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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).
Four schemes for the Junior gearbox and its column control.

Identifier  ExFiles\Box 136\2\  scan0281
Date  17th July 1940
  
To Rm.{William Robotham - Chief Engineer}
e.{Mr Elliott - Chief Engineer} to Rm{William Robotham - Chief Engineer}/HH.

Ev.{Ivan Evernden - coachwork}1/JH.17.7.40.

Junior Gearbox.

The following 4 schemes cover the Junior gearbox and its column control.

PL.232. Junior Gearbox.

This is modelled on the Senior Rationalised gearbox, but is considerably shortened by having 3rd. and 4th. synchromesh similar to PL.55 and by not having a centre bearing. Also the 1st motion shaft bearing is housed directly in the gearbox casting which further shortens and simplifies the box. The box is proportioned for a maximum engine size of 2 litres using only nickel steels. For the 2.8 litre Rippletto the layshaft will have to be in S/ZNCR.

For Myth we show a gearbox extension with a sliding joint on the main shaft. This is for use with a single non-telescopic prop shaft.

For Rippletto we show a short rear end for use with a divided prop.shaft. We have projected a servo drive for Rippletto, but we do not expect to use it.

PL.233 Control Linkage.

This linkage will not eliminate pumping of the hand lever, but it is arranged that columnlevers move in unison so that cross gate movement is not impeded. The pin joints use a Torflex bush, of which we have 1 sample. This is not a Harris bush, but has a bronze inner sleeve which rotates on its pin. The rubber in the bush permits misalignment and insulates noise. We think the reverse control rod will have to be slightly bent to clear the other two rods.

PL.234 Gear Lever Selector Box.on Column.

This is based on Studebaker with selection taking place at the root of the column. We have put the parts in an oil filled box to reduce rattles and friction. For the same reason we have mounted the hand lever on Harris bushes.

In order to finish off the top of the control tube neatly we have used an unusual construction, i.e. fabrication by flash butt welding.

Cont'd.{John DeLooze - Company Secretary}
  
  


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