JP2006046588A - Stopper member for vibration-proofing bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stopper member for a vibration-proofing bush capable of inhibiting the generation of noise by stick slip on a contact face with a mounting bracket or the like. <P>SOLUTION: This stopper member 27 of the bush 10 is inserted and fitted to an axial right end part side of an inner cylinder fitting 12 and held between the mounting bracket 35 fixed to an axial end part and an end part of an outer cylinder fitting 14 in a compressed state. The contact face with the mounting bracket, of the stopper member 27 is provided with circular arc-shaped linear projections 31 concentrically mounted on several parts in the radial direction and on several parts in the circumferential direction, and groove parts 32 are formed on several parts separated from each other in the circumferential direction in a state of being extended from a center hole in the radial direction to an outer peripheral edge. The embossing work is performed on the contact face 29 provided with the linear projections 31 and the groove parts 32, to form a fine irregular state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anti-vibration bushing stopper member attached to an axial end portion of an anti-vibration bush attached to an arm member or the like in a vehicle suspension.

  Conventionally, as this type of anti-vibration bushing, for example, as shown in Patent Document 1, a cylindrical rubber elasticity is provided between a shaft member attached to a vehicle side bracket and an outer cylinder member disposed around the shaft member. A rubber elastic stopper ring is fitted to the axial end of the shaft member, and the stopper ring is sandwiched between the outer cylinder member end and the vehicle side bracket in a compressed state. Things are known. This anti-vibration bush is fixed to the vehicle body side by a vehicle side bracket, and is fixed to the suspension side by an arm member in which a connecting cylinder is press-fitted and fixed to the outer cylinder member. The anti-vibration bush is displaced by an external force (vibration input) from the axial direction, the direction perpendicular to the axis, and the rotational direction around the axis while the vehicle is running. Therefore, when the stopper ring receives an external force and moves, abrupt friction occurs with the vehicle-side bracket that is in pressure contact. As a result, there is a problem that abnormal noise due to a stick slip is likely to occur.

On the other hand, in Patent Document 1, the stopper ring is formed of a single rubber and a lubricant is blended with the raw rubber to form a surface lubrication member, or a coating layer made of a material having a low friction coefficient on the surface of the stopper ring. The surface lubrication member is formed to reduce the frictional resistance between the stopper ring and the vehicle side bracket, thereby suppressing the generation of abnormal noise due to the stick lip. However, the stopper ring is sandwiched between the end of the outer cylinder member and the vehicle side bracket in a compressed state so as to come into contact with the bracket over a wide area, and the contact resistance between the two is increased. For this reason, simply making the stopper ring and the vehicle side bracket easy to slide by the above-mentioned material countermeasures does not sufficiently suppress the generation of abnormal noise.
JP-A-11-51099

  The present invention is intended to solve the above-described problem, and an object of the present invention is to provide a vibration-proof bushing stopper member that can suppress the occurrence of abnormal noise due to sticky slips on the contact surface with a mounting bracket or the like. .

  In order to achieve the above object, the structural features of the present invention include an inner cylinder fitting, an outer cylinder fitting that is disposed radially outwardly surrounding the inner cylinder fitting, and an interval between the inner cylinder fitting and the outer cylinder fitting. An annular stopper member made of a rubber elastic body, which is inserted into the axial end portion of the inner cylindrical fitting of the vibration isolating bushing having a rubber elastic body main body to be connected, in the axial direction. In the vibration-proof bushing stopper member that is sandwiched in a compressed state between the plate-shaped mounting bracket fixed to the end and the end of the outer tube fitting, multiple locations spaced in the circumferential direction of the contact surface that contacts the mounting bracket Provided with a groove extending between the central hole and the outer peripheral edge and recessed from the contact surface, and a plurality of arc-shaped linear protrusions protruding from the contact surface between adjacent groove portions in the circumferential direction. That is.

  In the invention configured as described above, by providing a groove portion that extends between the central hole and the outer peripheral edge and is recessed from the contact surface at a plurality of locations in the circumferential direction of the contact surface of the stopper member that contacts the mounting bracket. Since the contact surface side is divided into a plurality of areas, the spring constant on the contact surface side is softened, and the rubber elastic body surface side is deformed against mutual displacement between the stopper member and the mounting bracket due to external vibration input It becomes easy to follow. Furthermore, the contact area between the contact surface and the plate-shaped mounting bracket is provided on the contact surface of the stopper member by providing an arc-shaped linear protrusion protruding from the contact surface between adjacent grooves. And contact resistance against vibration input is reduced. That is, due to the action of the linear protrusions and the grooves provided on these contact surfaces, the contact surfaces are easily deformed and follow the vibration input from the outside, and the contact resistance with the mounting bracket against the vibration input is increased. It is made smaller. Therefore, it is difficult for slippage to occur between the stopper member and the mounting bracket with respect to normal vibration input from the outside. Furthermore, for a large external vibration input, a sudden slip such as a stick lip is mitigated between the contact surface of the stopper member and the mounting bracket by a synergistic action that combines the action of the linear protrusion and the groove. And smooth sliding. As a result, in the present invention, the generation of abnormal noise due to stick-slip can be effectively suppressed against external vibration input.

  Further, the linear protrusions of the stopper member may be further spaced apart from each other at a plurality of radial positions. As a result, the contact area with the plate-like mounting bracket is reduced over the entire abutting surface, so that the contact resistance is further reduced, and therefore the effect of suppressing the generation of abnormal noise due to the stick slip is further enhanced.

  The stopper member may be formed of a self-lubricating rubber material having a low friction coefficient. As a result, the frictional resistance between the contact surface and the mounting bracket is reduced, and the contact resistance between the two is reduced, so that the effect of suppressing the generation of abnormal noise due to the stick slip is further enhanced.

  In addition, the contact surface of the stopper member may be subjected to a graining process having a minute uneven shape. As a result, the contact area between the contact surface and the mounting bracket is reduced, so that the contact resistance between the two is reduced, and the effect of suppressing abnormal noise is further enhanced.

  According to the present invention, the contact surface is provided by providing grooves extending between the center hole and the outer peripheral edge and recessed from the contact surface at a plurality of locations in the circumferential direction of the contact surface of the stopper member that contacts the mounting bracket. The spring constant on the side is soft, the rubber elastic body surface side is easily deformed to follow external vibration input, and a plurality of protrusions projecting from the contact surface between adjacent groove portions of the contact surface By providing the arc-shaped linear protrusion, the contact area between the contact surface and the mounting bracket is reduced, and the contact resistance between the two with respect to the vibration input is reduced. As a result, in the present invention, due to the synergistic action of the combined action of the linear protrusions and the groove portions, the mutual displacement between the stopper member and the mounting bracket due to vibration input is abruptly similar to a stick lip between the two. The smooth slip is alleviated and the generation of noise due to stick slip is suppressed, and the ride comfort of the vehicle is enhanced. Furthermore, linear protrusions are arranged at multiple locations in the radial direction, the stopper member is formed of a self-lubricating rubber material with a low coefficient of friction, or the contact surface is subjected to a concavo-convex shape with minute irregularities. Thereby, the noise suppression effect is further enhanced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a to-collect bush 10 (hereinafter referred to as a bush) equipped with a stopper member which is an anti-vibration bush assembled between left and right arm members extending from an intermediate beam of a vehicle suspension according to an embodiment and a mounting bracket on a vehicle body side. The main part in the assembled state is indicated by a plan sectional view. 2 to 4 show the bush body 11 in a plan sectional view and left and right side views, and FIG. 5 shows the stopper member 27 in a right side view, a sectional view, and a left side view. FIG. 6 is a plan view showing an assembled state of the bush to the vehicle.

  The bush 10 is a straight cylindrical and thick inner cylinder fitting 12, an outer cylinder fitting 14 that is disposed radially outwardly surrounding the inner cylinder fitting 12, and a rubber that connects the inner and outer cylinder fittings 12 and 14. A bushing body 11 having an elastic body 21, a plate-like mounting bracket 35 that is fitted to the vehicle body side member 6 that is inserted into and fixed to the axial end of the inner cylinder 12 And a stopper member 27, which is an annular plate made of a rubber elastic body, sandwiched in a compressed state between the end portions of the outer cylinder fitting 14. In the following description, the front / rear, left / right, and top / bottom relations of the respective parts of the bush 10 are positional relations when mounted on the vehicle, and correspond to the top / bottom, left / right, and front / back of the paper surface shown in FIG. .

  The outer cylinder fitting 14 is a thin cylindrical fitting, and is integrally provided with an annular outer flange portion 15 extending radially outward at the left end in the axial direction of the cylindrical portion. The outer cylinder 14 is integrally formed with an outer flange portion 15 by drawing the left end of a thin metal pipe. As shown in FIG. 4, the outer flange portion 15 is a substantially rectangular shape that is long in the front-rear direction and short in the up-down direction (the left-right direction in the figure), and has an inclined portion 15a with both corners cut obliquely on the front side. On the side, both corners are dents 15b cut out in a substantially inclined shape. Further, a portion extending from the outer peripheral edge of the outer cylindrical metal member 14 in the front-rear direction is a substantially rectangular shape, and is a recessed portion 15c that is slightly recessed toward the left end in the axial direction. The outer cylinder fitting 14 has an axial length shorter than the axial length of the inner cylinder fitting 12 and is disposed at a position closer to the right end side in the axial direction of the inner cylinder fitting 12. Therefore, a predetermined large left space is formed between the axial direction between the outer flange portion 15 and the left end of the inner cylinder fitting 12, and a gap between the axial direction between the axial right end of the outer cylinder fitting 14 and the right end of the inner cylinder fitting 12 is left. The right space is smaller than the space.

  The rubber elastic body 21 is formed by vulcanization molding between the inner cylinder fitting 12 and the outer cylinder fitting 14 and elastically connects the inner and outer cylinder fittings 12, 14. Further, in the left space on the left side in the axial direction of the flange portion 15 of the outer cylinder fitting 14, an annular shape which is bonded to the outer peripheral surface of the inner cylinder fitting 12 and the left side surface of the outer flange portion 15 and reaches the substantially left end in the axial direction of the inner cylinder fitting 12. The stopper rubber portion 22 is integrally formed extending from the rubber elastic body 21. As shown in FIG. 2, the stopper rubber portion 22 is disposed on the left end with a thick portion 22a in the axial direction and a space portion 22b in the axial direction with the thick portion 22a and is thick at the front and rear ends. It is comprised by the thin part 22c connected with the part 22a. A reinforcing plate 17, which is an annular plate having substantially the same shape as the outer flange portion 15, is embedded coaxially at an axially intermediate position of the thick portion 22 a, and the hardness of the rubber stopper portion 22 is increased. . Further, as shown in FIG. 3, the outer shape of the stopper rubber portion 22 is substantially the same shape as the outer flange portion 15 with the center interposed therebetween, and the lateral width is narrowed in the vicinity of the center in an inclined manner. The rear side is a substantially rectangular shape that is slightly narrower than the outer flange portion 15.

  As shown in FIG. 4, the rubber elastic body 21 and the stopper rubber portion 22 include a left end of the thick portion 22 a of the stopper rubber portion 22 along the axial direction from the front and rear and vertical positions on the right end side of the rubber elastic body 21. A pair of front and rear straight portions 24 and a vertical straight portion 25 sandwiching the respective axial centers, which are space portions extending to the vicinity, are provided. Each of the pair of front and rear curb portions 24 and the upper and lower curb portions 25 has a symmetrical shape with respect to the axis. The front / rear curling portion 24 has a substantially U shape extending from the outer peripheral edge in the radial direction to the inner peripheral edge, and the spring constant in the front / rear direction of the rubber elastic body 21 is reduced. Further, the vertical picking portion 25 is an oval long in the front-rear direction, and the spring constant in the vertical direction of the rubber elastic body 21 is reduced.

  As shown in FIGS. 5-1 to 3, the stopper member 27 is a circular thick plate, and is formed of a so-called self-lubricating rubber, which is a rubber material containing an unsaturated fatty acid amide in rubber and having a low friction coefficient. The stopper member 27 is provided with a central hole 27a having an inner diameter substantially the same as the outer diameter of the inner cylindrical metal member 12 at the center, and the central hole 27a is slightly directed toward the shaft center at a plurality of circumferentially spaced intervals. A protruding protrusion 27b is provided, and a recess 28a slightly recessed in the axial direction is provided around the center hole 27a on the one surface 28 (left surface in the drawing) side. The protrusion 27b is used to make it difficult for the stopper member 27 to be removed from the inner cylinder fitting 12 when the stopper member 27 is inserted into the inner cylinder fitting 12, and the recess 28a is rubber elastic when the stopper member 27 is inserted into the inner cylinder fitting 12. It is provided to avoid contact with the end of the body body 21.

  On the contact surface 29 with the mounting bracket 35, which is the other surface (the right surface in the figure) of the stopper member 27, arc-shaped linear protrusions 31 are concentrically arranged at three locations at substantially equal intervals in the radial direction. It is provided at eight locations in the direction. The contact surface 29 is provided with linear groove portions 32 extending in the radial direction from the center hole 27a to the outer peripheral edge at eight locations separated by 45 ° in the circumferential direction. Each linear protrusion 31 has a shape separated by the groove 32, and its central angle is approximately 45 °. In this embodiment, the linear protrusion 31 has a height and a width of 1 mm. Moreover, although the depth of the groove part 32 is about 11% of the thickness of the stopper member 27, it is desirable to be in the range of 10 to 15%. If it is less than 10%, the deformation of the rubber material may be hindered by an external force applied to the stopper member 27. If it is more than 15%, the spring constant in the axial direction of the stopper member 27 may be too low. is there. Furthermore, minute irregularities 33 are formed on the contact surface 29 on which the linear protrusions 31 and the groove portions 32 are formed by a surface treatment called squeezing. In addition, about the arrangement | positioning to the contact surface 29 of the linear protrusion 31 and the groove part 32, it is possible to arrange | position arbitrarily not only in an Example.

  The assembly of the bush 10 formed as described above to the vehicle will be described with reference to FIGS. A pair of bush bodies 11 are respectively arranged on the left and right sides of the suspension mechanism that supports both wheels 1 of the vehicle with the left ends (ends on the stopper rubber part side) inside, and the suspension mechanism is attached to the outer cylinder fitting 14 of the bush body 11. By fixing the annular arm eye 4 at the tip of the arm member 3 projecting from both ends of the intermediate beam 2, the intermediate beam 2 is fixed to the intermediate beam 2 side. The outer end fitting 14 and the outer end of the arm eye 4 are aligned to be flush with each other. Thereafter, the stopper member 27 is inserted into the inner cylinder fitting 12 in the right space on the right end side of the bush main body 11 with the contact surface 29 facing outside. As a result, the one surface 28 of the stopper member 27 comes into contact with the arm eye 4 and the outer end surface of the outer cylinder fitting 14. In this embodiment, the outer cylinder fitting 14 and the arm member 4 are overlapped and integrated to function as the outer cylinder fitting, but both the outer cylinder fitting 14 and the arm member 4 are integrally formed, It is also possible to use a single outer cylinder fitting that is press-fitted into the rubber elastic body 21.

  Next, the U-shaped mounting bracket 35 is fixed to both end surfaces in the axial direction of the inner cylinder fitting 12. The mounting bracket 35 is integrally formed by a pair of rectangular opposing plates 36 that face each other at the same interval as the axial length of the inner cylindrical metal member 12 and a connecting plate 37 that connects the side edges thereof. A mounting hole 36 a having the same inner diameter as the shaft hole 12 a of the inner cylinder 12 is provided at the center position of the plate 36. The mounting bracket 35 sandwiches both end surfaces of the inner cylinder fitting 12 with a pair of opposing plates 36, is arranged with the mounting holes 36a provided in the opposing plate 36 aligned with the shaft holes 12a of the inner cylinder fitting 12, and the bolts 38 are attached to the attachment holes. The nut 39 is inserted into the shaft hole 12a and tightened by screwing the nut 39 to the tip screw portion, thereby being fixed to the inner cylinder fitting 12. At this time, the stopper member 27 receives a pressing force from the mounting bracket 35 and is sandwiched between the arm eye 4 and the end surface of the outer cylinder fitting 14 to be in a compressed state. In this state, the mounting bracket 35 is fixed to the vehicle body side member 6 by welding, whereby the bush 10 including the pair of left and right stopper members 27 is assembled between the suspension side and the vehicle body side as shown in FIG.

  In the embodiment configured as described above, the contact hole 29 of the stopper member 27 that is in contact with the mounting bracket 35 is extended at a plurality of locations in the circumferential direction by connecting the center hole 27a and the outer peripheral edge in the radial direction. By providing the groove 32 that is recessed from the contact surface 29, the contact surface 29 side is divided into a plurality of regions. Therefore, the spring constant on the contact surface 29 side is softened, and the surface of the rubber elastic body is easily deformed to follow the mutual displacement between the stopper member 27 and the mounting bracket 35 due to vibration input from the wheel 1 side. . Further, by providing the contact surface 29 of the stopper member 27 with arcuate linear protrusions 31 protruding from the contact surface 29 between the adjacent grooves 32, the contact surface 29 and the mounting bracket 35 are provided. And the contact resistance between the two with respect to vibration input is reduced.

As described above, the combined action of the linear protrusion 31 and the groove 32 provided on the contact surface 29 makes it easier for the contact surface 29 to be deformed with respect to vibration input from the wheel 1 side. In contrast, the contact resistance with the mounting bracket 35 is reduced. Therefore, it is difficult for slippage to occur between the stopper member 27 and the mounting bracket 35 with respect to normal vibration input from the wheel 1 side. Further, for a large vibration input from the wheel 1 side due to a collision with an obstacle or the like, mutual action between the stopper member 27 and the mounting bracket 35 is caused by a synergistic action combining the actions of the linear protrusion 31 and the groove 32. With respect to the displacement, a sudden slip such as a stick slip is eased between the two, resulting in a smooth slip. As a result, in this embodiment, the generation of abnormal noise due to stick-slip can be effectively suppressed with respect to a large vibration input.

  Moreover, since the contact area with the mounting bracket 35 is reduced because the contact surface 29 has been subjected to the boring process, the contact resistance between the two is reduced, and the stopper member 27 has a frictional resistance. By being formed of a small self-lubricating rubber, the frictional resistance between the contact surface 29 and the mounting bracket 35 is reduced, and the contact resistance between them is further reduced. Therefore, the effect of suppressing the abnormal noise is further enhanced. As a result, in this embodiment, the propagation of abnormal noise into the passenger compartment is suppressed, and the riding comfort of the vehicle is enhanced.

  In the above embodiment, the linear protrusion 31 and the groove 32 are provided only on the contact surface 29 of the stopper member 27 with the mounting bracket, and the crimping process is performed. 14 and one surface 28 that abuts the arm eye 4 can be provided in the same manner. Thereby, generation | occurrence | production of the noise in the one surface side 28 of the stopper member 27 can also be suppressed. However, the graining can be omitted as necessary, and the rubber material can also be a normal rubber material instead of the self-lubricating rubber. Moreover, in the said Example, only the outer end side of the groove part 32 of the stopper member 27 can be filled and made flat. Thereby, the entry of dust or the like into the groove can be prevented, and the reliability of the stopper member over a long period can be ensured.

  In the above embodiment, the stopper member is provided only at one end in the axial direction of the bush. However, the present invention can be similarly applied to a structure in which the stopper member is provided at both ends of the bush. Moreover, although the said Example demonstrated the example which applied the stopper member to the toe collect bush, not only this but the present invention is similarly applied also to the stopper member applied to the vibration isolating bush which receives the same vibration. Can be applied to. In addition, the bush and the stopper member shown in the above embodiment are merely examples, and various modifications can be made without departing from the spirit of the present invention.

  In the present invention, on the contact surface of the stopper member with the mounting bracket, a groove extending between the center hole and the outer peripheral edge at a plurality of locations in the circumferential direction and recessed from the contact surface, and protruding from the contact surface By providing the arc-shaped linear protrusions, slipping between the stopper member and the mounting bracket is difficult to occur, and even when slipping occurs, the contact resistance is reduced, so that the stopper against vibration input This is useful because the generation of noise due to sticky slip between the member and the mounting bracket is suppressed.

It is a plane sectional view showing the important section of the state where the toe collect bush which is an example of the present invention is attached to the vehicle. It is a plane sectional view of the II-II line direction of Drawing 3 showing the toe collect bush. It is a left view which shows the same to-collect bush. It is a right view which shows the to-collect bush. It is a right view which shows a stopper member. It is sectional drawing of the VV line direction which shows a stopper member. It is a left view which shows a stopper member. It is a top view which shows roughly the assembly | attachment state to the both arm members of the suspension of a vehicle, and the vehicle body side of a to-collect bush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... To collect bush, 11 ... Bush main body, 12 ... Inner cylinder metal fitting, 14 ... Outer cylinder metal fitting, 15 ... Outer flange part, 21 ... Rubber elastic body, 22 ... Stopper rubber part, 27 ... Stopper member, 29 ... Contact surface, 31 ... linear protrusion, 32 ... groove part, 33 ... unevenness, 35 ... mounting bracket.

Claims (4)

An anti-vibration bush comprising: an inner cylinder bracket; an outer cylinder bracket that is disposed radially outwardly surrounding the inner cylinder bracket; and a rubber elastic body body that connects the inner cylinder bracket and the outer cylinder bracket. An annular stopper member made of a rubber elastic body that is fitted into the axial end portion of the inner cylindrical metal fitting at its center hole, and a plate-shaped mounting bracket that is fixed to the axial end portion; In the stopper member for anti-vibration bushing that is sandwiched between the end of the outer tube bracket in a compressed state,
Between a groove portion extending between the center hole and the outer peripheral edge at a plurality of locations spaced in the circumferential direction of the contact surface contacting the mounting bracket and recessed from the corresponding contact surface, and the groove portion adjacent in the circumferential direction. A vibration-proof bushing stopper member comprising a plurality of arc-shaped linear protrusions protruding from the contact surface. 2. The vibration-proof bushing stopper member according to claim 1, wherein the linear protrusions are further spaced apart from each other at a plurality of radial positions. 3. The vibration-proof bushing stopper member according to claim 1, wherein the stopper member is made of a self-lubricating rubber material having a low friction coefficient. The vibration-proof bushing stopper member according to any one of claims 1 to 3, wherein the contact surface is subjected to a graining process having a minute uneven shape.

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