JP2020100186A - Toe correct bush and rear suspension device - Google Patents

Abstract

To provide a toe correct bush capable of easily assembling an attenuation mechanism and securing a holding strength of the attenuation mechanism.SOLUTION: A toe correct bush includes an inner cylinder 40, a cylindrical attenuation mechanism 50 surrounding the inner cylinder 40, a holding cylinder 10 surrounding the attenuation mechanism 50, an outer cylinder 20 surrounding the holding cylinder 10, and an outside elastic body 30 connecting the outer cylinder 20 and the holding cylinder 10, in which the attenuation mechanism 50 has an inside elastic body 80, a plurality of liquid chambers 2a and an orifice passage that communicates the plurality of liquid chambers 2a, the holding cylinder 10 has a bottom plate part 12 extending to an inside in a radial direction from the end on one side in the axial direction and a caulking part 13 that is positioned on the end in the other side in the axial direction and is caulked to the inside in the radial direction, the outer cylinder 20 has an opposite surface 21a that faces one side in the axial direction and faces a part of the vehicle body, and the opposite surface 21a is provided with a cushioning elastic body 9 that cushions impact of collision with the part of the vehicle body.SELECTED DRAWING: Figure 2

Description

The present invention relates to a toe collect bush and a rear suspension device.

A to collect bush provided at a connecting portion between a trailing arm of an automobile and a vehicle body is known. Patent Document 1 discloses a toe collect bush having a toe-collect mechanism that converts a lateral load of the vehicle during turning into a longitudinal direction of the vehicle to improve steering stability of the vehicle, and a liquid sealing structure provided inside the bush. Is disclosed. The liquid sealing structure functions as a damping mechanism that damps the vibration of the force converted in the vehicle front-rear direction.

JP, 2003-262249, A

The present inventors have conceived that the cost reduction can be achieved by using a common damping mechanism for various types of toe collection bushes. In this case, it is preferable that the structure part of the damping mechanism is configured to be independent of the other structure parts, and the preassembled damping mechanism is assembled to simplify the assembly structure. On the other hand, the to-collect bush may be subjected to a shocking stress, so that it is required to sufficiently secure the holding strength of the damping mechanism.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a toe collect bush capable of easily assembling a damping mechanism and ensuring the holding strength of the damping mechanism, and a rear suspension device including the toe collect bush. To do.

In order to solve the above problems, the present invention proposes the following means.
A toe collect bush according to the present invention is a toe collect bush that connects a trailing arm and a vehicle body, and includes an inner cylinder fixed to the vehicle body, and a tubular damping mechanism that surrounds the inner cylinder from the radially outer side. A holding cylinder that surrounds the damping mechanism from the outside in the radial direction, an outer cylinder that surrounds the holding cylinder from the outside in the radial direction and is fixed to the trailing arm, and an outer elastic body that connects the outer cylinder and the holding cylinder. The damping mechanism has an inner elastic body located between the inner cylinder and the holding cylinder in the radial direction, and the damping mechanism is filled with the liquid sealed by the inner elastic body. A plurality of liquid chambers arranged in line along the circumferential direction, and an orifice passage that communicates the plurality of liquid chambers with each other, and the holding cylinder has a tubular shape extending in the axial direction along the central axis of the inner cylinder. Of the holding cylinder body, a bottom plate portion extending inward in the radial direction from an end portion on one side in the axial direction of the holding cylinder body, and the damping mechanism located at the end portion on the other side in the axial direction of the holding cylinder body, A caulking portion that is crimped radially inward in a state of being inserted inside the main body, and the outer cylinder has a facing surface facing one side in the axial direction and facing a part of the vehicle body, A cushioning elastic body that cushions a shock of a collision with a part of the vehicle body is provided on the facing surface.

According to the above configuration, the damping mechanism is inserted into the holding cylinder and fixed by caulking. The inner elastic body of the damping mechanism does not stick to the holding cylinder. Therefore, according to the above configuration, the toe-collect bush can be assembled by inserting the preassembled damping mechanism into the holding cylinder. In a general toe collect bush, it is preferable to appropriately set the elastic coefficient and the like of the interposition portion according to the weight and acceleration performance of the vehicle body on which it is mounted. On the other hand, the configuration of the damping mechanism can be common to various vehicle bodies. According to the present embodiment, by adopting the structure in which the damping mechanism is inserted into the inside of the holding cylinder, the damping mechanism can be made common in the toe collect bushes of a wide variety of vehicle types having different configurations. As a result, the toe collect bush can be manufactured at low cost.
Further, according to the above configuration, the damping mechanism is held by the holding cylinder by caulking. Therefore, the step of fixing the damping mechanism to the holding cylinder becomes easy, and the manufacturing cost of the toe collect bush can be reduced.
Further, according to the above configuration, when the shock absorbing elastic body impacts the toe collect bush, the impact of collision between the facing surface and a part of the vehicle body is suppressed, and the damping mechanism separates from the holding cylinder. Can be suppressed.
Further, according to the above configuration, the bottom plate portion of the holding cylinder and the cushioning elastic body are both arranged on one side in the axial direction. Therefore, due to the impact force directed in the axial direction when the holding cylinder and the vehicle body collide with each other via the cushioning elastic body, a force for separating the damping mechanism from the holding cylinder is applied to the bottom plate portion. Since the caulking portion is formed by the caulking process, it has lower strength than the bottom plate portion. According to the present embodiment, even when a shock is applied, it is possible to suppress the impact force from being applied to the caulking portion, and it is possible to suppress the holding cylinder from coming off the damping mechanism.

In the toe collect bush described above, the outer elastic body has an interposition portion that connects the outer cylinder and the inner cylinder in a radial direction, and an axial position of the liquid chamber and an axial position of the interposition portion. However, the structure may be such that they overlap each other.

According to the above configuration, since the liquid chamber and the interposition portion overlap each other in the axial direction, the vibration of the holding cylinder due to the deformation of the outer elastic body can be suppressed in a well-balanced manner by the liquid chamber.

In the above described collect bush, the holding cylinder may be positioned inside both ends of the inner cylinder and the outer cylinder in the axial direction.

According to the above configuration, the holding cylinder is arranged inside both ends of the outer cylinder in the axial direction. For this reason, the radial displacement of the holding cylinder with respect to the outer cylinder can be stabilized, and the toe collection function can be enhanced.
Further, according to the above configuration, the holding cylinder is arranged inside both ends of the inner cylinder in the axial direction. Therefore, the radial displacement of the inner cylinder with respect to the holding cylinder can be stabilized, and the toe collection function can be enhanced.

The damping mechanism further includes an inner sheath portion into which the inner cylinder is fitted, and an outer sheath portion that surrounds the inner sheath portion from a radial outside, and the inner sheath portion and the outer sheath portion are Alternatively, the inner elastic body may be connected.

According to the above configuration, in the damping mechanism, the inner elastic body is supported by the inner sheath portion and the outer sheath portion. Therefore, the damping mechanism can be securely held by the inner cylinder in the inner sheath portion. Further, the damping mechanism can be securely held by the holding cylinder in the outer sheath portion. That is, according to the above configuration, the holding strength of the damping mechanism with respect to the inner cylinder and the holding cylinder can be increased.

The toe collect bush, the pair of left and right trailing arms that extend in the front-rear direction of the vehicle body and have tires attached to the rear portion thereof, and a torsion beam that connects the pair of left and right trailing arms to each other are provided. A rear suspension device, wherein the bush connects the trailing arm and the vehicle body in a state where the bush is inclined in the front-rear direction of the vehicle body as the central axis extends in the vehicle width direction.

According to the above configuration, it is possible to provide the rear suspension device using the toe collect bush having the above effects.

According to the present invention, it is possible to provide a toe collect bush capable of easily assembling the dampening mechanism and ensuring the holding strength of the dampening mechanism, and a rear suspension device including the toe collect bush.

FIG. 1 is a schematic diagram of a suspension device having a toe collect bush of the embodiment. FIG. 2 is a cross-sectional view of the toe collect bush. FIG. 3 is a cross-sectional view of the toe collect bush having a cross section different from that in FIG.

Hereinafter, the toe collect bush 1 of one embodiment of the vibration isolator according to the present invention will be described. In the drawings used in the following description, for the purpose of emphasizing the characteristic portion, the characteristic portion may be shown in an enlarged scale for convenience, and the dimensional ratios of the respective constituent elements are not necessarily the same as the actual ones. Absent. In addition, for the same purpose, there are cases where non-characteristic portions are omitted in the drawing.

FIG. 1 is a schematic diagram of a rear suspension device 5 having a toe collect bush 1 of this embodiment. In FIG. 1, the upper side in the figure is the front of the vehicle body. The rear suspension device 5 of this embodiment is mounted on a four-wheel vehicle.

The rear suspension device 5 extends in the front-rear direction and has a pair of left and right trailing arms 6 to which tires T are attached at the rear, a toe collect bush 1 that connects the trailing arms 6 to the vehicle body, and a pair of left and right trailing arms. And a torsion beam 7 connecting the six. The trailing arm 6 is connected to the toe collect bush 1 at the front end. Further, the trailing arm 6 rotatably supports the tire T at the rear end portion via the rear side support member 6a.

2 and 3 are cross-sectional views of the toe collect bush 1. In FIG. 2, the upper side in the figure is the front of the vehicle body. In FIG. 3, the upper side in the figure is the upper side of the vehicle body. In addition, in FIGS. 2 and 3, the left side in the drawings is the inside in the vehicle width direction, and the right side in the drawings is the outside in the vehicle width direction of the vehicle.

As shown in FIGS. 2 and 3, the toe collect bush 1 includes an inner cylinder 40 extending along the central axis J, a damping mechanism 50 that holds the inner cylinder 40, a holding cylinder 10 that holds the damping mechanism 50, An outer elastic body 30 arranged around the holding cylinder 10 and an outer cylinder 20 that holds the holding cylinder 10 via the outer elastic body 30 are provided.

The central axes of the inner cylinder 40, the damping mechanism 50, the holding cylinder 10 and the outer cylinder 20 are all arranged on the common central axis J. In this specification, the direction orthogonal to the central axis J is referred to as a radial direction in a plan view of the tough collect bush 1 as viewed in the axial direction, and the direction around the central axis J is referred to as a circumferential direction. A direction parallel to the central axis J is simply called an axial direction.

The inner cylinder 40 is fixed to the vehicle body. Both ends of the inner cylinder 40 in the axial direction respectively project outward from both ends of the outer cylinder 20 in the axial direction. The inner cylinder 40 is fixed to the vehicle body at both ends in the axial direction, for example.

The damping mechanism 50 has a tubular shape that surrounds the inner cylinder 40 from the outside in the radial direction. The damping mechanism 50 includes an inner sheath portion 60, an outer sheath portion 70, and an inner elastic body 80. That is, the toe collect bush 1 includes the inner sheath portion 60, the outer sheath portion 70, and the inner elastic body 80.

The inner sheath portion 60 has a tubular shape extending along the central axis J. The inner sheath portion 60 surrounds the inner cylinder 40 from the radially outer side. The inner sheath 40 is fitted with the inner cylinder 40 inside. Thereby, the damping mechanism 50 is fixed to the inner cylinder 40. According to this embodiment, since the damping mechanism 50 has the inner sheath portion 60, the inner sheath portion 60 can be reliably held by the inner cylinder 40.

The inner sheath portion 60 has a pair of base portions 61. The pair of base portions 61 are arranged side by side along the circumferential direction. As shown in FIG. 2, the base portion 61 is arranged in front of and behind the central axis J, respectively. The base portion 61 has a pair of partition portions 61a arranged along the axial direction. The block portion 81 of the inner elastic body 80 is arranged between the pair of partition portions 61a.

The outer sheath portion 70 surrounds the inner cylinder 40 and the inner sheath portion 60 from the outside in the radial direction. The outer sheath portion 70 has a tubular shape centered on the central axis J. As shown in FIG. 2, the outer sheath portion 70 is provided with a pair of windows 71. The pair of windows 71 are arranged along the circumferential direction. The window 71 is provided in front of and behind the central axis J, respectively. The pair of windows 71 are located substantially at the center of the outer sheath 70 in the axial direction.

A pair of concave grooves 72 extending in the circumferential direction is provided on the outer peripheral surface of the outer sheath portion 70. The concave grooves 72 are arranged on both axial sides of the window 71, respectively. A part of the inner elastic body 80 is filled in the groove 72. As will be described later, at least a part of the outer sheath portion 70 is embedded in the inner elastic body 80. Part of the inner elastic body 80 intrudes into the concave groove 72 of the outer sheath portion 70, so that the fixing strength between the outer sheath portion 70 and the inner elastic body 80 can be increased.

The outer peripheral surface of the outer sheath portion 70 is fitted to the inner peripheral surface of the holding cylinder 10 via a part of the inner elastic body 80. According to the present embodiment, since the damping mechanism 50 has the outer sheath portion 70, the damping mechanism 50 can be reliably held by the holding cylinder 10 in the outer sheath portion 70.

The inner elastic body 80 is made of rubber or elastomer resin. The inner elastic body 80 is located between the inner cylinder 40 and the holding cylinder 10 in the radial direction. The inner elastic body 80 is fixed to the outer peripheral surface of the inner sheath portion 60 facing outward in the radial direction. The outer sheath portion 70 is embedded in the inner elastic body 80. Thereby, the inner elastic body 80 connects the inner sheath portion 60 and the outer sheath portion 70.

The inner elastic body 80 has a pair of block portions 81. The block portion 81 is arranged between the pair of partition portions 61a of the inner sheath portion 60 in the axial direction. The block portion 81 is arranged inside the window portion 71 of the outer sheath portion 70.

As shown in FIGS. 2 and 3, the damping mechanism 50 is provided with a filling space 2 filled with the liquid L sealed by the inner elastic body 80. As the liquid L filled in the filling space 2, an incompressible liquid is adopted. Further, as the liquid L, it is preferable to employ a low-viscosity fluid in order to obtain sufficient damping characteristics for vibrations in the high frequency band.

The filling space 2 extends along the circumferential direction. The filling space 2 has a pair of liquid chambers 2a and a pair of orifice passages 2b. That is, the damping mechanism 50 is provided with a plurality of liquid chambers 2a and an orifice passage 2b that allows the plurality of liquid chambers 2a to communicate with each other. The liquid chambers 2a and the orifice passages 2b are alternately arranged along the circumferential direction. The orifice passage 2b connects the pair of liquid chambers 2a with each other.

As shown in FIG. 2, the liquid chamber 2 a is arranged inside the window portion 71 of the outer sheath portion 70. The liquid chamber 2 a is surrounded by the inner elastic body 80 and the holding cylinder 10. The inner wall of the liquid chamber 2a on both the radial direction side and the axial direction side is formed by the inner elastic body 80, and the outer side wall surface of the liquid chamber 2a is formed by the holding cylinder 10. Further, the orifice passages 2b are connected to both sides of the liquid chamber 2a in the circumferential direction.

As shown in FIG. 3, the orifice passage 2b is surrounded by the outer sheath portion 70, the inner elastic body 80, and the holding cylinder 10. The inner wall surface of the orifice passage 2b in the radial direction is formed by the outer sheath portion 70, the inner wall surfaces of the orifice passage 2b in the axial direction are formed by the inner elastic bodies 80, and the outer wall surface of the orifice passage 2b in the radial direction is formed by the holding cylinder 10. Composed.

In the present embodiment, the damping mechanism 50 is applied with vibration in the front-back direction from the holding cylinder 10. When the vibration in the front-rear direction is applied to the damping mechanism 50, the inner sheath portion 60 is displaced in the front-rear direction with respect to the outer sheath portion 70, and the inner elastic body 80 is deformed, so that the volume of the pair of liquid chambers 2a is increased. Change. As the volume of the pair of liquid chambers 2a changes, the liquid L in the pair of liquid chambers 2a moves to each other via the orifice passage 2b. The damping mechanism 50 promotes damping of vibration by the flow action of the liquid L.

In the present embodiment, the filling space 2 having the pair of liquid chambers 2a and the pair of orifice passages 2b connecting these liquid chambers 2a has been illustrated. However, the filling space 2 of the damping mechanism 50 is not limited to the present embodiment as long as the filling space 2 has a plurality of liquid chambers 2a arranged in the circumferential direction and an orifice passage 2b that allows the plurality of liquid chambers 2a to communicate with each other. ..

The holding cylinder 10 surrounds the damping mechanism 50 from the outside in the radial direction. A damping mechanism 50 is inserted and fixed inside the holding cylinder 10. The holding cylinder 10 is located inside both ends of the inner cylinder 40 in the axial direction. Similarly, the holding cylinder 10 is located inside both ends of the outer cylinder 20 in the axial direction. The holding barrel 10 has a tubular holding barrel main body 19 extending along the axial direction, and a bottom plate portion 12 and a caulking portion 13 respectively located on both axial sides of the holding barrel main body 19.

The bottom plate portion 12 extends radially inward from an end portion of the holding cylinder main body 19 on one axial side. The bottom plate portion 12 extends around the central axis J along the circumferential direction. The bottom plate portion 12 has a plate shape whose axial direction is the plate thickness direction. The bottom plate portion 12 comes into contact with the end surface of the outer sheath portion 70 that faces one side in the axial direction.

The caulking portion 13 is located at the end of the holding cylinder body 19 on the other axial side. The caulking portion 13 extends along the circumferential direction. The caulking portion 13 is formed by caulking radially inward with the damping mechanism 50 inserted in the holding cylinder body 19. The caulking portion 13 presses the end portion of the outer sheath portion 70 facing the other axial side from the other radial side. That is, the bottom plate portion 12 and the caulking portion 13 sandwich the damping mechanism 50 from both sides in the axial direction. As a result, the damping mechanism 50 is fixed to the holding cylinder 10. In the assembly process, the damping mechanism 50 is fixed to the holding cylinder 10 by being inserted into the holding cylinder 10 from the other side in the axial direction and forming the caulking portion 13 in a state of being in contact with the bottom plate portion 12.

The outer cylinder 20 surrounds the holding cylinder 10 from the outside in the radial direction. As shown in FIG. 1, the outer cylinder 20 is fixed to the trailing arm 6. The outer cylinder 20 is fixed to the tire T wheel via the trailing arm 6.

As shown in FIG. 2, the outer cylinder 20 has a cylindrical outer cylinder body 29 extending in the axial direction, and a flange portion 21 located on one axial side of the outer cylinder body 29. The flange portion 21 extends radially outward from an end portion of the outer cylinder body 29 on one axial side. The flange portion 21 extends in the circumferential direction around the central axis J. The flange portion 21 has a plate shape with the axial direction as the plate thickness direction.

The flange portion 21 has a facing surface 21a facing one side in the axial direction. That is, the outer cylinder 20 has the facing surface 21a. The facing surface 21a faces a part of a vehicle body (not shown) in the axial direction. A buffer elastic body 9 that is a part of the outer elastic body 30 is provided on the facing surface 21a.

The outer elastic body 30 is made of rubber or elastomer resin. The outer elastic body 30 includes a toe correct portion (intervening portion) 31 provided between the outer cylinder 20 and the holding cylinder 10 in the radial direction, and a cushioning elastic body 9 provided on the flange portion 21. The toe collect portion 31 and the buffer elastic body 9 are integrally molded.

The to-collect portion 31 is arranged between the inner peripheral surface of the outer cylinder 20 and the outer peripheral surface of the holding cylinder 10. The toe correct portion 31 overlaps the liquid chamber 2a of the damping mechanism 50 in the axial direction. The toe correct portion 31 is fixed to the inner peripheral surface of the outer cylinder 20 and the outer peripheral surface of the holding cylinder 10. That is, the outer elastic body 30 connects the outer cylinder 20 and the holding cylinder 10 in the toe correct portion 31. The to-collect portion 31 converts the axial force applied to the outer cylinder 20 in the front-rear direction of the vehicle body and transmits the force to the holding cylinder 10.

The cushioning elastic body 9 is provided on the facing surface 21 a facing the one axial side of the outer cylinder 20. The cushioning elastic body 9 faces a part of a vehicle body (not shown) via a gap. The cushioning elastic body 9 suppresses the impact of the collision between the facing surface 21a and a part of the vehicle body when the impact is applied to the toe collect bush 1.

As shown in FIG. 1, the toe collect bush 1 of the present embodiment connects the trailing arm 6 and the vehicle body in a state in which the central axis J is inclined in the front-rear direction of the vehicle body as it extends in the vehicle width direction. More specifically, in the to-collect bush 1 of the present embodiment, the central axis J is inclined forward as it goes inward in the vehicle width direction.

When a vehicle having such a torsion beam suspension mechanism receives an input in the vehicle left-right direction, such as cornering force, the holding cylinder 10 is deformed in the toe-collect portion 31 of the outer elastic body 30 to move in the front-back direction of the vehicle body. Moving. As the holding cylinder 10 moves in the front-rear direction of the vehicle body, the inner cylinder 40 also moves in the front-rear direction of the vehicle body, and the movement of the tire T can be controlled to improve steering stability and riding comfort. Further, the vibration of the holding cylinder 10 due to the movement in the front-rear direction is damped by the damping mechanism 50, so that the ride comfort of the operator is further improved.

According to the present embodiment, the damping mechanism 50 is inserted and fixed inside the holding cylinder 10. That is, in the present embodiment, the inner elastic body of the damping mechanism 50 does not adhere to the holding cylinder 10. Therefore, according to the present embodiment, the toe-collect bush 1 can be assembled by inserting the preassembled damping mechanism 50 into the holding cylinder 10. In a general toe collect bush, it is preferable to appropriately set the elastic coefficient and the like of the toe collect portion 31 in accordance with the weight and acceleration performance of the vehicle body to be mounted. On the other hand, the configuration of the damping mechanism 50 can be common to various vehicle bodies. According to the present embodiment, by adopting the structure in which the damping mechanism 50 is inserted inside the holding cylinder 10, the damping mechanism 50 can be shared by the toll-collect bushes 1 having different configurations. As a result, the toe collect bush 1 can be manufactured at low cost.

According to this embodiment, the outer elastic body 30 having the toe correct portion 31 and the inner elastic body 80 of the damping mechanism 50 are separately provided as separate bodies. For this reason, it is possible to individually design the material characteristics such as the elastic modulus and durability of the to-correct portion 31 that exhibits the to-correct function and the inner elastic body 80 that exhibits the damping function. As a result, it is possible to realize the optimum configurations for the to-correct portion 31 and the damping mechanism 50.

According to this embodiment, the damping mechanism 50 is arranged inside the holding cylinder 10. Therefore, a force converted in the front-rear direction of the vehicle body is applied to the damping mechanism 50 in the process of being transmitted from the outer cylinder to the holding cylinder 10. That is, according to the present embodiment, it is possible to suppress an axial force from being applied to the damping mechanism 50, and it is possible to enhance the durability of the inner elastic body 80 of the damping mechanism 50.

According to this embodiment, the damping mechanism 50 is fixed to the holding cylinder 10 by caulking. Therefore, the step of fixing the damping mechanism 50 to the holding cylinder 10 becomes easy, and the manufacturing cost of the toe collect bush 1 can be reduced.

In the present embodiment, the damping mechanism 50 is sandwiched by the bottom plate portion 12 and the caulking portion 13 from both sides in the axial direction. According to the present embodiment, the bottom plate portion 12 of the holding cylinder 10 and the buffer elastic body 9 are both arranged on one side in the axial direction. Therefore, due to the impact force directed in the axial direction when the holding cylinder 10 and the vehicle body collide with each other via the cushioning elastic body 9, the force for separating the damping mechanism 50 from the holding cylinder 10 is applied to the bottom plate portion 12. .. Since the caulking portion 13 is formed by the caulking process, the caulking portion 13 has lower strength than the bottom plate portion 12. According to the present embodiment, even when an impact is applied, it is possible to prevent the impact force from being applied to the caulking portion 13, and to prevent the holding cylinder 10 from being separated from the damping mechanism 50.

In the present embodiment, the axial position of the liquid chamber 2a and the axial position of the to-correct portion 31 overlap each other. Therefore, the vibration accompanying the deformation of the toe correct portion 31 is efficiently transmitted to the liquid chamber 2a of the damping mechanism 50, and the damping effect of the damping mechanism 50 can be enhanced.

In the present embodiment, the stress applied to the outer cylinder 20 is transmitted to the holding cylinder 10 via the deformation of the outer elastic body 30. Further, the holding cylinder 10 is located inside both ends of the outer cylinder 20 in the axial direction. Therefore, the displacement of the outer elastic body 30 becomes uniform along the axial direction, the radial displacement of the holding cylinder 10 with respect to the outer cylinder 20 can be stabilized, and the toe collect function of the toe collect bush 1 can be enhanced. it can.

In the present embodiment, the stress applied to the holding cylinder 10 is transmitted to the inner cylinder 40 via the deformation of the inner elastic body 80. In addition, the holding cylinder 10 is located inside both ends of the inner cylinder 40 in the axial direction. Therefore, the displacement of the inner elastic body 80 becomes uniform along the axial direction, the radial displacement of the inner cylinder 40 with respect to the holding cylinder 10 can be stabilized, and the toe collect function of the toe collect bush 1 can be enhanced. it can.

Although various embodiments of the present invention have been described above, each configuration and the combination thereof in each embodiment is an example, and addition, omission, substitution, and substitution of the configuration are within the scope not departing from the spirit of the present invention. Other changes are possible. The present invention is not limited to the embodiments.

DESCRIPTION OF SYMBOLS 1 Toe collect bush 2a Liquid chamber 2b Orifice passage 5 Rear suspension device 6 Trailing arm 7 Torsion beam 9 Buffer elastic body 10 Holding cylinder 12 Bottom plate part 13 Caulking part 19 Holding cylinder body 20 Outer cylinder 21a Opposed surface 30 Outer elastic body 31 Toecorrect Part (intervening part)
40 Inner cylinder 50 Damping mechanism 60 Inner sheath part 70 Outer sheath part 80 Inner elastic body J Central axis L Liquid T Tire

Claims (5)

A toe collect bush that connects the trailing arm and the vehicle body,
An inner cylinder fixed to the vehicle body,
A tubular damping mechanism that surrounds the inner cylinder from the radial outside,
A holding cylinder surrounding the damping mechanism from the outside in the radial direction,
An outer cylinder that surrounds the holding cylinder from the outside in the radial direction and is fixed to the trailing arm,
An outer elastic body that connects the outer cylinder and the holding cylinder,
The damping mechanism has an inner elastic body located between the inner cylinder and the holding cylinder in the radial direction,
The damping mechanism includes
A plurality of liquid chambers lined up in the circumferential direction filled with the liquid sealed by the inner elastic body,
An orifice passage that connects the plurality of liquid chambers to each other is provided,
The holding cylinder is
A tubular holding cylinder body extending in the axial direction along the central axis of the inner cylinder,
A bottom plate portion extending inward in the radial direction from an end portion on one axial side of the holding cylinder main body;
And a caulking portion that is located at an end portion on the other side in the axial direction of the holding barrel body and is crimped radially inward in a state where the damping mechanism is inserted inside the holding barrel body,
The outer cylinder has a facing surface facing one side in the axial direction and facing a part of the vehicle body,
The opposing surface is provided with a cushioning elastic body that cushions the impact of a collision with a part of the vehicle body,
To collect bush. The outer elastic body has an interposition portion that connects the outer cylinder and the inner cylinder in a radial direction,
An axial position of the liquid chamber and an axial position of the interposition part overlap each other,
The toe collect bush according to claim 1. The holding cylinder is located inside both ends of the inner cylinder and the outer cylinder in the axial direction.
The tough collect bush according to claim 1 or 2. The damping mechanism is
An inner sheath portion into which the inner cylinder is fitted,
An outer sheath portion that surrounds the inner sheath portion from the outside in the radial direction, and
The inner sheath portion and the outer sheath portion are connected by the inner elastic body,
The toe collect bush according to any one of claims 1 to 3. A toe collect bush according to any one of claims 1 to 4,
A pair of left and right trailing arms that extend in the front-rear direction of the vehicle body and that have tires attached to their rear portions;
A torsion beam connecting the pair of left and right trailing arms,
The toe collect bush connects the trailing arm and the vehicle body in a state in which the central axis is inclined in the front-rear direction of the vehicle body as it extends in the vehicle width direction,
Rear suspension system.

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