From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Page discussing various applications of bonded rubber for vibration damping and illustrating a shearing test.
Identifier | ExFiles\Box 133\4\ scan0304 | |
Date | 1st January 1937 guessed | |
2 between the driving and driven members, it removes chatter and ensures a more progressive engagement. A very interesting development which has, however, hardly yet emerged from the testing stage by certain railway companies, is a resilient wheel of the disc type, which should prove very effective in preventing shock and reducing noise in railway vehicles, these objectionable effects being now generally transmitted from the rail to the body of the vehicle. In this application the hub portion of the wheel may be said to be extended into three parallel discs between which are two discs projecting from the rim portion, the spaces between and round the peripheries of the discs being filled with bonded rubber. is attached, the whole of its mass is involved. With any less complete bond, say, by attaching the rubber by screws, the greater part of the rubber is inert and movement is absorbed by the remaining small part only, at one part of the vibration cycle at all events. An attachment for preventing vibration to or from a shaft having an oscillating lever was illustrated by a connection between the front forks and the main frame of a motor bicycle, the arrangement displacing the ordinary device of a helical spring. The lever was formed with an elliptical hole inside which was a smaller elliptical collar for attachment to the shaft by splines, &c., the collar and lever being bonded together. The whole was sufficiently flexible to absorb the vibrations FIG. 4. 6565D ENGINEERING FIG. 5. 6565E ENGINEERING FIG. 6. 6565F ENGINEERING FIGS. 4 TO 6. STAGES OF SHEARING TEST. In addition, there were to be seen a number of other applications, a notable one being designed to replace the usual helical spring for damping vibration. This application consists of a thick cylinder of rubber, with a pair of diametrically opposite flats bonded with metal plates externally. These plates form the points of attachment to the car body or other part it is desired to isolate from vibration, and the portion from which the vibration is derived. The cylinder walls collapse or extend in a diametral direction as necessary, and absorb relative movement. In this application one of the cardinal advantages of the method is particularly apparent. This advantage is, that the rubber being virtually an elastic portion of the part to which it from the front wheel, and, should the rubber fail by rupture, the elliptical collar could not twist completely round in the hole in the lever boss. Numerous other applications for mounting engines, &c., for aeroplanes, or on stationary foundations, were shown, as well as smaller examples of such applications as mountings for instruments which require to be protected from shock or vibration. The Metalastik process is also used in making an effective and durable form of resilient cushion by the used of folded wire mesh the interstices of which are filled with bonded rubber. The research department of Messrs. Metalastik appears to be well equipped for investigating any problem of damping out unnecessary and objectionable movement. PRINTED BY HARRISON AND SONS, LTD., LONDON | ||