Electric control braking system transmission mechanism

Abstract

The utility model 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 the electric control braking system transmission mechanism is small in part number, reliable in limiting effect and low in application cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of braking system, specifically, the utility model relates to electric control brake system transmission mechanism. BACKGROUND

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

[0003] The current limiting structure of the transmission mechanism is to assemble a pressing plate on the lead screw shaft, and to realize the axial limiting of the transmission mechanism by compressing the double-layer check ring with the pressing plate. This structure has many parts, and the assembly process is difficult and the material cost is high. Or a check plate with a flange is designed, and the check ring is arranged in the flange of the check plate, and the rotor tube presses the double-layer check ring to realize the axial limiting of the transmission mechanism. The check plate of this structure has a complex forming process and high development and manufacturing cost.

[0004] The invention patent with publication number CN115257673A discloses a transmission structure for electric control booster with speed reducer on November 1, 2022. The gear ring of the speed reducer is rotatably connected with the adapter frame through bearing one, one end of the nut is fixedly connected with the gear ring of the speed reducer, the other end is rotatably connected with the adapter frame through bearing two, the lead screw shaft is rotatably connected with the nut through the steel ball, and the front end of the lead screw shaft is fixedly connected with the limiting piece. The transmission structure cannot reduce the number of parts, has no reliable limiting function, and cannot reduce the cost. UTILITY MODEL CONTENTS

[0005] The utility model aims at the deficiencies of the prior art, and provides an electric control brake system transmission mechanism with fewer parts, reliable limiting effect and low application cost.

[0006] In order to achieve the above purpose, the utility model adopts the technical scheme that:

[0007] The electric control brake system transmission mechanism 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, the ball screw comprises a lead screw shaft and a nut, the lead screw shaft is matched with the nut, one end of the lead screw shaft is located in the motor base and in contact with the motor base; a limiting structure for keeping the ball screw from loosening is arranged between the motor base and the lead screw shaft, the nut is connected with a plunger, and the plunger extends out of the motor.

[0008] The limiting structure comprises a boss arranged on the inner side of one end of the motor base, a baffle arranged on the lead screw shaft, a check ring arranged between the boss and the baffle, and the check ring is in contact with the side of the boss and the end face of the baffle respectively; the end of the rotor sleeve extends into the motor base and is in contact with the other side of the boss, and the rotor sleeve is fixedly connected with the motor base.

[0009] The lead screw shaft comprises a support journal, an inner spline sleeve arranged on the support journal, the inner spline sleeve is in interference fit with the lead screw shaft, an outer spline sleeve arranged on the outer side of the inner spline sleeve, the outer spline sleeve is located in the motor base, the outer spline sleeve is in interference fit with the motor base, and the outer spline sleeve is connected with the inner spline sleeve.

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

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

[0012] The lead screw is located in the rotor sleeve, the lead screw is provided with threads on one end and the inner side of the end of the plunger, and the lead screw is threadedly connected with the plunger.

[0013] The end of the support journal is a spherical surface structure, the middle part of the motor base is provided with an arc-shaped groove, and the end of the support journal is in contact with the arc-shaped groove.

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

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

[0016] The motor housing is provided with an assembly tool outside, the assembly tool comprises a tool base, the tool base is provided with a tool pressing plate on one side, the tool pressing plate is provided with a mounting block in the middle part, and one end of the mounting block is in abutment with the check ring.

[0017] The technical effect of the utility model discloses: the electric brake system transmission mechanism of the utility model, compared with prior art, the limiting structure of transmission mechanism shafting part is optimized, the structure of baffle is simplified, the number of parts is reduced, the cost of material is reduced, the baffle forming process is simple, and the manufacturing and processing cost is reduced;Design the boss in the motor base, limit the retaining ring between the boss and the baffle, the retaining ring is arranged reasonably, can effectively prevent the axial movement of transmission mechanism, realize the axial reliable limiting of ball screw and associated components;The retaining ring structure is designed reasonably, reduces the assembly difficulty, improves the assembly efficiency;The layout of each component is reasonable, reliable, the overall structure transmission is reliable, and the operation is stable. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present specification includes the following drawings, and the shown contents are respectively:

[0019] Figure 1 It is the cross section schematic view of the electric brake system transmission mechanism of the utility model;

[0020] Figure 2 It is Figure 1 the internal structure of the motor base;

[0021] Figure 3 It is the explosion decomposition schematic view of the transmission mechanism of the utility model;

[0022] Figure 4-1 And Figure 4-2 It is the installation process schematic view of the retaining ring of the utility model;

[0023] Figure 5 It is the structure schematic view of a retaining ring used in the utility model.

[0024] Marked as in the drawing: 1, motor;2, ball screw;201, nut;202, screw shaft;203, support journal;3, motor base;301, boss;302, arc slot;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 pressing plate;21, mounting block one;22, mounting block two. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model are further explained in detail by the description of the embodiments by comparing with the drawings, the purpose is to help the technical personnel in the field to have more complete, accurate and thorough understanding to the inventive concept and technical scheme of the utility model, and help its implementation.

[0026] As Figures 1 to 5As shown, the electric control brake system transmission mechanism includes a motor 1, the motor 1 includes a rotor 5, the rotor 5 is connected with a rotor sleeve 6, the motor 1 is provided with a motor base 3, one end of the rotor sleeve 6 is fixedly connected with the motor base 3; the motor 1 is further provided with a ball screw 2, 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; the motor base 3 and the screw shaft 202 are provided with a limiting structure for preventing the ball screw from loosening, the nut 201 is connected with a plunger 11, the plunger 11 extends out of the motor 1.

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

[0028] As shown in Figure 2 The limiting structure includes a boss 301, the boss 301 is arranged on the inner side of one end of the motor base 3, the baffle 8 is arranged on the screw shaft 202, the check ring 9 is arranged between the boss 301 and the baffle 8, the check ring 9 contacts with one side of the boss 301 and the end of the baffle 8 respectively; the end of the rotor sleeve 6 extends into the motor base 3 and is fixedly connected with the other side of the boss 301. The boss 301 is an annular boss, the boss 301 and the motor base 3 are an integral structure, the check ring 9 is arranged between the boss 301 and the baffle 8 of the motor base 3, in a natural state, the inner diameter of the check ring 9 is smaller than the outer diameter of the baffle 8, the outer diameter of the check ring 9 is larger than the inner diameter of the boss 301, the check ring 9 is blocked in two axial directions, effectively preventing the axial movement of the screw shaft, the spline sleeve, the buffer assembly or the baffle 8, thereby realizing the axial limiting of the ball screw 2 and the associated components, preventing the electric control brake system transmission mechanism from being separated from the inside of the motor 1; the design of the boss 301 not only limits the installation of the check ring 9 to ensure the stability of the transmission part, but also enlarges the welding area of the connection between the rotor sleeve 6 and the motor base 3, improving the stability of the connection between the two.

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

[0030] As shown in Figure 3 The inner spline sleeve 12 is provided with a first step 14, and the first step 14 is provided with a gasket 10. The baffle plate 8 and the gasket 10 are provided with a rubber pad 7. The baffle plate 8 is provided with a second step 15, and the rubber pad 7 is sleeved on the second step 15. The check ring 9, the baffle plate 8, the rubber pad 7 and the gasket 10 are coaxially arranged in sequence. The first step 14 provides a mounting position for the gasket 10, and the second step 15 provides a mounting position for the rubber pad 7. The baffle plate 8 and the boss 301 form the mounting area of the check ring 9, which can ensure the axial limiting of the entire transmission head. The baffle plate 8 is coaxially assembled with the screw shaft 202, and the two can move axially relative to each other. The baffle plate 8 is in a stepped structure, and it is a stamping part, which is simple in structure design and easy to form, greatly reducing the development cost of the product. The gasket 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 gasket 10 can buffer the change of load in the transmission process of the ball screw 2, reduce the excessive extrusion force that may be generated during transmission, and protect the inner spline sleeve 12 and the outer spline sleeve 13. The rubber pad 7 is rubber, spring or combination of rubber and spring, which is installed between the baffle plate 8 and the gasket 10 and plays a buffering role for the transmission mechanism.

[0031] As shown in Figure 2 The outer diameter of the check ring 9 is greater than the inner diameter of the boss 301, and the inner diameter of the check ring 9 is smaller than the outer diameter of the baffle plate 8. The above structure can stably limit the check ring 9 between the boss 301 and the baffle plate 8, and it will not easily come off, ensuring the long-term reliability of its axial limiting function. When installing, the radial deformation function of the check ring 9 is fully utilized, greatly facilitating the installation and positioning process of the check ring 9, and it has a wide application prospect in the hydraulic line control brake system pressure building module.

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

[0033] As shown in Figure 2 The end of the support journal 203 is a spherical structure, and the middle of the motor base 3 is provided with an arc-shaped groove 302, and the end of the support journal 203 is in contact with the arc-shaped groove 302. The above structure, the end of the screw shaft 202 and the motor base 3 form a spherical pair structure, the end of the screw shaft 202 is in good stress condition and has strong anti-overturning ability, which can ensure the automatic centering of the screw shaft 202, and further ensure the straightness of the movement of the nut 201 and the plunger 11. At the same time, the space is fully utilized, and the compactness of the structure is improved.

[0034] As shown in Figure 5 The stop ring 9 is a double-layer stop ring 9, and a gap is provided between the two ends of the stop ring 9. The stop ring 9 is at least a single-layer annular elastic member, which can be selected from ordinary stop ring 9, double-layer stop ring 9, wave spring and butterfly spring, and the material of the stop ring 9 is not limited to stainless steel. Due to the gap, the stop ring 9 can be compressed to reduce the radial dimension during installation, so as to extend from the rotor sleeve 6 to the installation position.

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

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

[0037] The working principle of the electric control brake system transmission mechanism is as follows: the ball screw 2 is coaxially arranged with the rotor 5, the rotor sleeve 6 is welded with the motor base 3, the motor base 3 is provided with a boss 301 supporting the rotor sleeve 6, after being electrified, the rotor 5 of the motor 1 rotates to drive the motor base 3 to rotate, the motor base 3 is fixedly connected with the outer spline sleeve 13, the inner spline sleeve 12 transmits torque with the outer spline sleeve 13 through spline, the inner spline sleeve 12 is press-fitted with the screw shaft 202, the rotor 5 transmits 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 nut 201 of the screw shaft 202 to advance or retreat, so that the plunger 11 is pressurized or depressurized. In the above process, the retaining ring 9 is arranged between the boss 301 and the baffle 8, the inner diameter of the retaining ring 9 is greater than the outer diameter of the baffle 8, the outer diameter of the retaining ring 9 is greater than the inner diameter of the boss 301 of the motor base 3, the position of the retaining ring 9 is stable, the axial movement of the screw shaft is prevented, the ball screw 2 and the associated components are axially limited; at the same time, the rubber pad 7 is arranged between the gasket 10 and the baffle 8, which plays a buffering role for the transmission mechanism.

[0038] Embodiment: the motor 1 adopts a brushless motor 1, after being electrified, input torque is provided to realize the rotation of the rotor 5, the rotor sleeve 6 and the motor base 3, the motor base 3 transmits torque to the screw shaft 202 through spline transmission, the torque transmission drives the ball screw 2 to move linearly, the screw nut 201 is fixedly connected with the plunger 11, under the drive of the screw nut 201, the plunger 11 moves linearly to complete pressurization / depressurization, so as to realize the control of the hydraulic brake system.

[0039] The assembly process of the retaining ring 9 is as follows: Figure 4-1 For the first stage of the assembly process of the retaining ring 9, the motor 1 is assembled into the tool base 19, the tool pressing plate 20 is press-fitted into the tool base 19, the tool pressing plate 20 is designed to have a taper structure, the opening is larger than the size of the straight section, the retaining ring 9 is naturally assembled into the opening of the tool pressing plate 20, the installation block one 21 is pressed into the straight section against the retaining ring 9, after the installation block one 21 completes the effective stroke of pressing, the second stage of the assembly process of the retaining ring 9 is entered. Figure 4-2 The second stage of the assembly process of the retaining ring 9 is entered, at this time, the installation block two 22 is pressed against the retaining ring 9, until the retaining ring 9 contacts with the baffle 8, the retaining ring 9 is continuously pressed, the rubber pad 7 is in a compressed state, until the other side of the retaining ring 9 is completely separated from the boss 301 of the motor base 3, the retaining ring 9 recovers from the compressed state to the natural state in the radial direction, and is still in the compressed state in the axial direction, one side of the retaining ring 9 contacts with the motor base 3, and the other side contacts with the baffle 8, the whole system is in a stable state, the ball screw 2 and the associated components are axially limited, so that the ball screw 2 and the associated components are prevented from being separated from the motor 1.

[0040] Compared with the prior art, the electric control brake system transmission mechanism optimizes the limiting structure of the transmission mechanism shaft system components, simplifies the structure of the baffle 8, reduces the number of parts, reduces the cost, the baffle 8 forming process is simple, and the manufacturing and processing cost is reduced; the boss 301 is designed in the motor base 3, the retaining ring 9 is limited between the boss 301 and the baffle 8, the retaining ring 9 is reasonably arranged, the axial movement of the transmission mechanism can be effectively prevented, the axial reliable limiting of the ball screw 2 and the associated components is realized; the retaining ring 9 is reasonably designed, the assembly difficulty is reduced, and the assembly efficiency is improved; the components are reasonably arranged, the connection is reliable, the overall structure transmission is reliable, and the operation is stable.

[0041] The utility model has been described exemplarily above in combination with the drawings. Apparently, the specific implementation of the utility model is not limited by the above-mentioned mode. As long as various non-essential improvements are made by adopting the method concept and technical scheme of the utility model; or the above-mentioned concept and technical scheme of the utility model are directly applied to other occasions without improvement, all are within the protection scope of the utility model.

Claims

1. An electrically controlled brake system transmission mechanism characterized by: The utility model provides an electric machine, the electric machine includes motor (1), the motor (1) includes rotor (5), the rotor (5) is connected with rotor sleeve (6), be equipped with motor base (3) in the motor (1), rotor sleeve (6) one end is fixedly connected with motor base (3), still be equipped with ball screw (2) in the motor (1), ball screw (2) includes screw shaft (202) and nut (201), screw shaft (202) is cooperated with nut (201), screw shaft (202) one end is located in motor base (3) and is contacted with motor base (3), be equipped with the limiting structure between motor base (3) and screw shaft (202) and keep ball screw from loosing, nut (201) is connected with plunger (11), and plunger (11) is from the motor (1) stretches out.

2. An electrically controlled brake system transmission mechanism according to claim 1, characterized in that: The limiting structure includes boss (301), the boss (301) is equipped in the inside of one end of the motor base (3), the baffle (8) is sleeved on the screw shaft (202), the stop ring (9) is equipped between the boss (301) and the baffle (8), the stop ring (9) both sides are contacted with boss (301) one side and baffle (8) end face respectively, the rotor sleeve (6) end part is inserted into the motor base (3) and is contacted with the other side of boss (301), and the rotor sleeve (6) is fixedly connected with the motor base (3).

3. An electrically controlled brake system transmission mechanism according to claim 2, characterized in that: The screw shaft (202) includes support journal (203), the inner spline sleeve (12) is equipped on the support journal (203), the inner spline sleeve (12) is interference fit with the screw shaft (202), the outer spline sleeve (13) is equipped on the outer periphery of the inner spline sleeve (12), the outer spline sleeve (13) is located in the motor base (3), and the outer spline sleeve (13) is interference fit with the motor base (3), and the outer spline sleeve (13) is connected with the inner spline sleeve (12).

4. An electrically controlled brake system transmission mechanism according to claim 3, characterized in that: The first step (14) is equipped on the inner spline sleeve (12), the gasket (10) is equipped on the first step (14), the rubber pad (7) is equipped between the baffle (8) and the gasket (10), the second step (15) is equipped on the baffle (8), the rubber pad (7) is sleeved on the second step (15), and the stop ring (9), the baffle (8), the rubber pad (7) and the gasket (10) are coaxially arranged in sequence.

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

6. An electrically controlled brake system transmission mechanism according to claim 5, characterized in that: The nut (201) is located in the rotor sleeve (6), and the screw thread is arranged on the inner side of the end of the nut (201) and the end of the plunger (11).

7. An electrically controlled brake system transmission mechanism according to claim 3, characterized in that: The end of the support journal (203) is a spherical surface structure, the arc-shaped groove (302) is arranged in the middle of the motor base (3), and the end of the support journal (203) is in contact with the arc-shaped groove (302).

8. The electrically controlled brake system transmission mechanism according to claim 5, characterized by: The stop ring (9) is a double-layer stop ring, and a gap is arranged between the two ends of the stop ring (9).

9. An electrically controlled brake system transmission mechanism according to claim 7, characterized in that: The motor (1) comprises a motor shell (18), the motor shell (18) is respectively provided with a first bearing (16) and a second bearing (17) at both ends, the outer side of the first bearing (16) and the second bearing (17) is fixedly connected with the motor shell (18), the motor base (3) is fixedly connected with the inner side of the first bearing (16), and the rotor sleeve (6) is fixedly connected with the inner side of the second bearing (17).

10. An electrically controlled brake system transmission mechanism according to claim 9, characterized in that: The motor shell (18) is externally provided with an assembly tool, the assembly tool comprises a tool base (19), one side of the tool base (19) is provided with a tool pressing plate (20), the middle of the tool pressing plate (20) is provided with a mounting block, and one end of the mounting block is abutted with a check ring (9).

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