CN211852603U - A wear-resistant brake disc with straight grooves on the surface - Google Patents

Abstract

The utility model discloses a wear-resistant brake disc with straight grooves on the surface, comprising a brake disc base body and a brake disc mounting member, wherein the brake disc base body is two annular wear-resistant gray cast iron sheets arranged in parallel The two gray cast iron sheets are connected by a plurality of supporting ribs arranged in a ring. The friction surfaces on the outside of the two gray cast iron sheets and the two shoes on the brake disc rub against each other, and there are multiple straight grooves evenly distributed on the friction surface. The extension direction of the straight groove is inclined with the radial direction of the brake disc base to form an included angle, and both ends of the straight groove are not communicated with the inner and outer circular surfaces of the brake disc base. The utility model starts from the surface topography structure, sets straight grooves on the surface of the brake disc, so that it has a good heat dissipation effect, reduces the thermoplasticity of the brake disc by improving the braking heat dissipation efficiency, and finally enhances the resistance of the brake disc. grinding characteristics.

Description

A wear-resistant brake disc with straight grooves on the surface

technical field

The utility model belongs to the technical field of automobile parts, in particular to an automobile brake disc with straight grooves on the surface, which can effectively reduce the transmission of braking heat to the interior of the brake disc and improve the wear resistance of the brake disc.

Background technique

Brake disc is the main component of automobile braking system, which plays an important role in automobile braking and is closely related to automobile driving safety. At this stage, most automobile brake discs are ventilated and have no surface structure. The braking heat generated during the braking process is mainly dissipated through the ventilated structure of the brake disc. The sudden rise of the surface temperature of the moving disk causes the thermoplasticity of the gray cast iron material of the brake disk, which greatly reduces the wear resistance of the brake disk, reduces the braking performance of the driving vehicle, and induces safety hazards in automobile braking. According to media reports, in November 2018, Li drove a heavy-duty semi-trailer tractor along a 17-kilometer-long downhill section to the Lanzhou South Toll Station and collided with 31 vehicles in a row, causing a major road traffic accident; the cause of the accident was a long After continuous braking for a long time, the temperature of the brake disc rises sharply due to the poor heat dissipation effect, which in turn leads to a decrease in the braking effect and braking failure. It can be seen that the heat dissipation performance of the brake disc is improved and the heat dissipation caused by the accumulation of braking heat is reduced. The sudden rise in the temperature of the brake disc is particularly important to avoid the thermoplasticity of the brake disc and improve the braking performance of the vehicle.

Invention patent CN109519489A discloses a wear-resistant brake disc and its manufacturing method. Based on the surface modification technology, a braking surface is arranged on the surface of the brake disc substrate, and the braking surface is a diamond coating prepared by electroplating after high temperature vacuum treatment of diamond powder. layer; adding weight ratio of 5-10% nickel, 1-5% cobalt, 1-5% manganese, 1-3% titanium, 1-5% boron to diamond powder, high temperature (800-1000 ℃), vacuum ( Under the condition of 0.0001Pa), the surface of the brake disc substrate is coated with diamond mixed material by electroplating technology, so as to prepare and obtain a wear-resistant brake disc, so as to improve the service life of the brake disc, protect the brake disc from acid and alkali corrosion, and reduce the amount of friction. moving distance. Invention patent CN106624675A discloses a preparation method of a wear-resistant brake disc or brake drum, using high-strength aluminum alloy or magnesium alloy as the base material to make the brake disc, and using electroplating to form a film with a thickness of 40-60 Micron wear-resistant layer, the prepared brake disc has the advantages of good wear resistance and long service life. The wear-resistant brake discs involved in the above invention patents all use surface modification technology. Although the thermoplasticity of the brake disc is reduced to varying degrees and the wear-resistant characteristics of the brake disc are improved, the electroplating technology involved is not only complex in process. , The preparation cost is high, and the resulting electroplating solution rich in heavy metal ions is likely to cause environmental pollution. Therefore, it is necessary to start from the surface structure to develop an automobile brake disc with excellent thermoplastic resistance and wear resistance.

Utility model content

The technical problem to be solved by the utility model is to provide a wear-resistant brake disc with straight grooves on the surface. The brake disc starts from the surface topography structure, and sets straight grooves on the surface of the brake disc, so that it has good heat dissipation. The effect is to reduce the thermoplasticity of the brake disc by improving the braking heat dissipation efficiency, and finally enhance the wear resistance of the brake disc.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the present utility model is: a wear-resistant brake disc with straight grooves on the surface, which is characterized by comprising a brake disc base body and a brake disc mounting member, wherein the brake disc base body It is composed of two circular wear-resistant gray cast iron sheets arranged in parallel. The two gray cast iron sheets are connected by a plurality of supporting ribs arranged in an annular shape. rubbing against each other, a plurality of straight grooves are evenly distributed on the friction surface, and the extension direction of the straight grooves is inclined with the radial direction of the brake disc base to form an included angle, and the two ends of the straight grooves Neither is communicated with the inner and outer circular surfaces of the brake disc base.

Preferably, the distance between adjacent straight grooves is smaller than the width of the shoe.

Preferably, the included angle ranges from 35 degrees to 45 degrees.

Preferably, the straight groove is located in the middle of the friction surface, and the product of the extension length of the straight groove and the cosine of the included angle is equal to 1/2-2/3 of the difference between the inner and outer radii of the friction surface.

Preferably, the brake disc mounting member is a circular fixing plate, the center of the fixing plate is arranged in the axle hole matched with the axle of the automobile, and the brake disc fixing bolt holes are distributed around the axle hole.

Preferably, the support ribs extend radially along the base body of the brake disc, and ventilation channels are formed in adjacent support ribs.

The beneficial effects produced by the above technical solutions are:

(1) In the brake disc of the present invention, inclined straight grooves are added on the friction surface of the base body of the brake disc, which increases the heat dissipation area of the base body of the brake disc. The internal propagation of the matrix can effectively and quickly dissipate the braking heat generated during the braking process of the vehicle, preventing the increase of the braking temperature on the surface of the brake disc, thereby reducing the thermoplasticity of the brake disc and finally enhancing the wear resistance of the brake disc;

(2) The brake disc in the present utility model adds inclined straight grooves on the friction surface of the base body of the brake disc, which is formed by cutting and processing, and the wear-resistant coating is prepared on the surface of the brake disc by electroplating at the present stage. Compared with the technical method of the present invention, the utility model has the advantages of simple and convenient preparation process, low technical cost, and no environmental pollution;

(3) In the brake disc of the present invention, the two brake disc bases are of symmetrical structure, and support ribs are arranged in the middle to form a ventilated brake disc, so as to realize the rapid dissipation of braking heat.

Description of drawings

1 is a perspective view of the overall structure of the present utility model;

Fig. 2 is the front view of the present utility model;

Fig. 3 is the top view of the present utility model;

In the figure: 1. Brake disc base body; 2. Straight groove; 3. Supporting rib; 4. Brake disc mounting member; 5. Wheel axle hole; 6. Brake disc fixing bolt hole.

Detailed ways

In order to make the purpose and advantages of the present utility model more clearly presented, the present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

As shown in Figures 1, 2, and 3, a wear-resistant brake disc with straight grooves on the surface includes a brake disc base 1 and a brake disc mounting member 4, wherein the brake disc base 1 is two parallel It is composed of annular wear-resistant gray cast iron sheets, and the two gray cast iron sheets are connected by a plurality of supporting ribs 3 arranged in a ring. A plurality of straight grooves 2 are evenly distributed on the friction surface, and both ends of the straight grooves 2 are not communicated with the inner and outer circular surfaces of the brake disc base 1 .

The material of the brake disc base 1 in the present invention is gray cast iron with excellent wear resistance. Straight grooves 2 are set on the surface of the brake disc base 1 by cutting. The first angle between adjacent straight grooves 2 is α, the distal radius is R1, and the proximal radius is R2; the length of the straight grooves 2 is 30- 50 mm, width 3-10 mm, depth 3-6 mm; straight grooves 2 are evenly distributed in the circumferential direction of the brake disc base surface, and the distance between the straight grooves 2 is smaller than the width of the shoe. The extension direction of the straight groove 2 is inclined with the radial direction of the brake disc base body 1 to form an included angle, and the included angle ranges from 35 degrees to 45 degrees. The straight groove 2 is located in the middle of the friction surface, and the product of the extension length of the straight groove 2 and the cosine value of the included angle is equal to 1/2-2/3 of the difference between the inner and outer radii of the friction surface.

The two brake disc bases 1 on the wear-resistant brake disc are of symmetrical structure, and support ribs 3 are arranged in the middle. The support ribs 3 extend radially along the brake disc base 1, and ventilation holes are formed in the adjacent support ribs 3 to form Ventilated brake discs for quick dissipation of braking heat.

A brake disc mounting member 4 is arranged on the wear-resistant brake disc. The moving disc mounting member 4 is a circular fixing plate. The center of the fixing plate is arranged in the axle hole 5 matched with the axle of the automobile, and the wheel axle hole 5 is distributed around the brake disc. The fixing bolt holes 6 are used to realize the fixed installation of the brake disc base body 1 on the automobile wheel hub.

When driving, the brake disc base 1 rotates at high speed with the axle of the car. When braking (braking) is required in an emergency, the brake pedal of the car is depressed, and the brake disc base 1 is squeezed by the brake shoes. The friction force is generated on the surfaces of the two, which reduces the driving speed and generates a large amount of braking heat. The existence of the braking heat causes the surface temperature of the brake disc base 1 to rise suddenly, and is transmitted to the interior of the brake disc base 1. . The increase of the temperature of the brake disc base 1 is easy to make it thermoplastic, which reduces the wear resistance of the brake disc base 1 and causes the brake disc base 1 to fail in braking. The existence of the evenly distributed straight grooves 2 increases the heat dissipation area of the brake disc base body 1, can quickly dissipate the braking heat, hinder the transmission of the braking heat to the interior of the brake disc base body 1, thereby reducing the brake disc base body 1. The braking temperature of the base body 1 can effectively suppress the thermoplasticity of the base body 1 of the brake disc, so that it can maintain normal braking performance.

In addition, the designed brake disc base 1 has an outer diameter of 300 mm and an inner diameter of 180 mm, and the included angle between adjacent straight grooves 2 is set to 30°, that is, 12 straight grooves are evenly arranged on the entire brake disc base 1 Slot 2; the distal radius R1 is 130 mm, the proximal radius R2 is 110 mm; the length of the straight groove 2 is 38 mm, the width is 4 mm, and the depth is 3 mm; the included angle of the straight groove is 40°. The model and finite element simulation analysis of the brake disc are carried out. The results show that, at a driving speed of 30-120 km/h, compared with the ordinary brake disc (without straight grooves), the straight groove 2 is set. During the braking process of the brake disc base body 1, the stress does not appear to be concentrated, and the strain does not increase.

Therefore, when the brake disc is braked, the brake disc base body 1 is squeezed to generate frictional force, thereby reducing the rotational speed of the brake disc base body 1 . During this process, braking heat is generated, and the braking heat spreads to the inside of the brake disc base 1; the existence of the straight grooves 2 increases the heat dissipation area of the brake disc base 1, and effectively reduces the amount of braking heat to the brake disc. The internal propagation of the base body 1 can effectively reduce the thermoplasticity of the brake disc base body 1, and finally improve the wear resistance of the brake disc base body. Therefore, the main function of the straight grooves 2 is to dissipate the braking heat and effectively improve the wear resistance of the brake disc base 1 . The brake disc has a good heat dissipation effect, and the arrangement of the straight grooves will not increase the stress concentration and strain of the brake disc during the braking process, thereby ultimately improving the wear resistance by reducing the thermoplasticity of the brake disc.

Claims (6)

1. The utility model provides a wear-resisting brake disc that straight slot has on surface, its characterized in that includes brake disc base member (1) and brake disc installation component (4), and wherein brake disc base member (1) constitutes for two parallel arrangement's the wear-resisting grey cast iron piece of ring shape, connects through a plurality of support ribs (3) that the annular was arranged between two grey cast iron pieces, and the friction surface in two grey cast iron piece outsides rubs with two hoof pieces on the brake disc mutually, evenly distributed has a plurality of straight slot (2) on the friction surface, the extending direction of straight slot (2) with the radial line direction slope of brake disc base member (1), forms an contained angle, straight slot (2) both ends all not with brake disc base member (1) inside and outside disc intercommunication.

2. A wear-resistant brake disc having straight grooves on its surface according to claim 1, characterized in that the distance between adjacent straight grooves (2) is less than the width of the shoe.

3. A wear-resistant brake disc having straight grooves on its surface according to claim 1, wherein said included angle is in the range of 35 to 45 degrees.

4. A wear-resistant brake disc having straight grooves on its surface according to claim 1, 2 or 3, characterized in that the straight grooves (2) are located in the middle of the friction surface and the product of the straight grooves (2) extension and the cosine of the angle is equal to 1/2-2/3 of the difference between the inner and outer radii of the friction surface.

5. A wear-resistant brake disc with straight grooves on the surface according to claim 1, wherein the brake disc mounting member (4) is a circular fixing plate which is centrally disposed in the axle hole (5) for the axle of the vehicle, and brake disc fixing bolt holes (6) are distributed around the axle hole (5).

6. A wear-resistant brake disc with straight grooves on the surface according to claim 1, characterized in that the support ribs (3) extend radially along the brake disc base body (1) and ventilation openings are formed in adjacent support ribs (3).

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