Lubricant recirculation system for the bearing of a rotating sha

Details Lubricant recirculation system for the bearing of a rotating sha Lubricant recirculation system for the bearing of a rotating sha

1980-08-15

1982-12-28

Levy, Stuart S.

Cutlery

308240, 308243, F16C 3366

Patent

active

043658512

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a lubricant recirculation system for the bearing of a rotating shaft, utilizing a slinger disk, and having a lubricant reservoir surrounding the periphery of the slinger disk. metal, but also of a non-metallic material, such as a felt-like fiber.


BACKGROUND

Bearings of the type described can be constructed so as to minimize or eliminate the loss of lubricant from the system and hence avoid a lack of lubrication, so that the bearing does not require maintenance during a very long operating time. Such bearings are wear-resistant and reliable, because they are lubricated sufficiently throughout their entire life. An additional advantage is that the lubricant is largely distributed in a manner which can be calculated in advance and is independent of acceleration, thereby leaving the center of mass of the shaft and the housing in its original position. Because the lubricant flows through the porous lubricant reservoir in its recirculation, the lubricant is continually filtered, so that no contamination which might cause wear reaches the bearing area. The lubricant reservoir can be made coaxial with the bearing.
A known bearing of this type (German Patent Disclosure Document DE-OS 26 09 736) has a wick serving as the device which carries the lubricant from the reservoir to the bearing surface. The wick can, if suitable, be formed by the reservoir itself, and touches the surface rotating with the shaft, thereby constantly brushing lubricant onto the surface. However, every wick contains dust and, in some cases, still other types of contamination. Further contamination develops due to the abrasion to which the wick is subjected by the surface which it brushes.
Even when the friction between the wick and the surface which it contacts is very slight, and the wick is hence subjected only to slight wear, the life time of the bearing is limited by wear of the wick.


THE INVENTION

It is an object to so construct the apparatus conducting the lubricant from the lubricant reservoir to the bearing surface in such a manner that no friction and hence no wear are produced while retaining the previously cited advantages of the bearing.
Briefly, according to the invention, the device conducting the lubricant from the lubricant source or reservoir to the bearing surface has a slot which is bounded on one side by a surface rotating with the shaft and adjoins the bearing surface, and on the other side by a porous surface of the lubricant reservoir. The porous surface does not touch the bearing components rotating with the shaft. The slot thus represents a dynamic pump. The system includes the above mentioned features as well as the features listed below, either individually or in a combination: (a) the slot tapers in the direction of the rotation and
(b) the slot is widened to form chambers at one or several positions along its circumference.
Within the slot, lubricant is sucked out of the porous surface of the lubricant reservoir defining the outside of the slot and thence reaches the bearing surface. The above described features have the effect of creating a reduced pressure within the slot.
Drawings, illustrating exemplary embodiments:
FIG. 1 is a block diagram of the lubricant recirculation path,
FIG. 2 is a longitudinal section through a sleeve bearing having the above mentioned configuration,
FIG. 3 is a longitudinal section through a similar sleeve bearing equipped with a commercially available sintered bearing,
FIG. 4 is a perspective sectional representation of a ball bearing having the above-cited configuration,
FIG. 5 is a longitudinal section through the ball bearing depicted in FIG. 4,
FIG. 6 is a perspective sectional view of a ball bearing configured in the manner cited above and having a loose outer race,
FIG. 7 is a longitudinal section of the ball bearing depicted in FIG. 6, and
FIG. 8 is a partial side view of the bearing depicted in FIG. 2 as seen in the direction of the arrows 8, and illustrating the slot.
The sleeve bearing, shown in FIG. 2, of a horizontal shaft 10 serves to supp

REFERENCES:
patent: 1705281 (1929-03-01), Bott
patent: 3915519 (1975-10-01), Lautner et al.
patent: 3944304 (1976-03-01), Purtschert
patent: 4181379 (1980-01-01), Letts
patent: 4241959 (1980-12-01), Frister

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