Motor intake manifold
An intake manifold and engine technology, applied in engine components, machines/engines, mechanical equipment, etc., can solve the problems of flow resistance loss, affect engine performance, reduce engine charge coefficient, etc., and achieve reduced flow resistance and simple structure. , the effect of maintaining mechanical energy
Inactive Publication Date: 2010-03-10
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology
[0004] Referring to the figure, the design of the intake manifold is often designed so that the bent intake pipe is connected to the resonant cavity due to space constraints, while the angle α between the center line of the traditional intake manifold pipe and the connection of the resonant cavity is too large, Generally, it is greater than 110°, and the connection between the intake pipe and the resonant cavity is generally a straight pipe with no change in diameter. These structures make the gas in the intake manifold encounter local resistance at the connection between the pipe and the resonant cavity, causing the pipeline The gas at the connection with the resonant cavity generates flow separation, resulting in a large loss of flow resistance, which reduces the charge coefficient of the engine and further affects the performance of the engine
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[0011] see figure 2 , the present invention includes a resonant cavity 1 and a bent intake pipe 2, and the two parts communicate with each other. The joint 21 between the inlet pipe 2 and the resonant cavity 1 is a typical shrinking nozzle. From the knowledge of fluid mechanics, it can be known that this structure is the one with the smallest local resistance loss coefficient among the inlet types on various containers. At the same time, it is necessary to keep the intersecting angle α' between the centerline of the intake pipe 2 and the plane of the resonant cavity 1's pipe interface within 90°±10°, so as to prevent the angle between the airflow direction and the centerline of the intake pipe from being too large. This results in flow separation when the airflow is high-speed, increases local resistance loss, and dissipates the mechanical energy of the airflow, thereby affecting the charge coefficient and reducing the performance of the engine.
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The invention discloses an intake manifold with low flow resistance. The whole intake manifold comprises a bent pipeline part and a resonant cavity; the two parts are mutually communicated; and a smoothly transitional contracting jet nozzle is formed at the joint of an intake pipe and the resonant cavity. The plane where the center line of the intake pipeline is positioned and the plane where thepipeline connection part of the resonant cavity is positioned intersect with each other and form an angle of Alpha which is within 90 degrees plus or minus 10 degrees; and the two planes are near-vertical. The motor intake manifold can reduce the flow resistance of gas and keep the mechanical energy of gas flow, thereby guaranteeing the volumetric coefficient, and improving the performances of themotor. In addition, the motor intake manifold has simple structure, thus being convenient for being formed by utilizing the existing forming technique, and having low manufacture cost.
Description
technical field [0001] The invention relates to the technical field of automobile engine intake manifolds. Background technique [0002] The current design of the intake manifold of the automobile engine is generally to determine the diameter and length of the intake manifold and the volume of the resonant cavity according to the overall performance of the engine, and then carry out the geometric design according to the space boundary conditions, and then design the design through CFD, After structural strength and NVH analysis, optimization is carried out until the goal is achieved. [0003] One of the key indicators is the flow resistance of the intake manifold. The smaller the flow resistance, the smoother the airflow can enter the engine cylinder, the higher the charge coefficient, the more beneficial to the performance of the engine, especially the naturally aspirated gasoline engine , the charge coefficient has a greater influence. [0004] Referring to the figure, t...
Claims
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Inventor 陈小东徐之勤鄢烈
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD