Eaton Compressor & Fabrication C-STOV-MC001-E1 - Manual (Page 16)

• Manual Steering
Steering a vehicle with
loss of engine power may
not be possible with a
large displacement
steering control unit (SCU).
Q-Amp with manual
feature has the smaller
displacement required for
manual steering and has
the additional flow
requirement of the larger
displacement SCU for
power steering.
• Single Cylinder
(Unequal area)
On vehicles with one single
unequal area cylinder the
steering wheel turns lock to
lock are more in one
direction than the other.
When extending the rod one
would get more turns than
when retracting it. A
different Q-Amp ratio while
turning in one direction
versus the other can be
used to give an equal
number of turns lock to lock
in each direction.
Eaton Patented
Technologies
Q-Amp (Flow
Amplification)
for Load Sensing
Circuits
Pump
Rotary
Valve
Meter
Cylinder
Slow
Turn
No Flow
Description
Q-Amp steering units have
built in variable orifices
that provide flow directly to
the cylinder without going
through the gerotor section.
The orifices do not open
until after the gerotor begins
to rotate and then gradually
open until the desired flow
is achieved which is
proportional to the flow
going through the gerotor. A
typical Q-Amp unit has a
ratio of 1.6 : 1 which means
the flow of the cylinder is
1.6 times the flow going
through the gerotor when
turning the steering wheel
at medium to fast speeds.
(See model code for
available ratios.)
Covered by one or more of the following U.S.
and foreign Patents: 4759182, 4862690,
4781219. Unequal area Q-Amp.
10
1
2
3
Turns
Lock
to
Lock
Ratio
1:1
2:1
1.6:1
4
5
6
20 30 40 50
RPM
60 70 80 90 100
10 20 30 40 50
RPM
60 70 80 90 100
Q-Amp Steering Control Unit—Slow Turn
Features
• Variable Ratio
Pump
Rotary
Valve
Meter
Cylinder
Fast
Turn
Rotary
Valve
Meter
Cylinder
Pump
Fast
Turn
Q-Amp Steering Control Unit—Fast Turn
Conventional Steering Control Unit
16 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006