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CONSTRUCTION AND FUNCTION 7A1-13
2-4 Brake and Low & Reverse Brake (Multi-Plate Brake) • The multi-plate brake is composed of drive plates and driven plates. By applying the oil pressure onto the end surface of the plates, the clutch is engaged or disengaged. The oil pressure is adjusted with the • All brakes use dish plates to prevent uncontrolled operation of the clutches when engaged, causing a shock. • The solenoid in the control valve is driven based on the speed change signal from TCM and moves the shift valve, thereby engaging the drive plate and driven plate through the piston of each clutch. • Resultantly, rotation of each element of the planetary gear unit is fixed. • When the oil pressure is removed, the piston returns to the original position by the force of the return spring.
Figure 19. Construction of 2-4 Brake
Figure 20. Construction of Low & Reverse Brake
Low One-way Clutch • The low one-way clutch employs the sprag which locks the counterclockwise rotation of the front planetary carrier and rear internal gear. • The one-way clutch outer race is fitted with the low clutch drum and the inner race with the transmission case. • The outer race rotates freely clockwise but, when it attempts to rotate counterclockwise, the sprag functions to lock the outer race. • When the vehicle is traveling in 1st gear in the D, 3 or 2range, the low one-way clutch locks the rear internal gear via the low clutch. It is left free in the 2nd, 3rd or 4th gear position.
Figure 21. Construction of Low One-way Clutch |