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).
Technical report discussing the performance of a spring clip and suggesting design modifications.
| Identifier | ExFiles\Box 80\2\ scan0138 | |
| Date | 1st April 1920 | |
| (2). DA{Bernard Day - Chassis Design}3/CB30-4-20 contd. springs do not squeak, and they, as a matter of fact, givenvery good service on 7CA. With reference to the clip, the present one is a steel casting. On the bumping rig the first thing to go is the stud which holds the clip to the plate. The next thing is the bolt holding the two jaws and the clip together. The clip itself rarely ever breaks. We make out that there is a moment tending to turn the whole clip round which puts tension on the stud. Also the fact that the plates twist when one wheel goes up causes a certain amount of tension in this bolt, in addition to which, if the clip is not a good fit sideways this bolt may be called upon to take the whole of the sideways load in shear and bending. In other particulars there is tension in the long bolt holding the two jaws and the clip, there is tension in the top bar of the slip, and a certain amount of bending at the corners, but not much of this latter. We suggest the following clips:- (1). This is due to Mr Woodhead, who says that he would like to do it provided it is only done on one plate. It consists in forging the two jaws on the end of the second plate and turning them down to grip the bottom plate. This ensures that the side load is taken by two plates in as good a manner as possible. If this is done we think the second clip might be a very light one, and possibly held as now except that we replace the stud by a bolt. (2). The next suggestion which Mr Woodhead likes is a clip similar in type to the present one, but held down by Contd. [Upside down text at bottom] R R 235 (100) T S L 68 819 G(8-19) 618 916 C 2460 | ||