ContChamp DRD-S
Technical Handbook
Hydraulic pumps
Description
36
S.
Grupp
70
9407
04-10
Vane pump
The pumps for ATTACHMENT (H4) and BRAKE SYSTEM (H5)
are of the vane type and driven from take-offs on the variable
pumps (H2 and H3).
These pumps consist of a pump casing and a pump unit, and are
of simple design. A rotor in the pump unit comprises a number of
vanes fitted in radial slots. The rotor is driven by a shaft and ro-
tates in a cam ring. The rotor vanes follow the profile of the cam
ring, and each vane performs two cycles – each comprising one
suction stroke and one delivery stroke – per revolution. The fluid
flows radially through the pump unit.
The vanes are forced outwards towards the cam ring by centrifu-
gal force and by thrust pins which are subjected to the same pres-
sure as the pump delivery pressure. This ensures that the vanes
will always be in contact with the cam profile. An fluid film pre-
vents the vanes from coming into metallic contact with the cam
profile. In the same way, an fluid film prevents metallic contact
with the side plates.
Since the vanes, ports and pressures are balanced diametrically,
the net load on the rotor is pure torque caused by the pumping
action. Sturdy shaft bearings carry the forces caused by the
pump drive.
1. Replaceable cartridge assembly, includes cam
ring, rotor, vanes, pins and sideplates
2. Front and rear sideplates
3. Ball bearing
4. Front sideplate, is lamped axially by discharge
pressure to reduce internal leakage
5. Double shaft seal
6. Drain hole
7. Vane, is urged outward at suction ramp by pin
force and centrifugal force
8. Cam ring
9. Suction ramp where unloaded ramp moves out
10. Working vane on in or arc seals discharge pres-
sure from the suction port
12. Discharge ramp where unloaded vane
moves in
13. Pin cavity is at a steady pressure slightly higher
than at discharge port
14. Lub side holes, lubricate the sideplate surfaces
15. Pressure pins, force the vanes outward
16. Vanes
Vane pump
Содержание ContChamp DRD S Series
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