Special lubricating grease for caliper guide pin

Abstract

The invention discloses special lubricating grease for a caliper guide pin, which is prepared from the following components in parts by mass: 80 to 90 parts of base oil, 0.1 to 0.5 part of nanoscale sulfide additive, 1.65 to 3 parts of extreme pressure agent, 1 to 2 parts of corrosion inhibitor, 5.5 to 7 parts of thickening agent, 0.1 to 0.5 part of peptizing agent and 0.1 to 0.5 part of antioxidant, the nanoscale sulfide additive is one or more of copper sulfide nanoparticles, nickel sulfide nanoparticles and zinc sulfide nanoparticles, and the thickening agent is formed by compounding lithium 12-hydroxystearate, dilithium azelate and palmitic acid. The nano-scale sulfide additive is added in the formula, nano-particles are large in surface area and active in chemical property, the nano-particles and the abraded surface are prone to chemical reaction, a sediment film and a chemical reaction film are formed, and the fretting wear of the caliper guide pin can be obviously improved.

Description

technical field [0001] The invention relates to lubricating grease, in particular to a special lubricating grease for a caliper guide pin. Background technique [0002] Caliper guide pin lubricating grease can eliminate brake squeaking, prevent damage during the break-in period from being seized by heat, facilitate disassembly, and play a decisive role in the normal use of caliper guide pins. The guide pin of the caliper has no relative movement macroscopically, but the contact surface between the guide pin and the pin seat has a slight tangential or normal movement. And the brake caliper is located in the cavity inside the wheel, directly subjected to the corrosion of the ambient air, and also bears the impact of the splash caused by the rotation of the wheel. The convex surface formed by the contact surface of the guide pin and the pin seat due to surface roughness or pollution factors is prone to abnormally high temperature during the slight movement process, resulting i...

AI Technical Summary

Problems solved by technology

The convex surface formed by the contact surface of the guide pin and the pin seat due to surface roughness or pollution factors is prone to abnormally high temperature during the slight movement process, resulting in adhesion of the contact point, resulting in surface metal wear, and the wear debris generated by the wear further deteriorates the environment of the contact surface , leading to increased fretting wear

[0003]In recent years, lithium complex greases have been widely used in the automotive field, but this type of grease has poor anti-fretting wear performance when used for caliper guide pins. After a period of time, the lubricating grease in this part will gradually volatilize when heated, turn black and dry, and thus the lubrication will fail.

After a long period of time, the rust of the guide pin will cause the movement of the guide pin to be stuck, and the brake caliper will be difficult to return and drag the brakes, causing abnormal noise. When braking at high speed, the left and right brake forces are inconsistent, which can easily lead to dangerous situations.

The Chinese invention patents whose publication numbers are CN 104498158A and CN107541316A disclose silicone grease with a low coefficient of friction, but they also cannot improve the fretting wear of the caliper guide pins

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