Power tool

Abstract

The present invention discloses a power tool, comprising: an output member, a prime mover, a housing, a transmission device, and a shifting device; the shifting device includes: a first shifting element, a second shifting element, an operating member, and a connecting member; the first shifting element can be switched between a first position and a second position, the second shifting element can be switched between a third position and a fourth position, the operating member is slidably connected to the housing along a first linear direction and the operating member is rotatably connected to the housing with a central axis as the axis, and the connecting member connects the operating member and the second shifting element; when the operating member slides relative to the housing, the operating member drives the first shifting element to be switched between the first position and the second position and at this time the position of the second shifting element remains fixed; when the operating member rotates relative to the housing, the connecting member drives the second shifting element to be switched between the third position and the fourth position and at this time the position of the first shifting element remains fixed. The power tool has a simple structure and is convenient to operate.

Description

Technical Field

[0001] The present invention relates to a power tool, and more particularly to a shifting device for a power tool. Background Art

[0002] Existing power tools such as electric drills and screwdrivers usually include a gearbox for speed reduction. The gearbox usually has multiple different reduction ratios. Therefore, in order to enable the power tool to have different output speeds, the power tool also includes a shifting device for switching the gearbox between different reduction ratios. However, the existing shifting device has a relatively complex structure. Summary of the Invention

[0003] To solve the deficiencies of the prior art, the purpose of the present invention is to provide a power tool including a shifting device with a relatively simple structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A power tool includes: an output member, a prime mover, a housing, a transmission device, and a shifting device; the output member is used to output power, the prime mover is used to drive the output member, the housing is used to accommodate the prime mover, the transmission device is used to transmit power between the prime mover and the output member, the transmission device has at least four transmission states for enabling the output member to output power differently, and the shifting device is used to drive the transmission device to switch between different transmission states; the shifting device includes: a first shifting element, a second shifting element, an operating member, and a connecting member; the first shifting element can at least switch between a first position and a second position for enabling the transmission device to be in different transmission states, the second shifting element can at least switch between a third position and a fourth position for enabling the transmission device to be in different transmission states, the operating member is for the user to operate, the operating member and the housing form a sliding connection that can slide along a first linear direction and the operating member also forms a rotational connection with the housing that can rotate about a central axis, and the connecting member connects the operating member and the second shifting element; wherein, when the operating member slides relative to the housing, the operating member drives the first shifting element to switch between the first position and the second position and at this time the position of the second shifting element remains fixed; when the operating 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 at this time the position of the first shifting element remains fixed.

[0006] Further, the power tool further includes: a limiting device; the limiting device is used to limit the rotation of the operating member when the operating member slides relative to the housing and limit the sliding of the operating member when the operating member rotates relative to the housing.

[0007] Further, the first shifting element can rotate about a first axis to the first position and the second position; the second shifting element can rotate about a second axis to the third position and the fourth position.

[0008] Further, a first axis about which the first shifting element rotates and a second axis about which the second shifting element rotates are parallel to or coincide with each other.

[0009] Further, the operating member includes: 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 a first position and a second position when the operating member slides and to allow the position of the first shifting element to remain fixed when the operating member rotates, and the second driving portion is connected to the connecting member to drive the connecting member to rotate when the operating member rotates and to allow the position of the connecting member to remain fixed when the operating member slides.

[0010] Further, a first linear direction in which the operating member slides and a central axis direction about which the operating member rotates are parallel to each other; the first driving portion is an arc-shaped groove extending along 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.

[0011] Further, the second driving portion is a protrusion extending along a direction parallel to the first straight line, and the connecting member is formed with a groove into which the protrusion can be inserted; alternatively, the second driving portion is a groove extending along the first straight line, and the connecting member is formed with a protrusion that can be inserted into the groove.

[0012] Further, the connecting member is formed with: a third driving portion; the third driving portion is configured to drive a change in the position of the second shifting element when the connecting member rotates.

[0013] Further, the third driving portion includes an inclined surface extending along a plane that intersects the central axis obliquely, and the second shifting element includes a second driven portion in contact with the inclined surface.

[0014] Further, the power tool includes: a chuck for connecting a drill bit; the chuck is connected to the output member.

[0015] The beneficial effect of the present invention is that: the shifting device has a simple structure and is relatively easy for the user to operate. Description of the Drawings

[0016] Figure 1 is a perspective view of the power tool according to the first embodiment;

[0017] Figure 2 is Figure 1 a cross-sectional view of the power tool in

[0018] Figure 3 is Figure 1 a perspective view of a part of the housing, the transmission device, and the shifting device when the operating member is in the first gear position in

[0019] Figure 4 is Figure 3 a cross-sectional view of the structure shown in

[0020] Figure 5 is Figure 1 A perspective view of a partial housing, a transmission device, and a shifting device when the operating member is in the second gear position;

[0021] Figure 6 is Figure 5 A sectional view of the structure shown;

[0022] Figure 7 is Figure 1 A perspective view of a partial housing, a transmission device, and a shifting device when the operating member is in the third gear position;

[0023] Figure 8 is Figure 7 A sectional view of the structure shown;

[0024] Figure 9 is Figure 1 A perspective view of a partial housing, a transmission device, and a shifting device when the operating member is in the fourth gear position;

[0025] Figure 10 is Figure 9 A sectional view of the structure shown;

[0026] Figure 11 is Figure 3 An exploded view of the structure shown;

[0027] Figure 12 is Figure 4 An exploded view of the device housing and the shifting device;

[0028] Figure 13 is Figure 12 A perspective view of the structure shown from another angle;

[0029] Figure 14 is Figure 4 An exploded view of the shifting device;

[0030] Figure 15 is Figure 14 A perspective view of the structure shown from another angle;

[0031] Figure 16 is Figure 13 An enlarged view of a partial structure;

[0032] Figure 17 A perspective view of the power tool of the second embodiment

[0033] Figure 18 is Figure 17 A sectional view of the power tool;

[0034] Figure 19 is Figure 18Stereogram of the device housing and the shift device in;

[0035] Figure 20 is Figure 19 Stereogram of another perspective of the structure shown;

[0036] Figure 21 is Figure 19 Cross-sectional view of the structure shown;

[0037] Figure 22 is Figure 19 Exploded view of the structure shown;

[0038] Figure 23 is Figure 22 Stereogram of another perspective of the structure shown;

[0039] Figure 24 is Figure 19 Stereogram of the shift device in;

[0040] Figure 25 is Figure 24 Stereogram of the operating member, the first shift element and the second shift element in;

[0041] Figure 26 is Figure 25 Stereogram of the operating member in. Detailed implementation mode

[0042] Figure 1 and Figure 2 The power tool 100 of the first embodiment shown in and includes: a housing 11, a prime mover 12, an output member 13, a transmission device 20 and a shift device 30. The housing 11 is used to accommodate the prime mover 12, the output member 13 and the transmission device 20, and the housing 11 can also form a handle 111 for the user to hold. The prime mover 12 is used to drive the output member 13, and the prime mover 12 can be an electric motor, an engine, etc. In this embodiment, an electric motor is taken as an example. The output member 13 is used to output power, and the output member 13 can specifically be an output shaft. The transmission device 20 is arranged between the prime mover 12 and the output member 13 and is used to realize the transmission of power between the prime mover 12 and the output member 13. The transmission device 20 has multiple transmission states for the output member 13 to output power in different ways. The shift device 30 is used to drive the transmission device 20 to switch between different transmission states, and the shift device 30 includes an operating member 31 for the user to operate at different gears.

[0043] In this embodiment, the power tool 100 is specifically an electric drill. In fact, as long as the tool includes a transmission device 20 that can switch between different transmission states and the shift device 30 included in the present invention, it falls within the scope protected by the present invention.

[0044] Such asFigures 1 to 11 As shown, the prime mover 12 includes or is fixedly connected to a drive shaft 121 for outputting power. The drive shaft 121 can rotate about a central axis 101 relative to the housing 11, and the drive shaft 121 is further formed with drive teeth 121a extending along the direction of the central axis 101.

[0045] The transmission device 20 includes: a device housing 21, a first planetary gear train 22, a second planetary gear train 23, and a third planetary gear train 24. Through these three sets of planetary gear trains, the transmission device 20 can have four different transmission states, so that the output member 13 outputs at different speeds.

[0046] The device housing 21 forms a receiving cavity 211 around the central axis 101, and the first planetary gear train 22, the second planetary gear train 23, and the third planetary gear train 24 are arranged in the receiving cavity 211. The first planetary gear train 22 is used to introduce the power output by the drive shaft 121 into the transmission device 20, the second planetary gear train 23 is used to output the power of the transmission device 20 to the output member 13, and the third planetary gear train 24 is arranged between the first planetary gear train 22 and the second planetary gear train 23.

[0047] The first planetary gear train 22 includes: a first movable member 221, a first planetary gear carrier 222, and a first planetary gear 223. The first movable member 221 is arranged around the central axis 101. The first movable member 221 is fixed relative to the device housing 21 in the circumferential direction around the central axis 101, and the first movable member 221 also forms a sliding connection with the device housing 21 in the direction parallel to the central axis 101. The first planetary gear carrier 222 is arranged in the device housing 21. The first planetary gear carrier 222 can rotate around the central axis 101, that is to say, the first planetary gear carrier 222 is rotatably arranged in the receiving cavity 211 formed by the device housing 21. The number of the first planetary gears 223 is multiple, specifically 3. The three first planetary gears 223 are arranged around the drive shaft 121. The three first planetary gears 223 are rotatably mounted to the first planetary gear carrier 222 through pins. The outer periphery of the first planetary gear carrier 222 is formed with first meshing teeth 222a. The first movable member 221 is formed with first locking teeth 221a that can cooperate with the first meshing teeth 222a to lock the rotation of the first planetary gear carrier 222. The first planetary gear 223 specifically includes: a large planetary gear portion 223a and a small planetary gear portion 223b that are fixedly connected, wherein the large planetary gear portion 223a meshes with the drive teeth 121a on the drive shaft 121, and there is a certain gap between the small planetary gear portion 223b and the drive shaft 121 so that they cannot mesh with each other.

[0048] The third planetary gear train 24 includes: a third movable member 241, third planetary gears 242, and a third planetary gear carrier 243. Among them, the third movable member 241 is specifically a third internal gear ring having third internal teeth 241a formed on its inner circumference. The third movable member 241 is disposed around the central axis 101 and centered on the central axis 101. The third movable member 241 can also rotate about the central axis 101 relative to the device housing 21. A third external tooth 241b is further formed on the outer circumference of the third movable member 241. A second locking tooth 221b capable of cooperating with the third external tooth 241b to lock the rotation of the third movable member 241 relative to the device housing 21 is further formed on the first movable member 221 facing the third movable member 241. The small planetary gear portion 223b of the first planetary gear 223 also meshes with the third internal teeth 241a of the third movable member 241. The third planetary gears 242 mesh with the drive teeth 121a on the drive shaft 121. The number of the third planetary gears 242 is multiple, specifically 3. The 3 third planetary gears 242 are rotatably mounted to the third planetary gear carrier 243 through pins. A third meshing tooth 243a is further formed on the outer circumference of the third planetary gear carrier 243.

[0049] The second planetary gear train 23 includes: a second sun gear 231, second planetary gears 232, a second movable member 233, and a second planetary gear carrier 234. The second sun gear 231 is fixedly connected to the third planetary gear carrier 243. The number of the second planetary gears 232 is multiple, specifically 4. The 4 second planetary gears 232 are rotatably mounted on the second planetary gear carrier 234 through pins, and the second planetary gears 232 are also meshed with the second sun gear 231 respectively. The second movable member 233 is specifically a second internal gear ring having second internal teeth 233a formed on its inner circumference. The second movable member 233 is rotatably arranged in an accommodation cavity 211 formed by the device housing 21 around the central axis 101. Second external teeth 233b are further formed on the outer circumference of the second movable member 233. The second planetary gear carrier 234 is used for mounting the second planetary gears 232, and the second planetary gear carrier 234 also rotates synchronously with the output member 13, so as to output power to the output member 13. The second movable member 233 can be rotatably arranged in the device housing 21 with the central axis 101 as the axis, and the second movable member 233 is also slidably connected to the device housing 21 in a direction parallel to the central axis 101. The transmission device 20 further includes a locking member 25, and the locking member 25 is formed with locking teeth 251 that lock the rotation of the second movable member 233 when meshing with the second external teeth 233b. The third planetary gear carrier 243 and the locking member 25 are arranged at different axial positions. When the second movable member 233 moves in a direction parallel to the central axis 101 to make the second internal teeth 233a mesh with the third meshing teeth 243a, the second movable member 233 rotates synchronously with the third planetary gear carrier 243, and when the second movable member 233 moves in a direction parallel to the central axis 101 to make the second external teeth 233b mesh with the locking teeth 251, the locking member 25 locks the rotation of the second movable member 233.

[0050] Thus, as Figure 3 , Figure 4 and Figure 11 show, when the operating member 31 is operated by the user to be in the first gear position, when the first movable member 221 slides in a direction parallel to the central axis 101 to the first axial position, the first locking teeth 221a mesh with the first meshing teeth 222a to lock the rotation of the first planetary gear carrier 222, and at the same time, the second movable member 233 slides to the third axial position. At this time, the locking teeth 251 of the locking member 25 mesh with the second external teeth 233b, so as to lock the rotation of the second movable member 233. Thus, at this time, the transmission device 20 has a relatively large first transmission ratio, and at this time, the output member 13 will rotate at a relatively low first speed, that is to say, the transmission device 20 is in the first transmission state at this time, and the power tool 100 can output a relatively high torque at this time.

[0051] And as Figure 5 , Figure 6 and Figure 11As shown, when the operating member 31 is operated by the user to be in the second gear position, when the first movable member 221 slides in a direction parallel to the central axis 101 to the second axial position, the second locking tooth 221b meshes with the third external tooth 241b to lock the rotation of the third movable member 241, while the second movable member 233 remains in the third axial position. Thus, at this time, the transmission device 20 has a relative second transmission ratio, and the output member 13 will rotate at a second speed, that is to say, the transmission device 20 is in the second transmission state at this time. Among them, the second transmission ratio of the transmission device 20 is approximately half of the first transmission ratio.

[0052] As Figure 7 , Figure 8 and Figure 11 As shown, when the operating member 31 is operated by the user to be in the third gear position, when the first movable member 221 returns to the first axial position, the rotation of the first planet carrier 222 is locked again. At the same time, the second movable member 233 moves in a direction parallel to the central axis 101 to the fourth axial position, and the second internal tooth 233a of the second movable member 233 meshes with the third meshing tooth 243a to form a synchronous rotation with the third planet carrier 243. Thus, at this time, the transmission device 20 has a third transmission ratio, and the output member 13 will rotate at a third speed, that is to say, the transmission device 20 is in the third transmission state at this time. Among them, the third transmission ratio of the transmission device 20 is less than the second transmission ratio.

[0053] As Figure 9 , Figure 10 and Figure 11 As shown, when the operating member 31 is operated by the user to be in the fourth gear position, the first movable member 221 moves to the second axial position again and the second movable member 233 remains in the fourth axial position. The rotation of the third movable member 241 relative to the device housing 21 is locked again and the second movable member 233 forms a synchronous rotation with the third planet carrier 243. Thus, at this time, the transmission device 20 has a fourth transmission ratio, and the output member 13 will rotate at a fourth speed, that is to say, the transmission device 20 is in the fourth transmission state at this time. Among them, the fourth transmission ratio of the transmission device 20 is half of the third transmission ratio. At this time, the power tool 100 can output a relatively large rotational speed.

[0054] In order to enable the transmission device 20 to switch between different transmission states, the shifting device 30 needs to change the positions of the first movable member 221 and the second movable member 233 in a direction parallel to the central axis 101. Specifically, the shifting device 30 can switch the first movable member 221 between the first axial position and the second axial position and can also switch the second movable member 233 between the third axial position and the fourth axial position.

[0055] AsFigures 11 to 16 As shown in the figure, the shifting device 30 includes the above-mentioned operating member 31, and further includes: a connecting member 32, a first shifting element 33, and a second shifting element 34. Among them, the operating member 31 is used for the user to operate so that the transmission device 20 is in different transmission states. The connecting member 32 connects the operating member 31 and the second shifting element 34. The first shifting element 33 is connected to the first movable member 221, and the second shifting element 34 is connected to the second movable member 233.

[0056] Specifically, the first shifting element 33 and the device housing 21 form a rotational connection that can rotate about the first axis 102, and the first axis 102 is perpendicular to the central axis 101. When the first shifting element 33 rotates relative to the device housing 21 about the first axis 102, it can rotate to a first position and a second position. The first shifting element 33 specifically includes: a first shifting portion 331, a first rotating shaft portion 332, and a first driven portion 333. The first shifting portion 331 is connected to the first movable member 221. When the first shifting element 33 rotates to the first position, the first shifting portion 331 can drive the first movable member 221 to move relative to the device housing 21 to a first axial position in a direction parallel to the central axis 101. When the first shifting element 33 rotates to the second position, the first shifting portion 331 can drive the first movable member 221 to move relative to the device housing 21 to a second axial position in a direction parallel to the central axis 101. Specifically, the first movable member 221 is formed with a first annular groove 221c, and the first shifting portion 331 is inserted into the first annular groove 221c. The first rotating shaft portion 332 serves as the rotation axis point of the first shifting element 33 rotating about the first axis 102. The first driven portion 333 is connected to the operating member 31 and is driven by the operating member 31. The first driven portion 333 and the first shifting portion 331 are disposed on both sides of the first rotating shaft portion 332, and the first driven portion 333 and the first shifting portion 331 are also disposed on both sides of the first axis 102. In this way, when the first driven portion 333 is driven by the operating member 31, the first shifting element 33 can be rotated, so that the first shifting portion 331 drives the first movable member 221 to switch between the first axial position and the second axis 103 position.

[0057] Similarly, the second shifting element 34 and the device housing 21 form a rotational connection that can rotate about the second axis 103, which is perpendicular to the central axis 101 and parallel to the first axis 102. The second shifting element 34 can rotate to a third position and a fourth position when rotating relative to the device housing 21 about the second axis 103. Specifically, the second shifting element 34 includes: a second shifting portion 341, a second rotating shaft portion 342, and a second driven portion 343. The second shifting portion 341 is connected to the second movable member 233. When the second shifting element 34 rotates to the third position, the second shifting portion 341 can drive the second movable member 233 to move relative to the device housing 21 to a third axial position in a direction parallel to the central axis 101, and when the second shifting element 34 rotates to the fourth position, the second shifting portion 341 can drive the second movable member 233 to move relative to the device housing 21 to a fourth axial position in a direction parallel to the central axis 101. Specifically, the second movable member 233 is formed with a second annular groove 233c, and the second shifting portion 341 is inserted into the second annular groove 233c. The second rotating shaft portion 342 serves as the rotation axis point of the second shifting element 34 rotating about the second axis 103. The second driven portion 343 is connected to the connecting member 32 and is driven by the connecting member 32. The second driven portion 343 and the second shifting portion 341 are disposed on both sides of the second rotating shaft portion 342, and the second driven portion 343 and the second shifting portion 341 are also disposed on both sides of the second axis 103. Thus, when the second driven portion 343 is driven by the connecting member 32, the second shifting element 34 can be rotated, so that the second shifting portion 341 drives the second movable member 233 to switch between the third axial position and the fourth axial position.

[0058] The device housing 21 is further formed with a first arc-shaped hole 212 and a second arc-shaped hole 213. The first shifting element 33 passes through the first arc-shaped hole 212, and the first arc-shaped hole 212 is used to guide the rotation of the first shifting element 33 about the first axis 102, and the first shifting portion 331 is located inside the device housing 21. The second shifting element 34 passes through the second arc-shaped hole 213, and the second arc-shaped hole 213 is used to guide the rotation of the second shifting element 34 about the second axis 103, and the second shifting portion 341 is located inside the device housing 21.

[0059] The operating member 31 is at least partially exposed from the housing 11 for the user to operate. The operating member 31 and the housing 11 form a sliding connection that can slide along the direction of the first straight line 104, and the operating member 31 and the housing 11 also form a rotational connection that can rotate about the central axis 101.

[0060] The operating member 31 is formed with a first driving portion 311 connected to the first shifting element 33. When the operating member 31 slides relative to the housing 11 along the direction of the first straight line 104, the first driving portion 311 drives the first shifting element 33 to rotate about the first axis 102 to a first position or a second position, and when the operating member 31 rotates relative to the housing 11 about the central axis 101, the first driving portion 311 can also allow the position of the first shifting element 33 to remain fixed. Specifically, the first driving portion 311 is an arc-shaped groove that extends along the circumferential direction around the central axis 101, and the first driven portion 333 of the first shifting element 33 is embedded in the arc-shaped groove. Thus, when the operating member 31 slides, the arc-shaped groove contacts the first driven portion 333 and drives the first driven portion 333 to change its position in the direction along the first straight line 104, thereby driving the first shifting element 33 to rotate about the first axis 102. When the operating member 31 rotates, the first driven portion 333 can rotate relative to the arc-shaped groove, that is, the first shifting element 33 can allow the arc-shaped groove to rotate relative to the first driven portion 333 while the position is protected and fixed.

[0061] The operating member 31 is further formed with a second driving portion 312, and the second driving portion 312 is connected to the connecting member 32. When the operating member 31 rotates relative to the housing 11 about the central axis 101, the second driving portion 312 drives the connecting member 32 to rotate synchronously with the operating member 31. At the same time, when the operating member 31 slides relative to the housing 11 along the direction of the first straight line 104, the second driving portion 312 can also allow the position of the connecting member 32 to remain fixed. Specifically, the second driving portion 312 is a protrusion 312a extending along a direction parallel to the first straight line 104, and the connecting portion is formed with a groove 321 into which the protrusion 312a can be embedded, and the groove 321 also extends along a direction parallel to the first straight line 104. In this way, when the operating member 31 rotates, it can drive the connecting member 32 to rotate synchronously with the operating member 31, and when the operating member 31 slides, the operating member 31 can slide relative to the connecting member 32 along the direction of the first straight line 104. Of course, it can be understood that in other embodiments, the second driving portion 312 can also be a groove extending along the first straight line 104, and the connecting portion is formed with a protrusion embedded in the groove.

[0062] The connecting member 32 is also connected to the second shifting element 34. When the connecting member 32 rotates synchronously with the operating member 31, the connecting member 32 can drive the second shifting element 34 to switch between the third position and the fourth position, and the position of the first shifting element 33 at this time remains fixed. The connecting member 32 is formed with a third driving portion 322, and the third driving portion 322 is used to drive the second shifting element 34 to rotate to the third position or the fourth position with the second axis 103 as the axis when the connecting member 32 rotates. Specifically, the third driving portion 322 includes an inclined surface 322a, and the inclined surface 322a extends along a plane obliquely intersecting with the central axis 101. The plane where the inclined surface 322a is located also obliquely intersects with the second axis 103, and the second driven portion 343 of the second shifting element 34 contacts the inclined surface 322a. In this way, when the connecting member 32 rotates, the inclined surface 322a can drive the position of the second driven portion 343 to change, thereby driving the second shifting element 34 to rotate with the second axis 103 as the axis. The third driving part 322 further includes: a first straight surface 322b and a second straight surface 322c, and the two ends of the inclined surface 322a are connected to the first straight surface 322b and the second straight surface 322c respectively. In this way, when the second driven part 343 contacts the first straight surface 322b, the second shifting element 34 is in the third axial position. At this time, the user turns the operating member 31 to make the connecting member 32 rotate with the operating member 31 with the central axis 101 as the axis, and then the connecting member 32 rotates to the position where the inclined surface 322a contacts the second driven part 343, and the connecting member 32 drives the second driven part 343 to change its position in the direction parallel to the central axis 101, so that the second shifting element 34 rotates with the second axis 103 as the axis. Finally, the connecting member 32 rotates to the position where the second straight surface 322c contacts the second driven part 343, and the second shifting element 34 also rotates to the fourth axial position.

[0063] like Figure 12 , Figure 13 and Figure 16As shown, the power tool 100 further includes a limiting component 14. The limiting component 14 is configured to limit the rotation of the operating member 31 when the operating member 31 slides relative to the housing 11 and to limit the sliding of the operating member 31 when the operating member 31 rotates relative to the housing 11. The limiting component 14 includes: a first limiting structure for limiting the rotation of the operating member 31 when the operating member 31 slides along the first straight line 104 and a second limiting structure for limiting the sliding of the operating member 31 when the operating member 31 rotates about the central axis 101. The first limiting structure specifically includes: a first limiting surface 141a and a second limiting surface 141b, and the second limiting structure includes a third limiting surface 141c and a fourth limiting surface 141d. Specifically, the limiting component 14 includes a first limiting protrusion 141 formed on the device housing 21 and a second limiting protrusion 142 that cooperates with the first limiting protrusion 141. The first limiting protrusion 141 is generally rectangular. One set of opposite sides of the rectangle forms the first limiting surface 141a and the second limiting surface 141b, and the other set of opposite sides of the rectangle forms the third limiting surface 141c and the fourth limiting surface 141d. The first limiting surface 141a and the second limiting surface 141b are both parallel to the direction of the first straight line 104, and the third limiting surface 141c and the fourth limiting surface 141d are both perpendicular to the direction of the central axis 101. The second limiting protrusion 142 is formed on the operating member 31. The second limiting protrusion 142 is generally cylindrical, and the outer wall of the cylinder can contact the first limiting surface 141a, the second limiting surface 141b, the third limiting surface 141c, and the fourth limiting surface 141d. Thus, when the operating member 31 slides along the first straight line 104, the first limiting surface 141a or the second limiting surface 141b can contact the second limiting protrusion 142 to limit the rotation of the operating member 31, and when the operating member 31 rotates about the central axis 101, the third limiting surface 141c or the fourth limiting surface 141d can contact the second limiting protrusion 142 to limit the sliding of the operating member 31.

[0064] The power tool 100 further includes a holding assembly 15 for holding the transmission 20 in various transmission states. The holding assembly 15 includes a spring 151 and a holding member 152. A hole 313 for accommodating the spring 151 is provided on the operating member 31. The two ends of the spring 151 respectively abut against the operating member 31 and the holding member 152. The holding member 152 can specifically be a copper cap. Four grooves 214 are formed on the device housing 21. The spring 151 biases a part of the copper cap to be embedded into the grooves 214. In this way, when the operating member 31 moves relative to the housing 11 to different gears, the copper cap can move into the corresponding groove 214, so that the transmission 20 can be held in the corresponding transmission state. At the same time, when the copper cap moves to the edge of the groove 214, the spring 151 can bias the copper cap to suddenly be embedded into the groove 214, and the copper cap can also make a clicking sound, thereby improving the user's operating feel. In addition, the spring 151 is biased between the operating member 31 and the device housing 21, and can also play a certain role in damping vibration, so as to avoid the position of the operating member 31 relative to the device housing 21 changing due to vibration after the power tool 100 is started.

[0065] In this embodiment, by switching the shifting device 30, the transmission 20 can be in four different transmission states.

[0066] Figure 17 The power tool 200 shown in the second embodiment includes a housing 51, a prime mover 52 and an output member 53 that are basically the same as those in the first embodiment, and also includes a transmission 60 with the same internal structure as that in the first embodiment. The device housing 61 of the transmission 60 in this embodiment is slightly different from the device housing 61 in the first embodiment. The power tool 200 in this embodiment also includes a shifting device 70 for making the transmission 60 be in four different transmission states. The device housing 61 of the transmission 60 in this embodiment is adapted to the structure of the shifting device 70. It should be noted that the parts of the power tool 100 in the first embodiment that are adapted to this embodiment can all be applied to this embodiment, and will not be elaborated here.

[0067] As Figures 17 to 26 shown, in this embodiment, the device housing 61 is also arranged around the central axis 201. The shifting device 70 specifically includes an operating member 71, a first shifting element 72 and a second shifting element 73. Among them, the operating member 71 is for the user to operate, and a first driving structure 711 capable of driving the first shifting element 72 to rotate and a second driving structure 712 capable of driving the second shifting element 73 to rotate are formed or fixedly connected to the operating member 71.

[0068] The first shifting element 72 and the device housing 61 form a rotational connection that can rotate about the first axis 202. The second shifting element 73 and the device housing 61 form a rotational connection that can rotate about the second axis 203. The first axis 202 and the second axis 203 are parallel to each other, and both the first axis 202 and the second axis 203 are perpendicular to the central axis 201. The first shifting element 72 specifically includes: a first shifting portion 721, a first rotating shaft portion 722, and a first driven portion 723. The first shifting portion 721 and the first driven portion 723 are respectively arranged on both sides of the first rotating shaft portion 722. The first shifting portion 721 is connected to the first movable member 621 to drive the first movable member 621 to move along the direction of the central axis 201 to a first axial position and a second axial position. The first rotating shaft portion 722 serves as the rotation axis point of the first shifting element 72 rotating about the first axis 202. The first driven portion 723 is used to cooperate with the first driving structure 711. The second shifting element 73 specifically includes: a second shifting portion 731, a second rotating shaft portion 732, and a second driven portion 733. The second shifting portion 731 and the second driven portion 733 are respectively arranged on both sides of the second rotating shaft portion 732. The second shifting portion 731 is connected to the second movable member 633 to drive the second movable member 633 to move along the direction of the central axis 201 to a third axial position and a fourth axial position. The second rotating shaft portion 732 serves as the rotation axis point of the second shifting element 73 rotating about the second axis 203. The second driven portion 733 is used to cooperate with the second driving structure 712.

[0069] The device housing 61 further forms a first arc-shaped hole 612 and a second arc-shaped hole 613. The first arc-shaped hole 612 extends along the circumferential direction around the first axis 202, and the second arc-shaped hole 613 extends along the circumferential direction around the second axis 203. The first shifting element 72 passes through the first arc-shaped hole 612, and the second shifting element 73 passes through the second arc-shaped hole 613. Thus, the first arc-shaped hole 612 can guide the first shifting element 72 to rotate about the first axis 202, and the second arc-shaped hole 613 can guide the second shifting element 73 to rotate about the second axis 203.

[0070] Specifically, the first driving structure 711 specifically includes: a first driving inclined surface 711a and a first straight surface 711b. Among them, the plane where the first driving inclined surface 711a is located intersects the first axis 202 obliquely, and the plane where the first driving inclined surface 711a is located also intersects the central axis 201 obliquely. In this way, when the operating member 71 rotates, the first driving inclined surface 711a can drive the first shifting element 72 to rotate to the first position and the second position. Similarly, the second driving structure 712 includes: a second driving inclined surface 712a and a second straight surface 712b. Among them, the plane where the second driving inclined surface 712a is located intersects the second axis 203 obliquely, and the plane where the second driving inclined surface 712a is located also intersects the central axis 201 obliquely. In this way, when the operating member 71 rotates, the second driving inclined surface 712a can drive the second shifting element 73 to rotate to the third position and the fourth position.

[0071] In order to ensure that the first shifting element 72 always remains in contact with the first driving structure 711, the shifting device 70 includes a first biasing element 74, and the first biasing element 74 generates a biasing force that biases the first shifting element 72 into contact with the first driving structure 711. Specifically, a first sliding groove 614 is formed on the device housing 61, and a first slider 615 that contacts the first driven portion 723 of the first shifting element 72 is disposed in the first sliding groove 614. The first slider 615 is slidably disposed in the first sliding groove 614, and the first biasing element 74 biases the first slider 615 so that the first slider 615 supports the first driven portion 723 and enables the first driven portion 723 to always remain in contact with the first driving inclined surface 711a or the first straight surface 711b.

[0072] Similarly, the shifting device 70 includes a second biasing element 75, and the second biasing element 75 generates a biasing force that biases the second shifting element 73 into contact with the second driving structure 712. Specifically, a second sliding groove 616 is formed on the device housing 61, and a second slider 617 that contacts the second driven portion 733 of the second shifting element 73 is disposed in the second sliding groove 616. The second slider 617 is slidably disposed in the second sliding groove 616, and the second biasing element 75 biases the second slider 617 so that the second slider 617 supports the second driven portion 733 and enables the second driven portion 733 to always remain in contact with the second driving inclined surface 712a or the second straight surface 712b.

[0073] Specifically, the first driving structure 711 includes three first driving inclined surfaces 711a and four first straight surfaces 711b, as Figure 26 shown, and they are arranged at intervals in sequence. The second driving structure 712 includes one second driving inclined surface 712a and two second straight surfaces 712b, as Figure 26As shown, the two ends of the second driving inclined surface 712a are respectively connected to the two second straight surfaces 712b. In this way, by setting the corresponding relationship between the first driving structure 711 and the second driving structure 712, the transmission device 60 can be in four different transmission states when the operating member 71 rotates relative to the housing 51.

[0074] In this embodiment, the operating member 71 includes an operating portion 713 and a driving portion 714. The operating portion 713 and the driving portion 714 are two parts, and these two parts are fixedly connected together, so that the stability of the operation can be improved. In fact, as long as the operating portion 713 and the driving portion 714 rotate synchronously, the technical solution of the present invention can be realized. In addition, in other embodiments, the operating portion 713 and the driving portion 714 may also be integrally formed.

[0075] The operating member 71 is further formed with four grooves 715. A spring piece 618 is connected to the device housing 61 and can be inserted into different grooves 715 when the transmission device 60 is in different transmission states. Through the action of the grooves 715 and the spring piece 618, the shifting device 70 can make a clicking sound, thereby improving the user's operating feel. In addition, the spring piece 618 can also play a certain role in vibration damping, so as to avoid the position of the operating member 71 relative to the device housing 61 changing due to vibration after the power tool 200 is started.

[0076] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by using equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A power tool, comprising: An output member for outputting power; A prime mover for driving the output member; A housing for accommodating the prime mover; A transmission device for transmitting power between the prime mover and the output member, the transmission device having at least four transmission states for the output member to output power differently; A shifting device for driving the transmission device to switch between different transmission states; Characterized in that: The shifting device includes: A first shifting element capable of switching at least between a first position and a second position for the transmission device to be in different transmission states; A second shifting element capable of switching at least between a third position and a fourth position for the transmission device to be in different transmission states; An operating member for the user to operate, the operating member and the housing form a sliding connection that can slide along a first linear direction and the operating member also forms a rotational connection with the housing that can rotate about a central axis; A connecting member connecting the operating member and the second shifting element; the connecting member is formed with: a third driving portion for driving the position of the second shifting element to change when the connecting member rotates; the third driving portion includes an inclined surface extending along a plane that intersects the central axis obliquely, and the second shifting element includes a second driven portion in contact with the inclined surface; Wherein, when the operating member slides relative to the housing, the operating member drives the first shifting element to switch between the first position and the second position and at this time the position of the second shifting element remains fixed; when the operating 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 at this time the position of the first shifting element remains fixed.

2. The power tool according to claim 1, characterized in that: The power tool further includes: A limiting device for restricting the rotation of the operating member when the operating member slides relative to the housing and restricting the sliding of the operating member when the operating member rotates relative to the housing.

3. The power tool according to claim 1, characterized in that: The first shifting element can rotate about a first axis to the first position and the second position; the second shifting element can rotate about a second axis to the third position and the fourth position.

4. The power tool according to claim 3, characterized in that: The first axis about which the first shifting element rotates and the second axis about which the second shifting element rotates are parallel to each other or coincide.

5. The power tool according to claim 1, characterized in that: The operating member includes: A first driving portion connecting the first shifting element for driving the first shifting element to switch between the first position and the second position when the operating member slides and allowing the position of the first shifting element to remain fixed when the operating member rotates; A second driving portion connecting the connecting member for driving the connecting member to rotate when the operating member rotates and allowing the position of the connecting member to remain fixed when the operating member slides.

6. The power tool according to claim 5, wherein: The first linear direction in which the operating member slides is parallel to the direction of the central axis about which the operating member rotates; The first driving portion is an arc-shaped groove extending in the circumferential direction around the central axis, and the first shifting element includes a first driven portion that at least partially extends into the arc-shaped groove.

7. The power tool according to claim 6, wherein: The second driving portion is a protrusion extending in a direction parallel to the first straight line, and the connecting member is formed with a groove into which the protrusion can be inserted; alternatively, the second driving portion is a groove extending in the direction of the first straight line, and the connecting member is formed with a protrusion that can be inserted into the groove.

8. The power tool according to claim 1, wherein: The power tool includes: A chuck for connecting a drill bit; The chuck is connected to the output member.

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