Viscous fluid type heat generator with means for maintaining optimum lubricating condition of a bearing

A viscous fluid type heat generator comprising:

• front and rear housings for defining therein, at least a heat generating chamber having inner walls;
• a heat receiving chamber arranged in at least one of said front and rear housings separated from said heat generating chamber and defining therein a fluid flow passage extending in close relation with said heat generating chamber and permitting a heat exchanging liquid to circulate therethrough;
• a drive shaft rotatably supported by said front housing via bearing means;
• a rotor element mounted on the drive shaft so as to be rotated therewith within said heat generating chamber and having outer faces
• viscous fluid supplied in a space extending between said inner walls of said heat generating chamber and said outer faces of said rotor element to generate heat in response to rotation of said rotor element;
• and
• an intermediate isolation means disposed between said heat generating chamber and said bearing means for providing a thermal isolation therebetween wherein said intermediate isolation means comprises a shaft sealing means arranged in said front housing for fluidly sealing around said drive shaft.