JP2008196535A - Friction plate of multiplate wet clutch - Google Patents

Friction plate of multiplate wet clutch Download PDF

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JP2008196535A
JP2008196535A JP2007029947A JP2007029947A JP2008196535A JP 2008196535 A JP2008196535 A JP 2008196535A JP 2007029947 A JP2007029947 A JP 2007029947A JP 2007029947 A JP2007029947 A JP 2007029947A JP 2008196535 A JP2008196535 A JP 2008196535A
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oil groove
oil
shows
friction
friction plate
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JP4574632B2 (en
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Masahiro Kobayashi
昌弘 小林
Hiroyuki Kanehara
博之 金原
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NSK Warner KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a friction plate of a multiplate wet clutch keeping drag torque in idling small, and preventing biting in an initial stage of engagement. <P>SOLUTION: In Figure, 40 shows the friction plate, 41 shows a core plate, 42 shows a segment piece of a friction material, 43 shows a spline tooth, 51 shows a first oil groove opened to an inside diameter side, 52 shows an end thereof, 61 shows a second oil groove opened to an outside diameter side, and 62 shows an end thereof, respectively. In an example shown in the Figure, a protrusion 71 is provided on a side 63 of the second oil groove 61 on a side surface side, and the opening of the second oil groove is narrowed. Thus, the fluid resistance is generated in the oil passing through the narrowed opening when the oil in the second oil groove is delivered to the outside diameter side in the initial stage of clutch engagement, which has an effect of a cushion, and biting is prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は自動変速機のクラッチやブレーキに使用される湿式多板クラッチのフリクションプレートに関する。   The present invention relates to a friction plate of a wet multi-plate clutch used for a clutch and a brake of an automatic transmission.

図１は湿式多板クラッチの基本的な構成を示す断面図であって、図において、１０は湿式多板クラッチ、２１はクラッチケース、２２は動力を伝達する相手側のハブ、２３はクラッチケースのスプライン溝、２４はハブのスプライン溝、２５はセパレータプレート３０とフリクションプレート４０をバッキングプレート２６に押圧するピストン、２７はバッキングプレートを支持するスナップリング、２８はピストンの封止リングをそれぞれ表している。   FIG. 1 is a sectional view showing a basic configuration of a wet multi-plate clutch. In the figure, 10 is a wet multi-plate clutch, 21 is a clutch case, 22 is a counterpart hub for transmitting power, and 23 is a clutch case. , 24 is a hub spline groove, 25 is a piston that presses the separator plate 30 and the friction plate 40 against the backing plate 26, 27 is a snap ring that supports the backing plate, and 28 is a sealing ring of the piston. Yes.

近年、自動車の低燃費の要求はますます増大しており、自動変速機においても、クラッチの空転時におけるフリクションプレートとセパレータプレートとの間の引き摺りトルクの低減が一層求められている。   In recent years, demands for low fuel consumption of automobiles are increasing, and even in automatic transmissions, there is a further demand for reducing drag torque between the friction plate and the separator plate when the clutch is idling.

従来空転時の引き摺りトルクの低減のため、フリクションプレートとセパレータプレートを引き離すように、端面の閉じた油溝と、クラッチ係合時における摩擦面への潤滑油の供給による焼き付き防止のための油供給用の内外径方向に貫通した油通路とがフリクションプレートに設けられている。   Conventionally, to reduce drag torque during idling, an oil groove with a closed end face to separate the friction plate and separator plate, and oil supply to prevent seizure by supplying lubricating oil to the friction surface when the clutch is engaged An oil passage penetrating in the inner and outer diameter direction is provided in the friction plate.

しかし最近燃費向上と同時に、動力性能向上をねらいとしての変速応答性向上のため、フリクションプレートとセパレータプレートの間のクリアランスは従来に比較して一層小さくなっており、空転時において介在する油膜による引き摺りトルクもますます大きくなる傾向にある。   Recently, however, the clearance between the friction plate and the separator plate has become even smaller than before in order to improve the speed change responsiveness aimed at improving the power performance as well as improving the fuel efficiency. The torque also tends to increase.

従来のフリクションプレートでは、摩擦面における油の排出が十分になされないことにより、引き摺りトルクをより低減させるという要求に満足に応えられず、特に低域の回転時においては、フリクションプレートとセパレータプレートとの間に介在する油の排出が十分でなく、引き摺りトルクを小さくすることができなかった。   In the conventional friction plate, the oil is not sufficiently discharged on the friction surface, so that the demand for further reducing the drag torque cannot be satisfactorily satisfied. The oil interposed between them was not sufficiently discharged, and the drag torque could not be reduced.

内径側から供給される油は摩擦面に引き込まれ、引き込まれた油はフリクションプレートとセパレータプレートの間に入ると、なかなか排出されず、特にフリクションプレートとセパレータプレート間のクリアランスの小さな、回転数の小さな領域では顕著であり、摩擦材と相手側セパレータプレート間の粘性による引き摺りトルクは大きなものとなる。   The oil supplied from the inner diameter side is drawn into the friction surface, and when the drawn oil enters between the friction plate and the separator plate, it is not easily discharged. Especially, the clearance between the friction plate and the separator plate is small and the rotational speed is small. This is remarkable in a small region, and the drag torque due to the viscosity between the friction material and the mating separator plate becomes large.

このため摩擦材面に外径側に開口する油溝（以下第２の油溝と称する。）を設けると、油通路から摩擦面に引き込まれた油がスムースに外径側に排出され、空転時において引き摺りトルクの低減が可能になる。特に低回転時では、その効果は大きい。また引き込まれた油がスムースに排除されるため、係合時に生ずる摩擦熱も油と一緒にスムースに排除され摩擦材の耐熱性が向上する。   For this reason, if an oil groove (hereinafter referred to as a second oil groove) that opens to the outer diameter side is provided on the friction material surface, the oil drawn into the friction surface from the oil passage is smoothly discharged to the outer diameter side, causing the idle rotation. At the time, drag torque can be reduced. The effect is particularly great at low speeds. Further, since the drawn-in oil is smoothly removed, friction heat generated during engagement is also smoothly removed together with the oil, and the heat resistance of the friction material is improved.

また内径側に開口して端部が閉じている油溝（以下第１の油溝と称する。）は、フリクションプレートとセパレータプレートのクリアランスを均一にする効果と、クラッチが解除されるときスムースに引き離し、空転時の引き摺りトルク低減の効果などがある。   Also, the oil groove that is open to the inner diameter side and closed at the end (hereinafter referred to as the first oil groove) has an effect of making the clearance between the friction plate and the separator plate uniform and smoothly when the clutch is released. There is an effect of reducing drag torque at the time of separation and idling.

そしてこれらの油溝を持った摩擦材のセグメントピースを円周方向に間隔を持って接着することによりセグメントピース間に内外径に連通する油通路が形成され、これにより供給される余分の潤滑油は油通路から排除され、空転時の引き摺りトルクの低減には大きな効果がある。   Then, by adhering the segment pieces of the friction material having these oil grooves at intervals in the circumferential direction, an oil passage communicating with the inner and outer diameters is formed between the segment pieces, and excess lubricating oil supplied thereby Is removed from the oil passage and has a great effect on reducing drag torque during idling.

しかし係合初期において、摩擦面に存在する油がこれらの油溝や油通路により急激に摩擦面から排除されるため油のクッション効果が低減され、係合初期においてクラッチの食い付きが発生する。
特開平１１−１４１５７０号公報 特開２００５−７６７５９号公報 However, at the initial stage of engagement, the oil existing on the friction surface is suddenly removed from the friction surface by these oil grooves and oil passages, so that the oil cushioning effect is reduced, and the clutch bite occurs at the initial stage of engagement.
JP-A-11-141570 JP-A-2005-76759

前述の如く従来の装置では、クラッチの係合初期に、油が急激に摩擦面から排除されるので、油のクッション効果が低減され、食い付きが発生する。自動変速機のクラッチまたはブレーキに使用された場合は変速ショックを生ずるという不具合を免れない。   As described above, in the conventional apparatus, oil is suddenly removed from the friction surface at the initial stage of engagement of the clutch, so that the cushioning effect of oil is reduced and biting occurs. When used in a clutch or brake of an automatic transmission, there is an inevitable problem that a shift shock occurs.

この発明は前記の課題を解決するために、「フリクションプレートの内径側に開口し、摩擦材の途中に端部を有する第１の油溝と、外径側に開口し、摩擦材の途中に端部を有する第２の油溝とを持った摩擦材のセグメントピースが円周方向に間隔を持って接着されている湿式多板クラッチのフリクションプレートにおいて、第２の油溝は開口部から端部に向かってその幅が狭くなる形状を有し、その開口部において、溝幅を狭くしてあることを特徴とするフリクションプレート。」を得たものである。   In order to solve the above-mentioned problem, the present invention provides: “a first oil groove that opens to the inner diameter side of the friction plate and has an end portion in the middle of the friction material, and an outer diameter side that opens to the middle of the friction material. In a friction plate of a wet multi-plate clutch in which friction material segment pieces each having a second oil groove having an end portion are bonded to each other at intervals in the circumferential direction, the second oil groove extends from the opening to the end. The friction plate is characterized in that the width thereof becomes narrower toward the portion, and the groove width is narrowed in the opening. "

この発明のフリクションプレートをクラッチに使用することにより、空転時の引き摺りトルクを低減するとともに、係合初期の食い付きを防止し、変速機に使用した場合の変速ショックを避けることができるものである。   By using the friction plate of the present invention for a clutch, drag torque during idling can be reduced, biting at the initial stage of engagement can be prevented, and shift shock when used in a transmission can be avoided. .

外径側に開口している第２の油溝は、外径側に向かい幅が大きくなる形状にすれば、油排除性は増加する。内径側に開口している第１の油溝は開口部から端部に向かって幅を狭くすると、相対するプレートを引き離す効果が増大する。   If the second oil groove that opens to the outer diameter side has a shape that increases in width toward the outer diameter side, the oil eliminability increases. When the width of the first oil groove that opens to the inner diameter side is narrowed from the opening toward the end, the effect of separating the opposing plates increases.

油溝や油通路については、摩擦面積や、摩擦特性、供給油量などに合わせ種々の形状が考えられる。   Regarding the oil groove and the oil passage, various shapes can be considered according to the friction area, the friction characteristics, the amount of supplied oil, and the like.

図２はこの発明の第１実施例の正面図、図３は図２の要部拡大図であって、４０はフリクションプレート、４１はコアプレート、４２は摩擦材のセグメントピース、４３はハブと嵌合するスプライン歯、５１は内径側に開口する第１の油溝（以下第１の油溝と称する。）、５２はその端部、６１は外径側に開口する第２の油溝（以下第２の油溝と称する。）、６２はその端部をそれぞれ表している。   2 is a front view of the first embodiment of the present invention, FIG. 3 is an enlarged view of the main part of FIG. 2, 40 is a friction plate, 41 is a core plate, 42 is a segment piece of friction material, 43 is a hub The spline teeth to be fitted, 51 is a first oil groove (hereinafter referred to as a first oil groove) that opens to the inner diameter side, 52 is an end thereof, and 61 is a second oil groove that opens to the outer diameter side ( Hereinafter, it is referred to as a second oil groove.) 62 represents an end portion thereof.

第１の油溝５１、第２の油溝６１ともその端部５２、６２から開口側に向かって幅が大きくなっている。また端部５２、６２はともに摩擦材の径方向の中央部を越えているところに位置している。。   The widths of the first oil groove 51 and the second oil groove 61 are increased from the end portions 52 and 62 toward the opening side. Further, the end portions 52 and 62 are both located beyond the central portion in the radial direction of the friction material. .

この発明では第２の油溝の開口部の幅を狭くすることにより、クラッチ係合時に、第２の油溝にある油が外径側に排出される際、開口部が狭くなっているので、開口部を通過する油に流体抵抗が生じ、これがクッション効果を生じ初期の食い付きが防止されるものである。   In this invention, by narrowing the width of the opening of the second oil groove, when the oil in the second oil groove is discharged to the outer diameter side when the clutch is engaged, the opening is narrowed. A fluid resistance is generated in the oil passing through the opening, which provides a cushioning effect and prevents initial biting.

図２、図３に示す例では、セグメントピース４２が、第１、第２の油溝５１、６１によってアルファベットのＷの形をしているとき、両側の第２の油溝６１の外側の辺６３に開口部において凸部７１が形成されていて、開口部を狭めている。   In the example shown in FIGS. 2 and 3, when the segment piece 42 is in the shape of the letter W by the first and second oil grooves 51, 61, the outer sides of the second oil grooves 61 on both sides A convex portion 71 is formed in the opening portion 63 to narrow the opening portion.

図４に示す別な実施例では、セグメントピース４２が同様にＷの形をしているとき、第２の油溝６１の図３の場合とは反対側の中央の方の辺６４に開口部において凸部７１が設けられている。凸部７１は第２の油溝６１の開口部の両側の辺に設けてもよいが、一方の側にのみ設けた方が空転時の油排出の効果を損なうことなく、引き摺りトルクを小さくでき、また係合時にはクッション効果も有効に出すことができ、係合初期の食い付きを防止するフリクションプレートとすることが可能である。   In another embodiment shown in FIG. 4, when the segment piece 42 is also in the shape of a W, an opening is formed in the side 64 of the second oil groove 61 on the opposite side to the center of FIG. The convex part 71 is provided. The convex portions 71 may be provided on both sides of the opening of the second oil groove 61. However, if the convex portions 71 are provided only on one side, the drag torque can be reduced without impairing the oil discharge effect during idling. In addition, a cushioning effect can be effectively obtained during engagement, and a friction plate that prevents biting in the initial stage of engagement can be obtained.

第２の油溝６１はその開口部が凸部７１により狭められているので、クラッチ係合時に第２の油溝にある油が外径側に排出される際に、狭められている開口部を通過する油に流体抵抗が生じ、これがクッション効果を奏し係合初期の食い付きが防止される。   Since the opening of the second oil groove 61 is narrowed by the convex portion 71, the opening that is narrowed when the oil in the second oil groove is discharged to the outer diameter side when the clutch is engaged. Fluid resistance is generated in the oil passing through the cylinder, and this has a cushioning effect and prevents biting in the initial stage of engagement.

図５はこの発明の効果を表す線図であって、たて軸にトルクＴ、よこ軸に時間ｔをとっている。破線Ｂは従来の装置の場合を示し係合初期に食い付きが生じている。実線Ａはこの発明の場合であって、トルクが平均に分布していることを表している。   FIG. 5 is a diagram showing the effect of the present invention, wherein the vertical axis is torque T and the horizontal axis is time t. A broken line B shows a case of a conventional device, and bite occurs at the initial stage of engagement. A solid line A is the case of the present invention and represents that the torque is distributed on the average.

この発明によって、多くの潤滑油が供給される潤滑環境においても、空転時の引き摺りトルクを小さく保ちながら、係合初期の食い付きが防止できる湿式多板クラッチを得ることができた。   According to the present invention, it is possible to obtain a wet multi-plate clutch capable of preventing biting at the initial stage of engagement while maintaining a low drag torque during idling even in a lubricating environment where a large amount of lubricating oil is supplied.

湿式多板クラッチの基本構成を示す断面図Sectional view showing the basic structure of the wet multi-plate clutch この発明の実施例を示す正面図Front view showing an embodiment of the present invention 図２の要部拡大図2 is an enlarged view of the main part of FIG. 別な実施例の図３と同様な図Figure similar to Figure 3 of another embodiment この発明の効果を示す線図Diagram showing the effect of the present invention

符号の説明Explanation of symbols

１０ 湿式多板クラッチ
２１ クラッチケース
２２ ハブ
２３ クラッチケースのスプライン溝
２４ ハブのスプライン溝
２５ ピストン
２６ バッキングプレート
２７ スナップリング
２８ 封止リング
３０ セパレータプレート
４０ フリクションプレート
４１ コアプレート
４２ セグメントピース
４３ スプライン歯
５１ 第１の油溝
５２ 端部
６１ 第２の油溝
６２ 端部
６３ 外側の辺
６４ 中央の辺
７１ 凸部 10 Wet Multi-plate Clutch 21 Clutch Case 22 Hub 23 Clutch Case Spline Groove 24 Hub Spline Groove 25 Piston 26 Backing Plate 27 Snap Ring 28 Seal Ring 30 Separator Plate 40 Friction Plate 41 Core Plate 42 Segment Piece 43 Spline Teeth 51 First 1 oil groove 52 end 61 second oil groove 62 end 63 outer side 64 central side 71 convex

Claims (3)

フリクションプレートの内径側に開口し、摩擦材の途中に端部を有する第１の油溝（以下第１の油溝と称する。）と、外径側に開口し、摩擦材の途中に端部を有する第２の油溝（以下第２の油溝と称する。）とを持った摩擦材のセグメントピースが円周方向に間隔を持って接着されている湿式多板クラッチのフリクションプレートにおいて、
第２の油溝は開口部から端部に向かってその幅が狭くなる形状を有し、その開口部において、溝幅を狭くしてあることを特徴とする湿式多板クラッチのフリクションプレート。 A first oil groove (hereinafter referred to as a first oil groove) that opens to the inner diameter side of the friction plate and has an end portion in the middle of the friction material, and an end portion that opens to the outer diameter side and ends in the middle of the friction material In a friction plate of a wet multi-plate clutch in which segment pieces of a friction material having a second oil groove (hereinafter referred to as a second oil groove) having
The friction plate of the wet multi-plate clutch, wherein the second oil groove has a shape in which the width is narrowed from the opening portion toward the end portion, and the groove width is narrowed in the opening portion. 前記第２の油溝の開口部の一方の面に凸部が形成されていて、開口部の溝幅を狭くしていることを特徴とする請求項１記載のフリクションプレート。   2. The friction plate according to claim 1, wherein a convex portion is formed on one surface of the opening of the second oil groove to narrow the groove width of the opening. 第１の油溝及び第２の油溝の端部は、摩擦材の径方向の中央部を越えて位置していることを特徴とする請求項１記載のフリクションプレート。   2. The friction plate according to claim 1, wherein end portions of the first oil groove and the second oil groove are located beyond a central portion in a radial direction of the friction material.
JP2007029947A 2007-02-09 2007-02-09 Wet multi-plate clutch friction plate Expired - Fee Related JP4574632B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2007029947A JP4574632B2 (en) 2007-02-09 2007-02-09 Wet multi-plate clutch friction plate
US11/964,187 US7823714B2 (en) 2007-02-09 2007-12-26 Friction plate for wet-type multiplate clutch

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JP2007029947A JP4574632B2 (en) 2007-02-09 2007-02-09 Wet multi-plate clutch friction plate

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JP2008196535A true JP2008196535A (en) 2008-08-28
JP4574632B2 JP4574632B2 (en) 2010-11-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110873157A (en) * 2018-08-31 2020-03-10 丰田自动车株式会社 Automatic transmission

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11141570A (en) * 1997-11-11 1999-05-25 Nsk Warner Kk Friction plate
JP2005036980A (en) * 2003-07-14 2005-02-10 Borgwarner Inc Friction material having slot for locally supplying oil
JP2007132362A (en) * 2005-11-08 2007-05-31 Nsk Warner Kk Friction plate and wet multi-disk clutch with friction plate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11141570A (en) * 1997-11-11 1999-05-25 Nsk Warner Kk Friction plate
JP2005036980A (en) * 2003-07-14 2005-02-10 Borgwarner Inc Friction material having slot for locally supplying oil
JP2007132362A (en) * 2005-11-08 2007-05-31 Nsk Warner Kk Friction plate and wet multi-disk clutch with friction plate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110873157A (en) * 2018-08-31 2020-03-10 丰田自动车株式会社 Automatic transmission
CN110873157B (en) * 2018-08-31 2022-11-15 丰田自动车株式会社 Automatic transmission

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