Heat dissipation structure of grass trimming head

Abstract

The utility model belongs to the technical field of gardening tools, and particularly relates to a heat dissipation structure of a grass trimming head, which comprises a machine head main body, a driving motor and a transmission shaft are respectively arranged in the machine head main body, the driving motor is directly or indirectly connected with the transmission shaft, a heat dissipation disc and a clamping disc are arranged at the lower end of the transmission shaft, and a saw blade is arranged between the heat dissipation disc and the clamping disc. The heat dissipation disc, the saw blades and the clamping disc can synchronously rotate along with the transmission shaft, a plurality of fan blade parts are arranged on the heat dissipation disc, ventilation channels are formed in the adjacent fan blade parts in a concave and separated mode, ventilation parts are arranged on the machine head body in a penetrating mode from top to bottom, and the ventilation parts are communicated with the ventilation channels. When the saw blade rotates, wind power can be generated to enter the ventilation channel and take away heat generated in the machine head body, and the machine head is a product which is simple in structure and capable of dissipating heat of parts in the grass trimming head and does not need to be shut down for rest.

Description

Technical Field

[0001] The utility model belongs to the technical field of gardening tools, and particularly refers to a heat dissipation structure of a grass cutting head. Background Art

[0002] The grass cutting head is a rotating mechanism at the front end of a lawn mower. The blades it is equipped with can quickly trim the weeds on the lawn. In order to save space and the volume of the lawn mower and facilitate cooperation with the blades, the internal speed reduction device and motor are both arranged inside the grass cutting head. Therefore, the small grass cutting head has to bear a high workload. However, the heat generated by the high-speed rotating motor and speed reduction device is very high. Especially when operating in a narrow space, if heat dissipation is not achieved, it is easy to cause damage to internal parts, resulting in the need for workers to stop the machine for rest and heat dissipation after cutting the lawn at high speed for a while, which particularly affects work efficiency. Therefore, there is a need for a product that can dissipate heat from the parts inside the grass cutting head without the need to stop for rest. Summary of the Invention

[0003] The purpose of the utility model is to provide a product with a simple structure that can dissipate heat from the parts inside the grass cutting head without the need to stop for rest.

[0004] The purpose of the utility model is achieved as follows:

[0005] A heat dissipation structure of a grass cutting head includes a machine head main body. A driving motor and a transmission shaft are respectively arranged inside the machine head main body. The driving motor is directly or indirectly connected to the rotating shaft. A heat dissipation disc and a clamping disc are arranged at the lower end of the transmission shaft. A saw blade is installed between the heat dissipation disc and the clamping disc. The heat dissipation disc, the saw blade, and the clamping disc can rotate synchronously with the transmission shaft. A plurality of fan blade parts are arranged on the heat dissipation disc. An air ventilation channel is formed by concave separation between adjacent fan blade parts. A ventilation part penetrates through the machine head main body from top to bottom. The ventilation part is communicated with the air ventilation channel. When the saw blade rotates, wind can be generated and enter the air ventilation channel to take away the heat generated inside the machine head main body.

[0006] Further, the ventilation part is arranged around the outside of the machine head main body. A plurality of partition plates are arranged at intervals on the ventilation part. The fan blade parts are arranged around the outside of the heat dissipation disc.

[0007] Further, the fan blade parts are arranged vertically. An air discharge port is formed at the upper end of adjacent fan blade parts. A connecting part is arranged at the lower end of adjacent fan blade parts.

[0008] Further, a speed reduction device is also arranged inside the machine head main body. The speed reduction device includes a sun gear, a plurality of planetary gears, and an internal gear ring. The sun gear and the planetary gears are both arranged inside the internal gear ring. The two ends of the planetary gears are respectively meshed with the internal gear ring and the sun gear. The sun gear is connected to the driving motor. When the driving motor rotates, the planetary gears can be driven to rotate by the sun gear. A hoop part is also arranged at the rear end of the machine head main body.

[0009] The prominent and beneficial technical effects of the present utility model compared with the prior art are as follows:

[0010] The present utility model is a heat dissipation structure for a grass trimmer head. Most of the front ends of the previous grass trimmer heads were smooth cylinders, with a drive motor, a reduction gearbox, a rotating shaft for driving the saw blade, etc. arranged inside. Some grass trimmer heads would add more parts for driving in order to increase the rotational speed or working efficiency. When all these parts were stacked in one space, a large amount of heat was generated. If the machine did not stop in time for heat dissipation, the parts would be damaged after a long time. In the present utility model, a heat dissipation disk is arranged at the lower end of the transmission shaft, and a plurality of fan blade parts are arranged on the heat dissipation disk. A ventilation channel is formed by the plurality of fan blade parts and is communicated with the ventilation part on the main body of the machine head. When the heat dissipation disk rotates, a rotating wind force can be generated. At this time, there is a negative pressure difference between the spaces at the upper end of the main body of the machine head and the heat dissipation disk. Thus, the rotating wind force can flow in the ventilation channel and penetrate through the gaps between the parts to dissipate heat from the working parts, enabling the drive motor to still feel the wind force even when it is turned on for a long time. Compared with the previous closed main body of the machine head, the present utility model greatly increases the wind force through the fan blade parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a perspective view of the present utility model.

[0012] Figure 2 is an exploded view of the present utility model.

[0013] Figure 3 is a schematic view of the present utility model after installing the saw blade.

[0014] Figure 4 is a perspective view of the reduction device of the present utility model.

[0015] Figure 5 is a top view of the present utility model.

[0016] Figure 6 is a top view of the main body of the machine head of the present utility model.

[0017] Figure 7 is a schematic view of the heat dissipation disk and the clamping disk of the present utility model.

[0018] The meanings represented by the reference numerals in the drawings are as follows:

[0019] 1 - Main body of the machine head; 2 - Drive motor; 3 - Transmission shaft; 4 - Reduction device; 5 - Ventilation channel;

[0020] 6 - Saw blade; 7 - Fan blade part; 8 - Ventilation part; 9 - Sun gear; 10 - Planet gear; 11 - Internal gear ring; 12 - Hoop part; 13 - Heat dissipation disk; 14 - Clamping disk; 15 - Air outlet; 16 - Connection part. Detailed implementation manners

[0021] The present utility model will be further described below in conjunction with specific embodiments:

[0022] A heat dissipation structure of a grass trimmer head, including a machine head main body 1. A driving motor 2 and a transmission shaft 3 are respectively arranged in the machine head main body 1. The driving motor 2 is directly or indirectly connected to the rotating shaft. A heat dissipation disk 13 and a clamping disk 14 are arranged at the lower end of the transmission shaft 3. A saw blade 6 is installed between the heat dissipation disk 13 and the clamping disk 14. The heat dissipation disk 13, the saw blade 6 and the clamping disk 14 can rotate synchronously with the transmission shaft 3. A plurality of fan blade parts 7 are arranged on the heat dissipation disk 13. An air ventilation channel 5 is recessed and separated between adjacent fan blade parts 7. A ventilation part 8 penetrates through the machine head main body 1 from top to bottom. The ventilation part 8 is communicated with the air ventilation channel 5. When the saw blade 6 rotates, wind power can be generated and enter the air ventilation channel 5 to take away the heat generated in the machine head main body 1.

[0023] The present utility model is a heat dissipation structure of a grass trimmer head. Most of the front ends of the previous grass trimmer heads were smooth cylinders, and a driving motor 2, a reduction gearbox and a rotating shaft for driving the saw blade 6 to rotate were arranged inside. Some grass trimmer heads would add more parts for driving in order to increase the rotation speed or working efficiency. When all these parts were stacked in one space, a large amount of heat was generated. If not stopped in time for heat dissipation, the parts would be damaged after a long time. The present utility model arranges a heat dissipation disk 13 at the lower end of the transmission shaft 3, and a plurality of fan blade parts 7 are arranged on the heat dissipation disk 13. An air ventilation channel 5 is formed by the plurality of fan blade parts 7 and is communicated with the ventilation part 8 on the machine head main body 1. When the heat dissipation disk 13 rotates, a rotating wind power can be generated. At this time, there is a negative pressure difference between the space at the upper end of the machine head main body 1 and the heat dissipation disk 13. Thus, the rotating wind power can flow in the air ventilation channel 5 and penetrate through the gaps between the parts to dissipate heat from the working parts. Even when the driving motor 2 is turned on for a long time, wind power can still be felt. Compared with the previous closed machine head main body 1, the present utility model greatly increases the wind power through the fan blade parts 7. <>

[0024] Preferably, the ventilation part 8 is arranged around the machine head main body 1, and a plurality of partition plates are arranged on the ventilation part 8 at intervals. The fan blade parts 7 are arranged around the heat dissipation disk 13. The present utility model arranges the ventilation part 8 outside the machine head main body 1, and utilizes the shape of the machine head main body 1 to achieve the ventilation effect from outside to inside. Compared with arranging it inside the machine head main body 1, the generated wind power is greater. The circumferential arrangement can also generate greater wind power with the rotation of the saw blade 6. The partition plates in the ventilation part 8 can make the wind power flow orderly, similar to a fan, making the surrounding air circulate better, so that the wind can flow smoothly in the air ventilation channel 5.

[0025] Preferably, the blade part 7 is arranged vertically. An air outlet 15 is formed at the upper end of adjacent blade parts 7. A connecting part 16 is connected to the lower end of adjacent blade parts 7. The ventilation channel 5 is communicated with the ventilation part 8 through the air outlet 15, so that the generated wind can enter the gap to dissipate heat from the parts and then be discharged to replace and circulate the air outside. The connecting part 16 at the lower end facilitates the ventilation channel 5 to return the wind into the ventilation channel 5 to continuously circulate and dissipate heat from the parts in the machine head main body 1.

[0026] Preferably, a speed reduction device 4 is further provided in the machine head main body 1. The speed reduction device 4 includes a sun gear 9, a plurality of planetary gears 10 and an internal gear ring 11. The sun gear 9 and the planetary gears 10 are both arranged in the internal gear ring 11. The two ends of the planetary gears 10 are respectively meshed with the internal gear ring 11 and the sun gear 9. The sun gear 9 is connected to the driving motor 2. The driving motor 2 can drive the planetary gears 10 to rotate through the sun gear 9. A hoop part 12 is further provided at the rear end of the machine head main body 1. The planetary gear 10 transmission method is adopted for transmission, achieving a higher transmission ratio, increasing torque output, improving the overall torque transmission ability, having higher efficiency, being compact in design, simple in structure. And compared with the complex parts in the internal space of the current lawn mower, the previous method of driving a large gear with a small gear brought a small torque with a large space. The transmission method of the present invention has a smaller volume and weight, is suitable for a limited installation space, brings a larger torque, and the output rotational speed is more stable. The hoop part 12 at the rear end can connect the grass cutting head to the extension handle.

[0027] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat dissipation structure for a grass trimmer head, comprising a machine head main body (1), characterized in that, A driving motor (2) and a transmission shaft (3) are respectively arranged in the headstock body (1). The driving motor (2) is directly or indirectly connected to the rotating shaft. A heat dissipation disc (13) and a clamping disc (14) are arranged at the lower end of the transmission shaft (3). A saw blade (6) is installed between the heat dissipation disc (13) and the clamping disc (14). The heat dissipation disc (13), the saw blade (6) and the clamping disc (14) can rotate synchronously with the transmission shaft (3). A plurality of blade parts (7) are arranged on the heat dissipation disc (13). A ventilation channel (5) is recessed and separated between adjacent blade parts (7). A ventilation part (8) penetrates through the headstock body (1) from top to bottom. The ventilation part (8) is communicated with the ventilation channel (5). When the saw blade (6) rotates, wind can be generated and enter the ventilation channel (5) to take away the heat generated in the headstock body (1).

2. The heat dissipation structure of a grass trimmer head according to claim 1, characterized in that: The ventilation part (8) is arranged around the headstock body (1). A plurality of partition plates are arranged on the ventilation part (8) at intervals. The blade parts (7) are arranged around the heat dissipation disc (13).

3. The heat dissipation structure of a grass trimming head according to claim 1, characterized in that: The blade parts (7) are arranged vertically. An air outlet (15) is formed at the upper end of adjacent blade parts (7). A connecting part (16) is connected to the lower end of adjacent blade parts (7).

4. A heat dissipation structure for a grass trimmer head according to any one of claims 1 to 3, characterized in that: A speed reduction device (4) is further arranged in the headstock body (1). The speed reduction device (4) includes a sun gear (9), a plurality of planet gears (10) and an internal gear ring (11). The sun gear (9) and the planet gears (10) are both arranged in the internal gear ring (11). The two ends of the planet gears (10) are respectively meshed with the internal gear ring (11) and the sun gear (9). The sun gear (9) is connected to the driving motor (2). When the driving motor (2) rotates, the planet gears (10) can be driven to rotate through the sun gear (9). A hoop part (12) is further arranged at the rear end of the headstock body (1).

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