Mechanical stepped speed changer for harvester

Abstract

The invention provides a mechanical stepped speed changer special for a harvester, which has low oil consumption and is convenient to operate. The mechanical stepped speed changer comprises a control unit and a gear speed change unit, wherein the control unit is connected with the gear speed change unit; the gear speed change unit comprises a power input shaft system and a power output shaft system which are arranged in parallel sequentially; an intermediate shaft system is arranged between the power input shaft system and the power output shaft system; the intermediate shaft system comprises an intermediate shaft, and an intermediate gear wheel and an intermediate pinion wheel which are arranged on the intermediate shaft; and shaft sleeves are arranged outside the intermediate gear wheel and the intermediate pinion wheel respectively so as to realize axial positioning.

Description

technical field [0001] The invention relates to a speed change mechanism, in particular to a mechanical stepped speed changer installed on a harvester. Background technique [0002] In the current domestic harvester market, there are two types of walking systems for crawler-type rice and wheat combine harvesters: one is equipped with industrial and agricultural gearboxes, which belong to mechanical step-change; the other is to install a FYW28 on the NL35 gearbox. Hydraulic continuously variable transmission. [0003] At the beginning of the 21st century, domestic harvesters used a step-change walking system with industrial and agricultural gearboxes as the main body. This kind of gearbox is heavy and bulky. Four handles are used to change gears frequently to adjust the forward and backward of the harvester. Changing gears quickly and slowly and turning left and right are time-consuming and complicated operations. Therefore, more users prefer the harvester with hydraul...

AI Technical Summary

Problems solved by technology

[0003] At the beginning of the 21st century, domestic harvesters adopted a step-variable walking system with industrial and agricultural gearboxes as the main body. This kind of gearbox is heavy and bulky. Four handles are used to change gears frequently to adjust the forward and backward of the harvester. Changing gears quickly and slowly and turning left and right, the operation is time-consuming and complicated

[0004] However, there is an Achilles heel in the above-mentioned hydraulic continuously variable transmission system, that is, its total efficiency η is on the low side, and the value of η is usually about 52%. The power must be 20kw, of which 9.5kw input power does useless work, wastes energy, increases emissions, and at the same time because of its large fuel consumption, the use cost is high

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