WO2011111901A1 - Brake shoe and method for manufacturing same - Google Patents

Abstract

The present invention relates to a brake shoe and method for manufacturing same. According to one aspect of the present invention, an integrated brake shoe comprises: an arc-shaped web including a first web portion and a second web portion connected to each other with an overlap; a cylinder-shaped rim including a first rim portion and a second rim portion formed by bending the edges of the first and second web portions, respectively, and disposed in parallel to one another; and a lining attached to the rim.

Description

Brake shoe and its manufacturing method

TECHNICAL FIELD The present invention relates to a brake shoe and a method for manufacturing the same, and more particularly, to a brake shoe used in a braking device of an automobile and a method for manufacturing the same.

In general, a drum brake mounted on a vehicle obtains braking force by rubbing a drum rotating together with a wheel from inside to obtain a braking force. The drum brake is disposed on the back plate so as to face the inner circumference of the drum, and the lining is attached to the outer circumference. It has a pair of brake shoes and a wheel cylinder with a built-in piston for braking hydraulic pressure to radially outwardly operate the brake shoes.

The pair of brake shoes each includes a semicircular rim to which a lining is attached through an adhesive, and a web welded in the longitudinal direction to the inner circumference of the rim so that one end of the brake shoe is in contact with the anchor block side of the other.

Therefore, when the driver presses the brake pedal, the braking hydraulic pressure generated in the master cylinder assembly is transmitted to the wheel cylinder. Subsequently, the piston of the wheel cylinder pushes the pair of brake shoes outwards by the braking hydraulic pressure, so that the lining rubs against the drum rotating with the wheel to generate the braking force.

In addition to the drum brakes, the brake shoes are also used for hand brakes called so-called side brakes.

Looking at the manufacturing process of the brake shoe is typically manufactured separately from the web and the rim through a blanking process, etc. and then mounted on a jig so as to be firmly coupled by welding in a state in which both are kept in contact with each other. Thereafter, a brake lining is attached to the surface of the rim. In order to ensure that the brake lining is more firmly attached, a lining is attached to the surface of the rim to complete the lining.

In this case, the web and the rim should be processed to have precise dimensions so that interference with adjacent parts does not occur, and thus expensive blanking facilities and molds should be used. In addition, since the fracture surface should have an appropriate appearance quality in the blanking process, a separate finishing work should also be performed after the blanking is completed.

In addition, problems such as poor shape or poor weld strength may occur in the welding process, and there is a concern that damage to the appearance of the product may occur during the knurling process after the welding is completed. In conclusion, the conventional brake shoes have a problem in that the manufacturing process is complicated and a high occurrence rate of defects increases the product cost.

The present invention has been made to overcome the disadvantages of the prior art as described above, the technical problem is to provide a brake shoe that can be manufactured more specifically.

Another object of the present invention is to provide a method for manufacturing a brake shoe which can be manufactured more easily than in the related art.

According to an aspect of the present invention for achieving the above technical problem, the first web portion and the second web portion connected to each other is formed to overlap, the web having an arc shape; And a rim formed by bending the edge portions of the first web portion and the second web portion, respectively, the first rim portion and the second rim portion arranged side by side to have a circumferential shape. And a lining attached to the rim.

That is, in the above aspect of the present invention, the web and the rim are separately manufactured and then attached to each other by welding or the like, but one plate is bent to form a web, and the edge of the web is bent again to form the rim. By forming it, the rest of the brake shoe except the lining is to form a unit.

As a result, a separate welding process is not required, so that the manufacturing process may be very simple, and the web and the rim may be integrated, thereby improving the reliability of the product. In addition, since the web has a form in which two sheets of paper are overlapped, it becomes possible to use a thinner plate, thereby significantly reducing the die processing cost, thereby lowering the overall manufacturing cost. In addition, since the product is produced using a single plate, the use cost of raw materials may be increased, thereby reducing the material cost.

Here, the surface of the rim may be knurled.

In addition, the web and the rim may be disposed at a right angle.

According to another aspect of the invention, the step of preparing a plate having a symmetrical form with respect to the center line; Forming first and second rims by bending both ends based on the center line of the plate; Bending along the center line of the plate to form the first and second rims parallel to each other, and forming a portion between the first and second rims and the center line to overlap each other; Shaping the first and second rims to have a circumferential shape; And attaching a lining over the first rim portion and the second rim portion.

Here, the preparing of the plate may be performed through blanking, and in this process, a knurling process may be performed on one surface of the first and second rims in the blanking process. For example, if the surface of the blanking mold is knurled, the blanking may be performed while knurling may be performed at the same time.

In addition, the first and second rims may be simultaneously knurled on one surface of the first and second rims during a process of being molded to have a circumferential shape.

According to the present invention having the configuration described above, since the web and the rim are integrally formed, the rigidity of the product is improved and the dimensional accuracy is also increased, so that the quality of the product can be remarkably improved.

In addition, the manufacturing process can be simplified as well as compared to the conventional welding method can reduce the incidence of defects, thereby reducing the unit cost of the product.

1 is a perspective view showing an embodiment of an integrated brake shoe according to the present invention.

2 is a cross-sectional view taken along the line A-A 'in FIG.

3 to 7 are state diagrams schematically showing a process of manufacturing the embodiment.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the integrated brake shoe according to the present invention.

1 is a perspective view illustrating an embodiment 100 of an integrated brake shoe according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1. 1 and 2, the embodiment 100 is arranged to be orthogonal to the web 110 having an arc shape and the web 110, like a general brake shoe, and has a rim 120 having a circumferential shape. Include. In addition, a brake lining 130 that generates a braking force while contacting the inner surface of the drum (not shown) is attached to the surface of the rim 120 by an adhesive or the like.

On the other hand, the web 110 is formed in a state where the two plate materials overlap each other as shown. Specifically, one plate is formed in a state of being bent with respect to the center line and in contact with each other. For convenience of description, each of the plates is referred to as a first web portion 110a and a second web portion 110b. Let's do it.

Since the first and second web portions 110a and 110b are actually one plate, they are formed to be folded based on a center line, so that the web 110 has a thickness corresponding to twice the thickness of the one plate. Will have In general, the thinner the plate thickness, the better the processability and the relatively inexpensive mold can be used during the blanking process. Therefore, the web 110 can reduce the installation cost of the production equipment, such as the mold cost, compared to the conventional web that the whole web is integral, as well as have a more accurate appearance. In addition, it is possible to accurately manage the fracture surface during the blanking process.

The rim 120 is disposed above the web 110. Here, the rim 120 is not made of a separate material, but is actually formed by bending the end portions of the first and second web portions 110a and 110b at right angles. That is, the rim 120 is parallel to the first rim portion 120a formed integrally with the first web portion 110a and the second rim portion 120b formed integrally with the second web portion 110b. Arranged and formed.

In addition, sliding ribs 122 are formed at both end portions of the rim 120 in contact with the back plate positioned inside the drum on which the brake shoes are mounted to smoothly slide the brake shoes. The sliding rib 122 is also formed by bending a portion of the first rim portion 120a and the second rim portion 120b.

Due to this configuration, the entire brake shoe except for the lining is made integral. This eliminates the joining process between the web and the rim and improves the bond strength between the web and the rim.

On the other hand, the lining 130 and the rim 120 is attached by an adhesive or the like, in order to improve the adhesive strength therebetween, the surface of the lining 130 is formed with a knurled portion.

3 to 7, the manufacturing process of the above embodiment will be described.

In the production of the above embodiment, first, the raw material supplied in the form of a sheet is blanked to process a sheet of a form as shown in FIG. Thereafter, processing is performed sequentially through a sheet metal or roll forming process. That is, as shown in FIG. 4, a portion corresponding to the sliding rib 122 positioned at the ends of the first and second rim portions 120a and 120b is preferentially bent.

However, instead of molding the sliding ribs 122 at once, the molding is performed in stages as shown in FIGS. 4 and 5. When the molding of the sliding rib 122 is completed as shown in FIG. 6, the first and second rims 120a and 120b are bent and then bent along the center line C of the plate. The first and second rim portions 120a and 120b are also molded in stages like the sliding rim portion 122, but are not shown for convenience of description.

Thereafter, the first and second web portions 110a and 110b are bent to contact each other to form a brake shoe semifinished product, as shown in FIG. 7, and then the semifinished product is formed to have a curvature as shown in FIG. 1. Bending process. In this case, a knurling process may be performed on the surface of the rim 120 in the bending process. That is, in order to bend the semifinished product, bending and rolling may be simultaneously performed by using a knurled part formed on the surface of the roller by using a roller or the like to have a predetermined curvature while fixing the semifinished product.

Through this, a separate knurling process can be omitted, and when bending is completed, the lining is attached to the surface of the rim to complete the final product.

According to the manufacturing method as described above, as described above, even when using a plate material having a thinner thickness than in the prior art, it is possible to secure the same or higher rigidity. In addition, compared to the case of separately blanking the rim and the web separately, the raw material usage can be significantly reduced.

In fact, when manufacturing them by a conventional method, 0.8127kg should be put into a plate having a thickness of 6T as a material for the web and a plate having a thickness of 2T as a material for the rim, of which 0.4121kg is discarded as scrap. . On the other hand, in the manufacturing method, 0.5103 kg of a material having a thickness of 3T is added and 0.1027 kg is discarded as scrap. Therefore, it can be seen that the total amount of material input is also reduced while the amount of scrap is significantly reduced. In addition, as the thickness of the plate is thicker, the raw material costs also increase, so it can be seen that the manufacturing cost is significantly reduced when using the manufacturing method as described above.

In addition, the manufacturing method can be performed continuously from the blanking of the plate to the bending, but according to the conventional method to form the web and the rim after welding and knurled separately, so that the surface of the working speed In addition, it is possible to achieve a significant improvement compared to the prior art.

Claims (7)

A first web portion and a second web portion connected to each other, the web having an arc shape; And First and second rim portions formed by bending the edge portions of the first web portion and the second web portion, respectively, which are arranged side by side to have a circumferential shape; And Lining attached to the rim; integral brake shoe comprising a. The method of claim 1, Integral brake shoes, characterized in that the surface of the rim is knurled. The method of claim 1, And the web and the rim are disposed at a right angle. Preparing a plate having a symmetrical shape based on the center line; Forming first and second rims by bending both ends based on the center line of the plate; Bending along the center line of the plate to form the first and second rims parallel to each other, and forming a portion between the first and second rims and the center line to overlap each other; Shaping the first and second rims to have a circumferential shape; And Attaching a lining over the first rim and the second rim. The method of claim 4, wherein Preparing the plate material is a manufacturing method of the brake shoe, characterized in that made through blanking. The method of claim 5, In the blanking process, a knurling process is performed on one surface of the first and second rims. The method of claim 4, wherein The first and second rim portion manufacturing method of the brake shoe, characterized in that the knurling process is simultaneously performed on one surface of the first and second rim portion during the molding process to have a circumferential form.

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