Tri-metal brake drum

Abstract

The utility model belongs to the technical field of brake drum machining, and particularly relates to a tri-metal brake drum which comprises a flange portion and a rim portion, the rim portion is integrally connected to the right end of the flange portion, the flange portion is a steel flange portion, the rim portion comprises an inner vermicular graphite cast iron layer and an outer nodular cast iron layer, and the inner vermicular graphite cast iron layer and the outer nodular cast iron layer are integrally connected. The left end of the vermicular graphite cast iron layer extends to the inner side of the right end of the flange part and is combined with the inner surface of the right end of the flange part into a whole. The LED lamp tube is simple in structure, high in tensile strength and good in heat dissipation performance, the manufacturing cost is reduced, and meanwhile the manufacturing efficiency of products can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of brake drum processing, and specifically relates to a three-metal brake drum. Background Art

[0002] The brake drum is an important component for automotive braking. When the vehicle in motion needs to brake, the driver steps on the brake pedal, and the braking mechanism pushes the brake shoe iron blocks, causing the friction linings fixed (fixedly connected) to the shoe irons to generate braking friction with the brake drum, thus braking the vehicle wheels and achieving vehicle braking. However, during vehicle operation, especially in summer with high temperatures or when frequent braking is required due to poor road conditions, the temperature of the brake drum and tires in the braking device becomes very high, even overheating, which easily causes the braking device to fail and lead to accidents.

[0003] Chinese Patent Document CN204921784U discloses an automotive brake drum, which includes a cylindrical body and an annular boss provided on the outer surface of the body. Among them, the annular boss includes a three-metal layer, which from inside to outside is successively a body layer, a strengthening layer, and a heat dissipation layer. A number of heat dissipation holes are provided on the strengthening layer along the axis direction of the brake drum, improving the heat dissipation performance of the brake drum. However, this brake drum requires consumables such as low-carbon alloy and metallic copper, with low manufacturing efficiency and high manufacturing cost. In addition, the structure is relatively complex, and the tensile strength of the brake drum also needs to be further improved.

[0004] Therefore, there is a need to improve the existing brake drum. Summary of the Utility Model

[0005] The purpose of the present utility model is to solve the above technical problems, and its technical solution is as follows:

[0006] A three-metal brake drum includes a flange portion and a rim portion. The rim portion is integrally connected to the right end of the flange portion. The flange portion is a steel flange portion. The rim portion includes an inner vermicular graphite cast iron layer and an outer ductile iron layer. The left end of the vermicular graphite cast iron layer extends to the inner side of the right end of the flange portion and is integrally combined with the inner surface of the right end of the flange portion.

[0007] Preferably, a groove is provided on the right end surface of the flange portion to improve the bonding strength between the right end surface of the flange portion and the ductile iron layer.

[0008] Preferably, an annular heat dissipation groove is provided on the outer circumferential surface of the right end of the flange portion, and pits are evenly distributed on the outer circumferential surface of the ductile iron layer. More preferably, the diameter of the pits is 2 - 5 mm, and the depth is 1 - 3 mm. It is used to increase the contact area between the outer surface of the device and the air, that is, to increase the heat dissipation area of the device, thereby effectively improving its heat dissipation effect.

[0009] Preferably, a plurality of grooves are provided on the inner surface of the right end of the flange portion where it combines with the vermicular graphite cast iron layer, for improving the bonding strength between the inner surface of the right end of the flange portion and the vermicular graphite cast iron layer.

[0010] Preferably, the vermicular graphite cast iron layer and the ductile iron layer are integrally combined with the flange portion by centrifugal casting, further ensuring the overall structural strength of the brake drum.

[0011] The flange portion at the left end of the present utility model is made by spinning from a steel material, and the vermicular graphite cast iron layer and the ductile iron layer at the right end are both centrifugally cast. During casting, first place the flange portion into a metal mold, and first cast the outer ductile iron layer from the inner side of the metal mold, and then cast the inner vermicular graphite cast iron layer, which helps to reduce the manufacturing cost of the brake drum and improve the manufacturing efficiency and tensile strength of the brake drum.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] The present utility model has a simple structure, high tensile strength, and good heat dissipation performance. While reducing the manufacturing cost, it also helps to improve the manufacturing efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model in the embodiment.

[0015] Figure 2 is Figure 1 a schematic cross-sectional structure diagram along the A-A direction in

[0016] Figure 3 is Figure 2 an enlarged schematic diagram of the structure of part B in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solution of the present utility model will be further described in detail below in conjunction with the drawings and the specific embodiments.

[0018] Embodiment

[0019] As Figures 1 to 3 shown, this embodiment proposes a three-metal brake drum, including a flange portion 1 and a rim portion 2. The rim portion is integrally connected to the right end of the flange portion. The flange portion is a steel flange portion. The rim portion includes an inner vermicular graphite cast iron layer 21 and an outer ductile iron layer 22. The left end of the vermicular graphite cast iron layer extends to the inner side of the right end of the flange portion and is integrally combined with the inner surface of the right end of the flange portion.

[0020] Specifically, a groove 11 is provided on the right end face of the flange portion to improve the bonding strength between the right end face of the flange portion and the ductile iron layer. An annular heat dissipation groove 12 is provided on the outer circumferential surface of the right end of the flange portion. Concave pits (not shown in the figure) are evenly distributed on the outer circumferential surface of the ductile iron layer. The diameter of the concave pits is 2 mm and the depth is 1 mm, which is used to increase the contact area between the outer surface of the device and the air, that is, to increase the heat dissipation area of the device, thereby effectively improving its heat dissipation effect.

[0021] In this embodiment, a plurality of grooves 13 are provided on the inner surface of the right end of the flange portion combined with the vermicular graphite cast iron layer. Specifically, the cross section of the groove is in the shape of a dovetail groove, which is used to improve the bonding strength between the inner surface of the right end of the flange portion and the vermicular graphite cast iron layer. The vermicular graphite cast iron layer and the ductile iron layer are combined with the flange portion by centrifugal casting, which further ensures the structural strength of the whole brake drum.

[0022] The flange portion at the left end of the present utility model is made by spinning with a steel material, and the vermicular graphite cast iron layer and the ductile iron layer at the right end are both centrifugally cast. During casting, the flange portion is first placed in a metal mold, and the outer ductile iron layer is first cast from the inner side of the metal mold, and then the inner vermicular graphite cast iron layer is cast, which helps to reduce the manufacturing cost of the brake drum and improve the manufacturing efficiency and tensile strength of the brake drum.

[0023] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A tri-metal brake drum, comprising a flange portion and a rim portion, wherein the rim portion is integrally connected to the right end of the flange portion, characterized in that: The flange part is a steel flange part, and the rim part includes an inner layer of a vermicular cast iron layer and an outer layer of a ductile cast iron layer. The left end of the vermicular cast iron layer extends to the inner side of the right end of the flange part and is integrated with the inner surface of the right end of the flange part.

2. The tri-metal brake drum according to claim 1, characterized in that: A groove is arranged on the right end surface of the flange part.

3. The tri-metal brake drum according to claim 1, characterized in that: An annular heat dissipation groove is arranged on the outer circumferential surface of the right end of the flange portion.

4. The tri-metal brake drum according to claim 1, characterized in that: The outer circumferential surface of the ductile iron layer is evenly provided with pits.

5. The tri-metal brake drum according to claim 4, characterized in that: The diameter of the pit is 2-5 mm and the depth is 1-3 mm.

6. The tri-metal brake drum according to claim 1, characterized in that: A plurality of grooves are arranged on the inner surface where the right end of the flange part is combined with the vermicular cast iron layer.

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