CN2246621Y - Front-rear pedaling double-speed transmission - Google Patents

Abstract

The utility model relates to a front-rear pedaling double-speed transmission mechanism for a bicycle, of which a front pedaling goes forward or a rear pedaling also goes forward, and the front pedaling goes forward or the rear pedaling goes back. A freewheel of the traditional bicycle is removed by the utility model. A driven chain wheel 2 is arranged and fixed on a shaft skin 1. A driving chain wheel of a central shaft 5 is a planetary wheel mechanism. A driving gear wheel 6 is fixed to the central shaft 5. A transitional gear wheel 7 is arranged on an arm rotating disc 12. The external hem of a driven internal gear wheel 8 is a chain wheel. The purposes of variable-speed drive in which the integration of the planetary wheel mechanism of the front pedaling is rotated forward as the rear pedaling is separately rotated forward and the front pedaling is driven first or the rear pedaling is driven later are realized by restricting the autorotation of the transition gear wheel 7 and restricting or relieving the rotation of the arm rotating disc 12.

Description

Front and back are stepped on and are changed double speed front and back row transmission device

The utility model is a kind of bicycle drive, and especially the bicycle front and back of being made up of drive sprocket, chain and driven sprocket are stepped on and changed double speed front and back row transmission device.

The bicycle of Chu Shouing is exactly this structure in the market, mainly is made up of drive sprocket, chain and driven sprocket (being flywheel).The single speed bicycle only is each one of drive sprocket and a driven sprocket; Variable speed bicycle then is that the drive sprocket and the driven sprocket of the different numbers of teeth is a plurality of, and the transmission by the driving and driven sprocket wheel of the different numbers of teeth of chain device conversion is dialled in operation obtains different transmitting ratios, reaches the purpose of speed change.When people advance by bike, stepping on the commentaries on classics pedal forward rotates drive sprocket forward, drive driven sprocket by chain and rotate, drive to advance: when people get on and off or do not step on when changeing pedal and sliding, driven sprocket (being flywheel) is finished the neutral that the moving and drive sprocket of car, chain do not rotate and is rotated.But at axis pedal position, change two actions of pedal, also have a action not to be used to post legged commentaries on classics pedal except having to step on forward to change with not stepping on.Therefore, general bicycle chain wheel drive mechanism has just slatterned the This move resource of " changeing pedal to post legged " in the bicycle chain wheel drive mechanism in vain.

The purpose of this utility model provides a kind of front and back and steps on transformation double speed front and back row transmission device, it used step on forward change change before pedal drives drive sprocket drive to advance and do not step on change pedal and have neutral and rotate two actions after, also used easily to post legged and changeed the pedal This move, can drive to retreat, also can drive to advance with another speed.

The purpose of this utility model is achieved in that in the ordinary bicycle chain wheel driving mechanism, changes flywheel and is fixed on the skin for the chip driven sprocket.Drive sprocket is a planetary wheeling mechanism, and wherein driving gear is fixed on the axis, and excessively gear is installed on the pivoted arm disk of axis rotation, and the outward flange of driven inner gear is a sprocket wheel.With the unidirectional rotation of a secondary ratchet, pawl structures limit excessive gear, limit or remove the unidirectional rotation of pivoted arm disk again with a secondary ratchet, pawl structures, i.e. the excessively unidirectional revolution of gear.When stepping on forward when changeing pedal and advancing by bike, the unidirectional rotation of ratchet, pawl structures limit excessive gear, promptly excessively gear can not rotation, can revolve round the sun around axis, make to change before the planetary wheeling mechanism integral body and drive to advance with a speed; When post legged commentaries on classics pedal advances by bike, install to rotate behind the pivoted arm disk of excessive gear and be subjected to ratchet, ratchet restriction, be the rotation of excessive gear energy, cannot revolve round the sun that transmission between planetary wheeling mechanism three gears makes still preceding commentaries on classics of driven inner gear drive to advance with another speed around axis; When not stepping on when changeing pedal and sliding, the free transmission of planetary wheeling mechanism, it is moving and neutral that driven sprocket and chain rotate is thereupon rotated to finish car: change that pedal advances by bike or when retreating when stepping on forward or backward, the excessively rotation of gear in the omnirange restriction planetary wheeling mechanism, remove the unidirectional rotation of ratchet, pawl structures restriction pivoted arm disk, planetary wheeling mechanism integral body is rotated forward or backward, thereby drive to advance or retreat.

Because in the above-mentioned solution, make drive sprocket with planetary wheeling mechanism, driven sprocket is not again traditional flywheel, but the chip sprocket wheel directly is fixed on the skin, can step on forward very easily and change pedal with a fast before driving or do not do any operation and change pedal with another fast before driving to post legged; Can also step on forward or backward changes the amusement that pedal advances by bike or retreats.Step on before and after this and change row transmission device before and after the double speed, integral layout is reasonable, installs, Operation and maintenance are easy, has that speed change is simple, two speed ratio differences are big, health care, tap intellectual resources and a multiple function of amusement.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is an embodiment integral structure cutaway view.

Fig. 2 is the A-A cutaway view of Fig. 1.

In Fig. 1, Fig. 2, driven sprocket 2 is captiveed joint with an axle skin 1, finishes the transmission of driven sprocket 2 and drive sprocket with chain 3, and drive sprocket is made up of planetary wheeling mechanism.The outward flange of driven inner gear 8 is sprocket wheels, and constitute S. A. with driven inner gear 8 running-fits with three axis of rolling 4, excessively gear 7 and ratchet 13 usefulness axle 9 is installed on the pivoted arm disk 12, driving gear 6 is fixed on the axis 5, pivoted arm disk 12 and ratchet 16 usefulness bearings 15 are installed on the axis 5, and axis 5 is connected with crank, pedal.Ratchet 10 and spring 11 are installed on the pivoted arm disk 12, and with the unidirectional rotation of ratchet 13 limit excessive gears 7.Be installed in ratchet 17 on the car body 18 can be adjusted to be fixed on pivoted arm disk 12 on ratchet 16 cooperate or mismatch, play restriction or remove the unidirectional rotation effect of pivoted arm disk 12.When stepping on forward when changeing pedal and advancing by bike, rotate before the driving gear 6, ratchet 10, ratchet 13 has limited the rotation of the excessive gear 7 of this direction, change before the planetary wheeling mechanism integral body, and ratchet 17, ratchet 16 does not rotate before not limiting pivoted arm disk 12, so, rotate before the driven inner gear 8 and drive to advance: when when post legged commentaries on classics pedal advances by bike with a speed, driving gear 6 rotates backward, ratchet 10, ratchet 13 does not limit the rotation of the excessive gear 7 of this direction, transmission between three gears in the planetary wheeling mechanism, and ratchet 17, ratchet 16 restriction pivoted arm disks 12 rotate backward, driven inner gear 8 rotates before still and drives to advance with another speed: when not stepping on when changeing pedal and sliding, driving gear 6 does not rotate, driven inner gear 8, pivoted arm disk 12 and excessively gear 7 neutral of doing free transmission rotate: change that pedal advances by bike or when retreating when stepping on forward or backward, omnidirectional's rotation with the excessive gear 7 of screw 14 pinnings, and remove cooperating of ratchet 17 and ratchet 16, make the pivoted arm disk 12 can two-way rotation, driven inner gear 8 be followed to rotate before the pedal and is driven to advance or the back is rotated and driven to retreat.

Claims (1)

1. front and back of being made up of drive sprocket, chain and driven sprocket are stepped on and are changed double speed front and back row transmission device, it is characterized in that: its driven sprocket 2 directly is fixed on the skin 1, its drive sprocket is made up of the planetary wheeling mechanism of driving gear 6, excessive gear 7 and driven inner gear 8, driving gear 6 is fixed on the axis 5, excessively gear 7 and ratchet 10 are installed on the pivoted arm disk 12, the outward flange of driven inner gear 8 is sprocket wheels, the unidirectional rotation of ratchet 10 limit excessive gears 7, ratchet 17 can limit or the lift restrictions unidirectional rotation of pivoted arm disk 12.

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