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Technical Paper
2014-09-28
Shiwalik Ghosh, Baskar Anthonysamy, Ravi Kaushik
Abstract Prevailing cut-throat competition in Indian Two wheeler market requires design engineers to enhance performance of traditional braking systems with reduction in cost and weight. The increasing need of road safety however requires the braking system to minimize stopping distance and increasing Mean Fully Developed Deceleration (MFDD). The purpose of this study is to augment the braking performance of two wheeler by comparing various combinations of twin leading drum brake layouts by method of Virtual Simulation. The conventional drum brake system utilizes one cam, one pivot, one leading shoe member and one trailing shoe member. In the event of braking, leading shoe causes the generation of drag force. The other shoe is “trailing”, moving against the direction of rotation, is thrown away from the friction surface of the drum and is far less effective. The present study highlights the incorporation and enhancement of braking characteristics of bigger brake drum system into smaller brake drum system through the adoption of double leading shoe concept with the added advantage of reduction in cost.
Technical Paper
2014-09-28
Toshikazu Okamura
Abstract There are various processes for finishing the friction surfaces of a brake disc, which affect the braking effectiveness of a vehicle in the early stages of use in some cases. To examine the interaction between the disc surface texture, rotational direction, and friction material, a series of experiments on a tribotester using small-scale specimens was conducted. In a previous paper (2013-01-2056), the results from the first series of experiments, which involved of thirty disc surface textures and a less aggressive non-asbestos organic (NAO) friction material in on-brake-drag conditions combining constant speed and normal-load, was reported. Disc surfaces were finished by the following finishing processes in two rotational directions: turning under four cutting conditions, roller burnishing after turning, turning with a wiper insert, and grinding with two stones. Contact-pressure dependency of friction and wear was confirmed. Roller-burnished and wiper-turned discs exhibited different friction and wear at a certain contact pressure between rotational directions in the turning process.
Article
2014-09-16
A racecar fitted with a prototype rear suspension will compete in the Sports Car Club of America's 2015 season as a proof-of-concept demonstrator for using thermoplastic composite suspension components in future light-duty vehicle production applications.
Article
2014-09-15
Germany's ZF has entered into a definitive agreement to acquire U.S.-based TRW Automotive Holdings Corp. for $13.5 billion, according to a Sept. 15 TRW press release. ZF has stated that TRW will be operated as a separate business division within ZF.
WIP Standard
2014-09-15
The procedure describes how to measure the deflection of a brake pad, noise insulator, and brake pad assembly.
WIP Standard
2014-09-15
This SAE Recommended Practice establishes uniform engineering nomenclature for wheels, hubs, rims, and their components used in truck, bus, and trailer applications. This nomenclature and accompanying drawings are intended to define functional truck wheel, hub, and rim designs. The International Standard (ISO) nomenclature is shown in parentheses when different than SAE J393.
Standard
2014-09-09
This SAE Standard covers hose fabricated from fabric braid and synthetic rubber, assembled with end fittings for use in automotive power steering applications at pressures as indicated in Table 1B, as flexible connections within the temperature range of -40 ×C (-40 ×F) to 121×C (250 ×F) average, 135 ×C (275 ×F) maximum peaks. These hoses are intended for use in applications where reduction in amplitude of pump pressure pulsations is not required.
Standard
2014-09-09
This SAE Recommended Practice defines an Inertia Dynamometer Test procedure that assesses the effectiveness behavior of a friction material with regard to pressure, temperature and speed for motor vehicles fitted with hydraulic brake actuation. The main purpose of SAE J2522 is to compare friction materials under the most equal conditions possible. To account for the cooling behavior of different test stands, the fade sections are temperature-controlled.
Article
2014-09-04
Mazda Motor Corp. on Wednesday evening unveiled the fourth-generation MX-5 Miata, which adopts both SkyActiv technology and Mazda’s “Kodo” (or "Soul of Motion") design language. The MX-5, first introduced 25 years ago, maintains Mazda’s original aim of offering the pure driving fun that only a lightweight sports car can provide.
Book
2014-09-03
William C. Messner
Over the years, the DARPA Challenges in the United States have galvanized interest in autonomous cars, making them a real possibility in the mind of the public, but autonomous and unmanned vehicles have been increasingly employed in many roles on land, in the water, and in the air. Military applications have received a great deal of attention, with weaponized unmanned aircraft (drones) being the most prominent. However, unmanned vehicles with varying degrees of autonomy already have many civilian applications. Some of these are quite familiar (such as the Roomba autonomous vacuum cleaner), while others remain largely out of the public eye (such as autonomous farm equipment). Additional applications and more capable vehicles are rapidly coming to the markets in the years ahead. This book examines a number of economically important areas in which unmanned and autonomous vehicles, also understood here as autonomous technologies, are already used or soon will be. Co-published by SAE International and AUVSI, Autonomous Technologies: Applications That Matter will assist the reader in identifying profitable opportunities and avoiding costly misconceptions with respect to civilian applications of autonomous vehicle technologies as it brings together chapters on how air, water, and ground vehicles are becoming ever more used and appreciated.
Magazine
2014-09-02
2015 New Vehicle & Technology Preview Automotive Engineering editors take a look at some of the more intriguing new models, including GM's full-size SUVs, BMW's i8 plug-in-hybrid sports car, Acura's TLX sedan, and Ford's F-150 full-size pickup truck. Picturing the map for smoother rides Next-gen A/C As conventional vapor-compression cooling technology faces phase-out, what could take its place? The U.S. Department of Energy's ARPA-e has funded research to help answer this question.
Article
2014-08-29
NIRA Dynamics AB has developed friction algorithms for where the rubber meets the road, and is seeking partners to put them into action for improved safety. Existing driver-assistance systems are “steps in the right direction, but with the new algorithms by NIRA cars can take a large step further and get even smarter,” the company says in an Aug. 28 press release.
Standard
2014-08-28
This SAE Standard covers motor vehicle brake fluids of the nonpetroleum type, based upon glycols, glycolethers and appropriate inhibitors, for use in the braking system of any motor vehicle such as a passenger car, truck, bus, or trailer. These fluids are not intended for use under arctic conditions. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM).
Standard
2014-08-28
This SAE Standard covers motor vehicle brake fluids of the nonpetroleum type, based upon glycols, glycol ethers, and borates of glycolethers, and appropriate inhibitors, for use in the braking system of any motor vehicle such as a passenger car, truck, bus, or trailer. These fluids are not intended for use under arctic conditions. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM).
WIP Standard
2014-08-26
This SAE Standard covers the minimum requirements for nonmetallic tubing as manufactured for use in air brake systems which tubing is different from that described in SAE J844. It is not intended to cover tubing for any portion of the system which operates continuously below - 40 degrees C or above +93 degrees C, above a maximum working gage pressure of 1.0 MPa, or in an area subject to attack by battery acid. This tubing is intended for use in the brake system for connections, which maintain a basically fixed relationship between components during vehicle operation. Coiled tube assemblies required for those installations where flexing occurs are covered by this document, SAE J1131 and SAE J2494-3, to the extent of setting minimum requirements on the essentially straight tube and tube fitting connections which are used in the construction of such assemblies.
Standard
2014-08-26
This document has been declared "Stabilized" by the SAE Motorcycle Technical Steering Committee and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newer technology may exist. This SAE Recommended Practice establishes performance requirements for the service brake systems of all classes of motorcycles intended for highway use.
Standard
2014-08-20
This SAE Standard applies to self-propelled, rider operated, sweepers and scrubbers as defined in SAE J2130 with maximum machine level surface speeds up to 32 km/h. Machines capable of speeds equal to and greater than 32 km/h are not covered by this document.
Article
2014-08-15
To achieve weight savings in vehicles, OEMs and component suppliers are increasingly using ultra-high-strength steel, aluminum, magnesium, plastics, and composites. One strategy is to develop components using a multi-material concept. Ashok Leyland researchers used this approach when developing a bimetal brake drum with cast-iron inner ring and aluminum outer shell.
Article
2014-08-13
Rick Phillips, Senior Director, Commercial and OTR Sales, for Yokohama Tire Corp., provides his thoughts on the company's first U.S. commercial tire plant, scheduled to open in October 2015, as well as what the market can expect in the coming years.
Article
2014-08-12
Replacing the TSX and TL models, the all-new 2015 TLX is positioned at the heart of the Acura sedan lineup, boasting two advanced new powertrains, including a “world’s first” eight-speed DCT with torque converter, and next-generation handling technologies.
Standard
2014-08-11
The J1939 Digital Annex The J1939 Digital Annex, introduced in August 2013, offers key J1939 technical data in an Electronic Spreadsheet that can be easily searched, sorted, and adapted to other formats. J1939DA contains all of the SPNs (parameters), PGNs (messages), and other J1939 data previously published in the SAE J1939 top level document. J1939DA also contains all of the SLOTs, Manufacturer ID Codes, NAME Functions, and Preferred Addresses previously published in the SAE J1939 top level and the J1939-71 document. J1939DA contains the complete technical details for all of the SPNs and PGNs previously published in the SAE J1939-71 document. For all other SPNs and PGNs which are published in a document other than SAE J1939-71, J1939DA lists only basic details along with a reference to the document that contains the complete technical details. J1939DA replaces, and expands upon, the 1939 Companion Spreadsheet (CS1939), which was last published through November 2012. The data fields included in J1939DA for PGNs are: PGN Parameter Group Label Acronyn EDP DP PF PGN Length PS PGN Description Multipacket Transmission Rate PGN Data Length Default Priority PGN Reference PGN Document The data fields included in J1939DA for SPNs are: SPN SPN Name SPN Description SPN Length Resolution Offset Data Range Operational Range Units SLOT Identifier SPN Type SPN Reference SPN Document The J1939 Digital Annex is current through Second Quarter 2014 and can be purchased separately or as part of the SAE J1939 Standards Collection on the Web.
Article
2014-08-01
Researchers aim to develop a composite crashbox suitable for 1000 parts/day production at low cost and adapted to current mass-market vehicle design. Various matrixes, preform types, and manufacturing processes have been evaluated by axial and 15° off-axis crash tests. Solutions for short-term development are proposed, with 66% weight reduction compared to current steel parts, and an estimated price of less than €5 per saved kg.
WIP Standard
2014-08-01
The vacuum brake hose is intended for use in the power braking systems of vehicles or as connections on transmission lines in combinations of vehicles or systems thereof. For the purposes of clearly identifying hose classification and for specification simplification, vacuum brake hose is divided into two types: heavy-wall Type H, and light-wall Type L.
Technical Paper
2014-08-01
Valentin Ivanov, Barys Shyrokau, Dzmitry Savitski, Javier Orus, Rubén Meneses, José-Manuel Rodríguez-Fortún, Johan Theunissen, Karel Janssen
Abstract The paper introduces the results of the development of anti-lock brake system (ABS) for full electric vehicle with individually controlled near-wheel motors. The braking functions in the target vehicle are realized with electro-hydraulic decoupled friction brake system and electric motors operating in a braking mode. The proposed ABS controller is based on the direct slip and velocity control and includes several main blocks for computing of predictive (feedforward) and reactive (feedback) brake torque, wheel slip observer, slip target adaptation, and the algorithm of brake blending between friction brakes and electric motors. The functionality of developed ABS has been investigated on the HIL test rig for straight-line braking manoeuvres on different surfaces with variation of initial velocity. The obtained experimental results have been compared with the operation of baseline algorithm of a hydraulic ABS and have demonstrated a marked effect in braking performance.
Standard
2014-07-30
This recommended practice contains dimensions and tolerances for spindles in the interface area. Interfacing components include axle spindle, bearing cones, bearing spacer, seal and wheel hub. This recommended practice is intended for axles commonly used on Class 7 and 8 commercial vehicles. Included are SAE axle configurations FF, FL, I80, L, N, P, R, U, and W.
Standard
2014-07-29
This SAE Aerospace Information Report (AIR) describes the design approaches used for current applications of aircraft Brake-by-Wire (BBW) control systems. The document also discusses the experience gained during service, and covers system, ergonomic, hardware, and development aspects. The document includes the lessons that have been learned during application of the technology. Although there are a variety of approaches that have been used in the design of BBW systems, the main focus of this document is on the current state of the art systems.
Article
2014-07-25
ZF Friedrichshafen AG has formed a joint venture with YTO, a leading manufacturer of construction and agricultural machines, on the production of tractor steering axles for vehicles from 25 to 230 hp (19 to 172 kW).
Article
2014-07-24
WABCO recently opened a new Application Engineering Center in Pune, the supplier’s second such facility in India. The new center will allow WABCO’s team of application and test engineers to work closely with global commercial vehicle (CV) manufacturers in India to jointly develop customized products and solutions across a broad range of vehicle platforms, the company said in a release. 
Article
2014-07-24
Troy, MI-based Meritor, Inc. and brake system supplier Brakes India, Ltd. have signed a licensing and technology assistance agreement for the manufacture and sale of Meritor ELSA air disc brakes in India.
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