KR19990032143U - Drum brake of car brake system - Google Patents

Abstract

The present invention relates to a drum brake of a vehicle brake device, the object of which is to improve the second restoring spring and the anchor block to facilitate the operation of the parking lever and its assembly.

The drum brake of the brake device for a vehicle according to the present invention has both ends fixed to the ends of the leading shoe 30a and the trailing shoe 30b so that the second restoring spring 62 for restoring them is located at the bottom of the anchor block 80. Installed. Accordingly, there is an advantage that the operation of the parking operation lever 70 and its assembly are not interfered with by the second restoration spring 62. In addition, by configuring both ends of the anchor block 80 in which the ends of the leading shoe 30a and the trailing shoe 30b are in contact with each other is prevented from sagging downward by the elastic restoring force of the second restoring spring 62. do.

Description

Drum brake of car brake system

The present invention relates to a drum brake of a brake device for a vehicle, and more particularly, to an anchor block and a restoring spring for restoring the brake shoe, the brake shoe is supported outwardly.

In general, a brake device mounted on a vehicle is for decelerating or stopping or maintaining a stopped vehicle. The brake device having such a function converts the kinetic energy during driving into thermal energy by a mechanical friction device and releases its dead heat in the air and brakes, such as a drum hydraulic brake and a disk hydraulic brake.

Drum-type hydraulic brake is to obtain a braking force by rubbing the cylindrical drum that rotates with the wheel instead of the disk in the lining therein, Figure 1 is a front view showing the overall structure of such a drum brake.

As shown in the related art, a conventional drum brake includes a pair of semi-circular brake shoes 3a and 3b, each of which has one end supported by a wheel cylinder 4 to be described later, and thereby outwardly operated. The brake shoes 3a, On the outer circumferential surface of 3b) is attached a lining 3e which generates a braking force by friction with the inner circumferential surface of the drum 1 which rotates together with the wheel (not shown) during braking.

The brake shoes 3a and 3b distinguish the ones on the side of the forward rotation direction of the drum 1 around the wheel cylinders 4 as the leading shoes 3a and those provided on the opposite side as the trailing shoes 3b. These are coupled to the semicircular rim 3d to which the lining 3e is attached, the inner circumferential surface of the rim 3d, one end of which is supported by a piston (not shown) of the wheel cylinder 4, and the other end of the back plate ( It consists of a plate-shaped web (3c) which is installed in contact with the anchor block (8) fixed to 2), the lining (3e) of the drum (1) by pushing the plate-like web (3c) to the outside during braking action It will rub against the inner circumferential surface. That is, when braking hydraulic pressure is transmitted to the wheel cylinder 4 in which a pair of pistons (not shown) are built, the piston (not shown) moves outward and the leading shoe 3a and trailing shoe 3b are pushed outward. To generate a braking force. At this time, the other end of the leading shoe 3a and the trailing shoe 3b is in contact with the anchor block 8 and rotates about it.

On the other hand, restoring springs 6a and 6b are provided for restoring the leading shoe 3a and the trailing shoe 3b when the braking action is released. The restoring springs 6a and 6b are divided into a first restoring spring 6a installed at an upper portion and a second restoring spring 6b provided at a lower portion thereof. The first restoring springs 6a have both ends of the trailing shoe 3b. It is fixed to one end and one end of the leading shoe 3a, respectively. Both ends of the second restoring spring 6b are fixed to the other end of the trailing shoe 3b and the other end of the leading shoe 3a, respectively, to restore the leading shoe 3a and the trailing shoe 3b due to their elastic restoring force. Let's do it.

In addition, there is a parking operating lever 7 whose front end is rotatably coupled to the shaft 7a at one end of the trailing shoe 3b and the web 3c. The rear end of the operating lever 7 is provided at one side of the driver's seat. It is connected via a brake lever (not shown) and a cable (not shown). Reference numeral 7b is a fastener for connecting a cable (not shown).

In addition, between the leading shoe 3a and the trailing shoe 3b, the lining 3e is over-weared according to the continuous braking action, and an adjuster 5 is provided to compensate for the increase in separation from the inner peripheral surface of the drum 1, The left end is coupled to the web 3c of the leading shoe 3a and the right end is coupled to the parking operation lever 7. Accordingly, when the parking brake lever (not shown) provided on one side of the driver's seat is pulled, the other end of the operating lever 7 is pulled together by a cable (not shown), and at the same time, the web 3c of the leading shoe 3a is pulled out. By pushing toward the drum 1, the adjuster 5 is also moved in the pulling direction until the lining 3e provided on the outer circumferential surface of the rim 3d rubs against the drum 1 and brakes. When the adjuster 5 is no longer moved, the web 3c of the trailing shoe 3b is pushed toward the drum 1 side by the principle of the lever, so that the lining 3e is in contact with the drum 1 and parked. Will brake for. When the parking brake lever (not shown) provided in the driver's seat is released again, the leading shoe 3a and the trailing shoe 3b are restored to their original positions by the elastic force of the first and second restoration springs 6a and 6b.

However, in the conventional drum brake, the second restoring spring 6b is positioned above the anchor block 8 and is adjacent to the rear end of the parking lever 7. Therefore, when the cable (not shown) is connected to the fixing member 7b of the rear end of the operating lever 7, the assembly is difficult, and the rear end of the operating lever 7 contacts the second restoring spring 6b. It does not work smoothly.

In particular, in the case of the drum brake for controlling the four-wheel drive vehicle, there is a lack of space for connecting a cable (not shown) to the parking operation lever 7 by the second restoring spring 6b positioned above the anchor block 8. The phenomenon is noticeable.

The present invention is to solve this problem, the main purpose of the present invention is to fix the second restoring spring to restore the leading shoe and trailing shoe to be located in the lower portion of the anchor block to interfere with the operation of the parking operation lever and its assembly. It is to provide a drum brake of a vehicle brake device that is not given.

And a second object of the present invention is to configure the both ends of the anchor block that the end of the leading shoe and trailing shoe in contact with the inclined outward to prevent the drum brake of the vehicle brake device to prevent sagging down by the elastic restoring force of the second restoring spring To provide.

Figure 1 shows the overall structure of a conventional drum brake.

Figure 2 is a front view schematically showing the overall structure of the drum brake according to the present invention.

3 is an enlarged view showing an extract of the anchor block and the lower restoring spring according to the present invention.

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

10. Drum 30a. Reading shoe 30b. Trailing shoe

62. Second restoration spring 70. Operation lever 72. Fixture

80. Anchor block 81. Slope 82. Fixed rivet

The present invention for achieving this object is interposed between the leading and trailing shoes, trailing shoes, trailing shoes and trailing shoes with a lining is attached to the drum rotating together with the wheel, the inner peripheral surface of the drum to brake Anchor block in which the leading shoe and the trailing shoe operate outwardly, one end of which is axially coupled to the trailing shoe and the parking operation lever for actuating it outwardly, the first restoring spring fixed at both ends of the leading shoe and the trailing shoe to restore it. In the drum brake of the brake device for a vehicle having a second restoring spring fixed at both ends of the leading shoe and the trailing shoe to restore it,

The second restoring spring is fixed at one end to the other end of the leading shoe, and the other end is coupled to the other end of the trailing shoe by turning the bottom of the anchor block so as not to interfere with the operation lever.

Both ends of the anchor block is characterized by consisting of an inclined surface inclined outward to prevent the other end of the leading shoe and the other end of the trailing shoe to sag downward.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Figure 2 is a front view showing the overall structure of the drum brake according to the present invention, Figure 3 is an extract showing the fastening structure and anchor block of the second restoring spring according to the present invention.

The drum brake of the brake device for a vehicle according to the present invention has a cylindrical drum 10 which rotates together with a wheel (not shown) as shown in the drawing, and is braked on both sides of the edge of the back plate 20. The lining 33 is attached to the outer circumferential surface to friction with the inner circumferential surface of the drum 10, and is composed of a pair of brake shoes 30a and 30b having a semicircular shape. The brake shoes 30a and 30b are classified into a leading shoe 30a provided on the forward rotation direction side of the drum 10 and a trailing shoe 30b provided on the opposite side thereof, which has a cross section having a “T” shape. It is. That is, the leading shoe 30a and the trailing shoe 30b are integrally coupled to the rim 32 having a predetermined curvature and its inner circumferential surface so that the lining 33 is attached to the outer circumferential surface, respectively, and one end thereof is embedded in the wheel cylinder 40. It consists of a plate-shaped web 31 which is in contact with a piston (not shown) and is provided so that the other end is in contact with the end of the anchor block 80. The anchor block 80 is interposed between the leading shoe 30a and the other end of the trailing shoe 30b so that the brake shoes 30a and 30b operate outwardly. That is, when the braking hydraulic pressure is transmitted to the wheel cylinder 40 and the built-in piston (not shown) is advanced, the web 31 rotates outwardly about the anchor block 80 so that the lining 33 is the drum 10. It is to be rubbed with the inner peripheral surface of.

In addition, restoring springs 61 and 62 are provided to restore the leading shoe 30a and the trailing shoe 30b when the braking pressure is released. The lining 33 is immediately separated from the drum 10 to prevent unnecessary friction. do. The restoring springs 61 and 62 are divided into a first restoring spring 61 installed at an upper portion and a second restoring spring 62 provided at a lower portion thereof. Both ends of the first restoring spring 61 are fixed to one end of the leading shoe 30a and the trailing shoe 30b, that is, the upper end. Both ends of the second restoring spring 62 are fixed to the lower ends of the leading shoes 30a and the trailing shoe 30b, respectively, and are coupled to surround the lower portion of the anchor block 80. Therefore, the upper portion of the anchor block 80 is secured a space for installing a separate component. At this time, since the center of the second restoring spring 62 is located below the anchor block 80, the leading shoe 30a and the trailing shoe 30b may sag downward. Both ends are comprised by the inclined surface 81 which inclined outward, and is prevented.

That is, the anchor block 80 is fixed to the upper surface of the back plate 20 using a fixing rivet 82, and the other end of the leading shoe 30a and the trailing shoe 30b web 31 at both ends thereof. The part which abuts each contact is comprised by the inclined surface 81 inclined widely outward. Therefore, the other end of the web 31 is prevented from sagging downward due to the elastic restoring force of the second restoring spring 62.

On the other hand, an adjuster 50 is provided between the leading shoe 30a and the trailing shoe 30b, and is configured to compensate for a large distance from the inner peripheral surface of the drum 10 due to abrasion of the lining 33, and one end thereof is trailed. One end of the ring shoe 30b is coupled to the shaft 71 and the parking operation lever 70 connected with a parking brake lever (not shown) and a cable (not shown) provided at one side of the driver's seat through a fixture 72 formed at the other end. ) Is installed. At this time, when the driver pulls the parking brake lever (not shown), at the same time, the operating lever 70 and the adjuster 50 are interlocked in the same direction so that the lining 33 of the leading shoe 30a is connected to the drum 10. It generates friction by rubbing against the inner circumferential surface. And when it is no longer moved, the web 31 of the trailing shoe 30b coupled to the front end of the operating lever 70 and the shaft 71 is pushed toward the drum 10 by the principle of the lever, so that the lining 33 is drummed. The friction is caused by friction with the inner circumferential surface of (10). When the driver releases the parking brake lever (not shown), the leading shoe 30a and the trailing shoe 30b are restored to their original positions by the first restoring spring 61 and the second restoring spring 62.

It describes the operation of the drum brake according to the present invention configured as described above. First, when the vehicle is running, the drum 10 also rotates together with a wheel (not shown). In this state, when the driver steps on the brake pedal (not shown), a braking hydraulic pressure is formed in the master cylinder (not shown) and transferred to the wheel cylinder 40 through the hydraulic line (not shown). Accordingly, as the piston (not shown) built in the wheel cylinder 40 is advanced, the leading shoe 30a and the trailing shoe 30b are operated outwardly about the anchor block 80 so that the lining 33 is rotated. The friction with the inner circumferential surface of the drum 10 is a braking action. When the brake pedal is released by releasing the brake pedal (not shown), the leading shoe 30a and the trailing shoe 30b are in the original position by the elastic restoring force of the first restoring spring 61 and the second restoring spring 62. Return to

Meanwhile, in the case of parking, the braking action is as follows. When the driver pulls the parking brake lever (not shown), it is connected to the rear end of the parking operation lever 70 through a cable (not shown) so that the assist 50 is interlocked with the operation lever 70. . Accordingly, the leading shoe 30a is pushed outward so that the lining 33 rubs against the inner circumferential surface of the drum 10, and the trailing shoe 30b is pushed to the opposite side and braked due to the principle of the lever.

As described above, the braking action during the parking is performed through a cable (not shown) coupled to the fixture 72 of the parking operation lever 70, and the upper portion of the anchor block 80 where the cable (not shown) is located. The space for mounting the parts is formed wide, so that the installation and operation thereof are easily performed.

In addition, the second restoring spring 62 is installed at the lower portion of the anchor block 80, and a force that pulls the leading shoe 30a and the trailing shoe 30b downward acts, and both ends of the anchor block 80 are outward. The leading shoe 30a and the trailing shoe 30b are prevented from sagging by the force of the second restoring spring 62 made of the inclined surface 81.

As described above in detail, the drum brake of the brake device for a vehicle according to the present invention is installed so that both ends are fixed to the ends of the leading shoe and the trailing shoe so that the second restoring spring is located below the anchor block. Accordingly, there is an advantage that the operation of the parking operation lever and its assembly are not interfered by the second restoration spring. In addition, by configuring both ends of the anchor block in which the ends of the leading shoe and the trailing shoe in contact with each other are inclined outwardly, sagging downward by the elastic restoring force of the second restoring spring is prevented.

Claims (1)

The drum 10 rotating together with the wheel, the leading shoe 30a and trailing shoe 30b having the lining 33 attached to the inner peripheral surface of the drum 10 to brake with the brake 10a, and the leading shoe 30a. An anchor block 80 interposed between the ends of the trailing shoe 30b and operating with the leading shoe 30a and the trailing shoe 30b outward, and one end of the shaft 71 in the trailing shoe 30b. Parking operation lever (70) coupled to operate outward, both ends are fixed to one end of the leading shoe (30a) and the trailing shoe (30b) restoring the first restoring spring (61), both ends of the In the drum brake of the brake device for a vehicle having a second shoe spring (62) fixed to the other end of the leading shoe (30a) and the trailing shoe (30b) to restore it, The second restoration spring 62 has one end fixed to the other end of the leading shoe 30a and the other end of the trailing shoe 80 by turning the lower portion of the anchor block 80 so as not to interfere with the operation lever 70. Coupled to the other end of 30b), Both ends of the anchor block 80 is made of an inclined surface 81 inclined outward so as to prevent the other end of the leading shoe 30a and the other end of the trailing shoe 30b to sag downward. Drum brake of vehicle brake system.