Cladding composite brake drum

Abstract

A cladding composite brake drum comprises a drum portion and a flange portion which are fixed together, a plurality of mounting holes are formed in the flange portion, a transition area between a shell of the drum portion and the flange portion is a bottom, the shell of the drum portion and the flange portion are integrally formed through spinning of a steel pipe, an inner layer of the drum portion is a friction layer, and the friction layer and the shell of the drum portion are fixed in a cladding mode. A plurality of heat dissipation holes are formed in the bottom, the number of the heat dissipation holes is consistent with that of the mounting holes, and the heat dissipation holes and the mounting holes are staggered. The heat dissipation holes are axial arc-shaped holes, and the arc-shaped holes extend in the circumferential direction of the bottom. Compared with the prior art, the cladding composite brake drum has the technical effects that the drum part and the flange part of the cladding composite brake drum are integrally formed by spinning, and the inner layer is the friction layer.

Description

Technical Field

[0001] The utility model belongs to the technical field of brake drums, and specifically relates to a cladding composite brake drum. Background Art

[0002] The brake drum is an important component in the drum brake system of vehicles such as automobiles, and belongs to security parts and wearing parts.

[0003] As China has become a major automobile producer and user country, the annual demand for brake drums is very large. The material of brake drums is generally gray cast iron. Previously, it was mostly HT200, and now it has basically tended to be low-alloyed HT250. There are also those using HT300, ductile iron or vermicular graphite cast iron.

[0004] For the brake drum produced by the iron mold coated sand process, the clay sand mold casting has the advantages of low production cost, high production efficiency and strong adaptability. Therefore, the casting of brake drums is still relatively common with clay sand machine molding. Usually, the casting process of brake drums uses the outer edge pouring method, which is easy to cause turbulent flow and large temperature differences in different parts, resulting in problems such as casting porosity, shrinkage porosity and uneven material properties, reducing its service life.

[0005] For example, the Chinese patent document CN103343791A discloses a brake drum. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is: how to design a cladding composite brake drum to increase its service life.

[0007] The technical solution of the utility model is specifically as follows:

[0008] A cladding composite brake drum includes a drum part and a flange part fixed together. There are a plurality of mounting holes on the flange part. The transition area between the outer shell of the drum part and the flange part is the bottom. The outer shell of the drum part and the flange part are integrally formed by spinning a steel pipe. The inner layer of the drum part is a friction layer, and the friction layer is fixedly cladded with the outer shell of the drum part.

[0009] There are a plurality of heat dissipation holes on the bottom. The number of heat dissipation holes is the same as that of the mounting holes and they are staggered.

[0010] The heat dissipation holes are axial arc-shaped holes, and the arc-shaped holes extend in the circumferential direction of the bottom.

[0011] Compared with the prior art, the technical effect of the utility model is that the drum part and the flange part of the cladding composite brake drum of the utility model are integrally formed by spinning, and the inner layer is a friction layer. Brief Description of the Drawings

[0012] Figure 1 It is the top view schematic diagram and the sectional schematic diagram (one) of the utility model.

[0013] Figure 2 This is the top view schematic diagram and the sectional view schematic diagram (II) of the utility model.

[0014] Specific test method

[0015] The following will introduce the utility model in detail in conjunction with the attached drawings and its specific implementation manners.

[0016] As Figure 1 , a cladding composite brake drum includes a drum part and a flange part 10 fixed together. A plurality of mounting holes 11 are provided on the flange part 10. The transition area between the outer shell 12 of the drum part and the flange part 10 is the bottom 13. The outer shell 12 of the drum part and the flange part 10 are integrally cold rotary swaged from a steel pipe.

[0017] Cold rotary swaging is an existing processing method, which is rotary swaging carried out at normal temperature.

[0018] Rotary swaging is to fix a flat or hollow blank (steel pipe) on the die of a rotary swaging machine. While the blank rotates with the main shaft of the machine tool, a rotary wheel or a driving bar is used to apply pressure to the blank to cause local plastic deformation. Rotary swaging is a special forming method. Various processes such as drawing, flanging, necking, bulging, and curling of various shaped rotating bodies can be completed by the rotary swaging method.

[0019] The inner layer of the drum part is a friction layer 20, and the friction layer 20 is cladding-fixed with the outer shell 12 of the drum part.

[0020] Cladding is an existing processing method, also known as laser cladding (Laser Cladding), laser deposition or laser coating, which is a surface modification technology. It forms a metallurgical-bonded filler cladding layer (i.e., the friction layer) on the surface of the base material by adding a cladding material (the raw material of the friction layer - metal powder) on the surface of the base material (the inner surface of the outer shell 12 of the drum part) and using a high-energy density laser beam to melt and solidify it together with a thin layer of the base material surface.

[0021] As Figure 2 , for the convenience of heat dissipation, a plurality of heat dissipation holes 15 are provided on the bottom 13. The number of the heat dissipation holes 15 is the same as that of the mounting holes 11 and the two are staggered.

[0022] After the heat dissipation holes are provided, although it is convenient for heat dissipation, it will also increase the probability of its own deformation (if deformation occurs, the brake drum will be damaged). Therefore, the heat dissipation holes 15 and the mounting holes 11 are staggered, so as to minimize the probability of its own deformation.

[0023] For the convenience of processing, the heat dissipation holes 15 are axial arc-shaped holes, and the arc-shaped holes extend in the circumferential direction of the bottom 13.

[0024] This arc-shaped hole reduces the hollowed-out part of the brake drum in the axial direction, shortening the torsional deformation area. While increasing the heat dissipation area, it can also reduce the probability of self-deformation.

[0025] During processing, it is necessary to machine the mounting hole 11. The heat dissipation hole 15 is axially aligned with the mounting hole 11, eliminating the need to clamp the workpiece again or adjust the drill bit direction. At this time, the heat dissipation hole 15 can be machined, which brings convenience to the processing.

[0026] Its working principle is as follows:

[0027] During processing, first, seamless steel pipes are spun and punched, and then a wear-resistant material is coated on the inner cavity of the brake.

[0028] During use, like the existing brake drum, it can dissipate heat through the heat dissipation holes to prevent the brake drum from getting too hot itself.

[0029] The features of this application are as follows:

[0030] S1. This patent introduces a new type of brake drum, which adopts the process method of spinning seamless steel pipes to form a fully enclosed steel shell structure, and then coating a wear-resistant material on the inner cavity of the brake.

[0031] S2. The advantages are that by combining the spun-formed brake drum with the processes of cladding coating or sintering wear-resistant materials, the finished brake drum has a high yield, few defects, low cost, and high strength.

[0032] For other content, refer to the prior art.

[0033] The above are only the preferred embodiments of the present utility model. It should be noted that for those skilled in the art, without departing from the overall concept of the present utility model, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present utility model.

Claims

1. A clad composite brake drum, comprising a drum part and a flange part (10) fixed together, wherein a plurality of mounting holes (11) are provided on the flange part (10), and a transition area between the outer shell (12) of the drum part and the flange part (10) is a bottom part (13), and is characterized in that: The outer shell (12) of the drum part and the flange part (10) are integrally formed by spinning a steel pipe. The inner layer of the drum part is a friction layer (20), and the friction layer (20) is fixedly clad to the outer shell (12) of the drum part.

2. The clad composite brake drum according to claim 1, wherein: A plurality of heat dissipation holes (15) are provided on the bottom (13). The number of the heat dissipation holes (15) is the same as that of the mounting holes (11), and the two are staggered.

3. The cladding composite brake drum according to claim 2, characterized in that: The heat dissipation holes (15) are axial arc-shaped holes, and the arc-shaped holes extend in the circumferential direction of the bottom (13).

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