DE102014013963A1 - Reciprocating internal combustion engine with eccentric disc and variable compression - Google Patents

Abstract

Reciprocating internal combustion engine (1) with at least one cylinder, characterized in that the connecting rod bearing (3) the radial groove (7), the end stops (20, 21) and thus positively or positively connected abutment (30) with liquid sealing function relative to the eccentric disc (15), and in that the eccentric disc (15) rotating therein, which surrounds the crank pin (9) in a form-fitting manner, has the flow connections (5, 6) which make the pressure chambers (22, 23) liquid-tight by the long piston (4) are separated, independently of each other with positive or negative pressures on the annular grooves (11, 12) and thus in flow communication flow connections (13, 16) acted upon by hydraulic oil, so that the eccentric disc (15) an angle <=> 350 ° up to the respective end stops (20, 21) passes through.

Description

The invention relates to a reciprocating internal combustion engine, in particular for a motor vehicle, with at least one cylinder with operating continuously variable compression ratio according to the type specified in the preamble of claim 1.

Reciprocating internal combustion engine variable compression ratio engines are known in various technologies and embodiments.

However, the state-of-the-art variable compression ratio reciprocating internal combustion engines have not been widely adopted because of their mechanical complexity, engine weight, tightness, noise, and associated susceptibility and cost, although providing different compression ratios under varying engine operating conditions An improvement in the quality of the exhaust gas, an increase in efficiency and in the high load range also avoiding engine knocking is given.

So in the publication DE 4226361 C2 discloses a hydraulically adjustable eccentric for variable compression, the eccentric to the right / left control can only be realized by consuming and mechanically vulnerable valve controls with the necessary additional flow connections.

The invention is therefore the object of providing a device with operating variable variable compression ratio for reciprocating internal combustion engines, which is to be realized by a simple and inexpensive technology with a long service life. According to the invention, this object is achieved in that a hydraulically adjustable eccentric disk is placed around the crank pin, which displaces the piston of the internal combustion engine in the cylinder housing via a connecting rod bearing positively or positively connected to the connecting rod, so that a variable compression is given.

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

1 a simplified sectional view of the reciprocating internal combustion engine ( 1 ), wherein the eccentric disc ( 15 ) with the long piston ( 4 ), the guide ring ( 14 ), the annular grooves ( 11 . 12 ) and the flow connections ( 5 . 6 ) the crankpin ( 9 ) with the flow connections ( 13 . 16 ,) and the flow connections ( 8th . 10 ) frictionally encloses and the connecting rod bearing ( 3 ) to 2 the end stops ( 20 . 21 ) with the abutment ( 30 ) having. The pressure chambers ( 22 . 23 ) can be separated, ie with different positive and negative pressures, via the ring groove ( 11 . 12 ) and the flow connections ( 5 . 6 ) are controlled with hydraulic oil. The end stops ( 20 . 21 ) prevent closing of the flow connections ( 5 . 6 ) in the respective end position.

2 a simplified side view of the 1 ,

LIST OF REFERENCE NUMBERS

1

reciprocating internal combustion engine

2

connecting rod

3

connecting rod bearing

4

long piston

5

flow connection

6

flow connection

7

radial groove

8th

flow connection

9

crank pin

10

flow connection

11

ring groove

12

ring groove

13

flow connection

14

guide ring

15

eccentric

20

end stop

21

end stop

22

pressure chamber

23

pressure chamber

30

abutment

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4226361 C2 [0004]

Claims (1)

Reciprocating internal combustion engine ( 1 ) with at least one cylinder, characterized in that the connecting rod bearing ( 3 ) the radial groove ( 7 ), the end stops ( 20 . 21 ) and the thus positively or positively connected abutment ( 30 ) with liquid sealing function against the eccentric disc ( 15 ), and in that the eccentric disc rotating therein ( 15 ), the crank pin ( 9 ) encloses form-fitting, the flow connections ( 5 . 6 ), the pressure chambers ( 22 . 23 ), through the long piston ( 4 ) are separated liquid-tightly, independently of each other with positive or negative pressures via the annular grooves ( 11 . 12 ) and the flow connections ( 13 . 16 ) supplied with hydraulic oil, so that the eccentric disc ( 15 ) an angle <=> 350 ° up to the respective end stops ( 20 . 21 ) passes through.

Images