Fuel oil pump for diesel engine

Abstract

A fuel oil pump for diesel engine is composed of pump body, manual pump assembly and motor-driven pump assembly. The working cavities of the said two pumps are communicated to each other. The motor-driven pump assembly consists of oil-sucking inlet joint, plunger and cam transmission mechanism. It features that the said oil-sucking inlet joint has a one-way valve. Its advantages are high supplied oil valume, high oil supply stability and high reliability.

Description

Technical field [0001] The invention belongs to the field of diesel engines, and relates to a fuel delivery pump of a diesel engine fuel supply system. Background technique [0002] Diesel engine fuel delivery pump uses camshaft power to deliver the fuel in the fuel tank to the high-pressure pump inlet when the engine is working. When the engine is not working, you can manually pump oil to fill its outlet to the high-pressure pump inlet if necessary. Between the piping cavity. The current development trend of diesel engines is high-horsepower models, which require large fuel supply. Existing fuel delivery pumps have structural defects, and it is difficult to increase the fuel supply; the large pulsation of the fuel supply flow makes it difficult to solve the problem of fuel leaking into the cylinder to dilute the lubricating oil, causing friction and strain, and the oil leakage from the pump body. Insufficient oil consumption and environmental pollution. The specific performance ...

AI Technical Summary

Problems solved by technology

The existing fuel pump has structural defects, and it is difficult to increase the fuel supply; the pulsation of the fuel supply flow is large and it is difficult to solve the problem that the fuel leaks into the cylinder to dilute the lubricating oil, causing friction and strain, and the oil leaks back outside the pump body, adding to the Large engine oil consumption, environmental pollution, etc.

The specific performance is: there is a one-way valve at the oil outlet. When the plunger of the motor pump moves upward and the working chamber of the motor pump enters the oil suction working condition, the one-way valve is often not fully opened, and part of the oil outside the oil suction port is pressed back into the oil tank. The phenomenon that the working chamber does not absorb enough oil, resulting in the reduction of pump oil volume and instability

The existence of this structural defect makes it difficult to increase the oil supply, and the pulsation of the oil supply flow is large

The plunger or ejector rod of the oil pump is easy to get stuck, which will cause the main engine to stop at any time; the fuel is easy to leak into the cylinder to dilute the lubricating oil, causing friction and strain, and damage to the cylinder, crankshaft and other pipe parts.

The technical requirements for the installation of the combined sealing ring in the cam transmission mechanism are very high, and there are positional requirements in both radial and axial directions, that is, the position of the sealing ring is unique, the assembly is difficult, and it is easy to be blocked

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