Patent US3749072A successfully refreshed from Google Patents.
US3749072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine cylinder liners
Assignee: Chromium Corp
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Filing: 1971-03-08
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Granted: 1973-07-31
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Expires: 1991-03-08
Abstract
Abstract A lining is provided for an internal combustion engine cylinder in which different degrees of roughness are imparted to those portions of the lands of the liner surface subjected to low and high pressures. The lands of the low pressure portions of the cylinder liner have a high degree of roughness for providing lubrication pockets for cooling the compression rings and for providing lapping of the rings during break-in so as to conform those surfaces in relative movement with each other. The lands of the high pressure portions of the cylinder liner have a low degree of roughness for reducing the oil retaining capacity thereof adjacent the combustion chamber for in turn eliminating the burning of lubricating oil while simultaneously presenting a relatively smooth surface to the compression rings during the time they are under high pressure in order to eliminate cocking of the rings and scoring of the liner.
Inventors
- 👤 E Schweikher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:26
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/18; F02F1/20; F02B; F02B79/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
In an internal combustion engine cylinder of the character described which provides enhanced wear characteristics and reduced lubrication oil consumption, said internal combustion engine cylinder having a bore extending therethrough, the combination which comprises a liner disposed in said bore and extending over the entire surface area thereof, and the degree of roughness of the lands of said liner surface in the high pressure end of said cylinder being lowEr than the degree of roughness in the low pressure end thereof.
Claim 2
Dependent Claim
81 words
In an internal combustion engine cylinder of the character described which provides enhanced wear characteristics and reduced lubrication oil consumption, said internal combustion engine cylinder having a bore extending therethrough, the combination which comprises a liner disposed in said bore and extending over the entire surface area thereof, and the degree of roughness of the lands of said liner surface in the high pressure end of said cylinder being lowEr than the degree of roughness in the low pressure end thereof.
Claim 3
Dependent Claim
16 words
An internal combustion engine cylinder as claimed in claim 1 in which said liner is metallic.
Claim 4
Dependent Claim
43 words
An internal combustion engine cylinder as claimed in claim 1 in which the roughness of the lands of the said liner surface in the high pressure end of the said cylinder is within the range of between about 0.025-0.375 microns root mean square.
Claim 5
Dependent Claim
42 words
An internal combustion engine cylinder as claimed in claim 1 in which the roughness of the lands of the said liner surface in the low pressure end of said cylinder is within the range of between about 0.375-2.0 microns root mean square.
Claim 6
Dependent Claim
74 words
An internal combustion engine cylinder as claimed in Claim 1 in which the roughness of the lands of the said liner surface in the high pressure end of said cylinder is within the range of between about 0.025-0.375 microns root mean square, and the roughness of the lands of the said liner surface in the low pressure end of the said cylinder is within the range of between about 0.375-2.0 microns root mean square.
Claim 7
Dependent Claim
71 words
An internal combustion engine cylinder as claimed in claim 1 in which the dividing line between the said high roughness and low roughness portions of the said liner is at that point where the compression ring most closely adjacent the high pressure end of the said cylinder will be at substantially the moment during a cycle of movement of a piston in said cylinder when all the ports thereof are closed.
Claim 8
Dependent Claim
16 words
An internal combustion engine cylinder as claimed in claim 1 in which said liner is chromium.
Claim 9
Dependent Claim
40 words
An internal combustion engine cylinder as claimed in claim 3 in which the roughness of the said liner surface in the high pressure end of the said cylinder is within the range of between about 0.075-0.250 microns root mean square.
Claim 10
Dependent Claim
40 words
An internal combustion engine cylinder as claimed in Claim 4 in which the roughness of the said liner surface in the low pressure end of the said cylinder is within the range of between about 0.750-1.25 microns root mean square.
Claim 11
Dependent Claim
68 words
An internal combustion engine cylinder as claimed in claim 5 in which the roughness of the said liner surface in the high pressure end of said cylinder is within the range of between about 0.075-0.250 microns root mean square, and the roughness of the said liner surface in the low pressure end of the said cylinder is within the range of between about 0.750-1.25 microns root mean square.
Claim 12
Dependent Claim
66 words
An internal combustion engine cylinder as claimed in claim 6 in which the roughness of the said liner in the high pressure end of said cylinder is within the range of between about 0.075-0.250 microns root mean square, and the roughness of the said liner in the low pressure end of the said cylinder is within the range of between about 0.750-1.25 microns root mean square.
Claim 13
Dependent Claim
16 words
An internal combustion engine cylinder as claimed in claim 11 in which said liner is chromium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |