4
Section II
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Description
A. General
All motors covered in this manual are basically identical in
construction. Variables in the model numbers cover different
sizes, mounting and port connections. Motors are of three
basic sizes: small series M2-200, intermediate series M2-300
and large series M2-400 and M2-500. Sizes are progres-
sively rated in torque.
Motors are designed for installation in a hydraulic circuit
requiring rotary mechanical power. Their operating character-
istics are of the variable horsepower class in that horsepower
output is in proportion to rpm so long as operating pressure
is constant. These motors can be used for reversing service
and can be stalled under load without damage.
Construction is such that the output capacity can be varied
(within a series) to suit the particular needs of the user. This
is accomplished by changing the ring and rotor sub-
assembly (Section VI).
B. Assembly and Construction
Basic motor construction is illustrated in Figure 1. The unit
consists principally of a body, cover, drive cartridge, pressure
plate, drive shaft and bearings. The cartridge consists of a
ring, rotor, twelve vanes and twelve rocker arms. The vanes
slide radially in the rotor slots to follow the cam contour of the
ring. Rocker arms hold the vanes out against the ring.
The rotor is splined to the output shaft. The shaft is sup-
ported by two bearings.
The cartridge is adjoined by the pressure plate on one side
and the body on the other. The pressure plate is housed in
the cover and loaded against the cartridge by a spring
washer (not visible in Figure 1). The cover and body each
incorporate an oil port used as system connections to direct
oil to and from the motor.
Locating pins position the ring with respect to the pressure
plate and body. The shaft seal prevents leakage of oil out of
the system at the shaft and the entry of air into the system.
C. S2 Motors
These motors differ from standard units in that the vanes are
held out against the ring by oil pressure. Pressure is fed in
through a connection in the cover and through a special
pressure plate. Rocker arms are not used.
D. Mounting and Drive Connections
Units can be either face or foot mounted. The rugged two
bearing construction permits the motors to be used in direct
or indirect drive installations.
E. Applications
For motor ratings and applications, consult a Vickers applica-
tion engineer.
Pressure Plate
Vane
Rotor
Rocker Arm
Bearing
Snap Ring
Key
Shaft
Body
Ring
Cover
Seal
Bearing
Figure 1. Cutaway View of Vane Motor