DE2933316A1 - LUBRICANT FEEDER FOR THE SLIDING SURFACE OF SLIDING BEARINGS - Google Patents

Description

Lubricant supply to the sliding surface of plain bearings

The invention relates to the supply of lubricant to the sliding surface of plain bearings via any lubrication channels Profile, which are provided with a transition surface to the sliding surface.

To allow the lubricant to enter the sliding surface facilitate, it is generally known to provide a transition surface between the lubrication channels and the sliding surface to be attached, which in its simplest form is designed as a bevel · This creates sharp transition edges, which have an unfavorable effect on the operating behavior of the plain bearing · On the sharp transition edges sudden pressure changes occur in the flowing lubricant. Ss comes to turbulence and to local Increase in the pressure gradient in the working gap of the bearing · The flow stops. The consequences are cavitation erosion, increased flow resistance, lack of lubricant, increased friction due to uneven Wetting of the sliding surface and reduction of the hydrodynamic bearing load capacity, which leads to severe bearing damage being able to lead. The service life, especially with a high specific load, is considerable reduced.

030027/0557

ORIGINAL INSPECTED

Bs are a variety of suggestions for the design of the Transition areas. From DE-AS 1 182 909 cl. 47 b 8 and It is known from US Pat. No. 3,663,0-2 Kl. F 16 C 33/10 between the inner surface of the lubrication channels and the sliding surfaces Provide transition surfaces that are formed from one or more conical surfaces.

According to DE-OS 2 352 750 class F 16 C 33/10 it is known the transition between the lubrication channels and the sliding surface in the manner of a Wellenlijiie or saw-tooth-like Train line.

In another known embodiment (DE-OS 2 537 046 Class F 16 C 33/10) the lubrication channel is cylinder-hoofed designed.

According to the Polish standard PN-75 / M-87 105, the Transition areas determined by radius, which are dependent on the groove dimensions.

Each of the listed forms of transition surfaces facilitates the flow of lubricant more or less, but does not completely solve the problem, as it does for everyone of the examples cited, transition edges occur that have the aforementioned disadvantages. The specific wing loading the plain bearings with the design of the transition surfaces from the prior art are thus narrow There are limits.

It has been recognized that a tangential transition to Sliding surface offers advantages, but only the possibility of manual labor for its production (DE-OS 2 352 750, page 2). It should be obvious that the surface quality that can be achieved with manual work, e.g. scraping and accuracy is not very high.

030027/0557

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The great roughness, combined with considerable unevenness which are unavoidable in manual labor, cause vortices to form in the flow of lubricant, see above that the desired success does not seem attainable

The object of the invention is to create a sliding bearing of high load capacity, in which bearing damage by Inadequate lubrication can be avoided by using the transition surfaces between the lubrication channels and the sliding surface are designed so that the inflow with security of the lubricant in the sliding surface as a continuous flow, without interruption of the flow, with minimal Flow resistance takes place, a uniform wetting of the sliding surface is effected and no cavitation erosion entry·

To solve this problem, the invention provides that the lines of the profiles of the transition surfaces between the Lubrication channels and the sliding surface, which are formed by a symmetrical section of the transition surface with the plane is, which is determined by the outflow direction of the lubricant from the lubrication channels »the shape have an oval curve y * (f) χ, the convex side of which is directed into the interior of the lubrication channels, changes monotonically and tangentially connected to the sliding surface of the plain bearing * in a manner known per se is, where the surface quality of the transition surfaces the surface quality of the sliding surfaces is similar "

In a further embodiment of the invention, shapes the oval curve found necessary for the solution of the task taking into account the physical properties of the lubricant used are very cheap

Ö3Ö027 / O5S7

Was found to be particularly advantageous that the lines _f of the profiles of transitional surfaces approximate the shape of a clothoid · Also have an approximately trigonometric curve and an approximate exponential curve are well suited for the transition surface very.

The edgeless oval design of the transition surfaces of the lubrication channels reduces the flow resistance of the lubricant is essential and creates the continuous flow of the lubricant without interruption of the flow · Sudden drops in pressure at edges and other discontinuities that lead to gas escaping the lubricant and cavitation phenomena on the bearing surface are avoided · Such Lubricant supply guarantees a long service life of the bearing and allows a high specific surface loading of the sliding surface · The uniform and continuous wetting of the sliding surface also improves the conditions for the hydrodynamic Lubrication and cooling of the bearing · The low roughness of the surface avoids that, as is well known Flow resistance · It is therefore advisable to make the surface quality of the transition area similar to the surface quality to form the sliding surface

Embodiments

In the accompanying drawings FIG · Λ pointers a partial section through a sliding bearing

perpendicular to the bearing axis} Fig. 2 shows a section through a sliding bearing parallel

to the bearing axis with circumferential lubrication groove} Fig. 3 shows a section through a plain bearing parallel

to the bearing axis with an axial lubrication groove} Fig. 4 shows a side view of Fig. 3

Θ30027 / 0557

2933315

According to FIG. 1, a lubricant bore 3 is vertical attached to the longitudinal axis of the bearing 1. The inner surface 4 of the lubricant bore 3 is aligned with the sliding surface 2 connected by means of transition surface 5, which is an oval curve y a (f) χ of a hotboide is described whose lines tangential old of the sliding surface 2 of the bearing 1 and the Inner surface 4 of the lubricant bore 3 is connected

After Pig. 2 two lubricant bores 3 are provided} which open into a circumferential lubrication groove 6 · The connection of the sliding surface 2 with the side surfaces of the circumferential lubricating groove 6 is made by a transition surface 3, which according to the invention is an oval curve »which opens tangentially into the sliding surface 2 ·

In the embodiment according to FIG. 3 and FIG · 4 in the sliding surface 2 is an axial lubrication groove 7 is attached · In Fig x 4 _f is shown as side surfaces of the axial oil groove 7 are connected to the sliding surface 2 through the configured as oval curve transition flat 5 ·

In all exemplary embodiments, the transition surface 5 always connects tangentially with the sliding surface 2 and, as far as possible »also tangential to the side surfaces of the lubricant channels ·

The surface quality of the transition surfaces 4 is similar to the surface quality of the sliding surface 2 in order to be continuous Ensure flow of lubricant «The geometric shape of the transition surface is preferred designed as a clothoid »with the practical execution» manufactured with simple technological Average, with good reproducibility the best results were achieved · Also a trigonometric curve and a Exponential curves have proven to be suitable *

030027/0587

ORIGINAL INSPECTED

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Claims (1)

Claims ' 1.' Lubricant supply to the sliding surface of sliding bearings via lubricating channels of any profile which are provided with a transition surface to the sliding surface, characterized in that the lines of the profiles of the transition surfaces (5) between the lubricating channels (3; 6 | 7) and the sliding surface (2), the is formed by a symmetrical section of the transition surface (5) with the plane which is determined by the outflow direction of the lubricant from the lubrication channels (3 | 6 | 7), have the shape of an oval curve y «(f) χ, which with the convex side into the interior of the lubrication channels (3; 6 | 7), changes monotonically and is tangentially connected in a known manner to the sliding surface (2) of the sliding bearing (1), the surface quality of the transition surfaces (5) being the surface quality the sliding surfaces (2) is similar. 2, lubricant supply to the sliding surface of Gleitlar like according to claim 1, characterized in that the Lines of the profiles of the transition surfaces (5) of the lubrication channels (3 | 6j7) approximately have the shape of a clothoid to have. 3. Lubricant supply to the sliding surface of plain bearings according to claim 1, characterized in that the lines of the profiles of the transition surfaces (5) of the lubrication channels (3 | 6 | 7) approximately have the shape of a trigonometric curve. 4 ·. Lubricant supply to the sliding surface of plain bearings according to claim 1, characterized in that the lines of the profiles of the transition surfaces (5) of the lubrication channels (3 | 6i7) approximately has the shape of an exponential curve to have. 030027/0557 ORIGINAL INSPECTED