KR100759884B1 - Adjuster for drum brake - Google Patents

Abstract

The present invention relates to an adjuster for a drum brake, wherein the adjuster for a drum brake according to the present invention is connected to a first and a second adjust screw through a sleeve screw, which are integrally coupled to a web, such as a sleeve member, and the like. There is no need for a separate member, and it is possible to prevent the first and second adjust screws from being separated from the web during parking braking. In addition, by linearly extending the entire length of the adjuster when the lining wears out, the required amount of wheel cylinder becomes constant and the braking response of the drum brake is improved. In addition, since the components of the adjuster are simple, manufacturing cost can be reduced.

Description

Drum Brake {ADJUSTER FOR DRUM BRAKE}             

1 is a front view of a conventional drum brake,

2 is a side view of a conventional manual adjust apparatus,

3 is a front view of a drum brake according to the present invention,

4 is a side view of a passive adjuster according to the present invention;

Figure 5 shows a perspective view of the manual adjuster device detachment prevention means according to the present invention.

* Description of the symbols for the main parts of the drawings *

30: leading shoe 40: trailing shoe

60: adjuster 61: first adjust screw

62: second adjust screw 63: insertion hole

64: sleeve screw 612, 622: one end of the adjust screw

613, 623 riveting joint

The present invention relates to a drum brake, and more particularly to a manual adjuster of the drum brake to compensate for the separation of the lining and the drum when the lining wear due to repeated braking action.

In general, a brake mounted on a vehicle is a device for decelerating, stopping or maintaining a vehicle while driving. The brake that performs this function is a method of converting the kinetic energy during driving into thermal energy by a mechanical friction device to release the frictional heat to the air to brake the hydraulic drum brake and the hydraulic disc brake.

Hydraulic drum brakes gain braking force by rubbing the cylindrical drum, which rotates with the wheel instead of the disc, with the lining. 1 is a front view showing the general structure of such a conventional drum brake.

As shown in FIG. 1, in the conventional drum brake, one end portion is in contact with and supported by the drum 1 rotating with the wheel (not shown) and the anchor block 2a fixed to the back plate 2, respectively. It consists of a pair of semi-circular brake shoes (3, 4) to operate outwardly, the wheel cylinder (5) for operating the brake shoes (3, 4) by receiving the braking hydraulic pressure.

The brake shoes 3 and 4 have linings 3a and 4a attached to the outer circumferential surface thereof, and thus exhibit braking force by friction with the inner circumferential surface of the drum 1. The brake shoes 3 and 4 again refer to the leading shoe 3 on the forward rotation direction side of the drum 1 around the wheel cylinder 5 and the trailing shoe 4 on the opposite side thereof. The leading shoe 3 and the trailing shoe 4 are coupled to the semicircular rims 3b and 4b to which the linings 3a and 4a are attached and their inner circumferential surfaces, one end of which is supported by the wheel cylinder 5 and the other end thereof. It consists of webs 3c and 4c in contact with the anchor block 2a, so that the linings 3a and 4a operate outwardly so as to rub against the inner circumferential surface of the drum 1 during braking.

Restoring springs 8 are formed at both ends of the leading shoe 3 and the trailing shoe 4, so that when the braking action is released, the leading shoe 3 and the trailing shoe 4 are removed by the elastic restoring force. Restore to position

The wheel cylinder 5 is interposed between the leading shoe 3 and the trailing shoe 4 webs 3c and 4c, and has a pair of pistons (not shown) which are advanced by braking hydraulic pressure therein. have. As shown in FIG. 2, an adjuster composed of a sleeve 6c, an adjust screw 6a, a sleeve screw 6b, and the like between the leading shoe 3 and the trailing shoe 4 webs 3c and 4c. An intervener 6 is interposed, which extends its length by manually rotating the sleeve 6c by rotating and loosening the adjust screw 6a screwed with the sleeve screw.

Accordingly, when the linings 3a and 4a are excessively worn due to repeated braking action, the adjuster 6 is released to compensate for the gap with the inner peripheral surface of the drum 1, and the structure of the adjuster 6 is further improved. The detailed description is as follows.

First, one end of the adjust screw 6a is fitted into the web 3c of the leading shoe 3, and at this time, the sleeve 6c has one end of the adjust screw 6a made of a screw shaft having a male thread. The outer circumferential surface and the trailing shoe 4 web 4c on which the operating lever for the power brake are provided are freely fitted and engaged. The operating lever for the parking brake is axially coupled to the trailing shoe 4 and the other end is connected to the parking brake lever (not shown) provided next to the driver's seat via a cable (not shown). Is performed. The sleeve 6c is screwed into the screw shaft of the adjust screw 6a, preventing the screw shaft of the adjust screw 6a from being inserted into the hollow of the sleeve screw 6b anymore.

Here, in detail look at the coupling state of the conventional brake shoes (3, 4) and the adjuster (6), the brake shoes (3, 4), the shoe rim (3b, 4b) and the shoe web (3c, 4c) is T-shaped Joined in the cross section of the shape, and consists of a configuration in which the lining (3a, 4a) is attached to the outside of the shoe rim (41). Notched grooves are formed at both ends of the shoe webs 3c and 4c to contact the notched grooves 6d of the sleeve 6c of the adjuster 6 so that the adjuster 6 is connected to the shoe webs 3c and 4c. To prevent them from leaving.

However, the gap between the shoe webs 3c and 4c becomes larger than the length of the adjuster 6 during parking braking so that the sleeve 6c connecting the sleeve screw 6b is pulled out so that the adjuster 6 detaches. A problem arises.

The present invention is to solve this problem, by adjusting the screw screw or riveting to the leading shoe and the trailing shoe, respectively, to form a single structure, the web gap that can occur by drum brake braking This is to prevent the deviating phenomenon of the adjuster.

     In order to achieve the above object, the present invention provides a drum that rotates together with a wheel and a lining is attached to maintain a constant distance from the drum inner circumferential surface, and the lining is frictionally acted on the drum inner circumferential surface during braking operation to exert braking force. When one end is coupled to the shoe, the trailing shoe, and the leading shoe, and the other end is coupled to the trailing shoe, and the braking action is released, the lining restores the leading shoe and the trailing shoe so that the lining maintains a constant distance from the drum. In the drum brake having an adjuster for compensating the separation distance between the drum and the lining when both ends are coupled between the spring, the leading shoe and the trailing shoe, the wear of the lining,

The adjust device,

A first adjust screw, one end of which is screwed or riveted to the leading shoe and the other end of which is inserted into the insertion hole with a predetermined screw thread, the other end of which is screwed or riveted to the trailing shoe, and the other end of which is A second adjust screw inserted into the insertion hole at a predetermined depth with a threaded screw shaft, and an insertion hole into which the first and second adjust screws are inserted, and rotate on the first and second adjust screws It characterized in that it comprises a sleeve screw for adjusting the spacing of the leading shoe and the trailing shoe.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. 3 is a front view showing the overall structure of the drum brake according to the present invention, Figure 4 is a side view of the adjuster according to the present invention.

3 and 4, the drum brake according to the present invention is configured such that the cylindrical drum 10 rotates together with a wheel (not shown), and is operated outwardly at the edge of the back plate so that the drum 10 A pair of brake shoes 30 and 40 with linings 31 and 41 attached to friction with the inner circumferential surface of the < RTI ID = 0.0 >), < / RTI > The built-in wheel cylinder 50 and the like.

The brake shoes 30 and 40 are configured such that one end thereof is supported by the anchor block 21 and the other end thereof is in contact with the wheel cylinder 50, and that the side of the drum 10 in the forward rotation direction thereof is the leading shoe 30, The opposite side is referred to as the trailing shoe 40. The leading shoe 30 and the trailing shoe 40 have a “T” shape in cross section, and a semicircular rim to which linings 31 and 41 are attached to an outer circumferential surface thereof, and an inner circumferential surface of the rim, which is coupled to one end by a welding means. The other end is made of plate-shaped webs 33 and 43 supported by the anchor block 21 and in contact with the piston tip embedded in the wheel cylinder 50.

On the other hand, when the linings 31 and 41 are worn due to the continuous braking action, the separation distance from the inner peripheral surface of the drum 10 increases, and the adjuster 60 which compensates for this and maintains a constant interval at all times is a leading shoe ( 30) and the trailing shoe 40 is interposed. The adjuster 60 has a function of compensating the gap between the linings 31 and 41 and the drum 10, and the leading shoe 30 and the trailing shoe 40 are operated outwards, thereby making the parking brake action. To lose. Its detailed structure is as follows.                     

As shown in FIGS. 3 and 4, the adjuster device 60 according to the present invention includes a first adjust screw 61 and a second end of which each end is in contact with and supported by the leading shoe 30 and the trailing shoe 40. A hollow sleeve threaded to form an adjust screw 62 and an insertion hole 63 into which they are inserted to connect them, and to be rotatably coupled to the inner circumferential surface on the first and second adjust screws 61 and 62. Screw 64.

One end portion 611 of the first adjust screw 61 is integrally coupled to the web 33 of the leading shoe 30 by screwing or riveting, and the other end 612 is the hollow sleeve. It is inserted into the insertion hole 63 of the screw 64 by a predetermined depth. In addition, the other end portion 612 is provided with a male threaded portion corresponding to the female threaded portion of the insertion hole 63 to be coupled to a predetermined depth inside the insertion hole 63. The second adjust screw 62 has one end 621 integrally coupled to the web 43 of the trailing shoe 40 by screwing or riveting, and the other end 622 of the hollow sleeve. It is inserted into the insertion hole 63 of the screw 64 by a predetermined depth. The other end portion 612 is provided with a male threaded portion corresponding to the female threaded portion of the insertion hole 63 to be coupled to a predetermined depth inside the insertion hole 63.

As shown in FIG. 5, the first and second adjust screws 61 and 62 are rod-shaped, and an engaging portion engaging with the leading shoes 30 and the webs 33 and 43 of the trailing shoe 40 ( 613 and 623 are pressed by press working to form a plate shape so as to facilitate riveting and screwing with the webs 33 and 43. The sleeve screw 64 has a hollow cylindrical shape, and has an insertion hole 613 in the inner circumferential surface with a margin, and the first and second adjust screws 61 and 62 are previously spaced apart by a predetermined interval so that the first And the second adjust screws 61 and 62 are inserted into and coupled to the insertion holes 63 of the sleeve screw 64 so as to be slid left and right inward so that the adjuster 60 is outwardly of the web when the lining is worn by the braking operation. It can be elongated to compensate for the clearance gap, and the outer circumferential surface constitutes a spiral shaft 632 machined with a male thread to rotate the sleeve screw 64. However, only one of the first and second adjust screws may be externally threaded.

Looking at the operation structure of the sleeve screw 64 and the first and second adjust screws, when the helix shaft of the sleeve screw 64 is rotated in the direction of arrow A, one end 622 of the rod-shaped second adjust screw 62 is formed. R) is coupled in the right screw direction, one end 612 of the first adjust screw 61 is rotated in the left screw direction little by little from the insertion hole 63, the overall length of the adjuster device 60 is linear Is elongated.

Next, the braking action of the drum brake according to the present invention configured as described above will be described.

First, before the driver presses the brake pedal (not shown), the disk spring is kept in the maximum compressed state by the elastic force of the restoring spring 80. When the brake pedal is pressed, the master cylinder (not shown) is pressed. Braking hydraulic pressure generated in (not shown) is transferred to the wheel cylinder 50, and the piston (not shown) is advanced. Therefore, when the leading shoe 30 and the trailing shoe 40 operate outwardly about the anchor block 21, the braking force is generated by friction with the inner circumferential surface of the drum 10 on which the linings 31 and 41 rotate.

If the linings 31 and 41 gradually wear due to the repeated braking action, when the outward working width of the leading shoe 30 and the trailing shoe 40 increases, the sleeve 64 is rotated in the direction of arrow A to adjust the By extending the overall length of the device 60, the gap between the linings 31 and 41 and the inner peripheral surface of the drum 10 is always kept constant.

In this operation, even when the drum brake is used for a long time, the same braking response can be felt as in the initial state, thereby improving the reliability of the overall braking system.

As described in detail above, the adjuster of the drum brake according to the present invention is connected to the first and second adjuster screw through the sleeve screw and they are integrally combined with the web to require a separate member such as the sleeve member. The first and second adjust screws may be prevented from escaping from the web during parking braking. Further, by linearly extending the overall length of the adjuster when the lining wears out, the required amount of wheel cylinder becomes constant and the braking response of the drum brake is improved. In addition, since the components of the adjuster are simple, manufacturing cost can be reduced.

Claims (4)

delete The drum 10 rotates with the wheel, and linings 31 and 41 are attached to maintain a constant distance from the inner circumferential surface of the drum 10. The linings 31 and 41 rub against the inner circumferential surface of the drum 10 during braking operation. When one end is coupled to the leading shoe 30, the trailing shoe 40, the leading shoe 30, and the other end is coupled to the trailing shoe 40 to release the braking action to exert braking force by the lining Restoring spring 80 for restoring the leading shoe 30 and the trailing shoe 40 so that 31 and 41 maintain a constant distance from the drum 10, the leading shoe 30 and the trailing shoe ( 40 is a drum brake having an adjuster (60) that is coupled between both ends to compensate for the separation distance between the drum (10) and the lining (31, 41) when the wear of the lining (31, 41) , The adjust device 60, Each end forms a first adjust screw 61 and a second adjust screw 62 and insertion holes 63 into which they are contacted and supported by the leading shoe 30 and the trailing shoe 40 to connect them. A hollow sleeve screw 64 threaded to be rotatably coupled on the first and second adjust screws 61, 62 to the inner circumferential surface, The first and second adjust screws 61 and 62 have one ends 612 and 622 by screwing or riveting the webs 33 and 43 of the leading shoe 30 and the trailing shoe 40. Drum brakes, characterized in that integrally coupled. The method of claim 2, A male thread machining portion corresponding to the female thread machining portion of the insertion hole 63 is formed such that the other ends of the first and second adjust screws 61 and 62 are coupled to a predetermined depth inside the insertion hole 63. Drum brake made with. The method of claim 2, End portions 612 and 622 of the first and second adjust screws are plate-like engaging portions for screwing or riveting the leading shoes 30 and the webs 33 and 43 of the trailing shoe 40 ( 613, 623).

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