SU364492A1 - TWO-SPEED TRANSMISSION FOR BIKE - Google Patents

Description

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The invention relates to "mechanical engineering" and concerns a two-stage transmission for a bicycle.

Two-stage gears for a bicycle are known, containing a leading sprocket on the axis of the ice line, a driven sprocket on the axis of the rear wheel hub of the bicycle “endless chain.

The proposed transmission differs from those known in that a leading sprocket is mounted on the axis of the bicycle pedals and a supporting sprocket on the bike's frame is equipped with a freewheel, and all sprockets are covered by an endless chain forming a double loop, while the leading sprockets are mounted in bearings on the axis of the pedals, made with inclined "annular sections, passing into the radial sockets and forming a curvilinear groove in which the coupling is movably mounted, made with Harem, the moving of the groove, and with slots which interact with the grooves on the inner diameters of the drive sprockets. This provides unidirectional movement of the pedals when switching speeds.

FIG. 1 depicts the proposed two; upenchat transfer; in fig. 2 is a section along A-A in FIG. one; in fig. 3 - sweep curved groove.

The two-stage gear for a bicycle consists of leading asterisks / and 2, which are mounted in sub-bearings 3 on the axis 4 of the pedals 5, an endless chain 6 spanning

drive sprockets with a driven sprocket 7 on the rear wheel axle 8 and with a supporting sprocket 9 mounted on the bicycle's ralte. The supporting sprocket 9 is equipped with a freewheel Y.

On the axis 4, there are inclined // and annular 12 sections, which pass into the radial sockets 13 and form a curved groove a, in which the coupling 14 with the biscuit 15 is movably mounted.

On the outer diameter of the coupling 14 is made slits 16, interacting with the grooves b, made on the inner dia, meters leading sprockets / and 2.

On axis 4, pedals 5 are fixed

sleeve 17.

A two-stage gear for a bicycle works as follows.

When the bicycle pedals rotate, the movement from axis 4 is transmitted to the drive sprocket / or 2, and with them to the driven sprocket 7 via clutch 14 and rusk 15, which is at that moment in one of the radial sockets 13. In this case, if asterisk 2, it will be

leading, since asterisk 1, although it will be

rotate in the same direction, it will not affect the gear ratio. For the change of gear ratio, pedals 5 turn back a little more than half a turn, while the chain b is infinite, and with it the asterisk 2 stops, as the freewheel clutch 10 allows supporting it with an asterisk 9 vras; the side. Axis 4, rotating backward, acts on a curved groove on rusk 15, forcing it to move first along the annular section 12 and then along the inclined section //, shifting it, and with it the coupling 14 in the ocBBOiM direction. Slots 16, leaving the engagement with the grooves b of the sprocket 2, engage with the analogous grooves of the asterisk /. When the pedals are subsequently rotated forward, the cracker 15 slides along (the ring section 12 enters the radial slot 13. The sprocket / becomes the leading one. At the next switching, the process repeats.

Subject invention

A two-stage transmission for a bicycle, containing a leading sprocket on the pedal axis, a driven sprocket on the axle of the rear wheel hub of the bicycle, and an endless chain, characterized in that, to ensure unidirectional movement of the pedals when switching speeds, a second different diagetter sprocket is mounted on the pedal axle, and on the frame of the bicycle there is a supporting sprocket fitted with a free-wheeling clutch, all the asterisks covered by an endless chain forming a double loop,

the leading sprockets are mounted in bearings on the pedal axis, made with inclined and annular sections, passing into radial sockets and forming a curvilinear groove, in which the coupling is movably mounted, made with a cracker moving along the groove, and with sliders interacting with the grooves internal diameters of the leading stars.

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