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Calculation method and system for valve piston limit clearance

A calculation method, technology of piston clearance, applied in internal combustion piston engine, design optimization/simulation, geometric CAD, etc., can solve problems such as long building time of CAE model, ignoring design and transmission chain tolerance, complex calculation formula, etc., to shorten the design cycle, improving development efficiency, and the effect of efficient implementation

Active Publication Date: 2022-05-24
芜湖航瑞航空动力产业技术研究院有限公司 +1
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Problems solved by technology

[0004] The above two calculation and analysis methods have the disadvantages of complex calculation formulas, low solution accuracy, long CAE model building time, requiring designers to have simulation analysis capabilities, and ignoring design and transmission chain tolerance factors.

Method used

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  • Calculation method and system for valve piston limit clearance
  • Calculation method and system for valve piston limit clearance
  • Calculation method and system for valve piston limit clearance

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Embodiment Construction

[0031] The present invention theoretically corrects the traditional calculation method, increases the effects of dimensional tolerances, cam type line processing errors and transmission chain assembly and transmission errors, etc., and uses Excel's powerful calculation functions to convert the cumbersome and complex traditional formula calculations into simple and powerful analysis programs to achieve analysis automation, the designer only needs to check the reliability of the input data, greatly reducing the designer's requirements for simulation capabilities.

[0032] Specifically, the calculation method of the ultimate clearance analysis of the valve piston movement, the steps include:

[0033] 1) Determine the equation of motion of the piston Crankshaft angle, assuming that the piston starts to move from the upper stop point, the crank radius is R, the connecting rod length L, and the crankshaft angle Get the equation of motion of the piston:

[0034] 2) Determine the val...

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Abstract

The invention discloses a method for calculating the limit clearance of a valve piston: the following parameters are input: crank radius R, connecting rod length L, the nominal distance H between the valve top and the piston valve pit when the crankshaft rotation angle valve is closed l , Tolerance Δ of each associated moving part 1 , cam total error Δ α , valve phase adjustment angle δ, valve inclination angle β, determine the motion equation of the piston according to the relevant formula: determine the valve lift Calculate the valve and piston clearance C according to the relevant formula. The system and method construct a new calculation method and a simple and efficient implementation, so as to better guide the design, improve the development efficiency and shorten the design cycle.

Description

Technical field [0001] The present invention relates to the technical field of piston engine combustion system, particularly to the calculation and analysis method of the valve piston limit clearance. Background [0002] Valves and pistons are important components in the realization of engine performance, and the performance of the engine is achieved through the opening of the valves and the reciprocating movement of the piston. When the engine is working, the valve and piston follow a certain law in motion, when the piston moves upward from the lower stop point, when the upper stop point is reached, if the valve is still in a large open state, there will be a phenomenon of the valve hitting the piston, in order to smooth the movement of the valve and the piston, it is necessary to ensure that there is enough clearance between the piston and the valve. [0003] At present, the traditional valve piston clearance analysis method is roughly divided into two types: 1) by building a m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/17
CPCG06F30/20Y02T10/12
Inventor 刘芳田入园陶丽芳刘建华
Owner 芜湖航瑞航空动力产业技术研究院有限公司
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