JPS6137776Y2 - - Google Patents
Info
- Publication number
- JPS6137776Y2 JPS6137776Y2 JP1708380U JP1708380U JPS6137776Y2 JP S6137776 Y2 JPS6137776 Y2 JP S6137776Y2 JP 1708380 U JP1708380 U JP 1708380U JP 1708380 U JP1708380 U JP 1708380U JP S6137776 Y2 JPS6137776 Y2 JP S6137776Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- hole surface
- valve guide
- stem
- intake
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000004323 axial length Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【考案の詳細な説明】
本考案は内燃機関吸・排気バルブのステム部を
摺動自在に嵌挿するバルブガイドに関する。[Detailed Description of the Invention] The present invention relates to a valve guide into which a stem portion of an intake/exhaust valve of an internal combustion engine is slidably inserted.
内燃機関の吸・排気バルブ開閉機構において
は、バルブシートの加工不良やバルブの片当りに
よる偏摩耗等によりバルブに曲げ応力が加わり、
長期間の疲労によりバルブ自体が折損したり、バ
ルブガイドの摩耗が増大してついにはひび割れを
生じたりすることがあつた。 In the intake/exhaust valve opening/closing mechanism of an internal combustion engine, bending stress is applied to the valve due to poor processing of the valve seat or uneven wear due to uneven valve contact.
The valve itself could break due to long-term fatigue, or the valve guide would wear out and eventually crack.
かかるバルブの曲げ応力発生を抑制するために
はバルブのステム部とバルブガイドのクリアラン
スを大きくすればよいが、余り大きくし過ぎると
バルブがガタ付いて円滑な摺動が行なわれず却つ
てバルブガイドの偏摩耗を促進させてしまう。一
方、特に排気バルブにおいては、バルブ温度の過
昇をステム部からバルブガイドへの放熱によつて
抑制するためこの面ではステム部とバルブガイド
とのクリアランスを小さくする方が望ましい。
又、排気バルブをヘツド部からステム部下部にか
けて高熱強度耐腐蝕性に優れた21−4N鋼で形成
し、SUH3鋼製等のステム部上部と溶接結合した
ものがあるが、このものでは21−4N鋼の熱膨脹
係数が大きいためにステム部下部とバルブガイド
との間にカジリを生じることがあつた。 In order to suppress the occurrence of bending stress in the valve, it is possible to increase the clearance between the valve stem and the valve guide, but if it is made too large, the valve will become loose and will not be able to slide smoothly. Accelerates uneven wear. On the other hand, particularly in the case of an exhaust valve, it is desirable to reduce the clearance between the stem part and the valve guide in order to suppress an excessive rise in valve temperature by heat radiation from the stem part to the valve guide.
In addition, there are some models in which the exhaust valve is made of 21-4N steel, which has excellent high heat strength and corrosion resistance, from the head part to the lower part of the stem part, and is welded to the upper part of the stem part, such as SUH3 steel. Due to the large coefficient of thermal expansion of 4N steel, galling sometimes occurred between the lower part of the stem and the valve guide.
本考案はかかる従来の欠点に鑑み為されたもの
でバルブガイド孔面の少なくとも一方の端部を開
口端方向に開口面積が増大す円錘状孔面に形成
し、中央部は軸方向に孔径が一定の円筒形孔面に
形成した構成とすることによりバルブガイドとの
クリアランスを小さくした場合の欠点と大きくし
た場合の欠点とを共に巧みに解消した内燃機関用
吸・排気バルブのバルブガイドを提供するもので
ある。 The present invention was devised in view of such conventional drawbacks, and at least one end of the valve guide hole surface is formed into a conical hole surface whose opening area increases toward the opening end, and the center portion has a hole diameter that increases in the axial direction. We have developed a valve guide for intake and exhaust valves for internal combustion engines that skillfully eliminates both the drawbacks of making the clearance with the valve guide small and the drawbacks of making it large, by forming the clearance on a constant cylindrical hole surface. This is what we provide.
以下に本考案を図面に示す実施例に基づいて詳
細に説明する。 The present invention will be described in detail below based on embodiments shown in the drawings.
図においてシリンダヘツド１に固定されたバル
ブガイド２には吸・排気バルブ３のステム部３Ａ
が摺動自在に嵌挿され、ロツカーアーム４の揺動
によりバルブ３がリターンスプリング５の弾性力
に抗して開閉作動されることは周知の通りであ
る。 In the figure, the valve guide 2 fixed to the cylinder head 1 has a stem portion 3A of the intake/exhaust valve 3.
It is well known that the valve 3 is slidably inserted and the valve 3 is opened and closed by the swinging of the rocker arm 4 against the elastic force of the return spring 5.
かかる構成において、バルブガイド２の孔面両
端部を夫々開口端方向に開口面積が漸増する円錘
形孔面２ａ，２ｂ（但し２ａはロツカーアーム
側、２ｂは燃焼室側の円錘形孔面を示す）に形成
する。両円錘形孔面２ａ，２ｂ間に形成された中
央部孔面２ｃは孔径が軸方向に変化しない円筒形
孔面とし、該中央部孔面２ｃの孔径及び軸方向長
さはステム部３Ａの滑らかな摺動が確保され、か
つステム部３Ａと中央部孔面２ｃとのスカツフイ
ング及びバルブの倒れを防止できる大きさに形成
する。 In this configuration, both ends of the hole surface of the valve guide 2 are conical hole surfaces 2a and 2b whose opening area gradually increases toward the opening end (however, 2a is the conical hole surface on the rocker arm side, and 2b is the conical hole surface on the combustion chamber side). (shown). The central hole surface 2c formed between both conical hole surfaces 2a and 2b is a cylindrical hole surface whose hole diameter does not change in the axial direction, and the hole diameter and axial length of the central hole surface 2c are equal to those of the stem portion 3A. It is formed to a size that ensures smooth sliding of the valve and prevents scuffing between the stem portion 3A and the central hole surface 2c and the collapse of the valve.
一方、円錘形孔面２ａ，２ｂの円錘角及び軸方
向長さはステム部３Ａの両端部に生じる曲げ応力
を充分緩和できる大きさに形成する。即ち、バル
ブ３はヘツド部３Ｂのシート面３ａ或いは該シー
ト面３ａを着座させるバルブシート６の加工不
良、組立不良、偏摩耗等によつてヘツド部３Ｂ軸
線方向と直角な曲げ力を受けるが、このとき、ス
テム部３Ａの両端部において曲げ方向の変形を許
容して、バルブガイド２の孔面から受ける抗力を
抑制し、バルブ３に生じる曲げ応力の発生を軽減
できるようにする。 On the other hand, the conical angle and axial length of the conical hole surfaces 2a and 2b are set to a size that can sufficiently alleviate the bending stress generated at both ends of the stem portion 3A. That is, the valve 3 is subjected to bending force perpendicular to the axial direction of the head portion 3B due to poor processing, poor assembly, uneven wear, etc. of the seat surface 3a of the head portion 3B or the valve seat 6 on which the seat surface 3a is seated. At this time, deformation in the bending direction is allowed at both ends of the stem portion 3A to suppress the drag force received from the hole surface of the valve guide 2, and to reduce the bending stress generated in the valve 3.
このように構成すればバルブ３はステム部３Ａ
がバルブガイド２の中央部孔面２ｃと滑らかに摺
接して円滑な開閉動作が確保され、かつスカツフ
イングの発生及びバルブの倒れを防止できると共
に、ステム部３Ａ両端部の円錘形孔面２ａ，２ｂ
によつて許容されることによりバルブ３に生じる
曲げ応力が軽減され、バルブ３自体の折損を防止
できる。又、バルブ３からバルブガイド２に加え
られる外力も軽減できるのでバルブガイド２の摩
耗、ひび割れの発生を抑制できる。 With this configuration, the valve 3 has a stem portion 3A.
are in smooth sliding contact with the center hole surface 2c of the valve guide 2 to ensure smooth opening/closing operation and prevent the occurrence of scuffing and the valve from falling. 2b
By allowing this, the bending stress generated in the bulb 3 is reduced, and breakage of the bulb 3 itself can be prevented. Further, since the external force applied from the valve 3 to the valve guide 2 can be reduced, wear and cracking of the valve guide 2 can be suppressed.
又、バルブヘツド３Ｂからステム部３Ａの下部
にかけて21−4N鋼等比較的熱膨脹係数の大きな
金属材料で成形したものにおいてステム部３Ａ下
部が熱膨脹しても、円錘形孔面２ｂとの間の遊び
が増大するためカジリの発生を防止できる。 In addition, even if the lower part of the stem part 3A expands thermally in a product molded from a metal material with a relatively large coefficient of thermal expansion, such as 21-4N steel, from the valve head 3B to the lower part of the stem part 3A, there is no play between the valve head 3B and the conical hole surface 2b. Since this increases, the occurrence of galling can be prevented.
尚、本実施例ではバルブガイド２内周面の両端
部を円錘形孔面に形成したが、いずれか一方、特
に、曲げ応力が作用するバルブヘツド側のみにテ
ーパ面を設けたものだけでも充分な効果を有する
ものである。 In this embodiment, both ends of the inner circumferential surface of the valve guide 2 are formed into conical hole surfaces, but it is also sufficient to provide a tapered surface only on one of the ends, especially on the valve head side where bending stress is applied. It has a great effect.
以上説明したように、本考案によれば、バルブ
ガイド孔面の両端部を開口端方向に開口面積が増
大する円錘形孔面に形成したから、吸・排気バル
ブに生じる曲げ応力を軽減してバルブの折損、バ
ルブガイドの摩耗ひいてはひび割れ等を効果的に
防止でき、かつ、バルブガイド孔面円筒形孔面に
形成された中央部でバルブのステム部を円滑に摺
接させることができる。 As explained above, according to the present invention, since both ends of the valve guide hole surface are formed into conical hole surfaces whose opening area increases toward the opening end, the bending stress generated in the intake and exhaust valves can be reduced. This effectively prevents breakage of the valve, abrasion of the valve guide, and even cracking, and allows the stem portion of the valve to smoothly slide into contact with the central portion formed in the cylindrical hole surface of the valve guide hole surface.
図面は本考案の一実施例を示す断面図である。
２……バルブガイド、２ａ，２ｂ……円錘形孔
面、２ｃ……中央部孔面、３……吸・排気バル
ブ、３Ａ……ステム部。
The drawing is a sectional view showing an embodiment of the present invention. 2...Valve guide, 2a, 2b...Conical hole surface, 2c...Central hole surface, 3...Intake/exhaust valve, 3A...Stem portion.
Claims (1)
るバルブガイドの孔面の少なくとも一方の端部を
開口端方向に開口面積が漸増する円錘形孔面に形
成し、中央部は軸方向に孔径が一定の円筒形孔面
に形成したことを特徴とする内燃機関吸・排気バ
ルブのバルブガイド。 At least one end of the hole surface of the valve guide into which the stem portion of the intake/exhaust valve is slidably inserted is formed into a conical hole surface whose opening area gradually increases toward the opening end, and the center portion is formed into a conical hole surface whose opening area gradually increases toward the opening end. A valve guide for an internal combustion engine intake/exhaust valve, characterized in that a cylindrical hole surface with a constant hole diameter is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1708380U JPS6137776Y2 (en) | 1980-02-15 | 1980-02-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1708380U JPS6137776Y2 (en) | 1980-02-15 | 1980-02-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56120305U JPS56120305U (en) | 1981-09-12 |
| JPS6137776Y2 true JPS6137776Y2 (en) | 1986-11-01 |
Family
ID=29613472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1708380U Expired JPS6137776Y2 (en) | 1980-02-15 | 1980-02-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6137776Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0730687B2 (en) * | 1985-10-23 | 1995-04-10 | ヤマハ発動機株式会社 | Valve holding structure for internal combustion engine |
| JP4373761B2 (en) * | 2003-10-21 | 2009-11-25 | 日野自動車株式会社 | Valve guide structure |
| JP5296594B2 (en) * | 2009-04-07 | 2013-09-25 | 日鍛バルブ株式会社 | Exhaust poppet valve for internal combustion engines |
-
1980
- 1980-02-15 JP JP1708380U patent/JPS6137776Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56120305U (en) | 1981-09-12 |
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