Lovejoy D-8B 1/2″ UJNT friction bearing universal joint replacement – The TSC500 1/2″.
TSC500 1/2″ universal joint alternative for mechanical power transmission couplings.
Replace your Lovejoy D-8B with a maintenance free, flexible shaft coupling alternative.
Couplings in the industrial sector traditionally are broken into two sectors, the elastomeric couplings that can only run at angles of 1° or less otherwise they wear out, as they cannot physically flex beyond that, normally they run at 2°.
The Lovejoy NB-8B is a block and pin universal joint which belongs to the other group.
Lovejoy D-8B Universal Joint.
The Lovejoy D-8B is a friction bearing or block and pin universal joint and can only run at 1750 RPM maximum to reduce wear and creation of heat that can lead to the block seizing, this is why it must stay lubricated at all times. The friction of the pin inside the block leads to play and therefore vibration
The other are universal joints which can normally only run at 8° otherwise prematurely wearing the bearings within the propeller shaft of the universal joint, the bearing will become loose and that creates vibration and with continual wear the ball bearings will fail.
Twin Spring Coupling can run up to 25° without needing to be lubrication, and at low angles of misalignment and comparable high speeds to traditional industrial couplings.
Ball bearings being very precise instruments also need to be contained to ensure infiltration by any foreign contaminants, as things like water, mud, dust or dirt will again cause the ball bearings to seize in their tracks and this means bearing failure.
Being used at high speed for long periods of time produces heat and that can cause the ball bearings to seize inside the bearings leading to premature failure.
The other downside to a universal joint are the yokes which the bearings are contained in, the coupling piece of the yokes are quite tough but the section that contains the bearings not so much as they have to hold the bearings.
This is a weak point as the bearings are usually less than 2″ across so the machining to contain the bearings is alot smaller than the rest of the yoke, which means the likely of them cracking is that much higher.
Cracking leads to catastrophic failure and replacement of both the yoke and universal joint is assured. This makes it an expensive repair as with the price of the yoke and universal joint, it is usually cheaper just to replace everything, both yokes and the propeller joint.
Twin Spring Coupling is different it replaces the entire U joint, yokes, propeller/cross bearings everything, with a simple one piece design.
By being a one piece design also means Twin Spring Coupling wont break like the yokes do in traditional Lovejoy D-8B joints.
Our coupling is available in all the standard industry splines for easy replacement or retrofit for OEM.
Ruland – UJ-HD1250, UJ-HS1125, JC jaw, MJC jaw couplings.
Guardian Couplings – Curved jaw 28/38 Green, 38/45 Red, 42/55 White, 48/60 White , Guardex M-80, Spec I-65, LJW L150-LJW L225.
TB Woods – Dura Flex WE 40, L150, AL150, SS150, L190, L225, L276, G Flex grid coupling 1000T10 – 1000T20- 1050 & 1060.
Lovejoy – L110, L150, L190, D-7, D-8, NB-8, NB-10, DD-7, LOJ-10, C226 C276 (SOX), CJ 55/70 – 65/75 (92A) 42/55 – 48/60, 55/70 (98/95A), 42/55 – 48/60 (64D), Uniflex U-150R, Saga S18, S Flex 8-12, Delta Flex 50HT/60.
Curtis – CJ648B.
KTR – Rotex AL-H 38/42/48 (42-92A) 48-92A, GJL 42/48/55/65 (48 92-98/55 92-98) (65 -92A).
SKF – FRC230, SKF Flex 140, UJMA40.
Boston Gear – FC45 XFCA Poly, J200, UJAS 16-16, UJNL 24-24.
Rexnord – Omega Orange 30-40, Omega HDY 30, Viva 190 – 215, Falk Wrapflex 30R.
SIT – GU5P, GU5E, GU5H, Trasco ES 75 red and green.
Martin – Quadra Flex Size 11 Thermo Plastic Rubber (TPR), Size 8 Hytrel, MS150 Hytrel., ML190 Hytrel.
For more information on the TSC500 go to https://twinspringcoupling.com/coupling-products/tsc-500/.