KR20110034973A - Parking brake system for trailer vehicle - Google Patents

Abstract

PURPOSE: A parking brake system for a trailer vehicle is provided to increase operating force and link operation stroke since a left link and a right link are spot-symmetrical. CONSTITUTION: A parking brake system for a trailer vehicle comprises a drum, left and right brake shoes(30,31), left and right links(50,51), a spring(60), and a back plate(70). The drum has a cylindrical shape and rotates with the wheel. Lining is formed on the outside of the left and right brake shoes to be rubbed with the inside of the drum, and the left and right brake shoes provide braking power. The left and right links presses the left and right brake shoes to the drum by the rotation of the rotational plate. One side of the left and right links connects to the rotational plate, and the other side connects to the left brake shoe and the right brake shoe, respectively. The spring connects the upper end of the left and right brake shoes. The left brake shoe, the right brake shoe, and the rotational plate are located on the back plate.

Description

Parking brake system for trailer vehicle

The present invention relates to a parking brake system, and more particularly, to a parking brake system that changes the link structure to improve braking performance.

A brake device is a device for decelerating or stopping a vehicle that is driving and for maintaining a stopped vehicle in a stationary state. The brake device converts the kinetic energy of the vehicle into thermal energy using friction force generated by the driver's operation force or auxiliary power. Braking.

 A general brake system is composed of a braking force generating device (Actual System), a braking system (Foundation System) and an auxiliary device. Braking force generator is a device that generates the force necessary for braking by using the driver's operating force or auxiliary power such as vacuum, hydraulic, and pneumatic. Master cylinder, booster, Air Master and Air Chamber belong to this.

The braking device is a device that actually decelerates or stops the vehicle by using the force generated by the braking force generating device, and includes a drum brake and a disc brake.

 As an auxiliary device, pipes, valves, and vacuum pumps for transferring the power of the braking force generating device to the braking device, and a vacuum pump for obtaining auxiliary power of the power generating device, air compressor, etc. There is this.

The brake system requires reliable operation, great effect, excellent reliability and durability, and easy inspection and adjustment.

 The types of brakes can be broadly divided into frictional and non-frictional. Friction brakes can be further divided into parking brakes and service brakes. Non-frictional brake refers to a deceleration brake, such as an engine brake or an exhaust brake. Commercial brakes are divided into hydraulic servo and full air.

Parking brakes are used when the vehicle is parked or parked. Also known as side brakes. Parking brakes are usually intended to be used as emergency brakes when the service brake is not working. Korean security standards usually require more than two brakes for a car, and one of them, a parking brake, requires the ability to completely stop an empty car on a dry pavement surface, which is 1/5 of a grade. Doing.

A trailer is a car that is towed behind a truck or tractor, also known as a connecting car. It is divided into full trailer and semi-trailer according to the connection method. In the case of a full trailer, the trailer alone carries the weight of the cargo. The tractor is therefore simply towing the trailer, which is achieved once a simple hook is attached to the rear of the body. However, this type is used only for transporting lightweight luggage because of its simple structure and lack of brakes.

In semitrailers, the trailer and part of the loading weight act directly on the tractor. Therefore, the tractor must have support and traction, so the rear wheels are usually doubled and the coupler is installed to facilitate relative movement, connection and disconnection with the trailer.

Recently, in Korea, like other countries, such trailers are connected with vehicles to enjoy leisure activities. Accordingly, the trailers themselves need parking brakes.

In the case of the parking brake system applied to the existing trailer, the link is fastened by welding, and there is a problem that the braking force is lost or degraded due to breakage of the link welding site when used for a long time. In addition, the operation stroke of the link is insufficient, and the tightening position is set so that the operating force cannot be transmitted efficiently.

The present invention is to solve the problems described above, an embodiment of the present invention relates to the increase in the operating force and the link operating stroke is located in the point-symmetrical fastening point of the left link and the right link.

According to one preferred embodiment of the present invention, a parking brake system used for parking of a vehicle, comprising: a cylindrical drum rotating with a wheel; A left brake shoe and a right brake shoe which are rubbed with the drum to transmit a braking force; Rotatable tumblers; The left side link and the right side link are connected to the rotating plate and the other side is connected to the left side brake shoe and the right side brake shoe so that the left brake shoe and the right brake shoe are in close contact with the drum as the rotating plate rotates; A spring connecting the upper side of the left brake shoe and the right brake shoe so that the left brake shoe and the right brake shoe are separated from the drum as the rotating plate returns to its original position; And a back plate on which the left brake shoe, the right brake shoe, and the rotating plate are positioned, the first fastening point at which the left link is fastened to the rotating plate and the second fastening point at which the right link is fastened to the rotating plate, A parking brake system is provided that is located on the first and third quadrants, respectively.

According to an embodiment of the present invention as described above, first, since the link is fastened by the hinge pin, the welding part is not damaged or deformed.

Second, since the fastening points of the left link and the right link are located in point symmetry, the length of the link is increased to improve the operating stroke.

Third, the operating force is increased by designing the overall shape of the left link and the right link to the shape including the arc shape.

Fourth, by designing a variety of fastening positions to increase the operating force of the link to push the left and right brake shoes, it is possible to park on a 40% slope.

Fifth, it is easy to disassemble and assemble using the hinge pin, so that the inspection and A / S of the brake system is improved.

Hereinafter, a preferred embodiment of a parking brake system of a trailer vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

In addition, the following examples are not intended to limit the scope of the present invention, but merely illustrative of the components set forth in the claims of the present invention, which are included in the technical spirit throughout the specification of the present invention and constitute the claims Embodiments including substitutable components as equivalents in the elements may be included in the scope of the present invention.

1 is a perspective view illustrating a state in which a parking brake system according to an embodiment of the present invention is applied to a vehicle, and FIG. 2 is a perspective view illustrating an axle assay to which a parking brake system according to an embodiment of the present invention is applied. 3 is a perspective view showing the internal structure of the parking brake system shown in FIG. 2, FIG. 4 is a front sectional view showing the parking brake system shown in FIG. 2, FIG. 5 is a sectional plan view showing the parking brake system shown in FIG. 6 is a side sectional view showing the parking brake system shown in FIG. 2, FIG. 7 is a side sectional view showing the axle assay shown in FIG. 2, and FIG. 8 is a front sectional view showing the parking brake system according to another embodiment of the present invention. 9 is a front cross-sectional view showing a situation before and after the operation of the link according to an embodiment of the present invention, Figure 10 is a front and rear image of the operation of the link according to another embodiment of the present invention. Shown is a front sectional view a.

Parking brake system of a trailer vehicle according to a preferred embodiment of the present invention, the parking brake system used for parking of the vehicle, the cylindrical drum 20 that rotates with the wheel (10); Lining is formed on the outside and the left brake shoe 30 and the right brake shoe 31 and friction with the inside of the drum 20 to transmit a braking force; Rotatable rotating plate 40; As the rotating plate 40 rotates, one side is connected to the rotating plate 40 so that the left brake shoe 30 and the right brake shoe 31 are in close contact with the drum 20, and the other side is the left brake shoe 30. ) And the left link 50 and the right link 51 connected to the right brake shoe 31, respectively; As the rotary plate 40 returns to its original position, the left brake shoe 30 and the right brake shoe 31 are separated from the drum 20 so that the left brake shoe 30 and the right brake shoe 31 are upper ends. Spring 60 for connecting the; And a back plate 70 on which the left brake shoe 30, the right brake shoe 31, and the rotating plate 40 are positioned, wherein the left link 50 is fastened to the rotating plate 40. The second fastening point 42, in which the first fastening point 41 and the right link 51 are fastened to the rotating plate 40, is located on the first and third quadrants of the rotating plate 40, respectively. .

As shown in FIG. 4, the parking brake system of the present invention includes a drum 20, a rotating plate 40, a brake shoe, a link, and a back plate 70.

As shown in FIG. 7, the drum is a portion that rotates like the wheel 10, has a cylindrical shape, and respective brake products are embedded therein, and a plurality of fastening holes are provided on the surface on which the wheel 10 is seated. Is formed. Most of the brake drum is made of special cast iron or light alloy, and in order to increase rigidity and improve heat dissipation, fins or ribs are placed in the circumferential direction or the direction perpendicular to the circumferential direction.

The brake shoe is installed inside the drum 20 and has a half moon shape. The brake shoe is made of cast iron or steel sheet and has a lining at the contact portion with the drum 20. The brake shoe is pressed by the brake drum according to the rotation of the rotary plate 40 to generate a braking force, and when the rotary plate 40 returns to its original position, it is automatically returned to the original position by the spring 60. The left brake shoe 30 and the right brake shoe 31 exist on both the left and right sides, respectively, and are placed in line-symmetry positions with each other.

Lining is a friction material formed on the outside of the brake shoe, the material used is a mixture of asbestos fibers and metal powder, but known as a carcinogen, it is possible to use a non-asbestos material, the frictional force in contact with the drum 20 Causes

The rotating plate 40 is a rotatable plate, and can be manufactured in a disc shape. The structure in which the rotation of the rotating plate 40 occurs can be variously designed. First of all, it can be driven by electric motor or solenoid valve. Or it can also be driven mechanically using hydraulic pressure or using a cable or the like.

The back plate is a place where brake shoes and the like are installed. The back plate is formed of a steel plate and puts ribs so that deformation is not made by a force applied during braking.

As the rotary plate 40 rotates, the link is connected such that the brake shoe is in close contact with the drum 20. The left link 50 and the right link 51 are formed, respectively, and are coupled to the rotating plate 40 at the first fastening point 41 and the second fastening point 42, respectively. As the rotating plate 40 rotates, the first fastening point 41 and the second fastening point 42 are also rotated, so that the left link 50 and the right link 51 are the left brake shoe 30 and the right brake. Each shoe 31 is pushed.

When the first fastening point 41 and the second fastening point 42 are respectively positioned on the first and third quadrants of the rotating plate 40, the first and second fastening points 41 and 42 are located on the second and fourth quadrants, respectively. The longer the stroke, the more the operating stroke can be obtained for the same angle of rotation.

In the parking brake system of the trailer vehicle according to the preferred embodiment of the present invention, the left link 50 and the right link 51 are hinge plate 52 by the rotary plate 40, the left brake shoe 30 and It is connected to the right brake shoe 31.

As shown in FIG. 3, the left link 50 and the right link 51 are connected to the rotating plate 40 and the brake shoe by a hinge pin 52. Conventionally, the hinge pin 52 is connected without welding. In this case, the welding part is damaged or deformed.

When the hinge pin 52 is used, there are no problems such as breakage or deformation of the welded part, and since the assembly and disassembly are easy, maintenance is also improved.

In the parking brake system of the trailer vehicle according to an embodiment of the present invention, the left link 50 and the right link 51 forms an arc from the first fastening point 41 and the second fastening point 42. From the left brake shoe 30 and the right brake shoe 31 to the arc shape is formed in a straight line.

As shown in Figure 8, it is possible to form the shape of the left link 50 and the right link 51 by combining the arc and the straight. That is, the portion in which the rotational movement occurs is arc-shaped, and the portion in which the linear movement occurs is linearly formed so that the rotational movement of the rotating plate 40 is naturally converted to the linear movement of the link.

In this case, the fastening point can be positioned on a line horizontal to the ground as a whole, rather than being formed in a straight line, so that the operating force can be transmitted more efficiently. That is, the same effect as that of the link pushing the left and right brake shoes in the straight direction can be obtained.

In the parking brake system of the trailer vehicle according to the preferred embodiment of the present invention, the first fastening point 41 and the second fastening point 42 are positioned to be point-symmetrical, and the right link as the turntable 40 rotates. An acute angle between the tangent at the point inside the drum 20 where the extension line of 51 meets and the extension line of the right link 51 is increased.

As shown in FIG. 9, when the first fastening point 41 and the second fastening point 42 are positioned to be point symmetrical, the right link 51 is rotated as the rotating plate 40 rotates counterclockwise. Since the quadrant moves from the quadrant, the second fastening position is lowered. The part shown by the solid line is the position of the initial link, and the part shown by the broken line is the position after the link is rotated.

That is, as the rotating plate 40 is rotated, the acute angle formed by the tangent at the inner point of the drum 20 where the extension line of the right link 51 meets and the extension line of the right link 51 increases, thereby increasing the operating force. .

In addition, in the case of an acute angle formed between the tangent at the inner point of the drum 20 where the extension line of the left link 50 meets and the extension line of the left link 50, the left link 50 moves in parallel because there is almost no change. To push the left brake shoe (30).

In the parking brake system of the trailer vehicle according to the preferred embodiment of the present invention, the left link 50 is the first fastening point 41 at a position that forms an angle of more than 90 degrees and less than 180 degrees from the right link 51. And the acute angle between the tangent at the inner point of the drum 20 where the extension line of the left link 50 meets as the rotating plate 40 rotates and the extension line of the left link 50 is increased. As the rotary plate 40 rotates, the acute angle between the tangent at the inner point of the drum 20 where the extension line of the right link 51 meets and the extension line of the right link 51 is increased.

As shown in FIG. 10, when the first fastening point 41 and the second fastening point 42 are located, the right link 51 is rotated in three quadrants as the rotating plate 40 rotates counterclockwise. The second fastening position is moved downward because it is moved to the fourth quadrant, and the left link 50 is moved to the second quadrant from the upper position of the y axis, which is the boundary between the first and second quadrants, so the first fastening position is downward. . The part shown by the solid line is the position of the initial link, and the part shown by the broken line is the position after the link is rotated.

That is, as the rotating plate 40 is rotated, the acute angle formed by the tangent at the inner point of the drum 20 where the extension line of the right link 51 meets and the extension line of the right link 51 increases, thereby increasing the operating force. .

In addition, since the acute angle between the tangent at the point inside the drum 20 where the extension line of the left link 50 meets and the extension line of the left link 50 also increases, the operating force becomes larger.

Conventionally, braking at 30 degrees was impossible, but the braking force performance was tested by applying the embodiment of the present invention, and braking is possible at 40 degrees or more.

1 is a perspective view illustrating a state in which a parking brake system according to an embodiment of the present invention is applied to a vehicle and used;

2 is a perspective view illustrating an axle assay to which a parking brake system is applied according to an embodiment of the present invention;

3 is a perspective view showing the internal structure of the parking brake system shown in FIG.

4 is a front sectional view showing the parking brake system shown in FIG. 2;

5 is a plan sectional view showing the parking brake system shown in FIG. 2;

6 is a side sectional view showing the parking brake system shown in FIG. 2;

7 is a side cross-sectional view illustrating the axle assay shown in FIG. 2;

8 is a front sectional view showing a parking brake system according to another embodiment of the present invention;

9 is a front sectional view showing a situation before and after the operation of the link according to an embodiment of the present invention;

10 is a front sectional view showing a situation before and after the operation of the link according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: wheel

20: drum

30: left brake shoe, 31: right brake shoe

40: rotating plate, 41: first fastening point, 42: second fastening point

50: left link, 51: right link, 52: hinge pin

60: spring

70: back plate

Claims (5)

In the parking brake system used for parking the vehicle, A cylindrical drum rotating with the wheel; Lining is formed on the outside and the left brake shoe and the right brake shoe friction with the drum and transmitting the braking force; Rotatable tumblers; A left link and a right link connected to the rotating plate and the other side connected to the left brake shoe and the right brake shoe so that the left brake shoe and the right brake shoe are in close contact with the drum as the rotating plate rotates; A spring connecting an upper end of the left brake shoe and the right brake shoe so that the left brake shoe and the right brake shoe are separated from the drum as the rotating plate returns to its original position; And The left brake shoe, the right brake shoe and the back plate is located; is made, including; And a first fastening point at which the left link is fastened to the rotating plate and a second fastening point at which the right link is fastened to the rotating plate, respectively located on the first and third quadrants of the rotating plate. system. The method of claim 1, The left link and the right link is connected to the rotating plate, the left brake shoe and the right brake shoe by a hinge pin. The method according to claim 1 or 2, And the left link and the right link form an arc from the first and second fastening points, and are formed in a straight line from the left brake shoe and the right brake shoe to the arc shape. The method according to claim 1 or 2, The first fastening point and the second fastening point are located to be point symmetric, And the acute angle between the tangent at the drum inner point where the extension line of the right link meets and the right link extension line increases as the rotary plate rotates. The method according to claim 1 or 2, The left link forms the first fastening point at a position that forms an angle of greater than 90 degrees and less than 180 degrees from the right link, As the rotating plate rotates, the acute angle between the tangent at the point inside the drum where the extension line of the left link meets and the extension line of the left link are increased. And the acute angle between the tangent at the drum inner point where the extension line of the right link meets and the right link extension line increases as the rotary plate rotates.

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