Planet-type multi-stage transmission for a bicycle or pedelec

11261,943

17/058846

April 29, 2019

A multi-stage planetary transmission for a bicycle or a pedelec includes a transmission input shaft (1), a transmission output shaft (2), and at least three planetary gear sets (VRS, VR1, VR2, RS1, RS2, NRS, NR1, NR2). A first planetary gear set (RS1) and a second planetary gear set (RS2) are configured as a main gear set and at least one further planetary gear set (VRS, VR1, VR2, NRS, NR1, NR2) is configured as a front-mounted gear set and/or as a rear-mounted gear set. At least three free-wheel clutches (F1, F2, F3, F4) and at least three brakes (B1, B2, B3, B4) are provided for implementing at least eight gears (G1, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, G12, G13, G14, G15, G16). Moreover, the multi-stage transmission may be a bottom bracket transmission. In addition, a bicycle or pedelec with the multi-stage transmission is proposed.

ZF Friedrichshafen AG (Friedrichshafen, DE)

ZF FRIEDRICHSHAFEN AG (Friedrichshafen, DE)

1. A planetary multi-stage transmission for a bicycle or a pedelec, comprising: a transmission input shaft (1); a transmission output shaft (2); at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2); and at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4) and at least three brakes (B 1 , B 2 , B 3 , B 4) configured for implementing at least eight gears (G 1 , G 2 , G 3 , G 4 , G 5 , G 6 , G 7 , G 8 , G 9 , G 10 , G 11 , G 12 , G 13 , G 14 , G 15 , G 16), wherein a first planetary gear set (RS 1) and a second planetary gear set (RS 2) of the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are configured as a main shift gear set and at least one further planetary gear set (VRS, VR 1 , VR 2 , NRS, NR 1 , NR 2) of the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) is configured as a front-mounted gear set and/or as a rear-mounted gear set, wherein a planet carrier (5) of the first planetary gear set (RS 1) is connected to a sun gear (7) of the second planetary gear set (RS 2), wherein a ring gear (6) of the first planetary gear set (RS 1) is fixable via a second brake (B 2) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to a planet carrier (8) of the second planetary gear set (RS 2) or to a ring gear (9) of the second planetary gear set (RS 2) via a second free-wheel clutch (F 2) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4), wherein the planet carrier (8) of the second planetary gear set (RS 2) is connected to the transmission input shaft (1) or to a gear set element as an output of the front-mounted gear set (VR 1 , VRS), wherein the ring gear (9) of the second planetary gear set (RS 2) is connected to the transmission output shaft (2) or to a gear set element as an input of the rear-mounted gear set (NRS, NR 1), and wherein either a sun gear (4) of the first planetary gear set (RS 1) is fixable via a first brake (B 1) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to the planet carrier (8) of the second planetary gear set (RS 2) or to the ring gear (9) of the second planetary gear set (RS 2) via a first free-wheel clutch (F 1) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4), or the sun gear (4) of the first planetary gear set (RS 1) is connected to the planet carrier (8) of the second planetary gear set (RS 2) or to the ring gear (9) of the second planetary gear set (RS 2).

2. The multi-stage transmission of claim 1 , wherein: one or more of the front-mounted gear sets (VRS, VR 1 , VR 2) and the rear-mounted gear sets (NRS, NR 1 , NR 2) is configured as a minus gear set; a first gear set element of each minus gear set is configured as an input and is a planet carrier (11 , 14 , 17 , 20 , 23 , 26); a second gear set element of each minus gear set is configured as an output and is one of a sun gear (10 , 13 , 16 , 19 , 22 , 25) and a ring gear (12 , 15 , 18 , 21 , 24 , 27); and a third gear set element of each minus gear set is fixable via a third brake (B 3) or a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is the other of the ring gear (12 , 15 , 18 , 21 , 24 , 27) and the sun gear (10 , 13 , 16 , 19 , 22 , 25).

3. The multi-stage transmission of claim 1 , wherein: one or more of the front-mounted gear sets (VRS, VR 1 , VR 2) and the rear-mounted gear sets (NRS, NR 1 , NR 2) is configured as a plus gear set; a first gear set element of each plus gear set is configured as an input and is ring gear (12 , 15 , 18 , 21 , 24 , 27); a second gear set element of each plus gear set is configured as an output and is one of a sun gear (10 , 13 , 16 , 19 , 22 , 25) and a planet carrier (11 , 14 , 17 , 20 , 23 , 26); and a third gear set element of each plus gear set is fixable via a third brake (B 3) or a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is the other of the sun gear (10 , 13 , 16 , 19 , 22 , 25) and the planet carrier (11 , 14 , 17 , 20 , 23 , 26).

4. The multi-stage transmission of claim 1 , wherein each of the at least three brakes (B 1 , B 2 , B 3 , B 4) is a respective free-wheel brake.

5. The multi-stage transmission of claim 1 , further comprising at least one electric machine (EM) operable to drive rotation of the transmission output shaft (2).

6. The multi-stage transmission of claim 5 , wherein the transmission input shaft (1) is connectable via a zeroth free-wheel clutch (F 0) to the electric machine (EM).

7. The multi-stage transmission of claim 1 , wherein: the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are arranged in an axial sequence of the front-mounted gear set (VRS), the second planetary gear set (RS 2), the first planetary gear set (RS 1), and the rear-mounted gear set (NRS); and each of the front-mounted gear set (VRS), the second planetary gear set (RS 2), the first planetary gear set (RS 1), and the rear-mounted gear set (NRS) is configured as a respective minus planetary gear set.

8. The multi-stage transmission of claim 7 , wherein: the transmission input shaft (1) is connected to a planet carrier (11) of the front-mounted gear set (VRS); a sun gear (10) of the front-mounted gear set (VRS) is fixable via a third brake (B 3) of the at least three brakes (B 1 , B 2 , B 3 , B 4), is connectable to a ring gear (12) of the front-mounted gear set (VRS) as well as to the planet carrier (8) of the second planetary gear set (RS 2) via a third free-wheel clutch (F 3) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4), and is connectable to the ring gear (6) of the first planetary gear set (RS 1) via the second free-wheel clutch (F 2); the ring gear (9) of the second planetary gear set (RS 2) is connected to a planet carrier (26) of the rear-mounted gear set (NRS) and is connectable to the sun gear (4) of the first planetary gear set (RS 1) via the first free-wheel clutch (F 1); the sun gear (7) of the second planetary gear set (RS 2) is connected to the planet carrier (5) of the first planetary gear set (RS 1); a ring gear (27) of the rear-mounted gear set (NRS) is fixable via a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to the transmission output shaft (2) via a fourth free-wheel clutch (F 4) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); and a sun gear (25) of the rear-mounted gear set (NRS) is connected to the transmission output shaft (2).

9. The multi-stage transmission of claim 1 , wherein: the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are arranged in an axial sequence of a second front-mounted gear set (VR 2), a first front-mounted gear set (VR 1), the second planetary gear set (RS 2), and the first planetary gear set (RS 1); and each of the second front-mounted gear set (VR 2), the first front-mounted gear set (VR 1), the second planetary gear set (RS 2), and the first planetary gear set (RS 1) is configured as a respective minus planetary gear set.

10. The multi-stage transmission of claim 9 , wherein: the transmission input shaft (1) is connected to a planet carrier (17) of the second front-mounted gear set (VR 2); a ring gear (18) of the second front-mounted gear set (VR 2) is fixable via a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4); a sun gear (16) of the second front-mounted gear set (VR 2) is connected to a planet carrier (14) of the first front-mounted gear set (VR 1) and is connectable to the ring gear (18) of the second front-mounted gear set (VR 2) via a fourth free-wheel clutch (F 4) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); a sun gear (13) of the first front-mounted gear set (VR 1) is fixable via a third brake (B 3) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to the planet carrier (14) of the first front-mounted gear set (VR 1) via a third free-wheel clutch (F 3) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); a ring gear (15) of the first front-mounted gear set (VR 1) is connected to the planet carrier (8) of the second planetary gear set (RS 2) and is connectable to the ring gear (6) of the first planetary gear set (RS 1) via the second free-wheel clutch (F 2); the sun gear (7) of the second planetary gear set (RS 2) is connected to the planet carrier (5) of the first planetary gear set (RS 1); and the ring gear (9) of the second planetary gear set (RS 2) is connected to the transmission output shaft (2) and is connectable to the sun gear (4) of the first planetary gear set (RS 1) via the first free-wheel clutch (F 1).

11. The multi-stage transmission of claim 1 , wherein: the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are arranged in an axial sequence of the first planetary gear set (RS 1), the second planetary gear set (RS 2), a first rear-mounted gear set (NR 1), and a second rear-mounted gear set (NR 2); and each of the first planetary gear set (RS 1), the second planetary gear set (RS 2), the first rear-mounted gear set (NR 1), and the second rear-mounted gear set (NR 2) is configured as a respective minus planetary gear set.

12. The multi-stage transmission of claim 11 , wherein: the transmission input shaft (1) is connected to the planet carrier (8) of the second planetary gear set (RS 2); the sun gear (7) of the second planetary gear set (RS 2) is connected to the planet carrier (5) of the first planetary gear set (RS 1); the ring gear (9) of the second planetary gear set (RS 2) is connected to a planet carrier (20) of the first rear-mounted gear set (NR 1) and is connectable to the ring gear (6) of the first planetary gear set (RS 1) via the second free-wheel clutch (F 2); the ring gear (6) of the first planetary gear set (RS 1) is fixable via the second brake (B 2); the sun gear (4) of the first planetary gear set (RS 1) is fixable via the first brake (B 1) and is connectable to the transmission input shaft (1) via the first free-wheel clutch (F 1); a sun gear (19) of the first rear-mounted gear set (NR 1) is fixable via a third brake (B 3) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to a ring gear (21) of the first rear-mounted gear set (NR 1) via a third free-wheel clutch (F 3) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); the ring gear (21) of the first rear-mounted gear set (NR 1) is connected to a planet carrier (23) of the second rear-mounted gear set (NR 2); a sun gear (22) of the second rear-mounted gear set (NR 2) is connected to the transmission output shaft (2) and is connectable to a ring gear (24) of the second rear-mounted gear set (NR 2) via a fourth free-wheel clutch (F 4) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); and the ring gear (24) of the second rear-mounted gear set (NR 2) is fixable via a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4).

13. The multi-stage transmission of claim 1 , wherein: the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are arranged in an axial sequence of a second front-mounted gear set (VR 2), a first front-mounted gear set (VR 1), the second planetary gear set (RS 2), and the first planetary gear set (RS 1); each of the second front-mounted gear set (VR 2) and the second planetary gear set (RS 2) comprises a respective stepped planet; and each of the second front-mounted gear set (VR 2), the first front-mounted gear set (VR 1), the second planetary gear set (RS 2), and the first planetary gear set (RS 1) is configured as a respective minus planetary gear set.

14. The multi-stage transmission of claim 13 , wherein: the transmission input shaft (1) is connected to a planet carrier (17) of the second front-mounted gear set (VR 2) and is connectable to a ring gear (18) of the second front-mounted gear set (VR 2) via a fourth free-wheel clutch (F 4) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); a sun gear (16) of the second front-mounted gear set (VR 2) is fixable via a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4); the ring gear (18) of the second front-mounted gear set (VR 2) is connected to a planet carrier (14) of the first front-mounted gear set (VR 1) and is connectable to a ring gear (15) of the first front-mounted gear set (VR 1) via a third free-wheel clutch (F 3) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); a sun gear (13) of the first front-mounted gear set (VR 1) is fixable via a third brake (B 3) of the at least three brakes (B 1 , B 2 , B 3 , B 4); the ring gear (15) of the first front-mounted gear set (VR 1) is connected to the planet carrier (8) of the second planetary gear set (RS 2) and is connectable to the ring gear (6) of the first planetary gear set (RS 1) via the second free-wheel clutch (F 2); the ring gear (9) of the second planetary gear set (RS 2) is connected to the transmission output shaft (2) and is connectable to the sun gear (4) of the first planetary gear set (RS 1) via the first free-wheel clutch (F 1); and the sun gear (7) of the second planetary gear set (RS 2) is connected to the planet carrier (5) of the first planetary gear set (RS 1).

15. The multi-stage transmission of claim 1 , wherein: the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are arranged in an axial sequence of a second front-mounted gear set (VR 2), a first front-mounted gear set (VR 1), the second planetary gear set (RS 2), and the first planetary gear set (RS 1); each of the second front-mounted gear set (VR 2) and the first front-mounted gear set (VR 1) is configured as a respective plus planetary gear set; and each of the second planetary gear set (RS 2) and the first planetary gear set (RS 1) is configured as a respective minus planetary gear set.

16. The multi-stage transmission of claim 15 , wherein: the transmission input shaft (1) is connected to a ring gear (18) of the second front-mounted gear set (VR 2); a sun gear (16) of the second front-mounted gear set (VR 2) is fixable via a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to a planet carrier (17) of the second front-mounted gear set (VR 2) via a fourth free-wheel clutch (F 4) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); the planet carrier (17) of the second front-mounted gear set (VR 2) is connected to a ring gear (15) of the first front-mounted gear set (VR 1); the ring gear (15) of the first front-mounted gear set (VR 1) is connectable to a planet carrier (14) of the first front-mounted gear set (VR 1) via a third free-wheel clutch (F 3) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); a sun gear (13) of the first front-mounted gear set (VR 1) is fixable via a third brake (B 3) of the at least three brakes (B 1 , B 2 , B 3 , B 4); the planet carrier (14) of the first front-mounted gear set (VR 1) is connected to the planet carrier (8) of the second planetary gear set (RS 2) and is connectable to the ring gear (6) of the first planetary gear set (RS 1) via the second free-wheel clutch (F 2); and the ring gear (9) of the second planetary gear set (RS 2) is connected to the transmission output shaft (2) and is connectable to the sun gear (4) of the first planetary gear set (RS 1) via the first free-wheel clutch (F 1).

17. The multi-stage transmission of claim 1 , wherein: the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4) comprises the first free-wheel clutch (F 1), the second free-wheel clutch (F 2), a third free-wheel clutch (F 3), and a fourth free-wheel clutch (F 4); and the at least three brakes (B 1 , B 2 , B 3 , B 4) comprises the first brake (B 1), the second brake (B 2), a third brake (B 3), and a fourth brake (B 4); and in order to shift a first gear (G 1), the first, the second, the third, and the fourth brakes (B 1 , B 2 , B 3 , B 4) are disengaged, and the first, the second, the third, and the fourth free-wheel clutches (F 1 , F 2 , F 3 , F 4) are in a locking direction condition; or in order to shift a second gear (G 2), the first brake (B 1) is engaged, the second, the third, and the fourth brakes (B 2 , B 3 , B 4) are disengaged, the first free-wheel clutch (F 1) is in an overrun operation condition, and the second, the third, and the fourth free-wheel clutches (F 2 , F 3 , F 4) are in the locking direction condition; or in order to shift a third gear (G 3), the second brake (B 2) is engaged, the first, the third, and the fourth brakes (B 1 , B 3 , B 4) are disengaged, the second free-wheel clutch (F 2) is in the overrun operation condition, and the first, the third, and the fourth free-wheel clutches (F 1 , F 3 , F 4) are in the locking direction condition; or in order to shift a fourth gear (G 4), the first and the second brakes (B 1 , B 2) are engaged, the third and the fourth brakes (B 3 , B 4) are disengaged, the first and the second free-wheel clutches (F 1 , F 2) are in the overrun operation condition, and the third and the fourth free-wheel clutches (F 3 , F 4) are in the locking direction condition; or in order to shift a fifth gear (G 5), the third brake (B 3) is engaged, the first, the second, and the fourth brakes (B 1 , B 2 , B 4) are disengaged, the first, the second, and the fourth free-wheel clutches (F 1 , F 2 , F 4) are in the locking direction condition, and the third free-wheel clutch (F 3) is in the overrun operation condition; or in order to shift a sixth gear (G 6), the first and the third brakes (B 1 , B 3) are engaged, the second and the fourth brakes (B 2 , B 4) are disengaged, the first and the third free-wheel clutches (F 1 , F 3) are in the overrun operation condition, and the second and the fourth free-wheel clutches (F 2 , F 4) are in the locking direction condition; or in order to shift a seventh gear (G 7), the first and the fourth brakes (B 1 , B 4) are disengaged, the second and the third brakes (B 2 , B 3) are engaged, the first and the fourth free-wheel clutches (F 1 , F 4) are in the locking direction condition, and the second and the third free-wheel clutches (F 2 , F 3) are in the overrun operation condition; or in order to shift an eighth gear (G 8), the first, the second, and the third brakes (B 1 , B 2 , B 3) are engaged, the fourth brake (B 4) is disengaged, the first, the second, and the third free-wheel clutches (F 1 , F 2 , F 3) are in the overrun operation condition, and the fourth free-wheel clutch (F 4) is in the locking direction condition; or in order to shift a ninth gear (G 9), the first, the second, and the third brakes (B 1 , B 2 , B 3) are disengaged, the fourth brake (B 4) is engaged, the first, the second, and the third free-wheel clutches (F 1 , F 2 , F 3) are in the locking direction condition, and the fourth free-wheel clutch (F 4) is in the overrun operation condition; or in order to shift a tenth gear (G 10), the first and the fourth brakes (B 1 , B 4) are engaged, the second and the third brakes (B 2 , B 3) are disengaged, the first and the fourth free-wheel clutches (F 1 , F 4) are in the overrun operation condition, and the second and the third free-wheel clutches (F 2 , F 3) are in the locking direction condition; or in order to shift an eleventh gear (G 11), the first and the third brakes (B 1 , B 3) are disengaged, the second and the fourth brakes (B 2 , B 4) are engaged, the first and the third free-wheel clutches (F 1 , F 3) are in the locking direction condition, and the second and the fourth free-wheel clutches (F 2 , F 4) are in the overrun operation condition; or in order to shift a twelfth gear (G 12), the first, the second, and the fourth brakes (B 1 , B 2 , B 4) are engaged, the third brake (B 3) is disengaged, the first, the second, and the fourth free-wheel clutches (F 1 , F 2 , F 4) are in the overrun operation condition, and the third free-wheel clutch (F 3) is in the locking direction condition; or in order to shift a thirteenth gear (G 13), the first and the second brakes (B 1 , B 2) are disengaged, the third and the fourth brakes (B 3 , B 4) are engaged, the first and the second free-wheel clutches (F 1 , F 2) are in the locking direction condition, and the third and the fourth free-wheel clutches (F 3 , F 4) are in the overrun operation condition; or in order to shift a fourteenth gear (G 14), the first, the third, and the fourth brakes (B 1 , B 3 , B 4) are engaged, the second brake (B 2) is disengaged, the first, the third, and the fourth free-wheel clutches (F 1 , F 3 , F 4) are in the overrun operation condition, and the second free-wheel clutch (F 2) is in the locking direction condition; or in order to shift a fifteenth gear (G 15), the first brake (B 1) is disengaged, the second, the third, and the fourth brakes (B 2 , B 3 , B 4) are engaged, the first free-wheel clutch (F 1) is in the locking direction condition, and the second, the third, and the fourth free-wheel clutches (F 2 , F 3 , F 4) are in the overrun operation condition; or in order to shift a sixteenth gear (G 16), the first, the second, the third, and the fourth brakes (B 1 , B 2 , B 3 , B 4) are engaged, and the first, the second, the third, and the fourth free-wheel clutches (F 1 , F 2 , F 3 , F 4) are in the overrun operation condition.

18. The multi-stage transmission of claim 1 , wherein: the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are arranged in an axial sequence of the front-mounted gear set (VRS), the second planetary gear set (RS 2), and the first planetary gear set (RS 1); and each of the front-mounted gear set (VRS), the second planetary gear set (RS 2), and the first planetary gear set (RS 1) is configured as a respective minus planetary gear set.

19. The multi-stage transmission of claim 18 , wherein: the transmission input shaft (1) is connected to a planet carrier (11) of the front-mounted gear set (VRS); a sun gear (10) of the front-mounted gear set (VRS) is fixable via a third brake (B 3) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to a ring gear (12) of the front-mounted gear set (VRS) via a third free-wheel clutch (F 3) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); the ring gear (12) of the front-mounted gear set (VRS) is connected to the planet carrier (8) of the second planetary gear set (RS 2) and is connectable to the ring gear (6) of the first planetary gear set (RS 1) via the second free-wheel clutch (F 2); the ring gear (9) of the second planetary gear set (RS 2) is connected to the transmission output shaft (2) and is connectable to the sun gear (4) of the first planetary gear set (RS 1) via the first free-wheel clutch (F 1); and the sun gear (7) of the second planetary gear set (RS 2) is connected to the planet carrier (5) of the first planetary gear set (RS 1).

20. The multi-stage transmission of claim 18 , wherein: the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4) comprises the first free-wheel clutch (F 1), the second free-wheel clutch (F 2), and a third free-wheel clutch (F 3); and the at least three brakes (B 1 , B 2 , B 3 , B 4) comprises the first brake (B 1), the second brake (B 2), and a third brake (B 3); and in order to shift a first gear (G 1), the first, the second, and the third brakes (B 1 , B 2 , B 3) are disengaged, and the first, the second, and the third free-wheel clutches (F 1 , F 2 , F 3) are in a locking direction condition; or in order to shift a second gear (G 2), the first brake (B 1) is engaged, the second and the third brakes (B 2 , B 3) are disengaged, the first free-wheel clutch (F 1) is in an overrun operation condition, and the second and the third free-wheel clutches (F 2 , F 3) are in the locking direction condition; or in order to shift a third gear (G 3), the second brake (B 2) is engaged, the first and the third brakes (B 1 , B 3) are disengaged, the second free-wheel clutch (F 2) is in the overrun operation condition, and the first and the third free-wheel clutches (F 1 , F 3) are in the locking direction condition; or in order to shift a fourth gear (G 4), the first and the second brakes (B 1 , B 2) are engaged, the third brake (B 3) is disengaged, the first and the second free-wheel clutches (F 1 , F 2) are in the overrun operation condition, and the third free-wheel clutch (F 3) is in the locking direction condition; or in order to shift a fifth gear (G 5), the third brake (B 3) is engaged, the first and the second brakes (B 1 , B 2) are disengaged, the first and the second free-wheel clutches (F 1 , F 2) are in the locking direction condition, and the third free-wheel clutch (F 3) is in the overrun operation condition; or in order to shift a sixth gear (G 6), the first and the third brakes (B 1 , B 3) are engaged, the second brake (B 2) is disengaged, the first and the third free-wheel clutches (F 1 , F 3) are in the overrun operation condition, and the second free-wheel clutch (F 2) is in the locking direction condition; or in order to shift a seventh gear (G 7), the first brake (B 1) is disengaged, the second and the third brakes (B 2 , B 3) are engaged, the first free-wheel clutch (F 1) is in the locking direction condition, and the second and the third free-wheel clutches (F 2 , F 3) are in the overrun operation condition; or in order to shift an eighth gear (G 8), the first, the second, and the third brakes (B 1 , B 2 , B 3) are engaged, and the first, the second, and the third free-wheel clutches (F 1 , F 2 , F 3) are in the overrun operation condition.

21. The multi-stage transmission of claim 1 wherein: the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) are arranged in an axial sequence of a second front-mounted gear set (VR 2), a first front-mounted gear set (VR 1), the second planetary gear set (RS 2), and the first planetary gear set (RS 1); and each of the second front-mounted gear set (VR 2), the first front-mounted gear set (VR 1), the second planetary gear set (RS 2), and the first planetary gear set (RS 1) is configured as a respective minus planetary gear set.

22. The multi-stage transmission of claim 21 , wherein: the transmission input shaft (1) is connected to a planet carrier (17) of the second front-mounted gear set (VR 2); a sun gear (16) of the second front-mounted gear set (VR 2) is connected to a planet carrier (14) of the first front-mounted gear set (VR 1) and is connectable to a ring gear (18) of the second front-mounted gear set (VR 2) via a fourth free-wheel clutch (F 4) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); the ring gear (18) of the second front-mounted gear set (VR 2) is fixable via a fourth brake (B 4) of the at least three brakes (B 1 , B 2 , B 3 , B 4); a sun gear (13) of the first front-mounted gear set (VR 1) is fixable via a third brake (B 3) of the at least three brakes (B 1 , B 2 , B 3 , B 4) and is connectable to the planet carrier (14) of the first front-mounted gear set (VR 1) via a third free-wheel clutch (F 3) of the at least three free-wheel clutches (F 1 , F 2 , F 3 , F 4); a ring gear (15) of the first front-mounted gear set (VR 1) is connected to the planet carrier (8) of the second planetary gear set (RS 2) and is connectable to the ring gear (6) of the first planetary gear set (RS 1) via the second free-wheel clutch (F 2); the ring gear (9) of the second planetary gear set (RS 2) is connected to the transmission output shaft (2) and to the sun gear (4) of the first planetary gear set (RS 1); and the sun gear (7) of the second planetary gear set (RS 2) is connected to the planet carrier (5) of the first planetary gear set (RS 1).

23. The multi-stage transmission of claim 22 , wherein: the at least three free-wheel clutches (F 2 , F 3 , F 4) comprises the second free-wheel clutch (F 2), a third free-wheel clutch (F 3), and a fourth free-wheel clutch (F 4); and the at least three brakes (B 1 , B 2 , B 3 , B 4) comprises the second brake (B 2), a third brake (B 3), and a fourth brake (B 4); and in order to shift a first gear (G 1), the second, the third, and the fourth brakes (B 2 , B 3 , B 4) are disengaged, and the second, the third, and the fourth free-wheel clutches (F 2 , F 3 , F 4) are in a locking direction condition; or in order to shift a second gear (G 2), the second brake (B 2) is engaged, the third and the fourth brakes (B 3 , B 4) are disengaged, the second free-wheel clutch (F 2) is in an overrun operation condition, and the third and the fourth free-wheel clutches (F 3 , F 4) are in the locking direction condition; or in order to shift a third gear (G 3), the third brake (B 3) is engaged, the second and the fourth brakes (B 2 , B 4) are disengaged, the third free-wheel clutch (F 3) is in the overrun operation condition, and the second and the fourth free-wheel clutches (F 2 , F 4) are in the locking direction condition; or in order to shift a fourth gear (G 4), the second and the third brakes (B 2 , B 3) are engaged, the fourth brake (B 4) is disengaged, the second and the third free-wheel clutches (F 2 , F 3) are in the overrun operation condition, and the fourth free-wheel clutch (F 4) is in the locking direction condition; or in order to shift a fifth gear (G 5), the fourth brake (B 4) is engaged, the second and the third brakes (B 2 , B 3) are disengaged, the second and the third free-wheel clutches (F 2 , F 3) are in the locking direction condition, and the fourth free-wheel clutch (F 4) is in the overrun operation condition; or in order to shift a sixth gear (G 6), the second and the fourth brakes (B 2 , B 4) are engaged, the third brake (B 3) is disengaged, the second and the fourth free-wheel clutches (F 2 , F 4) are in the overrun operation condition, and the third free-wheel clutch (F 3) is in the locking direction condition; or in order to shift a seventh gear (G 7), the second brake (B 2) is disengaged, the third and the fourth brakes (B 3 , B 4) are engaged, the second free-wheel clutch (F 2) is in the locking direction condition, and the third and the fourth free-wheel clutches (F 3 , F 4) are in the overrun operation condition; or in order to shift an eighth gear (G 8), the second, the third, and the fourth brakes (B 2 , B 3 , B 4) are engaged, and the second, the third, and the fourth free-wheel clutches (F 2 , F 3 , F 4) are in the overrun operation condition.

24. The multi-stage transmission of claim 1 , wherein the multi-stage transmission is configured as a bottom bracket transmission with the at least three planetary gear sets (VRS, VR 1 , VR 2 , RS 1 , RS 2 , NRS, NR 1 , NR 2) arranged coaxially.

25. A bicycle, comprising the multi-stage transmission of claim 1 .

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