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).
Issue of 'jaggering' clutches and the effect of different engine couplings and oiling.
Identifier | ExFiles\Box 20\3\ Scan044 | |
Date | 7th February 1914 | |
Mr. Johnson. C O P Y. February 7th. 1914. re "Jaggering" Clutches. -------------------- With the cars now on test I notice that there is a general tendency for the clutches to "jagger", i.e. when slipped there is a bad vibration set up in the transmission. The defect only seems to be there on the top drive and when the clutch is not well oiled. It also only seems to have become noticeable since we replaced the damped spring engine coupling with the solid type. I was able to demonstrate to Mr. Haldenby yesterday that with a plain coupling the "jaggering" was bad whereas on the same car, the coupling only being replaced with a damped spring type coupling, the "jaggering" was hardly perceptible. Although not cured, it certainly seemed to have considerable effect in damping it out, i.e. although there was a tendency for it to still "jagger" it never seemed to "build up" or get into a state of continued vibration as was the case with the solid coupling. During the above tests it appeared essential that the spring coupling must be properly damped. Mr Haldenby also demonstrated that if the clutch was well oiled the "jaggering" even with the solid coupling was entirely eliminated. I have not gone into the testing in any great detail, which I think is a matter for the Exp. Dept. I am not trying to condemn any part of the construction of the chassis, nor am I advocating the use of the spring drive coupling. | ||