Handheld power tool

Abstract

The invention discloses a handheld power tool which comprises an output shaft, an output shaft, an output shaft, an output shaft and an output shaft, wherein the output shaft comprises an output axis limited by the output shaft; the transmission mechanism is provided with a transmission shaft; the output transmission assembly is arranged between the transmission shaft and the output shaft; the output transmission assembly comprises an input part connected with the transmission shaft and an output part connected with the output shaft; the output part comprises a first transmission wheel and a second transmission wheel, and the output shaft is selectively coupled with the first transmission wheel or the second transmission wheel so as to transmit power of the transmission shaft to the output shaft. The handheld power tool is high in working efficiency.

Description

Technical Field

[0001] The present application relates to the field of power tools, and more particularly to a handheld power tool. Background Art

[0002] In the related art, handheld power tools are widely used in life due to their convenience and high output efficiency. In the working conditions, situations where there are obstacles on one side are often encountered, such as the connection position between a wall and a floor, the interior position of a cabinet, or other working conditions that require an offset output shaft. In the related art, in handheld power tools, especially in fastening tools, the output shaft is basically located at a relatively central position of the machine to ensure the stability of the torque output process. However, when encountering working conditions that require working along the edge, the machine needs to be tilted for operation, which easily leads to the scrapping of fasteners and damage to workpieces.

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

[0004] An object of the present application is to solve or at least mitigate some or all of the above problems. To this end, an object of the present application is to provide a handheld power tool that can achieve an offset output shaft without disassembling and assembling accessories.

[0005] To achieve the above object, the present application adopts the following technical solutions: A handheld power tool, comprising: a motor including a drive shaft that rotates about a first axis; a drive housing for at least receiving the motor; an output shaft including an output axis defined by itself, the output shaft rotates about the output axis to output power; a transmission mechanism for connecting the drive shaft, the transmission mechanism configuring a transmission shaft; an output transmission assembly disposed between the transmission shaft and the output shaft; the output transmission assembly includes an input portion connected to the transmission shaft and an output portion connected to the output shaft; the output portion includes a first transmission wheel and a second transmission wheel, and the output shaft can selectively be coupled with the first transmission wheel or the second transmission wheel to transmit the power of the transmission shaft to the output shaft.

[0006] In some embodiments, it further includes an output housing for supporting the rotation of the output shaft, the output housing is configured with a first central axis passing through the geometric center; the output shaft includes: a first position where the radial distance between the output axis and the first central axis is D1 and a second position where the radial distance between the output axis and the first central axis is D2.

[0007] In some embodiments, when the output shaft is in the first position, the output shaft is coupled with the first transmission wheel.

[0008] In some embodiments, the axes of the first transmission wheel and the second transmission wheel are substantially parallel, and the rotation directions of the first transmission wheel and the second transmission wheel are the same.

[0009] In some embodiments, the output part further includes a third transmission wheel, and the third transmission wheel is respectively in transmission connection with the first transmission wheel and the second transmission wheel.

[0010] In some embodiments, a clamping part for connecting a working part is formed or connected to the output shaft, and the working part is configured to realize the functions of a hand-held power tool.

[0011] In some embodiments, a first bearing for supporting the output shaft to rotate around the output axis is further included, and the output housing is provided with a receiving part for receiving the first bearing.

[0012] In some embodiments, the output housing rotates relative to the drive housing around a first central axis.

[0013] In some embodiments, the output shaft rotates relative to the output housing around a third axis, and the third axis is eccentrically arranged with respect to the first central axis.

[0014] In some embodiments, the axis of at least one of the first transmission wheel and the second transmission wheel is offset from the first central axis. When the output housing rotates relative to the drive housing around the first central axis, the offset transmission wheel rotates relative to the drive housing around the first central axis.

[0015] The advantages of the present application are as follows: The output transmission assembly connects the transmission shaft and the output shaft, and includes a first transmission shaft and a second transmission shaft. By setting the output shaft, it can be selectively coupled with the first transmission wheel or the second transmission wheel, so that the output shaft can realize the offset function, and setting the connection state can ensure the power transmission path after the output shaft undergoes radial displacement, ensuring the use function of the hand-held power tool. The switching between two states can be realized and used, and the switching is convenient, thereby improving work efficiency. There is no need to carry additional accessories, improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural diagram of an embodiment in the present application, wherein the hand-held power tool is in the first state; Figure 2 is a structural diagram of another perspective of an embodiment in the present application, wherein the output shaft is in the first position; Figure 3 is a structural diagram of an embodiment in the present application, wherein the output shaft is in the second position; Figure 4 is a structural diagram of another perspective of an embodiment in the present application, wherein the hand-held power tool is in the second state; Figures 5A - 5C is a schematic structural diagram when the output shaft is in the second position in an embodiment of the present application; Figure 6 is Figure 4Structural diagram from another perspective; Figure 7 is Figure 2 the sectional view taken along A-A in; Figure 8 is a partial structural diagram of the internal structure of an embodiment in the present application; Figure 9 is Figure 8 a schematic diagram of a half-sectional view of; Figure 10 is an exploded view of a partial structure of an embodiment in the present application, wherein the output shaft is in the first position; Figure 11 is an exploded view of a partial structure of an embodiment in the present application, wherein the output shaft is in the second position; Figure 12 is a sectional view of the clamping portion of an embodiment in the present application. Detailed implementation manners

[0017] Before explaining any embodiment of the present application in detail, it should be understood that the present application is not limited to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0018] In the present application, the terms "comprise", "include", "have" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element.

[0019] In the present application, the term "and / or" is a relationship description of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "and / or" relationship between the associated objects before and after.

[0020] In the present application, the terms "connect", "combine", "couple", "mount" may be direct connection, combination, coupling or mounting, or may be indirect connection, combination, coupling or mounting. Among them, by way of example, direct connection means that two parts or components are connected together without the need for an intermediate member, and indirect connection means that two parts or components are respectively connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. In addition, "connect" and "couple" are not limited to physical or mechanical connection or coupling, and may include electrical connection or coupling.

[0021] In this application, those of ordinary skill in the art will understand that relative terms used in connection with quantities or conditions (such as "about", "approximately", "substantially", etc.) are intended to include the stated value 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 caused by manufacturing, assembly, use, etc. associated with a particular value. Such terms should also be considered to disclose a range defined by the absolute values of two endpoints. The relative term may refer to a plus or minus a certain percentage (such as 1%, 5%, 10% or more) of the indicated value. Numerical values without the use of relative terms should also be disclosed as specific values with tolerances. In addition, "substantially" when expressing a relative angular positional relationship (such as substantially parallel, substantially perpendicular) may refer to a plus or minus a certain number of degrees (such as 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0022] In this application, those of ordinary skill in the art will understand that the functions performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0023] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", "rear", etc. are described based on the orientation and positional relationship shown in the drawings, and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element. It should also be understood that orientation terms such as the upper side, lower side, left side, right side, front side, rear side, etc. not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, lower front, and lower rear, etc.

[0024] As Figure 1 shown, a hand-held power tool. In this embodiment, the hand-held power tool is a drill 100. In some embodiments, it can also be other hand-held tools, such as an impact wrench, an impact screwdriver, a screwdriver, an impact drill, a rotary hammer, an angle grinder, or an angle tool. In some embodiments, the hand-held power tool is a tool that realizes the power tool through rotational output. In some embodiments, the hand-held power tool is a tool that realizes the fastening or loosening of fasteners through rotational output.

[0025] As Figure 1As shown, take the electric drill 100 as an example. The electric drill 100 includes a power supply 30. Among them, in this embodiment, the power supply 30 is a DC power supply. The DC power supply is used to provide electrical energy for the electric drill 100. The DC power supply is a battery pack, and the battery pack cooperates with the corresponding power circuit to supply power to the electric drill 100. Those skilled in the art should understand that the power supply is not limited to the scenario of using a DC power supply, and can also supply power to the corresponding components inside the machine through the mains power, AC power, and cooperate with the corresponding rectification, filtering, and voltage regulation circuits. In the following description, the battery pack 30 will be used to replace the power supply, but it should not be regarded as a limitation to the present invention.

[0026] As Figures 1 to 9 As shown, the electric drill 100 includes a housing 11, a motor 12, an output assembly 13, and a transmission mechanism 14. Among them, the motor 12 includes a drive shaft 121 that rotates about the first axis 101. In this embodiment, the motor 12 is specifically set as an electric motor, and the electric motor 12 will be used to replace the motor in the following text, but it should not be regarded as a limitation to this application. In this embodiment, the electric motor 12 includes a stator assembly 122 and a rotor assembly 123. The rotor assembly 123 forms or is connected to a drive shaft 121 that rotates about the first axis 101. In this embodiment, the electric motor 12 is an inner rotor brushless motor. In other alternative embodiments, the electric motor 12 is an outer rotor brushless motor. For the inner rotor motor, the stator assembly 122 is sleeved outside the rotor assembly 123. For the outer rotor motor, the rotor assembly 123 is sleeved outside the stator assembly 122. In this embodiment, the brushless motor is set as a three-phase brushless motor. It can be understood that the electric motor is not limited to a three-phase brushless motor, and can also be other types of DC motors, which does not affect the substantial content of this application.

[0027] As Figure 1 As shown, the housing 11 includes a drive housing 111 for accommodating the motor and a second housing 112 for accommodating at least part of the output assembly 13. The second housing 112 is connected to the front end of the drive housing 111. In this embodiment, the housing 11 also forms or is connected to a grip portion 114 for the user to operate, which is convenient for the user to hold and operate. One end of the grip portion 114 is connected to the battery pack 30.

[0028] The output assembly 13 is used to drive the working accessory to realize the function of a handheld power tool. In this embodiment, the output assembly 13 includes an output shaft 131. The output shaft 131 is used to output power, and the output shaft 131 rotates about the output axis 104. A clamping portion 132 is provided at the front end of the output shaft 131, which can clamp the corresponding working accessory, such as a drill bit, a screwdriver, a socket, etc. when realizing different functions. Optionally, the clamping portion 132 is a quick-release clamping component. As Figure 12As shown, in some embodiments, when the handheld power tool is another type of drill, the clamping portion 132' at the front end of the output shaft 131 is a multi-jaw clamping chuck structure. For those skilled in the art, both the clamping portion 132 and the clamping portion 132' belong to traditional related structures in nature. Therefore, in this application, for the purpose of simplicity of the specification, detailed descriptions are omitted and no specific limitations are made.

[0029] As Figures 7 to 9 shown, a transmission mechanism 14 is connected between the output assembly 13 and the motor 12. For example, tools with high-speed and high-torque output such as screwdriver types and drill types. The transmission mechanism 14 is used to connect the drive shaft 121 and the output shaft 131. The transmission mechanism 14 is configured with a transmission shaft 141 that defines a second axis 102 by itself, and the transmission shaft 141 is connected to the output shaft 131. In this embodiment, the transmission mechanism 14 is a reduction gear system. Optionally, the transmission mechanism 14 includes a planetary gear set 142 for speed reduction, and the number of planetary gear sets 142 can be one stage or multiple stages. The planetary gear set 142 converts the output speed of the motor 12 according to a certain transmission ratio to achieve an appropriate torque. In this embodiment, a sun gear is formed or connected on the drive shaft 121, and the planetary gear meshes with the sun gear. The transmission shaft 141 is configured on the planet carrier closest to the output shaft 131. It can be understood that the transmission shaft 141 is the torque output end of the transmission mechanism 14, and the torque or speed on the transmission shaft 141 is the final torque or speed after the drive shaft 121 undergoes the deceleration and torque increase process of the transmission mechanism 14.

[0030] In some alternative embodiments, the transmission mechanism 14 further includes an impact assembly that applies an impact force to the output shaft 131, such as an impact wrench, an impact drill, or a hammer drill, etc. Optionally, the transmission shaft 141 is the impact force output shaft of the impact assembly at this time, that is, the transmission shaft 141 is the impact force output end of the transmission mechanism 14.

[0031] In this embodiment, the first axis 101 coincides with the second axis 102. In other alternative embodiments, the second axis 102 is arranged at a certain angle with the first axis 101. In other alternative embodiments, the second axis 102 is parallel to but does not coincide with the output axis 104.

[0032] The transmission mechanism 14 further includes a shift component 143 to achieve multi-gear output through multiple groups of gears with different transmission ratios. Since the working principle of planetary gear reduction and the deceleration generated by this transmission mechanism 14 have been fully disclosed to those skilled in the art, detailed descriptions are omitted here for the purpose of simplicity of the specification.

[0033] The shift assembly 143 includes a speed dial 1431 , which is disposed on the drive housing 111 or the second housing 112 . Turning the speed dial 1431 can realize multi-speed output through multiple sets of gears with different transmission ratios.

[0034] like Figures 1 to 7 As shown, the electric drill 100 also includes a main switch 161 and a switching unit 163. Among them, the main switch 161 is a trigger switch. The trigger switch is arranged on the gripping portion 114 for user operation. The rotation speed of the motor 12 is adjusted according to the trigger stroke of the trigger switch. In this embodiment, the trigger switch is coupled with the sliding rheostat 162, and the trigger stroke of the trigger switch is different, and the analog signal output by the sliding rheostat 162 is different. The trigger stroke of the trigger switch is positively correlated with the duty cycle of the PWM signal of the motor 12, and the duty cycle of the PWM signal is positively correlated with the rotation speed of the motor 12. When the trigger stroke of the trigger switch is small, the duty cycle of the PWM signal is also small, and at this time, the rotation speed of the motor 12 is also small. In some embodiments, the impact wrench stores a mapping relationship between the trigger stroke of the trigger switch and the PWM signal, and the mapping relationship can be linear, or, it can also be nonlinear, and the embodiment of the present application does not limit this.

[0035] The switch portion 163 is provided on the upper side of the trigger switch, and is configured to be operated to set the rotation direction of the motor to a forward rotation direction for tightening the fastener or a reverse rotation direction for loosening the fastener.

[0036] In this embodiment, the second housing 112 includes an output housing 113 for supporting the rotation of the output shaft 131. Figures 7 to 9 As shown, the output housing 113 is provided with a receiving portion 1131. The output shaft 131 is provided with a first bearing 115 for supporting the output shaft 131 to rotate around the output axis 104. The receiving portion 1131 is used to install the first bearing 115. Optionally, the first bearing 115 is a ball bearing, and the inner ring of the ball bearing is connected to the output shaft 131. It can be understood that when the motor 12 starts to output power through the drive shaft 121, the output shaft 131 rotates around the output axis 104 relative to the output housing 113 to operate the fastener. Optionally, the first bearing 115 also includes a sliding bearing, such as an oil-containing bearing. In some embodiments, as Figure 12 As shown, for example, in a drill, the clamping portion 132 ′ is also provided with a clamping portion housing 1321 ′. In this embodiment, the housing of the clamping portion 132 ′ does not belong to the output housing 113 .

[0037] like Figures 1 to 2 As shown, the electric drill 100 includes: a first state in which the output axis 104 is substantially coaxial with the second axis 102 and, as shown in FIG. Figure 3As shown in FIGS. 1 to 5, a second state in which the output axis 104 is radially offset from the second axis 102. Among them, as Figures 1 to 2 shown, the first state can be understood as a "central" state of an output shaft 131, which is the operating condition of an ordinary fastening type handheld power tool. As Figure 3 shown in FIGS. 1 to 5, the second state can be understood as a "side-edge" state in which the output shaft 131 is offset.

[0038] As Figures 1 to 4 shown, the output shaft 131 moves relative to the output housing 113 so that the output shaft 131 is radially offset relative to the first central axis 105. It can be understood that each movement of the output shaft 131 relative to the output housing 113 is configured with a stop point, and each stop point is radially offset along the first central axis 105 relative to another stop point. By the relative movement of the output shaft 131 relative to the output housing 113, the electric drill 100 is enabled to achieve the first state and the second state. In the related art, for a handheld fastening tool that can achieve the side-edge function with the output shaft 131 offset, generally when implementing the side-edge function, an accessory is additionally installed on the output shaft 131, and the output shaft of the accessory is eccentrically arranged with the output shaft 131 of the machine, that is, the output axis of the accessory is radially offset from the output axis 104 of the machine. When the working condition of the output shaft 131 being offset to the side-edge is required, the accessory is installed on the machine. Such a structure requires the user to carry the accessory additionally during work, and also requires the working accessory (such as a bit) to be disassembled and assembled on the accessory and the machine body multiple times during use to adapt to the side-edge working condition and the non-side-edge working condition, which is not conducive to work efficiency.

[0039] In this embodiment, the output shaft 131 moves radially relative to the output housing 113 along the first central axis 105, that is, the output shaft 131 includes: as Figure 2 shown in the first position and as Figure 4 shown in the second position. When in the first position, the radial distance between the output axis 104 and the first central axis 105 is D1. When in the second position, the radial distance between the output axis 104 and the first central axis 105 is D2. Among them, D1 is less than D2. When the radial distance between the first central axis 105 and the outer edge of the output housing 113 is defined as R, D1 is greater than or equal to 0 and less than R, and D2 is greater than 0 and less than or equal to R. Therefore, when the output shaft 131 is in the first position, the electric drill 100 is in one of the first state or the first states. When the output shaft 131 is in the second position, the electric drill 100 is in one of the second state or the second states.

[0040] According to the above definition of the output housing 113, the output housing 113 is used to support the rotation of the output shaft 131. In this embodiment, the output housing 113 houses the first bearing 115. Optionally, the projection of the output housing 113 in the front-rear direction is substantially circular or quasi-circular, and the output housing 113 is configured with a first central axis 105 passing through the geometric center. Optionally, the geometric center is the center of the output housing 113, and the first central axis 105 is the central axis of the output housing 113. As Figure 2 , Figure 4 and Figure 6 shown, the radial distance between the first central axis 105 and the outer edge of the output housing 113 is R, and R is the radius of the output housing 113 or the radius of the projection plane of the output housing 113 in the front-rear direction. In some alternative embodiments, the output housing 113 is a polygon, and the first central axis is a straight line extending in the front-rear direction after passing through the geometric center. If the radial distance between the first central axis 105 and the outer edge of the output housing 113 is R, then R is not necessarily a fixed value. The above does not affect the essence of this application.

[0041] By providing an output shaft 131 that can move radially relative to the output housing 113, it is possible to achieve both a conventional central form and an offset form with the output shaft 131 offset relative to the center without using additional accessories. The user can switch between the two states and use them only by adjusting the position of the output shaft 131, which is convenient for switching and thus improves work efficiency. There is no need to carry additional accessories, which improves the user experience.

[0042] With an output shaft 131 that can move relative to the output housing 113 or radially displace relative to the first central axis 105, the output shaft 131 can be adjusted relative to the first central axis 105 more flexibly within the range of 0 to R.

[0043] In some alternative embodiments, the first position and the second position of the output shaft 131 correspond to two different offset edge-attaching states of the output shaft 131. At this time, it can be understood that when the output shaft 131 is in the first position and the second position, the electric drill 100 is in the second state. For such an embodiment, the output shaft 131 can be the accessory output shaft of an accessory product, and the output housing 113 is the housing of the accessory product, so that a single accessory product can achieve multiple offset edge-attaching dimensions and be applied to multiple edge-attaching working conditions. The output shaft can be adjusted relative to the first central axis 105 more flexibly within the range of 0 to R. Therefore, when the first position and the second position of the output shaft 131 correspond to two different edge-attaching states, it is also applicable to products with accessories and can also improve work efficiency.

[0044] In this embodiment, the first central axis 105 coincides with the second axis 102. In other alternative embodiments, the first central axis 105 and the second axis 102 are parallel to each other but do not coincide. In other alternative embodiments, the first central axis 105 and the second axis 102 are arranged at a certain angle.

[0045] Optionally, the output shaft 131 rotates relative to the output housing 113 about the third axis 103. That is, the output shaft 131 realizes the switching between the first position (such as Figure 1 ) and the second position (such as Figure 3 ) by rotating about the third axis 103. Among them, the third axis 103 is parallel to the first central axis 105 but offset. Optionally, the third axis 103 is arranged between the first position where the output shaft 131 is located and the second position where the output shaft 131 is located. Of course, in other alternative embodiments, the switching between the first position and the second position can be realized by radial translational motion or rotational motion relative to other reference axes.

[0046] Such as Figures 1 to 2 shown, when the output axis 104 is in a first state that is substantially coaxial with the second axis 102, the radial distances of the output axis 104 from the outer edges on both sides of the output housing 113 in the same radial direction are L1 and L2 respectively. Among them, the ratio of L1 / L2 is greater than or equal to 0.4 and less than or equal to 1. In some embodiments, the ratio of L1 / L2 is greater than or equal to 0.5 and less than or equal to 1. In some embodiments, the ratio of L1 / L2 is greater than or equal to 0.6 and less than or equal to 1. In some embodiments, the ratio of L1 / L2 is greater than or equal to 0.7 and less than or equal to 1. In some embodiments, the ratio of L1 / L2 is greater than or equal to 0.8 and less than or equal to 1. Among them, L1 is less than or equal to L2. In the embodiment of the present application, when the electric drill 100 is in the first state, the position of the output shaft 131 is substantially the same as that of a conventional electric drill or a tool for rotating and outputting torque. That is, when the electric drill 100 is in the first state, the electric drill 100 can maintain the usage habit and appearance state of a conventional screwdriver. Since the output shaft 131 of a conventional electric drill (i.e., an electric drill 100 without a side-attaching function) is substantially located at the center of the output housing 113, that is, when the output axis 104 is in the first state that is substantially coaxial with the second axis 102, the output axis 104 is substantially coaxial with the first central axis 105. It can be understood that when the output shaft 131 is in the first position, D1 is substantially 0. It can be understood that for some conventional electric drills, the ratio of the radial distances of the output axis of the output shaft from the outer edges on both sides of the output housing in the same radial direction, that is, L1 / L2, is not equal to 1 or is not substantially coaxial. For such electric drill products, when the output shaft with an output shaft offset function is in the first position, L1 / L2 is not equal to 1. For example, the ratio of L1 / L2 is greater than or equal to 0.4 and less than 1.

[0047] In this embodiment, the output shaft 131 that can move relative to the output housing 113 is used to enable the output shaft 131 to be offset relative to the first central axis 105 of the output housing 113 and also to return to the center of the output housing 113 or a position relatively close to the center. On the one hand, the appearance and usage habits of a conventional screwdriver in the related art can be maintained. On the other hand, the wobbling of the output shaft 131 in the first state can be reduced.

[0048] In this embodiment, when the electric drill 100 is in the second state, according to the above, the output shaft 131 is radially displaced relative to the output housing 113 about the third axis 103 to the second position.

[0049] As Figures 4 to 5A shown in FIG. -5C, to achieve the multi-directional offset of the electric drill 100, in this embodiment, when the output shaft 131 is in the second position, the output shaft 131 rotates relative to the drive housing 111 about the first central axis 105. So that the output shaft 131 can complete the offset in multiple directions. Optionally, the output housing 113 rotates relative to the drive housing 111 about the first central axis 105, and the output shaft 131 rotates synchronously with the output housing 113. Optionally, the output housing 113 can partially rotate about the first central axis 105 to drive the output shaft 131 to rotate synchronously. In this embodiment, since the output housing 113 can rotate about the first central axis 105, when the output shaft 131 is in the first position, the output shaft 131 can also be driven by the output housing 113 to rotate about the first central axis 105. In this embodiment, the second housing 112 and the output housing 113 do not move relative to each other, that is, the second housing 112 and the output housing 113 rotate synchronously. Optionally, the second housing 112 rotates relative to the drive housing 111 about the first central axis 105, and the output shaft 131 rotates synchronously with the second housing 112. Optionally, the second housing 112 can partially rotate about the first central axis 105 to drive the output shaft 131 to rotate synchronously. It should be explained that in this embodiment, the second housing 112 and the output housing 113 rotate synchronously or are integrally formed, but due to the requirements of the appearance shape or other functional requirements, the geometric centers of the output housing and the second housing are not the same. In some embodiments, the shapes of the second housing 112 and the output housing 113 are the same, so their geometric centers can be the same. In some embodiments, the hand-held power tool may further include a structure for rotating and adjusting the torque or output speed, but since the rotation of such components does not change the relative position of the output axis relative to the second axis, such rotating components do not belong to the second housing part.

[0050] Since the output shaft 131 needs to be stably connected and driven when working, i.e., when outputting power, the electric drill 100 further includes a first locking portion 151 for holding the output shaft 131 in a first position or a second position, and a second locking assembly 19 for selectively locking the rotation of the output housing 113 relative to the drive housing 111. The specific structures of the first locking portion 151 and the second locking assembly 19 will be specifically introduced below.

[0051] As Figures 7 to 11 shown, the electric drill 100 further includes a clutch assembly 15 disposed between the drive shaft 141 and the output shaft 131. The clutch assembly 15 includes: a connected state in which torque is transmitted between the drive shaft 141 and the output shaft 131, and a disengaged state in which the drive shaft 141 and the output shaft 131 are disengaged from transmission. When the clutch assembly 15 is in the disengaged state, the output shaft 131 is allowed to move in a direction perpendicular to the first axis 101. Optionally, when the clutch assembly 15 is in the disengaged state, the output shaft 131 is allowed to move radially relative to the output housing 113. The clutch assembly 15 is used to achieve the switching of the output shaft 131 between the first position and the second position, and the power transmission from the motor to the output shaft 131 can be achieved at the first position and the second position respectively after the switching. Among them, as Figure 9 and Figure 11 shown, the output shaft is in the second position, as Figure 10 shown, the output shaft is in the first position.

[0052] By providing the clutch assembly 15 with a disengaged state, the output shaft 131 can achieve radial displacement and thus achieve the biasing function, while setting the connected state can ensure the power transmission path after the output shaft 131 undergoes radial displacement, ensuring the use function of the electric drill 100.

[0053] The electric drill 100 further includes an output transmission assembly 18 disposed between the drive shaft 141 and the output shaft 131. As Figure 10 shown, the output transmission assembly 18 includes an input portion 18a connected to the drive shaft 141 and an output portion 18b connected to the output shaft 131. As Figure 10 and Figure 11 shown, the output portion 18b includes a first transmission wheel 181 and a second transmission wheel 182. The output shaft 131 can be selectively coupled with the first transmission wheel 181 or the second transmission wheel 182 to transmit the power of the drive shaft 141 to the output shaft 131. By providing that the output shaft 131 can be selectively coupled with the first transmission wheel 181 or the second transmission wheel 182, the output shaft 131 can achieve radial displacement, thus achieving the biasing function, and can also ensure the power transmission path after the output shaft 131 undergoes radial displacement, ensuring the use function of the electric drill 100.

[0054] In this embodiment, the output transmission assembly 18 is connected to the clutch assembly 15. It should be noted that the transmission shaft 141, the output transmission assembly 18, the clutch assembly 15, and the output shaft 131 may share some structures. At the same time, the output transmission assembly 18 and the clutch assembly 15 can be selectively set according to the actual requirements of different products.

[0055] As Figures 9 to 10 shown, the clutch assembly 15 includes a first locking portion 151 and a reset portion 152. Among them, the first locking portion 151 is used to hold the output shaft 131 in the first position or the second position. The first locking portion 151 includes a first limiting portion 1511 corresponding to the first position and a second limiting portion 1512 corresponding to the second position. The output shaft 131 can selectively connect to the first limiting portion 1511 or the second limiting portion 1512 at the corresponding position. Optionally, the first limiting portion 1511 corresponds to the output shaft 131 being in the first position, and the second limiting portion 1512 corresponds to the output shaft 131 being in the second position. The first limiting portion 1511 and the second limiting portion 1512 are formed or connected to the first mounting bracket 153. Optionally, the first limiting portion 1511 includes a limiting tooth 154, and the second limiting portion 1512 includes the same limiting tooth 154 as the first limiting portion 1511. A limiting tooth groove 1311 that cooperates with the limiting tooth 154 is formed or connected to the rear end of the output shaft 131. When the output shaft 131 is connected to the first limiting portion 1511 or the second limiting portion 1512, the limiting tooth groove 1311 is connected to the limiting tooth 154 to restrict the rotational movement of the output shaft 131 relative to the first limiting portion 1511 or the second limiting portion 1512. It can be understood that the positions of the limiting tooth and the limiting tooth groove can be interchanged with each other, which does not affect the essence of this application. In some embodiments, the cooperation between the output shaft and the limiting portion can also be completed through other mechanical cooperation structures to achieve the circumferential limitation of the output shaft by the limiting portion. In some embodiments, the cooperation between the output shaft and the limiting portion can also be completed by electromagnetic means to achieve the circumferential limitation of the output shaft by the limiting portion.

[0056] To achieve the position switching of the output shaft 131 relative to the output housing 113, a first mounting portion 134 is formed on or connected to the output shaft 131. A first connecting portion 155 coaxial with the third axis 103 is provided on the first mounting bracket 153. To enable the output shaft 131 to switch between a first position and a second position by rotating around the third axis 103, the first connecting portion 155 and the first mounting bracket 153 are connected by a first shaft 1552, and the first shaft 1552 is coaxial with the third axis 103. Optionally, the first shaft 1552 is disposed within the output housing 113, and the first shaft 1552 rotatably connects the first mounting portion 134 and the first mounting bracket 153, that is, rotatably connects the output shaft 131 and the first mounting bracket 153. So that the output shaft 131 is respectively connected to the first limiting portion 1511 or the second limiting portion 1512. Optionally, the first shaft 1552 is connected between the first limiting portion 1511 and the second limiting portion 1512.

[0057] The reset portion 152 is used to drive the clutch assembly 15 to switch from a disengaged state to an engaged state. Optionally, when the output shaft 131 is separated from the first limiting portion 1511 or the second limiting portion 1512, the reset portion 152 applies a force to make the output shaft 131 approach the first limiting portion 1511 or the second limiting portion 1512. In this embodiment, the reset portion 152 includes a helical spring. Optionally, the reset portion 152 is a compression spring. Optionally, to stably fix the reset portion 152, one end of the reset portion 152 is connected to the output shaft 131 and the other end is connected to the clutch assembly 15. Optionally, one end of the reset portion 152 is connected to the first mounting portion 134 and the other end is connected to the first mounting bracket 153. At the same time, to prevent the reset portion 152 from twisting, the reset portion 152 is sleeved on the first shaft 1552.

[0058] When the output shaft 131 is switched from the first position (such as Figure 10 ) to the second position (such as Figure 9 and Figure 11)For example, when the output shaft 131 is in the first position, the limiting tooth groove 1311 on the output shaft 131 engages with the limiting tooth 154 of the first limiting portion 1511, that is, the output shaft 131 is held within the first limiting portion 1511. At this time, the reset portion 152 is in a non-force-applying state, or applies a force to the output shaft 131 towards the first limiting portion 1511, so as to make the axial fit between the output shaft 131 and the first limiting portion 1511 more stable. By applying an external force to the output shaft 131 to apply a force away from the first limiting portion 1511, in this embodiment, it is to apply an axial and forward force to the output shaft 131 to disengage the output shaft 131 from the first limiting portion 1511. In this embodiment, for example, when the user pulls the output shaft forward, the reset portion 152 is compressed and stores energy at this time. By applying an external force to rotate the output shaft 131 around the third axis 103, and then moving from the first position to the second position, the output shaft 131 moves to a position substantially aligned with the second limiting portion 1512. After the external force is removed, the reset portion 152 releases energy to drive the output shaft 131 towards the second limiting portion 1512, so that the output shaft 131 enters the second limiting portion 1512, and the limiting tooth groove 1311 engages with the limiting tooth 154 of the second limiting portion 1512. The position switching of the output shaft 131 is completed.

[0059] In this embodiment, as Figure 10 shown, a displacement limiting groove 1132 is provided on the output housing 113, and the limiting groove 1132 is used to indicate the first position and the second position of the output shaft 131. So that the output shaft 131 can be more accurately aligned with the first limiting portion 1511 or the second limiting portion 1512.

[0060] As Figure 9 shown, the first mounting portion 134 includes a bearing seat 1341 for accommodating the first bearing 115, and the first mounting portion 134 is received by the output housing 113 into the receiving portion 1131.

[0061] The first transmission wheel 181 of the output transmission assembly 18 is in transmission connection with the first limiting portion 1511, and the second transmission wheel 182 is in transmission connection with the second limiting portion 1512. Optionally, the axle of the first transmission wheel 181 drives the first limiting portion 1511, and the axle of the second transmission wheel 182 drives the second limiting portion 1512. Optionally, when the output shaft 131 is in the first position, the output shaft 131 is coupled to the first transmission wheel 181. Optionally, when the output shaft 131 is in the second position, the output shaft 131 is coupled to the second transmission wheel 182.

[0062] In this embodiment, since the output axis 131 is substantially coaxial with the second axis 102 when the output shaft 131 is in the first position, the first transmission wheel 181 is coaxially coupled with the transmission shaft 141. Optionally, the transmission shaft 141 directly drives the first transmission wheel 181, that is to say, the transmission shaft 141 serves as the axle of the first transmission wheel 181. The axis 181a of the first transmission wheel 181 is the second axis 102. Optionally, the output transmission assembly 18 includes a wheel carrier 184, and the wheel carrier 184 is used to support the transmission wheel. In this embodiment, an axle is provided on the wheel carrier 184 in the form of a cantilever beam. Among them, a shaft hole 1841 is provided at the corresponding position of the first transmission wheel 181 so that the transmission shaft 141 passes through the wheel carrier 184 to connect the first transmission wheel 181. In other alternative embodiments, the first transmission wheel 181 is connected to the wheel carrier 184 through an axle and then connected to the transmission shaft 141. The second transmission wheel 182 is connected to the wheel carrier 184 through its axle 1842. Among them, the first transmission wheel 181 and the second transmission wheel 182 are respectively arranged on the first plane 1844 of the wheel carrier 184. The axis 181a of the first transmission wheel 181 and the axis 182a of the second transmission wheel 182 are arranged substantially parallel, and the rotation directions of the first transmission wheel 181 and the second transmission wheel 182 are the same. So that the steering directions of the output shaft 131 in the first position and the second position are the same. Therefore, the output part 18b further includes a third transmission wheel 183, and the third transmission wheel 183 is respectively in transmission connection with the first transmission wheel 181 and the second transmission wheel 182.

[0063] After the motor 12 drives the drive shaft 121 to start rotating, the transmission shaft 141 of the transmission mechanism 14 drives the first transmission wheel 181. The first transmission wheel 181 drives the second transmission wheel 182 through the third transmission wheel 183, and the second transmission wheel 182 moves in the same direction as the first transmission wheel 181. In this embodiment, the first transmission wheel 181, the third transmission wheel 183, and the second transmission wheel 182 are respectively cylindrical gears and are externally meshed. Optionally, the first transmission wheel 181, the third transmission wheel 183, and the second transmission wheel 182 are respectively in transmission connection with a transmission ratio of 1:1. Optionally, the transmission ratio of the first transmission wheel 181 to the third transmission wheel 183 is less than 1, and the transmission ratio of the third transmission wheel to the second transmission wheel 182 is greater than 1, ensuring that the rotational speeds of the first transmission wheel 181 and the second transmission wheel 182 are substantially the same. That is, the overall transmission connection from the first transmission wheel 181 to the second transmission wheel 182 is with a transmission ratio of 1:1.

[0064] In this embodiment, the axle 1843 of the third transmission wheel 183 is parallel but not coincident with the third axis 103. In other alternative embodiments, the axle 1843 of the third transmission wheel 183 is coaxial with the third axis 103.

[0065] As Figures 7 to 9As shown, the output transmission assembly 18 and the clutch assembly 15 are at least partially received in the second housing 112. The second housing 112 rotates relative to the drive housing 111, and the relative position of the output axis 104 with respect to the second axis 102 is adjusted by rotating the second housing 112. In this embodiment, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 56 mm. Since in this embodiment, the clutch assembly 15 and the single-layer gear assembly are used to achieve the position switching of the output shaft 131 and ensure the transmission path, the structural length of the part realizing the offset function of the output shaft 131 in this application is compact. Compared with the structure of two-stage or multi-stage offset gear transmission in the related art, the axial dimension is small and the product structure is compact. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 50 mm. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 51 mm, 52 mm, 53 mm, 54 mm, 55 mm. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 50 mm. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 45 mm. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 40 mm. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 35 mm. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 30 mm. In some embodiments, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 extends is less than or equal to 25 mm.

[0066] In this embodiment, the output transmission assembly 18 and the clutch assembly 15 are at least partially received in the output housing 113. When the output housing 113 rotates about the first central axis 105, the output transmission assembly 18 and the clutch assembly 15 at least partially rotate with the output housing 113. Optionally, the first transmission wheel 181 is coaxially connected to the transmission shaft 141. When the output housing 113 rotates, the output shaft 131 rotates about the first central axis 105 relative to the drive housing 111, and the second transmission wheel 182 and the third transmission wheel 183 rotate about the first central axis 105 relative to the drive housing 111. In some embodiments, due to styling or other requirements, the output housing is part of the second housing. In some embodiments, the second housing has an integral shape. When the second housing is the output housing, the axial length L of the output housing 113 is less than or equal to 56 mm. In some embodiments, the axial length L of the output housing 113 is less than or equal to 50 mm. In some embodiments, the axial length L of the output housing 113 is less than or equal to 51 mm, 52 mm, 53 mm, 54 mm, 55 mm. In some embodiments, the axial length L of the output housing 113 is less than or equal to 45 mm. In some embodiments, the axial length L of the output housing 113 is less than or equal to 40 mm. In some embodiments, the axial length L of the output housing 113 is less than or equal to 35 mm. In some embodiments, the axial length L of the output housing 113 is less than or equal to 30 mm. In some embodiments, the axial length L of the output housing 113 is less than or equal to 25 mm.

[0067] In some alternative embodiments, the output transmission assembly 18 and the clutch assembly 15 or a part of the output transmission assembly 18 and the clutch assembly 15 are provided as detachable accessory parts. When an accessory is to achieve multiple offset dimensions, the second housing or the output housing or the second housing and the output housing serve as the housing of the accessory, or the second housing or the output housing or the second housing and the output housing serve as the housing of a part of the accessory. In such an embodiment, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 56 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft 1 extending position is less than or equal to 50 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 51 mm, 52 mm, 53 mm, 54 mm, 55 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 50 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 45 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 40 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 35 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 30 mm. In some embodiments, the axial length L from the rear end of the second housing to the end face at the output shaft extending position is less than or equal to 25 mm.

[0068] Such as Figure 11As shown, the second locking component 19 includes a locking gear ring 191 and a sliding part 192. One end of the sliding part 192 forms or is connected to an operating member 193. The operating member 193 is at least partially located on the visible surface and is used to be activated for operation. In this embodiment, the operating member 193 is arranged on the driving housing 111. When the second locking component 19 locks the rotation of the second housing 112 relative to the driving housing 111, the sliding part 192 cooperates with the tooth part on the locking gear ring 191 to limit the rotation of the second housing 112. Optionally, the sliding part 192 is connected to the driving housing 111, the locking gear ring 191 is arranged on the output housing 113, and the locking gear ring 191 rotates with the output housing 113. Optionally, the locking gear ring 191 includes a plurality of tooth parts 1911, so that the output housing 113 includes a plurality of locking positions, so that the electric drill 100 can be offset in multiple directions. The applicable working conditions are more diverse. An external force drives the sliding part 192 to separate the sliding part 192 from the tooth part 1911 of the locking gear ring 191, and the user can rotate the output housing 113. After the external force is withdrawn, the sliding part 192 slides under the driving force of the driving part 194 to cooperate with the tooth part 1911 on it or drives the locking gear ring 191 to rotate to the tooth part 1911 closest to the sliding part 192 to cooperate with the sliding part 192. When the driving part 194 applies the driving force, the cooperation between the sliding part 192 and the tooth part 1911 is more stable, providing sufficient locking force. Optionally, the driving part 194 is a spring.

[0069] In some alternative embodiments, the operating member 193 may not be provided. By rotating the output housing 113, the sliding part 192 is driven to generate a displacement so that the sliding part 192 is separated from the locking gear ring 191, thereby completing the rotational movement of the output housing 113.

[0070] The foregoing has shown and described the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A hand-held power tool, comprising: a motor including a drive shaft that rotates about a first axis; a drive housing for at least housing the motor; an output shaft including an output axis defined by itself, the output shaft rotates about the output axis to output power; a transmission mechanism for connecting the drive shaft, the transmission mechanism configuring a transmission shaft; an output transmission assembly disposed between the transmission shaft and the output shaft; the output transmission assembly includes an input portion connecting the transmission shaft and an output portion connecting the output shaft; the output portion includes a first transmission wheel and a second transmission wheel, and the output shaft can selectively be coupled with the first transmission wheel or the second transmission wheel to transmit the power of the transmission shaft to the output shaft.

2. The hand-held power tool according to claim 1, characterized in that, It further includes an output housing for supporting the rotation of the output shaft, and the output housing is configured with a first central axis passing through the geometric center; the output shaft includes: a first position where the radial distance between the output axis and the first central axis is D1 and a second position where the radial distance between the output axis and the first central axis is D2.

3. The hand-held power tool according to claim 2, characterized in that, When the output shaft is in the first position, the output shaft is coupled with the first transmission wheel.

4. The hand-held power tool according to claim 2, characterized in that, The axes of the first transmission wheel and the second transmission wheel are arranged substantially parallel, and the rotation directions of the first transmission wheel and the second transmission wheel are the same.

5. The hand-held power tool according to claim 2, characterized in that, The output portion further includes a third transmission wheel, and the third transmission wheel is respectively in transmission connection with the first transmission wheel and the second transmission wheel.

6. The hand-held power tool according to claim 1, characterized in that, The output shaft forms or is connected with a clamping portion for connecting a working component, and the working component is configured to realize the function of the hand-held power tool.

7. The hand-held power tool according to claim 2, characterized in that, It further includes a first bearing for supporting the rotation of the output shaft about the output axis, and the output housing is provided with a receiving portion for receiving the first bearing.

8. The hand-held power tool according to claim 2, characterized in that, The output housing rotates relative to the drive housing about the first central axis.

9. The hand-held power tool according to claim 2, characterized in that, The output shaft rotates relative to the output housing about a third axis, and the third axis is eccentrically arranged with respect to the first central axis.

10. The hand-held power tool according to claim 9, characterized in that, The axis of at least one of the first transmission wheel and the second transmission wheel is offset with respect to the first central axis, and when the output housing rotates relative to the drive housing about the first central axis, the offset transmission wheel rotates relative to the drive housing about the first central axis.

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