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US 2019/0170187 A1Published application
Ball bearing, spindle device, and machine tool
AssigneeNsk Ltd.
InventorsKyohei MATSUNAGA, Yoshiaki KATSUNO
Life of this patent
Estimating the term…
Abstract
In an angular contact ball bearing (10), an outer ring (12) has at least one radial hole (15) passing through in the radial direction from the outer peripheral surface to the inner peripheral surface of the outer ring (12), and the axial-direction position of an inner-diameter-side opening part of the radial hole (15) is located between the groove bottom of the outer ring (12) and the point of contact between a ball (13) and the outer ring (12), as well as being separated from a contact ellipse between the ball (13) and an outer ring track groove (12a)
Claims13
A ball bearing comprising:
- an inner ring having an inner ring raceway groove formed in an outer peripheral surface;
- an outer ring having an outer ring raceway groove formed in an inner peripheral surface, a counterbore formed at one axial side of the outer ring raceway groove, and a groove shoulder formed at the other axial side of the outer ring raceway groove;
- and
- a plurality of balls arranged rollably between the inner ring raceway groove and the outer ring raceway groove,
- wherein the ball bearing is lubricated by lubricating oil,
- wherein the outer ring has at least one radial hole penetrating from an outer peripheral surface thereof to the inner peripheral surface thereof in a radial direction, and
- wherein an axial position of an inner diameter-side opening of the radial hole is located between a groove bottom of the outer ring and a contact point of the ball and the outer ring and is spaced from a contact ellipse between the ball and the outer ring raceway groove.
4 more elements
A ball bearing comprising:
- an inner ring having an inner ring raceway groove formed in an outer peripheral surface;
- an outer ring having an outer ring raceway groove formed in an inner peripheral surface, a counterbore formed at one axial side of the outer ring raceway groove, and a groove shoulder formed at the other axial side of the outer ring raceway groove;
- and
- a plurality of balls arranged rollably between the inner ring raceway groove and the outer ring raceway groove,
- wherein the ball bearing is lubricated by lubricating oil,
- wherein the outer ring has at least one radial hole penetrating from an outer peripheral surface thereof to the inner peripheral surface thereof in a radial direction, and
- wherein an axial position of an inner diameter-side opening of the radial hole is located in the outer ring raceway groove at an opposite side to a groove bottom of the outer ring with respect to a contact point of the ball and the outer ring and is spaced from a contact ellipse between the ball and the outer ring raceway groove.
4 more elements
A ball bearing comprising:
- an inner ring having an inner ring raceway groove formed in an outer peripheral surface;
- an outer ring having an outer ring raceway groove formed in an inner peripheral surface, a counterbore formed at one axial side of the outer ring raceway groove, and a groove shoulder formed at the other axial side of the outer ring raceway groove;
- and
- a plurality of balls arranged rollably between the inner ring raceway groove and the outer ring raceway groove,
- wherein the ball bearing is lubricated by lubricating oil,
- wherein the outer ring has at least one radial hole penetrating from an outer peripheral surface thereof to the inner peripheral surface thereof in a radial direction, and
- wherein an axial position of an inner diameter-side opening of the radial hole is spaced from a contact ellipse between the ball and the outer ring raceway groove and is provided over the outer ring raceway groove and the groove shoulder at an opposite side to a groove bottom of the outer ring with respect to a contact point of the ball and the outer ring.
4 more elements
A ball bearing comprising:
- an inner ring having an inner ring raceway groove formed in an outer peripheral surface;
- an outer ring having an outer ring raceway groove formed in an inner peripheral surface, a counterbore formed at one axial side of the outer ring raceway groove, and a groove shoulder formed at the other axial side of the outer ring raceway groove;
- and
- a plurality of balls arranged rollably between the inner ring raceway groove and the outer ring raceway groove,
- wherein the ball bearing is lubricated by lubricating oil,
- wherein the outer ring has at least one radial hole penetrating from an outer peripheral surface thereof to the inner peripheral surface thereof in a radial direction,
- wherein an axial position of an inner diameter-side opening of the radial hole is provided in the groove shoulder, and
- wherein at least a part of the inner diameter-side opening of the radial hole axially overlaps the ball.
5 more elements
Dependencies are inferred from the claim text.