JP2008128273A - Strut mount and its assembled structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strut mount having reduced cost and weight by simply manufacturing an inner member, and to provide its assembled structure. <P>SOLUTION: The strut mount comprises a rubber elastic body 1 formed in a thick and cylindrical shape, and the inner member 2 formed in a cylindrical shape and arranged on the inner periphery of the rubber elastic body 1. The inner member 2 is axially split in two and consists of a first inner 21 having a tapered cylindrical portion 22 formed with pressing work requiring less pressing frequencies (pressing processes) and fixed to a lower-end inner peripheral face 12 of the rubber elastic body 1, and a second inner 25 simply formed in a straight cylindrical shape by cutting a steel pipe material and pressed and fixed to an upper-end inner peripheral face 13 of the rubber elastic body 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a strut mount used in a vehicle strut suspension device and an assembly structure thereof.

  Conventionally, in a strut suspension device, a strut mount comprising a rubber elastic body as a main element is interposed between an upper end of a strut having a shock absorber and a coil spring and a vehicle body, and transmitted from a road surface through a tire. The vibration from the road surface is transmitted to the body by absorbing the vibration that is absorbed by the shock absorber and coil spring and absorbing the vibration that cannot be absorbed by the shock absorber and coil spring with the strut mount. It prevents or suppresses.

  As such a strut mount, conventionally, for example, as disclosed in Patent Documents 1 to 3, the body is fitted upward from below into a recess formed in a recessed state in the vehicle body. There is known a type of strut mount that can be assembled to the body without being fastened to the body while the outer peripheral surface of the rubber elastic body is pressed against the inner surface of the recess by the load of the body.

  As shown in FIG. 5, this type of strut mount generally includes an inner member 71 and an outer member 72 which are formed in a cylindrical shape by a rigid material and arranged coaxially with a distance in the radial direction, and both of these members. It is comprised from the rubber elastic body 73 which interposes between 71 and 72 and connects both the members 71 and 72 integrally. This type of strut mount is advantageous in that it can be manufactured at a low cost and can be reduced in weight because a fastening member for the body can be omitted.

  As shown in FIG. 4, the strut mount is held at the tip of the piston rod 54 of the shock absorber together with the bearing member 53 and the upper seat 52 mounted and held on the inner peripheral side of the inner member 71 in the front suspension device. The rubber elastic body 73 is fitted so that the outer peripheral surface of the recess 51a provided in the body panel 51 of the vehicle is pressed against the inner surface of the recess 51a. The rebound stopper member 56 arranged in such a manner is fixed to the body panel 51 by being fixed by a nut 57 screwed to the tip of the piston rod 54.

  By the way, the inner member 71 and the outer member 72 in the above-described strut mount are usually formed into a cylindrical shape that tapers toward the upper end by pressing a flat metal plate and rolling it in the plate thickness direction. Is formed. In this case, if the press stroke is increased at the time of press working, the amount of rolling deformation in the pressing direction of the metal plate increases and the wall thickness becomes thin. Therefore, the press stroke cannot be increased too much. . Therefore, the longer the axial length is in the final shape after the press working, the more pressing times (the number of pressing steps) are required.

In particular, the inner member 71 has a complicated structure having a plurality of curved tapered portions to which the bearing member 53 and the upper sheet 52 are attached and held on the inner peripheral side thereof, and has an axial length as compared with the outer member 72. Is formed in a long cylindrical shape, so that the number of times of pressing (the number of pressing steps) is much larger than that of the outer member 72. For this reason, the production of the inner member 71 by press working is one cause of an increase in cost.
No. 2-12081 JP 2004-232824 A JP 2006-2996 A

  The present invention has been made in view of the above circumstances, and it is possible to realize a reduction in cost by making it possible to easily produce an inner member, and to further reduce the weight. And providing the assembly structure thereof is a problem to be solved.

  A strut mount according to the present invention for solving the above-mentioned problems is a rubber elastic body formed in a thick-walled cylindrical shape, and is formed in a cylindrical shape thinner than the rubber elastic body by a rigid material. The inner member is disposed on the vehicle body, and is fitted upward from below into a recess formed in a state of being recessed upward in the vehicle body, and without being fastened to the body, The strut mount is assembled to the body in a state where the outer peripheral surface of the rubber elastic body is pressed against the inner surface of the recess by a load, and the inner member is divided into two in the axial direction, A first inner portion having a tapered cylindrical portion that is formed in a curved taper shape that gradually decreases in diameter from the lower end side in the direction toward the upper end side, and is fixed to the inner periphery on the lower end side in the axial direction of the rubber elastic body; It is characterized by being composed of a second inner press-fitted within the axial upper side periphery of the rubber elastic body is formed into a cylindrical shape.

  In the strut mount of the present invention, the inner member is composed of a first inner and a second inner that are divided into two in the axial direction. The first inner is formed into a curved tapered shape that gradually decreases in diameter from the lower end side in the axial direction toward the upper end side by pressing a flat metal plate and rolling it in the plate thickness direction. It has a cylindrical part. This tapered cylindrical portion is a portion that is fixed to the inner periphery of the rubber elastic body at the lower end in the axial direction, and is usually formed to have a length of about 1/2 to 2/3 of the axial length of the rubber elastic body. Therefore, the axial length can be reduced to about ½ as compared with the conventional inner member. In addition, the tapered cylindrical portion that is formed in a curved taper shape that gradually decreases in diameter from the lower end side in the axial direction toward the upper end side has a relatively simple shape in the entire axial direction, thereby avoiding the complexity of the structure. Has been. For this reason, when the first inner is manufactured by press working, the number of presses (the number of pressing steps) can be reduced, so that the first inner can be easily manufactured and the cost can be reduced.

  On the other hand, since the second inner is formed in a straight cylindrical shape by a rigid material, for example, a steel pipe material cut into a predetermined length or a resin pipe material can be used as it is. . Therefore, it can be easily manufactured without requiring press work, so that cost reduction can be realized. In addition, since this 2nd inner is press-fitted and fixed to the axial direction upper end side inner periphery of a rubber elastic body, since a precompression is applied to a rubber elastic body and a rubber elastic body is restrained in an axis perpendicular direction, rubber It is possible to ensure sufficient durability and necessary characteristics of the elastic body.

  In addition, since the inner member is divided into two in the axial direction, the strut mount of the present invention can be made smaller in the axial direction than the conventional one. Furthermore, the strut mount of the present invention is composed of a rubber elastic body and an inner member made of a first inner and a second inner, and the metal outer member employed in the conventional strut mount is omitted. Therefore, it is possible to reduce the weight.

  As a preferred embodiment of the strut mount of the present invention, the first inner is a ring-shaped flange that extends radially outward from the lower end of the tapered cylindrical portion and is disposed opposite to the lower end surface of the rubber elastic body in the axial direction. It can comprise so that it may have a part. In this way, since the flange portion functions as a stopper that restricts excessive axial displacement of the rubber elastic body, the durability of the rubber elastic body can be improved.

  Further, as another preferable aspect of the strut mount of the present invention, a second inner member that protrudes radially inward from the axial upper end portion of the inner peripheral surface of the rubber elastic body and is press-fitted into the inner periphery of the rubber elastic body. It is possible to provide a protruding portion that prevents slipping out. In this way, when the rubber elastic body is elastically deformed by vibration input, it is possible to reliably prevent the second inner from coming out of the rubber elastic body.

  As still another preferred embodiment of the strut mount of the present invention, a relief recess for absorbing the elastic displacement of the rubber elastic body when the second inner is press-fitted is provided in the inner peripheral portion of the rubber elastic body. Can do. In this way, the second inner can be smoothly press-fitted into the inner periphery of the rubber elastic body. The relief recess may be provided in the axially intermediate portion of the inner peripheral surface of the rubber elastic body, or may be provided in a step portion formed in the axially intermediate portion of the inner peripheral surface of the rubber elastic body. Good.

  The strut mount assembly structure according to the present invention for solving the above-mentioned problems is that the strut mount is held at the tip of the piston rod of the shock absorber together with the bearing member mounted on the inner peripheral side of the first inner. In this state, the outer peripheral surface of the rubber elastic body is fitted so as to be pressed against the inner surface of the recess provided in the body of the vehicle, and then disposed so as to face the back surface of the recess. The rebound stopper member is assembled to the body by being fixed with a nut screwed to the tip of the piston rod.

  According to the strut mount of the present invention, the inner elastic member is divided into two parts in the axial direction, and is formed into a curved taper shape having a gradually decreasing diameter from the lower end side in the axial direction toward the upper end side, and the rubber elastic body A first inner portion having a tapered cylindrical portion fixed to the inner periphery on the lower end side in the axial direction, a second inner portion formed in a straight cylindrical shape and press-fitted to the inner periphery on the upper end side in the axial direction of the rubber elastic body, Therefore, the inner member can be easily manufactured, and the cost can be reduced. In addition, the strut mount of the present invention is composed of a rubber elastic body and an inner member composed of a first inner and a second inner, and the metal outer member employed in the conventional strut mount is omitted. Therefore, weight reduction can be achieved.

  The strut mount assembly structure of the present invention includes an inner member divided into two parts in the axial direction, and can be reduced in size and weight in the axial direction as compared with the conventional structure. Since the strut mount is assembled, it can be efficiently and advantageously assembled in a space with respect to the vehicle body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view along the axial direction of the strut mount according to the present embodiment, FIG. 2 is a cross-sectional view along the axial direction when the rubber elastic body of the strut mount is vulcanized, and FIG. It is sectional drawing which follows the axial direction which shows the assembly | attachment state of a strut mount.

  As shown in FIG. 1, the strut mount of this embodiment is formed of a rubber elastic body 1 formed in a thick-walled cylinder and a cylindrical cylinder that is thinner than the rubber elastic body 1 by a rigid material, and is two in the axial direction. The inner member 2 is composed of a first inner 21 and a second inner 25 that are divided into two and disposed on the inner periphery of the rubber elastic body 1.

  The rubber elastic body 1 is formed by integrally vulcanizing and molding a predetermined rubber material together with the first inner 21 (see FIG. 2), and the outer peripheral side at both axial ends is positioned higher in the axial direction than the inner peripheral side. It is formed in a thick-walled cylindrical shape that is slanted. The outer peripheral surface 11 of the rubber elastic body 1 gradually corresponds to the shape of the inner surface of the recess 51a (see FIG. 3) provided in the vehicle body so that the strut mount can be assembled. It is formed in a tapered shape with a small diameter.

  On the other hand, the lower end side inner peripheral surface 12 formed to have a substantially half length in the axial direction of the rubber elastic body 1 is vulcanized and bonded to the outer peripheral surface of the tapered cylindrical portion 22 of the first inner 21. Corresponding to the shape, it is formed in a curved taper shape that gradually decreases in diameter from the lower end side in the axial direction toward the upper end side. Moreover, the upper end side inner peripheral surface 13 formed to have a substantially half length in the axial direction of the rubber elastic body 1 is formed in a straight shape having a constant diameter. The diameter of the upper end side inner peripheral surface 13 is set to be substantially the same as the diameter of the lower end side inner peripheral surface 12 on the axial upper end side. At the upper end in the axial direction of the inner peripheral surface 13 on the upper end side, a protruding portion 14 that protrudes radially inward and is formed in a ring shape is provided integrally with the rubber elastic body 1. The second inner 25 press-fitted into the upper end side inner peripheral surface 13 is prevented from coming out.

  Further, a ring-shaped step portion 15 extending radially inward is provided at a portion (a substantially central portion in the axial direction) between the upper end side inner peripheral surface 13 and the lower end side inner peripheral surface 12 of the rubber elastic body 1. Is provided. At the corner where the upper surface of the step portion 15 and the inner peripheral surface 13 on the upper end side intersect, a relief recess 16 formed so as to be gradually inclined downward in the axial direction as it goes radially outward is provided in the step portion 15. It is provided along the outer peripheral edge of the upper surface. The relief recess 16 absorbs the elastic displacement of the rubber elastic body 1 when the second inner 25 is press-fitted into the inner peripheral surface 13 on the upper end side, so that the second inner 25 can be press-fitted smoothly. It is provided for.

  The first inner 21 of the inner member 2 is formed by pressing a flat steel plate, and is formed in a curved taper shape that gradually decreases in diameter from the lower end side in the axial direction toward the upper end side. It comprises a tapered cylindrical portion 22 and a ring-shaped flange portion 23 that extends radially outward from the lower end of the tapered cylindrical portion 22. The upper end portion of the tapered cylindrical portion 22 formed in a curved taper shape extends in the centripetal direction so as to be substantially perpendicular to the axis. When the rubber elastic body 1 is vulcanized and molded, the outer surface of the tapered cylindrical portion 22 is vulcanized and bonded to the lower end side inner peripheral surface 12 of the rubber elastic body 1 and the lower surface of the step portion 15. It is assembled to.

  Thereby, the flange part 23 is arrange | positioned so that it may oppose in the state which overlapped with the lower end surface of the rubber elastic body 1 at a distance in the axial direction, and when the vibration of an axial direction input, rubber elasticity It functions as a stopper that regulates excessive displacement of the body 1 in the axial direction. The surface of the flange portion 23 and the inner peripheral surface of the tapered cylindrical portion 22 are covered with a rubber coating layer 17 formed integrally with the rubber elastic body 1 when the rubber elastic body 1 is vulcanized. Further, a seal lip 18 for sealing the bearing member 53 disposed on the inner peripheral side of the tapered cylindrical portion 22 is provided on the rubber coating layer 17 covering the inner peripheral surface of the inner peripheral surface of the tapered cylindrical portion 22. Is provided.

  On the other hand, the second inner 25 is formed by cutting a steel pipe material having a predetermined diameter and substantially the same thickness as the first inner 21 into a predetermined length, and is formed in a straight cylindrical shape. . The second inner 25 has an outer diameter that is the same as or slightly larger than the diameter of the upper end side inner peripheral surface 13 of the rubber elastic body 1, and is press-fitted and fixed to the upper end side inner peripheral surface 13.

  The strut mount of the present embodiment configured as described above, as shown in FIG. 3, is fitted into the recess 51 a formed in a state of being recessed upward in the vehicle body panel 51 from below and assembled. . In this case, first, the upper seat 52 disposed below the strut mount, the bearing member 53 mounted on the inner peripheral side of the first inner 21 of the strut mount, and the strut mount are sequentially arranged in the center hole thereof. Is held at the tip of the piston rod 54 of the shock absorber inserted into the shock absorber. In this state, the strut mount is fitted so that the outer peripheral surface 11 of the rubber elastic body 1 is pressed against the inner surface of the recess 51a of the body panel 51.

  Next, a spacer 55 that is attached to the bearing member 53 so as to overlap with the inner peripheral position of the upper end portion of the first inner 21 is fitted into the tip portion of the piston rod 54, and is then disposed opposite the back surface of the recess 51a. The central hole of the rebound stopper member 56 is fitted into the tip of the piston rod 54 so that the central portion of the rebound stopper member 56 overlaps the spacer 55. Thereafter, the strut mount is assembled to the recess 51a provided in the body panel 51 by screwing the nut 57 into the male screw provided at the tip of the piston rod 54 and tightening the rebound stopper member 56. It is done.

  In order to enable steering of the wheel, the bearing member 53 disposed between the first inner 21 of the inner member 2 and the upper seat 52 has a stepped portion of the rubber elastic body 1 on the upper end side in the axial direction. 15 and the rebound stopper member 56 are sealed by being in pressure contact with each other, and at the lower end in the axial direction, the seal lip 18 of the rubber coating layer 17 is sealed by being in pressure contact with the bearing member 53.

  Since the inner member 2 is divided into two parts in the axial direction, the strut mount of this embodiment assembled as described above can be made smaller in the axial direction than the conventional one. In addition, since the spacer 55 has a structure in which a thin axial thickness can be used, the spacer 55 is efficiently and advantageously assembled in a space with respect to the vehicle body.

  As described above, in the strut mount of the present embodiment, the inner member 2 is divided and formed in two in the axial direction, and the first inner 21 formed by pressing that requires a smaller number of presses (the number of press steps); Since it is comprised from the straight cylindrical 2nd inner 25 formed easily by cut | disconnecting a steel pipe material, the inner member 2 can be produced easily and cost reduction can be implement | achieved. . The first inner 21 is fixed to the lower end side inner peripheral surface 12 of the rubber elastic body 1, and the second inner 25 is configured to be press-fitted and fixed to the upper end side inner peripheral surface 13 of the rubber elastic body 1. Thus, sufficient durability and necessary characteristics of the rubber elastic body 1 can be ensured.

  Further, the strut mount of the present embodiment is constituted by the rubber elastic body 1 and the inner member 2 including the first inner 21 and the second inner 25, and is made of a metal outer that has been adopted in the conventional strut mount. Since the member is omitted, the weight can be reduced.

  The strut mount assembly structure of the present embodiment includes an inner member 2 that is divided into two parts in the axial direction, and can be smaller and lighter in the axial direction than the conventional one. Since the above-described strut mount is assembled, it can be assembled efficiently and advantageously in space with respect to the vehicle body.

It is sectional drawing which follows the axial direction of the strut mount which concerns on embodiment of this invention. It is sectional drawing in alignment with the axial direction when the rubber elastic body of the strut mount which concerns on embodiment of this invention is vulcanized-molded. It is sectional drawing which follows the axial direction which shows the assembly | attachment state of the strut mount which concerns on embodiment of this invention. It is sectional drawing which follows the axial direction which shows the assembly | attachment state of the conventional strut mount. It is sectional drawing which follows the axial direction of the conventional strut mount.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rubber elastic body 11 ... Outer peripheral surface 12 ... Lower end side inner peripheral surface 13 ... Upper end side inner peripheral surface 14 ... Projection part 15 ... Step part 16 ... Relief recessed part 17 ... Rubber coating layer 18 ... Seal lip 2 ... Inner member 21 ... 1st inner 22 ... Tapered cylindrical part 23 ... Flange part 25 ... 2nd inner 51 ... Body panel 51a ... Recess 52 ... Upper sheet 53 ... Bearing member 54 ... Piston rod 55 ... Spacer 56 ... Rebound stopper member 57 ... Nut

Claims (5)

A rubber elastic body formed in a thick cylindrical shape and an inner member formed in a cylindrical shape thinner than the rubber elastic body by a rigid material and disposed on the inner periphery of the rubber elastic body. The rubber elastic body is inserted into the recess formed in the recessed state in the upward direction from below, and is fastened to the body without being fastened to the body by the load of the body on the inner surface of the recess. A strut mount that is assembled to the body with the outer peripheral surface being pressed,
The inner member is divided into two parts in the axial direction, is formed in a curved taper shape that gradually becomes smaller in diameter from the lower end side in the axial direction toward the upper end side, and is formed on the inner periphery of the lower end side in the axial direction of the rubber elastic body. A first inner part having a fixed tapered cylindrical part and a second inner part formed in a straight cylindrical shape and press-fitted and fixed to the inner periphery of the rubber elastic body in the axial direction upper end side. And strut mount.   The said 1st inner has a ring-shaped flange part extended in radial direction outward from the lower end of the said taper-shaped cylindrical part, and opposingly arrange | positioning in the axial direction with the lower end surface of the said rubber elastic body. Strut mount.   At the upper end in the axial direction of the inner peripheral surface of the rubber elastic body, there is provided a protrusion that protrudes radially inward and prevents the second inner member press-fitted into the inner periphery of the rubber elastic body from slipping out. The strut mount according to claim 1 or 2.   The strut according to any one of claims 1 to 3, wherein an escape recess that absorbs an elastic displacement of the rubber elastic body when the second inner is press-fitted is provided in an inner peripheral portion of the rubber elastic body. mount.   The strut mount according to any one of claims 1 to 4 is provided on a vehicle body in a state of being held at a tip of a piston rod of a shock absorber together with a bearing member mounted on an inner peripheral side of the first inner. After the outer peripheral surface of the rubber elastic body is pressed against the inner surface of the recess, a rebound stopper member disposed so as to face the back surface of the recess is at the tip of the piston rod. A strut mount assembly structure characterized by being assembled to the body by being fixed by a screwed nut.

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