Electric control braking system transmission mechanism

Abstract

The invention discloses an electric control braking system transmission mechanism which comprises a motor, the motor comprises a rotor, the rotor is connected with a rotor sleeve, a motor base is arranged in the motor, and one end of the rotor sleeve is fixedly connected with the motor base; a ball screw is further arranged in the motor and comprises a screw shaft and a nut, the screw shaft is matched with the nut, and one end of the screw shaft is located in the motor base and makes contact with the motor base; a limiting structure for keeping the ball screw not loose is arranged between the motor base and the lead screw shaft, the nut is connected with a plunger, the plunger extends out of the motor, and by the adoption of the electric control braking system transmission mechanism, the number of parts is small, the limiting effect is reliable, and the application cost is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of brake systems, and in particular, relates to a transmission mechanism of an electric control brake system. Background Art

[0002] In existing electric control braking systems, how to effectively limit the transmission mechanism has always been a design problem to be solved.

[0003] At present, the limiting structure of the transmission mechanism is to install a pressure plate on the screw shaft, and use the pressure plate to compress the double-layer retaining ring to achieve axial limiting of the transmission mechanism. This structure uses a large number of parts, the assembly process is difficult, and the material cost is high; or a baffle with a flange is designed, and the retaining ring is arranged in the flange of the baffle, and the rotor tube presses the double-layer retaining ring to achieve axial limiting of the transmission mechanism. The baffle molding process of this structure is complicated and the development and manufacturing cost is high.

[0004] The invention patent with announcement number CN115257673A disclosed on November 1, 2022, a transmission structure for an electric-controlled booster with a reduction device, in which the gear ring of the reduction device is rotatably connected to the adapter frame through bearing 1, one end of the nut is fixedly connected to the gear ring of the reduction device, and the other end is rotatably connected to the adapter frame through bearing 2, the screw shaft is rotatably connected to the nut through a steel ball, and the front end of the screw shaft is fixedly connected to the limiter. This transmission structure cannot reduce the number of parts, does not have a reliable limit function, and cannot reduce costs. Summary of the invention

[0005] The purpose of the present invention is to provide an electric control brake system transmission mechanism with a small number of parts, reliable limiting effect and low application cost in view of the shortcomings of the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The transmission mechanism of the electric control braking system includes a motor, the motor includes a rotor, the rotor is connected to a rotor sleeve, a motor base is arranged inside the motor, and one end of the rotor sleeve is fixedly connected to the motor base; a ball screw is also arranged inside the motor, the ball screw includes a screw shaft and a nut, the screw shaft cooperates with the nut, one end of the screw shaft is located in the motor base and contacts with the motor base; a limiting structure for keeping the ball screw from loosening is arranged between the motor base and the screw shaft, the nut is connected to a plunger, and the plunger extends from the motor.

[0008] The limiting structure includes a boss, which is arranged on the inner side of one end of the motor base, a baffle is sleeved on the screw shaft, a retaining ring is arranged between the boss and the baffle, and two sides of the retaining ring are respectively in contact with one side of the boss and the end face of the baffle; the end of the rotor sleeve extends into the motor base and contacts the other side of the boss, and the rotor sleeve is fixedly connected to the motor base.

[0009] The screw shaft includes a supporting journal, an inner spline sleeve is provided on the supporting journal, the inner spline sleeve is interference fit with the screw shaft, an outer spline sleeve is provided outside the inner spline sleeve, the outer spline sleeve is located in the motor base, the outer spline sleeve is interference fit with the motor base, and the outer spline sleeve is connected to the inner spline sleeve.

[0010] The inner spline sleeve is provided with a first step, a washer is provided on the first step, a rubber pad is provided between the baffle plate and the washer, a second step is provided on the baffle plate, the rubber pad is sleeved on the second step, and the baffle ring, baffle plate, rubber pad and washer are coaxially arranged in sequence.

[0011] The outer diameter of the retaining ring is greater than the inner diameter of the boss, and the inner diameter of the retaining ring is smaller than the outer diameter of the baffle.

[0012] The nut is located in the rotor sleeve, one end of the nut and the inner side of the end of the plunger are both provided with threads, and the nut is threadedly connected to the plunger.

[0013] The end of the support shaft neck is a spherical structure, an arc groove is provided in the middle of the motor base, and the end of the support shaft neck is in contact with the arc groove.

[0014] The retaining ring is a double-layer retaining ring, and a gap is arranged between the two ends of the retaining ring.

[0015] The motor includes a motor housing, with a first bearing and a second bearing respectively provided at two ends of the motor housing, the outer sides of the first bearing and the second bearing are fixedly connected to the motor housing, the motor base is fixedly connected to the inner side of the first bearing, and the rotor sleeve is fixedly connected to the inner side of the second bearing.

[0016] An assembly tool is arranged outside the motor housing, and the assembly tool comprises a tool base, a tool pressure plate is arranged on one side of the tool base, a mounting block is arranged in the middle of the tool pressure plate, and one end of the mounting block abuts against a retaining ring.

[0017] The technical effects of the present invention are as follows: compared with the prior art, the electric control braking system transmission mechanism of the present invention optimizes the limiting structure of the transmission mechanism shaft system components, simplifies the structure of the baffle, reduces the number of parts and components, reduces material costs, and simplifies the baffle molding process, thereby reducing manufacturing and processing costs; a boss is designed in the motor base to limit the retaining ring between the boss and the baffle, and the retaining ring is reasonably arranged, which can effectively prevent the axial movement of the transmission mechanism and realize reliable axial limiting of the ball screw and related components; the retaining ring structure is reasonably designed, which reduces the difficulty of assembly and improves assembly efficiency; the layout of each component is reasonable, the connection is reliable, the overall structure has reliable transmission, and the operation is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] This specification includes the following drawings, which show the following contents:

[0019] Figure 1 is a cross-sectional schematic diagram of the transmission mechanism of the electric control braking system of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of the internal structure of the motor base;

[0021] Figure 3 It is an exploded schematic diagram of the transmission mechanism of the present invention;

[0022] Figure 4-1 and Figure 4-2 It is a schematic diagram of the installation process of the retaining ring of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a retaining ring used in the present invention.

[0024] The markings in the figure are: 1. Motor; 2. Ball screw; 201. Nut; 202. Screw shaft; 203. Support journal; 3. Motor base; 301. Boss; 302. Arc groove; 5. Rotor; 6. Rotor sleeve; 7. Rubber pad; 8. Baffle; 9. Retaining ring; 10. Washer; 11. Plunger; 12. Inner spline sleeve; 13. Outer spline sleeve; 14. First step; 15. Second step; 16. First bearing; 17. Second bearing; 18. Motor housing; 19. Tool base; 20. Tool pressure plate; 21. Mounting block one; 22. Mounting block two. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0026] like Figures 1 to 5 As shown, the transmission mechanism of the electric control braking system includes a motor 1, the motor 1 includes a rotor 5, the rotor 5 is connected to a rotor sleeve 6, a motor base 3 is provided in the motor 1, and one end of the rotor sleeve 6 is fixedly connected to the motor base 3; a ball screw 2 is also provided in the motor 1, the ball screw 2 includes a screw shaft 202 and a nut 201, the screw shaft 202 cooperates with the nut 201, one end of the screw shaft 202 is located in the motor base 3 and contacts with the motor base 3; a limiting structure for keeping the ball screw from loosening is provided between the motor base 3 and the screw shaft 202, the nut 201 is connected to a plunger 11, and the plunger 11 extends from the motor 1.

[0027] The motor 1 converts the power into the extension and retraction of the plunger 11 through the ball screw 2 transmission pair. The ball screw 2 includes a screw shaft 202, a nut 201 and a steel ball. The screw shaft 202 is rotatably connected to the nut 201 through the steel ball. The ball screw 2 converts the rotation into the linear movement of the nut 201. The forward and reverse rotation of the screw shaft 202 realizes the extension and retraction of the plunger 11, thereby realizing the pressure building and pressure relief process of the plunger 11. The boss 301, the retaining ring 9 and the baffle 8 constitute the limiting structure of the transmission mechanism to ensure stable transmission.

[0028] like Figure 2 As shown, the limiting structure includes a boss 301, which is arranged on the inner side of one end of the motor base 3, a baffle 8 is sleeved on the screw shaft 202, and a retaining ring 9 is provided between the boss 301 and the baffle 8, and the two sides of the retaining ring 9 are respectively in contact with one side of the boss 301 and the end of the baffle 8; the end of the rotor sleeve 6 extends into the motor base 3 and is fixedly connected to the other side of the boss 301. The boss 301 is an annular boss. The boss 301 and the motor base 3 are an integrated structure. The retaining ring 9 is arranged between the boss 301 of the motor base 3 and the baffle 8. In a natural state, the inner ring diameter of the retaining ring 9 is smaller than the outer ring diameter of the baffle 8, and the outer diameter of the retaining ring 9 is larger than the inner diameter of the boss 301. The retaining ring 9 is blocked in both axial directions, which effectively prevents the axial movement of the screw shaft, spline sleeve, buffer assembly or baffle 8, thereby realizing axial limitation of the ball screw 2 and related components, and preventing the transmission mechanism of the electric control brake system from detaching from the inside of the motor 1; the design of the boss 301 not only limits the installation of the retaining ring 9 to ensure the stability of the transmission parts, but also expands the welding area of ​​the rotor sleeve 6 and the motor base 3, thereby improving the stability of the connection between the two.

[0029] like Figure 2 As shown, the screw shaft 202 includes a support journal 203, on which an inner spline sleeve 12 is provided, which is interference fit with the screw shaft 202, and an outer spline sleeve 13 is provided outside the inner spline sleeve 12, which is located inside the motor base 3, and is interference fit with the motor base 3, and the outer spline sleeve 13 is connected to the inner spline sleeve 12. The inner spline sleeve 12 is interference fit on the support journal 203 of the screw shaft 202, and is fixedly connected to the screw shaft 202; the outer spline sleeve 13 is interference fit or interference welded with the motor base 3, and the inner spline sleeve 12 and the outer spline sleeve 13 transmit torque through spline and tooth fit, and then the torque is converted into linear motion of the nut 201 through the ball screw.

[0030] like Figure 3As shown, the inner spline sleeve 12 is provided with a first step 14, a washer 10 is provided on the first step 14, a rubber pad 7 is provided between the baffle 8 and the washer 10, a second step 15 is provided on the baffle 8, the rubber pad 7 is sleeved on the second step 15, and the baffle 9, the baffle 8, the rubber pad 7 and the washer 10 are coaxially arranged in sequence. The first step 14 provides a mounting position for the washer 10, and the second step 15 provides a mounting position for the rubber pad 7; the baffle 8 and the boss 301 form a mounting area for the baffle 9, which can ensure the axial limit of the entire transmission head, and the baffle 8 is coaxially assembled with the screw shaft 202, and the two can move axially relative to each other; the baffle 8 is a stepped structure, and the baffle 8 is a stamping part, and its structural design is simple, and molding is easier, which greatly reduces the development cost of the product. The washer 10 is at the end of the inner spline sleeve 12, and can also be made into an integral structure with the inner spline sleeve 12. The washer 10 can buffer the load change during the transmission process of the ball screw 2, reduce the excessive extrusion force that may be generated during the transmission, and play a role in protecting the inner spline sleeve 12 and the outer spline sleeve 13. The rubber pad 7 is rubber, spring or a combination of rubber and spring. The rubber pad 7 is installed between the baffle 8 and the washer 10 to buffer the transmission mechanism.

[0031] like Figure 2 As shown, the outer diameter of the retaining ring 9 is larger than the inner diameter of the boss 301, and the inner diameter of the retaining ring 9 is smaller than the outer diameter of the baffle 8. With the above structure, the retaining ring 9 can be stably restricted between the boss 301 and the baffle 8 and will not be easily separated, thereby ensuring that its axial limiting function is long-term and reliable. During installation, the radial deformation function of the retaining ring 9 is fully utilized, which greatly facilitates the installation and positioning process of the retaining ring 9 and has broad application prospects in the pressure building module of the hydraulic wire control brake system.

[0032] like Figure 1 As shown, the nut 201 is located in the rotor sleeve 6, and one end of the nut 201 and the inner side of the end of the plunger 11 are both provided with threads, and the nut 201 is threadedly connected to the plunger 11. The end of the plunger 11 abuts against the nut 201 and is also threadedly connected to the nut 201. The connection between the nut 201 and the plunger 11 is stable and reliable, and can be easily disassembled.

[0033] like Figure 2 As shown, the end of the support journal 203 is a spherical structure, and an arc groove 302 is provided in the middle of the motor base 3, and the end of the support journal 203 contacts the arc groove 302. In the above structure, the end of the screw shaft 202 forms a spherical secondary structure with the motor base 3, and the end of the screw shaft 202 is in good stress condition and has strong anti-overturning force ability, which can ensure the automatic centering of the screw shaft 202, thereby ensuring the reliable straightness of the movement of the nut 201 and the plunger 11, and at the same time fully utilizing the space, thereby improving the compactness of the structure.

[0034] like Figure 5As shown, the retaining ring 9 is a double-layer retaining ring 9, and a gap is provided between the two ends of the retaining ring 9. The retaining ring 9 is at least a single-layer annular elastic member, and a common retaining ring 9, a double-layer retaining ring 9, a wave spring and a butterfly spring can be selected. The material of the retaining ring 9 is not limited to stainless steel; due to the setting of the gap, the retaining ring 9 can be compressed and radially reduced during installation so as to extend from the rotor sleeve 6 to the installation position.

[0035] like Figure 1 As shown, the motor 1 includes a motor housing 18, and a first bearing 16 and a second bearing 17 are respectively provided at both ends of the motor housing 18. The outer sides of the first bearing 16 and the second bearing 17 are fixedly connected to the motor housing 18, the motor base 3 is fixedly connected to the inner side of the first bearing 16, and the rotor sleeve 6 is fixedly connected to the inner side of the second bearing 17. The arrangement of the bearings in the above structure ensures that the motor housing 18 will not be driven while the rotor sleeve 6 and the motor base 3 are rotated, and also provides support for the rotor sleeve 6 and the motor base 3.

[0036] like Figure 4-1 and Figure 4-2 As shown, an assembly tool is provided on the outside of the motor housing 18, and the assembly tool includes a tool base 19, a tool pressure plate 20 is provided on one side of the tool base 19, and a mounting block is provided in the middle of the tool pressure plate 20, and one end of the mounting block abuts against the retaining ring 9. The assembly tool is suitable for the installation of double-layer retaining rings, and the mounting blocks are divided into mounting block 1 21 and mounting block 2 22. The tool base 19 and the tool pressure plate 20 fix the motor 1 as a whole, and the retaining ring 9 extends from the middle of the tool pressure plate 20, and is radially deformed by the extrusion of the mounting block and enters the rotor sleeve 6. Since the inner diameter of the retaining ring 9 is smaller than the outer diameter of the baffle 8, the retaining ring 9 is blocked by the baffle 8 and restored to be located between the baffle 8 and the boss 301, and the retaining ring 9 reaches the installation position, and the operation method is simple and fast, and the assembly difficulty is low.

[0037] The working principle of the transmission mechanism of the electric control braking system is as follows: the ball screw 2 is coaxially arranged with the rotor 5, the rotor sleeve 6 is welded to the motor base 3, and the motor base 3 is provided with a boss 301 supported by the rotor sleeve 6. After power is turned on, the rotor 5 of the motor 1 rotates, driving the motor base 3 to rotate together, the motor base 3 is fixedly connected with the outer spline sleeve 13, the inner spline sleeve 12 and the outer spline sleeve 13 transmit torque through the splines, the inner spline sleeve 12 and the screw shaft 202 are interference fit, and the rotor 5 transfers the torque to the screw shaft 202 through the motor base 3, the inner spline sleeve 12 and the outer spline sleeve 13. The screw shaft 202 rotates to drive the screw shaft 202 nut 201 forward / backward to achieve pressure buildup / pressure relief on the plunger 11. In the above process, the retaining ring 9 is arranged between the boss 301 and the baffle 8, the inner ring diameter of the retaining ring 9 is larger than the outer ring diameter of the baffle 8, and the outer diameter of the retaining ring 9 is larger than the inner diameter of the boss 301 of the motor base 3. The position of the retaining ring 9 is stable, which prevents the axial movement of the screw shaft and realizes axial limitation of the ball screw 2 and related components; at the same time, the rubber pad 7 is arranged between the washer 10 and the baffle 8 to buffer the transmission mechanism.

[0038] Embodiment: The motor 1 adopts a brushless motor 1, which provides input torque to realize the rotation of the rotor 5, the rotor sleeve 6 and the motor base 3 after being energized. The motor base 3 transmits the torque to the screw shaft 202 through a spline transmission. The torque transmission drives the ball screw 2 to move linearly. The nut 201 is fixedly connected to the plunger 11. Under the drive of the nut 201, the plunger 11 moves linearly to complete pressure buildup / pressure relief, thereby realizing control of the hydraulic brake system.

[0039] The assembly process of the retaining ring 9 through the tooling is as follows: Figure 4-1 This is the first stage of the assembly process of the retaining ring 9. The motor 1 is installed into the tooling base 19, and the tooling pressure plate 20 is pressed onto the tooling base 19. The tooling pressure plate 20 is designed with a tapered structure, and the opening is larger than the size of the straight section. The retaining ring 9 is naturally installed into the mouth of the tooling pressure plate 20, and the installation block 21 presses the retaining ring 9 toward the straight section. After the installation block 21 completes the effective stroke of pressing, it enters Figure 4-2 The second stage of the assembly process of the middle retaining ring 9, at this time, the mounting block 22 continues to press the retaining ring 9 until the retaining ring 9 contacts the baffle 8, and the retaining ring 9 continues to be pressed in, and the rubber pad 7 enters a compressed state until the other side of the retaining ring 9 is completely separated from the boss 301 of the motor base 3, and the retaining ring 9 recovers from the compressed state to the natural state in the radial direction, and is still in a compressed state in the axial direction. One side of the retaining ring 9 contacts the motor base 3, and the other side contacts the baffle 8. The entire system is in a stable state, and the ball screw 2 and its associated components are axially limited to ensure that the ball screw 2 and its associated components do not fall out of the motor 1.

[0040] Compared with the prior art, the transmission mechanism of the electric control braking system optimizes the limiting structure of the transmission mechanism shaft system components, simplifies the structure of the baffle 8, reduces the number of parts and components, reduces the material cost, and has a simple molding process for the baffle 8, which reduces the manufacturing and processing cost; a boss 301 is designed in the motor base 3, and the retaining ring 9 is limited between the boss 301 and the baffle 8. The retaining ring 9 is reasonably arranged, which can effectively prevent the axial movement of the transmission mechanism and realize reliable axial limiting of the ball screw 2 and related components; the retaining ring 9 has a reasonable structural design, which reduces the difficulty of assembly and improves the assembly efficiency; the layout of each component is reasonable, the connection is reliable, the overall structure has reliable transmission, and the operation is stable.

[0041] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An electric control brake system transmission mechanism, characterized in that: The motor (1) comprises a motor (1), wherein the motor (1) comprises a rotor (5), wherein the rotor (5) is connected to a rotor sleeve (6), wherein a motor base (3) is provided in the motor (1), and one end of the rotor sleeve (6) is fixedly connected to the motor base (3); wherein a ball screw (2) is also provided in the motor (1), wherein the ball screw (2) comprises a screw shaft (202) and a nut (201), wherein the screw shaft (202) cooperates with the nut (201), and one end of the screw shaft (202) is located in the motor base (3) and in contact with the motor base (3); wherein a limiting structure for keeping the ball screw from loosening is provided between the motor base (3) and the screw shaft (202), wherein the nut (201) is connected to a plunger (11), and wherein the plunger (11) extends out of the motor (1).

2. The electric control brake system transmission mechanism according to claim 1, characterized in that: The limiting structure comprises a boss (301), the boss (301) is arranged on the inner side of one end of the motor base (3), a baffle (8) is sleeved on the lead screw shaft (202), a retaining ring (9) is arranged between the boss (301) and the baffle (8), and two sides of the retaining ring (9) are respectively in contact with one side of the boss (301) and the end surface of the baffle (8); the end of the rotor sleeve (6) extends into the motor base (3) and contacts with the other side of the boss (301), and the rotor sleeve (6) is fixedly connected to the motor base (3).

3. The electric control brake system transmission mechanism according to claim 2, characterized in that: The screw shaft (202) comprises a supporting journal (203), an inner spline sleeve (12) is provided on the supporting journal (203), the inner spline sleeve (12) and the screw shaft (202) are interference fit, an outer spline sleeve (13) is provided outside the inner spline sleeve (12), the outer spline sleeve (13) is located inside the motor base (3), the outer spline sleeve (13) and the motor base (3) are interference fit, and the outer spline sleeve (13) is connected to the inner spline sleeve (12).

4. The electric control brake system transmission mechanism according to claim 3, characterized in that: The inner spline sleeve (12) is provided with a first step (14), the first step (14) is provided with a washer (10), a rubber pad (7) is provided between the baffle plate (8) and the washer (10), the baffle plate (8) is provided with a second step (15), the rubber pad (7) is sleeved on the second step (15), and the baffle plate (9), the baffle plate (8), the rubber pad (7) and the washer (10) are coaxially arranged in sequence.

5. The electric control brake system transmission mechanism according to any one of claims 2 to 4, characterized in that: The outer diameter of the retaining ring (9) is greater than the inner diameter of the boss (301), and the inner diameter of the retaining ring (9) is smaller than the outer diameter of the baffle (8).

6. The electric control brake system transmission mechanism according to claim 5, characterized in that: The nut (201) is located inside the rotor sleeve (6), one end of the nut (201) and the inner side of the end of the plunger (11) are both provided with threads, and the nut (201) is threadedly connected to the plunger (11).

7. The electric control brake system transmission mechanism according to claim 3, characterized in that: The end of the support shaft journal (203) is a spherical structure, an arc-shaped groove (302) is provided in the middle of the motor base (3), and the end of the support shaft journal (203) is in contact with the arc-shaped groove (302).

8. The electric control brake system transmission mechanism according to claim 5, characterized in that: The retaining ring (9) is a double-layer retaining ring, and a gap is provided between the two ends of the retaining ring (9).

9. The electric control brake system transmission mechanism according to claim 7, characterized in that: The motor (1) comprises a motor housing (18), wherein a first bearing (16) and a second bearing (17) are respectively provided at two ends of the motor housing (18), the outer sides of the first bearing (16) and the second bearing (17) are both fixedly connected to the motor housing (18), the motor base (3) is fixedly connected to the inner side of the first bearing (16), and the rotor sleeve (6) is fixedly connected to the inner side of the second bearing (17).

10. The electric control brake system transmission mechanism according to claim 8, characterized in that: An assembly tool is provided outside the motor housing (18), and the assembly tool comprises a tool base (19). A tool pressure plate (20) is provided on one side of the tool base (19), and a mounting block is provided in the middle of the tool pressure plate (20), and one end of the mounting block is in contact with a retaining ring (9).

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