| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily constitute oil passages of optional shape without causing complicating manufacturing work and increasing manufacturing cost. SOLUTION: This oil pump body 10 with oil passages 12, 13, 14, 15, 16, 17, 18 to an oil pressure generating mechanism 119 within the wall thickness is constituted by burning binders of shell cores 20A, 20B, 20C arranged when casting.</p> |
