Working Vehicle
AssigneeYanmar Co., Ltd.
InventorsShinya Kawashiri, Norikazu Nakayama
Life of this patent
Estimating the term…
Abstract
A working vehicle in which engine speed can be easily varied by operation of a speed change pedal, and in which an acceleration arm of a governor of an engine and the speed change pedal can be connected in a simple manner to reduce production costs easily. The working vehicle has the engine mounted on a traveling body having traveling wheels, a hydraulic stepless transmission for transmitting power from the engine, and the speed change pedal for increasing and decreasing output speed of the transmission. A speed return mechanism and the acceleration arm are connected via an interlocking mechanism.
Claims14
-3. (canceled)
The working vehicle according to claim 15, wherein a drive control portion is provided with an accelerator operating lever capable of being maintained at a position operated by an operator, and the operator operates said accelerator operating lever so as to operate said accelerator arm.
The working vehicle according to claim 15, wherein said speed returning mechanism has an accelerator coupling arm in which a length is adjustable, and said accelerator coupling arm and said accelerator arm are coupled via a coupling wire of said interlocking mechanism.
The working vehicle according to claim 15, wherein said interlocking mechanism has a coupling wire constituted by an inner wire and an outer wire, said inner wire is locked to said accelerator coupling arm via a stopper, and said accelerator coupling arm at the original position is configured such as to be capable of coming into contact with and coming away from an outer receiver for locking said outer wire.
The working vehicle according to claim 15, wherein said interlocking mechanism has a coupling wire constituted by an inner wire and an outer wire, said inner wire is locked to said accelerator coupling arm via a stopper, and an outer receiver for locking said outer wire is configured such as to be capable of coming into contact with and coming away from said accelerator coupling arm at the original position.
(canceled)
The working vehicle according to claim 15, further comprising a setting mechanism for changing an interlocking range in which said speed returning mechanism and said accelerator arm are coupled via said interlocking mechanism, and an operating means for changing said interlocking range set by said setting mechanism.
(canceled)
The working vehicle according to claim 15, wherein said shift pedal is constituted by a forward moving pedal and a backward moving pedal, a base end side of said forward moving pedal and a base end side of said backward moving pedal are respectively coupled to both end portions of one pedal shaft, and said pedal shaft is rotatably arranged in a step of said traveling machine body.
-14. (canceled)
A working vehicle comprising:
- an engine mounted to a traveling machine body provided with traveling wheels;
- a hydraulic variable speed gear shifting a power from said engine;
- a shift pedal operating so as to increase and decrease a shift output of said hydraulic variable speed gear;
- a speed returning mechanism maintaining an output of said hydraulic variable speed gear approximately zero;
- and
- an accelerator arm operating a speed adjusting mechanism capable of adjusting a rotating speed of said engine,
- wherein said speed returning mechanism has a shift link coupling said hydraulic variable speed gear and said shift pedal, and a speed returning link brought in to contact with said shift link in a direction of returning said shift pedal to an original position by an energizing force of a speed returning spring,
- wherein said speed returning link is configured such as to be movable in the same direction on the basis of each of operations in a forward moving side and a backward moving side of said shift pedal, and is coupled to said accelerator arm of said speed adjusting mechanism via an interlocking mechanism,
- wherein said speed returning link returns said shift link to an original position on the basis of an operation of releasing a foot from said shift pedal so as to maintain an output of said hydraulic variable speed gear approximately zero, and
- wherein said shift link operates said hydraulic variable speed gear to a speed increasing side on the basis of a pedaling operation of said shift pedal, and said accelerator arm operates said speed adjusting mechanism to a high rotation side via said speed returning link and said interlocking mechanism, approximately in proportion to an amount of a pedaling operation of said shift pedal.
Dependencies are inferred from the claim text.