Hydraulic Drive Systems for Engine Cooling Fans
Bucher Hydraulics has developed an ideal system based on tried and tested components. It consists of the AP external gear pump, the APFM fan drive motor and the ESLF 101 electronic control unit.
The external gear pump is available in various models and flange configurations, including those required for direct flange-mounting on all common internal combustion engines.
The fan drive motor is designed on the "building block" principle and can be supplied with the following options:
- Outrigger bearing to support radial and axial loads
- Integral anti-cavitation make-up valve
- Integral control valves that are regulated electro-proportionally, electrically on/off or thermostatically
- Drain port
- High-pressure shaft seal
- Right-hand, left-hand or reversible rotation
Advantages
- The internal combustion engine reaches its optimum operating temperature quickly
- Over-heating damage is prevented by monitoring and controlling up to 3 system values
- Fail-safe function in the event of system failure
- Demand-regulated cooling:
- less energy consumption
- lower noise levels - Reversible - leaves, dirt, etc. can be blown out of the radiator
Application
Technical data
AP200 external gear pump
Unit
Value
Pressure differential - constant
Geometric displacement
Fluid temperature
Viscosity range
Filter rating
bar
cm³/rev
°C
mm²/s
µm
220
4,3 - 25,9
-15 to +80
20 - 70
25 - 30
APFM200 fan drive motor
Unit
Value
Speed
Pressure differential - constant
Geometric consumption
Fluid temperature
Viscosity range
Filter rating
Maximum tank pressure
without drain line
rpm
bar
cm³/rev
°C
cm²/s
µm
bar
400-4000
220
8,5 - 26
-15 bis +80
20 - 70
25 - 30
20
Fan drive control unit
Unit
Value
Power supply
Temperature inputs
Temperature sensor
processing
Temperature control range
Diagnostics
Temperature range
V DC
PTC or NTC
using 2-wire
°C
LED for each
LEDs for
°C
12 - 28
3 (T1/T2/T3)
per card,
method
0 - 100
sol. output
control mode
-20 to +50
