VALVE, VALVE SPRING, VALVE SEAL, VALVE GUIDE [SKYACTIV-D 2.2]

id0110s5001300

Purpose, Function

Valve

• The intake valve is pressed down by the cam, the intake air passage is opened, and air is introduced into the cylinder.

• The exhaust valve is pressed down by the cam, the exhaust air passage is opened, and combustion gas is exhausted from the cylinder.

Valve spring

• The valve spring adheres the valve to the valve seat by pulling up the valve by spring force, and air tightness in the combustion chamber is maintained.

Valve seal

• The valve seal prevents engine oil from entering combustion chamber through the valve guide, and engine oil consumption is suppressed.

Valve guide

• The valve guide maintains the valve stem to open and close the valve smoothly.

• The valve guide cools the valve by transmitting valve heat to the cylinder head.

Construction

• The valve, valve spring, valve seal, and valve guide are assembled to the cylinder head.

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• The sliding resistance has been reduced by setting the valve spring load to the required minimum.

• The intake valve and exhaust valve are subjected to a nitriding treatment to enhance wear resistance.

• Unequal pitch valve spring has been adopted.

• The valve guide is made of sintered alloy with excellent wear resistance.