A new type of lightweight bimetallic brake drum

Abstract

The application discloses a novel lightweight bimetallic brake drum, which comprises an outer shell, reinforcing ribs are designed on the circumferential part of the outer shell, an annular reinforcing band is designed on the large end face of the outer shell, a plurality of groups of fixing holes are uniformly arranged on the circumferential annular part of the outer shell, a plurality of friction plates are installed on the inner wall of the outer shell, the outer shell is made of steel material, the friction plates are made of high-carbon wear-resistant gray cast iron material or ceramic material, the friction plates are in an arc shape, counterbores are designed on the surfaces of the friction plates, no less than three friction plates are arranged in a single outer shell, a gap is reserved between two adjacent friction plates, the outer shell and the friction plates are connected and fixed through fasteners, and the threads of the fasteners are coated with thread locking agents. The application has the advantages of lightweight design, light weight, reduction of about 20%-30% of a traditional brake drum, consideration of fuel consumption, long service life, prevention of cracking of the brake drum due to heat recession of a brake motor, influence on driving safety and reduction of maintenance cost in the later period.

Description

Technical Field

[0001] This invention relates to the field of brake drum technology, specifically a novel lightweight bimetallic brake drum. Background Technology

[0002] A brake drum is a device connected to the wheel hub and used in conjunction with brake pads to achieve braking. It is a key component in a drum brake assembly. Existing brake drums include a brake face and a flange face (with bolt holes on the flange face). The bolt holes on the flange face are connected to the wheel hub by fasteners.

[0003] Existing brake drums have a relatively traditional structure and poor heat dissipation, which leads to intense friction between the brake surface and brake pads during braking, generating a large amount of heat. Due to the inability to dissipate heat effectively, this results in brake surface thermal fade and cracking, affecting the service life of the brake drum. Summary of the Invention

[0004] The purpose of this invention is to provide a novel lightweight bimetallic brake drum to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel lightweight bimetallic brake drum, comprising a shell, wherein the circumferential portion of the shell is designed with reinforcing ribs, the large end face of the shell is designed with an annular reinforcing band, the shell is provided with multiple sets of fixing holes evenly spaced in the circumferential direction, and multiple friction pads are installed on the inner wall of the shell.

[0006] Preferably, the outer casing is made of steel.

[0007] Preferably, the friction pad is made of high-carbon, wear-resistant gray cast iron or ceramic material.

[0008] Preferably, the friction pad is arc-shaped, and countersunk holes are designed on the surface of the friction pad. No less than 3 friction pads are provided in a single housing, and a gap is left between two adjacent friction pads.

[0009] Preferably, the outer shell and the friction plate are connected and fixed by fasteners, the threads of the fasteners are coated with thread-locking agent, and the end face of the fasteners is embedded in the countersunk hole of the friction plate.

[0010] Preferably, the distance between the end face of the fastener and the inner surface of the friction surface of the friction plate is greater than 2 mm.

[0011] Preferably, the outer casing has multiple bolt holes circumferentially formed at each end.

[0012] Preferably, the outer casing has multiple flange holes circumferentially formed at each end, and flanges are provided at the flange holes.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The structural design was optimized by changing from a single material to a bimetallic material. The brake drum shell and flange face are both made of steel to improve strength, reduce wall thickness, and reduce weight. The friction pads (brake surfaces) are made of gray cast iron or ceramic. The friction pads are evenly divided circumferentially. There are blind holes on the shell and countersunk holes on the friction pads. The friction plates and the housing are connected by fasteners. The threads of the fasteners are coated with thread-locking agent, which has the characteristics of resisting vibration and high temperature. At the same time, a gap is left between two adjacent friction plates to facilitate installation. (3) The present invention features a lightweight design, which is about 20%-30% lighter than traditional brake drums. It also takes into account fuel consumption and has a long service life. Because the outer shell is made of steel, the brake drum will not crack due to brake fade, thus affecting driving safety and reducing later maintenance costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the AA cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the left-side structure of the present invention; Figure 4 This is a schematic diagram of the right-side structure of the present invention; Figure 5 This is a schematic diagram of the friction plate structure of the present invention; Figure 6 This is a three-dimensional structural diagram of the present invention; Figure 7 This is a schematic diagram of the main cross-sectional structure of the present invention; Figure 8 This is a schematic diagram of the N-part structure of the present invention; Figure 9 This is an exploded view of the present invention.

[0015] In the diagram: 1. Outer shell; 2. Fixing hole; 3. Bolt hole; 4. Flange hole; 5. Flange; 6. Reinforcing strip; 7. Countersunk hole; 8. Friction plate; 9. Fastener; 10. Gap; 11. Reinforcing rib. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1-9The present invention provides a technical solution: a novel lightweight bimetallic brake drum, comprising a shell 1, a reinforcing rib 11 designed in the circumferential part of the shell 1, an annular reinforcing band 6 designed in the large end face of the shell 1, and multiple sets of fixing holes 2 uniformly opened in the circumferential ring of the shell 1. The fixing holes 2 are designed in the inner side of the reinforcing rib 11, and are evenly distributed in the circumferential direction. The number is designed as needed. Multiple friction plates 8 are installed on the inner wall of the shell 1.

[0018] In this invention, the outer shell 1 is made of steel and can be formed by cold rolling or hot rolling. Its structural features include thin walls, a brake drum flange that is reduced by about 1 / 2 compared to the traditional brake drum flange, and a weight reduction of about 20%-30% compared to the traditional brake drum.

[0019] In this invention, the friction plate 8 is made of high-carbon wear-resistant gray cast iron or ceramic material. Gray cast iron has the characteristics of wear resistance and good heat dissipation, while ceramic plate has the characteristics of high strength and light weight.

[0020] In this invention, the friction plate 8 is arc-shaped, and the surface of the friction plate 8 is designed with countersunk holes 7. No less than 3 friction plates 8 are provided in a single outer shell 1. A gap 10 is left between two adjacent friction plates 8. By setting the gap, the friction plate is prevented from generating high temperature during operation, which would cause the material to expand. The gap is reserved to prevent material deformation caused by thermal expansion.

[0021] In this invention, the outer shell 1 and the friction plate 8 are connected and fixed by fasteners 9. The threads of the fasteners 9 are coated with thread-locking agent, which has the characteristics of resisting vibration and high temperature. The end face of the fasteners 9 is embedded in the countersunk hole 7 of the friction plate 8.

[0022] In this invention, the distance between the end face of the fastener 9 and the inner side of the friction surface of the friction plate 8 is greater than 2mm. When the friction plate is worn and approaches the end face of the fastener, it indicates that the friction plate has reached the end of its service life, prompting replacement to ensure driving safety.

[0023] In this invention, the outer casing 1 has multiple bolt holes 3 arranged in a ring at each end.

[0024] In this invention, the outer shell 1 has multiple flange holes 4 circumferentially formed at its ends, and a flange 5 is provided at each flange hole 4.

[0025] This invention features a steel outer shell 1 with thin walls, reducing the flange size by approximately half compared to traditional brake drum flanges. Reinforcing ribs 11 are designed around the circumference of the outer shell 1, and an annular reinforcing band 6 is designed on the large end face. Fixing holes 2 are evenly distributed on the connecting ribs. Friction pads 8 can be made of high-carbon, wear-resistant gray cast iron or ceramic materials. Gray cast iron is wear-resistant and has good heat dissipation, while ceramic pads are high-strength and lightweight. The friction pads 3 are arc-shaped with connecting holes (counter-holes) on their surface. Each brake drum requires at least three friction pads 8. A gap 10 is left between two adjacent friction plates 8 (the friction plates 8 generate high temperatures during operation, causing the material to expand; the gap 10 is reserved to prevent material deformation due to thermal expansion). The outer shell 1 and the friction plates 8 are connected and fixed by fasteners 9. The threads of the fasteners 9 are coated with thread-locking agent, which has the characteristics of vibration resistance and high temperature resistance. The end face of the fastener 9 is embedded in the countersunk hole 7 of the friction plate 8. After installation, the distance between the end face of the fastener 9 and the inner side of the friction surface is greater than 2mm. When the friction plate 8 is worn and approaches the end face of the fastener 9, it indicates that the friction plate 8 has reached the end of its service life, prompting replacement to ensure driving safety.

[0026] The contents not described in detail in this specification are prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel lightweight bimetallic brake drum, characterized in that: Includes a shell (1), the shell (1) is designed with reinforcing ribs (11) in the circumferential part, the shell (1) is designed with an annular reinforcing band (6) in the large end face part, the shell (1) is evenly provided with multiple sets of fixing holes (2) in the circumferential ring, and multiple friction plates (8) are installed on the inner wall of the shell (1).

2. The novel lightweight bimetallic brake drum according to claim 1, characterized in that: The outer shell (1) is made of steel.

3. The novel lightweight bimetallic brake drum according to claim 1, characterized in that: The friction plate (8) is made of high-carbon wear-resistant gray cast iron or ceramic material.

4. A novel lightweight bimetallic brake drum according to claim 1, characterized in that: The friction plate (8) is arc-shaped, and a countersunk hole (7) is designed on the surface of the friction plate (8). No less than 3 friction plates (8) are provided in a single housing (1), and a gap (10) is left between two adjacent friction plates (8).

5. A novel lightweight bimetallic brake drum according to claim 4, characterized in that: The outer shell (1) and the friction plate (8) are connected and fixed by fasteners (9). The threads of the fasteners (9) are coated with thread-locking agent, and the end face of the fasteners (9) is embedded in the countersunk hole (7) of the friction plate (8).

6. A novel lightweight bimetallic brake drum according to claim 5, characterized in that: The distance between the end face of the fastener (9) and the inner surface of the friction surface of the friction plate (8) is greater than 2mm.

7. A novel lightweight bimetallic brake drum according to claim 1, characterized in that: The outer casing (1) has multiple bolt holes (3) circumferentially formed at its ends.

8. A novel lightweight bimetallic brake drum according to claim 1, characterized in that: The outer shell (1) has multiple flange holes (4) circumferentially opened at its ends, and a flange (5) is provided at the flange hole (4).

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