[특허]Hydrodynamic seal

[미국특허] Hydrodynamic seal 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16C-033/78
출원번호	US-0079175 (1987-07-29)
발명자 / 주소	Otto Dennis L. (Malvern OH)
출원인 / 주소	The Timken Company (Canton OH 02)
인용정보	피인용 횟수 : 35 인용 특허 : 0

초록 ▼

A hydrodynamic seal suitable for closing the end of a tapered roller bearing includes a seal case which is pressed into a counterbore at the end of the bearing cup and an elastomeric sealing element having a primary lip and secondary lip which cooperate with a sealing surface on the thrust rib of the bearing cone to effect a live seal along that surface. The primary lip is spaced from the sealing surface of the cone thrust rib and has pumping cavities which open both toward the sealing surface and toward the interior of the bearing. Moreover, they are configured to pump lubricant that enters them back toward the interior of the bearing. An annular space exists between the primary and secondary lips and the pumping cavities also open into this space at small vent apertures, so that any increase in pressure within the interior of the bearing is transmitted through the pumping cavitis to the annular space. The secondary lip actually contacts the sealing surface of the thrust rib, but is oriented oblique to that surface, so that a pressure increase transmitted to the annular cavity causes the secondary lip to lift slightly away from the sealing surface and relieve the increase in pressure.

대표청구항 ▼

In combination with a pair of machine components which are arranged such that one will rotate relative to the other about an axis of rotation, one component being hollow and the other component being received in the hollow component and having a sealing surface that is concentric to and presented away from the axis of rotation, an improved seal for isolating within the hollow component a region that contains a lubricant, said seal comprising: a mount attached to the hollow component such that a static seal exists between the mount and the hollow component; a primary seal lip carried by the mount and having spaced apart inner and outer end faces, each located at an angle with respect to the sealing surface, and a circumferential face that extends between the end faces and is presented toward the sealing surface, the inner end face being presented toward and exposed to the region isolated by the seal and the outer end face being presented away from the region isolated by the seal, the circumferential face being concentric to and substantially parallel to the sealing surface, but being spaced outwardly from the sealing surface so that a clearance exists between the circumferential face and the sealing surface, the primary lip further having a plurality of pumping cavities arranged at intervals circumferentially along it, with each pumping cavity opening out of both the inner end face and the circumferential face, each pumping cavity being defined by faces including side faces which diverge toward the inner end face and are located at an angle with respect to the direction of relative rotation so that lubricant which enters the cavity will be deflected axially toward the region isolated by the seal irrespective of the direction of relative rotation, the faces of each pumping cavity further being arranged to impart a generally wedge shaped cross-sectional configuration to the cavity with at least one of the faces diverging from the axis of rotation toward the inner end face, whereby lubricant which enters the cavity will also be directed generally away from the axis of rotation under the influence of centrifugal force; and a secondary lip also carried by the mount and being axially offset from the primary lip so that an annular space exists between the two lips, the secondary lip contacting the sealing surface along the full circumference of the sealing surface and being oriented with respect to the sealing surface such that an increase in pressure within the annular space will cause the secondary lip to separate slightly from the sealing surface and vent the annular space.

이 특허를 인용한 특허 (35) 인용/피인용 타임라인 분석

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[미국특허] Hydrodynamic seal 원문보기

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