CN217713416U - Brake disc assembly - Google Patents

Abstract

The utility model relates to a vehicle braking technical field, concretely relates to brake disc assembly. The brake disc assembly includes: the tray body is provided with a sink groove along one axial end; one end of the joint along the axial direction is suitable for being connected with the shaft head and/or the shaft surface, the other end of the joint is convexly provided with a torque bearing part, and the torque bearing part is suitable for being matched with the sinking groove to bear and/or transmit braking torque; and one end of the connecting piece along the axial direction is connected with the torsion bearing part, and the other end of the connecting piece is connected with the disc body. The utility model provides a brake disc subassembly holds the portion of turning round through the setting and replaces traditional bolt/jogged joint for it has bigger load area to close between head and the disk body, thereby strengthens the mechanical properties of brake disc subassembly has avoided producing too big stress concentration, is favorable to transmitting the braking moment of torsion better, has strengthened the security of brake disc subassembly.

Description

Brake disc assembly

Technical Field

The utility model relates to a vehicle braking technical field, concretely relates to brake disc assembly.

Background

Most of brake discs adopted by the conventional commercial vehicle are made of gray cast iron, and when the brake disc is kept at a high temperature for a long time in high-temperature braking, particularly in a long-downhill working condition, the cast iron disc generates a heat fading phenomenon, the braking friction coefficient is reduced, the braking performance is reduced, and potential safety hazards exist.

In order to improve the friction performance, especially the braking performance of a brake disc under a high-temperature working condition, in a high-performance passenger car (especially, a racing car), a carbon ceramic brake disc is widely used, which has more excellent heat resistance and frictional heat stability than a conventional cast iron brake disc, and the carbon ceramic disc has a density much lower than that of cast iron, so that the weight reduction of the brake disc can be remarkably improved.

Although the carbon ceramic disc has excellent friction performance, compared with a cast iron material, the carbon ceramic disc has lower material strength, and on certain heavy-duty and large-inertia (such as commercial vehicles) vehicles, the existing carbon ceramic brake disc structure is easy to generate overlarge stress concentration, so that the requirement on safety performance cannot be met.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the present invention lies in overcoming the defect that the brake disc structure easily generates the excessive stress concentration in the prior art, thereby providing a brake disc assembly capable of avoiding generating the excessive stress concentration.

In order to solve the technical problem, the utility model provides a brake disc assembly, include:

the tray body is provided with a sink groove along one axial end;

one end of the joint along the axial direction is suitable for being connected with the shaft head and/or the shaft surface, the other end of the joint is convexly provided with a torque bearing part, and the torque bearing part is suitable for being matched with the sinking groove to bear and/or transmit braking torque;

and one end of the connecting piece in the axial direction is connected with the torsion bearing part, and the other end of the connecting piece is connected with the disc body.

Optionally, the sinking grooves are uniformly distributed around the circumferential direction of the disc body; the torque bearing parts are uniformly distributed around the circumferential direction of the joint; the sinking grooves are arranged in one-to-one correspondence with the torque bearing parts.

Optionally, the torque receiving portion and the sinking groove are in interference fit and/or transition fit.

Optionally, a through hole is axially formed in the bottom wall of the sinking groove, and the through hole is suitable for being in clearance fit with the connecting piece.

Optionally, the torsion-bearing portion includes a first bearing surface, and the first bearing surface is disposed on the outer peripheral wall of the torsion-bearing portion;

the sinking groove comprises a second bearing surface, and the second bearing surface is arranged on the inner peripheral wall of the sinking groove;

the second bearing surface is matched with the first bearing surface in a one-to-one correspondence manner and is suitable for bearing and/or transmitting braking torque.

Optionally, the torque receiving portion further includes a first abutting surface, and the first abutting surface is disposed at one axial end of the torque receiving portion;

the sinking groove also comprises a second abutting surface which is arranged on the bottom wall of the sinking groove;

the first abutting surfaces and the second abutting surfaces are abutted in a one-to-one corresponding mode.

Optionally, the first abutting surface is provided with a screw hole along the axial direction; one end of the connecting piece in the axial direction is at least partially provided with a first thread; the first thread is adapted to mate with the threaded hole.

Optionally, the brake disc assembly further comprises a nut; the other end of the connecting piece along the axial direction is at least partially provided with a second thread; the second thread is adapted to mate with the nut.

Optionally, the disk body is radially provided with ventilation grooves, and the ventilation grooves penetrate through the inner and outer peripheral walls of the disk body.

Optionally, the tray body is provided with a vent hole along the axial direction, and the vent hole penetrates through the upper end wall and the lower end wall of the tray body; at least part of the vent holes are arranged through the vent groove.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a brake disc assembly, include: the tray body is provided with a sink groove along one axial end; one end of the joint along the axial direction is suitable for being connected with the shaft head and/or the shaft surface, the other end of the joint is convexly provided with a torque bearing part, and the torque bearing part is suitable for being matched with the sinking groove so as to bear and/or transmit braking torque; one end of the connecting piece along the axial direction is connected with the torsion bearing part, and the other end of the connecting piece is connected with the disc body; the torsion bearing part is arranged to replace the traditional bolt/hole connection, so that a larger bearing area is reserved between the combining head and the disc body, the mechanical property of the brake disc assembly is enhanced, excessive stress concentration is avoided, the brake torque is favorably transmitted, and the safety of the brake disc assembly is enhanced.

2. The brake disc assembly provided by the utility model, the number of the sinking grooves is multiple groups, and the multiple groups of the sinking grooves are evenly distributed around the circumferential direction of the disc body; the number of the torque bearing parts is multiple, and the multiple sets of torque bearing parts are uniformly distributed around the circumferential direction of the joint; the sinking grooves and the torsion bearing parts are arranged in a one-to-one correspondence mode, so that the whole bearing area is increased, the whole stress is more uniform, the generation of overlarge stress concentration is avoided, the mechanical property of the brake disc assembly is further enhanced, and the reliability of the brake disc assembly is improved.

3. The utility model provides a brake disc assembly, through interference fit and/or transition fit between the torsion portion and the sink groove, thereby guarantee that the torsion portion and the sink groove are always in a surface contact state, effectively avoid local overlarge stress concentration, and enhance the torsion resistance of the brake disc assembly; the connecting piece and the through hole are in clearance fit, so that in the braking process, the braking torque is mainly borne by the torsion bearing part, the connecting piece is prevented from bearing shearing force, and the durability and reliability of the whole brake disc assembly and all parts are enhanced.

4. The utility model provides a brake disc assembly, the torsion part comprises a first bearing surface, and the first bearing surface is arranged on the peripheral wall of the torsion part; the sinking groove comprises a second bearing surface, and the second bearing surface is arranged on the inner peripheral wall of the sinking groove; the second bearing surfaces are matched with the first bearing surfaces in a one-to-one corresponding manner; the number of the first bearing surfaces is two; in the braking process, any one of the two groups of first bearing surfaces is a main stressed part of the torque bearing part for bearing braking torque; the first bearing surface and the second bearing surface are in surface contact, so that overlarge stress concentration caused by local point contact and/or line contact is avoided, and the reliability of the brake disc assembly is enhanced.

5. The utility model provides a brake disc component, the torque bearing part and the closing head are integrally formed; the first threads are matched with the screw holes, so that the connecting piece and the torque bearing part can be detachably and fixedly connected; the torsion bearing part is matched with the sinking groove, so that the bearing area between the torsion bearing part and the tray body is increased, and the detachable fixed connection between the torsion bearing part and the tray body is realized; the second threads are matched with the nuts, so that the detachable fixed connection between the connecting piece and the tray body is realized; and furthermore, the brake disc assembly is convenient to disassemble, assemble and maintain, repair and replace local parts while the torsion resistance is enhanced, and the cost is saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an exploded structure of a brake disc assembly according to the present invention;

FIG. 2 is a schematic cross-sectional structural view of the brake disc assembly of the present invention;

FIG. 3 is a schematic view of the overall structure of the brake disc assembly of the present invention;

FIG. 4 is a schematic side view of the brake disc assembly of the present invention;

FIG. 5 is a schematic bottom view of the brake disc assembly of the present invention;

FIG. 6 is a schematic view of the whole structure of the brake disc assembly after the disc body is hidden;

fig. 7 is a schematic view of the whole structure of the clutch head of the brake disc assembly of the present invention;

fig. 8 is a schematic bottom view of the clutch head of the brake disc assembly of the present invention;

fig. 9 is a schematic view of the overall structure of the disc body of the brake disc assembly of the present invention;

FIG. 10 is a schematic cross-sectional view of the disc body of the brake disc assembly of the present invention;

fig. 11 is a schematic view of the overall structure of the connecting member of the brake disc assembly according to the present invention.

Description of reference numerals:

1. closing the head; 10. a torque receiving part; 101. a first bearing surface; 102. a first abutting surface; 11. a screw hole;

2. a tray body; 20. sinking a groove; 201. a second force bearing surface; 202. a second abutting surface; 203. a through hole; 21. a ventilation slot; 22. a vent hole;

3. a connecting member; 31. a first thread; 32. a second thread; 33. a guide portion;

4. and a nut.

Detailed Description

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 to 11, the present embodiment provides a brake disc assembly including:

the disc body 2, one end of the disc body 2 along the axial direction is provided with a sinking groove 20;

one end of the coupling head 1 along the axial direction is suitable for being connected with a shaft head and/or a shaft surface, the other end of the coupling head 1 is convexly provided with a torque bearing part 10, and the torque bearing part 10 is suitable for being matched with the sinking groove 20 to bear and/or transmit braking torque;

and one end of the connecting piece 3 along the axial direction is connected with the torsion part 10, and the other end of the connecting piece 3 is connected with the disc body 2.

It should be noted that the central axis refers to an axis L in fig. 3, and the axis L is a rotation central axis of the joint 1 and/or the disc body 2; the axial direction refers to the direction of the central axis; the radial direction refers to any direction perpendicular to the central axis; the circumferential direction refers to a circumferential direction of the central shaft; the number of the sinking grooves 20 and the distribution of the sinking grooves on the tray body 2 can be adjusted according to the actual use condition, and are not limited to the conditions described in the embodiment; the cross-sectional shape of the torque receiving part 10 in the vertical axial direction includes, but is not limited to, approximately rectangular, approximately trapezoidal, or approximately fan-shaped, and can be adjusted according to the actual use condition, and is not limited to the condition described in the embodiment; the number of the torque-bearing parts 10 and the distribution of the torque-bearing parts on the joint 1 can be adjusted according to the actual use condition, and are not limited to the conditions described in the embodiment; the joint 1 is fixedly connected with the torsion part 10, the joint 1 and the torsion part 10 can be integrally formed, the joint 1 and the torsion part 10 can also be connected by welding, and the joint can be adjusted according to actual use conditions, and is not limited to the conditions described in the embodiment.

Optionally, the sinking groove 20 is axially arranged on one side of the disc body 2, and the sinking groove 20 is adapted to be matched with the torque receiving portion 10; through setting up heavy groove 20, not only increased the bearing area of disk body 2, avoided producing too big stress concentration, can make when the assembly moreover hold the portion of twisting 10 and sink into disk body 2 in, reduced the space and occupy, can provide more spaces for other opponents.

Optionally, one end of the coupling head 1 along the axial direction is convexly provided with a torque bearing part 10, and the other end is connected with the shaft head and/or the shaft surface through bolts.

Optionally, the joint 1 and the torque receiving portion 10 are integrally formed.

Optionally, the disc body 2 is a carbon ceramic disc, which has better heat resistance and frictional heat stability than a conventional cast iron brake disc, and the density of the carbon ceramic disc is much lower than that of cast iron, so that the weight of the brake disc can be remarkably reduced.

Optionally, the torque receiving portion 10 extends axially from one end of the joint 1, and at least a part of the outer peripheral wall of the torque receiving portion 10 is protruded, so as to increase the force bearing area of the torque receiving portion 10, thereby enhancing the torsion resistance of the torque receiving portion 10.

Optionally, one end of the connecting element 3 along the axial direction is detachably and fixedly connected with the torque receiving portion 10, and the other end is detachably and fixedly connected with the disc body 2.

In this embodiment, the brake disc assembly includes: the disc body 2 is provided with a sink groove 20 at one axial end of the disc body 2; one end of the coupling head 1 along the axial direction is suitable for being connected with a shaft head and/or a shaft surface, the other end of the coupling head 1 is convexly provided with a torque bearing part 10, and the torque bearing part 10 is suitable for being matched with the sinking groove 20 to bear and/or transmit braking torque; one end of the connecting piece 3 along the axial direction is connected with the torsion part 10, and the other end of the connecting piece 3 is connected with the disc body 2; the traditional bolt/hole connection is replaced by the torsion bearing part 10, so that a larger bearing area is reserved between the combining head 1 and the disc body 2, the mechanical property of the brake disc assembly is enhanced, excessive stress concentration is avoided, the brake torque is favorably transmitted, and the safety of the brake disc assembly is enhanced.

Specifically, the sinking grooves 20 are uniformly distributed around the circumferential direction of the disc body 2; the torque bearing parts 10 are uniformly distributed around the circumferential direction of the joint 1; the sinking grooves 20 are arranged corresponding to the torque receiving parts 10 one by one.

Optionally, the number of the sinking grooves 20 is ten, and ten groups of the sinking grooves 20 are uniformly distributed around the circumferential direction of the disc body 2; the number of the torque-bearing parts 10 is ten, and ten groups of the torque-bearing parts 10 are uniformly distributed around the circumferential direction of the joint 1; the sunk grooves 20 are arranged in one-to-one correspondence with the torsion bearing parts 10, so that the whole bearing area is increased, and the whole stress is more uniform.

In this embodiment, the number of the sinking grooves 20 is multiple, and the multiple groups of the sinking grooves 20 are uniformly distributed around the circumferential direction of the tray body 2; the number of the torque-bearing parts 10 is multiple, and the multiple sets of torque-bearing parts 10 are uniformly distributed around the circumferential direction of the joint 1; the sunk grooves 20 are arranged in one-to-one correspondence with the torsion bearing parts 10, so that the whole bearing area is increased, the whole stress is more uniform, the generation of overlarge stress concentration is avoided, the mechanical property of the brake disc assembly is further enhanced, and the reliability of the brake disc assembly is improved.

Specifically, the torque receiving portion 10 and the sinking groove 20 are in interference fit and/or transition fit.

Optionally, the torsion-bearing part 10 and the sinking groove 20 are in interference fit and/or transition fit, so that the torsion-bearing part 10 and the sinking groove 20 are always in a surface contact state, local overlarge stress concentration is effectively avoided, and the torsion resistance of the brake disc assembly is enhanced.

Specifically, the bottom wall of the sinking groove 20 is provided with a through hole 203 along the axial direction, and the through hole 203 is suitable for being in clearance fit with the connecting piece 3.

Optionally, the connecting member 3 and the through hole 203 are in clearance fit, so that in the braking process, the braking torque is mainly borne by the torsion bearing part 10, and the connecting member 3 is prevented from bearing the shearing force.

In this embodiment, the torque receiving portion 10 and the sinking groove 20 are in interference fit and/or transition fit, so that the torque receiving portion 10 and the sinking groove 20 are always in a surface contact state, local excessive stress concentration is effectively avoided, and the torsion resistance of the brake disc assembly is enhanced; the connecting piece 3 is in clearance fit with the through hole 203, so that in the braking process, the braking torque is mainly borne by the torsion bearing part 10, the connecting piece 3 is prevented from bearing shearing force, and the durability and reliability of the whole brake disc assembly and all parts are enhanced.

Specifically, the torsion bearing portion 10 includes a first force-bearing surface 101, and the first force-bearing surface 101 is disposed on the outer peripheral wall of the torsion bearing portion 10;

the sinking groove 20 comprises a second bearing surface 201, and the second bearing surface 201 is arranged on the inner peripheral wall of the sinking groove 20;

the second bearing surfaces 201 are matched with the first bearing surfaces 101 in a one-to-one correspondence mode and are suitable for bearing and/or transmitting braking torque.

Optionally, the number of the first force bearing surfaces 101 is two, and the two groups of the first force bearing surfaces 101 are symmetrically arranged on the outer peripheral wall of the torsion bearing part 10; in the braking process, any one of the two groups of first bearing surfaces 101 is a main stressed part of the torque bearing part 10 for bearing braking torque.

Optionally, the number of the second force bearing surfaces 201 is two, and the two groups of the second force bearing surfaces 201 are symmetrically arranged on the inner peripheral wall of the sinking groove 20; during braking, any one of the two sets of the second bearing surfaces 201 is a main stressed part of the sinking groove 20 bearing braking torque.

Optionally, the first bearing surface 101 and the second bearing surface 201 are in surface contact, so that excessive stress concentration caused by local point contact and/or line contact is avoided.

In this embodiment, the torsion-bearing portion 10 includes a first bearing surface 101, and the first bearing surface 101 is disposed on an outer peripheral wall of the torsion-bearing portion 10; the sinking groove 20 comprises a second bearing surface 201, and the second bearing surface 201 is arranged on the inner peripheral wall of the sinking groove 20; the second bearing surfaces 201 are matched with the first bearing surfaces 101 in a one-to-one corresponding manner; the number of the first bearing surfaces 101 is two; in the braking process, any one of the two groups of first bearing surfaces 101 is a main stressed part of the torque bearing part 10 for bearing braking torque; the first bearing surface 101 and the second bearing surface 201 are in surface contact, so that overlarge stress concentration caused by local point contact and/or line contact is avoided, and the reliability of the brake disc assembly is enhanced.

Specifically, the torque receiving portion 10 further includes a first abutting surface 102, and the first abutting surface 102 is disposed at one axial end of the torque receiving portion 10;

the sinking groove 20 further comprises a second abutting surface 202, and the second abutting surface 202 is arranged on the bottom wall of the sinking groove 20;

the first abutting surface 102 and the second abutting surface 202 are abutted in a one-to-one correspondence.

Optionally, the first abutting surface 102 and the second abutting surface 202 are in surface contact, so that excessive stress concentration caused by local point contact and/or line contact is avoided, and the reliability of the brake disc assembly is enhanced.

Specifically, the first abutting surface 102 is provided with a screw hole 11 along the axial direction; the connecting piece 3 is at least partially provided with a first thread 31 at one axial end; said first thread 31 is adapted to cooperate with said threaded hole 11.

Optionally, the first thread 31 is arranged to cooperate with the screw hole 11, so as to realize the detachable and fixed connection between the connecting piece 3 and the torque receiving portion 10.

In particular, the brake disc assembly further comprises a nut 4; the other end of the connecting piece 3 along the axial direction is at least partially provided with a second thread 32; the second thread 32 is adapted to cooperate with the nut 4.

Optionally, the second thread 32 is provided to cooperate with the nut 4, so as to realize the detachable fixed connection between the connecting element 3 and the disc body 2.

Optionally, the connecting piece 3 is further provided with a guiding portion 33, and the guiding portion 33 is arranged between the first thread 31 and the second thread 32; the guide part 33 comprises 2N groups of clamping surfaces, wherein N is a positive integer; the 2N groups of clamping surfaces are symmetrically arranged so as to facilitate clamping of the guide part 33 by a caliper and/or a wrench in an assembling process, and therefore screwing and fixing of the connecting piece 3 are realized.

In this embodiment, the torsion-bearing part 10 and the joint 1 are integrally formed; the first thread 31 is matched with the screw hole 11, so that the detachable fixed connection between the connecting piece 3 and the torque bearing part 10 is realized; the torsion bearing part 10 is matched with the sinking groove 20, so that the bearing area between the torsion bearing part 10 and the disc body 2 is increased, and the detachable fixed connection between the torsion bearing part 10 and the disc body 2 is realized; the second thread 32 is matched with the nut 4, so that the detachable fixed connection between the connecting piece 3 and the disc body 2 is realized; and then make the brake disc subassembly is convenient for dismouting maintenance and local part's maintenance and change when strengthening the resistance to torsion performance, is favorable to practicing thrift the cost.

Specifically, the tray body 2 is provided with ventilation slots 21 along the radial direction, and the ventilation slots 21 penetrate through the inner and outer peripheral walls of the tray body 2.

Optionally, the quantity of ventilation groove 21 is the multiunit, multiunit ventilation groove 21 encircles 2 evenly distributed of disk body to reinforcing disk body 2's heat dispersion is favorable to in time distributing away the heat that the friction produced in braking process.

Specifically, the tray body 2 is provided with a vent hole 22 along the axial direction, and the vent hole 22 penetrates through the upper end wall and the lower end wall of the tray body 2; at least a part of the ventilation holes 22 is provided through the ventilation slot 21.

Optionally, the number of the ventilation holes 22 is multiple groups, and the multiple groups of ventilation holes 22 surround the disc body 2, so that the heat dissipation performance of the disc body 2 is enhanced, heat generated by friction in the braking process is favorably dissipated in time, and the braking performance of the brake disc assembly is ensured.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A brake disc assembly, comprising:

the disc body (2), one end of the disc body (2) along the axial direction is provided with a sink groove (20);

the clutch head (1), one end of the clutch head (1) along the axial direction is suitable for being connected with a shaft head and/or a shaft surface, the other end of the clutch head is convexly provided with a torque bearing part (10), and the torque bearing part (10) is suitable for being matched with the sinking groove (20) to bear and/or transmit braking torque;

the connecting piece (3), connecting piece (3) along axial one end with hold the portion of turning round (10) and be connected, the other end with disk body (2) are connected.

2. Brake disc assembly according to claim 1, characterized in that the sinkers (20) are circumferentially evenly distributed around the disc body (2); the torque bearing parts (10) are uniformly distributed around the circumferential direction of the joint (1); the sunk grooves (20) are arranged in one-to-one correspondence with the torque bearing parts (10).

3. Brake disc assembly according to claim 2, characterized in that the torque receiving portion (10) and the counter sink (20) are in an interference and/or transition fit.

4. A brake disc assembly according to claim 3, wherein the bottom wall of the sink (20) is axially provided with a through hole (203), and the through hole (203) is adapted to be in clearance fit with the connecting element (3).

5. A brake disc assembly according to claim 3,

the torsion part (10) comprises a first bearing surface (101), and the first bearing surface (101) is arranged on the outer peripheral wall of the torsion part (10);

the sinking groove (20) comprises a second bearing surface (201), and the second bearing surface (201) is arranged on the inner peripheral wall of the sinking groove (20);

the second bearing surfaces (201) are matched with the first bearing surfaces (101) in a one-to-one correspondence mode and are suitable for bearing and/or transmitting braking torque.

6. A brake disc assembly according to claim 3,

the torsion-bearing part (10) further comprises a first abutting surface (102), and the first abutting surface (102) is arranged at one axial end of the torsion-bearing part (10);

the sinking groove (20) further comprises a second abutting surface (202), and the second abutting surface (202) is arranged on the bottom wall of the sinking groove (20);

the first abutting surface (102) and the second abutting surface (202) are abutted in a one-to-one correspondence mode.

7. The brake disc assembly according to claim 6, characterized in that the first abutment surface (102) is axially provided with a threaded hole (11); the connecting piece (3) is at least partially provided with a first thread (31) along one axial end; the first thread (31) is adapted to cooperate with the threaded hole (11).

8. A brake disc assembly according to claim 7, further comprising a nut (4); the other end of the connecting piece (3) along the axial direction is at least partially provided with a second thread (32); the second thread (32) is adapted to cooperate with the nut (4).

9. A brake disc assembly according to any one of claims 1 to 8, characterised in that the disc body (2) is provided with radially extending ventilation slots (21), the ventilation slots (21) being provided through the outer and inner peripheral walls of the disc body (2).

10. A brake disc assembly according to any one of claims 1 to 8, characterised in that the disc body (2) is axially provided with ventilation holes (22), the ventilation holes (22) being provided through the upper and lower end walls of the disc body (2); at least part of the ventilation holes (22) are arranged through the ventilation groove (21).

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