JPH021448Y2 - - Google Patents
Info
- Publication number
- JPH021448Y2 JPH021448Y2 JP16086384U JP16086384U JPH021448Y2 JP H021448 Y2 JPH021448 Y2 JP H021448Y2 JP 16086384 U JP16086384 U JP 16086384U JP 16086384 U JP16086384 U JP 16086384U JP H021448 Y2 JPH021448 Y2 JP H021448Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- intake
- guide hole
- exhaust
- stepped
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
この考案は、エンジンの吸・排気弁のカーボン
付着に起因する弁膠着を防止する装置に関する。[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a device for preventing valve stagnation caused by carbon adhesion on intake and exhaust valves of an engine.
〈従来技術〉
従来、エンジンの吸・排気弁の膠着防止装置と
して、例えば本出願人による実開昭59−52109号
公報により、第２図に示すものが開示されてい
る。<Prior Art> Conventionally, as an engine intake/exhaust valve sticking prevention device, for example, the one shown in FIG. 2 has been disclosed in Japanese Utility Model Application Publication No. 59-52109 filed by the present applicant.
すなわち、エンジン１の吸・排気弁２の弁軸４
のうち吸・排気ポート１４に出入りする付近のポ
ート近傍弁軸部分５に段落状細径部６、太径突条
部７及び段落状溝部８を弁頭３側から順に並べて
形成し、吸・排気弁２が全開した状態では、太径
突条部７の一部が弁案内孔９の孔内端１０より
吸・排気弁ポート１４側に突出して、排気に含ま
れたカーボンを弁案内孔９と弁軸４との間隙に進
入しにくくするとともに、吸・排気弁２が全閉し
た状態では段落状細径部６が弁案内孔９の孔内端
１０より弁案内孔９内に退入するように形成し、
段落状溝部と弁案内孔との空間によつて、カーボ
ンが侵入しても膠着を生じさせないようにしてい
た。 That is, the valve shaft 4 of the intake/exhaust valve 2 of the engine 1
A stepped narrow diameter portion 6, a large diameter protruding portion 7, and a stepped groove portion 8 are formed in order from the valve head 3 side in the valve shaft portion 5 near the port where the suction/exhaust port 14 enters and exits. When the exhaust valve 2 is fully open, a part of the large-diameter protrusion 7 protrudes from the inner end 10 of the valve guide hole 9 toward the intake/exhaust valve port 14 side, and the carbon contained in the exhaust gas is transferred to the valve guide hole. 9 and the valve stem 4, and when the intake/exhaust valve 2 is fully closed, the stepped narrow diameter portion 6 retreats into the valve guide hole 9 from the inner end 10 of the valve guide hole 9. form it so that it enters the
The space between the step-shaped groove and the valve guide hole prevents stagnation even if carbon enters.
また開閉行程において、段落状溝部８の溝奥端
面外周縁１１の掻取りエツジａ、太径突条部７の
奥端面外周縁１２の掻取りエツジｂ及び太径突条
部７の外端面外周縁１３の掻取りエツジｃで弁案
内孔９の周面に付着したカーボンを掻取り、前者
の掻取りエツジａ，ｂで掻取つたカーボンは段落
状溝部８に回収し、後者の掻取りエツジｃで掻き
取つたカーボンは吸・排気ポート１４より吸・排
気ガス流で排出するように構成したものである。 In addition, in the opening/closing process, the scraped edge a of the outer peripheral edge 11 of the groove inner end surface of the stepped groove 8, the scraped edge b of the outer peripheral edge 12 of the inner end surface of the large diameter protrusion 7, and the outer edge of the outer end surface of the large diameter protrusion 7. The carbon adhering to the circumferential surface of the valve guide hole 9 is scraped off with the scraping edge c of the peripheral edge 13, and the carbon scraped off with the former scraping edges a and b is collected into the stepped groove 8, and the carbon that has been scraped off with the former scraping edge a and b is collected into the stepped groove 8, and The structure is such that the carbon scraped off in step c is discharged from the intake/exhaust port 14 in the flow of intake/exhaust gas.
〈考案が解決しようとする問題点〉
しかるに、上記従来技術に係る吸・排気弁の膠
着防止装置の場合、従前の技術を遥かに凌ぐ膠着
防止効果が見られたが、相当長期に亘つて使用す
ると閉弁位置付近では問題ないが、弁全開位置近
傍で膠着現象が発現するのに至る。<Problems to be solved by the invention> However, in the case of the intake/exhaust valve sticking prevention device according to the above-mentioned conventional technology, although it was found that the anti-sticking effect was far superior to that of the previous technology, it was not possible to use the device for a considerable long period of time. As a result, there is no problem near the valve closed position, but a stalemate phenomenon occurs near the valve fully open position.
本考案者らの鋭意研究の結果、その原因は第２
図に示すように、弁全閉時の段落状細径部６の弁
案内孔９内への退入位置Ｄが、弁全開時の段落状
溝部８の溝奥端面１１の進行位置Ｅよりもオーバ
ーラツプ状に深入しているため、そこへカーボン
が持ち込まれ、このオーバラツプ部分に膠着
域が形成され、溝奥端面１１の進行位置Ｅ近傍、
すなわち弁全開位置近傍で膠着現象が認められた
のである。 As a result of intensive research by the inventors, the cause was found to be the second cause.
As shown in the figure, the retreat position D of the stepped narrow diameter portion 6 into the valve guide hole 9 when the valve is fully closed is lower than the advanced position E of the groove inner end surface 11 of the stepped groove portion 8 when the valve is fully opened. Since it is deep in an overlap shape, carbon is brought there, and a sticking area is formed in this overlap part, near the advancing position E of the deep end face 11 of the groove.
In other words, a stalemate phenomenon was observed near the valve fully open position.
本考案は、上記のように考案者らの鋭意研究の
結果に基づいてなされたもので、その目的は長期
間に亘つて膠着を発現しないエンジンの吸・排気
弁の膠着防止装置を提供することにある。 The present invention was developed based on the results of intensive research by the inventors as described above, and its purpose is to provide an anti-sticking device for engine intake and exhaust valves that does not cause sticking over a long period of time. It is in.
〈問題点を解決するための手段〉
本考案は上記目的を達成するために、前記膠着
の原因を解消するもので、前記従来技術に係る
吸・排気弁の膠着防止装置において、弁全閉状態
での段落状細径部の弁案内孔内への退入位置が弁
全開状態での段落状溝部の溝奥端面の弁案内孔内
での進行位置よりも、吸・排気ポート側に偏位す
るという条件を満足させる寸法に段落状溝部の長
さ及び太径突条部の長さを設定したことを特徴と
するものである。<Means for Solving the Problems> In order to achieve the above object, the present invention eliminates the cause of the stalemate. The retraction position of the stepped narrow diameter portion into the valve guide hole is shifted toward the intake/exhaust port side compared to the advancing position of the groove inner end surface of the stepped groove inside the valve guide hole when the valve is fully open. This feature is characterized in that the length of the stepped groove and the length of the large diameter protrusion are set to dimensions that satisfy the condition that:
〈作用〉
弁全閉時の段落状細径部の弁案内孔内への退入
位置は、弁全開時の段落状溝部の溝奥端面の進行
位置よりも深く入らせないように構成され、前述
のようなオーバーラツプ部分、すなわち、そこへ
カーボンが持ち込まれる膠着域が形成されること
がなくなり、弁全開位置近傍での膠着現象が解消
される。<Function> The retracting position of the stepped narrow diameter portion into the valve guide hole when the valve is fully closed is configured such that it does not enter deeper than the advancing position of the groove inner end surface of the stepped groove when the valve is fully opened. The above-mentioned overlap region, that is, the stalemate region into which carbon is brought in, is no longer formed, and the stalemate phenomenon near the valve fully open position is eliminated.
〈実施例〉
以下、本考案をエンジンの排気弁に適用した実
施例により、説明する。<Example> The present invention will be described below using an example in which the present invention is applied to an exhaust valve of an engine.
第１図は本考案の要部側面図を示し、それぞれ
Ａは弁全閉時、Ｂは弁全開時の弁軸要部と弁案内
孔との関係を示す側面図であり、第１図におい
て、第２図と同様な機能を有する部材は同一の符
号を用いて示し、以下本考案の特徴的構造につい
て説明する。 FIG. 1 shows a side view of the main part of the present invention, where A is a side view showing the relationship between the main part of the valve shaft and the valve guide hole when the valve is fully closed, and B is a side view showing the relationship between the main part of the valve shaft and the valve guide hole when the valve is fully open. , members having the same functions as those in FIG. 2 are indicated using the same reference numerals, and the characteristic structure of the present invention will be described below.
第１図Ａに示すように、排気弁２が矢印Ｆで示
す方向に退行して閉弁作動を完了した弁全閉状態
にあつては、ポート近傍弁軸部分５の段落状細径
部６は弁案内孔９内へ退入して、その退入位置Ｄ
へ至る。 As shown in FIG. 1A, when the exhaust valve 2 is in the fully closed state in which it has retracted in the direction indicated by arrow F and has completed its closing operation, the stepped narrow diameter portion 6 of the valve shaft portion 5 near the port retracts into the valve guide hole 9 and reaches its retracted position D.
leading to.
他方同図Ｂに示すように、排気弁２が矢印Ｇで
示す方向に進行して開弁作動を完了した弁全開状
態にあつては、段落状溝部８の溝奥端面１１は弁
案内孔９内で進行して、その進行位置Ｅに至る。 On the other hand, as shown in FIG. 2B, when the exhaust valve 2 is in the fully open state in which it has moved in the direction shown by the arrow G and has completed its opening operation, the inner groove end surface 11 of the stepped groove portion 8 is in the valve guide hole 9. The vehicle advances within the vehicle and reaches its advancing position E.
上記退入位置Ｄと進行位置がオーバーラツプし
ないように、太径突条部７の長さL7及び段落状
溝部８の長さL8が設定されている。例えば、第
２図において従来の太径突条部７の外端１３を、
少なくともオーバーラツプ部分より長く延長
すればよい。 The length L7 of the large-diameter protruding portion 7 and the length L8 of the stepped groove portion 8 are set so that the retracted position D and the advanced position do not overlap. For example, in FIG. 2, the outer end 13 of the conventional large diameter protrusion 7 is
It is sufficient if it extends at least longer than the overlap portion.
本考案は、上記のようにしてオーバーラツプ部
分、即ち膠着域の形成を阻却したものであり、上
記実施例はエンジンの排気弁に適用した場合につ
いて説明したが、同様に吸気弁にも適用できるこ
とは云うまでもない。 The present invention prevents the formation of overlapping portions, that is, stalemate regions, as described above, and although the above embodiments have been described for the case where it is applied to an engine exhaust valve, it can also be similarly applied to an intake valve. Needless to say.
〈考案の効果〉
本考案は前記のように構成し、オーバーラツプ
部分をなくしたから、弁案内孔の奥部へのカ
ーボンの侵入を無くし、弁全開位置均傍での膠着
現象を長期に亘つて発現させないようにすること
ができる。<Effects of the invention> Since the present invention is constructed as described above and eliminates the overlapping part, it eliminates the intrusion of carbon into the deep part of the valve guide hole and prevents the stagnation phenomenon near the valve fully open position over a long period of time. It is possible to prevent the expression from occurring.
第１図Ａ，Ｂは、本考案の弁軸要部と弁案内孔
との関係を示す要部縦断側面図を示し、Ａ図は弁
全閉時、Ｂは弁全開時を示す。第２図は従来技術
に係る要部縦断側面図である。
１……エンジン、２……吸・排気弁、３……弁
頭、４……弁軸、５……ポート近傍弁軸部分、６
……段落状細径部、７……太径突条部、８……段
落状溝部、９……弁案内孔、１０……孔内端、１
１……溝奥端面、Ｄ……段落状細径部の弁案内孔
内への退入位置、Ｅ……溝奥端面の弁案内孔内で
の進行位置、L7……太径突条部の長さ、L8……
段落状溝部の長さ。
1A and 1B are longitudinal sectional side views of the main parts of the present invention showing the relationship between the main parts of the valve stem and the valve guide hole, and FIG. 1 shows the valve when the valve is fully closed, and FIG. 1B shows the valve when the valve is fully open. FIG. 2 is a vertical sectional side view of the main part according to the prior art. 1...Engine, 2...Intake/exhaust valve, 3...Valve head, 4...Valve shaft, 5...Valve shaft portion near port, 6
..... Stepped narrow diameter part, 7 .... Large diameter protruding section, 8 .... Stepped groove section, 9 .... Valve guide hole, 10 .... Hole inner end, 1
1...Groove inner end surface, D...Retreat position of the stepped narrow diameter portion into the valve guide hole, E...Progress position of the groove inner end surface within the valve guide hole, L7 ...Large diameter protrusion Part length, L 8 ...
Length of stepped groove.
Claims (1)
排気ポート１４に出入りする付近のポート近傍弁
軸部分５に段落状細径部６、太径突条部７及び段
落状溝部８を弁頭３側から順に並べて形成し、
吸・排気弁２が全開した状態では、太径突条部７
の一部が弁案内孔９の孔内端１０より吸・排気弁
ポート１４側に突出し、吸・排気弁２が全閉した
状態では、段落状細径部６が弁案内孔９の孔内端
１０より弁案内孔９内に退入するように構成した
エンジンの吸・排気弁の膠着防止装置において、
弁全閉状態での段落状細径部６の弁案内孔９内へ
の退入位置Ｄが弁全開状態での段落状溝部８の溝
奥端面１１の弁案内孔９内での進行位置Ｅより
も、吸・排気ポート側に偏位するという条件を満
足させる寸法に段落状溝部８の長さL8及び太径
突条部７の長さL7を設定したことを特徴とする
エンジンの吸・排気弁の膠着防止装置。 Of the valve shafts 4 of the intake/exhaust valves 2 of the engine 1,
A stepped narrow diameter portion 6, a large diameter protrusion portion 7, and a stepped groove portion 8 are formed in order from the valve head 3 side in the valve shaft portion 5 near the port where it enters and exits the exhaust port 14,
When the intake/exhaust valve 2 is fully open, the large diameter protrusion 7
A part of the part protrudes from the inner end 10 of the valve guide hole 9 toward the intake/exhaust valve port 14 side, and when the intake/exhaust valve 2 is fully closed, the stepped narrow diameter part 6 is inside the valve guide hole 9. In an engine intake/exhaust valve anti-sticking device configured to enter and retreat into the valve guide hole 9 from the end 10,
The retraction position D of the stepped narrow diameter portion 6 into the valve guide hole 9 when the valve is fully closed is the advancing position E of the inner groove end surface 11 of the stepped groove 8 within the valve guide hole 9 when the valve is fully open. An engine characterized in that the length L 8 of the stepped groove 8 and the length L 7 of the large diameter protrusion 7 are set to dimensions that satisfy the condition that they are deviated toward the intake/exhaust port side. Anti-sticking device for intake and exhaust valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16086384U JPH021448Y2 (en) | 1984-10-24 | 1984-10-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16086384U JPH021448Y2 (en) | 1984-10-24 | 1984-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6176102U JPS6176102U (en) | 1986-05-22 |
| JPH021448Y2 true JPH021448Y2 (en) | 1990-01-16 |
Family
ID=30718776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16086384U Expired JPH021448Y2 (en) | 1984-10-24 | 1984-10-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH021448Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6547588B2 (en) * | 2015-10-29 | 2019-07-24 | トヨタ自動車株式会社 | Valve apparatus for internal combustion engine |
-
1984
- 1984-10-24 JP JP16086384U patent/JPH021448Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6176102U (en) | 1986-05-22 |
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