Power shift transmission, method of operating the same and bicycle having a power shift transmission
A power shift transmission for a vehicle driveable by motor power and/or pedal power may include a transmission device which transmits a torque introducible on a drive in a transmission ratio settable via a plurality of gears to an output. The power shift transmission may also include two shifting devices via which the transmission device is shiftable for setting the transmission ratio of the transmission device.
1 . A power shift transmission for a vehicle driveable by motor power and/or pedal power, comprising:
a transmission device which transmits a torque introducible on a drive in a transmission ratio settable via a plurality of gears to an output, the transmission device including a load freewheel and at least two shiftable planetary gear sets that are coupled to one another via the load freewheel; and
two shifting devices via which the transmission device is shiftable for setting the transmission ratio of the transmission device.
2 . The power shift transmission according to claim 1 , wherein the two shifting devices are separate components and are at least one of controllable and regulatable.
3 . The power shift transmission according to claim 1 , further comprising a clutch, wherein the two shifting devices includes:
a first shifting device that directly shifts a first planetary gear set of the at least two planetary gear sets; and
a second shifting device that indirectly shifts, via the clutch, the first planetary gear set and/or a second planetary gear set of the at least two planetary gear sets.
4 . The power shift transmission according to claim 1 , wherein:
the drive includes a drive shaft for introducing the torque introduced on a drive side on which a hollow output shaft forming the output is mounted in a rotatably adjustable manner;
the drive shaft having a main extension direction and defining, in the main extension direction, a centre longitudinal axis; and
the at least two planetary gear sets are:
arranged axially in series with respect to the centre longitudinal axis such that one planetary gear set of the at least two planetary gear sets is arranged on the drive side and the other planetary gear set of the at least two planetary gear sets is arranged on an output side;
arranged coaxially with respect to the centre longitudinal axis; and/or
directly and/or indirectly mounted on the drive shaft and/or the hollow output shaft in a rotatably adjustable manner.
5 . The power shift transmission according to claim 4 , wherein:
a drive-side planetary gear set of the at least two planetary gear sets is coupled to the drive shaft and includes at least one central sun gear, a planet gear stage, and a ring gear;
the ring gear is assigned a freewheel;
the ring gear is coupled via the freewheel to the drive shaft dependent on a direction of rotation; and
the drive-side planetary gear set is formed by:
a simple planetary gear; or
a reduced planetary gear including two central sun gears.
6 . The power shift transmission according to claim 4 , wherein an output-side planetary gear set of the at least two planetary gear sets is coupled to the hollow output shaft and is formed by:
a simple planetary gear including a central sun gear, a planet gear stage, and a ring gear; or
a double planetary gear including two simple planet gears coupled to one another.
7 . The power shift transmission according to claim 1 , wherein the two shifting devices, with respect to the transmission device, are separate components.
8 . The power shift transmission according to claim 1 , wherein:
the two shifting devices each include a load gear wheel, an actuatable multiple-disc braking device for braking and/or fixing the load gear wheel, and a freewheel device for coupling the load gear wheel dependent on a direction of rotation; and/or
the two shifting devices are arranged on a transmission housing and/or fixed in place at least with respect to the transmission housing.
9 . The power shift transmission according to claim 8 , wherein:
the load gear wheel of a first shifting device of the two shifting devices meshes with an external toothing of a first planetary gear set of the at least two planetary gear sets;
the external toothing is arranged on a ring gear of the first planetary gear set, the first planetary gear set arranged on a drive side and formed by a simple planetary gear or a reduced planetary gear; and/or
the ring gear is positively fixable via the first shifting device and/or at least fixed in a single set transmission ratio of the transmission device.
10 . The power shift transmission according to claim 8 , further comprising a clutch, wherein:
the load gear wheel of a shifting device of the two shifting devices meshes with a driver gear wheel of the clutch; and/or
the driver gear wheel, via the shifting device, is (i) fixed in an axial position viewed with respect to a centre longitudinal axis of a drive shaft of the drive and positively fixable on a circumferential side with respect to the centre longitudinal axis and/or (ii) fixed at least in a single set transmission ratio of the transmission device.
11 . The power shift transmission according to claim 1 , further comprising a clutch, wherein one shifting device of the two shifting devices interacts directly with the transmission device and the other shifting device of the two shifting devices interacts indirectly with the transmission device via the clutch, and wherein:
the clutch includes a driver gear wheel and two actuatable claw ring discs arranged in a non-rotatable and longitudinally moveable manner on opposite sides of the driver gear wheel such that a torque introduced on the two claw ring discs is transmittable to the driver gear wheel and/or another torque introduced on the driver gear wheel is transmittable to the two claw ring discs;
the clutch is arranged axially with respect to a centre longitudinal axis extending between the at least two planetary gear sets; and/or
the clutch is mounted in a rotatably adjustable manner via a sun gear of an output-side planetary gear set of the at least two planetary gear sets on an output-side planetary gear set.
12 . The power shift transmission according to claim 11 , wherein:
a first claw ring disc of the two claw ring discs facing a drive-side planetary gear set of the at least two planetary gear sets is moveable back and forth between a disengaged coupling position, in which the first claw ring disc touchingly and without slip lies against a planet gear stage of the drive-side planetary gear set, and an engaged basic position disposed spaced apart longitudinally in this respect, in which the first claw ring disc is contact-free and disposed spaced apart relative to the planet gear stage of the drive-side planetary gear set and touchingly and without slip lies against a sun gear of the drive-side planetary gear set; and/or
a second claw ring disc of the two claw ring discs facing the output-side planetary gear set is moveable back and forth between a disengaged coupling position, in which the second claw ring disc touchingly and without slip lies against a ring gear of the output-side planetary gear set, and an engaged basic position disposed longitudinally spaced apart in this regard, in which the second claw ring disc is contact-free and disposed spaced apart relative to the ring gear of the output-side planetary gear set and touchingly and without slip lies against the sun gear of the output-side planetary gear set.
13 . A method for operating a power shift transmission for a vehicle driveable by motor power and/or pedal power, the power shift transmission including a transmission device which transmits a torque introducible on a drive in a transmission ratio settable via a plurality of gears to an output, and two shifting devices via which the transmission device is shiftable for setting the transmission ratio of the transmission device, the method comprising:
providing the power shift transmission in and/or with an initially pre-set transmission ratio of the transmission device;
setting the transmission ratio of the transmission device to a transmission ratio differing from the initially pre-set transmission ratio via the two shifting devices; and
wherein the method further comprises:
actuating a first shifting device of the two shifting devices to directly fix and/or release a ring gear of a drive-side planetary gear set of the power shift transmission; and/or
actuating a second shifting device of the two shifting devices to (i) fix and/or release a sun gear of the drive-side planetary gear set indirectly via a clutch, (ii) fix and/or release a sun gear of an output-side planetary gear set of the power shift transmission, and/or (iii) fix and/or release a ring gear of the output-side planetary gear set.
14 . A bicycle, comprising a drive train including at least one power shift transmission according to claim 1 .
15 . The power shift transmission according to claim 1 , further comprising a clutch, wherein:
the at least two planetary gear sets includes a drive-side planetary gear set and an output-side planetary gear set;
the clutch includes:
a driver gear wheel;
two actuatable claw ring discs arranged in a non-rotatable and longitudinally moveable manner on opposite sides of the driver gear wheel; and
a resetting device for actuating the two claw ring discs;
the two claw ring discs includes (i) a first claw ring disc facing the drive-side planetary gear set and (ii) a second claw ring disc facing the output-side planetary gear set;
the first claw ring disc is moveable back and forth between (i) a disengaged coupling position, in which the first claw ring disc touchingly and without slip lies against a planet gear stage of the drive-side planetary gear set, and (ii) an engaged basic position, in which the first claw ring disc is contact-free and disposed spaced apart relative to the planet gear stage of the drive-side planetary gear set and touchingly and without slip lies against a sun gear of the drive-side planetary gear set; and
the second claw ring disc is moveable back and forth between (i) a disengaged coupling position, in which the second claw ring disc touchingly and without slip lies against a ring gear of the output-side planetary gear set, and (ii) an engaged basic position, in which the second claw ring disc is contact-free and disposed spaced apart relative to the ring gear of the output-side planetary gear set and touchingly and without slip lies against a sun gear of the output-side planetary gear set.
16 . The power shift transmission according to claim 15 , wherein the resetting device is a shifting fork.
17 . A power shift transmission for a vehicle driveable by motor power and/or pedal power, comprising:
a transmission device which transmits a torque introducible on a drive in a transmission ratio settable via a plurality of gears to an output; and
two shifting devices via which the transmission device is shiftable for setting the transmission ratio of the transmission device;
wherein the two shifting devices each include:
a load gear wheel;
an actuatable multiple-disc braking device for braking and/or fixing the load gear wheel; and
a freewheel device for coupling the load gear wheel dependent on a direction of rotation.
18 . The power shift transmission according to claim 17 , wherein:
the transmission device includes four planetary gear sets; and
the four planetary gear sets are:
each configured as a simple planetary gear set;
arranged with respect to a centre longitudinal axis coaxially and in series; and/or
completely engage all around the drive, which is a drive shaft having a main extension direction and defining, in the main extension direction, the centre longitudinal axis.
19 . The power shift transmission according to claim 18 , wherein the four planetary gear sets includes a first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set, and wherein:
axially with respect to the centre longitudinal axis, between the first planetary gear set and the second planetary gear set axially directly adjacent in this regard, a clutch is arranged, the clutch including three separately actuatable shifting elements, a clutch freewheel, and an annular clutch part, the clutch configured to connect the first planetary gear set to the remaining planetary gear sets of the four planetary gear sets;
a first shifting device of the two shifting devices is directly connectable to the clutch part of the clutch; and/or
a second shifting device of the two shifting devices is directly connectable to a planet gear stage of the fourth planetary gear set and indirectly connectable to the output via a freewheel.
20 . The power shift transmission according to claim 17 , wherein the transmission device includes three planetary gear sets; wherein the three planetary gear sets are: arranged with respect to a centre longitudinal axis coaxially and in series and completely engage all around the drive, which is a drive shaft having a main extension direction and defining, in the main extension direction, the centre longitudinal axis; and wherein:
axially with respect to the centre longitudinal axis between a first planetary gear set of the three planetary gear sets and a second planetary gear set of the three planetary gear sets axially directly adjacent in this regard, a clutch is arranged, the clutch including two separately actuatable shifting elements and an annular clutch part;
a first shifting device of the two shifting devices is connectable directly to a plurality of planet gears of the second planetary gear set and, via a freewheel, to a central hollow shaft; and/or
a second shifting device of the two shifting devices is connectable to a ring gear of a third planetary gear set of the three planetary gear sets and, via a further freewheel, to the central hollow shaft.