AT THE HEART OF THE ROAD TRANSPORT INDUSTRY.

Call our Sales Team on 0208 912 2120

increased Range of

24th February 1950
Page 61
Page 61, 24th February 1950 — increased Range of
Close
Noticed an error?
If you've noticed an error in this article please click here to report it so we can fix it.

Which of the following most accurately describes the problem?

Rotofig Dampers

WITH the introduction of additional VI' models in the 'range of Rotoflo dampers manufactured by Universal Dampers, Ltd., Cranrnore Boulevard, Shirley, Birmingham, all types of commercial vehicle up io 2 tons per wheel may be fitted with replacement or original-equipment units.

There are two distinct types of Rotoflo shock absorber, both of which function on the same principle and use uncured synthetic rubber as the resistant medium. Each type is comprised essentially of a rotor linked to the operating lever, and an outer fixed casing into which the rubber is introduced under pressure. Both bound and rebound spring movements stress the rubber in shear, and at the same time a controlled mangling" action is initiated, which increases the effective resistance to motion as the rate of application arises.

Smooth-bore Casing

In the A-type Rotoflo the casing has a smooth bore, and the absorbent pmperties of the damper mainly depend upon the resistance of the rubber lodged between the casing and the close-fitting hollow rotor, round the periphery of which a number of holes is drilled. Inside the rotcir a tongue which projects from the outer end of the casing provides additional shear area, and, by churning the rubber at the holes, increases the density of the medium at the working face.

The A models are particularly sensitive to the .positioning of the adjusting screw, which is located in the end of the hollow spindle and by which the internal pressure may be varied. In certain instances this feature is of considerable value, as it enables a single size to be used for many different lever arrangements and loading duties.

The 0-type has a solid rotor, which, is either knurled or grooved, and a casing wilh internal ribs. A second hearing takes the place of the end tongue, and a diametral passage in the rotor communicates with the centre of the spindle. The working clearance is greater, but the ribs increase the churning action, and 'the rubber between them is residual in that it is not functional in the most active sense.

This damper is not, therefore, senS.iLive to adjustment, as the amount of rubber in the cavities over a minimum requirement does not materially affect the resistance created. The largest 0-type damper has been made non

adjustable for this reason. .

In both types the rubber penetrates to the bearing area and forms a thin layer of bearing material. A fibre sealing washer, which is keyed into position by serrations, prevents any loss of the plastic, By repetitive testing on a machine for some hours after the introduction of a small pigmented portion of rubber, it was proved that the material is continually subdivided and "circulated."After 16 hours at a high rate of oscillation the pigment had spread evenly through the material, and this shows that all the rubber is eventually used at the working faces, and explains the long life of the units before refitting becomes necessary.

The largesk damper is the A.4, designed for a loading of 2 tons per wheel. The largest G unit, the 0.3, has a capacity of 1 tort per wheel. The smallest dampers, the A.I and the 0.1, each have a capacity of 5 cwt. per wheel.

Tags

Locations: Birmingham

comments powered by Disqus