Development aims

Reduce the amount of leaked oil (assuming that the amount of oil required by the bearing is secured)
→Enable the capacity of the oil pump to be reduced to help improve fuel economy

Development concept

Reduce the amount of oil leaked from the main bearing by improving the form of the groove in the main bearing (from trapezoidal to R shaped)

Base (Semi-circular groove)

Current products(Eccentric groove)

Groove depth is reduced gradually
→Reduce side flow

Developed product

Gradual reduction in groove depth is accompanied by a gradual reduction in groove width
→Side flow is further reduced


Oil leakage amount

Improved fuel efficiency 0.04%(Estimated value compared to current products with eccentric groove)