Hand-held power tool device

Abstract

A hand-held power tool device is described which includes an output unit, a striker, and a rotary percussion receiver which is designed for establishing a transfer of rotary percussions between the striker and the output unit, at least during a rotary percussion operation. It is provided that the hand-held power tool device includes a rotary percussion switch-off device which is designed for interrupting the transfer of rotary percussions from the striker to the rotary percussion receiver, at least during a hammer percussion operation.

Claims

1. A hand-held power tool device, comprising: an output unit including a hammer percussion surface; a striker including a hammer percussion surface and at least two rotary percussion surfaces; a rotary percussion receiver for establishing a transfer of a rotary percussion between the striker and the output unit at least during a rotary percussion mode of the hand-held power tool device, the rotary percussion receiver being connected in a rotationally fixed manner to the output unit and including at least two rotary percussion surfaces; a rotary percussion switch-off device for interrupting the transfer of the rotary percussion from the striker to the rotary percussion receiver, at least during a hammer percussion mode of the hand-held power tool device; and a percussion spring configured to accelerate the striker in a direction of the output unit during the hammer percussion mode, wherein, during the rotary percussion mode, the striker delivers, in the direction of the output unit, at least one rotary percussion pulse from the at least two rotary percussion surfaces to the at least two rotary percussion surfaces of the rotary percussion receiver in a rotary direction of the output unit during the rotary percussion mode, and delivers at least one hammer percussion pulse in an axial direction of the output unit, wherein, during the hammer percussion mode, the striker delivers at least one rotary percussion pulse from the hammer percussion surface to the hammer percussion surface of the output unit in an axial direction of the output unit, wherein the rotary percussion switch-off device supports the rotary percussion receiver in an axially displaceable manner such that during the hammer percussion mode (i) the rotary percussion receiver is arranged in an axial position in which the at least two rotary percussion surfaces of the rotary percussion receiver are situated out of range of the at least two rotary percussion surfaces of the striker, and (ii) the hammer percussion surface of the striker axially impacts the hammer percussion surface of the output unit.

2. The hand-held power tool device as recited in claim 1, further comprising: a rotary drive shaft for rotationally driving the output unit, at least in a percussion drill mode.

3. The hand-held power tool device as recited in claim 2, further comprising: a rotary drive coupling for disconnecting the rotary drive shaft and the output unit, at least in a rotary percussion mode.

4. The hand-held power tool device as recited in claim 2, wherein the striker at least largely surrounds the rotary drive shaft on at least one plane.

5. The hand-held power tool device as recited in claim 2, further comprising: a striker drive shaft that at least largely surrounds the rotary drive shaft on at least one plane.

6. The hand-held power tool device as recited in claim 1, further comprising: a striker coupling for decoupling the striker, at least in a drill mode.

7. The hand-held power tool device as recited in claim 1, wherein during the hammer percussion operation the rotary percussion switch-off device moves the rotary percussion receiver into a position in which the at least two rotary percussion surfaces of the rotary percussion receiver are situated out of range of the at least two rotary percussion surfaces of the striker.

8. A hand-held power tool device, comprising: an output unit; a striker; a rotary percussion receiver for establishing a transfer of a rotary percussion between the striker and the output unit at least during a rotary percussion operation; a rotary percussion switch-off device for interrupting the transfer of the rotary percussion from the striker to the rotary percussion receiver, at least during a hammer percussion operation; and a percussion spring configured to accelerate the striker in a direction of the output unit during the hammer percussion operation, wherein the striker delivers, in the direction of the output unit, at least one rotary percussion pulse in a rotary direction of the output unit during the rotary percussion operation, and delivers at least one hammer percussion pulse in an axial direction of the output unit during the hammer percussion operation, a striker catch device that, at least during the hammer percussion operation, secures the striker, at least temporarily, in a rotationally fixed manner.

9. The hand-held power tool device as recited in claim 8, wherein the striker catch device rotatably unblocks the striker in a peripheral direction, at least during the rotary percussion operation.

10. A hand-held power tool device, comprising: an output unit; a striker; a rotary percussion receiver for establishing a transfer of a rotary percussion between the striker and the output unit at least during a rotary percussion operation; a rotary percussion switch-off device for interrupting the transfer of the rotary percussion from the striker to the rotary percussion receiver, at least during a hammer percussion operation; and a percussion spring configured to accelerate the striker in a direction of the output unit during the hammer percussion operation, wherein the striker delivers, in the direction of the output unit, at least one rotary percussion pulse in a rotary direction of the output unit during the rotary percussion operation, and delivers at least one hammer percussion pulse in an axial direction of the output unit during the hammer percussion operation, a chisel coupling for securing the output unit in a rotationally fixed manner in a chisel mode.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a hand-held power tool which includes a hand-held power tool device according to the present invention in a schematic sectional illustration.

(2) FIG. 2 shows the hand-held power tool device from FIG. 1 in a partial schematic side view.

(3) FIG. 3 shows the hand-held power tool device from FIG. 1 in an illustration from the front.

(4) FIG. 4 shows a striker drive shaft of the hand-held power tool device from FIG. 1 in a side view.

(5) FIG. 5 shows an alternative specific embodiment of the hand-held power tool device from FIG. 1 in a partial schematic side view.

(6) FIG. 6 shows a striker drive shaft of the hand-held power tool device from FIG. 5 in a side view.

DETAILED DESCRIPTION

(7) FIG. 1 shows a hand-held power tool 32a which includes a hand-held power tool device 10a according to the present invention, a drive unit 34a, a gear 36a, a tool chuck 38a, a hand-held power tool housing 39a, and a hand-held power tool battery 40a. Hand-held power tool battery 40a provides drive unit 34a with operating energy. Hand-held power tool battery 40a is connected to hand-held power tool housing 39a, and is detachable from same by an operator. Hand-held power tool housing 39a has a gun-like basic shape. Hand-held power tool housing 39a connects in each case a portion of hand-held power tool device 10a, of drive unit 34a, and of gear 36a. Tool chuck 38a is provided for securing an insertion tool 42a in the axial direction in a rotationally fixed manner. Gear 36a is provided for reducing a rotational speed of drive unit 34a to a rotational speed of tool chuck 38a. A gear ratio of gear 36a is settable in two stages. Drive unit 34a is provided for converting electrical energy originating from hand-held power tool battery 40a into a rotational motion.

(8) FIGS. 2 through 4 show hand-held power tool device 10a. Hand-held power tool device 10a includes an output unit 12a. Output unit 12a is connected in the axial direction to tool chuck 38a in a rotationally fixed manner. Output unit 12a is supported in hand-held power tool housing 39a in an axially displaceable and rotatable manner. Output unit 12a is designed as a tool spindle. Output unit 12a transfers a rotational motion, a rotary percussion pulse, and/or a hammer percussion pulse directly to tool chuck 38a during a work process.

(9) Hand-held power tool device 10a includes a striker 14a and a striker drive shaft 26a. Striker 14a is driven by striker drive shaft 26a during a rotary percussion operation and during a hammer percussion operation. Striker drive shaft 26a is designed as a hollow shaft. Striker 14a includes two curved tracks 44a, of which a first curved track 44a, facing the observer, is illustrated by a dotted line. The second of curved tracks 44a is situated symmetrically on an opposite side of striker drive shaft 26a. Curved tracks 44a of striker 14a are situated on an inner side of striker 14a. Striker drive shaft 26a includes two curved tracks 46a, illustrated by a dash-dotted line. Curved tracks 46a of striker drive shaft 26a are situated on a side of striker drive shaft 26a facing striker 14a, i.e., on an outer side of striker drive shaft 26a.

(10) Hand-held power tool device 10a includes two connecting means 48a which are provided for converting a rotational motion of striker drive shaft 26a into a rotary percussion motion and/or a hammer percussion motion of striker 14a. Only one of connecting means 48a is illustrated. Each of connecting means 48a extends in one of curved tracks 44a of striker 14a and in one of curved tracks 46a of striker drive shaft 26a. Hand-held power tool device 10 includes a percussion spring 50a which exerts a force on striker 14a in the direction of tool chuck 38a.

(11) Hand-held power tool device 10a includes a rotary percussion receiver 16a. Rotary percussion receiver 16a is connected in a rotationally fixed manner to output unit 12a during the rotary percussion operation. A rotary percussion switch-off device 18a of hand-held power tool device 10a supports rotary percussion receiver 16a in an axially displaceable manner. Rotary percussion switch-off device 18a has a groove which is introduced into rotary percussion receiver 16a, and a mechanism, not illustrated in greater detail and considered meaningful by those skilled in the art, for axially displacing rotary percussion receiver 16a. Rotary percussion receiver 16a is illustrated in a position which is displaced in the direction of tool chuck 38a, i.e., as during a hammer percussion operation. Rotary percussion receiver 16a is displaced into a position situated in the direction of striker 14a during the rotary percussion operation. Rotary percussion receiver 16a includes two rotary percussion surfaces 52a which striker 14a impacts during the rotary percussion operation, and in the process transfers the rotary percussion pulse to same.

(12) Striker 14a is movably supported in the peripheral direction during the rotary percussion operation. During the rotary percussion operation, connecting means 48a move striker 14a in a direction facing away from rotary percussion receiver 16a. In the process, connecting means 48a accelerate striker 14a in the peripheral direction. Striker 14a absorbs the rotary percussion pulse. Percussion spring 50a pushes striker 14a back in the direction of rotary percussion receiver 16a. Rotary percussion surfaces 54a of striker 14a impact rotary percussion surfaces 52a of rotary percussion receiver 16a and transfer the rotary percussion pulse to rotary percussion receiver 16a. In a rotary percussion operation, rotary percussion receiver 16a brings about a transfer of rotary percussions between striker 14a and output unit 12a by transferring the rotary percussion pulse from striker 14a to output unit 12a.

(13) Rotary percussion switch-off device 18a is provided for interrupting the transfer of rotary percussions from striker 14a to rotary percussion receiver 16a for the hammer percussion operation. For this purpose, rotary percussion switch-off device 18a moves rotary percussion receiver 16a into a position in which rotary percussion surfaces 52a of rotary percussion receiver 16a are situated out of range of rotary percussion surfaces 54a of striker 14a. A striker catch device 20a of hand-held power tool device 10a temporarily secures striker 14a in a rotationally fixed manner during the hammer percussion operation. Striker catch device 20a includes spring-loaded balls 53a which are provided for engaging with a groove in striker 14a which extends in the axial direction. Striker catch device 20a rotatably unblocks striker 14a in the peripheral direction during the entire rotary percussion operation. For this purpose, striker catch device 20a includes a mechanism, not illustrated in greater detail, which is considered meaningful by those skilled in the art.

(14) While striker catch device 20a secures striker 14a in a rotationally fixed manner during the hammer percussion operation, connecting means 48a move striker 14a against percussion spring 50a in a direction facing away from output unit 12a. When a force exerted by connecting means 48a on striker 14a in the peripheral direction exceeds a retaining force of striker catch device 20a, striker catch device 20a unblocks striker 14a. Percussion spring 50a accelerates striker 14a in the direction of output unit 12a. In the process, striker 14a rotates. Striker 14a impacts, with a hammer percussion surface 56a of striker 14a, a hammer percussion surface 58a of output unit 12a. In the process, striker 14a delivers the hammer percussion pulse to output unit 12a. Striker catch device 20a subsequently secures striker 14a once again in a rotationally fixed manner. Thus, striker 14a is provided for delivering a rotary percussion pulse during the rotary percussion operation, and for delivering a hammer percussion pulse during the hammer percussion operation, in the direction of output unit 12a.

(15) Hand-held power tool device 10a includes a rotary drive shaft 22a which is provided for rotationally driving output unit 12a in a percussion drill mode and in a drill and/or screw mode. Hand-held power tool device 10a includes a rotary drive coupling 24a which is provided for connecting rotary drive shaft 22a and output unit 12a in a rotationally fixed manner in the percussion drill mode and in the drill and/or screw mode. Rotary drive coupling 24a is provided for disconnecting rotary drive shaft 22a and output unit 12a in a rotary percussion mode and in a chisel mode. Striker 14a surrounds rotary drive shaft 22a on a plane which is oriented perpendicularly with respect to a rotational axis of rotary drive shaft 22a.

(16) Striker drive shaft 26a surrounds rotary drive shaft 22a on a plane which is likewise oriented perpendicularly with respect to a rotational axis of rotary drive shaft 22a. Hand-held power tool device 10a includes a striker coupling 28a which is provided for rotationally driving striker drive shaft 26a in the percussion drill mode, in the chisel mode, and in the rotary percussion mode. Striker coupling 28a is provided for decoupling striker 14a in the drill and/or screw mode by decoupling striker drive shaft 26a. In the present case, striker coupling 28a is designed partly in one piece with a gear stage 60a of hand-held power tool device 10a, which is provided for increasing a rotational speed of rotary drive shaft 22a to a rotational speed of striker drive shaft 26a. Alternatively, a gear stage could decrease a rotational speed of a striker drive shaft to a rotational speed of a rotary drive shaft.

(17) Hand-held power tool device 10 includes a chisel coupling 30a, schematically illustrated in FIG. 2, which is provided for securing output unit 12a in a rotationally fixed manner in the chisel mode.

(18) FIGS. 5 and 6 show another exemplary embodiment of the present invention. The following descriptions and the drawings are limited essentially to the differences between the exemplary embodiments; with regard to components denoted in the same way, in particular components having the same reference numerals, reference may basically also be made to the drawings and/or the description of the other exemplary embodiments in FIGS. 1 through 4. To differentiate between the exemplary embodiments, the letter a is added as a suffix to the reference numerals of the exemplary embodiment in FIGS. 1 through 4. In the exemplary embodiment in FIGS. 5 through 6, the letter a is replaced by the letter b.

(19) FIG. 5 shows a hand-held power tool device 10b which includes an output unit 12b, a striker 14b, a rotary percussion receiver 16b, a rotary percussion switch-off device 18b, a striker catch device 20b, and a striker drive shaft 26b. Rotary percussion switch-off device 18b is provided for bringing about a transfer of rotary percussions between striker 14b and output unit 12b in a rotary percussion operation. Rotary percussion switch-off device 18b is provided for interrupting the transfer of rotary percussions from striker 14b to rotary percussion receiver 16b in a hammer percussion operation.

(20) FIG. 6 shows striker drive shaft 26b. Striker drive shaft 26b includes two curved tracks 46b. Curved tracks 46b have identical curved shapes. Curved tracks 46b are offset by 180 degrees about a rotational axis of striker drive shaft 26b. Curved tracks 46b each have a spiral-shaped striker lift area 64b and a clearance area 66b. Clearance area 66b connects two ends of striker lift area 64b. Curved tracks 46b surround a rotational axis of striker drive shaft 26b over 360 degrees. Two connecting means 48b are guided in curved tracks 46b. When connecting means 48b are situated in clearance areas 66b, striker 14b is movable in the axial direction. Connecting means 48b are situated in positions which are unchangeable relative to striker 14b. Connecting means 48b are designed as balls which engage with a precise fit in recesses 62b in striker 14b.

(21) Striker 14b and rotary percussion receiver 16b have rotary percussion surfaces 54b, 52b, respectively. Rotary percussion surfaces 52b, 54b engage with one another during a rotary percussion, thus braking striker 14b in the peripheral direction. During the rotary percussion operation, connecting means 48b move striker 14b against a percussion spring 50b of hand-held power tool device 10b in a direction facing away from rotary percussion receiver 16b. In the process, connecting means 48b extend into striker lift area 64b of curved tracks 46b. Striker 14b is rotatably supported during a rotary percussion operation. As soon as striker 14b and rotary percussion receiver 16b are disengaged, connecting means 48b accelerate striker 14b in the peripheral direction. The acceleration of striker 14b in the peripheral direction is a function of a slope of striker lift areas 64b. As soon as connecting means 48b enter into clearance areas 66b of curved tracks 46b, percussion spring 50b accelerates striker 14b axially in the direction of output unit 12b until rotary percussion surfaces 52b, 54b impact one another and rotary percussion receiver 16b transfers the rotary percussion pulse in the direction of output unit 12b. Rotary percussion surfaces 52b, 54b are oriented in such a way that the transfer of the rotary percussion pulse essentially stops the axial movement of striker 14b.

(22) Alternatively, the slope of a striker lift area could be designed in such a way that a rotational speed of a striker temporarily exceeds a rotational speed of a rotary drive shaft. The striker would then be guided in the striker lift areas by guide means during a movement in the direction of an output unit.

(23) In the hammer percussion operation, rotary percussion surfaces 52b of rotary percussion receiver 16b are situated outside a range of rotary percussion surfaces 54b of striker 14b. Striker catch device 20b secures striker 14b in an axially displaceable and rotationally fixed manner during the entire hammer percussion operation. Striker lift areas 64b of curved tracks 46b move striker 14b against percussion spring 50b via connecting means 48b. Percussion spring 50b moves striker 14b in the direction of output unit 12b as soon as connecting means 48b are situated in clearance areas 66b. A hammer percussion surface 56b of striker 14b transfers a hammer percussion pulse to a hammer percussion surface 58b of output unit 12b.