Exhaust valve driving mechanism and exhaust valve

Abstract

The invention belongs to the technical field of diesel engines, and discloses an exhaust valve driving mechanism and an exhaust valve. The driving mechanism comprises a driving housing, an outer piston, an inner piston, a valve rod, a hydraulic block and an electromagnetic valve, wherein a first through hole penetrates through the middle part of the driving housing, and an oil return hole and a first throttling plug screw which communicate with the first through hole are formed in the side wall of the driving housing; the outer piston is arranged in the first through hole in a sliding mode, achannel is formed in the outer piston; an oil hole and an oil discharging hole are formed in the outer piston and communicate with the channel, and the oil discharging hole can communicate with the first throttling plug screw; the inner piston is arranged in the channel in a sliding mode, and one end of the inner piston can extend out of the bottom of the channel; the valve rod is fixedly connected to one end of the inner piston and extends out of the channel; a resetting component is arranged on the valve rod; the hydraulic block is fixedly arranged on the driving housing and provided with asecond through hole; one end of the second through hole communicates with the first through hole; and the electromagnetic valve is arranged on the hydraulic block and communicates with the other end of the second through hole. The driving mechanism is simple and reliable in pressurization mode, quick to open and close the exhaust valve, and good in buffering effect on mechanical impact parts.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to an exhaust valve driving mechanism and an exhaust valve. Background technique [0002] The exhaust valve of a diesel engine and its control driving system are one of the core components of a diesel engine, and its driving characteristics will directly affect the economy and emission of the engine. The traditional exhaust valve system generally includes two parts: the exhaust valve control unit and the exhaust valve actuator. The servo oil is pressurized in the exhaust valve control unit to the required driving pressure, and enters the exhaust valve actuator through the high-pressure oil pipe, and then Drive the exhaust valve to work. This method has a large pressure loss, involves many parts and requires precise matching between the two parts of the mechanism. Moreover, the exhaust valve needs to meet the requirements of fast response in the opening and closing process du...

AI Technical Summary

Problems solved by technology

The traditional exhaust valve system generally includes two parts: the exhaust valve control unit and the exhaust valve actuator. The servo oil is pressurized in the exhaust valve control unit to the required driving pressure, and enters the exhaust valve actuator through the high-pressure oil pipe, and then Drive the exhaust valve to work. This method has a large pressure loss, involves many parts and requires precise matching between the two parts.

Moreover, the exhaust valve needs to meet the requirements of fast response in the opening and closing process during work. In the initial stage and the end stage of the exhaust valve opening and closing process, the cushioning effect of all mechanical impact parts is not good, and the parts are easily damaged.

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