08-03-2022, 01:52 AM
(This post was last modified: 08-03-2022, 04:59 AM by Tony Press.)
"I have a pair of R&M LJT1 angular contact bearings that fit in the separate housing of a D-Type back axle. I have fitted them with the 'thrust' engraved faces together. Is that correct?"
They should be mounted "back to back'
Angular Contact Brgs.jpg (Size: 7.3 KB / Downloads: 386)
In the case of your narrow outer ring bearings, if they were incorrectly mounted face to face there would be 60 thou preload !
Edit- This drawing shows the first AC bearing mounting with 'Ring Nut' or 'Outer Distance Piece', later changed to a two piece housing- see below.
The axial position of the pinion is governed by the outer rings of the angular contact bearings held in the torque tube housing.
All the original AC bearings fitted to the Austin 7 had outer rings 1/32" narrower on the non thrust side than the standard width inner ring and fitted back to back on the pinion.
All modern AC Bearings have outer and inner rings the same standard width.
With the outer ring narrowed by 1/32" on the non thrust side then the pinion is located 1/32" forward on the position it would occupy with a full width outer ring bearing.
The bearing housing is also relieved on the pinion side AC bearing so the pinion radial bearing takes the radial load.
Hope this clarifies the rather confusing pinion bearing AC mounting.
Edit- In 1933 the torque tube AC bearing mounting was changed. The Ring Nut or Outer Distance Piece was replaced by a two piece housing. With the bearing tolerances and housing machining tolerances this could cause a slight end float in the AC bearings which must be removed.
They should be mounted "back to back'
Angular Contact Brgs.jpg (Size: 7.3 KB / Downloads: 386)
In the case of your narrow outer ring bearings, if they were incorrectly mounted face to face there would be 60 thou preload !
Edit- This drawing shows the first AC bearing mounting with 'Ring Nut' or 'Outer Distance Piece', later changed to a two piece housing- see below.
The axial position of the pinion is governed by the outer rings of the angular contact bearings held in the torque tube housing.
All the original AC bearings fitted to the Austin 7 had outer rings 1/32" narrower on the non thrust side than the standard width inner ring and fitted back to back on the pinion.
All modern AC Bearings have outer and inner rings the same standard width.
With the outer ring narrowed by 1/32" on the non thrust side then the pinion is located 1/32" forward on the position it would occupy with a full width outer ring bearing.
The bearing housing is also relieved on the pinion side AC bearing so the pinion radial bearing takes the radial load.
Hope this clarifies the rather confusing pinion bearing AC mounting.
Edit- In 1933 the torque tube AC bearing mounting was changed. The Ring Nut or Outer Distance Piece was replaced by a two piece housing. With the bearing tolerances and housing machining tolerances this could cause a slight end float in the AC bearings which must be removed.