| 摘要 |
PURPOSE: A piston cooling apparatus is provided to compact the structure of a piston cooling apparatus by forming a separate cooling gallery and a discharge unit and to improve productivity by excluding a separate injector for each bore. CONSTITUTION: Many bores(2) are formed on a cylinder block(1). A main gallery(4) for oil supply is formed in the cylinder block. A cooling gallery(5) for oil delivery is formed at a lower portion of the main gallery. A control valve(6) formed between the main gallery and the cooling gallery is selectively opened and closed depending on the oil pressure to supply oil to the cooling gallery. Plural discharge holes(7) are formed in the cooling gallery. The discharge holes are communicated with the interior of each bore. Oil is injected to the piston through the discharge holes.
|
