Continuously-variable transmission for mechanical direct-drive hydraulic double-control tracked vehicle

Abstract

The invention discloses a continuously-variable transmission for a mechanical direct-drive hydraulic double-control tracked vehicle. According to the continuously variable transmission, a power input portion inputs power to an advance and retreat gear deceleration portion, the advance and retreat gear deceleration portion transmits power to a differential planetary transmission stepless speed change portion through an intermediate power transmission portion, then, the differential planetary transmission stepless speed change portion outputs the power to a drive transition deceleration transmission portion, and finally the power is transmitted to a left side caterpillar band drive portion and a right side caterpillar band drive portion, wherein an advance and retreat gear control portion is used for gear switching of the advance and retreat gear deceleration portion. Double self-locking type hydraulic motors are arranged in the differential planetary transmission stepless speed change portion, so that mechanical direct drive, hydraulic stepless speed regulation and steering control are achieved. When the double self-locking type hydraulic motors are in the same working state, the tracked vehicle achieves mechanical direct drive and hydraulic stepless speed regulation drive; when the double self-locking type hydraulic motors are not in the same working state, rotating speed difference happens between left side caterpillar band output wheels and right side caterpillar band output wheels, hydraulic control steering is achieved, transmission and steering of the tracked vehicle are integrated, operation is easy and convenient to perform, and the tracked vehicle is easy to drive.

Description

technical field [0001] The invention relates to the technical field of variable speed of agricultural machinery, in particular to a continuously variable transmission for mechanical direct-drive hydraulic dual-control crawler vehicles. Background technique [0002] The tracked vehicle transmission system usually includes two main structures of clutch and transmission, and the wheeled vehicle transmission system mainly includes five main structures of clutch, transmission, universal drive, final drive and differential. Due to the large difference in structure between tracked vehicles and wheeled vehicles, the working principle is also very different, and the transmission system of tracked vehicles usually has the function of the steering system of wheeled vehicles; Tractors usually use a purely mechanical power transmission system to transmit power, which has the advantages of simple structure and high efficiency. It is difficult to control the coordination of clutch, accele...

AI Technical Summary

Problems solved by technology

[0003] At the same time, the crawler tractor vehicles on the market usually adopt the steering scheme of the steering rod to operate the jaw clutch and the multi-disc brake. The realization process is: when the crawler tractor vehicle turns left, the driver operates the left steering rod to make The left jaw clutch is separated and the left output shaft is braked. Since the transmission power on the left side of the crawler tractor is interrupted and braked to stop the rotation, at this time, driven by the power on the right side of the tractor, the implement turns to the left; the same reason Right steering can be realized, however, this kind of steering mechanism is realized by separating and combining jaw clutches and brakes, which has low steering precision and poor steering controllability

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