JP2005161517A - Electric machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a defect of conventional technique of an electric machine tool equipped with an electric motor arranged in a casing, an insert tool arranged in a tool holder through the electric motor in such a manner of capable of being driven so as to rotate at least, and a switch means for reversing the rotating direction of the insert tool. <P>SOLUTION: The switch device is provided with gear transmission devices 24, 26, 28, 32 and 40. When the rotating direction of the electric motor is invariable by the gear transmission devices 24, 26, 28, 32 and 40, the insert tool can be selectively driven to one or the other rotating direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is an electric machine tool, and is provided with an electric motor disposed in a casing, and an insertion tool disposed in a tool holder can be driven to rotate at least through the electric motor. It is related with the type of which the switching device for reversing the rotation direction of an insertion tool is provided.

  Both electric drills and hammer drills are generally configured clockwise. Thus, particularly in hammer drills, the counterclockwise function is limited to the removal of a screw or possibly a drill that has become stuck, for example on a concrete reinforcement. In this case, the counterclockwise rotation is performed by changing the rotation direction of the electric motor of the electric machine tool.

  The simplest possibility for turning direction is the reversal of the polarity of the motor current by means of an electrical reversing switch. A series motor usually used in an electric machine tool has a preferential rotation direction. This is because, in order to minimize electromagnetic loss, the armature winding is rotated at a predetermined angle with respect to the field winding, thereby reducing the magnetic field strength with low rectification. It can happen in the area. Therefore, in an immobile carbon brush, the optimal switching only works in one direction of rotation, so that the opposite direction of rotation, usually counterclockwise, is a pure motor current based on poor commutation. Polarity reversal leads to output loss. Another drawback is the spark obstruction problem due to higher thermal loads, strong wear of the carbon brushes and strong brush flames. Good air cooling is essential to reduce the heat load of the electric motor when the power consumption is high. However, a sufficiently high ventilation can only be formed by a blower whose blades have a suitably curved shape and thus have a preferential rotation direction based on the principle. Therefore, the rotational direction of the electric motor opposite to the preferential rotational direction is additionally thermally disadvantageous.

  Accordingly, an object of the present invention is an electric machine tool of the type described at the beginning, wherein an electric motor disposed in a casing is provided, and an insertion tool disposed in a tool holder via the electric motor. However, it is to improve the disadvantages of the prior art in a type that is at least capable of being driven to rotate and is provided with a switching device for reversing the direction of rotation of the insertion tool.

  According to the means of the present invention that solves this problem, the switching device has a gear transmission, and when the rotation direction of the electric motor is not changed by the gear transmission, the insertion tool is selectively connected to one side. Or it can be driven in the other direction of rotation. The reversal of the direction of rotation of the insertion tool can be performed by purely mechanical means.

  Electric motors and blowers can be optimized for operation with only one direction of rotation, which improves motor efficiency and cooling. This provides a higher motor rated output that can be used for both rotational directions of the insert. The stop time of the carbon brush of the electric motor is extended. A mechanical switching device for reversing the direction of rotation is robust and has a lower risk of failure than electrical switching of the direction of rotation of the electric motor. The invention is particularly preferably used in a power machine tool operated by hand, preferably in a L-shaped configuration. The L-shaped configuration means that the driven shaft of the electric motor is arranged perpendicular to the operating direction. Particularly advantageously, the present invention is used for an L-shaped hammer drill equipped with a striking mechanism drive device using a swing drive device and an L-shaped hammer drill equipped with a striking mechanism drive device using an eccentric device. be able to.

  If the switching device has at least a switching sleeve, which can be positioned in relation to the selected operating mode, the electric machine tool is connected via a single operating type selection button. Different driving modes can be adjusted by comfortable and easy operation. In the case of a particularly advantageous hammer drill, the four hammer operation types, counterclockwise, clockwise, hammer drill and chisel can be adjusted with only one operation type selection button. Thereby, erroneous operation, that is, counterclockwise hammer operation or chisel operation can be prevented in a simple manner. The switching sleeve can be slid in accordance with the adjustment of the operation type selection button, for example, by a switching rod.

  In an advantageous configuration, the switching device has a second switching sleeve. This switching sleeve can likewise be positioned in relation to the selected operating mode. The switching sleeve may be housed in the switching link in a rotatable manner. This switching link travels in the notch of the switching rod according to various positions of the operation type selection button, is finally entrained in the axial direction at the counterclockwise position, and causes a counterclockwise movement correspondingly. Then, the 1st switching sleeve which causes clockwise movement is located in the neutral position.

  Advantageously, the first switching sleeve and the second switching sleeve have operating means. In relation to the position of the switching sleeve, this operating means is operatively coupled to the driving means for one or the other rotational direction, or at least movable to a rotationally neutral position. This allows the switching sleeves to be moved to one defined position for each movement type, thereby enabling operation modes such as counterclockwise and clockwise as well as hammer drills and chisels. ing.

  When the switching device has a reversing bevel gear, and this reversing bevel gear can be driven by the bevel-shaped pinion together with the main bevel gear, the present invention is particularly simple in that the drive shaft of the striking mechanism and the electric drive This can be implemented in an electric machine tool having a substantially right angle with the motor shaft. In the conventional electric machine tool of this type, a staggered bevel gear device is generally used to change the rotational motion of the motor to the driving of the striking mechanism. According to the present invention, the turning device can be easily used in this type of electric machine tool. Can be incorporated into the machine.

  When the main bevel gear and the inverted bevel gear are arranged on opposite sides of the umbrella pinion, two drive means are provided that rotate in opposite directions for one or the other direction of rotation in a very simple manner. It is.

  Advantageously, the inverted bevel gear is rotatably arranged on the support sleeve. Thereby, the compact structure of a switching apparatus is obtained. Suitably, the main bevel gear is firmly connected to the support sleeve and the axial length of the support sleeve is provided as the sliding distance of the switching sleeve. This device is particularly suitable for an L-shaped hammer drill equipped with a striking mechanism drive device with a swing drive.

  In an alternative form of construction, a reversing bevel gear is arranged on the hammer tube. This device is particularly suitable for hammer drills of the L-shaped configuration with an impact drive device with an eccentric drive device.

  Advantageously, the reversing bevel gear is arranged in the hammer tube so as to be slidable in the longitudinal direction, so that it can engage and disengage from the umbrella pinion. In this configuration, the main bevel gear and the inverted bevel gear are simultaneously meshed with the umbrella pinion only when the operation mode is counterclockwise. This prevents friction loss of the bevel gear rotating in the opposite direction during the clockwise main driving mode.

  When the second switching sleeve can be connected to the inverted bevel gear, the first switching sleeve and the second switching sleeve can be moved in a consistent manner via a common switching rod. The second switching sleeve can remain in the neutral position when the first switching sleeve provides for connection of the main bevel gear to the hammer tube. In this case, the inverted bevel gear can remain at a position deviated from meshing with the umbrella pinion. At the corresponding position of the switching rod, the first switching sleeve can be positioned as follows: the main bevel gear does not have a drive function and the second switching sleeve is directly or indirectly In particular, the inverted bevel gear can be positioned so as to be connected to the hammer tube.

  When the inverted bevel gear has a groove in the axial hole and an annular spring preloaded in the radial direction is disposed in this groove, the inverted bevel gear is moved by the second switching sleeve. It can be connected to the hammer tube via an annular spring. A more reliable frictional connection that can be implemented by a reliable mechanism can be formed.

  When the first switching sleeve and the second switching sleeve are guided so as to rotate and move in the axial direction, the rotational movement in both rotational directions also advances the switching distance. Translational movements can also be performed. In an advantageous configuration, the first switching sleeve is guided in a support sleeve and a bearing, in particular a needle bearing, operating in a rocking drive. In this case, a single switching sleeve is sufficient to connect both the main bevel gear and the inverted bevel gear to the operating means.

  When an intermediate shaft is provided, and the intermediate shaft is supported by the gear transmission casing and the swing drive device so as to be movable in the axial direction, the intermediate shaft is operated via a bearing. Thus, it is possible to slide in the axial direction, whereby various desired operation modes can be adjusted. Instead of a rocking drive, the expert will consider another suitable drive for the striking mechanism that the expert deems meaningful.

  When a switching bearing is provided and the intermediate shaft is slidable in the axial direction by the selection means via this switching bearing, the intermediate shaft is slid in the axial direction by operation of the selection means, particularly by rotation. Can move.

  When a compression spring is provided and this compression spring connects the switching sleeve to the intermediate shaft, the axial connection of the compression spring causes the rotational connection between the switching sleeve and the intermediate shaft to be either the intermediate shaft or the switching shaft. It can be ensured that the sleeve is maintained at different axial positions.

  If a common selection means for the driving mode is provided for both directions of rotation, erroneous operation can be prevented. All operating modes of the electric machine tool can be adjusted with a central selection means, in particular with an operating type selection button.

  Further advantages of the invention are apparent from the description based on the following drawings. In the drawing, three embodiments of the present invention are shown. The drawings, the description and the claims have a number of features in combination. The expert will consider these features individually for each purpose and constitute another meaningful combination.

  FIG. 1 shows a hammer drill in the form of an advantageous hand-held machine tool. The hammer drill is provided with a casing 10, and an electric motor (not shown) is disposed in the casing 10. Via this electric motor, an insertion tool (not shown) arranged in the tool holder 12 can be driven to rotate at least about the axis 18. The electric machine tool can be held by a vertical handgrip 14 fixed to the housing, and can be switched on via a switching claw disposed on the handgrip 14. By means of the selection means 16, it is possible to switch between different operating modes of the electric machine tool. Advantageously, one rotatable operation type selection button 16 for all operation modes is the central selection means 16. A switching device is provided for reversing the rotational direction of the insertion tool. This switching device will be described in detail in the following drawings. In the drawings, equal or similar parts are denoted by basically the same reference numerals.

  The operation type selection button 16 is shown in detail in FIG. Due to the rotation, the switching positions 20 are successively different in operating modes A, B, C, D, for example, counterclockwise without strike (A), clockwise without strike (B), hammer drilling (C) and chisel ( D) can be adjusted. In this case, the pin 22 cooperates with the switching device inside the housing 10, for example via a rack, so that the direction of rotation of the insertion tool is reversed or different operating modes are possible. It is activated.

  3, 4, 5 and 6 show the first embodiment. FIG. 3 shows a longitudinal cross-sectional view of a part of the hammer drill according to FIG. 1, showing the construction of a mechanical switching device, in particular a counterclockwise function without hammer hammer strike. The bevel pinion 24 of the armature shaft of the electric motor meshes with the main bevel gear 26 and the inverted bevel gear 28 at the same time. The main bevel gear 26 and the inverted bevel gear 28 are arranged on opposite sides of the circumference of the umbrella pinion 24. The main bevel gear 26 is firmly compression-molded on the support sleeve 32. The support sleeve 32 itself is guided in the adjustment cover 38 via a support ball bearing 34.

  The reversing bevel gear 28 is positioned on the support sleeve 32 so as to rotate, so that in the rotational direction described above the conical pinion, the main bevel gear 26 is viewed from an operator located behind the hammer drill. The reversal bevel gear 28 rotates counterclockwise. The clockwise rotation corresponds to the normal main rotation direction of the hammer drill.

  In the operation mode described above, the inner tooth row 30 of the reversing bevel gear 28 meshes with the outer tooth row 44 of the switching sleeve 40, so that the switching sleeve 40 is also turned counterclockwise. The switching sleeve 40 is guided in the needle bearing 72 and the support sleeve 32 extending into the swing drive device 62 so as to rotate and move in the axial direction. The axial movement of the switching sleeve 40 can be substantially parallel to the axis 18 (FIG. 1). The swing drive device 62 is connected to a piston guided in the hammer pipe by a swing finger 64.

  The switching sleeve 40 has other outer teeth 42 and 46. These outer teeth 42 and 46 are used as operating means 42, 44 and 46 at different axial positions of the switching sleeve 40. These operating means 42, 44, 46 are associated with the driving means 26, 28, in particular with the main bevel gear 26 or the reversing bevel gear 28, for one or the other rotational direction, relative to the position of the switching sleeve 40. It is possible to transition to a coupling or to a rotational neutral position. In this rotational neutral position, only the striking mechanism is driven.

  The inner tooth row 36 of the support sleeve 32 can freely rotate next to the outer tooth row 42 when the switching sleeve 40 rotates at the illustrated axial position of the switching sleeve 40. From the inner tooth row 48 of the switching sleeve 40, the rotational moment supplied from the electric motor is transmitted to the intermediate shaft 50. The intermediate shaft 50 is supported in a gear transmission housing or oscillating drive 62, preferably needle bearings 66, 68, 70, 72, for axial movement. The intermediate shaft 50 is slid in a limited manner through the switching bearing 56 by the operation type selection button 16 in the axial direction, for example, by the action coupling with the pin 22 of the operation type selection button 16. Rotational motion is transmitted to the hammer tube and then to the insertion tool via the gear 52 of the intermediate shaft 50 and the spur gear 54 via the straight end meshing. When the outer teeth 74 of the intermediate shaft 50 are engaged with the inner teeth 48, rotational entrainment occurs between the switching sleeve 40 and the intermediate shaft 50. The rotational connection between the switching sleeve 40 and the intermediate shaft 50 is supported by a compression spring 60.

  The configuration of the operation mode “clockwise without hitting” is shown in FIG. The intermediate shaft 50 is slid leftward by the rotation of the operation format selection button 16. Based on the axial force of the compression spring 60, the switching sleeve 40 also moves with the intermediate shaft 50, so that the rotational connection between them is maintained. At the same time, the rotational entrainment of the switching sleeve 40 and the reversing bevel gear 28 is released from engagement, and the outer tooth row 44 of the switching sleeve 40 is disengaged from the inner tooth row 30 of the reversing bevel gear 28, and the outer tooth row 42 of the switching sleeve 40 is moved. By meshing with the inner teeth of the support sleeve 32, the rotational entrainment portion between the support sleeve 32 and the switching sleeve 40 shifts to meshing. In this case, the right rotating main bevel gear 26 is connected to the intermediate shaft 50 and thus to the insertion tool. The rotational entrainment between the switching sleeve 40 and the intermediate shaft 50 is still maintained by engaging the outer teeth 74 of the intermediate shaft 50 with the inner teeth 48 of the switching sleeve 40.

  FIG. 5 shows the configuration of the operation mode “hammer drilling”. By further rotation of the operation type selection button (FIG. 2) 16, the intermediate shaft 50 and the switching sleeve 40 are again slid leftward by one step. The rotation entrainment portion to the switching sleeve 40 via the main bevel gear 26 and the rotation entrainment portion to the intermediate shaft 50 are such that the inner tooth row 36 of the support sleeve 32 continues to mesh with the inner tooth row of the switching sleeve 40. Thus, the meshed state is still maintained. Additionally, the outer teeth 46 on the front side of the switching sleeve 40 mesh with the inner teeth 76 of the swing driving device 62, whereby the striking mechanism (not shown) in the hammer tube is moved to the swing driving device 62. Can be driven through. The outer tooth row 74 of the intermediate shaft 50 is still engaged with the inner tooth row 48 for rotational entrainment.

  The chisel position is shown in FIG. By rotating the drive type selection button 16 to the end position D (FIG. 2), the intermediate shaft 50 is slid to the left stopper provided on the fixed thin plate 80, where the intermediate shaft 50 is fixed to a chisel (not shown). Fixed non-rotatable to the device. Since the switching sleeve 40 in the swing drive device 62 abuts the bearing 78, it cannot participate in this further sliding. The rotational entrainment between the switching sleeve 40 and the intermediate shaft 50 is disengaged by the following: the outer tooth row 74 of the intermediate shaft 50 is disengaged from the inner tooth row 48 of the switching sleeve 40, thereby The meshing is released when only the swing driving device 62 is driven by the switching sleeve 40 due to the engagement between the outer tooth row 46 of the switching sleeve 40 and the tooth row 76 of the swing driving device 62.

  7, 8, 9 and 10 show a second embodiment of a hammer drill having an L-shaped configuration. This hammer drill includes a striking mechanism driving device using an eccentric device. The working direction is indicated by a broken line.

  FIG. 7 shows a longitudinal partial cross-sectional view of an advantageous hammer drill with an eccentric drive (not shown) according to a second embodiment of the invention. An eccentric drive (not shown) acts on the tool (not shown) from the right side in the drawing. This tool is arranged on the left side of the hammer tube 108 in the drawing. The arrangement shown corresponds to a clockwise drill / hammer drill operating mode.

  In this case, the main bevel gear 26 and the reversing bevel gear 28 are located in the hammer pipe 108 and constantly mesh with the conical pinion 24. The conical pinion 24 is disposed perpendicular to the hammer tube 108 and is driven by an electric motor (not shown). A main bevel gear 26 and an inverted bevel gear 28 are arranged on opposite sides of the conical pinion 24. Between the main bevel gear 26 and the inverted bevel gear 28, a ring 184 is disposed on the hammer pipe 108 for fixation.

  A first toothed sleeve 102 and a second toothed sleeve 160 are arranged along the hammer tube 108 on the side where the bevel gears 26 and 28 are not meshed with each other. A first toothed sleeve 102 is disposed on the side of the main bevel gear 26. The inner tooth row 104 of the toothed sleeve 102 engages the longitudinal groove 110 of the hammer tube 108. The first toothed sleeve 102 can be connected to the outer tooth row 112 of the main bevel gear 26 via the entraining tooth row (not visible) of the first switching sleeve 140 by the outer tooth row 106. Further, a stationary sliding bearing 120 having an outer tooth row 122 is connected along the hammer tube 108. The first switching sleeve 140 is annularly engaged with the gripper 118 of the switching rod 100 and is slidable in the axial direction by the switching rod 100. The switching rod 100 is connected to an operating means (not shown), for example, an operation type selection button 16 as shown in FIG. By operating the operating means, the switching rod 100 can slide in the axial direction along the hammer tube 108. In this case, the first switching sleeve 140 or, in some cases, the second switching sleeve 150 can be entrained in relation to the position.

  A second toothed sleeve 160 is connected to the inverted bevel gear 28 along the hammer tube 108. The inner tooth row 162 of the toothed sleeve 160 also engages the longitudinal groove 110 of the hammer tube 198. When the entraining tooth row 152 of the second switching sleeve 150 is engaged with the outer tooth row 114 of the inverted bevel gear 28 and the outer tooth row 164 of the second toothed sleeve 160 at the corresponding position, The second toothed sleeve 160 can be connected to the outer tooth row 114 of the inverted bevel gear 28 via the outer tooth row 164 and the entraining tooth row 152 of the second switching sleeve 150. The second toothed sleeve 160 is fixed to the hammer tube 108 in the axial direction by a fixing element 166 disposed in the groove of the hammer tube 108.

  The second switching sleeve 150 is engaged in the pocket 176 of the switching link 174 by an annular entrainment 154. The switching link 74 travels in the notch 116 of the switching rod 100 and is held by the casing portion 170 by the compression spring 172.

  The main bevel gear 26 is connected to the first toothed sleeve 102 by an outer tooth row 112 via an entraining tooth row of the switching sleeve 140 (not visible in the drawing). The inner tooth row 104 of the toothed three 102 is accommodated in the longitudinal groove 110 of the hammer tube 108, so that when the umbrella pinion 24 is counterclockwise, the hammer tube 108 rotates clockwise. The fortune is adjusted. The reverse bevel gear 28 rotates loosely in the hammer tube 108 in the opposite direction to the main bevel gear 26. This is because the entraining tooth row 152 of the second switching sleeve 150 engages only with the second sleeve 160 that rotates loosely.

  When the operating means, preferably the operation type selection button (FIG. 2) 16 is rotated in an adjacent stage, the switching rod 100 is slid axially along the hammer tube 108, as shown in FIG. Brought to the “Bario-Rock” position. Vario-lock means that the hammer tube 108 is rotatable but not driven, which is useful, for example, for manually adjusting the appropriate angular position for the chisel.

  For the functionality and description of the individual components, please refer to the description of FIG. Due to the sliding of the switching rod 100 in the axial direction, the first switching sleeve 140 is now completely engaged with the outer tooth row 106 of the first toothed sleeve 102 to the left as viewed in the drawing, and the outer side of the main bevel gear 26. It is out of engagement with the dentition. The second switching sleeve 150 is still connected only to the second toothed sleeve 160. Therefore, the main bevel gear 26 and the inverted bevel gear 28 can freely rotate without driving the hammer tube 108. The hammer tube 108 can rotate independently of the drive device. This mode of operation represents a transition between an operation type drill and a chisel.

  When the operating means, preferably the operation type selection button 16 (FIG. 2) is rotated to the next stage, the switching rod 100 is further slid to the left in the axial direction. This is illustrated in FIG. 9 which shows the operating mode of the device described previously, a chisel. For the functionality and description of the individual components, please refer to the description of FIG. When the switching rod 100 slides in the axial direction, the gripper 118 of the switching rod 100 entrains the first switching sleeve 140, and the inner tooth row of the switching sleeve 140 is the outer tooth row 106 of the first toothed sleeve 102. In addition, the switching sleeve 140 is positioned so as to engage with the outer tooth row 122 of the stationary sliding bearing 120. Thereby, the first toothed sleeve 102 is fixed, and the hammer tube 108 is also fixed via the inner tooth row 104 of the toothed sleeve 102. The main bevel gear 26 and the reverse bevel gear 28 can freely rotate.

  When the operating means, preferably the operation type selection button (FIG. 2) 16, is rotated to the next stage, the switching rod 100 is further slid to the left in the axial direction. This is illustrated in FIG. FIG. 10 shows a counterclockwise operation mode of the apparatus described above. For the functionality and description of the individual components, please refer to the description of FIG. The gripper 118 of the switching rod 100 slides the first switching sleeve 140 to the stationary sliding bearing 120, so that the first toothed sleeve 102 can freely rotate. At the same time, in this switching step, the second switching sleeve 150 is entrained by the switching rod 100 and moved to the left. This is because the switching link 174 is pressed in the movement direction of the switching rod 100 against the pressure of the compression spring 172 at the end portion of the notch 116 of the switching rod 100. The entraining tooth row 152 of the second switching sleeve 150 is slid into the outer tooth row 114 of the inverted bevel gear 28 and simultaneously meshes with the outer tooth row 164 of the second toothed sleeve 160. The reversing bevel gear 28 and the second toothed sleeve 160 are now connected, through which the hammer tube 108 is within the inner tooth row 162 that engages the longitudinal groove 110 of the toothed sleeve 160. Are also linked.

  FIGS. 11, 12, 13, 14 and 15 show a third embodiment of an advantageous hammer drill having a striking mechanism drive with eccentric drive. The components and the switching process are substantially the same as those shown in FIGS. For the functionality and description of the individual components, please refer to the description of the drawings.

  Contrary to the first and second embodiments, an advantageous device has a reversing bevel gear 28, which is connected to the beveled pinion 24 only in the operating mode, counterclockwise. .

  In the configuration shown in FIG. 11, the switching rod 100 is switched again in the same manner as in FIG. That is, the hammer drill is in the operation mode drill / hammer drill.

  The inverted bevel gear 28 is disposed on the hammer tube 108 so as to be slidable in the axial direction, and is engaged by the inner tooth row 30 in the longitudinal groove 110 of the hammer tube 108. In this case, the second toothed sleeve 160 for connecting the inverted bevel gear 28 to the hammer tube 108 via the toothed sleeve 160 shown in FIGS. 7 to 10 can be omitted.

  A groove 182 is located in the axial hole of the inverted bevel gear 28. An annular spring 156 that is preloaded in the radial direction is positioned in the groove 182. The annular spring 156 is located on the hammer tube 108. A lock pin 158 extends in the hole of the inverted bevel gear 28. The lock pin 158 contacts the annular spring 156 on the inner side and the conical inner surface of the second switching sleeve 150 on the outer side. The second switching sleeve 150 is accommodated in the switching link 174 so as to be rotatable again. The switching link 174 is held on the casing portion 170 by a compression spring 172. As described above, the switching link 174 travels in the notch 116 of the switching rod 100 at the switching position, hammer drill, bario lock and chisel, and is finally accompanied when switching counterclockwise.

  FIG. 12 shows a longitudinal section through an advantageous hammer drill in the operating mode, Vario Lock. This arrangement corresponds to the arrangement of FIG. For the functionality and description of the individual components, please refer to the description of the drawings. The switching rod 100 is further moved to the left in the axial direction, and is engaged with the outer tooth row of the first toothed sleeve 102 by the gripper 118. The inner tooth row of the toothed sleeve 102 is engaged with the longitudinal groove 110 of the hammer tube 108.

  FIG. 13 shows a longitudinal partial cross-sectional view of an advantageous hammer drill in the operating mode, chisel. This arrangement corresponds to the arrangement of the second embodiment shown in FIG. Refer to the drawings for the functionality and description of the individual components. The switching rod 100 is moved further leftward in the axial direction, and is engaged by the gripper 118 with the outer tooth row 106 of the first toothed sleeve 102 and the outer tooth row 122 of the stationary sliding bearing 120. ing.

  When the switching rod 100 is further slid to the left in the axial direction by operating the operation means, particularly the operation type selection button (FIG. 2) 16, the operation mode shown in FIG. Then, the inversion of the inverted bevel gear 28 into the tooth row of the umbrella pinion 24 is started. The reverse bevel gear 28 is slid in the axial direction through the switching rod 100, the switching link 174, and the second switching sleeve 150. In this case, the slope 180 of the second switching sleeve 150 is in contact with the lock pin 158. The lock pin 158 cannot escape radially inward at first. This is because the annular spring 156 is still located on the hammer tube 108. When the reversing bevel gear 28 is in the terminal position, further sliding of the second switching sleeve 150 causes the lock pin 158 to move inward until the annular spring 156 enters the annular groove 186 of the hammer tube 108. Pressed in the direction. The second switching sleeve 150 can move to the stopper 188 provided in the inverted bevel gear 28 by the radial entry of the lock pin 158. This is illustrated in FIG. 15 for the operating mode, counterclockwise. For the functionality of the individual components, please refer to the description of the drawings.

  The inner tooth row 30 of the inverted bevel gear 28 is in contact with the annular spring 156, whereby the inverted bevel gear 28 is fixed in the axial direction by the hammer tube 108.

1 is a perspective view of an advantageous hammer drill. FIG.

It is a figure which shows the operation type selection button of an advantageous hammer drill.

1 is a longitudinal partial cross-sectional view of an advantageous counterclockwise hammer drill without hitting according to a first embodiment; FIG.

1 is a longitudinal partial cross-sectional view of an advantageous clockwise hammer without hitting. FIG.

1 is a longitudinal cross-sectional view of an advantageous hammer drill in an operation mode hammer drill. FIG.

1 is a longitudinal partial cross-sectional view of an advantageous hammer drill in an operating mode chisel.

FIG. 3 is a longitudinal partial cross-sectional view of an advantageous hammer drill according to a second embodiment in an operation mode drill / hammer drill.

1 is a longitudinal partial cross-sectional view of an advantageous hammer drill in an operating mode barrio lock; FIG.

1 is a longitudinal partial cross-sectional view of an advantageous hammer drill in an operating mode chisel.

Figure 2 is a longitudinal partial cross-sectional view of an advantageous hammer drill in a counterclockwise operating mode.

FIG. 4 is a longitudinal partial cross-sectional view of an advantageous hammer drill according to a third embodiment in an operation mode drill / hammer drill;

FIG. 2 is a longitudinal partial cross-sectional view of an advantageous hammer drill in the operating mode, Vario Lock.

1 is a longitudinal partial cross-sectional view of an advantageous hammer drill in an operating mode chisel.

It is a longitudinal cross-sectional view of the hammer drill in the engagement stage for the operation mode counterclockwise.

Figure 2 is a longitudinal partial cross-sectional view of an advantageous hammer drill in a counterclockwise operating mode.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Casing, 12 Tool holder, 14 Hand grip, 16 Operation type selection button, 18 Axis, 20 Switching position, 22 Pin, 24 Umbrella pinion, 26 Main bevel gear, 28 Inverted bevel gear, 30 Inner tooth row, 32 Support sleeve , 34 Support Tama bearing, 36 Inner dentition, 38 Adjustment cover, 40 Switching sleeve, 42 Outer dentition, 44 Outer dentition, 46 Outer dentition, 48 Inner dentition, 50 Intermediate shaft, 52 Gear, 54 Spur gear, 56 switching bearings, 60 compression springs, 62 rocking drive devices, 64 rocking fingers, 66 bearings, 68 bearings, 70 bearings, 72 needle bearings, 74 outer tooth rows, 76 tooth rows, 78 bearings, 80 fixed thin plates, 100 switching Rod, 102 Toothed sleeve, in 104 Dentition, 106 outer dentition, 108 hammer tube, 110 longitudinal groove, 112 outer dentition, 114 outer dentition, 116 notch, 118 gripper, 120 sliding bearing, 122 outer dentition, 140 switching sleeve, 150 switching sleeve 152 entrainment tooth row, 154 entrainment portion, 156 annular spring, 158 lock pin, 160 toothed sleeve, 162 inner tooth row, 164 outer tooth row, 166 fixed element, 170 element, 172 spring, 174 switching link, 176 pocket, 178 Slope, 182 groove, 184 ring, 186 ring groove, 188 stopper

Claims (16)

  An electric machine tool is provided with an electric motor arranged in the casing (10), and the insertion tool arranged in the tool holder (12) is at least rotated via the electric motor. In the type that is capable of being driven and provided with a switching device for reversing the rotational direction of the insertion tool, the switching device is a gear transmission (24, 26, 28, 32, 40, 140, 150), and the gear transmission (24, 26, 28, 32, 40, 140, 150) can selectively insert one or the other when the rotational direction of the electric motor is unchanged. An electric machine tool characterized in that it can be driven in the direction of rotation.   2. The switching device according to claim 1, wherein the switching device comprises at least a first switching sleeve (40, 140), the switching sleeve (40, 140) being positionable in relation to the selected operating mode. Electric machine tool.   The electric machine tool according to claim 2, wherein a second switching sleeve (150) is provided.   The first and second switching sleeves (40, 140, 150) have operating means (42, 44, 152), and the operating means (42, 44, 152) are switching sleeves (40, 140). , 150) in relation to the position of the drive means (26, 28) for one or the other direction of rotation or can be transferred to a rotational neutral position. The electric machine tool according to claim 2 or 3.   The switching device comprises a reversing bevel gear (28), which can be driven by a beveled pinion (24) together with a main bevel gear (26). The electric machine tool according to any one of 4 to 4.   The electric machine tool according to claim 5, wherein the main bevel gear (26) and the inverted bevel gear (28) are arranged on opposite sides of the umbrella pinion (24).   The electric machine tool according to claim 5 or 6, wherein the inverted bevel gear (28) is arranged on the support sleeve (32) so as to rotate.   The electric machine tool according to claim 5 or 6, wherein the inverted bevel gear (28) is arranged on the hammer pipe (108).   The inverted bevel gear (28) is arranged as follows to slide longitudinally, i.e. can be engaged with the umbrella pinion (24) or can be disengaged. The electric machine tool according to claim 8.   The electric machine tool according to claim 8 or 9, wherein the second switching sleeve (150) is connectable to the inverted bevel gear (28).   The inverted bevel gear (28) has a groove (182) in an axial hole, and an annular spring (156) preloaded in the radial direction is disposed in the groove (182). Item 11. The electric machine tool according to any one of Items 8 to 10.   12. The electric machine according to claim 1, wherein the first and second switching sleeves (40, 140, 150) are guided to rotate and to move axially. machine.   13. An intermediate shaft (50) is provided, the intermediate shaft (50) being supported in a gear transmission casing and a rocking drive (62) for axial movement. The electric machine tool according to any one of the above.   14. A switching bearing (56) is provided, the intermediate shaft (50) being slidable in the axial direction by the selection means (16) via the switching bearing (56). Electric machine tool.   The electric machine tool according to claim 13, wherein a compression spring (60) is provided, the compression spring (60) connecting the first switching sleeve (40) to the intermediate shaft (50).   Electric machine tool according to any one of the preceding claims, wherein a common selection means (16) for the type of operation is provided for both directions of rotation.

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