KR20020040052A - Pillow ball bush for vehicle - Google Patents

Abstract

PURPOSE: A pillow ball bush is provided to improve ride comfort and driving stability by smoothly executing spring characteristics. CONSTITUTION: A plurality of grooves(12a) are formed on an inner circumferential surface of a bearing member(12), contacting with a circular protrusion(11b) of a stud member(11) to improve a spring characteristic(Q1) of the stud member rotating in radial direction of an axis and a spring characteristic(Q2) of the stud member fluctuating in vertical direction of the axis. The spring characteristics of the stud member are determined by number and size of the grooves. The number and the size of the grooves are determined by viscosity of grease(14) made of magneto-rheological(MR) fluid.

Description

Pillow Ball Bush for Automotive {PILLOW BALL BUSH FOR VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pillow ball bush for automobiles, and more particularly, to a pillow ball bush for automobiles, which is capable of improving ride comfort and adjustment stability.

In general, a pillow ball bush is a joint provided at the end or one side of arms and links that constitute a suspension system or steering system and interconnects a sub frame of a vehicle. As shown in FIG. 1, the pillow ball bush 10 has a stud member 11 having a through hole 11a penetrating both sides thereof, and an outer circumferential surface of the circular protrusion 11b provided in the stud member 11. A bearing member 12 installed to surround the dust cover, a dust cover member 13 configured to wrap and protect both ends of the stud member 11 while connecting the bearing member 12 and the stud member 11, and the The grease 14 of the magneto-rheological (MR) fluid component filled in the gap between the stud member 11 and the bearing member 12 and the dust cover member 13, and the outer peripheral surface of the bearing member 12 The inner case member 15 is installed so as to protect the wrapped, the dust A sheet member 16 fitted into a gap between the cover member 13 and the inner case member 15, and an impact absorbing member 17 made of rubber material to surround and protect the outer circumferential surface of the inner case member 15; The outer pipe member 18 is formed to surround and protect the outer circumferential surface of the shock absorbing member 17.

Here, the magneto-rheological (MR) fluid is a fluid whose viscosity (yield stress) changes according to the change of the magnetic field, and is a fluid having a property that the viscosity increases as the strength of the magnetic field increases.

Accordingly, the arm and the link member are inserted into the through hole 11a of the stud member 11 to be coupled to each other. The stud member 11 is shown in FIG. 1 according to the characteristics of the arm and the link member. It has a spring characteristic that is rotated in the circumferential direction of the axis as shown by arrow Q1 and a spring characteristic that flows in the up and down direction of the axis as shown by arrow Q2.

However, according to the conventional pillow ball bush 10 as described above, the spring characteristics (Q1) rotated in the circumferential direction of the shaft and the spring characteristics (Q2) flowing in the vertical direction of the shaft are the spring characteristics of the arm and the link member coupled to each other. Since it is fixed after being adjusted in advance in the design stage to fit the function, if the spring characteristic function of the arm and the link member is changed even a little, the circular projection 11b of the stud member 11 and the bearing member 12 Since the inner circumferential surface is coupled so as to be in close contact with each other, the pillow ball bush 10 only performs a function of a joint for joining the members of the arm and the link with each other, and properly performs the spring characteristic function in the Q1 or Q2 direction. Not only that, but also this resulted in poor riding comfort and reduced stability of adjustment.

Accordingly, the present invention has been made to solve the above problems, by forming a plurality of grooves on the inner circumferential surface of the bearing member in close contact with the circular projection of the stud member, spring characteristics of the arm and link member coupled to the stud member Even if the change is made, the pillow ball bush for automobiles can improve ride comfort and adjustment stability by properly performing the spring characteristics rotated in the circumferential direction of the shaft and the spring characteristics flowing in the vertical direction of the shaft by the number and size of the grooves. The purpose is to provide.

In order to achieve the above object, the present invention provides a bearing member such that a stud member configured to perform a joint function of a plurality of arms and link members has a spring characteristic that is rotated in the circumferential direction of the shaft and a spring characteristic that flows in the vertical direction of the shaft. In the pillow ball bush for automobiles to be configured in combination with, the inner peripheral surface of the bearing member in contact with the circular projection of the stud member, the spring characteristics of the stud member rotated in the circumferential direction of the shaft and the stud flowing in the vertical direction of the shaft A plurality of grooves are formed to improve the spring characteristics of the member.

1 is a schematic partial longitudinal cross-sectional view illustrating a conventional pillow ball bush generally used;

Figure 2 is a schematic partial longitudinal cross-sectional view for explaining the pillow ball bush according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10-pillow ball bush 11-stud member

11a-through hole 11b-circular projection

12-bearing member 12a-groove

13-dust cover member 14-grease

15-inner case member 16-sheet member

17-shock absorbing member 18-outer pipe member

DETAILED DESCRIPTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic partial longitudinal cross-sectional view for explaining the pillow ball bush according to the present invention, will be described with the same reference numerals to the same parts as the conventional structure.

As shown in FIG. 2, the pillow ball bush 10 according to the present invention includes a stud member 11 having a through hole 11a penetrating both sides, and a circular protrusion part provided in the stud member 11. The bearing member 12 installed to surround the outer circumferential surface of 11b), and the dust cover member 13, which is formed to surround and protect both ends of the stud member 11 while connecting the bearing member 12 and the stud member 11 to each other. ), Grease (M) of magneto-rheological (MR) fluid component filled with a gap between the stud member 11 and the bearing member 12 and the dust cover member 13, and the bearing member 12. An inner case member 15 installed to surround and protect the outer circumferential surface of the cover member), a sheet member 16 fitted into a gap between the dust cover member 13 and the inner case member 15, and the inner case member ( A shock absorbing member (17) made of rubber material to surround and protect the outer circumferential surface of It consists of an outer pipe member 18 so as to surround the outer circumferential surface of the protection member 17.

Here, the magneto-rheological (MR) fluid is a fluid whose viscosity (yield stress) changes according to the change of the magnetic field, and is a fluid having a property that the viscosity increases as the strength of the magnetic field increases.

In addition, on the inner circumferential surface of the bearing member 12 in contact with the circular protrusion 11b of the stud member 11, the spring characteristic Q1 of the stud member 11 rotated in the circumferential direction of the shaft as shown by an arrow shown in FIG. 2. ) And a plurality of grooves 12a are formed to improve the spring characteristic Q2 of the stud member 11 flowing in the vertical direction of the shaft.

On the other hand, the spring characteristics (Q1, Q2) of the stud member 11 is determined according to the number and size of the groove (12a).

That is, when the arm or link member inserted into the through hole 11a of the stud member 11 and coupled to each other is rotated in the Q1 direction shown in FIG. 2, the stud member 11 is also rotated in the same Q1 direction. Accordingly, a magnetic field generated by frictional heat is generated on the circular protrusion 11b of the stud member 11 and the inner circumferential surface of the bearing member 12.

In addition, grease 14 of MR (Magneto-rheological) fluid component filled in the gap between the stud member 11 and the bearing member 12 and the dust cover member 13 is the stud member 11. And the viscosity is gradually increased by the friction magnetic field of the bearing member 12. When the viscosity of the finished grease 14 maintains a viscosity higher than the spring characteristic of the pillow ball bush 10, the groove 12a While increasing the number, the number is increased to maintain the same viscosity as the spring characteristic value of the pillow ball bush 10, on the contrary, the viscosity of the finished grease 14 is lower than the spring characteristic value of the pillow ball bush 10 When maintaining the size of the groove (12a) to reduce the number is reduced to maintain the same viscosity as the spring characteristic value of the pillow ball bush (10).

Therefore, the pillow ball bush 10 of the present invention having a plurality of grooves 12a on the inner circumferential surface of the bearing member 12 according to the present invention has a shaft according to the characteristics of the arm and link members coupled to the stud member 11. Since the spring characteristic Q1 rotated in the circumferential direction and the spring characteristic Q2 flowing in the vertical direction of the shaft can be changed by themselves, the groove 12a is not provided as described above with reference to FIG. The ride comfort and adjustment stability of the occupant than the pillow ball bush 10 is improved.

As described above, according to the present invention, a plurality of grooves are formed on the inner circumferential surface of the bearing member in contact with the circular protrusion of the stud member so that the stud member is rotated in the circumferential direction of the shaft according to the characteristics of the arm and the link member, and Since it is possible to change the characteristics of the spring flowing in the vertical direction of the shaft itself, there is an effect of improving the merchandise while improving the ride comfort and adjustment stability of the occupant.

Claims (2)

The bearing member 12 such that the stud member 11 adapted to perform the joint function of the plurality of arms and the link members has a spring characteristic Q1 that rotates in the circumferential direction of the shaft and a spring characteristic Q2 that flows in the vertical direction of the shaft. In the automobile pillow ball bush to be configured in combination with, The inner circumferential surface of the bearing member 12 in contact with the circular protrusion 11b of the stud member 11, the spring characteristic (Q1) of the stud member 11 rotated in the circumferential direction of the shaft and the flow in the vertical direction of the shaft Pillow ball bush for automobiles, characterized in that a plurality of grooves (12a) is formed to improve the spring characteristic (Q2) function of the stud member (11). 2. The pillow ball bush for automobiles according to claim 1, wherein the spring characteristic (Q1, Q2) function of the stud member (11) is determined according to the number and size of the grooves (12a).