NorAM 65E Turbo Motor Grader, Руководство по обслуживанию

Страница: 161 / 830

ERGOPOWER
Geschäftsbereich
Arbeitsmaschinen-Antriebe
und Achssysteme
14
ZF-Fine filter:
Filtration ratio according to ISO 4572:
ß
30
> 75 ß
15
= 25 ß
10
= 5.0
Filter surface at least: 6700 cm
2
Dust capacity according to ISO 4572 at least: 17 g
The six clutches of the transmission are selected via the 6 proportional valves P1 to P6.
The proportional valve (pressure regulator unit) is composed of pressure regulator (e.g. Y6),
follow-on slide and vibration damper.
The control pressure of 9 bar for the actuation of the follow-on slides is created by the pressu-
re reducing valve. The hydraulic oil (16+2 bar) is directed via the follow-on slide to the
respective clutch.
Due to the direct proportional selection with separate pressure modulation for each clutch, the
pressures to the clutches, which are engaged in the gear change, will be controlled. In this
way, a hydraulic intersection of the clutches to be engaged and disengaged becomes possible.
This is creating spontaneous shiftings without traction force interruption.
At the gear change, the following criteria will be considered:
- Speed of engine, turbine, central gear train and output.
- Transmission temperature.
- Shifting mode (up-, down-, reverse shifting and speed engagement out of Neutral).
- Load condition (full and part load, traction, overrun inclusive consideration of load cycles
during the gear change).
The main pressure valve is limiting the max. control pressure to 16+2,5 bar and releases the
main flow to the converter and lubricating circuit.
In the inlet to the converter, a converter safety valve is installed which protects the converter
from high internal pressures (opening pressure 11+2 bar).
Within the converter, the oil serves to transmit the power according to the well-known hydro-
dynamic principle (see Chapter Torque converter 1.1).
To avoid cavitation, the converter must be always completely filled with oil.
This is achieved by a converter pressure back-up valve, rear-mounted to the converter, with an
opening pressure of about 4,3+3 bar.
The oil, escaping out of the converter, is directed to a heat exchanger.
The selection and definition of the heat exchanger must be carried out according to our Instal-
lation Specification for hydrodynamic powershift transmissions by the Customer on his own
responsibility.
The heat exchanger is not within the scope of supply of the
ZF Passau GmbH.
From the heat exchanger, the oil is directed to the transmission and there to the lubricating oil
circuit so that all lubricating points are supplied with cooled oil.
In the Electrohydraulic control unit, are 6 pressure regulators installed – see Table-9.
The allocation of the pressure regulators to the single gears can be seen on the Tables 4 and 5.