Motor gear lead screw transmission mechanism of vehicle electronic control hydraulic brake booster

Abstract

The invention relates to a motor gear lead screw transmission mechanism of an electrically-controlled hydraulic brake booster for a vehicle, and belongs to the field of automobile brake systems. The first positioning sleeve is fixed to the valve body through screws, the inner gear ring, the planet wheel, the front gear pad and the rear gear pad are assembled in an inner space formed by a front shell of the motor and the first positioning sleeve, one end of the lead screw piston component is positioned through the first positioning sleeve, and the other end of the lead screw piston component is positioned through the hydraulic cylinder. The front end of the rotor shaft is radially limited through the second positioning sleeve. The electric control booster has the advantages that the structure is novel, the planetary gear mechanism is positioned and assembled on the front shell of the motor, and additional planetary gear fixing parts are reduced compared with the conventional product, so that the assembly space is saved, the axial length of the product is shortened, and the electric control booster can be applied to an electric control booster product needing an electric control strategy of reciprocating pressure building; the system can be applied to conventional braking, brake-by-wire, active collision avoidance, self-adaptive cruise, intelligent driving and braking energy recovery systems.

Description

Technical Field

[0001] The present invention belongs to the field of automobile braking systems, and in particular relates to a motor gear screw transmission mechanism of an electronically controlled hydraulic brake booster for a vehicle. Background Art

[0002] With the growing development of new energy vehicles, the traditional automotive parts sector is facing major innovations. As traditional fuel engines are gradually replaced by batteries, coupled with the demand for electrification and intelligent driving, traditional vacuum boosters are gradually being phased out of the market, replaced by electronically controlled boosters.

[0003] The electronically controlled booster product receives the displacement sensor through the controller to sense the brake pedal stroke signal of the entire vehicle, and at the same time transmits the force to the hydraulic cylinder by controlling the output torque of the motor. The brake fluid in the hydraulic cylinder transmits the hydraulic pressure to the brake wheel cylinder through the brake pipeline, thereby achieving the purpose of braking the entire vehicle.

[0004] Current industry products use motors to transmit torque to hydraulic cylinders via structures such as rack and pinion gears, worm gears, and ball screws. While transmission structures primarily based on ball screws and planetary gears offer high efficiency, the planetary gears themselves require fixed components, which occupies assembly space and increases the product's axial length, leading to complex structures and high manufacturing and assembly costs. Summary of the Invention

[0005] The present invention is a transmission mechanism with a planetary gear train suitable for a novel electronically controlled booster, which solves the problem that the planetary gear fixing mechanism is complex, resulting in high manufacturing and assembly process costs.

[0006] The technical solution adopted by the present invention is: it includes a motor, a positioning sleeve 1, an inner ring gear, a planetary gear, a sun gear, a front gear pad, a positioning sleeve 2, a rear gear pad, and a screw piston component, wherein the positioning sleeve 1 is fixed to the valve body by screws, the inner ring gear, the planetary gear, the front gear pad, and the rear gear pad are assembled in the internal space formed by the front shell of the motor and the positioning sleeve 1, one end of the screw piston component is positioned by the positioning sleeve 1, and the other end is positioned by the hydraulic cylinder, the sun gear is radially interference riveted on the rotor shaft of the motor, and the front end of the rotor shaft is radially limited by the positioning sleeve 2.

[0007] The front shell of the motor is provided with an inner gear ring anti-rotation groove, which corresponds to the boss on the inner gear ring and is assembled with a small interference fit. The inner gear ring anti-rotation groove has an anti-rotation effect on the inner gear ring, so that the inner gear ring will not rotate in the working state.

[0008] The screw holes in the positioning sleeve 1 are used for assembling screws to fix the positioning sleeve 1 on the valve body. The positioning sleeve 1 is provided with a motor PIN clearance hole.

[0009] The front gear pad is made of plastic and is provided with a planetary pin hole for matching with the planetary pin.

[0010] The rear gear pad is made of plastic material and has a rear gear pad boss which cooperates with the anti-rotation groove of the inner gear ring of the motor to prevent the rear gear pad from rotating.

[0011] The screw piston component includes a screw rod, a planetary pin, a limit pin, a nut, a small screw, an outer ring of a bearing, a piston component, a small cylindrical pin and a large cylindrical pin, wherein the planetary pin is fastened to the screw rod, the nut is threadedly connected to the piston component, and the two are positioned by a small screw, the limit pin is interference-fastened with the screw rod, and one end protrudes and cooperates with the nut boss to limit the position, ensuring that the nut does not contact the inner end face of the screw rod during the return stroke, and the small cylindrical pin passes through the U-shaped groove on the outer ring of the bearing to prevent rotation of the outer ring of the bearing, and the other end of the small cylindrical pin is fixed to the valve body, the upper semicircle of the large cylindrical pin is fixed to the valve body, and the lower semicircle cooperates with the R-shaped groove on the piston component to radially limit the piston component to achieve linear motion on the axis.

[0012] The inner ring gear, planetary gear and sun gear constitute a planetary gear train, wherein the inner hole of the planetary gear is assembled on the planetary pin of the screw piston component with a small clearance. When the sun gear rotates, the planetary gear rotates on the planetary pin and simultaneously revolves in the inner ring gear to drive the screw of the screw piston component to rotate.

[0013] The motor, transmission mechanism and hydraulic cylinder are fixed on the valve body with the valve body as the carrier and the axes thereof are coaxially fixed on the valve body by screws or fastening glue.

[0014] The valve body includes a hydraulic channel connected to the liquid storage tank, the electromagnetic valve, the simulation cylinder and the brake pipeline of the entire vehicle.

[0015] The advantages of the present invention are its novel structure. Based on the motor transmitting torque to the hydraulic cylinder through the ball screw and related transmission mechanism parts, the design and optimization are carried out, and the planetary gear mechanism is positioned and assembled on the front housing of the motor. Compared with previous products, the additional planetary gear fixing parts are reduced, thereby saving assembly space and shortening the axial length of the product. It is possible to provide a larger input force to the hydraulic cylinder under a smaller output torque of the motor, thereby achieving the purpose of using a high-power and small-sized motor for the electronically controlled booster to achieve a larger output hydraulic pressure and stronger product compatibility. At the same time, the product is small in size, especially the axial dimension of the product is more compact than previous products, with lower cost and easier manufacturing and assembly processes. It can be applied to electronically controlled booster products that require electronic control strategies for reciprocating pressure building, as well as conventional braking, wire control braking, active collision avoidance, adaptive cruise control, intelligent driving and brake energy recovery systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2It is a structural schematic diagram of the front housing and rotor shaft of the motor of the present invention; Figure 3 yes Figure 2 Left view of; Figure 4 This is a structural diagram of the positioning sleeve 1 of the present invention; Figure 5 1 is a schematic structural diagram of the planetary gear system of the present invention; Figure 6 It is a schematic structural diagram of the front gear pad of the present invention; Figure 7 It is a schematic structural diagram of the rear gear pad of the present invention; Figure 8 It is a structural schematic diagram of the screw piston component of the present invention; Figure 9 It is a structural schematic diagram of the present invention and the hydraulic cylinder assembled on the valve body. DETAILED DESCRIPTION

[0017] See also Figure 1 , including motor 1, locating sleeve 1 2, inner gear ring 3, planetary gear 4, sun gear 5, front gear washer 6, locating sleeve 2 7, rear gear washer 8, and screw piston component 9, wherein locating sleeve 1 2 is fixed to valve body 10 by screw 2.1, inner gear ring 3, planetary gear 4, front gear washer 6, and rear gear washer 8 are assembled in the internal space formed by front housing 1.1 and locating sleeve 1 2 of motor 1, one end of screw piston component 9 is positioned by locating sleeve 1 2, and the other end is positioned by hydraulic cylinder 11, sun gear 5 is radially interference riveted to rotor shaft 1.2 of motor 1, and the front end of rotor shaft 1.2 is radially limited by locating sleeve 2 7.

[0018] See also Figure 2 、 3 5. The front housing 1.1 of the motor 1 is provided with an inner gear ring anti-rotation groove 1.3, which corresponds to the boss 3.1 on the inner gear ring 3 and is assembled with a small interference fit. The inner gear ring anti-rotation groove 1.3 has an anti-rotation effect on the inner gear ring 3, so that the inner gear ring 3 will not rotate in the working state.

[0019] See also Figure 4 The screw hole 2.2 in the positioning sleeve 2 is used to assemble the screw 2.1 to fix the positioning sleeve 2 on the valve body 10. There is a motor PIN clearance hole 2.3 on the positioning sleeve 2.

[0020] See also Figure 6 、 8 The front gear pad 6 is made of plastic and has a planetary pin hole 6.1 thereon, which cooperates with the planetary pin 5.2.

[0021] See also Figure 7 、 3The rear gear pad 8 is made of plastic, and has a rear gear pad boss 8.1 thereon that cooperates with the motor's inner gear ring anti-rotation groove 1.3 to prevent the rear gear pad 8 from rotating.

[0022] See also Figure 8 The screw piston component 9 includes a screw 9.1, a planetary pin 9.2, a limit pin 9.3, a nut 9.4, a small screw 9.5, a bearing outer ring 9.6, a piston component 9.7, a small cylindrical pin 9.8 and a large cylindrical pin 9.9, wherein the screw 9.1 is fastened with a planetary pin 9.2, and the planetary pin 9.2 is used to assemble the planetary gear 4. The planetary gear 4 is driven to rotate by the sun gear 5. At the same time, under the limit of the inner gear ring 3, the planetary pin 9.2 is driven to rotate axially around the screw 9.1, thereby driving the screw 9.1 to rotate along its central axis. The nut 9.4 is threadedly connected to the piston component 9.7 and is screwed by a small screw. 9.5 positions the two to prevent them from loosening. The limit pin 9.3 is tightly fitted with the screw rod 9.1 with an interference fit. One end protrudes and cooperates with the nut boss 9.4.1 to limit the position, ensuring that the nut 9.4 does not contact the inner end face of the screw rod during the return stroke. The small cylindrical pin 9.8 passes through the U-shaped groove 9.6.1 on the bearing outer ring 9.6 to prevent the bearing outer ring 9.6 from rotating. The other end of the small cylindrical pin 9.8 is fixed to the valve body 10. The upper semicircle of the large cylindrical pin 9.9 is fixed to the valve body 3, and the lower semicircle cooperates with the R-shaped groove 9.7.1 on the piston component 9.7 to radially limit the piston component 9.7 to achieve linear motion on the axis.

[0023] See also Figure 5 、 8 The inner ring gear 3, planetary gear 4 and sun gear 5 constitute a planetary gear train, wherein the inner hole of the planetary gear 4 is assembled on the planetary pin 9.2 of the screw piston component 9 with a small clearance fit. When the sun gear 5 rotates, the planetary gear 4 rotates on the planetary pin 9.2 and at the same time revolves in the inner ring gear 3 to drive the screw 9.1 of the screw piston component 9 to rotate.

[0024] See also Figure 9 The motor 1, transmission mechanism 2 and hydraulic cylinder 11 are fixed to the valve body 10 coaxially with screws or fasteners using the valve body 10 as a carrier.

[0025] See also Figure 9 The valve body 10 includes a hydraulic channel connected to the liquid storage tank 10.1, the solenoid valve 10.2, the simulation cylinder 10.3 and the vehicle brake pipeline.

[0026] How it works When the product is not in operation, the liquid pressure in the hydraulic cylinder is zero. When the hydraulic cylinder needs to build pressure on the outward stroke or release pressure on the return stroke, the controller controls the input current of the motor, causing the motor rotor to rotate counterclockwise or clockwise, simultaneously driving the sun gear on the motor rotor shaft to rotate in the corresponding direction. The transmission mechanism transmits force to the piston in the hydraulic cylinder to achieve linear motion, achieving pressure buildup on the outward stroke and pressure relief on the return stroke.

[0027] Using motor 1 as the power source, the rotation of the motor rotor shaft 1.2 causes the sun gear 5 fixed to it to rotate; the sun gear 5 drives the planetary gears 4 to rotate and revolve around the sun gear 5 along the inner ring gear 3; while the planetary gears 4 revolve around the sun gear 5, they drive the three planetary pins 9.2 fixed to the screw rod 9.1, which drives the screw rod 9.1 to rotate in the bearing outer ring 9.6; the rotation of the screw rod 9.1 drives the nut 9.4 to move, and the nut 9.4 is fixed to the piston component 9.7. The piston R-shaped groove 9.7.1, guided by the large cylindrical pin 9.8, realizes the linear motion of the nut 9.4 and the piston component 9.7 to build up pressure on the outward stroke and relieve pressure on the return stroke synchronously, thereby achieving the purpose of building up pressure on the outward stroke and relieving pressure on the return stroke of the piston component 9.7 in the hydraulic cylinder 11.

Claims

1. A motor gear screw transmission mechanism for an electronically controlled hydraulic brake booster for a vehicle, characterized by: It includes a motor, a positioning sleeve 1, an inner gear ring, a planetary gear, a sun gear, a front gear pad, a positioning sleeve 2, a rear gear pad, and a screw piston component, wherein the positioning sleeve 1 is fixed to the valve body by screws, the inner gear ring, the planetary gear, the front gear pad, and the rear gear pad are assembled in the internal space formed by the front shell of the motor and the positioning sleeve 1, one end of the screw piston component is positioned by the positioning sleeve 1, and the other end is positioned by the hydraulic cylinder, the sun gear is radially interference riveted on the rotor shaft of the motor, and the front end of the rotor shaft is radially limited by the positioning sleeve 2.

2. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 1, characterized in that: The front shell of the motor is provided with an inner gear ring anti-rotation groove, which corresponds to the boss on the inner gear ring and is assembled with a small interference fit. The inner gear ring anti-rotation groove has an anti-rotation effect on the inner gear ring, so that the inner gear ring will not rotate in the working state.

3. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 1, characterized in that: The screw holes in the positioning sleeve 1 are used for assembling screws to fix the positioning sleeve 1 on the valve body. The positioning sleeve 1 is provided with a motor PIN clearance hole.

4. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 1, characterized in that: The front gear pad is made of plastic and is provided with a planetary pin hole for matching with the planetary pin.

5. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 1, characterized in that: The rear gear pad is made of plastic material and has a rear gear pad boss which cooperates with the anti-rotation groove of the inner gear ring of the motor to prevent the rear gear pad from rotating.

6. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 1, characterized in that: The screw piston component includes a screw rod, a planetary pin, a limit pin, a nut, a small screw, an outer ring of a bearing, a piston component, a small cylindrical pin and a large cylindrical pin, wherein the planetary pin is fastened to the screw rod, the nut is threadedly connected to the piston component, and the two are positioned by a small screw, the limit pin is interference-fastened with the screw rod, and one end protrudes and cooperates with the nut boss to limit the position, ensuring that the nut does not contact the inner end face of the screw rod during the return stroke, and the small cylindrical pin passes through the U-shaped groove on the outer ring of the bearing to prevent rotation of the outer ring of the bearing, and the other end of the small cylindrical pin is fixed to the valve body, the upper semicircle of the large cylindrical pin is fixed to the valve body, and the lower semicircle cooperates with the R-shaped groove on the piston component to radially limit the piston component to achieve linear motion on the axis.

7. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 6, characterized in that: The inner ring gear, planetary gear and sun gear constitute a planetary gear train, wherein the inner hole of the planetary gear is assembled on the planetary pin of the screw piston component with a small clearance. When the sun gear rotates, the planetary gear rotates on the planetary pin and simultaneously revolves in the inner ring gear to drive the screw of the screw piston component to rotate.

8. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 1, characterized in that: The motor, transmission mechanism and hydraulic cylinder are fixed on the valve body with the valve body as the carrier and the axes thereof are coaxially fixed on the valve body by screws or fastening glue.

9. The motor gear screw transmission mechanism of the vehicle electronically controlled hydraulic brake booster according to claim 8, characterized in that: The valve body includes a hydraulic channel connected to the liquid storage tank, the electromagnetic valve, the simulation cylinder and the brake pipeline of the entire vehicle.

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