JPH04134109A - Ceramic engine valve - Google Patents
Ceramic engine valveInfo
- Publication number
- JPH04134109A JPH04134109A JP25427190A JP25427190A JPH04134109A JP H04134109 A JPH04134109 A JP H04134109A JP 25427190 A JP25427190 A JP 25427190A JP 25427190 A JP25427190 A JP 25427190A JP H04134109 A JPH04134109 A JP H04134109A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve guide
- stem
- engine valve
- engine
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims description 16
- 238000003754 machining Methods 0.000 abstract description 7
- 229910052581 Si3N4 Inorganic materials 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract description 2
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 2
- 238000005498 polishing Methods 0.000 abstract description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910003465 moissanite Inorganic materials 0.000 abstract 1
- 229910010271 silicon carbide Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 3
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、内燃機関用のセラミックス製エンジンバルブ
に係り、特に、ステム部におけるバルブガイドに嵌挿さ
れる部分の上下部を、大径としたエンジンバルブに関す
る。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a ceramic engine valve for an internal combustion engine, and in particular, the upper and lower portions of the stem portion that are inserted into the valve guide have a large diameter. Regarding engine valves.
構造用セラミックスは、耐熱性や断熱性に優れるととも
に、低比重で、かつ高耐摩耗性を有していることなどか
ら、過給機を塔載したり、圧縮比を高めたりした燃焼温
度の高い高出力型エンジンの吸排気バルブ、特に高い耐
熱性等の要求される排気バルブ用として期待されている
。Structural ceramics have excellent heat resistance and insulation properties, low specific gravity, and high wear resistance, so they can be used to lower combustion temperatures by installing a turbocharger or increasing the compression ratio. It is expected to be used in intake and exhaust valves for high-output engines, especially exhaust valves that require high heat resistance.
第５図は、従来のセラミックス製エンジンバルブ（０１
）を示し、きのこ状に拡径する傘部（Ｏｌｅ）と、それ
となだらかに連続するストレート状のステム部（Ｏｌｂ
）とからなり、ステム部（Ｏｌｂ）には、軸端部に形成
されたコツタ溝（ＯＩＣ）を除いて、研削等の仕上げ加
工が施されている６
〔発明が解決しようとする課題〕
上述のようなセラミックス製のエンジンバルブは、通常
、粉末状のセラミックス原料に、適当なバインダーや溶
媒等を加え、金型等により、完成品に近いバルブの原形
品に成形したのち焼結し、最後に、弁フエース部（Ｏｌ
ｄ）やステム部（Ｏｌｂ）等に研削等の仕上げ加工を施
して、製品化される。Figure 5 shows a conventional ceramic engine valve (01
), the umbrella part (Ole) expands in diameter like a mushroom, and the straight stem part (Olb
), and the stem portion (Olb) is subjected to finishing processing such as grinding, except for the cotter groove (OIC) formed at the shaft end.6 [Problems to be Solved by the Invention] As mentioned above. Ceramic engine valves, such as the , the valve face part (Ol
d), the stem part (Olb), etc. are subjected to finishing processing such as grinding, and then manufactured into a product.
弁の開閉がロッカーアームより行われるエンジンバルブ
は、ステム部（Ｏｌｂ）の中間部が、バルブガイド（０
２）により案内されて摺動するようになっているため、
従来のセラミックス製エンジンバルブ（０１）において
は、通常の鋼製のエンジンバルブと同様に、ステム部（
Ｏｌｂ）全体に仕上げ加工を施しているのが一般的であ
る。In engine valves whose valves are opened and closed by a rocker arm, the middle part of the stem part (Olb) is connected to the valve guide (Olb).
2) so that it slides while being guided by
In the conventional ceramic engine valve (01), the stem part (
It is common for the entire part to be finished.
セラミックス製品は、非常に硬くて機械加工性が悪いた
め、研削等の加工部分を最小限とすることが望ましく、
上述したエンジンバルブのように、バルブガイド（０２
）に嵌挿されて摺動する部分以外のステム部（Ｏｌｂ）
をも研削することは、単に加工時間の浪費につながるば
かりでなく、高価なＣＢＮ砥石やダイヤモンド砥石等の
寿命を低下させて、交換時期を早めたり、ステム部（Ｏ
ｌｂ）の全長に合った幅広かつ大型の砥石を使用しなけ
ればならないため、製造コストが上昇して、製品単価を
引き上げる結果となる。Ceramic products are extremely hard and have poor machinability, so it is desirable to minimize processing such as grinding.
Like the engine valve mentioned above, the valve guide (02
) The stem part (Olb) other than the part that slides when inserted into the
Grinding not only leads to wasted machining time, but also shortens the life of expensive CBN grinding wheels and diamond grinding wheels, which may lead to earlier replacement times and damage to the stem (O
Since it is necessary to use a wide and large grindstone that matches the total length of the grinding wheel, the manufacturing cost increases and the unit price of the product increases.
本発明は、上記課題に鑑みてなされたもので、その目的
とするところは、ステム部の機械加工部分を最小限とし
て、安価なセラミックス製エンジンバルブを提供するこ
とにある。The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an inexpensive ceramic engine valve that minimizes the machining portion of the stem portion.
上記目的を達成するため、本発明はステム部（１ａ）に
おけるバルブガイド（３）に嵌挿される部分の上下部に
、その中間部よりも大径で、かつ前記バルブガイド（３
）の内径と摺接する所要長さの大径部（１１）（１２）
を形成するとともに、大径部（１１）（１２）の周面に
仕上げ加工を施したことを特徴としている。In order to achieve the above object, the present invention provides that the upper and lower portions of the stem portion (1a) to be fitted into the valve guide (3) have a larger diameter than the intermediate portion, and the valve guide (3) has a larger diameter than the intermediate portion thereof.
) Large diameter portion (11) (12) of the required length that makes sliding contact with the inner diameter of the
It is characterized in that it is formed and the peripheral surfaces of the large diameter portions (11) and (12) are finished.
ステム部（１ａ）におけるバルブガイド（３）と摺接す
る上下の大径部（１１）（１２）のみに、機械加工を施
せばよいので、加工時間が短縮され、かつ工具の寿命も
延びる。Since only the upper and lower large diameter portions (11) and (12) of the stem portion (1a) that come into sliding contact with the valve guide (3) need be machined, the machining time is shortened and the life of the tool is extended.
以下、本発明の実施例を、図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は、本発明のセラミックス製のエンジンバルブ（
１）を、エンジンに組付けた状態を略示するものである
。Figure 1 shows the ceramic engine valve of the present invention (
1) is schematically shown assembled into an engine.
図中（２）はシリンダヘッド、（３）は、シリンダヘッ
ト（２）に圧入されたバルブガイド、（４）は、バルブ
ガイド（３）の上端に嵌合された、オイル下がり防止用
のりツブシールである。In the figure, (2) is the cylinder head, (3) is the valve guide press-fitted into the cylinder head (2), and (4) is the glue lug seal fitted to the upper end of the valve guide (3) to prevent oil from dripping. It is.
エンジンバルブ（１）は、そのステム部（ｌａ）を、バ
ルブガイド（３）に摺動自在として嵌挿することにより
保持され、かつステム部（１ａ）の上端部にコツタ（図
示略）をもって止着されたスプリングリテーナ（５）と
、シリンダヘッド（２）との間に縮設したバルブスプリ
ング（６）により、常時上向きとして付勢されている。The engine valve (1) is held by fitting its stem portion (la) into the valve guide (3) so as to be able to slide freely, and the engine valve (1) is held by fitting the stem portion (la) into the valve guide (3) so as to be slidable therein, and is stopped by a clasp (not shown) at the upper end of the stem portion (1a). The valve spring (6) is compressed between the attached spring retainer (5) and the cylinder head (2), and is constantly biased upward.
これにより、エンジンバルブ（１）の非作動時において
、傘部（１ｂ）に形成した弁フエース部（ＩＣ）と、吸
又は排気ポート（７）の開口部に嵌合したバルブシート
（８）とは、密に当接している。As a result, when the engine valve (1) is not in operation, the valve face portion (IC) formed on the umbrella portion (1b) and the valve seat (8) fitted in the opening of the intake or exhaust port (7) are in close contact.
（９）は、はぼ中間部がロッカーシャフト（図示略）に
枢支されたロッカーアームで、下方に位置する回転カム
（図示略）に摺接することにより上下に揺動し、先端部
に螺挿したアジヤスティングスクリュウ（１０）の下端
が、エンジンバルブ（１）の上端を押圧することにより
、開閉させられる。(9) is a rocker arm whose middle part is pivotally supported by a rocker shaft (not shown), which swings up and down by slidingly contacting a rotating cam (not shown) located below, and which has a threaded end. The lower end of the inserted adjusting screw (10) is opened and closed by pressing the upper end of the engine valve (1).
エンジンバルブ（１）は、例えばＡｌ２Ｏ，、ＺｒＯ，
、ＳｉＣ，Ｓｉ３Ｎ４等のセラミックス材料により、ス
テム部（１ａ）におけるバルブガイド（３）に嵌挿され
る部分の上下部、すなわち、バルブ作動中の曲げ応力や
振動等により、最も摩耗が発生し易い部分に、バルブの
リフト量を含む所要長さの大径部（１１）（１２）が形
成され、かつ中間部にバルブガイド（３）と摺接しない
小径部（１３）が形成されるように型成形したのち焼結
され、さらに、大径部（１１）（１２）の表面にのみ、
研削盤等により研削（研磨）加工を施して構成されてい
る。The engine valve (1) is made of, for example, Al2O, ZrO,
, SiC, Si3N4, etc. are made of ceramic materials such as the upper and lower parts of the stem part (1a) that are fitted into the valve guide (3), that is, the parts where wear is most likely to occur due to bending stress, vibration, etc. during valve operation. The mold is formed so that large diameter portions (11) and (12) with a required length that includes the lift amount of the valve are formed, and a small diameter portion (13) that does not come into sliding contact with the valve guide (3) is formed in the middle portion. After molding, it is sintered, and further, only on the surfaces of the large diameter parts (11) and (12),
It is constructed by performing a grinding (polishing) process using a grinder or the like.
この実施例のエンジンバルブ（１）のように、ステム部
（１ａ）における中間部の上下部のみをバルブガイド（
３）と摺接しうるようにし、かつその部分にのみ機械加
工を施すようにすると、エンジンバルブ（１）とバルブ
ガイド（３）間の摺動摩擦抵抗を低減しうる利点がある
ばかりでなく、加工時間が、従来のセラミックス製エン
ジンバルブに比べて著しく短縮され、しかも、研削砥石
等の小型軽量化が図れる。Like the engine valve (1) of this embodiment, only the upper and lower portions of the intermediate portion of the stem portion (1a) are connected to the valve guide (
3), and machining only that part, not only has the advantage of reducing the sliding friction resistance between the engine valve (1) and the valve guide (3), but also reduces machining. The time is significantly reduced compared to conventional ceramic engine valves, and grinding wheels and the like can be made smaller and lighter.
第２図〜第４図は、本発明のセラミックス製エンジンバ
ルブの他の実施例を示し、第２図のものは、上記下部側
の大径部（１２）を、傘部（１ｂ）まで延長させて機械
加工した例を、第３図のものは、反対に上部側の大径部
（１１）を軸端側まで延長させて機械加工した例を、第
４図のものは、上下の大径部（１１） （１２）を、そ
れぞれ軸端及び傘部（１ｂ）側まで延長させて機械加工
した例を示している。Figures 2 to 4 show other embodiments of the ceramic engine valve of the present invention, and the one in Figure 2 extends the large diameter part (12) on the lower side to the umbrella part (1b). The one in Fig. 3 is an example in which the large diameter part (11) on the upper side was machined by extending it to the shaft end, and the one in Fig. 4 is an example in which the large diameter part (11) on the upper side was machined by extending it to the shaft end. An example is shown in which the diameter portions (11) and (12) are extended and machined to the shaft end and the umbrella portion (1b) side, respectively.
これら各実施例のものにおいても、上述の第１図に示す
エンジンバルブ（１）と同様の作用効果を奏することが
できる。In each of these embodiments, the same effects as the engine valve (1) shown in FIG. 1 described above can be achieved.
本発明によれば、ステム部（１ａ）の機械加工部分が、
従来のセラミックス製エンジンバルブに比して著しく減
少するので、加工時間が短縮され、生産性が高まる。According to the invention, the machined portion of the stem portion (1a) is
This is significantly reduced compared to conventional ceramic engine valves, reducing machining time and increasing productivity.
また、研削砥石等の寿命が延びるとともに、その小型化
が図れるので、製造コストは大幅に低減する。In addition, the life of the grinding wheel etc. is extended and the size thereof can be reduced, so that the manufacturing cost is significantly reduced.
第１図は、本発明の一実施例のセラミックス製エンジン
バルブを、エンジンに組付けた状態を示す要部の縦断面
図、
第２図〜第４図は、本発明の他の実施例のセラミックス
製エンジンバルブを示す正面図、第５図は、従来のセラ
ミックス製エンジンバルブの正面図である。
（１）セラミックス製エンジンバルブ
（１ａ）ステム部 （１ｂ）傘部（ｌｃ）
弁フエース部（２）シリンダヘット（３）バルブガイド
（４）リップシール（５）スプリングリテーナ
（６）バルブスプリング（７）ポート
（８）バルブシート（９）ロッカーアーム
（１０）アジヤスティングスクリュウ
（１１） （１２）大径部 （１３）小径部第
３図
第４図FIG. 1 is a longitudinal cross-sectional view of the main parts of a ceramic engine valve according to an embodiment of the present invention, showing a state in which it is assembled into an engine. FIGS. 2 to 4 are diagrams showing other embodiments of the present invention. FIG. 5 is a front view of a conventional ceramic engine valve. (1) Ceramic engine valve (1a) Stem part (1b) Umbrella part (lc)
Valve face part (2) Cylinder head (3) Valve guide (4) Lip seal (5) Spring retainer (6) Valve spring (7) Port
(8) Valve seat (9) Rocker arm (10) Adjusting screw (11) (12) Large diameter section (13) Small diameter section Fig. 3 Fig. 4
Claims (1)
下部に、その中間部よりも大径で、かつ前記バルブガイ
ドの内径と摺接する所要長さの大径部を形成するととも
に、大径部の周面に仕上げ加工を施したことを特徴とす
るセラミックス製エンジンバルブ。At the upper and lower portions of the stem portion that are fitted into the valve guide, large diameter portions are formed that have a larger diameter than the intermediate portion and have a required length to make sliding contact with the inner diameter of the valve guide. A ceramic engine valve that features a finished surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25427190A JPH04134109A (en) | 1990-09-26 | 1990-09-26 | Ceramic engine valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25427190A JPH04134109A (en) | 1990-09-26 | 1990-09-26 | Ceramic engine valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04134109A true JPH04134109A (en) | 1992-05-08 |
Family
ID=17262655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25427190A Pending JPH04134109A (en) | 1990-09-26 | 1990-09-26 | Ceramic engine valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04134109A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372103A (en) * | 1994-04-25 | 1994-12-13 | Caterpillar Inc. | Method of mounting a ceramic valve guide assembly |
| US7484492B2 (en) * | 2006-07-06 | 2009-02-03 | Yamaha Hatsudoki Kabushiki Kaisha | Four-cycle internal combustion engine and vehicle |
| JP2017082716A (en) * | 2015-10-29 | 2017-05-18 | トヨタ自動車株式会社 | Dynamic valve device of internal combustion engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6310207B2 (en) * | 1985-07-17 | 1988-03-04 | Kobe Seikosho Kk |
-
1990
- 1990-09-26 JP JP25427190A patent/JPH04134109A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6310207B2 (en) * | 1985-07-17 | 1988-03-04 | Kobe Seikosho Kk |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372103A (en) * | 1994-04-25 | 1994-12-13 | Caterpillar Inc. | Method of mounting a ceramic valve guide assembly |
| US7484492B2 (en) * | 2006-07-06 | 2009-02-03 | Yamaha Hatsudoki Kabushiki Kaisha | Four-cycle internal combustion engine and vehicle |
| JP2017082716A (en) * | 2015-10-29 | 2017-05-18 | トヨタ自動車株式会社 | Dynamic valve device of internal combustion engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU603307B2 (en) | Hydraulic lash-adjuster and bridge assembly | |
| CN102418573A (en) | Valve lifter for internal combustion engine | |
| JP2551619B2 (en) | Ceramic sliding member | |
| US5181691A (en) | Mechanical part made of ceramics | |
| JPH04134109A (en) | Ceramic engine valve | |
| JPH11303709A (en) | Fuel injection pump | |
| EP2246533B1 (en) | Sliding member, and method for treating surface of the sliding member | |
| US5372099A (en) | Ceramic adjusting shim | |
| JPH02304228A (en) | Spring seat member for coil spring | |
| EP0682171B1 (en) | Valve crosshead assembly with wear-reducing contact pad | |
| JPS59232760A (en) | Grinding method of cam for internal-combustion engine | |
| JP2004346821A (en) | Arm type valve gear | |
| US2816532A (en) | Cam | |
| JP5231980B2 (en) | Rocker arm and its polishing method | |
| JP4552292B2 (en) | Barrel polishing method and barrel polishing method for follower integrated valve lifter | |
| JPH08226311A (en) | Ceramic adjusting shim | |
| JPH02223613A (en) | Valve system in internal combustion engine | |
| JPH01117905A (en) | Poppet valve constitution | |
| GB564507A (en) | Improvements in or relating to valve tappet constructions | |
| JP2724516B2 (en) | Tappet manufacturing method | |
| CN108150239A (en) | For the finger follower assembly of the valve actuating mechanism of internal combustion engine | |
| CN115667677B (en) | Engine valve and method for manufacturing same | |
| JPS62253908A (en) | Valve lifter for overhead valve type internal combustion engine | |
| US5572963A (en) | Hydraulic tappet | |
| JP2531654B2 (en) | Sliding contact part and its manufacturing method |