STRUCTURE AND FUNCTION HYDRAULIC PUMP OPERATION 1. Operation of pump Cylinder block (9) rotates together with shaft (1), and shoe (7) slides on flat surface A . When this happens, rocker cam (4) moves along cy- lindrical surface B , so angle α between center line X of rocker cam (4) and the axial direction of cylinder block (9) changes. (Angle α is called the swash plate angle). i) Center line X of rocker cam (4) maintains swash plate angle α in relation to the axial di- rection of cylinder block (9), and flat surface A moves as a cam in relation to shoe (7).
In this way, piston (8) slides on the inside of cyl- inder block (9), so a difference between vol- umes E and F is created inside cylinder block (9). The suction and discharge is carried out by this difference F - E . In other words, when cylinder block (9) rotates and the volume of chamber F becomes smaller, the oil is discharged during that stroke. On the other hand, the volume of chamber E becomes larger, and as the volume becomes bigger, the oil is sucked in (Fig. 1). PA PB 4 7 8 9 E X α PA PB RKS00270 1 A F B Fig. 1 ii) If center line X umes and suction or discharge of oil (Fig. 2). iii) Center line X swash plate angle α moves as a cam in relation to shoe (7). umes and (9).
difference - chamber port PA, PB reverse (Fig. 3). 10-18 SK818-5 SK820-5 turbo (4) is in line with block (9) (swash ce between vol- der block (9) be- not carry out any g. 2). m (4) maintains on to the axial di- nd flat surface A shoe (7). the inside of cyl- ce between vol- 9 E' 4 PA PB 0 RKS00220 F' ide cylinder block Fig. 2 arried out by this ds, when cylinder e of chamber E” PA PB 7 8 9 E" scharged during 4 d, the volume of , and as the vol- is sucked in. PA angle is changed, ge and suction of α PB X RKS00100 F" Fig. 3 Fig. 2