Air intake/exhaust valve lift-variable system in air intake pressure regulating type

Abstract

The invention discloses an air intake/exhaust valve lift-variable system in an air intake pressure regulating type, belonging to the technical field of internal combustion engines. The system comprises an air intake channel, an air exhaust channel, an air intake valve lower section, an air exhaust valve, an air intake valve upper section, a capacity cavity, a movable body, a perforation pipe, a movable block, an air inlet pipe, a connecting pipe and a spring, wherein the movable body is mounted in the capacity cavity and is contacted with the inner wall face of the capacity cavity in a sealing manner; the perforation pipe perforates the upper wall face and the lower wall face of the movable body; the movable block is mounted in the perforation pipe and is contacted with the inner wall face of the perforation pipe in a sealing manner; the lower end face of the movable block is a plane; the upper end face of the movable block is an inclined face; the air intake valve upper section passes through the upper wall face of the capacity cavity and is extended into the perforation pipe; the lower end face of the air intake door upper section is contacted with the upper end face of the movable block in a sealing manner; when pressure in the air intake pipe is relatively large, the movable body is moved to right; the air intake valve lift is increased; when the pressure in the air intake pipe is relatively small, the movable body is moved to left; the air intake valve lift is reduced; and the intake/exhaust valve variable-lift system is characterized by reasonable design and simple structure and is suitable for engine valve lift-variable systems.

Description

technical field [0001] The invention relates to an engine intake and exhaust system in the technical field of internal combustion engines, in particular to an intake pressure adjustable intake and exhaust valve lift variable system. Background technique [0002] The valve lift of the traditional gasoline engine is fixed and invariable, that is, there is only one cam profile of the camshaft, which makes it impossible for the lift to make the engine respond well in both high-speed and low-speed areas. The valve lift or cam profile design of a traditional gasoline engine is a balanced choice for the engine under all operating conditions. As a result, the engine can neither get the best high-speed efficiency nor the best low-speed torque, but it can get The most balanced performance under all working conditions. The adoption of variable valve lift enables the engine to obtain the required valve lift in both high-speed and low-speed areas, thereby improving the high-speed power ...

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Problems solved by technology

However, its design is to use a hydraulic mechanism, which requires high sealing performance. If the sealing is not tight, it will easily c

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