US3683477A - Method of producing one-piece channel shaped piston ring - Google Patents

Method of producing one-piece channel shaped piston ring Download PDF

Info

Publication number
US3683477A
US3683477A US84705A US3683477DA US3683477A US 3683477 A US3683477 A US 3683477A US 84705 A US84705 A US 84705A US 3683477D A US3683477D A US 3683477DA US 3683477 A US3683477 A US 3683477A
Authority
US
United States
Prior art keywords
tape
ring
article
channel
oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US84705A
Inventor
Eisuke Sugahara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KOHDANJUTAKU
Original Assignee
KOHDANJUTAKU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KOHDANJUTAKU filed Critical KOHDANJUTAKU
Application granted granted Critical
Publication of US3683477A publication Critical patent/US3683477A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/08—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass piston rings from several pieces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • F16J9/203—Oil-scraping rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • F16J9/206—One-piece oil-scraping rings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/924—Deformation, material removal, or molding for manufacture of seal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49274—Piston ring or piston packing making
    • Y10T29/49279—Piston ring or piston packing making including rolling or die forming, e.g., drawing, punching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49274—Piston ring or piston packing making
    • Y10T29/49281—Piston ring or piston packing making including coating or plating

Definitions

  • Patent 51 3,683,477 Sugahara V 51 Aug. 15, 1972 [5 METHOD-OF PRODUCING ONE-PIECE 3,606,359 9/ 1971 McCormick ..277/224 CHANNEL SHAPED PISTON RING 72 lnventor: Eisuke Sugahara, c/o Kohdanjutaku g g ggl g ggi 1 52 abanedal Klta'ku Attorney-Sughrue, Rothwell, Mion, Zinn & Macpeak [22] Filed: I Oct. 28, 1970 [57] ABSTRACT [21] Appl.
  • the known one-piece oil rings or one-piece channel shaped piston rings are produced by punching a first plurality of same sized oil windows in a thin steel sheet tape at regular intervals along the centerline of steel sheet tape, cutting a plurality of lateral slits from the tape edges to the oil window alternately for every other window by a grinder, bending longitudinally the obtained steel sheet tape along two lines parallel to the centerline of the tape, into a channel shaped article, and forming the obtained channel shaped article into a ring of desired diameter.
  • the aforesaid slit cutting step requires much time and cost, and wrong slits are often cut at undesired portions of the steel sheet tape. Besides, as the slits terminate on a sliding face which is formed on an end of a sidewall of the channel, this causes an end effect while the sliding face is subject to the electrolytic Cr plating. This end effect is very detrimental to the Cr plating treatment, and accordingly the end face having the slits is hardly subjected to the Cr plating. By these reasons, the conventional channel shaped piston ring does not have favorable durability.
  • an object of this invention is to provide a novel slit cutting method with saving in cost and working time.
  • Another object of this invention is to eliminate the end effect when the outer surface of the piston ring, especially the sliding face, is subjected to the electrolytic plating treatment.
  • This invention also provides an improved channel shaped piston ring having Co-Mo plated layer on the sliding face with favorable durability.
  • FIG. 1 is a plan view of a steel sheet tape to be formed into the conventional channel shaped piston ring, having a plurality of punched oil windows and lateral slits therefrom, cut by the grinder,
  • FIG. 2 shows a lateral cross section of a conventional channel shaped piston ring
  • FIG. 3 is a cross section of a conventional assembly composed of a piston, a cylinder and the channel shaped piston ring inserted therebetween,
  • FIG. 4 is a plan view of a steel sheet tape to be formed into the channel shaped piston ring according to this invention, having a plurality of oil windows and slits which are punched in one step,
  • FIG. 5 shows a partly broken cross section of the steel article bent first to have C shaped cross section and then curled on a drum
  • FIGS. 60 and 6b are cross sections of an oil ring whose outer edges are coated with Co-W plating layer, according to this invention.
  • the steel sheet tape 1 has a plurality of rectangular oil windows 2 at regular intervals and lateral slits 3, 3' arranged alternately on respective sides of the tape 1. It is bent longitudinally along lines a-a to form the channel composed of a pair of side walls 4 and 5 and a bottom plate including the oil windows 2. End faces or edges 6 of both said side plates serve as the sliding faces.
  • This channel shaped article is cut into the desired length and bent into a ring form.
  • the obtained piston ring is inserted into an oil ring groove G of a piston so that the upper face 4 and the lower face 5 touch the groove walls and the sliding faces 6 are brought into contact with a surface of a cylinder c which is engaged by the piston.
  • This conventional channel shaped piston ring has aforesaid defects, and therefore an improved oil ring is produced according to this invention, which is described with reference to FIGS. 4-6.
  • a thin steel sheet tape 1 is first punched to form a plurality of oil windows 2 of the same size arranged at regular intervals and to form also, a plurality of relatively wide lateral slits 3, 3' which are provided alternately on both sides of the tape 1 and connect the oil window 2 with the tape edge. Then, the punched tape is bent along 2 lines a-a and a-a, both being parallel to the tape centerline X-X, to form a channel having the symmetrical C shaped cross section.
  • the obtained channel article is curled to form a ring having a diameter larger than that of the final oil ring product, and the curled article is inserted into a hollow cylinder having the inner diameter smaller than the curling diameter and heat treated therein.
  • an electrolytic Cr plating is applied to the outer surface of the curled article to coat a Cr layer 8' thereon.
  • the slit forming working is much simplified and the cutting of a wrong slit at an undesired point is fully eliminated.
  • the punched slit is wider as compared with the cut slit to reduce the spring characteristics of the resultant oil ring, but the width of the slit can be adjusted during the heat treatment to recover the spring characteristics of the oil ring.
  • the heat treatment is able to relieve the internal stress caused by the punching to recover the favorable mechanical properties, and the resultant oil ring exhibits mechanical stability for long periods of time.
  • the wider slits inhibit any formation of the end effect" during the Cr plating treatment, thus forming a favorable Cr plated layer on the outer edge surfaces of the oil ring. It is more advantageous to effect the brushing plating together with the Cr plating.
  • Co-W plating is applied to the outer surface of the curled channel shaped article prior to the heat treatment in the cylinder 8.
  • This heat treatment is conducted at 200-500 C. to obtain the C-W layer having a hardness of 800-1200 Hv.
  • a polishing treatment is not required. This is considered to be dependent on a fact that the uniform electric depositing property of the Co-W layer is excellent and the end effect is hardly present due to the relatively wide slits.
  • a method of producing a one-piece channel shaped piston ring comprising:
  • a method of producing a one-piece channel shaped piston ring comprising:

Abstract

This disclosure provides a novel method of producing a channel shaped piston ring in that a plurality of relatively wide lateral slits are formed by punching together with the oil windows to save time and cost and also to avoid an ''''end effect'''' during the electrolytic Cr or Co-W plating treatment of the edge of the ring. The method is carried out by punching a sheet tape to produce the plurality of slits and windows, bending the punched tape into a channel having a C-shaped cross section, curling the C-shaped channel into a ring of larger diameter than the final piston ring, and heat treating the ring after inserting it into a hollow cylinder having an inner diameter slightly smaller than the initial diameter of the curled article. The method is further characterized in that the Cr or Co-W plating of the edges of the ring is carried out either before or after the heat treatment.

Description

United States. Patent 51 3,683,477 Sugahara V 51 Aug. 15, 1972 [5 METHOD-OF PRODUCING ONE-PIECE 3,606,359 9/ 1971 McCormick ..277/224 CHANNEL SHAPED PISTON RING 72 lnventor: Eisuke Sugahara, c/o Kohdanjutaku g g ggl g ggi 1 52 abanedal Klta'ku Attorney-Sughrue, Rothwell, Mion, Zinn & Macpeak [22] Filed: I Oct. 28, 1970 [57] ABSTRACT [21] Appl. No.: 84,705 This disclosure provides a novel method of producing a channel shaped piston ring in that a plurality of relatively wide lateral slits are formed by punching [52] together with the oil windows to save time and cost [51] In CL 3323p 15,06 and also to avoid an end eflect" during the elec- [58] Field of Search ..29/l56.6, 156.63; 277/223, g s f zg f 277/224 2; 52% sheet tape to produce the plurality of slits and windows, bending the punched tape into a channel having a C-shaped cross section, curling the C-shaped chan- [56] Reierences C'ted nel into a ring of larger diameter than the final piston UNI D TA PATENTS i'linlg, and hlea:l treating the ring after (ijnserting it lingo a 0 ow cy 1n er aving an inner iameter s1g y 2,565,042 8/ I951 PhlllipS ..277/235 A X Smaller than the initial diameter f the curled article 2,696,038 l2/ I954 Hunt ..204/25 X The method i further characterized i that the or C0-W plating of the edges of the ring is carried out all e h ft h h It m L 3,539,192 11/1970 Prasse ..277/224 er er e ea rea en 3,586,544 6/1971 Geffroy ..29/ 156.6 2 Claims, 7 Drawing Figures r 2 1 r a q .j, x 0 Z METHOD OF PRODUCING ONE-PIECE CHANNEL SHAPED PISTON RING BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an improved one-piece channel shaped piston ring of the type shown in U.S. Pat. No. 2,932,543, and to a method of producing the same.
2. Description of the Prior Art The known one-piece oil rings or one-piece channel shaped piston rings are produced by punching a first plurality of same sized oil windows in a thin steel sheet tape at regular intervals along the centerline of steel sheet tape, cutting a plurality of lateral slits from the tape edges to the oil window alternately for every other window by a grinder, bending longitudinally the obtained steel sheet tape along two lines parallel to the centerline of the tape, into a channel shaped article, and forming the obtained channel shaped article into a ring of desired diameter.
The aforesaid slit cutting step requires much time and cost, and wrong slits are often cut at undesired portions of the steel sheet tape. Besides, as the slits terminate on a sliding face which is formed on an end of a sidewall of the channel, this causes an end effect while the sliding face is subject to the electrolytic Cr plating. This end effect is very detrimental to the Cr plating treatment, and accordingly the end face having the slits is hardly subjected to the Cr plating. By these reasons, the conventional channel shaped piston ring does not have favorable durability.
SUMMARY OF THE INVENTION Therefore, an object of this invention is to provide a novel slit cutting method with saving in cost and working time.
Another object of this invention is to eliminate the end effect when the outer surface of the piston ring, especially the sliding face, is subjected to the electrolytic plating treatment. This invention also provides an improved channel shaped piston ring having Co-Mo plated layer on the sliding face with favorable durability.
BRIEF DESCRIPTION OF THE DRAWINGS More specified embodiments of this invention will be described with reference to accompanied drawings, wherein:
FIG. 1 is a plan view of a steel sheet tape to be formed into the conventional channel shaped piston ring, having a plurality of punched oil windows and lateral slits therefrom, cut by the grinder,
FIG. 2 shows a lateral cross section of a conventional channel shaped piston ring,
FIG. 3 is a cross section of a conventional assembly composed of a piston, a cylinder and the channel shaped piston ring inserted therebetween,
FIG. 4 is a plan view of a steel sheet tape to be formed into the channel shaped piston ring according to this invention, having a plurality of oil windows and slits which are punched in one step,
FIG. 5 shows a partly broken cross section of the steel article bent first to have C shaped cross section and then curled on a drum, and
FIGS. 60 and 6b are cross sections of an oil ring whose outer edges are coated with Co-W plating layer, according to this invention.
Referring to FIGS. l-3, the conventional channel shaped piston ring and the method of producing the latter will be first described. The steel sheet tape 1 has a plurality of rectangular oil windows 2 at regular intervals and lateral slits 3, 3' arranged alternately on respective sides of the tape 1. It is bent longitudinally along lines a-a to form the channel composed of a pair of side walls 4 and 5 and a bottom plate including the oil windows 2. End faces or edges 6 of both said side plates serve as the sliding faces. This channel shaped article is cut into the desired length and bent into a ring form. The obtained piston ring is inserted into an oil ring groove G of a piston so that the upper face 4 and the lower face 5 touch the groove walls and the sliding faces 6 are brought into contact with a surface of a cylinder c which is engaged by the piston.
Thus, the excess oil stuck to the cylinder surface is scraped by the oil ring and drained through the oil windows 2 and oil ducts O in the piston into an oil pan, as shown in FIG. 3.
This conventional channel shaped piston ring has aforesaid defects, and therefore an improved oil ring is produced according to this invention, which is described with reference to FIGS. 4-6. A thin steel sheet tape 1 is first punched to form a plurality of oil windows 2 of the same size arranged at regular intervals and to form also, a plurality of relatively wide lateral slits 3, 3' which are provided alternately on both sides of the tape 1 and connect the oil window 2 with the tape edge. Then, the punched tape is bent along 2 lines a-a and a-a, both being parallel to the tape centerline X-X, to form a channel having the symmetrical C shaped cross section.
The obtained channel article is curled to form a ring having a diameter larger than that of the final oil ring product, and the curled article is inserted into a hollow cylinder having the inner diameter smaller than the curling diameter and heat treated therein.
After that, an electrolytic Cr plating is applied to the outer surface of the curled article to coat a Cr layer 8' thereon.
According to this method, as the oil windows 2 and the slit 3 are punched simultaneously in one step, the slit forming working is much simplified and the cutting of a wrong slit at an undesired point is fully eliminated. The punched slit is wider as compared with the cut slit to reduce the spring characteristics of the resultant oil ring, but the width of the slit can be adjusted during the heat treatment to recover the spring characteristics of the oil ring. Besides, the heat treatment is able to relieve the internal stress caused by the punching to recover the favorable mechanical properties, and the resultant oil ring exhibits mechanical stability for long periods of time.
On the other hand, the wider slits inhibit any formation of the end effect" during the Cr plating treatment, thus forming a favorable Cr plated layer on the outer edge surfaces of the oil ring. It is more advantageous to effect the brushing plating together with the Cr plating.
In another example of producing the oil ring, Co-W plating is applied to the outer surface of the curled channel shaped article prior to the heat treatment in the cylinder 8. This heat treatment is conducted at 200-500 C. to obtain the C-W layer having a hardness of 800-1200 Hv. As this Co-W plated layer is very smooth, a polishing treatment is not required. This is considered to be dependent on a fact that the uniform electric depositing property of the Co-W layer is excellent and the end effect is hardly present due to the relatively wide slits.
While this reference to particular embodiments thereof, it will be understood that the numerous modifications may be made by those skilled in the art without actually departing from the scope of this invention.
Therefore, the appended claims are intended to cover all such equivalent variations as coming within the true spirit and scope of the invention.
What is claimed is:
1. A method of producing a one-piece channel shaped piston ring comprising:
punching a plurality of oil windows of the same size,
arranged at regular intervals along a longitudinal centerline within a thin sheet steel tape and simultaneously, a plurality of relatively wide lateral slits alternately in every other window on respective sides of the tape with each of the oil windows connected to a respective tape edge,
bending the punched tape along two lines parallel to the tape centerline to form a channel having a symmetrical C shaped cross section,
curling the channel article into a ring having the diameter slightly larger than that of the final oil invention has been described with l0 ring product,
inserting the curled article into a hollow cylinder having an inner diameter slightly smaller than the initial diameter of the curled article,
heat-treating the curled article therein, and
subjecting the outer edge surfaces of the heat treated article to an electrolytic Cr plating treatment.
2. A method of producing a one-piece channel shaped piston ring comprising:
punching a thin steel sheet tape with a plurality of oil windows of the same size arranged at regular intervals along a longitudinal centerline of the tape and simultaneously with a plurality of relatively wide lateral slits provided alternately for every other window on both sides of the tape for connecting each of the oil windows to respective tape edges,
bending the punched tape along two lines in parallel to the longitudinal centerline of the tape to form a channel having the symmetrical C shaped cross section,
curling the channel article into a ring having a diameter slightly larger than that of the final oil ring product,
subjecting the outer edge surfaces of the curled article to a Co-W plating treatment,
inserting the Co-W plated article into a hollow cylinder having the inner diameter slightly smaller than the initial diameter of the Co-W plated article, and
heat-treating the plated article therein.
UNITED STATES PATENT OFFICE v 'CERTIFICATE OF CORRECTION Patent No. ,477 Dated August 15, 1972 Inventor) E'isuke Sugahara It is certified'that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
T The priority'date was omitted from the patent. It should be:
October 28, 1969 The Assignee's name was ornitt ed'from the patent. It should be:.
Nippon Piston Ring o. Ltd,
Signed and sealed this 1st day of May 1973.
(SEAL) Attsst:
EDL'JARD M. FLETCHER, ROBERT GOTTSCHAIK Attssting Officer Commissioner of. Patents uscoMM-Dc scan-P69 U,5. GOVERNMENT PRINTING OFFICE: I969 0-366-334 FORM PO-1050(10-69)

Claims (1)

  1. 2. A method of producing a one-piece channel shaped piston ring comprising: punching a thin steel sheet tape with a plurality of oil windows of the same size arranged at regular intervals along a longitudinal centerline of the tape and simultaneously with a plurality of relatively wide lateral slits provided alternately for every other window on both sides of the tape for connecting each of the oil windows to respective tape edges, bending the punched tape along two lines in parallel to the longitudinal centerline of the tape to form a channel having the symmetrical C shaped cross section, curling the channel article into a ring having a diameter slightly larger than that of the final oil ring product, subjecting the outer edge surfaces of the curled article to a Co-W plating treatment, inserting the Co-W plated article into a hollow cylinder having the inner diameter slightly smaller than the initial diameter of the Co-W plated article, and heat-treating the plated article therein.
US84705A 1970-10-28 1970-10-28 Method of producing one-piece channel shaped piston ring Expired - Lifetime US3683477A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8470570A 1970-10-28 1970-10-28

Publications (1)

Publication Number Publication Date
US3683477A true US3683477A (en) 1972-08-15

Family

ID=22186697

Family Applications (1)

Application Number Title Priority Date Filing Date
US84705A Expired - Lifetime US3683477A (en) 1970-10-28 1970-10-28 Method of producing one-piece channel shaped piston ring

Country Status (1)

Country Link
US (1) US3683477A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795403A (en) * 1970-10-29 1974-03-05 E Sugahara One-piece channel shaped piston ring
US4145060A (en) * 1975-12-20 1979-03-20 Goetze Ag Axially and radially clamping spreader ring for an oil scraping piston ring
US4548416A (en) * 1983-07-21 1985-10-22 Toyota Jidosha Kabushiki Kaisha Oil-ring including two rail rings and an expander-spacer ring which bites into the rail ring
US5398945A (en) * 1992-11-12 1995-03-21 Dana Corporation Piston ring of "Y" cross-section
US20020070507A1 (en) * 2002-01-18 2002-06-13 Stephane Heraud Piston oil ring having land flanked by concave sidewalls
US20150292621A1 (en) * 2012-10-31 2015-10-15 Mahle Metal Leve S/A Single-piece oil control ring
US20170036256A1 (en) * 2010-10-22 2017-02-09 Cyril Bath Company Structural component and method of manufacture

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565042A (en) * 1948-05-17 1951-08-21 Hastings Mfg Co Piston ring
US2696038A (en) * 1952-05-31 1954-12-07 Perfect Circle Corp Method of making chrome plated piston rings
US2742279A (en) * 1954-12-03 1956-04-17 Perfect Circle Corp Machine for heat-treating strip material
US3051633A (en) * 1959-03-16 1962-08-28 Sealed Power Corp Process of chromium plating vented piston rings
US3539192A (en) * 1968-01-09 1970-11-10 Ramsey Corp Plasma-coated piston rings
US3586544A (en) * 1966-07-20 1971-06-22 Mecanique De Pringy Soc D Method of producing piston rings
US3606359A (en) * 1969-08-08 1971-09-20 Ramsey Corp Tungsten carbide coated piston rings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565042A (en) * 1948-05-17 1951-08-21 Hastings Mfg Co Piston ring
US2696038A (en) * 1952-05-31 1954-12-07 Perfect Circle Corp Method of making chrome plated piston rings
US2742279A (en) * 1954-12-03 1956-04-17 Perfect Circle Corp Machine for heat-treating strip material
US3051633A (en) * 1959-03-16 1962-08-28 Sealed Power Corp Process of chromium plating vented piston rings
US3586544A (en) * 1966-07-20 1971-06-22 Mecanique De Pringy Soc D Method of producing piston rings
US3539192A (en) * 1968-01-09 1970-11-10 Ramsey Corp Plasma-coated piston rings
US3606359A (en) * 1969-08-08 1971-09-20 Ramsey Corp Tungsten carbide coated piston rings

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795403A (en) * 1970-10-29 1974-03-05 E Sugahara One-piece channel shaped piston ring
US4145060A (en) * 1975-12-20 1979-03-20 Goetze Ag Axially and radially clamping spreader ring for an oil scraping piston ring
US4548416A (en) * 1983-07-21 1985-10-22 Toyota Jidosha Kabushiki Kaisha Oil-ring including two rail rings and an expander-spacer ring which bites into the rail ring
US5398945A (en) * 1992-11-12 1995-03-21 Dana Corporation Piston ring of "Y" cross-section
US20020070507A1 (en) * 2002-01-18 2002-06-13 Stephane Heraud Piston oil ring having land flanked by concave sidewalls
US6655697B2 (en) * 2002-01-18 2003-12-02 Dana Corporation Piston oil ring having land flanked by concave sidewalls
US20170036256A1 (en) * 2010-10-22 2017-02-09 Cyril Bath Company Structural component and method of manufacture
US20150292621A1 (en) * 2012-10-31 2015-10-15 Mahle Metal Leve S/A Single-piece oil control ring
US9574663B2 (en) * 2012-10-31 2017-02-21 Mahle Metal Leve S/A Single-piece oil control ring

Similar Documents

Publication Publication Date Title
US3683477A (en) Method of producing one-piece channel shaped piston ring
US2311729A (en) Method of making sheet metal piston rings
US4829647A (en) Method of making low friction finger follower rocker arms
DE112010003953B4 (en) Oil ring for internal combustion engine
US4872429A (en) Method of making low friction finger follower rocker arms
GB1586946A (en) Multiple-part oil-scraper ring
GB2112025A (en) Surface treatment of metal rings
US2262311A (en) Piston ring
US2367159A (en) Electrolytic process of making piston rings
US2273691A (en) Offset piston ring construction
US3768818A (en) Spring ring for a piston ring assembly
US4214762A (en) Rolled metal piston ring
US2111258A (en) Piston ring expander
US3795403A (en) One-piece channel shaped piston ring
US1811012A (en) Piston packing
US3729790A (en) A one-piece channel shaped piston ring
US2252199A (en) Piston ring
US5809643A (en) Method for making piston rings
US2417610A (en) Method of manufacturing piston rings
US2103119A (en) Noncorrodible object and method of producing same
US2073500A (en) Piston ring
US2645536A (en) Flexible piston ring
GB931318A (en) Needle bearing cage and its method of production
US3191948A (en) Piston ring
US3181875A (en) Piston rings