Pressure buildup unit of brake system

Abstract

The utility model discloses a voltage buildup unit of a braking system, and relates to the technical field of vehicle braking. Comprising a valve block, a motor and a lead screw assembly. The valve block is provided with a pressure buildup part and an anti-rotation part which are coaxial, the interiors of the pressure buildup part and the anti-rotation part are of hollow structures, a pressure buildup cavity and an anti-rotation cavity which correspond to each other are formed, the pressure buildup cavity is communicated with the anti-rotation cavity, and a piston which is in sliding sealing connection with the pressure buildup cavity is arranged in the pressure buildup cavity; the lead screw assembly comprises a nut and a lead screw, the nut and the lead screw are located in the anti-rotation cavity, the nut is in driving connection with the piston, and the anti-rotation part is matched with the nut to prevent the nut from moving in the circumferential direction; and one part of the lead screw extends out of the anti-rotation cavity and is in driving connection with a motor. The PSU flange and the anti-rotation piece are integrated on the valve block, more connecting parts do not need to be arranged, the assembling process is simple, the assembling efficiency is high, product failure caused by O-shaped ring failure is avoided, the number of assembled sample pieces is reduced, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle brake technical field, especially a kind of build pressure unit of brake system. BACKGROUND

[0002] EHB (electronic hydraulic brake system) is a comprehensive brake assembly, which is composed of PSU build pressure unit, ECU controller, pedal feeling simulation unit, master cylinder and other components, and the PSU build pressure unit includes motor, ball screw, PSU flange, PSU piston and the like.

[0003] The current implementation mode of the PSU build pressure unit is that the motor rotates to drive the ball screw to move, and then the hydraulic piston is driven by the ball screw to build pressure. Among them, the ball screw can convert the rotary motion of the motor into linear motion and output. In order to ensure the linear motion of the ball screw nut, an anti-rotation member needs to be additionally provided, which cooperates with the ball screw nut and is fixed to the valve block by screws. The ball screw nut is threadedly connected with the PSU piston, and the linear motion of the ball screw nut drives the piston to move together. The piston moves in the PSU flange cavity to build pressure, and the PSU flange and the valve block need to be sealed by an O-ring.

[0004] The structure of the above-mentioned mode is relatively complex, there are many matching relationships and differences in the sizes of parts, which affects the assembly effect and increases the sliding friction, resulting in low build pressure efficiency. UTILITY MODEL CONTENTS

[0005] The utility model mainly aims at providing a build pressure unit of brake system to solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the utility model provides a build pressure unit of brake system, which comprises a valve block, a motor and a screw assembly. The valve block has a build pressure part and an anti-rotation part coaxially arranged thereon. The build pressure part and the anti-rotation part are hollow inside to form corresponding build pressure cavities and anti-rotation cavities. The build pressure cavities and the anti-rotation cavities are communicated, and a piston in sliding sealing connection with the build pressure cavities is arranged in the build pressure cavities. The screw assembly comprises a ball screw nut and a screw rod. The ball screw nut and the screw rod are located in the anti-rotation cavities. The ball screw nut is drivingly connected with the piston, and the anti-rotation part cooperates with the ball screw nut to prevent the circumferential motion of the ball screw nut. A part of the screw rod extends out of the anti-rotation cavities and is drivingly connected with the motor.

[0007] Further, a plurality of anti-rotation grooves are uniformly distributed on the ball screw nut, the length direction of the anti-rotation grooves is consistent with the axial direction of the ball screw nut, a plurality of bosses corresponding to the anti-rotation grooves are uniformly distributed on the inner wall of the anti-rotation part, and the bosses are in sliding connection with the anti-rotation grooves.

[0008] Further, the lead screw is provided with a limiting ring at one end away from the anti-rotation part, the limiting ring is coaxially arranged with the lead screw, and the limiting ring is matched with the bearing of the motor.

[0009] Further, the lead screw is provided with a threaded hole coaxially arranged with the lead screw at one end close to the limiting ring, the limiting ring is provided with a screw hole corresponding to the threaded hole, and the limiting ring is fixedly connected with the lead screw through a screw threadedly connected with the threaded hole and the screw hole.

[0010] Further, the motor is provided with a motor plug at one end close to the limiting ring, and the motor plug is detachably connected with the motor.

[0011] Further, the motor plug is provided with a second sealing ring at the connection position of the motor.

[0012] Further, the motor is provided with an angle position sensor, and the angle position sensor is used for detecting the rotating speed of the motor.

[0013] Further, the valve block is provided with a sealing groove at one end close to the motor, and the sealing groove is provided with sealing glue.

[0014] The utility model has the following beneficial effects:

[0015] The utility model integrates the PSU flange and the anti-rotation part to the valve block, does not need to set more connecting parts, the assembly process is relatively simple, the assembly efficiency is relatively high, avoids the product failure caused by the failure of the O-shaped ring, reduces the number of assembly samples, and reduces the cost. DRAWINGS

[0016] Fig. 1 It is the whole schematic view of the build pressure unit of the brake system.

[0017] Fig. 2 It is the valve block schematic view of the build pressure unit of the brake system.

[0018] In the figure, 1 is a valve block, 2 is a motor, 3 is a build pressure part, 4 is an anti-rotation part, 5 is a piston, 6 is a nut, 7 is a lead screw, 8 is a limiting ring, 9 is a motor plug, 10 is a sealing groove, 11 is an angle position sensor, 12 is a bearing, 13 is a screw, and 14 is a boss. DETAILED DESCRIPTION

[0019] In order to achieve the above-mentioned purposes and effects, the utility model adopts the technical means and structure, and the characteristics and functions are described in detail in combination with the preferred embodiments of the utility model.

[0020] As shown in the accompanying drawings, Figs. 1-2The utility model provides a kind of pressure building unit of brake system, including valve block 1, motor 2 and screw assembly;Valve block 1 has coaxial pressure building part 3 and anti-rotation part 4, the inside of pressure building part 3 and anti-rotation part 4 is hollow structure, corresponding pressure building cavity and anti-rotation cavity are formed, pressure building cavity and anti-rotation cavity are interconnected, piston 5 of sliding seal connection with pressure building cavity is provided in pressure building cavity;Anti-rotation cavity is provided with screw assembly, screw assembly includes nut 6 and screw rod 7 that mutually cooperate, nut 6 and screw rod 7 are coaxial with anti-rotation part 4, nut 6 is uniformly distributed with multiple anti-rotation grooves, the length direction of anti-rotation groove is consistent with the movement direction of nut 6 and both ends of anti-rotation groove are communicated with outside, the inner wall of anti-rotation part 4 is provided with boss 14 that is adapted to anti-rotation groove, boss 14 is inserted into anti-rotation groove and is slidably connected with anti-rotation groove, so as to avoid the movement of nut 6 in the circumferential direction by the cooperation of boss 14 and anti-rotation groove without affecting the linear displacement of nut 6 on screw rod 7.Nut 6 is connected with piston 5, so as to drive piston 5 to slide in pressure building cavity by nut 6, and carry out pressure increasing or pressure reducing.

[0021] The rotor of motor 2 is a hollow shaft, the valve block 1 is fixedly connected with the motor 2, one end of the valve block 1 close to the motor 2 is provided with a sealing groove 10, and a sealing glue is arranged in the sealing groove 10 to prevent foreign matters from entering the motor 2. The anti-rotation part 4 of the valve block 1 is inserted into the rotor of the motor 2 and is coaxial with the rotor. The screw rod 7 in the anti-rotation part 4 is drivenly connected with the rotor by extending out of the anti-rotation part 4 at an end away from the anti-rotation part 4.

[0022] In actual use, the motor 2 is powered on, the rotor of the motor 2 rotates in a forward direction and drives the screw rod 7 to rotate. The rotation of the screw rod 7 drives the nut 6 on the screw rod 7 to move towards the pressure building part 3, and the piston 5 connected with the nut 6 moves in the pressure building cavity, so as to carry out pressure increasing. When pressure reducing is needed, the rotor of the motor 2 reverses, the nut 6 drives the piston 5 to move away from the pressure building part 3, so as to realize pressure reducing.

[0023] In another embodiment, a limiting ring 8 coaxial with the screw rod 7 is arranged at an end of the screw rod 7 away from the anti-rotation part 4. The middle part of the limiting ring 8 is fixedly connected with the screw rod 7 by a screw 13. The end of the limiting ring 8 away from the screw rod 7 is matched with a bearing 12 in the motor 2. The bearing 12 is arranged on a bearing seat and is connected with a motor shell through the bearing seat. Thus, the axial and radial movement of the screw rod 7 is avoided without affecting the rotation of the screw rod 7.

[0024] When the end face of the rotor of the motor 2 contacts the end face of the screw rod 7, the end face of the rotor is located between the bearing 12 and the screw rod 7, one end of the rotor is in contact with the screw rod 7, and the other end is in contact with the bearing 12, when the rotor rotates, the friction force of one end of the rotor directly drives the screw rod 7 to rotate, and the other end drives the bearing 12 to rotate first and further drives the limiting ring 8 to rotate, and then the rotating force is transmitted to the screw rod 7 connected with the limiting ring 8. At the same time, the screw rod 7 and the limiting ring 8 are connected through the screw 13, which gives the screw rod 7 a force close to the end face of the rotor, so as to ensure that the screw rod 7 and the bearing 12 are in contact and locked, and the limiting ring 8, the bearing 12, the screw rod 7 and the rotor form an integral whole, so as to ensure the rotation of the screw rod 7 and the reliability of the whole device.

[0025] In another embodiment, the motor 2 is provided with a motor plug cover 9 close to one end of the limiting ring 8, the motor plug cover 9 is detachably connected with the motor 2, and the connection between the motor plug cover 9 and the motor 2 is provided with a second sealing ring. Thus, foreign matter or water vapor is prevented from entering the inside of the motor 2.

[0026] In another embodiment, the motor 2 is provided with an angle position sensor 11, so as to realize the detection of the rotating speed of the motor 2.

[0027] The above only describes the preferred embodiment of the present application, not all embodiments, anyone should know that the structural changes made under the inspiration of the present application, any technical solution with the same or similar to the present application, belongs to the protection scope of the present application.

Claims

1. A pressure building unit of a brake system, characterized by, The application relates to a valve block (1), a motor (2) and a screw rod assembly, wherein the valve block (1) is provided with coaxial pressure building part (3) and anti-rotation part (4), the pressure building part (3) and the anti-rotation part (4) are hollow structures, corresponding pressure building cavities and anti-rotation cavities are formed, the pressure building cavities and the anti-rotation cavities are communicated, a piston (5) is arranged in the pressure building cavities and is in sliding sealing connection with the pressure building cavities, the screw rod assembly comprises a screw nut (6) and a screw rod (7), the screw nut (6) and the screw rod (7) are located in the anti-rotation cavities, the screw nut (6) is in driving connection with the piston (5), the anti-rotation part (4) is matched with the screw nut (6) to prevent the screw nut (6) from moving in the circumferential direction, and a part of the screw rod (7) extends out of the anti-rotation cavities and is in driving connection with the motor (2). A plurality of anti-rotation grooves are uniformly distributed on the screw nut, the length direction of the anti-rotation grooves is consistent with the axial direction of the screw nut (6), a plurality of convex platforms (14) corresponding to the anti-rotation grooves are uniformly distributed on the inner wall of the anti-rotation part (4), and the convex platforms (14) are in sliding connection with the anti-rotation grooves. A limiting ring (8) is arranged at one end of the screw rod (7) away from the anti-rotation part (4), the limiting ring (8) is coaxial with the screw rod (7), and the limiting ring (8) is matched with the bearing (12) of the motor (2).

2. A pressure building unit of a brake system according to claim 1, characterized in that A threaded hole coaxial with the screw rod (7) is arranged at one end of the screw rod (7) close to the limiting ring (8), a screw hole corresponding to the threaded hole is arranged on the limiting ring (8), and the limiting ring (8) is fixedly connected with the screw rod (7) through a screw (13) in threaded connection with the threaded hole and the screw hole.

3. A pressure building unit of a brake system according to claim 2, characterized in that A motor plug cover (9) is arranged at one end of the motor (2) close to the limiting ring (8), and the motor plug cover (9) is detachably connected with the motor (2).

4. A pressure building unit of a brake system according to claim 3, characterized in that A second sealing ring is arranged at the connection between the motor plug cover (9) and the motor (2).

5. A pressure building unit of a brake system according to any one of claims 1 to 4, characterized in that An angle position sensor (11) is arranged in the motor (2), and the angle position sensor (11) is used for detecting the rotating speed of the motor (2).

6. A pressure building unit of a brake system according to claim 5, characterized in that A sealing groove (10) is arranged at one end of the valve block (1) close to the motor (2), and sealing glue is arranged in the sealing groove (10).

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