JP5755668B2 - Torque limiter - Google Patents

Torque limiter Download PDF

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Publication number
JP5755668B2
JP5755668B2 JP2013012813A JP2013012813A JP5755668B2 JP 5755668 B2 JP5755668 B2 JP 5755668B2 JP 2013012813 A JP2013012813 A JP 2013012813A JP 2013012813 A JP2013012813 A JP 2013012813A JP 5755668 B2 JP5755668 B2 JP 5755668B2
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ring member
inner ring
torque limiter
outer ring
coil spring
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JP2014145380A (en
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太郎 磯部
太郎 磯部
俊一 渡邉
俊一 渡邉
勇 森本
勇 森本
晴日 井内
晴日 井内
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Origin Electric Co Ltd
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Origin Electric Co Ltd
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Priority to HK15100684.4A priority patent/HK1200204A1/en
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Description

本発明は、所定値以下のトルクは伝達し、所定値を超えるトルクの伝達は遮断するトルクリミッタに関する。   The present invention relates to a torque limiter that transmits torque less than a predetermined value and blocks transmission of torque exceeding a predetermined value.

一般に、トルクリミッタは、所定値を超える過大なトルクが作用したとき、その過大なトルクの伝達を遮断するものであり、例えば、ＯＡ機器などのプリンタや複写機の紙送り、搬送や排出部分の機構などに広く用いられている。   In general, when an excessive torque exceeding a predetermined value is applied, the torque limiter cuts off the transmission of the excessive torque. For example, the torque limiter cuts off the paper feeding, conveying and discharging portions of a printer such as an OA device or a copying machine. Widely used in mechanisms.

トルクリミッタには、機械的な摩擦によって回転トルクが得られる接触式のものがあり、接触式のトルクリミッタは、一般に、内輪部材、コイルバネ、外輪部材、シーリング部材の４部品で構成されている（特許文献１参照）。そして、内輪部材の外周にコイルバネを締まり嵌めして外輪部材に固定し、内輪部材とコイルバネとの機械的な摩擦によって所定値の回転トルクが得られるようにしている。また、通常、内輪部材は金属で形成されているが、樹脂で形成したトルクリミッタもある（例えば、特許文献２参照）   There is a contact type torque limiter that can obtain rotational torque by mechanical friction, and the contact type torque limiter is generally composed of four parts: an inner ring member, a coil spring, an outer ring member, and a sealing member ( Patent Document 1). A coil spring is tightly fitted on the outer periphery of the inner ring member and fixed to the outer ring member, and a predetermined rotational torque is obtained by mechanical friction between the inner ring member and the coil spring. Further, the inner ring member is usually made of metal, but there is also a torque limiter made of resin (for example, see Patent Document 2).

特開平１０−１１０７３９号公報Japanese Patent Laid-Open No. 10-110739 特開２０１２−９７７９８号公報JP 2012-97798 A

しかし、金属の内輪部材を用いたトルクリミッタでは、通常、鉄系焼結合金で内輪部材を形成しているので、コストが高く、成形上、ある程度の肉厚を必要とするため小型化（小径化）が難しい。   However, the torque limiter using a metal inner ring member is usually made of an iron-based sintered alloy, so the cost is high and a certain thickness is required for molding. Is difficult.

一方、樹脂の内輪部材を用いたトルクリミッタでは、耐摩耗性を維持するために、ＰＰＳ樹脂にカーボン（炭素繊維）を多量に添加したグレードの樹脂を使用する必要があり、コストアップに繋がる。   On the other hand, in a torque limiter using a resin inner ring member, it is necessary to use a grade resin in which a large amount of carbon (carbon fiber) is added to the PPS resin in order to maintain wear resistance, leading to an increase in cost.

本発明の目的は、内輪部材の小径化を図ることができ、しかも安価なトルクリミッタを提供することである。   An object of the present invention is to provide an inexpensive torque limiter that can reduce the diameter of an inner ring member.

本発明の請求項１に係る発明は、 金属をプレス成形して前段部の外径が後段部の外径より小さい２段階絞り形状で段差部が傾斜形状であり前記後段部の端部がラッパ状に形成された内輪部材と、前記内輪部材の外面との間で摩擦力を生じるよう前記前段部の外面に接して設けられたコイルバネと、前記内輪部材の外側に前記コイルバネを覆って前記内輪部材が突出しないように設けられ内周面で前記コイルバネの端部を係止するとともに前記内輪部材の２段階絞り形状の前記前段部及び前記後段部を支持し前記内輪部材のラッパ状の最大径部分と嵌合して前記内輪部材を固定する嵌合爪を有した外輪部材とを備えたことを特徴とする。 According to the first aspect of the present invention, a metal is press-molded, the outer diameter of the front stage is smaller than the outer diameter of the rear stage, and the step is inclined, and the end of the rear stage is a trumpet. an inner ring member formed on Jo, a coil spring provided in the contact outer surfaces of the front portion so as to produce a frictional force between the outer surface of the inner ring member, the inner ring to cover the coil spring on the outside of the inner ring member The inner ring member has a trumpet-shaped maximum diameter that is provided so that the member does not protrude and locks the end of the coil spring on the inner peripheral surface and supports the front and rear stages of the two-stage throttle shape of the inner ring member And an outer ring member having a fitting claw that is fitted to the portion and fixes the inner ring member.

本発明の請求項２に係る発明は、請求項１の発明において、前記内輪部材は、ＳＰＣＣ材をプレス成形し、窒化処理による表面硬化処理後にバレル研磨を施して形成することを特徴とする。 The invention according to claim 2 of the present invention is characterized in that, in the invention of claim 1, the inner ring member is formed by press-molding an SPCC material and barrel-polishing after surface hardening treatment by nitriding treatment .

本発明の請求項１の発明によれば、金属をプレス成形して内輪部材を形成するので、安価な鉄素材を使用することができる。また、内輪部材の前段部の外径が後段部の外径より小さい２段階絞り形状とするので、内輪部材を外輪部材の内周面の２箇所で支持でき、後段部の端部をラッパ状に形成するので、シールド部材が不要になる。   According to the first aspect of the present invention, since the inner ring member is formed by press forming a metal, an inexpensive iron material can be used. Moreover, since the outer diameter of the front stage part of the inner ring member is a two-stage throttle shape that is smaller than the outer diameter of the rear stage part, the inner ring member can be supported at two locations on the inner peripheral surface of the outer ring member, and the end part of the rear stage part has a trumpet shape. Therefore, a shield member is not necessary.

本発明の請求項２の発明によれば、請求項１の発明において、前記内輪部材は、ＳＰＣＣ材をプレス成形し、表面硬化処理後にバレル研磨を施して形成するので、耐摩耗性や摺動性等の耐久性を向上できる。   According to the second aspect of the present invention, in the first aspect of the invention, the inner ring member is formed by press-molding SPCC material and barrel-polishing after surface hardening treatment. The durability such as property can be improved.

本発明の実施形態に係るトルクリミッタの断面図。Sectional drawing of the torque limiter which concerns on embodiment of this invention. 本発明の実施形態に係るトルクリミッタの左側面図。The left view of the torque limiter which concerns on embodiment of this invention. 本発明の実施形態に係るトルクリミッタの右側面図。The right view of the torque limiter which concerns on embodiment of this invention. 本発明の実施形態に係るトルクリミッタの内輪部材の斜視図。The perspective view of the inner ring member of the torque limiter concerning the embodiment of the present invention. 本発明の実施形態に係るトルクリミッタの内輪部材を外輪部材に嵌合させた状態の斜視図。The perspective view of the state which made the inner ring member of the torque limiter concerning the embodiment of the present invention fit to the outer ring member.

以下、本発明の実施形態を説明する。図１は本発明の実施形態に係るトルクリミッタの断面図、図２は左側面図、図３は右側面図である。   Embodiments of the present invention will be described below. 1 is a cross-sectional view of a torque limiter according to an embodiment of the present invention, FIG. 2 is a left side view, and FIG. 3 is a right side view.

図１において、本発明の実施形態に係るトルクリミッタは、内輪部材１１、コイルバネ１２、外輪部材１３からなる。内輪部材１１は、金属をプレス成形して前段部１４の外径が後段部１５の外径より小さい２段階絞り形状に形成されている。前段部１４と後段部１５との段差部は傾斜形状である。また、後段部１５の端部はラッパ状に形成され、ラッパ状に広がったラッパ状部１６を有している。 In FIG. 1, the torque limiter according to the embodiment of the present invention includes an inner ring member 11, a coil spring 12, and an outer ring member 13. The inner ring member 11 is formed by press-molding metal into a two-stage drawn shape in which the outer diameter of the front stage part 14 is smaller than the outer diameter of the rear stage part 15. The step portion between the front step portion 14 and the rear step portion 15 has an inclined shape. Moreover, the edge part of the back | latter stage part 15 is formed in the trumpet shape, and has the trumpet-shaped part 16 extended in the trumpet shape.

また、内輪部材１１の前段部１４及び後段部１５は円筒状に形成され、不図示のシャフトを貫通させるための貫通孔１７及びシャフトの係合片と係合する係合穴１８を有している。シャフトが貫通孔１７に挿入されたとき、シャフトの係合片が係合穴１８に係合し、シャフトの回転が内輪部材１１に伝達されるように構成されている。   Further, the front stage part 14 and the rear stage part 15 of the inner ring member 11 are formed in a cylindrical shape, and have a through hole 17 for allowing a shaft (not shown) to pass therethrough and an engagement hole 18 for engaging with an engagement piece of the shaft. Yes. When the shaft is inserted into the through hole 17, the engagement piece of the shaft is engaged with the engagement hole 18, and the rotation of the shaft is transmitted to the inner ring member 11.

コイルバネ１２は、内輪部材１１の外面との間で摩擦力を生じるよう設けられる。すなわち、内輪部材１１の外径が小さい前段部１４の外面に接して設けられ、コイルバネ１２の端部は外輪部材１３の内周面の係止部１９で外輪部材１３に係止される。   The coil spring 12 is provided so as to generate a frictional force with the outer surface of the inner ring member 11. That is, the inner ring member 11 is provided in contact with the outer surface of the front stage portion 14 having a small outer diameter, and the end portion of the coil spring 12 is locked to the outer ring member 13 by the locking portion 19 on the inner peripheral surface of the outer ring member 13.

外輪部材１３は内輪部材１１の外側にコイルバネ１２を覆って前記内輪部材が突出しないように設けられ、前述したように、外輪部材１３の内周面の係止部１９でコイルバネ１２の端部を係止する。また、外輪部材１３の内周面と内輪部材１１の前段部１４の一部とが接して第１支持面２０となり、外輪部材１３の内周面と内輪部材１１の後段部１５の一部とが接して第２支持面２１となる。これにより、外輪部材１３は第１支持面２０と第２支持面２１との２箇所で内輪部材１１を支持することになり、外輪部材１３は内輪部材１１を安定して支持できる。 The outer ring member 13 is provided such that the inner ring member I covering the coil spring 12 on the outside of the inner ring member 11 does not protrude, as described above, the ends of the coil spring 12 at the engaging portion 19 of the inner peripheral surface of the outer ring member 13 Lock. Further, the inner peripheral surface of the outer ring member 13 and a part of the front step portion 14 of the inner ring member 11 come into contact with each other to form the first support surface 20, and the inner peripheral surface of the outer ring member 13 and a part of the rear step portion 15 of the inner ring member 11 Becomes the second support surface 21 in contact with each other. As a result, the outer ring member 13 supports the inner ring member 11 at two locations of the first support surface 20 and the second support surface 21, and the outer ring member 13 can stably support the inner ring member 11.

また、外輪部材１３は内輪部材１１のラッパ状部１６の最大径部分と嵌合して内輪部材１１を固定する嵌合爪２２を有している。このように、内輪部材１１のラッパ状部１６の最大径部分を嵌合爪２２により外輪部材１３に固定するのでシールド部材が不要になる。   Further, the outer ring member 13 has a fitting claw 22 that is fitted to the maximum diameter portion of the trumpet-shaped portion 16 of the inner ring member 11 and fixes the inner ring member 11. Thus, since the maximum diameter portion of the trumpet-shaped portion 16 of the inner ring member 11 is fixed to the outer ring member 13 by the fitting claws 22, no shield member is required.

また、外輪部材１３には、外輪部材１３を固定するための固定部２３が設けられており、この固定部２３は、トルクリミッタが装着される機器、例えば、プリンタや複写機の紙送り機構部に連結されて固定される。これにより、外輪部材１３は固定され、シャフトを貫通した内輪部材１１がコイルバネ１２と係合してトルクの伝達や遮断を行う。   Further, the outer ring member 13 is provided with a fixing portion 23 for fixing the outer ring member 13, and this fixing portion 23 is a device to which a torque limiter is attached, for example, a paper feed mechanism portion of a printer or a copying machine. To be fixed to. As a result, the outer ring member 13 is fixed, and the inner ring member 11 penetrating the shaft engages with the coil spring 12 to transmit and block torque.

そして、内輪部材１１と係合したシャフトの回転が所定値以下のときは、外輪部材１３の内周面の係止部１９に係止されたコイルバネ１２は、内輪部材１１の外面との間で摩擦力を生じてシャフトのトルクを伝達する。一方、シャフトの回転が所定値を超える過大なトルクであるときは、コイルバネ１２は内輪部材１１の外面との間でスリップしその過大なトルクの伝達を遮断する。   When the rotation of the shaft engaged with the inner ring member 11 is equal to or less than a predetermined value, the coil spring 12 locked to the locking portion 19 on the inner peripheral surface of the outer ring member 13 is between the outer surface of the inner ring member 11. Generates frictional force to transmit shaft torque. On the other hand, when the rotation of the shaft is an excessive torque exceeding a predetermined value, the coil spring 12 slips between the outer surface of the inner ring member 11 and interrupts the transmission of the excessive torque.

図２に示すように、本発明の実施形態に係るトルクリミッタの左側面部には、外輪部材１３を固定するための固定部２３が設けられており、この固定部２３は、トルクリミッタが装着される機器に連結されて固定される。また、図３に示すように、本発明の実施形態に係るトルクリミッタの右側面部には、貫通孔１７に挿入されるシャフトを係止するための係合穴１８を有しており、シャフトが貫通孔１７に挿入されたとき、シャフトの係合片が係合穴１８に係合して、シャフトの回転が内輪部材１１に伝達される。   As shown in FIG. 2, a fixing portion 23 for fixing the outer ring member 13 is provided on the left side surface portion of the torque limiter according to the embodiment of the present invention. The fixing portion 23 is mounted with a torque limiter. Connected and fixed to the device. Further, as shown in FIG. 3, the right side surface portion of the torque limiter according to the embodiment of the present invention has an engagement hole 18 for locking the shaft inserted into the through hole 17. When inserted into the through hole 17, the engagement piece of the shaft engages with the engagement hole 18, and the rotation of the shaft is transmitted to the inner ring member 11.

次に、図４は本発明の実施形態に係るトルクリミッタの内輪部材の斜視図である。前述したように、本発明の実施形態では、内輪部材１１は金属をプレス成形して形成される。プレス成形した金属製の内輪部材１１とすることにより、部品を薄肉化し小径化かつ低価格化を可能にしている。   Next, FIG. 4 is a perspective view of the inner ring member of the torque limiter according to the embodiment of the present invention. As described above, in the embodiment of the present invention, the inner ring member 11 is formed by press-molding metal. By using the press-molded metal inner ring member 11, the part can be thinned to reduce the diameter and the price.

一方、金属をプレス成形するには、プレス成形に適した金属（柔らかい金属）が望ましい。そこで、本発明の実施形態では、例えば、ＳＰＣＣ材（安価な鉄素材）を用いる。なお、内輪部材１１の耐久性を考慮すると、耐摩耗性や摺動性を向上させる必要があることから、窒化処理（表面硬化処理）後にバレル研磨を施し、表面の酸化層を除去して耐久性を向上させる。   On the other hand, in order to press form a metal, a metal (soft metal) suitable for press forming is desirable. Therefore, in the embodiment of the present invention, for example, an SPCC material (inexpensive iron material) is used. Considering the durability of the inner ring member 11, it is necessary to improve the wear resistance and slidability. Therefore, barrel polishing is performed after the nitriding treatment (surface hardening treatment) to remove the oxidized layer on the surface and the durability is improved. Improve sexiness.

さらに、本発明の実施形態では、耐久性向上のために、内輪部材１１にラジアル方向荷重や意図しない偏荷重が掛からないように、内輪部材１１の形状を前段部１４及び後段部１５の２段階絞り形状とし、外輪部材１３にて２箇所での支持構造としてトルクリミッタ性能が損なわれないようにした。   Furthermore, in the embodiment of the present invention, in order to improve durability, the inner ring member 11 is shaped in two stages of the front stage part 14 and the rear stage part 15 so that the inner ring member 11 is not subjected to a radial load or an unintended uneven load. The shape of the diaphragm is such that the torque limiter performance is not impaired as a support structure at two locations by the outer ring member 13.

また、後段部１５の端部をラッパ状に広がるラッパ状部１６を形成するとともに、ラッパ状部１６の最大径部分に切欠部２４を設け、外輪部材１３との嵌合を容易に行えるようにし、シールド部材を省略できるようにした。   In addition, a trumpet-shaped portion 16 is formed that widens the end of the rear-stage portion 15 in a trumpet shape, and a notch 24 is provided in the maximum diameter portion of the trumpet-shaped portion 16 so that the outer ring member 13 can be easily fitted. The shield member can be omitted.

図５は本発明の実施形態に係るトルクリミッタの内輪部材１１を外輪部材１３に嵌合させた状態の斜視図である。内輪部材１１を外輪部材１３に嵌合させるには、内輪部材１１の切欠部２４と外輪部材１３の嵌合爪２２とを位置あわせして、内輪部材１１を外輪部材１３に挿入し、その後に内輪部材１１を時計方向または反時計方向のいずれかの方向に回転させて嵌合爪２２にて内輪部材１１と外輪部材１３とを係止する。これにより、内輪部材１１が外輪部材１３から脱落することを防止できる。なお、切欠部２４は必ずしも設ける必要はない。外輪部材１３自体に可撓性を持たせておくと、内輪部材１１を外輪部材１３に嵌合させる際に、外輪部材１３の撓みによって、内輪部材１１のラッパ状部１６の最大径部分は外輪部材１３の内周面に嵌合できるからである。   FIG. 5 is a perspective view of a state in which the inner ring member 11 of the torque limiter according to the embodiment of the present invention is fitted to the outer ring member 13. In order to fit the inner ring member 11 to the outer ring member 13, the notch portion 24 of the inner ring member 11 and the fitting claw 22 of the outer ring member 13 are aligned, the inner ring member 11 is inserted into the outer ring member 13, and then The inner ring member 11 is rotated in either the clockwise direction or the counterclockwise direction, and the inner ring member 11 and the outer ring member 13 are locked by the fitting claws 22. Thereby, it is possible to prevent the inner ring member 11 from falling off the outer ring member 13. Note that the notch 24 is not necessarily provided. If the outer ring member 13 itself is flexible, when the inner ring member 11 is fitted to the outer ring member 13, the maximum diameter portion of the trumpet-shaped portion 16 of the inner ring member 11 is caused by the bending of the outer ring member 13. This is because it can be fitted to the inner peripheral surface of the member 13.

以上、本発明の実施形態を説明したが、この実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。この新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。この実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and is not intending limiting the range of invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

１１…内輪部材、１２…コイルバネ、１３…外輪部材、１４…前段部、１５…後段部、１６…ラッパ状部、１７…貫通孔、１８…係合穴、１９…係止部、２０…第１支持面、２１…第２支持面、２２…嵌合爪、２３…固定部、２４…切欠部 DESCRIPTION OF SYMBOLS 11 ... Inner ring member, 12 ... Coil spring, 13 ... Outer ring member, 14 ... Front stage part, 15 ... Rear stage part, 16 ... Trumpet-like part, 17 ... Through-hole, 18 ... Engagement hole, 19 ... Locking part, 20th DESCRIPTION OF SYMBOLS 1 Support surface, 21 ... 2nd support surface, 22 ... Fitting nail | claw, 23 ... Fixed part, 24 ... Notch part

Claims (2)

金属をプレス成形して前段部の外径が後段部の外径より小さい２段階絞り形状で段差部が傾斜形状であり前記後段部の端部がラッパ状に形成された内輪部材と、
前記内輪部材の外面との間で摩擦力を生じるよう前記前段部の外面に接して設けられたコイルバネと、
前記内輪部材の外側に前記コイルバネを覆って前記内輪部材が突出しないように設けられ内周面で前記コイルバネの端部を係止するとともに前記内輪部材の２段階絞り形状の前記前段部及び前記後段部を支持し前記内輪部材のラッパ状の最大径部分と嵌合して前記内輪部材を固定する嵌合爪を有した外輪部材とを備えたことを特徴とするトルクリミッタ。 An inner ring member in which a metal is press-molded and the outer diameter of the front stage is smaller than the outer diameter of the rear stage, the stepped part is inclined, and the end of the rear stage is formed in a trumpet shape;
A coil spring provided in contact with the outer surface of the front stage so as to generate a frictional force with the outer surface of the inner ring member;
The inner ring member is provided outside the inner ring member so that the inner ring member does not protrude so that the end of the coil spring is locked on the inner peripheral surface, and the two-stage throttle-shaped front stage part and the rear stage of the inner ring member A torque limiter comprising: an outer ring member having a fitting claw for supporting a portion and engaging with a trumpet-shaped maximum diameter portion of the inner ring member to fix the inner ring member. 前記内輪部材は、ＳＰＣＣ材をプレス成形し、窒化処理による表面硬化処理後にバレル研磨を施して形成することを特徴とする請求項１記載のトルクリミッタ。 2. The torque limiter according to claim 1, wherein the inner ring member is formed by press-molding an SPCC material and barrel-polishing after surface hardening treatment by nitriding treatment .
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JP2016176585A (en) * 2015-03-23 2016-10-06 コニカミノルタ株式会社 Torque limiter device and gear unit
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CN107420457A (en) * 2017-10-06 2017-12-01 东莞市松研智达工业设计有限公司 A kind of torque limiter of adjustable critical value
CN107620771A (en) * 2017-11-19 2018-01-23 东莞市松研智达工业设计有限公司 A kind of output speed does not change and the increased torque limiter of moment of torsion
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CN109973567A (en) * 2019-04-01 2019-07-05 上海杰邦塑料五金制品有限公司 A kind of torque limiter

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