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A kind of gasoline engine cylinder head bolt type selection and checking method

A gasoline engine and cylinder head technology, applied in the direction of instrument, geometric CAD, design optimization/simulation, etc., can solve the problems of imperfect design method and safety risks of cylinder head bolts, so as to improve the design safety margin and simplify the stress. Model, the effect of improving work efficiency

Active Publication Date: 2022-04-26
DONGFENG MOTOR CORP HUBEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a gasoline engine cylinder head bolt type selection and checking method, which is used to solve the technical problem in the prior art that the bolt design method on the cylinder head is not perfect enough to cause safety risks in the use of the cylinder head bolts

Method used

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  • A kind of gasoline engine cylinder head bolt type selection and checking method
  • A kind of gasoline engine cylinder head bolt type selection and checking method
  • A kind of gasoline engine cylinder head bolt type selection and checking method

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Embodiment 1

[0045] This embodiment provides a gasoline engine cylinder head bolt type selection and verification method, which is used to solve the technical problem that the design method of the cylinder head bolts is not perfect in the prior art, which leads to the safety risk of the cylinder head bolts during use. . Specifically, in the existing design methods of engine cylinder head bolts, the actual conditions such as the friction coefficient dispersion, yield strength dispersion, specification and size of the bolts are not considered, and most of the bolts are selected through trial and error of different specifications. If the wrong way is selected, the pretightening force of the selected bolts may not meet the requirements due to the above reasons, and the selection and verification process is complicated and error-prone, so that the selected bolts have a greater safety risk when used.

[0046] The gasoline engine cylinder head bolt type selection and checking method includes the ...

Embodiment 2

[0065] Embodiment As a kind of exemplary embodiment of embodiment 1, as follows:

[0066]Step 1.1: The maximum engine burst pressure P is known max It is 105MPa, and the diameter of the cylinder hole of cylinder block 2 is d g is 73mm, calculate the maximum working load F of the engine by formula 1 g = 43.95 kN.

[0067] Step 1.2: Calculate the maximum dynamic load F of a single bolt 3 of the cylinder head by formula 2 b = 21.97 kN.

[0068] Step 1.3: Calculate the pretightening force F required by a single bolt 3 to seal the cylinder head 1 by formula 3 v =K×F b =1.6×21.97=35.16kN. In this step, the cylinder head 1 is made of aluminum alloy, the flatness of the pressure bearing surface of the cylinder head 1 is required to be 0.1, the roughness is required to be Ra3.2, and the cylinder head gasket has a double-layer sealing structure.

[0069] Step 2.1: In order to ensure the sealing of the cylinder head gasket, the rated minimum pre-tightening force of the bolt 3 must...

Embodiment 3

[0076] The present embodiment is as a kind of practical embodiment of the present invention, and in the present embodiment, utilize the computing function of EXCEL table, carry out the method in the above-mentioned embodiment, also promptly enter formula 1 to formula 8 in the EXCEL table and carry out correlation, when When a corresponding input value is input, a corresponding output value is obtained, so that the accuracy and efficiency of the calculation of the above method can be improved.

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Abstract

The invention relates to a gasoline engine cylinder head bolt type selection and checking method, which belongs to the technical field of vehicle manufacturing. The method provided by this application obtains the maximum working load of the engine through the maximum explosion pressure of the engine and further obtains the maximum external load of a single bolt of the cylinder head, and finally simplifies it to a single bolt to seal the cylinder head according to the predetermined safety factor determined by the attenuation of the axial force. The required pre-tightening force, and then carry out positive selection of bolts, and then consider the specifications and sizes, friction coefficient dispersion, yield strength dispersion and actual conditions of bolts in mass production, and the actual situation is accurate. Calculate the actual maximum pre-tightening force and the actual minimum pre-tightening force of the bolts, and then check them at last. The method can accurately select the cylinder head bolts of the gasoline engine, the method is simpler and more comprehensive, and the selected bolts are more in line with the actual situation of the gasoline engine.

Description

technical field [0001] The invention belongs to the technical field of vehicle manufacturing, and in particular relates to a method for selecting and checking bolts of a cylinder head of a gasoline engine. Background technique [0002] Cylinder head bolts are mainly used for the fastening connection of the engine cylinder head, cylinder head gasket and cylinder block. By tightening, the cylinder head gasket can be tightened to produce uniform and appropriate axial fastening force, which can seal the high temperature and high pressure gas in the cylinder, and at the same time seal the cooling water and lubricate Oil. Cylinder head bolts must have sufficient rigidity and fatigue strength to withstand the pressure and heat load of the gas in the cylinder, otherwise the "three leaks" problem of the engine will easily occur, which will affect the reliability of the engine and even cause engine damage; therefore, the cylinder head bolts belong to the engine. key pieces. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/20G06F119/14
CPCG06F30/17G06F30/20G06F2119/14
Inventor 张继杨靳晓妍龚婧瑶万鹏潘理杰
Owner DONGFENG MOTOR CORP HUBEI
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