SAE J2525 pdf download
SAE J2525 pdf download.SAE Design Guideline: Metal Belt Drive Continuously Variable Ratio (CVT) Automatic Transmissions.
The purpose of this guideline is to povide the essential design considerations for the metal V belt vanator used in continuously vanable transmissions. Information from SAE papers, transmission manufacturers, and component manufacturers is provided to aid engineers ii understanding the function and design methodology of the maor components within the variator system. Recommended design practices are given based on current practices.
2 References
2.1 Applicable Publications—The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest version of SAE Publications shall apply
2,1.1 SAE PuoticA’rloNs—Avaalabie from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001
L. R Oliver, K G. 1-lornung, J E. Swenson and H. N. Shapiro. Design Equations for a Speed arid Torque Controlled Variable Ratio V-Belt Transmission,” SAE Paper 730003, 1973
C. Chan, T. Volz. D. Breitweiser, A. Frank. F. S. Jamzadeh and T. Omitsu, “System Design and Control Considerations of Automotive Continuously Variable Transmissions,” SAE Paper 840048, 1984
V. Saliai, “The ‘ECVT Electro Continuously Variable TransmIssIon,’ SAE Paper 880481, 1988
W. Sesdel, J. Petersmann. Ii. Hlckmann and W. Mollers, Adaptive Control System for Continuously Variable Transmission (CVT). SAE Paper 925062. 1992
K Abo, M Kobayashi and M. Kurosawa, “Development of a Metal Belt-Drive CVT lnoorporating a Torque Converter for Use with 2-liter Class Engines,” SAE Paper 980823, 1998
2,1 2 ASTM PueucA1oNs—Avaitable from ASTM. 100 Barr Harbor Dflve, West Conshohocken, PA 19428-2959.
ASTM D 130—Test Method for Detection of Copper Corrosion from Petroleum Products by the Copper Strip Tarnish Test
ASTM D 445—Test Method for Kinematic Viscosity of Transparent and Opaque Uquids (the Calculation of Dynamic Viscosity)
ASTM D 665—Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water
ASTM D 892—Test Method (or Foaming Characteristics of Lubricating Oils
ASTU D 1 748—Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet
ASTM D 2882—Test Method for Indicating the Wear Characteristics of Petroleum and Non-Petroleum Hydraulic Fluids in a Constant Volume Vane Pump
ASTM C) 2983—Test Method for Low-Tempertaure Viscosity of Automotive Fluid Lubricants measured by Brookfieid Viscometer
ASTM 0 3233—Test Methods (or Measurement of Extreme Pressure Properties of Fluid Lubricants (Falex Pin and Vee Block Methods)
ASTM D 3945—Test Methods for Shear Stability of Polymer-Containing Fluids Using a Diesel Infector Nozzle
ASTM D 4172—Test Method for Wear Preventive Characteristics of Lubricating Fluid (Four-BaN Method)
ASTM D 4683—Test Method forMeasuring Viscos4y at High Shear rate arid High Temperature by Tapered Bearing Simulator
ASTM D 6082—Test Method for High Temperature Foaming Characteristics of Lubricating Oils
2.1,3 CEC PuBLScATI0Ns—Available from the Coordinating European Council. Madou Plaza – 25th Fleor. Place Madou 1. 8-1030 Brussels, Belgium.
CEC L45.T.93
CEC L-48-A
CEC L-070-A85
3. Definitions—The Nomenclature in parentheses and italics is the Alternate Nomandature
3.1 Varlator Belt—A flexible, endless member that transmits torque between two shafts through frictional contact with conical sheaves,
3.2 Varlator Ratio (CVT Ratio, Sheave Ratio, Pulley Ratio, Bait RatIo)—Speed Ratio: pnmary sheave speedi secondary sheave speed
3.3 Vartator Ratio Range (Overall Ratio. Ratio Coverage)—tJnderdrive ratio/overdrive ratio
3.4 Underdrlv. Ratio (Low RatIo)—Highest (numerical) vaitalor ratio. Typically equivalent to low (first) gear in an A/T orMrr
3.5 OverdrIve Ratio (High Ratio)—Lowest (numerical) vanator ratio. Typically equivalent to the highest gear in an NT or M/T
3.6 Primary Sheave (PulIey Set (Input Sheave/Shaft Pulley, Sheave S.t)—Sheave set that is coupled to the engine and represents the Input to the CVT vanator unit (May have gearing between engine and pnmary sheave. I
3.7 Secondary Sheave (Pulley) Set (Output Sheave/Shaft Pulley, Sheave Set)—Sheave set that is coupled to the wheels and represents the output of the CVT variator unit, (Typically has gearing between the secondary sheave and the wheels.)
3.8 Vartator Belt Width (Nemlrial)—The width of the belt at an effective pitch line, Belt width and length combine to define the operating geometry.
3.9 Belt Length—The length of the belt at the effective pitch line. Belt width and length combine to define the operating geometry.
3.10 Wrap Angle—The angie on the sheave through which the belt contacts the sheaves, Can be divided Into active and inactive angles.
3.11 Active Wrap Angle (Arc)—That portion 01 the wrap angle where the belt tensIon is inaeasa’ig (or decreasing).
3.12 Passive Wrap Angie (Arc) (Inactive Wrap Angle)—That portion of the wrap angle where the bell tension is constant.
3.13 Shaft Diameter—The diameter of the primary or secondary shafts underneath the belt.
