CN116406570A

CN116406570A - Automatic unlocking driving device

Info

Publication number: CN116406570A
Application number: CN202111647174.3A
Authority: CN
Inventors: 曹跃逊; 高乃新; 王涛
Original assignee: Globe Jiangsu Co Ltd
Current assignee: Globe Jiangsu Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2023-07-11
Also published as: CN116406571A

Abstract

The invention provides an automatic unlocking driving device, which aims to solve the problem that the existing equipment cannot automatically enter an unlocking state after a power assembly is closed or when the input torque of a transmission shaft is smaller than the resistance torque of a travelling wheel. The automatic unlocking driving device includes: a locking member and an elastic member. The locking piece is arranged on a transmission shaft driven by the power assembly and provided with a first position, a second position and a third position; the first position and the second position are locking positions for connecting the travelling wheels with the transmission shaft, and the third position is unlocking position for separating the travelling wheels from the transmission shaft; the elastic piece accumulates elastic potential energy when the locking piece moves from the third position to the first position or the second position, and releases the elastic potential energy to enable the locking piece to return from the first position or the second position to the third position when the driving device is closed or the input torque is smaller than the resistance torque of the travelling wheel.

Description

Automatic unlocking driving device

Technical Field

The invention relates to the field of self-propelled equipment driving, in particular to an automatic unlocking driving device.

Background

The hand-push type self-propelled mower is mowing equipment with a self-propelled function, and the driving device drives the travelling wheels to rotate, so that the hand-push type self-propelled mower automatically walks on the ground, has the advantages of labor saving, high efficiency, simplicity and convenience in operation and the like, and is very suitable for trimming lawns such as greens and shadow lands in sanitation grasslands.

The drive device of the traditional self-propelled mower is connected with the travelling wheels through the drive device, the structure of the existing drive device cannot realize automatic unlocking between the travelling wheels and the drive device after the drive device is closed, if the drive device is closed, the travelling wheels can drive the drive device to rotate together, and a user needs to use larger force to pull the device backwards. There is a need to provide an automatic unlocking drive device that automatically enters an unlocked state to allow the road wheels to freely rotate relative to the drive shaft after the power assembly is turned off or when the input torque of the drive shaft is less than the resistance torque of the road wheels.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present invention provides an automatic unlocking driving device, so as to solve the problem that the existing driving device, self-propelled equipment and mower cannot automatically enter an unlocking state after a power assembly is turned off or when an input torque of a transmission shaft is smaller than a resistance torque of a traveling wheel.

To achieve the above and other related objects, the present invention provides an automatic unlocking driving apparatus for driving a traveling wheel to walk, comprising: a locking member and an elastic member. The locking piece is arranged on a transmission shaft driven by the power assembly and provided with a first position, a second position and a third position; the first position and the second position are locking positions for connecting the travelling wheels with the transmission shaft, and the third position is unlocking position for separating the travelling wheels from the transmission shaft; the elastic piece accumulates elastic potential energy when the locking piece moves from the third position to the first position or the second position, and releases the elastic potential energy to enable the locking piece to return from the first position or the second position to the third position when the driving device is closed or the input torque is smaller than the resistance torque of the travelling wheel.

In an example of the present invention, the driving member is detachably mounted on the driving shaft, and a steering buffer structure for buffering the driving member from the driving shaft when the driving member is steered is provided between the driving shaft and the driving member.

In an example of the present invention, a through hole is provided on the driving member, the transmission shaft is inserted into the through hole, the steering buffer structure includes at least one avoidance structure provided on the transmission shaft, a boss corresponding to the avoidance structure and provided in the through hole, and a circumferential gap provided between the avoidance structure and the corresponding boss for buffering; the avoidance structure drives the driving piece to rotate when rotating to the corresponding protruding part.

In an example of the present invention, the avoidance structure is a flat surface disposed on the transmission shaft, and a mating surface is disposed on a side of the protrusion facing the flat surface when the transmission shaft rotates.

In an example of the present invention, a driving member is disposed on the transmission shaft, and the elastic member includes a first restoring elastic body; the first reset elastomer is arranged between the locking piece and the driving piece and accumulates circumferential reset energy when the locking piece rotates relative to the driving piece.

In one example of the present invention, the first return elastic body includes a torsion spring having one end mounted on the driving member and the other end mounted on the locking member.

In an example of the present invention, the automatic unlocking driving device further includes a power output member, the power output member is mounted on a transmission shaft on a side of the locking member facing the travelling wheel, and is rotatable relative to the transmission shaft, a clutch plug-in structure is disposed between the output member and the locking member, and a driving structure is disposed between the output member and the travelling wheel.

In one example of the invention, the elastic member includes a second return elastic body; the second reset elastic body is arranged between the travelling wheel and the locking piece and accumulates axial reset energy when the locking piece moves to the travelling wheel side.

In one example of the present invention, the second return elastic body includes a spring, one end of which abuts against the lock member, and the other end of which abuts against the power output member.

In one example of the invention, a driving member is arranged on the transmission shaft, a rolling body is arranged on the driving member, a chute is arranged on the locking member, and the transmission shaft drives the locking member to switch among a first position, a second position and a third position through rolling of the rolling body in the chute in the rotating process.

In one example of the invention, the sliding chute comprises a first spiral groove and a second spiral groove with opposite rotation directions, one ends of the first spiral groove and the second spiral groove are intersected, and the other ends extend to one side away from the travelling wheel respectively; when the rolling bodies reach the intersection point of the first spiral groove and the second spiral groove, the locking piece is positioned at a third position; when the rolling body reaches one end of the first spiral groove, which is away from the intersection point, the locking piece is positioned at a first position; when the rolling bodies reach one end of the second spiral groove, which is away from the intersection point, the locking piece is in the second position.

In one example of the invention, two sliding grooves are uniformly distributed on the inner wall of the locking piece along the circumference, and the number of the rolling bodies corresponds to that of the sliding grooves and is uniformly distributed on the driving piece along the circumference.

In one example of the invention, the driving member is arranged separately from the transmission shaft, and the driving member is sleeved on the transmission shaft and rotates along with the transmission shaft.

In one example of the invention, the drive member is integrally formed with the drive shaft.

In one example of the invention, the rolling bodies are balls; the driving piece is provided with a groove matched with the ball, a part of the ball is accommodated in the groove, and the part exposed out of the groove rolls along the chute.

In an example of the present invention, the clutch engagement structure includes a plurality of first engagement teeth disposed on the locking member and a plurality of second engagement teeth disposed on the power take-off member, the plurality of first engagement teeth engaging the plurality of second engagement teeth when the locking member is in the locked position.

In one example of the invention, the drive structure includes a gear assembly.

In an example of the present invention, the locking member is provided with a first inserting tooth, and the first inserting tooth drives a second inserting tooth arranged on the travelling wheel so as to rotate the travelling wheel.

The automatic unlocking driving device can drive the travelling wheels by the transmission shaft when the locking piece is in the first position and the second position, and can automatically reset the locking piece to the third position for unlocking the transmission shaft and the travelling wheels when the driving device is closed or the input torque of the elastic piece is smaller than the resistance torque of the travelling wheels, so that various driving connection requirements of users can be met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without giving inventive effort to those skilled in the art.

FIG. 1 is a diagram of the installation of an automatic unlocking drive on a drive shaft according to the present invention;

FIG. 2 is an exploded view of the automatic unlocking drive of the present invention on a drive shaft;

FIG. 3 is an exploded view of the automatic unlocking drive of the present invention at another angle on the drive shaft;

FIG. 4 is a three-dimensional schematic view of the automatic unlocking driving apparatus of the present invention when the drive shaft starts to rotate;

FIG. 5 is a three-dimensional schematic view of the locking member of the automatic unlocking driving apparatus of the present invention when the locking member is driven by the driving member to the locking position;

FIG. 6 is a force-bearing schematic diagram of the locking member after the transmission shaft stops rotating in the automatic unlocking driving device of the present invention;

FIG. 7 is a three-dimensional schematic view of the automatic unlocking driving device of the present invention in which the locking member is reset to the unlocking position by the elastic member;

FIG. 8 is a schematic view of the structure of the automatic unlocking driving device of the present invention when there is a circumferential gap between the transmission shaft and the driving member in the initial state;

FIG. 9 is a schematic view of the structure of the driving shaft and the driving member after the flat surface of the driving shaft contacts the mating surface of the driving member in the automatic unlocking driving device;

FIG. 10 is a schematic view of the structure of the automatic unlocking driving device according to the present invention, in which the driving member rotates along with the driving shaft, and the locking member is driven to the locking position;

FIG. 11 is a schematic view of the rotation angle of the transmission shaft relative to the driving member and the rotation angle between the unlocking position and the locking position of the locking member in the automatic unlocking driving device according to the present invention;

FIG. 12 is a three-dimensional cross-sectional view of a locking member of the automatic unlocking driving apparatus of the present invention;

FIG. 13 is a front cross-sectional view of the locking member of the automatic unlocking driving apparatus of the present invention;

FIG. 14 is a schematic view of the positions of the balls of the automatic unlocking driving apparatus according to the present invention when the locking member is in the first, second and third positions;

FIG. 15 is a schematic view of the mounting relationship of the road wheels to the automatic unlocking drive;

FIG. 16 is a schematic view of the mounting relationship of the road wheels with the automatic unlocking drive after removal of the wheel cover;

FIG. 17 is a view showing the installation of a drive shaft on a drive device;

FIG. 18 is an exploded view of the drive assembly of the present invention;

fig. 19 is a schematic view of gear engagement of the driving device in the present invention.

Description of element numbers:

100. a walking wheel; 200. a walking wheel cover; 300. a driven gear; 400. a driving device; 410. a transmission shaft; 411. a circumference; 412. a flat surface; 420. a gearbox; 421. a duplex gear; 422. a large gear; 430. a motor assembly; 431. a motor housing; 432. a self-propelled motor; 433. motor teeth; 500. automatically unlocking the driving device; 510. a driving member; 511. a second through hole; 512. a groove; 513. a rolling element; 514. a spring mounting section; 515. a first torsion spring slot; 516. a torsion spring mounting section; 517. an end face; 518. a boss; 519. a mating surface; 520. a first return elastomer; 521. a first end; 522. a second end; 530. a locking member; 531. a chute; 5311. a first helical groove; 5312. a second helical groove; 532. the first plug-in teeth; 533. a spring mounting groove on the locking member; 534. a first through hole; 535. a second torsion spring slot; 540. a second return elastomer; 550. a power take-off; 551. an inner end surface; 552. the second plug-in teeth; 553. a spring mounting groove on the power take-off; 554. a drive gear; 560. a gasket; 570. and a retainer ring for the shaft.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention. The test methods in the following examples, in which specific conditions are not specified, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

It should be understood that the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used in this specification for descriptive purposes only and not for purposes of limitation, and that the invention may be practiced without materially departing from the novel teachings and without departing from the scope of the invention.

Referring to fig. 1 to 19, the present invention provides an automatic unlocking driving device 500, which can solve the problem that the existing driving device, self-propelled equipment or mower cannot automatically enter an unlocking state after the power assembly is turned off or when the input torque of the driving shaft 410 is smaller than the resistance torque of the travelling wheels.

Referring to fig. 2 to 4, the automatic unlocking driving apparatus 500 includes: a locking member 530 and an elastic member. The locking member 530 is mounted on the drive shaft 410 driven by the power assembly and has a first position, a second position, and a third position; the driving device 400 drives the driving shaft 410 to rotate, and the driving shaft 410 drives the locking piece 530 to switch among the first position, the second position and the third position through the driving piece 510; the first position is a locking position where the locking member 530 is in driving connection with the road wheel when the transmission shaft 410 rotates forward, and when the locking member 530 is in the first position, the driving device 400 rotates forward and drives the road wheel to rotate forward; the second position is a locking position where the locking member 530 is in driving connection with the road wheel when the transmission shaft 410 rotates reversely, and when the locking member 530 is in the second position, the driving device 400 rotates reversely and drives the road wheel to rotate reversely; the third position is an unlocked position that disconnects the connection between the drive shaft 410 and the road wheel, which is free to rotate relative to the drive shaft 410 when the locking member 530 is in the third position. The locking member 530 may be switched between the third position and the first position when the drive shaft 410 rotates in the forward direction, or between the third position and the second position when the drive shaft 410 rotates in the reverse direction. The automatic unlocking driving device 500 can enable the locking piece 530 to automatically switch positions through the bidirectional rotation of the driving device 400 so as to realize bidirectional driving of the travelling wheels. The elastic member accumulates elastic potential energy when the locking member 530 moves from the third position to the first position or the second position, and releases the elastic potential energy to return the locking member 530 from the first position or the second position to the third position when the driving device 400 is turned off or the input torque is smaller than the resistance torque of the road wheel. The automatic unlocking driving device 500 can automatically unlock the traveling wheels from the transmission shaft 410 when the driving device 400 is turned off or the input torque is smaller than the resistance torque of the traveling wheels, no matter in the forward transmission or the reverse transmission. The automatic unlocking driving device 500 not only can realize bidirectional driving of the travelling wheels through bidirectional rotation of the driving device 400, but also can automatically unlock the travelling wheels and the transmission shaft 410 when the driving device 400 is closed or the input torque is smaller than the resistance torque of the travelling wheels.

Referring to fig. 2 to 4, in an example of the present invention, a driving member 510 is disposed on the driving shaft 410, and the driving member 510 drives the locking member 530 to move from the third position to the first position or the second position when the driving shaft 410 rotates, so as to correspondingly implement a forward rotation or a reverse rotation driving connection between the driving shaft 410 and the travelling wheel. In an embodiment of the present invention, the driving member 510 and the driving shaft 410 are separately arranged, a second through hole 511 matched with the driving shaft 410 is provided on the driving member 510, the driving shaft 410 is inserted into the second through hole 511 and extends out of the driving member 510, and the driving member 510 is sleeved on the driving shaft 410 and rotates along with the driving shaft 410. The driving member 510 is provided with a rolling body 513, the locking member 530 is provided with a sliding groove 531, and the transmission shaft 410 drives the locking member 530 to switch among the first position, the second position and the third position by rolling of the rolling body 513 in the sliding groove 531 during rotation.

Referring to fig. 8 to 14, in an example of the present invention, the sliding groove 531 includes a first spiral groove 5311 and a second spiral groove 5312 with opposite rotation directions, one ends of the first spiral groove 5311 and the second spiral groove 5312 are intersected, the other ends of the first spiral groove 5311 and the second spiral groove 5312 extend to a side away from the travelling wheel, the first spiral groove 5311 and the second spiral groove 5312 are symmetrically arranged in a shape similar to a herringbone, and rotation angles are ± x°, the transmission shaft 410 drives the driving member 510 and the rolling body 513 to rotate, and the rotation angle of the locking member 530 relative to the driving member 510 is positive rotation X ° and reverse rotation x°, which should be noted that specific values of X can be set according to design requirements. The axial extension distances of the first spiral groove 5311 and the second spiral groove 5312 are the same and the maximum value is M, so as to realize that the locking piece 530 is locked with the travelling wheel at the same axial position, and it should be noted that the specific value of M can be set according to design requirements. Wherein, when rolling element 513 reaches the intersection of first helical groove 5311 and second helical groove 5312, lock 530 is in the third position; when the rolling element 513 reaches an end of the first helical groove 5311 facing away from the intersection, the locking member 530 is in the first position; when the rolling bodies 513 reach the end of the second helical groove 5312 facing away from the intersection point, the locking member 530 is in the second position.

Considering that one sliding groove 531 can realize driving of the rolling bodies 513 to the locking piece 530, the number of sliding grooves 531 in the present invention may be at least one, but in consideration of uniformity of stress, preferably, in one example of the present invention, the number of sliding grooves 531 is two, and are uniformly distributed on the inner wall of the locking piece 530 along the circumference 411, the number of rolling bodies 513 is correspondingly matched with the sliding grooves 531, and are uniformly distributed on the driving piece 510 along the circumference 411 at positions corresponding to the sliding grooves 531. In the present invention, the rolling element 513 may be of other revolution structures, as long as it matches the rotation direction of the spiral groove, and rolls in the spiral groove to drive the locking element 530 to move, preferably referring to fig. 2 to 7, in an example of the present invention, the rolling element 513 is a ball, such as a steel ball, a groove 512 matching with the ball is provided on the driving element 510, the groove 512 is a spherical groove, the radius of the spherical surface matches with the radius of the ball, a part of the ball is accommodated in the groove 512, another part of the ball is exposed out of the groove 512, the ball rolls in the groove 512, and a part of the exposed groove 512 drives the sliding groove 531 on the locking element 530 to move.

In the invention, the locking piece 530 can be directly matched with the travelling wheel to realize driving, for example, in one example of the invention, the travelling wheel is rotatably arranged on the vehicle body, and a clutch plug-in structure is directly arranged between the locking piece 530 and the travelling wheel; the clutch engagement structure includes a plurality of first engagement teeth 532 disposed on the locking member 530 and a plurality of second engagement teeth 552 disposed on the road wheel, the locking member 530 being configured to be shifted between an unlocked position and a locked position by the driving member 510, the plurality of first engagement teeth 532 and the plurality of second engagement teeth 552 engaging with each other when the locking member 530 is in the locked position to drive the road wheel to rotate, and the plurality of first engagement teeth 532 and the plurality of second engagement teeth 552 disengaging when the locking member 530 is in the unlocked position.

Although the driving can be achieved by the locking member 530 directly cooperating with the road wheel, preferably, referring to fig. 2 to 4, in an example of the present invention, the automatic unlocking driving apparatus 500 further includes a power output member 550, wherein the power output member 550 is mounted on the transmission shaft 410 on the side of the locking member 530 facing the road wheel and is rotatable relative to the transmission shaft 410, and one side of the power output member 550 is abutted against the end surface 517 on the driving member 510 to cooperate, and the other side is axially fixed by a spacer 560 and a shaft retainer 570. A clutch plug structure is arranged between the output member and the locking member 530, and a driving structure is arranged between the output member and the travelling wheel. The clutch engagement structure includes a plurality of first engagement teeth 532 disposed on the locking member 530 and a plurality of second engagement teeth 552 disposed on the power take-off member 550, and the plurality of first engagement teeth 532 and the plurality of second engagement teeth 552 engage with each other when the locking member 530 is in the locked position to drive the road wheel to rotate. When the locking member 530 is in the unlocked position, the first plurality of mating teeth 532 and the second plurality of mating teeth 552 are separated.

The driving structure of the present invention may be any suitable form for driving the traveling wheel to rotate by rotating the power output member 550, such as a plurality of gear sets, a belt transmission, a chain transmission, etc., but considering the transmission efficiency, referring to fig. 2, 3, 15 and 16, in an example of the present invention, the driving structure includes a gear assembly including a driving gear 554 disposed on the power output member 550 and a driven gear 300 disposed on the traveling wheel, the driving gear 554 and the driven gear 300 being engaged to drive the traveling wheel to rotate, and a traveling wheel cover 200 disposed outside the driven gear 300 for including the driving gear 554 and the driven gear 300. When the power input of the transmission shaft 410 is released or the input torque of the transmission shaft 410 is smaller than the resistance torque of the traveling wheels, the separation of the first and

second socket teeth

532 and 552 is achieved under the action of the elastic member.

Referring to fig. 2 to 3, in an example of the present invention, the locking member 530 drives the traveling wheel through the power output member 550, the driving member 510 is disposed on the driving shaft 410, and the elastic member includes a first reset elastic body 520 and a second reset elastic body 540; the first reset elastomer 520 is installed between the locking member 530 and the driving member 510, and accumulates circumferential reset energy when the locking member 530 rotates relative to the driving member 510; the first reset elastomer 520 comprises a torsion spring, one side of the driving member 510 facing the locking member 530 is provided with a cylindrical torsion spring mounting section 516 and a first torsion spring slot 515, the outer diameter of the torsion spring mounting section 516 is matched with the inner diameter of the torsion spring, the locking member 530 is provided with a first through hole 534, the first through hole 534 is sleeved outside the driving member 510, the torsion spring and the transmission shaft 410 and can rotate relative to the driving member 510, the torsion spring and the transmission shaft 410, the inner side end surface 551 of the first through hole 534 is provided with a second torsion spring slot 535, the torsion spring is sleeved on the torsion spring mounting section 516, the first end 521 is inserted in the first torsion spring slot 515, and the second end 522 is inserted in the second torsion spring slot 535. The second return elastic body 540 is installed between the power take-off 550 and the lock 530, and accumulates an axial return force when the lock 530 moves toward the power take-off 550 side. The second restoring elastic body 540 may be any suitable structural form that pushes the locking piece 530 to move axially when recovering elastic deformation, such as a bent reed, a spring pad with a certain elasticity, etc., in this embodiment, the second restoring elastic body 540 is a spring, the power output piece 550 and the locking piece 530 are respectively provided with a spring mounting groove, one end of the spring abuts against the spring mounting groove 553 on the power output piece, and the other end of the spring abuts against the spring mounting groove 533 on the locking piece. The transmission shaft 410 is provided with a corresponding spring mounting section 514, the outer diameter of the spring mounting section 514 is smaller than the inner diameter of the spring, and the spring is sleeved on the spring mounting section 514.

In another example of the present invention, the locking member 530 is directly engaged with the road wheel to achieve driving, and the second reset elastic body 540 is installed between the road wheel and the locking member 530, and accumulates axial reset energy when the locking member 530 moves to the road wheel side. The second restoring elastic body 540 can push the locking member 530 to move along the axial direction when restoring the elastic deformation, for example, a bent reed, a spring pad with a certain elasticity, etc., in this embodiment, the second restoring elastic body 540 is a spring, the travelling wheel and the locking member 530 are respectively provided with a spring mounting groove, one end of the spring is abutted against the spring mounting groove on the travelling wheel, and the other end of the spring is abutted against the spring mounting groove 533 on the locking member.

Referring to fig. 8 to 11 and fig. 2 to 3, considering that the rotation speeds of the inner and outer wheels are not synchronous when the traveling wheels are manually operated to steer, the steering resistance is high, and in order to achieve portability of steering, in an example of the present invention, the driving member 510 is detachably mounted on the driving shaft 410, and a steering speed adjusting structure is provided between the driving shaft 410 and the driving member 510. In an example of the present invention, the driving member 510 is provided with a second through hole 511, the transmission shaft 410 is inserted into the second through hole 511, and the steering speed adjusting structure includes at least one avoidance structure provided on the transmission shaft 410, a boss 518 corresponding to the avoidance structure and provided in the second through hole 511, and a circumferential gap provided between the avoidance structure and the corresponding boss 518; when the steering device is used for steering the traveling wheel, the traveling wheel rotates relative to the transmission shaft 410, so that the protruding part 518 is temporarily separated from the transmission shaft 410, and in the process that the protruding part 518 is temporarily separated from the transmission shaft 410, the transmission shaft 410 cannot drive the traveling wheel to rotate, and the driving part 510 can be driven to rotate until the avoiding structure rotates to the corresponding protruding part 518, so that the speed reduction of the traveling wheel during turning is realized. The relief structure may be any suitable structure that forms a gap between the drive shaft 410 and the boss 518, such as a groove 512, etc., and preferably, in an example of the present invention, the relief structure is a flat surface 412 disposed on the circumference 411 of the drive shaft 410, and a mating surface 519 is disposed on a side of the boss 518 that faces the flat surface 412 when the drive shaft 410 rotates. A circumferential gap is provided between the flat surface 412 and the mating surface 519, and when the flat surface 412 rotates past the circumferential gap to the mating surface 519, the drive device 400 is normally driven to rotate.

Referring to fig. 8 to 11, in an example of the present invention, the driving device 400 can drive the transmission shaft 410 to rotate forward and reversely, the protruding portion 518 is provided with mating surfaces 519 on both sides along the circumferential direction 411, and the flat surface 412 mates with the mating surfaces 519 on both sides of the protruding portion 518 during the forward rotation or the reverse rotation of the transmission shaft 410, so as to drive the driving device 400 to rotate forward or reversely.

Referring to fig. 11, considering the balance of the forces, preferably, in an example of the present invention, there are two (or more) avoidance structures, and the avoidance structures are uniformly distributed along the circumference 411 of the transmission shaft 410, the number of the protrusions 518 is the same as that of the avoidance structures, and the protrusions are uniformly distributed on the inner wall of the through hole along the circumference 411, so as to form an approximately 8-shaped shaft hole, the maximum avoidance gap between the protrusions and the avoidance structures on two sides is Y degrees, and the specific value of the avoidance gap Y can be set in the design and manufacturing process according to the diameter of the travelling wheel, the turning speed, and the like.

Referring to fig. 2 to 7 and fig. 15 to 19, the automatic unlocking driving device 500 of the present invention has the following working principles: when the self-propelled motor 432 is started, torque is transmitted to the transmission shaft 410 through the motor teeth 433, the duplex gear 421 and the large gear 422, when the transmission shaft 410 rotates with the driving member 510 and the balls, the balls drive the herringbone spiral grooves of the locking member 530 to generate forces, and when the generated forces T2 and F1 are respectively larger than the torsion force of the torsion spring and the elastic force of the spring, the locking member 530 rotates around the axis Z and moves along the axis Z, and when the distance between the locking member 530 and the power output member 550 is moved from N1 to N2, the first inserting teeth 532 of the locking member 530 and the second inserting teeth 552 of the power output member 550 are meshed, and the transmission shaft 410 drives the power output member 550 to synchronously rotate, so that the self-propelled function of the device is realized. When the torque and axial force input by closing the self-propelled motor 432 or the transmission shaft 410 are smaller than the force of the torsion spring and the spring restoring deformation, the inverted V-shaped groove 512 of the locking member 530 presses the balls in reverse under the action of the torsion force of the torsion spring and the elastic force of the spring, the locking member 530 generates opposite movement when the self-propelled motor 432 is driven, namely, the locking member 530 rotates around the axis Z in the opposite direction and moves along the axis Z in the opposite direction, the distance between the locking member 530 and the power output member 550 is moved from N2 to N1, the first inserting teeth 532 of the locking member 530 and the second inserting teeth 552 of the power output member 550 are separated, the power output member 550 is separated from the transmission shaft 410, and the traveling wheel 100 can rotate freely relative to the driving device 400.

In the present invention, if there is no elastic member, the locking member can be switched between the first position and the second position by the bidirectional rotation of the driving device. Thus, although the unlocking between the transmission shaft and the travelling wheel can be realized through the bidirectional driving of the same power assembly on the travelling wheel, the automatic unlocking can not be realized through the elastic piece under the condition of no external force input. At this time, in comparison with the above embodiments, the driving device includes the driving shaft 410 and the locking member 530, but does not include the elastic member (i.e., does not include the first reset elastic body 520 and the second reset elastic body 540). The transmission shaft 410 is connected with the driving device 400; the locking member 530 is mounted on the drive shaft 410 and has a first position, a second position, and a third position; wherein the driving means 400 drives the locking member to switch between the first position, the second position and the third position; when the locking member 530 is in the first position, the driving device 400 drives the travelling wheel to rotate in the forward direction; when the locking member 530 is in the second position, the driving device 400 drives the travelling wheel to rotate reversely; with the locking member 530 in the third position, the road wheel is free to rotate relative to the drive shaft 410. The driving structure not only can realize forward and reverse bidirectional driving, but also can enable the travelling wheel to rotate freely relative to the driving device 400 when the moving part is in the third position, and can also meet the requirement that a user unlocks and breaks away from the travelling wheel and the power shaft of the driving device.

The automatic unlocking driving device can drive the travelling wheels by the transmission shaft when the locking piece is in the first position and the second position, and can automatically reset the locking piece to the third position for unlocking the transmission shaft and the travelling wheels when the driving device is closed or the input torque of the elastic piece is smaller than the resistance torque of the travelling wheels, so that various driving connection requirements of users can be met. According to the self-propelled device and the mower, when the driving device is closed or the input torque is smaller than the resistance torque of the travelling wheels, the locking piece can be automatically reset to the third position for unlocking the transmission shaft and the travelling wheels, so that the problem that the travelling wheels and the transmission shaft cannot rotate relatively after the power assembly is closed or the input torque of the transmission shaft is smaller than the resistance torque of the travelling wheels in the conventional self-propelled device and the mower can be effectively solved. Therefore, the invention effectively overcomes a plurality of practical problems in the prior art, thereby having high utilization value and use significance.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. An automatic unlocking driving device for driving a traveling wheel to walk, comprising:

a locking member mounted on a drive shaft driven by the power assembly and having a first position, a second position and a third position; the first position and the second position are locking positions for connecting the travelling wheel with the transmission shaft, and the third position is unlocking position for separating the travelling wheel from the transmission shaft;

and the elastic member accumulates elastic potential energy when the locking member moves from the third position to the first position or the second position, and releases the elastic potential energy to enable the locking member to return from the first position or the second position to the third position when the driving assembly is closed or the input torque is smaller than the resistance torque of the travelling wheel.

2. The automatic unlocking driving device according to claim 1, wherein the driving member is detachably mounted on the driving shaft, and a steering buffer structure for buffering the driving member's acting force by the driving shaft when steering is provided between the driving shaft and the driving member.

3. The automatic unlocking driving device according to claim 1, wherein a through hole is formed in the driving member, the transmission shaft is inserted into the through hole, the steering buffer structure comprises at least one avoidance structure arranged on the transmission shaft, a bulge corresponding to the avoidance structure and arranged in the through hole, and a circumferential gap for buffering is arranged between the avoidance structure and the corresponding bulge; the avoidance structure drives the driving piece to rotate when rotating to the corresponding protruding part.

4. The automatic unlocking driving device according to claim 1, wherein the avoidance structure is a flat surface arranged on the transmission shaft, and a mating surface is arranged on one side of the protruding portion, which is abutted against the flat surface when the transmission shaft rotates.

5. The automatic unlocking driving device according to claim 1, wherein a driving member is provided on the transmission shaft, and the elastic member includes a first reset elastic body; the first reset elastomer is arranged between the locking piece and the driving piece and accumulates circumferential reset energy when the locking piece rotates relative to the driving piece.

6. The automatic unlocking driving apparatus according to claim 5, wherein the first restoring elastic body includes a torsion spring, one end of which is mounted on the driving member, and the other end of which is mounted on the locking member.

7. The automatic unlocking driving device according to claim 1, further comprising a power output member mounted on the transmission shaft on a side of the locking member facing the traveling wheel and rotatable relative to the transmission shaft, a clutch plug-in structure being provided between the output member and the locking member, and a driving structure being provided between the output member and the traveling wheel.

8. The automatic unlocking driving apparatus according to claim 7, wherein the elastic member includes a second return elastic body; the second reset elastic body is arranged between the travelling wheel and the locking piece, and accumulates axial reset energy when the locking piece moves to the travelling wheel side.

9. The automatic unlocking driving apparatus according to claim 8, wherein the second return elastic body includes a spring, one end of which abuts on the lock member, and the other end of which abuts on the power output member.

10. The automatic unlocking driving device according to claim 1, wherein a driving member is provided on the transmission shaft, a rolling body is provided on the driving member, a chute is provided on the locking member, and the transmission shaft drives the locking member to switch among the first position, the second position and the third position by rolling of the rolling body in the chute during rotation.

11. The automatic unlocking driving device according to claim 10, wherein the sliding groove comprises a first spiral groove and a second spiral groove which are opposite in rotation direction, one ends of the first spiral groove and the second spiral groove are intersected, and the other ends of the first spiral groove and the second spiral groove extend to one side away from the travelling wheel respectively; when the rolling bodies reach the intersection point of the first spiral groove and the second spiral groove, the locking piece is positioned at the third position; when the rolling bodies reach one end of the first spiral groove, which is away from the intersection point, the locking piece is positioned at the first position; when the rolling bodies reach one end of the second spiral groove, which is away from the intersection point, the locking piece is positioned at the second position.

12. The automatic unlocking driving device according to claim 10, wherein the number of the sliding grooves is even, the sliding grooves are uniformly distributed on the inner wall of the locking piece along the circumference, and the number of the rolling bodies corresponds to the number of the sliding grooves and is uniformly distributed on the driving piece along the circumference.

13. The automatic unlocking driving device according to claim 10, wherein the driving member is provided separately from the driving shaft, and the driving member is sleeved on the driving shaft and rotates with the driving shaft.

14. The automatic unlocking driving apparatus according to claim 10, wherein the driving member is of a unitary structure with the transmission shaft.

15. The automatic unlocking driving apparatus according to claim 14, wherein the rolling bodies are balls; the driving piece is provided with a groove matched with the ball, the ball part is accommodated in the groove, and the part exposed out of the groove rolls along the sliding groove.

16. The automatic unlocking drive of claim 7, wherein the clutched mating structure includes a first plurality of mating teeth disposed on the locking member and a second plurality of mating teeth disposed on the power take-off member, the first plurality of mating teeth and the second plurality of mating teeth mating when the locking member is in the locked position.

17. The automatic unlocking actuation device of claim 7, wherein the actuation structure comprises a gear actuation assembly.

18. The automatic unlocking driving device according to claim 1, wherein a first plug-in driving structure is arranged on the locking piece, and the first plug-in driving structure drives a second plug-in driving structure arranged on the travelling wheel so as to enable the travelling wheel to rotate.