Change-over valve for controlling hydraulic liquid flow and variable compression ratio internal combustion engine connecting rod with same

Abstract

The invention relates to a change-over valve for controlling a hydraulic fluid flow, in particular a hydraulic fluid flow of a control connecting rod, having a valve body in which an axially movable tap element is arranged, which tap element can be selectively moved into a first switching position or a second switching position. At least two through-holes are provided in the tapping element, saidthrough-holes extending through the tapping element. In the first switching position, a fluid connection between the first hydraulic connection and the supply connection is produced by one of the through-holes, and in the second switching position, a fluid connection between the second hydraulic connection and the supply connection is produced by the other of the through-holes. According to the invention, at least one throttle device is provided, by means of which a hydraulic preload of the hydraulic fluid can be generated in one of the switching positions when used as intended. A throttle device is associated with the tap element, and the throttle device is deactivated in a further switching position of the switching positions.

Description

technical field [0001] The invention relates to a switching valve for controlling the flow of a hydraulic fluid, in particular for a connecting rod of an internal combustion engine with a variable compression ratio, the connecting rod having an eccentric adjustment device for adjusting the effective connecting rod length . The invention also relates to a connecting rod with such a switching valve. Background technique [0002] In internal combustion engines, a high compression ratio has a positive effect on the operating efficiency of the internal combustion engine. Compression ratio is generally understood as the ratio of the entire cylinder volume before compression to the remaining cylinder volume after compression. However, in externally ignited internal combustion engines, especially gasoline motors with a fixed compression ratio, it is only permissible to select the compression ratio so high that so-called “knocking” of the internal combustion engine is avoided durin...

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Problems solved by technology

However, when the angle changes on the eccentric, or the set of lever members, the corresponding supporting piston hits the chamber bottom of the cylinder when resetting, which can negatively affect the service life

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