Piston Rings TRIZ Cases

A dual thermal-sprayed coating with a shot-peened AlCuFe run-in layer improves piston ring sealing, wear resistance, and friction control.

A combined compression, scraper, and oil suction ring improves piston sealing, blocks blow-by gas, and prevents oil flow-back.

A shaped expander spring and zero-play support ring reduce cylinder-wall friction in a multi-piece oil scraper ring, lowering fuel consumption.

Oblique upper-flank recesses and an opposing chamfer stabilize a compression piston ring at high speed, reducing wobble, blow-by, and fracture risk.

Roughened piston ring end sections retain oil and support selective CrN or DLC coating to reduce crazing, flaking, and wear.

Specific Sn-Zn-Al or Sn-Zn-P bronze powder resists sintering oxidation, preventing dark streaks and edge defects in PTFE compounds.

A segmented scraper ring creates 360-degree cylinder wall contact and venting paths to block oil entry, reducing consumption and emissions.

Laser-remelted ledeburite on piston ring flanks plus a coated running surface improves wear resistance, sealing, and long-load durability.

Movable sealing rings regulate annular-bore air flow and chamber pressure to improve torque and combustion efficiency in a circulating piston engine.

A harder secondary ring supports the sealing ring against gas-pressure deformation, maintaining reliable compressor sealing under high pressure.

A grooved twin sealing ring uses pressure locking and gas-force balancing to limit dry-running wear, fracture risk, and leakage.

A spacer expander with a lug W/H ratio of 1.5 or more cuts lug wear, stabilizes side rails, and preserves oil scraping in high-output engines.

Segmented cryogenic piston rings with an expander ring maintain bore contact during wear and thermal contraction to reduce direct leak paths.

Convex ring and oil-ring segment profiles cut friction loss while preserving oil sealing and blocking oil flow into the combustion chamber.

An overlapped abutment joint and resin-embedded metal tension ring cut gas leakage, resist corrosion, and prevent ring peeling.

Angularly spaced oil pockets between the piston head and ring capture droplets that can trigger LSPI, helping protect engine components.

Sized openings in the piston ring groove let combustion reach crevice volumes, burn trapped mixture, and reduce unburned hydrocarbon emissions.

Chamfered piston ring land blends reduce effective gap area variation, lowering second land pressure, oil burning, and deposits.

Offset recesses in sliding bearing surfaces retain lubricant and prevent overlap, cutting friction and wear even at low relative speeds.

Alternating hard carbon layers with an adhesion-tuned base region help sliding members resist wear, chipping, and peeling under high loads.

A cobalt-alloyed Ni-P plating film raises sliding member hardness and wear resistance without boron treatment defects or contamination.

Inert gas grooves in movable jig members shield the weld zone, limit deformation, and fit different cylinder diameters during joining.

A multi-member piston forms the packing groove during assembly, avoiding radial seal expansion and enabling easier automation.

Multiple intake stages and PTFE-coated rings cut oil breakdown, emissions, and maintenance while preserving piston sealing and cooling.

An asymmetrical oil ring groove shifts the oil outflow connection to the lower flank, enabling burr-free machining and stable oil scraper ring retention.

Alternating PVD hard carbon layers with different sp2/sp3 ratios balance wear, chipping, low friction, and peeling resistance in thick films.

Asymmetric flank angles let an MF expander spring expand axially under heat, avoiding piston ring groove jamming while reducing wear.

A graded sp2 DLC coating helps piston rings resist abrasive wear and peeling while reducing attack on the cylinder bore under degraded oil.

A graded and cyclical CrMoN coating cuts piston ring friction while maintaining hardness and adhesion at thicknesses up to 80 µm.

Selective PVD protective deposits in DLC surface recesses help piston rings resist heat stress while reducing wear and improving running-in.

Controlled C, Si, Mn, and Cr levels help a steel piston ring conduct heat while resisting heat fatigue in high-temperature engines.

A multilayer DLC piston ring coating uses cyclic Cr, Si, and Ti doping to cut internal stress, resist peeling, and allow thicker wear-resistant films.

Position-limiting protrusions and friction-reducing rings keep the piston sleeve rotating correctly, cutting friction and improving pump reliability.

Elastic conical flank legs remove axial play in the oil scraper ring, improving oil control while simplifying manufacture and installation.

A half-funnel recess in the ring spring support section speeds oil flow to the passage opening, cutting residue buildup, wear, and oil carbon formation.

Recesses only in the stroke center and inclined piston ring surfaces cut friction while limiting oil consumption in engine sliding pairs.

A layered iron-phosphorous and nickel-phosphorous coating improves aluminum brake piston adhesion and sliding under braking heat.

A soft segmented sealing ring held between stronger base and top rings reduces cold flow, wear, and leakage in compressors above 500 bar.

A piston or liner groove recaptures oil in the top-land crevice to keep it out of the combustion chamber and prevent knock in lean-burn gas engines.

A low-speed foundation film and controlled hard carbon composition improve piston ring wear resistance while reducing surface unevenness.

A notched stepped piston ring uses gas pressure balancing to cut contact wear while preserving oil scraping and ring durability.

Active Ti on a thermally sprayed sliding surface promotes Mo additive decomposition to form MoS2, cutting friction while preserving wear resistance.

Controlling hydrogen content and HM/HIT lets 3 μm+ hard carbon piston ring coatings resist cracking, peeling, and wear.

Grit blasting, thick PVD coating, and lapping help piston rings resist LSPI chipping while preserving lubrication and reducing wear.

A hard base layer with a porous top layer helps piston rings conform quickly, cutting blow-by, oil consumption, and break-in wear.

A hard base layer and porous top layer help piston rings conform quickly, cutting blow-by, oil consumption, friction, and wear.

Alternating trivalent chromium and nickel-phosphorous layers use engine heat to form a hard wear-resistant coating without hexavalent chromium.

Graphite nanoparticle amorphous carbon coating cuts friction, wear, and internal stress in piston rings under thin oil film conditions.

Half-funnel recesses that deepen toward through-openings speed oil flow to the piston center, clearing residues and reducing ring wear.

Keyed piston rings, a heat-radiating gas tube, and delayed bolt unlocking reduce gas leakage, overheating, and cycling instability.