CN111594557B

CN111594557B - Split type brake disc

Info

Publication number: CN111594557B
Application number: CN202010489695.XA
Authority: CN
Inventors: 方明刚; 金文伟; 张宁; 杜利清; 张海锋
Original assignee: CRRC Qishuyan Institute Co Ltd; CRRC Changzhou Tech Mark Industrial Co Ltd
Current assignee: CRRC Qishuyan Institute Co Ltd; CRRC Changzhou Tech Mark Industrial Co Ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2022-07-01
Anticipated expiration: 2040-06-02
Also published as: CN111594557A

Abstract

The invention relates to a split brake disc, which comprises a first split disc body, a second split disc body and a first connecting piece used for connecting the first split disc body and the second split disc body, wherein the first split disc body is provided with a first split disc body connecting surface, the second split disc body is provided with a second split disc body connecting surface opposite to the first split disc body connecting surface, the first connecting piece is connected with the first split disc body and the second split disc body through a first connecting hole in the first split disc body connecting surface and a second connecting hole in the second split disc body connecting surface, and the split brake disc is characterized by further comprising a protection structure used for the first connecting piece, and the protection structure comprises a first protection part arranged on the first split disc body and a second protection part arranged on the second split disc body. The split type brake disc structure can effectively protect the first connecting piece and improve the reliability of fastening connection, and has the advantages of convenience in maintenance and replacement, reliability in fastening connection, high local heat capacity of the disc body, low casting defect and the like.

Description

Split type brake disc

Technical Field

The invention relates to a split type brake disc, in particular to a shaft-mounted split type brake disc for a rail transit train.

Background

The brake disc is used as an important component of a disc-shaped basic brake device, and the friction surface of the brake disc is clamped by the brake pad in the train braking process so as to realize train braking.

When the brake disc fails due to reasons such as thermal cracking overrun and the like in the use process, the failed brake disc needs to be replaced. If the mode that the whole bogie that falls, retreats the wheel, moves back the dish and then change integral brake disc is adopted, cause the unable normal operating of vehicle, and change the maintenance cost higher, therefore it is necessary to develop the split type brake disc that satisfies vehicle connection and thermal capacity requirement to realize the direct change to the brake disc that loses efficacy. In the braking process of a vehicle, the brake disc connecting piece bears the braking torque transmitted by the brake pad through the disc surface, so that the requirements on the fastening performance and the reliability of the brake disc connecting piece are high. Meanwhile, due to the action of the brake pads in the braking process, the disc body expands radially outwards under the influence of heat load.

Therefore, in the design of the split brake disc, the braking torque transmission should be comprehensively considered to realize the protection of the connecting piece, and simultaneously, the radial thermal deformation of the disc body is released, so that the stress level of the connecting structure is reduced, and the application reliability of the brake disc is comprehensively improved.

Disclosure of Invention

The invention mainly aims to provide a split type brake disc to solve the problems in the prior art.

In order to achieve the above object, according to one aspect of the present invention, a split brake disc is provided, including a first split disc body and a second split disc body, and a first connecting member for connecting the first split disc body and the second split disc body, wherein the first split disc body has a first split disc body connecting surface, the second split disc body has a second split disc body connecting surface opposite to the first split disc body connecting surface, the first connecting member connects the first split disc body and the second split disc body via a first connecting hole on the first split disc body connecting surface and a second connecting hole on the second split disc body connecting surface, the split brake disc further includes a protection structure for the first connecting member, the protection structure includes a first protection portion provided on the first split disc body and a second protection portion provided on the second split disc body, and the first protection portion and the second protection portion cooperate to receive a force or a torque generated by the first split disc body and the second split disc body to reduce or reduce the torque Avoiding the transmission of said force or torque to said first connection member.

Further, the first protection portion is formed on the first sub tray body connection surface, and the second protection portion is formed on the second sub tray body connection surface.

Furthermore, the first protection portion and the second protection portion act together to receive the circumferential acting force transmitted by the first sub disc body and the second sub disc body in a normal braking process, a circumferential separation trend or circumferential separation, and the circumferential acting force is reduced or prevented from being transmitted to the first connecting piece.

Furthermore, the first protection portion and the second protection portion act together to bear the radial acting force transmitted by the first sub disc body and the second sub disc body in a normal braking process, a circumferential separation trend or circumferential separation, and the radial acting force is reduced or prevented from being transmitted to the first connecting piece.

Furthermore, the first protection part is at least one convex key protruding out of the connecting surface of the first sub tray body, and the second protection part is at least one groove recessed in the connecting surface of the second sub tray body.

Furthermore, the convex key comprises a first positioning surface and a first force transmission surface, the groove comprises a second positioning surface and a second force transmission surface, the first positioning surface and the second positioning surface have the function of positioning the first split disk and the second split disk, and the first force transmission surface and the second force transmission surface have the function of bearing the force or the torque generated by the first split disk and the second split disk.

Further, the first connecting piece penetrates through the convex key and/or the groove.

Further, the key and/or the groove are arranged on one side of the first connecting piece in the radial direction or the axial direction of the brake disc.

Further, the convex key comprises a first convex key part and a second convex key part, and the groove comprises a first groove part and a second groove part, wherein the first convex key part and the second convex key part are positioned on the connecting surface of the first sub tray body, and the first groove part and the second groove part are positioned on the connecting surface of the second sub tray body; or the first convex key part and the first groove part are positioned on the first sub tray body connecting surface, and the second convex key part and the second groove part are positioned on the second sub tray body connecting surface.

Furthermore, the convex key penetrates through the connecting surface of the first sub-disc body and/or the connecting surface of the second sub-disc body along the axial direction of the brake disc, and the groove is matched with the convex key.

Furthermore, the convex key protrudes out of the first sub disc body connecting surface and/or the second sub disc body connecting surface in the circumferential direction of the brake disc and partially covers the first sub disc body connecting surface and/or the second sub disc body connecting surface in the axial direction and/or the radial direction of the brake disc, and the groove is matched with the convex key.

Furthermore, the first positioning surface and the second positioning surface are planes parallel to the connection surface of the first sub-tray body and the connection surface of the second sub-tray body, an included angle between a characteristic normal vector of the first positioning surface and a characteristic normal vector of the first power transmission surface is smaller than 90 degrees, and an included angle between a characteristic normal vector of the second positioning surface and a characteristic normal vector of the second power transmission surface is smaller than 90 degrees; the feature normal vectors of the first positioning surface, the first force transmission surface, the second positioning surface and the second force transmission surface are respectively as follows: the first positioning surface points to the normal vector inside the convex key, the first force transmission surface or a certain tangent plane of the first force transmission surface points to the normal vector inside the convex key, the second positioning surface points to the normal vector inside the groove, and the second force transmission surface or a certain tangent plane of the second force transmission surface points to the normal vector inside the groove.

Furthermore, the groove is a trapezoid groove, the first connecting piece penetrates through the groove, the groove penetrates through the second sub-disc body connecting surface in the axial direction of the brake disc, the width of the bottom of the groove in the radial direction of the brake disc is smaller than the width of the top of the groove in the radial direction of the brake disc, and the convex key is matched with the groove.

Furthermore, the groove comprises a first groove part and a second groove part which are in a trapezoid groove shape and are positioned on the second sub disc body connecting surface and arranged on two side surfaces of the first connecting piece, the first groove part and the second groove part penetrate through the second sub disc body connecting surface in the axial direction of the brake disc, the width of the bottom of the first groove part and the second groove part in the radial direction of the brake disc is smaller than that of the top of the first groove part and the second groove part in the radial direction of the brake disc, and the convex key comprises a first convex key part and a second convex key part which are positioned on the first sub disc body connecting surface and are matched with the first groove part and the second groove part.

Furthermore, the first positioning surface and the second positioning surface are planes parallel to the connection surface of the first sub-tray body and the connection surface of the second sub-tray body, an included angle between a characteristic normal vector of the first positioning surface and a characteristic normal vector of the first power transmission surface is greater than 90 degrees, and an included angle between a characteristic normal vector of the second positioning surface and a characteristic normal vector of the second power transmission surface is greater than 90 degrees; the feature normal vectors of the first positioning surface, the first force transmission surface, the second positioning surface and the second force transmission surface are respectively as follows: the first positioning surface points to the normal vector inside the convex key, the first force transmission surface or a certain tangent plane of the first force transmission surface points to the normal vector inside the convex key, the second positioning surface points to the normal vector inside the groove, and the second force transmission surface or a certain tangent plane of the second force transmission surface points to the normal vector inside the groove.

Furthermore, the groove is a dovetail groove type, the first connecting piece penetrates through the groove, the groove penetrates through the second sub-disc body connecting surface in the axial direction of the brake disc, the width of the bottom of the groove in the radial direction of the brake disc is larger than the width of the top of the groove in the radial direction of the brake disc, and the convex key is matched with the groove.

Furthermore, first locating surface and second locating surface be with first branch disk body is connected the face with the second divides the disk body to connect the parallel plane of face, first locating surface with first power transmission face or certain tangent plane of first power transmission face is parallel, the second locating surface with the second passes power transmission face or certain tangent plane of second power transmission face is parallel.

Furthermore, the groove is of an inverted groove type, the first connecting piece penetrates through the groove, the groove penetrates through the connecting surface of the second split disc body in the axial direction of the brake disc, the width of the bottom of the groove in the radial direction of the brake disc is larger than that of the top of the groove in the radial direction of the brake disc, and the convex key is matched with the groove.

Furthermore, the first positioning surface and the second positioning surface are planes parallel to the connection surface of the first split plate body and the connection surface of the second split plate body, an included angle between a characteristic normal vector of the first positioning surface and a characteristic normal vector of the first power transmission surface is equal to 90 degrees, and an included angle between a characteristic normal vector of the second positioning surface and a characteristic normal vector of the second power transmission surface is equal to 90 degrees; the feature normal vectors of the first positioning surface, the first force transmission surface, the second positioning surface and the second force transmission surface are respectively as follows: the first positioning surface points to the normal vector inside the convex key, the first force transmission surface or a certain tangent plane of the first force transmission surface points to the normal vector inside the convex key, the second positioning surface points to the normal vector inside the groove, and the second force transmission surface or a certain tangent plane of the second force transmission surface points to the normal vector inside the groove.

Furthermore, the convex key is a cylindrical boss, the first connecting piece penetrates through the convex key, and the groove is matched with the convex key.

Furthermore, the convex key is a rectangular boss, the first connecting piece penetrates through the convex key, the convex key penetrates through the connecting surface of the first split disc body in the axial direction of the brake disc, and the groove is matched with the convex key.

Furthermore, the convex key comprises a first convex key part and a second convex key part which are positioned on the connecting surface of the first sub disc body and are arranged on two side surfaces of the first connecting piece in the radial direction of the brake disc and are rectangular bulges, the first convex key part and the second convex key part penetrate through the connecting surface of the first sub disc body in the axial direction of the brake disc, and the groove comprises a first groove part and a second groove part which are positioned on the connecting surface of the second sub disc body and are matched with the first convex key part and the second convex key part.

Furthermore, the convex key is located on the connection surface of the first rotor body and the brake disc is radially and asymmetrically arranged on the rectangular boss on one side of the first connection member, the convex key penetrates through the connection surface of the first rotor body in the axial direction of the brake disc, and the groove is matched with the convex key.

Furthermore, the convex key is a rectangular boss arranged on one side of the first connecting piece in the axial direction of the brake disc, the convex key protrudes out of the connecting surface of the first sub disc body in the circumferential direction of the first sub disc body and partially covers the connecting surface of the first sub disc body in both the axial direction and the radial direction of the brake disc, and the groove is matched with the convex key.

Furthermore, the brake disc comprises four sub disc bodies, wherein the protection parts on the total four connection surfaces of two sub disc bodies are the convex keys, the protection parts on the total four connection surfaces of the other two sub disc bodies are the grooves, the convex keys are rectangular bosses arranged on one side of the connecting piece along the axial direction of the brake disc, the convex keys protrude out of the connection surfaces in the circumferential direction of the brake disc and partially cover the connection surfaces in the axial direction and the radial direction of the brake disc, and the grooves are matched with the convex keys.

Furthermore, the brake disc is composed of four sub disc bodies, wherein the protection parts on the two connection surfaces of each sub disc body are respectively the convex key and the groove, the convex key is a rectangular boss arranged on one side of the connection piece along the axial direction of the brake disc, the convex key protrudes out of the connection surface in the circumferential direction of the brake disc and partially covers the connection surface in the axial direction and the radial direction of the brake disc, and the groove is matched with the convex key.

Furthermore, the first positioning surface and the second positioning surface are planes which are obliquely arranged relative to the connecting surface of the first sub-tray body and the connecting surface of the second sub-tray body, and the inclination angle is 0-90 degrees.

Furthermore, at least one of the first positioning surface, the second positioning surface, the first force transmission surface and the second force transmission surface is a curved surface.

Furthermore, the first connecting piece and the first connecting hole and/or the second connecting hole, and the convex key and the groove are in clearance fit, and in the radial direction of the first connecting piece, the fit clearance between the first force transmission surface and the second force transmission surface is smaller than the fit clearance between the first connecting piece and the first connecting hole and/or between the first connecting piece and the second connecting hole.

Further, the first connecting piece, the first connecting hole and the second connecting hole are designed to ensure that the first connecting piece is not in contact with the side surface of the first connecting hole and/or the second connecting hole when the first sub-tray body is connected with the second sub-tray body in a positioning mode.

Further, first branch disk body and/or second divide the disk body to include two curved friction rings two the boss has between the friction ring, first branch disk body is connected the face and is divided the disk body with the second and be connected the face and be located the boss, first connecting hole and/or second connecting hole are seted up and are located the boss and be countersunk step hole.

Further, the convex key or the groove is protruded or recessed from the surface of the boss.

Furthermore, a plurality of disk body connecting claws are uniformly distributed on the inner ring of the friction ring in the circumferential direction.

Furthermore, the first connecting piece is a bolt and further comprises a nut for fixing the bolt.

Furthermore, the tail part of the bolt is provided with a cross-shaped vertically crossed cotter pin mounting hole, the nut is an outer hexagonal nut, and the middle part of each side edge of the head part of the nut is provided with a cotter pin mounting groove.

Furthermore, first branch disk body and/or second divide the disk body to include two curved friction rings, two have the boss between the friction ring, first branch disk body is connected the face and is connected the face with the second branch disk body and be located the boss, still include the spacer, the spacer is located the bolt head with between the boss, and/or the spacer is located the nut with between the boss.

Further, the installation directions of the bolts in the circumferential direction of the brake disc are the same.

Further, still including setting up the inside heat dissipation muscle of first branch disk body and/or second branch disk body, the heat dissipation muscle is including keeping away from the first heat dissipation muscle of first connecting hole and second connecting hole and neighbouring the second heat dissipation muscle of first connecting hole and second connecting hole, the second heat dissipation muscle is different with first heat dissipation muscle shape.

Furthermore, the first tray body and/or the second tray body comprise two arc-shaped friction rings, and the first heat dissipation ribs are connected to the two friction rings.

Furthermore, the second heat dissipation rib is designed to be variable in height, and forms a space for the first connecting piece to pass through.

Further, the space formed by the second heat dissipation ribs is an installation channel with a circular section.

Further, the diameter of the mounting channel is larger than the outer diameter of the mounting sleeve of the first connecting piece.

Further, the brake disc comprises more than 2, 3, 4, 5 or 6 sub-discs.

Furthermore, divide the disk body to be half disk body, the brake disc comprises 2 half disk body, first branch disk body connection face and second divide the disk body connection face to be located a median plane of brake disc.

Furthermore, the sub-disc body is a quarter disc body, the brake disc is composed of 4 quarter disc bodies, and the connection surface of the sub-disc body is positioned on two perpendicular middle sub-surfaces of the brake disc.

By applying the technical scheme of the invention, the following beneficial effects are achieved:

1. the designed convex key-groove structure of the sub-disc body ensures that the circumferential friction acting force generated by the brake pads to the disc body in the braking process of the vehicle under the normal use condition of the brake disc can be shared by the convex keys and the groove parts of the sub-disc body, thereby reducing the axial acting force to the connecting piece of the brake disc, reducing the working load of the connecting piece and forming effective protection to the connecting piece.

2. When the connection of the sub-disc body connecting piece is loose or fails to cause insufficient axial force of fastening connection or loose connection, so that the sub-disc body generates circumferential separation tendency or circumferential separation, circumferential friction acting force generated by the brake pad on the disc body can be shared or completely borne by the convex key and the groove part of the disc body, and thus the connecting piece is protected when the fastening connection is loose or fails.

3. The designed convex key-groove structure of the sub-disc body ensures that the radial expansion force can be borne by the convex key and the groove when the disc body bears the action of thermal load and generates radial outward expansion deformation in the braking process of a vehicle under the normal use condition of the brake disc, so that the connecting piece is prevented from directly bearing shearing force.

4. When the connecting piece of the sub-disc body has insufficient fastening friction force provided by fastening connection due to loose connection or connection failure or loose connection, the sub-disc body generates a radial movement trend or generates radial movement, the convex keys and the grooves of the sub-disc body are firstly attached, the connecting piece is not contacted with the side surfaces of the first connecting hole and the second connecting hole, the radial acting force can be borne by the convex key-groove structure, and the connecting piece is protected when the fastening connection is loose or failed.

5. The circumferential profile height-variable heat dissipation ribs are designed at the first connecting hole and the second connecting hole of the disc dividing body, and the size of the heat dissipation ribs ensures the space of a sleeve used by a connecting piece during the installation and the disassembly of the brake disc; the radiating ribs are additionally arranged on the inner side of the friction ring of the sub-disc body, so that the defect of local heat capacity caused by the design of the connecting piece is overcome, the temperature of the disc body at the connecting part of the connecting piece of the sub-disc body is reduced, and the connecting reliability is improved; the design of the heat dissipation ribs with the circumferential profile height is adopted, the feeding capacity of the casting process to the disc ring part is improved, and the improvement of the local inner part and the surface quality of the disc ring is facilitated technically.

6. The thread pair structure with the locking function is designed, the thread pair structure has reliable locking performance, and meanwhile, due to the design of the slotted locking nut and the split pin structure, loosening of the nut is effectively guaranteed, and reliability of bolt connection is guaranteed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 to 7 show a split brake disc according to embodiment 1 of the present invention, in which fig. 1-a schematic perspective view, fig. 2-a front view, fig. 3-a side view, fig. 4-a front view of one split disc body, fig. 5-a front view of another split disc body, fig. 6-a perspective view of one split disc body, fig. 7-a perspective view of another split disc body; and

fig. 8 to 12 show a split brake disc according to embodiment 2 of the present invention, in which fig. 8-a schematic perspective view, fig. 9-a front view, fig. 10-a side view, fig. 11-a front view of one split disc body, fig. 12-a front view of the other split disc body; and

fig. 13 to 17 show a split brake disc according to embodiment 3 of the present invention, in which fig. 13-a schematic perspective view, fig. 14-a front view, fig. 15-a side view, fig. 16-a front view of one split disc body, fig. 17-a front view of the other split disc body; and

fig. 18 to 22 show a split brake disc according to embodiment 4 of the invention, in which fig. 18-a perspective view, fig. 19-a front view, fig. 20-a side view, fig. 21-a front view of one split disc, fig. 22-a front view of the other split disc; and

fig. 23 to 27 show a split brake disc according to embodiment 5 of the present invention, in which fig. 23-a schematic perspective view, fig. 24-a front view, fig. 25-a side view, fig. 26-a front view of one split disc body, fig. 27-a front view of the other split disc body; and

fig. 28 to 32 show a split brake disc according to embodiment 6 of the invention, in which fig. 28-a perspective view, fig. 29-a front view, fig. 30-a side view, fig. 31-a front view of one split disc, fig. 32-a front view of the other split disc; and

fig. 33 to 37 show a split brake disc according to embodiment 7 of the present invention, in which fig. 33-a schematic perspective view, fig. 34-a front view, fig. 35-a side view, fig. 36-a front view of one split disc body, fig. 37-a front view of the other split disc body; and

fig. 38 to 44 show a split brake disc according to embodiment 8 of the present invention, in which fig. 38 is a schematic perspective view, fig. 39 is a front view, fig. 40 is a side view, fig. 41 is a front view of one split disc body, fig. 42 is a front view of another split disc body, fig. 43 is a perspective view of one split disc body, fig. 44 is a perspective view of another split disc body; and

fig. 45 to 51 show a split brake disc according to embodiment 9 of the invention, in which fig. 45-a schematic perspective view, fig. 46-a front view, fig. 47-a side view, fig. 48-a front view of one split disc body, fig. 49-a front view of another split disc body, fig. 50-a perspective view of one split disc body, fig. 51-a perspective view of another split disc body; and

fig. 52 to 57 show a split type brake disc according to embodiment 10 of the present invention, in which fig. 52-a front view, fig. 53-a side view, fig. 54-a front view of one split disc body, fig. 55-a front view of another split disc body, fig. 56-a perspective view of one split disc body, fig. 57-a perspective view of another split disc body; and

fig. 58 to 61 show a split type brake disc according to embodiment 11 of the present invention, in which fig. 58 is a front view, fig. 59 is a side view, fig. 60 is a front view of one split disc body, and fig. 61 is a perspective view of one split disc body.

Wherein the figures include the following reference numerals:

1-a first distributor body, 1-a first distributor body friction ring, and 1-2-a first distributor body first heat dissipation rib; 1-3-first split-disk body connecting claw; 1-4-a first distributor body boss; 1-5-a first connection hole; 1-6-convex key, 1-6-1-first positioning surface, 1-6-2-first force-transmitting surface; 1-7-dividing the middle surface of the first dividing plate body; 1-8-second heat dissipation ribs of the first tray body;

2-a second sub-disc body, 2-1-a friction ring of the second sub-disc body, and 2-a first heat dissipation rib of the second sub-disc body; 2-3-a second sub-tray body connecting claw; 2-4-boss of second sub-tray body; 2-5-second connection hole; 2-6-a groove, 2-6-1-a second positioning surface, and 2-6-2-a second force transmission surface; 2-7-splitting the middle split surface of the second split disc body; 2-8-second heat dissipation ribs of the second sub-tray body;

3, a bolt;

4, spacer bush;

5, a nut;

6-cotter pin.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The present invention is described in further detail below with reference to specific examples, which are not to be construed as limiting the scope of the invention as claimed.

Example 1

As shown in fig. 1 to 7, the split brake disc of the present invention has two split disc bodies, namely a first split disc body 1 and a second split disc body 2, and the first connecting member is a bolt 3, and further includes a spacer 4, a nut 5, and a cotter pin 6. Wherein, the first sub-tray body 1 and the second sub-tray body 2 are both half tray bodies, and the nut 5 is a slotted locking nut.

The first sub-tray body 1 consists of two semicircular first sub-tray body friction rings 1-1, first sub-tray body first heat dissipation ribs 1-2 for connecting the two friction rings 1-1, first sub-tray body second heat dissipation ribs 1-8 positioned on the inner side of the friction rings and a plurality of first sub-tray body connecting claws 1-3 which are positioned on the inner ring of the friction rings 1-1 and are uniformly distributed in the circumferential direction;

the second sub-disc body 2 is composed of two semicircular second sub-disc body friction rings 2-1, a second sub-disc body first heat dissipation rib 2-2 for connecting the two friction rings 2-1, a second sub-disc body second heat dissipation rib 2-8 positioned on the inner side of the friction rings and a plurality of second sub-disc body connecting claws 2-3 which are positioned on the inner ring of the friction rings 2-1 and are uniformly distributed in the circumferential direction.

A first tray body boss 1-4 is designed between two friction rings 1-1 at the diameter position of the first tray body 1, a first connecting hole 1-5 for accommodating a bolt 3 for connecting the two tray bodies is designed in the middle of the first tray body boss 1-4 in a penetrating manner, and the first connecting hole is of a countersunk step hole structure; a second chuck body boss 2-4 is designed between two friction rings 2-1 at the diameter position of the second chuck body 2. And a second connecting hole 2-5 for accommodating a bolt 3 for connecting the two half disc bodies is arranged in the middle of the boss 2-4 of the second sub disc body in a penetrating manner, and is of a countersunk step hole structure.

A half tray body connecting convex key 1-6 is designed on a first tray body boss 1-4 of the first tray body 1; the convex key 1-6 is positioned on the connection surface of the first split disc body, extends out of the connection surface of the first split disc body and comprises a first positioning surface 1-6-1 and a first force transmission surface 1-6-2;

correspondingly, a half tray body connecting groove 2-6 is designed on a second tray body boss 2-4 of the second tray body 2; the groove 2-6 is positioned on the connecting surface of the second sub disc body and is recessed from the connecting surface of the second sub disc body, and comprises a second positioning surface 2-6-1 and a second force transmission surface 2-6-2;

the connecting surface of the first sub-tray body is positioned on the middle split surface 1-7 of the first sub-tray body, and the connecting surface of the second sub-tray body is positioned on the middle split surface 2-7 of the second sub-tray body.

The first positioning surface 1-6-1 and the second positioning surface 2-6-1 are planes parallel to the connection surface of the first split plate body and the connection surface of the second split plate body, an included angle between a normal vector (characteristic normal vector) of the first positioning surface 1-6, which points to the inside of the convex key 1-6, and a normal vector (characteristic normal vector) of a certain tangent plane of the first power transmission surface 1-6-2, which points to the inside of the convex key 1-6, is equal to 90 degrees, and an included angle between a normal vector (characteristic normal vector) of the second positioning surface 2-6-1, which points to the inside of the groove, and a normal vector (characteristic normal vector) of a certain tangent plane of the second power transmission surface 2-6-2, which points to the inside of the groove, is equal to 90 degrees.

Specifically, the convex keys 1-6 adopt a cylindrical boss structure, the first connecting piece penetrates through the convex keys 1-6, and the grooves 2-6 are matched with the convex keys 1-6;

the head of the bolt 3 is designed with two groups of cotter pin mounting holes which are crossed vertically and are used for mounting cotter pins 6.

The nut 5 adopts an outer hexagonal nut structure, and a groove is formed in the middle of each side edge of the head of the nut and is used for installing the cotter pin 6 and attaching the cotter pin to the side edge of the nut 5.

The heat dissipation ribs on the first tray body 1 and around the bolts 3 adopt circumferential contour variable-height first tray body second heat dissipation ribs 1-8 which are circumferentially arranged according to the outer diameter of a mounting sleeve of the bolts;

the heat dissipation ribs on the second sub-tray body 2 and positioned around the bolts 3 adopt second heat dissipation ribs 2-8 with variable heights in a circumferential profile which is circumferentially arranged according to the outer diameter of a mounting sleeve of the bolts;

the second heat dissipation ribs form mounting channels with circular sections, and the diameters of the mounting channels are larger than the outer diameter of the mounting sleeve of the first connecting piece.

The convex keys 1-6 and the grooves 2-6 of the two designed half disc bodies are in clearance fit, so that the first sub disc body 1 and the second sub disc body 2 can be spliced and assembled conveniently.

The bolts 3 of the two half disc bodies are in clearance fit with the first bolt holes 1-5 and the second bolt holes 2-5, so that the assembly and disassembly are convenient, and the overhaul and the maintenance are convenient.

Meanwhile, the fit clearance in the radial direction of the bolts 3 between the first power transmission surface 1-6-2 of the first sub-disc body 1 and the second power transmission surface 2-6-2 of the second sub-disc body 2 is smaller than the fit clearance between the bolts 3 of the two sub-disc bodies and the first bolt holes 1-5/the second bolt holes 2-5. Therefore, after the first sub-tray body 1 is connected with the second sub-tray body 2 in a positioning mode, the bolts 3 for connecting the two sub-tray bodies are loosely arranged in the first connecting holes 1-5 and the second connecting holes 2-5, and the bolts 3 are guaranteed not to be in contact with the side faces of the first connecting holes 1-5 and the second connecting holes 2-5 in the assembling and braking processes through structural size and tolerance design.

Through the structure and size design, the bolts 3 are not interfered with the second heat dissipation ribs 1-8 with variable heights on the first sub-tray body 1 and the second heat dissipation ribs 2-8 with variable heights on the second sub-tray body 2 when being connected and installed by the sleeves.

When the split-type bearing is assembled, the first split-type bearing body 1 and the second split-type bearing body 2 are positioned through the first positioning surface 1-6-1 and the second positioning surface 2-6-1, and the first force transmission surface 1-6-2 is connected with the second force transmission surface 2-6-2 in a matching mode.

And the spacer bushes 4 are placed on the countersunk heads at the end parts of the first connecting holes 1-5 of the first sub tray body 1 and the countersunk heads at the end parts of the second connecting holes 2-5 of the second sub tray body 2, and two groups of bolts 3 are penetrated into the first connecting holes 1-5 of the first sub tray body 1 and the second connecting holes 2-5 of the second sub tray body 2 in the circumferential direction in the same mounting direction and are fastened by nuts 5 respectively.

Furthermore, a cotter pin 6 is inserted into the cotter pin mounting holes of the two sets of bolts 3, and the cotter pin 6 is attached to the side edge of the nut 5, thereby integrally connecting the first sub-tray body 1 and the second sub-tray body 2.

When the maintenance and the replacement are carried out, only the cotter pin 6 needs to be pried, the cotter pin 6 is taken out from the grooving of the nut 5 and the cotter pin mounting hole of the bolt 3, then the nut 5 is loosened, the spacer bush 4 and the bolt 3 are separated, and the decomposition of the first tray body 1 and the second tray body 2 can be completed.

After the two half disc bodies are decomposed, the two half disc bodies are pulled apart to complete the disassembly of the brake disc, and then the brake disc is replaced by a new one.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

the designed structure of the convex key 1-6 and the groove 2-6 can ensure the positioning and mounting precision of the two half disc bodies through the matching of the first positioning surface 1-6-1 of the convex key and the second positioning surface 2-6-1 of the groove and the matching of the first force transmission surface 1-6-2 of the convex key and the second force transmission surface 2-6-2 of the groove, thereby ensuring the mounting precision of the bolt 3 and the first connecting hole 1-5 and the second connecting hole 2-5 for accommodating the bolt.

Under the normal working condition of the brake disc, the structures of the convex keys 1-6 and the grooves 2-6 can ensure that the circumferential friction acting force generated by the brake pad on the two sub-disc bodies can be shared by the first force transmission surfaces 1-6-2 of the convex keys and the second force transmission surfaces 2-6-2 of the grooves, so that the axial acting force on the connecting bolts of the two half disc bodies is reduced, the working load of the bolts 3 is reduced, and the effective protection on bolt connection is formed.

When the bolts 3 connecting the first split disc body 1 and the second split disc body 2 are not enough in bolt connection axial force or loose in bolt connection due to loose connection or connection failure, circumferential separation or circumferential separation trend may occur between the first split disc body 1 and the second split disc body 2 under the circumferential friction acting force of the brake pad, and the circumferential friction acting force generated by the brake pad on the two half disc bodies can be shared or completely borne by the first force transmission surface 1-6-2 of the convex key 1-6 of the first split disc body 1 and the second force transmission surface 2-6-2 of the groove 2-6 of the second split disc body 2, so that bolt connection is protected, and effective protection of the two half disc bodies is avoided.

Meanwhile, the radial fit clearance of the first force transmission surface 1-6-2 of the convex key 1-6 of the first sub disc body 1 and the second force transmission surface 2-6-2 of the groove 2-6 of the second sub disc body 2 is smaller than the fit clearance between the bolt 3 connected with the sub disc body and the first connecting hole 1-5 and the second connecting hole 2-5, namely, the bolt 3 is ensured not to be contacted with the side surface of the connecting hole under the conditions of assembly, normal braking, loosening or failure of fastening connection and the like through structural dimension and tolerance design. Therefore, when the disc body bears the action of thermal load in the braking process and generates radial outward expansion deformation, the radial expansion force can be borne by the first force transmission surface 1-6-2 of the convex key and the second force transmission surface 2-6-2 of the groove 2-6, and the bolt 3 is prevented from directly bearing shearing force.

The designed bolt 3 is loosely arranged in the first connecting hole 1-5 and the second connecting hole 2-5, so that the mounting is convenient, and the disassembly, the overhaul and the maintenance are easy; the convex keys 1-6 of the first sub tray body 1 and the grooves 2-6 of the second sub tray body 2 are in clearance fit, so that the assembly and disassembly are convenient, and the overhaul and the maintenance are convenient.

The designed second heat dissipation ribs 1-8 with variable heights on the first sub-disc body 1 and the second heat dissipation ribs 2-8 with variable heights on the second sub-disc body 2 ensure the working space of a sleeve used by the bolt 3 when the brake disc is installed and disassembled through structural and dimensional design; the heat dissipation ribs 1-8 of the first split disc body with variable height and the second heat dissipation ribs 2-8 of the second split disc body with variable height are additionally arranged on the inner sides of the two split disc body friction rings, so that the defect of local heat capacity caused by the design of connecting bolts is overcome, the temperature of the disc body at the connecting part of the connecting bolts of the two half disc bodies is reduced, and the reliability of bolt connection is improved; the circumferential profile variable-height heat dissipation rib designed according to the circumferential size of the outer diameter of the bolt 3 mounting sleeve improves the feeding capacity of the casting process to the disc ring part, and is beneficial to improving the local inner part and surface quality of the disc ring in the process.

The thread pair structure with the locking function is designed, the thread pair structure has reliable locking performance, and meanwhile, due to the design of the slotted locking nut and the split pin structure, loosening of the nut is effectively guaranteed, and reliability of bolt connection is guaranteed. Meanwhile, two groups of vertical cotter mounting holes are designed on the tail part of the bolt 3, so that cotter pins can be conveniently penetrated and installed.

Example 2

As shown in fig. 8-12, the first positioning surface 1-6-1 is parallel to the first force transmission surface 1-6-2, and the second positioning surface 2-6-1 is parallel to the second force transmission surface 2-6-2. Specifically, the grooves 2-6 are inverted groove-shaped. The first connecting piece is a bolt 3, the bolt 3 penetrates through the grooves 2-6, the grooves 2-6 penetrate through the connecting surface of the second split disc body in the axial direction of the brake disc, the width of the bottoms of the grooves 2-6 in the radial direction of the brake disc is larger than that of the tops of the grooves 2-6 in the radial direction of the brake disc, the convex keys 1-6 are matched with the grooves 2-6, and other technical characteristics are the same as those of the embodiment 1.

Example 3

As shown in fig. 13 to 17, an included angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first force transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is greater than 90 degrees, and an included angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second force transmission surface 2-6-2 pointing to the inside of the groove is greater than 90 degrees. Specifically, the grooves 2-6 are dovetail-shaped. The first connecting piece is a bolt 3, the bolt 3 penetrates through the grooves 2-6, the grooves 2-6 penetrate through the connecting surface of the second split disc body in the axial direction of the brake disc, the width of the bottom of the groove in the radial direction of the brake disc is larger than that of the top of the groove in the radial direction of the brake disc, the convex keys 1-6 are matched with the grooves 2-6, and other technical characteristics are the same as those of the embodiment 1.

Example 4

As shown in fig. 18 to 22, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is smaller than 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is smaller than 90 degrees. Specifically, the grooves 2 to 6 are trapezoidal groove-shaped. The first connecting piece is a bolt 3, the bolt 3 penetrates through the grooves 2-6, the grooves 2-6 penetrate through the connecting surface of the second split disc body in the axial direction of the brake disc, the width of the bottoms of the grooves 2-6 in the radial direction of the brake disc is smaller than that of the tops of the grooves 2-6 in the radial direction of the brake disc, the convex keys 1-6 are matched with the grooves 2-6, and other technical characteristics are the same as those of the embodiment 1.

Example 5

As shown in fig. 23 to 27, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is equal to 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is equal to 90 degrees. Specifically, the convex keys 1 to 6 are rectangular bosses. The first connecting piece is a bolt 3, the bolt 3 penetrates through the convex keys 1-6, the convex keys 1-6 penetrate through the connecting surface of the first split disc body in the axial direction of the brake disc, the grooves 2-6 are matched with the convex keys 1-6, and other technical characteristics are the same as those of the embodiment 1.

Example 6

As shown in fig. 28 to 32, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is equal to 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is equal to 90 degrees. Specifically, the first connecting member is a bolt 3, the first connecting member is a key 1-6 including a first key portion and a second key portion which are located on the first sub-disc body connecting surface and symmetrically arranged on two sides of the bolt 3, the first key portion and the second key portion penetrate the first sub-disc body connecting surface in the axial direction of the brake disc, and the groove 2-6 includes a first groove portion and a second groove portion which are located on the second sub-disc body connecting surface and matched with the first key portion and the second key portion, and other technical features are the same as those of embodiment 1.

Example 7

As shown in fig. 33-37, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is smaller than 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is smaller than 90 degrees. Specifically, the first connecting member is a bolt 3, the grooves 2 to 6 include a first groove portion and a second groove portion, which are in a trapezoidal groove shape and are located on the second split disc body connecting surface and symmetrically arranged on two side surfaces of the bolt 3, respectively, the first groove portion and the second groove portion penetrate through the second split disc body connecting surface in the axial direction of the brake disc, and the width of the bottom of the first groove portion and the second groove portion in the radial direction of the brake disc is smaller than the width of the top of the first groove portion and the second groove portion in the radial direction of the brake disc, the protruding keys 1 to 6 include a first protruding key portion and a second protruding key portion which are located on the first split disc body connecting surface and are matched with the first groove portion and the second groove portion, and other technical features are the same as those of embodiment 1.

Example 8

As shown in fig. 38 to 44, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is equal to 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is equal to 90 degrees. Specifically, the key 1-6 is a rectangular boss asymmetrically arranged on one side of the first connecting member, the key 1-6 penetrates through the connecting surface of the first rotor body in the axial direction of the brake disc, the groove 2-6 is matched with the key 1-6, the first connecting member is a bolt 3, and other technical characteristics are the same as those of the embodiment 1.

Example 9

As shown in fig. 45 to 51, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is equal to 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is equal to 90 degrees. Specifically, the keys 1 to 6 are rectangular bosses asymmetrically arranged on one side of the first connecting member in the axial direction of the brake disk, the keys 1 to 6 protrude from the first rotor body connecting surface in the circumferential direction of the first rotor body and partially cover the first rotor body connecting surface in both the axial direction and the radial direction of the brake disk, the grooves 2 to 6 are fitted to the keys 1 to 6, the first connecting member is a bolt 3, and other technical features are the same as those of embodiment 1.

Example 10

As shown in fig. 52 to 57, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is equal to 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is equal to 90 degrees. Specifically, the brake disc is composed of four sub disc bodies, wherein all protection parts on four connection surfaces of two sub disc bodies are the convex keys 1-6, all protection parts on four connection surfaces of the other two sub disc bodies are the grooves 2-6, the convex keys 1-6 are rectangular bosses asymmetrically arranged on one side of a connecting piece along the axial direction of the brake disc, the convex keys 1-6 protrude out of the connection surfaces in the circumferential direction of the brake disc and partially cover the connection surfaces in the axial direction and the radial direction of the brake disc, the grooves 2-6 are matched with the convex keys 1-6, the connecting piece is a bolt 3, and other technical characteristics are the same as those of the embodiment 1.

Example 11

As shown in fig. 58 to 61, an angle between a normal vector of the first positioning surface 1-6-1 pointing to the inside of the convex key 1-6 and a normal vector of the first power transmission surface 1-6-2 pointing to the inside of the convex key 1-6 is equal to 90 degrees, and an angle between a normal vector of the second positioning surface 2-6-1 pointing to the inside of the groove and a normal vector of the second power transmission surface 2-6-2 pointing to the inside of the groove is equal to 90 degrees. Specifically, the brake disc is composed of four sub disc bodies, wherein the protection parts on two connecting surfaces of each sub disc body are respectively the convex keys 1-6 and the concave grooves 2-6, the convex keys 1-6 are rectangular bosses asymmetrically arranged on one side of a connecting piece along the axial direction of the brake disc, the convex keys 1-6 protrude out of the connecting surfaces in the circumferential direction of the brake disc and partially cover the connecting surfaces in the axial direction and the radial direction of the brake disc, the concave grooves 2-6 are matched with the convex keys 1-6, the connecting piece is a bolt 3, and other technical characteristics are the same as those of the embodiment 1.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A split brake disc comprises a first split disc body, a second split disc body and a first connecting piece used for connecting the first split disc body and the second split disc body, wherein the first split disc body is provided with a first split disc body connecting surface, the second split disc body is provided with a second split disc body connecting surface opposite to the first split disc body connecting surface, the first connecting piece is connected with the first split disc body and the second split disc body through a first connecting hole in the first split disc body connecting surface and a second connecting hole in the second split disc body connecting surface, the split brake disc is characterized by further comprising a protection structure used for the first connecting piece, the protection structure comprises a first protection portion arranged on the first split disc body and a second protection portion arranged on the second split disc body, and the first protection portion and the second protection portion jointly act to bear force or torque generated by the first split disc body and the second split disc body so as to reduce or avoid the force or torque from being transmitted to the first connecting piece;

the first protection part is at least one convex key protruding out of the connecting surface of the first sub tray body, and the second protection part is at least one groove recessed in the connecting surface of the second sub tray body;

the convex key comprises a first positioning surface and a first force transmission surface, the groove comprises a second positioning surface and a second force transmission surface, the first positioning surface and the second positioning surface have the function of positioning the first sub-tray body and the second sub-tray body, and the first force transmission surface and the second force transmission surface have the function of bearing the force or torque generated by the first sub-tray body and the second sub-tray body;

the first connecting piece is in clearance fit with the first connecting hole and/or the second connecting hole, and the convex key is in clearance fit with the groove, and in the radial direction of the first connecting piece, the fit clearance between the first force transmission surface and the second force transmission surface is smaller than the fit clearance between the first connecting piece and the first connecting hole and/or between the first connecting piece and the second connecting hole, so that the split brake disc is convenient to assemble and disassemble, and convenient to overhaul and maintain; the first connecting piece, first connecting hole and second connecting hole design are so that first branch disk body with when the second divides the disk body location to connect, first connecting piece with first connecting hole and/or the side of second connecting hole contactless, this makes the first connecting piece of split type brake disc arrange first connecting hole and second connecting hole in with becoming flexible, and guarantees through structural dimension and tolerance design that first connecting piece does not contact with first connecting hole and second connecting hole side in equipment and braking process.

2. The split brake disc of claim 1, wherein the first protection portion is formed on the first rotor connection surface, and the second protection portion is formed on the second rotor connection surface.

3. The split brake disc of claim 1, wherein the first and second protection portions cooperate to receive a circumferential force transmitted by the first and second rotor during normal braking, a circumferential separation tendency, or a circumferential separation, and reduce or prevent the transmission of the circumferential force to the first connecting member.

4. The split brake disc of claim 1, wherein the first protection portion and the second protection portion cooperate to receive a radial acting force transmitted by the first split disc body and the second split disc body during a normal braking process, a circumferential separation tendency or a circumferential separation, and reduce or prevent the radial acting force from being transmitted to the first connecting piece.

5. The split brake disc of claim 1, wherein the first connectors pass through the tabs and/or grooves.

6. The split brake disc of claim 1, wherein the splines and/or grooves are arranged on one side of the first connectors in a radial or axial direction of the brake disc.

7. The split brake disc of claim 1, wherein the raised keys comprise first and second raised key portions and the grooves comprise first and second groove portions, wherein the first and second raised key portions are located on the first segment disc connection surface and the first and second groove portions are located on the second segment disc connection surface; or the first convex key part and the first groove part are positioned on the first sub tray body connecting surface, and the second convex key part and the second groove part are positioned on the second sub tray body connecting surface.

8. The split brake disc of claim 1, wherein the protruding key penetrates the first disc body connecting surface and/or the second disc body connecting surface in the axial direction of the brake disc, and the groove is matched with the protruding key.

9. The split brake disc of claim 1, wherein the protrusion key protrudes from the first disc body connection surface and/or the second disc body connection surface in a circumferential direction of the brake disc and partially covers the first disc body connection surface and/or the second disc body connection surface in an axial direction and/or a radial direction of the brake disc, and the groove is fitted to the protrusion key.

10. The split brake disc of claim 1, wherein the first positioning surface and the second positioning surface are planes parallel to the first rotor connecting surface and the second rotor connecting surface, an included angle between a characteristic normal vector of the first positioning surface and a characteristic normal vector of the first power transmission surface is smaller than 90 degrees, and an included angle between a characteristic normal vector of the second positioning surface and a characteristic normal vector of the second power transmission surface is smaller than 90 degrees; the feature normal vectors of the first positioning surface, the first force transmission surface, the second positioning surface and the second force transmission surface are respectively as follows: the first positioning surface points to the normal vector inside the convex key, the first force transmission surface or a certain tangent plane of the first force transmission surface points to the normal vector inside the convex key, the second positioning surface points to the normal vector inside the groove, and the second force transmission surface or a certain tangent plane of the second force transmission surface points to the normal vector inside the groove.

11. The split brake disc of claim 10, wherein the groove is a trapezoidal groove, the first connecting member passes through the groove, the groove penetrates the second split disc connecting surface in the axial direction of the brake disc, the width of the bottom of the groove in the radial direction of the brake disc is smaller than the width of the top of the groove in the radial direction of the brake disc, and the protruding key is fitted into the groove.

12. The split brake disc of claim 10, wherein the grooves include first and second groove portions of a trapezoidal groove type provided on the second rotor connecting surface and disposed at both sides of the first connecting member, the first and second groove portions penetrating the second rotor connecting surface in the axial direction of the brake disc, and a width of a bottom portion thereof in the radial direction of the brake disc being smaller than a width of a top portion thereof in the radial direction of the brake disc, the projecting keys include first and second projecting key portions provided on the first rotor connecting surface and fitted with the first and second groove portions.

13. The split brake disc of claim 1, wherein the first positioning surface and the second positioning surface are planes parallel to the first rotor connecting surface and the second rotor connecting surface, an included angle between a normal characteristic vector of the first positioning surface and a normal characteristic vector of the first power transmission surface is greater than 90 degrees, and an included angle between a normal characteristic vector of the second positioning surface and a normal characteristic vector of the second power transmission surface is greater than 90 degrees; the feature normal vectors of the first positioning surface, the first force transmission surface, the second positioning surface and the second force transmission surface are respectively as follows: the first positioning surface points to the normal vector inside the convex key, the first force transmission surface or a certain tangent plane of the first force transmission surface points to the normal vector inside the convex key, the second positioning surface points to the normal vector inside the groove, and the second force transmission surface or a certain tangent plane of the second force transmission surface points to the normal vector inside the groove.

14. The split brake disc of claim 13, wherein the groove is a dovetail groove, the first connecting member passes through the groove, the groove penetrates the second split disc connecting surface in the axial direction of the brake disc, the width of the bottom of the groove in the radial direction of the brake disc is larger than that of the top of the groove in the radial direction of the brake disc, and the protruding key is fitted into the groove.

15. The split brake disc of claim 1, wherein the first and second positioning surfaces are planes parallel to the first and second rotor connection surfaces, the first positioning surface is parallel to the first force transmission surface or a tangent plane to the first force transmission surface, and the second positioning surface is parallel to the second force transmission surface or a tangent plane to the second force transmission surface.

16. The split brake disc of claim 15, wherein the grooves are of an inverted groove type, the first connecting members pass through the grooves, the grooves penetrate through the second split disc body connecting surface in the axial direction of the brake disc, the width of the bottoms of the grooves in the radial direction of the brake disc is larger than that of the tops of the grooves in the radial direction of the brake disc, and the splines are fitted into the grooves.

17. The split brake disc of claim 1, wherein the first positioning surface and the second positioning surface are planes parallel to the first rotor connecting surface and the second rotor connecting surface, an angle between a normal characteristic vector of the first positioning surface and a normal characteristic vector of the first power transmission surface is equal to 90 degrees, and an angle between a normal characteristic vector of the second positioning surface and a normal characteristic vector of the second power transmission surface is equal to 90 degrees; the feature normal vectors of the first positioning surface, the first force transmission surface, the second positioning surface and the second force transmission surface are respectively as follows: the first positioning surface points to the normal vector inside the convex key, the first force transmission surface or a certain tangent plane of the first force transmission surface points to the normal vector inside the convex key, the second positioning surface points to the normal vector inside the groove, and the second force transmission surface or a certain tangent plane of the second force transmission surface points to the normal vector inside the groove.

18. The split brake disc of claim 17, wherein the protrusion is a cylindrical boss, the first connecting member passes through the protrusion, and the groove is matched with the protrusion.

19. The split brake disc of claim 17, wherein the protruding key is a rectangular boss, the first connecting member passes through the protruding key, the protruding key penetrates through the first rotor connecting surface in the axial direction of the brake disc, and the groove is matched with the protruding key.

20. The split brake disc of claim 17, wherein the raised keys comprise first and second raised rectangular key portions on the first rotor body connecting surface and arranged on both sides of the first connecting member in the radial direction of the brake disc, the first and second key portions penetrating the first rotor body connecting surface in the axial direction of the brake disc, and the grooves comprise first and second groove portions on the second rotor body connecting surface and fitted with the first and second key portions.

21. The split brake disc of claim 17, wherein the protrusion is a rectangular boss located on the first rotor connecting surface and asymmetrically arranged on one side of the first connecting member in the radial direction of the brake disc, the protrusion penetrates the first rotor connecting surface in the axial direction of the brake disc, and the groove is fitted to the protrusion.

22. The split brake disc of claim 17, wherein the protrusion key is a rectangular boss disposed at one side of the first coupling member in the axial direction of the brake disc, the protrusion key protrudes from the first rotor connection surface in the circumferential direction of the first rotor and partially covers the first rotor connection surface in both the axial direction and the radial direction of the brake disc, and the groove is fitted to the protrusion key.

23. The split brake disc of claim 17, wherein the brake disc is composed of four split discs, wherein the protection portions on four connection surfaces of two split discs are the protruding keys, the protection portions on four connection surfaces of the other two split discs are the grooves, the protruding keys are rectangular bosses disposed on one side of the connection member in the axial direction of the brake disc, the protruding keys protrude from the connection surfaces in the circumferential direction of the brake disc and partially cover the connection surfaces in both the axial direction and the radial direction of the brake disc, and the grooves are matched with the protruding keys.

24. The split brake disc of claim 17, wherein the brake disc is composed of four split discs, wherein the protection portions on the two connecting surfaces of each split disc are the protruding key and the groove, respectively, the protruding key is a rectangular boss disposed on one side of the connecting member in the axial direction of the brake disc, the protruding key protrudes from the connecting surfaces in the circumferential direction of the brake disc and partially covers the connecting surfaces in both the axial direction and the radial direction of the brake disc, and the groove is matched with the protruding key.

25. The split brake disc of claim 1, wherein the first and second positioning surfaces are planes that are obliquely arranged with respect to the first and second segment disc connection surfaces at an angle of 0 to 90 degrees.

26. The split brake disc of claim 1, wherein at least one of the first positioning surface, the second positioning surface, the first force transfer surface, and the second force transfer surface is a curved surface.

27. The split brake disc of claim 1, wherein the first split disc body and/or the second split disc body comprises two arc-shaped friction rings, a boss is arranged between the two arc-shaped friction rings, the first split disc body connecting surface and the second split disc body connecting surface are located on the boss, and the first connecting hole and/or the second connecting hole are/is opened on the boss and are countersunk.

28. The split brake disc of claim 27, wherein the tabs or grooves protrude or are recessed from the surface of the boss.

29. The split brake disc of claim 27, wherein the inner ring of the friction ring is circumferentially and uniformly provided with a plurality of disc body connecting claws.

30. The split brake disc of any one of claims 1 to 4, wherein the first connector is a bolt, further comprising a nut to secure the bolt.

31. The split brake disc of claim 30, wherein the tail of the bolt is provided with a cross-shaped vertically crossed cotter pin mounting hole, the nut is an outer hexagonal nut, and a cotter pin mounting groove is formed in the middle of each side edge of the head of the nut.

32. The split brake disc of claim 30, wherein the first and/or second split disc body comprises two arcuate friction rings with a boss therebetween, the first and second split disc body connection faces being located at the boss, and further comprising a spacer located between a head of the bolt and the boss, and/or the spacer located between the nut and the boss.

33. The split brake disc of claim 30, wherein the installation direction of the bolts in the circumferential direction of the brake disc is the same.

34. The split brake disc of any one of claims 1 to 4, further comprising heat dissipation ribs provided inside the first and/or second split disc bodies, the heat dissipation ribs including a first heat dissipation rib distant from the first and second connection holes and a second heat dissipation rib adjacent to the first and second connection holes, the second heat dissipation rib being different in shape from the first heat dissipation rib.

35. The split brake disc of claim 34, wherein the first and/or second split disc bodies comprise two arcuate friction rings, the first heat dissipating ribs being connected to the two friction rings.

36. The split brake disc of claim 34, wherein the second heat dissipating ribs are designed to have a height that forms a space for the first connecting member to pass through.

37. The split brake disc of claim 36, wherein the space formed by the second heat dissipation ribs is a mounting channel having a circular cross section.

38. The split brake disc of claim 37, wherein the diameter of the mounting channel is greater than the outer diameter of the mounting sleeve of the first connector.

39. The split brake disc of any one of claims 1 to 4, wherein the brake disc comprises more than 2, 3, 4, 5 or 6 split discs.

40. The split brake disc of claim 39, wherein the split disc body is a half disc body, the brake disc is composed of 2 half disc bodies, and the first split disc body connecting surface and the second split disc body connecting surface are located at one bisecting plane of the brake disc.

41. The split brake disc of claim 39, wherein the split discs are quarter discs, and the brake disc is composed of 4 quarter discs, and the connection surfaces of the split discs are located on two perpendicular bisectors of the brake disc.