CN113357295A - Ventilated type ribbed brake disc with axisymmetric periodic porous material - Google Patents
Ventilated type ribbed brake disc with axisymmetric periodic porous material Download PDFInfo
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- CN113357295A CN113357295A CN202110534200.5A CN202110534200A CN113357295A CN 113357295 A CN113357295 A CN 113357295A CN 202110534200 A CN202110534200 A CN 202110534200A CN 113357295 A CN113357295 A CN 113357295A
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- friction disc
- truss
- friction
- disc
- rotor cap
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- 230000000737 periodic effect Effects 0.000 title claims abstract description 10
- 239000011148 porous material Substances 0.000 title abstract description 8
- 238000009423 ventilation Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 6
- 230000001413 cellular effect Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 29
- 230000017525 heat dissipation Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004227 thermal cracking Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Classifications
-
- 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
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/128—Discs; Drums for disc brakes characterised by means for cooling
-
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a ventilated type ribbed brake disc with axisymmetric periodic porous materials, which comprises a rotor cap, a core body and two friction discs, wherein the rotor cap is made of a porous material; the two friction disks are arranged on the rotor cap in parallel and are coaxial with the rotor cap; the core body is arranged between the two friction disks and comprises N fins and N supporting flow guide pieces; the N fins are uniformly arranged between the first friction disc and the second friction disc in the circumferential direction, and space between the first friction disc and the second friction disc is divided into N ventilation channels; the N supporting flow guide pieces are arranged in the N ventilation channels in a one-to-one correspondence mode, are identical in structure and are symmetrical about the axis of the rotor cap, and a through space is provided for cooling air flow when the cooling air flow passes between the two friction disks. Compared with the prior art, the invention has more excellent cooling efficiency and further improves the braking and safety performance of the brake disc.
Description
Technical Field
The invention relates to the field of braking, in particular to a ventilated type ribbed brake disc with axisymmetric periodic porous materials.
Background
Light passenger vehicles and heavy goods vehicles rely on the braking system to dissipate the mechanical energy of the vehicle to reduce or maintain vehicle speed. The brake disc is one of the components of a braking system and rotates during operation, and the interface between the brake pad and the brake disc provides a frictional contact area for dissipating mechanical energy of the vehicle. When a driver of the vehicle applies pressure to the brake pedal, the brake pad is pressed on the friction surface of the rotor through the brake caliper to provide clamping force for the brake disc, so that the effect of friction braking is achieved, and the vehicle speed is controlled. The braking process dissipates the mechanical energy of the vehicle through friction and converts the mechanical energy into heat energy, so that the temperature of the braking system is increased. If the braking load is high, the brake disc temperature may be too high. Thus, a brake disc is a device that needs to withstand large braking, clamping and thermal stresses. The performance of a disc brake is determined by the heat dissipation efficiency, and it is necessary to prevent an excessively high operating temperature, ensure uniform heat, minimize a temperature gradient in a material of a brake disc, and minimize noise and vibration during braking.
Excessive temperatures create problems with braking performance, such as brake failure due to excessive brake disc temperatures, increased brake pad and disc wear, and excessive temperature gradients within the rotor material, leading to thermal distortion, thermal cracking, and vibration. Aiming at the problems, the invention provides the ventilated brake disc which can improve the heat dissipation capacity of the brake and reduce the working temperature of the rotor.
The ventilated brake disc consists of a pair of annular friction discs which are arranged side by side and coaxially rotate, and the disc surfaces on the outer sides of the friction discs are friction surfaces. The two annular friction disks have a parallel spacing providing a unique vent passage for cooling air to flow through the interior space between the friction disks. In this channel, a plurality of internal elements or spaces (span-wise internal elements or spaces), such as struts (pilars), ribs or a combination of both, are generally distributed radially, providing a certain compressive strength to withstand the clamping forces required by the brake disc during braking and to maintain the ventilation volume. In addition, the inner element has the effect of a centrifugal pump, drawing cooling air flow through the core volume between the annular friction disks. The prior art [1-10] proposes various internal arrangements of vent passages to improve the heat dissipation performance of the brake disc. For example, the prior art [1-5] shows different fin geometries with the objective of maximizing the air flow rate pumped by the rotor to further improve the convective heat transfer cooling efficiency of the rotor. However, the brake discs in the existing market all have the disadvantages of poor cooling effect and non-uniform internal temperature distribution, so that the existing brake discs generate overhigh local thermal stress, which buries potential safety hazards for the abrasion and the breakage of the brake discs and the shorter service life.
The prior art is as follows:
1. rotor alternating fin design _ US6193023
2. Ventilation brake disc with bent cooling air pipe inside _ US7100748
Venturi nozzle pneumatic vent design _ US20090272609
4. High cooling air flow brake rotor _ US5492205 (Zhang _ 1996)
5. Brake rotor _ US6260669 with flow guide structure
6. Brake rotor _ CN106050993a with inclined posts
7. Disc brake with cooling rod _ US3899054
8. Rotor _ US6216829 with tubular ventilation tube
9. Disc brake rotor with tilting rib geometry _ US20100206674
10. Ventilated disc brake band for disc brake _ US 20060243546.
Disclosure of Invention
The invention aims to solve the technical problem of providing a ventilated ribbed brake disc with axisymmetric periodic porous materials aiming at the defects in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a ventilated ribbed brake disc with axisymmetric periodic cellular material, comprising a rotor cap, a first friction disc, a second friction disc, and a core; the first friction disc and the second friction disc are arranged on the rotor cap in parallel and are coaxial with the rotor cap; the core is disposed between the first friction disk and the second friction disk;
the core body comprises N fins and N supporting flow guide pieces, wherein N is a natural number more than or equal to 3;
the fins are strip-shaped; the N fins are uniformly arranged between the first friction disc and the second friction disc in the circumferential direction and point to the axis of the rotor cap, the side walls of the fins are fixedly connected with the first friction disc and the second friction disc respectively, and the space between the first friction disc and the second friction disc is divided into N ventilation channels;
the N supporting flow guide pieces are correspondingly arranged in the N ventilation channels one by one, have the same structure and are symmetrical about the axis of the rotor cap;
the supporting flow guide part is formed by a flow guide cell array; the flow guide cellular comprises first to third rod pieces, wherein the first to third rod pieces are intersected and fixedly connected at the midpoints of the first to third rod pieces, and included angles between the adjacent rod pieces are equal, so that the first to third rod pieces form a first truss and a second truss which are symmetrical about the midpoint of the first rod piece; the first truss and the second truss are in a regular triangular pyramid shape, the vertexes of the first truss and the second truss are located at the middle point of the first rod piece, three end parts of the first truss are fixedly connected with the first friction disc, and three end parts of the second truss are fixedly connected with the second friction disc;
the guide cells of the support guide member are circumferentially and radially arrayed by taking the axis of the rotor cap as the center, the end parts of the first truss and the second truss of the adjacent guide cells are correspondingly connected, the diameters of the first rod piece to the third rod piece of each guide cell in the circumferential array are the same, and the diameters of the first rod piece to the third rod piece of each guide cell in the radial array are gradually increased from inside to outside.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the invention discloses a ventilated type finned brake disc with axisymmetric periodic porous materials, which reduces the working temperature by enhancing heat dissipation and can regulate and control the temperature distribution in a rotor so as to reduce the temperature gradient.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a perspective view of the present invention;
FIG. 3 is a partial cross-sectional view of the present invention;
FIG. 4 is a schematic structural diagram of a guide cell according to the present invention;
fig. 5 is a schematic diagram comparing the cooling rate of the ventilated brake disc of the present invention with that of the prior art (cooling rate: present invention = -0.0019, existing market brake disc = -0.0013).
In the figure, 1 is a rotor cap, 2 is a first friction disk, 3 is a second friction disk, 4 is a core body, 5 is a rib, 6 is a supporting flow guide member, 7 is an air duct, 8 is a flow guide cellular, 9 is a first rod piece, 10 is a second rod piece, 11 is a third rod piece, 12 is a first truss, and 13 is a second truss.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in fig. 1, a ventilated ribbed brake disc having an axisymmetric periodic porous material includes a rotor cap, a first friction disc, a second friction disc, and a core body; the first friction disc and the second friction disc are arranged on the rotor cap in parallel and are coaxial with the rotor cap; the core is disposed between the first friction disk and the second friction disk;
as shown in fig. 2 and 3, the core body comprises N fins and N supporting flow guide members, where N is a natural number greater than or equal to 3;
the fins are strip-shaped; the N fins are uniformly arranged between the first friction disc and the second friction disc in the circumferential direction and point to the axis of the rotor cap, the side walls of the fins are fixedly connected with the first friction disc and the second friction disc respectively, and the space between the first friction disc and the second friction disc is divided into N ventilation channels;
the N supporting flow guide pieces are correspondingly arranged in the N ventilation channels one by one, have the same structure and are symmetrical about the axis of the rotor cap;
the supporting flow guide part is formed by a flow guide cell array; as shown in fig. 4, the guide cell includes first to third bars, wherein the first to third bars are connected to each other at their midpoints, and the included angles between the adjacent bars are equal, so that the first to third bars form a first truss and a second truss symmetric about the midpoint of the first bar; the first truss and the second truss are in a regular triangular pyramid shape, the vertexes of the first truss and the second truss are located at the middle point of the first rod piece, three end parts of the first truss are fixedly connected with the first friction disc, and three end parts of the second truss are fixedly connected with the second friction disc;
the guide cells of the support guide member are circumferentially and radially arrayed by taking the axis of the rotor cap as the center, the end parts of the first truss and the second truss of the adjacent guide cells are correspondingly connected, the diameters of the first rod piece to the third rod piece of each guide cell in the circumferential array are the same, and the diameters of the first rod piece to the third rod piece of each guide cell in the radial array are gradually increased from inside to outside.
Unlike the prior art, the individual flow guide cells are arranged periodically in an axisymmetric manner. The diameters of the first rod piece to the third rod piece of the guide cell in the radial array are gradually increased from inside to outside, and the sizes of the bottom triangles of the first truss and the second truss of the guide cell are gradually increased along the radial direction, so that the guide cell can adapt to an annular friction disc which is continuously expanded, and the axial symmetric distribution is kept.
The guide cells provide a through space for cooling air flow so as to enhance the heat dissipation of the rotor. In addition, the rod diameter varies radially outward to ensure better heat dissipation characteristics. The volume occupied by each guide cell changes with the diameter of the rod. In addition, the diameter of the rods in a guide cell can also vary along the axial direction of the individual rods. The diameter of the rod piece in the ventilation channel is changed, so that better airflow distribution and momentum change in the ventilation channel can be realized, and the heat dissipation and heat uniformity in the ventilation channel are optimized.
When the first friction disc and the second friction disc are subjected to friction braking force, compression clamping force and thermal stress, the ribs can provide additional support for improving the compressive strength of materials, and meanwhile, the ribs arranged in the radial direction also improve the pumping efficiency of the supporting flow guide member in the air duct on air flow.
The manner in which the core is integrated into the friction disk includes, but is not limited to, the following manufacturing methods: monolithic molding, monolithic gray cast iron casting, ceramic composite matrix, carbon fiber reinforced carbon (cfrp) and C/CSiC. A possible embodiment of the supporting baffle is to integrate the self-supporting structure into the ventilation channel using cast manufacturing.
The axisymmetrical arrangement of the inner core, the supporting air guide and the ribs ensure that the brake disc is bidirectional-the cooling characteristic is independent of the direction of rotation. The brake rotors can be connected (engaged to) on both the left and right sides of the vehicle.
The invention improves the cooling performance by the following physical mechanism:
1. the surface area of the core body of the supporting flow guide part is increased, and the heat transfer is increased; the heat dissipation performance of the brake disc is improved.
2. A rod member of a small diameter supporting the guide member; reducing the size of the wake increases the efficiency of the utilization of the available heat transfer surface area. The small and numerous rods increase the overall efficiency of heat dissipation in the core area.
3. Flow mixing is enhanced because the three-dimensional bar geometry creates a vortex flow structure, such as horseshoe-shaped, arched vortices (horesehoe, arch-shaped vortices), which are known to facilitate convective heat transfer characteristics.
4. Controlling the occupied volume of the guide flow cells in the axial direction, the circumferential direction and the radial direction; by varying the diameter of the rod, e.g., by varying the volume occupied by the periodic unit material in the radial direction, the flow area of the cooling air flow is varied and the momentum of the air flow is allowed to be controlled in the radial direction. The preferred selection of a rod of varying diameter results in superior thermal uniformity and thus better thermal control. The above examples do not limit the scope of the present invention, and one of the core innovation points of the present invention is: an axially varying open volume is utilized to ensure uniform heat transfer between the inner and outer annular disks.
5. The ribs extend radially along the whole or part of the annular friction disc, enhancing the pumping effect of the ventilated brake disc, more than what can be achieved by the supporting deflector itself. The cooling air flow rate through the gaps between the annular discs is increased, and the convection cooling effect is enhanced, so that the working temperature of the brake disc is reduced.
The present invention also enables to improve NHV (noise, harshness, vibration) performance:
1. the core body is connected with the first friction disc and the second friction disc through a plurality of contact nodes, and the increased contact nodes can dissipate mechanical energy, so that vibration noise of the brake discs caused by friction can be inhibited.
2. Compared with the existing brake disc, the axial symmetry arrangement of the guide cells improves the rigidity of the rotor, increases the resonance frequency of the rotor, and is beneficial to reducing the brake noise generated during braking.
Compared with the prior art, the invention can improve the cooling capacity, reduce the working temperature of the brake disc, and is beneficial to reducing the brake failure and the abrasion of the brake disc and the brake pad; the improved thermal uniformity reduces thermal distortion, thermal cracking, and thermoelastic instability, all of which are important factors in producing brake failure; in addition, the invention also improves the structural damping and reduces the brake noise.
In order to verify the cooling effect of the present invention, a field loading test (tracking testing) was performed, and the cooling performance of the present invention was improved compared to the brake disc on the existing market. The cooling rate was obtained by calculating the ratio of the slope (° C) of the linear curve Log (T-Ta) to time (seconds), and the heat dissipation performance of the present invention and the conventional ventilated brake disc installed on a commercial vehicle, which is currently known, was measured and compared, as shown in fig. 5. The linear plot shows that the dissipated thermal energy of the brake disc is dominated by the convective heat transfer mode, complying with newtonian cooling laws. The more sloped plot in the figure indicates greater convective cooling. The results of the on-site loading test showed that the rotor was comparable to the currently known rotor (0.006 seconds)-1) The present invention achieves a greater cooling rate (i.e., 0.008 seconds)-1）。
To evaluate comparative cooling performance, the same tracking test method was applied to the brake discs of the present invention and currently on the market, the test method being described as follows: the test was carried out on an oval track by dragging a commercial vehicle equipped with a ventilated brake disc with a towing vehicle (secondary vehicle) at a constant speed of 40 km/h. The traction rod pulling the commercial vehicle is provided with a load cell for measuring the traction force, and the load cell can measure the braking force when the braking system is engaged. In the brake cooling performance test, the brake power is calculated by measuring and controlling the product of the brake speed and the brake force. The left and right front vented brake discs are frictionally heated by the braking system of the vehicle. The present invention has the same input braking power as the brake discs known so far. When the brake disc is heated, the surface temperature of the annular friction disc inside the left and right brake discs is measured with a non-contact infrared thermometer that has been calibrated. Braking is continued so that the brake disc frictionally heats up until the brake pad surface temperature reaches a steady state. Subsequently, the brake system is disengaged and the braking power is zero. This completes a cooling cycle and records the change in brake disc surface temperature over time for use in calculating the cooling rate parameter.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A ventilated ribbed brake disc with axisymmetric periodic cellular material, comprising a rotor cap, a first friction disc, a second friction disc, and a core; the first friction disc and the second friction disc are arranged on the rotor cap in parallel and are coaxial with the rotor cap; the core is disposed between a first friction disk and a second friction disk, characterized in that:
the core body comprises N fins and N supporting flow guide pieces, wherein N is a natural number more than or equal to 3;
the fins are strip-shaped; the N fins are uniformly arranged between the first friction disc and the second friction disc in the circumferential direction and point to the axis of the rotor cap, the side walls of the fins are fixedly connected with the first friction disc and the second friction disc respectively, and the space between the first friction disc and the second friction disc is divided into N ventilation channels;
the N supporting flow guide pieces are correspondingly arranged in the N ventilation channels one by one, have the same structure and are symmetrical about the axis of the rotor cap;
the supporting flow guide part is formed by a flow guide cell array; the flow guide cellular comprises first to third rod pieces, wherein the first to third rod pieces are intersected and fixedly connected at the midpoints of the first to third rod pieces, and included angles between the adjacent rod pieces are equal, so that the first to third rod pieces form a first truss and a second truss which are symmetrical about the midpoint of the first rod piece; the first truss and the second truss are in a regular triangular pyramid shape, the vertexes of the first truss and the second truss are located at the middle point of the first rod piece, three end parts of the first truss are fixedly connected with the first friction disc, and three end parts of the second truss are fixedly connected with the second friction disc;
the guide cells of the support guide member are circumferentially and radially arrayed by taking the axis of the rotor cap as the center, the end parts of the first truss and the second truss of the adjacent guide cells are correspondingly connected, the diameters of the first rod piece to the third rod piece of each guide cell in the circumferential array are the same, and the diameters of the first rod piece to the third rod piece of each guide cell in the radial array are gradually increased from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110534200.5A CN113357295A (en) | 2021-05-17 | 2021-05-17 | Ventilated type ribbed brake disc with axisymmetric periodic porous material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110534200.5A CN113357295A (en) | 2021-05-17 | 2021-05-17 | Ventilated type ribbed brake disc with axisymmetric periodic porous material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113357295A true CN113357295A (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110534200.5A Pending CN113357295A (en) | 2021-05-17 | 2021-05-17 | Ventilated type ribbed brake disc with axisymmetric periodic porous material |
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| CN (1) | CN113357295A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201335113Y (en) * | 2008-12-09 | 2009-10-28 | 北京纵横机电技术开发公司 | Brake disc device installed on shaft |
| CN104813057A (en) * | 2012-11-05 | 2015-07-29 | 约翰内斯堡金山大学 | Mechanical friction device including a porous core |
| US20200217378A1 (en) * | 2019-01-03 | 2020-07-09 | Ming Zhang | Air cooling of disc brake unit by longitudinal vortex generator |
| US20200224739A1 (en) * | 2019-01-11 | 2020-07-16 | Michael J. Kawecki | Three-dimensional printed disc brake rotor |
| CN111503186A (en) * | 2020-07-01 | 2020-08-07 | 莱州伟辰汽车配件有限公司 | Split type high-efficient heat dissipation type brake disc |
| CN112443604A (en) * | 2019-09-04 | 2021-03-05 | 广州汽车集团股份有限公司 | Interior ventilation formula brake disc |
-
2021
- 2021-05-17 CN CN202110534200.5A patent/CN113357295A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201335113Y (en) * | 2008-12-09 | 2009-10-28 | 北京纵横机电技术开发公司 | Brake disc device installed on shaft |
| CN104813057A (en) * | 2012-11-05 | 2015-07-29 | 约翰内斯堡金山大学 | Mechanical friction device including a porous core |
| US20200217378A1 (en) * | 2019-01-03 | 2020-07-09 | Ming Zhang | Air cooling of disc brake unit by longitudinal vortex generator |
| US20200224739A1 (en) * | 2019-01-11 | 2020-07-16 | Michael J. Kawecki | Three-dimensional printed disc brake rotor |
| CN112443604A (en) * | 2019-09-04 | 2021-03-05 | 广州汽车集团股份有限公司 | Interior ventilation formula brake disc |
| CN111503186A (en) * | 2020-07-01 | 2020-08-07 | 莱州伟辰汽车配件有限公司 | Split type high-efficient heat dissipation type brake disc |
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Application publication date: 20210907 |