Coating material for preventing engine crankshaft from being locked, and preparation method and application method of coating material

Abstract

The invention discloses a coating material for preventing an engine crankshaft from being locked, and a preparation method and an application method of the coating material. The coating material comprises the following raw materials in parts by weight: PAG (Polyalkylene Glycol ethers) polyether base oil, modified plant-based synthetic ester oxide sunflower oil, epoxy resin, organic molybdenum, tungsten disulfide powder, tungsten diselenide powder, carbon monofluoride powder, polyphenyl, a fire retardant, an antiwear agent and an antioxidant. The coating material is coated on a crankshaft neck surface and / or bearing bush surface between a crankshaft neck and a bearing bush (tile), so that a protective coating which is lubricant enough, and not easy to wash off or damage, and can bearing extremely high temperature is provided under the condition that the engine oil cannot provide effective lubricating due to poor quality, or cannot provide an enough lubricating effect between the crankshaft and a connecting rod due to reduction of the engine oil, the coating material has excellent waterproof properties, anti-rust characteristics, anti-corrosion property, and micro-grinding resistance on metal parts, can form solid dry film lubrication under the environment above 200 DEG C, and can play the roles in lubricating and preventing metal from being locked by sintering at the temperature which can be up to 1400 DEG C, and the locking phenomenon between the crankshaft and the connecting rod caused by dry friction between the tile and the crankshaft is effectively avoided.

Description

technical field [0001] The invention relates to the field of coating materials, in particular to a coating material used for preventing engine crankshafts from locking. Background technique [0002] The piston and connecting rod mechanism are connected to the crankshaft. The crankshaft bears the pressure generated when the fuel mixture is burned through the piston and the connecting rod, and converts the reciprocating motion of the piston into rotary motion. A sliding part between the crankshaft and the connecting rod is called the bearing bush, which together with the oil forms a sliding bearing. Sliding friction is used between the crankshaft and the big end of the connecting rod of the four-stroke engine. There are two upper and lower semicircular tiles (that is, bearing bushes) in the big end hole of the connecting rod. The tiles and engine oil together form a sliding bearing. The tiles are made of thin steel sheets, and a friction-reducing alloy layer is cast on the in...

AI Technical Summary

Problems solved by technology

Once there is not only no oil between the crankshaft and the connecting rod, but even the friction-reducing alloy layer lubrication is lost, it will cause the crankshaft and the connecting rod to lock up

And when the temperature is too high, the radial radius of the crankshaft increases, and the bearing bush (tile) swells tightly, which is also one of the reasons for the lock between the crankshaft and the connecting rod. In addition, insufficient lubrication caused by inferior oil is also easy lead to deadlock

[0003] Therefore, what needs to be solved is how to avoid dry friction between the tiles and the crankshaft and eventually cause the crankshaft and the generation of locking phenomenon between the connecting rod