KR20130091607A

KR20130091607A - Rear suspension trailing arm bush apparatus

Info

Publication number: KR20130091607A
Application number: KR1020120013018A
Authority: KR
Inventors: 이영석
Original assignee: 현대자동차주식회사
Priority date: 2012-02-08
Filing date: 2012-02-08
Publication date: 2013-08-19

Abstract

PURPOSE: A suspension trailing arm bush device is provided to improve durability by removing a torsional load by applying a sliding bearing to a liquid sealing type bush. CONSTITUTION: A suspension training arm bush device comprises an inner rod, a fixed pipe (14), a sliding bearing, and a liquid sealing type bush. The inner rod comprises an axis part which supports the liquid sealing type bush, and a connecting part (13) which connects the liquid sealing type bush to a car body. The fixed pipe is installed between the axis part and the sliding bearing, and fixes the sliding bearing and the liquid sealing type bush to the inner rod. The sliding bearing is installed between the inner rod and the liquid sealing type bush, and removes a torsional load inputted to the liquid sealing type bush. The liquid sealing type bush reduces and blocks a vibration generated from a road by a flow of a fluid by sealing a fluid encapsulation space (22) hermetically by putting the fluid into the fluid encapsulation space.

Description

Suspension trailing arm bush apparatus

The present invention relates to a suspension trailing arm bush device, and more particularly, to a suspension trailing arm bush device that can improve durability.

Suspension for vehicles exists between the vehicle body and the wheels and is a device that connects the two rigid bodies using one or more links. It is supported by springs and hydraulic shock absorbers in the up and down directions, and in other directions. By appropriately balancing high stiffness and flexibility, it is possible to mechanically balance the relative movement between the body and the wheels.

The suspension system effectively blocks irregular input of the road surface generated while driving the vehicle, providing a comfortable ride to the occupant, and provides convenience of driving by appropriately controlling the shaking of the car body caused by driver's driving behavior and road curvature. In addition, by maintaining the vertical load on the tire ground surface at an appropriate level when driving on an irregular road surface, the maneuverability and stability of the vehicle during turning and braking driving should be secured.

Suspension devices that have been developed and used to secure the maneuverability and stability of such vehicles are mainly based on rear suspension systems such as a trailing arm type, a torsion beam axle type, a strut type, and a double wishbone type. And insufficient to ensure sufficient stability.

Recently, a multi-link suspension system has been developed that can effectively absorb shocks and vibrations input from the road surface and vehicle body vibrations by ideal kinematic movement using at least three links. It is applied to mass production vehicles.

1 is a perspective view showing a multi-link suspension system according to the prior art, in which a torsion beam 1 is provided in a vehicle width direction, and a carrier 4 for mounting a tire 5 and a wheel at both ends of the torsion beam 1 is provided. ) Is installed.

In addition, trailing arms 2 are provided at both ends of the torsion beam 1 so as to regulate the longitudinal movement of the vehicle.

The trailing arm bush 6 is mounted at the front end of the trailing arm 2, thereby effectively preventing the impact of the front-rear direction from being transmitted from the road surface to the vehicle body.

Reference numeral 3 is a shock absorber.

Since the trailing arm bush 6 is less constrained in layout, a relatively large rubber bush is used. Since the trailing arm bush 6 is larger than the bush in other parts, it requires a large mounting space and can effectively insulate vibration. Enclosed bushes have been developed and are being applied.

However, the application of the liquid-sealed bush is delayed due to the weak durability because the trailing arm bush 6 has a complex load such as torsion (rotational direction), front and rear, up and down direction due to its mounting position.

The present invention has been invented to solve the above problems, by applying a sliding bearing to the liquid-enclosed bush, by removing the torsional load that has the greatest effect on the durability of the input load elements acting on the bush, durability The object is to provide a suspension trailing arm bush device that can be improved.

Suspension trailing arm bush device according to the present invention to achieve the above object is an inner rod that serves as an axis; A liquid-enclosed bush inserting and sealing a fluid therein to attenuate vibrations and shocks transmitted from the outside by fluid flow; And bearing means mounted between the inner rod and the liquid enclosed bush so as to remove the torsional load of the elements of the input load transmitted through the liquid enclosed bush.

The bearing means is a sliding bearing, the sliding bearing is an inner sliding bearing fitted to the inner rod; And an outer sliding bearing disposed in a concentric manner so as to be in contact with an outer circumferential surface of the inner sliding bearing and rotating in sliding contact.

The inner slide bearing or the outer slide bearing has a lubrication hole, and oil is supplied through the lubrication hole so as to promote lubrication between the inner slide bearing and the outer slide bearing.

The liquid encapsulated bush may include a fluid encapsulation space spaced in the circumferential direction to seal the fluid therein; A protrusion formed in the fluid encapsulation space; And an orifice connecting between the fluid encapsulation spaces.

The advantages of the suspension trailing arm bush device according to the present invention are as follows.

Firstly, the trailing arm bush of the rear suspension can be applied to the liquid enclosed bush instead of the rubber bush to more effectively insulate the vibration transmitted from the road surface, as well as the sliding bearing between the inner rod and the liquid enclosed bush. Thus, durability performance can be improved by eliminating unnecessary torsional loads acting on the liquid encapsulated bush. This makes it possible to apply a liquid-enclosed bush, which is poor in durability when no sliding bearing is applied.

Second, when the sliding bearing is applied to the existing simple rubber bush, it is possible to lower the hardness of the bush for improving the NVH performance.

1 is a perspective view showing a multi-link type rear wheel suspension according to the prior art
2 is a perspective view of a suspension trailing arm bush device according to an embodiment of the present invention
3 is an exploded perspective view of the trailing arm bush device in FIG.
4 is a cross-sectional view of the trailing arm bush device in FIG.
5 is a process chart showing a method of assembling the trailing arm bush device in FIG.

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.

2 is a perspective view of a suspension trailing arm bush device according to an embodiment of the present invention, Figure 3 is an exploded perspective view of the trailing arm bush device in FIG.

The present invention relates to a suspension trailing arm bush device 10 which can improve durability by removing unnecessary torsional loads among the elements of the input load of the trailing arm bush.

The trailing arm bush apparatus according to the present invention is applicable not only to the multi-link type but also to the rear suspension such as a coupled torsion beam axle (CTBA) type.

The suspension trailing arm bush device 10 uses a liquid-enclosed trailing arm bush to more effectively insulate the vibration transmitted from the road surface.

In one embodiment of the present invention, the sliding bearing 19 may be applied to the liquid-sealed bush 20 in order to remove the torsional load among the elements of the load input to the trailing arm bush device 10.

The trailing arm bush device 10 of the liquid encapsulation type according to an embodiment of the present invention is an inner rod 11 for supporting the liquid enclosed bush and a fixed pipe fixed to the inner rod 11. 14, a sliding bearing 19 for removing the torsional load, and a liquid-sealed bush 20 supported by the sliding bearing 19. As shown in FIG.

The inner rod 11 is composed of a shaft portion 12 for supporting the liquid-enclosed bush 20 and a fastening portion 13 for connecting the liquid-enclosed bush 20 to the vehicle body.

Shaft portion 12 is formed of a rod-shaped cylindrical structure, the projection jaw 12a in the middle of the rod is continuously formed along the circumferentially large diameter, the shaft portion 12 with the projection jaw (12a) in the center The first fixed pipe 14a is press-fitted to one side of, and the second fixed pipe 14b is press-fitted to the other side of the shaft portion 12.

At this time, the outer diameter of the projection jaw (12a) is the same as the outer diameter of the fixed pipe 14, the inner when the first and second fixed pipes (14a, 14b) are inserted into one side and the other side of the shaft portion 12, respectively The inner circumferential surface of the sliding bearing 16 contacts the inner sliding bearing 16 with the fixed pipe 14 by simultaneously contacting the protruding jaw 12a and the outer circumferential surfaces of the first and second fixed pipes 14a and 14b at the same time. Can be fitted to

The fastening portion 13 is formed to protrude in a plate structure at both ends of the shaft portion 12, a circular fastening hole is formed in the plate, it is possible to connect the shaft portion 12 to the vehicle body by inserting a bolt through the fastening hole. .

The fixed pipe 14 may be installed between the shaft portion 12 and the inner sliding bearing 16 to fix the sliding bearing 19 and the liquid-sealed bush 20 to the inner rod 11.

The fixed pipe 14 is composed of first and second fixed pipes 14a and 14b which are fitted to both sides of the shaft portion 12 on circular curved surfaces of the same diameter, respectively.

Flange portions 15 are formed at one ends of the first and second fixed pipes 14a and 14b, respectively, and the length of each fixed pipe 14 is the shaft portion 12 at the protruding jaw 12a of the shaft portion 12. It is equal to the length to the end of the, and each flange portion 15 is disposed to face both ends of the shaft portion 12, when the sliding bearing 19 is fitted to the fixed pipe 14 fixed pipe ( 14) it can be prevented from falling in the axial direction.

The sliding bearing 19 is inserted between the inner rod 11 and the liquid enclosed bush 20 to allow relative movement between the inner rod 11 and the liquid enclosed bush 20, thereby providing a liquid enclosed bush. The torsional load input to (20) can be removed.

The sliding bearing 19 is composed of an inner sliding bearing 16 fixed to the inner rod 11 side, and an outer sliding bearing 18 fixed to the liquid-sealed bush 20, and the inner sliding bearing 16 A lubricant, for example oil, is inserted between the outer slide bearing 18 and the outer slide bearing 18.

The inner sliding bearing 16 has a cylindrical pipe structure, and the first and second fixed pipes 14a and 14b and the inner rod 11 are fitted into the inner sliding bearing 16.

At this time, the inner sliding bearing 16 has a lubrication hole 17, and the oil is supplied between the inner sliding bearing 16 and the outer sliding bearing 18 from the outside through the lubrication hole 17 to slide in the rotational direction. Can be more effectively facilitated.

The outer sliding bearing 18 is fitted to the outer circumferential surface of the inner sliding bearing 16 in a concentric manner with the inner sliding bearing 16, and is circumferentially in sliding contact with the inner sliding bearing 16 through oil. Freely rotatable

At this time, the outer sliding bearing 18 is fitted inside the liquid-sealed bush 20 to receive the torsional load among the elements of the input load from the liquid-sealed bush 20 and slide with the inner sliding bearing 16. Induce to absorb through contact.

Engaging ends 18a protrude in the circumferential direction at both end edges of the outer sliding bearing 18, and the locking ends 18a are axially removed from the outer bearing as the liquid-sealed bush 20 is caught. Can be prevented.

The liquid-enclosed bush 20 is fitted into a mounting groove formed in an arc shape in a concave shape at the tip of the trailing arm, and receives a load from the road surface through the trailing arm.

The liquid-sealed bush 20 has a circular body 20a having a circular pipe shape, an opening between the circular side member 20b formed radially at both ends of the circular body 20a, and the side member 20b. It consists of the outer pipe 23 which seals and has a circular ring shape as a whole.

The liquid-enclosed bush 20 has a fan-shaped fluid encapsulation space 22 formed in a predetermined section along the circumferential direction therein, and a protrusion 21 on the outer circumferential surface of the circular body 20a in the fluid enclosed space 22. Is formed integrally.

The liquid encapsulated bush 20 having such a structure is provided with a fluid in the fluid encapsulation space 22 to be sealed to receive a viscous resistance and an inertia resistance by the protrusion 21 when the fluid flows. In order to increase the damping effect is to reduce and block the vibration generated from the road surface.

In addition, the fluid encapsulation space 22 may be formed of at least two or four, the fluid encapsulation space 22 and the fluid non-encapsulation space may be formed alternately along the circumferential direction, the fluid encapsulation space 22 An orifice 24 is formed in the fluid unsealed space (solid state in a solid structure) in between.

Due to the structural characteristics of the protrusion 21 formed in the fluid sealing space 22, the width is smaller than the length, so that the liquid resistance in the front-rear direction (or the circumferential direction of the liquid-enclosed bush 20) is smaller than the width direction of the protrusion 21. Because it is small, the damping effect is inferior.

The orifice 24 is formed long in the circumferential direction in the non-liquid encapsulation region, thereby increasing the liquid resistance in the front-rear direction, thereby increasing the insufficient damping effect of the protrusion 21.

Referring to the assembly method of the liquid-enclosed bush 20 configured as described above are as follows.

5 is a process diagram illustrating a method of assembling the trailing arm bush device in FIG. 2.

One end of the inner rod 11 is inserted into the first fixing pipe 14a to fix the first fixing pipe 14a to one side of the outer peripheral surface of the shaft portion 12 of the inner rod 11.

At this time, the flange portion 15 formed at one end of the first fixed pipe 14a is located at one end of the shaft portion 12, and the opposite end of the first fixed pipe 14a is the protruding jaw 12a of the shaft portion 12. Assembled to close contact with).

Then, the other end of the inner rod 11 is inserted into the inner slide bearing 16 so that the inner slide bearing 16 has the first fixed pipe 14a, the protruding jaw 12a of the shaft portion 12, and the first portion. 2 fixed pipe (14b) is to be fitted over the other side of the outer peripheral surface of the shaft portion 12 leaving a space to be inserted.

Subsequently, after inserting and fixing the outer sliding bearing 18 into the liquid-sealed bush 20, the other end of the inner rod 11 is inserted into the outer sliding bearing 18 to thereby secure the inner rod 11. Inner sliding bearings 16 mounted on the inner slide bearings 16 are in contact with the inner sliding bearings 18.

Finally, the second fixed pipe 14b is sandwiched and fixed between the inner slide bearing 16 and the outer peripheral surface of the shaft portion 12 of the inner rod 11 to complete the assembly of the liquid-sealed bush device 10.

In the assembled state, the liquid encapsulated bush 20 is penetrated by the inner rod 11 to be coupled to the hinge structure, so that the liquid sealed bush 20 is rotatable about the inner rod 11.

Referring to the operation of the liquid-enclosed bush 20 assembled in the above structure as follows.

4 is a cross-sectional view of the trailing arm bush device in FIG. 2.

As shown in FIGS. 1 and 4, when the vibration and shock generated from the road surface are transmitted to the vehicle body in detail, trailings formed at both ends of tires, wheels, and torsion beams that are in friction contact with the road surface It is delivered to the liquid enclosed bush 20 via an arm.

Vibration and shock transmitted to the liquid encapsulated bush 20 flow the fluid enclosed in the fluid encapsulation space 22 of the liquid enclosed bush 20, with the viscous resistance as the fluid strikes the protrusion 21. And it is possible to attenuate vibration and shock by increasing the inertial resistance, and also to maximize the shock absorbing effect of the vehicle body by the fluid flow between the liquid chamber in the front and rear direction through the orifice 24.

When the sliding bearing 19 is applied to the liquid-enclosed bush 20 acting as described above, the following effects are obtained.

The elements of the load input through the liquid enclosed bush 20 are mainly front, rear, up and down loads and torsional (rotational) loads, and the input loads are sliding bearings 19, first and second fixed pipes. (14a, 14b), the inner rod 11, the body bracket connected to the fastening portion 13 of the inner rod 11, is transferred to the vehicle body, at this time to remove the unnecessary load element torsion load through the sliding bearing (19) can do.

For example, as shown in FIG. 4, when the torsional load is applied to the liquid-sealed bush 20 in the rotational direction, the liquid-sealed bush 20 rotates and the circular body 20a of the liquid-sealed bush 20 is rotated. The outer sliding bearing 18 coupled directly rotates.

The outer sliding bearing 18 slides in the circumferential direction along the outer circumferential surface of the inner sliding bearing 16 through the sliding action of the lubricating oil, and the first and second fixed pipes fitted into the inner sliding bearing 16 and the inside thereof. 14a and 14b, the inner rod 11 is stopped by inertia, so that only the load in the front and rear and up and down directions is transmitted without transmitting the torsional load transmitted through the liquid enclosed bush 20 to the vehicle body.

Therefore, according to the present invention, by applying the liquid enclosed bush 20 instead of the rubber bush with the trailing arm bush of the rear suspension, it is possible not only to effectively insulate the vibration transmitted from the road surface, but also to the inner rod 11 and the liquid. By applying the sliding bearings 19 between the enclosed bushes 20, the durability performance can be improved by removing unnecessary torsional loads acting on the liquid enclosed bushes 20. This makes it possible to apply the liquid-sealed bush 20, which is weak in durability when the sliding bearing 19 is not applied.

In addition, when the sliding bearing 19 is applied to the existing simple rubber bush, it is possible to lower the hardness of the bush for improving the NVH performance.

Here, the sliding bearing 19 is applied between the inner rod 11 and the liquid enclosed bush 20, but instead of the sliding bearing 19, the liquid enclosed bush 20 such as a ball bearing or a roller bearing is inner. Any bearing means capable of rotating relative to the rod 11 is applicable to this.

10: liquid enclosed bush device 11: inner rod
12: shaft portion 12a: protruding jaw
13 fastening part 14 fixed pipe
14a: 1st fixed pipe 14b: 2nd fixed pipe
15 flange portion 16 inner slide bearing
17: lubrication hole 18: outer sliding bearing
18a: engaging end 19: sliding bearing
20: liquid enclosed bush 20a: circular body
20b: side member 21: protrusion
22: fluid sealing space 23: outer pipe
24: orifice

Claims

An inner rod 11 serving as an axis;
A liquid-enclosed bush 20 inserting and sealing a fluid therein to attenuate vibrations and shocks transmitted from the outside by fluid flow;
Bearing means mounted between the inner rod 11 and the liquid enclosed bush 20 to remove torsional loads among elements of the input load transmitted through the liquid enclosed bush;
Suspension trailing arm bush device, characterized in that configured to include.

The method according to claim 1,
The bearing means is a sliding bearing (19), the sliding bearing (19) is an inner sliding bearing (16) fitted to the inner rod (11); And
An outer sliding bearing 18 disposed concentrically in contact with an outer circumferential surface of the inner sliding bearing 16 and rotating in sliding contact;
Suspension trailing arm bush device, characterized in that consisting of.

The method according to claim 2,
The inner slide bearing 16 or the outer slide bearing 18 has a lubrication hole 17, and oil is supplied through the lubrication hole 17 to lubricate between the inner slide bearing 16 or the outer slide bearing 18. Suspension trailing arm bush device, characterized in that the action can be promoted.

The method according to claim 1,
The liquid-enclosed bush 20 has a fluid encapsulation space 22 formed at intervals in the circumferential direction to seal the fluid therein;
A protrusion 21 formed in the fluid encapsulation space 22; And
An orifice (24) connecting between the fluid containment spaces (22);
Suspension trailing arm bush device comprising a.

The method according to claim 1,
It is installed between the sliding bearing 19 and the inner rod 11, and by using the flange portion 15 formed at the end to prevent the sliding bearing 19 from falling out in the axial direction from the inner rod 11 Suspension trailing arm bush device further comprises a fixed pipe (14).