Filled piston with central oil tube

摘要

PCT No. PCT/US82/00433 Sec. 371 Date Apr. 5, 1982 Sec. 102(e) Date Apr. 5, 1982 PCT Filed Apr. 5, 1982 PCT Pub. No. WO83/03650 PCT Pub. Date Oct. 27, 1983.A filled piston (10) has a tube (19) extending axially through the core (13) of filler material. The tube (19) provides the passage (23) through which hydraulic fluid passes to lubricate the bearing surfaces of components associated with the piston (10). This eliminates the problem of the hydraulic fluid eroding the filler material and thus the need for visual inspection of the passage through the piston.