OIL PUMP FOR AUTOMATIC TRANSMISSION

摘要

PURPOSE: An oil pump for an automatic transmission is provided to improve the durability of a unit by discharging a foreign substance injected into space between a dive gear and a housing unit for decreasing a abrasion from the foreign substance. CONSTITUTION: A oil pump for an automatic transmission comprises a housing unit(10), a driven gear(20), and an exhaust groove unit(40). The housing includes a suck groove(12) and a discharge groove(14). The driven gear is located inside the housing. The drive gear is partially arranged inside the driven gear. The exhaust groove forms a groove connecting to an outer and an inner drive gear. The drive gear includes a gear body including a hollow and a first gear(36) protruding along the gear body. Multiple exhaust grooves are installed around the drive gear. An exit of the exhaust groove is formed on the side of the first gear.