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Viewing 9631 to 9660 of 10850
1969-02-01
Technical Paper
690790
Paul E. Carlson
The truck flywheel power takeoff has proven itself as a reliable means of supplying continuous power to a variety of mounted equipment. The features of available units are described in detail in an effort to provide the design and application engineer with complete information regarding their function and application, and to stimulate expanded usage of this constant power source.
1969-02-01
Technical Paper
690804
J. E. Ford, J. E. Thompson
Abstract Improving occupant survivability during a rollover accident requires a detailed analysis of the dynamics and statistical significance of a particular rollover situation as well as the structural performance of the vehicle involved. A two-dimensional model describing vehicle rollover has been developed which, in conjunction with a proposed index of performance, allows such an evaluation. Dynamic equations of motion for ground contact and airborne travel are used in the model which is programmed for solution on a digital computer. The model is validated by comparison of a graphics console display of the model trajectory with filmed sequences of a vehicle rollover. Validation of the model establishes the feasibility of this approach for predicting the rollover characteristics of a vehicle and determining relative safety performance between vehicles.
1969-02-01
Technical Paper
690772
G. G. Lewis
Oil well wireline services impose special requirements on truck chassis. Present designs are not adequate in all respects to meet these requirements. New designs are needed, particularly in view of the current trends to drill for oil in more remote areas and under severe climatic conditions.
1969-02-01
Technical Paper
690214
J. L Harned, L. E. Johnston, G. Scharpf
Tire brake force characteristic data are presented that should be helpful in the design of wheel slip control systems. Correlation of these data has been established with antilock system performance. Experimentally measured μ-slip curves are given for a large number of tire/road pairings. These measurements cover a wide range of commercial tire types on dry and wet road surfaces and glare ice. It is shown how wet road characteristics are affected by road construction, water cover depth, and tread wear. The measuring system used to obtain these data is described and variability of the experimental measurements is discussed.
1969-02-01
Technical Paper
690526
J. J. Bajer
Propulsion, decelerating, and steering control of ground vehicles using pneumatic tires depends upon road-tire frictional forces developed within a few square inches of the road-tire contact area. Tire and vehicle designers should, therefore, have knowledge of tire distortions and force development in the contact area, and should understand tire hydrodynamics in order to develop tire-vehicle systems with optimum performance on wet, slippery roads. This paper discusses the following testing techniques: road-tire-vehicle system to evaluate skid resistance, skid trailer versus complete vehicle tests, effects of radial stiffness on skid resistance, etc. Data obtained from these tests make it possible to evaluate road grip of tires as a function of the type of tire, tread design, and tread compound.
1969-02-01
Technical Paper
690001
J. A. Davisson
Basic tire design factors, performance properties, application requirements, and their interrelated effects are discussed to furnish general insight into commercial-vehicle tire engineering: The subject is covered comprehensively to illustrate the numerous considerations and decisions affecting the design and use of commercial-vehicle tires. The information is presented primarily from the perspective of the tire engineer with the objective of providing a fundamental background for the vehicle designer and operator.
1969-02-01
Technical Paper
690096
Edward D. Hendrickson
This history of tandem suspensions outlines the problems encountered by early four wheel solid tire trucks. It covers the evolution to pneumatic tires and then the addition of the third axle. It illustrates the many different types of suspensions developed as well as the corresponding drive and trailer axle assemblies. It then illustrates that the economics of the dual axle concept are still current today.
1969-02-01
Technical Paper
690172
F. R. Holliday, C. R. Allmen
“In-car” measurement of vehicle loads and stresses is a basic step in solving fatigue design problems associated with passenger cars. The application includes measuring systems and techniques for evaluating fatigue design problems related to energy-absorbing steering columns and automotive gas turbines.
1969-02-01
Technical Paper
690456
Frederick E. Lueck, William A. Gartland, Michael J. Denholm
This paper discusses the development of a family of brake control devices capable of handling all vehicles from passenger cars through air-braked heavy trucks. These devices consist of: Hydraulic load-sensitive proportioning valves for passenger cars, light trucks, and vans; hydraulic load-sensitive proportioning valves for medium trucks; pneumatic load-sensitive proportioning valves for air-braked heavy trucks and tractor/trailer combinations; skid control systems for passenger cars; and skid control systems for trucks and tractor/trailer vehicles. The paper explains how this broad approach to brake controls allows the selection of a system which can be tailored to the particular brake control needs of a specific vehicle and its duty cycle. Except for the passenger car skid control, these devices are capable of being retro-fitted on existing vehicles.
1969-02-01
Technical Paper
690551
J. C. Paterson
The concept of a no-maintenance, heavy-duty, diesel tractor presented in this paper is based on the concept of component life expectancy. Design and engineering improvements of tractor systems and components are recommended for the development of a 500,000-mile, no-maintenance chassis. Such a chassis, together with electronic, computerized maintenance systems working on an on-demand basis, can be expected to generate savings averaging $1448/tractor/year.
HISTORICAL
1969-02-01
Standard
J380_196902
Specific gravity is a nondestructive test used as a quality control check of the consistency of formulation and processing of brake lining. The specific gravity and the range of specific gravity are peculiar to each formulation and, therefore, the acceptable values or range must be established for each formulation by the manufacturer. Specific gravity alone shows nothing about a materials in use performance. The specific gravity of sintered metal powder friction materials, particularly those which have steel backing members, is usually determined somewhat differently. Reference ASTM B 376. Purpose To establish a uniform procedure for determining the specific gravity of brake friction material.
1969-02-01
Technical Paper
690521
Samuel K. Clark, Richard N. Dodge
This paper discusses the measurement of cord loads in pneumatic tires using a direct load transducer. Such an instrument is described in detail together with results of numerous tests. Tire engineers will find this paper of value since it outlines methods for determining cord loads under actual tire operating conditions.
1969-02-01
Technical Paper
690571
Richard D. Houk
This paper was written for quick comprehension without the use of mathematics. It is divided into two sections. The first section describes the component fundamentals of a hydrostatic transmission. The second section covers the mechanical controls used on vehicles, which have hydrostatic transmissions, with regard to engine throttle, transmission, steering, service brakes, and parking brakes.
1969-01-01
Standard
J937A_196901
ABSTRACT
1969-01-01
Standard
J952A_196901
ABSTRACT
HISTORICAL
1969-01-01
Standard
J332_196901
The comfort and fatigue of vehicle passengers is a major engineering consideration. Among the many factors involved are vibratory and auditory disturbances. Tires participate, among other elements of the vehicle, in exciting vibrations and noises. Furthermore, tires also may generate forces leading to lateral drift of the vehicle. This SAE Recommended Practice describes the design requirements for equipment to evaluate some of the characteristic excitations of passenger car and light truck tires which may cause disturbance in vehicles. The kinds of excitations treated result from nonuniformities in the structure of the tire and have their effect when a vehicle bearing the tire travels on a smooth road. This document also describes some broad aspects of the use of the equipment and lists precautionary measures that have arisen out of current experience. The intention underlying these recommendations is to establish a standardized measurement for use by the engineering community.
HISTORICAL
1969-01-01
Standard
J682_196901
For guidance only in regard to highway commercial motor vehicles where protection to the rear against rear wheel splash and stone throw is deemed necessary, the following clearance specifications are recommended.
HISTORICAL
1969-01-01
Standard
J843B_196901
This SAE Recommended Practice establishes a uniform procedure for the level road test of the brake systems of new light-duty trucks and new multipurpose passenger vehicles up to and including 2700 kg (6000 lb) GVW and all classes of new passenger cars. The purpose of the test code is to establish brake system capabilities with regard to: a. Deceleration versus input, as affected by vehicle speed, brake temperature, and usage; b. brake system integrity; c. Stopping ability during emergency or inoperative power assist conditions; d. Water recovery characteristics.
HISTORICAL
1969-01-01
Standard
J379_196901
Gogan hardness, a nondestructive (a penetrator causes shallow surface deformation) method of measuring compressibility, is used as a quality control check of the consistency of formulation and processing of brake lining. Gogan hardness alone shows nothing about a lining's ability to develop friction or to resist fade when used as a friction element in brakes. Gogan hardness varies with formulation, contour, and thickness of the lining. The Gogan hardness and the range of Gogan hardness are peculiar to each formulation, thickness, and contour and, therefore, the acceptable values or range must be established for each formulation and part configuration by the manufacturer.
HISTORICAL
1968-12-01
Standard
AIR1064
This SAE Aerospace Information Report (AIR) has been prepared by a panel of the A-5A Subcommittee to present an overview of the landing gear problems associated with aircraft braking system dynamics, and the approaches to the identification, diagnosis, and solution of these problems. All pertinent system modes of vibration are described. In addition, facilities and techniques available for test and evaluation are presented and discussed, and useful references are cited. The terminology used is intended to be consistent with AIR1489, "Aerospace Landing Gear Systems Terminology", but some terminology herein is not yet included in AIR1489. The panel members include representatives from major brake, landing gear, aircraft, and brake control system manufacturers. In addition, drafts of the document were circulated for input beyond the SAE to other experts in the field.
HISTORICAL
1968-11-01
Standard
J944A_196811
1. SCOPE Evaluation of the energy absorbing properties of the steering wheel assembly of a motor vehicle, or of the relative merit of altemative designs of such assemblies, is a complex problem involving human tolerance, vehicle and occupant dynamics during an accident, and frequency and severity of injuries to various body areas. T\'lO fundamental approaches are being used currently for steering wheel assembly evaluations: laboratory impact tests of varying degrees of complexity, and simulated collision tests. This SAE Recommended Practice describes a simplified laboratory procedure for evaluating the characteristics of steering wheel assemblies under simulated driver impact conditions. Basically, the test procedure employs a torso shaped body block which is impacted against the steering wheel assembly and the transmitted load -time history is measured.
1968-10-01
Magazine
1968-09-01
Magazine
HISTORICAL
1968-09-01
Standard
J360_196809
This SAE Recommended Practice establishes methods to determine grade parking performance with respect to: a. Ability of the parking brake system to lock the braked wheels. b. The vehicle holding or sliding on the grade, fully loaded or unloaded. c. Applied manual effort. d. Unburnished or burnished brake lining friction conditions. e. Down and up grade directions.
1968-08-01
Magazine
1968-07-01
Magazine
HISTORICAL
1968-07-01
Standard
J348_196807
This SAE Standard presents the basic information required for the design and manufacture of a wheel chock.
1968-06-01
Magazine
HISTORICAL
1968-06-01
Standard
J345_196806
This SAE Recommended Practice defines the best known techniques for evaluating peak and locked wheel braking traction. It covers an important phase of tire braking traction, namely, the wet or dry pavement straight ahead conditions. However, this is but a small portion of the whole field of tire traction. As test procedures are established for other phases of this complex study, additional supplementary procedures will be written. A discussion of this entire subject is contained in Appendix B to this recommended practice.
HISTORICAL
1968-05-01
Standard
J513C_196805
This SAE Standard covers complete general and dimensional specifications for refrigeration tube fittings of the flare type specified in Figures 1 to 42 and Tables 1 to 15. These fittings are intended for general use with flared annealed copper tubing in refrigeration applications. Dimensions of single and double 45 degree flares on tubing to be used in conjunction with these fittings are given in Figure 2 and Table 1 of SAE J533. The following general specifications supplement the dimensional data contained in Tables 1 to 15 with respect to all unspecified details.
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