DE3332654A1 - METHOD FOR REDUCING THE ENERGY CONSUMPTION OF BEARING BEARING BEARINGS - Google Patents

Description

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description

The invention relates to a method for reducing energy consumption of bearings provided with bearing bushes - of machines, in particular internal combustion engines.

It is well known that the work of frictional forces that converts into heat reduces the efficiency of mechanical machines, especially in the camps. The bearings are generally provided with bushings, where the connection between various mutually rotatable organs takes place.

But now it is possible to use the bearing bushes on their Support surface vertical recorded over time Calculate or measure forces in terms of direction and intensity. These forces can be a substantially constant or have cyclical intensity.

One can therefore for each radial direction, based on a given origin, the one received by the bearing or by the bearing bush calculate or measure maximum force.

The invention consists in modifying the surface area of the bearing surface of the bearing or the bearing bush, in particular the Area of its anti-friction coating in relation to the maximum that can be absorbed in a given radial direction Force.

For practical reasons, of course, the surface area is changed by modifying the width of the friction lining. This width is approximated by means of fixed widths to the values calculated from the and measured forces are derived. These fixed widths correspond to the maximum calculated or measured for each zone Broad.

In addition, the width transitions between the different Zones with a slope of generally 30 to 60 °, preferably close to 45 °.

In many practical cases the main forces act either in a preferred single direction or in two diametrically opposite preferred directions. In this case, a single reduction in the width of the bearings can be sufficient. The width reduction of the bearing or the anti-friction lining can be achieved by any known machining device, in particular äürch milling, can be achieved.

The following examples explain the invention for the case of a connecting rod bearing (FIG. 2) and a shaft bearing of a crankshaft an internal combustion engine (Fig. 3). Fig. 1 shows part 1 of the carrier of the bearing bush.

Fig. 1 shows the part 1, the support of the bearing bushing. The anti-friction lining 2 of an initial and uniform width L is laterally machined in zone 3 in such a way that it has a reduced width 1 in this zone. This is shown by the corresponding radial cuts at points A, B or C. The transition between the zones with widths L and 1 is about 45 °.

example 1

Fig. 2 shows a connecting rod with a bearing bush according to the invention. The diameter of the shaft is 50 mm. The outside diameter the bearing bush is 54 mm. The anti-friction coating has a thickness of 0.25 mm and the following composition in percent by weight:

Sn: 20%
Cu: 1%
Al: rest.

The initial width is 20 mm and has recesses 3, the width of which is reduced to 11 m, the transition

■ - ' - ^: ■ "- ■' - ^: - 3 3 3 2 6 5 A

- 5 zones enclose an angle of 30 ° with respect to the axis of rotation.

The ends of these different zones are, starting from the joint plane 4: 23 °, 150 °, 240 ° and 315 °. The direction of rotation the shaft is indicated by the arrow F.

The calculation shows that for a bearing with a uniform width the energy consumption, which at full load was 305 W, at the bearing bushing described above has reached 268 W This is a reduction of 37 W, which is a relative value of 12% represents. This represents an energy saving of 665 kJ / connecting rod during the life of the internal combustion engine.

Example 2

A crankshaft bearing for internal combustion engines is provided with a bearing bush. The inner diameter is 54 mm, the Outside diameter 58 mm and the width 21 mm. The width was of the same type as in Example 1, the useful width being in the upper zone between -20 ° and +20 ° compared to butt joint level 4 was reduced to 12 mm. The transition between these two zones took place with a bevel at 45 °.

With an energy consumption of 370 W per bearing for a conventional one For bearings with the same dimensions, the energy saving is 55 W per bearing, which is around 1060 kJ / bearing during the service life of the internal combustion engine. The energy saving achieved thus has a relative value in the order of magnitude of 15%.

The tests carried out under the conditions of Examples 1 and 2 were satisfactory.

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Claims (4)

Patent Attorneys -.-._- .:: ..:. "'- r BEETZ ύ PARTNER ■" J O J Z OO4 SteinsdorfstMO, 8000 Munich 22 503-35.3O6P September 9, 1983 SOCIETE INDUSTRIELLE DES COÜSSINETS S.I.C. 12, rue General Foy 75008 Paris (France) Method for reducing the energy consumption of bushed bearings. Claims 1. Method of reducing the energy consumption of mit Bearings provided with bushings, g e k e η: ·> η draws - by modifying the surface area of the friction surface of the bearing bushes at each point depending on the im Vertical maximum force exerted during operation. 2. The method according to claim 1,
characterized, - That the modification of the surface area by changing the width (L, 1) of the contact surface of the anti-friction coating he follows. 3. The method according to claim 1 or 2,
characterized, - That the changes in width take place in zones of the same type. 503-BR 2347 4. The method according to any one of claims 1 to 3, characterized in that - That the zones with different widths progressively connected to one another by bevels extending from 30 to 60 ° are.