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HOMESERVICE MANUALSMINI2013COOPER COUNTRYMAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 166 (STANDARD/AUTOMATIC TRANSMISSION - OVERVIEW)TRANSMISSION HYDRAULICSPOWER FLOW SCHEMATICPOWER FLOW IN FIRST GEAR
2013 Mini Cooper Countryman, Standard Trans

Power Flow In First Gear

2013 Mini Cooper Countryman, Standard TransSECTION Power Flow In First Gear
WARNING: This page does not describe the selected car, but rather 212 other vehicles, including the 2012 BMW 750i, 2012 BMW 750Li, 2011 BMW M3, 2011 BMW 750i, and 2011 BMW 750Li. However, it is still accessible from the selected car via links, so may be relevant.

Drive torque is applied to the torque converter impeller and transferred to the turbine. The turbine shaft rotates clockwise (CW). The "A" clutch locks the turbine shaft to the rear input ring gear. The rear input ring gear rotates CW driving the rear planet pinions CW. The planetary pinions drive the common sun gear CCW, which in turn drive the front planet pinions CW. The front planetary carrier is held from rotating CCW by one way clutch "J". The front planetary pinions which are rotating CW drive the front ring gear/rear carrier CW. The rear planetary carrier is rotating CW and is driving the planetary carrier from the auxiliary gear set. The "E" clutch in the auxiliary gear set is holding the Sun gear and the ring gear together. Therefore the auxiliary gear set is locked in a 1:1 ratio. See Fig 1.

One Way Clutch "J" is locked to prevent the front planetary carrier from rotating CCW. One Way Clutch "H" is not used and One Way Clutch "K" is locked. One way clutch "K" is used to prevent an interruption in power flow before the "E" clutch is locked during the 4-3 shift. See Fig 2.

Fig 1: Power Flow Schematic In First Gear
G00317044Courtesy of BMW OF NORTH AMERICA, INC.
RENDER: 1.0x

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