GF27.51-P-5106ACW Overrunning Clutch, Component Description

GF27.51-P-5106ACW Overrunning clutch, component description
- TRANSMISSION 722.618/640/646/695/699

Component Identification:

Location
In the front planetary gear set the overrunning clutch F1 (27) is installed between the front sun gear (29/1) and the stator shaft (8) and in the rear planetary gear set the overrunning clutch F2 (28) is installed between the rear sun gear (31/1) and the intermediate shaft
(3).

Tack
Overrunning clutches F1 and F2 (27, 28) are used to optimize individual gearshifts. They support individual elements of a planetary gear set in a particular direction of rotation against each other or against the transmission housing and thus enable torque transmission.

Component Identification:

Design
Overrunning clutches F1 and F2 (27, 28) consists of an outer ring (12), an inner ring (13), several sprags (14) and a sprag cage (15).

Function
If the inner race (13) of the overrunning clutch is locked and the outer race (12) turns in direction "A", the locking elements (14) adopt a diagonal position on account of their special contours, thereby allowing an overrunning clutch function.

The outer race (12) slides over the sprags (14) with negligible friction. If the rotation of the outer race (12) changes to direction "B", the locking elements (14) stand up and lock the outer and inner races (12, 13) together.