JP2007313934A - Toe correct bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively increase a toe correction amount generated at inputting of load along a width direction of a vehicle, to increase freedom of creating angle of a toe correct surface, and to effectively reduce manufacturing cost of a device by commonalization of a part. <P>SOLUTION: In the toe correct bush 30, a first connection part 68 of a rubber-like elastic body 44 is filled between a first toe correct surface 54 and a first inclination part 64 and a second connection part 70 is filled between a second toe correct surface 60 and a second inclination part 66. Thereby, at inputting of lateral load along a width direction of the vehicle, by the first toe correct surface 54 and the first inclination part 64 elastically connected by the first connection part 68, component of force for relatively moving an inner cylinder 34 in a direction corresponding to a load input direction along a longitudinal direction can be generated, and by the second toe correct surface 60 and the second inclination part 66 elastically connected by the second connection part 70, component of force for relatively moving the inner cylinder 34 in the direction corresponding to the load input direction along the longitudinal direction can be also generated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a toe collect bush for slidably connecting a trailing arm in a trailing arm type suspension device to a vehicle body side.

  Conventionally, this type of toe collect bush is used for a trailing arm type rear suspension as shown in FIG. In FIG. 4, the twist beam 11 arranged with the vehicle width direction (arrow RH direction) as the longitudinal direction, and substantially longitudinal directions of the vehicle (arrow FR direction) at the longitudinal ends of the twist beam 11 as the substantially longitudinal direction. A pair of trailing arms 12 and 13 arranged, reinforcing members 14 and 15 attached to these connecting portions, and a spindle projecting outward from the vehicle at each rear end of the trailing arms 12 and 13 Toe collect bushes 100 and 101 are attached to the front end sides of trailing arms 12 and 13 of a suspension apparatus having 16 and 17, and these toe collect bushes 100 and 101 are connected to a pair of trailing arms 12 and 13 on the vehicle body side. Connect to swing.

  Left and right tires (not shown) are rotatably connected to the spindles 16 and 17. Cylindrical bush press-fit portions 12A and 13A are formed on the front end sides of the trailing arms 12 and 13 to allow the to-collect bushes 100 and 101 to be pressed and supported. Further, outside brackets 18 and 19 attached to the vehicle body side are provided outside the toe collect bushes 100 and 101, respectively, and inside brackets 20 attached to the vehicle body side inside the toe collect bushes 100 and 101, respectively. , 21 are provided.

  In the rear suspension, the outer brackets 18 and 19, the inner cylinder 102, and the inner brackets 20 and 21 are connected by bolts, so that the trailing arms 12 and 13 are swingably connected to the vehicle body side.

  FIG. 5 shows a to-collect bush 101 provided on the left side of FIG. The toe collect bush 100 on the right side is also in the opposite direction and has the same structure. The to-collect bush 101 includes an inner cylinder 102 and an outer cylinder 103 that are concentrically disposed, and a rubber-like elastic body 104 that is vulcanized and bonded therebetween. The peripheral wall on the rear side of the outer cylinder 103 is formed shorter in the axial direction than the peripheral wall on the front side, and the inner end on the rear side is bent rearward to form a bent portion 103A. A ring-shaped stopper stopper plate 105 having a radial direction as a surface direction is fixed to the peripheral surface on the inner end side of the inner cylinder 102 by welding. Further, the inner end side of the outer cylinder 103 is formed on a peripheral wall 103B that is obliquely bent forward, and the front side of the stopper plate 105 is also bent in parallel with the peripheral wall 103B. 6 is a side view of the toe collect bush 101 as viewed from the inner end side, and FIG. 5 is a cross-sectional view taken along line AA of FIG. FIG. 7 shows a front view of the toe collect bush 101, and when there is a load input from the inner side to the outer side (X +) along the width direction, the outer cylinder 103 moves from the rear side to the front side along the front-rear direction. Move to (Y +).

  In the conventional example described above, the rubber-like elastic body 104 is also filled between the bent portion 103A and the plate 105 in order to ensure the spring constant in the X direction (X + and X− in FIG. 7). When the load is input, the outer cylinder 103 moves in the Y-direction. This amount of movement is the amount of to collect, and therefore a to collect function is produced for an input in the X-direction. However, there may be a case where a sufficient to collect amount cannot be obtained only with the inclined portion on the front side.

Therefore, in the toe collect bush described in Patent Document 1, a bent portion is provided on each of the front side and the rear side of the outer cylinder, and the peripheral wall portion parallel to the bent portion is also provided on the front side and the rear side of the stopper plate. This occurs when a load is input along the width direction by filling a rubber-like elastic body between the bent portion on the front side and the peripheral wall portion and between the bent portion on the rear side and the peripheral wall portion. The amount of to collect is increased effectively.
JP 2000-264030 A

  However, in the toe collect bush as described above, the toe collect amount with respect to the input load along the width direction changes according to the required steering characteristics. For this reason, it is necessary to change the inclination angle of the bent portion and the collecting wall portion based on the axis of the inner cylinder according to the required steering characteristics and the rigidity of the rubber-like elastic body. In the to-collect bush, the bent part is formed integrally with the outer cylinder, so that there is a limit to the angle of the bent part (flange part) of the outer cylinder by drawing, and the bent part and the wall collecting part It is necessary to prepare a dedicated outer cylinder and inner cylinder for each set value of the inclination angle.

  As a result, in the toe collect bush described in Patent Document 1, even if the shape of the other portions except the inclination angle of the bent portion and the collecting wall portion is the same, the dedicated parts (outer cylinders) are different for each of the different inclination angles. And a stopper plate) are required, and there is a problem that it is difficult to reduce the manufacturing cost due to the common use of parts.

  The object of the present invention is to increase the degree of freedom of angulation of the to-collect surface while effectively increasing the amount of to-collect when the load is input along the width direction of the vehicle in consideration of the above fact. In addition, it is an object of the present invention to provide a to-collect bush that can effectively reduce the manufacturing cost of the apparatus by sharing parts.

  In order to solve the above-mentioned problems, a toe collect bush according to claim 1 of the present invention is a twist beam arranged with the width direction of the vehicle as a longitudinal direction, and the longitudinal direction of the vehicle as a longitudinal direction, and is provided at both ends of the twist beam. And a trailing arm in a suspension device having a trailing arm connected to each other, wherein the front end side of the trailing arm is swingably connected to the vehicle body side, and the trailing direction is arranged such that the width direction is an axial direction. An outer cylinder coupled to the front end side of the arm, an inner cylinder disposed on the inner circumferential side of the outer cylinder and pivotably coupled to the vehicle body side, and formed at an end of the outer cylinder, toward the outer circumferential side An extending flange portion, and an elastic body that elastically connects the outer cylinder and the inner cylinder, and is disposed at a position facing the flange portion, and has a small inclined to collect surface. At least one stopper plate formed on the inner cylinder is fixed to the end of the inner cylinder, and a toe adjustment member provided with an inclined surface parallel to the to-collect surface of the stopper plate is disposed on the flange of the outer cylinder. A part of the elastic body is filled between the to-collect surface and the inclined surface of the toe adjusting member.

  In the toe collect bush according to the first aspect of the present invention, a portion of the elastic body is filled between the to-collect surface and the inclined surface of the toe adjusting member, so that when the load is input along the width direction of the vehicle, the elastic body The elastic force connected to the collect surface and the inclined surface can generate a component force that relatively moves the inner cylinder along the front-rear direction in a direction corresponding to the load input direction.

  In the toe collect bush according to claim 1, since the toe adjusting member is disposed on the flange portion of the outer cylinder, the plurality of types of toe adjusting members having different inclination angles of the to-collect surfaces and the plurality of types of toe adjustments are provided. If a plurality of types of stopper plates having inclined surfaces corresponding to the respective members are prepared in advance, the toe adjustment member and the stopper plate that match the required cornering characteristics and the rigidity of the rubber-like elastic body are used as component parts of the device. The device can be assembled using these toe adjustment members and stopper plates.

  That is, according to the toe collect bush according to the first aspect, the toe adjusting member and the stopper plate can be used in accordance with the required characteristics (toe collect characteristics) while sharing the outer cylinder and the inner cylinder, which are the main parts of the apparatus. Since it can be replaced with a different one, even if the required to collect characteristics are various, it is possible to effectively reduce the manufacturing cost of the device by sharing the parts and increase the degree of freedom of the angle of the to collect surface. be able to.

  The toe collect bush according to claim 2 of the present invention is the toe collect bush according to claim 1, wherein a plurality of the toe collect surfaces and the toe adjusting members are provided.

  A toe collect bush according to claim 3 of the present invention is the toe collect bush according to claim 2, wherein the plurality of to collect surfaces are arranged symmetrically with respect to the axis of the inner cylinder, and The toe adjusting members are arranged symmetrically with respect to the axis of the inner cylinder.

  A toe collect bush according to claim 4 of the present invention is the toe collect bush according to any one of claims 1 to 3, wherein the toe collect surface is inclined with respect to a radial direction centering on an axis of the inner cylinder. The angle is set within a range of 30 ° to 50 °.

  The toe collect bush according to claim 5 of the present invention is the toe collect bush according to any one of claims 1 to 4, wherein the toe collect bush is along a radial direction centering on an axis of the inner cylinder of the to collect surface. The width is longer than the diameter of the inner cylinder.

  The toe collect bush according to claim 4 of the present invention is the toe collect bush according to any one of claims 1 to 5, wherein the elastic body has a front end side and a rear end side from an outer end surface of the elastic body. A first straight part and a second straight part extending inward are formed, and the first straight part is extended to the stopper plate side with respect to an extension line of the to-collect surface. And

  As described above, according to the toe collect bush of the present invention, it is possible to effectively increase the to collect amount generated when a load is input along the width direction of the vehicle, and to increase the degree of freedom in angling the to collect surface. In addition, the manufacturing cost of the apparatus can be effectively reduced by sharing the parts.

  Hereinafter, a to-collect bush according to an embodiment of the present invention will be described with reference to the drawings.

  1 to 3 illustrate a to-collect bush according to an embodiment of the present invention. This toe collect bush 30 is press-fitted and fixed to the front end side of the left trailing arm 13 in place of the conventional toe collect bush 101 shown in FIG. Further, the toe collect bush 30 is press-fitted and fixed to the front end side of the right trailing arm 12 in a state where the toe-collect bush 30 is reversed left and right.

  The toe collect bush 30 is provided with a thin-walled cylindrical outer cylinder 32 arranged so that the vehicle width direction (the direction of the arrow RH in FIG. 4) is the axial direction, and on the inner peripheral side of the outer cylinder 32. A cylindrical inner cylinder 34 arranged substantially concentrically is provided. The inner cylinder 34 is longer in the axial direction than the outer cylinder 32, and both end portions of the inner cylinder 34 protrude from both ends of the outer cylinder 32.

  Here, in the toe collect bush 30 on the left side, as with the toe collect bush 101, the outer cylinder 32 is press-fitted and fixed in the bush press-fit portion 12A provided at the front end of the trailing arm 12, and the inner cylinder 34 is The outer bracket 19 and the inner bracket 21 are sandwiched between the outer bracket 19 and the inner bracket 21 provided on the vehicle body side, and are attached to the outer bracket 19 and the inner bracket 21 by bolts 36 and nuts 37 (see FIG. 4) that penetrate the inner peripheral side. It is connected so that it can swing.

  Also, the toe collect bush 30 on the right side is, as with the toe collect bush 100, the outer cylinder 32 is press-fitted and fixed in the bush press-fit portion 13A provided at the front end of the trailing arm 13, and the inner cylinder 34 is mounted on the vehicle body side. The outer bracket 18 and the inner bracket 20 are sandwiched between the outer bracket 18 and the inner bracket 20 and are pivotally connected to the outer bracket 18 and the inner bracket 20 by bolts 36 and nuts 37 penetrating the inner periphery thereof. .

  As shown in FIG. 1, the outer cylinder 32 has a flange portion 38 formed by bending the inner end in the width direction toward the outer peripheral side. The flange portion 38 is formed with a flat plate-like first support portion 40 extending forward of the vehicle on the front end side along the longitudinal direction of the vehicle, and a flat plate-like first portion extending rearward of the vehicle on the rear end side. Two support portions 42 are formed. The second support part 42 is located outside the first support part 40 along the width direction.

  The toe collect bush 30 includes a thick cylindrical rubber-like elastic body 44 that is disposed between the outer cylinder 32 and the inner cylinder 34 and elastically connects the outer cylinder 32 and the inner cylinder 34. The rubber-like elastic body 44 is vulcanized and bonded to the inner peripheral surface of the outer cylinder 32 and the outer peripheral surface of the inner cylinder 34. The toe collect bush 30 includes a first toe adjusting member 46 that abuts against the first support portion 40 of the flange portion 38 from the inside in the width direction, and a second toe adjusting member that abuts against the second support portion 42 from the inside in the width direction. 48 is provided.

  The first toe adjusting member 46 is formed, for example, by pressing a metal plate such as a steel plate, and has a substantially V-shaped cross section that opens outward in the width direction. In the first toe adjustment member 46, an outer peripheral contact portion 50 and an inner peripheral contact portion 52 extending in the radial direction are bent at the outer peripheral end portion and the inner peripheral end portion, respectively. The outer peripheral contact portion 50 and the inner peripheral contact portion 52 are in contact with the outer peripheral side and the inner peripheral side of the first support portion 40 so as to be in a surface contact state. In this state, the first toe adjustment member 46 is fixed to the first support portion 40 by welding, screwing, or the like. The first toe adjusting member 46 is formed with a first to-collect surface 54 that is inclined inward in the width direction at a predetermined angle while extending forward in the front-rear direction on the end surface on the inner side in the width direction.

  The second toe adjustment member 48 is also formed by, for example, pressing a metal plate such as a steel plate, and has a substantially V-shaped cross section that opens outward in the width direction. The second toe adjustment member 48 is formed with an outer peripheral contact portion 56 and an inner peripheral contact portion 58 that are radially extended at the outer peripheral end portion and the inner peripheral end portion, respectively. The outer peripheral contact portion 56 and the inner peripheral contact portion 58 are in contact with the outer peripheral side and the inner peripheral side of the second support portion 42 so as to be in a surface contact state. In this state, the second toe adjusting member 48 is fixed to the second support portion 42 by welding, screwing or the like. The second toe adjusting member 48 is formed with a second to-collect surface 60 that is inclined to the outer side in the width direction at a predetermined angle while extending rearward along the front-rear direction on the end surface on the inner side in the width direction. The second to collect surface 60 is substantially parallel to the first to collect surface 54.

  As shown in FIG. 1, the toe collect bush 30 includes an annular stopper plate 62 fixed to the outer peripheral surface of the inner cylinder 34 by welding or the like. The stopper plate 62 is formed by, for example, pressing a metal plate such as a steel plate, and is disposed inside the outer cylinder 32 along the width direction. The stopper plate 62 is formed with a first inclined portion 64 substantially parallel to the first toe collect surface 54 on the front end side corresponding to the first toe adjustment member 46 and a rear end corresponding to the second toe adjustment member 48. A second inclined portion 66 that is substantially parallel to the second to-collect surface 60 is formed on the side.

  The rubber-like elastic body 44 includes a first connecting portion 68 filled between the first to collect surface 60 and the first inclined portion 64, and a second to collect surface 60 and the second inclined portion 66. The 2nd connection part 70 with which it fills is formed integrally. The first connecting portion 68 is vulcanized and bonded to the first to collect surface 54 and the first inclined portion 64, respectively, and elastically connects the first to collect surface 54 and the first inclined portion 64. The second connecting portion 70 is vulcanized and bonded to the second to collect surface 60 and the second inclined portion 66, respectively, and elastically connects the second to collect surface 60 and the second inclined portion 66.

  In the to-collect bush 30, the inclination angles θ <b> 1 and θ <b> 2 with respect to the radial direction around the axis S of the first to-collect surface 54 and the second to-collect surface 60 are set within a range of 30 ° to 50 °. In the present embodiment, the inclination angles θ1 and θ2 are each set to about 45 °.

  As shown in FIG. 2, each of the first to collect surface 54 and the second to collect surface 60 has a longer width along the radial direction centered on the axis S than the outer diameter of the inner cylinder 34. Further, the first to-collect surface 54 is formed in a substantially fan shape whose projection shape along the axial direction becomes wider from the inner peripheral side toward the outer peripheral side. On the other hand, the second to-collect surface 60 is formed in an arc shape in which the inner peripheral edge and the outer peripheral edge in the projected shape along the axial direction are curved around the axis S, and both side edges are parallel to each other, It is formed in a straight line extending along the radial direction.

  As shown in FIG. 1, the rubber-like elastic body 44 includes a first straight portion 72 extending inward from the outer end surface of the rubber-like elastic body 44 on the front end side and the rear end side along the vehicle front-rear direction. And the 2nd curling part 74 is formed, respectively. Here, the first curving portion 72 is in contact with the first to collect surface 54 and extends to the stopper plate 62 side from the extension line extending to the axis S side. Further, the second curb portion 74 is also in contact with the second to collect surface 60 and extends to the stopper plate 62 side from the extension line extending to the axis S side.

  Next, the operation of the to-collect bush 30 according to the present embodiment configured as described above will be described.

  A cornering force (lateral load) along the width direction acts on the trailing arms 12 and 13 in the trailing arm type rear suspension shown in FIG. 4 at the time of vehicle cornering. , 13 respectively transmit a lateral load to the toe collect bush 30. At this time, in the toe collect bush 30, the rubber-like elastic body 44 is elastically deformed along the axial direction by the lateral load from the trailing arms 12 and 13, and a part of this lateral load is caused by the first connecting portion 68. The first to-collect surface 54 and the first inclined portion 64 that are elastically connected generate a component force in the component force (front-rear load) along the front-rear direction of the vehicle, and are elastically connected by the second connection portion 70. The second to-collect surface 60 and the second inclined portion 66 thus generated generate a component force (front-rear load) along the front-rear direction of the vehicle.

  At this time, when the left toe collect bush 30 and the right toe collect bush 30 receive a lateral load in the same direction, they are opposite to each other (one on the front side in the front-rear direction and the other on the rear side in the front-rear direction). Generates longitudinal load. As a result, the trailing arms 12 and 13 are inclined such that the rear wheel 118 is inclined toward the toe-in side.

  As described above, in the toe collect bush 30 according to the present embodiment, the first connecting part 68 of the rubber-like elastic body 44 is filled between the first toe collect surface 54 and the first inclined part 64, and the second By filling the connecting portion 70 between the second to-collect surface 60 and the second inclined portion 66, the connecting portion 70 is elastically connected by the first connecting portion 68 when a lateral load along the width direction of the vehicle is input. The first to collect surface 54 and the first inclined portion 64 can generate a component force that relatively moves the inner cylinder 34 in the direction corresponding to the load input direction along the front-rear direction, and is elastically connected by the second connecting portion 70. The second to collect surface 60 and the second inclined portion 66 can also generate a component force that moves the inner cylinder 34 in the direction corresponding to the load input direction along the front-rear direction. Generate -Compared with the conventional to collect bush having only one collect surface and one inclined portion, the to collect amount generated when a load is input along the width direction of the vehicle can be effectively increased, and the to collect surfaces 54 and 60 are outside. Since the toe adjusting members 46 and 48 are formed separately from the cylinder 32, the toe collect surfaces 54 and 60 are compared with the case where the toe collect surface is formed by bending the end of the outer cylinder to the outer peripheral side. The degree of freedom of angling can be increased.

  In the toe collect bush 30, a part of the rubber-like elastic body 44 (first connecting portion 68) is filled between the first to collect surface 54 and the first inclined portion 64, and the second to collect surface 60. A part of the rubber-like elastic body 44 (second connecting portion 70) is also filled between the second inclined portion 66 and the second inclined portion 66, so that a to-collect surface and an inclined portion that generate a component force when a lateral load is input are provided. Compared to a conventional to-collect bush having only one piece, the spring constant of the device along the axial direction can be adjusted in a wide range.

It is front sectional drawing which shows the structure of the toe collect bush which concerns on embodiment of this invention. It is the side view which looked at the toe collect bush shown by FIG. 1 from the vehicle width direction inner side. It is a front view of the toe collect bush shown by FIG. It is a top view which shows the structure of the trailing arm type rear suspension which can apply the toe collect bush which concerns on this embodiment, and the conventional toe collect bush. It is front sectional drawing which shows the structure of the conventional toe collect bush. It is the side view which looked at the toe collect bush shown by FIG. 5 from the vehicle width direction inner side. It is a front view of the toe collect bush shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Twist beam 12, 13 Trailing arm 30 Toe collect bush 32 Outer cylinder 34 Inner cylinder 38 Flange part 44 Rubber-like elastic body 46 Toe adjustment member 48 Toe adjustment member 54 1st toe correction surface 60 2nd toe correction surface 62 Stopper plate 64 1st inclination part 66 2nd inclination part 68 1st connection part (elastic body)
70 Second connecting part (elastic body)
72 First curb portion 74 Second curb portion

Claims (6)

A front end side of a trailing arm in a suspension device having a twist beam arranged with the width direction of the vehicle as a longitudinal direction and a trailing arm with the longitudinal direction of the vehicle as a longitudinal direction and connected to both ends of the twist beam. In the toe collect bush that pivotably connects to the vehicle body side,
An outer cylinder arranged so that the width direction is an axial direction and connected to the front end side of the trailing arm, and an inner cylinder arranged on the inner peripheral side of the outer cylinder and swingably connected to the vehicle body side And a flange portion that is formed at an end of the outer cylinder and extends to the outer peripheral side, and an elastic body that elastically connects the outer cylinder and the inner cylinder,
A stopper plate disposed at a position facing the flange portion and having at least one inclined to collect surface formed thereon is fixed to the end of the inner cylinder,
A toe adjusting member provided with an inclined surface parallel to the toe collect surface of the stopper plate is disposed on the flange portion of the outer cylinder,
A toe collect bush, wherein a part of the elastic body is filled between the toe collect surface and an inclined surface of the toe adjusting member.   The toe collect bush according to claim 1, wherein a plurality of the toe collect surfaces and the toe adjusting members are provided.   The plurality of toe correction surfaces are arranged symmetrically with respect to the axis of the inner cylinder, and the plurality of toe adjustment members are arranged symmetrically with respect to the axis of the inner cylinder. The to-collect bush according to claim 2.   4. The toe according to claim 1, wherein an inclination angle of the to-collect surface with respect to a radial direction centering on an axis of the inner cylinder is set in a range of 30 ° to 50 °. Collect bush.   The toe according to any one of claims 1 to 4, wherein a width along a radial direction centering on an axis of the inner cylinder of the to-collect surface is longer than a diameter of the inner cylinder. Collect bush. Forming a first curb portion and a second curb portion extending inward from the outer end surface of the elastic body on the front end side and the rear end side of the elastic body,
The toe collect bush according to any one of claims 1 to 5, wherein the first straight part is extended to the stopper plate side with respect to an extension line of the toe collect surface.

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