JP5087019B2 - Viscous fluid coupling - Google Patents

Viscous fluid coupling Download PDF

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JP5087019B2
JP5087019B2 JP2009015765A JP2009015765A JP5087019B2 JP 5087019 B2 JP5087019 B2 JP 5087019B2 JP 2009015765 A JP2009015765 A JP 2009015765A JP 2009015765 A JP2009015765 A JP 2009015765A JP 5087019 B2 JP5087019 B2 JP 5087019B2
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cover
housing body
filling chamber
viscous fluid
fluid filling
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JP2010174931A (en
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文男 大島
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Showa Corp
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Showa Corp
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Description

本発明は粘性流体カップリングに関する。   The present invention relates to a viscous fluid coupling.

車両の粘性流体カップリングとして、特許文献１に記載の如く、ハウジング本体の一端開口部に設けた嵌合用穴にカバーを嵌合し、ハウジング本体の他端窄まり部とカバーのボス部にインナーシャフトを枢支し、ハウジング本体の内周とインナーシャフトの外周の間の環状空間を流体充填室とし、この流体充填室をカバーにより閉鎖するとともに、カバーの外周環状溝に装填したＯリングにより液密に封止し、第１プレートと第２プレートを流体充填室の内部に交互に積層配置し、第１プレートの外周のスプライン歯をハウジング本体の内周に設けたスプライン溝に嵌合するとともに、第２プレートの内周のスプライン歯をインナーシャフトの外周に設けたスプライン溝に嵌合し、流体充填室に充填した粘性流体により、ハウジング本体とインナーシャフトの間で動力を伝達するものがある。   As a viscous fluid coupling for a vehicle, as described in Patent Document 1, a cover is fitted into a fitting hole provided in one end opening of a housing body, and an inner end is formed between the other end constricted portion of the housing body and a boss portion of the cover. A shaft is pivotally supported, and an annular space between the inner periphery of the housing body and the outer periphery of the inner shaft is used as a fluid filling chamber. The fluid filling chamber is closed by a cover, and liquid is provided by an O-ring loaded in the outer peripheral annular groove of the cover. The first plate and the second plate are alternately stacked inside the fluid filling chamber, and the spline teeth on the outer periphery of the first plate are fitted in the spline grooves provided on the inner periphery of the housing body. The spline teeth on the inner circumference of the second plate are fitted into the spline grooves provided on the outer circumference of the inner shaft, and the housing body and the ink are filled with the viscous fluid filled in the fluid filling chamber. There is to transmit power between the donor shaft.

この粘性流体カップリングでは、ハウジング本体とインナーシャフトの高回転が続くハンプ、又は第１プレートと第２プレートが焼付く故障モード等に至ると、粘性流体が発熱膨張して流体充填室が高圧になり、これを放置するとハウジング本体の損傷を生ずる。そこで、特許文献２に記載の如く、ハウジング本体にリリーフ弁を設け、流体充填室が高圧になったとき、リリーフ弁によりその圧力を外部空間に逃がすものが提案されている。   In this viscous fluid coupling, when a hump in which the housing body and the inner shaft continue to rotate at a high speed or a failure mode in which the first plate and the second plate are seized, the viscous fluid is heated and expanded, and the fluid filling chamber becomes high pressure. If left untreated, the housing body will be damaged. Therefore, as disclosed in Patent Document 2, a relief valve has been proposed in which a relief valve is provided in the housing body, and when the fluid filling chamber becomes high pressure, the relief valve releases the pressure to the external space.

特公平7-907047-90704 特許第4198961Patent No. 4198961

粘性流体カップリングにおいて、流体充填室の高圧を逃がすために、特許文献２に記載の如くのリリーフ弁を設ける場合には、構造が複雑になり、部品点数が多く、コスト高になる。また、リリーフ圧力の調整も困難である。   In the viscous fluid coupling, in order to release the high pressure in the fluid filling chamber, when a relief valve as described in Patent Document 2 is provided, the structure is complicated, the number of parts is large, and the cost is increased. In addition, it is difficult to adjust the relief pressure.

本発明の課題は、粘性流体カップリングにおいて、流体充填室の高圧を逃がす構造を簡素化してコスト低減しながら、リリーフ圧力のばらつきを小さくし、更にリリーフ圧力の調整も容易にすることにある。   SUMMARY OF THE INVENTION An object of the present invention is to reduce the variation in relief pressure and facilitate the adjustment of the relief pressure while simplifying the structure for releasing the high pressure in the fluid filling chamber in the viscous fluid coupling and reducing the cost.

請求項１の発明は、ハウジング本体の一端開口部に設けた嵌合用穴にカバーを嵌合し、ハウジング本体の他端窄まり部とカバーのボス部にインナーシャフトを枢支し、ハウジング本体の内周とインナーシャフトの外周の間の環状空間を流体充填室とし、この流体充填室をカバーにより閉鎖するとともに、カバーの外周環状溝に装填したＯリングにより液密に封止し、第１プレートと第２プレートを流体充填室の内部に交互に積層配置し、第１プレートの外周のスプライン歯をハウジング本体の内周に設けたスプライン溝に嵌合するとともに、第２プレートの内周のスプライン歯をインナーシャフトの外周に設けたスプライン溝に嵌合し、流体充填室に充填した粘性流体により、ハウジング本体とインナーシャフトの間で動力を伝達する粘性流体カップリングにおいて、カバーの外周の一部に切除部を設け、流体充填室の一定以上の圧力を受けるＯリングが外周環状溝からこの切除部にはみ出し変形するようにしたものである。   According to the first aspect of the present invention, the cover is fitted into the fitting hole provided in the one end opening of the housing body, the inner shaft is pivotally supported on the other end narrowed portion of the housing body and the boss portion of the cover, An annular space between the inner periphery and the outer periphery of the inner shaft is used as a fluid filling chamber. The fluid filling chamber is closed by a cover, and is liquid-tightly sealed by an O-ring loaded in the outer peripheral annular groove of the cover. And the second plate are alternately stacked inside the fluid filling chamber, the spline teeth on the outer periphery of the first plate are fitted in the spline grooves provided on the inner periphery of the housing body, and the splines on the inner periphery of the second plate A viscous flow in which teeth are fitted in a spline groove provided on the outer periphery of the inner shaft and power is transmitted between the housing body and the inner shaft by the viscous fluid filled in the fluid filling chamber. In the coupling, a part of the outer periphery of the cover to provide a cutout, in which O-ring receiving a certain level of pressure of the fluid-filled chamber is so deformed protruding to the cut portion from the outer annular groove.

請求項２の発明は、請求項１の発明において更に、前記カバーがハウジング本体の嵌合用穴に係止する止め輪により固定化されるとともに、該カバーに設けた粘性流体の注入孔にシール用ボルトを封着してなるとき、該カバーにおけるシール用ボルトを通る概ね半径線上に前記切除部を設け、シール用ボルトの頭部を挟む両側に止め輪の両端部を配置してなるようにしたものである。   According to a second aspect of the present invention, in addition to the first aspect of the invention, the cover is fixed by a retaining ring that engages with a fitting hole of the housing body, and the viscous fluid injection hole provided in the cover is sealed. When the bolt is sealed, the cut portion is provided on a radial line that passes through the sealing bolt in the cover, and both ends of the retaining ring are arranged on both sides of the head of the sealing bolt. Is.

（請求項１）
(a)カバーの外周の一部に切除部を設け、流体充填室の一定以上の圧力を受けるＯリングが外周環状溝からこの切除部にはみ出し変形するものとした。従って、ハンプ又は故障モード等で流体充填室が高圧になると、この高圧を受けるＯリングがカバーの外周環状溝から切除部、具体的にはこの切除部がハウジング本体の嵌合用穴の穴面に対して形成する隙間にはみ出し変形（又ははみ出し破損）することにより、このはみ出し変形部のシール性能を減じ、その圧力をこのはみ出し変形部を生じた切除部の隙間から外部空間に逃がすものになる。カバーの外周の一部に切除部を設けるだけの簡素な構造により、専用部品を用いることもなく、流体充填室の高圧を逃がすことができ、コスト低減できる。 (Claim 1)
(a) A cut portion is provided on a part of the outer periphery of the cover, and an O-ring receiving a pressure of a certain level or more in the fluid filling chamber protrudes from the outer annular groove to the cut portion and is deformed. Therefore, when the fluid filling chamber becomes high pressure due to hump or failure mode, etc., the O-ring receiving this high pressure is cut from the outer peripheral annular groove of the cover, specifically, this cut portion is on the hole surface of the fitting hole of the housing body. On the other hand, by protruding and deforming (or protruding damage) in the gap formed, the sealing performance of the protruding deformed portion is reduced, and the pressure is released to the external space from the gap of the excised portion where the protruding deformed portion is generated. With a simple structure in which a cut portion is provided on a part of the outer periphery of the cover, high pressure in the fluid filling chamber can be released without using dedicated parts, and costs can be reduced.

(b)カバーの外周の一部においてだけ、カバーの周方向、半径方向に沿う切除部の長さ、深さを設定することにより、リリーフ圧力を精度良く管理できるから、リリーフ圧力のばらつきを小さくし、更にリリーフ圧力の調整も容易にすることができる。カバーの周方向、半径方向に沿う切除部の長さ、深さは多様に調整でき、リリーフ圧力の調整幅は広い。このとき、カバーの外周の切除部を除く他の広い範囲では、その外径の設定はラフで足りる。   (b) By setting the length and depth of the cut part along the circumferential direction and radial direction of the cover only on a part of the outer periphery of the cover, the relief pressure can be managed with high accuracy, so the variation in relief pressure is reduced. In addition, the relief pressure can be easily adjusted. The length and depth of the cut portion along the circumferential direction and radial direction of the cover can be adjusted in various ways, and the adjustment range of the relief pressure is wide. At this time, in the wide range other than the cut portion on the outer periphery of the cover, the setting of the outer diameter is sufficient.

(c)カバーの外周の切除部を除く他の広い範囲では、その外周がハウジング本体の嵌合用穴の穴面に対して形成する隙間が微小になり、Ｏリングはカバーの外周環状溝の溝内に安定的に確保される。従って、Ｏリングを確保するカバーの外周環状溝の溝深さを小さ目にし、かつＯリングの断面を小さ目にしながら、流体充填室を液密に封止できる。   (c) In a wide range other than the cutout portion on the outer periphery of the cover, the gap formed on the outer periphery with respect to the hole surface of the fitting hole of the housing body is very small, and the O-ring is a groove of the outer peripheral annular groove of the cover. Is stably secured within. Therefore, the fluid filling chamber can be liquid-tightly sealed while reducing the groove depth of the outer peripheral annular groove of the cover for securing the O-ring and reducing the cross-section of the O-ring.

（請求項２）
(d)カバーにおけるシール用ボルトを通る概ね半径線上に切除部を設け、シール用ボルトの頭部を挟む両側に止め輪の両端部を配置した。従って、カバーに設けた切除部は止め輪により遮られることなく、常時外部空間に臨み、流体充填室の高圧をこの切除部の隙間からスムースに確実に外部空間に逃がすことができる。 (Claim 2)
(d) A cut-out portion was provided on a radial line passing through the sealing bolt in the cover, and both ends of the retaining ring were disposed on both sides of the sealing bolt head. Therefore, the cut portion provided in the cover can always face the external space without being blocked by the retaining ring, and the high pressure in the fluid filling chamber can be smoothly and surely released from the gap of the cut portion to the external space.

図１は粘性流体カップリングを示す全体断面図である。FIG. 1 is an overall sectional view showing a viscous fluid coupling. 図２は図１の側面図である。FIG. 2 is a side view of FIG. 図３はカバーを示す半断面図である。FIG. 3 is a half sectional view showing the cover. 図４はカバーを示す半側面図である。FIG. 4 is a half side view showing the cover. 図５は図１の高圧リリーフ構造を示す要部断面図である。FIG. 5 is a cross-sectional view of the main part showing the high-pressure relief structure of FIG. 図６は高圧リリーフ状態を示す断面図である。FIG. 6 is a cross-sectional view showing a high-pressure relief state.

図１、図２に示す粘性流体カップリング１は、入力側動力伝達部材と出力側動力伝達部材との間に介装され、入力側動力伝達部材が連結されるハウジング１０と、出力側動力伝達部材が連結されるインナーシャフト２０を有する。   A viscous fluid coupling 1 shown in FIGS. 1 and 2 is interposed between an input side power transmission member and an output side power transmission member, and a housing 10 to which the input side power transmission member is connected, and an output side power transmission. It has the inner shaft 20 with which a member is connected.

ハウジング１０は、ハウジング本体１１とカバー１２とからなる。ハウジング本体１１は、一端開口且つ他端窄まり状（他端は完全閉塞状をなす閉塞部でも可）をなす筒状体からなり、この筒状体の他端窄まり部の外側端面に入力側動力伝達部材の取付用ねじ孔１１Ａ等を備える。カバー１２は、ハウジング本体１１の筒状体の一端開口部に設けた嵌合用穴１１Ｂに嵌合されるボス付板状体からなり、板状体の外周環状溝１２Ｂに装填したＯリング１３を嵌合用穴１１Ｂに液密に嵌着する。ハウジング本体１１の嵌合用穴１１Ｂに嵌合されたカバー１２は、嵌合用穴１１Ｂの内方に設けられる後述のスプライン溝４２の端面と、嵌合用穴１１Ｂの内周環状溝に係止した止め輪１４とに挟まれて固定化される。尚、ハウジング本体１１の筒状体の他端窄まり部の中心部にはインナーシャフト２０が挿入される軸挿入用孔１１Ｃが設けられ、インナーシャフト２０のための軸受１５、シール部材１６がこの軸挿入用孔１１Ｃの内周装填部に装填される。軸受１５は、軸挿入用孔１１Ｃの内周環状溝に係止した止め輪１７により抜け止めされる。また、カバー１２のボス部の中心部にはインナーシャフト２０が挿通される軸挿通用孔１２Ａが設けられ、インナーシャフト２０のための軸受１８、シール部材１９がこの軸挿通用孔１２Ａの内周装填部に装填される。   The housing 10 includes a housing body 11 and a cover 12. The housing body 11 is formed of a cylindrical body having an opening at one end and a constricted shape at the other end (the other end may be a closed portion that is completely closed), and input to the outer end surface of the constricted portion at the other end of the tubular body. A side power transmission member mounting screw hole 11A and the like are provided. The cover 12 is a plate-like body with a boss that is fitted into a fitting hole 11B provided in one end opening of the cylindrical body of the housing body 11, and an O-ring 13 loaded in the outer peripheral annular groove 12B of the plate-like body is provided. It fits liquid-tightly into the fitting hole 11B. The cover 12 fitted in the fitting hole 11B of the housing main body 11 is a stopper locked to an end surface of a spline groove 42 to be described later provided inside the fitting hole 11B and an inner circumferential annular groove of the fitting hole 11B. It is sandwiched between the ring 14 and fixed. A shaft insertion hole 11C into which the inner shaft 20 is inserted is provided at the center of the other end constricted portion of the cylindrical body of the housing body 11, and the bearing 15 and the seal member 16 for the inner shaft 20 It is loaded into the inner circumferential loading portion of the shaft insertion hole 11C. The bearing 15 is prevented from coming off by a retaining ring 17 locked in the inner circumferential annular groove of the shaft insertion hole 11C. A shaft insertion hole 12A through which the inner shaft 20 is inserted is provided at the center of the boss portion of the cover 12, and a bearing 18 and a seal member 19 for the inner shaft 20 are provided on the inner periphery of the shaft insertion hole 12A. Loaded in the loading section.

インナーシャフト２０は、ハウジング１０に枢支される。インナーシャフト２０は、中空軸からなり、ハウジング本体１１の軸挿入用孔１１Ｃに挿入されるとともに、カバー１２の軸挿通用孔１２Ａに挿通され、ハウジング本体１１、カバー１２のそれぞれに装填した軸受１５、１８に枢支されるとともに、ハウジング本体１１、カバー１２のそれぞれに装填したシール部材１６、１９に液密に摺接する。インナーシャフト２０は、中空軸の内径部に出力側動力伝達部材のための取付用セレーション２１を備える。   The inner shaft 20 is pivotally supported by the housing 10. The inner shaft 20 is formed of a hollow shaft and is inserted into the shaft insertion hole 11C of the housing main body 11 and is inserted into the shaft insertion hole 12A of the cover 12 so as to be loaded in the housing main body 11 and the cover 12 respectively. , 18 and in fluid-tight sliding contact with seal members 16, 19 loaded in the housing body 11 and the cover 12, respectively. The inner shaft 20 includes a mounting serration 21 for the output side power transmission member on the inner diameter portion of the hollow shaft.

粘性流体カップリング１は、ハウジング本体１１の内周とインナーシャフト２０の外周の間の環状空間を流体充填室３０とする。流体充填室３０は、ハウジング１０を構成するハウジング本体１１の後述するスプライン溝４２が設けられる内周と、インナーシャフト２０の後述するスプライン溝５２が設けられる外周の間の環状空間を、ハウジング本体１１の嵌合用穴１１Ｂ（開口部）に嵌合されたカバー１２により閉鎖して区画される。流体充填室３０は、ハウジング本体１１の軸挿入用孔１１Ｃに装填したシール部材１６、カバー１２の軸挿通用孔１２Ａに装填したシール部材１９、カバー１２の外周環状溝１２Ｂに装填したＯリング１３により外部に対し液密に封止される。   The viscous fluid coupling 1 uses an annular space between the inner periphery of the housing body 11 and the outer periphery of the inner shaft 20 as a fluid filling chamber 30. The fluid filling chamber 30 has an annular space between the inner periphery of the housing main body 11 constituting the housing 10 where a spline groove 42 described later is provided and the outer periphery of the inner shaft 20 provided with a spline groove 52 described later. And closed by a cover 12 fitted in the fitting hole 11B (opening). The fluid filling chamber 30 includes a seal member 16 loaded in the shaft insertion hole 11C of the housing body 11, a seal member 19 loaded in the shaft insertion hole 12A of the cover 12, and an O-ring 13 loaded in the outer peripheral annular groove 12B of the cover 12. Is sealed liquid-tight to the outside.

粘性流体カップリング１は、多数の第１プレート４０と、多数の第２プレート５０を、流体充填室３０の内部に、それらの表面が互いに僅かな隙間を保つように交互に積層配置している。各第１プレート４０の外周のスプライン歯４１を、ハウジング本体１１の筒状体の内周の軸方向に設けたスプライン溝４２に嵌合する。各第２プレート５０の内周のスプライン歯５１を、インナーシャフト２０の外周の軸方向に設けたスプライン溝５２に嵌合する。   In the viscous fluid coupling 1, a large number of first plates 40 and a large number of second plates 50 are alternately stacked in the fluid filling chamber 30 so that their surfaces maintain a slight gap therebetween. . The spline teeth 41 on the outer periphery of each first plate 40 are fitted into spline grooves 42 provided in the axial direction on the inner periphery of the cylindrical body of the housing body 11. The spline teeth 51 on the inner periphery of each second plate 50 are fitted into spline grooves 52 provided in the axial direction on the outer periphery of the inner shaft 20.

粘性流体カップリング１は、流体充填室３０にシリコンオイル等の粘性流体Ｌを充填する。ハウジング１０を構成するカバー１２の板状体に粘性流体Ｌの注入孔６０を設け、この注入孔６０に封着されるシール用ボルト６１によりこの注入孔６０を液密に封止する。尚、カバー１２の板状体は、粘性流体Ｌが注入される流体充填室３０の空気抜きに供される空気抜き孔６２を備え、この空気抜き孔６２をシール用ボール６３により液密に封止する。   The viscous fluid coupling 1 fills the fluid filling chamber 30 with a viscous fluid L such as silicone oil. An injection hole 60 for the viscous fluid L is provided in the plate-like body of the cover 12 constituting the housing 10, and the injection hole 60 is liquid-tightly sealed by a sealing bolt 61 sealed to the injection hole 60. The plate-like body of the cover 12 is provided with an air vent hole 62 used for venting the fluid filling chamber 30 into which the viscous fluid L is injected, and the air vent hole 62 is liquid-tightly sealed with a sealing ball 63.

従って、粘性流体カップリング１は、入力側動力伝達部材に連結されているハウジング１０が回転駆動され、第１プレート４０が回転すると、この第１プレート４０とともに流体充填室３０内の粘性流体Ｌが摩擦力と剪断力を受けて回動誘導し、それに伴なって第２プレート５０が回転する。これにより、第２プレート５０がスプライン嵌合しているインナーシャフト２０が回転し、インナーシャフト２０に連結されている出力側動力伝達部材に回転トルクが伝達される。   Therefore, in the viscous fluid coupling 1, when the housing 10 connected to the input-side power transmission member is driven to rotate and the first plate 40 rotates, the viscous fluid L in the fluid filling chamber 30 is moved together with the first plate 40. The second plate 50 is rotated by receiving frictional force and shearing force, and the second plate 50 is rotated accordingly. Thereby, the inner shaft 20 in which the second plate 50 is spline-fitted rotates, and the rotational torque is transmitted to the output-side power transmission member connected to the inner shaft 20.

しかるに、粘性流体カップリング１にあっては、ハンプ又は故障モード等で流体充填室３０が高圧になるとき、この高圧を逃がす高圧リリーフ構造を以下の如くに備える。   However, the viscous fluid coupling 1 is provided with a high-pressure relief structure for releasing the high pressure when the fluid filling chamber 30 becomes a high pressure in a hump or failure mode or the like as follows.

即ち、粘性流体カップリング１は、図３〜図５に示す如く、ハウジング本体１１の嵌合用穴１１Ｂに嵌合されるカバー１２の外周において、カバー１２の外周の一部に切除部７０を設ける。切除部７０は、円弧面状切欠部（平面状切欠部、凹溝状切欠部等でも可）からなり、Ｏリング１３が装填される外周環状溝１２Ｂの溝深さよりも相当に浅く設定される。切除部７０は、ハウジング本体１１の嵌合用穴１１Ｂに嵌合するカバー１２の外周において、このカバー１２を固定化する止め輪１４に接する外側面と、Ｏリング１３のための環状外周溝１２Ｂとの間の外周の一部に設けられ、流体充填室３０の一定以上の圧力を受けるＯリング１３が外周環状溝１２Ｂからこの切除部７０、具体的にはこの切除部７０がハウジング本体１１の嵌合用穴１１Ｂの穴面に対して形成する隙間Ｋ（図５、図６）から外部空間に向けてはみ出し変形（又ははみ出し破損）可能にする（図６）。尚、切除部７０は、図６に示す如く、カバー１２の外周の周方向同一位置で、カバー１２の流体充填室３０に接する内側面と、Ｏリング１３のための外周環状溝１２Ｂとの間の外周にまで延在されていても良い。   That is, the viscous fluid coupling 1 is provided with a cutout 70 at a part of the outer periphery of the cover 12 on the outer periphery of the cover 12 fitted in the fitting hole 11B of the housing body 11 as shown in FIGS. . The cut portion 70 is formed of a circular arc-shaped cutout (a flat cutout, a concave cutout, etc.), and is set to be considerably shallower than the groove depth of the outer circumferential groove 12B in which the O-ring 13 is loaded. . The cut-out portion 70 is formed on the outer periphery of the cover 12 that fits into the fitting hole 11B of the housing body 11, the outer surface that is in contact with the retaining ring 14 that fixes the cover 12, and the annular outer circumferential groove 12 B for the O-ring 13. The O-ring 13 which is provided at a part of the outer periphery between the two and receives the pressure of the fluid filling chamber 30 above a certain level is cut from the outer peripheral annular groove 12B to the cut portion 70, specifically, the cut portion 70 is fitted to the housing main body 11. The gap K (FIGS. 5 and 6) formed with respect to the hole surface of the joint hole 11B is allowed to protrude outward (or protrude from damage) toward the external space (FIG. 6). As shown in FIG. 6, the cut portion 70 is located between the inner surface of the cover 12 that contacts the fluid filling chamber 30 and the outer peripheral annular groove 12 </ b> B for the O-ring 13 at the same circumferential position on the outer periphery of the cover 12. It may be extended to the outer periphery.

更に、粘性流体カップリング１は、カバー１２における注入孔６０及びシール用ボルト６１を通る概ね半径線上に切除部７０を設け、シール用ボルト６１の頭部６１Ａを挟む両側にＣ形（Ｅ形でも可）止め輪１４の合口の両端部１４Ａ、１４Ｂを配置してなるものでも良い（図２）。   Further, the viscous fluid coupling 1 is provided with a cut portion 70 substantially on a radial line passing through the injection hole 60 and the sealing bolt 61 in the cover 12, and C-shaped (also E-shaped) on both sides sandwiching the head 61 </ b> A of the sealing bolt 61. Possible) Both ends 14A and 14B of the abutment of the retaining ring 14 may be arranged (FIG. 2).

本実施例によれば以下の作用効果を奏する。
(a)カバー１２の外周の一部に切除部７０を設け、流体充填室３０の一定以上の圧力を受けるＯリング１３が外周環状溝１２Ｂからこの切除部７０にはみ出し変形するものとした。従って、ハンプ又は故障モード等で流体充填室３０が高圧になると、この高圧を受けるＯリング１３がカバー１２の外周環状溝１２Ｂから切除部７０、具体的にはこの切除部７０がハウジング本体１１の嵌合用穴１１Ｂの穴面に対して形成する隙間Ｋにはみ出し変形（又ははみ出し破損）することにより、このはみ出し変形部１３Ａのシール性能を減じ、その圧力をこのはみ出し変形部１３Ａを生じた切除部７０の隙間Ｋから外部空間に逃がすものになる。カバー１２の外周の一部に切除部７０を設けるだけの簡素な構造により、専用部品を用いることもなく、流体充填室３０の高圧を逃がすことができ、コスト低減できる。 According to the present embodiment, the following operational effects can be obtained.
(a) The cut portion 70 is provided on a part of the outer periphery of the cover 12, and the O-ring 13 that receives a certain pressure or more in the fluid filling chamber 30 protrudes from the outer annular groove 12 </ b> B to the cut portion 70 and is deformed. Therefore, when the fluid filling chamber 30 becomes a high pressure due to a hump or a failure mode, the O-ring 13 that receives the high pressure is removed from the outer peripheral annular groove 12B of the cover 12 by the cut portion 70, specifically, the cut portion 70 is formed on the housing body 11. By protruding and deforming (or protruding damage) into the gap K formed with respect to the hole surface of the fitting hole 11B, the sealing performance of the protruding deformed portion 13A is reduced, and the pressure is removed by the cut portion where the protruding deformed portion 13A is generated. It will escape from the gap K of 70 to the external space. With a simple structure in which the cut portion 70 is simply provided on a part of the outer periphery of the cover 12, high pressure in the fluid filling chamber 30 can be released without using dedicated parts, and costs can be reduced.

(b)カバー１２の外周の一部においてだけ、カバー１２の周方向、半径方向に沿う切除部７０の長さＬ、深さＨ（図３、図４）を設定することにより、リリーフ圧力を精度良く管理できるから、リリーフ圧力のばらつきを小さくし、更にリリーフ圧力の調整も容易にすることができる。カバー１２の周方向、半径方向に沿う切除部７０の長さＬ、深さＨ（図３、図４）は多様に調整でき、リリーフ圧力の調整幅は広い。このとき、カバー１２の外周の切除部７０を除く他の広い範囲では、その外径の設定はラフで足りる。   (b) By setting the length L and the depth H (FIGS. 3 and 4) of the cut portion 70 along the circumferential direction and the radial direction of the cover 12 only at a part of the outer periphery of the cover 12, the relief pressure is reduced. Since it can be managed with high accuracy, variations in the relief pressure can be reduced and the relief pressure can be easily adjusted. The length L and the depth H (FIGS. 3 and 4) of the cut portion 70 along the circumferential direction and the radial direction of the cover 12 can be adjusted in various ways, and the adjustment range of the relief pressure is wide. At this time, in the wide range other than the cut portion 70 on the outer periphery of the cover 12, the setting of the outer diameter is sufficient.

(c)カバー１２の外周の切除部７０を除く他の広い範囲では、その外周がハウジング本体１１の嵌合用穴１１Ｂの穴面に対して形成する隙間Ｋが微小になり、Ｏリング１３はカバー１２の外周環状溝１２Ｂの溝内に安定的に確保される。従って、Ｏリング１３を確保するカバー１２の外周環状溝１２Ｂの溝深さを小さ目にし、かつＯリング１３の断面を小さ目にしながら、流体充填室３０を液密に封止できる。   (c) In a wide range other than the cutout portion 70 on the outer periphery of the cover 12, a gap K formed by the outer periphery with respect to the hole surface of the fitting hole 11B of the housing body 11 becomes minute, and the O-ring 13 is covered with the cover. It is ensured stably in the grooves of the 12 outer peripheral annular grooves 12B. Therefore, the fluid filling chamber 30 can be liquid-tightly sealed while reducing the groove depth of the outer peripheral annular groove 12B of the cover 12 for securing the O-ring 13 and reducing the cross section of the O-ring 13.

(d)カバー１２におけるシール用ボルト６１を通る概ね半径線上に切除部７０を設け、シール用ボルト６１の頭部６１Ａを挟む両側に止め輪１４の両端部１４Ａ、１４Ｂを配置した。従って、カバー１２に設けた切除部７０は止め輪１４により遮られることなく、常時外部空間に臨み、流体充填室３０の高圧をこの切除部７０の隙間Ｋからスムースに確実に外部空間に逃がすことができる。   (d) The cut portion 70 is provided on a substantially radial line passing through the sealing bolt 61 in the cover 12, and both end portions 14 </ b> A and 14 </ b> B of the retaining ring 14 are disposed on both sides of the head 61 </ b> A of the sealing bolt 61. Therefore, the excision part 70 provided in the cover 12 always faces the external space without being blocked by the retaining ring 14, and the high pressure in the fluid filling chamber 30 is smoothly and surely released from the gap K of the excision part 70 to the external space. Can do.

以上、本発明の実施例を図面により詳述したが、本発明の具体的な構成はこの実施例に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。   The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

本発明は、粘性流体カップリングにおいて、流体充填室の高圧を逃がす構造を簡素化してコスト低減しながら、リリーフ圧力のばらつきを小さくし、更にリリーフ圧力の調整も容易にすることができる。   According to the present invention, in the viscous fluid coupling, the structure for releasing the high pressure in the fluid filling chamber can be simplified to reduce the cost, the variation in the relief pressure can be reduced, and the relief pressure can be easily adjusted.

１ 粘性流体カップリング
１０ ハウジング
１１ ハウジング本体
１１Ｂ 嵌合用穴
１２ カバー
１２Ｂ 外周環状溝
１３ Ｏリング
１４ 止め輪
２０ インナーシャフト
３０ 流体充填室
４０ 第１プレート
４１ スプライン歯
４２ スプライン溝
５０ 第２プレート
５１ スプライン歯
５２ スプライン溝
６０ 注入孔
６１ シール用ボルト
７０ 切除部 DESCRIPTION OF SYMBOLS 1 Viscous fluid coupling 10 Housing 11 Housing main body 11B Fitting hole 12 Cover 12B Peripheral annular groove 13 O ring 14 Retaining ring 20 Inner shaft 30 Fluid filling chamber 40 First plate 41 Spline teeth 42 Spline grooves 50 Second plate 51 Spline teeth 52 Spline groove 60 Injection hole 61 Sealing bolt 70 Cutting part

Claims (2)

ハウジング本体の一端開口部に設けた嵌合用穴にカバーを嵌合し、
ハウジング本体の他端窄まり部とカバーのボス部にインナーシャフトを枢支し、
ハウジング本体の内周とインナーシャフトの外周の間の環状空間を流体充填室とし、この流体充填室をカバーにより閉鎖するとともに、カバーの外周環状溝に装填したＯリングにより液密に封止し、
第１プレートと第２プレートを流体充填室の内部に交互に積層配置し、
第１プレートの外周のスプライン歯をハウジング本体の内周に設けたスプライン溝に嵌合するとともに、第２プレートの内周のスプライン歯をインナーシャフトの外周に設けたスプライン溝に嵌合し、
流体充填室に充填した粘性流体により、ハウジング本体とインナーシャフトの間で動力を伝達する粘性流体カップリングにおいて、
カバーの外周の一部に切除部を設け、流体充填室の一定以上の圧力を受けるＯリングが外周環状溝からこの切除部にはみ出し変形することを特徴とする粘性流体カップリング。 Fit the cover into the fitting hole provided in the one end opening of the housing body,
The inner shaft is pivotally supported on the other end constricted part of the housing body and the boss part of the cover,
An annular space between the inner periphery of the housing body and the outer periphery of the inner shaft is used as a fluid filling chamber, and the fluid filling chamber is closed with a cover, and liquid-tightly sealed with an O-ring loaded in the outer peripheral annular groove of the cover,
The first plate and the second plate are alternately stacked inside the fluid filling chamber,
The spline teeth on the outer periphery of the first plate are fitted in the spline grooves provided on the inner periphery of the housing body, and the spline teeth on the inner periphery of the second plate are fitted in the spline grooves provided on the outer periphery of the inner shaft.
In the viscous fluid coupling that transmits power between the housing body and the inner shaft by the viscous fluid filled in the fluid filling chamber,
A viscous fluid coupling, wherein a cutout is provided in a part of the outer periphery of the cover, and an O-ring receiving a pressure of a certain level or more in the fluid filling chamber protrudes from the outer annular groove into the cutout. 前記カバーがハウジング本体の嵌合用穴に係止する止め輪により固定化されるとともに、該カバーに設けた粘性流体の注入孔にシール用ボルトを封着してなるとき、該カバーにおけるシール用ボルトを通る概ね半径線上に前記切除部を設け、シール用ボルトの頭部を挟む両側に止め輪の両端部を配置してなる請求項１に記載の粘性流体カップリング。   When the cover is fixed by a retaining ring that engages with a fitting hole in the housing body, and a sealing bolt is sealed in a viscous fluid injection hole provided in the cover, the sealing bolt in the cover 2. The viscous fluid coupling according to claim 1, wherein the cut portion is provided substantially on a radial line passing through the first end, and both end portions of the retaining ring are disposed on both sides sandwiching the head portion of the sealing bolt.
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