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Powertrain Parts Piston rings Piston rings that control lubrication oil are an important functional component requiring high precision and durability since they are used in parts moving at great speed. Piston rings

Piston rings for gasoline engines

As fuel efficiency improves, reduced weight and a decrease in mechanical loss for engines have become important issues to be solved. In order to reduce friction loss around pistons that accounts roughly for 40-50% of friction loss in the entire engine, narrower-width piston rings that are compatible with smaller pistons and the use of low-tension piston rings are becoming widespread.

Top ring with narrower width

Top ring with narrower width

【Features】
Shrinking ring width reduces piston weight and results in the improvement of fuel efficiency.
【Applications】
Gasoline engines for motor bikes, and small gasoline engines for automobiles

Oil rings with narrower width

Oil rings with narrower width

【Features】
Lowering tension of rings to reduce friction contributes to improving fuel efficiency. By making the ring narrower, the same level of tracking features is secure, even with lower tension.
【Applications】
Gasoline engines for motor bikes, various gasoline engines for automobiles and others

Piston rings for diesel engines

As exhaust restrictions, high output, power, longer durability, and fuel efficiency are being demanded of diesel engines recently, anti-abrasion, reduced oil consumption, and high rigidity are required of piston rings.

Steel PVD top rings

>Steel PVD top rings

【Features】
For current diesel rings, taking higher power output, durability, and anti-abrasion into consideration, materials are shifting from cast iron to steel, and surface treatment is shifting from nitride to PVD.
【Applications】
Diesel engines for automobiles and others

Eccentric barrel top rings

Eccentric barrel top rings

【Features】
For current diesel rings, the shape has been changing to be compatible for higher functions. Eccentric barrel rings aim to improve oil control functions by moving the peak position of the outer barrel of the ring that oscillates with the bore downward.
【Applications】
Diesel engines for automobiles and others

Piston ring compatible with aluminum cylinder bore

This is a superior piston ring for oscillation with aluminum alloys.

DLC piston ring

DLC piston ring

【Features】
TPR was the first in the world to mass produce DLC-coated piston rings. They are characterized by outstanding matching of low friction and direct oscillation with aluminum.
【Applications】
Gasoline engines for motor bikes

Race car piston rings

This is a special ring used in various categories of motor sports.

【Features】
Unfortunately, details of rings for motor sports cannot be displayed, however, we provide special rings that are optimum for engine characteristics.
【Applications】
Engines for domestic and overseas motor sports

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