CN218347916U - Power transmission switching device and vehicle - Google Patents

Abstract

The utility model provides a power transmission auto-change over device and vehicle, power transmission auto-change over device include driving motor, drive wheel, hold power spring, runner, transmission shaft, strip tooth and shift fork, and driving motor is used for driving the drive wheel and rotates, and drive wheel, runner, transmission shaft, hold power spring, strip tooth transmission coordination in proper order, and the strip tooth links to each other with the shift fork, and the shift fork changes between block state and free state. The driving motor provides driving force to drive the shifting fork to move, the shifting fork shifts the front axle gear to be meshed or separated from the meshing, the switching of the power modes is realized, and the structure is simple and reliable. In addition, the force storage spring is adopted to store torque force so as to overcome external force, so that the driving device can normally operate to output torque under the condition that the shifting fork is blocked, and the application is flexible, simple and labor-saving.

Description

Power transmission switching device and vehicle

Technical Field

The utility model relates to a vehicle technical field specifically relates to a power transmission auto-change over device and vehicle.

Background

When a front-drive or rear-drive vehicle runs on a road section with poor road conditions (such as rainy and snowy weather and muddy roads), wheel skidding or driving difficulty easily occurs, and in the related technology, a two-drive switching four-drive mode is adopted to provide power for all wheels, so that the vehicle is helped to escape from danger. In particular to a multifunctional all-terrain vehicle, in order to endow the multifunctional all-terrain vehicle with stronger off-road performance and passing capacity, higher requirements are put on flexibility and reliability of a power switching process of the multifunctional all-terrain vehicle, a shifting fork is usually shifted in a manual mode in the related art to switch power modes of the vehicle, but the problems of jamming, labor waste and poor flexibility easily occur in manual operation.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the embodiment of the utility model provides a power transmission auto-change over device in flexibility strong, reliability chamber.

The embodiment of the utility model provides a still provide a vehicle that has above-mentioned power transmission auto-change over device.

The embodiment of the utility model provides a power transmission auto-change over device includes: driving motor, drive wheel, power storage spring, runner, transmission shaft, strip tooth and shift fork, driving motor is used for the drive wheel rotates, the drive wheel the power storage spring the runner the transmission shaft with the strip tooth is the transmission cooperation in proper order, the strip tooth with the shift fork links to each other, the shift fork has block state and free state, the drive wheel passes through power storage spring drives the runner rotates, so that the transmission shaft drives the strip tooth is along the reciprocating motion of first direction the block state, the shift fork receives the exogenic action, the drive wheel twists reverse power storage spring makes its storage torque force in order to overcome external force, thereby the drive the runner is rotatory, makes the shift fork conversion to free state.

The utility model provides a power transmission auto-change over device provides the removal that drive power drove the shift fork through driving motor, and the shift fork is stirred front axle gear engagement or is break away from the meshing, realizes the switching of power mode, and simple structure is reliable. In addition, the power storage spring is used for storing torque force to overcome external force, so that the driving device can normally operate to output torque under the condition that the shifting fork is clamped. When the power transmission switching device is applied to a vehicle, the on-off of the driving motor can be controlled by adopting the full electronic control unit, and the on-off of the driving motor can also be directly controlled by adopting the switch, so that the power switching is controlled, and the power transmission switching device is flexible to apply, simple and labor-saving.

In some embodiments, the outer circumferential surface of the output shaft of the driving motor is provided with a plurality of teeth, and the outer circumferential surface of the driving wheel is provided with a plurality of teeth, and the rotating teeth are engaged with the teeth, so that the driving wheel is driven to rotate by the rotation of the output shaft.

In some embodiments, the driving motor includes a motor, a driving wheel and a driven wheel, the motor drives the driving wheel to rotate, the driving wheel is engaged with the driven wheel, and the driven wheel is connected with the output shaft.

In some embodiments, the transmission wheel has a first engaging portion, and the power storage spring has a first end portion and a second end portion, and the first end portion and the second end portion respectively abut against the first engaging portion on two opposite sides in the circumferential direction of the transmission wheel; the runner has a second engaging portion, and at least one of the first end portion and the second end portion is opposed to the second engaging portion in the circumferential direction.

In some embodiments, the driving wheel comprises a driving wheel body, the driving wheel body comprises a cylinder body and a bottom connected with the cylinder body, the cylinder body and the bottom define an accommodating cavity with an opening facing the rotating wheel, and the first clamping part is connected with the bottom and extends towards a direction close to the rotating wheel; the rotating wheel comprises a cover plate, the cover plate is opposite to the accommodating cavity in the axial direction, and the second clamping part is connected with the cover plate and extends into the accommodating cavity.

In some embodiments, the first engaging portion and the second engaging portion are opposed in a radial direction of the cylinder, and the power spring is fitted over each of the first engaging portion and the second engaging portion.

In some embodiments, the first end of the power storage spring is away from the bottom portion relative to the second end, the first end is opposite to the second engaging portion in the circumferential direction, and the second end is located between the second engaging portion and the bottom portion in the axial direction.

In some embodiments, the driving wheel has a hollow column, the rotating wheel has a through hole, the transmission shaft includes a rotating shaft portion rotatably fitted in the hollow column, a stopper portion fitted in the through hole so that the rotating wheel and the transmission shaft are stopped from each other in forward and reverse circumferential directions, and a meshing portion meshed with the rack tooth.

In some embodiments, the through hole is a polygonal hole, and the limiting part is matched with the shape of the through hole.

In some embodiments, the outer peripheral surface of the meshing portion is provided with a plurality of teeth portions extending in the axial direction of the drive shaft.

In some embodiments, the power transmission switching device comprises a housing, and a portion of the drive motor, the drive wheel, the power storage spring, the wheel and the drive shaft are located within the housing, and another portion of the drive shaft extends from the housing to engage with the rack teeth.

An embodiment of another aspect of the present invention provides a vehicle including a power transmission switching device according to any one of the above embodiments.

Drawings

Fig. 1 is an exploded schematic view of a power transmission switching device according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a driving motor according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a transmission shaft according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a rack and a shift fork according to an embodiment of the present invention.

Fig. 5 is a front view of a schematic diagram of the engagement of the transmission wheel, the force storage spring and the rotating wheel provided by the embodiment of the present invention.

Fig. 6 is an exploded view of the driving wheel, the force storage spring and the rotating wheel provided by the embodiment of the utility model.

Fig. 7 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 5.

Reference numerals:

a power transmission switching device 100,

A driving motor 1, an output shaft 11, a rotating gear 12, a motor 13, a driving wheel 14, a driven wheel 15,

The transmission wheel 2, the first tooth part 21, the hollow column 22, the first clamping part 23, the cylinder 241, the bottom 242, the accommodating cavity 25, the power storage spring 3, the first end part 31, the second end part 32,

The runner 4, a through hole 41, a second engaging portion 42, a cover plate 43,

A transmission shaft 5, a rotating shaft part 51, a limit part 52, a meshing part 53, a second tooth part 531,

A rack gear 6, a third gear 61, a shift fork 7,

A housing 81, a housing cover 82, and a motor pressure plate 9.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A power transmission switching apparatus 100 according to an embodiment of the present invention will be described below with reference to fig. 1 to 7. The power transmission switching device comprises a driving motor 1, a driving wheel 2, a force storage spring 3, a rotating wheel 4, a transmission shaft 5, a rack 6 and a shifting fork 7, wherein the driving motor 1 is used for driving the driving wheel 2 to rotate, the driving wheel 2, the force storage spring 3, the rotating wheel 4, the transmission shaft 5 and the rack 6 are in transmission fit in sequence, namely, the driving motor 1 drives the driving wheel 2 to rotate, the driving wheel 2 can drive the rotating wheel 4 to rotate through the force storage spring 3, the rotating wheel 4 can drive the transmission shaft 5 to rotate, and the transmission shaft 5 can drive the rack 6 to move. The force storage spring 3 is matched between the transmission wheel 2 and the rotating wheel 4, and can play a role in storing the torque force of the driving motor 1.

The rack gear 6 is connected with a shifting fork 7, and the shifting fork 7 is switched between a clamping state and a free state. The removal of rack 6 can drive shift fork 7 and remove, and when shift fork 7 received the exogenic action card dead in the block state, rack 6 also can't remove, and then transmission shaft 5 and runner 4 all can't rotate.

At the free state, drive wheel 2 drives runner 4 through storing power spring 3 and rotates so that transmission shaft 5 drives rack 6 and follows the reciprocating motion of first direction, that is to say, when shift fork 7 is located the free state, it does not receive exogenic action, can follow the removal of rack 6 and remove, driving motor 1 drive wheel 2 this moment rotates, drive wheel 2 drives runner 4, runner 4 drives transmission shaft 5, transmission shaft 5 drives rack 6 and follows the reciprocating motion of first direction, the removal of rack 6 and then drives shift fork 7 and follow the reciprocating motion of first direction. It should be noted that the reciprocating movement of the rack teeth 6 means that the rack teeth can move back and forth along two directions in the first direction, and is realized by the forward and reverse operations of the driving motor 1, that is, the driving motor 1 can drive the driving wheel 2 to rotate forward and reverse to make the rack teeth 6 move back and forth along the first direction.

At the block state, shift fork 7 receives the exogenic action, and the rack tooth 6, transmission shaft 5 and runner 4 all can't remove or rotate under the effect of exogenic action this moment, need overcome exogenic action and make shift fork 7 remove. The driving motor 1 drives the driving wheel 2 to rotate, the driving wheel 2 twists and stores the force spring 3 so that the force spring can store torque to overcome external force, when the external force disappears or the force spring 3 stores torque larger than the external force, the force spring 3 drives the rotating wheel 4 to rotate, the shifting fork 7 is switched to a free state, and the rotating wheel 4 drives the transmission shaft 5 to rotate at the moment, so that the rack teeth 6 and the shifting fork 7 are driven to move.

Alternatively, the power transmission switching device 100 may be used for power transmission and switching at the front wheels of an all-terrain vehicle, the shifting fork 7 is used for shifting the front axle gear to engage or disengage, the front axle gear is engaged, the front wheels are in a driving state, the all-terrain vehicle is changed from rear drive to four drive, the front axle gear is disengaged, the front wheels are in a driven state, and the all-terrain vehicle is in rear drive. When the front axle gear is engaged, the shifting fork 7 is in a clamping state.

The utility model provides a power transmission auto-change over device provides the removal that drive power drove the shift fork through driving motor, and the shift fork is stirred front axle gear engagement or is break away from the meshing, realizes the switching of power mode, and simple structure is reliable. In addition, the power storage spring is used for storing torque force to overcome external force, so that the driving device can normally operate to output torque under the condition that the shifting fork is blocked. When the power transmission switching device is applied to a vehicle, the on-off of the driving motor can be controlled by adopting the full electronic control unit, and the on-off of the driving motor can also be directly controlled by adopting the switch, so that the power switching is controlled, and the power transmission switching device is flexible to apply, simple and labor-saving.

In some embodiments, as shown in fig. 1 and 2, the outer circumferential surface of the output shaft 11 of the drive motor 1 is provided with rotating teeth 12, and the rotating teeth 12 are helical. The peripheral surface of the transmission wheel 2 is provided with a plurality of first tooth parts 21, the first tooth parts 21 extend along the axial direction of the transmission wheel 2, and the rotating teeth 12 are meshed with the first tooth parts 21 so that the rotation of the output shaft 11 drives the transmission wheel 2 to rotate.

Specifically, as shown in fig. 1 and 2, the drive motor 1 includes a motor 13, a drive pulley 14, and a driven pulley 15. The driving wheel 14 is directly connected with the output end of the motor 13, the driven wheel 15 is positioned at one side of the driving wheel 14, the driving wheel 14 is meshed with the driven wheel 15, and the driven wheel 15 is connected with the output shaft 11. The motor 13 drives the driving wheel 14 to rotate, the driving wheel 14 rotates to drive the driven wheel 15 to rotate, the driven wheel 15 drives the output shaft 11 to rotate around the central axis of the output shaft, and the rotation of the output shaft 11 drives the transmission wheel 2 meshed with the output shaft to rotate. It will be appreciated that the direction of rotation of the output shaft 11 of the drive motor 1 determines the direction of rotation of the drive wheel 2, and that the output shaft 11 may control the drive wheel 2 to rotate in either a forward or reverse direction.

In some embodiments, as shown in fig. 5 to 7, the transmission wheel 2 has a first engaging portion 23, the first engaging portion 23 has two end surfaces in the circumferential direction of the transmission wheel 2, the power storage spring 3 has a first end portion 31 and a second end portion 32, and the first end portion 31 and the second end portion 32 respectively abut against two end surfaces of the first engaging portion 23 opposite to each other in the circumferential direction of the transmission wheel 2, so that the transmission wheel 2 rotates in the forward and reverse directions to drive the power storage spring 3 to rotate or store power. The wheel 4 has a second engaging portion 42, at least one of the first end portion 31 and the second end portion 32 is opposite to the second engaging portion 42 in the circumferential direction of the transmission wheel 2, for example, the first end portion 31 is opposite to the second engaging portion 42 in the circumferential direction of the transmission wheel 2, so that during the rotation process, the first end portion 31 can abut against the second engaging portion 42 in the circumferential direction of the transmission wheel 2 to push the wheel 4 to rotate. It will be appreciated that the central axis of the drive wheel 2 is oriented in the same direction as the central axis of the power spring 3 and the central axis of the wheel 4. The force accumulation of the force accumulation spring 3 means that when the turning wheel 4 is unable to rotate by the external force, one of the first end portion 31 and the second end portion 32 of the force accumulation spring 3 is unable to move due to the stop of the second engaging portion 2 of the turning wheel 4, and the other is rotated by the driving of the second engaging portion 23, so that the force accumulation spring 3 itself is twisted to store the torsion force.

Specifically, as shown in fig. 5 to 7, the transmission wheel 2 includes a transmission wheel body including a cylinder 241 and a bottom 242 connected to the cylinder 241, the cylinder 241 and the bottom 242 defining a receiving chamber 25 having an opening toward the wheel 4, and a first engaging portion 23 connected to the bottom 242 and extending in a direction close to the wheel 4. The rotor 4 includes a cover plate 43 and a second engaging portion 42, the cover plate 43 is opposite to the accommodating chamber 25 in the axial direction of the rotor 4, and the second engaging portion 42 is connected to the cover plate 43 and extends into the accommodating chamber 25. As shown in fig. 1, the cylindrical body 241 has a cylindrical structure, the first teeth 21 are provided on the outer wall surface of the cylindrical body 241, and the first engaging portion 23 has an arc-shaped plate structure. The cover plate 43 is a circular cover plate, and the second engaging portion 42 is connected to the outer side of the cover plate 43 and has an arc-shaped plate structure.

A part of the first engaging portion 23 and a part of the second engaging portion 42 are opposed to each other in the radial direction of the cylindrical body 241. In the embodiment shown in fig. 1, the second engaging portion 42 is located outside the first engaging portion 23. The power storage spring 3 is fitted over each of the first engaging portion 23 and the second engaging portion 42. The first end 31 of the power storage spring 3 is apart from the bottom 242 with respect to the second end 32, the first end 31 is opposed to the second engaging portion 42 in the circumferential direction of the transmission wheel 2 and abuts against one end surface of the first engaging portion 23, and the second end 32 is located between the second engaging portion 42 and the bottom 242 in the axial direction of the transmission wheel 2 and abuts against the other end surface of the first engaging portion 23 in the circumferential direction of the transmission wheel 2.

The operation of the power transmission switching apparatus 100 will be described with reference to the embodiment shown in fig. 1 to 7.

In a free state, the transmission wheel 2 drives the rotating wheel 4 to rotate through the force storage spring 3, that is, under the condition that no external force is applied to the shifting fork 7, the transmission wheel 2 can push the rotating wheel 4 to rotate by pushing the force storage spring 3. As an example, when the driving wheel 2 is driven by the driving motor 1 to rotate clockwise (as shown by the arrow in fig. 5), the power storage spring 3 is rotated by the driving wheel 2, the first end 31 of the power storage spring 3 abuts against the second engaging portion 42, and the rotating wheel 4 is rotated by pushing the second engaging portion 42, so as to rotate the transmission shaft 5, and the rack teeth 6 and the fork 7.

In the clamping state, the front axle gear is meshed, the shifting fork 7 is acted by external force, and the rotating wheel 4 is acted by the transmission shaft 5 and can not rotate. As an example, if the driving motor 1 drives the driving wheel 2 to rotate clockwise at this time, the first end 31 of the power storage spring 3 cannot move due to the action of the second engaging portion 42, the second end 32 of the power storage spring 3 moves clockwise due to the action of the first engaging portion 23, the power storage spring 3 is twisted to store the twisting force, the twisting force stored in the power storage spring 3 is greater than the external force or the external force disappears as the driving motor 1 continues to drive, the first end 31 of the power storage spring 3 can rotate the runner 4 by pushing the second engaging portion 4, and then the transmission shaft 5 is driven to rotate, the rack 6 and the shift fork 7 move, and at this time, the shift fork 7 returns to the free state.

In another embodiment, the first end 31 of the power storage spring 3 may abut against the other end surface of the first engaging portion 23, the second end 32 may abut against the other end surface of the first engaging portion 23 and face the second engaging portion 42 in the circumferential direction of the transmission wheel 2, and the second end 32 may abut against the second engaging portion 42 to urge the pulley 4 to rotate. Or, in other embodiments, the first end portion 31 and the second end portion 32 of the power storage spring 3 can respectively abut against two opposite end surfaces of the second engaging portion 42 in the circumferential direction of the transmission wheel 2, so that the first end portion 31 or the second end portion 32 respectively pushes the second engaging portion 42 to push the rotating wheel 4 to rotate in the forward and reverse circumferential directions, which is not limited by the present invention.

In some embodiments, as shown in fig. 6, the transmission wheel 2 has a hollow column 22 extending along the axial direction thereof, the rotating wheel 4 is provided with a through hole 41, and the transmission shaft 5 sequentially includes a rotating shaft portion 51, a limiting portion 52 and a meshing portion 53 connected in the axial direction thereof. Wherein, the rotating shaft part 51 is rotatably fitted in the hollow column 22, that is, the rotating shaft part 51 can rotate relative to the hollow column 22, the limiting part 52 is fitted in the through hole 41 so that the rotating wheel 4 and the transmission shaft 5 are limited in the positive and negative circumferential directions, that is, the outer circumferential profile of the limiting part 52 is matched with the profile of the through hole 41, so that the rotating wheel 4 and the transmission shaft 5 are limited in the positive circumferential direction and the negative circumferential direction around the axial direction, so that the rotating wheel 4 can drive the rotating shaft 5 to rotate, and the rotating wheel 5 can limit the rotating of the rotating wheel 4 when being clamped.

The engaging portion 53 engages with the rack teeth 6. As shown in fig. 3 and 4, the outer peripheral surface of the engaging portion 53 is provided with a plurality of second tooth portions 531 extending along the axial direction of the transmission shaft 5, the rack teeth 6 are provided with a plurality of third tooth portions 61 arranged in parallel along the first direction, and the second tooth portions 531 of the engaging portion 53 are engaged with the third tooth portions 61 of the rack teeth 6, so that the rotation of the engaging portion 53 drives the rack teeth 6 to move along the first direction. It will be appreciated that the manner of rotation of the engagement portion 53 determines the direction of movement of the rack 6.

Alternatively, the through-hole 41 is a polygonal hole, and the stopper portion 52 matches the shape of the through-hole. As an example, as shown in fig. 1, the through hole 41 is a square hole, the cross section of the stopper portion 52 in the direction perpendicular to the axial direction thereof is a square, and the stopper portion 52 is caught in the through hole 41 so that the rotary wheel 4 and the drive shaft 5 are stopped from each other in the forward and reverse circumferential directions.

In other alternative embodiments, the through hole 41 may be a polygonal hole such as a triangular hole, a hexagonal hole, etc., and the present invention is not limited thereto.

In some embodiments, as shown in fig. 1, the power transmission switching device 100 includes a housing, a drive motor 1, a drive pulley 2, a power storage spring 3, a wheel 4, and a portion of a drive shaft 5 are located within the housing, a rack 6 and a fork 7 are located outside the housing, and another portion of the drive shaft 5 extends from the housing to engage the rack 6.

Specifically, as shown in fig. 1, the housing includes a housing 81 and a housing cover 82 connected to the housing 81, and the motor 1, the transmission wheel 2, the power storage spring 3, and the wheel 4 are all located in a space defined by the housing 81 and the housing cover 82. The housing cover 82 is provided with an opening, and the engaging portion 53 of the drive shaft 5 extends from the opening of the housing cover 82 to engage with the rack 6.

Further, in order to avoid displacement due to shaking when the driving motor 1 is operated, the power transmission switching device 100 further includes a motor pressing plate 9, and the motor pressing plate 9 covers the motor 13 and is connected to an inner wall surface of the housing 81 to clamp the motor 13 between the motor pressing plate 9 and the housing 81.

Another aspect of the present invention provides a vehicle having the power transmission switching apparatus 100 in any one of the above embodiments. In some embodiments, the vehicle is an all-terrain vehicle, the all-terrain vehicle has two-drive and four-drive driving states, power switching can be performed through the power transmission switching device 100, the power switching can be controlled through an all-electronic control unit, the power switching device can also be controlled through a switch directly, and the all-terrain vehicle is flexible in application and high in reliability.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations to the above embodiments by those of ordinary skill in the art are intended to be within the scope of the present invention.

Claims (10)

1. A power transmission switching apparatus characterized by comprising: the power storage device comprises a driving motor, a driving wheel, a power storage spring, a rotating wheel, a transmission shaft, a rack and a shifting fork, wherein the driving motor is used for driving the driving wheel to rotate;

in the free state, the transmission wheel drives the rotating wheel to rotate through the force storage spring, so that the transmission shaft drives the rack teeth to move back and forth along the first direction, in the clamping state, the shifting fork is acted by external force, the transmission wheel twists the force storage spring to enable the force storage spring to store torque force to overcome the external force, and therefore the rotating wheel is driven to rotate, and the shifting fork is switched to the free state.

2. The power transmission switching apparatus according to claim 1, wherein an outer peripheral surface of the output shaft of the drive motor is provided with a plurality of rotary teeth, and an outer peripheral surface of the transmission wheel is provided with a plurality of teeth portions, the rotary teeth being engaged with the teeth portions so that rotation of the output shaft rotates the transmission wheel.

3. The power transmission switching apparatus according to claim 2, wherein the drive motor includes a motor, a drive pulley, and a driven pulley, the motor driving the drive pulley to rotate, the drive pulley engaging with the driven pulley, the driven pulley being connected to the output shaft.

4. The power transmission switching apparatus according to claim 1, wherein the transmission wheel has a first engaging portion, the power storage spring has a first end portion and a second end portion, and the first end portion and the second end portion respectively abut against two sides of the first engaging portion that are opposite in the circumferential direction of the transmission wheel;

the runner has a second engaging portion, and at least one of the first end portion and the second end portion is opposed to the second engaging portion in the circumferential direction.

5. The power transmission switching apparatus according to claim 4,

the driving wheel comprises a driving wheel body, the driving wheel body comprises a barrel body and a bottom connected with the barrel body, an accommodating cavity with an opening facing the rotating wheel is defined by the barrel body and the bottom, and the first clamping part is connected with the bottom and extends towards the direction close to the rotating wheel;

the rotating wheel comprises a cover plate, the cover plate is opposite to the accommodating cavity in the axial direction of the rotating wheel, and the second clamping part is connected with the cover plate and extends towards the accommodating cavity.

6. The power transmission switching device according to claim 5, wherein the first engaging portion and the second engaging portion are opposed in a radial direction of the cylinder, and the power storage spring is fitted over each of the first engaging portion and the second engaging portion.

7. The power transmission switching device according to claim 6, wherein the first end portion of the power storage spring is located away from the bottom portion with respect to the second end portion, the first end portion is opposite to the second engagement portion in the circumferential direction, and the second end portion is located between the second engagement portion and the bottom portion in the axial direction.

8. The power transmission switching apparatus according to any one of claims 1 to 7, wherein the transmission wheel has a hollow cylinder, the rotary wheel has a through hole, the transmission shaft includes a rotary shaft portion rotatably fitted in the hollow cylinder, a stopper portion fitted in the through hole so that the rotary wheel and the transmission shaft are stopped from each other in forward and reverse circumferential directions, and a meshing portion meshed with the rack gear.

9. The power transmission switching apparatus according to any one of claims 1 to 7, comprising a housing, wherein the drive motor, the transmission wheel, the power storage spring, the rotary wheel and a portion of the transmission shaft are located within the housing, and another portion of the transmission shaft protrudes from the housing to engage with the rack teeth.

10. A vehicle characterized by comprising the power transmission switching apparatus according to any one of claims 1 to 9.

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