Power tool

Abstract

The utility model relates to an electric tool, including work subassembly and power supply subassembly, work subassembly includes first casing, the accommodating cavity surrounded by first casing and the motor assembly contained to the accommodating cavity, and the motor assembly includes the drive shaft along the axial extension, the second casing of setting up on the drive shaft and with first casing connection stator support, and the motor assembly is electrically connected to power supply subassembly through the cable, stator support includes the air outlet of intercommunication second casing inside and outside and the wire slot with air outlet intercommunication, and the cable passes through air outlet and wire slot to connect to power supply subassembly, the utility model discloses a wire slot is set up on stator support to the cable of motor assembly passes through and to its pressure tight fixing, need not extra setting pressure wire device to realize the wire pressure function, has reduced the part quantity of complete machine and reduced production cost.

Description

Technical Field

[0001] This utility model relates to the field of garden tool technology, and in particular to an electric tool. Background Technology

[0002] Currently, the existing front-mounted motor lawn mowers fix the three-phase wiring harness of the motor by setting a pressure plate on the motor stator bracket and fixing it with screws to secure the motor wiring harness. This results in a large number of parts inside the front head housing of the lawn mower, the whole machine is not lightweight enough, and it is inconvenient for users to disassemble and assemble.

[0003] In view of the above problems, it is indeed necessary to provide a power tool to overcome the shortcomings of the prior art. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a power tool that can reduce the number of parts inside the working head to achieve a compact and lightweight spatial layout of the working head.

[0005] The present invention addresses the existing technical problems by adopting the following technical solution: an electric tool, comprising a working component and a power supply component, wherein the working component comprises a first housing, a receiving cavity enclosed by the first housing, and a motor assembly received within the receiving cavity, the motor assembly comprising a drive shaft extending axially, a second housing sleeved on the drive shaft, and a stator bracket connected to the first housing, the motor assembly being electrically connected to the power supply component via a cable; the stator bracket comprising an air outlet communicating between the inner and outer sides of the second housing and a wire groove communicating with the air outlet, the cable passing through the air outlet and the wire groove to connect to the power supply component. A further improvement is as follows: the stator support includes a base fixed to the first housing, the air outlet passes through the base axially, and the wire groove passes through the base radially perpendicular to the axial direction.

[0006] A further improvement is as follows: the base includes a pressure line portion extending radially, the first housing includes a rib extending radially from its inner sidewall toward the drive shaft, and the pressure line portion and the rib portion are axially spaced to form the groove.

[0007] A further improvement is that the pressure line portion is located radially outside the air outlet and protrudes axially upward from the plane where the base is located, so as to form the groove with the rib.

[0008] A further improvement is as follows: the air outlet and the wire groove together form part of the wiring channel, which includes a first channel located near the bottom of the motor assembly and arranged radially, a second channel formed by the air outlet, and a third channel formed by the wire groove.

[0009] A further improvement is as follows: the stator support includes a baffle extending axially from the base into the second housing, the first channel is located radially within the baffle, the second channel is perpendicular to the first channel, and the third channel is parallel to the first channel.

[0010] A further improvement is as follows: the baffle and the base surround to form the air outlet, and the groove is located axially between the upper and lower ends of the air outlet.

[0011] A further improvement is as follows: the base includes a fixing part for fixing the stator bracket to the bottom of the first housing, the fixing part includes several through holes, a connecting plate is formed between two of the through holes, and the wire groove is located on the connecting plate.

[0012] A further improvement is as follows: the first housing includes a connecting portion extending outward from its outer peripheral wall and a first air inlet communicating with the receiving cavity, and the wire groove is disposed close to the first air inlet.

[0013] A further improvement is as follows: the power tool includes a handle assembly, a connecting assembly connecting the handle assembly and the working assembly, and a power supply assembly connected to the handle assembly. The connecting assembly is connected to the connecting part, and the cable passes sequentially through the air outlet, the cable groove, the first air inlet, and the connecting assembly to electrically connect the motor assembly and the power supply assembly.

[0014] Compared with the prior art, the present invention has the following advantages: by setting a wire groove on the stator bracket to allow the power motor components’ cables to pass through and be pressed and fixed, the wire pressing function can be achieved without setting an additional wire pressing device, which reduces the number of parts in the whole machine and lowers production costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the power tool of this utility model; Figure 2 yes Figure 1 A cross-sectional view of the working components of the power tool shown; Figure 3 yes Figure 1 A cross-sectional view of the working components of the power tool shown from another angle; Figure 4 yes Figure 1 A cross-sectional view of the motor assembly shown; Figure 5 yes Figure 4 A cross-sectional view of the stator support of the motor assembly shown; Figure 6 yes Figure 4The top view of the stator support shown; Meaning of the reference numerals in the diagram: Detailed Implementation

[0016] 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. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0017] Please see Figure 1 The diagram shows the structure of the power tool 100 of this utility model. The power tool 100 of this utility model includes a working component 10, a handle assembly 30 disposed opposite to the working component, and a connecting assembly 20 connecting the handle assembly and the working component. The working component 10 includes an actuating component 11 and a cutting component 12 for mowing. The handle assembly 30 includes a main handle 31 away from the working component 10 and an auxiliary handle 32 closer to the working component 10. The main handle 31 is provided with a control component for user operation, and the control component includes an adjustment button 33 for user adjustment.

[0018] The power tool 100 also includes a power supply component 40 for providing power to the working component and connected to the handle assembly 30. The motor assembly 13 is connected to the power supply component 40 via cables. The power supply component 40 includes two battery packs (not shown) connected in series and a battery pack mounting part 41 for vertically placing the battery packs. The two battery packs are vertically inserted into both sides of the battery pack mounting part 41, which facilitates the miniaturization of the power supply component 40 of the power tool 100. Specifically, the power tool 100 in this invention is a lawnmower; in other embodiments, it could also be a brush cutter, etc.

[0019] Please see Figures 2 to 3 As shown, the power tool 100 includes a working component 10 located at its front end. The working component 10 includes a first housing 101, a receiving cavity 102 enclosed by the first housing 101, and a motor assembly 13 received in the receiving cavity 102. The motor assembly 13 includes a drive shaft 131 extending axially, a second housing 132 sleeved on the drive shaft 131, and a stator bracket 133 connected to the first housing 101.

[0020] In this embodiment, the first housing 101 of the power tool 100 is a split design, comprising an upper housing and a lower housing, which are fixedly connected by screws to form the receiving cavity 102. The upper housing is configured as a cover plate, and the lower housing is configured as an upwardly open cylinder. A connecting portion 103 extends outward from the outer peripheral wall of the lower housing, and the connecting portion 103 is used to connect with the connecting assembly 20. In this embodiment, the drive motor in the working assembly 10 at the front end of the lawnmower 100 is an external rotor motor, and the second housing 132 is the rotor housing sleeved on the drive shaft 131.

[0021] In this embodiment, the stator bracket 133 is directly fixed to the bottom of the lower housing. The connection between the stator bracket 133 and the first housing 101 can refer to either a direct or indirect connection. In other embodiments, a reduction gear may be provided below the motor assembly 13. In this case, the stator bracket 133 is directly fixed to the reduction gear, and the reduction gear is fixed to the first housing 101 by screws. Therefore, the stator bracket 133 is indirectly fixed to the first housing 101. Even in this indirect case, the stator bracket 133 is still within the scope of protection of this utility model.

[0022] Since the stator support 133 is a fixed component and the second housing 132, i.e. the rotor housing, is a movable component, the stator support 133 and the second housing 132 are spaced apart axially in the structure design to prevent interference between the two when the motor assembly 13 is in place, which would affect the normal operation of the motor assembly.

[0023] Please see Figures 4 to 6 As shown, the stator bracket 133 includes an air outlet 139 connecting the inner and outer sides of the second housing 132 and a wire groove 130 communicating with the air outlet 139. The cable passes through the air outlet 139 and the wire groove 130 to connect to the power supply component 40.

[0024] The cable of the motor assembly 13 passes through the air outlet 139 of the stator bracket 133, and then exits through the wire groove 130 provided on the stator bracket 133 to the outside of the second housing 132. The cable further extends to the connecting part 103, and the connecting component 20 is connected to the working component 10 through the connecting part 103. The connecting component 20 is configured as a hollow channel. The cable extends to the connecting part 103 and further extends through the hollow channel of the connecting component 20 to connect with the control board inside the handle assembly 30. By providing the wire groove 130 on the stator bracket 133 for the cable to pass through, it is easy to organize the cable of the motor assembly 13, so that the cable is not messy. The air outlet 139 and the wire groove together form a cable routing channel to fix the cable, which can save space in the first housing 101 and make the spatial layout more compact.

[0025] The stator support 133 includes a base 1330 fixed to the first housing 101, an air outlet 139 extending axially through the base 1330, and a wire groove 130 extending radially perpendicular to the axial direction through the base 1330. The air outlet 139 is configured as an oblong air outlet to allow cooling airflow flowing into the motor assembly 13 to exit from the air outlet 139.

[0026] The stator support 133 also includes a support column for the coil winding sleeve. The support column extends axially from the central boss of the stator support 133 and is located within the second housing 132. The air outlet 139 is located between the base 1330 of the stator support 133 and the support column, with a gap between the air outlet 139 and the support column. While ensuring the supporting strength of the base 1330, the gap between the air outlet 139 and the support column is kept as small as possible to increase the diameter of the air outlet and thus increase the flow of cooling air from the inside of the motor assembly 13.

[0027] The base 1330 of the stator support 133 includes a radially extending pressure portion 1301. The first housing 101 includes a rib 106 extending radially from its inner sidewall toward the drive shaft 131. The pressure portion 1301 and the rib 106 are axially spaced to form the wire groove 130. The cable of the motor assembly 13 passes through the wire groove 130 and is pressed and fixed during assembly by the pressure portion 1301 and the rib 106. The cable of the motor assembly 13 can be pressed and fixed without additional fixing devices, which helps to reduce the number of parts in the whole machine and simplify the assembly process.

[0028] The pressure part 1301 is located radially outside the air outlet 139 and protrudes axially upward from the plane of the base 1330 to form the wire groove 130 with the rib 106. Therefore, the wire groove 130 is also located radially outside the air outlet 139, and the wire groove 130 penetrates the base 1330 radially perpendicular to the axial direction. Since the air outlet 139 is located on the base 1330, the wire groove 130 also communicates with the air outlet 139 to jointly form part of the wiring channel.

[0029] The wiring channels include a first channel 1331 located near the bottom of the motor assembly 13 and arranged radially, a second channel 1332 formed by the air outlet 139, and a third channel 1333 formed by the cable groove 130. The cable passes through the first channel 1331, the second channel 1332, and the third channel 1333 sequentially from the bottom of the motor assembly 13 and extends to the connecting portion 103. The cable extends out of the first housing 101 through these three channels. The design of the three channels allows the cable to pass through the bottom of the motor assembly 13 neatly and smoothly. On the one hand, designing multiple channels for the cable to pass through prevents the cable from being exposed and damaged. On the other hand, it facilitates the organization of the cable and saves space inside the first housing 101, and facilitates the flow of cooling air inside the motor assembly 13 for effective heat dissipation.

[0030] The stator support 133 includes a baffle 134 extending axially from the base 1330 into the second housing 132. The first channel 1331 is located radially within the baffle 134 to effectively utilize the space within the baffle 134 and achieve a compact spatial layout. The first channel 1331 extends radially perpendicular to the axial direction and is located within the baffle 134. The baffle 134 extends axially into the second housing 132, and the distance between the baffle 134 and the inner wall of the second housing 132 is small, allowing most of the cooling airflow to flow through the interior of the baffle 134. The baffle at least partially fills the gap between the stator support 133 and the second housing 132 to prevent the cooling airflow entering the motor assembly 13 from flowing through the gap between the stator support 133 and the second housing 132 to the outer periphery of the stator support 133, thereby reducing the loss of cooling airflow and improving the heat dissipation efficiency of the motor assembly 13.

[0031] The baffle 134 partially overlaps the second housing 132 in the radial direction, and the distance between the baffle 134 and the inner wall of the second housing 132 in the radial direction perpendicular to the axial direction is 0.2-2mm. This distance is designed to be as small as possible so that when the cooling airflow flows from top to bottom through the inside of the motor assembly, most of it enters the interior of the baffle 134, thereby reducing the airflow loss from the gap between the baffle 134 and the second housing 132.

[0032] The baffle 134 is integrally formed with the stator support 133. The baffle 134 extends axially from the base 1330 of the stator support 133, and the radial dimension of the baffle 134 is smaller than the radial dimension of the base 1330. The baffle 134 extends axially from the base 1330 toward the second housing 132 to cover the gap between the stator support 133 and the second housing 132 in the radial direction, so as to prevent the cooling airflow flowing through the motor assembly 13 from flowing out of the gap and causing the loss of cooling airflow.

[0033] The first channel 1331 is located inside the baffle 134 and can also use the cooling airflow flowing into the baffle 134 to cool the cable, further improving the heat dissipation efficiency of the motor assembly 13.

[0034] The second channel 1332 is perpendicular to the first channel 1331, meaning the second channel 1332 extends axially and passes through the air outlet 139 axially. The first channel 1331 and the second channel 1332 are connected, and the cable extends from the first channel 1331 to the second channel 1332. The second channel 1332 passes through any one of the air outlets 139 from top to bottom, and the cable passes through the air outlet 139 from the second channel 1332. The cable exits from the internal space of the stator bracket 133, which can effectively utilize the internal space and effectively cool the cable.

[0035] The third channel 1333 is arranged parallel to the first channel 1331. The third channel 1333 is arranged radially perpendicular to the axial direction and communicates with the second channel 1332. The third channel 1333 also includes a wire groove 130 formed by the wire pressing part 1301 and the rib 106. After the cable passes through the third channel 1333, it can extend to the connecting part 103. In addition, the third channel connects the air outlet 139 and the wire groove 130, so that the cable passes through the air outlet 139 of the base 1330 of the stator bracket 133 and passes through the wire groove 130 integrally formed by the stator bracket 133. Under the action of the wire pressing part 1301 and the rib 106 protruding upward from the base 1330 of the stator bracket 133, the cable is pressed and fixed to the internal space of the stator bracket by the wire pressing part 1301 and the rib 106. The space is formed by the baffle 134 and the base 1330.

[0036] The baffle 134 and the base 1330 surround and form the air outlet 139. The wire groove 130 is located axially between the upper and lower ends of the air outlet 139. The wire groove 130 communicates with the air outlet 139. In this embodiment, the air outlet 139 is configured as a waist-shaped air outlet, and there are four air outlets 139 evenly distributed on the base 1330. In this utility model, there is no limitation on the shape and number of the air outlets 139. Changes to the shape and number of the air outlets 139 in other embodiments are also within the scope of protection of this utility model.

[0037] The base 1330 includes a fixing part 1334 for fixing the stator bracket 133 to the bottom of the first housing 101. The fixing part 1334 includes several through holes 1336. A connecting plate 1335 is formed between two of the through holes 1336 near the first air inlet 104. The wire groove 130 is located on the connecting plate 1335.

[0038] The stator bracket 133 is fixed to the first housing 101 by the fixing part 1334. In this embodiment, the fixing part 1334 is configured as a semi-circular protrusion extending radially from the outer peripheral wall of the base 1330 to the outside of the second housing 132. The protrusion has a through hole 1336 in the middle for screws to pass through and fix the stator bracket 133 to the first housing 101.

[0039] In this embodiment, four fixing parts 1334 are provided. The present invention does not limit the shape and number of fixing parts 1334. Two adjacent fixing parts 1334 are connected to form the connecting plate 1335, and the remaining fixing parts 1334 are spaced apart on the outer periphery of the base 1330 of the stator support 133.

[0040] The connecting plate 1335 is configured as a straight plate extending from the side walls of two adjacent parts of the fixing part 1334. The connecting plate 1335 is located outside the second housing 132 and is disposed near the first air inlet 104. The wire groove 130 is located on the connecting plate 1335.

[0041] The first housing 101 includes a connecting portion 103 extending outward from its outer peripheral wall and a first air inlet 104 communicating with the receiving cavity 102. The cable groove 130 is disposed near the first air inlet 104, which facilitates the cable to pass smoothly out of the cable groove disposed on the stator support and extend to the connecting portion 103. The cable communicates with the hollow channel of the connecting assembly 20 through the connecting portion 103 to connect with the control assembly.

[0042] The power tool 100 includes a handle assembly 30, a connecting assembly 200 connecting the handle assembly 30 and the working assembly 10, and a power supply assembly 40 connected to the handle assembly. The connecting assembly 20 is connected to the connecting part 103. The cable passes through the air outlet 139, the cable groove 130, the first air inlet 104 and the connecting assembly 20 in sequence to electrically connect the motor assembly 13 and the power supply assembly 40.

[0043] Please see Figures 2 to 3 As shown, the power tool 100 includes a fan assembly, which includes a first fan 14 for generating the cooling airflow and a second fan 15 located at least partially outside the first housing 101 for discharging the cooling airflow from the first housing 101. The first housing 101 includes a connecting portion 103 extending outward from its outer peripheral wall and a first air inlet 104 communicating with the receiving cavity 102. The first air inlet 104 is located at the connection between the connecting portion 103 and the first housing 101 and is used to allow the cooling airflow to enter the receiving cavity 102.

[0044] The second housing 132 has a second air inlet 136 at one end away from the stator support 133 for the cooling airflow to enter. The outer wall of the second housing 132, the base 1330 of the stator support, the baffle 134 and the inner wall of the first housing 101 together form an airflow path between the first air inlet 104 and the second air inlet 136.

[0045] The cooling airflow enters the receiving cavity 102 enclosed by the first housing 101 from the first air inlet 104, then flows upward through the space defined by the base, baffle 134, outer wall of the second housing 132, and inner wall of the first housing 101 to the top of the second housing 132, and enters the interior of the motor assembly 13 from the second air inlet 136 of the second housing 132, thereby dissipating heat from the motor assembly 13. The baffle 134 extending axially from the stator support 133 prevents the cooling airflow entering the receiving cavity 102 from the first air inlet 104 from being directly sucked away by the second fan 15 through the gap between the stator support 133 and the second housing 132 before being discharged from the first housing 101, thus reducing cooling airflow loss.

[0046] The connecting assembly 20 of the lawnmower 100 forms a hollow channel. Several through holes (not shown) are provided below the connecting assembly 20 near the working assembly 13, communicating with the first air inlet 104. These through holes connect the hollow channel, the first air inlet 104, and the receiving cavity 102. By providing several through holes below the connecting assembly 20, the air intake volume is increased, thereby improving the cooling efficiency of the motor assembly.

[0047] The cooling airflow enters the hollow channel of the connecting component 20 through several through holes located below the connecting component 20, flows to the first air inlet 104 formed at the connecting part 103, the first air inlet 104 is connected to the receiving cavity 102 that houses the motor assembly 13, the cooling airflow enters the receiving cavity 102 from the first air inlet 104, and flows into the interior of the motor assembly 13 from the second air inlet 136 under the action of the first fan 14, thereby forming an airflow channel for cooling the motor assembly 13 in the second housing 132.

[0048] In this embodiment, the first fan 14 is an axial fan, and its blades 142 are designed to draw air from top to bottom when the motor assembly 13 rotates. The cooling airflow flows from the first air inlet 104 to the top of the motor assembly 13 under the negative pressure of the axial fan, and then enters the motor assembly 13 to cool it. In addition, the second fan 15 is specifically a centrifugal fan. The cooling airflow flowing through the motor assembly 13 is orderly discharged from the first housing 101 under the action of the centrifugal fan, thereby improving the cooling efficiency of the motor assembly 13.

[0049] The motor assembly 13 includes a stator support 133, a stator winding sleeved on the stator support 133, a drive shaft 131 extending axially and at least partially located outside the first housing 101, and a second housing 132 rotating together with the drive shaft 131. The motor assembly 13 also includes a plurality of magnets 135 connected to the second housing 132. The magnets 135 are correspondingly disposed to the stator winding. The magnets 135 are glued to the inner wall of the second housing 132, and the magnets 135 are spaced apart on the inner side of the second housing 132.

[0050] The baffle 134 is located axially on the bottom side of the magnet 135 and is nearly flush with the bottom side of the magnet 135. The radial distance between the magnet 135 and the drive shaft 132 is less than or equal to the radial distance between the baffle 134 and the drive shaft 131. This allows the cooling airflow to enter the motor assembly 13 from the second air inlet 136 at the top of the second housing 132, and after passing the inside of the magnet 135, it can be directly guided into the interior of the baffle 134, reducing airflow loss from the gap between the baffle 134 and the second housing 132.

[0051] The drive shaft 131 of the motor assembly 13 is provided with bearing support at both the upper and lower ends. The drive shaft 131 is provided with a first bearing 16 at the end near the first fan 14. The first bearing 16 is located outside the second housing 132 and near the upper housing of the first housing 101. The first bearing 16 abuts against the top wall of the first housing 101 to support the drive shaft 131.

[0052] A second bearing 17 is provided at one end of the drive shaft 131 near the second fan 15. The second bearing 17 is located between the stator bracket 133 and the second fan 15 to support the drive shaft 131, and the second bearing 17 abuts against the second fan 15. The second fan 15 cooperates with the drive shaft 131 and rotates together with the drive shaft 131. The second fan 15 is provided with a square keyway to cooperate with the flat keyway on the drive shaft 131. The second fan 15 rotates together with the drive shaft 131, which helps to improve the heat dissipation efficiency of the motor assembly 13.

[0053] Please see Figures 2 to 6As shown, the stator bracket 133 includes a through hole through which the drive shaft 131 passes. The through hole penetrates the stator bracket 133, and the stator bracket 133 includes a support column for the motor coil winding. The support column extends toward the top of the second housing 132. The support column is located in the middle of the stator bracket 133, and the axial height of the support column is less than the axial height of the stator winding. The top end of the stator winding abuts against a fixing post on the second housing 132. The first fan 14 is sleeved on the fixing post of the second housing 132. The first fan 14 is press-fitted between the second housing 132 and the stator winding to simplify the installation process of the motor assembly 13 and facilitate user operation.

[0054] The stator support 133 includes an air inlet side 137 formed by the baffle 134 for the cooling airflow to enter, and an air outlet side 138 located at the bottom of the stator support 133 for the cooling airflow to exit. The bottom of the stator support 133 also includes several air outlets 139, which are configured as waist-shaped air outlets. In this invention, the diameter of the air outlets 139 is designed to be relatively large so that most of the cooling airflow flows out from the bottom of the motor assembly 13.

[0055] The air outlet 139 is configured as a hollow portion between the base of the stator bracket 133 and the support column. The stator bracket 133 also includes a boss located in the middle. The support column extends upward from the boss, and several air outlets 139 are formed between the boss and the base of the stator bracket 133.

[0056] The base of the stator bracket 133 is designed to be larger in the radial direction than the baffle 134, thereby increasing the diameter of the air outlet 139, which helps to increase the airflow channel of the cooling airflow and thus improve the cooling efficiency of the motor assembly 13.

[0057] The top of the second housing 132 includes several second air inlets 136 for the flow of cooling air. Each second air inlet 136 is a waist-shaped ventilation hole. These waist-shaped ventilation holes are arranged at intervals around the drive shaft 131 in the circumferential direction of the second housing 132, facilitating the flow of cooling air into the motor assembly 13 for cooling. The second air inlets 136 correspond to the air outlets 139 of the stator bracket to allow for airflow. Specifically, the second air inlets 136 consist of three waist-shaped ventilation holes, and the air outlets 139 consist of four waist-shaped ventilation holes. In other embodiments, the number of ventilation holes can be two, four, or more. This invention does not limit the number of ventilation holes; the purpose of these ventilation holes is to facilitate the flow of cooling air within the second housing for effective cooling of the motor.

[0058] The side of the stator support 133 with a baffle 134 is the air inlet side 137. The baffle 134 can prevent the cooling airflow from flowing out of the stator support 133 through the gap between the stator support 133 and the second housing 132, so that most of the cooling airflow falls into the air inlet side 137 and flows out from the air outlet side 138. Similarly, the present invention follows the principle of minimizing the loss of cooling airflow, and designs the radial dimension of the air outlet side 138 to be greater than or equal to the radial dimension of the air inlet side 137, so that the cooling airflow will not hit the internal parts when flowing from top to bottom, thus avoiding the loss of cooling airflow, and effectively utilizing the cooling airflow to dissipate heat from the motor assembly 13.

[0059] The second housing 132 forms a downwardly open chamber, and a fixing post is provided in the middle of the second housing 132 for assembly with the first fan 14, so that the first fan 14 is formed inside the second housing 132. Unlike other embodiments where the first fan 14, i.e., the axial fan, is located outside the second housing 132, i.e., the rotor housing, the present invention designs the first fan 14 to be press-fitted into the second housing 132, which helps to simplify the assembly process and reduce production costs.

[0060] The second housing 132 and the stator support 13 are spaced apart in the axial direction to prevent interference between the second housing 132, which is a movable part, and the stator support 133, which is a fixed part, during rotation. Therefore, in order to fill the gap formed in the axial direction between the stator support 133 and the second housing 132, the stator support 133 includes a base 1330 that at least partially covers the chamber, and the baffle 134 extends from the base 1330 of the stator support 133 toward the first fan 14 to prevent the cooling airflow from flowing out of the gap.

[0061] The stator bracket 133 is also provided with an air outlet 139 that penetrates the base. The radial dimension of the air outlet 139 from the drive shaft 131 is greater than or equal to the radial dimension of the baffle 134 from the drive shaft 131, so that the cooling airflow will not touch the parts inside the second housing 132 during the downward flow, thus avoiding the loss of cooling airflow. This allows for greater utilization of the cooling airflow to cool the motor assembly 13.

[0062] The first housing 101 includes a connecting portion 103 extending outward from its outer peripheral wall and a first air inlet 104 communicating with the receiving cavity 102. The second housing 132 has a second air inlet 136 at one end away from the stator support 133 for the cooling airflow to enter. The outer wall of the second housing, the base, the baffle 134 and the inner wall of the first housing 101 together form an airflow path between the first air inlet and the second air inlet.

[0063] The cooling airflow enters the receiving cavity 102 through the first air inlet 104, forming an airflow channel between the second housing 132 and the first housing 101. This airflow channel is defined by the outer wall of the second housing 132, the baffle 134, and the inner wall of the first housing 101. Under the action of the first fan 14, the cooling airflow flows to the top of the second housing 132 and flows from the second air inlet 136 located at the top of the second housing 132 into the interior of the motor assembly 13. After passing through the motor assembly 13, the cooling airflow exits from the air outlet side 138 at the bottom of the stator bracket 133.

[0064] The second fan 15 is located between the motor assembly 13 and the actuation assembly 11, and the second fan 15 is at least partially located outside the first housing 101. The second fan 15 and the actuation assembly 11 rotate together with the drive shaft 131, and there is no direct connection between the second fan 15 and the drive shaft 131. The second fan 15 is press-fitted between the first housing 101 and the actuation assembly 11.

[0065] The power tool 100 includes a handle assembly 30 disposed opposite to the working component 10 and a connecting assembly 20 for connecting the working component and the handle assembly. One end of the connecting assembly 20 is connected to the working component 10, and the other end of the connecting assembly is connected to the handle assembly 30. A hollow channel is formed inside the connecting assembly 20. Several through holes communicating with the receiving cavity are provided on the lower part of the connecting assembly 20 near the working component 10. The through holes also communicate with the first air inlet 104 and the hollow channel. The number of through holes is not limited here. The through holes are opened below the connecting assembly 20 and are at a certain distance from the working component 10 to prevent grass clippings and other debris from entering the working component 10 through the through holes during the operation of the lawnmower 100, thereby affecting the normal operation of the working component 10.

[0066] When the power tool 100 is working, the first fan 14 rotates together with the drive shaft 131 to generate negative pressure. At this time, the cooling airflow enters the hollow channel through several through holes on the connecting component and enters the receiving cavity 102 through the first air inlet 104. Under the action of the first fan 14, the cooling airflow is drawn to the top of the second housing 132 and enters the interior of the motor assembly 13 through the second air inlet 136 located at the top of the second housing 132 to cool the motor assembly 13. Subsequently, under the action of the baffle 134 of the stator bracket 133, most of the cooling airflow flows out from the air outlet side 138 of the stator bracket 133. Under the action of the air guide 151 of the second fan 15, the cooling airflow after flowing through the motor assembly 13 is guided to the negative pressure area of ​​the second fan 15. Then, under the action of the centrifugal fan blades 154, the cooling airflow is discharged from the first housing 101, thereby improving the heat dissipation efficiency of the motor assembly 13.

[0067] This utility model addresses the wiring harness fixing method of existing power tool motors. While ensuring simple manufacturing and assembly, it achieves a compact layout, lightweight appearance, and overall weight reduction, thereby reducing the number of parts, saving space, and lowering production costs.

[0068] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions exist for the power tools described in this application without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. An electric tool, comprising a working component and a power supply component, the working component comprising a first housing, a receiving cavity enclosed by the first housing, and a motor assembly received within the receiving cavity, the motor assembly comprising a drive shaft extending axially, a second housing sleeved on the drive shaft, and a stator bracket connected to the first housing, the motor assembly being electrically connected to the power supply component via a cable; characterized in that: The stator support includes an air outlet connecting the inner and outer sides of the second housing and a cable groove communicating with the air outlet. The cable passes through the air outlet and the cable groove to connect to the power supply component.

2. The power tool according to claim 1, characterized in that: The stator support includes a base fixed to the first housing, the air outlet passes through the base axially, and the wire groove passes through the base radially perpendicular to the axial direction.

3. The power tool according to claim 2, characterized in that: The base includes a radially extending pressure line portion, and the first housing includes a rib extending radially from its inner sidewall toward the drive shaft, the pressure line portion and the rib being axially spaced apart to form the groove.

4. The power tool according to claim 3, characterized in that: The pressure line portion is located radially outside the air outlet and protrudes axially upward from the plane of the base to form the groove with the rib.

5. The power tool according to claim 2, characterized in that: The air outlet and the wire groove together form part of the wiring channel, which includes a first channel located near the bottom of the motor assembly and arranged radially, a second channel formed by the air outlet, and a third channel formed by the wire groove.

6. The power tool according to claim 5, characterized in that: The stator support includes a baffle extending axially from the base into the second housing, the first channel being located radially within the baffle, the second channel being perpendicular to the first channel, and the third channel being parallel to the first channel.

7. The power tool according to claim 6, characterized in that: The baffle and the base surround to form the air outlet, and the groove is located axially between the upper and lower ends of the air outlet.

8. The power tool according to claim 2, characterized in that: The base includes a fixing part for fixing the stator bracket to the bottom of the first housing. The fixing part includes several through holes, and a connecting plate is formed between two of the through holes. The wire groove is located on the connecting plate.

9. The power tool according to claim 1, characterized in that: The first housing includes a connecting portion extending outward from its outer peripheral wall and a first air inlet communicating with the receiving cavity, and the wire groove is disposed near the first air inlet.

10. The power tool according to claim 9, characterized in that: The power tool includes a handle assembly, a connecting assembly connecting the handle assembly and the working assembly, and a power supply assembly connected to the handle assembly. The connecting assembly is connected to the connecting part, and the cable passes sequentially through the air outlet, the cable groove, the first air inlet, and the connecting assembly to electrically connect the motor assembly and the power supply assembly.

Images