Electromagnetic actuator and braking and parking mechanism thereof

Abstract

The invention relates to an electromagnetic actuator and a braking and parking mechanism thereof, and the electromagnetic actuator comprises a shell which is provided with a first end face and a second end face which are oppositely arranged; the coil assembly is arranged in the shell, and an accommodating channel is formed in the coil assembly; the push rod is movably arranged in the containing channel, and the end of the push rod penetrates through the first end face in the length direction of the push rod; the first moving iron and the second moving iron are movably arranged in the containing channel and arranged in the length direction of the push rod, one of the first moving iron and the second moving iron is connected to the push rod, and the other of the first moving iron and the second moving iron is connected to the push rod. The first moving iron and the second moving iron are configured to move along the length direction of the push rod under the action of electromagnetic force in a power-on state of the coil assembly and drive the push rod to move; and the first elastic piece is connected to the first moving iron and the second moving iron, and the first elastic piece is configured to push the first moving iron and the second moving iron to move in the direction away from each other.

Description

Technical Field

[0001] This application relates to the field of vehicle drive-by-wire chassis braking technology, and in particular to electromagnetic actuators and their braking and parking mechanisms. Background Technology

[0002] In the field of automotive braking technology, electro-mechanical brakes (EMB), as an advanced braking system, are gradually receiving widespread attention and application. With the continuous development of automotive technology, EMBs are showing a trend towards miniaturization to meet the demands of compact wheel-side space.

[0003] In electromagnetic actuators of related technologies, a single-stage moving iron structure is commonly used. However, this single-stage moving iron structure has certain drawbacks. Due to its long travel distance, it generates significant noise during operation, affecting the quietness of the vehicle interior and the comfort of passengers. Furthermore, the moving iron needs to overcome a large spring force during movement, which not only increases the energy consumption and reduces energy utilization efficiency of the electromagnetic actuator but also adversely affects its overall performance, limiting its further application and development in pursuit of high efficiency, low noise, and energy saving. Summary of the Invention

[0004] Based on this, an electromagnetic actuator and its braking and parking mechanism are provided to optimize the travel of the moving iron and effectively improve the performance of the electromagnetic actuator.

[0005] An electromagnetic actuator, comprising:

[0006] The housing has a first end face and a second end face that are disposed opposite to each other;

[0007] A coil assembly is disposed within the housing, and the coil assembly has an accommodating channel inside;

[0008] A push rod is movably disposed within the receiving channel, and the end of the push rod extends through the first end face along its length.

[0009] The first moving iron and the second moving iron are movably disposed in the receiving channel and arranged along the length direction of the push rod. One of the first moving iron and the second moving iron is connected to the push rod. The first moving iron and the second moving iron are configured to move along the length direction of the push rod by electromagnetic force when the coil assembly is energized, thereby driving the push rod to move.

[0010] And a first elastic element, connected to the first moving iron and the second moving iron, the first elastic element being configured to push the first moving iron and the second moving iron to move away from each other.

[0011] In one of the embodiments, the first moving iron is located on the side of the second moving iron away from the first end face;

[0012] The first moving iron is connected with the push rod; the first moving iron and the second moving iron are configured to move along the side close to the first end face and drive the push rod to extend out of the first end face in the energized state of the coil assembly.

[0013] In one of the embodiments, the electromagnetic actuator further comprises a second elastic member arranged between the second moving iron and the first end face, and the second elastic member is configured to push the second moving iron to move away from the first end face.

[0014] In one of the embodiments, the radially inner wall of the second moving iron is provided with a first groove;

[0015] The second elastic member is sleeved on the push rod, and at least part of the structure of the second elastic member extends into the first groove; wherein the first groove has a first step surface facing the first end face and connected with the second elastic member.

[0016] In one of the embodiments, the first moving iron is fixedly connected with the end of the push rod close to the second end face of the shell.

[0017] In one of the embodiments, one end of the first elastic member abuts against the first moving iron, and the other end abuts against the second moving iron.

[0018] In one of the embodiments, the first moving iron is provided with a first channel, and the push rod is movably arranged in the first channel.

[0019] In one of the embodiments, the push rod is provided with a stop platform, one end of the first elastic member abuts against the second moving iron, and the other end abuts against the stop platform.

[0020] In one of the embodiments, the second moving iron is located on the side of the first moving iron close to the first end face; the second moving iron is connected with the push rod; the first moving iron and the second moving iron are configured to move along the side close to the second end face of the shell and drive the push rod to retract into the first end face in the energized state of the coil assembly.

[0021] In one of the embodiments, the electromagnetic actuator further comprises a second elastic member arranged between the first moving iron and the second end face, and the second elastic member is configured to push the first moving iron to move away from the second end face.

[0022] In one of the embodiments, the push rod further penetrates through the second end face of the shell.

[0023] In one of the embodiments, the second moving iron is provided with a second groove;

[0024] The first elastic member is sleeved on the push rod, and at least part of the structure of the first elastic member extends into the second groove; wherein the second groove has a second step surface facing the second end surface and connected with the first elastic member.

[0025] In one of the embodiments, the electromagnetic actuator is a single-stable actuator, and the coil assembly comprises a group of coils.

[0026] In one of the embodiments, the electromagnetic actuator is a double-stable actuator, and the coil assembly comprises a first group of coils and a second group of coils, the first group of coils and the second group of coils being arranged on two sides along the length direction of the push rod.

[0027] A brake parking mechanism comprises a body, a locking mechanism, and an electromagnetic actuator as described above, the locking mechanism comprises a locking ratchet and a locking pawl, the locking pawl is configured to be clamped on the locking ratchet in the extended or retracted state of the push rod of the electromagnetic actuator.

[0028] The electromagnetic actuator and the brake parking mechanism thereof described above, the electromagnetic actuator adopts the structure that the first moving iron and the second moving iron are arranged along the length direction of the push rod, forming a double-stage moving iron structure, and under the cooperation of the first elastic member, the long stroke movement is dispersed into the relatively short stroke movement of the first moving iron and the second moving iron. As the moving stroke of each moving iron is shortened, the vibration generated by the collision, friction, etc. with the surrounding components in the moving process is reduced, thereby effectively reducing the noise during operation and creating a more quiet and comfortable environment in the vehicle. Meanwhile, the first elastic member is connected to the first moving iron and the second moving iron, and the force of the first elastic member is to move the first moving iron and the second moving iron in the direction away from each other. When driving the push rod to move, the first moving iron and the second moving iron each bear a part of the force, and the relatively large spring force to be overcome is dispersed into two moving irons to overcome the relatively small force, thereby reducing the spring force to be overcome by each moving iron during movement, reducing the energy consumption of the electromagnetic actuator, and improving the energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the brake parking mechanism in one of the exemplary embodiments.

[0030] Figure 2 It is an exploded schematic diagram of the electromagnetic actuator in one of the exemplary embodiments.

[0031] Figure 3 It is a top view schematic diagram of the brake parking mechanism in one of the exemplary embodiments.

[0032] Figure 4A-A cross-sectional view of one exemplary embodiment shown in FIG. Figure 3 A-A cross-sectional view of one exemplary embodiment shown in FIG.

[0033] Figure 5 A-A cross-sectional view of one exemplary embodiment shown in FIG. Figure 3 A-A cross-sectional view of one exemplary embodiment shown in FIG.

[0034] Figure 6 A-A cross-sectional view of one exemplary embodiment shown in FIG. Figure 3 A-A cross-sectional view of one exemplary embodiment shown in FIG.

[0035] Figure 7 A-A cross-sectional view of one exemplary embodiment shown in FIG. Figure 3 A-A cross-sectional view of one exemplary embodiment shown in FIG.

[0036] Reference signs:

[0037] 1, housing; 11, accommodating space; 12, first end cover; 121, first end face; 1211, first annular groove; 13, barrel; 131, avoiding opening; 14, second end cover; 141, second end face; 142, through hole; 2, coil assembly; 21, accommodating channel; 3, push rod; 31, blocking table; 4, first moving iron; 41, first channel; 5, second moving iron; 51, first recess; 511, first step surface; 52, second recess; 521, second step surface; 6, first elastic member; 7, second elastic member; 8, guide sleeve; 81, guide groove; 9, locking mechanism; 91, locking pawl; 92, locking ratchet; 93, elastic reset member; 931, tension spring; 9311, hook; 932, second shaft body; 9321, baffle; 933, third shaft body; 94, first shaft body. DETAILED DESCRIPTION

[0038] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a sufficient understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0039] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0040] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0041] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0042] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are used for explanation only and are not intended to be limiting.

[0044] In the related art, the electromagnetic actuator generally adopts a single-stage moving iron structure. This single-stage moving iron structure has some prominent defects in practical application, mainly embodied in the following two aspects:

[0045] On the one hand, in order to ensure that a single moving iron can complete the specified action stroke, a relatively long spring needs to be arranged to reset the moving iron. However, when the spring is relatively long, a relatively large spring force will be generated during its compression and expansion. Once the coil of the electromagnetic actuator is energized, the electromagnetic force drives the moving iron to move, and this relatively large spring force must be overcome. This makes the electromagnetic actuator need to have higher electromagnetic force output capability, which invisibly increases the design difficulty and manufacturing cost of the electromagnetic actuator, and also has higher requirements for the power supply and other supporting components of the electromagnetic actuator, thereby restricting the development of the electromagnetic actuator in the direction of miniaturization and light weight.

[0046] On the other hand, since the entire stroke of the push rod needs to be completed by a single moving iron, in order to enable the electromagnetic actuator to quickly respond and shorten the reaction time in the braking and other locking actions, the moving iron must move at a relatively fast speed. However, when the moving iron moves quickly to the end of the stroke and stops, a relatively large impact force will be generated, thereby causing a relatively large impact noise. This impact noise not only affects the comfort of the driver and passengers in the vehicle, but also can cause certain damage to the structure of the electromagnetic actuator itself, thereby reducing its service life and reliability.

[0047] Therefore, how to improve the structure of the electromagnetic actuator to overcome the above-mentioned defects of the single-stage moving iron structure has become a problem to be solved in the current automobile braking technology field.

[0048] The present disclosure provides an electromagnetic actuator adopting a double-stage moving iron structure in which a first moving iron and a second moving iron are arranged along the length direction of a push rod, and a first elastic member is connected to the first moving iron and the second moving iron, and the first elastic member can resist the movement of the first moving iron and the second moving iron in the direction away from each other.

[0049] The two-stage moving iron structure divides the entire stroke into two moving irons, so that the required moving stroke of each moving iron is significantly shortened, and accordingly, the length of the first elastic member is also shortened. During the compression and expansion of the first elastic member, the generated elastic force is greatly reduced. When the coil assembly is energized, the electromagnetic force causes the first moving iron and the second moving iron to move, and the required elastic force to be overcome is significantly reduced, thereby reducing the requirement for the electromagnetic force output capability of the electromagnetic actuator. Not only effectively reduces the design difficulty and manufacturing cost of the electromagnetic actuator, but also reduces the requirement for the power supply and other supporting components, and creates favorable conditions for the miniaturization and light weight of the electromagnetic actuator.

[0050] Meanwhile, in the two-stage moving iron structure in the present disclosure, the first moving iron and the second moving iron are sequentially arranged along the length direction of the push rod and jointly drive the push rod to move. Since the stroke is reasonably shared by the two moving irons, each moving iron does not need to move at an extremely fast speed like a single-stage moving iron to meet the stroke requirement of the push rod. When the moving iron moves to the end of the stroke and stops, the impact force generated is relatively small. This small impact force effectively reduces the generation of impact noise, creating a more quiet and comfortable environment for the driver and passengers in the vehicle, greatly improving the comfort of driving and riding. In addition, the small impact force also greatly reduces the damage to the structure of the electromagnetic actuator itself, reduces the problems of wear and loosening of components, and thereby significantly improves the service life and reliability of the electromagnetic actuator, reduces the frequency and cost of maintenance and replacement.

[0051] In some exemplary embodiments, as shown in Figures 1-3 , Figure 5 An electromagnetic actuator for use in the electronic parking brake system in the automotive field, as shown in some exemplary embodiments.

[0052] The housing 1 serves as the basic support structure of the entire electromagnetic actuator, and has an accommodation space 11 inside for accommodating other components. The housing 1 has a first end face 121 and a second end face 141 arranged opposite to each other, providing positioning reference for the installation and movement of subsequent components. The housing 1 can be made of high-strength, corrosion-resistant metal materials such as stainless steel through casting or machining process to ensure that it can withstand various external forces and environmental influences during vehicle operation.

[0053] In an example, the shell 1 comprises a first end cover 12, a barrel 13 and a second end cover 14. The barrel 13 is a cylindrical structure and is sleeved on the coil assembly 2. The first end cover 12 and the second end cover 14 are respectively arranged on two sides of the barrel 13 along the length direction of the barrel 13, and the first end cover 12 and the second end cover 14 are reliably connected with the barrel 13 by welding, bolt connection or buckle connection. The side of the second end cover 14 adjacent to the barrel 13 is a second end face 141, and the side of the first end cover 12 adjacent to the barrel 13 is a first end face 121.

[0054] The radial side wall of the barrel 13 is provided with a avoiding opening 131, so that part of the structure of the coil assembly 2 can protrude to the outside of the shell 1 to meet the connection with other components or functional realization and other requirements. The shape and size of the avoiding opening 131 are designed according to the specific shape and size of the part of the coil assembly 2 that needs to protrude to the outside of the shell 1.

[0055] In the embodiment, as shown in Figures 1-3 , Figure 5 , the coil assembly 2 is arranged in the accommodating space 11 and is connected with the shell 1. The connection mode can adopt threaded connection, buckle connection, welding or bonding. For example, when threaded connection is adopted, internal threads are arranged on the shell 1, and external threads are arranged on the outer shell of the coil assembly 2, and the coil assembly 2 is fixed on the shell 1 by rotating. The coil assembly 2 has an accommodating channel 21 for accommodating other components, such as a push rod 3, a first moving iron 4 and a second moving iron 5.

[0056] The coil assembly 2 is a key component of the electromagnetic actuator to generate a magnetic field. When the coil assembly 2 is powered, a magnetic field is generated around it. In actual manufacturing, the coil assembly 2 is wound by enameled wire, and the number of turns and the wire diameter are determined according to the design requirements of the electromagnetic actuator. For example, for an electromagnetic actuator that requires a larger magnetic force, the number of turns of the coil can be appropriately increased and thicker enameled wire can be selected. After winding, the coil assembly 2 is treated with paint dipping to improve its insulation and heat dissipation performance.

[0057] In the embodiment, as shown in Figures 1-3 , Figure 5 , the push rod 3 is movably arranged in the accommodating channel 21, and one end of the push rod 3 penetrates the first end face 121 along the length direction of the push rod 3. In the automotive application scenario, the structure that one end of the push rod 3 penetrates the shell 1 can be conveniently connected with other execution mechanisms of the automobile to realize power transmission. The material of the push rod is subject to actual conditions and needs to have certain strength and toughness to meet the wear resistance and fatigue resistance requirements in the process of frequent movement.

[0058] In the embodiment, as shown in Figures 1-3 , Figure 5As shown, the first moving iron 4 and the second moving iron 5 are movably arranged in the accommodating channel 21 and arranged along the length direction of the push rod 3. One of the first moving iron 4 and the second moving iron 5 is connected to the push rod 3, and the first moving iron 4 and the second moving iron 5 are configured to be moved along the length direction of the push rod 3 by electromagnetic force under the energized state of the coil assembly 2 and drive the push rod 3 to move.

[0059] For example, the first moving iron 4 is located on the side away from the first end face 121 of the second moving iron 5, that is, the first moving iron 4 is movably arranged on the side close to the second end face 141, and the second moving iron 5 is movably arranged on the side close to the first end face 121, which enables the first moving iron 4 and the second moving iron 5 to produce corresponding linear motion under the action of the magnetic field. The material of the first moving iron 4 and the second moving iron 5 is usually soft magnetic material, such as silicon steel sheet, which has good magnetic conductivity and can be quickly magnetized under the action of the magnetic field and quickly demagnetized after the magnetic field disappears, returning to the initial non-magnetic state. This feature enables the electromagnetic actuator to quickly respond to changes in the magnetic field, achieving efficient attraction and release actions and improving the working efficiency and stability of the entire electromagnetic actuator system.

[0060] For example, the second moving iron 5 is provided as one and adopts a ring structure, and the second moving iron 5 is sleeved on the push rod 3, which can uniformly surround the push rod 3, so that the magnetic force received by each part of the second moving iron 5 under the action of the magnetic field is basically consistent, thereby ensuring the stability and stability of the motion and avoiding the motion jamming or deviation phenomenon caused by uneven force, improving the accuracy and reliability of the motion control.

[0061] Alternatively, the second moving iron 5 can also be composed of multiple single bodies, and the single bodies are arranged in a circumferential ring around the push rod 3. This arrangement has great flexibility and can adjust the number and distribution of the second moving iron 5 according to actual needs.

[0062] The first moving iron 4 is connected to the push rod 3, and its structure form is also diverse, which can be a whole or set as multiple single bodies like the second moving iron 5. When the first moving iron 4 is a whole, it cooperates with the second moving iron 5 to achieve the function of attraction and driving the push rod 3 to move, regardless of whether the second moving iron 5 is a ring structure or a multiple single body structure. For example, the first moving iron 4 adopts a single structure and controls through attraction with the second moving iron 5, which is simple and reliable and has low cost. If the first moving iron 4 is set as multiple single bodies, the combination mode with the second moving iron 5 is more flexible.

[0063] When one of the first moving iron 4 and the second moving iron 5 is a plurality of single bodies, in order to ensure that the single bodies can move linearly along the length direction of the push rod 3, a corresponding limiting slide or the like structure needs to be arranged on the push rod 3 or the coil assembly 2. For example, in the case where the first moving iron 4 is a plurality of single bodies, a limiting slide matching the number and shape of the single bodies is processed on the push rod 3, so that each single body can only move along the length direction of the push rod 3 in the slide, thereby limiting the movement direction of the single bodies and avoiding the phenomenon of single body deviation or rotation caused by uneven magnetic field action, and ensuring the stability and reliability of the electromagnetic actuator.

[0064] When the coil assembly 2 is in the energized state, according to the principle of electromagnetic induction, a magnetic field will be generated around the coil assembly 2. The second moving iron 5 and the first moving iron 4 are moved along the length direction of the push rod 3 under the action of the electromagnetic force and drive the push rod 3 to move, so that one end of the push rod 3 passes through the first end face 121 to the outside or is retracted into the accommodating channel 21.

[0065] In the embodiment, as shown in Figures 1-3 、 Figure 5 The first elastic member 6 is connected to the first moving iron 4 and the second moving iron 5, and the first elastic member 6 is configured to resist the movement of the first moving iron 4 and the second moving iron 5 away from each other. The first elastic member 6 is a spring, for example, and is sleeved on the push rod 3, so that the first elastic member 6 can closely cooperate with the push rod 3 and deform correspondingly with the movement of the push rod 3. For example, one end of the first elastic member 6 abuts against the first moving iron 4, and the other end abuts against the second moving iron 5.

[0066] The electromagnetic actuator provided in the embodiment divides the entire stroke by setting the double-stage moving iron structure of the first moving iron 4 and the second moving iron 5 and arranging the first elastic member 6 connected to the two moving irons, so as to shorten the moving stroke of each moving iron and the length of the first elastic member 6. The elastic force generated during the compression and expansion of the first elastic member is greatly reduced. When the coil assembly 2 is energized and the electromagnetic force drives the first moving iron 4 and the second moving iron 5 to move, the elastic force to be overcome is significantly reduced, and the requirement for the electromagnetic force output capability of the electromagnetic actuator is also reduced. Not only the design difficulty and manufacturing cost of the electromagnetic actuator are effectively reduced, but also the requirement for the power supply and other supporting components is reduced, which creates favorable conditions for the development of the electromagnetic actuator in the direction of miniaturization and light weight.

[0067] Meanwhile, since the stroke is reasonably shared by the two moving irons, each moving iron does not need to move at an extremely fast speed like a single moving iron, and can meet the stroke requirement of the push rod 3. When the moving iron moves to the stroke end and stops, the impact force generated is relatively small. This small impact force effectively reduces the generation of impact noise, creating a more quiet and comfortable environment for the driver and passengers in the vehicle, greatly improving the comfort of the driver and passengers. In addition, the small impact force also greatly reduces the damage to the structure of the electromagnetic actuator itself, reduces the problems of wear and loosening of parts, and thus significantly improves the service life and reliability of the electromagnetic actuator, reduces the frequency and cost of maintenance and replacement.

[0068] The electromagnetic actuator in the embodiment solves the problems of large noise and the need to overcome a large spring force caused by the long moving stroke of the single moving iron structure through the design of the two-stage moving iron structure and the first elastic member 6, and reduces the influence of these adverse factors on the operation of the electromagnetic actuator. The lower noise level makes the electromagnetic actuator run more smoothly, reducing interference with other components; the smaller spring force reduces energy consumption and improves energy utilization efficiency, enabling the electromagnetic actuator to work more efficiently.

[0069] In some example embodiments, as shown in Figures 1-3 , Figure 5 The electromagnetic actuator also includes a second elastic member 7, which is arranged between the second moving iron 5 and the first end face 121, and is configured to push the second moving iron 5 to move away from the first end face 121. The second elastic member 7 is, for example, a spring, which is sleeved on the push rod 3.

[0070] The first example

[0071] The second elastic member 7 and the second moving iron 5 can adopt a spring slot or a hook, for example, to fix one end of the second elastic member 7 therein, ensuring that the second elastic member 7 can move together with the second moving iron 5 when the second moving iron 5 moves. The connection with the housing 1 can be achieved by fixing points, such as bolts or welding, at corresponding positions of the first end face 121, to firmly connect the other end of the second elastic member 7 to the housing 1, providing stable support for the second elastic member 7. This installation and connection method has the advantages of simple structure and reliable connection. It does not require complex mechanical structures or additional components, and can effectively connect the second elastic member 7 with the second moving iron 5 and the housing 1, reducing the manufacturing cost and assembly difficulty of the electromagnetic actuator.

[0072] When the coil assembly 2 is in the energized state, a strong magnetic field will be generated around the coil assembly 2 according to the principle of electromagnetic induction. Under the action of this magnetic field, the second moving iron 5 will be attracted and attracted to the first end face 121. Since one end of the second elastic member 7 is connected with the second moving iron 5 and the other end is fixed with the shell 1, the attraction movement of the second moving iron 5 will compress the second elastic member 7, causing it to elastically deform, and the second elastic member 7 stores elastic potential energy during compression.

[0073] When the coil assembly 2 is in the de-energized state, the magnetic field disappears, and the second moving iron 5 is no longer attracted by the magnetic field. At this time, the second elastic member 7 stores elastic potential energy due to the previous compression, and under the action of the elastic potential energy, the second elastic member 7 begins to reset. During the reset process, the second elastic member 7 will generate an outward elastic force, pushing the second moving iron 5 away from the first end face 121, realizing the separation between the second moving iron 5 and the first end face 121.

[0074] The elastic force of the second elastic member 7 can quickly overcome the residual magnetic force and frictional force between the second moving iron 5 and the first end face 121, so that the second moving iron 5 quickly returns to the initial position. On the one hand, the compression and reset function of the second elastic member 7 enables the electromagnetic actuator to realize stable attraction and release actions in the energized and de-energized states, improving the control accuracy and response speed of the electromagnetic actuator. On the other hand, the presence of the second elastic member 7 can also play a buffering and damping role. During the attraction and separation of the second moving iron 5, the second elastic member 7 can absorb and release energy, reducing vibration and noise caused by movement impact, and prolonging the service life of the electromagnetic actuator.

[0075] Second example

[0076] As shown in Figures 1-3 , Figure 5 , the radial inner wall of the second moving iron 5 is provided with a first groove 51, and the second elastic member 7 is sleeved on the push rod 3. The first groove 51 is arranged to accommodate at least part of the structure of the second elastic member 7, further optimizing the structure and performance of the electromagnetic actuator. Among them, the first groove 51 has a first step surface 511 facing the first end face 121 and connected with the second elastic member 7, providing a fulcrum point for the pushing action of the second elastic member 7. The depth and width of the first groove 51 will be adjusted accordingly according to the size of the second elastic member 7 to ensure that the second elastic member 7 can be stably placed therein.

[0077] When the coil assembly 2 is in the energized state, the second moving iron 5 is attracted by the magnetic field and moves towards the first end face 121, and the second elastic member 7 is compressed. At this time, the second elastic member 7 will be completely embedded in the first groove 51.

[0078] On the one hand, the cooperation between the first groove 51 and the second elastic member 7 reduces the magnetic gap, improves the attraction efficiency and stability of the electromagnetic actuator, and enables the electromagnetic actuator to complete the attraction and release actions in a shorter time and respond faster. At the same time, reducing the magnetic gap also reduces the magnetic resistance of the magnetic circuit, reduces energy loss, and improves the energy utilization efficiency of the electromagnetic actuator.

[0079] On the other hand, the optimized moving-iron electromagnetic force driving characteristics ensure that the electromagnetic actuator can still work normally in the limit state, and improve the reliability and adaptability of the electromagnetic actuator. Whether in high temperature, high pressure, or high vibration and other harsh environments, the electromagnetic actuator can operate stably and reliably, meeting the needs of various complex working conditions.

[0080] For example, the first moving iron 4 and the second moving iron 5 can be driven to displace by electromagnetic force. On the premise of ensuring the axial action stroke of the push rod 3, by reasonably designing the structure and size of the first moving iron 4 and the second moving iron 5, and optimizing the parameters of the coil assembly 2, the magnetic gap can be reduced. The reduction of the magnetic gap helps to improve the performance of the electromagnetic actuator. The smaller the magnetic gap, the smaller the magnetic resistance of the magnetic circuit, and the less the magnetic field strength decays in the magnetic circuit, so that the second moving iron 5 can be subjected to stronger electromagnetic force, improving the attraction efficiency and stability of the electromagnetic actuator. Moreover, the reduction of the magnetic gap can also ensure that the electromagnetic force of the electromagnetic actuator can still overcome the spring force of the second elastic member 7 in the limit state, so as to ensure that the second moving iron 5 can be closely attracted to the first end face 121, and realize the stable work of the electromagnetic actuator.

[0081] In addition, in some embodiments, the first end face 121 of the housing 1 can also be provided with a first ring groove 1211, which is arranged to accommodate part of the structure of the second elastic member 7. The first ring groove 1211 and the first groove 51 jointly accommodate the second elastic member 7, and at the same time play a guiding role for the second elastic member 7, so as to avoid the inclination or displacement of the second elastic member 7.

[0082] In some example embodiments, as shown in Figures 1-3 , Figure 5 The first moving iron 4 is provided with a first channel 41, and the push rod 3 is movably arranged in the first channel 41.

[0083] The first channel 41 can avoid part of the structure of the push rod 3, so that part of the structure of the push rod 3 can be embedded into the first channel 41, increasing the contact area between the push rod 3 and the first moving iron 4. During the operation of the electromagnetic actuator, the push rod 3 needs to bear a large force from the first moving iron 4 to realize reciprocating motion. A larger contact area can effectively disperse the force and reduce local stress concentration, thereby improving the stability of the connection between the push rod 3 and the first moving iron 4 and reducing the risk of failure due to loose connection.

[0084] From the perspective of movement direction restriction, the first channel 41 plays a guiding role in the movement of the push rod 3. Since the push rod 3 can only move within the first channel 41, its movement trajectory is limited in the length direction of the first channel 41, effectively avoiding unstable conditions such as deviation and shaking of the push rod 3 during movement.

[0085] In this embodiment, as shown in Figures 1-3 , Figure 5 , the electromagnetic actuator further includes a guide sleeve 8, which is arranged on the second end face 141 of the shell 1 and is tightly connected with the shell 1. In order to realize the positioning installation of the guide sleeve 8, a through hole 142 is arranged on one side of the second end face 141 of the shell 1. The guide sleeve 8 is installed in the through hole 142 in a clamping manner, which has the advantages of simple installation and accurate positioning.

[0086] Among them, part of the structure of the guide sleeve 8 can extend to the outside of the shell 1, reducing the occupation of the guide sleeve 8 to the internal accommodation space 11 of the shell 1, providing more abundant installation and movement space for the coil assembly 2, the first moving iron 4 and the second moving iron 5 and other components, which is conducive to optimizing the overall space layout of the electromagnetic actuator and making its structure more compact and reasonable.

[0087] The guide sleeve 8 is provided with a guide groove 81, and the first moving iron 4 is movably arranged in the guide groove 81. On the one hand, it provides a guiding effect for the first moving iron 4. Under the action of the magnetic field, the first moving iron 4 needs to make linear motion in a specific direction, such as the length direction of the push rod 3, in the guide groove 81. The linear shape and smooth inner wall of the guide groove 81 can ensure the movement trajectory of the first moving iron 4 to be accurate and reliable, avoiding the performance degradation or failure of the electromagnetic actuator caused by movement deviation.

[0088] On the other hand, the guide groove 81 also forms a protection for the first moving iron 4. During the operation of the electromagnetic actuator, the first moving iron 4 may be disturbed by the external environment or collide with other components. The guide groove 81 can provide a relatively closed protection space for the first moving iron 4, reducing the influence of external factors on it and prolonging the service life of the first moving iron 4.

[0089] The outer diameter size of the guide sleeve 8 is consistent with the outer diameter size of the second moving iron 5, that is, the inner diameter size of the guide groove 81 is smaller than the outer diameter size of the second moving iron 5. When the coil assembly 2 is in a power-off state, the magnetic field disappears, the push rod 3 will return to its original position, and then drive the first moving iron 4 to move. Since the inner diameter size of the guide groove 81 is smaller than the outer diameter size of the second moving iron 5, when the first moving iron 4 moves to a certain position, the second moving iron 5 will be in contact with the guide sleeve 8. This contact prevents the further movement of the second moving iron 5, thereby ensuring that the second moving iron 5 and the first moving iron 4 can be reliably separated.

[0090] The guide sleeve 8 in the embodiment can provide reliable support and guide for the movement of the first moving iron 4, and ensure stable operation of the electromagnetic actuator under various working conditions. Meanwhile, the protection of the guide sleeve 8 to the first moving iron 4 and the size matching design with the second moving iron 5 further prolong the service life of the electromagnetic actuator and improve its performance index.

[0091] In some example embodiments, as shown in Figures 1-3 、 Figure 5 The first elastic member 6 can be directly connected with the second moving iron 5 or indirectly connected. For example, when indirectly connected, the radial outer wall of the push rod 3 is provided with a stop table 31. One end of the first elastic member 6 is abutted to the second moving iron 5, and the other end is abutted to the stop table 31.

[0092] The stop table 31 can be circular, square or annular, etc., and the specific shape is subject to actual conditions, so as to ensure that the stop table 31 can shield the first elastic member 6, and the radial dimension of the stop table 31 is designed by referring to the structure of the second moving iron 5, so as to avoid interference between the stop table 31 and the second moving iron 5, and ensure that the stop table 31 can move along the length direction of the push rod 3.

[0093] The axial thickness of the stop table 31 needs to be determined according to the compression amount of the first elastic member 6 and the working requirements of the electromagnetic actuator. The stop table 31 needs to have sufficient thickness to withstand the elastic force of the first elastic member 6, so as to avoid deformation or damage in the long-term use. Meanwhile, the area of the stop table 31 also needs to be large enough, so as to ensure that the first elastic member 6 can uniformly exert the elastic force, and the movement of the push rod 3 is more stable.

[0094] When the coil assembly 2 is in the energized state, according to the principle of electromagnetic induction, a strong magnetic field will be generated around the coil assembly 2. Under the action of this magnetic field, the second moving iron 5 and the first moving iron 4 will be attracted to each other. After the first moving iron 4 is attracted, it will drive the push rod 3 to move along the length direction. The first elastic member 6 is clamped between the stop table 31 and the second moving iron 5, and the movement of the push rod 3 will compress the first elastic member 6.

[0095] When the coil assembly 2 is in the de-energized state, the magnetic field disappears, and the attraction force between the second moving iron 5 and the first moving iron 4 disappears. At this time, the first elastic member 6 stores elastic potential energy due to the previous compression, and under the action of the elastic potential energy, the first elastic member 6 begins to reset. When the first elastic member 6 resets, it will drive the stop table 31 to move, and the stop table 31 is connected with the push rod 3, so it will drive the push rod 3 to move in the reverse direction along the length direction. The movement of the push rod 3 will also drive the first moving iron 4 to move away from the second moving iron 5, so that the electromagnetic actuator returns to the initial state.

[0096] The push rod 3 in the embodiment has a radial outer wall provided with a stop 31, and the first elastic member 6 is clamped between the stop 31 and the second moving iron 5, which helps to optimize the overall structure of the electromagnetic actuator and make it more compact.

[0097] In the embodiment, as shown in Figures 1-4 The second moving iron 5 is provided with a second groove 52 configured to accommodate the first elastic member 6, and the first elastic member 6 is sleeved on the push rod 3.

[0098] The second groove 52 provides stable support and guidance for the compression of the first elastic member 6. During the compression process, the first elastic member 6 always remains in the second groove 52 and does not deviate or twist, ensuring that the first elastic member 6 is uniformly stressed and can stably store elastic potential energy. The second groove 52 has a second step surface 521 facing the second end surface 141 and connected with the first elastic member 6, so that the first elastic member 6 is clamped between the second step surface 521 and the stop 31. The stop 31 can also be accommodated into the second groove 52, reducing the requirement for additional installation space and improving the space utilization of the electromagnetic actuator, so that the electromagnetic actuator can realize more complex functions in a smaller volume.

[0099] The second groove 52 plays a role in guiding the resetting direction of the first elastic member 6 during this process. Since the first elastic member 6 is always accommodated in the second groove 52, its resetting direction can be consistent with the movement direction of the second moving iron 5 and the movement direction of the push rod 3, ensuring that the second moving iron 5 and the push rod 3 can smoothly and accurately return to the initial position.

[0100] When the coil assembly 2 is in an energized state, a magnetic field will be generated around the coil assembly 2 according to the principle of electromagnetic induction. Under the action of this magnetic field, the first moving iron 4 will be attracted and attracted to the second moving iron 5. At this time, the movement of the first moving iron 4 will drive the push rod 3 to move along its length direction until the first moving iron 4 is tightly connected with the second moving iron 5, and the first elastic member 6 will be deformed, i.e. compressed, and store elastic potential energy.

[0101] When the coil assembly 2 is in a de-energized state, the magnetic field disappears, and neither the second moving iron 5 nor the first moving iron 4 is attracted by the magnetic field. At this time, the first elastic member 6 stores elastic potential energy due to being compressed before, and under the action of the elastic potential energy, the first elastic member 6 begins to reset. During the resetting process, the first elastic member 6 will generate a backward pushing force to push the push rod 3 and the second moving iron 5 to move in the opposite direction.

[0102] The reset of the first elastic member 6 further improves the release speed and response sensitivity of the electromagnetic actuator in combination with the reset of the second elastic member 7. The second elastic member 7 is used to separate the second moving iron 5 from the first end face 121, and the first elastic member 6 is used to separate the second moving iron 5 from the first moving iron 4. The two work together to quickly cut off the brake passage, thereby improving the response speed and safety of the automobile brake parking mechanism. Through the cooperation of the second elastic member 7 and the first elastic member 6, the electromagnetic actuator can complete the attraction and release actions in a shorter time, and the action process is more stable, reducing the errors caused by vibration and impact, and improving the working performance and reliability of the electromagnetic actuator.

[0103] By accommodating the first elastic member 6 and the blocking table 31 in the second groove 52 on the second moving iron 5, the additional installation space requirement is reduced, the space utilization of the electromagnetic actuator is improved, and the electromagnetic actuator can realize more complex functions in a smaller volume.

[0104] In some example embodiments, as shown in Figure 6 The movement direction in this embodiment is different from the previous embodiments, for example, the second moving iron 5 is located on the side of the first moving iron 4 close to the first end face 121, and the second moving iron 5 is connected with the push rod 3. The first moving iron 4 and the second moving iron 5 are configured to move along the side close to the second end face 141 of the housing 1 under the energized state of the coil assembly 2 and drive the push rod 3 to retract into the first end face 121. The overall structure and arrangement are basically the same as those in the previous embodiments, except that the driving direction and principle are different.

[0105] When the coil assembly 2 is in the energized state, a magnetic field will be generated around the coil assembly 2 according to the principle of electromagnetic induction. Under the action of this magnetic field, the first moving iron 4 will be attracted and attracted to the second moving iron 5. At this time, the movement of the first moving iron 4 will drive the push rod 3 to move along its length direction towards the second end face 141 until the first moving iron 4 is tightly connected with the second moving iron 5, and the push rod 3 retracts into the first end face 121. At the same time, the first elastic member 6 will be deformed, i.e. the first elastic member 6 is compressed and stores elastic potential energy.

[0106] When the coil assembly 2 is in the de-energized state, the magnetic field disappears, and neither the second moving iron 5 nor the first moving iron 4 is attracted by the magnetic field. At this time, the first elastic member 6 stores elastic potential energy due to being compressed before, and under the action of the elastic potential energy, the first elastic member 6 begins to reset. During the reset process, the first elastic member 6 will generate a backward thrust to push the push rod 3 and the second moving iron 5 to move in the opposite direction, thereby driving the push rod 3 to extend out of the first end face 121.

[0107] In this embodiment, as shown in Figures 1-4As shown, the electromagnetic actuator further comprises a second elastic member 7 arranged between the first moving iron 4 and the second end face 141, and the second elastic member 7 is configured to push the first moving iron 4 to move away from the second end face 141. When the coil assembly 2 is in the energized state, the first moving iron 4 is attracted to the second moving iron 5, and the second moving iron 5 is attracted to the second end face 141. At this time, the first elastic member 6 and the second elastic member 7 are both compressed to store elastic potential energy. When the coil assembly 2 is in the de-energized state, the magnetic field disappears, the second elastic member 7 pushes the first moving iron 4 to move away from the second end face 141, and the first elastic member 6 pushes the second moving iron 5 to move away from the second end face 141, thereby driving the push rod 3 to extend out of the first end face 121.

[0108] The electromagnetic actuator in the present disclosure has flexible and various arrangement modes, and can meet different scene requirements. Meanwhile, as Figures 1-5 As shown, the push rod 3 can also penetrate through the second end face 141 of the housing 1, so that the other side of the push rod 3 can also be pushed or limited in movement, and the actual requirements can be specifically used as a reference.

[0109] In some example embodiments, as Figures 1-5 Figure 7 Figures 1-7 As shown, the electromagnetic actuator can be a single-stable actuator or a double-stable actuator, so as to meet different use scenes or use requirements and improve the flexibility and diversity of the electromagnetic actuator.

[0110] When the electromagnetic actuator is a single-stable actuator, the coil assembly 2 comprises a group of coils. It does not need to be provided with a permanent magnet, so that the arrangement space of the coil assembly 2 is more concentrated. Compared with the double-stable electromagnetic actuator in the related art which needs to be provided with more permanent magnets and needs a larger space for arranging the winding, the single-stable electromagnetic actuator is more conducive to realizing miniaturization and integration design, can better adapt to the wheel space of a vehicle, and meets the development trend of miniaturization of an automotive electronic mechanical brake device.

[0111] When the electromagnetic actuator is a double-stable actuator, the coil assembly 2 comprises a first group of coils 22 and a second group of coils 23, and the first group of coils 22 and the second group of coils 23 are arranged on two sides along the length direction of the push rod 3. The arrangement mode is more flexible, and the double-stable actuator can be used to control the movement direction of two-stage moving irons, for example, forward and reverse current control to drive forward and backward actions, so as to meet different control requirements.

[0112] The electromagnetic actuator in the present disclosure adopts a double-stage moving iron structure, such as the first moving iron 4 and the second moving iron 5, and buffers the impact noise through the stepped arrangement of the spring, such as the second elastic member 7 and the first elastic member 6, effectively reduces the impact noise, and the durability of the spring is more reliable than that of the elastic body, not only solving the noise problem, but also improving the reliability of the system. And the second elastic member 7 and the first elastic member 6 work together to further improve the release speed and response sensitivity of the electromagnetic actuator, quickly cut off the brake path, improve the response speed and safety of the automobile brake parking mechanism, and reduce the demand for additional installation space, improve the space utilization rate.

[0113] By reasonably designing the structure and size of the first moving iron 4 and the second moving iron 5, and optimizing the parameters of the coil assembly 2, the magnetic gap is reduced under the premise of ensuring the axial action stroke of the push rod 3. The reduction of the magnetic gap improves the attraction efficiency and stability of the electromagnetic actuator, makes the response speed of the electromagnetic actuator faster, reduces the magnetic resistance of the magnetic circuit, reduces energy loss, and improves energy utilization efficiency. At the same time, the optimized moving iron electromagnetic force driving characteristic ensures that the electromagnetic actuator can still work normally in the limit state, improves the reliability and adaptability, and meets the demand of various complex working conditions.

[0114] The present disclosure also provides a brake parking mechanism, which comprises a body (not shown in the figure), a locking mechanism 9 and an electromagnetic actuator, the locking mechanism 9 and the electromagnetic actuator are arranged in the body, and each part works together to realize the brake parking function.

[0115] The electromagnetic actuator comprises a shell 1, a push rod 3, a coil assembly 2, a first moving iron 4 and a second moving iron 5, which are arranged in the same way as in any of the above embodiments, and will not be repeated here.

[0116] The locking mechanism 9 comprises a locking pawl 91 and a locking ratchet 92, both of which are rotatably arranged in the body, so that the locking pawl 91 and the locking ratchet 92 can move relatively under the action of the push rod 3, thereby completing the locking and unlocking operation.

[0117] The locking ratchet 92 can be designed to have a clamping groove structure, and when the other end of the locking pawl 91 is clamped into the clamping groove, the locking function is realized. The rotation angle and range of the locking ratchet 92 can be designed according to actual use requirements to ensure the reliability and flexibility of the locking and unlocking operation.

[0118] The locking ratchet 92 is connected with a driving unit in the brake parking mechanism. The driving unit, for example, comprises a driving motor, the driving shaft of the driving motor is connected with the locking ratchet 92, and the locking ratchet 92 can be driven to move around the shaft by the driving motor.

[0119] The locking ratchet 92 is usually made of high-strength metal material to ensure that it will not be deformed or damaged when bearing a large torque. The shape and size of the teeth of the locking ratchet 92 are designed according to the matching requirements with the locking pawl 91, for example, the teeth are triangular or trapezoidal, etc., to ensure that the locking ratchet 92 can stably interact with the locking pawl 91 during locking and unlocking.

[0120] The shape and structure of the locking pawl 91 are designed according to the matching requirements with the push rod 3 and the locking ratchet 92. For example, the locking pawl 91 can be designed as a lever structure, which is rotatably installed on the body through a rotating connecting piece such as a pin shaft. One end of the locking pawl 91 abuts against the push rod 3, and the other end is used for clamping and matching with the locking ratchet 92.

[0121] The locking pawl 91 is generally made of metal material, and its shape is designed to meet the requirement of forming effective clamping with the locking ratchet 92. For example, the end of the locking pawl 91 in contact with the locking ratchet 92 can be designed to have a shape matching the teeth of the locking ratchet 92, so that it can be firmly clamped into the teeth during locking, preventing the locking ratchet 92 from rotating in the opposite direction.

[0122] The locking mechanism 9 further includes an elastic reset member 93 and a first shaft body 94. The locking pawl 91 is rotatably arranged on the body, for example, the locking pawl 91 is arranged on the body through the first shaft body 94, and the locking pawl 91 can rotate around the first shaft body 94.

[0123] The elastic reset member 93 is connected with the body and the locking pawl 91 respectively, and is used to restore the locking pawl 91 to the initial position during unlocking. For example, the elastic reset member 93 includes a tension spring 931, a second shaft body 932, and a third shaft body 933. The second shaft body 932 is fixedly connected with the body, the third shaft body 933 is fixedly connected with the locking pawl 91, and both ends of the tension spring 931 are provided with a hook 9311, which is hung on the corresponding second shaft body 932 and third shaft body 933 respectively.

[0124] In order to improve the stability of the elastic reset member 93, a baffle 9321 is arranged on the second shaft body 932, and the radial dimension of the second shaft body 932 is smaller than the dimension of the baffle 9321, so that the baffle 9321 can shield the hook 9311 to prevent the hook 9311 from falling off.

[0125] In addition, the second shaft body 932 is located on the side of the locking pawl 91 close to the locking ratchet 92, and such a layout enables the tension spring 931 to pull the locking pawl 91 to rotate around the first shaft body 94 during contact locking, so as to promote the locking pawl 91 to separate from the locking ratchet 92.

[0126] It can be understood that, in addition to the second shaft body 932 being provided with the shielding structure, the first shaft body 94 and the third shaft body 933 can also be provided with similar structures to achieve corresponding shielding, depending on the actual situation.

[0127] When the brake parking function needs to be implemented, the coil assembly 2 in the electromagnetic actuator is powered on, so that the coil assembly 2 is in a powered-on state. At this time, the coil assembly 2 generates a magnetic field, the second moving iron 5 is attracted to the first end surface 121 under the action of the magnetic field, the first moving iron 4 is attracted to the second moving iron 5, and then drives the push rod 3 to move along its length direction. The push rod 3 is arranged to abut against one end of the locking pawl 91, and drives the locking pawl 91 to rotate around the first shaft body 94. The other end structure of the locking pawl 91 is matched with the locking ratchet wheel 92, so that the other end of the locking pawl 91 is clamped with the locking ratchet wheel 92, thereby forming a lock between the two. In this process, the elastic return member 93 is deformed, that is, the tension spring 931 is stretched, and then stores elastic potential energy. The clamping of the locking pawl 91 and the locking ratchet wheel 92 prevents the rotation of the locking ratchet wheel 92, and since the locking ratchet wheel 92 is connected with the driving unit, the brake parking function is realized.

[0128] Whether the brake parking is released is optional. If it is not needed to be released, the clamping between the locking pawl 91 and the locking ratchet wheel 92 is maintained. If the brake parking needs to be released, the coil assembly 2 in the electromagnetic actuator is powered off, and the push rod 3 retreats from the locking pawl 91. At this time, the driving motor can be used to drive the locking ratchet wheel 92 to rotate around its axis, and in the process of rotation, the locking state of the locking ratchet wheel 92 and the locking pawl 91 is released. Since both ends of the locking pawl 91 are in a free state, the elastic return member 93 begins to reset, that is, the tension spring 931 contracts, drives the locking pawl 91 to rotate reversely around the first shaft body 94, so that the locking pawl 91 is separated from the locking ratchet wheel 92, and the brake parking function is released.

[0129] The brake parking mechanism in the embodiment controls the movement of the push rod 3 through the electromagnetic actuator, and then drives the clamping and separation of the locking pawl 91 and the locking ratchet wheel 92, and realizes automatic reset in combination with the elastic return member 93. The structure is simple and reliable, and can effectively realize the locking and unlocking functions of the brake parking, and meet the needs of users.

[0130] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0131] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electromagnetic actuator, characterized by The electromagnetic actuator comprises: a housing having a first end face and a second end face arranged oppositely; a coil assembly arranged in the housing, an accommodation channel being arranged in the coil assembly; a push rod movably arranged in the accommodation channel, an end of the push rod penetrating the first end face along a length direction of the push rod; a first moving iron and a second moving iron movably arranged in the accommodation channel and arranged along the length direction of the push rod, one of the first moving iron and the second moving iron being connected to the push rod, the first moving iron and the second moving iron being configured to move along the length direction of the push rod under the energized state of the coil assembly and drive the push rod to move; and a first elastic member connected to the first moving iron and the second moving iron, the first elastic member being configured to push the first moving iron and the second moving iron to move away from each other.

2. An electromagnetic actuator according to claim 1, characterised in that, The first moving iron is located on a side of the second moving iron away from the first end face. The first moving iron is connected to the push rod, and the first moving iron and the second moving iron are configured to move along a side close to the first end face under the energized state of the coil assembly and drive the push rod to extend out of the first end face.

3. An electromagnetic actuator according to claim 2, characterised in that, The electromagnetic actuator further comprises a second elastic member arranged between the second moving iron and the first end face, the second elastic member being configured to push the second moving iron to move away from the first end face.

4. An electromagnetic actuator according to claim 3, characterised in that, A first groove is arranged on a radial inner wall of the second moving iron. The second elastic member is sleeved on the push rod, and at least part of a structure of the second elastic member extends into the first groove; wherein the first groove has a first step face facing the first end face and connected to the second elastic member.

5. The electromagnetic actuator of claim 2, wherein, An end of the first moving iron close to the second end face of the housing is fixedly connected to the push rod.

6. An electromagnetic actuator according to claim 5, characterised in that, One end of the first elastic member abuts against the first moving iron, and the other end abuts against the second moving iron.

7. The electromagnetic actuator of claim 2, wherein, A first channel is arranged on the first moving iron, and the push rod is movably arranged in the first channel.

8. An electromagnetic actuator according to claim 2 or 5 or 7, characterised in that, A stop is arranged on the push rod, one end of the first elastic member abuts against the second moving iron, and the other end abuts against the stop.

9. The electromagnetic actuator of claim 1, wherein, The second moving iron is located on a side of the first moving iron close to the first end face, the second moving iron is connected to the push rod, and the first moving iron and the second moving iron are configured to move along a side close to the second end face of the housing under the energized state of the coil assembly and drive the push rod to retract into the first end face.

10. An electromagnetic actuator according to claim 9, characterised in that, The electromagnetic actuator further comprises a second elastic member arranged between the first moving iron and the second end face, the second elastic member being configured to push the first moving iron to move away from the second end face.

11. An electromagnetic actuator according to claim 2 or 9, characterised in that, The push rod further penetrates the second end face of the housing.

12. The electromagnetic actuator of claim 1, wherein, The second moving iron is provided with a second groove; The first elastic member is sleeved on the push rod, and at least part of a structure of the first elastic member extends into the second groove; wherein the second groove has a second step face facing the second end face and connected to the first elastic member.

13. The electromagnetic actuator of claim 1, wherein, The electromagnetic actuator is a monostable actuator, and the coil assembly comprises a group of coils.

14. The electromagnetic actuator of claim 1, wherein, The electromagnetic actuator is a bistable actuator, the coil assembly comprises a first set of coils and a second set of coils, the first set of coils and the second set of coils are arranged on two sides along the length direction of the push rod.

15. A brake hold mechanism characterized by, The electromagnetic actuator comprises a body, a locking mechanism and a locking ratchet and a locking pawl, the locking pawl is configured to be clamped on the locking ratchet in the extended or retracted state of the push rod of the electromagnetic actuator.

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