JP2000145413A - Seamless valve lifter and its manufacturing method - Google Patents
Seamless valve lifter and its manufacturing methodInfo
- Publication number
- JP2000145413A JP2000145413A JP10314139A JP31413998A JP2000145413A JP 2000145413 A JP2000145413 A JP 2000145413A JP 10314139 A JP10314139 A JP 10314139A JP 31413998 A JP31413998 A JP 31413998A JP 2000145413 A JP2000145413 A JP 2000145413A
- Authority
- JP
- Japan
- Prior art keywords
- valve lifter
- sliding surface
- cam
- valve
- shimless
- 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)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シムレスバルブリ
フタとその製造方法に関する。The present invention relates to a shimless valve lifter and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】内燃機関のバルブリフタには、カムとバ
ルブリフタとの間またはバルブリフタとバルブ軸端との
間の少なくとも一方にシムを配置するシム有りバルブリ
フタと、カムとバルブリフタとの間およびバルブリフタ
とバルブ軸端との間のいずれにもシムを配置しない直打
式のシム無しバルブリフタ（シムレスバルブリフタとい
う）とがある。そして、シムレスバルブリフタは、カム
摺動面を広くとれカムリフト量が大きくとれること、ま
たバルブリフト量もかせげるという利点を有している。
バルブリフタまたはシムの摺動面には、耐摩耗性と耐ス
カッフ性を確保するための表面処理が施される。従来
の、耐摩耗性と耐スカッフ性を確保するための表面処理
には、通常、つぎの２つの方法がある。 マンガン系りん酸塩皮膜処理 カム摺動面を研磨加工を施して平滑にした後マンガン系
りん酸塩皮膜処理を施す。これをシムに適用した例が特
開平６−２４８９１５号に開示されている。 タフトライド（軟窒化）処理 カム摺動面にタフトライド（軟窒化）処理を施す。処理
温度は約５８０°Ｃである。2. Description of the Related Art A valve lifter of an internal combustion engine includes a shim-provided valve lifter in which a shim is arranged at least between a cam and a valve lifter or between a valve lifter and a valve shaft end, a cam lifter and a valve lifter, and a valve lifter and a valve. There is a direct hit type shimless valve lifter (referred to as a shimless valve lifter) in which no shim is arranged between the shaft end. The shimless valve lifter has an advantage that a cam sliding surface can be widened so that a large cam lift amount can be obtained, and a valve lift amount can be reduced.
The sliding surface of the valve lifter or the shim is subjected to a surface treatment for ensuring abrasion resistance and scuff resistance. Conventional surface treatments for ensuring abrasion resistance and scuff resistance generally include the following two methods. Manganese phosphate coating treatment The manganese phosphate coating treatment is performed after the cam sliding surface is polished and smoothed. An example in which this is applied to a shim is disclosed in JP-A-6-248915. Tuftride (soft nitriding) treatment The cam sliding surface is subjected to tuftride (soft nitriding) treatment. The processing temperature is about 580 ° C.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の表面処
理を施したバルブリフタには、つぎの問題がある。 マンガン系りん酸塩皮膜処理リフタまたはシム マンガン系りん酸塩皮膜処理によりリフタまたはシムの
耐摩耗性、耐スカッフ性、初期なじみ性が向上するが、
マンガン系りん酸塩皮膜処理を施している間に、下地
（炭素鋼）が荒れ、その上のマンガン系りん酸塩皮膜層
の外表面も凹凸するので、使用後比較的早期にカムとの
摺動でマンガン系りん酸塩皮膜がとれて地金が露出した
時に、表面が荒れた地金がカムを摩耗させかつ潤滑性を
阻害し、カム摩耗性および潤滑性上不利になる。 タフトライド（軟窒化）処理リフタ タフトライド（軟窒化）処理をカム摺動面に施すことに
より、カム摺動面の耐摩耗性、耐スカッフ性を確保でき
るが、タフトライド（軟窒化）処理温度が高温（約５８
０°Ｃ）のため（母材が低炭素鋼の場合、焼なまり温度
の１６０°Ｃより高温）、リフタが柔らかくなり、とく
にバルブ軸端当り面の硬度が不足し、シムを当てる必要
が生じ、シムレス化が不可能になる。本発明の目的は、
カム摩耗性、潤滑性、バルブ軸端当り面硬度に問題を生
じることがないシムレスバルブリフタとその製造方法を
提供することにある。However, the conventional surface-treated valve lifter has the following problems. Manganese phosphate film-treated lifter or shim Manganese phosphate film treatment improves lifter or shim wear resistance, scuff resistance, and initial conformability.
During the manganese phosphate coating treatment, the base (carbon steel) becomes rough, and the outer surface of the manganese phosphate coating layer on top of it also becomes uneven, so that it slides relatively quickly with the cam after use. When the manganese-based phosphate film is removed by movement and the base metal is exposed, the base metal having a rough surface wears the cam and impairs lubricity, which is disadvantageous in terms of cam wear and lubricity. Tuftride (nitrocarburizing) treatment Lifter By applying tufftriding (nitrocarburizing) treatment to the cam sliding surface, the wear resistance and scuffing resistance of the cam sliding surface can be ensured. About 58
0 ° C) (when the base material is low carbon steel, higher than the annealing temperature of 160 ° C), the lifter becomes soft, and the hardness of the surface in contact with the valve shaft end is particularly insufficient, and it is necessary to apply a shim. , It becomes impossible to be simless. The purpose of the present invention is
It is an object of the present invention to provide a shimless valve lifter which does not cause problems in cam abrasion, lubricity, and surface hardness per valve shaft end, and a method of manufacturing the same.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成する本発
明は、つぎの通りである。 （１） カム摺動面とバルブ軸端当り面をもった、素材
が炭素鋼のシムレスバルブリフタであって、バルブ軸端
当り面の硬度が熱処理によりＨｖ６８０以上に高められ
ており、カム摺動面が研磨により粗さが０．４Ｒｚ以下
とされており、少なくともカム摺動面に、カム摺動面の
粗さの変化を０．２Ｒｚ以下に維持できる固体潤滑作用
のある表面処理が、バルブリフタ素材の焼なまり温度以
下の温度で、施されている、シムレスバルブリフタ。 （２） カム摺動面とバルブ軸端当り面をもったシムレ
スバルブリフタの製造方法であって、炭素鋼のシムレス
バルブリフタ素材を熱処理してバルブ軸端当り面の硬度
をＨｖ６８０以上に高める工程と、カム摺動面を研磨に
より粗さを０．４Ｒｚ以下とする工程と、少なくともカ
ム摺動面に、カム摺動面の粗さの変化を０．２Ｒｚ以下
に維持できる固体潤滑作用のある表面処理を、バルブリ
フタ素材の焼なまり温度以下の温度で、施す工程と、か
らなるシムレスバルブリフタの製造方法。The present invention to achieve the above object is as follows. (1) A carbonless shimless valve lifter having a cam sliding surface and a valve shaft end contact surface, and the hardness of the valve shaft end contact surface has been increased to Hv680 or more by heat treatment. The surface is made to have a roughness of 0.4 Rz or less by polishing, and at least the surface of the cam sliding surface has a solid lubricating action capable of maintaining the change in the roughness of the cam sliding surface at 0.2 Rz or less. A shimless valve lifter applied at a temperature below the annealing temperature of the material. (2) A method of manufacturing a shimless valve lifter having a cam sliding surface and a valve shaft end contact surface, wherein a step of heat-treating a carbon steel shimless valve lifter material to increase the hardness of the valve shaft end contact surface to Hv680 or more. And polishing the cam sliding surface to a roughness of 0.4 Rz or less, and at least the cam sliding surface has a solid lubricating action capable of maintaining a change in the roughness of the cam sliding surface at 0.2 Rz or less. Performing a surface treatment at a temperature equal to or lower than the annealing temperature of the valve lifter material.
【０００５】上記において、Ｈｖはビッカース硬さであ
り、ＲｚはμＲＺである。上記（１）のシムレスバルブ
リフタでは、熱処理によりバルブ軸端当り面の硬度がＨ
ｖ６８０以上とされているので（以下に説明するよう
に、低炭素鋼の表面への浸炭、その後の焼入れ、焼もど
しによりＨｖ６８０以上となる）、リフタのバルブ軸端
当り面はシム無しとすることができる。また、固体潤滑
作用のある表面処理がカム摺動面の粗さの変化を０．２
Ｒｚ以下に維持できる処理により行われるので（以下に
説明するように、鉄系りん酸塩皮膜処理により粗さの増
加が０．１Ｒｚ程度に抑えられるので、粗さの変化を
０．２Ｒｚ以下に維持できる処理は、可能である）、シ
ム無しでもカムの摩耗を押え、潤滑性を維持することが
でき、カム摺動面をシム無しとすることができる。これ
によって、カム摩耗性、潤滑性、バルブ軸端当り面硬度
に問題を生じることがないシムレスバルブリフタが得ら
れる。上記（２）のシムレスバルブリフタの製造方法で
は、低炭素鋼のシムレスバルブリフタ素材を熱処理（浸
炭、焼入れ、焼もどし）してバルブ軸端当り面の硬度を
Ｈｖ６８０以上に高め、その後、固体潤滑作用のある表
面処理をバルブリフタ素材の焼なまり温度（約１６０°
Ｃ）以下の温度（約７０°Ｃ）で施すので、固体潤滑作
用のある表面処理時にバルブ軸端当り面の硬度が減少す
ることがなく、バルブ軸端当り面の硬度が維持され、リ
フタのバルブ軸端当り面はシム無しとすることができ
る。また、固体潤滑作用のある表面処理がカム摺動面の
粗さの変化を０．２Ｒｚ以下に維持できる処理により行
われるので（以下に説明するように、鉄系りん酸塩皮膜
処理により粗さの増加が０．１Ｒｚ程度に抑えられるの
で、粗さの変化を０．２Ｒｚ以下に維持できる処理は、
可能である）、シム無しでもカムの摩耗を押え、潤滑性
を維持することができ、カム摺動面をシム無しとするこ
とができる。これによって、カム摩耗性、潤滑性、バル
ブ軸端当り面硬度に問題を生じることがないシムレスバ
ルブリフタが得られる。In the above, Hv is Vickers hardness, and Rz is μRZ. In the shimless valve lifter of the above (1), the hardness of the contact surface of the valve shaft end is H by heat treatment.
v680 or more (as described below, the surface of low-carbon steel is carburized, then quenched and tempered to make it Hv680 or more), so that the lifter valve shaft end contact surface has no shim. Can be. In addition, the surface treatment having a solid lubricating effect reduces the change in the roughness of the cam sliding surface by 0.2.
Since the treatment is performed by a treatment that can be maintained at Rz or less (as described below, the increase in roughness is suppressed to about 0.1 Rz by the iron-based phosphate coating treatment, so that the change in roughness is reduced to 0.2 Rz or less. Processing that can be maintained is possible), even without a shim, can suppress wear of the cam, maintain lubrication, and eliminate the shim on the cam sliding surface. As a result, a shimless valve lifter that does not cause any problems in cam abrasion, lubricity, and surface hardness per valve shaft end can be obtained. In the method for manufacturing a shimless valve lifter according to the above (2), the hardness of the valve shaft end contact surface is increased to Hv680 or more by heat-treating (carburizing, quenching, and tempering) the low-carbon steel shimless valve lifter material. An effective surface treatment is applied to the annealing temperature of the valve lifter material (about 160 °
C) Since the treatment is performed at the following temperature (about 70 ° C.), the hardness of the contact surface of the valve shaft does not decrease during the surface treatment having a solid lubricating action, the hardness of the contact surface of the valve shaft is maintained, and the lifter The valve shaft end contact surface can be shim-free. In addition, since the surface treatment having a solid lubricating effect is performed by a treatment capable of maintaining the change in the roughness of the cam sliding surface at 0.2 Rz or less (as described below, the roughness is reduced by the iron-based phosphate coating treatment). Is suppressed to about 0.1 Rz, the processing for maintaining the change in roughness at 0.2 Rz or less is as follows.
It is possible to suppress the abrasion of the cam even without the shim, maintain the lubricity, and make the cam sliding surface without the shim. As a result, a shimless valve lifter that does not cause any problems in cam abrasion, lubricity, and surface hardness per valve shaft end can be obtained.
【０００６】[0006]
【発明の実施の形態】図１は本発明実施例のシムレスバ
ルブリフタとその近傍の構造を示し、図２は本発明実施
例のシムレスバルブリフタの製造方法の工程を示す。ま
ず、本発明実施例のシムレスバルブリフタを説明する。
図１に示すように、本発明実施例のシムレスバルブリフ
タ１０は、カム摺動面１１とバルブ軸端当り面１２をも
った、素材が低炭素鋼（炭素量が重量％で０．３０以下
が低炭素鋼）の、直打式のシムレスバルブリフタからな
る。であり、バルブリフタ素材の低炭素鋼は、炭素量が
重量％で０．３０以下であればよいが、たとえば炭素量
が重量％で０．１５のＪＩＳ、ＳＣＭ４１５などを用い
る。FIG. 1 shows a structure of a shimless valve lifter according to an embodiment of the present invention and its vicinity, and FIG. 2 shows steps of a method of manufacturing the shimless valve lifter of the embodiment of the present invention. First, a shimless valve lifter according to an embodiment of the present invention will be described.
As shown in FIG. 1, a shimless valve lifter 10 according to an embodiment of the present invention has a cam sliding surface 11 and a valve shaft end contact surface 12 and is made of low carbon steel (having a carbon content of 0.30 or less by weight%). Is a low-carbon steel), direct-drive shimless valve lifter. The low-carbon steel used as the valve lifter material may have a carbon content of 0.30 or less in terms of% by weight. For example, JIS or SCM415 having a carbon amount of 0.15 in terms of% by weight is used.
【０００７】バルブ軸端当り面１２の硬度は、熱処理に
よりＨｖ６８０以上に高められている。熱処理は、浸
炭、焼入れ、焼もどしである。浸炭により表面の炭素量
が増え、その部分が焼入れ、焼もどしにより、硬度が上
がる。熱処理はバルブリフタ素材全体に対して行われる
ので、バルブリフタ全体表面がＨｖ６８０以上の硬度に
なる。この熱処理により、バルブ軸端当り面１２の硬度
は約Ｈｖ６８０以上となる。後で行われる固体潤滑作用
のある表面処理が、バルブリフタ素材の焼なまり温度以
下の温度で、施されるので、固体潤滑作用のある表面処
理時にバルブ軸端当り面１２の硬度が低下することはな
く、硬度は維持される。そのため、バルブ軸端３０が直
接当たっても、硬度は十分であり、シムを介在させる必
要がなくなり、シムレスバルブリフタが可能となる。The hardness of the valve shaft end contact surface 12 is increased to Hv680 or more by heat treatment. The heat treatment is carburizing, quenching, and tempering. The amount of carbon on the surface is increased by carburization, and the hardness is increased by quenching and tempering that portion. Since the heat treatment is performed on the entire valve lifter material, the entire surface of the valve lifter has a hardness of Hv680 or more. By this heat treatment, the hardness of the valve shaft end contact surface 12 becomes about Hv680 or more. Since the surface treatment having a solid lubricating action to be performed later is performed at a temperature equal to or lower than the annealing temperature of the valve lifter material, the hardness of the valve shaft end contact surface 12 during the surface treatment having the solid lubricating action is not reduced. And the hardness is maintained. Therefore, even if the valve shaft end 30 directly hits, the hardness is sufficient, and it is not necessary to interpose a shim, and a shimless valve lifter can be realized.
【０００８】一方、カム摺動面１１は研磨により粗さが
０．４Ｒｚ以下にされる。カム摺動面１１も熱処理によ
り硬度が高められているので、加工は研磨によってい
る。研磨後、少なくともカム摺動面１１（リフタ全面で
もよい）に、カム摺動面の粗さの変化を０．２Ｒｚ以下
に維持できる固体潤滑作用のある表面処理が、バルブリ
フタ素材の焼なまり温度以下の温度で、施されている。
表面処理前後のカム摺動面の粗さの変化を０．２Ｒｚ以
下に維持できる固体潤滑作用のある表面処理は、鉄系り
ん酸塩皮膜処理である。鉄系りん酸塩皮膜１３（厚さが
１μｍ程度）は、Ｆｅの他、Ｍｏを含む。鉄系りん酸塩
皮膜処理の場合は、表面処理前後の下地粗さ変化（増
加）が小さく、０．２Ｒｚ以下であり、０．１Ｒｚ程度
である。したがって、研磨で下地の表面粗さが０．４Ｒ
ｚの場合は表面処理後は下地の表面粗さは０．５Ｒｚ程
度となる。従来のマンガン系りん酸塩皮膜処理の場合
は、たとえ研磨で下地の表面粗さを０．４Ｒｚにしてお
いても、表面処理後は１〜２．０Ｒｚ程度になり、研磨
の意味がなくなる。実際の使用において、カム摺動面１
１はカム２０と摺動することにより、早期にりん酸塩皮
膜がとれて無くなり、下地が露出し、カムとカム摺動面
との直接摺動接触になるので、表面処理後の粗さ１〜
２．０Ｒｚの従来の場合は、比較的早期にカムが摩耗す
るが、表面処理後の粗さが０．７Ｒｚ以下の本発明の場
合は、カム３０の摩耗が従来に比べて大幅に抑制され
る。これによって、カム摺動面へのシムの配置を廃止す
ることができ、シムレスバルブリフタが可能となる。On the other hand, the roughness of the cam sliding surface 11 is reduced to 0.4 Rz or less by polishing. Since the hardness of the cam sliding surface 11 is also increased by the heat treatment, the processing is performed by polishing. After polishing, at least the cam sliding surface 11 (or the entire lifter surface) has a solid lubricating surface treatment capable of maintaining a change in the roughness of the cam sliding surface at 0.2 Rz or less. The temperature is given.
The surface treatment having a solid lubrication effect capable of maintaining the change in the roughness of the cam sliding surface before and after the surface treatment at 0.2 Rz or less is an iron-based phosphate film treatment. The iron-based phosphate film 13 (having a thickness of about 1 μm) contains Mo in addition to Fe. In the case of the iron-based phosphate film treatment, the change (increase) in the underlayer roughness before and after the surface treatment is small, 0.2 Rz or less, and about 0.1 Rz. Therefore, the surface roughness of the base is 0.4R by polishing.
In the case of z, the surface roughness of the base after the surface treatment is about 0.5 Rz. In the case of the conventional manganese-based phosphate film treatment, even if the surface roughness of the base is set to 0.4 Rz by polishing, the surface roughness is about 1 to 2.0 Rz after the surface treatment, and the meaning of polishing is lost. In actual use, the cam sliding surface 1
No. 1 slides against the cam 20 to remove the phosphate film at an early stage and disappears, exposing the base, and bringing into direct sliding contact between the cam and the cam sliding surface. ~
In the conventional case of 2.0 Rz, the cam wears relatively early, but in the case of the present invention in which the roughness after the surface treatment is 0.7 Rz or less, the wear of the cam 30 is significantly suppressed as compared with the conventional case. You. Thereby, the arrangement of the shim on the cam sliding surface can be eliminated, and a shimless valve lifter can be realized.
【０００９】つぎに、本発明実施例のシムレスバルブリ
フタの製造方法を説明する。図１、図２に示すように、
本発明実施例のシムレスバルブリフタの製造方法は、カ
ム摺動面１１とバルブ軸端当り面１２をもったシムレス
バルブリフタ１０の製造方法であって、低炭素鋼のシム
レスバルブリフタ素材を用意する工程１０１と、低炭素
鋼のシムレスバルブリフタ素材を熱処理してバルブ軸端
当り面１２の硬度をＨｖ６８０以上に高める工程１０２
と、カム摺動面１１を研磨により粗さを０．４Ｒｚ以下
とする工程１０３と、少なくともカム摺動面１１に、カ
ム摺動面の粗さの変化を０．２Ｒｚ以下に維持できる固
体潤滑作用のある表面処理を、バルブリフタ素材の焼な
まり温度以下の温度で、施す工程１０４と、からなる。
工程１０１〜１０４は、１０１、１０２、１０３、１０
４の順で行われる。Next, a method of manufacturing a shimless valve lifter according to an embodiment of the present invention will be described. As shown in FIGS. 1 and 2,
The method for manufacturing a shimless valve lifter according to the embodiment of the present invention is a method for manufacturing a shimless valve lifter 10 having a cam sliding surface 11 and a valve shaft end contact surface 12, and preparing a low carbon steel shimless valve lifter material. Step 101 and Step 102 of heat-treating the low carbon steel shimless valve lifter material to increase the hardness of the valve shaft end contact surface 12 to Hv680 or more.
A step 103 in which the roughness of the cam sliding surface 11 is reduced to 0.4 Rz or less by polishing; Performing an effective surface treatment at a temperature equal to or lower than the annealing temperature of the valve lifter material.
Steps 101 to 104 include 101, 102, 103, 10
This is performed in the order of 4.
【００１０】バルブリフタ素材の低炭素鋼は、炭素量が
重量％で０．３０以下であればよいが、たとえば炭素量
が重量％で０．１５のＪＩＳ、ＳＣＭ４１５などを用い
る。バルブ軸端当り面１２の硬度を、熱処理によりＨｖ
６８０以上に高める。熱処理は、浸炭、焼入れ、焼もど
しである。浸炭は素材を浸炭炉に入れ、たとえば１０４
０°Ｃで２時間保持し、焼入れはたとえば８５０°Ｃに
加熱後急冷し、焼もどしはたとえば低温焼もどしであ
り、たとえば２００°Ｃに加熱後徐冷する。熱処理はバ
ルブリフタ素材全体に対して行われるので、バルブリフ
タ全体表面がＨｖ６８０以上の硬度になる。この熱処理
により、バルブ軸端当り面１２の硬度は約Ｈｖ６８０以
上となる。後で行われる固体潤滑作用のある表面処理
が、バルブリフタ素材の焼なまり温度（約１６０°Ｃ）
以下の温度（約７０°Ｃ）で、施されるので、固体潤滑
作用のある表面処理時にバルブ軸端当り面１２の硬度が
低下することはなく、硬度は維持される。そのため、バ
ルブ軸端３０が直接当たっても、硬度は十分であり、シ
ムを介在させる必要がなくなり、シムレスバルブリフタ
が可能となる。The low-carbon steel used as the valve lifter material may have a carbon content of 0.30 or less in terms of% by weight. For example, JIS, SCM415 or the like having a carbon amount of 0.15 in terms of% by weight is used. The hardness of the contact surface 12 of the valve shaft end
Increase to 680 or more. The heat treatment is carburizing, quenching, and tempering. Carburizing involves placing the material in a carburizing furnace, e.g.
It is kept at 0 ° C. for 2 hours, quenched is heated to 850 ° C., for example, and then quenched, and tempering is, for example, low-temperature tempering. Since the heat treatment is performed on the entire valve lifter material, the entire surface of the valve lifter has a hardness of Hv680 or more. By this heat treatment, the hardness of the valve shaft end contact surface 12 becomes about Hv680 or more. The surface treatment with a solid lubrication effect performed later is the annealing temperature of the valve lifter material (about 160 ° C)
Since the application is performed at the following temperature (approximately 70 ° C.), the hardness of the valve shaft end contact surface 12 does not decrease during surface treatment having a solid lubricating action, and the hardness is maintained. Therefore, even if the valve shaft end 30 directly hits, the hardness is sufficient, and it is not necessary to interpose a shim, and a shimless valve lifter can be realized.
【００１１】一方、カム摺動面１１は研磨により粗さが
０．４Ｒｚ以下にされる。カム摺動面１１も熱処理によ
り硬度が高められているので、加工は研磨によってい
る。研磨後、少なくともカム摺動面１１（リフタ全面で
もよい）にカム摺動面の粗さの変化を０．２Ｒｚ以下に
維持できる固体潤滑作用のある表面処理を施す。表面処
理前後のカム摺動面の粗さの変化を０．２Ｒｚ以下に維
持できる固体潤滑作用のある表面処理は、鉄系りん酸塩
皮膜処理である。鉄系りん酸塩皮膜１３（厚さが１μｍ
程度）は、Ｆｅの他、Ｍｏを含む。鉄系りん酸塩皮膜処
理の場合は、表面処理前後の下地粗さ変化（増加）が小
さく、０．２Ｒｚ以下であり、０．１Ｒｚ程度である。
したがって、研磨で下地の表面粗さが０．４Ｒｚの場合
は表面処理後は下地の表面粗さは０．５Ｒｚ程度とな
る。従来のマンガン系りん酸塩皮膜処理の場合は、たと
え研磨で下地の表面粗さを０．４Ｒｚにしておいても、
表面処理後は１〜２．０Ｒｚ程度になり、研磨の意味が
なくなる。実際の使用において、カム摺動面１１はカム
２０と摺動することにより、早期にりん酸塩皮膜がとれ
て無くなり、下地が露出し、カムとカム摺動面との直接
摺動接触になるので、表面処理後の粗さ１〜２．０Ｒｚ
程度の従来の場合は、比較的早期にカムが摩耗する場合
があるが、表面処理後の粗さが０．７Ｒｚ以下の本発明
実施例の場合は、カム３０の摩耗が従来に比べて大幅に
抑制される。これによって、カム摺動面へのシムの配置
を廃止することができ、シムレスバルブリフタが可能と
なる。On the other hand, the roughness of the cam sliding surface 11 is reduced to 0.4 Rz or less by polishing. Since the hardness of the cam sliding surface 11 is also increased by the heat treatment, the processing is performed by polishing. After polishing, at least the cam sliding surface 11 (or the entire lifter surface) is subjected to a surface treatment having a solid lubricating action capable of maintaining a change in the roughness of the cam sliding surface at 0.2 Rz or less. The surface treatment having a solid lubrication effect capable of maintaining the change in the roughness of the cam sliding surface before and after the surface treatment at 0.2 Rz or less is an iron-based phosphate film treatment. Iron-based phosphate film 13 (1 μm thick
Degree) includes Mo in addition to Fe. In the case of the iron-based phosphate film treatment, the change (increase) in the underlayer roughness before and after the surface treatment is small, 0.2 Rz or less, and about 0.1 Rz.
Therefore, when the surface roughness of the base is 0.4 Rz by polishing, the surface roughness of the base is about 0.5 Rz after the surface treatment. In the case of the conventional manganese-based phosphate film treatment, even if the surface roughness of the base is set to 0.4 Rz by polishing,
After the surface treatment, it becomes about 1 to 2.0 Rz, and the meaning of polishing is lost. In actual use, the cam sliding surface 11 slides against the cam 20 so that the phosphate film is removed at an early stage, the base material is exposed, and the cam and the cam sliding surface come into direct sliding contact. Therefore, roughness after surface treatment 1 to 2.0 Rz
In the case of the prior art, the cam may be worn relatively early, but in the case of the embodiment of the present invention in which the roughness after the surface treatment is 0.7 Rz or less, the wear of the cam 30 is significantly larger than in the conventional case. Is suppressed. Thereby, the arrangement of the shim on the cam sliding surface can be eliminated, and a shimless valve lifter can be realized.
【００１２】[0012]
【発明の効果】請求項１のシムレスバルブリフタによれ
ば、熱処理によりバルブ軸端当り面の硬度がＨｖ６８０
以上とされており、その後の表面処理もバルブリフタ素
材の焼なまり温度以下の温度で処理されて硬度が維持さ
れるので、リフタのバルブ軸端当り面はシム無しとする
ことができる。また、固体潤滑作用のある表面処理がカ
ム摺動面の粗さの変化を０．２Ｒｚ以下に維持できる処
理により行われるので、シム無しでもカムの摩耗を押
え、潤滑性を維持することができ、カム摺動面をシム無
しとすることができる。これによって、カム摩耗性、潤
滑性、バルブ軸端当り面硬度に問題を生じることがない
シムレスバルブリフタが得られる。請求項２のシムレス
バルブリフタの製造方法によれば、低炭素鋼のシムレス
バルブリフタ素材を熱処理してバルブ軸端当り面の硬度
をＨｖ６８０以上に高め、その後、固体潤滑作用のある
表面処理をバルブリフタ素材の焼なまり温度以下の温度
で施すので、固体潤滑作用のある表面処理時にバルブ軸
端当り面の硬度が減少することがなく、バルブ軸端当り
面の硬度が維持され、リフタのバルブ軸端当り面はシム
無しとすることができる。また、固体潤滑作用のある表
面処理がカム摺動面の粗さの変化を０．２Ｒｚ以下に維
持できる処理により行われるので、シム無しでもカムの
摩耗を押え、潤滑性を維持することができ、カム摺動面
をシム無しとすることができる。これによって、カム摩
耗性、潤滑性、バルブ軸端当り面硬度に問題を生じるこ
とがないシムレスバルブリフタが得られる。According to the first aspect of the present invention, the hardness of the contact surface of the valve shaft end is Hv680 due to the heat treatment.
As described above, the subsequent surface treatment is performed at a temperature equal to or lower than the annealing temperature of the valve lifter material, and the hardness is maintained. Therefore, the surface of the lifter that comes into contact with the valve shaft end can be shim-free. In addition, since the surface treatment having a solid lubricating effect is performed by a process capable of maintaining the change in the roughness of the cam sliding surface at 0.2 Rz or less, the wear of the cam can be suppressed without lubrication and lubrication can be maintained. The cam sliding surface can be made without shims. As a result, a shimless valve lifter that does not cause any problems in cam abrasion, lubricity, and surface hardness per valve shaft end can be obtained. According to the method for manufacturing a shimless valve lifter of claim 2, the material of the shimless valve lifter made of low carbon steel is heat-treated to increase the hardness of the contact surface of the valve shaft to Hv680 or more. Since the temperature is lower than the annealing temperature of the material, the hardness of the contact surface of the valve shaft does not decrease during surface treatment with solid lubrication, the hardness of the contact surface of the valve shaft is maintained, and the valve shaft end of the lifter is maintained. The contact surface can be shimless. In addition, since the surface treatment having a solid lubricating effect is performed by a process capable of maintaining the change in the roughness of the cam sliding surface at 0.2 Rz or less, the wear of the cam can be suppressed without lubrication and lubrication can be maintained. The cam sliding surface can be made without shims. As a result, a shimless valve lifter that does not cause any problems in cam abrasion, lubricity, and surface hardness per valve shaft end can be obtained.
【図１】本発明実施例のシムレスバルブリフタとその近
傍の断面図である。FIG. 1 is a sectional view of a shimless valve lifter according to an embodiment of the present invention and its vicinity.
【図２】本発明実施例のシムレスバルブリフタの製造方
法の工程図である。FIG. 2 is a process chart of a method of manufacturing a shimless valve lifter according to an embodiment of the present invention.
１０ シムレスバルブリフタ １１ カム摺動面 １２ バルブ軸端当り面 １３ 鉄系りん酸皮膜 ２０ カム ３０ バルブ軸 DESCRIPTION OF SYMBOLS 10 Shimless valve lifter 11 Cam sliding surface 12 Valve shaft end contact surface 13 Iron-based phosphoric acid film 20 Cam 30 Valve shaft
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3G016 AA06 AA19 BA47 BB04 BB06 CA13 EA03 EA24 FA13 FA15 FA16 FA17 FA21 GA00 GA02 4K026 AA02 AA25 BA03 BB03 BB04 CA16 CA18 CA23 EA03 EA17 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G016 AA06 AA19 BA47 BB04 BB06 CA13 EA03 EA24 FA13 FA15 FA16 FA17 FA21 GA00 GA02 4K026 AA02 AA25 BA03 BB03 BB04 CA16 CA18 CA23 EA03 EA17
Claims (2)
た、素材が炭素鋼のシムレスバルブリフタであって、 バルブ軸端当り面の硬度が熱処理によりＨｖ６８０以上
に高められており、 カム摺動面が研磨により粗さが０．４Ｒｚ以下とされて
おり、 少なくともカム摺動面に、カム摺動面の粗さの変化を
０．２Ｒｚ以下に維持できる固体潤滑作用のある表面処
理が、バルブリフタ素材の焼なまり温度以下の温度で、
施されている、シムレスバルブリフタ。1. A carbonless shimless valve lifter having a cam sliding surface and a valve shaft end contact surface, wherein the hardness of the valve shaft end contact surface is increased to Hv680 or more by heat treatment. The sliding surface has a roughness of 0.4 Rz or less by polishing, and at least the cam sliding surface has a surface treatment having a solid lubricating action capable of maintaining the change in the roughness of the cam sliding surface at 0.2 Rz or less. , At a temperature below the annealing temperature of the valve lifter material,
A shimless valve lifter.
シムレスバルブリフタの製造方法であって、 炭素鋼のシムレスバルブリフタ素材を熱処理してバルブ
軸端当り面の硬度をＨｖ６８０以上に高める工程と、 カム摺動面を研磨により粗さを０．４Ｒｚ以下とする工
程と、 少なくともカム摺動面に、カム摺動面の粗さの変化を
０．２Ｒｚ以下に維持できる固体潤滑作用のある表面処
理を、バルブリフタ素材の焼なまり温度以下の温度で、
施す工程と、からなるシムレスバルブリフタの製造方
法。2. A method of manufacturing a shimless valve lifter having a cam sliding surface and a valve shaft end contact surface, wherein the hardness of the valve shaft end contact surface is Hv680 or more by heat-treating a carbon steel shimless valve lifter material. A step of increasing the roughness of the cam sliding surface to 0.4 Rz or less by polishing; and a solid lubricating action capable of maintaining a change in the roughness of the cam sliding surface at least 0.2 Rz or less on the cam sliding surface. Surface treatment at a temperature below the annealing temperature of the valve lifter material,
And a method of manufacturing a shimless valve lifter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31413998A JP3546933B2 (en) | 1998-11-05 | 1998-11-05 | Shimless valve lifter and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31413998A JP3546933B2 (en) | 1998-11-05 | 1998-11-05 | Shimless valve lifter and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000145413A true JP2000145413A (en) | 2000-05-26 |
| JP3546933B2 JP3546933B2 (en) | 2004-07-28 |
Family
ID=18049707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31413998A Expired - Fee Related JP3546933B2 (en) | 1998-11-05 | 1998-11-05 | Shimless valve lifter and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3546933B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002069658A (en) * | 2000-09-05 | 2002-03-08 | Mizuno Tekkosho:Kk | Surface treatment method of follower for internal combustion engine |
| JP2006300053A (en) * | 2005-03-24 | 2006-11-02 | Honda Motor Co Ltd | Valve lifter and its manufacturing method |
-
1998
- 1998-11-05 JP JP31413998A patent/JP3546933B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002069658A (en) * | 2000-09-05 | 2002-03-08 | Mizuno Tekkosho:Kk | Surface treatment method of follower for internal combustion engine |
| JP4673963B2 (en) * | 2000-09-05 | 2011-04-20 | 株式会社水野鉄工所 | Surface treatment method for a follower for an internal combustion engine |
| JP2006300053A (en) * | 2005-03-24 | 2006-11-02 | Honda Motor Co Ltd | Valve lifter and its manufacturing method |
| JP4647528B2 (en) * | 2005-03-24 | 2011-03-09 | 本田技研工業株式会社 | Valve lifter and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3546933B2 (en) | 2004-07-28 |
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