Motor for automobile brake system

Abstract

The present invention discloses a motor for automobile brake system, including a motor assembly and a hydraulic integrated block, wherein the motor assembly is installed on one side of the hydraulic integrated block, the motor assembly includes a motor housing and a stator arranged in the center of the motor housing, an outer rotor is arranged on the outer side of the stator, a ball screw pair is arranged in the center of the stator, one end of the stator is connected to a servo cylinder piston, the servo cylinder piston is inserted into the servo cylinder assembly installed on one side of the hydraulic integrated block, the outer rotor drives the screw of the ball screw pair to rotate together, and the linear motion of the nut sleeved on the screw drives the stator and the servo cylinder piston to perform linear motion. The present invention arranges the servo cylinder assembly inside the motor, with high integration and small volume.

Description

Technical Field

[0001] The present invention relates to the field of automobile motors, and in particular to a motor for automobile brake systems. Background Art

[0002] The motor is the power source of automotive linear brake products. Its main function is to convert the rotational motion of the rotor into the linear motion of the internal kinematic pair through the motor and the internal kinematic pair, thereby realizing the pressure output of the hydraulic unit. The common structure of the motor is that the rotor is located inside the stator. This type of structure usually cannot efficiently utilize the internal cavity space of the motor, resulting in the overall structure of the linear product being complex, large in size, heavy in weight, and difficult to arrange the hydraulic manifold pipeline. Summary of the invention

[0003] The invention provides a motor for an automobile brake system, in which a servo cylinder assembly is arranged inside the motor, and the motor has high integration and small volume.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a motor for an automobile brake system, comprising a motor assembly and a hydraulic integrated block, wherein the motor assembly is installed on one side of the hydraulic integrated block, the motor assembly comprises a motor housing and a stator arranged at the center of the motor housing, an outer rotor is arranged on the outer side of the stator, a ball screw pair is arranged in the center of the stator, one end of the stator is connected to a servo cylinder piston, the servo cylinder piston is inserted into the servo cylinder assembly installed on one side of the hydraulic integrated block, the outer rotor drives the screw of the ball screw pair to rotate together, and the linear motion of the nut sleeved on the screw drives the stator and the servo cylinder piston to perform linear motion.

[0005] From the outside, the entire device only includes a motor assembly and a hydraulic integrated block. The servo cylinder assembly is also arranged inside the motor assembly. The overall volume is relatively small and the integration is relatively high.

[0006] Preferably, an electronic control unit is installed on the other side of the hydraulic integrated block, and the electronic control unit is connected to the stator through a motor power line. A circuit board is provided in the electronic control unit for controlling the rotation of the motor. The connection between the motor power line and the circuit board is a hard-wired connection, but the stator winding and the motor three-phase power line need to be realized with a soft wire, so as to ensure a reliable connection of the stator during the entire stroke.

[0007] Preferably, a motor angle sensor is installed on the hydraulic integrated block, and a magnetic ring is installed on one end of the outer rotor close to the hydraulic integrated block. One end of the motor angle sensor senses the magnetic signal output by the magnetic ring, and the other end is connected to the electronic control unit. When the outer rotor drives the magnetic ring to rotate, it outputs a magnetic signal to the motor angle sensor located on the hydraulic integrated block, and finally transmits the signal received by the motor angle sensor to the inside of the circuit board for processing.

[0008] Preferably, a connecting plate is installed at one end of the outer rotor away from the hydraulic integrated block, the center position of the connecting plate is connected to the screw rod, the outer rotor and the connecting plate are connected by a plurality of connecting bolts around the circumference, the outer rotor and the screw rod can be firmly connected, and the screw rod and the connecting plate are generally connected by a spline.

[0009] Preferably, the outer middle part of the connecting plate and the outer side of the outer rotor are connected to the motor housing through the tail end bearing and the front end bearing respectively. The tail end bearing and the front end bearing work together to prevent the outer rotor from shaking during rotation, making the rotational motion more reliable.

[0010] In addition, a connecting plate limit block is installed on one side of the center hole of the connecting plate, and a nut limit block is arranged on one end of the nut on the same circumference as the connecting plate limit block. When the servo cylinder needs to relieve pressure, the nut drives the stator and the servo cylinder piston to move toward the side close to the tail end bearing, and limits the maximum retraction displacement of the nut by the connecting plate limit block and the nut limit block.

[0011] As a supplement, the servo cylinder assembly is provided with a plurality of stator guide posts axially inserted into the stator, and the linear motion of the stator, servo cylinder piston and nut is guided through the stator guide posts.

[0012] Preferably, the servo cylinder assembly comprises a servo cylinder connected to the hydraulic integrated block and a stator positioning ring installed on the outside of one end of the servo cylinder, the stator guide column is inserted into the stator positioning ring, and the stator positioning ring facilitates the installation of the stator guide column.

[0013] Preferably, one end of the servo cylinder connected to the hydraulic integrated block is a servo cylinder mounting plane, and a protruding surface is provided in the middle of the servo cylinder mounting plane. The protruding surface is beneficial to avoiding the disadvantage that the hydraulic integrated block occupies the hydraulic integrated block pipeline design due to the large hole, and a gasket is provided between the protruding surface and the hydraulic integrated block.

[0014] Preferably, a servo cylinder leather cup in contact with the inner wall of the servo cylinder is installed on the outer side of the servo cylinder piston to prevent leakage of hydraulic oil.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] By arranging the motor rotor at the edge of the motor housing and the motor stator near the center of the motor, that is, the stator is located inside the rotor, the nut in the ball screw pair built into the motor is fixed to the stator, and the rotor is fixed to the screw in the ball screw pair, so that the rotational motion of the rotor is converted into the linear motion of the nut and the stator, so that the piston connected to the stator pushes the oil in the servo cylinder to generate oil pressure, which is output to the automobile brake caliper to generate braking force. This structure is conducive to arranging the servo cylinder assembly inside the motor, thereby avoiding the shortcomings of large product assembly volume and the need to perforate the electronic control unit circuit board caused by the symmetrical arrangement of the servo cylinder and the motor. In addition, thanks to the use of part of the space of the motor rotor, the servo cylinder occupies less space in the hydraulic integrated block, which is convenient for the later hydraulic integrated block pipeline layout, and has the characteristics of high integration and small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the front view half-section structure of the present invention;

[0018] Figure 2 is a cross-sectional view of the internal structure of the motor assembly of the present invention;

[0019] Figure 3 It is a schematic diagram of the installation of the hydraulic integrated block and the servo cylinder of the present invention;

[0020] Figure 4 is a structural diagram of the servo cylinder assembly of the present invention;

[0021] Figure 5 is a structural diagram of a connecting plate of the present invention;

[0022] Figure 6 It is a structural diagram of the ball screw pair of the present invention;

[0023] Figure 7 It is a structural schematic diagram of the servo cylinder of the present invention;

[0024] Figure 8 It is a structural schematic diagram of the electronic control unit of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1-8The present invention provides a motor for an automobile brake system, comprising a motor assembly 2 and a hydraulic integrated block 1, wherein the motor assembly 2 is mounted on one side of the hydraulic integrated block 1, the motor assembly 2 comprises a motor housing 201 and a stator 207 arranged at the center of the motor housing 201, an outer rotor 203 is arranged on the outer side of the stator 207, a ball screw pair 3 is arranged in the center of the stator 207, one end of the stator 207 is connected to a servo cylinder piston 208, the servo cylinder piston 208 is inserted into a servo cylinder assembly 4 mounted on one side of the hydraulic integrated block 1, the outer rotor 203 drives the screw 301 of the ball screw pair 3 to rotate together, and the linear motion of the nut 302 sleeved on the screw 301 drives the stator 207 and the servo cylinder piston 208 to perform linear motion.

[0027] From the outside, the entire device only includes a motor assembly 2 and a hydraulic integrated block 1, and the servo cylinder assembly 4 is also arranged inside the motor assembly 2. The overall volume is relatively small and the integration is relatively high.

[0028] An electronic control unit 5 is installed on the other side of the hydraulic integrated block 1. The electronic control unit 5 is connected to the stator 207 through the motor power line 210. A circuit board 501 is provided in the electronic control unit 5 for controlling the rotation of the motor. The connection between the motor power line 210 and the circuit board 501 is a hard-wire connection, but the stator winding and the motor three-phase power line need to be realized in a soft-wire manner, so as to ensure reliable connection of the stator during the entire stroke.

[0029] In addition, a motor angle sensor 6 is installed on the hydraulic integrated block 1, and a magnetic ring 211 is installed on one end of the outer rotor 203 close to the hydraulic integrated block 1. One end of the motor angle sensor 6 senses the magnetic signal output by the magnetic ring 211, and the other end is connected to the electronic control unit 5. When the outer rotor 203 drives the magnetic ring 211 to rotate, it outputs a magnetic signal to the motor angle sensor 6 located on the hydraulic integrated block 1, and finally transmits the signal received by the motor angle sensor 6 to the inside of the circuit board 501 for processing.

[0030] As an embodiment of the connection between the outer rotor 203 and the screw rod 301, a connecting plate 206 is installed at the end of the outer rotor 203 away from the hydraulic integrated block 1, and the center position of the connecting plate 206 is connected to the screw rod 301. The outer rotor 203 and the connecting plate 206 are connected by a plurality of connecting bolts 204 around the circumference, which can firmly connect the outer rotor 203 and the screw rod 301. The screw rod 301 and the connecting plate 206 are generally connected by a flat key.

[0031] In order to ensure the reliable operation of the outer rotor 203, the outer middle part of the connecting plate 206 and the outer side of the outer rotor 203 are respectively connected to the motor housing 201 through the tail end bearing 205 and the front end bearing 202. The tail end bearing 205 and the front end bearing 202 work together to prevent the outer rotor 203 from shaking during rotation, and the rotational motion is more reliable.

[0032] Among them, a connecting plate limit block 206-1 is installed on one side of the center hole of the connecting plate 206, and a nut limit block 302-1 is arranged on the same circumference as the connecting plate limit block 206-1 at one end of the nut 302. When the servo cylinder 401 needs to release pressure, the nut 302 drives the stator 207 and the servo cylinder piston 208 to move toward the side close to the tail end bearing 205, and limits the maximum retraction displacement of the nut through the connecting plate limit block 206-1 and the nut limit block 302-1.

[0033] In order to make the movement of the servo cylinder piston 208 more stable and smooth, the servo cylinder assembly 4 is provided with a plurality of stator guide columns 402 axially inserted into the stator 207. The linear motion of the stator 207, the servo cylinder piston 208 and the nut 302 is guided by the stator guide columns 402. The number of the guide columns 402 is generally not less than three and is arranged around the circumference.

[0034] Among them, the servo cylinder assembly 4 includes a servo cylinder 401 connected to the hydraulic integrated block 1 and a stator positioning ring 403 installed on the outside of one end of the servo cylinder 401, and the stator guide column 402 is inserted on the stator positioning ring 403, and the stator positioning ring 403 facilitates the installation of the stator guide column 402.

[0035] One end of the servo cylinder 401 connected to the hydraulic integrated block 1 is a servo cylinder mounting plane 401-1, and a protruding surface 401-2 is provided in the middle of the servo cylinder mounting plane 401-1. The protruding surface 401-2 is beneficial to avoid the disadvantage that the hydraulic integrated block 1 occupies the pipeline design of the hydraulic integrated block 1 due to the large hole, and a gasket 404 is provided between the protruding surface 401-2 and the hydraulic integrated block 1.

[0036] The outer side of the servo cylinder piston 208 is provided with a servo cylinder leather cup 209 which contacts the inner side wall of the servo cylinder 401 and can prevent leakage of hydraulic oil.

[0037] As an embodiment of the present invention, the assembly relationship of the motor assembly 1 is as follows: the tail end bearing 205, the front end bearing 202 and the motor housing 201 are connected by interference fit;

[0038] After the outer rotor 203 and the magnetic ring 211 are assembled as a whole, they are connected to the connecting plate 206 through the connecting bolts 204, and the outer rotor 203, the connecting bolts 204, the connecting plate 206 and the magnetic ring 211 are pressed into the previously assembled tail end bearing 205 hole;

[0039] The stator 207, the motor power cord 210 and the nut 302 in the ball screw pair 3 are made into a whole through injection molding or other methods, and the stator 207, the motor power cord 210, the ball screw pair 3 and the inner hole of the connecting plate 206 are connected as a whole. The connection method can be achieved by a flat key or the like, and then the servo cylinder piston 208 equipped with the servo cylinder leather cup 209 is connected to the stator 207 as a whole.

[0040] The assembly relationship of the servo cylinder assembly 4 is as follows: the stator guide column 402 is press-fitted through the guide fixture and connected to the hole of the stator positioning ring 403. Simultaneously, the servo cylinder sealing ring 405, the servo cylinder 401, and the hydraulic integrated block 1 are fixed as a whole through riveting or the like. Finally, the components 402 and 403 are assembled with the mating shaft of the servo cylinder 401 which has been riveted through the inner hole of the stator positioning ring 404 through interference connection.

[0041] The assembly relationship between the motor assembly 2 and the servo cylinder assembly 4 is as follows: the stator guide column 402 passes through the holes of the stator 207 and the servo cylinder piston 208 to complete the overall assembly.

[0042] Assembly relationship between the motor angle sensor 6 and the hydraulic integrated block 1: the motor angle sensor 6 is securely fixed to the valve body by means of interference fit, riveting, etc.

[0043] Assembly relationship between the motor power line 210 and the circuit board 501: The motor power line 210 and the circuit board 501 are securely connected to the corresponding interface of the circuit board by means of pin insertion, welding, etc.

[0044] The assembly relationship between the motor angle sensor 6 and the circuit board 501 is as follows: the motor angle sensor 6 is reliably in contact with the corresponding features of the PCB through the pins, spring contacts, etc. on the motor angle sensor 6.

[0045] Its working principle: the outer rotor 203 drives the screw 301 to rotate, and the screw 301 converts the rotational motion into the linear motion of the nut 302, the stator 207, and the servo cylinder piston 208, so that the oil in the servo cylinder 401 cylinder body generates pressure and outputs it to the corresponding pipeline of the hydraulic integrated block 1. When the servo cylinder 401 needs to release pressure, the nut 302 drives the stator 207 and the servo cylinder piston 208 to move to the side close to the tail end bearing 205, and limits the maximum retraction displacement of the nut through the connecting plate limit block 206-1 and the nut limit block 302-1.

[0046] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed by the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A motor for an automobile brake system, comprising a motor assembly (2) and a hydraulic integrated block (1), characterized in that: The motor assembly (2) is mounted on one side of the hydraulic integrated block (1), the motor assembly (2) comprising a motor housing (201) and a stator (207) arranged at the center of the motor housing (201), an outer rotor (203) being arranged on the outside of the stator (207), a ball screw pair (3) being arranged at the center of the stator (207), one end of the stator (207) being connected to a servo cylinder piston (208), the servo cylinder piston (208) being inserted into a servo cylinder assembly (4) mounted on one side of the hydraulic integrated block (1), the outer rotor (203) driving the screw rod (301) of the ball screw pair (3) to rotate together, the nut (302) sleeved on the screw rod (301) moving linearly drives the stator (207) and the servo cylinder piston (208) to move linearly; A connecting plate (206) is installed at one end of the outer rotor (203) away from the hydraulic integrated block (1), and the center position of the connecting plate (206) is connected to the screw rod (301); The outer middle portion of the connecting plate (206) and the outer side of the outer rotor (203) are connected to the motor housing (201) via a tail end bearing (205) and a front end bearing (202), respectively; A connecting plate limiting block (206-1) is installed on one side of the central hole of the connecting plate (206), and a nut limiting block (302-1) is arranged on one end of the nut (302) on the same circumference as the connecting plate limiting block (206-1); The servo cylinder assembly (4) is provided with a plurality of stator guide posts (402) which are axially inserted into the stator (207); The servo cylinder assembly (4) comprises a servo cylinder (401) connected to the hydraulic integrated block (1) and a stator positioning ring (403) installed on the outside of one end of the servo cylinder (401), and the stator guide column (402) is inserted into the stator positioning ring (403); One end of the servo cylinder (401) connected to the hydraulic integrated block (1) is a servo cylinder mounting plane (401-1), and a protruding table surface (401-2) is provided in the middle of the servo cylinder mounting plane (401-1).

2. The motor for automobile brake system according to claim 1, characterized in that: An electronic control unit (5) is installed on the other side of the hydraulic integrated block (1), and the electronic control unit (5) is connected to the stator (207) via a motor power line (210).

3. The motor for automobile brake system according to claim 2, characterized in that: A motor angle sensor (6) is installed on the hydraulic integrated block (1); a magnetic ring (211) is installed on one end of the outer rotor (203) close to the hydraulic integrated block (1); one end of the motor angle sensor (6) senses a magnetic signal output by the magnetic ring (211), and the other end is connected to the electronic control unit (5).

4. The motor for automobile brake system according to claim 1, characterized in that: A servo cylinder leather cup (209) in contact with the inner wall of the servo cylinder (401) is installed on the outer side of the servo cylinder piston (208).

Images