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).
The mechanics of a clutch operating as a slipping drive, covering torque, friction, and axial thrust.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 105 | |
| Date | 18th July 1927 guessed | |
| - 7 - the opposite sense, the axial thrusts tending to separate the outer from the inner member, with the result that unclutching takes place and the driven shaft "free-wheels". This unclutching may be limited by either a fixed or an elastic stop, as desired. 5. Action of the clutch as a slipping drive. If the outer member is prevented from being pushed home by means of a fixed stop, the state of things described in { 2, 3 as holding between first grip and final lock, instead of being transitory, remains permanent, a torque being applied by the outer to the inner member. Moreover this torque, being due to viscous slipping increases with the speed of relative motion and so may be brought up to any required value. On the other hand, if the grip be sufficiently tight, static friction will play a part at first, provided the torque does not exceed a certain amount. Thus, up to a certain limiting torque, the clutch acts as such, even when not quite home, the driving and driven shafts revolving together. If, however, the torque is sufficiently great to overcome static friction, slipping occurs and thereafter, if lubrication is provided, we have to deal with fluid friction: there will then at first be a considerable reduction of the torque, but eventually it may rise much above the value at which slipping first occurred. If the sense of relative motion be reversed, as in { 4, a torque will be exerted tending to check relative motion and a corresponding axial thrust will be brought into play tending to separate the two members. If this axial thrust be unresisted the members will separate so far that the torque and thrust will fall practically | ||