Garden tool

Abstract

This invention relates to a garden tool, comprising a housing, a working component connected to the housing, a power component driving the working component, a transmission component connecting the working component and the power component, and an oil pump component for lubricating the working component. The working component includes a guide plate extending along a first axis, and the oil pump component includes an oil pump connected to the power component or the transmission component. The garden tool includes a first plane parallel to the guide plate. The projection of the power component in the first plane includes a first center point, the projection of the transmission component in the first plane includes a second center point, and the projection of the oil pump in the first plane includes a third center point. The first and second center points are connected to form a first connecting line, and the second and third center points are connected to form a second connecting line. The included angle between the first and second connecting lines is an obtuse angle. The oil pump, transmission component, and power component are centrally located to ensure the compactness of the overall structure, thereby achieving a miniaturized and lightweight chainsaw.

Description

Technical Field

[0001] This invention relates to a garden tool, and more particularly to a garden tool with a compact structure. Background Technology

[0002] A chainsaw is a common garden tool that includes a housing, a guide plate detachably connected to the housing, a chain wound around the guide plate, a motor housed in the housing, and a battery pack for powering the motor. The motor drives the chain to rotate around the guide plate to perform cutting work.

[0003] As the market develops, users have increasingly higher requirements for the operation experience and performance of garden tools, mainly focusing on the size, weight, and cutting efficiency of the machine. However, the size, weight, and performance of existing garden tools are gradually failing to meet users' high demands.

[0004] Therefore, it is indeed necessary to provide an improved garden tool to overcome the shortcomings of existing technology. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a garden tool with a compact structure.

[0006] The present invention addresses the problems of the prior art by adopting the following technical solution: A garden tool includes a housing, a working component connected to the housing, a power component driving the working component, a transmission component connecting the working component and the power component, and an oil pump component for lubricating the working component. The working component includes a guide plate extending along a first axis, and the oil pump component includes an oil pump connected to the power component or the transmission component. The garden tool includes a first plane parallel to the guide plate. The projection of the power component in the first plane includes a first center point, the projection of the transmission component in the first plane includes a second center point, and the projection of the oil pump in the first plane includes a third center point. The first center point and the second center point are connected to form a first connecting line, and the second center point and the third center point are connected to form a second connecting line. The angle between the first connecting line and the second connecting line is an obtuse angle.

[0007] A further improvement is as follows: the oil pump is connected to the transmission assembly, and the projection of the connection point between the oil pump and the transmission assembly in the first plane and the second center point form a third connecting line. The included angle between the first connecting line and the third connecting line is greater than or equal to 75° and less than or equal to 165°.

[0008] A further improvement is that the angle between the first connecting line and the third connecting line is greater than or equal to 105° and less than or equal to 150°.

[0009] A further improvement is as follows: the transmission assembly includes an output shaft extending along a second axis, the oil pump assembly and the power assembly are located approximately on opposite sides of the output shaft in the direction of the first axis, and the first axis is perpendicular to the second axis.

[0010] A further improvement is that the first connecting line intersects with the projection of the first axis in the first plane, and the included angle formed is greater than or equal to 10° and less than or equal to 30°.

[0011] A further improvement is that the projections of the oil pump and the power assembly in the first plane are approximately located on opposite sides of the first axis.

[0012] A further improvement is that the projections of the oil pump and the power assembly in the first plane are located on the same side of the first axis.

[0013] A further improvement is as follows: the oil pump assembly includes an oil storage tank, a pipe assembly, and the oil pump arranged sequentially along the first axis. The pipe assembly includes an oil inlet pipe and an oil delivery pipe located on opposite sides of the first axis.

[0014] A further improvement is as follows: the power assembly includes a motor with a drive shaft and a first gear connected to the drive shaft; the transmission assembly includes a second gear meshing with the first gear and a third gear drivingly connected to the oil pump; the housing includes a gear cavity accommodating the first gear and the second gear and a gear cover covering the gear cavity in a direction perpendicular to the first plane; the projections of the oil pump, the transmission assembly, and the power assembly in the first plane are approximately located within the projection of the gear cover in the first plane.

[0015] A further improvement is as follows: the projection of the gear cover in the first plane is approximately located in the central region of the projection of the housing in the first plane, and the ratio of the length of the gear cover in the direction of the first axis to the length of the housing in the first axis is greater than or equal to 0.3 and less than or equal to 0.6.

[0016] Compared with the prior art, the present invention has the following beneficial effects: by designing the included angle between the first connecting line formed by connecting the center point of the power component and the center point of the transmission component and the second connecting line formed by connecting the center point of the transmission component and the center point of the oil pump to be an obtuse angle, the oil pump, transmission component and power component are relatively concentrated in the middle area of ​​the main body, ensuring the compactness of the whole machine structure, thereby obtaining a miniaturized and lightweight chainsaw. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the garden tool according to a preferred embodiment of the present invention;

[0018] Figure 2 for Figure 1 A breakdown diagram of the garden tools shown;

[0019] Figure 3 for Figure 1 A cross-sectional view of the garden tools shown;

[0020] Figure 4 for Figure 1 A schematic diagram of the pump assembly, power assembly, and transmission assembly in the garden tool shown;

[0021] Figure 5 for Figure 1 A partial sectional view of the garden tools described;

[0022] Figure 6 for Figure 1 A schematic diagram of the pump assembly, power assembly, and transmission assembly in the garden tool shown;

[0023] Figure 7 This is a partial sectional view of a second embodiment of the garden tool of the present invention;

[0024] Figure 8 This is a partial cross-sectional view of a third embodiment of the garden tool of the present invention.

[0025] Meaning of the reference numerals in the diagram:

[0026] Chainsaw 100, Housing 10

[0027] First casing 101 Second casing 102

[0028] Assembly surface 103, sprocket cover 104

[0029] First accommodating cavity 105 Second accommodating cavity 106

[0030] Gear cavity 107 Air inlet 108

[0031] Air outlet 109 Main body 11

[0032] Main handle 12, Side handle 13

[0033] Mounting section 14, baffle 15

[0034] Fixed bracket 16 Fixed rib position 17

[0035] Gear cover 18 Part 1 181

[0036] Part 2 182 Working Components 20

[0037] Guide plate 21 Power assembly 30

[0038] Motor 31 Drive shaft 311

[0039] First gear 32, fan 33

[0040] Transmission assembly 40 Output shaft 41

[0041] Gear set 42, second gear 421

[0042] Third gear 422 sprocket 423

[0043] Control board 50, oil pump assembly 60

[0044] Oil pump 61 Oil reservoir 62

[0045] Pipe assembly 63, oil inlet pipe 631

[0046] Oil outlet pipe 632 First axis X1

[0047] Second axis X2 Third axis X3

[0048] First connecting wire X4 Second connecting wire X5

[0049] Third connecting line X6, first center point C1

[0050] Second center point C2 Third center point C3 Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0052] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0053] Please refer to Figures 1 to 4 As shown, the present invention relates to a garden tool, specifically a chainsaw 100, including a housing 10, a working component 20 detachably connected to the housing 10, a power component 30 for driving the working component 20, a transmission component 40 connected between the working component 20 and the power component 30, and a battery pack for providing energy to the power component 30.

[0054] The housing 10 includes a first housing 101, a second housing 102 connected to the first housing 101, and an inner cavity formed by the first housing 101 and the second housing 102. The connection between the first housing 101 and the second housing 102 forms a mounting surface 103 that is substantially parallel to the working component 20. The working component 20 includes a guide plate 21 detachably fixed to one side of the first housing 101 and a chain (not shown) wound around the outer periphery of the guide plate 21. The guide plate 21 extends along a first axis X1, and the mounting surface 103 is arranged parallel to the guide plate 21. The housing 10 also includes a sprocket cover 104 detachably connected to one side of the first housing 101. The guide plate 21 is located between the sprocket cover 104 and the first housing 101 and extends forward along the first axis X1 beyond the front end of the housing 10.

[0055] The chainsaw 100 includes a tensioning assembly fixed to a sprocket cover 104, which fixes the guide plate 21 to the outside of the first housing 101 and tensions the chain through the tensioning assembly to prevent the chain from loosening due to working time.

[0056] The housing 10 is formed after the first housing 101 and the second housing 102 are fixed. The housing 10 includes a main body 11 that houses the power assembly 30 and the transmission assembly 40, a main handle 12 located on the upper side of the main body 11, a side handle 13 located on one side of the main body 11, and a mounting part 14 located at the rear end of the main body 11.

[0057] The main body 11 extends in the front-to-back direction, and the main handle 12 is positioned approximately parallel above the main body 11, spaced apart from it to create an operating space for the user to grip. A side handle 13 is connected to the outside of the second housing 102. One end of the side handle 13 is connected to the front of the main handle 12, and the other end is connected to the main body 11, roughly within the extension area of ​​the main handle 12 in the front-to-back direction. This arrangement provides a comfortable operating experience when the user simultaneously grips the main handle 12 and the side handle 13. A battery pack is detachably connected to the mounting section 14. Connecting the battery pack to the rear of the main body 11 and the main handle 12 helps balance the weight of the front guide plate 21 and the chain.

[0058] The chainsaw 100 includes a baffle 15 rotatably disposed in front of the main handle 12 and the side handle 13. The baffle 15 is offset toward the second housing 102 in a lateral direction perpendicular to the front-back direction. This arrangement can effectively separate the operating area (the gripping area of ​​the main handle 12 and the side handle 13) for user operation from the working area of ​​the working component 20 (the cutting area of ​​the guide plate 21 and the chain), thereby providing effective protection for the user.

[0059] The power assembly 30 includes a motor 31 with a drive shaft 311, a first gear 32 fixed to one end of the drive shaft 311, and a fan 33 fixed to the other end of the drive shaft 311. The motor 31 is laterally disposed within the main body 11 and is mostly offset laterally within the second housing 102, that is, the motor 31 is mostly located on the side of the mounting surface 103 closer to the second housing 102. The end of the drive shaft 311 connected to the fan 33 is located close to the second housing 102, and the end of the drive shaft 311 connected to the first gear 32 is generally located on the side of the mounting surface 103 of the first housing 101 and the second housing 102 closer to the first housing 101.

[0060] In this embodiment, the motor 31 is an external rotor motor. The housing 10 includes a fixing bracket 16 fixed to the inner wall of the second housing 102. The fixing bracket 16 surrounds the outer periphery of the external rotor motor 31 to form a first receiving cavity 105 for accommodating the external rotor motor 31. The inner wall of the first housing 101 extends with a fixing rib 17. The fixing rib 17 and the fixing bracket 16 together define a second receiving cavity 106. The first receiving cavity 105 and the second receiving cavity 106 are in fluid communication.

[0061] The chainsaw 100 includes a control board 50 housed within a second receiving cavity 106. A first housing 101 has an air inlet 108 near the circuit board, and the second receiving cavity 106 communicates with the outside through the air inlet 108. A second housing 102 has an air outlet 109 near the fan 33, and the first receiving cavity 105 communicates with the outside through the air outlet 109. When the chainsaw 100 is operating, the airflow generated by the fan 33 enters the second receiving cavity 106 through the air inlet 108, flows over the surface of the control board 50, enters the first receiving cavity 105, passes through the external rotor motor 31, and exits through the air outlet 109, thus forming a complete airflow path to cool the control board 50 and the motor 31.

[0062] The transmission assembly 40 includes an output shaft 41 extending along a second axis X2 and a gear set 42 fixed to the output shaft 41. The output shaft 41 is parallel to the drive shaft 311. The first axis X1 extends in the front-rear direction, the second axis X2 extends in the lateral direction, and the first axis X1 is perpendicular to the second axis X2.

[0063] The gear set 42 includes a second gear 421 meshing with the first gear 32, a third gear 422 spaced laterally from the second gear 421, and a sprocket 423 connected to the chain. The second gear 421 is located approximately in the middle of the output shaft 41 laterally, and the third gear 422 and sprocket 423 are located on opposite sides of the second gear 421. The output shaft 41 passes laterally through the first housing 101, and the sprocket 423 is fixed to the end of the output shaft 41 that passes through the first housing 101, thereby driving the chain to rotate around the guide plate 21.

[0064] The third gear 422 is configured as a worm gear fixed on the output shaft 41. The worm gear is located at the other end of the output shaft 41 away from the sprocket 423. In the transverse direction, the third gear 422 is located on the side of the mounting surface 103 of the first housing 101 and the second housing 102 closer to the second housing 102.

[0065] Combination Figure 5 and Figure 6 As shown, the chainsaw 100 includes an oil pump assembly 60 for lubricating the chain of the working component 20. The oil pump assembly 60 includes an oil pump 61 connected to the power component 30 or the transmission component 40. In this embodiment, the oil pump 61 is connected to the third gear 422 of the transmission component 40. The type of oil pump 61 can be a gear pump, a peristaltic pump, or a plunger pump, etc.

[0066] The oil pump assembly 60 includes an oil reservoir 62 for storing lubricating oil and a pipe assembly 63 connecting the oil reservoir 62 and the oil pump 61. The pipe assembly 63 includes an inlet pipe 631 for transferring lubricating oil from the oil reservoir 62 to the oil pump 61 and an outlet pipe 632 for transferring lubricating oil to the guide plate 21 or the chain. The outlet pipe 632 and the inlet pipe 631 are located on opposite sides of the first axis X1, so that the lengths of the inlet pipe 631 and the outlet pipe 632 are controlled within a reasonable range, reducing the consumption of oil pipe materials and lubricating oil and improving the compactness of the structure.

[0067] The housing 10 includes a gear cavity 107 for accommodating a first gear 32 and a second gear 421, and a gear cover 18 that covers the gear cavity 107 in the direction along the second axis X2. The gear cover 18 is fixed inside the housing 10 and is fixedly connected to the inner wall of the first housing 101 to form the gear cavity 107. The gear cover 18 is connected inside the housing 10 to separate the gear cavity 107 from the rest of the space inside the housing 10.

[0068] In the transverse direction along the second axis X2, the gear cover 18 is approximately located at the mounting surface 103 of the first housing 101 and the second housing 102 and is approximately flush with the mounting surface 103. The gear cover 18 at least partially overlaps with the fixed bracket 16 in the transverse direction. The third gear 422 is located outside the gear cavity 107 to connect with the oil pump 61 of the oil pump assembly 60, thereby driving the oil pump 61 to pump the lubricating oil in the oil reservoir 62 out. The gear cavity 107 is formed by the interconnection between the inner wall of the first housing 101 and the gear cover 18, avoiding the need for an additional gear cavity connected to the gear cover 18, reducing the number of parts, and reducing the weight of the chainsaw 100.

[0069] A first plane parallel to the guide plate 21 is defined. The gear cover 18 includes a first part 181 accommodating the first gear 32 and a second part 182 accommodating the second gear 421. The line connecting the center of the first part 181 and the center of the second part 182 intersects the projection of the first axis X1 onto the first plane, forming an angle greater than or equal to 10° and less than or equal to 30°. That is, the external rotor motor 31 is located on the upper rear side or lower rear side of the output shaft 41. The inclined arrangement of the first part 181 and the second part 182 in the front-rear direction also reduces the size and weight of the gear cover 18 to some extent. Figure 2 As shown, the first part 181 and the second part 182 of the gear cover 18 are roughly arc-shaped, and their shape and outline dimensions are slightly larger than the outer contour gears of the first gear 32 and the second gear 421, thereby reducing the size of the gear cover 18, ensuring the compactness of the structure while further reducing the weight of the whole machine.

[0070] The first part 181 of the gear cover 18 is located between the outer rotor motor 31 and the first gear 32, and the second part 182 of the gear cover 18 is located between the second gear 421 and the oil pump assembly 60. The third gear 422 is located at the end of the gear cover 18 away from the sprocket 423 and on the side of the mounting surface 103 away from the gear cavity 107, such that the projection of the third gear 422 and the outer rotor motor 31 in the plane perpendicular to the first axis X1 at least partially overlaps. The oil pump assembly 60 is arranged in the empty space between the second housing 102 and the gear cover 18, which can make reasonable use of the space inside the housing 10, avoid increasing the width of the housing 10 on the second axis X2, and improve the compactness of the structural layout; in addition, by reasonably arranging the positions of the components inside the housing 10, redundant parts or structures are avoided, thereby avoiding increasing the weight of the chainsaw 100.

[0071] This invention achieves a compact and miniaturized chainsaw 100 through the rational layout of the power assembly 30, transmission assembly 40, and oil pump assembly 60. Furthermore, the motor 31 of this invention is an external rotor motor, which is smaller in size than the internal rotor motor 31 and has higher torque output. The battery pack of this invention is a high-performance battery pack, which can provide high input power to the power assembly 30, enabling the power assembly 30 to achieve an output power of at least 600W. Depending on the application conditions of the chainsaw 100, battery packs with different performance characteristics can be selected to obtain an output power of the power assembly 30 between 600W and 1200W.

[0072] The net weight (i.e., excluding the weight of the battery pack and lubricating oil in the oil tank 62) of the chainsaw 100 of this invention is defined by the housing 10, working component 20, power component 30, and transmission component 40. Since selecting different sizes of bearings, fans 33, or external rotor motors 31 for the fixed gear set 42 will affect the net weight of the chainsaw 100, the chainsaw 100 in this embodiment can be as light as 1350g while maintaining performance. This is quite light for a non-direct-drive, two-handed chainsaw 100, and requires coordination of the layout and selection of various components to achieve this. While meeting performance requirements, the net weight of the chainsaw 100 will vary between 1350g and 2400g depending on the size of the external rotor motor and oil pump used, such as 1400g, 1550g, 1700g, 1800g, 2000g, and 2400g.

[0073] Combining the output power of the aforementioned power component 30 and the net weight variation of the chainsaw 100, the ratio of the output power of the chainsaw 100 to its net weight is greater than or equal to 0.25w / g and less than or equal to 0.58w / g. At this point, the chainsaw 100 has a compact layout, a small appearance, and a lightweight operating experience, and can achieve high-performance output, meeting ergonomic and market demands.

[0074] When using a 6.0Ah battery pack and an external rotor motor 31 with an output power of 600W, the chainsaw 100 can perform at least 100 cutting operations when cutting 100mm*100mm square timber. Its operating time is comparable to that of chainsaws with dual battery packs (also 6.0Ah) currently on the market. When cutting 200mm round timber, the power consumption of the chainsaw 100 with dual battery packs is approximately twice that of the chainsaw 100 of this invention, calculated based on the rated voltage. In other words, the chainsaw 100 of this invention completes the same work with half the power consumption of the chainsaw 100 with dual battery packs. The difference between the chainsaw 100 of this invention and the chainsaw 100 with dual battery packs is that the chainsaw 100 of this invention is much smaller and lighter than the chainsaw 100 with dual battery packs, but its performance is equal to or even exceeds that of the chainsaw 100 with dual battery packs.

[0075] After multiple market surveys, users are currently most concerned about the following aspects of the chainsaw 100: user experience (human-computer interaction, size, weight, etc.) and overall battery life. In this embodiment, the chainsaw 100, through the above-mentioned compact layout and reduction of the number of parts, has a net weight of 1350g and less than or equal to 2400g consisting of the chainsaw housing 10, working component 20, transmission component 40 and power component 30.

[0076] While maintaining a compact overall layout, if the rated output power of the power unit 30 is 600W, using external rotor motors 31 of different sizes (30mm, 38mm, 50mm, 65mm) and corresponding transmission gears will yield net weights of 1350g, 1550g, 1800g, and 2400g respectively. In this case, the ratio of the power unit 30's output power to its net weight will be greater than or equal to 0.25W / g. Depending on the workpiece being cut and the working environment, even with the same battery pack, different output power outputs will occur. For example, the rated output power of the power unit 30 is 600W, but in certain working environments, it may reach a peak power of 800W or even 900W. If a higher-performance battery pack is used, higher output power can be obtained, and the ratio of the power unit 30's output power to its net weight will increase accordingly.

[0077] In this embodiment, the preferred ratio of the output power of the power component 30 to the net weight of the chainsaw 100 is greater than or equal to 0.3w / g and less than or equal to 0.45w / g. This setting allows the user to have a better operating experience while outputting the same power, meaning that the chainsaw 100 has a higher energy density.

[0078] The weight of the chainsaw 100 is mainly concentrated in the working component 20, power component 30, transmission component 40, oil pump component 60, and battery pack. By placing the battery pack on the rear side of the housing 10 to balance the weight of the working component 20, and to ensure that the center of gravity of the whole machine is roughly located below the operating area of ​​the main handle 12, the proper arrangement of the positions of the power component 30, transmission component 40, and oil pump component 60 is extremely important. In addition, in order to obtain a relatively lightweight and compact chainsaw 100, the arrangement and selection of the power component 30, transmission component 40, and oil pump component 60 also play a crucial role.

[0079] Along the front-rear direction of the first axis X1, the oil reservoir 62, pipe assembly 63, oil pump 61, output shaft 41, and drive shaft 311 are arranged in sequence. The oil reservoir 62 is fixed to the front part inside the housing 10, the transmission assembly 40 is laterally arranged on the rear side of the oil reservoir 62 and is located approximately in the middle of the housing 10, the power assembly 30 is arranged on the rear side of the transmission assembly 40 and is spaced a certain distance from the rear end of the housing 10, and the control board 50 is located on the rear side of the power assembly 30 and is arranged close to the mounting part 14.

[0080] Viewed from a direction perpendicular to the first plane, the oil reservoir 62 is placed vertically within the housing 10, with the first axis X1 passing through it front to back. The oil pump 61 is positioned approximately above the first axis X1 and is tilted at a certain angle relative to it. One end of the oil inlet pipe 631 is connected to the bottom of the oil reservoir 62, and the other end is connected to the oil inlet nozzle on the bottom side of the oil pump 61. One end of the oil outlet pipe 632 is connected to the oil outlet nozzle on the upper side of the oil pump 61, and the other end is connected to the guide plate 21, thereby delivering lubricating oil to the chain wound around the guide plate 21. By tilting the oil pump 61, the length of the pipe assembly 63 can be shortened, and the overall dimensions of the machine in the front-back and vertical directions can be reduced, thus reducing the overall weight of the machine.

[0081] The transmission assembly 40 is located approximately in the middle region of the housing 10 in the front-to-back direction. When viewed from a direction perpendicular to the first plane, the output shaft 41 of the transmission assembly 40 is approximately located on the first axis X1 and is approximately aligned with the operating area of ​​the main handle 12 in the vertical direction.

[0082] refer to Figure 5 and Figure 6 As shown, the gear cover 18 covers the gear cavity 107 in a direction perpendicular to the first plane. The projections of the oil pump 61, transmission assembly 40, and power assembly 30 in the first plane are approximately located within the projection of the gear cover 18 in the first plane. This projection is approximately located within the coverage area of ​​the main handle 12 in the longitudinal direction in the vertical direction. In this embodiment, the projections of each component in the first plane are projections of each component onto the first plane from the direction of the second axis X2 perpendicular to the first plane.

[0083] In addition, the projection of the gear cover 18 in the first plane is approximately located in the center area of ​​the projection of the housing 10 in the first plane. The ratio of the length of the gear cover 18 in the direction of the first axis X1 to the length of the housing 10 in the first axis X1 is greater than or equal to 0.3 and less than or equal to 0.6. By concentrating a portion of the transmission assembly 40, the power assembly 30 and the oil pump assembly 60 in the central area of ​​the housing 10, the center of gravity of the heavier components of the chainsaw 100 is brought closer to the central area of ​​the whole machine, thereby balancing the weight of the whole machine and improving the user's operating comfort.

[0084] Viewed from a direction perpendicular to the first plane, the projection of the power assembly 30 in the first plane includes a first center point C1, the projection of the transmission assembly 40 in the first plane includes a second center point C2, and the projection of the oil pump 61 in the first plane includes a third center point C3. The first center point C1 and the second center point C2 are connected to form a first connecting line X4, and the second center point C2 and the third center point C3 are connected to form a second connecting line X5.

[0085] The aforementioned center refers to the relative center of the shadow area formed by projecting the power component 30, transmission component 40, and oil pump 61 onto the first plane. For example, if the power component 30, when projected onto the first plane, forms the outline shadow of the external rotor motor 31, then the center of the power component 30 is the center of the drive shaft 311 of the external rotor motor 31. If the transmission component 40, when projected onto the first plane, forms the outline shadow of the second gear 421, then the center of the transmission component 40 is the outline center of the second gear 421, i.e., the center of the output shaft 41. If the oil pump 61, when projected onto the first plane, forms the outline shadow of the oil pump 61, which is roughly rectangular, then the center of the oil pump 61 is the center of this rectangular shape. Of course, the components are not limited to the structural forms described above; the center point can be defined as the approximate center position of the outline projection of each component onto the first plane.

[0086] Along the front-rear direction of the first axis X1, the oil pump 61 and the power assembly 30 are approximately located on opposite sides of the output shaft 41 of the transmission assembly 40. Viewed from a direction perpendicular to the first plane, the angle between the first connecting line X4 and the second connecting line X5 is an obtuse angle, and the angle between the first connecting line X4 and the second connecting line X5 is greater than or equal to 100° and less than or equal to 180°. To further optimize the compactness of the structural layout, the projection of the connection point between the oil pump 61 and the transmission assembly 40 in the first plane and the second center point C2 form a third connecting line X6, and the angle between the first connecting line X4 and the third connecting line X6 is set to be greater than or equal to 75° and less than or equal to 165°. By controlling the angles between the first connecting line X4 and the second connecting line X5, and between the first connecting line X4 and the third connecting line X6, the compactness of the arrangement of the oil pump 61, the transmission assembly 40, and the power assembly 30 is achieved.

[0087] The following section will explain the impact of the aforementioned angle changes on the layout and function of the chainsaw 100, taking into account the detailed structural arrangement of each component:

[0088] In this embodiment, the projections of the first connecting line X4 and the first axis X1 in the first plane intersect, and the included angle α formed is greater than or equal to 10° and less than or equal to 30°. That is, the center point of the transmission assembly 40 is approximately located on the first axis X1. The power assembly 30 is inclinedly disposed on the rear side of the transmission assembly 40 such that the center point of the power assembly 30 is located within an angle range of 10° to 30° (inclusive) above or below the first axis X1. The inclined arrangement of the power assembly 30 relative to the transmission assembly 40 can shorten the length of the chainsaw 100 on the first axis X1 and its height in the vertical direction, thereby optimizing the overall size of the chainsaw 100.

[0089] When the power assembly 30 is located directly behind the transmission assembly 40, that is, when the output shaft 41 and the drive shaft 311 are approximately on the same straight line, the distance between the output shaft 41 and the drive shaft 311 on the first axis X1 is equal to the distance l1 between the output shaft 41 and the drive shaft 311. At this time, the length of the housing 10 on the first axis X1 is L1. When the projection of the first connecting line X4 and the first axis X1 in the first plane intersects and forms an included angle α, the distance between the output shaft 41 and the drive shaft 311 on the first axis X1 becomes smaller, so that the length L2 of the housing 10 on the first axis X1 decreases accordingly. L1 and L2 satisfy: L1=L2+l1*(1-cosa).

[0090] When the included angle α decreases, the length of the housing 10 on the first axis X1 will increase accordingly, and the height of the housing 10 in the vertical direction perpendicular to the first axis X1 will decrease accordingly. When the included angle α increases, the length of the housing 10 on the first axis X1 will decrease accordingly, but the height of the housing 10 in the vertical direction will increase accordingly. Therefore, in order to obtain a suitable height and length, from the perspective of structural compactness and high performance, after multiple tests, it was found that when the included angle α between the first connecting line X4 and the first axis X1 is greater than or equal to 10° and less than or equal to 30°, the length and height of the housing 10 can achieve a high-performance, low-size chainsaw 100.

[0091] The projections of the oil pump 61 and the power assembly 30 in the first plane are approximately located on opposite sides of the first axis X1, that is, the oil pump 61 is located on the upper side of the first axis X1, and the power assembly 30 is located on the lower side of the first axis X1; or, the oil pump 61 is located on the lower side of the first axis X1, and the power assembly 30 is located on either the upper or lower side of the first axis X1. Alternatively, the projections of the oil pump 61 and the power assembly 30 in the first plane can also be located on the same side of the first axis X1, either both on the upper side of the first axis X1 or both on the lower side of the first axis X1.

[0092] refer to Figures 3 to 8 As shown, the oil pump 61 can be connected to any position on the outer periphery of the third gear 422 away from the outer rotor motor 31. The oil pump 61 is defined to extend along the third axis X3, and the first connecting line X4 forms a 90° angle with the third axis X3. Viewed from the direction of the second axis X2 perpendicular to the first plane (i.e., its projection in the first plane), the third axis X3 forms an angle β with the first axis X1. The following will, in conjunction with specific embodiments, illustrate the influence of the oil pump 61 and the outer rotor motor 31 in different positions on the angle between the first connecting line X4 and the third connecting line X6:

[0093] If the oil pump 61 and the external rotor motor 31 are approximately located on opposite sides of the first axis X1 in the vertical direction (e.g.) Figures 5 to 7If the angle between the first connecting line X4 and the third connecting line X6 is equal to the sum of the angle α between the first connecting line X6 and the first axis X1 and the angle β between the third axis X3 and the first axis X1, plus 90°; the oil pump 61 and the external rotor motor 31 are approximately on the same side of the first axis X1 in the vertical direction (e.g., Figure 8 As shown), the angle between the first connecting line X4 and the third connecting line X6 is equal to the sum of the angle α between the first connecting line X6 and the first axis X1 and 90° minus the angle β between the third axis X3 and the first axis X1.

[0094] If the external rotor motor 31 is located on the lower rear side of the output shaft 41 and the oil pump 61 is horizontally connected to the upper side of the third gear 422, the included angle β is equal to 0°. At this time, the included angle between the first connecting line X4 and the third connecting line X6 is equal to the included angle a between the first connecting line X6 and the first axis X1 plus 90°, that is, greater than or equal to 100° and less than or equal to 120°.

[0095] If the external rotor motor 31 is located on the lower rear side of the output shaft 41, and the oil pump 61 is connected at an angle to the upper front side of the third gear 422 (e.g.) Figure 5 and Figure 6 As shown, when the tilt angle β of the third axis X3 of the oil pump 61 relative to the first axis X1 is 25°, the included angle between the first connecting line X4 and the third connecting line X6 is equal to the included angle a between the first connecting line X6 and the first axis X1 plus the tilt angle β of the oil pump 61 plus 90°, that is, greater than or equal to 125° and less than or equal to 145°.

[0096] If the external rotor motor 31 is located on the upper rear side of the output shaft 41 and the oil pump 61 is horizontally connected to the lower front side of the third gear 422 (e.g.) Figure 7 As shown, when the tilt angle β of the third axis X3 of the oil pump 61 relative to the first axis X1 is 35°, the included angle between the first connecting line X4 and the third connecting line X6 is equal to the included angle a between the first connecting line X6 and the first axis X1 plus the tilt angle β of the oil pump 61 plus 90°, that is, greater than or equal to 135° and less than or equal to 155°.

[0097] If the external rotor motor 31 is located at the lower rear side of the output shaft 41 and the oil pump 61 is horizontally connected to the lower front side of the third gear 422 (e.g.) Figure 8 As shown, when the tilt angle β of the third axis X3 of the oil pump 61 relative to the first axis X1 is 35°, the angle between the first connecting line X4 and the third connecting line X6 is equal to the tilt angle β of the oil pump 61 plus 90° minus the angle a between the first connecting line X6 and the first axis X1, that is, greater than or equal to 95° and less than or equal to 115°.

[0098] The oil pump 61 can be located above or below the first axis X1. In order to improve the compactness of the structural layout, it is preferable to set the included angle β (i.e. the tilt angle of the oil pump 61) between the third axis X3 extending from the oil pump 61 and the first axis X1 to be greater than or equal to 15° and less than or equal to 45°.

[0099] The inclined arrangement of the oil pump 61 relative to the first axis X1 optimizes the layout of the pipe assembly 63. If the inclination angle β of the oil pump 61 decreases, its length on the first axis X1 will increase accordingly. After the distance between the oil reservoir 62 and the transmission assembly 40 is limited, if the length of the oil pump 61 on the first axis X1 changes, the fixed paths of the oil inlet pipe 631 and the oil outlet pipe 632 in the direction of the first axis X1 will be correspondingly restricted, and the oil pipes cannot extend smoothly and evenly, affecting the efficiency of oil inlet and outlet. Therefore, considering both the compactness of the layout and the lubrication efficiency, the included angle between the first connecting line X4 and the third connecting line X6 is set to be greater than or equal to 75° and less than or equal to 165°, preferably greater than or equal to 105° and less than or equal to 150°.

[0100] The connection points of the oil pump 61 and the transmission component 40, the center point of the transmission component 40, and the center point of the power component 30 are connected by two lines in the first plane to form an obtuse triangle. The length of the housing 10 of the chainsaw 100 in the front-to-back direction and the height in the vertical direction are kept within a relatively balanced range, so that the internal components of the housing 10 can be arranged in a compact manner in terms of length and height without leaving too much empty space.

[0101] In the transverse direction along the second axis, the power assembly 30 is biased toward the second housing 102, and the transmission assembly 40 is biased toward the first housing 101; the gear cover 18 is located approximately on the mounting surface 103 of the first housing 101 and the second housing 102, and the second gear 421 is approximately fixed in the transverse direction at the center of the output shaft 41, such that the overlap distance between the drive shaft 311 and the output shaft 41 in the transverse direction is approximately half the transverse length of the output shaft 41. This arrangement can balance the weight of the transmission assembly 40 and the power assembly 30 in the transverse direction.

[0102] The oil pump 61 and the third gear 422 are located inside the second housing 102, between the outer rotor motor 31 and the oil tank 62 in the front-rear direction. The oil pump 61 and the sprocket 423 are located on opposite sides of the mounting surface 103, which avoids the sprocket 423 and the oil pump 61 being located at the same end of the output shaft 41, thereby increasing the width of the chainsaw 100 in the lateral direction and reducing the compactness of the layout in the width direction.

[0103] The control board 50 is positioned close to the first housing 101 and passes laterally through the mounting surface 103, coinciding laterally with the drive shaft 311. Compared to a configuration where the control board 50 is placed horizontally or obliquely above or beside the outer rotor motor 31 or the transmission assembly 40, resulting in a cluttered arrangement of the chamber accommodating the control board 50 and the outer rotor motor 31, leading to poor heat dissipation, the control board 50 is positioned between the power assembly 30 and the mounting portion 14. The second accommodating cavity 106 accommodating the control board 50 is relatively independent from the first accommodating cavity 105 accommodating the outer rotor motor 31, but they are connected at the ends. This allows the cooling airflow to fully pass through the control board 50 and the outer rotor motor 31 for adequate heat dissipation, thereby ensuring that the chainsaw 100 maintains high-performance output.

[0104] In addition, the lubricating oil in the oil reservoir 62 is transported to the guide plate 21 through the pipe assembly 63. In order to reduce the length of the pipe assembly 63, the oil reservoir 62 is set at the front of the housing 10. The oil pump 61 is set between the oil reservoir 62 and the output shaft 41, which further shortens the length of the oil inlet pipe 631 and the oil outlet pipe 632, and avoids the oil inlet pipe 631 and the oil outlet pipe 632 from being too long and extending inside the housing 10. This not only avoids the increase in weight caused by the excessive length of the pipe assembly 63, but also avoids the excessive length of the pipe assembly 63 from affecting the compactness of the overall layout.

[0105] This invention achieves a miniaturized and lightweight chainsaw 100 by tilting the oil pump 61 to the front of the transmission assembly 40 and positioning the power assembly 30 to the upper rear or lower rear of the transmission assembly 40, while controlling the tilt angle of the oil pump 61 and the positional offset of the power assembly 30 within a certain range. This ensures that the oil pump 61, transmission assembly 40, and power assembly 30 are relatively concentrated in the middle area of ​​the main body 11, thus maintaining the compactness of the overall structure. In addition, by connecting the gear cover 18 to the first housing 101 to form a gear cavity 107, setting the external rotor motor 31, and tilting the oil pump 61 to shorten the length of the pipe assembly 63, the weight of the entire machine is reduced, improving the user experience while achieving high-performance output.

[0106] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions to the garden tools of this invention exist without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. A garden tool comprising a housing, a working assembly connected to the housing, a power assembly driving the working assembly, a transmission assembly connected between the working assembly and the power assembly, and a pump oil assembly for lubricating the working assembly, the working assembly comprising a guide plate extending along a first axis, the pump oil assembly comprising an oil pump connected to the power assembly or the transmission assembly; characterized in that: The garden tool includes a first plane parallel to the guide plate. The projection of the power component in the first plane includes a first center point. The projection of the transmission component in the first plane includes a second center point. The projection of the oil pump in the first plane includes a third center point. The first center point and the second center point are connected to form a first connecting line. The second center point and the third center point are connected to form a second connecting line. The angle between the first connecting line and the second connecting line is an obtuse angle. The transmission component includes a gear set. The housing includes a gear cavity that accommodates the gear set and a gear cover that covers the gear cavity in a direction perpendicular to the first plane. The projections of the oil pump, the transmission component, and the power component in the first plane are approximately located within the projection of the gear cover in the first plane.

2. The garden tool of claim 1, wherein: The oil pump is connected to the transmission assembly. The projection of the connection point between the oil pump and the transmission assembly in the first plane and the second center point form a third connecting line. The included angle between the first connecting line and the third connecting line is greater than or equal to 75° and less than or equal to 165°.

3. A garden tool according to claim 2, characterised in that: The angle between the first connecting line and the third connecting line is greater than or equal to 105° and less than or equal to 150°.

4. The garden tool of claim 1, wherein: The transmission assembly includes an output shaft extending along a second axis, and the oil pump assembly and the power assembly are located approximately on opposite sides of the output shaft in the direction of the first axis, which is perpendicular to the second axis.

5. The garden tool according to claim 4, characterized in that: The first connecting line intersects the projection of the first axis in the first plane and the included angle formed is greater than or equal to 10° and less than or equal to 30°.

6. The garden tool according to claim 5, characterized in that: The projections of the oil pump and the power assembly in the first plane are approximately located on opposite sides of the first axis.

7. The garden tool according to claim 5, characterized in that: The projections of the oil pump and the power assembly in the first plane are located on the same side of the first axis.

8. The garden tool according to claim 6 or 7, characterized in that: The oil pump assembly includes an oil storage tank, a pipe assembly, and the oil pump arranged sequentially along the first axis. The pipe assembly includes an oil inlet pipe and an oil delivery pipe located on opposite sides of the first axis.

9. The garden tool according to claim 1, characterized in that: The power assembly includes a motor with a drive shaft and a first gear connected to the drive shaft. The transmission assembly includes a second gear meshing with the first gear and a third gear drivingly connected to the oil pump. The housing includes a gear cavity accommodating the first gear and the second gear. The gear cover includes a first portion accommodating the first gear and a second portion accommodating the second gear. The line connecting the centers of the first portion and the second portion intersects the projection of the first axis in the first plane.

10. The garden tool according to claim 9, characterized in that: The projection of the gear cover in the first plane is approximately located in the central region of the projection of the housing in the first plane, and the ratio of the length of the gear cover in the direction of the first axis to the length of the housing in the first axis is greater than or equal to 0.3 and less than or equal to 0.6.

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