A Kinematics and Power Flow Analysis Methodology for Automatic Transmission Planetary Gear Trains
Author:
Kahraman A.1, Ligata H.1, Kienzle K.2, Zini D. M.2
Affiliation:
1. Department of Mechanical Engineering, The Ohio State University, 206 W. 18th Avenue, Columbus, OH 43210 2. General Motors Gear Center, 30240 Oak Creek Drive, Wixom, MI 48393
Abstract
A generalized formulation for analyzing speeds and forces of the gear components of planetary automatic transmissions is proposed. The formulation is capable of analyzing any typical one-degree-of-freedom automatic transmission gear train containing any number of simple, compound or complex-compound planetary gear sets. The formulation consists of three components: a kinematic analysis formulation to compute rotational speeds of gears and carriers, a gear ratio and kinematic configuration search algorithm, and a power flow analysis formulation. The kinematics component computes rotational speeds of gears and carriers. Given the type and number of planetary gear sets, the search algorithm determines all possible kinematic configurations and gear tooth count combinations that result in a required set of gear ratios while eliminating all kinematic redundancies and unfavorable clutching sequences. The third component, the power-flow analysis formulation, performs a complete static force (power-flow) analysis to determine all gear and bearing forces and moments, and clutch and connection torque values. A five-speed transmission example is considered to highlight the capabilities of the proposed formulation.
Publisher
ASME International
Subject
Computer Graphics and Computer-Aided Design,Computer Science Applications,Mechanical Engineering,Mechanics of Materials
Reference16 articles.
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