Nok Corporation

Shinya Omoto

Toru Nakashima

Yusuke Kamiya

Hiroki Matsui

Hirotaka Mizuta

Shota Toma

Akihiro Komyo

A sealing structure with an annular pocket and a sealing device includes an annular pocket and a sealing device. The pocket is provided in a slinger, and the sealing device is attached to a housing of a differential device. The slinger is arranged on an output shaft of the differential device. A recessed part of the pocket is defined by an inner peripheral tubular portion, an outer peripheral tubular portion and a bottom portion of the slinger. The outer peripheral surface of the pocket is formed in the outer peripheral tubular portion of the slinger. The outer peripheral surface of the pocket increases in diameter toward the outside in an axis direction. A side lip of the sealing device extends in the outward direction, and an annular gap is formed between the side lip and the pocket.

Sealing structure with annular pocket and sealing device

To provide a sealing structure with an annular pocket and a sealing apparatus that can efficiently reduce exposure of a seal lip of the sealing apparatus to foreign matter entering from the outside. In a sealing structure () with a torsional damper and an oil seal, a hub pocket () has an outer circumferential surface () in an annular shape centered about an axis x that extends along the axis x and is formed in an outer shell part () that is opposed to a shaft member on an outer periphery side, a dust discharging hole () or a dust discharging groove () connected to the hub pocket () is formed in the outer shell part (), and the dust discharging hole () or the dust discharging groove () is inclined at a predetermined angle in such a manner that a discharge opening (out) is directed in an opposite direction to a rotational direction of the shaft member.

Sealing structure with annular pocket and sealing apparatus

A sealing structure with a torsional damper and an oil seal includes a damper pulley serving as a torsional damper and an oil seal. The damper pulley has an annular hub pocket that is recessed in the outer side direction and extends in the circumferential direction along a boss part of a hub. The oil seal includes a side lip that extends toward the outer side. An outer circumferential surface of the hub pocket increases in a diameter toward the outer side, the side lip of the oil seal does not enter inside the hub pocket, and an annular gap is formed between an outer side end of the side lip and an inner side end of the outer circumferential surface of the hub pocket.

Sealing structure with torsional damper and oil seal

A sealing structure allows for formation of a labyrinth structure between an oil seal and a torsional vibration damper even when the oil seal does not include a side lip. The oil sealincludes an oil lipprovided such as to be slidable on an outer circumferential surface of a tubular part, and a dust lipprovided further on an air side (A) than the oil lipand slidable on the outer circumferential surface of the tubular part. An annular memberis further provided, which is fixed to the outer circumferential surface of the tubular partfurther on the air side (A) than the dust lipand covering an outer circumferential surface of the dust lipsuch that there is a gap between the annular memberitself and the outer circumferential surface of the dust lip

Sealing structure

A sealing structure 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 bodyincludes a side lipextending from near a distal end of an inward flange partradially inward and further toward an air side (A) than a dust lipto a position not as far as the outer circumferential surface of a tubular part. An annular memberis further provided, which is fixed to the outer circumferential surface of the tubular partfurther on the air side (A) than the side lipand covering an outer circumferential surface of the side lipsuch that there is a gap between the annular memberitself and the outer circumferential surface of the side lip

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 bodyincludes a side lipextending from near a distal end of an inward flange partof the reinforcing ringradially inward and further toward an air side (A) than a dust lipto a position not as far as the outer circumferential surface of a tubular part. The tubular partincludes a small-diameter parton which the dust lipslides, and a large-diameter parton the air side (A). The large-diameter parthas a tapered surfaceformed on an outer circumferential surface thereof that reduces in diameter toward the air side (A). An annular gap S is formed between this tapered surfaceand an inner circumferential surface of the side lip

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Tottori, Japan

Shinya Omoto