Proportional steering transmission for crawler harvester

Abstract

The invention discloses a proportional steering type speed changer for a crawler-type harvester. Power is transmitted to a speed change assembly through a clutch; the speed change assembly outputs the power to left and right side crawler wheel power output shafts through a planetary gear transmission mechanism; a gear ring of the planetary gear transmission mechanism is controlled by a hydrostatic stepless speed change device; when the hydrostatic stepless speed change device outputs no power, the planetary gear transmission mechanism is driven by the speed change assembly alone, and the harvester runs straightly; when the hydrostatic stepless speed change device outputs the power, the planetary gear transmission mechanism is driven by two sets of power in a compound mode, so that the rotating speeds of crawler belts on the two sides are different, differential speed type steering is achieved, and the proportional relation is formed between the steering angular speed and the rotating speed of the hydrostatic stepless speed change device; the hydrostatic stepless speed change device is installed on a second shaft, the input steering direction of the hydrostatic stepless speed change device is the same as the heading direction and the reversing direction of the crawler-type harvester, accordingly, the crawler-type harvester has the same steering characteristic during heading and reversing, reducing of stacked sludge during steering is facilitated, and the rice field flatness and the steering controllability are improved.

Description

technical field [0001] The invention relates to the technical field of crawler equipment power transmission, in particular to a proportional steering transmission for a crawler harvester. Background technique [0002] Due to the large water demand of rice during the whole growth process, long-term water storage in paddy fields leads to soft soil and poor bearing capacity. Wheeled operating machinery is easy to sink and slip after leaving the field, which is not suitable for paddy field operations; due to the large contact area of ​​crawler type operating machinery, The grounding pressure of the unit is small, the subsidence is small during field operation, the damage to the paddy field is small, and the paddy field has strong adaptability. However, the existing crawler harvesters usually use the tooth embedded clutch to steer. When turning, the power on the steering side is separated or braked, so that the speed of the inner track is lower than the speed of the outer track t...

AI Technical Summary

Problems solved by technology

[0002] Due to the large water demand of rice during the whole growth process, long-term water storage in paddy fields leads to soft soil and poor bearing capacity. Wheeled operating machinery is easy to sink and slip after leaving the field, which is not suitable for paddy field operations; due to the large contact area of ​​crawler type operating machinery, The grounding pressure of the unit is small, the subsidence is small during field operation, the damage to the paddy field is small, and the paddy field has strong adaptability

However, the existing crawler harvesters usually use the tooth embedded clutch to steer. When turning, the power on the steering side is separated or braked, so that the speed of the inner track is lower than the speed of the outer track to realize the steering. , the steering is more accurate, and the damage to the farmland is small; when the steering is at a large angle (such as a U-turn at the head of the field), the track harvester rotates around the center of the inner track because the inner track stops moving, resulting in the accumulation of mud around the turn and damage to the farmland. It is not conducive to water storage in farmland, especially the current prevalence of late rice and secondary rice, improving the flatness of farmland after harvest, which is conducive to the production of secondary rice and increasing yield

At the same time, this steering method, because one side of the track loses power when turning, causes low steering efficiency; and the ratio of the input speed of the existing hydrostatic continuously variable transmission to the engine speed is constant, resulting in different gears at the same steering angle. Corresponding to different steering angular speeds, which in turn affects steering accuracy

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