Hollow shaft motor, servo voltage buildup unit and integrated intelligent braking system

Abstract

The invention relates to a hollow shaft motor, a servo voltage buildup unit and an integrated intelligent braking system, the hollow shaft motor comprises a rotor assembly, a stator assembly, a hollow shaft, a confluence board, a motor male head and a motor shell, and one end of the motor shell is open; the hollow shaft is rotationally mounted in the motor shell through the four-point angular contact bearing and extends in the direction from one end of the motor shell to the other end of the motor shell; the rotor assembly fixedly sleeves the hollow shaft, and the stator assembly is fixedly installed on the inner wall of the motor shell and located outside the rotor assembly. And the motor male head is arranged at one end of the motor shell, is connected with the stator assembly through the confluence board, and is used for being connected with a controller. The motor has the beneficial effects of simple structure, reasonable design, small motor size, low cost, simplicity in installation and high motor efficiency; and meanwhile, the unique bearing angular contact ball bearing is adopted, so that the cost is reduced, the noise is reduced, and the problems of friction torque, dragging torque, motor torque fluctuation and the like of the motor can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless motors, and particularly to a hollow shaft motor, a servo pressure building unit and an integrated intelligent braking system. Background Art

[0002] In recent years, with the accelerating development of automotive electrification and intelligence, more requirements have been put forward for the by-wire chassis. As the penetration rate of new energy vehicles is getting higher and higher, shorter development cycles, faster product iteration speeds, better supporting and response capabilities, and cost gene advantages have become the new trends in the development of chassis systems. As a key component in the by-wire braking system, higher requirements are put forward for the servo motor.

[0003] The hollow shaft motor can install the ball screw of the pressure building actuator inside the hollow shaft, thus saving axial space and indirectly reducing the system mass, so it is more and more favored by major automobile manufacturers.

[0004] The traditional brushless single machine of the servo pressure building system of the braking system has two bearings, front and rear, the shaft is a solid shaft, and the shaft end is connected to a gear mechanism; it has defects such as complex structure, high cost, high noise, and high requirements for production line processes. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a hollow shaft motor, a servo pressure building unit and an integrated intelligent braking system, aiming to solve the problems in the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A hollow shaft motor includes a rotor assembly, a stator assembly, a hollow shaft, a motor busbar, a motor male head and a motor housing, and one end of the motor housing is open; the hollow shaft is rotatably installed in the motor housing through a four-point angular contact bearing and extends along the direction from one end to the other end of the motor housing; the rotor assembly is fixedly sleeved outside the hollow shaft, and the stator assembly is fixedly installed on the inner wall of the motor housing and is located outside the rotor assembly; the motor male head is installed on one end of the motor housing and is connected to the stator assembly through the motor busbar for connecting to a controller.

[0008] The beneficial effect of the present invention is: during the working process, in a permanent magnet synchronous motor, when the motor receives an electrical signal and power supply from the controller, the electromagnetic coil in the stator assembly will generate a magnetic field, and this magnetic field will interact with the magnetic field of the permanent magnet, thereby generating an electromotive force, which will cause the rotor assembly to generate a rotational movement, thus driving the hollow shaft and the load to operate.

[0009] The structure of the present invention is simple, with reasonable design, small motor size, low cost, easy installation, and high motor efficiency. At the same time, the unique bearing, angular contact ball bearing, is adopted, which reduces the cost, reduces the noise, and can also improve problems such as the friction torque, drag torque, and motor torque fluctuation of the motor.

[0010] On the basis of the above technical solutions, the present invention can be further improved as follows.

[0011] Furthermore, a bushing is fixedly installed on the motor housing, and one end face of the bushing contacts the inner ring of the four-point angular contact bearing.

[0012] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The inner ring of the four-point angular contact bearing is fixed on the hollow shaft through the bushing, which is convenient for assembly.

[0013] Furthermore, a through hole penetrating inside and outside is provided at the other end of the motor housing, and a motor end cover is fixedly installed at the through hole.

[0014] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The through hole is sealed by the motor end cover, which plays a role in dust prevention for the motor.

[0015] Furthermore, an end cover sealing ring is fixedly installed inside the motor end cover.

[0016] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The through hole is sealed by the motor end cover and the end cover sealing ring, which plays a role in dust-proof sealing for the motor.

[0017] Furthermore, a bearing retaining ring is fixedly installed on the inner wall of the motor housing, and the bearing retaining ring is fixedly connected to the outer ring of the four-point angular contact bearing.

[0018] The beneficial effect of adopting the above further solution is that the bearing retaining ring is fixed inside the motor housing by threads, and one side of it presses against the inner ring of the four-point angular contact bearing, fixing it inside the bearing seat and playing a role in fixing the bearing.

[0019] Furthermore, the motor busbar is integrally formed with the motor male head, and a seal is also installed on the motor male head.

[0020] The beneficial effect of adopting the above further solution is that the structure is more compact and occupies less space.

[0021] Furthermore, the motor busbar is in the shape of a lead frame structure, which is installed inside the motor housing, and a positioning pin is fixedly connected thereto.

[0022] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable, saving copper material and reducing the cost; reducing the resistance and improving the efficiency.

[0023] Further, the hollow shaft has a structure that is hollow inside and open at both ends, and it has a structure that is thinner at one end and thicker at the other end. The thick end of the hollow shaft is open at the end close to the motor housing, and its thin end is rotatably connected to the motor housing through the four-point angular contact bearing.

[0024] The beneficial effect of adopting the above further solution is that the structure of the hollow shaft is reasonably designed, which is convenient for assembly and is also convenient for cooperation with other structures.

[0025] The present invention also relates to a servo pressure building unit, which includes the hollow shaft motor as described above.

[0026] The beneficial effect of adopting the above further solution is that the present invention also provides a servo pressure building unit. This servo pressure building unit has a simple structure, reasonable design, small motor size, low cost, simple installation, and high motor efficiency; at the same time, by adopting the single bearing angular contact ball bearing, the cost is reduced, the noise is reduced, and problems such as the friction torque, drag torque, and motor torque fluctuation of the motor can also be improved.

[0027] The present invention also relates to an integrated intelligent braking system, which includes the servo pressure building unit as described above.

[0028] The beneficial effect of adopting the above further solution is that the present invention also provides an integrated intelligent braking system. This integrated intelligent braking system has a simple structure, reasonable design, small motor size, low cost, simple installation, and high motor efficiency; at the same time, by adopting the single bearing angular contact ball bearing, the cost is reduced, the noise is reduced, and problems such as the friction torque, drag torque, and motor torque fluctuation of the motor can also be improved. Description of the Drawings

[0029] Figure 1 is the assembly drawing of the present invention;

[0030] Figure 2 is the exploded view of the present invention;

[0031] Figure 3 is the assembly drawing of the motor busbar and the motor male head in the present invention.

[0032] In the drawings, the list of components represented by each reference numeral is as follows:

[0033] 1. Rotor assembly; 2. Stator assembly; 3. Hollow shaft; 4. Motor busbar; 5. Motor male head; 6. Motor housing; 7. Four-point angular contact bearing; 8. Bushing; 9. Motor end cover; 10. End cover sealing ring; 11. Bearing retainer ring; 12. Seal; 13. Locating pin. Detailed Embodiments

[0034] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, 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 thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0037] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0038] Embodiment 1

[0039] As Figures 1 to 3 shown, this embodiment provides a hollow shaft motor, which includes a rotor assembly 1, a stator assembly 2, a hollow shaft 3, a motor busbar 4, a motor male connector 5, and a motor housing 6. One end of the motor housing 6 is open; the hollow shaft 3 is rotatably mounted in the motor housing 6 through a four-point angular contact bearing 7 and extends along the direction from one end to the other end of the motor housing 6; the rotor assembly 1 is fixedly sleeved outside the hollow shaft 3, and the stator assembly 2 is fixedly installed on the inner wall of the motor housing 6 and is located outside the rotor assembly 1; the motor male connector 5 is installed on one end of the motor housing 6 and is connected to the stator assembly 2 through the motor busbar 4 for connecting to a controller.

[0040] During operation, in a permanent magnet synchronous motor, when the motor receives an electrical signal and power supply from the controller, the electromagnetic coils in the stator assembly generate a magnetic field, which interacts with the magnetic field of the permanent magnets, thereby generating an electromotive force. This electromotive force causes the rotor assembly to rotate, driving the hollow shaft and the load to operate.

[0041] Preferably, in this embodiment, the motor housing 6 has a cylindrical structure.

[0042] The four-point angular contact bearing 7 is a separable bearing, which is an angular contact ball bearing that can withstand bidirectional axial loads. Its inner and outer ring raceways are in a peach-shaped cross-section. When there is no load or only a pure radial load acting, the steel balls and the rings are in four-point contact. When only a pure axial load acts, the steel balls and the rings become two-point contact, and it can withstand bidirectional axial loads; the four-point angular contact ball bearing can also withstand moment loads, combining the functions of a single-row angular contact ball bearing and a double-row angular contact ball bearing.

[0043] In addition, the four-point angular contact bearing 7 can withstand the axial force, radial force, and moment of the motor hollow shaft, and can also meet the requirements of motor performance and durability. Compared with the two bearings of traditional motors, the system cost is further reduced; its function is to provide the rotational freedom of the motor hollow shaft and withstand the axial force, radial force, and moment of the motor hollow shaft.

[0044] The above-mentioned motor housing 6 is processed by deep drawing, which places high requirements on the processing equipment and molds; as the carrier of the motor assembly, it has high requirements for stiffness and strength. As the assembly reference for other components, certain dimensional accuracy must also be ensured. The main functions of the motor housing 6 are: as the carrier of the motor assembly, providing an assembly reference for other components; in addition, it can protect the internal components of the motor from being affected by the outside or the potential harm of polluting the environment; finally, it also has a certain heat dissipation function, so that the heat inside the motor will not accumulate and damage the motor.

[0045] The above-mentioned rotor assembly 1 is composed of a rotor core, permanent magnets, and a protective cover. The core manufacturing process is formed by stamping and laminating silicon steel sheets. The common thickness specifications of silicon steel sheets are 0.3 - 0.5 mm. The permanent magnets are surface-mounted on the outside of the rotor core and are fixed by the protective cover at the outer end. The specific structure of the rotor assembly 1 is prior art, and the specific assembly method will not be elaborated here.

[0046] In addition, the above-mentioned stator assembly 2 is composed of a stator core, insulating terminals, and enameled wires; the core manufacturing process is formed by stamping and laminating silicon steel sheets. The common thickness specifications of silicon steel sheets vary from 0.3 - 0.5 mm. Insulating terminals are installed at both ends of the core, and the outer layer of the insulating terminals is sleeved with a coil winding, forming the stator assembly. The specific structure of the stator assembly 2 is prior art, and the specific assembly method will not be elaborated here.

[0047] The specific assembly method of the stator assembly 2 is as follows: The outer ring of the iron core is fixed to the motor housing 6 through interference fit, and the winding terminal at the upper end is welded to the motor busbar 4 by welding; Its basic function is that current passes through the winding, thereby generating a magnetic field. The rotating current signal generates a rotating magnetic field, which drives the rotor to rotate synchronously.

[0048] The specific structure of the above-mentioned motor busbar 4 (referring to the bus bar of the motor) is as follows: The copper sheet (leadframe) assembly is injection-molded in plastic, with a compact structure and good insulation performance; The installation method is that it is positioned on the iron core of the stator assembly 2 through the positioning pins at the lower end of the motor busbar 4, and the leadframe (referring to the lead frame) on the motor busbar 4 is welded to the terminal of the stator winding by welding; The layout of the copper sheet assembly has been optimized, reducing the consumption of copper materials; Its basic function is that the main role of the motor busbar 4 is to achieve electrical connection between the battery cells, thereby forming the required series and parallel relationships; On the other hand, because the motor busbar 4 is directly connected to the battery cells, it can also be used as a sampling point for the voltage and temperature of the battery cells. The motor busbar 4 has the characteristics of being easy to design, low impedance, anti-interference, good reliability, space-saving, and simple and fast assembly.

[0049] In this embodiment, the male motor head 5 and the motor busbar 4 are designed as an assembly. In the traditional technology, the male motor head and the motor busbar are separated for distinction; This embodiment has a more compact structure, more stable connection, and stronger shock resistance, avoiding the poor contact of the motor busbar and the skew of the identification angle caused by vibration. At the same time, it simplifies the process of the motor assembly line; The male terminal is also equipped with a sealed structure, with good sealing effect and a layout of three sealing rings, with a high sealing redundancy.

[0050] This embodiment has a simple structure, reasonable design, small motor size, low cost, simple installation, and high motor efficiency; At the same time, the use of a single angular contact ball bearing reduces costs, reduces noise, and can also improve problems such as the friction torque, drag torque, and motor torque fluctuation of the motor.

[0051] Embodiment 2

[0052] On the basis of Embodiment 1, in this embodiment, a bushing 8 is fixedly installed on the motor housing 6, and one end face of the bushing 8 is in contact with the inner ring of the four-point angular contact bearing 7.

[0053] This solution has a simple structure and reasonable design. The inner ring of the four-point angular contact bearing 7 is fixed on the hollow shaft 3 through the bushing 8, which is convenient for assembly.

[0054] Embodiment 3

[0055] On the basis of Embodiment 2, in this embodiment, a through hole penetrating inside and outside is provided at the other end of the motor housing 6, and a motor end cover 9 is fixedly installed at the through hole.

[0056] This solution has a simple structure and reasonable design. The through hole is sealed by the motor end cover 9, playing a role in dust prevention for the motor.

[0057] Preferably, in this embodiment, the edge of the above-mentioned motor end cover 9 is press-fitted into the other end of the motor housing by interference fit and needs to have sufficient holding force.

[0058] Embodiment 4

[0059] On the basis of Embodiment 3, in this embodiment, a end cover sealing ring 10 is fixedly installed on the inner side of the motor end cover 9.

[0060] This solution has a simple structure and reasonable design. The through hole is sealed by the motor end cover 9 and the end cover sealing ring 10, playing a role in dust-proof sealing for the motor.

[0061] Preferably, in this embodiment, the above-mentioned end cover sealing ring 10 is preferably made of rubber material and is manufactured by an injection molding process.

[0062] Embodiment 5

[0063] On the basis of the above embodiments, in this embodiment, a bearing retaining ring 11 is also fixedly installed on the inner wall of the motor housing 6, and the bearing retaining ring 11 is fixedly connected to the outer ring of the four-point angular contact bearing 7.

[0064] The bearing retaining ring 11 is fixed in the motor housing 6 by a thread. One side of it presses against the inner ring of the four-point angular contact bearing 7, fixing it in the bearing seat on the inner wall of the motor housing 6, playing a role in fixing the bearing.

[0065] Embodiment 6

[0066] On the basis of the above embodiments, in this embodiment, the motor busbar 4 and the motor male head 5 are integrally formed, and a seal 12 is also installed on the motor male head 5.

[0067] The structures of the above motor busbar 4 and the motor male head 5 are more compact and occupy less space.

[0068] Preferably, in this embodiment, the above-mentioned seal 12 is preferably a sealing ring.

[0069] Embodiment 7

[0070] On the basis of the above embodiments, in this embodiment, the motor busbar 4 has a lead frame-like structure, which is installed in the motor housing 6, and a positioning pin 13 is fixedly connected thereto.

[0071] In this solution, the motor busbar 4 has a simple structure, reasonable design, saves copper materials, reduces costs; reduces resistance and improves efficiency.

[0072] Example 8

[0073] Based on the above embodiments, in this embodiment, the hollow shaft 3 has a structure that is hollow inside and open at both ends, and has a structure that is thin at one end and thick at the other end. The thick end of the hollow shaft 3 is open at one end close to the motor housing 6, and its thin end is rotatably connected to the motor housing 6 through the four-point angular contact bearing 7.

[0074] The structural design of the hollow shaft 3 is reasonable, convenient for assembly, and easy to cooperate with other structures.

[0075] Example 9

[0076] Based on the above embodiments, in this embodiment, the present invention also relates to a servo pressure building unit, including the above-mentioned hollow shaft motor.

[0077] This embodiment also provides a servo pressure building unit. This servo pressure building unit has a simple structure, reasonable design, small motor size, low cost, simple installation, and high motor efficiency; at the same time, by using the unique bearing angular contact ball bearing, the cost is reduced, the noise is reduced, and problems such as the friction torque, drag torque and motor torque fluctuation of the motor can also be improved.

[0078] Example 10

[0079] Based on the above embodiments, this embodiment also relates to an integrated intelligent braking system, including the above-mentioned servo pressure building unit.

[0080] This embodiment also provides an integrated intelligent braking system. This integrated intelligent braking system has a simple structure, reasonable design, small motor size, low cost, simple installation, and high motor efficiency; at the same time, by using the unique bearing angular contact ball bearing, the cost is reduced, the noise is reduced, and problems such as the friction torque, drag torque and motor torque fluctuation of the motor can also be improved.

[0081] The working principle of the present invention is as follows:

[0082] During the working process, in a permanent magnet synchronous motor, when the motor receives an electrical signal and power supply from the controller, the electromagnetic coil in the stator assembly will generate a magnetic field, which will interact with the magnetic field of the permanent magnet, thereby generating an electromotive force. This electromotive force will cause the rotor assembly to generate a rotational motion, thereby driving the hollow shaft and the load to operate.

[0083] The advantages of the present invention are:

[0084] 1. Unique combination structure: The motor adopts a layout with a single bearing, which is a single-sided four-point angular contact ball bearing. Advantage: One less bearing reduces costs. The bearing is one of the noise sources of the motor. With one less noise source, the corresponding performance can be improved. At the same time, since there is one less part to assemble, the assembly process is simplified, reducing the cost of equipment investment;

[0085] 2. Unique design of the hollow shaft: The inner diameter of the hollow shaft has a certain taper design; Advantage: While ensuring the structural strength, it reduces the moment of inertia, improves the response time and efficiency;

[0086] 3. Unique design of the motor Busbar: It incorporates a unique copper sheet layout. Advantage: Saves copper material and reduces costs; Reduces resistance and improves efficiency;

[0087] 4. Unique design of the motor male connector: The motor male connector and the motor busbar are made into one body, and the long pins (usually pins) are wrapped inside by plastic parts. Advantage: The structure is more compact, the connection is more stable, the shock resistance is stronger, avoiding the poor contact of the motor busbar and the skew of the pins caused by vibration, and at the same time simplifying the process of the motor assembly line.

[0088] 5. Unique sealing design of the motor male connector: The male connector terminal is also equipped with a sealing structure. Innovative structure, good sealing effect, layout of three sealing rings, high sealing redundancy.

[0089] 6. Unique design of the motor housing: Anti-rotation parts and interfaces for MPS (referring to the motor position sensor) are machined on the motor housing.

[0090] The beneficial effects of the present invention are as follows:

[0091] 1. Realize the basic function of the servo pressure building unit: Provide driving force for building pressure in the servo pressure building unit; Implementation method: The controller provides electrical signals and power supply to the PMSM motor through 3 pins of the motor male connector. The PMSM motor converts electrical energy into mechanical energy of the hollow shaft rotation. The rotation of the hollow shaft is converted into the axial movement of the piston through a lead screw mechanism (not introduced in this patent). The axial movement of the piston further compresses the liquid volume to build liquid pressure in the system. In this process, the PMSM motor plays the role of driving force.

[0092] 2. Realize the fast pressure building function of the servo pressure building unit; Implementation method: The optimized Barbus design, with low impedance and anti-interference, makes the armature response of the motor faster; The optimized hollow shaft design, with small moment of inertia and large angular acceleration, makes the kinetic energy conversion response faster. Thus, the response of the servo pressure building system is fast.

[0093] 3. Achieve the lightweight of the integrated intelligent braking system; Implementation method: The motor adopts a single bearing, reducing the weight of another bearing, and the optimized design of the hollow shaft conical surface further reduces the weight.

[0094] It should be noted that all the electronic components involved in the present invention adopt the prior art, and the above-mentioned components are electrically connected to each other and to the controller, and the control circuit between the controller and each component is the prior art.

[0095] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed invention.

[0096] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0097] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hollow shaft motor, characterized in that: It includes a rotor assembly (1), a stator assembly (2), a hollow shaft (3), a motor busbar (4), a motor male connector (5) and a motor housing (6), and one end of the motor housing (6) is open; the hollow shaft (3) is rotatably installed in the motor housing (6) through a four-point angular contact bearing (7), and it extends along the direction from one end to the other end of the motor housing (6); the rotor assembly (1) is fixedly sleeved outside the hollow shaft (3), the stator assembly (2) is fixedly installed on the inner wall of the motor housing (6), and it is located outside the rotor assembly (1); the motor male connector (5) is installed on one end of the motor housing (6), and it is connected to the stator assembly (2) through the motor busbar (4) for connecting to a controller.

2. The hollow shaft motor according to claim 1, wherein: A bushing (8) is also fixedly installed on the motor housing (6), and one end face of the bushing (8) contacts the inner ring of the four-point angular contact bearing (7).

3. The hollow shaft motor according to claim 2, characterized in that: The other end of the motor housing (6) is provided with a through hole penetrating through the inside and outside, and a motor end cover (9) is fixedly installed at the through hole.

4. The hollow shaft motor according to claim 3, characterized in that: An end cover sealing ring (10) is fixedly installed on the inner side of the motor end cover (9).

5. The hollow shaft motor according to any one of claims 1 to 4, characterized in that: A bearing retaining ring (11) is also fixedly installed on the inner wall of the motor housing (6), and the bearing retaining ring (11) is fixedly connected to the outer ring of the four-point angular contact bearing (7).

6. The hollow shaft motor according to any one of claims 1-4, characterized in that: The motor busbar (4) and the motor male connector (5) are integrally formed, and a seal (12) is also installed on the motor male connector (5).

7. The hollow shaft motor according to any one of claims 1-4, characterized in that: The motor busbar (4) has a lead frame-like structure, it is installed in the motor housing (6), and a positioning pin (13) is fixedly connected thereto.

8. The hollow shaft motor according to any one of claims 1-4, characterized in that: The hollow shaft (3) has a structure with a hollow interior and both ends open, and it has a structure with one end thin and the other end thick. The thick end of the hollow shaft (3) is close to the open end of one end of the motor housing (6), and its thin end is rotatably connected to the motor housing (6) through the four-point angular contact bearing (7).

9. A servo pressure building unit, characterized in that: It includes the hollow shaft motor according to any one of claims 1-8.

10. An integrated intelligent braking system, characterized in that: It includes the servo pressure building unit according to claim 9.

Images