JP6905558B2 - Output type switching device with a speed change mechanism - Google Patents

Description

The present invention relates to an output type switching device applied to a power tool. More specifically, the switching device can switch between electric drill mode, ram drill mode, and impact driver mode, and can also switch the rotation speed. The present invention relates to an output type switching device having a speed change mechanism that automatically switches to high-speed rotation when the impact driver mode is switched to in a low-speed rotation state.

In the conventional structure of a power tool used for drilling, locking, and the like, the power of a motor is transmitted to an output shaft by a gear system to output the power. Also, power tools for tightening screws, smoothly removing fastened screws, and some types of drilling and locking are further equipped with vibration shock function. This allows the screw to be tightened more at the moment it is tightened, or to be removed more easily at the moment it is unscrewed.

In the conventional patent documents, for example, in Patent Document 1, continuous rotation (electric drill mode), axial vibration generated at the same time as rotation (ram drill mode), and rotation so as to give an impact in both directions. A switching device for switching between three types of output modes such as (impact driver mode) is described.

Taiwan Registered Utility Model No. M394214

However, since the conventional switching device described above outputs power at a single rotation speed regardless of which output mode is switched to, the user can perform low speed rotation, high torque, or high speed depending on the actual usage conditions. It is not possible to select and operate low rotational torque.

Therefore, the present inventor considers that the above-mentioned drawbacks can be improved, and as a result of repeated studies, he / she has come up with a proposal of the present invention for effectively improving the above-mentioned problems with a rational design.

In view of such conventional circumstances, an object of the present invention is to provide an output type switching device applied to a power tool. That is, the rotation speed can be switched other than switching between the electric drill mode, the ram drill mode, and the impact driver mode, and when the impact driver mode is switched to in the low speed rotation state, the rotation speed is automatically changed to high speed. It can be switched to accommodate actual usage conditions.

In order to solve the above problems, an output type switching device having a speed change mechanism according to an embodiment of the present invention has a sun gear and a planetary gear plate that is driven and rotated by a plurality of first planetary gears via an input shaft. It includes a power input unit including, a rotation speed switching unit, an impact drive unit, and an output mode switching unit.

The rotation speed switching unit has a housing having an internal space and a V-shaped groove formed in the housing, a plurality of second planetary gears are installed at one end, and a ball is internally provided on the outside. A switch having a camshaft, an inner ring gear, a slidable ring gear that is axially slidably combined with the internal space of the housing, and a switch that is connected to the slidable ring gear and has at least one protruding bar. An arm, a switching button movably installed in the housing and connected to the switching arm, and a switching bar movably installed in the housing and connected to the switching button, and the protruding bar of the switching arm slides. Includes a sliding switching ring provided with at least one guide slot that is movably combined.

The impact drive unit has a cylindrical shape, and is installed on the camshaft and a positioning housing in which an annular groove is formed on the outside and a sliding groove extending in the axial direction is formed on both inner walls facing each other. At one end, two convex portions extending in the axial direction are formed, and the convex portions are formed by a positioning washer capable of sliding in the axial direction so as to enter the sliding groove of the positioning housing, and the ball. A ram that is connected to the camshaft so as to be driven and rotated, and has protrusions formed on both sides of the camshaft that are slidable in the axial direction so as to enter and exit the sliding groove of the positioning housing. Equipped.

The output mode switching unit includes an outer casing provided with a guide slot curved so as to extend in the circumferential direction on both opposite sides and an extension groove extending linearly in the axial direction, and the guide of the outer casing. Two sliders each having a guide shaft that is slidably combined with the slot and slidably combined in the annular groove of the positioning housing, and slidably combined with the extension groove of the outer casing, the pole and Two ratchet sliders having locking blocks, a cam ring installed on the outer casing, a plurality of cam portions formed at one end for matching with the pole, and a plurality of convex portions provided on the outside, and a shaft. An output shaft in which a first ratchet that can move in a direction and a second ratchet that cannot move so as to face each other in the axial direction and are engaged with the first ratchet are installed and a contact portion is provided, and a circle inside. An arc-shaped groove and an upright groove are provided, and a through hole is provided in the side wall, and when combined with the outer casing, the arc-shaped groove is combined with the convex portion of the positioning washer, and the upright groove is formed of the cam ring. A knob that is combined with the convex portion and the through hole is slidably combined with the slider is provided.

In the present invention, when an operation is performed so that the switching button moves in the opposite first direction or the second direction and the switching ring is interlocked and rotated, the switching ring causes the switching arm to be operated by the guide slot. The slidable ring gear is guided to move forward or backward in the axial direction. When the slidable ring gear moves forward and engages the inner ring gear with the second planetary gear, the camshaft is driven and rotates at a low speed. When the slidable ring gear moves rearward and the inner ring gear is detached from the second planetary gear and meshes with the planetary gear plate, the camshaft is driven and rotates at high speed.

In the present invention, when the knob is operated so as to be positioned at the reference position, the locking block of the ratchet slider is detached from the first ratchet, and the sliding groove of the positioning housing is convex of the positioning washer. The camshaft is fitted into the portion, and the output shaft is driven and rotated by the ram and the contact portion, whereby the electric drill mode is set.

In the present invention, when the knob is operated so as to rotate from the reference position to the first angle, the cam ring is interlocked by the knob to rotate and push the ratchet slider, and the locking block is the locking block. Locked to the first ratchet, the camshaft drives and rotates the output shaft by the ram and the abutting portion, and at the same time, the first ratchet and the second ratchet vibrate relative to each other in the axial direction. This puts it in ram drill mode.

In the present invention, when the knob is operated so as to rotate from the reference position to the second angle, the sliding groove of the positioning housing is detached from the convex portion of the positioning washer, and the camshaft is V-shaped. The ram is driven by the groove and the ball to collide with the contact portion, thereby driving and rotating the output shaft, whereby the impact driver mode is set.

When the knob rotates until the knob enters the impact driver mode under a low speed output state in which the inner ring gear is meshed with the second planetary gear, one end of the arcuate groove of the knob pushes the convex portion of the switching ring. The switching ring is moved to rotate the switching ring, and the switching ring is moved rearward in conjunction with the slidable ring gear by making full use of the switching arm, and the inner ring gear is detached from the second planetary gear. It is meshed with the planetary gear plate, whereby the camshaft is switched from the low speed rotation state to the high speed rotation state.

When the knob rotates until the knob enters the impact driver mode under a high-speed output state in which the inner ring gear is meshed with the planetary gear plate, one end of the arcuate groove of the knob pushes the convex portion of the switching ring. The slidable ring gear is kept in a high speed output state in which the inner ring gear is meshed with the planetary gear plate.

In the switching device according to the present invention, in addition to switching between the electric drill mode, the ram drill mode, and the impact driver mode, the rotation speed switching unit is toggled with a switching button in the electric drill mode and the ram drill mode. This causes the output shaft to be switched between high-speed rotation and low-speed rotation. Further, when the impact driver mode is switched in the low speed rotation output state, the low speed rotation is automatically switched to the high speed rotation. When the impact driver mode is switched in the high-speed rotation state, the high-speed rotation output state is maintained, and the practicality when applied to a power tool is further enhanced.

According to the present invention, the rotation speed can be switched other than switching between the electric drill mode, the ram drill mode, and the impact driver mode, and the rotation speed is high when the impact driver mode is switched to in the low speed rotation state. It can be automatically switched to and can be adapted to the actual usage situation.

It is an external perspective view which shows the output type switching apparatus which has the speed change mechanism which concerns on one Embodiment of this invention. It is a perspective exploded view which shows the combination relation | combination relationship of the important member of this invention. It is a perspective enlarged view which shows the combination relation | combination relationship of the member of the power input unit of this invention. It is a perspective enlarged view which shows the combination relation | combination relationship of the member of the rotation speed switching unit of this invention. It is a perspective enlarged view which shows the combination relation | combination relationship of the member of the impact drive unit of this invention. It is a perspective enlarged view which shows the combination relation | combination relationship of the member of the output mode switching unit of this invention. FIG. 5 is a schematic external view in which the knob of the present invention is rotated until it enters the drill mode. It is a top view sectional view that the knob of this invention is rotated until it enters a drill mode. It is a top view from before the knob of this invention is rotated until it enters a drill mode. FIG. 5 is a schematic external view in which the knob of the present invention is rotated until it is in ram drill mode. It is a top view sectional view that the knob of the present invention is rotated until it enters the ram drill mode. It is a top view from before the knob of the present invention is rotated until it enters the ram drill mode. FIG. 5 is a schematic view of the appearance of the knob of the present invention being rotated into the impact driver mode. It is a top view from the top that the knob of the present invention is rotated until it enters the impact driver drill mode. It is a top view from before the knob of this invention is rotated until it enters the impact driver drill mode.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Needless to say, the present invention is not limited to the following examples, and can be arbitrarily modified without departing from the gist of the present invention. Further, the "first end" described below for different members all refers to the same direction, and the so-called "second end" refers to the direction opposite to the first end.

The output type switching device having a speed change mechanism according to the present invention is a device applied to an electric tool (for example, an electric drill) that outputs rotational power, and continuously rotates the output shaft of the electric tool (electric drill mode). It is used to switch between three types of power output modes, such as generating axial vibration at the same time as rotation (ram drill mode) and rotating so as to give an impact in both directions (impact driver mode).

In addition, the output shaft is switched between high-speed rotation and low-speed rotation in the electric drill mode and the ram drill mode. When the impact driver mode is switched to in the low-speed rotation output state, the low-speed rotation is automatically switched to the high-speed rotation, and when the impact driver mode is switched in the high-speed rotation state, the high-speed rotation output state is maintained unchanged. ..

Next, the output type switching device having the speed change mechanism of the present invention will be described in detail with reference to FIGS. 1 to 6. It includes a power input unit 1, a rotation speed switching unit 2, an impact drive unit 3, and an output mode switching unit 4 (see FIG. 2). By combining the power input unit 1, the rotation speed switching unit 2, the impact drive unit 3, and the output mode switching unit 4, the appearance form shown in FIG. 1 and the structure shown in FIGS. 8 and 9 are configured. ..

As shown in FIGS. 2 and 3, the power input unit 1 of the present invention includes an input shaft 10, an end cover 11, a gasket 12, a fixed ring gear 13, a plurality of first planetary gears 14, and a planetary gear plate. 15 and.

The planetary gear plate 15 is a member for connecting the rotation speed switching unit 2, and the sun gear 152 is installed on the first side in the axial direction of the planetary gear plate 15 and in the axial direction on the opposite second side. A plurality of extended first planetary gear shafts 151 are installed. Each first planetary gear shaft 151 is penetrated into the first planetary gear 14. The fixed ring gear 13 has a ring gear portion 132 inside, and a plurality of ribs 131 along the circumference on the outside. Each of the first planetary gears 14 combined with the planetary gear plate 15 is combined in the radial direction of the fixed ring gear 13 and meshed with the ring gear portion 132.

The input shaft 10 having a shaft gear on the outside is meshed with each first planetary gear 14 at the center position after penetrating the end cover 11 and the gasket 12, and the transmission mechanism of the input shaft 10 is driven by a motor (not shown). As a result, when the input shaft 10 is driven and rotated, each of the first planetary gears 14 is interlocked to rotate the inner circumference of the fixed ring gear 13, and at the same time, the planetary gear plate 15 also rotates together.

Further, as shown in FIGS. 2 and 4, the rotation speed switching unit 2 of the present invention is a mechanism for being connected to the power input unit 1 and switching to a high-speed rotation output or a low-speed rotation output. It includes a switching button 21, a switching ring 22, a camshaft 24, a slidable ring gear 26, a plurality of second planetary gears 27, and a switching arm 28. The housing 20 is a tubular body having an internal space, and linear slots 201 extending along the axial direction are provided on both sides of the housing 20 facing each other, and the housing 20 is provided on both sides facing each other in the tangential direction on the outside. A positioning slot 202 is formed along the line.

The camshaft 24 is mounted in the housing 20 so as to fit the bearing 25 and is a member for connecting the planetary gear plate 15. The first end of the camshaft 24 is an elongated shaft body, and the second The end has a disk 241. A plurality of second planetary gear shafts 242 extending in the axial direction are installed at the second end of the disk 241, and each second planetary gear shaft 242 is penetrated into the second planetary gear 27. Further, a V-shaped groove 244 is formed on the outside of the camshaft 24, and a plurality of balls 245 are internally provided in the V-shaped groove 244. For example, in the present invention, two balls 245 are installed. A polygonal shaft 243 is further formed at an appropriate position on the camshaft 24, and the number of sides of the polygonal shaft 243 is unlimited, and in the embodiment of the present invention, it is a quadrangular shaft.

The slidable ring gear 26 exhibits an annular body, has an inner ring gear 262 inside, an annular groove 261 extending along the circumference is provided on the outside, and is distributed around the circumference on the outside. A plurality of dentate portions 263 are provided. After the switching arm 28 in which the metal rod is formed into an arc shape is mounted on the annular groove 261, it is mounted in the internal space of the housing 20 together with the slidable ring gear 26, and the slidable ring gear 26 is the tooth. The shape portion 263 is axially slidably combined with a gear recess (not shown) formed on the wall surface of the internal space of the housing 20, whereby the slidable ring gear 26 reciprocates in the housing 20 in the axial direction. However, it becomes impossible to rotate.

After the slidable ring gear 26 moves in the first direction in the housing 20, the inner ring gear 262 meshes with each second planetary gear 27, and after moving in the second direction, the inner ring gear 262 moves in each second planetary gear 27. It is detached from the planetary gear plate 15 and meshed with the planetary gear plate 15. Protruding bars 281 extend from both ends of the arc-shaped switching arm 28, whereby the switching arm 28 and the slidable ring gear 26 are both mounted in the housing 20, and then the two protruding bars 281 are formed. It is penetrated through the slots 201 on both sides of the housing 20 from the inside to the outside of the housing 20, and the protruding bar 281 reciprocates along the slot 201.

Both the switching button 21 and the switching ring 22 are movably installed in the housing 20 and are used for controlling the connection and controlling the movement of the switching arm 28. The switching button 21 is an arc-shaped plate-like body, and a toggle portion 211 is projected from the intermediate portion thereof, and the rotation speed after switching is low on the surface of the switching button 21 on both sides of the toggle portion 211. The numbers "1" and "2" used to indicate whether the rotation speed is high or high speed are provided. A plurality of engaging protrusions 212 for engaging with each other so as to be connected to the switching ring 22 are provided on both opposite sides of the switching button 21.

The switching ring 22 is a semi-cylindrical arc-shaped body, and a plurality of engaging holes 221 and guide slots 222 are provided on both sides of the main body of the switching ring 22 facing each other. Further, an elongated hole 224 is provided at an appropriate position, and the switching ring 22 is further formed with two convex portions 223 integrally formed at the end edge portion of the first end thereof. After both the switching button 21 and the switching ring 22 surround the outside of the housing 20, they are connected so as to be engaged and fixed to each other via the engaging protrusion 212 and the engaging hole 221, and the fixing pin 23 is attached. By penetrating the positioning slot 202 of the housing 20 and limiting the switching ring 22 to the housing 20, the switching button 21 and the switching ring 22 rotate and move with respect to the housing 20, and the protruding slot of the switching arm 28. Two protruding bars 281 are slidably combined with 201 to penetrate the guide slot 222.

The guide slot 222 has a predetermined bending angle or arc shape, whereby the guide slot 222 having the bending angle or arc shape moves when the switching button 21 is triggered and the switching ring 22 is interlocked to rotate. By doing so, the switching arm 28 is guided to move in the axial direction, and the slidable ring gear 26 is interlocked to move in the first direction and mesh with the second planetary gear 27, or in the second direction. It moves and detaches from the second planetary gear 27 and meshes with the planetary gear plate 15.

Further, as shown in FIGS. 2 and 5, the impact drive unit 3 is used to receive the power transmitted from the camshaft 24, and includes a ram 30, a positioning housing 31, a positioning washer 37, and a spring 35. , Equipped with. The positioning housing 31 has a cylindrical shape, and an annular groove 311 is formed on the outer side thereof, and a sliding groove 312 extending in the axial direction is formed on the opposite side walls inside the positioning housing 31. The positioning washer 37 is formed as a disc-shaped body, and a polygonal hole 371 corresponding to the polygonal shaft 243 of the camshaft 24 is formed at the center position thereof. Two convex portions 372 extending in the axial direction are formed on the edge of the first end of the positioning washer 37, and the convex portions 372 can slide in the axial direction so as to enter the sliding groove 312 of the positioning housing 31. Is.

Further, the ram 30 is a cylindrical body having a large weight, and projecting blocks 302 are formed on both sides of the first end surface facing each other, and are connected to the two projecting blocks 302 on both sides facing each other. At the same time, a protruding portion 3021 projecting from the outside of the ram 30 is formed, and the protruding portion 3021 can slide in the axial direction so as to enter and exit the sliding groove 312 of the positioning housing 31. A center hole 301 penetrating in the axial direction is formed in the center of the ram 30, and a ball recess (not shown) for accommodating the ball 245 is formed inside the center hole 301.

The camshaft 24 in the rotation speed switching unit 2 is mounted on the housing 20, penetrates the gasket 34b, the thrust bearing 38, and the polygonal hole 371 of the positioning washer 37 in order, and the positioning washer 37 is provided by the engaging ring 36. It is localized on the polygonal shaft 243 of the camshaft 24. After that, the camshaft 24 penetrates the spring 35, the gasket 34a, and the center hole 301 of the ram 30 in this order, and the ball 245 passes between the V-shaped groove 244 of the camshaft 24 and the ball concave groove of the center hole 301. A plurality of balls 33 are installed as bearings between the inner edge in the center hole 301 and the gasket 34a, which serves as a transmission medium between the ram 30 and the ram 30, and the protrusion 3021 of the ram 30 enters the sliding groove 312 of the positioning housing 31. Slide to.

As a result, when the protrusion 3021 enters the sliding groove 312, the camshaft 24 rotates so that the ram 30 is interlocked and rotates together with the positioning housing 31, and when the protrusion 3021 does not enter the sliding groove 312, the camshaft 24 Is rotated so that only the ram 30 is interlocked and rotated.

Further, as shown in FIGS. 2 and 6, the output mode switching unit 4 is used to receive the power transmitted from the impact drive unit 3, and includes an external casing 40, two sliders 406, and a cam ring 41. It includes two ratchet sliders 42, a first ratchet 44, a second ratchet 47, a spring 46, an output shaft 48, and a knob 49. The outer casing 40 is a tubular body, and an extension tube 401 is integrally extended from the first end thereof, and guide slots 404 curved so as to extend in the circumferential direction are provided on both sides of the outer casing 40, respectively. The mounting portion 405 is recessed in the outer casing 40 provided between the two guide slots 404.

Extension grooves 402 extending linearly in the axial direction are provided on both sides of the extension tube 401, and buckle grooves 403 are provided on the lower side wall surface of the extension tube 401. The mounting portion 405 is used for mounting the positioning spring 407 in the mounting portion 405, and the protrusion 4071 formed on the positioning spring 407 projects to the surface of the outer casing 40. The two guide slots 404 pass through the guide shaft 4061 of the slider 406, respectively, and at the same time, the guide shaft 4061 slides so as to be inserted into the annular groove 311 of the positioning housing 31, and the slider 406 slides along the guide slot 404. The guide shaft 4061 pushes the positioning housing 31 in the annular groove 311 so as to move in the axial direction.

Further, the cam ring 41 is an annular body, and a plurality of convex portions 411 are distributed on the outside thereof, and a plurality of cam portions 412 are formed toward the end edge of the first end, and the cam ring 41 is an extension of the outer casing 40. It is movably combined with the outside of the tube 401. The ratchet slider 42 has a pole 421 on one side and a locking block 422 on the other side, and two ratchet sliders 42 are loaded into the extension tube 401 and the pole 421 is extended. It is slidably combined with each of the grooves 402. After that, the U-shaped ring 408 is engaged with the buckle groove 403 formed on the outside of the extension tube 401 to prevent the ratchet slider 42 from detaching from the extension tube 401. A plurality of first unidirectional ratchets 441 are formed on the first end surface of the first ratchet 44, and a plurality of engaging blocks 442 are formed on the outer side. A plurality of second unidirectional ratchets 471 are formed on the second end surface of the second ratchet 47.

Further, the output shaft 48 is provided with a hole 484 in which a polygonal shaft 481 is formed at the second end and beads 485 are internally provided outside the first end. The second end of the output shaft 48 penetrates the bearing 43b, the gasket 45b, the second ratchet 47, the spring 46, the gasket 45a, the first ratchet 44, and the bearing 43a in this order, and then is combined in the outer casing 40 to be combined in the first ratchet 44. Moves axially on the output shaft 48, but the second ratchet 47 is immovable on the output shaft 48, and the first unidirectional ratchet 441 of the first ratchet 44 and the second of the second ratchet 47. The unidirectional ratchets 471 are axially opposed to each other and meshed.

After the output shaft 48 is mounted in the outer casing 40, the contact portion 32 is combined with the polygonal shaft 481 of the output shaft 48, and the contact portion 32 is used to fit the polygonal shaft 481. It has a rectangular hole 322, and abutting blocks 321 are formed on both sides of the abutting portion 32 facing each other. The first end of the output shaft 48 has an insertion hole 483 for combining a head of a tool such as a driver head or a drill head. A bush 486, a spring 487, a washer 488, and an engagement ring 489 are sequentially combined with the first end of the output shaft 48 to provide elasticity to the beads 485 as the spring 487 is combined with the bush 486 to move axially. The tool inserted into the insertion hole 483 is localized by the elastic beads 485.

Further, after the first end of the knob 49 penetrates the cover 492, the cover 492 is locked to the power tool main body (not shown), and the knob 49 is combined with the outer casing 40. An arcuate groove 493 and an upright groove 494 are provided inside the knob 49, and a through hole 491 is provided on the side wall. The arcuate groove 493 is a concave groove formed along the circumferential length at the second end inside the knob 49, and the upright groove 494 is axially at the second end inside the knob 49. It is a concave groove formed along a length extending along the first end. When the knob 49 is combined with the outer casing 40, the arcuate groove 493 fits into the convex portion 372 of the positioning washer 37, and the upright groove 494 fits into the convex portion 411 of the cam ring 41, and the through hole. 491 is slidably fitted to the slider 406. As a result, the mode of the output form is switched by rotating the knob 49.

Hereinafter, the operation method of the present invention will be further described.

《Switching between low speed rotation and high speed rotation》
In the present invention, two numbers "1" and "2" are provided on the surfaces of the switching buttons 21 on both sides of the toggle portion 211, respectively. Of these, "1" indicates low-speed rotation, and "2" displays high-speed rotation (see FIG. 7).

When the switching button 21 is moved in the direction of the number "1" and is operated so as to interlock and rotate the switching ring 22, the switching ring 22 guides the protruding bar 281 of the switching arm 28 by the guide slot 222. The slidable ring gear 26 is moved forward in the axial direction, and the inner ring gear 262 is meshed with the second planetary gear 27, whereby the gear ratio is changed to drive the camshaft 24 and reduce the speed. It becomes a rotation.

When the switching button 21 is moved in the direction of the number "2" and is operated so as to interlock the switching ring 22 and rotate in the opposite direction, the switching ring 22 causes the protruding bar 281 of the switching arm 28 by the guide slot 222. The ring gear 26, which is guided and slidable, is moved rearward in the axial direction, and the inner ring gear 262 is detached from the second planetary gear 27 and meshed with the planetary gear plate 15. At this time, the first planetary gear 27 installed on the disc 241 is directly driven by the input shaft 10 to rotate at high speed (see FIG. 8).

<< Output form of electric drill mode >>
As shown in FIGS. 7, 8 and 9, the present invention provides three types of pattern codes on the outer surface of the knob 49, "electric drill mode", "ram drill mode", and "impact driver mode". Are displayed respectively. Further, a triangular arrow symbol is provided at one position of the cover 492, making it easy to align the position with one of the symbols of the three types of modes. In the present invention, the electric drill mode shown in FIG. 7 is tentatively set as the reference position.

As shown in FIGS. 8 and 9, when the knob 49 is rotated until it enters the electric drill mode, the locking block 422 of the ratchet slider 42 is disengaged from the first ratchet 44 and each slip of the positioning housing 31. The groove 312 is fitted to each convex portion 372 of the positioning washer 37, the driven and rotating camshaft 24 rotates in conjunction with the ram 30, and the protruding block 302 of the ram 30 is the contact block 321 of the contact portion 32. The output shaft 48 is driven and continuously rotated by continuously contacting the camshaft, and the electric drill mode is set. In this electric drill mode, the user can operate the switching button 21 at any time by the above method to switch the output shaft 48 to the low speed rotation output or the high speed rotation output in the electric drill mode.

<< Output form of ram drill mode >>
As shown in FIGS. 10, 11 and 12, when the knob 49 is rotated until it enters the ram drill mode, the rotating knob 49 rotates the cam ring 41 in conjunction with the upright groove 494. The ratchet slider 42 is pushed and moved by the cam portion 412, and the locking block 422 of the ratchet slider 42 is locked to the engaging block 442 of the first ratchet 44 to fix the first ratchet 44 so as not to move. At this time, the camshaft 24 drives the ram 30 to interlock the contact portion 32, drives the output shaft 48 to rotate, and at the same time, the first ratchet 44 is fixed by the locking block 422, but the output shaft 48 The second ratchet 47 is fixed by the output shaft 48 and the spring 46 abuts in the axial direction.

As a result, when the output shaft 48 is rotated, the first unidirectional ratchet 441 of the first ratchet 44 and the second unidirectional ratchet 471 of the second ratchet 47 are in a state of being meshed with each other, and the axes facing each other by constantly bouncing. It generates directional vibration and enters ram drill mode. In this ram drill mode, the user can operate the switching button 21 at any time by the above method to switch the output shaft 48 to the low speed rotation output or the high speed rotation output in the ram drill mode.

《Impact driver mode output form》
As shown in FIGS. 13, 14 and 15, when the knob 49 is rotated until it enters the impact driver mode, the slider 406 interlocked by the knob 49 interlocks the positioning housing 31 and moves it in the axial direction. The sliding groove 312 is detached from each convex portion 372 of the positioning washer 37. At this time, the driven and rotating camshaft 24 drives the ram 30 by the V-shaped groove 244 and the ball 245 to collide with the contact portion 32, drives the output shaft 48 to rotate, and enters the impact driver mode.

In the process of switching to the impact driver mode, when the inner ring gear 262 is in a low speed output state in which each second planetary gear 27 is meshed with each other, when the knob 49 rotates to a specific angle, one end of the arcuate groove 493 is changed to the switching ring 22. The convex portion 223 of the above is pushed to rotate the switching ring 22, the switching ring 22 is interlocked so as to move the slidable ring gear 26 rearward by making full use of the switching arm 28, and the inner ring gear 262 is the second planet. The camshaft 24 is automatically switched from the low-speed rotation state to the high-speed rotation state by being disengaged from the gear 27 and meshed with the planetary gear plate 15, so that it corresponds to the actual ram drilling operation.

However, in the process of switching to the impact driver mode, when the inner ring gear 262 is in a high-speed output state in which it meshes with the planetary gear plate 15, one end of the arcuate groove 493 of the knob 49 comes into contact with the convex portion 223 of the switching ring 22. Therefore, the switching ring 22 does not move, and the slidable ring gear 26 is maintained in a high-speed output state in which the inner ring gear 262 is meshed with the planetary gear plate 15.

The above-described embodiment is merely for explaining the technical idea and features of the present invention, and an object of the present invention is to make a person familiar with the technical field understand the contents of the present invention and to carry out the present invention. It does not limit the scope of claims. Therefore, various improvements or modifications having similar effects made without departing from the spirit of the present invention shall be included in the claims described below.

1 Power input unit 10 Input shaft 11 End cover 12 Gasket 13 Fixed ring gear 131 Rib 132 Ring gear part 14 First planet gear 15 Planet gear plate 151 First planet gear shaft 152 Sun gear 2 Rotation speed switching unit 20 Housing 201 Slot 202 Positioning slot 21 Switching button 211 Toggle part 212 Engagement convex part 22 Switching ring 221 Engagement hole 222 Guide slot 223 Convex part 224 Long hole 23 Fixing pin 24 Cam shaft 241 Disc 242 Second planet gear shaft 243 Polygonal shaft 244 V-shaped groove 245 Ball 25 Bearing 26 Sliding Ring Gear 261 Ring Groove 262 Inner Ring Gear 263 Toothed Part 27 Second Planet Gear 28 Switching Arm 281 Projection Bar 3 Impact Drive Unit 30 Ram 301 Center Hole 302 Projection Block 3021 Projection 31 Positioning Housing 311 Ring groove 312 Sliding groove 32 Contact part 321 Contact block 322 Polygonal hole 33 Ball 34a Gasket 34b Gasket 35 Spring 36 Engagement ring 37 Positioning washer 371 Polygonal hole 372 Convex part 38 Thrust bearing 4 Output mode switching unit 40 External Gasket 401 Extension Tube 402 Extension Groove 403 Buckle Groove 404 Guide Slot 405 Mounting Part 406 Slider 4061 Guide Shaft 407 Positioning Spring 4071 Protrusion 408 U-shaped Ring 41 Cam Ring 411 Convex 412 Cam Part 42 Ratchet Slider 421 Pole 422 Locking Block 43a Bearing 43b Bearing 44 First ratchet 441 First one-way ratchet 442 Engagement block 45a Gasket 45b Gasket 46 Spring 47 Second ratchet 471 Second one-way ratchet 48 Output shaft 481 Polygonal shaft 482 Front end 483 Insertion hole 484 Hole 485 Bead 486 Bush 487 Spring 488 Washer 489 Engagement ring 49 Knob 491 Through hole 492 Cover 493 Arc groove 494 Upright groove

Claims (4)

A power input unit having a sun gear and including a planetary gear plate that is driven and rotated with a plurality of first planetary gears via a motor driven input shaft.
Rotation speed switching unit and
Impact drive unit and
Equipped with an output mode switching unit
The rotation speed switching unit is
A housing with an internal space and
A camshaft that is penetrated into the housing, has a plurality of second planetary gears installed at one end, and has a V-shaped groove having a ball internally installed in the outer diameter.
A slidable ring gear that has an inner ring gear and is slidably combined with the internal space of the housing in the axial direction.
A switching arm connected to the slidable ring gear and having at least one protruding bar.
A switching button movably installed in the housing and connected to the switching arm,
Includes a sliding switching ring that is movably installed in the housing and is connected to the switching button and provided with at least one guide slot that the protruding bar of the switching arm slidably combines.
The impact drive unit is
A positioning housing that has a cylindrical shape, has an annular groove on the outer diameter, and has sliding grooves extending in the axial direction on both side walls facing each other.
A positioning washer installed on the camshaft, one end of which is formed with two axially extending protrusions, the convex portion being axially slidable so as to enter the sliding groove of the positioning housing. When,
A ram that is driven by the ball and is connected to the camshaft so as to rotate, and has protrusions formed on both sides of the camshaft that are slidable in the axial direction so as to enter and exit the sliding groove of the positioning housing. And equipped with
The output mode switching unit is
An outer casing provided with guide slots curved to extend in the circumferential direction on both sides facing each other, and extension grooves extending linearly in the axial direction, respectively.
Two sliders each having a guide shaft that is slidably combined with the guide slot of the outer casing and slidably combined in the annular groove of the positioning housing.
Two ratchet sliders, each slidably combined with the extension groove of the outer casing and having a pole and a locking block,
A cam ring that is installed in the outer casing, has a plurality of cam portions formed at one end for matching with the pole, and has a plurality of convex portions on the outer diameter.
A first ratchet that can be moved in the axial direction and a second ratchet that cannot be moved so as to face each other in the axial direction and mesh with the first ratchet are installed, and an insertion hole for combining a tool head is provided. An output shaft having one end and a second end provided with a contact portion,
An arcuate groove and an upright groove are provided in the inner diameter, and a through hole is provided in the side wall. By combining with the outer casing, the arcuate groove is combined with the convex portion of the positioning washer, and the upright groove is formed. Provided a knob that is combined with the convex portion of the cam ring and the through hole is slidably combined with the slider.
When an operation is performed so that the switching button moves in the opposite first direction or the second direction and the switching ring is interlocked and rotated, the switching ring guides the switching arm by the guide slot and the switching arm is described. When the slidable ring gear is moved forward or backward in the axial direction and the slidable ring gear is moved forward to engage the inner ring gear with the second planet gear, the camshaft is driven. When the slidable ring gear moves rearward to disengage the inner ring gear from the second planet gear and mesh with the planet gear plate, the camshaft is driven. Rotates at high speed
When the knob is located at the reference position , the electric drill mode is set. In the electric drill mode, the locking block of the ratchet slider is detached from the first ratchet, and the sliding groove of the positioning housing is of the positioning washer. It is fitted to the convex portion, and the camshaft drives and rotates the output shaft by the ram and the contact portion .
When the knob rotates from the reference position to the first angle in one direction , the ram drill mode is set. In the ram drill mode, the cam ring is interlocked by the knob to rotate and push the ratchet slider. The locking block is locked to the first ratchet, and at the same time the camshaft drives and rotates the output shaft by the ram and the contact portion, the first ratchet and the second ratchet are axially oriented. Is vibrating relatively to
When the knob rotates from the reference position to a second angle in a direction opposite to the one direction , the impact driver mode is set. In the impact driver mode, the sliding groove of the positioning housing is the convex of the positioning washer. The camshaft is detached from the portion, and the camshaft drives the ram by the V-shaped groove and the ball to collide with the contact portion, thereby driving and rotating the output shaft .
When the knob rotates until the knob enters the impact driver mode under a low speed output state in which the inner ring gear is meshed with the second planetary gear, one end of the arcuate groove of the knob presses the convex portion of the switching ring. The switching ring is pushed to rotate the switching ring, and the switching ring moves rearward in conjunction with the slidable ring gear by making full use of the switching arm, and the inner ring gear is disengaged from the second planetary gear. Upon being released, it is meshed with the planetary gear plate, whereby the camshaft is switched from the low speed rotation state to the high speed rotation state.
When the knob rotates until the knob enters the impact driver mode under a high-speed output state in which the inner ring gear is meshed with the planetary gear plate, one end of the arcuate groove of the knob pushes the convex portion of the switching ring. An output type switching device having a speed change mechanism, wherein the slidable ring gear is maintained in a high-speed output state in which the inner ring gear is meshed with the planetary gear plate without being moved. A plurality of engaging protrusions are provided on both sides of the switching button, and a plurality of engaging holes corresponding to the engaging protrusions are provided on both sides of the switching ring. The speed change mechanism according to claim 1, wherein the button and the switching ring are connected to each other and fixed by being engaged with each other through the engaging protrusion. Output type switching device to have. The positioning washer has a polygonal hole at the center in the axial direction, the camshaft is formed with a polygonal shaft, and the polygonal hole and the polygonal hole are combined with each other to perform the positioning. The output type switching device having the speed change mechanism according to claim 1, wherein the washer is non-rotatably combined with the camshaft. A positioning spring is installed in the outer casing, a plurality of sawtooth portions arranged along the circumferential direction are provided on the inner diameter of the knob, the sawtooth portions come into contact with the positioning spring, and the knob is rotated. The output type switching device having the speed change mechanism according to claim 1, wherein the positioning spring is elastically bounced at the saw blade portion.

Images