Toyota 7M-GE Repair Manual page 354

TD-138
2) Operation
BODY - FRONT SEAT. ~
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._
0 If the reclining adjuster knob is turned, the sprocket, which.is linked to the knob by a chain,
and the hinge pin, which is linked to the sprocket by seriations, are turned.
l
As
the hinge pin rotates it raises the upper arm by &ding it against the inner gear.
0 Since the inner gear is fastened to the seat cushion side, (except when the Quick System is
operating), center 0, of the upper arm crown gear fastened .to the seat back turns with center
O1 of the inner gear as its axis.
: .
0 Therefore, the upper arm crown gear turns around the inner gear by the turning of the hinge
pin. Furthermore, when the hinge pin has made N turns, the reclining angle of the seat back
can be expressed by the flowing formula.
'2 - '1 x 360"
;I
: Reclining Angle, N : No. of Turns of Hinge Pin
a=Nx z
: No. of Inner Gear Teeth (29)
2
z,
: No. of Crown Gear Teeth (30)
(? Therefore, cy = 12" x N and one turn of the hinge pin reclines the seat back 12".
6"
9"
12"
Hinge Pin Angle : 180" 270"
360"
(One Turn of
Hinge Pin)