CN111396474A - High-speed train brake pad with optimized friction particle combination and installation mode - Google Patents
High-speed train brake pad with optimized friction particle combination and installation mode Download PDFInfo
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- CN111396474A CN111396474A CN202010158203.9A CN202010158203A CN111396474A CN 111396474 A CN111396474 A CN 111396474A CN 202010158203 A CN202010158203 A CN 202010158203A CN 111396474 A CN111396474 A CN 111396474A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D69/0416—Attachment of linings specially adapted for curved linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/0006—Noise or vibration control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/78—Features relating to cooling
- F16D65/84—Features relating to cooling for disc brakes
- F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/004—Profiled friction surfaces, e.g. grooves, dimples
Abstract
The invention belongs to the technical field of friction braking, and particularly relates to a high-speed train brake pad with optimized friction particle combination and installation mode. The problems of single shape of friction particles, eccentric wear, high braking noise and uneven heat distribution of a braking interface on the conventional brake pad are solved. The technical scheme of the invention is as follows: the idea of combining friction particles of different shapes and materials is provided, and the friction particles of various shapes and materials are flexibly arranged in different areas, so that the advantages of the friction particles of various shapes and materials are comprehensively utilized; optimizing the fixing mode of the friction particles; the rotation prevention mode of the friction particles is optimized, and the guide shaft and the mounting hole are optimized to be cylindrical with non-circular cross-sectional shapes. The invention organically combines the advantages of friction particles with different shapes and materials, and improves the reliability, safety and comfort of the brake system.
Description
Technical Field
The invention belongs to the technical field of friction braking, and particularly relates to a high-speed train brake pad with optimized friction particle combination and installation mode.
Background
The high-speed train usually adopts disc brake, a brake disc is arranged on an axle or on the side surface of a wheel web, two brake pads are pressed against the brake disc by using a brake clamp, and the train stops advancing by generating brake force through friction. The braking mode can greatly reduce the thermal load and mechanical abrasion of the wheel tread because the acting force is not on the wheel tread. In addition, the disc brake has large friction area, stable braking and good braking effect. With the rapid development of national economy, the running speed of a high-speed train is increased day by day, and the highest operation speed is continuously broken through, so that stricter requirements on the safety and the reliability of a brake system are provided; meanwhile, people pay more attention to the comfort of train riding due to the improvement of living standard. Therefore, the optimal design is developed aiming at the safety, the reliability and the comfort of the brake pad, and the method has important engineering practical application significance.
At present, the brake pads in the brake system mostly adopt the same-shaped friction particles, such as hexagonal friction particles, circular friction particles and the like. However, the existing research already shows that the friction particles with different shapes have obvious differences in various expression forms of the braking performance, so that the brake pad structure cannot meet various performance requirements by simply adopting the friction particles with one shape.
The optimization scheme of the existing brake system rarely relates to the arrangement mode of friction particles in a brake pad structure. The friction speed born by the outermost friction particles on the brake disc is maximum, so that the outermost friction particles are impacted with higher strength, interface abrasion and crack initiation are aggravated, a large-area severe abrasion area is caused, the continuous and violent vibration phenomenon of the interface can be caused by the high-strength impact, and high-frequency and high-strength squeal noise is excited. The number of particles arranged in the outermost layer is also high, resulting in the largest contact area of the region with the brake disc. Compared with the inner layer, the grinding time is greatly prolonged. If non-circular-arc-shaped friction particles are still adopted, the abrasion characteristics and contact pressure distribution of the surfaces of the friction particles are greatly influenced, the abrasion is aggravated, serious stress concentration is caused, high-frequency squeal noise is generated in the braking process of a train, the local high-temperature phenomenon of the surfaces of the friction particles is caused, the operation precision and reliability of an interface are seriously influenced, the service life of a brake pad is shortened, and the stability of a braking system is reduced.
On the other hand, the influence of the arrangement mode of the switching ends of the brake pad structure on the braking performance is not considered. While the characteristics of the cut-in end are actually closely related to the characteristics of the braking interface. In the braking process, the cut-in area of the brake pad bears the impact force with the maximum energy level, the surface topography characteristics of friction particles in the area are damaged to the greatest extent, interface abrasion and crack initiation are aggravated, abrasive dust accumulation, adhesion tearing and other phenomena are caused, a large-area serious abrasion area appears, the severe fluctuation of interface friction force can be caused by the huge impact force, the interface continuous and severe vibration phenomenon is caused, and high-frequency and high-strength braking squeal noise is radiated. Meanwhile, serious stress concentration is generated, high-intensity vibration noise is generated in a braking system, and meanwhile, the local high temperature phenomenon on the surface of the friction particles is caused, so that the safety and the reliability of the braking process are greatly influenced.
As the speed grade of the train is continuously improved, the braking energy is relatively large. The heat load generated at the friction interface during braking is larger, and the conventional brake pad friction particle fixing mode generally adopts rivet fixing connection and high-temperature pressing. When braking, the brake pad is easy to have unbalanced load distribution, so that the friction interface vibrates, the effective contact area is greatly reduced, the heat load is intensively distributed on the contacted surface, and the service life of the brake pad is shortened. Recently, a brake pad structure with an adjuster has been proposed, such as an adjuster (application publication No. CN101982668A) for a train brake pad invented by temma scientific and technical industries ltd, of changzhou city, which proposes a quincunx adjuster capable of integrally fixing three friction particles; the foreign patent (application number: US20190024735A1) proposes a peanut-shaped conditioner that can fix two abrasive particles as a whole. The brake pad of the regulator automatically regulates all friction particles to the same plane under the braking condition of high speed and high pressure so as to improve the contact area during work. However, such regulators are complicated in structure, inconvenient for flexible installation and arrangement of friction particles, and relatively poor in vibration and noise reduction and stress distribution.
The above discussion illustrates the problems with current braking systems that can cause severe noise pollution during train braking, which can harm the physical and mental health of passengers and residents along the way. And the service life of the brake pad is greatly shortened, even braking accidents can be caused, and the running efficiency and the economic benefit of the train are reduced. In a word, the prior art has certain defects in the safety, reliability and comfort of train braking. Therefore, the research and development of the novel high-speed rail brake pad has important engineering application significance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-speed train brake pad for optimizing friction particle combination and installation mode, which aims to: the idea of combining friction particles of different shapes and materials is provided, the advantages of the friction particles of different shapes are organically combined, the braking reliability and safety are ensured, the service life of the brake pad is prolonged, and therefore the production and operation cost is reduced.
The technical scheme adopted by the invention is as follows:
the utility model provides an optimize high-speed train brake lining of friction particle combination and mounting means, includes brake disc, brake lining structure and loading device, loading device and brake lining structural connection, brake lining structure and brake disc cooperation, brake lining structure includes brake lining backplate, be provided with several friction particle on the brake lining backplate, several friction particle has two kind at least shapes.
After the technical scheme is adopted, the brake pad friction particle combination structure is optimized, and the advantages of friction particles in different shapes can be organically combined by adopting the friction particle combinations in different shapes.
Preferably, the friction particles include polygonal friction particles and circular friction particles. Through the combination of the round friction particles and the polygonal friction particles, the safety and the reliability of train braking can be ensured, and the noise pollution of the environment is reduced.
Preferably, the circular friction particles are located at the outer side and/or both ends of the brake pad backing plate, and the polygonal friction particles are located at the inner side and the middle part of the brake pad backing plate.
After the optimal scheme is adopted, round friction particles are arranged at the two ends of the brake pad and/or on the outermost layer of the brake pad with the relatively high grinding relative speed, the occurrence of the phenomenon of serious abrasion in the braking process can be reduced as much as possible, abrasive dust accumulation is avoided, the stability of the system in the braking process is improved, a good vibration and noise reduction effect is achieved, and the service life of the brake pad is further prolonged. Set up hexagon friction particle at the brake lining middle part that strikes comparatively mitigateing, it can avoid stress concentration to a certain extent, guarantees that friction interface closely laminates, promotes braking efficiency, reduces braking distance, improves high-speed train's security and reliability further, and then guarantees passenger's journey safety.
Preferably, the friction particles are composed of at least one powder metallurgy or at least one composite material.
After the optimal scheme is adopted, the performances of different materials can be comprehensively utilized, and the integral uniformity and wear resistance of the brake pad are improved.
Preferably, the wear resistance of the friction particles decreases from the two ends of the brake pad backing plate to the middle.
After the optimal scheme is adopted, the advantages and properties of different materials can be comprehensively utilized, the eccentric wear phenomenon of the brake pad in the operation process can be effectively improved, and the service life of the brake pad is prolonged.
Preferably, the brake pad back plate is provided with a mounting hole, two ends of the mounting hole are provided with a first counter bore and a second counter bore, a guide shaft is arranged in the mounting hole, one end of the guide shaft is connected with a friction particle supporting body, the friction particle supporting body is connected with friction particles, the other end of the guide shaft is connected with a spring clamping ring, the spring clamping ring is located in the second counter bore, and a damping supporting pad is arranged in the first counter bore.
After adopting this preferred scheme, the stress concentration phenomenon that friction particle can be avoided in the setting of damping supporting pad, reduces frictional vibration to play the effect of making an uproar that falls in the damping.
The guide shaft is of a columnar structure, the cross section of the guide shaft is non-circular, and the shape of the mounting hole is matched with that of the guide shaft.
After the optimal scheme is adopted, the rotation prevention mode of the friction particles is optimized, the shape of the guide post is optimized from a cylindrical shape to a non-cylindrical shape (such as a prism shape, an elliptic cylinder shape and the like) unlike the shapes of the guide shaft and the installation hole in the existing installation structure, and the shape of the installation hole is matched with the shape of the guide shaft, so that the rotation of the friction particles can be prevented. Compared with the existing anti-rotation means, such as the arrangement of an anti-rotation block or the arrangement of the installation position of friction particles, the anti-rotation device has the advantages that the structure is simpler, the processing difficulty and the assembly difficulty are reduced, and the enterprise benefit is further improved.
Preferably, the damping supporting pad comprises an upper layer and a lower layer, the lower layer is a metal damping gasket, the upper layer is a heat insulation layer, and the heat insulation layer is made of a heat insulation material.
After the optimal scheme is adopted, the heat insulation layer can reduce the influence of frictional heat on the metal damping washer, the service life of the metal damping washer is ensured, the contact state of friction particles and a brake disc can be adjusted through the deformation of the metal damping washer in the braking process, the stress concentration phenomenon on the surface of the friction particles can be avoided, the thermal distribution of a braking interface is improved, the frictional vibration intensity of a system is reduced, and therefore the effects of improving the braking safety and reducing vibration and noise are achieved.
Preferably, the friction particles are integrated with the friction particle support and the guide shaft by high-temperature sintering.
After the optimal scheme is adopted, the friction particles are connected with the friction particle support body and the guide shaft more firmly, the compression strength and the shear strength are higher, the friction particles, the friction particle support body and the guide shaft can be prevented from being damaged in the braking process, and the service life of a braking system is prolonged.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the brake pad friction particle composite structure is optimized, a plurality of friction particle combinations in different shapes are adopted, the advantages of the friction particles in different shapes can be organically combined, the brake system of the high-speed train can guarantee brake reliability and safety, the vibration reduction and noise reduction capabilities are achieved, the noise pollution of the environment is reduced, comfortable riding experience is brought to passengers, the service life of the brake pad can be prolonged, the production and operation cost is reduced, and higher operation efficiency is brought to the national transportation industry.
2. The friction particles comprise polygonal friction particles and circular friction particles, the circular friction particles have better vibration and noise reduction effects than the polygonal friction particles, but the polygonal friction particles are better than the circular friction particles in stress distribution and braking efficiency. The round friction particles are arranged at the two ends of the brake pad and/or on the outermost layer of the brake pad with high opposite-grinding relative speed, so that the phenomenon of serious abrasion in the braking process can be reduced as much as possible, the stability of the system in the braking process is improved, a good vibration and noise reduction effect is achieved, and the service life of the brake pad is further prolonged. Set up hexagon friction particle at the brake lining middle part that strikes comparatively mitigateing, it can avoid stress concentration to a certain extent, guarantees that friction interface closely laminates, promotes braking efficiency, reduces braking distance, improves high-speed train's security and reliability further, and then guarantees passenger's journey safety.
3. The performance of different materials can be comprehensively utilized, and the integral contact uniformity and wear resistance of the brake pad can be improved. The wear resistance of the friction particles is gradually reduced from the two ends to the middle of the brake pad back plate, the eccentric wear phenomenon of the brake pad in the operation process can be effectively improved by using the wear resistance characteristics of different materials, and the service life of the brake pad is prolonged.
4. The damping supporting pad can avoid the stress concentration phenomenon of friction particles and reduce friction vibration, thereby playing the role of vibration reduction and noise reduction.
5. The damping supporting pad comprises a metal damping gasket and a heat insulating layer, the heat insulating layer can reduce the influence of frictional heat on the metal damping gasket, the service life of the metal damping gasket is ensured, the contact state of friction particles and a brake disc can be adjusted through the deformation of the metal damping gasket in the braking process, the stress concentration phenomenon on the surface of the friction particles can be avoided, the heat distribution of a braking interface is improved, the frictional vibration intensity of a system is reduced, and therefore the effects of improving the braking safety and reducing vibration and noise are achieved.
6. The anti-rotation mode of the friction particles is optimized, the shape of the guide column is optimized to be non-cylindrical (such as prism shape, elliptic cylinder shape and the like) from cylindrical shape unlike the shape of the guide shaft and the installation hole in the existing installation structure, and the shape of the installation hole is matched with the shape of the guide shaft, so that the friction particles can be prevented from rotating.
7. The friction particles, the friction particle supporting body and the guide shaft are sintered into a whole at high temperature, so that the friction particles, the friction particle supporting body and the guide shaft are connected more firmly, the compression strength and the shear strength are higher, the friction particles, the friction particle supporting body and the guide shaft can be prevented from being damaged in the braking process, and the service life of a braking system is prolonged.
Drawings
The invention will be described by way of the following examples and with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the arrangement of friction particles of the brake pad of the present invention;
FIG. 3 is a schematic view of another arrangement of the friction particles of the brake pad of the present invention;
FIG. 4 is a schematic structural view of a friction particle according to the present invention;
FIG. 5 is a schematic view of the construction of the guide shaft according to the present invention;
FIG. 6 is a rear elevational view of the brake pad backing plate of the present invention;
FIG. 7 is a partial cross-sectional view taken along section A-A of FIG. 6;
FIG. 8 is a schematic view of a configuration of a damped support pad;
FIG. 9 is a schematic view of the construction of the insulation layer;
FIG. 10 is a schematic view of a metal damping washer;
fig. 11 is a contact pressure distribution diagram of the present invention.
The brake comprises a brake disc 1, a brake pad backing plate 2, a loading connecting rod 3, a loading buffer block 4, a loading connecting frame 5, a loading thrust frame 6, friction particles 7, circular friction particles 701, polygonal friction particles 702, a friction particle support body 8, a guide shaft 9, a spring collar 10, a mounting hole 11, a first counter bore 12, a second counter bore 13, a metal damping washer 14 and a heat insulation layer 15.
Detailed Description
All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of mutually exclusive features and/or steps, and are not limited to the embodiments described below.
The present invention will be described in detail with reference to fig. 1 to 11.
Example one
The utility model provides an optimize high-speed train brake lining of friction particle combination and mounting means, includes brake disc 1, brake lining structure and loading device, loading device and brake lining structural connection, brake lining structure and the cooperation of brake disc 1, brake lining structure includes brake lining backplate 2, be provided with several friction particle 7 on the brake lining backplate 2, several friction particle 7 has two kinds and more than the shape. In the embodiment, the brake pad back plate 2 is bilaterally symmetrical in structure, is arc-like in shape and is formed by punching a steel material.
The friction particles 7 include polygonal friction particles 702 and circular friction particles 701. In this embodiment, the polygonal friction particles 702 are regular hexagonal friction particles.
Research shows that the performance of the hexagonal friction particles in vibration reduction and noise reduction is obviously inferior to that of the circular friction particles, but the hexagonal friction particles are superior to the circular friction particles in stress distribution and braking efficiency. As shown in fig. 3, in the present embodiment, the number of the friction particles 7 is eighteen, eight of which are circular friction particles 701, and the remaining ten of which are regular hexagonal friction particles. The eight round friction particles 701 are arranged at the cut-in ends (namely two ends) of the brake pad back plate 2 with large relative speed and impact, and four are arranged at each end; ten regular hexagonal friction particles are arranged in the inner layer and the middle part of the brake pad back plate 2 with smaller relative speed and impact. The round friction particles 701 are arranged at the cut-in end of the brake pad or on the outermost layer of the brake pad with high opposite-grinding relative speed, so that the phenomenon of serious abrasion in the braking process can be reduced as much as possible, abrasive dust accumulation is avoided, the stability of the system in the braking process is improved, a good vibration and noise reduction effect is achieved, and the service life of the brake pad is further prolonged. Set up regular hexagon friction particle at the inboard and middle part of the brake lining that strike comparatively mitigatees, can avoid stress concentration to a certain extent, guarantee that friction interface closely laminates, promote braking efficiency, reduce braking distance, improve high-speed train's security and reliability further, and then guarantee passenger's journey safety.
In the present embodiment, the friction particles having two shapes, namely regular hexagon and round, may be combined by using friction particles having other shapes (for example, regular triangle, regular quadrangle, regular pentagon, regular octagon, ellipse, quincunx, etc.) in practical application. The distribution of the amounts of two or more types of friction particles can also be adjusted according to the requirements of the working conditions.
The friction particles are composed of at least one powder metallurgy or at least one composite material. According to actual use needs, different composition materials can be selected and used, so that different advantageous properties of different materials are comprehensively utilized.
The wear resistance of the friction particles 7 decreases from the two ends of the brake pad backing plate 2 to the middle. The friction particles with relatively strong wear resistance are arranged in the cut-in areas (namely two ends) of the brake pad back plate 2, and the friction particles with relatively weak wear resistance are arranged in the middle of the brake pad back plate, so that the eccentric wear phenomenon of the brake pad in the operation process can be effectively improved by utilizing the wear resistance of different materials, and the service life of the brake pad is prolonged.
The brake pad back plate 2 is provided with a mounting hole 11 for mounting the friction particles 7, a first counter bore 12 and a second counter bore 13 are arranged at two ends of the mounting hole 11, and a guide shaft 9 is arranged in the mounting hole 11. The guide shaft 9 is of a columnar structure, the cross section of the guide shaft 9 can be in any shape other than a circle, and the shape of the mounting hole 11 is matched with that of the guide shaft 9. In this embodiment, the cross-sectional shape of the guide shaft 9 is rectangular or elliptical. One end of the guide shaft 9 is connected with a friction particle support body 8, and the other end of the guide shaft 9 is connected with a spring collar 10. The friction particle support 8 is connected with the friction particles 7 and is used for supporting the friction particles 7. The spring collar 10 is located in a second counterbore 13 for securing the guide shaft 9. The first counter bore 12 is provided with a damping support pad for resisting the pressure transmitted by the friction particles 7 together with the friction particle support body 8.
In this embodiment, the friction particles 7 are made of a copper-based powder metallurgy material, and the spring collar 3 is made of a spring steel material. The friction particles 7, the friction particle support body 8 and the guide shaft 9 are integrated through high-temperature sintering.
The damping supporting pad is composed of an upper layer and a lower layer, the upper layer is a heat insulation layer 15, the lower layer is a metal damping gasket 14, and the heat insulation layer 15 is used for reducing the influence of friction heat on the metal damping gasket 14 and ensuring the service life of the metal damping gasket 14. In the braking process, the contact state of the friction particles 7 and the brake disc 1 is adjusted through the deformation of the metal damping washer 14, so that the stress concentration phenomenon on the surfaces of the friction particles 7 can be avoided, the heat distribution of a braking interface is improved, and the friction vibration intensity of a system is reduced, thereby achieving the effects of improving the braking safety and reducing vibration and noise. The thermal insulation layer 15 is made of a thermal insulation material.
The loading device comprises a loading connecting frame 5 and a loading thrust frame 6, the loading thrust frame 6 is hinged with the loading connecting frame 5, and the loading thrust frame 6 can rotate around the loading connecting frame 5. The loading thrust frame 6 is connected with a loading connecting rod 3, the loading connecting rod 3 is connected with a loading buffer block 4, and the loading buffer block 4 is connected with the brake pad back plate 2. When braking, the loading reasoning frame 6 is controlled to rotate around the loading connecting frame 5, so that the brake pad back plate 2 clamps the brake disc 1, and the purpose of braking is achieved.
The interface contact pressure distribution between the brake disc and the brake pad has an important influence on the stability of the brake system, and the unstable vibration of the system is often caused by uneven pressure distribution. Uniformity of contact pressure distribution is often used to evaluate an important indicator of brake system performance. The more uniform the contact pressure distribution, the better the braking performance of the system.
Two brake pads are analyzed by adopting finite elements in the embodiment, the combined brake pad formed by combining the hexagonal friction particles and the circular friction particles is used as a test group, and the brake pad formed by the hexagonal friction particles is used as a comparison group. The contact pressure distribution is shown in fig. 11: when the brake disc is static, the contact pressures of the two brake pads are approximately symmetrically distributed, and the contact pressures of the two brake pads are not greatly different. When the brake disc starts to rotate, the contact pressure distribution of the brake pad surface is no longer symmetrical. Due to the friction, the maximum contact pressure becomes large, which occurs at the contact front edge of the brake pad. For a corporation brake pad, the maximum contact pressure of the contact surfaces is about 14 MPa. For a hexagonal brake pad, the maximum contact pressure of the contact surface is about 18 MPa. From the above data, it can be seen that the contact pressure of the composite brake pads is significantly less than that of the brake pads of hexagonal friction particles, and therefore, the contact pressure distribution of the composite brake pads is more uniform. Therefore, the combined brake pad has better braking performance.
Example two
The present embodiment is basically the same as the first embodiment, except that:
as shown in fig. 2, in the present embodiment, the number of the friction particles 7 is eighteen, ten of them are circular friction particles 701, and the remaining eight are regular hexagonal friction particles 702. The ten round friction particles 701 are arranged on the outer layer and the cut-in end of the brake pad back plate 2 with large relative speed and impact; eight regular hexagonal friction particles 702 are arranged in the inner layer and the middle part of the brake pad back plate 2 with small relative speed and impact. As the passenger flow in the city is large, the passenger riding experience can be seriously influenced by overlarge brake noise, and higher requirements on vibration reduction and noise reduction of a brake system are provided by a high-speed train running in the city. In addition, when a high-speed train running in a city brakes, the external environment is friendly, so that the combination mode in the embodiment is adopted in the aspect of the quantity distribution of the two friction particles. The technical scheme can organically combine the advantages of the friction particles with different shapes, ensure the braking reliability and safety of the braking system of the high-speed train, reduce vibration and noise as much as possible, reduce the noise pollution of the environment and bring comfortable riding experience for passengers.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (9)
1. The utility model provides a high-speed train brake pad of optimizing friction particle combination and mounting means which characterized in that: including brake disc (1), brake lining structure and loading device, loading device and brake lining structural connection, brake lining structure and brake disc (1) cooperation, brake lining structure includes brake lining backplate (2), be provided with several friction particle (7) on brake lining backplate (2), several friction particle (7) have two kind at least shapes.
2. A high speed train brake lining for optimizing friction particle assembly and installation according to claim 1, wherein said friction particles (7) comprise polygonal friction particles (702) and circular friction particles (701).
3. The brake pad for high-speed trains with optimized friction particle combination and installation manner according to claim 2, wherein the circular friction particles (701) are located at the outer side and/or both ends of the brake pad back plate (2), and the polygonal friction particles (702) are located at the inner side and the middle part of the brake pad back plate (2).
4. A high speed train brake lining for optimizing friction particle assembly and installation according to claim 1, wherein said friction particles (7) are composed of at least one powder metallurgy or at least one composite material.
5. A high speed train brake lining for optimizing friction particle assembly and installation according to claim 1, wherein the wear resistance of said friction particles (7) decreases from the ends of the brake lining backing plate (2) to the middle.
6. The high-speed train brake pad for optimizing friction particle combination and installation manner according to claim 1, wherein the brake pad back plate (2) is provided with an installation hole (11), both ends of the installation hole (11) are provided with a first counter bore (12) and a second counter bore (13), a guide shaft (9) is arranged in the installation hole (11), one end of the guide shaft (9) is connected with a friction particle support body (8), the friction particle support body (8) is connected with friction particles (7), the other end of the guide shaft (9) is connected with a spring collar (10), the spring collar (10) is located in the second counter bore (13), and the first counter bore (12) is provided with a damping support pad.
7. The brake pad for high-speed trains with optimized friction particle combination and installation manner as claimed in claim 6, wherein the guide shaft (9) is of a cylindrical structure, the cross-sectional shape of the guide shaft (9) is non-circular, and the shape of the installation hole (11) is matched with that of the guide shaft (9).
8. The high-speed train brake pad for optimizing friction particle combination and installation according to claim 6, wherein the damping support pad comprises an upper layer and a lower layer, the lower layer is a metal damping washer (14), the upper layer is a thermal insulation layer (15), and the thermal insulation layer (15) is made of a thermal insulation material.
9. The brake pad for high-speed trains with optimized friction particle combination and installation manner according to claim 6, wherein the friction particles (7) are sintered with the friction particle support body (8) and the guide shaft (9) into a whole at high temperature.
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| CN202010158203.9A CN111396474B (en) | 2020-03-09 | 2020-03-09 | High-speed train brake pad with optimized friction particle combination and installation mode |
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| CN202010158203.9A CN111396474B (en) | 2020-03-09 | 2020-03-09 | High-speed train brake pad with optimized friction particle combination and installation mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113048172A (en) * | 2021-03-25 | 2021-06-29 | 博深股份有限公司 | Motor train unit brake lining with large gap |
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| CN113048172A (en) * | 2021-03-25 | 2021-06-29 | 博深股份有限公司 | Motor train unit brake lining with large gap |
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