KR20110139609A

KR20110139609A - Lower arm bush unit for vehicle

Info

Publication number: KR20110139609A
Application number: KR1020100059779A
Authority: KR
Inventors: 이종우
Original assignee: 현대자동차주식회사
Priority date: 2010-06-23
Filing date: 2010-06-23
Publication date: 2011-12-29

Abstract

PURPOSE: A lower arm bush unit for a vehicle is provided to improve the ride comfort of a vehicle by maximizing strength to a horizontal load and minimizing strength to a vertical load. CONSTITUTION: A lower arm bush unit for a vehicle comprises an outer pipe(10), an inner pipe(30), and an insulator(50). The inner pipe is arranged inside the outer pipe. The insulator is attached on the outer pipe of the inner pipe and the inner surface of the outer pipe. Operation holes(51) are formed in both sides of the insulator. Inner protrusions(61) are formed in both sides of the outer surface of the inner pipe. Outer protrusions(71) corresponding to the inner protrusions are formed on the inner surface of the outer pipe.

Description

Lower Arm Bush Unit for Vehicle {LOWER ARM BUSH UNIT FOR VEHICLE}

An exemplary embodiment of the present invention relates to a suspension device for a vehicle, and more particularly, to a vehicle lower arm bush unit for mounting a lower arm on members of a vehicle body.

In general, the suspension of the vehicle is an important device for achieving ride comfort and running stability, and mainly serves to stably support the vehicle body from the wheel while suppressing or rapidly reducing the vibration provided from the wheel.

A lower arm is used for the suspension device to connect and support the wheel to the vehicle body, and the lower arm is equipped with a bushing unit to mitigate vibrations and shocks generated from irregular road surfaces so that the vibration transmission characteristics of the vehicle or It plays a very important role in improving ride comfort and maneuvering stability.

That is, the bush unit absorbs the impact force by supporting the lateral force, the front and rear force, and the vertical force coming in through the tire while driving, thereby preventing the abnormal behavior of the tire.

As shown in FIGS. 3 and 4, a vehicle suspension according to an example of the related art has lower arms 3 mounted at both front and rear ends of the subframe 1, and the lower arms 3 are knuckle arms 4. ).

Here, the lower arm 3 is connected to both front sides of the subframe 1 via the front bush 5 (commonly known as "A bush" in the art), and the rear bush 9 (in the art) Typically connected to both rear sides of the subframe 1 via a " G bush "

In this case, the rear bush 9 includes an outer pipe 110 forming an outer cylinder and an inner pipe 130 forming an inner cylinder, and an insulator 150 between the outer pipe 110 and the inner pipe 130. Is interposed.

When the front and rear force generated through the tire of the vehicle is generated on the insulator 150, an action hole 151 is formed to secure the front and rear compliance of the vehicle.

The action hole 151 absorbs the impact load due to the longitudinal force and the lateral force by inducing the deformation of the insulator 150 when the inner pipe 130 flows in response to the longitudinal force and the lateral force generated during the driving of the vehicle. .

However, in the related art, in response to the front and rear forces and the lateral forces generated during the driving of the vehicle, there is a problem in that it does not satisfy the required characteristics for each direction of the front and rear and lateral loads, thereby lowering the ride comfort and handling characteristics of the vehicle.

That is, in the related art, when the front and rear force acts while driving the vehicle, deformation of the insulator 150 occurs largely, so that the impact force in the front and rear directions can be sufficiently absorbed while the rigidity of the front and rear directions is minimized.

However, when the lateral force acts while driving the vehicle, since the deformation of the insulator 150 may occur greatly as described above, the rigidity against the lateral load is degraded, and as a result, the handling characteristics due to the turning driving of the vehicle are deteriorated. Can be dropped.

Exemplary embodiments of the present invention have been created to improve the above problems, and the radial stiffness to satisfy the required characteristics of the front and rear and lateral load direction corresponding to the front and rear forces and the lateral force acting on the lower arm It provides a vehicle lower arm bushing unit to change the.

To this end, the vehicle lower arm bushing unit according to the exemplary embodiment of the present invention is mounted to one end of the lower arm so as to mount the lower arm of the suspension device on members of the vehicle body, i) an outer pipe, and ii An inner pipe disposed inside the outer pipe, and ⅲ) an insulator adhered to the outer circumferential surface of the inner pipe and the inner circumferential surface of the outer pipe between the outer pipe and the inner pipe, wherein the insulator is centered on the inner pipe. Action holes are formed on both sides, and the inner convex portions protrude from both sides of the outer circumferential surface of the inner pipe, and the outer convex portions protrude from the inner circumferential surface side of the outer pipe in correspondence to the respective inner convex portions.

In the vehicle lower arm bush unit, the outer convex portion may be formed as a stopper protrusion in which a stop is made by the inner convex portion.

In the vehicle lower arm bush unit, the outer convex portion may protrude from an inner circumferential surface side of the outer pipe from the upper side of each inner convex portion.

In the vehicle lower arm bush unit, the inner convex portion and the outer convex portion may be formed on the inner circumferential surface of each of the action holes.

According to the vehicle lower arm bush unit according to the exemplary embodiment of the present invention as described above, by forming the inner and outer convex portions in the insulator, the front and rear and lateral loads are generated in response to the front and rear forces and the lateral forces generated while driving the vehicle. It can satisfy the required characteristic for each direction.

Therefore, in this embodiment, the rigidity with respect to the lateral load can be increased, and the ride comfort and handling characteristics of the vehicle can be improved by minimizing the rigidity with respect to the front-rear load.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a cross-sectional view showing a lower arm bush unit for a vehicle according to an exemplary embodiment of the present invention.
2A to 2C are views for explaining the operation of the lower arm bush unit for a vehicle according to an exemplary embodiment of the present invention.
3 is a perspective view showing a vehicle suspension according to an example of the prior art.
4 is a view showing examples of a vehicle lower arm bush unit according to the prior art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings, and is shown by enlarging the thickness in order to clearly express various parts and regions. It was.

1 is a cross-sectional view showing a lower arm bush unit for a vehicle according to an exemplary embodiment of the present invention.

Referring to the drawings, the vehicle lower arm bushing unit 100 according to an exemplary embodiment of the present invention may be applied to a front suspension of a vehicle, for example, a McPherson type suspension of a vehicle.

Here, the suspension arm is equipped with a lower arm 3 at both front and rear ends of the subframe 1 (see FIG. 3 below), and the lower arm 3 is connected to the knuckle arm 4 (see FIG. 3 below). .

In this case, the lower arm 3 is connected to both front sides of the sub-frame 1 through the front bush 5 (commonly known as "A bush" in the art), and the bush unit according to the present embodiment ( 100) (commonly known in the art as "G bush") to both rear sides of the subframe 1.

The bush unit 100 according to the present embodiment is required for each direction of the front and rear and lateral loads in response to the front and rear forces and the lateral forces applied to the lower arm 3 during wheel impact and turning during the driving of the vehicle. It has a structure that can change the radial stiffness to satisfy.

To this end, the vehicle lower arm bushing unit 100 according to the exemplary embodiment of the present invention basically includes an outer pipe 10, an inner pipe 30, and an insulator 50. The pipe 10 forms an outer cylinder, and its outer circumferential surface is fixedly mounted to one end of the lower arm 3.

In addition, the inner pipe 30 is disposed inside the outer pipe 10, and the insulator 50 is a rubber material between the outer circumferential surface of the inner pipe 30 and the outer pipe between the outer pipe 10 and the inner pipe 30. It is vulcanized and bonded to the inner peripheral surface of the pipe 10.

In this case, the insulator 50 is formed on both sides of the inner pipe 30 so as to have lateral symmetry holes 51 (commonly referred to in the art as "VOID") on both sides thereof so as to be symmetrical and vertically asymmetrical. .

In the present embodiment, the insulator 50 has protrusions 61 formed in the form of protrusions on both sides of the outer circumferential surface of the inner pipe 30, and correspond to the inner circumferential portions 61 of the outer pipe 10. Protruding outer convex portion 71 is formed on the side.

In the above, the outer convex portion 71 is formed as a stopper protrusion 72 which stops by each inner convex portion 61, and protrudes toward the inner circumferential surface side of the outer pipe 10 from the upper side of each inner convex portion 61. Is formed.

In this case, the inner convex portion 61 and the outer convex portion 71 are also commonly referred to in the art as "bridges", and are formed to protrude on the inner circumferential surface of each of the operation holes 51 mentioned above.

Hereinafter, with reference to the accompanying drawings the operation of the vehicle lower arm bushing unit 100 according to an exemplary embodiment of the present invention configured as described above will be described in detail.

2A to 2C are views for explaining the operation of the lower arm bush unit for a vehicle according to an exemplary embodiment of the present invention.

Referring to FIG. 2A, first, in the present embodiment, when an impact is applied from the front side as an example of driving of the vehicle, the lower arm 3 is a front view of the front bush 5 in the drawing due to the impact load input from the vehicle. Direction, the insulator 50 of the bushing unit 100 according to the present embodiment is transversely deformed in the arrow direction (left direction) in the drawing.

At this time, the insulator 50 is largely deformed without causing the inner convex portion 61 on one side (right side in the drawing) to interfere with the corresponding outer convex portion 71.

Therefore, in the present embodiment, when the front and rear forces of the lower arm 3 are generated, the deformation of the insulator 50 is greatly generated. Thus, the impact force due to the forward and backward loads can be sufficiently absorbed through the deformation amount of the insulator 50, so that the vibration insulation Performance is improved and it is advantageous for a ride comfort.

On the other hand, referring to Figure 2b, when the lateral force acts in one direction in the bump state when turning to the left while the vehicle is running, the lower arm 3 is the front bush (5) by the lateral load input from the vehicle It rotates counterclockwise in the figure, and the insulator 50 of the bushing unit 100 according to the present embodiment is transversely and torsionally deformed in the direction of the arrow in the figure (right direction).

Here, the insulator 50 has a stopping in the transverse direction and torsional deformation while the outer convex portion 71 corresponding to the inner convex portion 61 on the other side (left side in the drawing) is in contact with the inner convex portion 61.

On the other hand, referring to Figure 2c, when the lateral force is applied in the other direction in the rebound state when turning to the right while the vehicle is running, the lower arm 3 is the front bush ( 5) rotates clockwise in the drawing, the insulator 50 of the bushing unit 100 according to the present embodiment is transversely and torsionally deformed in the direction of the arrow (left direction) in the drawing.

At this time, the insulator 50 is made to stop transverse direction and torsional deformation while the outer convex portion 71 corresponding to the inner convex portion 61 on one side (right side in the drawing) is in contact with the inner convex portion 61.

Therefore, in the present embodiment, when the lateral force of the lower arm 3 occurs, the amount of deformation of the insulator 50 decreases, so that the lateral rigidity of the vehicle is increased, thereby improving the handling according to the turning driving of the vehicle, and thus the fineness of the steering. Can be planned.

As described so far, according to the vehicle lower arm bushing unit 100 according to the exemplary embodiment of the present invention, the inner and outer parts 61 and the outer convex part 71 are formed in the insulator 50 to generate the vehicle while driving. Corresponding front and back forces and lateral forces can satisfy the required characteristics for each direction of front and back and lateral loads.

As a result, in this embodiment, the rigidity with respect to the lateral load can be increased, and the ride comfort and handling characteristics of the vehicle can be improved by minimizing the rigidity with respect to the front-rear load.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

10 ... outer pipe 30 ... inner pipe
50 ... insulator 51 ... working hole
61 ... inner section 71 ... outer section

Claims

In the bushing unit mounted to one end of the lower arm for mounting the lower arm of the suspension device to the members of the vehicle body,
Outer pipe;
An inner pipe disposed inside the outer pipe; And
An insulator bonded between the outer pipe and the inner pipe to the outer circumferential surface of the inner pipe and the inner circumferential surface of the outer pipe
Including;
The insulator has working holes formed on both sides of the inner pipe, respectively, and inner convex portions protrude from both sides of the outer circumferential surface of the inner pipe, and outer convex portions on the inner circumferential surface side of the outer pipe corresponding to the respective inner convex portions. Lower arm bush unit for a vehicle, characterized in that formed protruding.

The method according to claim 1,
The outer convex portion,
A lower arm bushing unit for a vehicle, characterized in that it is formed as a stopper projection which stops by the inner convex portion.

The method according to claim 1 or 2,
The outer convex portion protrudes on the inner circumferential surface side of the outer pipe from each of the inner convex portions.

The method of claim 3,
The lower arm bush unit for a vehicle, characterized in that the inner convex portion and the outer convex portion is formed on the inner circumferential surface of each of the action holes.