Sealing structure

Patent metadata

Field	Value
Publication number	US-9927031-B2
Application number	US-201515526112-A
Country	US
Kind code	B2
Filing date	Nov 6, 2015
Priority date	Nov 18, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A sealing structure that allows for formation of a side lip, as well as a labyrinth structure between an oil seal and a torsional vibration damper, even when a reinforcing ring has a short inward flange part. The sealing body 120 includes a side lip 124 extending from near a distal end of an inward flange part 112 of the reinforcing ring 110 radially inward and further toward an air side (A) than a dust lip 122 to a position not as far as the outer circumferential surface of a tubular part 210 . The tubular part 210 includes a small-diameter part 211 on which the dust lip 122 slides, and a large-diameter part 212 on the air side (A). The large-diameter part 212 has a tapered surface 212 a formed on an outer circumferential surface thereof that reduces in diameter toward the air side (A). An annular gap S is formed between this tapered surface 212 a and an inner circumferential surface of the side lip 124.

First claim

The invention claimed is:

1. A sealing structure comprising:
a torsional vibration damper having a tubular part to be attached to a crankshaft; and
an oil seal that seals an annular gap between an inner circumferential surface of a shaft hole in a housing for the crankshaft to pass through and an outer circumferential surface of the tubular part,
the oil seal including:
a reinforcing ring having a cylindrical part, and an inward flange part provided at an end on an opposite side from a sealed-fluid side of the cylindrical part; and
a sealing body made of an elastic material and provided integrally with the reinforcing ring,
the reinforcing ring being configured such that a portion on an end face of the inward flange part on the opposite side from the sealed-fluid side is exposed,
the sealing body including:
an oil lip extending from near a distal end of the inward flange part toward the sealed-fluid side and slidable on the outer circumferential surface of the tubular part;
a dust lip extending from near the distal end of the inward flange part toward the opposite side from the sealed-fluid side and slidable on the outer circumferential surface of the tubular part; and
a side lip extending from near the distal end of the inward flange part radially inward and further toward the opposite side from the sealed-fluid side than the dust lip to a position not as far as the outer circumferential surface of the tubular part,
and
the tubular part including a small-diameter part on which the dust lip slides, and a large-diameter part on an opposite side from the sealed-fluid side of the small-diameter part,
an outer circumferential surface of the large-diameter part including a tapered surface that reduces in diameter toward the opposite side from the sealed-fluid side, an annular gap being formed between the tapered surface and an inner circumferential surface of the side lip.

2. A sealing structure comprising:
a torsional vibration damper having a tubular part to be attached to a crankshaft; and
an oil seal that seals an annular gap between an inner circumferential surface of a shaft hole in a housing for the crankshaft to pass through and an outer circumferential surface of the tubular part,
the oil seal including:
a reinforcing ring having a cylindrical part, and an inward flange part provided at an end on an opposite side from a sealed-fluid side of the cylindrical part; and
a sealing body made of an elastic material and provided integrally with the reinforcing ring,
the reinforcing ring being configured such that a portion on an end face of the inward flange part on the opposite side from the sealed-fluid side is exposed,
the sealing body including:
an oil lip extending from near a distal end of the inward flange part toward the sealed-fluid side and slidable on the outer circumferential surface of the tubular part;
a dust lip extending from near the distal end of the inward flange part toward the opposite side from the sealed-fluid side and slidable on the outer circumferential surface of the tubular part; and
a side lip extending from near the distal end of the inward flange part radially inward and further toward the opposite side from the sealed-fluid side than the dust lip to a position not as far as the outer circumferential surface of the tubular part, and
the tubular part including a small-diameter part on which the dust lip slides, and a large-diameter part on an opposite side from the sealed-fluid side of the small-diameter part,
an outer circumferential surface of the large-diameter part including a tapered surface that reduces in diameter toward the opposite side from the sealed-fluid side, an annular gap being formed between the tapered surface and an inner circumferential surface of the side lip;
wherein the inner circumferential surface of the side lip is formed of a tapered surface with a taper angle substantially equal to a taper angle of the tapered surface formed on the large-diameter part.

Assignees

• Nok Corp

Inventors

• OMOTO Shinya
• Nakashima Toru
• Matsui Hiroki
• Kamiya Yusuke

Classifications

• F16F15/126

  consisting of at least one annular element surrounding the axis of rotation · CPC title

• F16J15/3204 Primary

  with at least one lip · CPC title

• F16J15/447

  Labyrinth packings · CPC title

• F16J15/164 Primary

  the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid · CPC title

• F16F2230/30

  Sealing arrangements · CPC title