Three-section type hydro-mechanical stepless transmission device for loader

Abstract

The invention discloses a three-section type hydro-mechanical stepless transmission device for a loader. The three-section type hydro-mechanical stepless transmission device for the loader comprises three hydro-mechanical sections, and adopts a hydro-mechanical section for starting, so that low-speed transmission efficiency can be improved. The transmission device concretely comprises an input part, a hydraulic speed regulation loop, a distributary and conflux mechanism, a hydro-mechanical I section fixed shaft gear transmission mechanism, a hydro-mechanical II section fixed shaft gear transmission mechanism, a hydro-mechanical III section fixed shaft gear transmission mechanism, a reverse gear mechanism and an output part. The transmission device adopts a planetary mechanism for carrying out confluence of hydraulic power and mechanical power, and is formed by three sections of three sections of hydro-mechanical sections in a moment distribution and speed confluence way through continuous joining. The section I is used for starting, the section II is applied in a low-speed operation working condition, and the section III is used for walking at high speed. An astern condition is divided into two sections which are a reverse gear hydro-mechanical section I and a reverse gear hydro-mechanical section II. By adopting the compound of the hydraulic power and the mechanical power, high transmission efficiency and low oil consumption during an operation and transfer process can be ensured.

Description

technical field [0001] The invention relates to a stepless transmission device, in particular to a three-stage hydraulic-mechanical composite stepless transmission device, which belongs to the technical field of power transmission. Background technique [0002] At present, construction machinery loaders generally use hydraulic mechanical power shift gearboxes. Due to the needs of loading operations, the vehicle speed and engine load change drastically, and the efficiency of the hydraulic torque converter is low, resulting in a maximum transmission efficiency of about 75%. [0003] The hydrostatic transmission can conveniently realize stepless speed regulation, so that the engine of the loader can always work in the economic speed range, which can improve the energy utilization efficiency of the vehicle; however, the efficiency of the hydraulic pump motor closed speed regulation circuit used in the hydrostatic transmission is relatively low Therefore, compared with the power ...

AI Technical Summary

Problems solved by technology

The power of the hydraulic components required for the transmission scheme of 2 hydraulic mechanical sections is relatively large; for the transmission scheme of 3 hydraulic mechanical sections, the speed of the hydraulic components is still discontinuous when switching between the second and third sections

However, both schemes use the hydraulic section to start, and the efficiency is lower than that of the hydraulic mechanical section.

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