Browse Topic: Transmission linkages

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Contribution of the Mechanical Linkage in Gear Shift Feel of North-South Transmission06-11-01-000810/8/2017
Today’s automotive industry is facing cutthroat competition, especially in passenger vehicle business. Manufacturers around the globe are developing innovative and new products keeping focus on end customer; thus customer's opinion and perception about the product has become a factor of prime importance. Customer touch points such as gear shift lever, clutch, brakes, steering etc. are thus gaining more and more importance. Car companies are trying to induce more and more luxuries in these touch points so that they impress customer and create a positive opinion about the product. On the other hand manufacturers are also trying to manage profits. Companies thus need to find the best fit solution for improvising customer touch points with optimized costs. The performance of these touch points is driven by subsystems of mechanical components like mechanical linkage. Quality, functioning and durability of these mechanical component subsystems play a significant role in performance of touch points like gear shift lever. During development of 6-Speed North-South transmission, we came across some facts indicating the relation between the performance of mechanical shifting linkage system and gear shift feel of the car. Mechanical linkage stiffness, free play and efficiency are the parameters playing a vital role in its functioning and thereby gear shift feel. In this paper a case study is discussed mentioning work related to improvement in the mechanical linkage for improving gear shift feel. The paper explains learning's about mechanical linkage kinematics, force calculations and transformations, mechanism models we worked on, the interrelations between linkage parameters and how these help to improvise gear shift feel. Discussion is made on noise, vibrations, shift lever rattle cause and effects, the role of mechanical linkage in all these. Optimization of linkage stiffness, weight, inertia and angles between links with help of Creo-simulation model is described and the conclusion is drawn in the end.
Deshmane, Santosh, Gurav, Onkar P., Sahu, Vipul
Engineering Method for Rating Shift Quality93299611/1/1993
It is common for difficult shifting to occur in synchronized transmissions. High shift effort is recognized as a basic performance malfunction that takes place during synchronization. This paper examines shift quality in vehicles with synchronized transmissions. The present study is working on three categories: a mathematical model and computer simulation of transmission shifts, an experimental verification of the model and program, and an engineering method for rating shift quality. The mathematical model in this study is a refinement of a model from an earlier paper [1]. With experience, this model has seen revisions that allow the results to be more accurate than the previous ones. The model takes into considerations many elements that affect the synchronizing process such as: synchronizing torque, inertia of both clutch disc(s) and transmission components, clutch drag, viscous drag in the transmission, shifting RPM's, etc. Furthermore, the model includes parameters of the shift linkage that effect the synchronizing torque such as: handball load, mechanical advantage and efficiency of the linkage, resilient forces of some linkage components, material and geometry of synchronizers, etc. The computer simulation program has been written based on the above mathematical model. Simulation experiments give results in terms of synchronizing time for the maximum, but acceptable, handball load. The model and the program were correlated through extensive in-truck experimentation. The important parameters affecting shift quality, and especially shift effort, were recorded for various actual shifts performed in many different ways by various operators. The actual data was reflected to the certain unified conditions to develop a numerical correlation with theoretical results. This correlated simulation program allowed an in depth study into all of the parameters of shift quality. With this data, conclusions and recommendations were made as to the important concerning shift quality. Moreover, the simulation program was used to develop an engineering method for rating shift quality. Examples of the rating system are illustrated by a shift quality matrix. The present study will be helpful towards making further advancement in the area of shift quality and future developments in the design of synchronizers and efficient linkages.
Szadkowski, Andrew, McNerney, Gerald J.
Hitch System Comparison — Mechanical, Hydraulic, Electronic8411309/1/1984
Modern agricultural tractors are equipped with a hitch control system. These may be mechanical-hydraulic, hydraulic-hydraulic, or electronic-hydraulic. With the variety of design options open to the tractor manufacturer, it is important to select the system which best fits the manufacturer and end user. This paper presents a comprehensive comparison of each system. Robert Bosch has had many years experience in the design and manufacture of components for hitch systems, and hopes to help designers choose the approach best suited for them.
Hesse, Horst, Schrader, Wolfgang
Utility Equipment Installation Problems: Weight Distribution8400962/1/1984
Weight distribution problems related to installing utility equipment on trucks can be reduced by considerations from the truck manufacturer's design engineers, more and better engineering from the users, equipment installers, and truck representatives in selecting the specifications, and new and increased communications, Weight distribution problems causing overloaded trucks are serious mistakes resulting in illegal and defective manufacture, liability, voided warranties, and operational problems.
Chappell, N.W.
Mobile Equipment Efficiency Management with Servo Controlled Medium Duty Hydrostatic Transmissions8312759/12/1983
MEDIUM DUTY MOBILE EQUIPMENT CAN REALIZE PRODUCTIVITY GAINS THROUGH THE APPLICATION OF SERVO CONTROLLED HYDROSTATIC TRANSMISSIONS. TO ACHIEVE THESE GAINS, HYDROSTATIC TRANSMISSIONS FOR MEDIUM DUTY VEHICLES MUST POSSESS DESIGN FEATURES WHICH PROMOTE MANAGEMENT OF DRIVELINE EFFICIENCY. HOWEVER, TO ACHIEVE COMPATIBILITY WITH THE MEDIUM DUTY VEHICLE, THESE TRANSMISSIONS SHOULD BE DESIGNED WITH THE COST, LIFE, AND SIZE GOALS OF MEDIUM DUTY IN MIND. THIS PAPER PROVIDES DEFINITION OF THE MEDIUM DUTY CONCEPT AS IT PERTAINS TO HYDROSTATIC TRANSMISSION APPLICATION AND DESIGN. EXAMPLES OF THE POTENTIAL FOR PRODUCTIVITY ENHANCEMENT THROUGH THE USE OF MEDIUM DUTY HYDROSTATIC TRANSMISSIONS WITH INTEGRATED SERVO CONTROL ARE PRESENTED.
Hull, Walter E., McConeghey, Gary D.
Electric Controls for Powershift Transmissions6802614/9/1968
In the past twenty years there have been extensive changes in the design concepts of heavy-duty vehicles. For instance, vehicle size has been increased, some vehicles are articulated, and some are multi-powered. These new vehicle designs with their complex geometry and often remotely-located power plants have made the range selection of the Powershift transmission difficult. Mechanical shift control systems have shown certain limitations in controlling the new vehicles and are being replaced with other system types which are controlled by air, hydraulics, or electricity. A new electric shift control system is presented in this paper. This control is easily adaptable to the new vehicle concepts and offers the additional advantages of shift inhibiting and increased transmission durability. Because of its flexibility and built-in safeguards, this system offers many advantages that should lead to its wide acceptance in future vehicle designs.
Black, R. L., Schaefer, R. H.
The Buick Flight Pitch Dynaflow5900501/1/1959
THE Buick Flight Pitch Dynaflow is unique among automatic transmissions in that it contains no gear shifts. Rather, it employs three turbines, each geared at its own speed ratio to the driven shafts. The transmission contains a 5-element torque converter — an engine-driven pump member, three turbines, and the stator — combined with two planetary gearsets. The total transmission weighs about 200 lb, a result of the extensive use of aluminum. The authors outline in detail the design of the unit and its functioning.
McFarland, Forest, Chapman, Charles S.
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