ENGINE AR 1W3878 - Caterpillar

Illustration 1 g03507383
(1) Flange (input shaft)
(2) Housing
(3) Turbine
(4) Stator
(5) Impeller
(6) One-way clutch
(7) Output shaft
(8) Hub
(9) Lockup Clutch The torque converter is driven by the engine flywheel. The torque converter consists of an impeller (5), a turbine (3), a lockup clutch (9), and a stator (4) with a one-way clutch (6). The lockup clutch permits the machine to operate in direct drive in order to keep the power loss at a minimum. The one-way clutch holds the stator when the torque converter drive is used. The one-way clutch allows the stator to turn freely when direct drive is used.The torque converter case is fastened to the flywheel case for the engine. Output shaft (7) connects the torque converter to the transmission planetary group.The engine flywheel turns flange (1), rotating housing (2) and impeller (5). The impeller directs oil onto the blades of turbine (3) causing the turbine to turn. The turbine directs the oil onto stator (4).
Illustration 2 g01005408
(10) Race
(11) Cam
(12) Spring
(13) Slot
(14) Cam Surface
(15) Roller Stator (4) is connected to cam (11) by the spline. When hydraulic oil tries to move the stator in opposite direction to the turbine, rollers (15) are forced into the narrow end of slot (13). These rollers prevent the cam and stator assembly from rotating around the carrier. Since the cam is held stationary, the stator cannot turn and the one-way clutch is locked up. The stator now directs most of the oil back to the impeller. The remainder of the oil goes out of the