US3924580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Main combustion chamber of swirl chamber type diesel engine
Assignee: Toyota Motor Corp
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Filing: 1974-11-15
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Granted: 1975-12-09
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Expires: 1994-11-15
Abstract
Abstract A main combustion chamber that permits efficient combustion throughout the entire rotational speed range comprising a straight groove extending diametrically from an edge portion of the top surface of a piston and a pair of grooves branching right and left from amidst the straight groove in such a curved manner as to return toward the edge of the surface. The straight and curved grooves are formed in the top surface of a piston of a swirl chamber type diesel engine.
Inventors
- 👤 Kaoru Taira
- 👤 Hirotoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
F; F02; F02B; F02B23/00; F02B23/02; F02B23/04; F02B19/00; F02B19/08; F02F; F02F3/00; F02F3/26; F02B2275/00; F02B2275/16; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
In a swirl chamber type diesel engine having a cylinder with a piston slidable therein, a main combustion chamber defined in said piston, said main combustion chamber comprising a straight inclined groove formed in the top surface of said piston, said straight groove extending diametrically from an edge portion of said surface and becoming shallower as the groove extends inward from said edge portion, said main combustion chamber further comprising a pair of branched inclined grooves extending from said straight inclined groove, each one of said pair of grooves being curved and having a portion curving back toward said edge portion, and each one of said pair of grooves becoming shallower as it extends from said straight groove.
Claim 2
Dependent Claim
118 words
In a swirl chamber type diesel engine having a cylinder with a piston slidable therein, a main combustion chamber defined in said piston, said main combustion chamber comprising a straight inclined groove formed in the top surface of said piston, said straight groove extending diametrically from an edge portion of said surface and becoming shallower as the groove extends inward from said edge portion, said main combustion chamber further comprising a pair of branched inclined grooves extending from said straight inclined groove, each one of said pair of grooves being curved and having a portion curving back toward said edge portion, and each one of said pair of grooves becoming shallower as it extends from said straight groove.
Claim 3
Dependent Claim
34 words
In a diesel engine as claimed in claim 1, wherein: each one of said pair of grooves extends away from a respective one of the pair of opposing straight sides of said straight groove.
Claim 4
Dependent Claim
38 words
In a diesel engine as claimed in claim 2, wherein: each one of said pair of curved grooves extends from said straight groove in a direction away from said edge portion and curves back toward said edge portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |