Parking lock system, vehicle

Abstract

This application provides a parking lock system and a vehicle. The parking lock system includes: a lead screw; a drive nut engaged with the lead screw; a bushing located radially outside the drive nut, a first elastic element disposed within the bushing, the drive nut abutting against the bushing axially via the first elastic element; a locking unit configured such that when the bushing moves in a first axial direction, the locking unit locks the parking gear, and when the bushing moves in a second axial direction, the locking unit unlocks the parking gear; a locking plate pressing against the drive nut axially against the first elastic element, the pressing relationship between the locking plate and the drive nut being configured to be controllably released, the bushing moving axially with the drive nut when the locking plate presses against the drive nut; and when the pressing relationship between the locking plate and the drive nut is released, the first elastic element pushes the bushing to move relative to the drive nut in the first direction, thereby locking the parking gear by the locking unit.

Description

Technical Field

[0001] This application relates to the field of transmission technology, and in particular to parking lock systems and vehicles. Background Technology

[0002] Parking lock systems are widely used in vehicles. A parking lock system typically includes a parking lock wheel and a locking pawl that can switch between locked and unlocked positions. Usually, locking and unlocking of the locking pawl is driven by an electric motor or hydraulic system. However, if the electric motor or hydraulic system malfunctions, the parking lock function cannot be achieved, affecting personal and property safety. Utility Model Content

[0003] To address or mitigate at least one of the problems mentioned in the background art, this application provides a parking lock system and a vehicle.

[0004] The parking lock system provided in this application includes: a power unit; a lead screw driven to rotate by the power unit; a drive nut engaged with the lead screw, wherein when the lead screw rotates, the drive nut can move linearly in the axial direction of the lead screw, and after the lead screw stops rotating, the drive nut can self-lock onto the lead screw; a bushing located radially outside the drive nut, wherein a first elastic element is provided inside the bushing, and the drive nut abuts against the bushing in the axial direction via the first elastic element; and a locking unit configured such that when the bushing moves in a first direction in the axial direction, the locking unit... The locking unit can lock the parking gear. When the bushing moves in a second direction along the axial direction, the locking unit unlocks the parking gear. A locking plate, which, together with the first elastic member, presses against the drive nut in the axial direction, is configured to be controllably released. When the locking plate presses against the drive nut, the bushing moves along the axial direction with the drive nut. When the pressing relationship between the locking plate and the drive nut is released, the first elastic member pushes the bushing to move relative to the drive nut in the first direction, thereby locking the parking gear.

[0005] In at least one embodiment, the outer peripheral surface of the drive nut has a groove, the locking plate is hinged to the bushing, the locking plate can extend at least partially into the groove, and one axial side of the locking plate can press against one axial side of the groove.

[0006] In at least one embodiment, the parking lock system includes: a second elastic member abutting against the lock plate for providing a torque for extending the lock plate into the groove; and an electromagnetic unit abutting against the lock plate for providing a torque for disengaging the lock plate from the groove, the electromagnetic unit being controllably on and off.

[0007] In at least one embodiment, the electromagnetic unit and the power unit are configured to use different power sources, and / or the electromagnetic unit and the power unit do not share a housing.

[0008] In at least one embodiment, the electromagnetic unit includes a controllable telescopic abutment shaft, and the hinge shaft of the locking plate, which is hinged to the bushing, is located between the abutment shaft and the point where the second elastic element applies force to the locking plate.

[0009] In at least one embodiment, the electromagnetic unit is configured such that when the electromagnetic unit is de-energized, the abutment shaft extends, and the pressing relationship between the locking plate and the drive nut is released.

[0010] In at least one embodiment, the lead screw includes a shoulder, which the drive nut abuts against after moving in the second direction; and / or the parking lock system further includes a blocking member for connection to a fixed part of the vehicle, which the bushing abuts against after moving in the first direction.

[0011] In at least one embodiment, the parking lock system includes a bushing position sensor for detecting the position of the bushing to determine the parking status.

[0012] In at least one embodiment, the power unit includes a nut position sensor for detecting the position of the drive nut on the lead screw.

[0013] The vehicle provided in this application includes the parking lock system as described above.

[0014] Compared to conventional parking lock systems driven solely by a motor, the parking lock system provided in this application has an emergency parking lock function. In the event of a power unit failure, the drive nut and bushing can be controlled to unlock in an emergency. The bushing is moved by the first elastic element to achieve emergency parking lock, which is beneficial to the personal and property safety of the user. Attached Figure Description

[0015] Figure 1 A schematic diagram of the parking lock system according to an embodiment of this application is shown.

[0016] Figure 2 A cross-sectional view of the bushing of a parking lock system according to an embodiment of this application is shown.

[0017] Figure 3 A cross-sectional view of a parking lock system according to an embodiment of this application is shown, which is a conventional parking lock mode.

[0018] Figure 4A cross-sectional view of a parking lock system according to an embodiment of this application is shown, in emergency parking lock mode.

[0019] Figure 5 A cross-sectional view of a parking lock system according to an embodiment of this application is shown, which is restored from emergency parking lock mode to normal parking lock mode.

[0020] Figure 6 An isometric view of the drive nut of a parking lock system according to an embodiment of this application is shown.

[0021] Figure 7 An isometric view of a parking lock system according to an embodiment of this application is shown, wherein the lock plate is axially pressed against the drive nut.

[0022] Figure 8 An isometric view of a parking lock system according to an embodiment of this application is shown, wherein the axial pressing relationship between the lock plate and the drive nut is released.

[0023] Figure 9 It shows Figure 7 Side view of the parking lock system in the car.

[0024] Figure 10 It shows Figure 8 Side view of the parking lock system in the car.

[0025] Explanation of reference numerals in the attached figures

[0026] 10. Power unit;

[0027] 20 lead screw;

[0028] 201 Shaft Shoulder;

[0029] 30 Drive nut;

[0030] 301 Outer peripheral surface; 302 Groove; 303 Surface;

[0031] 40 bushing;

[0032] 50 First elastic element;

[0033] 60 locking units;

[0034] 601 Parking gear; 602 Shaft; 603 Tapered part; 604 Pawl; 605 Tensioner; 606 Hole;

[0035] 70 Locking plate;

[0036] 701 sides;

[0037] 80 Second elastic element;

[0038] 90 Electromagnetic units;

[0039] 91. Abutment shaft;

[0040] 100 Fixed part;

[0041] 110 Blocking component;

[0042] 120 shaft sleeve position sensor;

[0043] 121. Magnet;

[0044] A-axis;

[0045] A1 is the first direction; A2 is the second direction;

[0046] R radial

[0047] J hinge axis Detailed Implementation

[0048] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0049] This application provides a parking lock system and a vehicle. The parking lock system may be an integral part of the vehicle.

[0050] See Figure 1 , Figure 2 , Figure 3 The parking lock system may include a power unit 10, a lead screw 20, and a drive nut 30. The lead screw 20 is driven to rotate by the power unit 10. The drive nut 30 engages with the lead screw 20, and when the lead screw 20 rotates, the drive nut 30 can move linearly along the axial direction A of the lead screw 20. After the lead screw 20 stops rotating, the drive nut 30 can self-lock onto the lead screw 20.

[0051] See Figure 2 , Figure 3 The parking lock system may also include a bushing 40 located radially outside the drive nut 30. A first elastic element 50 is disposed within the bushing 40, and the drive nut 30 abuts against the bushing 40 in the axial direction A via the first elastic element 50. The first elastic element 50 is, for example, a spring.

[0052] See Figure 1 The parking lock system may further include a locking unit 60, which is configured such that when the bushing 40 moves in a first direction A1 along the axial direction A, the locking unit 60 can lock the parking gear 601, preventing the parking gear 601 from rotating. When the bushing 40 moves in a second direction A2 along the axial direction A, the locking unit 60 unlocks the parking gear 601, allowing the parking gear 601 to rotate.

[0053] For example, participate Figure 1 , Figure 3 The locking unit 60 may further include a shaft 602, a tapered member 603, and a pawl 604. The shaft 602 is connected to a bushing 40, and the tapered member 603 is connected to the shaft 602. Both the shaft 602 and the tapered member 603 move synchronously with the bushing 40. It is understood that the tapered member 603 can be slidably mounted on the shaft 602, and a spring fitted onto the shaft 602 can press the tapered member 603 against one end of the shaft 602 along a first direction A1. When the shaft 602 moves along the first direction A1, and the movement of the tapered member 603 is obstructed, the spring can buffer the movement and release it after the obstruction to the movement of the tapered member 603 is eliminated.

[0054] The pawl 604 can be hinged to the fixed part 100 of the vehicle. The pawl 604 can be equipped with a tensioning element 605 (e.g., a torsion spring), which provides a torque to move the pawl 604 away from the parking gear 601. A pressure block with a large hole 606 can be provided on the pawl 604. When the tapered member 603 is inserted into this hole 606, the pressure block gradually applies a torque close to the parking gear 601 to the pawl 604, causing the pawl 604 to engage with the parking gear 601. The parking gear 601 can remain relatively stationary with the vehicle's tires, axles, and other components. Therefore, when the bushing 40 moves to the right, the pawl 604 engages with the parking gear 601, achieving parking lock; when the bushing 40 moves to the left, the pawl 604 disengages from the parking gear 601, releasing the parking lock.

[0055] See Figure 2 The parking lock system may also include a lock plate 70, in which the first elastic element 50 is compressed when the lock plate 70 presses against the drive nut 30. The lock plate 70 and the first elastic element 50 press against the drive nut 30 in opposite directions along axial A, and the pressing relationship between the lock plate 70 and the drive nut 30 is configured to be controllably released.

[0056] Below, this application provides several examples of working states.

[0057] I. Normal parking lock status

[0058] See Figure 3 , Figure 7 , Figure 9 The locking plate 70 maintains a pressing relationship with the drive nut 30, and the drive nut 30 and bushing 40 move synchronously. The power unit 10 controls the rotation of the lead screw 20, which in turn controls the movement of the drive nut 30 and bushing 40 along the first direction A1, thereby achieving parking lock.

[0059] II. Power unit 10 malfunction, emergency parking lock engaged.

[0060] See Figure 4 , Figure 8 , Figure 10 The pressing relationship between the locking plate 70 and the drive nut 30 is released, allowing the drive nut 30 and the bushing 40 to move relative to each other. The drive nut 30 self-locks to the lead screw 20, and the bushing 40 moves along the first direction A1 under the action of the first elastic element 50, thus achieving parking lock.

[0061] III. Power unit 10 is restored to its normal state.

[0062] See Figure 5 The power unit 10 controls the lead screw 20 to rotate, which in turn controls the drive nut 30 and bushing 40 to move along the first direction A1. The first elastic element 50 is recompressed, and the locking plate 70 resumes its pressing relationship with the drive nut 30, returning to a synchronous motion state, with its position controlled by the power unit 10 and the lead screw 20.

[0063] Therefore, compared with conventional parking lock systems that rely solely on a motor to lock and unlock the vehicle, the parking lock system provided in this application has an emergency parking lock function. When the power unit 10 fails, the drive nut 30 and bushing 40 are unlocked in an emergency, and the bushing 40 is moved by the first elastic element 50 to achieve emergency parking lock, which is beneficial to the personal and property safety of the user.

[0064] In one implementation, see Figures 6 to 10 The outer peripheral surface 301 of the drive nut 30 may have a groove 302. The locking plate 70 may be hinged to the bushing 40, and the locking plate 70 may extend at least partially into the groove 302. See also Figure 2 The axial surface 701 of the locking plate 70 can press against the axial surface 303 of the groove 302. Of course, this application does not limit the contact method of the locking plate 70 and the drive nut 30.

[0065] In one implementation, see Figures 7 to 10 The parking lock system may include a second elastic element 80 and an electromagnetic unit 90. The second elastic element 80 abuts against the lock plate 70 and provides a torque for extending the lock plate 70 into the recess 302. The electromagnetic unit 90 abuts against the lock plate 70 and provides a torque for disengaging the lock plate 70 from the recess 302; the electromagnetic unit 90 is controllably on and off.

[0066] For example, the second elastic element 80 is a torsion spring. The electromagnetic unit 90 may include a controllable extension and retraction abutment shaft 91. When the electromagnetic unit 90 is energized, the abutment shaft 91 extends and presses against the locking plate 70, causing the locking plate 70 to move away from the groove 302. When the electromagnetic unit 90 is de-energized, the abutment shaft 91 retracts, and the locking plate 70 maintains a force rotating towards the groove 302 under the action of the second elastic element 80, which saves more power. Of course, the abutment shaft 91 can also be made to extend when the electromagnetic unit 90 is de-energized and retract when energized, so that even if the circuit of the electromagnetic unit 90 is damaged, it can still perform emergency parking locking, which is safer. The hinge shaft J of the locking plate 70, which is hinged to the bushing 40, can be located between the abutment shaft 91 and the point of force application of the second elastic element 80 to the locking plate 70.

[0067] In one embodiment, the electromagnetic unit 90 and the power unit 10 are configured to use different power sources. The electromagnetic unit 90 and the power unit 10 do not share a housing (or use a first housing and a second housing respectively). The electromagnetic unit 90 and the power unit 10 of this application have a high degree of independence, can be maintained separately, and have lower costs. The emergency parking lock function provided by the electromagnetic unit 90 can be selected as needed; for example, if the emergency parking lock function is not required, the electromagnetic unit 90 can be omitted, saving costs without interfering with the conventional parking lock function.

[0068] In one implementation, see Figure 3 , Figure 4 The lead screw 20 includes a shoulder 201. After the drive nut 30 moves along the second direction A2, it can abut against the shoulder 201 to avoid interfering with the power unit 10.

[0069] In one implementation, see Figure 3 , Figure 4 The parking lock system also includes a blocking member 110 for connection to the fixed part 100. After the bushing 40 moves along the first direction A1, it can abut against the blocking member 110 to avoid interfering with the locking unit 60 or other components.

[0070] In one implementation, see Figure 1 , Figure 2 , Figure 3 The parking lock system includes a bushing position sensor 120, which detects the position of the bushing 40 to determine the parking status. The parking status is determined based on the position of the bushing 40, providing signals for starting and stopping components such as the power unit 10 and the electromagnetic unit 90.

[0071] More specifically, see Figure 2 A magnet 121 can be installed on the bushing 40. The bushing position sensor 120 can be a Hall sensor, which determines the position of the bushing 40 by detecting the position of the magnet 121.

[0072] In one embodiment, the power unit 10 includes a nut position sensor for detecting the position of the drive nut 30 on the lead screw 20. For example, the position of the drive nut 30 can be determined by changes in parameters such as current. Of course, this application does not limit the specific principle of the sensor used to achieve this purpose. In one example, when in the state of "III. Power unit 10 reset, returning to normal state," the nut position sensor can determine whether the drive nut 30 has moved to the point where the locking plate 70 aligns with the groove 302. If aligned, the power unit 10 stops. That is, the nut position sensor can be used to determine the stopping point of the power unit 10.

[0073] In one embodiment, the power unit 10 can be an electric motor, especially a brushless DC motor, which has the advantages of high efficiency, long life and low noise.

[0074] In one implementation, see Figure 6 The inner cavity of the bushing 40 and the outer shape of the drive nut 30 are roughly cuboid, which facilitates positioning and avoids relative rotation.

[0075] The vehicle provided in this application may include the aforementioned parking lock system.

[0076] The above are preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A parking lock system, characterized in that, include: Power unit; A lead screw, which is driven to rotate by the power unit; A drive nut engages with the lead screw. When the lead screw rotates, the drive nut can move linearly in the axial direction of the lead screw. After the lead screw stops rotating, the drive nut can self-lock onto the lead screw. A bushing is located on the radially outer side of the drive nut, and a first elastic element is provided inside the bushing. The drive nut abuts against the bushing in the axial direction via the first elastic element. A locking unit is configured such that when the bushing moves in a first direction along the axial direction, the locking unit can lock the parking gear, and when the bushing moves in a second direction along the axial direction, the locking unit can unlock the parking gear. A locking plate, which, together with the first elastic element, presses against the drive nut in the axial direction, the pressing relationship between the locking plate and the drive nut is configured to be controllably released. When the locking plate presses against the drive nut, the bushing moves along the axial direction with the drive nut. When the pressing relationship between the locking plate and the drive nut is released, the first elastic element pushes the bushing to move relative to the drive nut in the first direction, thereby locking the parking gear by the locking unit.

2. The parking lock system according to claim 1, characterized in that, The outer circumferential surface of the drive nut has a groove, the locking plate is hinged to the bushing, the locking plate can extend at least partially into the groove, and the axial side of the locking plate can press against the axial side of the groove.

3. The parking lock system according to claim 2, characterized in that, The parking lock system includes: The second elastic element abuts against the locking plate and provides a torque to extend the locking plate into the groove; An electromagnetic unit, which can abut against the locking plate, is used to provide a torque that causes the locking plate to move away from the groove; the electromagnetic unit can be controlled to switch on and off.

4. The parking lock system according to claim 3, characterized in that, The electromagnetic unit and the power unit are configured to use different power sources, and / or The electromagnetic unit and the power unit do not share a housing.

5. The parking lock system according to claim 3, characterized in that, The electromagnetic unit includes a controllable telescopic abutment shaft, and the hinge shaft of the locking plate, which is hinged to the bushing, is located between the abutment shaft and the point where the second elastic element applies force to the locking plate.

6. The parking lock system according to claim 5, characterized in that, The electromagnetic unit is configured such that when the electromagnetic unit is energized, the abutment shaft extends, and the pressing relationship between the locking plate and the driving nut is released.

7. The parking lock system according to claim 1, characterized in that, The lead screw includes a shoulder, and the drive nut, after moving in the second direction, can abut against the shoulder; and / or The parking lock system also includes a blocking member for connecting to a fixed part of the vehicle, and the bushing can abut against the blocking member after moving along the first direction.

8. The parking lock system according to claim 1, characterized in that, The parking lock system includes a bushing position sensor, which is used to detect the position of the bushing to determine the parking status.

9. The parking lock system according to claim 1, characterized in that, The power unit includes a nut position sensor, which is used to detect the position of the drive nut on the lead screw.

10. A vehicle, characterized in that, The parking lock system includes any one of claims 1 to 9.

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