Bronze plasting of thickness 0.6 to 0.7 mm on steel to produce bi-metallic shoe of hydraulic pump aeronautical application.

摘要

The hydraulic pump is divided in to three main sections. • Cradle Housing assembly. • Actuator Housing assembly. • Valve Plate assembly. The rotating group of the pump consists of drive shaft assy, plungershoe assembly with shoe hold down plate, retainer, retainer bush & cylinder block housed in the central portion of the unit. In the Cradle housing, the Cradle holds plunger-shoe assembly with the help of a shoe hold-down plate and retainer. The plunger shoe joints are hydraulically balanced during the delivery stroke against the cradle. The axial load acting on the piston is balanced through the holes provided in plungers & shoes which act under the area of the face of the shoe. The pressure gradient acting across the land of the shoe is balanced effectively against the pressure force on the plungers. This also maintains a thin oil film between shoe & cradle face resulting in no metal to metal contact except during starting and stopping. The control leakage across this results in high volumetric efficiency and low frictional losses. The bimetallic shoe is made for strength, durability as well as lubricating/anti seizure properties.