Parking device, electronic mechanical braking system and vehicle

Abstract

The utility model discloses a parking device, an electronic mechanical braking system and a vehicle, the parking device can be switched between a locking state and an unlocking state, the parking device comprises a ratchet wheel which can rotate forwards or reversely so as to be switched between a locking position and an unlocking position, and the ratchet wheel comprises ratchets; the pawl comprises a locking part and a contact part which are connected; one end of the first elastic reset piece abuts against the contact part; the electromagnetic actuator comprises a push rod and a magnetic conductive shell, and the push rod movably penetrates through the magnetic conductive shell; the electromagnetic actuator is powered on, the push rod penetrates out of the magnetic conductive shell to press the contact part, the first elastic reset piece is in a compressed state, the locking part abuts against the ratchet, the ratchet wheel rotates reversely to the locking position, and the parking device is switched to the locking state; in the locking state, the electromagnetic actuator loses power and is kept; when the ratchet wheel rotates forwards to the unlocking position, the first elastic reset piece enables the pawl to be separated from the ratchet wheel, the locking part does not abut against the ratchet, and the parking device is switched to the unlocking state. The cost of the parking device can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle braking technical field, especially relates to a parking device, electronic mechanical brake system and vehicle. BACKGROUND

[0002] With the continuous development of automobile technology, the braking system of the automobile is also constantly progressing. Compared with the traditional hydraulic brake system, the electronic mechanical brake system (EMB) has higher response speed and more precise control ability, and can realize more efficient energy recovery and more optimized braking performance.

[0003] The parking device in the prior art usually needs to set a position sensor on a double-acting self-holding electromagnet to detect the position of the push rod of the electromagnet, and needs to apply different direction currents to the coil of the electromagnet to push and pull the push rod, and cooperate with the position sensor to jointly realize the locking or unlocking of the ratchet, so that the control precision of the electromagnet is required to be higher, the control circuit is more complex, and more parts are used, so that the cost of the parking device is higher. SUMMARY

[0004] The utility model discloses a parking device, need not set position sensor, also need not apply different direction currents to the coil of the electromagnetic actuator, can reduce the use of parts, effectively reduce the cost of parking device.

[0005] To solve the above technical problems, the embodiment of the utility model discloses a parking device, can switch between locking state and unlocking state, the parking device includes:

[0006] The ratchet is used to be connected with the driving part of the electronic mechanical brake system and can be switched between the locking position and the unlocking position by forward rotation or reverse rotation, and the ratchet includes a ratchet tooth;

[0007] The pawl includes a locking part and a contact part, the locking part and the contact part are connected, and the locking part can abut against the ratchet tooth;

[0008] The first elastic return member has one end abutting against the contact part and can be switched between the compressed state and the uncompressed state;

[0009] The electromagnetic actuator includes a push rod and a magnetic guide shell, the push rod is movably arranged in the magnetic guide shell, and the push rod is arranged above the contact part;

[0010] The electromagnetic actuator is powered on, the push rod penetrates through the magnetically conductive shell and presses the contact portion, the first elastic reset member is in a compressed state, the locking portion abuts against the ratchet tooth, the ratchet wheel is reversely rotated to the locking position, the parking device is switched to the locking state, and the electromagnetic actuator is powered off.

[0011] When the parking device needs to be parked, the electromagnetic actuator is powered on, the push rod penetrates through the magnetically conductive shell and presses the contact portion, the first elastic reset member is in a compressed state, the locking portion abuts against the ratchet tooth, the ratchet wheel is reversely rotated to the locking position, the parking device is switched to the locking state, and the electromagnetic actuator is powered off.

[0012] Therefore, the electromagnetic actuator only needs to be powered on when the parking device is switched to the locking state, and the electromagnetic actuator can be kept in a powered-off state after the parking device is switched to the locking state, so that, compared with a double-acting self-holding electromagnetic iron, the electromagnetic actuator does not need to be applied with electric currents in different directions, and therefore, a special H-bridge circuit or the like for realizing the commutation of the electric currents is not needed, and a position sensor for detecting the position of the push rod is not needed to be arranged on the electromagnetic actuator, so that the number of mechanism parts can be reduced, and the cost of the parking device can be effectively reduced.

[0013] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a parking device, the push rod is movably arranged in the magnetically conductive shell along a first direction, and the contact portion comprises an inclined surface.

[0014] According to the above technical scheme, after the electromagnetic actuator is powered on, the push rod penetrates through the magnetically conductive shell along the first direction, the push rod slides on the inclined surface and presses the inclined surface, so as to drive the locking portion to abut against the ratchet tooth along the second direction, and at this time, the push rod of the electromagnetic actuator is parallel to the axial direction of the ratchet wheel, the displacement of the push rod in the horizontal direction can be converted into the displacement of the locking portion in the vertical direction, and the parking device can be arranged flexibly in the vehicle.

[0015] According to another specific embodiment of the utility model, the utility model discloses an embodiment of the utility model discloses a parking device, the push rod is movably arranged in the magnetic shell along the second direction, when the electromagnetic actuator is powered on, along the second direction, the push rod presses down the contact part, drives the locking part and abuts on the ratchet wheel along the second direction.

[0016] Adopt above-mentioned technical scheme, after the electromagnetic actuator is powered on, the push rod stretches out the magnetic shell along the second direction, and the push rod presses down the contact part to drive the locking part and abut on the ratchet wheel along the second direction, at this time, the push rod of electromagnetic actuator is perpendicular to the axial direction of ratchet wheel, and the parking device arranged in the vehicle can be arranged flexibly.

[0017] According to another specific embodiment of the utility model, the utility model discloses an embodiment of the utility model discloses a parking device, the electromagnetic actuator includes push head, and the push head is arranged at one end of the push rod, and the push head is connected with the contact part.

[0018] Adopt above-mentioned technical scheme, after the push rod stretches out the magnetic shell after being powered on, even if being in the power-off state, will not retract the magnetic shell, and the push rod can move along with the movement of the contact part, when the parking device switches to different states, the movement of the contact part drives the movement of the push rod, and the movement of the push rod can cause the change of inductance in the electromagnetic actuator, which can be used to detect the position of the push rod.

[0019] According to another specific embodiment of the utility model, the utility model discloses an embodiment of the utility model discloses a parking device, the pawl includes a connecting portion, the first elastic return member includes a first end and a second end, the first end is arranged on the connecting portion, and the second end is arranged below the contact part, when the push rod presses down the contact part by penetrating out of the magnetic shell, the second end is pressed and is in a compressed state, when the ratchet wheel is positively rotated to the unlocking position, the second end rebounds to the non-pressing state.

[0020] Adopt above-mentioned technical scheme, the first end of the first elastic return member is arranged on the connecting portion, and the second end is arranged below the contact part, when the electromagnetic actuator is powered on, the push rod presses down the contact part, the contact part moves downward and presses the second end, so that the first elastic return member is in a compressed state. When the ratchet wheel is positively rotated to the unlocking position, the locking part and the ratchet wheel have the tendency of not contacting, until the self-locking force between the locking part and the ratchet wheel is less than the rebound force of the second elastic return member, under the rebound force of the second elastic return member, the contact part drives the locking part to move upward, so that the locking part completely separates from the ratchet wheel, therefore, without the participation of the electromagnetic actuator, the parking device can be switched to the unlocking state, which can further reduce the cost, avoid the situation that the parking device cannot be switched to the unlocking state due to the failure of the electromagnetic actuator, and make the parking device have better stability.

[0021] According to another specific embodiment of the utility model, the utility model discloses an implementation mode of a parking device, which comprises a fixed part, a locking part and a contact part, one end of the connecting part is provided with the locking part and the contact part, the other end of the connecting part is provided with the fixed part, the fixed part comprises a mounting groove, the first elastic reset piece is arranged in the mounting groove, the first end is connected with the groove wall of the mounting groove, and the second end is arranged below the contact part and extends out of the mounting groove.

[0022] According to another specific embodiment of the utility model, the utility model discloses an implementation mode of a parking device, which comprises a fixed part, a locking part and a contact part, one end of the connecting part is provided with the locking part and the contact part, the other end of the connecting part is provided with the fixed part, the fixed part comprises a mounting groove, the first elastic reset piece is arranged in the mounting groove, the first end is connected with the groove wall of the mounting groove, and the second end is arranged below the contact part and extends out of the mounting groove.

[0023] The above technical scheme is adopted, the shaft is abutted to the shell of the electronic mechanical brake system through the snap spring, when one end of the pawl is pressed down, the other end drives the shaft to rotate, the snap spring is pressed, when one end of the pawl returns to the original position, the snap spring can also provide partial elastic force, and the locking part is moved away from the ratchet by the first elastic reset piece.

[0024] According to another specific embodiment of the utility model, the utility model discloses an implementation mode of a parking device, which comprises a fixed part, a locking part and a contact part, one end of the connecting part is provided with the locking part and the contact part, the other end of the connecting part is provided with the fixed part, the fixed part comprises a mounting groove, the first elastic reset piece is arranged in the mounting groove, the first end is connected with the groove wall of the mounting groove, and the second end is arranged below the contact part and extends out of the mounting groove.

[0025] The above technical scheme is adopted, when the parking device is switched to the locking state, the electromagnetic actuator is de-energized, the second elastic reset piece returns to the non-pressing state, the push rod can retract into the magnetic shell, the contact part can be prevented from moving upward and colliding with the push rod when the parking device is switched to the unlocking state, and the electromagnetic actuator can be protected.

[0026] According to another specific embodiment of the utility model, the utility model discloses an implementation mode of a parking device, which comprises a fixed part, a locking part and a contact part, one end of the connecting part is provided with the locking part and the contact part, the other end of the connecting part is provided with the fixed part, the fixed part comprises a mounting groove, the first elastic reset piece is arranged in the mounting groove, the first end is connected with the groove wall of the mounting groove, and the second end is arranged below the contact part and extends out of the mounting groove.

[0027] The shell is connected with the other end of the shaft of the parking device.

[0028] The driving part is connected with the ratchet of the parking device and is used for driving the ratchet to be switched between the reverse rotation state and the forward rotation state.

[0029] According to another specific embodiment of the present application, the embodiment of the present application discloses a vehicle comprising the electromechanical brake system in the foregoing embodiment. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A schematic diagram of an electromagnet structure in some embodiments is shown.

[0031] Figure 2 A schematic diagram of the control principle of an electromagnet in some embodiments is shown.

[0032] Figure 3 A schematic diagram of the current flowing in the H-bridge circuit of an electromagnet in some embodiments is shown.

[0033] Figure 4 A schematic diagram of the current flowing in the H-bridge circuit of an electromagnet in some embodiments is shown.

[0034] Figure 5 A schematic diagram of an electromechanical brake system provided by the embodiment of the present application is shown.

[0035] Figure 6 A three-dimensional schematic diagram of the parking device in the locked state provided by the embodiment of the present application is shown.

[0036] Figure 6a A three-dimensional schematic diagram of the parking device in the locked state provided by the embodiment of the present application is shown.

[0037] Figure 7 A three-dimensional schematic diagram of the parking device in the unlocked state provided by the embodiment of the present application is shown.

[0038] Figure 8 A three-dimensional schematic diagram of the electromagnet of the parking device provided by the embodiment of the present application is shown.

[0039] Figure 9 A schematic diagram of the internal structure of the electromagnet of the parking device provided by the embodiment of the present application is shown.

[0040] Figure 10 A schematic diagram of the control principle of the electromagnet of the parking device provided by the embodiment of the present application is shown.

[0041] Figure 11 A three-dimensional schematic diagram of the ratchet and the ratchet wheel of the parking device provided by the embodiment of the present application is shown.

[0042] Figure 12 A schematic diagram of the horizontal arrangement of the electromagnet of the parking device provided by the embodiment of the present application is shown.

[0043] Figure 13A scheme diagram of the vertical arrangement of the electromagnetic actuator of the parking device provided by the embodiment of the application is shown. DETAILED DESCRIPTION

[0044] The other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the description. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0045] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0046] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0047] The terms "first", "second", and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present embodiment, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; 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, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0049] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail in combination with the drawings.

[0050] In some embodiments, referring to Figure 1 , Figure 2 , the electromagnet for the electromechanical brake system comprises an electromagnet mechanism 100 and a position sensor 200, wherein the electromagnet mechanism 100 is composed of a permanent magnet 110, a first electromagnetic coil 120, a second electromagnetic coil 130, a metal magnetic conductive shell 140, a metal magnetic conductive core 150, a metal non-magnetic conductive push rod 160, etc., the first electromagnetic coil 120 and the second electromagnetic coil 130 are connected in series, have the same winding direction, and control the movement of the inner magnetic core by adopting the method of passing positive and negative direction current.

[0051] Therefore, as shown in Figure 2 , it is necessary to build an H-bridge commutation circuit between the control part of the electromechanical brake system and the electromagnet to realize the commutation of the current, and the hardware cost and control cost are relatively high. For example, as shown in the H-bridge commutation circuit diagram of Figure 3 , Figure 4 , the H-bridge circuit at least needs Q1, Q2, Q3, and Q4 four switching tubes to be composed, when the current flows from the power supply along the arrow a through Q1, the electromagnet, and Q4 in turn, the current flows in the positive direction; when the current flows from the power supply along the arrow b through Q2, the electromagnet, and Q3 in turn, the current flows in the reverse direction.

[0052] Referring to Figure 1 , the position sensor 200 comprises components such as a sensor chip, and the position sensor is built in the metal magnetic conductive shell 140 of the electromagnet mechanism 100 by using the Hall principle, the structure of the position sensor 200 is complex, which further increases the cost of the electromechanical brake system, and in the working state of the electromagnet, the permanent magnet 110 magnetizes the metal magnetic conductive shell 140, which can attract the metal non-magnetic conductive push rod 160 by magnetic force when the metal non-magnetic conductive push rod 160 moves to the left and right ends, so as to achieve stable control during parking and driving. After the electromagnetic coil is energized, it needs to maintain a weak current, on the one hand, to prevent the metal non-magnetic conductive push rod 160 from being stuck in the absolute middle position due to strong vibration, and on the other hand, to facilitate the internal system logic detection and assist the secondary position sensor 200 in judging the position.

[0053] In addition, in some embodiments, when the electromechanical brake system needs to be unlocked, the metal non-magnetic conductive push rod 160 of the electromagnet needs to be kept in the state of extending out of the metal magnetic conductive shell 140, so as to push the pawl (not shown in the figure) of the electromechanical brake system and make it keep not abutting against the ratchet wheel (not shown in the figure) of the electromechanical brake system. In summary, the electromagnet in the electromechanical brake system needs to maintain the power-on state after being energized, and the corresponding structure design and control circuit design are relatively complex and have high cost.

[0054] Therefore, referring toFigure 5 The electronic mechanical brake system provided by the embodiments of the present application comprises a housing, a driving part and a parking device, and the driving part and the parking device are arranged in the housing. The housing is connected with one end of a rotating shaft 60 of the parking device, and the driving part is connected with a ratchet wheel (see Figure 6 ) of the parking device, and is used to drive the ratchet wheel to switch between the reverse rotation state and the forward rotation state. Exemplarily, the driving part comprises a motor and a transmission mechanism, the transmission mechanism can reduce the output rotating speed of the motor while increasing the output torque transmitted to the parking device to realize the parking function. The transmission mechanism can adopt various transmission modes, such as a belt transmission mechanism, a worm transmission mechanism, a cylindrical gear transmission mechanism, a planetary gear transmission mechanism, etc., and the embodiments of the present application do not limit the transmission mechanism.

[0055] In some embodiments, referring to Figure 6 , Figure 7 The embodiments of the present application provide a parking device which can switch between the locking state and the unlocking state. The parking device comprises a ratchet wheel 10, a pawl 20, a first elastic reset member 30 and an electromagnetic actuator 40. The ratchet wheel 10 comprises a plurality of ratchet teeth 11 and a connecting hole 12. The plurality of ratchet teeth 11 are arranged along the circumference of the ratchet wheel 10 and are spaced from the connecting hole 12. The connecting hole 12 is used to be connected with an output shaft (not shown in the figure) of a driving part of an electronic mechanical brake system. The driving part can drive the output shaft to rotate, so that the ratchet wheel 10 rotates in the forward direction or the reverse direction, to make the ratchet wheel 10 switch between the locking position and the unlocking position. Exemplarily, the ratchet wheel 10 rotates in the reverse direction Q to the locking position, so that the ratchet wheel 10 has a locking load. The ratchet wheel 10 rotates in the forward direction E to the unlocking position, to release the locking load.

[0056] Exemplarily, the pawl 20 comprises a locking part 21 and a contact part 22, and the locking part 21 and the contact part 22 are connected. The locking part 21 can abut against the ratchet tooth 11. Exemplarily, the ratchet wheel 10 comprises 23 ratchet teeth 11 which are arranged at intervals. The locking space 111 is formed between two adjacent ratchet teeth 11. In the locking state, the locking part 21 can be inserted into the locking space 111 and abut against the ratchet tooth 11. At this time, the locking part 21 and the ratchet tooth 11 form a self-locking state. Under the action of the locking load and the self-locking state, the parking device can reliably be in the locking state.

[0057] Exemplarily, each ratchet 11 corresponds to a locking load of 0.5 KN, when the ratchet wheel 10 reverses one circle along the reverse direction Q, i.e. the ratchet wheel 10 rotates 23 teeth along the reverse direction Q, at this time the ratchet wheel 10 has a locking load of 0.5 (KN) x 23 (teeth) = 11.5 KN, it can be understood that the number of ratchets 11 and the size of the locking load are not limited in the embodiments of the present application, for example, the number of ratchets 11 can be 18, 20, 21, 22, 25, 26, 30, etc., and the ratchet wheel 10 can also be reversed 2 circles, 3 circles, etc. along the reverse direction Q according to needs.

[0058] In some embodiments, for example, when the preset load is 11.5 KN, the driving part of the electromechanical brake system is used to drive the ratchet wheel 10 to rotate one circle + 2 teeth, i.e. the ratchet wheel 10 rotates 25 teeth along the reverse direction Q, at this time the locking load of the ratchet wheel 10 is 12.5 KN, by increasing the redundancy value of the locking load, the better reliability of the parking device is further ensured.

[0059] Exemplarily, referring to Figure 6 , Figure 6a , Figure 7 , the electromagnetic actuator 40 includes a push rod 41 and a magnetic guide shell 42, the push rod 41 is movably arranged in the magnetic guide shell 42, and the push rod 41 is arranged above the contact part 22. When parking is needed, the ratchet wheel 10 is reversed to the locking position, the electromagnetic actuator 40 is powered on, the push rod 41 penetrates out of the magnetic guide shell 42 and presses down the contact part 22, the first elastic reset part 30 is in a compressed state, and the locking part 21 abuts against the ratchet 11, which is used to switch the parking device to the locking state (as shown in Figure 6 ), in the locking state, the electromagnetic actuator 40 is powered off. When driving is needed, the ratchet wheel 10 is rotated to the unlocking position, the first elastic reset part 30 rebounds to an uncompressed state, and the locking part 21 does not abut against the ratchet 11, which is used to switch the parking device to the unlocking state (as shown in Figure 7 ). Exemplarily, the magnetic guide shell 42 can use a magnetic ferrite type stainless steel (SUS410) material, and the push rod 41 uses a non-magnetic austenitic stainless steel (SUS303) material.

[0060] According to the technical scheme, when the parking device needs to be parked, the electromagnetic actuator 40 is powered on, the push rod 41 penetrates through the magnetic shell 42 and pushes the contact part 22 in the downward direction M, and the pushing force is applied to the contact part 22 in one direction. At this time, the locking part 21 abuts against the ratchet tooth 11, and the first elastic reset part 30 is in a compressed state, the ratchet wheel 10 is reversed to the locking position, and the parking device enters the locking state. By abutting the locking part 21 against the ratchet tooth 11, the ratchet wheel 10 is reliably locked. After confirming that the parking device is switched to the locking state, the electromagnetic actuator 40 can be powered off, and there is no need to keep it in the powered-on state. At this time, the electromagnetic actuator 40 no longer applies force to the pawl 20, and the ratchet wheel 10 and the pawl 20 are kept in the locking state under the action of the mechanical self-locking force. When the parking device needs to be driven, that is, when the unlocking action is performed, the ratchet wheel 10 is rotated to the unlocking position, the first elastic reset part 30 is rebounded to the uncompressed state along the rebound direction N, and under the rebounding force of the first elastic reset part 30, the pawl 20 is driven to disengage from the ratchet wheel 10, so that the locking part 21 does not abut against the ratchet tooth 11, thereby switching the parking device to the unlocking state.

[0061] Therefore, the electromagnetic actuator 40 only needs to be powered on when the parking device is switched to the locking state, and can be kept in the powered-off state after the parking device is switched to the locking state. Therefore, compared with the double-acting self-holding electromagnet, the electromagnetic actuator 40 does not need to apply different direction currents to the coil, and therefore does not need to design a special H-bridge circuit to realize the commutation of the current, and does not need to set a position sensor on the electromagnetic actuator 40 to detect the position of the push rod 41, thereby reducing the number of mechanism parts and effectively reducing the cost of the parking device.

[0062] In some embodiments, referring to Figure 7 、 Figure 8 、 Figure 9 The electromagnetic actuator 40 includes a second elastic reset part 43 and a coil 44. The second elastic reset part 43 is arranged at the other end of the push rod 41 away from the contact part 22. When the electromagnetic actuator 40 is powered on, the second elastic reset part 43 is in a compressed state. When the electromagnetic actuator 40 is powered off, the second elastic reset part 43 rebounds to an uncompressed state, so as to retract the push rod 41 into the magnetic shell 42.

[0063] Exemplarily, the magnetic conductive shell 42 comprises a top wall 421, a bottom wall 422 and a side wall 423, the top wall 421, the bottom wall 422 and the side wall 423 enclose a cavity 424, the coil 44 is arranged in the cavity 424, the push rod 41 extends along a moving direction and sequentially passes through the top wall 421, the cavity 424 and the bottom wall 422, an end of the push rod 41 close to the top wall 421 is provided with a pushing block 411, the second elastic reset member 43 is arranged between the pushing block 411 and the top wall 421, the push rod 41 is movably arranged in the magnetic conductive shell 42, when the electromagnetic actuator 40 is powered on, the coil 44 is powered on to drive the push rod 41 to move towards the bottom wall 422 and extend out of the cavity 424, the second elastic reset member 43 is in a compressed state, when the electromagnetic actuator 40 is powered off, the coil 44 is powered off, the second elastic reset member 43 rebounds to an uncompressed state, for retracting the push rod 41 into the magnetic conductive shell 42.

[0064] In some embodiments, as shown in Figure 10 , the control part (for example, an integrated chip) of the electromechanical brake system and the electromagnetic actuator 40 can realize the power-on and power-off of the electromagnetic actuator 40 through one switch tube. Compared with the existing electromagnet, the electromagnetic actuator 40 provided in the embodiments of the present application can reduce the cost on the hardware by not needing to arrange structures such as a position sensor and a permanent magnet. On the other hand, only one switch tube is needed to realize the control of the electromagnetic actuator 40, without the need to build a complex H-bridge circuit.

[0065] In some embodiments, referring to Figure 11 and combining with Figure 7 , the first elastic reset member 30 comprises a first end 31 and a second end 32, the second end 32 abuts against the contact part 22 and can be switched between a compressed state and an uncompressed state. Exemplarily, the second end 32 is arranged below the contact part 22, when the locking part 21 abuts against the ratchet tooth 11, the second end 32 of the first elastic reset member 30 is compressed to be in the compressed state, when the locking part 21 does not abut against the ratchet tooth 11, the second end 32 of the first elastic reset member 30 rebounds to be in the uncompressed state. Exemplarily, the first elastic reset member 30 includes but is not limited to a spring.

[0066] Exemplarily, referring to Figure 11 and combining with Figure 7, the pawl 20 comprises a connecting portion 23, in the unlocked state, the connecting portion 23 is spaced apart from the ratchet wheel 10 along the second direction Y, the connecting portion 23 is provided in a plate shape, one end of the connecting portion 23 is provided with a contact portion 22 and a locking portion 21 along the third direction Z, the other end of the connecting portion 23 is provided with a first end 31 of the first elastic reset member 30, the locking portion 21 is protrudingly provided towards the ratchet wheel 10 along the second direction Y, the contact portion 22 is protrudingly provided along the first direction. Exemplarily, the locking portion 21 is provided in a hook shape, the contact portion 22 has a recess 221 on the side for abutting against the second end 32, the second end 32 abuts against the contact portion 22 in the recess 221.

[0067] In some embodiments, referring to Figure 11 and combining Figure 7 , the parking device comprises a fixing portion 50, the fixing portion 50 is provided at the other end of the connecting portion 23 along the third direction Z, the fixing portion 50 comprises a mounting slot 51, the first end 31 of the first elastic reset member 30 is provided in the mounting slot 51, the first end 31 of the first elastic reset member 30 penetrates the slot wall of the mounting slot 51, and the second end 32 extends out of the mounting slot 51 and is provided below the contact portion 22.

[0068] Exemplarily, the parking device further comprises a rotating shaft 60 and a clamping spring 61, one end of the rotating shaft 60 is connected to the other end of the connecting portion 23 by penetrating the mounting slot 51, the first elastic reset member 30 is wound around the part of the rotating shaft 60 in the mounting slot 51, the clamping spring 61 is provided at the other end of the rotating shaft 60 and is used for abutting against the housing of the electromechanical brake system, and the other end of the rotating shaft 60 is used for rotatably connecting with the housing of the electromechanical brake system. When one end of the connecting portion 23 of the pawl 20 is pressed down, the other end drives the rotating shaft 60 to rotate, so that the clamping spring 61 is pressed, and when the one end of the connecting portion 23 of the pawl 20 returns to the original position, the clamping spring 61 can also provide part of the elastic force to assist the first elastic reset member 30 to move the locking portion 21 away from the ratchet tooth 11.

[0069] In some embodiments, the fixing portion 50 comprises a mounting hole 52 and a limiting portion 53, the mounting hole 52 penetrates the fixing portion 50 and is used for connecting with the housing of the electromechanical brake system. The limiting portion 53 is protrudingly provided on the side of the fixing portion 50 away from the mounting slot 51 along the first direction X, the limiting portion 53 is spaced apart from the connecting portion 23 along the second direction Y, and the limiting portion 53 can prevent the connecting portion 23 from excessively rotating when switching to the unlocked state.

[0070] In some embodiments, referring to Figure 11 and combining Figure 6 , Figure 7The push rod 41 is movably arranged in the magnetic shell 42 along the first direction X. The contact portion 22 comprises an inclined surface 222. When the electromagnetic actuator 40 is powered on, the push rod 41 slides on the inclined surface 222 along the first direction X towards the contact portion 22, and presses the inclined surface 222 to drive the locking portion 21 to move along the pressing direction M until abutting against the ratchet teeth 11. Exemplarily, the contact portion 22 can further comprise a horizontal surface 223. When the electromagnetic actuator 40 is powered on, the push rod 41 moves on the inclined surface 222 along the first direction X to the horizontal surface 223, and the locking portion 21 abutting against the ratchet teeth 11 when the contact portion 22 is pressed. The first direction X is parallel to the axial direction of the ratchet wheel 10, and the second direction Y, the pressing direction M and the rebound direction N are all perpendicular to the axial direction of the ratchet wheel 10. In this way, the electromagnetic actuator 40 can be horizontally arranged, which can be used to reduce the vertical vibration and lateral vibration, and can eliminate the influence of the gravity of the push rod 41.

[0071] In some embodiments, referring to Figure 11 、 Figure 12 The push rod 41 is movably arranged in the magnetic shell 42 along the second direction Y. The electromagnetic actuator 40, the pawl 20 and the ratchet wheel 10 are sequentially and spacedly arranged along the second direction Y. When the electromagnetic actuator 40 is powered on, the push rod 41 presses the contact portion 22 along the pressing direction M to drive the locking portion 21 to move along the pressing direction M until abutting against the ratchet teeth 11. Exemplarily, the present application does not limit the plane where the contact portion 22 contacts with the push rod 41, which can be the horizontal surface 223, the inclined surface 222, a curved surface, etc. The second direction Y, the pressing direction M and the rebound direction N are all perpendicular to the axial direction of the ratchet wheel 10. Exemplarily, the electromagnetic actuator 40 and the pawl 20 can be arranged together at the 9 o'clock or 3 o'clock direction of the ratchet wheel 10, so as to horizontally arrange the electromagnetic actuator 40, which can be used to reduce the vertical vibration and lateral vibration, and can eliminate the influence of the gravity of the push rod 41.

[0072] In some embodiments, referring to Figure 13The electromagnetic actuator 40 comprises a push head 45 arranged at one end of the push rod 41, the push head 45 is connected with the contact part 22, the push head 45 and the contact part 22 jointly move along the pressing direction M, the drive locking part 21 moves along the pressing direction M until abutting against the ratchet 11. Under the action of the first elastic reset part 30, the push head 45 and the contact part 22 can also jointly move along the rebound direction N, so that the locking part 21 is separated from the ratchet 11. Exemplarily, the push head 45 is arranged in a hook shape, the push head 45 is arranged in the contact part 22, after the push rod 41 extends out of the magnetic shell, even in the power-off state, the push rod 41 will not be retracted into the magnetic shell 42, the push rod 41 can move along with the movement of the contact part 22, when the parking device switches to different states, the contact part 22 moves to drive the push rod 41 to move, the movement of the push rod 41 will cause the change of inductance in the electromagnetic actuator 40, which can be used for detecting the position of the push rod 41.

[0073] The application further provides a vehicle comprising at least the above-mentioned electromechanical brake system, when the electromechanical brake system is arranged on the vehicle, the axial direction of the ratchet wheel 10 is parallel to the wheel shaft direction of the vehicle.

[0074] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above content is further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple inferences or replacements, without departing from the spirit and scope of the utility model.

Claims

1. A parking device, characterized in that, The parking device can be switched between the locking state and the unlocking state, and the parking device comprises: A ratchet wheel connected with the driving part of the electromechanical brake system and capable of rotating in the forward direction or the reverse direction to switch between the locking position and the unlocking position, the ratchet wheel comprising a ratchet; A pawl comprising a locking part and a contact part, the locking part and the contact part being connected, the locking part being capable of abutting against the ratchet; A first elastic reset member, one end of the first elastic reset member abutting against the contact part and capable of being switched between the compressed state and the uncompressed state; An electromagnetic actuator comprising a push rod and a magnetically conductive housing, the push rod being movably arranged in the magnetically conductive housing, the push rod being arranged above the contact part; When the electromagnetic actuator is powered on, the push rod penetrates the magnetically conductive housing to press down the contact part, the first elastic reset member is in the compressed state, the locking part abuts against the ratchet, the ratchet wheel is reversed to the locking position, the parking device is switched to the locking state, the electromagnetic actuator is powered off, the ratchet wheel is rotated to the unlocking position, the first elastic reset member rebounds to the uncompressed state, the locking part does not abut against the ratchet, and the parking device is switched to the unlocking state.

2. The parking device of claim 1, wherein, The push rod is movably arranged in the magnetically conductive housing in the first direction, the contact part comprises an inclined surface, when the electromagnetic actuator is powered on, the push rod slides on the inclined surface in the first direction, and the inclined surface is pressed down to drive the locking part to abut against the ratchet in the second direction.

3. The parking device of claim 1, wherein, The push rod is movably arranged in the magnetically conductive housing in the second direction, when the electromagnetic actuator is powered on, the push rod presses down the contact part in the second direction, and the locking part is driven to abut against the ratchet in the second direction.

4. The parking device of claim 3, wherein The electromagnetic actuator comprises a push head arranged at one end of the push rod, and the push head is connected with the contact part.

5. A parking device according to any one of claims 2-4, c h a r a c t e r i s e d i n that The pawl comprises a connecting part, the first elastic reset member comprises a first end and a second end, the first end is arranged at the connecting part, and the second end abuts against below the contact part, when the push rod penetrates the magnetically conductive housing to press down the contact part, the second end is pressed to be in the compressed state, and when the ratchet wheel is rotated to the unlocking position, the second end rebounds to the uncompressed state.

6. The parking device of claim 5, wherein, The pawl comprises a connecting part, the first elastic reset member comprises a first end and a second end, the first end is arranged at the connecting part, and the second end abuts against below the contact part, when the push rod penetrates the magnetically conductive housing to press down the contact part, the second end is pressed to be in the compressed state, and when the ratchet wheel is rotated to the unlocking position, the second end rebounds to the uncompressed state.

7. The parking device of claim 6, wherein The pawl comprises a connecting part, the first elastic reset member comprises a first end and a second end, the first end is arranged at the connecting part, and the second end abuts against below the contact part, when the push rod penetrates the magnetically conductive housing to press down the contact part, the second end is pressed to be in the compressed state, and when the ratchet wheel is rotated to the unlocking position, the second end rebounds to the uncompressed state. The pawl comprises a connecting part, the first elastic reset member comprises a first end and a second end, the first end is arranged at the connecting part, and the second end abuts against below the contact part, when the push rod penetrates the magnetically conductive housing to press down the contact part, the second end is pressed to be in the compressed state, and when the ratchet wheel is rotated to the unlocking position, the second end rebounds to the uncompressed state.

8. A parking device as claimed in any one of claims 2 to 4, wherein, The electromagnetic actuator comprises a second elastic reset member arranged at the other end of the push rod away from the contact part, when the electromagnetic actuator is powered, the second elastic reset member is in a compressed state, when the electromagnetic actuator is powered off, the second elastic reset member rebounds to an uncompressed state, for retracting the push rod into the magnetically conductive shell.

9. An electromechanical brake system characterized by, Comprising: The parking device according to any one of claims 1-8; A housing connected with the other end of the rotating shaft of the parking device; A driving part connected with the ratchet of the parking device, for driving the ratchet to switch between the reverse rotation state and the forward rotation state.

10. A vehicle characterized by comprising: An electromechanical brake system comprising the parking device according to claim 9.

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