37-1-615 Page 39
FIGURE 7- 5 – ANGULAR CONTACT BEARING
ASSEMBLY
FIGURE 7-6
The CycloBlower is designed for no metal-to-metal contact
with parts within the housing. To achieve
this, some preliminary measurements are necessary before completing the assembly.
The first set of
measurements are used to determine the shaft shim set thickness necessary for positioning the
rotors in the housing to give the required clearance between the end of the rotors and the carrier
face at the discharge end.
End clearance is maintained at the discharge end by two angular contact
bearings, bearing spacer and shim set. The shaft shim set is determined as outline in Step 5 thru 8.
5. Install the shaft seal (18, 19), and fit the bearing spacers (16, 17) in the discharge end bearing
carrier (5) using the same method as outlined in Steps 1 and 2, page 40. To prepare for shim set
measurement, slip bearings into the bore and install bearing retainer plate (11, 12), FIGURE 7-6.
Bearing must be assembled as directed in Step 6
. Bearings are slip fit in the bore.
6. The angular contact bearings (29, 30) must be assembled as shown in FIGURE 7- 5, to assure a
“fixed” bearing. The marked face of the inner bearing is placed down in the bearing bore; the
marked face of the outer bearing is placed up.
7. Inspect bearing spacers for burrs on either end and polished area of O.D. Slip bearing spacer
through the shaft seal with the polished end toward the bearing. Make sure the spacer is resting
solidly against the bearing. With depth micrometer, measure the distance from the face of the
carrier to the end of each of the bearing spacers, FIGURE 7-7.
8. To the micrometer reading add the discharge end clearance shown in the clearance chart,
FIGURE 7-8, and .002 for crush fit of shims and parts. This sum gives the thickness of the shaft
shim set (22, 23) for positioning the rotor the required distance from the face of the carrier for
running clearance at the discharge end.