CN210128033U

CN210128033U - Automobile brake disc and vehicle

Info

Publication number: CN210128033U
Application number: CN201822086271.XU
Authority: CN
Inventors: 冯昌川; 孙垒; 王智文; 史东杰; 方泓; 焦孟旺
Original assignee: BAIC Motor Co Ltd; Beijing Automotive Research Institute Co Ltd
Current assignee: BAIC Motor Co Ltd; Beijing Automotive Group Co Ltd; Beijing Automotive Research Institute Co Ltd
Priority date: 2018-12-12
Filing date: 2018-12-12
Publication date: 2020-03-06
Anticipated expiration: 2028-12-12

Abstract

The utility model discloses an automobile brake disc and vehicle, automobile brake disc includes brake disc base member (1) and WC-Co-Cr wearing layer (2), has covered wearing layer (2) respectively on two annular working faces of brake disc base member (1), and the wearing layer thickness is 1-3 mm. The brake disc matrix adopts SiC particle reinforced aluminum alloy composite material, and the wear-resistant layer is a WC-Co-Cr coating prepared by a thermal spraying process. And performing decontamination treatment and sand blasting treatment before thermal spraying, wherein the surface roughness of the matrix after sand blasting is controlled to be Ra5-8 μm. The utility model discloses an automobile brake disc is including the WC-Co-Cr coating that has excellent wearability, and its wearing and tearing will reduce 60-80% than SiC granule reinforcing aluminum alloy composite brake disc, reduce 20-30% than traditional grey cast iron brake disc to have higher bonding strength and fatigue life.

Description

Automobile brake disc and vehicle

Technical Field

The utility model relates to an automobile brake field, concretely relates to automobile brake disc and vehicle.

Background

With the increasing requirements of energy conservation and environmental protection and the overall performance of automobiles, the lightweight of automobiles becomes an important direction for the development of the automobile industry. The automobile is light, especially the light of unsprung parts, can show the oil consumption reduction, promotes whole car and controls performance, brake performance and NVH performance.

The brake disc belongs to automobile unsprung parts, and the weight reduction thereof has an obvious effect of improving the performance of the whole automobile. However, the brake disc material still mainly comprises gray cast iron and cast steel, and the parts are heavy. In order to meet the braking performance of vehicles, the material of the automobile brake disc is required to have the characteristics of stable friction coefficient, high heat conductivity coefficient, high hardness, excellent fatigue performance and the like.

Research is being conducted at home and abroad on the application of aluminum alloy matrix composite materials to replace iron materials to realize the lightweight of the brake disc. The density of the aluminum alloy is only one third of that of steel, the aluminum alloy has excellent thermal conductivity, and the heat transfer coefficient of the aluminum alloy is more than 3 times that of the steel. The aluminum alloy brake disc prepared by powder metallurgy sintering has tensile strength of more than 250Mpa and excellent toughness. However, the aluminum alloy itself has a low melting point, and if the aluminum alloy composite material is directly used as the friction surface, high friction heat is generated when the vehicle is frequently braked, which may cause thermal deformation or thermal expansion of the friction surface, thereby reducing the braking force and being difficult to meet the braking performance requirement of the vehicle under severe working conditions.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the prior art, the disclosed purpose is to provide an automobile brake disc, which has the advantages of light weight, good wear resistance, good heat conductivity and the like, and meets the braking performance indexes of the whole automobile and the test requirements of a part rack system.

In order to achieve the above object, a first aspect of the present disclosure provides an automotive brake disc, which includes a brake disc base body, wherein two annular working surfaces of the brake disc base body are respectively covered with a wear-resistant layer, and the wear-resistant layer is a WC — Co — Cr layer.

Optionally, the wear resistant layer is a WC-Co-Cr thermal spray coating.

Optionally, the WC-Co-Cr thermal spray coating has a thickness of 1-3 mm.

Optionally, the material of the brake disc matrix is a SiC particle reinforced aluminum alloy composite material.

Optionally, the working surface comprises a sandblasted surface having a roughness Ra of 5-8 μm.

Optionally, the brake disc base body is centrally provided with a central hole for fixing with a brake shaft of an automobile and a plurality of bolt holes uniformly distributed around the central hole.

In a second aspect of the present disclosure, a vehicle is provided, which includes the automotive brake disc.

Through the technical scheme, the automobile brake disc comprises a wear-resistant layer covering the surface of a working surface, and the wear-resistant layer is limited to be a WC-Co-Cr layer; the WC-Co-Cr wear-resistant layer has good wear resistance, high surface bonding strength with an automobile brake disc matrix, excellent corrosion resistance and good appearance quality, thereby improving the wear resistance of the automobile brake disc and prolonging the service life of the brake disc. The automobile brake disc containing the WC-Co-Cr wear-resistant layer has excellent corrosion resistance and wear resistance, and the service life of the brake disc is prolonged.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic structural view of one embodiment of an automotive brake rotor according to the present disclosure.

Fig. 2 is a cross-sectional view taken along the plane a-a in fig. 1.

Description of the reference numerals

1-a brake disc base body; 2-a wear resistant layer; 3-bolt holes; 4-center hole

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, use of directional words such as "upper, lower, left, right" generally means that the brake disc of the present disclosure is defined in a normal use state, and "inner and outer" generally means inner and outer of the corresponding profile.

In a first aspect of the present disclosure, a brake disc is provided, which may include a brake disc base 1 and a wear layer 2, as shown in fig. 1 and 2. Two annular working surfaces of the brake disc substrate 1 are respectively covered with a wear-resistant layer 2, and the wear-resistant layer 2 can be a WC-Co-Cr layer.

The inventors of the present disclosure found that the WC-Co-Cr layer has excellent wear resistance, and the wear resistance thereof is reduced by 60 to 80% compared to a brake disc of SiC particle reinforced aluminum alloy composite material and 20 to 30% compared to a conventional gray cast iron brake disc, thereby obtaining the present disclosure.

The automobile brake disc comprises a wear-resistant layer covering the surface of a working surface, wherein the wear-resistant layer is defined as a WC-Co-Cr layer; the WC-Co-Cr wear-resistant layer has good wear resistance, high surface bonding strength with an automobile brake disc matrix, excellent corrosion resistance and good appearance quality, thereby improving the wear resistance of the automobile brake disc and prolonging the service life of the brake disc. The automobile brake disc containing the WC-Co-Cr wear-resistant layer has excellent corrosion resistance and wear resistance, and the service life of the brake disc is prolonged.

The WC-Co-Cr layer may be of a type conventional in the art, for example, containing a WC-Co-Cr composite, and preferably, the WC-Co-Cr layer may contain a WC-Co-Cr composite powder, in accordance with the present disclosure. The WC-Co-Cr composite material may be of a type conventional in the art, and in one embodiment, the WC-Co-Cr composite material may contain cobalt, chromium, and tungsten carbide, wherein the cobalt may be present in an amount of 6-20% by weight, the chromium may be present in an amount of 2-10% by weight, and the balance tungsten carbide.

In one embodiment of the present disclosure, the wear resistant layer 2 may be a WC-Co-Cr thermal spray coating. In this embodiment, the WC-Co-Cr thermal spray coating has uniform particles, a compact wear-resistant layer and high mechanical strength, and is beneficial to maintaining the strength of an automobile brake disc and improving the wear resistance; and the process of spraying the wear-resistant layer on the working surface has small heat influence on the brake disc matrix 1, the brake disc matrix is not easy to deform, the process operation procedure is simple, and the manufacturing efficiency is improved. Further, the WC-Co-Cr thermal spray coating may be a WC-Co-Cr flame spray coating, a WC-Co-Cr plasma spray coating, or a WC-Co-Cr arc spray coating, or a combination of two or three of them. The thermal spray coating can be prepared by a thermal spray process conventional in the art, such as thermal spray coating with a WC-Co-Cr thermal spray powder, and the thermal spray process can be flame spray, plasma spray, or arc spray.

The thickness of the WC-Co-Cr thermal spray coating may vary over a wide range according to the present disclosure, and may be adjusted depending on actual brake disc wear performance requirements. In one embodiment, the WC-Co-Cr thermal spray coating may have a thickness of 1 to 3mm, preferably 1.5 to 2.5mm, and within the preferred thickness range described above, automotive brake discs have good wear resistance, and suitable weight and mechanical properties.

According to the present disclosure, the material of the brake disc substrate 1 may be conventional in the art, preferably, the brake disc substrate is a SiC particle reinforced aluminum alloy composite material, and the SiC particle reinforced aluminum alloy composite material brake disc substrate has good thermal conductivity and fatigue resistance, and can ensure that frictional heat generated by braking is dispersed when the brake disc works, so that the brake disc does not generate failures such as thermal cracks, thermal fading and the like. Among them, the method of producing the brake disk substrate 1 from the SiC particle-reinforced aluminum alloy composite material may also be conventional in the art, for example, the brake disk substrate 1 is produced from the SiC particle-reinforced aluminum alloy composite material by powder metallurgy.

In order to improve the bonding strength of the wear layer and the working surface of the brake disc substrate, the adhesion strength is improved by mechanical engagement and metallurgical bonding, in one embodiment of the disclosure, the working surface may comprise a sand blast surface; further, the roughness Ra of the sandblasted surface may be 5 to 8 μm, preferably 6 to 7 μm. Where the blasted surface may be conventional in the art, it refers to the surface of the work surface that has been subjected to blasting. The sand blasting can be carried out by a method conventional in the field, for example, before thermal spraying, the surface to be sprayed is wiped by acetone to remove oil stains, a tool is used for protecting the non-spraying surface of the brake disc, and the sand blasting is carried out by adopting a material of No. 50-100 white corundum.

In order to increase the firmness of fixing the brake disc base body 1 on the hub, in one specific embodiment of the present disclosure, the center of the brake disc base body 1 is provided with a central hole 4 for fixing with a brake shaft of an automobile and bolt holes 3 uniformly distributed around the central hole; further, the number of bolt holes 3 with evenly distributed central holes can be a plurality, preferably 6-8. The method for fixing the brake disc base body 1 on the hub is also conventional in the art, and means that the brake disc base body is sleeved on the brake shaft of the automobile through the central hole, and the brake disc base body 1 can be fixed on the hub of the automobile through the plurality of bolt holes 3.

In a second aspect of the present disclosure, a vehicle is provided, which includes a brake disc as described in an aspect of the present disclosure.

The automobile brake disc disclosed by the invention can be prepared by adopting the following method:

the brake disc substrate 1 is made of SiC particle reinforced aluminum alloy composite material through powder metallurgy, the brake disc substrate made of the SiC particle reinforced aluminum alloy composite material has good thermal conductivity and fatigue resistance, and friction heat generated by braking can be dispersed when the brake disc works, so that the brake disc cannot generate failures such as thermal cracks, thermal fading and the like.

The wear-resistant layer 2 is a WC-Co-Cr coating prepared by thermal spraying corrosion prevention. The method comprises the steps of pretreating before thermal spraying, wiping the surface to be sprayed with acetone to remove oil stains, protecting the non-spraying surface of a brake disc by using a tool, carrying out sand blasting treatment by using 50-100# white corundum as a material, and controlling the surface roughness Ra to be 5-8 mu m after sand blasting. The hot spraying material is WC-Co hot spraying powder, wherein the weight ratio of cobalt: 6-20%, chromium: 2-10% and the balance carbide. The thermal spraying process may employ flame spraying, plasma spraying or electric arc spraying. The thickness of the WC-Co-Cr wear-resistant layer can be set to be 1-3mm according to the requirement of the actual wear-resistant performance of the brake disc. The wear-resistant layer and the aluminum alloy composite material matrix are combined through mechanical occlusion and metallurgy to achieve extremely high adhesion strength, so that the brake disc has good wear resistance and fatigue life.

The preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and all other embodiments may be obtained by those skilled in the art without inventive efforts, and the simple modifications are within the protective scope of the present disclosure.

Claims

1. An automobile brake disc, characterized in that the automobile brake disc comprises a brake disc substrate (1), wherein two annular working surfaces of the brake disc substrate (1) are respectively covered with a wear-resistant layer (2), the wear-resistant layer (2) is a WC-Co-Cr layer, the wear-resistant layer (2) is a WC-Co-Cr thermal spraying layer, and the thickness of the WC-Co-Cr thermal spraying layer is 1-3 mm; the working surface comprises a sand blasting surface, and the roughness Ra of the sand blasting surface is 5-8 mu m.

2. Automotive brake disc according to claim 1, characterized in that the material of the brake disc matrix (1) is a SiC particle reinforced aluminium alloy composite.

3. The automotive brake disc according to claim 1, characterized in that the centre of the disc base (1) is provided with a central hole (4) for fixing with the braking shaft of the automobile and a plurality of bolt holes (3) evenly distributed around the central hole.

4. A vehicle, characterized in that it comprises a motor vehicle brake disc according to any one of claims 1 to 3.