Braking system

Abstract

The present application relates to a brake system, including a brake disc, a wheel hub connected to the brake disc, and a bearing accessory sleeved on the wheel hub, the brake system also includes: a first circuit embedded in the brake disc; a second circuit embedded in the wheel hub and electrically connected to the first circuit; and a third circuit embedded in the bearing accessory and electrically connected to the second circuit, wherein when current flows to the first circuit via the second circuit and the third circuit, the first circuit generates heat to heat the brake disc. The braking performance of the brake system provided by the present application is not affected by low temperature and / or high humidity environments.

Description

Technical Field

[0001] The present application relates to the field of vehicle safety, and more specifically, to a braking system. Background Art

[0002] The brake device is installed in the vehicle to brake the vehicle during operation, that is, to slow down or stop the moving vehicle, or to keep the stopped vehicle immobile. The structure and performance of the brake device are also directly related to the safety of the vehicle and passengers. For example, the brake device includes a brake disc installed on the wheel hub, and a brake pad that contacts and squeezes the brake disc from both sides when the driver steps on the brake pedal, so as to brake the vehicle by means of the friction between the brake disc and the brake pad. Generally speaking, the brake disc is made of metal material. In areas with low temperature and / or high humidity, for vehicles that have not been driven for a long time, water droplets are easily condensed on the brake disc, and even a thin layer of ice is formed. Therefore, the brake disc and the brake pad may slip, which will affect the braking performance of the brake device and even cause the brake disc and the brake pad to rust. In addition, the friction between the low-temperature brake disc and the brake pad is also easy to produce unpleasant cold noise. Summary of the invention

[0003] An object of the present application is to provide a brake system whose braking performance is not affected by low temperature and / or high humidity environments.

[0004] According to one aspect of the present application, a brake system is provided, including a brake disc, a wheel hub connected to the brake disc, and a bearing accessory mounted on the wheel hub, the brake system also includes: a first circuit embedded in the brake disc; a second circuit embedded in the wheel hub and electrically connected to the first circuit; and a third circuit embedded in the bearing accessory and electrically connected to the second circuit, wherein when current flows to the first circuit via the second circuit and the third circuit, the first circuit generates heat to heat the brake disc.

[0005] Optionally, the brake disc includes a disc core and a disc body radially protruding from the disc core, and the first circuit includes a resistance wire embedded in the disc body and used to generate heat, and a first wire embedded in the disc core and electrically connected to the resistance wire.

[0006] Optionally, the first circuit also includes a first electrical insulating sheet attached to the disk core and a first conductive sheet attached to the first electrical insulating sheet, the first wire passes through the first electrical insulating sheet to be electrically connected to the first conductive sheet, the second circuit includes a second wire, a second electrical insulating sheet attached to the wheel hub, and a second conductive sheet attached to the second electrical insulating sheet, the second wire passes through the second electrical insulating sheet to be electrically connected to the second conductive sheet, and when the wheel hub is connected to the brake disc, the first conductive sheet is aligned with and contacts the second conductive sheet.

[0007] Optionally, the first electrically insulating sheet is shaped as an electrically insulating ring circumferentially attached to the core, and the first electrically conductive sheet is shaped as an electrically conductive ring circumferentially attached to the electrically insulating ring.

[0008] Optionally, the hub includes an outer wall for sleeve bearing accessories and coated with an electrical insulation layer, the second circuit also includes a conductive ring arranged around the electrical insulation layer, the second wire passes through the electrical insulation layer to be electrically connected to the conductive ring, and the third circuit includes a brush terminal that contacts the conductive ring and is slidable relative to the conductive ring.

[0009] Optionally, the third circuit further comprises an elastic element abutting against the brush terminal to apply a radial force toward the center of the conductive ring to the brush terminal.

[0010] Optionally, the bearing accessory includes a first row of rolling elements and a second row of rolling elements arranged around the outer wall, a first retaining frame for retaining the first row of rolling elements, and a second retaining frame for retaining the second row of rolling elements, one end of the elastic element abuts against the first retaining frame and the second retaining frame, and the other end of the elastic element abuts against the brush terminal, so that the elastic element is preloaded with an elastic force opposite to the radial force.

[0011] Optionally, a gap is provided between the first retainer and the second retainer, the one end of the elastic element spans the gap to abut against the first retainer and the second retainer respectively, and the first retainer and the second retainer are made of electrically insulating material.

[0012] Optionally, a gap is provided between the first retaining frame and the second retaining frame, and the third circuit also includes a third electrical insulating sheet attached to the first retaining frame and the second retaining frame across the gap, and a third wire passing through the third electrical insulating sheet to be electrically connected to the brush terminal, and the elastic element abuts against the first retaining frame and the second retaining frame via the third electrical insulating sheet.

[0013] Optionally, the device further includes an external circuit electrically connected to the third circuit and an electronic control unit for controlling the on and off of the external circuit.

[0014] Optionally, it also includes a brake pad configured to rub against a brake disc, and a temperature sensor disposed inside the brake pad, and the electronic control unit is configured to control the on-off of an external circuit based on a detected temperature of the temperature sensor.

[0015] According to the present application, the low-temperature brake disc is heated up due to the heat generated by the resistance wire, so that the water droplets that may have condensed or gathered on the brake disc will be dried, so that the brake disc remains dry in a low-temperature and / or high-humidity environment. At the same time, the electrical connection between the first circuit and the second circuit does not affect the detachability between the brake disc and the wheel hub, and the electrical connection between the second circuit and the third circuit is completed inside the bearing accessory, which is also suitable for the wheel hub and the bearing outer ring of the bearing accessory that may perform relative movement.

[0016] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0018] Figure 1 It is a front view of a brake system according to one embodiment of the present application, wherein features related to the brake disc are mainly shown.

[0019] Figure 2 is along Figure 1 A cross-sectional view of the brake system taken along line BB.

[0020] Figure 3 Detailed diagram of the electrical connection between the first circuit and the second circuit of the brake system according to one embodiment of the present application.

[0021] Figure 4 is a front view of a brake system according to another embodiment of the present application, wherein the Figure 1 A first insulating ring and a first conductive ring are different.

[0022] Figure 5 It is a detailed diagram of the electrical connection between the second circuit and the third circuit of the brake system according to one embodiment of the present application.

[0023] Figure 6 It is a detailed diagram of the electrical connection between the second circuit and the third circuit of the brake system according to another embodiment of the present application.

[0024] Figure 7 is a schematic block diagram of a brake system according to one embodiment of the present application. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0026] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0027] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0028] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] In this article, "electrical connection" can refer to the connection between different components in a circuit via conductors to conduct and / or utilize current, or it can also refer to the connection between different conductors in a circuit; and "head" and "tail" respectively refer to the upstream and downstream parts of the components and / or conductors along the direction of current flow.

[0030] Reference Figure 1 and Figure 2 , a brake system is provided, including: a brake disc 12, a first circuit 14 embedded inside the brake disc; a wheel hub 32 connected to the brake disc 12, a second circuit 34 electrically connected to the first circuit 14 embedded inside the wheel hub; and a bearing accessory 52 sleeved on the wheel hub 32, a third circuit 54 electrically connected to the second circuit 34 embedded inside the bearing accessory, wherein when current flows to the first circuit 14 along the direction of the arrow through the second circuit 34 and the third circuit 54, the first circuit 14 generates heat to heat the brake disc 12.

[0031] The brake disc 12 is made of a metal material and includes a disc core (also called a disc cap) 22 and a disc body (also called a friction surface) 24 radially protruding from the disc core 22. The disc core 22 is provided with a central through hole 23 and a plurality of first bolt holes 25 circumferentially equidistantly distributed around the central through hole 23. The disc body 24 can be a solid disc body or an air duct disc body. The air duct disc body includes a first sub-disc body 24A and a second sub-disc body 24B, which are significantly thinner than solid disc bodies of the same model, and a spacer (also called a ventilation rib) 24C forming an air duct, and the spacer 24C is sandwiched between the first sub-disc body 24A and the second sub-disc body 24B.

[0032] The hub 32 is made of a metal material and includes an aperture 35 to receive and connect to a rotatable output shaft (not shown) so that the hub 32 rotates with the output shaft. The hub 32 includes a generally cylindrical hub body 42 and a hub flange 44 radially protruding from the hub body 42. For example, the hub body 42 is provided with a first outer wall 43 for passing the central through hole 23 of the disc core 22 and a second outer wall 45 for sleeve-mounting the bearing fitting 52 along the axial direction A. The hub flange 44 is integrally formed on the hub body 42 and is located between the first outer wall 43 and the second outer wall 45 along the axial direction A. The hub flange 44 is provided with a plurality of second bolt holes (not shown) equidistantly distributed in the circumferential direction. After the first outer wall 43 of the hub body 42 passes through the central through hole 23 of the disc core 22, the hub flange 44 abuts against the disc core 22 and aligns the plurality of first bolt holes 25 with the plurality of second bolt holes, respectively, so as to connect the brake disc 12 to the wheel hub 32 by means of bolts passing through the first bolt holes 25 and the second bolt holes. Therefore, the brake disc 12 rotates together with the wheel hub 32.

[0033] When the driver steps on the brake pedal, the brake pad 10 begins to contact and squeeze the disc 24 from both sides to brake the vehicle by means of friction between the disc 24 and the brake pad 10. Therefore, whether water droplets condense on the disc 24 or even form a thin layer of ice will affect the braking performance of the brake system. In the brake system provided by the present application, the first circuit 14 can generate heat to heat the disc 24 when current flows, thereby preventing water droplets from condensing or forming a thin layer of ice on the disc 24.

[0034] Optionally, the first circuit 14 includes a resistance wire 16 embedded in the disk body and a first conductive wire 18 embedded in the disk core and electrically connected to the resistance wire 16. The resistance wire 16 converts electrical energy into heat energy and transmits it to the disk body 24 when current flows through it. For example, a first channel for receiving the resistance wire 16 is pre-formed inside the disk body to define an arrangement path of the resistance wire 16, and a second channel for receiving the first conductive wire 18 is pre-formed inside the disk core to define an arrangement path of the first conductive wire 18. The arrangement path of the resistance wire 16 can be designed according to specific application conditions. For example, the arrangement path of the resistance wire 16 can be roughly circular. For another example, as in Figure 1 As shown in the partial cutaway view, the arrangement path of the resistance wire 16 can be zigzag inside the disk core, so that the resistance wire 16 is spread throughout the entire disk body 24. For another example, the arrangement path of the resistance wire 16 can be irregular.

[0035] In any case, the head end of the first channel is connected to the tail end of the second channel, so that the head end of the resistance wire 16 can be electrically connected to the tail end of the first wire 18. It can be understood that the position where the head end of the first channel is connected to the tail end of the second channel, that is, the position where the head end of the resistance wire 16 is electrically connected to the tail end of the first wire 18, can be set inside the disk body or inside the disk core, so in practice, the head end of the first channel, that is, the head end of the resistance wire 16, will enter the inside of the disk core, or alternatively, the tail end of the second channel, that is, the tail end of the first wire 18, will enter the inside of the disk body. The tail end of the first channel terminates inside the disk body, so that the tail end of the resistance wire 16 is electrically connected to the disk body 24, that is, the brake disc 12 itself, that is, the brake disc 12 itself serves as the negative pole (shown by the ground symbol) for the current conduction in the resistance wire 16.

[0036] Optionally, in the case where the disk body 24 is a ventilated disk body, the first circuit 14 includes a first sub-resistance wire 16A embedded in the first sub-disk body, a second sub-resistance wire 16B embedded in the second sub-disk body, and a first wire 18 embedded in the disk core and electrically connected to the first and second sub-resistance wires 16A and 16B, respectively. Therefore, the head end of the second sub-resistance wire 16B is electrically connected to the first sub-resistance wire 16A via an additional channel pre-formed in the spacer 24C, and the first sub-resistance wire 16A and the second sub-resistance wire 16B connected in parallel are electrically connected to the tail end of the first wire 18.

[0037] Similarly, the arrangement path of the first wire 18 can be designed according to the specific application. Generally speaking, the arrangement path of the first wire 18 should be as short as possible and easy to process. Therefore, the second channel should avoid the first bolt hole 25 and extend along the cross section of the disk core 22 along the line BB. The head end 19 of the second channel (see Figure 3 ) is open so that the head end of the first wire 18 can be led out from the disk core 22.

[0038] During the manufacturing process of the brake system, the first circuit 14 can be pre-embedded inside the brake disc, and the second circuit 34 can be pre-embedded inside the wheel hub. During the subsequent assembly of the brake system, the brake disc 12 will be connected to the wheel hub 32, and the brake disc 12 may also need to be replaced separately during the use of the vehicle. Therefore, in the brake system provided by the present application, the electrical connection between the first circuit 14 and the second circuit 34 does not affect the detachability between the wheel hub 32 and the brake disc 12.

[0039] Optionally, refer to Figure 1 and Figure 3The first circuit 14 includes a first electrical insulating sheet 15 attached to the disk core 22 and a first conductive sheet 17 attached to the first electrical insulating sheet 15. The first electrical insulating sheet 15 covers the head end 19 of the second channel and the area near the head end 19 of the second channel with a first area. The first conductive sheet 17 covers the first electrical insulating sheet 15 with a second area smaller than the first area. The head end of the first conductive wire 18 passes through the first electrical insulating sheet 15 to be electrically connected to the first conductive sheet 17.

[0040] The second circuit 34 includes a second wire 38 embedded in the wheel hub. For example, a third channel for receiving the second wire 38 is pre-formed in the wheel hub to define an arrangement path of the second wire 38. The arrangement path of the second wire 38 should be as short as possible and easy to process, so the third channel extends in accordance with the cross section of the wheel hub 32 along line BB (considering that the brake disc 12 has been connected to the wheel hub 32). For example, the third channel extends from the second outer wall 45 of the wheel hub body 42 to the wheel hub flange 44. The head end of the third channel is open so that the head end of the second wire 38 can be led out from the second outer wall 45. The tail end 39 of the third channel (see Figure 3 ) is also open so that the tail end of the second wire 38 can be led out from the hub flange 44.

[0041] The second circuit 34 further includes a second electrical insulating sheet 35 attached to the hub flange 44 and a second conductive sheet 37 attached to the second electrical insulating sheet 35, the second electrical insulating sheet 35 being similar to the first electrical insulating sheet 15, and the second conductive sheet 37 being similar to the first conductive sheet 17. The tail end of the second wire 38 passes through the second electrical insulating sheet 35 to be electrically connected to the second conductive sheet 37. When the wheel hub 32 is connected to the brake disc 12, the first conductive sheet 17 is aligned with and contacts the second conductive sheet 37 to achieve electrical connection between the first wire 18 and the second wire 38, and at the same time, the first electrical insulating sheet 15 is aligned with and contacts the second electrical insulating sheet 35 to electrically insulate the first conductive sheet 17 and the second conductive sheet 37 from the wheel hub 32 and the brake disc 12 made of metal materials.

[0042] Reference Figure 4 Optionally, in order to more easily achieve electrical connection between the first circuit 14 and the second circuit 34 during the process of connecting the wheel hub 32 to the brake disc 12, the first electrically insulating sheet 15 can be formed as a first electrically insulating ring 15A circumferentially attached to the disc core 22 around the central through hole 23, and the first conductive sheet 17 can be formed as a first conductive ring 17A circumferentially attached to the first electrically insulating ring 15A.

[0043] It is understandable that in Figure 3In order to illustrate the details more clearly, the first and second conductive sheets 17, 37 and the first and second electrical insulating sheets 15, 35 are drawn with obvious thickness. However, the first and second conductive sheets 17, 37 and the first and second electrical insulating sheets 15, 35 are thin and will not cause the disc core 22 and the hub flange 44 to be separated, that is, they will not affect the connection between the brake disc 12 and the wheel hub 32.

[0044] Reference Figure 1 and Figure 5 The bearing fitting 52 includes a plurality of rolling bodies arranged around the second outer wall 45 and rollable relative to the second outer wall 45. For example, the rolling bodies are balls. Optionally, the plurality of rolling bodies include a first row of rolling bodies 53 and a second row of rolling bodies 55 separated along the axial direction A. Therefore, the second outer wall 45 constitutes a part of the bearing inner ring of the bearing fitting 52 to support the plurality of rolling bodies from the bottom. The remaining part of the bearing inner ring is constituted by an additional bushing 56 additionally arranged around the second outer wall 45. The bearing fitting 52 also includes a bearing outer ring 57 arranged around the plurality of rolling bodies to support the plurality of rolling bodies from the top. Sealing rings are arranged at both ends of the bearing outer ring 57 along the axial direction A to help maintain the internal space of the bearing fitting 52 defined by the bearing fitting 52 and the second outer wall 45.

[0045] A first retainer 58 is provided to retain the first row of rolling elements 53, and a second retainer 59 is provided to retain the second row of rolling elements 55. The first retainer 58, the second outer wall 45, and the bearing outer ring 57 together define the range of motion of each rolling element in the first row of rolling elements 53 in the internal space. Similarly, the second retainer 59, the second outer wall 45, the bearing outer ring 57, and the additional bushing 56 together define the range of motion of each rolling element in the second row of rolling elements 55 in the internal space. Meanwhile, in the internal space, the first retainer 58 and the second retainer 59 are spaced apart from each other at a first interval, the first and second retainers 59 and the second outer wall 45 are spaced apart from each other at a second interval, and the first and second retainers 59 and the bearing outer ring 57 are spaced apart from each other at a third interval.

[0046] During the driving of the vehicle, the wheel hub 32 is driven to rotate around the axis direction A. The rotation of the wheel hub 32 causes each rolling element in the first row of rolling elements 53 and each rolling element in the second row of rolling elements 55 to roll in place, but the first retainer 58, the second retainer 59, and the bearing outer ring 57 do not rotate. In the brake system provided by the present application, the electrical connection between the second circuit 34 and the third circuit 54 is completed between the wheel hub 32 and the bearing accessory 52 that are in relative motion.

[0047] Optionally, the second outer wall 45 is coated with an electrical insulating layer 61, and the second circuit 34 further includes a conductive ring 63 aligned with the first interval and arranged around the electrical insulating layer 61. Similar to the head end of the first wire 18 passing through the first electrical insulating sheet 15 to be electrically connected to the first conductive sheet 17, the head end of the second wire 38 passes through the electrical insulating layer 61 to be electrically connected to the conductive ring 63. The third circuit 54 includes a brush terminal 65 that contacts the conductive ring 63 and is slidable relative to the conductive ring 63. Therefore, when the conductive ring 63 rotates with the hub 32, the brush terminal 65 does not rotate, that is, it remains stationary relative to the first and second retaining frames 59 and the bearing outer ring 57. The brush terminal 65 can be made of carbon or other conductive materials. The brush terminal 65 includes a first surface 65A and a second surface 65B that are oppositely positioned along the radial direction of the conductive ring 63, and the first surface 65A contacts the conductive ring 63 and is slidable relative to the conductive ring 63. The area and shape of the first surface 65A can be designed according to specific application conditions.

[0048] Optionally, the third circuit 54 includes a third wire 60 embedded in the bearing outer ring 57. For example, a fourth channel for receiving the third wire 60 is pre-formed in the bearing outer ring 57 to define a portion of the arrangement path of the third wire 60. The arrangement path of the third wire 60 should be as short as possible and easy to process. The first end of the fourth channel is open so that the first end of the third wire 60 can be led out of the bearing outer ring 57, and the tail end 67 of the fourth channel (see Figure 5 or Figure 6 ) is also open so that the tail end of the third wire 60 can be introduced into the internal space from the bearing outer ring 57. The tail end 67 of the fourth channel is aligned with the first gap so that the tail end of the third wire 60 passes straight through the first gap to be electrically connected to the second surface 65B of the brush terminal 65.

[0049] Optionally, the third circuit 54 further includes an elastic element that abuts against the second surface 65B to apply a radial force toward the center of the conductive ring 63 to the brush terminal 65, so that the brush terminal 65 remains in contact with the conductive ring 63. For example, one end of the elastic element abuts against the first retainer 58 and the second retainer 59, and the other end of the elastic element abuts against the brush terminal 65, so that the elastic element is preloaded with an elastic force opposite to the radial force.

[0050] Reference Figure 5Optionally, the width of the second surface 65B along the axial direction A is greater than the width of the first interval along the axial direction A, and the elastic element is a coil spring 70A, and the diameter of the coil spring 70A is also greater than the width of the first interval along the axial direction A. One end of the coil spring 70A is fixed to the first retainer 58 and the second retainer 59 respectively across the first interval, and the other end of the coil spring 70A is fixed to the second surface 65B. Since the radial width of the second interval perpendicular to the axial direction A is smaller than the free length of the coil spring 70A, the coil spring 70A is compressed. In this case, the first retainer 58 and the second retainer 59 are made of non-metallic materials, such as composite materials, to have electrical insulation.

[0051] Reference Figure 6 Optionally, the elastic element is a coil spring 70B, and the diameter of the coil spring 70B is smaller than the width of the first interval along the axial direction A. In this case, the third circuit further includes a third electrical insulating sheet 72 attached to the first retainer 58 and the second retainer 59 across the first interval, and the tail end of the third wire 60 passes through the first interval and then passes through the third electrical insulating sheet 72 to be electrically connected to the second surface 65B of the brush terminal 65, so the elastic element abuts against the first retainer 58 and the second retainer 59 via the third electrical insulating sheet 72.

[0052] It is understood that the elastic element is electrically insulating, for example, the coil springs 70A, 70B themselves can be made of electrically insulating materials, or the coil springs 70A, 70B are coated with electrically insulating materials. Other types of elastic elements can also be utilized, for example, elastic pads made of rubber or foam, etc.

[0053] Reference Figure 1 and Figure 7 Optionally, the head end of the third wire 60 is electrically connected to an external circuit 80 provided at a suitable position of the vehicle via the arrangement path of the third wire 60, and the external circuit 80 is then electrically connected to the positive electrode of the battery 82 on board the vehicle, and the on-off of the external circuit 80 is controlled by the vehicle ECU (electronic control unit) 84. Since the negative electrode of the battery 82 is electrically connected to the vehicle body, the entire vehicle body is used as the negative electrode for current conduction, and there is a direct or indirect physical connection between the vehicle body made of metal material and the brake disc 12, and the current flowing through the resistance wire 16 can reach the vehicle body via the brake disc 12, so that each circuit in the brake system for heating the brake disc 12 adopts a single-wire system to realize current flow.

[0054] Optionally, the ambient temperature of the brake system can be detected by a temperature sensor 11 embedded in the brake pad 10, such as a thermocouple. The temperature sensor 11 is configured to detect the ambient temperature near the brake pad 10 and transmit a detection signal related to the ambient temperature to the vehicle ECU 84. The vehicle ECU 84 is configured to control the on-off of the external circuit 80 based on the detected temperature, i.e., the detection signal, of the temperature sensor 11. For example, when the vehicle ECU 84 determines that the detected temperature is lower than a preset temperature value, the external circuit 80 is controlled to be connected so that the current flows from the positive electrode of the battery 82 through the external circuit 80, the third circuit 54, and the second circuit 34 to reach the first circuit 14. The resistor 16 in the first circuit 14 converts the current flowing through the resistor 16 into heat to heat the disc 24.

[0055] It is understandable that the car owner can also control the on / off of the external circuit 80 via the vehicle ECU 84 by means of any application for the client 88 (e.g., a mobile phone APP). For example, the car owner can decide whether to connect the external circuit 80 for a period of time before using the car based on the temperature value obtained from the weather forecast or any other message. In addition or alternatively, the car owner can also decide whether to connect the external circuit 80 via the vehicle ECU 84 based on the temperature detected by the temperature sensor 11 provided by the vehicle ECU 84.

[0056] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A brake system, comprising a brake disc, a wheel hub connected to the brake disc, and a bearing accessory sleeved on the wheel hub, characterized in that: The brake system also includes: A first circuit embedded in the brake disc; a second circuit embedded in the hub and electrically connected to the first circuit; and A third circuit is embedded in the bearing accessory and electrically connected to the second circuit, wherein: When current flows to the first circuit via the second circuit and the third circuit, the first circuit generates heat to heat the brake disc.

2. The brake system according to claim 1, characterized in that: The brake disc comprises a disc core and a disc body radially protruding from the disc core. The first circuit comprises a resistance wire embedded in the disc body and used for generating heat and a first wire embedded in the disc core and electrically connected to the resistance wire.

3. The brake system according to claim 2, characterized in that: The first circuit also includes a first electrical insulating sheet attached to the disc core and a first conductive sheet attached to the first electrical insulating sheet, the first wire passes through the first electrical insulating sheet to be electrically connected to the first conductive sheet, the second circuit includes a second wire, a second electrical insulating sheet attached to the wheel hub, and a second conductive sheet attached to the second electrical insulating sheet, the second wire passes through the second electrical insulating sheet to be electrically connected to the second conductive sheet, and when the wheel hub is connected to the brake disc, the first conductive sheet is aligned with and contacts the second conductive sheet.

4. The brake system according to claim 3, characterized in that: The first electrically insulating sheet is shaped as an electrically insulating ring circumferentially attached to the core, and the first electrically conductive sheet is shaped as an electrically conductive ring circumferentially attached to the electrically insulating ring.

5. The brake system according to claim 3, characterized in that: The hub includes an outer wall coated with an electrical insulation layer for sleeve bearing accessories, the second circuit also includes a conductive ring arranged around the electrical insulation layer, the second wire passes through the electrical insulation layer to be electrically connected to the conductive ring, and the third circuit includes a brush terminal contacting the conductive ring and slidable relative to the conductive ring.

6. The brake system according to claim 5, characterized in that: The third circuit further includes an elastic element abutting against the brush terminal to apply a radial force toward the center of the conductive ring to the brush terminal.

7. The brake system according to claim 6, characterized in that: The bearing accessory includes a first row of rolling elements and a second row of rolling elements arranged around the outer wall, a first retaining frame for retaining the first row of rolling elements, and a second retaining frame for retaining the second row of rolling elements, one end of the elastic element abuts against the first retaining frame and the second retaining frame, and the other end of the elastic element abuts against the brush terminal, so that the elastic element is preloaded with an elastic force opposite to the radial force.

8. The brake system according to claim 7, characterized in that: A gap is provided between the first retainer and the second retainer, the one end of the elastic element spans the gap to abut against the first retainer and the second retainer respectively, and the first retainer and the second retainer are made of electrically insulating materials.

9. The brake system according to claim 7, characterized in that: A gap is provided between the first retainer and the second retainer, and the third circuit also includes a third electrical insulating sheet attached to the first retainer and the second retainer across the gap, and a third wire passing through the third electrical insulating sheet to be electrically connected to the brush terminal, and the elastic element abuts against the first retainer and the second retainer via the third electrical insulating sheet.

10. The brake system according to any one of claims 1 to 9, characterized in that: The invention also includes an external circuit electrically connected to the third circuit and an electronic control unit for controlling the on and off of the external circuit.

11. The brake system according to claim 10, characterized in that: It also includes a brake pad configured to rub against the brake disc, and a temperature sensor arranged inside the brake pad, and the electronic control unit is configured to control the on-off of the external circuit based on the detected temperature of the temperature sensor.

Images