| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a travel transmission device of an operation vehicle which does not bring about gear change shock upon a gear change operation by means of a gear change instruction tool and permits quick gear change having no discomfort in response to gear change operation upon the gear change operation by means of a gear change instruction tool.SOLUTION: A travel transmission device of an operation vehicle includes a gear change transmission system of a multistage transmission type and a gear change control part which performs gear change control of the gear change transmission system in accordance with an operation of a successive travel operation tool. Therein, the gear change transmission system includes a high and low speed transmission mechanism 11 of a switching clutch type, a main transmission mechanism 12 of a synchro switching type and an advance and retreat switching mechanism 13 of a switching clutch type and, when a gear change instruction tool is operated into a prescribed middle gear change position by the gear change control part, the gear change control part determines operation middle and operation completion, successively performs switching to a gear change step of the middle gear change position and performs switching to a gear change step of the gear change position which is determined as the operation completion succeeding to the completion of the switching.</p> |
