KR20030048839A - Apparatus for testing endurance of a bush use in a brake booster - Google Patents

Abstract

PURPOSE: An endurance testing apparatus for a bush of a brake booster is provided to precisely test endurance of the bush of the brake booster by utilizing a motor. CONSTITUTION: An endurance testing apparatus includes a base(11), a bush supporting member(20) installed at one side of the base(11), and a holder(14) for supporting one side of a valve body(13) coupled to an inner peripheral portion of a bush(12). The bush(12) is provided at an inner peripheral portion of the bush supporting member(20). The bush supporting member(20) has first and second bodies(21,22) coupled to each other while forming a space section(23). An air suction port(24) is formed at one side of the first body(21) in order to maintain the space section(23) in a vacuum state. The holder(14) is mounted on a slider(15), which is slidably coupled to a rail(16).

Description

Durability test device of bush for brake booster {APPARATUS FOR TESTING ENDURANCE OF A BUSH USE IN A BRAKE BOOSTER}

The present invention relates to a durability test apparatus for a bush for a brake booster, and more particularly, to a durability test apparatus for a bush for a brake booster having a simple structure and capable of accurately measuring the durability of the bush.

FIG. 1 shows an example of a brake booster, in which a power chamber 2 is divided into a front chamber 4 and a rear chamber 5 by a center plate 3, and a center portion of the center plate 3 is illustrated. The valve body 6 is installed therethrough, and the inner circumferential surface of the center plate 3 is in contact with the outer circumferential surface of the valve body 6 to allow the valve body 6 to reciprocate while maintaining airtightness. ) Is installed.

When the brake booster is used for a long time, the bush 7 wears due to friction with the valve body 6, and if the wear of the bush progresses to some extent, stick slip noise is generated, which acts as a factor that lowers the reliability of the product. do.

Therefore, in order to reduce stick slip noise of the brake booster, the entire assembled brake booster is subjected to a durability test using a hydraulic system as an durability test apparatus.

However, since such a conventional durability test apparatus is composed of a hydraulic system, its structure is complicated, expensive, and the durability of the entire brake booster is not only difficult to accurately measure the durability of the bush but also has a lot of constraints on the test conditions. There was a problem to be followed.

The present invention is to solve the conventional problems as described above, and has an object of providing a durability test apparatus for the bush for the brake booster having a simple structure using a motor that can accurately test the durability of the bush.

In order to achieve the above object, the present invention provides a base, a bush support member installed on one side of the base and supported by a bush on an inner circumferential surface, and one side of a valve body coupled to an inner circumferential surface of a bush supported on the bush support member. A holder for supporting, a slider on which the holder is mounted and installed linearly along the rail, a switching plate having one side fixed to the slider and a long hole formed at the other side, and an eccentrically coupled to the long hole of the switching plate. It is characterized by providing a durability test apparatus for a bush for a brake booster having a connector having an axis and a motor connected with the connector and the reducer.

1 is a cross-sectional view schematically showing a brake booster.

Figure 2 is a sectional view showing the durability test apparatus of the bush for the brake booster according to the present invention.

Figure 3 is a plan view of excerpts of FIG.

<Description of the code | symbol about the principal part of drawing>

11: base 12: bush

13: valve body 14: holder

15 slider 16 rail

17: switch plate 18: long hole

20: bush support member 21, 22: first and second body

23: space portion 24: air intake

30: motor 31: reducer

33: connector 34: eccentric shaft

35: bearing

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

Figure 2 is a front view showing the durability test apparatus of the brake booster bush according to the present invention, Figure 3 is a plan view showing the main portion of the durability test apparatus of the bush for the brake booster according to the present invention.

As shown in FIG. 2, the durability test apparatus for the bush for the brake booster according to the present invention includes a base 11 and a bush support member 20 installed on one side of the base 11 and supporting the bush 12 on an inner circumferential surface thereof. And a holder 14 for supporting one side of the valve body 13 coupled to the inner circumferential surface of the bush 12 supported by the bush support member 20.

The bush support member 20 is formed of a first body 21 and a second body 22 which are coupled to each other to form a space 23 therebetween and each bush is supported on an inner circumferential surface thereof. One side of the body 21 is formed with an air inlet 24 for sucking air in the space 23 to maintain the space 23 in a vacuum state.

And the holder 14 is mounted on the slider 15, the slider 15 is coupled to be linearly movable along the rail 16, one side of the conversion plate 17 is fixed to one side of the upper surface of the slider 15 On the other side of the conversion plate 17, the long hole 18 is formed.

In addition, a reduction gear 31 is connected to the drive shaft of the motor 30, and a connector 33 having an eccentric shaft 34 formed at an end thereof is connected to the shaft 32 of the reduction gear 31, and an eccentric shaft of the connector 33 is connected. The bearing 35 is coupled to the 34, and the eccentric shaft 34 is movably coupled to the long hole 18 of the switching plate 17 through the bearing 35.

The durability test apparatus of the bush for the brake booster according to the present invention configured as described above supports the bush 12 on the inner circumferential surface of the bush support member 20, and is provided on the inner circumferential surface of the bush 12 supported by the bush support member 20. After coupling the valve body 13, one side of the valve body 13 is fixed to the holder 14, and air is supplied through the air inlet 24 formed in the first body 21 of the bushing support member 20. The suction keeps the space 23 in a vacuum state.

When the motor 30 is driven, the eccentric shaft 34 of the connector 33 installed on the shaft 32 of the reducer 31 is coupled to the long hole of the switching plate 17 as shown in FIG. 3. It rotates while drawing a circle, and the conversion plate 17 moves linearly back and forth.

Accordingly, the slider 15 fixed to one side of the switching plate 17 is linearly reciprocated along the rail 16, and the valve body 13 fixed to the slider 15 through the holder 14 is linearly reciprocated. While the outer circumferential surface is frictional reciprocating motion with the inner circumferential surface of the bush 12 supported by the bush support member 20.

Then, after the friction reciprocating motion between the bush 12 and the valve body 13 for a predetermined number of times, the durability of the bush is measured by measuring the degree of wear of the bush.

As described above, the durability test apparatus of the bush for the brake booster of the present invention can test the durability of the bush accurately and easily with a simple structure using a motor.

Claims (3)

A base, a bush supporting member installed on one side of the base and supporting a bush on an inner circumferential surface thereof, a holder supporting one side of a valve body coupled to an inner circumferential surface of a bush supported by the bush supporting member, and the holder mounted thereon and a rail A slider installed to be linearly movable along the switch, a switching plate having one side fixed to the slider and having a long hole formed at the other side, and a connector having an eccentric shaft movably coupled to the long hole of the switching plate; Durability test apparatus of the bush for the brake booster, characterized in that it comprises a motor connected. The method of claim 1, The bush supporting member is formed of a first body and a second body which are coupled to each other to form a space therebetween and the bush is supported on the inner circumferential surface thereof, and on one side of the first body, the air is sucked in the space. Durability test apparatus of the bush for the brake booster, characterized in that the air inlet is formed for maintaining the vacuum portion. The method of claim 1, Eccentric shaft of the connector, the durability test apparatus of the bush for the brake booster, characterized in that coupled to the long hole of the conversion plate through a bearing.