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US 2026/0235162 A1Published application
Rolling bearing and bearing device
AssigneeNtn Corporation
InventorsHayato KAWAGUCHI, Yasuhito FUJIKAKE, Shintaro TANAKA
Life of this patent
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Abstract
A rolling bearing is provided in which an outer ring has, on its outer periphery, a fitting surface fitted to a housing as a fixed member, and a relief surface separating the fitting surface over the entire width of the fitting surface, and opposed to the inner peripheral surface of the housing with a radial gap larger than the radial gap between the fitting surface and the inner peripheral surface. The relief surface is machined to have a roughness of Ra 5.0 μm or less.
Claims20
A rolling bearing comprising:
- an outer ring;
- an inner ring;
- and
- a plurality of rolling elements rollably disposed between the outer ring and the inner ring,
- wherein the rolling bearing rotatably supports a rotary shaft to which the inner ring is attached, with the outer ring fitted to a cylindrical inner peripheral surface of an external fixed member with a clearance fit,
- wherein the outer ring has, on an outer periphery of the outer ring,
- a cylindrical fitting surface extending circumferentially, and
- at least one relief surface separating the fitting surface over an entire width of the fitting surface, and opposed to the inner peripheral surface of the fixed member with a radial gap larger than a radial gap between the fitting surface and the inner peripheral surface,
- wherein the at least relief surface of the outer ring is machined to have a roughness of Ra 5.0 μm or less.
6 more elements
A bearing device comprising:
- a fixed member having a cylindrical inner peripheral surface;
- and
- a rolling bearing disposed on an inner peripheral side of the fixed member,
- wherein the rolling bearing comprises:
- an outer ring;
- an inner ring;
- and
- a plurality of rolling elements rollably disposed between the outer ring and the inner ring at regular intervals in a circumferential direction, and
- wherein the rolling bearing rotatably supports a rotary shaft to which the inner ring is attached, with the outer ring fitted to the inner peripheral surface of the fixed member with a clearance fit,
- wherein the fixed member is formed of a light metal;
- wherein the outer ring of the rolling bearing has, on an outer periphery of the outer ring,
- a cylindrical fitting surface extending circumferentially, and
- a relief surface separating the fitting surface over an entire width of the fitting surface, and opposed to the inner peripheral surface of the fixed member with a radial gap larger than a radial gap between the fitting surface and the inner peripheral surface, and
- wherein 0.7θ≤α≤θ is satisfied, where α is an angle around a center of the outer ring, the angle corresponding to a circumferential length of the relief surface of the outer ring, and θ is a pitch angle between each adjacent pair of the rolling elements.
11 more elements
Dependencies are inferred from the claim text.