Hydraulic pump

摘要

A hydraulic pump (90, 1) includes a housing (91, 100) including an inlet port (91i, 51), an outlet port (91 e, 52), and a fluid chamber (91f, 80), a shaft (92p, 20) fixed to the housing, a rotor (93, 30) including an impeller portion (93P, 32), a fixed portion (91s, 42, 53) provided at the housing and made of an aluminum alloy, the fixed portion securing the shaft (92p, 20), a short-circuit portion (92s, 22, 23) provided at the shaft and made of a stainless steel having a nitrided layer at a surface, the short-circuit portion being supplied with a protection current from the fixed portion (91s, 42, 53), and a support portion (92p, 21) formed by extending from the short-circuit portion (92s, 22, 23), an outer peripheral surface of the support portion being covered with an amorphous carbon film of which a main component is carbon and which includes silicon.