Power tool and electric hammer

Abstract

The application discloses an electric tool and an electric hammer. The electric tool comprises a housing assembly, a working head exposed at least partially from the housing assembly, a motor for driving the working head, the motor extending in an up-down direction, an air inlet, an air outlet and a joint provided on the housing assembly, the joint being used for coupling an external device to allow air flow from the external device to enter the air inlet, and the air flow entering the air inlet flowing through the motor at least partially and then being discharged from the air outlet. The electric tool of the application can share a fan, save energy and increase endurance by making the flow path of the air flow blown by the external device consistent with at least part of the heat dissipation path.

Description

Technical Field

[0001] This application relates to the field of electric device technology, specifically to an electric tool and an electric hammer. Background Technology

[0002] A hammer drill is a power tool that converts the rotational motion of a motor into the linear reciprocating motion of a working head, removing the workpiece through hammering. During operation, a hammer drill generates a significant amount of dust; furthermore, the gearbox, motor, and PCB all produce considerable heat. Heat dissipation issues can shorten the machine's lifespan and negatively impact the user experience—overheating can render the machine unusable. Using a hammer drill in conjunction with a vacuum cleaner can alleviate these problems.

[0003] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0004] One objective of this application is to solve or at least alleviate some or all of the aforementioned problems. To this end, one objective of this application is to provide a power tool with an optimized dust collection and heat dissipation airflow design, thereby improving dust collection and heat dissipation efficiency. To achieve the above objective, this application adopts the following technical solution: An electric tool includes: a housing assembly; a working head, at least partially exposed in the housing assembly; a motor for driving the working head, the motor extending in a vertical direction; the housing assembly is provided with an air inlet, an air outlet and a coupling portion for coupling an external device to allow airflow from the external device into the air inlet; the airflow entering from the air inlet flows at least through the motor and then exits from the air outlet.

[0005] In some embodiments, the motor includes a fan, and at least a portion of the airflow is discharged after the fan changes its direction.

[0006] In some embodiments, the air outlet is positioned near the edge of the fan blades.

[0007] In some embodiments, a second air outlet is also provided on the housing assembly, and the second air outlet is located on the top of the housing assembly.

[0008] In some embodiments, the power tool also includes a transmission mechanism for transmitting torque between the motor and the working head, and includes a gearbox extending in a front-rear direction. The power tool also includes a shroud configured to allow a portion of the airflow to pass through the gearbox and exit from a second vent.

[0009] In some embodiments, the housing assembly further includes a second air inlet disposed on the top of the housing assembly.

[0010] In some embodiments, the power tool further includes a transmission mechanism for transmitting torque between the motor and the working head, and includes a gearbox extending in a front-rear direction; airflow entering from the second air inlet flows through the gearbox and exits from the air outlet.

[0011] In some embodiments, the power tool further includes a transmission mechanism for transmitting torque between the motor and the working head, and includes a gearbox extending in a front-rear direction; the fan includes a first set of fan blades and a second set of fan blades, wherein airflow flowing into the air inlet forms a first air path under the action of the first set of fan blades and cools the motor; and airflow flowing into the second air inlet forms a second air path under the action of the second set of fan blades and cools the gearbox.

[0012] In some embodiments, the air inlet is oriented in the same direction as the working head and is located below the motor in the vertical direction.

[0013] In some embodiments, the power tool is an electric hammer.

[0014] An electric tool includes: a housing assembly; a working head, at least partially exposed in the housing assembly; a motor for driving the working head, the motor shaft extending in a vertical direction; the housing assembly is provided with an air inlet, an air outlet and a coupling portion for coupling an external device to allow airflow from the external device into the air inlet; the housing assembly contains only one set of fan blades.

[0015] In some embodiments, a second air outlet is also provided on the housing assembly, and the second air outlet is located on the top of the housing assembly.

[0016] In some embodiments, the power tool further includes a drive mechanism for transmitting torque between a motor and a working head, and includes a gearbox extending in a front-rear direction; the power tool also includes a shroud configured to allow a portion of the airflow to pass through the gearbox for discharge from a second outlet.

[0017] In some embodiments, a second air inlet is also provided on the housing assembly, and the second air inlet is located on the top of the housing assembly.

[0018] In some embodiments, the air inlet is located below the motor.

[0019] In some embodiments, the power tool further includes a transmission mechanism for transmitting torque between the motor and the working head, and includes a gearbox extending in a front-to-back direction; an air inlet is located below the gearbox and above the motor.

[0020] In some embodiments, the air inlet is positioned opposite the gearbox.

[0021] In some embodiments, the air outlet is positioned near the edge of the fan blade.

[0022] In some embodiments, the air inlet is oriented in the same direction as the working head and is located below the motor in the vertical direction.

[0023] In some embodiments, the power tool is an electric hammer.

[0024] An electric tool includes: a housing assembly; a working head, at least partially exposed in the housing assembly; a motor, housed in the housing assembly, for driving the working head, the motor including a fan; a transmission mechanism, housed in the housing assembly and coupled to the motor and the working head respectively, for transmitting torque between the motor and the working head, the transmission mechanism including a gearbox extending in a front-rear direction; the housing assembly includes an air inlet and a second air inlet, the fan including a first set of fan blades and a second set of fan blades, airflow entering through the air inlet forming a first air path driven by the first set of fan blades to cool the motor; airflow entering through the second air inlet forming a second air path driven by the second set of fan blades to cool the gearbox.

[0025] In some embodiments, the housing assembly includes an air outlet, from which both a first air passage and a second air passage discharge.

[0026] In some embodiments, the air inlet is used to connect to an external device, and the second air inlet is a normal opening.

[0027] In some embodiments, the air inlet is located below the motor.

[0028] In some embodiments, the second air inlet is located above the gearbox.

[0029] In some embodiments, the first set of fan blades and the second set of fan blades are arranged back to back.

[0030] In some embodiments, the power tool also includes a switch that can selectively block or expose the air inlet.

[0031] In some embodiments, the power tool also includes a coupling for coupling an external device. When the external device is coupled to the coupling, the coupling causes the switch to rotate, exposing the air inlet.

[0032] In some embodiments, the joint includes a movable element, and the opener / closer is linked to the movable element. When an external device is coupled to the joint, the movable element is displaced, causing the opener / closer to rotate and expose the air inlet.

[0033] In some embodiments, the joint further includes a slot, into which at least part of the movable member can extend, and which can be moved by pressing the movable member when an external device is inserted into the slot.

[0034] The airflow path of the power tool in this application is optimized, in particular, so that the airflow path of the external device (vacuum cleaner) is consistent with at least part of the heat dissipation path, so that the fan can be shared, saving energy, increasing battery life, and reducing weight. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the first type of electric hammer provided in the embodiments of this application; Figure 2 yes Figure 1 Top view of the structure; Figure 3 yes Figure 2 AA section view in the middle; Figure 4 This is a schematic diagram of the structure of the second type of electric hammer provided in the embodiments of this application; Figure 5 yes Figure 4 A sectional view of the middle structure; Figure 6 This is a schematic diagram of the third type of electric hammer and external equipment provided in the embodiments of this application; Figure 7 This is a schematic diagram of the internal structure of the external device being attached to the joint as provided in the embodiments of this application; Figure 8 This is a schematic diagram of the internal structure of the external device and the connecting part after they are fully connected according to the embodiments of this application; Figure 9 This is a schematic diagram of the internal airflow of the first type of electric hammer provided in the embodiments of this application; Figure 10 This is a schematic diagram of the internal airflow of the second type of electric hammer provided in the embodiments of this application; Figure 11 This is a schematic diagram of the internal airflow of the third type of electric hammer provided in the embodiments of this application; Figure 12 This is a schematic diagram of the internal airflow of the fourth type of electric hammer provided in the embodiments of this application; Figure 13 This is a schematic diagram of the internal airflow of the fifth type of electric hammer provided in the embodiments of this application.

[0036] In the picture: 10. Housing assembly; 11. Main housing; 111. Air inlet; 112. Air outlet; 113. Guide groove; 114. Second air outlet; 115. Second air inlet; 116. Annular rib; 12. First handle mounting part; 121. Upper mounting point; 122. Lower mounting point; 13a. Second handle mounting part; 13b. Second housing; 131. Annular groove; 14. Connecting rod; 15. Spring; 16. Joint; 161. Moving part; 1611. First transmission part; 1612. Mating inclined surface; 162. Groove; 17. Opener / closer; 171. Baffle part; 172. Second transmission part; 18. Elastic element; 20. Working head; 30. Motor; 31. Motor body; 32. Motor shaft; 33. Fan; 331. First set of fan blades; 332. Second set of fan blades; 333. Baffle; 334. Fan blades; 40. Transmission mechanism; 41. Gearbox; 42. Gear set; 43. Eccentric component; 44. Reciprocating motion component; 45. Sleeve; 51. First handle; 511. Power interface; 52. Second handle; 521. Handle body; 522. Handle glove; 61. First damping element; 62. Second damping element; 70. Battery pack; 80. Fairing; 90. External devices. Detailed Implementation

[0037] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0038] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0039] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0040] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0041] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0042] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0043] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0044] This embodiment provides a power tool, which can be an electric hammer. The following description uses an electric hammer as an example.

[0045] like Figures 1-3 As shown, the power tool includes a housing assembly 10, a working head 20, a motor 30, and a transmission mechanism 40. The housing assembly 10 includes a main housing 11. The working head 20 is at least partially exposed outside the housing assembly 10. The portion of the working head 20 exposed outside the housing assembly 10 can be connected to attachments for operation or can directly contact the work medium. The motor 30 is housed in the housing assembly 10 and drives the working head 20. The transmission mechanism 40 is at least partially housed in the main housing 11 and coupled to both the motor 30 and the working head 20. The transmission mechanism 40 transmits torque between the motor 30 and the working head 20.

[0046] like Figure 2 and Figure 3 As shown, the transmission mechanism 40 includes an eccentric component 43, a reciprocating motion component 44, and a sleeve 45. One end of the eccentric component 43 is connected to the motor 30, and the other end is connected to the reciprocating motion component 44. The sleeve 45 extends generally in the front-rear direction, and the reciprocating motion component 44 can reciprocate within the sleeve 45. One end of the working head 20 is connected to the reciprocating motion component, and the other end extends outside the housing assembly 10. The motor 30 can drive the eccentric component 43 to rotate, which in turn drives the reciprocating motion component 44 to perform linear reciprocating motion, thereby driving the working head 20 to reciprocate linearly.

[0047] In this embodiment, the transmission mechanism 40 further includes a gear set 42, wherein the input end of the gear set 42 is driven by the output shaft of the motor 30, and the output end of the gear set 42 is connected to the eccentric component 43. By setting the gear set 42, the rotational speed output by the motor 30 can be reduced, thereby ensuring that the reciprocating motion component 44 reciprocates at an appropriate frequency. It is understood that the number and arrangement of gears in the gear set 42 can be flexibly set as needed, and no specific limitation is made here.

[0048] like Figure 3 As shown, the transmission mechanism 40 also includes a gearbox 41, which is arranged along the front-to-back direction. In this embodiment, the eccentric component 43, the reciprocating component 44, the sleeve 45, and the gear set 42 are all disposed inside the gearbox 41, thereby supporting and protecting the various components of the transmission mechanism 40. That is to say, the gearbox 41 in this embodiment is not a housing that only covers the gears in a narrow sense, but is used to cover the various transmission components in the transmission mechanism 40.

[0049] In this embodiment, the motor 30 is arranged vertically, and the transmission mechanism 40 is arranged horizontally. For example... Figure 3 As shown, the main housing 11 is roughly in the shape of a "7" and includes a vertical part and a horizontal part, wherein the motor 30 is disposed in the vertical part and the gearbox 41 extends in the front-rear direction and is at least partially disposed in the horizontal part.

[0050] like Figures 1-3 As shown, the power tool also includes a first handle 51, and the housing assembly 10 also includes a first handle mounting portion 12. The first handle 51 is mounted on the first handle mounting portion 12 for one-hand grip by the operator.

[0051] In some embodiments, the first handle mounting portion 12 is located at the rear of the main housing 11. For example... Figure 3As shown, the first handle mounting part 12 is connected to the main body shell 11 and includes an upper mounting point 121 and a lower mounting point 122. The upper end of the first handle 51 is mounted to the upper mounting point 121, and the lower end of the first handle 51 is mounted to the lower mounting point 122. With this configuration, the first handle 51 and the main body shell 11 form a closed ring, which not only makes it easier for the user to hold but also reduces the risk of accidental drop during holding.

[0052] In some embodiments, the first handle mounting portion 12 is integrally formed with the main housing 11, thereby reducing the number of parts in the housing assembly 10, which helps to ensure the overall structural strength of the housing assembly 10 and also improves the assembly efficiency of the power tool. In some embodiments, the first handle mounting portion 12 may also be configured as a component that can be detached from the main housing 11, which is not specifically limited here.

[0053] like Figure 3 As shown, the upper end of the first handle 51 is connected to the upper mounting point 121 via a connecting rod 14 and a spring 15. Specifically, both ends of the connecting rod 14 are connected to the first handle mounting part 12 and the first handle 51, respectively, and at least one end of the connecting rod 14 can slide relative to the part it is connected to. Both ends of the spring 15 are connected to the first handle mounting part 12 and the first handle 51, respectively. The connecting rod 14 supports tension, and the spring 15 supports pressure. When the power tool is working, the operator presses the first handle 51, and the force is transmitted between the main housing 11 and the first handle 51 through the spring 15, which plays a role in vibration damping. When the power tool is unloaded, the spring 15 presses the first handle 51 and the main housing 11 against both ends of the connecting rod 14. At this time, the vibration transmission of the first handle 51 is obvious. Therefore, the vibration when unloaded can be effectively reduced by adding elastic elements (not shown in the figure) at the contact surfaces of the first handle 51 and the connecting rod 14, and at the contact surfaces of the main housing 11 and the connecting rod 14, respectively.

[0054] When the upper end of the first handle 51 moves relative to the upper mounting point 121, to prevent excessive force and damage between the lower mounting point 122 and the first handle 51, such as... Figure 3 As shown, the lower end of the first handle 51 is pivotally connected to the lower mounting point 122. In some embodiments, the contact portion between the first handle 51 and the lower mounting point 122 is made of a soft material, thereby providing shock absorption for the first handle 51.

[0055] like Figure 3As shown, the power tool also includes a power interface 511, which is disposed on the first handle 51. In some embodiments, the power interface 511 is a battery pack interface for connecting to the battery pack 70. In some embodiments, the power interface 511 is a structure capable of plugging into an external power cord. In some embodiments, the power interface 511 can be connected to both the battery pack 70 and a power cord, thereby improving the flexibility of using the power tool.

[0056] like Figure 1 and Figure 2 As shown, the power tool also includes a second handle 52 for the operator's other hand to grip. By gripping both the first handle 51 and the second handle 52, the operator can more stably control the working direction of the power tool. In some embodiments, such as... Figure 2 As shown, the second handle 52 is located on the side of the housing assembly 10.

[0057] In order to reduce the vibration intensity at the second handle 52, in related technologies, an elastic element is provided between the second handle 52 and the main housing 11. However, the provision of the elastic element will have an adverse effect on the directional control of the electric hammer.

[0058] In this regard, such as Figure 2 and Figure 3 As shown, the housing assembly 10 also includes a second handle mounting part 13a, which is a part that can be separated from the main housing 11. The second handle 52 is mounted on the second handle mounting part 13a. That is to say, the second handle mounting part 13a and the main housing 11 are first formed separately and then connected together by a connecting structure. When the power tool is working, there will be significant energy loss when the vibration energy is transmitted between the main housing 11 and the second handle mounting part 13a. This not only has a significant shock absorption effect on the second handle 52 mounted on the second handle mounting part 13a, but also has a certain shock absorption effect on the entire power tool. In addition, the installation of the second handle 52 can maintain a rigid connection, thereby facilitating the operator to accurately control the direction.

[0059] In some embodiments, such as Figure 3 As shown, the second handle mounting portion 13a is cylindrical and is mounted at the front end of the main housing 11, thus also located in front of the motor 30. The rear part of the transmission mechanism 40 is housed in the main housing 11, and the front part is surrounded by the second handle mounting portion 13a. Specifically, the rear part of the gearbox 41 is housed in the main housing 11, and the front part extends into and is surrounded by the second handle mounting portion 13a.

[0060] In some embodiments, such as Figure 3As shown, a first damping element 61 is sandwiched between the second handle mounting portion 13a and the gearbox 41 of the transmission mechanism 40. When the power tool is working and generating vibration, the first damping element 61 can buffer the vibration, thereby reducing the vibration of the gearbox 41. Optionally, the first damping element 61 is a rubber ring, which is an existing standard part with low cost, thus helping to reduce the overall manufacturing cost of the power tool. Optionally, an annular limiting groove is provided on the outer circumferential surface of the gearbox 41 corresponding to the second handle mounting portion 13a. The first damping element 61 is disposed in the annular limiting groove, which can axially limit the first damping element 61, preventing the first damping element 61 from shifting position during the operation of the power tool, and ensuring reliable vibration reduction of the gearbox 41. In other embodiments, the first damping element 61 can also be a cylindrical structure made of foamed material, as long as it can play a vibration reduction role.

[0061] In some embodiments, such as Figure 3 As shown, the rear end of the second handle mounting part 13a engages with the front end of the main housing 11. Specifically, the rear end of the second handle mounting part 13a has an annular groove 131 on its outer circumferential surface, and the front end of the main housing 11 has an annular rib 116 protruding radially inward. When the second handle mounting part 13a is inserted rearward into the front end of the main housing 11, the annular rib 116 engages with the annular groove 131, thereby achieving the connection between the two. In other embodiments, the second handle mounting part 13a and the main housing 11 can also be connected by other engaging methods or by fasteners, which are not specifically limited here.

[0062] like Figure 3 As shown, a second damping element 62 is sandwiched between the second handle mounting portion 13a and the main housing 11. When the power tool is working and generating vibration, the second damping element 62 can buffer the vibration, thereby further reducing the vibration at the second handle 52 and improving the user experience. Optionally, the second damping element 62 is a rubber ring. In this embodiment, the second damping element 62 is sleeved on the second handle mounting portion 13a and located within the annular groove 131. Optionally, as... Figure 3 As shown, the second damping element 62 is sandwiched between the inner wall of the annular rib 116 and the inner wall of the annular groove 131 in the front-back direction. In other embodiments, the second damping element 62 may also be sandwiched between the outer wall of the annular rib 116 and the inner side of the annular groove 131 in the front-back direction.

[0063] like Figure 2 and Figure 3As shown, the first handle 51 is optionally installed in the first handle mounting part 12, and the second handle 52 is optionally installed in the second handle mounting part 13a. That is, the second handle 52 and the second handle mounting part 13a are detachably connected. The operator can choose to use the second handle 52 or not use the second handle 52 according to the actual working scenario. For example, in the case of a narrow working space, the second handle 52 can be removed.

[0064] In some embodiments, such as Figure 2 As shown, the second handle 52 is fitted onto the second handle mounting portion 13a, thereby ensuring the reliability of the connection between the second handle 52 and the second handle mounting portion 13a, and also making the force between the second handle 52 and the second handle mounting portion 13a more uniform. Figure 2 As shown, the second handle 52 includes a handle body 521 and a handle glove 522. The handle body 521 is for the operator to grip, and the handle glove 522 is fitted onto the second handle mounting portion 13a. In some embodiments, the handle glove 522 can be an adjustable clamp structure to facilitate attachment and detachment from the second handle mounting portion 13a. In some embodiments, the handle glove 522 can also be connected to the second handle mounting portion 13a by fasteners.

[0065] like Figure 4 and Figure 5 As shown, in some embodiments, the electric hammer includes a housing assembly 10, a working head 20, a motor 30, and a transmission mechanism 40. The working head 20 is at least partially exposed in the housing assembly 10. The motor 30 is housed in the housing assembly 10 and is used to drive the working head 20. The housing assembly 10 includes a main housing 11. The transmission mechanism 40 is coupled to both the motor 30 and the working head 20 for transmitting torque between them. The transmission mechanism 40 includes a gearbox 41 extending in a front-rear direction. The housing assembly 10 also includes a second housing 13b separable from the main housing 11. The rear end of the gearbox 41 is housed in the main housing 11, and the front end extends into the second housing 13b. A first damping element 61 is sandwiched between the second housing 13b and the gearbox 41. In this embodiment, when the power tool is working, there is significant energy loss during the transmission of vibration energy between the main housing 11 and the second housing 13b. The second damping element 62 buffers the vibration, thus significantly reducing vibration in the gearbox 41, preventing damage to the gearbox 41 and its internal components, and extending the service life of the electric hammer. In this embodiment, the second housing 13b is cylindrical and radially fitted onto the front of the gearbox 41. Furthermore, the second damping element 62 is sandwiched between the second housing 13b and the main housing 11, further enhancing the vibration reduction effect on the gearbox 41. In this embodiment, the electric hammer may also be equipped with a second handle 52, which is selectively installed. Optionally, the second handle 52 is fitted onto the second housing 13b.

[0066] During the operation of power tools, heat will be generated at the motor 30 and gearbox 41. If the heat cannot be dissipated in time, the power tool may become unusable due to overheating, affecting the user experience. In severe cases, it may also damage the motor 30 and transmission mechanism 40, affecting the service life of the power tool.

[0067] In this regard, such as Figure 6 As shown, the housing assembly 10 is provided with an air inlet 111 and an air outlet 112. Low-temperature airflow from outside the housing assembly 10 can enter the housing assembly 10 through the air inlet 111 and exit through the air outlet 112. During the flow of airflow inside the housing assembly 10, it can carry away the heat generated by the motor 30 and the gearbox 41, thereby achieving cooling of the motor 30 and the gearbox 41.

[0068] In some embodiments, the power tool is used alone, with the air inlet 111 either normally open or manually opened. External airflow can automatically enter the air inlet 111, or be driven into the air inlet 111 by internal components of the power tool. The internal component of the power tool capable of driving external airflow into the air inlet 111 can be a fan. Optionally, the fan 33 is connected to the motor shaft 32 of the motor 30, and the fan 33 rotates when the motor shaft 32 rotates, thereby driving the airflow.

[0069] In some work scenarios, power tools generate a lot of dust during operation, so it is necessary to use them with external equipment, such as a vacuum cleaner, to remove the dust and improve the working environment for the operator.

[0070] Based on the above-mentioned work scenarios, such as Figure 6 As shown, the housing assembly 10 is also provided with a connecting portion 16, which is used to couple an external device 90, and the external device 90 blows air into the air inlet 111. Taking a vacuum cleaner as an example, after the vacuum cleaner is attached to the connecting portion 16, its airflow outlet is opposite to the air inlet 111, thereby enabling air to be blown into the air inlet 111. The blowing or air blowing in this application is intended to describe the airflow direction, rather than emphasizing the action implementer. That is to say, the external device or vacuum cleaner may not have a fan, but as mentioned above, the external airflow is driven into the air inlet 111 by the fan 33 inside the power tool. In this embodiment, the air inlet 111 is provided on the main housing 11, and its orientation is the same as that of the working head 20, that is, the air inlet 111 is set facing forward. The air inlet 111 is set in this way to facilitate being opposite to the airflow outlet of the external device 90.

[0071] In some work scenarios, power tools generate dust during operation, but when not used with external equipment, the dust can enter the housing assembly 10 in large quantities through the air inlet 111, thus affecting the service life of the internal components of the power tool. To address this, the housing assembly 10 also includes an opener / closer 17, which can selectively block or expose the air inlet 111. Specifically, when it is necessary to connect an external device 90 to blow air into the air inlet 111, the opener / closer 17 exposes the air inlet 111; when it is not necessary to connect the external device 90 and the amount of dust is large, the opener / closer 17 can be closed.

[0072] like Figures 6-8 As shown, the connecting part 16 includes a movable component 161, and an opener / closer 17 is disposed at the air inlet 111 and is linked with the movable component 161. When the external device 90 is coupled to the connecting part 16, the movable component 161 is displaced, causing the opener / closer 17 to rotate, thereby exposing the air inlet 111. In other words, during the coupling process between the external device 90 and the connecting part 16, the opener / closer 17 automatically opens through linkage, without requiring additional operation by the operator, thus greatly improving the convenience of using power tools.

[0073] In some embodiments, such as Figure 6 As shown, the connecting part 16 also includes a slot 162, through which the external device 90 is coupled with the power tool. Specifically, before the external device 90 is inserted into the slot 162, the movable member 161 partially extends into the slot 162. During the insertion of the external device 90 into the slot 162, the movable member 161 is compressed, thereby causing the movable member 161 to move. In this embodiment, the slot 162 is provided on the main housing 11 and is located on the left and right sides of the main housing 11.

[0074] like Figure 6 As shown, the movable component 161 is a push rod, which can move relative to the main housing 11, thereby extending into the slot 162 or being pushed out of the slot 162 by the external device 90. Specifically, the main housing 11 is provided with a guide groove 113, the opening of which is opposite to the slot 162. One end of the movable component 161 is inserted into the guide groove 113 and slides in cooperation with it. The guide groove 113 limits the movement trajectory of the movable component 161, so that the other end of the movable component 161 can extend into or exit the slot 162 and drive the opening / closing device 17 to rotate precisely. In this embodiment, the movable component 161 can move in the left-right direction.

[0075] In some embodiments, the end of the push rod that extends into the slot 162 is provided with a mating inclined surface 1612. During the process of the external device 90 being inserted into the slot 162 in the front-back direction, the external device 90 presses against the mating inclined surface 1612 to cause the push rod to move in the left-right direction so as to exit the slot 162.

[0076] like Figure 6 As shown, the opener / closer 17 includes a baffle portion 171. The push rod is displaced under the pressure of the external device 90, causing the baffle portion 171 to rotate and expose the air inlet 111. Specifically, the moving member 161 is provided with a first transmission portion 1611, and the opener / closer 17 also includes a second transmission portion 172, with the first transmission portion 1611 meshing with the second transmission portion 172. In this embodiment, the first transmission portion 1611 is a rack and pinion structure, and the second transmission portion 172 is a gear structure. This gear structure does not have to be a complete gear, as long as it ensures that within the meshing range, the baffle portion 171 can block or expose the air inlet 111. In other embodiments, the first transmission portion 1611 can also be a worm gear structure, and the second transmission portion 172 can be a corresponding turbine structure.

[0077] like Figure 6 and Figure 7 As shown, the power tool also includes an elastic element 18, which abuts against the movable part 161 and the main housing 11. After the external device 90 is removed, the elastic element 18 can drive the movable part 161 back to its original position, thereby causing the opener 17 to rotate and block the air inlet 111. This arrangement not only prevents external dust and other impurities from entering the housing assembly 10 through the air inlet 111, but also eliminates the need for additional operation by the operator, thus improving the convenience of using the power tool. Specifically, the elastic element 18 can be a spring 15. Optionally, the spring 15 is disposed in a guide groove 113, which can limit the elastic element 18, thereby preventing the elastic element 18 from falling off and failing during vibration.

[0078] like Figure 6 As shown, in this embodiment, the air inlet 111 is located at a lower position on the main housing 11, and the air inlet 111 is positioned above the joint 16. This arrangement prevents the joint 16 from obstructing the upward flow of air, ensuring that the airflow can fully contact the components to be cooled.

[0079] Since the motor 30 generates a lot of heat and has a large cooling requirement, the airflow entering the housing assembly 10 from the air inlet 111 in this application passes through the motor 30 at least before being discharged from the air outlet 112, thereby ensuring that the motor 30 can be adequately cooled.

[0080] In this application, the motor 30 includes a fan 33, and at least a portion of the airflow is redirected by the fan 33 before being discharged. By configuring the fan 33, the airflow entering the housing assembly 10 can be guided, allowing the airflow to flow more quickly to the areas requiring cooling, achieving precise cooling of specific components. Figure 6 and Figure 9As shown, the air outlet 112 is positioned near the edge of the fan blade 334 of the fan 33, where the fan 33 is a centrifugal fan. When the fan 33 rotates, the airflow within the housing assembly 10 approaches the fan 33 axially and flows radially under the centrifugal force of the fan 33, eventually being discharged from the air outlet 112.

[0081] In some embodiments, such as Figures 9-12 As shown, only one set of fan blades 334 is provided inside the housing assembly 10. This arrangement ensures that the airflow path of the vacuum cleaner is consistent with at least part of the heat dissipation path.

[0082] In some embodiments, such as Figure 6 and Figure 9 As shown ( Figure 9 (The dashed arrows in the diagram indicate the direction of airflow.) The air inlet 111 is located below the motor 30. The motor 30 also includes a motor body 31, which is mounted on the motor shaft 32. The fan 33 is mounted on the motor shaft 32 and located above the motor body 31. With this configuration, the airflow entering through the air inlet 111 passes through the motor shaft 32 from bottom to top and is discharged from the air outlet 112 on the side of the fan 33, ensuring effective cooling of the motor 30. In this embodiment, the fan 33 includes a baffle 333 and a set of fan blades 334. The fan blades 334 are located below the baffle 333, thereby driving the airflow below the motor 30 to move upwards through the motor body 31.

[0083] like Figure 6 and Figure 9 As shown, a second air outlet 114 is also provided on the housing assembly 10, and the second air outlet 114 is located on the top of the housing assembly 10. Therefore, part of the airflow entering the housing assembly 10 from the air inlet 111 can be discharged from the first air outlet 112 under the action of the fan 33. This process can cool the motor 30. Another part of the airflow can flow upward through the gearbox 41 and be discharged from the second air outlet 114. This part of the airflow can cool the gearbox 41, thereby cooling the components inside the power tool where heat is concentrated.

[0084] like Figure 9 As shown, the power tool also includes a shroud 80, which is configured to allow a portion of the airflow to pass through the gearbox 41 and be discharged from the second air outlet 114. By configuring the shroud 80 to guide the airflow, sufficient airflow is ensured to flow upwards through the gearbox 41, thereby ensuring effective cooling of the gearbox 41. In this embodiment, the shroud 80 is constructed as a cylindrical structure and is fitted around the outer periphery of the fan 33. Along the axial direction of the shroud 80, at least a portion of the inner wall of the shroud 80 is flared, with the cross-sectional area at the upper end of the flared inner wall being larger than that at the lower end. This configuration guides the airflow upwards.

[0085] like Figure 6 , Figures 10-12 As shown, the housing assembly 10 is provided with an air inlet 111, a second air inlet 115, and an air outlet 112. The second air inlet 115 is located at the top of the housing assembly 10. When the power tool is working, under the action of the external device 90 and the fan 33, part of the airflow enters the housing assembly 10 from the air inlet 111, and part of the airflow enters the housing assembly 10 from the second air inlet 115. The low-temperature airflow enters the housing assembly 10 from different positions, which helps to ensure that all components inside the housing assembly 10 can be cooled. Figures 10-12 In the embodiment shown, the airflow entering the housing assembly 10 from the second air inlet 115 flows through the gearbox 41, thereby ensuring that the gearbox 41 can be adequately cooled.

[0086] Optionally, the airflows entering from the air inlet 111 and the second air inlet 115 respectively are both discharged from the same air outlet 112.

[0087] In some embodiments, such as Figure 6 and Figure 10 As shown, the air inlet 111 is located below the motor 30. The airflow entering through the air inlet 111 moves upward to the motor 30 and then exits through the air outlet 112. The airflow entering through the second air inlet 115, driven by the fan 33, flows downward through the gearbox 41 and the motor 30 and then exits through the air outlet 112. In this embodiment, the fan blades 334 of the fan 33 are located on the upper side of the baffle 333, which is more conducive to driving the airflow entering through the second air inlet 115 downward. In some embodiments, the fan 33 is installed at the lower end of the motor body 31. In some embodiments, the fan 33 can also be installed at the upper end of the motor body 31. In this embodiment, the air inlet 111 is used to connect to the external device 90, and the external device 90 blows air onto the air inlet 111. The second air inlet 115 is a normal opening. In other embodiments, the air inlet 111 can also be set to a normal opening, while the second air inlet 115 is used to connect to the external device 90. Of course, in some usage scenarios, both the air inlet 111 and the second air inlet 115 can be connected to external devices 90.

[0088] In some embodiments, such as Figure 6 and Figure 11 As shown, the air inlet 111 is located below the gearbox 41 and above the motor 30. Airflow entering through the air inlet 111 is driven downwards by the fan 33, passes through the motor body 31, and exits through the air outlet 112. Airflow entering through the second air inlet 115 is driven downwards by the fan 33, first passing through the gearbox 41, then through the motor body 31, and exiting through the air outlet 112. In this embodiment, both airflows pass through the motor body 31, thus ensuring sufficient cooling for the motor 30, which has high cooling requirements. Figure 11As shown, the fan 33 is positioned below the motor body 31, and the fan blades 334 are positioned above the baffle 333, thereby better driving the airflow entering from the air inlet 111 and the second air inlet 115 downwards. In this embodiment, the air inlet 111 is used to connect to an external device 90, which blows air onto the air inlet 111, while the second air inlet 115 is a normal opening. In other embodiments, the air inlet 111 can also be configured as a normal opening, while the second air inlet 115 is used to connect to the external device 90. Of course, in some usage scenarios, both the air inlet 111 and the second air inlet 115 can be connected to the external device 90.

[0089] In some embodiments, such as Figure 6 and Figure 12 As shown, the air inlet 111 is located above the motor 30 and below the gearbox 41, and is positioned opposite to the gearbox 41. In this embodiment, the airflow entering from the air inlet 111 first flows upward through the gearbox 41 under the influence of its initial velocity, and then flows downward through the motor 30 under the drive of the fan 33 before being discharged from the air outlet 112. The airflow entering from the second air inlet 115, driven by the fan 33, flows downward through the gearbox 41 and then further downward through the motor 30 before being discharged from the air outlet 112. That is, both parts of the airflow pass through the gearbox 41 and the motor 30, thereby ensuring uniform heat dissipation. Figure 12 As shown, the fan 33 is positioned below the motor body 31, and the fan blades 334 are positioned above the baffle 333, thereby better driving the airflow at the air inlet 111 and the second air inlet 115 downwards. In this embodiment, the air inlet 111 is used to connect to an external device 90, which blows air onto the air inlet 111, while the second air inlet 115 is a normal opening. In other embodiments, the air inlet 111 can also be configured as a normal opening, while the second air inlet 115 is used to connect to the external device 90. Of course, in some usage scenarios, both the air inlet 111 and the second air inlet 115 can be connected to the external device 90.

[0090] In some embodiments, such as Figure 6 and Figure 13 As shown, the housing assembly 10 includes an air inlet 111, a second air inlet 115, and an air outlet 112. The fan 33 includes a first set of fan blades 331 and a second set of fan blades 332. The airflow entering through the air inlet 111 forms a first airflow path under the action of the first set of fan blades 331 and cools the motor 30; the airflow entering through the second air inlet 115 forms a second airflow path under the action of the second set of fan blades 332 and cools the gearbox 41. In this embodiment, the airflow entering through the air inlet 111 only cools the motor 30, and the airflow entering through the second air inlet 115 only cools the gearbox 41, thereby ensuring the reliability of cooling the motor 30 and the gearbox 41.

[0091] like Figure 13 As shown, the air inlet 111 is located below the motor 30. The airflow entering through the air inlet 111 flows upward through the motor body 31 under the drive of the fan 33 and is then discharged from the air outlet 112. The second air inlet 115 is located above the gearbox 41. The airflow entering through the second air inlet 115 flows downward through the gearbox 41 under the drive of the fan 33 and is then discharged from the air outlet 112.

[0092] In this embodiment, the first set of fan blades 331 and the second set of fan blades 332 are arranged back-to-back, thereby driving the airflow upward and downward respectively. Specifically, the fan 33 is located above the motor body 31, and the fan 33 also includes a baffle 333. The first set of fan blades 331 is located on the lower side of the baffle 333, and the second set of fan blades 332 is located on the upper side of the baffle 333. In this embodiment, the power tool also includes a guide shroud 80, which has a cylindrical structure and is fitted around the outer periphery of the fan 33. The guide shroud 80 is used to guide the airflow smoothly out of the air outlet 112. In this embodiment, the inner wall of the guide shroud 80 is arranged parallel to the fan.

[0093] In this embodiment, the air inlet 111 is used to connect to an external device 90, and the external device 90 blows air onto the air inlet 111. The second air inlet 115 is a normal opening. In other embodiments, the air inlet 111 can also be configured as a normal opening, while the second air inlet 115 is used to connect to the external device 90. Of course, in some usage scenarios, both the air inlet 111 and the second air inlet 115 can be connected to the external device 90.

[0094] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. An electric tool, comprising: Housing assembly (10); The working head (20) is at least partially exposed outside the housing assembly (10); A motor (30) for driving the working head (20), the motor (30) extending in the vertical direction; The housing assembly (10) is characterized by having an air inlet (111), an air outlet (112), and a connecting portion (16), wherein the connecting portion (16) is used to couple an external device (90) to allow airflow from the external device (90) into the air inlet (111); the airflow entering from the air inlet (111) flows through at least the motor (30) and then exits from the air outlet (112).

2. The power tool according to claim 1, characterized in that, The motor (30) includes a fan (33), and at least part of the airflow is discharged after its flow direction is changed by the fan (33).

3. The power tool according to claim 2, characterized in that, The air outlet (112) is located near the edge of the fan blades of the fan (33).

4. The power tool according to claim 1, characterized in that, The housing assembly (10) is also provided with a second air outlet (114), which is located on the top of the housing assembly (10).

5. The power tool according to claim 4, characterized in that, The power tool also includes a transmission mechanism (40) for transmitting torque between the motor (30) and the working head (20), and includes a gearbox (41) extending in a front-rear direction; the power tool also includes a shroud (80) configured to allow a portion of the airflow to pass through the gearbox (41) to be discharged from the second air outlet (114).

6. The power tool according to claim 2, characterized in that, The housing assembly (10) further includes a second air inlet (115), which is located on the top of the housing assembly (10).

7. The power tool according to claim 6, characterized in that, The power tool also includes a transmission mechanism (40) for transmitting torque between the motor (30) and the working head (20), and includes a gearbox (41) extending in the front-rear direction; airflow entering from the second air inlet (115) flows through the gearbox (41) and is discharged from the air outlet (112).

8. The power tool according to claim 6, characterized in that, The power tool also includes a transmission mechanism (40) for transmitting torque between the motor (30) and the working head (20), and includes a gearbox (41) extending in the front-rear direction; the fan (33) includes a first set of fan blades (331) and a second set of fan blades (332), the airflow flowing into the air inlet (111) forms a first air path under the drive of the first set of fan blades (331) and cools the motor (30); the airflow flowing into the second air inlet (115) forms a second air path under the drive of the second set of fan blades (332) and cools the gearbox (41).

9. The power tool according to claim 1, characterized in that, The air inlet (111) is oriented in the same direction as the working head (20) and is located below the motor (30) in the vertical direction.

10. The power tool according to claim 1, characterized in that, The power tool in question is an electric hammer.

11. An electric tool, comprising: Housing assembly (10); The working head (20) is at least partially exposed outside the housing assembly (10); A motor (30) is used to drive the working head (20), and the motor shaft (32) of the motor (30) extends in the vertical direction; The housing assembly (10) is characterized by having an air inlet (111), an air outlet (112), and a connecting part (16), wherein the connecting part (16) is used to couple an external device (90) to allow airflow from the external device (90) into the air inlet (111); and the housing assembly (10) contains only one set of fan blades.

12. An electric tool, comprising: Housing assembly (10); The working head (20) is at least partially exposed outside the housing assembly (10); A motor (30), housed in the housing assembly (10), is used to drive the working head (20), the motor (30) including a fan (33); A transmission mechanism (40), housed in the housing assembly (10), is coupled to the motor (30) and the working head (20) respectively, for transmitting torque between the motor (30) and the working head (20), the transmission mechanism (40) including a gearbox (41) extending in the front-rear direction; The housing assembly (10) is characterized in that it includes an air inlet (111) and a second air inlet (115), and the fan (33) includes a first set of fan blades (331) and a second set of fan blades (332). The airflow flowing into the air inlet (111) forms a first air path under the drive of the first set of fan blades (331) to cool the motor (30); the airflow flowing into the second air inlet (115) forms a second air path under the drive of the second set of fan blades (332) to cool the gearbox (41).

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