| 摘要 |
1283956 Making pistons CATERPILLAR TRACTOR CO 5 Aug 1969 [3 Sept 1968] 39059/69 Heading B3A [Also in Division F2] A piston 10 has a U-section wear ring insert 18, the limbs of which form the wall remote from the piston head and part of the bottom wall of each of two adjacent ring grooves 12 and 14 and the web has spaced holes 20 therein filled by the piston metal. In making, a group of inserts is formed by centrifugally casting, one insert is then separated from the group by machining, as at 24, Fig. 3, cast with the piston and finally grooves 12 and 14 are machined. The piston 10 may be of aluminium. |
