Kabushiki Kaisha Riken

Namsun Park

Yoshiyuki Sato

[Object] To provide a seal ring capable of both reducing a friction loss and reducing oil leakage. [Solving Means] A seal ring includes: an inner circumferential surface; an outer circumferential surface orthogonal to the inner circumferential surface; side surfaces orthogonal to the inner circumferential surface and the outer circumferential surface; and a plurality of pockets provided, spaced apart from one another in one of the side surfaces. The plurality of pockets each have a symmetrical shape in a circumferential direction and are opened on a side of the inner circumferential surface and closed on a side of the outer circumferential surface. The plurality of pockets each include circumferential end portions that are provided in end portions in the circumferential direction and are R-surfaces each having a convex shape connected to the side surface, a bottom portion provided in a central region in the circumferential direction, and inclined portions each extending between each of the circumferential end portions and the bottom portion. The inclined portions each include at least one ridge portion, a first inclined portion extending between the bottom portion and the ridge portion and forming a first angle with respect to the side surface, and a second inclined portion extending between the circumferential end portion and the ridge portion and forming a second angle smaller than the first angle with respect to the side surface.

Seal ring

[Object] To provide a seal ring that realizes excellent sealability irrespective of magnitude of hydraulic pressure. [Solving Means] A seal ring includes an outer surface and side surfaces formed symmetrically about a plane perpendicular to a central axis. The outer surface includes a peak portion, first tapered surfaces, and second tapered surfaces. The peak portion is provided along the plane. A diameter of each of the first tapered surfaces is reduced with increased distance from the peak portion, each of the first tapered surfaces forming a first angle with respect to the central axis. Each of the second tapered surfaces is closer to each of the side surfaces than each of the first tapered surfaces is, a diameter of each of the second tapered surfaces being reduced with increased distance from each of the first tapered surfaces, each of the second tapered surfaces forming a second angle with respect to the central axis, the second angle being larger than the first angle.

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Kashiwazaki, Japan

Namsun Park