JP2022038078A - Support structure of elastic bush - Google Patents

Abstract

To provide a support structure of an elastic bush with enhanced reliability of a fastening portion, with a simple structure.SOLUTION: A support structure of an elastic bush 100 comprises: an elastic body 130, which is formed in a cylindrical shape and an outer peripheral surface portion of which is connected to a supporting object member 50; and a fastening member 120 held on an inner peripheral surface of the elastic body and fastened to a base portion 10. The fastening member is fixed to the base portion, by fastening of a protruding portion 121 protruding from an end face of the elastic body to a fastening object portion 14 formed in the base portion. A contact surface 123 contacting the fastened portion, of the protruding portion is formed as a convex surface such as a convex curved surface having an arc shape eccentric to a side opposite to the fastening object portion side with respect to a central axis when viewed from a central axis direction of the elastic body. A contact surface 15 contacting the protruding portion, of the fastening object portion is formed as a concave surface in surface contact with the convex surface of the protruding portion.SELECTED DRAWING: Figure 3

Description

The present invention relates to a support structure of an elastic bush that supports a supported member via an elastic body.

In the suspension of a vehicle such as an automobile, a vehicle body side member such as a vehicle body or a subframe and a wheel side member such as a hub bearing housing are connected to each other via a swingable suspension arm (link). is doing.
The joint between the suspension link and the vehicle body side member has an elastic material such as rubber for the purpose of suppressing vibration noise and obtaining compliance steer to obtain the desired wheel displacement by utilizing elastic deformation. An elastic bush is provided.

For example, Patent Document 1 describes a double wishbone rear suspension device that supports a rear wheel by using an upper arm, front and rear lower links, and a trailing link. Generally, elastic bushes are provided at one or both ends of such arms, links.
As a conventional technique relating to a support structure for attaching such an elastic bush to a vehicle body side member, for example, Patent Document 2 and Patent Document 3 describe a shaft-shaped member inserted into the inner diameter side of a cylindrical elastic bush. It is described that both ends are projected from an elastic body, and the protruding portions are fastened to a fastened portion provided on the vehicle body side by a mechanical fastening means such as a bolt.
Further, in Patent Document 4, a spherical washer and a hemispherical washer are slid in order to suppress a decrease in bolt fastening force due to aging in the vehicle body structure of an automobile in which a cabin and a side member are bolted via an insulator. It is described that it is used in a state where it can be contacted and rotated.

JP-A-2015-189339 International release WO2011 / 148893A1 Japanese Unexamined Patent Publication No. 2000-238662 JP-A-2007-22207

In a structure in which a protruding portion (ear portion) protruding from an elastic bush is fastened to a vehicle body side member as in Patent Documents 2 and 3, the fastening surface is applied by an external force input from a suspension link or the like while the vehicle is running. There is a concern that it will shift.
On the other hand, measures such as improving the fastening axial force of bolts, etc., or forming protrusions on the seat surface to increase the coefficient of friction may be taken, but the elastic bush provided on the suspension link may be used. Due to the assembly workability and suspension stroke (swing of the arm, etc.), the support part cannot always receive a load in the direction in which the fastening seat surface is compressed against external force, and is sufficiently resistant to fastening misalignment. It is difficult to have.
In addition, it is conceivable to expand the fastening seat surface in order to secure the bearing capacity against a large load applied to the surface of the fastening surface, but in the manufacturing process, it is necessary to pass the expanded fastening seat surface through the outer cylinder of the bush. Therefore, there is concern that it will lead to an increase in the size and weight of the entire bush.
In view of the above-mentioned problems, an object of the present invention is to provide a support structure for an elastic bush having improved reliability at a fastening portion by a simple structure.

The present invention solves the above-mentioned problems by the following solution means.
According to one aspect of the present invention, the support structure of the elastic bush is held on the inner peripheral surface of the elastic body and the elastic body formed in a tubular shape and to which the supported member is connected to the outer peripheral surface portion. It is a support structure of an elastic body bush having a fastening member to be fastened to a base portion, and the fastening member has a protruding portion protruding from an end face of the elastic body to be fastened to a fastened portion formed on the base portion. The contact surface of the protrusion with the protrusion is formed as a convex surface, and the contact surface of the protrusion with the protrusion is in surface contact with the convex surface of the protrusion. It is characterized by being formed on a concave surface.
According to this, by making the contact surface of the protruding portion with the fastened portion a convex surface, an external force input from the supported member along the radial direction of the elastic body (as an example, acts as an axial force of the suspension link). The tensile force or compressive force to be applied) can be received in a state where a normal force between the contact surfaces is generated in a wide input angle range.
For this reason, while suppressing the displacement of the contact surface due to external force, for example, when fastening with bolts, the bending force to the bolt is reduced to prevent bending deformation of the bolt and buckling of the bolt bearing surface, and the fastening location. The reliability of the can be improved.
Further, it is possible to suppress the expansion of the fastening surface and the expansion of the bolt diameter for improving the yield strength when the external force is large, and it is possible to reduce the size and weight of the support structure of the elastic bush.

Further, in the present invention, the convex surface is formed into a convex curved surface having an arc shape eccentric to the side opposite to the fastened portion side with respect to the central axis when viewed from the central axis direction of the elastic body. The concave surface of the fastened portion may be formed on a concave curved surface that is in surface contact with the convex surface of the protruding portion.
According to this, the above-mentioned effect can be obtained by a simple configuration.

Further, in the present invention, the supported member is a swinging member that swings within a predetermined angle range around the central axis of the elastic body, and the swinging member when viewed from the central axis direction of the elastic body. When the moving member is within the angle range, a straight line that is in the same direction as the input direction from the swinging member to the elastic body and passes through the center of action of the input intersects the convex surface of the protruding portion. can do.
According to this, when the force acting in the axial direction of the rocking member is input to the elastic body bush as an external force, this input is applied to the convex curved surface portion of the protruding portion of the fastening member and the concave curved surface portion of the fastened portion. It can be received in a state where a normal force is surely generated between the contact surfaces, and it is possible to surely prevent the contact surfaces from shifting and deformation of bolts and the like due to external force, and to improve the reliability of the fastening portion.
In this case, the straight line may be configured to intersect the convex surface at two points.
According to this, the above-mentioned effect can be obtained regardless of whether the axial force input from the member to be fastened is in the compression direction or the tensile direction, and the reliability of the fastened portion can be more reliably improved. ..

As described above, according to the present invention, it is possible to provide a support structure for an elastic bush with improved reliability at a fastening portion by a simple structure.

It is a schematic external perspective view of the suspension apparatus which has the embodiment of the support structure of the elastic body bush to which this invention was applied. It is a figure which shows the structure of the elastic body bush in an embodiment. It is a schematic cross-sectional view of the fastening part of the elastic body bush and a subframe in an embodiment. It is a figure which shows the structure of the elastic body bush which is a comparative example of this invention.

Hereinafter, embodiments of a support structure for an elastic bush to which the present invention is applied will be described.
The support structure of the elastic bush of the embodiment is provided in a double wishbone suspension for the rear wheels of an automobile such as a four-wheeled passenger car.
FIG. 1 is a schematic external perspective view of a suspension device having a support structure for an elastic bush according to an embodiment.

The suspension device 1 includes a subframe 10, a housing 20, a front lateral link 30, a rear lateral link 40, an upper link 50, a trailing link 60, a damper unit 70, a stabilizer device 80, and the like.
Unless otherwise specified, the suspension device 1 has a substantially symmetrical configuration.

The subframe 10 is a structural member (vehicle body side member) that is a base to which each link of the suspension device 1 is attached, and is attached under the rear floor of the vehicle body body (not shown) via a subframe bush having anti-vibration rubber. ing.
The subframe 10 includes a front member 11, a rear member 12, a side member 13, and the like.
The front member 11 is a beam-shaped member provided at the front end portion of the subframe 10 and arranged substantially along the vehicle width direction.
Both ends of the front member 11 are attached to the vehicle body via a subframe bush.
The rear member 12 is a beam-shaped member provided at the rear end of the subframe 10 and arranged substantially along the vehicle width direction.
Both ends of the rear member 12 are attached to the vehicle body via a subframe bush.
The side member 13 is a beam-shaped member that connects a portion near the side end portion of the front member 11 and a portion near the side end portion of the rear member 12 substantially along the front-rear direction of the vehicle.
A pair of left and right side members 13 are provided apart from each other in the vehicle width direction.
The side member 13 is provided with a bracket 14 which is a fastened portion to which a rubber bush 100 that swingably supports the upper link 50 is fastened.
The bracket 14 cooperates with the rubber bush 100 to form a support structure for the elastic bush of the present embodiment.
The detailed configuration of the fastening portion (not shown in FIG. 1, see FIG. 3) in the bracket 14 will be described in detail later.

The housing 20 is a member (hub bearing housing, hub knuckle) that accommodates a hub bearing that rotatably supports a hub to which wheels are mounted.
The suspension device 1 supports the housing 20 with respect to the subframe 10 so as to be able to stroke (vertically displace with respect to the vehicle body) in the vertical direction along a predetermined trajectory defined by the suspension geometry.

The front lateral link 30 and the rear lateral link 40 are provided between the lower portion of the side member 13 and the lower portion of the housing 20.
The front lateral link 30 and the rear lateral link 40 are arranged substantially along the vehicle width direction and separated from each other in the front-rear direction of the vehicle.
Both ends of the front lateral link 30 and the rear lateral link 40 are swingably connected to the side member 13 and the housing 20 via vibration-proof rubber bushes, respectively.

The upper link 50 is provided between the bracket 14 provided on the upper part of the side member 13 and the upper part of the housing 20.
The upper link 50 is arranged substantially along the vehicle width direction.
Both ends of the upper link 50 are swingably connected to the side member 13 and the housing 20 via a rubber bush for vibration isolation and a ball joint, respectively.
The rubber bush 100 provided at the end of the upper link 50 on the side member 13 side is an elastic bush to which the support structure of the present embodiment is applied.
The rubber bush 100 is a cylindrical bush having a central axis substantially along the front-rear direction of the vehicle.
The rubber bushes 100 are provided with a pair, for example, separated from each other in the front-rear direction.
The detailed configuration of the rubber bush 100 and the fastening portion with the bracket 14 will be described in detail later.

The trailing link 60 is provided between the vicinity of the side end portion of the front member 11 and the lower portion of the housing 20.
The trailing link 60 is arranged substantially along the vehicle front-rear direction.
Both ends of the trailing link 60 are swingably connected to the front member 11 and the housing 20 via vibration-proof rubber bushes, respectively.

The damper unit 70 is a unitized damper that generates a damping force according to the expansion / contraction speed and a coil spring (suspension spring) that generates a spring reaction force according to the expansion / contraction amount.
The upper end of the damper unit 70 is attached to a vehicle body (not shown) via a top mount having anti-vibration rubber.
The lower end portion 71 of the damper unit 70 is attached to the intermediate portion of the rear lateral link 40.
The lower end portion 71 is connected to the rear lateral link 40 via, for example, a ball joint (spherical bearing).

The stabilizer device 80 is an anti-roll device that generates a spring reaction force in a direction that reduces the difference between the left and right strokes when strokes in opposite directions (opposite phases) occur on the left and right sides of the suspension device 1.
In the stabilizer device 80, both ends of the stabilizer bar, which is formed of spring steel and whose intermediate portion is arranged substantially along the vehicle width direction, are connected to the left and right rear lateral links 40 via links.

Hereinafter, the rubber bush 100, which is an elastic bush, provided at the connecting portion between the inner end portion of the upper link 50 in the vehicle width direction and the bracket 14 provided on the side member 13 of the subframe 10 will be described.
FIG. 2 is a diagram showing the configuration of the elastic bush in the embodiment.
FIG. 2A is a cross-sectional view of the rubber bush 100, which is the elastic body bush of the embodiment, cut along a plane including the central axis of the elastic body 130, and FIG. 2B is FIG. 2A. It is a cross-sectional view of the bb part of).
FIG. 3 is a schematic cross-sectional view of a fastening portion between the elastic bush and the subframe in the embodiment.
FIG. 3 shows a cross section cut along a plane including the central axis of the bolt B and orthogonal to the central axis of the shaft 120. In FIG. 3, the right side shows the outside in the vehicle width direction.

The rubber bush 100 includes an outer cylinder 110, a shaft 120, an elastic body 130, and the like.
The outer cylinder 110 is formed in a cylindrical shape with a material having a high hardness with respect to the material of the elastic body 130 such as steel.
The outer peripheral surface portion of the outer cylinder 110 is fixed to the inner diameter side of the cylindrical portion formed on the upper link 50, which is a supported member, by, for example, press fitting.

The shaft 120 is a shaft-shaped member inserted into the inner diameter side of the outer cylinder 110.
The shaft 120 is a fastening member that is fastened to the bracket 14 of the subframe 10 provided on the vehicle body side.
The shaft 120 is made of a material having a high hardness with respect to an elastic body 130 such as steel.
The main body of the shaft 120 is formed in a columnar shape, and is arranged so as to be held concentrically with the outer cylinder 110 by the elastic body 130 in a no-load state (when no external force is input).

The shaft 120 has a protruding portion 121, a bolt bearing surface portion 122, a convex curved surface portion 123, a bolt hole 124, and the like.
The protruding portions 121 are portions (so-called ear portions) provided at both ends of the shaft 120 in the longitudinal direction (axial direction) and protruding from the end faces on both sides of the elastic body 130.
The protrusion 121 is fastened to the bracket 14 formed on the side member 13 of the subframe 10 by a mechanical fastening means (bolt B as an example in this embodiment).
In the embodiment, the protrusion 121 is attached to the bracket 14 from above in the vehicle-mounted state.

The bolt bearing surface portion 122 is a surface portion formed on a portion of the protruding portion 121 opposite to the bracket 14 side (for example, upward in the case of the embodiment).
The bolt bearing surface portion 122 is formed along a plane orthogonal to the axis of the bolt hole 124.
The bolt bearing surface portion 122 is a portion that abuts the protruding portion 121 with the washer portion of the bolt B with a washer (see FIG. 3) that fastens the protruding portion 121 to the bracket 14, and transmits the fastening load of the bolt B to the protruding portion 121.

The convex curved surface portion 123 is a surface portion formed on the bracket 14 side (lower in the case of the embodiment) of the protruding portion 121, and is unavoidable due to the concave curved surface portion 15 formed on the bracket 14 and the processing accuracy and the like. It is a part that comes into surface contact with the exception of the gap that occurs.
The convex curved surface portion 123 is formed as an arcuate convex curved surface in which the bracket 14 side (lower surface side in FIGS. 2 and 3) is convex when viewed from the central axis direction of the shaft 120.
The center of this arc shape in the convex curved surface portion 123 is offset to the side opposite to the bracket 14 side (upper side in FIGS. 2 and 3) with respect to the central axes of the shaft 120 and the outer cylinder 110. It is arranged eccentrically.
Further, the radius of this arc can be made substantially the same as the radius of the main body of the shaft 120, for example.
With the above configuration, the protruding portion 121 has a substantially semicircular or D-shaped shape when viewed from the axial direction of the shaft 120.

The bolt hole 124 is for inserting a bolt B (see FIG. 3), which is a mechanical fastening means for fastening the protrusion 121 to the bracket 14.
The bolt hole 124 is a circular through hole having a central axis along the normal direction of the bolt bearing surface portion 122.
The bolt holes 124 are arranged so that the central axial direction is substantially along the vertical direction when the rubber bush 100 is attached to the vehicle.

The elastic body 130 is provided between the inner peripheral surface of the outer cylinder 110 and the outer peripheral surface of the main body of the shaft 120 by using a flexible elastic material such as a rubber-based material.
The inner peripheral surface of the outer cylinder 110 and the outer peripheral surface of the shaft 120 are each joined to the elastic body 130 by vulcanization adhesion or the like.
In the example shown in FIG. 2, the elastic body 130 has a solid structure that is uniform in both the axial direction and the circumferential direction, but in order to adjust the rigidity, a space portion (partially as appropriate) is provided. A rigid member (insert) may be provided with respect to the material of the elastic body 130 body.
A supported member and an upper link 50, which is a swinging member, are connected to the outer peripheral surface of the elastic body 130 via an outer cylinder 110.

As shown in FIG. 3, the bracket 14 is formed with a concave curved surface portion 15 and a bolt hole 16 as a to be fastened portion to which the rubber bush 100 is fastened.
The concave curved surface portion 15 is formed as a concave curved surface having substantially the same curvature as the convex curved surface portion 123 so as to make surface contact with the convex curved surface portion 123 of the shaft 120.
The bolt hole 16 is a portion where the tip end portion of the bolt B inserted through the bolt hole 124 of the shaft 120 is inserted and fastened.
A female screw portion that is screw-coupled to the bolt B and generates a bolt axial force is formed on the inner peripheral surface portion of the bolt hole 16.

The convex curved surface portion 123 and the concave curved surface portion 15 described above are configured to be able to receive at least a part of the load input from the upper link 50 in a state of generating a normal force when the vehicle is traveling. There is.
This point will be described in detail below.
The external force input from the upper link 50 to the outer cylinder 110 of the rubber bush 100 when the vehicle is traveling is dominated by the tensile force or the compressive force acting as the axial force on the upper link 50.
Here, the axial force of the upper link 50 is the swing center on the subframe 10 side (vehicle body side) and the swing on the housing 20 side when viewed from the front-rear direction of the vehicle (the central axis direction of the rubber bush 100). It shall mean the tensile force or compressive force acting along the straight line connecting the moving center.
The swing center on the subframe 10 side is the elastic center of the elastic body 130, and in the case of the present embodiment, substantially coincides with the central axes of the outer cylinder 110 and the elastic body 130.

The suspension device 1 strokes the housing 20 so as to move up and down relative to the subframe 10 while the vehicle is running, as shown by the broken line arrow in FIG.
In FIG. 3, the direction of action of the axial force of the upper link 50 when the suspension device 1 strokes to the most rebound side (extension side) is shown by a straight line L1, and the upper link 50 when the suspension device 1 strokes to the bump side (contraction side) most. The direction of action of the axial force of is indicated by a straight line L2.
The straight lines L1 and L2 are shown as straight lines passing through the center of action of each axial force.
Depending on the stroke of the suspension device 1, the input direction from the upper link 50 to the rubber bush 100 changes within the angle range θ between the straight lines L1 and L2.
Each axial force may be a tensile force or a compressive force, depending on the suspension geometry and the input to the tire contact point (ground load, cornering force, cornering force, etc.).

In the embodiment, at least a part of the tensile force and the compressive force in the direction along the straight line L1 is perpendicular to the regions R1 and R2 in the contact surface portion between the convex curved surface portion 123 of the shaft 120 and the concave curved surface portion 15 of the bracket 14. It can be received as a resistance.
Further, at least a part of the tensile force and the compressive force in the direction along the straight line L2 can be received as a normal force in the regions R3 and R4 in the contact surface portion described above.
The regions R1 to R4 include a portion where the straight line L1 or L2 intersects the convex curved surface portion 123 and the concave curved surface portion 15 when viewed from the central axis direction of the elastic body 130, and the axial force of the upper link 50 is the surface pressure. It is an area that acts as.
Even if the stroke amount of the suspension device 1 is in the intermediate region between the most rebound side and the most bump side, the direction of action of the axial force of the upper link 50 when viewed from the central axis direction of the elastic body 130 is the convex curved surface portion. It is designed to intersect with 123 and the concave curved surface portion 15.
The curvature of the convex curved surface portion 123, the central angle of the arc shape when viewed from the central axis direction of the elastic body 130, and the like are set so as to satisfy the above-mentioned conditions.

The effects of the present embodiment will be described in comparison with the comparative examples of the present invention described below.
In the comparative example, the parts common to the embodiments are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described.
FIG. 4 is a diagram showing the configuration of the elastic bush in the comparative example.
FIG. 4 (a) is a cross-sectional view of the rubber bush 100A, which is an elastic body bush of the comparative example, cut along a plane including the central axis, and FIG. 4 (b) is a cross-sectional view taken along the line of FIG. 4 (a). It is a cross-sectional view of part b.
The rubber bush 100A of the comparative example has a flat surface portion 125 described below in place of the convex curved surface portion 123 of the rubber bush 100 of the embodiment.
The flat surface portion 125 is a surface portion that comes into contact with the bracket 14, and is formed as a flat surface parallel to the bolt bearing surface portion 122.
The flat surface portion 125 is fastened by bolts B in a state of being in surface contact with a flat surface portion (not shown) formed on the bracket 14.
In the above-mentioned comparative example, when an external force (axial force) acts on the rubber bush 100A from the upper link 50 along the direction of the straight lines L1 and L2 or the middle direction of the straight lines L1 and L2, the external force is flat. The portion 125 acts in a direction of shifting in the plane direction with respect to the flat surface portion of the bracket 14, and so-called fastening misalignment may occur.
Further, when such a fastening deviation occurs, bending deformation occurs in the bolt B, and further deformation of the bolt bearing surface portion 122 may be induced.

On the other hand, in the present embodiment, the axial force (tensile force, compressive force) of the upper link 50 is crimped with a normal force at a part of the contact surface between the convex curved surface portion 123 and the concave curved surface portion 15. Since the protrusion 121 is restrained with respect to the bracket 14, the fastening misalignment is prevented.
Therefore, it is possible to prevent bending deformation of the bolt B and deformation of the bolt bearing surface portion 122 accompanying the bending deformation.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The contact surface of the protruding portion 121 with the bracket 14 is a convex curved surface portion 123 having an arc shape eccentric to the side (upper side) opposite to the bracket 14 side with respect to the central axis of the elastic body 130. An external force (tensile force or compressive force) input from the upper link 50 along the radial direction of the elastic body 130 can be received in a state of generating a normal force between the contact surfaces in a wide input angle range.
Therefore, while suppressing the displacement of the contact surface due to the external force, the bending force to the bolt B is reduced, the bending deformation of the bolt B and the buckling of the bolt bearing surface portion 122 are prevented, and the reliability of the fastening portion is improved. can do.
Further, it is possible to suppress the expansion of the fastening surface and the expansion of the bolt diameter for improving the yield strength when the external force is large, and it is possible to reduce the size and weight of the support structure of the elastic bush.
(2) When the upper link 50 is within a predetermined swing angle range θ when viewed from the central axis direction of the elastic body 130, the same direction as the axial force direction input from the upper link 50 to the elastic body 130. The axial force of the upper link 50 is increased by the configuration that the straight lines L1 and L2 passing through the center of action of the axial force or the straight line in the angle range between them intersects the convex curved surface portion 123 of the protruding portion 121. When an external force is input to the rubber bush 100, a normal force is reliably generated between the contact surface between the convex curved surface portion 123 of the protruding portion 121 of the shaft 120 and the concave curved surface portion 15 of the bracket 14. It is possible to prevent the contact surface from shifting and the bolt B from being deformed due to an external force, and to improve the reliability of the fastening portion.
(3) The above-mentioned straight lines L1, L2 and the like intersect with the convex curved surface portion 123 at two points, so that the axial force input from the upper link 50 is described above regardless of whether the axial force is in the compression direction or the tension direction. The effect can be obtained, and the reliability of the fastening portion can be improved more reliably.

(Modification example)
The present invention is not limited to the embodiments described above, and various modifications and changes can be made, and these are also within the technical scope of the present invention.
(1) The structure of the support structure of the elastic bush is not limited to the above-described embodiment, and can be appropriately changed.
For example, the shape, structure, material, arrangement, quantity, etc. of each component can be changed as appropriate.
(2) In the embodiment, the support structure of the elastic bush is provided, for example, at the vehicle body side (subframe side) end of the upper link of the double wishbone rear suspension, but the present invention has a front surface. It can be applied to other suspension devices including suspensions, and the type of link (arm) to which the application is applied is not particularly limited.
(3) The present invention can be applied not only to the so-called suspension bush provided at the end of the link (arm) in the suspension device, but also to the elastic bush provided at another portion.
For example, the present invention may be applied to an engine mount, a transmission mount, a differential mount, a subframe bush, and the like.
(4) In the embodiment, the convex curved surface portion and the concave curved surface portion have an arcuate cross-sectional shape when viewed from the central axis direction of the elastic body, but the present invention is not limited to this, and for example, an ellipse, an ellipse, or the like. It may be formed as a curved surface having another shape such as an arc or a parabolic shape.
Further, instead of such a convex curved surface or a concave curved surface, for example, a convex surface or a concave surface formed by combining a plurality of planes may be used.
(5) In the embodiment, the material of the elastic body is, for example, a rubber-based material, but the material is not limited to this, and other materials having elasticity and flexibility may be used.
For example, a urethane-based material or the like may be used.

1 Suspension device 10 Subframe 11 Front member 12 Rear member 13 Side member 14 Bracket 15 Concave curved surface 16 Bolt hole 20 Housing 30 Front lateral link 40 Rear lateral link 50 Upper link 60 Trailing link 70 Damper unit 80 Stabilizer device 100 Rubber bush Embodiment) 100A rubber bush (comparative example)
110 Outer cylinder 120 Shaft 121 Protruding part 122 Bolt bearing surface part 123 Convex curved surface part 124 Bolt hole 125 Flat part 130 Elastic body B Bolt L1 Direction of action of input from upper link (during rebound)
Direction of action of input from L2 upper link (at the time of bump)
R1 to R4 Area where the input direction and the contact surface intersect

Claims (4)

An elastic body that is formed in a cylindrical shape and has a supported member connected to the outer peripheral surface.
It is a support structure of an elastic body bush having a fastening member held on the inner peripheral surface of the elastic body and fastened to the base.
The fastening member is fixed to the base portion by fastening the protruding portion protruding from the end face of the elastic body to the fastened portion formed on the base portion.
The contact surface of the protruding portion with the fastened portion is formed as a convex surface.
A support structure for an elastic bush, wherein the contact surface of the projected portion with the protruding portion is formed as a concave surface in surface contact with the convex surface of the protruding portion. The convex surface is formed into an arcuate convex curved surface that is eccentric to the side opposite to the fastened portion side with respect to the central axis when viewed from the central axis direction of the elastic body.
The support structure for an elastic bush according to claim 1, wherein the concave surface of the fastened portion is formed on a concave curved surface that is in surface contact with the convex surface of the protruding portion. The supported member is a swinging member that swings within a predetermined angle range around the central axis of the elastic body.
When the swinging member is within the angle range when viewed from the central axis direction of the elastic body, the direction of input from the swinging member to the elastic body is the same and the center of action of the input is set. The support structure for an elastic bush according to claim 1 or 2, wherein a straight line passing through intersects the convex surface of the protrusion. The support structure for an elastic bush according to claim 3, wherein the straight line intersects the convex surface at two points.

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