Eaton Compressor & Fabrication C-STOV-MC001-E1 - Manual (Page 54)

54 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006
Torque Generator
Product Description
Continued
Open Center with Case Drain
This high pressure open
center torque generator
allows the exit flow from the
Torque Generator to operate
another function (for
example reach/tilt function
of a fork lift vehicle). An
external case drain is
needed to protect seals and
to allow for adequate
recentering of spool and
sleeve. The flow out the
case drain is internal leakage
only. This is a series circuit
with some special
characteristics that should
be noted:
• A relief valve is required
in the down stream
circuit as well as a relief
valve protecting the
torque generator.
• The pressures in this
circuit are additive. If it
takes 41 bar [600 PSI]
for steering and 55 bar
[800 PSI] for the reach
circuit, the pump will
see 96 bar [1400 PSI].
• The relief valve for
steering must always
be set higher than the
relief valve on the
downstream function
(reach). The margin
between the two must
be enough to provide
adequate steering in
the worst case (fork lift
stationary and
unloaded).
Anti-Friction Needle Bearings
Torque generators are
available with anti-friction
needle bearings at the
power end to allow for
direct mount sprockets or
pinions when compactness
of application does not allow
for outboard bearings.
Gerotor or Geroler ® Element
This is a fluid displacement
element, consisting of an
outer ring gear and an
internal star. Manual low
torque input actuates the
spool of the spring centered
spool and sleeve valve,
allowing high pressure oil to
turn the internal star. This
star is coupled with a splined
drive to the output shaft and
also the sleeve of the spool
and sleeve valve. High
pressure oil turning the star
in this gerotor or Geroler
element is generating high
output torque.
The Geroler elements have
not been offered on torque
generators in the past.
These Gerolers have rolls
incorporated into the outer
ring, and the rolls provide
rolling contact with the star
point, minimizing friction and
improving efficiency.
Limited Manual Steering
Relative deflection of the
input and output shafts is
limited mechanically within
the unit so that limited
manual steering
is still possible in the event
of power loss.
Reaction Torque Resistance
Customer supplied bracket
is required for reaction
torque resistance.
Case Drain
Direct Mechanical Link
Torque Generator
In
Out
Input Torque
Gerotor/Geroler
Output Torque
LS
Direct Mechanical Link
Torque Generator
In
Out
Input Torque
Gerotor/Geroler
Output Torque
Load Sensing
Open Center (with Case Drain)