Lubricating grease used for three-pin type constant-velocity universal joint of vehicle

Abstract

The invention discloses a lubricating grease composite used for a three-pin type constant-velocity universal joint of a vehicle transmission system. The lubricating grease comprises the following components based on 100 percent weight: (a) 78 to 83 percent of base oil, (b) 9 to 12 percent of composite lithium calcium soap thickener, (c) 0.5 to 2.0 percent of sulphide isobutene and/or an organic sulfide of dibenzyl disulfide, (d) 1.0 to 3.0 percent of zinc dialkyl dithiophosphates, (e) 0.5 to 2.5 percent of molybdenum dithio phosphate, (f) 0.5 to 3.0 percent of parathion-free nitrogen-containing boric acid ester, (g) 0.5 to 1.0 percent of amine or phenolic antioxygen, and (h) 1.0 to 2.0 percent of dinonyl naphthalene sulfonic acid barium antirusting agent. The composite has a low friction coefficient, low abrasion resistance and high extreme pressure property, can reduce or prevent noise, vibration and harshness (NVH), and is particularly suitable to be used for lubricating the three-pin type constant-velocity universal joint of a vehicle transmission shaft.

Description

technical field [0001] The invention relates to a lubricating grease composition, which is mainly used for the lubricating grease composition of the three-pin constant velocity universal joint of the automobile transmission system, has low friction coefficient, low wear performance, good extreme pressure performance, and can reduce or prevent NVH. Background technique [0002] The automobile constant velocity universal joint (CVJ for short) is an important transmission component connecting the automobile gearbox and the wheel, and transmits power in the form of constant angular velocity. The three-pin CVJ is mostly installed on the inner side of the front axle and both ends of the rear axle of the car. It is the recipient of the output power of the differential, and bears the non-planar axial impact while transmitting the power. The three-pin CVJ uses three needle roller bearings as rolling elements. When power is transmitted at a certain angle, relative axial sliding occur...

AI Technical Summary

Problems solved by technology

The three-pin CVJ uses three needle roller bearings as rolling elements. When power is transmitted at a certain angle, relative axial sliding occurs between its internal parts, thereby generating friction, which will cause noise, vibration and whistling in the transmission system. Noise Vibration Harshness (NVH). In recent years, people have paid more and more attention to the NVH problem. In order to reduce or weaken the NVH phenomenon and ensure the flexible operation of the rolling elements, the required grease should be added with as little or no solid filler as possible; comparison The lubricating grease ideally used for the three-pin constant velocity universal joint should have good anti-oxidation and rust resistance, low friction coefficient, and low wear performance to reduce and prevent NVH. In addition, it is also required that the grease and The rubber dust cover outside the universal joint has good compatibility to prevent the material of the dust cover from aging, and the sealing performance is reduced, resulting in the entry of external impurities or the overflow of grease, which eventually leads to the failure of the CVJ

The grease with lithium soap thickener has poor high temperature resistance, and the maximum operating temperature is 120°C; the grease with complex calcium soap thickener has the disadvantage of hardening the storage consistency

In addition, the friction coefficient of the patent CN101511986A composition is too large, all greater than 0.08, and the anti-water and anti-rust performance of the product is not investigated.

Neither patent mentions the use of nonthion-phosphorous nitrogen-containing borates as friction reducing additives

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