JP2008008405A - Cylindrical roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical roller bearing for a high speed rotating shaft, actualizing compact design without restricting the design of the rotating shaft while securing the circularity of the raceway surface of an inner ring. <P>SOLUTION: The inner ring 1 is axially three-divided into a center member 1a on which the raceway surface 3 is provided, and two end members 1b on which collars 7 are provided. On the axial outside of the collar 7 of each end member 1b, a scoop 8 is provided for receiving lubricating oil injected from the axially outward direction. An annular oil reservoir portion 9 is provided on the side of the collar 7. The scoop 8 is communicated with the oil reservoir portion 9 via an axial oil hole 10, and the oil reservoir portion 9 is communicated with the inside of the bearing via a radial oil hole 11 and an oil groove 12 so that the lubricating oil received by the scoop 8 is supplied to the inside of the bearing. This actualizes compact design without restricting the design of the rotating shaft 21 while securing the circularity of the raceway surface 3 of the inner ring 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cylindrical roller bearing that supports a rotating shaft that rotates at a high speed.

  Cylindrical roller bearings that support rotating shafts that rotate at high speed, such as gas turbine shafts of aircraft and power generation equipment, and main shafts of machine tools, are provided with flanges on both sides of the raceway surface of the inner ring. An inner ring guide type that guides the cage is often used, and the inside of the bearing is often lubricated by lubricating oil injected from the outside in the axial direction of the bearing.

  In this type of cylindrical roller bearing, the inner ring flange and the cage guided by the outer diameter surface block the lubricating oil injected from the outside in the axial direction, so that it is difficult to supply the lubricating oil inside the bearing. In particular, lubrication tends to be insufficient on the inner ring side including the sliding contact portion between the roller end face and the flange. In order to solve such a lack of lubrication, separate scoop members provided with scoops for receiving the lubricating oil injected from the outside in the axial direction are arranged on both sides of the inner ring, and the lubricating oil received in the scoops is scooped. Through an oil passage provided between the member and the rotating shaft, an axial oil groove provided on the inner diameter surface of the inner ring, and a radial oil hole communicating from the oil groove to the raceway surface of the inner ring or the end of the raceway surface A cylindrical roller bearing for supplying the inside of the bearing has been proposed (see, for example, Patent Document 1). In the device described in Patent Document 1, a step portion is provided on the rotating shaft, and a scoop that opens outward in the axial direction is formed between the step portion and the scoop member.

JP-A-8-4775

  The cylindrical roller bearing for a high-speed rotation shaft described in Patent Document 1 is provided with separate scoop members on both sides of the inner ring, which increases the axial length and hinders compact design. There is a problem. In addition, since the step portion is provided on the rotating shaft and the scoop is formed between the rotating member and the scoop member, there is a problem that the design of the rotating shaft is restricted. Further, since the axial oil groove is provided on the inner diameter surface of the inner ring, the roundness of the raceway surface of the inner ring may be lost when the inner ring is tightly fitted to the rotating shaft.

  Accordingly, an object of the present invention is to provide a cylindrical roller bearing for a high-speed rotating shaft that can be designed compactly without restricting the design of the rotating shaft and can also ensure the roundness of the raceway surface of the inner ring.

  In order to solve the above-mentioned problems, the present invention is arranged such that a plurality of cylindrical rollers are held and arranged between a raceway surface of an inner ring that is externally fitted to a rotating shaft and an outer ring that is fixed to a housing. In the cylindrical roller bearing guided by the outer diameter surface of the flange provided on both sides of the raceway surface of the inner ring, the inner ring is connected to the central member provided with the raceway surface and the two ends provided with the flange. The member is divided into three parts in the axial direction, the central member and the end member are butted in the axial direction at the divided end surface, and the end member is provided with a scoop that receives the lubricant sprayed from the outside in the axial direction. A configuration was adopted in which lubricating oil received in the scoop was supplied into the bearing.

  That is, the inner ring is divided into three in the axial direction, a central member provided with a raceway surface and two end members provided with flanges, and these central members and end members are butted in the axial direction at the divided end surfaces. The end member is provided with a scoop that receives the lubricating oil injected from the outside in the axial direction, and the lubricating oil received by the scoop is supplied into the bearing, so that the design of the rotating shaft can be made compact without any restrictions. It can be designed and the roundness of the raceway surface of the inner ring can be secured.

  The scoop of the end member is provided on the outer side in the axial direction of the scissors, and an annular oil sump portion communicating with the scoop is provided on the scissor side, and the lubricating oil received by the scoop via the oil sump portion is provided inside the bearing. By supplying to, lubricating oil can be stored in the oil reservoir, and sufficient lubricating oil can be supplied into the bearing.

  By providing oil holes that communicate the scoop and the oil reservoir in the axial direction at a plurality of locations in the circumferential direction, and by communicating the oil reservoir with the scoop, the annular oil reservoir is evenly lubricated in the circumferential direction. Oil can be stored.

  Lubricants received by the scoop are provided on the outer diameter side of the scoop by rotating centrifugal force by providing an inward ridge at the entrance of the scoop and communicating the oil hole with the oil reservoir on the outer diameter side of the scoop. The accumulated lubricating oil can be efficiently fed to the oil reservoir.

  Lubricating oil is evenly supplied to the inside of the bearing in the circumferential direction by providing oil holes that communicate in the radial direction from the oil reservoir to the outer diameter surface of the rod that guides the cage. be able to.

  The oil sump portion is opened at the divided end surface of the end member, and oil grooves communicating in the radial direction from the opening of the oil sump portion to the raceway surface of the central member are also provided at a plurality of locations in the circumferential direction. Lubricating oil can be supplied evenly in the circumferential direction into the bearing.

  In the cylindrical roller bearing of the present invention, the inner ring is divided into three in the axial direction into a central member provided with a raceway surface and two end members provided with flanges, and the central member and the end member are divided. The end face is abutted in the axial direction, and the end member is provided with a scoop for receiving the lubricant injected from the outside in the axial direction, and the lubricant received in the scoop is supplied into the bearing. It can be designed compactly without restricting the design, and the roundness of the raceway surface of the inner ring can be secured.

  The scoop of the end member is provided on the outer side in the axial direction of the heel, an annular oil sump portion communicating with the scoop is provided on the heel side, and lubricating oil received by the scoop is supplied into the bearing through the oil sump portion. Thus, the lubricating oil can be stored in the oil reservoir, and sufficient lubricating oil can be supplied into the bearing.

  Lubricating oil is provided evenly in the circumferential direction in the circumferential direction by providing oil holes that communicate the scoop and the oil sump in the axial direction at a plurality of locations in the circumferential direction and by connecting the oil sump with the scoop. Can be stored.

  By providing an inward ridge at the entrance of the scoop and connecting the oil hole to the oil reservoir on the outer diameter side of the scoop, the lubricating oil received in the scoop is moved to the outer diameter side of the scoop by the centrifugal force of rotation. The reservoir and the accumulated lubricating oil can be efficiently fed into the oil reservoir.

  Lubricating oil is evenly supplied to the inside of the bearing in the circumferential direction by providing oil holes that communicate in the radial direction from the oil reservoir to the outer diameter surface of the cage that guides the cage. Can do.

  It is also possible to open the oil sump portion at the divided end surface of the end member and provide oil grooves that communicate in the radial direction from the opening of the oil sump portion to the raceway surface of the central member at a plurality of locations in the circumferential direction. Lubricating oil can be supplied evenly in the direction of the bearing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this cylindrical roller bearing has a plurality of cylinders between a raceway surface 3 and 4 of an inner ring 1 that is externally fitted to a rotating shaft 21 that rotates at a high speed and an outer ring 2 that is fixed to a housing (not shown). Rollers 5 are held and arranged in a cage 6, and the cage 6 is guided by outer diameter surfaces of flanges 7 provided on both sides of the raceway surface 3 of the inner ring 1. The central member 1a provided with the surface 3 and the two end members 1b provided with the flange 7 are divided into three in the axial direction, and the central member 1a and the end member 1b are abutted in the axial direction at the divided end surfaces. Thus, the axial direction is fixed by a sleeve 22 fitted on the rotary shaft 21.

  As shown in FIGS. 1 and 2, a scoop 8 for receiving lubricating oil sprayed from the axially outward nozzle 23 is provided on the axially outer side of the flange 7 of each end member 1b. An annular oil sump 9 that opens to the divided end face is provided, and the scoop 8 and the oil sump 9 are communicated with each other by an axial oil hole 10 that is provided in the circumferential direction. An inward flange 8 a is provided at the entrance of the scoop 8, and each oil hole 10 communicates with the oil reservoir 9 on the outer diameter side of the scoop 8. Therefore, the lubricating oil received in the scoop 8 is accumulated on the outer diameter side of the scoop 8 by the centrifugal force accompanying the rotation of the rotating shaft 21, and the accumulated lubricating oil is efficiently and evenly circular in the circumferential direction. It is sent to the oil sump part 9.

  Further, each end member 1b has a radial oil hole 11 communicating with the oil reservoir 9 and the outer diameter surface of the flange 7, and from the opening of the divided end surface of the oil reservoir 9 to the raceway surface 3 of the central member 1a. Oil grooves 12 communicating in the radial direction are provided equally in the circumferential direction. Therefore, the lubricating oil stored in the oil reservoir 9 is evenly supplied into the bearing in the circumferential direction.

A longitudinal sectional view showing an embodiment of a cylindrical roller bearing Sectional view along the line II-II in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Center member 1b End member 2 Outer ring 3, 4 Raceway 5 Cylindrical roller 6 Cage 7 鍔 8 Scoop 8a 鍔 9 Oil reservoir 10, 11 Oil hole 12 Oil groove 21 Rotating shaft 22 Sleeve 23 Nozzle

Claims (6)

  A plurality of cylindrical rollers are held and arranged in a cage between the raceway surface of the inner ring fitted on the rotation shaft and the outer ring fixed to the housing, and the cage is provided on both sides of the raceway surface of the inner ring. In the cylindrical roller bearing guided by the outer diameter surface, the inner ring is divided into three in the axial direction into a central member provided with the raceway surface and two end members provided with the flanges, The center member and the end member are axially abutted at the split end surface, and a scoop for receiving the lubricant injected from the outside in the axial direction is provided on the end member, and the lubricant received in the scoop is supplied into the bearing. Cylindrical roller bearing characterized by being made to do.   The scoop of the end member is provided on the outer side in the axial direction of the scissors, and an annular oil sump portion communicating with the scoop is provided on the scissor side, and the lubricating oil received by the scoop via the oil sump portion is provided inside the bearing. The cylindrical roller bearing according to claim 1, wherein the cylindrical roller bearing is supplied to the cylinder.   The cylindrical roller bearing according to claim 2, wherein oil holes for communicating the scoop and the oil reservoir in the axial direction are provided at a plurality of locations in the circumferential direction, and the oil reservoir is communicated with the scoop.   The cylindrical roller bearing according to claim 3, wherein an inward flange is provided at an inlet of the scoop, and the oil hole communicates with the oil reservoir on the outer diameter side of the scoop.   The cylindrical roller bearing according to any one of claims 2 to 4, wherein oil holes communicating in a radial direction from the oil sump portion to an outer diameter surface of a flange that guides the cage are provided at a plurality of locations in a circumferential direction.   3. The oil sump portion is opened at a divided end surface of the end member, and oil grooves that communicate in a radial direction from the opening of the oil sump portion to the raceway surface of the central member are provided at a plurality of locations in the circumferential direction. The cylindrical roller bearing in any one of thru | or 5.

Images