초록 ▼

In an operation mechanism of an HST system transmission apparatus of the type in which an HST system non-stage transmission mechanism for driving and an HST system non-stage transmission mechanism for turning are disposed, the HST system non-stage transmission mechanism is operated by a transmission

In an operation mechanism of an HST system transmission apparatus of the type in which an HST system non-stage transmission mechanism for driving and an HST system non-stage transmission mechanism for turning are disposed, the HST system non-stage transmission mechanism is operated by a transmission lever and the HST system non-stage transmission mechanism for turning is operated by a round operation wheel, a steering mechanism can make a turning operation matching turn feeling desired by an operator in turning at both low and high speeds. Namely, in the operation of the HST system transmission apparatus wherein the HST system non-stage transmission mechanism (25) for driving is operated by a transmission lever (68) and the HST system non-stage transmission mechanism (28) for turning is operated by a round operation wheel (19), a speed ratio between right and let driving devices is changed in accordance with the operation turning angle of the round operation wheel (19). The turning radius is changed, even with the same operation turning angle of the round operation wheel (19), by the difference of the operation angle of the transmission lever (68).

대표청구항 ▼

[ What is claimed is:] [1.]1. A steering mechanism of a driving transmission apparatus, said driving transmission apparatus transmitting an output power of an engine to left and right crawler-type driving devices through a speed changing mechanism and a differential mechanism, comprising:a steering

[ What is claimed is:] [1.]1. A steering mechanism of a driving transmission apparatus, said driving transmission apparatus transmitting an output power of an engine to left and right crawler-type driving devices through a speed changing mechanism and a differential mechanism, comprising:a steering HST provided on said driving transmission apparatus, wherein the rotational difference between said left and right crawler-type driving devices is increased through said differential mechanism in proportion to the output of said steering HST, anda steering operation means provided on an operation portion of a vehicle, wherein, as the operation degree of said steering operation means is increased, the output rotary speed of said steering HST is increased and the output rotary speed of said speed changing mechanism is reduced and wherein, when said speed changing mechanism is set in a substantially median speed range, as the operation degree of said steering operation means is increased, a turning side one of said left and right crawler-type driving devices is decelerated and the opposite side one is kept at a substantially constant speed.