Transmission system
AssigneeKomatsu Ltd.
InventorsHikosaburo Hiraki, Takehiro Komatsu
Life of this patent
Estimating the term…
Abstract
A sun gear of a first planetary gear train is connected to an input shaft. A carrier 9 of the first planetary gear train is connected to a sun gear of a second planetary gear train and to a first pump/motor. A ring gear of the first planetary gear train is connected to a second pump/motor, and a ring gear of the second planetary gear train is connected to an output shaft. A first clutch is provided for engaging and disengaging a carrier of the second planetary gear train and the ring gear of the first planetary gear train with and from each other, and a second clutch is provided for engaging and disengaging the carrier of the second planetary gear train and a fixed end with and from each other.
Claims12
A transmission system comprising:
- an input shaft;
- an output shaft;
- a mechanical transmission section;
- and
- a hydraulic transmission section;
- wherein the mechanical transmission section and the hydraulic transmission section are interposed between the input shaft and the output shaft;
- wherein the hydraulic transmission section includes a plurality of pumps/motors which are connectable to each other through a hydraulic circuit, the plurality of pumps/motors including a first pump/motor, a second pump/motor, and a third pump/motor;
- wherein the mechanical transmission section has a first planetary gear train and a second planetary gear train;
- wherein a sun gear of the first planetary gear train is continuously connected to the input shaft, a carrier of the first planetary gear train is continuously connected to a sun gear of the second planetary gear train and is connected to the first pump/motor, a ring gear of the first planetary gear train is connected to the second pump/motor, and a ring gear of the second planetary gear train is connected to the output shaft;
- wherein a first clutch is provided for engaging and disengaging a carrier of the second planetary gear train and the ring gear of the first planetary gear train with and from each other;
- wherein a second clutch is provided for engaging and disengaging the carrier of the second planetary gear train and a fixed end with and from each other;
- and
- wherein a switching mechanism is provided for selectively connecting the third pump/motor to a first pump/motor side or a second pump/motor side.
A transmission system comprising:
- an input shaft;
- an output shaft;
- a mechanical transmission section;
- and
- a hydraulic transmission section;
- wherein the mechanical transmission section and the hydraulic transmission section are interposed between the input shaft and the output shaft;
- wherein the hydraulic transmission section includes a plurality of pumps/motors which are connectable to each other through a hydraulic circuit, the plurality of pumps/motors including a first pump/motor, a second pump/motor, and a third pump/motor;
- wherein the mechanical transmission section has a first planetary gear train and a second planetary gear train;
- wherein a sun gear of the first planetary gear train is continuously connected to the input shaft, a ring gear of the first planetary gear train is continuously connected to a sun gear of the second planetary gear train and is connected to the first pump/motor, a carrier of the first planetary gear train is connected to the second pump/motor, and a ring gear of the second planetary gear train is connected to the output shaft;
- wherein a first clutch is provided for engaging and disengaging a carrier of the second planetary gear train and the carrier of the first planetary gear train with and from each other;
- wherein a second clutch is provided for engaging and disengaging the carrier of the second planetary gear train and a fixed end with and from each other;
- and
- wherein a switching mechanism is provided for selectively connecting the third pump/motor to a first pump/motor side or a second pump/motor side.
Dependencies are inferred from the claim text.