KR20000018909U - hold down structure of parking brake - Google Patents

Abstract

The present invention relates to a parking brake of a motor vehicle, which is coupled to a clip on the back plate side and protrudes to form an inner wall of the brake shoe at a hold down spring for elastically supporting the shoe assembly to the back plate. The coupling hole is formed on the inner wall surface of the brake shoe so that the projection of the hold down spring and the coupling hole of the shoe assembly are elastically unevenly coupled during assembly. As a result, the shoe assembly can be prevented from being separated from the back plate.

Description

Hold down structure of parking brake

The present invention relates to a parking brake of an automobile, and more particularly, protrudes into the inner wall of the brake shoe to a hold down spring coupled to a clip on the back plate side to elastically support the shoe assembly on the back plate. The shoe assembly is formed by forming a projection and forming a coupling hole on the inner wall of the brake shoe so that the projection of the hold down spring and the coupling hole of the shoe assembly are elastically unevenly coupled during assembly. And a hold down structure of a disc brake, which can be prevented from being disengaged from the position of the back plate.

As is well known, the parking brake of a vehicle is used to keep the vehicle parked or stopped, or to prevent a vehicle parked or parked on an incline such as a hill road, going below the incline.

In addition, the above-mentioned parking brake is used as an auxiliary brake when the main brake does not function properly, and employs a drum type break.

1 and 2, the drum-type parking brake has a back plate 110 formed in a disc shape and fixed to the knuckle, and a brake shoe 121 having an opening 122 open at one side of the circumference. And a lining 125 provided on the outer circumferential surface of the brake shoe 121 so as to be located in the shoe assembly 120 mounted on the back plate 110 and the opening 122 of the brake shoe 121. The wheel cylinder 130 fixed to 110 to expand the diameter of the brake shoe 121, and is installed on the outside of the brake shoe 121 and connected to the wheel to generate a braking force by the expansion of the brake shoe 121 It consists of the brake drum 150.

Accordingly, the parking brake generates hydraulic pressure in the master cylinder when the driver manipulates the hand lever with the brake pedal or the hand to act on the wheel cylinder 130 to expand the piston of the wheel cylinder 130 from side to side, and the brake shoe 121 ) Diameter. At this time, the lining 125 attached to the outer circumferential surface of the extended brake shoe 121 is compressed to the inner circumferential surface of the brake drum 150 of the wheel to generate a braking force on the wheel.

On the other hand, the shoe assembly 120 in the parking brake as described above is mounted through a hold down structure to elastically maintain a suitable position on the back plate (110).

2 and 3, the hold down structure of the parking brake, the clip 141 is fixed to the back plate 110 of the opposite side end, the wheel cylinder 130 is installed through the bolt 142, The free end of the clip 141 is formed to be bent in multiple stages in the shape of a wave (wave) is made of a structure in which the hold down spring 145 which is in contact with the inner wall surface of the brake shoe 121 is fixed.

That is, the shoe assembly 120 is fitted to the inner wall of the brake shoe 121 between the hold down spring 145 and the back plate 110 coupled to the clip 141, the hold down spring 115 at this time is The shoe assembly 120 is elastically in close contact with the back plate 110 to suppress excessive flow of the shoe assembly 120.

However, the hold down structure of the parking brake as described above is in close contact with the shoe assembly 120 to the back plate 110 through the axial elastic force of the hold down spring 145 fixed to the clip 141. Although it is possible to prevent the separation of the axial deviation of the 120, the shoe assembly 120 is up and down, especially when carrying the assembled parking brake because it is unable to support the shoe assembly 120 in the up and down, left and right directions other than the axial direction. , There is a problem that is easily separated or separated from the right position of the back plate 110 while moving to the left and right.

As described above, when the shoe assembly 120 is separated from the back plate 110 during the transportation process, the shoe assembly 120 may be lost, as well as the trouble of reassembling the shoe assembly. When the 120 is separated and separated, there is a problem that the operation of the shoe assembly 120 is unstable to lower the performance of the brake.

Accordingly, the present invention has been devised in view of the above-described conventional problems, and the hold down of the parking brake can prevent the shoe assembly mounted on the back plate from being detached from the back plate during transportation of the parking brake or during brake operation. The purpose is to provide a structure.

1 is a front view showing the internal configuration of a general drum parking brake

2 is a cross-sectional view taken along line A-A of FIG. 1 showing the holddown structure of the parking brake.

3 is a cross-sectional view taken along the line B-B of FIG.

4 is a front view of a parking brake showing a hold down structure according to an embodiment of the present invention;

5 is a cross-sectional view taken along the line C-C of Figure 4 showing a hold down structure of the parking brake according to an embodiment of the present invention

6 is a cross-sectional view taken along the line D-D of FIG.

Explanation of symbols on the main parts of the drawings

10 back plate 20 shoe assembly

21: brake shoe 23: coupling hole

41: Clip 45: Holddown Spring

47: turning

The present invention for achieving the above object is a parking brake of the hold down spring is fixed to the inner wall surface of the brake shoe fixed to the free end of the clip fixed to the back plate to elastically mount the shoe assembly to the back plate In the hold-down structure, a projection is formed in the hold down spring in contact with the inner wall surface of the brake shoe, the inner wall surface of the brake shoe is to provide a hold down structure of the parking brake through which the coupling hole into which the projection is inserted. .

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention in more detail as follows.

4 illustrates a parking brake to which a holddown structure is applied according to an embodiment of the present invention. This parking brake is composed of the back plate 10 and the shoe assembly 20, the wheel cylinder 30, and the brake drum 50 as in the conventional art shown in FIG. 1, and the brake shoe 21 and the brake shoe 21 thereof. A plurality of hold down structures are provided on the outer circumferential surface of the crankshaft so as to elastically install the shoe assembly 20 formed of the lining 25 in contact with the inner circumferential surface of the parking lot on the back plate 10.

Here, in the hold down structure of the parking brake according to the embodiment of the present invention, as shown in FIGS. 5 and 6, the clip 41 is bolted to the back plate 10 of the opposite side end in which the wheel cylinder 30 is installed. The hold down spring 45 is fixed to the free end of the clip 41 and is formed at the free end of the clip 41 in a wave shape to be in contact with the inner wall surface of the brake shoe 21 through the fixing piece 46. It is made of a fixed structure.

In addition, protrusions 47 protruding to the inner wall surface of the brake shoe 21 are formed at both ends of the hold-down spring 45, and coupling holes into which the protrusion 47 is inserted into the inner wall surface of the brake shoe 21 ( 23 is formed through. Accordingly, when assembling the parking brake, the protrusion 47 of the hold down spring 45 and the coupling hole 23 of the brake shoe 21 may be elastically unevenly coupled.

Referring to the operation of the hold down structure of the parking brake according to an embodiment of the present invention is configured as described above.

First, when the brake shoe 21 of the shoe assembly 20 is expanded by the driver's brake pedal operation or the parking brake operation, the brake lining 25 attached to the outer circumferential surface thereof is braked by frictional contact with the brake lining 25. In the brake operation process to generate the pressure, the hold down spring 45 is generated by the friction between the shoe assembly 20 and the brake lining 25 while elastically closely contacting the shoe assembly 20 to the back plate 10 through the contact surface. The flow of the shoe assembly 20 is reduced.

In addition, since the holddown spring 45 forms a holddown structure in a state of being engaged with the coupling hole 23 of the brake shoe 21 through the protrusion 47, the shoe assembly (up and down, left and right as well as in the axial direction) It is suppressed that the 20 is separated from the back plate 10 in place.

As described above, the present invention is formed of a structure in which the projection of the hold down spring and the coupling hole of the shoe assembly are elastically unevenly coupled to prevent the shoe assembly from being separated from the back plate during transportation or brake operation. Will be.

Therefore, the present invention can prevent the shoe assembly from being lost and reassembled as the shoe assembly is separated from the back plate in the transport process of the assembled parking brake, and the shoe assembly is separated from the brake during operation. It is possible to prevent the performance degradation of the brake in advance.

Although the present invention has been shown and described in connection with specific embodiments, it is common knowledge in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended utility model registration claims. Anyone who has a can easily know.

Claims (1)

Hold down spring in contact with the inner wall surface of the brake shoe 21 at the free end of the clip 41 fixed to the back plate 10 to elastically mount the shoe assembly 20 to the back plate 10 ( In the hold down structure of the parking brake to which 45 is fixed, a protrusion 47 is formed to protrude from the hold down spring 45 to the inner wall surface of the brake shoe 21, and the inner wall surface of the brake shoe 21 is formed. The hold down structure of the parking brake, characterized in that the through hole 23 is inserted through which the projection 47 is inserted.