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Hydrodynamic Drives Terminology

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J641_201912
  • Current
Published 2019-12-02 by SAE International in United States

Since the torque converter and fluid coupling are commonly used components of automatic transmissions in industry, the SAE appointed a committee to standardize terminology, test procedure, data recording, design symbols, and so forth, in this field. The following committee recommendations will facilitate a clear understanding for engineering discussions, comparisons, and the preparation of technical papers.

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Automatic Transmissions - Schematic Diagrams

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J647_201911
  • Current
Published 2019-11-19 by SAE International in United States

The following schematic diagrams reflect various methods of illustrating automotive transmission arrangements. These have been developed to facilitate a clear understanding of the functional interrelations of the gearing, clutches, hydrodynamic drive unit, and other transmission components.

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Rectangular Cross Section Polymeric Sealing Rings

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J2310_201910
  • Current
Published 2019-10-09 by SAE International in United States
The purpose of this SAE Recommended Practice is to establish guidelines for the automatic transmission and hydraulic systems engineer to design rectangular cross section seals for rotating and static grooved shaft applications. Also included are property comparisons of polymeric materials suitable for these applications. Historically, material covered in this document is not intended to include aluminum contact applications.
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One-Way Clutches - Nomenclature and Terminology

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J1087_201907
  • Current
Published 2019-07-24 by SAE International in United States
The definitions and illustrations in this SAE Recommended Practice are intended to establish common nomenclature and terminology for automotive transmission one-way clutches.
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SAE No. 2 Friction Test Machine 6000 rpm Stepped Power Test

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J2488_201907
  • Current
Published 2019-07-24 by SAE International in United States
This SAE Recommended Practice is intended as the definition of a standard test, but may be subject to frequent change to keep pace with experience and technical advances. This should be kept in mind when considering its use. The SAE No. 2 Friction Test Machine is used to evaluate the friction characteristics of automatic transmission plate clutches with automotive transmission fluids. It can also be used to conduct durability tests on wet friction systems. The specific purpose of this document is to define a 6000 rpm stepped power test for the evaluation of wet friction system performance variation as a function of power level. This procedure uses an initial engagement speed of 6000 rpm and is intended as a standard procedure for common use by both suppliers and end users. The only variables selected by the supplier or user of the friction system are: a Friction material b Fluid c Reaction plates These three variables must be clearly identified when reporting the results of using this test. If any of the test parameters or system…
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SAE No. 2 Friction Test Machine μPVT Test

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J2490_201905
  • Current
Published 2019-05-31 by SAE International in United States
This SAE Recommended Practice is intended as the definition of a standard test, which may be subject to frequent change to keep pace with experience and technical advances. This should be kept in mind when considering its use. The SAE No. 2 Friction Test Machine is used to evaluate the friction characteristics of automatic transmission plate clutches with automotive transmission fluids. It can also be used to conduct durability tests on wet friction systems. The specific purpose of this document is to define a μPVT Test for the evaluation of the variation of wet friction system performance as a function of speed, temperature, and pressure. This procedure is intended as a standard for both suppliers and end users. The only variables selected by the supplier or user of the friction system are: a Friction material b Fluid c Reaction plates These three variables must be clearly identified when reporting the results of this test. If any of the test parameters or system hardware as described in this document are changed, other than the friction material,…
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SAE No. 2 Friction Test Machine 3600 rpm Stepped Power Test

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J2487_201905
  • Current
Published 2019-05-23 by SAE International in United States
This SAE Recommended Practice is intended as the definition of a standard test, but may be subject to frequent change to keep pace with experience and technical advances. This should be kept in mind when considering its use. The SAE No. 2 Friction Test Machine is used to evaluate the friction characteristics of automatic transmission plate clutches with automotive transmission fluids. It can also be used to conduct durability tests on wet friction systems. The specific purpose of this document is to define a 3600 rpm Stepped Power Test for the evaluation of wet friction system performance variation as a function of power level. This procedure uses an initial engagement speed of 3600 rpm and is intended as a standard procedure for common use by both suppliers and end users. The only variables selected by the supplier or user of the friction system are: a Friction Material b Fluid c Reaction Plates These three variables must be clearly identified when reporting the results of using this test. If any of the test parameters or system…
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Hydrodynamic Drive Test Code

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J643_201812
  • Current
Published 2018-12-05 by SAE International in United States
The range of test conditions on the dynamometer shall be sufficient to determine the primary operating characteristics corresponding to the full range of vehicle operations. The characteristics to be determined are: a Torque ratio versus speed ratio and output speed b Input speed versus speed ratio and output speed c Efficiency versus speed ratio and output speed d Capacity factor versus speed ratio and output speed e Input torque versus input speed NOTE: For more information about these characteristics and the design of hydrodynamic drives, refer to “Design Practices: Passenger Car Automatic Transmissions,” SAE Advances in Engineering, AE-18 (Third Ed.) or AE-29 (Fourth Ed.).
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Planetary Gears - Terminology

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J646_201807
  • Current
Published 2018-07-12 by SAE International in United States
Figures 1 through 5 illustrate in simplified form some of the more common planetary gear arrangements in order to establish applicable terminology. Figures 6 and 7 provide additional examples that use elements of those gear arrangements. Gear ratio is the numerical ratio of input to output speed.
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Automatic Transmission Functions—Terminology

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J649_201803
  • Current
Published 2018-03-23 by SAE International in United States
The following is a list of the most common terminology used in describing automatic transmission functions.
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