초록 ▼

A hydraulic seal for sealing between two hydraulic components (1, 2) that move axially one within the other comprises a first pressure-energized ring seal (3) located between the components so as to respond to hydraulic pressure on an axially directed inner face of the seal, and a second ring seal (

A hydraulic seal for sealing between two hydraulic components (1, 2) that move axially one within the other comprises a first pressure-energized ring seal (3) located between the components so as to respond to hydraulic pressure on an axially directed inner face of the seal, and a second ring seal (7) located adjacent the inner face of the first seal (3) so as to control the flow of hydraulic fluid to the first seal. The second ring seal (7) is located in an annular groove (8) in one of the components (1) with an outer annular face (11) that is directed axially towards the first seal (3) and lies opposite an adjacent side wall (13) of the groove (8) to be supported thereby. A sealing lip (9) protrudes from the groove (8) and has a radially directed annular sealing face (15) to engage in face-to-face contact with the other of the components (2). An annular inner face (14) of the second ring seal is angled within the groove (8) away from an adjacent side wall (13) of the groove and towards the sealing lip (9) so that the sealing lip can flex within the groove (8) away from the first seal (3) to release excess pressure between the first and second seals.

대표청구항 ▼

A hydraulic seal for sealing between two hydraulic components that move axially one within the other, said seal comprising a first pressure-energized ring seal located between the components so as to respond to hydraulic pressure on an axially directed inner face of the seal, and a second ring seal

A hydraulic seal for sealing between two hydraulic components that move axially one within the other, said seal comprising a first pressure-energized ring seal located between the components so as to respond to hydraulic pressure on an axially directed inner face of the seal, and a second ring seal located adjacent said inner face of the first seal so as to control the flow of hydraulic fluid to the first seal, said second ring seal being composed of a resilient material and being located in an annular groove in one of said components so that a sealing lip thereof protrudes radially from the groove and has a radially directed annular sealing face to engage in face-to-face sealing contact with the other of said components, said second ring seal having inner and outer axially directed annular faces that bound said sealing lip and sealing face on opposite sides thereof and cooperate with respective adjacent side walls of the groove, said outer annular face being directed axially toward the first seal and being supported by said respective adjacent side wall of the groove, and said inner annular face comprising means that extends from within the groove to said sealing face and which is angled away from said respective adjacent side wall of the groove toward said sealing face so as to leave a space between said side wall and said inner annular face to accommodate resilient axially flexing of the sealing lip away from the first ring seal to release excess pressure between the first and second seals.