FI94904B - Lubrication device for a Cardan shaft joint - Google Patents

Description

1 94904

PROPELLER SHAFT LUBRICANT LUBRICANT

The invention relates to a lubricator for universal joint shafts.

5 Today, the universal joints of the PTO shaft are periodically lubricated with a grease gun by pressing lubricant onto the grease nipple of the universal joint. According to the instructions, such lubrication should be carried out after each working day, but in practice the lubrication takes place, for example, once every 10 weeks. What makes lubrication difficult is that the joint gratings are often in hard-to-reach places, so they just don’t bother to treat them often enough. The prior art is described in SE 177 010, DE 674 500, DE 705 461 and DE 4 120 885. The publications 15 disclose fixed devices which are impossible to retrofit and which, when rigid and complex, are sensitive to damage and difficult to maintain.

The object of the invention is to eliminate the above-mentioned drawbacks. In particular, it is an object of the invention to provide a novel lubricating device which automatically lubricates the universal joint shafts of the cardan shafts.

With regard to the features characteristic of the invention, reference is made to the claims.

The lubricating device for PTO shaft grids according to the invention comprises a cylindrical lubricator body around the shaft, a lubricant space inside the housing bounded axially by the bearings and seals behind them, and a lubricator channel extending from the lubricant space to the lubricating combined with the body: through the lubricant source. According to the invention, the lubricating device comprises a sleeve resting around and rotating about the shaft, in which the lubricant channels 35 are arranged and around which the body is mounted with a lubricant space between the body and the sleeve and a flexible fastening supporting the body on an external support.

Thus, in the lubricating device according to the invention, the annular lubricant space is filled with lubricant and from there the lubricant enters the articulated trusses at the ends of the rotating shaft by means of the pressure down to the lubricant channels of the discharged earth. Because the sleeve is fixedly supported on the shaft, it rotates with the shaft while the body of the lubricator remains substantially in place as it rests with a flexible attachment on a suitable fixed support. In this case, the bearings and seals are flexible, rotating and slipping between the lubricator body and the sleeve, whereby lubricant can be continuously supplied to the substantially stationary lubricator body resting on the rotating shaft via a suitable pipe 15 from a suitable lubricant source.

The lubricant channel may extend in the sleeve only to one end thereof, but preferably the lubricant channel extends in the sleeve to both ends thereof for lubrication of the articulated grids at both ends of the shaft.

** 20 Preferably, the flexible attachment is provided by a chain, wire or similar element which prevents the body from rotating with the shaft, but which allows the body of the lubricator to vibrate and oscillate with the movements of the shaft with respect to the fixed support.

An advantage of the lubricating device according to the invention compared to the prior art is that the articulated gratings of the rotating cardan shaft can be lubricated continuously and automatically also during operation, whereby dimensioning the lubricant flow to keep the articulated gratings properly lubricated and in working condition.

Other advantages and various structural solutions of the invention will become apparent from the following description, in which the invention is described in detail with reference to the accompanying drawing, in which a lubricating device according to the invention is shown schematically and in section.

The lubricating device 3 94904 shown in the drawing comprises a sleeve 2 with a precisely round and smooth surface mounted around the cardan shaft 1 and a cylindrical body 3 at a distance from the sleeve around it. There are two bearings 7, 5 between the body and the sleeve. on the other side of the bearings there are annular seals 8 and on the outside there is an annular locking ring 10 with which the bearings and sealing rings are locked and pressed into place. In this way, the body 3 of the lubricator on the bearings 7 can rotate with respect to the shaft 1 and the sleeve 2 firmly supported thereon.

The lubricant space 6 is connected through the body 3 by a pipe 11 to an external source of lubricant. The frame 3 of the additional 15 is connected by a flexible fastening 4 to a fixed support 5, e.g. to the frame of a truck or other work machine.

In addition, the lubricating device comprises in the sleeve 2 a lubricant channel 9 extending from the lubricant space 6 • 20 to both ends 12 of the sleeve. From these ends proceed pipes 13 connected to the grease nipples of the articulated trusses at the ends of the shaft 1.

The lubrication device shown in the drawing works as follows. As the shaft 1 rotates, the sleeve 2 rotates with the shaft 25, but the body 3 of the lubricator remains substantially in place, while the resilient attachment 4 only gives way somewhat to minor vibrations and similar movements due to the rotation of the shaft.

Since the body 3 is thus in place, a lubricant can be continuously introduced 30 through the pipe 11, which ren-. ... from the gaseous lubricant space 6 it is possible to flow * · »: through the lubricant channel 9 in the hockey 2 to the pipes 13 supported on the shaft 1 and through them to the articulated trusses at the ends of the shaft. Thus, the lubrication device 35 shown in the drawing allows the lubricant to be transferred to the rotating shaft and along the shaft to the required lubrication points.

4 94904

The invention has been described above by way of example with the aid of the accompanying drawing, the various embodiments of the invention being possible within the scope of the inventive idea defined by the appended claims.

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Claims (7)

A lubricating-lubricating device for universal joints of PTO shafts / comprising a cylindrical lubricating device body (3) around the 5th axis (1), - a lubricant passage (9) extending from the lubricant compartment past the bearings and seals to the lubricated articulated grid with the lubricant compartment connected through the body to the lubricant source, characterized in that the lubricator comprises in which the lubricant channels (9) are arranged and around which the body (3) is mounted with the lubricant space (6) located between the body and the sleeve, and 20. a flexible fastening (4) supporting the body (3) to an external fixed support (5). Lubricating device according to Claim 1, characterized in that the lubricant channel (9) extends in the sleeve (2) to one end thereof. Lubricating device according to Claim 1, characterized in that the lubricant channel (9) extends in the sleeve (2) at both ends thereof for lubrication of the articulated grids at both ends of the shaft (1). Lubricating device according to one of Claims 1 to 3, characterized in that the flexible fastening (4) is formed by a chain, wire or the like which prevents the body (3) from rotating with the shaft (1) but allows the body to vibrate and oscillate. 35 (5). Lubrication device according to one of Claims 1 to 4, characterized in that the lubrication channel (9) of the lubrication 94904 6 is connected to the grease nipple of the articulated grid to be lubricated. 5 94904 Lubrication device according to one of Claims 1 to 5, characterized in that the seal 5 (8) is pressed against the inner jacket of the body (3) and the outer jacket of the sleeve (2) by locking rings (10). Lubricating device according to one of Claims 1 to 6, characterized in that the cross sections of the lubricant channels (9) extending to both ends of the shaft (1) are selected according to their lengths so that substantially the same amount of lubricant enters both ends of the shaft. il 'IM t «1 (1« - 7 94904