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The hydraulic system is the part of the Selespeed that in the
practical sense, has the task of the selection - engagement of the
required gear.
Basically it consists of:
• A power group to pressurise the circuit
• Two actuators to control the gear shaft
• An actuator to control the clutch
• Sensors for system monitoring by the control unit
The hydraulic system has these functions:
1. To supply the hydraulic energy needed to control the actuators
2. Gear shaft control
3. Clutch control
The fundamental function of the hydraulic system is to supply the
hydraulic energy to control the actuators (gear change). Therefore
the possibility to change gear is tightly bound to the pressure of
the oil in the circuit, with values between 45 and 55 bar.
The main
technical specifications that are necessary for the system to ensure
correct operation are:
• Hydraulic working pressure between 45 and 55 bar (there is a
pressure relief valve to avoid system over-pressure)
• Working temperature between -30°C and +125°C
• Starting must also be possible with a temperature of -30°C
• The pump flow rate must be 0.8l/min at 60°C
• The accumulator volume must be 350 cm3 at 20°C (this value is
important because it determines the discharge time)
• The oil used is Tutela CS Speed. |
