2-023
Description and Operation of Hydraulic System
2-2-6. Description and operation of cam motor
Construction of cam motor
・The cam motor is made up of output flange (1), housing (2), cam ring (4), end cap (5), brake
housing (6), brake cover (9), cylinder block (10), distributor (11), speed selector valve (12) and
flushing valve (13), etc.
★ The front propulsion line uses cam motors with speed selector valve (12) built in it.
・Eight sets of piston (3) stay assembled into cylinder block (10), while brake housing (6) houses
brake spring (7), brake piston (8) and brake discs (14).
・Housing (2), cam ring (4), end cap (5), brake housing (6) and brake cover (9) form one body
fastened together with securing bolts.
・Cylinder block (10) is spline-fitted to output flange (1) and rotates together when the hydraulic
pressure is fed. Cylinder block (10) has twelve oil ports which align with corresponding ports of
distributor (11).
・Distributor (11) fitted to end cap (5) with a dowel pin feeds oil fed from port A or port B of end cap
(5) to cylinder block (10) and also displaces oil from cylinder block (10). For this purpose, there
are twelve oil ports in distributor (11) to negotiate the six cam shapes of cam ring (4).
Front propulsion motor
・Speed selector valve (12) is fitted between ports A and B of end cap (5) and distributor (11). One
port of speed selector valve (12) leads to three ports of distributor (11).
Rear propulsion motor
・Port A of end cap (5) connects to six ports of distributor (11) and the other port B to remaining six
ports of the distributor.
・Cam ring (4) has six cam profiles on its inside srface (See P.2-024) along which the pistons move
to provide a rotary motion.
・Eight sets of pistons (3) are assembled into cylinder block (10) and the whole cylinder block
assembly is housed inside cam ring (4).
To Next Page
Loading...
