CN117141439A - Linear control brake booster - Google Patents

Abstract

The invention discloses a linear control brake booster, comprising: the device comprises a shell, a driving module and a braking module; the shell is provided with a first installation space; the driving module is arranged in the first installation space and comprises a driving assembly and a first transmission assembly, and the driving assembly comprises a rotor; the first transmission assembly is arranged in the installation cavity and comprises a nut and a screw rod, the nut is coaxially arranged in the rotor, the nut is connected with the rotor, and the screw rod is matched with the nut so that the screw rod moves along the axial direction of the screw rod; the braking module is arranged outside the shell and is in transmission connection with the screw rod. Through making rotor, nut and lead screw three coaxial setting, can effectively improve transmission efficiency, reduce the loss of drive power, improve brake flexibility, simultaneously, coaxial design makes the whole integrated level of structure high, has improved space utilization.

Description

Linear control brake booster

Technical Field

The invention relates to the technical field of vehicles, in particular to a linear control brake booster.

Background

Under the background of the explosive development of new energy automobiles, as the new energy automobiles do not have an engine to provide a vacuum source for a brake booster and assist the high-speed development and the requirement of driving, the new energy automobiles adopt an electric booster to brake and boost a large amount of power. The brake-by-wire power boosters currently on the market are basically divided into integrated and stand-alone power boosters.

The independent linear control brake booster structure in the market at present generally adopts a dry type, namely a pure spring pedal feel simulator, and the dry type pedal feel simulator is matched with a gear rack or a screw sleeve, so that passengers experience poorly due to lack of hysteresis feel, and market feedback is poor. The transmission mode of the gear rack or the screw rod screw sleeve has the advantages that the motor outputs to the main cylinder pushing process, two groups of transmission pairs are needed, the transmission efficiency is low, and the motor performance is wasted.

In structural arrangement, the existing independent linear control power booster often has the condition of relatively large axial dimension, and because the existing independent linear control power booster is used for replacing the traditional vacuum booster in the whole vehicle application, the occupied space requirement on the whole vehicle arrangement is smaller than or equal to the occupied space of the vacuum booster, and although the independent linear control power booster adopting the structural form is smaller in radial space than the vacuum booster, the axial dimension increase greatly limits the vehicle type capable of being matched and limits the development of the vehicle type.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the linear control power booster which can provide better pedal feel, has high transmission efficiency, enables the braking of the vehicle to be more flexible, occupies small space and can save the installation space of the vehicle.

A brake-by-wire booster according to an embodiment of the present invention includes: the device comprises a shell, a driving module and a braking module; the shell is provided with a first installation space; the driving module is arranged in the first installation space and comprises a driving assembly and a first transmission assembly, and the driving assembly comprises a rotor; the first transmission assembly is arranged in the installation cavity and comprises a nut and a screw rod, the nut is coaxially arranged in the rotor, the nut is connected with the rotor, and the screw rod is matched with the nut so that the screw rod moves along the axial direction of the screw rod; the braking module is arranged outside the shell and is in transmission connection with the screw rod.

According to the linear control brake booster provided by the embodiment of the invention, the rotor, the nut and the screw rod are coaxially arranged, so that the transmission efficiency can be effectively improved, the loss of driving force is reduced, the braking flexibility is improved, and meanwhile, the coaxial design ensures that the integral integration level of the structure is high, and the space utilization rate is improved.

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

in some embodiments, the brake-by-wire booster further comprises: a brake simulation module including a brake pedal; the signal acquisition module comprises a sensor, wherein the sensor is used for acquiring braking information of the brake pedal, and the driving module brakes according to the braking information.

In some embodiments, the brake simulation module further comprises: the piston cylinder is arranged in the first installation space and defines a first hydraulic cavity with the shell; the first piston is further provided with a first mounting hole communicated with the first hydraulic cavity, is movably mounted in the first mounting hole and is suitable for extending into the first hydraulic cavity from the first mounting hole; one end of the push rod is in transmission connection with the brake pedal, and the other end of the push rod is in transmission connection with the first piston; the first elastic piece is arranged between the first piston and the piston cylinder.

In some embodiments, the screw has a hollow passage penetrating the screw in an axial direction thereof, a cylinder body of the piston cylinder is installed in the hollow passage, a bottom wall of the piston cylinder is provided with a through hole, and the brake simulation module further includes: the transmission rod is connected to the lower end of the first piston, the first elastic piece is a spring, the spring is sleeved on the transmission rod, and the lower end of the transmission rod extends out of the piston cylinder from the through hole; the upper end of the connecting push rod is fixedly connected with the transmission rod, the lower end of the connecting push rod is spaced apart from the braking module by a preset distance, and the connecting push rod is suitable for driving the braking module to brake when being abutted to the braking module.

In some embodiments, the brake-by-wire booster further comprises: the oil storage tank, oil pipe and install the control valve on the oil pipe, oil pipe intercommunication be in between the oil storage tank and the first hydraulic pressure chamber.

In some embodiments, the axis of the drive rod and the axis of the connecting pushrod are both coincident with the axis of the lead screw.

In some embodiments, the housing has a second mounting hole, the brake module is adapted to extend into the first mounting space through the second mounting hole, the brake module includes a screw push plate, and the screw and the connecting push rod are both adapted to movably push the screw push plate up and down.

In some embodiments, the housing further has a second installation space and a hydraulic flow passage, the second installation space having disposed therein: the second piston is used for dividing the second installation space into a second hydraulic cavity and a supporting cavity, and the hydraulic flow passage is communicated between the second hydraulic cavity and the second installation space; the second elastic piece is positioned in the supporting cavity, and two ends of the second elastic piece are fixedly connected with the second piston and the bottom wall of the supporting cavity respectively.

In some embodiments, the housing comprises a first housing and a second housing, the first housing comprises a housing body and a housing plate connected to one side of the housing body, wherein the housing body is internally provided with the second installation space, and the second housing is fixedly connected with the housing plate so as to define the first installation space.

In some embodiments, a guide groove extending along the axial direction of the screw rod is arranged in the hollow channel, a guide protrusion is arranged on the outer side wall of the piston cylinder, and the guide groove is matched with the guide protrusion to limit the screw rod to rotate.

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.

Drawings

FIG. 1 is a schematic structural view of a brake-by-wire booster according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view according to line 1 A-A;

FIG. 3 is an enlarged view according to region B of FIG. 2;

FIG. 4 is a cross-sectional view of a piston cylinder and a lead screw of a linear actuation booster in accordance with an embodiment of the present invention;

fig. 5 is an enlarged view according to region C in fig. 4.

Reference numerals:

100. a linear control brake booster;

1. a housing; 11. a second installation space; 12. a hydraulic flow passage; 13. a first housing; 14. a second housing;

2. a driving module; 21. a drive assembly; 22. a first transmission assembly; 211. a rotor; 212. a hollow cup; 221. a nut; 222. a screw rod; 2221. a guide groove;

3. a brake module; 31. a screw rod pushing plate;

4. a brake simulation module; 41. a piston cylinder; 42. a first piston; 43. a push rod; 44. a first elastic member; 45. a transmission rod; 46. the push rod is connected; 411. a first hydraulic chamber; 412. a guide protrusion;

5. an oil storage tank; 6. an oil pipe; 7. a control valve; 8. a second piston; 9. a second elastic member; 10. and the signal acquisition module.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

In the description of the present 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", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

A brake-by-wire booster 100 according to an embodiment of the present invention is described below with reference to fig. 1-5.

As shown in fig. 1 to 5, a linear motor booster 100 according to an embodiment of the present invention includes: a housing 1, a drive module 2 and a brake module 3; the housing 1 has a first installation space; the driving module 2 is installed in the first installation space, the driving module 2 includes a driving assembly 21 and a first transmission assembly 22, and the driving assembly 21 includes a rotor 211; the first transmission assembly 22 is installed in the installation cavity, the first transmission assembly 22 comprises a nut 221 and a screw rod 222, the nut 221 is coaxially arranged in the rotor 211, the nut 221 is connected with the rotor 211, and the screw rod 222 is matched with the nut 221 so that the screw rod 222 moves along the axial direction of the screw rod; the brake module 3 is mounted outside the housing 1 and is in driving connection with the screw 222.

In the present embodiment, the driving module 2 is used for driving the braking module 3 to brake; the driving assembly 21 is configured to provide a driving force to drive the first transmission assembly 22 to drive, wherein, for example, as shown in fig. 2, the driving assembly 21 is a driving motor, a rotor 211 in the driving motor rotates relative to a stator, the rotor 211 provides the driving force, a nut 221 in the first transmission assembly 22 is in threaded fit with a screw rod 222, the nut 221 is fixedly connected with the rotor 211, the nut 221 and the screw rod 222 are coaxially arranged, and when the rotor 211 rotates, the driving assembly can synchronously drive the nut 221 to rotate so as to enable the screw rod 222 to move along an axial direction, thereby driving a braking module 3 in driving connection with the screw rod 222 to brake; by the aid of the design, transmission efficiency can be effectively improved, loss of driving force is reduced, and braking flexibility is improved.

In some embodiments, such as shown in fig. 2, a bearing is disposed between the rotor 211 and the stator, the bearing being capable of providing support to the rotor 211 so that the rotor 211 does not collide with the stator during rotation.

According to the brake-by-wire booster 100 provided by the embodiment of the invention, the rotor 211, the nut 221 and the screw rod 222 are coaxially arranged, so that the transmission efficiency can be effectively improved, the loss of driving force is reduced, the braking flexibility is improved, and meanwhile, the coaxial design ensures that the integral integration level of the structure is high, and the space utilization rate is improved.

In some embodiments, as shown in fig. 1 to 5, the drive assembly 21 further includes: the hollow cup 212, the hollow cup 212 and the rotor 211 are coaxially arranged, the hollow cup 212 is installed in the rotor 211 and fixedly connected with the rotor 211, and the hollow cup 212 rotates along with the rotor 211.

The angle sensor is arranged at the position of the hollow cup 212, and can detect the rotation angle of the hollow cup 212 during braking, and after the braking is finished, a detected data signal is transmitted to the control unit in the driving module 2, the control unit controls the rotor 211 to rotate reversely, and the reverse rotation angle is the same as the detected rotation angle, so that the screw rod 222 is driven to reset.

In one embodiment of the present invention, as shown in fig. 1 to 5, the linear control brake 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 comprises a sensor for acquiring braking information of the brake pedal, and the driving module 2 brakes according to the braking information. In this embodiment, the brake simulation module 4 is used for simulating conventional hydraulic or vacuum power-assisted braking, so as to provide a better pedal feel for a user; the signal acquisition module 10 can acquire a braking signal and transmit the braking signal to the driving module 2 so that the driving module 2 drives the braking module 3 to brake; by the design, on the premise of ensuring safety braking, a better pedal feel can be provided for a user, and the use experience of the user is improved.

In one embodiment of the present invention, as shown in fig. 1 to 5, the brake simulation module 4 further includes: a piston cylinder 41, a first piston 42, a push rod 43, and a first elastic member 44; the piston cylinder 41 is installed in the first installation space and defines a first hydraulic chamber 411 with the housing 1; the housing 1 further has a first mounting hole in communication with the first hydraulic chamber 411, the first piston 42 being movably mounted in the first mounting hole and adapted to extend from the first mounting hole into the first hydraulic chamber 411; one end of the push rod 43 is in transmission connection with the brake pedal, and the other end is in transmission connection with the first piston 42; the first elastic member 44 is disposed between the first piston 42 and the piston cylinder 41.

In this embodiment, when the user steps on the brake pedal to brake, the brake pedal transmits the stepping force of the user to the push rod 43, the push rod 43 pushes the first piston 42 to extend into the first hydraulic cavity 411, the first piston 42 compresses the first elastic member 44 and moves in the hydraulic oil, at this time, the first elastic member 44 provides a thrust force, and the hydraulic oil provides a resistance force to simulate the actual pedal feel, so that a better braking experience is provided for the user, and when the braking is finished, the compressed first elastic member 44 is reset and extended again to push the first piston 42 to the original position, so that the first piston 42 is reset.

In some embodiments, a displacement sensor is provided at the brake simulation module 4, the displacement sensor is used for detecting whether the brake simulation module 4 is displaced, and when the displacement occurs, the displacement sensor transmits a detection signal to a control unit in the driving module 2, so that the control unit drives the brake assembly to brake.

In one embodiment of the present invention, as shown in fig. 1 to 5, the screw rod 222 has a hollow passage penetrating the screw rod 222 in an axial direction thereof, a cylinder body of the piston cylinder 41 is installed in the hollow passage, a bottom wall of the piston cylinder 41 is provided with a through hole, and the brake simulation module 4 further 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 piece 44 is a spring, the spring is sleeved on the transmission rod 45, and the lower end of the transmission rod 45 extends out of the piston cylinder 41 from the through hole; the upper end of the connecting push rod 46 is fixedly connected with the transmission rod 45, and the lower end is spaced from the braking module 3 by a preset distance, wherein the connecting push rod 46 is suitable for driving the braking module 3 to brake when abutting against the braking module 3.

In the present embodiment, by arranging the piston cylinder 41 in the hollow channel of the screw rod 222, the axial occupation of the entire booster to the installation space can be effectively reduced, so that more vehicle types can be adapted, and the applicability is increased; the transmission rod 45 can provide stable support for the first elastic piece 44 and limit the radial direction of the first elastic piece 44, so that the position of the first elastic piece 44 is prevented from being misplaced and offset in the process of being compressed or reset, and the pedal feel simulation is prevented from being influenced; further, the transmission rod 45 can also drive the connection push rod 46 to move, when the driving module 2 fails, a user can tread the brake pedal to drive the connection push rod 46 to displace until the connection push rod 46 abuts against and drives the brake module 3 to brake, and when the driving module 2 is normal, due to the existence of hydraulic oil, the first piston 42 cannot continuously move, so that even if the driving module 2 fails, the driving screw rod 222 cannot be driven to drive the brake module 3 to brake, the brake simulation module 4 can also directly drive the brake module 3 to brake, the safety performance of the whole vehicle is effectively improved, and the safety of the user is protected.

In some embodiments, since the piston cylinder 41 is disposed in the hollow channel of the screw rod 222, the axial occupation of the entire booster to the installation space is reduced, and thus, the saved axial space can be used for lengthening the push rod 43, for example, as shown in fig. 2, the push rod 43 includes a fork portion and a rod portion, the hinge is performed between the rod portion and the fork portion, after the push rod 43 is lengthened, the lateral force generated by the pedaling force can be smaller, the sealing performance of the first hydraulic chamber 411 can be ensured, and the risk of generating noise is lower.

In one embodiment of the present invention, as shown in fig. 1 to 5, the linear control brake booster 100 further includes: the oil reservoir 5, the oil pipe 6, and the control valve 7 mounted on the oil pipe 6, the oil pipe 6 being communicated between the oil reservoir 5 and the first hydraulic chamber 411. In the present embodiment, the oil reservoir 5 is used to store hydraulic oil or to deliver hydraulic oil into 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, so that 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, so that when the first piston 42 extends into the first hydraulic chamber 411, hydraulic oil in the first hydraulic chamber 411 is extruded back into the oil storage tank 5, and the resistance to the first piston 42 is reduced, so that the first piston 42 can continuously move, and the connecting push rod 46 in transmission connection with the transmission rod 45 can drive the brake assembly to brake, thereby ensuring the safety of a user.

In a specific embodiment of the present invention, as shown in fig. 1 to 5, the axis of the transmission rod 45 and the axis of the connecting push rod 46 are coincident with the axis of the screw rod 222, so that the transmission efficiency can be effectively improved, the driving force loss can be reduced, and the braking flexibility can be improved.

In one embodiment of the present invention, as shown in fig. 1 to 5, the housing 1 has a second mounting hole, the brake module 3 is adapted to extend into the first mounting space through the second mounting hole, the brake module 3 includes a screw rod 222 push plate, and the screw rod 222 and the connection push rod 46 are both adapted to push the screw rod 222 push plate up and down. In this embodiment, the push plate of the screw rod 222 can provide a larger transmission area, so that both the screw rod 222 and the connecting push rod 46 can be in transmission connection with the same, and braking of the braking module 3 is more convenient.

In some embodiments, for example, as shown in fig. 2, the upper side and the lower side of the push plate of the screw rod 222 are respectively provided with a first annular groove and a second annular groove to respectively cooperate with the screw rod 222 and the transmission member of the brake module 3, and the middle part of the push plate of the screw rod 222 is also provided with a through hole so that the connecting push plate can pass through the through hole to be in transmission cooperation with the transmission member of the brake module 3.

In one embodiment of the present invention, as shown in fig. 1 to 5, the housing 1 further has a second installation space 11 and a hydraulic flow passage 12, and the second installation space 11 is provided therein with: a second piston 8 and a second elastic member 9; the second piston 8 is used for dividing the second installation space 11 into a second hydraulic cavity and a supporting cavity, and the hydraulic flow passage 12 is communicated between the second hydraulic cavity and the second installation space 11; the second elastic piece 9 is positioned in the supporting cavity, and two ends of the second elastic piece 9 are fixedly connected with the second piston 8 and the bottom wall of the supporting cavity respectively.

In this embodiment, during normal braking, the first piston 42 extends into the first hydraulic chamber 411, hydraulic oil in the first hydraulic chamber 411 is extruded into the second installation space 11 through the hydraulic flow channel 12, and pushes the second piston 8 in the second installation space 11 to move, the second piston 8 compresses the second elastic member 9, and the second elastic member 9 provides a reverse thrust, so that the pedal feel can be simulated more truly, and the user experience is better.

In one embodiment of the present invention, as shown in fig. 1 to 5, the housing 1 includes a first housing 131 and a second housing 141, the first housing 131 includes a housing body and a shell plate coupled to one side of the housing body, wherein the housing body has a second installation space 11 therein, and the second housing 141 is fixedly coupled with the shell plate to define a first installation space, so that the design is convenient for manufacturing and assembly, and at the same time, the occupation of space can be reduced.

In one embodiment of the present invention, as shown in fig. 1 to 5, a guide groove 2221 extending in the axial direction of the screw rod 222 is provided in the hollow passage, and a guide protrusion 412 is provided on the outer side wall of the piston cylinder 41, and the guide groove 2221 is engaged with the guide protrusion 412 to restrict the rotation of the screw rod 222. In this embodiment, the guide groove 2221 cooperates with the guide protrusion 412 to limit the rotation of the screw rod 222, so as to prevent the screw rod 222 from rotating during the axial movement, thereby effectively improving the transmission efficiency.

The invention also provides a vehicle with the embodiment.

According to the vehicle provided by the embodiment of the invention, by arranging the linear control power booster 100, better pedal feel can be provided, the transmission efficiency of the linear control power booster 100 is high, the braking of the vehicle is more flexible, in addition, the linear control power booster 100 occupies small space, and the installation space of the vehicle can be saved.

Other constructions and operations of the brake-by-wire booster 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A line-controlled power assist comprising:

a housing (1), the housing (1) having a first installation space;

a drive module (2), the drive module (2) being mounted in the first mounting space, the drive module (2) comprising a drive assembly (21) and a first transmission assembly (22), the drive assembly (21) comprising a rotor (211); the first transmission assembly (22) is installed in the installation cavity, the first transmission assembly (22) comprises a nut (221) and a screw rod (222), the nut (221) is coaxially arranged in the rotor (211), the nut (221) is connected with the rotor (211), and the screw rod (222) is matched with the nut (221) so that the screw rod (222) moves along the axial direction of the screw rod;

and the braking module (3) is arranged outside the shell (1) and is in transmission connection with the screw rod (222).

2. The brake-by-wire booster of claim 1, further comprising:

a brake simulation module (4), the brake simulation module (4) comprising a brake pedal;

the signal acquisition module (10), the signal acquisition module (10) comprises a sensor, the sensor is used for obtaining the braking information of the brake pedal, and the driving module (2) brakes according to the braking information.

3. Brake-by-wire booster according to claim 2, characterized in that the brake simulation module (4) further comprises:

-a piston cylinder (41), said piston cylinder (41) being mounted in said first mounting space and defining a first hydraulic chamber (411) with said housing (1);

-a first piston (42), the housing (1) further having a first mounting hole communicating with the first hydraulic chamber (411), the first piston (42) being movably mounted in the first mounting hole and being adapted to extend from the first mounting hole into the first hydraulic chamber (411);

one end of the push rod (43) is in transmission connection with the brake pedal, and the other end of the push rod (43) is in transmission connection with the first piston (42);

-a first elastic member (44), said first elastic member (44) being arranged between said first piston (42) and said piston cylinder (41).

4. A brake-by-wire booster according to claim 3, characterized in that the screw (222) has a hollow passage penetrating the screw (222) in its axial direction, the cylinder body of the piston cylinder (41) being mounted in the hollow passage, the bottom wall of the piston cylinder (41) being provided with a through hole, the brake simulation module (4) further comprising:

the transmission rod (45), the transmission rod (45) is connected to the lower end of the first piston (42), the first elastic piece (44) is a spring, the spring is sleeved on the transmission rod (45), and the lower end of the transmission rod (45) extends out of the piston cylinder (41) from the through hole;

and the upper end of the connecting push rod (46) is fixedly connected with the transmission rod (45), and the lower end of the connecting push rod (46) is spaced a preset distance from the braking module (3), wherein the connecting push rod (46) is suitable for driving the braking module (3) to brake when being abutted with the braking module (3).

5. The brake-by-wire booster of claim 4, further comprising:

-an oil reservoir (5), -an oil pipe (6) and-a control valve (7) mounted on the oil pipe (6), the oil pipe (6) being in communication between the oil reservoir (5) and the first hydraulic chamber (411).

6. The brake-by-wire booster according to claim 4, characterized in that the axis of the transmission rod (45) and the axis of the connecting push rod (46) are both coincident with the axis of the screw (222).

7. The brake-by-wire booster according to claim 4, characterized in that the housing (1) has a second mounting hole through which the brake module (3) is adapted to extend into the first mounting space, the brake module (3) comprising a screw (222) push plate, both the screw (222) and the connecting push rod (46) being adapted to push the screw (222) push plate up and down.

8. A brake-by-wire booster according to claim 3, characterized in that the housing (1) further has a second installation space (11) and a hydraulic flow channel (12), the second installation space (11) being provided with:

a second piston (8), wherein the second piston (8) is used for dividing the second installation space (11) into a second hydraulic cavity and a supporting cavity, and the hydraulic flow passage (12) is communicated between the second hydraulic cavity and the second installation space (11);

the second elastic piece (9), the second elastic piece (9) is located in the supporting cavity, and two ends of the second elastic piece (9) are fixedly connected with the second piston (8) and the bottom wall of the supporting cavity respectively.

9. The brake-by-wire booster according to claim 8, wherein the housing (1) includes a first housing (13) (1) and a second housing (14) (1), the first housing (13) (1) includes a housing body and a housing plate connected to one side of the housing body, wherein the housing body has the second installation space (11) therein, and the second housing (14) (1) is fixedly connected to the housing plate to define the first installation space.

10. The brake-by-wire booster according to claim 4, characterized in that a guide groove (2221) extending axially along the screw (222) is provided in the hollow passage, and a guide projection (412) is provided on an outer side wall of the piston cylinder (41), and the guide groove (2221) cooperates with the guide projection (412) to restrict rotation of the screw (222).