M1429
Sheet 1 of 8 Issue 01
February 2004
INTRODUCTION
Layrub couplings have been used in the power transmission industry for over 60 years.
Industrial uses are wide and varied. They included Railways, Trams, Buses, Marine Propulsion,
Auxiliary Drives, Earth Moving Equipment, Aero Industry, Steel Works, Oil Refineries, Mining,
Automotive, Offshore Exploration, Engine Testing, Cooling Towers, Power Generation and
Cement Works.
They provide a connection between a driving and driven machine, which absorbs shock loads,
reduces noise, operates in hostile environments, can accept high levels of misalignment and is
very cost effective.
For engine drive applications they provide damping and are particularly suitable for the control
of torsional vibration.
LAYRUB PRINCIPLE (THE LAYRUB BLOCK)
The bore of the resilient block is reinforced by a high tensile steel wire screen formed from wire
cloth wound tightly round a mandrel and secured by cold soldering. The screen is located in the
mould and vulcanised under pressure causing the rubber to penetrate the wire screen and form a
secure bond. The canvas bonded to the outside diameter of the resilient block is to preserve
dimensional stability only.
The composition of the rubber is of special mix having low heat build up characteristics to cater
with the rapid deformations encountered in service.
For attachment to suitable driving flanges, steel sleeves are pressed into the screen of the resilient
block. The sleeves are shouldered, with spigots to suit mating counterbores in the flange, and the
whole being finally clamped by a bolt and nut.
