in the circumferential direction by an inner circular annular row 56 and an outer circular annular row 58. In other words, the inner annular row 56 and the outer annular row 58 are not provided at positions where the spherical crown projections 52 are completely overlapped in the radial direction, but adjacent spherical crown projections 52, 52 of the inner annular row 56. They are shifted in the circumferential direction so that the center of the spherical crown-shaped protrusion 52 of the outer annular row 58 is located at an intermediate angular position. In the illustrated example, both the inner annular row 56 and the outer annular row 58 are provided with a total of 48 spherical crown projections 52 every 7.5 ° in the circumferential direction, and the inner annular row 56 and the outer annular row are provided. The deviation in the circumferential direction with respect to 58 is set to 3.75 °.

  As shown in FIG. 9, the spherical crown-shaped projection 52 is a substantially hemispherical projection, and a curved connection surface portion 60 that gently connects the hemispherical spherical surface and the lower surface 42b of the stopper rubber portion is provided at the base portion thereof. It has been. More specifically, the spherical crown protrusion 52 has a spherical crown shape having a height equal to or greater than the radius. In this example, the height B is set to 1.2 mm with respect to the radius R = 1 mm of the spherical crown body. Yes. This height B is preferably 1.0 to 1.5 times the radius R of the spherical crown. In this example, the thickness A of the stopper rubber portion main body 42a is set to 2 mm.

  In the longitudinal cross-sectional shape shown in FIG. 9, the spherical crown-shaped projection 52 has a tangent line L that contacts both the tip end portion 42c of the stopper rubber portion main body 42a and the spherical crown-shaped projection 52 of the outer annular row 58, and the stopper rubber portion main body 42a. The angle α formed with the lower surface 42 b is set to be larger than the maximum twist angle β of the piston rod 12. In this example, the angle α is set to about 35 °.

  The intervals C1 and C2 between the spherical crown-shaped projections 52 adjacent in the circumferential direction are set to be equal to or less than the width D of the spherical crown-shaped projection (see FIG. 8). Specifically, in this example, the width D, that is, the diameter of the spherical crown-shaped projections 52 is 2 mm, and the spacing between the spherical crown-shaped projections 52 is about 1. The distance C2 at the outer annular row 58 of 5 mm is set to about 2 mm, which is equivalent to D. These intervals C1 and C2 are preferably 0.5 to 1 times the width D of the spherical crown protrusion 52.

  As shown in FIG. 10, the spherical crown-like projections 52 are arranged radially outward and downward from the upper wall portion 26 of the recess 22 when the crown-like projections 52 of the outer annular row 58 are twisted and displaced. It is configured to come into contact with the curved surface portion 25 reaching the side wall portion 24 while being gently curved.

  Other configurations are the same as those of the first embodiment, and the same operational effects are achieved. Furthermore, in the second embodiment, the spherical crown-shaped projections 52 are arranged in parallel in the inner and outer double rings so as to be alternately arranged in the circumferential direction in the inner annular row 56 and the outer annular row 58. By reducing the load acting on the spherical crown-like projection 52 by contact with the body 14 at the time of displacement, the noise prevention effect can be further enhanced.

  The present invention can be used as a strut mount mainly used for a strut suspension of a vehicle such as an automobile.

Sectional drawing in the assembly | attachment state of the strut mount concerning 1st Embodiment Exploded view of FIG. Bottom view of rebound stopper Main section enlarged view of rebound stopper (Part IV enlarged view of Fig. 1) Half cross-sectional view of strut mount when piston rod is twisted Sectional drawing in the assembly | attachment state of the strut mount concerning 2nd Embodiment Exploded view of FIG. Bottom view of the rebound stopper of the second embodiment The principal part expanded sectional view of the rebound stopper (the IX part enlarged view of Drawing 6) Half sectional view of the strut mount when the piston rod of the second embodiment is twisted and displaced

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10A ... Strut mount, 12 ... Piston rod, 12a ... Upper end part of piston rod, 14 ... Body, 22 ... Recess, 26 ... Upper wall part, 28 ... Opening part, 30 ... Inner member, 32 ... Outer member, 34 ... Anti-vibration base, 36 ... Rebound stopper, 42 ... Stopper rubber part, 42a ... Stopper rubber part body, 42b ... Bottom surface of the stopper rubber part, 48 ... Stopper plate part, 50 ... Gap, 52 ... Spherical projection, 56 ... Inner annular row, 58 ... outer annular row, A ... thickness of stopper rubber portion body, B ... height of spherical crown-shaped projections, C, C1, C2 ... interval between spherical crown-shaped projections, D ... width of spherical crown-shaped projections , L ... tangent, α ... angle formed between the tangent and the bottom surface of the stopper rubber body, β ... maximum twist angle

Claims (9)

An inner member attached to the piston rod side of the shock absorber, an outer member surrounding the inner member and attached to the body side, and a rubber-like elastic body interposed between the inner member and the outer member to couple the two members together An anti-vibration base consisting of
A recess provided in the body that is opened downward, and is fitted from below into a recess having an opening in the upper wall of the recess, and the outer member is fastened to the body. Not in the strut mount assembled in a state of being sandwiched between the body and the piston rod than the load of the body,
A rebound stopper attached to an upper end portion of the piston rod for limiting a relative displacement of the piston rod in a downward direction; the rebound stopper being a gap upward with respect to an upper wall portion around the opening of the recess; And a stopper rubber portion provided on the lower surface of the stopper plate portion, and a plurality of spherical crown-shaped projections on the lower surface of the stopper rubber portion are equally spaced over the entire circumference in the circumferential direction. Are arranged in parallel, and the interval between the spherical crown-shaped projections adjacent in the circumferential direction is set to be equal to or less than the width of the spherical crown-shaped projection,
When the piston rod is twisted and displaced without an occupant, the spherical crown-shaped protrusion is arranged to contact a curved surface portion that reaches the side wall portion while curving radially outward and downward from the upper wall portion of the recess. Strut mount characterized by that.   The strut mount according to claim 1, wherein the height of the spherical crown-shaped projection is set to be equal to or greater than the thickness of the stopper rubber portion main body.   An angle formed between a tangent line that contacts both the spherical crown-shaped protrusion and the tip of the stopper rubber portion main body and a lower surface of the stopper rubber portion main body is set to be larger than a maximum twist angle of the piston rod. The strut mount according to claim 1. The spherical crown-shaped projections are arranged in parallel in an inner and outer double ring on the lower surface of the stopper rubber portion, and the curved crown portion of the outer annular row is deformed when the piston rod is twisted with no occupant. The strut mount according to claim 1, wherein the strut mount is disposed so as to abut against the strut mount. The strut mount according to claim 4, wherein the spherical crown-shaped projections are alternately arranged in the circumferential direction in an inner annular row and an outer annular row.   The strut mount according to claim 4, wherein the spherical crown-shaped protrusion has a spherical crown shape having a height equal to or greater than a radius. The angle formed by the tangent line that contacts both the spherical crown-shaped projections of the outer annular row and the tip of the stopper rubber part main body and the lower surface of the stopper rubber part main body is set to be larger than the maximum twist angle of the piston rod. The strut mount according to claim 4 . An inner member attached to the piston rod side of the shock absorber, an outer member surrounding the inner member and attached to the body side, and a rubber-like elastic body interposed between the inner member and the outer member to couple the two members together An anti-vibration base consisting of
A recess provided in the body that is opened downward, and is fitted from below into a recess having an opening in the upper wall of the recess, and the outer member is fastened to the body. Not in the strut mount assembled in a state of being sandwiched between the body and the piston rod than the load of the body,
A rebound stopper attached to an upper end portion of the piston rod for limiting a relative displacement of the piston rod in a downward direction; the rebound stopper being a gap upward with respect to an upper wall portion around the opening of the recess; And a stopper rubber portion provided on the lower surface of the stopper plate portion, and a plurality of spherical crown-shaped projections on the lower surface of the stopper rubber portion are equally spaced over the entire circumference in the circumferential direction. Are arranged in parallel, and the interval between the spherical crown-shaped projections adjacent in the circumferential direction is set to be equal to or less than the width of the spherical crown-shaped projection,
The spherical crown-shaped protrusion is arranged so as to come into contact with a curved surface portion that reaches the side wall portion while curving radially outward and downward from the upper wall portion of the recess when the piston rod is twisted and displaced.
Strut mount characterized by that. The spherical crown-shaped projections are arranged in parallel in an inner and outer double ring on the lower surface of the stopper rubber portion, and the spherical crown-shaped projections in the outer annular row are arranged so as to contact the curved surface portion when the piston rod is twisted and displaced. 9. The strut mount according to claim 8, wherein

Images