Patent EP0197694A1 successfully refreshed from Google Patents.
EP0197694A1
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A metal-ceramic combination
Assignee: NGK Insulators Ltd
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Filing: 1986-03-24
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Granted: —
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Expires: 2006-03-24
Abstract
Abstract A metal-ceramic combination has a monobloc ceramic member comprising a base portion (1), a protrusion (4) on the base (1) and an easement portion on and around the root of the protrusion of increasing diameter towards the base. This ceramic member is combined with a metallic member 4 by fitting the protrusion tightly into a recess or bore of the metallic member. High bending strength of the combination is obtained by leaving a clearance (L,) of 0.5 mm or more between the start (6) of the easement portion and the edge (5) of joint interface of the two members. The combination of the invention is particularly useful for engine parts to be subjected to high temperatures and repeated stresses such as a turbocharger rotor, piston, tappet, rocker arm, exhaust valve, cam and the like.
Inventors
- 👤 Isao Oda
- 👤 Yoshihiko Ishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 08:22
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/025; F01L; F01L1/00; F01L1/12; F01L1/14; F01L3/00; F01L3/02; F02; F02F; F02F7/00; F02F7/0085; F02F7/0087; F16; F16B; F16B4/00; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/0852; F16D1/0858; F05; F05D; F05D2300/00; F05D2300/10; F05D2300/12; F05D2300/121; F05D2300/20; F05D2300/21; F05D2300/2118; F16B2200/00; F16B2200/85
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A metal-ceramic combination wherein a monobloc ceramic member comprising a base portion (1), a protrusion (4) extending from the base and an easement portion having its cross-sectional area gradually increasing towards the base (1) formed on and around the root of the protrusion (4) is combined with a metallic member (2) by fitting the said protrusion (4) into and or bonding it with a recess or bore of the metallic member, characterized in that there is a clearance (L 1 ) of 0.5 mm or more between the edge (5) of joint interface as herein defined and the beginning point (6) of the easement as herein defined.
Claim 2
Dependent Claim
107 words
A metal-ceramic combination wherein a monobloc ceramic member comprising a base portion (1), a protrusion (4) extending from the base and an easement portion having its cross-sectional area gradually increasing towards the base (1) formed on and around the root of the protrusion (4) is combined with a metallic member (2) by fitting the said protrusion (4) into and or bonding it with a recess or bore of the metallic member, characterized in that there is a clearance (L 1 ) of 0.5 mm or more between the edge (5) of joint interface as herein defined and the beginning point (6) of the easement as herein defined.
Claim 3
Dependent Claim
19 words
A metal-ceramic combination as claimed in claim 1, wherein the clearance ( Ll ) is 1.0 mm or more.
Claim 4
Dependent Claim
30 words
A metal-ceramic combination as claimed in claim 1 or claim 2, wherein the ceramic member comprises at least one of silicon nitride, silicon carbide, SIALON, zirconia, mullite, alumina and beryllia.
Claim 5
Dependent Claim
52 words
A metal-ceramic combination as claimed in any one of claims 1 to 3, wherein the ceramic member is a part of the revolving shaft, at the turbine wheel side, of a turbocharger rotor and the metallic member is a part of the shaft, at the compressor wheel side, of the turbocharger rotor.
Claim 6
Dependent Claim
36 words
A metal-ceramic combination as claimed in any one of claims 1 to 4, wherein at least a part of the metallic member has been hardened by precipitation hardening, nitriding or induction hardening or a combination thereof.
Claim 7
Dependent Claim
36 words
A metal-ceramic combination as claimed in claim 5, wherein the metallic member is of at least one metal selected from stainless steels, nickel-chrome-molybden steels, chrome-molybden steels, aluminum-chrome-molybden steels, maraging steels and precipitation hardening type super alloys.
Claim 8
Dependent Claim
45 words
A metal-ceramic combination as claimed in any one of claims 1 to 3, wherein the ceramic member forms part of the cam-contact portion of a tappet and the metallic member is a tappet body or a member joining the ceramic member to a tappet body.
Claim 9
Dependent Claim
41 words
A metal-ceramic combination as claimed in any one of claims 1 to 3, wherein the ceramic member is at least a part of valve body of an exhaust valve and the metallic member is a valve stem of the exhaust valve.
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