Uninterruptible powershift transmission for bicycles

Description

[0001] The claimed invention relates to the technical field of bicycle transmissions.

[0002] The publication DE 1 99 49 507 discloses transmissions proposed for use in bicycles. These transmissions are characterized by the fact that when shifting from one gear to the next higher or lower gear, only one shifting element is opened and one shifting element is closed. This avoids the need for group shifts, which are critical to shifting quality and require multiple shifting elements to be shifted simultaneously. In addition to brakes, clutches are also provided as shifting elements. However, clutches are complex to operate and therefore unsuitable for use in bicycles.

[0003] From the publication DE 10 2017 216 502 A1, a manual transmission mounted on the bottom bracket of a bicycle is known. Powershift capability and uninterrupted traction are achieved by coupling sun gears with driver elements. The driver elements can be controlled by braking and locking. The transmission features two stepped planetary gears connected in series. This requires group shifting, which is critical for shifting quality.

[0004] The publication DE 10 2016 225144 A1 discloses in its Fig.4 a multi-speed planetary gear for a bicycle with three planetary gear sets, three brakes, one freewheel and two clutches, one of which can also be designed as a freewheel according to paragraph

[0013] of the description.

[0005] The invention is based on the object of providing an improved powershift transmission that offers high shifting quality. This object is achieved by the independent claims. Independent claims 1 to 6 each define a transmission for which protection is sought. Independent claim 7 defines a bicycle for which protection is sought.

[0006] Preferred embodiments of the invention are illustrated in the figures. In detail: Fig. 1 a four-speed gearbox, Fig. 2 a six-speed gearbox, Fig. 3 a nine-speed gearbox, Fig. 4 a four-speed gearbox, Fig. 5 a six-speed gearbox, and Fig. 6 a nine-speed transmission.

[0007] The Fig. 1 The transmission 101 shown is based on two planetary gear sets HRS1, HRS2, which together form a sub-transmission that connects a shaft W1, a shaft W2, a shaft W3, a shaft W4 and a shaft W5. For this purpose, the shaft W1 is connected in a rotationally fixed manner to a sun gear of the planetary gear set HRS2. The second shaft W2 is connected in a rotationally fixed manner to a sun gear of the planetary gear set HRS1. The third shaft W3 forms rotationally fixed connections to a planet carrier of the first planetary gear set HRS1 and a ring gear of the second planetary gear set HRS2. The shaft W5 is connected in a rotationally fixed manner to a ring gear of the planetary gear set HRS1 and a planet carrier of the planetary gear set HRS2.

[0008] An auxiliary shaft H1, shaft W1, and shaft W6 are coupled via another planetary gear set RS3. A rotationally fixed connection exists between shaft W1 and a planet carrier of planetary gear set RS3. A sun gear of planetary gear set RS3 is rotationally fixed to auxiliary shaft H1. A ring gear of planetary gear set RS3 is also rotationally fixed to shaft W6. Auxiliary shaft H1, in turn, is rotationally fixed to shaft W4. This, in turn, means that a rotationally fixed connection exists between the sun gear of planetary gear set RS3 and the sun gear of planetary gear set HRS2.

[0009] The gearbox 101 has two brakes A, C. Brake A allows shaft W6 to be connected in a rotationally fixed manner to a gearbox housing G of the gearbox 101. Brake C allows shaft W2 to be connected in a rotationally fixed manner to the housing G.

[0010] The gearbox 101 also has two freewheels F, D. The freewheel F couples the shaft W1 to the shaft W4. The shaft W1 is also coupled to the shaft W3 via the freewheel D. With respect to the shaft W1, the two freewheels F, D have identical locking and overrunning directions.

[0011] The Fig. 2 The illustrated transmission 201 has, in addition to the planetary gear sets HRS1, HRS2, and RS3, a planetary gear set RS4. The planetary gear sets HRS1 and HRS2 also form a sub-transmission that couples the shafts W2, W3, W4, and W5. The shaft W2 is non-rotatably connected to the sun gears of the two planetary gear sets. A non-rotatably connected connection also exists between the shaft W3 and the planet carrier of the planetary gear set HRS1. The shaft W4 is non-rotatably connected to the ring gear of the planetary gear set HRS2. The planet carrier of the planetary gear set HRS2 and the ring gear of the planetary gear set HRS1 are each non-rotatably connected to the shaft W5.

[0012] The integration of the planetary gear set RS3 into the gearbox 201 corresponds to the gearbox 101.

[0013] The connection of brakes A and C in gearbox 201 also corresponds to gearbox 101. In addition, gearbox 201 has a brake E. This allows a shaft W7 to be connected to the gearbox housing G in a rotationally fixed manner.

[0014] An auxiliary shaft H4 is connected to the shaft W7 for rotational stability. The auxiliary shaft H4, in turn, is connected to a ring gear of the planetary gear set RS4 for rotational stability. This creates a rotational stability connection between the shaft W7 and the ring gear of the planetary gear set RS4.

[0015] A planetary carrier of planetary gear set RS4 is non-rotatably connected to shaft W1. Thus, there is a non-rotatable connection between the planetary carrier of planetary gear set RS3 and the planetary carrier of planetary gear set RS4.

[0016] The sun gear of planetary gear set RS4 is non-rotatably connected to shaft W3. Shaft W3 thus connects the sun gear of planetary gear set RS4 to the planet carrier of planetary gear set HRS1.

[0017] The integration of the freewheels F and D into the gearbox 201 corresponds to the gearbox 101.

[0018] Also in the Fig. 3 In the illustrated transmission 301, the sub-transmission consisting of the planetary gear sets HRS1 and HRS2 connects the shafts W2, W3, W4, and W5. For this purpose, the shaft W2 is connected in a rotationally fixed manner to the sun gear of the planetary gear set HRS1. Furthermore, rotationally fixed connections exist between the shaft W3 and the planet carrier of the planetary gear set HRS1 and the planet carrier of the planetary gear set HRS2. The shaft W4 is connected in a rotationally fixed manner to the sun gear of the planetary gear set HRS2. Furthermore, there is a rotationally fixed connection between the ring gears of the two planetary gear sets and the shaft W5.

[0019] The planetary gears of the planetary gear set HRS2 of the transmission 301 do not mesh with the respective sun gear and the respective ring gear, like the planetary gears of the other planetary gear sets of the exemplary embodiments described here, but rather with another planetary gear of the planetary gear set HRS2 of the transmission 301 and either with the ring gear or the sun gear of this planetary gear set.

[0020] The integration of the RS3 planetary gear set into the 301 gearbox corresponds to the 201 gearbox.

[0021] The integration of the planetary gear set RS4 of the transmission 301 also corresponds to the transmission 201. In contrast to the transmission 201, however, the planetary gear set RS4 of the transmission 301 has stepped planets.

[0022] In addition to the brakes A, C and E, whose integration into the gearbox 301 corresponds to the gearbox 201, the gearbox 301 has a brake B. With this, a shaft W8 can be connected to the gearbox housing G in a rotationally fixed manner.

[0023] A ring gear of another planetary gear set RS5 is non-rotatably connected to shaft W8. Its planet carrier is non-rotatably connected to shaft W2 and, via shaft W2, to the sun gear of planetary gear set HRS1. A sun gear of planetary gear set RS5, as well as the planet carrier of planetary gear set RS3 and the planet carrier of planetary gear set RS4, are non-rotatably connected to shaft W1. The planet gears of planetary gear set RS5 are designed as stepped planets.

[0024] The integration of the freewheels D and F into the gearbox 301 corresponds to the gearbox 101.

[0025] The Fig. 4 The gearbox 401 shown has, like the gearbox 101, Fig. 1 only three planetary gear sets HRS1, HRS2 and RS3. The planetary gear sets HRS1 and HRS2 connect the shafts W2, W3, W4 and W5 to each other. Specifically, the shaft W2 is non-rotatably connected to the sun gear of the planetary gear set HRS1. There is also a non-rotatable connection between the shaft W3 and the ring gear of the planetary gear set HRS2. The ring gear of the planetary gear set HRS1 is non-rotatably connected to the shaft W4. The planet carriers of the two planetary gear sets are non-rotatably connected to each other and to the shaft W5.

[0026] Instead of brake C, the gearbox 401 has two auxiliary shaft brakes Ca and Cb. An auxiliary shaft H2 can be connected to the housing in a rotationally fixed manner by means of the auxiliary shaft brake Ca. Similarly, an auxiliary shaft H3 can be connected to the housing G in a rotationally fixed manner by means of the auxiliary shaft brake Cb.

[0027] The auxiliary shafts H2 and H3 are each connected to the shaft W2 by an auxiliary shaft freewheel Fca and Fcb, respectively. Both auxiliary shaft freewheels Fca and Fcb have different operating directions. Thus, the locking directions of both auxiliary shaft freewheels Fca and Fcb are opposite to each other with respect to the second shaft. Accordingly, their overrunning directions are also opposite.

[0028] The integration of the freewheels D and F into the gearbox 401 corresponds to the gearbox 101.

[0029] The Fig. 5 The illustrated transmission 501 largely corresponds to transmission 401. Unlike transmission 401, it has a fourth planetary gear set RS4 with an auxiliary shaft H4 and a shaft W7. Their integration into transmission 501 corresponds to transmission 201.

[0030] In contrast to gearboxes 201 and 401, the auxiliary shaft H1 of gearbox 501 is not rotationally connected to the shaft W4, but is coupled to it via an auxiliary shaft freewheel FA. The orientation of the auxiliary shaft freewheel Fa with respect to the shaft W4 corresponds to the orientation of the freewheel F.

[0031] The Fig. 6 The illustrated transmission 601 is derived from transmission 501 by integrating a fifth planetary gear set RS5. A sun gear of the planetary gear set RS5 is connected in a rotationally fixed manner to the shaft W1. A planet carrier of the planetary gear set RS5 is connected in a rotationally fixed manner to the shaft W2. The ring gear is integrated via auxiliary shafts H4, H5, auxiliary shaft freewheels Fba, Fbb, and auxiliary shaft brakes Ba, Bb.

[0032] Specifically, the auxiliary shafts H4 and H5 are each coupled to the ring gear of the planetary gear set RS5 via an intermediate shaft freewheel Fba or Fbb. The overrunning and locking directions of the intermediate shaft freewheels Fba and Fbb are opposite to each other with respect to the ring gear. The auxiliary shaft H4 can be connected to the housing G in a rotationally fixed manner using the auxiliary shaft brake Ba. Similarly, the auxiliary shaft H5 can be connected to the housing G in a rotationally fixed manner using the auxiliary shaft brake Bc. Bezugszeichen

[0033] 101Gearbox 201Gearbox 301Gearbox 401Gearbox 501Gearbox 601Gearbox W1Shaft W2Shaft W3Shaft W4Shaft W5Shaft W6Shaft W7Shaft W8Shaft HRS1Planetary gear set HRS2Planetary gear set RS3Planetary gear set RS4Planetary gear set RS5Planetary gear set FFreewheel DFreewheel GHousing H1Auxiliary shaft H2Auxiliary shaft H3Auxiliary shaft H4Auxiliary shaft H5Auxiliary shaft BaAuxiliary shaft brake BbAuxiliary shaft brake CaAuxiliary shaft brake CbAuxiliary shaft brake FbaAuxiliary shaft freewheel FbbAuxiliary shaft freewheel FcaAuxiliary shaft freewheel FcbAuxiliary shaft freewheel FaAuxiliary shaft freewheel CaAuxiliary shaft brake CbAuxiliary shaft brake BaAuxiliary shaft brake BbAuxiliary shaft brake

Claims

1. Transmission (101) for a bicycle with a first shaft (W1), a second shaft (W2), a third shaft (W3), a fourth shaft (W4), a fifth shaft (W5), a sixth shaft (W6), a first partial transmission (HRS1, HRS2), a second partial transmission (RS3), a first freewheel (D), a second freewheel (F), a first brake (A), a second brake (C) and a housing (G); wherein the first partial transmission (HRS1, HRS2) has a first planetary gear set (HRS1) and a second planetary gear set (HRS2), wherein the first planetary gear set (HRS1) has a first sun gear, which is rotationally conjointly formed with the second shaft (W2), a first planet carrier, which is rotationally conjointly formed with the third shaft (W3), and a first ring gear, wherein the second planetary gear set (HRS2) has a second sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a second planet carrier, which is rotationally conjointly formed with the fifth shaft (W5), and a second ring gear, wherein the first planet carrier is rotationally conjointly connected to the second ring gear, wherein the first ring gear is rotationally conjointly connected to the second planet carrier, wherein the second partial transmission (RS3) has a third planetary gear set (RS3), wherein the third planetary gear set (RS3) has a third sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a third planet carrier, which is rotationally conjointly formed with the first shaft (W1), and a third ring gear, which is rotationally conjointly formed with the sixth shaft (W6), wherein the third sun gear is rotationally conjointly connected to the second sun gear, wherein the first shaft (W1) forms an input shaft of the transmission (101) and is designed for connecting to pedal cranks of a bicycle, wherein the fifth shaft (W5) forms an output shaft of the transmission (101), wherein a first brake (A) is connected to the sixth shaft (W6), whereby the sixth shaft (W6) is rotationally conjointly connectable to the housing (G) by means of the first brake (A); wherein the second shaft (W2) is rotationally conjointly connectable to the housing (G) by means of a second brake (C); wherein the first planetary gear set (HRS1), the second planetary gear set (HRS2) and the third planetary gear set (RS3) are each designed as a single minus planetary gear set, and wherein the first freewheel (D) locks the third shaft (W3) and the second freewheel (F) locks the fourth shaft (W4) in the same directions of rotation relative to the first shaft (W1).

2. Transmission (201) for a bicycle with a first shaft (W1), a second shaft (W2), a third shaft (W3), a fourth shaft (W4), a fifth shaft (W5), a sixth shaft (W6), a seventh shaft (W7), a first partial transmission (HRS1, HRS2), a second partial transmission (RS3, RS4), a first freewheel (D), a second freewheel (F), a first brake (A), a second brake (C), a third brake (E) and a housing (G); wherein the first partial transmission (HRS1, HRS2) has a first planetary gear set (HRS1) and a second planetary gear set (HRS2), wherein the first planetary gear set (HRS1) has a first sun gear, which is rotationally conjointly formed with the second shaft (W2), a first planet carrier, which is rotationally conjointly formed with the third shaft (W3), and a first ring gear, wherein the second planetary gear set (HRS2) has a second sun gear, a second planet carrier, which is rotationally conjointly formed with the fifth shaft (W5), and a second ring gear, which is rotationally conjointly formed with the fourth shaft (4), wherein the first ring gear is rotationally conjointly connected to the second planet carrier, wherein the second partial transmission (RS3, RS4) has a third planetary gear set (RS3), wherein the third planetary gear set has a third sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a third planet carrier, which is rotationally conjointly formed with the first shaft (W1), and a third ring gear, which is rotationally conjointly formed with the sixth shaft (W6), wherein the third sun gear is rotationally conjointly connected to the second ring gear, wherein the first shaft (W1) forms an input shaft of the transmission (201) and is designed for connecting to pedal cranks of a bicycle, wherein the fifth shaft (W5) forms an output shaft of the transmission (201), wherein the first brake (A) is connected to the sixth shaft (W6), whereby the sixth shaft (W6) is rotationally conjointly connectable to the housing (G) by means of the first brake (A); wherein the second shaft (W2) is rotationally conjointly connectable to the housing (G) by means of the second brake (C); wherein the second partial transmission (RS3, RS4) furthermore has a fourth planetary gear set (RS4) with a fourth sun gear, which is rotationally conjointly formed with the third shaft (W3), a fourth planet carrier, which is rotationally conjointly formed with the third planet carrier, and a fourth ring gear, which is rotationally conjointly formed with the seventh shaft (W7); wherein the third brake (E) is connected to the seventh shaft (W7), whereby the seventh shaft (W7) is rotationally conjointly connectable to the housing (G) by means of the third brake (E); wherein the first planetary gear set (HRS1), the second planetary gear set (HRS2), the third planetary gear set (RS3) and the fourth planetary gear set (RS4) are each designed as a single minus planetary gear set, and wherein the first freewheel (D) locks the third shaft (W3) and the second freewheel (F) locks the fourth shaft (W4) in the same directions of rotation relative to the first shaft (W1).

3. Transmission (301) for a bicycle with a first shaft (W1), a second shaft (W2), a third shaft (W3), a fourth shaft (W4), a fifth shaft (W5), a sixth shaft (W6), a seventh shaft (W7), an eighth shaft (W8), a first partial transmission (HRS1, HRS2), a second partial transmission (RS3, RS4, RS5), a first freewheel (D), a second freewheel (F), a first brake (A), a second brake (B), a third brake (C), a fourth brake (E) and a housing (G); wherein the first partial transmission (HRS1, HRS2) has a first planetary gear set (HRS1) and a second planetary gear set (HRS2), wherein the first planetary gear set (HRS1) has a first sun gear, which is rotationally conjointly formed with the second shaft (W2), a first planet carrier, which is rotationally conjointly formed with the third shaft (W3), and a first ring gear, wherein the second planetary gear set (HRS2) has a second sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a second planet carrier, and a second ring gear, which is rotationally conjointly formed with the fifth shaft (W5), wherein the first planet carrier is rotationally conjointly connected to the second planet carrier, wherein the first ring gear is rotationally conjointly connected to the second ring gear, wherein the second partial transmission (RS3, RS4, RS5) has a third planetary gear set (RS3), wherein the third planetary gear set has a third sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a third planet carrier, which is rotationally conjointly formed with the first shaft (W1), and a third ring gear, which is rotationally conjointly formed with the sixth shaft (W6), wherein the third sun gear is rotationally conjointly connected to the second sun gear, wherein the first shaft (W1) forms an input shaft of the transmission (101) and is designed for connecting to pedal cranks of a bicycle, wherein the fifth shaft (W5) forms an output shaft of the transmission (101), wherein the first brake (A) is connected to the sixth shaft (W6), whereby the sixth shaft (W6) is rotationally conjointly connectable to the housing (G) by means of the first brake (A); wherein the second shaft (W2) is rotationally conjointly connectable to the housing (G) by means of the third brake (C); wherein the second partial transmission (RS3, RS4, RS5) furthermore has a fourth planetary gear set (RS4) with a fourth sun gear, which is rotationally conjointly formed with the third shaft (W3), a fourth planet carrier, which is rotationally conjointly formed with the first shaft (W1), a fourth ring gear, which is rotationally conjointly formed with the seventh shaft (W7); wherein the fourth brake (E) is connected to the seventh shaft (W7), whereby the seventh shaft (W7) is rotationally conjointly connectable to the housing (G) by means of the fourth brake (E); wherein the second partial transmission (RS3, RS4, RS5) furthermore has a fifth planetary gear set (RS5) with a fifth sun gear, which is rotationally conjointly formed with the third planet carrier, a fifth planet carrier, which is rotationally conjointly formed with the second shaft (W2), a fifth ring gear, which is rotationally conjointly formed with the eighth shaft (W8); wherein the second brake (B) is connected to the eighth shaft (W8), whereby the eighth shaft (W8) is rotationally conjointly connectable to the housing (G) by means of the second brake (B); wherein the first planetary gear set (HRS1) and the third planetary gear set (RS3) are each designed as a single minus planetary gear set, wherein the second planetary gear set (HRS2) is designed as a single plus planetary gear set; wherein the fourth planetary gear set (RS4) is designed as a minus planetary gear set with a stepped planet, the smaller planetary gear of which meshes with the fourth sun gear and the larger planetary gear of which meshes with the fourth ring gear; wherein the fifth planetary gear set (RS4) is designed as a minus planetary gear set with a stepped planet, the smaller planetary gear of which meshes with the fifth sun gear and the larger planetary gear of which meshes with the fifth ring gear; and wherein the first freewheel (D) locks the third shaft (W3) and the second freewheel (F) locks the fourth shaft (W4) in the same directions of rotation relative to the first shaft (W1).

4. Transmission (401, 501) for a bicycle with a first shaft (W1), a second shaft (W2), a third shaft (W3), a fourth shaft (W4), a fifth shaft (W5), a sixth shaft (W6), a first partial transmission (HRS1, HRS2), a second partial transmission (RS3), a first freewheel (D), a second freewheel (F), a first brake (A), a second brake (Ca), a third brake (Cb), a third freewheel (Fca), a fourth freewheel (Fcb) and a housing (G); wherein the first partial transmission (HRS1, HRS2) has a first planetary gear set (HRS1) and a second planetary gear set (HRS2), wherein the first planetary gear set (HRS1) has a first sun gear, which is rotationally conjointly formed with the second shaft (W2), a first planet carrier, and a first ring gear, wherein the second planetary gear set (HRS2) has a second sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a second planet carrier, which is rotationally conjointly formed with the fifth shaft (W5), and a second ring gear, which is rotationally conjointly formed with the third shaft (W3), wherein the first planet carrier is rotationally conjointly connected to the second planet carrier, wherein the first ring gear is rotationally conjointly connected to the second sun gear, wherein the second partial transmission (RS3) has a third planetary gear set (RS3), wherein the third planetary gear set has a third sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a third planet carrier, which is rotationally conjointly formed with the first shaft (W1), and a third ring gear, which is rotationally conjointly formed with the sixth shaft (W6), wherein the third sun gear is rotationally conjointly connected to the second sun gear, wherein the first shaft (W1) forms an input shaft of the transmission (401, 501) and is designed for connecting to pedal cranks of a bicycle, wherein the fifth shaft (W5) forms an output shaft of the transmission (401, 501), wherein the first brake (A) is connected to the sixth shaft (W6), whereby the sixth shaft (W6) is rotationally conjointly connectable to the housing (G) by means of the first brake (A); wherein the second shaft (W2) is connectable to the second brake (Ca) via the third freewheel (Fca), wherein the third freewheel (Fca) is rotationally conjointly connectable to the housing (G) by means of the second brake (Ca), the second shaft (W2) is connectable to the third brake (Cb) via the fourth freewheel (Fcb), wherein the fourth freewheel (Fcb) is rotationally conjointly connectable to the housing (G) by means of the third brake (Cb); wherein the third freewheel (Fca) and the fourth freewheel (Fcb) lock in opposite directions of rotation of the second shaft (W2); wherein the first planetary gear set (HRS1), the second planetary gear set (HRS2) and the third planetary gear set (RS3) are each designed as a single minus planetary gear set, and wherein the first freewheel (D) locks the third shaft (W3) and the second freewheel (F) locks the fourth shaft (W4) relative to the first shaft (W1) in the same directions of rotation.

5. Transmission (401, 501) for a bicycle with a first shaft (W1), a second shaft (W2), a third shaft (W3), a fourth shaft (W4), a fifth shaft (W5), a sixth shaft (W6), a first partial transmission (HRS1, HRS2), a second partial transmission (RS3), a first freewheel (D), a second freewheel (F), a first brake (A), a second brake (Ca), a third brake (Cb), a fourth brake (E), a third freewheel (Fca), a fourth freewheel (Fcb), a fifth freewheel (Fa), and a housing (G); wherein the first partial transmission (HRS1, HRS2) has a first planetary gear set (HRS1) and a second planetary gear set (HRS2), wherein the first planetary gear set (HRS1) has a first sun gear, which is rotationally conjointly formed with the second shaft (W2), a first planet carrier, and a first ring gear, wherein the second planetary gear set (HRS2) has a second sun gear, which is rotationally conjointly formed with the fourth shaft (W4), a second planet carrier, which is rotationally conjointly formed with the fifth shaft (W5), and a second ring gear, which is rotationally conjointly formed with the third shaft (W3), wherein the first planet carrier is rotationally conjointly connected to the second planet carrier, wherein the first ring gear is rotationally conjointly connected to the second sun gear, wherein the second partial transmission (RS3, RS4) has a third planetary gear set (RS3), wherein the third planetary gear set has a third sun gear, which is connectable to the fourth shaft (W4) via the fifth freewheel (Fa), a third planet carrier, which is rotationally conjointly formed with the first shaft (W1), and a third ring gear, which is rotationally conjointly formed with the sixth shaft (W6), wherein the third sun gear is rotationally conjointly connected to the second sun gear, wherein the first shaft (W1) forms an input shaft of the transmission (401, 501) and is designed for connecting to pedal cranks of a bicycle, wherein the fifth shaft (W5) forms an output shaft of the transmission (401, 501), wherein the first brake (A) is connected to the sixth shaft (W6), whereby the sixth shaft (W6) is rotationally conjointly connectable to the housing (G) by means of the first brake (A); wherein the second shaft (W2) is connectable to the second brake (Ca) via the third freewheel (Fca), wherein the third freewheel (Fca) is rotationally conjointly connectable to the housing (G) by means of the second brake (Ca), the second shaft (W2) is connectable to the third brake (Cb) via the fourth freewheel (Fcb), wherein the fourth freewheel (Fcb) is rotationally conjointly connectable to the housing (G) by means of the third brake (Cb); wherein the third freewheel (Fca) and the fourth freewheel (Fcb) lock in opposite directions of rotation of the second shaft (W2); wherein the second partial transmission (RS3, RS4) furthermore has a fourth planetary gear set (RS4) with a fourth sun gear, which is rotationally conjointly formed with the third shaft (W3), a fourth planet carrier, which is rotationally conjointly formed with the first shaft (W1), a fourth ring gear, which is rotationally conjointly formed with the seventh shaft (W7); wherein the fourth brake (E) is connected to the seventh shaft (W7), whereby the seventh shaft (W7) is rotationally conjointly connectable to the housing (G) by means of the fourth brake (E); wherein the first planetary gear set (HRS1), the second planetary gear set (HRS2), the third planetary gear set (RS3) and the fourth planetary gear set (RS4) are each designed as a single minus planetary gear set, and wherein the first freewheel (D) locks the third shaft (W3) and the second freewheel (F) locks the fourth shaft (W4) in the same directions of rotation relative to the first shaft (W1).

6. Transmission (601) for a bicycle with a first shaft (W1), a second shaft (W2), a third shaft (W3), a fourth shaft (W4), a fifth shaft (W5), a sixth shaft (W6), a seventh shaft (W7), an eighth shaft (W8), a first partial transmission (HRS1, HRS2), a second partial transmission (RS3, RS4, RS5), a first freewheel (D), a second freewheel (F), a third freewheel (Fca), a fourth freewheel (Fcb), a fifth freewheel (Fba), a sixth freewheel (Fbb), a first brake (A), a second brake (B), a third brake (Ca), a fourth brake (Cb), a fifth brake (E), a sixth brake (Ba), a seventh brake (Bb), a seventh freewheel (Fa) and a housing (G); wherein the first partial transmission (HRS1, HRS2) has a first planetary gear set (HRS1) and a second planetary gear set (HRS2), wherein the first planetary gear set (HRS1) has a first sun gear, which is rotationally conjointly formed with the second shaft (W2), a first planet carrier, and a first ring gear, wherein the second planetary gear set (HRS2) has a second sun gear, which is rotationally conjointly formed with the third shaft (W3), a second planet carrier, which is rotationally conjointly formed with the fifth shaft (W5), and a second ring gear, which is rotationally conjointly formed with the fourth shaft (W4), wherein the first planet carrier is rotationally conjointly connected to the second planet carrier, wherein the first ring gear is rotationally conjointly connected to the second sun gear, wherein the second partial transmission (RS3, RS4, RS5) has a third planetary gear set (RS3), wherein the third planetary gear set has a third sun gear, which is rotationally conjointly formed with the sixth shaft (W6), a third planet carrier, which is rotationally conjointly formed with the first shaft (W1), and a third ring gear, which is rotationally conjointly formed with the fourth shaft (W4), wherein the first shaft (W1) forms an input shaft of the transmission (601) and is designed for connecting to pedal cranks of a bicycle, wherein the fifth shaft (W5) forms an output shaft of the transmission (601), wherein the second partial transmission (RS3, RS4, RS5) furthermore has a fourth planetary gear set (RS4) with a fourth sun gear, which is rotationally conjointly formed with the third shaft (W3), a fourth planet carrier, which is rotationally conjointly formed with the first shaft (W1), a fourth ring gear, which is connectable to the seventh shaft (W7) via the seventh freewheel (Fa); wherein the fifth brake (E) is connected to the seventh shaft (W7), whereby the seventh shaft (W7) is rotationally conjointly connectable to the housing (G) by means of the fourth brake (E); wherein the second partial transmission (RS3, RS4, RS5) furthermore has a fifth planetary gear set (RS5) with a fifth sun gear, which is rotationally conjointly formed with the third planet carrier, a fifth planet carrier, which is rotationally conjointly formed with the second shaft (W2), a fifth ring gear, which is rotationally conjointly formed with the eighth shaft (W8); wherein the second shaft (W2) is connectable to the second brake (Ca) via the third freewheel (Fca), wherein the third freewheel (Fca) is rotationally conjointly connectable to the housing (G) by means of the second brake (Ca), the second shaft (W2) is connectable to the third brake (Cb) via the fourth freewheel (Fcb), wherein the fourth freewheel (Fcb) is rotationally conjointly connectable to the housing (G) by means of the third brake (Cb); wherein the third freewheel (Fca) and the fourth freewheel (Fcb) lock in opposite directions of rotation of the second shaft (W2); wherein the eighth shaft (W8) is connectable to the sixth brake (Ba) via the fifth freewheel (Fba), wherein the fifth freewheel (Fba) is rotationally conjointly connectable to the housing (G) by means of the sixth brake (Ba), the eighth shaft (W8) is connectable to the seventh brake (Bb) via the sixth freewheel (Fbb), wherein the sixth freewheel (Fbb) is rotationally conjointly connectable to the housing (G) by means of the seventh brake (Bb); wherein the fifth freewheel (Fba) and the sixth freewheel (Fba) lock in opposite directions of rotation of the eighth shaft (W8); wherein the first brake (A) is connected to the sixth shaft (W6), whereby the sixth shaft (W6) is rotationally conjointly connectable to the housing (G) by means of the first brake (A); wherein the first planetary gear set (HRS1), the second planetary gear set (HRS2), the third planetary gear set (RS3), the fourth planetary gear set (RS4) and the fifth planetary gear set (RS5) are each designed as a single minus planetary gear set, and wherein the first freewheel (D) locks the third shaft (W3) and the second freewheel (F) locks the fourth shaft (W4) relative to the first shaft (W1) in the same directions of rotation.

7. Bicycle, characterized by a transmission according to any one of the preceding claims.

8. Bicycle according to the preceding claim, characterized in that a chain ring of the bicycle is rotationally conjointly connected to the fifth shaft (W5) .