JPS6243734Y2 - - Google Patents
Info
- Publication number
- JPS6243734Y2 JPS6243734Y2 JP20175282U JP20175282U JPS6243734Y2 JP S6243734 Y2 JPS6243734 Y2 JP S6243734Y2 JP 20175282 U JP20175282 U JP 20175282U JP 20175282 U JP20175282 U JP 20175282U JP S6243734 Y2 JPS6243734 Y2 JP S6243734Y2
- Authority
- JP
- Japan
- Prior art keywords
- clutch
- motor
- cam
- fixed cam
- shaft
- 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.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 210000000078 claw Anatomy 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Landscapes
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Description
【考案の詳細な説明】
本考案はクラツチ式締付工具のクラツチの構造
に関するものである。[Detailed Description of the Invention] The present invention relates to the structure of a clutch of a clutch-type tightening tool.
従来より多くのクラツチ式締付工具が市販され
ているがそれらは
1所定の締付トルクに達するとクラツチが離脱
するがモートルは回転を続けクラツチの係合離脱
を繰返す、2所定の締付トルクに達するとクラツ
チが離脱すると供にモートルへの電力供給をシヤ
断するがモートルは慣性で回転し、しばらくの間
クラツチの係合離脱を繰返す、3所定の締付トル
クに達するとクラツチが離脱しモートルへの電力
供給をシヤ断するがモートルは慣性で回転を続け
るから上記クラツチ以外にモートルの動力伝達を
シヤ断する装置を具備する。等である。しかし上
記1,2の締付工具はクラツチが係合離脱を繰返
す時そのインパクトにより締結物(例えばネジ)
の締付力が増加し、正確なトルク管理ができな
い。3はクラツチ以外にモートルの動力シヤ断装
置が必要であり構造が複雑になる等の欠点を有し
ていた。 Many clutch-type tightening tools have been commercially available in the past, but they are: 1) When a predetermined tightening torque is reached, the clutch disengages, but the motor continues to rotate, and the clutch engages and disengages repeatedly; 2) The clutch disengages when a predetermined tightening torque is reached; When the torque reaches the specified tightening torque, the clutch disengages and the power supply to the motor is cut off, but the motor rotates due to inertia, and the clutch engages and disengages repeatedly for a while.3 When the specified tightening torque is reached, the clutch disengages. Although the power supply to the motor is cut off, since the motor continues to rotate due to inertia, a device other than the above-mentioned clutch is provided to cut off power transmission to the motor. etc. However, when the clutch repeatedly engages and disengages, the tightening tools 1 and 2 above cause the impact on the fastened object (e.g. screw).
The tightening force increases, making accurate torque management impossible. 3 required a power shearing device for the motor in addition to the clutch, and had the disadvantage that the structure was complicated.
本考案の目的は、上記した従来技術の欠点をな
くし、簡便かつ確実な締付トルクの制御ができ
る。クラツチ式締付工具を提供することにある。 An object of the present invention is to eliminate the drawbacks of the prior art described above and to enable simple and reliable control of tightening torque. An object of the present invention is to provide a clutch type tightening tool.
本考案は噛合いクラツチの離脱後、再係合する
までの間にモートルの回転を停止させればモート
ルの慣性による締付トルク増加分を除去できるこ
とに着目し、モートルの制動特性と噛合いクラツ
チの爪の構造を工夫したものである。 This invention focuses on the fact that the increase in tightening torque due to the inertia of the motor can be removed by stopping the rotation of the motor after the dog clutch is disengaged and before it is re-engaged. The structure of the nail is devised.
本考案の一実施例を第1図乃至第4図に示す。 An embodiment of the present invention is shown in FIGS. 1 to 4.
第1図乃至第3図において1はモートル、2は
遊星歯車機構の減速装置である。3は固定カムで
あり遊星歯車機構2のセカンドアイドルギヤ2a
を支持している。固定カム3には中心線上に回転
半径の異なる噛合い爪3a及び3bが設けられて
いる。4はシヤフトであり、一端にはドライバビ
ツト5を保持するソケツト6をピンク、止メネジ
8により接続支承し、他の一端には回転板9と2
個の鋼球10より成る可動カム11が鋼球12に
より軸方向に摺動自在にかつ一体回転するよう取
りつけられている。鋼球10は回転板9の中心線
上に回転半径を異にして埋込まれており、締付力
調整用のスプリング13の押圧力によりスリーブ
14、ロツド15を介し前記固定カム3に圧着さ
れ噛合されている。16は上記の各部品を収納す
るギヤカバである。17はリミツトスイツチで、
ギヤカバ16に固定されており、可動カム11の
変位に対応し、スリーブ14により入、切の切換
が行なわれる。 In FIGS. 1 to 3, 1 is a motor, and 2 is a speed reduction device of a planetary gear mechanism. 3 is a fixed cam, which is the second idle gear 2a of the planetary gear mechanism 2.
is supported. The fixed cam 3 is provided with engaging pawls 3a and 3b having different rotation radii on the center line. 4 is a shaft, at one end of which a socket 6 for holding a driver bit 5 is connected and supported by a pink set screw 8, and at the other end a rotary plate 9 and 2 are connected.
A movable cam 11 consisting of two steel balls 10 is attached to a steel ball 12 so as to be slidable in the axial direction and to rotate together with the steel balls 12. The steel balls 10 are embedded on the center line of the rotary plate 9 with different rotation radii, and are pressed against the fixed cam 3 through the sleeve 14 and the rod 15 by the pressing force of the spring 13 for adjusting the tightening force, and are engaged with the fixed cam 3. has been done. 16 is a gear cover that houses each of the above-mentioned parts. 17 is a limit switch,
It is fixed to the gear cover 16, and is switched on and off by the sleeve 14 in response to the displacement of the movable cam 11.
第4図により電気回路の構成を説明する。20
は直流電源、21はモートル1を起動する操作ス
イツチ、22はモートル1の回転方向を切換える
正逆切換スイツチを示す。23はNPNトランジ
スタであり操作スイツチ21を投入すると抵抗2
4によりベースが附勢されているため導通状態と
なりモートル1へ電力を供給する。25はサイリ
スタでリミツトスイツチ17が投入されると抵抗
26を介しゲートが附熱され導通状態となり
NPNトランジスタ27のベースを抵抗28,2
9を介し附勢しNPNトランジスタ27を導通状
態にすると共にサイリスタ30のゲートを附勢し
サイリスタ30を転孤させる。 The configuration of the electric circuit will be explained with reference to FIG. 20
21 is an operation switch for starting the motor 1, and 22 is a forward/reverse changeover switch for switching the direction of rotation of the motor 1. 23 is an NPN transistor, and when the operation switch 21 is turned on, the resistor 2
Since the base is energized by 4, it becomes conductive and supplies power to the motor 1. 25 is a thyristor, and when the limit switch 17 is turned on, the gate is heated through the resistor 26 and becomes conductive.
The base of the NPN transistor 27 is connected to the resistor 28,2
9 to turn on the NPN transistor 27 and energize the gate of the thyristor 30 to turn the thyristor 30 off.
NPNトランジスタ27が導通状態になると
NPNトランジスタ23のベースエミツタ間が短
絡され、NPNトランジスタ23はシヤ断状態と
なりモートル1への電力供給が停止する。一方サ
イリスタ30は転孤してモートル1を抵抗31を
介し短絡するためモートル1に発電制動がかか
る。 When the NPN transistor 27 becomes conductive,
The base and emitter of the NPN transistor 23 are short-circuited, and the NPN transistor 23 is brought into a shut-off state, and power supply to the motor 1 is stopped. On the other hand, the thyristor 30 rolls and short-circuits the motor 1 via the resistor 31, so that dynamic braking is applied to the motor 1.
次に締付作業時の各部の動作について説明す
る。第1図においてモートル1の回転力は遊星歯
車機構2により減速され、固定カム3の噛合い爪
3a,3bと可動カム11の2個の鋼球10の噛
合により回転板9、シヤフト4、ソケツト6を介
しドライバビツト5に伝達されネジ等(図示せ
ず)を締付ける。ネジの締付けが進み、スプリン
グ13の押圧力や噛合い爪3a,3bの角度と回
転半径及び摩擦角によつて決定される所定の締付
トルクに達すると鋼球10は噛合い爪3a,3b
により押し出され噛合いクラツチが離脱状態とな
りモートル1の回転力伝達がシヤ断される。一方
スリーブ14もロツド15を介しスプリング13
側に押し出されるからリミツトスイツチ17が作
動しサイリスタ25を転孤しモートル1への電力
供給をシヤ断し、発電制動によりモートル1を停
止させネジ等の締付が終了する。この状態は操作
スイツチ21をシヤ断するまで保持される。(第
4図参照)ここで固定カム3の噛合爪3aと3
b、同じく可動カム11の2個の鋼球10は、回
転半径が異なるため、離脱後固定カム3が約1回
転(360゜)回転するまで再係合することがな
い。モートル1の制動時間すなわち噛合い離脱後
の固定カム3の回転角はモートル1の慣性モーメ
ント、減速装置の減速比及び発電制動回路の抵抗
値で決定されるからモートルの制動能力に応じ固
定カムが1回転以内に停止するよう抵抗31を選
択すればクラツチ離脱後再係合することなくネジ
締付を行うことができる。 Next, the operation of each part during tightening work will be explained. In FIG. 1, the rotational force of the motor 1 is reduced by the planetary gear mechanism 2, and the engagement of the two steel balls 10 of the movable cam 11 with the engagement pawls 3a, 3b of the fixed cam 3 causes the rotating plate 9, shaft 4, and socket to be rotated. The signal is transmitted to the driver bit 5 via the screwdriver bit 6 and tightens a screw or the like (not shown). As the screw continues to be tightened and reaches a predetermined tightening torque determined by the pressing force of the spring 13, the angle of the engaging claws 3a, 3b, the radius of rotation, and the friction angle, the steel ball 10 tightens the engaging claws 3a, 3b.
The clutch is pushed out, and the dog clutch is disengaged, and the rotational force transmission of the motor 1 is sheared off. On the other hand, the sleeve 14 also connects the spring 13 through the rod 15.
Since the motor 1 is pushed out to the side, the limit switch 17 is activated, the thyristor 25 is turned off, and the power supply to the motor 1 is cut off.The motor 1 is stopped by dynamic braking, and the tightening of the screws, etc. is completed. This state is maintained until the operating switch 21 is turned off. (See Figure 4) Here, the engaging claws 3a and 3 of the fixed cam 3
b. Similarly, since the two steel balls 10 of the movable cam 11 have different rotation radii, they do not engage again until the fixed cam 3 has rotated about one rotation (360 degrees) after disengagement. The braking time of the motor 1, that is, the rotation angle of the fixed cam 3 after disengagement, is determined by the moment of inertia of the motor 1, the reduction ratio of the reduction gear, and the resistance value of the dynamic braking circuit. If the resistor 31 is selected so as to stop within one rotation, the screw can be tightened without re-engaging after the clutch is disengaged.
第5図に示すごとく、クラツチ離脱時におい
て、可動カム11の2個の鋼球10の回転半径を
それぞれR1、R2(R1>R2)、固定カムの爪3a,
3bの角度をα、βとすれば、可動カム11と固
定カムの相対的な回転角θに対し軸方向の変位X
の値はそれぞれ
X=R1・θtanα,R2・θ・tanβとなるから
R1tanα=R2tanβとなるように固定カムの爪3
a,3bの角度及び鋼球10の回転半径を決定す
れば二対の噛合い部のバランスが保たれ、可動カ
ム11の軸方向の摺動が滑らかになり締付トルク
制御の繰返し精度が向上する。 As shown in FIG. 5, when the clutch is disengaged, the rotation radii of the two steel balls 10 of the movable cam 11 are R 1 and R 2 (R 1 > R 2 ), the pawl 3a of the fixed cam,
If the angles of 3b are α and β, then the axial displacement X with respect to the relative rotation angle θ between the movable cam 11 and the fixed cam
The values of are X=R 1・θtanα and R 2・θ・tanβ, respectively.
Fixed cam pawl 3 so that R 1 tan α = R 2 tan β
By determining the angles of a and 3b and the rotation radius of the steel ball 10, the balance between the two pairs of meshing parts is maintained, the sliding of the movable cam 11 in the axial direction becomes smooth, and the repeatability of tightening torque control is improved. do.
以上のように本考案によれば、噛合いクラツチ
離脱後再度クラツチが係合する前にモートルの回
転を停止することができるので、確実に締付トル
クを制御することができる。 As described above, according to the present invention, since the rotation of the motor can be stopped after the dog clutch is disengaged and before the clutch is re-engaged, the tightening torque can be reliably controlled.
第1図は本考案になるクラツチ式締付工具の一
実施例を示す工具の要部でその縦断側面図を示
す。第2図は第1図の−線断面図である。第
3図は第1図に示す実施例の締付工具において、
固定カムと可動カムの噛合いが離脱した状態を示
す縦断側面図である。第4図は本考案になるクラ
ツチ式締付工具の電気回路の一実施例を示す。第
5図に応用変形例によるクラツチ部の展開図を示
す。
1……モートル、3……固定カム、3a,3b
……噛合い爪、4……シヤフト(出力軸)、5…
…ドライバビツト(先端工具)、11……可動カ
ム、13……スプリング。
FIG. 1 shows a longitudinal sectional side view of the essential parts of an embodiment of the clutch-type tightening tool according to the present invention. FIG. 2 is a sectional view taken along the line -- in FIG. 1. FIG. 3 shows the tightening tool of the embodiment shown in FIG.
FIG. 3 is a longitudinal side view showing a state in which the fixed cam and the movable cam are disengaged from each other. FIG. 4 shows an embodiment of the electric circuit of the clutch type tightening tool according to the present invention. FIG. 5 shows a developed view of a clutch portion according to an applied modification. 1... Motor, 3... Fixed cam, 3a, 3b
...Interlocking pawl, 4...Shaft (output shaft), 5...
...Driver bit (tip tool), 11...Movable cam, 13...Spring.
Claims (1)
有し、モートル出力軸に該出力軸と一体回転する
よう固定カムを取付け、先端工具を接続支承した
シヤフト後端にはシヤフト軸方向に沿つて摺動自
在にかつ該シヤフトと一体回転するように可動カ
ムを取りつけ該可動カムは押圧力調整自在なスプ
リングにより前記固定カムに圧着し噛合せ、更に
先端工具に前記スプリングの設定押圧力より大き
な負荷が作用した時、噛合いクラツチを離脱さ
せ、クラツチの離脱を検出して作動する停止信号
発生スイツチを設け、該停止信号によりモートル
への電力供給をシヤ断しモートルに制動をかける
電気回路を有する締付工具において、前記噛合い
クラツチが、回転軌道の異なる複数の噛合い爪を
有することを特徴とするクラツチ式締付工具。 It has a meshing clutch consisting of a fixed cam and a movable cam, and the fixed cam is attached to the motor output shaft so that it rotates integrally with the output shaft, and the rear end of the shaft that connects and supports the tip tool slides along the shaft axis direction. A movable cam is attached so as to rotate freely and integrally with the shaft, and the movable cam is crimped and engaged with the fixed cam by a spring whose pressing force can be adjusted, and a load greater than the set pressing force of the spring is applied to the tip tool. When the clutch is released, the dog clutch is disengaged, and a stop signal generating switch is provided that operates upon detecting the disengagement of the clutch, and the stop signal is used to cut off the power supply to the motor and apply braking to the motor. A clutch-type tightening tool characterized in that the meshing clutch has a plurality of meshing pawls having different rotational orbits.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20175282U JPS59105375U (en) | 1982-12-29 | 1982-12-29 | Clutch type tightening tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20175282U JPS59105375U (en) | 1982-12-29 | 1982-12-29 | Clutch type tightening tool |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59105375U JPS59105375U (en) | 1984-07-16 |
JPS6243734Y2 true JPS6243734Y2 (en) | 1987-11-14 |
Family
ID=30427241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20175282U Granted JPS59105375U (en) | 1982-12-29 | 1982-12-29 | Clutch type tightening tool |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59105375U (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0437729Y2 (en) * | 1985-03-23 | 1992-09-04 | ||
JP2012130989A (en) * | 2010-12-21 | 2012-07-12 | Hitachi Koki Co Ltd | Rotary tool |
JP5905612B2 (en) * | 2015-01-20 | 2016-04-20 | ローランドディー.ジー.株式会社 | Torque screwdriver |
JP7220304B2 (en) * | 2019-10-28 | 2023-02-09 | 日東工器株式会社 | Clutch mechanism and power tools |
-
1982
- 1982-12-29 JP JP20175282U patent/JPS59105375U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS59105375U (en) | 1984-07-16 |
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