JP2016148415A - Rolling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make heat possessed by an external member or an internal member easily escape by using a raw material which is higher than the member in heat conductivity at least at a portion of the external member or the internal member of a rolling device, to reduce a temperature difference between the external member and the internal member of the rolling device, and to suppress that a preload becomes excessively large due to the temperature difference.SOLUTION: In a rolling device having an external member, an internal member and rolling bodies, a raw material which is higher than a portion other than one portion in heat conductivity is used at least at one portion of the external member or the internal member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling device, and more particularly to a rolling device suitable as a spindle bearing for a machine tool.

  Machine tool spindles tend to increase in speed in order to increase machining efficiency. As the speed of the main shaft increases, air oil lubrication is often used for lubricating the main shaft bearing, in which lubricating oil is mixed into the conveying air and the oil is injected into the bearing from the nozzle. Since general air-oil lubrication requires a large amount of high-pressure air and a large amount of noise, a new air-oil lubrication structure has been proposed for the purpose of low noise, energy saving, and resource saving (for example, Patent Document 1).

JP 2002-61657 A

  However, when only the structure of Patent Document 1 is used, the cost for supplying oil and air is high.

  Therefore, the present invention uses a material having a higher thermal conductivity than the other part of the outer member or the inner member of the rolling device, so that the heat of the outer member or the inner member is obtained. The purpose is to reduce the temperature difference between the outer member and the inner member of the rolling device, and to prevent the preload from becoming excessive due to the temperature difference.

  In order to solve the above problems, the present invention provides a rolling device comprising an outer member, an inner member, and a rolling element, wherein at least a portion of the outer member or the inner member is a portion other than the portion. A rolling device characterized by using a material having a higher thermal conductivity than that of the rolling device is provided.

  According to the present invention, the outer member or the inner member has at least a part of the outer member or the inner member of the rolling device by using a material having higher thermal conductivity than the part other than the part. Heat can be easily released, the temperature difference between the outer member and the inner member of the rolling device can be reduced, and excessive preload due to the temperature difference can be suppressed.

It is sectional drawing of the angular ball bearing which is an example of the rolling device of this invention. It is sectional drawing of the cylindrical roller bearing which is an example of the rolling device of this invention.

  Hereinafter, the present invention will be described in detail.

  In this invention, there is no restriction | limiting in the rolling device 5, For example, the angular ball bearing which is a ball bearing shown in FIG. 1, and the cylindrical roller bearing which is a roller bearing shown in FIG. The ball bearing or roller bearing shown in the figure is configured such that a ball as a rolling element 3 is held by a cage 4 so as to be freely rollable between an inner ring as an inner member 1 and an outer ring as an outer member 2. In addition, a high heat conductive member 6 having a higher thermal conductivity than the inner ring is used on the inner peripheral surface side of one end face of the inner ring. In this embodiment, the material of the inner ring is SUJ2 of high carbon chrome bearing steel of JIS G4805, and the material of the high heat conductive member 6 is carbon graphite having a higher thermal conductivity than SUJ2. The high heat conductive member 6 is molded in advance in accordance with the shape of a groove or a notch provided in the outer member 2 or the inner member 2 in advance, and is press-fitted into the outer member 2 or the inner member 1 for attachment. This is preferable for shortening the assembly time and making it difficult to remove the high heat conductive member 6.

  Further, for example, in the case of the rolling device 5 used for the main shaft of a machine tool, the high heat conduction member 6 is brought into contact with the main shaft, and preferably the cooling mechanism is provided on the main shaft, whereby the temperature of the inner member 1 is increased. 6 can be lowered. In the case of the rolling device for the main shaft, the inner ring rotates, and therefore the temperature of the inner ring is often higher than that of the outer ring. Therefore, a part of the inner ring is used as the high heat conduction member 6 as shown in FIG. It is possible to reduce the temperature difference between the outer member 2 and the inner member 1 of the moving device 5 and suppress an excessive preload due to the temperature difference.

  In this embodiment, since the temperature of the inner member 1 is higher than the temperature of the outer member 2, a part of the inner member 1 is the high heat conducting member 6, but the temperature of the outer member 2 is the inner member 1. When it becomes higher than this temperature, it is good also considering a part of outer member 2 as a high heat conductive member. Further, in this embodiment, the high thermal conductivity member 6 having higher thermal conductivity than the inner ring is used on the inner peripheral surface side of one end face of the inner ring, but not only on one end face but also on the end face on the opposite side in the axial direction. The high heat conductive member 6 may be used, or the high heat conductive member 6 may be used for the entire inner peripheral surface between one end surface and the end surface on the opposite side in the axial direction. Further, with respect to the circumferential direction, the high heat conduction member 6 may be used at one place in the circumferential direction, the high heat conduction member 6 may be used at a plurality of places in the circumferential direction, or the entire circumference in the circumferential direction. A high heat conductive member 6 may be used.

  By adopting such a structure, it is possible to reduce the temperature difference between the outer member 2 and the inner member 1 of the rolling device 5 and to prevent the preload from being excessive due to the temperature difference.

DESCRIPTION OF SYMBOLS 1 Inner member 2 Outer member 3 Rolling body 4 Cage 5 Rolling device 6 High heat conduction member

Claims (1)

In a rolling device comprising an outer member, an inner member, and a rolling element,
A rolling device characterized in that a material having higher thermal conductivity than that of the portion other than the portion is used for at least a portion of the outer member or the inner member.

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