CN210996649U

CN210996649U - Hand-held power tool

Info

Publication number: CN210996649U
Application number: CN201921464354.6U
Authority: CN
Inventors: 谢明健; 李佶
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-07-14
Anticipated expiration: 2029-09-04

Abstract

The application relates to a hand-held power tool, comprising: a control device and a mode adjustment mechanism. The control device is used for controlling the motor to rotate forwards or reversely; the force tool also includes a mode adjustment mechanism. The mode adjusting mechanism comprises a mode switching piece which can be operated; the mode switching member is used for switching the power tool at least between a first mode and a second mode; the mode switching piece is operable to move between at least a first position and a second position, when the mode switching piece is located at the first position, the hand-held power tool is in the first mode, and the motor can perform at least reverse rotation under the action of the control device; when the mode switch member is moved to the second position, the hand-held power tool is in the second mode, and the control device is capable of responding to the operation of the mode switch member and controlling the motor to rotate in the forward direction. Therefore, the motor can rotate in the correct forward direction when the power tool is switched to the second mode.

Description

Hand-held power tool

Technical Field

The present application relates to the field of hand-held power tools, and more particularly to a hand-held power tool with a motor forward/reverse rotation control mechanism.

Background

With the development of modern society, the hand-held power tool gradually replaces a pure manual tool, and is convenient for production and life of people. Among them, electric drills are widely researched and developed as one of the most commonly used hand-held power tools.

Electric drills are typically operated by a motor driving a tool shaft with a tool head in rotation. The application range of the electric drill is enriched, and one electric drill generally comprises a plurality of working modes. In some modes of operation, it is desirable that the motor be in a fixed rotational direction (forward or reverse) to drive the tool shaft in a fixed rotational direction (forward or reverse). However, the motor can normally rotate in either the forward or reverse direction. Therefore, the operator may easily select the wrong motor rotation direction due to the wrong operation, which may cause the machine to be damaged.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide a hand-held power tool.

A hand-held power tool comprising a housing; a motor disposed within the housing and capable of providing power; the tool spindle is used for receiving the tool head to drive the tool head to work; the impact mechanism can form impact on the tool spindle along a first axial direction under the driving of the motor, wherein the first axial direction is from the end of the motor to the end of the tool head along the motor axial direction; and a control device for controlling the motor to change a rotation direction of the motor; the hand-held power tool further comprises a mode adjustment mechanism capable of switching the power tool between at least an impact mode and a non-impact mode, the mode adjustment mechanism comprising a mode switch member operable to move between a first position and a second position, the hand-held power tool being in the non-impact mode when the mode switch member is in the first position, the impact mechanism generating no axial impact to the tool spindle, and the motor being selectively rotatable in a first rotational direction or a second rotational direction opposite to the first rotational direction under the action of the control means; when the mode switching piece is in the second position, the handheld power tool is in an impact mode, the motor can only rotate in a first rotating direction under the action of the control device, and the impact mechanism can impact the tool spindle in the first axial direction.

In one embodiment, the control device is capable of responding to the movement of the mode switch from the first position to the second position and controlling the motor only in the first rotational direction.

In one embodiment, the impact mechanism includes a hammer, a guide, a first guide provided on the hammer, a second guide provided on the guide, and an energy accumulating element in elastic abutment with the hammer; in an impact mode, the hammer can rotate around a first rotating direction relative to the guide piece, the hammer overcomes the acting force of the energy storage element under the action of the first guide piece and the second guide piece and moves along a second axial direction opposite to the first axial direction, and the energy storage element can drive the hammer to move towards the first axial direction to impact the tool spindle; in the non-impact mode, the hammer and the guide piece do not rotate relatively, and the hammer does not impact the tool spindle.

In one embodiment, the control device comprises a forward and reverse rotation switch operable to move at least in a first control position and a second control position, and a linkage member disposed between the mode switching member and the forward and reverse rotation switch, the motor rotating in a first rotational direction when the forward and reverse rotation switch is in the first control position; when the forward and reverse rotation switch is at a second control position, the motor rotates along a second rotation direction; when the mode switching piece is located at the first position, the forward and reverse rotation switch can selectively move to the first control position or the second control position, and when the mode switching piece moves from the first position to the second position, the forward and reverse rotation switch is driven to the first control position by the linkage piece.

In one embodiment, when the reversible switch is in the first control position and the mode switching member is operated from the first position to the second position, the linkage member moves relative to the reversible switch under the action of the mode switching member, and the reversible switch is still in the first control position.

In one embodiment, the control device further includes an elastic element, one end of the elastic element is elastically abutted with the linkage piece, the other end of the elastic element is elastically abutted with the shell, when the mode switching piece is switched from the first position to the second position, the linkage piece moves under the action of the mode switching piece against the acting force of the elastic element, and when the mode switching piece returns to the first position, the linkage piece is reset under the action of the elastic element.

In one embodiment, the forward and reverse rotation switch is provided with a guide post, the linkage piece is provided with a guide groove matched with the guide post, and when the mode switching piece is switched from the first position to the second position, the guide groove can drive the forward and reverse rotation switch to be switched from the second control position to the first control position through the guide post; when the forward and reverse rotation switch is in the first control position, in the process of operating the mode switching piece from the first position to the second position, the guide groove moves relative to the guide column, and the guide column is fixed relative to the shell in the guide groove, so that the forward and reverse rotation switch is still in the first control position.

In one embodiment, the control device further includes a first control unit that controls the motor to rotate in a first rotational direction when the forward/reverse rotation control switch is in the first control position and controls the motor to rotate in a second rotational direction when the forward/reverse rotation control switch is in the second control position, and a detection element that transmits a detection signal to the second control unit when the mode switching member is switched to the second position, and the second control unit controls the motor to rotate forward in preference to the first control unit.

In one embodiment, the control device further comprises a detection element and a second control unit connected with the detection element, when the mode switching piece is switched to the second position, the detection element sends a detected signal to the second control unit, and the motor is controlled to rotate forwards through the second control unit.

In one embodiment, the detecting element is a hall sensor, and the control device further includes a magnet disposed on the mode switching member and capable of moving with the mode switching member when the mode is switched.

Drawings

FIG. 1 is a schematic cross-sectional view of a hand-held power tool according to an embodiment of the present application in an impact mode;

FIG. 2 is an exploded view of a hand-held power tool according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a hand-held power tool according to an embodiment of the present application in a non-impact mode;

FIG. 4 is a schematic view of a tool spindle integrated with an impact structure shaft according to another embodiment;

FIG. 5 is a schematic structural view of a guide member of a hand-held power tool according to an embodiment of the present application;

fig. 6 is a schematic structural view of an impact switch member of the hand-held power tool according to the embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of the impact switch member engaging the guide member in the impact mode;

FIG. 8 is a schematic configuration view of the impact switch member separated from the guide member in the impact mode;

FIG. 9 is a schematic cross-sectional view of the impact switch engaged with the guide in the impact mode;

FIG. 10 is a schematic configuration view when the impact switch member is separated from the guide member in the impact mode;

fig. 11 is a schematic structural view of a mode switching member according to an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a torque adjustment disk according to an embodiment of the present application;

FIG. 13 is a schematic structural view of a torque adjustment ring according to an embodiment of the present application;

FIG. 14 is a partial schematic structural view of a hand-held power tool according to an embodiment of the present application in a hammer drill mode;

FIG. 15 is a partial schematic structural view of a hand-held power tool according to an embodiment of the present application in a drill mode;

FIG. 16 is a partial schematic structural view of a driver tool according to an embodiment of the present application in the driver mode;

FIG. 17 is a partial schematic structural view of a hand-held power tool according to an embodiment of the present application in an impact screwdriver mode;

FIG. 18 is a schematic drawing in partial section of a hand-held power tool according to an embodiment of the present application;

fig. 19 is a structural schematic view of an abutment portion of a hammer of a hand-held power tool according to an embodiment of the present application;

FIG. 20 is a schematic view of the torque adjustment disk crimped to the ring gear;

fig. 21 is a schematic structural view of an impact switch member according to another embodiment of the present application;

FIG. 22 is a schematic structural diagram of a mode switch according to another embodiment of the present application;

FIG. 23 is a partial schematic view of another embodiment of a hand-held power tool in an impact screwdriver mode;

FIG. 24 is a partial schematic view of a hand held power tool according to another embodiment of the present invention in a drill mode;

FIG. 25 is a schematic view of a portion of another embodiment of a hand-held power tool in a screwdriver mode;

fig. 26 is a perspective view of a partial structure of a mode switching member and a control device in an embodiment of the present application;

fig. 27 (a) - (d) are schematic diagrams illustrating an embodiment of the present application, in which when the forward/reverse switch is located at the second control position, the operation mode switching member moves from the first position to the second position, and the linkage member drives the forward/reverse switch to move to the first control position;

FIG. 28 is a schematic view showing the mode of the present embodiment, in which the operating mode switching member moves from the first position to the second position when the reversible switch is in the first control position, the linkage member moves relative to the reversible switch, and the reversible switch is still in the first control position;

FIG. 29 is a schematic view of a structure associated with the mode switch being in the first position according to an embodiment of the present application;

fig. 30 is a structural diagram of the mode switching member at the second position according to an embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, a hand-held power tool according to an embodiment of the present application includes at least an impact mode and a non-impact mode, and includes a housing 10, a transmission mechanism 20 disposed in the housing 10, a motor 30 disposed in the housing 10 and supplying power to the transmission mechanism 20, an impact mechanism 40 driven by the transmission mechanism 20, a tool spindle 50, and a mode adjustment mechanism 60. The housing 10 comprises a first half housing and a second half housing provided with a gripping handle.

The tool spindle 50 is for receiving a tool head 200, having a central axis X. In impact mode, the tool spindle 50 reciprocates along its central axis X. In the non-impact mode, the tool spindle 50 is not capable of reciprocating along its central axis X. The mode adjustment mechanism 60 is used to switch the hand-held power tool between the impact mode and the non-impact mode. As described in further detail below.

The impact mechanism 40 includes a hammer 410, a guide 420, and an energy storage member 431 abutting against the hammer 410, wherein the hammer 410 is provided with a first guide 432, and the guide 420 is provided with a second guide 433. In the impact mode, the hammer 410 rotates relative to the guide 420, so that the first guide 432 can drive the hammer 410 to move along the central axis X toward the second axial direction a against the force of the energy accumulating element 431 through the second guide 433, and the energy accumulating element 431 can drive the hammer 410 to move along the central axis X toward the first axial direction B opposite to the second axial direction a to impact the tool spindle 50; in the non-impact mode, the ram 410 and the guide 420 do not rotate relative to each other. In the embodiment shown in fig. 1, the second axis a is horizontal to the right and the first axis B is horizontal to the left.

The transmission mechanism 20 serves to transmit the power of the motor 30 to at least one of the hammer 410 and the guide 420. The mode adjustment mechanism 60 is operable to switch between a first state in which the hammer 410 is able to rotate relative to the guide 420, i.e., there is relative rotation therebetween, and a second state in which the hand-held power tool is in the impact mode; in the second state, the guide member 420 can be rotated by the motor 30, but the hammer 410 and the guide member 420 do not rotate relative to each other, and the hand-held power tool is in the non-impact mode. Therefore, the handheld power tool can be switched between the impact mode and the non-impact mode through the operation mode adjusting mechanism 60, the switching is convenient, and the functions of the handheld power tool are enriched.

There are various ways in which the operating mode adjustment mechanism 60 can change the state of relative movement of the ram 410 and the guide 420.

As shown in fig. 3, the impact mechanism 40 further includes an impact structure shaft 434 that is driven to rotate by the transmission mechanism 20, and when the mode adjustment mechanism 60 is in the first state, one of the guide 420 and the hammer 410 is fixed with respect to the housing 10, and the other is driven to rotate by the impact structure shaft 434; when the mode adjustment mechanism 60 is in the second state, the fixation of one of the guide 420 and the hammer 410 with respect to the housing is released and rotates with the other of the first guide 432 and the second guide 433.

Specifically, in the present embodiment, the ram 410 and the guide member 420 are driven to rotate by the impact structure shaft 434. When the mode adjustment mechanism 60 is in the first state, the guide 420 is restricted from rotating to be fixed relative to the housing 10, so that the energy accumulating element 431 can drive the hammer 410 to move along the central axis X toward the first axial direction B to impact the tool spindle 50 when the hammer 410 is driven to rotate by the impact structure shaft 434. When the mode adjustment mechanism 60 is in the second state, the guide member 420 can be driven to rotate by the motor 30, and the hammer 410 is also rotated synchronously, so that the guide member 420 and the hammer 410 do not rotate relatively and the hammer 410 does not move axially back and forth.

In another embodiment, when the mode adjustment mechanism 60 is in the first state, the reverse situation may be true, i.e., the hammer 410 is restricted from rotating while the guide 420 is rotating, and at this time, the energy accumulating element 431 can drive the hammer 410 to move along the central axis X toward the first axial direction B to impact the tool spindle 50. When the mode adjustment mechanism 60 is in the second state, the guide 420 and the hammer 410 rotate synchronously without relative rotation therebetween, and the hammer 410 does not reciprocate axially.

In yet another embodiment, when the mode adjustment mechanism 60 is in the first state, both the ram 410 and the guide 420 rotate. Specifically, at this time, the hammer 410 and the guide 420 have a difference in rotational speed such that there is relative rotational movement therebetween, and the hammer 410 can impact the tool spindle 50.

In the embodiment shown in fig. 3, the impingement structure shaft 434 is provided separate from the tool spindle 50. However, the impingement structure shaft 434 and the tool spindle 50 may also be integrally provided. In another embodiment, shown in fig. 4, the tool spindle 50 has a left end for receiving the tool bit 200, a middle portion for driving the ram 410 and the guide 420, and a right end for engaging the transmission mechanism 20 to receive power from the motor 30.

Energy accumulating element 431 may move ram 410 axially when ram 410 and guide 420 are able to rotate relative to each other. Specifically, as shown in fig. 3, the guide 420 is sleeved outside the ram 410, the second guide 433 is disposed on an inner circumferential surface of the guide 420, and the first guide 432 is disposed on an outer circumferential surface of the ram 420. As shown in fig. 5 and 6, the first guide 432 is a ball movably disposed on the ram 410, and the second guide 433 includes a plurality of climbing sections 4331 and falling sections 4332. As the ball passes the ramp section 4331, the ball drives the ram 410 towards the second axial direction a against the force of the energy storage element 431; when the ball passes through the drop section 4332, the energy accumulating element 431 drives the ram 410 in a first axial direction B opposite to the second axial direction a to achieve the impact.

In this embodiment, preferably, the highest vertex of the climbing section 4331 is connected with the highest vertex of the falling section 4332. Further, the climbing section 4331 may be of a helical line type, the falling section 4332 may be of a linear type, and the falling section 4332 extends along the central axis X of the tool spindle 50. Preferably, in order to ensure that the hammer 410 generates a sufficient impact force to the tool spindle 50 and the hand-held power tool is compact in size, the climbing section 4331 has a climbing height in the axial direction of greater than 3mm and equal to or less than 15mm, preferably, a climbing height of greater than or equal to 4mm and equal to or less than 12mm, and more preferably, a climbing height of 10 mm. It should be noted that the "climbing height" refers to an axial distance between both ends of the climbing section 4331 on the central axis X of the tool spindle 50. When the first guide part 432 falls from the highest top point of the climbing section 4331, it may fall to the bottom of the next climbing section 4331 along the falling section 4332, or may directly fall to the bottom of the next climbing section 4331 without passing through the falling section 4332 in a manner that the movement locus is parabolic, in other words, the falling section 4332 may also be provided as a discontinuous portion disposed between the climbing section 4331 and the climbing section 4331.

In this embodiment, the ram 410 is fitted over the impact structure shaft 434, and the guide 420 is fitted over the ram 410. In order to achieve the relative rotation of the guide 420 and the hammer 410, the impact mechanism 40 further includes a support base 435 fixed in the housing 10, and a steel ball 436 supporting the guide 420 when the guide 420 rotates is further provided between the support base 435 and the guide 420. Thus, when the guide member 420 can rotate, the friction between the guide member 420 and the support base 435 is small.

In this embodiment, as shown in fig. 3, a baffle 4341 is sleeved on the impact structure shaft 434, that is, the baffle 4341 is sleeved on the outer peripheral wall of the impact structure shaft 434, the energy storage element 431 is located between the hammer 410 and the baffle 4341, and an end of the energy storage element 431 away from the hammer 410 may be engaged with the baffle 4341. When ram 410 moves a distance toward energy storage element 431, ram 410 and stop 4341 may compress energy storage element 431. Thus, energy accumulating element 431 can exert an urging force on ram 410. The energy storage member 431 may be a spring, and one end of the spring is installed in a cavity formed in the hammer 410.

In other embodiments, the second guide 433 is a cam groove fixedly provided to the guide 420. The ball screw-moves in the cam groove, thereby achieving the reciprocating motion of the hammer 410 in the axial direction of the tool spindle 50. At this time, the hammer 410 may be fitted over the outside of the guide 420, and the first guide 432 is provided on the inner circumferential surface of the hammer 410.

In the above embodiment, the second guide 433 functions as a curved guide so that the hammer 410 can move along the curved guide when rotating relative to the guide 420. The first guide member 432 is a conversion member of the movement of the hammer 410.

Referring to fig. 1 and 2, the mode adjustment mechanism 60 includes an impact switch 610 and a mode switch 620. The mode switching member 620 is operatively moved between a first position and a second position to enable the impact switching member 610 to be engaged with or disengaged from the guide member 420. As shown in fig. 7 and 8, when the mode switching member 620 is at the first position, the impact switching member 610 engages with the guide member 420, the guide member 420 is fixed with respect to the housing 10, and the hand-held power tool enters the impact mode; as shown in fig. 9 and 10, when the mode switching member 620 is moved to the second position, the impact switching member 610 is separated from the guide member 420, the guide member 420 is rotatable with respect to the housing 10, and the hand-held power tool enters the non-impact mode.

In the present embodiment, the mode switching member 620 is rotatably provided with respect to the housing 10, and the impact switching member 610 is driven to move axially by rotation. In this way, the operation space of the mode switching member 620 can be reduced. In this manner, when switching between the second position and the first position, the mode switching member 620 is rotated by a certain angle to realize the position switching. Of course, the mode switching member 620 may be axially moved relative to the housing 10 to change the position thereof, thereby driving the impact switching member 610 to axially move.

As shown in fig. 5 and 6, the impact switching member 610 is provided with first fixing teeth 611, the guide member 420 is provided with second fixing teeth 421, and the mode switching member 620 rotates with respect to the housing 10 and drives the impact switching member 610 to move along the center line axis X to engage or disengage the first fixing teeth 611 with or from the second fixing teeth 421. As shown in fig. 5, when the first fixing teeth 611 are engaged with the second fixing teeth 421, the impact switch member 610 may restrict the movement of the guide member 420, the guide member 420 is fixed with respect to the housing 10, and the hand-held power tool enters the impact mode. As shown in fig. 10, when the first fixing teeth 611 are separated from the second fixing teeth 421, the guide member 420 is rotatable with respect to the housing 10, and the hand-held power tool enters the non-impact mode.

Further, the first fixing teeth 611 and the second fixing teeth 421 are respectively provided as ratchet teeth having abutting surfaces, when the first fixing teeth 611 and the second fixing teeth 421 are engaged, the first abutting surfaces 6111 of the first fixing teeth 611 and the second abutting surfaces 4211 of the second fixing teeth 421 abut against each other, and the first fixing teeth 611 guide the rotation of the guide member 420 only in one direction. Thus, when the first fixing teeth 611 are coupled with the second fixing teeth 421, the impact switch member 610 can restrict only the one-way rotation of the guide member 420. That is, assuming that the impact switch 610 can restrict the guide 420 from rotating clockwise as viewed in fig. 5, when the impact structure shaft 434 rotates clockwise (hereinafter referred to as forward rotation or rotation in the first rotation direction), the first guide climbs along the climbing section 4331, falls from the falling section 4332 to the lowest point of the next climbing section when moving to the highest point of the climbing section 4331, and so on, the hammer 410 may move axially; when the impact structure shaft 434 rotates counterclockwise, the first guide part 432 cannot move from the lowest point of one climbing section 4331 to the highest point of the other climbing section 4331, the first guide part 432 is locked at the falling section 4332, the impact switching part 610 cannot limit the guide part 420, the guide part 420 rotates along with the hammer 410, and the hammer 410 does not rotate relative to the guide part 420, so the first guide part 432 is not locked at the guide part 420, that is, the motor can be prevented from being locked when rotating in the reverse direction (or simply referred to as the second rotating direction).

Further, in the present embodiment, when the first fixing teeth 611 are engaged with the second fixing teeth 421, the guide 420 and the impact switch 610 partially overlap in the axial direction of the tool spindle 50. Specifically, as shown in fig. 5, the position of the second fixing teeth 421 on the guide member 420 is close to the center in the axial direction of the guide member 420, so that, as shown in fig. 8, when the first fixing teeth 611 are engaged with the second fixing teeth 421, the guide member 420 and the impact switch member 610 partially overlap in the axial direction of the tool spindle 50. With this configuration, the movement space required for the guide member 420 and the impact switch member 610 in the axial direction of the tool spindle 50 can be reduced, resulting in a compact structure.

Further, the guide member 420 has a guide body 422. The guide body 422 has an outer peripheral surface 4221. The first fixing teeth 611 are convexly disposed on the outer circumferential surface 4221 of the guide body 422, and a gap is formed between the first fixing teeth 611 and an end of the outer circumferential surface 4221 close to the impact switch member 610. In this way, the impact switching member 610 may move toward the guide member 420 until being engaged with the second fixing teeth 421 or separated from the second fixing teeth 421, supported by the outer circumferential surface 4221, to ensure smooth and stable reciprocating movement of the guide member 420. Referring to fig. 6, the impact switch 610 is further provided with a mode coupling portion 613. Referring to fig. 11, the mode switching member 620 is provided with a mode guide 623. Referring to fig. 1 and 2, the mode adjustment mechanism further includes an elastic member 630 abutting against the impact switch member 610, the elastic member 630 providing the impact switch member 610 with a driving force to move the guide member 420 to a position of engagement with the guide member 420, and when the mode switch member 620 rotates from the first position in fig. 7 to the second position in fig. 9, the mode guide portion 623 drives the mode mating portion 613 to move against the urging force of the elastic member 630 to separate the impact switch member 610 from the guide member 420.

Referring to fig. 1 and 2, the hand-held power tool of the embodiment of the present application further includes a torque adjustment mechanism 70. The torque adjustment mechanism 70 includes a torque adjustment disc 710 movable along the central axis X, and a torque adjustment ring 720 that drives the torque adjustment disc 710 to move axially. In an embodiment of the present application, the torque adjustment disc 710 is locked or unlocked by the mode switch 620 such that the torque adjustment disc 710 can move in the axial direction to achieve adjustment of the torque output of the tool spindle 50. More specifically, when the mode switch 620 is axially separated from the torque adjustment disc 710, the torque adjustment disc 710 can move axially, thereby adjusting the torque output of the tool spindle 50, and the hand-held power tool enters the torque adjustment mode. When the mode switching member 620 is axially abutted against the torque adjusting disc 710, the torque adjusting disc 710 cannot axially move, the torque adjusting disc 710 cannot adjust the torque output of the tool spindle 50, and the hand-held power tool enters a non-torque adjusting mode.

With the torque adjustment mechanism 70, the hand-held power tool can further implement a torque adjustment mode and a no-torque adjustment mode at least in the non-impact mode, wherein the drill mode can be implemented without torque adjustment; when the torque force is adjusted, the screwdriver mode can be realized.

Specifically, when the mode switch 620 is in the second position shown in fig. 9, the hand-held power tool is in the non-impact mode, and the mode switch 620 axially abuts the torque adjustment disc 710 as shown in fig. 15, and the hand-held power tool is in the drill mode. At this time, when the mode switching member 620 is operated to move from the second position to the third position, the torque adjustment disk 710 and the mode switching member 620 are changed from the axial abutment to the axial separation, and the torque adjustment disk 710 can move in the axial direction of the tool spindle 50, so that the hand-held power tool enters the screwdriver mode. When the operation mode switching member 620 is rotatably disposed with respect to the housing 10, the mode switching member 620 rotates a certain angle when moving from the second position to the third position. Specifically, as shown in fig. 11 and 12, the inner surface of the mode switching member 620 is provided with a stopper 622 protruding inward, the torque adjustment disc 710 is provided with a protrusion 712 extending in the direction of the mode switching member, when the mode switching member 620 is at the second position, as shown in fig. 15, the protrusion 712 axially abuts against the stopper 622, the torque adjustment disc 710 cannot move axially, and the hand-held power tool is in the no-torque adjustment mode, and then enters the drill mode; when the mode switch 620 is in the third position, as shown in fig. 16, the protrusion 712 is axially separated from the stop 622, the torque adjusting disk 710 can move axially, and the hand-held power tool enters the torque adjusting mode, thereby implementing the screwdriver function.

Furthermore, with the torque adjustment mechanism 70, it is also possible to simultaneously implement a torque adjustment mode and a no-torque adjustment mode in the impact mode, wherein when there is no torque adjustment, the impact drill mode is implemented, and when there is torque adjustment, the impact screwdriver mode is implemented.

Specifically, when the mode switch 620 moves to the first position, the hand-held power tool enters the impact mode. As shown in fig. 14, when the protrusion 712 axially abuts the stopper 622, the torque adjustment disc 710 cannot axially move, and the hand-held power tool is in the no-torque adjustment mode, and then enters the hammer drill mode. As shown in fig. 17, when the protrusion 712 is axially separated from the stop 622, the torque adjustment disk 710 can move axially, and the hand-held power tool enters a torque adjustment mode, which can implement an impact screwdriver mode.

In the above embodiment, when the mode switch 620 moves to the first position, the hand-held power tool enters the impact mode, and the mode switch 620 is operated to axially abut against or separate the protrusion 712 from the stopper 622, thereby implementing the impact drill mode or the impact screwdriver mode. In another embodiment, when the mode switch 620 is moved to the first position, the torque adjustment dial 710 is axially separated from the mode switch 620, so that the hand-held power tool directly enters the impact screwdriver mode when switched to the impact mode, and the hand-held power tool has only three operating modes, i.e., the drill mode, the screwdriver mode, and the impact screwdriver mode.

In this embodiment, the impact switch 610 and the mode switch 620 are used to switch between four working modes, which are an impact screwdriver mode (a), a screwdriver mode (b), a drill mode (c), and an impact drill mode (d).

Specifically, referring to fig. 11, the guide block 621 of the mode switching member 620 has a first inclined surface portion 6211, a second inclined surface portion 6212 and a platform portion 6213 therebetween, wherein the platform portion 6213 is configured to axially abut against the fitting block 612 of the impact switching member 610. During the rotation of the mode switching member 620, the first inclined surface portion 6211 first contacts with the side portion of the guide block 621, and at this time, the impact switching member 610 keeps engaged with the guide member 420, the guide member 420 cannot rotate, the blocking portion 622 of the mode switching member 620 does not axially abut against the protrusion 712 of the torque adjustment disc 710, as shown in fig. 17, the torque adjustment is possible, and thus the hand-held power tool can be in the impact screwdriver mode (a).

When the mode switch 620 is further rotated, the platform portion 6213 moves to a position where it axially abuts against the engagement block 612 of the impact switch 610, the impact switch 610 is axially away from the guide member 420, at this time, the guide member 420 can be rotated, the impact mechanism 40 does not output an impact, at this time, the blocking portion 622 of the mode switch 620 does not axially abut against the protrusion 712 of the torque adjustment disk 710, as shown in fig. 16, a torque adjustment can be performed, and thus the hand-held power tool enters the screwdriver mode (b).

When the mode switching member 620 is further rotated, the land portion 6213 is rotated by a certain angle but still axially abuts against the engaging block 612 of the impact switching member 610, the guide member 420 can be rotated at this time, the impact mechanism 40 does not output an impact, and the blocking portion 622 of the mode switching member 620 is moved to a position axially abutting against the protrusion 712 of the torque adjustment disk 710 as shown in fig. 15, so that the torque adjustment cannot be performed, and the hand-held power tool enters the drill mode (c).

When the mode switching member 620 is rotated continuously, the platform portion 6213 is circumferentially displaced from the engagement block 612 of the impact switching member 610, the second inclined surface portion 621 contacts with the side portion of the guide block 621, the impact switching member 610 moves axially in the direction approaching the guide member 420, the guide member 420 is not rotatable, the impact mechanism 40 outputs an impact, and the blocking portion 622 of the mode switching member 620 still axially abuts against the position of the protrusion 712 of the torque adjustment disk 710, as shown in fig. 14, torque adjustment cannot be performed, and the hand-held power tool enters the impact drill mode (d).

In another embodiment, the structures of the guiding block 621 and the matching block 622 of the mode switching element 620 may be different, and the four operation modes can still be switched, but the sequence is different from the above embodiment.

For example, two sides of the guiding block 621 are respectively provided with one terrace portion 6213, and an inclined surface portion is formed between the two terrace portions. Thus, when the first terrace portion 6213 abuts against the engagement block 612 of the impact switch member 610, the impact mechanism 40 has no impact output, and the mode switch member 620 is arranged such that the stopper portion 622 does not axially abut against the protrusion 712 of the torque adjustment disk 710, so that the torque adjustment can be performed, and the screwdriver mode can be realized.

The mode switch 620 is rotated continuously to make the first platform part 6213 and the matching block 612 staggered in the circumferential direction, the inclined surface part moves to the position contacting with the side part of the guide block 621, the impact mechanism 40 has impact output, at this time, the blocking part 622 of the mode switch 620 does not abut against the bulge 712 of the torque adjusting disc 710 in the axial direction, and the torque adjustment can be carried out, so that the impact screwdriver mode can be realized.

When the mode switching member 620 is continuously rotated, the inclined surface portion is still in contact with the side portion of the guide block 621, the impact mechanism 40 outputs impact, the blocking portion 622 of the mode switching member 620 axially abuts against the protrusion 712 of the torque adjustment disk 710, torque adjustment cannot be performed, and an impact drill mode can be realized.

The mode switching member 620 is rotated continuously to make the second platform part 6213 axially abut against the fitting block 612 of the impact switching member 610, the impact mechanism 40 has no impact output, the blocking part 622 of the mode switching member 620 still axially abuts against the protrusion 712 of the torque adjusting disk 710, and the torque adjustment cannot be performed, so that the drill mode can be realized

Therefore, in another embodiment, four functions of a screwdriver, an impact drill and a drill can be realized, and the sequence of the four working modes is as follows: a screwdriver mode, a percussion drill mode, a drill mode.

As shown in fig. 21 and 22, the impact switch member and the mode switch member are respectively illustrated in the structure of another embodiment, and three kinds of operation modes can be switched, and the hand-held power tool has three functions.

Specifically, in another embodiment, as shown in fig. 21, the end surface of the impact switch member 610' is provided with first fixing teeth 611' and the outer circumference is provided with an engaging block 612 '. As shown in fig. 22, the inner circumferential surface of the mode switching member 620' is provided with a guide block 621' and a blocking portion 622 '. The guide block 621' has only one bevel portion 6211 ' and a land portion 6213 '. The ramp portion 6211 'and the platform portion 6213' may be in a straight transition, or the ramp portion 6211 'may extend directly to engage with the platform portion 6213'.

During the rotation of the mode switching member 620', when the mode switching member 620' rotates until the inclined surface portion 6211 ' contacts the guide block 621', the impact switching member 610' is engaged with the guide member 420, the guide member 420 cannot rotate, and the impact mechanism 40 outputs torque; as shown in fig. 23, the blocking portion 622 'of the mode switching member 620' does not axially abut against the protrusion 712 of the torque adjustment disk 710, and torque adjustment is possible, so that the hand-held power tool is in the impact screwdriver mode.

Continuing to rotate the mode switch 620 'so that the land portion 6213' axially abuts the engagement block 612 'of the impact switch 610', the impact switch 610 axially moves away from the guide 420, at which time the guide 420 can rotate and the impact mechanism 40 does not output an impact; as shown in fig. 25, the stopper 622 of the mode switching member 620 axially abuts against the protrusion 712 of the torque adjustment disk 710, and the torque adjustment is impossible, so that the hand-held power tool is in the drill mode.

The mode switching member 620 'continues to be rotated, and the land portion 6213' continues to axially abut against the engagement block 612 'of the impact switching member 610', at which time the guide member 420 can be rotated, and the impact mechanism 40 does not output an impact; at this time, as shown in fig. 20, the stopper 622 of the mode switch 620 does not axially abut against the protrusion 712 of the torque adjustment disk 710, and the torque adjustment is possible, so that the hand-held power tool is in the screwdriver mode.

Therefore, in another embodiment, three operation modes that can be realized are: the impact screwdriver mode, the drill mode and the screwdriver mode realize three functions of impacting the screwdriver, drilling and screwdriver.

In all of the above embodiments, the hand-held power tool is capable of implementing an impact screwdriver mode. In the impact screwdriver mode, the tool spindle 50 can perform reciprocating impact motion and the torque thereof can be adjusted, so that when a screw nailing operation is performed, the impact force of the tool spindle 50 is utilized to smoothly drive a screw into a target and perform a screw screwing operation without requiring an operator to apply a large downward pressure.

In addition, after the screw is driven into the target, the impact force of the tool spindle 50 can still be utilized during screw screwing, so that the tool head 200 can be always kept in contact with the target without applying a large downward pressure by an operator, the phenomenon that the tool head 200 slips due to insufficient downward pressure is avoided, the abrasion of the tool head 200 is reduced, and the effect is particularly obvious when the tool head 200 is in a cross shape or a straight shape.

To sum up, when working on objects of different properties (such as wood and walls) by using the impact screwdriver mode, the impact force of the tool spindle 50 can be used to smoothly drive the screw into the object and prevent the tool bit 200 from slipping during screwing.

In all of the above embodiments, the adjustment of the output torque of the tool spindle 50 can be achieved when the torque adjustment disc 710 moves axially. When the torque adjusting disk 710 moves, the positional relationship between the torque adjusting disk and the transmission mechanism 20 changes, and the torque applied to the tool spindle 50 by the transmission mechanism 20 is changed.

Specifically, the transmission mechanism 20 includes a ring gear 210 rotatably disposed in the housing 10, and a driving wheel 220 engaged with the ring gear 210 to transmit the torque of the motor 30 to the impact structure shaft 434. The torque adjustment mechanism 70 includes a torque adjustment member. The torque adjusting member is used for adjusting a resistance torque when the ring gear 210 rotates, so that the ring gear 210 rotates against different resistances, and further, the torque transmitted from the driving wheel 220 to the impact structure shaft 434 is adjusted, thereby adjusting the output torque of the tool spindle 50. Specifically, when the mode switching member 620 is changed from the axial abutment to the axial separation of the torque adjustment disc 710, the torque adjustment disc 710 may be moved in a direction away from the ring gear 210 along the central axis X of the tool main shaft 50, and the torque adjustment member is operable to change the acting force of the torque adjustment disc 710 on the ring gear 210 to achieve the adjustment of the output torque of the tool main shaft 50.

In some embodiments, the torque adjustment includes a torque adjustment ring 720. The torque adjustment ring 720 is axially movably but non-rotatably coupled to the housing 10 and changes the force of the torque adjustment disc 710 against the inner ring gear 210. In other words, the torque adjustment ring 720 and the housing 10 are relatively stationary and cannot rotate relative to each other in the circumferential direction of the impingement structure shaft 434. The torque adjustment ring 720 is movable relative to the housing 10 in the axial direction of the impingement structure shaft 434. For example, a guide block extending in the axial direction of the impact structure shaft 434 may be provided on the housing 10, the torque adjustment ring 720 is provided with a slide groove corresponding to the guide block, and the movement track of the torque adjustment ring 720 is guided by the cooperation of the guide block and the slide groove.

For example, as shown in fig. 1 to 3, 8, 9 and 20, in some embodiments, the torque adjustment disc 710 is in end surface contact with the ring gear 210 and applies an axial pressure to an end surface of the ring gear 210, so that the rotation resistance torque of the ring gear 210 can be adjusted by adjusting the rotation resistance torque of the torque adjustment disc 710. The torque adjustment mechanism 70 further includes a compression spring 730 located between the torque adjustment disc 710 and the torque adjustment ring 720. The end of the torque adjustment disc 710 facing the torque adjustment ring 720 is provided with a first positioning post 711, and the end of the torque adjustment ring 720 facing the torque adjustment disc 710 is provided with a second positioning post 721. Two ends of the pressure spring 730 are respectively sleeved on the first positioning column 711 and the second positioning column 721. When the torque adjusting ring 720 is driven to move towards the torque adjusting disc 710, the compression spring 730 is compressed, the larger the compression amount of the compression spring 730 is, the larger the axial pressure applied to the ring gear 210 by the torque adjusting disc 710 is, the larger the rotation resistance of the ring gear 210 is, the larger the rotation resistance torque is, when the ring gear 210 is limited to be incapable of rotating relative to the housing 10, the ring gear 210 corresponds to a part of the housing 10, at this time, the torque transmitted from the driving wheel 220 to the impact structure shaft 434 is the largest, and the handheld power tool is in a non-torque adjusting mode. As shown in fig. 20, an end of the torque adjustment disc 710 facing away from the torque adjustment ring 720 is provided with a crimp post 713. A ball 714 is arranged between the pressure connection post 713 and the end surface of the ring gear 210. The press stud 713 of the torque adjustment disc 710 presses on the end face of the ring gear 210 through the ball 714 to be able to provide axial pressure on the ring gear 210 while not affecting the rotation of the ring gear 210. When the torque adjusting ring 720 is driven to move away from the torque adjusting disc 710, the compression amount of the compression spring 730 is reduced, the axial pressure applied to the ring gear 210 by the torque adjusting disc 710 is reduced, the rotation resistance of the ring gear 210 is reduced, the output torque of the tool spindle 50 is reduced, and thus the adjustment of the output torque of the tool spindle 50 is realized.

Further, the torque adjustment mechanism 70 further includes a torque cover 740 for user manipulation to drive the movement of the torque adjustment ring 720.

In some embodiments, the torque cap 740 is rotatably disposed relative to the housing 10 and is configured to drive the torque adjustment ring 720 in an axial motion. For example, a threaded connection may be used between the torque housing 740 and the torque adjustment ring 720. For example, the torque cover 740 may be rotatably fitted over the outer portion of the torque adjustment ring 720, wherein the inner circumference of the torque cover 740 is provided with internal threads and the outer circumference of the torque adjustment ring 720 is provided with external threads. As such, when the torque cover 740 rotates, the torque adjustment ring 720 is driven to move in the axial direction of the impingement structure shaft 434, thereby adjusting the axial pressure applied by the torque adjustment disc 710 to the ring gear 210.

The following briefly describes the switching of four operation modes according to the embodiment of the present application with reference to the drawings.

As shown in fig. 2, the hand-held power tool is in the impact mode in which the impact switch member 610 of the mode adjustment mechanism 60 restricts the rotation of the guide sleeve 420, so that the hammer 410 of the impact mechanism 40 can move in the axial direction of the impact structure shaft 434 to be able to strike the impact structure shaft 434. At this time, the torque adjustment ring 720 is driven to move in the axial direction of the impact structure shaft 434 by rotating the torque cover 740, thereby adjusting the resistance torque when the ring gear 210 rotates, and achieving the torque adjustment in the impact mode, i.e., enabling the hand-held power tool to operate in the impact screw mode. If the torque adjustment disc 71 is pressed, i.e. the ring gear 210 cannot rotate in the direction of rotation, the hand-held power tool is switched to operate in the percussion drill mode.

If the drill mode or the screwdriver mode is to be set, the mode switching button 620 of the mode adjustment mechanism 60 is first operated to put the hand-held power tool into the non-impact mode as shown in fig. 3, in which the hammer 410 and the guide sleeve 420 can be rotated together, and the hammer 410 cannot be moved in the axial direction of the impact structure shaft 434 and cannot strike the impact structure shaft 434. Then, the axial pressure applied to the ring gear 210 by the torque adjustment disc 710 and the torque adjustment ring 720 is adjusted by rotating the torque cover 740, so that the hand-held power tool operates in a torque adjustment state, i.e., in a screwdriver mode; or to enable the hand-held power tool to work in a non-torque adjustment state, i.e. in a drill mode.

Obviously, it is understood that the operation mode switching sequence of the hand-held power tool is not limited to the above, and it is related to the operation mode in which the hand-held power tool is currently located and the switching intention of the operator.

Further, in a non-torque adjustment state, i.e., a state in which the motor 30 transmits the maximum torque to the striking mechanism shaft 434, the torque adjustment disc 710 presses the ring gear 210 so that the ring gear 210 cannot rotate regardless of the hammer drill mode or the drill mode, which the operator desires to be reliably ensured.

In addition, in practice, it is not desirable for the hammer 410 to perform a hammering action for all operating conditions after the hand-held power tool is switched to the impact mode. For example, when the operator desires that the tool head or tool spindle 30 not be loaded from an operating condition, the ram 410 does not produce a hammering action, i.e., when the tool is turned on but not operating, the hand-held power tool is expected to be on standby in a quieter state.

To this end, in some embodiments of the present application, as shown in fig. 18, the impact mechanism 40 is further provided with a clutch mechanism 440. In other words, the clutch mechanism 440 functions to transmit power between the impact structure shaft 434 and the hammer 410. The clutch mechanism 440 may engage the impact structure shaft 434 with the ram 410 or disengage the impact structure shaft 434 from the ram 410. When the clutch mechanism 440 can engage the impact structure shaft 434 with the hammer 410, the rotational motion of the impact structure shaft 434 is transmitted to the hammer 410, the impact structure shaft 434 rotates the hammer 410, when the clutch mechanism 440 disengages the two, the engagement between the clutch mechanism 440 and the hammer 410 is released, the impact structure shaft 434 does not rotate relative to the hammer 410, and the hammer 20 is stationary relative to the guide 420.

In some embodiments of the present application, the clutch mechanism 440 is configured to be closed by a force transmitted via the tool spindle 50. That is, whether the clutch mechanism 440 and the hammer 410 are in a matching relationship can be controlled by the tool spindle 50, and the tool spindle 50 can apply an external force to the clutch mechanism 440 to change the relationship between the clutch mechanism 440 and the hammer 410, for example, when the tool head or the tool spindle 50 is abutted to a working condition (i.e., when the tool spindle 50 is subjected to an axial load), the clutch mechanism 440 is closed, the hammer 410 is driven, and further, when the hammer 410 can reciprocate in the axial direction of the impact structure shaft 434, the handheld power tool can perform an impact action.

Referring to fig. 18 and 19, in some embodiments, clutch mechanism 440 includes a clutch member 441, a recess 4342 disposed on impact structure shaft 434 to receive clutch member 441, and a slot 510 disposed on tool spindle 50, wherein slot 510 includes an abutment 511. The clutch member 441 is moved by the tool spindle 50 in the axial direction of the impact structure shaft 434, and selectively engages with the slope portion 411 in the circumferential direction to transmit torque or disengage. It can be understood that when the clutch member 441 moves to a position where the slope portion 411 is locked in the circumferential direction, the striking structure shaft 434 can drive the hammer 410 through the clutch member 441, whereas when the clutch member 441 is separated from the slope portion 411, the striking structure shaft 434 does not drive the hammer 410 to rotate, thereby achieving cutting off the moving power of the hammer 410.

As shown in fig. 18, one end of the tool spindle 50 extends into the striking mechanism shaft 434, and the tool spindle 50 is provided with an abutting portion 511 for driving the clutch member 441 to move. The abutment 511 has a height in the radial direction of the tool spindle 50, so that the clutch 441 can be moved when the tool spindle 50 is moved axially. In this embodiment, the end of the striking mechanism shaft 434 away from the motor 30 is provided with a cavity 4343 having an opening. The tool spindle is arranged coaxially with the percussion mechanism shaft 434, and its end close to the motor projects into the cavity 4343 and is connected to the drive shaft in a relatively axially displaceable but non-rotatable manner. For example, the inner wall of cavity 4343 and the outer wall of the connecting end of tool spindle 30 are mated by axially extending splines to allow tool spindle 50 to move axially relative to impact structure shaft 434 and to rotate with impact structure shaft 434. With continued reference to fig. 18, the portion of the tool spindle 50 projecting into the cavity 4343 is provided with an abutment 510. The abutment 511 is located at least partially on one side of the clutch member 441 in the radial direction of the impact structure shaft 434 to axially abut against the clutch member 441.

Further, ram 410 is sleeved outside of impact structure shaft 434. The ramp portion 411 is provided on the inner circumferential surface of the hammer opposite to the striking mechanism shaft 434. Specifically, the ramp 411 is a curved surface extending in the circumferential direction, and blocks the clutch member 441 from rotating with the drive shaft in the circumferential direction. The clutch member 441 is preferably provided in a spherical or cylindrical shape, and has a smooth outer surface having a small frictional force during movement, thereby facilitating state switching of the clutch member 441.

Further, as shown in fig. 18, the bottom of the cavity 4343 is provided with a restoring member 4344 axially abutting against the tool spindle 50. Reset element 4344 provides a spring force that moves tool spindle 50 away from impact structure shaft 434. When the tool spindle 50 is not subjected to an axial load, the tool spindle 50 is in its first position, the clutch mechanism 40 is in a disengaged state, the impact structure shaft 434 does not transmit power to the ram 410, and the ram 410 is not able to rotate. When the tool spindle 50 moves to the second position toward the motor 30 against the resistance of the reset member 4344 by the axial load, the clutch mechanism 410 is in an engaged state, the clutch member 441 abuts against the slope portion 411 in the circumferential direction, and the hammer 410 is driven to rotate by the impact structure shaft 434. Therefore, in the impact mode, the hammer 410 only generates impact action when the tool spindle 50 is subjected to an axial load, and the hammer 410 does not rotate and does not generate hammering noise when no load is generated.

In order to prevent the first guide 432 from abutting against the falling section 4332 when the motor 30 rotates in the reverse direction (i.e. rotates in the second rotation direction), causing a failure such as motor burn-out, in other embodiments, the motor 30 only rotates in the forward direction (the first rotation direction) in the impact mode, i.e. the motor 30 does not rotate in the reverse direction in the impact mode. The power tool further includes a control means for controlling the motor 30 to rotate in the forward direction or the reverse direction, and the control means responds to the operation of the mode switching member 620 and controls the motor 30 to rotate in the forward direction when the mode switching member 620 is switched to the impact mode.

In one embodiment, the control device includes a forward/reverse switch 90 operable to control the motor 30 to rotate forward or reverse, and a first control unit (shown in the figure) that controls operation of the forward/reverse switch 90 and controls the motor 30 to rotate forward or reverse, the forward/reverse switch 90 being operable to switch between a first control position and a second control position in a non-impact mode (a screwdriver mode or a power drill mode), wherein the first control unit controls the motor 30 to rotate forward when the forward/reverse switch is in the first control position; when the forward/reverse rotation switch 90 is in the second control position, the first control unit controls the motor 30 to rotate reversely.

In one embodiment, the first control unit includes a first control circuit for controlling the motor 30 to rotate forward and a second control circuit for controlling the motor 30 to rotate backward, and when the forward/backward rotation switch 90 is located at the first control position, the first control circuit is turned on, and the motor 30 rotates forward; when the forward/reverse rotation switch 90 is located at the second control position, the second control loop is turned on, and the motor 30 rotates reversely; preferably, the reversible switch 90 is disposed adjacent the grip handle, and the direction of movement of the reversible switch 90 between the first control position and the second control position is disposed perpendicular to the axis of the motor 30 and toward the sides of the two half housings of the power tool to facilitate one-handed operation of the reversible switch 90 in the non-impact mode.

Referring to fig. 26, the control device further includes a linkage member 80 drivingly connected between the mode switching member and the forward/reverse rotation switch 90, and an elastic member 85 having one end abutting against the linkage member 80 and the other end abutting against the casing, when the forward/reverse rotation switch 90 is located at the second control position, the mode switching member 620 is switched to the impact mode, the mode switching member 620 drives the forward/reverse rotation switch 90 to move to the first control position through the linkage member 80, and at this time, the elastic member 85 is compressed under the action of the linkage member 80; the link is elastically restored by the elastic member 85 when the mode switching member 620 is switched to the non-impact mode.

With continued reference to fig. 26, the mode switching member 620 includes a reversing guide member 624 on an inner circumferential surface thereof, the linkage member 80 has a first mating portion 82 mating with the reversing guide member 624 and a second mating portion 81 mating with the forward/reverse reversing switch 90, and the forward/reverse switching switch 90 is provided with a guide member mating with the second mating portion 81, preferably, the guide member is configured as a guide post 91. When the mode switching member 620 is rotated in the direction of arrow E in the drawing, the reversing guide 624 and the first mating portion 82 are engaged so that the link member 80 can be moved in the direction of the motor shaft away from the tool head and close to the motor 30 by compressing the elastic member 85, while the second mating portion 81 is engaged with the guide post 91 so that the forward/reverse switch 90 can be moved in the direction of arrow F in the drawing (i.e., perpendicular to the motor shaft and in the direction of the side of the half shells) to switch the forward/reverse switch between the first control position and the second control position.

Referring to fig. 27-28, states (a) - (d) of fig. 27 show a schematic diagram of another embodiment in which when the power tool is in the non-impact mode and the motor is in the reverse rotation, the mode switching member 620 is switched from the non-impact mode to the impact mode and drives the link member 80 to move through the reversing guide member 624, so that the forward/reverse rotation switch 90 is switched to the forward rotation by the link member 80, that is, in the impact mode, the reversing guide member 624 moves from state (a) to state (d) along arrow p, and the link member 80 moves from state (a) to state (d) along arrow T under the action of the reversing guide member 624, so that the forward/reverse rotation switch 90 (guide post 91) moves along arrow R and the motor is switched to the forward rotation.

Preferably, the reversing guide 624 includes a first guide section 6241 and a second guide section 6242, the first mating portion 81 is a guide groove, and includes a first groove section 811 and a second groove section 812, when the power tool is in the non-impact mode and the motor 30 is in reverse rotation (i.e., the mode switch is in the first position and the forward/reverse rotation switch is in the second control position), the reversing guide 624 is operated to move along the arrow P from the state (a) of fig. 27 to the state (b) of fig. 27, the first mating portion 82 is abutted to the first guide section 6241, but the first guide section 6241 does not drive the link 80 to compress the elastic element 85 for movement; when the guide 624 continues to move in the direction of arrow P to the state (c), the link 80 compresses the elastic element 85 under the action of the second guide section 6242, so that the link drives the guide post 91 of the forward/reverse switch 90 to move in the direction of arrow R through the first groove section 811 of the link 80; when the guiding element 624 is driven to move from the state (c) to the state (d) continuously along the direction of the arrow P (i.e. the mode switching element moves to the second position), the guiding post 91 moves into the second slot section 812 (i.e. the forward/reverse switch 90 is located at the first control position), so that the power tool is in the impact mode and the motor rotates forward.

Fig. 28 (a ') - (d') show that when the power tool is in the non-impact mode and the motor is in the forward rotation (i.e., the mode switching member is in the first position and the forward/reverse switch 90 is in the second control position), the guide post 91 of the forward/reverse switch 90 is located in the second slot section 812, the mode switching member 620 is switched from the non-impact mode to the impact mode while the reverse guide member 624 drives the link member 80 to move, and the movement of the link member 80 does not affect the forward/reverse switch position.

Specifically, when the reversing guide 624 moves from the state (a ') shown in fig. 28 to the state (b ') shown in fig. 28, the first coupling portion 82 abuts against the first guiding section 6241, but the first guiding section 6241 does not drive the link 80 to compress the elastic element 85 for movement, so that the link 80 and the forward/reverse switch 90 are still in the positions shown in the state (a '); when the guide member 624 continues to be driven in the direction of the arrow P ' to move to the state (c '), the link member 80 compresses the elastic element 85 to move in the direction of the arrow T ' under the action of the second guide section 6242, and the guide column is always located in the second groove section 812, so that the movement of the link member 80 does not cause the forward and reverse switch to move; when the guide 624 continues to be moved in the direction of arrow P ' from state (c ') to state (d ') (i.e., the mode switch moves to the second position), the guide post 91 remains in the second slot segment 812, and the movement of the link 80 does not affect the guide post 91 (i.e., the guide post 91 is stationary and the link 80 moves relative to the guide post), so that the power tool is in the impact mode and the motor rotates in the forward direction. That is, in the impact mode, in which the reversing guide 624 moves from the state (a ') to the view (d') along the arrow p ', the link member 80 moves from the state (a') to the view (d ') along the arrow T' by the action of the reversing guide 624, and the forward/reverse switch is still at the position corresponding to the forward rotation.

Referring to fig. 29-30, in other embodiments, to achieve the non-impact mode, the motor 30 can optionally rotate in either a forward or reverse direction, but the motor 30 is in the forward rotation when the mode switching member 620 is switched to the impact mode, the control device further includes a detection element (not shown) and a second control unit (not shown), preferably, the detection element is a hall sensor, the control device further includes a magnet 88 coupled with the hall sensor 86, one of the magnet or the hall sensor 86 is disposed on the mode switching member 620, the other is disposed on the housing, when the mode switching member 620 is switched to the impact mode (i.e., when the mode switching member moves to the second position), the magnet 85 is closer to the hall sensor 86, and the hall sensor 86 generates and transmits a signal to the second control unit and controls the motor to rotate forward through the second control unit. It should be noted that, no matter the forward/reverse rotation switch is located at the first control position or the second control position, when the magnet 85 is close to the hall sensor 86 (i.e., the mode switching member moves to the second position), the hall sensor generates a signal and transmits the signal to the second control unit, and the motor performs forward rotation under the action of the second control unit, in other words, the second control unit controls the motor 30 prior to the first control unit controlling the motor 30, and when the mode switching member moves to the second position, the detection element transmits a corresponding control signal to the second control unit, and the second control unit controls the motor 30 to perform forward rotation.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A hand-held power tool, comprising:

a housing;

a motor disposed within the housing and capable of providing power;

the tool spindle is used for receiving the tool head to drive the tool head to work;

the impact mechanism can form impact on the tool spindle along a first axial direction under the driving of the motor, wherein the first axial direction is from the end of the motor to the end of the tool head along the motor axial direction; and

a control device for controlling the motor to change a rotation direction of the motor;

the hand-held power tool further comprises a mode adjustment mechanism capable of switching the power tool between at least an impact mode and a non-impact mode, the mode adjustment mechanism comprising a mode switch member operable to move between a first position and a second position, the hand-held power tool being in the non-impact mode when the mode switch member is in the first position, the impact mechanism generating no axial impact to the tool spindle, and the motor being selectively rotatable in a first rotational direction or a second rotational direction opposite to the first rotational direction under the action of the control means; when the mode switching piece is in the second position, the handheld power tool is in an impact mode, the motor can only rotate in a first rotating direction under the action of the control device, and the impact mechanism can impact the tool spindle in the first axial direction.

2. The hand-held power tool of claim 1, wherein the control means is responsive to movement of the mode switch from the first position to the second position and controls the motor in only the first rotational direction.

3. The hand-held power tool of claim 1, wherein the impact mechanism includes a hammer, a guide, a first guide provided on the hammer, a second guide provided on the guide, and an energy accumulating element in elastic abutment with the hammer; in an impact mode, the hammer can rotate around a first rotating direction relative to the guide piece, the hammer overcomes the acting force of the energy storage element under the action of the first guide piece and the second guide piece and moves along a second axial direction opposite to the first axial direction, and the energy storage element can drive the hammer to move towards the first axial direction to impact the tool spindle; in the non-impact mode, the hammer and the guide piece do not rotate relatively, and the hammer does not impact the tool spindle.

4. The hand-held power tool of claim 1 or 2, wherein the control means comprises a forward and reverse switch operable to move at least in a first control position and a second control position, and a linkage member provided between the mode switching member and the forward and reverse switch, the motor being rotated in a first rotational direction when the forward and reverse switch is in the first control position; when the forward and reverse rotation switch is at a second control position, the motor rotates along a second rotation direction; when the mode switching piece is located at the first position, the forward and reverse rotation switch can selectively move to the first control position or the second control position, and when the mode switching piece moves from the first position to the second position, the forward and reverse rotation switch is driven to the first control position by the linkage piece.

5. The hand held power tool of claim 4, wherein during the operation of the reversible switch in the first control position and the mode switch being operated from the first position to the second position, the linkage member is moved relative to the reversible switch by the mode switch while the reversible switch remains in the first control position.

6. The hand-held power tool according to claim 4, wherein the control device further comprises an elastic member having one end elastically abutted against the link member and the other end elastically abutted against the housing, the link member is moved against the urging force of the elastic member by the mode switching member when the mode switching member is switched from the first position to the second position, and the link member is reset by the elastic member when the mode switching member is returned to the first position.

7. The hand-held power tool of claim 5, wherein the reversible switch is provided with a guide post, the linkage member is provided with a guide groove matched with the guide post, and the guide groove can drive the reversible switch to switch from the second control position to the first control position through the guide post when the mode switching member is switched from the first position to the second position; when the forward and reverse rotation switch is in the first control position, in the process of operating the mode switching piece from the first position to the second position, the guide groove moves relative to the guide column, and the guide column is fixed relative to the shell in the guide groove, so that the forward and reverse rotation switch is still in the first control position.

8. The hand-held power tool of claim 3, wherein the control device further comprises a first control unit that controls the motor to rotate in a first rotational direction when the forward/reverse control switch is in the first control position and in a second rotational direction when the forward/reverse control switch is in the second control position, the control device further comprises a detection element that sends a detected signal to the second control unit when the mode switching member is switched to the second position, and the second control unit controls the motor to rotate forward in preference to the first control unit.

9. The hand-held power tool according to claim 1, wherein the control device further comprises a detection member, a second control unit connected to the detection member, the detection member sending a detected signal to the second control unit and controlling the motor to perform forward rotation by the second control unit when the mode switching member is switched to the second position.

10. The hand-held power tool according to claim 8 or 9, wherein the detecting element is a hall sensor, and the control device further comprises a magnet provided to the mode switching member and capable of moving with the mode switching member at the time of mode switching.