JPS61286697A - Self-lubricating device for bearing - Google Patents

Abstract

PURPOSE:To check a leakage of lubricating oil being scraped up, by installing a guide plate, guiding the lubricating oil scraped up from an annular layer to the bearing side, in the nonrotational outer ring installed in an outer circumferential part of an oil disc. CONSTITUTION:An annular layer 10 constituted of a rolling element 11 and a cage 12 is impregnated in lubricating oil in its lower part so that it scrapes up the oil at slower revolving speed than that of a rotary shaft 1. The lubricating oil being scraped up tries to scatter around but it is carried to an upper part of a bearing 2 as being checked by a first guide plate 13 and scooped up to an oil feed port 7 so effectively. Likewise, the lubricating oil being scraped up tries to scatter from the bearing opposite side of an oil disc 3 as well, but it is restrained from doing so because a more upper part than an oil lever of the annular layer 10 is closed by a second guide plate 13b so that it is discharged to the bearing side of the disc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lubricating device for a bearing, and more particularly to a device for pumping up and supplying lubricating oil using an oil disk on a shaft.

[Technical background of the invention and its problems] It is well known that a disc-shaped oil disk is widely used as one of the self-lubricating systems for bearings. Unlike an oil ring, this oil disc rotates integrally with the shaft, so it is extremely reliable in terms of oil supply reliability.

By the way, as the circumferential speed of the bearing surface and the applied load increase, there is naturally a limit to the amount of oil supplied by the oil disk, so there is a so-called forced oil supply system that uses an electric pump to exceed this limit.

However, the forced lubrication system has a complicated structure and is troublesome to maintain, and also has extremely disadvantageous factors in terms of labor and resource conservation, such as backup in case of failure of the electric pump or power outage.

Therefore, there is a strong desire to expand the scope of application of self-lubricating using an oil disk, which is advantageous in this respect. A disadvantage of oil disks is that as the outer circumference of the disk becomes higher, the amount of pumped lubricating oil that is thrown away increases, and if the circumferential speed exceeds the desired amount of pumped oil, it becomes impossible to obtain the desired amount of pumped oil.

In view of these problems, the present applicant has already proposed a self-lubricating device for a bearing as disclosed in Japanese Patent Application No. 177421/1983 (IB) as a solution.

This invention consists of an outer ring that does not rotate the oil disk, an inner ring that rotates together with the shaft, and an annular layer that is formed between the two and whose lower part is immersed in lubricating oil and rotates at a rotation speed slower than the rotation speed of the shaft, Even if the shaft rotates at high speed, the peripheral speed of the annular layer that pumps up the lubricating oil is slowed down to increase the amount of lubricating oil pumped up.

With this invention, the amount of oil can be greatly increased compared to the conventional integral disk-shaped oil disk, and the range in which the bearing can be operated with self-cooling has been expanded.

However, even with this invention, the oil scraped up by the oil disk is not yet supplied to the bearing without waste.

In other words, there is a considerable amount of leakage when the scraped oil is received by the scraper.

[Object of the Invention] An object of the present invention is to provide a self-lubricating device that can effectively supply lubricating oil to a bearing by suppressing leakage of lubricating oil scraped up by an oil disk using a guide plate.

[Summary of the Invention] In order to achieve the above object, the present invention provides an oil supply device in which lubricating oil stored in the lower part of the bearing box is supplied to the bearing surface of the rotating shaft by an oil disk of the rotating shaft. The oil disk consists of a non-rotating outer ring provided on its outer periphery, and an annular layer formed between the outer ring and the rotating shaft, the lower part of which is immersed in lubricating oil and rotates at a rotation speed slower than the rotation speed of the rotating shaft. The present invention is characterized in that a guide plate is provided on the outer ring to guide the lubricating oil scraped up by the annular layer to the bearing side, thereby suppressing leakage of the scraped up lubricating oil.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a bearing device equipped with a self-lubricating device, in which an oil disk 3 is mounted on one side of a sliding bearing 2 that supports a rotating shaft 1, and an oil disk 3 is mounted on one side of a sliding bearing 2 that surrounds these members. A bearing housing 4 supporting 2 is shown.

The structure of the oil disk 3 will be briefly described, but this oil disk 3 rotates together with the rotating shaft 1, scoops up the lubricating oil 5 stored in the lower part of the bearing box 4, and guides it to the bearing side by the non-rotating outer ring of the oil disk. The lubricant flows into the bearing's oil supply lower.

Here, the oil disc 3 will be explained with reference to FIG. An annular inner ring 9 is fixed to a part of the rotating shaft 1 by shrink fitting. An outer ring 13 is provided on the outer peripheral side of the inner ring 9 with an annular layer 10 interposed therebetween. The annular layer 10 includes the inner and outer rings 9.
13, a plurality of rolling elements 11 made of spheres that are fitted into the raceway and can be moved in the circumferential direction, and an annular retainer 12 that slidably encloses the rolling elements 11 from both sides in order to maintain the distance between the adjacent rolling elements. It is composed of.

A groove 14 extending in the axial direction is provided in the upper part of the outer ring 13, and a pin 8a protruding from a support 8 fixed to the bearing is loosely inserted into this groove.
prevents it from rotating.

The outer ring 13 has a first guide plate 13a protruding from the bearing side, and a second guide plate 13b protruding from the opposite side of the bearing. The first guide plate 13a is bolted to the outer ring 13 or provided integrally with the outer ring 13, protrudes like an eave toward the bearing side along the inner diameter of the outer ring 13, and further extends into a disc along the circumferential direction as shown in FIG. It is formed so as to cover the scraping side caused by the rotation of the bearing 2 and the oil supply lower part of the bearing 2.

The second guide plate 13b has an annular shape with a part missing, and the outer ring 1
3 is bolted or integrally provided, and the space between the outer ring 13 and the inner ring 9 is closed by creating a minute gap with the outer peripheral surface of the inner ring 9, and the area below near the oil level ○L is opened by a notched part. There is.

The immersion positional relationship between the oil disk support and the lubricating oil 5 configured as described above is such that the oil level ○L is set to be at or slightly lower than the outer peripheral surface of the lowest part of the inner ring 9.

Next, the effect will be explained. As the rotating shaft 1 rotates, the inner ring 9 also rotates at the same rotational speed. When the inner ring 9 rotates, the rolling elements 11 in contact with the inner ring 9 rotate on their own axis and revolve around the orbit at a rotation speed slower than that of the rotating shaft. As the rolling elements 11 revolve, the cage 13 attached thereto also revolves at the same rotational speed as the rolling elements 11. In other words, the annular layer 10 composed of the rolling elements 11 and the retainer 12 has its lower part immersed in lubricating oil, so it scrapes up oil at a rotation speed slower than the rotation speed of the rotating shaft 1. The scraped up lubricating oil tends to scatter due to centrifugal force, but is carried to the upper part of the bearing 2 while being suppressed by the first guide plate 13a, and is effectively pumped up to the oil supply lower.

Furthermore, the scraped up lubricating oil also tries to scatter from the opposite side of the oil disc 3 to the bearing, but
Since the upper portion of the annular portion 11!10 is closed off, the oil is suppressed and discharged toward the bearing side of the disk.

In this way, this oil supply device has the first guide plate 13 of the outer ring.
The amount of pumped oil increases due to a, and the second guide plate? 3
It can be further increased by b.

FIG. 4 shows the relationship between the amount of lubricating oil pumped up to the bearing and the rotational speed of the rotating shaft in an experiment using the oil supply device according to this embodiment.

For comparison, the pumping characteristics a of a conventional integrated oil disk are also shown, and the dimensions of the oil disk are set to be the same. (In this experiment, the inner diameter of the outer ring was made approximately the same as the outer diameter of 290 mm of the conventional A-or disc, and the rolling elements were provided with eight balls at equal intervals.) As is clear from this figure, the pumping according to the present invention The characteristics are significantly improved compared to an oil disc without a guide plate (curve b).

Curve C has only the first guide plate 13a provided on the outer ring, and curve 6 has the first guide plate 13a and second guide plate 13b provided on the outer ring.

[Effects of the Invention] According to the present invention, an oil disc that scoops up lubricating oil from a bearing box and supplies it to the bearing surface of a rotating shaft is formed by an outer ring that does not rotate on its outer periphery and between this outer ring and the rotating shaft. The lower part is immersed in lubricating oil and rotates at a rotation speed slower than the rotational speed of the rotating shaft.It is composed of an annular layer that rotates at a rotation speed slower than the rotation speed of the rotating shaft, and is equipped with a guide plate that guides the lubricating oil that has been blown up to the outer ring to the bearing side, so it can be effectively applied to the bearing. Lubricating oil can be supplied and the self-cooling range of the bearing can be expanded.

[Brief explanation of drawings]

FIG. 1 is a front view of a bearing device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1 and viewed in the direction of the arrow, and FIG. FIG. 4 is a perspective view showing a part of the oil disk in cross section, and a characteristic curve diagram showing the relationship between the rotational speed of the rotating shaft and the pumped oil m in comparison with a conventional one. 1... Rotating shaft, 2... Bearing, 3...
oil disc, 4... bearing box, 5... lubricating oil,
7... Fuel filler port, 9... Inner ring,
10... Annular layer, 13... Outer ring, 1
3a...first guide plate, 13b...second guide plate. Agent Patent Attorney Kensuke Chika (and 1 other person) Figure 3 Figure 4

Claims (1)

[Claims] 1) An oil supply device in which lubricating oil stored in the lower part of the bearing box is supplied to the bearing surface of the rotating shaft by an oil disk of the rotating shaft, wherein the oil disk is provided on the outer periphery of the oil disk. It consists of an outer ring that does not rotate, and an annular layer formed between the outer ring and the rotating shaft, the lower part of which is immersed in lubricating oil and rotates at a rotation speed slower than the rotational speed of the rotating shaft. A self-lubricating device for a bearing, characterized in that it is provided with a guide plate that guides the oil toward the bearing side. 2) The self-lubricating device for a bearing according to claim 1, wherein the guide plate is formed to protrude toward the bearing and cover at least an oil filler port provided at an upper portion of the bearing. 3) The guide plates include a first guide plate that protrudes toward the bearing side and is formed to cover at least the oil filler port provided at the top of the bearing, and a second guide plate that covers the annular layer on the opposite side of the bearing with its lower part opened. A self-lubricating device for a bearing according to claim 1, comprising: