Pressure generation device for vehicle braking system

Abstract

A pressure generation device for a vehicle braking system, comprising: a motor (1), a hydraulic control valve block (3), a cylinder (3), a piston (4), an anti-rotation sleeve (5), a nut (6), a lead screw (7), a motor rotor (8), a sliding block (9), and a hydraulic cavity (10). The motor rotor is fixedly connected to one end of the lead screw by means of the nut; the motor is fixedly connected to the hydraulic control valve block; the cylinder is axially inserted into a cylindrical hole of the hydraulic control valve block and fixed; the piston is axially inserted into the cylinder; one end of the piston is fixedly connected to the nut; a mounting hole is formed in the radial direction of the nut, and the sliding block is mounted on the mounting hole of the nut; convex ribs (11) are provided on the anti-rotation sleeve, grooves (12) are formed in the sliding block, the convex ribs are in mating contact with the grooves, and the sliding block can linearly slide along the axial direction of the convex ribs; and one end of the anti-rotation sleeve is fixedly connected to the cylinder. According to the present application, the coaxiality deviation of the anti-rotation sleeve, the cylinder and the piston can be reduced, and the problem caused by welding of flat keys and the nut is solved.

Description

A pressure generating device for a 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 generating device 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 anti-rotation sleeve is riveted to the hydraulic control valve block by pins, which will cause a large coaxial deviation between the anti-rotation sleeve and the cylinder body and piston; the connection and fixing process between the flat key and the nut is poor, and the welding process usually used will cause the flat key to loosen due to weld cracking; and the existing nut anti-rotation structure has a large number of parts, the assembly process is difficult to control, and the manufacturing cost is high. Summary of the Invention

[0006] In view of this, an embodiment of the present application provides a pressure generating device for a vehicle braking system, which can at least solve the aforementioned technical problems.

[0007] According to an embodiment of the present application, a pressure generating device for a vehicle braking system is provided, the device comprising: a motor, a hydraulic control valve block, a cylinder, a piston, an anti-rotation sleeve, a nut, a lead screw, a motor rotor, and a slider; wherein the motor rotor is fixedly connected to one end of the lead screw with a nut; 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 chamber; one end of the piston is fixedly connected to the nut; a mounting hole is provided in the radial direction of the nut, and the slider is installed on the mounting hole of the nut to limit the rotation of the nut; a rib is provided on the anti-rotation sleeve, and a groove is provided on the slider, the rib is in mating contact with the groove, and the slider can slide linearly along the axial direction of the rib; one end of the anti-rotation sleeve is fixedly connected to the cylinder.

[0008] In some exemplary embodiments, the groove portion of the slider is provided with a sink groove arranged along the axial direction of the groove, and the sink groove constitutes an oil storage tank.

[0009] In some exemplary embodiments, the oil reservoir is used to store grease.

[0010] In some exemplary embodiments, one end of the anti-rotation sleeve is fixedly connected to the cylinder body through a spline interference connection or welding, and the central axis of the anti-rotation sleeve coincides with the central axis of the cylinder body.

[0011] In some exemplary embodiments, the central axis of the motor rotor coincides with the central axis of the lead screw.

[0012] In some exemplary embodiments, the cylinder is axially inserted into the cylindrical hole of the hydraulic control valve block and fixed by using a cylindrical interference connection or a spline interference connection.

[0013] In some exemplary embodiments, one end of the piston is fixedly connected to the nut by a cylindrical interference connection or a threaded connection.

[0014] In the embodiment of the present application, the anti-rotation sleeve is directly fixed on the cylinder body, which is beneficial to improving the assembly accuracy of the anti-rotation sleeve, the cylinder body and the piston, and effectively reducing the coaxiality deviation of the anti-rotation sleeve, the cylinder body and the piston; the traditional flat key design is eliminated, and an anti-rotation slider with a concave structure is adopted, and the anti-rotation slider is directly installed on the nut, which solves the problem caused by welding the flat key and the nut; an anti-rotation slider with an oil storage tank structure is adopted to improve the long-term lubrication effect between the friction pair of the slider and the anti-rotation sleeve, and improve the problem of grease loss between the friction pairs of the existing slider structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] FIG1 shows a schematic structural diagram of a pressure generating device for a vehicle braking system according to an embodiment of the present application.

[0017] FIG2 shows a partially enlarged structural schematic diagram of a pressure generating device for a vehicle braking system according to an embodiment of the present application.

[0018] FIG3 shows a schematic cross-sectional view of an enlarged portion of the structure AA of a pressure generating device for a vehicle braking system according to an embodiment of the present application.

[0019] FIG4 shows a schematic structural diagram of an oil storage tank of a pressure generating device for a vehicle braking system according to an embodiment of the present application.

[0020] Explanation of the drawing numbers: Motor 1, hydraulic control valve block 2, cylinder 3, piston 4, anti-rotation sleeve 5, nut 6, lead screw 7, motor rotor 8, slider 9, hydraulic chamber 10, rib 11, groove 12, oil storage tank 13. DETAILED DESCRIPTION

[0021] 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.

[0022] The essence of the technical solution of the embodiment of the present application is explained in detail below with reference to the accompanying drawings.

[0023] The present application provides a pressure generating device for a vehicle braking system. Figure 1 is a schematic structural diagram of the pressure generating device for a vehicle braking system according to the present application. As shown in Figure 1, the pressure generating device for a vehicle braking system according to the present application comprises: a motor 1, a hydraulic control valve block 2, a cylinder 3, a piston 4, an anti-rotation sleeve 5, a nut 6, a lead screw 7, a motor rotor 8, a slider 9, and a hydraulic chamber 10.

[0024] The motor rotor 8 is fixedly connected to one end of the lead screw 7 by a nut 6 , and the central axis of the motor rotor 8 coincides with the central axis of the lead screw 7 .

[0025] The motor 1 is fixedly connected to the hydraulic control valve block 2 , for example, by bolts.

[0026] The cylinder body 3 is axially inserted into the cylindrical hole of the hydraulic control valve block 2 and fixed; in the embodiment of the present application, the cylinder body 3 is axially inserted into the cylindrical hole of the hydraulic control valve block 2 and fixed by a cylindrical interference connection or a spline interference connection.

[0027] The piston 4 is axially inserted into the cylinder 3 , and the outer surface of the front end of the piston 4 and the inner surface of the cylinder 3 form a closed hydraulic chamber 10 .

[0028] One end of the piston 4 is fixedly connected to the nut 6; in the embodiment of the present application, one end of the piston 4 is fixedly connected to the nut 6 by a cylindrical interference connection or a threaded connection.

[0029] In the embodiment of the present application, the screw 7, nut 6 and balls constitute a ball screw pair.

[0030] Figure 2 is a partially enlarged schematic diagram of the pressure generating device for a vehicle braking system according to an embodiment of the present application. As shown in Figure 2, a mounting hole is provided in the radial direction of the nut 6, and the slider 9 is mounted on the mounting hole of the nut 6 to limit the rotation of the nut 6.

[0031] FIG3 is a schematic diagram of a partially enlarged cross-sectional view of the AA section of the pressure generating device for a vehicle braking system according to an embodiment of the present application. As shown in FIG3 , a rib 11 is provided on the anti-rotation sleeve 5, and a groove 12 is provided on the slider 9. The rib 11 is in contact with the groove 12, and the slider 9 can slide linearly along the axial direction of the rib 11. The slider 9 can be provided in a plurality of positions, and accordingly, the mounting holes of the nut 6 can be provided in a plurality of positions. The plurality of mounting holes of the nut 6 are arranged at uniform intervals along the circumferential direction of the nut 6, and the plurality of sliders 9 are respectively installed in the plurality of mounting holes of the nut 6. In the embodiment of the present application, as shown in FIG3 , the number of sliders 9 is three, but the present application is not limited thereto.

[0032] Figure 4 is a schematic diagram of the oil reservoir structure of the pressure generating device for a vehicle brake system according to an embodiment of the present application. As shown in Figure 4 , the groove 12 of the slider 9 is provided with a recessed groove arranged axially along the groove 12 , which forms an oil reservoir 13 for storing grease.

[0033] In an embodiment of the present application, one end of the anti-rotation sleeve 5 is fixedly connected to the cylinder body 3; in an embodiment of the present application, one end of the anti-rotation sleeve 5 is fixedly connected to the cylinder body 3 by a spline interference connection or welding, and the central axis of the anti-rotation sleeve 5 coincides with the central axis of the cylinder body 3.

[0034] In the embodiment of the present application, motor 1 serves as a hydraulically generated power source. Motor 1 drives screw 7 to rotate according to instructions from the brake booster control unit. Screw 7 rotates, driving nut 6 to perform linear translational motion. The ball screw assembly thus converts the rotational motion of screw 7 into linear motion of nut 6. Nut 6 drives piston 4 to perform reciprocating linear motion within the cylindrical bore of cylinder 3, compressing the brake fluid within hydraulic chamber 10. The high-pressure brake fluid is distributed to the wheel cylinders of each wheel through hydraulic control valve block 2, generating braking force. Ribs 11 provided on anti-rotation sleeve 5 position slider 9 for linear translational motion. Slider 9, mounted on nut 6, restricts its rotation, causing it to perform linear motion.

[0035] The pressure generating device for a vehicle braking system described in the embodiment of the present application directly fixes the anti-rotation sleeve on the cylinder body, which is beneficial to improving the assembly accuracy of the anti-rotation sleeve, the cylinder body and the piston, and effectively reducing the coaxiality deviation of the anti-rotation sleeve, the cylinder body and the piston; the traditional flat key design is eliminated, and an anti-rotation slider with a concave structure is adopted, and the anti-rotation slider is directly installed on the nut, which solves the problem caused by welding and fixing the flat key and the nut; an anti-rotation slider with an oil storage tank structure is adopted to improve the long-term lubrication effect between the friction pair of the slider and the anti-rotation sleeve, and improve the problem of grease loss between the friction pairs of the existing slider structure.

[0036] 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 various embodiments of the present invention, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process 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 serial numbers of the embodiments of the present application mentioned above are for description only and do not represent the advantages and disadvantages of the embodiments.

[0037] 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.

[0038] In the embodiments provided herein, it should be understood that the disclosed devices and methods may be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is merely a logical functional division. In actual implementation, other division methods may be used, such as combining multiple units or components, integrating them into another system, or omitting or omitting some features.

[0039] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present application.

[0040] 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 generating device for a vehicle braking system, characterized in that: The device comprises: a motor, a hydraulic control valve block, a cylinder, a piston, an anti-rotation sleeve, a nut, a lead screw, a motor rotor, and a slider; wherein, The motor rotor is fixedly connected to one end of the lead screw by a nut; the motor is fixedly connected to the hydraulic control valve block; the cylinder body is axially inserted into the cylindrical hole of the hydraulic control valve block and fixed; the piston is axially inserted into the cylinder body, and the outer surface of the front end of the piston and the inner surface of the cylinder body form a closed hydraulic cavity; one end of the piston is fixedly connected to the nut; A mounting hole is provided in the radial direction of the nut, and the slider is installed on the mounting hole of the nut to limit the rotation of the nut; a convex rib is provided on the anti-rotation sleeve, and a groove is provided on the slider, the convex rib is in contact with the groove, and the slider can slide in a straight line along the axial direction of the convex rib; one end of the anti-rotation sleeve is fixedly connected to the cylinder body.

2. The pressure generating device for a vehicle braking system according to claim 1, characterized in that: The groove portion of the sliding block is provided with a sink groove arranged along the axial direction of the groove, and the sink groove constitutes an oil storage groove.

3. The pressure generating device for a vehicle braking system according to claim 2, characterized in that: The oil storage tank is used for storing grease.

4. The pressure generating device for a vehicle brake system according to any one of claims 1 to 3, characterized in that: One end of the anti-rotation sleeve is fixedly connected to the cylinder body through a spline interference connection or welding, and the central axis of the anti-rotation sleeve coincides with the central axis of the cylinder body.

5. The pressure generating device for a vehicle brake system according to any one of claims 1 to 3, characterized in that: The central axis of the motor rotor coincides with the central axis of the lead screw.

6. The pressure generating device for a vehicle brake system according to any one of claims 1 to 3, characterized in that: The cylinder body is axially inserted into the cylindrical hole of the hydraulic control valve block and fixed by a cylindrical interference connection or a spline interference connection.

7. The pressure generating device for a vehicle brake system according to any one of claims 1 to 3, characterized in that: One end of the piston is fixedly connected with a nut by a cylindrical interference connection or a threaded connection.

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