Common-rail high-pressure oil inlet/outlet valve assembly and common-rail high-pressure oil supply pump

Abstract

The invention relates to a common-rail high-pressure oil inlet / outlet valve assembly which comprises a plunger bushing; a plunger cavity, a connecting cavity and an oil inlet are formed in the plungerbushing; a plunger is inserted in the plunger cavity in a sliding manner; an oil outlet connector is mounted on the connecting cavity and is provided with a seventh oil passage; an oil inlet valve seat is mounted in the connecting cavity and is hermetically connected with the plunger cavity; a first oil passage and a second oil passage for communicating the oil inlet with the plunger cavity are formed in the oil inlet valve seat; the first oil passage is communicated with the plunger cavity; an oil inlet valve element is arranged on the second oil passage and is pressed against the second oilpassage to form a first seal surface; the first seal surface is used for opening or closing the second oil passage; an oil outlet valve seat is hermetically mounted between the oil inlet valve seat and the oil outlet connector; the oil outlet valve seat is provided with a fourth oil passage communicated with the first oil passage and the seventh oil passage; an oil outlet valve element is arranged on the fourth oil passage and is pressed against the fourth oil passage to form a second seal surface; and the second seal surface is used for opening or closing the fourth oil passage. The oil inlet / outlet valve assembly is simple in structure, the oil passages are reasonable in arrangement, the oil filling efficiency is high, and the sealing performance is high.

Description

technical field [0001] The invention relates to the technical field of common rail, in particular to a common rail high pressure oil inlet and outlet valve assembly and a common rail high pressure oil supply pump. Background technique [0002] With the gradual upgrading of emission regulations and the aggravation of the energy crisis, the requirements of diesel engines for fuel systems are increasing. In order to meet the performance indicators of diesel engines such as emissions, economy, and reliability, diesel engine fuel injection systems generally use electronically controlled high-pressure common rail systems. The high-pressure oil of the common rail injection system is established by the high-pressure oil supply pump. The high-pressure oil supply pump is a key component of the common rail system. Its reliability, oil filling efficiency, pump oil performance and other key performance indicators directly determine the common rail The performance of the system, the inlet...

AI Technical Summary

Problems solved by technology

[0004] In the current common rail system, the structure of the commonly used oil inlet and outlet valve components is relatively complicated, which leads to unreasonable layout of the oil inlet passage, which in turn leads to low oil filling efficiency and poor sealing effect, so that the high pressure oil supply pump cannot exert its maximum working capacity.

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