DE6908891U - SIMPLEX INNER SHOE BRAKE - Google Patents

Description

Simplex inner shoe brake

The innovation relates to a simplex inner shoe brake with an S-shaped expansion cam, which is on both sides Engages rollers on the brake shoes. The rollers each sit on a bolt attached to the respective brake shoe web.

In the known brakes of this type, the rollers with their bolts are usually made from one piece. This has the Kachteil that when braking together with the roller, the bolt must also rotate and in the process in the relatively narrow Bremsbaekenstegen, in which it is stored rubs under load. Since the bearings of the bolts in the brake pad bars are not lubricated can result in a fairly rapid wear and tear and an unfavorable one Overall brake efficiency.

This disadvantage cannot be remedied in that the roller and the bolt are made of two parts. It arises here a bearing point between the roller and the bolt, which can be greased before installation; this will be greasing however ineffective depending on the time and the conditions of use, and eventually settles through dirt and abrasion the roller firmly on the bolt, which in turn is now in the brake

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cheek bars rotates. If the bolt is loose, there is also the difficulty of securing it axially.

According to the innovation, these disadvantages are avoided in that the rollers are rotatable on the respective bolt Intermediate layer of a self-lubricating bearing bush, a so-called oilless bearing, are arranged. Are useful here the bolts rotate in the respective brake shoe web and are anchored in an axially immovable manner.

The innovation ensures that each roller turns when the brake is operated on the bolt. That from The torque transmitted to the roller bearing is negligible, so the brake shoe webs are only statically loaded. the Bearing points are subject to practically no wear, and the result is a low surface pressure and good efficiency the brake.

According to a preferred embodiment, the bolts are flattened at both ends and are in the brake shoe web, the at least in the region of its end consists of two parallel ribs, in mouth-shaped recesses formed in these ribs hung that are too open to the cam. The shape of the recesses corresponds to the cross section of the flattened one Ends of the bolts. This enables quick and easy assembly and disassembly of the brake. The two-sided anchoring the bolt results in a favorable distribution of forces and enables a wide bearing bush to be used.

It is advisable to arrange ring disks on both sides of the roller on the bolt, which form the self-lubricating bearing bush cover. These disks also separate the rollers from each

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intermittent brake shoe bars. It is also possible in the bore of the roller on both sides of the self-lubricating bearing bush To arrange sealing rings, which is particularly useful for mobile machines proven to prevent the ingress of dirty water, mud or the like. The hole in the role can do this have a gradation at the location of the sealing rings.

Further details, advantages and features of the innovation emerge from the following description. In the drawing the innovation is illustrated, for example, namely show

Fig. 1 is a side view of part of an innovation according to the invention Simplex brake,

FIG. 2 shows a section in a plane II-II in FIG. 1, 3 shows a section corresponding to FIG. 2 through a modified embodiment.

A simplex brake has two brake shoes 1, Ί ¹ , which can be spread apart by rotating an S-cam 2 arranged between the brake shoe ends. The Semsbacken are provided with brake shoe webs 3, 3 ', in which rollers 4, 4 ¹ are mounted via bolts 5, 5 ^1. The rollers 4, 4 ¹ rest on the S-cam 2 on both sides.

To fix the bolts 5, 5 ¹ , the double! executed brake shoe ^{webs 3 »3 1} mouth-shaped recesses 6, 6 ¹ , in which the bolts 5, 5 * are inserted with flattened ends. They are thus non-rotatably and axially immovably connected to the brake shoe webs 3, 3 '.

The rollers 4, 4 ¹ sit rotatably on the bolts 5, or 5 'and are mounted on these via oil-free bearings 7, so that none

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Lubrication is required. The oilless bearings 7 are by Schei ben 8 or stepped disks 9 covered against dirt.

In the embodiment according to FIG. 3 there are still sealing rings 10 arranged on the side of the floating oil bearing.

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Claims (6)

I I It I · β «I *» ■ »O I ι β Μ ft» »t *» tr III ·> · '»Ο ·· Protection claims 1. Simplex inner shoe brake with an S-shaped expansion cam, which engages the brake shoes on both sides via rollers that are each seated on a bolt attached to the respective brake shoe web, characterized in that the rollers (4, 4 ¹ ) on the respective bolt ( 5, 5 ¹ ) are rotatably arranged with the interposition of a self-lubricating bearing bush (7). 2. Simplex brake according to claim 1, characterized gekenmseichnet that the bolts (5, 5 ¹ ) in the brake shoe web (3, 3 ¹ ) are rotatably anchored and axially immovable. 3. Simplex brake according to claim 2, characterized in that the bolts (5, 5 ^f ) are flattened at their two ends and in the brake shoe web (3, 3 ') formed therein from two parallel ribs in the mouth-shaped recesses (6, 6 ^l ) corresponding cross-section, which are too open to the cam (2), are attached. 4. Simplex brake according to one of claims 1 to 3, characterized in that on the bolts (5, 5 ¹ ) on both sides of the roller (4, 4 ¹ ) the self-lubricating bearing bush (7) covering ring disks (8, 9) are arranged. 5. simplex brake according to one of claims 1 to 4, characterized in that in the bore of the roller (4) on both sides the self-lubricating bearing bush (7) Dicbtrings (10) are arranged. 6. simplex brake according to claim 5, characterized in that the bore of the roller (4, 4 ¹ ) at the location of the sealing rings (10) has a gradation.