Electromagnet and EMB parking structure

Abstract

This utility model belongs to the field of braking technology and discloses an electromagnet used in an EMB parking structure. The EMB parking structure includes a motor, a ratchet, and a pawl. The electromagnet includes a frame, a static magnetic component, a moving magnetic core, and an elastic element. The static magnetic component is located in the frame, and the moving magnetic core passes through the frame and is connected to the pawl. The static magnetic component generates a force F1 that drives the moving magnetic core to move. F1 changes as the moving magnetic core moves. The elastic element generates a force F2 that drives the first end of the moving magnetic core to extend outward. When not parked, the moving magnetic core is in the initial position. When parking is required, the moving magnetic core extends from the initial position through the first position to the parking position, driving the pawl to move and engage in the groove between two adjacent ratchet teeth of the ratchet. When the electromagnet is not energized and the moving magnetic core is in the first position, F1=F2. The travel length of the moving magnetic core from the parking position to the first position is greater than the height of the ratchet teeth. The electromagnet does not need to be energized again to cooperate with the motor to achieve the anti-rollover function.

Description

Technical Field

[0001] This utility model relates to the field of braking technology, and in particular to an electromagnet and an EMB parking structure. Background Technology

[0002] Electro-Mechanical Braking (EMB) is a braking system that uses electrical and mechanical components to slow down or stop a vehicle. It applies braking force using an electric motor or actuator, effectively replacing the traditional hydraulic drive method. This results in more precise control, significantly improved braking performance, a reduction in hydraulic components, more stable operation, and easier maintenance.

[0003] Most existing EMB parking mechanisms are implemented using an electromagnet-driven ratchet and pawl structure. Specifically, the electromagnet is either bistable or monostable. However, given the nature of steady-state electromagnets and the additional functions of parking, such as re-clamping at high temperatures or re-clamping after the vehicle has rolled away, the electromagnet needs to be switched on and off repeatedly to achieve these functions. If the electromagnet's holding force is insufficient during the power-off process, the electromagnet may fail, potentially leading to the risk of the vehicle rolling away. Utility Model Content

[0004] The purpose of this invention is to provide an electromagnet that effectively increases the holding force of the electromagnet within a certain stroke after power is cut off. The electromagnet can work with a motor to achieve the anti-rollover function without the need for re-energizing, and the performance is reliable and stable.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electromagnet is used in an EMB parking structure, the EMB parking structure including a motor, a ratchet connected to the motor, and a pawl cooperating with the ratchet; the electromagnet includes a frame, a static magnetic assembly, a moving magnetic core, and an elastic element; wherein...

[0007] The static magnetic component is disposed within the frame, the moving magnetic core is disposed through the frame, the first end of the moving magnetic core is connected to the pawl, the elastic element abuts between the frame and the moving magnetic core, the static magnetic component is used to generate a force F1 that drives the moving magnetic core to move, F1 changes as the moving magnetic core moves, and the elastic element is used to generate a force F2 that drives the first end of the moving magnetic core to extend outward.

[0008] When the vehicle is not parked, the moving magnetic core is in its initial position;

[0009] When parking is required, the electromagnet is powered in the positive direction, causing the moving magnetic core to extend from the initial position and pass through the first position to the parking position, which in turn moves the pawl and engages with the groove between the two ratchet teeth of the ratchet. When the electromagnet is not powered and the moving magnetic core is in the first position, F1=F2, and the travel length S1 of the moving magnetic core from the parking position to the first position is greater than the height H of the ratchet teeth of the ratchet.

[0010] Preferably, when the moving magnetic core is in the parking position, the motor continues to rotate, which can drive the ratchet to rotate relative to the pawl, so that the pawl moves out of the current tooth groove and engages in the next adjacent tooth groove, and the stroke length of the moving magnetic core corresponding to the current tooth groove is less than or equal to the stroke length S1 of the moving magnetic core between the first position and the parking position.

[0011] Preferably, when the electromagnet is not energized, the position where the magnetic force on the moving magnetic core is 0 from the static magnetic component is the second position. The rotation of the motor drives the ratchet to rotate relative to the pawl until the pawl moves out of the position of the moving magnetic core corresponding to the current tooth groove, which is the third position. The travel length between the second position and the parking position is S2, and the travel length between the third position and the parking position is S3; then S2 < S3 < S1.

[0012] Preferably, the static magnetic assembly includes a coil wound on the frame; wherein,

[0013] When the coil is energized in the positive direction, it can drive the moving magnetic core to move from the initial position to the parking position; when the coil is energized in the negative direction, it can drive the moving magnetic core to move from the parking position to the initial position.

[0014] Preferably, the static magnetic assembly includes a first static magnetic core, a second static magnetic core, and a magnetic component; wherein,

[0015] The first stationary magnetic core, the second stationary magnetic core, and the magnetic component can all generate magnetic force on the moving magnetic core. When the moving magnetic core is in the parking position, the first stationary magnetic core and the moving magnetic core are attracted to each other. When the moving magnetic core is in the initial position, the second stationary magnetic core and the moving magnetic core are attracted to each other.

[0016] Preferably, the frame has a through hole extending from its first end to its second end, the first static magnetic core is disposed at the first end of the through hole, the second static magnetic core is disposed at the second end of the through hole, the first end of the moving magnetic core passes through the first static magnetic core, and the second end of the moving magnetic core passes through the second static magnetic core.

[0017] Preferably, the moving magnetic core includes a first core, a second core, and a third core arranged sequentially. The diameter of the second core is larger than the diameters of the first core and the third core. The first static magnetic core has a first hole, and the second static magnetic core has a second hole. The first core is slidably inserted through the first hole, the second core is slidably inserted into the through hole, and the third core is slidably inserted through the second hole. The distance between the first static magnetic core and the second static magnetic core is greater than the length of the second core.

[0018] Preferably, the first end of the moving magnetic core is provided with a connector, the connector is provided with a first hinge shaft, the pawl is provided with a first hinge hole, the first hinge hole is set as an elongated hole, the first hinge shaft can be hinged with the first hinge hole and can move along the length direction of the first hinge hole.

[0019] Preferably, the elastic element is configured as a spring, which is sleeved on the moving magnetic core and the connector.

[0020] Preferably, the first end of the frame is provided with a first baffle, the connector is provided with a second baffle, the first end of the spring abuts against the first baffle, and the second end abuts against the second baffle.

[0021] Beneficial effects:

[0022] The electromagnet provided by this utility model has a static magnetic component that generates a force F1 to drive the moving magnetic core. The value of F1 changes with the movement of the moving magnetic core. An elastic element generates a force F2 to drive the first end of the moving magnetic core to extend outward. When the electromagnet is not energized, the resultant force of F1 and F2 is the resultant force on the moving magnetic core. When the vehicle is not parked, the moving magnetic core is in the initial position, at which time the pawl is separated from the ratchet, and the vehicle is in the parking released state. When parking is required, the electromagnet is positively energized, driving the moving magnetic core to extend outward from the initial position and through the first position to the parking position, causing the pawl to move and engage with the groove between the two ratchet teeth of the ratchet. At this time, the pawl and the ratchet are engaged, and the vehicle is in the parking state. After parking is completed and the electromagnet is de-energized for a period of time, the clamping force at the wheel end will gradually decrease due to the continuous decrease in temperature of components such as the wheel end friction plate and the clamp body assembly. When the wheel end clamping force drops to a certain value, the vehicle may roll away. To prevent slippage, after a period of parking, the motor can be activated according to the program to increase the clamping force. During this process, the electromagnet is not energized, ensuring that the pawl and ratchet do not disengage. When the moving magnetic core moves from the parking position to the first position, F1=F2, and the travel length S1 of the moving magnetic core from the parking position to the first position is set to be greater than the ratchet tooth height H. Even if the moving magnetic core moves a travel length H from the parking position, i.e., moves the height of one ratchet tooth, the resultant force of the moving magnetic core is always greater than 0. Thus, the elastic element can continuously provide a positive holding force. The electromagnet does not need to be energized again to work with the motor to achieve the anti-slippage function, improving the adverse effect of accidental failure of the electromagnet due to power failure, and ensuring reliable and stable use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the electromagnet provided by this utility model;

[0024] Figure 2 This is an explosion diagram of the electromagnet provided by this utility model;

[0025] Figure 3 This is a cross-sectional schematic diagram of the electromagnet's moving magnetic core without its extension provided by this utility model;

[0026] Figure 4 This is a cross-sectional schematic diagram of the extended moving magnetic core of the electromagnet provided by this utility model;

[0027] Figure 5 This is a schematic diagram of the internal structure of the EMB parking structure provided by this utility model;

[0028] Figure 6 This is a schematic diagram of the main components of the EMB parking structure provided by this utility model;

[0029] Figure 7 This is an exploded view of the main components of the EMB parking structure provided by this utility model;

[0030] Figure 8 This is a cross-sectional schematic diagram of the main components of the EMB parking structure provided by this utility model;

[0031] Figure 9 This is a schematic diagram of the main components of the EMB parking structure provided by this utility model when the vehicle is not parked.

[0032] Figure 10 This is a schematic diagram of the main components of the EMB parking structure provided by this utility model when parked;

[0033] Figure 11 This utility model is based on Figure 10 Enlarged view of part A in the middle

[0034] Figure 12 This is a schematic diagram of the main components of the EMB parking structure provided by this utility model during the high temperature or slippage and re-clamping process when parking;

[0035] Figure 13 This is a schematic diagram showing the change in force value on the moving magnetic core of the electromagnet as it travels, provided by this utility model.

[0036] In the picture:

[0037] 1. Frame; 11. Through hole; 12. First baffle; 13. Slot;

[0038] 21. First static magnetic core; 211. First hole; 22. Second static magnetic core; 221. Second hole; 23. Magnetic component; 24. Coil;

[0039] 3. Moving magnetic core; 31. First core; 32. Second core; 33. Third core; 34. Connector; 341. Second baffle; 35. First hinge shaft;

[0040] 4. Elastic components;

[0041] 5. Outer casing; 51. First gear; 52. Second gear; 53. Third gear;

[0042] 6. Motor; 61. Second hinge shaft;

[0043] 7. Ratchet;

[0044] 8. Pawl; 81. First hinge hole; 82. Second hinge hole. Detailed Implementation

[0045] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0046] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 utility model and for 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] This utility model provides an EMB parking structure. (Refer to...) Figures 1 to 13 As shown, the EMB parking mechanism includes a motor 6, a ratchet 7 connected to the motor 6, and a pawl 8 that engages with the ratchet 7. The EMB parking mechanism also includes a housing 5 and a clamp assembly (not shown), with the motor 6, ratchet 7, and pawl 8 all housed within the housing 5.

[0050] This utility model also provides an electromagnet for the above-mentioned EMB parking structure. The electromagnet includes a frame 1, a static magnetic component, a moving magnetic core 3, and an elastic element 4. The static magnetic component is disposed inside the frame 1, the moving magnetic core 3 is disposed through the frame 1, the first end of the moving magnetic core 3 is connected to a pawl 8, and the elastic element 4 abuts between the frame 1 and the moving magnetic core 3. The static magnetic component is used to generate a force F1 to drive the moving magnetic core 3 to move, and F1 changes as the moving magnetic core 3 moves. The elastic element 4 is used to generate a force F2 to drive the first end of the moving magnetic core 3 to extend outward. When the vehicle is not parked, the moving magnetic core 3 is in the initial position. When parking is required, the electromagnet is powered in the positive direction, causing the moving magnetic core 3 to extend from the initial position and pass through the first position to the parking position, which drives the pawl 8 to move and engage in the groove between the two ratchet teeth of the ratchet 7. When the electromagnet is not powered and the moving magnetic core 3 is in the first position, F1=F2, and the stroke length S1 of the moving magnetic core 3 from the parking position to the first position is greater than the ratchet tooth height H of the ratchet 7.

[0051] In this embodiment, the static magnetic component generates a force F1 that drives the moving magnetic core 3 to move. The value of F1 changes as the moving magnetic core 3 moves. The elastic element 4 generates a force F2 that drives the first end of the moving magnetic core 3 to extend outward. When the electromagnet is not energized, the resultant force of F1 and F2 is the resultant force on the moving magnetic core 3. When not parked, the moving magnetic core 3 is in the initial position, at which time the pawl 8 is separated from the ratchet 7, and it is in the parking released state. When parking is required, the electromagnet is positively energized, driving the moving magnetic core 3 to extend outward from the initial position and through the first position to the parking position, causing the pawl 8 to move and engage in the tooth groove between the two ratchet teeth of the ratchet 7. At this time, the pawl 8 is engaged with the ratchet 7, and it is in the parking state. When parking is completed, the electromagnet is de-energized, and the resultant force of F1 and F2, that is, the resultant force on the moving magnetic core 3, drives the moving magnetic core 3 to remain extended. After parking is completed and the electromagnet is de-energized for a period of time, the clamping force at the wheel end will gradually decrease due to the continuous drop in temperature of components such as the wheel end friction plate and the clamp body assembly. When the clamping force at the wheel end drops to a certain value, the vehicle may roll away. To prevent this, after parking for a period of time, the motor 6 can be activated according to the program to increase the clamping force. During this process, the electromagnet is not energized, and it is necessary to ensure that the pawl 8 and the ratchet 7 do not disengage. The moving magnetic core 3 moves from the parking position to the initial position, that is, the moving magnetic core 3 retracts. During this process, it passes through the first position. When the moving magnetic core 3 is in the first position, F1=F2, and the travel length S1 of the moving magnetic core 3 from the parking position to the first position is set to be greater than the ratchet tooth height H of the ratchet 7. Even if the moving magnetic core 3 moves a stroke length H from the parking position, that is, moves the height of one ratchet, the resultant force of the moving magnetic core 3 is always greater than 0. Thus, the elastic element 4 can always provide a positive holding force. The electromagnet can work with the motor 6 to achieve the anti-rollover function without energizing it, improving the adverse effect of the electromagnet failing unexpectedly when the power is cut off, and making it reliable and stable in use.

[0052] The EMB parking structure provided by this utility model includes the aforementioned electromagnet. The EMB parking structure has a function of re-clamping after slippage. It does not require energizing the electromagnet. The motor 6 can directly rotate in the pressure-building direction to increase the pressure, and the effect is reliable and stable.

[0053] For example, before the moving magnetic core 3 moves from the parking position to the first position, the resultant force of the moving magnetic core 3 is always greater than 0. Since the resultant force of the moving magnetic core is greater than 0, the moving magnetic core 3 will always have an outward extension tendency, causing the pawl 8 to have a tendency to approach and engage with the tooth groove of the ratchet 7.

[0054] In this embodiment, when the moving magnetic core 3 is in the parking position, the motor 6 continues to rotate, driving the ratchet 7 to rotate relative to the pawl 8. This causes the pawl 8 to move out of the current tooth slot and engage in the next adjacent tooth slot. The stroke length of the moving magnetic core 3 corresponding to the pawl 8 moving out of the current tooth slot is less than or equal to the stroke length S1 of the moving magnetic core 3 between the first position and the parking position. This configuration ensures that when the pawl 8 moves out of the current tooth slot, the resultant force of the moving magnetic core remains greater than 0, and the elastic element 4 stably provides a positive holding force.

[0055] Furthermore, when the electromagnet is not energized, the second position is when the magnetic force on the moving magnetic core 3 from the static magnetic component is zero. The third position is when the motor 6 rotates, driving the ratchet 7 to rotate relative to the pawl 8 until the pawl 8 moves out of the current tooth slot, corresponding to the position of the moving magnetic core 3. The travel length between the second position and the parking position is S2, and the travel length between the third position and the parking position is S3; therefore, S2 < S3 < S1. Specifically, the travel lengths S2 and S3 between the second and parking positions are both less than S1, and the resultant force of the moving magnetic core is always a positive holding force. Specifically, when the moving magnetic core 3 is between the parking position and the second position, the magnetic force on the moving magnetic core 3 from the static magnetic component is always greater than zero; when the moving magnetic core 3 is between the second position and the initial position, the magnetic force on the moving magnetic core 3 from the static magnetic component is always less than zero.

[0056] In this embodiment, the electromagnet also includes a coil 24 wound on the frame 1. When the coil 24 is positively energized, it drives the moving magnetic core 3 from the initial position to the parking position; when the coil 24 is negatively energized, it drives the moving magnetic core 3 from the parking position to the initial position. Specifically, when the coil 24 is energized in different directions, it can drive the moving magnetic core 3 to reciprocate between the initial position and the parking position.

[0057] In this embodiment, the static magnetic assembly includes a first static magnetic core 21, a second static magnetic core 22, and a magnetic element 23; wherein,

[0058] The first stationary magnetic core 21, the second stationary magnetic core 22, and the magnetic element 23 can all generate magnetic force on the moving magnetic core 3. When the moving magnetic core 3 is in the parking position, the first stationary magnetic core 21 and the moving magnetic core 3 are attracted together; when the moving magnetic core 3 is in the initial position, the second stationary magnetic core 22 and the moving magnetic core 3 are attracted together. Specifically, as the moving magnetic core 3 moves relative to the magnetic element 23, that is, as the moving magnetic core 3 moves between the first stationary magnetic core 21 and the second stationary magnetic core 22, the magnitude of F1 changes with the movement of the moving magnetic core 3.

[0059] Specifically, when the vehicle is not parked, the moving magnetic core 3 and the second stationary magnetic core 22 are attracted to each other, with their relative positions referenced. Figure 3 As shown. At this time, the magnetic force F1 on the moving magnetic core 3 is generated by the magnetic component 23. In addition, under the action of the elastic component 4, the elastic component 4 generates an elastic force F2 on the moving magnetic core 3 towards the first end of the frame 1, that is, the moving magnetic core 3 extends outward. Therefore, the resultant force F3 received by the moving magnetic core 3 at this time is specifically: F3 = F1 - F2.

[0060] When parking is required, a positive current is input to the PIN pin at the end of coil 24. The current is transmitted to coil 24, generating an electromagnetic force F4 that causes the moving magnetic core 3 to move towards the first end of the frame 1, extending the moving magnetic core 3 outwards. This force increases with the increase of the current. When F4 > F3, the electromagnetic force will drive the moving magnetic core 3 to extend outwards to the parking position. At this time, the current value is defined as I1. Considering some deviation fluctuations, the control current of coil 24 is defined as I2, where I2 = I1 + current margin. When a positive current I2 flows through the two ends of coil 24, the outward extension force F5 on the moving magnetic core 3 is F4 - F1 + F2.

[0061] When the electromagnet reaches the parking position, the moving magnetic core 3 attracts the first stationary magnetic core 21. The magnetic force generated by the magnetic component 23 pushes the moving magnetic core 3 to attract the first stationary magnetic core 21. At this time, the magnetic force of the magnetic component 23 is F1'. Then, when the current on the coil 24 is not disconnected, the electromagnetic force F4' generated by the coil 24 on the moving magnetic core 3, and the extension force of the elastic component 4 is F2'. At this time, the holding force on the moving magnetic core 3 is F5' = F4' + F1' + F2'. After determining that parking is successful, the current across the coil 24 is disconnected. At this time, the electromagnetic force F4' drops to 0, and the extension holding force on the moving magnetic core 3 is F5'' = F1' + F2'. The magnitude of this force F5'' can be defined through simulation and related high and low temperature vibration durability tests of the system. At this time, the position of the moving magnetic core 3 is as follows: Figure 4As shown. When a parking release command is received, a reverse current is applied to the two ends of coil 24. At this time, coil 24 will generate a reverse electromagnetic force F4'' on the moving magnetic core 3. When F4'' > F5'', the moving magnetic core 3 moves towards the second end of the frame 1, i.e., in the retraction direction. The current value at this time is defined as I1'. Considering some deviation fluctuations, the control current of coil 24 is defined as I2', I2' = I1' + current margin. When a reverse current I2' is applied to the two ends of coil 24, the retraction force F6 on the moving magnetic core 3 is F4'' - F1' - F2'. When the moving magnetic core 3 is attracted to the second stationary magnetic core 22, refer to... Figure 3 As shown, the retraction force F6' = F4'' + F1 - F2 at this point, and the holding force after power failure is F3 = F1 - F2 in the initial unparked state. The magnitude of this force F3 can be defined through simulation and related high and low temperature vibration durability tests of the system. The force change of the moving magnetic core 3 on the electromagnet is as follows: Figure 13 As shown in the diagram. S1 represents the stroke of the moving magnetic core 3 when the electromagnet is not energized, retracting inward from the parking position to a total force value of 0, i.e., F3 = F2 - F1 = 0. This is also the stroke of the moving magnetic core 3 between the parking position and the first position. When the retraction stroke of the moving magnetic core 3 does not exceed S1 and F3 > 0, the moving magnetic core 3 will continue to extend outward. When the retraction stroke of the moving magnetic core 3 exceeds S1 and F3 < 0, the moving magnetic core 3 will continue to retract. S2 is the stroke of the moving magnetic core 3 between the position where the magnetic force from the static magnetic component is 0 and the parking position, i.e., the stroke length between the parking position and the second position. S3 is the stroke of the moving magnetic core 3 between the position where the motor 6 rotates to drive the ratchet 7 to rotate relative to the pawl 8 until the pawl 8 moves out of the current tooth slot, and the parking position, i.e., the stroke length between the parking position and the third position.

[0062] Reference Figures 5 to 12 As shown, Figure 5 This is a schematic diagram of the transmission structure of the EMB parking mechanism. The motor 6 is mounted on the housing 5, and a ratchet 7 is press-fitted onto the motor 6. The motor 6 is connected to the caliper assembly. During operation, the motor 6 shaft transmits rotation to the caliper assembly, driving the caliper to travel and clamping force. The diagram illustrates a clockwise increase in clamping force (there are also structures that increase force counterclockwise; the clockwise and counterclockwise descriptions in this invention are only for the currently displayed structure and do not constitute a specific definition of direction). Specifically, when parking, the pawl 8 rotates clockwise towards the ratchet teeth of the ratchet 7 until the pawl 8 engages with the ratchet teeth of the ratchet 7. Figure 10The diagram illustrates the engagement of pawl 8 with ratchet 7 when the vehicle is parked. Pawl 8 engages with the ratchet teeth, which have uneven angles on both sides, creating an inclined tooth shape. After engagement, pawl 8 cannot rotate counter-clockwise, but clockwise, the torque can still push it to rotate. When the parking brake is released, pawl 8 rotates counter-clockwise, moving away from the ratchet teeth of ratchet 7, until it disengages and returns to its initial engaged state. Figure 9 The image shows the position of pawl 8 relative to ratchet 7 after the parking brake is released.

[0063] Furthermore, upon receiving a parking command, motor 6 rotates. When the clamping force of the clamp assembly reaches the target parking force, a positive current is supplied to both ends of the electromagnet via an external control element. The moving magnetic core 3 of the electromagnet extends outward under the action of electromagnetic force, driving the pawl 8 to rotate and engaging the ratchet teeth, thus parking. Then, the current to both ends of the electromagnet is disconnected, and the electromagnet enters the parking holding state. At this time, the parking extension holding force of the electromagnet is F5''. Upon receiving a parking release command, a reverse current is supplied to both ends of the electromagnet via an external control element. The moving magnetic core 3 tends to retract under the action of electromagnetic force, but due to the meshing structure of the ratchet 7 and the pawl 8, the pawl 8 cannot directly pull out the ratchet teeth of the ratchet 7. At this time, the external control element controls motor 6 to rotate clockwise by a certain angle, so that the pawl 8 and the ratchet 7 rotate to a relative angle where they can disengage. Then, under the action of the retraction force of the moving magnetic core 3 of the electromagnet, the pawl 8 rotates in the opposite direction and disengages from the ratchet. Then, under the action of the retraction force, the moving magnetic core 3 moves toward the second end of the frame 1 and returns to the retracted state, maintaining the attraction force F3, thus realizing the parking release.

[0064] Furthermore, if the wheel end friction pads and brake discs are very hot when the parking command is executed and the vehicle is correctly parked, the wheel end clamping force will decrease as the temperature drops after a period of time. When the wheel end clamping force drops to a certain value, the vehicle may roll away. Therefore, to avoid this rolling away, when a high parking temperature is detected, exceeding the set threshold, the high-temperature re-clamping command needs to be activated. After a certain period of time following the parking command, motor 6 is controlled to rotate clockwise again to increase the clamping force. During the clockwise rotation of motor 6, the pawl 8 is pushed out of the ratchet teeth. Figure 12 As shown, at this time, the pawl 8 will push the moving magnetic core 3 to move a certain distance from the parking position, such as... Figure 13As shown, as long as the length of this stroke is less than S1, the moving magnetic core 3 still has a certain parking extension force, pushing the pawl 8 to press against the surface of the ratchet. After the motor 6 rotates through a certain angle, the pawl 8 will enter the next tooth slot of the ratchet 7 under the action of the pushing force of the moving magnetic core 3, continuing to restrict the retraction of the motor 6. The rotation angle of the motor 6 is calculated by combining the required increase in clamping force and the angle corresponding to the rotation of one ratchet tooth of the ratchet 7. During this process, the electromagnet is always in a de-energized state, and the external control components do not need to energize the electromagnet again to control its action, which can avoid parking failure caused by the electromagnet being re-energized, thus improving reliability. When the parking slope or other environmental changes are detected within a certain period of time, resulting in insufficient parking force, the slippage re-clamping function needs to be activated, controlling the motor 6 to rotate clockwise to increase the parking clamping force. The slippage re-clamping process is similar to high-temperature re-clamping.

[0065] In this embodiment, the frame 1 has a through hole 11 extending from its first end to its second end. The first static magnetic core 21 is disposed at the first end of the through hole 11, and the second static magnetic core 22 is disposed at the second end of the through hole 11. The first static magnetic core 21 passes through the first end of the moving magnetic core 3, and the second static magnetic core 22 passes through the second end of the moving magnetic core 3.

[0066] More specifically, the moving magnetic core 3 includes a first core 31, a second core 32, and a third core 33 arranged sequentially. The diameter of the second core 32 is larger than the diameters of the first core 31 and the third core 33. The first stationary magnetic core 21 has a first hole 211, and the second stationary magnetic core 22 has a second hole 221. The first core 31 slides through the first hole 211, the second core 32 slides within the through hole 11, and the third core 33 slides through the second hole 221. The distance between the first stationary magnetic core 21 and the second stationary magnetic core 22 is greater than the length of the second core 32. Specifically, the moving magnetic core 3 is designed as a structure that is thicker in the middle and thinner at both ends. The first core 31 and the second core 32 are respectively fitted with the first stationary magnetic core 21 and the second stationary magnetic core 22. The first stationary magnetic core 21 and the second stationary magnetic core 22 form a limiting fit at both ends of the moving magnetic core 3, ensuring a reasonable range of movement and extension of the moving magnetic core 3. In addition, the distance between the first static magnetic core 21 and the second static magnetic core 22 is A, and the length of the second core 32 is B. AB is the range of movement of the moving magnetic core 3 as it extends and retracts.

[0067] For example, the first core 31, the second core 32 and the third core 33 are integrally formed.

[0068] Specifically, the first end of the moving magnetic core 3 is provided with a connector 34, and the connector 34 is provided with a first hinge shaft 35. The pawl 8 is correspondingly provided with a first hinge hole 81. The first hinge hole 81 is set as an elongated hole. The first hinge shaft 35 can be hinged with the first hinge hole 81 and can move along the length direction of the first hinge hole 81. In this embodiment, the first hinge hole 81 is set as an elongated hole. In addition to realizing the hinge function, the first hinge shaft 35 can also slide within the first hinge hole 81, thereby realizing the relative position change between the pawl 8 and the moving magnetic core 3, avoiding jamming between the pawl 8 and the moving magnetic core 3, and ensuring the smooth operation of the moving magnetic core 3 and the pawl 8.

[0069] Furthermore, the motor 6 housing is provided with a second hinge shaft 61, and the pawl 8 is provided with a corresponding second hinge hole 82. The second hinge shaft 61 is rotatably inserted through the second hinge hole 82, and the hinge between the pawl 8 and the motor 6 housing, i.e. the outer shell 5, is realized through the second hinge shaft 61.

[0070] In this embodiment, the elastic element 4 is configured as a spring, which is sleeved on the moving magnetic core 3 and the connector 34. Specifically, the two opposite ends of the spring abut against the frame 1 and the connector 34, respectively, thereby applying an elastic force to the moving magnetic core 3. Specifically, the frame 1 has a first baffle 12 at its first end, and the connector 34 has a second baffle 341. The first end of the spring abuts against the first baffle 12, and the second end abuts against the second baffle 341. Specifically, the elastic element 4 is located at the first end of the frame 1, that is, the end of the moving magnetic core 3 that extends outward.

[0071] In this embodiment, the frame 1 has a groove 13, and the magnetic component 23 is embedded in the groove 13. Specifically, the groove 13 is an annular groove, and the magnetic component 23 is an annular structure and is fixedly embedded in the annular groove 13.

[0072] In this embodiment, the first static magnetic core 21, the second static magnetic core 22, the magnetic component 23, and the moving magnetic core 3 are all made of magnets. This provides reliable magnetism, is inexpensive, and is easy to manufacture.

[0073] In this embodiment, the outer casing 5 is provided with a first gear 51, a second gear 52 and a third gear 53. The first gear 51 is fixedly sleeved on the output shaft of the motor 6, the second gear 52 is rotatably connected to the outer casing 5, and the third gear 53 is connected to the planetary gear of the clamp assembly. The first gear 51 is meshed with the second gear 52, and the second gear 52 is meshed with the third gear 53.

[0074] Specifically, a first gear 51, a second gear 52, and a third gear 53 are provided between the motor 6 and the planetary gears of the clamp assembly. When the output shaft of the motor 6 rotates, it sequentially drives the first gear 51, the second gear 52, and the third gear 53 to rotate, which in turn drives the planetary gears of the clamp assembly, which in turn drives the ball screw structure, pushes the friction plate, and generates a clamping force on the wheel.

[0075] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An electromagnet for an EMB parking structure, the EMB parking structure comprising a motor (6), a ratchet (7) connected to the motor (6), and a pawl (8) cooperating with the ratchet (7), characterized in that, The electromagnet includes a frame (1), a static magnetic assembly, a moving magnetic core (3), and an elastic element (4); wherein, The static magnetic component is disposed inside the frame (1), the moving magnetic core (3) is disposed through the frame (1), the first end of the moving magnetic core (3) is connected to the pawl (8), the elastic element (4) abuts between the frame (1) and the moving magnetic core (3), the static magnetic component is used to generate a force F1 to drive the moving magnetic core (3) to move, F1 changes with the movement of the moving magnetic core (3), and the elastic element (4) is used to generate a force F2 to drive the first end of the moving magnetic core (3) to extend outward; When the vehicle is not parked, the moving magnetic core (3) is in its initial position; When parking is required, the electromagnet is powered in the positive direction, causing the moving magnetic core (3) to extend from the initial position and through the first position to the parking position, which drives the pawl (8) to move and engage in the groove between the two ratchet teeth of the ratchet (7); when the electromagnet is not powered and the moving magnetic core (3) is in the first position, F1=F2, and the stroke length S1 of the moving magnetic core (3) from the parking position to the first position is greater than the ratchet tooth height H of the ratchet (7).

2. The electromagnet according to claim 1, characterized in that, When the moving magnetic core (3) is in the parking position, the motor (6) continues to rotate, which can drive the ratchet (7) to rotate relative to the pawl (8), so that the pawl (8) moves out of the current tooth groove and is engaged in the next adjacent tooth groove, and the stroke length of the moving magnetic core (3) corresponding to the current tooth groove is less than or equal to the stroke length S1 of the moving magnetic core (3) between the first position and the parking position.

3. The electromagnet according to claim 1, characterized in that, When the electromagnet is not energized, the position where the magnetic force of the moving magnetic core (3) is 0 from the static magnetic component is the second position. The rotation of the motor (6) drives the ratchet (7) to rotate relative to the pawl (8) until the pawl (8) moves out of the position of the moving magnetic core (3) corresponding to the current tooth groove, which is the third position. The travel length between the second position and the parking position is S2, and the travel length between the third position and the parking position is S3; then S2 < S3 < S1.

4. The electromagnet according to claim 1, characterized in that, It also includes a coil (24) wound on the frame (1); wherein, When the coil (24) is energized in the positive direction, it can drive the moving magnetic core (3) to move from the initial position to the parking position; when the coil (24) is energized in the negative direction, it can drive the moving magnetic core (3) to move from the parking position to the initial position.

5. The electromagnet according to claim 1, characterized in that, The static magnetic assembly includes a first static magnetic core (21), a second static magnetic core (22), and a magnetic component (23); wherein, The first static magnetic core (21), the second static magnetic core (22) and the magnetic component (23) can all generate magnetic force on the moving magnetic core (3). When the moving magnetic core (3) is in the parking position, the first static magnetic core (21) attracts the moving magnetic core (3); when the moving magnetic core (3) is in the initial position, the second static magnetic core (22) attracts the moving magnetic core (3).

6. The electromagnet according to claim 5, characterized in that, The frame (1) has a through hole (11) extending from its first end to its second end. The first static magnetic core (21) is located at the first end of the through hole (11), and the second static magnetic core (22) is located at the second end of the through hole (11). The first static magnetic core (21) passes through the first end of the moving magnetic core (3), and the second static magnetic core (22) passes through the second end of the moving magnetic core (3).

7. The electromagnet according to claim 6, characterized in that, The moving magnetic core (3) includes a first core (31), a second core (32) and a third core (33) arranged in sequence. The diameter of the second core (32) is larger than the diameters of the first core (31) and the third core (33). The first static magnetic core (21) has a first hole (211) and the second static magnetic core (22) has a second hole (221). The first core (31) slides through the first hole (211), the second core (32) slides in the through hole (11), and the third core (33) slides through the second hole (221). The distance between the first static magnetic core (21) and the second static magnetic core (22) is greater than the length of the second core (32).

8. The electromagnet according to claim 1, characterized in that, The first end of the moving magnetic core (3) is provided with a connector (34), the connector (34) is provided with a first hinge shaft (35), the pawl (8) is provided with a first hinge hole (81), the first hinge hole (81) is set as an elongated hole, the first hinge shaft (35) can be hinged with the first hinge hole (81) and can move along the length direction of the first hinge hole (81).

9. The electromagnet according to claim 8, characterized in that, The elastic element (4) is configured as a spring, which is sleeved on the moving magnetic core (3) and the connector (34).

10. The electromagnet according to claim 9, characterized in that, The frame (1) has a first baffle (12) at its first end, and the connector (34) has a second baffle (341). The first end of the spring abuts against the first baffle (12), and the second end abuts against the second baffle (341).

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