RUNNING SPEED CHANGE GEAR STRUCTURE FOR FARM WORKING VEHICLE

摘要

PURPOSE:To aim at the facilitation of speed changing operation, by installing a mechanism which links a gear shifter with a spring to set energizing force of the spring restoring the hydraulic type continuously variable speed change gear to neutral to be strong at the high speed position side of the speed change gear but weak at the low speed position side. CONSTITUTION:A pedal 7 capable of reciprocally shifting a hydraulic type continuously variable speed change gear 3 is installed in the driving part of a car body. At this time, this pedal 7 is connected to the rocking cam plate 23 attached to a trunnion shaft 28 of the gear shifter 3 via a rod 22. And, a triangularly recessed cam face is formed in this rocking cam plate 23, and a rocking arm 24 having a pin 24A engaged with this cam face is attached to a side face of the speed change gear 3. Then, a spring 25 energizing the pin 24A is attached to the rocking arm 24, and the rocking cam plate 23 is maintained to an attitude corresponding to neutrality of the trunnion shaft 28. In addition, both ends of the spring 25 are attached to both linkage 27 as a link mechanism linking up with the rocking arm 24 and an auxiliary gearshifting lever 26.