JP2004150449A - Segment type friction material - Google Patents

Segment type friction material Download PDF

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Publication number
JP2004150449A
JP2004150449A JP2002312870A JP2002312870A JP2004150449A JP 2004150449 A JP2004150449 A JP 2004150449A JP 2002312870 A JP2002312870 A JP 2002312870A JP 2002312870 A JP2002312870 A JP 2002312870A JP 2004150449 A JP2004150449 A JP 2004150449A
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Japan
Prior art keywords
segment
friction material
outer peripheral
type friction
peripheral opening
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JP2002312870A
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Japanese (ja)
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JP4004922B2 (en
Inventor
Masato Suzuki
雅登 鈴木
Yoshito Fujimaki
義人 藤巻
Masayuki Mizuno
雅之 水野
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Aisin Chemical Co Ltd
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Aisin Chemical Co Ltd
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Priority to JP2002312870A priority Critical patent/JP4004922B2/en
Priority to US10/644,067 priority patent/US7165664B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To remarkably improve the separation resistance of a segment piece by inhibiting the oil pressure generated on an outer peripheral part. <P>SOLUTION: Three kinds of segment type friction materials 1 are prepared by changing a ratio of an outer peripheral opening part a and an inner peripheral opening part b by changing round shape 5 sizes of an outer peripheral corner and an inner peripheral corner. For example, a first one has a ratio a/b=2.1, a second one has a ratio a/b=1.6, and a third one has a ratio a/b=1.0. As a result of the test of separation resistance, the separation is soon found, that is, only ten cycles in the duration test, on the friction material of a/b=1.0. On the contrary, the separation resistance is remarkably improved, that is, 500 duration cycles, on the segment type friction material having the outer peripheral opening part a larger than the inner peripheral opening part b by 1.6 times. Further the separation resistance is further improved, that is, 2,500 duration cycles, on the segment type friction material having the outer peripheral opening part a larger than the inner peripheral opening part b by 2.1 times. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、油中に浸した状態で対向面に高圧力をかけることによってトルクを得る湿式摩擦材であって、平板リング状の芯金にセグメントピースに切断した摩擦材基材を全周両面に接着してなるセグメントタイプ摩擦材に関するものである。
【0002】
【従来の技術】
【特許文献1】特開平4−194422号公報
【特許文献2】米国特許第5094331号公報
近年、湿式摩擦材として、材料の歩留まり向上による低コスト化、引き摺りトルク低減による車両での低燃費化を目指して、図5に示されるような平板リング状の芯金22に平板リング形状に沿ったセグメントピースに切断した摩擦材基材23を油溝24となる間隔をおいて接着剤で順次並べて全周に亘って接着し、裏面にも同様にセグメントピースに切断した摩擦材基材23を接着してなるセグメントタイプ摩擦材21が開発されている。図5は従来のセグメントタイプ摩擦材の全体構成を示す平面図である。このようなセグメントタイプ摩擦材21は、自動車等の自動変速機やオートバイ等の変速機に用いられる複数または単数の摩擦板を設けた摩擦材係合装置用として用いることができる。
【0003】
【発明が解決しようとする課題】
しかしながら、このセグメントタイプ摩擦材21は、油溝部分24がセグメントピース23の切断面から成り立っているため、現在主流のプレス成形溝品と比較して、空転時にATFによる負荷(剪断トルク等)を受けた際、溝壁部の耐剥離性に劣ることが問題となっている。
【0004】
そこで、本発明は、セグメントタイプ摩擦材の油溝部分の外周部に発生する油圧を抑制することによって耐剥離性を大きく向上させたセグメントタイプ摩擦材を提供することを課題とするものである。
【0005】
【課題を解決するための手段】
請求項1の発明にかかるセグメントタイプ摩擦材は、平板リング形状の芯金に前記平板リング形状に沿ったセグメントピースに切断した摩擦材基材を全周両面に接着してなるセグメントタイプ摩擦材であって、油溝となる隣り合うセグメントピースとの間隙の外周開口部の幅を内周開口部の幅よりも大きくしたものである。
【0006】
このように、外周開口部の幅を内周開口部の幅よりも大きくすることによって、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0007】
このようにして、外周部に発生する油圧を抑制することによって、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0008】
請求項2の発明にかかるセグメントタイプ摩擦材は、請求項1の構成において、前記油溝となる隣り合うセグメントピースとの間隙の前記外周開口部の幅を前記内周開口部の幅の約1.5倍以上としたものである。
【0009】
外周開口部の幅を内周開口部の幅よりも大きくしても、セグメントピースの形状等によっては、外周部に発生する油圧抑制の効果が余り表れないことがある。そこで、本発明者らが鋭意実験を繰り返した結果、外周開口部の幅を内周開口部の幅の約1.5倍以上にまで大きくすることによって、外周部に発生する油圧抑制の効果が顕著に表れ、セグメントピースが飛躍的に剥がれにくくなることを見出した。
【0010】
このようにして、確実に外周部に発生する油圧を抑制することによって、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0011】
請求項3の発明にかかるセグメントタイプ摩擦材は、請求項1または請求項2の構成において、前記油溝となる隣り合うセグメントピースとの間隙の前記外周開口部の幅を前記内周開口部の幅の約2.0倍から約3.0倍としたものである。
【0012】
これによって、さらに外周部に発生する油圧が抑制され、セグメントピースがより剥がれにくくなる。余りセグメントピースの面積を減らすと摩擦面積が減って不都合が出てくるが、外周開口部の幅を内周開口部の幅の約2.0倍から約3.0倍とする程度であれば最も適切に外周部に発生する油圧を抑制することができる。
【0013】
このようにして、より確実に外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0014】
請求項4の発明にかかるセグメントタイプ摩擦材は、請求項1乃至請求項3のいずれか1つの構成において、前記セグメントピースの4箇所のコーナーにRを付けたものである。
【0015】
これによって、セグメントピースの外周部の2箇所のコーナーにより大きなRを付ければ、外周開口部の幅を内周開口部の幅よりも大きくすることができ、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0016】
このようにして、外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0017】
請求項5の発明にかかるセグメントタイプ摩擦材は、請求項1乃至請求項3のいずれか1つの構成において、前記セグメントピースの4箇所のコーナーを面取りしたものである。
【0018】
これによって、セグメントピースの外周部の2箇所のコーナーをより大きく面取りすれば、外周開口部の幅を内周開口部の幅よりも大きくすることができ、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0019】
このようにして、外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0020】
請求項6の発明にかかるセグメントタイプ摩擦材は、請求項1乃至請求項3のいずれか1つの構成において、前記油溝となる隣り合うセグメントピースとの間隙を略V字形としたものである。
【0021】
これによって、外周開口部を略V字形の間隙の拡がった方とすれば、外周開口部の幅を内周開口部の幅よりも大きくすることができ、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0022】
このようにして、外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0023】
【発明の実施の形態】
以下、本発明の実施の形態について、図1乃至図4を参照して説明する。図1は本発明の実施の形態にかかるセグメントタイプ摩擦材のうち、セグメントピースの4箇所のコーナーにRを付けた実施例1を示す部分拡大平面図である。図2は本発明の実施の形態にかかるセグメントタイプ摩擦材のうち、セグメントピースの4箇所のコーナーを面取りした実施例2を示す部分拡大平面図である。図3は本発明の実施の形態にかかるセグメントタイプ摩擦材のうち、隣り合うセグメントピースとの間隙を略V字形とした実施例3を示す部分拡大平面図である。図4は本発明の実施の形態にかかるセグメントタイプ摩擦材の耐剥離性試験を行った際の試験パターンを示す図である。
【0024】
まず、本実施の形態のセグメントタイプ摩擦材のうち、実施例1について図1を参照して説明する。
【0025】
図1に示されるように、実施例1のセグメントタイプ摩擦材1は、平板リング形状の芯金2にセグメントピース3を接着剤(熱硬化性樹脂)を使用して油溝分の間隔4を空けて並べて貼り付け、芯金2の裏面にも同様に接着剤で貼り付けている。ここで、セグメントピース3の4箇所のコーナーはR形状5となっている。そして、両面から230℃〜250℃の熱プレスで30秒〜90秒加圧して芯金2にセグメントピース3を固着させ、完成品(セグメントタイプ摩擦材1)を得た。
【0026】
このようなセグメントタイプ摩擦材1を、外周コーナーのR形状5と内周コーナーのR形状5の大きさを変えることによって、外周開口部aと内周開口部bの比を変えて3種類製造した。1つ目は外周コーナーのR形状5をR=3とし、内周コーナーのR形状5をR=1とすることによって、外周開口部aと内周開口部bの比a/b=2.1とした。2つ目は外周コーナーのR形状5をR=2とし、内周コーナーのR形状5をR=1として、外周開口部aと内周開口部bの比a/b=1.6とした。3つ目は比較例として外周コーナーのR形状5も内周コーナーのR形状5もともにR=1として、比a/b=1.0としたものを製造した。
【0027】
本実施例1の3種類のセグメントタイプ摩擦材1の耐剥離性については、後程他の実施例とともに纏めて述べる。
【0028】
次に、本実施の形態のセグメントタイプ摩擦材のうち、実施例2について図2を参照して説明する。
【0029】
図2に示されるように、実施例2のセグメントタイプ摩擦材6は、平板リング形状の芯金2にセグメントピース7を接着剤(熱硬化性樹脂)を使用して油溝分の間隔8を空けて並べて貼り付け、芯金2の裏面にも同様に接着剤で貼り付けている。ここで、セグメントピース7の4箇所のコーナーは面取り9が施されている。そして、両面から230℃〜250℃の熱プレスで30秒〜90秒加圧して芯金2にセグメントピース7を固着させ、完成品(セグメントタイプ摩擦材6)を得た。
【0030】
このようなセグメントタイプ摩擦材6を、外周コーナーの面取り9と内周コーナーの面取り9の大きさを変えることによって、外周開口部aと内周開口部bの比を変えて3種類製造した。1つ目は外周コーナーの面取り9の大きさをC=3とし、内周コーナーの面取り9の大きさをC=1とすることによって、外周開口部aと内周開口部bの比a/b=2.1とした。2つ目は外周コーナーの面取り9の大きさをC=2とし、内周コーナーの面取り9の大きさをC=1として、外周開口部aと内周開口部bの比a/b=1.6とした。3つ目は比較例として外周コーナーの面取り9の大きさも内周コーナーの面取り9の大きさもともにC=1として、比a/b=1.0としたものを製造した。
【0031】
次に、本実施の形態のセグメントタイプ摩擦材のうち、実施例3について図3を参照して説明する。
【0032】
図3に示されるように、実施例3のセグメントタイプ摩擦材11は、平板リング形状の芯金2にセグメントピース12を接着剤(熱硬化性樹脂)を使用して油溝分の間隔13を空けて並べて貼り付け、芯金2の裏面にも同様に接着剤で貼り付けている。ここで、隣り合うセグメントピース12の間隙は略V字形となっている。そして、両面から230℃〜250℃の熱プレスで30秒〜90秒加圧して芯金2にセグメントピース7を固着させ、完成品(セグメントタイプ摩擦材11)を得た。
【0033】
このようなセグメントタイプ摩擦材11を、略V字形の油溝13の角度を変えることによって、外周開口部aと内周開口部bの比を変えて3種類製造した。1つ目は外周部溝幅a=6とし、内周部溝幅b=2とすることによって、外周開口部aと内周開口部bの比a/b=3.0とした。2つ目は外周部溝幅a=4とし、内周部溝幅b=2とすることによって、外周開口部aと内周開口部bの比a/b=2.0とした。3つ目は外周部溝幅a=2.5とし、内周部溝幅b=2とすることによって、外周開口部aと内周開口部bの比a/b≒1.3としたものを製造した。
【0034】
次に、これらの実施例1〜実施例3までの9種類のセグメントタイプ摩擦材についての耐剥離性試験の内容と結果について、図4を参照して説明する。
【0035】
テスターとしてはSAE#2テスター20を用い、4枚のプレートの間に供試体となるセグメントタイプ摩擦材を3枚組み込んだ。潤滑油としてATF(油温120℃)をATF油量=1000ml(フルディップ)の状態で、相対回転数5000rpmとして、図4に示されるように、4枚のプレートと3枚のセグメントタイプ摩擦材を押しつけた状態(ON)とクリアランスをとった状態(OFF)の比が、1サイクル当りON/OFF=20sec/40secの条件で行い、セグメントピースの剥離が起こるまでの耐久サイクル数を測定した。各実施例についての結果を、[表1]、[表2]、[表3]に示す。
【0036】
【表1】

Figure 2004150449
【0037】
【表2】
Figure 2004150449
【0038】
【表3】
Figure 2004150449
【0039】
[表1]、[表2]に示されるように、セグメントピース3の4箇所のコーナーにRを付けた実施例1とセグメントピース7の4箇所のコーナーに面取りを施した実施例2においては、比較例として製造した外周開口部aと内周開口部bの大きさが同じ(a/b=1.0の)セグメントタイプ摩擦材は、耐久サイクルが僅か10サイクルですぐに剥離してしまう。
【0040】
これに対して、外周開口部aの大きさが内周開口部bの1.6倍のセグメントタイプ摩擦材は、実施例1,2ともに耐久サイクルが500サイクルと耐剥離性が飛躍的に向上している。さらに、外周開口部aの大きさが内周開口部bの2.1倍のセグメントタイプ摩擦材は、実施例1,2ともに耐久サイクルが2500サイクルと耐剥離性がより向上している。
【0041】
一方、[表3]に示されるように、隣り合うセグメントピース12の間隙が略V字形の実施例3においては、外周開口部aの大きさが内周開口部bの約1.3倍のセグメントタイプ摩擦材は、耐久サイクルが僅か10サイクルで耐剥離性が向上していない。このように、セグメントピースの形状やそれに伴う油溝の形状の如何によっては、外周開口部aの大きさが内周開口部bよりも大きくても耐剥離性が向上しない場合もある。(なお、実験データがないので不詳であるが、実施例3のセグメントタイプ摩擦材においても、a/b=1.6即ち1.5倍以上とすれば、耐剥離性が向上する可能性もある。)
【0042】
しかし、外周開口部aの大きさが内周開口部bの2.0倍のセグメントタイプ摩擦材は、耐久サイクルが2500サイクルと耐剥離性が飛躍的に向上している。また、外周開口部aの大きさが内周開口部bの3.0倍のセグメントタイプ摩擦材は、耐久サイクルが5000サイクルとさらに耐剥離性が向上している。
【0043】
したがって、[表1]、[表2]、[表3]に示される結果を見る限り、外周開口部aの大きさを内周開口部bの大きさの約2.0倍〜約3.0倍の範囲内とすることが、耐剥離性を向上させるためには最も好ましいと考えられる。
【0044】
本実施の形態においては、セグメントタイプ摩擦材を自動車の自動変速機に用いる場合を想定して説明したが、セグメントタイプ摩擦材は他にもオートバイ等の変速機に用いられる複数または単数の摩擦板を設けた摩擦材係合装置用として用いることができる。したがって、用途に応じてセグメントタイプ摩擦材の全体及び各部の寸法は変化する。
【0045】
セグメントタイプ摩擦材のその他の部分の構成、形状、数量、材質、大きさ、接続関係等についても、本実施の形態に限定されるものではない。
【0046】
【発明の効果】
以上説明したように、請求項1の発明にかかるセグメントタイプ摩擦材は、平板リング形状の芯金に前記平板リング形状に沿ったセグメントピースに切断した摩擦材基材を全周両面に接着してなるセグメントタイプ摩擦材であって、油溝となる隣り合うセグメントピースとの間隙の外周開口部の幅を内周開口部の幅よりも大きくしたものである。
【0047】
このように、外周開口部の幅を内周開口部の幅よりも大きくすることによって、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0048】
このようにして、外周部に発生する油圧を抑制することによって、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0049】
請求項2の発明にかかるセグメントタイプ摩擦材は、請求項1の構成において、前記油溝となる隣り合うセグメントピースとの間隙の前記外周開口部の幅を前記内周開口部の幅の約1.5倍以上としたものである。
【0050】
外周開口部の幅を内周開口部の幅よりも大きくしても、セグメントピースの形状等によっては、外周部に発生する油圧抑制の効果が余り表れないことがある。そこで、本発明者らが鋭意実験を繰り返した結果、外周開口部の幅を内周開口部の幅の約1.5倍以上にまで大きくすることによって、外周部に発生する油圧抑制の効果が顕著に表れ、セグメントピースが飛躍的に剥がれにくくなることを見出した。
【0051】
このようにして、確実に外周部に発生する油圧を抑制することによって、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0052】
請求項3の発明にかかるセグメントタイプ摩擦材は、請求項1または請求項2の構成において、前記油溝となる隣り合うセグメントピースとの間隙の前記外周開口部の幅を前記内周開口部の幅の約2.0倍から約3.0倍としたものである。
【0053】
これによって、さらに外周部に発生する油圧が抑制され、セグメントピースがより剥がれにくくなる。余りセグメントピースの面積を減らすと摩擦面積が減って不都合が出てくるが、外周開口部の幅を内周開口部の幅の約2.0倍から約3.0倍とする程度であれば最も適切に外周部に発生する油圧を抑制することができる。
【0054】
このようにして、より確実に外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0055】
請求項4の発明にかかるセグメントタイプ摩擦材は、請求項1乃至請求項3のいずれか1つの構成において、前記セグメントピースの4箇所のコーナーにRを付けたものである。
【0056】
これによって、セグメントピースの外周部の2箇所のコーナーにより大きなRを付ければ、外周開口部の幅を内周開口部の幅よりも大きくすることができ、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0057】
このようにして、外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0058】
請求項5の発明にかかるセグメントタイプ摩擦材は、請求項1乃至請求項3のいずれか1つの構成において、前記セグメントピースの4箇所のコーナーを面取りしたものである。
【0059】
これによって、セグメントピースの外周部の2箇所のコーナーをより大きく面取りすれば、外周開口部の幅を内周開口部の幅よりも大きくすることができ、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0060】
このようにして、外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【0061】
請求項6の発明にかかるセグメントタイプ摩擦材は、請求項1乃至請求項3のいずれか1つの構成において、前記油溝となる隣り合うセグメントピースとの間隙を略V字形としたものである。
【0062】
これによって、外周開口部を略V字形の間隙の拡がった方とすれば、外周開口部の幅を内周開口部の幅よりも大きくすることができ、外周部の開口部におけるATFの流れがスムースになって、外周部に発生する油圧が抑制され、セグメントピースが飛躍的に剥がれにくくなる。
【0063】
このようにして、外周部に発生する油圧を抑制し、耐剥離性を大きく向上させたセグメントタイプ摩擦材となる。
【図面の簡単な説明】
【図1】図1は本発明の実施の形態にかかるセグメントタイプ摩擦材のうち、セグメントピースの4箇所のコーナーにRを付けた実施例1を示す部分拡大平面図である。
【図2】図2は本発明の実施の形態にかかるセグメントタイプ摩擦材のうち、セグメントピースの4箇所のコーナーを面取りした実施例2を示す部分拡大平面図である。
【図3】図3は本発明の実施の形態にかかるセグメントタイプ摩擦材のうち、隣り合うセグメントピースとの間隙を略V字形とした実施例3を示す部分拡大平面図である。
【図4】図4は本発明の実施の形態にかかるセグメントタイプ摩擦材の耐剥離性試験を行った際の試験パターンを示す図である。
【図5】図5は従来のセグメントタイプ摩擦材の全体構成を示す平面図である。
【符号の説明】
1,6,11 セグメントタイプ摩擦材
2 芯金
3,7,12 セグメントピース
4,8,13 油溝(間隙)
5 R
9 面取り
a 外周開口部の幅
b 内周開口部の幅[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is a wet friction material that obtains torque by applying high pressure to an opposing surface in a state of being immersed in oil. The present invention relates to a segment-type friction material bonded to a friction material.
[0002]
[Prior art]
[Patent Document 1] Japanese Patent Application Laid-Open No. 4-194422 [Patent Document 2] U.S. Pat. No. 5,093,331 Recently, as a wet friction material, reduction in cost by improving the yield of materials and reduction in fuel consumption in vehicles by reducing drag torque have been proposed. Aiming at the friction material base material 23 cut into segment pieces along the flat plate ring shape on the flat ring-shaped core metal 22 as shown in FIG. A segment-type friction material 21 has been developed in which a friction material base material 23 is also adhered over the circumference and a back surface is similarly adhered to a friction material base material 23 cut into segment pieces. FIG. 5 is a plan view showing the entire configuration of a conventional segment type friction material. Such a segment type friction material 21 can be used for a friction material engagement device provided with a plurality or a single friction plate used for an automatic transmission such as an automobile or a transmission such as a motorcycle.
[0003]
[Problems to be solved by the invention]
However, in the segment type friction material 21, since the oil groove portion 24 is formed by the cut surface of the segment piece 23, the load (shear torque and the like) by the ATF during idling is smaller than that of the currently mainstream press-formed groove product. When received, the problem is that the groove wall has poor peeling resistance.
[0004]
Accordingly, it is an object of the present invention to provide a segment type friction material having greatly improved peeling resistance by suppressing a hydraulic pressure generated on an outer peripheral portion of an oil groove portion of the segment type friction material.
[0005]
[Means for Solving the Problems]
The segment type friction material according to the first aspect of the present invention is a segment type friction material in which a friction material base material cut into segment pieces along the flat plate ring shape is bonded to a flat ring-shaped core metal on both surfaces of the entire circumference. In addition, the width of the outer peripheral opening of the gap between the adjacent segment pieces serving as the oil grooves is made larger than the width of the inner peripheral opening.
[0006]
In this way, by making the width of the outer peripheral opening larger than the width of the inner peripheral opening, the flow of the ATF in the outer peripheral opening becomes smooth, and the hydraulic pressure generated in the outer peripheral part is suppressed, and the segment piece Is significantly less likely to peel off.
[0007]
Thus, by suppressing the hydraulic pressure generated on the outer peripheral portion, a segment type friction material having greatly improved peeling resistance can be obtained.
[0008]
The segment type friction material according to the second aspect of the present invention is the segment type friction material according to the first aspect, wherein the width of the outer peripheral opening of the gap between the adjacent segment pieces serving as the oil groove is set to about 1 times the width of the inner peripheral opening. .5 times or more.
[0009]
Even if the width of the outer peripheral opening is larger than the width of the inner peripheral opening, depending on the shape of the segment piece and the like, the effect of suppressing the hydraulic pressure generated on the outer peripheral part may not be sufficiently exhibited. Thus, as a result of repeated experiments by the present inventors, the effect of suppressing the hydraulic pressure generated at the outer peripheral portion is improved by increasing the width of the outer peripheral opening to about 1.5 times or more the width of the inner peripheral opening. It appeared remarkably, and it was found that the segment piece was hard to peel off dramatically.
[0010]
In this way, a segment-type friction material having greatly improved peeling resistance is obtained by reliably suppressing the hydraulic pressure generated in the outer peripheral portion.
[0011]
According to a third aspect of the present invention, in the structure of the first or second aspect, the width of the outer peripheral opening of the gap between the adjacent segment pieces serving as the oil groove is set to the width of the inner peripheral opening. The width is from about 2.0 times to about 3.0 times the width.
[0012]
As a result, the hydraulic pressure generated on the outer peripheral portion is further suppressed, and the segment pieces are more difficult to peel off. If the area of the segment piece is excessively reduced, the friction area is reduced, which causes inconvenience. However, if the width of the outer peripheral opening is about 2.0 times to about 3.0 times the width of the inner peripheral opening, The hydraulic pressure generated in the outer peripheral portion can be suppressed most appropriately.
[0013]
In this manner, the segment type friction material in which the oil pressure generated in the outer peripheral portion is more reliably suppressed and the peeling resistance is greatly improved is obtained.
[0014]
A segment type friction material according to a fourth aspect of the present invention is the segment type friction material according to any one of the first to third aspects, wherein R is added to four corners of the segment piece.
[0015]
Accordingly, if a larger radius is added to the two corners of the outer peripheral portion of the segment piece, the width of the outer peripheral opening can be made larger than the width of the inner peripheral opening, and the flow of the ATF in the outer peripheral opening is reduced. As a result, the oil pressure generated in the outer peripheral portion is suppressed, and the segment pieces are hardly peeled off.
[0016]
Thus, the segment type friction material in which the hydraulic pressure generated in the outer peripheral portion is suppressed and the peel resistance is greatly improved is obtained.
[0017]
According to a fifth aspect of the present invention, there is provided the segment type friction material according to any one of the first to third aspects, wherein four corners of the segment piece are chamfered.
[0018]
Thereby, if the two corners of the outer peripheral portion of the segment piece are chamfered more, the width of the outer peripheral opening can be made larger than the width of the inner peripheral opening, and the flow of the ATF in the outer peripheral opening is reduced. As a result, the oil pressure generated in the outer peripheral portion is suppressed, and the segment pieces are hardly peeled off.
[0019]
Thus, the segment type friction material in which the hydraulic pressure generated in the outer peripheral portion is suppressed and the peel resistance is greatly improved is obtained.
[0020]
According to a sixth aspect of the present invention, there is provided a segment type friction material according to any one of the first to third aspects, wherein a gap between adjacent segment pieces serving as the oil grooves is substantially V-shaped.
[0021]
As a result, if the outer opening has a substantially V-shaped gap, the width of the outer opening can be made larger than the width of the inner opening, and the flow of ATF in the outer opening can be reduced. As a result, the oil pressure generated in the outer peripheral portion is suppressed, and the segment pieces are hardly peeled off.
[0022]
Thus, the segment type friction material in which the hydraulic pressure generated in the outer peripheral portion is suppressed and the peel resistance is greatly improved is obtained.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially enlarged plan view showing Example 1 of the segment type friction material according to the embodiment of the present invention, in which four corners of a segment piece are rounded. FIG. 2 is a partially enlarged plan view showing Example 2 of the segment type friction material according to the embodiment of the present invention in which four corners of the segment piece are chamfered. FIG. 3 is a partially enlarged plan view showing Example 3 of the segment type friction material according to the embodiment of the present invention in which the gap between adjacent segment pieces is substantially V-shaped. FIG. 4 is a view showing a test pattern when a peeling resistance test of the segment type friction material according to the embodiment of the present invention is performed.
[0024]
First, of the segment type friction material of the present embodiment, Example 1 will be described with reference to FIG.
[0025]
As shown in FIG. 1, in the segment type friction material 1 of the first embodiment, a segment piece 3 is attached to a flat ring-shaped core 2 by using an adhesive (thermosetting resin) to form an oil groove space 4. It is stuck in a row, and is also stuck to the back surface of the cored bar 2 with an adhesive. Here, four corners of the segment piece 3 have an R shape 5. Then, the segment piece 3 was fixed to the cored bar 2 by applying pressure from 230 ° C. to 250 ° C. using a hot press at 230 ° C. to 250 ° C. for 30 seconds to 90 seconds to obtain a finished product (segment type friction material 1).
[0026]
Three types of such segment type friction materials 1 are manufactured by changing the size of the R shape 5 of the outer peripheral corner and the R shape 5 of the inner peripheral corner, thereby changing the ratio of the outer peripheral opening a to the inner peripheral opening b. did. First, by setting the R shape 5 at the outer corner to R = 3 and the R shape 5 at the inner corner to R = 1, the ratio a / b of the outer opening a to the inner opening b is 2. It was set to 1. The second is that the R shape 5 at the outer corner is R = 2, the R shape 5 at the inner corner is R = 1, and the ratio a / b of the outer opening a to the inner opening b is 1.6. . Third, as a comparative example, both the R shape 5 at the outer peripheral corner and the R shape 5 at the inner peripheral corner were manufactured with R = 1 and the ratio a / b = 1.0.
[0027]
The peel resistance of the three types of segment type friction materials 1 of the first embodiment will be described later together with other examples.
[0028]
Next, of the segment type friction material of the present embodiment, Example 2 will be described with reference to FIG.
[0029]
As shown in FIG. 2, in the segment type friction material 6 of the second embodiment, the segment piece 7 is attached to the flat ring-shaped core 2 by using an adhesive (thermosetting resin) to form an oil groove interval 8. It is stuck in a row, and is also stuck to the back surface of the cored bar 2 with an adhesive. Here, four corners of the segment piece 7 are chamfered 9. Then, the segment pieces 7 were fixed to the metal core 2 by applying pressure from both sides by a hot press at 230 ° C. to 250 ° C. for 30 seconds to 90 seconds, and a finished product (segment type friction material 6) was obtained.
[0030]
Three types of such segment type friction materials 6 were manufactured by changing the size of the chamfers 9 at the outer peripheral corners and the chamfers 9 at the inner peripheral corners to change the ratio of the outer peripheral opening a to the inner peripheral opening b. First, by setting the size of the chamfer 9 at the outer peripheral corner to C = 3 and the size of the chamfer 9 at the inner peripheral corner to C = 1, the ratio a / a of the outer peripheral opening a and the inner peripheral opening b is set. b = 2.1. The second is that the size of the chamfer 9 at the outer corner is C = 2, the size of the chamfer 9 at the inner corner is C = 1, and the ratio a / b = 1 between the outer opening a and the inner opening b. .6. Third, a comparative example was manufactured in which both the size of the chamfer 9 at the outer peripheral corner and the size of the chamfer 9 at the inner peripheral corner were C = 1 and the ratio a / b = 1.0.
[0031]
Next, of the segment type friction material of the present embodiment, Example 3 will be described with reference to FIG.
[0032]
As shown in FIG. 3, in the segment type friction material 11 of the third embodiment, the segment piece 12 is attached to the flat ring-shaped core 2 by using an adhesive (thermosetting resin) to form an oil groove interval 13. It is stuck in a row, and is also stuck to the back surface of the cored bar 2 with an adhesive. Here, the gap between the adjacent segment pieces 12 is substantially V-shaped. Then, the segment piece 7 was fixed to the core metal 2 by applying pressure from 230 ° C to 250 ° C for 30 seconds to 90 seconds from both sides to obtain a finished product (segment type friction material 11).
[0033]
Three kinds of such segment type friction materials 11 were manufactured by changing the angle of the substantially V-shaped oil groove 13 to change the ratio of the outer peripheral opening a to the inner peripheral opening b. First, the ratio a / b of the outer peripheral opening a to the inner peripheral opening b was set to 3.0 by setting the outer peripheral groove width a = 6 and the inner peripheral groove width b = 2. Second, the ratio a / b of the outer peripheral opening a to the inner peripheral opening b was set to 2.0 by setting the outer peripheral groove width a = 4 and the inner peripheral groove width b = 2. Third, by setting the outer peripheral groove width a = 2.5 and the inner peripheral groove width b = 2, the ratio a / b ≒ 1.3 of the outer peripheral opening a to the inner peripheral opening b is set to 1.3. Was manufactured.
[0034]
Next, the contents and results of the peel resistance test for the nine types of segment type friction materials of Examples 1 to 3 will be described with reference to FIG.
[0035]
An SAE # 2 tester 20 was used as a tester, and three segment type friction materials serving as test samples were incorporated between four plates. As a lubricating oil, ATF (oil temperature 120 ° C.), ATF oil amount = 1000 ml (full dip), relative rotation speed 5000 rpm, as shown in FIG. 4, four plates and three segment type friction materials The ratio between the state in which the pressure was pressed (ON) and the state in which the clearance was taken (OFF) was set under the condition of ON / OFF = 20 sec / 40 sec per cycle, and the number of endurance cycles until peeling of the segment piece was measured. The results for each example are shown in [Table 1], [Table 2], and [Table 3].
[0036]
[Table 1]
Figure 2004150449
[0037]
[Table 2]
Figure 2004150449
[0038]
[Table 3]
Figure 2004150449
[0039]
As shown in [Table 1] and [Table 2], in Example 1 in which the four corners of the segment piece 3 were rounded, and in Example 2 in which the four corners of the segment piece 7 were chamfered. The segment-type friction material manufactured as a comparative example and having the same size of the outer peripheral opening a and the inner peripheral opening b (a / b = 1.0) immediately peels off in only 10 endurance cycles. .
[0040]
On the other hand, the segment-type friction material in which the size of the outer peripheral opening a is 1.6 times the size of the inner peripheral opening b is 500 cycles in both the first and second embodiments, and the peel resistance is dramatically improved. are doing. Further, the segment-type friction material in which the size of the outer peripheral opening a is 2.1 times the size of the inner peripheral opening b has a durability cycle of 2500 cycles in both Examples 1 and 2, and the peeling resistance is further improved.
[0041]
On the other hand, as shown in [Table 3], in the third embodiment in which the gap between the adjacent segment pieces 12 is substantially V-shaped, the size of the outer peripheral opening a is about 1.3 times that of the inner peripheral opening b. The segment type friction material has a durability cycle of only 10 cycles and has not improved peeling resistance. As described above, depending on the shape of the segment piece and the shape of the oil groove associated therewith, the peeling resistance may not be improved even if the size of the outer peripheral opening a is larger than the inner peripheral opening b. (Although it is unclear because there is no experimental data, the abrasion resistance of the segment type friction material of Example 3 may be improved if a / b = 1.6, that is, 1.5 times or more. is there.)
[0042]
However, the segment type friction material in which the size of the outer peripheral opening a is 2.0 times that of the inner peripheral opening b has a durability cycle of 2500 cycles, and the peeling resistance is dramatically improved. In addition, the segment type friction material in which the size of the outer peripheral opening a is 3.0 times the size of the inner peripheral opening b has a durability cycle of 5,000 cycles and further improved peeling resistance.
[0043]
Therefore, as can be seen from the results shown in [Table 1], [Table 2], and [Table 3], the size of the outer opening a is about 2.0 times to about 3.times. The size of the inner opening b. It is considered that the range of 0 times is most preferable for improving the peeling resistance.
[0044]
In the present embodiment, the description has been made on the assumption that the segment type friction material is used for an automatic transmission of an automobile, but the segment type friction material is also applicable to a plurality or a single friction plate used for a transmission such as a motorcycle. It can be used for a friction material engaging device provided with. Therefore, the dimensions of the whole and each part of the segment type friction material vary depending on the application.
[0045]
The configuration, shape, quantity, material, size, connection relationship, and the like of other portions of the segment type friction material are not limited to the present embodiment.
[0046]
【The invention's effect】
As described above, the segment type friction material according to the first aspect of the present invention is obtained by bonding a friction material base material cut into segment pieces along the flat plate ring shape to a flat ring-shaped core metal on both surfaces of the entire circumference. The width of the outer peripheral opening of the gap between the adjacent segment pieces forming the oil groove is larger than the width of the inner peripheral opening.
[0047]
In this way, by making the width of the outer peripheral opening larger than the width of the inner peripheral opening, the flow of the ATF in the outer peripheral opening becomes smooth, and the hydraulic pressure generated in the outer peripheral part is suppressed, and the segment piece Is significantly less likely to peel off.
[0048]
Thus, by suppressing the hydraulic pressure generated on the outer peripheral portion, a segment type friction material having greatly improved peeling resistance can be obtained.
[0049]
The segment type friction material according to the second aspect of the present invention is the segment type friction material according to the first aspect, wherein the width of the outer peripheral opening of the gap between the adjacent segment pieces serving as the oil groove is set to about 1 times the width of the inner peripheral opening. .5 times or more.
[0050]
Even if the width of the outer peripheral opening is larger than the width of the inner peripheral opening, depending on the shape of the segment piece and the like, the effect of suppressing the hydraulic pressure generated on the outer peripheral part may not be sufficiently exhibited. Thus, as a result of repeated experiments by the present inventors, the effect of suppressing the hydraulic pressure generated at the outer peripheral portion is improved by increasing the width of the outer peripheral opening to about 1.5 times or more the width of the inner peripheral opening. It appeared remarkably, and it was found that the segment piece was hard to peel off dramatically.
[0051]
In this way, a segment-type friction material having greatly improved peeling resistance is obtained by reliably suppressing the hydraulic pressure generated in the outer peripheral portion.
[0052]
According to a third aspect of the present invention, in the structure of the first or second aspect, the width of the outer peripheral opening of the gap between the adjacent segment pieces serving as the oil groove is set to the width of the inner peripheral opening. The width is from about 2.0 times to about 3.0 times the width.
[0053]
As a result, the hydraulic pressure generated on the outer peripheral portion is further suppressed, and the segment pieces are more difficult to peel off. If the area of the segment piece is excessively reduced, the friction area is reduced, which causes inconvenience. However, if the width of the outer peripheral opening is about 2.0 times to about 3.0 times the width of the inner peripheral opening, The hydraulic pressure generated in the outer peripheral portion can be suppressed most appropriately.
[0054]
In this manner, the segment type friction material in which the oil pressure generated in the outer peripheral portion is more reliably suppressed and the peeling resistance is greatly improved is obtained.
[0055]
A segment type friction material according to a fourth aspect of the present invention is the segment type friction material according to any one of the first to third aspects, wherein R is added to four corners of the segment piece.
[0056]
Accordingly, if a larger radius is added to the two corners of the outer peripheral portion of the segment piece, the width of the outer peripheral opening can be made larger than the width of the inner peripheral opening, and the flow of the ATF in the outer peripheral opening is reduced. As a result, the oil pressure generated in the outer peripheral portion is suppressed, and the segment pieces are hardly peeled off.
[0057]
Thus, the segment type friction material in which the hydraulic pressure generated in the outer peripheral portion is suppressed and the peel resistance is greatly improved is obtained.
[0058]
According to a fifth aspect of the present invention, there is provided the segment type friction material according to any one of the first to third aspects, wherein four corners of the segment piece are chamfered.
[0059]
Thereby, if the two corners of the outer peripheral portion of the segment piece are chamfered more, the width of the outer peripheral opening can be made larger than the width of the inner peripheral opening, and the flow of the ATF in the outer peripheral opening is reduced. As a result, the oil pressure generated in the outer peripheral portion is suppressed, and the segment pieces are hardly peeled off.
[0060]
Thus, the segment type friction material in which the hydraulic pressure generated in the outer peripheral portion is suppressed and the peel resistance is greatly improved is obtained.
[0061]
According to a sixth aspect of the present invention, there is provided the segment type friction material according to any one of the first to third aspects, wherein a gap between adjacent segment pieces serving as the oil grooves is substantially V-shaped.
[0062]
As a result, if the outer opening has a substantially V-shaped gap, the width of the outer opening can be made larger than the width of the inner opening, and the flow of ATF in the outer opening can be reduced. As a result, the oil pressure generated in the outer peripheral portion is suppressed, and the segment pieces are hardly peeled off.
[0063]
Thus, the segment type friction material in which the hydraulic pressure generated in the outer peripheral portion is suppressed and the peel resistance is greatly improved is obtained.
[Brief description of the drawings]
FIG. 1 is a partially enlarged plan view showing Example 1 of a segment-type friction material according to an embodiment of the present invention, in which R is provided at four corners of a segment piece.
FIG. 2 is a partially enlarged plan view showing Example 2 of the segment-type friction material according to the embodiment of the present invention, in which four corners of a segment piece are chamfered.
FIG. 3 is a partially enlarged plan view showing Example 3 of the segment type friction material according to the embodiment of the present invention, in which a gap between adjacent segment pieces is substantially V-shaped.
FIG. 4 is a view showing a test pattern when a peeling resistance test is performed on the segment type friction material according to the embodiment of the present invention.
FIG. 5 is a plan view showing the entire configuration of a conventional segment type friction material.
[Explanation of symbols]
1,6,11 Segment type friction material 2 Core metal 3,7,12 Segment piece 4,8,13 Oil groove (gap)
5 R
9 Chamfer a Width of outer peripheral opening b Width of inner peripheral opening

Claims (6)

平板リング形状の芯金に前記平板リング形状に沿ったセグメントピースに切断した摩擦材基材を全周両面に接着してなるセグメントタイプ摩擦材であって、
油溝となる隣り合うセグメントピースとの間隙の外周開口部の幅を内周開口部の幅よりも大きくしたことを特徴とするセグメントタイプ摩擦材。
A segment-type friction material obtained by bonding a friction material base material cut into segment pieces along the flat plate ring shape to a flat metal ring-shaped core metal on both surfaces of the entire circumference,
A segment-type friction material, wherein the width of an outer peripheral opening of a gap between adjacent segment pieces serving as oil grooves is larger than the width of an inner peripheral opening.
前記油溝となる隣り合うセグメントピースとの間隙の前記外周開口部の幅を前記内周開口部の幅の1.5倍以上としたことを特徴とする請求項1に記載のセグメントタイプ摩擦材。2. The segment type friction material according to claim 1, wherein the width of the outer peripheral opening in the gap between adjacent oil-groove segment pieces is 1.5 times or more the width of the inner peripheral opening. . 前記油溝となる隣り合うセグメントピースとの間隙の前記外周開口部の幅を前記内周開口部の幅の約2.0倍から約3.0倍としたことを特徴とする請求項1または請求項2に記載のセグメントタイプ摩擦材。The width of the outer peripheral opening of the gap between adjacent oil-groove segment pieces is about 2.0 to about 3.0 times the width of the inner peripheral opening. The segment type friction material according to claim 2. 前記セグメントピースの4箇所のコーナーにRを付けたことを特徴とする請求項1乃至請求項3のいずれか1つに記載のセグメントタイプ摩擦材。The segment type friction material according to any one of claims 1 to 3, wherein R is provided at four corners of the segment piece. 前記セグメントピースの4箇所のコーナーを面取りしたことを特徴とする請求項1乃至請求項3のいずれか1つに記載のセグメントタイプ摩擦材。The segment type friction material according to any one of claims 1 to 3, wherein four corners of the segment piece are chamfered. 前記油溝となる隣り合うセグメントピースとの間隙を略V字形としたことを特徴とする請求項1乃至請求項3のいずれか1つに記載のセグメントタイプ摩擦材。The segment type friction material according to any one of claims 1 to 3, wherein a gap between adjacent oil-groove segment pieces is substantially V-shaped.
JP2002312870A 2002-08-21 2002-10-28 Segment type friction material Expired - Fee Related JP4004922B2 (en)

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JP2008223981A (en) * 2007-03-15 2008-09-25 Nsk Warner Kk Friction plate for wet type multiple disc clutch
EP2028382A2 (en) 2007-08-20 2009-02-25 Aisin Kako Kabushiki Kaisha Wet friction material
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JP2011102645A (en) * 2007-08-20 2011-05-26 Aisin Chemical Co Ltd Wet friction material

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JP2008223981A (en) * 2007-03-15 2008-09-25 Nsk Warner Kk Friction plate for wet type multiple disc clutch
EP2028382A2 (en) 2007-08-20 2009-02-25 Aisin Kako Kabushiki Kaisha Wet friction material
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JP2011102645A (en) * 2007-08-20 2011-05-26 Aisin Chemical Co Ltd Wet friction material
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