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3rd International Pacific Conference on Automotive Engineering (1985)
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U.S. Truck Driver Anthropometric and Truck Work Space Data Survey: Sample Selection and Methodology

Essex Corp.-Mark S. Sanders, Brian E. Shaw
Published 1985-12-01 by SAE International in United States
This paper presents the sample selection rationale and data collection methodology used to collect truck driver anthropometric and work space data. A total of 241 drivers were measured (183 males and 58 females). Data were collected in eight cities nationwide, based on estimates of the number of drivers in each geographic region. A mobile laboratory was used to measure, among other things, body dimensions, arm reach envelopes, foot reach, seat position, eye position, knee position, and stomach-to-wheel clearance. Three buck configurations were used which varied the number of parameters adjusted by the subjects, including seat fore-aft, seat height, steering wheel angle, steering wheel fore-aft, and steering wheel vertical positions. Front and side photographs were made of each subject in his or her preferred seating configuration.
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Air Isolation of Class 8 Highway Tractor Cabs

Mack Trucks, Inc.-Richard B. Gibson, Donald R. Schumaker, Richard B. Walck
Published 1985-12-01 by SAE International in United States
A foundation of highway truck ride and cab suspension historical evolution is laid describing the influence of marketplace demands, highway conditions, and government laws. Ride quality test methods are revealed along with variables tried and conclusions drawn. These data and techniques are then used to design cab suspension systems for a new line of truck products including both conventional and COE cabs.
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Feasibility Study of a System Safety Monitor for Hazardous Material Trucking

Arthur D. Little, inc. Cambridge, MA-Gerald R. Larocque, Paul A. Croce
U.S. Department of Energy, Division of Environmental Control Technology, Germantown, MD-John Cece
Published 1985-12-01 by SAE International in United States
This paper summarizes the results of a study to examine the feasibility of a system safety monitor (SSM) for application to the trucking of hazardous materials. The concept is to provide a continuous record of truck and safety system operation and to detect the onset of certain critical situations. Although originally developed with respect to liquified natural gas trucking, the basic technology, with suitable modification, is applicable to trucks carrying other types of cargo. In developing the SSM concept, five critical accident scenarios were established following a statistical analysis of accident data and a series of interviews. To minimize the required measurements and instrumentation, a theoretical analysis of truck dynamics was performed to develop a set of directly measurable quantities which are sufficient to indicate the occurrence of the selected scenarios. To further demonstrate the feasibility of the SSM, a preliminary instrumentation and support electronics design was developed.
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“SHIFT-MATE” A Fuel Efficiency Monitor

Eaton Corporation Transmission Division-Mark D. Boardman
Published 1985-12-01 by SAE International in United States
The SHIFT-MATE is a dashboard mounted computer based device that cues a truck driver to shift more efficiently. Through electronic circuitry, key vehicle parameters are monitored, computed, then via graphic display, instructs the driver when to shift for improved fuel economy. The theory of operation is described in the text.
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A Review of Present information on Piston Ring Tribology

Fuels and Lubricants Dept. Ford Motor Co. Dearborn, MI-L. L. Ting
Published 1985-12-01 by SAE International in United States
A selected number of papers published within the last five years relating to piston ring tribology research in the areas of friction determination, friction reduction, lubrication, and oil consumption, have been reviewed. Improved ring lubrication models and friction measurement techniques have been developed by various authors. Their efforts have enlarged considerably on our understanding of the main features of ring-cylinder interface friction and lubrication behavior, and the mechanism of engine oil consumption. However, there is still a lack of understanding in matters of quantity and detail. Recommendations for future work are presented.
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A Unitized Heavy Duty Axle Oil Seal

CR Industries Elgin, IL-Glenn W. Peisker
Published 1985-12-01 by SAE International in United States
A new unitized heavy duty axle oil seal (Figure 1) has been developed that meets in whole objectives that are demanded by the modern truck owner. These objectives are, unitized assembly, simplified no tool installation, damage resistance, external contaminant exclusion, use in aluminum hubs and a proven reliability and ultimate life capability. This paper discusses the advanced design which is supported by extensive laboratory and field testing in excess of one hundred million vehicle miles.Typical laboratory testing included intensive functional life bench testing, comparative dust testing and cold follow-ability and fracture tests. The field testing has made use of a broad array of vehicle applications from continuous duty coast-to-coast transport in Canada to short haul quarry pit and numerous city traffic fleets.The results of the laboratory and field testing are discussed, revealing how this design has met the demands of the modern seal user.
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Chalmers Series 1200 Air/Rubber Truck Tandem

Chalmers Suspensions International, Ltd.-Wallace G. Chalmers
Published 1985-12-01 by SAE International in United States
The engineering objective was to design and develop a 40,000-lb. capacity tandem axle truck suspension mounted on air springs. It was to be developed from the existing Chalmers Series 800 rubber spring tandem suspension and was to provide a softer ride under all load conditions (Fig. 1). At the same time, the suspension was to be self-damping under any load condition without having to resort to shock absorbers.
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The Importance and Evolution of the Standardized Serial Data Link to the Truck OEM

International Harvester Co. Truck Group Engineering-Donald E. Riley, Robert J. Onesti
Published 1985-12-01 by SAE International in United States
The heavy duty truck industry is experiencing an electronic evolution in an effort to respond to demands for greater fuel efficiency, reliability, and stricter emission regulations. With the advent of electronic products for use in engine, transmission, and brake controls, it has become apparent that some sort of interface standard is necessary to allow communication between the various modules. Fortunately such a standard already exists, in part; SAE J1708 - Recommended Practice for Serial Data Communication Between Microcomputer Systems in Heavy Duty Vehicle Applications. This paper will attempt to explain this new standard and how it may affect powertrain electronics.
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Radial Shaft Seal with PTFE Sealing Lip

Carl Freudenberg-W. Schmidt
Published 1985-12-01 by SAE International in United States
This paper discusses the engineering aspects for the application of PTFE or elastomeric radial shaft seals in the automotive industry. Primarily considered are frequently used materials compared to PTFE, the sealing lip contact of the seal on the shaft, the frictional torque as well as important functional operation differences between elastomeric and PTFE radial shaft seals.Finally, a description of various design versions are given to portray the actual PTFE radial shaft seal program.
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Method of Graphically Determining Path of Trailer Off-Tracking in Turns

IRI International-Don L. Carter
Published 1985-12-01 by SAE International in United States
A graphical method to -determine magnitude of trailer off-tracking for any given path of travel.
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