JP2021095977A - Torque limiter - Google Patents

Torque limiter Download PDF

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JP2021095977A
JP2021095977A JP2019228822A JP2019228822A JP2021095977A JP 2021095977 A JP2021095977 A JP 2021095977A JP 2019228822 A JP2019228822 A JP 2019228822A JP 2019228822 A JP2019228822 A JP 2019228822A JP 2021095977 A JP2021095977 A JP 2021095977A
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outer ring
inner ring
coil spring
ring
torque limiter
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JP7010918B2 (en
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太郎 磯部
Taro Isobe
太郎 磯部
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Origin Co Ltd
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Abstract

To provide a new torque limiter in which a flange portion formed on an outer peripheral surface of an inner ring can sufficiently easily overcome an engaging portion formed on an inner peripheral surface of an outer ring, when inserting the inner ring in the inside of the outer ring.SOLUTION: An outer ring 8 is provided with an opening portion 38 corresponding to an engaging portion 34 and penetrating in a diametrical direction. On the inner side of the opening portion 38, a projecting piece 40 is arranged, which projects out in an axial direction from an inner peripheral edge of the outer ring 8 regulating the opening portion 38. The engaging portion 34 is provided on the projecting piece 40.SELECTED DRAWING: Figure 2

Description

本発明はコイルばねを用いたトルクリミッタに関する。 The present invention relates to a torque limiter using a coil spring.

下記特許文献1には、内輪と、前記内輪の外周面に接触して装着されるコイルばねと、前記コイルばねの装着された前記内輪が挿入される筒状の外輪とを備え、前記内輪及び前記外輪は共通の中心軸を有し、前記内輪には径方向外側に延出する円環形状のフランジが、前記外輪には径方向内側に突出する複数の係合部が夫々設けられ、前記コイルばねの装着された前記内輪が前記外輪の内側に挿入されると、前記フランジ部は前記係合部を乗り越えて前記係合部と軸方向に係合すると共に、前記コイルばねは前記外輪に対して回転不能に係合し、前記内輪と前記外輪とを相対的に回転させる前記中心軸周りの回転トルクが付加されたときは、前記回転トルクが所定値より大きい場合に、前記コイルばねと前記内輪との間の摩擦力に打ち勝って前記外輪と前記内輪とが相対的に回転するトルクリミッタが開示されている。 The following Patent Document 1 includes an inner ring, a coil spring mounted in contact with the outer peripheral surface of the inner ring, and a tubular outer ring into which the inner ring mounted with the coil spring is inserted. The outer ring has a common central axis, the inner ring is provided with an annular flange extending radially outward, and the outer ring is provided with a plurality of engaging portions extending radially inward. When the inner ring to which the coil spring is mounted is inserted inside the outer ring, the flange portion gets over the engaging portion and engages with the engaging portion in the axial direction, and the coil spring is attached to the outer ring. When a rotational torque around the central axis that irrevocably engages with the inner ring and relatively rotates the inner ring and the outer ring is applied, when the rotational torque is larger than a predetermined value, the coil spring and the coil spring A torque limiter is disclosed in which the outer ring and the inner ring rotate relative to each other by overcoming the frictional force between the inner ring.

特許第4668706号公報Japanese Patent No. 46668706

しかしながら、上記特許文献1に開示されたトルクリミッタにあっては、内輪が外輪の内側に挿入されて両者が組み合される際に、フランジ部が係合部を乗り越えるのに比較的大きな力を要し、組み立て性が充分良好なものではなかった。さらに、フランジ部が係合部を乗り越える際に大きな力を付加した場合には、フランジ部及び係合部のいずれか一方又はその両方が損傷し、内輪と外輪とが軸方向に係合不能となる虞もある。 However, in the torque limiter disclosed in Patent Document 1, when the inner ring is inserted inside the outer ring and the two are combined, a relatively large force is required for the flange portion to get over the engaging portion. , The assembleability was not good enough. Further, when a large force is applied when the flange portion gets over the engaging portion, one or both of the flange portion and the engaging portion is damaged, and the inner ring and the outer ring cannot be engaged in the axial direction. There is also a risk of becoming.

本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、内輪を外輪の内側に挿入する際に、内輪の外周面に形成されたフランジ部が充分容易に外輪の内周面に形成された係合部を乗り越えることができる、新規且つ改良されたトルクリミッタを提供することである。 The present invention has been made in view of the above facts, and the main technical problem thereof is that when the inner ring is inserted into the inner ring, the flange portion formed on the outer peripheral surface of the inner ring is sufficiently easily formed on the inner circumference of the outer ring. It is to provide a new and improved torque limiter that can overcome the engagement portion formed on the surface.

本発明者は、鋭意検討の結果、係合部に対応して径方向に貫通した開口部を外輪に設け、開口部の内側には、開口部を規定する外輪の内周縁から軸方向に突出する突出片を配設し、この突出片に係合部を設けることで、上記主たる技術的課題を解決することができることを見出した。 As a result of diligent studies, the present inventor has provided an opening in the outer ring that penetrates in the radial direction corresponding to the engaging portion, and the inside of the opening projects axially from the inner peripheral edge of the outer ring that defines the opening. It has been found that the above-mentioned main technical problem can be solved by disposing the projecting piece to be provided and providing an engaging portion on the projecting piece.

即ち、本発明によれば、上記主たる技術的課題を解決することができるトルクリミッタとして、内輪と、前記内輪の外周面に接触して装着されるコイルばねと、前記コイルばねの装着された前記内輪が挿入される筒状の外輪とを備え、
前記内輪及び前記外輪は共通の中心軸を有し、前記内輪には径方向外側に延出する円環形状のフランジが、前記外輪には径方向内側に突出する複数の係合部が夫々設けられ、
前記コイルばねの装着された前記内輪が前記外輪の内側に挿入されると、前記フランジ部は前記係合部を乗り越えて前記係合部と軸方向に係合すると共に、前記コイルばねは前記外輪に対して回転不能に係合し、
前記内輪と前記外輪とを相対的に回転させる前記中心軸周りの回転トルクが付加されたときは、前記回転トルクが所定値より大きい場合に、前記コイルばねと前記内輪との間の摩擦力に打ち勝って前記外輪と前記内輪とが相対的に回転するトルクリミッタにおいて、
前記外輪は前記係合部に対応して径方向に貫通した開口部を備え、前記開口部の内側には、前記開口部を規定する前記外輪の内周縁から軸方向に突出する突出片が設けられており、前記係合部は前記突出片に形成されている、ことを特徴とするトルクリミッタが提供される。
That is, according to the present invention, as a torque limiter capable of solving the main technical problem, an inner ring, a coil spring mounted in contact with the outer peripheral surface of the inner ring, and the coil spring mounted. Equipped with a tubular outer ring into which the inner ring is inserted,
The inner ring and the outer ring have a common central axis, the inner ring is provided with an annular flange extending radially outward, and the outer ring is provided with a plurality of engaging portions extending radially inward. Be,
When the inner ring to which the coil spring is mounted is inserted inside the outer ring, the flange portion gets over the engaging portion and engages with the engaging portion in the axial direction, and the coil spring is attached to the outer ring. Engages non-rotatably against
When a rotational torque around the central axis that relatively rotates the inner ring and the outer ring is applied, when the rotational torque is larger than a predetermined value, the frictional force between the coil spring and the inner ring is applied. In a torque limiter in which the outer ring and the inner ring rotate relative to each other
The outer ring is provided with an opening that penetrates in the radial direction corresponding to the engaging portion, and inside the opening, a protruding piece that projects axially from the inner peripheral edge of the outer ring that defines the opening is provided. A torque limiter is provided, wherein the engaging portion is formed on the protruding piece.

好ましくは、前記外輪における、前記開口部が形成された周方向角度領域には、径方向肉厚を低減せしめた薄肉部が形成されている。前記フランジ部及び前記係合部のいずれか一方又はその両方には、乗り越え案内手段が設けられているのが好ましい。好適には、前記外輪には前記内輪の軸方向端部を回転可能に支持する軸受け部が設けられている。前記外輪の内側には潤滑剤が封入されているのがよい。 Preferably, in the outer ring, a thin wall portion having a reduced radial wall thickness is formed in the circumferential angle region where the opening is formed. It is preferable that one or both of the flange portion and the engaging portion is provided with an overcoming guide means. Preferably, the outer ring is provided with a bearing portion that rotatably supports the axial end portion of the inner ring. It is preferable that a lubricant is sealed inside the outer ring.

本発明のトルクリミッタにおいては、外輪は係合部に対応して径方向に貫通した開口部を備え、開口部の内側には、開口部を規定する外輪の内周縁から軸方向に突出する突出片が設けられ、係合部は突出片に形成されている。これにより、突出片が撓むことで係合部は径方向へ弾性的に変位可能となるため、内輪を外輪の内側に挿入する際に、内輪の外周面に形成されたフランジ部は充分容易に外輪の内周面に形成された係合部を乗り越えることができる。 In the torque limiter of the present invention, the outer ring is provided with an opening that penetrates in the radial direction corresponding to the engaging portion, and inside the opening, a protrusion that projects axially from the inner peripheral edge of the outer ring that defines the opening. A piece is provided, and the engaging portion is formed on a protruding piece. As a result, the engaging portion can be elastically displaced in the radial direction by bending the protruding piece, so that when the inner ring is inserted into the inner ring, the flange portion formed on the outer peripheral surface of the inner ring is sufficiently easy. It is possible to get over the engaging portion formed on the inner peripheral surface of the outer ring.

本発明に従って構成されたトルクリミッタの全体構造を示す図。The figure which shows the whole structure of the torque limiter configured according to this invention. 図1に示すトルクリミッタ分解斜視図。FIG. 1 is an exploded perspective view of the torque limiter shown in FIG. 図1に示すトルクリミッタの内輪を単体で示す図。The figure which shows the inner ring of the torque limiter shown in FIG. 1 by itself. 図1に示すトルクリミッタの外輪を単体で示す。The outer ring of the torque limiter shown in FIG. 1 is shown as a single unit.

以下、本発明に従って構成されたトルクリミッタの好適実施形態を図示している添付図面を参照して、更に詳細に説明する。 Hereinafter, the torque limiter configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating preferred embodiments of the torque limiter.

図1及び図2を参照して説明すると、本発明に従って構成された、全体を番号2で示すトルクリミッタは、内輪4と、コイルばね6と、外輪8とを備えている。 Explaining with reference to FIGS. 1 and 2, the torque limiter, which is configured according to the present invention and is indicated by No. 2 as a whole, includes an inner ring 4, a coil spring 6, and an outer ring 8.

図1及び図2と共に図3を参照して説明すると、内輪4は金属製であって円筒形状の内輪主部10を備えている。内輪主部10の軸方向中間部には、円環形状のフランジ部12が設けられており、内輪主部10は、フランジ部12よりも軸方向片側の接続領域14と、軸方向他側の装着領域16とに区画されている。内輪4の軸方向片端部(つまり接続領域14の軸方向外側端部)には、軸方向外側に向かって開放された切り欠き18が180度の角度間隔をおいて2つ設けられており、この切り欠き18を介して内輪4は入力側の外部機器に接続される。フランジ部12は内輪主部10の外周面から径方向外側に向かって、軸方向に対して垂直に延出している。フランジ部12の軸方向他側面(即ち、軸方向に見て、切り欠き18が形成された側とは反対側の面)の外周縁部には、面取り部20(乗り越え案内手段)が周方向に連続して形成されている。 Explaining with reference to FIG. 3 together with FIGS. 1 and 2, the inner ring 4 is made of metal and includes a cylindrical inner ring main portion 10. An annular flange portion 12 is provided in the axially intermediate portion of the inner ring main portion 10, and the inner ring main portion 10 has a connection region 14 on one side in the axial direction and the other side in the axial direction with respect to the flange portion 12. It is divided into a mounting area 16. Two notches 18 opened toward the outside in the axial direction are provided at one end in the axial direction of the inner ring 4 (that is, the outer end in the axial direction of the connection region 14) at an angular interval of 180 degrees. The inner ring 4 is connected to an external device on the input side via the notch 18. The flange portion 12 extends radially outward from the outer peripheral surface of the inner ring main portion 10 in a direction perpendicular to the axial direction. A chamfered portion 20 (overcoming guidance means) is provided in the circumferential direction on the outer peripheral edge of the flange portion 12 on the other side surface in the axial direction (that is, the surface opposite to the side on which the notch 18 is formed when viewed in the axial direction). It is continuously formed in.

図1に示すとおり、コイルばね6は、内輪主部10(さらに詳しくは、その装着領域16)の外周面に装着される。図1と共に図2を参照することによって理解されるとおり、コイルばね6は金属製の線材をらせん状に巻回することによって形成され、その主部は軸方向に見て円形である。コイルばね6の軸方向片端には、上記線材を径方向外側に向かって屈曲させたフック部22が設けられている。コイルばね6の自由状態における内径は、内輪4の内輪主部10の外径よりも小さい。そのため、コイルばね6を内輪4の外周面に装着させるには、最初に、コイルばね6が緩む方向にフック部22を押圧してコイルばね6を拡径し、次いで、拡径された状態のコイルばね6の内側に内輪4を挿通して装着領域16をコイルばね6の内側に配置させ、その後にコイルばね6の上記拡径を解除する。かくしてコイルばね6は装着領域16において内輪主部10の外周面に密着し、内輪4に装着される。 As shown in FIG. 1, the coil spring 6 is mounted on the outer peripheral surface of the inner ring main portion 10 (more specifically, the mounting region 16 thereof). As understood by referring to FIG. 2 together with FIG. 1, the coil spring 6 is formed by spirally winding a metal wire, and its main portion is circular when viewed in the axial direction. At one end of the coil spring 6 in the axial direction, a hook portion 22 in which the wire rod is bent outward in the radial direction is provided. The inner diameter of the coil spring 6 in the free state is smaller than the outer diameter of the inner ring main portion 10 of the inner ring 4. Therefore, in order to mount the coil spring 6 on the outer peripheral surface of the inner ring 4, first, the hook portion 22 is pressed in the direction in which the coil spring 6 is loosened to expand the diameter of the coil spring 6, and then the diameter of the coil spring 6 is expanded. The inner ring 4 is inserted inside the coil spring 6 to arrange the mounting region 16 inside the coil spring 6, and then the diameter expansion of the coil spring 6 is released. Thus, the coil spring 6 comes into close contact with the outer peripheral surface of the inner ring main portion 10 in the mounting region 16 and is mounted on the inner ring 4.

図1に示す通り、外輪8はコイルばね6が装着された内輪4の外側に配置される。図1及び図2と共に図4を参照して説明すると、外輪8は合成樹脂製であって円筒形状の外輪主部24を備えている。外輪主部24の軸方向片端部の内周面には径方向内側に延出する円環形状の端板26が形成されている。端板26は、外輪主部24の内周面から径方向内側に向かって直線状に延出した後に、軸方向外側に向かって直線状に延出し、その後に再度径方向内側に向かって直線状に延出しており、端板26の径方向内側には、内輪4の軸方向端部を回転可能に支持する円環形状の軸受け部28が設けられている。外輪主部24及び端板26の軸方向外側面には、両者に跨って軸方向外側に向かって突出する接続片30が周方向に180度の角度間隔をおいて2つ設けられており、この接続片30を介して外輪8は出力側の外部機器に接続される。外輪主部24の軸方向他端部(即ち、軸方向に見て、端板26が形成されている側とは反対側の端部)には、コイルばね6のフック部22が挿入されるフック溝32が形成されている。フック溝32は、径方向に貫通して軸方向に直線状に延びている。フック溝32の軸方向他端は開放されている。外輪主部24の軸方向他端部にはさらに、その内周面において径方向内側に突出する複数(図示の実施形態においては、周方向に等角度間隔をおいて3個)の係合部34が設けられている。係合部34の軸方向外側部分には、面取り部36(乗り越え案内手段)が周方向に連続して形成されている。 As shown in FIG. 1, the outer ring 8 is arranged outside the inner ring 4 to which the coil spring 6 is mounted. Explaining with reference to FIG. 4 together with FIGS. 1 and 2, the outer ring 8 is made of synthetic resin and includes a cylindrical outer ring main portion 24. An annular end plate 26 extending inward in the radial direction is formed on the inner peripheral surface of one end of the outer ring main portion 24 in the axial direction. The end plate 26 extends linearly inward in the radial direction from the inner peripheral surface of the outer ring main portion 24, then linearly extends outward in the axial direction, and then straightly extends inward in the radial direction again. An annular bearing portion 28 that rotatably supports the axial end portion of the inner ring 4 is provided inside the end plate 26 in the radial direction. Two connecting pieces 30 straddling the outer ring main portion 24 and the end plate 26 in the axial direction and projecting outward in the axial direction are provided at an angular interval of 180 degrees in the circumferential direction. The outer ring 8 is connected to an external device on the output side via the connection piece 30. The hook portion 22 of the coil spring 6 is inserted into the other end of the outer ring main portion 24 in the axial direction (that is, the end portion on the side opposite to the side on which the end plate 26 is formed when viewed in the axial direction). The hook groove 32 is formed. The hook groove 32 penetrates in the radial direction and extends linearly in the axial direction. The other end of the hook groove 32 in the axial direction is open. At the other end of the outer ring main portion 24 in the axial direction, a plurality of engaging portions (three at equal angular intervals in the circumferential direction in the illustrated embodiment) projecting inward in the radial direction on the inner peripheral surface thereof. 34 is provided. A chamfered portion 36 (overcoming guide means) is continuously formed in the circumferential direction on the axially outer portion of the engaging portion 34.

本発明のトルクリミッタにおいては、外輪8は係合部34に対応して径方向に貫通した開口部38を備えている。図示の実施形態においては、開口部38は周方向に等角度間隔をおいて3個形成されており、外輪主部24の軸方向他端部(即ち、軸方向に見て、端板26が形成されている側とは反対側の端部)に夫々配置されている。開口部38は側面視において矩形形状であり、軸方向他端は開放されている。開口部38の内側には、開口部38を規定する外輪8の内周縁から軸方向に突出する突出片40が設けられている。突出片40は開口部38を規定する外輪8の内周縁から軸方向外側(つまり軸方向他側)に向かって直線状に突出しており、突出片40の周方向両側縁は開口部38を規定する外輪8の内周縁から離隔している。つまり、突出片40は、軸方向片側が固定端であって軸方向他側が自由端である片持ち状の板片であって、
これは固定端を基端として径方向へ弾性的に変位可能である。図示の実施形態においては、開口部38の軸方向他端は開放されていたがこれは閉塞されていてもよく、この場合には、突出片が閉塞された軸方向他端から軸方向内側(つまり軸方向片側)に向かって突出するようにすることもできる。いずれの場合であっても、突出片の、軸方向一方は固定端であるのに対し軸方向他方は自由端であり、周方向両側縁は開口部を規定する外輪の内周縁から離隔する。そして、この突出片40の軸方向先端部の内周面に係合部34が形成されている。図示の実施形態においては、外輪8における、開口部38が形成された周方向角度領域には、径方向肉厚を低減せしめた薄肉部42が形成されている。薄肉部42は外輪主部24の内径を局部的に増大させることによって形成され、軸方向に見て、端板26と係合部34との間の領域全域に亘って設けられている。従って、突出片40も薄肉にせしめられている。
In the torque limiter of the present invention, the outer ring 8 includes an opening 38 that penetrates in the radial direction corresponding to the engaging portion 34. In the illustrated embodiment, three openings 38 are formed at equal angular intervals in the circumferential direction, and the other end portion of the outer ring main portion 24 in the axial direction (that is, the end plate 26 when viewed in the axial direction) is formed. It is arranged at the end opposite to the formed side). The opening 38 has a rectangular shape in a side view, and the other end in the axial direction is open. Inside the opening 38, a protruding piece 40 that projects axially from the inner peripheral edge of the outer ring 8 that defines the opening 38 is provided. The protruding piece 40 projects linearly from the inner peripheral edge of the outer ring 8 that defines the opening 38 toward the outside in the axial direction (that is, the other side in the axial direction), and the circumferential edges of the protruding piece 40 define the opening 38. It is separated from the inner peripheral edge of the outer ring 8. That is, the protruding piece 40 is a cantilever plate piece having a fixed end on one side in the axial direction and a free end on the other side in the axial direction.
It can be elastically displaced in the radial direction with the fixed end as the base end. In the illustrated embodiment, the other end of the opening 38 in the axial direction was open, but this may be closed. In this case, the protruding piece is closed from the other end in the axial direction to the inside in the axial direction (in this case). That is, it can be made to protrude toward one side in the axial direction). In either case, one of the protruding pieces in the axial direction is a fixed end, while the other in the axial direction is a free end, and both sides in the circumferential direction are separated from the inner peripheral edge of the outer ring that defines the opening. An engaging portion 34 is formed on the inner peripheral surface of the axial tip portion of the protruding piece 40. In the illustrated embodiment, in the outer ring 8, a thin wall portion 42 having a reduced radial wall thickness is formed in the circumferential angle region where the opening 38 is formed. The thin-walled portion 42 is formed by locally increasing the inner diameter of the outer ring main portion 24, and is provided over the entire region between the end plate 26 and the engaging portion 34 when viewed in the axial direction. Therefore, the protruding piece 40 is also made thin.

上述した外輪8とコイルばね6が装着された内輪4とを組み合わせるには、コイルばね6のフック部22と外輪8のフック溝32とを整合させた状態で、コイルばね6が装着された内輪4を外輪8の内側に挿入させる。内輪4は、その装着領域16が区画された側から、外輪8の内側に進入させる。その際、外輪8の内側にはグリスの如き適宜の潤滑材を封入しておくのがよい。コイルばね6の装着された内輪4が外輪8の内側に挿入されると、フランジ部12は係合部34を乗り越えてこれと軸方向に係合すると共に、コイルばね6は外輪8に対して回転不能に係合する。 In order to combine the outer ring 8 and the inner ring 4 to which the coil spring 6 is mounted, the inner ring to which the coil spring 6 is mounted is in a state where the hook portion 22 of the coil spring 6 and the hook groove 32 of the outer ring 8 are aligned. 4 is inserted inside the outer ring 8. The inner ring 4 is made to enter the inside of the outer ring 8 from the side where the mounting area 16 is partitioned. At that time, it is preferable to enclose an appropriate lubricating material such as grease inside the outer ring 8. When the inner ring 4 to which the coil spring 6 is mounted is inserted inside the outer ring 8, the flange portion 12 gets over the engaging portion 34 and engages with the engaging portion 34 in the axial direction, and the coil spring 6 with respect to the outer ring 8. Engage non-rotatably.

本発明のトルクリミッタにおいては、外輪8は係合部34に対応して径方向に貫通した開口部38を備え、開口部38の内側には、開口部38を規定する外輪8の内周縁から軸方向に突出する突出片40が設けられ、係合部34は突出片40に形成されている。これにより、突出片40が撓むことで係合部34は径方向へ弾性的に変位可能となるため、内輪4を外輪8の内側に挿入する際に、内輪4の外周面に形成されたフランジ部12は充分容易に外輪8の内周面に形成された係合部34を乗り越えることができる。図示の実施形態においては、フランジ部12及び係合部34には、乗り越え案内手段(面取り部20及び36)が設けられていることに起因して、フランジ部12はより一層円滑に係合部34を乗り越えることができる。図示の実施形態においては更に、外輪8における、開口部38が形成された周方向角度領域には、径方向肉厚を低減せしめた薄肉部42が形成されていることに起因して、外輪8は、係合部34が形成されている周方向角度領域において剛性が低減し、フランジ部12はより一層円滑に係合部34を乗り越えることができる。 In the torque limiter of the present invention, the outer ring 8 is provided with an opening 38 that penetrates in the radial direction corresponding to the engaging portion 34, and the inside of the opening 38 is from the inner peripheral edge of the outer ring 8 that defines the opening 38. A protruding piece 40 projecting in the axial direction is provided, and the engaging portion 34 is formed on the protruding piece 40. As a result, the engaging portion 34 can be elastically displaced in the radial direction by bending the protruding piece 40, so that the engaging portion 34 is formed on the outer peripheral surface of the inner ring 4 when the inner ring 4 is inserted inside the outer ring 8. The flange portion 12 can easily get over the engaging portion 34 formed on the inner peripheral surface of the outer ring 8. In the illustrated embodiment, the flange portion 12 and the engaging portion 34 are provided with the overcoming guide means (chamfered portions 20 and 36), so that the flange portion 12 is more smoothly engaged. You can get over 34. Further, in the illustrated embodiment, the outer ring 8 is further formed with a thin wall portion 42 having a reduced radial wall thickness in the circumferential angle region where the opening 38 is formed. In the circumferential angle region where the engaging portion 34 is formed, the rigidity is reduced, and the flange portion 12 can get over the engaging portion 34 more smoothly.

内輪4のフランジ部12が外輪8の係合部34を乗り越えたのと同時もしくはその直後に、内輪4の軸方向先端部が外輪8に設けられた軸受け部28に進入して、内輪4の軸方向先端が外輪8の端板26と当接する。そして、内輪4の軸方向先端部は軸受け部28によって回転可能に支持される。これにより、内輪4は、外輪8の内側において、これに対して回転可能な状態で軸方向に位置決めされる。 At the same time as or immediately after the flange portion 12 of the inner ring 4 gets over the engaging portion 34 of the outer ring 8, the axial tip portion of the inner ring 4 enters the bearing portion 28 provided on the outer ring 8 to enter the bearing portion 28 of the inner ring 4. The axial tip comes into contact with the end plate 26 of the outer ring 8. Then, the axial tip portion of the inner ring 4 is rotatably supported by the bearing portion 28. As a result, the inner ring 4 is positioned in the axial direction inside the outer ring 8 in a rotatable state with respect to the inner ring 8.

続いて、図1を参照してトルクリミッタ2の作動について説明する。
内輪4と外輪8とを相対的に回転させる中心軸oの軸周りに所定値よりも大きい回転トルク、つまり空転トルクが、コイルばね6の内輪4への巻き付けを緩める方向に付加されると、コイルばね6の締付力によるコイルばね6と内輪4との間の摩擦力に打ち勝ち、外輪8と内輪4とが相対的に回転する。このとき、図1のB−B断面を参照することによって理解される通り、薄肉部42は所謂グリスポケットとしても作用し、外輪8の内側に封入された潤滑剤はコイルばね6に効率よく供給されることとなる。一方、空転トルク以下であれば、内輪4とコイルばね6との間の摩擦力により、相対的な回転は生じない。
Subsequently, the operation of the torque limiter 2 will be described with reference to FIG.
When a rotational torque larger than a predetermined value, that is, idling torque, is applied around the axis of the central axis o that relatively rotates the inner ring 4 and the outer ring 8 in a direction that loosens the winding of the coil spring 6 around the inner ring 4. The frictional force between the coil spring 6 and the inner ring 4 due to the tightening force of the coil spring 6 is overcome, and the outer ring 8 and the inner ring 4 rotate relatively. At this time, as understood by referring to the BB cross section of FIG. 1, the thin-walled portion 42 also acts as a so-called grease pocket, and the lubricant sealed inside the outer ring 8 is efficiently supplied to the coil spring 6. Will be done. On the other hand, if it is equal to or less than the idling torque, relative rotation does not occur due to the frictional force between the inner ring 4 and the coil spring 6.

以上添付した図面を参照して本発明のトルクリミッタ2について詳述したが、本発明は上述した実施形態に限定されるものではなく、本発明を逸脱しない範囲内で種々の変更が可能である。例えば、上述したトルクリミッタ2では、コイルばね6は単一のフック部22を有し、コイルばね6が緩む方向は周方向一方のみに限定されていることから、トルクリミッタ2はいわば一方向トルクリミッタであったが、本発明はこの形式に限定されるものではなく、本発明を、例えば本願の出願人によって先に特許出願されて既に特許された特許第3315603号公報や、同じく本願の出願人によって先に特許出願された特開2002−155973号公報で開示された双方向トルクリミッタに適用することもできる。また、図示の実施形態においては、内輪4が入力側の外部機器に、外輪8が出力側の外部機器に夫々接続されているとしたが、入出力関係は反対であってもよい。 Although the torque limiter 2 of the present invention has been described in detail with reference to the drawings attached above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the present invention. .. For example, in the torque limiter 2 described above, the coil spring 6 has a single hook portion 22, and the loosening direction of the coil spring 6 is limited to only one of the circumferential directions. Therefore, the torque limiter 2 is a so-called unidirectional torque. Although it was a limiter, the present invention is not limited to this form, and the present invention can be applied to, for example, Japanese Patent No. 3315603, which has been previously patented by the applicant of the present application, and the same application of the present application. It can also be applied to the bidirectional torque limiter disclosed in Japanese Patent Application Laid-Open No. 2002-155973, which was previously applied for a patent by a person. Further, in the illustrated embodiment, the inner ring 4 is connected to the external device on the input side and the outer ring 8 is connected to the external device on the output side, respectively, but the input / output relationship may be opposite.

2:トルクリミッタ
4:内輪
6:コイルばね
8:外輪
12:フランジ部
34:係合部
38:開口部
40:突出片
42:薄肉部
2: Torque limiter 4: Inner ring 6: Coil spring 8: Outer ring 12: Flange part 34: Engagement part 38: Opening 40: Protruding piece 42: Thin wall part

Claims (5)

内輪と、前記内輪の外周面に接触して装着されるコイルばねと、前記コイルばねの装着された前記内輪が挿入される筒状の外輪とを備え、
前記内輪及び前記外輪は共通の中心軸を有し、前記内輪には径方向外側に延出する円環形状のフランジが、前記外輪には径方向内側に突出する複数の係合部が夫々設けられ、
前記コイルばねの装着された前記内輪が前記外輪の内側に挿入されると、前記フランジ部は前記係合部を乗り越えて前記係合部と軸方向に係合すると共に、前記コイルばねは前記外輪に対して回転不能に係合し、
前記内輪と前記外輪とを相対的に回転させる前記中心軸周りの回転トルクが付加されたときは、前記回転トルクが所定値より大きい場合に、前記コイルばねと前記内輪との間の摩擦力に打ち勝って前記外輪と前記内輪とが相対的に回転するトルクリミッタにおいて、
前記外輪は前記係合部に対応して径方向に貫通した開口部を備え、前記開口部の内側には、前記開口部を規定する前記外輪の内周縁から軸方向に突出する突出片が設けられており、前記係合部は前記突出片に形成されている、ことを特徴とするトルクリミッタ。
It includes an inner ring, a coil spring mounted in contact with the outer peripheral surface of the inner ring, and a tubular outer ring into which the inner ring mounted with the coil spring is inserted.
The inner ring and the outer ring have a common central axis, the inner ring is provided with an annular flange extending radially outward, and the outer ring is provided with a plurality of engaging portions extending radially inward. Be,
When the inner ring to which the coil spring is mounted is inserted inside the outer ring, the flange portion gets over the engaging portion and engages with the engaging portion in the axial direction, and the coil spring is attached to the outer ring. Engages non-rotatably against
When a rotational torque around the central axis that relatively rotates the inner ring and the outer ring is applied, when the rotational torque is larger than a predetermined value, the frictional force between the coil spring and the inner ring is applied. In a torque limiter in which the outer ring and the inner ring rotate relative to each other
The outer ring is provided with an opening that penetrates in the radial direction corresponding to the engaging portion, and inside the opening, a protruding piece that projects axially from the inner peripheral edge of the outer ring that defines the opening is provided. The torque limiter is characterized in that the engaging portion is formed on the protruding piece.
前記外輪における、前記開口部が形成された周方向角度領域には、径方向肉厚を低減せしめた薄肉部が形成されている、請求項1に記載のトルクリミッタ。 The torque limiter according to claim 1, wherein a thin wall portion having a reduced radial wall thickness is formed in the circumferential angle region where the opening is formed in the outer ring. 前記フランジ部及び前記係合部のいずれか一方又はその両方には、乗り越え案内手段が設けられている、請求項1又は2に記載のトルクリミッタ。 The torque limiter according to claim 1 or 2, wherein an overcoming guide means is provided on either one or both of the flange portion and the engaging portion. 前記外輪には前記内輪の軸方向端部を回転可能に支持する軸受け部が設けられている、請求項1乃至3のいずれかに記載のトルクリミッタ。 The torque limiter according to any one of claims 1 to 3, wherein the outer ring is provided with a bearing portion that rotatably supports the axial end portion of the inner ring. 前記外輪の内側には潤滑剤が封入されている、請求項1乃至4のいずれかに記載のトルクリミッタ。 The torque limiter according to any one of claims 1 to 4, wherein a lubricant is sealed inside the outer ring.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11311261A (en) * 1998-04-24 1999-11-09 Nifco Inc Torque limiter
JP2006316861A (en) * 2005-05-11 2006-11-24 Yamauchi Corp Torque limiter
JP2007269457A (en) * 2006-03-31 2007-10-18 Dainippon Printing Co Ltd Winding frame
JP4668706B2 (en) * 2005-07-04 2011-04-13 オリジン電気株式会社 Torque goods
JP2018194092A (en) * 2017-05-18 2018-12-06 南真化学工業株式会社 Bidirectional torque limiter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11311261A (en) * 1998-04-24 1999-11-09 Nifco Inc Torque limiter
JP2006316861A (en) * 2005-05-11 2006-11-24 Yamauchi Corp Torque limiter
JP4668706B2 (en) * 2005-07-04 2011-04-13 オリジン電気株式会社 Torque goods
JP2007269457A (en) * 2006-03-31 2007-10-18 Dainippon Printing Co Ltd Winding frame
JP2018194092A (en) * 2017-05-18 2018-12-06 南真化学工業株式会社 Bidirectional torque limiter

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