Patent GB-1170685-A (GB)
Title: Improvements in or relating to Multiple Speed Hubs
IPC: B62M11/16
Filed: 1967-01-31
Abstract: 1,170,685. Change-speed gear. FICHTEL & SACHS A.G. 31 Jan., 1967 [2 Feb., 1966], No. 4645/67. Heading F2D. In a four-speed cycle hub having two sun ring planet trains 9, 25 in series, ratio shift in the first train 9 is effected by a hand control through a pull-rod 19 and thrust block 17 whilst ratio shift in the second train 25 is effected by back pedalling or by output speedresponsive means. The second train comprises planets 25 on a carrier 26 meshing a fixed sun 24 and ring gear 27. The carrier of the second train is driven by the first train and a one-way pawl-and-ratchet clutch 32, 35 between the ring gear 27 and a driven hub 2 is controlled by back-pedalling or output speed-responsive means. As shown, and in Figs. 4-27 (not shown), the ratchet clutch 32, 35 is controlled by back-pedalling. A control sleeve 34 has apertures (36) through which the panels 32 project to engage the ratchet 35. During backpedalling the sleeve 34 is held by a drag spring 33 so that reverse rotation of the pawl carrier brings the pawls 32 within the sleeve to engage behind projections (37) thereon for clutch release or opposite the apertures (36) for clutch engagement. A one-way brake 38 limits backpedalling. As shown, the first train comprises planets 9 on a carrier 8 fast with the carrier 26 of the second train and meshing a fixed sun 7 and ring gear 11. Pawls 22 of a one-way clutch are carried by the carrier 8 and engage a ratchet 23 on the hub 2. The hand control axially moves a clutch sleeve 12 to selectively connect a driving sprocket 4a to the planet carrier 8 or ring gear 11 for direct or reduced ratio respectively in the first train. The carrier 8 drives the hub 2 through the one-way clutch 22, 23 for low and second ratios, the oneway clutch 32, 35 being disengaged. For third and high ratios the carrier 8 drives the hub 2 through the second overdrive train 25 and oneway clutch 32, 35, the clutch 22, 23 overrunning. In Figs. 4 and 5 (not shown), the driving sprocket is fast with the carrier (46) of the first train and the hand control axially moves a clutch sleeve (52) to selectively connect the planet carrier (48) of the second train to the carrier (46) or ring gear (47) for direct and overdrive ratios respectively in the first train. In Figs. 6 and 7 (not shown), the driving sprocket is fast with the ring gear (47) and the clutch sleeve (52) selectively connects the planet carrier (48) of the second train to the carrier (46) and ring (47) for reduced and direct ratios respectively in the first train. Figs. 8 and 9 (not shown) are similar to Fig. 1 but the one-way clutch is provided between the ring gear (47) and hub to provide direct and overdrive ratios in the first train when the ring gear drives the hub but reduced and direct ratios in the first train when the planet carrier drives the hub through the second train. Figs. 10 and 11 (not shown) are similar to Fig. 1 but the planet carrier (48) of the second train is connected to the ring gear (47) of the first train and the one-way clutch (49) is provided between the ring gear (47) and the hub to provide direct and overdrive ratios in the first train. In Figs. 12 and 13 (not shown) the driving sprocket is fast with the planet carrier (46) of the first train and ratchet clutches (53, 54) are provided between the ring gear (47) and carrier (46) respectively and the carrier (48) of the second train. The ratchet clutch (53) may be engaged and disengaged by the hand control for direct and overdrive ratios in the first train. Figs. 14 and 15 (not shown) are similar to Figs. 12 and 13 but the driving sprocket is fast with the ring gear to provide reduced and direct ratios in the first train. In Figs. 16-27 (not shown) the sun (57) of the first train is slid axially by the hand control between a position in which it locks the first train for direct-drive and a position in which it is held against rotation for a reduced or overdrive ratio in the first train. In Figs. 16, 17, 20, 21, 24, 25 the driving sprocket is fast with the ring gear (47) and the planet carrier (46) is fast with the planet carrier (48) of the second train to provide reduced and direct ratios in the first train whilst in Figs. 18, 19, 22, 23, 26, 27 the driving sprocket is fast with the planet carrier (46) and the ring gear (47) is fast with the carrier of the second carrier (48) to provide direct and overdrive ratios in the first train. In Fig. 28 (not shown) the ratchet clutch (321, 35<1>) between the hub (2<1>) and ring gear (27<1>) of the second train is controlled by centrifugal weights (51<1>) on a carrier (52<1>) driven through an idler (57<1>) from the hub (2<1>). The weights (51<1>) are urged inward by springs (56<1>) to disengage the clutch and at a predetermined speed of the hub move outward to release the pawls (32<1>) for clutch engagement.