Oil pump and engine lubrication system

Abstract

The invention discloses an oil pump. The oil pump comprises a pressure-limiting valve and a pump main body. The pump main body is provide with a high pressure oil cavity, a low pressure oil cavity, afeedback oil duct and an oil output duct communicating with the high pressure oil cavity. The pressure-limiting valve comprises a pressure-limiting valve element, an elastic part and a valve cylinder.The pressure-limiting valve element comprises a first valve element disk, a second valve element disk and a valve rod. The radial direction sectional area of the first valve element disk is smaller than the radial direction sectional area of the second valve element disk. The valve cylinder is provided with a first accommodating cylinder and a second accommodating cylinder. The first accommodating cylinder and the second accommodating cylinder communicate coaxially. A high pressure oil port communicating with the high pressure oil cavity and a low pressure oil port communicating with the lowpressure oil cavity are formed in the side wall of the second accommodating cylinder. The feedback oil duct communicates with the first accommodating cylinder. The elastic part is arranged inside thesecond accommodating cylinder. The high pressure oil port communicates with annular space enclosed by the first valve element disk, the second valve element disk and the valve cylinder. In the axial direction of the valve cylinder, the second valve element disk is located between the low pressure oil port and the high pressure oil port. According to the oil pump, the situation that when an enginestarts, the engine receives bigger oil pressure impact can be avoided.

Description

technical field [0001] The invention relates to the technical field of lubricating systems, in particular to an oil pump and an engine lubricating system. Background technique [0002] As an important part of the engine lubrication system, the oil pump provides a certain flow of oil to the engine to ensure the normal operation of various parts in the engine that require oil lubrication. The oil displacement of the oil pump is usually determined by the oil demand of the engine. If the oil discharge volume and oil pressure of the oil pump are too low, the friction of the engine will be too high when the engine is working, which will reduce the performance of the engine. Excessive oil discharge and oil pressure of the oil pump will not only increase power consumption and fuel consumption, but also impact the engine, especially the sealing parts in the engine, which is not conducive to the work of the engine. [0003] At present, the oil discharge volume and oil pressure outpu...

AI Technical Summary

Problems solved by technology

Therefore, compared with the normal operation of the engine, when the engine is in urgent need of oil lubrication when it is just started, the oil pump will increase the oil displacement, so that the oil pressure output by the high-pressure oil chamber of the oil pump is too high

Since the pressure limiting valve is only controlled by the oil in the main oil passage of the engine, the oil output from the high-pressure oil chamber can only act on the pressure limiting valve after it reaches the main oil passage of the engine. At this time, the high-pressure oil has entered the engine, which is easy to The engine causes a shock, which is not conducive to the work of the engine

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