Low-cost transmission mechanism suitable for novel electric control booster

Abstract

The utility model relates to a low-cost transmission mechanism suitable for a novel electric control booster, and belongs to the field of automobile braking systems. The controller and the cylinder body are fixedly connected with the valve body, a motor rotor of the motor is in threaded connection with the lead screw in the axial direction through a screw, the motor rotor is in small clearance fit with the rectangular tail of the lead screw in the radial direction through a rectangular hole, and the anti-rotation sleeve is in interference fit with the valve body in the radial direction and matched with the nut through a groove structure. And the piston is in threaded connection with the external thread of the nut. The anti-rotation structure has the advantages that the structure is novel, the structure that the motor rotor and the lead screw are connected through the screw and the rectangular groove and the structure that the nut and the piston are in threaded connection are adopted, the nut anti-rotation structure for converting the rotation motion of the nut into the linear motion of the piston is achieved, and connection and force transmission of the motor and the hydraulic cylinder are achieved; and meanwhile, the structure and the process are simple, the cost is low, the overall size is small after the assembly is assembled, and the loading space is saved.

Description

Technical Field

[0001] The utility model belongs to the field of automobile braking systems, and in particular relates to a connection structure of a motor, a hydraulic cylinder and a piston suitable for a novel electric control booster. Background Art

[0002] With the growing development of new energy vehicles, the traditional automotive parts field is facing major innovations. Traditional vacuum boosters are gradually withdrawing from the market and being replaced by electronically controlled booster products. Therefore, it is necessary to control the motor through the controller on the electronically controlled booster through the input electrical signal of the pedal, and transmit the output torque of the motor to the hydraulic cylinder through the transmission mechanism. The brake fluid in the hydraulic cylinder passes through the pipe on the valve body and the solenoid valve on it, and finally transmits the required brake hydraulic pressure to the brake wheel cylinder through the brake pipeline of the whole vehicle to achieve the purpose of braking the whole vehicle. At present, the products in the industry have complex connections between the motor and the hydraulic cylinder, the structure of transmitting force, and the assembly process, and the cost is relatively high. Summary of the invention

[0003] The utility model provides a low-cost transmission mechanism suitable for a novel electric-controlled booster, aiming to ensure that a motor stably and reliably transmits force to a hydraulic cylinder through torque.

[0004] The technical solution adopted by the utility model is to include a controller, a cylinder body, a valve body, a piston, an anti-rotation sleeve, a nut of a ball screw, a motor, a screw and a lead screw of the ball screw, wherein the controller and the cylinder body are fixedly connected to the valve body respectively, the motor rotor of the motor is axially connected to the lead screw of the ball screw through a screw thread, the motor rotor is radially matched with a small gap at the rectangular tail of the lead screw of the ball screw through a rectangular hole, the anti-rotation sleeve is radially interference connected with the valve body, the anti-rotation sleeve is matched with the nut of the ball screw through a groove structure, and the piston is threadedly connected to the external thread of the nut of the ball screw.

[0005] The front end of the piston adopts an internal hexagonal structure for limiting the position of the piston and the nut when they are assembled, and the rear end adopts an internal thread for matching with the external thread of the nut.

[0006] The end of the anti-rotation sleeve adopts a straight-grain structure, which plays an anti-rotation role with the valve body through interference riveting. The sleeve body is provided with a groove, and the end of the groove is a guide port.

[0007] The angle of the guide opening is not less than 30°.

[0008] The nut is provided with a boss structure, which cooperates with the anti-rotation sleeve through a groove structure to realize the axial movement of the nut. The nut adopts an external thread to cooperate with the internal thread of the piston.

[0009] The end face of the boss structure is a guide surface, the angle of the guide surface is not less than 20°, and the length is not less than 4 mm.

[0010] The front end of the screw rod adopts an inner hexagonal end structure, which is used for limiting the position of the screw rod, the motor rotor and the screw during assembly, and the rear end adopts a rectangular tail.

[0011] The utility model has the advantages of novel structure, adopts the structure of connecting the motor rotor and the ball screw through screws and rectangular grooves, the structure of threaded connection between the nut of the ball screw and the piston, and the nut anti-rotation structure that converts the rotational motion of the nut of the ball screw into the linear motion of the piston, thereby achieving the connection between the motor and the hydraulic cylinder and transmitting force. Compared with the traditional structure, it has better assembly and processability, and at the same time, the structure and process are simple, the cost is low, the overall volume is small after assembly, and the loading space is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the ball screw of the utility model;

[0014] Figure 3 It is a top view of the ball screw of the utility model;

[0015] Figure 4 It is a structural schematic diagram of the motor rotor of the utility model;

[0016] Figure 5 It is a structural schematic diagram of the anti-rotation sleeve of the utility model;

[0017] Figure 6 It is a top view of the anti-rotation sleeve of the utility model;

[0018] Figure 7 It is a structural schematic diagram of the piston of the utility model. DETAILED DESCRIPTION

[0019] like Figure 1 , 4 As shown, it includes a controller 1, a cylinder body 2, a valve body 3, a piston 4, an anti-rotation sleeve 5, a nut 6 of a ball screw, a motor 7, a screw 8, and a lead screw 9 of a ball screw, wherein the controller 1 and the cylinder body 2 are fixedly connected to the valve body 3 respectively, the motor rotor 7.1 of the motor 7 is threadedly connected to the lead screw 9 of the ball screw axially through the screw 8, the motor rotor 7.1 is radially matched with a small gap of the rectangular tail 9.2 of the lead screw 9 of the ball screw through a rectangular hole 7.1.1, the anti-rotation sleeve 5 is radially interference connected to the valve body 3, the anti-rotation sleeve 5 is matched with the nut 6 of the ball screw through a groove structure, and the piston 4 is threadedly connected to the external thread 6.2 of the nut 6 of the ball screw.

[0020] like Figure 7As shown, the front end of the piston 4 adopts an internal hexagonal structure 4.2 for limiting the position of the piston 4 and the nut 6 when the piston 4 is assembled, and the rear end adopts an internal thread 4.1 for matching with the external thread 6.2 of the nut 6.

[0021] like Figure 5 As shown, the end of the anti-rotation sleeve 5 adopts a straight-grain structure 5.1, which plays the role of interference riveting with the valve body 3 to prevent rotation. There is a groove 5.2 on the sleeve body, and the end of the groove 5.2 is a guide port 5.3.

[0022] like Figure 6 As shown, the angle of the guide opening 5.3 is not less than 30°.

[0023] like Figure 2 As shown, the nut 6 has a boss structure 6.1, which cooperates with the anti-rotation sleeve 5 through a groove structure 5.2 to achieve axial movement of the nut 6. The nut 6 adopts an external thread 6.2 to cooperate with the internal thread 4.1 of the piston 4.

[0024] like Figure 3 As shown, the end face of the boss structure 6.1 is a guide surface 6.3, the angle of the guide surface is not less than 20°, and the length is not less than 4 mm.

[0025] like Figure 2 As shown, the front end of the screw rod 9 adopts an inner hexagonal end structure 9.1, which is used for limiting the screw rod 9, the motor rotor 7.1 and the screw 8 during assembly, and the rear end adopts a rectangular tail 9.2.

[0026] How it works

[0027] The valve body 3 is the carrier of the motor 7, the cylinder body 2, the controller 1, the solenoid valve, the hydraulic oil circuit, etc. When the electric control booster is working, it collects relevant signals through sensors such as stroke, hydraulic pressure, and torque and transmits them to the controller 1. The controller 1 controls the motor 7 to drive the ball screw 9 to rotate, and pushes the nut 6 of the ball screw to drive the piston 4 to move axially under the radial limit of the anti-rotation sleeve 5, thereby generating braking pressure in the cylinder body 2, achieving the connection between the motor and the hydraulic cylinder and transmitting force.

Claims

1. A low-cost transmission mechanism suitable for a new type of electronically controlled booster, characterized in that: It includes a controller, a cylinder body, a valve body, a piston, an anti-rotation sleeve, a nut of a ball screw, a motor, a screw and a lead screw of the ball screw, wherein the controller and the cylinder body are fixedly connected to the valve body respectively, the motor rotor of the motor is axially connected to the lead screw of the ball screw through a screw thread, the motor rotor is radially matched with a small gap at the rectangular tail of the lead screw of the ball screw through a rectangular hole, the anti-rotation sleeve is radially interference connected to the valve body, the anti-rotation sleeve is matched with the nut of the ball screw through a groove structure, and the piston is threadedly connected to the external thread of the nut of the ball screw.

2. A low-cost transmission mechanism suitable for a new type of electronically controlled booster according to claim 1, characterized in that: The front end of the piston adopts an internal hexagonal structure for limiting the position of the piston and the nut when they are assembled, and the rear end adopts an internal thread for matching with the external thread of the nut.

3. A low-cost transmission mechanism suitable for a new type of electronically controlled booster according to claim 1, characterized in that: The end of the anti-rotation sleeve adopts a straight-grain structure, which plays an anti-rotation role with the valve body through interference riveting. The sleeve body is provided with a groove, and the end of the groove is a guide port.

4. A low-cost transmission mechanism suitable for a new type of electronically controlled booster according to claim 3, characterized in that: The angle of the guide opening is not less than 30°.

5. A low-cost transmission mechanism suitable for a new type of electronically controlled booster according to claim 1, characterized in that: The nut is provided with a boss structure, which cooperates with the anti-rotation sleeve through a groove structure to realize the axial movement of the nut. The nut adopts an external thread to cooperate with the internal thread of the piston.

6. A low-cost transmission mechanism suitable for a new type of electronically controlled booster according to claim 5, characterized in that: The end face of the boss structure is a guide surface, the angle of the guide surface is not less than 20°, and the length is not less than 4 mm.

7. A low-cost transmission mechanism suitable for a new type of electronically controlled booster according to claim 1, characterized in that: The front end of the screw rod adopts an inner hexagonal end structure, which is used for limiting the position of the screw rod, the motor rotor and the screw during assembly, and the rear end adopts a rectangular tail.

Images