Electric tool, electric hammer, and impact tool

Abstract

The present application discloses an electric tool, an electric hammer, and an impact tool. The electric hammer comprises: a housing assembly; a working head at least partially exposed from the housing assembly; a motor accommodated in the housing assembly and used for driving the working head; and a transmission mechanism accommodated in the housing assembly, separately coupled to the motor and the working head, and used for transmitting torque between the motor and the working head, the transmission mechanism comprising a sleeve extending in the front-rear direction and an impact assembly arranged in the sleeve, the impact assembly comprising a first impact element and a second impact element, and the working head, the first impact element, and the second impact element being arranged in sequence. The impact assembly has a first position and a second position. When the impact assembly is in the first position, at least one of the first impact element and the second impact element and the sleeve form a sealed cavity. When the impact assembly is in the second position, the sealing between the first impact element and the sleeve and between the second impact element and the sleeve is released. The electric hammer has a good vibration damping effect, and the vibration damping effect does not degrade even after prolonged use.

Description

Power tools, electric hammers and impact tools Technical Field

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

[0002] An electric hammer is an impact tool that converts the rotational motion of a motor into the linear reciprocating motion of a working head, allowing it to remove work media through hammering. Based on its working principle, an electric hammer generates significant vibration during operation; therefore, reducing vibration and improving the feel of the workpiece has always been a focus of its development.

[0003] During operation, electric hammers generate a lot of dust. Furthermore, the gearbox, motor, and PCB all produce significant heat. Heat dissipation issues can shorten the machine's lifespan and negatively impact the user experience—overheating can render the machine unusable. Using an electric hammer in conjunction with a vacuum cleaner can alleviate these problems.

[0004] Typically, an electric hammer includes a motor, a working head, and a transmission mechanism for transmitting torque between the motor and the working head. The transmission mechanism includes a sleeve and an impact element housed within the sleeve. After the working head separates from the working surface, the impact element strikes the sleeve axially, transmitting vibration to the hammer's housing assembly, resulting in noticeable vibration and a poor user experience. Related technologies incorporate cushioning elements such as rubber rings between the impact element and the sleeve to reduce vibration.

[0005] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0006] One objective of this application is to solve or at least alleviate some or all of the aforementioned problems.

[0007] One objective of this application is to provide a power tool in which a second handle is mounted on a second handle mounting portion that is independent of the main housing, thereby providing a shock-absorbing effect for the second handle. To achieve the above objective, this application adopts the following technical solution:

[0008] An electric tool includes: a housing assembly including a main housing; a working head, at least partially exposed in the housing assembly; a motor housed in the housing assembly for driving the working head; and a transmission mechanism, at least partially housed in the main housing and coupled to both the motor and the working head, the transmission mechanism being used to transmit torque between the motor and the working head; the housing assembly further includes: a first handle mounting portion and a second handle mounting portion, respectively for mounting a first handle and a second handle; the first handle mounting portion is formed on the main housing and integrally molded with the main housing, and the second handle mounting portion is a part separable from the main housing.

[0009] In some embodiments, a first damping element is sandwiched between the second handle mounting portion and the transmission mechanism; and / or, a second damping element is sandwiched between the second handle mounting portion and the main housing.

[0010] In some embodiments, the first damping element is a rubber ring, and the second damping element is a rubber ring.

[0011] In some embodiments, the first handle is optionally mounted on the first handle mounting portion, and the second handle is optionally mounted on the second handle mounting portion.

[0012] In some embodiments, the transmission mechanism extends in a front-to-back direction, with its rear portion housed in the main housing and its front portion surrounded by the second handle mounting portion.

[0013] In some embodiments, the motor extends in a vertical direction, and the second handle mounting portion is disposed in front of the motor.

[0014] In some embodiments, the second glove is mounted on the second handle.

[0015] In some embodiments, the power tool further includes a power interface disposed on the first handle.

[0016] In some embodiments, the power interface is a battery pack interface for connecting a battery pack.

[0017] In some embodiments, the power tool is an electric hammer.

[0018] An electric hammer includes: a housing assembly including a main housing; a working head, at least partially exposed in the housing assembly; a motor housed in the housing assembly for driving the working head; a transmission mechanism coupled to the motor and the working head for transmitting torque between the motor and the working head, the transmission mechanism including a gearbox extending in a front-rear direction, the gearbox being at least partially housed in the main housing; the housing assembly further includes a second housing separable from the main housing, a first damping element sandwiched between the second housing and the gearbox.

[0019] In some embodiments, the second housing is cylindrical and is radially fitted onto the front of the gearbox.

[0020] In some embodiments, a second damping element is sandwiched between the second housing and the main housing.

[0021] In some embodiments, the electric hammer further includes a first handle, and the main housing includes an upper mounting point and a lower mounting point, with the upper end of the first handle mounted to the upper mounting point and the lower end of the first handle mounted to the lower mounting point.

[0022] In some embodiments, the upper end of the first handle is connected to the upper mounting point via a connecting rod and a spring, the connecting rod supporting tension and the spring supporting compression.

[0023] In some embodiments, the lower end of the first handle is pivotally connected to the lower end mounting point.

[0024] In some embodiments, the first handle is provided with a battery pack interface for connecting a battery pack.

[0025] In some embodiments, the electric hammer further includes a second handle, which is selectively installed and can be fitted onto the second housing.

[0026] In the power tool of this application, the second handle mounting part is configured as a part that can be separated from the main body housing, that is, the second handle mounting part is a component independent of the main body housing. When vibration energy is transmitted between the main body housing and the second handle mounting part, there will be significant energy loss. Therefore, it can play a significant shock-absorbing role for the second handle mounted on the second handle mounting part, and also play a certain shock-absorbing role for the entire power tool. In addition, the installation of the second handle can maintain a rigid connection, thereby facilitating the operator to accurately control the direction.

[0027] Another objective of this application is to provide a power tool whose air inlet automatically opens when coupled to an external device. To achieve the above objective, this application adopts the following technical solution:

[0028] 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 housing assembly is provided with an air inlet and a coupling portion, the coupling portion for coupling an external device to allow airflow from the external device into the air inlet; wherein the coupling portion includes a movable member, and an opener / closer linked to the movable member is provided at the air inlet, when the external device is coupled to the coupling portion, the movable member is displaced, causing the opener / closer to rotate to expose the air inlet.

[0029] In some embodiments, the joint also includes a slot, which can compress the movable part to move when an external device is inserted into the slot.

[0030] In some embodiments, the movable element is a push rod, the first end of which can extend into or retract from the slot.

[0031] In some embodiments, the opener includes a baffle portion, and the push rod is displaced under the pressure of an external device, causing the baffle portion to rotate and expose the air inlet.

[0032] In some embodiments, the housing assembly includes a main housing, and the power tool also includes an elastic element abutting between the movable part and the main housing. After the external device is removed, the elastic element can drive the movable part back to its original position, thereby causing the opener to rotate and block the air inlet.

[0033] In some embodiments, the motor shaft of the motor extends in the vertical direction, and the air inlet is located below the motor.

[0034] In some embodiments, the airflow enters the housing assembly from the air inlet and then passes through the motor along the motor shaft.

[0035] In some embodiments, the air inlet is located above the joint.

[0036] In some embodiments, the power tool is an electric hammer.

[0037] In some embodiments, the external device is a vacuum cleaner, with the airflow outlet of the vacuum cleaner facing the air inlet.

[0038] The power tool of this application automatically opens its air inlet when installing external equipment and automatically closes its air inlet when removing external equipment, making it easy to operate.

[0039] Another 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:

[0040] 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.

[0041] In some embodiments, the motor includes a fan, and at least a portion of the airflow is discharged after the fan changes its direction.

[0042] In some embodiments, the air outlet is positioned near the edge of the fan blades.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In some embodiments, the housing assembly further includes a second air inlet disposed on the top of the housing assembly.

[0047] 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.

[0048] 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, the 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; the 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.

[0049] 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.

[0050] In some embodiments, the power tool is an electric hammer.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In some embodiments, the air inlet is located below the motor.

[0056] 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.

[0057] In some embodiments, the air inlet is positioned opposite the gearbox.

[0058] In some embodiments, the air outlet is positioned near the edge of the fan blade.

[0059] 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.

[0060] In some embodiments, the power tool is an electric hammer.

[0061] 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.

[0062] In some embodiments, the housing assembly includes an air outlet, from which both a first air passage and a second air passage discharge.

[0063] In some embodiments, the air inlet is used to connect to an external device, and the second air inlet is a normal opening.

[0064] In some embodiments, the air inlet is located below the motor.

[0065] In some embodiments, the second air inlet is located above the gearbox.

[0066] In some embodiments, the first set of fan blades and the second set of fan blades are arranged back to back.

[0067] In some embodiments, the power tool also includes a switch that can selectively block or expose the air inlet.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Another objective of this application is to provide an electric hammer and impact tool, in which a sealed cavity can be formed between the impact component and the sleeve, thereby achieving shock absorption through air pressure. This provides good shock absorption, prevents failure even after prolonged use, and is low in cost. To achieve the above objectives, this application adopts the following technical solution:

[0073] An electric hammer 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; and a transmission mechanism, housed in the housing assembly and coupled to the motor and the working head, for transmitting torque between the motor and the working head. The transmission mechanism includes a sleeve extending in a front-rear direction and an impact assembly disposed within the sleeve. The impact assembly includes a first impact element and a second impact element, and the working head, the first impact element, and the second impact element are arranged sequentially from front to back. The impact assembly has a first position and a second position. When the impact assembly is in the first position, at least one of the first and second impact elements forms a sealed cavity with the sleeve. When the impact assembly is in the second position, the seal between the first and second impact elements and the sleeve is released.

[0074] In some embodiments, the first position is in front of the second position.

[0075] In some embodiments, when the working head presses against the working surface, the impact component moves to a second position; when the working head is released from the working surface, the impact component moves to a first position.

[0076] In some embodiments, the radius of the first impact element varies with the axial position; the radius of the second impact element also varies with the axial position.

[0077] In some embodiments, a sealing ring is installed directly or indirectly on the inner wall of the sleeve.

[0078] In some embodiments, the second impact element is an impact hammer, and the sleeve includes an air hole. When the impact hammer is in the first position, the hammer body of the impact hammer blocks the air hole and forms a first sealing cavity between itself and the sleeve.

[0079] In some embodiments, a gripper is provided inside the sleeve, and a sealing ring A is provided inside the gripper. When the impact hammer is in the first position, the hammer head of the impact hammer abuts against the sealing ring A inside the gripper.

[0080] In some embodiments, the first impact element is an impact rod, which includes at least one annular groove in which a sealing ring B is installed, and the sealing ring B abuts against the inner wall of the sleeve.

[0081] In some embodiments, the sleeve is axially movable, and when the sleeve moves forward axially, it is limited by a buffer element on the outside of the sleeve.

[0082] In some embodiments, the sleeve moves forward as the working head is released from the working face.

[0083] An impact 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; and a transmission mechanism, housed in the housing assembly and coupled to both the motor and the working head, for transmitting torque between the motor and the working head. The transmission mechanism includes a sleeve extending in a longitudinal direction and an impact element disposed within the sleeve, the impact element providing an axial impact force to the working head. The impact element has a first position and a second position, wherein when the impact element is in the first position, the impact element and the sleeve form a sealed cavity; and when the impact element is in the second position, the seal between the impact element and the sleeve is released.

[0084] In some embodiments, the sleeve is provided with an air outlet, and the impact element is provided with a mating part. When the impact element is in the first position, the mating part blocks the air outlet to form a sealed cavity; when the impact element is in the second position, the mating part avoids the air outlet so that the air outlet connects the inside and outside of the sleeve.

[0085] In some embodiments, a sealing ring is provided at the air outlet.

[0086] In some embodiments, the first position is in front of the second position.

[0087] In some embodiments, when the working head presses against the working surface, the impact element moves to a second position; when the working head is released from the working surface, the impact element moves to a first position.

[0088] In some embodiments, the radius of the impact element varies with the axial position.

[0089] In some embodiments, a sealing ring is installed directly or indirectly on the inner wall of the sleeve, and when the impact element is in the first position, the impact element abuts against the sealing ring.

[0090] In some embodiments, the impact element is an impact hammer, and the sleeve includes an air hole. When the impact hammer is in the first position, the hammer body of the impact hammer blocks the air hole and forms a sealed cavity with the sleeve.

[0091] In some embodiments, a limiting element is provided inside the sleeve, and a sealing ring is installed on the limiting element. When the impact hammer is in the first position, the hammer head of the impact hammer abuts against the sealing ring of the limiting element.

[0092] In some embodiments, the impact element is an impact rod, which includes at least one annular groove in which a sealing ring is installed, and the sealing ring abuts against the inner wall of the sleeve.

[0093] In some embodiments, the sleeve includes a cylinder and an end located at the front end of the cylinder, the end being provided with an opening; the impact element includes a main body and a rod, the main body being disposed inside the sleeve, the rod extending from the opening to the outside of the sleeve, the radius of the rod varying along the axial position to seal the opening at a first position and form a sealed cavity between the rod and the sleeve.

[0094] In some embodiments, the sleeve is axially movable, and when the sleeve moves forward axially, it is limited by a buffer element on the outside of the sleeve.

[0095] In some embodiments, the sleeve moves forward as the working head is released from the working face.

[0096] The electric hammer and impact tool of this application, after the working head is released from the working surface, the impact component moves along the sleeve from the second position to the first position. At this time, a sealed cavity can be formed between the impact component and the sleeve. When the impact component continues to move along the sleeve, it will compress the air in the sealed cavity, thereby converting the kinetic energy of the impact component into the internal energy of the air, thus significantly reducing the impact energy between the impact component and the sleeve, that is, forming air pressure damping, with good damping effect, and the internal energy of the air is finally dissipated in the form of heat. In addition, compared with the existing schemes that set rubber rings and other buffers, not only can the damping feel be maintained for a longer time, but it is also unnecessary to set high fatigue impact resistant components, resulting in low cost. Attached Figure Description

[0097] Figure 1 is a schematic diagram of the structure of the first type of electric hammer provided in the embodiment of this application;

[0098] Figure 2 is a top view of the structure in Figure 1;

[0099] Figure 3 is a cross-sectional view of AA in Figure 2;

[0100] Figure 4 is a schematic diagram of the structure of the second type of electric hammer provided in the embodiment of this application;

[0101] Figure 5 is a cross-sectional view of the structure in Figure 4;

[0102] Figure 6 is a schematic diagram of the third type of electric hammer and external equipment provided in the embodiment of this application;

[0103] Figure 7 is a schematic diagram of the internal structure during the process of attaching the external device to the joint provided in the embodiment of this application;

[0104] Figure 8 is a schematic diagram of the internal structure of the external device and the connecting part after they are fully connected according to the embodiment of this application;

[0105] Figure 9 is a schematic diagram of the internal airflow of the first type of electric hammer provided in the embodiment of this application;

[0106] Figure 10 is a schematic diagram of the internal airflow of the second type of electric hammer provided in the embodiment of this application;

[0107] Figure 11 is a schematic diagram of the internal airflow of the third type of electric hammer provided in the embodiment of this application;

[0108] Figure 12 is a schematic diagram of the internal airflow of the fourth type of electric hammer provided in the embodiments of this application;

[0109] Figure 13 is a schematic diagram of the internal airflow of the fifth type of electric hammer provided in the embodiment of this application;

[0110] Figure 14 is a schematic diagram of the internal structure of the impact assembly of the electric hammer provided in the embodiment of this application in the second position;

[0111] Figure 15 is a schematic diagram of the internal structure of the impact assembly of the electric hammer provided in the embodiment of this application when it moves to the first position;

[0112] Figure 16 is a schematic diagram of the impact component of the electric hammer provided in the embodiment of this application moving forward a certain distance from the position shown in Figure 15;

[0113] Figure 17 is a schematic diagram of the impact component of the electric hammer provided in the embodiment of this application moving forward a certain distance from the position shown in Figure 16;

[0114] Figure 18 is an enlarged view of point E in Figure 15;

[0115] Figure 19 is an enlarged view of point F in Figure 16.

[0116] In the picture:

[0117] 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;

[0118] 20. Working head;

[0119] 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;

[0120] 40. Transmission mechanism; 41. Gearbox; 42. Gear set; 43. Eccentric component; 44. Reciprocating motion component;

[0121] 45. Sleeve; 451. Vent; 452. Cylinder body; 453. End; 454. Opening; 455. Inner stop;

[0122] 46. ​​Impact components;

[0123] 461. First impact element; 4611. Annular groove; 4612. Main body; 4613. Rod body; 4613a. First rod part; 4613b. Second rod part;

[0124] 462. Second impact element; 4621. Hammer body; 4622. Hammer head;

[0125] 471. Sealing ring A; 472. Sealing ring B; 473. Sealing ring C; 474. Sealing ring D;

[0126] 48. Holding a hammer;

[0127] 491. Buffer element; 492. Fixing element;

[0128] 401. First sealing cavity; 402. Second sealing cavity;

[0129] 51. First handle; 511. Power interface; 52. Second handle; 521. Handle body; 522. Handle glove;

[0130] 61. First damping element; 62. Second damping element;

[0131] 70. Battery pack;

[0132] 80. Fairing;

[0133] 90. External devices. Detailed Implementation

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] This embodiment provides a power tool, specifically an impact tool, which can be an electric hammer. The following description uses an electric hammer as an example of an impact tool.

[0142] As shown in Figures 1-3, the impact 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 accessories for operation or can directly contact the medium to be worked. 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.

[0143] As shown in Figures 2 and 3, 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 approximately 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 coupled to the reciprocating motion component 44, 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.

[0144] 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.

[0145] As shown in Figure 3, 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 housed within the gearbox 41, thereby supporting and protecting the various components of the transmission mechanism 40. In other words, the gearbox 41 in this embodiment is not, in a narrow sense, a housing that merely encloses the gears, but rather serves to enclose the various transmission components within the transmission mechanism 40.

[0146] In this embodiment, the motor 30 is arranged vertically, and the transmission mechanism 40 is arranged in the front-to-back direction. As shown in Figure 3, the main housing 11 is roughly "7" shaped and includes a vertical component and a horizontal portion, wherein the motor 30 is disposed in the vertical portion, and the gearbox 41 extends in the front-to-back direction and is at least partially disposed in the horizontal portion.

[0147] As shown in Figures 1-3, the impact tool also includes a first handle 51, and the housing assembly 10 also includes a first handle mounting part 12. The first handle 51 is mounted on the first handle mounting part 12 for the operator to hold with one hand.

[0148] In some embodiments, the first handle mounting portion 12 is located at the rear of the main housing 11. As shown in FIG3, the first handle mounting portion 12 is connected to the main housing 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 arrangement, the first handle 51 and the main housing 11 form a closed loop, which not only facilitates the user's grip but also reduces the risk of accidental drop during gripping.

[0149] 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 impact 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.

[0150] As shown in Figure 3, 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 impact 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 impact 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.

[0151] When the upper end of the first handle 51 moves relative to the upper mounting point 121, to prevent excessive force between the lower mounting point 122 and the first handle 51 from causing damage, as shown in Figure 3, 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.

[0152] As shown in Figure 3, the impact 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 being plugged 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 the impact tool.

[0153] As shown in Figures 1 and 2, the impact tool also includes a second handle 52 for the operator to hold with their other hand. By holding the first handle 51 and the second handle 52 respectively, the operator can more stably control the working direction of the impact tool. In some embodiments, as shown in Figure 2, the second handle 52 is located on the side of the housing assembly 10.

[0154] 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.

[0155] As shown in Figures 2 and 3, 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 impact 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-absorbing effect on the second handle 52 mounted on the second handle mounting part 13a, but also has a certain shock-absorbing effect on the entire impact tool. In addition, the installation of the second handle 52 can maintain a rigid connection, thereby facilitating the operator to accurately control the direction.

[0156] In some embodiments, as shown in FIG3, 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 accommodated 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 accommodated in the main housing 11, and the front part extends into and is surrounded by the second handle mounting portion 13a.

[0157] In some embodiments, as shown in FIG3, 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 impact 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 impact tool. Optionally, an annular limiting groove is set on the outer peripheral surface of the gearbox 41 corresponding to the second handle mounting portion 13a, and the first damping element 61 is disposed in the annular limiting groove. The annular limiting groove can axially limit the first damping element 61, preventing the first damping element 61 from shifting position during the operation of the impact 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.

[0158] In some embodiments, as shown in FIG3, the rear end of the second handle mounting part 13a is engaged 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 peripheral 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 is engaged in 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 snap-fit ​​methods or by fasteners, which are not specifically limited here.

[0159] As shown in Figure 3, a second damping element 62 is sandwiched between the second handle mounting portion 13a and the main housing 11. When the impact tool operates and generates 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 shown in Figure 3, 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 can 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.

[0160] As shown in Figures 2 and 3, 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, depending on the actual working scenario. For example, in a scenario where the working space is narrow, the second handle 52 can be removed.

[0161] In some embodiments, as shown in FIG2, 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. As shown in FIG2, the second handle 52 includes a handle body 521 and a handle glove 522. The handle body 521 is used 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 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.

[0162] As shown in Figures 4 and 5, 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 to transmit 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 impact 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.

[0163] During the operation of the impact tool, heat will be generated at the motor 30 and gearbox 41. If the heat cannot be dissipated in time, the impact 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 impact tool.

[0164] As shown in Figure 6, 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.

[0165] In some embodiments, the impact 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 impact tool. The internal component of the impact 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.

[0166] In some work scenarios, impact 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 operators.

[0167] Based on the above-mentioned operating scenario, as shown in Figure 6, the housing assembly 10 is also provided with a connecting part 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 part 16, its airflow outlet is opposite to the air inlet 111, thereby enabling it to blow air 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 impact 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 its alignment with the airflow outlet of the external device 90.

[0168] In some operational scenarios, when impact tools generate dust during operation, but are not used in conjunction with external equipment, a large amount of dust can enter the housing assembly 10 through the air inlet 111, thereby affecting the service life of the internal components of the impact 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.

[0169] As shown in Figures 6-8, the connecting part 16 includes a movable component 161, and an opening / closing device 17 is located at the air inlet 111 and is linked with the movable component 161. When the external device 90 couples with the connecting part 16, the movable component 161 is displaced, causing the opening / closing device 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 opening / closing device 17 automatically opens through linkage, without requiring additional operation from the operator, thus greatly improving the convenience of using the impact tool.

[0170] In some embodiments, as shown in FIG6, the connecting portion 16 further includes a slot 162, through which the external device 90 is coupled with the impact 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.

[0171] As shown in Figure 6, the movable component 161 is a push rod that 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 within it. The guide groove 113 limits the movement trajectory of the movable component 161, allowing the other end of the movable component 161 to 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.

[0172] 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.

[0173] As shown in Figure 6, 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 part 1611, and the opener / closer 17 also includes a second transmission part 172, with the first transmission part 1611 and the second transmission part 172 meshing. In this embodiment, the first transmission part 1611 is a rack and pinion structure, and the second transmission part 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 part 1611 can also be a worm gear structure, and the second transmission part 172 can be a corresponding turbine structure.

[0174] As shown in Figures 6 and 7, the impact 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 / closer 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 ease of use of the impact 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.

[0175] As shown in Figure 6, 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.

[0176] 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.

[0177] In this application, 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. By setting the fan 33, the airflow entering the housing assembly 10 can be guided, allowing the airflow to flow more quickly to the area that needs to be cooled, achieving the effect of precise cooling of specific components. As shown in Figures 6 and 9, the air outlet 112 is located 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 in the housing assembly 10 approaches the fan 33 axially and flows radially under the centrifugal force of the fan 33, and finally is discharged from the air outlet 112.

[0178] In some embodiments, as shown in Figures 9-12, only one set of fan blades 334 is provided inside the housing assembly 10, so that the flow path of the airflow blown out by the vacuum cleaner is consistent with at least part of the heat dissipation path.

[0179] In some embodiments, as shown in Figures 6 and 9 (the dashed arrows in Figure 9 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.

[0180] As shown in Figures 6 and 9, 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 parts inside the impact tool where heat is concentrated.

[0181] As shown in Figure 9, the impact tool also includes a flow deflector 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 setting the flow deflector 80 to guide the airflow, sufficient airflow is ensured to flow upwards through the gearbox 41, thereby ensuring a cooling effect on the gearbox 41. In this embodiment, the flow deflector 80 is constructed as a cylindrical structure and is fitted around the outer periphery of the fan 33. Along the axial direction of the flow deflector 80, at least a portion of the inner wall of the flow deflector 80 is constructed in a trumpet shape, with the cross-sectional area at the upper end of the trumpet-shaped inner wall being larger than the cross-sectional area at the lower end. This configuration guides the airflow upwards.

[0182] As shown in Figures 6 and 10-12, 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 impact 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. In the embodiment shown in Figures 10-12, 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 sufficiently cooled.

[0183] 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.

[0184] In some embodiments, as shown in Figures 6 and 10, the air inlet 111 is located below the motor 30. Airflow entering through the air inlet 111 moves upwards to the motor 30 and then exits through the air outlet 112. Airflow entering through the second air inlet 115, driven by the fan 33, flows downwards through the gearbox 41 and the motor 30 before exiting 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 downwards. 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 an external device 90, which 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 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.

[0185] In some embodiments, as shown in Figures 6 and 11, 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, ensuring sufficient cooling for the motor 30, which has high cooling requirements. As shown in Figure 11, the fan 33 is located below the motor body 31, and the fan blades 334 are positioned above the baffle 333, thus 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. The second air inlet 115 is a standard opening. In other embodiments, the air inlet 111 can 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.

[0186] In some embodiments, as shown in Figures 6 and 12, 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 action of the initial airflow 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 is driven downward by the fan 33, first passing 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. As shown in Figure 12, the fan 33 is located below the motor body 31, and the fan blades 334 of the fan 33 are located on the upper side of the baffle 333, thereby better driving the airflow at the air inlet 111 and the second air inlet 115 to move downward. 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.

[0187] In some embodiments, as shown in Figures 6 and 13, 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.

[0188] As shown in Figure 13, 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.

[0189] 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 impact 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.

[0190] 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.

[0191] As shown in Figure 14, the transmission mechanism 40 of the electric hammer also includes an impact assembly 46, which is disposed within the sleeve 45. One end of the impact assembly 46 is coupled to the reciprocating motion component 44, and the other end is coupled to the working head 20, thereby realizing torque transmission between the motor 30 and the working head 20. That is, the impact assembly 46 provides axial impact force to the working head 20. In addition, a stop structure is provided on the sleeve 45 to stop the impact assembly 46 axially in front of it, thereby limiting the travel of the impact assembly 46.

[0192] In some embodiments, the impact assembly 46 includes a first impact element 461 and a second impact element 462. The working head 20, the first impact element 461, and the second impact element 462 are arranged sequentially from front to back. The impact assembly 46 has a first position and a second position, with the first position located in front of the second position. The actual operation of the electric hammer includes a working state and an unloaded state. In the working state, the user holds the first handle 51 and the second handle 52, causing the working head 20 of the electric hammer to contact the working surface. Simultaneously, the user presses the electric hammer, at which point the impact assembly 46 is in the second position (as shown in Figure 14). When the electric hammer switches from the working state to the unloaded state, the working head 20 is released from the working surface (i.e., the working head 20 no longer contacts the working surface, and the user no longer presses the electric hammer), and the impact assembly 46 moves from back to front (as shown in Figures 15-17), moving from the second position to the first position. In this embodiment, neither the first position nor the second position is a uniquely fixed position in a narrow sense; both the first position and the second position represent a range of positions.

[0193] After the working head 20 separates from the working surface, the impact component 46 moves forward axially and impacts the stop mechanism of the sleeve 45, thereby transmitting the vibration to the housing assembly 10 of the electric hammer, resulting in noticeable vibration and a poor user experience. In related technologies, a buffer such as a rubber ring is set between the impact element and the stop mechanism of the sleeve 45 to reduce vibration. However, this solution has a short damping duration, requires high fatigue strength of the buffer, is costly, and the buffer is prone to failure after long-term use, thus reducing the lifespan of the electric hammer.

[0194] In this embodiment, as shown in Figures 14-17, when the impact assembly 46 is in the first position, at least one of the first impact element 461 and the second impact element 462 forms a sealed cavity with the sleeve 45; when the impact assembly 46 is in the second position, the seal between the first impact element 461 and the second impact element 462 and the sleeve 45 is released. The working head 20 is released from the working surface. After the impact assembly 46 moves from the second position to the first position along the sleeve 45, a sealed cavity is formed between the impact assembly 46 and the sleeve 45. When the impact assembly 46 continues to move forward along the sleeve 45, it compresses the air in the sealed cavity, thereby converting the kinetic energy of the impact assembly 46 into the internal energy of the air, thus significantly reducing the impact energy between the impact assembly 46 and the sleeve 45, i.e., forming air pressure damping, which has a good damping effect, and the internal energy of the air is eventually dissipated in the form of heat. In addition, compared with the existing scheme of setting rubber rings and other buffers, not only can the damping feel be maintained for a longer time, but it is also unnecessary to set high fatigue impact resistant parts, resulting in low cost.

[0195] In some embodiments, the radius of the first impact element 461 varies with its axial position, meaning the first impact element 461 is approximately a stepped shaft-shaped component. This not only facilitates the sliding engagement of the first impact element 461 with the inner wall of the sleeve 45, thereby guiding the movement of the first impact element 461, but also facilitates its engagement with the stop structure of the sleeve 45 to limit the stroke of the first impact element 461. Similarly, the radius of the second impact element 462 varies with its axial position, meaning the second impact element 462 is a stepped shaft-shaped component. This not only facilitates the sliding engagement of the second impact element 462 with the inner wall of the sleeve 45, allowing the sleeve 45 to guide the movement of the second impact element 462, but also facilitates its engagement with the stop structure of the sleeve 45 to limit the stroke of the second impact element 462. The specific variations in the axial position of the radius of the first impact element 461 and the second impact element 462 are described below.

[0196] In some embodiments, a sealing ring is directly or indirectly installed on the inner wall of the sleeve 45. The sealing ring is used to ensure the sealing performance of the sealed cavity formed between the first impact element 461 or the second impact element 462 and the sleeve 45, thereby improving the efficiency of converting the kinetic energy of the impact hammer into the internal energy of the air, and thus improving the shock absorption effect. The specific location of the sealing ring is described below.

[0197] In some embodiments, the sleeve 45 is provided with an air outlet, and the impact assembly 46 is provided with a mating part. When the impact assembly 46 is in the first position, the mating part blocks the air outlet to form a sealed cavity, thereby achieving the effect of air pressure damping. When the impact assembly 46 is in the second position, the mating part avoids the air outlet, so that the air outlet connects the inside and outside of the sleeve 45, thereby ensuring smooth reciprocating movement of the impact assembly 46 within the sleeve 45. In this embodiment, through the cooperation between the air outlet on the sleeve 45 and the mating part on the impact assembly 46, the impact assembly 46 forms a sealed cavity by its own structure when moving from the second position to the first position, without the need for other auxiliary parts or other power sources, resulting in a simple structure. Furthermore, the formation and release of the sealed cavity directly correspond to the mechanical position of the impact assembly 46, ensuring high reliability.

[0198] In some embodiments, as shown in FIG15, the sleeve 45 includes a cylindrical body 452, and an inner stop portion 455 (which is part of the aforementioned stop structure) is provided inside the cylindrical body 452. The inner stop portion 455 is formed by protruding inward from the inner wall of the sleeve 45, and is annular in structure, forming an insertion port. The second impact element 462 is an impact hammer, which includes a hammer body 4621 and a hammer head 4622. The hammer head 4622 is connected to the front end of the hammer body 4621. The cross-sectional area of ​​the hammer body 4621 is larger than the cross-sectional area of ​​the hammer head 4622, and is also larger than the area of ​​the insertion port formed by the inner stop portion 455. The hammer body 4621 is disposed behind the inner stop portion 455 and slides against the inner wall of the cylindrical body 452. The hammer head 4622 is inserted into the insertion port formed by the inner stop portion 455. The inner stop 455 can stop the forward movement of the impact hammer, thereby limiting the stroke of the impact hammer.

[0199] As shown in Figures 14-16, the sleeve 45 includes an air hole 451 (which is part of the air outlet). When the impact hammer is in the second position (as shown in Figure 14), the hammer body 4621 of the impact hammer avoids the air hole 451, and the sleeve 45 can ventilate to the outside through the air hole 451, thereby reducing the resistance of the impact hammer's reciprocating motion within the sleeve 45. When the working head 20 is released from the working surface (as shown in Figure 16), when the impact hammer moves forward from the second position to the first position, the hammer body 4621 of the impact hammer blocks the air hole 451, forming a first sealed cavity 401 between it and the sleeve 45. Therefore, when the impact hammer continues to move forward along the sleeve 45, it will compress the air in the first sealed cavity 401, thereby converting the kinetic energy of the impact hammer into the internal energy of the air, which significantly reduces the impact energy of the impact hammer on the inner stop part 455 (i.e., the sleeve 45), forming air pressure damping, and thus significantly reducing the user's vibration.

[0200] As shown in Figures 14-16, a hammer 48 is disposed inside the sleeve 45. The hammer 48 is fixed to the front side of the inner stop 455, and a sealing ring A471 is disposed inside the hammer 48. When the impact hammer is in the first position, the hammer head 4622 of the impact hammer abuts against the sealing ring A471 inside the hammer 48. In this embodiment, the abutment between the hammer head 4622 and the sealing ring A471 means that the circumferential surface of the hammer head 4622 fits against the sealing ring A471, that is, the hammer head 4622 and the sealing ring are in an insertion relationship. Through the cooperation between the sealing ring A471 inside the hammer 48 and the hammer head 4622, the sealing performance of the first sealing cavity 401 can be improved, thereby improving the efficiency of converting the kinetic energy of the impact hammer into the internal energy of the air, and thus improving the shock absorption effect. As shown in Figure 14, when the impact hammer is in the second position, the hammer head 4622 of the impact hammer is not inserted into the chuck 48, nor does it contact the sealing ring A471. Therefore, the sealing ring A471 in the chuck 48 can be avoided from generating resistance to the impact hammer in the working state.

[0201] It should be noted that in this embodiment, the sealing ring A471 no longer bears impact force and only serves a sealing function, thus its service life can be greatly extended. Compared with the rubber buffer in the prior art, the fatigue strength performance requirements are greatly reduced, thereby reducing the manufacturing cost of the electric hammer. In this embodiment, an annular groove is provided on the inner wall of the hammer 48, and the sealing ring A471 is engaged in the annular groove on the hammer 48, thereby preventing the sealing ring A471 from shifting position. Optionally, the sealing ring A471 can be a rubber ring, and the number of sealing rings A471 can be one, two, three, or more, without specific limitation.

[0202] As shown in Figure 14, the hammer body 4621 of the impact hammer is provided with at least one annular groove, and a sealing ring D474 is provided in the annular groove of the hammer body 4621. The sealing ring D474 forms a dynamic seal with the inner wall of the cylinder 452. After the impact hammer reaches the first position, it improves the sealing performance of the first sealing cavity 401, thereby improving the efficiency of converting the kinetic energy of the impact hammer into the internal energy of the air, and thus improving the shock absorption effect. Optionally, the sealing ring D474 can be a rubber ring, and one, two, or more sealing rings D474 can be provided on the hammer body 4621. No specific limitation is made here.

[0203] As shown in Figures 16-19, the sleeve 45 also includes an end portion 453 (the end portion 453 is part of the aforementioned stop structure). The end portion 453 is located at the front end of the cylinder 452, and an opening 454 (the opening 454 is part of the aforementioned air outlet) is provided on the end portion 453. The first impact element 461 is an impact rod, which includes a main body portion 4612 and a rod portion 4613. The rod portion 4613 is connected to the front end of the main body portion 4612. The cross-sectional area of ​​the main body portion 4612 is larger than the cross-sectional area of ​​the rod portion 4613, and larger than the cross-sectional area of ​​the opening 454. The main body portion 4612 is located between the hammer 48 and the end portion 453, and is slidably engaged with the cylinder 452. The rod portion 4613 extends from the opening 454 to the outside of the sleeve 45 to facilitate coupling with the working head 20. The end portion 453 can stop the forward movement of the impact rod, thereby limiting the stroke of the impact rod.

[0204] As shown in Figures 14 and 18, the radius of the rod portion 4613 changes along the axial direction. When the impact assembly 46 is in the second position and when the impact rod has just reached the first position, a gap is formed between the rod portion 4613 and the opening 454. The sleeve 45 can ventilate through this gap, thereby reducing the resistance to the reciprocating motion of the impact rod. As shown in Figures 17-19, as the impact rod continues to move forward from the first position until it contacts the end 453, the rod portion 4613 blocks the opening 454 to form a second sealing cavity 402 between itself and the sleeve 45. The main body portion 4612 compresses the air in the second sealing cavity 402, thereby converting the kinetic energy of the impact rod into the internal energy of the air, thus significantly reducing the impact energy of the impact rod on the front end (i.e., the sleeve 45), forming air pressure damping, and thus significantly reducing the user's vibration sensation. The internal energy of the air is finally dissipated in the form of heat.

[0205] In this embodiment, as shown in Figures 18 and 19, the rod portion 4613 includes a first rod portion 4613a and a second rod portion 4613b. The main body portion 4612, the first rod portion 4613a, and the second rod portion 4613b are connected sequentially from back to front. The cross-sectional area of ​​the first rod portion 4613a is smaller than that of the main body portion 4612, and the cross-sectional area of ​​the second rod portion 4613b is smaller than that of the first rod portion 4613a. As shown in Figure 18, when the impact assembly 46 is in the second position and has just moved from the second position to the first position, the second rod portion 4613b is inserted into the opening 454. At this time, a gap that allows air to pass through is formed between the second rod portion 4613b and the inner wall of the opening 454. As shown in Figure 19, when the impact assembly 46 continues to move forward from the first position, the first rod portion 4613a is inserted into the opening 454 and seals the opening 454, thereby forming a second sealing cavity 402. In this embodiment, the first rod portion 4613a and the second rod portion 4613b are connected by an inclined surface to ensure smooth fit between the rod portion 4613 and the opening 454 on the end portion 453.

[0206] As shown in Figures 18 and 19, an annular groove is provided on the inner wall of the opening 454 on the end 453. A sealing ring C473 is installed in the annular groove. After the second rod 4613b is inserted into the opening 454, the second rod 4613b abuts against the sealing ring C473, thereby improving the sealing performance of the second sealing cavity 402, and thus improving the efficiency of converting the kinetic energy of the impact rod into the internal energy of the air, and improving the shock absorption effect. Optionally, the sealing ring C473 can be a rubber ring, and one, two or more sealing rings C473 can be installed on the end 453, which is not limited here.

[0207] As shown in Figures 18 and 19, the main body 4612 of the impact rod includes at least one annular groove 4611. A sealing ring B472 is installed in the annular groove 4611. The sealing ring B472 abuts against the inner wall of the sleeve 45, forming a dynamic seal between the main body 4612 and the inner wall of the sleeve 45. This dynamic seal improves the sealing performance of the second sealing cavity 402, thereby increasing the efficiency of converting the kinetic energy of the impact rod into the internal energy of the air and improving the shock absorption effect. Optionally, the sealing ring B472 can be a rubber ring, and one, two, or more sealing rings B472 can be installed on the main body 4612, which is not limited here.

[0208] When the working head 20 is released from the working surface, the impact assembly 46 moves from back to front (i.e., from the second position to the first position), which drives the sleeve 45 to move forward axially. As shown in Figure 17, when the sleeve 45 moves forward axially, it is limited by the buffer element 491 on the outside of the sleeve 45. The buffer element 491 can absorb the impact force of the buffer sleeve 45 on the housing assembly 10, thereby further reducing the vibration of the electric hammer. In this embodiment, a fixing member 492 is sleeved on the outside of the sleeve 45, and the buffer element 491 is annular and fixed inside the housing assembly 10. When the sleeve 45 moves forward, the fixing member 492 abuts against the buffer element 491, thereby being limited. The annular fixing member 492 and the buffer element 491 can ensure that the force is uniform when the sleeve 45 is limited, so that the user can hold the electric hammer more stably. Optionally, the buffer element 491 can be a rubber ring, a metal elastic element, etc., which is not specifically limited here.

[0209] This embodiment also provides an impact tool, which 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 transmission mechanism 40 is housed in the housing assembly 10 and coupled to both the motor 30 and the working head 20, for transmitting torque between the motor 30 and the working head 20. The transmission mechanism 40 includes a sleeve 45 extending in a front-rear direction and an impact element disposed within the sleeve 45. The impact element provides an axial impact force to the working head 20. The impact element has a first position and a second position. When the impact element is in the first position, the impact element and the sleeve 45 form a sealed cavity; when the impact element is in the second position, the seal between the impact element and the sleeve 45 is released. In this embodiment, the first position is in front of the second position, and when the working head 20 presses against the working surface, the impact element moves to the second position; when the working head 20 is released from the working surface, the impact element moves to the first position.

[0210] After the working head 20 is released from the working surface, a sealed cavity can be formed between the impact element and the sleeve 45. As the impact element continues to move along the sleeve 45, it will compress the air in the sealed cavity, thereby converting the kinetic energy of the impact element into the internal energy of the air. This significantly reduces the impact energy between the impact element and the sleeve 45, thus forming air pressure damping. The damping effect is good, and the internal energy of the air is eventually dissipated in the form of heat. In addition, compared with the existing scheme of setting rubber rings and other buffers, not only can the damping feel be maintained for a longer time, but it is also unnecessary to set high fatigue impact resistant parts, resulting in low cost.

[0211] In some embodiments, the sleeve 45 is provided with an air outlet, and the impact element is provided with a mating part. When the impact element is in the second position, the mating part avoids the air outlet, so that the air outlet connects the inside and outside of the sleeve 45, thereby reducing the resistance of the impact element's reciprocating motion within the sleeve 45. When the impact element is in the first position, the mating part blocks the air outlet to form a sealed cavity. In this embodiment, through the cooperation between the air outlet on the sleeve 45 and the mating part on the impact element, the impact assembly 46 can form or open a sealed cavity by its own structure when moving from the second position to the first position, without the need for other auxiliary parts or other power sources, resulting in a simple structure. Furthermore, the formation and release of the sealed cavity directly correspond to the mechanical position of the impact assembly 46, ensuring high reliability.

[0212] In some embodiments, a sealing ring is provided at the air outlet. The sealing ring can improve the sealing performance of the aforementioned sealing cavity, thereby increasing the efficiency of converting the kinetic energy of the impact element into the internal energy of the air and improving the shock absorption effect.

[0213] In some embodiments, the radius of the impact element varies with its axial position, meaning the first impact element 461 is approximately a stepped shaft-shaped component. This not only facilitates the sliding fit between the impact element and the inner wall of the sleeve 45, thereby allowing the sleeve 45 to guide the movement of the impact element, but also facilitates its fit with the stop structure of the sleeve 45 to limit the stroke of the impact element. The specific variation of the impact element's radius along its axial position is described below.

[0214] In some embodiments, the impact element is an impact hammer, which includes a hammer body 4621 and a hammer head 4622. The sleeve 45 includes a cylindrical body 452 and an end portion 453. The end portion 453 is located at the front end of the cylindrical body 452 and has an opening 454. The cylindrical body 452 has an air hole 451 (which is the aforementioned air outlet). The hammer head 4622 is disposed inside the cylindrical body 452 and slides within it. The hammer head 4622 extends from the opening 454 to the outside of the sleeve 45 to couple with the working head 20 of the impact hammer. When the impact hammer is in the first position, the hammer body 4621 blocks the air hole 451, forming a first sealed cavity 401 between the hammer body 4621 and the sleeve 45. As the impact element continues to move forward along the sleeve 45, it compresses the air within the sealed cavity, thereby converting the kinetic energy of the impact element into the internal energy of the air, significantly reducing the impact energy between the impact component and the sleeve 45, thus forming air pressure damping. When the impact hammer is in the second position, the hammer body 4621 avoids the air hole 451, thereby reducing the resistance of the reciprocating motion of the impact hammer.

[0215] In this embodiment, a limiting member is provided inside the sleeve 45, and a sealing ring is installed on the limiting member. When the impact hammer is in the first position, the hammer head 4622 of the impact hammer abuts against the sealing ring of the limiting member. The sealing ring can improve the sealing performance of the sealing cavity, thereby improving the efficiency of converting the kinetic energy of the impact hammer into the internal energy of the air and improving the shock absorption effect. It is understood that the limiting member can be the front end of the sleeve 45 or an additional component, which is not limited here.

[0216] In some embodiments, the impact element is an impact rod, which includes a main body 4612 and a rod portion 4613. The sleeve 45 includes a cylindrical body 452 and an end portion 453, the end portion 453 being located at the front end of the cylindrical body 452, and having an opening 454 (which is the aforementioned air outlet). The main body 4612 is slidably fitted with the cylindrical body 452, and the rod portion 4613 extends from the opening 454 to the outside of the sleeve 45 for coupling with the working head 20. The radius of the rod portion 4613 varies along its axial position. When the impact rod is in the second position, a gap is formed between the rod portion 4613 and the sidewall of the opening 454, ensuring smooth reciprocating movement of the impact rod within the cylindrical body 452; when the impact rod is in the first position, it seals the opening 454 and forms a sealed cavity with the sleeve 45.

[0217] Optionally, a sealing ring is provided on the inner wall of the opening 454. This sealing ring can improve the sealing performance of the sealing cavity, thereby improving the efficiency of converting the kinetic energy of the impact hammer into the internal energy of the air and improving the shock absorption effect.

[0218] Optionally, the main body 4612 of the impact rod includes at least one annular groove 4611, in which a sealing ring B472 is installed. The sealing ring abuts against the inner wall of the sleeve 45, thereby further improving the sealing performance of the sealing cavity and enhancing the shock absorption effect.

[0219] 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), including main housing (11); 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); A transmission mechanism (40) is at least partially housed in the main housing (11) and coupled to the motor (30) and the working head (20) respectively. The transmission mechanism (40) is used to transmit torque between the motor (30) and the working head (20). The housing assembly (10) is characterized in that it further includes a first handle mounting part (12) and a second handle mounting part (13a), which are used to mount the first handle (51) and the second handle (52) respectively; the first handle mounting part (12) is formed on the main housing (11) and is integrally formed with the main housing (11), and the second handle mounting part (13a) is a part that can be separated from the main housing (11).

2. The power tool according to claim 1, characterized in that, A first damping element (61) is sandwiched between the second handle mounting part (13a) and the transmission mechanism (40); and / or a second damping element (62) is sandwiched between the second handle mounting part (13a) and the main housing (11).

3. The power tool according to claim 2, characterized in that, The first damping element (61) is a rubber ring, and the second damping element (62) is a rubber ring.

4. The power tool according to claim 1, characterized in that, 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).

5. The power tool according to claim 1, characterized in that, The transmission mechanism (40) extends in the front-rear direction, with its rear portion housed in the main housing (11) and its front portion surrounded by the second handle mounting portion (13a).

6. The power tool according to claim 1, characterized in that, The motor (30) extends in the vertical direction, and the second handle mounting part (13a) is located in front of the motor (30).

7. The power tool according to claim 1, characterized in that, The second handle (52) is fitted onto the second handle mounting part (13a).

8. The power tool according to claim 1, characterized in that, The power tool also includes a power interface (511) which is disposed on the first handle (51).

9. The power tool according to claim 8, characterized in that, The power interface (511) is a battery pack interface for connecting the battery pack (70).

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

11. An electric hammer, comprising: Housing assembly (10), including main housing (11); 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); A transmission mechanism (40) 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 gearbox (41) being at least partially housed in the main housing (11); The housing assembly (10) is characterized in that it further includes a second housing (13b) separable from the main housing (11), and a first damping element (61) is sandwiched between the second housing (13b) and the gearbox (41).

12. The electric hammer according to claim 11, characterized in that, The second housing (13b) is a sleeve and is radially fitted onto the front of the gearbox (41).

13. The electric hammer according to claim 11, characterized in that, A second damping element (62) is sandwiched between the second housing (13b) and the main housing (11).

14. The electric hammer according to claim 11, characterized in that, The electric hammer also includes a first handle (51), and the main housing (11) 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).

15. The electric hammer according to claim 14, characterized in that, 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). The connecting rod (14) supports the tensile force, and the spring (15) supports the compressive force.

16. The electric hammer according to claim 14, characterized in that, The lower end of the first handle (51) is pivotally connected to the lower end mounting point (122).

17. The electric hammer according to claim 14, characterized in that, The first handle (51) is provided with a battery pack interface for connecting the battery pack (70).

18. The electric hammer according to claim 11, characterized in that, The electric hammer also includes a second handle (52), which is selectively installed and can be fitted onto the second housing (13b).

19. 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 device is characterized in that the housing assembly (10) is provided with an air inlet (111) and a connecting part (16), 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); wherein the connecting part (16) includes a movable member (161), and an opener (17) linked with the movable member (161) is provided at the air inlet (111). When the external device (90) is coupled to the connecting part (16), the movable member (161) is displaced, causing the opener (17) to rotate, thereby exposing the air inlet (111).

20. The power tool according to claim 19, characterized in that, The connecting part (16) also includes a slot (162), which can compress the moving part (161) to move when the external device (90) is inserted into the slot (162).

21. The power tool according to claim 20, characterized in that, The movable element (161) is a push rod, the first end of which can extend into or out of the slot (162).

22. The power tool according to claim 21, characterized in that, The opener (17) includes a baffle (171), and the push rod is displaced under the pressure of the external device (90), which causes the baffle (171) to rotate and expose the air inlet (111).

23. The power tool according to claim 19, characterized in that, The housing assembly (10) includes a main housing (11), and the power tool also includes an elastic element (18) abutting between 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) to return to its original position, thereby causing the opener (17) to rotate and block the air inlet (111).

24. The power tool according to claim 19, characterized in that, The motor shaft (32) of the motor (30) extends in the vertical direction, and the air inlet (111) is located below the motor (30).

25. The power tool according to claim 24, characterized in that, After the airflow enters the housing assembly (10) through the air inlet (111), it passes through the motor (30) along the motor shaft (32).

26. The power tool according to claim 19, characterized in that, The air inlet (111) is located above the joint (16).

27. The power tool according to claim 19, characterized in that, The power tool in question is an electric hammer.

28. The power tool according to claim 19, characterized in that, The external device (90) is a vacuum cleaner, and the airflow outlet of the vacuum cleaner is opposite to the air inlet (111).

29. 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).

30. The power tool according to claim 29, 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).

31. The power tool according to claim 30, characterized in that, The air outlet (112) is located near the edge of the fan blades of the fan (33).

32. The power tool according to claim 29, 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).

33. The power tool according to claim 32, 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).

34. The power tool according to claim 30, 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).

35. The power tool according to claim 34, 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).

36. The power tool according to claim 34, 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).

37. The power tool according to claim 29, 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.

38. The power tool according to claim 29, characterized in that, The power tool in question is an electric hammer.

39. 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.

40. The power tool according to claim 39, 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).

41. The power tool according to claim 40, 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).

42. The power tool according to claim 39, characterized in that, The housing assembly (10) is also provided with a second air inlet (115), which is located on the top of the housing assembly (10).

43. The power tool according to claim 39, characterized in that, The air inlet (111) is located below the motor (30).

44. The power tool according to claim 39, 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 air inlet (111) is located below the gearbox (41) and above the motor (30).

45. The power tool according to claim 44, characterized in that, The air inlet (111) is positioned opposite to the gearbox (41).

46. ​​The power tool according to claim 39, characterized in that, The air outlet (112) is located near the edge of the fan blade.

47. The power tool according to claim 39, 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.

48. The power tool according to claim 39, characterized in that, The power tool in question is an electric hammer.

49. 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).

50. The power tool according to claim 49, characterized in that, The housing assembly (10) includes an air outlet (112), from which both the first air passage and the second air passage are discharged.

51. The power tool according to claim 49, characterized in that, The air inlet (111) is used to connect to an external device (90), and the second air inlet (115) is a normal opening.

52. The power tool according to claim 49, characterized in that, The air inlet (111) is located below the motor (30).

53. The power tool according to claim 49, characterized in that, The second air inlet (115) is located above the gearbox (41).

54. The power tool according to claim 49, characterized in that, The first set of fan blades (331) and the second set of fan blades (332) are arranged back to back.

55. The power tool according to claim 49, characterized in that, The power tool also includes an opener (17) that can selectively block or expose the air inlet (111).

56. The power tool according to claim 55, characterized in that, The power tool also includes a coupling part (16) for coupling an external device (90). When the external device (90) is coupled to the coupling part (16), the coupling part (16) drives the opening and closing device (17) to rotate, exposing the air inlet (111).

57. The power tool according to claim 56, characterized in that, The connecting part (16) includes a movable part (161), and the opening and closing device (17) is linked with the movable part (161). When the external device (90) is coupled with the connecting part (16), the movable part (161) is displaced, causing the opening and closing device (17) to rotate and expose the air inlet (111).

58. The power tool according to claim 57, characterized in that, The connecting part (16) further includes a slot (162), the movable member (161) being at least partially able to extend into the slot (162), and the external device (90) being able to press the movable member (161) to move when inserted into the slot (162).

59. An electric hammer, 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); 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) includes a sleeve (45) extending in the front-rear direction and an impact assembly (46) disposed in the sleeve (45). The impact assembly (46) includes a first impact element (461) and a second impact element (462). The working head (20), the first impact element (461), and the second impact element (462) are arranged sequentially from front to back. The impact assembly (46) is characterized in that it has a first position and a second position. When the impact assembly (46) is in the first position, at least one of the first impact element (461) and the second impact element (462) forms a sealed cavity with the sleeve (45); when the impact assembly (46) is in the second position, the seal between the first impact element (461) and the second impact element (462) and the sleeve (45) is released.

60. The electric hammer according to claim 59, characterized in that, The first position is in front of the second position.

61. The electric hammer according to claim 59, characterized in that, When the working head (20) presses against the working surface, the impact component (46) moves to the second position; when the working head (20) is released from the working surface, the impact component (46) moves to the first position.

62. The electric hammer according to claim 59, characterized in that, The radius of the first impact element (461) varies with the axial position; the radius of the second impact element (462) varies with the axial position.

63. The electric hammer according to claim 59, characterized in that, The inner wall of the sleeve (45) is directly or indirectly fitted with a sealing ring.

64. The electric hammer according to claim 59, characterized in that, The second impact element (462) is an impact hammer, and the sleeve (45) includes an air hole (451). When the impact hammer is in the first position, the hammer body (4621) of the impact hammer blocks the air hole (451) and forms a first sealing cavity (401) between it and the sleeve (45).

65. The electric hammer according to claim 64, characterized in that, The sleeve (45) is provided with a hammer (48), and the hammer (48) is provided with a sealing ring A (471). When the impact hammer is in the first position, the hammer head (4622) of the impact hammer abuts against the sealing ring A (471) inside the hammer (48).

66. The electric hammer according to claim 59, characterized in that, The first impact element (461) is an impact rod, which includes at least one annular groove (4611), in which a sealing ring B (472) is installed, and the sealing ring B (472) abuts against the inner wall of the sleeve (45).

67. The electric hammer according to claim 59, characterized in that, The sleeve (45) is axially movable, and when the sleeve (45) moves forward along the axial direction, it is limited by the buffer element (491) on the outside of the sleeve (45).

68. The electric hammer according to claim 59, characterized in that, When the working head (20) is released from the working face, the sleeve (45) moves forward.

69. An impact 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); 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) includes a sleeve (45) extending in the front-rear direction and an impact element disposed in the sleeve (45), the impact element providing an axial impact force to the working head (20). The impact element is characterized in that it has a first position and a second position. When the impact element is in the first position, the impact element and the sleeve (45) form a sealed cavity; when the impact element is in the second position, the seal between the impact element and the sleeve (45) is released.

70. The impact tool according to claim 69, characterized in that, The sleeve (45) is provided with an air outlet, and the impact element is provided with a mating part. When the impact element is in the first position, the mating part blocks the air outlet to form the sealing cavity; when the impact element is in the second position, the mating part avoids the air outlet so that the air outlet connects the inside and outside of the sleeve (45).

71. The impact tool according to claim 70, characterized in that, A sealing ring is provided at the air outlet.

72. The impact tool according to claim 69, characterized in that, The first position is in front of the second position.

73. The impact tool according to claim 69, characterized in that, When the working head (20) presses against the working surface, the impact element moves to the second position; when the working head (20) is released from the working surface, the impact element moves to the first position.

74. The impact tool according to claim 69, characterized in that, The radius of the impact element varies with its axial position.

75. The impact tool according to claim 69, characterized in that, The inner wall of the sleeve (45) is directly or indirectly fitted with a sealing ring. When the impact element is in the first position, the impact element abuts against the sealing ring.

76. The impact tool according to claim 69, characterized in that, The impact element is an impact hammer, and the sleeve (45) includes an air hole (451). When the impact hammer is in the first position, the hammer body (4621) of the impact hammer blocks the air hole (451) and forms the sealing cavity between it and the sleeve (45).

77. The impact tool according to claim 76, characterized in that, The sleeve (45) is provided with a limiting member, and a sealing ring is installed on the limiting member. When the impact hammer is in the first position, the hammer head (4622) of the impact hammer abuts against the sealing ring of the limiting member.

78. The impact tool according to claim 69, characterized in that, The impact element is an impact rod, which includes at least one annular groove (4611) and a sealing ring is installed in the annular groove (4611). The sealing ring abuts against the inner wall of the sleeve (45).

79. The impact tool according to claim 69, characterized in that, The sleeve (45) includes a cylindrical body (452) and an end portion (453) located at the front end of the cylindrical body (452), the end portion (453) being provided with an opening (454); The impact element includes a main body (4612) and a rod (4613). The main body (4612) is disposed inside the sleeve (45). The rod (4613) extends from the opening (454) to the outside of the sleeve (45). The radius of the rod (4613) changes along the axial position to block the opening (454) at the first position and form the sealing cavity between the rod (4613) and the sleeve (45).

80. The impact tool according to claim 69, characterized in that, The sleeve (45) is axially movable, and when the sleeve (45) moves forward along the axial direction, it is limited by the buffer element (491) on the outside of the sleeve (45).

81. The impact tool according to claim 69, characterized in that, When the working head (20) is released from the working face, the sleeve (45) moves forward.

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