Functional Description - Planetary Gear Components

Transmission Components 

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1st GEAR  Engagement elements activated: A, B and C Turbine shaft → clutch C → sun gear 4 → planet gears 4 → planet carrier 4.

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2nd GEAR  Engagement elements activated: A, B and E Turbine shaft → planet carrier 2 → planet gears 2 → crown gear 2 → clutch E → sun gear 4 → planet gears 4 → planet carrier 4.

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3rd GEAR 

Engagement elements activated: B, C and E.

• Turbine shaft → clutch C → sun gear 4 → planet gears 4 → epicyclic gear train 4.
• Clutch C → clutch E → internal crown gear C2 → planet gears 2 (EP2 is blocked since C2 and PT2 are connected through clutches C and E).
• Turbine shaft → planet carrier 2 (EP2 blocked) → sun gear 1 → planet gear 1 → planet carrier 1 → internal crown gear 4.

The connection from the epicyclic gear train EP1 to the internal crown gear H4 produces a corresponding transmission ratio in the epicyclic gear train EP4 (see force flow in 1st gear).

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4th GEAR 

Engagement elements activated: B, D and E.

• Clutch E blocks the epicyclic gear train EP3 and clutch D and EP3 being blocked cause the epicyclic gear train EP4 to be blocked (gear trains 3 and 4 rotate at the same speed = output.
• Turbine shaft → planet carrier 2 → planet gears 2 → sun gears 1 / 2 → planet gears 1 →planet carrier 1 → internal crown gear 4 → planet gears 4 → planet carrier 4.

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5th GEAR 

Engagement elements activated: B, C and D.

• Turbine shaft → clutch C → sun gear 4 + internal crown gear 3 (EP2, C2 and S4 = turbine speed).
• Clutch D connect epicyclic gear train 3 to epicyclic gear train 4 (= output shaft).
• Turbine shaft → planet carrier 2 → planet gears 2 → sun gears 1 / 2 → planet gears 1 → planet carrier 1 → internal crown gear 4 → gives a behavior that depends on the speed ratio of S4 (= turbine speed) to C4 with the corresponding speed on PT4.

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6th GEAR 

Engagement elements activated: C, D and E.

• Clutches D and E block epicyclic gear trains EP3 and EP4.
• The torque is applied to the epicyclic gear set through clutch C.
• The whole epicyclic gear set rotates at the same speed as the turbine (blocked).

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7th GEAR 

Engagement elements activated: A, C and D.

• Turbine shaft → clutch C → sun gear 4 + internal crown gear 3 (= turbine speed).
• Turbine shaft → planet carrier 2 → planet gears 2 → internal crown gear 2 → sun gear 3 → planet gears 3 → planet carrier 3 → clutch D → planet carrier 4.
• Clutch D connects the epicyclic gear train EP3 to planet carrier PT4 (= output shaft).

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8th GEAR 

Engagement elements activated: A, D and E.

• Clutch E blocks epicyclic gear train EP3.
• Turbine shaft → planet carrier 2 → planet gears 2 → internal crown gear 2 → epicyclic gear train EP3 (blocked) → clutch D → planet carrier 4.
• Clutch D connects planet carrier 3 to planet carrier 4 (= output shaft).

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REVERSE GEAR 

Engagement elements activated: A, B and D.

• Clutch D connects planet carrier 3 to planet carrier 4 (= output shaft).
• Turbine shaft → planet carrier 2 → planet gears 2 → internal crown gear 2 → sun gear 3 → planet gears 3 → planet carrier 3 → clutch D → planet carrier 4.
• Internal crown gear C3 is firmly fixed to sun gear S4.
• S4 drives P4 in the opposite direction to that of the engine.
• Gears P4 roll around fixed C4, rotating PT4 with the transmission ratio indicated in the opposite direction to that of the engine.

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