Lubricant composition for continuous variable transmissions...

C - Chemistry – Metallurgy – 10 – M

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C10M 163/00 (2006.01) C10M 129/10 (2006.01) C10M 135/02 (2006.01) C10M 135/18 (2006.01) C10M 137/04 (2006.01) C10M 137/08 (2006.01)

Patent

CA 2204737

A lubricant composition for continuous variable transmissions which comprises a base oil and auxiliaries incorporated therein which are a sulfur-based extreme pressure additive (A), a phosphorus-based extreme pressure additive (B), and an alkaline earth metal-based detergent (C). It is superior in wear resistance and extreme pressure properties and keeps the coefficient of friction high for a long period of time, so that it is capable of transmitting a large capacity of torque when it is applied to an continuous variable transmission. It is particularly suitable for a transmission of metal belt type.

On prépare cette composition d'huile de lubrification pour transmissions à variation continue, en mélangeant une huile lubrifiante de vase avec: A) un agent à base soufrée résistant aux pressions extrêmes, B) un agent à base phosphorée résistant aux pressions extrêmes, et C) un détergent à base d'un métal alcalino-terreux. On choisit le composant (A) parmi les graisses et huiles soufrées, les thio-carbonates, les thioterpènes, etc.; on choisit le composant (B) parmi le phosphate de tricrésyle, des sels aminés de phosphates d'alkyle et d'alkényle, etc.; et le composant (C) peut être du phénate de calcium, etc. Cette composition présente une résistance à l'usure et des propriétés en pressions extrêmes qui sont excellentes et elle peut garder longtemps un coefficient de friction élevé, se révélant ainsi utile comme lubrifiant permettant de transmettre un couple élevé dans une transmission à variation continue, du type à courroies métalliques notamment.

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