Hydraulic shifting mechanism of gearbox

Abstract

The invention provides a hydraulic shifting mechanism of a gearbox. The hydraulic shifting mechanism comprises a shifting gear, a synchronizer, a shifting fork and a hydraulic oil cylinder that are mounted in a gearbox housing, wherein a shifting gear bearing is connected with an input shaft; the synchronizer is in spline fit with the input shaft; the shifting fork is connected with the synchronizer; a piston rod of the hydraulic oil cylinder is fixedly arranged in the gearbox housing; a cylinder barrel of the hydraulic oil cylinder is connected with the shifting fork; and the cylinder barrel can drive the synchronizer to slide on the input shaft through the shifting fork, so as to allow the synchronizer to be combined with or separated from the shifting gear. According to the hydraulic shifting mechanism of the gearbox, and the hydraulic oil cylinder driving the shifting fork to move is arranged in the gearbox housing, and the hydraulic oil cylinder and the gearbox are integrated, so that the assembling difficulty is reduced, the mounting is convenient, a space is saved, and no damage is caused easily. The cylinder barrel slides integrally to drive the shifting fork to move, and no deviation is produced in a moving process, so that the precision is high, the stability is good, the sliding stress of the synchronizer is balanced, the abrasion is little, the service life can be prolonged, and the shifting reliability can be improved.

Description

technical field [0001] The invention belongs to the technical field of gearboxes, and in particular relates to a hydraulic shifting mechanism of a gearbox. Background technique [0002] In the existing hydraulic shifting mechanism, the oil cylinder barrel that performs the shifting action is generally arranged outside the gearbox housing, and the shift fork is driven by the piston rod of the oil cylinder, and then the synchronizer is combined with the shifting gear to perform gear shifting and power. Switching, the expansion and contraction of the piston rod of the oil cylinder is controlled by the oil pipe connected to the cylinder to pump in and out the hydraulic oil, which has a complex structure and high assembly requirements, and the piston rod is prone to deviations in expansion and contraction, resulting in uneven stress during the sliding process of the synchronizer and increased wear , The shortcoming of shortened lifespan. Contents of the invention [0003] The ...

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Problems solved by technology

[0002] In the existing hydraulic shifting mechanism, the oil cylinder barrel that performs the shifting action is generally arranged outside the gearbox housing, and the shift fork is driven by the piston rod of the oil cylinder, and then the synchronizer is combined with the shifting gear to perform gear shifting and power. Switching, the expansion and contraction of the piston rod of the oil cylinder is controlled by the oil pipe connected to the cylinder to pump in and out the hydraulic oil, which has a complex structure and high assembly requirements, and the piston rod is prone to deviations in expansion and contraction, resulting in uneven stress during the sliding process of the synchronizer and increased wear , the disadvantage of shortened life

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