Patent US4327697A successfully refreshed from Google Patents.
US4327697A
Expired / Lapsed
US
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Heater for air-fuel mixture having heating element of positive temperature coefficient resistor
Assignee: NGK Insulators Ltd
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Filing: 1980-04-29
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Granted: 1982-05-04
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Expires: 2000-04-29
Abstract
Abstract A heater for an air-fuel mixture having a heating element of a positive temperature coefficient resistor comprises a pair of metallic thin cylinders of different sizes each having outward flange portions at least at one end combined with each other as a double cylinder; a plurality of positive temperature coefficient resistors arranged between said inner and outer cylinders with springs for pressing the positive temperature coefficient resistors to the inner cylinder wall; an electric insulator plate inserted between the outward flange portions of said inner cylinder and the outward flange portions of said outer cylinder; a fixing means anchoring between said outward flange portion of the outer cylinder and said outward flange portion of the inner cylinder for fixing integrally with electric insulator plate; an electrically insulating material inserted between an inner end portion of the inner cylinder and an inner end portion of the outer cylinder for spacing between said inner end portion of the inner cylinder and said inner end portion of the outer cylinder with end gaps so as to insulate said inner end portions of said inner cylinder and outer cylinder. The engine with this heater can easily start and requires no fuel-rich mixture even in cold weather. As a result, an exhaust amount of carbon monoxide and hydrocarbon in exhaust gas can be remarkably reduced and an engine having excellent acceleration ability immediately after starting can be obtained.
Inventors
- 👤 Shigetaka Wada
- 👤 Toshio Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:29
CPC Classifications
F; F02; F02M; F02M29/00; F02M29/04; F02M31/00; F02M31/02; F02M31/12; F02M31/135; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
194 words
A heater for an air-fuel mixture having a heating element of a positive temperature coefficient resistor comprising; a pair of metallic thin cylinders of different sizes each having outward flange portions at least at one end combined with each other as a double cylinder provided with an inner cylinder and an outer cylinder; a plurality of positive temperature coefficient resistors arranged between said inner and outer cylinders with springs for pressing the positive temperature coefficient resistors to the inner cylinder wall; an electric insulator plate inserted between the outward flange portions of said inner cylinder and the outward flange portions of said outer cylinder; a fixing means anchoring between said outward flange portion of the outer cylinder and said outward flange portion of the inner cylinder for fixing integrally with electric insulator plate; an electrically insulating material inserted between an inner end portion of the inner cylinder and an inner end portion of the outer cylinder for spacing between said inner end portion of the inner cylinder and said inner end portion of the outer cylinder with end gaps so as to insulate said inner end portions of said inner cylinder and outer cylinder.
Claim 2
Dependent Claim
194 words
A heater for an air-fuel mixture having a heating element of a positive temperature coefficient resistor comprising; a pair of metallic thin cylinders of different sizes each having outward flange portions at least at one end combined with each other as a double cylinder provided with an inner cylinder and an outer cylinder; a plurality of positive temperature coefficient resistors arranged between said inner and outer cylinders with springs for pressing the positive temperature coefficient resistors to the inner cylinder wall; an electric insulator plate inserted between the outward flange portions of said inner cylinder and the outward flange portions of said outer cylinder; a fixing means anchoring between said outward flange portion of the outer cylinder and said outward flange portion of the inner cylinder for fixing integrally with electric insulator plate; an electrically insulating material inserted between an inner end portion of the inner cylinder and an inner end portion of the outer cylinder for spacing between said inner end portion of the inner cylinder and said inner end portion of the outer cylinder with end gaps so as to insulate said inner end portions of said inner cylinder and outer cylinder.
Claim 3
Dependent Claim
19 words
A heater for an air-fuel mixture is claimed in claim 1, wherein the metallic thin cylinder is press worked.
Claim 4
Dependent Claim
26 words
A heater for an air-fuel mixture as claimed in claim 2, wherein the press-worked metallic thin cylinder has a thickness of not more than 2 mm.
Claim 5
Dependent Claim
25 words
A heater for an air-fuel mixture as claimed in claim 3, wherein the thickness of the metallic thin cylinder is not more than 0.5 mm.
Claim 6
Dependent Claim
28 words
A heater for an air-fuel mixture as claimed in claim 1, wherein the inner cylinder is made of aluminum and the outer cylinder is made of stainless steel.
Claim 7
Dependent Claim
30 words
A heater for an air-fuel mixture as claimed in claim 1, wherein the outer peripheral wall surface of the inner cylinder is a polygon provided with a plurality of planes.
Claim 8
Dependent Claim
25 words
A heater for an air-fuel mixture as claimed in claim 1, wherein the plurality of positive temperature coefficient resistors are semiconductive barium titanate series ceramics.
Claim 9
Dependent Claim
22 words
A heater for an air-fuel mixture as claimed in claim 7, wherein the positive temperature coefficient resistors are not less than four.
Claim 10
Dependent Claim
21 words
A heater for an air-fuel mixture as claimed in claim 8, wherein the positive temperature coefficient resistors are more than eight.
Claim 11
Dependent Claim
26 words
A heater for an air-fuel mixture as claimed in claim 7, wherein the positive temperature coefficient resistors are plate-shaped and provided with electrodes on both surfaces.
Claim 12
Dependent Claim
25 words
A heater for an air-fuel mixture as claimed in claim 10, wherein a thickness of the positive temperature coefficient resistor is 0.5 to 2 mm.
Claim 13
Dependent Claim
25 words
A heater for an air-fuel mixture as claimed in claim 11, wherein the thickness of the positive temperature coefficient resistor is 0.5 to 1 mm.
Claim 14
Dependent Claim
29 words
A heater for an air-fuel mixture as claimed in claim 1, wherein an electroconductive and heat-conductive material is interposed between the inner cylinder and the positive temperature coefficient resistor.
Claim 15
Dependent Claim
26 words
A heater for an air-fuel mixture as claimed in claim 1, wherein a pair of flanges are anchored to one surface of the electric insulator plate.
Claim 16
Dependent Claim
31 words
A heater for an air-fuel mixture as claimed in claim 1, wherein an inlet opening of the inner cylinder for the air-fuel mixture is made larger than an outlet opening thereof.
Claim 17
Dependent Claim
29 words
A heater for an air-fuel mixture as claimed in claim 1, wherein a dissipater thermally coupled to the inner cylinder is provided in the inside of the inner cylinder.
Claim 18
Dependent Claim
33 words
A heater for an air-fuel mixture as claimed in claim 1, wherein a screen mesh member for dispersing the air-fuel mixture is provided in the free end of the inner or outer cylinder.
Claim 19
Dependent Claim
46 words
A heater for an air-fuel mixture as claimed in claim 1, wherein the free end surface having no outward flanges of the outer cylinder or the inner cylinder are provided with a plate having a plurality of through holes for heat dissipation and air-fuel mixture dispersion.
Claim 20
Dependent Claim
20 words
A heater for an air-fuel mixture as claimed in claim 1, wherein the air-fuel mixture consists of air and gasoline.
Claim 21
Dependent Claim
62 words
A heater for an air-fuel mixture as claimed in claim 1, wherein said heater having heating element of the positive temperature coefficient resistor is provided with a heat insulator plate and said heat insulator plate is fitted between a carburetor and an intake manifold of an internal combustion engine so as to disclose said heater in the pass of the air-fuel mixture.
Claim 22
Dependent Claim
41 words
A heater for an air-fuel mixture as claimed in claim 20, wherein said heat insulator plate attached to said heater and fixed between the carburetor and the intake manifold of the internal combustion engine with said heater is an electric insulator.
Claim 23
Dependent Claim
41 words
A heater for an air-fuel mixture as claimed in claim 20, wherein the heater is fitted to the heat insulator inserted between the carburetor and the intake manifold for the internal combustion engine and disclosed in the pass of air-fuel mixture.
Claim 24
Dependent Claim
26 words
A heater for an air-fuel mixture as claimed in claim 1, wherein an inner surface temperature of the inner cylinder is not less than 80° C.
Claim 25
Dependent Claim
27 words
A heater for an air-fuel mixture as claimed in claim 1, wherein a Curie temperature of the positive temperature coefficient resistor is 120° C. to 230° C.
Claim 26
Dependent Claim
27 words
A heater for an air-fuel mixture as claimed in claim 1, wherein the Curie temperature of the positive temperature coefficient resistor is 150° C. to 210° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |