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
  • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
• • 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
  • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
  • F16J9/064—Rings with a flat annular side rail
  • F16J9/066—Spring expander from sheet metal
  • F16J9/069—Spring expander from sheet metal with a "C"-shaped cross section along the entire circumference
• • 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
  • F16J9/14—Joint-closures
  • F16J9/16—Joint-closures obtained by stacking of rings

Definitions

• the invention relates to a multi-part oil scraper ring for internal combustion engines, with a U-shaped spring washer provided with axial incisions to form radially outward resilient legs and with at least two annular slats provided with parallel flanks, which over one of their flanks as a stacking level to a height stacked and arranged between the resilient legs of the spreading spring ring in order to define an overall height of the oil scraper ring.
• a two-part oil scraper ring with a U-shaped expansion spring ring is known from DE 197 04 754 C1.
• a single lamella which is arranged between the legs of the spreading spring ring, permits an overall height of the oil control ring of approximately 1.5 mm.
• this solution has the advantage that a sufficient tangential force is exerted on the lamella by the spreading spring, so that the oil scraper effect can also be regarded as sufficient.
• a reduction in the overall height to or below 1.5 mm thus leads to an insufficient wiping action, as also described in DE 197 94 754 C2, so that overall heights of this magnitude for three-part rings can no longer be realized.
• the object of the present invention is to provide an at least three-part oil scraper ring with a minimal axial height, which allows a significantly improved oil scraper effect compared to known oil scraper rings.
• the object is achieved by the features of claim 1.
• the proposed construction of the three-part oil scraper ring which consists of a U-shaped expansion spring ring with lamellae arranged between its legs, on the one hand advantageously achieves a height which corresponds to that of a two-part oil scraper ring, for example that according to DE 197 04 754 C1.
• a tangential force is exerted on the lamellae by the spreading spring ring used, which is further increased by the fact that a certain design of the bearing surface for the spreading spring legs is provided, so that an additional tangential force component is generated on the ring lamellae, which leads to an improved oil wiping effect.
• the design of the contact surface allows the slats to be installed in a significantly simplified manner.
• FIG. 1 is a perspective view of the oil control ring according to the invention.
• Figure 2 is a perspective sectional view of the oil control ring in a first embodiment.
• Fig. 3 is a perspective sectional view of the oil control ring in a second embodiment.
• Fig. 4 is a perspective sectional view of the oil control ring in a third embodiment.
• an oil scraper ring 10 is formed from an expansion spring ring 1 with a U-shaped cross section, between whose radially outwardly directed resilient legs 3 and 4 stacked annular lamellae 7 and 8 with a running surface 9 are arranged.
• the spreading spring ring 1 has slots 2 on its radially inner side, so that the legs 3 and 4 are interconnected via webs 5 designed as spring ring backs. are bound.
• the expansion spring ring 1 is designed to be resilient in the circumferential direction through the slots 2.
• the slats 7 and 8 which are made of steel or cast iron and which can be designed as nose minute rings, each have flanks 7a, 7b and 8a, 8b which are aligned parallel to one another, the lower flank 7b of the upper slat 7 and the upper flank being the stacking planes SE 8a of the lower lamella 8 is used.
• the flanks in the stacking plane SE have a roughness Rz ⁇ 2 ⁇ m for steel fins and Rz ⁇ 4 ⁇ m for cast fins.
• the lamellae have at their radially inner ends, i.e.
• the contact surface 12 is aligned parallel to the flanks 7a, 7b and 8a, 8b, whereby according to a second exemplary embodiment according to FIG. 3 the contact surface 12 extends at an inclination angle ⁇ between 2 ° and 20 ° towards the stack plane.
• this enables simple assembly of the fins and on the other hand creates an at least partially additional force component acting radially on the fins for improved oil wiping.
• the recesses 12 in the lamellae are mirror-symmetrical to one another with the stacking plane SE as a mirror plane and have a height h a that is greater than the thickness D 1 of one leg of the spreading spring ring 1.
• this is one Height-nominal height of the oil scraper ring 10 realized, which is determined exclusively by the height h L of the stacked lamellae 7 and 8.
• the legs 3 and 4 of the spreading spring ring 1 are supported in a radial width B of the bearing surface 12, which corresponds to approximately one third of the total radial width of the lamellae, so that adequate guidance is ensured.
• radially extending oil grooves 6 are introduced circumferentially at an angular distance of 20 °, that is to say in a total of 18 pieces, through which ⁇
• the lamella 7 oil to be stripped from the cylinder wall is conveyed to the radially inner side of the spring washer in the oil space 13 and is transported through the incisions 2 to the crankshaft-side engine compartment.
• the cutouts 11 of the two plates 7 and 8 are designed such that the side 14 of the plates 7 and 8 facing away from the running surfaces 9 bear against the back of the expansion spring ring 1, as a result of which the radial width B of the contact surface 12 can be enlarged.
• the oil to be wiped off the cylinder wall is transported away by the radially extending oil grooves 6 directly via the incisions 6 to the engine compartment on the crankshaft side.
• the fins 7 and 8 can usually be treated by means of a gas nitriding process (GNS) to form a nitride layer.
• GFS gas nitriding process
• a wear coating of the treads 9 can also be applied by a PVD method, for example a CrN coating.
• the oil control ring 10 is inserted in the installed state with sufficient play in the oil ring groove of a piston.
• the expansion spring ring 1 is stretched to a smaller diameter, in which it is compressed in the circumferential direction, so that the resulting radial spring force press the fins 7 and 8 against the cylinder wall, the special design of the recess 11 for receiving the legs 3, 4 of the spring washer 1, a particularly low axial height for a three-part oil scraper ring is realized.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pistons, Piston Rings, And Cylinders (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
• Rolling Contact Bearings (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37116019

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (21)

• 2005
  • 2005-08-06 DE DE102005037203A patent/DE102005037203A1/de not_active Withdrawn
• 2006
  • 2006-07-18 EP EP06761815A patent/EP1910716A1/de not_active Withdrawn
  • 2006-07-18 BR BRPI0614098-0A patent/BRPI0614098A2/pt not_active IP Right Cessation
  • 2006-07-18 WO PCT/DE2006/001238 patent/WO2007016893A1/de active Application Filing
  • 2006-07-18 US US11/990,048 patent/US20100164182A1/en not_active Abandoned
  • 2006-07-18 JP JP2008525377A patent/JP2009504959A/ja not_active Withdrawn
  • 2006-07-18 CN CNA2006800290277A patent/CN101238314A/zh active Pending

Non-Patent Citations (1)

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