06-06-2018, 07:50 AM
(This post was last modified: 08-06-2018, 03:18 AM by Tony Press.)
(06-06-2018, 07:30 AM)bob46320 Wrote: As I understood it, the rollers give you axial support (Ie front and rear roller bearings) and the ball race gave you longitudinal support. The thinking is that the roller bearings give a better load support than ball bearings as there is more bearing contact to take the thrust of the piston rods etc.
Yes- radial not axial for the roller bearings and of course standard roller bearings have no axial capacity.
The sometimes suggested self-aligning ball bearings are very poor in thrust and size for size much lower radial capacity compared to roller bearing loads
The later crankshaft has two 'angular contact' ball bearings at the front - because of the internal design, these bearings have a greater complement of balls than the corresponding single row ball bearing- they can take greater thrust load and mounted as a pair greater radial load than a pair of ball bearings.
No standard Austin 7 crankshaft bearing assembly has allowance for crankshaft 'bending'.
Cheers, Tony.