First-stage variable pump control system with simplified structure

Abstract

The invention discloses a first-stage variable pump control system with a simplified structure. The system comprises an oil pump, a pump outlet, a main oil passage and an oil sump, the oil pump comprises a pump body, a feedback pressure control cavity, a variable sliding block, a variable spring, an oil inlet and an oil outlet, the oil sump is connected to the oil inlet through an oil path, and the oil outlet communicates with the oil sump through the pump outlet and the main oil passage; an oil through groove or an oil through hole is formed in the position, close to the oil outlet, of the variable sliding block and used for introducing pressure oil of the oil outlet into the feedback pressure control cavity; when the oil pressure of the oil outlet is increased, the oil pressure in the feedback pressure control cavity is correspondingly increased; and when the oil pressure reaches a set variable pressure point, the oil pressure in the feedback pressure control cavity can push the variable sliding block to overcome the elastic force of the variable spring to deflect, so that the output displacement of the oil pump is reduced, the first-stage displacement is variable, the variable response is more sensitive, an oil circuit can be actively protected if the oil circuit pressure is too high, and therefore a safety valve mechanism does not need to be designed.

Description

technical field [0001] The invention belongs to the technical field of oil pumps, and in particular relates to a control system based on a first-stage variable displacement oil pump. Background technique [0002] Existing conventional variable displacement pumps can be divided into primary variable displacement pumps, secondary variable displacement pumps, and fully variable displacement pumps. The primary variable displacement pump has a simple structure, simple calibration, high reliability, low cost, and general energy saving; the secondary variable displacement pump has a complex structure, more complicated calibration, reliable performance, high cost, and good energy saving; the fully variable displacement pump has a simple structure, The calibration is complicated, the performance is reliable, the cost is high, and the energy saving is good. [0003] The existing one-stage variable pump includes a pump body, a feedback pressure control chamber, a variable slider, a va...

AI Technical Summary

Problems solved by technology

[0003] The existing one-stage variable pump includes a pump body, a feedback pressure control chamber, a variable slider, a variable spring, an oil inlet, and an oil outlet. The pressure oil in the main oil passage or the pump outlet pushes the variable sliding block to deflect to realize the variable; in addition, in order to protect the oil passage, it is usually necessary to design a safety valve structure (steel ball + spring + plug) and an oil drain passage on the pump body, which not only makes the The structure of the pump body is complicated, and the control strategy of the whole system is also relatively complicated

Images