DE2718685A1 - Bearing for swing bridge - has rubber or plastic sliding surfaces lubricated by grease supplied at high pressure - Google Patents

Abstract

The pivot bearing of a swing bridge has a bearing surface (4) of rubber or plastic such as PTFE sliding against a metal surface (10). In conventional bearings of this type the initial charge of lubricating grease leaks away from the the joint surface resulting in an increase in friction. In order to maintain or renew the supply of grease a tube (1) is fitted which connects the central hole (2) with a connector (3) on the outer ring (6). A fresh supply of grease can then be injected under pressure through the tube to reach the sliding surfaces.

Description

P a t e n t a n m e 1 d u n g - arrangement for relubrication

of the sliding surfaces of rubber cup tilting bearings The invention relates to rubber cup tilting bearings for the transmission of large loads, especially in bridge construction, where the at one Rotation of the bearing cover around a horizontal axis (tilt axis) occurring rotational resistance by arranging sliding surfaces between the elastomer plate and the bottom of the pot or cover are largely switched off.

The formation of such sliding surfaces in rubber pot tilting bearings is Subject of patent no. 1 160 873.

This is where the structure of these bearings and the influence of the frictional forces are shown in the sliding surfaces on the deformation of the elastomer plate or on the rotational resistance described in more detail when a tilting movement occurs.

In practice, rubber pot tilting bearings with a paste-like type have proven to be good Lubricant to reduce the friction in the sliding surfaces as particularly economical proven.

However, it was found after a long period of operation that the The lubricating effect of the paste wears off over time and with it the resistance to rotation grow again.

The reason for the decrease in lubricity is that in particular the liquid component of the paste-like lubricant over time penetrates under the high pressure into the elastomer and thus for the lubrication of the Sliding surface is lost.

There is also a leakage of the lubricant at the seal between The wall of the pot and the lid cannot be completely avoided in the long run.

The object of the invention is to overcome this disadvantage, namely the loss the lubricating effect and thus the increase in unwanted rotational resistance to remedy any relubrication of the sliding surfaces that is possible at any time.

The solution to the problem is that within one to the lower Sliding surface open groove in the elastomer plate or in the bottom of the pot or partly in the elastomer plate partly in the bottom of the pot a lubricant supply and on their a lubricant distributor is arranged at one end, through the one at the other At the end and on the outside of the cup ring there is a new lubricant in the press-in socket the two sliding surfaces, i.e. in the contact surfaces between Elastomer plate and lid (upper sliding surface) or pot base (lower sliding surface) is pressed in under high pressure.

The embodiment according to the invention is shown in FIGS. 1-6.

Figure 1 shows a vertical section through the center of the bearing, FIG. 2 shows a horizontal section through the bearing at the level of the elastomer plate.

In Figures 3, 5a and 5b, a vertical section is in each case the arrangement of the lubricant supply according to the invention is shown. The figures 4 and 6 show possible embodiments for the lubricant distributor in a vertical section.

According to FIG. 1, the lubricant supply consists of one thin high-pressure pipe made of metal or plastic (1) and is inserted into one after the lower Groove (15) open towards the sliding surface in the elastomer plate (4). The groove can according to the invention also in the bottom of the pot (7) or partly in the elastomer plate (4) be arranged partly in the pot bottom (7) (see. Figure 3, 5a and 5b).

Depending on the height of the lubricant supply, the groove space can be below and above the lubricant supply according to Figure 3 and 5a through a rubber-like or solid filling compound (14) are filled. According to the invention, this can High-pressure pipe can also be surrounded by a cladding tube made of metal or plastic.

On the one hand, the lubricant feed (1) opens into a lubricant distributor (2), which is arranged approximately in the center of the elastomer plate.

It consists of a short piece of pipe that is open on both sides which the lubricant reaches up to the height of the two sliding surfaces and itself from here at a correspondingly high pressure as a thin film (10) in the two sliding surfaces spreads. The pipe piece can be made of metal or plastic and at his both ends can be provided with an annular lip (11). The lip prevents the penetration of the elastomer under high pressure into the pipe section is allowed however, the leakage of the lubricant into the two sliding surfaces.

The high pressure pipe penetrates the arrangement according to Figure 3 and 5b Wall of the lubricant distributor without being connected to it, and is preferably Arranged at right angles to the main tilt axis of the bearing (12).

When the middle areas of the elastomer plate slide moves relative to the cover and the bottom of the bearing as a result of a tilting movement The lubricant distributor is only located in the axial direction of the lubricant feed. The protrusion of the lubricant supply over the inner wall of the lubricant distributor is chosen according to the size of this shift.

In the arrangement according to FIG. 5a, the high-pressure pipe ends in the something extended groove below the lubricant distributor. In Figures 4 and 6 are various forms of embodiment of the lubricant distributor shown.

The lubricant distributor can also consist of two parts, the e.g. telescoped into one another in the middle (16), Figure 4, or with attached, annular sealing lips (11), Figure 6, are provided.

The lubricant supply on the other hand penetrates the pot wall (6) in a corresponding bore or in the groove and continued to the outside is on the outside of the pot wall or the bottom with this and the connector for a lubricant press or

a terminal screw firmly connected.

With rubber top bearings for very large loads and the correspondingly large ones The diameter of the elastomer plate can instead of a central lubricant distributor several lubricant distributors distributed in the sliding surface are also provided by separate or connected lubricant feeds be supplied with lubricant.

The diameter of the lubricant feed (1) is in particular at Arrangement according to Figure 3 small in relation to the thickness of the elastomer plate (4) chosen so that their elastic properties hardly even in the feed area be affected. The groove in the elastomer plate to hold the lubricant feed can thus also be kept very small and on the rubber-like filling compound (14) can often be omitted.

A possibly existing, annular gap at the penetration the cup wall through the lubricant feed can be elastomeric side in a simple Way to be closed by a sealing ring (13).

When arranging the lubricant supply according to Figure 5a is only Before assembling the bearing pot, cut a groove in the bottom of the pot into which the high-pressure pipe is inserted and welded tightly together with the pot wall. The movable connection of the lubricant distributor to the high pressure pipe is thus avoided.

These advantages have the disadvantage of reducing the cross-section of the on train in the plate level stressed pot base opposite. Depending on the load conditions and the size of the tilt angle or the deformations of the elastomer plate can thus corresponding to FIGS. 3, 5a and 5b, the favorable arrangement for the lubricant supply to get voted.

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Claims (6)

Claims 1 ') arrangement for relubrication of rubber cup tilting bearings, where the contact surfaces between the elastomer plate and the cover or base of the pot are separated in a known manner by a smear layer, characterized in that that at least one, running from the edge of the pot to the middle area of the elastomer plate, The groove in the elastomer plate is open towards the sliding surface between the elastomer plate and the bottom of the pot or arranged in the bottom of the pot or partly in the elastomer plate and partly in the base of the pot into which a thin high-pressure tube (1) made of metal connected to the edge of the pot or plastic is inserted, which is in or under one within the elastomer plate arranged, open towards the two sliding surfaces, in the plane of the sliding surfaces movable, pressure-resistant, thicker pipe section (2) made of metal or plastic flows out. 2. Arrangement as under 1), characterized in that the pipe section (2) has annular seals in the contact area with the two sliding surfaces. 3. Arrangement as under 1) and 2), characterized in that the High-pressure pipe (1) on the outside of the pot wall or the pot bottom through a Connection piece for the lubricant press is connected to this. 4. Arrangement as under 1) to 3), characterized in that within the high-pressure tube (1) of the lubricant feed through the elastomer plate Cladding tube is surrounded. 5. Arrangement as under 1) to 3), characterized in that the Lubricant distributors (2) consisting of two pieces of pressure-resistant pipe or several parts that interlock at the joint. 6. Arrangement as under 1) to 3), characterized in that the The gap between the pipeline and the wall of the pot is bridged on the inside by a sealing ring is.