JP2016153255A - Suspension bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension bush in which durability is improved compared with a conventional one even when it is installed in the trailing arm.SOLUTION: A suspension bush comprises: an inner cylindrical member; an outer cylindrical member which is disposed in the outer diameter side of the inner cylindrical member and connected with a trailing arm 16; a rubber elastic body which is mounted between the inner cylindrical member and the outer cylindrical member; and a shaft member 56 which penetrates the inner cylindrical member and has a first attachment part 64a and a second attachment part 64b to be attached with a vehicle body at both sides in an axial direction. An axis line A of the shaft member 56 is arranged inclined in a direction orthogonal to the line F of force applied to the trailing arm 16 with respect to a virtual straight line B connecting between a center C1 of the first attachment part 64A and a center C2 of the second attachment part 64b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a suspension bush connected to a trailing arm of a suspension device.

  For example, as shown in FIG. 5, Patent Document 1 discloses an inner shaft member 1, an outer cylinder member 2 disposed on the outer peripheral side of the inner shaft member 1, an inner shaft member 1 and an outer cylinder member 2. The structure of the bush 4 provided with the rubber elastic body 3 to connect is disclosed. Mounting portions 6a and 6b having mounting holes 5a and 5b are provided on both sides of the inner shaft member 1 in the axial direction. Further, in the bush 4 shown in FIG. 5, the imaginary line T1 connecting the centers (fastening centers) of the mounting holes 5a and 5b and the axis T2 of the inner shaft member 1 are set to coincide with each other (T1 = T2). ).

  FIG. 5 shows a state in which the bush 4 disclosed in Patent Document 1 is connected to the vehicle front side end portion of the trailing arm 7.

Japanese Patent Application Laid-Open No. 2011-231813

  By the way, when the bush is disposed at the vehicle front side end of the trailing arm, generally, the axis of the bush (inner shaft member) is perpendicular to the direction of the line of force applied to the trailing arm. Preferably they are arranged. This is because elastic deformation of the bushing in the direction of the force applied to the trailing arm is allowed, and compliance in the direction of the force line (configuration that allows a certain degree of deformation and displacement with respect to the input) can be ensured. .

  However, due to restrictions such as the layout of the vehicle body and the suspension structure, the axis T2 of the bush 4 (inner shaft member 1) is actually perpendicular to the direction of the force line of the trailing arm 7, as shown in FIG. Is arranged at a predetermined angle θ (θ <90 degrees). For this reason, for example, when a large load is applied to the bush 4, the displacement of the inner shaft member 1 in the axial direction increases, and the durability of the bush 4 may be reduced.

  The present invention has been made in view of the above points, and provides a suspension bush that can improve durability compared to the conventional art even when it is disposed on a trailing arm. Objective.

  In order to achieve the above object, the present invention provides an inner cylinder member, an outer cylinder member disposed on the outer diameter side of the inner cylinder member and connected to a trailing arm, the inner cylinder member, and the outer cylinder. A rubber elastic body interposed between the member and a shaft member penetrating the inner cylinder member, provided on both sides along the axial direction are a first attachment portion and a second attachment portion attached to the vehicle body; The axis of the shaft member is perpendicular to the line of force applied to the trailing arm with respect to a virtual straight line connecting the center of the first mounting portion and the center of the second mounting portion. It is characterized by being tilted.

  In the present invention, the axis of the shaft member is arranged such that the axis of the shaft member is perpendicular to the force line direction applied to the trailing arm with respect to a virtual straight line connecting the center of the first mounting portion and the center of the second mounting portion. It is set by tilting the axis of the member. Therefore, in the present invention, for example, when a force in the direction of the force line is applied to the trailing arm, the elastic deformation of the suspension bush in the direction of the force line applied to the trailing arm is allowed, and the direction of the force line Compliance (configuration that allows a certain degree of deformation / displacement to the input) can be ensured. The line of force refers to the force applied to the trailing arm by the action of pulling the wheel center of the wheel toward the rear of the vehicle.

  Thereby, in this invention, the displacement to the axial direction of a shaft member is suppressed, the load provided with respect to a rubber elastic body is reduced, and durability of a suspension bush is improved compared with a prior art. it can.

  Furthermore, in this embodiment, for example, when the wheels get over a step while the vehicle is traveling, the compliance in the direction of the line of force of the trailing arm can be ensured to improve the riding comfort of the vehicle.

  Furthermore, the present invention is characterized in that a resin body is interposed between the shaft member and the inner cylinder member.

  According to the present invention, the resin body is interposed between the shaft member and the inner cylinder member, thereby reducing the weight of the entire shaft member and the suspension bush and reducing the cost of the entire shaft member and the suspension bush. This can be achieved and the durability of the suspension bushing can be improved.

  Furthermore, the present invention is characterized in that an axis of the shaft member and a line of force applied to the trailing arm are orthogonal to each other.

  According to the present invention, the axial line of the shaft member and the force line applied to the trailing arm are arranged so as to be orthogonal to each other, so that the displacement of the shaft member in the axial direction is suppressed, and the rubber elastic body On the other hand, the load applied to the suspension bush can be reduced, and the durability of the suspension bush can be improved as compared with the prior art.

  In the present invention, it is possible to obtain a suspension bush capable of improving the durability as compared with the conventional case even when it is disposed on the trailing arm.

1 is a perspective view of a suspension device incorporating a suspension bush according to an embodiment of the present invention. FIG. 2 is a partially enlarged plan view of the suspension device shown in FIG. 1. (A) is a partially broken exploded top view of a suspension bush, (b) is a longitudinal cross-sectional view along the III-III line of (a). (A) is a partially broken plan view of a shaft member according to a modification, and (b) is an end view taken along line IV-IV in (a). It is sectional drawing which shows the state which connected and arrange | positioned the bush disclosed by patent document 1 to the vehicle front side edge part of the trailing arm.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a perspective view of a suspension device incorporating a suspension bush according to an embodiment of the present invention. FIG. 2 is a schematic top view of the trailing arm and suspension bush shown in FIG. In each figure, “front and rear” indicates the vehicle longitudinal direction, “left and right” indicates the vehicle width direction (left and right direction), and “up and down” indicates the vehicle vertical direction (vertical vertical direction).

  As shown in FIG. 1, the suspension device 10 includes a knuckle 14 that rotatably supports a wheel (left rear wheel) 12 via an axle (not shown), and a trailing arm 16 that supports the vehicle front of the knuckle 14. The upper arm 18 that supports the upper part of the knuckle 14, the lower arm 20 that supports the lower rear part of the knuckle 14, the control arm 22 that supports the lower center of the knuckle 14, the damper 24, and the damper spring 26 are configured. ing. The suspension device 10 is configured as an independent suspension type rear suspension that rotatably supports left and right rear wheels.

  The knuckle 14 includes a vehicle front connecting portion 14 a to which the rear end portion of the trailing arm 16 is fastened via four bolts 28, an upper connecting portion 14 b to which the upper arm 18 is connected via a bush 30, and a lower arm 20. Are connected to each other via a bush 32 and a lower center connecting portion 14d to which the control arm 22 is connected.

  The trailing arm 16 is positioned on the vehicle rear side of the arm main body portion 16a and the arm main body portion 16a extending substantially along the vehicle front-rear direction, and is fastened to the vehicle front connection portion 14a of the knuckle 14 via a bolt 28. The vehicle has a vehicle rear end portion 16b and a vehicle front end portion 16c that is located in front of the arm main body portion 16a and on which the suspension bushing 34 according to the present embodiment is mounted.

  Bushes 36 are connected to the outer end in the vehicle width direction and the inner end in the vehicle width direction of the upper arm 18, respectively. A bush 38 is connected to the inner end of the lower arm 20 in the vehicle width direction. A bush 40 is connected to the inner end of the control arm 22 in the vehicle width direction.

  The trailing arm 16, the upper arm 18, the lower arm 20, and the control arm 22 are mounted on a vehicle body (not shown) via suspension bushes 34 and bushes 36, 38, and 40, respectively.

  3A is a partially broken exploded top view of the suspension bush, and FIG. 3B is a longitudinal sectional view taken along line III-III of FIG. 3A.

  As shown in FIG. 3A, the suspension bush 34 according to the present embodiment includes an inner cylinder member 50 and an outer cylinder member that is disposed on the outer diameter side of the inner cylinder member 50 and connected to the trailing arm 16. 52, a rubber elastic body 54 interposed between the inner cylinder member 50 and the outer cylinder member 52, and a shaft member 56 that penetrates the inner cylinder member 50.

  The inner cylinder member 50 is coaxially coupled and includes an outer collar 50a disposed on the outer diameter side and an inner collar 50b disposed on the inner diameter side. An intermediate sleeve 58 is provided between the inner cylinder member 50 and the outer cylinder member 52. The intermediate sleeve 58 has an arcuate recess 60 extending along the circumferential direction. A space 62 sealed between the arcuate recess 60 and the inner wall of the outer cylinder member 52 is formed. The space 62 functions as a liquid seal compliance bush by sealing a liquid (not shown).

  On both sides along the axial direction of the shaft member 56, there are provided a first mounting portion 64 a and a second mounting portion 64 b that are formed by flat plate pieces and are attached to a vehicle body (not shown). Between the first attachment portion 64a and the second attachment portion 64b, there is provided a shaft main body portion 66 having a solid body with a hexagonal cross section (see FIG. 3B). By making the axis orthogonal cross section of the shaft main body portion 66 a hexagonal shape, it is possible to exert a detent function of the shaft member 56 that is press-fitted into the inner cylinder member 50. In addition, the cross-sectional shape of the shaft main body 66 is not limited to a hexagon, and may be any shape having a non-rotating function such as a non-circular shape. Moreover, it is not limited to a solid body, The hollow body which has predetermined rigidity and intensity | strength may be sufficient.

  A substantially circular mounting hole 70a through which the connecting bolt 68a (see FIG. 1) is inserted is formed in the first mounting portion 64a. The second mounting portion 64b is formed with a substantially oval mounting hole 70b through which another connecting bolt 68b (see FIG. 1) is inserted.

  Between the shaft main body 66 and the second attachment portion 64b, an offset deformation portion 72 made of a flat plate piece similar to the second attachment portion 64b is provided. By providing this offset deforming portion 72, the axis A of the shaft member 56 (shaft main body portion 66) is set to the fastening center C1 of the first mounting portion 64a (shaft center of the connecting bolt 68a) and the fastening center of the second mounting portion 64b. It can be set to be different from the virtual straight line B connecting C2 (the axial center of the connecting bolt 68b) and tilted in the direction perpendicular to the direction of the line of force F applied to the trailing arm 16 described later.

  The suspension device 10 incorporating the suspension bush 34 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

  In the bush 4 according to the prior art shown in FIG. 5, the virtual line T1 connecting the centers (fastening centers) of the mounting holes 5a and 5b and the axis T2 of the inner shaft member 1 are set to coincide with each other (T1). = T2). In contrast, in the present embodiment, by providing the shaft member 56 with the offset deformation portion 72, the axis A of the shaft member 56 (shaft main body portion 66) is connected to the fastening center C1 (connection bolt 68a) of the first mounting portion 64a. Of the second mounting portion 64b and an imaginary straight line B connecting the fastening center C2 (the axial center of the connecting bolt 68b) and a direction perpendicular to the direction of the force line F applied to the trailing arm 16. It is possible to set it to be inclined.

  Therefore, in the present embodiment, the axis A of the shaft member 56 (shaft body portion 66) of the suspension bush 34 is inclined by tilting the axis A of the shaft member 56 (shaft body portion 66) with respect to the virtual straight line B. It can be set to be in a direction perpendicular to the direction of the line of force F applied to the arm 16.

  As a result, in the present embodiment, as shown in FIG. 2, for example, when a force in the direction of the force line F is applied to the trailing arm 16 of the suspension device 10, the force applied to the trailing arm 16. The elastic deformation of the suspension bushing 34 in the direction of the line F is preferably permitted, and compliance in the direction of the line of force F (a configuration that allows a certain degree of deformation / displacement with respect to the input) can be ensured. The force line F is a force applied to the trailing arm 16 by a force that pulls the wheel center of the wheel 12 toward the rear of the vehicle.

  Thereby, in this embodiment, the displacement of the shaft member 56 in the axial direction is suppressed, the load applied to the rubber elastic body 54 is reduced, and the durability of the suspension bush 34 is improved compared to the conventional technique. Can be improved.

  Furthermore, in the present embodiment, for example, when the wheel 12 gets over a step while the vehicle is traveling, the compliance in the direction of the force line F of the trailing arm 16 is ensured to improve the riding comfort of the vehicle. Can do.

  Furthermore, in the present embodiment, the axis A of the shaft member 56 can be easily tilted with respect to the virtual straight line B by a simple structure in which the shaft member 56 is provided with the offset deformation portion 72.

  As described above, in this embodiment, for example, the axis A of the shaft member 56 (the shaft main body portion 66) is given to the trailing arm 16 even when the vehicle layout and the suspension structure are restricted. It can be set to be perpendicular to the direction of the force line F.

  Fig.4 (a) is a partially broken plan view of the shaft member which concerns on a modification, FIG.4 (b) is an end elevation along the IV-IV line of Fig.4 (a).

  In the shaft member 56a according to this modified example, as shown in FIG. 4A, the entire shaft member 56a including the first mounting portion 64a, the shaft main body portion 66, and the second mounting portion 64b is formed in a flat plate shape. It is formed of a single metal plate body. A substantially cylindrical resin body 80 (see FIG. 4B) is interposed between the shaft main body 66 of the plate-shaped shaft member 56a and the inner wall of the inner cylinder member 50 (see FIG. 3A). The shaft member 56 is different from the shaft member 56 shown in FIG. In other words, the shaft member 56 of FIG. 3A is entirely formed of a metal material, whereas the shaft member 56a according to the modified example is a combination of the metal plate body and the resin body 80. Are different in that they are integrally coupled.

  The resin body 58 is formed, for example, by resin molding in which a shaft member 56a, an inner cylinder member 50, an outer cylinder member 52, etc. are disposed in a cavity of a mold (not shown), and then the molten resin is filled in the cavity and solidified. By performing, the substantially cylindrical resin body 80 which covers the shaft main body 66 of the shaft member 56a can be formed.

  A plurality of through holes 82 penetrating the plate body are arranged in the shaft main body 66 so as to be separated from each other in the axial direction of the shaft main body 66, and the through holes 82 are closed by the resin body 80.

  Further, in the shaft member 56a, offset deforming portions 72a and 72a are provided between the first mounting portion 64a and the shaft main body portion 66 and between the second mounting portion 64b and the shaft main body portion 66, respectively. Yes. Accordingly, the axis A of the shaft member 56a (the shaft main body portion 66) can be set so as to be perpendicular to the direction of the line of force F applied to the trailing arm 16.

  With this configuration, in the shaft member 56a, the overall weight of the shaft member 56a and the suspension bush 34 can be reduced, and the cost of the entire shaft member 56a and the suspension bush 34 can be reduced. The durability of can be improved.

DESCRIPTION OF SYMBOLS 10 Suspension apparatus 16 Trailing arm 34 Suspension bush 50 Inner cylinder member 52 Outer cylinder member 54 Rubber elastic body 56, 56a Shaft member 64a 1st attaching part 64b 2nd attaching part 80 Resin body A Axis line of shaft member B Virtual straight line C1, C2 fastening center F force line

Claims (3)

An inner cylinder member;
An outer cylinder member disposed on the outer diameter side of the inner cylinder member and connected to a trailing arm;
A rubber elastic body interposed between the inner cylinder member and the outer cylinder member;
On both sides along the axial direction, a first attachment portion and a second attachment portion that are attached to the vehicle body are provided, and a shaft member that penetrates the inner cylindrical member;
With
An axis of the shaft member is set to be inclined in a direction perpendicular to a force line direction applied to the trailing arm with respect to a virtual straight line connecting the center of the first mounting portion and the center of the second mounting portion. Suspension bush characterized by that. The suspension bush according to claim 1,
A suspension bush, wherein a resin body is interposed between the shaft member and the inner cylinder member. The suspension bush according to claim 1 or 2,
A suspension bush, wherein an axis of the shaft member and a line of force applied to the trailing arm are orthogonal to each other.

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