JP2019168022A - Cylindrical roller bearing - Google Patents

Abstract

To provide a flange ring for guiding an inner peripheral surface of a cage and both end surfaces in an axial direction of a cylindrical roller, which is arranged in separate from an inner ring member to hold an inner ring track, in which an under-race lubrication is applied by arranging it at a surface opposite the cylindrical roller of the flange ring, even when the dry run state where lubricant supply is stopped, the lubricant can be supplied to a slide surface of the flange ring to improve a high-speed characteristic and a reliability.SOLUTION: A flange ring 7 is formed by porous material, a part of lubricant passing through an oil passing passage 7a of the flange ring 7 is always immersed into the flange ring 7 of porous material by a centrifugal force and held and even when a dry run is carried out where oil feeding to an oil receiver ring 8 is shut off, lubricant oil immersed into the flange ring 7 is supplied directly to contact surfaces of the flange ring 7 and both end faces of a cylindrical roller 5 or a contact surface between the flange ring 7 and an inner peripheral surface of a cage 6 to improve high-speed characteristic and reliability.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cylindrical roller bearing, and more particularly to a cylindrical roller bearing suitable for high-speed rotation.

  As a cylindrical roller bearing suitable for high-speed rotation, such as for an aircraft engine, as shown in FIG. 5, an inner ring member 11 having an inner ring raceway 11a on the outer peripheral surface and externally supporting a shaft 13 that rotates at high speed inside the housing 12; An outer ring member 14 having an outer ring raceway 14a on the inner peripheral surface and fitted and supported in the housing 12, a plurality of cylindrical rollers 15 provided between the inner ring raceway 11a and the outer ring raceway 14a, and a cylindrical roller 15 are provided. Provided separately from the inner ring member 11 so as to sandwich the retainer 16 that is uniformly held in the circumferential direction and the inner ring raceway 11a, and guides the inner circumferential surface of the retainer 16 and both axial end surfaces of the cylindrical roller 15 There is a type that includes a collar ring 17 and an oil receiving ring 18 that is provided on the surface of the collar ring 17 opposite to the cylindrical roller 15 and that has an oil receiving groove 18a on the inner peripheral surface (for example, Patent Documents). 1).

  In the cylindrical roller bearing shown in FIG. 5, an oil passage 17 a is provided between the inner peripheral surface of the collar ring 17 and both side surfaces of the inner ring member 11, and the lubricating oil supplied to the oil receiving ring 18 is supplied to the collar ring 17. Under race lubrication is employed in which the lubricant is supplied to the rolling contact surface via the roller chamfered portion of the cylindrical roller 15 as shown by the arrows.

  Furthermore, in cylindrical roller bearings that require high-speed rotation, there is also a type in which lubricating oil is supplied to the oil receiving ring 18 from a jet nozzle in order to improve underlace lubrication (for example, Patent Document 2).

JP-A-01-58814 JP 11-132244 A

  By the way, in the cylindrical roller bearing introduced in Patent Document 1, the collar ring 17 is made of ceramic, and the contact surface with both end surfaces of the metal cylindrical roller 15 or the guide surface of the inner peripheral surface of the cage 16 is provided. It is described that the sliding characteristics of the contact surface are improved.

  However, even if the collar ring 17 is made of ceramic and the sliding characteristics of the contact surface with both end surfaces of the metal cylindrical roller 15 or the contact surface with the guide surface of the inner peripheral surface of the cage 16 are improved, In a dry run state in which the supply of lubricating oil is delayed, there is a risk that an oil film is not formed on the slip surface of the collar ring 17 and the oil film is cut.

  On the other hand, the cylindrical roller bearing introduced in Patent Document 2 supplies lubricating oil from a jet nozzle, so that the lubrication efficiency is high even at high speed rotation, but still causes oil film breakage during dry run and seizure due to welding on the sliding surface. There is a risk that will occur.

  Therefore, the present invention is provided with a collar ring that is provided separately from the inner ring member so as to sandwich the inner ring raceway, and that guides both the inner peripheral surface of the cage and both axial end surfaces of the cylindrical roller. In cylindrical roller bearings that employ under-race lubrication with an oil receiving ring provided on the opposite side of the roller, supply lubrication oil to the sliding surface of the collar ring even in a dry-run state where the supply of lubrication oil stagnate To improve the speed and reliability.

  In order to solve the above problems, the present invention has an inner ring raceway on the outer peripheral surface, an inner ring member that externally supports a shaft that rotates at high speed inside the housing, and an outer ring raceway on the inner peripheral surface, An outer ring member fitted and supported in a housing, a plurality of cylindrical rollers provided between the inner ring raceway and the outer ring raceway, a cage for holding the plurality of cylindrical rollers equally in the circumferential direction, and the inner ring raceway. A flange ring is provided separately from the inner ring member so as to be sandwiched, and guides the inner circumferential surface of the cage and the axial side surface of the cylindrical roller. A cylindrical roller bearing including a ring is characterized in that the collar ring is formed of a porous body.

  The cage for uniformly arranging the plurality of cylindrical rollers in the circumferential direction is guided by the outer diameter surface of the collar ring.

  The porous body forming the collar ring is preferably formed on an iron-based sintered metal.

  You may make it provide the jet nozzle which supplies lubricating oil toward an oil receiving ring.

  Provided on the cylindrical roller side of the oil receiving ring is an inner surface side extension portion that overlaps the outer diameter surface of the collar ring, and the inner surface side extension portion of the oil receiving wheel is subjected to hoop stress during high-speed rotation, and is porous. The stress applied to the collar ring formed by the above may be relaxed, and an oil filler port penetrating in the radial direction may be provided in the inner surface side extension of the oil receiving ring.

  As described above, in the cylindrical roller bearing according to the present invention, the collar ring is formed of a porous body, and a part of the lubricating oil passing through the oil passage of the collar ring is converted into the collar ring of the porous body by centrifugal force. It is always soaked and held.

  As a result, even during dry running when the oil supply to the oil receiving wheel is shut off, the lubricating oil soaked into the collar ring is the contact surface between the collar ring and both end faces of the cylindrical roller, or the inner circumferential surface of the collar ring and the cage. Since the oil is directly supplied to the contact surface, oil film formation on the contact surface can be maintained.

  Further, in order to suppress the hoop stress acting on the collar ring, an inner surface side extension that overlaps the outer diameter surface of the collar ring is provided on the cylindrical roller side of the oil bearing ring, and the inner surface side extension of the oil bearing ring. Therefore, the stress applied to the collar ring formed by the porous body may be relieved by receiving a hoop stress during high-speed rotation. An oil supply port that penetrates in the radial direction is provided in the extension on the inner surface of the oil receiving wheel, so that the lubricating oil that has soaked into the collar ring is retained from the oil supply port even during a dry run when the oil supply to the oil receiving wheel is blocked. It is directly supplied to the guide surface with the container or the contact surface between the collar ring and both end faces of the cylindrical roller, and the oil film formation on the sliding surface of the collar ring is maintained, further improving the reliability at high speed rotation. .

It is a schematic sectional drawing which shows 1st Embodiment of the cylindrical roller bearing which concerns on this invention. It is a schematic sectional drawing which shows 2nd Embodiment of the cylindrical roller bearing which concerns on this invention. It is a schematic sectional drawing which shows 3rd Embodiment of the cylindrical roller bearing which concerns on this invention. It is a graph which shows the test result which evaluated the time-dependent discharge rate when attaching and rotating the cylindrical-shaped sintered metal which soaked lubricating oil. It is a schematic sectional drawing which shows the conventional cylindrical roller bearing.

  Embodiments of a cylindrical roller bearing according to the present invention will be described below with reference to the accompanying drawings.

  The cylindrical roller bearing of the embodiment shown in FIG. 1 has an inner ring raceway 1a on the outer peripheral surface, an inner ring member 1 that externally supports a shaft 3 that rotates at high speed inside the housing 2, and an outer ring raceway 4a on the inner peripheral surface. And an outer ring member 4 fitted and supported in the housing 2, a plurality of cylindrical rollers 5 provided between the inner ring raceway 1a and the outer ring raceway 4a, and the plurality of cylindrical rollers 5 are equally held in the circumferential direction. A cage 6 that is provided separately from the inner ring member 1 so as to sandwich the inner ring raceway 1a, and a collar 7 that guides the inner circumferential surface of the cage 6 and the side surface in the axial direction of the cylindrical roller 5; An oil receiving ring 8 is provided on the surface of the collar ring 7 opposite to the cylindrical roller 5.

  An oil receiving groove 8 a for holding the supplied lubricating oil is provided on the inner peripheral surface of the oil receiving wheel 8.

  The cylindrical roller bearing shown in FIG. 1 is provided with an oil passage 7 a between the inner peripheral surface of the collar ring 7 and both side surfaces of the inner ring member 1, and the lubricating oil supplied to the oil receiving ring 8 is supplied to the collar ring 7. Under-lace lubrication is employed that draws oil into the oil passage 7a and supplies lubricating oil to the roller chamfered portion of the cylindrical roller 5 as indicated by an arrow.

  In the present invention, the collar ring 7 is formed of a porous body, and a part of the lubricating oil passing through the oil passage 7a of the collar ring 7 always soaks into the collar ring 7 of the porous body by centrifugal force. It is to be retained.

  As a result, even during a dry run in which oil supply to the oil receiving wheel 8 is interrupted, the lubricating oil soaked into the collar ring 7 is retained by the contact surface between the collar ring 7 and both end faces of the cylindrical roller 5 or the collar ring 7. Since it is directly supplied to the contact surface with the inner peripheral surface of the vessel 6, oil film formation on the contact surface can be maintained.

  The cylindrical roller bearing of the embodiment shown in FIG. 2 is similar to the embodiment shown in FIG. 1 in that it employs underlace lubrication. However, in the embodiment shown in FIG. The jet nozzle 9 is used to improve the oil supply efficiency during high-speed operation.

  The cylindrical roller bearing of the embodiment shown in FIG. 3 is particularly used at high speed rotation, and in order to suppress the hoop stress acting on the collar ring 7, on the cylindrical roller 5 side of the oil receiving ring 8, A flange formed by a porous body is provided with an inner surface side extension 8b that overlaps the outer diameter surface of the collar ring 7 and is subjected to hoop stress during high speed rotation by the inner surface side extension 8b of the oil receiving ring 8. The stress applied to the ring 7 is relaxed.

  An oil supply port 8c penetrating in the radial direction is provided on the inner surface side extension 8b of the oil receiving wheel 8, so that the lubricating oil soaked into the collar ring 7 can be obtained even during a dry run in which oil supply to the oil receiving wheel 8 is blocked. The oil supply port 8c is directly supplied to the guide surface with the cage 6 or the contact surface between the collar ring 7 and both end faces of the cylindrical roller 5, so that the oil film formation on the sliding surface of the collar ring 7 is maintained. It has become.

  The outer diameter surface of the inner surface side extension portion 8b of the oil receiving ring 8 is subjected to polishing and subjected to a high temperature tempering process using an M50 material. As a result, the oil film formation rate on the sliding surface between the collar ring 7 and the cage 6 is improved, and there is no material deterioration due to heat generation on the sliding surface, and the function of the guiding surface of the cage 6 is achieved.

  As the porous body forming the collar ring 7 in the above embodiment, it is preferable to use a sintered metal. Sintered metal can supply the soaked lubricating oil without problems even at high speed operation.

  In order to confirm that the lubricating oil soaked in the sintered metal even during high-speed operation can be supplied without problems, a cylindrical sintered metal soaked with the lubricating oil is attached to the tip of the spindle spindle and rotated. FIG. 4 shows the test results for evaluating the “ejection rate” with time.

  The vertical axis in FIG. 4 indicates the ratio of the discharge amount to the oil content at the initial stage of the test, and shows a state where 100% is obtained when all the oil in the sintered metal is discharged. It shows a state where no oil is discharged. In the test results shown in FIG. 4, it was confirmed that the sintered metal retained oil for several tens of minutes and continued to be supplied.

  The porous body used for the collar ring 7 is preferably an iron-based sintered metal. Thereby, since a linear expansion coefficient becomes equivalent to peripheral parts, such as the inner ring member 1, the cylindrical roller 5, and the holder | retainer 6, the influence of the dimensional change at the time of a temperature change can be relieved.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

1: Inner ring member 1a: Inner ring raceway 2: Housing 3: Shaft 4: Outer ring member 4a: Outer ring raceway 5: Cylindrical roller 6: Cage 7: Collar ring 7a: Oil passage 8: Oil receiving ring 8a: Oil receiving groove 8b : Inner side extension 8c: Refueling port 9: Jet nozzle

Claims (5)

  An inner ring member having an inner ring raceway on the outer peripheral surface and externally supporting a shaft that rotates at high speed inside the housing; an outer ring member having an outer ring raceway on the inner peripheral surface and supported by the housing; and the inner ring A plurality of cylindrical rollers provided between the raceway and the outer ring raceway, a cage that holds the plurality of cylindrical rollers equally in the circumferential direction, and the inner ring member are provided separately from the inner ring raceway, In a cylindrical roller bearing comprising a collar that guides the inner circumferential surface of the cage and the axial side surface of the cylindrical roller, and an oil receiving ring that is provided on the surface opposite to the cylindrical roller of the collar, the collar is A cylindrical roller bearing formed of a porous body.   The cylindrical roller bearing according to claim 1, wherein a cage that uniformly arranges the plurality of cylindrical rollers in the circumferential direction is guided by an outer diameter surface of the collar ring.   3. The cylindrical roller bearing according to claim 1, wherein the porous body forming the collar ring is made of an iron-based sintered metal.   The cylindrical roller bearing according to any one of claims 1 to 3, further comprising a jet nozzle that supplies lubricating oil toward the oil receiving ring.   Provided on the cylindrical roller side of the oil receiving ring is an inner surface side extension portion that overlaps the outer diameter surface of the collar ring, and the inner surface side extension portion of the oil receiving wheel is subjected to hoop stress during high-speed rotation, and is porous. The oil applied to the inner ring side extension of the oil receiving ring is provided with a filler port penetrating in the radial direction so as to relieve stress applied to the collar ring formed by the outer ring. Cylindrical roller bearing.

Images