Lubricants for improving fatigue life
AssigneeIdemitsu Kosan Co., Ltd.
InventorsTakao Katayama, Masahiko Takesue
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Abstract
A lubricant for improving fatigue life is described, which comprises: (1) a lubricating base material, and (2) a compound having alkylthiocarbamoyl groups represented by the general formula (i): ##STR1## or (1) a lubricating base material, (2) a compound having alkylthiocarbamoyl groups represented by the general formula (i), (3) a molybdenum compound represented by the general formula (ii): ##STR2## or by the general formula (iii): ##STR3## and/or an ester compound. All the symbols in the formulae are as defined in the appended claims. This lubricant greatly prolongs the fatigue life of gears, etc.
Claims20
A lubricant for improving fatigue life which comprises:
- (1) a lubricating base material;
- and
- (2) a compound having alkylthiocarbamoyl groups represented by the formula (i):
- ##STR54## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each an alkyl group containing from 1 to 20 carbon atoms, R.sup.1 and R.sup.2, or R.sup.3 and R.sup.4 may be bound to each other to form a ring, and (A) is selected from the group consisting of S, S--S, S--S--S, S--S--S--S, S--S--S--S--S, and S--S--S--S--S--S.
A lubricant for improving fatigue life which comprises:
- (1) a lubricating base material;
- (2) a compound having alkylthiocarbamoyl groups represented by formula (i):
- ##STR55## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each an alkyl group containing from 1 to 20 carbon atoms, R.sup.1 and R.sup.2, or R.sup.3 and R.sup.4 may be bound to each other to form a ring, and (A) is S, S--S, S--S--S, S--S--S--S, S--S--S--S--S, S--S--S--S--S--S, S--CH.sub.2 --S, S--CH.sub.2 CH.sub.2 --S, or S--CH.sub.2 CH.sub.2 CH.sub.2 --S;
- and at least one compound selected from
- (3) a molybdenum compound represented by formula (ii) or (iii):
- ##STR56## wherein R.sup.5 and R.sup.6 each contain from 1 to 30 carbon atoms and are each selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, and an
- alkylaryl group, and m is a real number meeting the requirement of 0.ltoreq.m.ltoreq.4;
- ##STR57## wherein R.sup.7 and R.sup.8 each contain from 1 to 30 carbon atoms and are each selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, and an alkylaryl group, and n is a real number meeting the requirement of 0.ltoreq.n.ltoreq.4;
- and
- (4) an ester compound.
Dependencies are inferred from the claim text.