ROTATING PUMPING APPARATUS WITH SEAL MECHANISM

摘要

A rotating pumping apparatus is provided which may be employed in an automotive brake system. The rotating pumping apparatus includes a sealing member and an oil seal which are disposed around a pump drive shaft, and lubricating grease disposed between the oil seal and the pump drive shaft. The sealing member is made up of a resinous ring and a rubber cup. The sealing member has formed therein a labyrinthine flow path which extends from the resinous ring to the rubber cup. The labyrinthine flow path is designed to permit fluid to flow therethrough and create the resistance to flow of the lubricating grease to avoid leakage of the grease outside the sealing member.

主权项

1. A rotating pumping apparatus comprising:
a rotating pump; a shaft which drives the rotating pump; a casing which has formed therein a hole in which the shaft is disposed; a sealing member which is disposed around the shaft between an inner periphery of the hole and an outer periphery of the shaft and creates a hermetical seal between the inner periphery of the hole and the shaft, the sealing member being equipped with a resinous ring and a rubber cup fit on an outer periphery of the resinous ring, the rubber cup having formed in the outer periphery thereof a first groove which extends in an axial direction of the shaft; an oil seal which is disposed around the shaft between the inner periphery of the hole and the outer periphery of the shaft and creates a hermetical seal between the inner periphery of the hole and the shaft; and lubricating grease disposed between the oil seal and the shaft, wherein the resinous ring has an end surface which faces the oil seal and is located closer to the oil seal than the rubber cup is, the end surface having formed therein a second groove which extends from an inner space of the resinous ring to an outer periphery of the resinous ring, and wherein the second groove defines at least a portion of a labyrinthine flow path which extends from the inner space of the resinous ring to the first groove and has sections extending in a radial and a circumferential direction of the resinous ring, respectively.