Connecting rod with two-stage-adjustable length

Abstract

The invention relates to a connecting rod with the two-stage-adjustable length. The connecting rod comprises a large connecting rod head (1) and a small connecting rod head (3) and is characterized by further comprising a variable-length rod body (2), wherein one end of the variable-length rod body (2) is connected with the large connecting rod head (1), and the other end of the variable-length rod body (2) is connected with the small connecting rod head (3); the variable-length rod body (2) comprises a cavity (21) and a valve rod (22) which are connected with each other in an inserted manner, a connecting head at the bottom end of the cavity (21) is connected with one end of the large connecting rod head (1), and the bottom of the cavity (21) communicates with an oil duct hole at a crankshaft connecting hole in the large connecting rod head (1) by the aid of a main oil duct (24); and a connecting head at the other end of the valve rod (22) is connected with the small connecting rod head (3), and a spring (23) is arranged between the valve rod (22) and the connecting head of the valve rod (22). A self-locking mechanism (26) is further arranged between the cavity wall of the cavity (21) and the valve rod (22). Engine oil pressure control is adopted, and two-stage length adjustment of the connecting rod is realized by the aid of different oil pressures.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to a two-stage length-adjustable connecting rod. Background technique [0002] Due to increasingly stringent laws and regulations, the requirements for engine fuel consumption and emissions are getting higher and higher, and the compression ratio of gasoline engines is getting higher and higher. However, with the increase of engine compression ratio, the tendency of engine knocking at full load will increase. Engine power is reduced accordingly. The variable compression ratio engine can effectively solve this problem. The engine adopts a high compression ratio at partial load to improve engine thermal efficiency and reduce engine fuel consumption. At full load, a small compression ratio is used to improve engine anti-knock performance and increase engine power. sex. [0003] At present, most of the engine connecting rods are integral structures, and the conn...

AI Technical Summary

Problems solved by technology

Integral connecting rod, the length of the connecting rod is not variable, the structure is simple, and the performance is reliable, but only one compression ratio can be realized; the connecting rod shaft is designed as a plunger structure, which has a complicated structure, and the connecting rod shaft becomes a plunger type structure, the connecting rod shaft is difficult to pass the engine reliability test, and is prone to fatigue damage

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