GB2302930A - Cast iron piston ring - Google Patents

Cast iron piston ring Download PDF

Info

Publication number
GB2302930A
GB2302930A GB9613665A GB9613665A GB2302930A GB 2302930 A GB2302930 A GB 2302930A GB 9613665 A GB9613665 A GB 9613665A GB 9613665 A GB9613665 A GB 9613665A GB 2302930 A GB2302930 A GB 2302930A
Authority
GB
United Kingdom
Prior art keywords
piston ring
cast iron
depressions
running surface
iron piston
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.)
Granted
Application number
GB9613665A
Other versions
GB2302930B (en
GB9613665D0 (en
Inventor
Michel Hans-Albert
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.)
AE Goetze GmbH
Original Assignee
AE Goetze GmbH
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 AE Goetze GmbH filed Critical AE Goetze GmbH
Publication of GB9613665D0 publication Critical patent/GB9613665D0/en
Publication of GB2302930A publication Critical patent/GB2302930A/en
Application granted granted Critical
Publication of GB2302930B publication Critical patent/GB2302930B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F16J9/22—Rings for preventing wear of grooves or like seatings

Description

Cast iron piston ring 2302930 This invention relates to a cast iron piston
ring with depressions formed in the running surface.
Piston rings which serve to seal the combustion chambers of internal combustion engines have to have high strength or resistance to abrasion, so that they do not wear out prematurely. In addition, such piston rings are subjected to high thermal stresses. It is already known to form depressions in the running surfaces in the case of cast iron piston rings. Lubricant is held in these depressions.
DE OS 1 904 734 discloses a piston ring in which the depressions are formed by etching out graphite lamellae. It is also known to apply chromium layers with a finely distributed network of cracks as a sliding surface on the running surface.
The chromium layer has a high hardness and can thus prolong the life of the piston ring. The disadvantage of such constructions lies firstly in that the depressions are not suitable as long-term lubricant reservoirs and secondly the application of wear resistant materials has a bad effect in the production process, since their use leads to effects which are in part damaging to the environment.
The invention is based on the object of improving a piston ring of the kind referred to in relation to the manufacture thereof, while seeking for optimum operating conditions at the same time.
This object is met according to the invention in that the depressions are made by cold-forming the cast iron material, so that individual, non-uniform plateau areas are formed on the running surface. Compaction of the material takes place through the cold-forming, with the result that the hardness increases in this region. Because of this it is no longer necessary to apply wear-resistant coatings to the running surface. Moreover, an irregular labyrinth results between the plateaus and contributes to the improvement of the lubrication conditions. The oil clinging in the depressions runs round the plateaus and thus contributes to cooling. The depressions are preferably formed by impressing ball-shaped particles. Depending on the application, a specific roughness may be required. In Otto engines the roughness should be smaller than in Diesel engines. In particular the roughness should lie in a range between 3 and 15 jum.
0 The invention is explained below in more detail with reference to an embodiment shown in the drawings, in which:
Figure 1 is a view of a piston ring according to the invention, Figure 2 is an enlarged portion according to the view II in Figure 1, Figure 3 is a cross-section of Figure 2.
A split piston ring for internal combustion engines is shown in Figure 1 in perspective view. The piston ring consists of cast iron. The plateau surfaces 3 (Figures 2, 3) formed on the running surface by cold-working make it possible to dispense with additional wear-resistant layers on the running surface, which are costly to make. The plateaus 3 result from compaction of the cast iron material on the running surface 2, in that ball-shaped particles are pressed into the running surface 2, so that they create depressions 4. When the particles are pressed in, an irregular labyrinth results, with non-uniform plateau surfaces 3, which can build up an oil film, which protects the running surface 2 from undesirable high wear by cooling and lubrication.
a

Claims (3)

1. A cast iron piston ring with depressions formed in the running surface, characterized in that the depressions (4) are made by cold-forming the cast iron material, so that individual, non-uniform plateau areas (3) are formed on the running surface (2).
2. A piston ring according to claim 1, characterized in that the depressions (4) are formed by impressing ball-shaped particles.
3. A piston ring according to claim 1 or 2, characterized in that the roughness of the running surface (2) lies between 3 and 15 pm.
GB9613665A 1995-07-01 1996-06-28 Cast iron piston ring Expired - Fee Related GB2302930B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19524066A DE19524066C2 (en) 1995-07-01 1995-07-01 Cast iron piston ring

Publications (3)

Publication Number Publication Date
GB9613665D0 GB9613665D0 (en) 1996-08-28
GB2302930A true GB2302930A (en) 1997-02-05
GB2302930B GB2302930B (en) 1998-10-28

Family

ID=7765798

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9613665A Expired - Fee Related GB2302930B (en) 1995-07-01 1996-06-28 Cast iron piston ring

Country Status (4)

Country Link
DE (1) DE19524066C2 (en)
FR (1) FR2736095B1 (en)
GB (1) GB2302930B (en)
IT (1) IT1282564B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104685267A (en) * 2012-10-02 2015-06-03 株式会社理研 Piston ring

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10134736C2 (en) * 2001-07-17 2003-10-09 Man B&W Diesel A/S, Copenhagen Sv Large machine with at least one sliding surface and method for producing a sliding surface

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2069098A (en) * 1980-02-11 1981-08-19 Wedge R Surface treatment of piston rings

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1904734A1 (en) * 1969-01-31 1970-08-13 Goetzewerke Cast iron piston ring
US4258084A (en) * 1978-10-17 1981-03-24 Potters Industries, Inc. Method of reducing fuel consumption by peening
DE3813617C1 (en) * 1988-04-22 1989-10-05 Goetze Ag, 5093 Burscheid, De
DE4002290A1 (en) * 1990-01-26 1991-08-01 Ek Geraetebau Gmbh Reverse flow domestic tap filter flushing water - applied by inbuilt jet at increased pressing to limited filter surface

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2069098A (en) * 1980-02-11 1981-08-19 Wedge R Surface treatment of piston rings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104685267A (en) * 2012-10-02 2015-06-03 株式会社理研 Piston ring

Also Published As

Publication number Publication date
ITMI960900A1 (en) 1997-11-07
FR2736095A1 (en) 1997-01-03
GB2302930B (en) 1998-10-28
GB9613665D0 (en) 1996-08-28
IT1282564B1 (en) 1998-03-27
ITMI960900A0 (en) 1996-05-07
DE19524066C2 (en) 1997-12-18
DE19524066A1 (en) 1997-01-09
FR2736095B1 (en) 2000-01-28

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20010628