Patent ID: 9638328
Date: 2017-05-02
CPC Classifications: B60T,F16J

Claim:
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, wherein the second groove defines a labyrinthine flow path which has sections extending in a radial direction and a circumferential direction of the resinous ring, respectively, wherein the sections of the second groove extending in the radial and circumferential directions of the resinous ring are connected through a bend, wherein a length of the second groove is greater than a width in a radial direction of the resinous ring, and the second groove has an inlet and an outlet which are offset from each other in a circumferential direction of the resinous ring; wherein the sections extending in the radial direction and the circumferential direction include a first radial section, a second radial section and a circumferential section, the first and second radial sections being in fluid communication through the circumferential section; and wherein a first bend connects the first radial section with the circumferential section and a second bend connects the second radial section with the circumferential section.