Pressure build-up device, brake system, and vehicle

Abstract

The present application provides a pressure build-up device, a brake system, and a vehicle. The pressure build-up device comprises a main body, a first bearing, and a motor. The main body comprises a first shaft hole. The first bearing is arranged in the first shaft hole. The motor comprises a housing, a rotor, and a second bearing. The housing is connected to the main body. The rotor extends in a first direction. The rotor is supported on the main body by means of the first bearing. The rotor is supported on the housing by means of the second bearing. The second bearing and the first bearing are spaced apart in the first direction. The present application can improve the positioning precision and rotation stability of rotors.

Description

Pressure building device, braking system and vehicle

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410709059.1, filed on May 31, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of vehicles, in particular to a pressure building device, a braking system and a vehicle. BACKGROUND

[0004] The auxiliary pressure building device in the related art includes a main body, a piston, a threaded transmission assembly, a rotating bearing and a motor. The main body has a cylinder hole, the threaded transmission assembly is connected with the piston, the output shaft of the motor is connected with the threaded transmission assembly through the rotating bearing, and is used to drive the piston to move in the cylinder hole. However, the output shaft of the motor and the threaded transmission assembly are single-sided shaft positioning, and the positioning accuracy of the motor rotor is poor. TECHNICAL PROBLEM

[0005] The present application aims to solve the problem of poor positioning accuracy of the motor rotor in the related art. TECHNICAL SOLUTION

[0006] In one aspect, the present application provides a pressure building device, comprising:

[0007] a main body, the main body comprising a first shaft hole;

[0008] a first bearing, the first bearing being arranged in the first shaft hole; and

[0009] a motor, the motor comprising a housing, a rotor and a second bearing, the housing being connected to the main body, the rotor extending in a first direction, the rotor being supported on the main body through the first bearing, the rotor being supported on the housing through the second bearing, the second bearing and the first bearing being arranged in the first direction.

[0010] Optionally, the first shaft hole extends in the first direction;

[0011] the rotor is located inside the housing and is coaxially arranged with the first shaft hole, and the rotor is directly or indirectly fixed to the inner ring of the first bearing;

[0012] The pressure building device further comprises: an elastic member, the elastic member being located between the main body and the first bearing in the first direction, and the elastic member being adapted to apply an elastic force to the first bearing towards the motor.

[0013] Optionally, the main body has a first surface facing outward of itself along a first direction, and the pressure building device further comprises:

[0014] a cylinder member connected to the main body, the cylinder member protruding from the first surface along the first direction, an inner portion of the cylinder member forming a hydraulic chamber extending along the first direction;

[0015] a piston movably connected to the hydraulic chamber along the first direction; and

[0016] a rotary translation assembly at least partially penetrating the first shaft hole, the rotary translation assembly being drivingly connected to the rotor and the piston to convert a rotary motion of the rotor into a translational motion of the piston along the first direction,

[0017] an inner ring of the first bearing being connected to the rotary translation assembly.

[0018] Optionally, the rotary translation assembly comprises:

[0019] a lead screw penetrating the first shaft hole, the lead screw being coaxially arranged with the first shaft hole, the lead screw being connected to the piston; and

[0020] a nut threaded to the lead screw, the nut being fixed to the rotor, and the nut being fixed to the inner ring of the first bearing, such that the rotor is supported by the main body via the first bearing.

[0021] Optionally, the first shaft hole comprises a first bottom hole and a first stepped hole, the first bottom hole being closer to the hydraulic chamber than the first stepped hole along the first direction, the first stepped hole having a larger hole diameter than the first bottom hole, the first stepped hole forming a first stop surface;

[0022] the first bearing being located in the first stepped hole;

[0023] the elastic member being located between the first stop surface and an outer ring of the first bearing along the first direction, the elastic member being adapted to apply an elastic force to the outer ring of the first bearing away from the first stop surface.

[0024] Optionally, the pressure building device further comprises:

[0025] a guide assembly located in the main body, the guide assembly being adapted to guide the piston to move along the first direction and to prevent the piston from rotating with the rotor.

[0026] Optionally, the guide assembly comprises:

[0027] A first guide fixedly connected to the lead screw; and

[0028] A second guide fixedly connected to the main body, the second guide being guidedly fitted to the first guide along the first direction to guide the lead screw to translate along the first direction, and the second guide being limitingly fitted to the first guide in the circumferential direction of the lead screw to prevent the lead screw from rotating relative to the main body.

[0029] Optionally, an area of a cross section of the hydraulic cavity perpendicular to the first direction is greater than an area of a cross section of an end of the first shaft hole perpendicular to the first direction.

[0030] Optionally, the pressure building device comprises a sensing assembly comprising a sensing member and a measured member, the sensing member and the measured member are coaxially arranged with the rotor, the sensing member is fixedly arranged relative to the main body, the measured member is fixedly arranged relative to the rotor, and the sensing assembly is adapted to detect an angle of rotation of the rotor relative to the main body.

[0031] Optionally, the pressure building device comprises a cable electrically connected to the sensing member, the cable is arranged to pass through the main body, and the cable is adapted to be connected to a control device.

[0032] Optionally, the first shaft hole comprises a first bottom hole and a second stepped hole, the first bottom hole is closer to the hydraulic cavity than the second stepped hole in the first direction, a hole diameter of the second stepped hole is greater than a hole diameter of the first bottom hole, and the sensing member is accommodated in the second stepped hole.

[0033] Optionally, the cylinder member comprises a cylinder body and a first sealing cover, an end of the cylinder body is formed with a hydraulic groove adapted to accommodate the piston, a groove opening of the hydraulic groove is directed away from the motor in the first direction, the first sealing cover is sealingly connected to the groove opening of the hydraulic groove, and the first sealing cover and the cylinder body enclose the hydraulic cavity.

[0034] Optionally, an accommodation cavity is formed in the inside of the casing, the rotor is located in the accommodation cavity, an end of the casing away from the main body is provided with a second shaft hole extending along the first direction, the second shaft hole is communicated to the accommodation cavity and the outside of the casing, and the second bearing is located in the second shaft hole and sleeved on the end of the rotor.

[0035] The motor further comprises a second sealing cover sealingly connected to the second shaft hole to close the second shaft hole, and the second sealing cover is arranged to be spaced apart from the rotor in the first direction.

[0036] The second aspect of the present application provides a braking system, comprising the pressure building device.

[0037] The third aspect of the present application provides a vehicle, comprising the braking system. Advantages

[0038] The pressure building device provided by the technical scheme of the present application can help improve the positioning accuracy of the rotor and the stability of the rotor during rotation, because the rotor of the motor is supported on the main body through the first bearing arranged on the main body in addition to being supported on the casing through the second bearing in the motor.

[0039] The braking system provided by the technical scheme of the present application can improve the stability of the braking system by applying the pressure building device.

[0040] The vehicle provided by the technical scheme of the present application can improve the stability of the braking performance and help achieve better braking effect and user experience by applying the braking system. BRIEF DESCRIPTION OF DRAWINGS

[0041] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of embodiments of the present application, when taken in conjunction with the accompanying drawings. The drawings provided in the present application are used to provide further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0042] FIG. 1 is a sectional view of a pressure building device according to an embodiment of the present application;

[0043] FIG. 2 is a perspective view of a guide assembly according to an embodiment of the present application;

[0044] FIG. 3 is another sectional view of the pressure building device shown in FIG. 1;

[0045] FIG. 4 is a sectional view of a cylinder body, a main body, and a casing in a state of being connected to each other according to an embodiment of the present application;

[0046] FIG. 5 is an exploded perspective view of a sensing member to which a cable is connected according to an embodiment of the present application.

[0047] Explanation of reference signs: 100: pressure building device; 100a: first cavity; 100b: second cavity; 110: main body; 110a: first surface; 110b: second surface; 111: first shaft hole; 111a: first bottom hole; 111b: first stepped hole; 111c: second stepped hole; 112: first stop face; 113: wire passing hole; 114: first bearing; 120: cylinder member; 120a: hydraulic cavity; 121: cylinder body; 121a: hydraulic groove; 121b: liquid passing hole; 122: first sealing cover; 130: motor; 131: casing; 131a: accommodating cavity; 131b: second shaft hole; 131c: second bottom hole; 131d: third stepped hole; 131e: second stop face; 131f: mounting groove; 132: stator; 133: rotor; 133a: rotor shaft; 133b: third stop face; 133c: rotor groove; 134: second bearing; 135: second sealing cover; 140: piston; 141: piston body; 141a: first operation part; 142: piston sealing ring; 150: rotation and translation assembly; 151: screw rod; 151a: second operation part; 151b: weight-reducing groove; 152: nut; 160: guide assembly; 161: first guide; 161a: first rotation-stopping part; 162: second guide; 162a: second rotation-stopping part; 170: elastic member; 180: sensing assembly; 181: sensing member; 182: base; 182d: first connecting hole; 183: upper cover; 183a: positioning column; 183d: second connecting hole; 184: circuit board; 184a: positioning hole; 185: measured member; 186: cable; 190: control device; D: first direction. Embodiments of the present application

[0048] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. If it is so desired, the relative arrangement of constituent elements illustrated in these embodiments, numerical expressions, and numerical values are not limiting of the scope of the present application.

[0049] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting of the scope of the application or its applications or uses.

[0050] Techniques and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification where appropriate.

[0051] In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0052] It should be noted that like reference numerals and characters refer to like elements throughout the following description and the accompanying drawings. Once an element is defined in one drawing, it should not require further discussion in subsequent drawings.

[0053] In order to understand the present application, a detailed description will be given in the following description to illustrate the technical solutions provided by the present application. The preferred embodiments of the present application are described in detail as follows, however, the present application can have other embodiments in addition to these detailed descriptions.

[0054] Referring to FIG. 1 to FIG. 5, the present application provides a pressure building device 100, a brake system having the pressure building device 100, and a vehicle having the brake system.

[0055] The pressure building device 100 according to the embodiments of the present application can also be referred to as a hydraulic pressure building device. The pressure building device 100 can include a main body 110, a first bearing 114, and a motor 130. The main body 110 can include a first shaft hole 111. The first bearing 114 is connected to the first shaft hole 111. The motor 130 can include a casing 131, a rotor 133, and a second bearing 134. The casing 131 is connected to the main body 110. The rotor 133 extends in a first direction D, i.e., the axial direction of the rotor is parallel to the first direction D. The rotor 133 is located inside the casing 131 and is coaxially arranged with the first shaft hole 111. The rotor 133 is supported by the main body 110 through the first bearing 114. The rotor 133 is supported by the casing 131 through the second bearing 134. The second bearing 134 and the first bearing 114 are arranged in the first direction D.

[0056] According to the pressure building device 100 of the present application, the rotor 133 of the motor 130 is supported by the main body 110 through the first bearing 114 arranged on the main body 110 in addition to being supported by the casing 131 through the second bearing 134 in the motor 130, thereby helping to improve the positioning accuracy of the rotor 133. At the same time, the stability of the rotor 133 during rotation can be improved.

[0057] Optionally, the main body 110 has a first surface 110a and a second surface 110b facing in opposite directions along the first direction D. The casing 131 protrudes from the second surface 110b in the first direction D. This can reduce the space occupied by the casing 131 for the main body 110, and is conducive to the miniaturization of the volume of the main body 110.

[0058] Specifically, the electric machine 130 comprises a housing 131, a stator 132 and a rotor 133. The stator 132 is fixed in the housing 131. The stator 132 is wound with a field coil. An electronic control unit (ECU for short) transmits electric current to the field coil wound on the stator 132 through a cable 186, so that the field coil generates a varying magnetic field. The rotor 133 is coaxially arranged with the stator 132. The outer wall of the rotor 133 is provided with a fixed magnetic field, so as to realize the rotary motion of the rotor 133 under the action of the varying magnetic field of the stator 132. A second bearing 134 is arranged on the side of the electric machine 130 away from the main body 110, for fixing the rotor 133. A second sealing cover 135 is arranged on the end of the housing 131 away from the main body 110, for sealing. The main body 110 can be an oil block or a hydraulic block.

[0059] Electronic control unit (ECU for short), also known as "driving computer" of the automobile, their purpose is to control the driving state of the automobile and realize various functions. Mainly using various sensors, data acquisition and exchange of bus, to judge the state of the vehicle and the intention of the driver and control the car through the actuator.

[0060] For example, the first shaft hole 111 extends along the first direction D. The rotor 133 is located inside the housing 131 and coaxially arranged with the first shaft hole 111. The rotor 133 is axially parallel to the first direction D. The rotor 133 is directly or indirectly fixed to the inner ring of the first bearing 114. The build-up device 100 can further comprise a resilient member 170. The resilient member 170 is located between the main body 110 and the first bearing 114 along the first direction D. The resilient member 170 is adapted to apply an elastic force to the first bearing 114 towards the electric machine 130. Here, by arranging the resilient member 170, the first bearing 114 can be dynamically retained on the nut 152 by the elastic force, and at the same time, the assembly error between the first bearing 114 and the main body 110 in the first direction D can be compensated. Moreover, the resilient member 170 can absorb the vibration amount of the first bearing 114 in the first direction D.

[0061] Optionally, the resilient member 170 can be a compression spring, a clasp spring, an elastic metal sheet or other parts capable of elastic deformation.

[0062] Further, the pressure building device 100 can further include a cylinder member 120, a piston 140, and a rotary translation assembly 150. The cylinder member 120 is connected to the main body 110. The cylinder member 120 protrudes from the first surface 110a in the first direction D. An inner portion of the cylinder member 120 is formed with a hydraulic chamber 120a. The hydraulic chamber 120a extends along the first direction D. The piston 140 is movably arranged in the hydraulic chamber 120a along the first direction D. The rotary translation assembly 150 is at least partially arranged in the first shaft hole 111. The rotary translation assembly 150 is drivingly connected to the rotor 133 and the piston 140 to convert a rotary motion of the rotor 133 into a motion of the piston 140 translating along the first direction D. An inner ring of the first bearing 114 is connected to the rotary translation assembly 150. That is, the rotor 133 is indirectly connected to the first bearing 114 through the rotary translation assembly 150.

[0063] According to the pressure building device 100 of the embodiments of the present application, by arranging the cylinder member 120 to protrude from the first surface 110a of the main body 110, the hydraulic chamber 120a is designed separately from the cylinder member 120, which helps to achieve the technical purpose of increasing the pressure building area of the piston 140, while reducing the space occupation of the main body 110, and is also conducive to simplifying the structure of the main body 110 and realizing the miniaturization of the volume of the main body 110. By arranging the rotary translation assembly 150 in the first shaft hole 111 of the main body 110, the first shaft hole 111 can be designed separately according to the structure, shape and size of the rotary translation assembly 150, which is conducive to reducing the size of the first shaft hole 111 and improving the compactness of the structure of the hydraulic block. The rotary translation assembly 150 can transmit power and drive the piston 140 to translate.

[0064] Referring to FIGS. 1 and 3, for example, the rotary translation assembly 150 can include a lead screw 151 and a nut 152. The lead screw 151 is arranged in the first shaft hole 111. The lead screw 151 is coaxially arranged with the first shaft hole 111. The lead screw 151 is connected to the piston 140. The nut 152 is screwed to the lead screw 151. The nut 152 is directly or indirectly fixed to the rotor 133 through other intermediate parts. In the state that the motor 130 is running, the rotor 133 drives the nut 152 to rotate, so as to drive the lead screw to move in the first direction D through the threaded cooperation between the nut 152 and the lead screw 151 and the guiding effect of the piston 140 by the guiding assembly 160 to be described below, and further make the piston 140 translate in the first direction D along with the lead screw.

[0065] Referring to FIGS. 1, 3 and 4, optionally, the inner ring of the first bearing 114 is fixed to the nut 152. The outer ring of the first bearing 114 is supported on the main body 110. Thus, the rotor 133 is supported on the main body 110 through the first bearing 114, which can realize the support of the end portion of the rotor 133 outside the motor 130, thereby facilitating the simplification of the structure of the motor 130 and helping to improve the stability of the rotor 133 during rotation.

[0066] Referring to FIG. 1, FIG. 3 and FIG. 4, optionally, the first shaft hole 111 can include a first bottom hole 111a and a first stepped hole 111b. The first bottom hole 111a is closer to the hydraulic cavity 120a than the first stepped hole 111b in the first direction D. The first stepped hole 111b has a larger hole diameter than the first bottom hole 111a. The first stepped hole 111b is formed with a first stop surface 112. The first bearing 114 is located in the first stepped hole 111b. The elastic member 170 is located between the first stop surface 112 and the outer ring of the first bearing 114 in the first direction D. The elastic member 170 is adapted to apply an elastic force to the outer ring of the first bearing 114 away from the first stop surface 112. By arranging the elastic member 170 between the first stop surface 112 and the outer ring of the first bearing 114, it is beneficial to absorb the amount of vibration of the outer ring of the first bearing 114 in the first direction D.

[0067] Referring to FIG. 1 and FIG. 3, for example, the part of the pressure building device 100 corresponding to the main body 110 has a first cavity 100a and a second cavity 100b. The first cavity 100a and the second cavity 100b are located on opposite sides of the first bearing 114 in the first direction. The main body 110 can be provided with a passage on a track that does not intersect the first bearing 114 to communicate the first cavity 100a and the second cavity 100b. This can balance the pressure difference between the first cavity 100a and the second cavity 100b, thereby preventing the risk of lubricating oil being removed from the bearing.

[0068] Referring to FIG. 1 to FIG. 4, in addition, the pressure building device 100 can further include a guide assembly 160. The guide assembly 160 is located in the first shaft hole 111. The guide assembly 160 is adapted to guide the piston 140 to move in the first direction D and prevent the piston 140 from rotating with the rotor 133. By arranging the guide assembly 160 in the first shaft hole 111, compared with the related art of arranging the guide assembly 160 inside the motor 130, it is beneficial to reduce the volume and complexity of the structure of the motor 130. The guide assembly 160 of the present application is placed outside the motor 130, which is simple in structure and easy to process and install. The guide assembly 160 of the present application is placed outside the motor 130, which is simple in structure and easy to process and install.

[0069] With continued reference to FIGS. 1 and 3, for example, the guide assembly 160 can include a first guide 161 and a second guide 162. The first guide 161 is fixedly connected, directly or indirectly, to the lead screw 151. The second guide 162 is fixedly connected, directly or indirectly, to at least one of the main body 110 and the cylinder member 120. The second guide 162 is guidedly fitted to the first guide 161 in the first direction D to guide the lead screw 151 to translate in the first direction D. And the second guide 162 is limitingly fitted to the first guide 161 in the circumferential direction of the lead screw 151 to prevent the lead screw 151 from rotating relative to the main body 110. In short, by the cooperation of the first guide 161 and the second guide 162, the lead screw 151 can be guided to be movable relative to the main body 110 only in the first direction D. The guide assembly 160 of the present application is located between the piston 140 and the rotary translation assembly 150 for guiding the piston 140 to move in the cylinder.

[0070] Further, the first guide 161 can be configured as a rotation-stopping rod. One end of the rotation-stopping rod is fixed to the end of the lead screw 151. The other end of the rotation-stopping rod is connected to the piston 140. The outer circumferential surface of the rotation-stopping rod is formed with a first rotation-stopping portion 161a. The second guide 162 can be configured as a rotation-stopping disc. The rotation-stopping disc is sleeved outside the rotation-stopping rod. The outer circumferential surface of the rotation-stopping disc is fixed to the main body 110. The inner circumferential surface of the rotation-stopping disc is formed with a second rotation-stopping portion 162a. The second rotation-stopping portion 162a is guidedly fitted to the first rotation-stopping portion 161a in the first direction D. And the second rotation-stopping portion 162a is limitingly fitted to the first rotation-stopping portion 161a in the circumferential direction of the lead screw 151.

[0071] Alternatively, the rotation-stopping rod can be a round rod coaxially arranged with the piston 140 and the lead screw 151.

[0072] Exemplarily, the first rotation-stopping portion 161a is a rotation-stopping boss. The second rotation-stopping portion 162a is a rotation-stopping groove.

[0073] In other examples, the first rotation-stopping portion 161a can be a rotation-stopping groove, and the second rotation-stopping portion 162a can be a rotation-stopping boss.

[0074] Referring to FIG. 1 to FIG. 4, the rotating and translating assembly 150 is coaxially installed on the rotor 133 at the side close to the main body 110 according to the present application. The rotating and translating assembly 150 has the function of converting the rotating motion of the motor 130 into the linear motion of the piston 140. The rotating and translating assembly 150 comprises a nut 152 and a screw rod 151. The nut 152 is axially pre-pressed with the rotor 133, for example, one end of the nut 152 is pre-pressed and embedded in the inside of the rotor 133. And in the plane perpendicular to the first direction D, the orthographic projection of the nut 152 partially overlaps the orthographic projection of the rotor 133. In the example shown, the outer diameter of the nut 152 is smaller than the outer diameter of the rotor 133. The screw rod 151 at least partially extends out of the rotor 133. The guide assembly 160 is connected to the output end of the screw rod 151. The guide assembly 160 has a rotation-stopping disc and a rotation-stopping rod, which are placed in the first shaft hole 111 of the main body 110. The outer edge of the rotation-stopping rod has a rotation-stopping boss, which cooperates with the rotation-stopping groove arranged on the inner hole wall of the rotation-stopping disc to prevent rotation. The rotation-stopping disc is rigidly connected to the main body 110 by bolts or other fixing means.

[0075] One example of the installation method of the rotation-stopping rod, the piston 140 and the screw rod 151 is as follows: threaded holes are machined at both ends of the rotation-stopping rod. The rotation-stopping rod is screwed to the screw rod 151 and the piston 140 at both ends respectively. The end of the piston 140 away from the rotation-stopping rod is machined with a first operating part 141a, for example, an internal hexagon, for applying torque. The end of the screw rod 151 away from the piston 140 is machined with a second operating part 151a, for example, another internal hexagon. By using tools such as internal hexagon wrenches to act on the first operating part 141a and the second operating part 151a respectively, it is easier to assemble the rotation-stopping rod, the piston 140 and the screw rod 151 together. An annular step is arranged at the bottom of the hydraulic chamber 120a for supporting and installing the rotation-stopping disc. The piston 140 is pre-pressed to the end face of the rotation-stopping rod along the first direction D. The end of the screw rod 151 facing the rotation-stopping rod is provided with a weight-reducing groove 151b to reduce the weight of the screw rod 151.

[0076] The piston 140 comprises a piston body 141 and a piston sealing ring 142 located on the outer periphery of the piston body 141. The piston sealing ring 142 can seal the cylinder body 121 and the piston 140, so as to form a sealed chamber for containing hydraulic oil between the piston 140, the inner wall of the cylinder body 121 and the first sealing cover 122. The high-pressure oil in the hydraulic chamber 120a enters the oil passage in the main body 110 through the oil outlet of the cylinder body 121 and is transmitted to the brake cylinder at the brake wheel end.

[0077] Referring to FIG. 1, FIG. 3 and FIG. 4, for example, the area of the cross section of the hydraulic cavity 120a perpendicular to the first direction D is greater than the area of the cross section of the end of the adjacent first shaft hole 111 perpendicular to the first direction D. That is, the cross section of the hydraulic cavity 120a is larger than the cross section of the bottom hole of the first shaft hole 111. In this way, the pressure building area of the piston 140 can be increased. The rotation stopping disc is located in the hydraulic cavity 120a. In the plane perpendicular to the first direction D. The orthographic projection of the rotation stopping disc is at least partially located outside the orthographic projection of the end of the adjacent first shaft hole 111. That is, the outer diameter of the rotation stopping disc is greater than the hole diameter of the end of the first shaft hole 111 adjacent thereto. In this way, the rotation stopping disc can be reliably fixed while reducing the space occupied by the rotation stopping disc to the first shaft hole 111.

[0078] Optionally, the inner diameter of the rotation stopping disc is smaller than the hole diameter of the first shaft hole 111.

[0079] Optionally, the cross section area of the rotation stopping rod of the guide assembly 160 of the present application is smaller than the cross section area of the piston 140, and can enter the hydraulic cavity 120a together with the piston 140.

[0080] For example, the cylinder member 120 is partially clamped between the rotation stopping disc and the first surface 110a.

[0081] For example, the cylinder body 121 of the cylinder member 120 can be connected to the main body 110 as an integral piece. It can be understood that the cylinder body 121 can be manufactured as an integral part with the main body 110 in an integral molding manner. Alternatively, the cylinder body 121 can be assembled as an integral part with the main body 110 in a welding or other assembly manner. In this way, the sealing performance of the cylinder body 121 and the main body 110 can be improved, and at the same time, the sealing cost and the number of parts can be reduced.

[0082] Referring to FIG. 1, FIG. 3 and FIG. 5, for example, the pressure building device 100 can include a sensing assembly 180. The sensing assembly 180 includes a sensing piece 181 and a measured piece 185. The sensing piece 181 and the measured piece 185 are coaxially arranged with the rotor 133. The sensing piece 181 is fixedly arranged relative to the main body 110. The measured piece 185 is fixedly arranged relative to the rotor 133. The sensing assembly 180 is adapted to detect the angle of rotation of the rotor 133 relative to the main body 110. In the state that the sensing assembly 180 is connected to the control device 190, the control device 190 can receive the rotation angle of the rotor 133 detected by the sensing assembly 180, thereby helping to more accurately control the rotation angle of the rotor 133.

[0083] Optionally, the sensing piece 181 can include a Hall element. The measured piece 185 can include a magnetic piece. That is, the sensing assembly 180 can adopt a Hall encoder.

[0084] Referring to FIG. 1 and FIG. 3, for example, the pressure building device 100 can include a cable 186. The cable 186 is electrically connected to the sensing member 181. The cable 186 is routed through the main body 110. The cable 186 is adapted to be connected to the control device 190. By routing the cable 186 through the main body 110, the sensing member 181 is connected to the control device 190, thereby enabling communication between the sensing member 181 and the control device 190. Meanwhile, the cable 186 routed through the main body 110 can reduce the space occupation outside the main body 110, and also facilitate protection of the cable 186.

[0085] Optionally, the main body 110 is provided with a wire hole 113 for routing the cable 186.

[0086] Referring to FIG. 1, FIG. 3 and FIG. 4, for example, the first shaft hole 111 can include a first bottom hole 111a and a second stepped hole 111c. The first bottom hole 111a is closer to the hydraulic cavity 120a than the second stepped hole 111c in the first direction D. The second stepped hole 111c has a larger hole diameter than the first bottom hole 111a. The sensing member 181 is accommodated in the second stepped hole 111c. By arranging the second stepped hole 111c, the sensing member 181 can be accommodated, thereby improving the compactness of the connection structure of the main body 110 and the sensing member 181 in the first direction D.

[0087] Further, referring to FIG. 1, FIG. 3 and FIG. 5, the sensing element is spaced apart from the signal sensing unit around the axis thereof. The magnetic element is spaced apart from the blocking portion and the communication portion around the axis thereof. The blocking portion and the communication portion cause a change in the magnetic field when passing through the signal sensing unit, thereby generating an electric signal in the sensing element, so as to sense the rotation of the motor 130. Therefore, the coaxiality of the sensing element and the rotor 133 is ensured, so as to ensure the sensing accuracy of the sensing element.

[0088] Alternatively, the magnetic element can also be a gear ring, the blocking portion is configured as a tooth of the gear ring, and the communication portion is configured as a gap between the teeth. The signal sensing unit of the sensing element can be a Hall element. When the magnetic element rotates with the rotation of the rotor 133, the Hall element ultimately senses the rotor 133 by sensing the change in the magnetic field generated by the tooth or the gap between the teeth. The sensing of the rotor 133 includes the rotational position, the rotational speed and the number of rotations of the rotor 133.

[0089] As shown in FIG. 1 and FIG. 3, along the first direction D, the magnetic element is arranged between the sensing element and the rotor 133, so that the magnetic field generated by the stator 132 in the motor 130 does not affect the sensing accuracy of the sensing assembly. Specifically, the magnetic element is arranged in the second stepped hole 111c along with the rotating member, which has a good protection effect on the magnetic element.

[0090] Specific to the structure of the sensing element, as shown in FIG. 5, the sensing element includes a base 182, an upper cover 183, and a circuit board 184. The sensing element is annular as a whole, and the middle portions of the base 182, the upper cover 183, and the circuit board 184 are coaxially provided with a circular hole for passing the nut 152. The upper cover 183 is connected with the base 182. The upper cover 183 and the base 182 form an annular accommodating space. The circuit board 184 is arranged in the accommodating space, thereby fixing the circuit board 184. The circuit board 184 is provided with a signal sensing unit for sensing the electric signal generated by the rotation of the magnetic element. The cable 186 passes through the upper cover 183 and is connected with the circuit board 184, for transmitting the electric signal generated by the signal sensing unit to the control device 190, thereby sensing the rotor 133 of the motor 130.

[0091] Referring to FIG. 5, further, the base 182 is fixedly connected with the upper cover 183. The circuit board 184 is fixed relative to the base 182 or the upper cover 183, thereby ensuring the position of the signal sensing unit. The upper cover 183 is provided with a second connecting hole 183d. The base 182 is provided with a first connecting hole 182d corresponding to the connecting hole. The upper cover 183 and the base 182 are bonded, welded, or connected by fasteners through the cooperation of the second connecting hole 183d and the first connecting hole 182d, thereby ensuring the coaxiality between the upper cover 183 and the base 182.

[0092] Further, the circuit board 184 is provided with a positioning hole 184a. The upper cover 183 is provided with a positioning column 183a. The positioning column 183a passes through the positioning hole 184a, thereby coaxially arranging the upper cover 183 and the circuit board 184, and ensuring the installation position accuracy of the signal sensing unit through the installation of the outer upper cover 183 and the second stepped hole 111c.

[0093] Referring to FIG. 1, FIG. 3, and FIG. 4, for example, the cylinder member 120 can include a cylinder body 121 and a first sealing cover 122. An end of the cylinder body 121 is formed with a hydraulic groove 121a adapted to accommodate the piston 140. The groove opening of the hydraulic groove 121a is in the first direction D toward the side away from the motor 130. The first sealing cover 122 is sealingly connected to the groove opening of the hydraulic groove 121a. The first sealing cover 122 and the cylinder body 121 enclose to form a hydraulic cavity 120a. By dividing the cylinder member 120 into two parts of the cylinder body 121 and the first sealing cover 122, it is convenient to manufacture separately, which helps to improve the manufacturing accuracy. At the same time, it is convenient to assemble the piston 140 and other components in the hydraulic cavity 120a.

[0094] Optionally, the cylinder body 121 is provided with a liquid passage hole 121b at the end thereof away from the main body 110, which is connected to the oil passage of the main body 110 through a pipeline. For example, there are at least two liquid passage holes 121b. One of the liquid passage holes 121b is used for outputting oil, and the other liquid passage hole 121b is used for returning oil to the hydraulic chamber 120a. The first sealing cover 122 can be installed on the cylinder body 121 by screwing or the like.

[0095] With reference to FIGS. 1, 3 and 4, for example, the motor 130 can include a housing 131 and a second bearing 134. The housing 131 is sealingly connected to the main body 110. The housing 131 has an accommodation cavity 131a formed therein. The housing 131 is provided with a second shaft hole 131b at the end thereof away from the main body 110. The second shaft hole 131b is connected to the accommodation cavity 131a and the outside of the housing 131 in the first direction D. The second bearing 134 is located in the second shaft hole 131b and is sleeved on the end of the rotor 133 to support the rotor 133 in the housing 131. By providing the second bearing 134 at the end of the housing 131 away from the main body 110, the support of the rotor 133 can be achieved in cooperation with the first bearing 114. In this way, the structure of the motor 130 can be simplified.

[0096] Further, the second shaft hole 131b can include a second bottom hole 131c and a third stepped hole 131d. The second bottom hole 131c is farther away from the accommodation cavity 131a than the third stepped hole 131d in the first direction D. The aperture of the second bottom hole 131c is smaller than the aperture of the third stepped hole 131d. A second stop surface 131e is formed between the second bottom hole 131c and the third stepped hole 131d. The second stop surface 131e is located on the side of the second bearing 134 away from the main body 110. The second stop surface 131e abuts against the outer ring of the second bearing 134 in the first direction D. The rotor 133 can include a rotor shaft 133a. The rotor shaft 133a can include a third stop surface 133b. The third stop surface 133b is located on the side of the second bearing 134 close to the main body 110. The third stop surface 133b abuts against the inner ring of the second bearing 134 in the first direction D. Here, by utilizing the cooperation between the second stop surface in the second shaft hole 131b and the third stop surface 133b on the rotor shaft 133a, the limited installation of the second bearing 134 in the first direction D is achieved, the number of components is reduced, and the structure of the motor 130 is further simplified.

[0097] Optionally, the end of the rotor shaft 133a facing the main body 110 is provided with a rotor groove 133c in the first direction D. The rotor groove 133c extends in the first direction D. The rotor groove 133c is used to accommodate part of the lead screw 151 when the lead screw 151 moves away from the hydraulic chamber 120a. In this way, the compactness of the structure of the pressure building device 100 in the first direction D can be improved.

[0098] Furthermore, the motor 130 may also include a second sealing cover 135. The second sealing cover 135 is sealingly connected to the second shaft hole 131b to close the second shaft hole 131b. The second sealing cover 135 is arranged spaced apart from the rotor 133 along the first direction D. By adding the second sealing cover 135, the second shaft hole 131b can be sealed, thereby improving the sealing performance of the motor 130.

[0099] Optionally, a mounting groove 131f is provided at the end of the housing 131 in the first direction D away from the main body 110. The mounting groove 131f is adapted to the second sealing cover 135 of the receiving portion to facilitate the positioning and sealing of the second sealing cover 135.

[0100] This application also provides a braking system (not shown in the figure). The braking system may include the pressure build-up device 100 described above.

[0101] According to the braking system of this application, by applying the pressure-building device 100 described above, the stability of the braking system can be improved.

[0102] This application also provides a vehicle (not shown in the figure). The vehicle may include the braking system described above.

[0103] According to the vehicle of this application, by applying the above-mentioned braking system, the stability of braking performance can be improved, which helps to obtain better braking effect and user experience.

[0104] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0105] Similarly, it should be understood that, for the purpose of simplification and aiding understanding of one or more of the various embodiments, features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, this approach should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, the claimant's point is that the corresponding technical problem can be solved with fewer features than all of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0106] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0107] It should be noted that the above embodiments are illustrative of this application and not limiting of it, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A pressure building device (100), wherein, The pressure building device (100) comprises: a main body (110) comprising a first shaft hole (111); a first bearing (114) disposed in the first shaft hole (111); and a motor (130) comprising a casing (131), a rotor (133) and a second bearing (134), the casing (131) being connected to the main body (110), the rotor (133) extending along a first direction (D), the rotor (133) being supported on the main body (110) by the first bearing (114), the rotor (133) being supported on the casing (131) by the second bearing (134), the second bearing (134) and the first bearing (114) being spaced apart along the first direction (D).

2. The pressure building device (100) according to claim 1, wherein the first shaft hole (111) extends along the first direction (D); the rotor (133) is located inside the casing (131) and coaxially disposed with the first shaft hole (111), the rotor (133) being directly or indirectly fixed to an inner ring of the first bearing (114); the pressure building device (100) further comprises: a resilient member (170) located between the main body (110) and the first bearing (114) along the first direction (D), the resilient member (170) being adapted to apply a resilient force to the first bearing (114) towards the motor (130).

3. The pressure building device (100) according to claim 2, wherein the main body (110) has a first surface (110a) facing outwardly along the first direction (D), the pressure building device (100) further comprises: a cylinder member (120) connected to the main body (110), the cylinder member (120) protruding from the first surface (110a) along the first direction (D), an inner portion of the cylinder member (120) forming a hydraulic cavity (120a) extending along the first direction (D); a piston (140) movably connected to the hydraulic cavity (120a) along the first direction (D); and a rotary translation assembly (150) at least partially penetrating the first shaft hole (111), the rotary translation assembly (150) being drivingly connected to the rotor (133) and the piston (140) to convert a rotary motion of the rotor (133) into a translational motion of the piston (140) along the first direction (D), an inner ring of the first bearing (114) being connected to the rotary translation assembly (150).

4. The pressure building device (100) according to claim 3, wherein the rotary translation assembly (150) comprises: a screw rod (151) penetrating the first shaft hole (111), the screw rod (151) being coaxially arranged with the first shaft hole (111), the screw rod (151) being connected to the piston (140); and a nut (152) screwed to the screw rod (151), the nut (152) being fixed to the rotor (133), and the nut (152) being fixed to an inner ring of the first bearing (114), so that the rotor (133) is supported on the main body (110) by the first bearing (114).

5. The pressure building device (100) according to claim 3 or 4, wherein the first shaft hole (111) comprises a first bottom hole (111a) and a first stepped hole (111b), the first bottom hole (111a) being closer to the hydraulic cavity (120a) than the first stepped hole (111b) in the first direction (D), a hole diameter of the first stepped hole (111b) being larger than a hole diameter of the first bottom hole (111a), the first stepped hole (111b) being formed with a first stop face (112); the first bearing (114) is located at the first stepped hole (111b); the elastic member (170) is located between the first stop face (112) and an outer ring of the first bearing (114) in the first direction (D), the elastic member (170) being adapted to apply an elastic force to the outer ring of the first bearing (114) away from the first stop face (112).

6. The pressure building device (100) according to claim 4 or 5, wherein the pressure building device (100) further comprises: a guide assembly (160) located at the main body (110), the guide assembly (160) being adapted to guide the piston (140) to move in the first direction (D) and to prevent the piston (140) from rotating with the rotor (133).

7. The pressure building device (100) according to claim 6, wherein the guide assembly (160) comprises: a first guide member (161) fixedly connected to the screw rod (151); and a second guide member (162) fixedly connected to the main body (110), the second guide member (162) being guidedly fitted to the first guide member (161) in the first direction (D) to guide the screw rod (151) to translate in the first direction (D), and the second guide member (162) being limitingly fitted to the first guide member (161) in a circumferential direction of the screw rod (151) to prevent the screw rod (151) from rotating relative to the main body (110).

8. The pressure building device (100) according to any one of claims 3 to 7, wherein an area of a cross section of the hydraulic cavity (120a) perpendicular to the first direction (D) is larger than an area of a cross section of an end portion of the first shaft hole (111) perpendicular to the first direction (D).

9. The pressure building device (100) according to any one of claims 3 to 8, wherein the pressure building device (100) comprises: a sensing assembly (180) comprising a sensing member (181) and a sensed member (185), the sensing member (181) and the sensed member (185) are coaxially arranged with the rotor (133), the sensing member (181) is fixedly arranged relative to the main body (110), the sensed member (185) is fixedly arranged relative to the rotor (133), the sensing assembly (180) is adapted to detect an angle of rotation of the rotor (133) relative to the main body (110).

10. The pressure building device (100) according to claim 9, wherein the pressure building device (100) comprises: a cable (186) electrically connected to the sensing member (181), the cable (186) is threaded through the main body (110), the cable (186) is adapted to be connected to a control device (190).

11. The pressure building device (100) according to claim 9 or 10, wherein the first shaft hole (111) comprises a first bottom hole (111a) and a second stepped hole (111c), the first bottom hole (111a) is closer to the hydraulic cavity (120a) than the second stepped hole (111c) in the first direction (D), a hole diameter of the second stepped hole (111c) is larger than a hole diameter of the first bottom hole (111a), the sensing member (181) is accommodated in the second stepped hole (111c).

12. The pressure building device (100) according to any one of claims 3 to 11, wherein the cylinder member (120) comprises a cylinder body (121) and a first sealing cover (122), an end of the cylinder body (121) is formed with a hydraulic groove (121a) adapted to accommodate the piston (140), a groove opening of the hydraulic groove (121a) is directed to a side away from the motor (130) in the first direction (D), the first sealing cover (122) is sealingly connected to the groove opening of the hydraulic groove (121a), the first sealing cover (122) and the cylinder body (121) enclose to form the hydraulic cavity (120a).

13. The pressure building device (100) according to any one of claims 1 to 12, wherein an inside of the casing (131) is formed with an accommodating cavity (131a), the rotor (133) is located in the accommodating cavity (131a), an end of the casing (131) away from the main body (110) is provided with a second shaft hole (131b), the second shaft hole (131b) extends along the first direction (D), the second shaft hole (131b) is communicated to the accommodating cavity (131a) and an outside of the casing (131), the second bearing (134) is located in the second shaft hole (131b) and is sleeved on an end of the rotor (133). The electric machine (130) further comprises a second sealing cap (135) sealingly connected to the second shaft hole (131b) to close the second shaft hole (131b), the second sealing cap (135) being arranged spaced apart from the rotor (133) along the first direction (D).

14. A brake system wherein, The brake system comprises a pressure building device (100) according to any one of claims 1 to 13.

15. A vehicle, wherein, The vehicle comprises a brake system according to claim 14.

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