Power tool

Abstract

A power tool (100). The power tool (100) comprises a rack (110), a battery pack assembly (130), a driving motor (141) and a working assembly (150). The battery pack assembly (130) is mounted on the rack (110) and supplies energy for the power tool (100); the driving motor (141) is mounted on the rack (110); the working assembly (150) is mounted on the rack (110), and is driven by the driving motor (141) to rotate; the battery pack assembly (130) and the driving motor (141) are located above the rotating shaft (151) of the working assembly (150), and are arranged in the extension direction of the rotating shaft (151). The problem of up and down bounce generated by the working assembly (150) during working can be effectively mitigated, and the operation effect and the operation efficiency of the working assembly (150) are improved; moreover, the vibration hand feeling of an operator can also be mitigated, and the operation comfort of the user is improved.

Description

A power tool Technical Field

[0001] The utility model relates to the field of garden tools, in particular to a power tool. Background Art

[0002] Currently available power tools, such as scarifiers, lawn rakes, and sweepers, generally have the problem of unreasonable layout of the drive device and battery pack assembly. Not only does this make the overall structure of the power tool non-compact, affecting the appearance of the equipment, but the gravity generated by the battery pack assembly and the drive device cannot effectively suppress the up and down bouncing problem caused by the working component during operation, resulting in poor operating results of the working component, low operating efficiency, and large vibrations and poor comfort for users.

[0003] Utility Model Content

[0004] In view of the above shortcomings of the prior art, the present invention provides a power tool to improve the technical problems of the prior art power tools, such as poor operating effects and low operating efficiency caused by unreasonable layout of the driving device and battery pack assembly.

[0005] To achieve the above and other related objectives, the present invention provides a power tool comprising: a frame, a battery pack assembly, a drive motor, and a working assembly. The battery pack assembly is mounted on the frame to supply energy to the power tool; the drive motor is mounted on the frame; and the working assembly is mounted on the frame and rotated by the drive motor. The battery pack assembly and the drive motor are located above the rotating axis of the working assembly and arranged along the extension direction of the rotating axis of the working assembly.

[0006] In an example of the power tool of the present invention, the drive motor is arranged in the middle position of the extension direction of the rotating shaft of the working component, and the battery pack assembly includes multiple battery pack units, which are respectively located on both sides of the drive motor.

[0007] In an example of the power tool of the present invention, a plurality of battery pack units are symmetrically arranged on both sides of the drive motor.

[0008] In an example of the power tool of the present invention, a first shell is provided on a side of the frame away from the working assembly, and the drive motor and the battery pack assembly are installed in the first shell.

[0009] In one example of the power tool of the present invention, a travel wheel assembly and a push rod are also installed on the frame. Along the travel direction of the power tool, the rotating axis of the working assembly is set between the center of gravity of the first shell and the rotating axis of the travel wheel assembly, and the push rod is set on the side close to the travel wheel.

[0010] In an example of the power tool of the present invention, a battery pack installation cavity is provided in the first shell, and the battery pack unit is accommodated in the battery pack installation cavity.

[0011] In an example of the power tool of the present invention, the power tool further includes a transmission assembly, the drive motor is disposed in the first housing, and the drive motor is transmission-connected to the working assembly via the transmission assembly.

[0012] In one example of the power tool of the present invention, the first shell has a first air inlet and a first air outlet; a second shell is provided inside the first shell, the drive motor is provided inside the second shell, the second shell has a second air inlet and a second air outlet, the second air inlet is connected to the first air inlet, and the second air outlet is connected to the first air outlet.

[0013] In an example of the power tool of the present invention, a control board is further provided in the first shell. The control board is provided between the multiple battery pack units and is located above the drive motor.

[0014] In an example of the power tool of the present invention, a control board is further provided in the first housing. The control board includes a heat sink, and the heat sink is provided between the first air inlet and the second air inlet.

[0015] In an example of the power tool of the present invention, a control panel is also provided in the first shell, which includes a heat sink, and an air flow duct is formed between the heat sink and the side wall of the first shell, and the two ends of the air flow duct are respectively connected to the first air inlet and the second air inlet.

[0016] In the power tool of the present utility model, the battery pack assembly and the drive motor are located above the rotating shaft of the working assembly and are arranged along the extension direction of the rotating shaft of the working assembly. This arrangement can make the center of gravity of the battery pack assembly and the center of gravity of the drive motor close to the extension direction of the rotating shaft of the working assembly, thereby enhancing the downward pressing force of the rotating shaft of the working assembly in the extension direction, thereby effectively improving the up and down jumping problem of the working assembly during the work process, and improving the working effect and efficiency of the working assembly; at the same time, it can also reduce the operator's vibration feel and improve the user's operating comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0018] FIG1 is a schematic axial view of an embodiment of a power tool of the present invention;

[0019] FIG2 is a three-dimensional schematic diagram of an embodiment of the power tool of the present invention from another angle;

[0020] FIG3 is a side view of an embodiment of a power tool of the present utility model;

[0021] FIG4 is a front view of an embodiment of a power tool of the present utility model;

[0022] FIG5 is a top view of an embodiment of a power tool of the present utility model;

[0023] FIG6 is a partial cross-sectional view of an embodiment of the power tool of the present utility model;

[0024] FIG7 is a partial cross-sectional view of another embodiment of the power tool of the present utility model;

[0025] FIG8 is a schematic diagram of the box structure of an embodiment of the power tool of the present utility model;

[0026] FIG9 is a schematic diagram of a partial structure of an embodiment of the power tool of the present invention after removing the first cover plate and the second cover plate;

[0027] FIG10 is a schematic structural diagram of a battery pack installation cavity within a first housing in an embodiment of a power tool according to the present invention;

[0028] FIG11 is a schematic diagram of a partial structure of a second housing within a first housing in an embodiment of a power tool of the present utility model;

[0029] FIG12 is a schematic structural diagram of an embodiment of a power tool according to the present invention in which a control panel is installed above a drive motor;

[0030] FIG13 is a schematic structural diagram of an embodiment of a power tool according to the present invention, in which the control panel is installed toward the side wall of the first housing.

[0031] Component number description

[0032] 100, power tool; 110, frame; 120, shield; 130, battery pack assembly; 131, battery pack unit; 140, drive device; 141, drive motor; 142, reduction gearbox; 150, working assembly; 151, rotary shaft; 1511, rotary shaft unit; 152, working unit; 160, push rod; 170, travel wheel assembly; 171, travel wheel; 172, support shaft; 180, first straight line; 1 81. Second straight line; 190. First shell; 191. Accommodation cavity; 192. Battery pack installation cavity; 1921. Wiring terminal; 193. First cover; 194. Second cover; 195. First air inlet; 196. Support member; 197. First air outlet; 198. Second shell; 1981. Second air inlet; 1982. Second air outlet; 199. Control panel; 1991. Heat sink; 1992. Air duct. DETAILED DESCRIPTION

[0033] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless there is a conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific implementation methods, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0034] When numerical ranges are given in the examples, it should be understood that, unless otherwise specified herein, both endpoints of each numerical range and any value between the endpoints may be used. Unless otherwise defined, all technical and scientific terms used in this utility model are consistent with the prior art as understood by those skilled in the art and the description of this utility model. Any prior art methods, equipment, and materials similar or equivalent to those described in the examples of this utility model may also be used to implement this utility model.

[0035] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0036] Please refer to Figures 1 to 13. The present invention provides a power tool 100. The power tool 100 arranges the battery pack assembly 130 and the drive motor 141 above the rotating shaft 151 of the working assembly 150 and arranges them along the extension direction of the rotating shaft 151 of the working assembly 150. This allows the center of gravity of the battery pack assembly 130 and the center of gravity of the drive motor 141 to be distributed in the extension direction of the rotating shaft 151 of the working assembly 150, thereby enhancing the downward pressing force of the rotating shaft 151 of the working assembly 150 in the extension direction, thereby effectively improving the up and down jumping problem of the working assembly 150 during operation, improving the operating effect and efficiency of the working assembly 150; at the same time, it can also reduce the operator's vibration feel and improve the user's operating comfort.

[0037] Please refer to Figures 1 to 6. The power tool 100 includes: a frame 110, a battery pack assembly 130, a drive device 140 and a working assembly 150. The structural formation of the frame 110 is not limited, and the structure of the frame 110 of the existing power tool 100 can be referred to. In order to facilitate the movement of the power tool 100, a push rod 160 and a travel wheel assembly 170 are installed on the frame 110. The travel wheel assembly 170 includes two travel wheels 171 and a support shaft 172. The support shaft 172 is rotatably connected to the frame 110. The two travel wheels 171 are respectively fixedly connected to the two ends of the support shaft 172. The driving member installed on the frame 110, such as a drive motor, a reduction motor, etc., drives the support shaft 172 to rotate through a transmission mechanism. The support shaft 172 drives the travel wheels 171 to rotate, thereby driving the frame 110 to move. In other embodiments, the support shaft 172 may be fixedly connected to the frame 100, with the two travel wheels 171 rotatably connected to the ends of the support shaft 172. A driving member, such as a drive motor or a reduction motor, mounted on the frame 110 drives the travel wheels 171 to rotate via a transmission mechanism, thereby driving the frame 110 to move. The push rod 160 may be mounted at the front or rear end of the frame 110. The push rod 160 may be fixedly connected to the frame 110 or rotatably connected to the frame 110. The operator uses the push rod 160 to push the frame 110 to move. The frame 110 is also provided with a shield 120, which is fixedly connected to the frame 110 by, but not limited to, bolts. The shield 120 may be a frame structure or a sheet metal structure, as long as it meets strength and installation requirements. In this embodiment, the shield 120 is a sheet metal structure. The power end of the drive device 140 is fixedly connected to the top of the shield 120 by bolts, and the transmission end of the drive device 140 is installed below the shield 120. The power end of the drive device 140 can be a motor, a motor + reducer, or a hydraulic motor, and the transmission end of the drive device 140 can be a gear assembly, a sprocket assembly, or a worm gear assembly. In this embodiment, the drive device 140 includes a drive motor 141 and a reduction gear box 142. The drive motor 141 is fixedly connected to the top of the shield 120 by bolts, and the reduction gear box 142 is fixedly connected to the bottom of the shield 120 by bolts. The output shaft of the drive motor 141 passes through the shield 120 and is connected to the input end of the reduction gear box 142 below. It should be noted that the drive device 140 can also be installed below the shield 120, as long as the installation position of the drive device 140 is ensured to be above the rotating shaft 151. In other embodiments, the protective cover 120 may not be provided on the frame 110 , and the battery pack assembly 130 , the driving device 140 and the working assembly 150 may be directly mounted on the frame 110 .

[0038] Working assembly 150 includes a rotating shaft 151 and multiple working units 152. The working units 152 are fixedly connected to the rotating shaft 151 and arranged sequentially along the extension direction of the rotating shaft 151. The rotating shaft 151 is fixedly connected to the output end of the reduction gearbox 142. The drive motor 141 rotates, driving the reduction gearbox 142. The reduction gearbox 142 drives the rotating shaft 151 to rotate, which in turn drives the working units 152 to rotate and perform corresponding operations.

[0039] It should be noted that the power tool 100 in the present invention can be a scarifier, a lawn rake, or a sweeper, etc., and the corresponding working components 150 are respectively a scarifier blade, a lawn rake blade, or a sweeping brush, etc.; and the corresponding working units 152 are respectively a scarifier blade, a lawn rake blade, a sweeping brush unit, etc. The specific selection of the working components 150 should be determined according to the actual operation requirements of the power tool 100.

[0040] The battery pack assembly 130 is fixedly connected to the shield 120 by, but not limited to, bolts. The battery pack assembly 130 is electrically connected to the drive motor 141 to provide electrical energy for the operation of the drive motor 141. The battery pack assembly 130 can be installed above the shield 120 or below the shield 120, as long as the installation position of the battery pack assembly 130 is above the rotating shaft 151. In this embodiment, the battery pack assembly 130 is installed above the shield 120; this not only facilitates the electrical connection between the battery pack assembly 130 and the drive motor 141, but also saves installation space in the height direction, thereby improving the compactness of the overall structure of the power tool 100. The installation positions of the battery pack assembly 130 and the drive motor 141 on the shield 120 are arranged along the extension direction of the rotating shaft 151 of the working assembly 150. Specifically, the rotation axis 151 of the working assembly 150 extends in the same direction as the length of the shield 120 (as shown by the X-axis in FIG. 5 ). The battery pack assembly 130 and the drive motor 141 are arranged sequentially along the length of the shield 120. Along the length of the shield 120, the battery pack assembly 130 and the drive motor 141 can be located at one end of the rotation axis 151, at either end, or both in the middle of the axis 151. This arrangement places the center of gravity of the battery pack assembly 130 and the drive motor 140 close to the axis of the rotation axis 151 and along the axis of the rotation axis 151. This enhances the downward pressure on the rotation axis 151 in the extended direction. This effectively reduces the problem of up and down bouncing that occurs when the working assembly 150 is operating, improving the effectiveness and efficiency of the working assembly 150. It also reduces vibration felt by the operator, enhancing user comfort.

[0041] Referring to Figures 2, 6, and 7, in one example of the power tool 100 of the present invention, the drive device 140 is positioned midway along the extension of the rotary shaft 151 of the working assembly 150. The rotary shaft 151 comprises two rotary shaft units 151, symmetrically positioned at either end of the reduction gearbox 142 and connected to the two output terminals of the reduction gearbox 142. This reduces rotational synchronization errors between the rotary shaft units 151, ensuring uniform and consistent operating performance of the working assembly 150. The battery pack assembly 130 comprises a plurality of battery pack units 131, one located on either side of the drive device 140. There may be two or more battery pack units 131; in this embodiment, two are provided. The battery pack unit 131 may comprise a single battery pack or multiple battery packs, and the two battery pack units 131 may be connected in series, in parallel, or in series-parallel. Along the length direction of the shield 120, the two battery pack units 131 are respectively arranged on both sides of the drive motor 141. Along the width direction of the shield 120 (as shown by the Y-axis in Figure 5), the two battery pack units 131 can be located on the same side of the rotating shaft 151, or they can be located on both sides of the rotating shaft 151. However, it should be noted that along the width direction of the shield 120, the two battery pack units 131 are both arranged at an axial position close to the rotating shaft 151. In this way, the battery pack units 131 on both sides respectively generate a consistent downward pressure on the rotating shaft 151 units on both sides, thereby ensuring the consistency of the pressure effect of the rotating shaft 151 units on both sides, and further ensuring the consistency of the working effect on both sides of the working component 150.

[0042] Although the consistency of the compression effect on the rotating shaft 151 units on both sides can be improved by simply placing the center of gravity of the two battery packs on either side of the drive motor 141, preferably, as shown in Figure 7, in an example of the power tool 100 of the present invention, the two battery pack units 131 are symmetrically placed on both sides of the drive motor 141 along the length of the shield 120. This ensures that the rotating shaft 151 units on both sides are subjected to a completely consistent compression effect, thereby further improving the consistency of the compression effect on the rotating shaft 151 units on both sides. Further, referring to Figures 5 to 7, the projections of the center of gravity of the drive motor 141 and the center of gravity of the battery pack units 131 on the horizontal plane are arranged along a first straight line 180 (as shown by the dotted line in Figure 5), and the projection of the rotating shaft 151 on the horizontal plane is a second straight line 181 (as shown by the dotted line in Figure 5), and the first straight line 180 and the second straight line 181 are parallel. Along the travel direction of the power tool 100 (as shown by the Y-axis in FIG. 5 ), the first straight line 180 can be located in front of the axis of the rotating shaft 151, or behind the axis of the rotating shaft 151, or can even coincide with the axis of the rotating shaft 151. This allows the drive motor 141 and the battery pack unit 131 to generate a more uniform and stable downward force in the direction of the rotating shaft 151, further improving the uniformity of the operating effect of the working assembly 150.

[0043] Referring to Figures 2, 6, 7, 8, and 9, in one example of the power tool 100 of the present invention, a first housing 190 is provided above the shield 120. The first housing 190 is fixedly connected to the shield 120 by, but not limited to, bolts. The first housing 190 can be a frame structure or any other structure, such as a box structure. In this embodiment, the first housing 190 is a box structure. The first housing 190 is provided with a housing cavity 191. The drive motor 141 and the two battery pack units 131 are both mounted within the housing cavity 191. The mounting method includes, but is not limited to, bolting. By providing the first housing 190, on the one hand, the first housing 190 can protect the drive motor 141 and the battery pack unit 131, reducing the probability of damage. On the other hand, the drive motor 141 and the battery pack unit 131 can be integrated within the first housing 190, thereby making the overall structure of the power tool 100 more compact and the appearance more beautiful.

[0044] Furthermore, to further lower the center of gravity of the first housing 190, as shown in FIG7 , in one example of the power tool 100 of the present invention, the bottom of the battery pack unit 131 is positioned lower than the top of the drive motor 141 along the height direction of the first housing 190. This lowers the center of gravity of the battery pack unit 131, thereby lowering the center of gravity of the first housing 190 and improving the operational stability of the power tool 100.

[0045] Referring to Figures 5 and 6, in one embodiment of the power tool 100 of the present invention, along the travel direction of the power tool 100, the center of gravity of the first housing 190 and the axis of the support shaft 172 of the travel wheel 171 assembly are located on either side of the axis of the rotary shaft 151. The axis of the support shaft 172 is parallel to the axis of the rotary shaft 151, and the push rod 160 is positioned on one side of the travel wheel 171 assembly. This arrangement facilitates the balance of the center of gravity of the travel wheel 171 assembly in the front-to-back direction. When the working assembly 150 is not in operation, the operator can lift the working assembly 150 by pressing the push rod 160 end with less effort, thereby facilitating long-distance transportation of the power tool 100. It should be noted that, along the extension direction of the rotary shaft 151, the center of gravity of the first housing 190 can be located in the middle of the rotary shaft 151 or offset to one end of the rotary shaft 151. However, in this embodiment, the center of gravity of the first housing 190 is preferably located near the middle of the longitudinal direction of the rotary shaft 151. This can further ensure the balance of the center of gravity of the traveling wheel 171 assembly on both sides, and further improve the stability of the power tool 100 when being pushed.

[0046] Please refer to Figure 6. In an example of the power tool 100 of the present invention, a battery pack mounting cavity 192 is further provided in the first shell 190, and the battery pack unit 131 is accommodated in the battery pack mounting cavity 192. The number of battery pack mounting cavities 192 corresponds to the number of battery pack units 131. In this embodiment, please refer to Figures 6, 9 and 10. Two battery pack mounting cavities 192 are provided in the first shell 190, and the two battery pack units 131 are respectively installed in the two battery pack mounting cavities 192. The battery pack mounting cavity 192 can be a separate cavity fixedly connected to the first shell 190, or it can be an integral structure integrally formed with the first shell 190, as long as a stable connection of the battery pack unit 131 in the first shell 190 can be achieved. To facilitate electrical connection between battery pack unit 131 and battery pack mounting cavity 192, a first housing 190 is provided with connection terminals 1921. When battery pack unit 131 is inserted into battery pack mounting cavity 192, connection terminals 1921 are established between battery pack unit 131 and drive motor 141, thereby achieving electrical connection between battery pack unit 131 and drive motor 141. The provision of battery pack mounting cavity 192 not only ensures a stable connection of battery pack unit 131 within first housing 190 but also facilitates electrical connection between battery pack unit 131 and drive motor 141.

[0047] Furthermore, to facilitate insertion and removal of the battery pack unit 131 into and out of the battery pack mounting cavity 192, in one embodiment of the present invention, as shown in Figures 8 and 10 , the opening of the battery pack mounting cavity 192 faces upward along the height of the first housing 190. A first cover plate 193 seals the opening of the battery pack mounting cavity 192, preventing dust and impurities from entering the battery pack mounting cavity 192 and minimizing the impact on the electrical connection of the battery pack unit 131.

[0048] Referring to Figures 6, 8, and 9, in one example of the power tool 100 of the present invention, a second cover 194 is provided at the opening of the first housing 190. This cover covers the area between the two battery pack mounting cavities 192. A first air inlet 195 is formed between the second cover 194 and the sidewalls of the first housing 190. Specifically, opposing supports 196 are provided on the sidewalls of the first housing 190, located in the area between the two battery pack mounting cavities 192. These supports 196 have a substantially U-shaped groove structure. The length direction of the support member 196 is consistent with the height direction of the first shell 190, the outer wall of the support member 196 is in contact with the inner surface of the side wall of the first shell 190, one end of the support member 196 in the length direction extends to the bottom of the first shell 190, and the other end of the support member 196 in the length direction is higher than the upper end surface of the first shell 190; the second cover plate 194 is a rectangular concave cavity structure, the length dimension of the second cover plate 194 is greater than the width dimension of the first shell 190, and the depth of the concave cavity of the second cover plate 194 is greater than the height dimension of the support member 196 extending out of the upper end surface of the first shell 190, and the second cover plate 194 covers the upper ends of the two oppositely arranged support members 196. The long sidewalls of the second cover plate 194 abut against the upper end surface of the first housing 190, forming a first gap between the bottom surface of the concave cavity of the second cover plate 194 and the end surface of the support member 196. Both ends of the short sidewalls of the second cover plate 194 extend to the outside of the sidewalls of the first housing 190, forming a second gap between the second cover plate 194 and the sidewalls of the first housing 190. The second gap is connected to the first gap, together forming a first air inlet 195. The first housing 190 is provided with a first air outlet 197 on the sidewall opposite the drive motor 141. To reduce the entry of large external particles of impurities into the interior of the first housing 190 through the first air outlet 197, the first air outlet 197 is a grid-like barrier structure.

[0049] Referring to Figures 6, 7, and 11, a second housing 198 is also disposed within the first housing 190. The second housing 198 is fixedly connected to the bottom wall of the first housing 190 by, but not limited to, bolts. The drive motor 141 is disposed within the second housing 198. The second housing 198 has a plurality of second air inlets 1981 formed near the bottom wall of the first housing 190. These second air inlets 1981 communicate with the interior of the first housing 190, further connecting the second air inlets 1981 to the first air inlet 195. A second air outlet 1982 is formed at the top of the second housing 198, near the location of the cooling fan for the drive motor 141. The second air outlet 1982 extends to and communicates with the first air outlet 197. When the drive motor 141 is running, the cooling fan of the drive motor 141 allows air from the outside of the first housing 190 to enter the first housing 190 through the first air inlet 195, then enter the second housing 198 through the second air inlet 1981, then flow through the drive motor 141 and be discharged from the second air outlet 1982 at the upper end of the second housing 198, and finally be discharged to the outside of the first housing 190 through the first air outlet 197. This arrangement increases the air flow velocity near the drive motor 141 and improves the heat dissipation effect of the drive motor 141.

[0050] Of course, if the beneficial effects of the above solution are not considered, the second cover plate 194 may not be provided on the first shell 190, and the second shell 198 may not be provided inside the first shell 190. Air may flow in naturally through the opening position of the first shell 190 to cool the drive motor 141 naturally.

[0051] Referring to Figures 6, 7, 9, and 12, in one example of the power tool 100 of the present invention, a control board 199 is further disposed within the first housing 190. The control board 199 is positioned between the two battery pack units 131 and above the drive motor 141. The control board 199 can be connected to either the first housing 190 or the second housing 198, as long as it can be secured within the first housing 190. The control board 199 is electrically connected to the drive motor 141 to control its operation. It is also electrically connected to the battery pack units 131 to supply power to the control board 199. Placing the control board 199 between the two battery pack units 131 and above the drive motor 141 facilitates electrical connections between the control board 199, the battery pack units 131, and the drive motor 141.

[0052] Furthermore, to improve the heat dissipation of the control board 199, in one example of the power tool 100 of the present invention, as shown in Figures 6 and 7, a heat sink 1991 is provided on the side of the control board 199 facing away from the drive motor 141. Along the height of the first housing 190, the first air inlet 195 is located above the heat sink 1991, and the second air inlet 1981 is located below the heat sink 1991. With this arrangement, when air enters through the first air inlet 195, it first flows through the heat sink 1991 on the control board 199, then enters the second housing 198 through the second air inlet 1981, and finally exits the first housing 190 through the second air outlet 1982 and the first air outlet 197, in sequence. This significantly improves the heat dissipation of the control board 199.

[0053] Referring to FIG. 13 , in one embodiment of the power tool 100 of the present invention, a control board 199 is disposed between the two battery pack units 131 and between the drive motor 141 and the sidewall of the first housing 190. Preferably, the heat sink 1991 of the control board 199 faces the sidewall of the first housing 190, with at least a portion of the heat sink 1991 facing the support member 196 mounted on the sidewall of the first housing 190. Preferably, to avoid interference with the first air outlet 197 of the first housing 190, in this embodiment, the control board 199 is disposed between the drive motor 141 and the sidewall of the first housing 190 not provided with the first air outlet 197, with the heat sink 1991 facing the sidewall of the first housing 190 not provided with the first air outlet 197. Along the height of the first housing 190, the bottom end of the control board 199 is located above the second air inlet 1981. With this arrangement, a flow passage 1992 is formed between heat sink 1991 and the U-shaped groove of support member 196. The upper end of flow passage 1992 communicates with first air inlet 195, and the lower end of flow passage 1992 communicates with second air inlet 1981. When air enters through first air inlet 195 and flows through flow passage 1992, it simultaneously dissipates heat from heat sink 1991 on control board 199, thereby improving the heat dissipation of control board 199.

[0054] It should be noted that in the embodiment shown in FIG13 , the control board 199 is disposed between the two battery pack units 131. This may mean that the width of the control board 199 is completely located between the two battery pack units 131, or that the control board 199 partially overlaps the width between the two battery pack units 131 (as shown by the W axis in FIG13 ). The specific situation depends on the actual size of the control board 199 and is not specifically limited thereto.

[0055] In the power tool 100 of the present invention, the battery pack assembly 130 and the drive motor 141 are both arranged above the rotating shaft 151 of the working assembly 150 and arranged along the extension direction of the rotating shaft 151 of the working assembly 150, so that the center of gravity of the battery pack assembly 130 and the center of gravity of the drive motor 141 are both distributed in the extension direction of the rotating shaft 151 of the working assembly 150, thereby enhancing the downward pressing force of the rotating shaft 151 of the working assembly 150 in the extension direction, thereby effectively improving the up and down jumping problem of the working assembly 150 during operation, improving the working effect and efficiency of the working assembly 150; at the same time, it can also reduce the operator's vibration feel and improve the user's operating comfort; in addition, by arranging the battery pack assembly 130 and the drive motor 141 in the first shell 190, and making the center of gravity of the first shell 190 close to the center position of the rotating shaft 151, the overall appearance structure of the power tool 100 can be made more compact, the center of gravity of the power tool 100 is more balanced, and the stability during pushing is better. Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utility value and practical significance. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons of ordinary skill in the art without departing from the spirit and technical concepts disclosed in the present invention shall be covered by the claims of the present invention.

Claims

1. A power tool, characterized in that: include: frame; A battery pack assembly, mounted on the frame, to provide energy for the power tool; A driving motor is mounted on the frame; A working assembly is mounted on the frame and rotated by the driving motor; Wherein, the battery pack assembly and the driving motor are located above the rotating shaft of the working assembly and are arranged along the extending direction of the rotating shaft of the working assembly.

2. The power tool according to claim 1, characterized in that: The driving motor is arranged at a middle position in the extension direction of the rotating shaft of the working component, and the battery pack assembly includes a plurality of battery pack units, and the plurality of battery pack units are respectively located on both sides of the driving motor.

3. The power tool according to claim 2, characterized in that: The plurality of battery pack units are symmetrically arranged on both sides of the driving motor.

4. The power tool according to claim 2, characterized in that: A first shell is provided on a side of the frame facing away from the working assembly, and the drive motor and the battery pack assembly are mounted on the first shell.

5. The power tool according to claim 4, characterized in that: A travel wheel assembly and a push rod are also installed on the frame. Along the travel direction of the power tool, the rotating axis of the working assembly is arranged between the center of gravity of the first shell and the center of gravity of the travel wheel assembly, and the push rod is arranged on a side close to the travel wheel.

6. The power tool according to claim 4, characterized in that: A battery pack installation cavity is provided in the first shell, and the battery pack unit is accommodated in the battery pack installation cavity.

7. The power tool according to claim 4, characterized in that: The power tool further comprises a transmission assembly. The drive motor is arranged in the first housing. The drive motor is transmission-connected to the working assembly via the transmission assembly.

8. The power tool according to claim 7, characterized in that: The first shell has a first air inlet and a first air outlet; a second shell is arranged inside the first shell, the drive motor is arranged inside the second shell, the second shell has a second air inlet and a second air outlet, the second air inlet is connected to the first air inlet, and the second air outlet is connected to the first air outlet.

9. The power tool according to claim 7, characterized in that: A control board is also disposed in the first shell, and the control board is disposed between the plurality of battery pack units and located above the drive motor.

10. The power tool according to claim 8, characterized in that: A control board is also arranged in the first shell, and the control board includes a heat sink, and the heat sink is arranged between the first air inlet and the second air inlet.

11. The power tool according to claim 8, characterized in that: A control board is also arranged in the first shell, and the control board includes a heat sink. An air flow duct is formed between the heat sink and the side wall of the first shell, and two ends of the air flow duct are respectively connected to the first air inlet and the second air inlet.

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