CN212509395U

CN212509395U - Cam mechanism and parking device

Info

Publication number: CN212509395U
Application number: CN202020620465.8U
Authority: CN
Inventors: 陈嗣国; 李东
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2021-02-09
Anticipated expiration: 2030-04-22

Abstract

The utility model relates to a cam mechanism and parking device. The ratchet wheel comprises a ratchet wheel, a pawl and a reset structure, wherein a plurality of limit grooves are arranged at intervals on the outer peripheral side of the ratchet wheel, a protrusion is arranged on the pawl, the reset structure is used for applying reset acting force to the pawl, the cam mechanism is used for driving the pawl to swing so as to enable the pawl to be in stop contact with the ratchet wheel, the cam mechanism comprises a rotating shaft structure, a first elastic piece, a cam piece and a pushing structure, the cam piece is rotatably assembled with the rotating shaft structure, and the first elastic piece is used for applying reset acting force to the cam piece when the cam piece rotates around the rotating shaft structure; the rotating shaft structure is also provided with a locking surface, and the locking surface is used for stopping and limiting with the pushing structure so as to lock the rotating shaft structure after the rotating shaft structure rotates for a set angle. The utility model discloses a cam mechanism, parking device have avoided the problem of parking locking illusion, have ensured the validity of parking locking, have removed the restriction to the parking motor lectotype.

Description

Cam mechanism and parking device

Technical Field

The utility model relates to a vehicle parking technical field especially relates to a cam mechanism and parking device.

Background

The parking device is mainly used for locking the automobile transmission, so that the automobile can be parked in situ. At present, the parking device of the electric automobile mainly adopts a self-locking motor design with a reverse rotation prevention mechanism, such as a worm gear transmission mechanism, a screw nut transmission mechanism and the like. Although the parking device can achieve a good parking effect, the parking device has the problems of complex structure and difficult type selection of the parking motor.

In order to avoid the above problems, the prior art also adopts a structural design of a ratchet wheel, a pawl and a cam, namely, a plurality of grooves are arranged at intervals on the outer peripheral side of the ratchet wheel, protrusions for inserting into the grooves are arranged on the pawl, and the cam can push the protrusions on the pawl into the grooves in the rotating process, so that the ratchet wheel and the pawl are locked, and the parking of a vehicle is realized.

However, in the process of parking locking, the situation that the protrusion cannot be accurately aligned with the groove often occurs, at the moment, the protrusion can be pressed on the outer peripheral side of the ratchet wheel, the cam cannot rotate in place due to the reverse action of the pawl, and therefore a parking locking false image is caused, a driver is misguided, and even a vehicle sliding problem occurs in a serious situation, and traffic accidents are caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a parking device for there is parking locking illusion parking device among the solution prior art, the technical problem of incident appears easily. The utility model also provides a cam mechanism who is applied to above-mentioned parking device.

In order to achieve the above object, the utility model provides a cam mechanism adopts following technical scheme:

a cam mechanism comprises a rotating shaft structure, a first elastic component, a cam component and a pushing structure, wherein the cam component is rotatably assembled with the rotating shaft structure, and the first elastic component is used for applying a resetting acting force to the cam component when the cam component rotates around the rotating shaft structure; the rotating shaft structure is also provided with a locking surface, and the locking surface is used for stopping and limiting with the pushing structure so as to lock the rotating shaft structure after the rotating shaft structure rotates for a set angle.

Furthermore, the rotating shaft structure is also provided with a limiting arm, and the limiting arm is used for being limited by the cam piece in a blocking manner so as to limit the reset stroke of the cam piece.

Further, the rotating shaft structure comprises a rotating shaft part and a limiting part, the limiting part is fixedly assembled on the rotating shaft part, and the limiting arm is arranged on the limiting part.

Further, the locking surface is arranged on the limiting member and/or the rotating shaft part.

Further, the locking surface is an inclined surface, and the inclination angle of the locking surface is 30-60 degrees.

Furthermore, the rotating shaft structure is provided with a protruding part, and the two opposite sides of the protruding part are provided with the locking surfaces.

Further, the pushing structure is an elastic telescopic structure.

Further, the elastic telescopic structure includes cover seat, second elastic component and kicking block, be provided with the holding tank in the cover seat, the kicking block inlays the notch department at the holding tank, the second elastic component is installed in the holding tank, the second elastic component is used for ejecting holding tank with the kicking block part to make kicking block and locking surface top press contact.

Furthermore, the outer peripheral surface of the top block is provided with a rolling curved surface.

The utility model also provides a parking device adopts following technical scheme:

a parking device comprises a ratchet wheel, a pawl and a reset structure, wherein a plurality of limit grooves are arranged on the outer peripheral side of the ratchet wheel at intervals, protrusions which are inserted into the limit grooves are arranged on the pawl, the reset structure is used for applying reset acting force to the pawl so that the protrusions can be separated from the limit grooves in a non-parking state, the parking device also comprises a cam mechanism, the cam mechanism is used for driving the pawl to swing so that the pawl is in blocking contact with the ratchet wheel, the cam mechanism comprises a rotating shaft structure, a first elastic piece, a cam piece and a pushing structure, the cam piece is rotatably assembled with the rotating shaft structure, and the first elastic piece is used for applying reset acting force to the cam piece when the cam piece rotates around the rotating shaft structure; the rotating shaft structure is also provided with a locking surface, and the locking surface is used for stopping and limiting with the pushing structure so as to lock the rotating shaft structure after the rotating shaft structure rotates for a set angle.

Further, the pushing structure is an elastic telescopic structure.

The embodiment of the utility model provides a cam mechanism, a parking device compare with prior art, and its beneficial effect lies in: through adopting the utility model discloses a cam mechanism, parking device when needs parking, rotate through drive pivot structure, at this moment, the cam piece can push away the pawl and make the arch on the pawl move to ratchet one side owing to the effect that receives first elastic component can rotate along with pivot structure is synchronous, rotates in-process cam piece. When the protrusions on the pawl can be accurately aligned with the grooves on the ratchet wheel, the protrusions can be inserted into the corresponding grooves, so that the rotation stopping and limiting of the ratchet wheel are realized, namely the parking locking of a vehicle is realized; when the protrusion on the pawl can not align with the groove on the ratchet wheel, the protrusion can be in abutting contact with the outer peripheral surface of the ratchet wheel, at the moment, the cam piece can be subjected to reverse acting force of the pawl and stops rotating, the rotating shaft structure can continue to rotate until the rotating shaft structure rotates to a set angle position, the first elastic piece can automatically store energy in the process, after the rotating shaft structure rotates in place, the pushing structure can push the locking surface on the rotating shaft structure, due to the blocking effect of the pushing structure and the locking surface, the rotating shaft structure can be locked at the set angle position, and the cam piece can also press the pawl on the outer peripheral surface of the ratchet wheel under the action of the first elastic piece, so that parking locking of the vehicle is achieved.

The utility model discloses a cam mechanism, parking device can still realize the locking of splining of ratchet under the circumstances that the recess on arch on the pawl and the ratchet can not the accurate alignment to avoided the problem of parking locking illusion, ensured the validity of parking locking, improved the security of driving, eliminated latent traffic safety hidden danger. Additionally, the utility model discloses a parking device does not have the requirement to the parking motor, can be in order to adopt the parking motor that does not have self-locking function, has removed the restriction to the parking motor lectotype.

Drawings

Fig. 1 is a schematic view of an overall structure of a parking device according to an embodiment of the present invention;

fig. 2 is a schematic view of a cam mechanism of the parking device according to the embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a pushing structure of the parking device according to an embodiment of the present invention;

fig. 4 is a top pushing structure and a locking surface top pressure locking schematic diagram of the parking device according to the embodiment of the present invention.

In the figure, 1-cam mechanism, 2-pawl, 3-ratchet wheel, 4-pawl rotating shaft, 5-resetting structure, 6-bulge, 7-limiting groove, 8-rotating shaft part, 9-cam part, 10-limiting part, 11-limiting sleeve, 12-first elastic part, 13-limiting arm, 14-pushing structure, 15-protruding part, 16-sleeve seat, 17-second elastic part, 18-top block and 19-locking surface.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 4, a parking device according to a preferred embodiment of the present invention is provided. The parking device comprises a ratchet wheel 3, a pawl 2 and a reset structure 5, wherein a plurality of limiting grooves 7 are arranged at intervals on the outer peripheral side of the ratchet wheel 3, a protrusion 6 used for being inserted into the limiting groove 7 is arranged on the pawl 2, the reset structure 5 is used for applying reset acting force to the pawl 2 so that the protrusion 6 is separated from the limiting groove 7 in a non-parking state, the parking device further comprises a cam mechanism 1, the cam mechanism 1 is used for driving the pawl 2 to swing so that the pawl 2 and the ratchet wheel 3 are in blocking contact, the cam mechanism 1 comprises a rotating shaft structure, a first elastic part 12, a cam part 9 and a pushing structure 14, the cam part 9 is rotatably assembled with the rotating shaft structure, and the first elastic part 12 is used for applying reset acting force to the cam part 9 when the cam part 9 rotates around the rotating shaft structure; the rotating shaft structure is further provided with a locking surface 19, and the locking surface 19 is used for stopping and limiting with the pushing structure 14 so as to lock the rotating shaft structure after the rotating shaft structure rotates for a set angle.

Specifically, as shown in fig. 1, in the present embodiment, the ratchet 3 is fixed to the output shaft of the transmission of the automobile in a sleeved manner, the ratchet 3 is rotatable together with the output shaft of the transmission, a plurality of stopper grooves 7 are provided on the outer peripheral side of the ratchet 3, the stopper grooves 7 are provided at equal intervals along the circumferential direction of the ratchet 3, and each stopper groove 7 in the present embodiment is a trapezoidal groove. In this embodiment, the pawl 2 is in a long handle shape, one end of the pawl 2 is rotatably assembled on the pawl rotating shaft 4, the other end of the pawl 2 is provided with a protrusion 6 for being inserted into the limiting groove 7, the protrusion 6 is arranged on the side of the pawl 2 facing the ratchet wheel 3, and the shape of the protrusion 6 is matched with the shape of the notch of the limiting groove 7. In the embodiment, the pawl rotating shaft 4 is fixedly connected with the shell of the automobile transmission. In order to enable the protrusion 6 on the pawl 2 to automatically disengage from the limiting groove 7 in the non-parking state, the pawl 2 is further provided with a reset structure 5 in the embodiment, the reset structure 5 is a torsion spring in the embodiment, the torsion spring is sleeved on the outer peripheral side of the pawl rotating shaft 4, one end of the torsion spring is fixed with the pawl 2, and the other end of the torsion spring is fixed with the transmission housing. Like this when pawl 2 receives the exogenic action to 3 one side swings of ratchet, reset structure 5 can the energy storage by oneself, and when pawl 2 no longer received exogenic action, reset structure 5 can release the energy storage to realize protruding 6 and spacing groove 7's separation.

In order to park, namely to enable the protrusion 6 on the pawl 2 to be inserted into the limit groove 7 on the ratchet wheel 3, the cam mechanism 1 for driving the pawl 2 to swing towards the ratchet wheel 3 side is further provided in the embodiment. As shown in fig. 2, the cam mechanism 1 of the present embodiment includes a rotating shaft structure, a first elastic member 12, a cam member 9, and an urging structure 14. The rotating shaft structure in this embodiment includes a rotating shaft portion 8 and a limiting member 10. The rotating shaft part 8 is a rotating shaft, one end of the rotating shaft part 8 is directly in transmission connection with a driving shaft (or other driving systems) of the parking motor, and the rotating shaft part 8 is driven to rotate through the rotating shaft of the parking motor. In this embodiment, the limiting member 10 is plate-shaped, the limiting member 10 is fixedly connected to the rotating shaft portion 8, specifically, a fixing hole for inserting the rotating shaft portion 8 is provided inside the limiting member 10, and the fixing manner of the limiting member 10 and the rotating shaft portion 8 may be a manner of interference fit between the fixing hole and the rotating shaft portion 8, or may be a manner of directly adopting welding and fixing. The cam member 9 is also plate-shaped in this embodiment, and the cam member 9 is rotatably fitted on the rotating shaft portion 8. In this embodiment, the first elastic member 12 is also a torsion spring, the first elastic member 12 is sleeved on the outer periphery of the rotating shaft portion 8, one end of the first elastic member 12 is fixed to the cam member 9, and the other end of the first elastic member 12 is fixed to the limiting member 10, specifically, in this embodiment, one end of the first elastic member 12 is directly fixed to the side of the cam member 9, and the other end is fixed to the lateral edge of the limiting member 10 in a blocking manner. When the cam member 9 rotates around the rotating shaft portion 8, the first elastic member 12 stores energy by itself, so that when the cam member 9 loses the external force, the first elastic member 12 drives the cam member 9 to return to the initial position.

It should be noted that, since the cam member 9 in this embodiment pushes the pawls 2 during the rotation, in order to meet this requirement, the outer contour of the cam member 9 in this application has a changing process in which the radius (the distance from the rotating shaft portion 8) is gradually increased, and since this structure is designed as a conventional design of the cam driving structure, the outer contour structure of the cam member 9 in this embodiment will not be described in detail. In order to avoid the situation that the cam member 9 is translated along the rotating shaft portion 8, a limiting sleeve 11 is further sleeved and fixed on the rotating shaft portion 8 in the embodiment, and the fixing mode of the limiting sleeve 11 can be threaded assembling or welding fixing. The cam element 9 is in this embodiment clamped between the stop collar 11 and the stop element 10.

In the present embodiment, the locking surface 19 and the limiting arm 13 are disposed on the limiting member 10, specifically, in the present embodiment, the limiting arm 13 is a bar integrally disposed on the limiting member 10, the extending direction of the bar is parallel to the rotating shaft portion 8, and the bar and the side surface of the cam member 9 are blocked with each other, so that when the cam member 9 automatically resets under the action of the first elastic member 12, the bar can block the cam member 9, thereby playing a role of limiting the resetting stroke of the cam member 9.

In the present embodiment, a protruding portion 15 is further disposed on the outer peripheral side of the limiting member 10, the protruding portion 15 is slightly higher than the outer peripheral surface of the limiting member 10, both sides of the protruding portion 15 have transition slopes connected and transitioned with the outer peripheral surface of the limiting member 10, and the transition slopes on both sides of the protruding portion 15 constitute the locking surface 19 in the present embodiment. In this embodiment, the locking surface 19 is used for pushing and stopping with the pushing structure 14, thereby functioning to limit the rotation of the rotating shaft portion 8. As shown in fig. 4, the cross section of the protruding portion 15 in the present embodiment is an isosceles trapezoid, the inclined angle of the locking surface 19 on both sides of the protruding portion 15 is specifically 60 ° (the inclined angle is specifically the included angle formed by the waist and the bottom side of the isosceles trapezoid), in other embodiments, the inclined angle of the locking surface 19 may be any value between 30 ° and 60 °, for example, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, etc., it should be noted that the inclined angle range of the locking surface 19 is only a preferred angle range, and the specific inclined angle of the locking surface 19 in the present embodiment is not limited to the above angle range.

The rotating shaft structure in this embodiment includes a rotating shaft portion 8 and a limiting member 10, and in other embodiments, the rotating shaft structure may not include an individual limiting member 10, at this time, one end of the first elastic member 12, which is used for being fixedly connected with the limiting member 10, may be directly and fixedly connected with the rotating shaft portion 8, and the limiting arm 13 is directly and integrally arranged on the rotating shaft portion 8; in other embodiments, the limiting arm 13 may also be disposed on the cam element 9 or at other set positions, and the limiting of the reset stroke of the cam element 9 is achieved through the stopping function of the limiting arm 13 and the limiting element 10. The protrusion 15 may be provided directly on the rotating shaft portion 8 in other embodiments.

As shown in fig. 3, in the present embodiment, the pushing structure 14 is an elastic telescopic structure, the pushing structure 14 is also fixed to the casing of the automotive transmission, and the pushing structure 14 includes a sleeve seat 16, a second elastic member 17 and a top block 18. The second elastic element 17 is a spring, a receiving groove is arranged in the sleeve seat 16, and the top block 18 is embedded in the notch position of the receiving groove, i.e. the top block 18 only partially leaks out of the receiving groove and cannot be separated from the receiving groove. In this embodiment, the spring is placed in the accommodating groove, one end of the second elastic member 17 is in pressing contact with the bottom of the accommodating groove, and the other end of the second elastic member is in pressing contact with the top block 18. The top block 18 in this embodiment can slide along the groove depth direction of the receiving groove and compress the second elastic member 17. Since the top block 18 is to slide along the protrusion 15, in order to avoid the situation that the top block 18 is likely to slide unsmoothly due to the large number of corners of the top block 18, in the present embodiment, a rolling curved surface is provided on the outer circumferential surface of the top block 18, and the rolling curved surface can roll along the protrusion 15, so that the top block can cross the protrusion 15 in a rolling manner. Specifically, in the present embodiment, the top block 18 is designed to be a sphere, and the outer surface of the sphere top block forms a rolling curved surface, in other embodiments, the top block 18 may also be a cylinder, and at this time, the cylindrical curved surface of the top block 18 forms a rolling curved surface. In other embodiments, the pushing structure 14 may be a telescoping rod structure.

The utility model discloses a working process does: when the automobile does not need to be parked, as shown in fig. 1, the cam mechanism 1 does not push the pawl 2, the pawl 2 is separated from the ratchet wheel 3 under the action of the reset structure 5, and the ratchet wheel 3 can synchronously rotate along with the output shaft of the automobile transmission.

When a vehicle needs to be parked, the rotating shaft part 8 is driven to rotate by the parking motor, the limiting piece 10 can synchronously rotate along with the rotating shaft part 8, and due to the fact that the first elastic piece 12 is arranged between the limiting piece 10 and the cam piece 9, the cam piece 9 can also rotate along with the rotating shaft part 8 under the effect of the first elastic piece 12. The rotating cam piece 9 can gradually push the pawl 2 to the ratchet wheel 3 under the action of the reducing outer contour, and along with the approach of the pawl 2 and the ratchet wheel 3, two contact modes exist between the protrusion 6 on the pawl 2 and the ratchet wheel 3:

one of the contact modes is that the protrusion 6 on the pawl 2 is over against a certain limit groove 7 on the ratchet wheel 3, at the moment, the protrusion 6 on the pawl 2 can be inserted into the limit groove 7, and the ratchet wheel 3 can be limited to rotate due to the blocking effect of the protrusion 6 and the limit groove 7, so that the braking limitation of the automobile transmission is realized. It should be noted that, during this process, the rotating shaft 8 rotates by a set angle, and at this time, the protrusion 15 on the limiting member 10 also rotates from one side of the pushing structure 14 to the other side, and the top block 18 of the pushing structure 14 moves into the receiving groove and compresses the second elastic member 17 when sliding over the protrusion 15. After the rotating shaft part 8 rotates for a set angle, the top block 18 of the pushing structure 14 is pushed against the corresponding locking surface 19, at this time, the pawl 2 generates an anticlockwise acting force on the cam part 9, the pushing structure 14 generates a clockwise acting force on the limiting part 10, the two acting forces are mutually offset, so that the protrusion 6 is kept at the position inserted into the limiting groove 7, the rotation limitation of the ratchet wheel 3 is realized, and the parking of the automobile is completed.

In another contact mode, the protrusion 6 on the pawl 2 is not directly opposite to the limiting groove 7 on the ratchet 3, at this time, the protrusion 6 will press against the outer peripheral side of the ratchet 3 (i.e. the top of the convex teeth of the ratchet 3), because the cam member 9 cannot push the pawl 2 continuously, the cam member 9 will press against the pawl 2 and stop rotating, and the rotating shaft 8 and the limiting member 10 will continue to rotate under the action of the parking motor, during this process, the first elastic member 12 will store energy by itself, when the rotating shaft 8 continues to rotate to a set angle (which is the same as the rotation angle of the previous contact mode), the pushing structure 14 will also press against the corresponding locking surface 19, because the movement mode and the action principle of the protruding portion 15 and the pushing structure 14 are the same as those of the previous contact mode, and detailed description is omitted in this contact mode. Inequality, in this mode of contact, pawl 2 can produce anticlockwise effort to cam piece 9, and top pushes away structure 14 and can produce clockwise effort to locating part 10, because the transmission effect of power can be realized to first elastic component 12 between cam piece 9 and the locating part 10, cam mechanism 1 can be in the stress balance state, and arch 6 on pawl 2 then can the top pressure in the periphery side of ratchet 3, when ratchet 3 slightly rotated, arch 6 on pawl 2 will insert the spacing groove 7 of ratchet to the realization is to ratchet 3's rotation stopping braking, accomplishes the parking promptly.

When parking needs to be relieved, the rotating shaft part 8 is driven to rotate reversely by the parking motor, at the moment, the limiting piece 10 overcomes the acting force of the pushing structure 14, the cam piece 9 rotates reversely under the action of the limiting arm 13, so that the jacking pressure on the pawl 2 is relieved, the pawl 2 is separated from the ratchet wheel 3 under the action of the resetting structure 5, the rotation stopping brake on the ratchet wheel 3 is relieved, and the parking relieving is finished.

The embodiment of the utility model discloses a cam mechanism 1: the structure of the cam mechanism 1 is the same as the specific structure of the cam mechanism 1 in the parking device described above, and details thereof are not described in the present embodiment.

To sum up, the embodiment of the utility model provides a cam mechanism 1, a parking device, its protruding 6 on pawl 2 and under the condition that spacing groove 7 on the ratchet 3 can not the accurate alignment, still can realize the locking of splining to ratchet 3 to avoid the problem of parking locking illusion, ensured the validity of parking locking, improved the security of driving, eliminated potential traffic safety hidden danger. Additionally, the utility model discloses a parking device does not have the requirement to the parking motor, can be in order to adopt the parking motor that does not have self-locking function, has removed the restriction to the parking motor lectotype.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A cam mechanism characterized by: the cam mechanism comprises a rotating shaft structure, a first elastic piece (12), a cam piece (9) and a pushing structure (14), wherein the cam piece (9) is rotatably assembled with the rotating shaft structure, and the first elastic piece (12) is used for applying a resetting acting force to the cam piece (9) when the cam piece (9) rotates around the rotating shaft structure; the rotating shaft structure is further provided with a locking surface (19), and the locking surface (19) is used for stopping and limiting with the pushing structure (14) so as to lock the rotating shaft structure after the rotating shaft structure rotates for a set angle.

2. The cam mechanism of claim 1, wherein: the rotating shaft structure is further provided with a limiting arm (13), and the limiting arm (13) is used for being blocked and limited with the cam piece (9) so as to limit the reset stroke of the cam piece (9).

3. A cam mechanism according to claim 2, wherein: the rotating shaft structure comprises a rotating shaft part (8) and a limiting piece (10), wherein the limiting piece (10) is fixedly assembled on the rotating shaft part (8), and a limiting arm (13) is arranged on the limiting piece (10).

4. A cam mechanism according to claim 3, wherein: the locking surface (19) is arranged on the limiting part (10) and/or the rotating shaft part (8).

5. The cam mechanism of claim 1, wherein: the locking surface (19) is an inclined surface, and the inclination angle of the locking surface (19) is 30-60 degrees.

6. The cam mechanism of claim 1, wherein: the rotating shaft structure is provided with a protruding part (15), and the locking surfaces (19) are arranged on two opposite sides of the protruding part (15).

7. The cam mechanism of claim 1, wherein: the pushing structure (14) is an elastic telescopic structure.

8. The cam mechanism of claim 7, wherein: the elastic telescopic structure comprises a sleeve seat (16), a second elastic piece (17) and a top block (18), wherein a containing groove is formed in the sleeve seat (16), the top block (18) is embedded in a groove opening of the containing groove, the second elastic piece (17) is installed in the containing groove, and the second elastic piece (17) is used for ejecting the containing groove of the top block (18) part so that the top block (18) is in top pressure contact with a locking surface (19).

9. The cam mechanism of claim 8, wherein: the outer peripheral surface of the ejector block (18) is provided with a rolling curved surface.

10. A parking device characterized in that: the parking brake device comprises a ratchet wheel (3), a pawl (2) and a reset structure (5), wherein a plurality of limiting grooves (7) are arranged on the outer peripheral side of the ratchet wheel (3) at intervals, protrusions (6) used for being inserted into the limiting grooves (7) are arranged on the pawl (2), the reset structure (5) is used for applying reset acting force to the pawl (2) so that the protrusions (6) can be separated from the limiting grooves (7) in a non-parking state, the parking brake device further comprises a cam mechanism (1), the cam mechanism (1) is used for driving the pawl (2) to swing so that the pawl (2) and the ratchet wheel (3) are in blocking contact, and the cam mechanism (1) adopts the cam mechanism (1) according to any one of claims 1 to 9.