JPH0488242A - Normal/reverse revolution torque limiter - Google Patents
Normal/reverse revolution torque limiterInfo
- Publication number
- JPH0488242A JPH0488242A JP20484590A JP20484590A JPH0488242A JP H0488242 A JPH0488242 A JP H0488242A JP 20484590 A JP20484590 A JP 20484590A JP 20484590 A JP20484590 A JP 20484590A JP H0488242 A JPH0488242 A JP H0488242A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- coil spring
- spring
- torque
- spring sleeve
- 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
- 238000004804 winding Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000013459 approach Methods 0.000 abstract description 2
- 210000000078 claw Anatomy 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
- F16D7/022—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with a helical band or equivalent member co-operating with a cylindrical torque limiting coupling surface
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は正回転時と逆回転時のトルクを異ならせたト
ルクリミッタに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a torque limiter that provides different torques during forward rotation and reverse rotation.
ハウジングにヒンジを介して蓋を取付けた各種の機器（
例えばコピー機、ワープロ、パソコンなど）においては
、蓋を開放する場合は小さいトルクで開放できること、
開放した蓋を任意の開放角度に保持できることが要求さ
れる。Various devices with lids attached to housings via hinges (
For example, when opening the lid of a copy machine, word processor, personal computer, etc., it must be possible to open it with a small torque.
It is required that the opened lid can be held at any opening angle.
このため、従来からダンパーやリンク機構をハウジング
と蓋との間に設ける方法がとられている。For this reason, conventional methods have been used to provide a damper or a link mechanism between the housing and the lid.
しかし、この方法はスペースをとると共に、コスト高に
なる欠点がある。However, this method has the drawback of being space consuming and expensive.
一方、上述の要求に応えるため、第７図のように、断面
角形の線材からなるコイルバネ２１を入力軸２２と固定
軸２３の間に設け、コイルバネ２１の一端に形成したブ
レーキ用爪２４を固定軸２３に係合せしめ、他端に制御
爪２５を設けたブレーキ装置を用いることが考えられる
。On the other hand, in order to meet the above-mentioned requirements, as shown in FIG. 7, a coil spring 21 made of a wire rod with a rectangular cross section is provided between the input shaft 22 and the fixed shaft 23, and a brake pawl 24 formed at one end of the coil spring 21 is fixed. It is conceivable to use a brake device that engages with the shaft 23 and has a control pawl 25 at the other end.
上記のブレーキ装置は、制御爪２５にコイルバネ２１が
戻る方向（拡径方向）に力を加えておくことにより入力
軸２２を自由に回転できるようにし、入力軸２２を停止
させる場合は、制御爪２５に加える力を解除することに
より、コイルバネ２１自身の弾力により入力軸２２を締
め付けてブレーキをかけるようにするものである。The above-mentioned brake device enables the input shaft 22 to rotate freely by applying force to the control claw 25 in the direction in which the coil spring 21 returns (diameter expansion direction), and when stopping the input shaft 22, the control claw By releasing the force applied to the coil spring 25, the elasticity of the coil spring 21 itself tightens the input shaft 22 and applies the brake.
上記のごときブレーキ装置を蓋の開閉機構に採用すると
、蓋を開放する際は問題がないが、閉める際に制御用爪
２５を操作する必要があり、またコイルバネ２１の締付
力が大きすぎると蓋が閉りにくくなる。従って、上記の
装置を蓋の開閉機構にそのま一転用することには問題が
ある。If the above-mentioned brake device is adopted for the lid opening/closing mechanism, there will be no problem when opening the lid, but it will be necessary to operate the control pawl 25 when closing it, and if the tightening force of the coil spring 21 is too large. The lid becomes difficult to close. Therefore, there is a problem in directly using the above-mentioned device as a lid opening/closing mechanism.
そこで、この発明は、上記のブレーキ装置が低コストで
あるという利点をいかしつつ、これを改良して蓋を開放
する際には小さいトルクで開放でき、蓋を任意の開放角
度に保持でき、またその蓋に若干の力を加えることでス
ムーズに閉めることができる程度のブレーキトルクを発
揮できるようにすることを技術的課題とする。Therefore, the present invention takes advantage of the low cost of the above-mentioned brake device, improves the brake device, allows the lid to be opened with a small torque, holds the lid at any opening angle, and improves the brake device. The technical challenge is to be able to exert enough brake torque to close the lid smoothly by applying a slight force to the lid.
上記の課題を解決すたるめに、この発明はベースに固定
した支持軸にトルク入力部材を回転自在に取付け、縮径
すると拡径方向の弾力を発揮するバネスリーブを上記の
支持軸のまわりに嵌めると共にそのバネスリーブの一端
をトルク入力部材に結合し、上記支持軸のまわりにバネ
スリーブの自然状態の径と同径のトルク受け部材を嵌め
これをベースに固定し、上記のスリーブとトルク受け部
の両者の外周面にわたり、自然状態でこれらの外径より
小さい内径を有し、かつトルク入力部材の正回転方向と
逆向きに巻かれたコイルバネを自然状態の径より拡大し
た径で巻き付けた構成としたものである。In order to solve the above problems, the present invention rotatably attaches a torque input member to a support shaft fixed to a base, and fits around the support shaft a spring sleeve that exhibits elasticity in the direction of diameter expansion when the diameter is contracted. At the same time, one end of the spring sleeve is connected to the torque input member, and a torque receiving member having the same diameter as the natural diameter of the spring sleeve is fitted around the support shaft and fixed to the base, and the above sleeve and the torque receiving member are connected to each other. A coil spring having an inner diameter smaller than these outer diameters in its natural state and wound in a direction opposite to the forward rotation direction of the torque input member is wound over the outer peripheral surfaces of both of the coil springs with a diameter larger than the diameter in its natural state. That is.
トルク入力部材が静止した状態（以下、単に静止状態と
いう、）では、コイルバネがバネスリーブを一定の締付
力で締付けた状態にある。When the torque input member is in a stationary state (hereinafter simply referred to as a stationary state), the coil spring is in a state in which the spring sleeve is tightened with a constant tightening force.
トルク入力部材に、例えば容器の蓋が連結されている場
合、上記の締付力は蓋の自重によって蓋が閉まることは
ないが、若干の力を加えると蓋が閉まる程度のブレーキ
トルクを発生する。For example, if the lid of a container is connected to the torque input member, the above tightening force will not cause the lid to close due to its own weight, but if a slight force is applied, a brake torque will be generated that will close the lid. .
トルク入力部材を正回転させると、これと一体のバネス
リーブがコイルバネを拡径する方向に回転するので、バ
ネスリーブに対する締付力が小さくなり、小さいトルク
でトルク入力部材を回転させることができる。When the torque input member is rotated in the forward direction, the spring sleeve integrated therewith rotates in a direction that expands the diameter of the coil spring, so the tightening force on the spring sleeve is reduced, and the torque input member can be rotated with a small torque.
逆に、トルク入力部材を逆回転させると、バネスリーブ
はコイルバネの巻き方向に回転するため、コイルバネが
縮径し、同時にバネスリーブも縮径する。Conversely, when the torque input member is rotated in the opposite direction, the spring sleeve rotates in the winding direction of the coil spring, so that the diameter of the coil spring is reduced, and at the same time, the diameter of the spring sleeve is also reduced.
コイルバネが縮径すると、コイルバネのＩｌｌ付力が小
さくなるが、バネスリーブの径方向に拡大する力が大き
くなり、コイルバネとバネスリーブ間にはある程度の締
付力が生じるが、バネスリーブの拡径方向の弾力を適宜
設定することにより、必要以上に大きな締付力になるこ
とはない、蓋を閉める途中の任意の開放角度でトルク入
力を零にすると、コイルバネ及びバネスリーブは元の静
止状態に戻るため、任意の開放角度に保持することがて
きる。When the diameter of the coil spring decreases, the biasing force of the coil spring decreases, but the force that expands the spring sleeve in the radial direction increases, and a certain amount of tightening force is generated between the coil spring and the spring sleeve. By appropriately setting the elasticity in the direction, the tightening force will not be larger than necessary.If the torque input is reduced to zero at any opening angle while closing the lid, the coil spring and spring sleeve will return to their original static state. It can be held at any opening angle to return.
第１図及び第２図は、実施例の正逆回転トルクリミッタ
１を、例えば事務機のハウジング２と蓋３との間に設け
た例を示している。蓋３はヒンジビン４により開閉自在
に取付けられ、ヒンジビン４には扇形歯車５が取付けら
れる。1 and 2 show an example in which the forward/reverse rotation torque limiter 1 of the embodiment is provided between, for example, a housing 2 and a lid 3 of an office machine. The lid 3 is attached to be openable and closable by a hinge bin 4, and a sector gear 5 is attached to the hinge bin 4.
トルクリミッタ１のベース６はハウジング２の内側面に
固定される。ベース６に上記のヒンジビン４と平行の支
持軸７の一端を固定し、他端にトルク入力部材としての
歯車８が取付けられる。この歯車８は前記の扇形歯車５
と噛み合う。A base 6 of the torque limiter 1 is fixed to the inner surface of the housing 2. One end of a support shaft 7 parallel to the hinge bin 4 is fixed to the base 6, and a gear 8 as a torque input member is attached to the other end. This gear 8 is the sector gear 5 described above.
meshes with
上記のベース６と歯車８との間において、支持軸７のま
わりに筒形のトルク受け部材９及び断面Ｃ形のバネスリ
ーブ１０が嵌められる。バネスリーブ１０は第３図に示
すように、軸方向にスリット１１が設けられ、そのスリ
ット１１の幅を小さくする方向に圧縮すると拡径方向に
弾性を発揮する。A cylindrical torque receiving member 9 and a C-shaped spring sleeve 10 are fitted around the support shaft 7 between the base 6 and the gear 8 described above. As shown in FIG. 3, the spring sleeve 10 is provided with a slit 11 in the axial direction, and when compressed in a direction to reduce the width of the slit 11, it exhibits elasticity in the direction of diameter expansion.
トルク受け部材９の外径は、自然状態にあるバネスリー
ブ１０の外径と同一であり、両者の内端面が相互に突き
合わされる。The outer diameter of the torque receiving member 9 is the same as the outer diameter of the spring sleeve 10 in its natural state, and their inner end surfaces abut each other.
トルク受け部材９の外端はベース６に固定される、また
バネスリーブ１０の外端の４個所に差込み部１２が設け
られ（第３図参照）、各差込み部１２は、歯車８の軸挿
入孔１３のまわりに設けた４個所の係合凹所１４に嵌め
られる。差込み部１２は係合凹所１４に対し、周方向に
はすき間がなく、径方向には自由に移動できるように嵌
められる。The outer end of the torque receiving member 9 is fixed to the base 6, and insert portions 12 are provided at four locations on the outer end of the spring sleeve 10 (see FIG. 3). It is fitted into four engagement recesses 14 provided around the hole 13. The insertion portion 12 is fitted into the engagement recess 14 so that there is no gap in the circumferential direction and it can freely move in the radial direction.
上記のトルク受け部材９とバネスリーブ１０のまわりに
は、一つのコイルバネ１５が嵌められる。One coil spring 15 is fitted around the torque receiving member 9 and spring sleeve 10.
コイルバネ１５は断面角形の一本の線材で形成され、そ
の一端に回り止め用の爪１６が設けられる。The coil spring 15 is formed of a single wire rod having a rectangular cross section, and a detent pawl 16 is provided at one end thereof.
上記のコイルバネ１５は、若干拡径した状態でトルク受
け部材９とバネスリーブ１０のまわりに巻き付き、回り
止め用の爪１６はベース６の凹所１７に挿入される。The coil spring 15 is wound around the torque receiving member 9 and the spring sleeve 10 in a slightly enlarged diameter state, and the anti-rotation pawl 16 is inserted into the recess 17 of the base 6.
コイルバネ１５の巻き方向（第２図の矢印ａ参照）は、
蓋２を開放する際の歯車８の回転方向（第２図の矢印す
参照）を正回転とした場合、その回転方向と逆方向であ
る。従って、蓋３が開放される場合、歯車８はコイルバ
ネ１５の巻き方向と反対方向に回転し、蓋３が閉められ
る場合、歯車８はコイルバネ１５の巻き方向と同一方向
に回転する。The winding direction of the coil spring 15 (see arrow a in FIG. 2) is as follows:
When the direction of rotation of the gear 8 when opening the lid 2 (see the arrow in FIG. 2) is defined as forward rotation, this is the opposite direction to the direction of rotation. Therefore, when the lid 3 is opened, the gear 8 rotates in the opposite direction to the winding direction of the coil spring 15, and when the lid 3 is closed, the gear 8 rotates in the same direction as the winding direction of the coil spring 15.
実施例の装置は以上のごときものであるから、蓋３を閉
めた静止状態において、コイルバネ１５は、バネスリー
ブ１０とトルク受け部材９のまわりに一定の締付力で巻
き付く。ハネスリーブ１０のスリット１１の幅δば、第
４図に示すように、自然状態と変わらない状態にある。Since the apparatus of the embodiment is as described above, in a stationary state with the lid 3 closed, the coil spring 15 is wound around the spring sleeve 10 and the torque receiving member 9 with a constant tightening force. As shown in FIG. 4, the width δ of the slit 11 of the spring sleeve 10 remains unchanged from its natural state.
なお、このときのバネスリーブ１０の外径をｄ１コイル
バネ１５の外径をＤとする。Note that the outer diameter of the spring sleeve 10 at this time is d1, and the outer diameter of the coil spring 15 is D.
蓋３をヒンジピン４を中心に回動させて開放すると、歯
車８が正回転する。この回転方向はコイルバネ１５の巻
き方向と逆方向であるため、コイルバネ１５はバネスリ
ーブ１０との摩擦力により拡径方向に力を受ける。従っ
てコイルバネ１５の外径は第５図に示すようにＤ′に増
大するが、バネスリーブ１０は自然状態にあり、スリッ
ト１１の幅δは変わらず、従って、その外径も変わらな
い。そのため、コイルバネ１５とバネスリーブ１０との
間摩擦力は低減し、小さいトルクで蓋３を開放すること
ができる。When the lid 3 is rotated around the hinge pin 4 and opened, the gear 8 rotates in the forward direction. Since this rotating direction is opposite to the winding direction of the coil spring 15, the coil spring 15 receives a force in the diametrically expanding direction due to the frictional force with the spring sleeve 10. Therefore, although the outer diameter of the coil spring 15 increases to D' as shown in FIG. 5, the spring sleeve 10 remains in its natural state, the width δ of the slit 11 remains unchanged, and therefore its outer diameter also remains unchanged. Therefore, the frictional force between the coil spring 15 and the spring sleeve 10 is reduced, and the lid 3 can be opened with a small torque.
一方、蓋３を閉める際には、歯車８の回転方向とコイル
バネ１５の巻き方向が一致するので、コイルバネ１５が
バネスリーブ１０の摩擦力により締付は方向にねじられ
る。このため、第６図に示すように、コイルバネ１５の
外径はＤ′に縮小するが、同時にバネスリーブ１０の外
径もｄ“に縮小し、更にそのスリット１１の幅もδ“に
縮小する。On the other hand, when closing the lid 3, the rotating direction of the gear 8 and the winding direction of the coil spring 15 coincide, so that the coil spring 15 is tightened by the frictional force of the spring sleeve 10 and twisted in the direction. Therefore, as shown in FIG. 6, the outer diameter of the coil spring 15 is reduced to D', but at the same time the outer diameter of the spring sleeve 10 is also reduced to d", and the width of the slit 11 is also reduced to δ". .
コイルバネ１５に外径が縮小すると、自然状態の径に近
づくため、そのバネ力は弱くなるが、バネスリーブ１０
が縮小して拡径方向の弾力が増大するので、コイルバネ
１５とバネスリーブ１０間には所要の摩擦力が作用する
。この場合、摩擦力が大きすぎると蓋３を閉めるのに大
きな力が必要となり、不便であるので、小さい力で蓋３
を閉じることができる程度にコイルバネ１５及びバネス
リーブ１０のバネ定数を設定しておく。When the outer diameter of the coil spring 15 is reduced, it approaches the diameter in its natural state, so its spring force becomes weaker, but the spring sleeve 10
is reduced and the elasticity in the diametrically expanding direction increases, so a required frictional force acts between the coil spring 15 and the spring sleeve 10. In this case, if the frictional force is too large, a large force is required to close the lid 3, which is inconvenient, so a small force is required to close the lid 3.
The spring constants of the coil spring 15 and the spring sleeve 10 are set to such an extent that the coil spring 15 and the spring sleeve 10 can be closed.
蓋３を途中で止めると、コイルバネ１５は静止状態（第
４図の状態）に戻るが、この状態においてコイルバ２１
５はバネスリーブ１０を所要の締付力で締付けるため、
Ｍ３は任意の開放角度に保持される。When the lid 3 is stopped halfway, the coil spring 15 returns to its resting state (the state shown in FIG. 4), but in this state, the coil spring 21
5 is for tightening the spring sleeve 10 with the required tightening force,
M3 is held at any open angle.
以上のように、この発明のトルクリミッタは、静止状態
においてコイルバネの締付力により所要のブレーキトル
クが発生できるように設定され、トルク入力部材が正回
転するとブレーキトルクが軽減され、小さい力で蓋を開
放することができる。As described above, the torque limiter of the present invention is set so that the required brake torque can be generated by the tightening force of the coil spring in a stationary state, and when the torque input member rotates forward, the brake torque is reduced, and the lid is closed with a small force. can be opened.
また、トルク入力部材を上記と逆方向に回転させると、
ブレーキトルクが増大する方向になるが、同時にバネス
リーブが縮径してブレーキトルクの増大を一定限度以下
に抑制するため、必要以上にブレーキトルクが増大する
ことがない。Also, if the torque input member is rotated in the opposite direction to the above,
Although the brake torque increases, at the same time, the spring sleeve reduces its diameter and suppresses the increase in brake torque to below a certain limit, so the brake torque does not increase more than necessary.
また、開放又は閉止の途中で蓋から手を離すと、コイル
バネは常に静止状態に戻るため、蓋を任意の開放角度に
保持することができる。Furthermore, if the lid is released during opening or closing, the coil spring always returns to its resting state, so the lid can be held at any opening angle.
第１図は実施例の横断平面図、第２図は同上の縦断側面
図、第３図は一部省略分解斜視図、第４図から第６図は
コイルバネとバネスリーブの関係の作用説明図、第７図
は従来例の平面図である。
１・・・・・・正逆回転トルクリミッタ、２・・・・・
・ハウジング、 ３・・・・・・蓋、４・・・・
・・ヒンジビンで ５・・・・・・歯車、６・・・
・・・ベース、 ７・・・・・・支持軸、８・
・・・・・歯車、 ９・・・・・・トルク受
け部材、１０・・・・・・バネスリーブ、 １１・・
・・・・スリット、１２・・・・・・差込み部、
１３・・・・・・軸挿入孔、１４・・・・・・係合凹所
、 １５・・・・・・コイルバネ、１６・・・・・
・爪、 １７・・・・・・凹所。
特許出願人 エヌティエヌ株式会社同Fig. 1 is a cross-sectional plan view of the embodiment, Fig. 2 is a vertical cross-sectional side view of the same as above, Fig. 3 is a partially omitted exploded perspective view, and Figs. 4 to 6 are explanatory views of the relationship between the coil spring and the spring sleeve. , FIG. 7 is a plan view of a conventional example. 1... Forward/reverse rotation torque limiter, 2...
・Housing, 3...Lid, 4...
...with hinge bin 5...gear, 6...
...Base, 7...Support shaft, 8.
... Gear, 9 ... Torque receiving member, 10 ... Spring sleeve, 11 ...
...Slit, 12...Insert part,
13...Shaft insertion hole, 14...Engagement recess, 15...Coil spring, 16...
・Claw, 17... recess. Patent applicant: NT Co., Ltd.
Claims (1)
自在に取付け、縮径すると拡径方向の弾力を発揮するバ
ネスリーブを上記の支持軸のまわりに嵌めると共にその
バネスリーブの一端をトルク入力部材に結合し、上記支
持軸のまわりにバネスリーブの自然状態の径と同径のト
ルク受け部材を嵌めこれをベースに固定し、上記のスリ
ーブとトルク受け部の両者の外周面にわたり、自然状態
でこれらの外径より小さい内径を有し、かつトルク入力
部材の正回転方向と逆向きに巻かれたコイルバネを自然
状態の径より拡大した径で巻き付けてなる正逆回転トル
クリミッタ。(1) A torque input member is rotatably attached to the support shaft fixed to the base, and a spring sleeve that exhibits elasticity in the direction of diameter expansion when the diameter is contracted is fitted around the support shaft, and one end of the spring sleeve is used to input torque. A torque receiving member having the same diameter as the spring sleeve in its natural state is fitted around the support shaft, and this is fixed to the base, so that the outer peripheral surface of both the sleeve and the torque receiving part is covered in the natural state. A forward/reverse rotation torque limiter is formed by winding a coil spring having an inner diameter smaller than these outer diameters and wound in a direction opposite to the normal rotation direction of the torque input member with a diameter larger than the diameter in the natural state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20484590A JPH0488242A (en) | 1990-07-30 | 1990-07-30 | Normal/reverse revolution torque limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20484590A JPH0488242A (en) | 1990-07-30 | 1990-07-30 | Normal/reverse revolution torque limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0488242A true JPH0488242A (en) | 1992-03-23 |
Family
ID=16497348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20484590A Pending JPH0488242A (en) | 1990-07-30 | 1990-07-30 | Normal/reverse revolution torque limiter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0488242A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5318161A (en) * | 1993-02-08 | 1994-06-07 | Pitney Bowes Inc. | Wrap spring clutch assembly |
-
1990
- 1990-07-30 JP JP20484590A patent/JPH0488242A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5318161A (en) * | 1993-02-08 | 1994-06-07 | Pitney Bowes Inc. | Wrap spring clutch assembly |
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