EIGHT-SPEED GEARBOX MECHANISM WITH A CLUTCH, INTERMESHING GEAR CONES AND A SLIDING KEY

Clutch 3 slides along square guide a of shaft 1 and can engage either gear 5 or 6 which rotate freely on shaft 1 and are in constant engagement with gears 7 and 8. Gears 7 and 8 and cone gears 9, 10, 11 and 12 are keyed to intermediate shaft 17. Cone gears 9, 10, 11 and 12 are in constant engagement with cone gears 13, 14, 15 and 16 which rotate freely about shaft 2. Rectangular sliding key 4 can be shifted along shaft 2, keying one of the gears to this shaft. The sum of the pitch radii is the same for all the pairs of meshing cone gears. If clutch 3 is engaged to gear 5, four different transmission ratios can be obtained, depending on which gear, 13, 14, 15 or 16, is engaged by key 4. Thus i₁₂=(z₇/z₅)(z₁₃/z₉), i₁₂=(z₇/z₅)(z₁₄/z₁₀), i₁₂=(z₇/z₅)(z₁₅/z₁₁) and i₁₂=(z₇/z₅)(z₁₆/z₁₂). If clutch 3 is engaged to gear 6, four more different transmission ratios are obtained. Thus i₁₂=(z₈/z₆)(z₁₃/z₉), i₁₂=(z₈/z₆)(z₁₄/z₁₀), i₁₂=(z₈/z₆)(z₁₅/z₁₁) and i₁₂=(z₈/z₆)(z₁₆/z₁₂) where z₅, z₆, ..., z₁₆ are the numbers of teeth of gears 5, 6, ..., 16. Thus, when driving shaft 1 rotates, driven shaft 2 can have any one of eight different speeds.
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