CN118266320A

CN118266320A - Grass trimmer

Info

Publication number: CN118266320A
Application number: CN202211713217.8A
Authority: CN
Inventors: 李春蕊; 展锐
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2024-07-02

Abstract

The application relates to the technical field of garden tools, in particular to a grass trimmer, which comprises a grass trimming head, a driving device, a transmission device, an operating device and a connecting rod. The operating device comprises a device shell for accommodating the driving device and the transmission device, an air inlet and an air outlet are formed in the device shell, and air flow can enter the device shell from the air inlet and is discharged from the air outlet after flowing through the connecting rod, the gear box and the motor at least. The air current can dispel the heat to connecting rod, gear box and motor at least to the heat of grass-mowing head and other parts can also conduct to the connecting rod, and give off through the connecting rod, and the heat gives off fully, and the radiating effect is good.

Description

Grass trimmer

Technical Field

The application relates to the technical field of garden tools, in particular to a grass mowing machine.

Background

The grass trimmer is used as a garden tool, and is particularly suitable for trimming grasslands such as villa lawns, garden lawns and the like. The grass trimmer generally includes a grass trimmer head, a drive device for driving the grass trimmer head to rotate, a transmission device for connecting the drive device to the grass trimmer head in a transmission manner, and an operating device for accommodating the drive device and a part of the transmission device. The grass cutting machine can generate certain heat in the working process of the driving device, the transmission device and the like, so that a heat dissipation channel is required to be arranged to dissipate the generated heat. In the prior art, most of heat dissipation channels mainly dissipate heat to the circuit board, so that the heat dissipation effect is not ideal.

Disclosure of Invention

The application aims to provide a grass mower, which has sufficient heat dissipation and good heat dissipation effect.

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

A grass trimmer comprising:

The grass cutting head is used for rotating to execute cutting work;

the driving device comprises a motor for driving the grass cutting head to rotate;

The transmission device comprises a gear box and a transmission rod, the input end of the gear box is connected with the output shaft of the motor, the output end of the gear box is connected with one end of the transmission rod, the other end of the transmission rod is connected with the grass cutting head, and the motor drives the grass cutting head to rotate through the transmission device;

An operating device comprising a device housing accommodating at least part of the drive device and at least part of the transmission device;

The connecting rod is used for connecting the grass mowing head and the operating device, and at least part of the transmission rod is arranged in the connecting rod;

The device comprises a device shell, and is characterized in that an air inlet and an air outlet are formed in the device shell, and air flow can enter the device shell from the air inlet and is discharged from the air outlet after at least flowing through the connecting rod, the gear box and the motor.

As the optional technical scheme of grass cutting machine, the air intake includes first air intake, first air intake set up in the cladding of device casing the surface of connecting rod, the air current can by first air intake gets into inside the device casing to flow through in proper order the connecting rod the gear box and behind the motor by the air outlet discharge.

As an alternative technical scheme of the grass cutting machine, the operating device further comprises a main switch for controlling the driving device, a main switch opening is formed in the device shell, one part of the main switch is located in the device shell, the other part of the main switch extends out of the device shell through the main switch opening, and the first air inlet comprises the main switch opening.

As an alternative technical scheme of the grass trimmer, the first air inlet is further formed in the outer surface of the main switch covered by the device shell.

As an alternative technical scheme of the grass cutting machine, the operating device further comprises a handle for being held by a user, and the first air inlet is further arranged at the handle.

As the alternative technical scheme of grass cutting machine, the air intake still includes the second air intake, the second air intake set up in the device casing cladding the surface of gear box, the air current can by the second air intake gets into inside the device casing to flow through in proper order the gear box with behind the motor by the air outlet discharges.

As the alternative technical scheme of grass trimmer, grass trimmer still includes the circuit board, the circuit board set up in the device casing, and be located the below of gear box.

As the optional technical scheme of grass cutting machine, the air intake still includes the third air intake, the third air intake set up in the cladding of device casing the surface of circuit board, the air current can by the third air intake gets into inside the device casing to flow through in proper order the circuit board the gear box and behind the motor by the air outlet discharge.

As an alternative technical scheme of the grass cutting machine, the heat conductivity coefficient of the connecting rod is more than or equal to 10W/(m.K), or the heat transfer element is coated on the outer surface of the connecting rod, and the heat conductivity coefficient of the heat transfer element is more than or equal to 10W/(m.K).

As an alternative to the grass trimmer, the heat transfer element comprises a metal foil.

As an alternative technical scheme of the grass cutting machine, a plurality of ribs which are distributed at intervals along the circumferential direction are arranged on the end face between the inner ring and the outer ring of the gear box, and the ribs can form air flow when the gear rotates.

As an alternative technical scheme of the grass mowing machine, a motor fan is arranged at the tail end of the motor, the air outlet is formed in the outer surface of the motor fan covered by the device shell, and the diameter of the motor fan is 50-70 mm.

As an alternative solution of the grass trimmer, the motor fan has a diameter of 55 to 65 mm.

A grass trimmer comprising:

The grass cutting head is used for rotating to execute cutting work;

An operating device comprising a device housing accommodating the drive device and the transmission device;

The heat conductivity coefficient of the connecting rod is more than or equal to 10W/(m.K), or the heat transfer element is coated on the outer surface of the connecting rod, and the heat conductivity coefficient of the heat transfer element is more than or equal to 10W/(m.K).

The application has the beneficial effects that:

According to the grass mowing machine provided by the application, the air inlet and the air outlet are formed in the device shell, so that air flow can enter the device shell through the air inlet and is discharged through the air outlet after flowing through the connecting rod, the gear box and the motor, namely, the air flow can at least radiate heat of the connecting rod, the gear box and the motor, heat of the grass mowing head and other parts can be conducted to the connecting rod and radiated through the connecting rod, the heat radiation is sufficient, and the radiating effect is good.

Drawings

FIG. 1 is a schematic view of a grass trimmer according to an embodiment of the present application;

FIG. 2 is a schematic view of a part of a grass trimmer according to an embodiment of the present application;

FIG. 3 is a schematic view of the device housing of FIG. 2 after the half of the device housing has been removed;

FIG. 4 is a schematic diagram illustrating the airflow direction of the first air inlet;

FIG. 5 is a schematic diagram illustrating the airflow direction of the second inlet;

fig. 6 is a schematic diagram of airflow direction of the third air inlet.

In the figure:

10. grass cutting head; 11. a head shell;

20. a driving device; 21. a motor; 22. a first housing;

30. An operating device; 31. a device housing; 311. a main switch opening; 312. a first air inlet; 313. a second air inlet; 314. a third air inlet; 315. an air outlet; 32. a handle; 33. an auxiliary handle; 34. a main switch;

40. a transmission device; 41. a gear box; 42. a transmission rod;

50. Beating grass ropes; 60. a shield; 70. a battery pack; 80. a connecting rod; 90. a circuit board.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the product of the application, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

As shown in fig. 1 to 3, the present application provides a grass trimmer including a grass trimmer head 10, a driving device 20, an operating device 30 and a transmission device 40.

The grass cutting head 10 is used for installing a grass cutting rope 50 and driving the grass cutting rope 50 to rotate at a high speed to cut vegetation such as vegetation. The grass cutting head 10 includes a head housing 11, a spool, and a take-up and pay-off device. The head case 11 is formed with an accommodating space capable of accommodating at least a part of the bobbin around a central axis of the head case 11. The head housing 11 may include an upper case and a lower case, which together enclose an accommodating space. The spool is provided in the accommodation space, and has a winding groove for winding the grass-playing rope 50. The winding and unwinding device is used for enabling the grass mowing head 10 to release or wind the grass mowing rope 50, and is arranged to enable the spool and the head shell 11 to rotate relatively, so that the spool releases or winds the grass mowing rope 50. The head case 11 is formed with an outer threading hole through which the grass cutting rope 50 is extended to the outside of the head case 11, and the spool is formed with an inner threading hole through which the grass cutting rope 50 can sequentially pass when the inner threading hole and the outer threading hole are located in the same radial direction. The portion of the grass cutting rope 50 protruding out of the head housing 11 through the outer threading hole is defined as an effective portion of the grass cutting rope 50, and the effective portion of the grass cutting rope 50 cuts off weeds by high-speed rotation. The grass cutting head 10 is provided with a shield 60 at its periphery, the shield 60 being distributed at least partially around the grass cutting head 10, which prevents grass clippings from flying into the standing direction of the user when the grass cutting head 10 is cutting grass.

The driving device 20 is used for providing rotary power for the grass cutting head 10, the driving device 20 comprises a first shell 22 and a motor 21, the grass cutting head 10 is rotatably arranged on the first shell 22, and the motor 21 is used for driving the grass cutting head 10 to rotate by taking the central axis of the head shell 11 as a shaft.

The operating device 30 includes a device housing 31, a handle 32, an auxiliary handle 33, and a main switch 34. The handle 32 and the auxiliary handle 33 are used for holding the user's both hands, respectively, so that the lawnmower can be operated more stably. The main switch 34 may be provided on the handle 32, and a user can directly operate the main switch 34 to control the grass trimmer to crop while holding the handle 32. The device housing 31 is used to form a coupling to a power device, for example, the coupling can be coupled to a battery pack 70 to power the mower. In the present embodiment, the handle 32 is integrally formed with the device housing 31. In some other embodiments, the handle 32 and the device housing 31 may also be formed separately. In the present embodiment, the motor 21 is disposed in the device housing 31. In some other embodiments, the motor 21 may also be disposed within the first housing 22. The first housing 22 and the device housing 31 are connected by a connecting rod 80, and the connecting rod 80 has a through hole penetrating in the axial direction thereof, and the transmission rod 42 penetrates through the through hole. An auxiliary handle 33 is mounted on the connecting rod 80.

The transmission device 40 is used for transmitting power of the motor 21 to the grass cutting head 10, the transmission device 40 comprises a gear box 41 and a transmission rod 42, the gear box 41 is arranged in the device shell 31, the input end of the gear box 41 is connected with the output shaft of the motor 21, the output end of the gear box 41 is connected with one end of the transmission rod 42, the other end of the transmission rod 42 stretches into the first shell 22 and is in transmission connection with the grass cutting head 10, and the motor 21 drives the grass cutting head 10 to rotate by taking the central axis of the head shell 11 as a shaft through the transmission device 40.

The device shell 31 is provided with the air inlet and the air outlet 315, air flow can enter the device shell 31 from the air inlet and is discharged from the air outlet 315 after flowing through the connecting rod 80, the gear box 42 and the motor 21 at least, namely, the air flow can at least radiate heat of the connecting rod 80, the gear box 42 and the motor 21, heat of the grass mowing head 10 and other components can be conducted to the connecting rod 80 and radiated through the connecting rod 80, heat radiation is sufficient, and a radiating effect is good.

Referring to fig. 2 and 3, the air inlet includes a first air inlet 312, the first air inlet 312 is disposed on the outer surface of the device housing 31 and covers the connecting rod 80, and the air flow can enter the device housing 31 through the first air inlet 312 and sequentially flow through the connecting rod 80, the gear case 41 and the motor 21 and then be discharged through the air outlet 315 (as shown by the arrow in fig. 4). In this embodiment, the device housing 31 is provided with a main switch opening 311, a part of the main switch 34 is located in the device housing 31, another part of the main switch 34 extends out of the device housing 31 through the main switch opening 311, and the first air inlet 312 includes the main switch opening 311. In addition, the first air inlet 312 is further disposed on the outer surface of the device housing 31 covering the main switch 34. Or the first air intake 312 may also be provided at the handle 32.

Referring to fig. 2 and 3, the air inlet further includes a second air inlet 313 and a third air inlet 314, the second air inlet 313 is disposed on the outer surface of the device housing 31 covering the gear box 41, and air flow can enter the device housing 31 through the second air inlet 313 and sequentially flow through the gear box 41 and the motor 21 and then be discharged through the air outlet 315 (as shown by the arrow in fig. 5). With continued reference to fig. 2 and 3, the circuit board 90 is disposed in the device housing 31, and the circuit board 90 is located below the gear box 41, and the third air inlet 314 is disposed on the outer surface of the device housing 31 covering the circuit board 90, so that the air flow can enter the device housing 31 through the third air inlet 314, sequentially flow through the circuit board 90, the gear box 41 and the motor 21, and then be discharged through the air outlet 315 (as shown by the arrow in fig. 6). By increasing the number of air inlets and performing reasonable layout, air flows can enter the device housing 31 through a plurality of channels and flow through different heating devices, and heat dissipation is more sufficient.

The thermal conductivity of the connecting rod 80 is greater than or equal to 10W/(mK), or the outer surface of the connecting rod 80 is coated with a heat transfer member, and the thermal conductivity of the heat transfer member is greater than or equal to 10W/(mK). Through the arrangement, the heat conducting performance of the connecting rod 80 can be improved, and meanwhile, the air flow is matched to flow through the air inlet of the connecting rod 80, so that the heat radiating performance of the grass trimmer can be greatly improved. In some embodiments, the heat transfer element comprises a metal foil.

The end face between the inner ring and the outer ring of the gear box 41 is provided with a plurality of ribs which are distributed at intervals along the circumferential direction, and the ribs can form air flow when the gear rotates, so that the gear not only plays a role of a transmission part, but also can enable air flow to facilitate heat dissipation of the gear, early abrasion failure of the gear caused by the fact that grease is not resistant to high temperature and fails prematurely is avoided, and the service life of the gear is prolonged. The problem that the grease is not resistant to high temperature is solved without using better grease, the grease is universal, and the cost of the grease is reduced.

The tail end of the motor 21 is provided with a motor fan, and the air outlet 315 is arranged on the outer surface of the device shell 31, which is wrapped by the motor fan, and the diameter of the motor fan is 50-70 mm. In some embodiments, the motor fan has a diameter of 55 to 65 millimeters.

It is to be understood that the above examples of the present application are provided for clarity of illustration only 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 modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are desired to be protected by the following claims.

Claims

1.A grass trimmer comprising:

A grass cutting head (10) for rotation to perform a cutting operation;

The driving device (20) comprises a motor (21) for driving the grass cutting head (10) to rotate;

The transmission device (40) comprises a gear box (41) and a transmission rod (42), wherein the input end of the gear box (41) is connected with the output shaft of the motor (21), the output end of the gear box (41) is connected with one end of the transmission rod (42), the other end of the transmission rod (42) is connected with the grass cutting head (10), and the motor (21) drives the grass cutting head (10) to rotate through the transmission device (40);

Operating means (30) comprising a device housing (31) housing at least part of said driving means (20) and at least part of said transmission means (40);

a connecting rod (80) for connecting the grass-mowing head (10) and the operating device (30), at least part of the transmission rod (42) being arranged in the connecting rod (80);

The device is characterized in that an air inlet and an air outlet (315) are formed in the device shell (31), and air flow can enter the device shell (31) from the air inlet and is discharged from the air outlet (315) after at least flowing through the connecting rod (80), the gear box (41) and the motor (21).

2. The grass trimmer of claim 1, wherein the air inlet includes a first air inlet (312), the first air inlet (312) is disposed on the outer surface of the device housing (31) covering the connecting rod (80), and an air flow can enter the device housing (31) through the first air inlet (312) and sequentially flow through the connecting rod (80), the gear box (41) and the motor (21) and then be discharged through the air outlet (315).

3. Grass cutting machine according to claim 2, characterized in that the operating device (30) further comprises a main switch (34) for controlling the driving device (20), the device housing (31) is provided with a main switch opening (311), a part of the main switch (34) is located in the device housing (31), another part protrudes out of the device housing (31) through the main switch opening (311), and the first air inlet (312) comprises the main switch opening (311).

4. A grass trimmer according to claim 3, wherein the first air inlet (312) is further provided in the outer surface of the device housing (31) surrounding the main switch (34).

5. A grass cutting machine according to claim 3, wherein the operating device (30) further comprises a handle (32) for being gripped by a user, the first air inlet (312) being further provided at the handle (32).

6. A grass cutting machine according to any one of claims 2-5, wherein the air inlet further comprises a second air inlet (313), the second air inlet (313) is arranged on the outer surface of the gear box (41) covered by the device housing (31), and air flow can enter the device housing (31) through the second air inlet (313) and sequentially flow through the gear box (41) and the motor (21) and then be discharged through the air outlet (315).

7. A grass trimmer according to any one of claims 2-5, further comprising a circuit board (90), said circuit board (90) being arranged within said device housing (31) below said gearbox (41).

8. The grass cutting machine as claimed in claim 7, wherein the air inlet further comprises a third air inlet (314), the third air inlet (314) is disposed on the outer surface of the device housing (31) covering the circuit board (90), and air flow can enter the device housing (31) through the third air inlet (314) and sequentially flow through the circuit board (90), the gear box (41) and the motor (21) and then be discharged through the air outlet (315).

9. Grass cutting machine according to claim 1, characterized in that the thermal conductivity of the connecting rod (80) is greater than or equal to 10W/(m-K), or the outer surface of the connecting rod (80) is coated with a heat transfer element, the thermal conductivity of which is greater than or equal to 10W/(m-K).

10. A lawnmower as claimed in claim 9 wherein said heat transfer element comprises a metal foil.

11. Grass cutting machine according to claim 1, characterized in that the end face between the inner ring and the outer ring of the gear of the gearbox (41) is provided with a number of ribs distributed at intervals in the circumferential direction, which ribs can form an air flow when the gear rotates.

12. Grass trimmer according to claim 1, characterized in that the tail end of the motor (21) is provided with a motor fan, the air outlet (315) is arranged on the outer surface of the motor fan covered by the device housing (31), and the motor fan has a diameter of 50 to 70 mm.

13. A lawnmower as claimed in claim 12 wherein the motor fan has a diameter of 55 to 65 mm.

14. A grass trimmer comprising:

A grass cutting head (10) for rotation to perform a cutting operation;

An operating device (30) comprising a device housing (31) accommodating the drive device (20) and the transmission device (40);

The heat-conducting material is characterized in that the heat conductivity coefficient of the connecting rod (80) is more than or equal to 10W/(m.K), or the heat-conducting material is coated on the outer surface of the connecting rod (80), and the heat conductivity coefficient of the heat-conducting material is more than or equal to 10W/(m.K).

15. A lawnmower as claimed in claim 14 wherein said heat transfer element comprises a metal foil.