JPH01271607A - Valve seat of engine - Google Patents
Valve seat of engineInfo
- Publication number
- JPH01271607A JPH01271607A JP10069288A JP10069288A JPH01271607A JP H01271607 A JPH01271607 A JP H01271607A JP 10069288 A JP10069288 A JP 10069288A JP 10069288 A JP10069288 A JP 10069288A JP H01271607 A JPH01271607 A JP H01271607A
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- valve
- engine
- tool
- ceramic
- 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 claims abstract description 14
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 9
- 239000010432 diamond Substances 0.000 claims abstract description 9
- 230000008021 deposition Effects 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明はエンジン上部に設けた排気ガスのバルブ装置に
使用するバルブシートＡとその加工方法に関するもので
、ガソリンエンジン及びディーゼルエンジン等の内燃機
関全般に使用されるものである。Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to a valve seat A used in an exhaust gas valve device installed at the top of an engine and a method for processing the same. It is used in general internal combustion engines such as engines.
（従来の技術）
エンジン上部に設けた吸排気のバルブ機構のうち排気ガ
スのバルブ装置１０を第５図に示す。１１はバネにて上
下動するバルブでロッド１２と一体で、バルブシート１
３はエンジンブロックに圧入固着されている。(Prior Art) FIG. 5 shows an exhaust gas valve device 10 among the intake and exhaust valve mechanisms provided at the top of the engine. 11 is a valve that moves up and down with a spring, and is integrated with the rod 12, and is attached to the valve seat 1.
3 is press-fitted and fixed to the engine block.
このバルブ１１及びバルブシート１３はエンジン運転中
は非常な高温、高圧に曝されその上に熱効率の向上、高
出力化の要求が強くバルブ装置の使用条件は更に過酷な
ものになりつつある（技術雑誌“潤滑”第３２巻第１１
号（１９８７）７８６〜７８９）。These valves 11 and valve seats 13 are exposed to extremely high temperatures and pressures during engine operation, and there is a strong demand for improved thermal efficiency and higher output, and the operating conditions for valve devices are becoming even more severe (technical technology). Magazine “Lubrication” Volume 32 No. 11
No. (1987) 786-789).
前記バルブ及びバルブシートは過酷な使用により損傷が
起こり易くその原因としては、（ａ）高温酸化腐食、（
ｂ）吹抜け、（Ｃ）低温腐食、（ｄ）機械応力及び熱疲
労破壊かあり、第６図のバルブ１１とバルブシート１２
の摺動面１１ａ及び１３ａに損傷が発生する。The valves and valve seats are prone to damage due to harsh use, and the causes include (a) high temperature oxidation corrosion, (
b) Blow-through, (C) Low-temperature corrosion, (d) Mechanical stress and thermal fatigue failure, valve 11 and valve seat 12 in Figure 6.
Damage occurs to the sliding surfaces 11a and 13a.
これらの損傷を防止するためにバルブ及びバルブシート
の金属材料として耐熱、耐食性にすぐれたオーステナイ
ト系の耐熱鋼例えば５ＵＥ５２などが使用されている。In order to prevent these damages, austenitic heat-resistant steel with excellent heat resistance and corrosion resistance, such as 5UE52, is used as a metal material for valves and valve seats.
（発明が解決しようとする課題）
しかしエンジン特にディーゼルエンジンに於いては、燃
料油の低質化１機関の高山化などにより、バルブ及びバ
ルブシートに耐熱鋼を使用しても長期間の運転を行うと
腐食摩耗が極めて大きく燃焼が発生し出力が低下すると
いう問題点がある。(Problem to be solved by the invention) However, in engines, especially diesel engines, due to the low quality of fuel oil and the high altitude of engines, even if heat-resistant steel is used for valves and valve seats, it is difficult to operate for a long period of time. There is a problem that corrosion and wear are extremely large, combustion occurs, and output decreases.
本発明はエンジンに於いて高い出力などのためにバルブ
装置を過酷に使用しても腐食摩耗することない内燃機関
のバルブシートを得ることを技術的課題とするものであ
る。The technical object of the present invention is to obtain a valve seat for an internal combustion engine that will not suffer corrosive wear even if the valve device is used severely for high output in the engine.
（課題を解決するための手段）
前記技術的課題を解決するために講じた技術的手段は次
のとおりである。すなわち、エンジンの排気装置のバル
ブシートに於いて、前記円形のバルブシートをセラミッ
クスで成形して、排気孔に圧入後、バルブと同形状で前
記バルブシートと摺動接触する面にダイヤモンド粒を固
着した研削工具にてバルブシートの中心線と同一の中心
線にてバルブシートのシート面を研削及び研磨加工する
ものである。(Means for solving the problem) The technical means taken to solve the above technical problem are as follows. That is, in the valve seat of an engine exhaust system, the circular valve seat is molded from ceramics, and after being press-fitted into the exhaust hole, diamond grains are fixed to the surface that has the same shape as the valve and makes sliding contact with the valve seat. The seat surface of the valve seat is ground and polished using the same grinding tool as the center line of the valve seat.
（作用）
耐熱性及び耐食性に優れたセラミックスをバルブシート
に使用することにより、長期間の使用によりバルブシー
トが腐食摩耗することはない。(Function) By using ceramics with excellent heat resistance and corrosion resistance for the valve seat, the valve seat will not corrode and wear out due to long-term use.
然しバルブシートにバルブ接触面を予め設計して単品成
形後、排気孔の表面に圧入しても、パルプ接触面の密着
度が適切でないと出力低下が起こるためにバルブと同形
状のダイヤモンド粒を固着した研削工具により、硬度の
高いセラミックス表面をダイヤモンドにて研削するもの
である。However, even if you design the valve contact surface on the valve seat in advance and press it into the exhaust hole surface after molding it as a single item, if the adhesion of the pulp contact surface is not appropriate, the output will decrease, so diamond grains with the same shape as the valve are used. A fixed grinding tool is used to grind the hard ceramic surface using diamond.
これによりセラミックスよりなるバルブシートと耐熱鋼
よりなるバルブとの弁座部分は密着がよく、かつまった
く腐食、摩耗しないために長期間にわたり高出力の内燃
機関として使用できるものである。As a result, the valve seat made of ceramics and the valve seat made of heat-resistant steel have good adhesion, and there is no corrosion or wear at all, so that the valve seat can be used as a high-output internal combustion engine for a long period of time.
（実施例） 以下実施例について説明する。(Example) Examples will be described below.
第１図の１はセラミックより成形されたリング状のバル
ブシートで、内燃機関の排気孔に圧入されるもので、ｌ
ａはバルブシートとバルブとの接触摺動面である。1 in Figure 1 is a ring-shaped valve seat made of ceramic, which is press-fitted into the exhaust hole of an internal combustion engine.
a is the contact sliding surface between the valve seat and the valve.
第２図は本実施例のセラミックスよりなるバルブシート
２で、バルブに密着するように２ａに示す箇所が研磨加
工されたものである。FIG. 2 shows a valve seat 2 made of ceramic according to this embodiment, in which the portion shown at 2a has been polished so as to be in close contact with the valve.
第３図は前記セラミックスよりなるバルブシート１の研
削及び研磨加工方法の説明図で、３はバルブ形状をした
研削工具で、４は軸部、５はバルブシート１のバルブと
の接触面を研削する電着ダイヤモンド層の切削部であり
、６は軸受部である。FIG. 3 is an explanatory diagram of the method of grinding and polishing the valve seat 1 made of ceramics, where 3 is a valve-shaped grinding tool, 4 is a shaft portion, and 5 is a grinding surface of the valve seat 1 that contacts the valve. 6 is a cutting portion of the electrodeposited diamond layer, and 6 is a bearing portion.
前記バルブ形状の研削工具３を軸部４の上部（図示なし
）を把持し上昇させながら回転してバルブシートの１ａ
部を研削する。The valve-shaped grinding tool 3 is gripped by the upper part (not shown) of the shaft part 4 and rotated while being raised to cut the valve seat 1a.
Grind the part.
第４図は他の実施例で研削工具３の下方に回転駆動可能
な駆動軸７を樹脂等の接着剤８にて固着して一体化した
ものである。FIG. 4 shows another embodiment in which a drive shaft 7 rotatably driven below the grinding tool 3 is fixed and integrated with an adhesive 8 such as resin.
前記駆動軸７を上昇９回転すれば、セラミックスよりな
るバルブシート２の摺動面２ａを円錐形状のダイヤモン
ド電着工具５にて研削及び研磨するものである。When the drive shaft 7 is rotated upward nine times, the sliding surface 2a of the valve seat 2 made of ceramic is ground and polished by the conical diamond electrodeposition tool 5.
前記実施例に於いて、研削工具３の中心線はエンジンブ
ロックの中心線と一致しているために、バルブシート１
の摺動面１は、エンジン機能部品が組立られた状態のバ
ルブと同一の位置に一致しており、バルブシートの弁座
の摺動面は完全に密着し、出力低下を伴うガス漏れはま
ったく無く、エンジンを過酷な使用をしてもバルブシー
トがセラミックスより形成されているために耐摩耗、及
び腐食等の損失の発生はないものである。In the above embodiment, since the center line of the grinding tool 3 coincides with the center line of the engine block, the valve seat 1
The sliding surface 1 of the engine is in the same position as the valve when the engine functional parts are assembled, and the sliding surface of the valve seat is in perfect contact with the valve seat, and there is no gas leakage that causes a decrease in output. Since the valve seat is made of ceramics, there will be no loss due to wear resistance or corrosion even if the engine is used harshly.
本発明は次の効果を有する。すなわち、実際に使用中の
バルブを加工工具として利用するために治工具が不要と
なり、更にバルブシートがセラミックス化することによ
り、エンジン寿命が向上し、ガスヒートポンプ等に使用
した場合にはメンテナンスフリー化が更に推進できる。The present invention has the following effects. In other words, jigs and tools are no longer required because the valves actually in use can be used as processing tools, and the valve seat is made of ceramic, which improves engine life and makes it maintenance-free when used in gas heat pumps, etc. can be further promoted.
第１図及び第２図はセラミックス製のバルプシ−トの断
面図、第３図は本実施例であるバルブシートの研削及び
研磨加工方法の説明図、第４図は他の実施例の説明図、
第５図はエンジンの排気装置の説明図、第６図はバノト
プとバルブシート破損箇所の説明図である。
１・・・研削及び研磨加工前のバルブシート２・・・研
削及び研磨加工後のバルブシート３・・・バルブ形状を
した研削工具。
４・・・軸。
５・・・ダイヤモンドを固着した研削部。
７・・・駆動軸。
８・・・接着部。Figures 1 and 2 are cross-sectional views of a ceramic valve seat, Figure 3 is an explanatory diagram of the method of grinding and polishing a valve seat according to this embodiment, and Figure 4 is an explanatory diagram of another embodiment. ,
FIG. 5 is an explanatory diagram of the engine exhaust system, and FIG. 6 is an explanatory diagram of the vanotop and the damaged valve seat. 1 Valve seat before grinding and polishing 2 Valve seat after grinding and polishing 3 Valve-shaped grinding tool. 4... Axis. 5... Grinding part with diamond fixed. 7... Drive shaft. 8... Adhesive part.
Claims (1)
て、前記円形のバルブシートをセラミックスで成形し、
エンジンブロックの排気孔に圧入後、バルブと同形状で
前記バルブシートと摺動接触するバルブの円錐面にダイ
ヤモンド粒を電着した研削工具にて、エンジンに装着す
るバルブの中心線と同じ中心線に位置してバルブシート
の摺動面を研削及び研磨成形したエンジンのバルブシー
ト。In the valve seat of the exhaust system located at the top of the engine, the circular valve seat is molded from ceramics,
After press-fitting into the exhaust hole of the engine block, use a grinding tool with diamond grains electrodeposited on the conical surface of the valve, which has the same shape as the valve and makes sliding contact with the valve seat, so that the center line is the same as the center line of the valve installed in the engine. An engine valve seat where the sliding surface of the valve seat is ground and polished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10069288A JPH01271607A (en) | 1988-04-22 | 1988-04-22 | Valve seat of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10069288A JPH01271607A (en) | 1988-04-22 | 1988-04-22 | Valve seat of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01271607A true JPH01271607A (en) | 1989-10-30 |
Family
ID=14280780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10069288A Pending JPH01271607A (en) | 1988-04-22 | 1988-04-22 | Valve seat of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01271607A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194479A (en) * | 2015-05-27 | 2016-12-07 | 丰田自动车株式会社 | Internal combustion engine |
-
1988
- 1988-04-22 JP JP10069288A patent/JPH01271607A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194479A (en) * | 2015-05-27 | 2016-12-07 | 丰田自动车株式会社 | Internal combustion engine |
| JP2016223303A (en) * | 2015-05-27 | 2016-12-28 | トヨタ自動車株式会社 | Internal combustion engine |
| US9964066B2 (en) | 2015-05-27 | 2018-05-08 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
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