An improved traction fluid which is prepared by compounding an ester represented by general formula (I) (wherein A′ represents an ester bond of -COO- or -OOC-, n represents 1 to 14, R₁ represents a hydrogen atom or an alkyl group hav­ing 1 to 8 carbon atoms, R₂ groups are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms) or its derivatives with 0.1 to 95 wt% of a hydrocarbon polymer or an ester polymer. This fluid is used for power transmissions, particularly a traction drive apparatus.
ABSTRACT
An improved traction fluid characterized by being a blend of (i) an ester or its derivative, in which the ester is represented by the general formula: wherein A′ is an ester linkage of -COO- or -OOC-, n is an integer of 1 to 14, R₁ is a member selected from among the hydrogen atom and alkyl groups having 1 to 8 carbon atoms, and R₂s are the same or different and are a member selected from among a hydrogen atom and alkyl groups having from 1 to 3 carbon atoms, with (ii) from 0.1 to 95 % by weight of a hydrocarbon polymer or polymeric ester.
This fluid is advantageously used for power drive transmissions, particularly for traction drive devices.