ENGINE UNIT


  1. CONSTRUCTION


    1. The shape of the crankshaft has been optimized to achieve a higher dimension of weight reduction, reliability and quietness.

    2. The oil groove on the crankshaft bearing is made eccentric to reduce the amount of oil leakage from the bearing. This enables the capacity of the oil pump to be reduced in order to achieve a low friction operation.

    3. The lining surfaces of some of the crankshaft bearings have been micro-grooved to achieve an optimal amount of oil clearance. As a result, cold-engine cranking performance has been improved and engine vibrations have been reduced.

    4. A solid lubrication overlay is used on the lining surface of the crankshaft thrust washer and the lining surfaces of some of the crankshaft bearings to reduce friction and improve reliability.

    5. Lead-free materials have been used for the crankshaft, crankshaft bearing and crankshaft thrust washer in consideration of environmental issues.

      A01MQSTC01
      *1 Crankshaft *2 Balance Shaft Drive Gear
      *3 Crankshaft Thrust Washer *4 Crankshaft Bearing
      *a Solid Lubrication Overlay *b Micro-grooved
      *c Oil Groove - -

      Figure 1. Location of Crankshaft Bearing

      A01MQV8C01
      *1 Upper Crankshaft Bearing *2 Lower Crankshaft Bearing
      *a No. 1 Crankshaft Journal *b No. 2 Crankshaft Journal
      *c No. 3 Crankshaft Journal *d No. 4 Crankshaft Journal
      *e No. 5 Crankshaft Journal - -
      B003SJM Front - -
      B003SGU Solid Lubrication Overlay A01MR1O Micro-grooved