Electric control booster

Abstract

The invention relates to an electric control booster, and belongs to the field of automobile brake systems. Comprising a motor, a transmission system, a valve body and a hydraulic cylinder, the motor, the transmission system and the hydraulic cylinder take the valve body as a carrier, the axis of the motor, the transmission system and the hydraulic cylinder are coaxially fixed on the valve body through screws or fastening glue, one end of the transmission system fixes a first positioning sleeve on the valve body through screws, and the first positioning sleeve is connected with a cylinder body cover through a first small screw. The planetary gear train and the lead screw piston component are limited in the cylinder body cover, a sun gear of the planetary gear train is riveted to a motor rotor shaft in a radial interference mode, the front end of the motor rotor shaft is limited in the radial direction through a second positioning sleeve, and the lead screw piston component is in axial sliding fit with the hydraulic cylinder. The hydraulic cylinder has the advantages that the structure is novel, large input force is provided for the hydraulic cylinder under the small output torque of the motor through a planetary gear train in the speed reducing mechanism, the product size is small, the transmission efficiency is high, the cost is low, and the manufacturing and assembling process is easy to achieve.

Description

Technical Field

[0001] The invention belongs to the field of automobile braking systems, and in particular relates to an electronically controlled booster adopting a new transmission system. Background Art

[0002] With the increasing development of new energy vehicles, the field of traditional auto parts is facing major innovations. Traditional fuel engines are gradually being replaced by batteries, and with the development needs of electrification and intelligence, traditional vacuum boosters are gradually withdrawing from the market and are gradually being replaced by electronically controlled booster products.

[0003] The electronically controlled booster product is a product that receives the displacement sensor of the controller and senses the brake pedal stroke signal of the vehicle. It 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 to achieve the purpose of braking the vehicle. In the current products in the industry, the motor transmits the torque to the hydraulic cylinder based on the structure of gear rack, worm gear and ball screw. Among them, the transmission structure with gear rack and worm gear as the main parts is both complex and inefficient. The transmission structure with ball screw as the main part is gradually adopted, but there are still problems such as large size, poor product compatibility and transmission efficiency that needs to be further improved. Summary of the invention

[0004] The present invention provides an electronically controlled booster to solve the problem of how to provide a larger input force for a hydraulic cylinder under a smaller output torque of a motor, reduce the volume of the product, and improve the compatibility of the product.

[0005] The technical solution adopted by the present invention is: it includes a motor, a transmission system, a valve body and a hydraulic cylinder, wherein the motor, the transmission system and the hydraulic cylinder use the valve body as a carrier, and the axes are coaxially fixed to the valve body by screws or fasteners. One end of the transmission system fixes a positioning sleeve to the valve body by screws, and the positioning sleeve is connected to the cylinder cover by a small screw. The cylinder cover limits the planetary gear train and the screw piston component inside it, and the sun gear of the planetary gear train is radially interference riveted on the motor rotor shaft. The front end of the motor rotor shaft is radially limited by a positioning sleeve, and the screw piston component is axially slidingly matched with the hydraulic cylinder.

[0006] The structure of the positioning sleeve 1 includes a small screw hole, a screw hole and a thread 1, wherein the small screw hole is used to assemble the small screw 1, the screw hole is used to assemble the screw, and the thread 1 cooperates with the cylinder cover thread.

[0007] The planetary gear system includes an inner gear ring, a planetary wheel, a sun gear and a boss, wherein the inner hole of the sun gear is tightly fitted with the motor rotor shaft through interference, the inner hole of the planetary wheel is assembled on the planetary pin with a small clearance, the boss on the inner gear ring is transitionally fitted with the limiting groove on the cylinder cover, and the planetary wheel rotates on the planetary pin when the sun gear rotates, and at the same time revolves in the inner gear ring to drive the screw to rotate.

[0008] The screw piston component includes a screw, a planetary pin, a limit pin, a nut, two small screws, an outer ring of a bearing, a piston component, a small cylindrical pin and a large cylindrical pin, wherein a planetary pin is fastened on the screw, the planetary pin is used to assemble a planetary gear, the nut is threadedly connected to the piston component, and the two are positioned by two small screws, the limit pin is interference fit with the screw, one end protrudes and cooperates with the boss of the nut to limit the position, one end of the small cylindrical pin is located in the U-shaped groove on the outer ring of the bearing, and the other end is fixed on the valve body, the upper semicircle of the large cylindrical pin is fixed on the valve body, and the lower semicircle cooperates with the R-shaped groove on the piston component.

[0009] The small cylindrical pin passes through the U-shaped groove on the outer ring of the bearing to prevent the outer ring of the bearing from rotating.

[0010] The lower semicircle of the large cylindrical pin cooperates with the R-shaped groove on the piston component to radially limit the piston component and realize linear motion on the axis.

[0011] The cylinder cover comprises a second thread, an annular groove, a supporting wall, a limiting groove and an internal hexagonal hole, wherein the thread cooperates with a thread of a positioning sleeve, a small screw is limited by the annular groove to prevent the axial thread of the cylinder cover from loosening, the end face of the supporting wall contacts the end face of the screw piston component, the limiting groove is used to limit the inner gear ring from rotating, and the internal hexagonal hole is used to assist the tool to rotate the cylinder cover.

[0012] The support wall plays a role in bearing axial force and forms a gear assembly space to prevent the inner gear ring and the planetary gear from being damaged by axial force.

[0013] The inner hexagonal hole is also a clearance hole of the sun gear.

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

[0015] The advantages of the present invention are novel structure, and the design and optimization are carried out on the basis that the motor transmits torque to the hydraulic cylinder through the ball screw and related transmission system parts. Through the transmission ratio of the planetary gear system (reduction mechanism) in the reduction mechanism, it is achieved to provide a larger input force to the hydraulic cylinder under a smaller output torque of the motor; the purpose of using a small-power and small-volume motor for the electronically controlled booster to achieve a larger output hydraulic pressure and stronger product compatibility is achieved; at the same time, the product is small in size, high in transmission efficiency, low in cost, and easy to manufacture and assemble. 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, intelligent driving and brake energy recovery systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the transmission system of the present invention; Figure 3 It is a structural schematic diagram of the positioning sleeve 1 of the present invention; Figure 4 It is a schematic structural diagram of the planetary gear system of the present invention; Figure 5 It is a structural schematic diagram of the screw piston component of the present invention; Figure 6 It is a structural schematic diagram of the cylinder cover of the present invention; Figure 7 yes Figure 6 AA section view. DETAILED DESCRIPTION

[0017] like Figure 1 , Figure 2 As shown, it includes a motor 1, a transmission system 2, a valve body 3 and a hydraulic cylinder 4, wherein the motor 1, the transmission system 2 and the hydraulic cylinder 4 use the valve body 3 as a carrier, and the axes are coaxially fixed to the valve body 3 by screws or fasteners, one end of the transmission system 2 fixes a positioning sleeve 202 to the valve body 3 by a screw 201, and the positioning sleeve 202 is connected to the cylinder cover 401 by a small screw 204, and the cylinder cover 401 limits the planetary gear train 203 and the screw piston component 206 inside it, and the sun gear 20303 of the planetary gear train is radially interference riveted on the motor rotor shaft 101, and the front end of the motor rotor shaft 101 is radially limited by a positioning sleeve 205, and the screw piston component 206 is axially slidably matched with the hydraulic cylinder 4.

[0018] like Figure 3 As shown, the structure of the positioning sleeve 202 includes a small screw hole 20201, a screw hole 20202 and a thread 20203, wherein the small screw hole 20301 is used to assemble a small screw 204, and the small screw 204 after tightening prevents the axial thread of the cylinder cover 401 from loosening, and the screw hole 20202 is used to assemble the screw 201 to fix the positioning sleeve 202 on the valve body 3, and the thread 20203 cooperates with the thread of the cylinder cover 401.

[0019] like Figure 4As shown, the planetary gear system 203 includes an inner ring gear 20301, a planetary wheel 20302, a sun wheel 20303 and a boss 20304, wherein the inner hole of the sun wheel 20303 is tightly fitted with the motor rotor shaft 101 by interference; the inner hole of the planetary wheel 20302 is assembled on the planetary pin 20602 with a small clearance fit; the boss 20304 on the inner ring gear 20301 is transitionally fitted with the limiting groove 40104 on the cylinder cover 401, and the limiting groove 40104 has an anti-rotation effect on the inner ring gear 20301; the inner ring gear 20301 does not rotate when the product is in working state, and the planetary wheel 20302 rotates on the planetary pin 20602 when the sun wheel 20303 rotates, and at the same time revolves in the inner ring gear 20301 to drive the screw rod 20601 to rotate.

[0020] like Figure 5 As shown, the screw piston component 206 includes a screw 20601, a planetary pin 20602, a limit pin 20603, a nut 20604, a small screw 20605, a bearing outer ring 20606, a piston component 20607, a small cylindrical pin 20608 and a large cylindrical pin 20609, wherein the screw 20601 is fastened with a planetary pin 20602, and the planetary pin 20602 is used to assemble the planetary gear 20302, and the planetary gear 20302 is driven to rotate by the sun gear 20303. At the same time, under the limit of the inner gear ring 20301, the planetary pin 20602 is driven to rotate around the screw 20601 axially, thereby driving the screw 20601 to rotate along its central axis, and the nut 20604 and the piston component 206 07 threaded connection, the two are positioned by small screw 20605 to prevent loosening, the limit pin 20603 is tightly fitted with the screw rod 20601, one end protrudes and cooperates with the nut boss 2060401 to limit, ensuring that the nut 20604 does not contact the inner end face of the screw rod during the return stroke, the small cylindrical pin 20608 passes through the U-shaped groove 2060601 on the bearing outer ring 20606 to prevent rotation of the bearing outer ring 20606, the other end of the small cylindrical pin 20608 is fixed on the valve body 3, the upper semicircle of the large cylindrical pin 20609 is fixed on the valve body 3, and the lower semicircle cooperates with the R-shaped groove 2060701 on the piston component 20607 to radially limit the piston component 20607 to achieve linear motion on the axis.

[0021] like Figure 6 , 7As shown, the cylinder cover 401 includes a thread 2 40101, an annular groove 40102, a support wall 40103, a limiting groove 40104 and an inner hexagonal hole 40105, wherein the thread 40101 cooperates with the thread 1 20203 of the positioning sleeve 1 202, and the small screw 1 204 is limited by the annular groove 40102 to prevent the axial thread of the cylinder cover 401 from loosening; the end face of the support wall 40103 contacts the end face of the screw piston component 206, plays an axial load-bearing role, and at the same time forms a gear assembly space to prevent the inner ring gear 20301 and the planetary gear 20302 from being damaged by axial force; the limiting groove 40104 is used to limit the inner ring gear 20301 from rotating, and the inner hexagonal hole 40105 is used to assist the tool to rotate the cylinder cover 401, and is also a clearance hole for the sun gear 20303.

[0022] like Figure 1 As shown, the valve body 3 includes a liquid storage tank 301, a solenoid valve 302, a simulation cylinder 303 and a hydraulic channel connected to the brake pipeline of the whole vehicle.

[0023] How it works The motor 1 is used as a power source. The rotation of the motor rotor shaft 101 causes the sun gear 20303 fixed thereto to rotate. The sun gear 20303 drives the planetary gear 20302 to rotate and revolve around the sun gear 20303 along the inner gear ring 20301. While the planetary gear 20302 revolves around the sun gear 20303, it drives three planetary pins 20602 fixed on the screw rod 20601 to drive the screw rod 20601 to rotate in the outer ring 20606 of the bearing. The rotation of the screw rod 20601 drives the nut 20604 to move. The nut 20604 is fixed to the piston component 20607. The piston R-shaped groove 2060701 realizes the linear motion of the nut 20604 and the piston component 20607 synchronously in the forward stroke to build up pressure and the return stroke to release pressure under the guidance of the large cylindrical pin 20609, so as to achieve the purpose of the piston component 20607 in the hydraulic cylinder 4 to build up pressure in the forward stroke and release pressure in the return stroke.

[0024] When the present invention is not working, the liquid pressure in the hydraulic cylinder is zero; when the hydraulic cylinder needs to build pressure in the outward stroke and release pressure in the return stroke, the controller controls the input current of the motor to make the motor rotor rotate counterclockwise or clockwise, and at the same time drives the sun gear on the motor rotor shaft to rotate in the corresponding direction, and transmits the force to the piston in the hydraulic cylinder through the transmission system to achieve the outward stroke pressure building and return stroke pressure relief of the hydraulic cylinder. Among them, the sun gear on the motor rotor shaft transmits the force to the ball screw through the planetary gear and the inner gear ring matched with it, and transmits the ball screw nut to output linear motion through the rotational motion of the ball screw; among them, the ball screw nut is tightly connected with the piston component of the hydraulic cylinder, and finally realizes the linear reciprocating motion of the piston in the hydraulic cylinder, and builds and releases the liquid pressure in the hydraulic cylinder.

Claims

1. An electric control booster, comprising a motor, a transmission system, a valve body and a hydraulic cylinder, wherein the motor, the transmission system and the hydraulic cylinder are fixed to the valve body coaxially by screws or fastening glue with the valve body as a carrier, and characterized in that: One end of the transmission system fixes a positioning sleeve on the valve body by screws, and the positioning sleeve is connected to the cylinder cover by small screws. The cylinder cover limits the planetary gear train and the screw piston component inside it. The sun gear of the planetary gear train is radially interference riveted on the motor rotor shaft, and the front end of the motor rotor shaft is radially limited by the positioning sleeve, and the screw piston component is axially slidably matched with the hydraulic cylinder.

2. An electronically controlled booster according to claim 1, characterized in that: The structure of the positioning sleeve 1 includes a small screw hole, a screw hole and a thread 1, wherein the small screw hole is used to assemble the small screw 1, the screw hole is used to assemble the screw, and the thread 1 cooperates with the cylinder cover thread.

3. The electronically controlled booster according to claim 1, characterized in that: The planetary gear system includes an inner gear ring, a planetary wheel, a sun gear and a boss, wherein the inner hole of the sun gear is tightly fitted with the motor rotor shaft through interference, the inner hole of the planetary wheel is assembled on the planetary pin with a small clearance, the boss on the inner gear ring is transitionally fitted with the limiting groove on the cylinder cover, and the planetary wheel rotates on the planetary pin when the sun gear rotates, and at the same time revolves in the inner gear ring to drive the screw to rotate.

4. The electronically controlled booster according to claim 1, characterized in that: The screw piston component includes a screw, a planetary pin, a limit pin, a nut, two small screws, an outer ring of a bearing, a piston component, a small cylindrical pin and a large cylindrical pin, wherein a planetary pin is fastened on the screw, the planetary pin is used to assemble a planetary gear, the nut is threadedly connected to the piston component, and the two are positioned by two small screws, the limit pin is interference fit with the screw, one end protrudes and cooperates with the boss of the nut to limit the position, one end of the small cylindrical pin is located in the U-shaped groove on the outer ring of the bearing, and the other end is fixed on the valve body, the upper semicircle of the large cylindrical pin is fixed on the valve body, and the lower semicircle cooperates with the R-shaped groove on the piston component.

5. The electronically controlled booster according to claim 4, characterized in that: The small cylindrical pin passes through the U-shaped groove on the outer ring of the bearing to prevent the outer ring of the bearing from rotating.

6. The electronically controlled booster according to claim 4, characterized in that: The lower semicircle of the large cylindrical pin cooperates with the R-shaped groove on the piston component to radially limit the piston component and realize linear motion on the axis.

7. The electronically controlled booster according to claim 1, characterized in that: The cylinder cover comprises a second thread, an annular groove, a supporting wall, a limiting groove and an internal hexagonal hole, wherein the thread cooperates with a thread of a positioning sleeve, a small screw is limited by the annular groove to prevent the axial thread of the cylinder cover from loosening, the end face of the supporting wall contacts the end face of the screw piston component, the limiting groove is used to limit the inner gear ring from rotating, and the internal hexagonal hole is used to assist the tool to rotate the cylinder cover.

8. The electronically controlled booster according to claim 7, characterized in that: The support wall plays a role in bearing axial force and forms a gear assembly space to prevent the inner gear ring and the planetary gear from being damaged by axial force.

9. The electronically controlled booster according to claim 7, characterized in that: The inner hexagonal hole is also a clearance hole of the sun gear.

10. The electronically controlled booster according to claim 1, characterized in that: The valve body comprises a liquid storage tank, a solenoid valve, a simulation cylinder and a hydraulic channel connected to the brake pipeline of the whole vehicle.

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