STRUCTURE AND FUNCTION HYDRAULIC PUMP FUNCTION The rotation and torque transmitted to the pump shaft is converted into hydraulic energy, and pressurized oil is dis- charged according to the load. It is possible to change the discharge amount by changing the swash plate angle (plus, zero and minus) 4 2 5 6 14 3 15 (Standard version) 1 11 7 A 12 10 13 8 9 15 (High-flow versione) RKS00351 1. Shaft 2. Case 3. Cradle bearing 4. Rocker cam 5. Control piston 6. Slider 7. Shoe 8. Piston 9. Cylinder block 10. Valve plate 11. Main bearing 12. Spline 13. Sub bearing 14. Charge pump 15.
Work equipment pump STRUCTURE Cylinder block (9) is supported to shaft (1) by a spline (12), and shaft (1) is supported by the front and rear bearings (11), (13). The tip of piston (8) is a concave ball, and shoe (7) is caulked to it to form one unit. Piston (8) and shoe (7) form a spherical bearing. Rocker cam (4) has flat surface A , and shoe (7) is al- ways pressed against this surface while sliding in a circular movement. There is a cradle bearing (3) between cradle and rock- er cam (4) which is secured to the case. Rocker cam (4) sways on cradle bearing. Piston (8) carries out relative movement in the axial direction inside each cylinder chamber of cylinder block (9).
The cylinder block seals the pressurized oil to valve plate (10) and carries out relative rotation. This sur- face is designed so that the oil pressure balance is maintained at a suitable level. The oil inside each cyl- inder chamber of cylinder block (9) is sucked in and discharged through valve palte (10). 10-17 SK818-5 SK820-5 turbo