| 张士强，李春书，戴俊，刘瑞林，张卫国.汽油机可变进气门相异升程机构研究[J].内燃机工程,2019,40(3):46-55. |
| Research on Variable Dissimilitude Lifts Mechanism of Intake Valves of a Gasoline Engine |
| DOI：10.13949/j.cnki.nrjgc.2019.03.007 |
| Key Words:four-valve gasoline engine variable dissimilitude lift of valves dissimilitude angle camshaft |
| Author Name | Affiliation | | ZHANG Shiqiang, LI Chunshu, DAI Jun, LIU Ruilin, ZHANG Weiguo | 1.School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
2.Department of Transportation and Vehicle Engineering, Tangshan University, Tangshan 063000, China
3.Department of Military Vehicle, Military Transportation University, Tianjin 300161, China |
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| Abstract:A mechanism scheme of the variable dissimilitude lifts(VDL) of intake valves was proposed, calculated and analyzed with the finite element analysis(FEA) for a four valve gasoline engine, which could produce and regulate in-cylinder swirl by adjusting the dissimilitude angle between two intake cams to change the difference between the lifts of two intake valves. The calculation results showed that the dissimilitude angle increased when the gear helix angle increased or/and the standard pitch circle radius decreased; the turning angles, turning torques and hydraulic balancing forces of the two intake cams were different when there was a dissimilitude angle, and the intake duration was getting longer with the increase of the dissimilitude angle. The FEA results show that the safety coefficient of the camshaft is 2.04, the maximum equivalent strain is 6.73×10-4 mm, the strength and stiffness conform to the requirements, and the resonance will not occur. A test of steady flow in cylinder confirms that VDL can obtain a large scale swirl and the intake flow almost remain constant; the swirl intensity can reach 0.24 when the dissimilitude angle is 8°, the deviation of the average flow coefficient is only 0.93%, and the tumble intensity slightly increases with the increase of the dissimilitude angle. The results of performance tests of the gasoline engine with VDL show that an appropriate dissimilitude angle can make the torque at middle low speeds increase by 2.94% and the power at high speeds by 3.03%. |
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