JP2013091117A - Striking tool - Google Patents

Striking tool Download PDF

Info

Publication number
JP2013091117A
JP2013091117A JP2011233126A JP2011233126A JP2013091117A JP 2013091117 A JP2013091117 A JP 2013091117A JP 2011233126 A JP2011233126 A JP 2011233126A JP 2011233126 A JP2011233126 A JP 2011233126A JP 2013091117 A JP2013091117 A JP 2013091117A
Authority
JP
Japan
Prior art keywords
tool
motor
holder
drive motor
torque
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2011233126A
Other languages
Japanese (ja)
Inventor
Masanori Furusawa
正規 古澤
Yoshio Sugiyama
義夫 杉山
Original Assignee
Makita Corp
株式会社マキタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Makita Corp, 株式会社マキタ filed Critical Makita Corp
Priority to JP2011233126A priority Critical patent/JP2013091117A/en
Publication of JP2013091117A publication Critical patent/JP2013091117A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D11/00Portable percussive tools with electromotor or other motor drive
    • B25D11/06Means for driving the impulse member
    • B25D11/12Means for driving the impulse member comprising a crank mechanism
    • B25D11/125Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D16/00Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2211/00Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003Crossed drill and motor spindles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/051Couplings, e.g. special connections between components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/245Spatial arrangement of components of the tool relative to each other

Abstract

Provided is a technique capable of suppressing an increase in the size of an impact tool while maintaining a high output torque.
A hammer drill for driving a hammer bit 119 that is detachably held is configured. The hammer drill 100 is driven by an outer rotor type drive motor 110 having a motor shaft 111, a transmission for changing the output rotation speed of the drive motor 110, and the drive motor 110, and reciprocally moves the hammer bit 119 in a predetermined direction. A striking element 140. And it is the structure which drives the hammer bit 119 via the rotational output of the drive motor 110 shifted by the transmission. As a result, the output of the drive motor 110 can be increased as compared to an inner rotor type drive motor of an equivalent size, and therefore the size of the hammer drill 100 that requires a large output can be suppressed.
[Selection] Figure 1

Description

  The present invention relates to an impact tool having an outer rotor type motor.
  Japanese Patent Application Laid-Open No. 2006-181646 describes an electric hammer drill having a clutch mechanism for power interruption. This electric hammer drill uses an inner rotor type motor, and the tip tool is driven by the driving of the motor.
JP 2006-181646 A
  In general, since the impact tool needs to process a workpiece with a large force, it is preferable that the output torque of the motor is high. However, in order to obtain a high torque using the inner rotor type motor, it is necessary to use a large motor. When the motor becomes larger, the impact tool itself becomes larger. Then, an object of this invention is to provide the technique which can suppress the enlargement of an impact tool, maintaining a high output torque in view of the above.
  In order to solve the above-described problem, according to a preferred embodiment of the work tool according to the present invention, an impact tool that drives a tip tool that is detachably held is configured. The impact tool includes an outer rotor type motor having a drive shaft, a transmission that changes the output rotational speed of the motor, and an impact mechanism that is driven by the motor and linearly reciprocates the tip tool in a predetermined direction. Yes. And a tip tool is driven via the rotation output of the motor speed-changed by the transmission.
  According to the present invention, by using the outer rotor type motor, it is possible to increase the output torque of the motor as compared with the case of using an inner rotor type motor having an equivalent size. As a result, the hitting ability can be increased without increasing the hitting tool.
  According to the further form of the working tool which concerns on this invention, a transmission has a drive belt which transmits the rotational output of a motor.
  According to the present embodiment, by using the drive belt, it is possible to reduce the sound generated when the rotational output is transmitted, compared to the case where the rotational output of the motor is transmitted between the gears.
  According to the further form of the working tool which concerns on this invention, a striking mechanism is a structure driven via a drive belt.
  According to this embodiment, the rotational output of the motor transmitted to the striking mechanism is shifted via the drive belt, so that the rotational output is more effectively transmitted to the striking tool that needs to generate a large torque. The sound generated at the time can be reduced.
  According to the further form of the work tool which concerns on this invention, the 1st gear which can rotate integrally with a drive shaft, the holder which hold | maintains a tip tool so that rotation driving is possible, The 2nd gear which rotates integrally with a holder, have. The first gear and the second gear mesh with each other and rotate, and the drive shaft is directly connected to the holder for driving to rotate the holder.
  According to this embodiment, since the rotation output of the motor is directly connected to the drive and transmitted to the holder, an intermediate transmission element that reduces the rotation speed and transmits the rotation to the holder becomes unnecessary. Therefore, the impact tool can be reduced in size.
  According to the further form of the working tool which concerns on this invention, it has the torque limiter provided between the drive shaft and the 1st gear. The torque limiter disables the integral rotation of the drive shaft and the first gear when a torque greater than a predetermined torque is applied.
  According to this embodiment, by having the torque limiter, even when the tip tool bites into the work piece and becomes unable to rotate, the rotation output of the motor is restricted from being transmitted to the holder. This can suppress the seizure of the motor.
  According to the further form of the working tool which concerns on this invention, the drive belt is comprised so that it may rotate integrally with a drive shaft. The torque limiter is provided between the drive belt and the first gear, and the drive shaft and the first gear are in a state where the drive shaft and the drive belt rotate integrally when a torque greater than a predetermined torque is applied. The integral rotation of is disabled.
  According to this embodiment, when a torque greater than a predetermined torque is applied, the torque limiter disables the integral rotation of the drive shaft and the first gear in a state where the drive shaft and the drive belt rotate integrally. With respect to the drive belt that rotates integrally with the motor, it is possible to reduce the load when the torque limiter is operated.
  According to the further form of the working tool which concerns on this invention, it arrange | positions so that the major axis direction of a drive shaft and a holder may cross | intersect.
  According to this form, each element which comprises an impact tool can be efficiently arrange | positioned because the drive shaft and the major axis direction of a holder cross | intersect. Thereby, the enlargement of an impact tool can be suppressed.
  According to the further form of the working tool which concerns on this invention, the long axis direction of a drive shaft and a holder cross | intersects, and a front-end tool, a striking mechanism, and a motor are arrange | positioned coaxially.
  According to this embodiment, since the tip tool, the striking mechanism, and the motor are coaxially arranged, the striking tool can be prevented from being enlarged in the direction in which the drive shaft extends.
  ADVANTAGE OF THE INVENTION According to this invention, the technique which can suppress the enlargement of an impact tool can be provided, maintaining a high output torque.
It is a sectional side view which shows the whole structure of the hammer drill which concerns on embodiment of this invention. It is the elements on larger scale of FIG. It is a sectional side view which shows the whole structure of the hammer drill which concerns on the modification of this invention. FIG. 4 is a partially enlarged view of FIG. 3.
  Embodiments of the present invention will be described in detail with reference to the drawings. This embodiment is an example in which the present invention is applied to a hammer drill as an impact tool. As shown in FIG. 1, the hammer drill 100 according to the present embodiment is configured mainly by a main body 101 as a tool main body that forms an outline of the hammer drill 100 when viewed generally. A hammer bit 119 is detachably attached to the distal end region (left side in FIG. 1) of the main body 101 via a cylindrical tool holder 159. The hammer bit 119 is mounted so as to be movable relative to the tool holder 159 in the axial direction and integrally rotate in the circumferential direction. A hand grip 107 gripped by the operator is connected to the opposite side of the tip region of the main body 101. The hammer bit 119 is an implementation configuration example corresponding to the “tip tool” in the present invention. For convenience of explanation, the hammer bit 119 side of the hammer drill 100 is referred to as the front, and the hand grip side is referred to as the rear.
  The main body 101 includes a motor housing 103 that houses the drive motor 110, and a gear housing 105 that houses the motion conversion mechanism 120, the striking element 140, and the power transmission mechanism 150.
  The drive motor 110 is mainly composed of a motor shaft 111, a rotor 112, and a stator 113. The rotor 112 is disposed outside the stator 113. The drive motor 110 configured in this manner is a so-called outer rotor type motor in which the motor shaft 111 and the rotor 112 rotate integrally. The drive motor 110 corresponds to the “motor” in the present invention, and the motor shaft 111 is an implementation configuration example corresponding to the “drive shaft” in the present invention.
  The drive motor 110 has a rotation axis (rotation axis of the motor shaft 111) in a vertical direction (vertical direction in FIG. 1) substantially orthogonal to the long axis direction of the main body 101 (long axis direction of the hammer bit 119). Has been placed. The torque of the drive motor 110 is appropriately converted into a linear motion by the motion conversion mechanism 120 and then transmitted to the striking element 140, and an impact force in the major axis direction of the hammer bit 119 is generated via the striking element 140.
  The torque of the drive motor 110 is transmitted to the hammer bit 119 via the power transmission mechanism 150 and the tool holder 159, and the hammer bit 119 is rotated in the circumferential direction. The drive motor 110 is energized and driven by pulling a trigger 107 a disposed on the handgrip 107.
  As shown in FIG. 2, the motion conversion mechanism 120 is mainly configured by a driving pulley 121, a belt 122, a driven pulley 123, and a crank mechanism. The drive pulley 121 is connected to the motor shaft 111 of the drive motor 110 and rotates integrally with the motor shaft 111. The belt 122 is formed of an elastomer such as rubber and rotates integrally with the driving pulley 121. The belt 122 connects the driving pulley 121 and the driven pulley 123. Thereby, the rotation output of the motor shaft 111 is transmitted to the driven pulley 123 via the driving pulley 121 and the belt 122. This belt 122 is an implementation configuration example corresponding to the “drive belt” in the present invention. In addition, the configuration in which the driving pulley 121, the belt 122, and the driven pulley 123 are combined is an implementation configuration example corresponding to the “transmission device” in the present invention.
  The crank mechanism includes a crankshaft 125 that rotates integrally with the driven pulley 123, an eccentric shaft 127 provided at a position shifted from the axis of the crankshaft 125, a piston 131, and a connecting rod 129 that connects the piston 131 and the eccentric shaft 127. Etc. The crankshaft 125 is rotatably supported by the gear housing 105 via a bearing. The piston 131 is provided as a driver for driving the striking element, and can slide in the cylinder 141 in the same direction as the long axis direction of the hammer bit 119. The motor shaft 111 and the crankshaft 125 of the drive motor 110 are arranged in parallel and side by side. Further, the drive motor 110 and the cylinder 141 are arranged so that the long axes are orthogonal to each other. The cylinder 141 is fixedly supported by the gear housing 105.
  The striking element 140 is striker 143 as a striker slidably disposed in the cylinder 141 and slidably disposed in the tool holder 159, and transmits the kinetic energy of the striker 143 to the hammer bit 119. It is mainly composed of an impact bolt 145 as a meson. The cylinder 141 is disposed behind the tool holder 159 and forms an air chamber 141 a partitioned by the piston 131 and the striker 143. The striker 143 is driven via a pressure fluctuation (air spring) of the air chamber 141 a accompanying the sliding motion of the piston 131, collides (hits) with the impact bolt 145, and strikes the hammer bit 119 via the impact bolt 145. Transmit power. This striking element 140 is an implementation configuration example corresponding to the “striking mechanism” in the present invention.
  The power transmission mechanism 150 is mainly composed of a small bevel gear 155, a large bevel gear 157, a tool holder 159, and a mechanical torque limiter 167, and transmits the torque of the drive motor 110 to the hammer bit 119. The tool holder 159 is a substantially cylindrical tubular member, and is held by the gear housing 105 so as to be rotatable around the long axis of the hammer bit 119. The small bevel gear 155 is disposed in the tip region of the motor shaft 111 of the drive motor 110 and is configured to be rotatable integrally with the motor shaft 111. The large bevel gear 157 is configured to mesh with and engage with the small bevel gear 155 and rotate integrally with the tool holder 159. The number of gear teeth of the large bevel gear 157 is larger than the number of gear teeth of the small bevel gear 155, and the output rotational speed of the drive motor 110 is reduced by the meshing of the large bevel gear 157 and the small bevel gear 155. Yes. The small bevel gear 155, the large bevel gear 157, and the tool holder 159 correspond to the “first gear”, “second gear”, and “holder” in the present invention, respectively, and the small bevel gear 155 and the large bevel gear 157 mesh with each other. This is an implementation configuration example corresponding to the “transmission device” in the present invention.
  The mechanical torque limiter 167 is provided as a safety device against overload applied to the hammer bit 119. When an excessive torque exceeding a design value (hereinafter also referred to as a maximum transmission torque value) acts on the hammer bit 119, the hammer bit 119 is provided. The torque transmission to the is cut off.
  The mechanical torque limiter 167 is provided between the small bevel gear 155 and the driving pulley 121 on the same axis as the motor shaft 111 and engages with the driving pulley 121 to rotate integrally therewith. A spring 169 provided between the driving pulley 121 and the driven member 168 is mainly used. If the torque value acting on the motor shaft 111 (corresponding to the torque value acting on the hammer bit 119) is less than or equal to the maximum transmission torque value determined in advance by the biasing force of the spring 169, the distance between the driving pulley 121 and the driven member 168 Torque is transmitted with. Thereby, the small bevel gear 155 rotates integrally with the motor shaft 111. That is, the driving pulley 121, the belt 122, and the small bevel gear 155 rotate integrally with the motor shaft 111.
  On the other hand, when the torque value acting on the motor shaft 111 exceeds the maximum transmission torque value, the torque transmission between the driving pulley 121 and the driven member 169 is cut off. As a result, the small bevel gear 155 cannot rotate integrally with the motor shaft 111. That is, the driving pulley 121 and the belt 122 rotate integrally with the motor shaft 111, and the small bevel gear 155 cannot rotate integrally with the motor shaft 111. This mechanical torque limiter 167 is an implementation configuration example corresponding to the “torque limiter” in the present invention.
  In the power transmission mechanism 150, the rotational output of the drive motor 110 is transmitted from the small bevel gear 155 formed on the motor shaft 111 to the large bevel gear 155 engaged with the small bevel gear 155, and the final output coupled to the large bevel gear 157. It is configured to be transmitted to the hammer bit 119 via a tool holder 159 as a shaft.
  The hammer drill 100 configured as described above is driven by energizing the drive motor 110 when the trigger 107a is operated. The rotation output of the drive motor 110 is transmitted to the motion conversion mechanism 120, and the piston 131 is slid linearly along the cylinder 141. Thereby, the striker 143 moves linearly in the cylinder 141 by the pressure change of the air in the air chamber 141a, that is, the action of the air spring. The striker 143 collides with the impact bolt 145 to transmit the kinetic energy to the hammer bit 119.
  On the other hand, the rotational output of the drive motor 110 is transmitted to the power transmission mechanism 150. Thereby, the tool holder 159 is rotationally driven, and the hammer bit 119 is rotated together with the tool holder 159. In this way, the hammer bit 119 performs the hammer operation in the axial direction and the drill operation in the circumferential direction, and performs the hammer drill operation on the workpiece.
  The hammer drill 100 according to the present embodiment is not limited to the working mode in the hammer drill mode in which the hammer bit 119 performs the hammer operation and the drill operation, and the drill mode in which the hammer bit 119 performs only the drill operation. It is possible to switch to a work mode or a work mode in a hammer mode in which the hammer bit 119 performs only a hammer operation. The description of the mode switching mechanism is omitted for convenience.
  The hammer drill 100 described above is configured such that, in the work mode in which the drill work is performed, the mechanical torque limiter 167 blocks the transmission of the rotation output when the hammer bit 119 is engaged with the workpiece and becomes unrotatable. ing. At this time, the mechanical torque limiter 167 disables the integral rotation of the motor shaft 111 and the small bevel gear 155 in a state where the motor shaft 111, the driving pulley 121, and the belt 122 are rotating together.
  According to the above-described embodiment, by using the outer rotor type drive motor 110, it is possible to increase the output torque of the drive motor 110 as compared with an inner rotor type drive motor having a comparable size. The configuration that increases the output torque of the drive motor 110 is particularly useful in a hammer drill that is a striking tool. Furthermore, since the output torque of the drive motor 110 can be increased as compared with an inner rotor type drive motor having an equivalent size, the hammer drill 100 can be improved in impact without increasing the size of the hammer drill 100. Further, by using the outer rotor type drive motor 110, it is possible to reduce the size of the drive motor 110 compared to the inner rotor type drive motor. That is, the hammer drill 110 can be downsized.
  Further, according to the present embodiment, since the output of the drive motor 110 is transmitted via the belt 122 made of an elastomer such as rubber, compared with the case where the output of the drive motor 110 is transmitted by meshing gears. Sound generated when transmitting the output can be reduced.
  Further, according to the present embodiment, when the hammer bit 119 bites into the workpiece and becomes unable to rotate, the mechanical torque limiter 167 interrupts torque transmission, so that the drive motor 110 continues to rotate. Can be prevented from being seized.
  Further, according to the present embodiment, the mechanical torque limiter 167 disables the integral rotation of the motor shaft 111 and the small bevel gear 155 while the motor shaft 111 and the belt 122 are rotating together. Therefore, when the hammer bit 119 is engaged with the workpiece and cannot rotate, the mechanical torque limiter 167 interrupts torque transmission, and the motor shaft 111 and the driving pulley 121 continue to rotate, but the small bevel gear 155 stops rotating. On the other hand, even if the hammer bit 119 bites into the workpiece and becomes unrotatable, the driving pulley 121 and the driven pulley 123 are the same as before the hammer bit 119 bites into the workpiece. Since it continues to rotate at the speed ratio, it is possible to suppress an unnecessary and unintended load from acting on the belt 122.
  In addition, the mechanical torque limiter 167 is arranged on the motor shaft 111 to suppress unnecessary and unintended load from acting on the belt 122. That is, when the mechanical torque limiter 167 is provided on the driven member side driven from the motor shaft 111 via the belt 122, the driven pulley 123 is used when the mechanical torque limiter 167 interrupts torque transmission. Unnecessary and undesired torque acts, and the speed ratio between the driving pulley 121 and the driven pulley 123 changes compared to before the hammer bit 119 bites into the workpiece. As a result, an unnecessary and urgent load acts on the belt 122. However, in this embodiment, since the mechanical torque limiter 167 is disposed on the motor shaft 111, the driving pulley 121 and the driven pulley 123 are each before the hammer bit 119 bites into the workpiece. Since it continues to rotate at the same speed ratio, it is possible to suppress an unnecessary and abrupt load from acting on the belt 122.
  Furthermore, the drive motor 110 can be disposed on the front side of the hammer drill 100 by directly connecting the motor shaft 111 to the tool holder 159 for driving. Thereby, the gravity center of the hammer drill 100 when processing the workpiece can be brought close to the workpiece, and the user can stably process the workpiece.
  In the present embodiment described above, the motor shaft 111 of the drive motor 110 and the small bevel gear 155 rotate integrally on the same axis, and the crankshaft 125 of the motion conversion mechanism 120 is provided separately from the motor shaft 111. Is not limited. For example, the motor shaft 111 and the crankshaft 125 may be integrally rotated coaxially, and the small bevel gear 155 may be configured to rotate integrally with an intermediate shaft provided separately from the motor shaft 111. In this case, the output of the motor shaft 111 is transmitted to the intermediate shaft via the belt 122, and the small bevel gear 155 is rotated.
  In the above-described embodiment, the mechanical torque limiter 167 is provided coaxially with the motor shaft 111 between the small bevel gear 155 and the driving pulley 121, but is not limited thereto. For example, the mechanical torque limiter 167 may be provided on the side opposite to the small bevel gear 155 of the driving pulley 121. In addition, as long as it is between the motor shaft 111 and the tool holder 159, the mechanical torque limiter 167 may be provided on the above-described intermediate shaft that is separate from the motor shaft 111. It may be provided between the bell gears 157.
  Next, modified examples in which various changes are made to the present embodiment will be described. However, the same reference numerals are given to those having the same configuration as the present embodiment, and the description thereof is omitted as appropriate.
  As shown in FIGS. 3 and 4, the modification is an example in which the present invention is applied to an electric hammer as an impact tool. The electric hammer 200 is different from the above embodiment in that the power transmission mechanism 150 is not provided. That is, the electric hammer 200 is mainly configured by the drive motor 110, the motion conversion mechanism 120, and the striking element 140, and is configured to perform only the hammer operation and not the drill operation. The rotation output of the outer rotor type drive motor 110 is transmitted to the striking element 140 through the motion conversion mechanism 120, so that the drive motor 110 drives the hammer bit 119 to perform a hammer operation. Therefore, the drive motor 110 is connected only to the motion conversion mechanism 120. That is, the belt 122 is attached to the motor shaft 111, and the rotation output of the motor shaft 111 is transmitted to the driven pulley 123 of the motion conversion mechanism 120.
  The motor shaft 111 of the drive motor 110 and the crankshaft 125 of the motion conversion mechanism 120 are arranged in parallel and side by side. Further, the connecting rod 129 of the motion conversion mechanism 120 intersects with the crankshaft 125 and is arranged on the long axis direction of the hammer bit 119 (long axis direction of the tool holder 159). Further, the striker 143 and the impact bolt 145 of the striking element 140 are also arranged on the longitudinal axis of the hammer bit 119. Thereby, the long axis direction of the motor shaft 111 and the tool holder 159 intersects, and the hammer bit 119, the striking element 140, and the drive motor 110 are arranged coaxially. The hand grip 107 is also arranged on the same axis.
  According to the configuration of the above modification, the output of the drive motor 110 can be increased by using the outer rotor type drive motor 110 as compared with an inner rotor type drive motor of the same size. The configuration that increases the output of the drive motor 110 is particularly useful in an electric hammer that is a striking tool. Furthermore, since the output of the drive motor 110 can be increased as compared with an inner rotor type drive motor having an equivalent size, the impact capability of the electric drill 200 can be increased without increasing the size of the electric hammer 200. Further, by using the outer rotor type drive motor 110, the drive motor 110 can be reduced in size. That is, the electric hammer 200 can be downsized.
  Further, according to the modification, since the output of the drive motor 110 is transmitted via the belt 122 made of an elastomer such as rubber, the output is compared with the case where the output of the drive motor 110 is transmitted by meshing the gears. It is possible to reduce the sound generated when transmitting.
  According to the modification, the motor shaft 111 and the tool holder 159 intersect with each other in the major axis direction, and the hammer bit 119, the striking element 140, and the drive motor 110 are arranged on the same axis. It can suppress that the electric hammer 200 enlarges in the direction to do. Furthermore, since the hammer bit 119, the striking element 140, and the drive motor 110 are coaxially arranged, the center of gravity of the electric hammer 200 can be set near the major axis of the hammer bit 119. As a result, when the workpiece is processed, the force applied to the handgrip 107 arranged on the same axis by the user can be prevented from being converted into a moment, and the user can efficiently transmit the force to the hammer bit 119. it can.
  In the above description, the belt 122 is formed of an elastomer such as rubber. However, the belt 122 is not limited to this and may be made of leather, cloth, or a composite material made of elastomer and fibers.
  In the above description, the configuration in which the long axis direction of the motor shaft 111 and the tool holder 159 intersect is described. However, the configuration is not limited thereto, and the motor shaft 111 and the tool holder 159 may be arranged in parallel.
100 Hammer drill (blow tool)
101 Body 107 Handgrip 110 Drive motor (motor)
111 Motor shaft (drive shaft)
112 rotor 113 stator 119 hammer bit (tip tool)
120 Motion Conversion Mechanism 121 Driving Pulley 122 Belt (Drive Belt)
123 Driven pulley 125 Crankshaft 127 Eccentric shaft 129 Connecting rod 131 Piston 140 Stroke element (striking mechanism)
141 Cylinder 141a Air chamber 143 Strike 145 Impact bolt 150 Power transmission mechanism 155 Small bevel gear (first gear)
157 Large bevel gear (second gear)
159 Tool holder 167 Mechanical torque limiter (torque limiter)
168 Driven member 169 Spring 200 Electric hammer (blow tool)

Claims (8)

  1. An impact tool for driving a tip tool that is detachably held,
    An outer rotor type motor with a drive shaft;
    A transmission for changing the output rotation speed of the motor;
    A striking mechanism that is driven by the motor and linearly reciprocates the tip tool in a predetermined direction;
    A striking tool for driving the tip tool through a rotational output of the motor shifted by the transmission.
  2. The impact tool according to claim 1,
    The said transmission apparatus has a drive belt which transmits the rotational output of the said motor, The impact tool characterized by the above-mentioned.
  3. The impact tool according to claim 2,
    The striking tool, wherein the striking mechanism is driven through the drive belt.
  4. It is an impact tool given in any 1 paragraph of Claims 1-3,
    A first gear rotatable integrally with the drive shaft;
    A holder for rotatably holding the tip tool;
    A second gear that rotates integrally with the holder,
    The first gear and the second gear mesh with each other and rotate;
    The impact tool according to claim 1, wherein the drive shaft is directly connected to the holder for driving to rotate the holder.
  5. The impact tool according to claim 4,
    A torque limiter provided between the drive shaft and the holder;
    The impact tool, wherein the torque limiter restricts transmission of the rotational output of the motor to the holder when a torque greater than a predetermined torque is applied.
  6. The impact tool according to claim 5,
    The drive belt is configured to rotate integrally with the drive shaft,
    The torque limiter is provided between the drive belt and the first gear, and the drive shaft and the drive belt rotate together when the torque greater than the predetermined torque is applied. A striking tool that makes integral rotation with the first gear impossible.
  7. The impact tool according to any one of claims 4 to 6,
    An impact tool, wherein the drive shaft and the holder are arranged so that the major axis direction of the holder intersects.
  8. It is an impact tool given in any 1 paragraph of Claims 1-3,
    The drive shaft and the major axis direction of the holder intersect,
    The impact tool, wherein the tip tool, the impact mechanism, and the motor are arranged coaxially.
JP2011233126A 2011-10-24 2011-10-24 Striking tool Pending JP2013091117A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011233126A JP2013091117A (en) 2011-10-24 2011-10-24 Striking tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011233126A JP2013091117A (en) 2011-10-24 2011-10-24 Striking tool
PCT/JP2012/076787 WO2013061835A1 (en) 2011-10-24 2012-10-17 Striking tool

Publications (1)

Publication Number Publication Date
JP2013091117A true JP2013091117A (en) 2013-05-16

Family

ID=48167668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011233126A Pending JP2013091117A (en) 2011-10-24 2011-10-24 Striking tool

Country Status (2)

Country Link
JP (1) JP2013091117A (en)
WO (1) WO2013061835A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6258093B2 (en) * 2014-03-24 2018-01-10 株式会社マキタ Impact tool

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63120053A (en) * 1986-11-05 1988-05-24 Shibaura Eng Works Co Ltd Power tool
JP2005305647A (en) * 2004-04-24 2005-11-04 Robert Bosch Gmbh Hand held machine tool having rotational driving device and/or impact driving device
JP2006102935A (en) * 2004-09-30 2006-04-20 Hilti Ag Drill and/or chisel hammer
JP2006326763A (en) * 2005-05-26 2006-12-07 Matsushita Electric Works Ltd Rotating tool
JP2008514440A (en) * 2004-09-30 2008-05-08 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Hand-held machine tools, especially drills and / or hammers
JP2010105162A (en) * 2002-09-13 2010-05-13 Black & Decker Inc Rotary tool

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63120053A (en) * 1986-11-05 1988-05-24 Shibaura Eng Works Co Ltd Power tool
JP2010105162A (en) * 2002-09-13 2010-05-13 Black & Decker Inc Rotary tool
JP2005305647A (en) * 2004-04-24 2005-11-04 Robert Bosch Gmbh Hand held machine tool having rotational driving device and/or impact driving device
JP2006102935A (en) * 2004-09-30 2006-04-20 Hilti Ag Drill and/or chisel hammer
JP2008514440A (en) * 2004-09-30 2008-05-08 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Hand-held machine tools, especially drills and / or hammers
JP2006326763A (en) * 2005-05-26 2006-12-07 Matsushita Electric Works Ltd Rotating tool

Also Published As

Publication number Publication date
WO2013061835A1 (en) 2013-05-02

Similar Documents

Publication Publication Date Title
JP2016007658A (en) Reciprocation work tool
JP6441588B2 (en) Impact tool
JP6325360B2 (en) Impact tool
JP2013091117A (en) Striking tool
WO2015045734A1 (en) Impact tool
JP5356097B2 (en) Impact tool
JP2007175836A (en) Striking tool
CN107206584B (en) Working tool
JP2007203388A (en) Impact tool
JP2017042887A (en) Hammering tool
JP2014172141A (en) Hammer
JP2017042889A (en) Hammering tool
CN107107322B (en) Impact tool
JP6348337B2 (en) Reciprocating work tool
JP6612496B2 (en) Impact tool
JP2017042888A (en) Impact tool
EP3812097A1 (en) Rotary hammer
JP2021074796A (en) Striking tool
JP2012171063A (en) Impact tool
JP2007175837A (en) Hammering tool
JP5234414B2 (en) Impact tool
WO2016002818A1 (en) Striking tool
WO2012144568A1 (en) Impact tool
JP5913010B2 (en) Impact tool
JP2012232371A (en) Hammering tool

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140428

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20141202

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20150324