US4616612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine piston
Assignee: Perkins Engines Group Ltd
•
Filing: 1984-06-25
•
Granted: 1986-10-14
•
Expires: 2004-06-25
Abstract
Abstract In an internal combustion engine comprising a piston (1) having a combustion bowl (3) recessed in the crown of the piston and a plurality of arcuate recesses (7) formed in the side wall (6) of the bowl spaced apart by arcuate intermediate portions of the side wall, swirl means to cause the inlet air to rotate about the axis of the bowl, and fuel injection means (2) that serves to direct a plurality of fuel jets radially of the bowl each towards a corresponding recess (7), the piston is characterized in that the ratio of the maximum distance by which each recess (7) extends radially into the side wall (6) compared with the radius of the side wall (6), lies within the range 0.10 to 0.20.
Inventors
- 👤 Phillip A. Jane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:04
CPC Classifications
F; F02; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0645; F02B23/0648; F02B23/0651; F02B23/0669; F02B23/0678; F02B23/0696; F02B2275/00; F02B2275/14; F02B2275/40; F02B23/0618; F02B23/0621; F02B23/0624; F02B23/0681; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
An internal combustion engine piston having a combustion bowl recessed in the crown of the piston and a plurality of recesses formed in the side wall of the bowl so as to extend substantially the full depth of the bowl and which are arcuate in cross-section and spaced apart by arcuate intermediate portions of the side wall, characterised in that the ratio of the maximum distance by which each recess (7) extends radially into the side wall (6) compared with the radius of the side wall (6), lies within the range of 0.10 to 0.20.
Claim 2
Dependent Claim
95 words
An internal combustion engine piston having a combustion bowl recessed in the crown of the piston and a plurality of recesses formed in the side wall of the bowl so as to extend substantially the full depth of the bowl and which are arcuate in cross-section and spaced apart by arcuate intermediate portions of the side wall, characterised in that the ratio of the maximum distance by which each recess (7) extends radially into the side wall (6) compared with the radius of the side wall (6), lies within the range of 0.10 to 0.20.
Claim 3
Dependent Claim
35 words
A piston as claimed in claim 1 in which each of said recesses has an arcuate wall that lies on the arc of a circle in the plane normal to the axis of the bowl.
Claim 4
Dependent Claim
18 words
A piston as claimed in claim 2 in which the centres of said arcs lie on a circle.
Claim 5
Dependent Claim
25 words
A piston as claimed in claim 3 in which the centres of said arcs lie on a circle within the side wall of the bowl.
Claim 6
Dependent Claim
31 words
A piston as claimed in claim 1 in which the side wall of the bowl is generally cylindrical and each of the recesses extends parallel to the axis of the bowl.
Claim 7
Dependent Claim
53 words
An internal combustion engine comprising a piston as claimed in claim 1, swirl means to cause the inlet air to swirl about the axis of the bowl, and fuel injection means that serves to direct a plurality of fuel jets radially of the bowl each towards the central region of a corresponding recess.
References Cited (Backward Citations)
GB509838A
Cited
GB1012924A
Cited
US3374773A
Cited
DE2407783A1
Cited
US4176628A
Cited
DE3004580A1
Cited
US4538566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |