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).
Pedal recommendations for a Borg & Beck Clutch for the 20/25 HP application.
| Identifier | ExFiles\Box 129\2\ scan0163 | |
| Date | 19th December 1935 | |
| IMO Borg & Beck Clutch PEDAL RECOMMENDATIONS To: - MESSRS. ROLLS-ROYCE Application 20/25 HP Date 19th December 1935 Diagram Labels: RELEASE BEARING ASSEMBLY OPERATING LEVER CONNECTED WITH THROWOUT FORKS PEDAL FREE ON SHAFT PULL OFF SPRING PEDAL MOVEMENTS. Movement from 1 to 2 is idle movement of the clutch pedal and is necessary to ensure a minimum clearance of 1/8" (which must be maintained) between the release lever plate and the release bearing (R). A spring should be used to retain the foot pedal lightly against a stop and to avoid the weight of the pedal riding on the release bearing and also to maintain the clearance mentioned. The amount of pedal pad movement from 1 to 2 will depend on the pedal ratio recommended (see our recommendations). Movement of pedal from 2 to 3 will ensure full and satisfactory release of clutch, and this movement will depend on the pedal ratio provided (see recommendations) STOPS. To maintain the clutch pedal position it is necessary to provide stops. Stop “A” is desirable to assist initial setting of pedal on assembly, and is a suggested method only. Stop “B” is a suggested Method of limiting the travel of foot pedal and to prevent unnecessary damage to the clutch mechanism or release bearing. This stop can be of an adjustable character if desired. ADJUSTMENT. “C” is necessary to maintain the proper working position between the clutch and the foot pedal and also to take care of reduction in clearance (R) due to clutch facing wear. RECOMMENDATIONS max. min. R/R.{Sir Henry Royce} Pedal ratio ... ... ... 10/1 8/1 8.85 Pressure required at pedal pad ... lbs. 37.5 30 33.7 Pedal pad movement : From position 1 to 2 1" 1" 1" Pedal pad movement : From position 2 to 3 4-3/8" 3-1/2" 3.86 Total movement 5-3/8" 4-1/2" 4.86 These recommendations for clutch actuation are based on Borg & Beck Clutch Model 11 A3 as per our drawing No. 30600 to transmit a maximum torque of 200 pounds feet at 1,750 r.p.m. CWH SOLE MANUFACTURERS FOR THE BRITISH EMPIRE, EXCEPTING CANADA BORG & BECK COMPANY, LTD. DIRECTORS: E.{Mr Elliott - Chief Engineer} B. BOUGHTON W. EMMOTT. D.{John DeLooze - Company Secretary} T. BROCK Brock House, Langham Street LONDON, W.1 WORKS LEAMINGTON SPA | ||