US4339320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heated gas composition sensor structure
Assignee: Robert Bosch GmbH
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Filing: 1980-10-06
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Granted: 1982-07-13
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Expires: 2000-10-06
Abstract
Abstract To permit efficient heat transfer from a carrier tube (22) surrounding a tubular solid electrolyte body (11') having outer and inner electrodes (14, 18) applied thereto, the tubular heater element carrier body (22) supports a wire or resistance track heating element (25) at the inner surface thereof, the heater element (25) being spaced from the outer surface of the solid electrolyte tube (11') forming part of the sensor element (11) by a distance at the most of 1 mm, preferably less than 0.5 mm, the wall thickness of the heater element carrier tube (22) preferably being between 0.3 and 0.8 mm thick, the carrier tube being made of ceramic, such as aluminum oxide, or internally insulated metal.
Inventors
- 👤 Karl-Hermann Friese
- 👤 Friedrich Esper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:25
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4077; G01N27/4067
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
Heated gas composition sensor structure, particularly to determine the composition of combustion exhaust gases, especially for association with an internal combustion engine having a sensing element (11) made of temperature-dependent ceramic including a solid electrolyte body (11') of tubular form, and electrodes (14, 18) applied to different surface regions of said tubular body; and a heating element (25) to heat the sensor element (11) including a tubular carrier (22) surrounding the sensor element, wherein the wall thickness of the tubular carrier (22) is between 0.3 and 0.8 mm; the heating element (25) is secured to the inner wall of the tubular carrier (22); and the distance between the inner wall of the heating element and the outer surface of the sensing element (11) is, as a maximum, 1 mm.
Claim 2
Dependent Claim
129 words
Heated gas composition sensor structure, particularly to determine the composition of combustion exhaust gases, especially for association with an internal combustion engine having a sensing element (11) made of temperature-dependent ceramic including a solid electrolyte body (11') of tubular form, and electrodes (14, 18) applied to different surface regions of said tubular body; and a heating element (25) to heat the sensor element (11) including a tubular carrier (22) surrounding the sensor element, wherein the wall thickness of the tubular carrier (22) is between 0.3 and 0.8 mm; the heating element (25) is secured to the inner wall of the tubular carrier (22); and the distance between the inner wall of the heating element and the outer surface of the sensing element (11) is, as a maximum, 1 mm.
Claim 3
Dependent Claim
28 words
Sensor structure according to claim 1, wherein said distance between the heating element (25) and the outer surface of the sensing element (11) is less than 0.5 mm.
Claim 4
Dependent Claim
14 words
Sensor structure according to claim 1, wherein the carrier tube comprises an insulating ceramic.
Claim 5
Dependent Claim
33 words
Sensor structure according to claim 1 or 2 or 3, wherein the heater element (25) is positioned at the inner surface (21) of the carrier tube (22) in a spiral or meander-shaped path.
Claim 6
Dependent Claim
14 words
Sensor structure according to claim 4, wherein the heater element (25) comprises a wire.
Claim 7
Dependent Claim
50 words
Sensor structure according to claim 4, wherein the tubular carrier (22) is formed with a bottom (23) at the end exposed to the gas to be analyzed, said bottom being formed with an aperture (25) to permit exposure of said solid electrolyte sensor (11) to the gas to be analyzed.
Claim 8
Dependent Claim
50 words
Sensor structure according to claim 1, wherein the tubular carrier (22) is formed with a bottom (23) at the end exposed to the gas to be analyzed, said bottom being formed with an aperture (25) to permit exposure of said solid electrolyte sensor (11) to the gas to be analyzed.
Claim 9
Dependent Claim
61 words
Sensor structure according to claim 1, wherein the tubular carrier (22) for the heater element (25) is formed with a shoulder (28); a socket (32) is provided formed with a matching shoulder (30) surrounding a central bore (31); and a sealing element (29) is provided, located between the shoulder (30) of the socket and the shoulder (28) on the tubular carrier.
Claim 10
Dependent Claim
62 words
Sensor structure according to claim 8, wherein the solid electrolyte body (11') is formed with a flange matching the shoulder (28) on the tubular carrier (22) for the heater element; and a sealing element (19) is provided, positioned between the flange (13) of the solid electrolyte body (11') and the surface (20) of the shoulder of the heater element carrier tube (22).
Claim 11
Dependent Claim
15 words
Sensor structure according to claim 9, wherein the tubular carrier (22) comprises an insulating ceramic.
Claim 12
Dependent Claim
49 words
Sensor structure according to claim 1, wherein the distance between the heating element (25) and the outer surface of the sensing element (11) is less than 0.5 mm; the wall thickness of the tubular carrier (22) is about 0.6 mm; and the tubular carrier (22) comprises an insulating ceramic.
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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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |