A mechanical unlocking mechanism for electronic parking

Abstract

The present invention discloses a mechanical unlocking mechanism for electronic parking, which includes a parking cam assembly, a pawl assembly, a parking gear, a cable assembly and an execution assembly; the parking cam assembly includes a parking guide shaft and a parking cam, the parking cam is sleeved on the parking guide shaft, and an arc-shaped protrusion is arranged on the outer circumference of the parking cam, so that the pawl assembly is respectively in a first position where it engages with the parking gear and a second position where it disengages with the parking gear as the parking cam rotates. One end of the cable assembly is connected to the execution assembly, and the other end is connected to the parking guide shaft. The execution assembly drives the parking guide shaft to translate through the cable assembly, driving the pawl assembly to move from the first position to the second position. The mechanical unlocking mechanism provided by the present invention provides an emergency mechanical unlocking function in the case of power failure of the parking motor, which can enable the driver to perform manual mechanical unlocking in the cab without the need for the driver to get out of the vehicle for operation; it has high safety performance and good operation comfort.

Description

Technical Field

[0001] The present invention relates to the field of parking control, and particularly to a mechanical unlocking mechanism for electronic parking. Background Art

[0002] The electronic parking mechanism of a gearbox is a mechanism that prevents a vehicle from sliding or rolling backward when the vehicle is parked on a road surface or a slope. Currently, most electronic parking mechanisms of new energy gearboxes have insufficient structural flexibility and a limited product life cycle; moreover, the mechanical unlocking mechanism is arranged at the worm of the parking motor. After the parking motor loses power, this unlocking method requires the driver to operate under the vehicle to implement mechanical unlocking, which has low safety and poor comfort. Summary of the Invention

[0003] In view of the above problems, the present invention proposes a mechanical unlocking mechanism for electronic parking in order to solve or partially solve the above problems.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] The present invention provides a mechanical unlocking mechanism for electronic parking, and the mechanical unlocking mechanism includes a parking cam assembly, a pawl assembly, a parking gear, a cable assembly, and an actuator assembly;

[0006] The parking cam assembly includes a parking guide shaft and a parking cam. The parking cam is sleeved on the parking guide shaft, and an arc-shaped protrusion is arranged on the outer circumference of the parking cam;

[0007] The pawl assembly includes a pawl and a pawl rotating shaft. One side of the end of the pawl abuts against the side of the parking cam provided with the arc-shaped protrusion, and a convex block that can be inserted into the parking gear is arranged on the other side of the end of the pawl. The pawl rotating shaft is arranged at the other end of the pawl, and the pawl can swing around the pawl rotating shaft. As the parking cam rotates and translates, the pawl is respectively in a first position where the parking gear is locked in place or a second position where the parking gear is unlocked and can rotate;

[0008] One end of the cable assembly is connected to the actuator assembly, and the other end is connected to the parking guide shaft. The cable assembly can drive the parking guide shaft to translate axially;

[0009] The actuator assembly drives the parking guide shaft to translate through the cable assembly, thereby driving the pawl to move from the first position to the second position.

[0010] Further, the cable assembly includes a cable and a guide shaft screw. Cable ball head rods are arranged at both ends of the cable. The cable ball head rods are connected to the ends of the cable and are connected to the end hole of the parking guide shaft or the actuator through the guide shaft screw sleeved on the cable.

[0011] Further, the ball head of the cable tie rod is in clearance fit with the end hole, and a certain axial space is left.

[0012] Further, the cable assembly further includes a cable roller, and the cable roller is installed on a cylindrical platform inside the gearbox housing for changing the guiding direction of the cable.

[0013] Further, the actuating assembly is a pull rod or a rocker arm structure, and the pull rod or the rocker arm structure is connected to a vehicle cable or a vehicle pull rod outside the gearbox;

[0014] The pull rod is installed in a positioning hole in the gearbox housing leading to the outside.

[0015] Further, the rocker arm structure includes a rocker arm, a thrust washer, a cable guide pulley, and a rocker arm shaft cover; one end of the cable guide pulley is in clearance fit with a hole in the gearbox housing for fixing the rocker arm structure; a radial protrusion is provided at the lower part of the cable guide pulley, and the radial protrusion is connected to the cable assembly; the rocker arm is fixed to the other end of the cable guide pulley through the thrust washer, and the rocker arm shaft cover is sleeved on the cable guide pulley between the radial protrusion and the rocker arm and is fixed to the gearbox housing.

[0016] Further, the rocker arm structure further includes a sealing ring, and the sealing ring is arranged between the cable guide pulley and the rocker arm shaft cover.

[0017] Further, the mechanical unlocking mechanism further includes an elastic component, and the elastic component includes a thrust bearing, a return spring, and a thrust bearing washer that are sequentially sleeved on the end of the parking guide shaft; the ball end of the thrust bearing abuts against the parking cam limiting plate, one end of the return spring abuts against the flat end of the thrust bearing, the other end is fixedly connected to the thrust bearing washer, the thrust bearing washer abuts against the gearbox housing, and the return spring has a pre-tightening force.

[0018] Further, the pawl shaft is fixed on both side housings of the gearbox, the pawl can rotate around the pawl shaft, the pawl assembly further includes a torsion spring, one end of the torsion spring is fixed on the gearbox housing, and the other end of the torsion spring is fixed on the pawl, so that the pawl is pre-pressed against the parking cam, and the unlocking mechanism further includes an anti-torsion spring failure component.

[0019] Further, the anti-torsion spring failure component includes a guide pin and a guide groove, the guide pin is arranged at the end of the guiding part at the end of the pawl, the guide groove is arranged on the parking cam and / or the parking cam limiting plate, and the guide pin extends into the guide groove.

[0020] The mechanical unlocking mechanism of the above-mentioned electronic parking brake has the following advantages:

[0021] The mechanical unlocking mechanism in the present invention can provide an emergency mechanical unlocking function in the case of power failure of the parking motor. The arrangement that the parking guide shaft is connected to the execution component arranged on the gearbox through the cable assembly enables the driver to perform mechanical unlocking in the cab. Since the mechanical unlocking mechanism can achieve cab unlocking under pure mechanical and non-powered conditions without the driver getting out of the vehicle, it has high safety performance and good operation comfort. The mechanical unlocking mechanism of the present invention is provided with an anti-torsion spring failure component, which can still achieve parking unlocking when the torsion spring fails, and can effectively prevent the pawl from falling into the parking gear groove in the non-parking state.

[0022] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically illustrates the specific implementation manners of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0024] Figure 1 shows a schematic structural diagram of the mechanical unlocking mechanism of the electronic parking brake in an embodiment of the present invention;

[0025] Figure 2 shows a schematic structural diagram of the cable assembly in an embodiment of the present invention;

[0026] Figure 3 shows a schematic structural diagram of the mechanical unlocking mechanism of the electronic parking brake in an embodiment of the present invention;

[0027] Figure 4 shows a schematic structural diagram of the rocker arm assembly in an embodiment of the present invention;

[0028] Figure 5 shows a schematic structural diagram of the parking cam and the pawl in the parked state in an embodiment of the present invention;

[0029] Figure 6 shows a schematic structural diagram of the parking cam and the pawl after mechanical unlocking in an embodiment of the present invention;

[0030] Figure 7 shows a schematic structural diagram of the anti-torsion spring failure component in an embodiment of the present invention.

[0031] The meanings of the reference numerals in the figure are as follows: 1. Pawl rotating shaft, 2. Torsion spring, 3. Tie rod, 4. Cable roller, 5. Cable assembly, 6. Thrust bearing washer, 7. Return spring, 8. Thrust bearing, 9. Parking cam limit plate, 10. Axial limit block, 11. Parking guide shaft, 12. Paddle spring, 13. Parking cam, 14. Roller, 15. Roller pin, 16. Pawl, 17. Parking gear, 18. Rocker arm structure, 19. Guide pin, 5-1. Cable ball head rod, 5-2. Guide shaft screw, 5-3. Cable, 18-1. Cable guide wheel, 18-2. Sealing ring, 18-3. Rocker arm rotating shaft cover, 18-4. Thrust washer, 18-5 Rocker arm. Detailed implementation manners

[0032] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0033] As Figure 1 shown, the present invention provides a mechanical unlocking mechanism for an electronic parking brake. The mechanical unlocking mechanism includes a parking cam assembly, a pawl assembly, a parking gear 17, a cable assembly 5, and an execution assembly.

[0034] Specifically, the parking cam assembly includes a parking guide shaft 11, a parking cam limit plate 9, an axial limit block 10, and a parking cam 13. The parking cam limit plate 9 is fixed on the parking guide shaft 11. The axial limit block 10 is interference-fitted on the parking guide shaft 11. The parking cam 13 is sleeved on the parking guide shaft 11 between the axial limit block 10 and the parking cam limit plate 9. The parking cam limit plate 9 can drive the parking cam 13 to rotate. The axial limit block 10 limits the position of the parking cam 13. The parking cam 13 can rotate flexibly on the parking guide shaft 11 between the axial limit block 10 and the parking cam limit plate 9.

[0035] An arc-shaped protrusion is circumferentially provided on the outer side of the parking cam 13; when the parking guide shaft 11 rotates, the parking cam limit plate 9 fixed thereon rotates accordingly, and the parking cam limit plate 9 can drive the parking cam 13 to rotate. A circumferential profile extending along the axial direction of the parking guide shaft 11 is provided on the protruding portion of the parking cam 13, and the arc-shaped protrusion is arranged on the outer side of the circumferential profile. When the circumferential profile contacts the pawl assembly, the pawl assembly is in an upward state, and the pawl 16 is in the second position where the parking gear 17 is parked out of rotation. When the arc-shaped protrusion on the circumferential profile contacts the pawl assembly, the pawl assembly is in a pressed state, and the pawl 16 is in the first position where the parking gear 17 is parked and fixed. The circumferential profile plays a role in limiting the position of the parking pawl assembly, enabling the parking pawl assembly to move within a certain range. One end of the parking guide shaft 11 in this embodiment is a flat shaft, and the other end is a round shaft. The flat shaft end of the parking guide shaft 11 penetrates the gearbox housing, the round shaft end of the parking guide shaft 11 is fixed inside the gearbox housing, the flat shaft end of the parking guide shaft 11 is connected to the parking motor, the parking motor drives the parking guide shaft to rotate, and the parking guide shaft 11 can move axially.

[0036] As Figure 1 shown, the parking cam limit plate 9 at least includes a first blade portion and a second blade portion arranged at intervals. The first blade portion and the second blade portion are respectively arranged on both sides of the protruding portion of the parking cam 13. A first spring post is provided on the side of the first blade portion facing the protruding portion, and a corresponding second spring post is provided on the protruding portion. A paddle spring 12 is sleeved on the first spring post and the second spring post; the second blade portion forms a curved claw, and the curved claw abuts against the other side of the protruding portion.

[0037] The pawl assembly includes a pawl 16 and a pawl rotating shaft 1. One side of the end of the pawl 16 abuts against the side of the parking cam 13 provided with the arc-shaped protrusion, and a convex block that can be inserted into the parking gear 17 is provided on the other side of the end of the pawl 16. The pawl rotating shaft 1 is arranged at the other end of the pawl 16, and the pawl 16 can swing around the pawl rotating shaft 1. As the parking cam 13 rotates and translates, the pawl 16 is respectively in the first position where the parking gear 17 is parked and fixed or the second position where the parking gear 17 is parked out and rotatable. The parking gear 17 is respectively in two states of being fixed or rotatable as the parking cam 13 rotates and the pawl 16 rotates along the pawl rotating shaft 1, thereby realizing parking or driving.

[0038] One end of the cable assembly 5 is connected to the actuator assembly, and the other end is connected to the parking guide shaft 11. The cable assembly 5 can drive the parking guide shaft 11 to translate axially, and the cable assembly 5 is arranged inside the gearbox housing.

[0039] The actuator assembly drives the parking guide shaft 11 to translate through the cable assembly 5, thereby driving the pawl 16 to move from the first position to the second position.

[0040] In summary, in the embodiments of the present invention, when the vehicle is in the parked state, the arc-shaped protrusion on the parking cam 13 contacts the pawl assembly. The positional relationship between the parking cam 13 and the pawl 16 in the parked state is shown in Figure 5 , the pawl 16 is in the first position for locking the parking gear 17 in place. When the parking motor cannot rotate to perform electric parking unlocking, the manual mechanical operation execution assembly can be used. The execution assembly then axially moves the parking guide shaft 11 through the cable assembly 5, and the arc-shaped protrusion no longer presses down on the pawl assembly. The pawl 16 changes from the first position for locking the parking gear 17 in place to the second position for releasing the parking gear 17 to be rotatable, thereby realizing the parking unlocking of the vehicle. The positional relationship between the parking cam 13 and the pawl 16 after mechanical unlocking is shown in Figure 6 . The mechanical unlocking mechanism of this embodiment does not require mechanical unlocking under the vehicle floor, and this mechanical unlocking mechanism is simple to operate, has a high safety level, and good comfort.

[0041] In one embodiment, as shown in Figure 2 , the cable assembly 5 includes a cable 5-3 and a guide shaft screw 5-2. Cable ball head rods 5-1 are provided at both ends of the cable 5-3. The cable ball head rods 5-1 are connected to the ends of the cable 5-3, and the connection method is riveting. The cable 5-3 is connected to the end hole of the parking guide shaft 11 or the actuator through the guide shaft screw 5-2 sleeved on the cable 5-3. Of course, the cable 5-3 can also be connected to the parking guide shaft 11 or the actuator structure in other ways, not limited to the above method.

[0042] In one embodiment, the clearance fit is between the ball head of the cable ball head rod 5-1 and the end hole, and a certain axial space is left. The clearance fit between the ball head of the cable ball head rod 5-1 and the end hole of the parking guide shaft 11 aims to keep the cable 5-3 in a relaxed state before mechanical unlocking is not used, prevent the cable 5-3 from deforming due to being in a tense state for a long time, and extend the service life of the cable 5-3.

[0043] In one embodiment, the cable assembly 5 further includes a cable roller 4. The cable roller 4 is installed on the cylindrical platform inside the gearbox housing and is used to change the guiding direction of the cable 5-3. The setting of the cable roller 4 can arbitrarily change the guiding direction of the cable 5-3, which is convenient for setting the position of the execution assembly. The cable roller 4 can be provided as one or more.

[0044] In one embodiment, as shown in Figure 1 or Figure 3 , the execution assembly is a pull rod 3 or a rocker arm structure 18. The pull rod 3 or the rocker arm structure 18 is connected to the cable 5-3 outside the gearbox housing. Moreover, the execution assembly is connected to the control member in the cab through the vehicle cable or the vehicle pull rod, and the driver can complete the mechanical unlocking action in the cab.

[0045] The pull rod 3 is installed on the positioning hole leading to the outside of the transmission case. The pull rod 3 passes through the transmission case, with one end inside the transmission case and connected to the cable assembly 5, and the other end outside the transmission case and connected to the vehicle wire or vehicle pull rod.

[0046] In one embodiment, as Figure 4 shown, the rocker arm structure 18 includes a rocker arm 18-5, a thrust washer 18-4, a cable guide pulley 18-1, and a rocker arm shaft cover 18-3. One end of the cable guide pulley 18-1 is in clearance fit with the hole on the transmission case for fixing the rocker arm structure 18. A radial protrusion is provided at the lower part of the cable guide pulley 18-1, and the radial protrusion is connected to the cable assembly 5, specifically connected to the cable 5-3. The rocker arm 18-5 is fixed to the other end of the cable guide pulley 18-1 through the thrust washer 18-4. The thrust washer 18-4 is used to position the rocker arm 18-5. The rocker arm shaft cover 18-3 is sleeved on the cable guide pulley 18-1 between the radial protrusion and the rocker arm 18-5 and fixed to the transmission case. The rocker arm 18-5 can be connected to the control part in the cab through the vehicle wire, and the driver can achieve unlocking by operating the control part in the cab.

[0047] In one embodiment, the rocker arm 18 structure further includes a sealing ring 18-2. The sealing ring 18-2 is arranged between the cable guide pulley 18-1 and the rocker arm shaft cover 18-3, and the sealing ring 18-2 plays a sealing role for the rocker arm shaft cover 18-3.

[0048] In one embodiment, as Figure 1 shown, the mechanical unlocking mechanism further includes an elastic component. The elastic component includes a thrust bearing 8, a return spring 7, and a thrust bearing washer 6 that are sequentially sleeved on the end of the parking guide shaft 11. The ball end of the thrust bearing 8 abuts against the parking cam limiting plate 9. One end of the return spring 7 abuts against the flat end of the thrust bearing 8, and the other end is fixedly connected to the thrust bearing washer 6. The thrust bearing washer 6 abuts against the transmission case. The return spring 7 has a pre-tightening force. An oil seal is provided at the place where the round shaft end of the parking guide shaft 11 contacts the transmission case to play an isolating role. Due to the pre-tightening force of the return spring 7, the elastic component is next to the transmission case. When the parking mechanism is mechanically unlocked, the parking cam assembly axially moves towards the round shaft end of the parking guide shaft 11, and the elastic component is further compressed towards the transmission case.

[0049] In one embodiment, the pawl rotating shaft 1 is fixed on the two side boxes of the gearbox. The pawl 16 can rotate around the pawl rotating shaft 1. The pawl assembly further includes a torsion spring 2. One end of the torsion spring 2 is fixed on the gearbox box body, and the other end of the torsion spring 2 is fixed on the pawl 16, so that the pawl 16 is pre-pressed against the parking cam 13. Under the action of the torsion spring 2, it is ensured that the pawl 16 always abuts against the parking cam 13. In order to improve the connection reliability between the pawl 16 and the parking cam 13, reduce the friction and wear at the joint between the upper part of the pawl 16 and the parking cam 13, and improve its service life, a groove is provided in the upper part of the pawl 16. The roller 14 is fixed in the groove through the roller pin 15. The roller 14 contacts the parking cam 13. A convex block is provided at the lower part of the pawl 16 and can be engaged with the parking gear 17.

[0050] When the parking mechanism is in the parked state, the pawl 16 is pressed down by the parking cam 13, so that the convex block at the lower part of the pawl 16 is engaged with the parking gear 17 to realize parking. One side of the pawl 16 is sleeved on the pawl rotating shaft 1. The pawl rotating shaft 1 is fixed on the two side boxes of the gearbox. The pawl 16 can rotate around the pawl rotating shaft 1. One end of the torsion spring 2 is fixed on the gearbox box body, and the other end is fixed on the pawl 16. The torsion spring 2 has a certain pre-tightening force during installation. The pre-tightening force makes the pawl 16 always lift upward, so that the pawl 16 is pre-pressed against the parking cam 13. The roller 14 can roll radially along the roller pin 15 to reduce the friction between the parking cam 13 and the pawl 16. The roller 14 contacts the circumferential profile or arc-shaped protrusion on the parking cam 13. The unlocking mechanism further includes an anti-torsion spring failure component.

[0051] In one embodiment, as Figure 7 shown, the anti-torsion spring failure component includes a guide pin 19 and a guide groove. The guide pin 19 is arranged at the end of the guide part at the end of the pawl 16. The guide groove is arranged on the parking cam 13 and / or the parking cam limit plate 9. The guide pin 19 extends into the guide groove. The guide groove provides a guiding function for lifting the pawl 16 during emergency unlocking. When the torsion spring 2 fails, since the pawl assembly loses the action of the pre-tightening force of the torsion spring 2, when unlocking the parking, the convex block arranged at the lower part of the pawl 16 cannot be separated from the engaged state with the parking gear 17, and thus parking unlocking cannot be realized.

[0052] In this embodiment of the present invention, through the design of the guide pin 19 and the guide groove, the movable connection between the pawl 16 and the parking cam 13 can be realized. Even if the torsion spring 2 fails, due to the rotation of the parking cam 13, the pawl 16 is lifted by the guide pin 19, so that the convex block at the lower part of the pawl 16 is separated from the parking gear 17, and thus parking unlocking is realized. In the non-parked state, the guide pin 19 is attached to the bottom of the guide groove of the parking cam 13 to prevent the pawl 16 from falling into the tooth groove of the parking gear 17. The anti-torsion spring failure component in this embodiment overcomes the problem of abnormal unlocking caused by faults such as the torsion spring 2.

[0053] In summary, the present invention provides a mechanical unlocking mechanism for electronic parking. The mechanical unlocking mechanism includes a parking cam assembly, a pawl assembly, a parking gear, a cable assembly, and an actuator assembly. The parking cam assembly includes a parking guide shaft, a parking cam limit plate, an axial limit block, and a parking cam. The parking cam limit plate is fixed on the parking guide shaft. The axial limit block is interference-fitted on the parking guide shaft. The parking cam is sleeved on the parking guide shaft between the axial limit block and the parking cam limit plate. An arc-shaped protrusion is provided on the outer circumference of the parking cam. The pawl assembly includes a pawl and a pawl rotating shaft. One side of the end of the pawl abuts against the side of the parking cam provided with the arc-shaped protrusion. The other side of the end of the pawl is provided with teeth that can be inserted into the parking gear. The pawl rotating shaft is provided at the other end of the pawl. The pawl can swing around the pawl rotating shaft. As the parking cam rotates and translates, the pawl is respectively in a first position where the parking gear is locked and fixed or a second position where the parking gear is unlocked and rotatable. One end of the cable assembly is connected to the actuator assembly, and the other end is connected to the parking guide shaft. The cable assembly can drive the parking guide shaft to translate axially. The actuator assembly drives the parking guide shaft to translate through the cable assembly, thereby driving the pawl to move from the first position to the second position. The mechanical unlocking mechanism provided by the present invention provides an emergency mechanical unlocking function in the case of power failure of the parking motor. The parking guide shaft is connected to the actuator assembly provided on the transmission through the cable assembly, and the driver can achieve mechanical unlocking in the cab. The mechanical unlocking mechanism can achieve manual unlocking in the cab under pure mechanical and non-power conditions without the driver getting out of the vehicle. It has high safety performance and good operation comfort.

[0054] As described above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes, substitutions, or improvements, and all should be covered within the protection scope of the present invention.

[0055] In the specification provided herein, a large number of specific details are set forth. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies have not been shown in detail so as not to obscure the understanding of this specification.

Claims

1. A mechanical unlocking mechanism for electronic parking, characterized in that, The mechanical unlocking mechanism includes a parking cam assembly, a pawl assembly, a parking gear, a cable assembly, and an actuator assembly; The parking cam assembly includes a parking guide shaft and a parking cam. The parking cam is sleeved on the parking guide shaft, and an arc-shaped protrusion is arranged on the outer circumference of the parking cam; The pawl assembly includes a pawl and a pawl rotating shaft. One side of the end of the pawl abuts against the side of the parking cam provided with the arc-shaped protrusion, and a convex block that can be inserted into the parking gear is arranged on the other side of the end of the pawl. The pawl rotating shaft is arranged at the other end of the pawl, and the pawl can swing around the pawl rotating shaft. As the parking cam rotates and translates, the pawl is respectively in a first position where the parking gear is locked in place or a second position where the parking gear is unlocked and can rotate; One end of the cable assembly is connected to the actuator assembly, and the other end is connected to the parking guide shaft. The cable assembly can drive the parking guide shaft to translate axially; The actuator assembly drives the parking guide shaft to translate through the cable assembly, thereby driving the pawl to move from the first position to the second position; The cable assembly includes a cable and a guide shaft screw. Cable ball head rods are arranged at both ends of the cable. The cable ball head rods are connected to the ends of the cable and are connected to the parking guide shaft or the end hole of the actuator assembly through the guide shaft screw sleeved on the cable. The actuator assembly is a pull rod or a rocker arm structure. The pull rod or the rocker arm structure is connected to the vehicle cable or the vehicle pull rod outside the transmission; The pull rod is installed in the positioning hole on the transmission case leading to the outside.

2. The mechanical unlocking mechanism according to claim 1, characterized in that, The ball head of the cable ball head rod has a clearance fit with the end hole and leaves a certain axial space.

3. The mechanical unlocking mechanism according to claim 1, characterized in that, The cable assembly further includes a cable roller. The cable roller is installed on the cylindrical platform inside the transmission case and is used to change the guiding direction of the cable.

4. The mechanical unlocking mechanism according to claim 1, characterized in that, The rocker arm structure includes a rocker arm, a thrust washer, a cable guide wheel, and a rocker arm shaft cover; One end of the cable guide wheel has a clearance fit with the hole on the transmission case and is used to fix the rocker arm structure; A radial protrusion is arranged at the lower part of the cable guide wheel, and the radial protrusion is connected to the cable assembly; The rocker arm is fixed at the other end of the cable guide wheel through the thrust washer. The rocker arm shaft cover is sleeved on the cable guide wheel between the radial protrusion and the rocker arm and is fixed on the transmission case.

5. The mechanical unlocking mechanism according to claim 4, wherein, The rocker arm structure further includes a sealing ring. The sealing ring is arranged between the cable guide wheel and the rocker arm shaft cover.

6. The mechanical unlocking mechanism according to claim 1, characterized in that, The mechanical unlocking mechanism further includes an elastic component. The elastic component includes a thrust bearing, a return spring, and a thrust bearing washer that are sequentially sleeved on the end of the parking guide shaft; The ball end of the thrust bearing abuts against the parking cam limit plate. One end of the return spring abuts against the flat end of the thrust bearing, and the other end is fixedly connected to the thrust bearing washer. The thrust bearing washer abuts against the transmission case, and the return spring has a pre-tightening force.

7. The mechanical unlocking mechanism according to any one of claims 1-6, characterized in that, The pawl rotating shaft is fixed on the two side boxes of the gearbox. The pawl can rotate around the pawl rotating shaft. The pawl assembly further includes a torsion spring. One end of the torsion spring is fixed on the gearbox box body, and the other end of the torsion spring is fixed on the pawl, so that the pawl is pre-pressed against the parking cam, and the unlocking mechanism further includes an anti-torsion spring failure assembly.

8. The mechanical unlocking mechanism according to claim 7, wherein, The anti-torsion spring failure assembly includes a guide pin and a guide groove. The guide pin is arranged at the end of the guiding part at the end of the pawl, and the guide groove is arranged on the parking cam and / or the parking cam limit plate, and the guide pin extends into the guide groove.

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