Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
  • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
  • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
  • B62M11/145—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears built in, or adjacent to, the bottom bracket

Definitions

• planetary gearboxes as known from the patent descriptions JP 62099293 and US 4854191, which are using unidirectional clutches that are locking-up rotary motion of sun gears in relation to the frame in one direction. Gearing down in these gearboxes takes place by unlocking of unidirectional clutch of higher speed, thereby the lower speed becomes operational automatically. Gearing up takes place by locking-up unidirectional clutch of the higher speed, and without releasing of the lock-up of unidirectional clutch of the lower speed, in the middle of changing the speeds, no other speed is used for maintaining the continuity of gearbox operation.
• planetary gearbox contains elements blocking rotary motion in relation to frame.
• planetary gearbox contains the gear of the follower that is rigidly connected with chainring, in particular that which surrounds it.
• the transmission ratio amounts to 206%.
• Obtaining the high value of transmission ratios for the highest speeds is possible owing to the installation of satellite gears in a way preventing their rotation in relation to each other, in a form of a block - this allows for additional increase of the amount of transmission ratio when transferring the torque from satellite gears with smaller diameter onto the satellite gears with larger diameter, which results in a higher peripheral speed at the same rotational speed, in the solutions, where the satellite gears are mounted rotationally in relation to each other and the whole gearbox is a group of a few separate planetary mechanisms, the span between tne lowest ana nignest speed is lower.
• fig. 1 depicts the example I of the embodiment according to invention - cross-section of three speed gearbox
• fig. 2 shows the example I of the embodiment according to invention - external view of the gearbox mounted on a frame
• fig. 3 depicts example I of embodiment - cross-section of the gearbox in axonometric projection
• fig. 4 shows example I of the embodiment according to invention - axonometric projection showing sun gears and mating centrifugal interlocks of the clutches, satellite gears and follower gear
• fig. 1 depicts the example I of the embodiment according to invention - cross-section of three speed gearbox
• fig. 2 shows the example I of the embodiment according to invention - external view of the gearbox mounted on a frame
• fig. 3 depicts example I of embodiment - cross-section of the gearbox in axonometric projection
• fig. 4 shows example I of the embodiment according to invention - axonometric projection showing sun gears and mating centrifugal
• Bicycle planetary gearbox with three speeds, located on the right side of bicycle frame BB shell, transferring the driving force as imparted by human muscles from the pedal cranks onto the front chainring of bicycle.
• the unidirectional clutch 17 as shown in fig. 6 is rigidly connected by means of its base 17a to the pedal cranks axle 12 of the crank mechanism 8.
• the unidirectional clutch 17 is rigidly connected by its external part 17b with the chainring 16.
• External part 17b is mounted in a way enabling this chainring 16 a higher rotational speed than rotational speed of the crank mechanism 8, at the sense of rotation of pedal crank 13 in the course of propelling the bicycle when riding forward. Mating of the base 17a and external part 17b of unidirectional clutch 17 is ensured by the pawls 17c, girded with springs 17d.
• the two-way positive clutch 20 consisting of centrifugal interlocks 201 and pulling springs 202, which is mating with control element 22, is mounted on the element 18 rigidly connected with frame 10.
• the elements 19 blocking rotary motion in relation to frame 10 make up the point of support for centrifugal interlocks 201 in the course, when they are blocking rotational movement of large sun gear 1.
• the clutch 21, mounted on element 18 rigidly connected with frame 10, features the structure that is analogous to the structure of clutch 20, and consists of centrifugal interlocks 211, pulling springs 212 and is also mating with control element 22.
• Clutch 21 is adopted for mating with the small sun gear 2.
• the control element 22 is rotationally mounted in relation to element i « rigidly connected with frame 10, connected with this element by means of spring 23 and rotated by pulling or releasing of control cord 24.
• Fig. 9a, 9b and 9c are illustrating the process of changing the speed from 2 to 3, in the course of which the gearbox is operating also on the speed 1 neutral.
• the four speed planetary gearbox for bicycles transmitting the driving force as imparted by human muscles from the pedal cranks onto the front chainring of the bicycle.
• fig. 14a- 14c Operation of the planetary gearbox in the first example of embodiment is shown in fig. 14a- 14c, which is illustrating the process of shifting between the higher speeds, from speed 3 to 4, in the course of which the gearbox is also working with the speed 1 neutral.
• the five speed planetary gearbox for bicycles is situated on the right side of BB shell of the bicycle frame, transmitting the driving force as imparted by human muscles from the pedal cranks onto the front chainring of the bicycle.
• the planetary gearbox is fitted with the crank mechanism 8, consisting of pedal cranks axle 12, pedal cranks 13 as well as yoke 7, whilst the yoke 7 is rigidly connected with pedal crank 13.
• the axles 44 of satellite gears are rigidly mounted in the yoke 7.
• the gearbox contains unidirectional clutch 45, rigidly mounted by its base 45a on the axles 44 of satellite gears.
• the external part 45b of unidirectional clutch 45 is rigidly connected with the gear 6 of the follower, which is adopted for mating with the medium satellite gears 27.
• the satellite gears 4, 27, 3 are mating with sun gears 1, 26, 2, that are mating with bidirectional clutches 39, 40, 42.
• Gear 6 of the follower is rigidly connected with the chainring 46, adapted for mating with transmission belt.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Structure Of Transmissions (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=48856908

Family Applications (1)

Country Status (2)

Cited By (5)

Citations (4)

• 2012
  • 2012-06-20 PL PL399591A patent/PL221732B1/pl unknown
• 2013
  • 2013-06-15 WO PCT/PL2013/000081 patent/WO2013191572A1/fr not_active Ceased

Patent Citations (5)

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