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Installation and Maintenance Manual, Compact CA
1.3 Functional description
1
3
4
5
6
7
D
8
A, C
Fig. 1 The COMPACT CA motor
10
9
11
Hägglunds hydraulic industrial motor COM-
PACT CA is of the radial-piston type with a
rotating cylinder block/hollow shaft and a sta-
tionary housing. The cylinder block is mounted
in fixed roller bearings in the housing. An even
number of pistons are radially located in bores
inside the cylinder block, and the valve plate
directs the incoming and outgoing oil to and
from the working pistons. Each piston is wor-
king against a cam roller.
When the hydraulic pressure is acting on the
pistons, the cam rollers are pushed against the
slope on the cam ring that is rigidly connected
to the housing, thereby producing a torque.The
cam rollers transfer the reaction force to the
piston which are guided in the rotating cylinder
block. Rotation therefore occurs, and the torque
available is proportional to the pressure in the
system.
Oil main lines are connected to ports A and C
in the connection block and drain lines to ports
D1, D or D3
in the motor housing.
The motor is connected to the shaft of the
driven machine through the hollow shaft of
the cylinder block.The torque is transmitted by
using a mechanical shaft coupling, or alterna-
tively by splines.
The symmetrical design of the motor has made
it possible to design it as a two displacement
motor. This means that two different speeds
can be obtained for a given flow. The simplest
way of performing displacement change is by
connecting a special valve, direct to the flange
face on the connection block.
Valid patents
US 45110, US 00597995A, SE 456517,
EP 010915, JP 8316704, GB 1385693,
EP No 054437.
Quality
To assure our quality we maintain a Quality
Assurance system, certified to standard ISO
9001, EN 9001 and BS 5750; Part 1.
General
1. Cam ring
. Cam roller
3. Piston
4. Shaft coupling
5. Cylinder block /
hollow shaft
6. Cylinder block / spline
7. Front end cover
8. Cylindrical roller
bearing
9. Connection block
10. Valve plate
11. Axial bearing
A = inlet or outlet port »A«
C = inlet or outlet port »C«
D = drain port
F4 = Flushing
F4
