A hydraulic stepless variable valve mechanism based on split rocker arm
A valve train, variable technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as short cost and life, and achieve the effects of convenient operation, simple control, and volume change
Active Publication Date: 2019-03-22
TIANJIN UNIV
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Problems solved by technology
[0004] In view of the above-mentioned prior art, in order to solve the problem of the cost and short life of the high-speed solenoid valve, the present invention provides a split rocker arm hydraulic stepless variable valve mechanism. The present invention is based on cam drive, by controlling the relative Position, change valve timing and lift, fast response, no need for solenoid valve to control oil supply, high reliability, simple structure
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[0018] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.
[0019] A split rocker arm hydraulic stepless variable valve mechanism proposed by the present invention, such as figure 1 As shown, it includes the engine valve assembly, the cam 1 and the valve push rod 2 driven by the cam, the first rocker arm 3 and the second rocker arm 5 and the timing and lift are adjusted by connecting the first rocker arm 3 and the second rocker arm 5 The intermediate shaft 4; the valve assembly includes valve 7 and valve spring 6. When the engine is working, the cam 1 rotates to push the valve push rod 2, and then pushes the first rocker arm 3 to rotate around the intermediate shaft 4, and then drives the second rocker arm 5 to rotate, thus overcom...
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The invention discloses a split rocker arm hydraulic stepless variable valve mechanism, which includes an engine valve assembly, a cam, a valve ejector rod, first and second rocker arms, and a device connected to the first and second rocker arms to adjust timing and lift The intermediate shaft part; there is a boss with a certain radian in the middle of the first rocker arm, which matches with the protruding body of the second rocker arm, and is connected together through the intermediate shaft to form a sealed main cavity. The surface of the intermediate shaft part has The arc-shaped groove for oil inlet and the arc-shaped groove for oil outlet can continuously supply and discharge oil to the main cavity. When the cam rotates, it drives the first rocker arm to rotate, and the first rocker arm passes through the cavity to seal The hydraulic oil drives the second rocker arm to rotate, thereby opening the valve, and adjusting the position of the intermediate shaft through rotation, so that the position of the arc groove for oil inlet and the arc groove for oil outlet relative to the edge of the main cavity body changes, changing Finally, the volume of the main cavity is formed, and finally the opening time and angle of the valve can be changed, and the control is simple and the operation is convenient.
Description
technical field [0001] The invention relates to an engine stepless variable valve hydraulic actuator. Background technique [0002] The internal combustion engine is still the prime mover with the highest thermal efficiency and the largest power per unit volume and unit weight. It is widely used. However, with the gradual shortage of energy in the world and the continuous deterioration of environmental resources, we need internal combustion engines to meet stricter emission regulations. Traditional internal combustion engines use fixed-profile camshafts to drive valves, which makes the emissions and fuel consumption of internal combustion engines not optimal at all operating points. Therefore, most new internal combustion engines use variable valve technology to control emissions and reduce fuel consumption. [0003] At present, variable valve technology is mainly divided into camshaft-based variable gas distribution technology and camless gas distribution technology. The f...
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IPC IPC(8): F01L1/18F01L9/02F01L1/46
CPCF01L1/18F01L1/46F01L9/14
Inventor 尧命发陈鹏张翔宇
Owner TIANJIN UNIV