Sizing Toothed/Synchronous Belts for prop drive

[malcolmd]

Hi "CB", sorry for slight delay...lets see if I can answer your questions...

First some parts...

Here are the pulleys with Taperlock bushes and one of the Pillow Block Bearings (Actually 2 of these I had in stock and were RHP of the same dimensions). All of these supplied by BearingBoys [url]http://www.bearingboys.co.uk,[/url] who have been very reliable.. the part reference will allow you to find the bits on their site.


Product / Reference ID Unit Cost Total Cost
1 x 2012-1.1/4 Taper Bush (Dunlop) (2012-1.1/4-Dunlop) 2375 £5.38 £5.38
1 x 2517-1.1/4 Taper Bush (Dunlop) (2517-1.1/4-Dunlop) 2404 £6.76 £6.76
1 x UCP207-20 Medway 1.1/4inch Pillow Block Bearing (UCP207-20-Medway) 10796 £18.12 £18.12
1 x 56-8M-30 Taperlock Timing Pulley (56-8M-30 ) 21506 £32.71 £32.71
1 x 64-8M-30 Taperlock Timing Pulley (64-8M-30 ) 21507 £38.37 £38.37

One of the pillow block bearings is being used as a thrust bearing, these are just 1.25" I/D self-aligning deep groove ball bearings - I did some sums (see Steamboating handbook for thrust computations) and researched their load capacities on RHP's web site and persuaded myself that these would take the axial thrust of the prop without any trouble... (Wiser members on the forum may disagree! :-/ )

The CV joint came from Ebay (see this link http://r.ebay.com/OKFzlc and is listed as being "FORD SIERRA 4WD XR 4X4 REAR DRIVE SHAFT CV JOINT & BOOT KIT 100MM".

The flexible coupling was purchases second hand at an SBA auction, so I don't have a part number, sorry.
I had to spine a shaft to fit into the CV joint and also mate it to the flex-coupling, all described here: https://sy-befur.co.uk/2016/04/12/drive ... e-cutting/ in the blog.


Hope that helps....

[cyberbadger]

This is what worked for Nyitra's Launch. But It was limited to 3mph - The tensioning was not high enough and it would skip a timing belt tooth with the torque of beyond 2-3mph.
I plan to add a tensioner. Other than that it was great.



Mcmaster part numbers: 6495K18 - Both L series timing belt Pulleys. L Series Belt: 6484K363

-CB