Gasoline engine cylinder cover bolt model selection and checking method

A gasoline engine and cylinder head technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of safety risks in cylinder head bolts and imperfect design methods.

Active Publication Date: 2021-03-30
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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  • Gasoline engine cylinder cover bolt model selection and checking method
  • Gasoline engine cylinder cover bolt model selection and checking method
  • Gasoline engine cylinder cover bolt model 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 cover bolt model selection and checking method, and belongs to the technical field of vehicle manufacturing. The maximum working load of the engineis obtained through the maximum explosion pressure of the engine, the maximum external load of the single bolt of the air cylinder cover is further obtained, the preset safety coefficient determined according to axial force attenuation is finally simplified to the pre-tightening force required for sealing the air cylinder cover through the single bolt, then forward model selection is conducted onthe bolt. The specifications and sizes, the friction coefficient dispersion differences, the yield strength dispersion differences and the actual conditions of the bolts in the mass production state are are considered to accurately obtain the actual maximum pre-tightening force and the actual minimum pre-tightening force of the bolts, and finally perform checking. By means of the method, forward model selection can be accurately conducted on the gasoline engine air cylinder cover bolts, the invention is simpler and more convenient, consideration is complete, and the selected bolts can better meet the actual running situation of a 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 Applications(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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