Catalogue HY29-0037-M1/UK
Overall Hydraulic Motors, Fixed
M5AS - M5ASF Denison Vane Motors
4
Parker Hannifin SAS
VPDE, Denison Vane Motors
Vierzon - France
Operation of these rugged hydraulic motors is simple.
The motor shaft is driven by the rotor. Vanes, closely fitted into the
rotor slots, move radially to seal against the cam ring. The ring has
two major and two minor radial sections joined by transitional sections
called ramps. These contours and the pressures exposed to them are
balanced diametrically.
Light springs urge the vanes radially against the cam contour, assuring
a seal at zero speed, so that the motor can develop starting torque. The
springs are assisted by the centrifugal force at higher speeds. Radial
grooves and holes through the vanes equalize hydraulic forces on the
vanes at all times.
Fluid enters and leaves the motor cartridge through openings in the
side plates at the ramps. Each motor port connects the two diametri-
cally opposed ramps.
The rotor is axially separated from the sideplate surfaces by the film of
oil. The front sideplate is clamped against the cam ring by the pressure,
maintening optimum clearance as dimensions change with tempera-
ture and pressure. A three way shuttle valve in the sideplate causes
clamping pressure in port A or B, whichever is the highest.
Materials are chosen for long life efficiency. Vanes, rotor and cam ring
are made out of hardened high alloy steels. Cast semi-steel sideplates
are chemically etched to have a fine crystalline surface for good lubri-
cation at start-up.
The distance between the suction pipe & the return lines in the tank
should be at its maximum.
A bevel on both suction & return lines is recommended to increase the
surface and so lower the velocity. We suggest a 45° minimum angle.
M5 velocities : inlet x < 6 m/s (x < 20 ft per sec.)
: return under pressure x < 6 m/s (x < 20 ft per sec.)
: return low pressure x < 3 m/s (x < 10 ft per sec.)
: Always insure that all return and suction lines are un-
der the oil level to avoid forming aeration or vortex ef-
fect. This should be done under the most critical situa-
tion (all cylinders extended for example).
Straight and short pipes are the best.
Q (l/min) Q (GPM)
6 x
p
x r
2
(cm
2
) 3.12 x
p
x r
2
(in
2
)
The size of the air filter should be 3 times greater than the max. instant
return flow (ex: When all the cylinders are in movement ).
A coaxial drive is recommended. For any other type of drives, please
contact Parker.
Make sure that all protective plugs & covers have been removed.
oPerATion
STArT uP & cHeck uP
V =
= m/s
V =
= ft/s
check that the assembly of the power unit is correct :
Start up instructions & recommendations
The cartridge is a replaceable assembly,
including cam ring, rotor, vanes and springs.
The floating side plate contains a shuttle
valve wich passes the highest pressure
signal to the clamping area.
Cam ring is interchangeable with others
of different displacements.
Major arc where fluid
works to push the
vane.
Side grooves and radial holes cause undervane
and overvane pressure to be equal.
