JP2010242911A - Vehicular rubber bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular rubber bush constituted to effectively suppress relative slippage between the end face and a mounting porion of an inner cylinder fitting while eliminating a clearance between the end face and the mounting porion of the inner cylinder fitting in a state that they pressure-contact with each other. <P>SOLUTION: The vehicular rubber bush includes the cylindrical inner cylinder fitting 60, and a hollow rubber shock absorbing member into which the inner cylinder fitting is fitted in a state of passing therethrough. All over an end face 62 of the inner cylinder fitting, outer peripheral edge cutouts 74 which are opened to an outer peripheral edge 70 and not opened to an inner peripheral edge 72, and inner peripheral edge cutout s76 which are opened to the inner peripheral edge and not opened to the outer peripheral edge and which do not cross the outer peripheral edge cutouts are formed in an alternate manner. This constitution suppresses relative slippage between the end face and the mounting portion of the inner cylinder fitting while eliminating a clearance between the end face and the mounting portion of the inner cylinder fitting in the state that they pressure-contact with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicular rubber bush, and more specifically, to a vehicular vehicle including a cylindrical inner cylinder fitting and a hollow rubber cushioning member into which the inner cylinder fitting is fitted in the state where the inner cylinder fitting penetrates. Related to rubber bush.

  A rubber bush for a vehicle is fastened to the yoke by a bush mounting portion provided on the vehicle, for example, a bolt inserted through the inside of the inner cylinder metal fitting while the both end surfaces of the inner cylinder metal fitting are clamped by the yoke, etc. In many cases, the end surface of the inner cylinder fitting is pressed against the yoke by a bolt so as to prevent the inner cylinder fitting held between the yokes from rattling. However, if the end surface of the inner cylinder fitting is smooth, the relative sliding between the end surface of the inner cylinder fitting and the yoke is caused by some external force, and there is a possibility that the inner cylinder fitting, that is, the rubber bush will be loose. The following patent document describes a vehicular rubber bush having an end surface of an inner cylinder fitting that is knurled. In such a rubber bush, the relative sliding between the end face of the inner cylinder fitting and the yoke is effectively prevented. It is possible to suppress.

Japanese Utility Model Publication No. 2-429

  In the rubber bush described in the above-mentioned patent document, the end surface of the inner cylinder fitting and the yoke are formed by pressing the end portion of the inner cylinder fitting by knurling the end face and pressing it into the yoke. The relative slip is effectively suppressed. However, when the end surface of the inner cylinder fitting and the yoke are pressed against each other, a gap is formed between the groove on the end surface of the cylindrical fitting formed by knurling and the yoke, and water enters the inside of the cylindrical fitting from the gap. There is a risk of doing. Such intrusion of water into the cylindrical fitting causes corrosion of the cylindrical member or the like. The present invention has been made in view of such circumstances, and while effectively suppressing the relative slip between the end surface of the inner tube metal fitting and the yoke, the end surface of the inner tube metal fitting and the yoke are in pressure contact with each other. It is an object of the present invention to provide a vehicular rubber bush having a structure in which no gap is formed between them.

In order to solve the above problems, a rubber bush for a vehicle according to the present invention includes:
A cylindrical inner cylinder metal fitting, and a hollow rubber cushioning member having an inner peripheral surface into which the inner cylinder metal fitting is inserted in a state where the inner cylinder metal fitting penetrates,
The inner cylinder fitting is
At least one of both end faces, (A) an outer peripheral notch that opens to the outer peripheral edge and does not open to the inner peripheral edge, and (B) the outer peripheral edge that opens to the inner peripheral edge and does not open to the outer peripheral edge. It is set as the structure by which the inner periphery notch part which does not cross | intersect a notch part is formed alternately over the perimeter.

  In the rubber bush for a vehicle according to the present invention, the outer peripheral notch and the inner peripheral notch are formed on the end surface of the inner cylindrical fitting so as not to intersect with each other, and the outer peripheral notch and the inner peripheral notch are alternately arranged. Is formed. That is, the end surface of the inner cylinder fitting is a zigzag flat surface connected in the circumferential direction. For this reason, it becomes possible to effectively suppress the relative slip between the end surface of the inner cylinder fitting and the yoke by biting the end face of the inner cylinder fitting having a zigzag shape into the bush mounting portion. Moreover, since the end surface of the inner cylinder fitting is a plane connected in the circumferential direction, there is no gap between the end surface of the inner cylinder fitting and the yoke when they are in pressure contact. Therefore, according to the rubber bush for a vehicle of the present invention, the relative slip between the end face of the inner cylinder fitting and the yoke is effectively suppressed, and the end face of the inner cylinder fitting and the yoke are in pressure contact with each other. It is possible to eliminate the gap.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a suspension device including a suspension arm supported by a vehicle body via a vehicle rubber bush according to an embodiment of the present invention from a viewpoint from above the vehicle. It is sectional drawing of the rubber bush for vehicles in the AA 'line shown in FIG. It is a perspective view which shows only one end surface of the inner cylinder metal fitting which the rubber bush for vehicles of FIG. 2 has. It is a perspective view which shows only one end surface of the inner cylinder metal fitting which the conventional rubber bush for vehicles has.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings as the best mode for carrying out the present invention. In addition, this invention is not limited to the following Example, It can implement in the various aspect which gave various change and improvement based on the knowledge of those skilled in the art.

  FIG. 1 shows a suspension device 20 including a suspension arm that is rotatably supported on a vehicle body via a vehicle rubber bush 10 according to an embodiment of the present invention. The suspension device 20 is a multi-link suspension device, and includes a first upper arm 30, a second upper arm 32, a first lower arm 34, a second lower arm 36, and a toe control arm 38 as suspension arms that hold the wheels 12. ing. As will be described in detail later, one end of each of the five arms 30, 32, 34, 36, and 38 is rotatably connected to the vehicle body via the rubber bush 10, and the other end is connected to the wheel 30. It is rotatably connected to an axle carrier 40 that is rotatably held. With these five arms 30, 32, 34, 36, and 38, the axle carrier 40 can move up and down so as to draw a substantially constant locus with respect to the vehicle body.

  Since the attachment structures of the suspension arms 30, 32, 34, 36, and 38 to the vehicle body are almost the same, the attachment structure of the second lower arm 36 to the vehicle body will be described as a representative. A cylindrical member 50 having a cylindrical shape is fixed to the end of the second lower arm 36 on the vehicle body side, and the cylindrical member 50 is attached to a yoke portion 52 formed on a part of the vehicle body via the rubber bush 10. It has been. Specifically, as shown in FIG. 2, which is a cross-sectional view taken along the line AA ′ in FIG. 1, the rubber bush 10 includes a cylindrical outer cylinder fitting 54 that is fixedly fitted to the inner peripheral surface of the cylindrical member 50. A hollow rubber cushioning member 56 fixed to the inner peripheral surface of the outer cylindrical metal fitting 54 and a cylindrical inner cylindrical metal fitting 60 fixedly fitted to the inner peripheral surface 58 of the buffering member 56. It is configured to include. The inner cylinder fitting 60 penetrates the inner peripheral surface 58 of the buffer member 56 and is bolted to the yoke portion 52 in a state of being sandwiched by the yoke portions 52 formed on a part of the vehicle body at both end faces 62 of the inner cylinder fitting 60. Has been. More specifically, an insertion hole 64 is formed in the yoke portion 52, and the inner cylinder fitting 60 is connected to the bolt 66 and the nut with the shaft portion of the bolt 66 inserted through the insertion hole 64 and the inner cylinder fitting 60. 68 and fastened to the yoke portion 52.

  As shown in FIG. 3, each of both end faces 62 of the inner cylindrical metal fitting 60 has a V-shaped cutout (hereinafter referred to as “outer peripheral cutout”) that opens to the outer peripheral edge 70 and does not open to the inner peripheral edge 72. In some cases, 74 are formed at equal intervals on the outer periphery. On the other hand, a V-shaped notch portion (hereinafter referred to as “inner periphery notch portion”) that opens at the inner periphery 72 and does not open at the outer periphery 70 so as not to intersect the twelve outer periphery notches 74 at the inner periphery 72. 12) are formed at regular intervals. In other words, the outer peripheral notch 74 and the inner peripheral notch 76 are alternately formed over the entire circumference on each of the both end faces 62 of the inner cylindrical metal fitting 60, and the outer peripheral notch 74 and the inner peripheral notch 76. Thus, each of the both end faces 62 of the inner cylinder fitting 60 is a zigzag plane connected in the circumferential direction. In other words, each of both end surfaces 62 of the inner cylindrical metal fitting 60 is a flat surface that is continuous in the circumferential direction, and its outer peripheral edge 70 and inner peripheral edge 72 are serrated, that is, serrated. Yes. Incidentally, in FIG. 3, only one end surface of the inner cylinder fitting 60 is shown in a state where the outer cylinder fitting 54, the buffer member 56, and the like are removed. Thus, each of the both end faces 62 of the inner cylindrical metal fitting 60 has a zigzag shape, and is pressed against the yoke portion 52 by the bolt 66 and the nut 68. For this reason, each of both end faces 62 of the inner cylindrical metal fitting 60 bites into the yoke portion 52, and relative sliding with respect to the yoke portion 52 is prohibited.

  With the structure as described above, the cylindrical member 50, that is, the second lower arm 36 is attached to the vehicle body via the rubber bush 10, and relative sliding between the inner cylindrical metal fitting 60 and the yoke portion 52 is prohibited. The rotation of the second lower arm 36 with the elastic deformation of the buffer member 56 is allowed. Further, since the relative sliding between the inner cylinder fitting 60 and the yoke portion 52 is prohibited, the inner cylinder fitting 60 is prevented from rattling and the nut 68 is loosened by the rotation of the bolt 66 accompanying the rotation of the inner cylinder fitting 60. Can be prevented.

  In addition, since both end surfaces 62 of the inner cylindrical metal fitting 60 are flat surfaces connected in the circumferential direction, each end surface 62 and each yoke portion 62 are in contact with each other while the both end surfaces 62 are pressed against the yoke portion 52. There is no gap between the two. As shown in FIG. 4, each end face 82 of the inner tube fitting 80 of the conventional rubber bush has a shape in which a peak portion 84 protruding in the axial direction and a valley portion 86 recessed in the axial direction are continuous with each other. ing. For this reason, it is possible to inhibit the relative slip between the inner cylinder fitting 80 and the yoke portion by causing the peak portion 84 of the inner cylinder fitting 80 to bite into the yoke portion. However, a gap is formed between the valley portion 86 of the both end faces 82 and the yoke portion, and there is a possibility that water may enter the inner cylinder fitting 80 from the gap. Such intrusion of water into the inner cylinder fitting 80 causes corrosion of bolts and the like. In the inner cylinder fitting 60 of the present embodiment, as described above, between the both end faces 62 of the inner cylinder fitting 60 and the yoke section 52 in a state where the both end faces 62 are pressed against the yoke section 52, respectively. Since no gap occurs, it is possible to prevent water from entering the inside of the inner cylinder fitting 60, and it is also possible to prohibit relative sliding between the inner cylinder fitting 80 and the yoke portion.

  In the vehicle rubber bush 10 of the present embodiment, the outer peripheral notch 74 and the inner peripheral notch 76 are each V-shaped, and open to one of the outer peripheral and inner peripheral edges. Any shape that does not open to the other side may be used, and for example, a U shape, a wedge shape, or the like may be used. Further, the outer peripheral notch 74 and the inner peripheral notch 76 are each formed on the one end face 62, but may be formed more than 12 or less than 12. That is, the interval at which each of the outer peripheral notch portion and the inner peripheral notch portion is formed may be longer or shorter than the inner cylinder fitting 60 of the present embodiment. Moreover, although the space | interval in which each of an outer periphery notch part and an inner periphery notch part is formed may be the same like a present Example, it may differ.

  DESCRIPTION OF SYMBOLS 10: Rubber bushing for vehicles 56: Buffer member 58: Inner peripheral surface 60: Inner cylinder metal fitting 62: End surface 70: Outer peripheral edge 72: Inner peripheral edge 74: Outer peripheral edge notch part 76: Inner peripheral edge notch part

Claims (1)

A vehicular rubber bush including a cylindrical inner cylinder fitting, and a hollow rubber cushioning member having an inner peripheral surface into which the inner cylinder fitting is inserted in a state where the inner cylinder fitting is penetrated,
The inner cylinder fitting is
At least one of both end faces, (A) an outer peripheral notch that opens to the outer peripheral edge and does not open to the inner peripheral edge, and (B) the outer peripheral edge that opens to the inner peripheral edge and does not open to the outer peripheral edge. A rubber bush for a vehicle having a structure in which inner peripheral notch portions that do not intersect with the notch portions are alternately formed over the entire circumference.

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