| 摘要 |
When an operation lever is operated to either a speed changing path or a neutral path, a second link mechanism establishes no operative coupling between the operation lever and a parking brake mechanism. When the operation lever is operated from the neutral path to a linking path, the second link mechanism establishes operative coupling between the operation lever and the parking brake mechanism. Further, when the operation lever is operated to a braking path, the parking brake mechanism is activated. When the lever is operated to a locking path, a locking mechanism is activated. |
| 主权项 |
1. A work vehicle comprising:
an engine; a transmission mechanism for transmitting a rotational drive power of the engine to a traveling device; a speed changer device provided in the transmission mechanism and capable of changing vehicle speed by speed-changing the rotational drive power; a parking brake mechanism capable of restricting operation of the transmission mechanism; a single operation lever that is manually pivotable and capable of speed changing operations of the speed changer device and a braking operation of the parking brake device; a first link mechanism for linking the operation lever with the speed changer device; a second link mechanism capable of linking and release of linking between the operation lever and the parking brake mechanism; a locking mechanism capable of maintaining the parking brake device under a condition of restricting operation of the operation lever through restriction of position of the operation lever; wherein the operation lever includes, as speed changing operation paths thereof, a neutral path corresponding to a neutral state of the speed changer device and a speed changing path extending straight from the neutral path and corresponding to a speed changing state of the speed changer device; the braking operation is effected only by a pivotal operation of the operation lever; the operation lever includes, as brake operating paths thereof, a linking path extending from the neutral path along a direction intersecting the speed changing path, a braking path extending from a terminal end of the linking path along a direction intersecting the linking path, and a locking path extending at least from a terminal end of the braking path along a direction intersecting the braking path; when the operation lever is operated either to the speed changing path or the neutral path, the second link mechanism does not link the operation lever with the parking brake mechanism; when the operation lever is operated from the neutral path to the linking path, the second link mechanism links the operation lever with the parking brake mechanism; when the operation lever is operated to the braking path, the parking brake mechanism is actuated; and when the operation lever is operated to the locking path, the locking mechanism is actuated. |
