NO861639L - KRYSSHODE TAPLE MACHINES FOR STAMP MACHINES. - Google Patents

Description

The invention relates to a crosshead journal bearing for piston machines, in particular diesel combustion engines, which is designed for lubrication with a lubricating oil which is supplied under pressure through a lubrication line.

Such a bearing is shown, for example, in CH 540 442. Here several lubrication bores arranged in a bearing part open directly into the bearing surface and are connected to the lubrication line. However, this known technique has disadvantages in that the pressure build-up is interrupted by the lubrication bores placed close to each other. This results in several "pressure peaks" with corresponding local stress on the bearing surfaces and early material fatigue.

It is the task of the invention to improve the initially mentioned cross-head bearing so that material fatigue is reduced and the lifetime of the bearing is increased.

The features and designs listed in the characterizing parts of the requirements serve to solve this task.

This results in a continuous "pressure peak" occurring between the lubrication pockets, which has a smaller maximum amplitude than in known designs. In this way, the load-bearing capacity of the bearing can be increased with the same outer dimensions. Due to the small lateral gradient of the undisturbed pressure tip, the local load of the bearing metal is reduced and thus the safety of the bearing is improved with regard to material fatigue.

A more detailed description of the invention follows on the basis of the embodiments shown in the drawing, where figure 1 shows a section of a cross-head journal bearing, figure 2 shows a section of the bearing in figure 1 along II-II, figure 3 shows a plan of the bearing seat of the bearing in figure 2, along III-III, figure 3a shows the pressure build-up of the bearing in figure 3, figure 3b shows a corresponding pressure build-up in a bearing according to known technology and figures 4-8 show different variants of the bearing in figure 3.

The crosshead journal bearing shown in figure 1 in a diesel engine, which is connected in a known manner to a piston rod 1, contains a hollow bearing journal 2 as well as a bearing housing 3 with a connecting rod 4. The bearing housing 3 contains in a known manner a bearing shell 5 with a bearing surface 6 of bearing metal. The bearing pin's cavity 8 is closed at its ends with covers 10. The bearing housing 3 is connected via a bore 15 in a known manner to a lubrication line 12 with a lubrication pump 13. For this, a known movable connection, for example with articulated pipes or a hose, serves.

Via the bore 15, lubricating oil can penetrate into a circumferential groove 17 to which radial bores 18, 19 are connected. The radial bores open into two lubrication pockets 20, 21 which are formed in the bearing surface 6 of the bearing cup 5 and which serve to absorb the lubricating oil supplied through the bores 18, 19. From the lubrication pockets 20, 21, the oil is pushed out axially in a known manner and is taken up in an oil collection pan, respectively fed back to the pump 13.

As can be seen from Figure 3, the lubrication pockets 20, 21, which open directly into the bearing surface 6, are arranged approximately in the edge area of the supporting bearing surface. Hereby, the angular distance between lubrication pockets 20, 21 is arranged next to each other, at least approx. 40° (figure 2).

As can be seen from figure 3a, the "pressure tip" 24 between the lubrication pockets 20, 21 is continuous and has a relatively small maximum amplitude A, while the design according to known technology in figure 3b shows that several "pressure tips" 24' occur between the lubrication openings 20' and have substantially larger maximum amplitudes A'.

Furthermore, the rise of the pressure gradient S in Figure 3a is significantly smaller than the corresponding value S<1> in Figure 3b, which likewise results in a smaller bearing load.

In the embodiment in Figure 4, the lubrication pockets 25, 26 have concave and convex curvatures 27, 28, respectively.

In the embodiment in Figure 5, the lubrication pockets 29 have a triangular circumference.

In the embodiment in Figure 6, the lubrication pockets 30, 31 have a semicircular or elliptical circumference, respectively.

In the embodiment in Figure 7, the lubrication pockets 32 have the appearance of a U-profile whose legs 36 are directed towards the edge 37 of the bearing surface 5.

Finally, figure 8 shows a modification of the design in figure 3, with three rectangular lubrication pockets 33, 34, 35.

Claims (8)

1. Cross-head journal bearings for piston machines, especially for diesel engines, which are designed for lubrication with pressurized lubricating oil supplied through a lubrication line, CHARACTERIZED BY the fact that at least two lubrication pockets ( 20, 21, 25, 26, 29-35 ) are arranged in a bearing , opens directly into the bearing surface (6) and is connected to a lubrication line (12, 15, 17, 18). 2. Bearing according to claim 1, CHARACTERIZED IN THAT the angular distance between the lubrication pockets is at least approx. 40°. 3. Bearing according to claim 1, CHARACTERIZED IN THAT at least one lubrication pocket is arranged in the edge area (37) of the bearing surface (6). 4. Bearing according to claim 1, CHARACTERIZED IN THAT the lubrication pockets (20, 21, 32-35) have a rectangular shape. 5. Bearing according to claim 1, CHARACTERIZED IN THAT the circumference of the lubrication pockets (25, 26, 30, 31) has at least one concave and/or convex curvature (25, 27). 6. Bearing according to claim 1, CHARACTERIZED IN THAT the lubrication pockets (30, 31) have a semicircular or elliptical circumference. 7. Bearing according to claim 1, CHARACTERIZED IN THAT the lubrication pockets (29) have a triangular circumference. 8. Bearing according to claim 1, CHARACTERIZED IN THAT the lubrication pockets (32) have the shape of a U-profile whose legs (36) are directed towards the edge (37) of the bearing surface (6).