A variable compression ratio device for an internal combustion engine with a self-locking structure

Abstract

The invention discloses an internal combustion engine variable compression ratio device provided with a self-locking structure. The device comprises a connecting rod located on an internal combustion engine, an eccentric sleeve and a reset spring. One end of the connecting rod is connected with a crankshaft of the internal combustion engine, a cavity is formed in the other end of the connecting rod, the eccentric sleeve is arranged in the cavity in an inserted mode, one end of the rest spring is fixed to the connecting rod, the other end of the reset spring is fixed to the eccentric sleeve, a piston pin on the internal combustion engine is sleeved with the eccentric sleeve, the eccentric sleeve can rotate along with the piston pin, and the center axis of the eccentric sleeve and the center axis of the piston pin are staggered. Under the action of centrifugal force, the eccentric sleeve rotates around the piston pin, so that the center distance between the small end and the large end of the connecting rod is changed, and stroke adjustment of the connecting rod is achieved, namely compression ratio adjustment is achieved. Due to reasonable arrangement of the rotation center of the eccentric sleeve and the center of the small end of the connecting rod, the device has a self-locking function. When self-locking conditions are met, the eccentric sleeve and the connecting rod swing synchronously, and self-locking is achieved.

Description

technical field [0001] The invention relates to a variable compression ratio device for an internal combustion engine, in particular to a variable compression ratio device for an internal combustion engine with a self-locking structure. Background technique [0002] The change of the center distance between the large and small ends of the connecting rod of the internal combustion engine will lead to the compression ratio of the internal combustion engine. The compression ratio of the internal combustion engine directly affects the pressure of the mixture in the cylinder of the internal combustion engine, affects the combustion explosion pressure of the mixture, affects the combustion speed, and then affects the power, emission performance and economy of the internal combustion engine. sex. [0003] At present, there are reports on mechanisms that can adjust the compression ratio variable through the stroke of the connecting rod, such as a device with a patent name of variabl...

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Problems solved by technology

[0006] The design mechanisms of the above patents all require auxiliary links or drivers to ensure that the stroke of the main link can be adjusted, and the supporting systems and control mechanisms are complicated.

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