Structure-optimized machine oil pump with idle gear

Abstract

The invention provides a structure-optimized machine oil pump with an idle gear. The machine oil pump comprises a pump body, a pump cover, an idle gear shaft, the idle gear and a bolt; an oil cavity is formed in the pump body; an idle gear shaft mounting hole is formed in the pump cover; the idle gear shaft is provided with an axial bolt mounting hole and a lubricating through hole intersected with the bolt mounting hole; the idle gear sleeves the idle gear shaft; a screw plug fixes the idle gear shaft on the pump cover; the diameter of the bolt is smaller than the aperture of the bolt mounting hole of the idle gear shaft; an annular gap is formed between the bolt and the inner wall of the bolt mounting hole; an oil passing groove is formed in the side, near an oil cavity, of the round hole bottom surface of the idle gear shaft mounting hole; an inclined oil hole communicating with the oil cavity is drilled in the pump cover through the oil passing groove; high-pressure oil in the oilcavity flows into a gap between an idle gear bushing and the idle gear shaft through the inclined oil hole, the oil passing groove, the annular gap and the lubricating through hole in sequence; and oil leakage grooves are formed in two end surfaces of a shaft table of the idle gear.

Description

technical field [0001] The invention relates to a lubricating system component of an engine, in particular to an engine oil pump with an idler gear. Background technique [0002] The existing large-displacement oil pump is usually installed in the oil casing below the engine crankcase, and the gear on the engine crankshaft drives the transmission gear of the oil pump. Since the engine crankcase is large, the center distance between the oil pump transmission shaft and the crankshaft is relatively large , under the premise that the transmission ratio is determined, if we simply rely on increasing the diameter of the oil pump transmission gear and the gear on the crankshaft to match the center distance, it will inevitably cause the gear on the crankshaft and the oil pump transmission gear to be too large, which will increase the cost. The engine also doesn't have enough room for gears with a large diameter. Therefore, an idler gear must be added between the oil pump transmissi...

AI Technical Summary

Problems solved by technology

Due to the shortcomings of heavy cast iron, if the material of the pump body and pump cover is changed to cast aluminum, although the weight can be reduced, the idler shaft cannot be installed on the aluminum pump body or pump by interference fit. The cover is covered, so a new installation method and structure must be adopted to adapt to the aluminum pump body or pump cover, and this new structure also needs to solve the problem of lubrication and heat dissipation between the inner wall of the idler gear shaft hole and the idler shaft

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