Maximum mechanical efficiency of infinitely variable transmissions

Hong Sen Yan; Long Chang Hsieh

doi:10.1016/0094-114X(94)90120-1

Maximum mechanical efficiency of infinitely variable transmissions

Hong Sen Yan, Long Chang Hsieh

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Equations for the mechanical efficiency of infinitely variable transmissions (IVT) are derived. As a result, we conclude that: (1) an IVT is of input-coupled type, (2) the mechanical efficiency of an IVT depends only on its allowable maximum speed ratio (R_r)_aow, (3) the mechanical efficiency of an IVT can only be improved by increasing (R_v)_aow, the efficiency of planetary gear train (η_pr) and the efficiency of continuously variable unit (η_v), and (4) an IVT with five-member planetary gear train of type I power flow has maximum mechanical efficiency. A design example is also presented.

Original language	English
Pages (from-to)	777-784
Number of pages	8
Journal	Mechanism and Machine Theory
Volume	29
Issue number	5
DOIs	https://doi.org/10.1016/0094-114X(94)90120-1
Publication status	Published - 1994 Jul

All Science Journal Classification (ASJC) codes

Bioengineering
Mechanics of Materials
Mechanical Engineering
Computer Science Applications

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AB - Equations for the mechanical efficiency of infinitely variable transmissions (IVT) are derived. As a result, we conclude that: (1) an IVT is of input-coupled type, (2) the mechanical efficiency of an IVT depends only on its allowable maximum speed ratio (Rr)aow, (3) the mechanical efficiency of an IVT can only be improved by increasing (Rv)aow, the efficiency of planetary gear train (ηpr) and the efficiency of continuously variable unit (ηv), and (4) an IVT with five-member planetary gear train of type I power flow has maximum mechanical efficiency. A design example is also presented.

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