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).
Description of the general properties of the Humfrey-Sandberg free wheel clutch.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 86 | |
| Date | 11th November 1927 guessed | |
| CONFIDENTIAL. MESSRS. SANDBERG Consulting & Inspecting Engineers. Offices: 40, Grosvenor Gardens, LONDON. S.W. 1. HUMFREY-SANDBERG FREE WHEEL CLUTCH GENERAL PROPERTIES 1. The clutch consists of two concentric conoidal members between which lie cylindrical rollers whose axes are skewed to the axis of the shaft. The surfaces are so formed that the rollers make full line contact on each member when in their skewed position. 2. The two members are normally kept in contact with the rollers by means of light spring pressure acting axially. Under such conditions engagement takes place automatically in one direction of rotation and disengagement takes place automatically in the opposite direction by means of a small axial movement of one member towards or away from the other. This is the normal "free wheel" action. 3. If the axial movement of engagement is controlled by means of a positive adjustable stop, then:- (a) engagement can be definitely prevented in either direction of rotation, (b) the movement of engagement can be controlled so that the clutch will slip at any desired torque, and (c) a gradual slipping engagement can be made. 4. The clutch operates with constant oil lubrication, viz., either immersed in an oil bath or with a constant circulation of oil passing through it. When either slipping or "free wheeling" the rollers are continuously revolving so that lubrication of the slipping surfaces can be made very efficient. 5. The contact areas on both rollers and clutch surfaces are never the same at successive engagements. Consequently (a) wear is uniformly distributed over the whole available | ||