JPS621081B2 - - Google Patents
Info
- Publication number
- JPS621081B2 JPS621081B2 JP53139152A JP13915278A JPS621081B2 JP S621081 B2 JPS621081 B2 JP S621081B2 JP 53139152 A JP53139152 A JP 53139152A JP 13915278 A JP13915278 A JP 13915278A JP S621081 B2 JPS621081 B2 JP S621081B2
- Authority
- JP
- Japan
- Prior art keywords
- rocker arm
- hardness
- less
- wear
- sintered
- 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
Links
- 239000002131 composite material Substances 0.000 claims description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 description 19
- 239000000956 alloy Substances 0.000 description 19
- 239000000463 material Substances 0.000 description 9
- 150000001247 metal acetylides Chemical class 0.000 description 7
- 238000005245 sintering Methods 0.000 description 7
- 239000007791 liquid phase Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
Description
【発明の詳細な説明】
この発明は、複合材製ロツカーアームに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rocker arm made of composite material.
内燃機関の動弁機構に用いられるローカーアー
ムは、従来、鋳鉄で形成し、カムとの摺動部は、
高速回転時に油膜切れが生じやすく且つ面圧も40
Kg／mm2以上になるため、冷し金によりチル化して
耐摩耗性を付与している。しかしながら、従来の
鋳鉄製ロツカーアームは比重が大きいために慣性
が大きく、そのため、スプリングを二重にする必
要があり、製作費が高くなり、かつ、重量が大で
あるためエンジン回転数をあげることができない
欠点があつた。 Loker arms used in internal combustion engine valve mechanisms have traditionally been made of cast iron, and the sliding part with the cam is made of cast iron.
Oil film tends to run out during high-speed rotation, and the surface pressure is 40
Since it exceeds Kg/mm 2 , it is chilled using a chilled metal to give it wear resistance. However, conventional cast iron Rotsuker arms have high inertia due to their high specific gravity, which necessitates doubling the springs, which increases production costs, and because they are heavy, it is difficult to increase the engine speed. There was a drawback that I couldn't do it.
エンジンの軽量化及び回転数の向上を図るため
には、ロツカーアームを軽量にすることが要望さ
れると共に、カムと摺動するパツト部は、強度が
高く、十分な耐摩耗性を有することが要求され
る。 In order to reduce the weight of the engine and increase the rotation speed, it is necessary to make the rocker arm lightweight, and the parts that slide on the cam must be strong and have sufficient wear resistance. be done.
上記要望に応えるには、実開昭52−98014号公
報に示されているようにロツカーアーム本体を軽
合金、例えば、アルミニウム合金製とし、パツト
部を耐摩耗性合金製とすることが好ましい。しか
しながら、従来提供されている耐摩耗性パツト材
は高比重であるため、パツト材の重量を小さくす
るにはパツトの体積を小さくしなければならない
が、アルミニウム合金等のバツクメタルは強度及
び硬度が小さいため、パツト材自体の強度、靭性
でロツカーアームの作動による衝撃荷重に耐える
必要があり、そのため、パツト材には下記の特性
が要求される。 In order to meet the above requirements, it is preferable that the rocker arm body be made of a light alloy, such as an aluminum alloy, and the part part be made of a wear-resistant alloy, as shown in Japanese Utility Model Application Publication No. 52-98014. However, the wear-resistant part materials conventionally provided have a high specific gravity, so in order to reduce the weight of the part material, the volume of the part must be reduced, but back metals such as aluminum alloy have low strength and hardness. Therefore, the pad material itself must have the strength and toughness to withstand the impact load caused by the operation of the rocker arm. Therefore, the pad material is required to have the following properties.
(1) 抗折力で60Kg／mm2以上の強度を有すること。
即ち、パツト部の面圧が40Kg／mm2以上に高くな
ることがあり、かつ、運転中に打撃を受けるた
め、60Kg／mm2以上の抗折力が必要である。(1) Must have a transverse rupture strength of 60Kg/mm 2 or more.
That is, the surface pressure of the pad portion can be as high as 40 Kg/mm 2 or more, and since it is subjected to blows during operation, a transverse rupture strength of 60 Kg/mm 2 or more is required.
しかしながら、パツト材のような形状、サイ
ズを有する部品を量産するには、製造工数、歩
留り、生産性等の理由から粉末冶金法によらざ
るを得ず、従つてパツト材は焼結合金となる
が、焼結合金の抗折力は一般に60Kg／mm2以下
で、上記所望値に達しない。尚、強度の優れた
焼結合金としてハイスの焼結合金があるが（抗
折力70Kg／mm2）、真空やH2ガス中で焼結しなれ
ばならず、かつ、焼結後に粉末鍛造して密度を
上げる必要があり、面倒な工程を時間と費用を
かけて行わなければならず、実用的でない。 However, in order to mass produce parts with the shape and size of part materials, powder metallurgy must be used for reasons such as manufacturing man-hours, yield, and productivity, and therefore part materials are made of sintered alloys. However, the transverse rupture strength of the sintered alloy is generally 60 Kg/mm 2 or less, which does not reach the above-mentioned desired value. Although high-speed steel sintered alloys have excellent strength (transverse rupture strength 70Kg/mm 2 ), they must be sintered in a vacuum or H 2 gas, and must be powder forged after sintering. In order to increase the density, it is necessary to carry out tedious and time-consuming processes, which is impractical.
(2) 密度が6.8ｇ／cm3以上であること。(2) Density must be 6.8 g/cm 3 or higher.
密度が6.8ｇ／cm3より低いと、面圧が高いた
めに摩耗が多くなり、又、ピツチングが起る。 If the density is lower than 6.8 g/cm 3 , the surface pressure is high, resulting in increased wear and pitting.
(3) 硬度がＨRC30以上であること。(3) Hardness must be H RC 30 or higher.
硬度がＨRC30以上ないとヘタリ摩耗を起し、
かつ、摩耗粉がパツト面とカム間にはさまれて
損耗、焼き付きを起す。 If the hardness is not H RC 30 or higher, permanent wear will occur.
In addition, wear particles are caught between the part surface and the cam, causing wear and seizure.
(4) 炭化物、複合炭化物が多く析出しているこ
と。(4) Many carbides and composite carbides are precipitated.
摺動時、カムに摩耗、焼き付け、ピツチング
を起させないため上記(3)の特性を持たせるため
に、炭化物、複合炭化物を析出させ、その部分
によつて耐摩耗性を付与する必要がある。 In order to provide the characteristic (3) above to prevent wear, seizure, and pitting of the cam during sliding, it is necessary to precipitate carbides and composite carbides and impart wear resistance to these parts.
(5) 焼結時の変形が可能な限り少ないこと。(5) Deformation during sintering should be as small as possible.
変形が多いと加工代が多くかかり、コスト高
になる。 If there is a lot of deformation, there will be a lot of processing cost, which will increase the cost.
この発明は、上記特性を有する焼結合金を、一
般の焼結合金と同様に単純安価な製造を用い、か
つ、ハイスのように高レンジの合金成分を添加す
ることなく製造し、十分な強度と耐摩耗性を有す
る焼結合金製チツプを、アルミニウム合金製本体
のパツト部に鋳ぐるみ一体とした複合材製ロツカ
ーアームを提供することを目的とするものであ
る。 This invention produces a sintered alloy having the above characteristics using simple and inexpensive manufacturing methods similar to general sintered alloys, without adding high-range alloy components like high speed steel, and with sufficient strength. The object of the present invention is to provide a rocker arm made of a composite material in which a chip made of a sintered alloy having wear resistance and wear resistance is integrally cast into a part of a body made of an aluminum alloy.
詳しくは、この発明に係るロツカーアームは、
ロツカーアーム本体がアルミニウム合金製であ
り、パツト部にC0.5〜2.0％、Co1.5〜4.0％、Mo
0.5〜６％、Cr4％以下、残部Feの成分からな
り、密度が6.8ｇ／cm3以上、硬度がＨRC30以上の
焼結合金製チツプを鋳ぐるみ一体としてなること
を特徴とするものである。 Specifically, the Rotzker arm according to the present invention includes:
The Rotsuker arm body is made of aluminum alloy, and the parts include C0.5~2.0%, Co1.5~4.0%, and Mo.
0.5 to 6% Cr, 4% or less Cr, the balance being Fe, and is characterized by being integrally cast with a sintered alloy chip having a density of 6.8 g/cm 3 or more and a hardness of H RC 30 or more. be.
以下、この発明を図面を参照して詳細に説明す
る。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
図面に示すロツカーアームの本体１はアルミニ
ウム合金で形成すると共に、該本体１の一端のパ
ツト部２を焼結合金製チツプを鋳ぐるみの方法に
より一体的に設けている。 The body 1 of the rocker arm shown in the drawings is made of an aluminum alloy, and a part 2 at one end of the body 1 is integrally provided with a sintered metal chip by casting.
上記パツト部２を形成する焼結合金は、C0.5
〜2.0％、Co1.5〜４％、Mo0.5〜６％、Cr4.0
％、P0〜2.0％、残部Feの化学成分からなる合金
粉末を、圧粉圧２〜６ｔ／cm2で圧粉成形し、非酸
化性雰囲気中で1000℃〜1200℃で10〜60分の間、
一部液相焼結法を用いて製造したものである。 The sintered alloy forming the above part 2 is C0.5
~2.0%, Co1.5~4%, Mo0.5~6%, Cr4.0
%, P0 to 2.0%, and the balance Fe is compacted at a compacting pressure of 2 to 6 t/cm 2 and heated at 1000°C to 1200°C for 10 to 60 minutes in a non-oxidizing atmosphere. while,
It was partially manufactured using a liquid phase sintering method.
上記化学成分の限定範囲を以下に詳述する。 The limited range of the above chemical components will be explained in detail below.
Ｃは前記(1)、(2)、(3)、(4)の特性を持たせる作
用、即ち、強度、密度、硬さを上げ、かつ、Ｐ、
Mr、Cr、Feと共に複合炭化合物を形成して耐摩
耗性を持たせる作用をし、かつ、Fe、Ｐ、Moと
共に液相を晶出させる作用をする。Ｃが0.5％未
満では上記作用効果が少なく、2.0％を越えると
液相が多く出すぎて変形が大きくなる。尚、特に
0.8％〜1.6％が好ましい。 C has the effect of imparting the properties (1), (2), (3), and (4) above, that is, increases strength, density, and hardness, and P,
Together with Mr, Cr, and Fe, it forms a composite carbon compound that provides wear resistance, and together with Fe, P, and Mo, it serves to crystallize a liquid phase. If C is less than 0.5%, the above-mentioned effects will be small, and if it exceeds 2.0%, too much liquid phase will be produced and deformation will be large. In addition, especially
0.8% to 1.6% is preferred.
Coは、前記(1)の強度を上げる働きをし、第２
図に示す如く、1.5％未満及び4.0％を越えると抗
折力が60Kg／mm2以下となり、よつて1.5％〜4.０
％に限定される。 Co has the function of increasing the strength of (1) above, and the second
As shown in the figure, if it is less than 1.5% or more than 4.0%, the transverse rupture strength will be 60Kg/ mm2 or less, and therefore 1.5% to 4.0%.
limited to %.
Mrは、前記(1)、(2)、(3)、(4)、(5)の特性を付与
する作用と液相を晶出させる作用をする。0.5％
未満ではその効果が劣ると共に、6.0％を越える
とコストの割りに効果が少なく、よつて0.5％〜
6.％に限定される。 Mr has the function of imparting the properties (1), (2), (3), (4), and (5) above, and the function of crystallizing the liquid phase. 0.5%
If it is less than 6.0%, the effect will be inferior, and if it exceeds 6.0%, the effect will be small compared to the cost, and it will be 0.5% or more.
Limited to 6.%.
Crは前記(3)、(4)の特性を付与する作用をす
る。Crは複合炭化物の焼結時の分解を抑えると
共に、耐摩耗性を向上させるが、４％を越えると
コストの割にその効果が少ない。 Cr functions to impart the properties (3) and (4) above. Cr suppresses the decomposition of composite carbides during sintering and improves wear resistance, but if it exceeds 4%, the effect is small considering the cost.
Ｐは液相を晶出させるために必要であるが、製
造法として液相焼結法以外の方法を用いる時はＰ
は不要である。Ｐを２％以上とすると、靭性が低
下するため、０〜２％に限定される。 P is necessary to crystallize the liquid phase, but when using a manufacturing method other than liquid phase sintering, P
is not necessary. If P is 2% or more, the toughness decreases, so it is limited to 0 to 2%.
上記の焼結合金は、抗折力が60Kg／mm2以上、密
度が6.8ｇ／cm3以上、硬度がＨRC30以上であり、
かつ、炭化物、複合炭化物が多く折出して耐摩耗
性が大であり、しかも、焼結時の変時が少なく、
上記パツト材に要求される特性を備えている。 The above sintered alloy has a transverse rupture strength of 60 kg/mm 2 or more, a density of 6.8 g/cm 3 or more, and a hardness of H RC 30 or more,
In addition, a large amount of carbides and composite carbides are precipitated, resulting in high wear resistance, and less time change during sintering.
It has the characteristics required for the above-mentioned patch material.
該特性を有する焼結合金により形成したパツト
部は、その厚さｔを２mm以下としている。 The pad portion made of a sintered alloy having the above characteristics has a thickness t of 2 mm or less.
上記の如く、この発明に係るロツカーアーム
は、ロツカーアーム本体１をアルミニウム合金製
とし、パツト部２を上記焼結合金製とし、該パツ
ト部２の厚さを２mm以下と薄くしているため、ロ
ツカーアームは非常に軽量となり、バウンシング
限界を向上できると共に、パツト部２の耐衝撃摩
耗性及び抗折力が向上する。かつ、パツト部２を
形成する焼結合金は、単純な工程で安価に製造で
きる効果を有する。 As mentioned above, in the rocker arm according to the present invention, the rocker arm main body 1 is made of aluminum alloy, the part part 2 is made of the above-mentioned sintered alloy, and the thickness of the part part 2 is as thin as 2 mm or less. It is extremely lightweight, the bouncing limit can be improved, and the impact abrasion resistance and transverse rupture strength of the pad portion 2 are improved. Moreover, the sintered alloy forming the pad portion 2 has the advantage that it can be manufactured at low cost through simple steps.
実施例
C1.22％、Co3％、Mo3.5％、Cr0.9％、残部Fe
からなるように合金粉末を配合混合し、かつ、潤
滑材としてステアリン酸亜鉛を１％混合し、該混
合粉末を3t／cm2の圧縮圧力で圧粉成形し、1150℃
×20分間、H2ガス中にて焼結してパツト材とな
る焼結合金を製造した。該焼結合金の抗折力は78
〜82Kg／mm2、硬さはＨRC50〜54、密度は7.35〜
7.45ｇ／cm3である。該焼結合金で第３図に示す如
き、パツト部の厚さｔが２mm、巾Ｗが18mmの焼結
合金製チツプ３を形成し、アルミニウム合金製ロ
ツカーアーム本体と鋳ぐるみ一体としてロツカー
アームを形成した。Example C1.22%, Co3%, Mo3.5%, Cr0.9%, balance Fe
The mixed powder was mixed with 1% zinc stearate as a lubricant, and the mixed powder was compacted at a compression pressure of 3t/cm 2 and heated at 1150°C.
A sintered alloy to be used as a part material was produced by sintering in H 2 gas for 20 minutes. The transverse rupture strength of the sintered alloy is 78
~82Kg/ mm2 , hardness HRC 50~54, density 7.35~
It is 7.45g/ cm3 . The sintered alloy was used to form a sintered alloy chip 3, as shown in FIG. 3, with a part having a thickness t of 2 mm and a width W of 18 mm, and a rocker arm was formed integrally with the aluminum alloy rocker arm body and the casting. .
上記ロツカーアームを1300c.c.のエンジンの動弁
機構に装着し、5500r.p.m.のエンジン回転数で
150時間運転し、パツト部の摩耗をテストした。
その際、摺動するカムの材質はFCH−１で摺動
面をチル化してるものを用いた。上記と同一の条
件で、従来の摺動部をチル化している鋳鉄ロツカ
ーアームを用いて摩耗テストを行つた。その結果
は、第４図のグラフに示す如く、本発明実施例の
耐耗量は２μであるに対し、従来例では６μであ
り、本発明のロツカーアームは耐摩耗性に優れて
いる。 Attach the above Rotsuker arm to the valve train of a 1300 c.c. engine, and at an engine speed of 5500 r.pm.
It was operated for 150 hours and the wear of the parts was tested.
At that time, the material of the sliding cam used was FCH-1 with a chilled sliding surface. A wear test was conducted under the same conditions as above using a conventional cast iron rocker arm with chilled sliding parts. As a result, as shown in the graph of FIG. 4, the wear resistance of the embodiment of the present invention is 2μ, while that of the conventional example is 6μ, indicating that the rocker arm of the present invention has excellent wear resistance.
第１図はこの発明に係るロツカーアームの正面
図、第２図はCoの添加量と抗折力との相関関係
を示すグラフ、第３図はこの発明に係る一実施例
の焼結合金製チツプを示す正面図、第４図はこの
発明の実施例と従来例との摩耗量を比較するグラ
フである。
１……ロツカーアーム本体、２……パツト部、
３……焼結合金製チツプ。
FIG. 1 is a front view of a rocker arm according to the present invention, FIG. 2 is a graph showing the correlation between the amount of Co added and transverse rupture strength, and FIG. 3 is a sintered alloy chip according to an embodiment of the present invention. FIG. 4 is a graph comparing the amount of wear between the embodiment of the present invention and the conventional example. 1...Rotsuker arm body, 2...Putt part,
3... Chip made of sintered metal.
Claims (1)
ームにおいて、ロツカーアーム本体がアルミニウ
ム合金製であり、パツト部にC0.5〜2.0％（重量
％、以下同じ）、Co1.5〜4.0％、Mo0.5〜６％、
Cr4％以下、残部がFeの成分からなり、密度が
6.8ｇ／cm3以上、硬度がＨRC30以上の焼結合金製
チツプを鋳ぐるみ一体としてなることを特徴とす
る複合材製ロツカーアーム。 ２ 特許請求の範囲１記載の焼結合金製チツプの
厚さが、2.0mm以下であることを特徴とする複合
材製ロツカーアーム。[Scope of Claims] 1. In a rocker arm used in a valve train of an internal combustion engine, the rocker arm main body is made of aluminum alloy, and the parts contain 0.5 to 2.0% C (weight %, same hereinafter) and 1.5 to 4.0% Co. %, Mo0.5~6%,
Consisting of Cr4% or less, the balance being Fe, and the density is
A rocker arm made of composite material, characterized by being integrally cast with a sintered metal chip having a hardness of 6.8 g/cm 3 or more and a hardness of H RC 30 or more. 2. A rocker arm made of a composite material, characterized in that the thickness of the sintered metal chip according to claim 1 is 2.0 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13915278A JPS5566606A (en) | 1978-11-10 | 1978-11-10 | Rocker arm made of composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13915278A JPS5566606A (en) | 1978-11-10 | 1978-11-10 | Rocker arm made of composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5566606A JPS5566606A (en) | 1980-05-20 |
| JPS621081B2 true JPS621081B2 (en) | 1987-01-12 |
Family
ID=15238767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13915278A Granted JPS5566606A (en) | 1978-11-10 | 1978-11-10 | Rocker arm made of composite material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5566606A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5797007A (en) * | 1980-11-19 | 1982-06-16 | Toyota Motor Corp | Valve rocker arm |
| JP2522238B2 (en) * | 1984-02-13 | 1996-08-07 | 三菱自動車工業株式会社 | Locker arm and method for producing the same |
| JPS60170006U (en) * | 1984-04-18 | 1985-11-11 | 三菱自動車工業株式会社 | Ceramic chip for rocker arm |
| JPS6138257A (en) * | 1984-07-31 | 1986-02-24 | Mitsubishi Metal Corp | Rocker arm |
| DE19641943B4 (en) * | 1996-10-11 | 2008-04-10 | Sig Corpoplast Gmbh & Co. Kg | Device for holding preforms and blow molding machine for forming containers |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50119706A (en) * | 1974-03-07 | 1975-09-19 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5298014U (en) * | 1976-01-22 | 1977-07-23 |
-
1978
- 1978-11-10 JP JP13915278A patent/JPS5566606A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50119706A (en) * | 1974-03-07 | 1975-09-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5566606A (en) | 1980-05-20 |
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