CN2082763U - Embedded ceramic valve seat - Google Patents
Embedded ceramic valve seat Download PDFInfo
- Publication number
- CN2082763U CN2082763U CN 90205193 CN90205193U CN2082763U CN 2082763 U CN2082763 U CN 2082763U CN 90205193 CN90205193 CN 90205193 CN 90205193 U CN90205193 U CN 90205193U CN 2082763 U CN2082763 U CN 2082763U
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- CN
- China
- Prior art keywords
- valve seat
- ceramic
- ceramic body
- metal sleeve
- embedded
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- Expired - Lifetime
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Abstract
一种嵌装式结构的陶瓷气门座，它由陶瓷本体和 陶瓷本体外周及底面嵌装一金属套所构成。在陶瓷 本体的外径处，用过盈的方法嵌装金属套，金属套过 盈地配装在气缸盖的气门座孔中。陶瓷本体可采用 氧化物或氮化物高温结构陶瓷，金属套的材料可选用 中、低碳钢。采用本气门座结构，能缓和气门落座的 冲击作用，发挥陶瓷材料高温特性好、承受压应力性 能高的优点。嵌装式结构的陶瓷气门座耐用性好，使 用寿命长。
A ceramic valve seat with an embedded structure is composed of a ceramic body and a metal sleeve embedded in the outer periphery and bottom surface of the ceramic body. At the outer diameter of the ceramic body, a metal sleeve is embedded with an interference method, and the metal sleeve is fitted in the valve seat hole of the cylinder head with an interference fit. The ceramic body can be made of oxide or nitride high-temperature structural ceramics, and the material of the metal sleeve can be made of medium and low carbon steel. By adopting the valve seat structure, the impact effect of valve seating can be alleviated, and the advantages of ceramic materials with good high-temperature characteristics and high compressive stress bearing performance can be brought into play. The ceramic valve seat with embedded structure has good durability and long service life.
Description
The utility model belongs to a kind of valve seat of internal-combustion engine, is applicable to that agricultural, automobile-used, power station with, middle-size and small-size internal-combustion engine peculiar to vessel, is specially adapted to the valve seat as high reinforcement degree motor.
Traditional engine valve seat is that to adopt alloy cast iron or refractory steel be made, and the subject matter that its exists is: when operating temperature surpassed 400 ℃～500 ℃, the intensity of alloy cast iron or refractory steel obviously descended.In addition, in the running of motor, valve is to the valve seat percussion of taking a seat, and under this high frequency was taken a seat impact force action, valve and valve seat wearing and tearing were very fast, faults such as valve seat sink usually occur, and influence the long-term reliable operation of motor.Late nineteen seventies begins to be conceived to the research that the high-temperature structural ceramics part is used in the world on internal-combustion engine.A Sinani in U.S. automotive engineer association (SAE) collection of thesis 850358, Ke's energy (M.Asnani, F.L.Kuonen) taken the lead in delivering the paper of " performance of diesel engine ceramic valve and ceramic valve seat " (Ceramic Valve and Seat Insert Performance in a Diesel Engine), use Materials for Valve Seat instead high-temperature structural ceramics, solve the problems referred to above, satisfied the operating conditions of high reinforcement engine valve seat.Deficiency is because stupalith fragility is big, under the air valve drop impact force action, causes problems such as valve pedestal rhegma or sealing cone skin-material peel off, and influences tightness until making the motor cisco unity malfunction.
The purpose of this utility model is to overcome above-mentioned deficiency of the prior art and a kind of embedded structure ceramic valve seat is provided.The valve seat of this structure can relax the percussion of air valve drop; Can bring into play better high temperature resistant structure ceramics hot strength height, wear-resisting, corrosion-resistant, bear the pressure advantages of higher; Guarantee the serviceability of ceramic valve seat.
The invention main points are as follows:
The utility model is a kind of embedded structure ceramic valve seat that is made of ceramic body and ceramic body periphery and bottom surface setting-in one metallic sheath, the ceramic body material of this valve seat is oxide or nitride high-temperature structural ceramics, during metallic sheath is selected for use, low carbon steel is material.
The utility model is described in further detail below in conjunction with drawings and Examples:
Accompanying drawing is an embedded structure ceramic valve seat schematic representation.1 is that ceramic body, 2 is metallic sheath among the figure.Ceramic body is an annulus, and an end of ring is tapered opening, and metallic sheath is the circular sleeve that an end has seam, and the sleeve lining height is consistent with the ceramic body height, and the width of seam is not more than the width of ceramic body annulus.D is the external diameter of ceramic body.D is the external diameter of metallic sheath.The metallic sheath wall thickness is advisable for (D-d)/2=0.5～2.0mm.In the outer radius of ceramic body 1, with the method setting-in metallic sheath 2 of interference, ceramic body 1 is (2～8) %d with the magnitude of interference of metallic sheath 2.Be fitted in the valve-seat bore of cylinder head to metallic sheath 2 interference, the magnitude of interference of metallic sheath outer diameter D and cylinder head valve-seat bore is (3～10) %D.Such structure, the geometrical shape deviation that forms in the cylinder head valve-seat bore course of working is mainly born by the distortion of metallic sheath 2, can not bring out rhegma in the ceramic body 1 place too big localized stress of generation.In addition, in the engine operation process, when the percussion of taking a seat of valve acts directly on the ceramic body 1, metallic sheath 2 is because the elastic deformability is stronger, played a kind of buffer function, also reduced air valve drop and impacted the impact stress that on ceramic body 1, causes, thereby made the ceramic valve seat more durable.
The inventor once had following embodiment:
Ceramic body adopts zirconium oxide or silicon nitride or Sialon, metallic sheath material selection low carbon steel, outside diameter d=the 56mm of ceramic body 1, outer diameter D=the 58mm of metallic sheath 2, the magnitude of interference of the outside diameter d of ceramic body and metallic sheath 2 is 0.035mm, and metallic sheath 2 is 0.045mm with the magnitude of interference of the valve-seat bore of cast-iron head.What adopt this structure is the 2135G diesel engine that Shanghai Diesel Engine Plant produces.
The utility model is compared the conventional ceramic valve seating and is had the following advantages:
(1) flush type ceramic valve holder structure can relax the percussion of air valve drop, and it is good to give full play to the ceramic material hot properties, bears the high advantage of compression performance, has solved rhegma or the surfacial spalling phenomenon of ceramic valve seat.
(2) valve seating structure of the present utility model, examining through the operation of the real machine more than 500 hours on the 2135G diesel engine, valve seating work is good, the phenomenon such as do not find rhegma, peel off, prove that this structure valve seating can adapt to the condition of work of reinforcing stimulus, make the better and longer service life of ceramic valve seat durability.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90205193 CN2082763U (en) | 1990-04-20 | 1990-04-20 | Embedded ceramic valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90205193 CN2082763U (en) | 1990-04-20 | 1990-04-20 | Embedded ceramic valve seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2082763U true CN2082763U (en) | 1991-08-14 |
Family
ID=4886006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90205193 Expired - Lifetime CN2082763U (en) | 1990-04-20 | 1990-04-20 | Embedded ceramic valve seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2082763U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340748C (en) * | 2004-11-03 | 2007-10-03 | 重庆力帆实业（集团）有限公司 | Water-cooled dual-fuel engine exhaust valve stand |
| CN100340747C (en) * | 2004-11-03 | 2007-10-03 | 重庆力帆实业（集团）有限公司 | Water-cooled dual-fuel engine intake valve stand |
| CN101922376A (en) * | 2009-06-15 | 2010-12-22 | 通用汽车环球科技运作公司 | The corrosion resistant insert that is used for cylinder head |
-
1990
- 1990-04-20 CN CN 90205193 patent/CN2082763U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340748C (en) * | 2004-11-03 | 2007-10-03 | 重庆力帆实业（集团）有限公司 | Water-cooled dual-fuel engine exhaust valve stand |
| CN100340747C (en) * | 2004-11-03 | 2007-10-03 | 重庆力帆实业（集团）有限公司 | Water-cooled dual-fuel engine intake valve stand |
| CN101922376A (en) * | 2009-06-15 | 2010-12-22 | 通用汽车环球科技运作公司 | The corrosion resistant insert that is used for cylinder head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |