Power tool

A power tool, including an output member, a motor, a housing, a transmission device, and a shifting device. The shifting device includes a first shifting element, a second shifting element, an operation member, and a connecting member. The first shifting element is capable of switching between a first position and a second position, and the second shifting element is capable of switching between a third position and a fourth position. When sliding relative to the housing, the operation member drives the first shifting element to switch between the first position and the second position, and a position of the second shifting element remains unchanged. When the operation member rotates relative to the housing, the connecting member drives the second shifting element to switch between the third position and the fourth position, and a position of the first shifting element remains unchanged.

RELATED APPLICATION INFORMATION

This application claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. CN 201711224500.3, filed on Nov. 29, 2017, and Chinese Patent Application No. CN 201711224535.4, filed on Nov. 29, 2017, both of which are incorporated by reference in their entirety herein.

TECHNICAL FIELD

The following generally relates to a power tool, and specifically, to a shifting device of a power tool.

RELATED ART

Existing power tools such as electric drills and screwdrivers generally include gearboxes for deceleration. The gearbox generally has a plurality of different reduction ratios. Therefore, to enable the power tool to have different output rotation speeds, the power tool further includes a shifting device used by the gearbox to switch between different reduction ratios. However, existing shifting devices have a relatively complex structure.

SUMMARY

In one aspect of the disclosure, a power tool includes an output member, a motor, a housing, a transmission device, and a shifting device. The output member is configured to transmit power. The motor is configured to drive the output member. The housing is configured to accommodate the motor. The transmission device is configured to transmit power between the motor and the output member, and the transmission device has at least four transmission states in which the output member is capable of outputting different power. The shifting device is configured to drive the transmission device to switch between the different transmission states, and the shifting device includes a first shifting element, a second shifting element, an operation member, and a connecting member. The first shifting element is capable of switching between at least a first position and a second position in which the transmission device is in different transmission states, and the second shifting element is capable of switching between at least a third position and a fourth position in which the transmission device is in different transmission states. The operation member is operated by a user. The operation member can slide relative to the housing in a first straight line and rotate relative to the housing about a central axis. The connecting member connects the operation member to the second shifting element. When sliding relative to the housing, the operation member drives the first shifting element to switch between the first position and the second position, and in this case, a position of the second shifting element remains unchanged. When the operation member rotates relative to the housing, the connecting member drives the second shifting element to switch between the third position and the fourth position, and in this case, a position of the first shifting element remains unchanged.

Further, the power tool may include a limiting device configured to limit rotation of the operation member when the operation member slides relative to the housing and limit sliding of the operation member when the operation member rotates relative to the housing.

Further, the first shifting element may be capable of rotating to the first position and the second position by using a first axis as an axis, and the second shifting element may be capable of rotating to the third position and the fourth position by using a second axis as an axis.

Further, the first axis of rotation of the first shifting element may be parallel to or overlap the second axis of rotation of the second shifting element.

Further, the operation member may include a first driving portion and a second driving portion. The first driving portion is connected to the first shifting element to drive the first shifting element to switch between the first position and the second position when the operation member slides and allow the position of the first shifting element to remain unchanged when the operation member rotates. The second driving portion is connected to the connecting member to drive the connecting member to rotate when the operation member rotates and allow a position of the connecting member to remain unchanged when the operation member slides.

Further, the first straight line in which the operation member slides may be parallel to the central axis of rotation of the operation member. The first driving portion may be an arc-shaped groove extending in a circumferential direction around the central axis, and the first shifting element includes a first driven portion at least partially extending into the arc-shaped groove.

Further, the second driving portion may be a bump extending in a direction parallel to the first straight line, and the connecting member is formed with a recess into which the bump can be embedded. The second driving portion may also be a recess extending in the direction of the first straight line and the connecting member is formed with a bump that can be embedded into the recess.

Further, the connecting member may be formed with a third driving portion, configured to drive the position of the second shifting element to change when the connecting member rotates.

Further, the third driving portion may include an inclined surface extending along a plane obliquely intersecting with the central axis, and the second shifting element may include a second driven portion in contact with the inclined surface.

Further, the power tool may include a chuck configured to connect to a drill. The chuck is connected to the output member.

In another aspect of the disclosure, an power tool includes an output shaft configured to output power, a motor including or connected to a drive shaft, a housing configured to accommodate the motor, a transmission device configured to transmit power between the output shaft and the drive shaft and having at least two different transmission states in which the output shaft outputs power at different rotation speed, and a shifting device configured to drive the transmission device to switch between the different transmission states. The transmission device includes a first movable member disposed around a central axis, and a device housing formed with an accommodation cavity used for accommodating the first movable member. The first movable member and the device housing constitute a slidable connection in a direction parallel to the central axis. The shifting device includes a first shifting element capable of sliding relative to the device housing and driving the first movable member to slide when moving relative to the device housing and an operation member operated by a user and capable of moving relative to the housing. The operation member is further formed with or connected to a first driving structure, including a first driving inclined surface in contact with the first shifting element, for driving the first shifting element to move when the operation member moves relative to the housing.

Further, the operation member and the housing may constitute a rotatable connection using the central axis as an axis, and a plane in which the first driving inclined surface lies obliquely intersects with the central axis.

Further, the first shifting element and the device housing may constitute a rotatable connection using a first axis as an axis, and a plane in which the first driving inclined surface lies obliquely intersects with the first axis.

Further, the operation member and the housing may constitute a rotatable connection using the central axis as an axis, and the first axis of rotation of the first shifting element relative to the device housing is perpendicular to the central axis.

Further, the transmission device may be formed with a first arc-shaped hole extending in a circumferential direction around the first axis, and the first shifting element may run through the first arc-shaped hole.

Further, the first shifting element may include a first shifting portion connected to the first movable member; a first rotation shaft portion being a rotation axis point of the rotatable connection constituted by the first shifting element and the device housing, and a first driven portion configured to come into contact with the first driving structure to be driven by the first driving structure. The first shifting portion and the first driven portion may be respectively disposed on two sides of the first rotation shaft portion.

Further, the shifting device may include a first biasing element for generating a biasing force causing the first shifting element and the first driving structure to remain in contact with each other.

Further, the first driving structure may include a first vertical surface connected to the first driving inclined surface and the first vertical surface obliquely intersects with the first driving inclined surface.

Further, the transmission device may include a second movable member disposed around the central axis. The second movable member and the device housing constitute a slidable connection in a direction parallel to the central axis. The shifting device includes a second shifting element, for constituting a movable connection with the device housing and driving the second movable member to slide when moving relative to the device housing. The operation member is further formed with or connected to a second driving structure, including a second driving inclined surface in contact with the second shifting element and driving the second shifting element to move when the operation member moves relative to the housing.

Further, the power tool may include a chuck configured to connect to a drill. The chuck is connected to the output shaft.

In view of the foregoing, it will be appreciated that the shifting device has a simple structure that allows a user to perform a shifting operation easily.

DETAILED DESCRIPTION

An example power tool100, shown inFIG. 1andFIG. 2, includes a housing11, a motor12, an output member13, a transmission device20, and a shifting device30. The housing11is configured to accommodate the motor12, the output member13, and the transmission device20. The housing11may further form a handle111held by a user. The motor12is configured to drive the output member13. The output member13is configured to output power, and may specifically be an output shaft. The transmission device20is disposed between the motor12and the output member13, and is configured to transmit power between the motor12and the output member13. The transmission device20has a plurality of transmission states in which the output member13can output different power. The shifting device30is configured to drive the transmission device20to switch between the different transmission states, and the shifting device30includes an operation member31that is operated by the user to be at different gears.

In this example the power tool100is specifically illustrated and described as being an electric drill. Actually, any tool that includes the transmission device20capable of switching between different transmission states and the shifting device30is intended to fall within the protective scope of the appended claims.

As shown inFIG. 1toFIG. 11, the motor12includes or is fixedly connected to a drive shaft121configured to output power. The drive shaft121can rotate relative to the housing11by using a central axis101as an axis, and the drive shaft121is further formed with drive teeth121aextending in a direction of the central axis101.

The transmission device20includes a device housing21, a first planetary gear system22, a second planetary gear system23, and a third planetary gear system24. The transmission device20can have four different transmission states by using the three planetary gear systems, so that the output member13outputs power at different rotation speeds.

The device housing21forms an accommodation cavity211around the central axis101, and the first planetary gear system22, the second planetary gear system23, and the third planetary gear system24are disposed in the accommodation cavity211. The first planetary gear system22is configured to introduce, into the transmission device20, power output by the drive shaft121. The second planetary gear system23is configured to output power of the transmission device20to the output member13. The third planetary gear system24is disposed between the first planetary gear system22and the second planetary gear system23.

The first planetary gear system22includes a first movable member221, a first planet carrier222, and a first planet gear223. The first movable member221is disposed around the central axis101, and is fixed relative to the device housing21in a circumferential direction around the central axis101. The first movable member221further constitutes a slidable connection with the device housing21in a direction parallel to the central axis101. The first planet carrier222is disposed in the device housing21, and can rotate about the central axis101, that is, the first planet carrier222is rotatably disposed in the accommodation cavity211formed by the device housing21. There is a plurality of first planet gears223, and specifically, there may be three first planet gears223. The three first planet gears223are disposed around the drive shaft121. The three first planet gears223are rotatably mounted to the first planet carrier222by using a pin. First engaged teeth222aare formed on the periphery of the first planet carrier222. The first movable member221is formed with first locking teeth221acapable of cooperating with the first engaged teeth222ato lock rotation of the first planet carrier222. The first planet gear223specifically includes a large planet gear portion223aand a small planet gear portion223bthat are fixedly connected. The large planet gear portion223ais engaged with the drive teeth121aon the drive shaft121, and there is a gap between the small planet gear portion223band the drive shaft121, so that the small planet gear portion223band the drive shaft121cannot be engaged with each other.

The third planetary gear system24includes a third movable member241, a third planet gear242, and a third planet carrier243. The third movable member241is specifically a third inner ring gear on an inner periphery of which third inner teeth241aare formed. The third movable member241is disposed around the central axis101and is centered about the central axis101. The third movable member241can further rotate relative to the device housing21by using the central axis101as an axis. Third outer teeth241bare further formed on an outer periphery of the third movable member241. Second locking teeth221bcapable of cooperating with the third outer teeth241bto lock rotation of the third movable member241relative to the device housing21are further formed on a part of the first movable member221that faces the third movable member241. The small planet gear portion223bof the first planet gear223is further engaged with the third inner teeth241aof the third movable member241. The third planet gear242is engaged with the drive teeth121aon the drive shaft121. There is a plurality of third planet gears242. Specifically, there may be three third planet gears242. The three third planet gears242are rotatably mounted to the third planet carrier243by using a pin, and third engaged teeth243aare further formed on an outer periphery of the third planet carrier243.

The second planetary gear system23includes a second sun gear231, a second planet gear232, a second movable member233, and a second planet carrier234. The second sun gear231is fixedly connected to the third planet carrier243. There is a plurality of second planet gears232. Specifically, there may be four second planet gears232. The four second planet gears232are rotatably mounted to the second planet carrier234by using a pin, and the second planet gears232are further separately engaged with the second sun gear231. The second movable member233is specifically a second inner ring gear on an inner periphery of which second inner teeth233aare formed, and the second movable member233is rotatably disposed around the central axis101in the accommodation cavity211formed by the device housing21. Second outer teeth233bare further formed on an outer periphery of the second movable member233. The second planet carrier234is configured to mount the second planet gear232, and the second planet carrier234further synchronously rotate with the output member13to output power to the output member13. The second movable member233may be rotatably disposed in the device housing21by using the central axis101as an axis. The second movable member233and the device housing21further constitute a slidable connection in the direction parallel to the central axis101. The transmission device20further includes a locking member25. The locking member25is formed with locking teeth251for locking rotation of the second movable member233when the locking member25is engaged with the second outer teeth233b. The third planet carrier243and the locking member25are disposed in different axial positions. When moving to the second inner teeth233ain the direction parallel to the central axis101to be engaged with the third engaged teeth243a, the second movable member233synchronously rotates with the third planet carrier243. When the second movable member233moves to the second outer teeth233bin the direction parallel to the central axis101to be engaged with the locking teeth251, the locking member25locks rotation of the second movable member233.

As shown inFIG. 3,FIG. 4, andFIG. 11, when the operation member31is operated by the user to be located in a first-gear position, and the first movable member221slides to a first axial position in the direction parallel to the central axis101, the first locking teeth221aare engaged with the first engaged teeth222ato lock rotation of the first planet carrier222, and the second movable member233slides to a third axial position. In this way, the locking teeth251of the locking member25are engaged with the second outer teeth233bto lock rotation of the second movable member233. In this case, the transmission device20has a relatively large first transmission ratio, and the output member13rotates at a relatively low first speed. That is, the transmission device20in this case is in a first transmission state, and the power tool100can output a relatively large torsion force.

As shown inFIG. 5,FIG. 6, andFIG. 11, when the operation member31is operated by the user to be located in a second-gear position, and the first movable member221slides to a second axial position in the direction parallel to the central axis101, the second locking teeth221bare engaged with the third outer teeth241bto lock rotation of the third movable member241, and the second movable member233remains in the third axial position. In this case, the transmission device20has a second transmission ratio, and the output member13rotates at a second speed. That is, the transmission device20in this case is in a second transmission state, and the second transmission ratio of the transmission device20is approximately half the first transmission ratio.

As shown inFIG. 7,FIG. 8, andFIG. 11, when the operation member31is operated by the user to be located in a third-gear position, and the first movable member221returns back to the first axial position, rotation of the first planet carrier222is locked again, and the second movable member233moves to a fourth axial position in the direction parallel to the central axis101. The second inner teeth233aof the second movable member233are engaged with the third engaged teeth243a, so that the second movable member233synchronously rotates with the third planet carrier243. In this case, the transmission device20has a third transmission ratio, and the output member13rotates at a third speed. That is, the transmission device20in this case is in a third transmission state, and the third transmission ratio of the transmission device20is less than the second transmission ratio.

As shown inFIG. 9,FIG. 10, andFIG. 11, when the operation member31is operated by the user to be located in a fourth-gear position, the first movable member221moves to the second axial position again and the second movable member233remains in the fourth axial position. Rotation of the third movable member241relative to the device housing21is locked again, and the second movable member233synchronously rotates with the third planet carrier243. In this case, the transmission device20has a fourth transmission ratio, and the output member13rotates at a fourth speed. That is, the transmission device20in this case is in a fourth transmission state, and the fourth transmission ratio of the transmission device20is half the third transmission ratio. In this case, the power tool100can output at a relatively large rotation speed.

To enable the transmission device20to switch between different transmission states, the shifting device30needs to cause a change in positions of the first movable member221and the second movable member233in the direction parallel to the central axis101. Specifically, the shifting device30can enable the first movable member221to switch between the first axial position and the second axial position and can further enable the second movable member233to switch between the third axial position and the fourth axial position.

As shown inFIG. 11toFIG. 16, the shifting device30includes the foregoing operation member31, and further includes a connecting member32, a first shifting element33, and a second shifting element34. The operation member31is operated by the user to cause the transmission device20to be in different transmission states. The connecting member32connects the operation member31to the second shifting element34, the first shifting element33is connected to the first movable member221, and the second shifting element34is connected to the second movable member233.

Specifically, the first shifting element33and the device housing21constitute a rotatable connection using a first axis102as an axis, and the first axis102is perpendicular to the central axis101. The first shifting element33can rotate to a first position and a second position when rotating relative to the device housing21by using the first axis102as an axis. The first shifting element33specifically includes a first shifting portion331, a first rotation shaft portion332, and a first driven portion333. The first shifting portion331is connected to the first movable member221. When the first shifting element33rotates to the first position, the first shifting portion331can drive the first movable member221to move to the first axial position relative to the device housing21in the direction parallel to the central axis101. When the first shifting element33rotates to the second position, the first shifting portion331can drive the first movable member221to move to the second axial position relative to the device housing21in the direction parallel to the central axis101. Specifically, a first annular groove221cis formed in the first movable member221, and the first shifting portion331is inserted into the first annular groove221c. The first rotation shaft portion332is used as a rotation axis point of rotation of the first shifting element33by using the first axis102as an axis. The first driven portion333is connected to the operation member31and is driven by the operation member31. The first driven portion333and the first shifting portion331are disposed on two sides of the first rotation shaft portion332, and are further disposed on two sides of the first axis102. In this way, the first driven portion333can enable the first shifting element33to rotate when the first driven portion333is driven by the operation member31, so that the first shifting portion331drives the first movable member221to switch between the first axial position and a the second axial position103.

Similarly, the second shifting element34and the device housing21constitute a rotatable connection using a second axis103as an axis. The second axis103is perpendicular to the central axis101, and the second axis103is parallel to the first axis102. The second shifting element34can rotate to a third position and a fourth position when rotating relative to the device housing21by using the second axis103as an axis. The second shifting element34specifically includes a second shifting portion341, a second rotation shaft portion342, and a second driven portion343. The second shifting portion341is connected to the second movable member233. When the second shifting element34rotates to the third position, the second shifting portion341can drive the second movable member233to move to the third axial position relative to the device housing21in the direction parallel to the central axis101. When the second shifting element34rotates to the fourth position, the second shifting portion341can drive the second movable member233to move to the fourth axial position relative to the device housing21in the direction parallel to the central axis101. Specifically, a second annular groove233cis formed in the second movable member233, and the second shifting portion341is inserted into the second annular groove233c. The second rotation shaft portion342is used as a rotation axis point of rotation of the second shifting element34by using the second axis103as an axis. The second driven portion343is connected to the connecting member32and is driven by the connecting member32. The second driven portion343and the second shifting portion341are disposed on two sides of the second rotation shaft portion342, and are further disposed on two sides of the second axis103. In this way, the second driven portion343can enable the second shifting element34to rotate when the second driven portion343is driven by the connecting member32, so that the second shifting portion341drives the second movable member233to switch between the third axial position and the fourth axial position.

A first arc-shaped hole212and a second arc-shaped hole213are further formed on the device housing21. The first shifting element33runs through the first arc-shaped hole212, the first arc-shaped hole212is used for guiding rotation of the first shifting element33by using the first axis102as an axis, and the first shifting portion331is located in the device housing21. The second shifting element34runs through the second arc-shaped hole213, the second arc-shaped hole213is used for guiding rotation of the second shifting element34by using the second axis103as an axis, and the second shifting portion341is located in the device housing21.

At least a part of the operation member31is exposed out of the housing11to be operated by the user. The operation member31can slide relative to the housing11in a first straight line104, and further constitute a rotatable connection using the central axis101as an axis.

The operation member31is formed with a first driving portion311connected to the first shifting element33. When the operation member31slides relative to the housing11in the direction of the first straight line104, the first driving portion311drives the first shifting element33to rotate to the first position or the second position by using the first axis102as an axis. In addition, when the operation member31rotates relative to the housing11by using the central axis101as an axis, the first driving portion311can further allow the position of the first shifting element33to remain unchanged. Specifically, the first driving portion311is an arc-shaped groove, and the arc-shaped groove extends in a circumferential direction around the central axis101. The first driven portion333of the first shifting element33is embedded into the arc-shaped groove. In this way, when the operation member31slides, the arc-shaped groove comes into contact with the first driven portion333and drives the first driven portion333to change in position in the direction of the first straight line104, thereby driving the first shifting element33to rotate by using the first axis102as an axis. When the operation member31rotates, the first driven portion333can rotate relative to the arc-shaped groove. That is, the first shifting element33can allow the arc-shaped groove to rotate relative to the first driven portion333when the position remains unchanged.

The operation member31is further formed with a second driving portion312, and the second driving portion312is connected to the connecting member32. When the operation member31rotates relative to the housing11by using the central axis101as an axis, the second driving portion312drives the connecting member32to synchronously rotate with the operation member31. When the operation member31slides relative to the housing11in the direction of the first straight line104, the second driving portion312can further allow a position of the connecting member32to remain unchanged. Specifically, the second driving portion312is a bump312aextending in the direction parallel to the first straight line104. A connecting member32is formed with a recess321into which the bump312acan be embedded, and the recess321also extends in the direction parallel to the first straight line104. In this way, when rotating, the operation member31can drive the connecting member32to synchronously rotate with the operation member31. In addition, when sliding, the operation member31can rotate relative to the connecting member32in the direction of the first straight line104. Certainly, it can be understood that in another examples, the second driving portion312may alternatively be a recess extending in the direction of the first straight line104, and the connecting member32is formed with a bump embedded into the recess.

The connecting member32is further connected to the second shifting element34. When synchronously rotating with the operation member31, the connecting member32can drive the second shifting element34to switch between the third position and the fourth position, and the position of the first shifting element33in this case remains unchanged. The connecting member32is formed with a third driving portion322. The third driving portion322is configured to drive the second shifting element34to rotate to the third position or the fourth position by using the second axis103as an axis when the connecting member32rotates. Specifically, the third driving portion322includes an inclined surface322a. The inclined surface322aextends along a plane obliquely intersecting with the central axis101. A plane in which the inclined surface322alies further intersects with the second axis103, and the second driven portion343of the second shifting element34comes into contact with the inclined surface322a. In this way, when the connecting member32rotates, the inclined surface322acan drive a position of the second driven portion343to change, thereby driving the second shifting element34to rotate by using the second axis103as an axis. The third driving portion322further includes a first vertical surface322band a second vertical surface322c. Two ends of the inclined surface322aare respectively connected to the first vertical surface322band the second vertical surface322c. In this way, when the second driven portion343comes into contact with the first vertical surface322b, the second shifting element34is in the third position. In this case, the user toggles the operation member31, so that the connecting member32rotates together with the operation member31by using the central axis101as an axis. Then, the connecting member32rotates to a position in which the inclined surface322acomes into contact with the second driven portion343, and the connecting member32drives the second driven portion343to change in position in the direction parallel to the central axis101, so that the second shifting element34rotates by using the second axis103as an axis. At last, the connecting member32rotates to a position in which the second vertical surface322ccomes into contact with the second driven portion343. In this case, the second shifting element34also rotates to the fourth position.

As shown inFIG. 12,FIG. 13, andFIG. 16, the power tool100further includes a limiting assembly14. The limiting assembly14is configured to limit rotation of the operation member31when the operation member31slides relative to the housing11and limit sliding of the operation member31when the operation member31rotates relative to the housing11. The limiting assembly14includes a first limiting structure configured to limit rotation of the operation member31when the operation member31slides along the first straight line104and a second limiting structure configured to limit sliding of the operation member31when the operation member31rotates by using the central axis101as an axis. The first limiting structure specifically includes a first limiting surface141aand a second limiting surface141b. The second limiting structure includes a third limiting surface141cand a fourth limiting surface141d. Specifically, the limiting assembly14includes a first limiting bump141formed on the device housing21and a second limiting bump142cooperating with the first limiting bump141. The first limiting bump141is approximately a rectangle. A group of opposite sides of the rectangle form the first limiting surface141aand the second limiting surface141b, and the other group of opposite sides of the rectangle form the third limiting surface141cand the fourth limiting surface141d. Both the first limiting surface141aand the second limiting surface141bare parallel to the direction of the first straight line104, and both the third limiting surface141cand the fourth limiting surface141dare perpendicular to the direction of the central axis101. The second limiting bump142is formed on the operation member31, and is approximately a cylinder. An outer wall of the cylinder can come into contact with the first limiting surface141a, the second limiting surface141b, the third limiting surface141c, and the fourth limiting surface141d. Therefore, when the operation member31slides along the first straight line104, the first limiting surface141aor the second limiting surface141bcan come into contact with the second limiting bump142to limit rotation of the operation member31. In addition, when the operation member31rotates by using the central axis101as an axis, the third limiting surface141cor the fourth limiting surface141dcan come into contact with the second limiting bump142to limit sliding of the operation member31.

The power tool100further includes a holding assembly15for holding the transmission device20in each transmission state. The holding assembly15includes a spring151and a holding member152. A hole313used for accommodating the spring151is provided on the operation member31, and two ends of the spring151respectively abut against the operation member31and the holding member152. The holding member152may be specifically a copper cap, four grooves214are formed on the device housing21, and the spring151biases the copper cap to cause the copper cap to be partially embedded into the groove214. In this way, when the operation member31moves relative to the housing11to different gear positions, the copper cap can move into a corresponding groove214, so that the transmission device20can remain in a corresponding transmission state. In addition, when the copper cap moves to an edge of the groove214, the spring151can biases the copper cap to cause the copper cap to be suddenly embedded into the groove214, and the copper cap can further make a click sound, improving the hand feel of the user. In addition, the spring151is disposed between the operation member31and the device housing21in a biasing manner, to play a role of vibration attenuation, so as to prevent the operation member31from changing in position relative to the device housing21due to vibration after the power tool100is enabled.

In this example, the transmission device20can be in four different transmission states through switching of the shifting device30.

A power tool200in a second example shown inFIG. 17includes a housing51, a motor52, and an output member53that have same structures as those in the first example, and further includes a transmission device60having a same internal structure as that in the first example. A device housing61of the transmission device60in this example is slightly different from the device housing61in the first example. The power tool200in this example also includes a shifting device70enabling the transmission device60to be in four different transmission states. The device housing61of the transmission device60in this example matches a structure of the gear shifting apparatus70. It should be noted that each part of the power tool100in the first example adapted to this example may be applied to this example, and details are not specifically described again.

As shown inFIG. 17toFIG. 26, in this example, the device housing61is also disposed around a central axis201. The shifting device70specifically includes an operation member71, a first shifting element72, and a second shifting element73. The operation member71is operated by a user, and the operation member71is formed with or fixedly connected to a first driving structure711capable of driving the first shifting element72to rotate and a second driving structure712capable of driving the second shifting element73to rotate.

The first shifting element72and the device housing61constitute a rotatable connection using a first axis202as an axis, and the second shifting element73and the device housing61constitute a rotatable connection using a second axis203as an axis. The first axis202is parallel to the second axis203, and the first axis202and the second axis203are both perpendicular to the central axis201. The first shifting element72specifically includes a first shifting portion721, a first rotation shaft portion722, and a first driven portion723. The first shifting portion721and the first driven portion723are respectively disposed on two sides of the first rotation shaft portion722. The first shifting portion721is connected to a first movable member621to drive the first movable member621to move to a first axial position and a second axial position in a direction of the central axis201. The first rotation shaft portion722is used as a rotation axis point of rotation of the first shifting element72using the first axis202as an axis. The first driven portion723is configured to cooperate with the first driving structure711. The second shifting element73specifically includes a second shifting portion731, a second rotation shaft portion732, and a second driven portion733. The second shifting portion731and the second driven portion733are respectively disposed on two sides of the second rotation shaft portion732. The second shifting portion731is connected to a second movable member633to drive the second movable member633to move to a third axial position and a fourth axial position in the direction of the central axis201. The second rotation shaft portion732is used as a rotation axis point of rotation of the second shifting element73using the second axis203as an axis. The second driven portion733is configured to cooperate with the second driving structure712.

The device housing61is further formed with a first arc-shaped hole612and a second arc-shaped hole613. The first arc-shaped hole612extends in a circumferential direction around the first axis202, and the second arc-shaped hole613extends in a circumferential direction around the second axis203. The first shifting element72runs through the first arc-shaped hole612, and the second shifting element73runs through the second arc-shaped hole613, so that the first arc-shaped hole612can guide the first shifting element72to rotate by using the first axis202as an axis, and the second arc-shaped hole613can guide the second shifting element73to rotate by using the second axis203as an axis.

Specifically, the first driving structure711specifically includes a first driving inclined surface711aand a first vertical surface711b. A plane in which the first driving inclined surface711alies obliquely intersects with the first axis202, and further obliquely intersects with the central axis201. In this way, when the operation member71rotates, the first driving inclined surface711acan drive the first shifting element72to rotate to a first position and a second position. Similarly, the second driving structure712includes a second driving inclined surface712aand a second vertical surface712b. A plane in which the second driving inclined surface712alies obliquely intersects with the second axis203, and further obliquely intersects with the central axis201. In this way, when the operation member71rotates, the second driving inclined surface712acan drive the second shifting element73to rotate to a third position and a fourth position.

To enable the first shifting element72to always remain in contact with the first driving structure711, the shifting device70includes a first biasing element74. The first biasing element74generates a biasing force for biasing the first shifting element72to come into contact with the first driving structure711. Specifically, a first chute614is formed on the device housing61, and a first sliding block615in contact with the first driven portion723of the first shifting element72is disposed in the first chute614. The first sliding block615is slidably disposed in the first chute614. The first biasing element74biases the first sliding block615, so that the first sliding block615supports the first driven portion723and the first driven portion723always remains in contact with the first driving inclined surface711aor the first vertical surface711b.

Similarly, the shifting device70includes a second biasing element75. The second biasing element75generates a biasing force for biasing the second shifting element73to come into contact with the second driving structure712. Specifically, a second chute616is formed on the device housing61, and a second sliding block617in contact with the second driven portion733of the second shifting element73is disposed in the second chute616. The second sliding block617is slidably disposed in the second chute616. The second biasing element75biases the second sliding block617, so that the second sliding block617supports the second driven portion733and the second driven portion733always remains in contact with the second driving inclined surface712aor the second vertical surface712b.

Specifically, the first driving structure711includes three first driving inclined surfaces711aand four first vertical surfaces711b. As shown inFIG. 26, the three first driving inclined surfaces711aand the four first vertical surfaces711bare sequentially disposed at intervals. The second driving structure712includes one second driving inclined surface712aand two second vertical surfaces712b. As shown inFIG. 26, two ends of the second driving inclined surface712aare respectively connected to the two second vertical surfaces712b. In this way, when the operation member71rotates relative to the housing51, the transmission device60can be in four different transmission states by setting a correspondence between the first driving structure711and the second driving structure712.

In this example, the operation member71includes an operation portion713and a driving portion714. The operation portion713and the driving portion714are two components, and the two components are fixedly connected to each other, thereby improving the operation stability. Actually, the technical solution described herein can be implemented provided that the operation portion713and the driving portion714synchronously rotate. In addition, in another example, the operation portion713and the driving portion714may alternatively be integrated.

The operation member71is further formed with four recesses715, and a spring plate618that can be embedded into different recesses715when the transmission device60is in different transmission states is connected to the device housing61. The shifting device70can make a click sound under action of the recesses715and the spring plate618, to improve the hand feeling of the user. In addition, the spring plate618can further play a role of vibration attenuation, so as to prevent the operation member71from changing in position relative to the device housing61due to vibration after the power tool200is enabled.

The basic principle, main features, and advantages of the subject disclosure are displayed and described above. A person skilled in the art should understand that the foregoing examples do not limit the invention hereinafter claimed in any form, and a technical solution obtained through equivalent replacement or equivalent change falls within the protection scope of the claimed invention.