Power tool

Abstract

This application relates to a power tool, including a housing assembly, a motor, an output device, and a transmission assembly. The motor includes a motor shaft and a stator mounted on the motor shaft. The output device is connected to a working component to perform the power tool's working function. The transmission assembly connects the motor and the output device. The power tool also includes a housing and a motor bracket. The housing houses the transmission assembly and the motor; the housing is located within the housing assembly and has an opening. The motor bracket is connected to the motor shaft to support the motor, and passes through the opening to be fixedly connected to the housing assembly. This application uses a modular structure with the motor and gearbox to reduce the number of parts, thereby reducing vibration during power tool operation.

Description

Technical Field

[0001] This application relates to the field of electric actuators, and more specifically, to power tools. Background Technology

[0002] In most power tools currently on the market, the motor is connected to the output device via a transmission assembly to provide driving force. The housing of the transmission assembly and the motor housing are often fixed to the main machine housing with screws. This involves a large number of parts, and during operation, some of the motor's vibration is directly transmitted to the main machine housing, while another part is transmitted through the motor shaft to the transmission assembly, then through the transmission assembly's housing, and finally to the main machine housing. This significant vibration can easily cause user fatigue and negatively impact the user experience. Utility Model Content

[0003] This application provides power tools to address the problem of how to reduce the vibration of power tools, thereby alleviating user fatigue.

[0004] Embodiments of this application provide a power tool, including a housing assembly, a motor, an output device, and a transmission assembly. The motor includes a motor shaft and a stator mounted on the motor shaft. The output device is connected to a working component to perform the power tool's working functions. The transmission assembly is connected between the motor and the output device. The power tool also includes a housing and a motor bracket. The housing is used to house the transmission assembly and the motor, and is located within the housing assembly and has an opening. The motor bracket is connected to the motor shaft to support the motor, and passes through the opening to be fixedly connected to the housing assembly.

[0005] The aforementioned power tool, by using a housing to separately house the transmission component and the motor, creates a modular structure for both. This reduces the number of parts and avoids the accumulation of errors caused by multiple component connections when the transmission component and motor are installed separately, thereby reducing vibration during operation. By fixing the motor bracket to the housing assembly, the vibration generated during motor operation is transmitted to the housing assembly through the bracket. Since there is no direct connection between the motor bracket and the housing, most of the vibration generated by the motor and the transmission component is independently transmitted to the housing assembly. This disperses and attenuates the vibrations at different locations within the housing assembly, reducing the energy superposition between the two. Therefore, the overall vibration generated during power tool operation is lower, reducing user fatigue.

[0006] In one embodiment, the motor bracket includes a cylindrical portion and a connecting portion connected to the cylindrical portion. The cylindrical portion is sleeved around the motor shaft to support the motor, and a stator is sleeved around a portion of the cylindrical portion. The connecting portion passes through an opening radially along the motor shaft to connect to a housing assembly.

[0007] In one embodiment, the housing assembly has a cavity for accommodating a receiving box, and the connecting groove communicates with the cavity. A connecting portion is inserted into the connecting groove at one end radially away from the cylinder along the motor shaft.

[0008] In one embodiment, at least two connecting slots are provided, each located on opposite sides of the housing assembly along the radial direction of the motor shaft. At least two openings are provided, each corresponding to one of the connecting slots and arranged radially opposite to the connecting slots along the motor shaft. At least two connecting portions are provided, each corresponding to one of the connecting slots and inserted into the corresponding connecting slot through the corresponding opening.

[0009] In one embodiment, the housing assembly includes an upper housing and a lower housing, with the upper housing covering the lower housing to form a cavity. One connecting groove is disposed in the upper housing, and the other connecting groove is disposed in the lower housing.

[0010] In one embodiment, the housing includes a first receiving cavity and a second receiving cavity, which are arranged axially along the motor shaft and communicate with each other. At least a portion of the motor is disposed in the first receiving cavity. At least a portion of the transmission assembly is disposed in the second receiving cavity. One end of the motor shaft extends into the second receiving cavity and is connected to the transmission assembly. An opening communicates with the first receiving cavity.

[0011] In one embodiment, the opening is located at one end of the first receiving cavity along the axial direction of the motor shaft, close to the second receiving cavity.

[0012] In one embodiment, the housing includes a base and a cover connected to the base, the base and cover forming a first receiving cavity, wherein the length of the base is greater than the length of the cover in the axial direction of the motor shaft. The housing assembly includes ribs extending from its inner sidewall, the ribs being disposed corresponding to the portion of the base extending beyond the cover and forming a second receiving cavity with the base.

[0013] In one embodiment, the motor further includes a cooling fan sleeved around the motor shaft. Along the axial direction of the motor shaft, a motor bracket is located between the cooling fan and the transmission assembly. An opening is located outside the stator at the end of the stator along the axial direction of the motor shaft away from the cooling fan.

[0014] In one embodiment, the working assembly includes a guide plate and a chain wound around the guide plate, with a motor driving the chain to cut the target part. The power tool also includes a connecting rod with an output device located at one end of the connecting rod. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of a power tool provided in one embodiment of this application.

[0017] Figure 2 for Figure 1 A partial structural schematic diagram of the power tool in the illustrated embodiment.

[0018] Figure 3 for Figure 1 An exploded view of a portion of the structure of the power tool in the illustrated embodiment.

[0019] Figure 4 for Figure 1 An exploded view of a portion of the structure of the power tool in the illustrated embodiment.

[0020] Figure 5 for Figure 1 A partial cross-sectional view of the power tool in the illustrated embodiment.

[0021] Figure 6 for Figure 1 A schematic diagram of the assembly state of the motor and housing in the illustrated embodiment.

[0022] Figure 7 for Figure 1 A schematic diagram of the assembly state of the motor and housing in the illustrated embodiment from another perspective.

[0023] Figure 8 for Figure 1 A schematic diagram of the assembly state of the motor bracket and the motor in the illustrated embodiment.

[0024] Figure 9 for Figure 1 A partial three-dimensional view of the housing assembly in the illustrated embodiment.

[0025] Figure 10 for Figure 1 A partial three-dimensional view of the housing assembly in the illustrated embodiment.

[0026] Figure 11 for Figure 1 A perspective view of the container in the illustrated embodiment.

[0027] Figure 12 for Figure 1 A perspective view of the base in the illustrated embodiment.

[0028] Explanation of key component symbols:

[0029] Power tools 100

[0030] Motor 10

[0031] Motor shaft 11

[0032] Stator 12

[0033] Cooling fan 13

[0034] Output device 20

[0035] Output shaft 21

[0036] Sprocket 22

[0037] Transmission assembly 30

[0038] Working Component 40

[0039] Guide plate 41

[0040] Chain 42

[0041] Connecting rod 50

[0042] Grip section 60

[0043] 70 container

[0044] Opening 70a

[0045] First receiving cavity 70b

[0046] First cavity 70b1

[0047] Second cavity 70b2

[0048] Third chamber 70b3

[0049] Second accommodating cavity 70c

[0050] Through hole 70e

[0051] Part 1, Chapter 71

[0052] Part 2, 72

[0053] Base 73

[0054] Second opening 73a

[0055] Cover 74

[0056] First opening 74a

[0057] Housing assembly 80

[0058] Cavity 80a

[0059] Connection slot 80b

[0060] Upper casing 81

[0061] Muscle position 811

[0062] Lower housing 82

[0063] Motor bracket 90

[0064] Cylinder 91

[0065] Connecting part 92

[0066] Bearing 110

[0067] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0068] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0069] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0071] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0072] Figure 1 This is a perspective view of a power tool 100 provided in one embodiment of this application; Figure 2 for Figure 1 A partial structural schematic diagram of the power tool 100 in the illustrated embodiment; Figure 3 for Figure 1 An exploded view of a portion of the structure of the power tool 100 in the illustrated embodiment.

[0073] See Figures 1 to 3 This embodiment provides a power tool 100, including a housing assembly 80, a motor 10, an output device 20, and a transmission assembly 30. The output device 20 is connected to a working component 40 to realize the working function of the power tool 100, and the transmission assembly 30 is connected between the motor 10 and the output device 20.

[0074] In use, the driving force output by the motor 10 is transmitted to the output device 20 via the transmission component 30, thereby driving the output device 20 to drive the working component 40 to realize the operation of the power tool 100. The power tool 100 can be an electric screwdriver, grinder, electric saw, etc. In this embodiment, an electric chainsaw is used as an example for explanation. The electric chainsaw can be a long-handled chainsaw, such as a peg saw.

[0075] In some embodiments, such as Figure 1 and Figure 2 As shown, the working component 40 includes a guide plate 41 and a chain 42 wound around the guide plate 41. A motor 10 drives the chain 42 to cut the target component (not shown). The power tool 100 also includes a connecting rod 50, with an output device 20 located at one end of the connecting rod 50. Thus, the chain 42 is guided by the guide plate 41, maintaining a stable position and trajectory during cutting, while the motor 10 provides power for the chain 42's cutting. The connecting rod 50 allows for remote or high-altitude operations, for example, for vegetation treatment in high-altitude, dangerous, or difficult-to-reach areas. In this embodiment, the target component can be a tree branch, canopy, vine, etc.

[0076] Figure 4 for Figure 1 An exploded view of a portion of the structure of the power tool 100 in the illustrated embodiment; Figure 5 for Figure 1 A partial cross-sectional view of the power tool 100 in the illustrated embodiment.

[0077] Optionally, such as Figure 4 and Figure 5 As shown, the motor 10 includes a motor shaft 11 and a stator 12 mounted on the motor shaft 11. The output device 20 includes an output shaft 21 and a sprocket 22. The transmission assembly 30 is connected between the motor shaft 11 and the output shaft 21. The sprocket 22 is fixed to the end of the output shaft 21 and is connected to the chain 42 (see...). Figure 2 The chain 42 is engaged to drive the chain 42 to circulate on the guide plate 41.

[0078] In some embodiments, such as Figure 1As shown, the power tool 100 also includes a grip 60, which is connected to the end of the connecting rod 50 away from the output device 20 and is used for the user to grip so that the user can send the working component 40 to a place far away from the user for operation.

[0079] Figure 6 for Figure 1 A schematic diagram of the assembly state of the motor 10 and the housing 70 in the illustrated embodiment.

[0080] See Figures 3 to 5 In this embodiment, the power tool 100 also includes a housing 70. Combined with... Figure 6 As shown, the housing 70 is located within the housing assembly 80 and is used to house the transmission assembly 30 and the motor 10.

[0081] The aforementioned power tool 100, by providing a housing 70 to house both the transmission assembly 30 and the motor 10, forms a modular structure for the motor 10 and the transmission assembly 30. This reduces the number of parts and avoids the accumulation of errors caused by the connection of multiple components when the transmission assembly 30 and the motor 10 are installed separately, thereby reducing the vibration of the power tool 100 during operation. Furthermore, since the housing 70 can be machined as a whole, it helps to improve the installation accuracy of the transmission assembly 30 and the motor 10 and reduce assembly errors. By installing the motor 10 inside the housing 70, most of the vibration of the motor 10 during operation is also transmitted to the housing 70, thereby reducing the vibration transmitted from the motor 10 to the transmission assembly 30. Therefore, the overall vibration generated by the power tool 100 during operation is smaller, reducing user fatigue, lowering noise, and extending the service life of the power tool 100.

[0082] In some embodiments, combined with Figures 4 to 6 As shown, the portion of the housing 70 that houses or covers the motor 10 and the portion that houses or covers the transmission assembly 30 form an integral structure. This integral structure of the housing 70 helps reduce assembly errors and noise caused by vibration at the assembly interface. It should be noted that "housing 70 for housing the motor 10" can mean that the housing 70 completely houses the motor 10, i.e., the entire motor 10 is located inside the housing 70, or it can mean that the housing 70 covers the motor 10, i.e., a portion of the motor 10 is located outside the housing 70. The transmission assembly 30 is similarly handled. In this embodiment, as... Figure 6 As shown, the housing 70 covers the motor 10 and the transmission assembly 30 respectively. In some other embodiments, the housing 70 may also completely accommodate the motor 10 and / or the transmission assembly 30 (not shown).

[0083] Figure 7 for Figure 1 A schematic diagram of the assembly state of the motor 10 and the housing 70 in the illustrated embodiment from another perspective.

[0084] In some embodiments, such as Figure 6 and Figure 7 As shown, the housing 70 has an opening 70a, and the power tool 100 also includes a motor bracket 90, combined with... Figure 5 As shown, the motor bracket 90 is connected to the motor shaft 11 to support the motor 10, and the motor bracket 90 passes through the opening 70a to be fixedly connected to the housing assembly 80. Thus, by fixing the motor bracket 90 to the housing assembly 80, the vibration generated during the operation of the motor 10 is transmitted to the housing assembly 80 through the motor bracket 90. Since there is no direct connection between the motor bracket 90 and the housing 70, most of the vibration generated by the motor 10 and the transmission assembly 30 are independently transmitted to the housing assembly 80, causing the vibrations of the motor 10 and the transmission assembly 30 to be dispersed and attenuated at different locations within the housing assembly 80, thereby reducing the energy superposition between the two. Furthermore, the spaced-apart motor bracket 90 and transmission assembly 30 are less prone to synchronous resonance, which also reduces the overall vibration of the power tool 100. Therefore, the vibration and noise of the power tool 100 can be further reduced, thereby further alleviating user fatigue.

[0085] Figure 8 for Figure 1 A schematic diagram of the assembly state of the motor bracket 90 and the motor 10 in the embodiment shown.

[0086] In some embodiments, such as Figure 5 and Figure 8 As shown, the motor bracket 90 includes a cylindrical portion 91 and a connecting portion 92 connected to the cylindrical portion 91. The cylindrical portion 91 is sleeved on the outside of the motor shaft 11 to support the motor 10, and the stator 12 is sleeved on a portion of the cylindrical portion 91. Figure 6 and Figure 7 As shown, the connecting portion 92 passes radially through the opening 70a along the motor shaft 11 to connect with the housing assembly 80. Thus, the cylindrical portion 91 provides support for the motor 10 and connects to the housing assembly 80 via the connecting portion 92. Since the connecting portion 92 passes radially through the opening 70a along the motor shaft 11, it is advantageous to reduce the volume of the connecting portion 92, thereby saving space. Optionally, the connecting portion 92 and the opening 70a are clearance-fitted. Figure 9 for Figure 1 A partial three-dimensional view of the housing assembly 80 in the illustrated embodiment; Figure 10 for Figure 1 A partial three-dimensional view of the housing assembly 80 in the illustrated embodiment.

[0087] In some embodiments, such as Figure 5 , Figure 9 and Figure 10As shown, the housing assembly 80 has a cavity 80a and a connecting groove 80b. The cavity 80a is used to accommodate the housing 70, and the connecting groove 80b communicates with the cavity 80a. The connecting part 92 is inserted into the connecting groove 80b at one end radially away from the cylindrical part 91 along the motor shaft 11. In this way, the connecting part 92 is connected to the connecting groove 80b on the housing to transmit part of the vibration generated by the motor 10 to the housing assembly 80. The plug-in connection method simplifies the structure and facilitates assembly. Optionally, the connecting part 92 is constructed in a cuboid shape to facilitate the machining of the connecting part 92 and the connecting groove 80b. In other embodiments, the connecting part 92 may also be constructed in other shapes, such as cylindrical or elliptical cylindrical.

[0088] In some embodiments, combined with Figure 5 , Figure 9 and Figure 10 As shown, at least two connecting slots 80b are provided, and the at least two connecting slots 80b are respectively provided on opposite sides of the housing assembly 80 along the radial direction of the motor shaft 11. Figure 6 and Figure 7 As shown, at least two openings 70a are provided, each corresponding to at least two connecting slots 80b, and arranged radially opposite to the connecting slots 80b along the motor shaft 11. At least two connecting portions 92 are provided, each corresponding to at least two connecting slots 80b, and inserted through the corresponding opening 70a into the corresponding connecting slot 80b. Thus, by providing at least two connecting slots 80b and connecting portions 92, the fixing reliability of the motor bracket 90 and the housing assembly 80 is improved, and the vibration generated by the motor 10 during operation can be transmitted to opposite sides of the housing, thereby transmitting the vibration of the motor 10 to different positions of the housing assembly 80, further facilitating vibration attenuation. In this embodiment, there are two connecting slots 80b, two openings 70a, and two connecting portions 92.

[0089] In some embodiments, such as Figure 9 and Figure 10 As shown, the housing assembly 80 includes an upper housing 81 and a lower housing 82, with the upper housing 81 covering the lower housing 82 to form a cavity 80a. One connecting groove 80b is located in the upper housing 81, and the other connecting groove 80b is located in the lower housing 82. Thus, during assembly, after the housing 70 and other components within the housing assembly 80 are inserted into the upper housing 81 or the lower housing 82, the lower housing 82 or the upper housing 81 is then closed, facilitating the manufacturing and assembly of the housing assembly 80. Furthermore, both the upper housing 81 and the lower housing 82 are connected to a connecting part 92, further improving the reliability of the connection between the connecting part 92 and the housing assembly 80.

[0090] In some embodiments, such as Figure 5As shown, the cylindrical portion 91 extends axially from the end of the stator 12 near the transmission assembly 30 along the motor shaft 11 and is connected to the connecting portion 92. In this way, the cylindrical portion 91 is positioned at the interval between the motor assembly 10 and the transmission assembly 30, making the arrangement within the housing assembly 80 more compact and helping to reduce the axial dimension of the housing assembly 80 along the motor shaft 11.

[0091] Figure 11 for Figure 1 A perspective view of the container 70 in the illustrated embodiment.

[0092] In some embodiments, such as Figure 11 As shown, the receiving box 70 includes a first receiving cavity 70b and a second receiving cavity 70c, combined with Figure 5 and Figure 6 As shown, the first receiving cavity 70b and the second receiving cavity 70c are arranged axially along the motor shaft 11 and communicate with each other. At least a portion of the motor 10 is disposed in the first receiving cavity 70b, and at least a portion of the transmission assembly 30 is disposed in the second receiving cavity 70c. One end of the motor shaft 11 extends into the second receiving cavity 70c and is connected to the transmission assembly 30, and the opening 70a communicates with the first receiving cavity 70b. This facilitates the adaptation of the first receiving cavity 70b and the second receiving cavity 70c to the motor 10 and the transmission assembly 30, respectively, thereby reducing vibrations caused by loosening during operation of the motor 10 and the transmission assembly 30, and also helps to reduce the volume of the receiving box 70. It should be noted that the adaptation of the first receiving cavity 70b to the motor 10 means that the shape of the first receiving cavity 70b matches the shape of the motor 10, and the size of the first receiving cavity 70b matches the size of the motor 10. The adaptation of the second receiving cavity 70c to the transmission assembly 30 is similar.

[0093] Optionally, such as Figure 5 As shown, the housing 70 has a through hole 70e, which connects the first housing cavity 70b and the second housing cavity 70c. The end of the motor shaft 11 near the transmission assembly 30 passes through the through hole 70e. It should be noted that since only the through hole 70e needs to be machined on the housing 70, instead of machining holes for the motor shaft 11 to pass through on separate structures and ensuring coaxiality through assembly, eccentric vibration caused by installation errors is avoided, thereby further reducing noise.

[0094] In some embodiments, such as Figure 6 and Figure 11 As shown, opening 70a is located in the first receiving cavity 70b along the motor shaft 11 (see...). Figure 5 The axial direction of the connection 92 is close to one end of the second receiving cavity 70c. In this way, the connection 92 is located between the interval between the motor 10 and the transmission assembly 30, thereby making the structural arrangement inside the receiving box 70 more compact and helping to reduce the axial dimension of the receiving box 70 along the motor shaft 11.

[0095] In some embodiments, such as Figure 6 and Figure 11 As shown, the receiving box 70 includes a first portion 71 and a second portion 72, the first portion 71 defining a first receiving cavity 70b, and the second portion 72 defining a second receiving cavity 70c. Figure 12 As shown, at least a portion of the first part 71 and at least a portion of the second part 72 are integrally formed, so there is no assembly interface or interface between the integrally formed first part 71 and the second part 72. This avoids noise caused by vibration collision or friction at the interface gap. Furthermore, the transmission path of vibration energy in the integrally formed structure is shorter, and due to the good structural continuity, the energy decays faster, thus further reducing vibration and noise.

[0096] In some embodiments, the power tool 100 further includes a first fastener (not shown) that passes through the first portion 71 and the housing assembly 80 to secure the first portion 71 relative to the housing assembly 80.

[0097] In some embodiments, the power tool 100 further includes a second fastener (not shown) that passes through the second portion 72 and the housing assembly 80 to secure the second portion 72 relative to the housing assembly 80.

[0098] Figure 12 for Figure 1 A perspective view of the base 73 in the illustrated embodiment.

[0099] In some embodiments, such as Figure 11 and Figure 12 As shown, the receiving box 70 includes a base 73 and a cover 74 connected to the base 73. The base 73 and the cover 74 form a first receiving cavity 70b. In the axial direction of the motor shaft 11, the length of the base 73 is greater than the length of the cover 74. Figure 9 As shown, the housing assembly 80 includes a rib 811 extending from its inner wall. The rib 811 is provided corresponding to the portion of the base 73 that extends beyond the cover 74 and forms a second receiving cavity 70c with the base 73. This opens the portion of the base 73 corresponding to the rib 811, facilitating access to the transmission assembly 30 (see...). Figure 5 This allows for maintenance, such as facilitating observation of wear on the transmission component 30, cleaning internal debris, or adding lubricating oil. It also simplifies the structure of the housing 70 and makes the connection between the base 73 and the rib 811 cleaner, facilitating quick positioning during assembly. Alternatively, such as... Figure 6 As shown, the rib 811 is provided on the upper shell 81.

[0100] In some embodiments, combined with Figure 5 and Figure 12As shown, the base 73 is integrally formed, so that the two parts of the base 73 that respectively accommodate the transmission component 30 and the motor 10 are continuous structures, and there is no direct connection between the cover 74 and the part of the base 73 that accommodates the transmission component 30, thus eliminating the assembly interface and further reducing vibration and noise.

[0101] In some embodiments, such as Figure 11 As shown, the cover 74 has a first opening 74a, which communicates with the first receiving cavity 70b to improve the motor 10 (see Figure 6 The heat dissipation effect. Optionally, the first opening 74a forms an opening 70a at one end along the axial direction of the motor shaft 11 near the second receiving cavity 70c, such as... Figure 7 As shown, the base 73 has another opening 70a, and the two connecting parts 92 of the motor bracket 90 pass through the two openings 70a respectively to connect the housing assembly 80.

[0102] In some embodiments, such as Figure 6 As shown, the portion of the base 73 outside the cover 74 has a second opening 73a, which communicates with the second receiving cavity 70c. The power tool 100 also includes an output shaft 21, which passes through the second opening 73a. Figure 5 As shown, the portion of the output shaft 21 that extends into the second receiving cavity 70c is connected to the transmission assembly 30, and the portion of the output shaft 21 that extends out of the second receiving cavity 70c is connected to the output device 20.

[0103] In some embodiments, such as Figure 5 As shown, the first receiving cavity 70b includes a first cavity 70b1 and two second cavities 70b2, which are respectively connected to both ends of the first cavity 70b1 along the axial direction of the motor shaft 11. The stator 12 is disposed in the first cavity 70b1. The power tool 100 also includes two bearings 110, which are respectively disposed in the two second cavities 70b2 and between the motor shaft 11 and the receiving housing 70. Thus, the two ends of the motor shaft 11 are rotatably supported within the receiving housing 70 by the two bearings 110. The motor bracket 90 is disposed in the first cavity 70b1.

[0104] In some embodiments, such as Figure 5As shown, the first receiving cavity 70b further includes a third cavity 70b3, which connects the end of the first cavity 70b1 away from the second receiving cavity 70c and the second cavity 70b2. The motor 10 also includes a cooling fan 13, which is sleeved on the outside of the motor shaft 11 and located in the third cavity 70b3. This positions the cooling fan 13 at the end of the motor 10 away from the transmission assembly 30, preventing the rotation of the transmission assembly 30 from affecting the cooling efficiency of the cooling fan 13 and preventing the heat generated by the transmission assembly 30 from affecting the air temperature drawn in by the cooling fan 13. Therefore, the cooling capacity of the cooling fan 13 can be improved, and the disassembly of the cooling fan 13 is convenient. Optionally, combined with... Figure 11 As shown, the first opening 74a is connected to the first cavity 70b1 and the third cavity 70b3 at both ends along the axial direction of the motor shaft 11, respectively, in order to further improve the heat dissipation efficiency of the motor 10.

[0105] In some embodiments, such as Figure 5 As shown, along the axial direction of the motor shaft 11, the motor bracket 90 is located between the cooling fan 13 and the transmission assembly 30, in combination. Figure 6 and Figure 7 As shown, the opening 70a is located outside the end of the stator 12 along the axial direction of the motor shaft 11 away from the cooling fan 13. In this way, the motor bracket 90 is prevented from blocking the space between the cooling fan 13 and the stator 12, and the distance between the cooling fan 13 and the stator 12 is shortened, thereby improving the heat dissipation effect of the cooling fan 13.

[0106] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. An electric tool, comprising: Housing assembly; An electric motor, including a motor shaft and a stator mounted on the motor shaft; An output device is connected to a working component to enable the working function of the power tool; A transmission assembly is connected between the motor and the output device; The power tool is characterized in that it further includes: A housing for accommodating the transmission assembly and the motor, the housing being located within the housing assembly and having an opening; A motor bracket, connected to the motor shaft to support the motor, passes through the opening to be fixedly connected to the housing assembly.

2. The power tool according to claim 1, characterized in that: The motor bracket includes a cylindrical portion and a connecting portion connected to the cylindrical portion; The cylindrical portion is sleeved around the motor shaft to support the motor, and the stator is sleeved around a portion of the cylindrical portion; The connecting portion passes through the opening radially along the motor shaft to connect with the housing assembly.

3. The power tool according to claim 2, characterized in that: The housing assembly has a cavity and a connecting groove, the cavity being used to accommodate the housing box, and the connecting groove communicating with the cavity; The connecting part is inserted into the connecting groove at one end of the motor shaft that is radially away from the cylinder.

4. The power tool according to claim 3, characterized in that: The connecting groove is provided in at least two parts, and the at least two connecting grooves are respectively provided on opposite sides of the housing assembly along the radial direction of the motor shaft; The opening is configured to be at least two, and the at least two openings correspond to the at least two connecting slots respectively, and are arranged radially opposite to the connecting slots along the motor shaft; The connecting part is provided in at least two parts, and the at least two connecting parts correspond to at least two connecting slots respectively, and are inserted into the corresponding connecting slots through the corresponding openings.

5. The power tool according to claim 4, characterized in that: The housing assembly includes an upper housing and a lower housing, with the upper housing covering the lower housing to form the cavity; One of the connecting slots is located in the upper housing, and the other connecting slot is located in the lower housing.

6. The power tool according to claim 1, characterized in that: The housing includes a first receiving cavity and a second receiving cavity, which are arranged along the axial direction of the motor shaft and communicate with each other. At least a portion of the motor is disposed in the first receiving cavity; At least a portion of the transmission assembly is disposed in the second receiving cavity; One end of the motor shaft extends into the second receiving cavity and is connected to the transmission assembly; The opening is connected to the first receiving cavity.

7. The power tool according to claim 6, characterized in that: The opening is located at one end of the first receiving cavity along the axial direction of the motor shaft, close to the second receiving cavity.

8. The power tool according to claim 6, characterized in that: The receiving box includes a base and a cover connected to the base. The base and the cover form the first receiving cavity. In the axial direction of the motor shaft, the length of the base is greater than the length of the cover. The housing assembly includes ribs extending from its inner sidewall, the ribs being disposed corresponding to the portion of the base extending beyond the cover and forming a second receiving cavity with the base.

9. The power tool according to claim 1, characterized in that: The motor also includes a cooling fan, which is sleeved outside the motor shaft; Along the axial direction of the motor shaft, the motor bracket is located between the cooling fan and the transmission assembly; The opening is located outside the stator at the end away from the cooling fan along the axial direction of the motor shaft.

10. The power tool according to claim 1, characterized in that: The working component includes a guide plate and a chain wound on the guide plate, and the motor is used to drive the chain to cut the target part; The power tool also includes a connecting rod, and the output device is located at one end of the connecting rod.

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