CN120190791A - Handheld Power Tools - Google Patents

Abstract

The present application discloses a handheld power tool, comprising: an output shaft, including an output axis defined by itself; a transmission mechanism, the transmission mechanism is equipped with a transmission shaft; an output transmission assembly, arranged between the transmission shaft and the output shaft; the output transmission assembly comprises an input portion connected to the transmission shaft, and an output portion connected to the output shaft; the output portion comprises a first transmission wheel and a second transmission wheel, and the output shaft can be selectively coupled with the first transmission wheel or the second transmission wheel to transmit the power of the transmission shaft to the output shaft. The handheld power tool of the present application has high working efficiency.

Description

Hand-held power tool

Technical Field

The application relates to the field of power tools, in particular to a handheld power tool.

Background

In the related art, the hand-held power tool is widely applied in life due to the characteristics of convenience and high output efficiency, and in working conditions of use, the situation that one side is provided with an obstacle, such as a connection position of a wall and a floor, the internal position of a cabinet or other working conditions needing to bias an output shaft, is often encountered. In the related art, in hand-held power tools, particularly fastening tools, the output shaft is located substantially at the center of the machine to ensure stability of the torque output process. However, when working conditions requiring welting are met, the machine needs to be used in an inclined mode to operate, and scrapping of the fastener and damage to the workpiece are easy to cause.

This section provides background information related to the application, which is not necessarily prior art.

Disclosure of Invention

It is an object of the present application to solve or at least mitigate some or all of the above problems. It is therefore an object of the present application to provide a hand-held power tool that achieves output shaft biasing without the need for attachment and detachment of an accessory.

In order to achieve the above object, the present application adopts the following technical scheme:

A hand-held power tool includes a motor including a drive shaft rotatable about a first axis, a drive housing for receiving at least the motor, an output shaft including a self-defined output axis about which the output shaft rotates to output power, a transmission mechanism for connecting the drive shaft, the transmission mechanism being configured to transmit the drive shaft, an output transmission assembly disposed between the drive shaft and the output shaft, the output transmission assembly including an input portion connected to the drive shaft and an output portion connected to the output shaft, the output portion including a first drive wheel and a second drive wheel, the output shaft being selectively coupled to either the first drive wheel or the second drive wheel to transfer power from the drive shaft to the output shaft.

In some embodiments, an output housing is also included for supporting rotation of the output shaft, the output housing configured with a first central axis passing through the geometric center, the output shaft including a first position having a radial distance D1 from the first central axis and a second position having a radial distance D2 from the first central axis.

In some embodiments, the output shaft is coupled with the first drive wheel when the output shaft is in the first position.

In some embodiments, the axes of the first and second drive wheels are disposed substantially parallel, and the first and second drive wheels rotate in the same direction.

In some embodiments, the output further comprises a third drive wheel drivingly connected to the first drive wheel and the second drive wheel, respectively.

In some embodiments, the output shaft forms or has attached thereto a grip for connecting a working member configured to perform the function of a hand-held power tool.

In some embodiments, the output housing is provided with a receiving portion for receiving the first bearing.

In some embodiments, the output housing rotates about a first central axis relative to the drive housing.

In some embodiments, the output shaft rotates relative to the output housing about a third axis that is disposed off-center from the first central axis.

In some embodiments, the axis of at least one of the first and second drive wheels is offset from the first central axis, the offset drive wheel rotating about the first central axis relative to the drive housing when the output housing rotates about the first central axis relative to the drive housing.

The application has the advantages that the output transmission assembly is connected with the transmission shaft and the output shaft and comprises the first transmission shaft and the second transmission shaft, the output shaft can be selectively coupled with the first transmission wheel or the second transmission wheel through the arrangement of the output shaft, so that the output shaft can realize the offset function, and the arrangement of the connection state can ensure the transmission path of power after the radial displacement of the output shaft, thereby ensuring the use function of the hand-held power tool. The switching and the use of two states can be realized, and the switching is convenient so as to improve the working efficiency. No extra accessories are needed to be carried, and the user experience is improved.

Drawings

FIG. 1 is a block diagram of one embodiment of the present application in which a hand-held power tool is in a first state;

FIG. 2 is a block diagram of another perspective of an embodiment of the present application with the output shaft in a first position;

FIG. 3 is a block diagram of an embodiment of the present application in which the output shaft is in a second position;

FIG. 4 is a block diagram of another perspective of an embodiment of the present application wherein the hand-held power tool is in a second state;

FIGS. 5A-5C are schematic illustrations of an output shaft in a second position according to an embodiment of the present application;

FIG. 6 is a block diagram of another view of FIG. 4;

FIG. 7 is a cross-sectional view of A-A of FIG. 2;

FIG. 8 is a partial block diagram of the internal structure of an embodiment of the present application;

FIG. 9 is a schematic diagram of the semi-sectional view of FIG. 8;

FIG. 10 is an exploded view of a portion of the structure of an embodiment of the present application with the output shaft in a first position;

FIG. 11 is an exploded view of a portion of the structure of an embodiment of the present application with the output shaft in a second position;

fig. 12 is a cross-sectional view of a clip portion according to an embodiment of the present application.

Detailed Description

Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings.

In the present disclosure, the terms "comprises," "comprising," "has," "having," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the present application, the term "and/or" is an association relationship describing an association object, meaning that three relationships may exist. For example, A and/or B may mean that A alone, both A and B, and B alone are present. In the present application, the character "/" generally indicates that the front and rear related objects are in an "and/or" relationship.

In the present application, the terms "connected," "coupled," and "mounted" may be directly connected, coupled, or mounted, or indirectly connected, coupled, or mounted. By way of example, two parts or components are connected together without intermediate members, and by indirect connection is meant that the two parts or components are respectively connected to at least one intermediate member, through which the two parts or components are connected. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings, and may include electrical connections or couplings.

In the present application, one of ordinary skill in the art will understand that relative terms (e.g., "about," "approximately," "substantially," etc.) used in connection with quantities or conditions are intended to encompass the values and have the meanings indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a particular value, the tolerance associated with a particular value resulting from manufacture, assembly, use, and the like. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. Relative terms may refer to the addition or subtraction of a percentage (e.g., 1%,5%,10% or more) of the indicated value. Numerical values, not employing relative terms, should also be construed as having specific values of tolerance. Further, "substantially" when referring to relative angular positional relationships (e.g., substantially parallel, substantially perpendicular) may refer to adding or subtracting a degree (e.g., 1 degree, 5 degrees, 10 degrees, or more) from the indicated angle.

In the present application, those of ordinary skill in the art will appreciate that the functions performed by a component may be performed by a component, a plurality of components, a part, or a plurality of parts. Also, the functions performed by the elements may be performed by one element, by an assembly, or by a combination of elements.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", and the like are described in terms of orientation and positional relationship shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements. It should also be understood that the terms upper, lower, left, right, front, back, etc. are not only intended to represent positive orientations, but also to be construed as lateral orientations. For example, the lower side may include a right lower side, a left lower side, a right lower side, a front lower side, a rear lower side, and the like.

As shown in fig. 1, a hand-held power tool, in this embodiment, a power drill 100. In some embodiments, other hand-held tools are also possible, such as impact wrenches, impact screwdrivers, impact drills, electric hammers, angle grinders, or angle tools. In some embodiments, the hand-held power tool is a tool that implements a power tool through a rotational output. In some embodiments, the hand-held power tool is a tool that effects tightening or loosening of a fastener through a rotational output.

As shown in fig. 1, an electric drill 100 is exemplified. The drill 100 includes a power supply 30. In this embodiment, the power supply 30 is a dc power supply. The dc power source is used to provide power to the drill 100. The dc power source is a battery pack, which cooperates with a corresponding power circuit to power the drill 100. It should be understood by those skilled in the art that the power supply is not limited to the use of a dc power supply, and may also be implemented to supply power to corresponding components in the machine by using a mains supply, an ac power supply, and corresponding rectifying, filtering and voltage regulating circuits. The battery pack 30 will be replaced with a power supply, which will be described later, but it is not intended as a limitation of the present invention.

As shown in fig. 1 to 9, the drill 100 includes a housing 11, a motor 12, an output assembly 13 and a transmission 14. Wherein the motor 12 comprises a drive shaft 121 rotating about a first axis 101. In the present embodiment, the motor 12 is specifically provided as a motor, and the motor 12 will be replaced with the motor hereinafter, but this is not intended as a limitation of the present application. In the present embodiment, the motor 12 includes a stator assembly 122 and a rotor assembly 123. The rotor assembly 123 forms or is coupled to a drive shaft 121 that rotates about the first axis 101. In this embodiment, the motor 12 is an inner rotor brushless motor. In other alternative embodiments, the motor 12 is an external rotor brushless motor. For an inner rotor motor, the stator assembly 122 is sleeved outside the rotor assembly 123. For an external rotor motor, the rotor assembly 123 is sleeved outside the stator assembly 122. In the present embodiment, the brushless motor is provided as a three-phase brushless motor. It will be appreciated that the motor is not limited to a three-phase brushless motor, but may be other types of dc motors, without affecting the spirit of the application.

As shown in fig. 1, the housing 11 includes a drive housing 111 for housing the motor and a second housing 112 for housing at least a portion of the output assembly 13. The second housing 112 is connected to the front end of the driving housing 111. In this embodiment, the housing 11 is further formed or connected with a holding portion 114 for user operation, so as to facilitate the user's holding and operation. One end of the grip 114 is connected to the battery pack 30.

The output assembly 13 is used to drive a working accessory to perform the function of a hand-held power tool. In this embodiment, the output assembly 13 includes an output shaft 131. The output shaft 131 is configured to output power, and the output shaft 131 rotates about the output axis 104. The front end of the output shaft 131 is provided with a clamping part 132, which can clamp corresponding working accessories such as a drill bit, a screwdriver, a sleeve and the like when different functions are realized, and the clamping part 132 is a quick-detachable clamping part. As shown in fig. 12, in some embodiments, when the hand-held power tool is another type of drill, the gripping portion 132' at the front end of the output shaft 131 is a multi-jaw type gripping chuck structure. It should be noted that the clamping portion 132 and the clamping portion 132' are conventional structures, and therefore, the detailed description thereof is omitted for the sake of brevity and without limitation.

As shown in fig. 7-9, a transmission mechanism 14, such as a high-speed and high-torque output tool like a screwdriver or a drill, is connected between the output assembly 13 and the motor 12. The transmission mechanism 14 is used for connecting the driving shaft 121 with the output shaft 131. The transmission 14 is configured as a drive shaft 141 that itself defines the second axis 102, the drive shaft 141 being connected to the output shaft 131. In this embodiment, the transmission 14 is a reduction gear system. Alternatively, the transmission 14 includes planetary gear sets 142 for deceleration, and the number of planetary gear sets 142 may be one or more. The planetary gear set 142 converts the output rotational speed of the motor 12 in a gear ratio to achieve the appropriate torque. In this embodiment, a sun gear is formed on or connected to the drive shaft 121, and the planetary gear meshes with the sun gear. The drive shaft 141 is disposed on the planet carrier closest to the side of the output shaft 131, and it is understood that the drive shaft 141 is the torque output end of the transmission mechanism 14, and the torque or speed on the drive shaft 141 is the final torque or speed of the drive shaft 121 after the speed reduction and torque increase process of the transmission mechanism 14.

In some alternative embodiments, the transmission 14 further includes an impact assembly, such as an impact wrench, impact drill, or electric hammer, that applies an impact force to the output shaft 131. Alternatively, the drive shaft 141 is now the impact force output shaft of the impact assembly, i.e. the drive shaft 141 is the impact force output of the drive mechanism 14.

In this embodiment, the first axis 101 coincides with the second axis 102. In other alternative embodiments, the second axis 102 is disposed at an angle to the first axis 101. In other alternative embodiments, the second axis 102 and the output axis 104 are disposed parallel to each other but not coincident.

The transmission 14 also includes a shift assembly 143 to achieve multi-speed output through multiple sets of gears of different gear ratios. Since the principle of operation of planetary gear reduction and the resulting reduction by such a transmission 14 is well known to those skilled in the art, a detailed description is omitted herein for the sake of brevity.

The gear shifting assembly 143 includes a speed adjusting knob 1431, the speed adjusting knob 1431 is disposed on the driving housing 111 or the second housing 112, and the speed adjusting knob 1431 can realize multi-gear output through multiple groups of gears with different transmission ratios.

As shown in fig. 1 to 7, the drill 100 further includes a main switch 161 and a switching section 163. Wherein the main switch 161 is a trigger switch. The trigger switch is provided on the grip 114 for user operation. The rotational speed of the motor 12 is adjusted in accordance with the trigger travel of the trigger switch. In this embodiment, the trigger switch is coupled to the slide rheostat 162, the trigger travel of the trigger switch is different, and the analog signal output by the slide rheostat 162 is different. The trigger switch firing stroke is positively correlated with the duty cycle of the PWM signal of the motor 12, which is positively correlated with the rotational speed of the motor 12. When the trigger stroke of the trigger switch is small, the duty ratio 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 mapping relationship between the trigger travel of the trigger switch and the PWM signal is stored in the impact wrench, and the mapping relationship may be linear or nonlinear, which is not limited by the embodiment of the present application.

The switching part 163 is provided at an upper side of the trigger switch, and the switching part 163 is configured to be operated to set a rotation direction of the motor to a forward rotation direction of fastening fasteners or a reverse rotation direction of unscrewing fasteners.

In the present embodiment, the second housing 112 includes an output housing 113 for supporting rotation of the output shaft 131. As shown in fig. 7 to 9, the output housing 113 is provided with a housing portion 1131. The output shaft 131 is sleeved with a first bearing 115 for supporting the output shaft 131 for rotation about the output axis 104. The housing 1131 is used to mount the first bearing 115. Optionally, the first bearing 115 is a ball bearing, and an inner ring of the ball bearing is connected to the output shaft 131. It will be appreciated that when the motor 12 begins to output power through the drive shaft 121, the output shaft 131 rotates about the output axis 104 relative to the output housing 113 to operate the fastener. Optionally, the first bearing 115 further comprises a sliding bearing, such as an oil-containing bearing. In some embodiments, as shown in fig. 12, for example, 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.

As shown in fig. 1-2, the drill 100 includes a first condition in which the output axis 104 is substantially coaxial with the second axis 102 and a second condition in which the output axis 104 is radially offset from the second axis 102 as shown in fig. 3-5. As shown in fig. 1 to 2, the first state may be understood as a "center" state of the output shaft 131, and the use condition of the conventional fastening type hand-held electric tool is considered. As shown in fig. 3-5, the second state may be understood as a "welt" state in which the output shaft 131 is offset.

As shown in fig. 1 to 4, the output shaft 131 moves relative to the output housing 113 to radially offset the output shaft 131 relative to the first central shaft 105. It will be appreciated that each movement of the output shaft 131 relative to the output housing 113 configures one stop point, each of which is offset relative to the other stop point in a radial direction of the first central shaft 105. The drill 100 is brought into a first state and a second state by relative movement of the output shaft 131 with respect to the output housing 113. In the related art, in general, when the binding function is implemented, an accessory is attached to the output shaft 131, and the output shaft of the accessory and the output shaft 131 of the machine are eccentrically disposed, that is, the output axis of the accessory and the output axis 104 of the machine are radially offset, and the accessory is mounted on the machine under the working condition of needing the binding of the offset output shaft 131. The structure makes the user need additionally carry the annex when the during operation, still need many times during the use with work annex (for example criticize the head) dismouting in order to adapt to welt operating mode and non-welt operating mode on annex and machine body, is unfavorable for work efficiency.

In this embodiment, the output shaft 131 moves relative to the output housing 113 in the radial direction of the first central shaft 105, i.e., the output shaft 131 includes a first position as shown in FIG. 2 and a second position as shown in FIG. 4. In the first position, the output axis 104 is radially spaced from the first central axis 105 by a distance D1. In the second position, the output axis 104 is radially spaced from the first central axis 105 by a distance D2. Wherein D1 is smaller than D2, and D1 is greater than or equal to 0 and less than R, and D2 is greater than or equal to 0 and less than or equal to R when the radial distance between the first central axis 105 and the outer edge of the output housing 113 is defined as R. Thus, when the output shaft 131 is in the first position, the drill 100 is in one of the first state or the first state. When the output shaft 131 is in the second position, the drill 100 is in one of the second state or the second state.

According to the definition of the output housing 113 described above, the output housing 113 is used to support the rotation of the output shaft 131, whereas in the present embodiment, the output housing 113 houses the first bearing 115. Alternatively, the output housing 113 is substantially circular or quasi-circular in projection in the front-rear direction, and the output housing 113 is configured with the first center axis 105 passing through the geometric center. Optionally, the geometric center is a center of the output housing 113, and the first central axis 105 is a central axis of the output housing 113. As shown in fig. 2, 4 and 6, the radial distance between the first central axis 105 and the outer edge of the output housing 113 is R, where R is the radius of the output housing 113 or the radius of the projection surface 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. The radial distance between the first central axis 105 and the outer edge of the output housing 113 is R, and R is not necessarily a constant value. The foregoing does not affect the essence of the application.

By providing an output shaft 131 that is radially movable relative to the output housing 113, it is possible to achieve both a conventional center form and an offset form of the output shaft 131 from the center without the use of accessories. The user can realize the switching and the use of the two states only by adjusting the position of the output shaft 131, and the switching is convenient, so that the working efficiency is improved. No extra accessories are needed to be carried, and the user experience is improved.

By the output shaft 131 being movable relative to the output housing 113 or radially displaceable relative to the first central shaft 105, the output shaft 131 can be adjusted relative to the first central shaft 105 in the range of 0 to R more flexibly.

In some alternative embodiments, the first and second positions of the output shaft 131 correspond to two different off-set welt conditions of the output shaft 131. At this point, it will be appreciated that the drill 100 is in the second state when the output shaft 131 is in both the first and second positions. For such an embodiment, the output shaft 131 may be an accessory output shaft of an accessory product, and the output housing 113 is a housing of the accessory product, so as to implement a welting size that can implement multiple offsets using one accessory product, and apply to multiple welting conditions. The output shaft can be adjusted more flexibly in the range of 0 to R with respect to the first central shaft 105. Therefore, when the first position and the second position of the output shaft 131 correspond to two different welt states, the device is also suitable for products with accessories, and the working efficiency can be improved.

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 disposed parallel to each other but not coincident. In other alternative embodiments, the first central axis 105 is disposed at an angle to the second axis 102.

Alternatively, output shaft 131 rotates about third axis 103 relative to output housing 113. I.e. the output shaft 131 is switched between the first position (fig. 1) and the second position (fig. 3) by rotation about the third axis 103. Wherein the third axis 103 is parallel to the first central axis 105 but offset. Optionally, the third axis 103 is arranged between a first position where the output shaft 131 is located and a second position where the output shaft 131 is located. Of course, in other alternative embodiments, the switching of the first and second positions may be achieved by a radial translational movement or a rotational movement relative to other reference axes.

As shown in fig. 1 to 2, in the first state in which the output axis 104 is substantially coaxial with the second axis 102, the radial distances from the output axis 104 to the outer edges of the two 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. Wherein L1 is less than or equal to L2. In the embodiment of the present application, the electric drill 100 is in the first state, so that the position of the output shaft 131 is substantially the same as that of a conventional electric drill or a tool for outputting torque in rotation, that is, the electric drill 100 can maintain the usage habit and the appearance state of a conventional screwdriver when the electric drill 100 is in the first state. Since the output shaft 131 of a conventional electric drill (i.e., the electric drill 100 not provided with the taping function) is located substantially in the center of the output housing 113, i.e., when the output axis 104 is in the first state substantially coaxial with the second axis 102, the output axis 104 is substantially coaxial with the first center axis 105. It will be appreciated that in the first position, D1 is substantially 0 for the output shaft 131. It will be appreciated that the ratio of the radial distance of the output axis of the output shaft of some conventional electric drills from the outer edges of the output housing in the same radial direction, i.e. L1/L2 is not equal to 1 or is not substantially coaxial, for such electric drill products, the product with output shaft biasing function will not be equal to 1 when the output shaft is in the first position, e.g. the ratio L1/L2 is greater than or equal to 0.4 and less than 1.

In this embodiment, the output shaft 131 is movable relative to the output housing 113 such that the output shaft 131 is either offset relative to the first central axis 105 of the output housing 113 or returned to a position at or relatively near the center of the output housing 113. On the one hand, the appearance and the use habit of the conventional screw driver in the related technology can be maintained. On the one hand, the wobble of the output shaft 131 in the first state can be reduced.

In this embodiment, when the drill 100 is in the second state, the output shaft 131 is radially displaced about the third axis 103 relative to the output housing 113 to the second position, as will be appreciated from the foregoing.

As shown in fig. 4 to 5A-5C, to achieve multi-directional biasing of the drill 100, in this embodiment, the output shaft 131 rotates relative to the drive housing 111 about the first central axis 105 when the output shaft 131 is in the second position. So that the output shaft 131 can accomplish a bias in multiple directions. Alternatively, the output housing 113 rotates relative to the drive housing 111 about the first central axis 105, and the output shaft 131 rotates in synchronization with the output housing 113. Alternatively, the output housing 113 may partially rotate about the first central shaft 105 to drive the output shaft 131 to rotate synchronously. In this embodiment, since the output housing 113 can rotate around the first central shaft 105, when the output shaft 131 is located at the first position, the output shaft 131 can also be driven by the output housing 113 to rotate around the first central shaft 105. In the present embodiment, the second housing 112 and the output housing 113 do not undergo relative movement, that is, the second housing 112 and the output housing 113 rotate synchronously, and 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. Alternatively, the second housing 112 may partially rotate around the first central shaft 105 to drive the output shaft 131 to rotate synchronously. It should be noted that, in the present embodiment, the second housing 112 and the output housing 113 rotate synchronously or are integrally formed, but the geometric center of the output housing is not the same as the geometric center of the second housing due to the appearance molding requirement or other functional requirements. In some embodiments, the second housing 112 is shaped to conform to the output housing 113, so that the geometric centers of the two may be identical. In some embodiments, the hand-held power tool may further include structure to rotationally adjust the torque or output rotational speed, but such a rotating component is not part of the second housing portion because such component rotation does not cause relative position of the output axis with respect to the second axis.

Since the output shaft 131 requires stable connection and driving during operation, i.e., when outputting power, the drill 100 further includes a first locking portion 151 for maintaining the output shaft 131 in either the first or second position, and a second locking assembly 19 for selectively locking rotation of the output housing 113 relative to the drive housing 111. The specific structure of the first locking portion 151 and the second locking assembly 19 will be described in detail below.

As shown in fig. 7 to 11, the 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 coupled state in which the drive shaft 141 is in torque transmission with the output shaft 131 and a decoupled state in which the drive shaft 141 is in driving disengagement with the output shaft 131, the output shaft 131 being permitted to move in a direction perpendicular to the first axis 101 when the clutch assembly 15 is in the decoupled state. Alternatively, 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 between the first position and the second position of the output shaft 131, and the power transmission from the motor to the output shaft 131 can be realized at the first position and the second position after the switching. Wherein the output shaft is in the second position as shown in fig. 9 and 11 and the output shaft is in the first position as shown in fig. 10.

The clutch assembly 15 with the separation state is arranged to enable the output shaft 131 to realize radial displacement and further realize the biasing function, and the connection state is arranged to enable the output shaft 131 to ensure a power transmission path after radial displacement, so that the use function of the electric drill 100 is ensured.

The drill 100 further includes an output drive assembly 18 disposed between the drive shaft 141 and the output shaft 131. As shown in fig. 10, the output drive 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 shown in fig. 10 and 11, the output portion 18b includes a first transmission wheel 181 and a second transmission wheel 182, and the output shaft 131 is selectively coupled with the first transmission wheel 181 or the second transmission wheel 182 to transmit the power of the transmission shaft 141 to the output shaft 131. Through setting up the optional coupling of output shaft 131 with first drive wheel 181 or second drive wheel 182 for output shaft 131 can realize radial displacement, and then realize the biasing function, can make output shaft 131 take place the transmission route of assurance power behind the radial displacement again, guarantee the function of using of electric drill 100.

In this embodiment, the output drive 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 part of the structure. Meanwhile, the output transmission assembly 18 and the clutch assembly 15 can be selectively arranged according to different actual product requirements.

As shown in fig. 9 to 10, the clutch assembly 15 includes a first locking portion 151 and a reset portion 152. Wherein 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 limit portion 1511 corresponding to the first position and a second limit portion 1512 corresponding to the second position, and the output shaft 131 is selectively connected to the first limit portion 1511 or the second limit portion 1512 at the corresponding position. Optionally, the first limiting portion 1511 is located at a first position corresponding to the output shaft 131, and the second limiting portion 1512 is located at a second position corresponding to the output shaft 131. The first limiting portion 1511 and the second limiting portion 1512 are formed or connected to the first mounting frame 153. Optionally, the first spacing portion 1511 includes spacing teeth 154 and the second spacing portion 1512 includes spacing teeth 154 that are identical to the first spacing portion 1511. A limit tooth slot 1311 is formed or connected to the rear end of the output shaft 131 to cooperate with the limit tooth 154. When the output shaft 131 is connected to the first limit portion 1511 or the second limit portion 1512, the limit tooth slot 1311 is connected to the limit tooth 154 to limit the rotational movement of the output shaft 131 relative to the first limit portion 1511 or the second limit portion 1512. It is understood that the positions of the limiting teeth and the limiting tooth slots can be interchanged, which does not affect the essence of the present application. In some embodiments, the output shaft and the limiting portion may be further matched by other mechanical matching structures, so as to achieve circumferential limitation of the limiting portion to the output shaft. In some embodiments, the matching of the output shaft and the limiting portion can be further completed in an electromagnetic manner, so that circumferential limitation of the limiting portion to the output shaft is achieved.

To achieve the position switching of the output shaft 131 with respect to the output housing 113, a first mounting portion 134 is formed or connected to the output shaft 131. The first mounting bracket 153 is provided with a first connecting portion 155 coaxial with the third axis 103. To switch the output shaft 131 between the first position and the second position by rotating about the third axis 103, the first connecting portion 155 is connected to the first mount 153 by a first shaft 1552, and the first shaft 1552 is coaxial with the third axis 103. Alternatively, a first shaft 1552 is provided in the output housing 113, the first shaft 1552 rotatably connecting the first mounting portion 134 with the first mounting frame 153, i.e., the output shaft 131 with the first mounting frame 153. So that the output shaft 131 is connected to the first limit portion 1511 or the second limit portion 1512, respectively. Optionally, the first shaft 1552 is connected between the first limit 1511 and the second limit 1512.

The reset portion 152 is used to drive the clutch assembly 15 to switch from the disengaged state to the engaged state. Alternatively, when the output shaft 131 is separated from the first limit portion 1511 or the second limit portion 1512, the reset portion 152 applies a force that brings the output shaft 131 close to the first limit portion 1511 or the second limit portion 1512. In the present embodiment, the return portion 152 includes a coil spring, and alternatively, the return portion 152 is a compression spring. Alternatively, to stably fix the reset portion 152, one end of the reset portion 152 is connected to the output shaft 131, and one end is connected to the clutch assembly 15. Alternatively, 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 frame 153. Meanwhile, in order to avoid the reset portion 152 from twisting, the reset portion 152 is sleeved on the first shaft 1552.

Taking the example that the output shaft 131 is switched from the first position (fig. 10) to the second position (fig. 9 and 11), when the output shaft 131 is located at the first position, the limiting tooth slot 1311 on the output shaft 131 is engaged with the limiting tooth 154 of the first limiting portion 1511, that is, the output shaft 131 is held in the first limiting portion 1511. At this time, the reset portion 152 is in a state of not applying a force or applies a force to the first stopper portion 1511 to the output shaft 131, so that the axial engagement of the output shaft 131 and the first stopper portion 1511 is more stable. A force away from the first limiting portion 1511 is applied to the output shaft 131 by an external force, and in this embodiment, in order 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, the user pulls the output shaft forward, at which time the reset portion 152 is compressed to store capacity. The output shaft 131 is rotated about the third axis 103 by an external force, and then moved from the first position to the second position, and the output shaft 131 is moved to a position substantially aligned with the second stopper 1512. After the external force is removed, the reset portion 152 releases energy to drive the output shaft 131 to the second limiting portion 1512, so that the output shaft 131 enters the second limiting portion 1512, and the limiting tooth grooves 1311 are meshed with the limiting teeth 154 of the second limiting portion 1512. The position switching of the output shaft 131 is completed.

In the present embodiment, as shown in fig. 10, 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 aligned with the first limit portion 1511 or the second limit portion 1512 more accurately.

As shown in fig. 9, the first mounting portion 134 includes a bearing housing 1341 for accommodating the first bearing 115, and the first mounting portion 134 is accommodated in the accommodating portion 1131 by the output housing 113.

The first driving wheel 181 of the output driving assembly 18 is in driving connection with the first limiting portion 1511, and the second driving wheel 182 is in driving connection with the second limiting portion 1512. Optionally, the axle of the first driving wheel 181 drives the first limiting portion 1511, and the axle of the second driving wheel 182 drives the second limiting portion 1512. Alternatively, when the output shaft 131 is in the first position, the output shaft 131 is coupled with the first drive wheel 181. Alternatively, when the output shaft 131 is in the second position, the output shaft 131 is coupled with the second drive wheel 182.

In this embodiment, the first drive wheel 181 is coaxially coupled with the drive shaft 141 because the output axis 104 is substantially coaxial with the second axis 102 when the output shaft 131 is in the first position. Alternatively, the drive shaft 141 directly drives the first drive wheel 181, that is, the drive shaft 141 acts as an axle for the first drive wheel 181. The axis 181a of the first transmission wheel 181 is the second axis 102. Optionally, output drive assembly 18 includes a wheel carrier 184, wheel carrier 184 for supporting the drive wheel. In this embodiment, the wheel carrier 184 is provided with a wheel axle in the form of a cantilever beam, wherein the first driving wheel 181 is provided with a shaft hole 1841 at a corresponding position, so that the driving shaft 141 passes through the wheel carrier 184 to be connected with the first driving wheel 181. In other alternative embodiments, the first drive wheel 181 is coupled to the wheel carrier 184 via an axle, which in turn is coupled to the drive shaft 141. The second transmission wheel 182 is connected to the wheel carrier 184 via its wheel axle 1842, wherein the first transmission wheel 181 and the second transmission wheel 182 are arranged on a first plane 1844 of the wheel carrier 184, respectively. The axis 181a of the first driving wheel 181 is substantially parallel to the axis 182a of the second driving wheel 182, and the first driving wheel 181 and the second driving wheel 182 rotate in the same direction. So that the output shaft 131 turns the same in the first and second positions. Thus, the output 18b further comprises a third transmission wheel 183, the third transmission wheel 183 being in transmission connection with the first transmission wheel 181 and the second transmission wheel 182, respectively.

When the motor 12 drives the driving shaft 121 to start rotating, the first driving wheel 181 is driven via the driving shaft 141 of the driving mechanism 14. The first driving wheel 181 drives the second driving wheel 182 through the third driving wheel 183, and the second driving wheel 182 moves in the same direction as the first driving wheel 181. In this embodiment, the first driving wheel 181, the third driving wheel 183 and the second driving wheel 182 are respectively cylindrical gears and are externally meshed, and optionally, the first driving wheel 181, the third driving wheel 183 and the second driving wheel 182 are respectively in driving 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 smaller than 1, and the transmission ratio of the third transmission wheel to the second transmission wheel is larger than 1, so that the rotation speeds of the first transmission wheel 181 and the second transmission wheel 182 are ensured to be basically the same. I.e. the first transmission wheel 181 to the second transmission wheel 182 are in transmission connection with a transmission ratio of 1:1 as a whole.

In this embodiment, the axle 1843 of the third drive wheel 183 is disposed parallel to but not coincident with the third axis 103. In other alternative embodiments, the axle 1843 of the third drive wheel 183 is arranged coaxially with the third axis 103.

As shown in fig. 7-9, the output drive assembly 18 and the clutch assembly 15 are at least partially housed in the second housing 112. The second housing 112 rotates relative to the drive housing 111 by rotating the second housing 112 to adjust the relative position of the output axis 104 with respect to the second axis 102. In the present embodiment, the axial length L from the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 56mm or less. Since the clutch assembly 15 and the single-layer gear assembly are adopted in the embodiment to realize the position switching of the output shaft 131 and the guaranteed transmission path, the application realizes the compact structural length of the offset function part of the output shaft 131. Compared to the structure of the related art that is driven by two-stage, or multi-stage, offset gears. The axial dimension is small, and the product structure is compact. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 50mm or less. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is equal to or less than 51mm, 52mm, 53mm, 54mm, 55mm. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 50mm or less. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 45mm or less. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 40mm or less. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 35mm or less. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 30mm or less. In some embodiments, the axial length L of the rear end of the second housing 112 to the end face where the output shaft 131 protrudes is 25mm or less.

In this embodiment, the output drive assembly 18 and the clutch assembly 15 are at least partially housed in the output housing 113. As the output housing 113 rotates about the first central axis 105, the output drive assembly 18 and clutch assembly 15 at least partially rotate with the output housing 113. Alternatively, the first transmission wheel 181 is coaxially connected to the transmission shaft 141, and when the output housing 113 is rotated, the output shaft 131 is rotated with respect to the drive housing 111 about the first central axis 105, and the second transmission wheel 182 and the third transmission wheel 183 are rotated with respect to the drive housing 111 about the first central axis 105. In some embodiments, the output housing is part of the second housing due to molding or other requirements. In some embodiments, the second housing is integrally molded, and the axial length L of the output housing 113 is 56mm or less when the second housing is the output housing. In some embodiments, the axial length L of the output housing 113 is 50mm or less. In some embodiments, the axial length L of the output housing 113 is equal to or less than 51mm, 52mm, 53mm, 54mm, 55mm. In some embodiments, the axial length L of the output housing 113 is 45mm or less. In some embodiments, the axial length L of the output housing 113 is 40mm or less. In some embodiments, the axial length L of the output housing 113 is less than or equal to 35mm. In some embodiments, the axial length L of the output housing 113 is 30mm or less. In some embodiments, the axial length L of the output housing 113 is 25mm or less.

In some alternative embodiments, the output drive assembly 18 and clutch assembly 15 or portions of the output drive assembly 18 and clutch assembly 15 are provided as removable accessory parts to enable one accessory to achieve multiple offset sizes, the second housing or output housing or second housing and output housing being the outer shell of the accessory or the second housing or output housing or second housing and output housing being the outer shell of a portion of the accessory. In such an embodiment, the axial length L of the rear end of the second housing to the end face at the output shaft exit is 56mm or less. In some embodiments, the axial length L of the rear end of the second housing to the end face at the output shaft 1 is 50mm or less. In some embodiments, the axial length L of the rear end of the second housing to the end face at the output shaft output is less than or equal to 51mm, 52mm, 53mm, 54mm, 55mm. In some embodiments, an axial length L of the rear end of the second housing to the end face at the output shaft exit is 50mm or less. In some embodiments, the axial length L of the rear end of the second housing to the end face at the output shaft exit is 45mm or less. In some embodiments, an axial length L of the rear end of the second housing to the end face at the output shaft exit is 40mm or less. In some embodiments, an axial length L of the rear end of the second housing to the end face at the output shaft exit is less than or equal to 35mm. In some embodiments, an axial length L of the rear end of the second housing to the end face at the output shaft exit is 30mm or less. In some embodiments, an axial length L of the rear end of the second housing to the end face at the output shaft exit is 25mm or less.

As shown in fig. 11, the second locking assembly 19 includes a locking ring gear 191 and a sliding portion 192, with an operating member 193 formed or attached to one end of the sliding portion 192, the operating member 193 being located at least partially on the visible surface for being activated for operation. In the present embodiment, the operation member 193 is provided on the drive housing 111. When the second locking assembly 19 locks the rotation of the second housing 112 relative to the drive housing 111, the sliding portion 192 cooperates with the teeth on the locking ring gear 191 to limit the rotation of the second housing 112. Alternatively, the sliding portion 192 is connected to the drive housing 111, and the lock ring gear 191 is provided on the output housing 113, and the lock ring gear 191 rotates with the output housing 113. Optionally, the locking ring gear 191 includes a plurality of teeth 1911 such that the output housing 113 includes a plurality of locked positions such that the drill 100 can be biased in a plurality of directions. The applicable working conditions are more various. The external force drives the sliding portion 192 so that the sliding portion 192 is separated from the teeth portion 1911 of the lock ring gear 191, and the user can rotate the output housing 113. After the external force is removed, the sliding portion 192 slides to be engaged with the tooth portion 1911 by the driving force of the driving portion 194 or the lock ring gear 191 is driven to rotate to be engaged with the sliding portion 192 by the tooth portion 1911 closest to the sliding portion 192. The engagement of the sliding portion 192 with the tooth portion 1911 is more stable when the driving portion 194 applies the driving force, providing a sufficient locking force. Optionally, the driving portion 194 is a spring.

In some alternative embodiments, the operating member 193 may be omitted and the rotational movement of the output housing 113 is accomplished by rotating the output housing 113 to drive the sliding portion 192 to displace to disengage the sliding portion 192 from the locking ring gear 191.

The foregoing has shown and described the basic principles, principal features and advantages of the application. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the application in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the application.

Claims (10)

1. A hand-held power tool comprising:

a motor including a drive shaft rotating about a first axis;

a drive housing for housing at least the motor;

an output shaft including a self-defined output axis about which the output shaft rotates to output power;

The transmission mechanism is used for connecting the driving shaft and 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, wherein 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 the power of the transmission shaft to the output shaft.

2. The hand-held power tool of claim 1, further comprising an output housing for supporting rotation of the output shaft, the output housing configured with a first central axis passing through a geometric center;

The output shaft includes a first position having a radial distance D1 from the output axis to the first central axis and a second position having a radial distance D2 from the output axis to the first central axis.

3. The hand-held power tool of claim 2, wherein the output shaft is coupled with the first drive wheel when the output shaft is in the first position.

4. The hand-held power tool of claim 2, wherein the axes of the first and second drive wheels are disposed substantially parallel, and wherein the first and second drive wheels rotate in the same direction.

5. The hand-held power tool of claim 2, wherein the output further comprises a third drive wheel drivingly connected to the first and second drive wheels, respectively.

6. The hand-held power tool of claim 1, wherein the output shaft forms or has attached thereto a grip for connecting a working member configured to perform the function of the hand-held power tool.

7. The hand-held power tool of claim 2, further comprising a first bearing supporting the output shaft for rotation about an output axis, the output housing being provided with a receptacle for receiving the first bearing.

8. The hand-held power tool of claim 2, wherein the output housing rotates about a first central axis relative to the drive housing.

9. The hand-held power tool of claim 2, wherein the output shaft rotates relative to the output housing about a third axis, the third axis being disposed eccentrically with respect to the first central axis.

10. The hand-held power tool of claim 9, wherein an axis of at least one of the first and second drive wheels is offset from the first central axis, the offset drive wheel rotating about the first central axis relative to the drive housing when the output housing rotates about the first central axis relative to the drive housing.