JP2016098980A - Lubrication structure of rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing suppressed in occurrence of seizure of the bearing regardless of an ambient temperature of the bearing by suppressing increase and decrease of an internal clearance of the bearing due to change of a bearing ambient temperature.SOLUTION: In a lubrication structure of a rolling bearing including a rolling bearing having an inner ring including a rolling face on an outer peripheral face, an outer ring including a rolling face on an inner peripheral face and further including a pair of flange portions on both ends of the rolling face, and a plurality of rolling elements for making the outer ring and the inner ring relatively rotatable between the inner ring and the outer ring, and a nozzle for discharging a lubricant toward the rolling bearing, a relief groove is formed between the rolling face of the outer ring and the flange portions, and a discharge hole for discharging the lubricant is formed on the relief valve in a state of communicating from the rolling face to an outer ring outer peripheral face.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lubricating structure for a rolling bearing used for jet engine main shaft support or other general industrial machines that require high-speed rotation.

  Conventionally, the purpose of lubrication in a rolling bearing is to form a thin oil film on the rolling surface and the sliding surface to prevent the metal and the metal from coming into direct contact, and has the following effects. (1) Reduction of friction and wear, (2) Drainage of frictional heat, (3) Extension of bearing life, (4) Rust prevention and prevention of foreign material intrusion.

  In order to exert these effects, it is necessary to use a lubrication method suitable for use conditions. In general, a jet engine main shaft support bearing that rotates at a high speed uses a minimum amount of lubricating oil to suppress heat generation due to agitation. For example, a jet lubrication method is employed.

  In the jet lubrication system, lubricating oil is accurately weighed and sent out at an optimum interval for each bearing, continuously pumped to the end of the oil supply pipe, and then sprayed onto the part requiring lubrication with a nozzle provided toward the bearing. Has a configuration. This lubrication method is widely used as a lubrication method suitable for speeding up the jet engine main shaft and increasing the temperature.

  Further, as shown in FIG. 5, as a bearing employing the jet lubrication method, lubricating oil supplied from a tank (not shown) is mixed with air sent from an air path (not shown) to form air oil, which is rolled through a nozzle 55. Some discharge to the bearing 51. The nozzle 55 has a discharge port opened toward the outer peripheral surface of the inner ring 52 of the rolling bearing 51 so that the air oil can be accurately discharged toward the bearing. (Patent Document 1)

JP 2014-149008 A

  However, while the bearing temperature during rated operation is about 100 ° to 200 ° C., the range of change in the ambient temperature of the bearing is wide, such as the temperature around the bearing is below freezing at the start of operation in a cold region. Therefore, when the specifications are set so that the radial clearance of the bearing and the fit between the bearing and the housing are fitted at the time of rated operation at a high temperature, the expansion of the bearing is caused by the housing due to the difference in thermal expansion coefficient between the bearing and the housing at low temperatures. Regulated and bearing internal clearance decreases. In this state, when the engine is started at a low temperature and the engine speed is increased at a stage where the housing is not sufficiently warmed, there is a concern that the risk of seizure of the bearing increases due to clogging of the bearing internal clearance (negative clearance). It was.

  The present invention has been made to solve such problems, and its purpose is to suppress the increase and decrease of the internal clearance of the bearing due to changes in the bearing ambient temperature, and to prevent the occurrence of seizure of the bearing regardless of the bearing ambient temperature. An object of the present invention is to provide a suppressed rolling bearing.

  The invention for solving the above problems includes an inner ring having a rolling surface on the outer peripheral surface, an outer ring having a rolling surface on the inner peripheral surface, and a pair of flanges at both ends of the rolling surface, A rolling bearing provided with a plurality of rolling elements between the inner ring and the outer ring and allowing the outer ring and the inner ring to rotate relative to each other, and a nozzle that discharges lubricating oil toward the rolling bearing. In the lubricating structure, a relief groove is formed between the rolling surface of the outer ring and the flange portion, and a discharge hole for discharging a lubricant is provided in the relief groove from the rolling surface to the outer ring. It is provided so as to communicate with the outer peripheral surface.

  According to the present invention, since the discharge hole is formed in the outer ring and the lubricant warmed in the bearing is discharged through the discharge hole, the housing can be quickly warmed. Thus, the clogging of the internal gap of the bearing can be suppressed. Thereby, the effect which can suppress generation | occurrence | production of the burning of a bearing is acquired.

It is a figure which shows the rolling bearing of the jet lubrication system which concerns on this invention. It is AA sectional drawing in FIG. It is a figure which shows the modification of the rolling bearing of the jet lubrication system which concerns on this invention. It is BB sectional drawing in FIG. It is a figure which shows the rolling bearing of the conventional jet lubrication system.

  The present invention will be described with reference to FIGS. The rolling bearing 1 includes an inner ring 2, an outer ring 3, and a plurality of rolling elements 4 that are between the inner ring 2 and the outer ring 3 and that allow the inner ring 2 and the outer ring 3 to rotate relative to each other. A rolling surface 2a on which the rolling element 4 rolls is formed on the outer peripheral surface of the inner ring. A rolling surface 3 a on which the rolling element 4 rolls is formed on the inner peripheral surface of the outer ring 3. In addition, a pair of flange portions 3b are formed so as to protrude from the rolling surface 3a at portions located on both ends in the bearing axial direction of the rolling surface 3a of the outer ring. Further, a pair of escape grooves 3c are provided at both ends of the rolling surface 3a where the flange 3b is provided, and a plurality of holes 3d communicating with the outer peripheral surface of the outer ring are formed in each escape groove 3c. ing.

  A nozzle 5 that discharges lubricating oil toward the rolling bearing 1 is disposed adjacent to the rolling bearing 1, and a nozzle hole 5 a is provided in the nozzle 5 to roll the inner ring 2 or the outer ring 3 of the rolling bearing 1. It protrudes toward the surface (2a or 3a). With this configuration, lubricating oil supplied from a lubricating oil supply source (not shown) is pumped through the nozzle 5 and discharged from the nozzle hole 5a to the rolling surface (2a or 3a).

  A space P is provided between the outer peripheral surface of the outer ring and the housing H in which the bearing is accommodated in a position corresponding to the hole 3d in the bearing axial direction. By adopting such a configuration, the lubricant supplied into the bearing 1 from the nozzle 5 is warmed by the bearing and discharged into the space P through the hole 3d. The discharged lubricant can quickly warm the housing H by heat exchange with the housing H constituting the space P, and can suppress a difference in thermal expansion between the bearing and the housing. Therefore, the effect of being able to suppress clogging of the internal gap of the bearing and to suppress the occurrence of seizure of the bearing is obtained.

  Further, FIGS. 3 and 4 are other modifications, in which the housing H is provided with a plurality of oil drain paths. An oil drainage passage H1 is provided in an annular shape on the inner peripheral surface of the housing that houses the bearing. The oil drain passage H1 is provided in the housing including a position facing the hole 3d of the bearing. Further, a plurality of oil drain passages H2 are provided in the radial direction of the inner peripheral surface of the housing so as to branch from the oil drain passage H1. Thus, by providing a plurality of oil drain passages on the housing side, the housing can be warmed more quickly.

DESCRIPTION OF SYMBOLS 1 ... Rolling bearing 2 ... Inner ring 3 ... Outer ring 4 ... Rolling element

Claims (1)

  An inner ring having a rolling surface on the outer peripheral surface, an outer ring having a rolling surface on the inner peripheral surface, and a pair of flanges on both ends of the rolling surface, and the outer ring between the inner ring and the outer ring, A rolling bearing lubrication structure comprising a rolling bearing provided with a plurality of rolling elements that enable relative rotation of the inner ring, and a nozzle that discharges lubricating oil toward the rolling bearing, wherein the lubricating structure of the outer ring A clearance groove is formed between the rolling surface and the flange portion, and a discharge hole for discharging a lubricant is provided in the clearance groove so as to communicate with the outer peripheral surface of the outer ring from the rolling surface. A lubrication structure for a rolling bearing characterized by comprising:

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