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; an output housing defining a first central axis passing through a geometric center; the radial distance between the first central shaft and the outer edge of the output shell is R; the output shaft comprises a first position and a second position; when the output shaft is located at the first position, the radial distance between the output axis and the first center shaft is D1; when the output shaft is located at the second position, the radial distance between the output axis and the first center shaft is D2, D1 is smaller than D2, D1 is larger than or equal to 0 and smaller than R, and D2 is larger than 0 and smaller than or equal to R. The handheld power tool is high in working efficiency and compact in structure.

Description

Technical Field

[0001] The present application relates to the field of power tools, and 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 inner 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 edge attachment, the machine needs to be tilted for operation, which easily leads to the scrapping of fasteners and damage to workpieces.

[0003] This part provides background information related to the present application, and these background information are not necessarily prior art. Summary of the Invention

[0004] An object of the present application is to solve or at least alleviate part 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.

[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 that at least houses the motor; an output shaft including an output axis defined by itself, the output shaft rotates about the output axis to output power; an output housing for supporting the rotation of the output shaft, the output housing defining a first central axis passing through the geometric center; the radial distance between the first central axis and the outer edge of the output housing is R; the output shaft includes a first position and a second position; wherein, when the output shaft is in the first position, the radial distance between the output axis and the first central axis is D1; when the output shaft is in the second position, the radial distance between the output axis and the first central axis is D2, D1 is less than D2, 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.

[0006] In some embodiments, the output shaft housing rotates relative to the drive housing about the first central axis.

[0007] In some embodiments, when the output shaft is in the second position, the output shaft rotates relative to the drive housing about the first central axis.

[0008] In some embodiments, it further includes a first locking portion for holding the output shaft in the first position or the second position.

[0009] In some embodiments, when the output shaft is in the first position, the output shaft rotates relative to the drive housing about the first central axis.

[0010] In some embodiments, the output shaft is formed with or connected to a clamping portion for connecting a working component, and the working component is configured to implement the functions of a handheld power tool.

[0011] In some embodiments, it further includes a first bearing that supports 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.

[0012] In some embodiments, it further includes a second locking assembly for selectively locking the rotation of the output housing relative to the drive housing.

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

[0014] In some embodiments, it further includes a transmission mechanism for connecting the drive shaft and the output shaft. The transmission mechanism is configured with a transmission shaft that defines its own second axis, and the transmission shaft drives the output shaft. When the output shaft is in the first position or the second position, the output axis is radially offset from the second axis.

[0015] A handheld power tool, comprising: a motor including a drive shaft that rotates about a first axis; a drive housing that at least houses the motor; an output shaft including an output axis defined by itself, and the output shaft rotates about the output axis to output power; an output housing for supporting the rotation of the output shaft, and the output housing defines a first central axis passing through its geometric center; the output shaft includes a first position and a second position; wherein, when the output shaft is in the first position, the radial distance between the output axis and the first central axis is D1; when the output shaft is in the second position, the radial distance between the output axis and the first central axis is D2, and D1 is not equal to D2.

[0016] A handheld power tool, comprising: a motor including a drive shaft that rotates about a first axis; a drive housing that at least houses the motor; an output shaft including an output axis defined by itself, and the output shaft rotates about the output axis to output power; an output housing for supporting the rotation of the output shaft, and the output housing defines a first central axis passing through its geometric center; wherein, the output shaft moves relative to the output housing so that the output axis is radially offset relative to the first central axis.

[0017] In some embodiments, 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.

[0018] In some embodiments, the output shaft is formed with or connected to a clamping portion for connecting a working component, and the working component is configured to implement the functions of a handheld power tool.

[0019] In some embodiments, it further includes a first bearing for supporting the output shaft to rotate around the output axis, and the output housing is provided with a receiving portion for receiving the first bearing.

[0020] The advantages of the present application are as follows: Through the relative movement of the output shaft relative to the output housing, the output shaft of the handheld power tool includes: a first position greater than or equal to 0 and less than R from the first central axis and a second position greater than 0 and less than or equal to R, so that the handheld power tool is configured in a state where the output shaft is offset. By providing an output shaft that can move radially relative to the output housing, a biasing form in which the output shaft is offset relative to the center can be achieved without using accessories. The user can achieve the switching of the relative position of the output shaft and use it only by adjusting the position of the output shaft, which is convenient to switch and thus improves work efficiency. There is no need to carry additional accessories, improving the user experience. Description of the Drawings

[0021] Figure 1 is a structural diagram of an embodiment in the present application, where the handheld power tool is in the first state; Figure 2 is a structural diagram of another perspective of an embodiment in the present application, where the output shaft is in the first position; Figure 3 is a structural diagram of an embodiment in the present application, where the output shaft is in the second position; Figure 4 is a structural diagram of another perspective of an embodiment in the present application, where the handheld 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 4 a structural diagram of another perspective; Figure 7 is Figure 2 a cross-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, where 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, where the output shaft is in the second position; Figure 12 is a cross-sectional view of the clamping portion of an embodiment in the present application. Detailed Embodiments

[0022] Before explaining any embodiments 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.

[0023] In the present application, the terms "comprising", "including", "having" or any other variants 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 statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0024] In the present application, the term "and / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in the present application, the character " / " generally indicates that the associated objects before and after are in an "and / or" relationship.

[0025] In the present application, the terms "connect", "combine", "couple", "mount" can be direct connection, combination, coupling or mounting, or 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 to provide 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 can include electrical connection or coupling.

[0026] In the present application, those of ordinary skill in the art will understand that relative terms used in combination 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. Relative terms may refer to plus or minus a certain percentage (such as 1%, 5%, 10% or more) of the indicated value. A numerical value without the use of a relative term should also be disclosed as a particular value having a tolerance. In addition, when expressing a relative angular positional relationship (such as substantially parallel, substantially perpendicular), "substantially" may refer to plus or minus a certain number of degrees (such as 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0027] In this application, those of ordinary skill in the art will understand that the functions performed by components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by parts can also be performed by one part, one component, or a combination of multiple parts.

[0028] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", and "rear" 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 the orientation terms such as the upper side, lower side, left side, right side, front side, and rear side 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.

[0029] 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 tightening or loosening of fasteners through rotational output.

[0030] As Figure 1 shown, taking the drill 100 as an example. The 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 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 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 by cooperating with the corresponding rectification, filtering, and voltage regulation circuits. In the following description, the battery pack 30 will be used instead of the power supply, but this should not be construed as a limitation on the present invention.

[0031] As Figures 1 to 9As 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 a first axis 101. In this embodiment, the motor 12 is specifically configured as an electric motor, and hereinafter the electric motor 12 will be used instead of the motor, but this does not limit the present 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 an inner rotor motor, the stator assembly 122 is sleeved outside the rotor assembly 123. For an outer rotor motor, the rotor assembly 123 is sleeved outside the stator assembly 122. In this embodiment, the brushless motor is configured 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 the present application.

[0032] As Figure 1 shown, the housing 11 includes a drive housing 111 for accommodating the motor and a second housing 112 for accommodating at least a 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, facilitating the user to hold and operate. One end of the grip portion 114 is connected to a battery pack 30.

[0033] The output assembly 13 is used to drive a 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 an 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 12 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 the present application, for the purpose of simplicity of the specification, detailed descriptions are omitted and no specific limitations are made.

[0034] As Figures 7 to 9As shown, a transmission mechanism 14 is connected between the output assembly 13 and the motor 12, for example, a high-speed and high-torque output tool such as a screwdriver or a drill. The transmission mechanism 14 is used to connect the drive shaft 121 and the output shaft 131. The transmission mechanism 14 is configured as a transmission shaft 141 that defines a second axis 102, 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 deceleration, and the number of the 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 a suitable torque. In this embodiment, a sun gear is formed or connected on the drive shaft 121, and the planetary gears are meshed with the sun gear. The transmission shaft 141 is configured on the planetary carrier on the side 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 of the drive shaft 121 after the deceleration and torque increase process of the transmission mechanism 14.

[0035] In some alternative embodiments, the transmission mechanism 14 further includes an impact assembly for applying impact force to the output shaft 131, such as an impact wrench, an impact drill or an electric hammer, etc. Optionally, the transmission shaft 141 is the impact force output shaft of the impact assembly, that is, the transmission shaft 141 is the impact force output end of the transmission mechanism 14.

[0036] 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 to the first axis 101. In other alternative embodiments, the second axis 102 and the output axis 104 are arranged parallel to each other but not coincident.

[0037] The transmission mechanism 14 also includes a shift assembly 143 to achieve multi-speed output through multiple sets of gears with different transmission ratios. Because the working principle of planetary gear reduction and the reduction generated by such a transmission mechanism 14 are already fully disclosed to professionals in the field, a detailed description is omitted here for the purpose of brevity of the specification.

[0038] 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.

[0039] like Figures 1 to 7As shown, the electric drill 100 further 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 holding part 114 for the user to operate. The rotational 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 a sliding rheostat 162. When the trigger stroke of the trigger switch is different, 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 rotational 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. At this time, the rotational speed of the motor 12 is also small. In some embodiments, the impact wrench stores the mapping relationship between the trigger stroke of the trigger switch and the PWM signal. This mapping relationship can be linear or non-linear. The embodiments of the present application do not limit this.

[0040] The switching unit 163 is arranged on the upper side of the trigger switch. The switching unit 163 is configured to be operated to set the rotational direction of the motor to the forward rotation direction for tightening the fastener or the reverse rotation direction for loosening the fastener.

[0041] In this embodiment, the second housing 112 includes an output housing 113 for supporting the rotation of the output shaft 131. As Figures 7 to 9 shown, the output housing 113 is provided with a receiving portion 1131. A first bearing 115 for supporting the output shaft 131 to rotate around the output axis 104 is sleeved outside the output shaft 131. The receiving portion 1131 is used for installing 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 relative to the output housing 113 around the output axis 104 to operate the fastener. Optionally, the first bearing 115 further includes a sliding bearing, such as an oil-impregnated bearing. In some embodiments, as Figure 12 shown, for example, in the drill type, 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.

[0042] As Figures 1 to 2 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 Figure 3 shown in FIGS. 4 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 the output shaft 131, which is the operating condition of an ordinary fastening type handheld power tool. As Figure 3 shown in FIGS. 4 to 5, the second state can be understood as an “edge-adjacent” state in which the output shaft 131 is offset.

[0043] As shown Figures 1 to 4 in the figure, 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 configures a stop point, and each stop point is radially offset along the first central axis 105 relative to another stop point. Through 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 edge-attachment function with the output shaft 131 offset, generally when implementing the edge-attachment 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 requires the output shaft 131 to be offset for edge-attachment, 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 edge-attachment working condition and the non-edge-attachment working condition, which is not conducive to work efficiency.

[0044] 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 shown Figure 2 in the first position and as shown Figure 4 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.

[0045] 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, and 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 shown Figure 2 , Figure 4 and Figure 6As 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 through the geometric center. Since the radial distance between the first central axis 105 and the outer edge of the output housing 113 is R, R is not necessarily a fixed value. The above does not affect the substantial content of this application.

[0046] 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 a biased form with the output shaft 131 offset from the center without using additional accessories. The user can switch between the two states and use them simply 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, enhancing the user experience.

[0047] 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 more flexibly relative to the first central axis 105 within the range from 0 to R.

[0048] In some alternative embodiments, the first position and the second position of the output shaft 131 correspond to two different edge-adjacent states with the output shaft 131 offset. In this case, it can be understood that when the output shaft 131 is at the first position and the second position, the electric drill 100 is in the second state. For such embodiments, the output shaft 131 can be the accessory output shaft of an accessory product, and the output housing 113 can be the housing of the accessory product, enabling multiple edge-adjacent dimensions with different offsets to be achieved using one accessory product, which can be applied to multiple edge-adjacent working conditions. The output shaft can be adjusted more flexibly relative to the first central axis 105 within the range from 0 to R. Therefore, when the first position and the second position of the output shaft 131 correspond to two different edge-adjacent states, it is also applicable to products with accessories and can also improve work efficiency.

[0049] 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 to each other.

[0050] Optionally, the output shaft 131 rotates relative to the output housing 113 about the third axis 103. That is, the output shaft 131 rotates about the third axis 103 to achieve the first position (such as Figure 1 ) and the second position (such as Figure 3The switching between them. Among them, the third axis 103 is parallel to the first central axis 105 but is 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 achieved by radial translational movement or rotational movement relative to other reference axes.

[0051] As Figures 1 to 2 shown, when the output axis 104 is in the 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, where 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 basically the same as that of a conventional electric drill or a tool that rotates to output 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 (that is, the electric drill 100 without the edge attachment function) is basically 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 basically 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 of the product with the 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.

[0052] In this embodiment, the output shaft 131 that can move relative to the output housing 113 is used so that the output shaft 131 can be offset relative to the first central axis 105 of the output housing 113 and can also return to the center of the output housing 113 or a position relatively close to the center. On the one hand, the shape and usage habit of a conventional screwdriver in the related art can be maintained. On the other hand, the shaking of the output shaft 131 in the first state can be reduced.

[0053] In this embodiment, when the electric drill 100 is in the second state, according to the above, the output shaft 131 radially displaces around the third axis 103 relative to the output housing 113 to the second position.

[0054] As shown Figures 4 to 5A in FIG. -5C, to achieve the multi-directional offset of the electric drill 100, in the present embodiment, when the output shaft 131 is in the second position, the output shaft 131 rotates about the first central axis 105 relative to the drive housing 111. So that the output shaft 131 can complete the offset in multiple directions. Optionally, the output housing 113 rotates about the first central axis 105 relative to the drive housing 111, 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 the present 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 the present 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 about the first central axis 105 relative to the drive housing 111, 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 the present embodiment, the second housing 112 and the output housing 113 rotate synchronously or are integrally formed, but due to the appearance modeling requirements 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 will not change the relative position of the output axis with respect to the second axis, such rotating components do not belong to the second housing part.

[0055] Since the output shaft 131 needs to be stably connected and driven when working, that is, when outputting power, the electric drill 100 further includes a first locking portion 151 for holding the output shaft 131 in the first position or the 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.

[0056] As shown Figures 7 to 11As 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 realize 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 realized 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.

[0057] By providing the clutch assembly 15 with a disengaged state, the output shaft 131 can achieve radial displacement and thus achieve the biasing function. And 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.

[0058] 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 setting 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, and thus achieve the biasing function. And it can also ensure the power transmission path after the output shaft 131 undergoes radial displacement, ensuring the use function of the electric drill 100.

[0059] In this embodiment, the output transmission assembly 18 is connected to the clutch assembly 15. It should be noted that the drive shaft 141, the output transmission assembly 18, the clutch assembly 15, and the output shaft 131 can share some structures. At the same time, the output transmission assembly 18 and the clutch assembly 15 can be selectively provided according to different actual product requirements.

[0060] As Figures 9 to 10As 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 on 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 on 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, which does not affect the substantial content 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 through an electromagnetic method to achieve the circumferential limitation of the output shaft by the limiting portion.

[0061] To realize 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 the first position and the 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 to the first mounting bracket 153, that is, rotatably connects the output shaft 131 to 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.

[0062] The reset part 152 is used to drive the clutch assembly 15 to switch from the separated state to the connected state. Optionally, when the output shaft 131 is separated from the first limiting part 1511 or the second limiting part 1512, the reset part 152 applies a force to make the output shaft 131 approach the first limiting part 1511 or the second limiting part 1512. In this embodiment, the reset part 152 includes a helical spring. Optionally, the reset part 152 is a compression spring. Optionally, to stably fix the reset part 152, one end of the reset part 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 part 152 is connected to the first mounting part 134, and the other end is connected to the first mounting bracket 153. At the same time, to prevent the reset part 152 from twisting, the reset part 152 is sleeved on the first shaft 1552.

[0063] Taking the output shaft 131 switching from the first position (such as Figure 10 ) to the second position (such as Figure 9 and Figure 11 ) as an 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 part 1511, that is, the output shaft 131 is kept within the first limiting part 1511. At this time, the reset part 152 is in a non-force-applying state, or applies a force to the output shaft 131 towards the first limiting part 1511 to make the axial fit between the output shaft 131 and the first limiting part 1511 more stable. By applying an external force to the output shaft 131 to apply a force away from the first limiting part 1511, in this embodiment, an axial and forward force is applied to the output shaft 131 to disengage the output shaft 131 from the first limiting part 1511. In this embodiment, for example, the user pulls the output shaft forward, and at this time the reset part 152 is compressed and stores energy. By applying an external force to make the output shaft 131 rotate around the third axis 103, and then move from the first position to the second position, the output shaft 131 moves to a position basically aligned with the second limiting part 1512. After the external force is withdrawn, the reset part 152 releases energy to drive the output shaft 131 towards the second limiting part 1512, so that the output shaft 131 enters the second limiting part 1512, and the limiting tooth groove 1311 engages with the limiting tooth 154 of the second limiting part 1512. The position switching of the output shaft 131 is completed.

[0064] 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 part 1511 or the second limiting part 1512.

[0065] As Figure 9 shown, the first mounting part 134 includes a bearing seat 1341 for accommodating the first bearing 115, and the first mounting part 134 is received by the output housing 113 into the receiving part 1131.

[0066] The first driving wheel 181 of the output transmission assembly 18 is in driving connection with the first limiting part 1511, and the second driving wheel 182 is in driving connection with the second limiting part 1512. Optionally, the axle of the first driving wheel 181 drives the first limiting part 1511, and the axle of the second driving wheel 182 drives the second limiting part 1512. Optionally, when the output shaft 131 is in the first position, the output shaft 131 is coupled with the first driving wheel 181. Optionally, when the output shaft 131 is in the second position, the output shaft 131 is coupled with the second driving wheel 182.

[0067] In this embodiment, since the output axis 104 is substantially coaxial with the second axis 102 when the output shaft 131 is in the first position, the first driving wheel 181 is coaxially coupled with the transmission shaft 141. Optionally, the transmission shaft 141 directly drives the first driving wheel 181, that is to say, the transmission shaft 141 serves as the axle of the first driving wheel 181. The axis 181a of the first driving wheel 181 is the second axis 102. Optionally, the output transmission assembly 18 includes a wheel carrier 184 for supporting the driving wheels. In this embodiment, the wheel carrier 184 is provided with an axle in the form of a cantilever beam. Among them, a shaft hole 1841 is provided at the corresponding position of the first driving wheel 181 so that the transmission shaft 141 passes through the wheel carrier 184 to connect the first driving wheel 181. In other alternative embodiments, the first driving wheel 181 is connected to the wheel carrier 184 through an axle and then connected to the transmission shaft 141. The second driving wheel 182 is connected to the wheel carrier 184 through its axle 1842. Among them, the first driving wheel 181 and the second driving wheel 182 are respectively arranged on the first plane 1844 of the wheel carrier 184. The axis 181a of the first driving wheel 181 and the axis 182a of the second driving wheel 182 are arranged substantially parallel, and the rotation directions of the first driving wheel 181 and the second driving 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 driving wheel 183, and the third driving wheel 183 is in driving connection with the first driving wheel 181 and the second driving wheel 182 respectively.

[0068] After the drive shaft 121 of the motor 12 starts to rotate, 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 connected by 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 is greater than 1, ensuring that the rotational speeds of the first transmission wheel 181 and the second transmission wheel 182 are basically the same. That is, the overall connection from the first transmission wheel 181 to the second transmission wheel 182 is by a transmission ratio of 1:1.

[0069] In this embodiment, the axle 1843 of the third transmission wheel 183 is parallel to 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.

[0070] Such 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, therefore, the structural length of the output shaft 131 offset function part of 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.

[0071] 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.

[0072] 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, serves as the housing of the accessory, or the second housing or the output housing, or the second housing and the output housing, serves 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 portion 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 portion 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 portion 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 portion 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 portion 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 portion 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 portion 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 portion 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 portion is less than or equal to 25 mm.

[0073] Such as Figure 11As shown, the second locking assembly 19 includes a locking gear ring 191 and a sliding portion 192. One end of the sliding portion 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 assembly 19 locks the rotation of the second housing 112 relative to the driving housing 111, the sliding portion 192 cooperates with the tooth portion on the locking gear ring 191 to limit the rotation of the second housing 112. Optionally, the sliding portion 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 portions 1911, so that the output housing 113 includes a plurality of locking positions, enabling the electric drill 100 to be offset in multiple directions. The applicable working conditions are more diverse. An external force drives the sliding portion 192 to separate the sliding portion 192 from the tooth portion 1911 of the locking gear ring 191, and the user can rotate the output housing 113. After the external force is withdrawn, the sliding portion 192 slides under the driving force of the driving portion 194 to cooperate with the tooth portion 1911 on it or drive the locking gear ring 191 to rotate to the tooth portion 1911 closest to the sliding portion 192 to cooperate with the sliding portion 192. When the driving portion 194 applies the driving force, the cooperation between the sliding portion 192 and the tooth portion 1911 is more stable, providing sufficient locking force. Optionally, the driving portion 194 is a spring.

[0074] In some alternative embodiments, the operating member 193 may not be provided. By rotating the output housing 113, the sliding portion 192 is driven to generate a displacement so that the sliding portion 192 is disengaged from the locking gear ring 191, thereby completing the rotational movement of the output housing 113.

[0075] 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 that at least houses the motor; An output shaft including an output axis defined by itself, the output shaft rotates about the output axis to output power; An output housing for supporting the rotation of the output shaft, the output housing defines a first central axis passing through the geometric center; the radial distance between the first central axis and the outer edge of the output housing is R; The output shaft includes a first position and a second position; wherein, when the output shaft is in the first position, the radial distance between the output axis and the first central axis is D1; when the output shaft is in the second position, the radial distance between the output axis and the first central axis is D2, D1 is less than D2, D1 is greater than or equal to 0 and less than R, D2 is greater than 0 and less than or equal to R.

2. The hand-held power tool according to claim 1, characterized in that, The output shaft housing rotates relative to the drive housing about the first central axis.

3. The hand-held power tool according to claim 1, characterized in that, When the output shaft is in the second position, the output shaft rotates about the first central axis relative to the drive housing.

4. The hand-held power tool according to claim 1, characterized in that, Further comprising a first locking portion for holding the output shaft in the first position or the second position.

5. The hand-held power tool according to claim 1, characterized in that, When the output shaft is in the first position, the output shaft rotates about the first central axis relative to the drive housing.

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 1, characterized in that, Further comprising 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, Further comprising a second locking assembly for selectively locking the rotation of the output housing relative to the drive housing.

9. The hand-held power tool according to claim 1, characterized in that, The output shaft rotates relative to the output housing about a third axis to switch between the first position and the second position, and the third axis is eccentrically arranged with respect to the first central axis.

10. The hand-held power tool according to claim 1, characterized in that, Further comprising a transmission mechanism for connecting the drive shaft and the output shaft, the transmission mechanism is configured with a transmission shaft defining a second axis by itself, the transmission shaft drives the output shaft, and when the output shaft is in the first position or the second position, the output axis is radially offset from the second axis.

11. A hand-held power tool, comprising: A motor including a drive shaft that rotates about a first axis; A drive housing that at least houses the motor; An output shaft including an output axis defined by itself, the output shaft rotates about the output axis to output power; An output housing for supporting the rotation of the output shaft, the output housing defines a first central axis passing through the geometric center; The output shaft includes a first position and a second position; wherein, when the output shaft is in the first position, the radial distance between the output axis and the first central axis is D1; when the output shaft is in the second position, the radial distance between the output axis and the first central axis is D2, D1 is not equal to D2.

12. A hand-held power tool, comprising: A motor including a drive shaft that rotates about a first axis; A drive housing that at least houses the motor; An output shaft, including an output axis defined by itself, and the output shaft rotates around the output axis to output power; An output housing for supporting the rotation of the output shaft, and the output housing defines a first central axis passing through the geometric center; wherein, the output shaft moves relative to the output housing so that the output axis is radially offset relative to the first central axis.

13. The hand-held power tool according to claim 12, characterized in that, 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.

14. The hand-held power tool according to claim 12, characterized in that, The output shaft forms or is connected with a clamping part for connecting a working part, and the working part is configured to realize the functions of the handheld power tool.

15. The hand-held power tool according to claim 12, characterized in that, It further includes a first bearing for supporting the output shaft to rotate around the output axis, and the output housing is provided with a receiving part for receiving the first bearing.

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