Rolling bearings

Abstract

To provide a rolling bearing which can limit an amount of an oil to be supplied to the interior of a rolling bearing under high speed rotation.SOLUTION: A rolling bearing includes: an outer ring 11 having an outer ring raceway surface 11a on an inner peripheral surface; an inner ring 12 having an inner ring raceway surface 12a on an outer peripheral surface; and rolling elements 13 which are provided between the outer ring raceway surface 11a and the inner ring raceway surface 12a in a rollable manner and is supplied with a lubrication oil from a shaft member 20 having multiple shaft oil holes 22 penetrating through the shaft member 20 in a radial direction, and a shaft oil groove 23 formed along an outer peripheral surface and communicating with the multiple shaft oil holes 22. The rolling bearing further includes a ring member 30 having multiple ring member oil holes 30b penetrating through the ring member 30 in the radial direction, and a ring member oil groove 33 formed along an outer peripheral surface and communicating with the multiple ring member oil holes 30b, the ring member 30 fitted between the shaft member 20 and the inner ring 12. In the inner ring 12, multiple inner ring oil holes 12b communicating with the ring member oil groove 33 of the ring member 30 are formed from an inner peripheral surface to an outer peripheral surface of the inner ring 12.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rolling bearing, and more particularly to an under-race lubrication type rolling bearing used under high speed rotation in, for example, jet engines, gas turbines, turbo chillers, and the like. [Background technology]

[0002] Conventionally, as a rolling bearing used at high speeds, there has been known an under-race lubrication type rolling bearing in which an oil hole is provided from the inner surface of the inner ring toward the inner ring raceway surface to reliably supply lubricating oil to the inside of the bearing (see, for example, Patent Document 1), and the oil hole is composed of a hole or a notch.

[0003] In addition, the purpose of the oil holes is to cool the bearing, and it is also known that the oil holes are formed with an inclination in the axial direction relative to the radial direction in order to extend the distance that the oil holes pass through the inside of the inner ring (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-009515 A [Patent Document 2] JP 2010-156367 A Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional rolling bearings, the centrifugal force caused by rotation increases when the bearing is rotated at high speeds, causing excess oil to be supplied to the inside of the rolling bearing, resulting in a problem of temperature rise in the rolling bearing due to the resistance of the oil to agitation.

[0006] Efforts had been made to limit the amount of oil supplied to the inside of the bearing, such as reducing the diameter of the oil hole, but this tended to increase costs due to problems with processability.

[0007] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a rolling bearing that is capable of limiting the amount of oil supplied to the inside of the rolling bearing even under high-speed rotation. [Means for solving the problem]

[0008] The above object of the present invention can be achieved by the following configuration. (1) A bearing comprising an outer ring having an outer ring raceway surface on an inner peripheral surface thereof, an inner ring having an inner ring raceway surface on an outer peripheral surface thereof, and a plurality of rolling elements provided so as to be capable of rolling between the outer ring raceway surface and the inner ring raceway surface, A rolling bearing to which lubricant is supplied from a shaft member having a plurality of shaft oil holes penetrating in a radial direction and a shaft oil groove formed along an outer peripheral surface and communicating with the plurality of shaft oil holes, a ring member having a plurality of ring member oil holes penetrating in a radial direction and a ring member oil groove formed along an outer peripheral surface and communicating with the plurality of ring member oil holes, the ring member being fitted between the shaft member and the inner ring; a plurality of inner ring oil holes communicating with the ring member oil groove of the ring member are formed in the inner ring from the inner peripheral surface toward the outer peripheral surface of the inner ring; Rolling bearing. (2) The inner ring oil holes and the ring member oil holes are each formed at approximately equal intervals in the circumferential direction, the numbers of the plurality of inner ring oil holes and the plurality of ring member oil holes are set so that, when the ring member is fitted into the inner ring such that any one of the plurality of inner ring oil holes and any one of the plurality of ring member oil holes are in the same phase, the remaining plurality of inner ring oil holes and the remaining plurality of ring member oil holes are all in different phases. A rolling bearing as described in (1). (3) The plurality of shaft oil holes and the plurality of ring member oil holes are formed at approximately equal intervals in the circumferential direction, the numbers of the plurality of shaft oil holes and the plurality of ring member oil holes are set so that, when the ring member is fitted onto the shaft member such that any one of the plurality of shaft oil holes and any one of the plurality of ring member oil holes are in the same phase, the remaining plurality of shaft oil holes and the remaining plurality of ring member oil holes are all in different phases. A rolling bearing according to (1) or (2). Effect of the Invention

[0009] According to the present invention, the presence of the ring member makes it possible to limit the amount of oil supplied to the inside of the rolling bearing, even under high speed rotation, and to suppress a rise in temperature of the rolling bearing. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view illustrating an embodiment of a rolling bearing according to the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line A-A in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a rolling bearing according to the present invention will be described in detail with reference to the drawings.

[0012] 1, the ball bearing (rolling bearing) 10 of this embodiment is a three-point contact ball bearing, and includes an outer ring 11 having an outer ring raceway surface 11a on its inner peripheral surface, an inner ring 12 having an inner ring raceway surface 12a on its outer peripheral surface, and a plurality of balls (rolling elements) 13 provided so as to roll between the outer ring raceway surface 11a and the inner ring raceway surface 12a. The ball bearing 10 may include a cage.

[0013] 1 and 2, the shaft member 20 is a cylindrical member having a plurality of (six in this embodiment) shaft oil holes 22 that penetrate radially and communicate with an internal oil passage 21, and a shaft oil groove 23 that is formed along the outer circumferential surface and communicates with the plurality of shaft oil holes 22. The six shaft oil holes 22 are formed at approximately equal intervals in the circumferential direction.

[0014] Furthermore, the ball bearing 10 of this embodiment is provided with a ring member 30 made of metal or the like and fitted between the shaft member 20 and the inner ring 12. The ring member 30 is a ring-shaped member that is fitted onto the outside of the shaft member 20 and also fitted onto the inner peripheral surface of the inner ring 12. The ring member 30 has a plurality of (five in this embodiment) ring member oil holes 30b that penetrate in the radial direction, and ring member oil grooves 33 that are formed along the outer peripheral surface and communicate with the plurality of ring member oil holes 30b.

[0015] Furthermore, the inner ring 12 has a plurality of inner ring oil holes 12b (eight in this embodiment) that communicate with the ring member oil groove 33 of the ring member 30, formed from the inner peripheral surface of the inner ring 12 toward the inner ring raceway surface 12a on the outer peripheral surface. The eight inner ring oil holes 12b are formed at approximately equal intervals in the circumferential direction.

[0016] In a ball bearing 10 configured in this manner, lubricating oil is supplied to the oil passage 21 of the shaft member 20, and thereby the lubricating oil is supplied to the inside of the bearing via the shaft oil hole 22 and shaft oil groove 23 of the shaft member 20, the ring member oil hole 30b and ring member oil groove 33 of the ring member 30, and the inner ring oil hole 12b of the inner ring 12.

[0017] As described above, the ball bearing 10 of this embodiment is provided with the ring member 30 that is fitted between the shaft member 20 and the inner ring 12. The ring member 30 has a plurality of ring member oil holes 30b that penetrate in the radial direction, and ring member oil grooves 33 that are formed along the outer circumferential surface and communicate with the plurality of ring member oil holes 30b.

[0018] Lubricating oil is supplied to oil passage 21 of shaft member 20 and supplied through shaft oil hole 22 and shaft oil groove 23, passes through ring member oil hole 30b and ring member oil groove 33 of ring member 30, and then moves to inner ring 12. As a result, the presence of ring member 30 increases the flow path resistance of lubricating oil passing from shaft member 20 to the inside of ball bearing 10. For this reason, even when shaft member 20 rotates at high speed, the amount of oil supplied to the inside of ball bearing 10 can be limited, preventing excessive oil from being supplied to the inside, and ultimately preventing a rise in temperature of ball bearing 10 due to oil agitation resistance.

[0019] In addition, the multiple inner ring oil holes 12b and the multiple ring member oil holes 30b are formed at approximately equal intervals in the circumferential direction, and the number of the multiple inner ring oil holes 12b and the multiple ring member oil holes 30b is set so that when the ring member 30 is fitted into the inner ring 12 so that any one of the multiple inner ring oil holes 12b and any one of the multiple ring member oil holes 30b are in the same phase, the remaining multiple inner ring oil holes 12b and the remaining multiple ring member oil holes 30b are all in different phases. This makes it possible to limit the maximum number of oil holes in the ring member 30 and the inner ring 12 that are in the same phase to one. Therefore, depending on the combination conditions of these components, it is possible to prevent a situation in which excessive lubricating oil is supplied to the ball bearing 10.

[0020] Furthermore, the multiple shaft oil holes 22 and the multiple ring member oil holes 30b are formed at approximately equal intervals in the circumferential direction, and the numbers of the multiple shaft oil holes 22 and the multiple ring member oil holes 30b are set so that when the ring member 30 is fitted onto the shaft member 20 so that any one of the multiple shaft oil holes 22 and any one of the multiple ring member oil holes 30b are in phase with each other, the remaining multiple shaft oil holes 22 and the remaining multiple ring member oil holes 30b are all in different phases. This makes it possible to limit the maximum number of shaft member 20 and ring member 30 oil holes in the same phase to one. Therefore, depending on the combination conditions of these members, it is possible to prevent a situation in which excessive lubricating oil is supplied to the ball bearing 10. Therefore, the numbers of the inner ring oil holes 12b, the ring member oil holes 30b, and the shaft oil holes 22 are not limited to those in this embodiment, so long as the above conditions are satisfied.

[0021] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the gist of the present invention. For example, in this embodiment, the present invention is illustrated as being applied to a three-point contact ball bearing, but this is not limited to this, and the present invention may also be applied to other types of rolling bearings, such as deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, and tapered roller bearings. [Explanation of symbols]

[0022] 10 Ball bearings (rolling bearings) 11 Outer ring 11a Outer ring raceway 12 Inner Circle 12a Inner ring raceway surface 12b Inner ring oil hole 13 Ball (rolling element) 20 Shaft member 21 Oil road 22 Shaft oil hole 23 Shaft oil groove 30 Ring member 30b Ring component oil hole 33 Ring member oil groove

Claims

1. A bearing comprising an outer ring having an outer ring raceway surface on its inner peripheral surface, an inner ring having an inner ring raceway surface on its outer peripheral surface, and a plurality of rolling elements provided so as to be able to roll freely between the outer ring raceway surface and the inner ring raceway surface, A rolling bearing to which lubricant is supplied from a shaft member having a plurality of shaft oil holes penetrating in a radial direction and a shaft oil groove formed along an outer peripheral surface and communicating with the plurality of shaft oil holes, a ring member having a plurality of ring member oil holes penetrating in a radial direction and a ring member oil groove formed along an outer peripheral surface and communicating with the plurality of ring member oil holes, the ring member being fitted between the shaft member and the inner ring; a plurality of inner ring oil holes communicating with the ring member oil groove of the ring member are formed in the inner ring from an inner peripheral surface toward an outer peripheral surface of the inner ring, the plurality of inner ring oil holes and the plurality of ring member oil holes are formed at approximately equal intervals in a circumferential direction, the numbers of the plurality of inner ring oil holes and the plurality of ring member oil holes are set so that, when the ring member is fitted into the inner ring such that any one of the plurality of inner ring oil holes and any one of the plurality of ring member oil holes are in the same phase, the remaining plurality of inner ring oil holes and the remaining plurality of ring member oil holes are all in different phases. Rolling bearing.

2. An outer ring having an outer ring raceway surface on its inner circumferential surface, an inner ring having an inner ring raceway surface on its outer circumferential surface, and a plurality of rolling elements provided between the outer ring raceway surface and the inner ring raceway surface so as to be able to roll freely; A rolling bearing to which lubricant is supplied from a shaft member having a plurality of shaft oil holes penetrating in a radial direction and a shaft oil groove formed along an outer peripheral surface and communicating with the plurality of shaft oil holes, a ring member having a plurality of ring member oil holes penetrating in a radial direction and a ring member oil groove formed along an outer peripheral surface and communicating with the plurality of ring member oil holes, the ring member being fitted between the shaft member and the inner ring; a plurality of inner ring oil holes communicating with the ring member oil groove of the ring member are formed in the inner ring from an inner peripheral surface toward an outer peripheral surface of the inner ring, the plurality of shaft oil holes and the plurality of ring member oil holes are formed at approximately equal intervals in a circumferential direction, the numbers of the plurality of shaft oil holes and the plurality of ring member oil holes are set so that, when the ring member is fitted onto the shaft member such that any one of the plurality of shaft oil holes and any one of the plurality of ring member oil holes are in the same phase, the remaining plurality of shaft oil holes and the remaining plurality of ring member oil holes are all in different phases. Rolling bearing.

3. An outer ring having an outer ring raceway surface on its inner circumferential surface, an inner ring having an inner ring raceway surface on its outer circumferential surface, and a plurality of rolling elements provided between the outer ring raceway surface and the inner ring raceway surface so as to be able to roll freely; A rolling bearing to which lubricant is supplied from a shaft member having a plurality of shaft oil holes penetrating in a radial direction and a shaft oil groove formed along an outer peripheral surface and communicating with the plurality of shaft oil holes, a ring member having a plurality of ring member oil holes penetrating in a radial direction and a ring member oil groove formed along an outer peripheral surface and communicating with the plurality of ring member oil holes, the ring member being fitted between the shaft member and the inner ring; a plurality of inner ring oil holes communicating with the ring member oil groove of the ring member are formed in the inner ring from an inner peripheral surface toward an outer peripheral surface of the inner ring, the plurality of inner ring oil holes and the plurality of ring member oil holes are formed at approximately equal intervals in a circumferential direction, the numbers of the plurality of inner ring oil holes and the plurality of ring member oil holes are set so that, when the ring member is fitted into the inner ring such that any one of the plurality of inner ring oil holes and any one of the plurality of ring member oil holes are in the same phase, the remaining plurality of inner ring oil holes and the remaining plurality of ring member oil holes are all in different phases, the plurality of shaft oil holes and the plurality of ring member oil holes are formed at approximately equal intervals in a circumferential direction, the numbers of the plurality of shaft oil holes and the plurality of ring member oil holes are set so that, when the ring member is fitted onto the shaft member such that any one of the plurality of shaft oil holes and any one of the plurality of ring member oil holes are in the same phase, the remaining plurality of shaft oil holes and the remaining plurality of ring member oil holes are all in different phases. Rolling bearing.

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