JPS62203771A - Electric driver - Google Patents
Electric driverInfo
- Publication number
- JPS62203771A JPS62203771A JP4704986A JP4704986A JPS62203771A JP S62203771 A JPS62203771 A JP S62203771A JP 4704986 A JP4704986 A JP 4704986A JP 4704986 A JP4704986 A JP 4704986A JP S62203771 A JPS62203771 A JP S62203771A
- Authority
- JP
- Japan
- Prior art keywords
- output shaft
- planetary gear
- ratchet
- internal gear
- gear
- 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.)
- Granted
Links
- 230000007246 mechanism Effects 0.000 claims description 38
- 230000009467 reduction Effects 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
この発明は電気モータの出力を歯車減速機構を介して出
力軸へ伝達し、ドライバビット等を回転させ、更に手動
によって項線可能な電動ドライバに関する。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to an electric screwdriver that transmits the output of an electric motor to an output shaft via a gear reduction mechanism, rotates a driver bit, etc., and can be manually operated.
従来の技術とその問題点
近時、携帯が便利で持運び自由な電池式電動ドライバが
普及して来た。この電池式電動ドライバの場合、電池の
節約の観点からも大きな締付トルクを必要とする場合は
補助的に手動による方が経済的なこともあり、更に電池
の残量が少なくなると十分な締付はトルクを付与するこ
とが出来ない場合が生じるので手動による増締めが出来
れば便利である。従来の電池式電動ドライバは締付トル
クを予め設定し、所定のトルクに達するとドライバビッ
トへのトルク伝達機構が空転しそれ以上の増締めは出来
ないものが多く、また電源がＯＦＦの状態では出力軸が
フリーとなって手動ドライバとして使用することが出来
ないものが多い。Conventional technology and its problems Recently, battery-powered electric screwdrivers, which are convenient and portable, have become popular. In the case of this battery-powered electric screwdriver, when a large tightening torque is required, it may be more economical to use it manually as an auxiliary tool in order to conserve battery power. Since there are cases where it is not possible to apply torque, it would be convenient if it could be retightened manually. With conventional battery-powered electric screwdrivers, the tightening torque is set in advance, and when the specified torque is reached, the torque transmission mechanism to the driver bit idles, making it impossible to tighten any further. In many cases, the output shaft becomes free and cannot be used as a manual driver.
従ってこのような電動ドライバではネジの締付は具合が
確認出来ず、また簡単に増締めが出来ないという不便が
ある。このような問題点を解決するため特開昭５８−２
１７２７４に提案されている電動ドライバのように遊星
歯車減速機構の後段の内歯歯車と出力軸との間にラチェ
ット機構を設けて電源ＯＦＦの状態で出力軸をロックし
て手動ドライバとしての使用が可能とし、電源○Ｎとす
ればこのロックが解除され通常の正・逆転可能な電動ド
ライバとして使用できるようになっているものや、特開
昭５８−１４９１８０に提案されているように、出力軸
の逆転防止を出力軸と先端部の円筒キャップとの間の手
動切換式ラチェ７）機構によって行うものなどがある。Therefore, with such an electric screwdriver, there is an inconvenience in that it is not possible to check the tightening condition of the screw, and it is not possible to easily retighten the screw. In order to solve these problems, Japanese Unexamined Patent Publication No. 58-2
Like the electric screwdriver proposed in No. 17274, a ratchet mechanism is installed between the internal gear at the latter stage of the planetary gear reduction mechanism and the output shaft, and the output shaft is locked when the power is turned off, allowing it to be used as a manual driver. If the power supply is set to ○N, this lock is released and the driver can be used as a normal forward/reverse electric screwdriver. There are some types in which reversal of the rotation is prevented by a manually-selectable latch 7) mechanism between the output shaft and the cylindrical cap at the tip.
これらの発明は電動・手動いずれにも使用出来るので大
変便利なものである。These inventions are very convenient because they can be used both electrically and manually.
しかし、いずれにしても出力は遊星歯車と出力軸との間
の伝達機構で行うので取付機構やラチェット機構が複雑
となり保守に不便という問題がある。電動ドライバによ
ってネジを締付ける場合、所定の締付トルクに設定した
後直ちに締付けを確認出来、且つ略−回転程度項線可能
で機構も比較的簡単な電動ドライバがあれば更に便利で
ある。However, in any case, since the output is performed by a transmission mechanism between the planetary gear and the output shaft, there is a problem that the mounting mechanism and ratchet mechanism are complicated and maintenance is inconvenient. When tightening screws with an electric screwdriver, it would be more convenient if there was an electric screwdriver that could confirm the tightening immediately after setting the predetermined tightening torque, that could rotate approximately -100 degrees, and that had a relatively simple mechanism.
問題点を解決するための手段
この発明は、電動モータの出力を、太陽歯車と遊星歯車
と内歯歯車等によって構成される遊星歯車減速機構を介
して出力軸に動力伝達する電動ドライバにおいて、前記
遊星歯車減速機構の最終出力端としての内歯歯車を出力
軸（）′ライバビット挿着軸）と摺動可能に配設し、前
記内歯歯車と出力軸とに互に直交する突起を設けて両突
起が当接することにより内歯歯車の回転力を出力軸に伝
達させる手段と、前記出力軸外周囲に刻設したラチェツ
ト歯と噛合するラチェツト爪と、一定範囲回動可能とし
た遊星歯車保持板に装着され前記ラチェツト爪を付勢す
るバネと、前記ラチェツト爪を回転自在に直接あるいは
間接的に外ケースに枢着して成るラチェット機構を備え
たものであって。Means for Solving the Problems The present invention provides an electric driver that transmits the output of an electric motor to an output shaft via a planetary gear reduction mechanism constituted by a sun gear, a planetary gear, an internal gear, etc. An internal gear serving as the final output end of the planetary gear reduction mechanism is arranged so as to be slidable on the output shaft ('river bit insertion shaft), and protrusions perpendicular to each other are provided on the internal gear and the output shaft. A means for transmitting the rotational force of the internal gear to the output shaft by the contact of both protrusions, a ratchet pawl that meshes with ratchet teeth carved around the outer periphery of the output shaft, and a planetary gear holder that is rotatable within a certain range. The ratchet mechanism includes a spring attached to a plate and urging the ratchet pawl, and a ratchet mechanism in which the ratchet pawl is rotatably pivoted directly or indirectly to the outer case.
外ケースを手動によって回転させたとき前記ラチェ・７
ト機構を介して前記出力軸がネジ進行方向に回転し、前
記出力軸と内歯歯車とに設けられた突起が再度結合すれ
ばラチェット機構が働き空転するようにしたことを特徴
とする電動ドライバであることを要旨としている。When the outer case is manually rotated, the ratchet 7
The electric screwdriver is characterized in that when the output shaft is rotated in the screw advancing direction via a ratchet mechanism and the protrusions provided on the output shaft and the internal gear are connected again, a ratchet mechanism is activated and the electric screwdriver rotates idly. The gist is that
作用 以上のような構成を有するこの発明において。action In this invention having the above configuration.
スイッチを入れると電動モータの出力軸と直結した太陽
歯車から遊星歯車と内歯歯車を介して遊星歯車保持板へ
回転が伝わり遊星歯車保持板と一体となっている第２番
目の太陽歯車、これに噛合した遊星歯車と内歯歯車を介
してこの第２番目の遊星歯車保持板及びこれと一体とな
った第３番目の太陽歯車へと回転が伝わる。When the switch is turned on, rotation is transmitted from the sun gear directly connected to the output shaft of the electric motor to the planetary gear holding plate via the planetary gear and internal gear, and the second sun gear is integrated with the planetary gear holding plate. Rotation is transmitted to the second planetary gear holding plate and the third sun gear integrated therewith via the planetary gear and the internal gear that mesh with the second planetary gear holding plate.
３番目の太陽歯車とこれに噛合する遊星歯車の回転によ
って最終端の内歯歯車に回転が伝わり、この内歯歯車と
出力軸とのそれぞれに設けた突起巷が当接結合してドラ
イバビットを回転させるのである。The rotation of the third sun gear and the planetary gear that meshes with it transmits the rotation to the internal gear at the final end, and the protrusion width provided on each of the internal gear and the output shaft abuts and connects to drive the driver bit. It rotates.
またこの３番目の太陽歯車の回転によりこれと噛合する
遊星歯車を回転させるがこの時この遊星歯車保持板は所
定の範囲回動する。同時に遊星歯車保持板に嵌着されラ
チェツト爪を付勢しているバネのバランスが変化して、
このラチェツト爪を出力軸の外周囲に刻設したラチェツ
ト歯と噛合させる。そしてこの状態で前記の如く出力軸
に挿着したドライバビットを回転させて所定の締付トル
クでネジを締付けるのである。Further, the rotation of the third sun gear rotates the planetary gear that meshes with the third sun gear, and at this time, the planetary gear holding plate rotates within a predetermined range. At the same time, the balance of the spring that is fitted into the planetary gear holding plate and biases the ratchet pawl changes.
This ratchet pawl is brought into mesh with ratchet teeth carved around the outer periphery of the output shaft. In this state, the screw is tightened with a predetermined tightening torque by rotating the driver bit inserted into the output shaft as described above.
しかして所定の締付トルクで締付けられた後項線めする
場合、電動ドライバの把持＃トケース）を回転させると
ラチェット機構が作動して内歯歯車と出力軸とのそれぞ
れに設けた突起の当接結合が離れ、ドライバビットを挿
着した出力軸がラチェツト爪に押されて回転し、出力軸
の突起が１回転して内歯歯車の突起と再度当接結合する
まで増締め出来る。しかし更にラチェット機構を作動さ
せると内歯歯車も回転するようになり、これと噛合して
いる遊星歯車の介在により遊星歯車保持板は前述の回動
方向とは逆方向へ回動し、゛同時にバネのバランスも前
述とは逆の方向へ変化しラチェツト爪も反対側が出力軸
外周のラチェ７）歯と噛合し、空回りして増締めは出来
″なくなる。但しネジを緩める場合はこの状態で手動に
より増締め以前の状態まで逆転可能である。However, when tightening the screws after tightening to a predetermined torque, rotating the grip case of the electric screwdriver activates the ratchet mechanism, causing the protrusions provided on the internal gear and output shaft to come into contact with each other. The coupling is separated, the output shaft with the driver bit inserted is pushed by the ratchet pawl and rotated, and the output shaft protrusion rotates once and can be further tightened until it is again abutted and coupled with the protrusion of the internal gear. However, when the ratchet mechanism is further activated, the internal gear also begins to rotate, and the planetary gear holding plate rotates in the opposite direction to the aforementioned rotational direction due to the interposition of the planetary gear meshing with the internal gear. The balance of the spring also changes in the opposite direction to the above, and the opposite side of the ratchet pawl meshes with the ratchet 7) teeth on the outer periphery of the output shaft, causing it to spin idly and making further tightening impossible.However, if you want to loosen the screw, use manual operation in this state. It is possible to reverse the condition to the state before retightening.
実施例
次にこの発明の具体的実施例について第１図乃至第６図
を参照して説明する。Embodiments Next, specific embodiments of the present invention will be described with reference to FIGS. 1 to 6.
第１図において、■は外ケースで内側後部には取付具２
を介してモータ３が収納されている。４は前端部を覆う
カバーでありドライバビットを挿着する出力軸の軸受を
兼ねている。In Figure 1, ■ is the outer case, and the inner rear part has a mounting bracket 2.
A motor 3 is housed through the housing. Reference numeral 4 denotes a cover that covers the front end, and also serves as a bearing for the output shaft into which the driver bit is inserted.
この外ケース１の内部には図示例の場合３組の遊星歯車
減速機構が組込まれており、１１は前記モータ３の出力
軸３ａに連結された太陽歯車、１２は該太陽歯車１１に
噛合している複数個の遊星歯車である。遊星歯車１２は
遊星歯車保持板１４に設けられた軸に回転自在に支持さ
れており、該遊星歯車保持板１４の他面には次段の遊星
歯車減速機構の太陽歯車２１が一体に成型されている。In the case of the illustrated example, three sets of planetary gear reduction mechanisms are built into the outer case 1, and numeral 11 is a sun gear connected to the output shaft 3a of the motor 3, and numeral 12 is a sun gear that meshes with the sun gear 11. It has multiple planetary gears. The planetary gear 12 is rotatably supported by a shaft provided on a planetary gear holding plate 14, and a sun gear 21 of the next stage planetary gear reduction mechanism is integrally molded on the other surface of the planetary gear holding plate 14. ing.
１３は遊星歯車１２と内接噛合する内歯歯車であり、二
段目の遊星歯車減速機構の内歯歯車を兼ねるようになっ
ている。二段目の遊星歯車減速機構は前記一段目の遊星
歯車保持板１４に一体成型された太陽歯車２１．該太陽
歯車２１に噛合した複数個の遊星歯車２２．該遊星歯車
２２を軸着した遊星歯車保持板２４及び一段目の遊星歯
車１２とも内接噛合している内歯歯車１３より構成され
ている。またこの二段目の遊星歯車保持板′２４の他面
には三段目の遊星歯車減速機構の太陽歯車３１が一体に
成型されている。Reference numeral 13 denotes an internal gear that internally meshes with the planetary gear 12, and serves also as an internal gear of the second stage planetary gear reduction mechanism. The second-stage planetary gear reduction mechanism includes a sun gear 21 integrally molded with the first-stage planetary gear holding plate 14. A plurality of planetary gears 22 meshed with the sun gear 21. It is composed of a planetary gear holding plate 24 on which the planetary gear 22 is pivoted, and an internal gear 13 that is internally meshed with the first stage planetary gear 12. Further, a sun gear 31 of the third stage planetary gear reduction mechanism is integrally molded on the other surface of the second stage planetary gear holding plate '24.
三段目の遊星歯車減速機構は前記二段目の遊星歯車保持
板２４と一体に成型された太陽歯車３１゜該太陽歯車３
１に噛合した複数個の遊星歯車３２、該遊星歯車３２を
軸着した遊星歯車保持板３４及び前記遊星歯車３２と内
接噛合する内歯歯車３３とより構成されている。前記内
歯歯車３３の内側（リブ）の適当な所にはピン３５を一
部突出するように植設し、また出力軸５にも前記ピン３
５と当接結合するようにピン５１を同じく一部突出する
ように植設する。そしてこれらのピンを当接結合させて
内歯歯車３３よりドライバビット、ドリルビット等を挿
着する出力軸５に動力を伝達する仕組になっているが、
この出力軸５の外周囲には後述するラチェツト爪６１と
噛合するようラチェツト歯６２が刻設されている。The third stage planetary gear reduction mechanism includes a sun gear 31° integrally molded with the second stage planetary gear holding plate 24.
1, a planetary gear holding plate 34 to which the planetary gears 32 are pivoted, and an internal gear 33 that internally meshes with the planetary gears 32. A pin 35 is implanted at an appropriate location on the inside (rib) of the internal gear 33 so as to partially protrude, and the pin 35 is also installed on the output shaft 5.
A pin 51 is also implanted so as to partially protrude so as to abut and connect with the pin 5. These pins are connected in contact with each other to transmit power from the internal gear 33 to the output shaft 5 into which the driver bit, drill bit, etc. are inserted.
Ratchet teeth 62 are formed on the outer periphery of the output shaft 5 so as to engage with ratchet pawls 61, which will be described later.
また、三段目の遊星歯車減速機構を構成する前記遊星歯
車保持板３４は第５図に示すように外側周囲に複数個の
突起部３４ａを形成し、また外ケース１には凹状溝１ａ
を形成しここに前記突起部３４ａを嵌入して所定範囲回
動出来るようにしである。尚、この突起３４ａには第５
図に示すようにラチェツト爪６１を付勢するバネ６３を
嵌着する。次に前記遊星歯車保持板３４と隣接し、内側
に出力軸５及びこれに植設したピン５１．内歯歯車３゛
３に植設したピン３５等を包囲する如く環状のラチェッ
ト取付板６４を外ケース１に固定して配置し、該ラチェ
ット取付板６４の周囲には均等に複数個のラチェツト爪
６１を配置し回転自在に枢着する。第２図乃至第４図は
第１図のＡ−Ａ矢視断面図の略図である。第２図に示す
ように最初バネ６３はラチェツト６１を出力軸５のラチ
ェツト歯６２に噛み合わせない中立の状態で付勢してい
るが、電動ドライバのスイッチを入れドライバビットを
正方向（ネジ進行方向または反時計方向）に回転させる
と内歯歯車３３の回転で、同時に遊星歯車保持板３４は
遊星歯車３２の介在によって第３図に示すように逆方向
（時計方向）に外ケース１の凹状溝１ａで規制されるま
で回動する。そしてドライバビットは、バネ６３の付勢
力の変化により、進行方向側のラチェツト爪６１を出力
軸５のラチェツト歯６２に噛合させた状態で回転する。Further, the planetary gear holding plate 34 constituting the third stage planetary gear reduction mechanism has a plurality of protrusions 34a formed around the outside as shown in FIG.
The protrusion 34a is inserted into the protrusion 34a so that the protrusion 34a can be rotated within a predetermined range. Note that this protrusion 34a has a fifth
As shown in the figure, a spring 63 that biases the ratchet pawl 61 is fitted. Next, adjacent to the planetary gear holding plate 34, an output shaft 5 and a pin 51 implanted therein. An annular ratchet mounting plate 64 is fixedly arranged on the outer case 1 so as to surround the pin 35 etc. implanted in the internal gear 3'3, and a plurality of ratchet pawls are arranged evenly around the ratchet mounting plate 64. 61 and are rotatably pivotally connected. 2 to 4 are schematic cross-sectional views taken along the line A--A in FIG. 1. As shown in FIG. 2, the spring 63 initially biases the ratchet 61 in a neutral state where it does not mesh with the ratchet teeth 62 of the output shaft 5, but when the electric screwdriver is switched on and the driver bit is moved in the forward direction (screw advance When the internal gear 33 rotates, the planetary gear holding plate 34 rotates in the opposite direction (clockwise) as shown in FIG. It rotates until it is regulated by the groove 1a. The driver bit rotates with the ratchet pawl 61 on the advancing direction meshing with the ratchet teeth 62 of the output shaft 5 due to changes in the biasing force of the spring 63.
そして所定の締付トルクに締めつけた後１手動によって
増締めする場合、前記する如く内歯歯車のピン３５と出
力軸５のピン５１とは当接結合しているが、外ケースを
手で回すことによって。If the pin 35 of the internal gear and the pin 51 of the output shaft 5 are abutted and connected as described above, when retightening is performed manually after tightening to a predetermined torque, the outer case must be turned by hand. By that.
この接触が離れて出力軸のみが回転し、１回転して再度
ピン同志が接触する回転角度まで増締めが可能となる。When this contact is separated, only the output shaft rotates, and after one rotation, it is possible to tighten the pins again until the rotation angle brings them into contact with each other.
しかし再度ビン同志が当接結合すると出力軸側の回転力
が内歯歯車３３に伝わり同時に遊星歯車３２の介在によ
って遊星歯車保持板３４が第４図に示すように、外ケー
スの凹状溝１ａで規制されるまで逆方向に回動する。従
ってバネ６３の付勢力が変化しラチェツト爪６１の反対
側の爪が出力軸５のラチェツト歯６２と噛合するので空
回りし、それ以上外ケースを回転させてもラチェット歯
６２はラチェツト爪６１を弾発させるだけで増締めは出
来なくなる。However, when the bins come into contact with each other again, the rotational force on the output shaft side is transmitted to the internal gear 33, and at the same time, due to the interposition of the planetary gear 32, the planetary gear holding plate 34 is moved into the concave groove 1a of the outer case as shown in FIG. Rotate in the opposite direction until regulated. Therefore, the biasing force of the spring 63 changes and the claw on the opposite side of the ratchet pawl 61 engages with the ratchet teeth 62 of the output shaft 5, causing idle rotation, and even if the outer case is rotated any further, the ratchet teeth 62 will not bounce off the ratchet pawl 61. If you just let it emit, you won't be able to retighten it.
反対に増締めした状態でネジをもとに戻す場合は増締め
以前の状態までは手動によって可能であるが、更にドラ
イバピットを逆方向（ネジを緩める方向または時計方向
）に回転させると、前記とは反対側のラチェツト爪６１
が出力軸のラチェツト歯６２と噛合するので手動による
ネジの緩めは出来なくなるが後は電動によって行えば良
い。On the other hand, if you want to return the screw to its original state after it has been retightened, it is possible to manually return it to the state before retightening, but if you further rotate the driver pit in the opposite direction (loosening the screw or clockwise), Ratchet pawl 61 on the opposite side
Since it engages with the ratchet teeth 62 of the output shaft, it is no longer possible to loosen the screw manually, but the rest can be done electrically.
このラチェット機構によって増締めの回転角度を更に大
きくするためには１回転してビン同志が再接触しラチェ
ット機構を作動させた時、出力軸５のピン５１が内歯歯
車３３に植設したビン３５からの反力を緩和し且つ内歯
歯車３３を回転させない即ち遊星歯車保持板３４を回動
させないようにすれば良い。そのためには出力軸を前後
方向に摺動可能とし、且つ第６図に示すように内歯歯車
３３と出力軸５とが嵌合している部分のそれぞれに螺子
を切り、出力軸を所定回転数回転させたとき、前記出力
軸５が螺子により内歯歯車側へ引き寄せられ、それによ
って内歯歯車と出力軸５のピン３５と５１が衝合するよ
うに構成すれば良い。In order to further increase the rotation angle for retightening with this ratchet mechanism, when the pins make one rotation and re-contact with each other and operate the ratchet mechanism, the pin 51 of the output shaft 5 is connected to the pin installed in the internal gear 33. What is necessary is to reduce the reaction force from 35 and prevent the internal gear 33 from rotating, that is, the planetary gear holding plate 34 from rotating. To do this, the output shaft must be made slidable in the front-rear direction, and a screw must be cut in each of the parts where the internal gear 33 and the output shaft 5 fit together, as shown in FIG. The structure may be such that when the output shaft 5 is rotated several times, the output shaft 5 is drawn toward the internal gear by the screw, so that the internal gear and the pins 35 and 51 of the output shaft 5 abut against each other.
こうすれば必要とする回転数だけ螺子の条数を螺切する
ことによりその回転角度だけ増締めが可能となるもので
ある。In this way, by cutting the number of threads of the screw by the required number of rotations, it becomes possible to tighten the screw by the angle of rotation.
この電動ドライバはネジの被締付部材が鋼か合成樹脂か
木材かなどによって、予めネジの締付トルクを設定出来
るような機構となっている。即ち内歯歯車１３の側面周
囲の数個所に均等に一部球面状の窪みを設けここに球体
６を嵌太し、この球体６はスプリング７と接するプレー
ト８を操作筒９によって適度に付勢する。つまりネジの
締付設定トルクに対応して付勢するような構造となって
いる。そして設定した締付トルクに達すると、締付けら
れたネジの反力が遊星歯車減速機構を通じてこの内歯歯
車１３に達して、内歯歯車１３の側面と球体６との間に
スリップを生じさせるのである。こうしてどのネジも締
付トルクを一定にすることが出来る。This electric screwdriver has a mechanism that allows the screw tightening torque to be set in advance depending on whether the member to be tightened is steel, synthetic resin, or wood. That is, partially spherical depressions are provided evenly at several locations around the side surface of the internal gear 13, and the spheres 6 are fitted therein, and the plates 8 in contact with the springs 7 are appropriately biased by the operation tube 9. do. In other words, the structure is such that the force is applied in accordance with the set tightening torque of the screw. When the set tightening torque is reached, the reaction force of the tightened screw reaches the internal gear 13 through the planetary gear reduction mechanism, causing a slip between the side surface of the internal gear 13 and the sphere 6. be. In this way, the tightening torque can be made constant for all screws.
この発明の実施例の詳細は以上のようであるが。The details of the embodiments of this invention are as above.
図示例のものに限られないのは勿論であり技術的思想と
して同一の範囲で種々変形が可能であることはいうまで
もない。例えば図示例の場合、ラチェット機構は爪６１
が３個としであるが１個以上あれば良い。内歯歯車３３
と出力軸５との結合はピン同志による当接結合としたが
適当な突起同志であればビンでなくても良い。更に、ラ
チェット機構を作動させる方法は手動操作方式によるこ
とも可能である。It goes without saying that the present invention is not limited to the illustrated example, and that various modifications can be made within the same technical concept. For example, in the illustrated example, the ratchet mechanism is the pawl 61
It is assumed that there are three, but one or more is sufficient. Internal gear 33
Although the connection between the output shaft 5 and the output shaft 5 is made by abutting connection using pins, it is not necessary to use a pin as long as the protrusions are connected appropriately. Additionally, the ratchet mechanism can be actuated manually.
また上記実施例では三段階の遊星歯車減速機構を用いて
いるが二段階方式のものあるいは四段階方式以上のもの
にも使用可能である。Furthermore, although the above embodiment uses a three-stage planetary gear reduction mechanism, it is also possible to use a two-stage system, a four-stage system, or more.
発明の効果
以上述べた如く、この発明においては動力の最終出力端
を内歯歯車とし、この内歯歯車とドライバビットを挿着
する出力軸とに互に直交する突起を設け、それぞれの突
起を当接結合させると共に出力軸外周囲に刻設したラチ
ェツト歯と噛合するラチェツト爪とラチェツト爪を付勢
するバネとこのラチェツト歯を回転自楡箇接あるいはう
チェ・ノド爪取付板を介して外ケースに枢着して成るラ
チェット機構を組込んだので、電動ドライバによるネジ
の締付けが終わった後、直ちに電動ドライバを手動のド
ライバとしてネジの増締めが可能となる。このように手
動のドライバとして使用することが出来るようになれば
、ネジの締付は途中までは電動により締付け、最も大き
な締付トルクを必要とする最終締付は工程を手動により
確実に行い作業の能率と確実性を確保し、また電池の節
約を図ることが出来て便利である。。Effects of the Invention As described above, in this invention, the final output end of the power is an internal gear, and the internal gear and the output shaft into which the driver bit is inserted are provided with protrusions perpendicular to each other. The ratchet pawl that engages with the ratchet teeth carved on the outer periphery of the output shaft and the spring that biases the ratchet pawl and the ratchet teeth are connected to each other through a rotating self-edge joint or are removed via a chevron and throat pawl mounting plate. Since a ratchet mechanism which is pivotally connected to the case is incorporated, it is possible to tighten the screws further by using the electric screwdriver as a manual driver immediately after tightening the screws with the electric screwdriver. If it can be used as a manual screwdriver in this way, the screws can be tightened partially by electric power, and the final tightening process, which requires the largest tightening torque, can be done reliably by hand. It is convenient because it ensures efficiency and reliability, and it also saves battery power. .
第１図はこの発明の電動ドリルの遊星歯車減速機構の一
実施例を示す断面図、第２図乃至第４図は第１図のＡ−
Ａ矢視断面図でラチェット機構の作動状態を示したもの
、第５図は遊星歯車保持板にバネを嵌着する場合の斜視
図、第６図は出力軸と内歯歯車との間を螺子結合する場
合の一部断面説明図をそれぞれ示す。
１−・・−・−・外ケース ｌ ａ−−−−−−−−
−−一凹状溝３−・・−・−電動モータ ５−−−−−
−−−−−ドライバビット出力軸 ３２−−−−−−
−・−・遊星歯車３３−−−−−−−−−一内歯歯車
３４・−−−−−−−−・遊星歯車保持板３４ａ−・−
−−−−−−一遊星歯車保持板突起部３５・・・・・−
・−・内歯歯車植設ピン５１・−・−・出力軸植設ピン
６１−−−−−−−・・・ラチェツト爪 ６２−・−
−一−−−−ラチェット歯 ６３・−−−−−・・・
・バネ（板バネ）６４・・・−・・・−ラチェツト爪取
付板第２図
第３図
第４図FIG. 1 is a sectional view showing an embodiment of a planetary gear reduction mechanism for an electric drill according to the present invention, and FIGS. 2 to 4 are A--A in FIG. 1.
A cross-sectional view taken along arrow A shows the operating state of the ratchet mechanism. Figure 5 is a perspective view of the case where the spring is fitted to the planetary gear holding plate. Figure 6 is a diagram showing the operation of the ratchet mechanism between the output shaft and the internal gear. Partial cross-sectional explanatory views in the case of coupling are shown, respectively. １−・・−・−・Outer case l a−−−−−−−
--- One concave groove 3 ---- Electric motor 5 ---
--------Driver bit output shaft 32---------
−・−・Planetary gear 33−−−−−−−−−1 Internal gear 34・−−−−−−・Planetary gear holding plate 34a−・−
------One planetary gear holding plate protrusion 35...-
・−・Internal gear installation pin 51・−・−・Output shaft installation pin 61−−−−−−・Ratchet pawl 62−・−
-1---Ratchet tooth 63・---------
・Spring (plate spring) 64 --- Ratchet pawl mounting plate Figure 2 Figure 3 Figure 4
Claims (1)
動力伝達する電動ドライバにおいて、前記遊星歯車減速
機構の最終出力端としての内歯歯車を出力軸と摺動可能
に配設し、前記内歯歯車と出力軸とに互に直交する突起
を設けて両突起が当接することにより内歯歯車の回転力
を出力軸に伝達する手段と、前記出力軸外周囲に刻設し
たラチェット歯と噛合するラチェット爪と、一定範囲回
動可能な遊星歯車保持板に装着され前記ラチェット爪を
付勢するバネとを備え、前記ラチット爪を回転自在に直
接あるいは間接的に外ケースに枢着して成るラチェット
機構を有することを特徴とする電動ドライバ。In an electric driver that transmits power from an electric motor to an output shaft via a planetary gear reduction mechanism, an internal gear serving as a final output end of the planetary gear reduction mechanism is arranged to be slidable on the output shaft, A means for transmitting the rotational force of the internal gear to the output shaft by providing protrusions perpendicular to each other on the gear and the output shaft so that both protrusions come into contact with each other, and meshing with ratchet teeth carved around the outer circumference of the output shaft. a spring that is attached to a planetary gear holding plate that is rotatable within a certain range and biases the ratchet pawl, and the ratchet pawl is rotatably directly or indirectly pivotally connected to the outer case. An electric screwdriver characterized by having a ratchet mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4704986A JPS62203771A (en) | 1986-03-03 | 1986-03-03 | Electric driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4704986A JPS62203771A (en) | 1986-03-03 | 1986-03-03 | Electric driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62203771A true JPS62203771A (en) | 1987-09-08 |
| JPH0459111B2 JPH0459111B2 (en) | 1992-09-21 |
Family
ID=12764305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4704986A Granted JPS62203771A (en) | 1986-03-03 | 1986-03-03 | Electric driver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62203771A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008275154A (en) * | 2001-01-23 | 2008-11-13 | Black & Decker Inc | First stage clutch |
| JP2019188498A (en) * | 2018-04-20 | 2019-10-31 | 京都機械工具株式会社 | Torque Wrench |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5754081A (en) * | 1980-09-13 | 1982-03-31 | Katsuyuki Totsu | DENDODORAIBAA |
-
1986
- 1986-03-03 JP JP4704986A patent/JPS62203771A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5754081A (en) * | 1980-09-13 | 1982-03-31 | Katsuyuki Totsu | DENDODORAIBAA |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008275154A (en) * | 2001-01-23 | 2008-11-13 | Black & Decker Inc | First stage clutch |
| JP2019188498A (en) * | 2018-04-20 | 2019-10-31 | 京都機械工具株式会社 | Torque Wrench |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0459111B2 (en) | 1992-09-21 |
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