Parking locking device with re-clamping function

Abstract

The utility model relates to the field of brake calipers, and discloses a parking locking device with a re-clamping function, which comprises a parking ratchet wheel, an electromagnet assembly, a parking pawl and an elastic reed, and the parking ratchet wheel is in interference fit with an output shaft of a brake motor and is driven by the brake motor to rotate; the electromagnet assembly comprises a bidirectional self-holding electromagnet and a magnetic push rod, and a pin radially extending out is fixed on the magnetic push rod; the parking pawl is arranged on the parking pawl rotating shaft in a sleeving mode and can rotate on the parking pawl rotating shaft, and a pawl hook used for being meshed with the parking ratchet extends out of one side of the parking pawl. The elastic reed comprises an elastic buffering part and a sleeving part which are integrally formed, one end of the elastic buffering part is fixedly installed on the other side, away from the pawl hook, of the parking pawl, and the other end of the elastic buffering part is connected with the sleeving part. When the magnetic push rod is in a stretching-out state, the pressure of meshing of the pawl hook to the parking pawl is provided all the time. The parking pawl is always meshed with the ratchet wheel when the magnetic push rod extends out, and the re-clamping process is simple and fast.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of brake caliper, especially to a parking locking device with re-clamping function. BACKGROUND

[0002] With the development of brake-by-wire technology, EMB (Electro-Mechanical Brake System) as the ultimate solution of brake-by-wire technology needs to contain both driving and parking functions. Because in the transmission scheme of the electronic mechanical brake caliper assembly, it is necessary to ensure the rapid and accurate control of braking force during driving braking, high transmission efficiency mechanical structures are needed, and self-locking structures with low transmission efficiency cannot be used, so the nut screw transmission mechanism used in the existing hydraulic caliper assembly cannot be used to realize the parking braking function of the vehicle, and an additional parking braking actuator is needed to realize the parking braking function. The existing technology basically uses an electromagnet as a power source to make the magnetic push rod exit or retract by using the positive direction of the electromagnet, thereby having locking and unlocking functions. For example, in the Chinese invention patent with the patent number CN 117905879A and the name of electronic mechanical parking self-locking mechanism, control method and vehicle, when the brake motor needs to be locked, the brake motor is kept at a certain braking force, the solenoid valve is powered on to push the pawl to the locking position through the magnetic push rod, at this time the pawl extends into the adjacent two ratchet teeth, then the brake motor is powered off, at this time the brake motor is reversely rotated due to the action of the load, thereby driving the ratchet and pawl to be clamped, then the solenoid valve is powered off to lock the brake motor. However, this structure needs to be unlocked when the braking force needs to be increased when the brake motor is limited to rotate forward in the locked state, then the brake motor is reversely rotated to increase the braking force, then the brake motor is locked by the solenoid valve, which needs to unlock the motor first, reversely rotate to increase the braking force, and then lock again, resulting in response delay and complicated steps, which also affects the purpose of precise control at the first time. Therefore, a mechanical brake locking structure is needed to solve the above problems. SUMMARY

[0003] The utility model provides.

[0004] To solve the above technical problems, the utility model solves them through the following technical solutions:

[0005] The parking lock device with re-clamping function comprises a parking ratchet, an electromagnet assembly, a parking pawl, and an elastic spring sheet. The parking ratchet is assembled on the output shaft of the brake motor in interference and is driven to rotate by the output shaft of the brake motor. The electromagnet assembly comprises a bidirectional self-holding electromagnet and a magnetic push rod. The bidirectional self-holding electromagnet drives the magnetic push rod to extend or retract through forward or reverse power supply, and the magnetic push rod is kept in the state by the built-in permanent magnet of the bidirectional self-holding electromagnet. A pin is fixed on the magnetic push rod. The parking pawl is sleeved on the parking pawl shaft and can rotate on the parking pawl shaft. The parking pawl extends a pawl hook on one side for engaging with the parking ratchet. The elastic spring sheet is used for connecting the parking pawl and the magnetic push rod. The elastic spring sheet comprises an integral elastic buffer part and a sleeving part. One end of the elastic buffer part is fixedly installed on the other side of the parking pawl away from the pawl hook, and the other end is connected with the sleeving part. The sleeving part forms an annular hole in the center, and is sleeved on the pin and can rotate on the pin. When the magnetic push rod is in the extended state, the elastic spring sheet always provides the pressure of the pawl hook engaging with the parking pawl. The bidirectional self-holding electromagnet push rod and the parking pawl are elastically connected. The bidirectional self-holding electromagnet can make the push rod (extend or retract) after power supply to the positive and negative electrodes, and the push rod can be kept at the original position after power off. In the parking state, the parking pawl is always closely engaged with the parking ratchet under the pre-tightening force provided by the elastic spring sheet, and can be directly rotated to the parking brake force increasing direction and then re-engaged, realizing re-clamping of parking without the need of reverse power supply of the bidirectional self-holding electromagnet to make the push rod retreat and release the parking, waiting for re-parking, and then the bidirectional self-holding electromagnet is power supplied to the positive electrode again to engage the parking pawl with the parking ratchet for parking lock.

[0006] As preferred, the magnetic push rod is provided with a parking hook seat at the end away from the bidirectional self-holding electromagnet, and the pin is fixedly installed in the parking hook seat perpendicularly to the magnetic push rod.

[0007] As preferred, the rotating surface of the parking ratchet, the rotating surface of the parking pawl, and the rotating surface of the sleeving part are parallel to each other.

[0008] As preferred, the elastic buffer part is in a reciprocating wave shape, and the center of the connection between the elastic buffer part and the parking pawl and the center of the sleeving part are located on the wave center line of the elastic buffer part.

[0009] As preferred, the parking lock device comprises an outer shell, the outer shell is provided with an opening on the side edge, the magnetic push rod is located on the inner side of the opening, and the magnetic push rod is manually changed to the parking lock position or the parking release position.

[0010] As preferred, the outer opening is detachably connected with a cover plate, the cover plate is connected with the magnetic push rod through a wire harness, and the cover plate is used for manually pulling the magnetic push rod to the parking release position.

[0011] As preferred, the parking pawl side is provided with a containing hole, the end of the elastic buffer part is embedded in the containing hole, and the shapes of the two are matched to form the circumferential limiting of the end of the elastic buffer part.

[0012] As preferred, the utility model discloses the above technical scheme has remarkable technical effect:

[0013] The utility model discloses the bidirectional self-keeping electromagnet is used as the parking locking, and the action execution mechanism is removed, and the position of bidirectional self-keeping electromagnet drive magnetic push rod can be adjusted conveniently through changing its positive, and the opposite direction can rely on its built-in permanent magnet and keep magnetic push rod at the current position.

[0014] The utility model discloses the elastic buffer of elastic spring piece and the pin rotation cooperation, and the parking pawl always keeps meshing with the ratchet wheel under the bidirectional self-keeping electromagnet magnetic push rod extension state, and the brake force adjustment does not need to be unlocked again and locked step, and the response time is short, solves the brake force adjustment step complicated problem of prior art, and the elastic connection of bidirectional self-keeping electromagnet magnetic push rod and pawl adapts the dynamic meshing demand of ratchet wheel, makes the parking locking, and the control flow of release is simpler, and the control precision requirement is lower. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structural schematic diagram of the utility model;

[0016] Figure 2 It is the structural schematic diagram of the parking locking device;

[0017] Figure 3 It is the structural schematic diagram when the outer shell cover plate is opened;

[0018] Figure 4 It is the structural schematic diagram of the electromagnet assembly;

[0019] Figure 5 It is the connecting structure schematic diagram of the parking ratchet wheel and elastic spring piece;

[0020] Figure 6 It is the working principle schematic diagram of each brake state.

[0021] The names of the parts referred to by the numbers in the above drawings are as follows: wherein 1, electromagnet assembly; 11, bidirectional self-holding electromagnet; 111, magnetic push rod; 16, pin; 17, parking hook seat; 2, parking pawl; 22, pawl hook; 23, elastic spring piece; 231, elastic buffer part; 232, sleeving part; 233, annular hole; 4, parking ratchet wheel; 5, parking pawl rotating shaft; 6, brake motor; 8, outer shell; 82, opening; 83, cover plate. DETAILED DESCRIPTION

[0022] The utility model will be described in further detail below in combination with the drawings and examples.

[0023] Example 1

[0024] A parking locking device with re-clamping function, as shown in the drawings, comprises a parking ratchet wheel 4, an electromagnet assembly 1, a parking pawl 2, and an elastic spring piece 23. Figures 1-2 The parking ratchet wheel 4 is interference-fitted on the output shaft of the brake motor 6 and is driven to rotate by the output shaft of the brake motor 6. The electromagnet assembly 1 comprises a bidirectional self-holding electromagnet 11 and a magnetic push rod 111. The bidirectional self-holding electromagnet 11 drives the magnetic push rod 111 to extend or retract through forward or reverse power supply and keeps the magnetic push rod 111 in the state by the built-in permanent magnet of the bidirectional self-holding electromagnet 11. The magnetic push rod 111 is fixed with a radially extending pin 16. The parking pawl 2 is sleeved on the parking pawl rotating shaft 5 and is rotatable on the parking pawl rotating shaft 5. The parking pawl 2 has a pawl hook 22 extending from one side for engaging with the parking ratchet wheel 4. The elastic spring piece 23 is used for connecting the parking pawl 2 and the magnetic push rod 111. The elastic spring piece 23 comprises an integrally formed elastic buffer part 231 and a sleeving part 232. One end of the elastic buffer part 231 is fixedly installed on the other side of the parking pawl 2 away from the pawl hook 22, and the other end is connected with the sleeving part 232. The sleeving part 232 forms an annular hole 233 in the center, and the sleeving part 232 is sleeved on the pin 16 through the annular hole 233 and is rotatable on the pin 16. When the magnetic push rod 111 is in the extended state, the pawl hook 22 always provides pressure for engaging with the parking pawl 2 through the transmission of the elastic spring piece 23.

[0025] As shown in the drawings, the parking locking device comprises an outer shell 8. The outer shell 8 is provided with an opening 82 at the side. The magnetic push rod 111 is located inside the opening 82, and is used for manually changing the magnetic push rod 111 to the parking locking position or the parking releasing position. Figure 3 The opening 82 is detachably connected with a cover plate 83 outside. The cover plate 83 is connected with the magnetic push rod 111 through a wire harness, and is used for manually pulling the magnetic push rod 111 to the parking releasing position.

[0026] As shown in the drawings,

[0027] Figure 4 ​As shown, a parking hook seat 17 is installed at the end of the magnetic push rod 111 away from the bidirectional self-holding electromagnet 11, and a pin 16 is fixedly installed in the parking hook seat 17 perpendicular to the magnetic push rod 111.

[0028] like Figure 5 As shown, the rotating surfaces of the parking ratchet 4, the parking pawl 2, and the sleeve 232 are parallel to each other.

[0029] The elastic buffer 231 has a reciprocating wave shape, and the center of the connection between the elastic buffer 231 and the parking pawl 2 and the center of the sleeve 232 are both located on the wave centerline of the elastic buffer 231.

[0030] The parking pawl 2 is driven by the meshing gear transmission group 7, which is connected to the vehicle brake actuator, thereby driving the friction pad to clamp the brake disc or release it.

[0031] The parking pawl 2 has a receiving hole on its side, and the end of the elastic buffer part 231 is fitted into the receiving hole. The two are matched in shape to form a circumferential limit on the end of the elastic buffer part 231.

[0032] like Figure 6 As shown, the working principle is as follows:

[0033] Locking Phase: The brake motor drives the ratchet to rotate forward until the braking force reaches the target braking force and is maintained. The electromagnet is energized in the forward direction, the magnetic push rod 111 extends and drives the parking pawl 2 to engage with the ratchet 4 through the elastic spring 23. Subsequently, the brake motor is de-energized and rotates in the reverse direction under the load, causing the ratchet to press against the pawl, thus locking the brake motor shaft again.

[0034] Alternatively, the following implementation method can be used:

[0035] When the electromagnet is energized in the forward direction, the magnetic push rod 111 extends and drives the parking pawl 2 to engage with the ratchet 4 through the elastic spring 23. The brake motor drives the ratchet to rotate in the forward direction until the braking force reaches the target braking force. Then the brake motor is de-energized and rotates in the reverse direction under the load, causing the ratchet to press against the pawl, thus locking the brake motor shaft again.

[0036] Re-clamping stage: when the braking force needs to be increased, the brake motor directly continues to drive the ratchet wheel 4 in the forward direction, and the parking pawl 2 is automatically driven to be pulled up by the elastic spring sheet, the elastic buffer part 231 is deformed, and the elastic buffer part 231 rebounds to make the parking pawl 2 be locked in the tooth groove of the ratchet wheel 4 again. No additional power-off and power-on adjustment of the bidirectional self-holding electromagnet is needed. In the parking locking state, when the controller receives the parking re-clamping instruction, it indicates that the braking force is insufficient, and the brake motor needs to be rotated in the forward direction to increase the braking force. Therefore, the controller sends a power-on signal to the electromagnet, the electromagnet is powered on first, the magnetic push rod is extended, the elastic spring sheet applies pressure to the parking pawl 2 and pushes the parking pawl 2, avoiding the parking pawl 2 from returning to the unlocked position under the tension of the elastic spring sheet 23 when the brake motor rotates in the forward direction, and then the controller controls the brake motor to drive the ratchet wheel to rotate in the forward direction until the braking force reaches the second target braking force, and then the controller sends a power-off signal to the brake motor, the brake motor is powered off, and the brake motor reversely rotates under the action of the load to make the ratchet wheel abut against the parking pawl 2, and the locking of the brake motor is realized again.

[0037] Parking brake cancellation: the electromagnet is reversely powered on, the magnetic push rod 111 retreats, at this time the parking pawl continuously receives the reverse elastic force generated by the deformation of the spring sheet in the direction of making the parking pawl and the parking ratchet wheel separate, at this time the brake motor applies a slightly larger braking torque, the parking ratchet wheel can be separated from the parking pawl, and the parking pawl is separated from the parking ratchet wheel 4 under the action of the spring elastic force and remains in the parking release position to release the parking state.

[0038] Control method:

[0039] Parking locking control instruction:

[0040] S1. The caliper assembly controller obtains the parking locking control instruction.

[0041] S2. The controller sends a power-on signal to the brake motor, after the brake motor is powered on, the controller controls the brake motor to drive the transmission group to rotate in the forward direction until the target braking force is reached and is continuously maintained.

[0042] S3. The controller sends a power-on signal to the electromagnet, the electromagnet is powered on in the forward direction, and the magnetic push rod moves the pawl from the unlocked position to the locked position (the parking pawl is engaged with the parking ratchet wheel) through the elastic spring sheet.

[0043] S4. The controller sends a power-off signal to the brake motor, the brake motor is powered off, after a preset time T1, the controller sends a power-off signal to the electromagnet, the electromagnet is powered off, the magnetic push rod is retracted, and the parking locking is completed.

[0044] Parking re-clamping control instruction:

[0045] S1. The caliper assembly controller obtains the parking clamping control instruction.

[0046] S2. The controller sends a power-on signal to the brake motor, and the brake motor drives the transmission set to rotate forward to reach the target braking force.

[0047] S3. The controller sends a power-off signal to the brake motor, and the brake motor is powered off.

[0048] S4. The vehicle detects whether the parking clamping force of the caliper assembly meets the requirements. If it meets the requirements, the parking process is completed. If it does not meet the requirements, the above steps are executed again.

[0049] Parking release control instruction:

[0050] S1. The caliper assembly controller obtains the parking release control instruction.

[0051] S2. The controller sends a power-on signal to the brake motor. After the brake motor is powered on, the controller controls the brake motor to drive the transmission set to rotate forward until it is slightly larger than the current parking braking force, and is continuously maintained.

[0052] S3. The controller sends a power-on signal to the electromagnet, and the electromagnet is reversely powered on. The magnetic push rod retreats, and the parking pawl moves from the locking position to the unlocking position under the action of the elastic spring sheet.

[0053] S4. The controller sends a power-off signal to the brake motor, and the brake motor is powered off.

[0054] Failure protection:

[0055] Manual parking release process: manually open the cover plate 83 fixed outside the outer shell 8 and pull it outward. The magnetic push rod is pulled back through the connection between the cover plate 83 and the magnetic push rod hole, thereby achieving the effect of reverse power-on of the bidirectional self-holding electromagnet. At this time, the parking pawl moves from the locking position to the unlocking position under the action of the elastic spring sheet. At this time, the brake motor applies a slightly larger braking torque, and the parking pawl is separated from the parking ratchet under the action of the spring force, so as to release the parking state.

[0056] Manual parking locking process: first make the parking pawl engage with the parking ratchet, and then power on the brake motor to apply braking force. The specific implementation is as follows: manually open the cover plate fixed outside the outer shell, use a tool to push the magnetic push rod into the parking locking state, and make the parking pawl engage with the parking ratchet, thereby achieving the effect of forward power-on of the bidirectional self-holding electromagnet. The brake motor is powered on, and the controller controls the brake motor to drive the transmission set to rotate forward to meet the parking braking force. During this process, the parking pawl and the parking ratchet remain engaged.

[0057] In the description of the utility model, need understanding is, the orientation or position relation that the terms "center", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" indicate is based on the orientation or position relation shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not indicating or implying that the indicated device or element must have a particular orientation, is constructed and operated in a particular orientation, therefore can not be understood as a restriction on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise expressly specifically limited.

[0058] In summary, the above is only a preferred embodiment of the utility model, and any changes and modifications made in accordance with the scope of the utility model patent application shall be within the scope of the utility model patent.

Claims

1. A parking lock device with a re-clamping function, characterized in that, include The parking ratchet (4) is interference-fitted to the output shaft of the brake motor (6) and is driven to rotate by the output shaft of the brake motor (6); The electromagnet assembly (1) includes a bidirectional self-holding electromagnet (11) and a magnetic push rod (111). The bidirectional self-holding electromagnet (11) drives the magnetic push rod (111) to extend or retract by forward or reverse energization. The magnetic push rod (111) is held in this state by the permanent magnet built into the bidirectional self-holding electromagnet (11). A radially extending pin (16) is fixed on the magnetic push rod (111). Parking pawl (2), the parking pawl (2) is sleeved on the parking pawl shaft (5) and can rotate on the parking pawl shaft (5), and a pawl hook (22) extends out on one side of the parking pawl (2) for engaging with the parking ratchet (4). The elastic spring (23) connects the parking pawl (2) and the magnetic push rod (111); the elastic spring (23) includes an integrally formed elastic buffer part (231) and a sleeve part (232). One end of the elastic buffer part (231) is fixedly installed on the other side of the parking pawl (2) away from the pawl hook (22), and the other end is connected to the sleeve part (232). An annular hole (233) is formed in the center of the sleeve part (232). The sleeve part (232) is sleeved on the pin (16) through the annular hole (233) and can rotate on the pin (16); When the magnetic push rod (111) is in the extended state, it always provides the pressure of the pawl hook (22) engaging the parking pawl (2) through the transmission of the elastic spring (23).

2. A parking lock device with re-clamping function according to claim 1, characterized in that: A parking hook seat (17) is installed at the end of the magnetic push rod (111) away from the bidirectional self-holding electromagnet (11), and a pin (16) is fixedly installed in the parking hook seat (17) perpendicular to the magnetic push rod (111).

3. A parking lock device with re-clamping function according to claim 1, characterized in that: The rotating surfaces of the parking ratchet (4), the parking pawl (2), and the sleeve (232) are parallel to each other.

4. A parking lock device with re-clamping function according to claim 1, characterized in that: The elastic buffer (231) is in the shape of a reciprocating wave. The center of the connection between the elastic buffer (231) and the parking pawl (2) and the center of the sleeve (232) are both located on the center line of the wave of the elastic buffer (231).

5. A parking lock device with re-clamping function according to claim 1, characterized in that: The parking lock device includes a housing (8), with an opening (82) on the side of the housing (8). A magnetic push rod (111) is located inside the opening (82) and is used to manually change the magnetic push rod (111) to the parking lock position or the parking release position.

6. A parking lock device with re-clamping function according to claim 5, characterized in that: A cover plate (83) is detachably connected to the opening (82). The cover plate (83) is connected to the magnetic push rod (111) via a wire harness and is used to manually pull the magnetic push rod (111) to the parking release position.

7. A parking lock device with re-clamping function according to claim 1, characterized in that: The parking pawl (2) has a receiving hole on its side, and the end of the elastic buffer (231) is fitted into the receiving hole. The two are matched in shape to form a circumferential limit on the end of the elastic buffer (231).

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