Axle Ratios and Transmission Steps

CARL D. PETERSON

doi:10.4271/290042

1929-01-01

Axle Ratios and Transmission Steps 290042

STATING that improvements can be made in the smoothness, flexibility and economy of motor-cars by the provision of axle ratios and transmission steps that will make high road-speeds possible with lower engine-speeds than at present, and without increasing the size of the engine, the author presents arguments for the provision of two quiet and efficient gear-ratios.

He asserts that the desired result can be obtained with either a two-speed rear-axle or a four-speed transmission having a quiet geared third speed, and a discussion is given of the considerations that determined the ratios actually selected in an experimental car fitted with a four-speed transmission having an internal-gear train for obtaining the third speed.

Charts are included which show the car speeds at various engine-speeds and the grades that can be climbed with the several gear-ratios.

The beginning of a tendency toward the use of transmissions of this type in Europe is reported at the conclusion of the paper. The advantages resulting from the construction are said to justify its use, provided the gear ratios are well chosen.

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Axle Ratios and Transmission Steps 290042

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