JP5195162B2 - Torque limiter - Google Patents

Torque limiter Download PDF

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JP5195162B2
JP5195162B2 JP2008218359A JP2008218359A JP5195162B2 JP 5195162 B2 JP5195162 B2 JP 5195162B2 JP 2008218359 A JP2008218359 A JP 2008218359A JP 2008218359 A JP2008218359 A JP 2008218359A JP 5195162 B2 JP5195162 B2 JP 5195162B2
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hole
locking portion
state
shear valve
cover member
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JP2010053929A (en
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彰英 永山
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JTEKT Corp
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Description

本発明は、トルクリミッタに関する。   The present invention relates to a torque limiter.

従来、トルクリミッタとしては、特開昭６２−１５９８１５号公報（特許文献１）に記載されているものがある。このトルクリミッタは、軸部材の外周面に筒部材の内周面を外嵌し、筒部材の油圧拡張室に圧油を供給し、その油圧拡張室の圧油で筒部材の内周面を縮径してその内周面を軸部材の外周面に押し付けて、軸部材と筒部材とを摩擦結合してトルクを伝達するようになっている。このトルクリミッタは、上記軸部材の係止部を、油圧拡張室に一端部が連通しているシャーバルブの他端部に係止している。   Conventional torque limiters include those described in Japanese Patent Application Laid-Open No. 62-159815 (Patent Document 1). In this torque limiter, the inner peripheral surface of the cylindrical member is fitted on the outer peripheral surface of the shaft member, pressure oil is supplied to the hydraulic expansion chamber of the cylindrical member, and the inner peripheral surface of the cylindrical member is adjusted by the pressure oil in the hydraulic expansion chamber. The diameter is reduced and the inner peripheral surface is pressed against the outer peripheral surface of the shaft member, and the shaft member and the cylindrical member are frictionally coupled to transmit torque. In this torque limiter, the locking portion of the shaft member is locked to the other end portion of the shear valve whose one end portion communicates with the hydraulic expansion chamber.

上記軸部材または筒部材に所定値以上の負荷がかかって、筒部材の内周面が軸部材の外周面に対してスリップして、軸部材が筒部材に対して軸回りの位置が変化したとき、上記係止部で上記シャーバルブの他端部を切断して、油圧拡張室の圧油が外部に排出されるようになっている。これにより、筒部材の内周面が、軸部材の外周面に押し付けられなくなって、軸部材と筒部材の摩擦結合を解いて、トルクの伝達を遮断している。   The shaft member or the cylindrical member is subjected to a load of a predetermined value or more, the inner peripheral surface of the cylindrical member slips with respect to the outer peripheral surface of the shaft member, and the position of the shaft member around the axis changes with respect to the cylindrical member. At this time, the other end portion of the shear valve is cut by the locking portion, and the pressure oil in the hydraulic expansion chamber is discharged to the outside. As a result, the inner peripheral surface of the cylindrical member is no longer pressed against the outer peripheral surface of the shaft member, and the frictional coupling between the shaft member and the cylindrical member is released to block transmission of torque.

上記トルクリミッタは、複数の飛散防止カバーを有する。上記各飛散防止カバーは、キャップ状の部材であって、シャーバルブと同じ数だけ存在し、各シャーバルブを覆うように配置されている。上記キャップ状の部材は、筒部材に螺合によって固定されている。   The torque limiter has a plurality of scattering prevention covers. Each of the anti-scattering covers is a cap-shaped member, and is present in the same number as the shear valves so as to cover the shear valves. The cap-shaped member is fixed to the cylindrical member by screwing.

上記飛散防止カバーは、上記シャーバルブの他端部が切断されたとき、この他端部および油圧拡張室内の油が外部に飛び散るのを防止している。   The splash prevention cover prevents the oil in the other end and the hydraulic expansion chamber from splashing outside when the other end of the shear valve is cut.

上記従来のトルクリミッタでは、軸部材が筒部材に対して軸回りの位置が変化して、シャーバルブの上記他端部が切断された後、トルクリミッタのメンテナンスをする際、上記複数の飛散防止カバーを全て取り外す作業と、新しいシャーバルブを所定の位置に嵌め込んだ後に、複数の飛散防止カバーを再度取り付け固定する作業が必要不可欠である。したがって、トルクリミッタの油圧拡張室内の油が外部に解放された後、トルクリミッタを、再度運転可能な状態にするために、工数および労力がかかり、迅速かつ円滑に再度運転可能な状態にすることが難しい。
特開昭６２−１５９８１５号公報 In the conventional torque limiter, when the torque member is maintained after the shaft member changes its position with respect to the cylindrical member and the other end portion of the shear valve is cut, the plurality of scattering preventions are prevented. An operation of removing all the covers and an operation of attaching and fixing a plurality of anti-scattering covers again after fitting a new shear valve in a predetermined position are indispensable. Therefore, after the oil in the hydraulic expansion chamber of the torque limiter is released to the outside, it takes man-hours and labor to make the torque limiter ready for operation again, so that it can be restarted quickly and smoothly. Is difficult.
Japanese Patent Laid-Open No. 62-159815

そこで、本発明の課題は、液圧通路内の液体が外部に解放された後、迅速かつ円滑に再度運転可能な状態にすることができるトルクリミッタを提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a torque limiter that can quickly and smoothly be reactivated after the liquid in the hydraulic passage is released to the outside.

上記課題を解決するため、この発明のトルクリミッタは、
軸部材と、
この軸部材に外嵌した筒部材と
を備え、
上記筒部材および上記軸部材のうちの一方の部材は、
その一方の部材と、上記筒部材および上記軸部材のうちの他方の部材との間でトルクの伝達を行うときに、上記一方の部材の周面を上記他方の部材の周面に押し付けるための液圧通路と、
径方向の外方に開口するシャーバルブ取付穴と、径方向の外方に開口する位置決め部材挿通穴とを有する外周面と、
一端部が上記液圧通路に開口する一方、他端部が上記シャーバルブ取付穴に開口する油抜き孔と、
一端部が上記油抜き孔に連通する一方、他端部が密封されたチューブを有し、かつ、上記シャーバルブ取付穴に取り付けられたシャーバルブと
を有し、
上記他方の部材は、上記シャーバルブを係止可能であると共に、貫通穴を有する係止部を有し、
上記係止部の径方向の外方に位置すると共に、貫通穴を有する環状のカバー部材を備え、
上記カバー部材は、
軸方向に移動可能であり、かつ、
上記カバー部材が上記シャーバルブを径方向に覆う第１状態と、上記カバー部材が上記シャーバルブ取付穴に軸方向に間隔をおいて位置すると共に、上記カバー部材の上記貫通穴、上記係止部の上記貫通穴および上記一方の部材の上記位置決め部材挿通穴が、略径方向に略一直線上に位置する第２状態とをとることが可能であることを特徴としている。 In order to solve the above problems, the torque limiter of the present invention is
A shaft member;
A cylindrical member fitted around the shaft member;
One of the cylindrical member and the shaft member is
When the torque is transmitted between the one member and the other member of the cylindrical member and the shaft member, the peripheral surface of the one member is pressed against the peripheral surface of the other member. A hydraulic passage,
An outer peripheral surface having a shear valve mounting hole that opens radially outward, and a positioning member insertion hole that opens radially outward;
One end portion opens to the hydraulic pressure passage, while the other end portion opens to the shear valve mounting hole,
One end portion communicates with the oil drain hole, the other end portion has a sealed tube, and a shear valve attached to the shear valve attachment hole,
The other member is capable of locking the shear valve and has a locking portion having a through hole,
An annular cover member having a through hole is located outside the locking portion in the radial direction,
The cover member is
Movable in the axial direction, and
A first state in which the cover member covers the shear valve in the radial direction; and the cover member is positioned in the shear valve mounting hole at an axial interval, and the through hole of the cover member and the locking portion The through hole and the positioning member insertion hole of the one member can be in a second state located substantially in a straight line in a substantially radial direction.

本発明によれば、上記カバー部材が、軸方向に移動可能であって、かつ、上記カバー部材がシャーバルブを径方向に覆う第１状態と、上記カバー部材が上記シャーバルブ取付穴に軸方向に間隔をおいて位置すると共に、上記三つの穴が略一直線上に位置する第２状態とをとることができる。   According to the present invention, the cover member is movable in the axial direction, and the cover member covers the shear valve in the radial direction, and the cover member is axially disposed in the shear valve mounting hole. And the second state in which the three holes are located on a substantially straight line.

したがって、例えば、上記軸部材と上記筒部材との間に過大な回転トルクが作用して、係止部によって他端部が破断させられて、シャーバルブを交換する際に、カバー部材等を適宜移動させて、第２状態にした上で、ピンやねじ部材等からなる位置決め部材の挿通によって、上記三つの穴の周方向の相対移動を制限した上で、破断したシャーバルブを、新しいシャーバルブに交換し、その後、カバー部材を、軸方向に適宜移動させて、第１状態にするだけで、トルクリミッタを再稼働可能な状態にすることができる。したがって、簡易かつ迅速にシャーバルブの取り換えを行うことができ、トルクリミッタのメンテナンスを簡易かつ迅速に行うことができる。   Therefore, for example, an excessive rotational torque acts between the shaft member and the cylindrical member, and the other end portion is broken by the locking portion. After moving to the second state, by restricting the relative movement in the circumferential direction of the three holes by inserting a positioning member made of a pin, screw member, etc., the broken shear valve is replaced with a new shear valve. Then, the torque limiter can be brought into a re-operable state simply by moving the cover member appropriately in the axial direction to the first state. Accordingly, the shear valve can be easily and quickly replaced, and the torque limiter can be easily and quickly maintained.

また、一実施形態では、
一端部が、上記カバー部材に対して軸方向に移動不可能に上記カバー部材に取り付けられる一方、他端部が、上記係止部の径方向の外方の表面上を軸方向に摺動可能であり、かつ、上記カバー部材を上記係止部の上記表面に対して径方向の外方に付勢する付勢部材を備え、
上記係止部の上記表面は、上記付勢部材の上記他端部を係止可能な一以上の凹部を有する。 In one embodiment,
One end is attached to the cover member so that it cannot move in the axial direction with respect to the cover member, while the other end is slidable on the radially outer surface of the locking portion in the axial direction. And a biasing member that biases the cover member radially outward relative to the surface of the locking portion,
The surface of the locking portion has one or more recesses that can lock the other end of the biasing member.

上記実施形態によれば、上記付勢部材の上記他端部が、上記凹部に嵌りこんで、上記凹部に係止される位置で、上記カバー部材を、上記係止部に対して安定的に位置決めできる。したがって、第１状態における、上記係止部に対するカバー部材の軸方向の相対位置や、第２状態における、上記係止部に対するカバー部材の軸方向の相対位置を、予め適切な位置に決定することができる。   According to the embodiment, the cover member is stably attached to the locking portion at a position where the other end portion of the biasing member is fitted into the recess and locked to the recess. Can be positioned. Therefore, the relative position in the axial direction of the cover member with respect to the locking portion in the first state and the relative position in the axial direction of the cover member with respect to the locking portion in the second state are determined in advance as appropriate positions. Can do.

また、一実施形態では、
上記一以上の凹部は、上記第２状態において、上記係止部の上記表面において上記付勢部材の上記他端部が接触する箇所に位置する凹部を含む。 In one embodiment,
The one or more recesses include a recess located at a location where the other end of the urging member contacts the surface of the locking portion in the second state.

上記実施形態によれば、第２状態を安定して維持することができる。   According to the embodiment, the second state can be stably maintained.

また、一実施形態では、
上記第２状態において、上記係止部の上記貫通穴を貫通すると共に、上記カバー部材の上記貫通穴の少なくとも一部および上記一方の部材の上記位置決め部材挿通穴の少なくとも一部に位置するピンを備え、
上記第２状態において、上記ピンによって、上記一方の部材に対する上記他方の部材の周方向の相対位置の範囲が制限される。 In one embodiment,
In the second state, a pin that penetrates the through hole of the locking portion and is located in at least a part of the through hole of the cover member and at least a part of the positioning member insertion hole of the one member Prepared,
In the second state, the range of the relative position in the circumferential direction of the other member with respect to the one member is limited by the pin.

上記実施形態によれば、上記ピンを上記三つの穴に跨るように挿入することにより、メンテナンスの作業中、上記一方の部材に対する上記他方の部材の周方向の相対位置の範囲を制限することができる。したがって、シャーバルブの交換等のメンテナンスを容易に行うことができる。   According to the embodiment, by inserting the pin so as to straddle the three holes, it is possible to limit the range of the relative position in the circumferential direction of the other member with respect to the one member during maintenance work. it can. Therefore, maintenance such as replacement of the shear valve can be easily performed.

また、上記実施形態によれば、ピンが上記三つの穴に跨るように挿入されている状態で、第２状態が維持されて、第２状態と異なる状態である第１状態になることができない。換言すると、第１状態でピンが挿通されることができないから、第１状態、すなわち、液圧通路内の液体の飛散防止を行っている最中であるトルクリミッタの回転動力伝達中に、取り忘れられたピンが、トルクリミッタに存在することを完全に防止できる。   Moreover, according to the said embodiment, a 2nd state is maintained in the state inserted so that a pin may straddle said three holes, and it cannot become the 1st state which is a state different from a 2nd state. . In other words, since the pin cannot be inserted in the first state, the pin cannot be inserted in the first state, that is, during the transmission of the rotational power of the torque limiter that is preventing the liquid in the hydraulic passage from scattering. The forgotten pin can be completely prevented from being present in the torque limiter.

したがって、過大な回転トルクが軸部材と筒部材との間に作用した際において、取り忘れた周方向位置決め用のピンによってその過大な回転トルクが軸部材と筒部材との間に伝達することを完全に防止でき、ピンの取り忘れによってトルクの遮断を行うことができないという致命的なミスを完全に防止することができる。   Therefore, when excessive rotational torque acts between the shaft member and the cylindrical member, the excessive rotational torque is transmitted between the shaft member and the cylindrical member by the circumferential positioning pin that is forgotten. It is possible to completely prevent the fatal mistake that the torque cannot be interrupted by forgetting to remove the pin.

また、一実施形態では、
上記係止部の上記貫通穴は、雌ねじが形成されたねじ穴であり、
上記カバー部材の上記貫通穴は、上記雌ねじに螺合するねじ部材が通過可能であり、
上記位置決め部材挿通穴は、上記ねじ部材の少なくとも一部が挿通可能であり、
上記第２状態において、上記係止部の上記ねじ穴に螺合すると共に、上記カバー部材の上記貫通穴の少なくとも一部および上記一方の部材の上記位置決め部材挿通穴の少なくとも一部に位置する上記ねじ部材を備え、
上記第２状態において、上記ねじ部材によって、上記一方の部材に対する上記他方の部材の周方向の相対位置の範囲が制限される。 In one embodiment,
The through hole of the locking portion is a screw hole in which a female screw is formed,
The through hole of the cover member can pass through a screw member that is screwed into the female screw,
In the positioning member insertion hole, at least a part of the screw member can be inserted,
In the second state, the screw member is screwed into the screw hole of the locking portion, and is located in at least a part of the through hole of the cover member and at least a part of the positioning member insertion hole of the one member. A screw member;
In the second state, a range of a relative position in the circumferential direction of the other member with respect to the one member is limited by the screw member.

上記実施形態によれば、上記ねじ部材を上記三つの穴に跨るように挿入することにより、メンテナンスの作業中、上記一方の部材に対する上記他方の部材の周方向の相対位置の範囲を制限することができる。したがって、シャーバルブの交換等のメンテナンスを容易に行うことができる。   According to the embodiment, the range of the relative position in the circumferential direction of the other member with respect to the one member is limited during maintenance work by inserting the screw member so as to straddle the three holes. Can do. Therefore, maintenance such as replacement of the shear valve can be easily performed.

また、上記実施形態によれば、上記ねじ部材が上記三つの穴に跨るように挿入されている状態で、第２状態が維持されて、第１状態になることができない。換言すると、第１状態でねじ部材が挿通されることができないから、第１状態、すなわち、液圧通路内の液体の飛散防止を行っている最中であるトルクリミッタの回転動力伝達中に、取り忘れられたねじ部材が、トルクリミッタに存在することを完全に防止できる。   Moreover, according to the said embodiment, a 2nd state is maintained in the state inserted so that the said screw member may straddle said three holes, and it cannot become a 1st state. In other words, since the screw member cannot be inserted in the first state, during the first state, that is, during the rotational power transmission of the torque limiter that is in the process of preventing the liquid in the hydraulic pressure passage from being scattered, It is possible to completely prevent the forgotten screw member from being present in the torque limiter.

したがって、過大な回転トルクが軸部材と筒部材との間に作用した際において、取り忘れた周方向位置決め用のねじ部材によってその過大な回転トルクが軸部材と筒部材との間に伝達することを完全に防止でき、ねじ部材の取り忘れによってトルクの遮断を行うことができないという致命的なミスを完全に防止することができる。   Therefore, when excessive rotational torque acts between the shaft member and the cylindrical member, the excessive rotational torque is transmitted between the shaft member and the cylindrical member by the circumferential positioning screw member that is forgotten. It is possible to completely prevent the fatal mistake that the torque cannot be interrupted by forgetting to remove the screw member.

本発明のトルクリミッタによれば、シャーバルブを簡易かつ迅速に交換できて、メンテナンスを簡易かつ迅速に行うことができる。   According to the torque limiter of the present invention, the shear valve can be replaced easily and quickly, and maintenance can be performed easily and quickly.

以下、本発明を図示の形態により詳細に説明する。
図１は、本発明の一実施形態のトルクリミッタの軸方向の模式断面図である。 Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view in the axial direction of a torque limiter according to an embodiment of the present invention.

このトルクリミッタは、一方の部材としての筒部材１、他方の部材としての軸部材２、四つのシャーバルブ６、玉軸受１７および玉軸受１８を備える。   The torque limiter includes a cylindrical member 1 as one member, a shaft member 2 as the other member, four shear valves 6, a ball bearing 17 and a ball bearing 18.

上記筒部材１は、第１の筒部材１０と、第２の筒部材１１とからなっている。上記第１の筒部材１０は、軸部材２の外周面２０に当接する略円筒状の内周面２１を有している。上記軸部材２の外周面２０と、第１の筒部材１０の内周面２１との間には、焼付き防止用の潤滑油（トラクションオイルやタービンオイル等）が存在している。上記第２の筒部材１１は、第１の筒部材１０の略円筒状の外周面２３に当接する略円筒状の内周面２４を有している。上記第２の筒部材１１は、四つのシャーバルブ取付穴３０と、液圧通路としての環状の油圧拡張室２６とを有する。   The cylinder member 1 includes a first cylinder member 10 and a second cylinder member 11. The first cylindrical member 10 has a substantially cylindrical inner peripheral surface 21 that contacts the outer peripheral surface 20 of the shaft member 2. Between the outer peripheral surface 20 of the shaft member 2 and the inner peripheral surface 21 of the first cylindrical member 10, seizure prevention lubricating oil (such as traction oil or turbine oil) exists. The second cylindrical member 11 has a substantially cylindrical inner peripheral surface 24 that abuts on the substantially cylindrical outer peripheral surface 23 of the first cylindrical member 10. The second cylinder member 11 has four shear valve mounting holes 30 and an annular hydraulic expansion chamber 26 as a hydraulic pressure passage.

上記油圧拡張室２６は、第２の筒部材１１の内周面２４の軸方向の所定長さに亘って略軸部材２の軸方向に延在している。上記四つのシャーバルブ取付穴３０は、第２の筒部材１１の外周面において、周方向に等間隔に位置している。上記シャーバルブ６は、シャーバルブ取付穴３０の数と同一の数存在している。上記各シャーバルブ６は、シャーバルブ取付穴３０に嵌入されて固定されている。   The hydraulic expansion chamber 26 extends substantially in the axial direction of the shaft member 2 over a predetermined length in the axial direction of the inner peripheral surface 24 of the second cylindrical member 11. The four shear valve mounting holes 30 are located at equal intervals in the circumferential direction on the outer peripheral surface of the second cylindrical member 11. The number of shear valves 6 is the same as the number of shear valve mounting holes 30. Each shear valve 6 is fitted and fixed in the shear valve mounting hole 30.

上記玉軸受１７は、軸部材２の外周面に外嵌されて固定された内輪４０と、第２の筒部材１１の内周面に内嵌されて固定された外輪４１と、内輪４０の軌道面と外輪４１の軌道面と間に配置された複数の玉４２とを有している。また、上記玉軸受１８は、軸部材２の外周面に外嵌されて固定された内輪４４と、第１の筒部材１０の内周面に内嵌されて固定された外輪４５と、内輪４４の軌道面と外輪４５の軌道面と間に配置された複数の玉４６とを有している。上記玉軸受１７および１８は、以下に詳述する軸部材２が筒部材１に対して相対回転している際、軸部材２を筒部材１に対して回転自在に支持するようになっている。   The ball bearing 17 includes an inner ring 40 that is fitted and fixed to the outer circumferential surface of the shaft member 2, an outer ring 41 that is fitted and fixed to the inner circumferential surface of the second cylindrical member 11, and a track of the inner ring 40. And a plurality of balls 42 arranged between the surface and the raceway surface of the outer ring 41. The ball bearing 18 includes an inner ring 44 that is fitted and fixed to the outer circumferential surface of the shaft member 2, an outer ring 45 that is fitted and fixed to the inner circumferential surface of the first cylindrical member 10, and an inner ring 44. And a plurality of balls 46 arranged between the raceway surface of the outer ring 45 and the raceway surface of the outer ring 45. The ball bearings 17 and 18 are configured to rotatably support the shaft member 2 with respect to the tubular member 1 when the shaft member 2 described in detail below rotates relative to the tubular member 1. .

図２は、図１にｂで示す図１におけるシャーバルブ６の周辺の拡大断面図である。   FIG. 2 is an enlarged cross-sectional view of the periphery of the shear valve 6 in FIG.

図２に示すように、第２の筒部材１１は、油抜き孔２８を有し、油抜き孔２８の径方向の外方の他端は、シャーバルブ取付穴３０に開口する一方、油抜き孔２８の径方向の内方の一端は、油圧拡張室２６に連通している。   As shown in FIG. 2, the second cylinder member 11 has an oil drain hole 28, and the other end in the radial direction of the oil drain hole 28 opens into the shear valve mounting hole 30, while the oil drain hole One end in the radial direction of the hole 28 communicates with the hydraulic expansion chamber 26.

上記各シャーバルブ６は、内部にチューブ（通路）を有している。上記チューブは、シャーバルブ６がシャーバルブ取付穴３０に嵌入されている状態で、略軸部材２の径方向に延在している。図２に示すように、上記シャーバルブ６の径方向の外方の端部は、Ｔ字状の頭部３７を構成している。上記シャーバルブ６がシャーバルブ取付穴３０に嵌入されている状態で、上記頭部３７は、第２の筒部材１１の外周面よりも径方向の外方に突出している。   Each shear valve 6 has a tube (passage) inside. The tube extends substantially in the radial direction of the shaft member 2 in a state where the shear valve 6 is fitted in the shear valve mounting hole 30. As shown in FIG. 2, the radially outer end of the shear valve 6 constitutes a T-shaped head 37. In a state where the shear valve 6 is fitted in the shear valve mounting hole 30, the head portion 37 projects outward in the radial direction from the outer peripheral surface of the second cylindrical member 11.

上記シャーバルブ６がシャーバルブ取付穴３０に嵌入されている状態で、上記チューブの径方向の内方の一端部は、油抜き孔２８の他端に連通し、油圧拡張室２６の軸方向の一端側に連通している。また、上記シャーバルブ６がシャーバルブ取付穴３０に嵌入されている状態で、上記チューブの径方向の外方の他端部は、頭部３７まで延在し、第２の筒部材１１の外周面よりも径方向の外方に突出している。上記チューブの径方向の外方の他端部は、密封されている。   In a state where the shear valve 6 is fitted in the shear valve mounting hole 30, one end portion in the radial direction of the tube communicates with the other end of the oil drain hole 28, and the axial direction of the hydraulic expansion chamber 26 is in the axial direction. It communicates with one end side. Further, in the state in which the shear valve 6 is fitted in the shear valve mounting hole 30, the radially outer other end of the tube extends to the head 37 and the outer periphery of the second cylindrical member 11. Projects radially outward from the surface. The other end portion in the radial direction of the tube is sealed.

図１および図２に示すように、上記軸部材２は、本体部（軸状部）８および係止部９を有し、本体部８は、略円筒状の外周面２０を有している。上記係止部９は、本体部８に連なっている。上記係止部９は、本体部８に固定されている。上記係止部９は、断面略Ｌ字状の形状を有し、本体部８の外周面から突出している。   As shown in FIGS. 1 and 2, the shaft member 2 has a main body portion (shaft-shaped portion) 8 and a locking portion 9, and the main body portion 8 has a substantially cylindrical outer peripheral surface 20. . The locking portion 9 is continuous with the main body portion 8. The locking portion 9 is fixed to the main body portion 8. The locking portion 9 has a substantially L-shaped cross section and protrudes from the outer peripheral surface of the main body portion 8.

図２に示すように、上記係止部９は、径方向延在部５０および軸方向延在部５１を有する。上記径方向延在部５０は、筒部材１の軸方向の一方の側の端面５５に軸方向に対向すると共に、径方向に延在している。上記軸方向延在部５１は、径方向延在部５０につながっている。上記軸方向延在部５１は、筒部材１の外周面に沿って軸方向に延在している。   As shown in FIG. 2, the locking portion 9 has a radially extending portion 50 and an axially extending portion 51. The radially extending portion 50 is opposed to the end surface 55 on one side in the axial direction of the tubular member 1 in the axial direction and extends in the radial direction. The axially extending portion 51 is connected to the radially extending portion 50. The axially extending portion 51 extends in the axial direction along the outer peripheral surface of the cylindrical member 1.

上記軸方向延在部５１は、軸方向の予め定められた範囲に環状の環状部を有している。また、上記軸方向延在部５１の径方向延在部５０側とは反対側の端部は、貫通孔のバルブ係止部１１８を構成し、このバブル係止部１１８は、シャーバルブ６の頭部３７に接触せずに周囲を囲っている。筒部材１と軸部材２とが相対回転していないとき、上記軸方向延在部５１の径方向延在部５０側とは反対側の端部は、頭部３７に対して相対移動不可になっている。   The axially extending portion 51 has an annular portion in a predetermined range in the axial direction. Further, the end of the axially extending portion 51 opposite to the radially extending portion 50 side constitutes a valve locking portion 118 of a through-hole, and this bubble locking portion 118 is connected to the shear valve 6. It surrounds the head 37 without touching it. When the tubular member 1 and the shaft member 2 are not rotating relative to each other, the end portion of the axially extending portion 51 opposite to the radially extending portion 50 side cannot be moved relative to the head portion 37. It has become.

図２に示すように、このトルクリミッタは、環状のカバー部材８０を備え、そのカバー部材８０は、軸方向延在部５１の径方向の外方に位置している。上記カバー部材８０は、軸方向延在部５１の環状部の外周面上を、軸方向に摺動可能に移動できるようになっている。   As shown in FIG. 2, the torque limiter includes an annular cover member 80, and the cover member 80 is positioned outward in the radial direction of the axially extending portion 51. The cover member 80 can move on the outer peripheral surface of the annular portion of the axially extending portion 51 so as to be slidable in the axial direction.

詳しくは、上記カバー部材８０には、環状上の摺動を可能にする付勢部材が、カバー部材８０に対して軸方向に相対移動不可に取り付けられている。   Specifically, an urging member that enables sliding on the ring is attached to the cover member 80 so as not to move relative to the cover member 80 in the axial direction.

図３は、上記付勢部材９０の構造を示す模式図である。   FIG. 3 is a schematic view showing the structure of the urging member 90.

図３に示すように、上記カバー部材８０は、内方側に有底の円筒穴８１を有している。また、上記付勢部材９０は、つる巻バネ９１と、ボール９２とを有している。上記つる巻バネ９１の一端は、円筒穴８１の底面に接続されている。また、上記ボール９２は、つる巻バネ９１の他端に接続されている。上記ボール９２の直径は、円筒穴８１の断面の直径と略同一で少し小さくなっている。上記ボール９２の一部分は、円筒穴８１からはみ出している。上記ボール９２において円筒穴８１からはみ出している上記一部分を、係止部９の環状部の外周面９５上を軸方向に摺動させることにより、カバー部材８０が、係止部９に対して軸方向に摺動できるようになっている。   As shown in FIG. 3, the cover member 80 has a bottomed cylindrical hole 81 on the inner side. The biasing member 90 includes a helical spring 91 and a ball 92. One end of the helical spring 91 is connected to the bottom surface of the cylindrical hole 81. The ball 92 is connected to the other end of the helical spring 91. The diameter of the ball 92 is substantially the same as the diameter of the cross section of the cylindrical hole 81 and is slightly smaller. A part of the ball 92 protrudes from the cylindrical hole 81. By sliding the part of the ball 92 protruding from the cylindrical hole 81 on the outer peripheral surface 95 of the annular portion of the locking portion 9 in the axial direction, the cover member 80 is pivoted with respect to the locking portion 9. It can slide in the direction.

再度、図２を参照して、上記カバー部材８０は、貫通穴１００を有し、係止部９は、ねじ穴１０１を有し、筒部材１の第２の筒部材１１の外周面は、位置決め部材挿通穴としての有底の穴１０２を有している。上記ねじ穴１０１は、係止部９を径方向に貫通している。   Referring to FIG. 2 again, the cover member 80 has a through hole 100, the locking portion 9 has a screw hole 101, and the outer peripheral surface of the second cylinder member 11 of the cylinder member 1 is A bottomed hole 102 is provided as a positioning member insertion hole. The screw hole 101 penetrates the locking portion 9 in the radial direction.

図２に示すように、上記カバー部材８０の貫通穴１００、係止部９のねじ穴１０１、および、筒部材１の穴１０２が、略一直線上に位置している状態で、ねじ部材１１０を、係止部９のねじ穴１０１に螺合すると共に、カバー部材８０の貫通穴１００の少なくとも一部および有底の穴１０２の少なくとも一部に位置させることにより、筒部材１に対する係止部９およびカバー部材８０の夫々の周方向の相対位置の範囲を制限するようになっている。   As shown in FIG. 2, the screw member 110 is placed in a state where the through hole 100 of the cover member 80, the screw hole 101 of the locking portion 9, and the hole 102 of the cylindrical member 1 are positioned substantially in a straight line. The locking portion 9 with respect to the tubular member 1 is screwed into the screw hole 101 of the locking portion 9 and positioned in at least a part of the through hole 100 and the bottomed hole 102 of the cover member 80. And the range of the relative position of each circumferential direction of the cover member 80 is restrict | limited.

図２に示すように、ねじ部材１１０が、係止部９のねじ穴１０１に螺合すると共に、カバー部材８０の貫通穴１００の少なくとも一部および有底の穴１０２の少なくとも一部に位置している状態で、カバー部材８０は、シャーバルブ挿通穴３０に対して軸方向に間隔をおいて位置している。この状態において、シャーバルブ６の全体がバルブ係止部１１８と筒部材１の径方向に重なるようになっている。   As shown in FIG. 2, the screw member 110 is screwed into the screw hole 101 of the locking portion 9 and is located in at least a part of the through hole 100 and the bottomed hole 102 of the cover member 80. In this state, the cover member 80 is located at an interval in the axial direction with respect to the shear valve insertion hole 30. In this state, the whole shear valve 6 overlaps the valve locking portion 118 and the radial direction of the cylindrical member 1.

上記ねじ部材１１０が、係止部９のねじ穴１０１に螺合すると共に、カバー部材８０の貫通穴１００の少なくとも一部および有底の穴１０２の少なくとも一部に位置している状態は、第２状態になっている。   A state in which the screw member 110 is screwed into the screw hole 101 of the locking portion 9 and is positioned in at least a part of the through hole 100 and the bottomed hole 102 of the cover member 80 is the first state. There are two states.

上記付勢部材（図３に９０で示す）は、カバー部材８０においてその貫通穴１００の軸方向の両側に位置している。図２に１２０および１２１で示す箇所、すなわち、上記第２状態において上記付勢部材が接触する係止部９の外周面の箇所（周方向の位置が図２の断面とは異なる）には、凹部（図３に１３０で示す）が形成されている。   The urging member (indicated by 90 in FIG. 3) is located on both sides of the through hole 100 in the axial direction of the cover member 80. In locations indicated by 120 and 121 in FIG. 2, that is, locations on the outer peripheral surface of the locking portion 9 that the urging member contacts in the second state (the circumferential position is different from the cross section of FIG. 2), A recess (denoted 130 in FIG. 3) is formed.

図３を再度参照して、上記凹部１３０は、円錐内周面を有する有底の穴である。詳しくは、上記凹部１３０は、軸方向の断面において、略等脚台形の形状を有する一方、延在方向に垂直な方向の断面において、略円形の形状を有している。   Referring to FIG. 3 again, the recess 130 is a bottomed hole having a conical inner peripheral surface. Specifically, the recess 130 has a substantially isosceles trapezoidal shape in the cross section in the axial direction, and has a substantially circular shape in the cross section in the direction perpendicular to the extending direction.

図３に示すように、軸方向の断面において、凹部１３０の開口の軸方向の距離は、ボール９２の直径よりも小さくなっている。図３に示すように、上記第２状態において、カバー部材８０においてその貫通穴１００の軸方向の両側に位置するボール９２を、係止部９の凹部１３０に嵌入させることにより、係止部９に対するカバー部材８０の軸方向の相対位置を、安定的に位置決めするようになっている。   As shown in FIG. 3, in the axial section, the axial distance of the opening of the recess 130 is smaller than the diameter of the ball 92. As shown in FIG. 3, in the second state, in the cover member 80, the balls 92 positioned on both sides in the axial direction of the through hole 100 are fitted into the recesses 130 of the locking portion 9, thereby The relative position of the cover member 80 in the axial direction with respect to is stably positioned.

図４は、第１状態をとっている、この実施形態のトルクリミッタの軸方向の模式断面図である。   FIG. 4 is a schematic cross-sectional view in the axial direction of the torque limiter of this embodiment taking the first state.

トルクリミッタは、筒部材１と軸部材２との間で動力の伝達を行っている最中において、第１状態をとり、上記カバー部材１００は、第１状態において、オイルの飛散防止を行っている。   The torque limiter takes a first state during transmission of power between the tubular member 1 and the shaft member 2, and the cover member 100 prevents oil from being scattered in the first state. Yes.

図４に示すように、第１状態では、シャーバルブ６の全体が、カバー部材８０の軸方向の環状の一端部１４０の内周面に、径方向に重なっている。すなわち、第１状態では、上記シャーバルブ６の径方向の外方が完全にカバー部材８０によって覆われている。   As shown in FIG. 4, in the first state, the entire shear valve 6 overlaps the inner peripheral surface of the annular one end portion 140 in the axial direction of the cover member 80 in the radial direction. That is, in the first state, the outer side of the shear valve 6 in the radial direction is completely covered by the cover member 80.

第１状態も、図３に示す機構で安定的な軸方向の位置決めが行われるようになっている。すなわち、上記シャーバルブ６の全体が、カバー部材８０の軸方向の環状の一端部１４０の内周面に径方向に重なっている状態において、上記付勢部材が接触する係止部９の外周面の箇所１６０,１６１（周方向の位置が図４の断面とは異なる）には、凹部（図３に１３０で示す）が形成されている。   Also in the first state, stable axial positioning is performed by the mechanism shown in FIG. That is, the outer peripheral surface of the locking portion 9 that contacts the biasing member in a state where the entire shear valve 6 is radially overlapped with the inner peripheral surface of the annular one end portion 140 in the axial direction of the cover member 80. In the portions 160 and 161 (the positions in the circumferential direction are different from the cross section of FIG. 4), recesses (denoted by 130 in FIG. 3) are formed.

第１状態において、付勢部材のボール９２（図３参照）を、凹部１３０（図３参照）に嵌入して、第１状態を安定的に維持するようにしている。図４に示すように、第１状態では、カバー部材８０の貫通穴１００は、係止部９のねじ穴１０１に軸方向に間隔をおいて位置している。   In the first state, the ball 92 (see FIG. 3) of the urging member is fitted into the recess 130 (see FIG. 3) to stably maintain the first state. As shown in FIG. 4, in the first state, the through hole 100 of the cover member 80 is positioned in the axial direction in the screw hole 101 of the locking portion 9.

尚、図３に示すように、凹部１３０の形状を、開口側に行くにしたがって末広がりな形状にすることによって、第１状態から第２状態、または、第２状態から第１状態に移行する際に、上記ボールが凹部から抜け出やすいようにしている。   In addition, as shown in FIG. 3, when the shape of the recessed part 130 is made into a shape which is divergent as it goes to the opening side, the transition from the first state to the second state or from the second state to the first state is performed. In addition, the balls are easily pulled out of the recesses.

また、図３に８１で示す円筒穴は、カバー部材８０の貫通穴１００を挟んだ２箇所の夫々において、カバー部材８０の軸方向の同じ位置に、周方向に略等間隔に３つ形成され、都合６つ形成されている。また、上記付勢部材９０は、各円筒穴８１に固定されている。上記付勢部材９０は、軸方向に２列に亘って都合６つ配置されている。このように、６つの付勢部材９０を、軸方向に２列かつ周方向に略等間隔に配置することにより、カバー部材８０を、係止部９上で安定させるようになっている。   In addition, three cylindrical holes denoted by reference numeral 81 in FIG. 3 are formed at approximately the same distance in the circumferential direction at the same position in the axial direction of the cover member 80 at two positions sandwiching the through hole 100 of the cover member 80. , Six are formed for convenience. The urging member 90 is fixed to each cylindrical hole 81. The urging members 90 are conveniently arranged in two rows in the axial direction. As described above, the six biasing members 90 are arranged in two rows in the axial direction and at substantially equal intervals in the circumferential direction, so that the cover member 80 is stabilized on the locking portion 9.

上記構成において、上記軸部材２または筒部材１に所定値以下の負荷（トルクの伝達を行う範囲の負荷）がかかっている場合には、カプラ（図示せず）によって油圧拡張室２６に注入された油圧拡張用の油で、第１の筒部材１０の内周面２１を縮径してその内周面２１を軸部材１の外周面２０に押し付けて、軸部材１と筒部材２とを摩擦結合して、軸部材１と筒部材２との間でトルクを伝達するようになっている。   In the above configuration, when a load less than a predetermined value is applied to the shaft member 2 or the cylindrical member 1 (load within a range in which torque is transmitted), it is injected into the hydraulic expansion chamber 26 by a coupler (not shown). With the oil for hydraulic expansion, the inner peripheral surface 21 of the first cylindrical member 10 is reduced in diameter, and the inner peripheral surface 21 is pressed against the outer peripheral surface 20 of the shaft member 1 so that the shaft member 1 and the cylindrical member 2 are connected. A torque is transmitted between the shaft member 1 and the cylindrical member 2 by frictional coupling.

一方、上記軸部材２または筒部材１に所定値以上の負荷（トルクの伝達を行う範囲よりも大きな負荷）がかかって、軸部材２の外周面２０が、第１の筒部材１０の内周面２１に対してスリップして、軸部材２と筒部材１の軸回りの位置が変化した場合、係止部９がシャーバルブ６の頭部３７を切断して、油圧拡張室２６内の油圧拡張用の油を、他端が切断されたシャーバルブ６のチューブを介して外部に排出するようになっている。このようにして、上記軸部材２の外周面２０に対する第１の筒部材１０の内周面２１の押圧力をなくして、軸部材２と筒部材１の摩擦結合を解いて、トルクの伝達を遮断するようになっている。このようにして、上記軸部材２または筒部材１に過負荷が生じた場合において、トルクの伝達を遮断して、トルクリミッタ装置に連結されている高価な機械を保護するようになっている。   On the other hand, the shaft member 2 or the cylindrical member 1 is subjected to a load greater than a predetermined value (a load larger than the range in which torque is transmitted), and the outer peripheral surface 20 of the shaft member 2 is the inner periphery of the first cylindrical member 10. When the position of the shaft member 2 and the cylindrical member 1 about the axis changes due to slipping with respect to the surface 21, the locking portion 9 cuts the head 37 of the shear valve 6, and the hydraulic pressure in the hydraulic expansion chamber 26 is changed. The oil for expansion is discharged to the outside through the tube of the shear valve 6 with the other end cut off. In this way, the pressing force of the inner peripheral surface 21 of the first cylindrical member 10 against the outer peripheral surface 20 of the shaft member 2 is eliminated, the frictional coupling between the shaft member 2 and the cylindrical member 1 is released, and torque is transmitted. It is designed to shut off. In this way, when an overload occurs in the shaft member 2 or the cylindrical member 1, the transmission of torque is cut off to protect the expensive machine connected to the torque limiter device.

更には、このトルクリミッタは、トルクの伝達が遮断された場合、すなわち、シャーバルブ６が破断した場合において、例えば、次のように、シャーバルブ６の取り換え、および、油圧拡張室２６への油の充填を行うようになっている。   Furthermore, this torque limiter is used when the transmission of torque is interrupted, that is, when the shear valve 6 is broken, for example, as described below, replacement of the shear valve 6 and oil to the hydraulic expansion chamber 26 are performed. It is supposed to be filled.

先ず、図４に示す第１状態での配置になっているシャーバルブの破断直後のカバー部材８０を、係止部９上を、係止部９のねじ穴１０１とカバー部材８０の貫通穴１００とが径方向に重なる方向に移動させ、各付勢部材９０のボール９２を、係止部９の凹部１３０に嵌め込むと同時に、カバー部材８０の貫通穴１００と筒部材１の穴１０２とが径方向に重なるように軸部材２に対して筒部材１を相対回転させる。このようにして、カバー部材８０の貫通穴１００、係止部９のねじ穴１０１、および、筒部材１の穴１０２を、略一直線上に位置させ、トルクリミッタの状態を、第２状態にする。   First, the cover member 80 immediately after fracture of the shear valve, which is arranged in the first state shown in FIG. 4, is placed on the locking portion 9 with the screw hole 101 of the locking portion 9 and the through hole 100 of the cover member 80. And the balls 92 of the respective biasing members 90 are fitted into the recesses 130 of the locking portions 9, and at the same time, the through holes 100 of the cover member 80 and the holes 102 of the cylindrical member 1 are moved. The cylinder member 1 is rotated relative to the shaft member 2 so as to overlap in the radial direction. In this way, the through hole 100 of the cover member 80, the screw hole 101 of the locking portion 9, and the hole 102 of the cylindrical member 1 are positioned substantially in a straight line, and the torque limiter is set to the second state. .

続いて、上記ねじ部材１１０を、係止部９のねじ穴１０１に螺合させると共に、カバー部材８０の貫通穴１００の少なくとも一部および有底の穴１０２の少なくとも一部に位置させて、第２状態を安定的に維持する。   Subsequently, the screw member 110 is screwed into the screw hole 101 of the locking portion 9, and is positioned in at least a part of the through hole 100 and the bottomed hole 102 of the cover member 80, Maintain two states stably.

ここで、上記ねじ部材１１０は、筒部材１と、軸部材２との位相を一致させる、詳しくは、係止部９の上記バルブ係止部１１８の周方向の位置と、シャーバルブ取付穴３０の周方向の位置とを、一致させる役割を果たしている。   Here, the screw member 110 makes the phases of the cylindrical member 1 and the shaft member 2 coincide with each other. Specifically, the position of the locking portion 9 in the circumferential direction of the valve locking portion 118 and the shear valve mounting hole 30. It plays a role to match the position in the circumferential direction.

その後、頭部３７が破断している４つの使用済みのシャーバルブ６を、頭部３７が密封された新しいシャーバルブ６に交換し、係止部９のバルブ係止部１１８で、その新しいシャーバルブ６の周囲を囲み、この後に、カプラ（図示せず）を、カプラ挿通穴（図示せず）を通して給脂口（図示せず）に挿通し、所定量の油を、油圧拡張室２６内に封入する。   Thereafter, the four used shear valves 6 whose heads 37 are broken are replaced with new shear valves 6 whose heads 37 are sealed, and the new shear valves 6 of the locking parts 9 are replaced with the new shear valves 6. The periphery of the valve 6 is surrounded, and thereafter, a coupler (not shown) is inserted into a greasing port (not shown) through a coupler insertion hole (not shown), and a predetermined amount of oil is supplied into the hydraulic expansion chamber 26. Enclose in.

その後、上記ねじ部材１１０を、筒部材１、係止部９およびカバー部材８０から抜き取り、続いて、カバー部材８０を、係止部９に対して軸方向に相対移動させて、カバー部材８０で、上記新しいシャーバルブ６を完全に覆って、トルクリミッタを、再度、運転可能な第１状態にする。このようにして、シャーバルブ６の取り換えと、油圧拡張室２６への油の再充填とを行う。   Thereafter, the screw member 110 is removed from the cylindrical member 1, the locking portion 9, and the cover member 80, and then the cover member 80 is moved relative to the locking portion 9 in the axial direction. Then, the new shear valve 6 is completely covered, and the torque limiter is again brought into the first operable state. In this manner, replacement of the shear valve 6 and refilling of the oil into the hydraulic expansion chamber 26 are performed.

上記実施形態のトルクリミッタによれば、上記カバー部材８０が、軸方向に移動可能であって、かつ、カバー部材８０がシャーバルブ６を径方向に覆う第１状態と、カバー部材８０がシャーバルブ取付穴３０に軸方向に間隔をおいて位置すると共に、三つの穴１００,１０１,１０２が略一直線上に位置する第２状態とをとることができる。   According to the torque limiter of the above embodiment, the cover member 80 is movable in the axial direction and the cover member 80 covers the shear valve 6 in the radial direction, and the cover member 80 is the shear valve. A second state in which the three holes 100, 101, 102 are positioned on a substantially straight line can be taken while being positioned at an interval in the mounting hole 30 in the axial direction.

したがって、例えば、上記軸部材２と筒部材１との間に過大な回転トルクが作用して、係止部９によって他端部が破断させられたシャーバルブ６を交換する際に、カバー部材８０等を適宜移動させて、第２状態にした上で、ねじ部材１１０の挿通によって、上記三つの穴１００,１０１,１０２の周方向の相対移動を制限した上で、破断したシャーバルブ６を、新しいシャーバルブ６に交換し、その後、カバー部材８０を、軸方向に適宜移動させて、第１状態にするだけで、トルクリミッタを再稼働可能な状態にすることができる。したがって、簡易かつ迅速にシャーバルブ６の取り換えを行うことができ、トルクリミッタのメンテナンスを簡易かつ迅速に行うことができる。   Therefore, for example, when the shear valve 6 whose other end portion is broken by the locking portion 9 due to an excessive rotational torque acting between the shaft member 2 and the cylindrical member 1, the cover member 80 is replaced. Etc. are appropriately moved to be in the second state, the relative movement in the circumferential direction of the three holes 100, 101, 102 is restricted by the insertion of the screw member 110, and the broken shear valve 6 is The torque limiter can be reactivated by simply replacing the shear valve 6 and then moving the cover member 80 appropriately in the axial direction to the first state. Therefore, the shear valve 6 can be replaced easily and quickly, and maintenance of the torque limiter can be performed easily and quickly.

また、上記実施形態のトルクリミッタによれば、上記付勢部材９０の他端部が、凹部１３０に嵌りこんで、凹部１３０に係止される位置で、カバー部材８０を、係止部９に対して安定的に軸方向に位置決めすることができる。したがって、第１状態における、係止部９に対するカバー部材８０の軸方向の相対位置や、第２状態における、係止部９に対するカバー部材８０の軸方向の相対位置を、予め適切な位置に決定することができる。   Further, according to the torque limiter of the above embodiment, the cover member 80 is fixed to the locking portion 9 at a position where the other end portion of the biasing member 90 is fitted into the recess 130 and locked to the recess 130. On the other hand, it can be stably positioned in the axial direction. Accordingly, the relative position in the axial direction of the cover member 80 with respect to the locking portion 9 in the first state and the relative position in the axial direction of the cover member 80 with respect to the locking portion 9 in the second state are determined in advance as appropriate positions. can do.

また、上記実施形態のトルクリミッタによれば、第１および第２状態の夫々において、上記係止部９の外周面において付勢部材９０が接触する箇所に、凹部１３０が形成されているから、第１状態および第２状態を安定して維持することができる。   Further, according to the torque limiter of the above-described embodiment, the concave portion 130 is formed at a location where the biasing member 90 contacts on the outer peripheral surface of the locking portion 9 in each of the first and second states. The first state and the second state can be stably maintained.

また、上記実施形態のトルクリミッタによれば、上記ねじ部材１１０を上記三つの穴１００,１０１,１０２に跨るように挿入することにより、メンテナンスの作業中、軸部材２に対する筒部材１の周方向の相対位置の範囲を制限することができる。したがって、上記シャーバルブ６の交換等のメンテナンスを容易に行うことができる。   Further, according to the torque limiter of the above embodiment, the circumferential direction of the cylindrical member 1 with respect to the shaft member 2 during the maintenance work by inserting the screw member 110 so as to straddle the three holes 100, 101, 102. The range of the relative position can be limited. Therefore, maintenance such as replacement of the shear valve 6 can be easily performed.

また、上記実施形態のトルクリミッタによれば、ねじ部材１１０が上記三つの穴１００,１０１,１０２に跨るように挿入されている状態で、第２状態が維持されて、第１状態になることができない。換言すると、第１状態でねじ部材１１０が挿通されることができないから、第１状態、すなわち、油圧拡張室２６内の油の飛散防止を行っている最中であるトルクリミッタの回転動力伝達中に、取り忘れられたねじ部材１１０が、トルクリミッタに存在することを完全に防止できる。   Further, according to the torque limiter of the above-described embodiment, the second state is maintained and the first state is reached in a state where the screw member 110 is inserted so as to straddle the three holes 100, 101, 102. I can't. In other words, since the screw member 110 cannot be inserted in the first state, the rotational power of the torque limiter is being transmitted in the first state, that is, in the middle of preventing the oil in the hydraulic expansion chamber 26 from being scattered. In addition, it is possible to completely prevent the forgotten screw member 110 from being present in the torque limiter.

したがって、過大な回転トルク（係止部９が、シャーバルブ６を破断する時のトルク）が軸部材２と筒部材１との間に作用した際において、取り忘れた周方向位置決め用のねじ部材１１０によってその過大な回転トルクが軸部材２と筒部材１との間に伝達することを完全に防止でき、ねじ部材１１０の取り忘れによってトルクの遮断を行うことができないという致命的なミスを完全に防止することができる。   Therefore, when excessive rotational torque (torque when the locking portion 9 breaks the shear valve 6) acts between the shaft member 2 and the cylindrical member 1, a screw member for circumferential positioning that is forgotten to be removed. 110 can completely prevent the excessive rotational torque from being transmitted between the shaft member 2 and the cylindrical member 1, and the fatal mistake that the torque cannot be cut off due to forgetting to remove the screw member 110 is completely eliminated. Can be prevented.

尚、上記実施形態のトルクリミッタでは、係止部９がねじ穴１０１を有し、第２状態において、略一直線上に位置する三つの穴１００,１０１,１０２に雌ねじ１１０を挿通することにより、第２状態を維持したが、この発明では、係止部がねじを有さない貫通穴を有し、第２状態において、略一直線上に位置する三つの穴に跨るように、ピンを挿通することにより、第２状態を維持していても良い。   In the torque limiter of the above embodiment, the locking portion 9 has the screw hole 101, and in the second state, by inserting the female screw 110 into the three holes 100, 101, 102 positioned substantially in a straight line, Although the second state is maintained, in the present invention, the locking portion has a through-hole that does not have a screw, and in the second state, the pin is inserted so as to straddle the three holes positioned substantially in a straight line. Therefore, the second state may be maintained.

また、上記実施形態のトルクリミッタでは、上記カバー部材８０は、付勢部材９０のボール９２が係止部９の外周面上を摺動することにより、軸方向に移動可能な構成であったが、この発明では、カバー部材は車輪を有し、この車輪が係止部の外周面を転がることにより、カバー部材が軸方向に移動可能な構成であっても良い。   In the torque limiter of the above embodiment, the cover member 80 is configured to be movable in the axial direction when the ball 92 of the urging member 90 slides on the outer peripheral surface of the locking portion 9. In the present invention, the cover member may have a wheel, and the cover member may be movable in the axial direction by rolling the outer peripheral surface of the locking portion.

また、上記実施形態のトルクリミッタでは、６つの付勢部材９０が、各列３つずつ、軸方向に２列に配置されたが、この発明では、付勢部材は、軸方向において、一列または３列以上に亘って配置されても良く、また、付勢部材は、各列において、周方向に互いに間隔をおいた状態で、２つまたは４つ以上存在していても良い。   Further, in the torque limiter of the above embodiment, the six biasing members 90 are arranged in two rows in the axial direction, with each row being three, but in the present invention, the biasing members are arranged in a row or in the axial direction. Three or more rows may be arranged, and two or four or more biasing members may be present in each row in a state of being spaced apart from each other in the circumferential direction.

また、上記実施形態のトルクリミッタでは、付勢部材９０が、つる巻ばね９１を有していたが、付勢部材が、つり巻ばねの替わりに、コイルばね、板バネ等のつる巻ばね以外のばねを有していていも良い。   In the torque limiter of the above embodiment, the urging member 90 has the helical spring 91. However, the urging member is not a helical spring such as a coil spring or a leaf spring, instead of the helical spring. It may have a spring.

また、上記実施形態のトルクリミッタでは、油圧拡張室２６に封入した油の油圧を用いて軸部材２と筒部材１との摩擦結合を行ったが、この発明では、液圧通路に封入した油以外の液体を用いて、軸部材と筒部材との摩擦結合を行っても良い。   In the torque limiter of the above embodiment, the shaft member 2 and the cylinder member 1 are frictionally coupled using the hydraulic pressure of the oil sealed in the hydraulic expansion chamber 26. In the present invention, the oil sealed in the hydraulic pressure passage is used. A fluid other than the above may be used for frictional coupling between the shaft member and the cylindrical member.

また、上記実施形態のトルクリミッタでは、環状の油圧拡張室２６が筒部材１に形成されたが、この発明では、環状の油圧拡張室が、軸部材に形成されて油圧拡張室を油圧で膨張させて、軸部材の外周面を筒部材の内周面に押圧するようにしても良い。この場合、例えば、図１において、玉軸受１７の右側に、油圧拡張室に連通すると共に径方向に延在する通路を形成して、軸方向において、軸部材の玉軸受１７の右側の外周面に、この通路に連通するシャーバルブ取付穴を形成すれば良い。このように、軸部材が、外部に露出する外周面を有している場合、軸部材に油圧拡張室を形成することができるのである。   In the torque limiter of the above embodiment, the annular hydraulic expansion chamber 26 is formed in the cylindrical member 1, but in the present invention, the annular hydraulic expansion chamber is formed in the shaft member and the hydraulic expansion chamber is hydraulically expanded. Then, the outer peripheral surface of the shaft member may be pressed against the inner peripheral surface of the cylindrical member. In this case, for example, in FIG. 1, on the right side of the ball bearing 17, a passage that communicates with the hydraulic expansion chamber and extends in the radial direction is formed, and the outer peripheral surface on the right side of the ball bearing 17 of the shaft member in the axial direction. In addition, a shear valve mounting hole communicating with this passage may be formed. Thus, when the shaft member has an outer peripheral surface exposed to the outside, the hydraulic expansion chamber can be formed in the shaft member.

本発明の一実施形態のトルクリミッタの軸方向の模式断面図である。It is a schematic cross section of the axial direction of the torque limiter of one Embodiment of this invention. 図１にｂで示す図１におけるシャーバルブの周辺の拡大断面図である。It is an expanded sectional view of the periphery of the shear valve in FIG. 1 shown by b in FIG. 付勢部材の構造を示す模式図である。It is a schematic diagram which shows the structure of a biasing member. 第１状態をとっている、この実施形態のトルクリミッタの軸方向の模式断面図である。It is a schematic cross section of the axial direction of the torque limiter of this embodiment which has taken the 1st state.

符号の説明Explanation of symbols

１ 筒部材
２ 軸部材
６ シャーバルブ
９ 係止部
１０ 第１の筒部材
１１ 第２の筒部材
２０ 軸部材の外周面
２１ 第１の筒部材の内周面
２６ 油圧拡張室
８０ カバー部材
９０ 付勢部材
１００ カバー部材の貫通穴
１０１ ねじ穴
１０２ 穴
１１０ ねじ部材
１３０ 凹部 DESCRIPTION OF SYMBOLS 1 Tube member 2 Shaft member 6 Shear valve 9 Locking part 10 1st tube member 11 2nd tube member 20 Outer surface of shaft member 21 Inner surface of 1st tube member 26 Hydraulic expansion chamber 80 Cover member 90 With Force member 100 Through hole of cover member 101 Screw hole 102 Hole 110 Screw member 130 Recess

Claims (5)

軸部材と、
この軸部材に外嵌した筒部材と
を備え、
上記筒部材および上記軸部材のうちの一方の部材は、
その一方の部材と、上記筒部材および上記軸部材のうちの他方の部材との間でトルクの伝達を行うときに、上記一方の部材の周面を上記他方の部材の周面に押し付けるための液圧通路と、
径方向の外方に開口するシャーバルブ取付穴と、径方向の外方に開口する位置決め部材挿通穴とを有する外周面と、
一端部が上記液圧通路に開口する一方、他端部が上記シャーバルブ取付穴に開口する油抜き孔と、
一端部が上記油抜き孔に連通する一方、他端部が密封されたチューブを有し、かつ、上記シャーバルブ取付穴に取り付けられたシャーバルブと
を有し、
上記他方の部材は、上記シャーバルブを係止可能であると共に、貫通穴を有する係止部を有し、
上記係止部の径方向の外方に位置すると共に、貫通穴を有する環状のカバー部材を備え、
上記カバー部材は、
軸方向に移動可能であり、かつ、
上記カバー部材が上記シャーバルブを径方向に覆う第１状態と、上記カバー部材が上記シャーバルブ取付穴に軸方向に間隔をおいて位置すると共に、上記カバー部材の上記貫通穴、上記係止部の上記貫通穴および上記一方の部材の上記位置決め部材挿通穴が、略径方向に略一直線上に位置する第２状態とをとることが可能であることを特徴とするトルクリミッタ。 A shaft member;
A cylindrical member fitted around the shaft member;
One of the cylindrical member and the shaft member is
When the torque is transmitted between the one member and the other member of the cylindrical member and the shaft member, the peripheral surface of the one member is pressed against the peripheral surface of the other member. A hydraulic passage,
An outer peripheral surface having a shear valve mounting hole that opens radially outward, and a positioning member insertion hole that opens radially outward;
One end portion opens to the hydraulic pressure passage, while the other end portion opens to the shear valve mounting hole,
One end portion communicates with the oil drain hole, the other end portion has a sealed tube, and a shear valve attached to the shear valve attachment hole,
The other member is capable of locking the shear valve and has a locking portion having a through hole,
An annular cover member having a through hole is located outside the locking portion in the radial direction,
The cover member is
Movable in the axial direction, and
A first state in which the cover member covers the shear valve in the radial direction; and the cover member is positioned in the shear valve mounting hole at an axial interval, and the through hole of the cover member and the locking portion The torque limiter characterized in that the through hole of the first member and the positioning member insertion hole of the one member can take a second state which is positioned substantially in a straight line in a substantially radial direction. 請求項１に記載のトルクリミッタにおいて、
一端部が、上記カバー部材に対して軸方向に移動不可能に上記カバー部材に取り付けられる一方、他端部が、上記係止部の径方向の外方の表面上を軸方向に摺動可能であり、かつ、上記カバー部材を上記係止部の上記表面に対して径方向の外方に付勢する付勢部材を備え、
上記係止部の上記表面は、上記付勢部材の上記他端部を係止可能な一以上の凹部を有することを特徴とするトルクリミッタ。 The torque limiter according to claim 1,
One end is attached to the cover member so that it cannot move in the axial direction with respect to the cover member, while the other end is slidable on the radially outer surface of the locking portion in the axial direction. And a biasing member that biases the cover member radially outward relative to the surface of the locking portion,
The torque limiter, wherein the surface of the locking portion has one or more recesses capable of locking the other end of the biasing member. 請求項２に記載のトルクリミッタにおいて、
上記一以上の凹部は、上記第２状態において、上記係止部の上記表面において上記付勢部材の上記他端部が接触する箇所に位置する凹部を含むことを特徴とするトルクリミッタ。 The torque limiter according to claim 2,
The one or more recesses include a recess located at a position where the other end of the urging member contacts with the surface of the locking portion in the second state. 請求項１乃至３のいずれか１つに記載のトルクリミッタにおいて、
上記第２状態において、上記係止部の上記貫通穴を貫通すると共に、上記カバー部材の上記貫通穴の少なくとも一部および上記一方の部材の上記位置決め部材挿通穴の少なくとも一部に位置するピンを備え、
上記第２状態において、上記ピンによって、上記一方の部材に対する上記他方の部材の周方向の相対位置の範囲が制限されることを特徴とするトルクリミッタ。 The torque limiter according to any one of claims 1 to 3,
In the second state, a pin that penetrates the through hole of the locking portion and is located in at least a part of the through hole of the cover member and at least a part of the positioning member insertion hole of the one member Prepared,
In the second state, a range of a relative position in a circumferential direction of the other member with respect to the one member is limited by the pin. 請求項１乃至３のいずれか１項に記載のトルクリミッタにおいて、
上記係止部の上記貫通穴は、雌ねじが形成されたねじ穴であり、
上記カバー部材の上記貫通穴は、上記雌ねじに螺合するねじ部材が通過可能であり、
上記位置決め部材挿通穴は、上記ねじ部材の少なくとも一部が挿通可能であり、
上記第２状態において、上記係止部の上記ねじ穴に螺合すると共に、上記カバー部材の上記貫通穴の少なくとも一部および上記一方の部材の上記位置決め部材挿通穴の少なくとも一部に位置する上記ねじ部材を備え、
上記第２状態において、上記ねじ部材によって、上記一方の部材に対する上記他方の部材の周方向の相対位置の範囲が制限されることを特徴とするトルクリミッタ。 The torque limiter according to any one of claims 1 to 3,
The through hole of the locking portion is a screw hole in which a female screw is formed,
The through hole of the cover member can pass through a screw member that is screwed into the female screw,
In the positioning member insertion hole, at least a part of the screw member can be inserted,
In the second state, the screw member is screwed into the screw hole of the locking portion, and is located in at least a part of the through hole of the cover member and at least a part of the positioning member insertion hole of the one member. A screw member;
In the second state, a range of a relative position in a circumferential direction of the other member with respect to the one member is limited by the screw member.
JP2008218359A 2008-08-27 2008-08-27 Torque limiter Expired - Fee Related JP5195162B2 (en)

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