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smooth work of
smooth work of the torque converter.
the torque converter.
The torque converter, filled up with the torque converter oil, in the drive unit is driven
The torque converter, filled up with the torque converter oil, in the drive unit is driven
by an engine through a spring plate and flywheel on the engine. A charging pump is
by an engine through a spring plate and flywheel on the engine. A charging pump is
driven by a driving gear which is supplied by the pump. The power is transmitted to the
driven by a driving gear which is supplied by the pump. The power is transmitted to the
transmission through a turbine shaft spliced to the turbine.
transmission through a turbine shaft spliced to the turbine.
Fig 2.3 Torque converter
Fig 2.3 Torque converter
1. Spring
1. Spring
2. Turbine
2. Turbine
3. Impeller
3. Impeller
4.
4. Idler
Idler pulley
pulley
5.
5. One-way
One-way clutch
clutch
2.4 Hydraulic circuit (Fig 2.4)
2.4 Hydraulic circuit (Fig 2.4)
After
After the
the engine is
engine is started, the
started, the charging pump
charging pump inhales the
inhales the oil
oil from
from the
the oil
oil tank. The
tank. The
pressure oil from
pressure oil from the pump serves two parts
the pump serves two parts for hydraulic clutches and
for hydraulic clutches and torque converter
torque converter..
The oil necessary to operate the hydraulic clutches is divided into
The oil necessary to operate the hydraulic clutches is divided into two circuits through
two circuits through
the pressure valve (set pressure of 1.1-1.4MPa): one circuit flowing to the torque
the pressure valve (set pressure of 1.1-1.4MPa): one circuit flowing to the torque
converter via. a relief valve (set pressure of 0.5-0.7MPa) and another to the inching valve
converter via. a relief valve (set pressure of 0.5-0.7MPa) and another to the inching valve
and the slide valve. The oil out of the torque converter is cooled by an oil radiator and
and the slide valve. The oil out of the torque converter is cooled by an oil radiator and
used to lubricate the hydraulic clutches and finally returns
used to lubricate the hydraulic clutches and finally returns to the oil tank.
to the oil tank.
In the neutral, the circuit from the slide valve to the clutches is intermitted, and the
In the neutral, the circuit from the slide valve to the clutches is intermitted, and the
pressure valve is opened to let the oil only flow into the torque converter. When the slide
pressure valve is opened to let the oil only flow into the torque converter. When the slide
valve lies at its forward or backward position, the circuit form the slide valve to either the
valve lies at its forward or backward position, the circuit form the slide valve to either the
forward clutch or the backward clutch is closed accordingly, thus causing corresponding
forward clutch or the backward clutch is closed accordingly, thus causing corresponding
clutch come to work. When a clutch i
clutch come to work. When a clutch is at work, another must
s at work, another must stop working, i.e. its spacers
stop working, i.e. its spacers
and friction pieces must be disengaged each other and be lubricated and cooled. When
and friction pieces must be disengaged each other and be lubricated and cooled. When
the inching valve is operated through stressing the inching pedal, apart or most of the oil
the inching valve is operated through stressing the inching pedal, apart or most of the oil
in the clutches flows into the oil tank through the inching valve rod. The oil circulation for
in the clutches flows into the oil tank through the inching valve rod. The oil circulation for
the torque converter then is the same as that in the neutral
the torque converter then is the same as that in the neutral
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