Brake-by-wire booster

Abstract

The application discloses a brake-by-wire booster, which comprises a shell, a driving module and a braking module; the shell has a first mounting space; the driving module is installed in the first mounting space; the driving module comprises a driving assembly and a first transmission assembly; the driving assembly comprises a rotor; the first transmission assembly is installed in a mounting cavity; the first transmission assembly comprises a nut and a screw rod; the nut is coaxially arranged in the rotor; the nut is connected with the rotor; the screw rod is matched with the nut, so that the screw rod moves along the axial direction; the braking module is installed outside the shell and is in transmission connection with the screw rod. The coaxial arrangement of the rotor, the nut and the screw rod can effectively improve the transmission efficiency, reduce the loss of driving force, improve the brake flexibility, and meanwhile, the coaxial design makes the overall structural integration high and improves the space utilization.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a brake-by-wire booster. Background Technology

[0002] Against the backdrop of the booming development of new energy vehicles, and due to the lack of an engine to provide a vacuum source for brake boosters, as well as the rapid development and demands of driver assistance systems, new energy vehicles are increasingly adopting electric power boosters for braking assistance. Currently, brake-by-wire boosters on the market are basically divided into integrated and independent types.

[0003] Currently, most independent brake-by-wire boosters on the market use a dry, pure spring-loaded pedal feel simulator, paired with a rack and pinion or a screw and sleeve. The lack of lag in the pedal feel of this dry simulator results in a poor passenger experience and negative market feedback. Furthermore, rack and pinion or screw and sleeve transmissions require two sets of transmission pairs to reach the master cylinder from the motor, leading to low transmission efficiency and wasted motor performance.

[0004] In terms of structural layout, existing independent brake-by-wire boosters often have a relatively large axial dimension. Since independent brake-by-wire boosters are currently used in vehicle applications to replace traditional vacuum boosters, it is best if the space occupied by the booster in the vehicle layout is less than or equal to that occupied by the vacuum booster. Although the radial space of the independent brake-by-wire booster with this structural form is relatively smaller than that of the vacuum booster, the increased axial dimension greatly limits the types of vehicles that can be adapted and restricts its development. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a brake-by-wire booster that can provide better pedal feel, and the brake-by-wire booster has high transmission efficiency, making vehicle braking more flexible. In addition, the brake-by-wire booster occupies little space, which can save vehicle installation space.

[0006] According to an embodiment of the present invention, a brake-by-wire booster includes: a housing, a drive module, and a braking module; the housing has a first mounting space; the drive module is mounted in the first mounting space, the drive module includes a drive assembly and a first transmission assembly, the drive assembly includes a rotor; the first transmission assembly is mounted in a mounting cavity, the first transmission assembly includes a nut and a lead screw, the nut is coaxially disposed inside the rotor and connected to the rotor, the lead screw is adapted to the nut to allow the lead screw to move axially; the braking module is mounted outside the housing and is drively connected to the lead screw.

[0007] According to an embodiment of the present invention, the brake-by-wire booster can effectively improve transmission efficiency, reduce driving force loss, and improve braking flexibility by coaxially arranging the rotor, nut, and lead screw. At the same time, the coaxial design results in high overall structural integration and improved space utilization.

[0008] In addition, the brake-by-wire booster according to the present invention may also have the following additional technical features:

[0009] In some embodiments, the brake-by-wire booster further includes: a brake simulation module, the brake simulation module including a brake pedal; and a signal acquisition module, the signal acquisition module including a sensor, the sensor being used to acquire braking information from the brake pedal, and the drive module braking according to the braking information.

[0010] In some embodiments, the braking simulation module further includes: a piston cylinder, which is installed in the first mounting space and defines a first hydraulic chamber with the housing; a first piston, the housing further having a first mounting hole communicating with the first hydraulic chamber, the first piston being movably installed in the first mounting hole and adapted to extend into the first hydraulic chamber from the first mounting hole; a push rod, one end of which is throttle-connected to the brake pedal and the other end of which is throttle-connected to the first piston; and a first elastic element disposed between the first piston and the piston cylinder.

[0011] In some embodiments, the lead screw has a hollow channel extending through it along its axial direction, the cylinder body of the piston cylinder is installed in the hollow channel, the bottom wall of the piston cylinder is provided with a through hole, and the braking simulation module further includes: a transmission rod connected to the lower end of the first piston, the first elastic element being a spring, the spring being sleeved on the transmission rod, and the lower end of the transmission rod extending out of the piston cylinder through the through hole; and a connecting push rod, the upper end of which is fixedly connected to the transmission rod, and the lower end of which is spaced apart from the braking module by a predetermined distance, wherein when the connecting push rod abuts against the braking module, it is adapted to drive the braking module to brake.

[0012] In some embodiments, the brake-by-wire booster further includes: an oil reservoir, an oil pipe, and a control valve mounted on the oil pipe, the oil pipe connecting the oil reservoir and the first hydraulic chamber.

[0013] In some embodiments, the axis of the transmission rod and the axis of the connecting push rod both coincide with the axis of the lead screw.

[0014] In some embodiments, the housing has a second mounting hole, and the braking module is adapted to extend through the second mounting hole into the first mounting space. The braking module includes a lead screw push plate, and the lead screw and the connecting push rod are both adapted to move up and down to push the lead screw push plate.

[0015] In some embodiments, the housing further includes a second mounting space and a hydraulic flow channel. The second mounting space is provided with: a second piston, which is used to divide the second mounting space into a second hydraulic chamber and a support chamber, and the hydraulic flow channel communicates between the second hydraulic chamber and the second mounting space; and a second elastic member, which is located in the support chamber, and both ends of the second elastic member are fixedly connected to the second piston and the bottom wall of the support chamber, respectively.

[0016] In some embodiments, the housing includes a first housing and a second housing, the first housing including a housing body and a shell plate connected to one side of the housing body, wherein the housing body has a second mounting space, and the second housing is fixedly connected to the shell plate to define the first mounting space.

[0017] In some embodiments, a guide groove extending along the axial direction of the lead screw is provided in the hollow channel, and a guide protrusion is provided on the outer side wall of the piston cylinder. The guide groove cooperates with the guide protrusion to restrict the rotation of the lead screw.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a brake-by-wire booster according to an embodiment of the present invention;

[0020] Figure 2 It is based on Figure 1 A sectional view of line AA;

[0021] Figure 3 It is based on Figure 2 Enlarged view of region B in the middle;

[0022] Figure 4 This is a cross-sectional view of the piston cylinder and lead screw of the brake-by-wire booster according to an embodiment of the present invention;

[0023] Figure 5 It is based on Figure 4 A magnified view of region C in the middle.

[0024] Figure label:

[0025] 100. Brake-by-wire booster;

[0026] 1. Housing; 11. Second mounting space; 12. Hydraulic flow channel; 13. First housing; 14. Second housing;

[0027] 2. Drive module; 21. Drive assembly; 22. First transmission assembly; 211. Rotor; 212. Hollow cup; 221. Nut; 222. Lead screw; 2221. Guide groove;

[0028] 3. Braking module; 31. Lead screw push plate;

[0029] 4. Braking simulation module; 41. Piston cylinder; 42. First piston; 43. Push rod; 44. First elastic element; 45. Transmission rod; 46. Connecting push rod; 411. First hydraulic chamber; 412. Guide protrusion;

[0030] 5. Oil reservoir; 6. Oil pipe; 7. Control valve; 8. Second piston; 9. Second elastic element; 10. Signal acquisition module. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The following is for reference. Figures 1-5 A brake-by-wire booster 100 according to an embodiment of the present invention is described.

[0036] like Figures 1 to 5 As shown, the brake-by-wire booster 100 according to an embodiment of the present invention includes: a housing 1, a drive module 2, and a braking module 3; the housing 1 has a first mounting space; the drive module 2 is installed in the first mounting space, the drive module 2 includes a drive assembly 21 and a first transmission assembly 22, the drive assembly 21 includes a rotor 211; the first transmission assembly 22 is installed in the mounting cavity, the first transmission assembly 22 includes a nut 221 and a lead screw 222, the nut 221 is coaxially disposed inside the rotor 211 and connected to the rotor 211, the lead screw 222 is adapted to the nut 221 so that the lead screw 222 moves along its axial direction; the braking module 3 is installed outside the housing 1 and is drively connected to the lead screw 222.

[0037] In this embodiment, the drive module 2 is used to drive the braking module 3 to brake; the drive assembly 21 is used to provide driving force to drive the first transmission assembly 22 to transmit power, wherein, for example... Figure 2 As shown, the drive assembly 21 is a drive motor. The rotor 211 in the drive motor rotates relative to the stator, and the rotor 211 provides the driving force. In the first transmission assembly 22, the nut 221 is threadedly engaged with the lead screw 222. The nut 221 is fixedly connected to the rotor 211. The rotor 211, nut 221 and lead screw 222 are coaxially arranged. When the rotor 211 rotates, it can synchronously drive the nut 221 to rotate, so that the lead screw 222 moves axially, thereby driving the braking module 3, which is connected to the lead screw 222, to brake. This design can effectively improve the transmission efficiency, reduce the loss of driving force, and improve the braking flexibility.

[0038] In some embodiments, for example Figure 2 As shown, a bearing is provided between the rotor 211 and the stator. The bearing can provide support for the rotor 211 so that the rotor 211 will not collide with the stator during rotation.

[0039] According to an embodiment of the present invention, the wire-controlled braking booster 100, by coaxially arranging the rotor 211, nut 221 and lead screw 222, can effectively improve transmission efficiency, reduce driving force loss, and improve braking flexibility. At the same time, the coaxial design results in high overall structural integration and improved space utilization.

[0040] In some embodiments, such as Figures 1 to 5 As shown, the drive assembly 21 also includes a hollow cup 212, which is coaxially arranged with the rotor 211. The hollow cup 212 is installed inside the rotor 211 and is fixedly connected to the rotor 211. The hollow cup 212 rotates together with the rotor 211.

[0041] An angle sensor is installed at the hollow cup 212. During braking, the angle sensor can detect the rotation angle of the hollow cup 212 and transmit the detected data signal to the control unit in the drive module 2 after braking ends. The control unit controls the rotor 211 to reverse, and the angle of reversal is the same as the detected rotation angle, thereby driving the lead screw 222 to reset.

[0042] In one embodiment of the present invention, such as Figures 1 to 5 As shown, the brake-by-wire booster 100 further includes a brake simulation module 4 and a signal acquisition module 10. The brake simulation module 4 includes a brake pedal; the signal acquisition module 10 includes a sensor, which is used to acquire braking information from the brake pedal, and the drive module 2 brakes according to the braking information. In this embodiment, the brake simulation module 4 is used to simulate traditional hydraulic or vacuum-assisted braking to provide the user with a better pedal feel; the signal acquisition module 10 can acquire the braking signal and transmit the braking signal to the drive module 2, so that the drive module 2 drives the brake module 3 to brake. This design, while ensuring safe braking, can also provide the user with a better pedal feel, improving the user experience.

[0043] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, the braking simulation module 4 further includes: a piston cylinder 41, a first piston 42, a push rod 43, and a first elastic element 44; the piston cylinder 41 is installed in the first mounting space and defines a first hydraulic chamber 411 with the housing 1; the housing 1 also has a first mounting hole communicating with the first hydraulic chamber 411, the first piston 42 is movably installed in the first mounting hole and is adapted to extend into the first hydraulic chamber 411 from the first mounting hole; one end of the push rod 43 is throttle-connected to the brake pedal and the other end is throttle-connected to the first piston 42; the first elastic element 44 is disposed between the first piston 42 and the piston cylinder 41.

[0044] In this specific embodiment, when the user presses the brake pedal, the brake pedal transmits the user's pressing force to the push rod 43. The push rod 43 pushes the first piston 42 into the first hydraulic chamber 411. The first piston 42 compresses the first elastic element 44 and moves in the hydraulic oil. At this time, the first elastic element 44 provides a counter-thrust force, and the hydraulic oil provides resistance to simulate the real pedal feel, thereby providing the user with a better braking experience. When the braking ends, the compressed first elastic element 44 returns to its original position and pushes the first piston 42 back to its original position, thus resetting the first piston 42.

[0045] In some embodiments, a displacement sensor is provided at the braking simulation module 4. The displacement sensor is used to detect whether the braking simulation module 4 has been displaced. When displacement occurs, the displacement sensor transmits the detection signal to the control unit in the drive module 2 so that the control unit drives the braking component to brake.

[0046] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, the lead screw 222 has a hollow channel extending through it along its axial direction. The cylinder body of the piston cylinder 41 is installed inside the hollow channel. The bottom wall of the piston cylinder 41 is provided with a through hole. The braking simulation module 4 also includes: a transmission rod 45 and a connecting push rod 46. The transmission rod 45 is connected to the lower end of the first piston 42. The first elastic element 44 is a spring, which is sleeved on the transmission rod 45. The lower end of the transmission rod 45 extends out of the piston cylinder 41 through the through hole. The upper end of the connecting push rod 46 is fixedly connected to the transmission rod 45, and the lower end is spaced apart from the braking module 3 by a predetermined distance. When the connecting push rod 46 abuts against the braking module 3, it is suitable for driving the braking module 3 to brake.

[0047] In this specific embodiment, by placing the piston cylinder 41 within the hollow channel of the lead screw 222, the axial occupancy of the booster on the installation space can be effectively reduced, thereby adapting to more vehicle models and increasing applicability. The transmission rod 45 provides stable support for the first elastic element 44 and limits the radial movement of the first elastic element 44, preventing misalignment of the first elastic element 44 during compression or reset, which would affect the simulation of pedal feel. Furthermore, the transmission rod 45 can also drive the connecting push rod 46 to move. When the drive module 2 fails, the user can press the brake pedal to drive the connecting push rod 46 to move until the connecting push rod 46 abuts against and drives the brake module 3 to brake. When the drive module 2 is normal, the first piston 42 cannot move continuously due to the presence of hydraulic oil. This design ensures that even if the drive module 2 fails and cannot drive the lead screw 222 to drive the brake module 3 to brake, the brake simulation module 4 can still directly drive the brake module 3 to brake, effectively improving the overall vehicle safety performance and protecting the user's safety.

[0048] In some embodiments, since the piston cylinder 41 is disposed within the hollow channel of the lead screw 222, the axial occupancy of the booster as a whole on the installation space is reduced. Therefore, the saved axial space can be used for lengthening the push rod 43, for example... Figure 2 As shown, the push rod 43 includes a fork and a rod, which are hinged together. By lengthening the push rod 43, the lateral force generated by the pedaling force can be reduced, the sealing performance of the first hydraulic chamber 411 can be guaranteed, and the risk of noise generation is also lower.

[0049] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, the brake-by-wire booster 100 also includes: an oil reservoir 5, an oil pipe 6, and a control valve 7 mounted on the oil pipe 6, which connects the oil reservoir 5 and the first hydraulic chamber 411. In this specific embodiment, the oil reservoir 5 is used to store hydraulic oil or supply hydraulic oil to the first hydraulic chamber 411. During normal braking, the first hydraulic chamber 411 is filled with hydraulic oil, and the control valve 7 on the oil pipe 6 is closed. Thus, when the first piston 42 extends into the first hydraulic chamber 411, the hydraulic oil in the first hydraulic chamber 411 can provide resistance to the first piston 42 to simulate a real pedal feel. When the drive module 2 fails, the control valve 7 on the oil pipe 6 is opened. Thus, when the first piston 42 extends into the first hydraulic chamber 411, the hydraulic oil in the first hydraulic chamber 411 is squeezed back into the oil reservoir 5, reducing the resistance on the first piston 42, thereby enabling the first piston 42 to move continuously so that the connecting push rod 46, which is connected to the transmission rod 45, can drive the braking assembly to brake, thereby ensuring user safety.

[0050] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, the axis of the transmission rod 45 and the axis of the connecting push rod 46 are both coincident with the axis of the lead screw 222. This can effectively improve transmission efficiency, reduce driving force loss, and improve braking flexibility.

[0051] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, the housing 1 has a second mounting hole, and the braking module 3 is adapted to extend into the first mounting space through the second mounting hole. The braking module 3 includes a lead screw 222 push plate, and both the lead screw 222 and the connecting push rod 46 are adapted to move up and down to push the lead screw 222 push plate. In this specific embodiment, the lead screw 222 push plate can provide a large transmission area so that both the lead screw 222 and the connecting push rod 46 can be connected to it for transmission, making the braking of the braking module 3 more convenient.

[0052] In some embodiments, for example Figure 2As shown, the upper and lower sides of the lead screw 222 push plate are respectively provided with a first annular groove and a second annular groove, so as to cooperate with the lead screw 222 and the transmission component of the brake module 3 respectively. The middle part of the lead screw 222 push plate is also provided with a through hole, so that the connecting push plate can pass through the through hole and cooperate with the transmission component of the brake module 3.

[0053] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, the housing 1 also has a second mounting space 11 and a hydraulic flow channel 12. The second mounting space 11 is provided with a second piston 8 and a second elastic member 9. The second piston 8 is used to divide the second mounting space 11 into a second hydraulic chamber and a support chamber. The hydraulic flow channel 12 connects the second hydraulic chamber and the second mounting space 11. The second elastic member 9 is located in the support chamber. The two ends of the second elastic member 9 are fixedly connected to the second piston 8 and the bottom wall of the support chamber, respectively.

[0054] In this specific embodiment, during normal braking, the first piston 42 extends into the first hydraulic chamber 411, and the hydraulic oil in the first hydraulic chamber 411 is squeezed into the second mounting space 11 through the hydraulic flow channel 12, which pushes the second piston 8 in the second mounting space 11 to move. The second piston 8 compresses the second elastic member 9, and the second elastic member 9 provides a counter-thrust force. In this way, the simulation of pedal feel can be made more realistic, and the user experience can be better.

[0055] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, the housing 1 includes a first housing 131 and a second housing 141. The first housing 131 includes a housing body and a housing plate connected to one side of the housing body. The housing body has a second installation space 11. The second housing 141 is fixedly connected to the housing plate to define the first installation space. This design facilitates processing, manufacturing and assembly, and also reduces space occupation.

[0056] In one specific embodiment of the present invention, such as Figures 1 to 5 As shown, a guide groove 2221 extending axially along the lead screw 222 is provided within the hollow channel, and a guide protrusion 412 is provided on the outer wall of the piston cylinder 41. The guide groove 2221 and the guide protrusion 412 cooperate to restrict the rotation of the lead screw 222. In this specific embodiment, the cooperation between the guide groove 2221 and the guide protrusion 412 can restrict the rotation of the lead screw 222, preventing the lead screw 222 from rotating during axial movement and effectively improving transmission efficiency.

[0057] The present invention also proposes a vehicle having the above-described embodiments.

[0058] According to the embodiments of the present invention, by providing the above-mentioned brake-by-wire booster 100, the vehicle can provide a better pedal feel, and the brake-by-wire booster 100 has high transmission efficiency, making the vehicle braking more flexible. In addition, the brake-by-wire booster 100 occupies little space, which can save vehicle installation space.

[0059] Other configurations and operations of the brake-by-wire booster 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A brake-by-wire booster, characterized in that, include: Housing (1), housing having a first installation space; The drive module (2) is installed in the first installation space. The drive module includes a drive assembly (21) and a first transmission assembly (22). The drive assembly includes a rotor. The first transmission assembly is installed in the installation cavity. The first transmission assembly includes a nut (221) and a lead screw (222). The nut is coaxially disposed in the rotor (211) and connected to the rotor. The lead screw is adapted to the nut so that the lead screw can move along its axial direction. Braking module (3), the braking module is installed outside the housing and is connected to the lead screw drive; Braking simulation module (4), the braking simulation module includes: Brake pedal Piston cylinder (41) is installed in the first installation space and defines a first hydraulic chamber (411) with the housing. The first piston (42) has a housing that also has a first mounting hole communicating with the first hydraulic chamber. The first piston is movably mounted in the first mounting hole and is adapted to extend into the first hydraulic chamber through the first mounting hole. The transmission rod (45) is connected to the lower end of the first piston. The first elastic element (44) is a spring, which is sleeved on the transmission rod. The lower end of the transmission rod extends out of the piston cylinder through the through hole. A connecting push rod (46) is fixedly connected to the transmission rod at its upper end and spaced a predetermined distance from the brake module at its lower end. When the connecting push rod comes into contact with the brake module, it is suitable for driving the brake module to brake. The axis of the transmission rod and the axis of the connecting push rod both coincide with the axis of the lead screw; The lead screw has a hollow channel that runs through it along its axial direction, the cylinder body of the piston cylinder is installed in the hollow channel, and the bottom wall of the piston cylinder is provided with a through hole. The drive assembly also includes: a hollow cup (212), which is coaxially arranged with the rotor. The hollow cup is installed inside the rotor and is fixedly connected to the rotor. The hollow cup rotates together with the rotor. An angle sensor is provided at the hollow cup. During braking, the angle sensor can detect the rotation angle of the hollow cup. After braking, the detected data signal is transmitted to the control unit in the drive module. The control unit controls the rotor to reverse. The angle of reversal is the same as the detected rotation angle, thereby driving the lead screw to reset.

2. The brake-by-wire booster according to claim 1, characterized in that, The brake-by-wire booster also includes: The signal acquisition module (10) includes a sensor, which is used to acquire braking information from the brake pedal, and the drive module brakes according to the braking information.

3. The brake-by-wire booster according to claim 2, characterized in that, The braking simulation module also includes: The push rod has one end connected to the brake pedal and the other end connected to the first piston. The first elastic element is disposed between the first piston and the piston cylinder.

4. The brake-by-wire booster according to claim 1, characterized in that, Also includes: The oil reservoir (5), the oil pipe (6), and the control valve (7) installed on the oil pipe are connected between the oil reservoir and the first hydraulic chamber.

5. The brake-by-wire booster according to claim 1, characterized in that, The housing has a second mounting hole, and the braking module is adapted to extend into the first mounting space through the second mounting hole. The braking module includes a lead screw push plate, and the lead screw and the connecting push rod are both adapted to move up and down to push the lead screw push plate.

6. The brake-by-wire booster according to claim 3, characterized in that, The housing also has a second mounting space (11) and a hydraulic flow channel (12), wherein the second mounting space is provided with: The second piston (8) is used to divide the second mounting space into a second hydraulic chamber and a support chamber, and the hydraulic flow channel connects the second hydraulic chamber and the second mounting space. The second elastic element (9) is located in the support cavity, and its two ends are fixedly connected to the second piston and the bottom wall of the support cavity, respectively.

7. The brake-by-wire booster according to claim 6, characterized in that, The housing includes a first housing (13) and a second housing (14). The first housing includes a housing body and a shell plate connected to one side of the housing body. The housing body has a second installation space, and the second housing is fixedly connected to the shell plate to define the first installation space.

8. The brake-by-wire booster according to claim 1, characterized in that, The hollow channel is provided with a guide groove (2221) extending along the screw axis, and the outer wall of the piston cylinder is provided with a guide protrusion (412). The guide groove and the guide protrusion cooperate to restrict the rotation of the screw.

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