KR20160094751A - Drum brake for vehicle - Google Patents

Abstract

According to the present invention, a drum brake for a vehicle has a pair of brake shoes coupled to the external surface of a back plate to be moved outwards by a hydraulic force to generate a frictional force with a brake drum, and a return spring to return the brake shoes. More specifically, the drum brake for a vehicle comprises: a hanging groove concavely formed on the internal surface of the brake shoes; and a position alignment unit installed for a front end thereof to appear on the external surface of the back plate, left from the hanging groove when the brake shoes are moved outwards, and inserted into the hanging groove when the brake shoes return, so as to align the brake shoes in a reference position. According to the present invention, unnecessary contact between a brake shoe and a brake drum can be prevented.

Description

[0001] DRUM BRAKE FOR VEHICLE [0002]

The present invention relates to a vehicle drum brake, and more particularly, to a brake drum for a vehicle, more specifically, a brake drum of a brake drum and a brake drum, in which, when brake shoes are returned to a standby position by a return spring, And more particularly, to a vehicle drum brake capable of preventing drag interference of the vehicle.

Generally, a brake mounted on a vehicle is a device for decelerating or stopping or stopping a vehicle while driving.

These brakes are drum-type hydraulic brakes and disk-type hydraulic brakes, which change the kinetic energy during running to thermal energy by a mechanical friction device and release the frictional heat thereof to the atmosphere.

Among them, the drum brake strongly presses the cylindrical drum, which rotates together with the wheel of the wheel, with the lining pad to obtain the braking force.

A conventional drum brake for this purpose is composed of a pair of brake shoe which is installed on the outer surface of the back plate and operates outwardly, and a cylinder operated by hydraulic pressure transmitted from the brake pedal.

A return spring for returning the outwardly actuated brake shoe to its original position is constituted by a return spring and a lining pad which is in contact with the inner surface of the brake drum in a state of being attached to the pressing surface of the brake shoe and generates braking force by friction.

When the brake pedal provided on the driver's seat of the vehicle is depressed, hydraulic pressure is transmitted to the cylinder by an external force applied to the pedal, and a pair of brake shoes are moved outwardly by driving of the cylinder, Thereby generating a braking force.

However, there is a fear that the drum brake is returned to the stand-by position by the return spring and is released by the external impact or the like and is out of the correct position. In this case, unnecessary drag interference between the lining pad of the brake shoe and the brake drum may occur, which may result in lower fuel efficiency of the vehicle and noise during operation of the vehicle.

Prior art related to the present invention is Korean Patent Laid-Open No. 10-2009-0125531 (December 07, 2009), which discloses a vehicle drum brake.

In the present invention, since the brake shoe is aligned in the correct position without flow when returning to the standby position by the elastic force of the return spring, unnecessary contact (drag) of the brake shoe and the brake drum can be prevented in a state in which braking is not performed, And to provide a vehicle drum brake capable of reducing unnecessary noise and improving fuel economy of a vehicle.

A vehicle drum brake according to the present invention comprises a pair of brake shoes coupled to an outer surface of a back plate and driven outward by oil pressure to generate frictional force with the brake drum and a return spring for returning the brake shoes, The brakes according to any one of claims 1 to 3, wherein the braking shoe is provided with an engaging groove recessed on the inner surface of the brake shoe, and a tip end protruding from an outer surface of the back plate, the braking shoe being detached from the engaging groove when the brake shoe is moved outward, And a positioning part inserted in the engaging groove to align the brake shoe with a reference position.

The positioning unit includes a tubular body protruding from an outer surface of the back plate and having a hollow therein, an elastic member provided inside the hollow to exert a compressive force, and an elastic member supported by the elastic member, And a protruding and outward end protruding outwardly is provided in the latching groove so as to be removable.

One end of the tubular body may be detachably coupled to the outer surface of the back plate either integrally or by a fastening member.

A distal end of the protruding and retracting member forms a curved surface or a hemispherical surface, and an outer surface of the protruding and retracting member is hooked on an end of the protruding and retracting member so as to protrude .

In addition, a guide groove having a length along the projecting / retracting direction is further formed on the outer surface of the protruding / retracting member, and a projected tip is inserted into the hollow to restrict the protruding / A guide projection may be further provided.

In addition, the latching groove may be formed with an inclined or curved guide surface along the entrance edge of the protruding / retracting member.

The present invention makes it possible to prevent the drag interference of the brake shoe and the brake drum in a state in which the pedal for braking is not performed by making the brake shoe return to the standby position by returning to the standby position, Thus, unnecessary noise can be reduced and the fuel consumption of the vehicle can be improved.

1 is a perspective view showing a drum brake for a vehicle according to the present invention.
2 is a cross-sectional view showing a drum brake for a vehicle according to the present invention.
FIG. 3 is a cross-sectional view illustrating a position aligning part in a vehicle drum brake according to the present invention in detail.
FIG. 4 is a cross-sectional view illustrating the operation of the position aligner when braking in the vehicle drum brake according to the present invention.
5 is a cross-sectional view illustrating a state in which a latching end is formed in a vehicle drum brake according to the present invention.
6 is a cross-sectional view illustrating a state in which guide grooves and guide protrusions are formed in a vehicle drum brake according to the present invention.
7 is a cross-sectional view showing a state in which a guide surface is formed in a vehicle drum brake according to the present invention.

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

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

FIG. 1 is a perspective view showing a drum brake for a vehicle according to the present invention, and FIG. 2 is a sectional view showing a drum brake for a vehicle according to the present invention.

FIG. 3 is a cross-sectional view showing a detailed arrangement of a position alignment unit in a vehicle drum brake according to the present invention, and FIG. 4 is a sectional view showing an operation of a position alignment unit in braking in a vehicle drum brake according to the present invention.

1 to 4, a vehicle drum brake according to the present invention may include a back plate 10, a brake drum 20, a brake shoe 30, and a return spring 40.

An operation lever operated by hydraulic pressure transmitted from the brake pedal and a wheel cylinder for generating a driving force interlocked with the operation lever may be provided.

Particularly, in the drum brake for a vehicle according to the present invention, the engagement groove 100 formed in the brake shoe 30 and the positioning portion 200 are provided.

The brake drum 20 is rotated together with the wheel of the wheel while being disposed on the outer surface of the back plate 10 and a pair of brake shoes 30 are movably disposed inside the brake drum 20 .

The pair of brake shoe (30) is installed on the outer surface of the back plate (10) fixed to the axle so as to be movable outwardly and returnably.

Here, the pair of brake shoes 30 are arranged to correspond to each other and can be moved in directions opposite to each other by the operation of the cylinder.

1 and 2, the lining pad 50 is attached to the outer surface of the brake shoes 30 by the outward movement of the brake shoes 30 when the driver pads the vehicle. And is brought into close contact with the inner surface of the brake drum 20 to generate a braking force.

When the driver releases pedaling, the brake shoe 30 is returned to its original position by the tensile force of the return spring 40, and at the same time, the lining pad 50 is separated from the inner surface of the brake drum 20.

The engaging groove 100 is recessed in the inner surface of the brake shoe 30 and forms a space in which the tip of the protruding and retracting member 230 to be described later can be correspondingly inserted and removed.

The engaging groove 100 may be formed to penetrate in both directions of the brake shoe 30. The engaging groove 100 may have a shape and size corresponding to the tip of the protruding member 230, .

Of course, the shape and size of the latching groove 100 can be variously modified as needed, and the position of the latching groove 100 can be changed to a position corresponding to the laterally-detaching member 230, which will be described later.

The latching grooves 100 may be formed in the pair of brake shoes 30 and the position aligning part 200 to be described below may also be provided in a corresponding number to the latching grooves 100.

The position aligning unit 200 is detachably attached to the outer surface of the back plate 10 so that the tip of the aligning unit 200 is detachable from the engaging groove 100 when the brake shoe 30 moves outward.

On the other hand, the connecting end of the positioning unit 200 may be inserted into the latching groove 100 when the brake shoe 30 is returned to align the brake shoe 30 to the reference position.

Here, the reference position of the brake shoe 30 refers to a position spaced apart from the brake drum 20, and may be set differently depending on the installation position.

The position alignment unit 200 may include a tubular body 210, an elastic member 220, and a protruding and retracting member 230.

The tubular body 210 protrudes from the outer surface of the back plate 10 as shown in FIG. 2, and a hollow 211 is formed inside the tubular body 210.

Here, the tubular body 210 may have a cylindrical shape, and one end of the hollow 211 may be opened to an extended end of the tubular body 210.

One end of the tubular body 210 may be detachably coupled to the outer surface of the back plate 10 by a single body or a fastening member (such as a bolt).

For example, when one end of the tubular body 210 is integrally formed on the outer surface of the back plate 10, the tubular body 210 may be integrally formed or integrally formed by a separate welding process.

Alternatively, when the tubular body 210 is detachably attached to the tubular body 210 by the fastening member B, the position of the tubular body 210 can be easily varied according to the position of the fastening groove 100 described above.

The elastic member 220 is installed in the hollow 211 formed inside the tubular body 210 and can generate a compressive elastic force along the longitudinal direction of the hollow 211.

Here, the elastic member 220 may be a coil spring type as shown in FIG. 3, but a plate spring type or the like can also be used.

4, when the external force is applied to the protruding / retracting member 230 in a state of elastically supporting one end of the protruding / retracting member 230 as described later, the elastic member 220 may be compressed and reduced in length.

The protruding and retracting member 230 is supported at one end by the elastic member 220 and the distal end protruding outwardly of the hollow 211 can be inserted into and removed from the latching groove 100 described above.

Here, the protruding and retracting member 230 may have a curved surface or hemispherical surface 231 protruding outward from the hollow 211.

2 to 5, only the distal end projecting outwardly of the hollow 211 as shown in FIG. 6 has a curved or hemispherical shape and is located in the hollow 211 May be formed in a cylindrical shape.

5, a hooking end 212 for hooking and supporting the outer surface of the protruding member 230 in the insertion direction may be further formed at the tip of the tube 210 described above.

Since the engaging end 212 supports the tip of the protruding and retracting member 230 in the hollow 211 direction, it is possible to restrict the protruding and retreating distance of the protruding and retracting member 230.

Here, the engaging end 212 may protrude in a ring shape so that the tip of the protruding and retracting member 230 may be wound with a smaller diameter.

Of course, the latching end 212 may be formed as one or a plurality of protrusions so as to support the latching member 230 locally without wrapping the protrusion 230.

Alternatively, the outer circumferential surface of the protruding member 230 may have a guide groove 232 having a length along the protruding direction as shown in FIG.

In addition, a guide protrusion 213 may be further protruded in the hollow 211 formed inside the tube 210.

The guide protrusion 213 can restrict the protruding and protruding distance of the protruding and retracting member 230 in a state where the protruding end is inserted into the guide groove 232.

7, the engaging groove 100 may be further formed with a guide surface 110 having an inclined or curved shape along the entrance edge where the protruding / retracting member 230 is inserted / removed.

The guide surface 110 may smoothly guide the hemispherical surface 231 of the protruding and retracting member 230 so that no shock or noise occurs when the hemispherical surface 231 is inserted or removed.

As a result, according to the present invention, when the brake shoe 30 is returned to the standby position, the brake shoe 30 is brought into contact with the brake drum 20 in a state in which pedaling for braking is not performed, (Drag) interference can be prevented, thereby making it possible to reduce unnecessary noise while improving the fuel efficiency of the vehicle.

Although the embodiment of the drum brake for a vehicle according to the present invention has been described above, it is apparent that various modifications are possible within the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

10: back plate 20: brake drum
30: Brake shoe 40: Return spring
50: lining pad 100:
110: guide surface 200:
210: tube 211: hollow
212: Retaining end 213: Guide projection
220: elastic member 230: protruding / retracting member
231: hemispherical surface 232: guide groove
B: fastening member

Claims (6)

A pair of brake shoes coupled to an outer surface of the back plate and driven outward by oil pressure to generate frictional force with the brake drum, and a return spring for returning the brake shoes,
An engaging groove formed concavely on the inner surface of the brake shoe; And
Wherein the brake shoe is detachable from the latch groove when the brake shoe moves outwardly and is inserted into the latch groove when the brake shoe is returned to align the brake shoe to the reference position; And a drum brake for a vehicle. The method according to claim 1,
Wherein the position-
A tubular body projecting from an outer surface of the back plate and having a hollow therein,
An elastic member installed inside the hollow to apply a compressive force,
And a projecting / retracting member supported by the elastic member and having a distal end projecting to the outside of the hollow, the retracting member being removably installed in the engaging groove. The method of claim 2,
One end of the tubular body,
And is detachably coupled to an outer surface of the back plate by an integral member or a fastening member. The method of claim 2,
The tip of the protruding /
Forming a curved or hemispherical surface,
At the tip of the tube,
Wherein a protruding end portion of the protruding / retreating member is formed to protrude to limit the protruding / retreating distance of the protruding / retreating member. The method of claim 2,
On the outer surface of the protruding /
A guide groove having a length along the direction of the protruding /
Inside the hollow,
And a protruding end is inserted into the guide groove to limit a protruding / retracting distance of the protruding / retracting member. The method of claim 2,
The engaging groove
Wherein a guiding surface in the form of an inclined or curved surface is further formed along the entrance edge of the protruding / retreating member.

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