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).
Engineering data for allowable wear load and stress values for spiral bevel and hypoid gears.
| Identifier | ExFiles\Box 114\1\ scan0074 | |
| Date | 23th April 1936 | |
| GEAR ENGINEERING DATA Maximum allowable wear load and stress values for Spiral Bevel and Hypoid Gears in Automotive Drives. 1. Wear load (#/1" Face) Low Gear Direct Drive Tractive Effort Passenger Cars 4200#/1" Face 1600#/1" Face 3600#/1" Face Busses and Trucks 6000#/1" Face 1600#/1" Face Tractors 2500#/1" Face 1400#/1" Face 2. Maximum allowable stress values (#/sq.in.) based on low gear torque. SAE2315 = 85,000#/sq.in. SAE4615 = 85,000#/sq.in. SAE2512 = 100,000#/sq.in. SAE3312X = 120,000#/sq.in. Stress values given above assume the use of the Lewis formula with the Y outline factor obtained from the reprint on "Gleason Works System of Bevel Gears" or from a layout in which the teeth are rolled out in the linear plane. Formulas: Wear Load based on Motor Torque (#/1" Face) = (Max. Motor Torque ("#) x Low Gear Trans.Ratio x 2 xDP) / (Number of teeth in pinion x Face) Wear load based on tractive effort (#/1" Face) = (Weight on axle x Friction coeff. x tire rolling radius) / (Ring Gear Radius x Face) Friction Coefficient = .65 Static Stress (#/sq.in.) = (Total wear load x DP x Cone Distance) / ((Cone Distance - Face) x Face x Y) March 22, 1932 April 23, 1936 GLEASON WORKS | ||