Laser spark plug having an improved seal between the combustion chamber window and the casing
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02P-023/04
H01T-013/06
H01T-014/00
출원번호
US-0015913
(2016-02-04)
등록번호
US-9954343
(2018-04-24)
우선권정보
DE-10 2011 087 192 (2011-11-28)
발명자
/ 주소
Engelhardt, Joerg
Wolz, Dieter
Raimann, Juergen
Woerner, Pascal
Weinrotter, Martin
출원인 / 주소
ROBERT BOSCH GMBH
대리인 / 주소
Norton Rose Fulbright US LLP
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
A casing for a laser spark plug, in particular, of an internal combustion engine of a motor vehicle, or of a stationary engine; the casing including at least one casing part and a combustion chamber window joined to the casing part to form a seal at least regionally; characterized in that at least o
A casing for a laser spark plug, in particular, of an internal combustion engine of a motor vehicle, or of a stationary engine; the casing including at least one casing part and a combustion chamber window joined to the casing part to form a seal at least regionally; characterized in that at least one sealing element, whose coefficient of thermal expansion at an operating temperature of the laser spark plug is greater than the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug, is provided between the casing part and the combustion chamber window.
대표청구항▼
1. A casing for a laser spark plug, comprising: a casing part;a combustion chamber window joined to the casing part to form a seal at least regionally; and at least one sealing element, whose coefficient of thermal expansion at an operating temperature of the laser spark plug is greater than the coe
1. A casing for a laser spark plug, comprising: a casing part;a combustion chamber window joined to the casing part to form a seal at least regionally; and at least one sealing element, whose coefficient of thermal expansion at an operating temperature of the laser spark plug is greater than the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug, and which is between the casing part and the combustion chamber window, such that the combustion chamber window, the at least one sealing element, and the casing part are arranged, in that order, sequentially in a direction of an optical axis of the laser spark plug, wherein: in a region of contact with the casing part and/or with the combustion chamber window, the sealing element has a coating made of a material, which is different from a base material of the sealing element,the coating is applied to the base material and has a first thickness of approximately 50 μm to approximately 150 μm, andthe base material has a second thickness that is greater than the first thickness. 2. The casing of claim 1, wherein the coefficient of thermal expansion of the combustion chamber window at the operating temperature of the laser spark plug is less than the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug. 3. The casing of claim 1, wherein the coefficient of thermal expansion of the combustion chamber window at the operating temperature of the laser spark plug is between approximately 4*10^−6/K and approximately 10*10^−6/K. 4. The casing of claim 1, wherein the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug is between approximately 7*10^−6/K and approximately 16*10^−6/K. 5. The casing of claim 1, wherein the coefficient of thermal expansion of the sealing element at the operating temperature of the laser spark plug is between approximately 16*10^−6/K and approximately 20*10^−6/K. 6. The casing of claim 1, wherein the casing part and/or the sealing element is made of steel, and the combustion chamber window is made of sapphire. 7. The casing of claim 1, wherein the coefficient of thermal expansion of the combustion chamber window at the operating temperature of the laser spark plug is between approximately 4*10^−6/K and approximately 8*10^−6/K. 8. The casing of claim 1, wherein the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug is between approximately 7*10^−6/K and approximately 12*10^−6/K. 9. The casing of claim 1, wherein the coefficient of thermal expansion of the sealing element at the operating temperature of the laser spark plug is between approximately 16*10^−6/K and approximately 18*10^−6/K. 10. The casing of claim 1, wherein the casing part and/or the sealing element is made of steel, and the combustion chamber window is made of monocrystalline sapphire. 11. The casing of claim 1, wherein, in a region of contact with the casing part and/or with the combustion chamber window, the sealing element has a coating made of a material, which is different from the base material of the sealing element, the base material being made of steel and the coating being made of copper. 12. The casing of claim 1, wherein: the casing part includes a first end face that is positioned at a first coordinate of, and is not parallel to, the optical axis;the combustion chamber window includes a second end face that is positioned at a second coordinate of, and is not parallel to, the optical axis; andthe at least one sealing element is positioned between the first and second coordinates of the optical axis. 13. The casing of claim 1, wherein the coating is galvanically deposited on the sealing element. 14. A laser spark plug, comprising: a casing for the laser spark plug, including a casing part, a combustion chamber window joined to the casing part to form a seal at least regionally, and at least one sealing element;wherein:the coefficient of thermal expansion of the at least one sealing at an operating temperature of the laser spark plug is greater than the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug;the at least one sealing element is positioned between the casing part and the combustion chamber window, such that the combustion chamber window, the at least one sealing element, and the casing part are arranged, in that order, sequentially in a direction of an optical axis of the laser spark plug; andthe operating temperature of the laser spark plug is between approximately 200° C. and approximately 1100° C., wherein: in a region of contact with the casing part and/or with the combustion chamber window, the sealing element has a coating made of a material, which is different from a base material of the sealing element,the coating is applied to the base material and has a first thickness of approximately 50 μm to approximately 150 μm, andthe base material has a second thickness that is greater than the first thickness. 15. The laser spark plug of claim 14, wherein the operating temperature of the laser spark plug is between approximately 280° C. and approximately 600° C. 16. The laser spark plug of claim 14, wherein the laser spark plug is of an internal combustion engine of a motor vehicle or of a stationary engine. 17. A casing for a laser spark plug, comprising: at least one casing part;a combustion chamber window joined to the casing part to form a seal at least regionally; andat least one sealing element, whose coefficient of thermal expansion at an operating temperature of the laser spark plug is greater than the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug, is between the casing part and the combustion chamber window; wherein at least one of: a thickness of the sealing element is between approximately 0.4 mm and approximately 3 mm;a thickness of the combustion chamber window is between approximately 2 mm and approximately 8 mm;in a region of contact at least one of (a) with the at least one casing part and (b) the combustion chamber window, the sealing element includes at least one of: a lapped surface; anda coating in the form of a foil and made of a material that is different from a base material of the sealing element, a thickness of the coating being approximately 50 μm to approximately 150 μm;the at least one casing part is pressed against the combustion chamber window with a specifiable preloading force; andthe at least one sealing element includes two or more sealing elements, whose coefficients of thermal expansion at the operating temperature of the laser spark plug are different from each other, are provided between the casing part and the combustion chamber window. 18. The casing of claim 17, wherein the thickness of the sealing element is between approximately 0.4 mm and approximately 3 mm. 19. The casing of claim 18, wherein the thickness of the sealing element is between approximately 0.4 mm and approximately 1.0 mm. 20. The casing of claim 17, wherein the thickness of the combustion chamber window is between approximately 2 mm and approximately 8 mm. 21. The casing of claim 20, wherein the thickness of the combustion chamber window is between approximately 2 mm and approximately 4 mm. 22. The casing of claim 17, wherein the sealing element includes the lapped surface in the region of contact. 23. The casing of claim 17, wherein the sealing element includes the coating in the region of contact. 24. The casing of claim 17, wherein the at least one casing part is pressed against the combustion chamber window with the specifiable preloading force. 25. The casing of claim 17, wherein the at least one sealing element includes the two or more sealing elements provided between the casing part and the combustion chamber window. 26. A laser spark plug, comprising: a casing for the laser spark plug, including at least one casing part, a combustion chamber window joined to the casing part to form a seal at least regionally, and at least one sealing element, whose coefficient of thermal expansion at an operating temperature of the laser spark plug is greater than the coefficient of thermal expansion of the casing part at the operating temperature of the laser spark plug, is between the casing part and the combustion chamber window; wherein: the laser spark plug has an operating temperature of between approximately 200° C. and approximately 1100° C.; andat least one of: a thickness of the sealing element is between approximately 0.4 mm and approximately 3 mm;a thickness of the combustion chamber window is between approximately 2 mm and approximately 8 mm;in a region of contact at least one of (a) with the at least one casing part and (b) the combustion chamber window, the sealing element includes at least one of: a lapped surface; anda coating in the form of a foil and made of a material that is different from a base material of the sealing element, a thickness of the coating being approximately 50 μm to approximately 150 μm;the at least one casing part is pressed against the combustion chamber window with a specifiable preloading force; andthe at least one sealing element includes two or more sealing elements, whose coefficients of thermal expansion at the operating temperature of the laser spark plug are different from each other, are provided between the casing part and the combustion chamber window. 27. The laser spark plug of claim 26, wherein the thickness of the sealing element is between approximately 0.4 mm and approximately 3 mm. 28. The laser spark plug of claim 26, wherein the thickness of the combustion chamber window is between approximately 2 mm and approximately 8 mm. 29. The laser spark plug of claim 26, wherein the sealing element includes the lapped surface in the region of contact. 30. The laser spark plug of claim 26, wherein the sealing element includes the coating in the region of contact. 31. The laser spark plug of claim 26, wherein the at least one casing part is pressed against the combustion chamber window with the specifiable preloading force. 32. The laser spark plug of claim 26, wherein the at least one sealing element includes the two or more sealing elements provided between the casing part and the combustion chamber window.
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이 특허에 인용된 특허 (5)
DeFreitas Dennis M. (Oxford NY), Commonly housed electrostatic fuel atomizer and igniter apparatus for combustors.
Beyer Richard A. ; Burke Gregory C. ; O'Reilly John J. ; Smith David C. ; Kerwien Henry ; Todaro Mark, High pressure, high temperature window assembly and method of making the same.
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