阅读说明：本技术 一种回转轴式驻车机构 (Revolving shaft type parking mechanism ) 是由 吴松国 闵涛 孙山 于 2021-01-18 设计创作，主要内容包括：本发明涉及汽车驻车技术领域,旨在解决现有驻车结构存在布置空间不足的问题,提供回转轴式驻车机构,其包括驱动回转轴组件、棘爪组件和驻车棘轮；驱动回转轴组件包括驱动回转轴、驻车限位板和驻车凸轮；驻车限位板安装于驱动回转轴上；驻车凸轮可转动地安装于驱动回转轴上,并和驻车限位板的板面对应；驻车限位板上开设有限位槽,驻车凸轮设有伸入限位槽的凸台驻车棘轮的外周面周向分布有若干齿槽；棘爪组件包括驻车棘爪和引导销；引导销固连于驻车棘爪,并朝驻车限位板方向伸出至伸入限位槽内的位置。本发明的有益效果是能够方便地实现驻车和解除驻车,且驻车结构布置更加紧凑可靠。(The invention relates to the technical field of automobile parking, and aims to solve the problem of insufficient layout space of the existing parking structure; the driving rotating shaft assembly comprises a driving rotating shaft, a parking limiting plate and a parking cam; the parking limit plate is arranged on the driving rotating shaft; the parking cam is rotatably arranged on the driving rotating shaft and corresponds to the plate surface of the parking limit plate; a limiting groove is formed in the parking limiting plate, and a plurality of tooth grooves are circumferentially distributed on the outer peripheral surface of the parking cam provided with a boss parking ratchet wheel extending into the limiting groove; the pawl assembly includes a parking pawl and a guide pin; the guide pin is fixedly connected with the parking pawl and extends out to the position extending into the limit groove towards the direction of the parking limit plate. The parking device has the advantages that parking and parking release can be conveniently realized, and the parking structure is more compact and reliable in arrangement.)

1. A revolving shaft type parking mechanism is characterized in that:

the parking ratchet wheel driving device comprises a driving rotating shaft assembly, a pawl assembly and a parking ratchet wheel;

the driving rotating shaft assembly comprises a driving rotating shaft, a parking limiting plate and a parking cam; the parking limiting plate is arranged on the driving rotating shaft and can rotate under the driving of the driving rotating shaft; the parking cam is rotatably arranged on the driving rotating shaft and corresponds to the plate surface of the parking limit plate;

the parking cam is provided with a boss which extends out towards the parking limit plate and into the limit groove; the periphery of the parking cam has a working surface consisting of a first face segment, a second face segment and a third face segment, the radial dimension of the first face segment is larger than that of the second face segment, and the first face segment is positioned at the downstream of the second face segment in the parking rotation direction of the driving rotating shaft assembly; the third face section is connected between the first face section and the second face section in a transition mode;

a plurality of tooth grooves are circumferentially distributed on the outer peripheral surface of the parking ratchet wheel;

the pawl assembly includes a parking pawl and a guide pin; the parking pawl has pawl teeth matching the tooth grooves and is configured to be urged to move its pawl teeth between a first position and a second position, wherein in the first position the pawl teeth are captured within the tooth grooves to limit rotation of the parking ratchet; in the second position, the pawl teeth are located outside the tooth grooves and do not restrict rotation of the parking ratchet; the guide pin is fixedly connected with the parking pawl and extends out towards the parking limit plate to a position extending into the limit groove;

the groove surface of the limiting groove comprises a first limiting surface, a second limiting surface, a third limiting surface and a fourth limiting surface; the first limiting surface and the second limiting surface are arranged oppositely in an arc direction, the third limiting surface and the fourth limiting surface are arc surfaces facing the rotation center of the parking limiting plate, and the third limiting surface is connected to the downstream of the fourth limiting surface in the parking rotation direction of the driving rotating shaft assembly in a transition mode; in the direction from the fourth limiting surface to the third limiting surface, the radial sizes of the fourth limiting surface and the third limiting surface are in a decreasing trend;

the first limiting surface and the second limiting surface limit the arc-direction two-end limiting position of the boss rotating in the limiting groove; the first limiting surface is positioned at the downstream of the second limiting surface in the parking rotating direction of the driving rotating shaft assembly; an elastic piece is connected between the parking limiting plate and the parking cam, and can apply a torsional elastic force to the parking cam on the basis of the parking limiting plate, and the torsional elastic force enables a boss of the parking cam to elastically press against the first limiting surface; the parking limiting plate can overcome the torsional elastic force and rotate relative to the parking cam, so that the boss moves towards the direction of the second limiting surface relatively;

the working surface of the parking cam abuts against one side, away from the pawl teeth, of the parking pawl to limit the limit position of the parking pawl in the direction away from the parking ratchet wheel; the third stopper surface and the fourth stopper surface are capable of supporting the guide pin to define an extreme position of the parking pawl near the parking ratchet direction by the guide pin;

in a parking state, the second surface section of the parking cam abuts against the parking pawl, and the fourth limiting surface supports the parking pawl through a guide pin; in the non-parking state, the first surface section of the parking cam corresponds to the parking pawl so as to limit the limit position of the parking pawl far away from the direction of the parking ratchet wheel, and the third limit surface supports the parking pawl through the guide pin.

2. The rotary shaft parking mechanism according to claim 1 wherein:

one end of the parking pawl, which is far away from the pawl teeth of the parking pawl, is provided with a rotating shaft, and the parking pawl is arranged to rotate around the rotating shaft so that the pawl teeth of the parking pawl rotate to be close to or far away from the parking ratchet wheel.

3. The rotary shaft parking mechanism according to claim 2 wherein:

and one side of the parking pawl, which corresponds to the working surface of the parking cam, is rotatably provided with a roller, and the parking pawl is matched with the working surface in an abutting mode through the roller.

4. The rotary shaft parking mechanism according to claim 3 wherein:

the roller is rotatably arranged at one end of the guide pin connected with the parking pawl and is located at the middle position of the parking pawl in the width direction.

5. The rotary shaft parking mechanism according to claim 1 wherein:

the elastic piece is a torsion spring, the torsion spring is sleeved on the driving rotating shaft, one end of the torsion spring is connected with the driving rotating shaft, the other end of the torsion spring penetrates through the limiting groove and then is connected with the boss of the parking cam, and therefore the driving rotating shaft is indirectly arranged on the parking limiting plate and forms torsional elastic force between the parking cams.

6. The rotary shaft parking mechanism according to claim 5 wherein:

and an installation pin vertically penetrates through the driving rotating shaft, and one end of the torsion spring is connected to the driving rotating shaft through the installation pin.

7. The rotary shaft parking mechanism according to claim 1 wherein:

the rotary shaft type parking mechanism further comprises a locking spring steel ball;

the radial outer side of the parking limit plate is provided with a sector area with a sector-shaped plate surface; a positioning wave-shaped groove is formed in the plate surface at one axial end of the fan-shaped area; the positioning wave-shaped groove comprises a parking blocking groove and a non-parking blocking groove; the parking blocking groove and the non-parking blocking groove are in transition connection with each other;

the locking spring steel balls and the driving rotating shaft are arranged in parallel, vertically correspond to the positioning corrugated groove, and can be elastically pressed into the positioning corrugated groove; when the locking spring steel ball falls into the parking stop groove or the non-parking stop groove, a certain resistance can be applied to limit the rotation of the parking limit plate;

when the parking limiting plate rotates to enable the parking stopping groove of the parking limiting plate to correspond to the locking spring steel ball, the parking limiting plate is in the parking state; and when the parking limiting plate rotates to enable the non-parking stopping groove of the parking limiting plate to correspond to the locking spring steel ball, the parking limiting plate is in the non-parking state.

8. The rotary shaft parking mechanism according to claim 1 wherein:

and a transmission pin vertically penetrates through the driving rotating shaft, a transmission groove is formed in the parking limiting plate, and the transmission pin is matched in the transmission groove and used as a transmission matching structure of the driving rotating shaft and the parking limiting plate.

9. The rotary shaft parking mechanism according to claim 1 wherein:

and a clamping ring is clamped on the driving rotating shaft and used for limiting the axial transmission of the parking cam and/or the parking limiting plate.

Technical Field

The invention relates to the technical field of automobile parking, in particular to a rotary shaft type parking mechanism.

Background

Existing parking mechanisms include push-rod or cam type parking. In contrast, cam parking is more compact in spatial layout.

However, the cam parking still has the problem of insufficient layout space at present.

Disclosure of Invention

The invention aims to provide a rotary shaft type parking mechanism to solve the problem that the existing parking structure is insufficient in layout space.

The embodiment of the invention is realized by the following steps:

a rotary shaft type parking mechanism comprises a driving rotary shaft assembly, a pawl assembly and a parking ratchet wheel;

the driving rotating shaft assembly comprises a driving rotating shaft, a parking limiting plate and a parking cam; the parking limiting plate is arranged on the driving rotating shaft and can rotate under the driving of the driving rotating shaft; the parking cam is rotatably arranged on the driving rotating shaft and corresponds to the plate surface of the parking limit plate;

the parking cam is provided with a boss which extends out towards the parking limit plate and into the limit groove; the periphery of the parking cam has a working surface consisting of a first face segment, a second face segment and a third face segment, the radial dimension of the first face segment is larger than that of the second face segment, and the first face segment is positioned at the downstream of the second face segment in the parking rotation direction of the driving rotating shaft assembly; the third face section is connected between the first face section and the second face section in a transition mode;

a plurality of tooth grooves are circumferentially distributed on the outer peripheral surface of the parking ratchet wheel;

the pawl assembly includes a parking pawl and a guide pin; the parking pawl has pawl teeth matching the tooth grooves and is configured to be urged to move its pawl teeth between a first position and a second position, wherein in the first position the pawl teeth are captured within the tooth grooves to limit rotation of the parking ratchet; in the second position, the pawl teeth are located outside the tooth grooves and do not restrict rotation of the parking ratchet; the guide pin is fixedly connected with the parking pawl and extends out towards the parking limit plate to a position extending into the limit groove;

the groove surface of the limiting groove comprises a first limiting surface, a second limiting surface, a third limiting surface and a fourth limiting surface; the first limiting surface and the second limiting surface are arranged oppositely in an arc direction, the third limiting surface and the fourth limiting surface are arc surfaces facing the rotation center of the parking limiting plate, and the third limiting surface is connected to the downstream of the fourth limiting surface in the parking rotation direction of the driving rotating shaft assembly in a transition mode; in the direction from the fourth limiting surface to the third limiting surface, the radial sizes of the fourth limiting surface and the third limiting surface are in a decreasing trend;

the first limiting surface and the second limiting surface limit the arc-direction two-end limiting position of the boss rotating in the limiting groove; the first limiting surface is positioned at the downstream of the second limiting surface in the parking rotating direction of the driving rotating shaft assembly; an elastic piece is connected between the parking limiting plate and the parking cam, and can apply a torsional elastic force to the parking cam on the basis of the parking limiting plate, and the torsional elastic force enables a boss of the parking cam to elastically press against the first limiting surface; the parking limiting plate can overcome the torsional elastic force and rotate relative to the parking cam, so that the boss moves towards the direction of the second limiting surface relatively;

the working surface of the parking cam abuts against one side, away from the pawl teeth, of the parking pawl to limit the limit position of the parking pawl in the direction away from the parking ratchet wheel; the third stopper surface and the fourth stopper surface are capable of supporting the guide pin to define an extreme position of the parking pawl near the parking ratchet direction by the guide pin;

in a parking state, the second surface section of the parking cam abuts against the parking pawl, and the fourth limiting surface supports the parking pawl through a guide pin; in the non-parking state, the first surface section of the parking cam corresponds to the parking pawl so as to limit the limit position of the parking pawl far away from the direction of the parking ratchet wheel, and the third limit surface supports the parking pawl through the guide pin.

When the rotary shaft type parking mechanism in the scheme needs to park, an external parking motor or a mechanical rocker arm and the like drive the rotary shaft to rotate along the parking direction; the parking limit plate rotates along with the same direction; there are two cases at this time:

the first condition is as follows: when the pawl teeth correspond to the tooth grooves of the parking ratchet wheel, the parking limiting plate drives the parking cam to rotate through the elastic piece, and the third surface section of the parking cam extrudes the parking pawl, so that the pawl teeth of the parking pawl move to the first position and enter the tooth grooves of the parking ratchet wheel; after the rotating shaft is driven to rotate to a P gear (namely a parking gear), the parking cam is limited to a corresponding angle by a first limiting surface of the parking limiting plate, a guide pin on the parking pawl is limited to a fixed height by a fourth limiting surface of the parking limiting plate and cannot fall continuously, and meanwhile, the parking pawl is limited below a second surface section of the parking cam and cannot move upwards, so that pawl teeth of the parking pawl are kept at a proper position clamped into a tooth socket, a parking state is achieved, and parking is finished; at the moment, the steel ball on the locking spring steel ball falls into the parking stop groove on the parking limit plate, so that the parking limit plate and the driving rotating shaft can be kept at the P-gear position;

case two: when the pawl teeth correspond to the non-tooth-socket tooth surfaces of the parking ratchet wheel, the parking pawl cannot continuously rotate to a parking position, the rotating shaft is driven to rotate to a P-gear angle, the parking limiting plate synchronously rotates to the P-gear angle, the parking cam is limited by the parking pawl and cannot continuously rotate, at the moment, the parking cam and the driving rotating shaft relatively rotate, the parking cam and the driving rotating shaft are converted into a torsional deformation angle of the elastic piece, the torque is increased, and energy is stored; at the moment, a steel ball on a locking spring steel ball falls into a parking blocking groove on a parking limiting plate, so that the parking limiting plate and a driving rotating shaft can be kept at a P-gear position without returning, when a vehicle moves, a parking ratchet wheel gradually rotates to a position where tooth grooves of the parking ratchet wheel correspond to pawl teeth, so that under the action of the torque force of an elastic piece, a parking cam can continuously rotate to a P-gear angle, a parking pawl is pressed down to enter the tooth grooves of the parking ratchet wheel, and the parking state is achieved;

in the parking state, the fourth limiting surface limits the lower limit position of the parking pawl through the guide pin, and the second surface section of the parking cam limits the upper limit position of the parking pawl, so that the parking pawl is completely limited in position.

When the parking is required to be released to enter a non-parking state, the driving rotating shaft is driven to rotate in a direction opposite to the parking direction, and the parking limiting plate rotates along with the driving rotating shaft; the parking ratchet wheel is driven to rotate synchronously with the parking limiting plate through the contact of a first limiting surface on the parking limiting plate and a boss of the parking cam, a fourth limiting surface of a limiting groove on the parking limiting plate rotates towards a direction far away from the parking ratchet wheel relative to the rotating axis, and the parking pawl moves towards a second position under the driving of a guide pin of the parking pawl on the third limiting surface of the parking limiting plate, so that pawl teeth of the parking pawl are separated from a tooth socket, the action of parking release is completed, and the parking pawl enters a non-parking state; at this time, the third limiting surface limits the lower limit position of the parking pawl through the guide pin, and the first surface section of the parking cam limits the upper limit position of the parking pawl, so that the parking pawl is completely limited in position. At the moment, the steel ball on the locking spring steel ball falls into the non-parking blocking groove on the parking limiting plate, so that the parking limiting plate and the driving rotating shaft can be kept at the non-P-blocking position;

in this scheme, through the cooperation relation that rationally sets up each grooved surface of spacing groove, parking cam upper ledge and parking pawl and spacing groove and the cooperation relation of parking cam working face and parking pawl, make the spacing groove have concurrently to parking cam transmission, to the guide and the transmission of parking pawl for this revolving axle formula parking mechanism can conveniently realize the parking and relieve the operation of parking, and can both reliably restrict in the position of parking state and non-parking state parking pawl. Furthermore, as described above, the parking action can be accommodated when the pawl teeth correspond to the gullets or non-gullet flanks of the parking ratchet. Through the structure, the parking structure can be more compact and reliable.

In one embodiment:

one end of the parking pawl, which is far away from the pawl teeth of the parking pawl, is provided with a rotating shaft, and the parking pawl is arranged to rotate around the rotating shaft so that the pawl teeth of the parking pawl rotate to be close to or far away from the parking ratchet wheel.

In one embodiment:

and one side of the parking pawl, which corresponds to the working surface of the parking cam, is rotatably provided with a roller, and the parking pawl is matched with the working surface in an abutting mode through the roller.

In one embodiment:

the roller is rotatably arranged at one end of the guide pin connected with the parking pawl and is located at the middle position of the parking pawl in the width direction.

In one embodiment:

the elastic piece is a torsion spring, the torsion spring is sleeved on the driving rotating shaft, one end of the torsion spring is connected with the driving rotating shaft, the other end of the torsion spring penetrates through the limiting groove and then is connected with the boss of the parking cam, and therefore the driving rotating shaft is indirectly arranged on the parking limiting plate and forms torsional elastic force between the parking cams.

In one embodiment:

the rotary shaft type parking mechanism further comprises a locking spring steel ball;

the radial outer side of the parking limit plate is provided with a sector area with a sector-shaped plate surface; a positioning wave-shaped groove is formed in the plate surface at one axial end of the fan-shaped area; the positioning wave-shaped groove comprises a parking blocking groove and a non-parking blocking groove; the parking blocking groove and the non-parking blocking groove are in transition connection with each other;

the locking spring steel balls and the driving rotating shaft are arranged in parallel, vertically correspond to the positioning corrugated groove, and can be elastically pressed into the positioning corrugated groove; when the locking spring steel ball falls into the parking stop groove or the non-parking stop groove, a certain resistance can be applied to limit the rotation of the parking limit plate;

when the parking limiting plate rotates to enable the parking stopping groove of the parking limiting plate to correspond to the locking spring steel ball, the parking limiting plate is in the parking state; and when the parking limiting plate rotates to enable the non-parking stopping groove of the parking limiting plate to correspond to the locking spring steel ball, the parking limiting plate is in the non-parking state.

Compared with the existing design of circumferential vertical arrangement, the arrangement mode of the locking spring steel balls in the embodiment greatly reduces the arrangement space of the whole mechanism.

In one embodiment:

and an installation pin vertically penetrates through the driving rotating shaft, and one end of the torsion spring is connected to the driving rotating shaft through the installation pin.

In one embodiment:

and a transmission pin vertically penetrates through the driving rotating shaft, a transmission groove is formed in the parking limiting plate, and the transmission pin is matched in the transmission groove and used as a transmission matching structure of the driving rotating shaft and the parking limiting plate.

In one embodiment:

and a clamping ring is clamped on the driving rotating shaft and used for limiting the axial transmission of the parking cam and/or the parking limiting plate.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.

FIG. 1 shows a three-dimensional schematic view of a pivoting parking mechanism in an embodiment of the present invention;

FIG. 2 illustrates a first perspective plan view of a pivoting parking mechanism in an embodiment of the present invention;

FIG. 3 illustrates a second perspective plan view of the pivoting parking mechanism in an embodiment of the present invention;

FIG. 4 shows a three-dimensional schematic view of a drive-swivel assembly in an embodiment of the present invention;

FIG. 5 illustrates a third perspective view of the drive swivel assembly in an embodiment of the present invention;

a fourth perspective view of the parking limit plate in the embodiment of the invention is shown in fig. 6;

fig. 7 is a fifth perspective view of the parking restriction plate in the embodiment of the present invention;

a sixth perspective view of the parking cam in the embodiment of the present invention is shown in fig. 8;

a seventh perspective view of the park pawl assembly in an embodiment of the present invention is shown in fig. 9.

Icon: 10-a swivel type parking mechanism; 11-driving the rotating shaft assembly; 12-a pawl assembly; 13-parking ratchet wheel; 14-driving the rotating shaft; 15-parking limit plate; 16-a parking cam; 17-a drive pin; 18-a drive groove; 19-a snap ring; 20-a limiting groove; 21-a boss; 22-a first face section; 23-a second face section; 24-a third face segment; 25-a working surface; 26-parking rotational direction; 27-gullet; 28-parking pawl; 29-a guide pin; 30-pawl teeth; 31-a first position; 32-a second position; 33-a rotating shaft; 34-a first limit surface; 35-a second limiting surface; 36-a third limiting surface; 37-a fourth limit surface; 38-an elastic member; 39-torsion spring; 40-mounting pins; 43-a roller; 44-locking spring steel balls; 45-sector area; 46-positioning wave-shaped grooves; 47-parking catch groove; 48-non-park notch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-3, the present embodiment provides a rotary shaft parking mechanism 10 including a driving rotary shaft assembly 11, a pawl assembly 12 and a parking ratchet 13.

Referring to fig. 4 and 5, in the present embodiment, the driving rotation shaft assembly 11 includes a driving rotation shaft 14, a parking limit plate 15, and a parking cam 16.

The parking position limiting plate 15 is mounted on the driving rotation shaft 14 and can be rotated by the driving rotation shaft 14. Optionally, a transmission pin 17 is vertically penetrated through the driving rotating shaft 14, a transmission groove 18 is formed in the parking limit plate 15, and the transmission pin 17 is matched in the transmission groove 18 to serve as a transmission matching structure of the driving rotating shaft 14 and the parking limit plate 15.

The parking cam 16 is rotatably mounted on the drive rotating shaft 14 and corresponds to the plate surface of the parking stopper plate 15. A certain distance is provided between the parking cam 16 and the parking stopper plate 15.

In this embodiment, a snap ring 19 is also clamped to the drive shaft 14 to limit the axial movement of the parking cam 16 and/or the parking limit plate 15.

Referring to fig. 6 to 8, in the present embodiment, the parking limit plate 15 is provided with a limit groove 20, and the parking cam 16 is provided with a boss 21 extending toward the parking limit plate 15 and into the limit groove 20; the periphery of the parking cam 16 has a working face 25 formed by a first face segment 22, a second face segment 23 and a third face segment 24, the radial dimension of the first face segment 22 being greater than the radial dimension of the second face segment 23 in a parking rotation direction 26 of the drive shaft assembly 11, the first face segment 22 being located downstream of the second face segment 23; the third face section 24 is connected in transition between the first face section 22 and the second face section 23.

In this embodiment, a plurality of tooth grooves 27 are circumferentially distributed on the outer circumferential surface of the parking ratchet 13. That is, the outer peripheral surface of the parking ratchet 13 has a spline 27 portion and a cylindrical surface portion between the splines 27.

Referring cooperatively to fig. 9, in the present embodiment, the pawl assembly 12 includes a parking pawl 28 and a guide pin 29; the parking pawl 28 has pawl teeth 30 matching the splines 27, and the parking pawl 28 is configured to be urged to move its pawl teeth 30 between a first position 31 and a second position 32, wherein in the first position 31 the pawl teeth 30 are caught in the splines 27 to limit rotation of the parking ratchet 13; in the second position 32, the pawl teeth 30 are located outside the tooth grooves 27 and do not restrict rotation of the parking ratchet 13; the guide pin 29 is attached to the parking pawl 28 and extends toward the parking limit plate 15 to a position where it extends into the limit groove 20.

In the present embodiment, optionally, one end of the parking pawl 28 remote from the pawl teeth 30 thereof is provided with a rotating shaft 33, and the parking pawl 28 is provided so as to be able to rotate about the rotating shaft 33 to rotate the pawl teeth 30 thereof closer to or away from the parking ratchet wheel 13.

Referring again to fig. 6-7, the groove surfaces of the limiting groove 20 include a first limiting surface 34, a second limiting surface 35, a third limiting surface 36 and a fourth limiting surface 37; the first limiting surface 34 and the second limiting surface 35 are arranged oppositely in an arc direction, the third limiting surface 36 and the fourth limiting surface 37 are arc surfaces facing the rotation center of the parking limiting plate 15, and the third limiting surface 36 is transitionally connected to the downstream of the fourth limiting surface 37 in the parking rotation direction 26 of the driving rotating shaft assembly 11; in the direction from the fourth stopper surface 37 to the third stopper surface 36, the radial dimensions of the fourth stopper surface 37 and the third stopper surface 36 tend to decrease.

Wherein, the first limit surface 34 and the second limit surface 35 limit the arc-direction limit positions of the boss 21 rotating in the limit groove 20; the first stopper surface 34 is located downstream of the second stopper surface 35 in the parking rotation direction 26 of the driving rotation shaft assembly 11; an elastic piece 38 is connected between the parking limit plate 15 and the parking cam 16, and the elastic piece 38 can apply a torsional elastic force to the parking cam 16 on the basis of the parking limit plate 15, and the torsional elastic force enables the boss 21 of the parking cam 16 to be elastically pressed against the first limit surface 34; the parking limit plate 15 is rotatable relative to the parking cam 16 against the torsional elastic force, so that the boss 21 moves relative to the second limit surface 35.

In this embodiment, the elastic member 38 is optionally a torsion spring 39, and the torsion spring 39 is sleeved on the driving rotating shaft 14 and has one end connected to the driving rotating shaft 14 and the other end connected to the boss 21 of the parking cam 16 after passing through the limiting groove 20, so as to indirectly form a torsional elastic force between the parking limiting plate 15 and the parking cam 16 through the driving rotating shaft 14. Alternatively, a mounting pin 40 is vertically penetrated on the driving rotating shaft 14, and one end of the torsion spring 39 is connected to the driving rotating shaft 14 through the mounting pin 40.

The working surface 25 of the parking cam 16 abuts against a side of the parking pawl 28 remote from the pawl teeth 30 to define an extreme position in which the parking pawl 28 is remote from the parking ratchet 13; the third and fourth limit surfaces 36, 37 can support the guide pin 29 to define an extreme position of the parking pawl 28 in the direction approaching the parking ratchet 13 by the guide pin 29. In the parking state, the second surface section 23 of the parking cam 16 abuts against the parking pawl 28, and the fourth limit surface 37 supports the parking pawl 28 through the guide pin 29; in the non-parking state, the first surface section 22 of the parking cam 16 corresponds to the parking pawl 28 to define an extreme position of the parking pawl away from the parking ratchet direction, and the third limit surface 36 supports the parking pawl 28 via the guide pin 29.

In this embodiment, optionally, a roller 43 is rotatably disposed on one side of the parking pawl 28 corresponding to the working surface 25 of the parking cam 16, and the parking pawl 28 is in abutting fit with the working surface 25 through the roller 43. Alternatively, the roller 43 is rotatably provided on the end of the guide pin 29 connected to the parking pawl 28 at a widthwise intermediate position of the parking pawl 28. In this embodiment, the guide pin 29 is used to cooperate with the limit groove 20 for guiding, and can be used as the rotation shaft 33 of the roller 43 to reduce the frictional resistance between the parking cam 16 and the parking pawl 28.

Referring again to fig. 1-3, in this embodiment, the pivoting parking mechanism 10 further includes a locking spring steel ball 44. A sector area 45 with a sector-shaped plate surface is arranged on the radial outer side of the parking limit plate 15; a positioning corrugated groove 46 is formed in the plate surface at one axial end of the fan-shaped area 45; the positioning wave grooves 46 include parking notch grooves 47 and non-parking notch grooves 48; the parking groove 47 and the non-parking groove 48 are transitionally connected to each other. The locking spring steel balls 44 are arranged in parallel with the driving rotating shaft, vertically correspond to the positioning wave-shaped grooves 46, and can be elastically pressed into the positioning wave-shaped grooves 46, so that the arrangement space of the whole mechanism is greatly reduced; and when the locking spring steel ball 44 falls into the parking stop groove 47 or the non-parking stop groove 48, a certain resistance can be applied to limit the rotation of the parking limit plate 15. When the parking limit plate 15 rotates to enable the parking stop groove 47 of the parking limit plate to correspond to the locking spring steel ball 44, the parking limit plate 15 is in a parking state; when the parking restriction plate 15 is rotated such that the non-parking step groove 48 thereof corresponds to the lock spring steel ball 44, the parking restriction plate 15 is in the non-parking state.

When the rotary shaft type parking mechanism 10 in the scheme needs to park, an external parking motor or a mechanical rocker arm and the like drive the rotary shaft 14 to rotate along the parking direction; the parking limit plate 15 rotates along with the same direction; there are two cases at this time:

the first condition is as follows: when the pawl teeth 30 correspond to the tooth grooves 27 of the parking ratchet wheel 13, the parking limiting plate 15 drives the parking cam 16 to rotate through the elastic piece 38, the third section 24 of the parking cam 16 extrudes the parking pawl 28, and the pawl teeth 30 of the parking pawl 28 move to the first position 31 and enter the tooth grooves 27 of the parking ratchet wheel 13; after the rotating shaft 14 is driven to rotate to the P-gear (i.e. parking gear) position, the parking cam 16 is limited to a corresponding angle by the first limiting surface 34 of the parking limiting plate 15, the guide pin 29 on the parking pawl 28 is limited to a fixed height by the fourth limiting surface 37 of the parking limiting plate 15 and cannot fall continuously, and meanwhile, the parking pawl 28 is limited below the second surface section 23 of the parking cam 16 and cannot go upwards, so that the pawl tooth 30 of the parking pawl 28 is kept at a proper position clamped in the tooth socket 27, and a parking state is achieved; at this time, the steel ball on the locking spring steel ball 44 falls into the parking stop groove 47 on the parking limit plate 15, so that the parking limit plate 15 and the driving rotating shaft 14 can be kept at the parking stop position;

case two: when the pawl teeth 30 correspond to the non-tooth grooves 27 of the parking ratchet wheel 13, the parking pawl 28 cannot continuously rotate to the parking position, the driving rotating shaft 14 rotates to a P-gear angle, the parking limiting plate 15 synchronously rotates to the P-gear angle, the parking cam 16 is limited by the parking pawl 28 and cannot continuously rotate, at the moment, the parking cam 16 and the driving rotating shaft 14 rotate relatively, the rotation is converted into a torsional deformation angle of the elastic piece 38, the torsion is increased, and energy is stored; at the moment, the steel ball on the locking spring steel ball 44 falls into the parking gear groove 47 on the parking limit plate 15, so that the parking limit plate 15 and the driving rotating shaft 14 can be kept in the parking gear position without returning, when the vehicle moves, the parking ratchet wheel 13 gradually rotates to the position where the tooth groove 27 of the parking ratchet wheel corresponds to the pawl tooth 30, so that under the torsion action of the elastic piece 38, the parking cam 16 can continuously rotate to the P-gear angle, and presses down the parking pawl 28 to enter the tooth groove 27 of the parking ratchet wheel 13, so that the parking state is achieved;

that is, in the parking state, the fourth stopper surface 37 completely restricts the position of the parking pawl 28 by restricting the lower limit position of the parking pawl 28 by the guide pin 29 and restricting the upper limit position of the parking pawl 28 by the second surface section 23 of the parking cam 16.

When the parking is required to be released to enter a non-parking state, the driving rotating shaft 14 is driven to rotate along the direction opposite to the parking direction, and the parking limit plate 15 rotates along with the driving rotating shaft; the parking cam 16 and the parking limiting plate 15 synchronously rotate through the contact transmission of the first limiting surface 34 on the parking limiting plate 15 and the boss 21 of the parking cam 16, the fourth limiting surface 37 of the limiting groove 20 on the parking limiting plate 15 rotates relative to the rotating axis in the direction away from the parking ratchet wheel 13, the parking pawl 28 moves to the second position 32 under the driving of the guide pin 29 of the parking pawl on the third limiting surface 36 of the parking limiting plate 15, so that the pawl tooth 30 of the parking pawl 28 is separated from the tooth socket 27, the action of parking release is completed, and the parking state is entered; at this time, the third stopper surface 36 completely restricts the position of the parking pawl 28 by restricting the lower limit position of the parking pawl 28 by the guide pin 29 and restricting the upper limit position of the parking pawl 28 by the first surface section 22 of the parking cam 16. At the moment, the steel ball on the locking spring steel ball 44 falls into the non-parking groove 48 on the parking limit plate 15, so that the parking limit plate 15 and the driving rotating shaft 14 can be kept in a non-parking position;

in the scheme, the matching relation between each groove surface of the limiting groove 20, the boss 21 and the parking pawl 28 on the parking cam 16 and the limiting groove 20 and the matching relation between the working surface 25 of the parking cam 16 and the parking pawl 28 are reasonably arranged, so that the limiting groove 20 can transmit the parking cam 16 and guide and transmit the parking pawl 28, the operation of parking and parking releasing can be conveniently realized by the rotary shaft type parking mechanism 10, and the position of the parking pawl 28 in the parking state and the non-parking state can be reliably limited. Furthermore, as described above, the parking action of the pawl tooth 30 corresponding to the tooth slot 27 or non-tooth slot tooth face of the parking ratchet 13 can be accommodated. Through the structure, the parking structure can be more compact and reliable.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.