Mechanical unlocking mechanism for electronic parking

Abstract

The present invention discloses a mechanical unlocking mechanism for electronic parking, comprising a parking cam assembly, a pawl assembly, a pull rod assembly and a parking gear; the parking cam assembly comprises a parking guide shaft and a parking cam, the parking cam is sleeved on the parking guide shaft, at least a first protrusion and a second protrusion are provided on both sides of the parking cam, and a connecting portion is provided on the second protrusion; the pull rod assembly is connected to the parking cam through the connecting portion, and the pull rod assembly pulls the second protrusion to drive the parking cam to rotate; according to the pawl assembly being respectively in a first position parked with the parking gear and a second position parked out with the parking gear as the parking cam rotates, the parking gear can be fixed or rotated. The mechanical unlocking mechanism provided by the present invention provides an emergency mechanical unlocking function when the parking motor is powered off, so that the driver can realize manual mechanical unlocking in the cab without the need for the driver to get off the vehicle for operation; the safety performance is high and the operation comfort is good.

Description

Technical Field

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

[0002] The electronic parking mechanism of the transmission is a mechanism that prevents the vehicle from sliding or rolling backward when the vehicle is parked on the road or on a slope. At present, the structural flexibility of most electronic parking mechanisms of new energy transmissions is insufficient, and the product life cycle is limited; and 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 is low in safety and poor in comfort. Summary of the invention

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

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

[0005] The present invention provides a mechanical unlocking mechanism for electronic parking, the mechanical unlocking mechanism comprising a parking cam assembly, a pawl assembly, a pull rod assembly and a parking gear;

[0006] The parking cam assembly comprises a parking guide shaft and a parking cam, wherein the parking cam is sleeved on the parking guide shaft, and at least a first protrusion and a second protrusion are provided on both sides of the parking cam, and a connecting portion is provided on the second protrusion;

[0007] The pawl assembly comprises a pawl, one end of which abuts against the first protrusion;

[0008] The pull rod assembly is connected to the parking cam via the connecting portion, and the pull rod assembly pulls the second protrusion to drive the parking cam to rotate;

[0009] The parking gear can be fixed or rotated according to the pawl assembly being respectively in a first position parked with the parking gear and a second position parked away from the parking gear as the parking cam rotates.

[0010] Furthermore, the connecting portion is a groove, the groove is a through groove or a blind groove, and the shape of the groove is arc, circular or polygonal.

[0011] Further, the pull rod assembly includes a connecting rod, a pin and a retaining ring;

[0012] One end of the connecting rod is installed in the groove through the pin, and the outer side of the pin in contact with the connecting rod is provided with the retaining ring for fixing the pin;

[0013] The parking cam is driven to rotate by pulling the connecting rod.

[0014] Furthermore, the pull rod assembly also includes a pull rod and a sealing ring;

[0015] The pull rod is installed on the guide hole leading to the outside of the gearbox case with a clearance fit, and the sealing ring is provided between the pull rod and the gearbox case; one end of the pull rod is movably connected to the connecting rod through the pin, and the retaining ring is provided on the outer side where the pin contacts the connecting rod and the pull rod, which is used to fix the pin.

[0016] Further, the first protrusion is provided with an arc-shaped protrusion in the circumferential direction, the arc-shaped protrusion is in contact with the pawl assembly, and the parking cam assembly further includes an axial limit block, a parking cam limit plate, and a paddle spring;

[0017] The parking cam limit plate is fixed on the parking guide shaft, the axial limit block is interference sleeved 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, and the parking cam limit plate can drive the parking cam to rotate;

[0018] The paddle spring provides a return force after mechanical unlocking and a continuous power during parking.

[0019] Furthermore, the pawl assembly also includes a roller and a roller pin;

[0020] A groove is arranged at the end of the pawl, the roller is fixed in the groove by the roller pin, the roller abuts against the first protrusion, and a convex block is arranged at the lower part of the pawl to mesh with the parking gear.

[0021] Furthermore, the pawl assembly further comprises a pawl shaft and a torsion spring, wherein the pawl shaft is arranged on one side of the pawl, and the pawl can rotate and swing around the pawl shaft;

[0022] One side of the pawl is sleeved on the pawl shaft, and the pawl shaft is fixed on the two side housings of the gearbox, and the pawl can rotate around the pawl shaft; one end of the torsion spring is fixed on the gearbox housing, and the other end is fixed on the pawl, so that the pawl is pre-tightened with the parking cam.

[0023] Furthermore, the mechanical unlocking mechanism also includes an anti-torsion spring failure component, which includes a guide pin and a guide groove, wherein the guide pin is arranged at the end of the guide portion 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.

[0024] The mechanical unlocking mechanism of the electronic parking brake has the following advantages:

[0025] The mechanical unlocking mechanism in the present invention can provide an emergency mechanical unlocking function when the parking motor is powered off. The parking cam is connected to the control component in the cab through a pull rod assembly, so that the driver can mechanically unlock the car in the cab. Since the mechanical unlocking mechanism can achieve pure mechanical unlocking in the cab without power, the driver does not need to get off the vehicle to operate, so the safety performance is high and the operating comfort is good. The mechanical unlocking mechanism of the present invention can still achieve parking unlocking when the torsion spring fails by setting an anti-torsion spring failure assembly, and can effectively prevent the pawl from falling into the parking gear slot in the non-parking state.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the structure of a mechanical unlocking mechanism for electronic parking in one embodiment of the present invention is shown;

[0029] Figure 2 A schematic diagram of the structure of a parking cam and a pawl in a parking state in one embodiment of the present invention is shown;

[0030] Figure 3 A schematic diagram of the structure of the parking cam and the pawl after mechanical unlocking in one embodiment of the present invention is shown.

[0031] The meanings of the reference numerals in the figure are as follows: 1. parking gear, 2. pawl, 3. pawl shaft, 4. torsion spring, 5. pull rod, 6. pin, 7. connecting rod, 8. retaining ring, 9. axial limit block, 10. parking guide shaft, 11. parking cam limit plate, 12. paddle spring, 13. parking cam, 14. roller, 15. roller pin. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying 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 in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0033] like Figure 1 As shown, the present invention provides a mechanical unlocking mechanism for electronic parking, which includes a parking cam assembly, a pawl assembly, a pull rod assembly and a parking gear 1.

[0034] Specifically, the parking cam assembly includes a parking guide shaft 10 and a parking cam 13. The parking cam 13 is sleeved on the parking guide shaft 10. At least a first protrusion and a second protrusion are provided on both sides of the parking cam 13, and a connecting portion is provided on the second protrusion. One end of the parking guide shaft 10 is a flat shaft and the other end is a round shaft. The parking guide shaft 10 passes through the gearbox housing. The flat shaft end of the parking guide shaft 10 is connected to the parking motor, and the parking motor drives the parking guide shaft 10 to rotate.

[0035] The pawl assembly comprises a pawl 2, one end of which abuts against the first protrusion.

[0036] The pull rod assembly is connected to the parking cam 13 via a connecting portion, and the pull rod assembly pulls the second protrusion to drive the parking cam 13 to rotate.

[0037] The parking gear 1 can be fixed or rotated according to the pawl assembly being respectively in a first position parked with the parking gear 1 and a second position parked with the parking gear 1 as the parking cam 13 rotates. As the parking cam 13 rotates, different positions of the first protrusion abut against the pawl assembly, so that the pawl assembly is in the first position parked with the parking gear 1 or the second position parked with the parking gear 1.

[0038] In summary, the mechanical unlocking structure in the embodiment of the present invention can provide a mechanical unlocking method when the parking motor loses power and cannot realize parking unlocking, and the pull rod assembly drives the parking cam 13 to rotate, so that the position relationship between the parking pawl assembly and the parking gear 1 changes from the first position of parking to the second position of parking, thereby realizing parking unlocking. The mechanical unlocking mechanism of this embodiment does not need to be mechanically unlocked under the vehicle, and the mechanical unlocking mechanism is simple to operate, highly safe, and comfortable.

[0039] In one embodiment, the connecting portion is a groove, the groove is a through groove or a blind groove, and the shape of the groove is arc, circular or polygonal.

[0040] In one embodiment, Figure 2 As shown, the pull rod assembly includes a connecting rod 7, a pin 6 and a retaining ring 8.

[0041] One end of the connecting rod 7 is installed in the groove through the pin 6, and the connecting rod 7 is movably connected to the parking cam 13. A retaining ring 8 is provided on the outer side where the pin 6 contacts the connecting rod 7 to fix the pin 6.

[0042] The parking cam 13 is driven to rotate by pulling the connecting rod 7 .

[0043] In one embodiment, the tie rod assembly further includes a tie rod 5 and a sealing ring.

[0044] The pull rod 5 is installed on the guide hole leading to the outside of the gearbox housing, with clearance fit, and a sealing ring is provided between the pull rod 5 and the gearbox housing; one end of the pull rod 5 is movably connected to the connecting rod 7 through the pin 6, and a retaining ring is provided on the outer side where the pin 6 contacts the connecting rod 7 and the pull rod 5, which is used to fix the pin 6. One end of the pull rod 5 is movably connected to the connecting rod 7 through the pin 6, and the other end of the pull rod 5 is connected to the control part in the cab through the vehicle pull wire or the vehicle pull rod; the driver pulls the pull rod 5 through the control part in the cab, thereby realizing the rotation of the parking cam 13 and realizing mechanical unlocking.

[0045] In one embodiment, the first protrusion is provided with an arc-shaped protrusion in the circumferential direction, and the arc-shaped protrusion contacts the pawl assembly. When the arc-shaped protrusion contacts the pawl assembly, the pawl assembly is pressed down and meshes with the parking gear 1 to achieve parking. At this time, the position structure of the parking cam 13 and the pawl 2 is as follows: Figure 2 When the first protrusion other than the arc-shaped protrusion abuts against the pawl assembly, the pawl assembly rises and separates from the parking gear 1 to achieve parking. At this time, the parking cam 13 and the pawl 2 are positioned as shown in the structure Figure 3 The parking cam assembly further includes an axial limit block 9 , a parking cam limit plate 11 , and a paddle spring 12 .

[0046] The parking cam limit plate 11 is fixed on the parking guide shaft 10, the axial limit block 9 is interference-fitted on the parking guide shaft 10, the parking cam 13 is sleeved on the parking guide shaft 10 between the axial limit block 9 and the parking cam limit plate 11, and the parking cam limit plate 11 can drive the parking cam 13 to rotate.

[0047] The paddle spring provides the return force after mechanical unlocking and the continuous power when parked. Figure 1 As shown, the parking cam limit plate 11 at least includes a first blade portion and a second blade portion that are spaced apart, and the first blade portion and the second blade portion are respectively arranged on both sides of the first protrusion of the parking cam 13, a first spring column is provided on the side of the first blade portion facing the first protrusion, a corresponding second spring column is provided on the first protrusion, and a paddle spring 12 is sleeved on the first spring column and the second spring column; the second blade portion is formed with a curved claw, which abuts against the other side of the first protrusion.

[0048] In one embodiment, the pawl assembly further includes a roller 14 and a roller pin 15 .

[0049] Specifically, a groove is provided at the end of the pawl 2, and the roller 14 is fixed in the groove by a roller pin 15. The roller 14 abuts against the first protrusion, and a bump is provided at the lower part of the pawl 2 to engage with the parking gear 1. The roller 14 can roll radially along the roller pin 15, and the design of the roller 14 is to reduce the friction and wear of the joint between the upper part of the pawl 2 and the parking cam 13, thereby increasing its service life.

[0050] In one embodiment, the pawl assembly further includes a pawl shaft 3 and a torsion spring 4 . The pawl shaft 3 is disposed on one side of the pawl 2 , and the pawl 2 can swing around the pawl shaft 3 .

[0051] One side of the pawl 2 is sleeved on the pawl shaft 3, and the pawl shaft 3 is fixed on the two side housings of the gearbox. The pawl 2 can rotate around the pawl shaft 3. One end of the torsion spring 4 is fixed on the gearbox housing, and the other end is fixed on the pawl 2, so that the pawl 2 is pre-compressed with the parking cam 13. Under the action of the torsion spring 4, the pawl 2 is always in contact with the parking cam 13.

[0052] In one embodiment, the mechanical unlocking mechanism further includes an anti-torsion spring failure assembly, which includes a guide pin and a guide slot. The guide pin is arranged at the end of the guide portion of the end of the pawl 2, and the guide slot is arranged on the parking cam 13 and / or the parking cam limit plate 11. The guide pin extends into the guide slot, and the guide slot provides a guiding function for lifting the pawl 2 during emergency unlocking. When the torsion spring 4 fails, since the pawl assembly loses the effect of the preload force of the torsion spring 4, when the parking unlocking is performed, the protrusion arranged at the lower part of the pawl 2 cannot be separated from the meshing state with the parking gear 1, and thus the parking unlocking cannot be achieved.

[0053] In this embodiment of the present invention, the design of the guide pin and the guide groove can realize the movable connection between the pawl 2 and the parking cam 13. Even if the torsion spring 4 fails, due to the rotation of the parking cam 13, the pawl 2 is driven to lift up through the guide pin, so that the protrusion at the bottom of the pawl 2 is separated from the parking gear 1, thereby realizing parking unlocking. In the non-parking state, the guide pin is attached to the bottom of the guide groove of the parking cam 13 to prevent the pawl 2 from falling into the tooth groove of the parking gear 1. The anti-torsion spring failure component in this embodiment overcomes the problem of normal unlocking caused by failures of the torsion spring 4.

[0054] In summary, the present invention provides a mechanical unlocking mechanism for electronic parking, which includes a parking cam assembly, a pawl assembly, a pull rod assembly and a parking gear; the parking cam assembly includes a parking guide shaft and a parking cam, the parking cam is sleeved on the parking guide shaft, at least a first protrusion and a second protrusion are provided on both sides of the parking cam, and a connecting portion is provided on the second protrusion; the pawl assembly includes a pawl, one end of the pawl assembly abuts against the first protrusion; the pull rod assembly is connected to the parking cam through the connecting portion, and the pull rod assembly pulls the second protrusion to drive the parking cam to rotate; the parking gear, according to the pawl assembly being in a first position parked in with the parking gear and a second position parked out with the parking gear as the parking cam rotates, the parking gear can be fixed or rotated. The mechanical unlocking mechanism provided by the present invention provides an emergency mechanical unlocking function when the parking motor is powered off. The parking cam is connected to the control component in the cab through a pull rod assembly, so that the driver can achieve mechanical unlocking in the cab. The mechanical unlocking mechanism can achieve manual unlocking in the cab under pure mechanical and no power supply, without the need for the driver to get off the vehicle to operate; it has high safety performance and good operating comfort.

[0055] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes, replacements or improvements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0056] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

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 pull rod assembly and a parking gear; The parking cam assembly comprises a parking guide shaft and a parking cam, wherein the parking cam is sleeved on the parking guide shaft, and at least a first protrusion and a second protrusion are provided on both sides of the parking cam, and a connecting portion is provided on the second protrusion; one end of the parking guide shaft is a flat shaft, and the other end of the parking guide shaft is a round shaft, the parking guide shaft passes through the gearbox housing, and the flat shaft end of the parking guide shaft is connected to the parking motor, and the parking motor drives the parking guide shaft to rotate; The pawl assembly comprises a pawl, one end of which abuts against the first protrusion; The pull rod assembly is connected to the parking cam via the connecting portion, and the pull rod assembly pulls the second protrusion to drive the parking cam to rotate; The parking gear is capable of being fixed or rotated according to the pawl assembly being respectively in a first position parked with the parking gear and a second position parked out of the parking gear as the parking cam rotates; The pawl assembly further includes a pawl shaft and a torsion spring, wherein the pawl shaft is arranged on one side of the pawl, and the pawl can rotate and swing around the pawl shaft; One side of the pawl is sleeved on the pawl shaft, and the pawl shaft is fixed on the two side housings of the gearbox, and the pawl can rotate around the pawl shaft; one end of the torsion spring is fixed on the gearbox housing, and the other end is fixed on the pawl, so that the pawl is pre-pressed with the parking cam; The mechanical unlocking mechanism also includes an anti-torsion spring failure component, which includes a guide pin and a guide groove. The guide pin is arranged at the end of the guide part at the end of the pawl. 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.

2. The mechanical unlocking mechanism according to claim 1, characterized in that: The connecting portion is a groove, the groove is a through groove or a blind groove, and the shape of the groove is arc, circular or polygonal.

3. The mechanical unlocking mechanism according to claim 2, characterized in that: The tie rod assembly comprises a connecting rod, a pin and a retaining ring; One end of the connecting rod is installed in the groove through the pin, and the outer side of the pin in contact with the connecting rod is provided with the retaining ring for fixing the pin; The parking cam is driven to rotate by pulling the connecting rod.

4. The mechanical unlocking mechanism according to claim 3, characterized in that: The pull rod assembly also includes a pull rod and a sealing ring; The pull rod is installed on the guide hole leading to the outside of the gearbox case with a clearance fit, and the sealing ring is provided between the pull rod and the gearbox case; one end of the pull rod is movably connected to the connecting rod through the pin, and the retaining ring is provided on the outer side where the pin contacts the connecting rod and the pull rod, which is used to fix the pin.

5. The mechanical unlocking mechanism according to claim 1, characterized in that: The first protrusion is provided with an arc-shaped protrusion in the circumferential direction, and the arc-shaped protrusion contacts the pawl assembly. The parking cam assembly further includes an axial limit block, a parking cam limit plate, and a paddle spring; The parking cam limit plate is fixed on the parking guide shaft, the axial limit block is interference sleeved 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, and the parking cam limit plate can drive the parking cam to rotate; The paddle spring provides a return force after mechanical unlocking and a continuous power during parking.

6. The mechanical unlocking mechanism according to any one of claims 1 to 4, characterized in that: The pawl assembly also includes a roller and a roller pin; A groove is arranged at the end of the pawl, the roller is fixed in the groove by the roller pin, the roller abuts against the first protrusion, and a convex block is arranged at the lower part of the pawl to mesh with the parking gear.

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