CN117337685A - Hand-push type power tool - Google Patents

Abstract

The application discloses a hand propelled power tool. The main machine of the hand-push type power tool comprises a motor, a chassis, a battery pack, a main machine shell and a handle mechanism, wherein the chassis accommodates at least part of working elements, the motor rotates along a central axis a through a driving shaft to drive the working elements to move, the battery pack is used for supplying power to the motor, the main machine shell comprises a battery pack bin and is connected to the chassis, and the handle mechanism is mounted to the chassis. The chassis of the hand-push type power tool is provided with the first accommodating cavity for accommodating and installing the motor and the accommodating part for accommodating at least part of the working element, and the weight of the chassis of the hand-push type power tool is set to be at least 15% of that of the main machine, so that the chassis has larger weight, the gravity center of the hand-push type power tool is relatively forward, the phenomenon of backward turning is not easy to occur in all using modes, and the using feeling and the using safety performance of a user are improved.

Description

Hand-push type power tool

Technical Field

The application relates to the technical field of electric equipment, in particular to a hand-push type power tool.

Background

As a hand-push type power tool, the mower is widely applied to places such as families, hotels and the like where lawns and vegetation need to be trimmed, and the mower can be used for rapidly trimming the lawns and the vegetation, so that the labor intensity of workers is greatly reduced, and the working efficiency of the workers is improved.

The mower comprises a main machine and a chassis, wherein the main machine comprises a grass basket frame and a grass collecting bag, the grass basket frame is arranged at the rear of a main machine shell, and the grass collecting bag is arranged on the grass basket frame. To facilitate the user's flexible operation of the mower, existing chassis are generally made of lightweight materials. When the mower is in a mode that the grass collecting bag is required to collect the cut broken grass, the gravity center of the mower moves backwards gradually along with the gradual increase of the broken grass collected in the grass collecting bag, so that a user needs larger force to control the mower, the use experience of the user is seriously affected, and the user is easy to turn backwards to cause a safety accident. Of course, other hand propelled power tools than lawnmowers also have this disadvantage.

Therefore, how to provide a hand-push type power tool which is not easy to turn backward is a technical problem to be solved.

Content of the application

The utility model provides an aim at provides a hand propelled power tool, this hand propelled power tool's focus is relatively before, is difficult for taking place to turn over backward in the use.

To achieve the purpose, the application adopts the following technical scheme:

a hand propelled power tool comprising: a host, the host comprising: a chassis housing at least part of a working element for performing the function of the hand propelled power tool; a motor for driving the working element to move through a driving shaft, wherein the driving shaft rotates along a central axis a; the battery pack is used for supplying power to the motor; the host shell comprises a battery pack bin and is connected with the chassis; a handle mechanism mounted to the chassis; the chassis is formed with a first accommodation cavity for accommodating and mounting the motor, and is also formed with an accommodation part for accommodating at least part of the working elements, and the weight of the chassis is at least 15% of the weight of the host machine.

Preferably, the chassis is a disk-shaped structure made of at least one of aluminum and plastic.

Preferably, the hand propelled power tool further comprises a wheel set for supporting the chassis, the wheel set comprises a front wheel set and a rear wheel set, the rear wheel set comprises a rear wheel driving shaft arranged along the second rotation axis, and the distance g between the center of gravity of the chassis and the rear wheel driving shaft is greater than 320mm.

Preferably, the front wheel set comprises a front wheel axle arranged along a third rotation axis, and the distance h between the center of gravity of the chassis and the front wheel axle is greater than 320mm.

Preferably, the working element comprises a mowing element, and the linear velocity M of the knife tip of the mowing element is greater than or equal to 2900M/min and less than or equal to 5791M/min.

Preferably, the chassis is a non-uniform thickness member, and the weight of the chassis is 8kg or more and 11kg or less.

Preferably, the chassis is formed with a cavity therein, and the weight of the material required for manufacturing the cavity is 60% of the weight of the same material required for manufacturing the chassis.

Preferably, the host further comprises a blue grass frame and a grass collecting bag, wherein the blue grass frame is mounted at the rear of the host shell, and the grass collecting bag is detachably connected to the blue grass frame; when the grass collecting bag is configured to fully crush grass, the distance between the gravity center of the hand-push type power tool and the forefront end of the hand-push type power tool is at most 50% of the total length of the hand-push type power tool.

A hand propelled power tool comprising: a host, the host comprising: a chassis housing at least part of a working element for performing the function of the hand propelled power tool; a motor for driving the working element to move through a driving shaft, wherein the driving shaft rotates along a central axis a; the battery pack is used for supplying power to the motor; the host shell comprises a battery pack bin and is connected with the chassis; a handle mechanism mounted to the chassis; the chassis is provided with a first accommodating cavity for accommodating and mounting the motor, and is also provided with an accommodating part for accommodating at least part of the working elements; the hand propelled power tool still includes the wheelset, the wheelset is used for supporting the chassis, the wheelset includes front wheelset and rear wheelset, rear wheelset includes the rear wheel drive axle that sets up along the second axis of rotation, the focus of chassis with distance g between the rear wheel drive axle front wheelset includes the front axle that sets up along the third axis of rotation, the focus of chassis with distance h between the front axle, wherein, 0.8 is ltoreq g/h is ltoreq 1.2.

Preferably, the distance g between the centre of gravity of the chassis and the rear wheel drive axle is greater than 320mm.

The beneficial effects of this application:

according to the hand-push type power tool, the weight of the chassis is set to be at least 15% of the weight of the main machine, so that the chassis has larger weight, the gravity center of the hand-push type power tool is relatively front, the phenomenon of backward turning is not easy to occur in all using modes, and the using experience and the using safety performance of a user are improved.

Drawings

FIG. 1 is a schematic view of a mower provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a host of a mower according to an embodiment of the present application;

FIG. 3 is a cross-sectional view of a host machine of a mower provided by an embodiment of the present application;

FIG. 4 is a schematic view of the structure of a chassis of a mower provided in an embodiment of the present application;

FIG. 5 is a top view of a chassis of a lawn mower provided in an embodiment of the present application;

FIG. 6 is a cross-sectional view taken along the direction A-A in FIG. 5;

FIG. 7 is an exploded view of a host machine of a mower provided by an embodiment of the present application;

FIG. 8 is a schematic view of a portion of a main housing and chassis of a lawn mower provided in an embodiment of the present application;

FIG. 9 is a schematic view of a portion of the structure of a chassis of a mower provided in an embodiment of the present application;

FIG. 10 is a schematic view of a wheelset of a chassis of a lawnmower provided in an embodiment of the present application in a first mode of use;

FIG. 11 is a schematic view of a wheelset of a chassis of a lawnmower provided in an embodiment of the present application in a second mode of use;

FIG. 12 is a schematic view of a first handle mechanism of a lawn mower provided in an embodiment of the present application;

fig. 13 is a schematic view of a second handle mechanism of a mower provided in an embodiment of the present application.

In the figure:

1000. a mower;

100. a host; 101. a motor;

102. a chassis; 1021. a first mounting portion; 1022. a second mounting portion; 1023. a handle mounting portion; 1024. a first accommodation chamber; 1025. a housing part; 1026. a third mounting portion; 1027. a step surface; 1028. a motor housing;

103. a front wheel set; 1031. a first front wheel; 1032. a second front wheel; 1033. a front axle;

104. a rear wheel set; 1041. a first rear wheel; 1042. a second rear wheel; 1043. a rear axle; 1044. a rear wheel drive motor; 1045. a rear wheel drive shaft;

105. an adjusting mechanism; 1051. a first gear plate; 1052. a second gear plate; 1053. a connecting mechanism; 1054. a first operating member; 1055. a second operating member;

106. a battery pack bin; 1061. a main body portion; 10611. a guide part; 10612. a joint; 1062. a battery compartment cover;

107. maintaining a bin; 1071. a second accommodation chamber; 1072. a second accommodation chamber cover;

108. a fan; 109. a mowing element; 110. an air duct; 111. an air inlet;

120. a main body case; 130. a wheel set;

200. an operating mechanism; 210. a first handle mechanism; 220. a second handle mechanism; 201. a handle portion; 202. a connecting rod; 2021. a first lever; 2022. a second lever; 203. a handle connection;

300. a battery pack; 310. a first battery pack; 320. a second battery pack;

400. an electronic component; 410. a motor control board; 420. a power control board;

500. a grass collecting bag.

Detailed Description

The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The application provides a hand-push type power tool which is operated by hand pushing of a user and can realize a certain function of a working element. In this embodiment, as shown in fig. 1, the hand-push type power tool is a mower 1000, the working element is a mowing element 109, however, in other embodiments, the hand-push type power tool may be another power tool, and the corresponding working element may be an element capable of achieving other functions.

Specifically, as shown in fig. 1 to 3, the mower 1000 includes a main body 100, an operating mechanism 200, and a grass bag 500. The main unit 100 is a main body mechanism of the whole mower 1000, and includes a main unit housing 120, a motor 101, a chassis 102, a wheel set 130, an adjusting mechanism 105, a battery pack 300, and an electronic component 400. The main housing 120 is mainly used for mounting the battery pack 300 and the electronic assembly 400, and the chassis 102 is mainly used for mounting the motor 101, the mowing element 109, the wheel set 130 and the adjusting mechanism 105. The motor 101 drives the mowing element 109 to rotate by a drive shaft to mow, the drive shaft rotating along the central axis a. The wheelset 130 is used to support the chassis 102. The adjustment mechanism 105 is used to adjust the mowing height. The battery pack 300 is used to power the motor 101. The electronic assembly 400 is electrically connected to the motor 101 and is used to control the power output of the mower 1000.

With continued reference to fig. 1, an operating mechanism 200 is coupled to the rear of the main machine 100 for being held by a user to operate the mower 1000. The grass collecting bag 500 is also connected to the rear of the main machine 100 and is located below the operating mechanism 200, and the grass collecting bag 500 is used for accommodating broken grass generated when the mower 1000 performs mowing operation.

The structure of the host 100 is described below with reference to fig. 1 to 9.

As shown in fig. 2, the main body case 120 has a shell-like structure extending in the front-rear direction. The chassis 102 is also disposed in the front-rear direction, and the main housing 120 is a shell-like structure disposed above the chassis 102, and in this embodiment, the main housing 120 and the chassis 102 are two housings independent from each other and are fixed by a connector. Of course, in other embodiments, the main housing 120 and the chassis 102 may be integrally formed, so long as the requirements for installing other functional components are met. The main housing 120 may be a housing formed by plastic injection molding, or may be a housing formed by stamping a sheet metal part or a metal housing formed by die casting.

As shown in fig. 3 and 4, the chassis 102 is formed with a first accommodation chamber 1024 for accommodating the motor 101, and as shown in fig. 5 and 6, the chassis 102 is also formed with an accommodation portion 1025 for accommodating the mowing element 109, the accommodation portion 1025 being formed at a lower half of the first accommodation chamber 1024. In this embodiment, the first accommodating cavity 1024 is a stepped hole, which includes a motor accommodating portion 1028 with a smaller size and located above and an accommodating portion 1025 of the mowing element 109 with a larger size and located below, and a stepped surface 1027 is formed at a middle portion of the first accommodating cavity 1024. When the motor 101 is disposed in the first accommodation chamber 1024, the motor housing of the motor 101 is stopped against the stepped surface 1027, and the drive shaft of the motor 101 is disposed extending in the direction of the central axis a shown in fig. 3. A mowing element 109 is connected to the drive shaft. In the present embodiment, the mowing element 109 is at least one mowing blade arranged circumferentially around the drive shaft, the mowing blade being rotatable about the axis a under the drive of the motor 101, so as to effect cutting of vegetation.

As shown in fig. 2 and 7, the main body case 120 is formed with a battery pack compartment 106 for mounting the battery pack 300, and the battery pack compartment 106 is located above the first accommodation chamber 1024 in the vertical direction.

Specifically, as shown in fig. 7, the battery pack compartment 106 includes a main body portion 1061 formed on the main body housing 120 and a battery compartment cover 1062 that is connected to the main body portion 1061 in an openable manner, wherein the main body portion 1061 is configured to accommodate the battery pack 300, and the battery compartment cover 1062 is configured to be fastened to the main body portion 1061 after the battery pack 300 is placed in the battery pack compartment 106, thereby protecting the battery pack 300. The battery pack 300 disposed in the battery pack compartment 106 can be electrically connected to the motor 101 to power the motor 101.

In some specific embodiments, with continued reference to fig. 7, at least two coupling portions 10612 for detachably coupling the battery pack 300 to the main body case 120 and a guide portion 10611 for guiding the battery pack 300 to be coupled to the coupling portions 10612 along a plugging direction b, which forms an acute angle with the direction of the central axis a, are provided in the battery pack compartment 106, and the battery pack 300 partially overlaps the motor 101 in the direction along the central axis a. It should be noted that, the guiding portion 10611 is a guiding inclined plane formed in the battery pack compartment 106, and the combining portion 10612 is a spring clamping groove formed in the battery pack compartment 106, and the spring clamping groove can be clamped with a buckle on the battery pack 300, so as to fix and limit the battery pack 300.

The mower 1000 sets the included angle between the inserting direction b and the direction of the central axis a of the driving shaft as an acute angle, and the battery pack 300 and the motor 101 are partially overlapped in the direction along the central axis a, so that the utilization rate of the internal space of the host housing 120 is improved, the user can apply force when inserting and extracting the battery pack 300 conveniently, and the use experience of the user is improved. It should be noted that, the present application does not specifically limit the size of the included angle between the direction of the insertion direction b and the direction of the central axis a, and only needs to be able to satisfy the improvement of the utilization rate of the internal space of the host housing 120 within the angular range of the acute angle, which is beneficial to the realization of miniaturization of the mower 1000 and the convenience of the user for inserting and extracting the battery pack 300.

Further, a plane that defines the center of the battery pack 300 and is parallel to the insertion direction b is a first plane, and the battery pack 300 includes a front portion located at a front side of the first plane and a rear portion located at a rear side of the first plane in the pushing direction c of the hand propelled power tool. In some specific embodiments, the lowest point of the front part of the battery pack 300 is lower than the highest point of the motor 101 along the direction of the central axis a, so that the space of the main housing 120 and the chassis 102 in the vertical direction can be fully utilized, and the compactness of each component in the main housing 100 is further improved, so that the space utilization is further improved.

Alternatively, in some more specific embodiments, the number of battery packs 300 is one, and the battery packs 300 are located in front of the central axis a in the pushing direction c of the hand-push type power tool. Since the battery pack 300 is disposed in front of the central axis a on the main body case 120 to move forward the center, the structure is more stable, and thus the battery pack 300 disposed in front of the central axis a is easier to operate and can ensure structural stability of the entire main body 100.

Alternatively, in some side-by-side embodiments, the number of battery packs 300 is at least two. Correspondingly, at least two main body parts 1061 are arranged on the main body shell 120 at intervals along the horizontal direction, wherein the horizontal direction refers to the front-back horizontal direction along the pushing direction c, a combination part 10612 is arranged in each main body part 1061, and at least two battery packs 300 are inserted into at least two main body parts 1061 in a one-to-one correspondence manner.

Alternatively, as shown with continued reference to fig. 3 and 7, in the present embodiment, two battery packs 300 are provided, the two battery packs 300 including a first battery pack 310 and a second battery pack 320, the main body portion 1061 including a first main body portion located in front of the central axis a and a second main body portion located behind the central axis a, the first battery pack 310 being inserted into the first main body portion, the second battery pack 320 being inserted into the second main body portion.

Further, the first battery pack 310 is inserted into the first body portion along the first inserting direction, and an included angle between the first inserting direction and the direction of the central axis a is a first acute angle. The second battery pack 320 is inserted into the second body portion along a second insertion direction, and an included angle between the second insertion direction and the direction of the central axis a is a second acute angle. It should be noted that the first acute angle and the second acute angle may be set to be the same or different according to the requirement. In some embodiments, the first acute angle and the second acute angle are the same to reduce the design and manufacturing difficulty of the two body portions 1061 of the host housing 120; in some other embodiments, the first acute angle and the second acute angle may be unequal, so that the display portions of the end surfaces of the first battery pack 310 and the second battery pack 320 can face the operator, and the user can insert and remove the battery pack 300 conveniently.

Further, the lowest point of the first battery pack 310 is located in the same plane as the lowest point of the second battery pack 320; the highest point of the first battery pack 310 is located in the same plane as the highest point of the second battery pack 320. The arrangement is such that the first battery pack 310 and the second battery pack 320 are arranged in parallel in space, and the layout is more compact.

Further, the first battery pack 310 and the second battery pack 320 do not overlap in the direction of the central axis a. Therefore, the first battery pack 310 and the second battery pack 320 can be prevented from interfering with each other in the direction of the central axis a, and the phenomenon that the two battery packs 300 can be plugged and unplugged only according to the preset sequence is avoided, which is beneficial to ensuring the plugging and unplugging flexibility of the battery packs 300.

Further, with continued reference to fig. 3, the spacing d between the first battery pack 310 and the second battery pack 320 is greater than 30mm. This prevents the first battery pack 310 and the second battery pack 320 from being too close to each other, and prevents the structure of the main body case 120 between the first battery pack 310 and the second battery pack 320 from being too small to support the weight of the two battery packs 300.

The electronic assembly 400 is used to control the power output of the motor 101, and as shown in fig. 2 and 8, the main housing 120 or chassis 102 is formed with or connected to a service bay 107, the service bay 107 including a second receiving cavity 1071 for receiving the electronic assembly 400. The second accommodating chamber 1071 is provided with an opening, and the opening is connected with a second accommodating chamber cover 1072 in an openable and closable manner. Opening the second housing chamber cover 1072 can open an opening where the electronic assembly 400 can be installed into the second housing chamber 1071 or removed from the second housing chamber 1071. Closing the second receiving chamber cover 1072 can close the opening after the electronic assembly 400 is mounted into the second receiving chamber 1071, thereby protecting the electronic assembly 400. In the present embodiment, the second accommodation chamber 1071 is formed on the main body case 120, and the second accommodation chamber 1071 is provided behind the first accommodation chamber 1024 and the battery pack compartment 106 in the pushing direction c of the mower 1000.

The electronic assembly 400 may generate a lot of heat during operation, and if the heat is accumulated in the second accommodating chamber 1071 and cannot be quickly dissipated, the temperature in the second accommodating chamber 1071 may be too high, so that the electronic assembly 400 cannot work normally. In some embodiments, with continued reference to fig. 3, the first housing chamber 1024 and the second housing chamber 1071 are in communication via the air duct 110, the output end of the motor 101 is connected or formed with a fan 108, when the motor 101 rotates, the fan 108 forms a heat dissipation air, and the heat dissipation air flows from the second housing chamber 1071 to the first housing chamber 1024 via the air duct 110 and out of the first housing chamber 1024.

The mower 1000 communicates the first accommodating chamber 1024 with the second accommodating chamber 1071 by using the air duct 110, and connects or forms the fan 108 at the output end of the motor 101, so that when the motor 101 rotates, the fan 108 forms heat dissipation air, and the heat dissipation air can flow from the second accommodating chamber 1071 to the first accommodating chamber 1024 through the air duct 110, and finally flows out from the first accommodating chamber 1024, so that the heat dissipation air passes through a plurality of components, and the heat dissipation effect and the heat dissipation efficiency are improved. It should be noted that, the air duct 110 may be a virtual structure such as a hole formed in the main housing 120 and the chassis 102, or may be a physical structure such as a pipe. In the present embodiment, the chassis 102 and the maintenance bin 107 are formed with an air duct 110.

Specifically, as shown in fig. 9, an air intake 111 is formed in at least a part of the structure of the main body case 120 between the battery compartment 106 and the second accommodation chamber 1071, and the heat dissipation air flows into the second accommodation chamber 1071 through the air intake 111. Optionally, the number of the air inlets 111 is multiple, and the plurality of air inlets 111 are arranged in a fence shape, so that the air inlet quantity can be improved, and the heat dissipation effect is improved. An air outlet is formed in at least a portion of the chassis 102, and cooling air flows out of the first accommodating chamber 1024 from the air outlet.

In some particular embodiments, with continued reference to fig. 3 and 8, the electronic assembly 400 includes a motor control board 410 electrically connected to the motor 101 and a power control board 420 electrically connected to the power device, with heat dissipation wind passing through the motor control board 410 and the power control board 420 in sequence. So can realize the simultaneous heat dissipation to motor control board 410 and power control board 420, radiating efficiency is higher, and the radiating effect is better.

Specifically, a partition plate is formed or connected in the second accommodating chamber 1071, the partition plate divides the second accommodating chamber 1071 into a first chamber and a second chamber which are mutually communicated, the first chamber is located in front of the second chamber along the pushing direction c of the mower 1000, and the cooling air flows out after passing through the first chamber, the second chamber, the air duct 110 and the first accommodating chamber 1024 in sequence, and the motor control board 410 and the power control board 420 are respectively located in the first chamber and the second chamber.

Further, with continued reference to fig. 3, in some embodiments, the distance e between the motor control board 410 and the central axis a is less than 260mm. Too large a distance e may result in too long a path of the air duct 110, which may not only affect the heat dissipation effect, but also be detrimental to processing the air duct 110 on the chassis 102. Further, with continued reference to fig. 3, in some embodiments, the distance f between the power control board 420 and the central axis a is less than 350mm. Too large a distance f may result in too long a path of the air duct 110, which may not only affect the heat dissipation effect, but also be detrimental to processing the air duct 110 on the chassis 102. Of course, in other embodiments, the distance e between the motor control board 410 and the central axis a and the distance f between the power control board 420 and the central axis a may be set to other values as desired.

Further, at least part of the chassis 102 is a metal part, the electronic assembly 400 is provided with a heat dissipation part, at least part of the heat dissipation part is in contact with the metal part of the chassis 102, and heat dissipation air generated by rotation of the fan 108 flows from the second accommodating cavity 1071 to the first accommodating cavity 1024 through the air duct 110, and flows out from the first accommodating cavity 1024. Since the metal heat transfer efficiency is high, the heat dissipation efficiency and the heat dissipation effect can be further improved by making at least part of the chassis 102 of a metal material and directly contacting the part made of the metal material with the heat dissipation part of the electronic component 400.

It should be noted that, in some embodiments, the motor 101, the battery pack 300, and the electronic assembly 400 may be integrated into a housing to form a power head, and a power head cavity having a larger size for accommodating the power head is formed in the main housing 120, and the power head may be inserted into the power head cavity along a mounting direction. The mounting direction here may be parallel to the central axis.

The wheel set 130 is used for supporting the chassis 102, as shown in fig. 1, 10 and 11, the wheel set 130 specifically includes a front wheel set 103 and a rear wheel set 104, the front wheel set 103 includes two front wheels, namely a first front wheel 1031 and a second front wheel 1032, the first front wheel 1031 and the second front wheel 1032 are disposed at the front end of the chassis 102, the first front wheel 1031 is rotatably disposed at the left side of the front end of the chassis 102, the second front wheel 1032 is rotatably disposed at the rear side of the front end of the chassis 102, the first front wheel 1031 and the second front wheel 1032 are connected by a front axle 1033, the front axle 1033 has a U-shaped structure, and a middle portion of the front axle 1033 is rotatably connected to the chassis 102.

The rear wheel set 104 includes two rear wheels of a first rear wheel 1041 and a second rear wheel 1042, the first rear wheel 1041 and the second rear wheel 1042 are disposed at the rear end of the chassis 102, and the first rear wheel 1041 and the second rear wheel 1042 are rotationally connected through a rear wheel axle 1043, the first rear wheel 1041 is rotationally disposed at the left side of the rear end of the chassis 102, and the second rear wheel 1042 is rotationally disposed at the right side of the rear end of the chassis 102. The axis of rotation of the two front wheels relative to the front axle 1033 is not coincident with the axis of rotation of the front axle 1033 relative to the chassis 102, and the axis of rotation of the two rear wheels relative to the rear axle 1043 is not coincident with the axis of rotation of the rear axle 1043 relative to the chassis 102.

The adjustment mechanism 105 includes a connection mechanism 1053, and in this embodiment, the connection mechanism 1053 is specifically a link, and both ends of the link are connected to the front axle 1033 and the rear axle 1043, respectively. The rear wheel set 104 further includes a rear wheel drive motor 1044 and a rear wheel drive shaft 1045, the rear wheel drive motor 1044 being connected to the rear wheel axle 1043 by the rear wheel drive shaft 1045 for driving the rear wheel axle 1043 to rotate.

The adjustment mechanism 105 further includes an operating member for operating to adjust the mowing height and a gear plate for controlling the mowing height. Specifically, the gear plate is formed with a gear groove, and the operating member passes through the gear groove from one side of the gear plate to the other side of the gear plate, so to speak, the operating member partially protrudes to the gear groove. The gear groove comprises a plurality of inward concave gear grooves and connecting grooves, the gear grooves can accommodate the operating piece, and the side walls of the gear grooves can limit the movement of the operating piece. The operating members are located in different gear recesses and the mower 1000 is defined at different mowing heights. The connecting groove enables the plurality of gear grooves to be connected, and the operating piece changes positions among the plurality of gear grooves through the connecting groove. When a user needs to adjust mowing height, the operating piece is moved out of one gear groove along the direction of the gear groove to enter the connecting groove, then slides to a position close to the other gear groove along the connecting groove, and moves into the gear groove along the direction of the other gear groove. The gear plate is of an arc plate-shaped structure, and optionally, a gear mark is arranged on the gear plate. The operating member is coupled to the linkage 1053 for driving the linkage 1053 in rotation, thereby driving the front axle 1033 and the rear axle 1043 in rotation to effect adjustment of the mowing height.

In some embodiments, the shift plates include a first shift plate 1051 and a second shift plate 1052, the operators include a first operator 1054 and a second operator 1055, the first operator 1054 is used in conjunction with the first shift plate 1051 to adjust the height of the rear of the chassis 102, and the second shift plate 1052 and the second operator 1055 are used in conjunction to adjust the height of the front of the chassis 102. The chassis 102 includes a first mounting portion 1021 for mounting the first gear plate 1051, a second mounting portion 1022 for selectively mounting the second gear plate 1052, and a third mounting portion 1026 for selectively mounting a connection mechanism 1053 for connecting the front wheel set 103 and the rear wheel set 104.

In a more specific embodiment, the chassis 102 includes a first usage mode and a second usage mode. As shown in fig. 10, in the first use mode, the adjusting mechanism 105 adjusts the overall height of the chassis 102 through the first gear plate 1051, the first operating member 1054 mated with the first gear plate 1051, and the connecting mechanism 1053 to achieve adjustment of the mowing height. As shown in fig. 11, in the second usage mode, the adjustment mechanism 105 adjusts the height of the rear side of the chassis 102 by the first gear plate 1051 and the first operating member 1054 engaged with the first gear plate 1051, and adjusts the height of the front side of the chassis 102 by the second gear plate 1052 and the second operating member 1055 engaged with the second gear plate 1052, so as to achieve adjustment of the mowing height.

The chassis 102 of the mower 1000 is provided with the first mounting part 1021 for mounting the first gear plate 1051, the second mounting part 1022 for selectively mounting the second gear plate 1052 and the third mounting part 1026 for selectively mounting the connecting mechanism 1053 for connecting the front wheel set 103 and the rear wheel set 104, so that the chassis 102 can be adapted to a plurality of mowers 1000 for different scenes, and the mower has the advantages of strong universality, wide application range, good flatform and lower cost.

As shown in fig. 1, 12 and 13, the mower 1000 further includes an operating mechanism 200, and the operating mechanism 200 is specifically a handle mechanism. In some embodiments, the operating mechanism 200 includes at least one of the first handle mechanism 210 and the second handle mechanism 220, at least one of the first handle mechanism 210 and the second handle mechanism 220 being rotatable about a first axis of rotation, the chassis 102 selectively mounting either the first handle mechanism 210 or the second handle mechanism 220. Thus, the platform of the chassis 102 can be realized, so that the chassis 102 can be compatible with the installation of various handle mechanisms, and the use flexibility of the mower 1000 is improved.

It should be noted that, the first handle mechanism 210 or the second handle mechanism 220 herein refers to two handle mechanisms with different structures, and the specific structure is not limited, and any handle mechanism on the existing mower 1000 may be used in the present embodiment.

In some embodiments, the first handle mechanism 210 and the second handle mechanism 220 are mounted in the same position on the chassis 102, and the mounting position on the chassis 102 for mounting the handle mechanisms is the handle mounting portion 1023. Therefore, the replacement efficiency of the handle mechanism can be improved, and the phenomenon that a user installs misplacement when the handle mechanism is replaced is avoided. Alternatively, the handle attachment portion 1023 is provided with a handle connector 203 at an attachment position, and the connecting lever 202 of the first handle mechanism 210 or the connecting lever 202 of the second handle mechanism 220 can be rotatably connected to the handle connector 203. Alternatively, the handle connecting member 203 is an iron plate or other plate, and the connecting end of the handle mechanism is rotatably connected to the handle connecting member 203 through a rotation shaft.

As shown in fig. 12 and 13, the first handle mechanism 210 and the second handle mechanism 220 each include a handle portion 201 for a user to hold and a connecting rod 202 for connecting the handle portion 201 and the main body 100, the handle portion 201 being disposed to extend in a first direction, and the connecting rod 202 being disposed to extend in a second direction. Optionally, the first direction is perpendicular to the second direction to improve the aesthetic property and the assembling convenience of the handle mechanism.

In some more specific embodiments, at least one of the first handle mechanism 210 and the second handle mechanism 220 includes a connecting rod 202 that is capable of telescoping in the second direction. In the present embodiment, as shown in fig. 12, the first handle mechanism 210 capable of telescoping in the second direction includes a first rod 2021 and a second rod 2022 that are sleeved, and the first rod 2021 and the second rod 2022 are telescopically connected, and the length can be changed by telescoping. Illustratively, the handle mechanism includes a household money handle and a professional money handle, the household money handle is configured to be retractable for facilitating storage, so as to reduce space occupied during idling, and the professional money handle is configured to be of a non-retractable structure for ensuring service life.

With continued reference to fig. 1, the grass collecting bag 500 is used for collecting the grass pieces cut by the cutting element, as the amount of grass pieces collected increases, the weight in the grass collecting bag 500 increases, and since the grass collecting bag 500 is disposed at the rear of the host 100, as the amount of grass pieces collected by the grass collecting bag 500 increases, the center of gravity of the whole mower 1000 moves backward, and thus a backward turning phenomenon is liable to occur. To avoid the occurrence of the roll-over phenomenon, in some embodiments, the chassis 102 may weigh at least 15% of the weight of the host machine 100.

The weight of the chassis 102 is set to be at least 15% of the weight of the main machine 100, so that the chassis 102 has larger weight, the gravity center of the hand-push type power tool is relatively forward, the phenomenon of backward turning is not easy to occur in all using modes, and the using feeling and the using safety performance of a user are improved.

Alternatively, the chassis 102 is a disk-like structure made of at least one of aluminum and plastic. Of course, besides aluminum and plastic, the chassis 102 may be made of other materials with larger density, so that the chassis 102 has larger weight under the same volume, so as to increase the weight ratio of the chassis 102 in the whole mower 1000, further enable the center of the mower 1000 to be positioned as front as possible, and avoid the phenomenon of backward turning when the grass collecting bag 500 is full of grass.

At the same time, as the weight of the chassis 102 increases, its strength increases accordingly. In the prior art, when the mowing member cuts vegetation, the cutting speed of the mowing member is limited due to insufficient strength of the chassis. In the embodiment of the present application, the linear velocity M of the blade edge of the mowing element 109 is 2900M/min or more and 5791M/min or less due to the improvement of the strength of the chassis 102.

In some embodiments, the rear wheel drive shaft 1045 is rotatably disposed about the second axis of rotation, and the distance g between the center of gravity of the chassis 102 and the rear wheel drive shaft 1045 is greater than 320mm. In some embodiments, the front axle 1033 is rotatably disposed about a third axis of rotation, and the distance h between the center of gravity of the chassis 102 and the front axle 1033 is greater than 320mm. In some more specific embodiments, 0.8.ltoreq.g/h.ltoreq.1.2, for example, the ratio may be 0.9, 1, or 1.1, so that the center of gravity of the chassis 102 is ensured to be in the center region between the front axle 1033 and the rear wheel drive axle 1045, avoiding occurrence of the roll-over phenomenon.

In some embodiments, the chassis 102 is a non-uniform thickness member, and the weight of the chassis 102 is greater than or equal to 8kg and less than or equal to 11kg, e.g., the weight of the chassis 102 may be 8kg, 9kg, 10kg, or 11kg. In some embodiments, the chassis 102 has a cavity formed therein, and the weight of material required to make the cavity is 60% of the weight of the same material required to make the chassis 102. It will be appreciated that the channel is a portion of the receptacle 1025 adjacent to the mowing element 109, the receptacle 1025 includes a channel and a grass discharge channel, the channel accommodates the mowing element 109, and in particular, when the mowing element 109 cuts vegetation, rotation of the mowing element 109 creates an air flow within the channel, the cut vegetation is guided by the air flow within the channel to flow from the channel to the grass discharge channel and into the grass collection bag 500. It will be appreciated that the mower elements 109 rotate to form a cutting radius and that the inner wall of the channel is a circular profile having a radius slightly greater than the cutting radius.

In some embodiments, the host 100 further includes a grass stand (not shown) mounted to the rear of the host housing 120, to which the grass collection bag 500 is detachably attached, and the distance between the center of gravity of the mower 1000 and the forefront of the mower 1000 is at most 50% of the total length of the mower 1000 when the grass collection bag 500 is full of crushed grass. Thus, the gravity center of the mower 1000 is ensured to be positioned at the front half part of the mower 1000, and the phenomenon that the mower 1000 turns backwards is thoroughly avoided.

It is apparent that the above examples of the present application are merely illustrative examples of the present application and are not limiting of the embodiments of the present application. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modifications, equivalent substitutions, improvements, etc. that fall within the spirit and principles of the present application are intended to be included within the scope of the claims of this application.

Claims (10)

1. A hand propelled power tool comprising:

a host (100), the host (100) comprising:

a chassis (102) housing at least part of a working element for performing the function of the hand propelled power tool;

a motor (101) for driving the working element to move by a driving shaft, the driving shaft rotating along a central axis a;

-a battery pack (300) for powering said motor (101);

a main housing (120) including a battery compartment (106) and connected to the chassis (102);

a handle mechanism mounted to the chassis (102);

it is characterized in that the method comprises the steps of,

the chassis (102) is formed with a first accommodation chamber (1024) for accommodating and mounting the motor (101), the chassis (102) is further formed with an accommodation portion (1025) for accommodating at least part of the working element, and the weight of the chassis (102) is at least 15% of the weight of the host machine (100).

2. The hand propelled power tool according to claim 1, wherein,

the chassis (102) is a disc-shaped structure made of at least one of aluminum and plastic.

3. The hand propelled power tool according to claim 1, wherein,

the hand propelled power tool further comprises a wheel set (130), the wheel set (130) is used for supporting the chassis (102), the wheel set (130) comprises a front wheel set (103) and a rear wheel set (104), the rear wheel set (104) comprises a rear wheel driving shaft (1043) arranged along a second rotation axis, and a distance g between the center of gravity of the chassis (102) and the rear wheel driving shaft (1043) is larger than 320mm.

4. A hand propelled power tool according to claim 3 and wherein,

the front wheel set (103) comprises a front wheel axle arranged along a third rotation axis, and the distance h between the centre of gravity of the chassis (102) and the front wheel axle is greater than 320mm.

5. The hand propelled power tool according to claim 1, wherein,

the working element comprises a mowing element, and the linear speed M of the cutter tip of the mowing element is greater than or equal to 2900M/min and less than or equal to 5791M/min.

6. The hand propelled power tool according to claim 1, wherein,

the chassis (102) is a non-uniform thickness member, and the weight of the chassis (102) is more than or equal to 8kg and less than or equal to 11kg.

7. The hand propelled power tool according to claim 1, wherein,

the chassis (102) is internally provided with a cavity, and the weight of the material required for manufacturing the cavity accounts for 60% of the weight of the same material required for manufacturing the chassis (102).

8. The hand propelled power tool according to any of claims 1 to 7,

the host (100) further comprises a blue grass frame and a grass collecting bag (500), wherein the blue grass frame is mounted behind the host shell (120), and the grass collecting bag (500) is detachably connected to the blue grass frame;

the grass collection bag (500) is configured such that when grass is fully crushed, the distance between the center of gravity of the hand propelled power tool and the forward-most end of the hand propelled power tool is at most 50% of the total length of the hand propelled power tool.

9. A hand propelled power tool comprising:

a host (100), the host (100) comprising:

a chassis (102) housing at least part of a working element for performing the function of the hand propelled power tool;

a motor (101) for driving the working element to move by a driving shaft, the driving shaft rotating along a central axis a;

-a battery pack (300) for powering said motor (101);

a main housing (120) including a battery compartment (106) and connected to the chassis (102);

a handle mechanism mounted to the chassis (102);

it is characterized in that the method comprises the steps of,

-said chassis (102) being formed with a first housing cavity (1024) for housing and mounting said motor (101), said chassis (102) being further formed with a housing portion (1025) for housing at least part of said working element;

the hand propelled power tool still includes wheelset (130), wheelset (130) are used for supporting chassis (102), wheelset (130) are including preceding wheelset (103) and rear wheelset (104), rear wheelset (104) are including rear wheel drive axle (1043) that set up along the second axis of rotation, the focus of chassis (102) with distance g between rear wheel drive axle (1043) preceding wheelset (103) are including the front axle that sets up along the third axis of rotation, the focus of chassis (102) with distance h between the front axle, wherein, 0.8 be less than or equal to g/h be less than or equal to 1.2.

10. The hand propelled power tool of claim 9, wherein a distance g between a center of gravity of the chassis (102) and the rear wheel drive axle (1043) is greater than 320mm.