JP2878628B2 - Valve stem seal - Google Patents
Valve stem sealInfo
- Publication number
- JP2878628B2 JP2878628B2 JP7222138A JP22213895A JP2878628B2 JP 2878628 B2 JP2878628 B2 JP 2878628B2 JP 7222138 A JP7222138 A JP 7222138A JP 22213895 A JP22213895 A JP 22213895A JP 2878628 B2 JP2878628 B2 JP 2878628B2
- Authority
- JP
- Japan
- Prior art keywords
- valve stem
- graphite particles
- seal
- weight
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Compositions Of Macromolecular Compounds (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Material Composition (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として内燃機関
の吸・排気弁等に用いられるバルブステムシールに関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve stem seal mainly used for intake and exhaust valves of an internal combustion engine.
【０００２】[0002]
【従来の技術と発明が解決しようとする課題】一般に、
内燃機関の吸・排気弁には、図１に示すようなバルブス
テムシール装置が装着されている。このバルブステムシ
ール装置においては、エンジンのシリンダヘッド１に円
筒状のバルブステムガイド２が固着されており、このバ
ルブステムガイド２にバルブ３が燃焼室側端部に一体的
に形成されているバルブステム４が摺動自在に遊嵌され
ており、更に前記バルブステムガイド２の反燃焼室側端
部にバルブステムシール５の基端部を嵌合固定し、この
バルブステムシール５のシールリップ部６をバルブステ
ム４の外周に接触させ、エンジンオイルを掻き取ってバ
ルブステム４の周面に所望厚さの油膜を形成し、バルブ
ステムガイド２とバルブステム４との焼き付きを防止す
るように構成されている。2. Description of the Related Art In general,
A valve stem sealing device as shown in FIG. 1 is mounted on an intake / exhaust valve of an internal combustion engine. In this valve stem seal device, a cylindrical valve stem guide 2 is fixed to a cylinder head 1 of an engine, and a valve 3 is formed integrally with the valve stem guide 2 at an end portion on the combustion chamber side. A stem 4 is slidably and loosely fitted, and a base end of a valve stem seal 5 is fitted and fixed to an end of the valve stem guide 2 on the side opposite to the combustion chamber. 6 is brought into contact with the outer periphery of the valve stem 4 to scrape engine oil to form an oil film of a desired thickness on the peripheral surface of the valve stem 4 so as to prevent seizure between the valve stem guide 2 and the valve stem 4. Have been.
【０００３】このバルブステムシール５は、図２に示す
ように、金属製の断面略Ｌ字形の補強環７のフランジ部
７ａの内周部にシールリップ部６が形成されており、そ
のシールリップ部６の内周面にフッ素樹脂膜８が一体に
形成されている。そして、このバルブステムシール５の
シールリップ部６からのエンジンオイルの漏れ量、即ち
バルブステム４の周面に形成される油膜厚の調節は、バ
ルブステムシール５のシールリップ部６の形状設定によ
り行なわれている。即ち、図２に示すように、油面角α
とシール角βとの角度の関係と、シールリップ部６のリ
ップ先端部のラウンド（Ｒ）の大小によって調節され
る。As shown in FIG. 2, the valve stem seal 5 has a seal lip 6 formed on the inner periphery of a flange 7a of a reinforcing ring 7 made of metal and having a substantially L-shaped cross section. A fluororesin film 8 is integrally formed on the inner peripheral surface of the portion 6. The amount of engine oil leaking from the seal lip 6 of the valve stem seal 5, that is, the adjustment of the oil film thickness formed on the peripheral surface of the valve stem 4 is controlled by setting the shape of the seal lip 6 of the valve stem seal 5. Is being done. That is, as shown in FIG.
And the seal angle β, and the roundness (R) of the lip tip of the seal lip 6 is adjusted.
【０００４】前述したようにバルブステムシール５のシ
ールリップ部６からのエンジンオイルの漏れ量によりバ
ルブステム４とバルブステムガイド２との潤滑を行って
いるため、潤滑を保ち、かつエンジンオイルの消費量を
少なくするためには、バルブステムシール５のシールリ
ップ部６からの漏れ量を厳格に調整しなければならず、
これをバルブステムシール５のシールリップ部６の形状
設定で行うことは、必ずしも容易なことではない。As described above, since the valve stem 4 and the valve stem guide 2 are lubricated by the amount of engine oil leaking from the seal lip portion 6 of the valve stem seal 5, lubrication is maintained and engine oil is consumed. In order to reduce the amount, the amount of leakage from the seal lip 6 of the valve stem seal 5 must be strictly adjusted.
It is not always easy to perform this by setting the shape of the seal lip 6 of the valve stem seal 5.
【０００５】また、エンジンオイルの漏れ量の過少は、
バルブステム４とバルブステムガイド２との摩耗を促進
させ、その結果として異音を発生させたり、潤滑不足に
よる焼き付き等の現象を発生させるばかりでなく、周辺
のシリンダヘッドの温度を上昇させるという問題があっ
た。また、逆にエンジンオイルの漏れ量の過多は、当然
エンジンオイルの消費量を増加させるとともに、エンジ
ンオイルの燃焼による白煙を発生させるという問題があ
った。[0005] In addition, if the amount of engine oil leakage is too small,
The problem is that the wear of the valve stem 4 and the valve stem guide 2 is promoted, and as a result, not only noises are generated, phenomena such as seizure due to insufficient lubrication, but also the temperature of the surrounding cylinder head is increased. was there. Conversely, an excessive amount of leakage of engine oil naturally causes an increase in consumption of engine oil and a problem of generating white smoke due to combustion of the engine oil.
【０００６】しかしながら従来技術においては、所望の
エンジンオイル漏れ量下限値に適合するバルブステムシ
ールを得るためには、前記の油面角αとシール角βとの
角度関係とバルブステムシールのリップ先端部のラウン
ド（Ｒ）の大小との兼ね合いによるシールリップ部の形
状面で対処せざるを得なかった。However, in the prior art, in order to obtain a valve stem seal conforming to a desired lower limit of engine oil leakage, an angle relationship between the oil surface angle α and the seal angle β and a lip tip of the valve stem seal are required. The shape of the seal lip portion has to be dealt with due to the size of the round (R) of the portion.
【０００７】また、図３のように、実線に示す漏れ量分
布（下限値Ｌａ、上限値Ｕａ）のエンジンオイルの漏れ
量の下限値ＬａをＬｂまで増加させると、増加されたエ
ンジンオイルの漏れ量は同図破線に示す漏れ量分布（下
限値Ｌｂ、上限値Ｕｂ）のようになり、下限値Ｌｂ以上
に上限値Ｕｂが増加し、即ち増加前の漏れ量の分布幅
（Ｕａ−Ｌａ）より増加後の分布幅（Ｕｂ−Ｌｂ）が大
きくなり、つまりオイル漏れ量のバラツキ幅が大きくな
ってしまうという問題があった。As shown in FIG. 3, when the lower limit value La of the engine oil leakage amount in the leakage amount distribution (lower limit value La, upper limit value Ua) shown by the solid line is increased to Lb, the increased engine oil leakage amount increases. The amount is like a leakage amount distribution (lower limit value Lb, upper limit value Ub) indicated by a broken line in the same figure, and the upper limit value Ub increases above the lower limit value Lb, that is, the distribution width of the leak amount before the increase (Ua-La). There is a problem that the distribution width (Ub-Lb) after the increase becomes larger, that is, the variation width of the oil leakage amount becomes larger.
【０００８】また、実公平６−１４００２号公報におい
て、「リップの先端部に多数の硬質粒体を埋設したこと
を特徴とするバルブステム用シール」が提案されている
が、この従来例においては配合物がガラスの小球からな
る硬質粒体であるため、使用中においてバルブステムを
摩耗させたり、硬質粒体が欠落した場合には当該硬質粒
体がバルブステムガイドとバルブステムとの間に噛み込
み、バルブステムガイドおよびバルブステムをも著しく
摩耗させてしまう欠点を有していた。Japanese Utility Model Publication No. Hei 6-14002 proposes a "seal for a valve stem characterized by embedding a large number of hard particles at the tip of a lip". Since the compound is a hard granule consisting of glass spheres, when the valve stem is worn during use or when the hard granule is missing, the hard granule is placed between the valve stem guide and the valve stem. This has the disadvantage that the bite and the valve stem guide and the valve stem are also significantly worn.
【０００９】本発明はこれらの点に鑑みてなされたもの
であり、バルブステムシールのシールリップ部からのエ
ンジンオイル漏れ量下限値の設定が容易であり、かつ漏
れ量の上限値を小さく抑え、結果的に漏れ量のバラツキ
幅が小さく、耐久性にも優れているバルブステムシール
を提供することを目的とする。The present invention has been made in view of these points, and it is easy to set the lower limit of the engine oil leakage from the seal lip of the valve stem seal, and to keep the upper limit of the leakage small. As a result, an object of the present invention is to provide a valve stem seal having a small variation width of the leakage amount and excellent durability.
【００１０】[0010]
【課題を解決するための手段】前記目的を達成するため
に、本発明のバルブステムシールは、シールリップ部の
内周の摺動面にフッ素樹脂膜を有するバルブステムシー
ルにおいて、前記フッ素樹脂膜を、フッ素樹脂１００重
量部に対して平均粒径が２０〜１００μｍの軟質粒体で
ある黒鉛粒子を３〜３０重量部を含有させて形成した
り、更に耐摩耗性材料を含有させて形成して、良好なシ
ール性を発揮させるようにしている。In order to achieve the above object, a valve stem seal according to the present invention is a valve stem seal having a fluorine resin film on a sliding surface on the inner periphery of a seal lip. Is formed by containing 3 to 30 parts by weight of graphite particles which are soft particles having an average particle diameter of 20 to 100 μm with respect to 100 parts by weight of a fluororesin, or by further containing a wear-resistant material. Thus, good sealing properties are exhibited.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。Embodiments of the present invention will be described below.
【００１２】本発明者等は、前記目的を達成するために
鋭意研究し、シールリップ部の内周の摺動面にフッ素樹
脂膜を有するバルブステムシールにおいて、前記フッ素
樹脂膜をフッ素樹脂に軟質粒体である黒鉛粒子を含有さ
せた複合材とし、その黒鉛粒子の大きさを平均粒径が２
０〜１００μｍの範囲とし、かつ、含有量をフッ素樹脂
１００重量部に対して黒鉛粒子を３〜３０重量部の範囲
とすることによって、バルブステムシールのシールリッ
プ部の形状に依存することなく、所望のエンジンオイル
の漏れ量下限値を設定することができ、かつ漏れ量のバ
ラツキ幅の小さいバルブステムシールが得られることを
見いだした。The present inventors have conducted intensive studies to achieve the above object, and in a valve stem seal having a fluororesin film on a sliding surface on the inner periphery of a seal lip, the fluororesin film is made of a soft resin. The composite material contains graphite particles as granules, and the graphite particles have an average particle size of 2
By setting the graphite particles in the range of 0 to 100 μm and the content of the graphite particles in the range of 3 to 30 parts by weight with respect to 100 parts by weight of the fluororesin, without depending on the shape of the seal lip portion of the valve stem seal, It has been found that a desired lower limit of engine oil leakage can be set, and a valve stem seal with a small variation in leakage can be obtained.
【００１３】また、本発明者等は、前記のフッ素樹脂に
軟質粒体である黒鉛粒子を含有させた複合材からなるフ
ッ素樹脂膜に、更にガラス繊維微粉末等からなる耐摩耗
性材料を含有させることにより、シールリップ部の摩耗
を長期間に亘って小さく抑えて、良好なシール性を長期
間保持することができることを見いだした。Further, the present inventors have disclosed that a fluororesin film made of a composite material in which graphite particles as soft particles are added to the fluororesin described above further contains an abrasion-resistant material made of glass fiber fine powder or the like. By doing so, it has been found that abrasion of the seal lip portion can be kept small over a long period of time, and good sealing properties can be maintained for a long period of time.
【００１４】更に説明すると、フッ素樹脂膜に含有させ
る黒鉛粒子の大きさが小さく含有量が少ない場合は、フ
ッ素樹脂膜の表面状態が密となり、バルブステムシール
とバルブステムとの摺接部の油膜の厚さが薄くなって、
エンジンオイルの漏れ量は少なくなる。一方、黒鉛粒子
の大きさを大きく含有量を増やしてゆくと、フッ素樹脂
膜の表面状態が粗くなり、バルブステムシールとバルブ
ステムとの摺接部の油膜の厚さが厚くなり、エンジンオ
イルの漏れ量の多いバルブステムシールが得られる。ま
た、フッ素樹脂膜に含有させられている配合物が軟質粒
体であるので、使用中においてバルブステムを摩耗させ
たり、配合物が欠落した場合においても、バルブステム
ガイドとバルブステムとの間を摩耗させることはない。More specifically, when the size of the graphite particles contained in the fluororesin film is small and the content is small, the surface state of the fluororesin film becomes dense, and the oil film at the sliding contact portion between the valve stem seal and the valve stem is formed. Has become thinner,
The amount of engine oil leakage is reduced. On the other hand, as the size of the graphite particles is increased, the surface condition of the fluororesin film becomes rougher, the oil film at the sliding contact portion between the valve stem seal and the valve stem becomes thicker, and the engine oil A valve stem seal with a large amount of leakage can be obtained. In addition, since the compound contained in the fluororesin film is a soft particle, the valve stem may be worn during use or even if the compound is missing, the gap between the valve stem guide and the valve stem may be lost. It does not wear.
【００１５】本発明において、フッ素樹脂に含有させる
黒鉛粒子の大きさおよびフッ素樹脂１００重量部に対す
る含有量は、平均粒径が２０〜１００μｍのものを３〜
３０重量部、好ましくは平均粒径が２０〜７５μｍのも
のを３〜２０重量部、さらに好ましくは平均粒径２０〜
５０μｍのものを５〜２０重量部とするとよい。In the present invention, the size of the graphite particles to be contained in the fluororesin and the content with respect to 100 parts by weight of the fluororesin are as follows.
30 parts by weight, preferably 3 to 20 parts by weight having an average particle diameter of 20 to 75 μm, more preferably 20 to 75 parts by weight
The thickness of 50 μm is preferably 5 to 20 parts by weight.
【００１６】この場合、含有させる黒鉛粒子の平均粒径
が２０μｍ未満で、含有量が３重量部未満であると、黒
鉛粒子の効果が薄く、好ましくない。また、黒鉛粒子の
平均粒径が１００μｍを越え、含有量が３０重量部を越
えると、実際に内燃機関に使用した際に、不具合の生じ
る領域に達するため、好ましくない。In this case, if the average particle size of the graphite particles to be contained is less than 20 μm and the content is less than 3 parts by weight, the effect of the graphite particles is unpreferably small. On the other hand, if the average particle size of the graphite particles exceeds 100 μm and the content exceeds 30 parts by weight, a problematic area will be reached when the graphite particles are actually used in an internal combustion engine.
【００１７】本発明に適用されるフッ素樹脂としては、
ＰＴＦＥを用いることが好ましいが、他のフッ素樹脂と
してはＦＥＰ、ＰＦＡ等が挙げられる。例えば、前記Ｐ
ＴＦＥとしては、三井デュポンフロロケミカル株式会社
製のテフロン７Ｊやダイキン工業株式会社製のポリフロ
ンＭ−１２等を用いることができる。The fluororesin applied to the present invention includes:
It is preferable to use PTFE, but other fluorine resins include FEP, PFA and the like. For example, the P
As TFE, Teflon 7J manufactured by Mitsui Dupont Fluorochemical Co., Ltd., Polyflon M-12 manufactured by Daikin Industries, Ltd., or the like can be used.
【００１８】本発明に適用される黒鉛粒子としては、特
に限定されるものではないが、株式会社中越黒鉛工業所
製のＧ−３、Ｇ−１５０、Ｇ−１００や、日本黒鉛工業
株式会社製のＨＡＧ−５、ＰＡＧ−５や、オリエンタル
産業株式会社製のＡＴ−Ｎｏ５、ＡＴ−Ｎｏ７や、富士
黒鉛工業株式会社製のＦＧＫ−３、ＦＧＫ−１５０、Ｆ
ＧＫ−１００等を用いることができる。The graphite particles applicable to the present invention are not particularly limited, but include G-3, G-150 and G-100 manufactured by Chuetsu Graphite Industry Co., Ltd., and Nippon Graphite Industry Co., Ltd. HAG-5 and PAG-5, AT-No5 and AT-No7 manufactured by Oriental Sangyo Co., Ltd., and FGK-3, FGK-150, F
GK-100 or the like can be used.
【００１９】本発明に適用される耐摩耗性材料として
は、特に限定されるものではないが、ガラス繊維微粉
末、カーボン繊維微粉末等を用いることができる。例え
ば、前記ガラス繊維微粉末としては、日本板硝子株式会
社製のマイクログラスサーフェストランド、マイクログ
ラスミルドファイバー等を用いることができる。The wear-resistant material applied to the present invention is not particularly limited, but glass fiber fine powder, carbon fiber fine powder and the like can be used. For example, as the glass fiber fine powder, micro glass surface strand, micro glass milled fiber, etc. manufactured by Nippon Sheet Glass Co., Ltd. can be used.
【００２０】[0020]
【実施例】次に、以下の説明および表−１、２に示す本
発明の実施例１〜１０と比較例１〜６とを比較して説明
する。Next, Examples 1 to 10 of the present invention and Comparative Examples 1 to 6 shown in the following description and Tables 1 and 2 will be compared and described.
【００２１】実施例１ フッ素樹脂として三井デュポンフロロケミカル株式会社
製のテフロン７ＪからなるＰＴＦＥを１００重量部にガ
ラス繊維微粉末を１０重量部、平均粒径２０μｍの黒鉛
粒子を５重量部を含有させたフッ素樹脂膜をもってバル
ブステムシールを製した。Example 1 As a fluororesin, 100 parts by weight of PTFE made of Teflon 7J manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd., 10 parts by weight of glass fiber fine powder, and 5 parts by weight of graphite particles having an average particle diameter of 20 μm were added. A valve stem seal was manufactured using the fluororesin film.
【００２２】実施例２ 実施例１の素材中、黒鉛粒子を５０μｍに変更した。Example 2 In the material of Example 1, the graphite particles were changed to 50 μm.
【００２３】実施例３ 実施例１の素材中、黒鉛粒子を７５μｍに変更した。Example 3 In the material of Example 1, the graphite particles were changed to 75 μm.
【００２４】実施例４ 実施例１の素材中、黒鉛粒子を１００μｍに変更した。Example 4 In the raw material of Example 1, the graphite particles were changed to 100 μm.
【００２５】実施例５ 実施例１の素材中、黒鉛粒子を平均粒径：５０μｍ、含
有量：３重量部に変更した。Example 5 In the material of Example 1, the graphite particles were changed to an average particle diameter of 50 μm and a content of 3 parts by weight.
【００２６】実施例６ 実施例５の素材中、黒鉛粒子を１０重量部に変更した。Example 6 In the material of Example 5, the amount of graphite particles was changed to 10 parts by weight.
【００２７】実施例７ 実施例５の素材中、黒鉛粒子を２０重量部に変更した。Example 7 In the material of Example 5, the amount of graphite particles was changed to 20 parts by weight.
【００２８】実施例８ 実施例５の素材中、黒鉛粒子を３０重量部に変更した。Example 8 In the material of Example 5, the amount of graphite particles was changed to 30 parts by weight.
【００２９】実施例９ 実施例１の素材中、黒鉛粒子の含有量を３０重量部に変
更した。Example 9 In the material of Example 1, the content of graphite particles was changed to 30 parts by weight.
【００３０】実施例１０ 実施例４の素材中、黒鉛粒子の含有量を３０重量部に変
更した。Example 10 In the material of Example 4, the content of graphite particles was changed to 30 parts by weight.
【００３１】比較例１ 実施例１の素材中、黒鉛粒子を６μｍに変更した。Comparative Example 1 In the material of Example 1, the graphite particles were changed to 6 μm.
【００３２】比較例２ 実施例１の素材中、黒鉛粒子を２００μｍに変更した。Comparative Example 2 In the material of Example 1, the graphite particles were changed to 200 μm.
【００３３】比較例３ 実施例１の素材中、黒鉛粒子の含有量を４０重量部に変
更した。Comparative Example 3 In the material of Example 1, the content of graphite particles was changed to 40 parts by weight.
【００３４】比較例４ 実施例１の素材中、黒鉛粒子を含有させなかった。Comparative Example 4 The raw material of Example 1 did not contain graphite particles.
【００３５】比較例５ 実施例２の素材中、黒鉛粒子の含有量を４０重量部に変
更した。Comparative Example 5 In the material of Example 2, the content of the graphite particles was changed to 40 parts by weight.
【００３６】比較例６ 実施例４の素材中、黒鉛粒子の含有量を４０重量部に変
更した。Comparative Example 6 In the material of Example 4, the content of graphite particles was changed to 40 parts by weight.
【００３７】前記各実施例および比較例のフッ素樹脂膜
の物性即ち引張強さ（ＭＰａ）および伸び（％）並びに
初期オイルリーク量下限値（Ａ：極小、Ｂ：小、Ｃ：
中、Ｄ：大、Ｅ：多大、実用範囲はＢ〜Ｄ）を表−１お
よび表−２に示してある。実行した初期オイルリーク量
下限値の試験条件は、温度：１２０℃、ストローク：１
０ｍｍ、スピード：１５００ｃｐｍ、試験時間：１０時
間、潤滑：エンジンオイル、軸粗さ：Ｒｚ３．２μｍで
ある。The physical properties, ie, tensile strength (MPa) and elongation (%), and lower limit of the initial oil leak amount (A: extremely small, B: small, C:
Medium, D: large, E: large, practical range is B to D) are shown in Table-1 and Table-2. The test conditions of the executed initial oil leak lower limit value were as follows: temperature: 120 ° C., stroke: 1
0 mm, speed: 1500 cpm, test time: 10 hours, lubrication: engine oil, shaft roughness: Rz 3.2 μm.
【００３８】 結果 表−１および表−２に示すように、実施例１〜１０よ
り、フッ素樹脂膜をフッ素樹脂に軟質粒体である黒鉛粒
子を含有させた複合材とし、その黒鉛粒子の大きさを平
均粒径が２０〜１００μｍの範囲で、かつ、含有量をフ
ッ素樹脂１００重量部に対して黒鉛粒子を３〜３０重量
部の範囲とすることによって、エンジンオイルの初期オ
イルリーク量下限値が実用に耐え得るＢ〜Ｄの評価を得
ることができることがわかった。一方、比較例１〜６よ
り、黒鉛粒子の大きさおよび含有量が前記範囲以外であ
る場合には、エンジンオイルの初期オイルリーク量下限
値が実用に耐え得ないＡ、Ｅの評価となることがわかっ
た。[0038] Results As shown in Tables 1 and 2, from Examples 1 to 10, the fluororesin film was used as a composite material containing graphite particles as soft particles in the fluororesin, and the size of the graphite particles was averaged. By setting the particle size in the range of 20 to 100 μm and the content of the graphite particles in the range of 3 to 30 parts by weight with respect to 100 parts by weight of the fluororesin, the lower limit of the initial oil leak amount of the engine oil becomes practical. It was found that it was possible to obtain a rating of B to D that could endure. On the other hand, from Comparative Examples 1 to 6, when the size and the content of the graphite particles are out of the above ranges, the lower limit of the initial oil leak amount of the engine oil is evaluated as A or E, which cannot withstand practical use. I understood.
【００３９】実施例１１ 実施例９と同様に形成されている。Embodiment 11 The same as Embodiment 9 is formed.
【００４０】実施例１２ 実施例１０と同様に形成されている。Embodiment 12 The structure is the same as that of Embodiment 10.
【００４１】比較例７ 実施例９の素材中、ガラス繊維微粉末を含有させなかっ
た。Comparative Example 7 The raw material of Example 9 did not contain glass fiber fine powder.
【００４２】比較例８ 実施例１０の素材中、ガラス繊維微粉末を含有させなか
った。Comparative Example 8 The raw material of Example 10 did not contain glass fiber fine powder.
【００４３】前記各実施例および比較例のフッ素樹脂膜
の物性即ち引張強さ（ＭＰａ）および伸び（％）、初期
オイルリーク量下限値（Ａ：極小、Ｂ：小、Ｃ：中、
Ｄ：大、Ｅ：多大、実用範囲はＢ〜Ｄ）並びにベンチ耐
久終了時オイルリーク量下限値（Ａ：極小、Ｂ：小、
Ｃ：中、Ｄ：大、Ｅ：多大、実用範囲はＢ〜Ｄ）を表−
３に示してある。実行したベンチ耐久試験条件は、温
度：１２０℃、ストローク：１０ｍｍ、スピード：１５
００ｃｐｍ、試験時間：５００時間、潤滑：エンジンオ
イル、軸粗さ：Ｒｚ３．２μｍである。The properties of the fluororesin films of the above Examples and Comparative Examples, ie, tensile strength (MPa) and elongation (%), lower limit of initial oil leak amount (A: extremely small, B: small, C: medium,
D: large, E: large, practical range is B to D) and the lower limit of oil leak amount at the end of bench durability (A: extremely small, B: small,
C: medium, D: large, E: large, practical range is B to D)
It is shown in FIG. The bench durability test conditions were as follows: temperature: 120 ° C., stroke: 10 mm, speed: 15
00 cpm, test time: 500 hours, lubrication: engine oil, shaft roughness: Rz 3.2 μm.
【００４４】 結果 表−３に示すように、実施例１１、１２および比較例
７、８より、本発明に従って黒鉛粒子を含有させると、
エンジンオイルの初期オイルリーク量下限値は実用に耐
え得る評価Ｄを得ることができ、更に、ガラス繊維微粉
末を含有させた本発明のフッ素樹脂膜を用いたバルブス
テムシール（実施例１１、１２）はベンチ耐久試験が終
了しても、そのシール性は劣化せず、エンジンオイルの
オイルリーク量下限値が実用に耐え得るＤの評価を得る
ことができることがわかった。[0044] Results As shown in Table 3, from Examples 11, 12 and Comparative Examples 7, 8, when graphite particles were contained according to the present invention,
For the lower limit of the initial oil leak amount of the engine oil, a rating D that can withstand practical use can be obtained, and further, a valve stem seal using the fluororesin membrane of the present invention containing glass fiber fine powder (Examples 11 and 12) In the case of), even when the bench durability test was completed, the sealing property was not deteriorated, and it was found that the lower limit of the oil leak amount of the engine oil could be evaluated as D which can be practically used.
【００４５】なお、本発明は前記実施の形態および実施
例に限定されるものではなく、必要に応じて変更するこ
とができる。It should be noted that the present invention is not limited to the above-described embodiments and examples, and can be modified as needed.
【００４６】[0046]
【発明の効果】このように本発明のバルブステムシール
は構成され作用するものであるから、バルブステムシー
ルのシールリップ部からのエンジンオイル漏れ量下限値
の設定が容易であり、かつ漏れ量の上限値を小さく抑
え、結果的に漏れ量のバラツキ幅が小さくなり、耐久性
にも優れたものとなる等の効果を奏する。As described above, since the valve stem seal of the present invention is constructed and operates, it is easy to set the lower limit value of the engine oil leakage from the seal lip of the valve stem seal, and to reduce the leakage amount. The upper limit is suppressed to a small value, and as a result, the variation width of the leakage amount is reduced, and effects such as excellent durability are exhibited.
【図１】バルブステムシール部を示す内燃機関の縦断側
面図FIG. 1 is a longitudinal sectional side view of an internal combustion engine showing a valve stem seal portion.
【図２】バルブステムシールを示す拡大断面図FIG. 2 is an enlarged sectional view showing a valve stem seal.
【図３】バルブステムシールのオイルリーク量の分布を
示す特性図FIG. 3 is a characteristic diagram showing a distribution of an oil leak amount of a valve stem seal.
２ バルブステムガイド ３ バルブ ４ バルブステム ５ バルブステムシール ６ シールリップ部 ８ フッ素樹脂膜 2 Valve stem guide 3 Valve 4 Valve stem 5 Valve stem seal 6 Seal lip 8 Fluororesin film
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ１６Ｊ 15/32 ３０１ Ｆ１６Ｊ 15/32 ３０１Ｇ (72)発明者 長野 朗一 東京都葛飾区堀切３丁目30番１号 株式 会社荒井製作所内 (56)参考文献 特開 平７−188485（ＪＰ，Ａ) 特開 平５−239440（ＪＰ，Ａ) 特開 昭60−233144（ＪＰ，Ａ) 特開 平２−76723（ＪＰ，Ａ) 実開 平４−104111（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F01L 3/08 C08K 3/04 C08L 27/12 C09K 3/10 F16J 15/32 301 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI F16J 15/32 301 F16J 15/32 301G (72) Inventor Nagaichi Koichi 3-30-1 Horikiri, Katsushika-ku, Tokyo Arai Co., Ltd. (56) References JP-A-7-188485 (JP, A) JP-A-5-239440 (JP, A) JP-A-60-233144 (JP, A) JP-A-2-76723 (JP, A) ) Hikaru 4-104111 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) F01L 3/08 C08K 3/04 C08L 27/12 C09K 3/10 F16J 15/32 301
Claims (2)
樹脂膜を有するバルブステムシールにおいて、前記フッ
素樹脂膜はフッ素樹脂１００重量部に対して平均粒径が
２０〜１００μｍの軟質粒体である黒鉛粒子を３〜３０
重量部含有していることを特徴とするバルブステムシー
ル。1. A valve stem seal having a fluororesin film on a sliding surface on an inner periphery of a seal lip portion, wherein said fluororesin film is a soft particle having an average particle diameter of 20 to 100 μm with respect to 100 parts by weight of the fluororesin. 3 to 30 graphite particles
A valve stem seal characterized by containing parts by weight.
樹脂膜を有するバルブステムシールにおいて、前記フッ
素樹脂膜はフッ素樹脂１００重量部に対して平均粒径が
２０〜１００μｍの軟質粒体である黒鉛粒子を３〜３０
重量部含有しているとともに、耐摩耗性材料を含有して
いることを特徴とするバルブステムシール。2. A valve stem seal having a fluorine resin film on a sliding surface on an inner periphery of a seal lip portion, wherein the fluorine resin film has a soft particle having an average particle diameter of 20 to 100 μm with respect to 100 parts by weight of the fluorine resin. 3 to 30 graphite particles
A valve stem seal comprising a weight part and a wear-resistant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7222138A JP2878628B2 (en) | 1995-08-30 | 1995-08-30 | Valve stem seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7222138A JP2878628B2 (en) | 1995-08-30 | 1995-08-30 | Valve stem seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0968011A JPH0968011A (en) | 1997-03-11 |
| JP2878628B2 true JP2878628B2 (en) | 1999-04-05 |
Family
ID=16777776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7222138A Expired - Lifetime JP2878628B2 (en) | 1995-08-30 | 1995-08-30 | Valve stem seal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2878628B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002364756A (en) * | 2001-06-08 | 2002-12-18 | Nok Corp | Sealing device |
| JP2003014135A (en) * | 2001-06-29 | 2003-01-15 | Nok Corp | Sealing device |
| EP1895208B1 (en) | 2005-06-21 | 2012-07-04 | NOK Corporation | Oil seal and process for producing the same |
| JP2009058051A (en) * | 2007-08-31 | 2009-03-19 | Nok Corp | Sealing device for reciprocating shaft |
| US8931452B2 (en) | 2010-03-08 | 2015-01-13 | Honda Motor Co., Ltd. | Vehicle valve stem seal |
| WO2013111643A1 (en) | 2012-01-23 | 2013-08-01 | ダイキン工業株式会社 | Oil seal for automobile |
| EP3628896B1 (en) | 2015-12-08 | 2022-06-22 | NOK Corporation | Valve stem seal |
-
1995
- 1995-08-30 JP JP7222138A patent/JP2878628B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0968011A (en) | 1997-03-11 |
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