Tractor synchronizer gear shifting oil cylinder, gear shifting method and tractor

Abstract

The invention relates to a tractor synchronizer gear shifting oil cylinder, a gear shifting method and a tractor. The gear shifting oil cylinder comprises a piston rod, a cylinder body and a positioning piston, the positioning piston can be arranged in the cylinder body in an axial moving mode, and the piston rod is arranged on the cylinder body in a sealed and penetrating mode and can axially move relative to the cylinder body; the positioning piston is of a cylindrical structure, the piston rod is sleeved with the positioning piston, a piston is arranged in the middle of the piston rod, the peripheral side wall of the piston is in sealed connection with the inner side wall of the positioning piston and can axially move relative to the positioning piston, and a cavity of the cylinder body is divided into a first cavity and a second cavity by the piston; and a first oil port and a second oil port are formed in the cylinder body, the first oil port communicates with the first cavity, and the second oil port communicates with the second cavity. The tractor synchronizer gear shifting oil cylinder is high in response speed, high in reliability, compact in structure and low in cost. The piston rod of the gear shifting oil cylinder is arranged in the positioning piston in a sleeved mode, the piston arranged on the piston rod is matched with an inner cavity of the positioning piston, and gear shifting control can be achieved by utilizing the two cavities of the cylinder body to be matched with the two oil ports.

Description

technical field [0001] The invention relates to the relevant technical field of tractors, in particular to a tractor synchronizer shift oil cylinder, a shift method and a tractor. Background technique [0002] At present, the shifting methods commonly used in domestic tractor transmission boxes include gear shifting with meshing sleeves, gear shifting with synchronizers, and power shifting. Among them, the gear shifting of the meshing sleeve has the advantages of simple structure and low manufacturing cost, but the impact of gear shifting is relatively large, resulting in a short service life of the transmission box. In order to make up for the deficiencies in the shifting technology of the meshing sleeve, a synchronizer shifting technology has been developed, but this shifting technology requires manual manipulation to achieve shifting, and the maneuverability is not good, and automatic shifting control cannot be realized. [0003] The application number is CN202010343617....

AI Technical Summary

Problems solved by technology

This patent has the following disadvantages: (1) an independent center control oil port is set, and the control method is complicated

(2) The guide length of the second piston is too short, which is prone to sticking and has a high failure rate

(3) The friction resistance of the seal of the first piston is relatively large, which reduces the response speed of the oil cylinder

(4) There is no buffer device when the piston runs to the limit position, and the impact force between the piston and the cylinder is relatively large

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