CN217620417U - Gear shifting device for electric tool - Google Patents

Abstract

The utility model discloses a gear shifting device used on an electric tool, which comprises a knob, a limiting part, a fixed shaft and a clutch, wherein the knob and the limiting part are arranged on a shell and synchronously rotate; a fixed shaft fixedly connected with the shell is arranged in the shell, the fixed shaft is provided with a first shifting fork and a second shifting fork, the first shifting fork comprises a first abutting part and a second abutting part, and the second shifting fork comprises a third abutting part and a fourth abutting part; the fixed shaft is also sleeved with an elastic piece, and the elastic piece is clamped between the second abutting part and the third abutting part; the clutch and the limiting piece are clamped between the second abutting part and the fourth abutting part at the same time, the clutch is installed on the output shaft of the motor, and the limiting piece shifts one of the shifting forks while the other shifting fork pushes the clutch to move; the utility model discloses let first shift fork and second shift fork push away clutch and shift and mutual centre gripping clutch let it stably maintain and keep in corresponding fender position, shift simply and reliably.

Description

Gear shifting device for electric tool

Technical Field

The utility model belongs to the electric tool field, concretely relates to gearshift for electric tool is last.

Background

In building decoration and related industries, an electric hammer is usually used for operation; the common electric hammer is generally provided with a hammer stop, a drill stop and a hammer drill stop, and an operator can frequently switch among the hammer stop, so that the electric hammer is very convenient to use. The gear shifting device of the common electric hammer has more parts which are complex to match with each other, and the gear shifting process is easy to have the phenomenon of blocking; a common shifting tool generally has two clutches and an elastic member for driving the two clutches to move, and a shifting plate is disposed between the elastic member and the clutches. Because each elastic part has the interference of power each other, the elastic part atress is inhomogeneous like this, leads to the separation and reunion to shift gear unsuccessful, and the clutch can block. Meanwhile, the uneven stress of the elastic part can cause the clutch to be separated from the corresponding gear in the use process, and the clutch is difficult to be reliably maintained at the corresponding gear. Therefore, it is desirable to design a gear shifting device that is simple and reliable in structure.

Disclosure of Invention

The utility model discloses a problem to exist among the prior art has designed the gearshift on the electric tool, the utility model discloses a single elastic component removes first shift fork of extrusion contact and second shift fork, lets first shift fork and second shift fork push clutch shift and mutual centre gripping clutch let it stably maintain corresponding fender position, and it is simple and reliable to shift gears.

The invention aims to be realized by the following technical scheme: a gear shifting device for an electric tool comprises a knob, a limiting piece, a fixed shaft and a clutch, wherein the knob and the limiting piece are installed on a shell and rotate synchronously; a fixed shaft fixedly connected with the shell is arranged in the shell, and a first shifting fork and a second shifting fork for pushing the clutch to move are sleeved on the fixed shaft; the first shifting fork and the second shifting fork are sleeved on the fixed shaft, the first shifting fork comprises a first abutting part and a second abutting part, and the second shifting fork comprises a third abutting part and a fourth abutting part; when the clutch is in a corresponding gear, the first abutting part and the third abutting part are mutually attached, an elastic part is further sleeved on the fixed shaft, and the elastic part is clamped between the second abutting part and the third abutting part; the clutch and the limiting part are clamped between the second abutting part and the fourth abutting part at the same time, the clutch is sleeved on the motor output shaft, and the limiting part toggles one of the shifting forks, and the other shifting fork pushes the clutch to move along the motor output shaft.

Preferably, a spline housing which is fixedly connected with the motor output shaft and synchronously rotates with the motor output shaft is arranged in the middle of the motor output shaft, a swing rod bearing and a rotating gear assembly are respectively arranged on two adjacent sides of the spline housing, and the swing rod bearing and the rotating gear assembly are sleeved on the motor output shaft; spline teeth are respectively arranged on the spline housing, the swing rod bearing and the rotating gear assembly, and the spline teeth are also arranged on the inner wall of the clutch and are respectively meshed with the spline housing, the swing rod bearing and the spline teeth on the rotating gear assembly; the clutch moves along the output shaft of the motor, simultaneously, the spline teeth on the clutch are always meshed with the spline teeth on the spline housing, and the spline housing rotates and simultaneously drives the clutch to rotate.

The clutch rotates synchronously with the spline housing, the rotating gear component is driven to rotate when the spline teeth on the clutch are meshed with the spline teeth on the rotating gear component, and the swing rod bearing is driven to rotate when the spline teeth on the clutch are meshed with the spline teeth on the swing rod bearing.

Preferably, a clutch protrusion is arranged on the arc side surface of the clutch, the second abutting part and the fourth abutting part are respectively arranged on two sides of the clutch protrusion, and a gap is formed between each of the second abutting part and the clutch protrusion; the end face of the limiting part facing the clutch is provided with an eccentric bulge, and the eccentric bulge is clamped between the second abutting part and the fourth abutting part.

The clutch is provided with a clutch bulge, when the eccentric bulge pushes the abutting part on one shifting fork to be far away from the clutch bulge, the abutting part on the other shifting fork can be pushed to push the clutch bulge under the action of the elastic force of the elastic part, and thus the clutch can be moved to the corresponding gear.

Preferably, the first abutting portion and the second abutting portion are arranged in parallel, the third abutting portion and the fourth abutting portion are arranged in parallel, through holes which are coaxially arranged are formed in the first abutting portion and the second abutting portion respectively, through holes which are coaxially arranged are formed in the third abutting portion and the fourth abutting portion respectively, and the fixing shaft penetrates through the through holes in the first shifting fork and the second shifting fork in sequence.

The fixed shaft passes through the two through holes on the first shifting fork, and the first shifting fork can move along the fixed shaft when being pushed by the limiting piece; because the first abutting part and the second abutting part are arranged in parallel, the elastic force of the elastic piece received by the first abutting part and the second abutting part is more uniform; similarly, the third abutting part and the fourth abutting part are more uniformly subjected to the elastic force of the elastic piece.

Preferably, the second abutting portion is provided with a first arc-shaped notch matched with the appearance profile of the clutch, the fourth abutting portion is provided with a second arc-shaped notch matched with the appearance profile of the clutch, and the first arc-shaped notch and the second arc-shaped notch are coaxially arranged.

The second abutting portion is provided with a first arc-shaped notch, and the fourth abutting portion is provided with a second arc-shaped notch, so that the clutch cannot interfere with the first shifting fork and the second shifting fork when rotating along with the rotary spline housing.

Preferably, the first abutting portion and the second abutting portion are connected through a first connecting section, the third abutting portion and the fourth abutting portion are connected through a second connecting section, and the distance from the first abutting portion to the second abutting portion is smaller than the distance from the third abutting portion to the fourth abutting portion.

First butt joint portion and third butt joint portion laminating setting each other, simultaneously first butt joint portion is less than third butt joint portion to fourth butt joint portion distance to second butt joint portion distance, and first shift fork and second shift fork just can the staggered installation on the fixed axle like this.

Preferably, one end of the elastic member abuts against the end face of the second abutting portion, and the other end of the elastic member abuts against the third placed end face; the elastic member is always in a compressed state.

The elastic piece is in a compression state, so that the elastic piece can always press and contact the second abutting part and the third abutting part, and the clutch can be clamped by the first shifting fork and the second shifting fork.

Preferably, the side surface of the rotating gear assembly is also provided with a first gear which is meshed with the rotating gear assembly and is used for transmission, a limiting part used for locking the first gear to rotate is arranged at a position, close to the first gear, of the first shifting fork, and gear teeth meshed with the first gear are arranged on the limiting part; the limiting portion and the first abutting portion are arranged in parallel, and the limiting portion extends from the first abutting portion to the direction of the first gear.

The limiting part drives the limiting part to move along the fixed shaft when pushing the first shifting fork to move, and the limiting part moves close to or far away from the first gear; when the limiting part is meshed with the first gear, the first gear cannot rotate; when the limiting part is separated from the first gear, the rotating gear assembly can synchronously drive the first gear to rotate when rotating.

Preferably, the clutch moves in the axial direction of the output shaft of the motor while the knob rotates, and the knob corresponds to four gears respectively when rotating to a first position, a second position, a third position and a fourth position; when the knob rotates to a first position, spline teeth on the clutch are meshed with spline teeth on the rotary gear assembly, the spline sleeve drives the rotary gear assembly to synchronously rotate, the rotary gear assembly drives the first gear to rotate while rotating, and the first position is a drilling gear; when the knob rotates to a second position, the clutch is simultaneously meshed with spline teeth on the rotating gear assembly and the swing rod bearing, the spline sleeve synchronously drives the rotating gear assembly and the swing rod bearing to rotate, and the second position is a hammer drill stop; when the knob rotates to a third position, spline teeth on the clutch are meshed with spline teeth on the swing rod bearing, the spline sleeve and the swing rod bearing are linked with each other, a limiting part on the first shifting fork is far away from the first gear, and the third position is a flat chisel angle adjusting gear; when the knob rotates to the fourth position spline tooth on the clutch and the spline tooth on the swing rod bearing are mutually engaged, the spline housing drives the swing rod bearing to rotate, and the limiting part on the first shifting fork limits the rotation of the first gear, and the fourth position is a hammer stop.

When the knob is rotated to four different positions, the clutch is moved to four different positions, so that the knob can have four corresponding different gears; the clutch is only when fourth position hammer catch, spacing portion on the teeth of a cogwheel just can with first gear intermeshing, first gear is unable to rotate.

Preferably, the shell is further provided with a locking piece, the locking piece is provided with an elastic bulge facing the knob, and the knob is provided with a plurality of concave parts which are matched with the elastic bulge to limit the rotation of the knob.

When the knob rotates to a corresponding gear, the elastic bulge on the locking piece can be clamped into the inner concave part, so that the knob cannot rotate relative to the shell, the eccentric bulge on the limiting piece can also be kept static while the knob is kept static in rotation, and the clutch cannot move along the axial direction of the fixed shaft and is maintained on the corresponding gear.

Compared with the prior art, the utility model discloses following beneficial effect has: the first shifting fork and the second shifting fork are sleeved and installed on the fixed shaft of the shell, the elastic part is arranged between the first shifting fork and the second shifting fork, the rotation and the limiting part rotate synchronously, the limiting part can push one shifting fork to be separated from the clutch, the other shifting fork can be close to the shifting fork which moves firstly under the action of the elastic force of the elastic part, and thus the shifting fork which moves later can push the clutch to move to the corresponding gear; the thrust that the clutch received is even and level and smooth, and the clutch will be reliable like this moves to on the fender position that corresponds, and the clutch shifts gears conveniently. When the clutch is shifted in place, the knob and the limiting piece cannot continue to rotate, and the second abutting part and the fourth abutting part can mutually clamp the clutch at the moment, so that the clutch is always maintained at a corresponding gear; the gears of the clutch can be switched again only through external force rotation, and therefore the clutch can be stably maintained to work in the corresponding gear. Therefore, the utility model discloses it is simple and reliable to shift.

Drawings

Fig. 1 is a perspective view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a perspective view of the first fork;

FIG. 4 is a perspective view of a second fork;

FIG. 5 is a diagram of the working state of the present invention mounted on the output shaft of the motor;

fig. 6 is an exploded view of the present invention mounted on a power tool;

FIG. 7 is an internal structural view of various components on the output shaft of the motor;

FIG. 8 is a perspective view of the knob and the stop member when assembled;

fig. 9 is a perspective view of the present invention mounted on an electric tool.

The labels in the figure are: 1. a knob; 2. a stopper; 201. an eccentric protrusion; 3. a fixed shaft; 4. a clutch; 41. a clutch projection; 5. a first shift fork; 51. a first abutting portion; 52. a second abutting portion; 53. a first arc-shaped notch; 54. a first connection section; 55. a limiting part; 6. a second fork; 61. a third abutting portion; 62. a fourth abutting portion; 63. a second arc-shaped notch; 64. a second connection section; 7. an elastic member; 8. an output shaft of the motor; 9. a spline housing; 10. a swing rod bearing; 11. a rotating gear assembly; 12. spline teeth; 13. a first gear; 14. a first position; 15. a second position; 16. a third position; 17. a fourth position; 18. a locking piece; 19. an elastic bulge; 20. an inner recess.

Detailed Description

The invention will be further described with reference to the embodiments shown in the drawings to which:

as shown in fig. 1 to 9, the present embodiment discloses a gear shifting device for an electric tool, which includes a knob 1, a limiting member 2, a fixed shaft 3 and a clutch 4, wherein the knob 1 and the limiting member 2 are mounted on a housing and rotate synchronously; a fixed shaft 3 fixedly connected with the shell is arranged in the shell, and a first shifting fork 5 and a second shifting fork 6 for pushing the clutch 4 to move are sleeved on the fixed shaft 3; the first shifting fork 5 and the second shifting fork 6 are sleeved on the fixed shaft 3, the first shifting fork 5 comprises a first abutting part 51 and a second abutting part 52, and the second shifting fork 6 comprises a third abutting part 61 and a fourth abutting part 62; when the clutch 4 is in the corresponding gear position, the first abutting part 51 and the third abutting part 61 are mutually abutted, the elastic piece 7 is further sleeved on the fixed shaft 3, and the elastic piece 7 is clamped between the second abutting part 52 and the third abutting part 61; the clutch 4 and the position limiting member 2 are simultaneously clamped between the second abutting portion 52 and the fourth abutting portion 62, the clutch 4 is sleeved on the motor output shaft 8, and when one shifting fork is shifted by the position limiting member 2, the other shifting fork pushes the clutch 4 to move along the motor output shaft 8.

A spline housing 9 which is fixedly connected with the motor output shaft 8 and synchronously rotates with the motor output shaft is arranged in the middle of the motor output shaft 8, a swing rod bearing 10 and a rotary gear assembly 11 are respectively arranged on two adjacent sides of the spline housing 9, and the swing rod bearing 10 and the rotary gear assembly 11 are sleeved on the motor output shaft 8; spline teeth 12 are respectively arranged on the spline housing 9, the swing rod bearing 10 and the rotating gear assembly 11, and the spline teeth 12 are also arranged on the inner wall of the clutch 4 and are respectively meshed with the spline housing 9, the swing rod bearing 10 and the spline teeth 12 on the rotating gear assembly 11; the clutch 4 moves along the motor output shaft 8, simultaneously, the spline teeth 12 on the clutch 4 are always in a meshing state with the spline teeth 12 on the spline housing 9, and the spline housing 9 rotates to drive the clutch 4 to rotate. The side surface of the rotating gear assembly 11 is also provided with a first gear 13 which is meshed with the rotating gear assembly and is used for transmission, a limiting part 55 which is used for locking the first gear 13 to rotate is arranged at a position, close to the first gear 13, of the first shifting fork 5, and gear teeth which are meshed with the first gear 13 are arranged on the limiting part 55; the stopper portion 55 and the first contact portion 51 are provided in parallel with each other, and the stopper portion 55 extends from the first contact portion 51 in the direction of the first gear 13. When the knob 1 rotates, the clutch 4 moves in the axial direction of the motor output shaft 8, and when the knob 1 rotates to a first position 14, a second position 15, a third position 16 and a fourth position 17, four gears are respectively corresponding to the first position, the second position, the third position and the fourth position; when the knob 1 rotates to a first position 14, the spline teeth 12 on the clutch 4 are meshed with the spline teeth 12 on the rotating gear assembly 11, the spline sleeve 9 drives the rotating gear assembly 11 to synchronously rotate, the rotating gear assembly 11 drives the first gear 13 to rotate while rotating, and the first position 14 is a drilling stop; when the knob 1 rotates to a second position 15, the clutch 4 is simultaneously meshed with the spline teeth 12 on the rotating gear assembly 11 and the swing rod bearing 10, the spline sleeve 9 synchronously drives the rotating gear assembly 11 and the swing rod bearing 10 to rotate, and the second position 15 is a hammer drill stop; when the knob 1 rotates to a third position 16, spline teeth 12 on the clutch 4 are meshed with spline teeth 12 on the swing rod bearing 10, the spline sleeve 9 and the swing rod bearing 10 are linked with each other, a limiting part 55 on the first shifting fork 5 is far away from the first gear 13, and the third position 16 is a flat chisel angle adjusting gear; when the knob 1 rotates to the fourth position 17, the spline teeth 12 on the clutch 4 and the spline teeth 12 on the swing rod bearing 10 are meshed with each other, the spline sleeve 9 drives the swing rod bearing 10 to rotate, meanwhile, the limiting part 55 on the first shifting fork 5 limits the first gear 13 to rotate, and the fourth position 17 is a hammer stop. Still be equipped with locking plate 18 on the casing, be equipped with the elastic bulge 19 towards knob 1 on the locking plate 18, be equipped with a plurality of cooperation elastic bulge 19 on the knob 1 and restrict the interior concave part 20 of knob 1 pivoted.

A clutch bulge 41 is arranged on the arc side surface of the clutch 4, the second abutting part 52 and the fourth abutting part 62 are respectively arranged on two sides of the clutch bulge 41, and gaps exist between the second abutting part 52 and the clutch bulge 41 and between the fourth abutting part 62 and the clutch bulge 41; an end surface of the stopper 2 facing the clutch 4 is provided with an eccentric protrusion 201, and the eccentric protrusion 201 is sandwiched between the second abutting portion 52 and the fourth abutting portion 62. First butt portion 51 and second butt portion 52 are parallel to each other, third butt portion 61 and fourth butt portion 62 are parallel to each other, be equipped with the through-hole that sets up with the axle center on first butt portion 51 and the second butt portion 52 respectively, be equipped with the through-hole that sets up with the axle center on third butt portion 61 and the fourth butt portion 62 to respectively, fixed axle 3 passes the through-hole on first shift fork 5 and the second shift fork 6 in proper order. The second abutting portion 52 is provided with a first arc-shaped notch 53 matched with the outline of the clutch 4, the fourth abutting portion 62 is provided with a second arc-shaped notch 63 matched with the outline of the clutch 4, and the first arc-shaped notch 53 and the second arc-shaped notch 63 are coaxially arranged. The first abutting portion 51 is connected with the second abutting portion 52 through a first connecting section 54, the third abutting portion 61 is connected with the fourth abutting portion 62 through a second connecting section 64, and the distance from the first abutting portion 51 to the second abutting portion 52 is smaller than the distance from the third abutting portion 61 to the fourth abutting portion 62. One end of the elastic piece 7 abuts against the end face of the second abutting part 52, and the other end of the elastic piece 7 abuts against the third placed end face; the elastic element 7 is always in compression.

The specific working process of this embodiment is as follows, turning the knob 1, the knob 1 will be kept stationary with respect to the housing under the constraint of the locking tab 18, and the knob 1 will be maintained in the corresponding gear.

Rotating the knob 1 to maintain the knob 1 at the first position 14, wherein the electric hammer is in a drilling stop; when switching from another gear to the drilling gear, the eccentric protrusion 201 below the limiting member 2 first pushes the second abutting portion 52 to disengage from the clutch protrusion 41 and approach the rotating gear assembly 11, and the elastic member 7 is further compressed while the second abutting portion 52 moves, so that the third abutting portion 61 is under the elastic force of the elastic member 7 and tends to approach the rotating gear assembly 11, and the fourth abutting portion 62 on the second fork 6 simultaneously presses and contacts the clutch protrusion 41; when the spline teeth 12 on the clutch 4 are meshed with the spline teeth 12 on the rotary gear assembly 11, the fourth abutting portion 62 pushes the clutch 4 to approach the rotary gear assembly 11, so that the rotary gear assembly 11 rotates synchronously while the motor output shaft 8 rotates, and the rotary gear assembly 11 rotates while driving the first gear 13 to rotate in a meshed manner, so that the electric hammer can maintain the drilling stop operation.

When the knob 1 is rotated to the corresponding gear, the eccentric protrusion 201 below the limiting member 2 is kept stationary, and the second abutting portion 52 and the fourth abutting portion 62 abut against the eccentric protrusion 201; at this time, the elastic force generated by the elastic element 7 makes the second abutting portion 52 abut against one side of the clutch projection 41, and the fourth abutting portion 62 also abuts against the other side of the clutch projection 41 under the effect of the elastic force, so that the second abutting portion 52 and the fourth abutting portion 62 clamp the clutch 4 and maintain the clutch 4 in the corresponding gear.

Similarly, the knob 1 is rotated again to maintain the knob 1 at the second position 15, and the electric hammer is positioned at the hammer drill stop; the limiting piece 2 can push the first shifting fork 5 and the second shifting fork 6 to move along the fixed shaft 3, and the first shifting fork 5 and the second shifting fork 6 can push the clutch 4 to move on the motor output shaft 8 at the same time of moving; at the moment, the spline teeth 12 on the clutch 4 are meshed with the spline teeth 12 on the rotating gear assembly 11 and the swing rod bearing 10 at the same time, so that the rotating gear assembly 11 and the swing rod bearing 10 synchronously rotate while the spline sleeve 9 rotates, the drill bit of the electric hammer can extend and retract in the axial direction in a reciprocating mode while rotating, and the electric hammer is located at a hammer drill stop.

Then the knob 1 is rotated to maintain the knob 1 at a third position 16, and the electric hammer is at a flat chisel angle adjusting gear at the moment; at the moment, the spline teeth 12 on the clutch 4 are simultaneously meshed with the spline sleeve 9 and the spline teeth 12 on the swing rod bearing 10; meanwhile, the limiting part 55 on the first shifting fork 5 is far away from the first gear 13, so that the first gear 13 can rotate freely relative to the shell; the operator can adjust the angle of the drill bit according to his own needs and then turn the knob 1 to let the knob 1 turn to the fourth position 17, i.e. the hammer stop, thus locking the angle of the drill bit in advance.

At this time, the knob 1 is already in the fourth position 17, the spline teeth 12 on the clutch 4 are simultaneously meshed with the spline housing 9 and the spline teeth 12 on the swing rod bearing 10, and the swing rod bearing 10 is driven to synchronously rotate by the rotation of the spline housing 9. Meanwhile, the limiting part 55 on the first shifting fork 5 is close to the first gear 13, the gear teeth on the limiting part 55 and the first gear 13 are in an intermeshing state, the first gear 13 is fixed and cannot rotate, the motor output shaft 8 can only drive the swing rod bearing 10 to rotate, and then the electric hammer can be maintained at a fixed angle for hammer chiseling.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. A gear shifting device for an electric tool comprises a knob (1), a limiting piece (2), a fixed shaft (3) and a clutch (4), and is characterized in that the knob (1) and the limiting piece (2) are mounted on a shell and rotate synchronously; a fixed shaft (3) fixedly connected with the shell is arranged in the shell, and a first shifting fork (5) and a second shifting fork (6) for pushing the clutch (4) to move are sleeved on the fixed shaft (3); the first shifting fork (5) and the second shifting fork (6) are sleeved on the fixed shaft (3), the first shifting fork (5) comprises a first abutting part (51) and a second abutting part (52), and the second shifting fork (6) comprises a third abutting part (61) and a fourth abutting part (62); when the clutch (4) is in a corresponding gear position, the first abutting part (51) and the third abutting part (61) are mutually abutted, an elastic part (7) is further sleeved on the fixed shaft (3), and the elastic part (7) is clamped between the second abutting part (52) and the third abutting part (61); the clutch (4) and the limiting piece (2) are clamped between the second abutting portion (52) and the fourth abutting portion (62) at the same time, the clutch (4) is sleeved on the motor output shaft (8), and when one shifting fork is shifted by the limiting piece (2), the other shifting fork pushes the clutch (4) to move along the motor output shaft (8).

2. The gear shifting device for the electric tool is characterized in that a spline housing (9) which is fixedly connected with the motor output shaft (8) and synchronously rotates with the motor output shaft is arranged in the middle of the motor output shaft (8), a swing rod bearing (10) and a rotating gear assembly (11) are respectively arranged on two adjacent sides of the spline housing (9), and the swing rod bearing (10) and the rotating gear assembly (11) are sleeved on the motor output shaft (8); spline teeth (12) are respectively arranged on the spline housing (9), the swing rod bearing (10) and the rotating gear assembly (11), and the spline teeth (12) are also arranged on the inner wall of the clutch (4) and are respectively meshed with the spline housing (9), the swing rod bearing (10) and the spline teeth (12) on the rotating gear assembly (11); while the clutch (4) moves along the motor output shaft (8), the spline teeth (12) on the clutch (4) are always meshed with the spline teeth (12) on the spline sleeve (9), and the spline sleeve (9) rotates and drives the clutch (4) to rotate.

3. The gear shifting device for the power tool according to claim 1, wherein a clutch protrusion (41) is provided on the circular arc side of the clutch (4), the second abutting portion (52) and the fourth abutting portion (62) are respectively provided on both sides of the clutch protrusion (41), and a gap exists between each of the second abutting portion (52) and the fourth abutting portion (62) and the clutch protrusion (41); an end face, facing the clutch (4), of the limiting piece (2) is provided with an eccentric protrusion (201), and the eccentric protrusion (201) is clamped between the second abutting portion (52) and the fourth abutting portion (62).

4. The shifting device for the power tool according to claim 3, wherein the first abutting portion (51) and the second abutting portion (52) are arranged in parallel, the third abutting portion (61) and the fourth abutting portion (62) are arranged in parallel, through holes coaxially arranged are formed in the first abutting portion (51) and the second abutting portion (52), through holes coaxially arranged are formed in the third abutting portion (61) and the fourth abutting portion (62), and the fixing shaft (3) sequentially penetrates through the through holes in the first shifting fork (5) and the through holes in the second shifting fork (6).

5. The gear shifting device for the power tool as claimed in claim 4, wherein the second abutting portion (52) is provided with a first arc-shaped notch (53) matched with the contour of the clutch (4), the fourth abutting portion (62) is provided with a second arc-shaped notch (63) matched with the contour of the clutch (4), and the first arc-shaped notch (53) and the second arc-shaped notch (63) are coaxially arranged.

6. The shifting apparatus for a power tool according to claim 4, wherein the first abutting portion (51) and the second abutting portion (52) are connected by a first connecting section (54), the third abutting portion (61) and the fourth abutting portion (62) are connected by a second connecting section (64), and a distance from the first abutting portion (51) to the second abutting portion (52) is smaller than a distance from the third abutting portion (61) to the fourth abutting portion (62).

7. The shifting apparatus for a power tool according to claim 1, wherein one end of the elastic member (7) abuts against an end face of the second abutting portion (52), and the other end of the elastic member (7) abuts against a third placed end face; the elastic piece (7) is always in a compressed state.

8. The gear shifting device for the electric tool is characterized in that a first gear (13) which is meshed with the gear shifting device and is used for transmission is further arranged on the side surface of the rotating gear assembly (11), a limiting part (55) which is used for locking the first gear (13) to rotate is arranged at the position, close to the first gear (13), of the first shifting fork (5), and gear teeth which are meshed with the first gear (13) are arranged on the limiting part (55); the limiting part (55) and the first abutting part (51) are arranged in parallel, and the limiting part (55) extends from the first abutting part (51) to the direction of the first gear (13).

9. The gear shifting device for the power tool as claimed in claim 8, wherein the knob (1) rotates while the clutch (4) moves in the axial direction of the motor output shaft (8), and the knob (1) rotates to the first position (14), the second position (15), the third position (16) and the fourth position (17) corresponding to four gears respectively; when the knob (1) rotates to a first position (14), spline teeth (12) on the clutch (4) are meshed with spline teeth (12) on the rotary gear assembly (11), the spline sleeve (9) drives the rotary gear assembly (11) to synchronously rotate, the rotary gear assembly (11) drives the first gear (13) to rotate while rotating, and the first position (14) is a drilling stop; when the knob (1) rotates to a second position (15), the clutch (4) is simultaneously meshed with the spline teeth (12) on the rotating gear assembly (11) and the swing rod bearing (10), the spline sleeve (9) synchronously drives the rotating gear assembly (11) and the swing rod bearing (10) to rotate, and the second position (15) is a hammer drill stop; when the knob (1) rotates to a third position (16), spline teeth (12) on the clutch (4) are meshed with spline teeth (12) on the swing rod bearing (10), the spline sleeve (9) and the swing rod bearing (10) are linked with each other, a limiting part (55) on the first shifting fork (5) is far away from the first gear (13), and the third position (16) is a flat chisel angle adjusting gear; when knob (1) rotated fourth position (17) spline tooth (12) on clutch (4) and spline tooth (12) intermeshing on swing rod bearing (10), spacing portion (55) on first shift fork (5) restriction first gear (13) rotated when spline housing (9) drove swing rod bearing (10) pivoted, fourth position (17) are hammer block.

10. The gear shifting device for the electric tool according to claim 1, wherein a locking plate (18) is further disposed on the housing, an elastic protrusion (19) facing the knob (1) is disposed on the locking plate (18), and a plurality of concave portions (20) cooperating with the elastic protrusion (19) to limit the rotation of the knob (1) are disposed on the knob (1).

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