3.1 General description
3.1 General description
3.2 Torque converter
3.2 Torque converter
The transmission adopted in this machine is a rational combination of torque
The transmission adopted in this machine is a rational combination of torque
converter with power-shift type transmission.It has the following features.
converter with power-shift type transmission.It has the following features.
(1) The inching valve is provided so as to improve the inching performance.Hence,the
(1) The inching valve is provided so as to improve the inching performance.Hence,the
inching performance can be maintained when starting and at any rotational speed of
inching performance can be maintained when starting and at any rotational speed of
engine.
engine.
(2) The clutch has 7 steel plates and 7 specially treated paper plates.Therefore
(2) The clutch has 7 steel plates and 7 specially treated paper plates.Therefore
excellent durability is ensured.
excellent durability is ensured.
(3) The torque converter is provided with the free wheel so as to enhance the
(3) The torque converter is provided with the free wheel so as to enhance the
transmission efficiency(3-element,1-stage,2-phase type).
transmission efficiency(3-element,1-stage,2-phase type).
(4) The line filter is provided in the torque converter circuit so as to improve the
(4) The line filter is provided in the torque converter circuit so as to improve the
durability.
durability.
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shaft,turbine wheel fitted to the output shaft,and stator wheel fixed to the housing(3-
shaft,turbine wheel fitted to the output shaft,and stator wheel fixed to the housing(3-
element,1-stage type).
element,1-stage type).
The pump wheel is rotated by the drive shaft,so that the fluid in the pump forced out
The pump wheel is rotated by the drive shaft,so that the fluid in the pump forced out
by the centrifugal force along the vanes of
by the centrifugal force along the vanes of
pump wheel.(At this time mechanical energy is
pump wheel.(At this time mechanical energy is
converted to kinetic energy).
converted to kinetic energy).
Thereby the fluid flows into the impeller of turbine wheel,transmitting torque to the
Thereby the fluid flows into the impeller of turbine wheel,transmitting torque to the
output shaft.The direction of thr fluid leaving the turbine wheel is changed by the stator
output shaft.The direction of thr fluid leaving the turbine wheel is changed by the stator
wheel so that it flows into the pump wheel at the best angle.At this time a
wheel so that it flows into the pump wheel at the best angle.At this time a
reaction torque
reaction torque
pushing the stator is generated,as a result of
pushing the stator is generated,as a result of
which the output torque becomes larger than
which the output torque becomes larger than
the input torque by the valve equal to the
the input torque by the valve equal to the
reactio
reactio
n torque.
n torque.
As the rotational speed of turbine wheel increases,approaching to the input rotational
As the rotational speed of turbine wheel increases,approaching to the input rotational
speed,the change of fluid flow angle reduces,and the output shaft torque also reduces.And
speed,the change of fluid flow angle reduces,and the output shaft torque also reduces.And
finally the fluid begins to flow contrary to
finally the fluid begins to flow contrary to
the direction of stator vanes,as a result of
the direction of stator vanes,as a result of
which
which
the reaction torque beings to affect in the reverse direction.
the reaction torque beings to affect in the reverse direction.
In this case the output shaft torque becomes smaller than the input shaft torque.So as
In this case the output shaft torque becomes smaller than the input shaft torque.So as
to prevent this phenomenon,a free wheel(one-way clutch) is provided on the stator. When
to prevent this phenomenon,a free wheel(one-way clutch) is provided on the stator. When
the reaction torque acts in the
the reaction torque acts in the
reverse direction,the stator wheel rotates idly.In this state
reverse direction,the stator wheel rotates idly.In this state
the input torque becomes equal to the output torque so that high performance is ensured.
the input torque becomes equal to the output torque so that high performance is ensured.
As the phase of torque transmission is changed by the mechanical means (clutch),the
As the phase of torque transmission is changed by the mechanical means (clutch),the
torque converter is called the 2-phase type.It features smooth operation and enhanced
torque converter is called the 2-phase type.It features smooth operation and enhanced
efficiency.
efficiency.
The torque converter is fixed to the flywheel through the flex plate so that it rotates
The torque converter is fixed to the flywheel through the flex plate so that it rotates
always together with the engine.
always together with the engine.
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-45-
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