Arrangement for controlling the oil feed to a control chamber of a piston with variable compression height

US4784093A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Viktor Pfeffer · Esslingen am Neckar, DE
• Friedrich Wirbeleit · Eßlingen, DE

Key dates

• Filing date: Nov 9, 1987
• Grant date: Nov 15, 1988
• Expiry date: Nov 9, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B75/044
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a piston with variable compression height, particularly for internal-combustion engines, that consists of an interior piston part to which a connecting rod is coupled, and an exterior piston part that is slidably held at said interior piston part. In this case, the exterior piston, via two control chambers that are supplied with oil from the lubricating oil circuit, supports itself by adherence at the interior piston part, said control chambers being connected by a hydraulic system. In order to, in the process, keep the pressure in the oil feed to one control chamber approximately constant over the whole rotational speed range of the internal-combustion engine, the control chamber is connected to the lubricating oil circuit by means of a non-rotating control oil groove in the connecting rod bearing only in an indicated crank angle range, and/or the oil-carrying grooves and bores in the piston and in the connecting rod are coordinated with one another with respect to their cross-sections.