Hand push mower

Abstract

The application discloses a hand-push mower, which comprises a machine body, a leveling piece, a machine body height-adjusting piece, a gear shifting plate, a front wheel assembly, a rear wheel assembly and a cutting piece. The rear wheel assembly comprises a rotating shaft and a pair of rear wheels. The two ends of the rotating shaft are connected with the rear wheels. The rotating shaft is connected with the machine body through two assembly points. The connecting line between the two assembly points forms a first axis. The straight line formed by the connecting line between the centers of the pair of rear wheels forms a second axis. The first axis is different from the second axis. The machine body height-adjusting piece drives the rear wheels to rotate with the first axis as the center. The gear shifting plate comprises a main body and a supporting part. The main body is connected with the machine body. The supporting part is provided with the leveling piece, which is used for directly contacting the ground. The rear wheels are tangent to the ground when the machine body is in an upright state. The included angle β between each straight line L formed by the contact point between the leveling piece and the ground and the contact point between the rear wheels and the ground is an acute angle when the machine body height-adjusting piece is in each gear position. The application solves the problem of poor standing stability of the mower in the prior art.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lawn mowers, and particularly relates to a hand-push lawn mower. BACKGROUND

[0002] In the prior art, the lawn mower folds the handlebar through a shift plate, so that the machine body assumes the smallest space, and the shift plate supports the machine body to keep it upright, so that the machine body occupies less space and is convenient to store. This design makes the lawn mower easier to store in a limited space, such as a garage or a tool room. However, with the use of the machine body height adjustment, the user can flexibly adjust the height of the lawn mower to adapt to different lawn conditions and personal preferences, but this also leads to several potential problems:

[0003] When the machine body height adjustment of the lawn mower is adjusted, the center of gravity of the entire device may rise. This change in height makes the lawn mower more likely to lose the balance center of gravity in the vertical or near-vertical storage state, and in the presence of lateral forces or non-uniform external disturbances in its storage area, the probability of displacement and eventually overturning of the upright stored machine body after height adjustment is increased. At the same time, after the machine body is upright, the ground conditions are various and sometimes uneven, and the flatness of the contact position between the shift plate and the ground often varies, resulting in a small actual contact area between the shift plate and the ground. The contact points may not be fully stable, which weakens the support ability of the entire machine. When the machine body height adjustment is adjusted, the center of gravity of the entire device may rise, and when the ground surface has irregular distribution of protrusions or depressions, this effect is further aggravated. In addition, during the production, assembly and use of the lawn mower, the shift plate may be asymmetric on both sides due to manufacturing and assembly errors, or may be vibrated and loosened due to assembly errors if not maintained in time after use. This error will cause imbalance when the shift plate and the rear wheel contact the ground, and the imbalance will cause the machine body to shake. After height adjustment, the imbalance is more obvious with the change of the center of gravity, and this instability increases the risk of tilting or overturning. In addition, this instability further increases the possibility of scratching and wearing the ground.

[0004] Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is the poor standing stability of the lawn mower.

[0006] To solve the above technical problems, according to one aspect of the present application, a hand-push mower is provided, comprising a machine body, a leveling piece, a machine body height adjustment piece, a gear shifting plate, a front wheel assembly, a rear wheel assembly and a cutting piece, the rear wheel assembly comprises a rotating shaft and a pair of rear wheels, the two ends of the rotating shaft are respectively connected to the pair of rear wheels, the rotating shaft is assembled on the machine body, the rotating shaft is connected to the machine body through two assembly points, a straight line where a connecting line between the two assembly points lies constitutes a first axis, a straight line where a connecting line between the centers of the pair of rear wheels lies constitutes a second axis, and the first axis and the second axis are different in axis, the machine body height adjustment piece comprises at least two gears, the machine body height adjustment piece drives the rear wheels to rotate with the first axis as the center to realize height adjustment, the gear shifting plate is used to fold the handlebar of the machine body and keep the machine body upright when the handlebar is in a storage state, the gear shifting plate comprises a main body part and a support part, the main body part is connected to the machine body, the support part is provided with the leveling piece for directly contacting the ground, the rear wheels are tangent to the ground when the machine body is in an upright state, when the machine body height adjustment piece is in the lowest gear, a tangent line of the rear wheel on the side away from the front wheel assembly and passing through a preset point W of the leveling piece is L1, when the machine body height adjustment piece is in the highest gear, a tangent line of the rear wheel on the side away from the front wheel assembly and passing through the preset point W of the leveling piece is L2, and an included angle β between the tangent line L1 and the tangent line L2 is an acute angle. By setting the axes of the rear wheels and the rotating shaft to be different in axis, the machine body height adjustment piece can drive the rear wheels to rotate to realize height adjustment, and the included angle β between the tangent lines L1 and L2 of the rear wheels on the side away from the front wheel assembly and passing through the preset point W of the leveling piece at the lowest gear and the highest gear is an acute angle, so that the machine body has a wide and stable low surface at each gear when it is upright stored to resist small vibrations or external impacts, and the angle relationship between the rear wheels and the support part at each gear changes within a small angle range, the mechanical properties are improved by optimizing the support structure and geometric parameters, the center of gravity fluctuation problem caused by structural changes during mechanical movement is better solved, the equipment can reliably resist even if it encounters complex external factors, the overall anti-toppling performance is improved, and the machine can be more safely and stably vertically stored. In addition, by providing the leveling piece on the support part, the leveling piece can adapt to different terrains and provide the best support for the machine body, cooperate with the coordinated action of the rear wheel position, ensure the standing stability of the machine body at any gear, effectively reduce the ground wear caused by friction, provide additional damping effect, disperse the pressure of the support part, further enhance the stability of the machine body, and eliminate the shaking or overturning risk of the machine body in the upright state.

[0007] Optionally, in at least one gear, at least a part of the leveling piece is in contact with the ground, wherein the hardness of the leveling piece is less than the hardness of the support part. Through the above arrangement, the leveling piece can better adapt to the slight irregular surface, thereby improving the fitting effect of the whole installation of the device with the uneven ground, the imbalance of the shift plate and the rear wheel when in contact with the ground, and the leveling piece can absorb part of the force when subjected to lateral force or non-uniform external interference, thereby reducing the imbalance of the shift plate and the rear wheel when in contact with the ground, and avoiding the scratch and wear of the ground by the shift plate when shaking.

[0008] Optionally, in the upright state, the straight line formed by the contact point of the leveling piece with the ground and the contact point of the rear wheel with the ground is L, and the distance between the intersection of the vertical line passing through the center of gravity of the machine body and the midpoint of the straight line L and the midpoint of the straight line L is less than or equal to ±150mm. Through the above arrangement, the machine body can maintain a good standing state in each gear, eliminating the shaking or overturning risk of the machine body in the upright state, and ensuring that the machine body can have high standing stability in each gear.

[0009] Optionally, the included angle β is less than or equal to 15°. Through the above arrangement, the machine body has as small an angular deviation as possible in each gear, avoiding that the offset angle of the center of gravity of the machine body is too large, and ensuring that the machine body can have high standing stability in each gear.

[0010] Optionally, the size of the rear wheel is the same as that of the front wheel of the front wheel assembly, the rotation angle θ of the rear wheel satisfies: 90°≤θ≤270°, and the distance between the second axis and the first axis is greater than or equal to the vertical distance of the lowest cutting plane of the hand-push mower between the highest gear and the lowest gear of the machine body height adjusting piece; or the size of the rear wheel is greater than or equal to the size of the front wheel of the front wheel assembly, the rotation angle θ of the rear wheel satisfies: 90°<θ<270°, and the distance between the second axis and the first axis is greater than the vertical distance of the lowest cutting plane of the hand-push mower between the highest gear and the lowest gear of the machine body height adjusting piece; wherein the lowest cutting plane is the cutting plane of the cutting piece when cutting in the lowest gear. Through the above arrangement, when the angle relationship between the shift plate and the support part is controlled to float within a small angle range between the gears, the rear wheel is guaranteed to have a smaller rearward offset angle of the center of gravity, and the shift plate has a smaller angle with the ground when the machine body is laid flat, so that the machine body is more compact, the product packaging height is shortened, and the production cost is reduced.

[0011] Optionally, the radius of the rear wheel is greater than the distance between the second axis and the first axis by 20mm.

[0012] Optionally, the support part and the main part are arranged at an included angle. By the above arrangement, the support part and the main part are arranged at an L-shaped bending, and the side of the leveling piece close to the ground is a large surface, thereby having a large contact area and improving the contact stability with the ground.

[0013] Optionally, the support part and the main part are arranged in a same plane or parallel planes. By the above arrangement, the contact area of the shift plate with the ground is reduced, and the contact area of the leveling piece with the ground is also relatively small, thereby reducing the wear on the ground as much as possible.

[0014] Optionally, the main part or the support part is provided with an assembly opening, and the assembly opening is a closed opening or an open opening. By the assembly opening, the connection between the leveling piece and the shift plate is firm.

[0015] Optionally, in the case that the assembly opening is located in the main part, or the assembly opening is located in the support part and the support part and the main part are arranged in a same plane or parallel planes, when the assembly opening is a closed opening, the minimum distance h between the side of the assembly opening close to the ground and the outermost edge of the support part close to the ground in the upright state is greater than 2 mm. By the above arrangement, the assembly opening can not only prevent local stress concentration caused by unreasonable design during assembly and use, but also avoid damage to the overall strength of the support part, thereby ensuring the long-term durability and stability of the support part.

[0016] Optionally, the support part and the main part are arranged at an included angle and the assembly opening is located in the support part, and when the assembly opening is a closed opening, the minimum distance h between the periphery of the assembly opening and the outer periphery of the support part is greater than 2 mm. By the above arrangement, the assembly opening can not only prevent local stress concentration caused by unreasonable design during assembly and use, but also avoid damage to the overall strength of the support part, thereby ensuring the long-term durability and stability of the support part.

[0017] Optionally, the shift plate further comprises a fastener, and the leveling piece is connected and fixed to the support part through the assembly opening and the fastener. By the fastener, the leveling piece can be stably fixed on the support part, thereby avoiding the leveling piece from falling off as much as possible and reducing unnecessary maintenance and replacement.

[0018] Optionally, the main part or the support part is provided with a positioning piece, and the leveling piece is provided with a cooperating piece, and the cooperating piece is clamped with the positioning piece, so that the leveling piece is sleeved on the support part. By the above arrangement, the leveling piece and the support part are connected and fixed by clamping cooperation, thereby improving the connection stability.

[0019] Optionally, the leveling piece has a groove, and a minimum distance between any opposite faces of the leveling piece is less than a thickness of the support portion, so that the leveling piece is sleeved on the support portion; or an inner wall of the groove is provided with a clamping piece, and a minimum distance between any opposite faces of the leveling piece is less than the thickness of the support portion, so that the leveling piece is sleeved on the support portion. Through the above arrangement, the leveling piece is arranged in a U-shaped structure with two sides bent inward, so that the leveling piece can be clamped with the support portion after being sleeved on the support portion, without the need for other fixing structures, which is simple and convenient. Through the arrangement of the clamping piece, the connection firmness of the leveling piece and the support portion can be further improved.

[0020] Optionally, the first end of the leveling piece is sleeved on the support portion, the second end of the leveling piece extends to the main body portion from the support portion, the shift plate further comprises a fastener, and one end or both ends of the leveling piece are connected and fixed with the shift plate through the assembly opening and the fastener. Through the above arrangement, the end of the leveling piece can be firmly connected and fixed with the shift plate, so as to ensure the connection stability.

[0021] Optionally, the fastener comprises a screw, the leveling piece is provided with an assembly hole corresponding to the assembly opening, and the screw passes through the assembly opening and extends into the assembly hole to be connected and fixed with the leveling piece. The screw can be stably connected with the leveling piece, thereby improving the connection stability of the leveling piece and the shift plate.

[0022] Optionally, the leveling piece is provided with a protruding portion, an end of the protruding portion is a clamping end, and the protruding portion is clamped with the support portion through the assembly opening. Through the above arrangement, the clamping end of the protruding portion can be clamped and stopped with the inner side surface of the support portion through the assembly opening, so that the leveling piece and the support portion are connected stably.

[0023] Optionally, the two ends of the leveling piece are respectively provided with a first locking portion and a second locking portion, and at least one of the first locking portion and the second locking portion is locked with the assembly opening. Through the above arrangement, the two ends of the leveling piece can be locked with the shift plate, so as to ensure the connection stability of the leveling piece and the shift plate.

[0024] Optionally, the leveling piece has a groove, so that the leveling piece is sleeved on the support portion, and the two ends of the leveling piece are respectively provided with a via hole corresponding to the assembly opening, and the shift plate further comprises a fastener, and the fastener passes through the two via holes and the assembly opening, so that the leveling piece is connected and fixed with the support portion. Through the connection mode of the fastener and the via hole and the assembly opening, the connection stability of the leveling piece and the support portion can be ensured.

[0025] Optionally, the two ends of the leveling piece are respectively provided with a clamping structure, and the clamping structure is clamped and fixed with the edge of the support portion. Through the above arrangement, the two ends of the leveling piece can be clamped and limited with the support portion, so as to ensure the connection stability of the leveling piece and the support portion.

[0026] Optionally, the leveling piece has a receiving groove and a through hole in communication with the receiving groove, the end of the support part is adaptively received in the receiving groove, the support part is provided with an assembly opening, and the shift plate further comprises a fastener, the fastener being connected and fixed with the support part through the through hole and the assembly opening. Through the connection mode of the fastener, the through hole and the assembly opening, the stability of the connection between the leveling piece and the support part can be ensured.

[0027] Optionally, the support part has a receiving groove and an assembly opening in communication with the receiving groove, the opening of the receiving groove is away from the machine body, the leveling piece is received in the receiving groove, and the shift plate further comprises a fastener, the fastener being connected and fixed with the leveling piece through the assembly opening.

[0028] Optionally, the shift plate is made of a hard material.

[0029] Optionally, the shift plate is made of a metal material.

[0030] Optionally, the leveling piece is made of a soft material.

[0031] Optionally, the soft material is at least one of plastic, silica gel, rubber, Teflon, foam polyurethane, polyurethane elastomer or soft polyurethane. The above-mentioned materials make the leveling piece have wear resistance on the basis of flexibility, ensuring the service life.

[0032] Optionally, the leveling piece is of a solid structure, or a hollow structure, or has a hollow cavity with a plurality of support columns arranged therein. The solid structure ensures sufficient and stable contact of the leveling piece with the ground; the hollow structure can further play a buffering role, enabling the leveling piece to contact the ground more flexibly, and saving the manufacturing cost of the leveling piece; the support columns play a buffering role in the hollow cavity while enabling the gravity of the machine body to be more fully transmitted to the ground, ensuring that the machine body is in full contact with the ground and stably maintained in an upright state.

[0033] Optionally, the support part and the main body part are detachably connected, or the support part and the main body part are integrally formed. Through the integrally formed arrangement, the shift plate can have sufficient structural strength, thereby improving the service life; through the detachable connection arrangement, when the shift plate needs to be replaced and maintained, only the corresponding support part or main body part needs to be replaced, without the need to replace the entire shift plate, thereby facilitating the operation of maintenance personnel and reducing the maintenance cost.

[0034] Optionally, the leveling piece is bonded with the support part. Through the above-mentioned arrangement, the leveling piece can be directly connected and fixed with the support part without the need for other structural components, which is convenient and fast.

[0035] Optionally, the support part is at least one of a single shape of I-shaped, J-shaped, L-shaped, T-shaped, H-shaped, C-shaped or U-shaped, or a combination of shapes. Through the above-mentioned arrangement, the support part can be adapted to different connection modes.

[0036] Optionally, the side of the leveling piece close to the ground is flat, arc, trapezoidal or sharp blade structure. With the above arrangement, the leveling piece can be adapted to different gears of the body height adjusting piece.

[0037] Optionally, the angle between the body and the vertical direction is 0-20° in the upright state.

[0038] Optionally, the leveling piece is in line contact with the ground in any gear when the body is in the upright state. With the above arrangement, the contact area between the leveling piece and the ground can be reduced, and the ground can be avoided as much as possible.

[0039] Optionally, the leveling piece is in surface contact with the ground in any gear when the body is in the upright state. With the above arrangement, the leveling piece has a certain area in contact with the ground in any gear, ensuring the stability of the contact with the ground.

[0040] Optionally, the contact position between the leveling piece and the ground changes with the change of the gear under the action of the body height adjusting piece. With the above arrangement, the leveling piece can provide the best support for the body in any gear, and cooperate with the coordinated action of the rear wheel position to ensure the standing stability of the body in any gear.

[0041] Optionally, the support part and the main part are rotatably connected, and the leveling piece is located on the side of the support part away from the main part. With the support part being rotatably arranged, the leveling piece on the support part can always be in surface contact with the ground under the action of gravity, thereby increasing the contact area between the leveling piece and the ground and improving the contact stability between them.

[0042] According to another aspect of the present application, a hand-push mower is provided, comprising a body, a body height adjusting member, a gear shifting plate, a front wheel assembly, a rear wheel assembly and a cutting member, the rear wheel assembly comprises a rotating shaft and a pair of rear wheels, two ends of the rotating shaft are connected to the pair of rear wheels respectively, the rotating shaft is assembled on the body, the rotating shaft is connected to the body through two assembly points, a straight line where a connecting line between the two assembly points lies forms a first axis, a straight line where a connecting line between the centers of the pair of rear wheels lies forms a second axis, the first axis and the second axis are not coaxial, the body height adjusting member comprises at least two gears, the body height adjusting member drives the rear wheel to rotate with the first axis as the center to realize height adjustment, the gear shifting plate is used to fold a handlebar of the body and keep the body upright when the handlebar is in a storage state, the gear shifting plate comprises a main body and a support part, the main body is connected to the body, the support part is used to directly contact with the ground, the rear wheel is tangent to the ground when the body is in an upright state, a tangent line of the rear wheel passing through a preset point W of the support part and located on a side of the rear wheel away from the front wheel assembly is L1 when the body height adjusting member is in the lowest gear, a tangent line of the rear wheel passing through the preset point W of the support part and located on the side of the rear wheel away from the front wheel assembly is L2 when the body height adjusting member is in the highest gear, an included angle β between the tangent line L1 and the tangent line L2 is an acute angle.

[0043] Optionally, in the upright state, a straight line formed by a contact point of the support part with the ground and a contact point of the rear wheel with the ground is L, a distance between a midpoint of the straight line L and an intersection point of a vertical line where a gravity center of the body lies and the straight line L is less than or equal to ±150 mm. Through the above arrangement, the body can maintain a good standing state in each gear, eliminating the shaking or overturning risk of the body in the upright state, and ensuring that the body can have high standing stability in each gear.

[0044] The included angle β is less than or equal to 15°. Through the above arrangement, the body has as small an angular deviation as possible in each gear, avoiding that the offset angle of the gravity center of the body is too large, and ensuring that the body can have high standing stability in each gear.

[0045] Optionally, the size of the rear wheel is the same as that of the front wheel of the front wheel assembly, the rotation angle of the rear wheel satisfies 90°≤θ≤270°, the distance between the second shaft center and the first shaft center is greater than or equal to the vertical distance of the lowest cutting plane of the hand-push mower between the highest gear and the lowest gear of the body height adjusting member; or the size of the rear wheel is greater than or equal to that of the front wheel of the front wheel assembly, the rotation angle of the rear wheel satisfies 90°<θ<270°, and the distance between the second shaft center and the first shaft center is greater than the vertical distance of the lowest cutting plane of the hand-push mower between the highest gear and the lowest gear of the body height adjusting member; wherein the lowest cutting plane is the cutting plane of the cutting member when cutting at the lowest gear. Through the above setting, when the angle relationship between the rear wheel and the support part between each gear is controlled to float within a small angle range, the rearward shift angle of the center of gravity is smaller, and the angle between the shift plate and the ground when the body is laid flat is smaller, so that the body is more compact, the product packaging height is shortened, and the production cost is reduced.

[0046] Optionally, the radius of the rear wheel is greater than the distance between the second shaft center and the first shaft center by 20 mm.

[0047] The technical scheme provided by the application has the following advantages:

[0048] The hand mower provided by the application comprises a machine body, a leveling piece, a machine body height adjusting piece, a gear shifting plate, a front wheel assembly, a rear wheel assembly and a cutting piece. The rear wheel assembly comprises a rotating shaft and a pair of rear wheels. The two ends of the rotating shaft are connected to the pair of rear wheels respectively. The rotating shaft is assembled on the machine body. The rotating shaft and the machine body are connected through two assembly points. A straight line formed by a line connecting the centers of the rear wheels constitutes a second axis. The first axis and the second axis are different in axis. The machine body height adjusting piece comprises at least two gears. The machine body height adjusting piece drives the rear wheels to rotate with the first axis as the center to realize height adjustment. The gear shifting plate is used to fold the handlebar of the machine body and keep the machine body upright when the handlebar is in the storage state. The gear shifting plate comprises a main body and a support part. The main body is connected to the machine body. The support part is provided with the leveling piece for directly contacting the ground. The rear wheels are tangent to the ground when the machine body is in the upright state. When the machine body height adjusting piece is in the lowest gear, the tangent line of the rear wheel on the side away from the front wheel assembly and passing through the preset point W of the leveling piece is L1. When the machine body height adjusting piece is in the highest gear, the tangent line of the rear wheel on the side away from the front wheel assembly and passing through the preset point W of the leveling piece is L2. The included angle β between the tangent line L1 and the tangent line L2 is an acute angle. In this way, the machine body height adjusting piece can drive the rear wheels to rotate to realize height adjustment by setting the axes of the rear wheels and the rotating shaft to be different in axis. The included angle β between the tangent lines L1 and L2 of the rear wheels on the side away from the front wheel assembly and passing through the preset point W of the leveling piece in the lowest gear and the highest gear is an acute angle, so that the machine body can be stored upright on a wide and stable bottom surface to resist small vibrations or external impacts. The angle relationship between the rear wheels and the support part in each gear changes within a small angle range. The mechanical properties are improved by optimizing the support structure and geometric parameters, so as to better solve the problem of gravity fluctuation caused by structural changes during mechanical movement, to ensure that the equipment can reliably resist complex external factors, to improve the overall anti-toppling performance, and to enable the machine to be stored vertically more safely and stably. In addition, the leveling piece on the support part can adapt to different terrains and provide the best support for the machine body. In cooperation with the coordinated action of the rear wheel position, the standing stability of the machine body in any gear is ensured, the ground wear caused by friction is effectively reduced, additional damping effect is provided, the pressure on the support part is dispersed, the stability of the machine body is further enhanced, the shaking or overturning risk of the machine body in the upright state is eliminated, and the problem of poor standing stability of the mower in the prior art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0050] Figure 1 The structure diagram of the bottom view of the hand mower provided for one embodiment of the present application;

[0051] Figure 2 The structure diagram of one gear of the hand mower in the upright state provided for one embodiment of the present application;

[0052] Figure 3 The structure diagram of the hand mower in the upright state provided for one embodiment of the present application; Figure 2 The local enlarged view of the leveling piece;

[0053] Figure 4 The structure diagram of another gear of the hand mower in the upright state provided for one embodiment of the present application;

[0054] Figure 5 The structure diagram of the connection between the body and the rear wheel assembly provided for one embodiment of the present application;

[0055] Figure 6 The structure diagram of multiple gears of the hand mower provided for one embodiment of the present application;

[0056] Figure 7 The structure diagram of the first gear of the hand mower provided for one embodiment of the present application;

[0057] Figure 8 The structure diagram of the second gear of the hand mower provided for one embodiment of the present application;

[0058] Figure 9 The structure diagram of the third gear of the hand mower provided for one embodiment of the present application;

[0059] Figure 10 The local enlarged view of the support part provided for one embodiment of the present application;

[0060] Figure 11 The local enlarged view of the support part provided for another embodiment of the present application;

[0061] Figure 12 The local enlarged view of the support part provided for another embodiment of the present application;

[0062] Figure 13A partial enlarged view of the support part provided for another embodiment of the present application;

[0063] Figure 14 A partial enlarged view of the support part provided for another embodiment of the present application;

[0064] Figure 15 A partial enlarged view of the support part provided for another embodiment of the present application;

[0065] Figure 16 A partial enlarged view of the support part provided for another embodiment of the present application;

[0066] Figure 17 A schematic view of the assembly opening provided for an embodiment of the present application.

[0067] BRIEF DESCRIPTION OF DRAWINGS

[0068] 10 - body; 20 - leveling piece; 201 - first end; 202 - second end; 21 - groove; 22 - through hole; 23 - protruding part; 24 - clamping block; 25 - clamping piece; 30 - shifting plate; 31 - main body part; 32 - support part; 33 - assembly opening; 40 - front wheel assembly; 50 - rear wheel assembly; 51 - rotating shaft; 52 - rear wheel; 60 - body height adjusting piece; 70 - cutting piece. DETAILED DESCRIPTION

[0069] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The present application will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0070] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0071] In the present application, the orientation words such as "up", "down", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves. Similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above-mentioned orientation words are not used to limit the present application.

[0072] The present application solves the problem of poor standing stability of the mower in the prior art.

[0073] As Figures 1 to 4 , Figures 6 to 9As shown, the lawn mower comprises a body 10, a leveling member 20, a body height adjusting member 60, a shift plate 30, a front wheel assembly 40, a rear wheel assembly 50 and a cutting member 70. The front wheel assembly 40 and the rear wheel assembly 50 are respectively arranged at the front and rear sides of the body 10. It can be understood that the rear side of the body 10 is an operating side, and the rear side of the body 10 is provided with a handle (not shown) for a user to hold and operate the lawn mower. The shift plate 30 is arranged at the rear side of the body 10, and is used to fold the handle of the body 10 and keep the body 10 upright when the handle is in a storage state. When the body 10 is in an upright state, the rear wheels 52 and the shift plate 30 are in contact with the ground to provide support.

[0074] As shown in Figure 5 , the rear wheel assembly 50 comprises a rotating shaft 51 and a pair of rear wheels 52. The two ends of the rotating shaft 51 are respectively connected to the pair of rear wheels 52, the rotating shaft 51 is assembled on the body 10, the rotating shaft 51 is connected to the body 10 through two assembly points, a straight line formed by a line between the two assembly points constitutes a first axis, a straight line formed by a line between the centers of the pair of rear wheels 52 constitutes a second axis, and the first axis and the second axis are different in axis. Specifically, the rotating shaft 51 is similar to a U-shaped structure with two side extending sections, the middle section of the rotating shaft 51 is assembled on the body 10 and serves as a first rotation axis, the two side sections of the rotating shaft 51 are respectively bent inwardly and then outwardly, and then are respectively connected to the rear wheels 52, the two side sections of the rotating shaft 51 are coaxially arranged, thereby forming a second rotation axis, so that the rear wheels 52 rotate around the first axis.

[0075] As shown in Figures 10 to 16 , the shift plate 30 comprises a main body 31 and a support part 32. The main body 31 is connected to the body 10, and the support part 32 is provided with the leveling member 20 described above and is used to directly contact the ground. Specifically, the main body 31 extends away from the rear wheel assembly 50 and towards the rear, and the support part 32 is located at the extended end of the main body 31, so that the shift plate 30 and the rear wheel assembly 50 form a three-corner / four-corner structure supported at two points, thereby ensuring the stability of the body 10 in the upright state.

[0076] In the embodiment, as shown in Figure 2 and Figure 4 , and Figures 5 to 9As shown, the body height adjustment member 60 includes at least 2 gears, providing the mower with the ability to adapt to different terrain and lawn conditions, and the height of the cutting is different at different gears, so as to meet the operation requirements of different cutting heights. The body height adjustment member 60 drives the rear wheel 52 to rotate around the first shaft as the center to realize the height adjustment. When the body 10 is in the upright state, the rear wheel 52 is tangent to the ground, and under the action of the body height adjustment member 60, the contact position between the leveling member 20 and the ground changes with the change of the gear. In at least one gear, at least a part of the leveling member 20 is in contact with the ground. Specifically, as shown in Figure 2 As shown, there is a gear, and the leveling member 20 is in surface contact with the ground; as shown in Figure 4 As shown, there is a gear, and the leveling member 20 is in line contact with the ground. It can be understood that the leveling member 20 is in a plate or block structure, and the posture of the body 10 is different at different gears, so the angle between the leveling member 20 and the ground is different, and the contact with the ground is also different.

[0077] Specifically, as shown in Figure 2 and Figure 4 As shown, in the upright state, the angle a between the body 10 and the vertical direction is 0° to 20°. That is, the posture of the body 10 ranges from vertical to 20° backward at different gears.

[0078] For example, as shown in Figure 2 , the angle a between the body 10 and the vertical direction is 0°, that is, the angle between the body 10 and the ground is 90°, and the side of the shift plate 30 close to the ground is parallel to the ground, so the bottom surface of the leveling member 20 provided on the shift plate 30 is in contact with the ground, that is, in surface contact, which can provide the maximum stability in the static state, balance the weight of the body 10, and reduce local wear and pressure concentration. When the angle between the body 10 and the ground is not 90°, the side of the shift plate 30 close to the ground will not be parallel to the ground, and the edge of the bottom surface of the leveling member 20 on the shift plate 30 will be in contact with the ground, that is, in line contact. Due to the height adjustment of the body height adjustment member 60, the distance between the body 10 parallel to the ground is increased, and after the rear wheel assembly 50 acts as a fulcrum, the leveling member 20 can provide the best stability in different use situations. Of course, when the angle between the body 10 and the ground is other angles, that is, the leveling member 20 is in surface contact with the ground when the body height adjustment member 60 is in other gears, and it is not limited to 90°, which can be selected according to actual needs.

[0079] Further, when the machine body 10 is in an upright state, the leveling piece 20 is in surface contact with the ground at any gear. Specifically, the support part 32 is not a flat structure, but a curved structure, for example, an arc or a polygon, and correspondingly, the leveling piece 20 is also arc-shaped or polygonal, so that the leveling piece 20 has a certain area in contact with the ground at any gear, ensuring the stability of contact with the ground. Of course, by adjusting the angle of the arc or polygon of the support part 32, the leveling piece 20 can also be in line contact with the ground at any gear, thereby reducing the contact area with the ground and avoiding scratching and wearing the ground as much as possible. It can be selected according to actual needs.

[0080] In the present embodiment, as shown in Figures 6 to 9 the tangent line of the rear wheel 52 passing through the preset point W of the leveling piece 20 on the side away from the front wheel assembly 40 is L1 when the machine body height adjusting piece 60 is in the lowest gear, and the tangent line of the rear wheel 52 passing through the preset point W of the leveling piece 20 on the side away from the front wheel assembly 40 is L2 when the machine body height adjusting piece 60 is in the highest gear, and the included angle β between the tangent line L1 and the tangent line L2 is an acute angle. By adopting the technical solution of the present application, the machine body height adjusting piece 60 can drive the rear wheel 52 to rotate to achieve height adjustment by setting the axis of the rear wheel 52 and the shaft 51 to be different, and the included angle β between the tangent lines L1 and L2 of the rear wheel 52 passing through the preset point W of the leveling piece 20 on the side away from the front wheel assembly 40 at the lowest gear and the highest gear is an acute angle, so that the machine body 10 has a wide and stable bottom surface at each gear when it is upright, to resist small vibrations or external impacts, while controlling the change in the angle relationship between the rear wheel 52 and the support part 32 between gears to float within a small angle range, thereby optimizing the support structure and geometric parameters to improve its mechanical properties and better solve the problem of center of gravity fluctuation caused by structural changes during mechanical movement, to ensure that the equipment can reliably resist even complex external factors, improve the overall anti-toppling performance, and enable the machine to be more safely and stably vertically stored.

[0081] It can be understood that the tangent lines L1 and L2 are on the side away from the front wheel assembly 40, that is, on the side close to the leveling piece 20 or the side for contact with the ground in the upright state.

[0082] It should be noted that the preset point W of the leveling piece 20 can be the center of gravity of the leveling piece 20, or a point on the plane on the side close to the ground of the leveling piece 20, or any point on the leveling piece 20, and the purpose is to serve as a reference point to illustrate the included angle change relationship between the tangent lines L1 and L2, so the specific position does not need to be limited.

[0083] Specifically, in this embodiment, the included angle β is less than or equal to 15°. By using the above parameter range, the fuselage 10 has the smallest possible angular deviation in each gear position, avoiding excessive offset of the fuselage 10's center of gravity and ensuring that the fuselage 10 has high standing stability in each gear position.

[0084] Furthermore, in this embodiment, as Figure 6 As shown, in the upright position, the straight line L formed by the contact point between the leveling component 20 and the ground and the contact point between the rear wheel 52 and the ground is called L. The distance between the intersection of the vertical line of the center of gravity of the fuselage 10 and the straight line L and the midpoint of the straight line L is less than or equal to ±150mm. Through the above settings, the fuselage 10 can maintain a good standing position in all gears, eliminating the risk of swaying or tipping in the upright position, and ensuring high standing stability in all gears. It can be understood that the sign of the distance between the intersection of the vertical line of the center of gravity of the fuselage 10 and the straight line L and the midpoint of the straight line L indicates which side of the midpoint of the straight line L the intersection of the vertical line of the center of gravity of the fuselage 10 is located on. For example, in... Figure 6 In the equation, the intersection of the vertical line containing the center of gravity of fuselage 10 and the straight line L is negative if it is to the left of the midpoint of the straight line L, and positive if it is to the right of the midpoint of the straight line L. The value is 0 when the intersection of the vertical line containing the center of gravity of fuselage 10 and the straight line L coincides with the midpoint of the straight line L.

[0085] In this embodiment, as Figures 7 to 9 As shown, the rotation angle θ of the rear wheel 52 ranges from 90° to 270°. It can be understood that the rotation angle θ of the rear wheel 52 is the angle at which the rear wheel 52 rotates clockwise with a reference of 0° to the horizontal line extending from the first axle towards the front wheel assembly 40 on the left. This configuration allows for a wider range of adjustment for the fuselage height adjustment mechanism 60, thus adapting to various application scenarios and terrains.

[0086] In this embodiment, when the size of the rear wheel 52 is the same as the size of the front wheel of the front wheel assembly 40, the rotation angle θ of the rear wheel 52 satisfies: 90°≤θ≤270°. The distance between the second axis and the first axis is greater than or equal to the vertical distance between the lowest cutting plane of the push mower and the highest and lowest settings of the body height adjustment component 60. When the size of the rear wheel 52 is greater than or equal to the size of the front wheel of the front wheel assembly 40, the rotation angle θ of the rear wheel 52 satisfies: 90°<θ<270°. The distance between the second axis and the first axis is greater than the vertical distance between the lowest cutting plane of the push mower and the highest and lowest settings of the body height adjustment component 60. The lowest cutting plane is the cutting plane of the cutting element 70 when cutting at the lowest setting. Understandably, when the size of the rear wheel 52 is the same as the size of the front wheel of the front wheel assembly 40, and the distance between the second axle and the first axle is greater than or equal to the vertical distance between the lowest cutting plane of the push lawnmower and the highest and lowest settings of the body height adjustment component 60, and the rotation angle θ of the rear wheel 52 is 90°, the lowest cutting plane is at its lowest setting from the ground, which is also the lowest setting of the body height adjustment component 60. Figure 7 As shown; when the rotation angle θ of the rear wheel 52 is 270°, the lowest cutting plane is at its highest position above the ground, which is also the highest position of the fuselage height adjustment component 60, as shown. Figure 9 As shown.

[0087] When the size of the rear wheel 52 is greater than the size of the front wheel of the front wheel assembly 40, or when the size of the rear wheel 52 is equal to the size of the front wheel of the front wheel assembly 40, and the distance between the second axle and the first axle is greater than the vertical distance between the lowest cutting plane of the push mower and the highest and lowest settings of the body height adjustment component 60, when the rotation angle θ of the rear wheel 52 is close to 90°, the lowest cutting plane is at the lowest setting from the ground, which is also the lowest setting of the body height adjustment component 60; when the rotation angle θ of the rear wheel 52 is close to 270°, the lowest cutting plane is at the highest setting from the ground, which is also the highest setting of the body height adjustment component 60.

[0088] With the above settings, when the shift plate 30 and rear wheel 52 support the machine body 10 upright, and the angle between the rear wheel 52 and the support part 32 fluctuates within a small angle range between different gear positions, the rearward shift of the center of gravity is smaller, and the angle between the shift plate 30 and the ground is smaller when the machine body 10 is laid flat. This makes the machine body 10 more compact, shortens the product packaging height, and reduces production costs. Furthermore, in this embodiment, the radius of the rear wheel 52 is greater than the distance of 20mm between the second axle center and the first axle center. In other words, the distance between the first axle center and the outer periphery of the rear wheel 52 is 20mm.

[0089] In the embodiment, the hardness of the leveling piece 20 is less than the hardness of the support part 32. That is, the leveling piece 20 is made of a flexible material. By arranging the leveling piece 20 and selecting the flexible material for the leveling piece 20, the leveling piece 20 can adapt to different terrains and provide the best support for the body 10, cooperate with the coordinated action of the position of the rear wheel assembly 50, ensure the standing stability of the body 10 in any gear, effectively reduce the ground wear caused by friction, and provide additional damping effect, disperse the pressure of the support part 32, further enhance the stability of the body 10, eliminate the shaking or overturning risk of the body 10 in the storage state, and in addition, the leveling piece 20 can better adapt to the small irregular surface, thereby improving the fitting effect of the whole device when installed on the uneven ground, the imbalance of the shift plate 30 and the rear wheel 52 when in contact with the ground, and the leveling piece 20 can absorb part of the force when subjected to lateral force or non-uniform external interference, thereby reducing the imbalance of the shift plate 30 and the rear wheel 52 when in contact with the ground, and avoiding scratching and wearing the ground when shaking.

[0090] In the embodiment, the shift plate 30 is made of a hard material. Further, the shift plate 30 is made of a metal material. For example, the shift plate 30 is made of an iron plate, an alloy plate or a stainless steel plate.

[0091] In the embodiment, the leveling piece 20 is made of a soft material. Further, since there is friction between the leveling piece 20 and the ground, the leveling piece 20 needs to have wear resistance on the basis of flexibility to ensure the service life. Specifically, the soft material is at least one of plastic, silicone, rubber, Teflon, foamed polyurethane, polyurethane elastomer or soft polyurethane.

[0092] In the embodiment, the shift plate 30 is one or two, and the shift plate 30 is located at one end or both ends of the rear side of the body 10, so that the body 10 can be stably maintained in the upright state. Correspondingly, the leveling piece 20 is also two.

[0093] In the embodiment, in order to ensure sufficient and stable contact between the leveling piece 20 and the ground, the leveling piece 20 is a solid structure. Of course, the leveling piece 20 can also be a hollow structure. That is, the leveling piece 20 has a hollow cavity filled with air. Through the above arrangement, the hollow cavity can further play a buffering role, so that the leveling piece 20 is more flexible in contact with the ground, and the manufacturing cost of the leveling piece 20 can be saved. Further, a plurality of support columns can be arranged in the hollow cavity, so that the support columns can more fully transmit the gravity of the body 10 to the ground while the hollow cavity plays a buffering role, to ensure that the body 10 is in full contact with the ground, so that the body 10 is stably maintained in the upright state.

[0094] In the embodiment, the support part 32 is integrally formed with the main part 31. Through the above arrangement, the gear shifting plate 30 can have sufficient structural strength, thereby prolonging the service life.

[0095] In an alternative embodiment, the support part 32 is detachably connected with the main part 31. With the above arrangement, when the gear shifting plate 30 needs to be replaced and maintained, only the corresponding support part 32 or main part 31 needs to be replaced, without the need to replace the entire gear shifting plate 30, thereby facilitating the operation of the maintenance personnel and reducing the maintenance cost.

[0096] In an alternative embodiment, the support part 32 is rotatably connected with the main part 31, and the leveling piece 20 is located on the side of the support part 32 away from the main part 31. Specifically, the main part 31 and the support part 32 are respectively provided with rotating holes at the ends close to each other, and the rotating shafts are respectively inserted through the rotating holes of the two parts, so that the support part 32 rotates relative to the main part 31. By arranging the support part 32 in a rotatable manner, the leveling piece 20 on the support part 32 can always be directed towards the ground and in surface contact with the ground under the action of gravity, thereby increasing the contact area of the leveling piece 20 with the ground and improving the contact stability between the leveling piece 20 and the ground.

[0097] In the embodiment, the main part 31 or the support part 32 is provided with a positioning piece, and the leveling piece 20 is provided with a cooperating piece, which is clamped with the positioning piece, so that the leveling piece 20 is sleeved on the support part 32. Specifically, the positioning piece can be a protruding piece, and the cooperating piece is a recessed piece, or the positioning piece is a recessed piece, and the cooperating piece is a protruding piece, so that the leveling piece 20 and the support part 32 are clamped and fixed through the recess and protrusion cooperation, and the clamping between the leveling piece 20 and the support part 32 facilitates the installation and disassembly, and also maintains good connection stability during use.

[0098] In the embodiment, when the gear shifting plate 30 is not provided with the leveling piece 20, the contact part of the support part 32 with the ground is the support surface, and when the gear shifting plate 30 is provided with the leveling piece 20, the area relationship between the leveling piece 20 and the support surface can be greater than, equal to or less than. Specifically, when the area of the leveling piece 20 is less than the support surface, the leveling piece 20 is located at the middle position of the support part 32, so as to ensure the contact stability. Of course, the leveling piece 20 can also be adapted to the support surface, i.e. the areas are equal, so as to more fully contact with the ground; further, the area of the leveling piece 20 can also be greater than the support surface, i.e. the edge of the leveling piece 20 exceeds the edge of the support surface, so as to further improve the contact stability with the ground. The above manner can be selected according to actual needs.

[0099] In an alternative embodiment, the lawn mower can not include the leveling member 20. Specifically, the lawn mower includes the body 10, the body height adjustment member 60, the shift plate 30, the front wheel assembly 40, the rear wheel assembly 50, and the cutting member 70. The rear wheel assembly 50 includes the rotation shaft 51 and the pair of rear wheels 52, the rotation shaft 51 has two ends respectively connected to the pair of rear wheels 52, the rotation shaft 51 is assembled on the body 10, the rotation shaft 51 is connected to the body 10 through two assembly points, a straight line where a connecting line between the two assembly points lies forms a first axis, a straight line where a connecting line between the centers of the pair of rear wheels 52 lies forms a second axis, the first axis and the second axis are not coaxial, the body height adjustment member 60 includes at least two gears, the body height adjustment member 60 drives the rear wheel 52 to rotate with the first axis as the center to achieve height adjustment, the shift plate 30 is used to fold the handlebar of the body 10 and keep the body 10 upright when the handlebar is in the storage state, the shift plate 30 includes the main body part 31 and the support part 32, the main body part 31 is connected to the body 10, the support part 32 is used to directly contact the ground, the rear wheel 52 is tangent to the ground when the body 10 is in the upright state, a tangent line of the rear wheel 52 passing through a preset point W of the support part 32 and located on a side of the rear wheel 52 away from the front wheel assembly 40 is L1 when the body height adjustment member 60 is in the lowest gear, a tangent line of the rear wheel 52 passing through the preset point W of the support part 32 and located on the side of the rear wheel 52 away from the front wheel assembly 40 is L2 when the body height adjustment member 60 is in the highest gear, and an included angle β between the tangent line L1 and the tangent line L2 is an acute angle.

[0100] Further, when the leveling member 20 is not included, a straight line formed by a contact point of the support part 32 with the ground and a contact point of the rear wheel 52 with the ground is L, a distance between an intersection of a vertical line where a gravity center of the body 10 lies and the straight line L and a midpoint of the straight line L is less than or equal to ±150 mm.

[0101] The specific structure of the shift plate 30 and the leveling member 20 will be described below.

[0102] Embodiment One

[0103] In this embodiment, the support part 32 is arranged at an angle with the main body part 31. That is, the support part 32 is arranged in an L-shaped bending manner with the main body part 31. In this way, the leveling member 20 arranged on the support part 32 has a large side close to the ground, thereby having a large contact area and improving the contact stability with the ground.

[0104] Specifically, the support part 32 and the main body part 31 form an included angle of 90°, wherein the main body part 31 is vertically arranged, and the support part 32 is inwardly bent. With the above arrangement, the leveling piece 20 arranged on the support part 32 can have a maximum contact area with the ground, and the inward bending can save space and prevent the support part 32 from exceeding the width of the machine body 10. Of course, the included angle between the support part 32 and the main body part 31 can also be other angles, and the support part 32 can also be outwardly bent, which can be selected according to actual needs.

[0105] As shown in Figure 10 , the two ends of the leveling piece 20 are respectively provided with buckle structures, and the buckle structures are clamped and fixed with the edges of the support part 32. Specifically, the leveling piece 20 has a groove 21, and for the purpose of Figure 10 , the inner walls on the upper and lower sides of the groove 21 are provided with clamping blocks 24, and the clamping blocks 24 and the groove bottom have a space therebetween. The support part 32 is accommodated in the space between the clamping blocks 24 and the groove bottom in the groove 21, and is limited by the clamping blocks 24 through the clamping of the upper and lower edges of the support part 32. Further, the end of the support part 32 away from the main body part 31 has a limiting section, which is L-shaped and bent, so as to limit and stop the leveling piece 20, preventing the leveling piece 20 from being separated from the end of the support part 32.

[0106] In an optional embodiment, similar to the arrangement in Figure 10 , the leveling piece 20 has a groove 21, and the groove 21 extends along the horizontal direction in Figure 10 . The minimum distance between any opposite faces in the leveling piece 20 is less than the thickness of the support part 32, so that the leveling piece 20 is sleeved on the support part 32. It should be noted that in Figure 10 , the thickness of the support part 32 is the size in the upward and downward directions. The leveling piece 20 in this embodiment is arranged in a U-shaped structure with both sides inwardly bent, so as to be clamped with the support part 32 after being sleeved on the support part 32, without the need for other fixing structures, which is simple and convenient. Further, the inner wall of the groove 21 can also be provided with a clamping piece, so that the leveling piece 20 is sleeved on the support part 32. By arranging the clamping piece, the connection firmness of the leveling piece 20 and the support part 32 can be further improved.

[0107] Further, as shown in Figure 3 , Figures 11 to 16 , in order to ensure the firm connection between the leveling piece 20 and the shift plate 30, the main body part 31 or the support part 32 is provided with an assembly opening 33, and the assembly opening 33 is a closed opening.

[0108] Further, the shift plate 30 further comprises a fastener, and the leveling piece 20 is connected and fixed with the support part 32 through the assembly opening 33 and the fastener. Through the connection and assembly of the fastener and the assembly opening, the leveling piece 20 can be stably fixed on the support part 32, and the leveling piece 20 is avoided from falling off as much as possible, and unnecessary maintenance and replacement are reduced.

[0109] In the embodiment, the fastener comprises a screw, and the leveling piece 20 is provided with an assembly hole corresponding to the assembly opening 33, and the screw passes through the assembly opening 33 and extends into the assembly hole to be connected and fixed with the leveling piece 20. Specifically, the assembly hole can be a threaded hole, so that the screw is threadedly connected with the leveling piece 20. Of course, the fastener can also be other types of structures such as a rivet, etc., which can be selected according to actual needs.

[0110] In an optional embodiment, as shown in Figure 17 the assembly opening 33 is an opening. It can be understood that the closed opening is an opening that is not communicated with the edge of the component where the assembly opening 33 is located, and the opening is an opening that is communicated with the edge of the component where the assembly opening 33 is located.

[0111] In the embodiment, as shown in Figure 12 when the assembly opening 33 is located on the support part 32, the minimum distance h between the peripheral edge of the assembly opening 33 and the outer peripheral edge of the support part 32 is greater than 2 mm. Through the above setting, the assembly opening 33 will not affect the structural strength of the support part 32 itself, and the service life of the support part 32 is guaranteed.

[0112] In an optional embodiment, as shown in Figure 12 the first end 201 of the leveling piece 20 is sleeved on the support part 32, the second end 202 of the leveling piece 20 extends to the main body part 31 from the support part 32, and the second end 202 of the leveling piece 20 is connected and fixed with the shift plate 30 through the assembly opening 33 and the fastener. Specifically, the first end of the leveling piece 20 and the support part 32 is an end away from the main body part 31, the assembly opening 33 is arranged on the support part 32 and located at a position close to the second end of the support part 32. The leveling piece 20 is L-shaped, the first end 201 of the leveling piece 20 has a sleeving port matched with the support part 32, so that the extension end of the support part 32 is sleeved on the first end 201 of the leveling piece 20, the second end 202 of the leveling piece 20 is flush with the bent surface of the main body part 31 and the support part 32 or exceeds the bent surface of the main body part 31 and the support part 32 by a part, and then the fastener passes through the assembly opening 33 to be connected with the leveling piece 20 to realize the connection and fixation.

[0113] In an optional embodiment, as shown in Figure 11As shown, the assembly opening 33 is arranged on the main body 31, the leveling piece 20 is U-shaped, the first end 201 of the leveling piece 20 has a sleeve interface matched with the supporting part 32, so that the extending end of the supporting part 32 is arranged through the first end of the leveling piece 20, the second end 202 of the leveling piece 20 is attached to the main body 31, and then the fastener is connected and fixed with the leveling piece 20 through the assembly opening 33. In this embodiment, the second end 202 of the leveling piece 20 also has a through hole 22, so that the fastener passes through the assembly opening 33 and the through hole 22 in sequence, and the connection and fixation of the leveling piece 20 and the main body 31 is realized.

[0114] In an optional embodiment, different from the structure in Figure 11 , the first end of the supporting part 32 has a limiting section, the limiting section is arranged in an L-shaped bending manner, the first end of the supporting part 32 is also provided with an assembly opening 33, the first end of the leveling piece 20 is also provided with a through hole 22, and the fastener is two, the two fasteners pass through the two through holes 22 and the assembly opening 33 respectively, so as to connect and fix the leveling piece 20 and the supporting part 32.

[0115] It should be noted that the assembly opening 33 and the through hole 22 described above can also be multiple at the same position to improve the connection firmness.

[0116] In an optional embodiment, as shown in Figure 14 , the leveling piece 20 is provided with a protruding part 23, the end of the protruding part 23 is a clamping end, and the protruding part 23 is clamped with the supporting part 32 through the assembly opening 33. Specifically, the assembly opening 33 is arranged on the supporting part 32, the protruding part is arranged on the side of the leveling piece 20 close to the supporting part 32, and corresponds to the assembly opening 33, and the clamping end of the protruding part 23 is clamped and stopped with the supporting part 32 after passing through the assembly opening 33. Further, the protruding part 23 can be one or more, when the protruding part 23 is one, the protruding part 23 is located at the middle position of the leveling piece 20, when the protruding part 23 is multiple, the assembly opening 33 is also multiple, and the multiple protruding parts 23 are arranged uniformly on the leveling piece 20 to improve the connection firmness.

[0117] In an optional embodiment, the supporting part 32 has a receiving groove and an assembly opening 33, the assembly opening 33 communicates with the receiving groove, the opening of the receiving groove is away from the fuselage 10, the leveling piece 20 is arranged in the receiving groove, and the fastener is connected and fixed with the leveling piece 20 through the assembly opening 33. Specifically, the supporting part 32 is U-shaped, thereby forming the receiving groove, the size of the leveling piece 20 is matched with the receiving groove, so that the leveling piece 20 is just arranged in the receiving groove, and then the supporting part 32 is connected and fixed with the leveling piece 20 through the fastener. Of course, the supporting part 32 can also have the assembly opening 33, the leveling piece 20 can have the receiving groove, the supporting part 32 can have a clamping protrusion matched with the receiving groove, the clamping protrusion is matched and arranged in the receiving groove, and then the supporting part 32 is connected and fixed with the leveling piece 20 through the fastener.

[0118] In an optional embodiment, the leveling piece 20 has a first locking portion and a second locking portion at two ends respectively, and at least one of the first locking portion and the second locking portion is locked with the assembly opening 33. Specifically, the assembly opening 33 is arranged on the main body portion 31, and the first locking portion at the second end of the leveling piece 20 is locked with the assembly opening 33 on the main body portion 31. Further, the first end of the support portion 32 can also be provided with the assembly opening 33, so that the first locking portion is locked with the assembly opening 33 on the support portion 32, thereby further improving the connection firmness of the leveling piece 20 and the support portion 32.

[0119] Further, in addition to the connection mode by the assembly opening 33 and the fastener, the leveling piece 20 can also be bonded with the support portion 32. In this way, the leveling piece 20 can be directly connected and fixed with the support portion 32 without other structural components, which is convenient and fast.

[0120] In the embodiment, the support portion 32 can be at least one single shape or a combination shape of I shape, J shape, L shape, T shape, W shape, C shape, and U shape, which can be selected according to actual needs.

[0121] In the embodiment, the side of the leveling piece 20 close to the ground is a plane, an arc surface, a trapezoidal surface, or a sharp blade structure.

[0122] Embodiment Two

[0123] In the embodiment, the difference from the embodiment one is that the structural forms of the main body portion 31 and the support portion 32 are different.

[0124] Specifically, in the embodiment, the support portion 32 and the main body portion 31 are arranged in a same plane or parallel planes. That is, the support portion 32 and the main body portion 31 are both arranged vertically. By using the above arrangement, the contact area of the shift plate 30 with the ground can be reduced, and the contact area of the leveling piece 20 with the ground is also relatively small, thereby reducing the wear on the ground as much as possible.

[0125] In the embodiment, as shown in Figure 3 When the assembly opening 33 is a closed opening, the minimum distance h between the side of the assembly opening 33 close to the ground and the outermost edge of the support portion 32 close to the ground in the upright state is greater than 2 mm. Specifically, the edge of the support portion 32 is not a regular straight line, but a curve or an arc with continuous bending sections, so the distance between the assembly opening 33 and the outermost edge of the support portion 32 is different at different positions. By the above arrangement, the assembly opening 33 does not affect the structural strength of the support portion 32 itself, and the service life of the support portion 32 is guaranteed.

[0126] As shown in Figure 15 The leveling piece 20 has a groove 21, and the groove 21 is arranged along Figure 15The vertical direction of the leveling piece 20 extends in the vertical direction of the support part 32, and the minimum distance between any two opposite faces of the leveling piece 20 is less than the thickness of the support part 32, so that the leveling piece 20 is sleeved on the support part 32. Figure 15 In the embodiment, the thickness of the support part 32 is the horizontal dimension. The leveling piece 20 in the embodiment is in a U-shaped structure with the two sides bent inward, so that the leveling piece 20 can be clamped with the support part 32 after being sleeved on the support part 32, without other fixing structures, which is simple and convenient.

[0127] Further, as shown in Figure 16 , a clamping piece 25 can also be arranged on the inner wall of the groove 21 to make the leveling piece 20 sleeved on the support part 32. By arranging the clamping piece 25, the connection firmness of the leveling piece 20 and the support part 32 can be further improved.

[0128] In an alternative embodiment, as shown in Figure 15 , the leveling piece 20 has a groove 21 to make the leveling piece 20 sleeved on the support part 32, and the two ends of the leveling piece 20 are respectively provided with through holes 22 corresponding to the assembly opening 33, and the fastener passes through the two through holes 22 and the assembly opening 33 to connect and fix the leveling piece 20 and the support part 32.

[0129] In an alternative embodiment, the first end of the leveling piece 20 is sleeved on the support part 32, the second end of the leveling piece 20 extends from the support part 32 to the main body part 31, and one end or both ends of the leveling piece 20 are connected and fixed with the main body part 31 through the assembly opening 33 and the fastener. Specifically, the first end of the leveling piece 20 and the support part 32 is the end away from the main body part 31, and the assembly opening 33 is arranged on the support part 32 or the main body part 31, depending on the length of the leveling piece 20. The leveling piece 20 is in an L shape, the first end of the leveling piece 20 has a sleeving interface matched with the support part 32, so that the extended end of the support part 32 is arranged in the first end of the leveling piece 20, and then the second end of the leveling piece 20 is connected and fixed with the support part 32 or the main body part 31 through the fastener passing through the assembly opening 33.

[0130] In an alternative embodiment, a protruding part is arranged on the leveling piece 20, the end of the protruding part is a clamping end, and the protruding part is clamped with the support part 32 through the assembly opening 33. Specifically, the assembly opening 33 is arranged on the support part 32 or the main body part 31, the protruding part is arranged on the side of the leveling piece 20 close to the shift plate 30 and corresponds to the assembly opening 33, and the clamping end of the protruding part is clamped and stopped with the shift plate 30 after passing through the assembly opening 33. Further, the protruding part can be one or more, when the protruding part is one, the protruding part is arranged at the middle position of the leveling piece 20, and when the protruding part is more than one, the assembly opening 33 is also more than one, and the plurality of protruding parts are arranged uniformly on the leveling piece 20 to improve the connection firmness.

[0131] In an alternative embodiment, the leveling piece 20 has a receiving groove and a through hole 22, the through hole 22 is in communication with the receiving groove, the end of the support part 32 is adaptively received in the receiving groove, the support part 32 is provided with an assembly opening 33, the shift plate 30 further comprises a fastener, the fastener is connected and fixed with the support part 32 through the through hole 22 and the assembly opening 33. Specifically, the leveling piece 20 is a U-shaped structure, thereby forming the receiving groove, the size of the end of the support part 32 is adapted to the receiving groove, thereby being exactly received in the receiving groove, and then being connected and fixed with the leveling piece 20 through the fastener. Of course, the end of the support part 32 can also be a U-shaped structure, thereby forming the receiving groove, the opening of the receiving groove is away from the fuselage 10, the leveling piece 20 is received in the receiving groove, and the fastener is connected and fixed with the leveling piece 20 through the assembly opening 33.

[0132] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: the hand-push mower comprises a machine body 10, a leveling piece 20, a machine body height adjustment piece 60, a shift plate 30, a front wheel assembly 40, a rear wheel assembly 50, and a cutting piece 70. The rear wheel assembly 50 comprises a rotating shaft 51 and a pair of rear wheels 52. The two ends of the rotating shaft 51 are respectively connected to the pair of rear wheels 52. The rotating shaft 51 is assembled on the machine body 10. The rotating shaft 51 is connected to the machine body 10 through two assembly points. A straight line formed by a connecting line between the two assembly points constitutes a first axis. A straight line formed by a connecting line between the centers of the rear wheels 52 constitutes a second axis. The first axis and the second axis are different in axis. The machine body height adjustment piece 60 comprises at least two gears. The machine body height adjustment piece 60 drives the rear wheel 52 to rotate with the first axis as the center to achieve height adjustment. The shift plate 30 is used to fold the handlebar of the machine body 10 and keep the machine body 10 upright when the handlebar is in the storage state. The shift plate 30 comprises a main body part 31 and a support part 32. The main body part 31 is connected to the machine body 10. The support part 32 is provided with the leveling piece 20 for direct contact with the ground. The rear wheel assembly 50 is tangent to the ground when the machine body 10 is in the upright state. The included angle β between each straight line L formed by the contact points of the leveling piece 20 and the ground and the contact points of the rear wheel 52 and the ground at each gear of the machine body height adjustment piece 60 is an acute angle. By setting the axes of the rear wheel 52 and the rotating shaft 51 to be different, the machine body height adjustment piece 60 can drive the rear wheel 52 to rotate to achieve height adjustment. The included angle β between each straight line L formed by the contact points of the leveling piece 20 and the ground and the contact points of the rear wheel 52 and the ground at each gear is an acute angle, so that the machine body 10 has a wide and stable surface at each gear when it is upright and stored, to resist small vibrations or external impacts. At the same time, the change in the angle relationship between the rear wheel 52 and the support part 32 at each gear is floating within a small angle range. By optimizing the support structure and geometric parameters, the mechanical properties are improved, the problem of center of gravity fluctuation caused by structural changes during mechanical movement is better solved, the equipment can reliably resist even in complex external factors, the overall anti-toppling performance is improved, the machine can be stored vertically more safely and stably. In addition, by providing the leveling piece 20 on the support part 32, the leveling piece 20 can adapt to different terrains and provide the best support for the machine body 10. In cooperation with the coordinated action of the position of the rear wheel assembly 50, the standing stability of the machine body 10 at any gear is ensured, and the ground wear caused by friction is effectively reduced. It also provides additional shock absorption effect, disperses the pressure of the support part 32, further enhances the stability of the machine body 10, and eliminates the shaking or overturning risk of the machine body 10 in the storage state.

[0133] Obviously, the above described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other different forms of changes or variations can be made by those skilled in the art without making any creative labor, and all should belong to the protection scope of the present application.

Claims

1. A walk-behind grass trimmer characterized by comprising: The mower comprises a body (10), a leveling member (20), a body height adjusting member (60), a gear shifting plate (30), a front wheel assembly (40), a rear wheel assembly (50) and a cutting member (70). The rear wheel assembly (50) comprises a rotating shaft (51) and a pair of rear wheels (52). The rotating shaft (51) is connected to the pair of rear wheels (52) at two ends thereof. The rotating shaft (51) is assembled on the body (10) and connected to the body (10) through two assembly points. A straight line formed by a line connecting the two assembly points constitutes a first axis. A straight line formed by a line connecting the centers of the pair of rear wheels (52) constitutes a second axis. The first axis is different from the second axis. The body height adjusting member (60) comprises at least two gears. The body height adjusting member (60) drives the rear wheel (52) to rotate around the first axis to adjust the height. The gear shifting plate (30) is used to fold a handle of the body (10) and keep the body (10) upright when the handle is in a storage state. The gear shifting plate (30) comprises a main body (31) and a support (32). The main body (31) is connected to the body (10). The support (32) is provided with the leveling member (20) and used to directly contact the ground. The rear wheel (52) is tangent to the ground when the body (10) is in an upright state. A tangent line of the rear wheel (52) passing through a preset point W of the leveling member (20) on a side of the rear wheel (52) away from the front wheel assembly (40) is L1 when the body height adjusting member (60) is in a lowest gear. A tangent line of the rear wheel (52) passing through the preset point W of the leveling member (20) on the side of the rear wheel (52) away from the front wheel assembly (40) is L2 when the body height adjusting member (60) is in a highest gear. An included angle β between the tangent line L1 and the tangent line L2 is an acute angle.

2. The walk-behind grass trimmer according to claim 1, characterized by In at least one gear, at least a part of the leveling member (20) contacts the ground. The hardness of the leveling member (20) is less than the hardness of the support (32).

3. The walk-behind grass trimmer according to claim 1, characterized by In the upright state, a straight line formed by a contact point of the leveling member (20) with the ground and a contact point of the rear wheel (52) with the ground is L. The distance between a midpoint of the straight line L and an intersection point of a vertical line passing through a gravity center of the body (10) and the straight line L is less than or equal to ±150 mm.

4. The walk-behind grass trimmer according to claim 1, characterized by The included angle β is less than or equal to 15°.

5. The mower according to claim 1, wherein The size of the rear wheel (52) is the same as that of a front wheel of the front wheel assembly (40). A rotation angle θ of the rear wheel (52) satisfies 90°≤θ≤270°. The distance between the second axis and the first axis is greater than or equal to a vertical distance of a lowest cutting plane of the mower between the highest gear and the lowest gear of the body height adjusting member (60); or The size of the rear wheel (52) is greater than or equal to the size of the front wheel of the front wheel assembly (40), the rotation angle θ of the rear wheel (52) satisfies: 90°<θ<270°, and the distance between the second shaft center and the first shaft center is greater than the vertical distance of the lowest cutting plane of the hand-propelled mower between the highest gear and the lowest gear of the body height adjustment member (60). The lowest cutting plane is the cutting plane of the cutting member (70) when cutting at the lowest gear.

6. The walk-behind grass trimmer according to claim 1, characterized by The radius of the rear wheel (52) is greater than the distance between the second shaft center and the first shaft center by 20 mm.

7. The walk-behind grass trimmer according to claim 1, characterized by The support part (32) and the main body part (31) are arranged at an included angle.

8. The walk-behind grass trimmer according to claim 1, characterized by The support part (32) and the main body part (31) are arranged in the same plane or parallel planes.

9. The walk-behind grass trimmer according to claim 7 or 8, characterized in that, The main body part (31) or the support part (32) is provided with an assembly opening (33), which is a closed opening or an open opening.

10. The walk-behind grass trimmer according to claim 9, characterized by When the assembly opening (33) is located in the main body part (31), or the assembly opening (33) is located in the support part (32) and the support part (32) and the main body part (31) are arranged in the same plane or parallel planes, and the assembly opening (33) is a closed opening, the minimum distance h between the side of the assembly opening (33) close to the ground and the outermost edge of the support part (32) close to the ground in the upright state is greater than 2 mm.

11. The walk-behind grass trimmer according to claim 9, characterized by When the assembly opening (33) is located in the support part (32) and the assembly opening (33) is a closed opening, the minimum distance h between the peripheral edge of the assembly opening (33) and the outer peripheral edge of the support part (32) is greater than 2 mm.

12. The walk-behind grass trimmer according to claim 9, characterized by The gear shifting plate (30) further comprises a fastener, and the leveling member (20) is connected and fixed with the support part (32) through the assembly opening (33) and the fastener.

13. The walk-behind grass trimmer according to claim 7 or 8, characterized by The main body part (31) or the support part (32) is provided with a positioning member, and the leveling member (20) is provided with a cooperating member which is clamped with the positioning member so that the leveling member (20) is sleeved on the support part (32).

14. The walk-behind grass trimmer according to claim 7 or 8, characterized by The leveling member (20) has a groove (21), The minimum distance of any opposite surface in the leveling member (20) is less than the thickness of the support part (32) so that the leveling member (20) is sleeved on the support part (32); or The inner wall of the groove (21) is provided with a clamping member (25), and the minimum distance of any opposite surface of the leveling member (20) is less than the thickness of the support part (32) so that the leveling member (20) is sleeved on the support part (32).

15. The walk-behind grass trimmer of claim 9, wherein, The first end of the leveling member (20) is sleeved on the support part (32), the second end of the leveling member (20) is extended from the support part (32) to the main body part (31), the gear shifting plate (30) further comprises a fastener, and one end or both ends of the leveling member (20) are connected and fixed with the gear shifting plate (30) through the assembly opening (33) and the fastener.

16. The walk-behind grass trimmer of claim 15, wherein, The fastener comprises a screw, the leveling piece (20) is provided with an assembly hole corresponding to the assembly opening (33), the screw passes through the assembly opening (33) and extends into the assembly hole to be connected and fixed with the leveling piece (20).

17. The walk-behind grass trimmer of claim 9, wherein, The leveling piece (20) is provided with a protruding part (23), the end of the protruding part (23) is a clamping end, and the protruding part (23) is clamped with the support part (32) through the assembly opening (33).

18. The walk-behind grass trimmer of claim 9, wherein, The two ends of the leveling piece (20) are respectively provided with a first locking part and a second locking part, and at least one of the first locking part and the second locking part is locked with the assembly opening (33).

19. The walk-behind grass trimmer of claim 9, wherein, The leveling piece (20) is provided with a groove (21) so that the leveling piece (20) is sleeved on the support part (32), the two ends of the leveling piece (20) are respectively provided with a via hole (22) corresponding to the assembly opening (33), and the gear shifting plate (30) further comprises a fastener, the fastener passes through the two via holes (22) and the assembly opening (33) to connect and fix the leveling piece (20) and the support part (32).

20. The walk-behind grass trimmer of claim 7, wherein, The two ends of the leveling piece (20) are respectively provided with a buckle structure, and the buckle structure is clamped and fixed with the edge of the support part (32).

21. The walk-behind grass trimmer of claim 8, wherein, The leveling piece (20) is provided with a receiving groove and a via hole (22), the via hole (22) is communicated with the receiving groove, the end of the support part (32) is adaptively received in the receiving groove, the support part (32) is provided with an assembly opening (33), and the gear shifting plate (30) further comprises a fastener, the fastener passes through the via hole (22) and the assembly opening (33) to connect and fix the support part (32).

22. The walk-behind grass trimmer according to claim 9, characterized by The support part (32) is provided with a receiving groove and the assembly opening (33), the assembly opening (33) is communicated with the receiving groove, the opening of the receiving groove is away from the fuselage (10), the leveling piece (20) is received in the receiving groove, and the gear shifting plate (30) further comprises a fastener, the fastener passes through the assembly opening (33) to connect and fix the leveling piece (20).

23. The walk-behind grass trimmer according to any one of claims 6 to 8, characterized by, The gear shifting plate (30) is made of a hard material.

24. The walk-behind grass trimmer of claim 23, wherein, The gear shifting plate (30) is made of a metal material.

25. The walk-behind grass trimmer according to any one of claims 6 to 8, characterized by, The leveling piece (20) is made of a soft material.

26. The walk-behind grass trimmer of claim 25, wherein, The soft material is at least one of plastic, silica gel, rubber, Teflon, foam polyurethane, polyurethane elastomer or soft polyurethane.

27. The walk-behind grass trimmer according to any one of claims 6 to 8, wherein The leveling piece (20) is a solid structure; or The leveling piece (20) is a hollow structure; or The leveling piece (20) has a hollow cavity, and a plurality of support columns are arranged in the hollow cavity.

28. The walk-behind grass trimmer according to any one of claims 6 to 8, wherein The support part (32) is detachably connected with the main body part (31); or The support part (32) is integrally formed with the main body part (31).

29. The walk-behind grass trimmer according to any one of claims 6 to 8, characterized by, The leveling piece (20) is adhesively connected with the support part (32).

30. The walk-behind grass trimmer according to any one of claims 6 to 8, characterized by, The support part (32) is at least one single shape or combined shape of I shape, J shape, L shape, T shape, H shape, C shape or U shape.

31. The walk-behind grass trimmer according to any one of claims 6 to 8, characterized by, The side of the leveling piece (20) close to the ground is a plane, an arc surface, a trapezoidal surface or a sharp blade structure.

32. The walk-behind grass trimmer of claim 1, wherein, In the upright state, the angle α between the fuselage (10) and the vertical direction is 0°-20°.

33. The walk-behind grass trimmer of claim 1, wherein, In the upright state of the fuselage (10), the leveling piece (20) is in line contact with the ground at any gear.

34. The walk-behind grass trimmer of claim 1, wherein, In the upright state of the fuselage (10), the leveling piece (20) is in surface contact with the ground at any gear.

35. The walk-behind grass trimmer of claim 1, wherein, Under the action of the fuselage height adjusting piece, the contact position between the leveling piece (20) and the ground changes with the change of the gear.

36. The walk-behind grass trimmer of claim 1, wherein, The support part (32) is rotatably connected with the main body part (31), and the leveling piece (20) is located on the side of the support part (32) away from the main body part (31).

37. A walk-behind grass trimmer comprising: The rear wheel assembly (50) comprises a rotating shaft (51) and a pair of rear wheels (52), the two ends of the rotating shaft (51) are respectively connected with the pair of rear wheels (52), the rotating shaft (51) is assembled on the fuselage (10), the rotating shaft (51) and the fuselage (10) are connected through two assembly points, a straight line where a connecting line between the two assembly points is located constitutes a first axis, a straight line where a connecting line between the centers of the pair of rear wheels (52) is located constitutes a second axis, the first axis and the second axis are different in axis, the fuselage height adjusting piece (60) comprises at least two gears, the fuselage height adjusting piece (60) drives the rear wheels (52) to rotate with the first axis as the center to realize height adjustment, the gear shifting plate (30) is used for folding a handlebar of the fuselage (10) and keeping the fuselage (10) upright when the handlebar is in a storage state, the gear shifting plate (30) comprises a main body part (31) and a support part (32), the main body part (31) is connected with the fuselage (10), the support part (32) is used for directly contacting with the ground, the rear wheels (52) are tangent to the ground when the fuselage (10) is in an upright state, when the fuselage height adjusting piece (60) is in the lowest gear, a tangent of the rear wheels (52) located on the side of the rear wheels (52) away from the front wheel assembly (40) and passing through a preset point W of the support part (32) is L1, when the fuselage height adjusting piece (60) is in the highest gear, a tangent of the rear wheels (52) located on the side of the rear wheels (52) away from the front wheel assembly (40) and passing through the preset point W of the support part (32) is L2, and an angle β between the tangent L1 and the tangent L2 is an acute angle.

38. The walk-behind grass trimmer of claim 37, wherein, In the upright state, a straight line formed by the contact point of the support portion (32) with the ground and the contact point of the rear wheel (52) with the ground is L, and the distance between the intersection of the vertical line of the center of gravity of the body (10) and the midpoint of the straight line L is less than or equal to ±150 mm.

39. The walk-behind grass trimmer of claim 37, wherein, The included angle β is less than or equal to 15°.

40. The walk-behind grass trimmer according to claim 37, characterized in that, The size of the rear wheel (52) is the same as that of the front wheel of the front wheel assembly (40), and the rotation angle θ of the rear wheel (52) satisfies 90°≤θ≤270°, and the distance between the second shaft center and the first shaft center is greater than or equal to the vertical distance of the lowest cutting plane of the walk-behind grass trimmer between the highest gear and the lowest gear of the body height adjustment member (60); or The size of the rear wheel (52) is greater than or equal to the size of the front wheel of the front wheel assembly (40), and the rotation angle θ of the rear wheel (52) satisfies 90°<θ<270°, and the distance between the second shaft center and the first shaft center is greater than the vertical distance of the lowest cutting plane of the walk-behind grass trimmer between the highest gear and the lowest gear of the body height adjustment member (60). The lowest cutting plane is the cutting plane of the cutting member (70) when cutting at the lowest gear.

41. The walk-behind grass trimmer of claim 37, wherein, The radius size of the rear wheel (52) is greater than the distance between the second shaft center and the first shaft center by 20 mm.

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