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).
Copy of a document from The U.S. Axle Company detailing their front wheel brake data.
Identifier | ExFiles\Box 32\2\ Scan055 | |
Date | 16th November 1923 guessed | |
COPY. THE U. S. AXLE COMPANY. FRONT WHEEL BRAKE DATA. Briefly we will cover a few points regarding the action and design as follows:- Brake lever (A) is keyed to push rod (B), and can be located in any position convenient for hook-up to the brake countershaft and pedal by rod or cable. When the foot pedal is depressed, lever (A) moves in the direction shown by the arrow, turns push rod (B), and causes the threaded push rod ends (C) to move outward toward the wheel, thus causing cam (D), which acts up and on the beam to press down, and force the yoke lever (E) downward against the yoke (F) and the toggle (G), which in turn acts directly on the brake shoes. This is just one of many ways in which the yoke lever (E) and toggle yoke (F) can be made to act, but we think this construction gives great simplicity and ruggedness. The brake toggles are of unequal length, and offset from the center of the pivot in such a manner that the shoe which tends to wrap into the drum receives less pressure than the shoe which tends to be forced away from the drum, and prevents chattering. The rotation being as shown by the arrow. The toggle yoke (F) allows freedom of movement of the toggle, thus making the brake shoes self centering. The lower end of the cam (D) floats in the push rod ends in such a manner that any beam deflection does not cause a binding action. The push rod (B) is one piece, and is free to move lengthwise on the beam so that the braking pressure is equalized. In working out the front brake application, we have tried to keep the construction as simple as possible. For instance one bolt (H) holds the brake anchor and the steering arm in position, but there is no direct stressing of this one bolt thru either of these parts. This type of connection enables us also to cover up the brake mechanism in a very neat and compact manner. | ||