DD247250A1

DD247250A1 - BEARINGS

Info

Publication number: DD247250A1
Application number: DD28846786A
Authority: DD
Inventors: Josef Jahn; Ralf Schedwill
Original assignee: Ifa Motorenwerke
Priority date: 1986-03-31
Filing date: 1986-03-31
Publication date: 1987-07-01

Abstract

Die Erfindung bezieht sich auf ueberbreite Gleitlager, die mit Lagerzapfen zusammenwirken, deren zylindrischer Teil ohne Durchmesserverringerung radiusfoermige Uebergaenge zu seitlichen Wandungen besitzt. Ziel der Erfindung ist es, die Funktionsbedingungen bezueglich solcher Kriterien wie Tragfaehigkeit, Verschleiss und Stoeranfaelligkeit zu verbessern, ohne die Grundabmessungen der Lagerung veraendern zu muessen. Zur Loesung der Aufgabe, den Prozess der plastischen Verformung der im Bereich der Radiusuebergaenge arbeitenden Lagerkanten zu unterstuetzen, ist erfindungsgemaess vorgesehen, im Bereich der ueber den zylindrischen Teil des Lagerzapfens hinausgehenden zylindrischen Verlaengerungen des Gleitlagers die Zweitschicht, also das auf der Lagerstuetzschale befindliche und von der Drittschicht bedeckte Lagermaterial mit einer Zone weicheren Materials zu versehen. Das Zusammenwirken von Gleitlager und radiusfoermigen Uebergaengen des Lagerzapfens fuehrt durch plastische Verformung des Unterbaues zu einer optimalen Anpassung der Lagerenden an den Gleitpartner. FigurThe invention relates to ueberber Gleitlager, which cooperate with bearing journals, the cylindrical part without radius reduction raindee radius has to lateral walls. The aim of the invention is to improve the operating conditions with respect to such criteria as load-bearing capacity, wear and failure, without having to change the basic dimensions of the storage. In order to solve the problem of supporting the process of plastic deformation of the bearing edges working in the region of the radius transitions, the second layer, that is, the one located on the bearing support shell and of the cylindrical extension of the bearing journal, is provided according to the invention Third layer covered bearing material to be provided with a zone softer material. The interaction of plain bearings and radius-shaped transitions of the bearing pin leads by plastic deformation of the base to an optimal adaptation of the bearing ends of the sliding partner. figure

Description

-Z-Ausführungsbeispiel-Z embodiment

Anhand einer Zeichnung, die ein Gleitlager mit Gleitpartner im Schnitt zeigt, wird die Erfindung näher erläutert. Die Darstellung ist so angelegt, daß oberhalb der Rotationsachse eine traditionelle Lagerausführung, unterhalb der Rotationsachse dagegen die erfindungsgemäße Ausführung des Gleitlagers gezeigt wird.Based on a drawing showing a plain bearing with sliding partners in section, the invention will be explained in more detail. The representation is designed so that above the axis of rotation, a traditional bearing design, below the axis of rotation, however, the inventive embodiment of the sliding bearing is shown.

Das auf einem Lagerzapfen 1 mit dem Durchmesser d, einem zylindrischen Bereich 2 der Breite b und radiusförmigen Übergängen 3 (Radius R) zu seitlichen Wandungen 4 arbeitende Gleitlager besitzt, eingebettet in einen Lagerstuhl 5, eine Lagerstützschale 6, eine darauf befindliche Zweitschicht, das Lagermaterial 7 und eine abschließende, dem Lagerzapfen 1 zugewandte Drittschicht 8 mit einer gegenüber dem Lagermaterial 7 geringeren Dicke D. Zwischen der Drittschicht 8 und dem Lagerzapfen 1 besteht ein Lagerspiel S, das jedoch erfindungsbedingt eine Einschränkung erfährt; das gesamte in seinem Aufbau beschriebene Gleitlager besitzt nämlich eine Breite B, die um beidseits vorgesehene zylindrische Verlängerungen V größer ist als der zylindrische Bereich 2 des Lagerzapfens 1, so daß zwischen den freien Enden dieser zylindrischen Verlängerungen V und den radiusförmigen Übergängen 3 ein gegen Null gehendes Lagerspiel entsteht. Erfindungsgemäß ist nun im Bereich der zylindrischen Verlängerungen V das Lagermaterial 7 mit einer Zone 9 weicheren Materials, das zur Drittschicht 8 hinweist, gepaart, wobei diese Zone 9 eine im Verhältnis zur Dicke des Lagermaterials 7 geringere Stärke Z besitzen kann. Dieser relativ weiche Untergrund der Drittschicht 8 ermöglicht durch den Lagerbetrieb einen plastischen Verformungsprozeß mit einer optimalen Anpassung des Lagerendes an den radiusförmigen Übergang 3, so daß die Anarbeitung von Fasen oder Ausrundungen an das Gleitlager entbehrlich istThe journal bearing 1 with the diameter d, a cylindrical portion 2 of the width b and radiused transitions 3 (radius R) to lateral walls 4 has sliding bearings embedded in a bearing block 5, a bearing support shell 6, a second layer located thereon, the bearing material 7 and a final, the bearing pin 1 facing third layer 8 with respect to the bearing material 7 thinner thickness D. Between the third layer 8 and the bearing pin 1 is a bearing clearance S, which, however, experiences a restriction due to the invention; Namely, the entire sliding bearing described in its structure has a width B which is larger on both sides provided cylindrical extensions V than the cylindrical portion 2 of the journal 1, so that between the free ends of these cylindrical extensions V and the radius-shaped transitions 3 going to zero Bearing play arises. According to the invention, the bearing material 7 is now paired with a zone 9 of softer material pointing towards the third layer 8 in the region of the cylindrical extensions V. This zone 9 may have a smaller thickness Z relative to the thickness of the bearing material 7. This relatively soft surface of the third layer 8 allows by the bearing operation a plastic deformation process with an optimal adjustment of the bearing end of the radius-shaped transition 3, so that the processing of chamfers or fillets on the sliding bearing is unnecessary

Zur Ermittlung eines möglichst optimalen Maßes für diese zylindrische Verlängerung V kann folgende Beziehung dienen: In order to determine an optimum dimension for this cylindrical extension V, the following relationship can be used:

V =1/r (S + D + |) - 0,25 (S + D +V = 1 / r (S + D + |) - 0.25 (S + D +

Die darin verwendeten Werte für den Radius R, das Lagerspiel Sund die Dicke D der Drittschicht 8 entsprechen vorzugsweise früher veröffentlichten Orientierungsgrößen.The values used for the radius R, the bearing clearance Sund and the thickness D of the third layer 8 preferably correspond to previously published orientation variables.

Claims

Invention claim:

Plain bearing, the bearing journal has a cylindrical portion with radiused transitions to side walls and the bearing support shell has a larger cylindrical area with the proviso that each such a radiused transition facing bearing end is adapted by chamfer or fillet, characterized in that the bearing support shell ( 6), bearing material (7) and third layer (8) existing bearings on both sides each have a cylindrical portion (2) of the journal (1) with the width (b) superior cylindrical extension (V), bringing with it the larger cylindrical Width (B) according to the relation B = b

+ 2 V, and that the second layer representing bearing material (7), optionally including the bearing support shell (6), in the region of the cylindrical extension (V) has a zone (9) softer material.

Sliding bearing according to item 1, characterized in that the zone (9) of softer material has a lower thickness (Z) than the second layer and is in contact with the third layer (8). Sliding bearing according to items 1 and 2, characterized in that the dimension of the cylindrical extension (V) preferably the relationship

V η / R (S + D + |) - 0.25 (S + D + |) ²

corresponds, wherein R is the radius of the radius-shaped transition (3) between the bearing journal (1) and side wall (4), D is the height of the third layer (9) and S is the bearing clearance.
4. plain bearing according to item 1 to 3, characterized in that it is designed without a third layer (8).

For this 1 page drawing

Field of application of the invention

The invention is applicable to all journal bearings with a pin whose cylindrical portion without Durchmepserverringerung has a radius transition to the side of the bearing located walls.

Characteristic of the known technical solutions

It has already been proposed in an earlier application, in a sliding bearing, which works on a cylindrical pin, which in part without diameter reduction to lateral walls continuing radius transitions additionally include in the bearing surface (DD-WP F 16 C / 2756758). For this purpose, the slide bearing width has been increased beyond the dimension of the cylindrical journal portion and designed constructively corresponding to each bearing edge cooperating with the radius transition. This was done by means of chamfer or rounding with the proviso that takes place in the bearing operation by plastic deformation and wear another formadäquate adjustment.

Object of the invention

By the invention, the functional conditions for the proposed slide bearing design to be improved without having to increase the storage area by increasing the diameter or the storage chair.

Explanation of the essence of the invention

The technical problem to be solved by the invention is to constructively support the process of plastic deformation of the bearing edges operating in the region of the radius transitions in order to enable an over-wide bearing design. According to the invention, this object is achieved in that, in the region of the cylindrical extension of the bearing beyond the cylindrical region of the bearing journal, the bearing material located between the bearing support shell and the outer third layer has a zone of softer material. It is also possible that the zone of softer material extends into the bearing support shell.

According to a special feature, this zone of softer material has a lower thickness than the bearing material, in contact with the third layer.

For the dimensioning of the cylindrical extension, a favorable relationship was found between the radius of the radius transition from the journal to the lateral wall, the height of the third layer, the bearing clearance and the thickness of the zone of softer material; It is shown in the description of the embodiment. Finally, the plain bearing design according to the invention is also possible without the aforementioned third layer being provided. The solution according to the invention makes use of the fact that the lowest lubricant film pressure is established in the edge area of the bearing, and makes it possible to exploit the non-cylindrical part of the bearing journal even more than the prior art shown. In addition, can be dispensed with the processing of chamfers or fillets at the bearing end, since such edge breakage as a result of contact of the bearing with the radius-shaped transition as plastic deformation or adjustment of self-adjusts.