Class / Patent application number | Description | Number of patent applications / Date published |
277559000 | Hydrodynamic sealing feature | 31 |
20090001671 | Rotary seal with improved film distribution - The present invention is a generally circular rotary seal that establishes sealing between relatively rotatable machine components for lubricant retention and environmental exclusion, and incorporates seal geometry that interacts with the lubricant during relative rotation to distribute a lubricant film within the dynamic sealing interface. The features of a variable inlet size, a variable dynamic lip flank slope, and a reduction in the magnitude and circumferentially oriented portion of the lubricant side interfacial contact pressure zone at the narrowest part of the lip, individually or in combination thereof, serve to maximize interfacial lubrication in severe operating conditions, and also serve to minimize lubricant shear area, seal torque, seal volume, and wear, while ensuring retrofitability into the seal grooves of existing equipment. | 01-01-2009 |
20090194952 | Multi-Directional Shaft Seal - A dynamic seal provides for the return of captured lubricant to the lubricant side regardless of the direction of rotation between the seal and the shaft. The seal uses bi-directional pumping elements to facilitate the hydrodynamic pumping of the captured lubricant in response to relative rotation. The seal includes a valve portion that can change a pumping rate of particular pumping elements such that more lubricant is pumped toward the lubricant side than the non-lubricant side. | 08-06-2009 |
20090250881 | LOW TORQUE HYDRODYNAMIC LIP GEOMETRY FOR BI-DIRECTIONAL ROTATION SEALS - A hydrodynamically lubricating geometry for the generally circular dynamic sealing lip of rotary seals that are employed to partition a lubricant from an environment. The dynamic sealing lip is provided for establishing compressed sealing engagement with a relatively rotatable surface, and for wedging a film of lubricating fluid into the interface between the dynamic sealing lip and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or the counter-clockwise direction. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive to efficient hydrodynamic wedging. Skewed elevated contact pressure zones produced by compression edge effects provide for controlled lubricant movement within the dynamic sealing interface between the seal and the relatively rotatable surface, producing enhanced lubrication and low running torque. | 10-08-2009 |
20100109252 | OIL SEAL - For an oil seal ( | 05-06-2010 |
20100181732 | SEAL - A seal includes a supporting body; a disk-shaped sealing element fixed to the supporting body so as to form a static seal and to include a free end; and a sealing body disposed at the free end so as to form a dynamic sealing edge, wherein the sealing body includes a material that is a different from a material of the sealing element. | 07-22-2010 |
20100219588 | Seal with Spiral Grooves and Contamination Entrapment Dams - A dynamic seal utilizes a groove on the active side of the seal to capture a leaked lubricant and pump the lubricant back into the lubricated side of the seal. The groove stops short of the leading edge of the seal that faces the lubricant side forming a static dam between the termination point of the groove and the seal edge. When the fluid pressure within the groove exceeds the opening pressure for the seal lip, the lubricant within the groove is pumped back into the lubricant side of the seal. The groove can have an induction zone wherein the fluid pressure rise is gradual and a booster zone wherein the fluid pressure rise is relatively faster than in the induction zone. The booster zone is disposed adjacent the static dam. Bars are provided across the spiral grooves to prevent contaminants from reaching and becoming trapped in the booster zone. | 09-02-2010 |
20100237567 | SEALING ELEMENT - A sealing element for sealing a shaft, which is provided for rotating in accordance with its design, at a through-opening of a housing part for the shaft, comprising the following features:
| 09-23-2010 |
20100244387 | HYDRODYNAMIC SEALING ELEMENT - A sealing element of a hydrodynamic seal for relatively rotating elements, having a sealing surface ( | 09-30-2010 |
20100244388 | SEALING DEVICE - To prevent entry of muddy water, a sealing device ( | 09-30-2010 |
20100259014 | SEALING DEVICE - To prevent muddy water intrusion into a sliding section (S | 10-14-2010 |
20100259015 | HYDRODYNAMIC SEAL WITH IMPROVED EXCLUSION AND LUBRICATION - A hydrodynamic sealing assembly including a first machine component defining a seal groove and a second machine component having a rotatable surface that is rotatable relative to the first machine component. A hydrodynamic seal including a seal body of generally ring-shaped configuration having a circumference and the seal body includes a sealing lip having a sealing surface contacting the relatively rotatable surface to establish a sealing interface between the sealing lip and the relatively rotatable surface. The sealing lip includes an exclusion edge of abrupt substantially circular form that is substantially aligned with a direction of relative rotation between the sealing lip and the relatively rotatable surface in a compressed, installed condition of the seal and wherein the exclusion edge is non-circular and slightly wavy in an uncompressed, uninstalled condition of the hydrodynamic seal. | 10-14-2010 |
20100264603 | ROTARY SEAL WITH TRUNCATED WAVE FORM - The present invention is a generally circular rotary seal that establishes sealing between relatively rotatable machine components for lubricant retention and environmental exclusion, and incorporates seal geometry that interacts with the lubricant during relative rotation to distribute a lubricant film within the dynamic sealing interface. A preferably curved elevated contact pressure zone serves to maximize interfacial lubrication in critical areas during severe operating conditions by utilizing lubricant that would otherwise escape at the trailing edge of the hydrodynamic waves. The zones are produced by geometry that serves to minimize lubricant shear area, seal torque, seal volume, and wear, while ensuring retrofitability into the seal grooves of existing equipment. | 10-21-2010 |
20100264604 | Dynamic Seal - A dynamic shaft seal assembly is provided including a dynamic seal for engaging a rotary shaft. The dynamic seal includes a base portion that is mounted within a casing and has an axially extending barrel portion extending from a radially inner end of the base portion. The axially extending barrel portion terminates in a radially extending leg portion which extends inwardly from an end of the axially extending portion. A generally conically shaped seal portion extends from an end of the radially extending portion and the seal portion includes a radially inner face engaging the shaft and a radially outer face having a stiffening bead integrally formed thereon. The stiffening bead reduces the seal's propensity for “bell mouthing” while the axially extending barrel portion provides improved shaft followability for the dynamic seal. | 10-21-2010 |
20110024989 | Dynamic Seal - A dynamic shaft seal assembly is provided including a dynamic seal for engaging a rotary shaft. The dynamic seal includes a base portion that is mounted within a casing and has an axially extending barrel portion extending from a radially inner end of the base portion. The axially extending barrel portion terminates in a radially extending leg portion which extends inwardly from an end of the axially extending portion. A generally conically shaped seal portion extends from an end of the radially extending portion and the seal portion includes a radially inner face engaging the shaft and a radially outer face having a stiffening bead integrally formed thereon. The stiffening bead reduces the seal's propensity for “bell mouthing” while the axially extending barrel portion provides improved shaft followability for the dynamic seal. | 02-03-2011 |
20110024990 | Dynamic Seal - A dynamic shaft seal assembly is provided including a dynamic seal for engaging a rotary shaft. The dynamic seal includes a base portion that is mounted within a casing and has an axially extending barrel portion extending from a radially inner end of the base portion. The axially extending barrel portion terminates in a radially extending leg portion which extends inwardly from an end of the axially extending portion. A generally conically shaped seal portion extends from an end of the radially extending portion and the seal portion includes a radially inner face engaging the shaft and a radially outer face having a stiffening bead integrally formed thereon. The stiffening bead reduces the seal's propensity for “bell mouthing” while the axially extending barrel portion provides improved shaft followability for the dynamic seal. | 02-03-2011 |
20110204579 | Seal with Spiral Grooves and Mid-Lip Band - A dynamic seal advantageously utilizes a plurality of grooves on the active side or surface of the seal to capture a leaked lubricant and hydrodynamically pump the lubricant back into the lubricated side of the seal. The grooves are interrupted at an intermediate location by a continuous circumferential band that aids in preventing leakage past the band when the shaft is not rotating and the grooves on both sides of the band pump contaminants away from the sealing lip. | 08-25-2011 |
20110215535 | Low and Reverse Pressure Application Hydrodynamic Pressurizing Seals - The present invention relates to circumferential seal ring segments positioned around a rotating shaft so as to prevent fluids from leaking from a lubricant sump during both low and high pressure conditions. The circumferential seal is comprised of a plurality of adjoining annular ring segments facing the rotating shaft. Each sealing ring segment includes a dead end circumferential groove on a shaft-side face of each sealing ring such that, when the segments are joined, the circumferential dead end groove of each segment extends arcuately in the direction of shaft rotation. At least one additional groove is contained on the shaft-side face of each sealing ring segment. The additional groove(s) directs and creates pressurized air within the dead end circumferential groove, either directly or indirectly maintaining a seal between the ring segments and the shaft. A bleed hole may also be provided to create a seal between each sealing segment. | 09-08-2011 |
20110278801 | NECK SEAL - A seal is disclosed for use in a rolling mill oil film bearing in which a sleeve is mounted on a roll neck for rotation therewith, the sleeve is journalled for rotation in a fixed bushing, and a flow of oil exits from between the sleeve and the bushing. The seal comprises a flexible circular seal body adapted to be mounted on and to rotate with the roll neck. Circumferentially spaced impellers project from the seal body. The impellers are rotatable with the seal body and serve to rotatively propel oil exiting from between the sleeve and bushing. | 11-17-2011 |
20110316238 | Radial Shaft Sealing Ring, and Method of Fabricating a Radial Shaft Sealing Ring - A radial shaft sealing ring for sealing of a casing part of a motor vehicle engine or gearbox, with a supporting body and a sleeve-type sealing lip connected to the supporting body and bent towards the side to be sealed, which sealing lip lies on an axial length L on the shaft and has a conveying groove in the area of contact with the shaft for conveying of medium back into the volume to be sealed, and which sealing lip has a sufficient bending elasticity to achieve a sufficient contact pressure without the use of additional means, wherein the material of the sealing lip essentially consists of a high temperature cross-linked LSR liquid silicone material. | 12-29-2011 |
20120013078 | LOW TORQUE HYDRODYNAMIC LIP GEOMETRY FOR ROTARY SEALS - A hydrodynamically lubricating geometry for the generally circular dynamic sealing lip of rotary seals that are employed to partition a lubricant from an environment. The dynamic sealing lip is provided for establishing compressed sealing engagement with a relatively rotatable surface, and for wedging a film of lubricating fluid into the interface between the dynamic sealing lip and the relatively rotatable surface in response to relative rotation that may occur in the clockwise or the counter-clockwise direction. A wave form incorporating an elongated dimple provides the gradual convergence, efficient impingement angle, and gradual interfacial contact pressure rise that are conducive to efficient hydrodynamic wedging. Skewed elevated contact pressure zones produced by compression edge effects provide for controlled lubricant movement within the dynamic sealing interface between the seal and the relatively rotatable surface, producing enhanced lubrication and low running torque. | 01-19-2012 |
20140035238 | DYNAMIC BACKUP RING ASSEMBLY - A seal backup ring assembly is provided that eliminates fluid differential pressure acting radially on the backup ring, preventing collapse of the backup ring against a shaft. The backup ring is assembled so that the initial clearance (extrusion gap) between the backup ring and relatively rotating member is not affected by the differential pressure acting across the assembly. This allows for an initially small extrusion gap to be present throughout the differential pressure range. | 02-06-2014 |
20140110904 | Dynamic Lay Down Lip Seal With Bidirectional Pumping Feature - A dynamic lip seal is provided for sealing between a housing and a shaft and with a fluid medium to be sealed on an oil side and air on an air side of the seal. The seal includes a seal lip extending from a seal body and including a shaft contact portion adapted for engagement with the shaft and including a static band and a first set of spiral grooves disposed on an oil side of the static band, and a second set of spiral grooves on an air side of the static band. The first and second sets of spiral grooves are both configured to pump oil toward the static band when the shaft is rotated in a first direction, and the first and second sets of spiral grooves are both configured to pump oil away from the static band when the shaft is rotated in a second direction. | 04-24-2014 |
20140151967 | SEALING LIP AND SEAL - A sealing lip seals a first space from a second space with respect to a liquid medium present in the first space. The sealing lip has abutment surface configured to abut on a sealing surface of a component that is movable relative to the sealing lip along a direction of movement. A groove is defined in the abutment surface and pumps any liquid medium present in the groove towards the first space along the direction of movement. The groove extends completely within the abutment surface and is enclosed by the abutment surface, such that it does not intersect either lateral edge of the sealing lip. | 06-05-2014 |
20140312571 | SEALING ASSEMBLY - A radial-shaft sealing assembly includes a sealing lip disposed on a support ring. A cylindrical portion of the sealing lip that abuts on a rotatable shaft contains an elastomeric material and has a profiling for pumping oil or lubricant back to an oil side of the sealing assembly. The profiling includes first and second annular ridges disposed in parallel, and first and second groups of radially-projecting pumping elements disposed therebetween and distributed around the circumference of the cylindrical portion. Each pumping element extending at an angle (α) to the circumferential direction (U) of the cylindrical portion, but the first group of pumping elements has an opposite orientation to the second group of pumping elements. | 10-23-2014 |
20150115543 | Oil Seal - An oil seal includes a bidirectional thread formed by the combination of a normal thread and a reverse thread and including ship-bottom-shaped threads as the threads, in which sealing performance by the thread can be improved. A normal thread and a reverse thread that exhibit a pumping action on a sealing fluid are provided side by side on the circumference on an atmospheric-side surface of a seal lip sliding portion. The normal thread and an reverse thread are respectively threads in which a parallel thread that begins from a lip tip and a ship-bottom-shaped thread continuous with the parallel thread are integrally continuous. | 04-30-2015 |
20150300497 | SHAFT SEAL DEVICE - A lip-type seal shaft seal device equipped with a lip seal for sealing a rotary member and a stationary member concentrically disposed to the inside and outside in a radial direction, has pumping parts for creating pumping action through relative rotational sliding of the lip seal and the rotary member formed in continuous fashion in the circumferential direction on the outside peripheral surface of the rotary member. The pumping parts are configured of intake pumping parts for acting on a sealed fluid in the intake direction, and discharge pumping parts for acting on the sealed fluid in the discharge direction, respectively arranged independently. A lip of the lip seal extends in the axial direction towards the outside atmosphere side leaving a portion of the pumping parts on the sealed fluid side exposed. | 10-22-2015 |
20160047474 | SHAFT SEAL ASSEMBLY WITH EXCLUSION PUMP DUST LIP - A shaft seal assembly including an elastomeric material molded to an annular metal shell is provided. The elastomeric material includes a lip extending from the annular shell to a lip distal end. The lip includes a first lip section projecting toward a center axis, and a second lip section projecting from the first lip section away from the center axis. A dust band is disposed between the first and second lip sections. The elastomeric material also includes flutes disposed on the second lip section and extending helically around the center axis and radially toward the center axis. The dust band can include vents, in which case one of the flutes extends from one side of each vent. The height of the flutes can increase from the dust band to the flute distal end, such that the flutes and the dust band have an equal interior diameter for engaging the shaft. | 02-18-2016 |
20160076651 | ROTARY HYDRAULIC ACTUATOR SEAL - A sealing assembly includes an elastomer seal having an inner surface and a polymer cap bonded to the inner surface of the elastomer seal and having a dynamic sealing surface. The polymer cap is configured to form a continuous fluid-tight seal against a curved element when pressurized. | 03-17-2016 |
20160116067 | SEALING DEVICE - A sealing device is provided with a seal lip which extends toward a sealing space side, a lip edge and an opposite sealing space side conical surface are formed in an inner peripheral surface of the seal lip, the lip edge being slidably brought into close contact with an outer peripheral surface of a rotating body, and the opposite sealing space side conical surface being larger in diameter from the lip edge toward an external space side, a plurality of screw protrusions are formed in the opposite sealing space side conical surface, the screw protrusions generating a screw pump action toward the lip edge side on the basis of rotation of the rotating body in a fixed direction, and a desired number of dust capture portions are formed in a hem portion of each of the screw protrusions, thereby preventing dusts from being bitten into the lip edge sliding portion. | 04-28-2016 |
20160161002 | SEALING DEVICE - The invention provides a sealing device which can inhibit an external dust in an atmospheric side from intruding into a lip end, thereby inhibiting a sealing fluid leakage by trapped dust. In a sealing device inhibiting leakage of a sealing fluid in an inboard side to an atmospheric side, coming into contact with a shaft by a seal lip end and circumferentially having in an atmospheric side inclined surface of the seal lip with a plurality of screws exerting a pumping action to the sealing fluid, a three-dimensional shape for preventing the dust intrusion is provided between the screws so as to inhibit the external dust intrusion in the atmospheric side toward the lip end. The three-dimensional shape is constructed by a projection or a groove extending in a parallel direction to the lip end. The projection or the groove is connected to the screws longitudinally in both end portions. | 06-09-2016 |
20160252181 | SEALING DEVICE | 09-01-2016 |