JPH0122234B2 - - Google Patents
Info
- Publication number
- JPH0122234B2 JPH0122234B2 JP57208470A JP20847082A JPH0122234B2 JP H0122234 B2 JPH0122234 B2 JP H0122234B2 JP 57208470 A JP57208470 A JP 57208470A JP 20847082 A JP20847082 A JP 20847082A JP H0122234 B2 JPH0122234 B2 JP H0122234B2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- cam
- metal
- shaft
- engagement
- 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
Landscapes
- Gears, Cams (AREA)
- Ceramic Products (AREA)
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、金属とセラミツクの係合体に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a metal-ceramic engagement body.
（発明の技術的背景及びその問題点）
例えば自動車用エンジン等の内燃機関のカムシ
ヤフトは、金属の鋳造や鍛造の方法によりカム
部、ジヤーナル部、軸体等を一体に成形し、これ
に機械加工による仕上げを施こすことにより製造
されていた。しかしながらこの方法では機械加工
に要する工数がかなり大きいため、近年、カム部
等を別個に製造し、これらを軸体に組み合わせて
カムシヤフトを構成する、いわゆる分割カムシヤ
フト方式が提案されている。(Technical background of the invention and its problems) For example, a camshaft for an internal combustion engine such as an automobile engine is manufactured by integrally molding a cam part, journal part, shaft body, etc. by metal casting or forging methods, and then machining the cam part, journal part, shaft body, etc. It was manufactured by applying a finishing process. However, this method requires a considerable number of man-hours for machining, so in recent years, a so-called split camshaft method has been proposed in which the cam parts and the like are manufactured separately and assembled into a shaft to form a camshaft.
さらに、最近の内燃機関の高速、高出力化の傾
向に合わせ、耐熱性、耐摩耗性等に優れ、熱膨張
率の極めて小さいセラミツク焼結体でカム部を構
成したものが提案されている。このようなセラミ
ツク製のカムは従来軸に焼ばめで取付けられてい
る。しかしながら、のような構造の場合、温度上
昇による熱膨張によつてカムの軸貫通内壁面に応
力が集中しやすく亀裂が生じるという欠点があつ
た。 Furthermore, in accordance with the recent trend toward higher speeds and higher outputs of internal combustion engines, it has been proposed that the cam portion is made of a ceramic sintered body that has excellent heat resistance, wear resistance, etc., and has an extremely small coefficient of thermal expansion. Such a ceramic cam is conventionally attached to the shaft by a shrink fit. However, such a structure has the drawback that stress tends to concentrate on the inner wall surface of the shaft passing through the cam due to thermal expansion due to temperature rise, resulting in cracks.
（発明の目的）
本発明は、セラミツクにかかる応力集中をさけ
損傷の少ない金属とセラミツクの係合体を提供す
るものである。(Objective of the Invention) The present invention provides a metal-ceramic engagement body that avoids stress concentration on the ceramic and causes less damage.
（発明の概要）
本発明の係合体は金属でなる部材とセラミツク
でなる部材を、断面が円形である係合部材（円柱
体、球体）で係合してなることを特徴とする。(Summary of the Invention) The engaging body of the present invention is characterized in that it is formed by engaging a metal member and a ceramic member with an engaging member (cylindrical body, spherical body) having a circular cross section.
実用的な適用例としては、金属でなる軸体にセ
ラミツクのカムを、断面円形のキーで係合する係
合体が挙げられる。この場合、セラミツクに形成
される孔は軸が貫通する孔とキーが貫通する孔で
あつていずれも円形形状で構成される。円形形状
は円周方向に放射状に応力を分散させるため応力
集中を避け得る。 An example of a practical application is an engagement body in which a ceramic cam is engaged with a metal shaft using a key having a circular cross section. In this case, the holes formed in the ceramic are a hole through which the shaft passes and a hole through which the key passes, and both have a circular shape. The circular shape disperses stress radially in the circumferential direction, thereby avoiding stress concentration.
本発明においてカム本体を構成するセラミツク
焼結体としては、Si3N4、AlN、TiN、ZrNのよ
うな窒化物、Si2ON2、SiAlONのような酸窒化
物、SiC、B4C、TiC、ZrCのような炭化物、
Al2O3、ZrO2、MgAl2O4のような酸化物、Si3N4
−SiCのような炭窒化物等のセラミツク焼結体が
ある。 In the present invention, the ceramic sintered body constituting the cam body includes nitrides such as Si 3 N 4 , AlN, TiN, and ZrN, oxynitrides such as Si 2 ON 2 and SiAlON, SiC, B 4 C, carbides such as TiC, ZrC,
Oxides like Al 2 O 3 , ZrO 2 , MgAl 2 O 4 , Si 3 N 4
-There are ceramic sintered bodies such as carbonitrides such as SiC.
これらのセラミツク焼結体で本発明のセラミツ
ク体を製造するには、セラミツク粉末を、例えば
(イ)普通焼結（炉焼結）、(ロ)加圧焼結、(ハ)反応結合
焼結等の方法で所定形状に成型した後、金属体と
の係合部分の加工を施こす。 In order to manufacture the ceramic body of the present invention using these ceramic sintered bodies, ceramic powder is mixed with, for example,
After forming into a predetermined shape using methods such as (a) normal sintering (furnace sintering), (b) pressure sintering, and (c) reaction bond sintering, the parts that engage with the metal body are processed. .
（発明の実施例）
次に図面の実施例に基づいて本発明を説明す
る。(Embodiments of the Invention) Next, the present invention will be described based on embodiments of the drawings.
第１図および第２図は本発明の一実施例を示す
カムシヤフトのそれぞれ横断面図および縦断面図
であり、図において１はセラミツク焼結体から構
成されたカム本体２はその貫通孔に嵌合された金
属製の軸体である。カムと軸体は、断面円形の例
えば金属製のキー３で係合されている。なお、
４，５はカム本体１の貫通孔３の開口端およびカ
ムプロフイルム面６の周縁端に設けられた曲面状
の面取り部である。 1 and 2 are a cross-sectional view and a vertical cross-sectional view, respectively, of a camshaft showing an embodiment of the present invention. In the figures, 1 is a cam body 2 made of a ceramic sintered body, and a cam body 2 is fitted into a through hole thereof. It is a combined metal shaft. The cam and the shaft are engaged with a key 3 made of metal, for example, and having a circular cross section. In addition,
Reference numerals 4 and 5 designate curved chamfered portions provided at the open end of the through hole 3 of the cam body 1 and at the peripheral edge of the cam profile surface 6.
このように構成された本発明のカムは、カム本
体がセラミツク焼結体で構成されているので、軽
量で耐熱性や高温下での耐摩耗性に優れ、内燃機
関に装着した場合、その高速化および高出力化を
達成することができる。 The cam of the present invention constructed in this way has a cam body made of a ceramic sintered body, so it is lightweight and has excellent heat resistance and wear resistance under high temperatures, and when installed in an internal combustion engine, it can be used at high speeds. It is possible to achieve high power output.
（発明の効果）
本発明の係合体では、セラミツク体と金属体
は、焼ばめよりゆるやかなはめ合いで係合できる
ため熱応力による亀裂の発生はほとんどなくな
る。また係合体は断面円形であつて、セラミツク
を加工する際にも応力集中が最も少ない形状であ
るため加工も容易である。(Effects of the Invention) In the engaging body of the present invention, the ceramic body and the metal body can be engaged with each other with a fit that is looser than that of a shrink fit, so that the occurrence of cracks due to thermal stress is almost eliminated. Further, the engaging body has a circular cross section, which is a shape that minimizes stress concentration even when processing ceramic, and is therefore easy to process.
なお軸体或いはタペツトと接触し、その応力が
集中するカム本体の内側周縁端或いは外周縁端を
曲面状に面取り加工することにより、これらの部
分から破壊が生じることがなく、寿命が飛躍的に
向上するという効果も奏する。 Furthermore, by chamfering the inner or outer peripheral edge of the cam body into a curved shape, which contacts the shaft body or tappet and where stress is concentrated, breakage does not occur from these parts, dramatically extending the life of the cam body. It also has the effect of improving.
第１図は本発明の一実施例のカムシヤフトのカ
ム部を示す横断面図であり、第２図はその縦断面
図である。
１……セラミツク焼結体製のカム本体、２……
金属製の軸体、３……キー、４，５……曲面状の
面取り部、６……カムプロフイル面。
FIG. 1 is a cross-sectional view showing a cam portion of a camshaft according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view thereof. 1... Cam body made of ceramic sintered body, 2...
Metal shaft body, 3... key, 4, 5... curved chamfered portion, 6... cam profile surface.
Claims (1)
体を、断面が円形である係合部材を介して係合
し、挿着してなることを特徴とする金属とセラミ
ツクの係合体。 ２ 環状体は、外形が非円形であるカムである特
許請求の範囲第１項に記載の金属とセラミツクの
係合体。 ３ 係合部材は、軸体の表面に長手方向に位置す
るキーである特許請求の範囲第１項に記載の金属
とセラミツクの係合体。 ４ 環状体が有するエツヂ部は局面状に面取り加
工されている特許請求の範囲第１項に記載の金属
とセラミツクの係合体。[Scope of Claims] 1. A metal shaft body characterized in that a ceramic annular body is engaged with and inserted into the outer circumference of a metal shaft body through an engaging member having a circular cross section. Ceramic engagement body. 2. The metal-ceramic engagement body according to claim 1, wherein the annular body is a cam having a non-circular outer shape. 3. The metal-ceramic engagement body according to claim 1, wherein the engagement member is a key located longitudinally on the surface of the shaft body. 4. The metal-ceramic engagement body according to claim 1, wherein the edge portion of the annular body is chamfered into a curved shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20847082A JPS59102878A (en) | 1982-11-30 | 1982-11-30 | Metal ceramic bonded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20847082A JPS59102878A (en) | 1982-11-30 | 1982-11-30 | Metal ceramic bonded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59102878A JPS59102878A (en) | 1984-06-14 |
| JPH0122234B2 true JPH0122234B2 (en) | 1989-04-25 |
Family
ID=16556705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20847082A Granted JPS59102878A (en) | 1982-11-30 | 1982-11-30 | Metal ceramic bonded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59102878A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5918201A (en) * | 1982-07-23 | 1984-01-30 | Nissan Motor Co Ltd | Fitting structure of ceramics turbine |
-
1982
- 1982-11-30 JP JP20847082A patent/JPS59102878A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59102878A (en) | 1984-06-14 |
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