DE1941807B2 - SLIDING ELEMENT, IN PARTICULAR SLIDING STONE, FOR TRANSMISSION OF DRIVE FORCE IN TRANSFER LINES OF MACHINERY, PREFERABLY DRIVES - Google Patents

Description

The invention relates to a sliding element, in particular sliding block, for transmission. Driving forces for translatory, rotary and oscillating movements in transmission links, like clutches. Articulated spindles and the like of machines, preferably drives.

It is proposed for a joint for connecting two shafts, in which one shaft has a spoon-like extension , which is mounted in a housing ν by means of movably mounted sliding bars. that establishes the connection / u of the other way of guiding the shaft carrying the spoon in a groove of the spoon through a corresponding elevation on the sliding block and this on the outer diameter of the housing, the sliding blocks having grooves extending radially from the elevation forming a centering part on the spoon side, which are kept shorter than the width of the spoon. The core of the sliding blocks should be made of an elastic building material such as polyurethane. Made of rubber or synthetic rubber. The sliding pieces can also have a multilayer design and preferably consist of a lower layer made of steel, a middle layer made of aluminum and an upper layer made of polytetrafluoroethylene or a similar building material. With this joint, play-free work is to be guaranteed due to the large contact surfaces of the parts sliding one on top of the other. A backlash-free mounting in the installed state should be achieved by applying a preload, which is intended. so that different biases are present in the central guide zone and in the edge zones. In the case of a one-piece sliding block made of elastic plastic, the different prestressing is achieved in that the sliding block has a membrane-like connection of the wall thickness around the centering part and a longitudinal channel. In this case, the stresses can be changed in the longitudinal direction by means of relief grooves from the wall, the depth of the grooves determining the stresses.

In the case of this pre-stressed joint, the backlash-free construction of the joint is achieved in that the moving parts are pretensioned, the pretensioning being achieved by reducing the wall thickness through longitudinal channels and different deep grooves. Here, the guide ¹ / or the elastic core of the Oleitstein is already prestressed in the unloaded state. This means that a rigid body in itself is transformed by HoWrÜHrne into a springy body, which adapts to the loads due to its spring character. However, this does not result in an adaptation Wi the counter-shape in terms of geometry, an already soft structure becomes even softer through a second spring core line, the surface loading of the sliding block remains different,

The object of the invention is to train and design the sliding element or the sliding block in such a way that that the supporting surface between the sliding element and the counter-bearing part despite the uneven distribution the forces to be transmitted receive an even load. The invention is characterized by this from that the support body and / or the inflation layer are dimensioned in their wall thicknesses so, that only as a function of Hook's law does an at least approximate uniform Adjusts area distribution.

Such a design of the sliding element or sliding block allows a constant surface pressure achieve over a wide range of stresses. The different materials are paired in geometrical form, and / was in unprevented tension State, whereby the materials adapt to the surfaces in such a way that they are as wide as possible or maximum basis, taking into account the different compression values in the materials absorbing the forces a structural design of the sliding element with regard to the contouring of the support layer and or the support body, which is made of steel, bronze. aluminum Od. The like. Can achieve an approximately uniform surface loading, which at grain point the elastic limit of the sliding material -, exceeds. There is no new spring characteristic that would otherwise be created by recesses, lugs. stool and the like. Is provided. Rather, the achievement of uniform pressure is achieved in an optimal way only through different geometric shapes of the mr mutual contact with each other coming body reached, automatically a correction in the touching surfaces to compensate for the transmission of forces over the entire surface of the sliding element is achieved.

Because js is cumbersome in many cases in terms of production or will be difficult, the mathematical ideal form practically carry out. one can rely on nutritional solutions first or second order skip if this is due to an error calculation lie within the elastic stress limit of sliding materials. You definitely get through the measure according to the invention an evenly 'vrc Distribution of the specific wing loading> over the entire wing of the gliding element, so that> a reduction in wear is guaranteed. the The service life of the sliding element is significantly increased. The deformation of the hard material, i.e. H. of Material of high strength of the carrier body is in the calculation for the formation of the surface design of the wing to be taken into account.

The invention is explained using several exemplary embodiments shown in the drawing.

Fig. 1 and 2 show the training in the scheme a known sliding block lriit the associated Diagram of the wing loading curve;

Fig. 3 and 4 illustrate the design values of the specific surface loading are not

* ° ψ ^e 'n ^e s trained according to the 3rd invention. Slidably detect, this will put the overlay layer over

StCmS ₁ in section and in the scheme with which the entire wing is stressed more evenly,

corresponding diagram of the wing loading; thereby a significant reduction in wear and tear

_ F i g, 5 and 6 represent another example of how increased durability is achieved,

formation emes sliding block according to the invention with additional F i g, 7 shows the longitudinal section through a sliding

corresponding diagram of the wing loading; element 14, dessert geometric shaping below

Fig. 7 illustrates a further embodiment taking into account the various Ε modules of all

example of a force and force involved in the load transfer designed according to the invention

Sliding element in longitudinal section, while Fis. 8 a * ° machine elements was calculated. Fig, S shows one

Figure 7 is a cross-section along the line Vm-Vni of FIG. Cross section through the sliding element 14 of FIG. 7,

In the known sliding block of FIG. 1, one is made up of the support body 15 and the upper one

Support 2 composed of a sliding material with even and lower support slats 16,17.

Layer thickness corresponding to a cylinder section These figures show that the corrective

intended. The counter bearing part is denoted by 3. 15 door of the geometric shape over length and

.3 ^ 5 ^{on the Trä} o ^he body 1 acting specific width of the sliding element must extend so that

Surface loading 4 is uniform over the entire area - a uniform distribution of the specific

moderate. F i g. 2 illustrates the curve 7 of the specific surface pressure; .

table wing loading of the wing 6, as it is The intended shape correction of the wing on the basis of optical stress examinations 20 can thus be determined by the geometric design alone results within the sliding material 2. The top of the overlay layer can be achieved. One can also Values at the edges can be used with the previously known shape correction of the wing only on the ten constructions, for example, five times the carrier body with a uniform layer thickness of the "Provide the value of the arithmetic surface overlay shown at 4. It is also possible to use compression molding accept. 25 correction for the achievement of an even spc-

The sliding block of FIG. 3 is with a specific surface loading over the entire base course 9 equipped on the carrier body 8, which has a surface both in the carrier body and in the over the surface corrected distribution of layers to lay on the support layer. Finally, the shape can be. The layer height is also reached in this way, for example, at the correction of the wing Edge zones are larger than in the middle of the cross section 30, that these are wholly or partially through the Raumdes Carrier body 8. Taking into account the design of the surface of the counter-bearing part different compression values to which the forces are applied.

The described measure can be carried out in the case of an approximately even distribution of the surface sliding element, in which several material pressures are achieved, as the diagram of the 35 materials with different E-modules are available, FIG. 4 shows. _a j _{s also} j, _e i such a sliding element or sliding

F1 g. 5 shows a sliding block, which on its lower block, in which the materials of the carrier body and

surface is provided with a support layer 12, the support layer have the same Ε-module,

which over the entire area in thickness a z. B. consist of the same material.

Correction according to the dimensions described

would have received. With even loading of the parts of the sliding element came in a computational way

Carrier body 11 through the forces 4 can be used or through practice, e.g. stress tests

Diagram 13 can be determined in accordance with the illustration of and the like. Here are the load

Fig. 6, in which the specific load conditions over the entire wing of the gliding

Distributed over the entire area almost as a constant 45 element, at least with regard to the main points

to address is essential differences in the determine.

1 sheet of drawings

Claims (1)

Claim: ^{! i} Gleiteleroentr, in particular sliding block, for the transmission of drive forces for translatory, rotary and oscillating movements in transmission elements such as couplings, articulated spindles and the like of machines, preferably drives, which is composed of a high-strength carrier and a support made of a softer bearing material, ip characterized in that the support body (8, 11, 15) and / or the supporting layer (9, 12, 16) are dimensioned in their wall thicknesses so that an at least approximately uniform surface load is only established depending on Hook's law.