## ABSTRACT

Figure 24.1 gives a comparison of the negative AI https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429458521/205bdafa-15e9-4134-b5d8-e3f345ec995c/content/equ24_0003.tif"/> - and AI ¯ https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429458521/205bdafa-15e9-4134-b5d8-e3f345ec995c/content/equ24_0004.tif"/> -planetary gear trains ( AI ¯ https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429458521/205bdafa-15e9-4134-b5d8-e3f345ec995c/content/equ24_0005.tif"/> -PGTs), out of which the positive AAI https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429458521/205bdafa-15e9-4134-b5d8-e3f345ec995c/content/equ24_0006.tif"/> - and AAI ¯ https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429458521/205bdafa-15e9-4134-b5d8-e3f345ec995c/content/equ24_0007.tif"/> -PGTs are obtained by adding another two- or one-rim planet to each of the power branches. Their basic speed ratio is positive: i 0 = ω 1 r e l ω 4 r e l = ω 1 − ω H ω 4 − ω H = { z 2 z 1 ⋅ z 3 z ′ 2 ⋅ z 4 z ′ 3 z 4 z 1 } > 0 . https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429458521/205bdafa-15e9-4134-b5d8-e3f345ec995c/content/equ24_0008.tif"/>