DE102012009636A1 - Piston arrangement for e.g. lifting cylinder internal combustion engine, has piston washers provided in sliding contact with cylinder raceway, radially displaceable with respect to each other and actuatedly connected with spring element - Google Patents

Abstract

The arrangement has piston washers (15) provided in sliding contact with a cylinder raceway (4) and/or comprising reciprocally radial or punctiform oil-absorptive element. The washers exhibit same or different intensities. The washers are radially displaceable with respect to each other. The washers are pre-tensioned over a counter bearing (16) and actuatedly connected with a spring element (9). A piston (12) is actuatedly connected with the spring element. The piston comprises oil inlet apertures (7) and oil outflow holes (13).

Description

The invention relates to an arrangement for reducing the tendency to tilt of internal combustion piston according to the type specified in the preamble of claim 1.

Due to operational forces acting on the cylinder crankcase, the cylinder experiences cylinder distortion, resulting in undesirable deformation of the otherwise cylindrical shaped cylinder liners. As a result, deformations to the gap formation between the outer circumference of the piston rings and the cylinder liners are possible, so that in extreme cases combustion gases from the combustion chamber can penetrate as blow-by gases into the crankcase. In particular, by the tilting tendency of pistons, these undesirable phenomena are exacerbated and lead to premature wear of the piston and cylinder and increased fuel consumption.

In order to counteract the above-mentioned phenomena, different technologies exist in the prior art in pistons and piston rings of reciprocating internal combustion engines and are also known and used in various embodiments.

The invention is therefore an object of the invention to provide an arrangement which reduces the tendency to tilt of pistons of internal combustion engines.

This object is achieved in that the piston in addition to the known piston rings surrounds a number of axially biased mutually displaceable piston discs whose inner radii are non-positively connected via a spring element to the piston, so that the individual discs can follow the cylinder deformation better and thereby the tilt tendency with their disadvantages is reduced.

Advantageous developments of the invention are characterized by the specified in the preamble of claim 1 type of this claim dependent claims.

In the following the invention will be described with reference to a preferred embodiment in conjunction with two drawings. Showing:

1 a simplified sectional drawing of the internal combustion engine ( 1 ) with the piston ( 12 )

2 the section A of 1 ,

According to the invention, a higher flexibility of the piston wall for better adaptation to the ovality of the cylinder cross-section during driving and a reduction in the tendency of tilting of the piston ( 12 ) with a greater impermeability to the cylinder liner ( 4 ) can be achieved. For this purpose, the piston ( 12 ) in addition to the conventional piston rings ( 5 ) over the abutment ( 16 ) biased to each other and radially displaceable piston discs ( 15 ), with their inner radii frictionally with the monolithic or split spring element ( 9 ), the piston ( 12 ) also frictionally with the spring element ( 9 ) connected is. The spring element ( 9 ) has a waveform in a first embodiment and is relatively stiff and provided with as many waves as possible, so that the large forces acting on it can be absorbed without its excessive deformation. To ensure reliable lubrication of the piston discs ( 15 ), the engine cooling oil can passively or actively via the oil inlet openings ( 7 ) through the spring outer region ( 10 ) and the spring interior ( 11 ) of the spring element ( 9 ), the piston discs ( 15 ) one and / or two-sided punctiform, continuous or opposite the cylinder liner ( 4 ) have closed radial Hohnungen to accommodate enough lubricating oil can. About the oil drain holes ( 13 ), the engine oil can flow back into the oil circuit.

LIST OF REFERENCE NUMBERS

1

Internal combustion engine

2

cylinder

3

cylinder filling

4

Cylinder liner

5

piston rings

6

piston crown

7

Oil inlet opening

8th

piston pin

 9

spring element

10

Spring outdoor

11

Spring indoors

12

piston

13

Oil drain opening

14

pleuel

15

piston discs

16

abutment

Claims (5)

Arrangement for pistons of reciprocating internal combustion engines, reciprocating compressors and reciprocating pumps, characterized in that the piston crown ( 6 ) of the internal combustion engine ( 1 ) the piston ( 12 ) with the conventional piston rings ( 5 ) and the equally strong or differently strong piston discs ( 15 ) with the cylinder liner ( 4 ) are in sliding contact and / or on one or both sides have radial or punctiform oil-receptive Hohnungen and radially to each other are displaceable and over the abutment ( 16 ) and frictionally engaged with the spring element ( 9 ), wherein the piston ( 12 ) also with the spring element ( 9 ) is non-positively connected, and that the piston ( 12 ) the oil inlet openings ( 7 ) and the oil drain holes ( 13 ) having. Piston according to claim 1, characterized in that the piston ( 12 ) in the area of the piston rings ( 5 ) also the piston discs ( 15 ) has in the conventional piston rings ( 5 ) are integrated. Piston according to claim 1 and 2, characterized in that the spring element ( 9 ) is monolithic or physically divided and made of the same or different materials having the same or different moduli of elasticity. Piston according to one of claims 1 and 3, characterized in that the piston discs ( 15 ) directly frictionally with the piston ( 12 ) and have an integral spring element. Piston according to one of claims 1 and 4, characterized in that the piston discs ( 15 ) directly frictionally with the piston ( 12 ), wherein the piston ( 12 ) has integral spring elements.

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