Chapter 3 Hydraulic Pumps 3.2 Piston Pumps The oil suction and delivery actions of a piston pump depend upon the size change of the chamber produced by the reciprocating movement of the pistons within their cylinder bores.The signal piston pump shown in Fig3-1 is a radical type. 3.2.1 Valve shaft radial piston pumps The pump's delivery 1.Operating principle expressed by: v-2 (3-1) 2 where d is the piston diameter,e is the offset between the stator and cylinder case (rotor),zis the number of the pistons. Fig.3-5 Valve shaft radial piston pump 1-Piston2-Rotor 3-Bush4-Stator5-Valve shaft Homepage List Upwards Dowrward达 Retumn ExitChapter 3 Hydraulic Pumps 14 3.2 Piston Pumps 3.2.1 Valve shaft radial piston pumps The oil suction and delivery actions of a piston pump depend upon the size change of the chamber produced by the reciprocating movement of the pistons within their cylinder bores. The signal piston pump shown in Fig.3-1 is a radical type. 1.Operating principle The pump ’ s delivery is expressed by: where d is the piston diameter, e is the offset between the stator and cylinder case (rotor), z is the number of the pistons. Fig. 3-5 Valve shaft radial piston pump 1- Piston 2-Rotor 3-Bush 4- Stator 5-Valve shaft 2 π (3-1) 2 d V ez =