Power split transmission
AssigneeZF Friedrichshafen AG
InventorJurgen Legner
Life of this patent
Estimating the term…
Abstract
A power split transmission for a working machine, such as a wheel loader, having a continuously variable power branch and a mechanical power branch that are summed with one another via a summing gear (13). The summing gear (13) can be connected, via a clutch for forward drive (4) and a clutch for reverse drive (8), to an input drive. The power split transmission has shafts (2, 7; 32, 33) and only a single clutch is located on each shaft.
Claims10
A power split transmission comprising a continuously variable branch and a mechanical branch, the continuously variable and the mechanical branches being summed with one another by a summing gear set (13) designed as a planetary gear set, the transmission having at least first and second operating ranges that can be switched via first and second operating range clutches (26, 29), and a forward drive clutch (4) and a reverse drive clutch (8), and shafts (32, 33) on which gears (27, 25, 28, 30) and the first and the second operating range clutches (26, 29) being supported, only one of the clutches (4, 8;
- 26, 29) being supported on each shaft (2, 7;
- 32, 33), and the shafts (2, 7;
- 32, 33) being positioned spaced apart from one another, the summing gear set (13) comprising a ring gear (15) and at least one double planetary gear (14) supported by a planet carrier (12) and engaged with the ring gear (15), and first and second sun gears (16, 17), and the planet carrier (12) being connected to an input drive (2) via the forward drive clutch (4) and the reverse drive clutch (8);
- and
- at least one consumer (10) is connected to a shaft (7) to which the reverse drive clutch (8) is connected.
A power split transmission comprising a continuously variable branch and a mechanical branch, the continuously variable and the mechanical branches being summed with one another by a summing gear set (13) designed as a planetary gear set, the transmission having at least first and second operating ranges that can be switched via first and second operating range clutches (26, 29), and a forward drive clutch (4) and a reverse drive clutch (8), and shafts (32, 33) on which gears (27, 25, 28, 30) and the first and the second operating range clutches (26, 29) being supported, only one of the clutches (4, 8;
- 26, 29) being supported on each shaft (2, 7;
- 32, 33), and the shafts (2, 7;
- 32, 33) being positioned spaced apart from one another, the summing gear set (13) comprising a ring gear (15) and at least one double planetary gear (14) supported by a planet carrier (12) and engaged with the ring gear (15), and first and second sun gears (16, 17), and the planet carrier (12) being connected to an input drive (2) via the forward drive clutch (4) and the reverse drive clutch (8);
- and
- the second sun gear (17) is in active connection with an output drive (23) via a third operating range clutch (34).
A power split transmission comprising a continuously variable branch and a mechanical branch, the continuously variable and the mechanical branches being summed with one another by a summing gear set (13) designed as a planetary gear set, the transmission having at least first and second operating ranges that can be switched via first and second operating range clutches (26, 29), and a forward drive clutch (4) and a reverse drive clutch (8), and shafts (32, 33) on which gears (27, 25, 28, 30) and the first and the second operating range clutches (26, 29) being supported, only one of the clutches (4, 8;
- 26, 29) being supported on each shaft (2, 7;
- 32, 33), and the shafts (2, 7;
- 32, 33) being positioned spaced apart from one another, the summing gear set (13) comprising a ring gear (15) and at least one double planetary gear (14) supported by a planet carrier (12) and engaged with the ring gear (15), and first and second sun gears (16, 17), and the planet carrier (12) being connected to an input drive (2) via the forward drive clutch (4) and the reverse drive clutch (8);
- and
- the second sun gear (17) is in active connection with an output drive (23) via a third operating range clutch (34).
A power split transmission comprising a continuously variable branch and a mechanical branch, the continuously variable and the mechanical branches being summed with one another by a summing gear set (13) designed as a planetary gear set, the transmission having at least first and second operating ranges that can be switched via first and second operating range clutches (26, 29), and a forward drive clutch (4) and a reverse drive clutch (8), and shafts (32, 33) on which gears (27, 25, 28, 30) and the first and the second operating range clutches (26, 29) being supported, only one of the clutches (4, 8;
- 26, 29) being supported on each shaft (2, 7;
- 32, 33), and the shafts (2, 7;
- 32, 33) being positioned spaced apart from one another, the summing gear set (13) comprising a ring gear (15) and at least one double planetary gear (14) supported by a planet carrier (12) and engaged with the ring gear (15), and first and second sun gears (16, 17), and the planet carrier (12) being connected to an input drive (2) via the forward drive clutch (4) and the reverse drive clutch (8);
- and
- gear ratios are such that, when shifting from the first operating range to the second operating range, the second operating range clutch (29) has a synchronous rotational speed.
A power split transmission comprising a continuously variable branch and a mechanical branch, the continuously variable and the mechanical branches being summed with one another by a summing gear set (13) designed as a planetary gear set, the transmission having at least first and second operating ranges that can be switched via first and second operating range clutches (26, 29), and a forward drive clutch (4) and a reverse drive clutch (8), and shafts (32, 33) on which gears (27, 25, 28, 30) and the first and the second operating range clutches (26, 29) being supported, only one of the clutches (4, 8;
- 26, 29) being supported on each shaft (2, 7;
- 32, 33), and the shafts (2, 7;
- 32, 33) being positioned spaced apart from one another, the summing gear set (13) comprising a ring gear (15) and at least one double planetary gear (14) supported by a planet carrier (12) and engaged with the ring gear (15), and first and second sun gears (16, 17), and the planet carrier (12) being connected to an input drive (2) via the forward drive clutch (4) and the reverse drive clutch (8);
- and
- the continuously variable power branch has two inclined axle hydraulic units which are adjustable through a common yoke.
A power split transmission comprising:
- a continuously variable branch and a mechanical branch being summed by a summing gear set (13), and the summing gear set (13) comprising a planetary gear set having at least first and second operating ranges;
- an input shaft (2) being coupled to a forward drive clutch (4) for implementing forward drive when the forward drive clutch (4) is engaged;
- a first shaft (7) being coupled to a reverse drive clutch (8) for implementing reverse drive when the reverse drive clutch (8) is engaged;
- a second shaft (32) supporting gears (25, 27) and being coupled to only a first operating range clutch (26);
- a third shaft (33) supporting gears (28, 30) and being coupled to only a second operating range clutch (29), and the third shaft (33) being spaced from the second shaft (32);
- each of the at least the first and the second operating ranges being implemented by engagement of one of the first and the second operating range clutches (26, 29) of the second and third shafts (32, 33) and disengaging the other of the second and the first operating range clutches (26, 29) of the second and third shafts (32, 33);
- and
- the summing gear set (13) comprising a ring gear (15), first and second sun gears (16, 17) and at least one double planet gear (14) which is rotatably supported by a planet carrier (12) and engages the ring gear (15), and the planet carrier (12) being connectable to the input shaft (2) via the reverse drive clutch (8) and the forward drive clutch (4).
Dependencies are inferred from the claim text.