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US 8,997,914 B2Granted
Work vehicle
AssigneeKubota Corporation
InventorsHideya Umemoto, Akira Minoura
Life of this patent
Estimating the term…
Abstract
A pump supplying reservoir oil reservoired in an input case to devices to be supplied with the reservoir oil and a filter for filtering the reservoir oil circulating in the input case are provided in the input case. A pump supplying reservoir oil in each of left and right axle cases to a hydraulic continuously variable transmission provided in each of the axle cases and a filter filtering the reservoir oil circulating in each of the left and right axle cases are provided in each of the left and right axle cases.
Claims20
A work vehicle wherein
- on left and right sides of an input case, axle cases are respectively positioned to drive at least one of left or right traveling wheels, the input case forming a first enclosed space into which an input shaft for engine power transmission is introduced, the axle cases forming second enclosed spaces which are separate from each other and from the first enclosed space in which hydraulic continuously variable transmissions are respectively internally installed and supporting axles of the left or right traveling wheels, and the left or right traveling wheels being driven via the hydraulic continuously variable transmissions,
- a branch transmission shaft branch-transmitting a driving force of the input shaft to the hydraulic continuously variable transmissions in the axle cases is provided in the input case,
- an input case oil pump supplying reservoir oil reservoired in the input case to devices located within the input case to be supplied with the reservoir oil and an input case filter for filtering the reservoir oil circulating in the input case are provided in the input case, and
- first and second axle oil pumps supplying reservoir oil in each of the left and right axle cases to the hydraulic continuously variable transmission provided in each of the left and right axle cases and first and second axle case filters filtering the reservoir oil circulating in each of the axle cases are provided in each of the axle cases.
1 more element
A work vehicle wherein
- on left and right sides of an input case, axle cases are respectively positioned to drive at least one of left or right traveling wheels, the input case forming a first enclosed space into which an input shaft for engine power transmission is introduced, the axle cases forming second enclosed spaces which are separate from the first enclosed space in which hydraulic continuously variable transmissions are respectively internally installed and supporting axles of the left or right traveling wheels, and the left or right traveling wheels being driven via the hydraulic continuously variable transmissions,
- a branch transmission shaft transmitting a driving force of the input shaft to the hydraulic continuously variable transmissions in the axle cases is provided in the input case,
- the input case and the axle cases on the left and right sides have fitting portions formed on mutually opposing sides in a lateral direction and at places on outer periphery sides of the branch transmission shaft, the fitting portions being engageable and disengageable,
- the branch transmission shaft engaging with said supporting axles in areas of the fitting portions, and
- in an engaged state of the fitting portions, the input case and the axle cases are linked.
2 more elements
A work vehicle comprising:
- an input case defining a first enclosed space and comprising an input shaft, a branch transmission shaft, a first pump pumping oil within the first enclosed space and a first filter filtering the oil located within the first enclosed space;
- a right axle case defining a second enclosed space and comprising a right hydraulic continuously variable transmission, a second pump pumping oil within the second enclosed space, a second filter filtering the oil located within the second enclosed space, and a right axle shaft providing drive power to a right wheel;
- a left axle case defining a third enclosed space and comprising a left hydraulic continuously variable transmission, a third pump pumping oil within the third enclosed space, a third filter filtering the oil located within the second enclosed space, and a left axle shaft providing drive power to a left wheel;
- and
- the branch transmission shaft transmitting a driving force of the input shaft to the right and left hydraulic continuously variable transmissions via the right and left axle shafts.
2 more elements
Dependencies are inferred from the claim text.