Abstract: A vehicular heat management system includes a refrigerant circulation line configured to generate hot energy or cold energy depending on a flow direction of a refrigerant, a heater core side coolant circulation line configured to transfer refrigerant heat generated in the refrigerant circulation line to a heater core to heat a passenger compartment, and a battery side coolant circulation line configured to receive coolant heat of the heater core side coolant circulation line via a coolant and then circulate the coolant through a battery to preheat the battery.

Abstract: A wheel bearing assembly includes an outer race in which a plurality of rows of track portions are formed at an inner side thereof; a hub that is coaxially disposed with the outer race to be rotatably disposed in the outer race; an inner race that is engaged with a portion of an outside surface of the hub to rotate together with the hub; a first roller that is interposed between the hub and the outer race to be rolled; and a second roller that is interposed between the inner race and the outer race to be rolled.

Abstract: The present invention discloses a wheel bearing assembly according to an exemplary embodiment of the present invention may include: an outer race in which a plurality of rows of track portions are formed at an inner side thereof; a hub that is coaxially disposed with the outer race to be rotatably disposed in the outer race; an inner race that is engaged with one side outside surface of the hub to rotate together with the hub; and rollers that are interposed between the hub and the outer race and between the inner race and the outer race to be rolled.