Browse Topic: Driveshafts

Items (28)

Validating the design of CV axle for BAJA SAE ATV

2022-01-077803/29/2022

Abstract— Axle transmits power from the gearbox to the wheels. There are primarily two reasons for reducing the Axles diameter in the case of a bipod CV joint namely, to avoid overdesigning and less articulation angle. As the ATV goes in a bump/ droop, a driveshaft with a larger diameter would hit the walls of the CV joint which creates hindrance in its articulation. And, if the driveshaft is overdesigned, it will add unnecessary weight and effort to the power train which would decrease the overall performance of the vehicle. We have reduced the diameter of the axle using real-time testing data by taking the help of various machines to validate that component not failing under the given load conditions; research work is divided into 3 phases of Data collection, Axle design, and validation. Total 3 test rigs were set up for Data collection and validation, combined with axial design, material selection, heat treatment, and CAE validation. Whereas efficiency of Powertrain (CVT) is also

Bhardwaj, Vasu, Dayal, Neelesh, Saini, Rakesh

Application Guide for Aerospace Hydraulic Motors

ARP4940A (Current)

11/09/2021

This SAE Aerospace Recommended Practice (ARP) is an application guide for fixed and variable displacement hydraulic motors. It provides details of the characteristics of fixed and variable displacement hydraulic motors, architectures, circuit designs, controls, and typical applications. The applications include airborne and defense vehicles with emphasis on high performance applications.

A-6C4 Power Sources Committee

Regulatory Norms and effect on transmission component validation

2021-26-046009/22/2021

With the advent of BS VI regulations, automotive manufacturers are required to innovate the powertrains, fuel systems, exhaust and its after treatment systems to meet the regulatory requirements. The exhaust regulations can be met either by reducing the exhaust gases being generated by the engine (attacking the source) or by treating the exhaust gases in after treatment devices. The choice of the opted system varies with the manufacturer. The after-treatment devices such as catalytic converters are generally mounted in the engine compartment to take advantage of high temperature of exhaust gases to yield the reactions. Such an arrangement imposes a lot of thermal load on the peripheral components such as gearshift cables, bearings, oil seals, driveshafts etc. Thermal shields or thermal sleeve are used to address thermal issue and to protect transmission components. System level validation test requirement of transmission need to be re-visited to considering change in environmental

Tongaonkar, Yogesh Manohar, Patel, Hiral, Tendulkar, Vishveshvar, Bhosale, Vikas, halingale, Amol

Companion Flanges, Type A (External Pilot) and Type S (Internal Pilot)

J1946_201601 (Current)01/26/2016

This SAE Standard specifies the nominal dimensions and tolerances which affect the interchangeability between companion flanges and mating parts. The flanges covered by this document are designated type A and type S. The type A flanges are equivalent to type A ISO 7646. The type S flanges are equivalent to the type S ISO 7647. Type A is an external (male) pilot construction and type S is an internal (female) pilot construction. These flanges are not interchangeable. Dimensions not specified are left to the discretion of the component manufacturer.

Drivetrain Standards Committee

Drivetrain Systems Vibration Analysis Data Requirements

J2455_201504 (Current)

04/15/2015

Product for which data is to be available is for class 6 and larger, i.e., gross vehicle weight > 9.6 kg (19 500 lb).

Truck and Bus Powertrain Committee

Topology & Topography Optimization of a Drive Shaft

2005-01-355211/01/2005

Automotive drive shafts, which transmit power from the transmission unit to the rear axle are in general straight round tubes. An attempt has been made to explore other possible cross-sectional shapes to improve NVH (Noise Vibration and Harshness) performance. The first natural frequency is a very good indicator of the NVH performance. First, finite element based topology optimization and later topography optimizations were tried out. A number of design solutions were obtained from the study and a comparison has been made. A round drive shaft with a bulge at the center has been proposed for stiffenening the drive shaft to improve the first natural frequency.

Krishna, Murali M. R.

Passenger Car and Light Truck Automatic Transmission and Automatic Transaxle Test Code

J651_200506 (Historical)06/22/2005

To provide a means of obtaining the performance characteristics of automatic transmissions and automatic transaxles. It outlines dynamometer tests that map the steady-state characteristics over a range of operations of an automatic transmission/automatic transaxle and provides a method of presenting test data. This procedure must be followed, with similar test facilities so that results obtained from different laboratories are comparable. For this SAE Recommended Practice, the transmission is defined as the complete automatic transmission or transaxle assembly between the engine and the driveshaft(s) used to effect a ratio change in transmitting power. This test procedure deals with the aspect of conducting complete transmission and transaxle assembly testing. However, by its very nature a transmission should be viewed as a compilation of three major component systems: pump, torque converter, and gearbox (all ratio change elements). From a design perspective, it is important that the

Automatic Transmission and Transaxle Committee

Dynamic Bending Stress Analysis of Power Train

2004-01-086503/08/2004

In this paper, the dynamic movement of a driveshaft with imbalance is calculated from the bending stress of a driveshaft at a vehicle test. The synthesis movement is simulated using vertical and horizontal bending models with the centrifugal force induced by the imbalance. Thus, the mechanism that bending stress arises at a driveshaft of a general power train is clarified. The analysis using the simulation shows the relationship between vertical and horizontal stiffness of a power train and dynamic movement of a driveshaft. As a result, a method to reduce bending stress of a driveshaft is proposed.

Ohta, Masayoshi, Nimura, Hiroaki, Hagino, Yasuyuki

Light Truck Driveshaft NVH Analisys and Development Using 6Sigma Tools

2002-01-340911/19/2002

This paper presents the method applied in the development and optimization of a powertrain driveshaft for a Light Truck Diesel. The focus of this optimization is to reduce the vibration consequently improve the NVH (Noise and Vibration Harshness) quality of the vehicle. The paper describes the basic 6sigma methodology, inputs required to perform the 6Sigma method, the experimental work required. The experimental results for an optimized version are also presented and compared to the original one.

Torrezan, Richard Costa, Fraga, Alessandro

Prediction of Driveshaft Critical Speed Using the Transfer Matrix Method

2000-01-346112/04/2000

A Transfer Matrix Method (TMM) based procedure has been developed to model and predict the resonant frequency of one piece driveshaft assemblies. The TMM approach was selected because it allowed the ability to change the geometry of a driveshaft between joint centers. This ability more accurately models some driveshaft types, specifically an inboard slip assembly. When an inboard slip assembly was modeled using the TMM, the TMM prediction was within 6.7% of the actual test results compared to 16.1% using the SAE AE7 prediction with a typical correction factor.

Essi, Thomas M.

Universal Joints and Driveshafts--Nomenclature--Terminology--Application

J901_200012 (Historical)12/01/2000

The following definitions and illustrations are intended to establish common nomenclature and terminology for universal joints and driveshafts used in various driveline applications. In addition, useful guidelines are included for the application of universal joints and driveshafts. For more specific details, see Universal Joint and Driveshaft Design Manual, AE-7.

Driveline Standards Committee

Critical Speed Failure Mode of a Steel Driveshaft

98276411/16/1998

This paper discusses the failure mode of a steel driveshaft as it goes into an unstable state as the shaft approaches its critical speed. Two axial buckling theories, Johnson and Euler, will be used to verify the cause of failure for a driveshaft exhibiting the phenomenon of catastrophic failure at its natural bending frequency.

Periat, Jeff, Hickey, John

High Speed Fixed Constant Velocity Joint for Automotive Driveshaft Applications

98083402/23/1998

A fixed ball Constant Velocity joint has been developed and optimized specifically for automotive driveshafts with articulation angles greater than those permissible with cardan joints. The joint was developed both as an NVH solution to cardan joints and as a lightweight replacement for the centered double cardan joint which exists in many light truck applications today. The joint offers NVH improvements against cardan joints due to its CV nature, and significant improvement when compared to centered double cardan driveshafts because of reduced overhang, improved runout control, compact design and a 20% weight reduction. Internal geometry of the joint has been optimized to minimize heat generation during operation. The joint has been successfully endurance tested running at 75 kilowatts at angles of 10.

Johnson, Rory

Chassis Cross-Member Design Using Shape Optimization - A Case Study

981011

02/23/1998

A case study of the application of shape optimization technique to the design of the third cross-member of an automotive chassis has been presented. Its fundamental frequency is only marginally higher than the maximum operating frequency of the transmission and drive shaft, which are mounted on this cross-member. The objective is to raise the cross-member frequency as high as possible so that there is no resonance and resulting fatigue damage. A sizing optimization indicated that the mass was a predominant factor. Shape optimization using approximate direct linearization method was performed and a number of design directions were obtained. The fundamental frequency of the cross-member was raised by about 4 Hz.

Krishna, Murali M.R.