JP2002321162A - Electric tightening tool - Google Patents
Electric tightening toolInfo
- Publication number
- JP2002321162A JP2002321162A JP2001121946A JP2001121946A JP2002321162A JP 2002321162 A JP2002321162 A JP 2002321162A JP 2001121946 A JP2001121946 A JP 2001121946A JP 2001121946 A JP2001121946 A JP 2001121946A JP 2002321162 A JP2002321162 A JP 2002321162A
- Authority
- JP
- Japan
- Prior art keywords
- planetary gear
- gear mechanism
- elastic body
- fastening tool
- oil pulse
- 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
Links
Landscapes
- Vibration Prevention Devices (AREA)
- General Details Of Gearings (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、モータにより回転
駆動され衝撃力を発生するオイルパルス機構を備えた電
動締結工具に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fastening tool having an oil pulse mechanism which is driven to rotate by a motor and generates an impact force.
【０００２】[0002]
【従来の技術】従来における電動締結工具のオイルパル
ス機構は、特開昭５９−１２９６７５号公報に開示され
ているように、金属同士の衝突音が生じない低騒音型の
製品である。オイルパルス機構は、モータにより回転さ
れるライナに形成した空洞内にオイルを充填、密閉し、
このライナ内に嵌挿した出力軸に設けた２個の羽根挿入
溝内に羽根を嵌挿し、この羽根を常に出力軸の外周方向
に付勢してライナに当接するように構成されており、更
にライナを回転駆動することによりライナの内周面に形
成したシール部と出力軸の外周面に形成したシール部と
が合致した時にオイルパルス機構内に発生する圧力によ
り衝撃トルクが得られるように構成されている。2. Description of the Related Art A conventional oil pulse mechanism for an electric fastening tool is a low-noise type product which does not generate collision noise between metals, as disclosed in Japanese Patent Application Laid-Open No. 59-129675. The oil pulse mechanism fills and seals the oil in the cavity formed in the liner rotated by the motor,
The blades are inserted into the two blade insertion grooves provided on the output shaft inserted into the liner, and the blades are constantly biased in the outer peripheral direction of the output shaft to abut on the liner, Further, by rotating the liner, the impact torque is obtained by the pressure generated in the oil pulse mechanism when the seal formed on the inner peripheral surface of the liner and the seal formed on the outer peripheral surface of the output shaft coincide with each other. It is configured.
【０００３】[0003]
【発明が解決しようとする課題】上記オイルパルス機構
を用いた電動締結工具は、モータの回転力によりオイル
パルス機構部内のオイルを急激に圧力上昇させ、その時
に発生する圧力を利用してネジやボルトを締付けるもの
である。この圧力は、オイルパルス機構部の出力軸とラ
イナケースとの相対速度により決定されており、ネジの
締付とボルトの締付とでは大きな差が生じる。つまり、
ネジの締付時は、ネジが常に回転しているため、相対速
度が小さく高いピーク圧力は発生しないが、ボルトの締
付時は、ボルトが回転しないため相対速度が大きく常に
高いピーク圧力が発生し続けるため、結果的にオイルパ
ルス部のオイル洩れが生じ、締付トルクが低下してしま
うという問題があった。The electric fastening tool using the above-mentioned oil pulse mechanism increases the pressure of the oil in the oil pulse mechanism rapidly by the rotational force of the motor, and utilizes the pressure generated at that time to remove the screw or the like. This is to tighten the bolt. This pressure is determined by the relative speed between the output shaft of the oil pulse mechanism and the liner case, and there is a large difference between the tightening of the screw and the tightening of the bolt. That is,
When the screw is tightened, the relative speed is small and high peak pressure does not occur because the screw is constantly rotating, but when tightening the bolt, the relative speed is large and the peak pressure is always high because the bolt does not rotate. As a result, there is a problem that oil leakage occurs in the oil pulse portion and the tightening torque is reduced.
【０００４】本発明の目的は、上記問題を解消し、ボル
トの締付時にオイルパルス機構内で発生する高いピーク
圧力を低下させることにより、オイル洩れによる締付ト
ルクの低下を抑制する電動締結工具を提供することであ
る。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to reduce a high peak pressure generated in an oil pulse mechanism at the time of bolt tightening, thereby suppressing a decrease in tightening torque due to oil leakage. It is to provide.
【０００５】[0005]
【課題を解決するための手段】上記目的は、駆動源であ
るモータと、モータの回転動力を伝達する遊星歯車機構
部と、遊星歯車機構部からの回転出力により回転される
オイルパルス機構部と、オイルパルス機構部及び遊星歯
車機構部を収容するハンマケースとを備えた電動締結工
具において、遊星歯車機構部とハンマケースとの間に弾
性体を設けることにより達成される。SUMMARY OF THE INVENTION The object of the present invention is to provide a motor as a drive source, a planetary gear mechanism for transmitting the rotational power of the motor, and an oil pulse mechanism rotated by a rotation output from the planetary gear mechanism. In an electric fastening tool including an oil pulse mechanism and a hammer case accommodating a planetary gear mechanism, this is achieved by providing an elastic body between the planetary gear mechanism and the hammer case.
【０００６】また、上記目的は、駆動源であるモータ
と、モータの回転動力を伝達する遊星歯車機構部と、遊
星歯車機構部からの回転出力により回転されるオイルパ
ルス機構部と、オイルパルス機構部及び遊星歯車機構部
を収容するハンマケースとを備えた電動締結工具におい
て、遊星歯車機構部とオイルパルス機構部との連結部外
周に弾性体を設けることにより達成される。Another object is to provide a motor as a drive source, a planetary gear mechanism for transmitting the rotational power of the motor, an oil pulse mechanism rotated by a rotation output from the planetary gear mechanism, and an oil pulse mechanism. In an electric fastening tool provided with a hammer case for accommodating a planetary gear mechanism and a planetary gear mechanism, this is achieved by providing an elastic body on the outer periphery of a connection between the planetary gear mechanism and the oil pulse mechanism.
【０００７】また、上記目的は、駆動源であるモータ
と、モータの回転動力を伝達する遊星歯車機構部と、遊
星歯車機構部からの回転出力により回転されるオイルパ
ルス機構部と、オイルパルス機構部及び遊星歯車機構部
を収容するハンマケースとを備えた電動締結工具におい
て、遊星歯車機構部とハンマケースとの間に弾性体を設
け、且つ遊星歯車機構部とオイルパルス機構部との連結
部外周に弾性体を設けることにより達成される。Another object of the present invention is to provide a motor as a drive source, a planetary gear mechanism for transmitting the rotational power of the motor, an oil pulse mechanism rotated by a rotation output from the planetary gear mechanism, and an oil pulse mechanism. An electric fastening tool including a hammer case for accommodating a planetary gear mechanism and a planetary gear mechanism, wherein an elastic body is provided between the planetary gear mechanism and the hammer case, and a connecting part between the planetary gear mechanism and the oil pulse mechanism is provided. This is achieved by providing an elastic body on the outer periphery.
【０００８】[0008]
【発明の実施の形態】本実施例における電動締結工具を
図１〜図６を用いて説明する。図１は本実施例における
電動締結工具を示す一部縦断側面図、図２は図１のＡ−
Ａ線断面図、図３及び図４は図１のＢ−Ｂ線断面図、図
５は本実施例におけるオイルパルス機構部４とギヤホル
ダ３４との連結部８に設ける弾性体７を示す外観図、図
６は本実施例におけるオイルパルス機構部４とギヤホル
ダ３４との連結部８に設ける他の弾性体７を示す外観図
である。DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric fastening tool according to this embodiment will be described with reference to FIGS. FIG. 1 is a partially longitudinal side view showing an electric fastening tool according to this embodiment, and FIG.
3 and 4 are cross-sectional views taken along the line BB of FIG. 1. FIG. 5 is an external view showing an elastic body 7 provided in a connecting portion 8 between the oil pulse mechanism 4 and the gear holder 34 in the present embodiment. FIG. 6 is an external view showing another elastic body 7 provided in the connecting portion 8 between the oil pulse mechanism 4 and the gear holder 34 in this embodiment.
【０００９】図１に示すように電動締結工具は、ハウジ
ング２内或いはハンマケース６内に、モータ１、遊星歯
車機構部３、オイルパルス機構部４、出力軸５を有して
おり、図示しない蓄電池によりモータ１を駆動し、モー
タ１の先端に連結されるピニオン３１を介して遊星歯車
機構部３にモータ１の回転動力を伝達し、遊星歯車機構
部３に連結されるオイルパルス機構部４を駆動すること
により、オイルパルス機構部４内のオイルに急激な圧力
変化（圧力上昇）を与えることで衝撃力を発生させてい
る。この時、オイルパルス機構部４は、出力軸５とライ
ナケース４ａとの相対速度により圧力を上昇させている
ため、図２に示すように遊星歯車機構部３の一部である
リングギヤ３２の回り止め部３３と、この回り止め部３
３を収容するハンマケース６との間に、図５に示す弾性
ゴム７ａ或いは図６に示す板バネ７ｂなどの弾性体７を
設け、衝撃トルクが発生した時にリングギヤ３２の回り
止め部３３にギヤホルダ３４を介して負荷を伝達し、こ
れにより弾性体７を変形させてリングギヤ３２が回転方
向に一定角度変位させている。このような構成により、
遊星歯車機構部３と連結しているライナケース４ａとの
角速度が小さくなるため、出力軸５とライナケース４ａ
との相対速度が小さくなり、ボルトの締付時における高
いピーク圧力を低減することができる。なお、弾性体７
は、ネジの締付時の発生圧力では変形しないように、予
めつぶし代を設け初期荷重を設定してある。つまり、ボ
ルトの締付時におけるピーク圧力が発生した時にのみ弾
性体７を変形させ、ネジの締付時に弾性体７が変形しな
いようにすることで、ネジの締付スピードに影響を与え
ることなく、且つ高いピーク圧力を低下させることがで
きるように設けられている。As shown in FIG. 1, the electric fastening tool includes a motor 1, a planetary gear mechanism 3, an oil pulse mechanism 4, and an output shaft 5 in a housing 2 or a hammer case 6, not shown. The motor 1 is driven by the storage battery, the rotational power of the motor 1 is transmitted to the planetary gear mechanism 3 via a pinion 31 connected to the tip of the motor 1, and the oil pulse mechanism 4 is connected to the planetary gear mechanism 3. , A sudden pressure change (pressure rise) is applied to the oil in the oil pulse mechanism 4 to generate an impact force. At this time, since the oil pulse mechanism 4 increases the pressure by the relative speed between the output shaft 5 and the liner case 4a, the oil pulse mechanism 4 rotates around the ring gear 32, which is a part of the planetary gear mechanism 3, as shown in FIG. Stop part 33 and this detent part 3
An elastic body 7 such as an elastic rubber 7a shown in FIG. 5 or a leaf spring 7b shown in FIG. 6 is provided between the hammer case 6 and the hammer case 6 for accommodating the ring gear 32. The load is transmitted through the ring 34, thereby deforming the elastic body 7 and displacing the ring gear 32 in the rotational direction by a certain angle. With such a configuration,
Since the angular velocity of the liner case 4a connected to the planetary gear mechanism 3 decreases, the output shaft 5 and the liner case 4a
, And the high peak pressure at the time of bolt tightening can be reduced. The elastic member 7
Is provided with a crushing allowance and an initial load is set in advance so as not to be deformed by the pressure generated when the screw is tightened. That is, the elastic body 7 is deformed only when a peak pressure is generated at the time of tightening the bolt, and the elastic body 7 is not deformed at the time of tightening the screw, without affecting the screw tightening speed. And a high peak pressure can be reduced.
【００１０】図３及び図４は、オイルパルス機構部４と
遊星歯車機構部３の一部であるギヤホルダ３４との連結
部８外周に弾性体７を設けた例を示しており、図３はギ
ヤホルダ３４の内部に多角形面である六角形状の穴を設
け、この穴に弾性体７を設けた構成を示している。ま
た、図４はギヤホルダ３４の内部に多角形面である四角
形状の穴を設け、この穴に弾性体７を設けた構成を示し
ている。なお、上述したように弾性体７は、ネジの締付
時の圧力変化により変形しないように、予めつぶし代を
設け初期荷重を発生するように設定されている。このよ
うな構成によりボルトの締付時の高いピーク圧力を低下
させている。なお、図３及び図４に示すように連結部の
形状を六角形状或いは四角形状にすることにより、弾性
体７の個数及び弾性体７の変形量或いは寿命を調整する
ことができる。FIGS. 3 and 4 show an example in which an elastic body 7 is provided on the outer periphery of a connecting portion 8 between the oil pulse mechanism 4 and a gear holder 34 which is a part of the planetary gear mechanism 3. FIG. A configuration is shown in which a hexagonal hole that is a polygonal surface is provided inside the gear holder 34, and the elastic body 7 is provided in this hole. FIG. 4 shows a configuration in which a quadrangular hole which is a polygonal surface is provided inside the gear holder 34 and the elastic body 7 is provided in this hole. As described above, the elastic body 7 is set so as to generate an initial load by providing a crushing margin in advance so that the elastic body 7 is not deformed due to a pressure change at the time of screw tightening. With such a configuration, a high peak pressure at the time of bolt tightening is reduced. The number of elastic members 7 and the amount of deformation or life of elastic members 7 can be adjusted by making the shape of the connecting portion hexagonal or square as shown in FIGS.
【００１１】[0011]
【発明の効果】本発明によれば、遊星歯車機構部とハン
マケースとの間に弾性体を設けることで、ボルトの締付
時にオイルパルス内で発生する高いピーク圧力を低下さ
せてオイル洩れによる締付トルクの低下を抑制する電動
締結工具を提供することができる。According to the present invention, by providing an elastic body between the planetary gear mechanism and the hammer case, a high peak pressure generated in an oil pulse at the time of bolt tightening is reduced to reduce oil leakage. An electric fastening tool that suppresses a decrease in tightening torque can be provided.
【００１２】また、遊星歯車機構部とオイルパルス機構
部との連結部外周に弾性体を設けることで、ボルトの締
付時にオイルパルス内で発生する高いピーク圧力を低下
させてオイル洩れによる締付トルクの低下を抑制する電
動締結工具を提供することができる。Further, by providing an elastic body on the outer periphery of the connecting portion between the planetary gear mechanism and the oil pulse mechanism, the high peak pressure generated in the oil pulse when the bolt is tightened is reduced, and the tightening due to oil leakage is performed. An electric fastening tool that suppresses a decrease in torque can be provided.
【００１３】また、遊星歯車機構部とハンマケースとの
間に弾性体を設け、且つ遊星歯車機構部とオイルパルス
機構部との連結部外周に弾性体を設けることで、ボルト
の締付時にオイルパルス内で発生する高いピーク圧力を
低下させてオイル洩れによる締付トルクの低下を抑制す
る電動締結工具を提供することができる。An elastic body is provided between the planetary gear mechanism and the hammer case, and an elastic body is provided on the outer periphery of the connection between the planetary gear mechanism and the oil pulse mechanism, so that the oil can be tightened when the bolt is tightened. It is possible to provide an electric fastening tool that suppresses a decrease in tightening torque due to oil leakage by reducing a high peak pressure generated in a pulse.
【図１】 本発明になる電動締結工具を示す一部縦断側
面図である。FIG. 1 is a partially longitudinal side view showing an electric fastening tool according to the present invention.
【図２】 図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】 図１のＢ−Ｂ線断面図である。FIG. 3 is a sectional view taken along line BB of FIG. 1;
【図４】 図１のＢ−Ｂ線断面図である。FIG. 4 is a sectional view taken along line BB of FIG. 1;
【図５】 本発明になる電動締結工具における遊星歯車
機構部及びハンマケース間、遊星歯車機構部及びオイル
パルス機構部との連結部外周に設ける弾性体を示す外観
図である。FIG. 5 is an external view showing an elastic body provided between the planetary gear mechanism and the hammer case and on the outer periphery of a connection part between the planetary gear mechanism and the oil pulse mechanism in the electric fastening tool according to the present invention.
【図６】 本発明になる電動締結工具における遊星歯車
機構部及びハンマケース間、遊星歯車機構部及びオイル
パルス機構部との連結部外周に設ける他の弾性体を示す
外観図である。FIG. 6 is an external view showing another elastic body provided between the planetary gear mechanism and the hammer case in the electric fastening tool according to the present invention, and on the outer periphery of a connection portion between the planetary gear mechanism and the oil pulse mechanism.
１はモータ、２はハウジング、３は遊星歯車機構部、４
はオイルパルス機構部、４ａはライナケース、５は出力
軸、６はハンマケース、７は弾性体、７ａは弾性ゴム、
７ｂは板バネ、８は連結部、３１はピニオン、３２はリ
ングギヤ、３３はリングギヤの回り止め部、３４はギヤ
ホルダである。1 is a motor, 2 is a housing, 3 is a planetary gear mechanism, 4
Is an oil pulse mechanism, 4a is a liner case, 5 is an output shaft, 6 is a hammer case, 7 is an elastic body, 7a is elastic rubber,
7b is a leaf spring, 8 is a connecting part, 31 is a pinion, 32 is a ring gear, 33 is a detent part of the ring gear, and 34 is a gear holder.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ１６Ｈ 57/02 Ｆ１６Ｈ 57/02 ３０４Ｇ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F16H 57/02 F16H 57/02 304G
Claims (9)
動力を伝達する遊星歯車機構部と、該遊星歯車機構部か
らの回転出力により回転されるオイルパルス機構部と、
該オイルパルス機構部及び前記遊星歯車機構部を収容す
るハンマケースとを備えた電動締結工具において、前記
遊星歯車機構部と前記ハンマケースとの間に弾性体を設
けることを特徴とする電動締結工具。A motor as a drive source, a planetary gear mechanism for transmitting rotational power of the motor, an oil pulse mechanism rotated by a rotation output from the planetary gear mechanism,
An electric fastening tool comprising the oil pulse mechanism and a hammer case accommodating the planetary gear mechanism, wherein an elastic body is provided between the planetary gear mechanism and the hammer case. .
部を構成するリングギヤの回り止め部と、該リングギヤ
の回り止め部を収容するハンマケースとの間に設けるこ
とを特徴とする請求項１記載の電動締結工具。2. The elastic body is provided between a detent part of a ring gear constituting a part of the planetary gear mechanism part and a hammer case for accommodating the detent part of the ring gear. Item 2. The electric fastening tool according to Item 1.
衝撃力により、前記弾性体を弾性変形しながら前記リン
グギヤが回転方向に一定角度変位することを特徴とする
請求項２記載の電動締結工具。3. The electric fastening tool according to claim 2, wherein the ring gear is displaced by a predetermined angle in a rotational direction while elastically deforming the elastic body by an impact force generated by the oil pulse mechanism.
期荷重を発生させるように設けられていることを特徴と
する請求項１または請求項２の何れか記載の電動締結工
具。4. The electric fastening tool according to claim 1, wherein the elastic body is provided so as to generate an initial load by providing a crushing allowance in advance.
動力を伝達する遊星歯車機構部と、該遊星歯車機構部か
らの回転出力により回転されるオイルパルス機構部と、
該オイルパルス機構部及び前記遊星歯車機構部を収容す
るハンマケースとを備えた電動締結工具において、前記
遊星歯車機構部と前記オイルパルス機構部との連結部外
周に弾性体を設けることを特徴とする電動締結工具。5. A motor as a drive source, a planetary gear mechanism for transmitting rotational power of the motor, an oil pulse mechanism rotated by a rotation output from the planetary gear mechanism,
In an electric fastening tool including the oil pulse mechanism and a hammer case accommodating the planetary gear mechanism, an elastic body is provided on an outer periphery of a connecting portion between the planetary gear mechanism and the oil pulse mechanism. Electric fastening tool.
部を構成するギヤホルダの内部に設けた多角形面と、前
記オイルパルス機構部との連結部外周に設けることを特
徴とする請求項５記載の電動締結工具。6. The elastic body is provided on a polygonal surface provided inside a gear holder constituting a part of the planetary gear mechanism, and on an outer periphery of a connecting portion with the oil pulse mechanism. Item 6. The electric fastening tool according to Item 5.
動力を伝達する遊星歯車機構部と、該遊星歯車機構部か
らの回転出力により回転されるオイルパルス機構部と、
該オイルパルス機構部及び前記遊星歯車機構部を収容す
るハンマケースとを備えた電動締結工具において、前記
遊星歯車機構部と前記ハンマケースとの間に弾性体を設
け、且つ前記遊星歯車機構部と前記オイルパルス機構部
との連結部外周に弾性体を設けることを特徴とする電動
締結工具。7. A motor as a drive source, a planetary gear mechanism for transmitting rotational power of the motor, an oil pulse mechanism rotated by a rotation output from the planetary gear mechanism,
In an electric fastening tool including the oil pulse mechanism and a hammer case that houses the planetary gear mechanism, an elastic body is provided between the planetary gear mechanism and the hammer case, and the planetary gear mechanism includes An electric fastening tool, wherein an elastic body is provided on an outer periphery of a connection portion with the oil pulse mechanism.
徴とする請求項７記載の電動締結工具。8. The electric fastening tool according to claim 7, wherein the elastic body is elastic rubber.
とする請求項７記載の電動締結工具。9. The electric fastening tool according to claim 7, wherein the elastic body is a leaf spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001121946A JP2002321162A (en) | 2001-04-20 | 2001-04-20 | Electric tightening tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001121946A JP2002321162A (en) | 2001-04-20 | 2001-04-20 | Electric tightening tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002321162A true JP2002321162A (en) | 2002-11-05 |
Family
ID=18971728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001121946A Pending JP2002321162A (en) | 2001-04-20 | 2001-04-20 | Electric tightening tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002321162A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006522577A (en) * | 2003-04-04 | 2006-09-28 | ヴィッテンシュタイン アーゲー | Electric motor and / or transmission |
| CN104816273A (en) * | 2014-05-26 | 2015-08-05 | 威海聚力微特电机有限公司 | Single phase variable frequency driving impact electric wrench |
| JP2016022569A (en) * | 2014-07-24 | 2016-02-08 | 瓜生製作株式会社 | Electric torque wrench |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02172676A (en) * | 1988-12-27 | 1990-07-04 | Kuken:Kk | Energy accumulating mechanism for power wrench |
| JPH02130711U (en) * | 1989-04-07 | 1990-10-29 | ||
| JPH0731281U (en) * | 1993-11-17 | 1995-06-13 | 株式会社マキタ | Buffer mechanism for electric oil pulse rotary tool |
| JP2002254336A (en) * | 2001-03-02 | 2002-09-10 | Hitachi Koki Co Ltd | Power tool |
| JP2002254335A (en) * | 2001-03-01 | 2002-09-10 | Hitachi Koki Co Ltd | Power tool |
-
2001
- 2001-04-20 JP JP2001121946A patent/JP2002321162A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02172676A (en) * | 1988-12-27 | 1990-07-04 | Kuken:Kk | Energy accumulating mechanism for power wrench |
| JPH02130711U (en) * | 1989-04-07 | 1990-10-29 | ||
| JPH0731281U (en) * | 1993-11-17 | 1995-06-13 | 株式会社マキタ | Buffer mechanism for electric oil pulse rotary tool |
| JP2002254335A (en) * | 2001-03-01 | 2002-09-10 | Hitachi Koki Co Ltd | Power tool |
| JP2002254336A (en) * | 2001-03-02 | 2002-09-10 | Hitachi Koki Co Ltd | Power tool |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006522577A (en) * | 2003-04-04 | 2006-09-28 | ヴィッテンシュタイン アーゲー | Electric motor and / or transmission |
| JP4847315B2 (en) * | 2003-04-04 | 2011-12-28 | ヴィッテンシュタイン アーゲー | Electric motor and / or transmission |
| CN104816273A (en) * | 2014-05-26 | 2015-08-05 | 威海聚力微特电机有限公司 | Single phase variable frequency driving impact electric wrench |
| JP2016022569A (en) * | 2014-07-24 | 2016-02-08 | 瓜生製作株式会社 | Electric torque wrench |
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