EMB caliper retraction limit strategy, EMB calipers and vehicles

Abstract

This invention discloses a retraction limit strategy for an EMB caliper, an EMB caliper, and a vehicle. The retraction limit strategy for the EMB caliper includes: Step S1, controlling the motor to reverse at a target speed, and monitoring the motor current and the motor rotation angle; Step S2, determining whether the motor current and the motor rotation angle simultaneously reach the corresponding target range. If the motor current and the motor rotation angle simultaneously reach the corresponding target range, then proceed to Step S3; if the motor current and the motor rotation angle do not simultaneously reach the corresponding target range, then proceed to Step S4; Step S3, completing the retraction; Step S4, triggering an alarm for an abnormality. According to the retraction limit strategy of the EMB caliper of this invention, by controlling the reverse speed of the motor and monitoring the stall current and the reverse angle of the motor during reverse rotation, excessive pressure is avoided between the lead screw and the piston cylinder, preventing jamming. This eliminates the need for limit pins and stop blocks.

Description

Technical Field

[0001] This invention relates to the field of vehicle manufacturing technology, and in particular to a retraction limit strategy for an EMB caliper, an EMB caliper, and a vehicle. Background Technology

[0002] The relevant technology indicates that EMB calipers currently mainly consist of a motor module, a parking mechanism, a reduction mechanism, and a transmission mechanism. During service braking, the motor outputs power, which is reduced and amplified by the reduction mechanism before being transmitted to the motion conversion mechanism. The motion conversion mechanism converts the rotary motion into linear motion via a ball screw, pushing the piston cylinder. The piston cylinder then pushes the friction pads to tighten the brake disc, completing the braking process. When the brake is released, the motor reverses direction, and based on the same principle, the piston performs a reverse linear motion, completing the brake release.

[0003] In special operating conditions, such as when replacing friction plates, a significant piston retraction is required to facilitate replacement and installation. In such cases, it's crucial to monitor the positions of the piston and lead screw to prevent direct contact between the lead screw end face and the inner surface of the piston cylinder (or to avoid excessive pressure between them). Otherwise, the friction between them could lead screw and piston cylinder jamming. Current designs incorporate a limiting pin in the lead screw and a stop block on the inner surface of the piston cylinder. These two components work together to limit piston retraction, preventing piston and lead screw jamming. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a retraction limiting strategy for EMB calipers, which can prevent jamming between the leadscrew and the piston cylinder.

[0005] The present invention also proposes an EMB caliper suitable for the application of the above-mentioned EMB caliper retraction limit strategy.

[0006] The present invention also proposes a vehicle having the above-mentioned EMB caliper.

[0007] According to the first aspect of the present invention, the retraction limit strategy of the EMB caliper includes: step S1, controlling the motor to reverse at a target speed and monitoring the motor current and the motor rotation angle; step S2, determining whether the motor current and the motor rotation angle simultaneously reach the corresponding target range; if the motor current and the motor rotation angle simultaneously reach the corresponding target range, then step S3 is executed; if the motor current and the motor rotation angle do not simultaneously reach the corresponding target range, then step S4 is executed; step S3, completing the retraction; step S4, alarming for abnormality.

[0008] According to the retraction limit strategy of the EMB caliper of the present invention, by controlling the reverse speed of the motor, monitoring the stall current and the reverse angle of the motor during reverse rotation, and controlling the contact between the lead screw end face and the inner surface of the piston cylinder to achieve physical stop, the large pressure between the lead screw and the piston cylinder is avoided, which could cause jamming. There is no need to set limit pins and stop blocks.

[0009] In some embodiments, before step S1, the method further includes step S0: turning on the motor.

[0010] According to the second aspect of the present invention, an EMB caliper is suitable for application in the retraction limit strategy of the EMB caliper of the first aspect of the present invention. The EMB caliper includes: a motion conversion mechanism and a motor, the motion conversion mechanism being connected to the motor. The motion conversion mechanism includes: a piston cylinder having a receiving cavity formed therein, and a first stop surface formed therein; a drive shaft disposed within the receiving cavity; and a lead screw sleeved on the outside of the drive shaft and connected to the drive shaft, one end of the lead screw having a second stop surface formed therein, the lead screw being stopped relative to the piston cylinder through the cooperation of the first stop surface and the second stop surface.

[0011] The EMB caliper of the present invention simplifies the structural design of the EMB caliper and reduces production costs by eliminating the additional physical limiting design of the limiting pin and the stop block. Furthermore, by applying the retraction limiting strategy of the first aspect embodiment of the present invention to the EMB caliper of the present invention embodiment, the high efficiency, accuracy and reliability of the braking process are ensured.

[0012] In some embodiments, the first stop surface extends along a direction perpendicular to the axis of the piston cylinder, and the second stop surface extends along a direction perpendicular to the axis of the lead screw, wherein the shapes of the first stop surface and the second stop surface are adapted to each other.

[0013] In some embodiments, the first stop surface is formed on the bottom wall of the receiving cavity, one end of the lead screw is formed with a stop segment, and the second stop surface is formed on the end face of the stop segment facing the bottom wall of the receiving cavity.

[0014] In some embodiments, the EMB caliper further includes: a reduction mechanism and a friction plate, the motion conversion mechanism is disposed between the reduction mechanism and the friction plate, the motor is connected to the reduction mechanism, one end of the drive shaft forms a first mating surface, the other end of the drive shaft is connected to the reduction mechanism, and a second mating surface is formed inside the lead screw, the shape of the second mating surface being adapted to the shape of the first mating surface.

[0015] In some embodiments, the first mating surface extends obliquely in the axial direction of the drive shaft, and the first mating surface is formed as an arc-shaped surface extending outward along the radial direction of the drive shaft. The second mating surface extends obliquely in the axial direction of the lead screw, and the second mating surface extends outward along the radial direction of the lead screw. The first mating surface and the second mating surface are in contact.

[0016] In some embodiments, a mating section is formed at one end of the drive shaft, a first mating surface is formed on the mating section and extends circumferentially along the mating section, a mating platform is formed inside the lead screw, a mating groove is formed on the side surface of the mating platform facing the drive shaft, the mating section is disposed in the mating groove, and a second mating surface is formed on the surface of the mating groove.

[0017] In some embodiments, the motion conversion mechanism further includes: a nut and a ball bearing, the nut being fixedly connected to the piston cylinder, the nut being sleeved on the lead screw and rotatable relative to the lead screw, and the ball bearing being disposed between the lead screw and the nut; and / or, the EMB caliper further includes: a parking mechanism, the parking mechanism being located between the reduction mechanism and the motor, the parking mechanism having a connecting shaft, the connecting shaft having meshing teeth, the drive shaft of the motor being connected to one end of the connecting shaft, and the other end of the connecting shaft being meshed with the reduction mechanism through the meshing teeth.

[0018] The vehicle according to the third aspect of the invention includes the EMB caliper according to the second aspect of the invention described above.

[0019] According to the present invention, by providing the EMB caliper described in the second aspect above, the braking performance of the vehicle is improved, thereby ensuring the safety and reliability of the vehicle.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 This is a flowchart of the retraction limit strategy of an EMB caliper according to a first aspect embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of an EMB caliper according to a second aspect embodiment of the present invention;

[0023] Figure 3 yes Figure 2 A schematic diagram of the motion conversion mechanism shown.

[0024] Figure label:

[0025] 100. EMB caliper; 1. Reduction mechanism; 2. Friction plate; 3. Motion conversion mechanism; 31. Piston cylinder; 311. First stop surface; 32. Drive shaft; 321. First mating surface; 322. Boss; 33. Lead screw; 331. Second mating surface; 332. Mating platform; 3321. Connecting hole; 333. Second stop surface; 34. Connecting section; 38. Nut; 39. Ball bearing; 4. Parking mechanism; 5. Motor. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following is for reference. Figure 1 A retraction limiting strategy for an EMB caliper according to an embodiment of the first aspect of the present invention is described.

[0028] like Figure 1 As shown, the retraction limiting strategy of the EMB caliper according to the first aspect of the present invention includes:

[0029] Step S0: Turn on the motor;

[0030] Step S1: Control the motor to reverse at the target speed, and monitor the motor current and the motor rotation angle;

[0031] Step S2: Determine whether the motor current and the motor rotation angle reach the corresponding target range simultaneously. If the motor current and the motor rotation angle reach the corresponding target range simultaneously, proceed to step S3. If the motor current and the motor rotation angle do not reach the corresponding target range simultaneously, proceed to step S4.

[0032] Step S3: Complete the rollback;

[0033] Step S4: Alarm error.

[0034] Understandably, the motor is controlled to reverse at a low speed (target speed), and the motor current and rotation angle are continuously monitored. The motor current reflects the load condition, and the rotation angle reflects the distance the piston moves. If the current and rotation angle reach the corresponding target range at the same time, it means that the brake has been correctly reset and the next step can be executed. If either parameter does not reach the target range, it indicates that there may be an abnormality and further processing is required.

[0035] According to the retraction limit strategy of the EMB caliper of the present invention, by controlling the reverse speed of the motor, monitoring the stall current and the reverse angle of the motor during reverse rotation, and controlling the contact between the end face of the lead screw 33 and the inner surface of the piston cylinder 31 to achieve physical stop, the large pressure between the lead screw 33 and the piston cylinder 31 is avoided, which may cause jamming. There is no need to set limit pins and stop blocks.

[0036] The following is for reference. Figures 2-3 An EMB caliper 100 according to a second aspect of the present invention is described.

[0037] like Figures 2-3 As shown, the EMB caliper 100 according to the second aspect embodiment of the present invention is suitable for the application of the retraction limit strategy of the EMB caliper 100 according to the first aspect embodiment of the present invention. The EMB caliper 100 includes: a motion conversion mechanism 3 and a motor 5.

[0038] Specifically, the motion conversion mechanism 3 is connected to the motor 5. The motion conversion mechanism 3 includes: a piston cylinder 31, in which a receiving cavity is formed, and a first stop surface 311 is formed in the receiving cavity; a transmission shaft 32, which is disposed in the receiving cavity; and a lead screw 33, which is sleeved on the outside of the transmission shaft 32 and connected to the transmission shaft 32. One end of the lead screw 33 has a second stop surface 333, and the lead screw 33 is stopped relative to the piston cylinder 31 through the cooperation of the first stop surface 311 and the second stop surface 333.

[0039] Understandably, an EMB (Electromechanical Brake) caliper is an advanced braking system component that uses electromechanical technology to achieve vehicle braking. Unlike traditional hydraulic braking systems, the EMB system uses a motor 5 to drive a mechanical structure to press the friction pads 2 together to generate braking force. This system offers more precise control and faster response, while reducing maintenance requirements. The reduction mechanism 1 converts the high-speed, low-torque output of the motor 5 into the low-speed, high-torque required for braking. This effectively utilizes the force provided by the motor 5 to apply sufficient pressure to the brake disc. The friction pads 2 contact the wheel to slow its rotation. When the friction pads 2 are pressed against the brake disc, friction is generated, reducing the wheel's rotational speed until it stops. The motion conversion mechanism 3, located between the reduction mechanism 1 and the friction pads 2, converts the linear or rotational motion generated by the reduction mechanism 1 into pressure that pushes the friction pads 2 towards the brake disc.

[0040] In other words, the piston cylinder 31 has a first stop surface 311, and one end of the lead screw 33 has a second stop surface 333. The shape of the first stop surface 311 matches the shape of the second stop surface 333. The first stop surface 311 and the second stop surface 333 ensure that the lead screw 33 will not move excessively, thus avoiding system failure caused by excessive displacement.

[0041] The EMB caliper 100 according to an embodiment of the present invention simplifies the structural design of the EMB caliper 100 and reduces production costs by eliminating the additional physical limiting design of the limiting pin and the stop block. Furthermore, by applying the retraction limiting strategy of the first aspect embodiment of the present invention to the EMB caliper 100 of the present invention, the high efficiency, accuracy and reliability of the braking process are ensured.

[0042] In some embodiments of the present invention, the first stop surface 311 extends along a direction perpendicular to the axis of the piston cylinder 31, and the second stop surface 333 extends along a direction perpendicular to the axis of the lead screw 33. The shapes of the first stop surface 311 and the second stop surface 333 are adapted to each other. It is understood that when the lead screw 33 rotates to a certain angle, the second stop surface 333 will contact the first stop surface 311, preventing the lead screw 33 from continuing to move, ensuring that the lead screw 33 will not exceed the predetermined stroke range, thereby protecting the system from overload damage.

[0043] Furthermore, a first stop surface 311 is formed on the bottom wall of the receiving cavity, a stop segment is formed at one end of the lead screw 33, and a second stop surface 333 is formed on the end face of the stop segment facing the bottom wall of the receiving cavity. When the lead screw 33 rotates to a certain angle, the second stop surface 333 on the stop segment will contact the first stop surface 311 on the bottom wall of the receiving cavity, preventing the lead screw 33 from continuing to move. The shape adaptation design of the stop surface allows the lead screw 33 to stop smoothly when it contacts the stop surface, reducing the instability factors of the system under extreme conditions.

[0044] In some embodiments of the present invention, such as Figure 2 As shown, the EMB caliper 100 also includes: a reduction mechanism 1 and a friction plate 2; a motion conversion mechanism 3 is disposed between the reduction mechanism 1 and the friction plate 2; a motor 5 is connected to the reduction mechanism 1; one end of the transmission shaft 32 forms a first mating surface 321; the other end of the transmission shaft 32 is connected to the reduction mechanism 1; a second mating surface 331 is formed inside the lead screw 33; the shape of the second mating surface 331 is adapted to the shape of the first mating surface 321. Specifically, the first mating surface 321 extends obliquely in the axial direction of the transmission shaft 32, and the first mating surface 321 is formed as an arc-shaped surface extending outward along the radial direction of the transmission shaft 32; the second mating surface 331 extends obliquely in the axial direction of the lead screw 33, and the second mating surface 331 extends outward along the radial direction of the lead screw 33; the first mating surface 321 and the second mating surface 331 are in contact.

[0045] In other words, one end of the drive shaft 32 has an arc-shaped first mating surface 321, and the other end is connected to the reduction mechanism 1. The lead screw 33 has an arc-shaped second mating surface 331. The shape of the first mating surface 321 matches the shape of the second mating surface 331. When the lead screw 33 is misaligned due to assembly errors or gaps between it and the ball 39, the arc-shaped mating surface between the drive shaft 32 and the lead screw 33 can automatically adjust within a certain range to maintain the vertical state of the drive shaft 32. This ensures that the direction of the force received by the pressure sensor is always perpendicular to the piston cylinder 31, thereby making the pressure sensor value more accurate.

[0046] In this way, through the arc-shaped surface cooperation between the drive shaft 32 and the lead screw 33, the state of the drive shaft 32 can be automatically adjusted and maintained within a certain range, so that the force received by the pressure sensor is perpendicular to the piston cylinder 31, thereby making the data measured by the pressure sensor more accurate and ensuring the accuracy of vehicle condition monitoring.

[0047] like Figure 3 As shown, the first mating surface 321 extends obliquely in the vertical direction and extends outward along an arc protruding in the radial direction of the drive shaft 32. The second mating surface 331 extends obliquely in the vertical direction and extends outward along an arc protruding in the radial direction of the lead screw 33. Therefore, the mating method of the first mating surface 321 and the second mating surface 331 is simple. The arc-shaped surface is less likely to disperse pressure than a flat surface, which helps to reduce premature wear caused by large local stress, ensuring that the EMB caliper 100 can operate efficiently and reliably, while also improving the braking performance of the EMB caliper 100.

[0048] In some embodiments of the present invention, the first mating surface 321 extends obliquely in the axial direction of the drive shaft 32, and the first mating surface 321 extends in an outwardly protruding arc along the radial direction of the drive shaft 32. The second mating surface 331 extends obliquely in the axial direction of the lead screw 33, and the second mating surface 331 extends in an outwardly protruding arc along the radial direction of the lead screw 33. The first mating surface 321 and the second mating surface 331 are in contact. That is, the first mating surface 321 and the second mating surface 331 ensure that the drive shaft 32 and the lead screw 33 can effectively transmit force and maintain good contact during operation. As shown in the figure, the first mating surface 321 extends obliquely in the vertical direction and extends in an outwardly protruding arc along the radial direction of the drive shaft 32. The second mating surface 331 extends obliquely in the vertical direction and extends in an outwardly protruding arc along the radial direction of the lead screw 33. Therefore, the mating method of the first mating surface 321 and the second mating surface 331 is simple. The arc-shaped surface is more difficult to disperse pressure than the flat surface, which helps to reduce the occurrence of premature wear caused by large local stress, ensuring that the EMB caliper 100 can operate efficiently and reliably, and at the same time improving the braking performance of the EMB caliper 100.

[0049] In some embodiments of the present invention, a mating section is formed at one end of the drive shaft 32, a first mating surface 321 is formed on the mating section and extends circumferentially along the mating section, a mating platform 332 is formed inside the lead screw 33, a mating groove is formed on the side surface of the mating platform 332 facing the drive shaft 32, the mating section is disposed in the mating groove, and a second mating surface 331 is formed on the surface of the mating groove. It is understood that the mating groove is used to accommodate the mating section of the drive shaft 32. When the mating section is placed in the mating groove, the first mating surface 321 and the second mating surface 331 are tightly fitted together. Therefore, the structural design of the drive shaft 32 is reasonable, improving the fit between the drive shaft 32 and the lead screw 33.

[0050] In some embodiments of the present invention, one end of the drive shaft 32 is connected to a connecting section 34, and a mating platform 332 forms a connecting hole 3321. The connecting hole 3321 is formed in the bottom wall of the mating groove, and the connecting section 34 is disposed within the connecting hole 3321. Furthermore, a spline is formed on the peripheral wall of the connecting section 34, and the drive shaft 32 and the lead screw 33 are connected by the spline. Thus, the spline provides a larger contact area, which can effectively transmit higher torque. The spline structure helps maintain good alignment between the drive shaft 32 and the lead screw 33, reducing additional stress and wear caused by misalignment. The spline provides a stable connection, is easy to disassemble and assemble, facilitates maintenance and component replacement, and can withstand greater torsional forces, ensuring that the connection will not fail due to excessive torque during braking. The spline connection also helps reduce minor movements between the drive shaft 32 and the lead screw 33, thereby reducing vibration and noise.

[0051] In some embodiments of the present invention, a boss 322 is formed on the drive shaft 32. The boss 322 is formed on the side of the mating section away from the connecting section 34 and is arranged adjacent to the mating section. A pressure sensor is provided on the drive shaft 32. A gasket is provided between the pressure sensor and the boss 322, and a bearing is provided between the gasket and the boss 322. It can be understood that the boss 322 is used to support the pressure sensor and provide a mounting position for the pressure sensor. The gasket reduces wear and provides the necessary clearance or preload between different components. The bearing reduces the relative friction between components and ensures that the drive shaft 32 can rotate smoothly.

[0052] In some embodiments of the present invention, the motion conversion mechanism 3 further includes a nut 38 and a ball bearing 39. The nut 38 is fixedly connected to the piston cylinder 31 and is sleeved on the lead screw 33, and can rotate relative to the lead screw 33. The ball bearing 39 is disposed between the lead screw 33 and the nut 38. It is understood that the nut 38 is fixedly connected to the piston cylinder 31 and sleeved on the lead screw 33. The nut 38 has a spiral groove inside, which matches the spiral protrusion on the lead screw 33. The ball bearing 39 disposed between the nut 38 and the lead screw 33 reduces friction, improves mechanical efficiency, increases the durability and precision of the EMB caliper 100, reduces wear, and extends service life.

[0053] In some embodiments of the present invention, the reduction mechanism 1 has an output shaft, and the other end of the transmission shaft 32 is connected to the output shaft. This ensures that the force transmission path from the reduction mechanism 1 to the transmission shaft 32 and then to the lead screw 33 and piston cylinder 31 is continuous and efficient, thereby ensuring the efficiency, accuracy and reliability of the entire braking process.

[0054] In some embodiments of the present invention, the EMB caliper 100 further includes a parking mechanism 4, which is located between the reduction mechanism 1 and the motor 5. The parking mechanism 4 has a connecting shaft with meshing teeth formed on it. The drive shaft of the motor 5 is connected to one end of the connecting shaft, and the other end of the connecting shaft is connected to the reduction mechanism 1 through the meshing teeth. It is understood that the parking mechanism 4, located between the reduction mechanism 1 and the motor 5, provides additional braking force when the vehicle is parked, ensuring that the vehicle does not move when stationary.

[0055] A vehicle according to a third aspect of the present invention includes an EMB caliper 100 according to the second aspect of the present invention described above.

[0056] According to the embodiments of the present invention, by providing the EMB caliper 100 of the second aspect embodiment described above, the braking performance of the vehicle is improved, thereby ensuring the safety and reliability of the vehicle.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A retraction limit strategy for an EMB caliper, characterized in that, include: Step S1: Control the motor to reverse at the target speed, and monitor the motor current and the motor rotation angle; Step S2: Determine whether the motor current and the motor rotation angle simultaneously reach the corresponding target range. If the motor current and the motor rotation angle simultaneously reach the corresponding target range, proceed to step S3. If the motor current and the motor rotation angle do not simultaneously reach the corresponding target range, proceed to step S4. In this process, the motor current and the motor rotation angle are continuously monitored. The motor current reflects the load condition, and the rotation angle reflects the distance the piston moves. If the current and the rotation angle simultaneously reach the corresponding target range, it indicates that the brake has been correctly reset. By controlling the reverse speed of the motor, monitoring the stall current and the reverse angle of the motor during reverse rotation, the second stop surface of the lead screw is controlled to contact the first stop surface of the piston cylinder to achieve physical stop while avoiding excessive pressure between the lead screw and the piston cylinder, which could cause jamming. Step S3: Complete the rollback; Step S4: Alarm error.

2. The retraction limiting strategy of the EMB caliper according to claim 1, characterized in that, Before step S1, the procedure also includes step S0: starting the motor.

3. An EMB caliper, characterized in that, Suitable for the retraction limit strategy application of the EMB caliper according to any one of claims 1-2, the EMB caliper includes: a motion conversion mechanism and a motor, the motion conversion mechanism being connected to the motor, the motion conversion mechanism including: A piston cylinder, wherein a receiving cavity is formed inside the piston cylinder, and a first stop surface is formed inside the receiving cavity; A drive shaft is disposed within the receiving cavity; A lead screw is sleeved on the outside of the drive shaft and connected to the drive shaft. One end of the lead screw has a second stop surface. The lead screw stops relative to the piston cylinder through the cooperation of the first stop surface and the second stop surface.

4. The EMB caliper according to claim 3, characterized in that, The first stop surface extends along a direction perpendicular to the axis of the piston cylinder, and the second stop surface extends along a direction perpendicular to the axis of the lead screw. The shapes of the first stop surface and the second stop surface are adapted to each other.

5. The EMB caliper according to claim 4, characterized in that, The first stop surface is formed on the bottom wall of the receiving cavity, one end of the lead screw is formed with a stop segment, and the second stop surface is formed on the end face of the stop segment facing the bottom wall of the receiving cavity.

6. The EMB caliper according to claim 5, characterized in that, Also includes: The system includes a speed reduction mechanism and a friction plate. The motion conversion mechanism is located between the speed reduction mechanism and the friction plate. The motor is connected to the speed reduction mechanism. One end of the transmission shaft has a first mating surface, and the other end of the transmission shaft is connected to the speed reduction mechanism. A second mating surface is formed inside the lead screw, and the shape of the second mating surface is adapted to the shape of the first mating surface.

7. The EMB caliper according to claim 6, characterized in that, The first mating surface extends obliquely in the axial direction of the drive shaft, and the first mating surface is formed as an arc-shaped surface extending outward along the radial direction of the drive shaft. The second mating surface extends obliquely in the axial direction of the lead screw, and the second mating surface extends outward along the radial direction of the lead screw. The first mating surface and the second mating surface are in contact.

8. The EMB caliper according to claim 7, characterized in that, One end of the drive shaft has a mating section, a first mating surface is formed on the mating section and extends circumferentially along the mating section, a mating platform is formed inside the lead screw, a mating groove is formed on the side surface of the mating platform facing the drive shaft, the mating section is disposed in the mating groove, and a second mating surface is formed on the surface of the mating groove.

9. The EMB caliper according to any one of claims 4-8, characterized in that, The motion conversion mechanism further includes: a nut and a ball bearing, the nut being fixedly connected to the piston cylinder, the nut being sleeved on the lead screw and rotatable relative to the lead screw, and the ball bearing being disposed between the lead screw and the nut; and / or, the EMB caliper further includes: a parking mechanism, the parking mechanism being located between the reduction mechanism and the motor, the parking mechanism having a connecting shaft, the connecting shaft having meshing teeth, the drive shaft of the motor being connected to one end of the connecting shaft, and the other end of the connecting shaft being meshed with the reduction mechanism through the meshing teeth.

10. A vehicle, characterized in that, Includes the EMB caliper as described in any one of claims 3-9.

Images