Motor assembly for grass trimmer and grass trimmer head assembly thereof

Abstract

The utility model discloses a motor assembly for a grass trimmer and a machine head assembly of the grass trimmer, and belongs to the field of weeding machinery. An air inlet and an air outlet are formed in the two ends of a shell of the motor respectively; the motor is provided with a first output end at the air inlet, the motor is provided with a second output end at the air outlet, the first output end is provided with axial flow fan blades, and the second output end is provided with negative pressure fan blades; when the motor works, air is blown into the motor through the air inlet by the axial-flow fan blades, flows out of the air outlet after passing through the interior of the motor and is led out by the negative-pressure fan blades. The motor of the grass trimmer has the beneficial effect that the heat dissipation problem of the motor of the grass trimmer can be improved.

Description

Technical Field

[0001] The present application relates to the field of weeding machinery, and more particularly, to a motor assembly for a grass trimmer and a grass trimmer head assembly thereof. Background Art

[0002] A grass trimmer is a handheld tool used to cut weeds in lawns, gardens, pastures, etc. It can be divided into gasoline-powered and electric-powered types according to the power source, and can be divided into front-powered and rear-powered types according to the structure of the power head.

[0003] A grass trimmer mainly includes a handheld rod, a motor, a grass trimmer head, etc. The handheld rod has a control switch for controlling the motor. The cleaning work is completed by driving the grass trimmer head to rotate through the motor.

[0004] Since the motor generates heat during operation, it cannot work for a long time, otherwise it will cause the motor to overheat, resulting in burnout or reduced lifespan.

[0005] Currently, there is no motor for a grass trimmer that can improve motor heat generation. Summary of the Utility Model

[0006] This section of the present application is used to briefly introduce concepts, which will be described in detail in the following detailed implementation section. This section of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0007] To solve the technical problems mentioned in the above background art section, some embodiments of the present application provide a motor assembly for a grass trimmer, including:

[0008] A motor, with an air inlet and an air outlet respectively opened at both ends of the motor housing;

[0009] It is characterized in that: the motor has a first output end at the air inlet, the motor has a second output end at the air outlet, an axial flow fan blade is installed on the first output end, and a negative pressure fan blade is installed on the second output end; when the motor works, air is blown into the motor from the air inlet by the axial flow fan blade, flows through the inside of the motor, and then flows out from the air outlet and is drawn out by the negative pressure fan blade.

[0010] When the grass trimmer is working, the motor starts, the negative pressure fan blade rotates and generates negative pressure, so that air flows into the motor from the air inlet, flows through the inside of the motor, and then flows out through the air outlet; while the axial flow fan blade blows the air from the air inlet to the air outlet, thus playing a boosting role. Through the synergistic effect of the axial flow fan blade (blowing) and the negative pressure fan blade (sucking), the air aerodynamics is accelerated, thereby improving the cooling effect and thus solving the problem of motor heat generation.

[0011] A grass trimmer head assembly, comprising a motor assembly for a grass trimmer, a connecting plate mounted on a second output end, and a housing for mounting the motor. The negative pressure fan blade is located between the connecting plate and the motor.

[0012] The setting of the connecting plate enables air to finally move radially along the connecting plate, so that grass clippings are not easily introduced into the motor shaft.

[0013] Further, a protective frame is provided on the housing at the outer circle of the negative pressure fan blade. The protective frame has a hole structure for air to exit, and the negative pressure fan blade is arranged with a gap from the protective frame.

[0014] The protective frame mainly prevents the grass cut by the grass cutting head from entering the motor, and together with the connecting plate, ensures that grass clippings do not enter the motor shaft.

[0015] Further, the end face of the connecting plate close to the motor side has an inner concave structure, and the blade has a convex structure extending into the inner concave structure.

[0016] In this way, the connection area between the blade and the end face can be effectively increased, so that the blade is not easily bent and will not deform and lose its roundness during the high-speed rotation of the blade.

[0017] Further, the inner concave structure includes a first annular groove and a second annular groove. The first annular groove and the second annular groove are concentrically arranged and the diameter of the first annular groove is smaller than that of the second annular groove. The depth of the first annular groove is greater than that of the second annular groove.

[0018] Further, the housing includes a first half shell and a second half shell. The first half shell and the second half shell are spliced through a connecting component to form an installation cavity. The connecting component includes a bolt and a nut. The bolt passes through the first half shell and the second half shell and is connected to the nut.

[0019] By dividing the housing into two halves, it is convenient to install the motor.

[0020] Further, a gearbox is connected to the output shaft of the motor, and the second output end is connected to the output shaft of the gearbox.

[0021] Further, the connecting plate is provided with a first mounting hole and a second mounting hole. The first mounting hole is located at the center of the connecting plate, and at least two second mounting holes are provided and are evenly distributed in the circumferential direction around the first mounting hole.

[0022] The connection with the grass cutting head is realized through the first mounting hole and the second mounting hole, so that the connection between the connecting plate and the grass cutting head is firm.

[0023] Further, a reinforcing convex structure is provided at the second mounting hole.

[0024] Since the second mounting hole is opened near the edge, it will cause the part of the edge of the second mounting hole to be prone to cracking, so a reinforcing protrusion structure is provided.

[0025] The beneficial effects of this application are as follows: This application is used to improve the problem of motor heating and extend the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of this application, making other features, objectives, and advantages of this application more obvious. The schematic embodiments and descriptions of the drawings of this application are used to explain this application and do not constitute an improper limitation of this application.

[0027] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the elements and components are not necessarily drawn to scale.

[0028] In the drawings:

[0029] Figure 1 is the overall schematic diagram of Embodiment 1 of this application;

[0030] Figure 2 is the overall schematic diagram of Embodiment 2 of this application;

[0031] Figure 3 is the structural diagram of the axial flow fan blade;

[0032] Figure 4 is the structural diagram of the negative pressure fan blade and the connecting plate;

[0033] Figure 5 is the structural diagram of Embodiment 3;

[0034] Figure 6 is the structural diagram after hiding half of the housing in Embodiment 3;

[0035] Figure 7 is the structural diagram after hiding half of the housing in Embodiment 4;

[0036] Figure 8 is the structural diagram of Embodiment 5;

[0037] Figure 9 is the structural diagram of Embodiment 3 without the protective frame.

[0038] Reference Numerals:

[0039] 1. Motor; 11. Housing; 111. Air inlet; 112. Air outlet; 113. First output terminal; 114. Second output terminal; 2. Axial flow fan blade; 21. First connecting ring; 22. First blade; 3. Negative pressure fan blade; 31. Second connecting ring; 32. Second blade; 4. Protective shell; 5. Connecting plate; 51. First annular groove; 52. Second annular groove; 53. Protrusion structure; 54. First mounting hole; 55. Second mounting hole; 56. Reinforcing protrusion structure; 6. Housing; 61. First half shell; 62. Second half shell; 7. Protective frame; 71. Hole structure; 8. Air intake hole; 9. Air outlet; 10. Gearbox. Detailed implementation manners

[0040] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0041] In addition, it should be noted that for the sake of description, only parts related to the relevant utility model are shown in the drawings. Without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.

[0042] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependent relationships.

[0043] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive. Those skilled in the art should understand that unless clearly specified otherwise in the context, it should be understood as "one or more".

[0044] The present disclosure will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0045] Embodiment 1, a motor assembly for a lawn mower, as Figure 1 , includes a motor 1, and air inlets 111 and air outlets 112 are respectively formed at both ends of the housing 11 of the motor 1 along its axial direction.

[0046] The motor 1 has a first output end 113 at the air inlet 111 and a second output end 114 at the air outlet 112. To make the structure more compact, the first output end 113 and the second output end 114 are generally concentrically arranged, that is, their axis lines are on the same straight line. In fact, the first output end 113 and the second output end 114 can be arranged in segments or connected into one body. Such a motor 1 is generally a double-headed motor 1.

[0047] Such as Figure 3 An axial flow fan blade 2 is installed on the first output end 113. The axial flow fan blade 2 includes an integrally formed first connecting ring 21 and first blades 22. The first blades 22 are inclined (that is, the first blades 22 extend along both the axial direction and the circumferential direction of the first connecting ring 21), and the first blades 22 themselves have a certain curvature; a negative pressure fan blade 3 is installed on the second output end 114. The axial flow fan blade 2 can be directly exposed outside the housing 11. A protective housing 4 can also be provided on the housing 11, and the protective housing 4 wraps the axial flow fan blade 2 inside. The protective housing 4 can be integrally formed with the housing 11. When the protective housing 4 is provided, air inlet holes 8 need to be opened on the protective housing 4.

[0048] Such as Figure 4 , the negative pressure fan blade 3 includes a second connecting ring 31 and second blades 32. The second connecting ring 31 and the second blades 32 are integrally formed. The second blades 32 extend along the axial direction of the second connecting ring 31. The second blades 32 themselves have a certain curvature, that is, the second blades 32 do not extend linearly along the radial direction of the second connecting ring 31, but extend radially and bend outward along the second connecting ring 31.

[0049] When the motor 1 is started, the axial flow fan cools the rotor and stator inside the motor 1. The flow rate and flow path of the air decrease after passing through the housing 11 of the motor 1. The negative pressure fan blade 3 is used to accelerate and extend the air passing through the stator and rotor, improving the overall heat dissipation effect of the motor 1.

[0050] Embodiment 2: Such as Figure 2 , on the basis of Embodiment 1, the negative pressure fan blade 3 is installed on the connecting disc 5, and the arrow direction is the air flow direction.

[0051] Embodiment 3: Such as Figure 5-6 , a grass trimmer head assembly includes Embodiment 1, a connecting disc 5 installed on the second output end 114, and a housing 6 for installing the motor 1. The housing 6 includes a first half shell 61 and a second half shell 62. The first half shell 61 and the second half shell 62 are spliced through a connecting component to form an installation cavity. The connecting component includes a bolt and a nut. The bolt passes through the first half shell 61 and the second half shell 62 and is connected to the nut. Air vents 9 are opened on the first half shell 61 and the second half shell 62. The air vents 9 are in a strip-shaped opening structure.

[0052] The negative pressure fan blade 3 is located between the connecting disk 5 and the motor 1. The negative pressure fan blade 3 can be an independent accessory or can be integrally formed with the connecting disk 5 by injection molding for quick processing.

[0053] Such as Figure 4 When the connecting disk 5 and the negative pressure fan blade 3 are integrally formed, the end face of the connecting disk 5 on the side close to the motor 1 (i.e., the connection surface between the connecting disk 5 and the negative pressure fan blade 3) has a concave structure, and the negative pressure fan blade 3 has a convex structure 53 extending into the concave structure. Specifically, the concave structure includes a first annular groove 51 and a second annular groove 52. The first annular groove 51 and the second annular groove 52 are concentrically arranged, and the diameter of the first annular groove 51 is smaller than that of the second annular groove 52, and the depth of the first annular groove 51 is greater than that of the second annular groove 52.

[0054] Such as Figure 5 A protective frame 7 is provided on the outer ring of the negative pressure fan blade 3 on the housing 6. The protective frame 7 has a hole structure 71 for air to exit, and the negative pressure fan blade 3 is arranged with a gap from the protective frame 7. Since the housing 6 is divided into two halves, the protective frame 7 is also divided into two symmetrical halves and is respectively fixed on the first half shell 61 and the second half shell 62.

[0055] The connecting disk 5 can just be used as an intermediate connecting piece, and the cutter disk can be connected to the connecting disk 5. For example, referring to Figure 4 A first mounting hole 54 and a second mounting hole 55 are provided on the connecting disk 5. The first mounting hole 54 is located at the center of the connecting disk 5, and at least two second mounting holes 55 are provided and are evenly distributed in the circumferential direction around the first mounting hole 54. The cutter disk is stably fixed on the connecting disk 5 through the first mounting hole 54 and the second mounting hole 55. A reinforcing convex structure 56 is provided at the second mounting hole 55, and part of the reinforcing convex structure 56 is located in the first annular groove 51 and the second annular groove 52.

[0056] In another way, the connecting disk 5 itself can be directly used as a cutter disk or directly processed into a cutter disk.

[0057] When the motor 1 works, air is blown in from the air inlet 111 by the axial flow fan blade 2, flows through the inside of the motor 1 and then flows out from the air outlet 112 and is led out by the negative pressure fan blade 3, impacts on the connecting disk 5 and finally is discharged radially along the connecting disk 5.

[0058] Example 4: Such as Figure 7 A lawn mower head assembly, on the basis of Example 3, a gearbox 10 is added. The input shaft of the gearbox 10 is connected to the output shaft of the motor 1 through a coupling. In this way, the first output end 113 and the second output end 114 are arranged in parallel, and at this time the first output end 113 and the second output end 114 are two shaft structures.

[0059] Example 5: Such as Figure 8, the negative pressure fan blades 3 in Embodiments 1-4 are designed as axial flow fan blades. At this time, the connecting disc 5 and the negative pressure fan blades 3 are arranged at intervals. Air is sucked in by the negative pressure fan blades 3 and discharged axially, then impacts the connecting disc 5 and is discharged radially along the connecting disc 5. And the end face of the connecting disc 5 close to the negative pressure fan blades 3 is designed as a conical surface or a frustum surface, so that the air impacts the connecting disc 5 and moves along the conical surface or the frustum surface. Due to the guiding effect of the conical surface or the frustum surface, the air moves axially and radially at the same time, which is more conducive to preventing grass clippings from entering.

[0060] The above description is only some preferred embodiments of the present disclosure and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above utility model concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the embodiments of the present disclosure that have similar functions.

Claims

1. An electric motor assembly for a grass trimmer, comprising: An electric motor, with an air inlet and an air outlet respectively provided at both ends of the outer shell of the electric motor; It is characterized in that: the electric motor has a first output end at the air inlet, the electric motor has a second output end at the air outlet, an axial flow fan blade is installed on the first output end, and a negative pressure fan blade is installed on the second output end; when the electric motor works, air is blown into the electric motor by the axial flow fan blade from the air inlet, flows out from the air outlet after passing through the inside of the electric motor, and is led out by the negative pressure fan blade.

2. A grass trimmer head assembly, characterized in that: It includes the electric motor assembly for a grass trimmer as described in claim 1, a connection disk installed on the second output end, and a housing for installing the electric motor, and the negative pressure fan blade is located between the connection disk and the electric motor.

3. According to the grass trimmer head assembly described in claim 2, it is characterized in that: The negative pressure fan blade is integrally formed with the connection disk.

4. According to the grass trimmer head assembly described in claim 2, it is characterized in that: A protective frame is provided on the outer ring of the housing where the negative pressure fan blade is located, the protective frame has a hole structure for air to exit, and the negative pressure fan blade is arranged with a gap from the protective frame.

5. According to the grass trimmer head assembly described in claim 3, it is characterized in that: The end face of the connection disk close to the electric motor side has an inner concave structure, and the negative pressure fan blade has a convex structure extending into the inner concave structure.

6. According to the grass trimmer head assembly described in claim 5, it is characterized in that: The inner concave structure includes a first annular groove and a second annular groove, the first annular groove and the second annular groove are concentrically arranged and the diameter of the first annular groove is smaller than the diameter of the second annular groove, and the depth of the first annular groove is greater than the depth of the second annular groove.

7. According to the grass trimmer head assembly described in claim 2, it is characterized in that: The housing includes a first half shell and a second half shell, and an installation cavity is formed after the first half shell and the second half shell are spliced through a connection component; the connection component includes a bolt and a nut, and the bolt passes through the first half shell and the second half shell and is connected with the nut.

8. The grass trimmer head assembly according to claim 2, wherein: The output shaft of the electric motor is connected with a gearbox, and the second output end is connected with the output shaft of the gearbox.

9. According to the grass trimmer head assembly described in claim 2, it is characterized in that: The connection disk is provided with a first installation hole and a second installation hole, the first installation hole is located at the center of the connection disk, and at least two second installation holes are provided and are evenly distributed in the circumferential direction around the first installation hole.

10. According to the grass trimmer head assembly described in claim 9, it is characterized in that: A strengthened convex structure is provided at the second installation hole.

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