Pressure buildup structure for vehicle brake system

Abstract

A pressure buildup structure for a vehicle brake system. An electric motor (1) is fixedly connected to a hydraulic control valve block (2); a cylinder body (3) is axially inserted and fixed in a cylindrical hole of the hydraulic control valve block (2); a piston (4) is axially inserted into the cylinder body (3); a support ring (5) is sleeved on an annular groove of the piston (4); one end of the piston (4) is fixedly connected to a lead screw (6); an anti-rotation sliding block (12) is fixedly connected to the lead screw (6); an anti-rotation sleeve (16) mates with and is in contact with the anti-rotation sliding block (12); the anti-rotation sleeve (16) is axially inserted into a mounting hole in a rear end of an electric motor housing (15), and the anti-rotation sleeve (16) is connected to the electric motor housing (15) in an embedded manner; the anti-rotation sleeve (16) fits against and is in contact with an inner hole wall of an electric motor rotor (11), and a locking screw plug (14) presses an elastic gasket (13) against an end of the anti-rotation sleeve (16); and a nut (10) is axially inserted into an inner hole of the electric motor rotor (11), a clamping cushion block (17) is mounted on an inner hole wall of the electric motor rotor (11), the clamping cushion block (17) fits against the nut (10), a gasket (8) is mounted between the nut (10) and an elastic retaining ring (7), and one end of the elastic retaining ring (7) is retained in the electric motor rotor (11). The problems of an existing braking system having a complex structure, high costs and large noise are solved.

Description

A pressure building structure for vehicle braking system Technical Field

[0001] The embodiments of the present application relate to the field of vehicle braking technology, and in particular to a pressure building structure for a vehicle braking system. Background Art

[0002] At present, electric brake boosters have been widely used in traditional fuel vehicles, especially new energy vehicles. Compared with traditional vacuum boosters, electric brake boosters no longer require a vacuum source and rely entirely on motors to provide braking assistance. Replacing vacuum boosters has become an inevitable trend.

[0003] With the development of electrification and intelligent driving technologies, intelligent integrated braking systems have become a new trend. These systems combine the anti-lock braking system (ABS) / electronic stability control (ESC) with an electric brake booster system to create a one-box solution. This system not only performs the functions of a booster, but also provides anti-lock braking and vehicle stability control. The integrated brake booster primarily consists of a hydraulic control valve block, a foot-feel simulator, a pressure generator, a control unit, a sensor, and a drive motor.

[0004] The existing technical solution is to use a motor to drive the screw to rotate, the screw drives the nut to perform linear translational motion, the nut drives the piston to perform reciprocating linear motion in the cylinder, and the piston compresses the brake fluid in the cylinder to generate hydraulic pressure. The screw, nut and balls constitute a ball screw pair, which can convert the rotational motion of the screw into the linear translational motion of the nut. The current technology is to press-rivet the anti-rotation sleeve on the hydraulic control valve block with a pin. The anti-rotation sleeve is provided with a concave groove. Two flat keys are symmetrically welded on the nut of the ball screw pair. The slider is installed on the flat key. The nut is inserted into the anti-rotation sleeve. The slider is placed in the concave groove of the anti-rotation sleeve and can slide linearly, thereby limiting the rotation of the nut and achieving linear translational motion of the nut.

[0005] The lock nut secures the motor rotor, lead screw, and stop washer together and rotates with the motor rotor. Forward movement of the nut and piston generates hydraulic pressure, while backward movement releases pressure. When the nut moves backward, it contacts the stop washer, returning the nut and piston to their original position and the motor stops.

[0006] When the nut and the piston return to their original positions, the stop washer and the nut rotate relative to each other, causing the nut and the stop washer to lock, making it difficult to start the motor again; and noise is generated when the nut and the stop washer collide and separate; and the existing nut anti-rotation structure has a large number of parts, the assembly process is difficult to control, and the cost is high.

[0007] Currently, planetary gears can be used to decelerate and increase the torque output of the motor, and a ball screw is used to convert the gear's rotational motion into linear translational motion, driving the piston to generate hydraulic pressure. However, the transmission mechanism of current planetary gear hydraulic pressure generating devices is complex and costly. In addition, the piston of the hydraulic pressure generating device uses a circumferential stop on the screw or nut to return to the origin, which also generates noise when the screw and nut clash. Summary of the Invention

[0008] In view of this, an embodiment of the present application provides a pressure building structure for a vehicle braking system, which can at least solve the aforementioned technical problems.

[0009] According to an embodiment of the present application, a pressure-building structure for a vehicle brake system is provided, the structure comprising: a motor, a hydraulic control valve block, a cylinder, a piston, a support ring, a lead screw, an elastic retaining ring, a washer, a nut, a motor rotor, an anti-rotation slider, an elastic gasket, a locking screw plug, a motor housing, an anti-rotation sleeve, and a clamping pad; wherein the motor is fixedly connected to the hydraulic control valve block; the cylinder is axially inserted into the cylindrical hole of the hydraulic control valve block and fixed; the piston is axially inserted into the cylinder, and the outer surface of the front end of the piston and the inner surface of the cylinder body form a closed hydraulic cavity; the support ring is sleeved on the ring groove set on the piston; the piston ... The end is fixedly connected to the screw; the anti-rotation slider is fixedly connected to the screw; the anti-rotation sleeve is in contact with the anti-rotation slider; the anti-rotation sleeve is axially inserted into the mounting hole at the rear end of the motor housing, and the anti-rotation sleeve is embedded in the motor housing; the anti-rotation sleeve is in contact with the inner hole wall of the motor rotor, and the locking screw presses the elastic gasket against the end of the anti-rotation sleeve; the nut is axially inserted into the inner hole of the motor rotor, the clamping pad is installed on the inner hole wall of the motor rotor, the clamping pad is in contact with the nut, the washer is installed between the nut and the elastic retaining ring, and is in contact with the end faces of the nut and the elastic retaining ring, and one end of the elastic retaining ring is stuck in the motor rotor.

[0010] In some exemplary embodiments, the outer circumferential surface of the support ring is in close contact with the inner wall of the cylinder body, and there is a gap between the outer circumferential surface of the piston and the inner wall of the cylinder body.

[0011] In some exemplary embodiments, one end of the piston is fixedly connected to the lead screw via a cylindrical interference connection or a threaded connection.

[0012] In some exemplary embodiments, the anti-rotation slider is fixedly connected to the lead screw via a spline interference connection or a threaded connection.

[0013] In some exemplary embodiments, the anti-rotation sleeve is provided with a rib, and the anti-rotation slider is provided with a second groove. The rib is in cooperative contact with the second groove, and the anti-rotation slider can slide linearly along the axial direction of the rib.

[0014] In some exemplary embodiments, a first protrusion is provided on the anti-rotation sleeve, a first groove is provided on the motor housing, and the first protrusion is embedded in the first groove.

[0015] In some exemplary embodiments, second protrusions are evenly arranged on the outer circumference of the anti-rotation sleeve, and the second protrusions are in close contact with the inner hole wall of the motor rotor.

[0016] In some exemplary embodiments, the clamping block is provided with a third protrusion; and the third protrusion of the clamping block is embedded in the opening of the motor rotor.

[0017] In some exemplary embodiments, the outer circumference of the nut is evenly provided with planar surfaces, and the planar portion of the clamping block fits in with the planar surface of the nut.

[0018] In some exemplary embodiments, the motor rotor is provided with an annular groove, and one end of the circlip is clamped in the annular groove of the motor rotor.

[0019] In the embodiment of the present application, the motor rotor is anti-torsional coupled to the nut of the ball screw pair, and the anti-rotation sleeve is anti-torsional coupled to the motor housing. The screw can move linearly relative to the motor housing without rotation. When the screw and / or piston return to the origin, they are positioned and stopped by the motor housing or a plug cover fixed thereto. A shock-absorbing gasket is arranged between the motor housing and the screw to reduce noise. The anti-rotation sleeve can support the motor rotor in relative rotation with the motor rotor, replacing the use of ball bearings and reducing costs. A support ring is provided on the piston to prevent friction between the piston and the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0021] FIG1 shows a schematic diagram of a pressure building structure for a vehicle braking system according to an embodiment of the present application.

[0022] FIG2 shows an AA cross-sectional view of a pressure-building structure for a vehicle braking system according to an embodiment of the present application.

[0023] FIG3 shows a schematic diagram of a partial structure of a pressure building structure for a vehicle braking system according to an embodiment of the present application.

[0024] FIG4 shows a BB cross-sectional view of a partial structure of a pressure-building structure for a vehicle braking system according to an embodiment of the present application.

[0025] FIG5 shows a CC cross-sectional view of a partial structure of a pressure-building structure for a vehicle braking system according to an embodiment of the present application.

[0026] Explanation of the figure numbers: Sealing ring 0, motor 1, hydraulic control valve block 2, cylinder body 3, piston 4, support ring 5, screw 6, circlip 7, washer 8, ball bearing 9, nut 10, motor rotor 11, anti-rotation slider 12, elastic gasket 13, locking screw plug 14, motor housing 15, anti-rotation sleeve 16, clamping pad 17, hydraulic chamber 18, first groove 19, first protrusion 20, rib 21, annular groove 22, second protrusion 23, second groove 24, third protrusion 25, flat surface 26. DETAILED DESCRIPTION

[0027] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0028] The essence of the technical solution of the embodiment of the present application is explained in detail below with reference to the accompanying drawings.

[0029] Figure 1 shows a schematic diagram of a pressure-building structure for a vehicle brake system according to an embodiment of the present application. As shown in Figure 1, the pressure-building structure for a vehicle brake system according to an embodiment of the present application comprises: a motor 1, a hydraulic control valve block 2, a cylinder 3, a piston 4, a support ring 5, a lead screw 6, an elastic retaining ring 7, a washer 8, a ball bearing 9, a nut 10, a motor rotor 11, an anti-rotation slider 12, an elastic washer 13, a locking screw plug 14, a motor housing 15, an anti-rotation sleeve 16, a clamping pad 17, a hydraulic chamber 18, and a sealing ring 0.

[0030] The motor 1 is fixedly connected to the hydraulic control valve block 2, for example, by bolts; the cylinder body 3 is axially inserted into the cylindrical hole of the hydraulic control valve block 2 and fixed; the piston 4 is axially inserted into the cylinder body 3, and the outer surface of the front end of the piston 4 and the inner surface of the cylinder body 3 form a closed hydraulic chamber 18; the support ring 5 is sleeved on the ring groove set on the piston 4, and the outer cylindrical surface of the support ring 5 is in contact with the inner hole wall of the cylinder body 3, and there is a gap between the outer cylindrical surface of the piston 4 and the inner hole wall of the cylinder body 3; one end of the piston 4 is fixedly connected to the screw 6, for example, one end of the piston 4 is fixedly connected to the screw 6 by a cylindrical interference fit or a threaded connection; the screw 6, the nut 10 and the ball constitute a ball screw pair.

[0031] The anti-rotation slider 12 is fixedly connected to the screw 6, for example, the anti-rotation slider 12 is fixedly connected to the screw 6 by a spline interference connection or a threaded connection; the anti-rotation sleeve 16 is in mating contact with the anti-rotation slider 12; the anti-rotation sleeve 16 is axially inserted into the mounting hole at the rear end of the motor housing 15, and the anti-rotation sleeve 16 is embedded in the motor housing 15; the anti-rotation sleeve 16 is in fit contact with the inner hole wall of the motor rotor 11, and the locking screw plug 14 presses the elastic gasket 13 against the end of the anti-rotation sleeve 16.

[0032] The nut 10 is axially inserted into the inner hole of the motor rotor 11. The clamping pad 17 is installed on the inner hole wall of the motor rotor 11. The clamping pad 17 is in contact with the nut 10. The washer 8 is installed between the nut 10 and the elastic circlip 7 and in contact with the end faces of the nut 10 and the elastic circlip 7. One end of the elastic circlip 7 is stuck in the motor rotor 11. In addition, the sealing ring 0 is sleeved on the head of the piston 4 to seal the hydraulic chamber 18.

[0033] FIG2 is an AA cross-sectional view of a pressure-building structure for a vehicle brake system according to an embodiment of the present application. As shown in FIG2 , a first protrusion 20 is provided on the anti-rotation sleeve 16, and a first groove 19 is provided on the motor housing 15; the anti-rotation sleeve 16 and the motor housing 15 are embedded in each other, including: the first protrusion 20 of the anti-rotation sleeve 16 is embedded in the first groove 19 of the motor housing 15. The anti-rotation sleeve 16 may be provided with a plurality of first protrusions 20, and correspondingly, the motor housing 15 may be provided with a plurality of first grooves 19. The plurality of first grooves 19 are arranged at uniform intervals along the circumferential direction of the motor housing 15, and the plurality of first protrusions 20 are respectively embedded in the plurality of first grooves 19. In the embodiment of the present application, as shown in FIG2 , the number of the first protrusions 20 is three, but the present application is not limited thereto.

[0034] Figure 3 is a schematic diagram of a partial structure of a pressure-building structure for a vehicle brake system according to an embodiment of the present application. As shown in Figure 3 , the motor rotor 11 is provided with an annular groove 22 ; the circlip 7 having one end engaged with the motor rotor 11 includes: The circlip 7 having one end engaged with the annular groove 22 of the motor rotor 11 .

[0035] Figure 4 is a cross-sectional view taken along line BB of a partial structure of a pressure-building structure for a vehicle brake system according to an embodiment of the present application. As shown in Figure 4 , the anti-rotation sleeve 16 is uniformly provided with second protrusions 23 on its outer circumference. The contact between the anti-rotation sleeve 16 and the inner wall of the motor rotor 11 includes: The second protrusions 23 of the anti-rotation sleeve 16 are in contact with the inner wall of the motor rotor 11.

[0036] The anti-rotation sleeve 16 is provided with a rib 21, and the anti-rotation slider 12 is provided with a second groove 24. The anti-rotation sleeve 16 and the anti-rotation slider 12 are matingly contacted, wherein the rib 21 of the anti-rotation sleeve 16 is matingly contacted with the second groove 24 of the anti-rotation slider 12, and the anti-rotation slider 12 is able to slide linearly along the rib 21. The anti-rotation sleeve 16 can be provided with multiple ribs 21, and accordingly, the anti-rotation slider 12 can be provided with multiple second grooves 24. The multiple second grooves 24 are arranged at even intervals along the circumferential direction of the anti-rotation slider 12, and the multiple ribs 21 are matingly contacted with the multiple second grooves 24, respectively. In the embodiment of the present application, as shown in FIG. 4 , the number of ribs 21 is three, but the present application is not limited thereto.

[0037] Figure 5 is a CC cross-sectional view of a partial structure of a pressure-building structure for a vehicle brake system according to an embodiment of the present application. The clamping pad 17 is provided with a third protrusion 25; the third protrusion 25 of the clamping pad 17 is embedded in the opening of the motor rotor 11. The clamping pad 17 can be provided in multiple numbers, and accordingly, the motor rotor 11 can be provided with multiple openings. The multiple openings of the motor rotor 11 are arranged at uniform intervals along the circumferential direction of the motor rotor 11, and the third protrusions 25 of the multiple clamping pads 17 are respectively embedded in the multiple openings of the motor rotor 11. In the embodiment of the present application, as shown in Figure 5, the number of the clamping pads 17 is three, but the present application is not limited thereto.

[0038] The outer circumference of the nut 10 is evenly provided with a planar surface 26 , and the clamping block 17 is fitted with the nut 10 , including: the planar portion of the clamping block 17 is fitted with the planar surface 26 of the nut 10 .

[0039] In the embodiment of the present application, the motor 1 is a power source generated by hydraulic pressure, the clamping pad 17 combines the nut 10 and the motor rotor 11 together in a torsionally rigid manner, and the elastic retaining ring 7 axially fixes the nut 10 and the motor rotor 11; the motor 1 drives the nut 10 to rotate, and the rotation of the nut 10 drives the screw 6 to perform linear translational motion, and the screw 6 drives the piston 4 to perform reciprocating linear motion in the cylindrical hole of the cylinder body 3. The support ring 5 prevents the piston 4 from rubbing against the inner hole wall of the cylinder body 3; the rib 21 provided on the anti-rotation sleeve 16 positions the anti-rotation slider 12 so that it moves linearly, and the anti-rotation slider 12 is installed on the screw 6 to limit the rotation of the screw 6, so that the screw 6 moves linearly; the first protrusion 20 provided on the anti-rotation sleeve 16 is embedded in the first groove 19 provided on the motor housing 15, so that the anti-rotation sleeve 16 and the motor housing 15 are torsionally and axially fixed; the second protrusion 23 provided on the anti-rotation sleeve 16 is in contact with the inner hole wall of the motor rotor 11, so that the anti-rotation sleeve 16 can support the motor rotor 11 relative to the motor rotor 11; when the piston 4 and / or the screw 6 retreat, the screw 6 abuts against the elastic gasket 13, so that the screw 6 is positioned at the origin.

[0040] The motor 1 drives the nut 10 to rotate according to the instructions issued by the brake booster control unit. The ball screw pair converts the rotational motion of the nut 10 into the linear motion of the screw 6. The screw drives the piston 4 to compress the brake fluid in the hydraulic chamber 18. The high-pressure brake fluid is controlled by the hydraulic control valve block 2 and distributed to the brake wheel cylinders of each wheel to generate braking force.

[0041] In the embodiment of the present application, the ball screw pair can be replaced by a planetary roller screw, the piston and the screw can be made into one piece, or the anti-rotation slider and the screw can be made into one piece, etc.

[0042] Unlike the traditional technical solution in which the piston and cylinder body adopt the shaft sealing method, the piston and cylinder body in the embodiment of the present application adopt the hole sealing method, and the support ring plays a role in reducing the wear of the piston and the cylinder body, ensuring that the piston and the cylinder body are coaxial; the transmission scheme disclosed in the embodiment of the present application is that the motor rotor drives the nut to rotate, and the nut drives the screw to make a linear motion; the elastic retaining ring and the nut are relatively stationary, and the elastic retaining ring fixes the nut; the elastic gasket is fixed to the motor housing, and the elastic gasket and the screw do not rotate relative to each other, which limits the return stroke of the screw and solves the problem of locking the nut return stroke; and in the embodiment of the present application, the locking screw plug does not fix the screw and the motor rotor, but only fixes the motor housing and the elastic gasket; the piston is fixedly connected to the screw, and the piston is fixed to one end of the screw; the anti-rotation sleeve is sleeved on the outer periphery of the screw to prevent the screw from rotating.

[0043] In summary, in the technical solutions described in the embodiments of the present application, the piston and cylinder body adopt a hole sealing method, the sealing ring set on the piston head plays a sealing role, and the support ring set on the piston tail plays a supporting and wear-reducing role; the ball screw pair adopts a nut rotation and a linear motion of the screw; the motor rotor and nut are torsion-resistant and axially fixed, and are relatively stationary; the elastic gasket is fixed to the motor housing, and the elastic gasket limits the return stroke of the screw. There is no relative rotation between the elastic gasket and the screw, and contact and separation can be achieved without any friction resistance; the anti-rotation sleeve is used to prevent the screw from rotating. A specific structure set on the outer circumference of the anti-rotation sleeve supports the rear end of the motor rotor and plays the role of supporting the bearing. The corresponding motor cancels the rear end bearing; the nut is set at the front end of the motor, and it is the front end bearing of the motor that bears the axial load of the piston, because the force point generated by the hydraulic pressure is at the piston head, and the support point of the reaction force is the front end bearing or nut. The technical solutions described in the embodiments of the present application make the distance between the force point of the piston axial force and the support point of the reaction force shorter, so that the overall rigidity of the ball screw and the piston is better, more stable during operation, and less vibration.

[0044] The pressure-building structure for a vehicle braking system of the present invention has a motor rotor and a nut of a ball screw pair that are torsionally coupled, an anti-rotation sleeve and a motor housing that are torsionally coupled, the screw can move linearly relative to the motor housing without rotation, and the screw and / or piston are positioned and stopped by the motor housing or a plug cover (e.g., a locking screw) fixed thereto when returning to the origin. A shock-absorbing gasket (e.g., an elastic gasket) is provided between the motor housing and the screw to reduce noise; the anti-rotation sleeve can support the motor rotor in relative rotation with the motor rotor, replacing the use of ball bearings and reducing costs; a support ring is provided on the piston to prevent friction between the piston and the cylinder body.

[0045] In summary, the technical solution described in the embodiments of the present application adopts a completely new layout and structure, which solves the problems existing in the existing solutions, simplifies the structure and reduces costs.

[0046] It should be understood that “one embodiment” or “an embodiment” mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, “in one embodiment” or “in an embodiment” appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present invention, the size of the above-mentioned serial numbers does not mean the order of position, and the position of each component should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments.

[0047] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0048] The above description is merely an embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A pressure building structure for a vehicle braking system, characterized in that: The structure includes: a motor, a hydraulic control valve block, a cylinder, a piston, a support ring, a lead screw, an elastic retaining ring, a washer, a nut, a motor rotor, an anti-rotation slider, an elastic gasket, a locking screw plug, a motor housing, an anti-rotation sleeve, and a clamping pad; wherein, The motor is fixedly connected to the hydraulic control valve block; the cylinder is axially inserted into the cylindrical hole of the hydraulic control valve block and fixed; the piston is axially inserted into the cylinder, and the outer surface of the front end of the piston and the inner surface of the cylinder body form a closed hydraulic cavity; the support ring is sleeved on the ring groove set on the piston; one end of the piston is fixedly connected to the lead screw; The anti-rotation slider is fixedly connected to the lead screw; the anti-rotation sleeve is in contact with the anti-rotation slider; the anti-rotation sleeve is axially inserted into the mounting hole at the rear end of the motor housing, and the anti-rotation sleeve is embedded in the motor housing; the anti-rotation sleeve is in contact with the inner hole wall of the motor rotor, and the locking screw plug presses the elastic gasket against the end of the anti-rotation sleeve; The nut is axially inserted into the inner hole of the motor rotor, the clamping pad is installed on the inner hole wall of the motor rotor, the clamping pad is fitted with the nut, the washer is installed between the nut and the elastic retaining ring, and fits with the end faces of the nut and the elastic retaining ring, and one end of the elastic retaining ring is stuck in the motor rotor.

2. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The outer circumferential surface of the support ring is in close contact with the inner hole wall of the cylinder body, and there is a gap between the outer circumferential surface of the piston and the inner hole wall of the cylinder body.

3. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: One end of the piston is fixedly connected to the lead screw through a cylindrical interference connection or a threaded connection.

4. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The anti-rotation sliding block is fixedly connected to the lead screw through a spline interference connection or a threaded connection.

5. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The anti-rotation sleeve is provided with a convex rib, and the anti-rotation slider is provided with a second groove. The convex rib is in cooperative contact with the second groove, and the anti-rotation slider can slide linearly along the axial direction of the convex rib.

6. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The anti-rotation sleeve is provided with a first protrusion, the motor housing is provided with a first groove, and the first protrusion is embedded in the first groove.

7. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The outer circumference of the anti-rotation sleeve is evenly provided with second protrusions, and the second protrusions are in close contact with the inner hole wall of the motor rotor.

8. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The clamping pad is provided with a third protrusion; the third protrusion of the clamping pad is embedded in the opening of the motor rotor.

9. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The outer circumference of the nut is evenly provided with planar surfaces, and the planar portion of the clamping pad is in contact with the planar surface of the nut.

10. The pressure building structure for a vehicle braking system according to claim 1, characterized in that: The motor rotor is provided with an annular groove, and one end of the elastic retaining ring is clamped in the annular groove of the motor rotor.

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