CS229539B1 - Self-adjusting connecting rod of combustion engine - Google Patents

Abstract

The self-adjusting connecting rod of a piston combustion engine, for gasoline and diesel engines, solves the automatic change of the compression ratio by changing the length, depending on the retraction, or by circulating pressure side. It consists of a connecting rod head, on which a sleeve is attached, in the lower part of which there is an oval cavity filled with a viscoelastic substance. In the case there is a shaft, which has an eye for the piston pin at one end and protrusions at the other end, the end with the protrusions extends into the oval cavity. In the stem, there is a piston pushing out a viscoelastic substance due to the pressure of the gas filling or the force of a mechanical spring. The self-adjusting connecting rod can also be used with compressors for automatic regulation of output pressure.

Description

BACKGROUND OF THE INVENTION The present invention relates to a self-ventilator & junction rod of a piston combustion engine providing a self-acting change in compression ratio depending on the thermal circulation parameters.

The variable compression ratio of the gasoline engine allows for a substantial increase in thermal efficiency in the area of partial loads in which such an engine usually works. For diesel engines, compression and combustion pressures can be reduced to a maximum. Many ways of automatically changing the compression ratio are known, but have only rarely been used because they usually mean too complicated the design or deterioration of some engine parameters, for example due to the weight of the sliders.

The above-mentioned drawbacks are solved by a self-adjusting connecting rod, the essence of which is that in the housing connected to the connecting rod head there is an oval cavity in the lower part of the rod, into which the shaft of the stem extends and the viscoelastic substance is filled, with the piston above which the filling is compressed gas. The advantage of the connecting rod according to the invention is that it adjusts the compression ratio continuously, depending on the streic pressure of the circulation. The production is filled with viscous, resp. viscoelastic agent. The spring may be mechanical or pneumatic, which is more preferred by weight. The characteristics of the connecting rod depend on the spring, the properties of the filling, the cross section of the cavity, the surfaces of the protrusions, and so on; and is selected to be optimal for each engine mode the exact ratio. Because the piston forces are transmitted through the viscoelastic material, the noise and stress of the crank mechanism is reduced.

Claims (3)

OBJECT A self-adjusting connecting rod of a rear-end engine, characterized in that in the housing (4) connected to the connecting rod head (1, 2), an oval cavity (6) is formed in which the end of the shaft (5) extends with projections (7), and is filled with a viscoelastic agent, wherein a plunger (8) is arranged in the shank (5) over which there is a compressed gas charge in the cavity (11). In addition to internal combustion engines, the connecting rod can be applied to compressors where the pressure drop is automatically reduced when pressure is applied. The figure shows an example of a self-adjusting gas spring connecting rod construction. The connecting rod consists of a connecting rod head 1, 2 on which a sleeve 4 is attached by screws 3, in which a shank 5 is slidably mounted. In the lower part of the housing 4 there is an oval cavity 6 and a portion with projections 7 is attached to the end of the stem 5; or the protrusions of the thyroid one with the stem 5. In the stem 5, the plunger 8 is extruding a viscous, respectively. a viscoelastic, e.g., silicone polymer, from the shank to the cavity 6. The seal 9 prevents leakage of the charge and the nozzle 10 provides flow throttling. In the cavity 11 there is a compressed gas charge or vapor, the volume of the cavity can be reduced in accordance with the desired characteristic by inserting a body of lightweight material e.g. The filling of the gas can be effected by the filling valve 12, or the housing 14 and the like are pressed into the eye 13 after the gas has been pressed. In order to make the shank 5 together with the lugs 7 and the perch 13, the sheath 4 may be divided by a plane perpendicular to the connecting rod bearing axis and connected, for example, by rivets. In this case, the housing 4 may form one unit with half of the head 1, or with the entire head 1, 2 of the non-split connecting rod head. Also, a uneohanic spring whose force does not depend so much on the temperature can be used to extrude the substance from the stem 5 by the piston 8. However, the connecting rod realized in this way has a higher weight and demands greater pressure on the piston seal 2. Connecting rod according to claim 1, characterized in that a mechanical spring is provided in the cavity (11). Connecting rod according to clauses 1 and 2, characterized in that the housing (4) forms with the upper part of the connecting rod head (1) one unit divided by a plane perpendicular to the connecting rod bearing axis. 1 sheet of drawings 229539 3