Gear steps 1-14

Here, we explain in detail the function of the individual gears of the SPEEDHUB. For all who would like to know exactly what is going on.

Our gear unit consists of three in line interconnected planetary gear assemblies #1, #2 and #3. Input is delivered by the sprocket, which is screwed to the driver which connects to gear assembly #1. The planetary gear assemblies #1 and #2 are identical, except that they are laterally reversed, sharing together the planet carrier (1-2). A total of seven gears are produced by these first two assemblies. The further connection of gear assembly #3, which serves as a reduction gear, doubles the gear count to 14. The output drive is delivered from planet carrier #3 to the hub shell via 9 nylon coupling pins located in specially machined pockets.

In all texts and illustrations, parts corresponding to their affiliation with gear assemblies #1, #2 or #3, can be identified by the supplement (1), (2) or (3).

 

We are convinced that technical transparency convinces our customers.

Shifting mechanism

This illustration shows the hub axle with its assembled clutch elements: Clutch ring (1), (2) and (3) together with sun gears 1(1) and 1(2). The middle sun gears 2(1) and 2(2) are not featured to reveal the state of the pawls.

The axle contains the shifting shaft, index mechanism, pawls 1(1), 2(1), 2(2) and 1(3) and the cam tracks for clutch rings 1 and 2. The corresponding sun gears are coupled to the axle by these pawls. The clutch rings shift the planetary gear assemblies (1), (2) or (3) respectively into direct drive (1:1).

Gears #1-7 are shifted with the first revolution of the shifting shaft. Clutch ring 3 shifts gear assembly #3 into its direct-drive gear during the shift from gear #7-8. Gears #8-14 are then shifted with the second revolution of the shifting shaft.

Gear 1

Gear Assy 1
Ring gear (1) is driven by the sprocket. The pawl 1(1) couples the sun gear 1(1) to the axle. The stepped planet gears (1) are driven by the ring gear (1). In doing so, the stepped planet gear's first gear step rolls off the fixed sun 1(1). The result is 0.682 rotations of planet carrier (1-2) for each sprocket rotation.

Gear Assy 2 
(not featured to provide a better overview) Gear assy two (2) is shifted 1:1 and transfers the rotation from gear assy (1) directly to the sun gear (3)

Gear Assy 3
Ring gear (3) is coupled to the axle. The stepped planet gears (3) are driven by sun gear (3). These roll off within the fixed ring gear (3). Therefore, the rotation of the planet carrier (3) is reduced by the factor 0.409.

One sprocket rotation results in:- 0.682 (gear assy 1) x 1 (gear assy 2) x 0.409 (gear assy 3) = 0.279 hub rotations.



Gear 2

Gear Assy 1
Ring gear (1) is driven by the sprocket. The pawl 2(1) couples the sun gear 2(1) to the axle. The stepped planet gears (1) are driven by the ring gear (1). In doing so, the stepped planet gear's second gear step rolls off the fixed sun 2(1). The result is 0.774 rotations of planet carrier (1-2) for each sprocket rotation.

Gear Assy 2
(not featured to provide a better overview) Gear assy two (2) is shifted 1:1 and transfers the rotation from gear assy (1) directly to the sun gear (3)

Gear Assy 3
Ring gear (3) is coupled to the axle. The stepped planet gears (3) are driven by sun gear (3). These roll off within the fixed ring gear (3). Therefore, the rotation of the planet carrier (3) is reduced by the factor 0.409.

One sprocket rotation results in:- 0.774 (gear assy 1) x 1 (gear assy 2) x 0.409 (gear assy 3) = 0.316 hub rotations.

Gear 3

Gear Assy 1
Gear assy one (1) is shifted like 1st gear. One sprocket rotation results in 0.682 planet carrier rotations (1-2).

Gear Assy 2
Gear assy two (2) is shifted like 6th gear. One planet carrier (1-2) rotation results in 1.292  joint ring gear (2) and sun gear (3) rotations .

Gear Assy 3

Ring gear (3) is coupled to the axle. The stepped planet gears (3) are driven by sun gear (3). These roll off within the fixed ring gear (3). Therefore, the rotation of the planet carrier (3) is reduced by the factor 0.409.

One sprocket rotation results in:- 0.682 (gear assy 1) x 1.292 (gear assy 2) x 0.409 (gear assy 3) = 0.360 hub rotations.

Gear 4

Gear Assy 1
(not featured to provide a better overview) Gear assy one (1) is shifted 1:1 and transfers the sprocket rotation direct to the planet carrier (1-2).

Gear Assy 2
(not featured to provide a better overview) Gear assy two (2) is shifted 1:1 and transfers the rotation from gear assy (1) directly to the sun gear (3).

Gear Assy 3

Ring gear (3) is coupled to the axle. The stepped planet gears (3) are driven by sun gear (3). These roll off within the fixed ring gear (3). Therefore, the rotation of the planet carrier (3) is reduced by the factor 0.409.

One sprocket rotation results in:- 1 (gear assy 1) x 1 (gear assy 2) x 0.409 (gear assy 3) = 0.409 hub rotations.

Gear 5

Gear Assy 1
Gear assy one (1) is shifted like 2nd gear. One sprocket rotation results in 0.774 planet carrier rotations (1-2).

Gear Assy 2
Gear assy two (2) is shifted like 7th gear. One planet carrier (1-2) rotation results in 1.467 joint ring gear (2) and sun gear (3) rotations.

Gear Assy 3
Ring gear (3) is coupled to the axle. The stepped planet gears (3) are driven by sun gear (3). These roll off within the fixed ring gear (3). Therefore, the rotation of the planet carrier (3) is reduced by the factor 0.409.

One sprocket rotation results in:- 0.774 (gear assy 1) x 1.467 (gear assy 2) x 0.409 (gear assy 3) = 0.464 hub rotations.

Gear 6

Gear Assy 1
(not featured to provide a better overview) Gear assy one (1) is shifted 1:1 and transfers the sprocket rotation direct to the planet carrier (1-2).

Gear Assy 2
Pawl 2(2) couples sun gear 2(2) directly to the axle. The planet carrier (1-2) drives the stepped planet gears (2). With the second gear step the stepped planet gears (2) roll off the fixed sun gear 2(2). Thus one planet carrier (1-2) rotation results in 1.292 rotations of the joint ring gear (2) and sun gear (3).

Gear Assy 3
Ring gear (3) is coupled to the axle. The stepped planet gears (3) are driven by sun gear (3). These roll off, within the fixed ring gear (3). Therefore, the rotation of the planet carrier (3) is reduced by the factor 0.409.

One sprocket rotation results in:- 1 (gear assy 1) x 1.292 (gear assy 2) x 0.409 (gear assy 3) = 0.528 hub rotations.

Gear 7

Gear Assy 1 
(not featured to provide a better overview) Gear assy one (1) is shifted 1:1 and transfers the sprocket rotation direct to the planet carrier (1-2).

Gear Assy 2
Pawl 1(2) couples sun gear 1(2) directly to the axle. The planet carrier (1-2) drives the stepped planet gears (2). With the second gear step the stepped planet gears (2) roll off the fixed sun gear 1(2). Thus one planet carrier (1-2) rotation results in 1.467 rotations of the joint ring gear (2) and sun gear (3).

Gear Assy 3
Ring gear (3) is coupled to the axle. The stepped planet gears (3) are driven by sun gear (3). These roll off, within the fixed ring gear (3). Therefore, the rotation of the planet carrier (3) is reduced by the factor 0.409.

One sprocket rotation results in:- 1 (gear assy 1) x 1.467 (gear assy 2) x 0.409 (gear assy 3) = 0.600 hub rotations.

Gear 8

Gear Assy 1 
Ring gear (1) is driven by the sprocket. The pawl 1(1) couples the sun gear 1(1) to the axle. The stepped planet gears (1) are driven by the ring gear (1). In doing so, the stepped planet gear's first gear step rolls off the fixed sun 1(1). The result is 0.682 rotations of planet carrier (1-2) for each sprocket rotation.

Gear Assy 2 

(not featured to provide a better overview) Gear assy two (2) is shifted 1:1 and transfers the rotation from gear assy (1) direct to the sun gear (3)

Gear Assy 3
Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).

One sprocket rotation results in:- 0.682 (gear assy 1) x 1 (gear assy 2) x 1 (gear assy 3) = 0.682 hub rotations.

Gear 9

Gear Assy 1
Ring gear (1) is driven by the sprocket. The pawl 2(1) couples the sun gear 2(1) to the axle. The stepped planet gears (1) are driven by the ring gear (1). In doing so, the stepped planet gear's second gear step rolls off the fixed sun 2(1). The result is 0.774 rotations of planet carrier (1-2) for each sprocket rotation.

Gear Assy 2 

(not featured to provide a better overview) Gear assy two (2) is shifted 1:1 and transfers the rotation from gear assy (1) direct to the sun gear (3)

Gear Assy 3

Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).

One sprocket rotation results in:- 0.774 (gear assy 1) x 1 (gear assy 2) x 1 (gear assy 3) = 0.774 hub rotations.

Gear 10

Gear Assy 1
Gear assy one (1) is shifted like 1st gear. One sprocket rotation results in 0.682 planet carrier rotations (1-2).

Gear Assy 2
Gear assy two (2) is shifted like 6th gear. One planet carrier (1-2) rotation results in 1.292 joint ring gear (2) and sun gear (3) rotations .

Gear Assy 3
Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).

One sprocket rotation results in:- 0.682 (gear assy 1) x 1.292 (gear assy 2) x 1 (gear assy 3) = 0.881 hub rotations.

Gear 11

Gear Assy 1 
(not featured to provide a better overview) Gear assy one (1) is shifted 1:1 and transfers the sprocket rotation direct to the planet carrier (1-2).

Gear Assy 2 
(not featured to provide a better overview) Gear assy two (2) is shifted 1:1 and transfers the rotation from gear assy (1) direct to the sun gear (3).

Gear Assy 3
Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).

One sprocket rotation results in:- 1 (Gear Assy 1) x 1 (Gear Assy 2) x 1 (Gear Assy 3) = 1.000 hub rotations.

Gear 12

Gear Assy 1
Gear assy one (1) is shifted like 2nd gear. One sprocket rotation results in 0.774 planet carrier rotations (1-2).

Gear Assy 2
Gear assy two (2) is shifted like 7th gear. One planet carrier (1-2) rotation results in 1.467 joint ring gear (2) and sun gear (3) rotations .

Gear Assy 3
Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).

One sprocket rotation results in:- 0.774 (Gear Assy 1) x 1.467 (Gear Assy 2) x 1 (Gear Assy 3) = 1.135 hub rotations.

Gear 13

Gear Assy 1  
(not featured to provide a better overview) Gear assy one (1) is shifted 1:1 and transfers the sprocket rotation direct to the planet carrier (1-2).

Gear Assy 2
Pawl 2(2) couples sun gear 2(2) directly to the axle. The planet carrier (1-2) drives the stepped planet gears (2). With the second gear step the stepped planet gears (2) roll off the fixed sun gear 2(2). Thus one planet carrier (1-2) rotation results in 1.292 rotations of the joint ring gear (2) and sun gear (3).

Gear Assy 3

Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).

One sprocket rotation results in:- 1 (Gear Assy 1) x 1.292 (Gear Assy 2) x 1 (Gear Assy 3) = 1.292 hub rotations.

Gear 14

Gear Assy 1 
(not featured to provide a better overview) Gear assy one (1) is shifted 1:1 and transfers the sprocket rotation direct to the planet carrier (1-2).

Gear Assy 2
Pawl 1(2) couples sun gear 1(2) directly to the axle. The planet carrier (1-2) drives the stepped planet gears (2). With the second gear step the stepped planet gears (2) roll off the fixed sun gear 1(2). Thus one planet carrier (1-2) rotation results in 1.467 rotations of the joint ring gear (2) and sun gear (3).

Gear Assy 3

Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).

One sprocket rotation results in:- 1 (Gear Assy 1) x 1.467 (Gear Assy 2) x 1 (Gear Assy 3) = 1.467 hub rotations.