Automobile engine main bearing cap bolt model selection and checking method

A technology for automobile engines and main bearing caps, applied in computer-aided design, special data processing applications, instruments, etc., can solve the problems of safety risks in main bearing cap bolts and insufficient design methods of main bearing cap bolts, etc., to improve design Effects of safety margin, simplification of force model, and improvement of work efficiency

Active Publication Date: 2021-03-19
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 type selection and checking method for main bearing cap bolts of an automobile engine, which is used to solve the technical problem that the design method of the main bearing cap bolts in the prior art is not perfect enough to cause safety risks in the use of the main bearing cap bolts

Method used

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  • Automobile engine main bearing cap bolt model selection and checking method
  • Automobile engine main bearing cap bolt model selection and checking method
  • Automobile engine main bearing cap bolt model selection and checking method

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Experimental program
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Embodiment 1

[0047] This embodiment provides a type selection and verification method for the main bearing cap bolts of an automobile engine, which is used to solve the technical problem that the existing technology is not perfect in the type selection method for the main bearing cap bolts of the engine, which leads to safety risks during use. Specifically, in the existing design methods for the bolts of the main bearing cap of the engine, the actual conditions such as the friction coefficient dispersion, yield strength dispersion, specifications and dimensions of the bolts are not considered, and most of the bolts of different specifications are selected according to different specifications. The selection is made by trial and error. Due to the above reasons, the pretightening force of the selected bolts may not meet the requirements, and the selection and verification process is complicated and error-prone, so that the selected bolts have a greater safety risk when used.

[0048] Such as ...

Embodiment approach

[0068] The present embodiment is as a kind of exemplary embodiment of embodiment 1, as follows:

[0069] Step 1.1: The maximum engine burst pressure P is known max 98.5MPa, cylinder block 6 cylinder hole diameter d g is 82mm, calculate the maximum working load F of the engine by formula 1 g =52.02kN.

[0070] Step 1.2: Calculate the maximum dynamic load F of the bearing shell on the main bearing cap 2 by formula 2 b = 34.85kN.

[0071] Step 1.3: Know the bearing thickness t bs is 1.8mm, the main bearing pad width w bs is 21.2mm, the allowable contact stress σ of the bearing material bs is 351MPa, calculate the pretightening force F required to prevent the bearing bush from being opened by formula 3 V = 26.79kN.

[0072] Step 1.4: Calculate the pretightening force F to be provided by a single bolt 1 on the main bearing cap 2 through formula 4 n = 30.82kN.

[0073] Step 1.5: The main bearing cap 2 is ductile iron, the flatness of the bearing surface is required to be 0...

Embodiment 3

[0079] This embodiment is used as a practical embodiment of the present invention. In this embodiment, the calculation function of the EXCEL form is used to execute the method in the above-mentioned embodiment, that is, to input formula 1 to formula 9 into the EXCEL form and associate them. 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 an automobile engine main bearing cap bolt model selection and checking method, and belongs to the technical field of automobile manufacturing. According to the method, the maximum working load of the engine is obtained through the maximum explosion pressure of the engine, the maximum dynamic load of the bearing bush of the main bearing cover is further obtained, the pre-tightening force needed for preventing the main bearing bush from being opened under the static assembling condition is considered, and the preset safety coefficient is determined according to axial force attenuation; simplifying is performed to obtain a pre-tightening force required to be provided for fastening a bearing bush by using a single bolt, forward model selection is performed on the bolt, and the actual maximum pre-tightening force and the actual minimum pre-tightening force of the bolt is accurately calculated by considering the specification, the size, the friction coefficient dispersion difference, the yield strength dispersion difference and the actual condition among multiple batches of bolts in a mass production state of the bolt. and finally checking is carried out. According to the method, forward model selection can be accurately carried out on the automobile engine main bearing cap bolt, the method is simple, convenient and perfect in consideration, and the selectedbolt better conforms to the actual running condition of an automobile engine.

Description

technical field [0001] The invention belongs to the technical field of vehicle manufacturing, in particular to a method for selecting and checking bolts of a main bearing cover of an automobile engine. Background technique [0002] The main bearing cap bolts are mainly used for the fastening connection between the engine block, crankshaft, main bearing shell and main bearing cap. By tightening, the main bearing cap will generate uniform and appropriate axial preload, and the crankshaft will be tightened on the cylinder block. Support and positioning. During the operation of the engine, the main bearing cap bolts are fastened so that the main bearing cap is not easy to loosen; and a proper and uniform lubricating oil film gap is formed between the main bearing hole and the diameter of the crankshaft main bearing to ensure the crankshaft is reliable when it runs at high speed. and durability. The bolts of the main bearing cap shall have sufficient rigidity and fatigue streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/15G06F111/10G06F119/14G06F119/18
CPCG06F30/17G06F30/15G06F2119/14G06F2119/18G06F2111/10
Inventor 张继杨唐元媛黄洪浪王静秋徐天添
Owner DONGFENG MOTOR CORP HUBEI
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