A construction machinery gearbox

Abstract

The invention discloses an engineering machinery gearbox and belongs to the technical field of gearboxes. According to the engineering machinery gearbox, a fixed gear (1) is installed on an input shaft I, a fixed gear (11) is installed on an output shaft VI, three fixed gears are installed on a middle shaft V, hub gears are installed on a middle shaft II, a middle shaft III and a middle shaft IV respectively, two clutches and two movable gears are installed on the middle shaft II, two clutches and three movable gears are installed on the middle shaft III, and a clutch and a movable gear are installed on the middle shaft IV. According to the engineering machinery gearbox, the six power transmission shafts and the fourteen gears constitute three forward gears and two backward gears, each forward gear is achieved by closing the two corresponding clutches and meshing the corresponding gears four times, each backward gear is achieved by closing the two corresponding clutches and meshing the corresponding gears five or three times, the structure is simple, maintenance is facilitated, and the transmission efficiency of the gearbox is improved remarkably.

Description

Technical field [0001] The invention relates to an engineering machinery gearbox and belongs to the technical field of gearboxes. Background technique [0002] Gearbox is one of the most important parts of construction machinery. According to its gear system, it is divided into planetary gearbox and fixed shaft gearbox. The former planetary gearbox has complex structure, high precision requirements, few gears, low transmission efficiency, and high failure rate. The latter fixed-shaft gearbox is a multi-speed reverse gearbox that can be shifted under load, as disclosed in the Chinese Patent Application Publication CN1068939C. The gearbox requires two clutches, ten gears and six The power output can be achieved by the second meshing, and the forward first gear is the most efficient. The more meshing times of the gears in the transmission process will directly lead to a decrease in transmission efficiency and an increase in parts maintenance costs. Moreover, the gear setting of the...

AI Technical Summary

Problems solved by technology

The former planetary gearbox has complex structure, high precision requirements, few gears, low transmission efficiency, and high failure rate

The latter fixed-shaft gearbox is disclosed as a kind of multi-block reversing gearbox that can be shifted under load as disclosed in the Chinese invention patent application publication specification CN1068939C. This gearbox needs two clutches, ten gears and six gears to move forward for one gear. The power output can only be achieved by meshing once, and the first forward gear has the highest efficiency. The more meshing times of the gears in the transmission process, the lower the transmission efficiency and the higher the maintenance cost of the parts will be directly caused. Moreover, the gear setting of the gearbox is complicated, especially the reverse gear. Many, for construction machinery that is generally working in a forward state, it does not need so many reverse gears

attached image 3 It is a topological scheme of the end surface of a fixed-axis gearbox. Seen from the end surface, each axis forms a triangle, two quadrilaterals and a straight line. If the transmission line is too long, its transmission efficiency will inevitably be greatly affected.

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