Power shift transmissions for construction machinery

Abstract

The invention discloses a power shift gear box applied to engineering machinery. The power shift gear box comprises an input shaft and an output shaft, and power transmission is conducted between the input shaft and the output shaft through three power transmission units. According to the power shift gear box, five transmission shafts are adopted, the total number of gears on each shaft is fourteen, the structure is simple, the pair number of the transmission gears is small, the number of parts participating into transmission is small, all forward gears output power through meshing of four pairs of gears, all backward gears output power through meshing of three pairs of gears, and therefore transmission efficiency is high. The number of the shafts is reduced, the structure of a box body is simple and manufacturing cost is reduced due to adoption of a double-acting clutch. Meanwhile, the gear box can adopt six forward gears and three backward gears, power utilization rate of an engine and acceleration performance of an automobile are improved, and the power shift gear box is suitable for being matched with a three-element torque converter which is high in transmission efficiency.

Description

technical field [0001] The invention relates to a shift gearbox, in particular to a power shift gearbox suitable for engineering machinery, and belongs to the technical field of engineering machinery. Background technique [0002] At present, the gearboxes used in construction machinery, such as loaders, graders, road rollers, and dump trucks, generally have two types: planetary type and fixed shaft type. The use of a planetary gearbox has a complex structure, high precision requirements, poor processing technology, and high manufacturing costs. Existing fixed-shaft gearboxes, for example, the Chinese invention patent with the patent application number "95196765.7" discloses "a multi-speed reversing transmission that can shift gears under load". Gear side effects output power, the first forward gear outputs power through six pairs of gears meshing, the remaining forward gears output power through four pairs of gears meshing, and the reverse gear outputs power through five p...

AI Technical Summary

Problems solved by technology

[0003] The above two kinds of transmission gears have many meshing pairs and many parts involved in the transmission. At the same time, both transmissions have eight shafts and six clutches, which will inevitably lead to a decrease in transmission efficiency, an increase in temperature rise, and increased wear and tear of parts, and manufacturing and maintenance costs. Increase

The two transmissions use a single-acting clutch, which increases the number of shafts and the number of mounting holes for the shafts on the box body, which increases the complexity and processing difficulty of the box, and increases the cost

[0004] The Chinese utility model patent with the patent application number "201120439772.7" discloses the "construction machinery hydraulic mechanical gearbox", in which the forward third gear and forward fifth gear transmission chains are too long, and the power is output through 8 pairs and 6 pairs of gears meshing respectively. Construction machinery, especially the reverse gear with high utilization rate of loaders also has 5 pairs of gears meshing to output power. Like the above two transmissions, the transmission chain is long, which will inevitably lead to a decrease in transmission efficiency, an increase in temperature rise, and increased wear of parts. Manufacturing and Increased maintenance costs

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