There are various types of planetary gear units. Here, typical planetary gear units are:
1. 3-speed + O/D type (FF vehicles)
By combining a 3-speed planetary gear unit with an O/D gear unit, four Read more Types of Planetary Gear Unit
Automatic Trans
What is Overdrive Gear Unit?
The overdrive gear unit is an independent planetary gear unit with a gear ratio less than 1.0 (approx. 0.7-0.8). It is combined with a conventional 3-speed planetary gear unit and is equivalent to the Read more What is Overdrive Gear Unit?
Operations of Planetary Gear Unit
1. 1st gear
(1) The input shaft turns the front planetaryring gear clockwise by C1.
(2) The front planetary pinion gear turns and revolves and makes the sun gear turn counterclockwise.
(3) In the rear Read more Operations of Planetary Gear Unit
What is Clutches (C1 and C2) Construction?
The clutches connecting and disconnecting the power are C1 and C2. The clutch C1 acts to transmit power from the torque converter to the front ring gear via the input shaft. The discs and plates are lined Read more What is Clutches (C1 and C2) Construction?
What is Brakes (B1, B2 and B3)?
There are two types of brakes fixing elements: the band type and the wet multiple-disc type. The band type is used for the B1 brake and the wet multiple-disc type for the B2 and B3 brakes. In some automatic Read more What is Brakes (B1, B2 and B3)?
What is Planetary Gear Unit?
In automatic transaxle vehicles, the planetary gear unit handles deceleration, reverse, direct connection, and acceleration. The planetary gear unit consists of the planetary gears, clutches, and brakes. Read more What is Planetary Gear Unit?
What is Lock-up Clutch Mechanism?
The lock-up clutch mechanism connects the engine power directly and mechanically to the automatic transaxle. Since the torque converter uses the fluid flow to transmit the power indirectly, there are power Read more What is Lock-up Clutch Mechanism?
Torque Converter Operation
A general description of torque converter operation when the shift lever is shifted into a “D”, “2”, “L” or “R” is given below.
1. Engine idling, vehicle stopped
When the engine is idling, Read more Torque Converter Operation
Stator One-way Clutch Function
The direction of the fluid entering the stator from the turbine runner depends on the difference in the rotational speeds between the pump impeller and turbine runner.
1. When the rotation speed difference Read more Stator One-way Clutch Function
Stall Point and Clutch Point
1. Stall point
The stall point refers to the situation in which the turbine runner is motionless. The difference in rotation speeds between the pump impeller and the turbine runner is at a maximum. Read more Stall Point and Clutch Point