Brake disc fastening connection kit

Abstract

The invention aims to provide a brake disc fastening connection kit which is used for connecting a disc body and a disc hub of a brake disc, and relates to the technical field of train brake systems, the brake disc fastening connection kit comprises a bolt, a first bolt sleeve, a second bolt sleeve and a nut, the bolt sequentially penetrates through the first bolt sleeve, the disc hub, the disc body, the second bolt sleeve and the nut, and the first bolt sleeve is connected with the second bolt sleeve. The bolt is in threaded fit with the nut, the first bolt sleeve, the disc hub, the disc body, the second bolt sleeve and the nut are fixedly connected together, the supporting face of a bolt head of the bolt is in spherical fit with the first bolt sleeve, and the supporting face of the second bolt sleeve is in spherical fit with the supporting face of the nut. According to the brake disc fastening connection kit, the bending load of the bolt can be eliminated, the impact load of the bolt is reduced, the thermal stress of the brake disc is released, and therefore the fatigue life of the bolt is prolonged.

Description

Technical Field

[0001] This invention relates to the field of train braking system technology, and in particular to a brake disc fastening connection kit. Background Technology

[0002] The axle-mounted brake disc of a high-speed train is a key component of the train braking system, and its reliability directly affects the safety of train operation.

[0003] Existing axle-mounted brake discs mainly consist of a disc body, hub, pressure ring, bolts, and nuts. The disc body, hub, and pressure ring are connected together by bolts and nuts, with the disc body connecting boss in the middle and the pressure ring and hub connecting bosses on both sides, forming a "sandwich" structure. During high-speed train braking, kinetic energy is converted into heat energy through friction between the axle-mounted brake disc and brake pads, subjecting the axle-mounted brake disc to a significant thermal load. Thermal deformation of the axle-mounted brake disc causes the bolts to bear tensile and bending moments. Since bolts are sensitive to bending loads, frequent bending loads reduce bolt life and lead to fatigue fracture. Furthermore, frequent vibration and impact also cause bending loads on the axle-mounted brake disc bolts. Currently, the problem of fatigue fracture of brake disc bolts due to bending loads remains a persistent issue.

[0004] Currently, the industry mainly improves the bending fatigue life of bolts by using variable diameter bolts, longer bolts, and increasing the number of bolts. Although these methods reduce the bending stress of the bolts and can improve the fatigue life to some extent, they do not eliminate the bending load at its source. When encountering more severe line conditions (such as electric brake failure, line corrugation, etc.), the bolts will still experience greater bending stress, leading to fatigue fracture.

[0005] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a brake disc fastening connection kit through repeated experiments in order to solve the problems existing in the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a brake disc fastening connection kit that can eliminate bolt bending load, reduce bolt impact load, release brake disc thermal stress, thereby extending the fatigue life of the bolt.

[0007] To achieve the above objectives, the present invention proposes a brake disc fastening connection kit for connecting the disc body and the disc hub of a brake disc. The brake disc fastening connection kit includes a bolt, a first bolt sleeve, a second bolt sleeve, and a nut. The bolt sequentially passes through the first bolt sleeve, the disc hub, the disc body, the second bolt sleeve, and the nut. The bolt and the nut are threaded together, fixing the first bolt sleeve, the disc hub, the disc body, the second bolt sleeve, and the nut together. The supporting surface of the bolt head and the first bolt sleeve, as well as the supporting surface of the nut and the second bolt sleeve, respectively form a spherical fit.

[0008] Compared with the prior art, the present invention has the following features and advantages:

[0009] The brake disc fastening connection kit proposed in this invention automatically compensates for coaxiality and angular deviations that may occur during bolt assembly or loading by using two spherical fits between the bolt head and the first bolt sleeve, and between the nut and the second bolt sleeve. This ensures uniform distribution of preload, avoids stress concentration on the bolt, and significantly improves the bolt's fatigue resistance. Furthermore, the spherical fit structure also provides a certain degree of self-adjustment between the bolt head and the first bolt sleeve, and between the nut and the second bolt sleeve, better adapting to vibrations and impacts generated during vehicle operation. Attached Figure Description

[0010] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0011] Figure 1 This is a schematic diagram of the assembly of the brake disc fastening connection kit proposed in this invention;

[0012] Figure 2 This is a schematic diagram of the brake disc fastening connection structure in this invention;

[0013] Figure 3 This is a schematic diagram of the structure of the disk body in this invention;

[0014] Figure 4 This is a schematic diagram of the structure of the hub in this invention;

[0015] Figure 5 This is a schematic diagram of the bolt structure in this invention;

[0016] Figure 6 This is a schematic diagram of the nut structure in this invention;

[0017] Figure 7 This is a schematic diagram of the structure of the first bolt sleeve in this invention;

[0018] Figure 8 This is a schematic diagram of the structure of the second bolt sleeve in this invention;

[0019] Figure 9 This is a schematic diagram of the elastic pin sleeve in this invention;

[0020] Figure 10 This is a schematic diagram of the slider in this invention.

[0021] Explanation of reference numerals in the attached figures

[0022] 100. Brake disc fastening connection kit; 1. Disc body; 2. Disc hub; 21. Stepped hole; 22. Bolt hole; 3. Pressure ring; 4. Bolt; 41. Support surface of bolt head; 5. Nut; 51. Support surface of nut; 6. First bolt sleeve; 61. Spherical surface of first bolt sleeve; 7. Second bolt sleeve; 71. Spherical surface of second bolt sleeve; 8. Elastic pin sleeve; 9. Slider; 11. Slide groove. Detailed Implementation

[0023] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, and these should all be considered to fall within the scope of the invention.

[0024] like Figures 1 to 10 As shown, the present invention proposes a brake disc fastening connection kit 100 for connecting the disc body 1 and the disc hub 2 of a brake disc. The brake disc fastening connection kit 100 includes a bolt 4, a first bolt sleeve 6, a second bolt sleeve 7, and a nut 5. The bolt 4 passes through the first bolt sleeve 6, the disc hub 2, the disc body 1, the second bolt sleeve 7, and the nut 5 in sequence. The bolt 4 and the nut 5 are threaded together and fix the first bolt sleeve 6, the disc hub 2, the disc body 1, the second bolt sleeve 7, and the nut 5 together. The supporting surface of the bolt head of the bolt 4 forms a spherical fit with the first bolt sleeve 6 and the supporting surface of the second bolt sleeve 7 and the nut 5, respectively.

[0025] The brake disc fastening connection kit 100 proposed in this invention automatically compensates for coaxiality and angular deviations that may occur in the bolt 4 during assembly or under load through two spherical fits between the bolt head and the first bolt sleeve 6, and between the nut 5 and the second bolt sleeve 7. This ensures uniform distribution of preload and avoids stress concentration on the bolt 4, thereby significantly improving the fatigue resistance of the bolt 4. Furthermore, the spherical fit structure also provides a certain degree of self-adjustment between the bolt head and the first bolt sleeve 6, and between the nut and the second bolt sleeve 7, enabling better adaptation to vibrations and impacts generated during vehicle operation.

[0026] The brake disc fastening connection kit 100 proposed in this invention greatly reduces the risk of bolt 4 breakage and brake disc loosening, ensuring driving safety, while also reducing maintenance needs and costs.

[0027] In an optional embodiment of the present invention, the support surface 41 of the bolt head is an outwardly convex spherical surface, and the first bolt sleeve 6 has an inwardly concave spherical surface 61 that mates with the support surface of the bolt head. With the above structure, after the brake disc fastening connection kit 100 fastens the brake disc body 1 and the disc hub 2, a hinge fulcrum is formed at the position of the support surface 41 of the bolt head, and the bolt 4 can generate axial preload, connecting the disc body 1 and the disc hub 2 together.

[0028] In an optional embodiment of the present invention, the supporting surface 51 of the nut is an outwardly convex spherical surface, and the second bolt sleeve 7 has an inwardly concave spherical surface 71 that mates with the supporting surface of the nut 5. With the above structure, after the brake disc fastening connection kit 100 fastens the brake disc body 1 and the disc hub 2, a hinge fulcrum is formed at the position of the supporting surface 51 of the nut, and the bolt 4 can generate axial preload, connecting the disc body 1 and the disc hub 2 together. Furthermore, when the disc body 1 and the disc hub 2 experience displacement perpendicular to the bolt 4 due to thermal expansion or vibration, the working load on the bolt 4 remains along the axial direction of the bolt 4, and the shank of the bolt 4 will not be subjected to bending load.

[0029] In an optional example of this embodiment, after the disc body 1 and the disc hub 2 are clamped, a hinge fulcrum is formed at the position of the nut support surface 51 and the position of the bolt head support surface 41. The bolt 4 is only subjected to tensile load along the bolt 4 axis and will not be subjected to bending load, which can improve the fatigue life of the bolt 4.

[0030] The brake disc fastening connection kit 100 proposed in this invention can eliminate the bending fatigue load of bolt 4 compared with existing fasteners. When bolt 4 is subjected to lateral force, the brake disc fastening connection kit 100 can convert the lateral force into axial tensile force on bolt 4, preventing bolt 4 from bending and improving the fatigue life of bolt 4. When the clamped disc body 1 and disc hub 2 undergo lateral displacement or oscillation, bolt 4 will not be subjected to bending moment, but only axial tensile force.

[0031] In an optional example of this implementation, the center of the ball of the support surface of the nut 5 is located on the thread center line of the nut 5, and the threaded hole of the nut 5 passes through the support surface 51 (arc spherical surface) of the nut.

[0032] In an optional example of this embodiment, the maximum intersection circle diameter of the support surface 51 of the nut is not greater than the maximum outer diameter of the nut 5, and the minimum intersection circle diameter of the support surface 51 of the nut is not less than the major diameter of the thread of the nut 5.

[0033] In an optional example of this embodiment, the support surface 41 of the bolt head of the bolt 4 is an outwardly convex spherical surface, and the center of the arc spherical surface of the support surface 41 of the bolt head is located on the thread center line, and the bolt shank of the bolt 4 passes through the arc spherical surface.

[0034] In an optional example of this embodiment, the maximum intersection circle diameter of the support surface 41 of the bolt head of the bolt 4 is not greater than the maximum outer diameter of the bolt head, and the minimum intersection circle diameter of the support surface 41 of the bolt head is not less than the major diameter of the thread of the bolt 4.

[0035] In one optional embodiment, the center of the spherical surface 61 of the first bolt sleeve and the center of the spherical surface 71 of the second bolt sleeve are located on the center line of the bolt hole, and the bolt hole passes through the spherical surface 61 of the first bolt sleeve and the spherical surface 71 of the second bolt sleeve.

[0036] In an optional example, the maximum diameter of the intersection circle of the spherical surface 61 of the first bolt sleeve should not be greater than the maximum outer diameter of the first bolt sleeve 6, and the minimum diameter of the intersection circle should not be less than the major diameter of the bolt hole of the first bolt sleeve 6. The maximum diameter of the intersection circle of the spherical surface 71 of the second bolt sleeve should not be greater than the maximum outer diameter of the spherical surface 71 of the second bolt sleeve, and the minimum diameter of the intersection circle should not be less than the major diameter of the bolt hole of the second bolt sleeve 7.

[0037] In an optional example, the bearing surface 41 of the bolt head has the same radius as the spherical surface 61 of the first bolt sleeve. The bearing surface 51 of the nut has the same radius as the spherical surface 71 of the second bolt sleeve.

[0038] In an optional example of this embodiment, the contact surface between the first bolt sleeve 6 and the hub 2, and the contact surface between the second bolt sleeve 7 and the disc body 1 are both planar.

[0039] In an optional embodiment of the present invention, the brake disc fastening connection kit 100 further includes a sliding component, which has an elastic pin sleeve 8 and a slider 9. The slider 9 has an inner hole, the elastic pin sleeve 8 is inserted into the inner hole, the bolt 4 passes through the elastic pin sleeve 8, and the disc body 1 has a sliding groove 11, in which the slider 9 is slidably disposed.

[0040] In this embodiment, the spherical fit structure between the bolt head and the first bolt sleeve 6, and between the nut 5 and the second bolt sleeve 7, is simultaneously equipped with an elastic pin sleeve 8 and a slider 9. The elastic pin sleeve 8 can limit large displacement rotation between the disc body 1 and the disc hub 2, preventing the bolt 4 from being subjected to shearing action. In addition, the slider 9 can slide radially along the disc hub 2 to compensate for displacement caused by thermal expansion, preventing excessive stress on the parts.

[0041] In this embodiment, the combination of the spherical mating structure, the elastic pin sleeve 8, and the slider 9 can produce new technical effects, which can eliminate the bending load of the bolt 4, reduce the impact load of the bolt 4, and release the thermal stress of the brake disc, thereby extending the fatigue life of the bolt 4.

[0042] It should be noted that the thermal deformation direction of the brake disc of a high-speed train is not ideal radial or circumferential, but irregular thermal deformation. Irregular thermal deformation will generate large stress between the disc body 1 and the slider 9. The elastic pin sleeve 8 in this invention is different from ordinary sliding pins and can produce better positioning and deformation adaptation effects.

[0043] Specifically, the elastic pin sleeve 8 can generate a certain amount of elastic deformation, thereby reducing thermal stress and adapting to the irregular deformation of the brake disc caused by thermal expansion.

[0044] In one optional example of this embodiment, the slider 9 has a round hole, one end of the elastic pin sleeve 8 engages with the slider 9, and the other end of the elastic pin sleeve 8 engages with the pin hole of the hub 2.

[0045] In an optional example, the elastic pin 8 is semi-circular with a central hole. The elastic pin 8 is inserted into the central hole of the slider 9 to form a sliding assembly.

[0046] Furthermore, the slider 9 is semi-circular, and the groove 11 of the disk body 1 is also semi-circular, with the slider 9 and the disk body 1 aligned and fitted together. With the above structure, the sliding assembly as a whole can slide along the groove of the disk body 1, releasing the thermal deformation of the disk body 1 and avoiding excessive thermal stress.

[0047] In an optional example of this embodiment, the inner edge of the disc body 1 has a first connecting boss for mounting the brake disc fastening connection kit 100, and a groove 11 is formed on the first connecting boss.

[0048] In an optional example, the center line of symmetry of the groove 11 is distributed radially.

[0049] In an optional example, the outer edge of the hub 2 has a second connecting boss that mates with the first connecting boss, and the second connecting boss has a stepped hole 21 or a bolt hole 22.

[0050] In an optional example, the inner edge of the disc body 1 is provided with a plurality of first connecting bosses, which are arranged sequentially and at intervals along the circumference of the disc body 1. The outer edge of the disc hub 2 is provided with second connecting bosses that correspond one-to-one with the plurality of first connecting bosses. Each set of aligned first connecting bosses and second connecting bosses is fixedly connected together by a brake disc fastening connection kit 100.

[0051] In an optional embodiment of the present invention, the brake disc further includes a pressure ring 3, which is located between the disc body 1 and the second bolt sleeve 7, and the bolt 4 passes through the pressure ring 3.

[0052] When assembling the brake disc fastening connection kit 100 proposed in this invention, the bolt 4 passes through the bolt hole of the clamped part (disc body 1, disc hub 2, pressure ring 3) and is connected to the nut 5. The supporting surface 51 of the nut mates with the spherical surface 61 of the first bolt sleeve, and the supporting surface 41 of the bolt head mates with the spherical surface 71 of the second bolt sleeve.

[0053] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A brake disc fastening connection kit for connecting the disc body and the hub of a brake disc, characterized in that, The brake disc fastening connection kit includes a bolt, a first bolt sleeve, a second bolt sleeve, and a nut. The bolt passes through the first bolt sleeve, the disc hub, the disc body, the second bolt sleeve, and the nut in sequence. The bolt and the nut are threaded together and fix the first bolt sleeve, the disc hub, the disc body, the second bolt sleeve, and the nut together. The supporting surface of the bolt head and the first bolt sleeve, as well as the supporting surface of the nut and the second bolt sleeve, respectively form a spherical fit.

2. The brake disc fastening connection kit as described in claim 1, characterized in that, The supporting surface of the bolt head is an outwardly convex spherical surface, and the first bolt sleeve has an inwardly concave spherical surface that mates with the supporting surface of the bolt head.

3. The brake disc fastening connection kit as described in claim 1 or 2, characterized in that, The supporting surface of the nut is an outwardly convex spherical surface, and the second bolt sleeve has an inwardly concave spherical surface that mates with the supporting surface of the nut.

4. The brake disc fastening connection kit as described in claim 3, characterized in that, The center of the ball on the support surface of the nut is located on the thread center line of the nut.

5. The brake disc fastening connection kit as described in claim 3, characterized in that, The maximum intersection circle diameter of the support surface of the nut is not greater than the maximum outer diameter of the nut, and the minimum intersection circle diameter of the support surface of the nut is not less than the major diameter of the thread of the nut.

6. The brake disc fastening connection kit as described in claim 2, characterized in that, The maximum intersection circle diameter of the support surface of the bolt head is not greater than the maximum outer diameter of the bolt head, and the minimum intersection circle diameter of the support surface of the bolt head is not less than the major diameter of the bolt thread.

7. The brake disc fastening connection kit as described in claim 2, characterized in that, The contact surface between the first bolt sleeve and the hub, and the contact surface between the second bolt sleeve and the disc body, are both planar surfaces.

8. The brake disc fastening connection kit as described in claim 1, characterized in that, The brake disc fastening connection kit also includes a sliding assembly, which has an elastic pin sleeve and a slider. The slider has an inner hole, the elastic pin sleeve is inserted into the inner hole, the bolt passes through the elastic pin sleeve, and the disc body has a sliding groove, in which the slider can slide.

9. The brake disc fastening connection kit as described in claim 8, characterized in that, The inner edge of the disc body has a first connecting boss for mounting the brake disc fastening connection kit, and the slide groove is formed on the first connecting boss.

10. The brake disc fastening connection kit as described in claim 9, characterized in that, The outer edge of the hub has a second connecting boss that aligns with the first connecting boss, and the second connecting boss has a stepped hole or a bolt hole.

11. The brake disc fastening connection kit as claimed in claim 1, characterized in that, The brake disc also includes a pressure ring, which is located between the disc body and the second bolt sleeve, and the bolt passes through the pressure ring.

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