JPH0637507U - Intake and exhaust valves for internal combustion engines - Google Patents
Intake and exhaust valves for internal combustion enginesInfo
- Publication number
- JPH0637507U JPH0637507U JP7170392U JP7170392U JPH0637507U JP H0637507 U JPH0637507 U JP H0637507U JP 7170392 U JP7170392 U JP 7170392U JP 7170392 U JP7170392 U JP 7170392U JP H0637507 U JPH0637507 U JP H0637507U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- intake
- guide
- valve stem
- stem
- 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
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
(57)【要約】
【目的】 バルブステムの傾斜を低減して吸排気バルブ
及びバルブシートの偏摩耗を防ぐ。
【構成】 バルブステム３を案内するバルブガイド４を
シリンダヘッド１に収装する吸排気弁において、バルブ
ガイド３のシリンダヘッド１の基準面１Ａからの突出量
Ｌ0をバルブステム３の外径Ｄの２倍以上に設定すると
ともに、バルブガイド４の全長Ｌ1をバルブステム３の
外径Ｄの６倍以上に設定する。
(57) [Summary] [Purpose] To reduce the inclination of the valve stem to prevent uneven wear of the intake and exhaust valves and the valve seat. [Structure] In an intake / exhaust valve in which a valve guide 4 for guiding a valve stem 3 is housed in a cylinder head 1, a protrusion amount L 0 of the valve guide 3 from a reference surface 1A of the cylinder head 1 is determined by an outer diameter D of the valve stem 3. 2 times or more, and the total length L 1 of the valve guide 4 is set to 6 times or more of the outer diameter D of the valve stem 3.
Description
【０００１】[0001]
本考案は、バルブ及びバルブシートの偏摩耗及び圧縮漏れを防ぐ内燃機関の吸 排気バルブの改良に関する。 The present invention relates to an improvement of an intake / exhaust valve of an internal combustion engine that prevents uneven wear and compression leakage of a valve and a valve seat.
【０００２】[0002]
エンジンの吸排気バルブは、使用の経過に伴ってバルブシートに偏摩耗を生じ て吸排気バルブの圧縮漏れの原因となることがあり、このバルブシートの偏摩耗 を防止する装置として特開昭５１−１０４１１４号公報に開示されるように、バ ルブ傘部のポート側に案内板を設け、ポート内に発生するスワールによって案内 板がバルブを回転させることによりバルブシートへの接触位置を徐々にずらすも のが知られている。 An intake / exhaust valve of an engine may cause uneven wear of the valve seat with use and may cause compression leakage of the intake / exhaust valve. As disclosed in Japanese Patent Laid-Open No. 104114, a guide plate is provided on the port side of the valve umbrella, and the swirl generated in the port causes the guide plate to rotate the valve, thereby gradually shifting the contact position with the valve seat. The thing is known.
【０００３】[0003]
しかしながら、バルブシートに生ずる偏摩耗は、図２に示すようにバルブステ ム３とバルブガイド４０との間のクリアランスＬCによってバルブステム３の軸 線がバルブガイド４０の軸線に対して傾斜θを生じてバルブ２０が均一にバルブ シート１０へ着座しないことも原因となっており、吸排気バルブに上記のような 案内板を設けただけではバルブシートの偏摩耗は防ぎきれないという問題が発生 した。However, the uneven wear caused in the valve seat causes the axis of the valve stem 3 to be inclined with respect to the axis of the valve guide 40 due to the clearance L C between the valve stem 3 and the valve guide 40 as shown in FIG. The valve 20 is not evenly seated on the valve seat 10, which causes a problem that uneven wear of the valve seat cannot be prevented only by providing the guide plate for the intake and exhaust valves.
【０００４】 そこで本考案は、バルブシートに生ずる偏摩耗を低減する内燃機関の吸排気バ ルブを提供することを目的とする。Therefore, an object of the present invention is to provide an intake / exhaust valve for an internal combustion engine that reduces uneven wear that occurs in the valve seat.
【０００５】[0005]
本考案は、カムに従動するバルブステムと、このバルブステムを案内するバル ブガイドをシリンダヘッドに収装する吸排気弁において、バルブガイドの前記シ リンダヘッドの基準面からの突出量を、前記バルブステムの外径の２倍以上に設 定するとともに、前記バルブガイドの全長をバルブステムの外径の６倍以上に設 定する。 According to the present invention, in a valve stem driven by a cam and an intake / exhaust valve in which a valve guide for guiding the valve stem is housed in a cylinder head, the protrusion amount of the valve guide from the reference surface of the cylinder head is determined by Set the outer diameter of the stem at least twice and set the total length of the valve guide at least six times the outer diameter of the valve stem.
【０００６】[0006]
カムに従動するバルブステムはバルブガイドに案内されて内部を摺動し、バル ブガイドのシリンダヘッドの基準面からの突出量がバルブステムの外径の２倍に 設されるとともに、バルブガイドの全長がバルブステムの外径の６倍以上となっ ているため、バルブステムの軸線がバルブガイドの軸線に対して傾斜しにくく、 この軸線に対する摺動運動が円滑に行われるためバルブ及びバルブシートへの偏 摩耗を軽減することができる。 The valve stem that follows the cam slides inside as it is guided by the valve guide, and the amount of protrusion of the valve guide from the reference surface of the cylinder head is set to twice the outer diameter of the valve stem and the total length of the valve guide. Is more than 6 times the outer diameter of the valve stem, the axis of the valve stem is less likely to incline with respect to the axis of the valve guide, and the sliding motion relative to this axis allows smooth movement to the valve and valve seat. Uneven wear can be reduced.
【０００７】[0007]
この実施例はエンジンの排気バルブに本考案を適用した例を示し、図１に示す ように、排気バルブ２はバルブステム３をシリンダヘッド１に設けられたバルブ ガイド４で上下方向に摺動自在に案内され、図示しないカムに従動してバルブシ ート１０と接離し、排気ポート１１を開閉する。 This embodiment shows an example in which the present invention is applied to an exhaust valve of an engine. As shown in FIG. 1, an exhaust valve 2 has a valve stem 3 slidable in a vertical direction by a valve guide 4 provided on a cylinder head 1. The exhaust port 11 is opened and closed by being driven by a cam (not shown) to come into contact with and separate from the valve sheet 10.
【０００８】 バルブガイド４はバルブステム３との間に所定の摺動隙間を備え、さらにシリ ンダヘッド１の上面である基準面１Ａからの突出高さＬ0、バルブガイド４の全 長を長さＬ1とすると、バルブガイド４の突出量Ｌ0はバルブステム３の外径Ｄの 少なくとも２倍以上とし、またバルブガイド４の全長Ｌ1は同じく外径Ｄの少な くとも６倍以上に設定されている。The valve guide 4 has a predetermined sliding gap with the valve stem 3, and further has a protrusion height L 0 from the reference surface 1 A, which is the upper surface of the cylinder head 1, and a total length of the valve guide 4. When L 1 is set, the protrusion amount L 0 of the valve guide 4 is set to be at least twice the outer diameter D of the valve stem 3, and the total length L 1 of the valve guide 4 is also set to be at least 6 times the outer diameter D. Has been done.
【０００９】 以上のように構成され、次に作用について説明する。With the above-mentioned configuration, the operation will be described.
【００１０】 図示しないカムに従動してバルブステム３はバルブガイド４の内周を摺動しな がら上下に往復動し、バルブ２をバルブシート１０に接離してガスの排気を行う 。The valve stem 3 reciprocates up and down while sliding on the inner circumference of the valve guide 4 in accordance with a cam (not shown), and the valve 2 is brought into and out of contact with the valve seat 10 to exhaust gas.
【００１１】 バルブガイド４のシリンダヘッド１の基準面１Ａからの突出量Ｌ0を従来はバ ルブステム３の外径Ｄの１．６倍程度であったものを少なくとも２倍以上とし、 さらに全長Ｌ1をバルブステム３の外径Ｄの６倍以上としたためバルブステム３ がバルブガイド４と摺動する距離が長くなってバルブステム３の傾きが減少し、 バルブコッタ（バルブの首振り）などを低減するために排気バルブ２の片当たり や及びバルブシート１０偏摩耗を低減することが可能となる。The protrusion amount L 0 of the valve guide 4 from the reference surface 1 A of the cylinder head 1 is 1.6 times the outer diameter D of the valve stem 3 in the related art, but is at least twice or more, and the total length L 0 Since 1 is set to 6 times or more of the outer diameter D of the valve stem 3, the distance that the valve stem 3 slides with the valve guide 4 becomes longer, the inclination of the valve stem 3 is reduced, and the valve cotter (swing of the valve) is reduced. Therefore, it is possible to reduce uneven contact of the exhaust valve 2 and uneven wear of the valve seat 10.
【００１２】 突出量Ｌ0及び全長Ｌ1の上記設定値は吸排気ポートなどに構造上の変更を加え ることがない範囲で実験的に求められたものであり、バルブガイド４を上記設定 値とするだけで前記従来例におけるバルブステム３の傾斜θを大幅に低減するこ とができ、従来品のシリンダヘッド１を使用することもできるため改良に拘わる コストの大幅な上昇を防いでいる。The above-mentioned set values of the protrusion amount L 0 and the total length L 1 are experimentally obtained within a range that does not make structural changes to the intake and exhaust ports, and the valve guide 4 is set to the above-mentioned set values. The inclination .theta. Of the valve stem 3 in the conventional example can be greatly reduced only by the above, and the conventional cylinder head 1 can be used, so that a large increase in cost associated with the improvement can be prevented.
【００１３】[0013]
以上のように本考案は、少なくともバルブガイドの突出量をバルブステムの外 径の２倍以上に設定するとともに、バルブガイドの全長をバルブステムの外径の ６倍以上に設定したため、バルブガイドに対するバルブステムの傾斜を減少させ て吸排気バルブ及びバルブシートの偏摩耗を低減することが可能となり、動弁系 の信頼性を向上させると共に改良に拘わるコストの上昇を抑制できる。 As described above, according to the present invention, the protrusion amount of the valve guide is set to be at least twice the outer diameter of the valve stem, and the total length of the valve guide is set to be at least six times the outer diameter of the valve stem. It is possible to reduce the inclination of the valve stem to reduce uneven wear of the intake and exhaust valves and the valve seat, improve the reliability of the valve train, and suppress the cost increase related to the improvement.
【図１】本考案の実施例を示す概略図である。FIG. 1 is a schematic view showing an embodiment of the present invention.
【図２】従来の例を示す概略図である。FIG. 2 is a schematic view showing a conventional example.
１ シリンダヘッド ２ バルブ ３ バルブステム ４ バルブガイド 1 Cylinder head 2 Valve 3 Valve stem 4 Valve guide
Claims (1)
ルブステムを案内するバルブガイドをシリンダヘッドに
収装する吸排気弁において、バルブガイドの前記シリン
ダヘッドの基準面からの突出量を、前記バルブステムの
外径の２倍以上に設定するとともに、前記バルブガイド
の全長をバルブステムの外径の６倍以上に設定したこと
を特徴とする内燃機関の吸排気バルブ。1. In a valve stem driven by a cam and an intake / exhaust valve in which a valve guide for guiding the valve stem is housed in a cylinder head, the amount of protrusion of the valve guide from the reference surface of the cylinder head is defined by the valve An intake / exhaust valve for an internal combustion engine, characterized in that the valve guide is set to have an outer diameter of at least twice and the total length of the valve guide is set to be at least six times of the outer diameter of the valve stem.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7170392U JPH0637507U (en) | 1992-10-14 | 1992-10-14 | Intake and exhaust valves for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7170392U JPH0637507U (en) | 1992-10-14 | 1992-10-14 | Intake and exhaust valves for internal combustion engines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0637507U true JPH0637507U (en) | 1994-05-20 |
Family
ID=13468169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7170392U Pending JPH0637507U (en) | 1992-10-14 | 1992-10-14 | Intake and exhaust valves for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0637507U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012132070A1 (en) | 2011-03-31 | 2012-10-04 | 三菱重工業株式会社 | Cylinder structure of internal combustion engine |
| JP2013237449A (en) * | 2013-09-05 | 2013-11-28 | Oiles Corp | Rack and pinion steering device |
-
1992
- 1992-10-14 JP JP7170392U patent/JPH0637507U/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012132070A1 (en) | 2011-03-31 | 2012-10-04 | 三菱重工業株式会社 | Cylinder structure of internal combustion engine |
| JP2012215105A (en) * | 2011-03-31 | 2012-11-08 | Mitsubishi Heavy Ind Ltd | Cylinder structure of internal combustion engine |
| KR101481932B1 (en) * | 2011-03-31 | 2015-01-12 | 미츠비시 쥬고교 가부시키가이샤 | Cylinder structure of internal combustion engine |
| JP2013237449A (en) * | 2013-09-05 | 2013-11-28 | Oiles Corp | Rack and pinion steering device |
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