CN221145116U - Carbon ceramic brake disc - Google Patents

Abstract

The application relates to a carbon ceramic brake disc, and relates to the technical field of brake parts. The carbon ceramic brake disc comprises a disc-shaped disc body and a cylindrical closing head, wherein the middle part of the disc body is provided with a mounting hole, the inner end of the closing head is inserted into the mounting hole of the disc body, and the outer end of the closing head is provided with a connecting part for connecting with a vehicle hub; a first limit structure is arranged on the hole wall of the mounting hole along the circumferential direction, and a second limit structure is arranged on the outer circumferential surface of the inner end of the joint along the circumferential direction; the first limit structure and the second limit structure are matched and connected to form a circumferential limit structure for limiting the relative rotation of the disc body and the joint. The carbon ceramic brake disc has a simple structure, reduces the process difficulty and the manufacturing cost, can meet the high-torque performance requirement, and has wider applicability.

Description

Carbon ceramic brake disc

Technical Field

The application relates to the technical field of brake parts, in particular to a carbon ceramic brake disc.

Background

Brakes are components used in braking systems to generate braking forces that retard the motion or movement tendency of a vehicle. In addition to various retarder devices, most of the automobile brakes are friction brakes that generate braking torque by friction between a fixed element and a working surface of a rotating element. Currently, friction brakes widely used for various automobiles are classified into two main types, drum type and disc type, according to the difference of rotary elements. The difference between them is that: the rotary element in the friction pair of the drum brake is a brake drum, and the cylindrical surface of the rotary element is used as a working surface; the rotary element in the friction pair of the disc brake is a disc-shaped brake disc, and the end face of the rotary element is used as a working surface. The brake disc, as a friction partner of the disc brake, should have a stable friction coefficient as high as possible, and appropriate wear resistance, heat dissipation, heat capacity, and the like, in addition to the strength and rigidity required as a member.

The brake disc is fixed on the hub by bolts and rotates together with the wheel. During braking, the brake block of the brake caliper presses the brake disc to generate a resisting moment, so that the ground generates a ground braking force for the automobile, and the automobile is decelerated and stopped. From principle analysis of conservation of energy, this process is actually a process of converting kinetic energy into thermal energy. In the braking process, a large amount of heat is generated on the brake disc, and the friction coefficient of the brake disc is reduced in a high-temperature state, so that the safety coefficient of the brake disc is reduced, and the braking feeling, noise, dust, smoke, smell and the like are obvious when the brake disc starts to heat fade. This requires a good heat dissipation effect of the brake disc, and a large torque is required to be applied to the connection portion between the brake disc and the vehicle body, and the torque bearing capacity is increased as the vehicle speed and the vehicle weight are increased.

There are three main brake disc solutions currently in use and under investigation: the first type of brake disc is mainly a gray cast iron brake disc which is actually used at present, and in the actual use of commercial vehicles and passenger vehicles, a serious heat fading phenomenon can occur on the gray cast iron brake disc at a higher temperature, the induced braking force is insufficient, the brake failure and other problems are caused, and serious traffic accidents can be caused by the problems; the second type is a sandwich structure type carbon ceramic brake disc, the structure is very complex, the processing cost is higher, the dimensional deviation of flatness, runout value and the like of two friction surfaces after assembly is larger, and the brake torque fluctuation phenomenon is obvious in the actual bench test; the third type is also a carbon ceramic brake disc, the joint of which is directly connected with carbon Tao Panti through bolts and nuts, and the main application scene is on a passenger car, and the torque required by the commercial car cannot be generally achieved.

Disclosure of utility model

The application provides a carbon ceramic brake disc, which aims to improve the torque bearing capacity of the carbon ceramic brake disc and the processing convenience of the carbon ceramic brake disc.

The application provides a carbon ceramic brake disc which adopts the following technical scheme:

The carbon ceramic brake disc comprises a disc-shaped disc body and a cylindrical joint, wherein a mounting hole is formed in the middle of the disc body, the inner end of the joint is inserted into the mounting hole of the disc body, and the outer end of the joint is provided with a connecting part for being connected with a vehicle hub; a first limit structure is arranged on the hole wall of the mounting hole along the circumferential direction, and a second limit structure is arranged on the outer circumferential surface of the inner end of the closing head along the circumferential direction; the first limiting structure and the second limiting structure are matched and connected to form a circumferential limiting structure for limiting the relative rotation of the tray body and the joint.

The outer end of the joint is fixed on the hub by a connecting part and a bolt, and the joint and the disc body rotate together with the wheel. During braking, the brake block of the brake caliper presses the disc body to generate a resisting moment, so that the ground generates a ground braking force on the automobile, and the automobile is decelerated and stopped. According to the technical scheme, the brake disc adopts a single-layer structure, is fixedly connected with the joint in the circumferential direction, has a simple processing technology, is convenient to assemble and has low production and manufacturing cost; meanwhile, the first limiting structure and the second limiting structure which are matched form a clamping limiting connection, so that relative rotation between the disc body and the closing head is limited, stable reliability of torque transmission is enhanced, and high torque performance requirements are met. The carbon ceramic brake disc can be used for common small cars and certain car types with large weight and inertia (such as commercial cars), and has the advantages of good universality and applicability, stability, reliability and high safety.

Optionally, the first limiting structure is a plurality of spline grooves formed in the wall of the mounting hole; the second limiting structure is a plurality of spline teeth arranged on the outer peripheral surface of the inner end of the closing head; the spline teeth are embedded in the spline grooves.

Through adopting above-mentioned technical scheme, spline cooperation forms circumference limit structure, effectively prevents to close and skid between head and the disk body in the braking process, can bear higher moment of torsion to the stability and reliability of braking have been guaranteed. Meanwhile, the system can be suitable for more vehicle types with large vehicle weight and inertia.

Optionally, an annular spline groove ring is arranged in the mounting hole, the spline groove ring and the disc body are integrally formed, and the spline groove is formed in the inner wall of the spline groove ring; the number of spline grooves is the same as that of spline teeth, and at least twenty spline grooves are formed in the same, all spline grooves are uniformly distributed at intervals along the circumferential direction of the spline groove ring, and the spline grooves and the spline teeth are arranged in one-to-one correspondence.

By adopting the technical scheme, when braking, the torsion is uniformly dispersed in the circumferential direction of the closing head and the disc body, the stability of torque transmission is improved, and the stress concentration is prevented from generating cracking or damage.

Optionally, the tray body is made of carbon fiber, and the joint is made of aluminum alloy or gray cast iron.

By adopting the technical scheme, the weight of the whole brake disc is reduced; the tray body can be made of carbon fiber of T700 grade or other strength grade through deposition, high temperature and siliconizing; according to different budgets and weight reduction requirements, different materials are selected for joint; when the budget is high, the important requirement for reduction is that 7075 aluminum alloy materials can be selected to meet the requirement of light weight of the carbon ceramic brake disc assembly, and compared with an iron disc, the weight of the carbon ceramic brake disc assembly can be reduced by about 60%; when the budget is low, HT250 gray cast iron or QT450-T10 material can be selected, and the weight can be reduced by about 20-30% compared with a steel plate.

Optionally, an annular gasket or an arc-shaped gasket is fixedly arranged on the end face of the inner end of the closing head, and the annular gasket and the arc-shaped gasket are fixedly connected to the end part of the spline teeth of the closing head or/and the end face of the spline groove ring of the disc body through fasteners.

The annular gasket is a complete ring, and the arc gasket is semicircle or 1/4 ring, through adopting above-mentioned technical scheme, annular gasket or arc gasket that sets up is used for increasing the area of installation junction surface, better prevent that the disk body from taking place axial float. The selection principle is as follows: the generally used annular gasket is a whole ring with the diameter of 5mm and 6mm, and if the condition of smaller torque exists, a semicircular ring or a 1/4 circular ring can be selected so as to save the material cost.

Optionally, the width of the spline groove ring is smaller than the thickness of the disc body, and a first step groove is formed between two sides of the spline groove ring and the hole wall of the mounting hole; the length of the spline teeth is smaller than that of the spline grooves, and second step grooves are formed between the end faces of the spline teeth and the side faces of the spline grooves; the annular gasket and the arc-shaped gasket are embedded in the first step groove or the second step groove.

Through adopting above-mentioned technical scheme, annular gasket and arc gasket pass through connecting screw fixed mounting on spline tooth tip or/and spline groove circle terminal surface, annular gasket, arc gasket and screw all can not bulge in the side of disk body this moment, can enough promote the aesthetic property, also can avoid annular gasket, arc gasket and screw to interfere with other parts such as brake caliper simultaneously.

Optionally, the connecting portion includes a plurality of setting up on closing the outer peripheral face of head outer end the lobe, a plurality of the lobe is followed closing the even interval distribution of outer end circumference of head, every the connecting hole that runs through the lobe both sides has been seted up on the lobe.

By adopting the technical scheme, the plug bolt is convenient to connect parts such as a hub of a vehicle and the like, and meanwhile, the plug bolt can be conveniently processed, and the light weight is realized while the connection strength is ensured, so that the material is saved, and the cost is reduced.

Optionally, a plurality of ventilation through slots extending from the wall of the mounting hole to the outer peripheral surface of the tray body are formed in the tray body, or heat dissipation through holes penetrating through two sides of the tray body are formed in the tray body.

Through adopting above-mentioned technical scheme, when the disk body is rotatory, outside air current can flow through ventilation through groove or ventilation through groove, and at this in-process, air carries out the heat exchange with the disk body to take away the heat on the disk body, play better ventilation radiating effect.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Compared with a cast iron brake disc, the carbon ceramic brake disc disclosed by the application has no obvious heat fading phenomenon, can bear higher braking temperature, can realize emergency braking under the conditions of long downhill slope, full load overload and the like, and has almost no attenuation of the friction coefficient; and carbon Tao Caizhi is more wear-resistant, so that the service cycle and the safety coefficient are greatly improved.

2. Compared with the traditional passenger car carbon Tao Panjie structure, the structure of the carbon ceramic brake disc body adopts a single-layer structure, the structure is simpler, the difficulty of a manufacturing process is reduced, the assembly is simpler, and the manufacturing cost is saved; and when the limit working condition is damaged, the maintenance and the replacement are convenient.

3. According to the application, the joint of the carbon ceramic brake disc and the disc body are in spline fit to form a circumferential limit structure, so that the torque transmission performance of the joint between the joint and the disc body is improved, and the requirement of higher torque bearing performance can be met.

4. The joint of the carbon ceramic brake disc and the disc body are connected stably and reliably, so that the problems of resonance, shaking and the like in the braking process can be effectively reduced; but also more beautiful.

Drawings

Fig. 1 is a schematic view showing a first perspective structure of a carbon ceramic brake disc according to the present application.

Fig. 2 is a schematic view showing a second perspective structure of the carbon ceramic brake disc according to the present application.

Fig. 3 is a schematic diagram of an exploded structure of the carbon ceramic brake disc of the present application.

Fig. 4 is a schematic cross-sectional structure of a carbon ceramic brake disk in the present application.

In the figure:

10. A tray body; 11. a mounting hole; 12. a first limit structure; 121. spline grooves; 13. spline groove rings; 14. a first step groove; 15. a second step groove;

20. closing the head; 21. a connection part; 211. a lobe; 212. a connection hole; 22. a second limit structure; 221. spline teeth;

30. An annular gasket;

40. A fastener.

Detailed Description

The present application will be described in further detail with reference to fig. 1 to 4.

The carbon ceramic brake disc is mainly applied to an automobile brake system, for example, can be applied to a commercial automobile brake disc, and can also be applied to a traditional passenger car, an off-road car, a military car and a special car; of course, other mechanical devices incorporating the same or similar braking structure as the brakes of an automobile may be used.

Referring to fig. 1 and 2, the carbon ceramic brake disc of the present application comprises a disc-shaped disc body 10, wherein the disc body 10 is made of a carbon fiber reinforced silicon carbide-based composite material with a grade of T700 or other strength. Specifically, the tray 10 of the present application may be manufactured using a vapor deposition process (CVI) in combination with a melt-siliconizing process (LSI), or using a dip-cracking process (PIP) in combination with a melt-siliconizing process (LSI). The carbon fiber functions to provide the mechanical strength and fracture toughness required by the material, while the silicon carbide in the matrix determines the hardness of the composite material, and the whole disc 10 has the advantages of low density, high temperature resistance, high friction performance, low wear rate, good stability, long service life and the like. The friction coefficient of the carbon ceramic brake disc is about 0.35-0.4, and the carbon ceramic brake disc is used as a part in an automobile brake system, and has the advantages of stable dry and wet friction coefficient, small abrasion loss and mild braking.

The carbon ceramic brake disc also comprises a cylindrical joint 20, wherein the joint 20 is made of aluminum alloy or gray cast iron. When the budget is high, the important requirement for reduction is that 7075 aluminum alloy materials can be selected to meet the requirement of light weight of the carbon ceramic brake disc assembly, and compared with an iron disc, the weight of the carbon ceramic brake disc assembly can be reduced by about 60%; when the budget is low, HT250 gray cast iron or QT450-T10 material can be selected, and the weight can be reduced by about 20-30% compared with a steel plate.

Referring to fig. 1 and 2, the middle part of the tray body 10 is provided with a mounting hole 11, the inner end of the closing head 20 is inserted into the mounting hole 11 of the tray body 10, the outer end of the closing head 20 is provided with a connecting part 21 for being connected with a vehicle hub, the connecting part 21 comprises a plurality of convex corners 211 arranged on the outer peripheral surface of the outer end of the closing head 20, the convex corners 211 are uniformly distributed at intervals along the circumferential direction of the outer end of the closing head 20, and each convex corner 211 is provided with a connecting hole 212 penetrating through two sides of the convex corner 211, so that the closing head 20 is connected with the vehicle hub and other parts by an inserting bolt conveniently, meanwhile, the processing is convenient, the connecting strength is ensured, the light weight is realized, the materials are saved, and the cost is reduced.

Referring to fig. 2 and 3, a first limiting structure 12 is circumferentially arranged on the wall of the mounting hole 11, and a second limiting structure 22 is circumferentially arranged on the outer circumferential surface of the inner end of the joint 20; the first limiting structure 12 and the second limiting structure 22 are cooperatively connected to form a circumferential limiting structure for limiting the relative rotation of the tray body 10 and the joint 20. Specifically, the installation hole 11 is internally provided with an annular spline groove ring 13, the spline groove ring 13 and the disc body 10 are integrally formed, and the first limiting structure 12 is a plurality of spline grooves 121 formed on the inner wall of the spline groove ring 13; the second limiting structure 22 is a plurality of spline teeth 221 arranged on the outer peripheral surface of the inner end of the joint 20; spline teeth 221 are embedded in spline grooves 121. The number of spline grooves 121 is at least twenty as the number of spline teeth 221, and all spline grooves 121 are uniformly spaced circumferentially along spline ring 13, and spline grooves 121 and spline teeth 221 are arranged in one-to-one correspondence.

Alternatively, the spline groove ring 13 may be a spline gear ring, and the first limiting structure 12 may be a plurality of spline teeth formed on an inner wall of the spline gear ring; the second limiting structure 22 is a plurality of spline grooves arranged on the outer peripheral surface of the inner end of the joint 20; the two are matched to realize the purpose of the technical scheme.

Referring to fig. 2, 3 and 4, an annular gasket 30 or an arc-shaped gasket is fixedly arranged on the inner end surface of the joint 20, and the annular gasket 30 and the arc-shaped gasket are fixedly connected on the end parts of spline teeth 221 of the joint 20 or/and the end surface of a spline groove ring 13 of the disc body 10 through a fastener 40; the fastener 40 may be a connecting screw or rivet, or the like. The annular gasket 30 is a complete ring, the arc gasket is a semicircular ring or a 1/4 circular ring, and the arc gasket can also be an arc circular ring structure from 1/4 circular ring to the whole circular ring, and the annular gasket 30 or the arc gasket is used for increasing the area of an installation connecting surface and better preventing the disc body 10 from axial movement. The selection principle is as follows: the generally used annular gasket 30 is a full ring of 5mm and 6mm, and if a smaller torque exists, a semicircular ring or a 1/4 circular ring can be selected to save the material cost.

Referring to fig. 3 and 4, the spline groove ring 13 has a width smaller than the thickness of the disk 10, and a first step groove 14 is formed between both sides of the spline groove ring 13 and the wall of the mounting hole 11; the length of the spline teeth 221 is smaller than that of the spline grooves 121, and a second step groove 15 is formed between the end surface of the spline teeth 221 and the side surface of the spline groove ring 13; the annular gasket 30 and the arc-shaped gasket are embedded in the first step groove 14 or the second step groove 15. The annular gasket 30 and the arc-shaped gasket are fixedly arranged on the end parts of the spline teeth 221 or/and the end surface of the spline groove ring 13 through fasteners 40 such as connecting screws, and at the moment, the annular gasket 30, the arc-shaped gasket and the screws cannot protrude out of the side surface of the disc body 10, so that the attractiveness can be improved, and meanwhile, the annular gasket 30, the arc-shaped gasket and other parts such as a brake caliper can be avoided.

In the application, a plurality of ventilation through grooves extending from the wall of the mounting hole 11 to the outer peripheral surface of the tray body 10 can be formed on the tray body 10, or the tray body 10 is provided with heat dissipation through holes (not shown in the drawing) penetrating through two sides of the tray body 10. When the tray body 10 rotates, external air flows through the ventilation through grooves or the ventilation through grooves, and in the process, air exchanges heat with the tray body 10, so that heat on the tray body 10 is taken away, and a good ventilation and heat dissipation effect is achieved. Whether a ventilation and heat dissipation structure is required to be arranged, whether a ventilation through groove or a heat dissipation through hole is arranged is selected, and the selection is performed according to actual use working conditions and technical requirements.

The implementation principle is as follows: the outer end of the joint 20 is fixed to the hub by a connecting portion 21 and bolts, and the joint 20 and the disc 10 rotate together with the wheel. During braking, the brake blocks of the brake caliper press the disc body 10 to generate a resisting moment, so that the ground generates a ground braking force on the automobile, and the automobile is decelerated and stopped. The brake disc is made of carbon ceramic, and the disc body 10 is made of carbon Tao Caizhi, so that the brake disc has the advantages of low density, high temperature resistance, high friction performance, stability and the like; the tray body 10 adopts a single-layer structure, is fixedly connected with the closing head 20 in the circumferential direction, has simple processing technology and is convenient to assemble; meanwhile, the spline is matched to form a circumferential limiting structure, so that torsion is uniformly dispersed in the circumferential directions of the joint 20 and the disc body 10 during braking, the stability of torque transmission is improved, the stress concentration is prevented from generating cracking or damage, slipping between the joint 20 and the disc body 10 in the braking process can be effectively prevented, higher torsion can be borne, and the requirement of high-torque performance is met. The carbon ceramic brake disc can be used for common small cars and certain car types with large weight and inertia (such as commercial cars), and has the advantages of good universality and applicability, stability, reliability and high safety.

The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, wherein like reference numerals are used to refer to like elements throughout. Therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (9)

1. The carbon ceramic brake disc comprises a disc-shaped disc body (10) and a cylindrical joint (20), wherein a mounting hole (11) is formed in the middle of the disc body (10), the inner end of the joint (20) is inserted into the mounting hole (11) of the disc body (10), and a connecting part (21) used for being connected with a vehicle hub is arranged at the outer end of the joint (20);

the mounting structure is characterized in that a first limit structure (12) is circumferentially arranged on the hole wall of the mounting hole (11), and a second limit structure (22) is circumferentially arranged on the outer circumferential surface of the inner end of the closing head (20); the first limiting structure (12) is matched and connected with the second limiting structure (22) to form a circumferential limiting structure which is used for limiting the relative rotation of the tray body (10) and the joint (20).

2. A carbon ceramic brake disc according to claim 1, wherein the first limiting structure (12) is a plurality of spline grooves (121) formed in the wall of the mounting hole (11); the second limiting structure (22) is a plurality of spline teeth (221) arranged on the outer peripheral surface of the inner end of the closing head (20); the spline teeth (221) are embedded in the spline grooves (121).

3. A carbon ceramic brake disc according to claim 2, wherein an annular spline groove ring (13) is arranged in the mounting hole (11), the spline groove ring (13) and the disc body (10) are integrally formed, and the spline groove (121) is formed on the inner wall of the spline groove ring (13); the number of spline grooves (121) is the same as that of spline teeth (221), and at least twenty spline grooves (121) are distributed at equal intervals along the circumferential direction of the spline groove ring (13), and the spline grooves (121) and the spline teeth (221) are arranged in a one-to-one correspondence mode.

4. A carbon ceramic brake disc according to claim 1, 2 or 3, characterized in that the disc body (10) is made of carbon ceramic material and the closing head (20) is made of aluminium alloy or gray cast iron.

5. A carbon ceramic brake disc according to claim 3, wherein an annular gasket (30) or an arc-shaped gasket is arranged at the inner end face of the closing head (20), the annular gasket (30) and the arc-shaped gasket are fixedly connected with the end parts of spline teeth (221) of the closing head (20) through fasteners (40), or the annular gasket (30) and the arc-shaped gasket are fixedly connected with the end faces of spline grooves (13) of the disc body (10) through fasteners (40), or the annular gasket (30) and the arc-shaped gasket are simultaneously fixedly connected with the end parts of the spline teeth (221) of the closing head (20) and the end faces of the spline grooves (13) of the disc body (10) through fasteners (40).

6. A carbon ceramic brake disc according to claim 5, characterized in that the spline grooves (13) have a width smaller than the thickness of the disc body (10), and that first stepped grooves (14) are formed between the two sides of the spline grooves (13) and the wall of the mounting hole (11); the length of the spline teeth (221) is smaller than that of the spline grooves (121), and a second step groove (15) is formed between the end surface of the spline teeth (221) and the side surface of the spline groove ring (13); the annular gasket (30) and the arc-shaped gasket are embedded in the first step groove (14) or the second step groove (15).

7. A carbon ceramic brake disc according to claim 1, 2 or 3, wherein the connecting portion (21) comprises a plurality of convex corners (211) arranged on the outer peripheral surface of the outer end of the joint (20), the convex corners (211) are uniformly distributed at intervals along the circumferential direction of the outer end of the joint (20), and each convex corner (211) is provided with a connecting hole (212) penetrating through two sides of the convex corner (211).

8. A carbon ceramic brake disc according to claim 1, 2 or 3, wherein a plurality of ventilation through grooves extending from the wall of the mounting hole (11) to the outer peripheral surface of the disc body (10) are formed in the disc body (10), or heat dissipation through holes penetrating through two sides of the disc body (10) are formed in the disc body (10).

9. A carbon ceramic brake disc according to claim 1, wherein the first limiting structure (12) is a plurality of spline teeth arranged on the wall of the mounting hole (11); the second limiting structure (22) is a plurality of spline grooves arranged on the outer peripheral surface of the inner end of the closing head (20); the spline teeth are embedded in the spline grooves.