JP2005153033A - Motor-driven screw driver - Google Patents
Motor-driven screw driver Download PDFInfo
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- JP2005153033A JP2005153033A JP2003390943A JP2003390943A JP2005153033A JP 2005153033 A JP2005153033 A JP 2005153033A JP 2003390943 A JP2003390943 A JP 2003390943A JP 2003390943 A JP2003390943 A JP 2003390943A JP 2005153033 A JP2005153033 A JP 2005153033A
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- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/0007—Connections or joints between tool parts
- B25B23/0042—Connection means between screwdriver handle and screwdriver shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
本発明は、電動ドライバに係り、特に、駆動モータからの回転駆動力をビットホルダに伝達するための回転伝達手段が、当該電動ドライバによりネジ締めを行うとき（正転時）よりも、ネジ緩めを行うとき（逆転時）の方が、大きい回転駆動力をビットホルダに伝達することができるようにした電動ドライバに関する。 The present invention relates to an electric driver, and in particular, a rotation transmitting means for transmitting a rotational driving force from a drive motor to a bit holder is loosened more than when a screw is tightened by the electric driver (during forward rotation). The present invention relates to an electric driver that can transmit a large rotational driving force to the bit holder when performing (when reversing).
電動ドライバは、締付けられたネジを緩める最初の時点において、同ネジを締付けるときよりも大きな回転駆動力を与えるようにすることが必要である。一方、ネジを締付ける場合には、余り過大な回転駆動力を与えると、ネジ自体や、ネジが締付けられる部材、そして電動ドライバ自体に過大な力をかけてしまい、それらを損傷する虞がある。
このため、電動ドライバは、通常、駆動モータからドライバビットへ回転駆動力を伝達する回転伝達手段は、ドライバビットに伝達する回転駆動力を一定以下に制限するトルク制限手段を有する。
The electric driver needs to give a larger rotational driving force at the first time of loosening the tightened screw than when the screw is tightened. On the other hand, when a screw is tightened, if an excessively large rotational driving force is applied, an excessive force is applied to the screw itself, a member to which the screw is tightened, and the electric driver itself, which may damage the screw.
For this reason, the electric driver usually has a torque limiting means for limiting the rotational driving force transmitted to the driver bit to a certain value or less as the rotational transmission means for transmitting the rotational driving force from the drive motor to the driver bit.
図1は、そのようなトルク制限手段の一例が示されている。このトルク制限手段１０においては、ドライバビットに回転駆動連結されている円筒状部材１２と、駆動モータからの回転駆動力を受け入れて回転する駆動軸１４と、該駆動軸の直径方向反対側の位置に設定された一対のローラ１６と、円筒状部材１２の直径方向反対側の位置に設けられた半径方向貫通孔内に設定された一対のボール２０と該ボールを半径方向内方に所定のバネ力Fで押圧するバネ手段（図示せず）とを有する。ネジ締付けのときは駆動軸１４が反時計方向に回転して、ローラ１６を（該ローラに対して実線で示す位置関係にある）ボール２０に係合させ、また、ネジ緩め時のときは駆動軸１４が時計方向に回転して、ローラ１６を（同ローラに対して一点鎖線で示す位置関係にある）ボール２０に係合させて、回転駆動力を同ボール２０、円筒状部材１２を介してドライバビットに伝達するようになっている。駆動軸１４から円筒状部材１２への回転駆動力が一定以上になると、ボール２０はそれに加えられている半径方向内方へのバネ力Fに抗して半径方向外側に変位し、それにより、駆動軸は空回りして、回転駆動力の伝達が遮断される（例えば、特許文献１）。このトルク制限手段では、このようにしてトルク制限を行うことは可能であるが、ネジを締めるときも緩めるときも、ローラがボールに対して係合する（駆動軸の回転中心軸線からの）半径方向位置が同じであるために、伝達できる回転駆動力の最大値は同じとなり、従って、前述のネジ緩め時により大きな駆動力を与えるようにするという要求を満たすことはできない。 FIG. 1 shows an example of such torque limiting means. In this torque limiting means 10, a cylindrical member 12 that is rotationally connected to a driver bit, a drive shaft 14 that rotates by receiving a rotational drive force from the drive motor, and a position on the diametrically opposite side of the drive shaft And a pair of balls 20 set in a radial through hole provided at a position opposite to the diameter direction of the cylindrical member 12 and a predetermined spring inwardly in the radial direction. Spring means (not shown) for pressing with force F. When the screw is tightened, the drive shaft 14 rotates counterclockwise to engage the roller 16 with the ball 20 (in a positional relationship indicated by a solid line with respect to the roller), and when the screw is loosened, the drive shaft 14 is driven. The shaft 14 rotates in the clockwise direction, and the roller 16 is engaged with the ball 20 (which is in a positional relationship indicated by the alternate long and short dash line with respect to the roller). To the driver bit. When the rotational driving force from the drive shaft 14 to the cylindrical member 12 exceeds a certain value, the ball 20 is displaced radially outward against the radially inward spring force F applied thereto. The drive shaft rotates idly and transmission of rotational driving force is interrupted (for example, Patent Document 1). With this torque limiting means, it is possible to limit the torque in this way, but the radius (from the rotation center axis of the drive shaft) that the roller engages with the ball whether the screw is tightened or loosened. Since the directional positions are the same, the maximum value of the rotational driving force that can be transmitted is the same, and therefore, it is not possible to satisfy the requirement of applying a larger driving force when the screw is loosened.
これに対して、回転駆動軸１４を図2に示すような形状のものとし、これにより、ネジ緩めのために駆動軸１４を時計方向に回転するときには、ネジ締付けのために駆動軸１４を反時計方向に回転するときに比べて、ボール２０に対する当該回転駆動軸の係合位置を、図示のように、同回転駆動軸１４の回転中心軸から離れた半径方向位置で係合することにより、より大きな回転駆動力を該ボール２０へ伝達することができるようにした形式のものがある。（例えば、特許文献２）
このようなものにおいては、当該ドリルを一定期間使用すると、回転駆動軸１４のボール２０との係合部分に磨耗が生じて、それらの係合位置が半径方向内側に変位し、そのために、回転駆動軸からボール２０へ加えられる回転駆動力が減少してしまうことがある。
On the other hand, the rotational drive shaft 14 has a shape as shown in FIG. 2, so that when the drive shaft 14 is rotated clockwise for loosening the screw, the drive shaft 14 is counteracted for screw tightening. Compared to when rotating in the clockwise direction, the engagement position of the rotation drive shaft with respect to the ball 20 is engaged at a radial position away from the rotation center axis of the rotation drive shaft 14 as shown in the figure, There is a type in which a larger rotational driving force can be transmitted to the ball 20. (For example, Patent Document 2)
In such a case, when the drill is used for a certain period of time, the engagement portion of the rotary drive shaft 14 with the ball 20 is worn, and the engagement position is displaced inward in the radial direction. The rotational driving force applied to the ball 20 from the drive shaft may decrease.
更に、ワンウエイクラッチを用いて、ネジ緩め時だけにおいて、所要の回転駆動力を回転駆動軸から、同回転駆動軸が空回りすることなく、ボールに伝達するようにした形式のものがあるが、その場合には、緩めるネジが硬く締められ過ぎていると、駆動モータが焼損したり、作業者が当該ドライバを抑えきれずに怪我をしたりしてしまう、といった虞がある。 Furthermore, there is a type that uses a one-way clutch to transmit the required rotational driving force from the rotational drive shaft to the ball without idling only when the screw is loosened. In some cases, if the screw to be loosened is too tight, the drive motor may burn out, or the operator may be unable to hold down the driver and may be injured.
本発明は、上記の如き問題を解消した回転伝達手段を備えた電動ドライバを提供することを目的とするものである。 An object of the present invention is to provide an electric driver provided with a rotation transmission means that solves the above problems.
すなわち、本発明は、
ドライバビットを固定保持するビットホルダと、
駆動モータからの回転駆動力をビットホルダに伝達するための回転伝達手段と、
を備える電動ドライバであって、
回転伝達手段が、
駆動モータからの回転駆動力を受け入れて回転駆動される回転入力部材と、
該回転入力部材に係合されて、該回転入力部材から、同回転入力部材の回転中心軸線の周りでの回転駆動力を伝達されるローラと、
上記ビットホルダに駆動連結されると共に、上記回転入力部材の上記回転中心軸線を中心に回転可能とされた回転出力部材と、
該回転出力部材に保持され、上記駆動ローラに係合されて、該駆動ローラから回転駆動力を伝達され、該回転駆動力を当該回転出力部材に伝達する被駆動ボールと
を有し、
上記駆動ローラが、上記回転駆動入力部材が上記回転中心軸線を中心に正転するときと、逆転するときとで、上記回転入力部材に対して変位し、上記被駆動ボールに対して、上記回転中心軸線からの異なる方向位置で係合し、それにより、上記回転入力部材から当該駆動ローラ、被駆動ボールを介して上記回転出力部材へ伝達する回転駆動力が異なるようにしたことを特徴とする電動ドライバを提供する。
この電動ドライバによれば、駆動ローラから被駆動ボールへ伝達される回転駆動力を、正転時と逆転時とで変えることができるので、ネジの締付け時、及び、緩め時において、適正な回転駆動力を発生させることが可能となる。また、駆動ローラとボールとの係合により回転駆動力を伝達するようにしているので、前述した磨耗による回転駆動力の減少を低減することができる。
That is, the present invention
A bit holder for fixing and holding the driver bit;
A rotation transmission means for transmitting the rotational driving force from the drive motor to the bit holder;
An electric driver comprising:
Rotation transmission means
A rotational input member that receives rotational driving force from the drive motor and is rotationally driven;
A roller that is engaged with the rotation input member, and from which the rotation driving force is transmitted around the rotation center axis of the rotation input member;
A rotational output member that is drivingly connected to the bit holder and is rotatable about the rotational center axis of the rotational input member;
A driven ball that is held by the rotation output member, is engaged with the drive roller, receives a rotation drive force from the drive roller, and transmits the rotation drive force to the rotation output member;
The drive roller is displaced with respect to the rotation input member when the rotation drive input member rotates forward and backward about the rotation center axis, and rotates with respect to the driven ball. The rotational driving force transmitted from the rotational input member to the rotational output member via the driving roller and the driven ball is made different by engaging at different positions from the central axis. Provide electric driver.
According to this electric driver, the rotational driving force transmitted from the driving roller to the driven ball can be changed between forward rotation and reverse rotation, so that proper rotation can be achieved at the time of screw tightening and loosening. A driving force can be generated. Further, since the rotational driving force is transmitted by the engagement between the driving roller and the ball, the reduction in the rotational driving force due to the wear described above can be reduced.
具体的には、回転出力部材を回転入力部材の周りに同心円状にされた円筒状部分を有するものとし、被駆動ボールを、該円筒状部分によって保持するようにし、駆動ローラが、上記回転入力部材が正転するときと、逆転するときとで、上記回転中心軸線を中心にした半径方向の異なる位置で上記被駆動ボールと係合するようにすることができる。 Specifically, the rotation output member has a cylindrical portion concentrically formed around the rotation input member, the driven ball is held by the cylindrical portion, and the drive roller has the rotation input described above. The driven ball can be engaged with the driven ball at different positions in the radial direction around the rotation center axis when the member rotates forward and when the member rotates backward.
また、より具体的には、回転入力部材が、該回転入力部材が正転して駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第1保持部と、同回転入力部材が逆転して駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第2保持部と、駆動ローラが第1保持部と第2保持部との間で変位するのを許容する変位部とを有するボール保持部を備えるようにすることができる。 More specifically, the rotation input member has the same rotation input as the first holding portion that holds the drive roller when the rotation input member rotates forward and the drive roller engages the driven ball. When the member reverses and the driving roller engages with the driven ball, the second holding portion that holds the driving roller, and the driving roller is displaced between the first holding portion and the second holding portion. A ball holding portion having an allowable displacement portion can be provided.
別の具体例としては、
上記回転入力部材が、上記回転中心軸線に直角をなし、上記回転出力部材に面する第1面を有し、
上記回転出力部材が、上記第１面に向かい平行にされた第２面を有する円盤状の部材とされ、
該回転出力部材が、上記第２面から反対側の面まで延びた貫通孔を有し、該貫通孔内に上記被駆動ボールを保持して、上記第２面から上記第1面に向けて部分的に突出するようにしており、
上記第1面が、上記駆動ローラを、その軸線が上記回転中心軸線からの半径方向に沿って配置されるようにして保持し、且つ、該駆動ローラが、上記回転入力部材が正転するときと、逆転するときとで、上記第２面までの距離が異なる位置で上記被駆動ボールと係合するようにすることができる。
As another specific example,
The rotation input member is perpendicular to the rotation center axis and has a first surface facing the rotation output member;
The rotation output member is a disk-shaped member having a second surface parallel to the first surface;
The rotation output member has a through hole extending from the second surface to the opposite surface, holds the driven ball in the through hole, and extends from the second surface toward the first surface. It ’s partly protruding,
The first surface holds the drive roller such that its axis is arranged along the radial direction from the rotation center axis, and when the rotation input member is rotated forward by the drive roller And when it reverses, it can be made to engage with the said driven ball in the position where the distance to the said 2nd surface differs.
より具体的には、回転入力部材が、
該回転入力部材が正転するときに上記駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第1保持部と、
同回転入力部材が逆転するときに上記駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第2保持部と、
駆動ローラが第1保持部と第2保持部との間で変位するのを許容する変位部と
を有するボール保持部を備え
第１保持部において保持される駆動ローラが、第２保持部において保持される駆動ローラよりも、上記第２面に近づいた位置とされて被駆動ボールに係合されるようにすることができる。
More specifically, the rotation input member is
A first holding portion for holding the driving roller when the driving roller is engaged with the driven ball when the rotation input member rotates forward;
A second holding portion for holding the driving roller when the driving roller is engaged with the driven ball when the rotation input member is reversed;
A ball holding portion having a displacement portion that allows the driving roller to be displaced between the first holding portion and the second holding portion is provided. The driving roller held in the first holding portion is held in the second holding portion. The driven roller is positioned closer to the second surface than the driven roller and can be engaged with the driven ball.
更に具体的には、上記被駆動ボールが、当該出力回転部材の上記第２面及びその反対側の面から突出するようなサイズとされ、上記反対側の面に隣接して設定されたボール押圧部材により所定バネ力で上記駆動ローラに向けて押圧されるようにすることができる。 More specifically, the ball pressure is set so that the driven ball protrudes from the second surface of the output rotating member and the opposite surface thereof, and is set adjacent to the opposite surface. The member can be pressed toward the drive roller with a predetermined spring force.
以下、本発明に係る電動ドライバの実施形態を添付図面（図3乃至図7）に基づき説明する。
図3は、本発明に係る電動ドライバ１００の縦断面図であり、図４は図３におけるA-A線断面図でネジ締付け時の状態を、また、図５は図３におけるネジ緩め時の状態を示している。
Embodiments of an electric driver according to the present invention will be described below with reference to the accompanying drawings (FIGS. 3 to 7).
3 is a longitudinal sectional view of the electric driver 100 according to the present invention, FIG. 4 is a sectional view taken along the line AA in FIG. 3, and FIG. 5 is a state when the screw is loosened in FIG. Show.
図示のように、電動ドライバ１００は、（図３で見て右端から挿入される）ドライバビット（図示せず）を固定保持するためのビットホルダ１０２と、（図1で見て左端に設定される）駆動モータ（図示せず）からの回転駆動力をビットホルダ１０２に伝達するための回転伝達手段１０４とを備える。 As shown in the figure, the electric screwdriver 100 is set to a bit holder 102 for fixing and holding a driver bit (not shown) (inserted from the right end as viewed in FIG. 3) and a left end as viewed in FIG. And a rotation transmission means 104 for transmitting a rotational driving force from a drive motor (not shown) to the bit holder 102.
回転伝達手段１０４は、駆動モータからの回転駆動力を減速機１０５を介して受け入れて回転駆動される回転入力部材１０６と、該回転入力部材１０６に係合されて、該回転入力部材１０６から、同回転入力部材１０６の回転中心軸線の周りでの回転駆動力を伝達される駆動ローラ１０８と、ビットホルダ１０２に駆動連結されると共に、上記回転入力部材１０６の上記回転中心軸線を中心に回転可能とされた回転出力部材１１０と、該回転出力部材１１０に保持され、駆動ローラ１０８に係合されて、該駆動ローラ１０８から回転駆動力の伝達を受け、該回転駆動力を当該回転出力部材１１０に伝達する被駆動ボール１１２と、を有する。 The rotation transmitting means 104 receives the rotational driving force from the drive motor via the speed reducer 105 and is rotationally driven. The rotational input member 106 is engaged with the rotational input member 106, and from the rotational input member 106, The rotation input member 106 is connected to a driving roller 108 to which a rotational driving force around the rotation center axis is transmitted and a bit holder 102, and is rotatable about the rotation center axis of the rotation input member 106. The rotation output member 110 is held by the rotation output member 110 and is engaged with the drive roller 108 to receive the rotation drive force from the drive roller 108, and the rotation drive force is transmitted to the rotation output member 110. And a driven ball 112 that transmits to the motor.
回転出力部材１１０は、回転入力部材１０６の周りに同心円状に形成された円筒状部分１１０−１を有し、被駆動ボール１１２が、該円筒状部分１１０−１に形成された半径方向貫通孔１１０−２内に半径方向で変位可能に保持されている。 The rotation output member 110 has a cylindrical portion 110-1 formed concentrically around the rotation input member 106, and a driven ball 112 is formed in a radial through hole formed in the cylindrical portion 110-1. 110-2 is held so as to be displaceable in the radial direction.
回転入力部材１０６は、断面が図４及び図５に示すような溝型のローラ保持部１０６−１を有しており、該ローラ保持部１０６−１は、ネジ締付け時に、当該回転入力部材１０６が（当該電動ドライバのドリルビット側からモータ側を見た状態で）反時計方向に回転して、駆動ローラ１０８が被駆動ボール１１２に係合するときに、該駆動ローラ１０８を保持する第1保持部１０６−２と、ネジ緩め時に同回転入力部材１０６が逆転して駆動ローラ１０８が被駆動ボール１１２に係合するときに、該駆動ローラ１０８を保持する第２保持部１０６−３と、駆動ローラ１０８が第1保持部１０６−２と第2保持部１０６−３との間で変位するのを許容する変位部１０６−４と有している。詳細には、該ローラ保持部１０６−１は、全体としては回転中心軸線を中心とした円柱状とされた回転入力部材１０６の直径方向で反対側の位置に、直径に対してほぼ直角をなす変位部１０６−４と、該変位部１０６−４の一端に駆動ローラ１０８の曲面に一致するように湾曲して設けられた第１保持部１０６−２、他端に同様に半径方向外側に湾曲して設けられた第２保持部１０６−３を有し、第２の保持部１０６−３により保持された駆動ローラ１０８の（上記回転中心軸線からの）半径方向位置ｂが、第１の保持部１０６−２により保持された駆動ローラ１０８の（上記回転中心軸線からの）半径方向位置ａよりも大きくなるようにされている。被駆動ボール１１２は、後述するように回転中心軸線に向けて所定バネ力Ｆがかけられており、回転入力部材１０６から駆動ローラ１０８を介して伝達される（該ボール１１２と駆動ローラ１０８の中心とを結ぶ線に沿った方向での）力の半径方向外向き分力が、当該バネ力Ｆ以上になると、当該被駆動ボール１１２が半径方向外側に変位されることにより、回転駆動力の伝達はできなくなるが、同バネ力以下においては、被駆動ボール１１２は図示の位置に保持され、該被駆動ボール１１２に伝達される力の接線方向分力が回転出力部材１１０の回転駆動力として作用することになる。従って、上述のように、第２の保持部１０６−３は、第１保持部１０６−２よりも、（上記回転中心軸線から離れた）半径方向位置ｂで保持するようになっており、図５における角度βは、図４における角度αよりも大きくなり、ネジ緩め時の方が、大きな回転駆動力を回転出力部材１１０に与えることができるようになっている。 The rotary input member 106 has a groove-type roller holding portion 106-1 as shown in FIGS. 4 and 5, and the roller holding portion 106-1 is rotated when the screw is tightened. Is rotated in the counterclockwise direction (when viewed from the drill bit side of the electric driver on the motor side) and the driving roller 108 is engaged with the driven ball 112, the first holding the driving roller 108. A holding portion 106-2, a second holding portion 106-3 that holds the driving roller 108 when the rotation input member 106 reverses when the screw is loosened and the driving roller 108 engages the driven ball 112; The driving roller 108 has a displacement portion 106-4 that allows displacement between the first holding portion 106-2 and the second holding portion 106-3. Specifically, the roller holding portion 106-1 is substantially perpendicular to the diameter at a position opposite to the diametrical direction of the rotary input member 106 having a cylindrical shape centered on the rotation center axis. Displacement portion 106-4, first holding portion 106-2 that is curved and provided at one end of displacement portion 106-4 so as to match the curved surface of drive roller 108, and similarly curved radially outward at the other end. And the radial position b (from the rotation center axis) of the driving roller 108 held by the second holding portion 106-3 is the first holding portion. The driving roller 108 held by the section 106-2 is configured to be larger than the radial position a (from the rotation center axis). The driven ball 112 is applied with a predetermined spring force F toward the rotation center axis as will be described later, and is transmitted from the rotation input member 106 via the driving roller 108 (the center of the ball 112 and the driving roller 108). When the radially outward component of the force (in the direction along the line connecting the two) becomes greater than or equal to the spring force F, the driven ball 112 is displaced radially outward, thereby transmitting the rotational driving force. However, below the spring force, the driven ball 112 is held at the position shown in the figure, and the tangential component of the force transmitted to the driven ball 112 acts as the rotational driving force of the rotation output member 110. Will do. Therefore, as described above, the second holding portion 106-3 is held at the radial position b (away from the rotation center axis) than the first holding portion 106-2. The angle β in 5 is larger than the angle α in FIG. 4, and a larger rotational driving force can be applied to the rotation output member 110 when the screw is loosened.
図３において、１２０は当該電動ドライバの円筒状ハウジング部分であり、該円筒状ハウジング部分の先端には、被駆動ボール１１２への半径方向内向きのバネ力を調節可能に与えるためのバネ圧調整手段１２４が設けられている。該バネ圧調整手段１２４は、円筒状ハウジング部分１２０の先端にネジ結合された円筒部材１２４−１と、該円筒部材内に軸線方向で可動に設けられ、被駆動ボール１１２に係合するテーパ面１２４−２を有するボール押圧部材１２４−３と、該ボール押圧部材１２４−３に図３で見て左方向へのバネ圧をかけるコイルバネ１２４−４と、円筒部材１２４−１の図３で見て右端に該円筒部材と同軸状に固定された先端円筒部材１２４−５にネジ係合され、螺回することにより軸線方向で変位し、バネ押圧部材１２４−６及びバネ端部係合部材１２４−７を介して、コイルバネ１２４−４に適宜の押圧力を与えるバネ調整部材１２４−８と、を有している。ドライバビット（図示せず）は、ビットホルダ１０２の中心孔１０２−１内に右側から挿入され、ロッキングボール１０２−２により固定されるようになっており、ビットホルダ１０２が挿入されると、当該電動ドライバの中心軸線に沿って伸びるパイロットピン１３０が左方へ押込まれ、駆動モータの起動スイッチに作用するようになっている。前述のように、ネジ締付け時に、締付けに対する抵抗が大きくなり、回転入力部材１０６から駆動ローラ１０８に伝達される力の半径方向外向きの分力が上記バネ力F以上になると、被駆動ボール１１２は半径方向外向きに変位され、それに伴ってボール押圧部材１２４−３が（図３で見て）右方へ変位され、同部材の右端部近傍にある傾斜面がボール１０２−３を半径方向内方へ押圧し、それにより、パイロットピン１３０を左方へ押込んで、駆動モータの起動スイッチを閉として、当該電動ドライバの駆動を停止する。 In FIG. 3, reference numeral 120 denotes a cylindrical housing portion of the electric driver, and a spring pressure adjustment for giving a radially inward spring force to the driven ball 112 in an adjustable manner at the tip of the cylindrical housing portion. Means 124 are provided. The spring pressure adjusting means 124 includes a cylindrical member 124-1 screwed to the tip of the cylindrical housing portion 120, and a tapered surface that is movably provided in the axial direction within the cylindrical member and engages the driven ball 112. A ball pressing member 124-3 having 124-2, a coil spring 124-4 for applying spring pressure to the ball pressing member 124-3 in the left direction as viewed in FIG. 3, and a cylindrical member 124-1, as viewed in FIG. The screw is engaged with the distal end cylindrical member 124-5 fixed coaxially with the cylindrical member at the right end, and is displaced in the axial direction by being screwed, so that the spring pressing member 124-6 and the spring end engaging member 124 are engaged. And a spring adjusting member 124-8 that applies an appropriate pressing force to the coil spring 124-4 via -7. A driver bit (not shown) is inserted into the center hole 102-1 of the bit holder 102 from the right side and is fixed by a locking ball 102-2. When the bit holder 102 is inserted, A pilot pin 130 extending along the central axis of the electric driver is pushed leftward so as to act on the start switch of the drive motor. As described above, when the screw is tightened, the resistance to tightening is increased, and when the component of the force transmitted from the rotation input member 106 to the driving roller 108 in the radial direction exceeds the spring force F, the driven ball 112 Is displaced outward in the radial direction, and accordingly, the ball pressing member 124-3 is displaced to the right (as viewed in FIG. 3), and an inclined surface near the right end of the member causes the ball 102-3 to move in the radial direction. Pushing inward, thereby pushing the pilot pin 130 to the left, closing the drive motor start switch and stopping the drive of the electric driver.
図６及び図７は、本発明に係る電動ドライバの他の実施形態を示している。
この電動ドライバは、基本的構成は同じであるが、回転入力部材１０６と回転出力部材１１０との間の回転駆動力の伝達機構が、前述の実施形態のものと異なっている。
6 and 7 show another embodiment of the electric driver according to the present invention.
This electric driver has the same basic configuration, but the transmission mechanism of the rotational driving force between the rotational input member 106 and the rotational output member 110 is different from that of the above-described embodiment.
すなわち、この実施形態においては、回転入力部材１０６は、回転出力部材１１０に向う第１面（すなわち、図７における右向き面）１０６−５を有し、一方、回転出力部材１１０は、第1面１０６−５に面して平行とされた第２面１１０−３を有する円盤状部材とされている。回転出力部材１１０は、上記回転軸線方向に延びる貫通孔１１０−４が形成され、該貫通孔１１０−４内に被駆動ボール１１２が変位可能に保持されている。第1面１０６−５は、駆動ローラ１０８をその軸線が上記回転中心軸線を中心にした半径方向に沿うようにして保持しており、該駆動ローラ１０８が、回転入力部材１０６の回転に伴って、被駆動ボール１１２に円周方向で係合するようになっている。 That is, in this embodiment, the rotation input member 106 has a first surface 106-5 facing the rotation output member 110 (that is, a right-facing surface in FIG. 7) 106-5, while the rotation output member 110 has a first surface. A disk-shaped member having a second surface 110-3 facing and parallel to 106-5. The rotation output member 110 has a through hole 110-4 extending in the rotation axis direction, and the driven ball 112 is held in the through hole 110-4 so as to be displaceable. The first surface 106-5 holds the drive roller 108 so that its axis is along the radial direction centering on the rotation center axis, and the drive roller 108 is rotated along with the rotation of the rotation input member 106. The driven ball 112 is engaged in the circumferential direction.
具体的には、図７に示すように、回転入力部材１０６の第１面１０６−５には、上記回転軸線とした周方向に沿って延び、第２面に面して開口したローラ保持部１０６−１が形成されており、該ローラ保持部１０６−１内に駆動ローラ１０８が、その軸線が上記円周方向に直交する方向（すなわち、直径方向）になるようにして転動可能に設定されている。ローラ保持部１０６−１の（図７において下側の）端部は、ネジ緩め時において回転入力部材１０６が反時計方向に回転したときに、駆動ローラ１０８が被駆動ボール１１２に係合することにより当該下側の端部に係合されて、同被駆動ボール１１２を反時計方向に回し続けるための第２保持部１０６−３を形成している。また、ローラ保持部１０６−１の反対側の（図７において上側の）端部は、ネジ締め時において回転入力部材１０６が時計方向に回転されたときに、被駆動ボール１１２に係合することにより当該端部に係合されて、同被駆動ボール１１２を介して回転出力部材１１０を回し続ける第１保持部１０６−２を形成している。この実施形態においては、ボール押圧部１２４−３が回転出力部材１１０に隣接した円盤状とされており、被駆動ボール１１２を駆動ローラ１０８に押圧するように軸線方向でのバネ力を当該回転出力部材１１０にかけている。 Specifically, as shown in FIG. 7, the first surface 106-5 of the rotation input member 106 has a roller holding portion that extends along the circumferential direction as the rotation axis and opens toward the second surface. 106-1 is formed, and the driving roller 108 is set so as to be able to roll in the roller holding portion 106-1 so that its axis is in a direction perpendicular to the circumferential direction (that is, the diameter direction). Has been. The end of the roller holding portion 106-1 (on the lower side in FIG. 7) is such that the driving roller 108 engages the driven ball 112 when the rotation input member 106 rotates counterclockwise when the screw is loosened. Thus, the second holding portion 106-3 is formed to be engaged with the lower end portion and keep the driven ball 112 rotating counterclockwise. Further, the opposite end (upper side in FIG. 7) of the roller holding portion 106-1 is engaged with the driven ball 112 when the rotation input member 106 is rotated clockwise during screw tightening. Thus, a first holding portion 106-2 that is engaged with the end portion and continues to rotate the rotation output member 110 via the driven ball 112 is formed. In this embodiment, the ball pressing portion 124-3 has a disk shape adjacent to the rotation output member 110, and a spring force in the axial direction is applied to the rotation output so as to press the driven ball 112 against the driving roller 108. It is applied to the member 110.
図示のように、ローラ保持溝の底面は傾斜しており、上記第２保持部１０６−３においては浅く、第１保持部１０６−２においては深くなるようになっている。このため、第２保持部１０６−３において保持された駆動ローラ１０８は第１保持部１０６−２において保持された駆動ローラ１０８よりも、より第２面１１０−３に近づいた位置となって、被駆動ボール１１２に係合し、従って、第１の実施形態の場合と同様に、第１保持部におけるよりも大きな回転駆動力を回転出力部材１１０に与えることができるようになっている。 As shown in the figure, the bottom surface of the roller holding groove is inclined so that the second holding portion 106-3 is shallow and the first holding portion 106-2 is deep. For this reason, the driving roller 108 held by the second holding unit 106-3 is closer to the second surface 110-3 than the driving roller 108 held by the first holding unit 106-2. Accordingly, the rotational output member 110 can be applied with a larger rotational driving force than that in the first holding portion, as in the case of the first embodiment.
１００ 電動ドライバ
１０２ ビットホルダ
１０２−１ 中心孔
１０２−２ ロッキングボール
１０２−３ ロッキングボール
１０４ 回転伝達手段
１０５ 減速機
１０６ 回転入力部材
１０６−１ ローラ保持部
１０６−２ 第1保持部
１０６−３ 第２保持部
１０６−４ 変位部
１０６−５ 第１面
１０８ 駆動ローラ
１１０ 回転出力部材
１１０−１ 円筒状部分
１１０−２ 半径方向貫通孔
１１０−３ 第２面
１１０−４ 貫通孔
１１２ 被駆動ボール
１２０ 円筒ハウジング部分
１２４ バネ圧調整手段
１２４−１ 円筒部材
１２４−２ テーパ面
１２４−３ ボール押圧部材
１２４−４ コイルバネ
１２４−５ 先端円筒部材
１２４−６ バネ押圧部材
１２４−７ バネ端部係合部材
１２４−８ バネ調整部材
１３０ パイロットピン
ａ 半径方向位置
ｂ 半径方向位置
Ｆ バネ力
α 角度
β 角度
DESCRIPTION OF SYMBOLS 100 Electric driver 102 Bit holder 102-1 Center hole 102-2 Locking ball 102-3 Locking ball 104 Rotation transmission means 105 Decelerator 106 Rotation input member 106-1 Roller holding | maintenance part 106-2 1st holding | maintenance part 106-3 2nd Holding portion 106-4 Displacement portion 106-5 First surface 108 Driving roller 110 Rotation output member 110-1 Cylindrical portion 110-2 Radial direction through hole 110-3 Second surface 110-4 Through hole 112 Driven ball 120 Cylinder Housing part 124 Spring pressure adjusting means 124-1 Cylindrical member 124-2 Tapered surface 124-3 Ball pressing member 124-4 Coil spring 124-5 Tip cylindrical member 124-6 Spring pressing member 124-7 Spring end engaging member 124- 8 Spring adjusting member 130 Pilot pin a Radial position b Radial position F Spring α angle β angle
Claims (6)
駆動モータからの回転駆動力をビットホルダに伝達するための回転伝達手段と、
を備える電動ドライバであって、
回転伝達手段が、
駆動モータからの回転駆動力を受け入れて回転駆動される回転入力部材と、
該回転入力部材に係合されて、該回転入力部材から、同回転入力部材の回転中心軸線の周りでの回転駆動力を伝達される駆動ローラと、
上記ビットホルダに駆動連結されると共に、上記回転入力部材の上記回転中心軸線を中心に回転可能とされた回転出力部材と、
該回転出力部材に保持され、上記駆動ローラに係合されて、該駆動ローラから回転駆動力を伝達され、該回転駆動力を当該回転出力部材に伝達する被駆動ボールと
を有し、
上記駆動ローラは、上記回転駆動入力部材が上記回転中心軸線を中心に正転するときと、逆転するときとで、上記回転入力部材に対して変位し、上記被駆動ボールに対して異なる点で係合し、それにより、上記回転入力部材から当該駆動ローラ、被駆動ボールを介して上記回転出力部材へ伝達する上記回転中心軸線の周りでの回転駆動力が異なるようにした
ことを特徴とする電動ドライバ。 A bit holder for fixing and holding the driver bit;
A rotation transmission means for transmitting the rotational driving force from the drive motor to the bit holder;
An electric driver comprising:
Rotation transmission means
A rotational input member that receives rotational driving force from the drive motor and is rotationally driven;
A driving roller that is engaged with the rotation input member, and from which the rotation driving force is transmitted around the rotation center axis of the rotation input member;
A rotational output member that is drivingly connected to the bit holder and is rotatable about the rotational center axis of the rotational input member;
A driven ball that is held by the rotation output member, is engaged with the drive roller, receives a rotation drive force from the drive roller, and transmits the rotation drive force to the rotation output member;
The drive roller is displaced with respect to the rotation input member when the rotation drive input member rotates forward and backward about the rotation center axis, and differs with respect to the driven ball. The rotation driving force around the rotation center axis transmitted from the rotation input member to the rotation output member via the drive roller and the driven ball is made different. Electric screwdriver.
上記被駆動ボールが、該円筒状部分によって保持されており、
上記駆動ローラは、上記回転入力部材が正転するときと、逆転するときとで、上記回転中心軸線を中心にした半径方向の異なる位置で上記被駆動ボールと係合するようにされている
ことを特徴とする請求項1に記載の電動ドライバ。 The rotational output member has a cylindrical portion concentrically around the rotational input member;
The driven ball is held by the cylindrical portion;
The drive roller is configured to engage with the driven ball at different positions in the radial direction around the rotation center axis when the rotation input member rotates forward and when it rotates reversely. 2. The electric driver according to claim 1, wherein:
該回転入力部材が正転して上記駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第1保持部と、
同回転入力部材が逆転して上記駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第2保持部と、
駆動ローラが第1保持部と第2保持部との間で変位するのを許容する変位部と
を有するボール保持部を備える
ことを特徴とする請求項２に記載の電動ドライバ。 The rotation input member is
A first holding portion that holds the drive roller when the rotation input member rotates forward and the drive roller engages the driven ball;
A second holding portion for holding the drive roller when the rotation input member is reversed and the drive roller engages the driven ball;
The electric driver according to claim 2, further comprising a ball holding portion having a displacement portion that allows the driving roller to be displaced between the first holding portion and the second holding portion.
上記回転出力部材は、上記第１面に向かい平行にされた第２面を有する円盤状の部材とされ、
該回転出力部材は、上記第２面から反対側の面まで延びた貫通孔を有し、該貫通孔内に上記被駆動ボールを保持して、上記第２面から上記第1面に向けて部分的に突出するようにしており、
上記第1面は、上記駆動ローラを、その軸線が上記回転中心軸線からの半径方向に沿って配置されるようにして保持し、且つ、駆動ローラが、上記回転入力部材が正転するときと、逆転するときとで、上記第２面までの距離が異なる位置で上記被駆動ボールと係合するようにされている
ことを特徴とする請求項1に記載の電動ドライバ。 The rotation input member is perpendicular to the rotation center axis, and has a first surface facing the rotation output member,
The rotation output member is a disk-shaped member having a second surface parallel to the first surface,
The rotation output member has a through hole extending from the second surface to the opposite surface, holds the driven ball in the through hole, and extends from the second surface toward the first surface. It ’s partly protruding,
The first surface holds the drive roller such that the axis thereof is arranged along the radial direction from the rotation center axis, and the drive roller rotates forward of the rotation input member. 2. The electric driver according to claim 1, wherein the electric driver is engaged with the driven ball at a position where the distance to the second surface is different when the motor is reversely rotated.
該回転入力部材が正転して上記駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第1保持部と、
同回転入力部材が逆転して上記駆動ローラが被駆動ボールに係合するときに、該駆動ローラを保持する第2保持部と、
駆動ローラが第1保持部と第2保持部との間で変位するのを許容する変位部と
を有するボール保持部を備え
第１保持部において保持される駆動ローラが、第２保持部において保持される駆動ローラよりも、上記第２面に近づいた位置とされて被駆動ボールに係合されるようにした
ことを特徴とする請求項４に記載の電動ドライバ。 The rotation input member is
A first holding portion that holds the drive roller when the rotation input member rotates forward and the drive roller engages the driven ball;
A second holding portion for holding the drive roller when the rotation input member is reversed and the drive roller engages the driven ball;
A ball holding portion having a displacement portion that allows the driving roller to be displaced between the first holding portion and the second holding portion is provided. The driving roller held in the first holding portion is held in the second holding portion. 5. The electric driver according to claim 4, wherein the electric driver is engaged with the driven ball at a position closer to the second surface than the driven roller.
The driven ball is sized so as to protrude from the second surface of the output rotating member and the surface on the opposite side thereof, and with a predetermined spring force by a ball pressing member set adjacent to the surface on the opposite side. The electric driver according to claim 5, wherein the electric driver is pressed toward the driving roller.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003390943A JP3992676B2 (en) | 2003-11-20 | 2003-11-20 | Electric screwdriver |
| KR1020040064928A KR100556041B1 (en) | 2003-11-20 | 2004-08-18 | Electric driver |
| TW093135651A TWI253377B (en) | 2003-11-20 | 2004-11-19 | Electric driver |
| CNB2004100942038A CN100345661C (en) | 2003-11-20 | 2004-11-19 | Electric driver |
| HK06100054.7A HK1080031B (en) | 2003-11-20 | 2006-01-04 | Electric screwdriver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003390943A JP3992676B2 (en) | 2003-11-20 | 2003-11-20 | Electric screwdriver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005153033A true JP2005153033A (en) | 2005-06-16 |
| JP3992676B2 JP3992676B2 (en) | 2007-10-17 |
Family
ID=34718167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003390943A Expired - Fee Related JP3992676B2 (en) | 2003-11-20 | 2003-11-20 | Electric screwdriver |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3992676B2 (en) |
| KR (1) | KR100556041B1 (en) |
| CN (1) | CN100345661C (en) |
| HK (1) | HK1080031B (en) |
| TW (1) | TWI253377B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011251355A (en) * | 2010-05-31 | 2011-12-15 | Hitachi Koki Co Ltd | Power tool |
| EP2898989A4 (en) * | 2012-09-21 | 2016-07-06 | Nitto Kohki Co | Electric screwdriver |
| WO2017038846A1 (en) * | 2015-08-31 | 2017-03-09 | 日東工器株式会社 | Power tool |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010030055A1 (en) * | 2010-06-15 | 2011-12-15 | Hilti Aktiengesellschaft | Electrically operated bolt gun and method for operating the bolt gun |
| JP6482351B2 (en) | 2015-03-27 | 2019-03-13 | 日東工器株式会社 | Screwing member tightening tool |
| TWI622468B (en) * | 2015-12-25 | 2018-05-01 | 日東工器股份有限公司 | Screwing member fastening tool and driving time setting method in screwing member fastening tool |
| TWI702117B (en) * | 2019-08-07 | 2020-08-21 | 佳銘精密工業有限公司 | Torque joint structure |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58160063A (en) * | 1982-03-15 | 1983-09-22 | 日東工器株式会社 | Motor driver |
| JPS60153767U (en) * | 1984-03-23 | 1985-10-14 | 日本電気精器株式会社 | electric screwdriver |
| DE3636026A1 (en) * | 1986-10-23 | 1988-04-28 | Hilti Ag | HAND DEVICE WITH TOOL HOLDER |
| JP2991002B2 (en) * | 1993-05-12 | 1999-12-20 | 日本電気精器株式会社 | Torque control mechanism for micro torque driver |
| CN2174300Y (en) * | 1993-09-02 | 1994-08-17 | 辛富荣 | Clutch for electric screwdriver |
| JP2000190246A (en) * | 1998-12-21 | 2000-07-11 | Nakamura Seisakusho:Kk | Torque driver |
-
2003
- 2003-11-20 JP JP2003390943A patent/JP3992676B2/en not_active Expired - Fee Related
-
2004
- 2004-08-18 KR KR1020040064928A patent/KR100556041B1/en active IP Right Grant
- 2004-11-19 TW TW093135651A patent/TWI253377B/en active
- 2004-11-19 CN CNB2004100942038A patent/CN100345661C/en active Active
-
2006
- 2006-01-04 HK HK06100054.7A patent/HK1080031B/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011251355A (en) * | 2010-05-31 | 2011-12-15 | Hitachi Koki Co Ltd | Power tool |
| EP2898989A4 (en) * | 2012-09-21 | 2016-07-06 | Nitto Kohki Co | Electric screwdriver |
| US9902051B2 (en) | 2012-09-21 | 2018-02-27 | Nitto Kohki Co., Ltd. | Electric screwdriver |
| WO2017038846A1 (en) * | 2015-08-31 | 2017-03-09 | 日東工器株式会社 | Power tool |
| JPWO2017038846A1 (en) * | 2015-08-31 | 2018-06-21 | 日東工器株式会社 | Power tool |
| US11052528B2 (en) | 2015-08-31 | 2021-07-06 | Nitto Kohki Co., Ltd. | Power tool |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100556041B1 (en) | 2006-03-03 |
| CN100345661C (en) | 2007-10-31 |
| TWI253377B (en) | 2006-04-21 |
| HK1080031B (en) | 2008-06-06 |
| JP3992676B2 (en) | 2007-10-17 |
| CN1657235A (en) | 2005-08-24 |
| TW200529987A (en) | 2005-09-16 |
| KR20050049324A (en) | 2005-05-25 |
| HK1080031A1 (en) | 2006-04-21 |
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