Lawn aerator

Abstract

This application relates to the field of garden tool technology, and more particularly to a lawn mower, which includes a mowing head, a drive unit, a transmission unit, an operating device, and a connecting rod. The operating device includes a housing that houses the drive unit and the transmission unit. The housing has an air inlet and an air outlet, allowing airflow to enter the housing through the air inlet and flow through at least the connecting rod, gearbox, and motor before exiting through the air outlet. The airflow effectively dissipates heat from the connecting rod, gearbox, and motor, and also conducts heat from the mowing head and other components to the connecting rod for dissipation, resulting in efficient heat dissipation and good cooling performance.

Description

Technical Field

[0001] This application relates to the field of garden tool technology, and more particularly to a lawn mower. Background Technology

[0002] A lawnmower, as a garden tool, is particularly suitable for trimming lawns in villas and gardens. A lawnmower generally consists of a mowing head, a drive mechanism that rotates the mowing head, a transmission mechanism that connects the drive mechanism and the mowing head, and an operating mechanism that houses the drive mechanism and part of the transmission mechanism. During operation, the drive mechanism and transmission mechanism of a lawnmower generate heat, thus requiring heat dissipation channels. However, in existing technologies, most heat dissipation channels primarily target the circuit board, resulting in less than ideal heat dissipation. Summary of the Invention

[0003] The purpose of this application is to provide a lawn mower that dissipates heat effectively and has a good heat dissipation effect.

[0004] To achieve this objective, the following technical solution is adopted in this application:

[0005] A lawn mower, comprising:

[0006] A grass cutter head, used for rotation to perform cutting work;

[0007] The driving device includes a motor for driving the grass-trimming head to rotate;

[0008] The transmission device includes a gearbox and a transmission rod. The input end of the gearbox is connected to the output shaft of the motor, the output end of the gearbox is connected to one end of the transmission rod, and the other end of the transmission rod is connected to the hay trimmer head. The motor drives the hay trimmer head to rotate via the transmission device.

[0009] An operating device, comprising a housing that accommodates at least a portion of the drive device and at least a portion of the transmission device;

[0010] A connecting rod is used to connect the grass-beating head and the operating device, and at least part of the transmission rod is disposed within the connecting rod;

[0011] The device housing is provided with an air inlet and an air outlet. Airflow can enter the device housing through the air inlet and flow through at least the connecting rod, the gearbox and the motor before being discharged through the air outlet.

[0012] As an optional technical solution for the lawn mower, the air inlet includes a first air inlet, which is disposed on the outer surface of the device housing covering the connecting rod. Airflow can enter the interior of the device housing through the first air inlet, and flow through the connecting rod, the gearbox and the motor in sequence before being discharged through the air outlet.

[0013] As an optional technical solution for the lawn mower, the operating device also includes a main switch for controlling the drive device. The device housing is provided with a main switch opening. A part of the main switch is located inside the device housing, and another part extends out of the device housing through the main switch opening. The first air inlet includes the main switch opening.

[0014] As an optional technical solution for the lawn mower, the first air inlet is also provided on the outer surface of the device housing covering the main switch.

[0015] As an optional technical solution for the lawn mower, the operating device also includes a handle for the user to hold, and the first air inlet is also located at the handle.

[0016] As an optional technical solution for the lawn mower, the air inlet also includes a second air inlet, which is disposed on the outer surface of the device housing covering the gearbox. Airflow can enter the interior of the device housing through the second air inlet, and flow through the gearbox and the motor in sequence before being discharged through the air outlet.

[0017] As an optional technical solution for the lawn mower, the lawn mower also includes a circuit board, which is disposed inside the housing of the device and located below the gearbox.

[0018] As an optional technical solution for the lawn mower, the air inlet also includes a third air inlet, which is located on the outer surface of the device housing covering the circuit board. Airflow can enter the interior of the device housing through the third air inlet, and flow through the circuit board, the gearbox and the motor in sequence before being discharged through the air outlet.

[0019] As an optional technical solution for the lawn mower, the thermal conductivity of the connecting rod is greater than or equal to 10 W / (m·K), or the outer surface of the connecting rod is covered with a heat transfer element, the thermal conductivity of which is greater than or equal to 10 W / (m·K).

[0020] As an optional technical solution for lawn mowers, the heat transfer element includes metal foil.

[0021] As an optional technical solution for a lawn mower, a number of ribs are provided on the end face between the inner and outer rings of the gear in the gearbox, which are distributed circumferentially. The ribs can generate airflow when the gear rotates.

[0022] As an optional technical solution for the lawn mower, a motor fan is provided at the tail end of the motor, and the air outlet is located on the outer surface of the motor fan covered by the device housing. The diameter of the motor fan is 50 to 70 millimeters.

[0023] As an optional technical solution for the lawn mower, the diameter of the motor fan is 55 to 65 millimeters.

[0024] A lawn mower, comprising:

[0025] A grass cutter head, used for rotation to perform cutting work;

[0026] The driving device includes a motor for driving the grass-trimming head to rotate;

[0027] The transmission device includes a gearbox and a transmission rod. The input end of the gearbox is connected to the output shaft of the motor, the output end of the gearbox is connected to one end of the transmission rod, and the other end of the transmission rod is connected to the hay trimmer head. The motor drives the hay trimmer head to rotate via the transmission device.

[0028] The operating device includes a housing that accommodates the drive device and the transmission device;

[0029] A connecting rod is used to connect the grass-beating head and the operating device, and at least part of the transmission rod is disposed within the connecting rod;

[0030] The thermal conductivity of the connecting rod is greater than or equal to 10 W / (m·K), or the outer surface of the connecting rod is covered with a heat transfer element, the thermal conductivity of which is greater than or equal to 10 W / (m·K).

[0031] As an optional technical solution for lawn mowers, the heat transfer element includes metal foil.

[0032] The beneficial effects of this application are:

[0033] The grass trimmer provided in this application has an air inlet and an air outlet on the device housing, so that airflow can enter the device housing through the air inlet and flow through at least the connecting rod, gearbox and motor before being discharged through the air outlet. That is, the airflow can at least dissipate heat from the connecting rod, gearbox and motor, and the heat from the grass trimmer head and other components can also be conducted to the connecting rod and dissipated through the connecting rod. The heat dissipation is sufficient and the heat dissipation effect is good. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a lawn mower provided in one embodiment of this application;

[0035] Figure 2 This is a partial structural schematic diagram of a lawn mower provided in one embodiment of this application;

[0036] Figure 3 yes Figure 2 A schematic diagram of the structure after half of the device casing has been removed;

[0037] Figure 4 This is a schematic diagram of the airflow direction when air is introduced through the first air inlet;

[0038] Figure 5 This is a schematic diagram of the airflow direction when air is introduced through the second air inlet;

[0039] Figure 6 This is a schematic diagram of the airflow direction when air enters through the third air inlet.

[0040] In the picture:

[0041] 10. Cutting grass head; 11. Head shell;

[0042] 20. Drive unit; 21. Motor; 22. First housing;

[0043] 30. Operating device; 31. Device housing; 311. Main switch opening; 312. First air inlet; 313. Second air inlet; 314. Third air inlet; 315. Air outlet; 32. Handle; 33. Auxiliary handle; 34. Main switch;

[0044] 40. Transmission device; 41. Gearbox; 42. Transmission rod;

[0045] 50. Straw rope; 60. Protective cover; 70. Battery pack; 80. Connecting rod; 90. Circuit board. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set" and "connection" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0053] like Figures 1 to 3 As shown, this application provides a grass trimmer, including a trimmer head 10, a drive device 20, an operating device 30, and a transmission device 40.

[0054] The mowing head 10 is used to mount the mowing rope 50 and to drive the mowing rope 50 to rotate at high speed to cut vegetation such as grass and trees. The mowing head 10 includes a head shell 11, a spool, and a winding and unwinding device. The head shell 11 forms a receiving space around its central axis that can accommodate at least part of the spool. The head shell 11 may include an upper shell and a lower shell, which together enclose the receiving space. The spool is disposed within the receiving space and has a winding groove for winding the mowing rope 50. The winding and unwinding device is used to release or wind the mowing rope 50 by the mowing head 10. The winding and unwinding device is configured to allow relative rotation between the spool and the head shell 11, thereby releasing or winding the mowing rope 50. The head shell 11 has an outer threading hole for the trimming rope 50 to extend to the outside of the head shell 11, and the spool has an inner threading hole. When the inner and outer threading holes are located in the same radial direction, the trimming rope 50 can pass through the inner and outer threading holes in sequence. The portion of the trimming rope 50 that extends beyond the head shell 11 through the outer threading hole is defined as the effective portion of the trimming rope 50. The effective portion of the trimming rope 50 cuts weeds by high-speed rotation. A protective cover 60 is provided around the trimming head 10. The protective cover 60 is at least partially distributed around the trimming head 10 and can prevent grass clippings from flying into the user's standing direction when the trimming head 10 is trimming grass.

[0055] The drive device 20 is used to provide rotational power to the grass trimmer head 10. The drive device 20 includes a first housing 22 and a motor 21. The grass trimmer head 10 is rotatably mounted on the first housing 22. The motor 21 is used to drive the grass trimmer head 10 to rotate about the central axis of the head shell 11.

[0056] The operating device 30 includes a housing 31, a handle 32, an auxiliary handle 33, and a main switch 34. The handle 32 and auxiliary handle 33 are for the user to hold with both hands, allowing for more stable operation of the lawn mower. The main switch 34 can be located on the handle 32, allowing the user to directly operate the main switch to control the lawn mower while holding the handle 32. The housing 31 forms a connection for a power supply device; for example, the connection can accommodate a battery pack 70 to power the lawn mower. In this embodiment, the handle 32 is integrally formed with the housing 31. In some other embodiments, the handle 32 and the housing 31 may be formed separately. In this embodiment, the motor 21 is located within the housing 31. In some other embodiments, the motor 21 may be located within a first housing 22. The first housing 22 and the housing 31 are connected by a connecting rod 80, which has a through hole extending along its axial direction, through which a transmission rod 42 passes. The auxiliary handle 33 is mounted on the connecting rod 80.

[0057] The transmission device 40 is used to transmit the power of the motor 21 to the grass trimmer head 10. The transmission device 40 includes a gearbox 41 and a transmission rod 42. The gearbox 41 is disposed inside the device housing 31. The input end of the gearbox 41 is connected to the output shaft of the motor 21, and the output end of the gearbox 41 is connected to one end of the transmission rod 42. The other end of the transmission rod 42 extends into the first housing 22 and is connected to the grass trimmer head 10 for transmission. The motor 21 drives the grass trimmer head 10 to rotate around the central axis of the head housing 11 via the transmission device 40.

[0058] An air inlet and an air outlet 315 are provided on the housing 31 of the device. Airflow can enter the interior of the housing 31 through the air inlet and flow through at least the connecting rod 80, the gearbox 42 and the motor 21 before being discharged through the air outlet 315. That is, the airflow can at least dissipate heat from the connecting rod 80, the gearbox 42 and the motor 21. In addition, the heat from the grass trimmer 10 and other components can also be conducted to the connecting rod 80 and dissipated through the connecting rod 80. The heat dissipation is sufficient and the heat dissipation effect is good.

[0059] Reference Figure 2 and Figure 3 The air inlet includes a first air inlet 312, which is located on the outer surface of the device housing 31 covering the connecting rod 80. Airflow can enter the device housing 31 through the first air inlet 312, and then flow sequentially through the connecting rod 80, gearbox 41, and motor 21 before being discharged through the air outlet 315 (see reference). Figure 4 (As indicated by the arrow in the diagram). In this embodiment, a main switch opening 311 is provided on the device housing 31. A portion of the main switch 34 is located inside the device housing 31, and another portion extends out of the device housing 31 through the main switch opening 311. The first air inlet 312 includes the main switch opening 311. Furthermore, the first air inlet 312 is also provided on the outer surface of the device housing 31 covering the main switch 34. Alternatively, the first air inlet 312 can also be provided at the handle 32.

[0060] Reference Figure 2 and Figure 3 The air inlet also includes a second air inlet 313 and a third air inlet 314. The second air inlet 313 is located on the outer surface of the device housing 31 covering the gearbox 41. Airflow can enter the interior of the device housing 31 through the second air inlet 313, and then flow through the gearbox 41 and the motor 21 in sequence before being discharged from the air outlet 315 (see reference). Figure 5 (As indicated by the arrow in the image). Continue referring to... Figure 2 and Figure 3A circuit board 90 is installed inside the device housing 31, and the circuit board 90 is located below the gearbox 41. A third air inlet 314 is located on the outer surface of the device housing 31 covering the circuit board 90. Airflow can enter the device housing 31 through the third air inlet 314, and flow sequentially through the circuit board 90, the gearbox 41, and the motor 21 before being discharged through the air outlet 315 (see reference). Figure 6 (As indicated by the arrow in the image). By increasing the number of air inlets and arranging them appropriately, airflow can enter the device housing 31 through multiple channels and flow through different heat-generating components, resulting in more efficient heat dissipation.

[0061] The connecting rod 80 has a thermal conductivity greater than or equal to 10 W / (m·K), or the outer surface of the connecting rod 80 is covered with a heat transfer element, the thermal conductivity of which is greater than or equal to 10 W / (m·K). This configuration improves the thermal conductivity of the connecting rod 80, and, combined with allowing airflow through the air inlet of the connecting rod 80, significantly enhances the heat dissipation performance of the lawnmower. In some embodiments, the heat transfer element comprises a metal foil sheet.

[0062] The gearbox 41 has several ribs spaced circumferentially on the end face between the inner and outer rings of the gears. These ribs generate airflow when the gears rotate, allowing the gears to not only function as transmission components but also facilitate heat dissipation by allowing airflow. This prevents premature wear and failure of the gears due to grease's inability to withstand high temperatures, thus extending the gears' service life. There is no need to use better grease to address the grease's inability to withstand high temperatures; the grease can be universally used, reducing grease costs.

[0063] A motor fan is provided at the tail end of the motor 21, and an air outlet 315 is provided on the outer surface of the device housing 31 that covers the motor fan. The diameter of the motor fan is 50 to 70 mm. In some embodiments, the diameter of the motor fan is 55 to 65 mm.

[0064] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A lawn mower, comprising: The grass cutter head (10) is used to rotate to perform the cutting work; The drive unit (20) includes a motor (21) for driving the grass-beating head (10) to rotate; The transmission device (40) includes a gearbox (41) and a transmission rod (42). The input end of the gearbox (41) is connected to the output shaft of the motor (21), the output end of the gearbox (41) is connected to one end of the transmission rod (42), and the other end of the transmission rod (42) is connected to the grass trimmer (10). The motor (21) drives the grass trimmer (10) to rotate via the transmission device (40). The operating device (30) includes a device housing (31) that houses at least a portion of the drive device (20) and at least a portion of the transmission device (40); A connecting rod (80) is used to connect the grass-beating head (10) and the operating device (30), and at least part of the transmission rod (42) is disposed in the connecting rod (80); The device housing (31) is characterized by having an air inlet and an air outlet (315), wherein airflow can enter the device housing (31) through the air inlet and flow through at least the connecting rod (80), the gearbox (41) and the motor (21) before being discharged through the air outlet (315); The air inlet includes a first air inlet (312), which is disposed on the outer surface of the device housing (31) covering the connecting rod (80). Airflow can enter the device housing (31) through the first air inlet (312), and flow through the connecting rod (80), the gearbox (41) and the motor (21) in sequence before being discharged through the air outlet (315). The gearbox (41) has several ribs arranged circumferentially on the end face between the inner and outer rings of the gear, and the ribs can generate airflow when the gear rotates.

2. The brush cutter of claim 1, wherein The operating device (30) further includes a main switch (34) for controlling the drive device (20). The device housing (31) is provided with a main switch opening (311). A part of the main switch (34) is located inside the device housing (31), and another part extends out of the device housing (31) through the main switch opening (311). The first air inlet (312) includes the main switch opening (311).

3. The brush cutter of claim 2, wherein The first air inlet (312) is also provided on the outer surface of the device housing (31) covering the main switch (34).

4. The brush cutter of claim 2, wherein The operating device (30) also includes a handle (32) for the user to hold, and the first air inlet (312) is also located at the handle (32).

5. The brush cutter of any one of claims 1-4, wherein, The air inlet also includes a second air inlet (313), which is located on the outer surface of the device housing (31) covering the gearbox (41). Airflow can enter the device housing (31) through the second air inlet (313), and flow through the gearbox (41) and the motor (21) in sequence before being discharged through the air outlet (315).

6. The lawn mower according to any one of claims 1-4, characterized in that, The grass cutter also includes a circuit board (90), which is disposed inside the device housing (31) and located below the gearbox (41).

7. The lawn mower according to claim 6, characterized in that, The air inlet also includes a third air inlet (314), which is located on the outer surface of the device housing (31) covering the circuit board (90). Airflow can enter the device housing (31) through the third air inlet (314), and flow through the circuit board (90), the gearbox (41) and the motor (21) in sequence before being discharged through the air outlet (315).

8. The lawn mower according to claim 1, characterized in that, The thermal conductivity of the connecting rod (80) is greater than or equal to 10 W / (m•K), or the outer surface of the connecting rod (80) is covered with a heat transfer element, the thermal conductivity of which is greater than or equal to 10 W / (m•K).

9. The lawn mower according to claim 8, characterized in that, The heat transfer element includes metal foil.

10. The lawn mower according to claim 1, characterized in that, The motor (21) is equipped with a motor fan at its tail end, and the air outlet (315) is located on the outer surface of the motor fan covered by the housing (31) of the device. The diameter of the motor fan is 50 to 70 mm.

11. The lawn mower according to claim 10, characterized in that, The diameter of the motor fan is 55 to 65 millimeters.

12. A lawn mower, comprising: The grass cutter head (10) is used to rotate to perform the cutting work; The drive unit (20) includes a motor (21) for driving the grass-beating head (10) to rotate; The transmission device (40) includes a gearbox (41) and a transmission rod (42). The input end of the gearbox (41) is connected to the output shaft of the motor (21), the output end of the gearbox (41) is connected to one end of the transmission rod (42), and the other end of the transmission rod (42) is connected to the grass trimmer (10). The motor (21) drives the grass trimmer (10) to rotate via the transmission device (40). The operating device (30) includes a device housing (31) that houses the drive device (20) and the transmission device (40); A connecting rod (80) is used to connect the grass-beating head (10) and the operating device (30), and at least part of the transmission rod (42) is disposed in the connecting rod (80); The device housing (31) is characterized by having an air inlet and an air outlet (315) provided on it. Airflow can enter the interior of the device housing (31) through the air inlet and flow through at least the connecting rod (80), the gearbox (41) and the motor (21) before being discharged through the air outlet (315). The thermal conductivity of the connecting rod (80) is greater than or equal to 10 W / (m•K), or the outer surface of the connecting rod (80) is covered with a heat transfer element, the thermal conductivity of which is greater than or equal to 10 W / (m•K). The air inlet includes a first air inlet (312), which is disposed on the outer surface of the device housing (31) covering the connecting rod (80). Airflow can enter the device housing (31) through the first air inlet (312), and flow through the connecting rod (80), the gearbox (41) and the motor (21) in sequence before being discharged through the air outlet (315). The gearbox (41) has several ribs arranged circumferentially on the end face between the inner and outer rings of the gear, and the ribs can generate airflow when the gear rotates.

13. The lawn mower according to claim 12, characterized in that, The heat transfer element includes metal foil.

Images