TORQUE CONVERTER - TM-5-3805-260-24

PLANETARY TRANSMISSION - TM-5-3805-260-24_153

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
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TM 5-3805-260-24 TORQUE CONVERTER The torque converter connects the engine to the planetary transmission. This connection between the engine and the transmission is a hydraulic connection. There is no direct mechanical connection between the engine and the transmission. The torque converter uses oil to send torque from the engine to the transmission. When the machine is working against a load, the torque converter can multiply the torque from the engine and send a higher torque to the transmission. POWER FLOW THROUGH TORQUE CONVERTER 1. Torque converter housing. 2. Flywheel adapter gear. 3. Gear for the transmission oil pump. 4. Rotating housing. 5. Drive gear for the oil pumps. 6. Stator. 7. Outlet passage. 8. Carrier. 9. Output shaft. 10. Inlet passage. 11. Turbine. 12. Gears (two) for the hydraulic pump. 13. Impeller. The oil for the operation of the torque converter comes from the oil pump for the transmission. The oil pump is driven by gear (3) and gear (5). An inlet ratio valve (part of the pressure control valve in the transmission) controls the maximum oil pressure to the torque converter. An orifice in the outlet passage controls the minimum oil pressure in the torque converter. The rotating housing (4) is connected to the engine flywheel with splines of gear (2). The impeller ( 13) and the drive gear (5) for the oil pump are connected to the rotating housing. These components turn with the engine flywheel at engine speed. The stator (6) is connected to the carrier (8) which is connected to the torque converter cover. The stator does not turn. The turbine (11) is connected to the output shaft (9). Drive gear (5) is fastened to the impeller and turns the gears (3) and (12) for the oil pumps. Oil from the hydraulic controls of the transmission goes into the torque converter through an inlet passage (10) in the carrier (8). The impeller (13) [which turns with the rotating housing (4) at engine speed] makes the oil go toward the outside of the impeller, around the inside of the rotating housing (4), and against the blades of the turbine (11). The oil that hits the turbine blades causes the turbine (11) and the output shaft (9) to turn. This sends torque through a drive shaft to transfer gears and to the input shaft of the transmission. TORQUE CONVERTER 4. Rotating housing. 6. Stator. 11. Turbine. 13. Impeller. After the oil hits the turbine blades, the oil goes toward the inside of the turbine (11). As the oil goes from the turbine, it moves in a direction opposite the direction of impeller rotation. The stator (6) causes the oil to change direction and go back into the impeller (13) in the direction of rotation. This gives an increase to the impeller oil output which gives an increase to the torque output from the turbine (11). The larger the difference between the speeds of rotation of the impeller (13) and the turbine (11) the larger the output torque becomes. Oil from the outlet passage (7) goes to the oil cooler. 2-83

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