Title:
CONTROL SYSTEM AND NON-RETURN VALVE FOR ARRANGEMENT IN SUCH A CONTROL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/194050
Kind Code:
A3
Abstract:
The invention relates to a control system for actuating two control pistons (14 and 15), which interact with an adjusting element, for a device for changing the compression ratio of a cylinder unit of a reciprocating-piston internal combustion engine. The adjusting element is arranged in a connecting-rod eye of a connecting rod and can be adjusted between two different positions, in which the control pistons (14 and 15), which are guided in supporting cylinders (19 and 20), are in a retracted or extended position. In this case, the associated pressure chambers (21 and 22) are connected to a switching device, so that one of the two oil lines (24, 25) can be selectively relieved of pressure by means of the switching device. The switching device comprises a directional control valve (29) which controls both control pistons (14 and 15), and a control slide of the directional control valve (29) is displaced into its two switching positions and held in them via a fluid line (26) originating from the connecting rod bearing (23) exclusively by at least two different control pressures in the interaction with a return spring (37).
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Inventors:
NENDEL ANDREAS (DE)
POPP MARKUS (DE)
KNORR MICHAEL (DE)
POPP MARKUS (DE)
KNORR MICHAEL (DE)
Application Number:
PCT/DE2017/100362
Publication Date:
January 04, 2018
Filing Date:
May 02, 2017
Export Citation:
Assignee:
SCHAEFFLER TECHNOLOGIES AG (DE)
International Classes:
F02B75/04; F16K11/07; F16K15/04
Foreign References:
| DE102014220175A1 | 2016-04-07 | |||
| DE102013206513A1 | 2014-10-16 | |||
| DE102013210494A1 | 2014-12-11 | |||
| EP2821619A1 | 2015-01-07 | |||
| DE102013105391A1 | 2014-11-27 | |||
| DE102012112481A1 | 2014-06-18 | |||
| DE102013021065A1 | 2015-06-18 |
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