阅读说明：本技术 鼓式制动器 (Drum brake ) 是由 曺俊根 于 2019-07-05 设计创作，主要内容包括：本发明提供了一种鼓式制动器。根据本公开的实施例的鼓式制动器包括制动鼓,被配置成与车轮一起转动,以及第一制动蹄和第二制动蹄,与制动鼓的内圆周表面摩擦的衬片附接到该第一制动蹄和第二制动蹄,该鼓式制动器包括：第一枢轴固定部,被配置成以枢轴方式固定第一制动蹄的一端,使得当第一制动蹄相对于第一制动蹄的一端在一个方向枢转时第一制动蹄向外操作,并且由此第一制动蹄的衬片与制动鼓的内圆周表面摩擦；以及第二枢轴固定部,被配置成以枢轴方式固定第二制动蹄的一端,使得当第二制动蹄相对于第二制动蹄的一端在另一方向枢转时第二制动蹄向外操作,并且由此第二制动蹄的衬片与制动鼓的内圆周表面摩擦。(The invention provides a drum brake. A drum brake according to an embodiment of the present disclosure includes a brake drum configured to rotate together with a wheel, and first and second brake shoes to which linings that rub against an inner circumferential surface of the brake drum are attached, the drum brake including: a first pivot fixing portion configured to pivotally fix one end of the first brake shoe such that the first brake shoe is operated outward when the first brake shoe is pivoted in one direction with respect to the one end of the first brake shoe, and thereby a lining of the first brake shoe is rubbed with an inner circumferential surface of the brake drum; and a second pivot fixing portion configured to pivotally fix one end of the second brake shoe such that the second brake shoe is operated outward when the second brake shoe is pivoted in another direction with respect to the one end of the second brake shoe, and thereby the lining of the second brake shoe is rubbed with the inner circumferential surface of the brake drum.)

1. A drum brake, comprising: a brake drum that rotates together with a wheel, and first and second brake shoes to which linings that rub an inner circumferential surface of the brake drum are attached, the drum brake including:

a first pivot fixing portion that pivotally fixes one end of the first brake shoe such that the first brake shoe is operated outward when the first brake shoe is pivoted in one direction with respect to the one end of the first brake shoe, and thereby a lining of the first brake shoe is rubbed with an inner circumferential surface of the brake drum; and

a second pivot fixing portion that pivotally fixes one end of the second brake shoe such that the second brake shoe is operated outward when the second brake shoe is pivoted in another direction with respect to the one end of the second brake shoe, and thereby a lining of the second brake shoe is rubbed with an inner circumferential surface of the brake drum.

2. The drum brake according to claim 1, wherein said first and second pivotally-fixing portions each include a fixing pin fixed to an anchor block by an end of said first brake shoe and an end of said second brake shoe, respectively.

3. The drum brake of claim 2, wherein:

each of the first and second brake shoes including a rim having an outer circumferential surface to which the lining is attached, and a plate-like web coupled to an inner circumference of the rim; and is

The first and second pivot fixing portions are fixed to the anchor block by a web of the first brake shoe and a web of the second brake shoe, respectively.

4. The drum brake of claim 1, wherein:

one end of the first brake shoe and one end of the second brake shoe are disposed adjacent to each other; and is

The first pivot fixing part and the second pivot fixing part are symmetrically arranged.

5. The drum brake of claim 4, in which

The other end of the first brake shoe and the other end of the second brake shoe are disposed in contact with wheel cylinders that receive brake hydraulic pressure to outwardly operate the first brake shoe and the second brake shoe.

Technical Field

The present disclosure relates to a drum brake, and more particularly, to a drum brake configured to provide improved braking performance.

Background

In general, a drum brake configured to generate a braking force by friction with a brake drum rotating together with a wheel generates a braking force by friction with a brake shoe against which a lining is attached using hydraulic pressure or a parking cable coupled with a parking brake lever.

A conventional drum brake configured to perform these functions includes a brake drum disposed in a cylindrical shape and configured to rotate with a wheel; a pair of brake shoes provided on the back plate to face an inner circumferential surface of the brake drum and having linings attached to an outer circumference of the brake drum; and a wheel cylinder having a piston embedded in the wheel cylinder to receive the brake hydraulic pressure and operate the brake shoes radially outward.

In the pair of brake shoes, linings attached to the outer circumferences of the brake shoes are in contact with the inner circumferential surface of the brake drum to generate a frictional braking force, and the first brake shoe may be disposed on a forward rotation direction side of the brake drum with respect to the wheel cylinder, and the second brake shoe may be disposed on an opposite side.

In a conventional drum brake, each of a first brake shoe and a second brake shoe is disposed such that one end is supported by a bearing (anchor part) and the other end is in contact with a wheel cylinder. Further, during operation of each brake shoe, the bearing and the brake shoe are in surface contact with each other to move along the inclined bearing. Therefore, since one end of each of the brake shoes is not fixedly supported by the bearing portion, there is a problem that braking efficiency is low due to sliding or the like.

[ patent document ]

Korean patent application No. 10-0435197 entitled "drum brake" was filed on 9/6/2004.

Disclosure of Invention

The present invention is directed to a drum brake including first and second brake shoes to which linings that rub against an inner circumferential surface of a brake drum are attached, wherein one end of each of the first and second brake shoes is pivotally fixed during pivoting to operate outward, and thereby friction between the inner circumferential surface of the brake drum and the linings of the brake shoes is stably and efficiently performed.

According to an aspect of the present disclosure, there is provided a drum brake including a brake drum configured to rotate together with a wheel, and first and second brake shoes to which linings that rub against an inner circumferential surface of the brake drum are attached, the drum brake including: a first pivot fixing portion configured to pivotally fix one end of the first brake shoe such that the first brake shoe is operated outward when the first brake shoe is pivoted in one direction with respect to the one end of the first brake shoe, and thereby a lining of the first brake shoe is rubbed with an inner circumferential surface of the brake drum; and a second pivot fixing portion configured to pivotally fix one end of the second brake shoe such that the second brake shoe is operated outward when the second brake shoe is pivoted in another direction with respect to the one end of the second brake shoe, and thereby the lining of the second brake shoe is rubbed with the inner circumferential surface of the brake drum.

In this case, each of the first pivot-fixing portion and the second pivot-fixing portion may include a fixing pin fixed to the anchor block by one end of the first brake shoe and one end of the second brake shoe, respectively.

Further, each of the first and second brake shoes may include a rim having an outer circumferential surface to which the lining is attached, and a plate-shaped web coupled to an inner circumference of the rim; and the first and second pivot mounting portions may be secured to the anchor block by a web of the first brake shoe and a web of the second brake shoe, respectively.

In addition, one end of the first brake shoe and one end of the second brake shoe may be disposed adjacent to each other; and the first pivot fixing part and the second pivot fixing part may be symmetrically disposed.

In addition, the other end of the first brake shoe and the other end of the second brake shoe may be disposed in contact with wheel cylinders configured to receive brake hydraulic pressure to outwardly operate the first brake shoe and the second brake shoe.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:

FIG. 1 is a perspective view of a drum brake according to an embodiment of the present disclosure;

fig. 2 is a perspective view of one end portion of a first shoe and one end portion of a second shoe of the drum brake according to the embodiment of the invention, as viewed from the inside of the drum brake;

fig. 3 is a perspective view of one end portion of a first shoe and one end portion of a second shoe of the drum brake according to the embodiment of the invention, as viewed from the outside of the drum brake; and

fig. 4 is a diagram showing a drum brake in which one end portion of a first brake shoe and one end portion of a second brake shoe are fixed in a manner not according to the present disclosure.

Detailed Description

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, which can easily enable those of ordinary skill in the art to carry out the present disclosure. The present disclosure may be embodied in various forms and is not limited to the following embodiments. Components that are not relevant to the description are not included in the figures to clearly describe the present disclosure, and the same reference numerals are used for the same or similar components in the description.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "provides," "has," "having" and/or "having" specify the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

FIG. 1 shows a perspective view of a drum brake according to an embodiment of the present disclosure; fig. 2 shows a perspective view of one end portion of a first and a second brake shoe of a drum brake according to an embodiment of the invention, viewed from the interior of the drum brake; and fig. 3 shows a perspective view of one end portions of first and second brake shoes of a drum brake according to an embodiment of the present invention, as viewed from the outside of the drum brake.

Referring to fig. 1 to 3, a drum brake 100 according to an embodiment of the present disclosure includes a brake drum 110, a back plate 120, a first brake shoe 130a, a second brake shoe 130b, a first pivot fixing portion 140a, a second pivot fixing portion 140b, a wheel cylinder 150, a return spring 160, and an adjuster 170.

The brake drum 110 is a cylindrical member configured to rotate with a wheel of a vehicle. In the brake drum 110, the inner circumferential surface of the brake drum 110 rubs against the linings 131a and 131b of the first and second brake shoes 130a and 130b, thereby generating a braking force.

The back plate 120 is a member to which the configuration of the drum brake 100 other than the brake drum 110 is fixed. The backing plate 120 is relatively fixed with respect to the brake drum 110. The back plate 120 includes an anchor block 121, and one end of the first brake shoe 130a and one end of the second brake shoe 130b are fixed to a lower end of the anchor block 121. More specifically, the anchor block 121 may be provided in a shape protruding forward from a central portion of the lower end of the front surface of the back plate 120.

First and second brake shoes 130a and 130b are provided on the backing plate 120 to face the inner circumferential surface of the brake drum 110, and linings 131a and 131b are attached to the outer circumferential surface. Each of the first and second brake shoes 130a and 130b is formed in an arc shape, and a cross section cut in a radial direction has a "T" shape. First and second brake shoes 130a and 130b include rims 132a and 132b each formed in an arc shape such that linings 131a and 131b are attached to outer circumferential surfaces thereof, and plate- shaped webs 133a and 133b are configured to extend from inner circumferential surfaces of rims 132a and 132b, respectively. The rims 132a and 132b may be coupled to the webs 133a and 133b, respectively, by welding or the like and formed integrally with the webs 133a and 133 b.

In the embodiment of the present disclosure, the first brake shoe 130a may be a leading shoe disposed on one side of the forward rotational direction of the brake drum 110 with respect to the wheel cylinder 150, and the second brake shoe 130b may be a trailing shoe disposed opposite to the first brake shoe 130 a. As described above, a drum brake including a pair of brake shoes is called a neck/shoe (L/T) type drum brake.

In this case, the functions of the leading shoe and the trailing shoe are variable, and therefore, when braking is performed while the vehicle is traveling, the first brake shoe 130a may serve as the leading shoe and the second brake shoe 130b may serve as the trailing shoe, and when braking is performed while the vehicle is moving backward, the second brake shoe 130b may serve as the leading shoe and the first brake shoe 130a may serve as the trailing shoe.

First pivot fixing portion 140a pivotally fixes one end of first brake shoe 130a such that first brake shoe 130a is operated outward when first brake shoe 130a is pivoted in one direction with respect to one end of first brake shoe 130a, and thus lining 131a of first brake shoe 130a rubs against the inner circumferential surface of brake drum 110.

Further, the second pivot fixing portion 140b pivotally fixes one end of the second brake shoe 130b such that the second brake shoe 130b is operated outward when the second brake shoe 130b is pivoted in the other direction with respect to the one end of the second brake shoe 130b, and thereby the lining 131b of the second brake shoe 130b is rubbed with the inner circumferential surface of the brake drum 110.

In an embodiment of the present disclosure, each of the first and second pivot fixing portions 140a and 140b may include a fixing pin fixed to the anchor block 121 by one end of the first brake shoe 130a and one end of the second brake shoe 130b, respectively. In this case, the first and second pivot fixing portions 140a and 140b may include head portions engaged with the first and second brake shoes 130a and 130b, respectively, on ends thereof.

More specifically, first and second pivot fixing portions 140a and 140b may be fixed to anchor block 121 by webs 133a and 133b of first and second brake shoes 130a and 130b, and for this purpose, through-holes may be formed in each of webs 133a and 133b of first and second brake shoes 130a and 130 b.

Further, one end of the first brake shoe 130a and one end of the second brake shoe 130b may be disposed adjacent to each other, and the first pivot fixing part 140a and the second pivot fixing part 140b may be symmetrically disposed.

The wheel cylinder 150 receives the braking hydraulic pressure to operate the first and second brake shoes 130a and 130b radially outward. Pistons configured to operate the first and second brake shoes 130a and 130b outward are provided in the wheel cylinders 150. In the embodiment of the present disclosure, the other end of first brake shoe 130a and the other end of second brake 130b are disposed in contact with wheel cylinder 150, and when braking is required while the vehicle is running, wheel cylinder 150 receives hydraulic pressure and operates first brake shoe 130a and second brake shoe 130b outward, so that linings 131a of first brake shoe 130a and linings 131b of second brake shoe 130b rub against the inner circumferential surface of brake drum 110 to generate braking force.

When the braking action is released, the return spring 160 provides a spring force that restores the first and second brake shoes 130a and 130b to the inside. That is, when the outward operation of the first and second brake shoes 130a and 130b is stopped by the wheel cylinders 150, the return spring 160 restores the first and second brake shoes 130a and 130b to the original positions.

Adjuster 170 is used to compensate for the spacing between linings 131a and 131b of first and second brake shoes 130a and 130b from brake drum 110. Specifically, when the thicknesses of linings 131a and 131b of first and second brake shoes 130a and 130b are reduced due to repeated friction between linings 131a and 131b, adjuster 170 moves first and second brake shoes 130a and 130b outward by the reduced thicknesses.

In fig. 4, a comparative example of a drum brake in which one end of the first brake shoe 130a and one end of the second brake shoe 130b are fixed in a manner not according to the present disclosure is shown. As shown in fig. 4, one end of the first brake shoe 130a and one end of the second brake shoe 130b are supported by the fixing portion 10. The fixing portion 10 includes a fixing plate 11 provided on the anchor block 121 between one end of the first brake shoe 130a and one end of the second brake shoe 130 b; a pair of fixing pins 12a and 12b configured to fix the fixing plate 11 to the anchor block 121, and a lower return spring 13 configured to connect one end of the first brake shoe 130a and one end of the second brake shoe 130b to provide elasticity.

Referring to fig. 4, one end of first brake shoe 130a and one end of second brake shoe 130b are in surface contact with fixing plate 11 of anchor block 121. In other words, a structure in which one end of first brake shoe 130a and one end of second brake shoe 130b are fixedly supported by anchor block 121 in a pivotal manner is not included. Therefore, the possibility of occurrence of slip when the drum brake is operated may be high, and therefore, the braking efficiency may be reduced.

In contrast to the above, as described above, in the drum brake 100 according to the embodiment of the present disclosure, since the one end of the first brake shoe 130a and the one end of the second brake shoe 130b are pivotally fixed using the first pivot fixing portion 140a and the second pivot fixing portion 140b, respectively, sliding may not occur during operation, and improved braking performance may be provided by the pivot structure. Further, according to the embodiment of the present disclosure, since the configuration related to fixing the one end of the first brake shoe 130a and the one end of the second brake shoe 130b is simplified, the number of required components may be reduced, as compared to the structure shown in fig. 4.

A drum brake according to an embodiment of the present disclosure can prevent a brake shoe from slipping by a pivot structure of the brake shoe to provide improved braking performance.

Further, the drum brake according to the embodiment of the present disclosure can simplify the structure of the drum brake by the pivot structure of the brake shoe, and therefore, the number of components can be reduced.

Although one embodiment of the present disclosure is described above, the spirit of the present disclosure is not limited to the embodiments shown in the specification, and although one skilled in the art may provide other embodiments by adding, changing or removing components within the scope of the same spirit of the present disclosure, the embodiments are also included within the scope of the spirit of the present disclosure.