Brake master cylinder, brake assembly and vehicle

Abstract

The invention relates to a brake master cylinder, a brake assembly and a vehicle, the brake master cylinder comprises a cylinder body, a piston and a displacement sensor, the piston extends into the cylinder body and is slidably connected with the cylinder body, the displacement sensor comprises a displacement generator and a displacement receiver, the displacement generator is fixed in the piston and is used for transmitting signals, the displacement receiver is fixed relative to the cylinder body, and the displacement receiver is used for receiving the signals. And the sensor is used for receiving signals of the displacement generator to detect the sliding displacement of the piston relative to the cylinder body. The displacement generator in the displacement sensor is directly fixed in the piston, so that the design of an additional connection structure between the displacement generator and the cylinder body can be omitted, the matching error can be reduced, the displacement between the piston and the displacement generator is favorably limited, the displacement generator is prevented from shaking, and the reliability of the displacement sensor is improved. Therefore, the uniformity of multiple emission signals of the displacement generator in the reciprocating motion process of the piston is ensured, and the detection precision of the displacement sensor is improved. In addition, the displacement generator is contained in the piston, so that the space layout of the brake master cylinder is facilitated.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a brake master cylinder, a brake assembly and a vehicle. Background Art

[0002] As one of the core systems of the vehicle chassis, the brake master cylinder is used to decelerate or even stop the moving vehicle according to the driver's wishes, and plays a vital role in the field of vehicle safety. In the wire control braking scheme, a displacement sensor is usually used to collect the displacement signal of the piston in the brake master cylinder to provide corresponding braking force to the vehicle's brakes according to the displacement signal.

[0003] In the existing technical solutions, an additional connecting piece, such as an L-shaped bracket, is generally provided at the end of the piston rod, and the other end of the bracket is extended into the cylinder body. The displacement generator in the displacement sensor is fixed on the bracket and moves with the sliding of the piston in the cylinder body, and the displacement receiver is fixed on the cylinder body to receive the signal. However, due to the matching clearance between the bracket and the cylinder body and the piston, and the long support arm of the bracket, the bracket is prone to shaking during the movement with the piston, resulting in unreliable signals received by the displacement receiver, large errors, and reduced detection accuracy of the displacement sensor. Summary of the invention

[0004] In order to solve the above problems, the present application provides a brake master cylinder, which optimizes the structure of the brake master cylinder in a targeted manner and fixes the displacement generator in the displacement sensor in the piston to improve the detection accuracy of the displacement sensor, while also optimizing the spatial layout of the brake master cylinder. In addition, the present application also provides a brake assembly and a vehicle equipped with the brake master cylinder, specifically including the following solutions:

[0005] In the first aspect, the present application provides a brake master cylinder, which includes: a cylinder body, a piston and a displacement sensor, the piston extends into the cylinder body and is slidably connected to the cylinder body, the displacement sensor includes a displacement generator and a displacement receiver, the displacement generator is fixed in the piston and is used to transmit signals, the displacement receiver is fixed relative to the cylinder body and is used to receive the signal of the displacement generator to detect the displacement of the piston sliding relative to the cylinder body.

[0006] The brake master cylinder of the present application is provided with a piston extending into the cylinder body to enclose the cylinder body to form a sealed oil chamber, and the piston is provided with a sliding connection with the cylinder body to pressurize or depressurize the oil chamber. The pressure in the oil chamber provides a reaction force to the piston so that the driver can feel the brake foot. At the same time, the present application also provides a displacement sensor to detect the sliding displacement of the piston relative to the cylinder body, so as to control the electronic components in the brake master cylinder based on the displacement signal to ensure the normal operation of the brake master cylinder of the present application. Furthermore, the present application fixes the displacement generator in the displacement sensor in the piston, and the displacement receiver is fixed on the cylinder body. When the piston slides in the cylinder body, the displacement generator moves with the piston relative to the displacement receiver and transmits a signal. The displacement receiver can determine the stroke of the piston by receiving the changing transmission signal.

[0007] It can be understood that by directly fixing the displacement generator in the displacement sensor inside the piston, the design of the additional connection structure between the displacement generator and the cylinder body can be omitted, the matching error can be reduced, and it is beneficial to limit the displacement between the piston and the displacement generator, avoid the displacement generator from shaking, thereby ensuring the uniformity of the multiple signals emitted by the displacement generator during the reciprocating motion of the piston, and improving the detection accuracy of the displacement sensor. In addition, accommodating the displacement generator in the piston is also beneficial to the spatial layout of the brake master cylinder of the present application.

[0008] In one embodiment, one side of the piston is recessed along the axial direction of the piston to form a receiving groove, and the displacement generator is fixed in the receiving groove.

[0009] In this embodiment, a receiving groove is formed on one side of the piston along its own axial direction to fix the displacement generator in the receiving groove, that is, the displacement generator is fixed to the end of the piston along its own axial direction, so that the sealing of the oil chamber formed between the piston and the cylinder body can be ensured.

[0010] In one embodiment, the displacement generator is cylindrical, and the displacement generator is coaxially arranged with the piston.

[0011] In this embodiment, based on the columnar shape of the displacement generator, the displacement generator is coaxially arranged with the piston, thereby ensuring the structural stability of the piston and the uniformity of the force on the displacement generator.

[0012] In one embodiment, the displacement generator includes a magnetic member and a fixing member, wherein the magnetic member is fixed in the fixing member and is used to provide a magnetic field, and an outer side wall of the fixing member abuts against an inner side wall of the receiving groove.

[0013] In this embodiment, a magnetic member is provided to provide a stable magnetic field, so that during the movement of the piston, the displacement receiver can determine the displacement of the piston by sensing the change in the magnetic field strength. By fixing the magnetic member in the fixing member, the fixing member can be used to secure the magnetic member in the receiving groove of the piston, and the magnetic member can be prevented from being damaged due to friction between the magnetic member and the piston.

[0014] In one embodiment, the fixing member includes a plurality of ribs and a fixing ring, wherein the plurality of ribs are arranged at intervals along the circumference of the magnetic member, the fixing ring is arranged at the ends of the plurality of ribs along their own length direction and is fixedly connected to the plurality of ribs, and a gap is formed between two adjacent ribs.

[0015] In one embodiment, the fixing member includes a protective shell, which is arranged around the periphery of the magnetic member, and an outer side wall of the protective shell is provided with a groove, and the groove extends along the axial direction of the piston.

[0016] In this embodiment, a groove is provided on the outer wall of the protective shell to discharge the air in the receiving groove when the displacement generator is installed in the receiving groove, thereby reducing resistance and facilitating smooth installation and fixation of the displacement generator and the piston.

[0017] In one embodiment, the fixing member is an elastic member.

[0018] In this embodiment, the fixing member is set as an elastic member, that is, the fixing member has a certain elasticity. After the displacement generator is installed to a preset position in the receiving groove, the elastic recovery ability of the fixing member is utilized to squeeze the outer wall of the fixing member and the inner wall of the receiving groove, thereby improving the holding effect between the displacement generator and the piston.

[0019] In one embodiment, the fixing member is a non-metallic member.

[0020] In this embodiment, the fixing member is set as a non-metallic member, that is, the fixing member is made of non-metallic material to avoid the fixing member weakening or even shielding the magnetic field provided by the magnetic member, which is beneficial for the displacement receiver to receive signals.

[0021] In one embodiment, the cross-sectional area of ​​the fixing member in the radial direction of the piston gradually increases from the bottom wall of the receiving groove to the opening of the receiving groove.

[0022] In this embodiment, by gradually increasing the cross-sectional area of ​​the fixing member in the radial direction of the piston in the direction from the bottom wall of the receiving groove to the opening of the receiving groove, that is, setting the shape of the fixing member to a truncated cone shape, it is beneficial to the installation and fixation of the displacement generator and the piston.

[0023] In one embodiment, along the radial direction of the piston, a positioning protrusion is provided on the inner wall of the receiving groove, and a positioning groove is provided on the outer wall of the fixing member. The positioning protrusion extends into the positioning groove and abuts against the inner wall of the positioning groove to limit the displacement of the piston and the displacement generator along the axial direction of the piston.

[0024] In this embodiment, along the radial direction of the piston, a positioning protrusion is provided on the inner wall of the receiving groove, and a positioning groove is provided on the outer wall of the fixing member. The positioning protrusion and the positioning groove cooperate with each other to limit the displacement of the piston and the displacement generator along the axial direction of the piston, thereby improving the holding effect between the piston and the displacement generator, thereby further improving the detection accuracy of the displacement sensor.

[0025] In one embodiment, along the radial direction of the piston, a positioning protrusion is provided on the outer wall of the fixing member, and a positioning groove is provided on the inner wall of the receiving groove. The positioning protrusion extends into the positioning groove and abuts against the inner wall of the positioning groove to limit the displacement of the piston and the displacement generator along the axial direction of the piston.

[0026] In this embodiment, along the radial direction of the piston, a positioning protrusion is provided on the outer wall of the fixing member, and a positioning groove is provided on the inner wall of the receiving groove. The positioning protrusion and the positioning groove cooperate with each other to limit the displacement of the piston and the displacement generator along the axial direction of the piston, thereby improving the holding effect between the piston and the displacement generator, thereby further improving the detection accuracy of the displacement sensor.

[0027] In one embodiment, a positioning protrusion is provided on the outer wall of the fixing member, and there is one positioning groove, which extends along the circumference of the piston to form an annular structure. There are multiple positioning protrusions, each of which is arc-shaped. Multiple positioning protrusions are located on the side of the fixing member away from the bottom wall of the receiving groove, and multiple positioning protrusions are arranged at intervals along the circumference of the piston.

[0028] In one embodiment, a positioning protrusion is provided on the outer wall of the fixing member, there are a plurality of positioning grooves, each of which is in the shape of an arc, and the plurality of positioning grooves are arranged at intervals along the circumference of the piston, there are a plurality of positioning protrusions, each of which is in the shape of an arc, and the plurality of positioning protrusions are located on the side of the bottom wall of the fixing member away from the receiving groove, and the plurality of positioning protrusions are arranged at intervals along the circumference of the piston.

[0029] In one embodiment, the magnetic member includes at least two magnetic poles with opposite magnetic properties, and the at least two magnetic poles are arranged at two ends of the magnetic member along the axial direction of the piston.

[0030] In a second aspect, the present application provides a brake assembly, which includes a motor piston pump, a hydraulic unit and a brake master cylinder in any of the above-mentioned embodiments, wherein the motor piston pump includes a motor and a piston pump that are transmission-connected, the motor provides driving force to the piston pump, and the cylinder body of the piston pump and the brake master cylinder are respectively connected to the hydraulic unit and deliver brake fluid to the hydraulic unit.

[0031] It can be understood that the brake assembly provided in the second aspect of the present application adopts the brake master cylinder provided in the first aspect of the present application, and thus also has all possible beneficial effects in the embodiments provided in the first aspect of the present application.

[0032] In one embodiment, the brake assembly includes a controller, which is fixed relative to the hydraulic unit and is electrically connected to the displacement receiver and the motor of the brake master cylinder respectively.

[0033] In one embodiment, the brake master cylinder includes an elastic element and a limit seat, the limit seat is fixed to one end of the piston away from the cylinder body, and along the radial direction of the piston, the length of the limit seat is greater than the diameter of the piston, the elastic element is arranged around the periphery of the piston, and the elastic element is respectively connected to the cylinder body and the limit seat at opposite ends along the axial direction of the piston.

[0034] In this embodiment, a limit seat is provided to fix the elastic element, the elastic element is arranged around the periphery of the piston, and the elastic element is connected to the cylinder body and the limit seat along the opposite ends of the piston respectively, so as to utilize the elastic recovery ability of the elastic element to assist in resetting the piston.

[0035] In a third aspect, the present application further provides a vehicle, comprising wheels and a brake master cylinder or a brake assembly provided by any one of the above embodiments, wherein the brake master cylinder is used to brake the wheels.

[0036] It can be understood that the vehicle provided in the third aspect of the present application also has all possible beneficial effects in the embodiments provided in the first aspect or the second aspect of the present application because it adopts the brake master cylinder provided in the first aspect of the present application or the brake assembly provided in the second aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic cross-sectional structure diagram of a brake assembly provided in one embodiment of the present application;

[0039] Figure 2 This is a schematic diagram of the structure of a piston and a displacement generator provided in one embodiment of the present application;

[0040] Figure 3 This is a schematic diagram of the structure of a displacement generator provided in one embodiment of the present application;

[0041] Figure 4This is a schematic structural diagram of a displacement generator provided in another embodiment of the present application;

[0042] Figure 5 This is a schematic diagram of the structure of a brake assembly provided in one embodiment of the present application.

[0043] Figure numbers: 200-brake assembly; 210-motor piston pump; 211-motor; 220-hydraulic unit; 230-controller; 100-brake master cylinder; 10-cylinder body; 11-inner cavity; 20-piston; 21-piston rod; 22-receiving groove; 221-positioning groove; 30-displacement sensor; 31-displacement generator; 311-magnetic part; 312-fixing part; 312a-protective shell; 3121-groove; 3122-positioning protrusion; 313-rib; 314-fixing ring; 32-displacement receiver; 40-elastic element; 50-limit seat. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0045] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "including" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0048] It can be understood that the brake assembly of the present application can be applied to a vehicle. The vehicle may include a pedal, a brake assembly, a brake and a wheel. The pedal is connected to the input end of the brake assembly, and is used to transmit the pedaling force provided by the driver to the brake assembly, and the brake assembly can provide the driver with a foot feel. The brake is connected to the output end of the brake assembly and fixed to the wheel end of the vehicle. The output end of the brake assembly may include a mechanical output end and an electronic output end. That is, the brake assembly of the present application has the functions of both mechanical braking and electric braking. The brake is used to transmit the braking force or brake signal generated by the brake assembly to the wheel to achieve deceleration or braking. It should be noted that the vehicle provided in the present application can be a pure electric vehicle or a hybrid vehicle.

[0049] Please see Figure 1 and Figure 2 ,in Figure 1 A schematic cross-sectional view of a brake assembly 200 provided in one embodiment of the present application; Figure 2 Schematic diagram of the structure of the piston 20 and the displacement generator 31 provided in one embodiment of the present application.

[0050] like Figure 1 and Figure 2As shown, in one embodiment, the brake assembly 200 of the present application includes a brake master cylinder 100, which includes a cylinder body 10, a piston 20 and a displacement sensor 30. The cylinder body 10 has an inner cavity 11, and the piston 20 at least partially extends into the inner cavity 11 of the cylinder body 10 along the length direction of the cylinder body 10, and is sealed and connected with the cylinder body 10 to form an oil cavity. At the same time, the piston 20 is also slidably connected with the cylinder body 10, that is, the piston 20 slides relative to the cylinder body 10 along the length direction of the cylinder body 10. The pedal is transmission-connected with the piston rod 21 of the piston 20 to provide driving force to the piston 20. When the driver steps on the pedal, the piston 20 moves along its own axial direction relative to the cylinder body 10 toward the end away from the pedal, and compresses the oil in the inner cavity 11 to increase the pressure in the inner cavity 11. At the same time, the piston 20 also provides a reaction force to the pedal to provide the driver with a foot feel. When the driver releases the pedal, the piston 20 moves along its own axial direction relative to the cylinder body 10 toward the end close to the pedal, and the piston 20 returns to release the pressure on the cylinder body 10.

[0051] The displacement sensor 30 includes a displacement generator 31 and a displacement receiver 32. The displacement receiver 32 is fixed in the piston 20 and slides with the piston 20 in the inner cavity 11 of the cylinder 10, and the displacement generator 31 is used to transmit a signal. The displacement receiver 32 is fixed relative to the cylinder 10 and is arranged on one side of the piston 20 along the radial direction of the piston 20. The displacement receiver 32 is used to receive the signal emitted by the displacement generator 31, so that the displacement of the piston 20 sliding relative to the cylinder 10 can be detected, so that the control unit in the vehicle can identify the driver's braking intention based on the displacement signal, thereby controlling other electronic components and making corresponding braking decisions.

[0052] It can be understood that, by directly fixing the displacement generator 31 in the displacement sensor 30 inside the piston 20, the design of the additional connection structure between the displacement generator 31 and the cylinder body 10 can be omitted, the matching error can be reduced, and it is beneficial to limit the displacement between the piston 20 and the displacement generator 31, and avoid the displacement generator 31 from shaking, thereby ensuring the uniformity of the multiple signals emitted by the displacement generator 31 during the reciprocating motion of the piston 20, and improving the detection accuracy of the displacement sensor 30. In addition, accommodating the displacement generator 31 in the piston 20 is also beneficial to the spatial layout of the brake master cylinder 100 of the present application, and the displacement generator 31 does not contact the cylinder body 10, which can reduce the abnormal noise caused by sliding friction.

[0053] Specifically, in Figure 1In the illustrated embodiment, the piston 20 of the present application includes a receiving groove 22, which is roughly in the shape of a circular hole and extends along the axial direction of the piston 20. The receiving groove 22 is located on the side of the piston 20 away from the piston rod 21 along the axial direction of the piston 20. That is, the end surface of the piston 20 on the side close to the bottom wall of the cylinder body 10 is recessed toward the side of the piston rod 21 to form the receiving groove 22. The central axis of the receiving groove 22 coincides with the central axis of the piston 20. The displacement generator 31 is roughly columnar in shape, and the displacement generator 31 is fixed in the receiving groove 22, and the central axis of the displacement generator 31 coincides with the central axis of the piston 20. That is, the piston 20 and the displacement generator 31 are coaxially arranged.

[0054] It can be understood that, based on the need for the piston 20 to be sealed and connected to the cylinder body 10, setting the receiving groove 22 on the end face of the piston 20 can ensure the sealing between the piston 20 and the cylinder body 10 relative to setting the receiving groove 22 on the circumferential surface of the piston 20. At the same time, the displacement generator 31 is set at the end of the piston 20 away from the piston rod 21 to prevent the displacement generator 31 from interfering with the setting of the piston rod 21. At the same time, based on the piston rod 21 as the input end of the driving force of the pedal, the displacement generator 31 is set at the end of the piston 20 away from the piston rod 21 to avoid the piston rod 21 from being squeezed and displaced and causing damage to the displacement generator 31. In addition, the piston 20 and the displacement generator 31 are coaxially arranged to ensure that the displacement generator 31 is relatively uniformly impacted by the oil in the oil chamber during the reciprocating motion of the piston 20. At the same time, the structural stability of the piston 20 in the radial direction can be guaranteed.

[0055] It should be noted that the specific position and shape of the receiving groove 22 and the displacement generator 31 in the above embodiment are only used as an exemplary introduction and do not represent the specific position and shape of the receiving groove 22 and the displacement generator 31 in other embodiments of the present application.

[0056] Please see Figure 3 , Figure 3 Schematic diagram of the structure of a displacement generator 31 provided in an embodiment of the present application.

[0057] like Figures 1 to 3 As shown, in one embodiment, the displacement generator 31 of the present application includes a magnetic member 311 and a fixing member 312. The magnetic member 311 includes at least two magnetic poles with opposite magnetic properties, and the two magnetic poles are arranged at both ends of the magnetic member 311 along the axial direction of the piston 20 to generate a uniform and stable magnetic field. The magnetic member 311 can be a part that can generate a magnetic field, such as a magnetic steel or a magnet. At this time, the displacement receiver 32 is a magnetic displacement receiver 32. The fixing member 312 is roughly cylindrical, and the magnetic member 311 is fixed in the fixing member 312. The outer wall of the fixing member 312 abuts against the inner wall of the receiving groove 22.

[0058] It can be understood that in this embodiment, by providing a magnetic field through the magnetic member 311, the displacement receiver 32 can sense the change in the magnetic field strength to identify the displacement of the piston 20. At the same time, the fixing member 312 is provided to protect and fix the magnetic member 311, so that the magnetic member 311 can be firmly fixed in the receiving groove 22 of the piston 20, and the magnetic member 311 can be prevented from being damaged due to friction between the magnetic member 311 and the piston 20.

[0059] In one embodiment, the fixing member 312 is an elastic member and a non-metallic member. That is, the fixing member 312 is elastic and is made of non-metallic material. Specifically, the fixing member 312 can be made of plastic. It can be understood that by setting the fixing member 312 to have a certain elasticity, after the displacement generator 31 is installed to the preset position in the receiving groove 22, the elastic recovery ability of the fixing member 312 is utilized to squeeze the outer wall of the fixing member 312 and the inner wall of the receiving groove 22, thereby improving the holding effect between the displacement generator 31 and the piston 20. In addition, the fixing member 312 is made of non-metallic material to avoid the fixing member 312 from weakening or shielding the magnetic field provided by the magnetic member 311, which is beneficial for the displacement receiver 32 to receive the signal.

[0060] exist Figure 3 In the illustrated embodiment, the fixing member 312 is configured in the form of a cylindrical protective shell, the protective shell 312a is sleeved around the periphery of the magnetic member 311, and the outer wall of the protective shell 312a is provided with a groove 3121, the groove 3121 is in the shape of an elongated strip, and the number of the grooves 3121 is multiple, and the multiple grooves 3121 all extend along the axial direction of the protective shell 312a, that is, along the axial direction of the piston 20. And the multiple grooves 3121 are arranged at intervals along the circumference of the protective shell 312a. It can be understood that based on the pressure between the outer wall of the protective shell 312a and the inner wall of the receiving groove 22, when the displacement generator 31 is installed into the receiving groove 22, gas is easily generated in the receiving groove 22, which will affect the assembly of the displacement generator 31 and the piston 20. In this embodiment, a plurality of grooves 3121 are provided on the outer wall of the protective shell 312a so that when the displacement generator 31 and the piston 20 are assembled, the gas in the receiving groove 22 can be discharged, thereby reducing the resistance and facilitating the smooth installation and fixation of the displacement generator 31 and the piston 20.

[0061] It should be noted that the shape and number of the grooves 3121 in the above embodiment are only used as an exemplary introduction, and the present application does not make any special limitation on this.

[0062] Please refer to Figure 4 , Figure 4 It is a schematic structural diagram of a displacement generator 31 provided in another embodiment of the present application.

[0063] In one embodiment, the fixing member 312 includes a rib 313 and a fixing ring 314. There are multiple ribs 313, and the multiple ribs 313 are arranged at intervals along the circumference of the magnetic member 311. The fixing ring 314 is arranged at the end of the rib 313 along its own length direction, and can be specifically arranged on the side of the rib 313 away from the bottom wall of the receiving groove 22. The fixing ring 314 is fixedly connected to the multiple ribs 313. Each rib 313 is used to abut against the inner side wall of the receiving groove 22, and the gap formed between two adjacent ribs 313 is used to exhaust when the displacement generator 31 is installed in the receiving groove 22.

[0064] It can be understood that when the displacement generator 31 of the present application is assembled with the piston 20, the fixing member 312 of the displacement generator 31 and the receiving groove 22 of the piston 20 are interference fit, and the ribs 313 are used to abut against the inner side wall of the receiving groove 22 to stabilize the magnetic member 311 in the receiving groove 22. In order to facilitate the smooth installation of the displacement generator 31 in the receiving groove 22, the gap formed between two adjacent ribs 313 is used to discharge the gas in the receiving groove 22, thereby reducing the resistance.

[0065] It should be noted that the number of the fixing rings 314 can be one, two, or three, etc., and this application does not specifically limit this. When the number of the fixing rings 314 is two, the two fixing rings 314 are arranged on both sides of the ribs 313 along the length direction of the ribs 313 and are used to fix multiple ribs 313 at the same time.

[0066] In one embodiment, from the bottom wall of the receiving groove 22 to the opening of the receiving groove 22, that is, along the direction of the piston rod 21 toward the bottom wall of the cylinder body 10, the cross-sectional area of ​​the fixing member 312 in the radial direction of the piston 20 gradually increases. Or it can be understood that the shape of the fixing member 312 is similar to a truncated cone or a trumpet shape. It can be understood that setting the shape of the fixing member 312 to be similar to a truncated cone or a trumpet shape is conducive to the installation and fixation of the displacement generator 31 and the piston 20, and can make the assembly process more convenient and quick.

[0067] Please look back Figure 2In one embodiment, a positioning protrusion 3122 is provided on the outer wall of the fixing member 312. The positioning protrusion 3122 is located at one end of the fixing member 312 away from the bottom wall of the receiving groove 22. The positioning protrusion 3122 extends toward the inner wall of the piston 20 along the radial direction of the piston 20. A positioning groove 221 corresponding to the positioning protrusion 3122 is provided at a corresponding position on the inner wall of the receiving groove 22. The positioning groove 221 is recessed in the radial direction of the piston 20 away from the displacement generator 31. It can be understood that when the displacement generator 31 is assembled to the preset position of the receiving groove 22, the positioning protrusion 3122 extends into the positioning groove 221 and abuts against the inner wall of the positioning groove 221 to limit the displacement of the piston 20 and the displacement generator 31 in the axial direction of the piston 20, thereby improving the holding effect between the piston 20 and the displacement generator 31, and further improving the detection accuracy of the displacement sensor 30.

[0068] It should be noted that the positions of the positioning protrusion 3122 and the positioning groove 221 in the above embodiment are only used as an exemplary introduction, that is, the positions of the positioning protrusion 3122 and the positioning groove 221 in other embodiments of the present application can be adaptively adjusted according to the actual application scenario. For example, in another embodiment, the positioning protrusion 3122 can be set on the inner side wall of the receiving groove 22, and the positioning groove 221 can be set on the outer side wall of the fixing member 312, which can also limit the displacement of the piston 20 and the displacement generator 31 in the axial direction of the piston 20.

[0069] Further, please cooperate Figure 2 and Figure 3 In one embodiment, a positioning protrusion 3122 is provided on the outer wall of the fixing member 312, and a positioning groove 221 extends along the circumference of the piston 20 to form an annular structure or can be a plurality of arc-shaped positioning grooves 221 arranged at intervals along the circumference of the piston 20. There are multiple positioning protrusions 3122, and each positioning protrusion 3122 is in the shape of an arc. Multiple positioning protrusions 3122 are located on the side of the fixing member 312 away from the bottom wall of the receiving groove 22, and are arranged at intervals along the circumference of the piston 20, that is, arranged at intervals along the circumference of the magnetic member 311. When there are multiple positioning grooves 221, the number and shape of the positioning grooves 221 are respectively set corresponding to the number and shape of the positioning protrusions 3122, and each positioning protrusion 3122 extends into a positioning groove 221.

[0070] It can be understood that in the present embodiment, a plurality of positioning protrusions 3122 are arranged on the side of the bottom wall of the fixing member 312 away from the receiving groove 22, and the plurality of positioning protrusions 3122 are arranged at intervals along the circumference of the piston 20, so that when the displacement generator 31 and the piston 20 are assembled, the gaps between adjacent positioning protrusions 3122 can be used for exhaust. At the same time, the positioning protrusions 3122 are arranged at intervals, which can reduce the stress on each positioning protrusion 3122, thereby improving the reliability of the positioning protrusions 3122.

[0071] Please see Figure 5 , Figure 5 It is a structural schematic diagram of a brake assembly 200 provided in an embodiment of the present application.

[0072] like Figure 1 and Figure 5 As shown, in one embodiment, the brake assembly 200 of the present application also includes a motor piston pump 210 and a hydraulic unit 220. The motor piston pump 210 includes a motor 211 and a piston pump (not shown in the figure), and the motor 211 is transmission-connected to the piston pump and is used to provide a driving force to the piston pump. The piston pump is connected to the hydraulic unit 220 and is used to provide brake fluid to the hydraulic unit 220. In addition, the cylinder body 10 of the brake master cylinder 100 is also connected to the hydraulic unit 220, and can also provide brake fluid to the hydraulic unit 220. The hydraulic unit 220 then distributes the brake fluid from the motor piston pump 210 and / or the brake master cylinder 100 to the wheel end through the brake pipeline to achieve braking or deceleration.

[0073] In one embodiment, the brake assembly 200 of the present application includes a controller 230, which is fixed relative to the hydraulic unit 220. The controller 230 is electrically connected to the displacement receiver 32 of the brake master cylinder 100 and the motor 211 of the motor piston pump 210. The controller 230 can receive the electrical signal of the displacement receiver 32, analyze the electrical signal to identify the driver's braking intention, and control the motor 211 or other electronic components in the vehicle to make corresponding braking decisions. In addition, the controller 230 can also provide a power signal to the displacement generator 31.

[0074] Please look back Figure 1 In one embodiment, the master cylinder 100 of the present application further includes an elastic element 40 and a stopper 50. The stopper 50 is fixed to one end of the piston 20 away from the cylinder body 10, and along the radial direction of the piston 20, the length of the stopper 50 is greater than the diameter of the piston 20. The elastic element 40 is arranged around the periphery of the piston 20, and the opposite ends of the elastic element 40 along the axial direction of the piston 20 are respectively connected to the cylinder body 10 and the stopper 50. And the initial length of the elastic element 40 along the axial direction of the piston 20. Specifically, the elastic element 40 can be a spring.

[0075] It can be understood that in this embodiment, a limit seat 50 is provided to fix the elastic element 40. The elastic element 40 is disposed around the periphery of the piston 20, and the elastic element 40 is respectively connected to the cylinder body 10 and the limit seat 50 along the opposite ends of the piston 20, so as to utilize the elastic recovery ability of the elastic element 40 to assist in resetting the piston 20.

[0076] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0078] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A brake master cylinder, characterized in that: include: A cylinder body, a piston and a displacement sensor, wherein the piston extends into the cylinder body and is slidably connected to the cylinder body, and the displacement sensor includes a displacement generator and a displacement receiver, wherein the displacement generator is fixed in the piston and is used to transmit a signal, and the displacement receiver is fixed relative to the cylinder body and is used to receive the signal of the displacement generator to detect the displacement of the piston sliding relative to the cylinder body.

2. The brake master cylinder according to claim 1, characterized in that: One side of the piston is recessed along the axial direction of the piston to form a receiving groove, and the displacement generator is fixed in the receiving groove.

3. The brake master cylinder according to claim 2, characterized in that: The displacement generator is columnar and is coaxially arranged with the piston.

4. The brake master cylinder according to claim 2, characterized in that: The displacement generator comprises a magnetic member and a fixing member, wherein the magnetic member is fixed in the fixing member and is used to provide a magnetic field, and an outer side wall of the fixing member abuts against an inner side wall of the receiving groove.

5. The brake master cylinder according to claim 4, characterized in that: The fixing member includes a plurality of ribs and a fixing ring. The plurality of ribs are arranged at intervals along the circumference of the magnetic member. The fixing ring is arranged at the ends of the plurality of ribs along their own length direction and is fixedly connected to the plurality of ribs. A gap is formed between two adjacent ribs.

6. The brake master cylinder according to claim 4, characterized in that: The fixing member comprises a protective shell, the protective shell is sleeved on the periphery of the magnetic member, an outer side wall of the protective shell is provided with a groove, and the groove extends along the axial direction of the piston.

7. The brake master cylinder according to claim 4, characterized in that: The fixing member is a non-metallic member and / or an elastic member.

8. The brake master cylinder according to claim 4, characterized in that: Along the radial direction of the piston, the inner side wall of the receiving groove is provided with a positioning protrusion, and the outer side wall of the fixing member is provided with a positioning groove; or, The outer side wall of the fixing member is provided with a positioning protrusion, and the inner side wall of the receiving groove is provided with a positioning groove; The positioning protrusion extends into the positioning groove and abuts against the inner wall of the positioning groove to limit the displacement of the piston and the displacement generator along the axial direction of the piston.

9. The brake master cylinder according to claim 8, characterized in that: The outer side wall of the fixing member is provided with a positioning protrusion, the number of the positioning groove is one, and it extends along the circumference of the piston to form an annular structure; or the number of the positioning grooves is multiple, each of the positioning grooves is in an arc shape, and the multiple positioning grooves are arranged at intervals along the circumference of the piston; There are multiple positioning protrusions, each of which is arc-shaped. Multiple positioning protrusions are located on the side of the fixing member away from the bottom wall of the receiving groove, and multiple positioning protrusions are arranged at intervals along the circumference of the piston.

10. The brake master cylinder according to claim 4, characterized in that: The magnetic member comprises two magnetic poles with opposite magnetic properties, and the two magnetic poles are arranged at two ends of the magnetic member along the axial direction of the piston.

11. A brake assembly, characterized in that: It comprises a motor piston pump, a hydraulic unit and a brake master cylinder as described in any one of claims 1 to 10, wherein the motor piston pump comprises a motor and a piston pump which are transmission-connected, the motor provides driving force to the piston pump, the piston pump and the cylinder body of the brake master cylinder are respectively connected to the hydraulic unit and deliver brake fluid to the hydraulic unit.

12. The brake assembly according to claim 11, characterized in that: The brake assembly includes a controller, which is fixed relative to the hydraulic unit and is electrically connected to the displacement receiver of the brake master cylinder and the motor respectively.

13. A vehicle, characterized in that: The invention comprises a wheel and a brake master cylinder as claimed in any one of claims 1 to 10 or a brake assembly as claimed in any one of claims 11 to 12, wherein the brake master cylinder is used for braking the wheel.

Images