A full hydraulic drive road sweeper walking differential switching device

Abstract

The invention discloses a full hydraulic drive street sweeper walking differential speed switching device which comprises a closed pump and a dividing valve. The closed pump comprises a plunger pump connected with an oil supplementing pump and a flush valve. The dividing valve comprises a first dividing and collecting valve, a second dividing and collecting valve, a first two-station three-way hydraulic operated directional valve, a second two-station three-way hydraulic operated directional valve and a two-station three-way electromagnetic directional valve. The two-station three-way electromagnetic directional valve is adopted to control the two two-station three-way hydraulic operated directional valves to change directions, the two two-station three-way hydraulic operated directional valves are adopted for controlling oil supplied to the closed pump to pass through the two dividing and collecting valves or not. Under the condition that the road condition is poor, the differential speed function is started, forced dividing is carried out through the two dividing and collecting valves, it is ensured that two front wheel motors do not slide, and a street sweeper has the good driving force and stable driving speed all the time; under the condition that the road condition is flat, the differential speed function is closed, the oil temperature of a hydraulic system is prevented from being too high, pressure loss is reduced, and walking drive efficiency is improved.

Description

technical field [0001] The invention relates to a road sweeper hydraulic system, in particular to a fully hydraulically driven road sweeper travel differential switching device, which belongs to the technical field of road sweeper travel control hydraulic systems. Background technique [0002] At present, the cleaning of streets, parks, squares, and sidewalks in most domestic cities is generally dominated by manual cleaning; with the development of cities and the increase in labor costs, this traditional manual cleaning method is increasingly being replaced by cleaning mechanization. Tall sweepers instead. The existing small full-hydraulic drive road sweepers are not only compact in structure, simple in operation, and high in cleaning efficiency, but also generally use closed hydrostatic walking hydraulic systems, which are driven by hydraulic motors installed on tires; and four-wheel drive Due to its large driving force, the road sweeper is more and more widely used. [0...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a walking differential switching device for a fully hydraulically driven road sweeper with compact structure, convenient disassembly and assembly, easy manufacture, safety and reliability, and strong practicability. Under normal circumstances, the differential function can be enabled to prevent the tire from slipping due to the difference in adhesion to the ground; while the differential function can be turned off when the road surface is relatively flat, so as to prevent the oil temperature of the hydraulic system from overheating, reduce the pressure loss, and improve the driving force. Efficiency; and has the advantages of small valve block

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