SAE TECHNICAL PAPER SERIES 970689 ZF 5-Speed Transmissions for Passenger Cars Heribert Scherer and Georg Gierer ZF Getriebe GmbH Reprinted from: 1997 Transmission and Driveline Systems Symposium: Transmission Systems, Components, Gears and Friction and Fluid Materials (SP-1241) International Congress & Exposition Detroit, Michigan February 24-27, 1997 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (412)776-4841 Fax:(412)776-5760 Downloaded from SAE International by University of Edinburgh, Sunday, August 26, 2018The appearance of the ISSN code at the bottorn of this page indicates SAE's consent that copies of the papermay be made for personal or internal use ofspecrficclients. This consent is given on the condition however, thatthecopierpay a$7.00perarticlecopyfeethrough the Copyright Clearance Center, Inc. Operations Center,222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, foradvertisingorpromotional purposes, forcreating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. DirectyourorderstoSAECustomerSalesand Satisfaction Department. Quantity reprint rates can be obtainedfromthe Customer Sales and Satisfaction Depart­ ment To request permission to reprint atechnical paper orpermission to use copyrighted SAE publications in otherworks, contact the SAE Publications Group. No part of this publication may by reproduced in anyform, in an electronic retrieval system or otherwise, without the priorwritten permission of the publisher. ISSN0148-7191 Copyright 1997 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the paper if it is published in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishingto submit papers tobe considered for presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USA Downloaded from SAE International by University of Edinburgh, Sunday, August 26, 2018970689 ZF 5-Speed Transmissions for Passenger Cars Heribert Scherer and Georg Gierer ZF Getriebe GmbH Copyright 1997 Society of Automotive Engineers, Inc. ABSTRACT With the introduction of the 5HP24 in early 1996, ZF has completed their product line for 5-speed transmissions. This transmission was especially developed for 8 cylinder engines and has achieved important improvements in fuel consumption, performance, comfort and reliability. This report shows, that 5-speed automatic transmissions result in a reduced fuel consumption, even in countries with speed limits. For example the 5HP24 incorporates the latest developments such as: • converter wirth controlled slip clutch (CSC) • measures to allow engine speed between 600 and 7200 rpm • modern closed loop control shifting strategy • performance improved Transmission Control Unit (TCU) INTRODUCTION By introducing the first 5-speed automatic transmission 5HP18 in 1990, ZF has started to build up a completely new transmission segment. This program has now been completed with the introduction of the 5HP24 (cross section see appendix) in 1996 and comprises: Whilst the 5HP18 was developed out of an existing 4-speed transmission in 4+1 design, the 5HP24 and 5HP30 are based on a common new design concept with major components of a modular design. After 5 years of experience with the 5HP18, a new updated version was developed, the 5HP19. The new features of this transmission are similar