JP2005205569A - Power tool - Google Patents
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- JP2005205569A JP2005205569A JP2004016420A JP2004016420A JP2005205569A JP 2005205569 A JP2005205569 A JP 2005205569A JP 2004016420 A JP2004016420 A JP 2004016420A JP 2004016420 A JP2004016420 A JP 2004016420A JP 2005205569 A JP2005205569 A JP 2005205569A
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Abstract
Description
本発明はドライバドリル等の出力軸の滑りトルクを調節可能な電動工具に関するものである。 The present invention relates to a power tool capable of adjusting a sliding torque of an output shaft such as a driver drill.
従来、この種の電動工具に内蔵されるトルク調整機構は、例えば特開２００２−１３７１７０号公報に開示された構成のものがあった。従来の電動工具の一例を図３を用いて説明する。図３に示すように、モータ１の回転軸に固定されたピニオン２がキャリア３の支持軸３ａに支持されたプラネットギヤ４と噛合し、プラネットギヤ４がギヤケース５に固定されたインターナルギヤ６と噛合している。更にキャリア７にはサンギヤ７ａが形成されており、モータ軸１の動力が減速伝達されて、キャリア７に形成されたサンギヤ７ａに伝達される。サンギヤ７ａは出力軸８の支持軸８ａに支持されたプラネットギヤ９と噛合し、プラネットギヤ９はインターナルギヤ１０と噛合している。このような遊星歯車機構により、モータ１の回転が減速され出力軸８に伝達される。 Conventionally, a torque adjusting mechanism built in this type of electric power tool has a configuration disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-137170. An example of a conventional power tool will be described with reference to FIG. As shown in FIG. 3, the pinion 2 fixed to the rotating shaft of the motor 1 meshes with the planet gear 4 supported by the support shaft 3 a of the carrier 3, and the planet gear 4 is fixed to the gear case 5. Is engaged. Further, a sun gear 7 a is formed on the carrier 7, and the power of the motor shaft 1 is reduced and transmitted to the sun gear 7 a formed on the carrier 7. The sun gear 7 a meshes with the planet gear 9 supported by the support shaft 8 a of the output shaft 8, and the planet gear 9 meshes with the internal gear 10. By such a planetary gear mechanism, the rotation of the motor 1 is decelerated and transmitted to the output shaft 8.
また、インターナルギヤ１０の端面には複数の軸方向に延びる爪１０ａが設けられており、爪１０
ａにはギヤケース１２に保持されたクラッチ部材であるボール１１が係合し、ボール１１はギヤケース１２に対して回転不能及び軸方向に移動可能に設けられたクラッチプレート１３と押圧部材１５とにより挟持されるコイルスプリング１４によりインターナルギヤ１０側に常時付勢されている。
A plurality of axially extending claws 10 a are provided on the end face of the internal gear 10.
The ball 11 which is a clutch member held by the gear case 12 is engaged with a, and the ball 11 is clamped by a clutch plate 13 and a pressing member 15 which are provided so as not to rotate with respect to the gear case 12 and to be movable in the axial direction. The coil spring 14 is constantly biased toward the internal gear 10 side.
押圧部材１５はキャップ１６に回動不能に設けられており、また内壁側にギヤケース１２に設けら
れたねじ部１２ａとねじ嵌合可能なねじ部１５ａを有し、キャップ１６が回動操作されることにより、押圧部材１５はねじ部１２ａにそってコイルスプリング１４の軸方向に移動し、この押圧部材１５の移動によってコイルスプリング１４の圧縮量は調整され、ボール１１への付勢力が変化する。
The pressing member 15 is non-rotatably provided on the cap 16 and has a screw portion 15a that can be screw-fitted with a screw portion 12a provided on the gear case 12 on the inner wall side, and the cap 16 is rotated. As a result, the pressing member 15 moves in the axial direction of the coil spring 14 along the threaded portion 12a, and the amount of compression of the coil spring 14 is adjusted by the movement of the pressing member 15, and the urging force to the ball 11 changes.
インターナルギヤ１０の爪１０ａとボール１１とは、出力軸８に伝わる伝達トルクが増大した場合、爪１０ａがコイルスプリング１４の付勢力に抗してボール１１を軸方向に移動させて係合が解除し、インターナルギヤ１０が回転可能となり出力軸８への回転伝達が解除される。すなわち、コイルスプリング１４の圧縮量を調節することにより出力軸８への伝達トルクが調節されることになる。更に大きな動力を出力軸８に伝達する場合には、押圧部材１５がクラッチプレート１３に当接するまでキャップ１６を回動させ、ボール１１の軸方向の動きを抑止すれば良い。このように設定すると、インターナルギヤ１０の爪１０ａがコイルスプリング１４の付勢力に抗してボール１１を軸方向に移動しようとしても、押圧部材１５によりクラッチプレート１３の軸方向の移動が抑止されているためにボール１１を移動させることができずインターナルギヤ１０が固定される。すなわち、直結モードに設定できる。 When the transmission torque transmitted to the output shaft 8 increases, the claw 10a of the internal gear 10 and the ball 11 are engaged by moving the ball 11 in the axial direction against the urging force of the coil spring 14. The internal gear 10 can be rotated and the rotation transmission to the output shaft 8 is released. That is, the transmission torque to the output shaft 8 is adjusted by adjusting the compression amount of the coil spring 14. In order to transmit a larger amount of power to the output shaft 8, the cap 16 may be rotated until the pressing member 15 contacts the clutch plate 13 to suppress the movement of the ball 11 in the axial direction. With this setting, even when the claw 10a of the internal gear 10 attempts to move the ball 11 in the axial direction against the urging force of the coil spring 14, the pressing member 15 prevents the clutch plate 13 from moving in the axial direction. Therefore, the ball 11 cannot be moved and the internal gear 10 is fixed. That is, the direct connection mode can be set.
なお、図示しないが上記電動工具にはキャップ１６の外力による回動操作は許容する程度にキャッ
プ１６をロックするようにした手段、例えばキャップ１６に凹部、ギヤケース１２にキャップ１６の凹部と係合する凸部を有する板ばね等が設けられている。
Although not shown in the drawings, the power tool is configured to lock the cap 16 to such an extent that the turning operation by the external force of the cap 16 is allowed. For example, the cap 16 is engaged with the recess and the gear case 12 is engaged with the recess of the cap 16. A leaf spring or the like having a convex portion is provided.
上記ドリルモード状態において、大きな負荷トルクが何度も加わる状態が繰り返されると、ボール１１に加わる力により貫通穴１２ｂがインターナルギヤ１０の回転方向に押し広げられて穴径が徐々に大きくなってしまうことがある。このとき、上記のように一つの貫通穴に対してボールを２個重ねた構造だと、それぞれのボールの中心が貫通穴１２ｂの中心軸からずれることにより両ボール間の軸方向の寸法が減少してしまい、爪１０ａとボール１１との係合が外れてインターナルギヤ１０が回転してしまう場合があった。 In the drill mode state, when a state where a large load torque is repeatedly applied is repeated, the force applied to the ball 11 causes the through hole 12b to be expanded in the rotational direction of the internal gear 10, and the hole diameter gradually increases. It may end up. At this time, if two balls are stacked on one through hole as described above, the axial dimension between the two balls is reduced because the center of each ball is displaced from the central axis of the through hole 12b. As a result, the claw 10a and the ball 11 are disengaged and the internal gear 10 may rotate.
これを解消するために、貫通穴１２ｂ内にボールを２個収納する代りに、爪１０ａと係合可能なボール１１及びボール１１とクラッチプレート１３の間に軸方向の寸法を確保する目的で円筒形状のスペーサを収納することがある。この場合、ボール１１に加わる力により貫通穴１２ｂが押し広げられてボール１１の中心とスペーサの中心が貫通穴１２ｂの中心軸からずれてもボールとスペーサ間の軸方向の寸法が減少することはないが、大きな負荷トルクが何度も加わる状態が繰り返されると、ボール１１とスペーサとの接触が点接触であるためボール１１に加わる力によりスペーサの接触部がつぶれて、やはりボールとスペーサ間の軸方向の寸法が減少してインターナルギヤ１０が回転してしまう場合があった。 In order to solve this problem, instead of storing two balls in the through hole 12b, the ball 11 that can be engaged with the claw 10a and the cylinder for the purpose of securing the axial dimension between the ball 11 and the clutch plate 13 are used. Shaped spacers may be stored. In this case, the axial dimension between the ball and the spacer is reduced even if the through hole 12b is expanded by the force applied to the ball 11 and the center of the ball 11 and the center of the spacer are deviated from the central axis of the through hole 12b. However, if a state in which a large load torque is applied many times is repeated, the contact between the ball 11 and the spacer is a point contact, so the contact portion of the spacer is crushed by the force applied to the ball 11, and again between the ball and the spacer In some cases, the axial dimension is reduced and the internal gear 10 rotates.
本発明は、上述のような実状に鑑みてなされたもので、その目的とすることろは、ドリルモード時の機能不全を生じにくい電動工具を提供することである。 The present invention has been made in view of the above-described actual situation, and an object of the present invention is to provide an electric tool which is less likely to malfunction during a drill mode.
駆動源であるモータと、該モータへの電力の供給を制御するスイッチと、前記モータ及び前記スイッチを収容するハウジングと、前記モータの前方に設けられ且つ前記モータの回転力を伝達する遊星歯車機構部と、該遊星歯車機構部から前記モータの回転力が伝達される出力軸と、前記遊星歯車機構部及び前記出力軸を収容するギヤケースと、前記遊星歯車機構部の一部であって前記ギヤケースに回転可能に支持されるインターナルギヤと、該インターナルギヤの前面から前方に突出する複数の爪と、前記ギヤケースの前記爪と対向する位置に前後方向に貫通して設けられる貫通穴と、該貫通穴内に設けられ且つ前後方向に移動して前記爪との係合・離脱を選択可能なクラッチ部材と、該クラッチ部材を前記爪方向へ押圧するスプリングと、該スプリングの前端と当接し且つ前記ギヤケースに対して前後方向に移動可能に設けられた押圧部材と、前記ハウジングの前方に回動可能に設けられ且つ回動することにより前記押圧部材を前後方向に移動させるキャップとを有する電動工具において、前記クラッチ部材は、前記貫通穴の前記インターナルギヤ側に挿入されるボールと、前記ボールと前記スプリングとの間に挿入される略円柱形状のスペーサとからなり、該スペーサの前記ボールと当接する面に前記ボールの半径と同程度の曲率半径で凹設された曲面部を設けることによって、前記ボールと前記スペーサとの接触面積を大きくすることができる。 A motor that is a drive source, a switch that controls supply of electric power to the motor, a housing that houses the motor and the switch, and a planetary gear mechanism that is provided in front of the motor and transmits the rotational force of the motor , An output shaft to which the rotational force of the motor is transmitted from the planetary gear mechanism, a gear case that houses the planetary gear mechanism and the output shaft, and a part of the planetary gear mechanism that is the gear case An internal gear that is rotatably supported, a plurality of claws protruding forward from the front surface of the internal gear, and a through hole provided in a front-rear direction at a position facing the claw of the gear case; A clutch member provided in the through-hole and capable of selecting engagement and disengagement with the claw by moving in the front-rear direction; and a spring for pressing the clutch member in the claw direction; A pressing member that is in contact with the front end of the spring and that is movable in the front-rear direction with respect to the gear case, and that is provided in a rotatable manner in the front of the housing and is moved in the front-rear direction by rotating. In the electric tool having a cap to be operated, the clutch member includes a ball inserted into the through-hole on the internal gear side, and a substantially cylindrical spacer inserted between the ball and the spring. The contact area between the ball and the spacer can be increased by providing a curved surface portion with a curvature radius similar to the radius of the ball on the surface of the spacer that contacts the ball.
さらに、前記曲面部を前記スペーサの前面及び後面に対象に設けることによって、前記スペーサは前後の方向を変えても機能することができる。 Furthermore, by providing the curved surface portion as a target on the front and rear surfaces of the spacer, the spacer can function even when the front-rear direction is changed.
請求項１記載の構成によれば、ボールとスペーサとの接触面積が大きくなり、ボールとスペーサとの接触面における面圧を小さくすることができる。よって、ボール又はスペーサが接触面でつぶれたり摩耗したりすることがなくなり、ボールとスペーサとで形成される軸方向の寸法が減少することがなくなるので、ドリルモード時にインターナルギヤの回転を確実に規制することができる。 According to the configuration of the first aspect, the contact area between the ball and the spacer is increased, and the surface pressure at the contact surface between the ball and the spacer can be reduced. Therefore, the ball or spacer will not be crushed or worn on the contact surface, and the axial dimension formed by the ball and spacer will not decrease. Can be regulated.
請求項２記載の構成によれば、スペーサは前後の方向を変えても機能するので、前後方向を区別することなく組み立てることができるようになり、組立性が向上する。 According to the second aspect of the present invention, since the spacer functions even when the front and rear directions are changed, the spacer can be assembled without distinguishing the front and rear directions, and the assemblability is improved.
本発明による電動工具の実施の形態を図１及び図２を用いて説明する。図１は本発明による実施の形態のトルク調整機構を示す要部拡大断面図、図２は本発明による実施の形態の電動工具の外観を示す全体斜視図、図３は従来のトルク調整機構を示す要部拡大断面図である。 An embodiment of a power tool according to the present invention will be described with reference to FIGS. FIG. 1 is an enlarged cross-sectional view showing a main part of a torque adjusting mechanism according to an embodiment of the present invention, FIG. 2 is an overall perspective view showing an appearance of an electric power tool according to an embodiment of the present invention, and FIG. 3 shows a conventional torque adjusting mechanism. It is a principal part expanded sectional view shown.
図２に示す電動工具は、図示しないモータを収納するモータハウジング部１８と、モータの駆動を制御するスイッチ１９が設けられたハンドル部２０とを有する構成をしており、ハンドル部２０の下部には駆動源である電池２１を着脱可能に保持する構成をしている。モータハウジング部１８の前方には図示しないモータとほぼ同軸上に設けられ、モータの回転動力を受けて回転する先端工具を着脱可能な工具保持部２２が設けられており、この工具保持部２２とモータとの間には図１に示すトルク調整機構が設けられている。このトルク調整機構の構成は、前記従来例で示したものと同じであることから、スペーサ１７についてのみ説明する。 The electric tool shown in FIG. 2 includes a motor housing portion 18 that houses a motor (not shown), and a handle portion 20 that is provided with a switch 19 that controls driving of the motor. Is configured to detachably hold a battery 21 as a drive source. In front of the motor housing portion 18, there is provided a tool holding portion 22 that is provided substantially coaxially with a motor (not shown) and that can be attached to and detached from a tip tool that rotates by receiving the rotational power of the motor. A torque adjusting mechanism shown in FIG. 1 is provided between the motor and the motor. Since the configuration of the torque adjusting mechanism is the same as that shown in the conventional example, only the spacer 17 will be described.
ここで用いるスペーサ１７は、従来例と同じようにギヤケース１２の大径部分内部に設けられた貫通穴１２ｂ内に、ボール１１及びクラッチプレート１３に当接してかつギヤケース１２の軸方向に移動可能に収納されているが、スペーサ１７のボール１１との当接面には、ボール１１の半径と同程度の曲率半径を持つ曲面１７ａが凹設されており、ボール１１とスペーサ１７との接触はほぼ面接触となっている。 The spacer 17 used here is in contact with the ball 11 and the clutch plate 13 and is movable in the axial direction of the gear case 12 in a through hole 12b provided in the large diameter portion of the gear case 12 as in the conventional example. The curved surface 17 a having a radius of curvature similar to the radius of the ball 11 is recessed on the contact surface of the spacer 17 with the ball 11, so that the contact between the ball 11 and the spacer 17 is approximately. Surface contact.
このため、前記従来例で示したドリルモード状態において、大きな負荷トルクが何度も加わる状態が繰り返されても、ボール１１とスペーサ１７との接触面が大きくなっているためボール１１からスペーサ１７に加わる面圧が緩和され、ボール１１の接触部がつぶれにくくなっている。したがって、ボールとスペーサ間の軸方向の寸法が減少してインターナルギヤ１０が回転してしまうことが起こりくい。さらに、曲面１７ａをボール１１との当接面と反対側、すなわちクラッチプレート１３との当接面にも設けてあるので、スペーサ１７に方向性がなくなり、トルク調整機構組立時の組立性を悪化させることがない。 For this reason, in the drill mode state shown in the conventional example, even if a state where a large load torque is repeatedly applied is repeated, the contact surface between the ball 11 and the spacer 17 is large, so that the ball 11 changes to the spacer 17. The applied surface pressure is relaxed, and the contact portion of the ball 11 is not easily crushed. Therefore, it is difficult for the internal gear 10 to rotate due to a decrease in the axial dimension between the ball and the spacer. Further, since the curved surface 17a is also provided on the side opposite to the contact surface with the ball 11, that is, the contact surface with the clutch plate 13, the spacer 17 has no directionality, and the assemblability at the time of assembling the torque adjusting mechanism is deteriorated. I will not let you.
１はモータ、２はピニオン、３はキャリア、３ａはサンギヤ、３ｂは支持軸、４はプラネットギヤ、５はギヤケース、６はインターナルギヤ、７はキャリア、７ａはサンギヤ、８は出力軸、８ａは支持軸、９はプラネットギヤ、１０はインターナルギヤ、１０ａは爪、１１はボール、１２はギヤケース、１２ａはおねじ、１２ｂは貫通穴、１３はクラッチプレート、１４はコイルスプリング、１４ａ、１４ｂはコイルスプリングの一端、１５は押圧部材、１５ａはめねじ、１５ｂは押圧部材の一部、１６はキャップ、１７はスペーサ、１７ａは曲面、１８はモータハウジング部、１９はスイッチ、２０はハンドル部、２１は電池、２２は工具保持部である。
1 is motor, 2 is pinion, 3 is carrier, 3a is sun gear, 3b is support shaft, 4 is planet gear, 5 is gear case, 6 is internal gear, 7 is carrier, 7a is sun gear, 8 is output shaft, 8a Is a support shaft, 9 is a planet gear, 10 is an internal gear, 10a is a claw, 11 is a ball, 12 is a gear case, 12a is a male screw, 12b is a through hole, 13 is a clutch plate, 14 is a coil spring, 14a and 14b are One end of the coil spring, 15 is a pressing member, 15a female screw, 15b is a part of the pressing member, 16 is a cap, 17 is a spacer, 17a is a curved surface, 18 is a motor housing part, 19 is a switch, 20 is a handle part, 21 Is a battery, and 22 is a tool holder.
Claims (2)
前記クラッチ部材は、前記貫通穴の前記インターナルギヤ側に挿入されるボールと、前記ボールと前記スプリングとの間に挿入される略円柱形状のスペーサとからなり、該スペーサの前記ボールと当接する面に前記ボールの半径と同程度の曲率半径で凹設された曲面部を設けることを特徴とする電動工具。 A motor that is a drive source, a switch that controls supply of electric power to the motor, a housing that houses the motor and the switch, and a planetary gear mechanism that is provided in front of the motor and transmits the rotational force of the motor , An output shaft to which the rotational force of the motor is transmitted from the planetary gear mechanism, a gear case that houses the planetary gear mechanism and the output shaft, and a part of the planetary gear mechanism that is the gear case An internal gear that is rotatably supported, a plurality of claws protruding forward from the front surface of the internal gear, and a through hole provided in a front-rear direction at a position facing the claw of the gear case, A clutch member provided in the through-hole and capable of selecting engagement and disengagement with the claw by moving in the front-rear direction; and a spring for pressing the clutch member in the claw direction; A pressing member that is in contact with the front end of the spring and that is movable in the front-rear direction with respect to the gear case, and that is provided in a rotatable manner in the front of the housing and is moved in the front-rear direction by rotating. In an electric tool having a cap to be
The clutch member includes a ball inserted on the internal gear side of the through hole, and a substantially cylindrical spacer inserted between the ball and the spring, and contacts the ball of the spacer. A power tool, characterized in that a curved surface portion having a curvature radius similar to the radius of the ball is provided on a surface.
The electric tool according to claim 1, wherein the curved portion is provided on a front surface and a rear surface of the spacer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004016420A JP4366688B2 (en) | 2004-01-26 | 2004-01-26 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004016420A JP4366688B2 (en) | 2004-01-26 | 2004-01-26 | Electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005205569A true JP2005205569A (en) | 2005-08-04 |
| JP4366688B2 JP4366688B2 (en) | 2009-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004016420A Expired - Fee Related JP4366688B2 (en) | 2004-01-26 | 2004-01-26 | Electric tool |
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| Country | Link |
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| JP (1) | JP4366688B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009285814A (en) * | 2008-05-30 | 2009-12-10 | Hitachi Koki Co Ltd | Electric power tool |
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2004
- 2004-01-26 JP JP2004016420A patent/JP4366688B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009285814A (en) * | 2008-05-30 | 2009-12-10 | Hitachi Koki Co Ltd | Electric power tool |
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| Publication number | Publication date |
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| JP4366688B2 (en) | 2009-11-18 |
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