US5169162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring having a function which is for facilitating supply of lubricating oil into an annular groove of a piston
Assignee: Sanden Corp
•
Filing: 1992-04-29
•
Granted: 1992-12-08
•
Expires: 2012-04-29
Abstract
Abstract For carrying out lubrication between a piston (17) and a piston ring (21) installed in an annular groove (23) of the piston, the piston ring comprises a recessed portion (15a, 15b) which is partially recessed from an upper axial end (27) of the piston ring. Lubricating oil is mixed with blow-by gas and flows into the annular groove through the recessed portion. As a result, the lubricating oil is effectively supplied to the annular groove. Therefore, the lubrication is favorably carried out between the piston ring and the piston. The piston ring may be formed from a piston ring member (10) of a ring-shaped plate which has the recessed portion on an outer peripheral surface (13) thereof.
Inventors
- 👤 Katsumasa Azaml
- 👤 Takeo Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:05
CPC Classifications
F; F16; F16J; F16J9/00; F04; F04B; F04B39/00; F04B39/04; F04B39/041; F04B39/042; F16J9/08; F16J9/12; F16J9/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
187 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein before being positioned in said annular groove said piston ring comprises a first flat surface, a second flat surface parallel to said first flat surface, an outer peripheral surface, and an inner peripheral surface parallel to and concentric with said outer peripheral surface, wherein the improvement comprises: an outer recessed portion which is at least partially formed at said outer peripheral surface of said piston ring, an inner recessed portion which is at least partially formed at said inner peripheral surface of said piston ring, said recessed portions directing lubricant through said space between said annular groove and said piston ring, and an additional recessed portion formed at said outer peripheral surface, said additional recessed portion extending along said outer peripheral surface from said first flat surface to said second flat surface. wherein said piston ring has a substantially rectangular cross section.
Claim 2
Dependent Claim
187 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein before being positioned in said annular groove said piston ring comprises a first flat surface, a second flat surface parallel to said first flat surface, an outer peripheral surface, and an inner peripheral surface parallel to and concentric with said outer peripheral surface, wherein the improvement comprises: an outer recessed portion which is at least partially formed at said outer peripheral surface of said piston ring, an inner recessed portion which is at least partially formed at said inner peripheral surface of said piston ring, said recessed portions directing lubricant through said space between said annular groove and said piston ring, and an additional recessed portion formed at said outer peripheral surface, said additional recessed portion extending along said outer peripheral surface from said first flat surface to said second flat surface. wherein said piston ring has a substantially rectangular cross section.
Claim 3
Dependent Claim
44 words
A piston ring assembly as claimed in claim 1, wherein said outer and inner recessed portions extend along said outer and inner peripheral surfaces, respectively, from said first flat surface to an intermediate position which is between said first and said second flat surfaces.
Claim 4
Dependent Claim
30 words
A piston ring assembly as claimed in claim 1, further comprising a groove portion extending along said first flat surface from said outer recessed portion to said inner recessed portion.
Claim 5
Dependent Claim
211 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein when positioned in said annular groove said piston ring comprises an outer and in inner cylindrical surface which are approximately parallel, and a first and a second axial end which are parallel, said first axial end having a first diameter, said second axial end having a second diameter which is less than said first diameter, wherein the improvement comprises: a first recessed portion which is at least partially formed at said first axial end of said piston ring, a second recessed portion which is at least partially formed at said second axial end of said piston ring, said first and second recessed portions directing lubricant through said space between said annular groove and said piston ring, and an additional recessed portion which is at least partially formed at said first axial end along said first cylindrical surface, said additional recessed portion extending along said first axial end from said inner cylindrical surface to an intermediate position which is between said inner and said outer cylindrical surfaces.
Claim 6
Dependent Claim
211 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein when positioned in said annular groove said piston ring comprises an outer and in inner cylindrical surface which are approximately parallel, and a first and a second axial end which are parallel, said first axial end having a first diameter, said second axial end having a second diameter which is less than said first diameter, wherein the improvement comprises: a first recessed portion which is at least partially formed at said first axial end of said piston ring, a second recessed portion which is at least partially formed at said second axial end of said piston ring, said first and second recessed portions directing lubricant through said space between said annular groove and said piston ring, and an additional recessed portion which is at least partially formed at said first axial end along said first cylindrical surface, said additional recessed portion extending along said first axial end from said inner cylindrical surface to an intermediate position which is between said inner and said outer cylindrical surfaces.
Claim 7
Dependent Claim
34 words
A piston ring as claimed in claim 4, wherein said first and second recessed portions extend along said first and second axial ends, respectively, from said inner cylindrical surface to said outer cylindrical surface.
Claim 8
Dependent Claim
29 words
A piston ring as claimed in claim 4, wherein said additional recessed portion extends along said first axial end from said inner cylindrical surface to said outer cylindrical surface.
Claim 9
Dependent Claim
184 words
A piston assembly comprising: a piston member having an outer annular surface and at least one groove formed in said outer annular surface, said groove being defined by a bottom surface and side surfaces; and a piston ring having a rectangular cross section before being positioned in said annular groove, wherein when positioned in said annular groove said piston ring comprising an outer cylindrical surface, an inner cylindrical surface approximately parallel to said outer cylindrical surface, a first axial end, and a second axial end parallel to said first axial end, said piston ring being positioned in said annular groove so that a space extends along a portion of facing surfaces of said inner cylindrical surface and said bottom surface of said annular groove, said piston ring having a recessed portion at least partially formed at said first axial end, said at least partially formed recessed portion extending along said first axial end from said inner cylindrical surface to an intermediate position which is between said inner and said outer cylindrical surfaces, said at least partially formed recessed portion directing lubricant through said space.
Claim 10
Dependent Claim
184 words
A piston assembly comprising: a piston member having an outer annular surface and at least one groove formed in said outer annular surface, said groove being defined by a bottom surface and side surfaces; and a piston ring having a rectangular cross section before being positioned in said annular groove, wherein when positioned in said annular groove said piston ring comprising an outer cylindrical surface, an inner cylindrical surface approximately parallel to said outer cylindrical surface, a first axial end, and a second axial end parallel to said first axial end, said piston ring being positioned in said annular groove so that a space extends along a portion of facing surfaces of said inner cylindrical surface and said bottom surface of said annular groove, said piston ring having a recessed portion at least partially formed at said first axial end, said at least partially formed recessed portion extending along said first axial end from said inner cylindrical surface to an intermediate position which is between said inner and said outer cylindrical surfaces, said at least partially formed recessed portion directing lubricant through said space.
Claim 11
Dependent Claim
33 words
A piston assembly as claimed in claim 7, wherein said first axial end has a first diameter and said second axial end has a second diameter which is less than said first diameter.
Claim 12
Dependent Claim
37 words
A piston assembly as claimed in claim 8, wherein said first axial end extends beyond said side surfaces of said annular groove and said second axial end is disposed within said side surfaces of said annular groove.
Claim 13
Dependent Claim
33 words
A piston assembly as claimed in claim 7, wherein said at least partially formed recessed portion further extends along said first axial end from said inner cylindrical surface to said outer cylindrical surface.
Claim 14
Dependent Claim
25 words
A piston assembly as claimed in claim 10, wherein said recessed portion extends along a meander line between said outer and said inner cylindrical surfaces.
Claim 15
Dependent Claim
24 words
A piston assembly as claimed in claim 10, wherein said recessed portion extends at an angle between said inner and said outer cylindrical surfaces.
Claim 16
Dependent Claim
20 words
A piston assembly as claimed in claim 7, wherein said at least partially formed recessed portion has a trapezoidal form.
Claim 17
Dependent Claim
20 words
A piston assembly as claimed in claim 7, wherein said at least partially formed recessed portion has a rectangular form.
Claim 18
Dependent Claim
28 words
A piston assembly as claimed in claim 7, wherein said piston ring is formed with an additional recessed portion at least partially formed at said first axial end.
Claim 19
Dependent Claim
29 words
A piston assembly as claimed in claim 15, wherein said additional recessed portion extends along said first axial end from said inner cylindrical surface to said outer cylindrical surface.
Claim 20
Dependent Claim
38 words
A piston assembly as claimed in claim 15, wherein said additional recessed portion extends along said first axial end from said inner cylindrical surface to an intermediate position which is between said inner and said outer cylindrical surfaces.
Claim 21
Dependent Claim
28 words
A piston assembly as claimed in claim 7, wherein said piston ring is formed with an additional recessed portion at least partially formed at said second axial end.
Claim 22
Dependent Claim
33 words
A piston assembly as claimed in claim 7, wherein said piston ring is formed with a groove portion extending along said inner cylindrical surface from said recessed portion to said second axial end.
Claim 23
Dependent Claim
173 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein before being positioned in said annular groove said piston ring comprises a first flat surface, a second flat surface parallel to said first flat surface, an outer peripheral surface, and an inner peripheral surface parallel to and concentric with said outer peripheral surface, wherein the improvement comprises: an outer recessed portion formed at said outer peripheral surface of said piston ring, and an inner recessed portion formed at said inner peripheral surface of said piston ring, said recessed portions directing lubricant through said space between said annular groove and said piston ring, said outer and inner recessed portions extending along said outer and inner peripheral surfaces, relatively, from said first flat surface to said second flat surface; and wherein said piston ring has a substantially rectangular cross section.
Claim 24
Dependent Claim
173 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein before being positioned in said annular groove said piston ring comprises a first flat surface, a second flat surface parallel to said first flat surface, an outer peripheral surface, and an inner peripheral surface parallel to and concentric with said outer peripheral surface, wherein the improvement comprises: an outer recessed portion formed at said outer peripheral surface of said piston ring, and an inner recessed portion formed at said inner peripheral surface of said piston ring, said recessed portions directing lubricant through said space between said annular groove and said piston ring, said outer and inner recessed portions extending along said outer and inner peripheral surfaces, relatively, from said first flat surface to said second flat surface; and wherein said piston ring has a substantially rectangular cross section.
Claim 25
Dependent Claim
213 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annual groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein when positioned in said annular groove said piston ring comprises an outer and an inner cylindrical surface which are approximately parallel, and a first and a second axial end which are parallel, said first axial end having a first diameter, said second axial end having a second diameter which is less than said first diameter, wherein the improvement comprises: a first recessed portion which is at least partially formed at said first axial end of said piston ring, and a second recessed portion which is at least partially formed at said second axial end of said piston ring, said first and second recessed portions extending along said first and second axial ends, respectively, from said inner cylindrical surface to an intermediate position which is between said inner and said outer cylindrical surfaces, said first and second recessed portions directing lubricant through said space between said annular groove and said piston ring, wherein said piston ring has a substantially rectangular cross section before being positioned in said annular groove.
Claim 26
Dependent Claim
213 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annual groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein when positioned in said annular groove said piston ring comprises an outer and an inner cylindrical surface which are approximately parallel, and a first and a second axial end which are parallel, said first axial end having a first diameter, said second axial end having a second diameter which is less than said first diameter, wherein the improvement comprises: a first recessed portion which is at least partially formed at said first axial end of said piston ring, and a second recessed portion which is at least partially formed at said second axial end of said piston ring, said first and second recessed portions extending along said first and second axial ends, respectively, from said inner cylindrical surface to an intermediate position which is between said inner and said outer cylindrical surfaces, said first and second recessed portions directing lubricant through said space between said annular groove and said piston ring, wherein said piston ring has a substantially rectangular cross section before being positioned in said annular groove.
Claim 27
Dependent Claim
198 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein when positioned in said annular groove said piston ring comprises an outer and an inner cylindrical surface which are approximately parallel, and a first and a second axial end which are parallel, said first axial end having a first diameter, said second axial end having a second diameter which is less than said first diameter, wherein the improvement comprises: a first recessed portion which is at least partially formed at said first axial end of said piston ring, a second recessed portion which is at least partially formed at said second axial end of said piston ring, said first and second recessed portions directing lubricant through said space between said annular groove and said piston ring, and a groove portion extending along said inner cylindrical surface from said first recessed portion to said second recessed portion, wherein said piston ring has a substantially rectangular cross section before being positioned in said annular groove.
Claim 28
Dependent Claim
198 words
A piston ring assembly having a piston member, at least one annular groove in said piston member, a piston ring positioned in said annular groove so that a space extends along a portion of facing surfaces of said annular groove and said piston ring, wherein when positioned in said annular groove said piston ring comprises an outer and an inner cylindrical surface which are approximately parallel, and a first and a second axial end which are parallel, said first axial end having a first diameter, said second axial end having a second diameter which is less than said first diameter, wherein the improvement comprises: a first recessed portion which is at least partially formed at said first axial end of said piston ring, a second recessed portion which is at least partially formed at said second axial end of said piston ring, said first and second recessed portions directing lubricant through said space between said annular groove and said piston ring, and a groove portion extending along said inner cylindrical surface from said first recessed portion to said second recessed portion, wherein said piston ring has a substantially rectangular cross section before being positioned in said annular groove.
References Cited (Backward Citations)
CA613959A
Cited
US307334A
Cited
US1369592A
Cited
US1581312A
Cited
US1565299A
Cited
US1803309A
Cited
GB314865A
Cited
US1760122A
Cited
US1815354A
Cited
GB400106A
Cited
GB423981A
Cited
US2096003A
Cited
US2112103A
Cited
GB513932A
Cited
US2262311A
Cited
US2372979A
Cited
US2652298A
Cited
FR1193072A
Cited
US3214182A
Cited
US3396976A
Cited
US3359872A
Cited
US3831952A
Cited
US3698054A
Cited
US3851889A
Cited
US3920254A
Cited
JPS5465210A
Cited
US4594055A
Cited
EP0151777A1
Cited
US4697992A
Cited
US4681326A
Cited
US4835856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |