Mechanical step speed changer for harvester

Abstract

The invention provides a mechanical step speed changer special for a harvester, which is low in oil consumption and simple and convenient for operation. The mechanical step speed changer comprises a manipulating unit and a gear speed change unit. The manipulating unit and the gear speed change unit are connected. The gear speed change unit comprises a power input shaft system, a middle shaft system and a power output shaft system arranged in parallel in sequence. The power input shaft system comprises a power input shaft and a speed-change combined gear assembled on the power input shaft. A power separator for cutting the power input during gear shaft operation is assembled at the input end of the power input shaft. The manipulating unit can drive the speed-change combined gear to axially slide along the power input shaft to realize engagement of corresponding gears among shaft systems. The middle shaft system comprises a middle shaft and a middle rack wheel and a middle pinion which are assembled on the middle shaft. The power output shaft system comprises a power output shaft and a high speed output gear, a back output gear and a low speed output gear which are assembled on the power output shaft. The back output gear on the power output shaft is always engaged with the middle pinion on the middle shaft.

Description

Technical field [0001] The invention relates to a speed change mechanism, in particular to a mechanical stepped transmission installed on a harvester. Background technique [0002] In the current domestic harvester market, there are two types of walking systems for crawler rice-wheat combine harvesters: one is equipped with industrial and agricultural gearboxes, which belong to mechanical stepped transmission; 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 adopted a step-variable walking system with industrial and agricultural gearboxes as the main body. This kind of gearbox is heavy and bulky. It needs four handles and frequently changes gears to adjust the forward and backward movement of the harvester. Fast and slow gear changes and left and right steering, the operation is time-consuming and complicated. Therefore, more users favor the hydraulic continuously ...

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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