DE669309C - Lubricating device for plain bearings of fast running vertical or nearly vertical shafts - Google Patents

Description

Bibiiofheek Bur. Ind. Self-dom

17 JAN. 1939

ISSUED ON
DECEMBER 21, 1938

REICH PATENT OFFICE

PATENT LETTERING

~ M 669309
CLASS 47 e GROUP 1

Hans Schwarm in Nuremberg and 2) tpi.-3ng. Dr. Fritz Scharlach in Nuremberg

have been named as inventors.

Otto Scharlach company in Nuremberg

Patented in the German Empire on December 17, 1936

Plain bearings for high-speed vertical or almost vertical shafts are known, at the upper end an annular oil chamber have, of which the oil intended for the lubrication of the shaft between the shaft and bearing runs down. The oil runs out of the chamber into the upper part of the bearing either over one edge of the chamber or through one or two slightly sloping edges Channels. Since thin oil is used in these bearings, the oil supply must be the Chamber can either be replenished often as a result of the rapid oil flow, and that is used up Oil must be collected in bowls at the bottom, or an oil circulation device must be provided. Frequent re-oiling is a disadvantage for many machines that require little or no maintenance. With circulating devices the unused oil in the chamber is already used by supplying it Oil deteriorates. Furthermore, their installation in small machines is often possible.

To achieve low maintenance of vertical plain bearings where the Lubricant supplied in small quantities, but completely used up, were attempts Employed with plain bearings, in which a consistent lubricant was selected instead of thin oil, its toughness was precisely matched to the warming occurring in this camp. The lubricant should slowly drip and the bearing at normal load, normal speed and the resulting average temperature rise Just supply the amount of lubricant that is necessary to form a sufficient oil film is. The known plain bearings cannot be used for such lubricants: at them would get adequate lubrication and lubricant replenishment either at all not be possible or only possible in the upper part of the roll.

According to the invention are now from the annular Schmicrstoffkammer depending on Height of the plain bearing several almost

Right channels are drilled, each of which is in a different height part of the plain bearing opens out and the inside of the plain bearing bushing so close to the plain bearing inner wall lie that the lubricant content at a certain speed and load kept practically at the same temperature by the resulting frictional heat will. This means that, correct! ίο Provided that there is a lubricant determination a certain degree of heat, which is referred to as the normal working heat of the bearing likes, the lubricant in the dripping state, passes and at the lower openings the ducts leak into the plain bearing in very small quantities. By suitable trial and error these sliding amounts of lubricant can be kept so small that about a felt ring at the lower end of the The bearing is sufficient to keep the lubricant residues from escaping for a relatively long period of time suck up. If the machine is shut down and, shortly thereafter, the If the temperature of the bearing is reduced considerably, the lubricant takes its place again pasty state and stops dripping.

The rips of the mouth of the lubricant channels follow each other inside the plain bearing in terms of height without a gap, yes, for safety reasons they can still overlap, so · that every smallest height element of the wave instead of continuous Oil receives fresh lubricant from the chamber. Another advantage of the invention is their simple production .and the possibility also shown in the figure, the lubricating device to be retrofitted in a machine part.

Experiments have shown that in a bearing of the size shown in a Speed of several thousand revolutions per minute in 24 uninterrupted working hours not yet the twentieth part was consumed. The oil film in the plain bearing was regularly flawless after the test free. For this experiment it can therefore be assumed with certainty that the supply is approximately 500 to 700 hours of operation is sufficient. An exemplary embodiment is shown in the figures, namely:

Picture ι a partially sectioned view, Fig. 2 is a top view with sectional arrangement, Figs. 3 and 4 are two axial sections in different diameters, Figure 5 shows an embodiment of the bearing from one piece with the bearing cover of a bicycle dynamo,

Fig. 6 a development of the inner surface the axis bore with the successive mouth ellipses of the lubricant channels.

It denotes α the bearing body, b the lubricant chamber located above and c the bearing bore. The lubricant channels are labeled d _t to d $. The corrugation of the bearing body in the bearing outer diameter to secure the bearing against rotation has the designation ^.

The hole c receives the vertical or almost vertical high-speed shaft. The lubricant chamber b, the size of which is to be adapted to the purpose, holds a supply of lubricant sufficient for several hundred hours of operation. The channels Cl ₁ to Cl ₅ lead from the bottom of the chamber b to parts of the cylindrical inner surface of c.

Figure 6 shows a bearing design - made of one piece with the lid of a bicycle dynamo. This design is preferable if the bearing and cover are made of the same material can be chosen. You can z. B. made of brass or light metal pour or hot-press and then subsequently the bearing bore, lubricant chamber and channels easy to attach.

Claims (2)

Patent claims: ι. Lubricating device for high-speed vertical or almost vertical shafts, which run in a bush with lubrication holes for the shaft and have a lubrication chamber at the top for the supply of grease in particular, characterized in that the bush has a number corresponding to its height and inclined to the bearing axis vertical grease channels that are not drilled parallel and that are as vertical as possible and that lap downwards from the ring-shaped lubrication chamber located at the upper end of the liner, so that the lower channel openings are distributed as evenly as possible over the entire height of the inner surface. 2. Lubricating device according to claim t, characterized in that the mouths of the grease channels in the inner surface of the bearing bore without any height gap join each other or overlap. 1 sheet of drawings BERLIN. fiEDRI'CKT IN I) KR