Yale A7S1, Service Manual

Page: 19 / 100

1. GEAR SHAFT
2. TAPERED ROLLER BEARING
3. TORQUE CONVERTER HOUSING ASSEMBLY
4. OIL PUMP ASSEMBLY
5. COVER AND CONTROL VALVE ASSEMBLY
6. CLUTCH ASSEMBLY
7. BEARING PLATE
8. HOUSING
9. IDLER SHAFT
10. OUTPUT SHAFT
11. IDLER GEAR
12. OUTPUT GEAR
13. HYDRAULIC TOR-CON CONVERTER
14. INCH VALVE ASSEMBLY
15. DIFFERENTIAL ASSEMBLY
16. SPIRAL BEVEL GEAR
17. BEARING CAP
Figure 7. Hydraulic Transmission Device
TORQUE CONVERTER
The torque converter is composed of three parts, a
pump impeller, turbine, and guide pulley.
Pump impeller is driven by the input shaft. The fluid is
sprayed onto the blades of turbine and along the pump
impeller blades by centrifugal force. Torque is then
provided to output shaft. The fluid exiting the turbine
changes direction to the guide pulley. Reactive torque
is then generated to push the guide pulley causing the
output torque to be greater than the input torque. If the
fluid flows into the blades of guide pulley in reverse
direction, it causes the reactive torque to act in
reverse. This causes the torque of output shaft to be
less than the input shaft torque. To prevent this, the
clutch mounted inside the guide pulley allows the
guide pulley to rotate freely when reactive torque is
reversed.
This method of torque conversion ensures a high-
efficient and steady operation.
The torque converter for the transmission is connected
with the flywheel of engine through an elastic plate, it
turns along with the rotation of the engine. Oil fills the
torque converter. The drive gear is connected to the
pump impeller by gear teeth, this controls the oil feed
pump. The oil feed pump then supplies oil to the
torque converted and the hydraulic shifting
transmission case. The turbine is connected to the
turbine shaft with splines. Power is transmitted to the
power gear-shift transmission case through the turbine
shaft.
8000 YRM 2199 Hydraulic Transmission Case and Torque Converter
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