LR3/Disco 3
converter reaches this operational condition it ceases to multiply the engine torque and acts solely as a fluid coupling,
with the impeller and the turbine rotating at approximately the same speed.
The stator uses a sprag type, one way, freewheel clutch. When the stator is rotated in a clockwise direction the sprags
twist and are wedged between the inner and outer races. In this condition the sprags transfer the rotation of the outer race
to the inner race which rotates at the same speed.
One Way Free Wheel Clutch – Typical
The free wheel clutch can perform three functions; hold the stator stationary, drive the stator and free wheel allowing the
stator to rotate without a drive output. The free wheel clutch used in the 6HP26 transmission is of the sprag type and
comprises an inner and outer race and a sprag and cage assembly. The inner and outer races are pressed into their
related components with which they rotate. The sprag and cage assembly is located between the inner and outer races.
The sprags are located in a cage which is a spring which holds the sprags in the 'wedge' direction and maintains them in
contact with the inner and outer races.
Referring to the illustration, the sprags are designed so that the dimension 'B' is larger than the distance between the
inner and outer race bearing surfaces. When the outer race rotates in a clockwise direction, the sprags twist and the
edges across the dimension 'B' wedge between the races, providing a positive drive through each sprag to the inner race.
The dimension 'A' is smaller than the distance between the inner and outer race bearing surfaces. When the outer race
rotates in an anti-clockwise direction, the dimension 'A' is too small to allow the sprags to wedge between the races,
allowing the outer race to rotate freely.
On the illustration shown, when the outer race is rotated in a clockwise direction, the sprags twist and are 'wedged'
between the inner and outer races. The sprags then transfer the rotation of the outer race to the inner race, which rotates
Item Part Number
Description
1
-
Sprags
2
-
Inner race
3
-
Outer race
4
-
Sprag and cage assembly
5
-
Sprag outer race
6
-
Sprag inner race
7
-
Retaining ring
