Two gear clusters, 3 and 4, with gears 6, 7, 8 and 9 slide independently of each other along square guide a of shaft 1. Clutch 5 slides along square guide b of shaft 2 and can engage the clutch member of either gear 15 or 16 which rotate freely about shaft 2 and are in constant engagement with gears 11 and 14. Gears 10, 11, 12, 13 and 14 are keyed to intermediate shaft 17. If clutch 5 is engaged to gear 15, four different transmission ratios can be obtained when a gear, 6, 7, 8 or 9, of clusters 3 and 4, is shifted into engagement wi th the corresponding gear, 10, 11, 12 or 13. Thus i₁₂=(z₁₀/z₆)(z₁₅/z₁₁), i₁₂=z₁₅/z₇, i₁₂=(z₁₂/z₈)(z₁₅/z₁₁) and i₁₂=(z₁₃/z₉)(z₁₅/z₁₁). If clutch 5 is engaged to gear 16, four more different transmission ratios are obtained. Thus i₁₂=(z₁₀/z₆)(z₁₆/z₁₄), i₁₂=(z₁₁/z₇)(z₁₆/z₁₄), i₁₂=(z₁₂/z₈)(z₁₆/z₁₄) and i₁₂=(z₁₃/z₉)(z₁₆/z₁₄) where z₆, z₇, . . . , z₁₆ are the numbers of teeth of gears 6, 7, . . ., 16. Thus, when driving shaft 1 rotates, driven shaft 2 can have any one of eight different speeds.
$2863$CxG,SR$