Isolating valve of oil pump

Abstract

The invention relates to an isolating valve of an oil pump. The isolating valve of the oil pump is characterized by comprising a lower valve seat (1), a valve sleeve (2), an upper valve seat (3), two valve elements (4) and springs (5), wherein the lower valve seat (1) and the upper valve seat (3) are correspondingly arranged at two ends of the valve sleeve (2); a mechanical pump branch (P1) and an electric pump branch (P2) are correspondingly connected to two ends of the valve sleeve (2); the two valve elements (4) are arranged in the valve sleeve (2) and can move along the inner wall of the valve sleeve (2); the springs (5) are arranged between the two valve elements (4); a mechanical pump branch oil outlet (A1) and an electric pump branch oil outlet (A2) are processed in the wall surface of the valve sleeve (2); the valve elements (4) are of circular barrel shaped structures and arranged in a port-to-port manner; the springs (5) are arranged in circular barrels of the two valve elements (4). The isolating valve of the oil pump is simple in structure, high in flow rate, fast to respond, high in reliability, and low in cost; two switches are provided; the valve elements can act without external control; the isolating valve is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of hydraulic valves for stepless gearboxes of hybrid electric vehicles, and in particular relates to an oil pump isolation valve for a double-pump system. Background technique [0002] The continuously variable transmission of hybrid electric vehicles has two modes, namely pure electric mode and hybrid mode. At low speed, the pure electric mode is started. At this time, the mechanical pump rotates at a low speed and cannot provide enough hydraulic oil to the hydraulic system of the continuously variable transmission, and the oil pressure cannot be established. Therefore, it is necessary to add an electric pump. When the mechanical pump cannot provide enough hydraulic oil At this time, the electric pump works to ensure the normal operation of the hydraulic system of the hybrid continuously variable transmission; at medium and high speeds, the speed of the mechanical pump increases to provide enough hydraulic ...

AI Technical Summary

Problems solved by technology

[0005] The present invention designs an oil pump isolation valve, which solves the problem of power interruption that may occur when the electric mode and the hybrid mode of the hybrid continuously variable transmission are switched to each other, and the action of the isolation valve spool in the prior art needs to be controlled separately by external force. Small flow, high cost, slow response, and complex control, unsuitable for large-scale applications

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