OIL PUMP FOR AUTOMATIC TRANSMISSION

摘要

PURPOSE: An oil pump for an automatic transmission is provided to reduce time and costs required to the oil pump manufacture by controlling abrasion between a perturbation part and a driven gear. CONSTITUTION: An oil pump for an automatic transmission comprises a housing(10) and a liner(30). The housing comprises a perturbation part(12) and an inlet(14). A drive gear and a driven gear are arranged on the perturbation part. The working fluid flows to the perturbation part through an inlet. The liner is arranged in between an inner wall of the housing accomplishing the perturbation part and the driven gear. A fixed protrusion(36) is formed on the liner.