The failure rate for gears is very low but the failure rate for bearings is not so low. While there are times when using a 75W-140 or 75W-110 instead of the specified 75W-90 is appropriate, such a change should only be made on the advice of a lubrication professional. This sliding action allows the Hypoid gears to transmit greater power (the force is distributed over the sliding area), providing for smaller differentials in auto and truck applications.Ī classic error made by consumers is to buy thicker gear lube in order to get “better” protection. The spur and bevel gears are engaging and rolling in motion whereas the pinion and ring in the hypoid gears are contacting and sliding. The important concept to grasp in these gear sets is the action of contact and sliding motion. Hypoid gears facilitate the transfer of power between non-intersecting shafts at right angles. Bevel gears allow intersecting shafts to transmit power. Spur gears are simple gears with easily meshing gear teeth that transfer power between parallel shafts. In Figure One, spur gears, bevel gears and hypoid gears are displayed sun and planetary gears will be discussed with automatic transmission systems.
There are several types and various geometric shapes for gears but I will only address automotive applications. Gears transmit motion and power from one rotating shaft to another rotating shaft providing multiple applications of power transmission. First, a little knowledge of gears is important in order to understand the function of gear lubes (please refer to Figure One on the next page for this discussion).
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