Power assembly and gardening tool

Abstract

The present invention provides a power assembly and a gardening tool. The power assembly includes a housing, a motor, a working assembly and a transmission assembly. The transmission assembly includes a transmission disc drivingly connected to the motor, a stop portion fixedly connected to the output shaft of the working assembly, a rolling member, and a stop ring for receiving the stop portion and the rolling member. An annular track is formed between the stop portion and the stop ring, and the transmission disc and the rolling member are located within the annular track. The transmission assembly has a locked state and an unlocked state. When the transmission assembly is in the locked state, the working assembly cannot rotate in the reverse direction. When the transmission assembly is in the unlocked state, the working assembly is driven by the transmission assembly to rotate forward. Compared with the prior art, the present invention can prevent the cutter of the lawn mower from being damaged by the rebounding force of a violent collision when it collides with a hard object, thus playing a protective role.

Description

Technical Field

[0001] The invention relates to a power component and a garden tool using the power component. Background Art

[0002] A push mower is a common mowing equipment with high efficiency and simple and convenient operation. It is suitable for mowing lawns such as sanitation grasslands and green shade lands. During the use of a push mower, the blade may accidentally collide with hard objects such as stones or iron pipes. The blade violently collides with such hard objects, and the strong collision rebound force often damages the structure of the blade output shaft, causing the machine to be unable to continue to be used.

[0003] In view of this, it is necessary to propose a power assembly and a garden tool to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a power assembly and a garden tool, which are used to protect the output shaft structure and are easy to maintain.

[0005] To achieve the above-mentioned purpose, the present invention provides a power assembly, including: a housing; a motor for driving the power assembly; a working assembly, including an output shaft for outputting the power of the motor; a transmission assembly, including a transmission disk connected to the motor, a stopper fixedly connected to the output shaft, a rolling element, and a stop ring for accommodating the stopper and the rolling element, an annular track is formed between the stopper and the stop ring, and the transmission disk and the rolling element are located in the annular track; the transmission assembly has a locked state and an unlocked state, when the transmission assembly is in the locked state, the working assembly cannot rotate in the reverse direction; when the transmission assembly is in the unlocked state, the working assembly is driven by the transmission assembly to rotate forward.

[0006] As a further improvement of the present invention, when the transmission assembly is in an unlocked state, power is transmitted from the transmission disc, the rolling element, and the stopper to the working assembly in sequence.

[0007] As a further improvement of the present invention, when the transmission assembly is in a locked state, the reverse force is transmitted from the working assembly to the stopper, the rolling element and the stop ring in sequence.

[0008] As a further improvement of the present invention, when the transmission assembly is in a locked state, the motor stops rotating.

[0009] As a further improvement of the present invention, a limiting portion is formed on the outer surface of the stop portion, the rolling element is in contact with the limiting portion, and the limiting portion is a section parallel to the extension direction of the output shaft.

[0010] As a further improvement of the present invention, the diameter of the rolling member is greater than the difference between the outer diameter of the stopping portion and the inner diameter of the stopping ring, so as to limit the rotation of the rolling member within the range of the cutting plane.

[0011] As a further improvement of the present invention, a dial is provided on the transmission disc. The dial is received between two adjacent rolling members. The dial is arc-shaped and the arc surface of the dial fits with the outer arc surface of the stopping portion and the inner arc surface of the stopping ring.

[0012] As a further improvement of the present invention, there are three groups corresponding to the cutting plane, the dial and the rolling member respectively, and two adjacent cutting planes are arranged at an interval of 120° on the stopping portion, and two adjacent dials are also arranged at an interval of 120° on the transmission disc.

[0013] As a further improvement of the present invention, the position where the rolling member is located at the center of the limiting portion is defined as the initial position. At the initial position, the distances between the dial and the rolling members on the adjacent two sides are the same. The maximum angle that the rolling member can rotate around the output shaft is X°. The rotation angle of the dial from the initial position to the contact with the rolling member is Y°, and Y°≥X°.

[0014] As a further improvement of the present invention, the stopping portion is sleeved on the output shaft, and the output shaft is formed with a matching structure that matches the inner ring of the stopping portion, so that the stopping portion can rotate synchronously with the output shaft.

[0015] As a further improvement of the present invention, the transmission assembly further includes a transmission gear fixedly connected to the transmission disc. A first bearing is provided between the transmission gear and the transmission disc. A second bearing is provided at the lower end of the stopping ring. A third bearing is provided at the lower end of the housing. The first bearing, the second bearing and the third bearing are all sleeved on the output shaft.

[0016] As a further improvement of the present invention, there are two groups of the working assembly and the transmission assembly respectively, and they are driven by the same motor.

[0017] To achieve the above object, the present invention further provides a gardening tool, including a main body, a traveling assembly and the power assembly as described above.

[0018] The beneficial effect of the present invention is that when the cutter of the lawn mower collides with a hard object, the output shaft structure can be prevented from being damaged due to the rebounding force of the violent collision, which plays a protective role. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the gardening tool of the present invention when it is a lawn mower.

[0020] Figure 2 isFigure 1 Schematic cross-sectional view of the cutter assembly of the shown lawn mower

[0021] Figure 3 is Figure 2 Partial cross-sectional view at the cutter assembly in

[0022] Figure 4 is Figure 3 Internal exploded view of the cutter assembly in after removing the housing

[0023] Figure 5 is Figure 4 Schematic view from another angle of

[0024] Figure 6 is Figure 5 Exploded structural view of the transmission assembly and the working assembly in

[0025] Figure 7 is Figure 6 Schematic view after combining some structures in

[0026] Figure 8 is Figure 7 Exploded view of the stop part in

[0027] Figure 9 Cross-sectional structural view of the transmission assembly at the stop ring

[0028] Figure 10 is Figure 9 Schematic view of the rotation angle of the rolling element in

[0029] Figure 11 Schematic view when the paddle drives the rolling element to drive the output shaft to work

[0030] Figure 12 Schematic view when the rolling element is braked under the action of a reverse force on the output shaft Detailed implementation manner

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Here, it should be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0033] In addition, it should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0034] The present invention discloses a garden tool having a power assembly. The garden tool may be a lawn mower 100, and the power assembly may also be a cutter assembly 200. Of course, the power assembly may also be applied to other garden tools. For example, when the garden tool is a snow blower, the power assembly is a snow blowing assembly, which will not be described in detail herein and is not subject to any limitation. For the sake of clarity, in the following description, the cutter assembly 200 applied to the lawn mower 100 will be taken as an example to describe the specific structure of the cutter assembly 200 in detail.

[0035] As Figure 1 and Figure 2 shown, the present invention discloses a lawn mower 100, which includes a main body 101, a traveling assembly 102 and a cutter assembly 200. The traveling assembly 102 includes traveling wheels disposed on the front and rear sides of the main body 101, and the cutter assembly 200 is disposed below the main body 101.

[0036] As Figure 3 shown, in a preferred embodiment of the present invention, the cutter assembly 200 includes a housing 10, a motor 20, a working assembly 30 and a transmission assembly 40. The housing 10 is used to accommodate the working assembly 30 and the transmission assembly 40. Specifically, the housing 10 includes a vertical portion 11 for accommodating the working assembly 30 and a horizontal portion 12 for accommodating the transmission assembly 40.

[0037] The motor 20 is disposed outside the housing 10 and is used to drive the cutter assembly 200. In this embodiment, the motor 20 is disposed above the housing 10, the motor shaft of the motor 20 is vertically disposed and extends into the housing 10 and is connected to the transmission assembly 40.

[0038] The working component 30 includes an output shaft 31 for outputting the power of the motor 20, and a cutter 32 provided at one end of the output shaft 31. The output shaft 31 is arranged vertically in the vertical portion 11, and the cutter 32 is provided outside the housing 10 and at the other end of the housing 10 relative to the position of the motor 20, that is, the cutter 32 is horizontally arranged below the vertical portion 11. In the present invention, a first bearing 45, a second bearing 46 and a third bearing 33 are sequentially arranged on the output shaft 31. Among them, the third bearing 33 is fixedly connected to the lower end of the vertical portion 11, and the output shaft 31 passes through the third bearing 33 and is fixedly connected to the cutter 32.

[0039] As Figure 4 and Figure 5 shown, the transmission component 40 includes a transmission gear 41, a transmission disc 42, a stop portion 43 and a stop ring 44. The stop ring 44 is preferably made of a metal material. The transmission gear 41, the transmission disc 42, the stop portion 43 and the stop ring 44 are sequentially sleeved on the output shaft 31. Specifically, a first bearing 45 is provided between the transmission gear 41 and the transmission disc 42. The first bearing 45 is sleeved on the output shaft 31. A screw hole is provided at the top of the output shaft 31 on one side of the first bearing 45 to fix the output shaft 31 to the inner ring of the first bearing 45 through a bolt and limit and fix the output shaft 31 in the vertical direction. Among them, the transmission disc 42 is fixedly connected to the transmission gear 41 and rotates synchronously. An installation hole corresponding to the transmission gear 41 is provided at the circumferential edge of the transmission disc 42, and the transmission disc 42 and the transmission gear 41 can be fixedly connected through a bolt.

[0040] Specifically, there may be one transmission gear 41. The transmission gear 41 can be directly sleeved on the motor shaft of the motor 20, and the transmission disc 42 can be directly driven to rotate by the motor 20. Of course, multiple transmission gears 41 can also be provided, and power connection can be provided between adjacent transmission gears 41. The motor shaft of the motor 20 and the transmission disc 42 are respectively connected to different transmission gears 41, and through the mutual cooperation of multiple transmission gears 41, the motor 20 drives the transmission disc 42 to rotate. In the embodiment of the present invention, three transmission gears 41 are provided. Among them, the size and dimensions of the transmission gears 41 can be set according to specific needs, and the transmission ratio can be changed by configuring transmission gears 41 with different dimensions, which is not limited herein.

[0041] The stop portion 43 is sleeved on the output shaft 31. Specifically, the stop portion 43 has a cylindrical structure and an irregular inner ring, which can be a polygonal structure. The output shaft 31 is formed with a mating structure that mates with the inner ring of the stop portion 43. This mating structure can be multiple planes, so that the stop portion 43 can rotate synchronously with the output shaft 31.

[0042] As Figure 6 shown, further, an outer stop ring 44 for receiving the stop portion 43 is provided on the outer ring of the stop portion 43. A cylindrical cavity 441 for the stop portion 43 to rotate is provided inside the stop ring 44. The stop ring 44 is fixed on the housing 10. A second bearing 46 is provided at the lower end of the stop ring 44, that is, the output shaft 31 passes through the stop portion 43, the stop ring 44, and the second bearing 46 in sequence.

[0043] An annular track 442 is formed between the inner side of the stop ring 44 and the stop portion 43. The annular track 442 is located inside the cylindrical cavity 441. A plurality of limiting portions 431 are formed on the outer surface of the stop portion 43. The rolling member 432 contacts the limiting portion 431. A dial 421 is provided on the transmission disc 42. The dial 421 is received between two adjacent rolling members 432. When the transmission disc 42 rotates, the dial 421 abuts against the rolling member 432 to transmit the power of the motor 20 to the output shaft 31.

[0044] As Figure 7 and Figure 8 shown, preferably, an annular groove 433 is provided on the outer wall surface of the stop portion 43 along a circle in the radial direction. A rubber ring 434 is provided in the annular groove 433. The rubber ring 434 is used to abut the rolling member 432 against the inner wall of the stop ring 44 to increase the friction between the rolling member 432 and the inner wall of the stop ring 44 and the outer wall of the stop portion 43.

[0045] Further, the dial 421 is arc-shaped. The dial 421 fits the arc surface on the outside of the stop portion 43 and the arc surface on the inside of the stop ring 44, so that the dial 421 can rotate in the annular track 442. Further still, the dial 421 is further provided with a chamfer structure 422 to make the rotation of the dial 421 smoother and prevent friction with the inner side of the stop ring 44 and the stop portion 43.

[0046] In another embodiment of the present invention, the limiting portion 431 is a section plane parallel to the extending direction of the output shaft 31. In this embodiment, the diameter of the rolling member 432 is greater than the difference between the outer diameter of the stopping portion 43 and the inner diameter of the stopping ring 44 to limit the rotation of the rolling member 432 within the range of the section plane 431. There are three groups corresponding to the section plane 431, the paddle 421, and the rolling member 432 respectively, and two adjacent section planes 431 are arranged at an interval of 120° on the stopping portion 43, two adjacent paddles 421 are also arranged at an interval of 120° on the transmission disc 42, and two adjacent rolling members 432 are also arranged at an interval of 120°. Of course, the specific number and angular relationship of the section plane 431, the paddle 421, and the rolling member 432 can be set as required and are not limited herein.

[0047] As Figure 9 and Figure 10 shown, in a specific embodiment of the present invention, the position where the rolling member 432 is located at the center of the section plane 431 is defined as the initial position. At this time, the distances from any paddle 421 to the rolling members 432 on both adjacent sides are the same. Within the limiting range of the section plane 431, the maximum angle by which the rolling member 432 can rotate around the output shaft 31 is X°, and the rotation angle of the paddle 421 from the initial position to the position where it abuts against the rolling member 432 is Y°, where Y°≥X°, preferably Y°≥2X°. Such a setting can increase the safety distance so that the transmission assembly 40 will not be damaged when encountering resistance.

[0048] Preferably, a gasket 47 is provided between the stopping portion 43 and the stopping ring 44 along the extending direction of the output shaft 31 to prevent the stopping portion 43 from scratching the stopping ring 44 during rotation. Of course, a gasket 47 can also be provided between the second bearing 46 and the stopping ring 44.

[0049] As Figures 2 to 5 shown, in other embodiments of the present invention, there are two groups of the working assembly 30 and the transmission assembly 40 respectively, and they are driven by the same motor 20. In this embodiment, the number of transmission gears 41 of the two groups of transmission assemblies 40 can be different. Specifically, the two groups of transmission assemblies 40 can be arranged along the same straight line direction, or can be other structures, which are not limited herein. Since the other structures of the working assembly 30 and the transmission assembly 40 are the same, they are not limited herein.

[0050] The working process of the cutter assembly 200 of the present invention will be described in detail below.

[0051] The transmission assembly 40 has an unlocked state and a locked state. When the transmission assembly 40 is in the unlocked state, the working assembly 30 is driven to rotate forward by the transmission assembly 40. At this time, power is sequentially transmitted from the transmission disk 42, the rolling member 432, and the stopping portion 43 to the working assembly 30. When the transmission assembly 40 is in the locked state, the working assembly 30 cannot rotate in the reverse direction. At this time, even if the working assembly 30 accidentally collides with a hard object and the motor 20 stops rotating, the reverse force is sequentially transmitted from the working assembly 30 to the stopping portion 43, the rolling member 432, and the stopping ring 44, and will not directly act on the motor 20, and the working assembly 30 cannot rotate in the reverse direction.

[0052] As Figure 11 shown, after the lawn mower 100 is normally started, the motor 20 drives the transmission gear 41 to rotate, and then drives the paddle 421 to drive the rolling member 432 to rotate around the annular track 442. When the rolling member 432 rotates to the maximum limit position, the rolling member 432 abuts between the inner wall of the stopping ring 44 and the outer wall of the stopping portion 43. Since the stopping ring 44 is fixed, the stopping portion 43 is driven, thereby driving the cutter 32 to rotate. At this time, the transmission assembly 40 is in the unlocked state.

[0053] During the actual use process, when testing the lawn mower 100, it is found that: the force received when the transmission assembly 40 is damaged is more than ten times the driving force received when the transmission assembly 40 is working normally. During the process of the lawn mower 100 moving forward to mow the grass, when the cutter 32 accidentally collides with a hard object, the cutter 32 together with the output shaft 31 will immediately stop rotating or even rebound. At this time, the current of the motor 20 will increase rapidly due to the stall. After the control board detects the rapid increase in current, it determines that a stall has occurred and automatically shuts down. However, the rebound of the cutter 32 will drive the output shaft 31, the transmission assembly 40, and the motor 20 to rotate in the reverse direction, and this reverse rotation will cause great damage to the motor 20 and the transmission assembly 40.

[0054] As Figure 12As shown, in the present application, when the cutter 32 drives the output shaft 31 to rotate in the reverse direction, the output shaft 31 drives the stopper portion 43 to rotate in the reverse direction, and the stopper portion 43 drives the rolling member 432 and the paddle 421 in contact therewith to rotate in the reverse direction. Since the rolling member 432 is abutted between the inner wall of the retaining ring 44 and the outer wall of the stopper portion 43, the rolling member 432 cannot move. Therefore, the reverse force received by the rolling member 432 cannot be transmitted to the paddle 421. Further, even if the rolling member 432 rotates, since the free movement angle Y of the paddle 421 is greater than the free movement angle X of the rolling member 432, the reverse force of the rolling member 432 cannot be transmitted to the paddle 421. The reverse force of the stopper portion 43 will be transmitted to the retaining ring 44 through the rolling member 432, and the paddle 421 rotates in the reverse direction by a small distance to achieve non-contact with the rolling member 432, avoiding the transmission of the reverse force to the transmission assembly 40 and the motor 20 through it. At this time, the transmission assembly 40 is in a locked state.

[0055] In other embodiments of the present invention, the lawn mower 100 is provided with a handle 103 for the user to hold. The handle 103 is provided with a self-propelled control switch for driving the traveling assembly 102 and a cutter control switch for controlling the cutter 32, which is convenient for operation. The lawn mower 100 is further provided with a battery pack assembly (not shown) for supplying power to the lawn mower 100.

[0056] In summary, the present invention can prevent the cutter 32 of the lawn mower 100 from being damaged by the rebounding force of a violent collision when it collides with a hard object, playing a protective role.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A power assembly, characterized in that, comprising: a housing; a motor for driving the power assembly; a working assembly including an output shaft for outputting the power of the motor; a transmission assembly including a transmission disc drivingly connected to the motor, a stop portion fixedly connected to the output shaft, rolling elements, and a stop ring accommodating the stop portion and the rolling elements, the stop ring being fixed to the housing, an annular track being formed between the stop portion and the stop ring, and the transmission disc and the rolling elements being located within the annular track; the transmission assembly has a locked state and an unlocked state. When the transmission assembly is in the locked state, a reverse force is sequentially transmitted from the working assembly to the stop portion, the rolling elements, and the stop ring, and the working assembly cannot rotate in the reverse direction; when the transmission assembly is in the unlocked state, power is sequentially transmitted from the transmission disc, the rolling elements, and the stop portion to the working assembly, and the working assembly is driven by the transmission assembly to rotate forward. A limiting portion is formed on the outer surface of the stop portion, and a dial is provided on the transmission disc. The dial is accommodated between two adjacent rolling elements. The position where the rolling element is located at the center of the limiting portion is defined as the initial position. At the initial position, the distances between the dial and the adjacent rolling elements on both sides are the same. The maximum angle by which the rolling element can rotate around the output shaft is X°, and the rotation angle of the dial from the initial position to the position where it abuts against the rolling element is Y°, and Y°≥X°.

2. The power assembly according to claim 1, characterized in that: when the transmission assembly is in the locked state, the motor stops rotating.

3. The power assembly according to claim 1, characterized in that: the rolling element contacts the limiting portion, and the limiting portion is a tangent plane parallel to the extending direction of the output shaft.

4. The power assembly according to claim 3, characterized in that: the diameter of the rolling element is greater than the difference between the outer diameter of the stop portion and the inner diameter of the stop ring to limit the rotation of the rolling element within the range of the tangent plane.

5. The power assembly according to claim 3, characterized in that: the dial is arc-shaped and the dial fits the arc surface on the outside of the stop portion and the arc surface on the inside of the stop ring.

6. The power assembly according to claim 5, characterized in that: there are three groups of the tangent plane, the dial, and the rolling element respectively, and two adjacent tangent planes are arranged at an interval of 120° on the stop portion, and two adjacent dials are also arranged at an interval of 120° on the transmission disc.

7. The power assembly according to claim 1, characterized in that: the stop portion is sleeved on the output shaft, and the output shaft is formed with a mating structure that mates with the inner ring of the stop portion so that the stop portion can rotate synchronously with the output shaft.

8. The power assembly according to claim 1, characterized in that: the transmission assembly further includes a transmission gear fixedly connected to the transmission disc. A first bearing is provided between the transmission gear and the transmission disc. A second bearing is provided at the lower end of the stop ring. A third bearing is provided at the lower end of the housing. The first bearing, the second bearing, and the third bearing are all sleeved on the output shaft.

9. The power assembly according to claim 1, wherein: both the working assembly and the transmission assembly are provided with two groups, and are driven by the same motor.

10. A garden tool, wherein: it includes a main body, a traveling assembly, and the power assembly according to any one of claims 1-9.

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