Oil pump capable of providing lubrication for idler gear bushing

Abstract

The invention provides an oil pump capable of providing lubrication for an idler gear bushing. The oil pump comprises a pump body, a pump cover, a pump shaft, a pump driving gear, an idle gear and anidler wheel shaft, wherein a rotor cavity and an idler wheel shaft mounting hole are formed in the pump body, a bushing is arranged in a shaft hole of the idle gear, the idle gear is sleeved on the upper section of the idler wheel shaft through the bushing and can rotate around the idler wheel shaft, the lower section of the idler wheel shaft is fixedly installed in the idler wheel shaft installing hole, a first oil passage for communicating the rotor cavity and the idler shaft mounting hole is arranged between the rotor cavity and the idler wheel shaft mounting hole, an axial second oil way is arranged on the idler wheel shaft, a hole A which is in butt joint with the first oil passage is formed in one end of the second oil passage, the other end is provided with a hole B for lubricatingthe bushing, the hole A and the hole B are both radial holes, a wedge-shaped gap is formed between the idler wheel shaft and the bushing, and the hole B is aligned with the large opening part of the wedge-shaped gap. According to the structure, the optimal lubricating effect can be provided for the bushing.

Description

technical field [0001] The invention relates to a lubricating system component of an engine, in particular to an engine oil pump equipped 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 t...

AI Technical Summary

Problems solved by technology

[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 space for gears with a large diameter

Therefore, an idler gear must be added between the oil pump transmission gear and the crankshaft gear to transmit the gear drive force on the crankshaft to the oil pump transmission gear, which can reduce costs and make the engine more compact, but at the same time The following disadvantages arise: the large-displacement oil pump has a heavy load during work, and the circulating oil between the idler gear shaft hole and the idler shaft needs to be lubricated and dissipated. If there is no good lubrication between the idler gear shaft hole and the idler shaft and heat dissipation, it will cause the shaft hole of the idler gear and the shaft of the idler to be burned, and the shaft will be locked. The engine oil used for lubrication and heat dissipation when the engine is working is delivered by the oil pump. The entire engine will also suffer from cylinder scuffing and bearing bush burning due to lack of oil lubrication and heat dissipation

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