Gear 8 rotates freely on shaft 1 and has clutch teeth a which can engage teeth b of clutch member 7 at the left end of sleeve 3. Sleeve 3 slides along splines c of shaft 1 and is integral with gears 4 and 5. Gears 9, 10, 11 and 13 are keyed to shaft 6. Gears 8 and 9 are in constant engagement. When lever 2 is shifted to the extreme left, teeth b of clutch member 7 are engaged to teeth a of gear 8 so that rotation is transmitted to shaft 6 through gears 8 and 9 with the transmission ratio i₁₆=-z₉/z₈ where z₈ and z₉ are the numbers of teeth of gears 8 and 9. When gear 4 is shifted into engagement with gear 11, or gear 5 into engagement with gear 10, the corresponding transmission ratios i₁₆=-z₁₁/z₄ and i₁₆=-z₁₀/z₅ where z₄, z₅, z₁₀ and z₁₁ are the numbers of teeth of gears 4, 5, 10 and 11. When lever 2 is shifted to the extreme right , gear 4 is brought into engagement with gear 12 which rotates freely about intermediate shaft 14 and is in constant engagement with gear 13. The axis of shaft 14 is not in the plane passing through the axes of shafts 1 and 6. The fourth transmission ratio is i₁₆=z₁₃/z₄ and shaft 6 is reversed by this engagement. Thus driven shaft 6 has three forward speeds and one reverse speed.
$2855$CxG,SR$