JPS6240235Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a self-lubricating bearing device using an oil disk.

Conventionally, self-lubricating systems for rolling bearings have had the configuration shown in FIG. 1 or 2. FIG. 1 shows an oil bath type bearing device, in which a rotating shaft 1 is rotatably supported by a bearing box 3 via a rolling bearing 2. As shown in FIG. In the figure, 2a is the outer ring of the rolling bearing 2, 2b is the rolling element (ball), and 2c is the inner ring. Further, 3a is a housing that supports the rolling bearing 2, and 3b is an oil reservoir. The lower part of the bearing raceway surface 2d is immersed in lubricating oil 4 stored in the oil reservoir 3b. In this configuration, the shaft 1 rotates and the rolling elements 2b
The rolling elements supply lubricating oil to the inner ring and outer ring raceway surfaces of the bearing, but since the rolling elements directly stir the lubricating oil 4, a large amount of stirring heat is generated, and the bearing cannot be cooled. However, it had the disadvantage of accelerating the deterioration of the lubricating oil. In addition, due to the above-mentioned stirring action, a waving phenomenon occurs on the oil surface, making it difficult to control the oil amount.
Considerable skill was required to manage the oil level. Second
The oil disk system shown in the figure was designed to eliminate the drawbacks of the oil bath system shown in Figure 1, and is currently widely used. In FIG. 2, reference numeral 5 denotes an oil disk, the peripheral edge of which is immersed in an oil sump, and the aforementioned bearing raceway surface is set in advance so as to be located above the oil level. As a result, the bearing itself does not stir the lubricating oil, and the generation of stirring heat can be suppressed as much as possible. However, a problem that was initially unthinkable was discovered. First of all, if the shaft is stopped for a long period of time, the bearing raceway surface may rust because it is not immersed in lubricating oil. Secondly, when the circumferential speed of the oil disk is low, such as during startup, there is almost no oil scraping ability, so the bearing rotates without oil, and the bearing may be damaged by heating. Thirdly, since the oil level was lowered below the bearing raceway surface, the diameter of the oil disk became correspondingly larger, the circumferential speed increased, and the agitation of the lubricating oil by the oil disk could no longer be ignored.

The present invention was developed in consideration of the above-mentioned points, and its purpose is to provide an oil-proof cover that covers the oil disc and the lower part of the rolling bearing in the oil reservoir in the bearing box in a self-lubricating system using an oil disc. At the same time, the oil disk and the lower part of the rolling bearing are immersed in the auxiliary oil sump formed by this oil-proof cover.When the shaft is stopped, the bearing raceway surface is immersed in lubricating oil, and during steady rotation, the oil disc and the lower part of the rolling bearing are immersed in lubricating oil. A supply path is formed between the oil sump and the auxiliary oil sump so that the oil level in the auxiliary oil sump is lower than the bearing raceway surface by scooping up oil from the disk, and the bearing raceway surface is supplied with oil by the oil disk. An object of the present invention is to provide a lubricated bearing device.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a sectional view of the self-lubricating bearing device according to the present invention, and FIG. 4 is a sectional view taken along line A--A in FIG. 3 and viewed in the direction of the arrow.

In FIGS. 3 and 4, the same parts as in FIGS. 1 and 2 are given the same reference numerals, and the explanation thereof will be omitted.
In FIG. 3, an oil supply side oil disk 5 and an oil drain side oil disk 6 are provided on the rotating shaft 2 adjacent to both sides of the rolling bearing 2. Note that the diameters of the oil disks 5 and 6 are selected to be larger than the diameter of the rolling bearing 2. Half-moon-shaped oil-proof covers 7 and 8 are provided to surround the lower portions of the oil disks 5 and 6, respectively, and a sub-oil reservoir 3c is formed in the oil reservoir 3b by the oil-proof covers 7 and 8 and the housing 3a. do. For convenience, the oil sump 3b will be referred to as the main oil sump. This oil-proof cover 7, 8
has a substantially L-shaped cross section, and is bolted to the housing 3a at the circumferential portion. Furthermore, only seven of the oil-proof covers 7 and 8 is provided with an oil supply path 9 at the lower central portion of its circumference. The size of this replenishment path 9 is selected so that the amount of oil disk scraped up is greater than the amount of replenishment. The upper straight portion 7a of these oil-proof covers 7 and 8 is connected to the shaft 1.
The dimensions are selected so that it always protrudes above the oil level regardless of the rotational state.

The oil level in the main oil reservoir 3b is selected to such an extent that the lower part of the rolling bearing 2 is submerged when the shaft 1 is stopped.

In the bearing device having the above configuration, the main oil reservoir 3b and the sub oil reservoir 3c are at the same oil level through the oil supply path 9 while the shaft is stopped. In this state, the bearing raceway surface 2d is immersed in the lubricating oil 4.

Next, when the shaft 1 starts to rotate, initially the sub oil sump 3c
The rolling elements 2b immersed in the lubricating oil 4 lubricate the rolling surfaces evenly. Gradually axis 1
When the sub oil reservoir 3c rotates at high speed, the lubricating oil in the sub oil reservoir 3c is scooped up by the oil disk 5 and discharged to the main oil reservoir 3b and supplied to the bearing section. As mentioned above, the amount of raking is greater than the amount of replenishment, so in the high-speed operating range of the shaft 1, the oil level in the sub oil reservoir 3c is lower than the oil level when stopped, and the lubricating oil in the oil disc 5 is lowered. The depth of immersion becomes shallower. The oil that has lubricated the bearing is discharged by the oil discharge side oil disk 6.

In this way, when the bearing is stopped and started, the lower part of the bearing raceway is soaked in oil and is sufficiently lubricated, so that a complete rust prevention effect can be obtained without running out of oil. Furthermore, during high-speed rotation, the oil level in the auxiliary oil sump is lower than the bearing raceway surface, and the oil disk is soaked in oil to the minimum extent necessary, and the main oil sump and the auxiliary oil sump are separated by oil-proof covers 7 and 8. Since the amount of oil to be stirred is very small, a large amount of stirring heat is not generated, and management of the amount of oil does not require skill as in the past.

The present invention is not limited to the embodiments described above, but can be implemented with appropriate modifications as described below.

(1) Instead of providing the oil supply path in the oil-proof cover, a gap or a groove may be provided at the attachment portion between the housing 3a and the oil-proof cover 7, or it may be provided directly in the housing 3a.

(2) Fins may be provided on the side surface of the oil disc 6 on the oil draining side to enhance the draining effect.

(3) The rolling bearing is not limited to a ball bearing, but may be another rolling bearing such as a roller bearing.

(4) The oil disc on the oil drain side may be omitted.

(5) As shown in FIG. 5, a pipe 10 may be provided in the oil supply path of the oil-proof cover 7 to supply cooled oil from the lower part of the main oil reservoir 3b.

As described above, the self-lubricating bearing device of the present invention has an oil disk placed on the side of the rolling bearing, and the oil disk and the lower part of the rolling bearing are covered with an oil-proof cover to separate it from the main oil sump. A secondary oil sump is provided, and the size of the replenishment path that communicates between the main oil sump and the auxiliary oil sump is selected so that the amount of replenishment is smaller than the amount lifted by the oil disk, and when the shaft is stopped, The bearing raceway surface is immersed in lubricating oil, and during steady rotation, the oil disk scrapes up the oil so that the oil level in the auxiliary oil reservoir is lower than the bearing raceway surface. However, there is no oil shortage on the bearing raceway surface, and a sufficient rust prevention effect can be achieved.During high-speed rotation, the depth of the oil disc immersion in the oil is the minimum necessary. The amount of oil that is stirred is extremely small, and the lubricating oil does not overheat, deteriorate, or leak due to the stirring phenomenon, and no skill is required to control the amount of oil.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views of a conventional example, and FIGS. 3 and 4 are sectional views showing an embodiment of the present invention, respectively.
FIG. 5 is a sectional view showing another embodiment of the present invention. 2... Rolling bearing, 3... Bearing box, 5... Oil disk, 7... Oil proof cover, 9... Supply path, 10... Pipe.

Claims (1)

[Scope of utility model registration request] A rolling bearing that rotatably supports a rotating shaft,
an oil disk fixed to the rotating shaft adjacent to a side surface of the rolling bearing; a main oil reservoir storing lubricating oil in an amount such that the rolling bearing and the lower part of the oil disk are immersed; and the rolling bearing and the oil. an oil-proof cover that covers the lower part of the disk and forms a sub-oil sump separated from the main oil sump; A self-lubricating bearing device comprising a replenishing path for replenishing oil from a reservoir to an auxiliary oil reservoir, wherein the lower part of the rolling bearing is immersed in lubricating oil when the rotary shaft rotates at low speed, but is not immersed during high-speed rotation.