Hand wheeled vehicle

Abstract

The present invention relates to a hand-pushed wheeled vehicle, comprising: a body; a wheel; a driving assembly, including a self-driving motor and a driving shaft; a clutch mechanism, including a secondary clutch disc connected to the wheel, and a main clutch disc that can be driven to be in a meshing or disengaging state with the secondary clutch disc; a main meshing drive mechanism, used to drive the main clutch disc to move toward the secondary clutch disc in response to the rotation of the self-driving motor; an auxiliary meshing drive mechanism, which is arranged on the side of the main clutch disc facing away from the secondary clutch disc; in the process of the main meshing drive mechanism driving the clutch mechanism to switch from the disengaged state to the engaged state, the auxiliary meshing drive mechanism provides a driving force to drive the main clutch disc to move toward the secondary clutch disc, so that the main clutch disc and the secondary clutch disc reach a meshing state. The auxiliary meshing drive mechanism provides a meshing starting force and also ensures that the main clutch disc and the secondary clutch disc can mesh normally.

Description

Technical Field

[0001] The invention relates to the technical field of hand-pushed wheeled vehicles, in particular to a driving system of the hand-pushed wheeled vehicle. Background Art

[0002] A hand-push lawn mower is a common hand-push wheeled vehicle. This type of hand-push wheeled vehicle is provided with a self-driving transmission mechanism, and a clutch mechanism is used to realize power transmission. 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-driving motor does not transmit power to the wheels, and the vehicle can enter a hand-push mode. Similar technologies are disclosed in patent application documents CN206000899U and CN108235859A.

[0003] In the existing self-driving transmission mechanism, when the clutch mechanism is converted from the disengaged state to the engaged state, the friction plate and similar structure are usually used to generate friction force that causes the clutch teeth in the clutch mechanism to move axially, thereby realizing the meshing transmission. However, the applicant has found in practice that the above method has high requirements for the control of the installation position, size and friction force of the friction plate. If the force is too small, the clutch teeth cannot be engaged, such as not meshing in place, and if the force is too large, the clutch teeth cannot be disengaged. If the clutch teeth are not meshed in place, the vehicle will not be able to enter the self-driving mode. Summary of the invention

[0004] Based on this, it is necessary to provide an improved hand-pushed wheeled vehicle to address the problem that the clutch mechanism in the existing self-driving transmission mechanism is prone to poor engagement.

[0005] A hand-pushed wheeled vehicle comprises a body; a wheel, the wheel being pivotally arranged on the body, a drive assembly comprising a self-driving motor and a drive shaft for transmitting the power of the self-driving motor outward; a clutch mechanism connecting the drive shaft and the wheel, the clutch mechanism comprising a secondary clutch disc connected to the wheel, and a main clutch disc drivably engaged or disengaged with the secondary clutch disc; a main engagement drive mechanism for driving the main clutch disc toward the secondary clutch disc in response to the rotation of the self-driving motor The auxiliary engagement drive mechanism is arranged on the side of the main clutch disk facing away from the auxiliary clutch disk; in the process of the main engagement drive mechanism driving the clutch mechanism to switch from the disengaged state to the engaged state, the auxiliary engagement drive mechanism provides a driving force for driving the main clutch disk toward the auxiliary clutch disk, so that the main clutch disk and the auxiliary clutch disk are in an engaged state, and when the main clutch disk and the auxiliary clutch disk are in an engaged state, the auxiliary engagement drive mechanism and the main clutch disk are spaced apart along the drive shaft.

[0006] The above-mentioned hand-pushed wheeled vehicle is caused by the main clutch disc of the clutch mechanism moving in the axial direction of the drive shaft to make the main clutch disc and the auxiliary clutch disc of the clutch mechanism engage and disengage, so that the self-driving motor can drive the drive shaft to rotate, and the hand-pushed wheeled vehicle moves forward, or the self-driving motor is disengaged from the wheel, which reduces the torsional force, reduces energy consumption, facilitates steering, and has good usability. In addition, compared with the prior art, an auxiliary engagement drive mechanism is added to provide engagement starting force, and also ensure that the main clutch disc and the auxiliary clutch disc can be engaged normally, avoiding the situation where the self-drive does not move forward.

[0007] In one embodiment, the auxiliary engagement drive mechanism includes a movable part that can move axially along the drive shaft, and a driving structure that provides axial force to the movable part. The movable part is provided with engaging teeth on a side facing the main clutch disk, and the main clutch disk is correspondingly provided with engaging teeth on a side facing the movable part. When the main clutch disk and the auxiliary clutch disk are in a disengaged state, the engaging teeth of the movable part at least partially overlap with the engaging teeth of the main clutch disk along the drive shaft. During the process of switching the clutch mechanism from the disengaged state to the engaged state, the driving structure drives the engaging teeth of the movable part to provide driving force to the engaging teeth of the main clutch disk.

[0008] In one embodiment, the auxiliary engagement drive mechanism includes a movable part that can move axially along the drive shaft, and a driving structure that provides axial force to the movable part, and the side of the movable part facing the main clutch disk is provided with engaging teeth, and the side of the main clutch disk facing the movable part is correspondingly provided with engaging teeth. During the process of the clutch mechanism switching from the disengaged state to the engaged state, the driving structure drives the engaging teeth of the movable part to provide driving force to the engaging teeth of the main clutch disk.

[0009] In one of the embodiments, the side of the movable part facing the main clutch disk is provided with meshing teeth, and the side of the main clutch disk facing the movable part is correspondingly provided with meshing teeth. During the process of switching the clutch mechanism from the disengaged state to the engaged state, the meshing teeth of the movable part provide driving force to the meshing teeth of the main clutch disk.

[0010] In one embodiment, the driving structure includes an elastic element, and the elastic element provides a driving force to move the movable member toward the main clutch disc.

[0011] In one embodiment, the driving structure includes an electromagnetic driving member, and the electromagnetic driving member can provide a magnetic field force acting on the movable member to drive the movable member to abut against the main clutch plate.

[0012] In one embodiment, the hand-pushed wheeled vehicle also includes a fixed seat fixedly connected to the body, the drive shaft is rotatably transmitted in the fixed seat, the movable part is limited by the fixed seat, and during the process of the clutch mechanism switching from the engaged state to the disengaged state, the movable part can move or rotate a certain distance along the drive shaft to ensure that the clutch mechanism is disengaged.

[0013] In one embodiment, the movable member is at least partially accommodated in the inner cavity of the fixed base.

[0014] In one of the embodiments, the primary engagement drive mechanism is configured to move toward the secondary clutch plate in response to a rotation speed of the drive shaft being greater than a rotation speed of the wheel, so as to switch the clutch mechanism to the engaged state.

[0015] In one embodiment, the main meshing drive mechanism includes a drive pin provided on one of the main clutch disc and the drive shaft, and a curved guide portion provided on the other of the two, wherein the curved guide portion is a spiral surface or a spiral groove provided on the main clutch disc.

[0016] In one of the embodiments, the clutch mechanism further includes an elastic device disposed between the auxiliary clutch disc and the main clutch disc.

[0017] In one embodiment, the auxiliary engagement drive mechanism includes an electromagnetic drive member to drive the main clutch disc to move toward the auxiliary clutch disc until it is in the engagement state with the clutch mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a top view of a hand-pushed wheeled vehicle according to an embodiment of the present invention.

[0019] Figure 2 The figure is a side view of a push wheeled vehicle according to an embodiment of the present invention.

[0020] Figure 3 The figure is a cross-sectional structural schematic diagram of a clutch mechanism in a hand-pushed wheeled vehicle in an embodiment of the present invention in an engaged state.

[0021] Figure 4 The diagram is a partial cross-sectional structural diagram of a clutch mechanism in a hand-pushed wheeled vehicle in an embodiment of the present invention in a disengaged state.

[0022] Figure 5 The present invention is a three-dimensional schematic diagram of a main clutch disc and a secondary clutch disc in a hand-pushed wheeled vehicle in an embodiment of the present invention in a meshing state.

[0023] Figure 6 The present invention is a three-dimensional schematic diagram of a manual wheeled vehicle in which a main clutch disc and a secondary clutch disc are in a disengaged state.

[0024] Figure 7 It is a three-dimensional schematic diagram showing a main clutch disc and a secondary clutch disc in a hand-pushed wheeled vehicle in another embodiment of the present invention in a disengaged state.

[0025] Figure 8 This is a three-dimensional schematic diagram of a manual wheeled vehicle in another embodiment of the present invention, in which a main clutch disc and a secondary clutch disc are in a disengaged state.

[0026] The corresponding numbers of the relevant components in the figure are as follows:

[0027] 100, hand-pushed wheeled vehicle; 10, body; 101, fixed seat; 20, wheel; 210, wheel hub; 220, wheel axle; 230, gear mechanism; 30, drive assembly; 310, self-driving motor; 320, transmission mechanism; 330, drive shaft; 40, clutch mechanism; 410, secondary clutch plate; 412, first meshing teeth; 4121, first meshing surface; 4122, first push surface; 420, primary clutch plate; 422, second meshing teeth; 4221, second meshing surface; 42 22. second thrust surface; 423. fourth meshing tooth; 4231. fourth meshing surface; 430. elastic device; 510. drive pin; 520. curved guide portion; 60. auxiliary meshing drive mechanism; 610. movable part; 612. third meshing tooth; 6121. third meshing surface; 620. drive structure; 70. first electromagnetic drive part; 710. first energized coil; 720. first magnet; 80. second electromagnetic drive part; 810. second energized coil; 820. second magnet. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] refer to Figure 1 and Figure 2The hand-pushed wheeled vehicle 100 of one embodiment of the present invention is specifically a hand-pushed lawn mower, comprising a body 10, a working motor (not shown) arranged on the body 10, a working assembly (not shown) driven by the working motor to perform work, and a wheel 20 pivotally arranged on the 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 in which the driving assembly 30 is connected to the wheel 20 to form a power engagement and a disengaged state in which the driving assembly 30 is disconnected from the power engagement of the wheel 20. The wheel 20, the driving assembly 30 and the clutch mechanism 40 constitute a self-driving system of the hand-pushed wheeled vehicle 100.

[0035] For clarity, define Figure 1 The direction indicated by the middle arrow is a first forward direction, that is, the forward direction of the hand-pushed wheeled vehicle 100. The direction opposite to the first forward direction indicated by the arrow is a second backward direction, that is, the backward direction of the hand-pushed wheeled vehicle 100.

[0036] like Figure 2 As shown, the drive assembly 30 includes a self-driving motor 310, a transmission mechanism 320 connected to the self-driving motor 310, and a drive shaft 330 driven by the transmission mechanism 320. Specifically, the transmission mechanism 320 is configured to include a reduction box connected to the self-driving motor 310, and the reduction box includes a gear reduction mechanism for reducing the rotational motion of the self-driving motor 310 and then transmitting it to the drive shaft 330. In this way, the self-driving motor 310 can drive the drive shaft 330 to rotate in a first direction, and the drive shaft 330 transmits the power of the self-driving motor 310 outward, thereby driving the wheel 20 to rotate forward, so that the hand-pushing wheeled vehicle 100 moves forward. A fixed seat 101 is fixedly connected to the body 10, and the drive shaft 330 is inserted into the fixed seat 101 and rotatably supported on the fixed seat 101 through a bearing. The self-driving motor 310 and the transmission mechanism 320 are supported on the fixed seat 101 or directly supported on the body 10.

[0037] Specifically, the gear reduction mechanism includes a two-stage planetary gear reduction mechanism and a one-stage parallel gear reduction mechanism. Under the same reduction ratio, the two-stage planetary gear reduction mechanism has a smaller volume, and the planetary gear reduction mechanism has a higher transmission efficiency, which can effectively reduce transmission loss.

[0038] like Figure 1 and Figure 2 As shown, there are two wheels 20, which are located on both sides of the machine body 10. Accordingly, the clutch mechanism 40 is provided at two locations, and each clutch mechanism 40 connects one wheel 20 and the drive shaft 330 respectively. Figure 2The wheel 20 on the left side is defined as the left wheel, and the wheel 20 on the right side is defined as the right wheel. Specifically, a clutch mechanism 40 is respectively arranged between the two ends of the drive shaft 330 and the left wheel, and between the two ends of the drive shaft 330 and the right wheel.

[0039] In this embodiment, the drive shaft 330 is a shaft made of one piece, and the two ends of the drive shaft 330 are respectively correspondingly inserted into the corresponding two wheels 20, and connected to each wheel 20 through a bearing. The drive shaft 330 is connected to the wheel 20 through a bearing. When the clutch mechanism 40 is in a disengaged state, the wheel 20 rotates freely relative to the drive shaft 330, and the rotation of the drive shaft 330 cannot drive the wheel 20 to rotate. Only when the clutch mechanism 40 is in a meshing state, the forward rotation of the drive shaft 330 in the first direction can drive the wheel 20 to rotate.

[0040] Combination Figures 3 to 6 The clutch mechanism 40 includes a secondary clutch disc 410 connected to the wheel 20, and a primary clutch disc 420 that can be driven to be in a meshing or disengaging state with the secondary clutch disc 410. Figure 3 and Figure 5 As shown, when the main clutch plate 420 and the auxiliary clutch plate 410 are in meshing state, the clutch mechanism 40 is in meshing state, at which time the power of the self-driving motor 310 can be transmitted to the wheel 20, and the hand-pushed wheeled vehicle 100 is in self-driving mode. Figure 4 and Figure 6 As shown, when the main clutch disc 420 and the auxiliary clutch disc 410 are in a disengaged state, the clutch mechanism 40 is in a disengaged state. At this time, the power of the self-drive motor 310 cannot be transmitted to the wheel 20. The wheel 20 can rotate in either direction without being resisted by the drive assembly 30. The hand-pushed wheeled vehicle 100 is in a hand-pushed mode that can be pushed.

[0041] The main clutch disc 420 is mounted on the drive shaft 330 , and the drive shaft 330 is configured to be axially movable but not relatively rotatable, so that the main clutch disc 420 can transmit power to the auxiliary clutch disc 410 when meshing with the auxiliary clutch disc 410 .

[0042] In this embodiment, the drive shaft 330 is arranged parallel to the axle 220 of the wheel 20. The secondary clutch disc 410 is rotatably sleeved on one end of the drive shaft 330, and the secondary clutch disc 410 is embedded in the wheel 20 and transmits power to the axle 220 through the gear mechanism 230. The main clutch disc 420 is meshed with the secondary clutch disc 410, and the main clutch disc 420 transmits the power of the self-driving motor 310 to the secondary clutch disc 410, and the secondary clutch disc 410 drives the axle 220 to rotate through the gear mechanism 230. When the main clutch disc 420 is disengaged from the secondary clutch disc 410, the secondary clutch disc 410 can rotate freely relative to the drive shaft 330, and the wheel 20 can rotate freely.

[0043] like Figures 3 to 6 As shown, in this embodiment, the auxiliary clutch disc 410 includes a first meshing portion formed on the end surface of the auxiliary clutch disc 410, and the first meshing portion is composed of a plurality of first meshing teeth 412 of the same specification, and each first meshing tooth 412 has a first meshing surface 4121 and a first thrust surface 4122, and the auxiliary clutch disc 410 is embedded in the wheel 20.

[0044] Correspondingly, the main clutch plate 420 is provided with a second meshing portion that can be engaged or disengaged with the first meshing portion, and the second meshing portion includes a plurality of second meshing teeth 422 of the same specification, and each second meshing tooth 422 has a second meshing surface 4221 and a second thrust surface 4222. The second meshing teeth 422 are one-way end face teeth. The main clutch plate 420 can move in the axial direction of the drive shaft 330 to engage or disengage the second meshing teeth 422 with the first meshing teeth 412, thereby realizing the linkage or disengagement between the self-drive motor 310 and the wheel 20. The engagement and disengagement of the first meshing tooth 412 and the second meshing tooth 422 are achieved through the first meshing surface 4121, the second meshing surface 4221, the first thrust surface 4122, and the second thrust surface 4222. Specifically, when the first meshing surface 4121 and the second meshing surface 4221 are meshed, the self-drive motor 310 transmits the drive to the wheel 20 through the clutch mechanism 40 to rotate the wheel 20 in the first direction; when the first thrust surface 4122 and the second thrust surface 4222 interact with each other, the main clutch plate 420 is moved away from the wheel 20.

[0045] In other embodiments, the drive shaft 330 and the axle 220 of the wheel 20 can be coaxially arranged, wherein the secondary clutch disc 410 is connected to the wheel 20 to transmit the power of the primary clutch disc 420 to the wheel 20. In specific implementation, the secondary clutch disc 410 is fixedly connected to the hub 210 of the wheel 20 or the hub 210 is integrally formed. Specifically, the secondary clutch disc 410 is arranged on the hub 210 of the wheel 20 and is coaxially arranged with the wheel 20. More specifically, the secondary clutch disc 410 is fixed on the hub 210 of the wheel 20, or the secondary clutch disc 410 is integrally formed on the hub 210 of the wheel 20. In this embodiment, the secondary clutch disc 410 is specifically a face gear, and the meshing teeth are unidirectional face teeth. In other embodiments, when the secondary clutch disc 410 is integrally formed on the hub 210 of the wheel 20, the wheel 20 is a wheel with unidirectional face teeth.

[0046] In order to enable the main clutch disc 420 to move toward the secondary clutch disc 410, the push wheeled vehicle 100 further includes a main meshing drive mechanism. The main meshing drive mechanism drives the main clutch disc 420 to move toward the secondary clutch disc 410 in response to the rotation of the self-driving motor 310. Specifically, when the self-driving motor 310 rotates in the first direction, the main meshing drive mechanism acts on the main clutch disc 420, causing the main clutch disc 420 to move along the axial direction of the drive shaft 330 and approach the secondary clutch disc 410, thereby achieving a meshing state.

[0047] In one embodiment, the main meshing drive mechanism drives the main clutch disc 420 to move along the axial direction of the drive shaft 330 and approach the secondary clutch disc 410 in response to the rotation speed of the drive shaft 330 being greater than the rotation speed of the wheel 20, so that the clutch mechanism 40 is in a meshing state. In addition, the main meshing drive mechanism can cancel the axial force acting on the main clutch disc 420 in response to the rotation speed of the wheel 20 being greater than the rotation 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 drive shaft 330, the drive shaft 330 continues to be connected to the wheel 20, the rotation of the wheel 20 will drive the secondary clutch disc 410 to rotate together, and the secondary clutch disc 410 drives the main clutch disc 420 to rotate together, so that the drive assembly 30 constitutes a resistance to the rotational movement of the wheel 20, the main clutch disc 420 and the secondary clutch disc 410 are automatically disengaged, the wheel 20 is automatically disengaged from the drive shaft 330, and the wheel 20 can rotate freely.

[0048] In this embodiment, combined with Figure 3 , Figure 5 As shown, the main meshing drive mechanism includes a driving pin 510 disposed on one of the main clutch plate 420 and the drive shaft 330, and a curved surface guide portion 520 disposed on the other of the two. Figure 3 and Figure 5 As shown, a driving pin 510 is provided on the driving shaft 330, and a curved guide portion 520 is provided on the main clutch disc 420, and the driving pin 510 is slidably provided in the curved guide portion 520 and moves in the curved guide portion 520. Specifically, the curved guide portion 520 cooperates with the driving pin 510 to limit the moving path of the main clutch disc 420 in the axial direction of the driving shaft 330. The curved guide portion 520 has a set length along the axial direction of the driving shaft 330, and the set length enables the first meshing surface 4121 to mesh with the second meshing surface 4221, and the first meshing surface 4121 can be separated from the second meshing surface 4221 without forming interference with each other (i.e., the first meshing portion and the second meshing portion are separated). The two ends of the curved guide portion 520 correspond to the disengagement position and the meshing position when the main clutch disc 420 moves.

[0049] When the drive shaft 330 rotates in the first direction, the rotation of the drive shaft 330 drives the drive pin 510 to rotate together, and the drive pin 510 abuts against the curved surface guide portion 520 and climbs along the curved surface guide portion 520. During the climbing process, the main clutch disc 420 is driven to make a spiral axial movement, and finally moves to a position meshing with the auxiliary clutch disc 410. In this embodiment, the curved surface guide portion 520 on the main clutch disc 420 is specifically a spiral surface. In other embodiments, the curved surface guide portion 520 can also be a spiral groove.

[0050] The specific working process of the above-mentioned clutch mechanism 40 engagement is as follows: the drive assembly 30 is started, the rotation speed of the drive shaft 330 is greater than the rotation speed of the wheel 20, and the drive pin 510 moves from one end of the curved guide part 520 to the other end of the curved guide part 520, so that the main engagement drive mechanism drives the main clutch disc 420 to move along the axial direction of the drive shaft 330 toward the auxiliary clutch disc 410, and then 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, so as to transmit the drive of the self-drive motor 310 to the wheel 20, and the wheel 20 rotates in the first direction to realize linkage. Figure 4 and Figure 6 As shown; when the self-driving motor 310 stops running, if the rotation speed of the wheel 20 is greater than the rotation speed of the drive shaft 330, the main meshing drive mechanism no longer drives the main clutch disc 420 to move toward the auxiliary clutch disc 410, and the first push surface 4122 can push the second push surface 4222 to make the main clutch disc 420 move axially with the drive shaft 330 and make the first meshing portion and the second meshing portion separate (disengage), and the drive pin 510 is reset. In this embodiment, the first push surface 4122 and the second push surface 4222 are arc-shaped surfaces that match each other. Of course, in other embodiments, at least one of the first push surface 4122 and the second push surface 4222 can be a wedge-shaped surface or a spiral inclined surface.

[0051] In the above process, the main meshing drive mechanism is used to drive the clutch mechanism 40 to switch from the disengaged state to the meshed state, wherein in the meshed state, the drive shaft 330 drives the wheel 20 to rotate in the first direction, and the hand-pushed wheeled vehicle 100 is in the self-driving mode. When the clutch mechanism 40 is in the disengaged state, the wheel 20 can rotate freely relative to the drive shaft 330, and the hand-pushed wheeled vehicle 100 is in the hand-pushing mode.

[0052] In another embodiment, the auxiliary engagement drive mechanism may include a first electromagnetic drive member, which drives the main clutch disc 420 to move toward the auxiliary clutch disc 410 in the axial direction of the drive shaft 330, so that the second engagement surface 4221 is engaged with the first engagement surface 4121. In this embodiment, Figure 7As shown, the first electromagnetic driving member 70 includes a first energized coil 710 and a first magnet 720, wherein the first energized coil 710 is located on the drive shaft 330, and the first magnet 720 is fixed on the main clutch disc 420, and the magnetic field direction of the first magnet 720 is the same as the magnetic field direction of the first energized coil 710 after being energized. After the drive shaft 330 rotates in the first direction, the first energized coil 710 is energized and generates a magnetic field, and the first magnet 720 moves in a direction away from the first energized coil 710 due to the repulsive force of the magnetic field, thereby pushing the main clutch disc 420 to move on the drive shaft 330 along the axial direction of the drive shaft 330 toward the auxiliary clutch disc 410. In other embodiments, the first energized coil 710 may not be arranged on the drive shaft 330, and it may be fixed on one side of the first magnet 720, such as fixed to the body 10 to realize pushing the main clutch disc 420; the first electromagnetic driving component 70 may also be just the first energized coil 710, which is arranged on one side of the first meshing portion, and the main clutch disc 420 is a magnetic material. When the first energized coil 710 is energized, a magnetic field is generated, and the main clutch disc 420 is moved on the drive shaft 330 along the axial direction of the drive shaft 330 toward the auxiliary clutch disc 410 under the force of the magnetic field, and finally the main clutch disc 420 is meshed with the auxiliary clutch disc 410, and the clutch mechanism 40 links the self-drive motor 310 with the wheel 20, the wheel 20 rotates in the first direction, and the hand-pushed wheeled vehicle 100 moves forward. The energizing time of the first energizing coil 710 is the time required for the primary clutch disc 420 and the secondary clutch disc 410 to mesh. If the self-driving motor 310 stops during the process, the first energizing coil 710 is immediately de-energized. When the self-driving motor 310 stops running (shutdown), the driving shaft 330 stops rotating. At this time, the first energized coil 710 is de-energized. The user continues to push the hand-pushed wheeled vehicle 100 to move forward, the driving wheel will continue to rotate clockwise, and the wheel 20 will drive the secondary clutch disc 410 to rotate in the first direction. However, since the self-driving motor 310 has stopped running at this time, the driving shaft 330 will not be able to drive the main clutch disc 420 to rotate. The first meshing portion rotates relative to the second meshing portion, and the first meshing portion and the second meshing portion will be misaligned. When the first push surface 4122 on the first meshing portion moves relative to the second push surface 4222, the first push surface 4122 pushes against the second push surface 4222 to make the main clutch disc 420 have a larger outward push drive and a smaller circular motion force, thereby separating the main clutch disc 420 and the secondary clutch disc 410. Please refer to Figure 6 .

[0053] The hand-pushed wheeled vehicle 100 of the above embodiment can be switched between the self-driving mode and the hand-pushing mode at will. The switching from the self-driving mode to the hand-pushing mode can be achieved in the following manner: the self-driving motor 310 is in the off state, that is, the self-driving motor 310 stops, and the hand-pushed wheeled vehicle 100 is pushed to rotate the wheel 20 along the first direction by a certain angle, so that the speed of the wheel 20 is greater than the speed of the drive shaft 330, and then the clutch mechanism 40 is switched to the disengaged state, and the hand-pushed wheeled vehicle 100 enters the hand-pushing mode.

[0054] In another embodiment, a control device is provided to rotate the self-drive motor 310 in a second direction opposite to the "drive direction", i.e., the first direction. The control device is automatically actuated immediately when the push wheeled vehicle 100 has been stopped for more than a predetermined time interval, and the primary clutch disc 420 is driven to separate from the secondary clutch disc 410, so that when parking, the disengagement of the clutch mechanism 40 occurs automatically, allowing the operator to move the vehicle simply by pushing the push wheeled vehicle 100 forward or by causing the push wheeled vehicle 100 to be driven backward, without having to overcome the mechanical resistance that would be caused by the engaged clutch mechanism 40, and without any risk of damaging the mechanical mechanism.

[0055] In this embodiment, the control device includes a detection component for directly or indirectly detecting the cessation of the rotational drive of the self-drive motor 310. When the detection component detects that the rotational movement of the self-drive motor 310 has stopped, after a predetermined time interval, the control device controls the self-drive motor 310 to drive the drive shaft 330 to rotate in the second backward direction for a preset time to change the clutch mechanism 40 into a disengaged state.

[0056] Specifically, in this embodiment, when the self-drive motor 310 rotates in a first direction, the main clutch disk 420 is driven to engage with the auxiliary clutch disk 410 through the main engagement drive mechanism. When the self-drive motor 310 rotates in a second direction, the first engagement portion rotates relative to the second engagement portion, and the first engagement portion and the second engagement portion will be misaligned, thereby separating the main clutch disk 420 and the auxiliary clutch disk 410.

[0057] In this embodiment, the drive assembly 30 further includes a self-driving motor 310 control device, and the control device includes a detection component for directly or indirectly detecting the stop of the rotation drive of the self-driving motor 310. When the detection component detects that the rotation movement of the self-driving motor 310 stops, after a predetermined time interval, the control device controls the self-driving motor 310 to drive the drive shaft 330 to rotate in the second backward direction for a preset time, so that the clutch mechanism 40 is converted into a disengaged state. Specifically, the control device for controlling the self-driving motor 310 to rotate in the second backward direction is a manually actuated control device.

[0058] Further, refer to Figure 3As shown, the clutch mechanism also includes an elastic device 430 disposed between the main clutch disc 420 and the secondary clutch disc 410, and the elastic device 430 is preferably a spring. Specifically, one end of the elastic device 430 is connected to the main clutch disc 420, and the other end is connected to the secondary clutch disc 410, and the main clutch disc 420 slides axially along the drive shaft 330 relative to the secondary clutch disc 410. It should be noted that the elastic device 430 provides a driving force to move the main clutch disc 420 away from the secondary clutch disc 410. When the self-driving motor 310 rotates in the first direction and drives the wheel 20 to rotate together, the above-mentioned elastic device 430 is compressed and stores energy. When the hand-pushed wheeled vehicle 100 is pushed to rotate the wheel 20 in the first direction by a certain angle to switch the clutch mechanism 40 to the disengaged state, or the control device controls the self-drive motor 310 to drive the drive shaft 330 to rotate in the second backward direction for a preset time to switch the clutch mechanism 40 to the disengaged state, the above-mentioned elastic device 430 releases energy, so that the main clutch disc 420 quickly disengages from the auxiliary clutch disc 410.

[0059] In the above-mentioned embodiment, the driving force for engaging the main clutch disc 420 with the auxiliary clutch disc 410 comes from the main engagement drive mechanism in response to the rotation of the drive shaft 330; and the driving force for disengaging the main clutch disc 420 from the auxiliary clutch disc 410 comes from the pushing of the vehicle or the flipping of the drive shaft 330, which is not affected by the main engagement drive mechanism.

[0060] In the above embodiment, the main meshing drive mechanism is used to drive the main clutch disc 420 to move toward the auxiliary clutch disc 410 to mesh with the auxiliary clutch disc 410. If the driving force of the main meshing drive mechanism is insufficient due to some factors, the main clutch disc 420 and the auxiliary clutch disc 410 may not mesh, and in severe cases, the vehicle may not be able to drive forward by itself.

[0061] In view of the above problems, in one embodiment of the present invention, Figure 5 As shown, the hand-pushed wheeled vehicle 100 further includes an auxiliary meshing drive mechanism 60, which is arranged on a side of the main clutch disc 420 facing away from the secondary clutch disc 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 disc 420 of the clutch mechanism 40, so that the clutch mechanism 40 is switched to the meshing state. Specifically, when the main clutch disc 420 is disengaged from the secondary clutch disc 410, the movable member 610 of the auxiliary meshing drive mechanism 60 can always act on the main clutch disc 420, but the driving force at this time is insufficient to drive the main clutch disc 420 to move toward the secondary clutch disc 410. When the drive shaft 330 rotates in the first direction, the main meshing drive mechanism plays a role, and drives the main clutch disc 420 to move toward the secondary clutch disc 410 together with the auxiliary meshing drive mechanism 60.

[0062] Since the auxiliary engagement drive mechanism 60 is provided to assist the main engagement drive mechanism, the defect of the main engagement drive mechanism that the engagement drive force provided to the main clutch disc 420 is insufficient, resulting in inadequate engagement, is well compensated, so that the engagement start-up is smoother and the engagement can be well guaranteed.

[0063] The main meshing drive mechanism may act on the main clutch disc 420 synchronously with the auxiliary meshing drive mechanism 60, or slightly later than the auxiliary meshing drive mechanism 60. For example, when the main meshing drive mechanism includes a driving pin 510 disposed on one of the main clutch disc 420 and the drive shaft 330, and a curved surface guide portion 520 disposed on the other of the two, when it is necessary to switch to the self-driving mode, the driving pin 510 and the curved surface guide portion 520 may be spaced on the circumference around the axis of the drive shaft 330, and the main meshing drive mechanism may act on the main clutch disc 420 slightly later than the auxiliary meshing drive mechanism 60.

[0064] In one embodiment, in combination Figure 3 , Figure 5 and Figure 6 As shown, the auxiliary engagement drive mechanism 60 includes a movable member 610 that can move along the axial direction of the drive shaft 330, and a drive structure 620, wherein the drive structure 620 includes an elastic element disposed on the drive shaft 330, and the elastic element 620 is configured to provide a driving force for the movable member 610 to move toward the main clutch disc 420. The elastic element is preferably a spring. Specifically, the movable member 610, the drive structure 620, and the elastic element are all accommodated in the internal cavity of the fixed seat 101.

[0065] The end surface of the movable member 610 facing the main clutch disc 420 is provided with a third meshing portion, which includes a plurality of third meshing teeth 612 of the same specification, and each third meshing tooth 612 has a third meshing surface 6121. The end surface of the main clutch disc 420 facing the movable member 610 is provided with a fourth meshing portion capable of cooperating with the third meshing portion, which includes a plurality of fourth meshing teeth 423 of the same specification, and each fourth meshing tooth 423 has a fourth meshing surface 4231. The third meshing surface 6121 and the fourth meshing surface 4231 are arc-shaped surfaces that cooperate with each other.

[0066] like Figure 5 As shown, the main clutch plate 420 and the auxiliary clutch plate 410 are in meshing state, and in the axial direction of the drive shaft 330, there is a gap between the tooth top of the third meshing tooth 612 close to the fourth meshing tooth 423 and the tooth top of the fourth meshing tooth 423 close to the third meshing tooth 612, and there is a gap between the movable member 610 and the main clutch plate 420. Figure 6 As shown, combined with reference Figure 5, when the main clutch disc 420 and the auxiliary clutch disc 410 are in the disengaged state, in the axial direction of the drive shaft 330, the tooth top of the third meshing tooth 612 overlaps with the tooth top of the fourth meshing tooth 423. That is to say, when the main clutch disc 420 and the auxiliary clutch disc 410 are in the disengaged state, in the axial direction of the drive shaft 330, the distance between the tooth top of the third meshing tooth 612 and the tooth top of the fourth meshing tooth 423 is set to be greater than zero and less than the disengagement stroke of the main clutch disc 420 and the auxiliary clutch disc 410. In the process of the clutch mechanism 40 switching from the meshing 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 drive shaft 330, so that when it is necessary to switch to the meshing state again, the third meshing tooth 612 can quickly cooperate with the fourth meshing tooth 423 to achieve the meshing state.

[0067] The working process of the auxiliary engagement drive mechanism 60 is as follows: Figure 6 As shown, the main clutch disc 420 and the auxiliary clutch disc 410 are in a disengaged state. At this time, the drive shaft 330 cannot transmit the power of the self-driving motor 310 to the wheel 20. When the hand wheel 20 moves forward or backward, the wheel 20 rotates and drives the auxiliary clutch disc 410 to rotate together, so that the main clutch disc 420 moves away from the auxiliary clutch disc 410, and the fourth meshing surface 4231 drives the movable member 610 to move away from the main clutch disc 420 intermittently by acting on the third meshing surface 6121. That is, the movable member 610 continuously moves away from the main clutch disc 420 under the action of the main clutch disc 420, and resets under the action of the elastic element, so that the wheel 20 can be pushed.

[0068] like Figure 5 As shown, when the self-driving motor 310 rotates in the first direction, the main meshing driving mechanism drives the main clutch disc 420 to move toward the secondary clutch disc 410. Under the elastic force of the elastic element, the third meshing surface 6121 of the movable member 610 acts on the fourth meshing surface 4231 to drive the main clutch disc 420 to spiral forward, and the auxiliary meshing driving mechanism 60 provides a starting force for meshing, thereby ensuring that the main clutch disc 420 and the secondary clutch disc 410 are smoothly meshed. When the main clutch disc 420 and the secondary clutch disc 410 are in meshing state, the third meshing surface 6121 of the movable member 610 and the fourth meshing surface 4231 of the main clutch disc 420 abut against each other in the axial direction of the drive shaft 330, and the two abut against each other on the circumference around the axis of the drive shaft 330, thereby also preventing the main clutch disc 420 from accidentally disengaging from the secondary clutch disc 410.

[0069] In another embodiment, the driving structure 620 of the auxiliary engagement driving mechanism 60 includes a second electromagnetic driving member. Specifically, the second electromagnetic driving member provides a driving force for the movable member 610 to act on the main clutch plate 420. Figure 8As shown, the second electromagnetic driving member 80 includes a second energized coil 810 and a second magnet 820, wherein the second energized coil 810 is located on the driving shaft 330, and the second magnet 820 is fixed on the movable member 610, and the magnetic field direction of the second magnet 820 is the same as the magnetic field direction after the second energized coil 810 is energized. After the hand-pushed wheeled vehicle 100 is turned on, the second energized coil 810 remains energized and generates a magnetic field, and the second magnet 820 has a tendency to move away from the energized coil due to the repulsive force of the magnetic field, so that the movable member 610 axially abuts against the main clutch plate 420.

[0070] In this embodiment, after the push wheel vehicle 100 is switched to the push mode, the energized coil can be de-energized, or it can remain energized but the magnetic field force applied to the magnet is smaller than the force when the main clutch disc 420 and the auxiliary clutch disc 410 are disengaged. At this time, the drive shaft 330 cannot transmit the power of the self-driving motor 310 to the wheel 20. When the push wheel 20 moves forward or backward, the wheel 20 rotates and drives the auxiliary clutch disc 410 to rotate together, so that the main clutch disc 420 moves away from the auxiliary clutch disc 410, and the fourth meshing surface 4231 drives the movable part 610 to move intermittently away from the main clutch disc 420 by acting on the third meshing surface 6121.

[0071] Furthermore, the movable member 610 and the fixed seat 101 are configured to be relatively rotatable. When the primary clutch disc 420 moves away from the secondary clutch disc 410, the primary clutch disc 420 may rotate within a small angle, so the movable member 610 and the fixed seat 101 are configured to be relatively rotatable within a small angle, such as 5 degrees, to facilitate the disengagement of the primary clutch disc 420 and the secondary clutch disc 410.

[0072] In summary, the above-mentioned hand-pushed wheeled vehicle 100 is provided with a clutch mechanism 40, and the main clutch disc 420 of the clutch mechanism 40 moves in the axial direction of the drive shaft 330 so that the main clutch disc 420 and the auxiliary clutch disc 410 of the clutch mechanism 40 are engaged and disengaged, so that the self-driving motor 310 can drive the drive shaft 330 to rotate, and the hand-pushed wheeled vehicle 100 moves forward, or the self-driving motor 310 is disengaged from the wheel 20, which reduces the torsional force, reduces energy consumption, facilitates steering, and has good usability. In addition, compared with the prior art, an auxiliary engagement drive mechanism 60 is added to provide an engagement starting force, and also ensure that the main clutch disc 420 and the auxiliary clutch disc 410 can be engaged normally, avoiding the situation where the self-drive does not move forward.

[0073] In the above embodiment, the hand-pushed wheeled vehicle 100 is taken as an example of a hand-pushed lawn mower to introduce the embodiment of the present invention. It should be noted that the hand-pushed wheeled vehicle 100 can also be a hand-pushed snow blower, a hand-pushed sweeper or other hand-pushed wheeled vehicles.

[0074] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A hand-pushed wheeled vehicle comprising: Body; wheels, the wheels being pivotally mounted on the machine body, A driving assembly, comprising a self-driving motor and a driving shaft for transmitting power of the self-driving motor to the outside; A clutch mechanism, connecting the drive shaft and the wheel, the clutch mechanism comprising a secondary clutch disc and a primary clutch disc drivably engaged with or disengaged from the secondary clutch disc; a main meshing drive mechanism for driving the main clutch disc to move toward the auxiliary clutch disc in response to the rotation of the self-drive motor; It is characterized in that it also includes an auxiliary engagement drive mechanism, which is arranged on the side of the main clutch disc facing away from the auxiliary clutch disc; In the process of the main engagement drive mechanism driving the clutch mechanism to switch from the disengaged state to the engaged state, the auxiliary engagement drive mechanism provides a driving force to drive the main clutch disc to move toward the auxiliary clutch disc, so that the main clutch disc and the auxiliary clutch disc are in an engaged state; when the main clutch disc and the auxiliary clutch disc are in an engaged state, there is a gap between the auxiliary engagement drive mechanism and the main clutch disc along the drive shaft; The auxiliary engaging drive mechanism includes a movable part that can move axially along the driving shaft, and a driving structure that provides axial force to the movable part. The movable part is provided with engaging teeth on the side facing the main clutch disk, and the main clutch disk is correspondingly provided with engaging teeth on the side facing the movable part. When the main clutch disk and the auxiliary clutch disk are in a disengaged state, the engaging teeth of the movable part and the engaging teeth of the main clutch disk at least partially overlap along the driving shaft. In the process of switching the clutch mechanism from the disengaged state to the engaged state, the driving structure drives the engaging teeth of the movable part to provide driving force to the engaging teeth of the main clutch disk.

2. The hand-pushed wheeled vehicle according to claim 1, characterized in that: The driving structure includes an elastic element, and the elastic element provides a driving force for causing the movable member to move toward the main clutch disc.

3. The hand-pushed wheeled vehicle according to claim 1, characterized in that: The driving structure includes an electromagnetic driving member, which can provide a magnetic field force acting on the movable member to drive the movable member to abut against the main clutch disc.

4. The hand-pushed wheeled vehicle according to claim 1, characterized in that: The hand-pushed wheeled vehicle also includes a fixed seat fixedly connected to the body, the drive shaft is rotatably transmitted in the fixed seat, the movable part is limited by the fixed seat, and during the process of the clutch mechanism switching from the engaged state to the disengaged state, the movable part can move or rotate along the drive shaft for a certain distance to ensure that the clutch mechanism is disengaged.

5. The hand-pushed wheeled vehicle according to claim 4, characterized in that: The movable member is at least partially accommodated in the inner cavity of the fixing seat.

6. The hand-pushed wheeled vehicle according to claim 1, characterized in that: The main meshing drive mechanism is configured to move toward the secondary clutch plate in response to a rotation speed of the drive shaft being greater than a rotation speed of the wheel, so as to switch the clutch mechanism to the meshing state.

7. The hand-pushed wheeled vehicle according to claim 6, characterized in that: The main meshing drive mechanism includes a driving pin disposed on one of the main clutch disc and the driving shaft, and a curved surface guide portion disposed on the other of the two, wherein the curved surface guide portion is a spiral surface or a spiral groove disposed on the main clutch disc.

8. The hand-pushed wheeled vehicle according to claim 1, characterized in that: The clutch mechanism further comprises an elastic device arranged between the auxiliary clutch disc and the main clutch disc.

9. The hand-pushed wheeled vehicle according to claim 8, characterized in that: The elastic device is a spring.

10. The hand-pushed wheeled vehicle according to claim 1, characterized in that: The hand-pushed wheeled vehicle is a hand-pushed lawn mower, a hand-pushed snow sweeper or a hand-pushed sweeper.

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