A power motor for a weeding machine

Abstract

This invention relates to the field of electric motors and discloses a power motor for a weed cutter. The motor includes a motor housing and a motor shaft rotatably mounted on the housing. The rear end of the motor housing has several sets of heat dissipation vents communicating with the interior of the housing, arranged in a ring array. The motor also includes a sealing mechanism and a centrifugal transmission mechanism located at the rear end of the motor housing. The sealing mechanism includes several sealing components arranged in a ring array, each corresponding to a set of heat dissipation vents. These components are slidably mounted on the rear end face of the motor housing and can seal / open the heat dissipation vents. By incorporating the sealing mechanism and centrifugal transmission mechanism, this invention allows the heat dissipation vents to be opened by the rotational movement of the motor shaft when the motor starts, and to automatically close when the motor is powered off. This achieves both heat dissipation and reduces the impact of external impurities on the motor.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to a power motor for a weed cutter. Background Technology

[0002] The electric motor is the core power component of a motorized lawnmower. When a lawnmower is working, its motor rotates at a very high speed and usually operates continuously for a long time, causing the motor to heat up significantly. However, existing lawnmower motors have relatively poor heat dissipation.

[0003] To address the aforementioned issues, patent application number 202120926082.8 discloses a novel weed cutter motor, comprising a body, a drive shaft at the bottom of the body, a top cover at the top of the body, the top cover and the body being connected together by bolts, a plurality of mounting openings evenly distributed on the upper surface of the body, a vent plate being installed inside the mounting openings by bolts, and a plurality of connecting parts evenly distributed on the arc surface of the body, the connecting parts being connected together with the body by bolts.

[0004] The aforementioned patent facilitates rapid heat dissipation from the motor by incorporating heat dissipation vents and ventilation plates. However, the working environment of a weed cutter contains a significant amount of dust, particulate matter, and other impurities. If the heat dissipation vents remain connected to the outside environment for extended periods, these impurities can easily clog the ventilation plates. Furthermore, small impurities can easily enter the motor through the heat dissipation vents and ventilation plates, leading to motor damage. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a power motor for a weed cutter, which solves the problem mentioned in the background art that if the heat dissipation vent keeps the inside of the motor connected to the outside for a long time, impurities can easily clog the ventilation plate, and small impurities can also easily enter the inside of the motor through the heat dissipation vent and ventilation plate, leading to motor damage.

[0006] The present invention solves the above-mentioned technical problems through the following technical means:

[0007] A power motor for a weed cutter includes a motor housing and a motor shaft rotatably mounted on the motor housing. The rear end of the motor housing has several sets of heat dissipation vents communicating with the interior of the motor housing. These vents are arranged in a ring array. The motor also includes a sealing mechanism and a centrifugal transmission mechanism disposed at the rear end of the motor housing. The sealing mechanism includes several sealing components arranged in a ring array, each corresponding to a set of heat dissipation vents. The sealing components are slidably mounted on the rear end face of the motor housing and are capable of sealing / opening the heat dissipation vents. The centrifugal transmission mechanism includes a connecting ring and several centrifugal motion components. The connecting ring is fixed to the rear end of the motor shaft. The centrifugal motion components are arranged in a ring array and connected to the connecting ring. When the centrifugal motion components are driven by the motor shaft to perform centrifugal motion, they can drive the sealing components to open the heat dissipation vents. When not in a centrifugal motion state, the centrifugal motion components can drive the sealing components to seal the heat dissipation vents.

[0008] Furthermore, the sealing assembly includes a sealing plate with a through hole adapted to the heat dissipation vent. A sliding plate is fixed to one end of the sealing plate, and a sliding groove adapted to the sliding plate is provided on the rear end face of the motor housing. Part of the sliding plate is slidably installed in the sliding groove. When the sliding plate slides along the movement trajectory of the sliding groove to the end near the motor shaft, the sealing plate completely seals the heat dissipation vent. When the sliding plate slides along the movement trajectory of the sliding groove to the end away from the motor shaft, the through hole of the sealing plate coincides with the heat dissipation vent, and the heat dissipation vent is fully opened.

[0009] Furthermore, the centrifugal motion assembly includes a fixed rod, a centrifugal rod, and a compression spring; one end of the fixed rod is fixed to a connecting ring; one end of the centrifugal rod has a blind hole, and one end of the fixed rod is installed in the blind hole of the centrifugal rod, so that the centrifugal rod is slidably installed on the fixed rod along its own length; the compression spring is sleeved on the fixed rod, and a first baffle is fixed to the end of the fixed rod away from the connecting ring; a second baffle is fixed to the open end of the centrifugal rod at the blind hole; one end of the compression spring abuts against the first baffle, and the other end of the compression spring abuts against the second baffle.

[0010] Furthermore, the centrifugal motion assembly also includes a centrifugal transmission unit, which is fixed on the centrifugal rod; the sealing assembly also includes an arc-shaped plate, which is fixed on the end of the sliding plate away from the sealing plate, and the arc-shaped plate is provided with an arc-shaped groove. The arc-shaped grooves of all the arc-shaped plates together form a motion track, and part of the structure of the centrifugal transmission unit is movably installed in the motion track.

[0011] Furthermore, the centrifugal transmission unit includes a connecting rod, one end of which is fixed to the lower side of the centrifugal rod, and the other end of the centrifugal rod is fixed to a mounting rod. Several connecting shafts are fixed to the lower side of the mounting rod, and a rotating wheel is rotatably mounted on the connecting shaft. The rotating wheel is movably mounted in the motion track, and the outer circumferential wall of the rotating wheel can abut against the side wall of the arc-shaped groove.

[0012] Furthermore, the width of the arc-shaped groove is greater than the diameter of the wheel, and the widths of both the inlet and outlet ends of the arc-shaped groove are greater than the width of the middle part of the arc-shaped groove.

[0013] Furthermore, the sealing mechanism also includes several sealing transmission components, each of which is disposed between two adjacent sealing plates. Each sealing transmission component includes a first transmission gear and a second transmission gear, both of which are rotatably mounted on the rear end face of the motor housing and mesh with each other. A first transmission rack and a second transmission rack are respectively fixed at both ends of the sealing plate. The first transmission rack meshes with the first transmission gear of the sealing transmission component on the same side, and the second transmission rack meshes with the second transmission gear of the sealing transmission component on the same side.

[0014] Furthermore, the centrifugal motion assembly also includes fan blades, which are fixed on the end of the centrifugal rod away from the connecting ring. The airflow direction of the fan blades is from the front end of the motor to the rear end of the motor. Several heat dissipation fins are fixed on the motor housing, and a protective cover is fitted over the outside of the motor housing. The front end of the protective cover is open, and several ventilation holes are opened at the rear end of the protective cover.

[0015] Furthermore, an air inlet dustproof mesh cover is installed between the front end of the protective cover and the motor housing.

[0016] Furthermore, each heat dissipation and dustproof mesh cover is installed in the motor housing.

[0017] The beneficial effects of this invention are:

[0018] Through the cooperation of the sealing mechanism and the centrifugal transmission mechanism, when the motor starts and drives the motor shaft to rotate at high speed, it can drive all the centrifugal motion components to perform centrifugal motion together through the connecting ring. Then, the centrifugal force generated by all the centrifugal motion components drives all the sealing components to slide, thereby opening all the heat dissipation vents and allowing the heat generated inside the motor to be dissipated smoothly, improving the motor's heat dissipation performance. When the motor shaft stops rotating, the centrifugal motion components are in a non-centrifugal motion state. In this state, all the centrifugal motion components can drive all the sealing components to seal all the heat dissipation vents, preventing some impurities from entering the motor through the heat dissipation vents and reducing the risk of motor damage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the motor structure in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the motor without its protective cover in an embodiment of the present invention;

[0021] Figure 3 This is the present invention. Figure 2 An exploded view of part of the structure;

[0022] Figure 4 This is a schematic diagram illustrating the structure of the rear end of the motor housing in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the sealing component in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the centrifugal motion component in an embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the centrifugal motion component in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram illustrating the structure of the sealing component and the centrifugal motion component in an embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram illustrating the structure of the heat dissipation vent in the open state in an embodiment of the present invention;

[0028] The components include: 1. Motor housing; 11. Heat dissipation vent; 12. Heat dissipation and dustproof mesh cover; 14. Slide groove; 15. Heat dissipation fins; 2. Motor shaft; 3. Sealing assembly; 31. Sealing plate; 311. Through hole; 312. First transmission rack; 313. Second transmission rack; 32. Sliding plate; 33. Arc plate; 331. Arc groove; 332. Inlet end; 333. Outlet end; 334. Middle section; 4. Connecting ring; 5. Centrifugal motion assembly. Components; 51. Fixing rod; 511. First baffle; 52. Centrifugal rod; 521. Blind hole; 522. Second baffle; 53. Compression spring; 54. Centrifugal transmission part; 541. Connecting rod; 542. Mounting rod; 543. Connecting shaft; 544. Rotary wheel; 55. Fan blade; 6. Sealing transmission assembly; 61. First transmission gear; 62. Second transmission gear; 7. Protective cover; 71. Ventilation hole; 8. Air inlet dustproof mesh cover. Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 9 As shown in the embodiment of this application, a power motor for a weed cutter is provided. It not only has good heat dissipation performance, but also makes it difficult for external impurities to enter the motor. It has good overall performance and is suitable for weed cutters.

[0031] like Figure 3 and Figure 4 As shown, specifically, the motor includes a motor housing 1 and a motor shaft 2 rotatably mounted on the motor housing 1. In addition, the motor housing 1 contains components such as a stator and rotor, which will not be described in detail in this embodiment. Several sets of heat dissipation vents 11 are provided at the rear end of the motor housing 1. These vents 11 connect the interior of the motor housing 1 to the outside, enabling rapid heat dissipation within the motor. In this embodiment, five sets of heat dissipation vents 11 are specifically provided, arranged in a circular array at the rear end of the motor housing 1. Each set of heat dissipation vents 11 includes two rectangular heat dissipation vents 11 arranged in parallel.

[0032] like Figure 2 and Figure 3 As shown, in this embodiment, the motor also includes a sealing mechanism and a centrifugal transmission mechanism. The sealing mechanism is mainly used to seal / open all the heat dissipation vents 11. The centrifugal transmission mechanism mainly uses the high-speed rotation of the motor shaft 2 to generate centrifugal motion, and then uses the centrifugal force generated by the centrifugal motion to act on the sealing mechanism to control the sealing mechanism to open all the heat dissipation vents 11. When the motor shaft 2 does not rotate, the centrifugal transmission mechanism does not generate centrifugal force and can control the sealing mechanism to seal all the heat dissipation vents 11.

[0033] like Figure 2 , Figure 3 and Figure 9As shown, specifically, the sealing mechanism includes several sealing components 3, specifically five, arranged in a ring array. Each sealing component 3 corresponds to a set of heat dissipation vents 11. The sealing components 3 are slidably mounted on the rear end face of the motor housing 1, and the sliding trajectory of the sealing component 3 coincides with the extension line of the radius of the motor shaft 2. When the sealing component 3 slides to a certain position, it can seal / open the corresponding heat dissipation vent 11. The five sealing components 3 cooperate with each other to seal / open all the heat dissipation vents 11. The centrifugal transmission mechanism includes a connecting ring 4 and several centrifugal motion components 5. The connecting ring 4 is fixed on the rear end of the motor shaft 2 and is driven to rotate by the motor shaft 2. The centrifugal motion components 5 are arranged in a ring array and connected to the connecting ring 4, with the number of centrifugal motion components 5 being greater than or equal to five. When the motor starts and drives the motor shaft 2 to rotate at high speed, it can drive all the centrifugal motion components 5 to perform centrifugal motion together through the connecting ring 4. Then, the centrifugal force generated by all the centrifugal motion components 5 drives all the sealing components 3 to slide, thereby opening all the heat dissipation vents 11, so that the heat generated inside the motor can be dissipated smoothly, improving the heat dissipation performance of the motor. When the motor shaft 2 stops rotating, the centrifugal motion components 5 are in a non-centrifugal motion state. In this state, all the centrifugal motion components 5 can drive all the sealing components 3 to seal all the heat dissipation vents 11, preventing some impurities from entering the motor through the heat dissipation vents 11 and reducing the risk of motor damage.

[0034] like Figure 3 and Figure 4 As shown, in this embodiment, a heat dissipation and dustproof mesh cover 12 is installed inside each heat dissipation port 11 of the motor housing 1. With this arrangement, when the motor is working and the heat dissipation port 11 is opened, the entry of impurities into the motor can be reduced, thereby reducing the risk of motor damage.

[0035] like Figure 4 and Figure 5As shown, in this embodiment, the sealing assembly 3 includes a sealing plate 31. The sealing plate 31 has two through holes 311 that are adapted to the heat dissipation vents 11. Both through holes 311 are rectangular and correspond to two rectangular heat dissipation vents 11 in a set of heat dissipation vents 11. The area of ​​the through holes 311 can be slightly larger than the area of ​​the heat dissipation vents 11. A sliding plate 32 is fixed to one end of the sealing plate 31. A sliding groove 14 adapted to the sliding plate 32 is provided on the rear end face of the motor housing 1. The movement trajectory of the sliding groove 14 coincides with the extension line of the radius of the motor shaft 2. Part of the structure of the sliding plate 32 is slidably installed in the sliding groove 14. By limiting the position of the sliding groove 14, the sliding plate 32 can slide along the movement trajectory of the sliding groove 14 to the end closer to the motor shaft 2 or away from the end closer to the motor shaft 2. When the sliding plate 32 slides along the movement trajectory of the slide groove 14 to the end near the motor shaft 2, the through hole 311 of the sealing plate 31 does not overlap with the heat dissipation port 11, and the sealing plate 31 can completely block the heat dissipation port 11. When the sliding plate 32 slides along the movement trajectory of the slide groove 14 to the end away from the motor shaft 2, the through hole 311 of the sealing plate 31 overlaps with the heat dissipation port 11, and the heat dissipation port 11 can be completely opened.

[0036] like Figure 6 and Figure 7 As shown, in this embodiment, the centrifugal motion assembly 5 includes a fixed rod 51, a centrifugal rod 52, and a compression spring 53. One end of the fixed rod 51 is fixed to the connecting ring 4, and the length direction of the fixed rod 51 coincides with the extension line of the radius of the motor shaft 2. One end of the centrifugal rod 52 has a blind hole 521, and the end of the fixed rod 51 away from the connecting ring 4 is installed in the blind hole 521 of the centrifugal rod 52, so that the centrifugal rod 52 slides on the fixed rod 51 along its own length direction. The compression spring 53 is sleeved on the rod surface of the fixed rod 51 located in the blind hole 521. In order to facilitate the installation of the compression spring 53, a first baffle 511 is fixed to the end of the fixed rod 51 away from the connecting ring 4, and a second baffle 522 is fixed to the open end of the centrifugal rod 52 at the blind hole 521. One end of the compression spring 53 abuts against the first baffle 511, and the other end of the compression spring 53 abuts against the second baffle 522. When the motor shaft 2 drives the connecting ring 4 to rotate at high speed, all the centrifugal motion components 5 will also rotate at high speed around the axis of the motor shaft 2. At this time, under the action of centrifugal force, the centrifugal rod 52 will overcome the elastic force of the compression spring 53 and slide away from the end of the motor shaft 2 to perform centrifugal motion. When the motor shaft 2 does not drive the connecting ring 4 to rotate, all the centrifugal motion components 5 will not perform centrifugal motion. At this time, under the action of the elastic force of the compression spring 53, the centrifugal rod 52 will move towards the end closer to the motor shaft 2, thereby resetting the centrifugal rod 52.

[0037] like Figure 5 , Figure 6 and Figure 8As shown, in this embodiment, in order for all centrifugal motion components 5 to drive all sealing components 3 to move together, the centrifugal motion component 5 also includes a centrifugal transmission part 54, which is fixed on the centrifugal rod 52 and can move centrifugally together with the centrifugal rod 52. The sealing component 3 also includes an arc plate 33, which is fixed to the end of the sliding plate 32 away from the sealing plate 31. The arc plate 33 has an arc groove 331, and the arc grooves 331 of all the arc plates 33 together form a motion track. The shape of the motion track is close to a circular track, and some structures of all the centrifugal transmission parts 54 are movably installed in the motion track. When the motor shaft 2 rotates at high speed, all the centrifugal rods 52 can drive the centrifugal transmission part 54 fixed to them to move centrifugally together. That is, the centrifugal transmission part 54 can rotate at high speed around the axis of the motor shaft 2 and move away from the motor shaft 2. Then, through the cooperation of all the centrifugal transmission parts 54 and the motion track, all the arc plates 33 are pushed to move away from the motor shaft 2, thereby driving the sealing plate 31 to move away from the motor shaft 2. When the sealing plate 31 moves to the end of the motion trajectory, that is, when the sealing plate 31 fully opens the heat dissipation port 11, the entire sealing assembly 3 is restricted by the position and stops moving, which can also prevent the centrifugal motion assembly 5 from continuing to perform centrifugal motion.

[0038] It should be noted that in this embodiment, since the number of centrifugal motion components 5 is greater than or equal to the number of sealing components 3, all centrifugal motion components 5 can work together to smoothly act on all sealing components 3.

[0039] In this embodiment, when all the centrifugal motion components 5 are in a non-centrifugal motion state, all the arc-shaped plates 33 do not move away from the motor shaft 2. In this state, all the arc-shaped plates 33 can be connected to each other, making the motion track composed of all the arc-shaped grooves 331 a continuous and complete track. However, when all the centrifugal motion components 5 are in a centrifugal motion state, all the arc-shaped plates 33 will move away from the motor shaft 2. In this state, all the arc-shaped plates 33 will separate from each other, causing gaps between adjacent arc-shaped grooves 331, thus making the entire motion track a discontinuous track. In this case, when all the centrifugal transmission parts 54 move within the discontinuous motion track, one of the centrifugal transmission parts 54 may derail.

[0040] To solve the above-mentioned derailment problem, such as Figure 6 , Figure 7 and Figure 8As shown, the centrifugal transmission unit 54 in this embodiment includes a connecting rod 541. The upper end of the connecting rod 541 is fixed to the lower side of the centrifugal rod 52, and the other lower end of the centrifugal rod 52 is fixed with a mounting rod 542. The mounting rod 542 has an arc-shaped structure, and the arc trajectory of the mounting rod 542 is the same as the arc trajectory of the arc groove 331. Several connecting shafts 543 are fixed to the lower side of the mounting rod 542. The several connecting shafts 543 are arranged at equal intervals along the arc trajectory of the mounting rod 542. In this embodiment, the number of connecting shafts 543 is specifically two. A rotating wheel 544 is rotatably mounted on the connecting shaft 543, and a rubber layer is sleeved on the outer circumferential wall of the rotating wheel 544. All the rotating wheels 544 are movably mounted in the motion track, and the outer circumferential wall of the rotating wheel 544 can abut against the side wall of the arc groove 331. Here, the side wall can be the side wall of the arc groove 331 that is close to the motor shaft 2 or far away from the motor shaft 2. This design allows multiple rollers 544 to be mounted on a single centrifugal drive unit 54. The distance between the connected rollers 544 compensates for the gaps between adjacent arc-shaped grooves 331. Even if one roller 544 moves into the gap between two arc-shaped grooves 331, as long as the other rollers 544 remain within one arc-shaped groove 331, the entire centrifugal drive unit 54 will not detach from its motion track. Furthermore, the cooperation between the rollers 544 and the motion track reduces wear between the centrifugal drive unit 54 and the motion track, extending the service life of the centrifugal drive unit 54.

[0041] like Figure 5 and Figure 8 As shown, in this embodiment, since all the sealing components 3 move within a small range, i.e., slide towards or away from the motor shaft 2, the stroke of the movement depends on the width of the heat dissipation vent 11. The arc-shaped plate 33 also moves along with it. Therefore, the motion track composed of all the arc-shaped grooves 331 is not a true circular track, but only a track close to a circle. However, the motion trajectory of all the rotating wheels 544 in the centrifugal transmission unit 54 is a true circular trajectory, resulting in a certain trajectory error between the motion trajectory of the rotating wheels 544 and the trajectory of the motion track. To minimize the impact of this trajectory error and ensure smooth movement of the rotor 544 within the track, this embodiment sets the width of the arc-shaped groove 331 to be greater than the diameter of the rotor 544. Furthermore, the widths of both the inlet end 332 and the outlet end 333 of the arc-shaped groove 331 are set to be greater than the width of the middle portion 334 of the arc-shaped groove 331. The width of the arc-shaped groove 331 gradually widens from the middle portion 334 to the inlet end 332, and also gradually widens from the middle portion 334 to the outlet end 333. This design reduces the impact of trajectory error on the movement of the rotor 544.

[0042] like Figure 2As shown, in this embodiment, the sealing mechanism also includes several sealing transmission components 6. Specifically, there are five sealing transmission components 6, each of which is disposed between two adjacent sealing plates 31. Through these five sealing transmission components 6, all sealing components 3 can move simultaneously and in the same direction, thereby ensuring the synchronicity of the movement of all sealing components 3. When the movement of all sealing components 3 is synchronized, the deviation of all centrifugal transmission parts 54 in the movement track will be reduced, and the movement of the entire centrifugal transmission mechanism will be smoother.

[0043] like Figure 2 As shown, specifically, the sealing transmission assembly 6 includes a first transmission gear 61 and a second transmission gear 62. Both the first transmission gear 61 and the second transmission gear 62 are rotatably mounted on the rear end face of the motor housing 1 via a rotating shaft, and the first transmission gear 61 and the second transmission gear 62 within the same sealing transmission assembly 6 mesh with each other. A first transmission rack 312 and a second transmission rack 313 are fixed to both ends of the sealing plate 31, respectively. The length directions of the first transmission rack 312 and the second transmission rack 313 are parallel to the movement trajectory of the sealing plate 31. The first transmission rack 312 meshes with the first transmission gear 61 of the sealing transmission assembly 6 on the same side, and the second transmission rack 313 meshes with the second transmission gear 62 of the sealing transmission assembly 6 on the same side. This design ensures that the movement of all sealing assemblies 3 is synchronized, thereby making the movement of the entire centrifugal transmission mechanism smoother.

[0044] like Figure 1 , Figure 2 and Figure 6 As shown, in this embodiment, the centrifugal motion assembly 5 also includes fan blades 55, which are fixed to the end of the centrifugal rod 52 away from the connecting ring 4. When the motor shaft 2 rotates at high speed, driving all the fan blades 55 to rotate, the airflow direction of the fan blades 55 is from the front end to the rear end of the motor, preventing the airflow from heading towards the heat dissipation port 11 and blowing impurities into the heat dissipation port 11. At the same time, it can also quickly remove the heat emitted from the heat dissipation port 11, improving the heat dissipation performance of the motor. In addition, several heat dissipation fins 15 are fixed on the motor housing 1, and a protective cover 7 is fitted on the outside of the motor housing 1. The front end of the protective cover 7 is open, and the protective cover 7 can completely protect the heat dissipation fins 15, the sealing mechanism, and the centrifugal transmission mechanism. Several ventilation holes 71 are opened at the rear end of the protective cover 7. The air generated by the fan blades 55 can enter from the gap between the front end of the protective cover 7 and the motor housing 1, and then exit from the ventilation holes 71 at the rear end of the protective cover 7, thereby removing the heat on the heat dissipation fins 15 and the heat emitted from the heat dissipation port 11, thereby further improving the heat dissipation performance of the motor.

[0045] like Figure 1 and Figure 2As shown, in this embodiment, an air inlet dustproof mesh cover 8 is installed between the front end of the protective cover 7 and the motor housing 1. With this design, when the fan blades 55 rotate to generate wind, the air inlet dustproof mesh cover 8 can block most impurities, reducing the possibility of impurities contaminating the outer wall of the motor housing 1, the heat dissipation fins 15, the inner wall of the protective cover 7, the sealing mechanism, and the centrifugal transmission mechanism.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A power motor for a weeding machine, comprising a motor housing (1) and a motor shaft (2) rotatably mounted on the motor housing (1), wherein the rear end of the motor housing (1) is provided with a plurality of heat dissipation vents (11) communicating with the interior of the motor housing (1), and the plurality of heat dissipation vents (11) are arranged in a ring array structure, characterized in that, The motor also includes a sealing mechanism and a centrifugal transmission mechanism disposed at the rear end of the motor housing (1); the sealing mechanism includes a plurality of sealing components (3), which are arranged in a ring array structure, each of the sealing components (3) corresponding to a set of heat dissipation vents (11), the sealing components (3) are slidably mounted on the rear end face of the motor housing (1), and the sealing components (3) can block / open the heat dissipation vents (11); the centrifugal transmission mechanism includes a connecting ring (4) and a plurality of centrifugal motion components (5), the connecting ring (4) being fixed on the rear end of the motor shaft (2), and the plurality of centrifugal motion components (5) being arranged in a ring array structure. And connected to the connecting ring (4), the centrifugal motion component (5) can drive the sealing component (3) to open the heat dissipation port (11) when it is driven by the motor shaft (2) to perform centrifugal motion, and the centrifugal motion component (5) can drive the sealing component (3) to block the heat dissipation port (11) when it is not in centrifugal motion state; the sealing component (3) includes a sealing plate (31), the sealing plate (31) is provided with a through hole (311) adapted to the heat dissipation port (11), a sliding plate (32) is fixed at one end of the sealing plate (31), and a sliding groove (14) adapted to the sliding plate (32) is provided on the rear end face of the motor housing (1), and the part of the sliding plate (32) is provided with a sliding groove (14) adapted to the sliding plate (32). The sliding plate (32) is installed in the slide groove (14) in a separate structure. When the sliding plate (32) slides along the movement trajectory of the slide groove (14) to the end near the motor shaft (2), the sealing plate (31) completely seals the heat dissipation port (11). When the sliding plate (32) slides along the movement trajectory of the slide groove (14) to the end away from the motor shaft (2), the through hole (311) of the sealing plate (31) coincides with the heat dissipation port (11), and the heat dissipation port (11) is fully opened. The centrifugal motion assembly (5) includes a fixed rod (51), a centrifugal rod (52), and a compression spring (53). One end of the fixed rod (51) is fixed to the connecting ring (4). The centrifugal rod (52) is fixed to the connecting ring (4). One end of the centrifugal rod (52) has a blind hole (521), and one end of the fixing rod (51) is installed in the blind hole (521) of the centrifugal rod (52), so that the centrifugal rod (52) is slidably installed on the fixing rod (51) along its own length direction; the compression spring (53) is sleeved on the fixing rod (51), and a first baffle (511) is fixed at the end of the fixing rod (51) away from the connecting ring (4), and a second baffle (522) is fixed at the open end of the centrifugal rod (52) in the blind hole (521). One end of the compression spring (53) abuts against the first baffle (511), and the other end of the compression spring (53) abuts against the second baffle (522).

2. The motor according to claim 1, characterized in that, The centrifugal motion assembly (5) also includes a centrifugal transmission part (54), which is fixed on the centrifugal rod (52); the sealing assembly (3) also includes an arc plate (33), which is fixed on the end of the sliding plate (32) away from the sealing plate (31). The arc plate (33) has an arc groove (331), and the arc grooves (331) of all the arc plates (33) together form a motion track. Part of the structure of the centrifugal transmission part (54) is movably installed in the motion track.

3. The motor according to claim 2, characterized in that, The centrifugal transmission unit (54) includes a connecting rod (541), one end of which is fixed to the lower side of the centrifugal rod (52), and the other end of the centrifugal rod (52) is fixed with a mounting rod (542). Several connecting shafts (543) are fixed to the lower side of the mounting rod (542). A rotating wheel (544) is rotatably mounted on the connecting shaft (543). The rotating wheel (544) is movably mounted in the motion track, and the outer circumferential wall of the rotating wheel (544) can abut against the side wall of the arc groove (331).

4. The motor according to claim 3, characterized in that, The width of the arc groove (331) is greater than the diameter of the wheel (544), and the widths of the inlet end (332) and outlet end (333) of the arc groove (331) are both greater than the width of the middle part (334) of the arc groove (331).

5. The motor according to claim 4, characterized in that, The sealing mechanism also includes several sealing transmission components (6), each of which is disposed between two adjacent sealing plates (31). Each sealing transmission component (6) includes a first transmission gear (61) and a second transmission gear (62). The first transmission gear (61) and the second transmission gear (62) are rotatably mounted on the rear end face of the motor housing (1), and the first transmission gear (61) and the second transmission gear (62) mesh with each other. The two ends of the sealing plate (31) are respectively fixed with a first transmission rack (312) and a second transmission rack (313). The first transmission rack (312) meshes with the first transmission gear (61) of the sealing transmission component (6) on the same side, and the second transmission rack (313) meshes with the second transmission gear (62) of the sealing transmission component (6) on the same side.

6. The motor according to claim 5, characterized in that, The centrifugal motion assembly (5) also includes fan blades (55), which are fixed on the end of the centrifugal rod (52) away from the connecting ring (4). The wind direction of the fan blades (55) is from the front end of the motor to the rear end of the motor. Several heat dissipation fins (15) are fixed on the motor housing (1). A protective cover (7) is provided on the outside of the motor housing (1). The front end of the protective cover (7) is open, and several ventilation holes (71) are provided at the rear end of the protective cover (7).

7. The motor according to claim 6, characterized in that, An air inlet dustproof mesh cover (8) is installed between the front end of the protective cover (7) and the motor housing (1).

8. The motor according to claim 1, characterized in that, The motor housing (1) is equipped with a heat dissipation and dustproof mesh cover (12) in each heat dissipation port (11).

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