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WO2013061835A1 - Outil de frappe - Google Patents

Outil de frappe Download PDF

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Publication number
WO2013061835A1
WO2013061835A1 PCT/JP2012/076787 JP2012076787W WO2013061835A1 WO 2013061835 A1 WO2013061835 A1 WO 2013061835A1 JP 2012076787 W JP2012076787 W JP 2012076787W WO 2013061835 A1 WO2013061835 A1 WO 2013061835A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
tool
drive
gear
holder
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.)
Ceased
Application number
PCT/JP2012/076787
Other languages
English (en)
Japanese (ja)
Inventor
正規 古澤
義夫 杉山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Makita Corp
Original Assignee
Makita Corp
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 filed Critical Makita Corp
Publication of WO2013061835A1 publication Critical patent/WO2013061835A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/051—Couplings, e.g. special connections between components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other

Definitions

  • the present invention relates to a striking 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.
  • the output torque of the motor is high.
  • 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.
  • an impact tool for driving 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. Then, the tip tool is driven through the transmission.
  • the outer rotor type motor 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 of the same size. As a result, the hitting ability can be increased without increasing the hitting tool.
  • the transmission has a drive belt that transmits the rotational output of the motor.
  • the drive belt 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.
  • a striking mechanism is a structure driven via a drive belt.
  • 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.
  • 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.
  • the impact tool can be reduced in size.
  • the work tool has a torque limiter provided between the drive shaft and the first 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.
  • 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.
  • 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 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.
  • the torque limiter disables the integral rotation of the drive shaft and the first gear while maintaining the integral rotation state of the drive shaft and the drive belt when a torque greater than a predetermined torque is applied.
  • the drive shaft and the tip tool are arranged so that the major axis direction intersects.
  • the elements constituting the impact tool can be efficiently arranged by intersecting the major axis direction of the drive shaft and the tip tool. Thereby, the enlargement of an impact tool can be suppressed.
  • the tip tool, the striking mechanism, and the motor are arranged on the same axis.
  • the striking tool can be prevented from being enlarged in the direction in which the drive shaft extends.
  • FIG. 4 is a partially enlarged view of FIG. 3.
  • the hammer drill 100 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.
  • 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.
  • the motion conversion mechanism 120 is mainly composed of 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.
  • 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, an eccentric shaft 127, a piston 131, a connecting rod 129, and the like.
  • the crankshaft 125 is rotatably supported by the gear housing 105 via a bearing and rotates integrally with the driven pulley 123.
  • the eccentric shaft 127 is provided at a position shifted from the axis of the crankshaft 125.
  • the piston 131 is provided as a driver for driving the striking element 140.
  • the piston 131 is slidable in the cylinder 141 in the same direction as the long axis direction of the hammer bit 119.
  • the connecting rod 129 connects the piston 131 and the eccentric shaft 127.
  • 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 composed mainly of a striker 143 and an impact bolt 145.
  • the striker 143 is configured as a striker that is slidably disposed in the cylinder 141.
  • the impact bolt 145 is slidably disposed in the tool holder 159 and is configured as an intermediate element that transmits the kinetic energy of the striker 143 to the hammer bit 119.
  • 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 with (impacts) 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 mainly includes 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.
  • 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.
  • the mechanical torque limiter 167 is provided as a safety device against overload applied to the hammer bit 119.
  • a design value hereinafter also referred to as a maximum transmission torque value
  • 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 urging force of the spring 169, the mechanical torque limiter 167 is driven by the driving pulley. Torque is transmitted between 121 and the driven member 168. 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.
  • the mechanical torque limiter 167 is configured to block the torque transmission between the driving pulley 121 and the driven member 169.
  • 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.
  • 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.
  • 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.
  • the rotational output of the drive motor 110 is transmitted to the power transmission mechanism 150.
  • the tool holder 159 is rotationally driven, and the hammer bit 119 is rotated together with the tool holder 159.
  • 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 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.
  • the outer rotor type drive motor 110 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 an equivalent 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.
  • 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.
  • the mechanical torque limiter 167 interrupts torque transmission, so that the drive motor 110 continues to rotate. Can be prevented from being seized.
  • 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 integrally. 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.
  • the mechanical torque limiter 167 is disposed on the motor shaft 111, it is possible to prevent the unnecessary 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. Compared with the speed ratio of the driving pulley 121 and the driven pulley 123 before the hammer bit 119 bites into the workpiece, the speed of the driving pulley 121 and the driven pulley 123 is increased. The ratio changes. As a result, an unnecessary and urgent load acts on the belt 122.
  • 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 as the speed ratio of the driving pulley 121 and the driven pulley 123, it is possible to suppress an unnecessary and abrupt load from acting on the belt 122.
  • 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.
  • 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.
  • 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.
  • 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.
  • the mechanical torque limiter 167 may be provided on the side opposite to the small bevel gear 155 of the driving pulley 121.
  • 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.
  • 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 crank shaft 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.
  • the output of the drive motor 110 can be increased by using the outer rotor type drive motor 110 as compared to the 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.
  • 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.
  • the drive motor 110 can be reduced in size. That is, the electric hammer 200 can be downsized.
  • 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.
  • 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, it is possible to suppress the force applied by the user to the hand grip 107 arranged coaxially with the long axis of the hammer bit 119 from being converted into a moment. Force can be transmitted to the hammer bit 119.
  • the belt 122 is made of an elastomer such as rubber.
  • the belt 122 is not limited to this and may be made of leather, cloth, or a composite material made of elastomer and fibers.
  • the present invention is not limited to the configuration of the present embodiment.
  • the correspondence between each component of the present embodiment and each component of the present invention is shown below.
  • the hammer bit 119 is an example of a configuration corresponding to the “tip tool” of the present invention.
  • the motion conversion mechanism 120 is an example of a configuration corresponding to the “drive mechanism” of the present invention.
  • the power transmission mechanism 150 is an example of a configuration corresponding to the “drive mechanism” of the present invention.
  • the drive motor 110 is an example of a configuration corresponding to the “motor” of the present invention.
  • the motor shaft 111 is an example of a configuration corresponding to the “drive shaft” of the present invention.
  • the belt 122 is an example of a configuration corresponding to the “driving belt” of the present invention.
  • the belt 122 is an example of a configuration corresponding to the “transmission device” of the present invention.
  • the driving pulley 121 is an example of a configuration corresponding to the “transmission device” of the present invention.
  • the driven pulley 123 is an example of a configuration corresponding to the “transmission device” of the present invention.
  • the striking element 140 is an example of a configuration corresponding to the “striking mechanism” of the present invention.
  • the small bevel gear 155 is an example of a configuration corresponding to the “first gear” of the present invention.
  • the small bevel gear 155 is an example of a configuration corresponding to the “transmission device” of the present invention.
  • the large bevel gear 157 is an example of a configuration corresponding to the “second gear” of the present invention.
  • the large bevel gear 157 is an example of a configuration corresponding to the “transmission device” of the present invention.
  • the tool holder 159 is an example of a configuration corresponding to the “holder” of the present invention.
  • the mechanical torque limiter 167 is an example of a configuration corresponding to the “torque limiter” of the present invention.
  • the working tool according to the present invention can be configured in the following manner.
  • (Aspect 1) A striking tool that drives 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; An impact tool configured to drive the tip tool via the transmission.
  • (Aspect 2) A striking tool that drives 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 configured to drive the tip tool via a rotational output of the motor whose output rotational speed is changed by the transmission.
  • (Aspect 3) A striking tool according to the aspect 1 or 2
  • 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.
  • (Aspect 4) A striking tool according to the third aspect, The striking tool, wherein the striking mechanism is driven through the drive belt.
  • (Aspect 5) A striking tool according to any one of the first to fourth aspects, 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.
  • (Aspect 6) A striking tool according to the fifth aspect, The transmission device is characterized in that the first gear and the second gear are engaged with each other and rotated, and the drive shaft and the holder are directly connected in driving to rotate the holder.
  • (Aspect 7) A striking tool according to any one of the first to third aspects, An intermediate shaft provided separately from the drive shaft; A first gear rotatable integrally with the intermediate 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 driving tool, wherein the driving shaft is connected to the intermediate shaft through the driving belt to rotate the holder.
  • (Aspect 8) “A striking tool according to any one of the above aspects 5 to 7, 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

[Problème] L'invention concerne une technologie permettant de conserver une taille compacte pour un outil de frappe tout en maintenant un couple de sortie élevé. [Solution] Un marteau perforateur (100) est conçu pour entraîner un trépan de marteau (119) maintenu de manière amovible. Le trépan de marteau (100) comprend un moteur d'entraînement à rotor externe (110) doté d'un arbre de moteur (111), un dispositif de transmission permettant de modifier la vitesse de rotation de sortie du moteur d'entraînement (110) et un élément de frappe (140) entraîné par le moteur d'entraînement (110) et conçu pour déplacer le trépan de marteau (119) selon un mouvement réciproque linéaire dans une direction spécifique. Une configuration est conçue pour entraîner le trépan de marteau (119) par le biais de la sortie de rotation du moteur d'entraînement (110) dont la vitesse a été modifiée par le dispositif de transmission. Par conséquent, la sortie du moteur d'entraînement (110) peut être augmentée de manière à dépasser celle d'un moteur d'entraînement de type à rotor interne de taille similaire, ce qui permet d'éviter l'augmentation de la taille d'un marteau perforateur (100) nécessitant une sortie importante.
PCT/JP2012/076787 2011-10-24 2012-10-17 Outil de frappe Ceased WO2013061835A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-233126 2011-10-24
JP2011233126A JP2013091117A (ja) 2011-10-24 2011-10-24 打撃工具

Publications (1)

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WO2013061835A1 true WO2013061835A1 (fr) 2013-05-02

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WO (1) WO2013061835A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2923801A1 (fr) * 2014-03-24 2015-09-30 Makita Corporation Outil d'impact
CN111745595A (zh) * 2019-03-26 2020-10-09 株式会社牧田 集尘系统

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CN111745595A (zh) * 2019-03-26 2020-10-09 株式会社牧田 集尘系统
CN111745595B (zh) * 2019-03-26 2023-09-12 株式会社牧田 集尘系统

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