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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).
Achieving satisfactory results for a 20 HP Starter Motor with a multiple clutch.

Identifier  ExFiles\Box 5\6\  06-page026
Date  23th November 1927
  
To R.{Sir Henry Royce} from Ha/GWH.{George W. Hancock - Head Chateauroux}
c. to BJ. WOT.
c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design}
c. to BY.{R.W. Bailey - Chief Engineer}

Y5300
Y5650

20 HP. STARTER MOTOR TO LeC.2442. (MULTIPLE CLUTCH).

We have now got this scheme to give very satisfactory results. There is no sign of thumping upon engaging, sufficient initial friction to rotate the unit and engage the pinion from rest, and wind up the buffer spring without slipping. The limited torque comes into action and allows the motor to spin when excessive load is applied such as a frozen motor or a gear inadvertently left in and brakes on.

To obtain these results it is necessary to use cork washers, cushion spring of 12 lbs., buffer or clutch spring of 130 lbs. at .650" deflection giving a slipping torque load of approx. 300 in.lbs.

We found, after our last report, that we were being mislead in our results due to the buffer spring D.{John DeLooze - Company Secretary} 51378 being choc-a-bloc when the operating sleeve D.51582 came choc-a-bloc against the flange on shaft D.51575. To overcome this we reduced the thickness of the cork washers, and to obtain sufficient friction for the total torque load it was found necessary to bring the buffer or clutch spring load up to 130 lbs. at .650" deflection giving us a total torque load of 800 ins.lbs. We find that the torque load given in the LeC.2441 of 500 lbs.ins. allows too much slipping before the drive is taken up. In order to obtain definite figures of the unit we attached a 10" lever to the motor pinion and prevented the armature shaft from revolving.

contd :-
  
  


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