Overview of Clutches and Brakes
| Callout | Component Name |
|---|---|
| 1 | Output shaft gear |
| 2 | Intermediate shaft |
| 3 | Location of oil pump |
| 4 | Input shaft |
| 5 | Differential gear |
| 6 | Rear planetary gear unit: |
| 6a | Planet gear |
| 6b | Sun gear |
| 6c | Ring gear |
| 7 | Front planetary gear: |
| 7d | Planet gear |
| 7e | Sun gear |
| 7f | Ring gear |
| 7g | Lock |
| 8 | Planet carrier |
| 9 | Front sun gear in rear planetary gear unit |
| 10 | Rear sun gear |
| 11 | Front planet carrier |
| 12 | Front sun gear |
| b1 | Brake |
| b2 | Brake |
| c1 | Clutch |
| c2 | Clutch |
| c3 | Clutch |
| f1 | Free Wheel |
| Gear | Front planetary gear | Rear planetary gear unit |
|---|---|---|
| R | The planet carrier rotates clockwise at reduced speed. | The front sun gear rotates clockwise (C3). The planet carrier is braked (B2). The ring gear rotates counterclockwise with reverse gear ratio. |
| 1 | The planet carrier rotates clockwise at reduced speed. | The rear sun gear rotates clockwise (C1). The planet carrier is braked by the free wheel (and by B2 when engine braking). The ring gear rotates clockwise with 1st gear ratio. |
| 2 | The planet carrier rotates clockwise at reduced speed. | The rear sun gear rotates clockwise (C1). The front sun gear is braked (B1). The ring gear rotates clockwise with 2nd gear ratio. |
| 3 | The planet carrier rotates clockwise at reduced speed. | The rear and front sun gears rotate clockwise (C1 and C3). The planetary gear unit is locked and rotates as one unit. The ring gear rotates clockwise with 3rd gear ratio. |
| 4 | The planet carrier rotates clockwise at reduced speed. | The rear sun gear and planet carrier rotate clockwise (C1 and C2). The ring gear rotates clockwise with 4th gear ratio. |
| 5 | The planet carrier rotates clockwise at reduced speed. | The front sun gear rotates clockwise (C3). The planet carrier rotates clockwise (C2). The ring gear rotates clockwise with 5th gear ratio. |
| 6 | Not used | The planet carrier rotates clockwise (C2). The front sun gear is braked (B1). The ring gear rotates clockwise with 6th gear ratio. |
Gear changing performance is controlled by the applied element. When changing gear, it is not possible to apply more than one friction element for consistent behavior. In the same way, it is not possible to release more than one friction element when changing gear. This means it is not possible to change from one gear to an optional gear. The following shows the normal gear changing sequence from standstill:
| Gear Change | Applied Element |
|---|---|
| N to D (1) | Apply C1 |
| 1 to 2 | Apply B1 |
| 2 to 3 | Release B1, apply C3 |
| 3 to 4 | Release C3, apply C2 |
| 4 to 5 | Release C1, apply C3 |
| 5 to 6 | Release C3, apply B1 |
In this sequence you can clearly see that no more than 1 element is released or applied at one time. If you suddenly release the accelerator in 3rd gear after accelerating at full throttle, it is logical to change up to 6th gear.
Changing directly from 3 to 6, however, is not suitable because C1 and C3 must then be released and C2 and B1 applied. Changing 3 to 5 and 5 to 6 must be done instead. The need of these intermediate changes is especially noticeable during kickdown at various speeds. The permitted changing sequences are determined by a program in TCM.
The transmission is blocked mechanically in selector lever position P.