CN220776551U - Grass trimmer - Google Patents

Abstract

The application discloses a grass mowing machine. The grass trimmer comprises a grass trimming head, an operating mechanism, a first shell and an outer rotor motor, wherein the grass trimming head is used for trimming, the operating mechanism is used for being held by a user to operate the grass trimmer, the first shell is connected to one end of the operating mechanism, the outer rotor motor comprises an outer rotor and a motor base, the outer rotor motor is inversely installed in the first shell in a mode that the motor base is arranged on one side of the outer rotor, deviating from the grass trimming head, and the outer rotor is directly connected with at least one part of the grass trimming head to drive the grass trimming head to rotate around a first straight line a. According to the grass trimmer, the outer rotor motor is inversely arranged in the first shell, and the outer rotor of the outer rotor motor is connected with at least one part of the grass trimmer, so that the connecting structures such as a flange and an insert are omitted, and the grass trimmer is compact in structure, small in size, light in weight and convenient to operate.

Description

Grass trimmer

Technical Field

The application relates to a garden tool, in particular to a grass mowing machine.

Background

The grass trimmer in the related art is a garden tool for driving a grass trimming rope to rotate to trim lawns by driving a grass trimming head to rotate at a high speed through a motor. The grass trimmer has the advantages of convenient operation, time and labor saving of grass trimming, high grass trimming efficiency and the like, so that the grass trimmer is widely applied to a plurality of places such as parks, family courtyards and the like.

After the motor of the existing grass trimmer is mounted to the shell, a motor shaft of the motor is connected with the grass trimmer through the flange and the insert, so that the grass trimmer can rotate around an axis, and the grass trimmer rope is driven to synchronously rotate. The installation mode causes the complex structure and larger volume of the grass trimmer, is inconvenient to operate, and cannot meet the miniaturization requirement of the grass trimmer.

This section provides background information related to the application, which is not necessarily prior art.

Disclosure of utility model

It is an object of the present application to solve or at least mitigate some or all of the above problems. Therefore, an object of the present application is to provide a grass trimmer that is compact, small, lightweight, and easy to operate.

In order to achieve the above object, the present application adopts the following technical scheme:

a grass trimmer comprising: the grass cutting head is used for carrying out grass cutting operation; the operating mechanism is used for being held by a user to operate the grass cutting machine; the first shell is connected to one end of the operating mechanism; the grass trimmer also comprises: the outer rotor motor comprises an outer rotor and a motor base, the outer rotor motor is inversely installed in the first shell in a mode that the motor base is arranged on one side, deviating from the grass mowing head, of the outer rotor, and the outer rotor is connected with at least one part of the grass mowing head so as to drive the grass mowing head to rotate around a first straight line a.

In some embodiments, the grass cutting head comprises a second housing comprising a removably connected upper cover and lower cover, the outer rotor being directly connected to the upper cover; or the outer rotor and the upper cover are integrally formed.

In some embodiments, the outer rotor is screwed with the upper cover; or the outer rotor is in buckle connection with the upper cover; or the outer rotor is in press fit with the upper cover.

In some embodiments, the grass trimmer further comprises a spool rotatably disposed within the second housing for winding a grass trimmer rope, and the outer rotor is coupled to the spool.

In some embodiments, the outer rotor motor portion structure extends into the grass cutting head such that the outer rotor and the grass cutting head partially overlap in a direction parallel to the first line a.

In some embodiments, the outer rotor motor further comprises a cooling fan, wherein the cooling fan is sleeved on the outer rotor and can synchronously rotate along with the outer rotor.

In some embodiments, the overall height b of the grass cutting head is 65mm or less in a direction parallel to the first line a.

In some embodiments, the height b of the grass cutting head as a whole is 70mm or less in a direction parallel to the first straight line a.

In some embodiments, the height b of the grass cutting head as a whole is 80mm or less in a direction parallel to the first straight line a.

In some embodiments, the grass cutting head weighs less than or equal to 0.3kg.

A grass trimmer comprising: the grass cutting head is used for carrying out grass cutting operation; the operating mechanism is used for being held by a user to operate the grass cutting machine; the first shell is connected to one end of the operating mechanism; the grass trimmer also comprises: an outer rotor motor, which comprises an outer rotor and a motor seat; the second shell is positioned at the lower end of the first shell; the spool is rotatably arranged in the second shell and is used for winding the grass beating rope; wherein: the outer rotor at least partially extends into the accommodation space formed by the second housing.

The application has the advantages that:

The grass trimmer comprises a grass trimming head, an operating mechanism, a first shell and an outer rotor motor, wherein the grass trimming head is used for trimming, the operating mechanism is used for being held by a user to operate the grass trimmer, the first shell is connected to one end of the operating mechanism, the outer rotor motor comprises an outer rotor and a motor seat, the outer rotor motor is inversely installed in the first shell in a mode that the motor seat is arranged on one side of the outer rotor, which is away from the grass trimming head, and the outer rotor is directly connected with at least one part of the grass trimming head to drive the grass trimming head to rotate around a first straight line a. According to the grass trimmer, the outer rotor motor is inversely arranged in the first shell, and the outer rotor of the outer rotor motor is directly connected with at least one part of the grass trimmer, so that the connecting structures such as a flange and an insert are omitted, and the grass trimmer is compact in structure, small in size, light in weight and convenient to operate.

Drawings

FIG. 1 is a schematic view of a lawnmower;

FIG. 2 is a cross-sectional view of a grass cutting head, an outer rotor motor, a first housing, and a radiator fan of the grass cutting machine;

FIG. 3 is a schematic view of a grass cutting head, an outer rotor motor, a first housing, and a radiator fan of the grass cutting machine;

FIG. 4 is a schematic view of a grass cutting head, an outer rotor motor, and a first housing of the grass cutting machine;

Fig. 5 is a schematic view of fig. 4 with the cover removed.

In fig. 1 to 5:

100. grass cutting head; 101. an upper cover; 102. a lower cover; 103. a spool; 104. knocking the cap;

200. a first housing;

300. an outer rotor motor; 301. an outer rotor; 3011. a fastening part; 302. a motor shaft; 303. a motor base;

400. A heat radiation fan;

500. An elastomer;

600. a battery pack;

700. An operating mechanism; 701. an operation lever; 702. a main handle; 703. an auxiliary handle; 704. and operating the wrench.

Detailed Description

Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings.

In the present disclosure, the terms "comprises," "comprising," "has," "having," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the present application, the term "and/or" is an association relationship describing an association object, meaning that three relationships may exist. For example, a and/or B may represent: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are in an "and/or" relationship.

In the present application, the terms "connected," "coupled," and "mounted" may be directly connected, coupled, or mounted, or indirectly connected, coupled, or mounted. By way of example, two parts or components are connected together without intermediate members, and by indirect connection is meant that the two parts or components are respectively connected to at least one intermediate member, through which the two parts or components are connected. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings, and may include electrical connections or couplings.

In the present application, one of ordinary skill in the art will understand that relative terms (e.g., "about," "approximately," "substantially," etc.) used in connection with quantities or conditions are intended to encompass the values and have the meanings indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a particular value, the tolerance associated with a particular value resulting from manufacture, assembly, use, and the like. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. Relative terms may refer to the addition or subtraction of a percentage (e.g., 1%,5%,10% or more) of the indicated value. Numerical values, not employing relative terms, should also be construed as having specific values of tolerance. Further, "substantially" when referring to relative angular positional relationships (e.g., substantially parallel, substantially perpendicular) may refer to adding or subtracting a degree (e.g., 1 degree, 5 degrees, 10 degrees, or more) from the indicated angle.

In the present application, those of ordinary skill in the art will appreciate that the functions performed by a component may be performed by a component, a plurality of components, a part, or a plurality of parts. Also, the functions performed by the elements may be performed by one element, by an assembly, or by a combination of elements.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", and the like are described in terms of orientation and positional relationship shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements. It should also be understood that the terms upper, lower, left, right, front, back, etc. are not only intended to represent positive orientations, but also to be construed as lateral orientations. For example, the lower side may include a right lower side, a left lower side, a right lower side, a front lower side, a rear lower side, and the like.

The application provides a grass trimmer, which is used for trimming vegetation such as lawns and the like. As shown in fig. 1, the grass trimmer includes a grass trimmer head 100, a first housing 200, an operating mechanism 700, an external rotor motor 300, and a battery pack 600. The operating mechanism 700 is used for being held by a user to operate the grass trimmer, the operating mechanism 700 comprises an operating lever 701, the battery pack 600 is connected to the top end of the operating lever 701, the first shell 200 is connected to the bottom end of the operating mechanism 700, and the operating lever 701 prolongs the operating range of the user, so that the user can use the grass trimmer to perform grass trimming without bending down. The grass cutting head 100 is a member for performing a grass cutting operation, and the outer rotor motor 300 is used to drive the grass cutting head 100 to rotate around the first line a. Specifically, the outer rotor motor 300 includes an outer rotor 301 and a motor base 303, the outer rotor 301 and the motor base 303 are arranged at intervals in a direction parallel to a first straight line a, one end of a motor shaft 302 of the outer rotor motor 300 is supported by a bearing arranged in the motor base 303, the outer rotor motor 300 is inversely installed in the first housing 200 in a manner that the motor base 303 is arranged on one side of the outer rotor 301 away from the grass cutting head 100, and the outer rotor 301 is directly connected with at least one component of the grass cutting head 100 to drive the grass cutting head 100 to rotate around the first straight line a.

Compared with the prior art that indirect connection between a motor shaft of a motor and a grass mowing head is required by means of a flange, an insert and the like, the grass mowing machine provided by the embodiment of the application adopts the outer rotor motor 300 as a driving component for driving the grass mowing head 100 to rotate, and the outer rotor 301 of the outer rotor motor 300 is directly connected with the grass mowing head 100, so that the use of a plurality of components such as the flange, the insert and the like is omitted, the structure of the grass mowing machine at the grass mowing head 100 and the outer rotor motor 300 is simplified, the structural compactness of the grass mowing machine is improved, the volume and the weight of the grass mowing machine are reduced, the grass mowing machine is easy to operate, and the use experience of a user is improved.

With continued reference to FIG. 1, the operator 700 also includes a handle structure coupled to the lever 701 upon which a user grasps to operate the grass cutting machine. In some embodiments, the handle structure includes a main handle 702 formed at the top end of the operating lever 701, the main handle 702 being a cylindrical lever structure, and the battery pack 600 being connected to the main handle 702. In some embodiments, the handle structure further includes a sub-handle 703 formed at the middle of the lever 701, the sub-handle 703 is a ring-shaped structure formed at the middle of the lever 701, and the user holds the main handle 702 with one hand and holds the sub-handle 703 with the other hand, so that the stability of the mowing operation is improved.

Optionally, an anti-slip structure is provided on the primary grip 702 or the secondary grip 703, including but not limited to anti-slip sleeves, anti-slip protrusions, anti-slip patterns, or the like. Of course, the main grip 702 and the sub grip 703 may be provided with the anti-slip structure at the same time.

The battery pack 600 is mainly used for supplying power to the external rotor motor 300, and in some embodiments, the battery pack 600 is detachably connected to the main handle 702, so that the battery pack 600 has detachability, and replacement of the battery pack 600 with full power when the battery pack 600 is out of power is facilitated. In one particular embodiment, the battery pack 600 is a lithium ion battery pack.

With continued reference to fig. 1, the operating mechanism 700 further includes an operating wrench 704, where one end of the operating wrench 704 is rotatably connected to the main handle 702, and by driving the operating wrench 704 to rotate around its rotation axis, the control board can be triggered and the outer rotor motor 300 is powered on or off, so that the grass cutting head 100 rotates around the first line a or stops rotating. Of course, the operating wrench 704 can be triggered in different ways to change the working mode of the grass cutting head 100, such as changing the grass cutting speed or the grass cutting direction.

As shown in fig. 2 to 5, the first housing 200 has a cover structure with an opening of a bottom plate, and the external rotor motor 300 is mounted in the first housing 200, specifically, a motor base 303 of the external rotor motor 300 is fixedly connected with the first housing 200, and the connection manner includes but is not limited to clamping connection, screw connection, and the like. In a specific embodiment, an annular step surface is formed on the motor base 303, a plurality of first connection holes are circumferentially arranged on the step surface, a plurality of second connection holes are arranged at corresponding positions on the first housing 200, and screws are screwed into a corresponding set of the first connection holes and the second connection holes.

With continued reference to fig. 2-4, the grass-cutting head 100 includes a second housing including an upper cover 101 and a lower cover 102 detachably connected, an installation space is formed between the upper cover 101 and the lower cover 102, and a grass-cutting rope is partially disposed in the installation space and partially disposed outside the installation space through the second housing to cut vegetation when the grass-cutting head 100 rotates about a first line a.

In some embodiments, outer rotor 301 is directly connected to upper cover 101. In one specific embodiment, outer rotor 301 is screwed to upper cover 101. In one particular embodiment, outer rotor 301 and upper cover 101 are snap-fit. As shown in fig. 4, a locking portion 3011 is provided on the outer wall surface of the outer rotor 301, a locking groove is provided in the upper cover 101, and the locking portion 3011 is locked in the locking groove. In one particular embodiment, outer rotor 301 is press fit with upper cover 101.

Of course, in other embodiments, the outer rotor 301 and the upper cover 101 may be integrally formed, so that the assembling steps may be simplified and the assembling efficiency may be improved.

In some embodiments, outer rotor motor 300 is partially structured to extend into grass cutting head 100 such that outer rotor 301 and grass cutting head 100 partially overlap in a direction parallel to first line a. So make the structure that the grass trimmer is located grass cutting head 100 and external rotor motor 300 department more compact, reduced the height of external rotor motor 300 and grass cutting head 100 in the direction that is parallel to first straight line a, further reduced the volume of grass trimmer.

In some embodiments, the overall height b of the grass cutting head 100 is 80mm or less in a direction parallel to the first line a. In some embodiments, the overall height b of the grass cutting head 100 is less than or equal to 70mm. In some embodiments, the overall height b of the grass cutting head 100 is less than or equal to 65mm.

In one embodiment, the overall height b of the grass cutting head 100 is 80mm; in one embodiment, the overall height b of the grass cutting head 100 is 75mm; in one embodiment, the overall height b of the grass cutting head 100 is 70mm; in one embodiment, the overall height b of the grass cutting head 100 is 65mm; in one embodiment, the overall height b of the grass cutting head 100 is 60mm.

In some embodiments, the grass cutting head 100 weighs less than or equal to 0.3kg. In one embodiment, the grass cutting head 100 weighs 0.3kg; in one embodiment, the grass cutting head 100 weighs 0.28kg; in one embodiment, the grass cutting head 100 weighs 0.25kg.

To enable the storage and securement of the mowing cord within the second housing, with continued reference to fig. 2, the mowing machine further comprises a spool 103 rotatably disposed within the second housing and adapted to wind the mowing cord. The portion of the grass rope is wound around the spool 103, and the spool 103 can rotate synchronously with the grass cutting head 100. In some embodiments, the outer wall surface of the spool 103 is convexly provided with a plurality of protruding parts, a winding space for winding the grass mowing rope is formed between adjacent protruding parts, the grass mowing rope is limited in the winding space, and a channel for extending the grass mowing rope out of the grass mowing head 100 is formed between the upper cover 101 and the lower cover 102.

The motor shaft 302 of the outer rotor motor 300 directly drives the spool 103 to rotate, the second housing can rotate relative to the spool 103, and the second housing can also slide relative to the spool 103 in the axial direction.

In some embodiments, spool 103 is formed with a first engagement tooth on an upper portion and a second engagement tooth on a lower portion. The second housing has first and second mating teeth formed therein. Specifically, the first mating teeth are formed on the upper cover 101, and the second mating teeth are formed on the lower cover 102.

The first mating teeth and the first engaging teeth mate when the second housing is in a first axial position relative to the spool 103, enabling synchronous rotation of the second housing when the spool 103 is rotated. Specifically, due to the design of the driving surfaces of the first engaging teeth and the first mating teeth, the first engaging teeth and the first mating teeth can only drive unidirectionally, while when relatively rotated in opposite directions, the spool 103 and the second housing can continuously relatively rotate due to slipping due to the inclined surfaces. The second engaging teeth and the second engaging teeth can form engagement when the second housing is in the second axial position relative to the spool 103, and because the second engaging teeth and the second engaging teeth are designed to have inclined surfaces, slippage occurs between the second engaging teeth and the second engaging teeth, so that the second housing cannot be completely driven by the spool 103 when the second housing is in the second axial position relative to the spool 103, and the second housing is rotated relative to the spool 103, except that the difference in rotational speed of the relative rotation is reduced by the engagement of the second engaging teeth and the second engaging teeth.

With continued reference to FIG. 2, the grass cutting head 100 also includes an elastomer 500, the elastomer 500 exerting a force between the lower cover 102 and the spool 103 such that the second housing is biased to an axial position in which it rotates in synchronism with the spool 103, i.e., the second housing described above is in a first axial position relative to the spool 103.

Grass cutting head 100 also includes a knocking cap 104, knocking cap 104 is rotatably connected to lower cover 102, and a bearing is provided between knocking cap 104 and lower cover 102, so that knocking cap 104 and lower cover 102 can rotate relatively, at the same time, knocking cap 104 and lower cover 102 move synchronously in the direction of first straight line a, that is, changing the position of knocking cap 104, lower cover 102 can also move together, that is, the second housing can change the axial position due to knocking cap 104.

When the grass cutting machine 400 is in the cutting mode, the user taps the grass cutting head 100, the tap cap 104 contacts the ground to cause the second housing to slide to a position in which the first engagement teeth and the first engagement teeth are disengaged, thereby causing them to rotate relatively, and further, the tap causes the second housing to slide to a second axial position relative to the spool 103, thereby causing the second housing to rotate relative to the spool 103 at a lower relative rotational speed, thereby causing the grass line wound on the spool 103 to release a portion of the grass cutting line out of the second housing, causing the grass cutting machine 400 to perform a pay-off mode. This has the advantage that the speed of the relative rotation of the second housing and the spool 103 is controlled while the external rotor motor 300 is still rotating at the rotational speed in the cutting mode, so that the user does not pay out excessive rope at each tap.

Of course, in some other embodiments, outer rotor 301 may be coupled directly to spool 103, including but not limited to a screw connection, a snap fit, etc., by driving spool 103 to rotate about first line a, thereby rotating the entire grass cutting head 100 about first line a. Of course, in some other embodiments, outer rotor 301 is coupled to both cover 101 and spool 103, thereby enabling more stable rotation of grass cutting head 100 about first line a.

With continued reference to fig. 2, outer rotor motor 300 further includes a cooling fan 400, and cooling fan 400 is sleeved on outer rotor 301 and can rotate synchronously with outer rotor 301. The setting of radiator fan 400 can improve the heat dispersion of grass trimmer, and external rotor motor 300 and grass cutting head 100 can produce a large amount of heat in the course of the work, sets up radiator fan 400 and can accelerate the air flow of external rotor motor 300 and grass cutting head 100 department to realize the forced air cooling heat dissipation of external rotor motor 300 and grass cutting head 100.

The foregoing has shown and described the basic principles, principal features and advantages of the application. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the application in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the application.

Claims (11)

1. A grass trimmer comprising:

a grass cutting head (100) for performing a grass cutting operation;

an operating mechanism (700) for being held by a user to operate the grass cutter;

a first housing (200), the first housing (200) being connected to one end of the operating mechanism (700);

the grass trimmer is characterized by further comprising:

the outer rotor motor (300), outer rotor motor (300) include outer rotor (301) and motor cabinet (303), outer rotor motor (300) with motor cabinet (303) set up in outer rotor (301) deviate from mode of grass cutting head (100) one side inversion install in first casing (200), outer rotor (301) with at least one part of grass cutting head (100) is connected, in order to drive grass cutting head (100) are rotatory around first straight line a.

2. A grass trimmer according to claim 1, characterized in that the grass trimmer head (100) comprises a second housing comprising an upper cover (101) and a lower cover (102) which are detachably connected, the outer rotor (301) being directly connected to the upper cover (101);

or the outer rotor (301) and the upper cover (101) are integrally formed.

3. Grass cutting machine according to claim 2, characterized in that the outer rotor (301) is screwed with the upper cover (101);

Or the outer rotor (301) is in buckling connection with the upper cover (101);

Or the outer rotor (301) is press-fitted with the upper cover (101).

4. A grass trimmer according to claim 2, further comprising a spool (103), the spool (103) being rotatably arranged in the second housing for winding a grass rope, the outer rotor (301) being connected to the spool (103).

5. A grass trimmer according to any one of claims 1-4, characterized in that the outer rotor motor (300) is partly structured to extend into the grass trimmer head (100) such that the outer rotor (301) and the grass trimmer head (100) partly overlap in a direction parallel to the first straight line a.

6. The grass cutting machine according to any one of claims 1-4, wherein the outer rotor motor (300) further includes a cooling fan (400), the cooling fan (400) is sleeved on the outer rotor (301) and can rotate synchronously with the outer rotor (301).

7. A grass trimmer according to any one of claims 1-4, characterized in that the height b of the grass cutting head (100) as a whole is less than or equal to 65mm in a direction parallel to the first straight line a.

8. A grass trimmer according to any one of claims 1-4, characterized in that the height b of the grass cutting head (100) as a whole is less than or equal to 70mm in a direction parallel to the first line a.

9. A grass trimmer according to any one of claims 1-4, characterized in that the height b of the grass cutting head (100) as a whole is 80mm or less in a direction parallel to the first line a.

10. A grass trimmer according to any one of claims 1-4, characterized in that the grass trimmer head (100) weighs less than or equal to 0.3kg.

11. A grass trimmer comprising:

a grass cutting head (100) for performing a grass cutting operation;

an operating mechanism (700) for being held by a user to operate the grass cutter;

a first housing (200), the first housing (200) being connected to one end of the operating mechanism (700);

The grass trimmer also comprises:

An outer rotor motor (300), the outer rotor motor (300) comprising an outer rotor (301) and a motor base (303);

a second housing located at a lower end of the first housing (200);

A spool (103), the spool (103) being rotatably disposed within the second housing and for winding a straw rope;

The method is characterized in that:

The outer rotor (301) extends at least partially into the accommodation space formed by the second housing.