LUBRICATION SYSTEM


  1. CONSTRUCTION


    1. The oil pump is installed on the timing chain cover assembly and uses compact and high efficiency cycloid gear teeth for the direct drive method of the crankshaft.

    2. A variable discharge oil pump is used. While maintaining the oil pressure in the low and high speed range necessary for the bearing lubrication and the Variable Valve Timing-intelligent Wide (VVT-iW), Variable Valve Timing-intelligent (VVT-i), and piston jet control system operation and by reducing the surplus oil pressure in the middle speed range, friction has been decreased.

    3. An inner relief method is used for the relief valve, and by returning engine oil in the oil pump, pump drive loss is reduced while suppressing the fluctuation in the oil level.

    4. The oil pump discharge amount and relief pressure have been optimized to achieve enhanced fuel economy.

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      *1 Timing Chain Cover Assembly *2 Oil Pump

  2. OPERATION


    1. The variable discharge oil pump fully discharges the oil pumped up by the oil pump at the low engine speeds and adjusts the discharge pressure at the mid and high engine speeds to control the engine oil pressure through the operation of the relief valve.


      1. Low Speed Range Operation


        • The full amount of oil pumped up by the oil pump lubricates the engine to ensure the necessary oil pressure in the low speed range.

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      2. Middle Speed Range Operation


        • The oil pump pressure operates the relief valve, and by opening the No. 1 relief, surplus oil pressure is decreased in the middle speed range.

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      3. High Speed Range Operation


        • The oil pump pressure further operates the relief valve, and by closing the No. 1 relief and opening the No. 2 relief, the necessary oil pressure is adjusted in the high speed range.

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      4. From High to Middle Speed Range Operation


        • When the oil pump rotation speed decreases from the high to middle speed range, the reactive force between the spring force and oil pump oil pressure gradually lowers the oil pump pressure to suppress the torque fluctuation via the change in oil pressure.

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