El Alf Y Yo

21

Chapter 5

THE EPICYCLIC GEAR TRAIN

I-

DESCRIPTION To provide the four forward gears and one reverse gear, the AL4 automatic transmission has a SIMPSON type epicyclic gear train. Thisconsists of two simple epicyclic gear trains connected together. There are: • two sunwheels P1 and P2, • two sets of planet wheels S1 and S2, • two planet wheel carriers PS1 and PS2, • two rings C1 andC2. The two gear trains are connected in the following manner: • planet wheel carrier PS1 and ring C2 are connected together, • planet wheel carrier PS2 and ring C1 are connected together. Gear trainn° is located on the rear housing side. 1 Gear train n° is located on the converter side; the movement systematically exits 2 through its planet wheel carrier PS2.

F1 E1 E2 C1 S1 P1 PS1 P2

F2C2

F3 S2

Primary pinion of the step down gear Movement input housing PS2

AL4014D

AL4 AUTOMATIC TRANSMISSION
© AUTOMOBILES CITROËN Toute reproduction ou traduction même partielle sansl'autorisation écrite d'AUTOMOBILES CITROËN est interdite et constitue une contrefaçon

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Chapter 5

Secondary pinion of the step down gear

P2

C2

PS1

P1 Connection with PS1

PS2 C1AL4015P

Primary pinion of the step down gear

Gear train specifications Sunwheel P1 Sunwheel P2 Planet wheel S1 Planet wheel S2 Ring C1 Ring C2
AL4 AUTOMATIC TRANSMISSION

33 teeth 40 teeth 21teeth 19 teeth 81 teeth 80 teeth

© AUTOMOBILES CITROËN Toute reproduction ou traduction même partielle sans l'autorisation écrite d'AUTOMOBILES CITROËN est interdite et constitue une contrefaçon23 II OPERATING PRINCIPLE 1st gear

Chapter 5

F1 E1 C1 E2 PS1

F2

F3

C2 PS2

P P des P1 P2

Lock-up

P P des = Primary step down pinion

AL4016D

Primary

2nd gear

F1 E1C1 E2 PS1

F2

F3

C2 PS2

P P des P1 P2

Lock-up

P P des = Primary step down pinion

AL4017D

Primary

AL4 AUTOMATIC TRANSMISSION
© AUTOMOBILES CITROËN Toute reproduction ou...