CN215011736U - Hand-push wheeled vehicle - Google Patents

Abstract

The utility model relates to a hand push wheeled vehicle, include: a body; a wheel; a drive assembly including a self-driven motor and a drive shaft; the clutch mechanism comprises an auxiliary clutch disc connected with the wheel and a main clutch disc which can be driven to be in an engaged or disengaged state with the auxiliary clutch disc; a main engagement drive mechanism to drive the main clutch disc to move toward the sub clutch disc in response to rotation of the self drive motor; the auxiliary meshing driving mechanism is arranged on one side of the main clutch disc, which is back to the auxiliary clutch disc; in the process that the main engagement driving mechanism drives the clutch mechanism to be switched from the disengagement state to the engagement state, the auxiliary engagement driving mechanism provides driving force for driving the main clutch disc to move towards the auxiliary clutch disc, so that the main clutch disc and the auxiliary clutch disc are in the engagement state. The auxiliary meshing driving mechanism gives a meshing starting force and also ensures that the main clutch disc and the auxiliary clutch disc can be normally meshed.

Description

Hand-push wheeled vehicle

Technical Field

The utility model relates to a hand push wheeled vehicle technical field especially relates to this hand push wheeled vehicle's actuating system.

Background

Hand mowers are common hand propelled wheeled vehicles. The hand-push wheeled vehicle is provided with a self-driven transmission mechanism, and power transmission is realized by adopting a clutch mechanism. When the clutch mechanism is in an engaged state, the self-driving motor transmits power to the wheels, and the vehicle can enter a self-driving mode. When the clutch mechanism is in a disengaged state, the self-driven motor does not transmit power to the wheels, and the vehicle can be in a hand-push mode. Similar techniques are disclosed in patent application documents CN206000899U and CN 108235859A.

In the existing self-driven transmission mechanism, in the process of switching a clutch mechanism from a disengagement state to an engagement state, friction force for promoting clutch teeth in the clutch mechanism to axially move is usually generated by using a friction plate similar structure, so that engagement transmission is realized. However, in practice, the applicant finds that the above mode has high requirements on the installation position, size and friction force of the friction plate, the clutch teeth cannot be meshed if the force is too small, and the clutch teeth cannot be disengaged if the force is too large. If the clutch teeth are not engaged, the vehicle cannot enter the self-driving mode.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an improved hand-push wheeled vehicle, which is aimed at the problem that the clutch mechanism is easy to be out of engagement in the existing self-driven transmission mechanism.

A hand-propelled wheeled vehicle includes a body; the driving assembly comprises a self-driving motor and a driving shaft for transmitting the power of the self-driving motor outwards; a clutch mechanism connecting the drive shaft and the wheel, the clutch mechanism including a sub clutch plate connected to the wheel and a main clutch plate driveably engaged with or disengaged from the sub clutch plate; a main engagement drive mechanism to drive the main clutch disc to move toward the sub clutch disc in response to rotation of the self drive motor; the auxiliary meshing driving mechanism is arranged on one side of the main clutch disc, which is back to the auxiliary clutch disc; in the process that the main meshing driving mechanism drives the clutch mechanism to be switched from the disengagement state to the meshing state, the auxiliary meshing driving mechanism provides driving force for driving the main clutch disc to move towards the auxiliary clutch disc so as to enable the main clutch disc and the auxiliary clutch disc to be in the meshing state, and when the main clutch disc and the auxiliary clutch disc are in the meshing state, the auxiliary meshing driving mechanism and the main clutch disc are spaced along the driving shaft.

According to the hand-push wheel type vehicle, the main clutch disc of the clutch mechanism moves in the axial direction of the driving shaft so that the main clutch disc and the auxiliary clutch disc of the clutch mechanism are meshed and separated, and therefore the self-driving motor can drive the driving shaft to rotate, the hand-push wheel type vehicle moves forwards, or the self-driving motor is separated from the wheels, the torsional force is reduced, the energy consumption is reduced, steering is facilitated, and the hand-push wheel type vehicle is good in usability. In addition, compared with the prior art, the auxiliary meshing driving mechanism is added, the meshing starting force is given, the normal meshing of the main clutch disc and the auxiliary clutch disc is also ensured, and the situation that the self-driving does not advance is avoided.

In one embodiment, the auxiliary meshing driving mechanism comprises a movable member capable of moving along the axial direction of the driving shaft and a driving structure for providing axial force to the movable member, meshing teeth are arranged on one side of the movable member, which faces the main clutch disc, meshing teeth are correspondingly arranged on one side of the main clutch disc, which faces the movable member, when the main clutch disc and the auxiliary clutch disc are in a disengagement state, the meshing teeth of the movable member and the meshing teeth of the main clutch disc are at least partially overlapped along the driving shaft, and in the process of switching the clutch mechanism from the disengagement state to the meshing state, the driving structure drives the meshing teeth of the movable member to give driving force to the meshing teeth of the main clutch disc.

In one embodiment, the auxiliary meshing driving mechanism comprises a movable member capable of moving along the axial direction of the driving shaft and a driving structure for providing axial force to the movable member, meshing teeth are arranged on one side of the movable member, which faces the main clutch disc, meshing teeth are correspondingly arranged on one side of the main clutch disc, which faces the movable member, and in the process of switching the clutch mechanism from the disengagement state to the engagement state, the meshing teeth of the driving structure driving the movable member provide driving force for the meshing teeth of the main clutch disc.

In one embodiment, the movable member is provided with engaging teeth on a side facing the main clutch disc, the main clutch disc is correspondingly provided with engaging teeth on a side facing the movable member, and the engaging teeth of the movable member give driving force to the engaging teeth of the main clutch disc in the process of switching the clutch mechanism from the disengagement state to the engagement state.

In one embodiment, the driving structure includes an elastic element, and the elastic element is used for providing a driving force for moving the movable member towards the main clutch disc.

In one embodiment, the driving structure includes an electromagnetic driving element, and the electromagnetic driving element is capable of providing a magnetic force acting on the movable element to drive the movable element to abut against the main clutch disc.

In one embodiment, the hand-push wheeled vehicle further includes a fixed seat fixedly connected to the body, the driving shaft is rotatably disposed in the fixed seat, the movable member is limited by the fixed seat, and during the process of switching the clutch mechanism from the engaged state to the disengaged state, the movable member can move or rotate for a certain stroke along the driving shaft to ensure that the clutch mechanism is disengaged.

In one embodiment, the moveable member is at least partially received within the interior cavity of the stationary base.

In one embodiment, the primary engagement drive mechanism is configured to move toward the secondary clutch plate in response to the rotational speed of the drive shaft being greater than the rotational speed of the wheel to switch the clutch mechanism to the engaged state.

In one embodiment, the main engagement driving mechanism comprises a driving pin arranged on one of the main clutch disc and the driving shaft and a curved surface guiding part arranged on the other of the main clutch disc and the driving shaft, and the curved surface guiding part is a spiral surface or a spiral groove arranged on the main clutch disc.

In one embodiment, the clutch mechanism further comprises an elastic device disposed between the auxiliary clutch disc and the main clutch disc.

In one embodiment, the auxiliary engagement driving mechanism comprises an electromagnetic driving piece for driving the main clutch disc to move towards the auxiliary clutch disc to be in the engagement state with the clutch mechanism.

Drawings

Fig. 1 is a schematic top view of a wheeled hand truck according to an embodiment of the present invention.

Fig. 2 is a schematic side view of a wheeled hand truck according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a clutch mechanism in a hand-push wheeled vehicle according to an embodiment of the present invention.

Fig. 4 is a schematic partial sectional view of a clutch mechanism of a hand-push wheeled vehicle according to an embodiment of the present invention in a disengaged state.

Fig. 5 is a schematic perspective view illustrating a main clutch plate and an auxiliary clutch plate engaged with each other in a hand-push wheeled vehicle according to an embodiment of the present invention.

Fig. 6 is a schematic perspective view of a main clutch plate and an auxiliary clutch plate of a hand-push wheeled vehicle according to an embodiment of the present invention in a disengaged state.

Fig. 7 is a schematic perspective view of a hand-push wheeled vehicle according to another embodiment of the present invention, in which a main clutch plate and an auxiliary clutch plate are disengaged from each other.

Fig. 8 is a schematic perspective view of a hand-push wheeled vehicle according to yet another embodiment of the present invention, in which a main clutch plate and an auxiliary clutch plate are disengaged from each other.

The relevant elements in the figures are numbered correspondingly as follows:

100. a hand-propelled wheeled vehicle; 10. a body; 101. a fixed seat; 20. a wheel; 210. a hub; 220. a wheel axle; 230. a gear mechanism; 30. a drive assembly; 310. a self-driven motor; 320. a transmission mechanism; 330. a drive shaft; 40. a clutch mechanism; 410. an auxiliary clutch disc; 412. a first meshing tooth; 4121. a first mating surface; 4122. a first pushing surface; 420. a main clutch disc; 422. a second meshing tooth; 4221. a second mating surface; 4222. a second pushing surface; 423. a fourth meshing tooth; 4231. a fourth mating surface; 430. a return spring; 510. a drive pin; 520. a curved surface guide part; 60. an auxiliary engagement drive mechanism; 610. a movable member; 612. A third meshing tooth; 6121. a third mating surface; 620. a drive structure; 70. a first electromagnetic drive; 710. A first energizing coil; 720. a first magnet; 80. a second electromagnetic drive; 810. a second electrified coil; 820. a second magnet.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

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 based on the orientation or positional relationship shown in 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 such 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; can be mechanically or electrically connected; 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.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, a hand-push wheeled vehicle 100 according to an embodiment of the present invention is a hand-push mower, including a machine body 10, a working motor (not shown) disposed on the machine body 10, a working assembly (not shown) driven by the working motor to perform work, a wheel 20 pivotably disposed on the machine body 10, a driving assembly 30 for driving the wheel 20 to rotate, and a clutch mechanism 40 connected between the wheel 20 and the driving assembly 30. The clutch mechanism 40 has an engaged state connecting the drive assembly 30 with the wheel 20 to establish power engagement and a disengaged state disconnecting the drive assembly 30 from the wheel 20. The wheel 20, the drive assembly 30 and the clutch mechanism 40 constitute a self-driving system of the hand-propelled wheeled vehicle 100.

For clarity, the direction indicated by the arrow in fig. 1 is defined as the forward first direction, i.e., the forward direction of the hand-propelled wheeled vehicle 100. The direction opposite to the forward first direction indicated by the arrow is a backward second direction, which is the backward direction of the hand-push wheeled vehicle 100.

As shown in fig. 2, the driving assembly 30 includes a self-driven motor 310, a transmission mechanism 320 connected to the self-driven motor 310, and a driving shaft 330 driven by the transmission mechanism 320. Specifically, the transmission mechanism 320 is configured to include a reduction gearbox connected to the self-driven motor 310, the reduction gearbox including a gear reduction mechanism for reducing the rotational motion of the self-driven motor 310 and then transmitting to the drive shaft 330. In this way, the driving shaft 330 is driven by the self-driving motor 310 to rotate in a first direction, and the driving shaft 330 transmits the power of the self-driving motor 310 to the outside, so as to drive the wheel 20 to rotate forward, thereby enabling the hand-propelled wheeled vehicle 100 to travel forward. The fixing base 101 is fixedly connected to the machine body 10, and the driving shaft 330 is inserted into the fixing base 101 and rotatably supported on the fixing base 101 through a bearing. The self-driven motor 310 and the transmission mechanism 320 are supported on the fixing base 101 or directly supported on the machine body 10.

Specifically, the gear reduction mechanism comprises a two-stage planetary gear reduction mechanism and a one-stage parallel gear reduction mechanism. Under the condition of the same reduction ratio, the two-stage planetary gear speed reducing mechanism is small in size, the transmission efficiency of the planetary gear speed reducing mechanism is high, and transmission loss can be effectively reduced.

As shown in fig. 1 and 2, the number of wheels 20 is 2, and is located on both sides of the machine body 10. Accordingly, the clutch mechanism 40 is provided in two places, and each clutch mechanism 40 connects one wheel 20 with the driving shaft 330. The left wheel 20 in fig. 2 is defined as a left wheel, and the right wheel 20 is defined as a right wheel. Specifically, a clutch mechanism 40 is disposed between each end of the driving shaft 330 and the left wheel, and between each end and the right wheel.

In this embodiment, the driving shaft 330 is a shaft made of one piece, and two ends of the driving shaft 330 respectively and correspondingly penetrate through the two corresponding wheels 20 and are connected with each wheel 20 through a bearing. The driving shaft 330 is connected with the wheel 20 through a bearing, when the clutch mechanism 40 is in a disengaged state, the wheel 20 rotates freely relative to the driving shaft 330, the wheel 20 cannot be driven to rotate by the rotation of the driving shaft 330, and only when the clutch mechanism 40 is in an engaged state, the wheel 20 can be driven to rotate by the forward rotation of the driving shaft 330 in the first direction.

Referring to fig. 3 to 6, the clutch mechanism 40 includes a sub clutch plate 410 connected to the wheel 20, and a main clutch plate 420 driveably engaged with or disengaged from the sub clutch plate 410. As shown in fig. 3 and 5, when the main clutch plate 420 and the sub clutch plate 410 are engaged, the clutch mechanism 40 is engaged, and the power of the self-driving motor 310 can be transmitted to the wheels 20, and the hand-push wheeled vehicle 100 is in the self-driving mode. As shown in fig. 4 and 6, when the main clutch plate 420 and the sub clutch plate 410 are in the disengaged state, the clutch mechanism 40 is in the disengaged state, the power of the self-driving motor 310 cannot be transmitted to the wheel 20, the wheel 20 can be rotated in either direction without being subjected to the resistance of the driving assembly 30, and the hand-propelled wheeled vehicle 100 is in the hand-propelled mode.

The main clutch plate 420 is mounted on the driving shaft 330, and the driving shaft 330 is axially movably but non-rotatably provided so that the main clutch plate 420 can transmit power to the sub clutch plate 410 while being engaged with the sub clutch plate 410.

In this embodiment, the drive shaft 330 is disposed parallel to the axle 220 of the wheel 20. The sub clutch plate 410 is rotatably fitted on one end of the driving shaft 330, and the sub clutch plate 410 is embedded in the wheel 20 and transmits power with the axle 220 through the gear mechanism 230. The main clutch plate 420 is engaged with the sub clutch plate 410, the main clutch plate 420 transmits power of the self driving motor 310 to the sub clutch plate 410, and the sub clutch plate 410 drives the wheel shaft 220 to rotate through the gear mechanism 230. When the main clutch plate 420 is disengaged from the sub clutch plate 410, the sub clutch plate 410 is freely rotatable with respect to the drive shaft 330, and the wheel 20 is freely rotatable.

As shown in fig. 3 to 6, in the present embodiment, the sub clutch plate 410 includes a first engaging portion formed on an end surface of the sub clutch plate 410, the first engaging portion is composed of a plurality of first engaging teeth 412 having the same specification, each of the first engaging teeth 412 has a first engaging surface 4121 and a first abutting surface 4122, and the sub clutch plate 410 is embedded in the wheel 20.

Correspondingly, the main clutch plate 420 is provided with a second engagement portion capable of engaging with or disengaging from the first engagement portion, the second engagement portion includes a plurality of second engagement teeth 422 with the same specification, and each second engagement tooth 422 has a second engagement surface 4221 and a second pushing surface 4222. The second engagement teeth 422 are one-way face teeth. The main clutch plate 420 can move in the axial direction of the drive shaft 330 to engage or disengage the second engagement teeth 422 with or from the first engagement teeth 412, thereby enabling the self-driving motor 310 to be coupled with or decoupled from the wheel 20. The engagement and disengagement of the first engaging tooth 412 and the second engaging tooth 422 are realized by the first engaging surface 4121, the second engaging surface 4221, the first abutting surface 4122 and the second abutting surface 4222, which are specifically as follows: when the first engagement surface 4121 is engaged with the second engagement surface 4221, the self-driving motor 310 transmits drive to the wheel 20 through the clutch mechanism 40 to rotate the wheel 20 in the first direction; when the first abutting surface 4122 and the second abutting surface 4222 interact, the main clutch plate 420 is moved away from the wheel 20.

In other embodiments, the driving shaft 330 may be coaxially disposed with the axle 220 of the wheel 20, wherein the sub clutch plate 410 is connected with the wheel 20 to transmit the power of the main clutch plate 420 to the wheel 20. In a specific implementation, the sub clutch plate 410 is fixedly connected to the hub 210 of the wheel 20 or the hub 210 is integrally formed. Specifically, the sub clutch plate 410 is provided on the hub 210 of the wheel 20, and is disposed coaxially with the wheel 20. More specifically, the sub clutch plate 410 is fixed to the hub 210 of the wheel 20, or the sub clutch plate 410 is integrally formed on the hub 210 of the wheel 20. In this embodiment, the auxiliary clutch disk 410 is specifically a face gear, and the meshing teeth are one-way face teeth. In other embodiments, the wheel 20 is a wheel with one-way face teeth when the secondary clutch plate 410 is integrally formed on the hub 210 of the wheel 20.

In order to enable the main clutch plate 420 to move towards the auxiliary clutch plate 410, the hand-propelled wheeled vehicle 100 further comprises a main engagement drive mechanism. The primary engagement drive mechanism drives the primary clutch plate 420 toward the secondary clutch plate 410 in response to rotation of the self-driven motor 310. Specifically, when the self-driven motor 310 rotates in the first direction, the main engagement drive mechanism acts on the main clutch plate 420, and the main clutch plate 420 moves in the axial direction of the drive shaft 330 and approaches the sub clutch plate 410, thereby achieving the engaged state.

In one embodiment, the primary engagement drive mechanism drives the primary clutch plate 420 to move in the axial direction of the drive shaft 330 and close to the secondary clutch plate 410 in response to the rotational speed of the drive shaft 330 being greater than the rotational speed of the wheels 20, so that the clutch mechanism 40 is engaged. Also, the primary engagement drive mechanism is able to cancel the axial force acting on the primary clutch discs 420 in response to the rotational speed of the wheels 20 being greater than the rotational speed of the drive shaft 330. That is, if the rotation speed of the wheel 20 in the first direction exceeds the rotation speed of the driving shaft 330, the driving shaft 330 is continuously connected to the wheel 20 in a transmission manner, the rotation of the wheel 20 will drive the auxiliary clutch disk 410 to rotate together, the auxiliary clutch disk 410 drives the main clutch disk 420 to rotate together, so the driving assembly 30 forms resistance to the rotation of the wheel 20, the main clutch disk 420 and the auxiliary clutch disk 410 are automatically disengaged, the wheel 20 is automatically disengaged from the driving shaft 330, and the wheel 20 can rotate freely.

In this embodiment, as shown in fig. 3 and 5, the main engagement drive mechanism includes a drive pin 510 provided on one of the main clutch plate 420 and the drive shaft 330, and a curved guide 520 provided on the other of the main clutch plate and the drive shaft. Specifically, as shown in fig. 3 and 5, the driving shaft 330 is provided with a driving pin 510, the main clutch disk 420 is provided with a curved guide 520, and the driving pin 510 is slidably disposed in the curved guide 520 and moves in the curved guide 520. Specifically, the curved guide 520 cooperates with the drive pin 510 to limit the moving path of the main clutch disc 420 in the axial direction of the drive shaft 330. The curved surface guide portion 520 has a set length in the axial direction of the drive shaft 330, which is a total stroke length when the first engagement surface 4121 is engaged with the second engagement surface 422 and the first engagement surface 4121 is separated from the second engagement surface 422 without interference therebetween (i.e., the first engagement portion and the second engagement portion are separated). The two ends of the curved guide 520 correspond to the disengaged position and the engaged position when the main clutch plate 420 moves, respectively.

When the driving shaft 330 rotates in the first direction, the driving pin 510 is driven by the rotation of the driving shaft 330 to rotate together, the driving pin 510 abuts against the curved guide 520 and climbs along the curved guide 520, and during the climbing process, the main clutch disc 420 is driven to make a spiral axial movement and finally moves to a position where the main clutch disc is engaged with the auxiliary clutch disc 410. In the present embodiment, the curved guide 520 on the main clutch disk 420 is specifically a spiral surface. In other embodiments, the curved guide 520 may be helically grooved.

The specific operation of the engagement of the clutch mechanism 40 is as follows: when the driving assembly 30 is started, the rotation speed of the driving shaft 330 is greater than that of the wheel 20, the driving pin 510 moves from one end of the curved guide 520 to the other end of the curved guide 520 on one end of the curved guide 520, so that the main engagement driving mechanism drives the main clutch disc 420 to move towards the auxiliary clutch disc 410 along the axial direction of the driving shaft 330, the second engagement surface 4221 of the main clutch disc 420 is engaged with the first engagement surface 4121 of the auxiliary clutch disc 410, the driving of the self-driving motor 310 is transmitted to the wheel 20, and the wheel 20 rotates towards the first direction, so that the linkage is realized. As shown in fig. 4 and 6; when the rotation speed of the wheel 20 is greater than that of the driving shaft 330, the main engagement driving mechanism no longer drives the main clutch disk 420 to move toward the auxiliary clutch disk 410, the first abutting surface 4122 can abut against the second abutting surface 4222 to move the main clutch disk 420 in the axial direction of the driving shaft 330, and the first engaging portion and the second engaging portion are separated (disengaged), so that the driving pin 510 is reset. In this embodiment, the first abutting surface 4122 and the second abutting surface 4222 are arc surfaces that are matched with each other. Of course, in other embodiments, at least one of the first abutting surface 4122 and the second abutting surface 4222 may be a wedge-shaped surface or a spiral inclined surface.

In the above process, the main engagement driving mechanism is used to drive the clutch mechanism 40 to switch from the disengaged state to the engaged state, wherein in the engaged state, the driving shaft 330 drives the wheel 20 to rotate in the first direction, and the hand-push wheeled vehicle 100 is in the self-driving mode. When clutch mechanism 40 is disengaged, wheel 20 is free to rotate relative to drive shaft 330 and hand-propelled wheeled vehicle 100 is in a hand-propelled mode.

In another embodiment, the auxiliary engagement driving mechanism may include a first electromagnetic driver, and the main clutch plate 420 is driven to move toward the sub clutch plate 410 in the axial direction of the driving shaft 330 by the first electromagnetic driver, so that the second engagement surface 4221 is engaged with the first engagement surface 4121. In this embodiment, as shown in fig. 7, the first electromagnetic driving element 70 includes a first electric coil 710 and a first magnet 720, wherein the first electric coil 710 is located on the driving shaft 330, the first magnet 720 is fixed on the main clutch plate 420, and the magnetic field direction of the first magnet 720 is the same as the magnetic field direction of the first electric coil 710 after being electrified. When the driving shaft 330 rotates in the first direction, the first energizing coil 710 is energized to generate a magnetic field, and the first magnet 720 is moved away from the first energizing coil 710 by the repulsive force of the magnetic field to push the main clutch plate 420 to move on the driving shaft 330 in the axial direction of the driving shaft 330 toward the sub clutch plate 410. In other embodiments, the first coil 710 may not be disposed on the driving shaft 330, and may be fixed on one side of the first magnet 720, such as the machine body 10, for pushing the main clutch plate 420; the first electromagnetic driving member 70 may be only the first energizing coil 710, the electromagnetic driving member is disposed on one side of the first engaging portion, the main clutch plate 420 is made of a magnetic material, when the first energizing coil 710 is energized, a magnetic field is generated, the main clutch plate 420 is moved in the direction of the sub clutch plate 410 in the axial direction of the driving shaft 330 by the magnetic force applied to the driving shaft 330, and finally the main clutch plate 420 and the sub clutch plate 410 are engaged, the clutch mechanism 40 couples the self driving motor 310 and the wheel 20, the wheel 20 is rotated in the first direction, and the hand-propelled wheeled vehicle 100 moves forward. The energization time of the first energization coil 710 is a time required to bring the main clutch plate 420 into engagement with the sub clutch plate 410, and if the self drive motor 310 is stopped halfway, the first energization coil 710 is immediately deenergized. When the self-driving motor 310 stops operating (stops), the driving shaft 330 stops rotating, and at this time, when the first coil 710 is de-energized, the user continues to push the hand-push wheeled vehicle 100 to move in the forward direction, the driving wheel continues to rotate clockwise, the wheel 20 drives the auxiliary clutch plate 410 to rotate in the first direction, since the operation of the self-driven motor 310 is stopped, the driving shaft 330 cannot drive the main clutch plate 420 to rotate, the first engaging portion rotates relative to the second engaging portion, the first engaging portion and the second engaging portion are misaligned, when the first abutting surface 4122 on the first engaging portion moves relative to the second abutting surface 4222, the first abutting surface 4122 abuts against the second abutting surface 4222 to allow the main clutch plate 420 to have a large outward driving force and a small circular movement force, thereby separating the main clutch plate 420 and the sub clutch plate 410, see fig. 6.

The hand-push wheeled vehicle 100 of the above embodiment can be switched between the self-drive mode and the hand-push mode at will. The switching from the drive mode to the push mode can be realized by the following modes: when the self-driving motor 310 is in the off state, that is, the self-driving motor 310 is stopped, the hand-push wheeled vehicle 100 is pushed to rotate the wheel 20 in the first direction by a certain angle, so that the speed of the wheel 20 is greater than the speed of the driving shaft 330, and the clutch mechanism 40 is switched to the disengaged state, so that the hand-push wheeled vehicle 100 enters the hand-push mode.

In another embodiment, a control device is provided for rotating the self-driven motor 310 in a second direction opposite to the first direction, which is the "driving direction". The control means is automatically activated immediately when the hand-propelled wheeled vehicle 100 has stopped for more than a predetermined time interval, the main clutch disc 420 being disengaged from the auxiliary clutch disc 410 by the drive, so that upon parking the disengagement of the clutch mechanism 40 occurs automatically, allowing the operator to move the vehicle by simply pushing the hand-propelled wheeled vehicle 100 forward or by causing the hand-propelled wheeled vehicle 100 to be driven backwards, without having to overcome the mechanical resistance that would be caused by the engaged clutch mechanism 40, without any risk of damaging the mechanical mechanism.

In the present embodiment, the control means includes a detection means for directly or indirectly detecting the stop of the rotational driving of the self-driving motor 310, and when a predetermined time interval elapses after the detection means detects the stop of the rotational movement of the self-driving motor 310, the control means controls the self-driving motor 310 to drive the driving shaft 330 to rotate in the backward second direction for a preset time to shift the clutch mechanism 40 to the disengaged state.

Specifically, in the present embodiment, when the self-driven motor 310 rotates in the first direction, the main clutch plate 420 is driven to engage with the sub clutch plate 410 by the main engagement driving mechanism, and when the self-driven motor 310 rotates in the second direction, the first engagement portion rotates relative to the second engagement portion, and the first engagement portion and the second engagement portion are displaced from each other, so that the main clutch plate 420 and the sub clutch plate 410 are separated from each other.

In this embodiment, the driving assembly 30 further includes a control device of the self-driving motor 310, and the control device includes a detection component for directly or indirectly detecting the stop of the rotation driving of the self-driving motor 310, and when a predetermined time interval elapses after the detection component detects the stop of the rotation movement of the self-driving motor 310, the control device controls the self-driving motor 310 to drive the driving shaft 330 to rotate in the backward second direction for a preset time, so that the clutch mechanism 40 is changed to the disengaged state. Specifically, the control means for controlling the rotation of the self-driving motor 310 in the backward second direction is a manually actuated control means.

Further, referring to fig. 3, the clutch mechanism further includes an elastic device 430 disposed between the main clutch plate 420 and the sub clutch plate 410, and the elastic device 430 is preferably a spring. Specifically, one end of the elastic device 430 is connected to the main clutch plate 420, and the other end is connected to the sub clutch plate 410, and the main clutch plate 420 slides axially along the driving shaft 330 with respect to the sub clutch plate 410. It should be noted that the elastic device 430 provides a driving force for moving the main clutch plate 420 away from the auxiliary clutch plate 410. When the self-driven motor 310 rotates in a first direction and drives the wheel 20 to rotate together, the elastic device 430 is compressed and stores energy. When the clutch mechanism 40 is switched to the disengaged state by rotating the wheel 20 in the first direction for a certain angle by pushing the hand-push wheeled vehicle 100, or the control device controls the self-driving motor 310 to rotate the driving shaft 330 in the backward second direction for a predetermined time, so that the clutch mechanism 40 is changed to the disengaged state, the elastic device 430 releases energy, so that the main clutch disc 420 is rapidly disengaged from the auxiliary clutch disc 410.

In the above-described embodiment, the driving force for engaging the main clutch disc 420 with the sub clutch disc 410 is derived from the main engagement driving mechanism in response to the rotation of the drive shaft 330; the driving force for disengaging the main clutch plate 420 from the sub clutch plate 410 is derived from the pushing of the vehicle or the reversing of the drive shaft 330, and is not affected by the main engagement drive mechanism.

In the above embodiment, the main engagement driving mechanism is used to drive the main clutch plate 420 to move toward the auxiliary clutch plate 410 to engage with the auxiliary clutch plate 410. If the driving force of the main engagement driving mechanism is insufficient due to some factor, the main clutch plate 420 and the sub clutch plate 410 may not be engaged, and in a serious case, the vehicle may not be driven by itself.

In view of the above, in one embodiment of the present invention, as shown in fig. 5, the hand-push wheeled vehicle 100 further includes an auxiliary engagement driving mechanism 60 disposed on a side of the main clutch plate 420 facing away from the auxiliary clutch plate 410. When the drive shaft 330 rotates in the first direction, the auxiliary meshing drive mechanism 60 and the main meshing drive mechanism can act together on the main clutch plate 420 of the clutch mechanism 40, so that the clutch mechanism 40 is switched to the meshing state. Specifically, in the disengaged state of the main clutch plate 420 and the auxiliary clutch plate 410, the movable element 610 of the auxiliary meshing drive mechanism 60 may act on the main clutch plate 420 at all times, but the driving force is not enough to drive the main clutch plate 420 to move toward the auxiliary clutch plate 410. When the drive shaft 330 rotates in the first direction, the main engagement drive mechanism functions to drive the main clutch plate 420 to move in the direction of the sub clutch plate 410 together with the auxiliary engagement drive mechanism 60.

Because the auxiliary meshing driving mechanism 60 is arranged to assist the main meshing driving mechanism, the defect that the meshing driving force given to the main clutch disc 420 by the main meshing driving mechanism is not enough to cause the meshing failure is well overcome, the meshing starting is smoother, and the meshing can be well ensured.

The primary engagement drive mechanism acts on the primary clutch plate 420 either synchronously with the secondary engagement drive mechanism 60 or slightly later than the secondary engagement drive mechanism 60. If the primary engagement drive mechanism includes a drive pin 510 provided on one of the primary clutch disk 420 and the drive shaft 330 and a curved guide 520 provided on the other of the primary clutch disk 420 and the drive shaft 330, there may be a gap between the drive pin 510 and the curved guide 520 around the axis of the drive shaft 330 when switching to the self-drive mode is required, and the primary engagement drive mechanism may act on the primary clutch disk 420 later than the secondary engagement drive mechanism 60.

In one embodiment, as shown in fig. 3, 5 and 6, the auxiliary engagement driving mechanism 60 includes a movable member 610 capable of moving along the axial direction of the driving shaft 330, and a driving structure 620, wherein the driving structure 620 includes an elastic element disposed on the driving shaft 330, and the elastic element 620 is configured to provide a driving force for moving the movable member 610 toward the main clutch disc 420. The resilient element is preferably a spring. Specifically, the movable member 610 and the driving structure 620, i.e., the elastic element, are accommodated in the inner cavity of the fixed base 101.

The end surface of the movable member 610 facing the main clutch plate 420 is provided with a third engaging portion, the third engaging portion includes a plurality of third engaging teeth 612 with the same specification, and each third engaging tooth 612 has a third engaging surface 6121. The end surface of the main clutch plate 420 facing the movable member 610 is provided with a fourth engaging portion capable of being engaged with the third engaging portion, the fourth engaging portion includes a plurality of fourth engaging teeth 423 with the same specification, and each fourth engaging tooth 423 has a fourth engaging surface 4231. The third engagement surface 6121 and the fourth engagement surface 4231 are arc surfaces which are matched with each other.

As shown in fig. 5, when the main clutch plate 420 and the sub clutch plate 410 are in the engaged state, the tooth top of the third meshing tooth 612 near the fourth meshing tooth 423 is spaced from the tooth top of the fourth meshing tooth 423 near the third meshing tooth 612 in the axial direction of the drive shaft 330, and the movable member 610 is spaced from the main clutch plate 420. As shown in fig. 6, referring to fig. 5 in combination, in the disengaged state of the main clutch plate 420 and the sub clutch plate 410, the tooth tips of the third meshing teeth 612 and the tooth tips of the fourth meshing teeth 423 overlap in the axial direction of the drive shaft 330. That is, in the disengaged state of the main clutch plate 420 and the sub clutch plate 410, the distance between the tooth tips of the third meshing teeth 612 and the tooth tips of the fourth meshing teeth 423 in the axial direction of the drive shaft 330 is set to be greater than zero and smaller than the disengagement stroke of the main clutch plate 420 and the sub clutch plate 410. In the process that the clutch mechanism 40 is switched from the engaged state to the disengaged state, the movable member 610 is limited by the fixed seat 101, and the movable member 610 can only move within a very effective distance in the axial direction of the driving shaft 330, so that when the clutch mechanism needs to be switched to the engaged state again, the third engaging teeth 612 can be rapidly matched with the fourth engaging teeth 423, and the engaged state is realized.

The operation of the auxiliary engagement drive mechanism 60 is as follows: as shown in fig. 6, the main clutch plate 420 is disengaged from the sub clutch plate 410. At this time, the driving shaft 330 cannot transmit the power of the self-driving motor 310 to the wheel 20, when the hand-push wheel 20 moves forward or backward, the wheel 20 rotates and drives the sub clutch plate 410 to rotate together, so that the main clutch plate 420 moves in a direction away from the sub clutch plate 410, and the fourth engagement surface 4231 drives the movable element 610 to move intermittently away from the main clutch plate 420 by acting on the third engagement surface 6121. That is, the movable member 610 is constantly moved away from the main clutch plate 420 by the main clutch plate 420 and is restored by the elastic member so that the wheel 20 can be pushed.

As shown in fig. 5, when the self-driven motor 310 rotates in the first direction, the main engagement driving mechanism drives the main clutch disc 420 to move towards the auxiliary clutch disc 410, and under the elastic force of the elastic element, the third engagement surface 6121 of the movable element 610 acts on the fourth engagement surface 4231 to drive the main clutch disc 420 to advance spirally, and the auxiliary engagement driving mechanism 60 provides an engagement starting force, thereby ensuring that the main clutch disc 420 and the auxiliary clutch disc 410 are engaged smoothly. When the main clutch disk 420 and the auxiliary clutch disk 410 are engaged, the third engagement surface 6121 of the movable member 610 and the fourth engagement surface 4231 of the main clutch disk 420 are abutted in the axial direction of the drive shaft 330, and the third engagement surface 6121 and the fourth engagement surface 4231 of the movable member 610 are abutted in the circumference around the axis of the drive shaft 330, so that the main clutch disk 420 and the auxiliary clutch disk 410 are prevented from being disengaged accidentally.

In another embodiment, the drive structure 620 of the auxiliary engagement drive mechanism 60 comprises a second electromagnetic drive. Specifically, the driving force for the movable element 610 to act on the main clutch plate 420 is provided by the second electromagnetic driving element. In this embodiment, as shown in fig. 8, the second electromagnetic driving element 80 includes a second electrically conductive coil 810 and a second magnet 820, wherein the second electrically conductive coil 810 is located on the driving shaft 330, the second magnet 820 is fixed on the movable element 610, and the magnetic field direction of the second magnet 820 is the same as the magnetic field direction of the second electrically conductive coil 810 after being energized. When the wheeled cart 100 is turned on, the second electrified coil 810 is kept electrified and generates a magnetic field, and the second magnet 810 tends to move away from the electrified coil due to the repulsive force of the magnetic field, so that the movable member 610 abuts against the main clutch plate 420 in the axial direction.

In this embodiment, the coil may be de-energized after the hand-propelled wheeled vehicle 100 is switched to the hand-propelled mode, or remain energized but the magnetic force imparted to the magnet is less than the force applied when the primary clutch plate 420 and the secondary clutch plate 410 are disengaged. At this time, the driving shaft 330 cannot transmit the power of the self-driving motor 310 to the wheel 20, when the hand-push wheel 20 moves forward or backward, the wheel 20 rotates and drives the sub clutch plate 410 to rotate together, so that the main clutch plate 420 moves in a direction away from the sub clutch plate 410, and the fourth engagement surface 4231 drives the movable element 610 to move intermittently away from the main clutch plate 420 by acting on the third engagement surface 6121.

Further, the movable member 610 and the fixed base 101 are configured to be able to rotate relatively. When the main clutch plate 420 moves away from the auxiliary clutch plate 410, the main clutch plate 420 may rotate within a small angle, so that the movable member 610 and the fixed base 101 are configured to rotate within a small angle, such as 5 degrees, to facilitate the disengagement of the main clutch plate 420 and the auxiliary clutch plate 410.

In summary, the hand-push wheeled vehicle 100 is provided with the clutch mechanism 40, and the main clutch disc 420 of the clutch mechanism 40 moves in the axial direction of the driving shaft 330 to engage and disengage the main clutch disc 420 and the auxiliary clutch disc 410 of the clutch mechanism 40, so that the driving shaft 330 can be driven by the self-driving motor 310 to rotate, and the hand-push wheeled vehicle 100 moves forward, or the self-driving motor 310 is disengaged from the wheels 20, thereby reducing the torsion force, reducing the energy consumption, facilitating the steering and having good usability. In addition, compared with the prior art, the auxiliary meshing driving mechanism 60 is added to give a meshing starting force, so that the main clutch disc 420 and the auxiliary clutch disc 410 can be normally meshed, and the situation that self-driving does not advance is avoided.

In the above embodiment, the hand-push wheeled vehicle 100 is described as an example of a hand-push mower, but the hand-push wheeled vehicle 100 may be a hand-push snow sweeper, a hand-push sweeper, or the like.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A hand-propelled wheeled vehicle comprising:

a body;

wheels which are pivotally arranged on the machine body,

a driving assembly including a self-driving motor and a driving shaft transmitting power of the self-driving motor to the outside;

the clutch mechanism is used for connecting the driving shaft and the wheels and comprises an auxiliary clutch disc and a main clutch disc which is in an engaged or disengaged state with the auxiliary clutch disc in a driving mode;

a main engagement drive mechanism to drive the main clutch disc to move toward the sub clutch disc in response to rotation of the self drive motor;

the auxiliary clutch device is characterized by also comprising an auxiliary meshing driving mechanism which is arranged on one side of the main clutch disc back to the auxiliary clutch disc;

in the process that the main meshing driving mechanism drives the clutch mechanism to be switched from a disengagement state to an engagement state, the auxiliary meshing driving mechanism provides driving force for driving the main clutch disc to move towards the auxiliary clutch disc so as to enable the main clutch disc and the auxiliary clutch disc to be in an engagement state; when the main clutch disc and the auxiliary clutch disc are in an engaged state, the auxiliary engagement driving mechanism and the main clutch disc are spaced along the driving shaft.

2. The hand-propelled wheeled vehicle as claimed in claim 1, wherein the auxiliary engagement driving mechanism includes a movable member movable in an axial direction of the driving shaft, and a driving structure for applying an axial force to the movable member, wherein the movable member is provided with engaging teeth on a side thereof facing the main clutch disc, the main clutch disc is correspondingly provided with engaging teeth on a side thereof facing the movable member, the engaging teeth of the movable member and the engaging teeth of the main clutch disc at least partially overlap along the driving shaft when the main clutch disc and the auxiliary clutch disc are in a disengaged state, and the engaging teeth of the movable member are driven by the driving structure to apply a driving force to the engaging teeth of the main clutch disc when the clutch mechanism is switched from the disengaged state to the engaged state.

3. Hand-propelled wheeled vehicle according to claim 2, characterised in that the drive structure comprises an elastic element for providing a driving force for moving the movable member towards the main clutch disc.

4. Hand-propelled wheeled vehicle according to claim 2, characterised in that the drive structure comprises an electromagnetic drive capable of providing a magnetic force acting on the mobile element to drive it against the main clutch disc.

5. A hand-push wheeled vehicle as claimed in claim 2, characterized in that the hand-push wheeled vehicle further comprises a fixed seat fixedly connected to the body, the driving shaft is rotatably arranged in the fixed seat, the movable member is retained by the fixed seat, and during the switching of the clutch mechanism from the engaged state to the disengaged state, the movable member can move or rotate along the driving shaft for a certain distance to ensure the disengagement of the clutch mechanism.

6. Hand-propelled wheeled vehicle according to claim 5, characterised in that the mobile element is at least partially accommodated in an internal cavity of the fixed seat.

7. Hand-propelled wheeled vehicle according to claim 1, characterised in that the primary engagement drive mechanism is configured to move towards the secondary clutch disc in response to the rotational speed of the drive shaft being greater than the rotational speed of the wheel, so as to switch the clutch mechanism into the engaged state.

8. Hand-propelled wheeled vehicle according to claim 7, characterised in that the primary engagement drive comprises a drive pin provided on one of the primary clutch disc and the drive shaft, and a curved guide provided on the other of the primary clutch disc and the drive shaft, the curved guide being a helicoidal or helically grooved guide provided on the primary clutch disc.

9. Hand-propelled wheeled vehicle according to claim 1, characterised in that the clutch mechanism further comprises elastic means arranged between the auxiliary clutch disc and the main clutch disc.

10. Hand-propelled wheeled vehicle according to claim 1, characterised in that the auxiliary engagement drive comprises an electromagnetic drive for driving the main clutch disc in the direction of the auxiliary clutch disc into the engaged state with the clutch mechanism.

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