DE102022209134B3 - Planetary bottom bracket gear for a bicycle or pedelec - Google Patents

Abstract

It is a bottom bracket gearbox in planetary design for a bicycle or a pedelec (1) with a pedal crankshaft (Wan) as a drive and a gearbox output shaft (Wab) as an output and at least four further shafts (W1, W2, W3, W3I, W4), with three Planetary gear sets (RS1, RS2, RS3), which are arranged coaxially to the pedal crankshaft (Wan), and with five switching elements (B1, B2, B3, F1, F1I, F1II, F1III, F1IV, FV, F2, F2I, F2II,) for Implementation of at least six gears (V1, V2, V3, V4, V5, V6) is proposed, wherein a first sub-transmission with a first planetary gear set (RS1) and a second planetary gear set (RS2) is provided, the first sub-transmission being provided with a first switching element (B1 ), a second switching element (B2) and a fourth switching element (F1, F1I, F1II, F1III, F1IV, FV) are assigned, a second partial transmission with a third planetary gear set (RS3) being provided, the second partial transmission having a third switching element ( B3) and a fifth switching element (F2, F2I, F2II) are assigned, with two elements of the first planetary gear set (RS1) or the second planetary gear set (RS2) via the fourth switching element (F1, F1I, F1II, F1III, F1IV, FV) can be connected to one another and two elements of the third planetary gear set (RS3) can be connected to one another via the fifth switching element (F2, F2I, F2II) in order to lock the second partial transmission.

Description

The present invention relates to a bottom bracket gear in planetary design for a bicycle or a pedelec with a pedal crankshaft as a drive and a transmission output shaft as an output as well as with at least four further shafts, with at least three planetary gear sets, which are arranged coaxially to the pedal crankshaft and with at least five switching elements for realizing at least six courses. The invention further relates to a bicycle or pedelec with the bottom bracket gear.

For example from the publication DE 10 2016 225 169 A1 is a planetary gearbox for a bicycle or pedelec. To achieve only four gears, the transmission includes at least two planetary gear sets, of which at least one planetary gear set is necessarily designed as a space-intensive plus planetary gear set. Furthermore, at least four switching elements are required. In a further embodiment variant of the transmission, four additional gears are achieved by adding two additional switching elements and another planetary gear set. Due to the intended interconnection or connection of the various planetary gear sets, the known transmission has a space-intensive design. Also the DE 10 2016 225 144 A1 , the DE 10 2019 208 536 A1 , the DE 10 2016 225 157 A1 and the DE 10 2018 208 380 A1 reveal gearbox with switching elements.

Accordingly, the present invention is based on the object of realizing a bottom bracket gear of the type described at the outset with the least possible construction effort and with the lowest possible component load and with particularly effective gearing efficiency.

This object is achieved according to the invention by objects with the features of patent claim 1 or 23. Advantageous and claimed further developments result from the subclaims and the description as well as the drawings.

A planetary bottom bracket gearbox is therefore proposed for a bicycle or a pedelec. The bottom bracket gear has a pedal crankshaft as a drive and a transmission output shaft as an output as well as at least four further shafts, the output preferably taking place via a chain wheel, a belt wheel or the like. Furthermore, the bottom bracket gear includes three planetary gear sets, which are arranged coaxially to the pedal crankshaft, and five switching elements for realizing at least six gears in the proposed bottom bracket gear. In order to provide a particularly effective and space-saving design for the bottom bracket gear, a first sub-transmission with a first planetary gear set and a second planetary gear set is provided, with the first sub-transmission being assigned a first switching element, a second switching element and a fourth switching element. Furthermore, a second partial transmission with a third planetary gear set is provided, with the second partial transmission being assigned a third switching element and a fifth switching element. To lock the first partial transmission, two elements of the first planetary gear set or the second planetary gear set or an element of the first planetary gear set can be connected to one another with an element of the second planetary gear set via the fourth switching element. Furthermore, in order to lock the second partial transmission, two elements of the third planetary gear set can be connected to one another via the fifth switching element.

The proposed bottom bracket gear therefore essentially consists of two partial gears, with the first partial gear forming a 3-speed gear group, while the second partial gear forms a 2-speed gear group, so that a total of six gears can be achieved. The order of the two partial transmissions coupled to one another can be varied by either coupling the first partial transmission with the drive and the second partial transmission with the output or vice versa. In this way, with the above-described connection of only three planetary gear sets provided and only five switching elements provided, a particularly simple and compact structure is achieved in the proposed bottom bracket gear. In addition, there are particularly low component loads and an advantageously high gearing efficiency due to the geometric gear range in the bottom bracket gear.

For the mechanical connection of elements of the planetary gear sets, in addition to the drive and output, only four other shafts or shaft-like elements are preferably used, whereby the term shaft does not exclusively mean a cylindrical, rotatably mounted machine element for transmitting torque, but rather also includes general connecting elements to understand that connect the individual wheelset elements to each other for torque transmission.

As part of a first embodiment variant of the bottom bracket gear, in which the first partial gear is connected to the drive or to the pedal crankshaft, it is provided for a space-saving arrangement that the pedal crankshaft is connected to a second element of the second planetary gear set and to a third element of the first tarpaulin tengear set is connected, that the transmission output shaft is connected to a third element of the third planetary gear set, that a second element of the first planetary gear set is connected to a first element of the second planetary gear set via a second shaft, and that a third element of the second planetary gear set is connected via a fourth shaft is connected to a second element of the third planetary gear set.

As part of a second embodiment variant of the bottom bracket gear, in which the second partial gear is connected to the drive or to the pedal crank, it is provided for a space-saving arrangement that the pedal crankshaft is connected to a second element of the third planetary gear set and that the transmission output shaft is connected to a third element of the second planetary gear set, that a third element of the third planetary gear set is connected via a fourth shaft to a second element of the second planetary gear set and to a third element of the first planetary gear set, and that a first element of the second planetary gear set is connected to a second via a second shaft Element of the first planetary gear set is connected.

In order to achieve the space-saving arrangement in the proposed bottom bracket gear with regard to the arrangement of the switching elements, it is provided, regardless of the embodiment variants, that when the first switching element is closed, a first shaft connected to a first element of the first planetary gear set is provided with a housing or with a non-rotatable component or the like is connected in that when the second switching element is closed, a second shaft connected to the second element of the first planetary gear set and to the first element of the second planetary gear set is connected to the housing and that when the third switching element is closed, a third shaft connected to a first element of the third planetary gear set is connected connected to the housing.

In the context of the present invention, it is provided in the proposed bottom bracket gear that the first switching element, the second switching element and the third switching element are each designed as a positive brake and/or that the fourth switching element and the fifth switching element are each designed as a freewheel.

The switching elements designed as brakes are preferably designed as positive switching elements, for example as inexpensive switching claws or the like, for example with a toothed brake ring and a corresponding switching pawl. Brakes as switching elements have the advantage that they can be easily accessed from outside for actuation. Since the freewheels provided are used as clutches, it is an advantage if the brakes z. B. are designed as one-way brakes to prevent the transmission from blocking when the direction of rotation is reversed on the drive or output.

Non-switchable freewheels are preferably used as freewheels. This has the advantage that no switching operation is required for the passive switching elements. The non-switchable freewheel transmits torque when it is locked. No torque is transmitted in the opposite direction of rotation. However, it is conceivable that switchable freewheels or switchable freewheel brakes can also be used.

In the proposed bottom bracket gear, it can be provided for blocking the first partial gear that, as part of a first blocking variant, the first element of the first planetary gear set can be connected to the third element of the first planetary gear set via the fourth switching element. As part of a second blocking variant of the first partial transmission, the first element of the second planetary gear set can be connected to the second element of the second planetary gear set via the fourth switching element. As part of a third blocking variant of the first partial transmission, the second element of the second planetary gear set can be connected to the third element of the second planetary gear set via the fourth switching element. As part of a fourth blocking variant of the first partial transmission, the first element of the first planetary gear set can be connected to the second element of the first planetary gear set via the fourth switching element. As part of a fifth blocking variant of the first partial transmission, the first element of the second planetary gear set can be connected to the third element of the second planetary gear set via the fourth switching element. Finally, as part of a sixth blocking variant of the first partial transmission, the first element of the first planetary gear set can be connected to the third element of the second planetary gear set via the fourth switching element.

In order to lock the second partial transmission, it can be provided in the proposed bottom bracket transmission that, as part of a first blocking variant of the second partial transmission, the first element of the third planetary gear set can be connected to the third element of the third planetary gear set via the fifth switching element. As part of a second blocking variant of the second partial transmission, the first element of the third planetary gear set can be connected to the second element of the third planetary gear set via the fifth switching element. Finally, in As part of a third blocking variant of the second partial transmission, the second element of the third planetary gear set can be connected to the third element of the third planetary gear set via the fifth switching element.

Regardless of the locking variants described above, further locking variants are possible through further connections, not yet described, between two elements of the planetary gear sets in question.

As part of a next development of the invention, it can be provided that the first planetary gear set and/or the second planetary gear set and/or the third planetary gear set are designed as a minus planetary gear set. The use of minus planetary gear sets results in a particularly space-saving arrangement. It is also conceivable that the first planetary gear set and/or the second planetary gear set and/or the third planetary gear set are designed as a plus planetary gear set. When using complex plus planetary gear sets, there is greater flexibility in the choice of gear ratios.

A minus planetary gear set can preferably be converted into a plus planetary gear set if the planetary gear carrier and ring gear connection on this gear set are swapped with one another and the amount of the stationary gear ratio is increased by 1. A minus planetary gear set has rotatably mounted planet gears on its planet gear carrier, which mesh with the sun gear and the ring gear of this planetary gear set, so that the ring gear rotates in the opposite direction to the sun gear rotation direction when the planet gear carrier is held and the sun gear is rotating. A plus planetary gear set has inner and outer planetary gears that are rotatably mounted on its planetary gear carrier and mesh with one another, with the sun gear of this planetary gearset meshing with the inner planetary gears and the ring gear of this planetary gearset meshing with the outer planetary gears, so that the ring gear is in position when the planetary gear carrier is held in place and rotating Sun gear rotates in the same direction of rotation as the sun gear rotation.

For the person skilled in the art, this means that in the case of the individual gear sets designed as minus planetary gear sets, a first element or gear set element is designed as a sun gear, a second element is designed as a planet gear carrier or web and a third element is designed as a ring gear. This also means that in the case of an individual gear set designed as a plus planetary gear set, the first element is designed as a sun gear, the second element as a ring gear and the third element as a planet gear carrier or web.

In order to further optimize the control of the proposed bottom bracket gear, it is provided that at least one torque sensor or the like is provided on the drive and/or on the output.

In order to electrically support the drive in the proposed bottom bracket gear, at least one electric machine or the like can be connected or connectable to the drive or to the pedal crankshaft and / or to the output or to the transmission output shaft or be permanently or releasably coupled. Preferably, the electric machine can be arranged axially parallel to the pedal crankshaft.

A further aspect of the present invention claims a bicycle or pedelec with the bottom bracket gear described above. This results in the advantages already described and other advantages.

The present invention is explained further below with reference to the drawings.

• 1 eine Prinzipansicht einer ersten Ausführungsvariante eines erfindungsgemäßen Tretlagergetriebes eines Fahrrades oder Pedelecs mit einem ersten mit dem Antrieb verbundenen Teilgetriebe und einem nachgeschalteten zweiten Teilgetriebe mit einer ersten Verblockungsvariante bei dem ersten Teilgetriebe und dem zweiten Teilgetriebe;
• 2 eine Prinzipansicht einer zweiten Ausführungsvariante des Tretlagergetriebes mit dem mit dem Antrieb verbundenen zweiten Teilgetriebe und dem nachgeschalteten ersten Teilgetriebe mit der ersten Verblockungsvariante bei dem ersten Teilgetriebe und dem zweiten Teilgetriebe;
• 3 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer zweiten Verblockungsvariante bei dem ersten Teilgetriebe und der ersten Verblockungsvariante bei dem zweiten Teilgetriebe;
• 4 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer dritten Verblockungsvariante bei dem ersten Teilgetriebe und der ersten Verblockungsvariante bei dem zweiten Teilgetriebe;
• 5 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer vierten Verblockungsvariante bei dem ersten Teilgetriebe und der ersten Verblockungsvariante bei dem zweiten Teilgetriebe;
• 6 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer fünften Verblockungsvariante bei dem ersten Teilgetriebe und der ersten Verblockungsvariante bei dem zweiten Teilgetriebe;
• 7 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer sechsten Verblockungsvariante bei dem ersten Teilgetriebe und der ersten Verblockungsvariante bei dem zweiten Teilgetriebe;
• 8 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit der ersten Verblockungsvariante bei dem ersten Teilgetriebe und einer ersten Verblockungsvariante bei dem zweiten Teilgetriebe;
• 9 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit der ersten Verblockungsvariante bei dem ersten Teilgetriebe und einer zweiten Verblockungsvariante bei dem zweiten Teilgetriebe;
• 10 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einem als Plus-Planetenradsatz ausgeführten dritten Planetenradsatz;
• 11 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einem beispielhaft angedeuteten Drehmomentsensor am Antrieb;
• 12 eine Prinzipansicht der zweiten Ausführungsvariante des Tretlagergetriebes mit einem beispielhaft angedeuteten Drehmomentsensor am Antrieb;
• 13 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer alternativen Anbindung des ersten Teilgetriebes;
• 14 eine Prinzipansicht der zweiten Ausführungsvariante des Tretlagergetriebes mit der alternativen Anbindung des ersten Teilgetriebes;
• 15 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer alternativen Anbindung des zweiten Teilgetriebes;
• 16 eine Prinzipansicht der zweiten Ausführungsvariante des Tretlagergetriebes mit der alternativen Anbindung des zweiten Teilgetriebes;
• 17 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit einer beispielhaft am Antrieb angebundenen elektrischen Maschine;
• 18 eine Prinzipansicht der ersten Ausführungsvariante des Tretlagergetriebes mit der beispielhaft am Abtrieb angebundenen elektrischen Maschine;
• 19 eine Prinzipansicht der zweiten Ausführungsvariante des Tretlagergetriebes mit der beispielhaft am Antrieb angebundenen elektrischen Maschine;
• 20 eine Prinzipansicht der zweiten Ausführungsvariante des Tretlagergetriebes mit der beispielhaft am Abtrieb angebundenen elektrischen Maschine; und
• 21 ein Schaltschema mit den schaltbaren Gänge bei dem erfindungsgemäßen Tretlagergetriebe gemäß 1 bis 20.

Show it:

• 1 a basic view of a first embodiment variant of a bottom bracket gear according to the invention of a bicycle or pedelec with a first partial transmission connected to the drive and a downstream second partial transmission with a first blocking variant in the first partial transmission and the second partial transmission;
• 2 a schematic view of a second embodiment variant of the bottom bracket gear with the second sub-gearbox connected to the drive and the downstream first sub-gearbox with the first blocking variant in the first sub-gearbox and the second sub-gearbox;
• 3 a schematic view of the first embodiment variant of the bottom bracket gear with a second blocking variant in the first partial transmission and the first blocking variant in the second partial transmission;
• 4 a schematic view of the first embodiment variant of the bottom bracket gear with a third blocking variant in the first partial transmission and the first blocking variant in the second partial transmission;
• 5 a schematic view of the first embodiment variant of the bottom bracket gear with a fourth locking variant in the first sub-transmission and the first locking variant in the second sub-transmission;
• 6 a schematic view of the first embodiment variant of the bottom bracket gear with a fifth locking variant in the first sub-transmission and the first locking variant in the second sub-transmission;
• 7 a schematic view of the first embodiment variant of the bottom bracket gear with a sixth locking variant in the first sub-transmission and the first locking variant in the second sub-transmission;
• 8th a schematic view of the first embodiment variant of the bottom bracket gear with the first blocking variant in the first partial transmission and a first blocking variant in the second partial transmission;
• 9 a schematic view of the first embodiment variant of the bottom bracket gear with the first blocking variant in the first partial transmission and a second blocking variant in the second partial transmission;
• 10 a schematic view of the first embodiment variant of the bottom bracket gear with a third planetary gear set designed as a plus planetary gear set;
• 11 a schematic view of the first embodiment variant of the bottom bracket gear with an exemplary indicated torque sensor on the drive;
• 12 a schematic view of the second embodiment variant of the bottom bracket gear with an exemplary indicated torque sensor on the drive;
• 13 a schematic view of the first embodiment variant of the bottom bracket gear with an alternative connection of the first partial gear;
• 14 a schematic view of the second embodiment variant of the bottom bracket gear with the alternative connection of the first partial gear;
• 15 a schematic view of the first embodiment variant of the bottom bracket gear with an alternative connection of the second partial gear;
• 16 a schematic view of the second embodiment variant of the bottom bracket gear with the alternative connection of the second partial gear;
• 17 a schematic view of the first embodiment variant of the bottom bracket gear with an example of an electric machine connected to the drive;
• 18 a schematic view of the first embodiment variant of the bottom bracket gear with the electric machine connected to the output, for example;
• 19 a schematic view of the second embodiment variant of the bottom bracket gear with the electric machine connected to the drive, for example;
• 20 a schematic view of the second embodiment variant of the bottom bracket gear with the electric machine connected to the output, for example; and
• 21 a switching diagram with the switchable gears in the bottom bracket gear according to the invention 1 until 20 .

In the 1 until 20 Various embodiments are shown merely by way of example based on schematic principle views of a first embodiment variant and a second embodiment variant of a bottom bracket gear according to the invention in planetary design of a bicycle or a pedelec 1. 1 shows the schematically indicated bicycle or Pedelec 1 with the bottom bracket gear.

Regardless of the design variants, the bottom bracket gear in a housing or bottom bracket housing 2 includes a pedal crankshaft or pedal crank Wan as a drive with the pedals and a transmission output shaft Wab as an output with a chain or belt wheel, not shown. Furthermore, four further shafts W1, W2, W3, W3, W4 ^I are provided, which are coupled or connected to elements of the three planetary gear sets RS1, RS2, RS3. The elements of the first planetary gear set RS1 and the second planetary gear set RS2 as well as the third planetary gear set RS3 are arranged coaxially with the pedal crankshaft Wan. There are also five switching elements B1, B2, B3, F1, F1 I, F1 ^II , F1 ^III , F1 ^IV , F ^V , ^F2 , F2 ^I , F2 ^II to realize six gears V1, V2, V3, V4, V5, V6 intended. The first switching element B1 and the second switching element B2 as well as the third switching element B3 are each designed as switchable brakes, while the fourth switching element F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V and the fifth switching element F2, F2 ^I , F2 ^II are each designed as non-switchable freewheels.

Furthermore, it is provided that a first sub-transmission with a first planetary gear set RS1 and a second planetary gear set RS2 is provided, the first sub-transmission being provided with a first switching element B1, a second switching element B2 and a fourth switching element F1, F1 ^I , F1 ^II , F1 ^III , F1 ^{IV _ _ _} of the first planetary gear set zes RS1 or the second planetary gear set RS2 or an element of the first planetary gear set RS1 can be connected to one another with an element of the second planetary gear set RS2 via the fourth switching element F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V and that for blocking the second Partial transmission two elements of the third planetary gear set RS3 can be connected to one another via the fifth switching element F2, F2 ^I , F2 ^II .

To connect the two partial transmissions to the drive and the output, in the first embodiment variant 1 provided that the pedal crankshaft Wan is connected to a second element of the second planetary gear set RS2 and to a third element of the first planetary gear set RS1, that the transmission output shaft Wab is connected to a third element of the third planetary gear set RS3, that a second element of the first planetary gear set RS1 via a second shaft W2 is connected to a first element of the second planetary gear set RS2, and that a third element of the second planetary gear set RS2 is connected via a fourth shaft W4 to a second element of the third planetary gear set RS3.

To connect the two partial transmissions to the drive and the output, the second embodiment variant is as follows 2 provided that the pedal crankshaft Wan is connected to a second element of the third planetary gear set RS3, that the transmission output shaft Wab is connected to a third element of the second planetary gear set RS2, that a third element of the third planetary gear set RS3 is connected to a second element via a fourth shaft W4 ^I of the second planetary gear set RS2 and is connected to a third element of the first planetary gear set RS1, and that a first element of the second planetary gear set RS2 is connected via a second shaft W2 to a second element of the first planetary gear set RS1.

Regardless of the embodiment variants, it is provided that when the first switching element B1 is closed, a first shaft W1 connected to a first element of the first planetary gear set RS1 is connected to the housing 2, that when the second switching element B2 is closed, one is connected to the second element of the first planetary gear set RS1 and with the second shaft W2 connected to the first element of the second planetary gear set RS2 is connected to the housing 2 and that when the third switching element B3 is closed, a third shaft W3 connected to a first element of the third planetary gear set RS3 is connected to the housing 2.

With the above-described connection of the elements of the planetary gear sets RS1, RS2, RS3 and the shafts Wan, Wab, W1, W2, W3, W3, W4 ^I as well as the switching elements B1, B2, B3, F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V , F2, F2 ^I , F2 ^II results in a particularly space-saving design of the bottom bracket gear.

In the 1 until 9 and 11 until 20 The three planned planetary gear sets RS1, RS2, RS3 are each designed as space-saving minus planetary gear sets. It is provided here that a sun gear SR1, SR2, SR3 is provided as the first element or gear set element, a planet gear carrier PT1, PT2, PT3 as a second element and a ring gear HR1, HR2, HR3 as a third element in the planetary gear sets RS1, RS2, RS3 are.

The details of the first embodiment variant are as follows 1 with a first blocking variant in the first planetary gear set RS1 or in the first partial transmission and with a first blocking variant in the third planetary gear set RS3 or in the second partial transmission, that the pedal crankshaft Wan with the planet gear carrier PT2 of the second planetary gear set RS2 and with the ring gear HR1 of the first planetary gear set RS1 is connected. The transmission output shaft Wab is connected to the ring gear HR3 of the third planetary gear set RS3. The planetary gear carrier PT1 of the first planetary gear set RS1 is connected to the sun gear SR2 of the second planetary gear set RS2 via the second shaft W2. The ring gear HR2 of the second planetary gear set RS2 is connected to the planet gear carrier PT3 of the third planetary gear set RS3 via the fourth shaft W4.

The details of the second embodiment variant are as follows 2 with the first blocking variant of the first partial transmission and the first blocking variant of the second partial transmission, that the pedal crankshaft Wan is connected to the planetary gear carrier PT3 of the third planetary gearset RS3. The transmission output shaft Wab is connected to the ring gear HR2 of the second planetary gear set RS2. The ring gear HR3 of the third planetary gear set RS3 is connected via the fourth shaft W4 ^I to the planet gear carrier PT2 of the second planetary gear set RS2 and the ring gear HR1 of the first planetary gear set RS1. The sun gear SR2 of the second planetary gear set RS2 is connected to the planet gear carrier PT1 of the first planetary gear set RS1 via the second shaft W2.

In the first and second embodiment variants according to 1 and 2 It follows that when the first switching element B1, designed as a brake, is closed, the first shaft W1, which is connected to the sun gear SR1 of the first planetary gear set RS1, is connected to the housing 2. When the second switching element B2, designed as a brake, is closed, the one with the sun gear SR2 of the second planetary gear set RS2 and the second shaft W2 connected to the planet gear carrier PT1 of the first planetary gear set RS1 is connected to the housing 2. When the third switching element B3, designed as a brake, is closed, the third shaft W3, which is connected to the sun gear SR3 of the third planetary gear set RS3, is connected to the housing 2. In the first blocking variant of the first partial transmission, the sun gear SR1 is connected to the ring gear HR1 when the fourth switching element F1, designed as a freewheel, is locked. In the first blocking variant of the second partial transmission, the sun gear SR3 of the third planetary gear set RS3 is connected to the ring gear HR3 of the third planetary gear set RS3 when the fifth switching element F2, designed as a freewheel, is locked.

The ones in the 3 until 9 The various blocking variants shown in the first sub-gear or in the first and second planetary gear set RS1, RS2 and in the second sub-gear or in the third planetary gear set RS3 are shown by way of example using the first embodiment variant of the bottom bracket gear. The different blocking variants can be transferred analogously to the second embodiment variant of the bottom bracket gear.

In 3 a second blocking variant of the first partial transmission or the second planetary gear set RS2 is shown as an example based on the first embodiment variant of the bottom bracket gear, in which the sun gear SR2 of the second planetary gear set RS2 in the locked state of the fourth switching element F1 ^I, which is designed as a freewheel, with the planet gear carrier PT2 of the second planetary gear set RS2 is connected.

In 4 a third blocking variant of the first partial transmission or the second planetary gear set RS2 is shown as an example based on the first embodiment variant of the bottom bracket gear, in which the planetary gear carrier PT2 of the second planetary gear set RS2 in the locked state of the fourth switching element F1 ^II, which is designed as a freewheel, with the ring gear HR2 of the second planetary gear set RS2 is connected.

In 5 a fourth blocking variant of the first partial transmission or the first planetary gear set RS1 is shown as an example based on the first embodiment variant of the bottom bracket gear, in which the sun gear SR1 of the first planetary gear set RS1 is in the locked state of the fourth switching element F1 ^III , which is designed as a freewheel, with the planet gear carrier PT1 of the first planetary gear set RS1 is connected.

In 6 a fifth blocking variant of the first partial transmission or the second planetary gear set RS2 is shown as an example based on the first embodiment variant of the bottom bracket gear, in which the sun gear SR2 of the second planetary gear set is connected to the ring gear HR2 of the second planetary gear set RS2 in the locked state of the fourth switching element F1 ^IV , which is designed as a freewheel becomes.

In 7 a sixth blocking variant of the first partial transmission is shown as an example based on the first embodiment variant of the bottom bracket transmission, in which the sun gear SR1 of the first planetary gear set RS1 is connected to the ring gear HR2 of the second planetary gear set RS2 via the fourth switching element F1 ^V.

In the 3 until 7 The first blocking variant of the second partial transmission or the third planetary gear set RS3 is shown as an example.

In 8th a second blocking variant of the second partial transmission or the third planetary gear set RS3 is shown as an example based on the first embodiment variant of the bottom bracket gear, in which the sun gear SR3 of the third planetary gear set RS3 is in the locked state of the fifth switching element F2 ^I, which is designed as a freewheel, with the planet gear carrier PT3 of the third planetary gear set RS3 is connected.

In 9 a third blocking variant of the second partial transmission or the third planetary gear set RS3 is shown as an example based on the first embodiment variant of the bottom bracket gear, in which the ring gear HR3 of the third planetary gear set RS3 in the locked state of the fifth switching element F2 ^II, which is designed as a freewheel, with the planet gear carrier PT3 of the third planetary gear set RS3 is connected.

In the 8th and 9 The first blocking variant of the first partial transmission is shown as an example.

In 10 an embodiment of the bottom bracket gear with a plus planetary gear set is shown as an example using the first embodiment variant of the bottom bracket gear. This version can be transferred analogously to the second embodiment variant of the bottom bracket gear. When using a plus planetary gear set, the ring gear connection and planetary gear carrier connection are swapped. When using a plus planetary gear set, there is greater flexibility in the choice of gear ratios. For example, a current translation of e.g. E.g. i0 = -2.0 a standard gear ratio i0 = +3.0.

In 10 For example, the third planetary gear set RS3 is designed as a plus planetary gear set, while the first planetary gear set RS1 and the second planetary gear set RS2 are each designed as a minus planetary gear set. It is possible that the other planetary gear sets RS1, RS2 can also be designed as plus planetary gear sets.

In 11 the first embodiment variant of the bottom bracket gear according to the invention is shown, in which a torque sensor 3 is connected or can be connected to the pedal crankshaft Wan. For example, a disk-shaped torque sensor 3 can be arranged at the transmission input. However, the torque sensor 3 can also be designed in another way.

In 12 the second embodiment variant of the bottom bracket gear according to the invention with the torque sensor 3 on the pedal crankshaft Wan is shown as an example.

In the 13 and 14 an alternative connection of the first partial transmission with the first planetary gear set RS1 and the second planetary gear set RS2 is shown as an example. 13 shows the alternative connection using the first embodiment variant of the bottom bracket gear, while 14 shows the alternative connection using the second embodiment variant of the bottom bracket gear. Just an example is in 13 and 14 the fourth blocking variant of the first partial transmission and the first blocking variant of the second partial transmission are shown. It is conceivable that other blocking variants can also be used.

The alternative connection of the first partial transmission provides that the first switching element B1, designed as a brake, and the second switching element B2, designed as a brake, can be arranged in the plane of the drawing to the right of the first and second planetary gear sets RS1, RS2. The connections of the elements remain identical.

In the 15 and 16 an alternative connection of the second partial transmission with the third planetary gear set RS3 is shown as an example. 15 shows the alternative connection using the first embodiment variant of the bottom bracket gear, while 16 shows the alternative connection using the second embodiment variant of the bottom bracket gear. Just an example is in the 15 and 16 The first blocking variant is shown in the first partial transmission and the second partial transmission. It is also possible to use other blocking variants.

In the alternative connection of the second partial transmission, it is provided that the switching element B3, designed as a brake, is arranged in the plane of the drawing to the left of the third planetary gear set RS3 and the planetary gear carrier PT3 is connected via a hollow shaft or the like below the third planetary gear set RS3. The connections of the elements remain identical.

In the 17 and 18 The first embodiment variant of the bottom bracket gear according to the invention is shown with an additional electric machine EM. The electric machine EM can be connected to the pedal crankshaft Wan, as shown in 17 is indicated. It is also conceivable that the electric machine EM is connected to the transmission output shaft Wab, as shown in 18 is shown. The electric machine EM is preferably arranged axially parallel to the pedal crankshaft Wan. However, a coaxial arrangement of the electric machine EM to the pedal crankshaft Wan would also be possible. Regardless, it is advantageous to connect the electrical machine EM via a freewheel or the like, so that no losses are caused by the co-rotating electrical machine EM when operating without the electrical machine EM.

In 19 the second embodiment variant of the bottom bracket gear according to the invention is shown with the electric machine EM on the drive, while in 20 the second embodiment variant of the bottom bracket gear with the electric machine EM on the output is shown.

In 21 is an example of a circuit diagram for the ones in the 1 until 20 shown versions of the bottom bracket gear according to the invention. The switching diagram shows the switching elements B1, B2, B3, F1, F1 I, F1 ^II , F1 ^III , F1 ^IV , F2, F2 ^I , F2 ^II used for the respective gear V1, V2, ^V3 , V4, V5, V6 . ^{Here , an _ _ _} This works automatically without any external action. Furthermore, an X for a brake B1, B2, B3 as a switching element in the switching diagram means that the brake B1, B2, B3 is closed. This works via suitable actuators.

The details can be seen from the circuit diagram 21 that in order to realize a first gear V1, the fourth switching element F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , designed as a freewheel, and the fifth switching element F2, F2 ^I , F2 ^II , designed as a freewheel, are locked, that in order to realize a second gear V2, the first switching element B1, designed as a brake, is closed and the fifth switching element F2, F2 ^I , F2 ^II , designed as a freewheel, is locked, so that to achieve a third gear V3, the second switching element B2, designed as a brake, is closed and the fifth switching element F2, F2 ^I , F2 ^II designed as a freewheel is locked, so that to achieve a fourth gear V4, the third switching element B3 designed as a brake is closed and the fourth switching element F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV designed as a freewheel is closed is blocked, that to realize a fifth gear V5, the first switching element B1 designed as a brake and the third switching element B3 designed as a brake are closed and / or that to realize a sixth gear V6, the second switching element B2 designed as a brake and the third designed as a brake Switching element B3 is closed.

Reference symbols

1

Bicycle or a Pedelec

2

Housing or bottom bracket housing

3

Torque sensor

SR1

Sun gear of the first planetary gear set

PT1

Planetary gear carrier of the first planetary gear set

HR1

Ring gear of the first planetary gear set

SR2

Sun gear of the second planetary gear set

PT2

Planetary gear carrier of the second planetary gear set

HR2

Ring gear of the second planetary gear set

SR3

Sun gear of the third planetary gear set

PT3

Planetary gear carrier of the third planetary gear set

HR3

Ring gear of the third planetary gear set

Wan

pedal crankshaft

Wow

Transmission output shaft

E.M

electric machine

W1

first wave

W2

second wave

W3

third wave

W4, W4I

fourth wave

RS1

first planetary gear set

RS2

second planetary gear set

RS3

third planetary gear set

B1

first switching element as a brake

B2

second switching element as a brake

B3

third switching element as a brake

F1, F1I, F1II, F1III, F1IV, FV

fourth switching element as a freewheel

F2, F2I, F2II

fifth switching element as a freewheel

V1

first course

V2

second gear

V3

third gear

V4

fourth gear

V5

fifth gear

V6

sixth gear

Claims (23)

Bottom bracket gearbox in planetary design for a bicycle or a pedelec (1), with a pedal crankshaft (Wan) as a drive and a transmission output shaft (Wab) as an output and at least four further shafts (W1, W2, W3, W3 ^I , W4), with three planetary gear sets (RS1, RS2, RS3), which are arranged coaxially to the pedal crankshaft (Wan), and with five switching elements (B1, B2, B3, F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V , F2, F2 ^I , F2 ^II ,) for realizing at least six gears (V1, V2, V3, V4, V5, V6), characterized in that a first sub-transmission with a first planetary gear set (RS1) and a second planetary gear set (RS2) is provided, where A first switching element (B1), a second switching element (B2) and a fourth switching element (F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V ) are assigned to the first partial transmission, that a second partial transmission with a third planetary gear set ( RS3) is provided, wherein the second partial transmission is assigned a third switching element (B3) and a fifth switching element (F2, F2 ^I , F2 ^II ) that for blocking the first partial transmission two elements of the first planetary gear set (RS1) or the second planetary gear set ( RS2) or an element of the first planetary gear set (RS1) with an element of the second planetary gear set (RS2) via the fourth switching element (F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V ) can be connected to one another and that for blocking the second partial transmission, two elements of the third planetary gear set (RS3) can be connected to one another via the fifth switching element (F2, F2 ^I , F2 ^II ). Bottom bracket gear Claim 1 , characterized in that the pedal crankshaft (Wan) is connected to a second element of the second planetary gear set (RS2) and to a third element of the first planetary gear set (RS1), that the transmission output shaft (Wab) is connected to a third element of the third planetary gear set (RS3) is connected in that a second element of the first planetary gear set (RS1) is connected to a first element of the second planetary gear set (RS2) via a second shaft (W2), and that a third element of the second planetary gear set (RS2) is connected via a fourth shaft (W4 ) is connected to a second element of the third planetary gear set (RS3). Bottom bracket gear Claim 1 , characterized in that the pedal crankshaft (Wan) is connected to a second element of the third planetary gear set (RS3), that the transmission output shaft (Wab) is connected to a third element of the second planetary gear set (RS2), that a third element of the third planetary gear set ( RS3) is connected via a fourth shaft (W4 ^I ) to a second element of the second planetary gear set (RS2) and to a third element of the first planetary gear set (RS1), and that a first element of the second planetary gear set (RS2) via a second shaft ( W2) is connected to a second element of the first planetary gear set (RS1). Bottom bracket gear according to one of the preceding claims, characterized in that when the first switching element (B1) is closed, a first shaft (W1) connected to a first element of the first planetary gear set (RS1) is connected to a housing (2), that when the second switching element (B1) is closed ( B2) a second shaft (W2) connected to the second element of the first planetary gear set (RS1) and to the first element of the second planetary gear set (RS2) is connected to the housing (2) and that when the third switching element (B3) is closed, one with a The third shaft (W3) connected to the first element of the third planetary gear set (RS3) is connected to the housing (2). Bottom bracket gear according to one of the preceding claims, characterized in that the first switching element (B1), the second switching element (B2) and the third switching element (B3) are each designed as a positive brake and / or that the fourth switching element (F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V ) and the fifth switching element (F2, F2 ^I , F2 ^II ) are each designed as a freewheel. Bottom bracket gear according to one of the preceding claims, characterized in that for blocking the first partial transmission, the element of the first planetary gear set (RS1) can be connected to the third element of the first planetary gear set (RS1) via the fourth switching element (F1). Bottom bracket gear according to one of the Claims 1 until 5 , characterized in that for blocking the first partial transmission, the first element of the second planetary gear set (RS2) can be connected to the second element of the second planetary gear set (RS2) via the fourth switching element (F1 ^I ). Bottom bracket gear according to one of the Claims 1 until 5 , characterized in that in order to lock the first partial transmission, the second element of the second planetary gear set (RS2) can be connected to the third element of the second planetary gear set (RS2) via the fourth switching element (F1 ^II ). Bottom bracket gear according to one of the Claims 1 until 5 , characterized in that for blocking the first partial transmission, the first element of the first planetary gear set (RS1) can be connected to the second element of the first planetary gear set (RS1) via the fourth switching element (F1 ^III ). Bottom bracket gear according to one of the Claims 1 until 5 , characterized in that for blocking the first partial transmission, the first element of the second planetary gear set (RS2) can be connected to the third element of the second planetary gear set (RS2) via the fourth switching element (F1 ^IV ). Bottom bracket gear according to one of the Claims 1 until 5 , characterized in that for blocking the first partial transmission, the first element of the first planetary gear set (RS1) can be connected to the third element of the second planetary gear set (RS2) via the fourth switching element (F1 ^V ). Bottom bracket gear according to one of the preceding claims, characterized in that in order to lock the second partial transmission, the first element of the third planetary gear set (RS3) can be connected to the third element of the third planetary gear set (RS3) via the fifth switching element (F2). Bottom bracket gear according to one of the Claims 1 until 11 , characterized in that the first element is used to block the second partial transmission of the third planetary gear set (RS3) can be connected to the second element of the third planetary gear set (RS3) via the fifth switching element (F2 ^I ). Bottom bracket gear according to one of the Claims 1 until 11 , characterized in that to lock the second partial transmission, the second element of the third planetary gear set (RS3) can be connected to the third element of the third planetary gear set (RS3) via the fifth switching element (F2 ^II ). Bottom bracket gear according to one of the preceding claims, characterized in that at least one of the planetary gear sets (RS1, RS2, RS3) is designed as a minus planetary gear set. Bottom bracket gear Claim 15 , characterized in that in a minus planetary gear set, the first element is designed as a sun gear (SR1, SR2, SR3), the second element as a planetary gear carrier (PT1, PT2, PT3) and the third element as a ring gear (HR1, HR2, HR3). . Bottom bracket gear according to one of the preceding claims, characterized in that at least one of the planetary gear sets (RS1, RS2, RS3) is designed as a plus planetary gear set. Bottom bracket gear Claim 17 , characterized in that in a plus planetary gear set, the first element is designed as a sun gear (SR1, SR2, SR3), the second element as a ring gear (HR1, HR2, HR3) and the third element as a planetary gear carrier (PT1, PT2, PT3). . Bottom bracket gear according to one of the preceding claims, characterized in that a torque sensor (3) is connected to the pedal crankshaft (Wan). Bottom bracket gear according to one of the preceding claims, characterized in that at least one electric machine (EM) is connected or connectable to the pedal crankshaft (Wan) or to the transmission output shaft (Wab). Bottom bracket gear Claim 20 , characterized in that the electric machine (EM) is arranged axially parallel to the pedal crankshaft (Wan). Bottom bracket gear according to one of the preceding claims, characterized in that to achieve a first gear (V1), the fourth switching element (F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V ) designed as a freewheel and the fifth switching element designed as a freewheel (F2, F2 ^I , F2 ^II ) are locked, that in order to achieve a second gear (V2), the first switching element (B1) designed as a brake is closed and the fifth switching element (F2, F2 ^I , F2 ^II ) designed as a freewheel is locked that to achieve a third gear (V3), the second switching element (B2) designed as a brake is closed and the fifth switching element (F2, F2 ^I , F2 ^II ) designed as a freewheel is locked, that to realize a fourth gear (V4). The third switching element (B3), designed as a brake, is closed and the fourth switching element (F1, F1 ^I , F1 ^II , F1 ^III , F1 ^IV , F ^V ), designed as a freewheel, is locked so that the first is used as a fifth gear (V5). The switching element (B1) designed as a brake and the third switching element (B3) designed as a brake are closed and/or in order to achieve a sixth gear (V6), the second switching element (B2) designed as a brake and the third switching element (B3) designed as a brake are closed are. Bicycle or pedelec (1) with the bottom bracket gear according to one of the preceding claims.

Images