Electric control braking system

Abstract

The utility model discloses an electric control braking system which comprises a motor assembly, a transmission mechanism assembly, a piston assembly and a pressure buildup cylinder, the motor assembly is connected with the piston assembly through the transmission mechanism assembly, and the piston assembly and the transmission mechanism assembly are located in the pressure buildup cylinder. The motor assembly is movably connected with one end of the transmission mechanism assembly through a spherical structure or a spherical pair; when the coaxiality error is large after the motor and the pressure cylinder are assembled, the coaxiality of the piston and the pressure cylinder in the movement process can be adjusted, the radial force and movement friction of the piston and the pressure cylinder can be reduced, the influence of motor vibration on a transmission mechanism can be reduced, the transmission efficiency can be improved, and noise can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control braking, in particular to an electric control braking system. Background Art

[0002] In the prior art, for example, in an electric control braking system disclosed in patent document CN219268638U, the ball screw assembly and the bearing seat are interference fit, the axial direction is fixed with a rivet ring, the bearing seat and the hollow shaft are connected to form a whole by welding, and the piston and the pressure building cylinder are clearance fit.

[0003] In this scheme, when the coaxiality error of the motor and the boost cylinder assembly is too large, the piston is tilted relative to the boost cylinder bore, and the radial force on the piston and the boost cylinder bore during the non-coaxial movement will increase, resulting in increased friction between the piston and the boost cylinder bore during movement. This will increase energy loss during motion transmission and reduce transmission efficiency. When the radial force on the piston acts on the ball screw, a torque that causes the ball screw to tilt around a certain point is generated, which is called the overturning torque. The overturning torque will cause the axis of the nut and the screw shaft to deviate, resulting in uneven balls in the ball screw. The force is uniformly applied, and a few balls are squeezed with excessive force, which may lead to the crushing of the balls or permanent deformation of the raceways, increasing the risk of damage and failure of the ball screw. When the overturning moment is transmitted to the motor bearings through the screw shaft and the bearing seat, the motor bearings are subjected to relatively large radial forces, which may easily lead to damage to the motor bearings. Damage to the motor bearings affects the transmission of the motor and is prone to generate noise. In addition, because the bearing seat and the hollow shaft are welded together, the vibration of the motor transmission process will be directly transmitted to the ball screw assembly, and the vibration will affect the transmission efficiency of the transmission mechanism and increase the noise during the transmission process. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides an electric control braking system to achieve the purpose of automatically adjusting the coaxiality of the piston and the booster cylinder during the movement.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] The electric control braking system includes a motor assembly, a transmission mechanism assembly, a piston assembly and a pressure building cylinder. The motor assembly and the piston assembly are connected through the transmission mechanism assembly. The piston assembly and the transmission mechanism assembly are located in the pressure building cylinder. The motor assembly and one end of the transmission mechanism assembly are movably connected through a spherical structure or a spherical pair.

[0007] Further:

[0008] The motor assembly includes a motor base, and the transmission mechanism assembly includes a transmission mechanism rotating member. One end of the transmission mechanism rotating member and the motor base are movably connected via a spherical structure or a spherical pair.

[0009] The motor base and one end of the transmission mechanism rotating member are both provided with a groove structure, and the ball structure is located between the two groove structures.

[0010] A convex spherical surface is arranged at one end of the rotating part of the transmission mechanism, and an arc-shaped groove matching with the convex spherical surface is arranged on the motor base.

[0011] The motor base is provided with a convex spherical surface, and the end surface of one end of the rotating part of the transmission mechanism is provided with an arc-shaped groove matched with the convex spherical surface.

[0012] An elastic element for relatively pressing the transmission mechanism rotating part and the motor base is arranged between the transmission mechanism assembly and the motor assembly.

[0013] The piston assembly comprises a piston and a sliding bearing. The other end of the rotating part of the transmission mechanism is located in the piston. The sliding bearing is arranged on the piston and is clearance-matched with the pressure-building cylinder.

[0014] The convex spherical radius of the spherical structure or the spherical surface pair is smaller than the arc radius of the groove.

[0015] A retaining ring and a connecting sleeve are arranged at one end of the transmission mechanism rotating member, the motor base is spline-matched with the connecting sleeve, a retaining ring mounting groove matching with the outer edge of the retaining ring is arranged on the motor base, and the elastic element is arranged between the retaining ring and the connecting sleeve.

[0016] An annular step is provided at one end of the rotating member of the transmission mechanism, and a baffle is provided at the annular step corresponding to the baffle ring.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The electric control braking system is reasonably designed. The motor assembly and the transmission mechanism assembly are movably connected through a spherical structure or a spherical pair. When the coaxiality error between the motor and the booster cylinder is large after assembly, the coaxiality of the piston and the booster cylinder during movement can be adjusted to reduce the radial force and movement friction between the piston and the booster cylinder, and the influence of motor vibration on the transmission mechanism can be reduced, thereby improving transmission efficiency and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 This is a cross-sectional view of the structure of the electric control braking system of the utility model.

[0021] Figure 2It is an exploded schematic diagram of the transmission mechanism assembly structure of the utility model.

[0022] Figure 3 This is an exploded schematic diagram of the piston assembly structure of the utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the groove-type ball screw assembly of the utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the groove-type ball screw assembly of the utility model.

[0025] Figure 6 and Figure 7 This is a schematic diagram of the structure of the groove-shaped motor base of the utility model.

[0026] Figure 8 and Fig. 9 This is a schematic diagram of the structure of the convex spherical motor base of the utility model.

[0027] Fig.10 This is a schematic diagram of the working state of the brake system of the utility model when the groove contacts the ball and the pressure cylinder and the piston are coaxial with the motor.

[0028] Fig.11 This is a schematic diagram of the working state of the brake system when the groove of the utility model contacts the ball and the screw shaft rotates around the ball.

[0029] Fig.12 This is a schematic diagram of the working state of the braking system when the groove of the utility model contacts the ball and the lead screw shaft pushes the ball to roll radially.

[0030] Fig.13 This is a schematic diagram of the working state of the brake system of the utility model when the groove contacts the convex spherical surface and the pressure-building cylinder and the piston are coaxial with the motor.

[0031] Fig.14 The utility model is a schematic diagram of the working state of the braking system when the groove contacts the convex spherical surface and the screw shaft rotates around the ball.

[0032] In the figure:

[0033] 1. Motor assembly; 101. Motor base; 1011. Base groove; 1012. Internal spline interface; 1013. Retaining ring mounting groove; 1014. Base convex spherical surface;

[0034] 2. Ball;

[0035] 3. Transmission mechanism assembly; 301. Ball screw assembly; 3011. Screw shaft; 3012. Screw nut; 30111. Screw groove; 30112. Screw convex spherical surface; 302. Baffle; 303. Retaining ring; 304. Elastic element; 305. Connecting sleeve; 3051. External spline interface;

[0036] 4. Piston assembly; 401. Piston; 402. Sliding bearing;

[0037] 5. Build a pressure cylinder. DETAILED DESCRIPTION

[0038] The specific implementation of the utility model will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0039] like Figures 1 to 14 As shown, the electric control braking system includes a motor assembly 1, a transmission mechanism assembly 3, a piston assembly 4 and a pressure building cylinder 5; the motor assembly and the piston assembly are connected via the transmission mechanism assembly, the piston assembly and the transmission mechanism assembly are located in the pressure building cylinder, the pressure building cylinder and the motor assembly are butt-connected, and the motor assembly and one end of the transmission mechanism assembly are movably connected via a spherical structure or a spherical pair.

[0040] The motor assembly 1 includes a motor base 101, a rotor structure and a stator structure. The transmission mechanism assembly includes a transmission mechanism rotating member, which is a lead screw structure. One end of the transmission mechanism rotating member and the motor base are movably connected via a spherical structure or a spherical pair.

[0041] The motor assembly and the transmission mechanism assembly of the utility model are movably connected via a spherical structure or a spherical pair, and when the coaxiality error between the motor and the booster cylinder is too large after being assembled, the coaxiality between the piston and the booster cylinder can be adjusted during movement, thereby reducing the radial force and movement friction between the piston and the booster cylinder, and reducing the influence of motor vibration on the transmission mechanism, thereby improving transmission efficiency and reducing noise.

[0042] Preferably, Figure 4 and Figure 6 as well as Figure 7 As shown, groove structures are provided on the motor base and one end of the transmission mechanism rotating part, both groove structures are arc-shaped grooves, and the spherical structure is a sphere 2, which is located between the groove of the motor base and the groove at one end of the transmission mechanism rotating part to form a ball docking movable structure.

[0043] Preferably, Figure 5 As shown, a convex spherical surface is provided at one end of the transmission mechanism rotating member, and an arc-shaped groove matching the convex spherical surface is provided on the motor base. The convex spherical surface and the transmission mechanism rotating member are an integrated structure to form a screw convex spherical surface 30112. Or as Figure 8 and Fig. 9 As shown, the motor base 101 is provided with a convex spherical surface, and the end surface of one end of the transmission mechanism rotating member is provided with an arc groove matching the convex spherical surface, and the convex spherical surface and the motor base are an integrated structure. The convex spherical surface integrated structure design is stable and reliable, and is easy to assemble.

[0044] like Figure 3 As shown, the piston assembly 4 includes a piston 401 and a sliding bearing 402. The piston is a hollow cylindrical structure with an opening at one end. The other end of the rotating part of the transmission mechanism is located in the piston. The other end of the piston is a closed end. An annular groove is provided on the outer edge of the other end of the piston. The sliding bearing is installed in the annular groove of the piston and matches the clearance of the pressure building cylinder. When the piston moves forward or backward, the sliding bearing contacts and slides with the inner hole of the pressure building cylinder, which is stable and reliable.

[0045] The convex spherical radius of the spherical structure or the spherical pair is smaller than the arc radius of the groove; specifically: the radius of the ball or the radius of the convex spherical surface formed by the ball and the transmission mechanism rotating part or the radius of the convex spherical surface formed by the ball and the motor base is smaller than the arc radius of the motor base groove or the arc radius of the transmission mechanism rotating part groove.

[0046] like Figure 1 and Figure 2 As shown, an elastic element 304 is provided between the transmission mechanism assembly and the motor assembly for relatively pressing the transmission mechanism rotating part and the motor base. After the elastic element is installed, the elastic force acts on the motor base and the transmission mechanism assembly axially, so that the transmission mechanism assembly, the ball and the motor assembly or the transmission mechanism assembly and the motor assembly maintain a pressed contact, and there is no gap in the axial direction of the motor.

[0047] Preferably, a retaining ring 303 and a connecting sleeve 305 are provided at one end of the transmission mechanism rotating member, the motor base is splined with the connecting sleeve, a retaining ring installation groove 1013 is provided on the motor base to match the outer edge of the retaining ring, and an elastic element is provided between the retaining ring and the connecting sleeve; an annular step is provided at one end of the transmission mechanism rotating member, and a baffle 302 is provided at the annular step corresponding to the retaining ring. The retaining ring is installed in the retaining ring installation groove to axially limit the transmission mechanism rotating member, and the operation is stable and reliable.

[0048] The transmission mechanism assembly has a kinematic interface for transmitting the motor torque to the transmission mechanism assembly, and the kinematic interface is integrated on the transmission mechanism rotating part; the motor assembly has a kinematic interface coupled with the transmission mechanism rotating part, transmitting the motion output by the motor assembly to the motor assembly, and its transmission structure is an existing structure.

[0049] The utility model adds a spherical structure or a spherical pair between the motor assembly and the transmission mechanism assembly; when the coaxiality of the boost cylinder and the motor axis is within a certain error, the transmission mechanism rotating member can be allowed to rotate around the ball at a certain angle to adjust the coaxiality of the piston and the cylinder hole of the boost cylinder, thereby improving the stability of the movement of the piston in the cylinder hole of the boost cylinder; when the coaxiality error of the boost cylinder and the motor assembly axis is relatively large, there is a certain limit to adjusting the coaxiality of the piston and the cylinder hole of the boost cylinder by rotating the transmission mechanism rotating member around the ball at a certain angle. At this time, the radial force borne by the piston acts on the screw shaft, and the transmission mechanism rotating member pushes the ball to roll radially, thereby adjusting the coaxiality of the piston and the cylinder hole of the boost cylinder to a greater extent. When the spherical structure or the spherical pair is added between the motor base and the transmission mechanism assembly, the spherical connection can not only realize the transmission of different axes, but also balance the forces of different axes, so that the piston can work smoothly in the boost cylinder.

[0050] The preferred specific examples of the present utility model are:

[0051] Figure 1 The figure is a cross-sectional view of the structure of the electric control braking system of the present invention; the electric control braking system includes: a motor assembly 1, a ball 2, a transmission mechanism assembly 3, a piston assembly 4 and a pressure-building cylinder 5. The motor assembly 1 includes a motor base 101, and the ball 2 is placed between the motor assembly 1 and the transmission mechanism assembly 3, and the transmission mechanism assembly 3 and the motor assembly 1 are movably connected through the ball 2.

[0052] Figure 2 It is an exploded schematic diagram of the transmission mechanism assembly structure; the transmission mechanism assembly 3 includes a ball screw assembly 301, a baffle 302, a baffle ring 303, an elastic element 304 and a connecting sleeve 305. Figure 4 The figure is a schematic diagram of the structure of a groove-type ball screw assembly; the ball screw assembly 301 includes a screw shaft 3011 and a screw nut 3012, the screw shaft 3011 is a rotating part of the transmission mechanism, the screw nut 3012 is a translational part of the transmission mechanism, and the ball screw assembly 301 converts the rotational motion input by the motor into linear motion. The rotating part of the transmission mechanism is provided with a groove structure, which is reflected in the screw groove 30111; Figure 6 This is a schematic diagram of the structure of a groove-type motor base, in which the motor base 101 is provided with a base groove 1011, and the ball can be placed between the screw groove 30111 and the motor base groove 1011, so that a movable connection is formed between the transmission mechanism assembly 3 and the motor assembly 1 through the ball 2.

[0053] Figure 5It is a schematic diagram of the structure of a ball screw assembly in the form of a convex spherical surface; the ball screw assembly 301 includes a screw shaft 3011 and a screw nut 3012, the screw shaft 3011 is a rotating part of the transmission mechanism, the screw nut 3012 is a translational part of the transmission mechanism, the ball can be integrally formed with the rotating part of the transmission mechanism to form a convex spherical surface, the ball 2 is integrally formed with the screw shaft to form a screw convex spherical surface 30112, and is movably connected to the groove 10111 of the motor base.

[0054] Figure 8 and Fig. 9 It is a schematic diagram of the structure of the motor base in the form of a convex spherical surface; the ball can also be integrally formed with the motor base to form a convex spherical surface 1014 of the base, which is movably connected with the groove 30111 of the rotating part of the transmission mechanism;

[0055] In the form in which the motor assembly and the transmission mechanism assembly are movably connected, the radius of the ball or the radius of the convex spherical surface formed integrally with the ball and the transmission mechanism rotating part or the radius of the convex spherical surface formed integrally with the ball and the motor base is smaller than the arc radius of the groove of the motor base or the arc radius of the groove of the transmission mechanism rotating part.

[0056] like Figures 6 to 9 As shown, the motor base 101 is provided with a retaining ring installation groove 1013. The retaining ring 303 is installed in the retaining ring installation groove 1013; the elastic element 304 is installed between the retaining ring 303 and the connecting sleeve 305. After the elastic element 304 is installed, the elastic force acts on the motor base 101 through the retaining ring 303. After the elastic element is installed, the elastic force is transmitted to the transmission mechanism assembly 3 through the connecting sleeve 305. The elastic force of the retaining ring 303 makes the transmission mechanism assembly, the ball and the motor assembly or the transmission mechanism assembly and the motor assembly maintain a tight contact, and there is no gap in the axial direction of the motor. The retaining ring is installed in the retaining ring installation groove to limit the axial position of the rotating part of the transmission mechanism.

[0057] like Figure 2 The figure shows an exploded schematic diagram of the transmission mechanism assembly structure; the transmission mechanism assembly 3 has a kinematic interface for transmitting the torque of the motor assembly 1 to the transmission mechanism assembly 3, and the kinematic interface here is the external spline interface 3051 on the connecting sleeve 305, and the external spline interface 3051 is integrated with the connecting sleeve 305 on the transmission mechanism rotating part, that is, integrated with the screw shaft 3011.

[0058] like Figures 6 to 9 As shown, the motor assembly 1 has a kinematic interface coupled to the rotating part of the transmission mechanism. The kinematic interface here is an internal spline interface 1012 on the motor base 101. The kinematic interface transmits the motion output by the motor assembly 1 to the transmission mechanism assembly 3.

[0059] like Figure 3The piston assembly includes a piston 401 and a sliding bearing 402. The sliding bearing 402 is installed on the piston 401 and has a clearance fit with the pressure-building cylinder 5. When the piston 401 moves forward or backward, the sliding bearing 402 contacts and slides with the inner hole of the pressure-building cylinder 5.

[0060] Fig.10 This is a schematic diagram of the working state of the brake system when the groove is in contact with the ball and the pressure-building cylinder, the piston and the motor are coaxial. At this time, the pressure-building cylinder 5, the piston 401 and the motor assembly 1 are coaxial, and the motor assembly 1 and the transmission mechanism assembly 3 and the piston assembly 4 transmit smoothly.

[0061] Fig.11 The schematic diagram of the working state of the braking system is that the groove is in contact with the ball and the screw shaft rotates around the ball; at this time, the pressure-building cylinder and the motor are not coaxial, and there is a certain coaxiality error between the pressure-building cylinder and the motor. The radial force borne by the piston and the cylinder hole of the pressure-building cylinder during the coaxial movement will increase, resulting in an increase in the friction between the piston and the cylinder hole of the pressure-building cylinder, which will increase the energy loss during the motion transmission and reduce the transmission efficiency; a spherical structure is added between the transmission output end of the motor assembly and the transmission input end of the ball screw assembly; when the coaxiality of the pressure-building cylinder and the motor axis is within a certain error, the screw shaft can be allowed to rotate around the ball by a certain angle, adjust the coaxiality of the piston and the cylinder hole of the pressure-building cylinder, and improve the smoothness of the piston's movement in the cylinder hole of the pressure-building cylinder.

[0062] Fig.12 The schematic diagram of the working state of the braking system is that the groove is in contact with the ball, and the screw shaft pushes the ball to roll radially; at this time, the coaxiality of the pressure-building cylinder and the motor axis is relatively large, and the piston and the cylinder hole of the pressure-building cylinder are not coaxial. The radial force they bear during movement will increase. When the radial force borne by the piston acts on the ball screw, a torque that causes the ball screw to tilt around a certain point will be generated, which is called the overturning torque. The overturning torque will cause the axis of the nut and the screw shaft to shift, resulting in uneven force on the balls in the ball screw. A few balls are squeezed and subjected to excessive force, which will lead to the crushing of the balls or permanent deformation of the raceway, which will increase the risk of damage and failure of the ball screw; when When the overturning moment is transmitted to the motor bearing through the screw shaft and the bearing seat, the motor bearing is subjected to a relatively large radial force, which may easily lead to damage to the motor bearing. Damage to the motor bearing affects the transmission transmission of the motor and is likely to generate noise. A spherical structure is added between the transmission output end of the motor assembly and the transmission input end of the ball screw assembly. There is a limit to adjusting the coaxiality of the piston and the bore of the pressure-building cylinder by rotating the screw shaft around the ball at a certain angle. At this time, the radial force borne by the piston acts on the screw shaft, and the screw shaft pushes the ball to roll radially, thereby adjusting the coaxiality of the piston and the bore of the pressure-building cylinder to a greater extent, so that the piston can work smoothly in the pressure-building cylinder.

[0063] Fig.13The schematic diagram of the working state of the brake system is that the groove is in contact with the convex spherical surface, and the pressure-building cylinder, piston and motor are coaxial. At this time, the pressure-building cylinder, piston and motor are coaxial, and the motor, transmission mechanism assembly and piston assembly transmit smoothly.

[0064] Fig.14 The schematic diagram of the working state of the braking system is that the groove is in contact with the convex spherical surface and the screw shaft rotates around the ball; at this time, the pressure-building cylinder and the motor are not coaxial, and there is a certain coaxiality error between the pressure-building cylinder and the motor. The radial force borne by the piston and the cylinder hole of the pressure-building cylinder during the coaxial movement will increase, resulting in an increase in the friction force between the piston and the cylinder hole of the pressure-building cylinder during the movement, which will increase the energy loss during the motion transmission process and cause a decrease in the transmission efficiency; a spherical pair structure is added between the motor assembly and the transmission mechanism assembly; when the coaxiality of the pressure-building cylinder and the motor axis is within a certain error, the transmission mechanism rotating part can be allowed to rotate around the spherical pair structure at a certain angle, so as to adjust the coaxiality of the piston and the cylinder hole of the pressure-building cylinder and improve the smoothness of the piston movement in the cylinder hole of the pressure-building cylinder.

[0065] The above is only an explanation of the preferred embodiments of the present invention. The above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0066] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An electric control braking system, comprising a motor assembly, a transmission mechanism assembly, a piston assembly and a pressure-building cylinder, wherein the motor assembly and the piston assembly are connected via the transmission mechanism assembly, and the piston assembly and the transmission mechanism assembly are located in the pressure-building cylinder, characterized in that: The motor assembly and one end of the transmission mechanism assembly are movably connected via a spherical structure or a spherical pair.

2. The electronically controlled braking system according to claim 1, characterized in that: The motor assembly includes a motor base, and the transmission mechanism assembly includes a transmission mechanism rotating member. One end of the transmission mechanism rotating member and the motor base are movably connected via a spherical structure or a spherical pair.

3. The electronically controlled braking system according to claim 2, characterized in that: The motor base and one end of the transmission mechanism rotating member are both provided with a groove structure, and the ball structure is located between the two groove structures.

4. The electronically controlled braking system according to claim 2, characterized in that: A convex spherical surface is arranged at one end of the rotating part of the transmission mechanism, and an arc-shaped groove matching with the convex spherical surface is arranged on the motor base.

5. The electronically controlled braking system according to claim 2, characterized in that: The motor base is provided with a convex spherical surface, and the end surface of one end of the rotating part of the transmission mechanism is provided with an arc-shaped groove matched with the convex spherical surface.

6. The electronically controlled braking system according to claim 2, characterized in that: An elastic element for relatively pressing the transmission mechanism rotating part and the motor base is arranged between the transmission mechanism assembly and the motor assembly.

7. The electronically controlled braking system according to claim 2, characterized in that: The piston assembly comprises a piston and a sliding bearing. The other end of the rotating part of the transmission mechanism is located in the piston. The sliding bearing is arranged on the piston and is clearance-matched with the pressure-building cylinder.

8. The electronically controlled braking system according to any one of claims 3 to 5, characterized in that: The convex spherical radius of the spherical structure or the spherical surface pair is smaller than the arc radius of the groove.

9. The electronically controlled braking system according to claim 6, characterized in that: A retaining ring and a connecting sleeve are arranged at one end of the transmission mechanism rotating member, the motor base is spline-matched with the connecting sleeve, a retaining ring mounting groove matching with the outer edge of the retaining ring is arranged on the motor base, and the elastic element is arranged between the retaining ring and the connecting sleeve.

10. The electronically controlled braking system according to claim 9, characterized in that: An annular step is provided at one end of the rotating member of the transmission mechanism, and a baffle is provided at the annular step corresponding to the baffle ring.

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