CN108644371A - A kind of parking gear shifting mechanism - Google Patents

Abstract

The invention discloses a parking shifting mechanism, which includes a driving module, a shifting module and a parking module; the driving module includes a ball screw, a driving motor and a shift fork, and the driving motor is connected with a screw shaft. The shift fork is connected to the nut; the shift module includes a unilateral synchronizer connected to the shift fork, and the unilateral synchronizer can perform shifting and shifting with the movement of the shift fork. Reverse gear; the parking module includes a parking push rod assembly, a parking arm and a parking gear, the parking push rod assembly is connected to the shift fork, and is arranged on the non-changeable side of the unilateral synchronizer The parking push rod assembly can move with the shift fork, so that the parking arm meshes with the parking gear to realize parking. The invention combines two completely independent functions of gear shifting and parking by using a single-side synchronizer, and has the advantages of low production and development costs and a more compact structure.

Description

A parking shift mechanism

technical field

The invention relates to the field of automobiles, in particular to a parking shift mechanism.

Background technique

At present, hybrid vehicles with engines and electric motors account for a large proportion of new energy vehicles, while the power switching of hybrid vehicles mainly relies on multi-mode reducers. Therefore, in addition to the gear set used for deceleration and torque increase, the multi-mode reducer must also have a parking function and a power ON/OFF function.

Whether it is a traditional fuel vehicle or a new energy hybrid vehicle, it needs to be equipped with a special transmission chain for parking. Therefore, many components need to be developed, including parking motor and controller, parking shift shaft, parking angle sensor, parking pawl, parking push rod, parking cam, parking arm, parking gear, etc. . In addition, the power ON/OFF function is realized through the clutch: step on the clutch, the power is cut off to perform operations such as shifting; release the clutch, and the power is re-output. These two functions can only be realized by setting up two separate mechanisms. There are many parts in the parking assembly, and the cost of the clutch itself is relatively high, resulting in an increase in the development and production costs of the multi-mode reducer, and the difficulty of space layout. The problem.

The Chinese patent with the application number CN201410580172.0 discloses a transmission shift and parking mechanism. The transmission shift and parking mechanism includes a parking part and a shifting part. The shifting part and the parking part pass through the roller bar assembly The connection is established; the manual control shaft assembly of the shifting part drives the positioning plate and the finger driven structure to rotate. According to the different rotation angles, the locking structure is stuck in the tooth groove, and the finger driven structure drives the manual valve to move in a straight line in the hydraulic valve body. Reciprocating movement, thereby opening and closing the P, R, N, D gear oil circuits in the hydraulic valve body. It improves the parking part and the gear shifting part, and solves the problems that the existing parking mechanism has a complex structure of the control oil circuit, easy interference of individual parts, and poor parking and gear shifting effect when the existing parking mechanism is performing gear shifting and parking. However, its mechanism composition is still relatively complicated, and the two functions of shifting and parking are not connected.

Contents of the invention

In order to solve the above technical problems, the present invention provides a parking shift mechanism, which includes a drive module, a shift module and a parking module;

The drive module includes a ball screw, a drive motor and a shift fork, the ball screw includes a screw shaft and a nut; the drive motor is connected to the screw shaft, the shift fork is connected to the nut, and The shift fork can move along with the nut along the axial direction of the screw shaft;

The shift module includes a unilateral synchronizer; the unilateral synchronizer is connected to the shift fork, and the unilateral synchronizer can perform gear shifting and backshifting with the movement of the shift fork;

The parking module includes a parking push rod assembly, a parking arm and a parking gear; the parking push rod assembly is connected to the shift fork and is arranged on the non-shift side of the unilateral synchronizer The parking push rod assembly can move with the shift fork, so that the parking arm is meshed with the parking gear to realize parking.

Further, the parking push rod assembly includes a parking push rod, a parking cam and a spring;

The parking cam is connected to one end of the parking push rod, the other end of the parking push rod is connected to the shift fork, the spring is arranged on the parking push rod, and the spring is used for Provides preload to the park cam.

Further, the parking cam is a cylinder with a tapered end surface, and the parking arm is provided with a groove; the parking cam gradually fits into the groove as the shift fork moves; when When the parking cam is completely engaged with the groove, the parking arm is engaged with the parking gear.

Further, the parking gear is fixedly connected with the output shaft of the transmission.

Further, the unilateral synchronizer includes a gear hub and a gear sleeve, the gear hub is fixedly connected to the output shaft of the transmission, the gear sleeve is connected to the shift fork, and the gear sleeve can be positioned on the shift fork. Under the action, the gear hub moves close to or away from the gear gear to realize gear shifting or back gearing.

Further, the tooth sleeve is provided with an annular groove, and one end of the shift fork is arranged in the annular groove.

Further, the gear gear is connected with the output shaft of the transmission through a needle bearing.

Further, the drive module further includes a controller, the controller is electrically connected to the drive motor, and the controller and the drive motor are fixedly arranged on the transmission housing; the two ends of the ball screw are respectively It is fixed in the transmission by bearings.

Further, the drive module further includes a shift fork position detection unit, the shift fork position detection unit includes a magnetic block and a sensor, the magnetic block is fixedly arranged on the shift fork, and the sensor determines the shift position by detecting a magnetic signal. fork position.

Further, the shift parking mechanism also includes a locking module, the locking module includes a locking wire groove and a positioning seat, the locking wire groove is fixedly connected with the nut, and the locking wire groove is fixedly connected to the nut. There is at least one limiting groove; one end of the positioning seat is provided with a protrusion, and the protrusion can be stuck in the limiting groove.

Further, the locking wire groove is sequentially provided with a shift groove, a neutral groove and a parking groove; when the mechanism is in a neutral state, the protrusion is stuck in the neutral groove; when the mechanism is parked, The protrusion is stuck in the parking slot; when the gear shifting of the mechanism is completed, the protrusion is stuck in the shift slot. That is, the locking module locks the movement of the nut so that the mechanism is locked in the state of neutral, parking or shifting.

The parking shift mechanism of the present invention can realize neutral gear, gear shifting and parking functions, and its principle is respectively as follows:

(1) Neutral gear principle: when the driving motor is not working, the gear sleeve of the unilateral synchronizer does not contact the gear gear, the parking cam does not contact the parking arm, and the protrusion of the positioning seat is snapped into the neutral gear slot; , the output shaft of the transmission has no power output, the parking arm does not mesh with the parking gear, and the mechanism is in neutral state;

(2) Shifting principle: when the drive motor rotates forward, the ball screw converts the rotational motion of the screw shaft into the linear motion of the nut, and drives the tooth sleeve to move to the gear through the shift fork to shift gears; and, when After the drive motor is reversed, the shift fork can drive the gear sleeve to disengage from the gear gear to achieve back gear;

(3) Parking principle: when the driving motor reverses, the shift fork drives the push rod assembly to move to the parking arm, and the parking cam makes the parking arm gradually mesh with the parking gear to realize parking; and, when the driving motor After forward rotation, the parking arm gradually disengages from the parking gear to complete the parking unlock.

In addition, in addition to being able to connect with the shift fork, the parking push rod in the present invention can also be hinged on the nut of the ball screw.

The ball screw can decelerate and increase torque, and convert the rotary motion into a linear motion, thereby driving the shift fork to drive the synchronizer to realize gear shifting and the parking module to realize parking. Therefore, a device or mechanism that can generate linear motion can become an alternative to the ball screw under the conditions of satisfying the speed and torque. For example, replace the ball screw with a rack-and-pinion plus worm gear structure or a rack-and-pinion plus gear pair structure; or directly use a device that outputs linear motion, such as pneumatic drive, hydraulic drive, or shifting flexible shaft drive.

Moreover, since the ball screw has self-locking performance, the locking module in the present invention can also be removed. However, for other alternatives without self-locking performance, the locking module should be retained.

The present invention combines two completely independent functions of shifting and parking by utilizing a single-side synchronizer. The shifting side of the unilateral synchronizer can replace the clutch to realize the power ON/OFF function, and the non-shifting side of the unilateral synchronizer can realize the parking function. It has the following beneficial effects:

(1) Replace the expensive and oversized clutch with a cheap and small unilateral synchronizer, thereby greatly reducing the production cost of the reducer;

(2) The parking module is integrated on the non-shift side of the unilateral synchronizer, and components such as the parking motor, parking pawl, positioning seat, parking rocker arm and angle sensor are eliminated, which greatly simplifies parking The structure reduces the number of parts, reduces the cost of research and development, simplifies the difficulty of space layout, and makes the structure of the whole box more compact.

Description of drawings

In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Apparently, the appended The drawings are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of the parking shift mechanism of the present invention when it is in a neutral state;

Fig. 2 is a schematic structural view of the parking shift mechanism of the present invention when it is in a shift state;

Fig. 3 is a structural schematic diagram of the parking shift mechanism of the present invention in a parking state.

Among them, the corresponding marks of the drawings in the figure are: 1-drive motor; 2-controller; 3-locking module; 301-locking slot; 302-locating seat; Unit; 501-magnetic block; 502-sensor; 6-ball screw; 601-screw shaft; 602-nut; 7-shift fork; 8-unilateral synchronizer; 801-gear hub; 802-gear sleeve; - Parking push rod assembly; 901- Parking push rod; 902- Parking cam; 903- Spring; 10- Parking arm; 11- Parking gear; 12- Output shaft.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiment is only one embodiment of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom" etc. Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. Also, the terms "first", "second", etc. are used to distinguish similar items and not necessarily to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein.

Example:

As shown in Figures 1-3, the present invention provides a parking shift mechanism, which includes a drive module, a shift module and a parking module;

The drive module includes a ball screw 6, a drive motor 1 and a shift fork 7, and the ball screw 6 includes a screw shaft 601 and a nut 602; the drive motor 1 is connected to the screw shaft 601, and the dial The fork 7 is connected to the nut 602, and the shift fork 7 can move left and right along with the nut 602 along the axial direction of the screw shaft 601;

The shift module includes a unilateral synchronizer 8; the unilateral synchronizer 8 is connected to the shift fork 7, and the unilateral synchronizer 8 can perform gear shifting and backshifting with the movement of the shift fork 7 ;

The parking module includes a parking push rod assembly 9, a parking arm 10 and a parking gear 11; the parking push rod assembly 9 is connected to the shift fork 7 and is arranged on the unilateral synchronizer 8 Non-shifting side: the parking push rod assembly 9 can move with the shift fork 7, so that the parking arm 10 meshes with the parking gear 11 to realize parking.

Further, the parking push rod assembly 9 includes a parking push rod 901, a parking cam 902 and a spring 903;

The parking cam 902 is connected to one end of the parking push rod 901 , the other end of the parking push rod 901 is connected to the shift fork 7 , and the spring 903 is arranged on the parking push rod 901 , the spring 903 is used to provide the pre-tightening force of the parking cam 902 .

Further, the parking cam 902 is a cylinder with a tapered end surface, and the parking arm 10 is provided with a groove; the parking cam 902 gradually aligns with the groove as the shift fork 7 moves Attachment: when the parking cam 902 is fully engaged with the groove, the parking arm 10 is engaged with the parking gear 11 .

Further, the parking gear 11 is fixedly connected with the output shaft 12 of the transmission.

Further, the unilateral synchronizer 8 includes a gear hub 801 and a gear sleeve 802, the gear hub 801 is fixedly connected with the output shaft 12 of the transmission, the gear sleeve 802 is connected with the shift fork 7, and the gear sleeve 802 can be moved along the gear hub 801 to approach or move away from the range gear 4 under the action of the shift fork 7 to realize gear shifting or back gearing.

Further, the tooth sleeve 802 is provided with an annular groove, and one end of the shift fork 7 is disposed in the annular groove.

Further, the shift gear 4 is connected with the output shaft 12 of the transmission through a needle bearing.

Further, the drive module also includes a controller 2, the controller 2 is electrically connected to the drive motor 1, and the controller 2 and the drive motor 1 are fixedly arranged on the transmission housing; the ball wire The two ends of bar 6 are respectively fixed in the transmission by bearings.

Further, the drive module also includes a shift fork position detection unit 5, the shift fork position detection unit 5 includes a magnetic block 501 and a sensor 502, the magnetic block 501 is fixed on the shift fork 7, the sensor 502 determines the position of the shift fork 7 by detecting the magnetic signal.

Further, the shift parking mechanism also includes a locking module 3, the locking module 3 includes a locking wire slot 301 and a positioning seat 302, and the locking wire slot 301 is fixedly connected with the nut 602, so that At least one limiting slot is provided on the locking wire slot 301; a protrusion is provided at one end of the positioning seat 302, and the protrusion can be stuck in the limiting slot.

Further, the locking wire slot 301 is provided with a shift slot, a neutral slot and a parking slot in sequence; when the mechanism is in a neutral state, the protrusion is stuck in the neutral slot; when the mechanism is parked , the protrusion is stuck in the parking groove; when the gear shifting of the mechanism is completed, the protrusion is stuck in the shift groove. That is, the locking module 3 locks the movement of the nut 602 so that the mechanism is locked in the state of neutral, parking or gear shifting.

The parking shift mechanism of the present invention can realize neutral gear, gear shifting and parking functions, and its principle is respectively as follows:

As shown in Figure 1, the principle of neutral gear is: when the driving motor 1 is not working, the gear sleeve 802 of the unilateral synchronizer 8 does not contact the gear gear 4, the parking cam does not contact the parking arm 10, and the positioning seat 302 The projection is snapped into the neutral slot (i.e. the neutral slot); at this moment, the output shaft 12 of the speed changer has no power output, the parking arm 10 is not meshed with the parking gear 11, and the mechanism is in the neutral state.

As shown in Figure 2, the principle of shifting is: when the drive motor 1 rotates forward, the ball screw 6 converts the rotational motion of the screw shaft 601 into the linear motion of the nut 602, and drives the gear sleeve 802 to the right through the shift fork 7 and, when the driving motor 1 reverses, the shift fork 7 can drive the gear sleeve 802 to move to the left, so as to disengage from the gear 4 to realize a reverse gear.

As shown in Figure 3, the principle of parking is: when the driving motor 1 is reversed, the shift fork 7 drives the parking push rod assembly 9 to move to the left, and the parking cam 902 makes the parking arm 10 mesh with the parking gear 11 gradually , to realize parking; and, when the drive motor 1 rotates forward, the parking push rod assembly 9 moves to the right, and the parking arm 10 gradually disengages from the parking gear 11 to complete the parking unlock.

In addition, since the ball screw is self-locking, the locking module in this embodiment can increase the reliability of locking the mechanism in a certain state, and is not necessary.

In addition, in addition to being able to connect with the shift fork 7, the parking push rod 901 in the present invention can also be hinged on the nut 602 of the ball screw 6 to realize left and right movement.

Example:

As shown in Figures 1-3, the present invention provides a parking shift mechanism, which includes a drive module, a shift module and a parking module;

The drive module includes a hydraulic unit and a shift fork 7, the hydraulic unit includes a hydraulic cylinder, the shift fork 7 is connected to the piston rod of the hydraulic cylinder, the shift fork 7 can follow the piston rod along the The cylinder barrel of the hydraulic cylinder moves;

The shift module includes a unilateral synchronizer 8; the unilateral synchronizer 8 is connected to the shift fork 7, and the unilateral synchronizer 8 can perform gear shifting and backshifting with the movement of the shift fork 7 ;

The parking module includes a parking push rod assembly 9, a parking arm 10 and a parking gear 11; the parking push rod assembly 9 is connected to the shift fork 7 and is arranged on the unilateral synchronizer 8 Non-shifting side: the parking push rod assembly 9 can move with the shift fork 7, so that the parking arm 10 meshes with the parking gear 11 to realize parking.

Further, the parking push rod assembly 9 includes a parking push rod 901, a parking cam 902 and a spring 903;

The parking cam 902 is connected to one end of the parking push rod 901 , the other end of the parking push rod 901 is connected to the shift fork 7 , and the spring 903 is arranged on the parking push rod 901 , the spring 903 is used to provide the pre-tightening force of the parking cam 902 .

Further, the parking cam 902 is a cylinder with a tapered end surface, and the parking arm 10 is provided with a groove; the parking cam 902 gradually aligns with the groove as the shift fork 7 moves Attachment: when the parking cam 902 is fully engaged with the groove, the parking arm 10 is engaged with the parking gear 11 .

Further, the parking gear 11 is fixedly connected with the output shaft 12 of the transmission.

Further, the unilateral synchronizer 8 includes a gear hub 801 and a gear sleeve 802, the gear hub 801 is fixedly connected with the output shaft 12 of the transmission, the gear sleeve 802 is connected with the shift fork 7, and the gear sleeve 802 can be moved along the gear hub 801 to approach or move away from the range gear 4 under the action of the shift fork 7 to realize gear shifting or back gearing.

Further, the tooth sleeve 802 is provided with an annular groove, and one end of the shift fork 7 is disposed in the annular groove.

Further, the shift gear 4 is connected with the output shaft 12 of the transmission through a needle bearing.

Further, the hydraulic unit further includes a solenoid valve connected to the hydraulic cylinder through an oil pipe for controlling the movement of the piston rod of the hydraulic cylinder.

Further, the drive module also includes a controller, the controller is electrically connected to the solenoid valve, and the controller and the solenoid valve are fixed on the transmission housing; the cylinder barrel of the hydraulic cylinder is fixed on the inside the transmission.

Further, the drive module also includes a shift fork position detection unit 5, the shift fork position detection unit 5 includes a magnetic block 501 and a sensor 502, the magnetic block 501 is fixed on the shift fork 7, the sensor 502 determines the position of the shift fork 7 by detecting the magnetic signal.

Further, the shift parking mechanism also includes a locking module 3, the locking module 3 includes a locking wire groove 301 and a positioning seat 302, the locking wire groove 301 is fixedly connected with the piston rod, so At least one limiting slot is provided on the locking wire slot 301; a protrusion is provided at one end of the positioning seat 302, and the protrusion can be stuck in the limiting slot.

Further, the locking wire slot 301 is provided with a shift slot, a neutral slot and a parking slot in sequence; when the mechanism is in a neutral state, the protrusion is stuck in the neutral slot; when the mechanism is parked , the protrusion is stuck in the parking groove; when the gear shifting of the mechanism is completed, the protrusion is stuck in the shift groove. That is, the locking module 3 locks the movement of the piston rod, so that the mechanism is locked in the state of neutral, parking or shifting.

The parking shift mechanism of the present invention can realize neutral gear, gear shifting and parking functions, and its principle is respectively as follows:

Combined with Figure 1, the principle of neutral gear is: when the hydraulic cylinder is not working, the piston rod of the hydraulic cylinder extends a distance from one end, the tooth sleeve 802 of the unilateral synchronizer 8 does not contact the gear gear 4, and the parking cam does not contact the parking gear. When the arm 10 contacts, the projection of the positioning seat 302 snaps into the neutral slot (ie, the neutral slot); at this time, the output shaft 12 of the transmission has no power output, the parking arm 10 does not mesh with the parking gear 11, and the mechanism is in neutral state.

Combined with Figure 2, the principle of shifting is as follows: the hydraulic cylinder works, the piston rod can stretch back and forth in the cylinder, the piston rod drives the shift fork 7 to drive the tooth sleeve 802 to move to the right, and engages with the gear gear 4 to shift gears; in addition, the piston The rod can also drive the shift fork 7 to drive the gear sleeve 802 to move leftward, so as to disengage from the gear 4 and realize back gearing.

Combined with Fig. 3, the principle of parking is as follows: the hydraulic cylinder works, the piston rod drives the shift fork 7 to drive the parking push rod assembly 9 to move to the left, and the parking cam 902 makes the parking arm 10 gradually mesh with the parking gear 11 to realize parking. Car; Similarly, the piston rod can also drive the shift fork 7 to drive the parking push rod assembly 9 to move to the right, and the parking arm 10 will gradually break away from the parking gear 11 to complete the parking unlock.

In this embodiment, the hydraulic cylinder is used as the driving device of the parking shift mechanism, on the one hand because the hydraulic cylinder can directly output the form of linear motion, and its output force is relatively controllable; on the other hand, because the hydraulic pressure required by the hydraulic cylinder The oil can be obtained directly from the vehicle without adding other units, which can save space and cost.

In addition, the hydraulic cylinder can be held in a certain position, so the locking module in this embodiment is not necessary. And, in addition to being connected to the shift fork 7, the parking push rod 901 in this embodiment can also be hinged on the piston rod to realize left and right movement.

Both the ball screw and the hydraulic unit output linear motion to drive the left and right movement of the shift fork, so as to realize the two functions of shifting and parking. Therefore, it can be clearly known that a device or mechanism capable of generating linear motion can be an alternative to a ball screw or a hydraulic cylinder under the condition of satisfying the rotational speed and torque. For example, replace the ball screw with a rack-and-pinion plus worm gear structure or a rack-and-pinion plus gear pair structure; or directly use a device that outputs linear motion, such as pneumatic drive, hydraulic drive, or shifting flexible shaft drive.

The above description is a preferred embodiment of the present invention, and it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the protection scope of the present invention.

Claims (10)

1. a kind of parking gear shifting mechanism, which is characterized in that the parking gear shifting mechanism includes drive module, shift module and parking Module；

The drive module includes ball-screw (6), driving motor (1) and shift fork (7), and the ball-screw (6) includes leading screw Axis (601) and nut (602)；The driving motor (1) connect with the lead screw shaft (601), the shift fork (7) and the nut (602) it connects, the shift fork (7) can be as the nut (602) be along the axis direction movement of the lead screw shaft (601)；

The shift module includes Unilateral synchronizer (8)；The Unilateral synchronizer (8) connect with the shift fork (7), described unilateral Gear can be shifted gears and be moved back to synchronizer (8) with the shift fork (7) movement；

The parking module includes parking push rod assembly (9), parking arm (10) and parking gear (11)；The parking push rod assembly (9) it is connect with the shift fork (7), and is set to the non-shift side of the Unilateral synchronizer (8)；The parking push rod assembly (9) It can be mobile with the shift fork (7) so that the parking arm (10) is engaged with the parking gear (11) realizes parking.

2. a kind of parking gear shifting mechanism according to claim 1, which is characterized in that the parking push rod assembly (9) includes Parking push rod (901), parking cam (902) and spring (903)；

The parking cam (902) connect with one end of the parking push rod (901), the other end of the parking push rod (901) It is connect with the shift fork (7), the spring (903) is set on the parking push rod (901), and the spring (903) is for carrying For the pretightning force of the parking cam (902).

3. a kind of parking gear shifting mechanism according to claim 2, which is characterized in that the parking cam (902) be equipped with The cylinder of tapered end face, the parking arm (10) are equipped with groove；The parking cam (902) with shift fork (7) movement Gradually it is bonded with the groove；When the parking cam (902) is bonded completely with the groove, the parking arm (10) and institute State parking gear (11) engagement.

4. a kind of parking gear shifting mechanism according to claim 1, which is characterized in that the parking gear (11) and speed changer Output shaft (12) be fixedly connected.

5. a kind of parking gear shifting mechanism according to claim 1, which is characterized in that the Unilateral synchronizer (8) includes tooth Hub (801) and tooth set (802), the tooth set (802) connect with the shift fork (7), and the tooth set (802) can be in the shift fork (7) it realizes shift close to either separate shifting gear (4) under the action of or moves back gear.

6. a kind of parking gear shifting mechanism according to claim 5, which is characterized in that the tooth set (802) is equipped with annular One end of slot, the shift fork (7) is set in the annular groove.

7. a kind of parking gear shifting mechanism according to claim 1, which is characterized in that the drive module further includes controller (2), the controller (2) is electrically connected with the driving motor (1), and the controller (2) and the driving motor (1) fixation are set It is placed on case of transmission；The both ends of the ball-screw (6) are fixed on by bearing in speed changer respectively.

8. a kind of parking gear shifting mechanism according to claim 1, which is characterized in that the drive module further includes shift fork position Detection unit (5) is set, the shift fork position detection unit (5) includes magnetic block (501) and sensor (502), the magnetic block (501) it is fixedly installed on the shift fork (7), the sensor (502) determines shift fork (7) position by detecting magnetic signal.

9. a kind of parking gear shifting mechanism according to claim 1, which is characterized in that the shift halting mechanism further includes lock Only module (3), the locking module (3) include locking wire casing (301) and positioning seat (302), the locking wire casing (301) and institute It states nut (602) to be fixedly connected, the locking wire casing (301) is equipped at least one limiting slot；The one of the positioning seat (302) End is equipped with protrusion, and the protrusion can be stuck in the limiting slot.

10. a kind of parking gear shifting mechanism according to claim 9, which is characterized in that set successively on the locking wire casing (301) There are shift limiting slot, neutral gear limiting slot and parking limiting slot；When mechanism is in neutral position state, the protrusion is stuck in the neutral gear In slot；When mechanism parking is completed, the protrusion is stuck in the parking slot；When mechanism, which shifts gears, to be completed, the protrusion is stuck in In the shift slot.