JPH05340213A - Cam contact part structure for valve system - Google Patents
Cam contact part structure for valve systemInfo
- Publication number
- JPH05340213A JPH05340213A JP15055392A JP15055392A JPH05340213A JP H05340213 A JPH05340213 A JP H05340213A JP 15055392 A JP15055392 A JP 15055392A JP 15055392 A JP15055392 A JP 15055392A JP H05340213 A JPH05340213 A JP H05340213A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- shim
- valve
- contact portion
- cam contact
- 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.)
- Granted
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は動弁機構のカム接触部構
造に係り、特にカムと摺動するカム接触部に、耐摩耗材
の被覆を施した動弁機構のカム接触部構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam contact portion structure of a valve operating mechanism, and more particularly to a cam contact portion structure of a valve operating mechanism in which a cam contact portion sliding on a cam is coated with a wear resistant material.
【0002】[0002]
【従来の技術】内燃機関の動弁機構のカム接触部は、摺
動と衝撃が複合した極めて過酷な条件で使用されるた
め、動弁機構のカム接触部には高い耐久性が要求されて
いる。このような要求を満たすカム接触部構造として、
従来、摺動面にセラミック材からなる耐摩耗材を被覆し
たものが提案され、例えばそのセラミック材として窒化
クロム(CrN)またはCrNと金属クロム(Cr)の
混合物を用いた物が知られている(特開平3−1725
04)。2. Description of the Related Art Since the cam contact portion of a valve mechanism of an internal combustion engine is used under extremely severe conditions where sliding and impact are combined, high durability is required for the cam contact portion of the valve mechanism. There is. As a cam contact structure that meets these requirements,
Conventionally, a sliding surface coated with a wear resistant material made of a ceramic material has been proposed, and for example, a material using chromium nitride (CrN) or a mixture of CrN and metallic chromium (Cr) as the ceramic material is known ( JP-A-3-1725
04).
【0003】このカム接触部を用いた動弁機構のカム接
触部構造によれば、カム接触部は高い耐熱性及び耐摩耗
性を有し、摩耗や焼き付きといった問題に対するカム接
触部の耐久性が著しく向上する。According to the cam contact portion structure of the valve mechanism using the cam contact portion, the cam contact portion has high heat resistance and wear resistance, and the durability of the cam contact portion against problems such as wear and seizure is high. Remarkably improved.
【0004】[0004]
【発明が解決しようとする課題】しかし、内燃機関の動
弁機構においては、カムとカム接触部は高い面圧で接触
し、特にカムノーズ付近がカム接触部に接触する時に
は、それらの接触面圧が高くなり、カムとカム接触部の
間に形成される潤滑油の油膜が薄くなる。このため、カ
ム及びカム接触部の摺動面が粗いと固体接触が生じて、
カムとカム接触部が摺動する際に大きな摩擦損失が生じ
ることになる。However, in the valve operating mechanism of the internal combustion engine, the cam and the cam contact portion are in contact with each other at a high surface pressure. Becomes higher and the oil film of the lubricating oil formed between the cam and the cam contact portion becomes thinner. Therefore, if the sliding surfaces of the cam and the cam contact portion are rough, solid contact will occur,
A large friction loss occurs when the cam and the cam contact portion slide.
【0005】このため上記従来のカム接触部構造におい
て、このような摩擦損失を低減して内燃機関の燃費を向
上させるためには、カムの摺動面を高精度に表面処理す
ることが必要であった。この表面処理加工は高価な設備
と長い加工時間を要し、上記従来の動弁機構の大幅なコ
スト上昇を引き起こしている。Therefore, in the above-mentioned conventional cam contact portion structure, in order to reduce such friction loss and improve fuel efficiency of the internal combustion engine, it is necessary to surface-treat the sliding surface of the cam with high accuracy. there were. This surface treatment requires expensive equipment and a long processing time, which causes a significant increase in the cost of the conventional valve mechanism.
【0006】本発明は上述の点に鑑みてなされたもので
あり、カム接触部の摺動面の表面粗さを適正化して、そ
の研磨作用により摺動時にカムの面粗度を改善させて摩
擦損失を低減させる動弁機構のカム接触部構造を提供す
ることを目的とする。The present invention has been made in view of the above points, and optimizes the surface roughness of the sliding surface of the cam contact portion, and improves the surface roughness of the cam during sliding by its polishing action. An object of the present invention is to provide a cam contact portion structure of a valve mechanism that reduces friction loss.
【0007】[0007]
【課題を解決するための手段】上記の課題は、所定の回
転運動を行うカムと摺動して、該カムの回転運動を直線
往復運動に変換し、所定のポートを開閉弁する弁機構を
駆動する動弁機構のカム接触部の構造において、前記カ
ムと摺動するカム接触部の摺動面に、表面粗さを0.0
2μRz乃至0.7μRzとした窒化チタンの被覆層を
設けることにより解決される。The above object is to provide a valve mechanism which slides on a cam which performs a predetermined rotary motion, converts the rotary motion of the cam into a linear reciprocating motion, and opens and closes a predetermined port. In the structure of the cam contact portion of the driven valve mechanism, the sliding surface of the cam contact portion that slides with the cam has a surface roughness of 0.0.
This can be solved by providing a titanium nitride coating layer having a thickness of 2 μRz to 0.7 μRz.
【0008】[0008]
【作用】上記の構成によれば、前記カム接触部の前記窒
化チタンの被覆層は、前記カムと摺動することにより前
記カムの摺動面を研磨する。このため、カム側の摺動面
に予め高精度な表面処理を施さなくても面粗度が改善さ
れて、カム及びカム接触部における摩擦損失が低減され
る。According to the above structure, the titanium nitride coating layer of the cam contact portion slides on the cam to polish the sliding surface of the cam. For this reason, the surface roughness is improved even if the sliding surface on the cam side is not subjected to highly precise surface treatment in advance, and the friction loss at the cam and the cam contact portion is reduced.
【0009】一方、前記被覆層の表面粗さが0.7μR
zより大きい(面が粗い)場合は、摺動により前記カム
が大きく摩耗して動弁機構の精度が維持できなくなる。
また、前記被覆層の表面粗さが0.02μRzより小さ
い(面が平滑)場合には、その表面処理コストが高くな
り、更に、カムの表面粗さも余り改善されない。On the other hand, the surface roughness of the coating layer is 0.7 μR.
If it is larger than z (the surface is rough), the cam causes great wear due to sliding, and the accuracy of the valve mechanism cannot be maintained.
When the surface roughness of the coating layer is smaller than 0.02 μRz (the surface is smooth), the surface treatment cost is high and the surface roughness of the cam is not improved so much.
【0010】[0010]
【実施例】図1は本発明に係る動弁機構のカム接触部構
造の一実施例を組み込んだ、直打動弁系内燃機関の要部
の断面図を示す。同図において符号1は、図示しない内
燃機関のクランクシャフトの回転と同期して回転するカ
ムシャフトに設けられたカムである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a main portion of a direct drive type valve operating internal combustion engine incorporating an embodiment of a cam contact portion structure of a valve mechanism according to the present invention. In the figure, reference numeral 1 is a cam provided on a camshaft that rotates in synchronization with rotation of a crankshaft of an internal combustion engine (not shown).
【0011】符号2はバルブリフタでシリンダブロック
5の所定位置に組み込まれ、カムシャフトと共にカム1
が回転すると、カム1のノーズに押圧されてバルブ3を
下方向に押圧する。バルブ3の図示されない先端部には
吸気弁または排気弁を構成する弁体が設けられており、
カム1により下向きに押圧されるとその弁体が吸気ポー
トまたは排気ポートを開弁する。一方、バルブ3はその
外周に設けられたバルブスプリング4により常時上向き
に付勢されているため、カム1に下向きに押圧されてい
るときを除いて、吸気ポートまたは排気ポートは閉弁さ
れる。Reference numeral 2 is a valve lifter, which is incorporated in a predetermined position of the cylinder block 5, and is provided with a cam shaft and a cam 1.
When is rotated, it is pressed by the nose of the cam 1 and presses the valve 3 downward. A valve body that constitutes an intake valve or an exhaust valve is provided at a tip end portion (not shown) of the valve 3,
When pressed downward by the cam 1, the valve body opens the intake port or the exhaust port. On the other hand, since the valve 3 is constantly urged upward by the valve spring 4 provided on the outer periphery thereof, the intake port or the exhaust port is closed except when it is pressed downward by the cam 1.
【0012】また、符号7は本実施例の構造の要部でカ
ム接触部に相当するシムである。シム7は構造用炭素
鋼、構造用炭素鋼、炭素工具鋼、合金工具鋼等を母材と
し、カムと摺動する摺動面に被覆層6を有している。被
覆層6は膜圧0.5〜10μm程度の窒化チタン(Ti
N)膜で、イオンプレーティング等の物理蒸着(PV
D)または、化学蒸着(CVD)により形成される。Reference numeral 7 is a shim corresponding to a cam contact portion which is a main portion of the structure of this embodiment. The shim 7 is made of structural carbon steel, structural carbon steel, carbon tool steel, alloy tool steel, etc. as a base material, and has a coating layer 6 on the sliding surface that slides on the cam. The coating layer 6 is made of titanium nitride (Ti) having a film thickness of about 0.5 to 10 μm.
N) film, physical vapor deposition such as ion plating (PV
D) or chemical vapor deposition (CVD).
【0013】シム7は、バルブリフタ2にはめ込まれて
カム接触部として作用する他、カム1とバルブ3の高さ
方向の位置関係を調整するための部材でもある。つま
り、シム7の厚さを調整することによりカム1やバルブ
リフタ2の加工精度等による誤差を相殺することがで
き、バルブ3はこれにより開閉弁動作を精度良く行うこ
とができる。The shim 7 is fitted in the valve lifter 2 to act as a cam contact portion, and is also a member for adjusting the positional relationship between the cam 1 and the valve 3 in the height direction. That is, by adjusting the thickness of the shim 7, it is possible to cancel an error due to the processing accuracy of the cam 1 and the valve lifter 2, and the valve 3 can perform the opening / closing operation with high accuracy.
【0014】図2及び図3は、シムの表面粗さの適正範
囲を説明するための図を示す。以下、各図に基づいてシ
ムの表面粗さの適正範囲について説明する。2 and 3 are views for explaining the proper range of the surface roughness of the shim. Hereinafter, the appropriate range of the surface roughness of the shim will be described based on each drawing.
【0015】図2はカムとシムを所定条件で摺動させた
場合のカムノーズの摩耗量とシムの初期表面粗さとの関
係を示す。同図において○をプロットした点は所定の摺
動条件でカムとシムを摺動させて実験的に求めた点であ
る。尚、カムとシムの摺動条件は、以下に示す通りとす
る。FIG. 2 shows the relationship between the wear amount of the cam nose and the initial surface roughness of the shim when the cam and the shim are slid under predetermined conditions. In the figure, the points plotted with ◯ are the points obtained experimentally by sliding the cam and shim under predetermined sliding conditions. The sliding conditions of the cam and shim are as shown below.
【0016】内燃機関の形式;直列4気筒、2000
cc、ダブルオーバーヘッドカムシャフト(DOH
C)、16バルブ 機関回転数 ;1000rpm 使用潤滑オイル;5W−30 オイル温度 ;80℃ 摺動時間 ;200h また、本試験に使用したカムは、合金鋳鉄チル製でその
摺動面の表面粗さは3.2μRzである。Type of internal combustion engine: in-line 4-cylinder, 2000
cc, double overhead camshaft (DOH
C), 16 valves Engine speed: 1000 rpm Lubricating oil used: 5W-30 Oil temperature: 80 ° C Sliding time: 200 h The cam used in this test was made of alloy cast iron chill, and the surface roughness of its sliding surface was Is 3.2 μRz.
【0017】同図に示すように、カムノーズの摩耗量は
シムの初期表面粗さが粗いほど大きくなり、その表面粗
さが0.7μRzを超える辺りから、急激にカムノーズ
の摩耗量が増加する。また、カムノーズは給排気バルブ
を開閉するために、ある程度の精度が要求される部位で
ある。このため、同図に示すカムノーズ摩耗試験の結果
から、本実施例構造のシムの摺動面における初期表面粗
さの適正範囲を求めると、0.7μRz以下となる。As shown in the figure, the wear amount of the cam nose becomes larger as the initial surface roughness of the shim becomes rougher, and the wear amount of the cam nose sharply increases when the surface roughness exceeds 0.7 μRz. The cam nose is a part that requires a certain degree of accuracy to open and close the supply / exhaust valve. Therefore, when the proper range of the initial surface roughness on the sliding surface of the shim of the present embodiment structure is obtained from the result of the cam nose wear test shown in the same figure, it becomes 0.7 μRz or less.
【0018】図3は、上記の試験に用いた内燃機関を3
000rpmで回転させた時の動弁系の摩擦損失と、シ
ムの初期表面粗さとの関係を表す。同図中、実線は本実
施例構造のシムを用いた動弁系の摩擦損失を示し、二点
鎖線は、合金鋳鉄にリン酸塩皮膜を施した従来のシムを
用いた動弁系の摩擦損失を示す。FIG. 3 shows the internal combustion engine used in the above test.
The relationship between the friction loss of the valve train when rotated at 000 rpm and the initial surface roughness of the shim is shown. In the figure, the solid line indicates the friction loss of the valve train using the shim of the present embodiment structure, and the two-dot chain line indicates the friction loss of the valve train using the conventional shim made of alloy cast iron with a phosphate coating. Indicates loss.
【0019】尚、本試験においては、摩擦損失の測定を
しようとする動弁系のカムシャフトを、トルク計を介し
てモータで回転させており、カムシャフトが所定の回転
数に達したときにトルク計が検出するトルクを動弁系の
摩擦損失としている。In this test, the camshaft of the valve train for which friction loss is to be measured is rotated by a motor via a torque meter, and when the camshaft reaches a predetermined rotation speed. The torque detected by the torque meter is used as the friction loss of the valve train.
【0020】同図に示すように、本実施例構造のシムを
用いた動弁系の摩擦損失は、シムの表面粗さが粗い程大
きくなり、0.7μRzを超える辺りで従来の動弁系に
おける摩擦損失と等しくなる。As shown in the figure, the friction loss of the valve operating system using the shim of this embodiment becomes larger as the surface roughness of the shim becomes rougher, and the friction loss of the conventional valve operating system exceeds 0.7 μRz. Is equal to the friction loss at.
【0021】従って、本実施例構造のシムは、摺動面の
表面粗さが0.7μRz以下であれば、カムノーズを過
摩耗させることなく適当に研磨して、摺動時における摩
擦損失を低減させることができる。Therefore, in the shim of this embodiment, when the surface roughness of the sliding surface is 0.7 μRz or less, the cam nose is appropriately ground without excessive wear to reduce friction loss during sliding. Can be made
【0022】一方、シムの摺動面を所定の表面粗さにす
るためには、この摺動面を研磨する必要がある。この研
磨は、平滑な面を得ようとする程高精度な設備や、長い
加工時間を必要として、動弁系のコスト上昇を招いてし
まう。このため、本実施例においては、特に0.02μ
Rz以下の表面粗さは過剰品質であるとして除き、表面
粗さを0.02μRz〜0.7μRzに限定している。On the other hand, in order to make the sliding surface of the shim have a predetermined surface roughness, it is necessary to polish this sliding surface. This polishing requires highly accurate equipment and a long processing time to obtain a smooth surface, and thus increases the cost of the valve train. Therefore, in this embodiment, in particular, 0.02 μ
The surface roughness of Rz or less is removed as an excessive quality, and the surface roughness is limited to 0.02 μRz to 0.7 μRz.
【0023】尚、本実施例構造のシムにおいては、所定
の表面粗さを得るのに研磨を行っている。また、TiN
の被覆層が薄いため、この被覆を行っても摺動面の表面
粗さは母材の表面粗さとほとんど変わらない。このた
め、摺動面の研磨はTiNの被覆前に母材に対して行っ
ても、TiNの被覆後にこの被覆層に対して行っても良
い。The shims of the structure of this embodiment are ground to obtain a predetermined surface roughness. Also, TiN
Since this coating layer is thin, the surface roughness of the sliding surface is almost the same as the surface roughness of the base material even if this coating is performed. Therefore, polishing of the sliding surface may be performed on the base material before coating with TiN or on the coating layer after coating with TiN.
【0024】図4は、本実施例及び従来のカム接触部構
造のシムとカムとが摺動した際の摩擦損失と機関回転数
の関係を表す図を示す。FIG. 4 is a diagram showing the relationship between the friction loss and the engine speed when the shim and the cam of the cam contact structure of the present embodiment and the conventional cam slide.
【0025】同図において、破線はSMC15浸炭材を
シムの母材として被覆層にリン酸塩皮膜を用いた場合を
示し、一点鎖線、二点鎖線は、それぞれ従来セラミック
系材料の被覆層として知られているCrN、及びCrN
とCrの混合皮膜を用いた場合を示している。また、同
図中実線は本実施例構造のシムを用いた動弁機構におけ
る動弁系の摩擦損失を示している。In the same figure, the broken line shows the case where a phosphate coating is used for the coating layer using the SMC15 carburized material as the base material of the shim, and the one-dot chain line and the two-dot chain line are known as the coating layers of conventional ceramic materials CrN and CrN
The case where a mixed film of Cr and Cr is used is shown. The solid line in the figure indicates the friction loss of the valve train in the valve train using the shim of the present embodiment.
【0026】この場合、同図中、実線で示した本実施例
構造のシムは、母材にSKD11を用い、摺動面にあた
る面を0.1μRzに研磨した後イオンプレーティング
により4μmのTiNを被覆した構成である。また、同
図の試験を実施する前に、図5に示す条件で、カムとシ
ムのすり合わせを行っているため、図4に示す結果は、
カムとシムが十分に平滑化された状態での結果である。In this case, in the shim of this embodiment shown by the solid line in the figure, SKD11 was used as the base material, the surface corresponding to the sliding surface was polished to 0.1 μRz, and then 4 μm TiN was formed by ion plating. It is a covered structure. Before the test shown in FIG. 4 is performed, the cam and shim are rubbed together under the conditions shown in FIG. 5, so the result shown in FIG.
This is the result with the cams and shims fully smoothed.
【0027】本実施例構造のシムのTiN被覆膜は、上
記したように耐摩耗性等の機械的強度に優れ、かつ摺動
するカムを研磨して摺動時における摩擦を低減させるよ
うに作用する。このため、図4から明らかなように、本
実施例構造のシムは、従来のいずれのシムと比べても、
動弁系に生じる摩擦損失を、全機関回転数領域において
小さく抑えることができる。As described above, the shim TiN coating film of the structure of this embodiment is excellent in mechanical strength such as abrasion resistance, and the sliding cam is polished to reduce friction during sliding. To work. Therefore, as is clear from FIG. 4, the shim of the present embodiment structure is
Friction loss generated in the valve train can be suppressed to be small in the entire engine speed range.
【0028】従って、本実施例の構成によれば内燃機関
の燃費を向上させることが可能となり、同時にカムとシ
ムの摺動面における摩擦熱の発生及び摩耗が抑制され、
動弁機構の精度維持及び耐久性の向上を図ることができ
る。Therefore, according to the structure of this embodiment, it is possible to improve the fuel consumption of the internal combustion engine, and at the same time, the generation and wear of frictional heat on the sliding surfaces of the cam and shim are suppressed.
It is possible to maintain the accuracy and improve the durability of the valve mechanism.
【0029】尚、本実施例において、シムへの被覆膜形
成は摺動面だけとして説明したが、これに限るものでは
なく、シムの外周面及び摺動面と反対側の面等に被覆し
てもよい。これにより、シムの両面を摺動面として扱う
ことができ、組み付け時の表裏判定が不要となる。In the present embodiment, the coating film is formed on the shim only on the sliding surface, but the present invention is not limited to this. The outer peripheral surface of the shim and the surface on the side opposite to the sliding surface are coated. You may. As a result, both sides of the shim can be treated as sliding surfaces, and front / back determination at the time of assembly is unnecessary.
【0030】また、上記の実施例のようにシムの一面の
みにTiNを被覆して、一面だけを摺動面とする場合に
は、表裏誤組み付け防止機構を設けてもよい。In the case where only one surface of the shim is coated with TiN and only one surface is used as the sliding surface as in the above-mentioned embodiment, a mechanism for preventing wrong mounting on the front and back sides may be provided.
【0031】図6に、この表裏誤組み付け機構の一例を
示す。シム11の被服層12と反対側の、バルブリフタ
13と嵌合する部位には、凹部14が設けられている。
バルブリフタ13のシム11と嵌合する部位には、凹部
14と嵌合する凸部15が設けられている。このため、
仮にシム11の表裏を誤って組み付けようとした場合、
シム11とバルブリフタ13がうまく嵌合せず、シムの
表裏誤組み付けが防止される。FIG. 6 shows an example of this front and back wrong assembly mechanism. A recess 14 is provided at a portion of the shim 11 opposite to the clothing layer 12 and fitted with the valve lifter 13.
At a portion of the valve lifter 13 that fits with the shim 11, a convex portion 15 that fits with the concave portion 14 is provided. For this reason,
If you try to assemble the front and back of the shim 11 by mistake,
The shim 11 and the valve lifter 13 do not fit well, which prevents wrong mounting of the shim on the front and back.
【0032】また、上記の実施例においては、カム接触
部としてシムに限定して説明したが、カム接触部はこれ
に限るものではなく、例えば、シムを使用しないバルブ
リフタの頂面やロッカーアームのパッド面等、上記のシ
ムと同様にカムと摺動する部位であればよい。In the above embodiment, the shim is used as the cam contact portion, but the cam contact portion is not limited to this. For example, the top surface of the valve lifter or the rocker arm without the shim is not used. Any portion, such as a pad surface, that slides on the cam, similar to the shim, may be used.
【0033】[0033]
【発明の効果】上述の如く、本発明によれば、カム接触
部の摺動面は、表面粗さが0.02μRz〜0.5μR
zのTiNであることから、カムの表面粗さが摺動によ
り改善される。このため、動弁機構における摩擦損失が
大幅に低減され、内燃機関の燃費が向上する。また、本
発明に係る構造のカム接触部とカムとの摺動において
は、摩耗及び摩擦熱が抑制されることから、カム接触部
の耐久性の向上と、開閉弁タイミング精度の長期間維持
を図ることができる。As described above, according to the present invention, the sliding surface of the cam contact portion has a surface roughness of 0.02 μRz to 0.5 μR.
Since it is TiN of z, the surface roughness of the cam is improved by sliding. Therefore, the friction loss in the valve mechanism is significantly reduced, and the fuel economy of the internal combustion engine is improved. Further, since wear and frictional heat are suppressed during sliding between the cam contact portion and the cam of the structure according to the present invention, durability of the cam contact portion is improved and on-off valve timing accuracy is maintained for a long period of time. Can be planned.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明に係る動弁機構のカム接触部構造の一実
施例を組み込んだ、直打動弁系内燃機関の要部の断面図
である。FIG. 1 is a sectional view of a main part of a direct-acting valve-operated internal combustion engine incorporating an embodiment of a cam contact portion structure of a valve mechanism according to the present invention.
【図2】本実施例構造のシムの表面粗さとカムノーズの
摩耗量との関係を表す図である。FIG. 2 is a diagram showing the relationship between the surface roughness of the shim and the wear amount of the cam nose of the structure of this embodiment.
【図3】本実施例構造のシムの表面粗さと動弁系の摩擦
損失との関係を表す図である。FIG. 3 is a diagram showing the relationship between the surface roughness of the shim and the friction loss of the valve train in the structure of the present embodiment.
【図4】本実施例及び従来構造のシムにおける摩擦損失
と機関回転数の関係を表す図である。FIG. 4 is a graph showing the relationship between friction loss and engine speed in shims of this embodiment and a conventional structure.
【図5】本実施例構造のシムとカムのすり合わせ条件を
示す図表である。FIG. 5 is a chart showing a condition for adjusting a shim and a cam in the structure of the present embodiment.
【図6】本実施例構造のシムの他の実施例である。FIG. 6 is another embodiment of the shim of the present embodiment structure.
1 カム 2、13 バルブリフタ 3 バルブ 4 バルブスプリング 6、12 被覆層 7、11 シム 1 cam 2,13 valve lifter 3 valve 4 valve spring 6,12 coating layer 7,11 shim
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原田 弘司 愛知県豊田市トヨタ町1番地 トヨタ自動 車株式会社内 (72)発明者 小沢 仁 愛知県豊田市トヨタ町1番地 トヨタ自動 車株式会社内 (72)発明者 守谷 嘉人 愛知県豊田市トヨタ町1番地 トヨタ自動 車株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Harada 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor, Hitoshi Ozawa 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. ( 72) Inventor Yoshito Moriya 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd.
Claims (1)
て、該カムの回転運動を直線往復運動に変換し、所定の
ポートを開閉弁する弁機構を駆動する動弁機構のカム接
触部構造において、 前記カムと摺動するカム接触部の摺動面に、表面粗さを
0.02μRz乃至0.7μRzとした窒化チタンの被
覆層を設けることを特徴とする動弁機構のカム接触部構
造。1. A cam contact portion of a valve mechanism that slides on a cam that performs a predetermined rotary motion to convert the rotary motion of the cam into a linear reciprocating motion and drive a valve mechanism that opens and closes a predetermined port. In the structure, on the sliding surface of the cam contact portion that slides on the cam, a titanium nitride coating layer having a surface roughness of 0.02 μRz to 0.7 μRz is provided, and the cam contact portion of the valve operating mechanism is characterized. Construction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15055392A JP3148362B2 (en) | 1992-06-10 | 1992-06-10 | Cam contact structure of valve train |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15055392A JP3148362B2 (en) | 1992-06-10 | 1992-06-10 | Cam contact structure of valve train |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05340213A true JPH05340213A (en) | 1993-12-21 |
JP3148362B2 JP3148362B2 (en) | 2001-03-19 |
Family
ID=15499398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15055392A Expired - Lifetime JP3148362B2 (en) | 1992-06-10 | 1992-06-10 | Cam contact structure of valve train |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3148362B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5809842A (en) * | 1995-06-26 | 1998-09-22 | Sumitomo Electric Industries, Ltd. | Ceramic sliding component |
WO1999047810A1 (en) * | 1998-03-19 | 1999-09-23 | Sumitomo Electric Industries, Ltd. | Combination of shim and cam |
EP0967384A2 (en) * | 1998-04-24 | 1999-12-29 | Sumitomo Electric Industries, Ltd | Fuel injection pump |
WO2004081252A1 (en) * | 2003-03-10 | 2004-09-23 | Kabushiki Kaisha Riken | Nitrided valve lifter and method for manufacture thereof |
KR102100280B1 (en) * | 2019-12-10 | 2020-04-13 | 김충호 | A method for manufacturing of valve trim for improving performance Using harsh conditions of Electric Power Plant and valve trim thereof |
-
1992
- 1992-06-10 JP JP15055392A patent/JP3148362B2/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5809842A (en) * | 1995-06-26 | 1998-09-22 | Sumitomo Electric Industries, Ltd. | Ceramic sliding component |
WO1999047810A1 (en) * | 1998-03-19 | 1999-09-23 | Sumitomo Electric Industries, Ltd. | Combination of shim and cam |
US6237441B1 (en) | 1998-03-19 | 2001-05-29 | Sumitomo Electric Industries, Ltd. | Combination of shim and cam |
EP0967384A2 (en) * | 1998-04-24 | 1999-12-29 | Sumitomo Electric Industries, Ltd | Fuel injection pump |
EP0967384A3 (en) * | 1998-04-24 | 2001-04-04 | Sumitomo Electric Industries, Ltd | Fuel injection pump |
US6279454B1 (en) | 1998-04-24 | 2001-08-28 | Sumitomo Electric Industries, Ltd. | Fuel injection pump |
WO2004081252A1 (en) * | 2003-03-10 | 2004-09-23 | Kabushiki Kaisha Riken | Nitrided valve lifter and method for manufacture thereof |
KR102100280B1 (en) * | 2019-12-10 | 2020-04-13 | 김충호 | A method for manufacturing of valve trim for improving performance Using harsh conditions of Electric Power Plant and valve trim thereof |
Also Published As
Publication number | Publication date |
---|---|
JP3148362B2 (en) | 2001-03-19 |
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