JPH0530558U - Lubricator for cylindrical roller bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent insufficient lubrication at the contact area between the flange surface and the end surface of the guide flange during high-speed rotation. [Structure] A circumferential groove 16 is provided on one end surface of the inner ring 10, and the circumferential groove 16 is provided with a first lubricating passage 17 and a second lubricating passage 18 which are independent of each other. ,
The guide collar 10b communicates with the necked portion 10c on the collar surface.
The lubricating oil supplied from the injection hole 19b of the lubrication nozzle 19 toward the circumferential groove 16 passes through the first lubrication passage 17 and the second lubrication passage 18, and passes through the recessed portion 1 of the collar surfaces 10d on both sides.
0c is supplied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating device for a cylindrical roller bearing used in a high-speed rotating shaft such as a main shaft of a machine tool.

[0002]

[Prior Art]

 As a cylindrical roller bearing for a machine tool spindle, a so-called N-type cylindrical roller bearing in which a guide flange 9 for the roller 5 is provided on the inner ring 2 as shown in Fig. 5 is often used for reasons such as high speed and ease of assembly. Has been done. This cylindrical roller bearing has an inner ring 2 fixed to a rotating shaft 1, an outer ring 4 fixed to a housing 3, a roller 5 rolling between the inner and outer rings 2 and 4, and a roller 5 circumferentially. The retainer 6 which holds at equal intervals is a main component. Then, the lubrication of the cylindrical roller bearing is performed from the injection holes 8 of the lubrication nozzles 7 fixed on both sides of the outer ring 4 toward the space between the outer diameter of the guide collar 9 and the inner diameter of the cage 6. It was done by injecting.

[0003]

[Problems to be solved by the device]

 By the way, one of the factors that hinder the high speed performance of the N-type cylindrical roller bearing is insufficient lubrication at the contact portion between the end surface of the roller 5 and the flange surface of the guide flange 9. This insufficient lubrication means that the lubricating oil supplied to the space between the outer diameter of the guide collar 9 and the inner diameter of the retainer 6 is blown out in the outer diameter direction by the high speed rotation of the inner ring 2, and the contact portion is not enough. It happens because you don't cross. Further, since the lubricating device having the above-mentioned configuration uses a pair of lubricating nozzles 7 to supply oil from both sides of the bearing, the number of parts is large, and there is room for improvement in terms of assemblability and cost.

Therefore, an object of the present invention is to provide a lubricating device which can supply an optimum amount of oil to a contact portion between the flange surface and the end surface of the guide collar even at the time of high speed rotation and has a small number of parts. To do.

[0005]

[Means for Solving the Problems]

 The cylindrical roller bearing lubrication device of the present invention is provided with a circumferential groove on one end surface of a bearing inner ring having roller guide collars on both sides of the rolling surface, and the circumferential groove and the collar surface on one side are provided. The inner diameter side of the bearing is communicated with the first lubrication passage, and the circumferential groove is communicated with the inner diameter side of the collar surface on the other side with the second lubrication passage so that one of the bearings faces the circumferential groove. The feature is that fuel is supplied from the side of.

[0006]

[Action]

 The lubricating oil supplied from one side of the bearing is received by the circumferential groove and is supplied to the inner diameter side of the flange surfaces on both sides via the first and second lubricating passages. Then, this lubricating oil moves in the outer diameter direction along the flange surface due to the centrifugal force accompanying the rotation, and performs a lubricating action at the contact portion between the end surface of the roller and the flange surface.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the cylindrical roller bearing of this embodiment is an N-type cylindrical roller bearing similar to the conventional one shown in FIG. 5, and an inner ring 10 having guide flanges 10b on both sides of a rolling surface 10a. , An outer ring 11, rollers 12 rotatably interposed between the inner and outer rings 10, 11, and cages 13 for holding the rollers 12 at equal intervals around the circumference.

The inner ring 10 is fixed to the rotating shaft 1, and both ends thereof are positioned by the inner ring spacer 15. A circumferential groove 16 is provided on the end surface on one side of the inner ring 10, and the circumferential groove 16 is provided with a guide collar via a first lubricating passage 17 and a second lubricating passage 18 which are independent of each other. It communicates with the necked portion 10c of the collar surface of 10b. The outer ring 11 is fixed to the housing 3, and a lubricating nozzle 19 also serving as an outer ring spacer abuts on one end surface of the outer ring 11. The lubricating nozzle 19 is provided with a supply passage 19a communicating with the lubricating oil supply passage 3a of the housing 3 and an injection hole 19b for injecting the lubricating oil from the supply passage 19a toward the circumferential groove 16.

As shown in FIG. 2, the first lubrication passage 17 is composed of an axial passage 17a and a radial passage 17b, and communicates with the recessed portion 10c of the collar surface 10d on one side. On the other hand, the second lubrication passage 18 is composed of an axial passage 18a and a radial passage 18b, and communicates with the recessed portion 10d of the collar surface 10d on the other side.

As shown in FIG. 3, the first lubrication passage 17 and the second lubrication passage 18 may be formed in any number in the circumferential direction, and the number, shape, and size of the first lubrication passage 17 and the second lubrication passage 18 may be the bearing size, the required oil amount, or the like. Based on. In this embodiment, the first lubrication passages 17 and the second lubrication passages 18 are alternately formed, but the second lubrication passages 18 having a long passage length (passage resistance increases). The number may be increased. Alternatively, the hole diameter of the second lubrication passage 18 may be increased.

The lubricating oil supplied from the injection hole 19b of the lubrication nozzle 19 toward the circumferential groove 16 passes through the first lubrication passage 17 and the second lubrication passage 18 and is squeezed on the collar surfaces 10d on both sides. It is supplied to the section 10c.

FIG. 4 shows an embodiment in which the circumferential groove 16 is inclined in the outer diameter direction toward the recessed portion 10c in the configuration shown in FIG. The effect of receiving the lubricating oil from the injection hole 18b and the effect of supplying the lubricating oil to the recess 10c can be improved.

[0014]

[Effect of the device]

 According to the present invention, the lubricating oil is supplied to the inner diameter side of the flange surface of the guide flange, so that even at high speed rotation, insufficient lubrication does not occur in the contact portion between the roller end surface and the flange surface, and the bearing life is improved. It is possible to improve. Also, by supplying the lubricating oil from one side of the bearing, it is possible to lubricate both end faces of the roller, so the number of parts is reduced compared to the conventional lubrication device, and the assemblability and cost efficiency are reduced. Is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the inner ring in FIG. 1 (FIGS. A and b).
Is.

FIG. 3 is a side view (FIG. A) of the inner ring in FIG. 1 and an outer radial direction arrow view (FIG. B).

FIG. 4 is a cross-sectional view showing another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional lubricating device.

[Explanation of symbols]

 10 Inner ring 10a Rolling surface 10b Guide collar 10c Neck part 12 Roller 16 Circumferential groove 17 First lubrication passage 18 Second lubrication passage 19b Injection hole

Claims (1)

[Scope of utility model registration request] 1. A circumferential groove is provided on one end surface of a bearing inner ring having roller guide collars on both sides of the raceway surface, and the circumferential groove and the inner diameter side of the collar surface on one side are the first. And communicate with the lubrication passage of No. 2 and connect the circumferential groove and the inner diameter side of the other flange surface to the second side.
The lubricating device for a cylindrical roller bearing is characterized in that the lubricating passages are communicated with each other and oil is supplied from one side of the bearing toward the circumferential groove.