JPH0956117A - Gear motor with frictional torque limiter mechanism - Google Patents
Gear motor with frictional torque limiter mechanismInfo
- Publication number
- JPH0956117A JPH0956117A JP20689095A JP20689095A JPH0956117A JP H0956117 A JPH0956117 A JP H0956117A JP 20689095 A JP20689095 A JP 20689095A JP 20689095 A JP20689095 A JP 20689095A JP H0956117 A JPH0956117 A JP H0956117A
- Authority
- JP
- Japan
- Prior art keywords
- friction
- geared motor
- torque limiter
- gear
- limiter mechanism
- 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
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、車載用電動カーテン装
置や自動錠剤計数システム等に用いられるギアドモータ
に関し、特に、従動節に過負荷又はしきい値負荷が印加
したとき原動節から従動節へのトルク伝達を自動的に遮
断する摩擦式トルクリミッタを備えたギアドモータに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geared motor used in an on-vehicle electric curtain device, an automatic tablet counting system, etc., and more particularly, from a driving node to a driven node when an overload or a threshold load is applied to the driven node. The present invention relates to a geared motor equipped with a friction type torque limiter that automatically cuts off the torque transmission of the above.
【０００２】[0002]
【従来の技術】従来、小型モータのモータシャフトに減
速歯車機構を一体的に組付けたギアドモータ（アクチュ
エータ）は例えばビデオ・オーディオ機器等の駆動部に
良く用いられているが、最近では車載用電動カーテン装
置や自動錠剤計数システムにも用いられるようになって
来ている。車載用電動カーテン装置等においては、カー
テン等が完全開成又は完全閉成して従動節がストッパに
当接して停止状態になると、原動節から従動節へのトル
ク伝達を遮断し、モータ自身の過負荷状態を可及的に解
除するためのトルクリミッタ機構が組み込まれたものが
知られている。2. Description of the Related Art Conventionally, a geared motor (actuator) in which a reduction gear mechanism is integrally assembled to a motor shaft of a small motor is often used in a drive section of, for example, a video / audio device, but recently, it has been mounted on an electric vehicle. It has also come to be used in curtain devices and automatic tablet counting systems. In an on-vehicle electric curtain device, etc., when the curtain etc. is fully opened or completely closed and the follower joint comes into contact with the stopper to stop it, the torque transmission from the drive joint to the follower joint is cut off, and the motor itself is overloaded. It is known that a torque limiter mechanism for canceling the loaded state is incorporated as much as possible.
【０００３】図４は従来の摩擦式トルクリミッタ機構を
備えたギアドモータを示す断面図である。このギアドモ
ータは、小型モータ１のモータシャフト２に空回り可能
に軸支された小歯車の原動歯車３及び従動軸（伝達軸）
４に軸支されて原動歯車３に噛み合う大歯車の従動（伝
達）歯車５を備えた１段目減速歯車機構と、原動歯車３
とモータ１との間でモータシャフト１に巻回され、モー
タシャフト１の抜け止めための先端側フランジ６の内面
６ａに原動歯車３の側端面３ａを押し付けて付勢する圧
縮コイルスプリング７を備えた摩擦式トルクリミッタ機
構とから成る。FIG. 4 is a sectional view showing a geared motor provided with a conventional friction type torque limiter mechanism. This geared motor includes a driving gear 3 and a driven shaft (transmission shaft) which are small gears that are rotatably supported by a motor shaft 2 of a small motor 1.
A first stage reduction gear mechanism including a driven (transmission) gear 5 that is a large gear that is axially supported by 4 and meshes with a driving gear 3;
And a motor 1. The compression coil spring 7 is wound between the motor shaft 1 and the motor 1 and presses the side end surface 3a of the driving gear 3 against the inner surface 6a of the tip side flange 6 for preventing the motor shaft 1 from coming off. And a friction type torque limiter mechanism.
【０００４】通常、圧縮コイルスプリング７の弾性付勢
力によって原動歯車３の側端面３ａがフランジ６の内面
６ａに押し付けられているので、原動歯車３はその側端
面３ａとフランジ６の内面６ａとの摩擦によりモータシ
ャフト１の回転に追従して回転するため、従動軸４も従
動歯車５を介して回転し、減速機構の後段側（従動側）
に高トルクが出力される。Since the side end surface 3a of the driving gear 3 is normally pressed against the inner surface 6a of the flange 6 by the elastic biasing force of the compression coil spring 7, the driving gear 3 is separated from the side end surface 3a of the flange 6 and the inner surface 6a of the flange 6. Since the motor shaft 1 rotates by following the rotation due to friction, the driven shaft 4 also rotates via the driven gear 5, and the downstream side (driven side) of the reduction mechanism.
High torque is output to.
【０００５】しかし、操作対象等の従動側に過負荷又は
しきい値負荷が加わると、従動側から摩擦式トルクリミ
ッタ機構の原動歯車３までに回転抵抗力が遡及するの
で、フランジ６の内面６ａと原動歯車の側端面３ａとに
僅かなスリップが生じ、そのまま一気にスリップ状態と
なって空回りするため、従動歯車５への回転力（トル
ク）伝達が解除されることとなる。これによって、従動
節が運動停止するとモータの過負荷がフェイルセーフ的
に解除される。However, if an overload or a threshold load is applied to the driven side of the operation target or the like, the rotational resistance force will retroactively flow from the driven side to the driving gear 3 of the friction torque limiter mechanism, and therefore the inner surface 6a of the flange 6 will be described. Then, a slight slip occurs on the side end surface 3a of the driving gear, and the slip state suddenly shifts to idle so that the rotational force (torque) transmission to the driven gear 5 is released. As a result, when the driven joint stops moving, the motor overload is released in a fail-safe manner.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
摩擦式トルクリミッタ機構を備えたギアドモータにあっ
ては、次のような問題点がある。However, the geared motor provided with the above-mentioned friction type torque limiter mechanism has the following problems.
【０００７】 摩擦式トルクリミッタ機構において
は、その伝達トルクのしきい値（最大トルク）を決定す
るのは摩擦板に相当するフランジ６の内面６ａと原動歯
車の側端面３ａとの間の静止摩擦力であり、この摩擦力
は抜け止めフランジ６の内面６ａと原動歯車３の側端面
３ａの粗さや接触面積等による静止摩擦係数μと、圧縮
コイルスプリング７の押し付け力Ｆとの積（μＦ）で決
定されるが、フランジ６，原動歯車３，コイルスプリン
グ７は製品毎で製造バラツキがあるため、伝達トルクの
しきい値には三者のバラツキが反映して相乗的に大きな
バラツキが生じてしまう。このため、製品毎の伝達トル
クのしきい値はバラツキが大きく、その設定値の調整に
相当の手間を要していた。In the friction type torque limiter mechanism, the threshold value (maximum torque) of the transmission torque is determined by the static friction between the inner surface 6a of the flange 6 corresponding to the friction plate and the side end surface 3a of the driving gear. This frictional force is the product of the static friction coefficient μ due to the roughness and contact area of the inner surface 6a of the retaining flange 6 and the side end surface 3a of the driving gear 3 and the pressing force F of the compression coil spring 7 (μF). However, since the flange 6, the driving gear 3, and the coil spring 7 have manufacturing variations in each product, the three thresholds of the transmission torque are reflected in the threshold value, and a large variation occurs synergistically. I will end up. Therefore, the threshold value of the transmission torque for each product varies greatly, and it takes a lot of time and effort to adjust the set value.
【０００８】 また、摩擦面やコイルスプリング７の
弾性係数は経年変化に直接影響されるため、伝達トルク
のしきい値が経年変化するという問題もある。Further, since the friction surface and the elastic coefficient of the coil spring 7 are directly influenced by the secular change, there is also a problem that the threshold value of the transmission torque is secularly changed.
【０００９】 更に、トルク伝達期間においては、圧
縮コイルスプリング７の端がモータ１又は原動歯車３の
側端面に常に摺接しているため、使用するにつれ端部の
摩滅や損失等を招来し、経年使用による押し付け力Ｆの
変動をもたらす。Further, during the torque transmission period, the end of the compression coil spring 7 is always in sliding contact with the side end surface of the motor 1 or the driving gear 3, so that the end portion may be worn or lost as it is used. This causes a change in the pressing force F due to use.
【００１０】そこで上記問題点に鑑み、本発明の第１の
課題は、伝達トルクのしきい値の調整が容易に可能な機
構を採用することにより、製品毎の伝達トルクのしきい
値のバラツキを無くすことができる摩擦式トルクリミッ
タ機構を備えたキアドモータを提供することにある。ま
た本発明の第２の課題は、摩擦力を付与するための弾性
部材が可動部材に摺接しない構造とすることにより、弾
性部材の摩滅等を無くし永年使用でも伝達トルクのしき
い値の変動を抑制できる摩擦式トルクリミッタ機構を備
えたキアドモータを実現することにある。In view of the above problems, the first object of the present invention is to employ a mechanism that allows the threshold value of the transmission torque to be easily adjusted, so that the threshold value of the transmission torque varies among products. An object of the present invention is to provide a quad motor equipped with a friction type torque limiter mechanism capable of eliminating the above. A second object of the present invention is to provide a structure in which an elastic member for applying a frictional force does not slidably contact a movable member, thereby eliminating abrasion of the elastic member and changing the threshold value of transmission torque even after long-term use. It is to realize a quad motor equipped with a friction type torque limiter mechanism capable of suppressing the above.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、モータシャフトのトルクを伝達する減速
歯車機構のうち前段側の原動軸に空回り可能に軸支され
た原動歯車と、その原動歯車に噛み合い従動軸に軸支さ
れた従動歯車と、上記原動軸側の摩擦部材を上記原動歯
車の側端面に従動摩擦面として弾力的に圧接させる弾性
手段とを有する摩擦式トルクリミッタ機構を備えたギア
ドモータにおいて、上記原動軸自身は上記弾性手段の付
与すべき弾力値を調整可能の摩擦力調整手段を有して成
ることを特徴とする。In order to solve the above-mentioned problems, the present invention provides a driving gear which is rotatably supported by a driving shaft at a preceding stage of a reduction gear mechanism for transmitting torque of a motor shaft, A friction type torque limiter mechanism having a driven gear that meshes with the driving gear and is axially supported by a driven shaft, and an elastic means that elastically presses the friction member on the driving shaft side as a driven friction surface as a driven friction surface on the side end surface of the driving gear. In the geared motor provided with, the driving shaft itself has a frictional force adjusting means capable of adjusting an elastic force value to be applied by the elastic means.
【００１２】ここで、弾性手段としては原動軸に巻回さ
れた圧縮コイルスプリングであり、摩擦力調整手段とし
ては圧縮コイルスプリングの圧縮長を調整可能のねじ機
構とすることができる。また、原動軸は先端側から原動
歯車を嵌め受ける基部側フランジ部を一体的に有してお
り、ねじ機構としては、原動軸のうち原動歯車よりも先
端側に形成されたねじ部と、このねじ部に螺合して変位
するスプリング留め部材とから構成できる。更に、上記
ねじ部は雄ねじ部であり、上記スプリング留め部材は調
整ナットとすることができる。なお、調整ナットはロー
レット刻印周面を有して成ることが好ましい。Here, the elastic means may be a compression coil spring wound around a driving shaft, and the friction force adjusting means may be a screw mechanism capable of adjusting the compression length of the compression coil spring. Further, the driving shaft integrally has a base side flange portion for receiving the driving gear from the tip side, and as a screw mechanism, a screw portion formed on the driving shaft toward the tip side of the driving gear, It can be configured with a spring retaining member that is displaced by being screwed into the screw portion. Further, the threaded portion may be a male threaded portion, and the spring retaining member may be an adjusting nut. The adjusting nut preferably has a knurled peripheral surface.
【００１３】そして、上記摩擦部材としては、上記基部
側フランジ部と原動歯車の一方の側端面との間に介装さ
れた第１の耐熱滑性の樹脂製ワッシャと、原動歯車の他
方の側端面と前記圧縮コイルプリングとの間に介装され
た第２の耐熱滑性の樹脂製ワッシャとを有して成ること
が望ましい。As the friction member, a first heat-resistant lubricous resin washer interposed between the base side flange portion and one side end surface of the driving gear, and the other side of the driving gear. It is desirable to have a second heat-resistant lubricous resin washer interposed between the end face and the compression coil pulling.
【００１４】[0014]
【作用】本発明の摩擦式トルクリミッタ機構を備えたキ
アドモータにおいては、摩擦力調整手段により弾性手段
の付与すべき弾力値を調整できるようになっているた
め、摩擦式トルクリミッタ機構の静止摩擦力の調整が可
能となり、それ故、伝達トルクのしきい値の調整ができ
る。このため、製品バラツキを吸収でき、キアドモータ
の歩留まりの向上を図ることができる。また経年変化に
よりしきい値が変動しても摩擦力調整手段により簡単に
校正することができる。In the key motor having the friction type torque limiter mechanism of the present invention, since the elastic force value to be given to the elastic means can be adjusted by the friction force adjusting means, the static friction force of the friction type torque limiter mechanism can be adjusted. Can be adjusted and therefore the threshold value of the transmission torque can be adjusted. Therefore, product variations can be absorbed, and the yield of the key motor can be improved. Even if the threshold value changes due to aging, it can be easily calibrated by the frictional force adjusting means.
【００１５】ここで、本発明は、弾性手段としては原動
軸に巻回された圧縮コイルスプリングを採用し、摩擦力
調整手段としては圧縮コイルスプリングの圧縮長を調整
可能のねじ機構を採用できるが、ねじ機構を操作するこ
とで圧縮コイルスプリングの圧縮長を可変でき、この結
果、摩擦式トルクリミッタ機構の静止摩擦力，即ち、伝
達トルクのしきい値の調整が容易にできる。In the present invention, a compression coil spring wound around a driving shaft can be used as the elastic means, and a screw mechanism capable of adjusting the compression length of the compression coil spring can be used as the friction force adjusting means. By operating the screw mechanism, the compression length of the compression coil spring can be varied, and as a result, the static friction force of the friction torque limiter mechanism, that is, the threshold value of the transmission torque can be easily adjusted.
【００１６】また、原動軸が先端側から原動歯車を嵌め
受ける基部側フランジ部を一体的に有しており、ねじ機
構としては、原動軸のうち原動歯車よりも先端側に形成
されたねじ部と、このねじ部に螺合して変位するスプリ
ング留め部材とから構成されている場合には、スプリン
グ留め部材を回すことで圧縮コイルスプリングの圧縮長
を可変できる訳であるが、原動歯車の一方の側端面が摩
擦盤として基部側フランジ部側に接触し、スプリング留
め部材が原動軸の先端側に螺合している構造となるの
で、スプリング留め部材に対する操作性は原動軸の基部
側にスプリング留め部材が螺合した構造の場合に比して
良好となる。Further, the driving shaft integrally has a base side flange portion into which the driving gear is fitted from the tip end side, and the screw mechanism is a screw portion formed on the driving shaft toward the tip side of the driving gear. And a spring retaining member that is displaced by being screwed into the threaded portion, the compression length of the compression coil spring can be changed by turning the spring retaining member. Since the side end surface of the spring contacts the base side flange side as a friction plate, and the spring retaining member is screwed on the tip side of the driving shaft, the operability for the spring retaining member is the spring on the base side of the driving shaft. This is better than the case where the fastening member is screwed together.
【００１７】そして、上記摩擦部材として、原動歯車の
一方の側端面に接触する第１の耐熱滑性の樹脂製ワッシ
ャと、原動歯車の他方の側端面に接触する第２の耐熱滑
性の樹脂製ワッシャを用いた場合には、原動歯車の両側
端面が摩擦盤となり、従前に比して摩擦面積を倍増でき
るため、伝達トルクのしきい値のダイナミックレンジを
拡大できる。また、耐熱滑性の樹脂製ワッシャを介装し
てあるので、摩擦熱による摩擦面の劣化を有効的に防ぐ
ことができ、長寿命化を図ることができる。更に、圧縮
コイルスプリングはトルク伝達，遮断の如何にかかわら
ず、原動軸と共に回っており、摺接部位を有していな
い。このため、圧縮コイルスプリング自体の摩滅や損失
等が発生せず、設定されたトルクしいき値を永く持続で
きる。As the friction member, a first heat-resistant slip resin washer that contacts one side end surface of the driving gear and a second heat-resistant slip resin contact that contacts the other side end surface of the driving gear. When the washer made is used, both end faces of the driving gear serve as friction plates, and the friction area can be doubled as compared with the conventional case, so that the dynamic range of the threshold value of the transmission torque can be expanded. Further, since the heat-resistant slippery resin washer is interposed, deterioration of the friction surface due to frictional heat can be effectively prevented, and the life can be extended. Further, the compression coil spring rotates together with the driving shaft regardless of whether the torque is transmitted or cut off, and has no sliding contact portion. Therefore, the compression coil spring itself is not worn or lost, and the set torque threshold value can be maintained for a long time.
【００１８】[0018]
【実施例】次に、本発明の実施例を添付図面に基づいて
説明する。Embodiments of the present invention will now be described with reference to the accompanying drawings.
【００１９】本発明の実施例に係る摩擦式トルクリミッ
タ機構を備えたギアドモータの要部を示す断面図、図２
は同実施例のギアドモータの断面図、図３は同実施例の
ギアドモータの平面図である。FIG. 2 is a sectional view showing the main part of a geared motor having a friction type torque limiter mechanism according to an embodiment of the present invention.
Is a cross-sectional view of the geared motor of the same embodiment, and FIG. 3 is a plan view of the geared motor of the same embodiment.
【００２０】本例の摩擦式トルクリミッタ機構を備えた
ギアドモータの歯車減速機構は、小型モータ１０のモー
タシャフト１２に圧入固定された原動軸１３と、この原
動軸１３に空回り可能に軸支された第１小歯車の原動歯
車１４と、原動歯車１４に噛み合い第１従動軸１５に軸
支された第１大歯車の従動歯車１６と、この従動歯車１
６の上部同軸で回転する第２小歯車１７と、第２小歯車
１７に噛み合い第２従動軸１８に軸支された第２大歯車
１９と、この第２大歯車１９の上部同軸で回転する第３
小歯車２０と、この第３小歯車２０に噛み合い第１従動
軸１８に軸支された第３大歯車２１と、この第３大歯車
２１の上部同軸で回転する第４小歯車２２と、この第４
小歯車２２に噛み合い出力軸２３に軸支された第４大歯
車２４とから成る。The gear reduction mechanism of the geared motor provided with the friction type torque limiter mechanism of this embodiment is a driving shaft 13 press-fitted and fixed to a motor shaft 12 of a small-sized motor 10 and a rotatably supported shaft of the driving shaft 13. A driving gear 14 which is a first small gear, a driven gear 16 which is a first large gear meshed with the driving gear 14 and supported by a first driven shaft 15, and the driven gear 1
6, a second small gear 17 that rotates in the upper coaxial, a second large gear 19 that meshes with the second small gear 17 and is supported by a second driven shaft 18, and rotates in the upper coaxial of the second large gear 19. Third
A small gear 20, a third large gear 21 meshing with the third small gear 20 and pivotally supported by the first driven shaft 18, a fourth small gear 22 rotating coaxially above the third large gear 21, and Fourth
It comprises a fourth large gear 24 meshed with a small gear 22 and rotatably supported by an output shaft 23.
【００２１】本例の摩擦式トルクリミッタ機構は、原動
軸１３の基部側に一体的に形成された基部側フランジ部
１３ａの面に重ねて嵌めた第１の耐熱滑性の樹脂製ワッ
シャ３２ａと、これに一方の側端面を重ねて嵌めた原動
歯車（平歯車）１４の他方の側端面に対して重ねて嵌め
た第２の耐熱滑性の樹脂製ワッシャ３２ｂと、樹脂製ワ
ッシャ３２ｂに重ねて嵌めた均圧環としての金属製ワッ
シャ３３と、原動軸１３の先端側に巻回され、金属製ワ
ッシャ３３を原動歯車１４ね弾力的に押し付ける圧縮コ
イルスプリング３４と、圧縮コイルスプリング３４の圧
縮長を長短可変する摩擦調整用のねじ機構４０とを有し
ている。このねじ機構４０は原動軸１３の先端側に形成
されたねじ部（ボルト部）４２と、このねじ部に螺合す
るナット状のスプリング留め部材４３とから成る。スプ
リング留め部材４３は平目ローレット刻印周面を有して
いる。The friction type torque limiter mechanism of this embodiment includes a first heat resistant slip resin washer 32a which is fitted on the surface of a base side flange portion 13a integrally formed on the base side of the driving shaft 13 so as to overlap. , A second heat-resistant lubricous resin washer 32b fitted to the other side end surface of the driving gear (spur gear) 14 in which one side end surface is fitted to the other, and a resin washer 32b. The metal washer 33 as a pressure equalizing ring, which is fitted with the compression washer, the compression coil spring 34 wound around the tip end side of the driving shaft 13 and elastically pressing the metal washer 33 to the driving gear 14, and the compression length of the compression coil spring 34. And a screw mechanism 40 for adjusting the friction for changing the length of the friction. The screw mechanism 40 includes a screw portion (bolt portion) 42 formed on the tip end side of the driving shaft 13, and a nut-shaped spring retaining member 43 screwed to the screw portion. The spring fastening member 43 has a flat knurled peripheral surface.
【００２２】圧縮コイルスプリング３４の弾性押し付け
力によって原動歯車１４の両側端面が摩擦盤として樹脂
製ワッシャ３２ａ，３２ｂに接触しているため、小型モ
ータ１０が作動して原動軸１３が回転すると、その静止
摩擦力により原動歯車１４が追従回転し、これにより従
動歯車１６へトルクが伝達され、４段の減速歯車機構を
介して出力軸２３に高トルクが出力される。Since both end surfaces of the driving gear 14 are in contact with the resin washers 32a and 32b as friction plates by the elastic pressing force of the compression coil spring 34, when the small motor 10 operates and the driving shaft 13 rotates, The static frictional force causes the driving gear 14 to follow and rotate, whereby torque is transmitted to the driven gear 16 and high torque is output to the output shaft 23 via the four-stage reduction gear mechanism.
【００２３】操作対象等の出力軸側に過負荷又はしきい
値負荷が加わると、出力軸２３から第１従動歯車１６ま
でに回転抵抗力が遡及するので、原動歯車１４の両側端
面と樹脂製ワッシャ３２ａ，３２ｂの接触に僅かなスリ
ップが生じると、そのまま一気にスリップ状態となって
空回りし、これにより従動歯車１６へのモータ１からの
回転力（トルク）伝達が解除されることとなる。When an overload or a threshold load is applied to the output shaft side of the operation target or the like, the rotational resistance force is retroactively extended from the output shaft 23 to the first driven gear 16, so that both end faces of the driving gear 14 and the resin-made gear are made of resin. When a slight slip occurs in the contact between the washers 32a and 32b, the washer immediately slips into a slip state and idles, whereby the rotational force (torque) transmission from the motor 1 to the driven gear 16 is released.
【００２４】摩擦調整用のねじ機構４０のスプリング留
め部材４３を回すと、コイルスプリング３４の圧縮長を
可変できる。圧縮長を長くして締め付けると、弾性押し
付け力が増すので、原動歯車１４の両側端面と樹脂製ワ
ッシャ３２ａ，３２ｂとの静止摩擦力が増強し、それ
故、伝達トルクのしきい値を高めることができ、しきい
値調整が可能となっている。By rotating the spring retaining member 43 of the screw mechanism 40 for friction adjustment, the compression length of the coil spring 34 can be varied. When the compression length is increased and tightened, the elastic pressing force increases, so that the static frictional force between the both end surfaces of the driving gear 14 and the resin washers 32a and 32b is increased, and therefore, the threshold value of the transmission torque is increased. The threshold can be adjusted.
【００２５】本例では、原動歯車１４の一方の側端面が
摩擦盤として基部側フランジ部１３ａ側に接触し、スプ
リング留め部材４３が原動軸１３の先端側に螺合してい
る構造となっている。このため、スプリング留め部材４
３に対する操作性は原動軸１３の基部側にスプリング留
め部材が螺合した構造の場合に比して良好となる。In this example, one end face of the driving gear 14 is in contact with the base side flange 13a side as a friction disc, and the spring retaining member 43 is screwed onto the tip end side of the driving shaft 13. There is. Therefore, the spring retaining member 4
The operability for 3 is better than that of the structure in which the spring retaining member is screwed on the base side of the driving shaft 13.
【００２６】また、原動歯車１４の両側端面が摩擦盤と
なり、従前に比して摩擦面積を倍増できるため、伝達ト
ルクのしきい値のダイナミックレンジを拡大できる。Further, since both end surfaces of the driving gear 14 serve as friction plates and the friction area can be doubled as compared with the conventional case, the dynamic range of the threshold value of the transmission torque can be expanded.
【００２７】更に、本例では耐熱滑性の樹脂製ワッシャ
３２ａ，３２ｂを摩擦面に介装してあるので、摩擦熱に
よる摩擦面の劣化を有効的に防ぐことができ、長寿命化
を図ることができる。Furthermore, in this embodiment, since the heat-slip resistant resin washers 32a and 32b are provided on the friction surface, deterioration of the friction surface due to friction heat can be effectively prevented, and the service life is prolonged. be able to.
【００２８】更にまた、圧縮コイルスプリング３４はト
ルク伝達，遮断の如何にかかわらず、原動軸１３と共に
回っており、摺接部位を有していない。従って、圧縮コ
イルスプリング３４自体の摩滅や損失等が発生せず、設
定されたトルクしいき値を永く持続できる。Furthermore, the compression coil spring 34 rotates together with the driving shaft 13 regardless of whether the torque is transmitted or cut off, and has no sliding contact portion. Therefore, the compression coil spring 34 itself is not worn or lost, and the set torque threshold value can be maintained for a long time.
【００２９】[0029]
【発明の効果】以上説明したように、本発明は、摩擦式
トルクリミッタ機構を備えたギアドモータにおいて、原
動軸自身が摩擦力を発生させる弾性手段の弾力値を調整
可能の摩擦力調整手段を有して成ることを特徴とする。
従って、次の効果を奏する。As described above, according to the present invention, in the geared motor provided with the friction type torque limiter mechanism, the driving shaft itself has the friction force adjusting means capable of adjusting the elastic force value of the elastic means for generating the friction force. It is characterized by consisting of.
Therefore, the following effects are obtained.
【００３０】 摩擦式トルクリミッタ機構の静止摩擦
力の調整が可能となり、それ故、伝達トルクのしきい値
の調整ができる。このため、製品バラツキを吸収でき、
キアドモータの歩留まりの向上を図ることができる。ま
た経年変化によりしきい値が変動しても摩擦力調整手段
により簡単に校正することができる。It becomes possible to adjust the static friction force of the friction torque limiter mechanism, and therefore the threshold value of the transmission torque can be adjusted. Therefore, product variations can be absorbed,
It is possible to improve the yield of the key motor. Even if the threshold value changes due to aging, it can be easily calibrated by the frictional force adjusting means.
【００３１】 摩擦力調整手段がねじ機構の場合、ね
じ機構を操作することで圧縮コイルスプリングの圧縮長
を可変でき、調整が容易である。When the frictional force adjusting means is a screw mechanism, the compression length of the compression coil spring can be changed by operating the screw mechanism, and the adjustment is easy.
【００３２】 原動軸が先端側から原動歯車を嵌め受
ける基部側フランジ部を一体的に有しており、ねじ機構
としては、原動軸のうち原動歯車よりも先端側に形成さ
れたねじ部と、このねじ部に螺合して変位するスプリン
グ留め部材とから構成されている場合、原動歯車の一方
の側端面が摩擦盤として基部側フランジ部側に接触し、
スプリング留め部材が原動軸の先端側に螺合している構
造となるので、スプリング留め部材に対する操作性は原
動軸の基部側にスプリング留め部材が螺合した構造の場
合に比して良好となる。The driving shaft integrally has a base-side flange portion into which the driving gear is fitted from the distal end side, and the screw mechanism includes a screw portion formed on the driving shaft toward the distal end side of the driving gear, When configured with a spring fastening member that is screwed into this screw portion and displaced, one side end surface of the driving gear contacts the base side flange portion side as a friction plate,
Since the spring fastening member is screwed to the tip side of the driving shaft, the operability with respect to the spring fastening member is better than that of the structure in which the spring fastening member is screwed to the base side of the driving shaft. .
【００３３】 原動歯車の一方の側端面に接触する第
１の耐熱滑性の樹脂製ワッシャと、原動歯車の他方の側
端面に接触する第２の耐熱滑性の樹脂製ワッシャを用い
た場合、原動歯車の両側端面が摩擦盤となり、従前に比
して摩擦面積を倍増できるため、伝達トルクのしきい値
のダイナミックレンジを拡大できる。また、耐熱滑性の
樹脂製ワッシャを介装してあるので、摩擦熱による摩擦
面の劣化を有効的に防ぐことができ、長寿命化を図るこ
とができる。In the case of using the first heat resistant slip resin washer that contacts one side end surface of the driving gear and the second heat resistant slip resin washer that contacts the other side end surface of the driving gear, Since both end surfaces of the driving gear serve as friction plates, and the friction area can be doubled as compared with the conventional case, the dynamic range of the threshold value of the transmission torque can be expanded. Further, since the heat-resistant slippery resin washer is interposed, deterioration of the friction surface due to frictional heat can be effectively prevented, and the life can be extended.
【００３４】 更に、圧縮コイルスプリングはトルク
伝達，遮断の如何にかかわらず、原動軸と共に回ってお
り、摺接部位を有していない。このため、圧縮コイルス
プリング自体の摩滅や損失等が発生せず、設定されたト
ルクしいき値を永く持続できる。Further, the compression coil spring rotates together with the driving shaft regardless of whether the torque is transmitted or cut off, and has no sliding contact portion. Therefore, the compression coil spring itself is not worn or lost, and the set torque threshold value can be maintained for a long time.
【図１】本発明の実施例に係る摩擦式トルクリミッタ機
構を備えたギアドモータの要部を示す断面図である。FIG. 1 is a sectional view showing a main part of a geared motor including a friction type torque limiter mechanism according to an embodiment of the present invention.
【図２】同実施例のギアドモータを示す断面図である。FIG. 2 is a sectional view showing a geared motor of the same embodiment.
【図３】同実施例のギアドモータを示す平面図である。FIG. 3 is a plan view showing a geared motor of the same embodiment.
【図４】従来の摩擦式トルクリミッタ機構を備えたギア
ドモータを示す断面図である。FIG. 4 is a cross-sectional view showing a geared motor including a conventional friction type torque limiter mechanism.
１０…小型モータ １２…モータシャフト １３…原動軸 １３ａ…基部側フランジ部 １４…第１小歯車（原動歯車） １５…第１従動軸 １６…第１大歯車（従動歯車） １７…第２小歯車 １８…第２従動軸 １９…第２大歯車 ２０…第３小歯車 ２１…第３大歯車 ２２…第４小歯車 ２３…出力軸 ２４…第４大歯車 ３２ａ…第１の耐熱滑性の樹脂製ワッシャ ３２ｂ…第２の耐熱滑性の樹脂製ワッシャ ３３…金属製ワッシャ ３４…圧縮コイルスプリング ４０…摩擦調整用ねじ機構 ４２…ねじ部 ４３…ナット状スプリング留め部材。 DESCRIPTION OF SYMBOLS 10 ... Small motor 12 ... Motor shaft 13 ... Driving shaft 13a ... Base side flange part 14 ... 1st small gear (driving gear) 15 ... 1st driven shaft 16 ... 1st large gear (driven gear) 17 ... 2nd small gear 18 ... 2nd driven shaft 19 ... 2nd large gear 20 ... 3rd small gear 21 ... 3rd large gear 22 ... 4th small gear 23 ... Output shaft 24 ... 4th large gear 32a ... 1st heat resistant slipping resin Made washer 32b ... Second heat resistant slip resin washer 33 ... Metal washer 34 ... Compression coil spring 40 ... Friction adjusting screw mechanism 42 ... Screw part 43 ... Nut-shaped spring retaining member.
Claims (6)
歯車機構のうち前段側の原動軸に空回り可能に軸支され
た原動歯車と、該原動歯車に噛み合い従動軸に軸支され
た従動歯車と、前記原動軸側の摩擦部材を前記原動歯車
の側端面に従動摩擦面として弾力的に圧接させる弾性手
段とを有する摩擦式トルクリミッタ機構を備えたギアド
モータにおいて、前記原動軸自身は前記弾性手段の付与
すべき弾力値を調整可能の摩擦力調整手段を有して成る
ことを特徴とする摩擦式トルクリミッタ機構を備えたギ
アドモータ。1. A reduction gear mechanism for transmitting torque of a motor shaft, a driving gear that is rotatably supported by a driving shaft on a preceding stage side so as to be idle, and a driven gear that meshes with the driving gear and is supported by a driven shaft. In a geared motor provided with a friction type torque limiter mechanism having an elastic means for elastically pressing the friction member on the driving shaft side as a driven friction surface of the side end surface of the driving gear, the driving shaft itself is provided with the elastic means. A geared motor equipped with a friction type torque limiter mechanism, characterized in that it comprises a frictional force adjusting means capable of adjusting an elastic force value.
機構を備えたギアドモータにおいて、前記弾性手段は前
記原動軸に巻回された圧縮コイルスプリングであり、前
記摩擦力調整手段は前記圧縮コイルスプリングの圧縮長
を調整可能のねじ機構であることを特徴とする摩擦式ト
ルクリミッタ機構を備えたギアドモータ。2. The geared motor having the friction type torque limiter mechanism according to claim 1, wherein the elastic means is a compression coil spring wound around the driving shaft, and the friction force adjusting means is the compression coil spring. A geared motor equipped with a friction type torque limiter mechanism, which is a screw mechanism capable of adjusting the compression length of the.
機構を備えたギアドモータにおいて、前記原動軸は先端
側から前記原動歯車を嵌め受ける基部側フランジ部を一
体的に有しており、前記ねじ機構は、前記原動軸のうち
前記原動歯車よりも先端側に形成されたねじ部と、この
ねじ部に螺合して変位するスプリング留め部材とを有し
て成ることを特徴とする摩擦式トルクリミッタ機構を備
えたギアドモータ。3. A geared motor having a friction type torque limiter mechanism according to claim 2, wherein the driving shaft integrally has a base side flange portion for receiving the driving gear from the tip side, and the screw is provided. The mechanism includes a screw portion formed on the drive shaft on the tip side of the drive gear, and a spring retaining member that is screwed into the screw portion and displaced. Geared motor with limiter mechanism.
機構を備えたギアドモータにおいて、前記ねじ部は雄ね
じ部であり、前記スプリング留め部材は調整ナットであ
ることを特徴とする摩擦式トルクリミッタ機構を備えた
ギアドモータ。4. The geared motor provided with the friction torque limiter mechanism according to claim 3, wherein the screw portion is a male screw portion and the spring retaining member is an adjusting nut. Geared motor with.
機構を備えたギアドモータにおいて、前記調整ナットは
ローレット刻印周面を有して成ることを特徴とする摩擦
式トルクリミッタ機構を備えたギアドモータ。5. A geared motor having a friction type torque limiter mechanism according to claim 4, wherein the adjusting nut has a knurled peripheral surface, and the geared motor has a friction type torque limiter mechanism.
記載の摩擦式トルクリミッタ機構を備えたギアドモータ
において、前記摩擦部材は、前記基部側フランジ部と前
記原動歯車の一方の側端面との間に介装された第１の耐
熱滑性の樹脂製ワッシャと、前記原動歯車の他方の側端
面と前記圧縮コイルプリングの間に介装された第２の耐
熱滑性の樹脂製ワッシャとを有して成ることを特徴とす
る摩擦式トルクリミッタ機構を備えたギアドモータ。6. A geared motor equipped with the friction type torque limiter mechanism according to claim 3, wherein the friction member has one end surface of the base side flange portion and one of the driving gears. A first heat-resistant slip resin washer interposed between the compression gear and the other side end surface of the driving gear, and a second heat-resistant slip resin washer interposed between the compression coil pulling. A geared motor having a friction type torque limiter mechanism, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20689095A JPH0956117A (en) | 1995-08-14 | 1995-08-14 | Gear motor with frictional torque limiter mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20689095A JPH0956117A (en) | 1995-08-14 | 1995-08-14 | Gear motor with frictional torque limiter mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0956117A true JPH0956117A (en) | 1997-02-25 |
Family
ID=16530753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20689095A Pending JPH0956117A (en) | 1995-08-14 | 1995-08-14 | Gear motor with frictional torque limiter mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0956117A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1162724A (en) * | 1997-06-24 | 1999-03-05 | Eaton Corp | Exhaust gas circulation device for internal combustion engine |
| US6364585B1 (en) | 1999-11-18 | 2002-04-02 | Nec Corporation | Torque-controllable screw with knob |
| US7348701B2 (en) * | 2003-12-27 | 2008-03-25 | Samsung Electronics Co., Ltd. | Driving unit and image forming apparatus |
-
1995
- 1995-08-14 JP JP20689095A patent/JPH0956117A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1162724A (en) * | 1997-06-24 | 1999-03-05 | Eaton Corp | Exhaust gas circulation device for internal combustion engine |
| US6364585B1 (en) | 1999-11-18 | 2002-04-02 | Nec Corporation | Torque-controllable screw with knob |
| US7348701B2 (en) * | 2003-12-27 | 2008-03-25 | Samsung Electronics Co., Ltd. | Driving unit and image forming apparatus |
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