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A type selection and checking method of connecting rod bolts of automobile engine

An automotive engine and bolt technology, applied in instrumentation, geometric CAD, design optimization/simulation, etc., can solve the problems of safety risks and insufficient selection method of connecting rod bolts, so as to improve the design safety margin and simplify the stress. Model, the effect of improving work efficiency

Active Publication Date: 2022-04-15
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 method for selecting and checking the connecting rod bolts of an automobile engine, which is used to solve the technical problem in the prior art that the method for selecting the connecting rod bolts is not perfect enough to cause safety risks during use

Method used

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  • A type selection and checking method of connecting rod bolts of automobile engine
  • A type selection and checking method of connecting rod bolts of automobile engine
  • A type selection and checking method of connecting rod bolts of automobile engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a method for selecting and checking the connecting rod bolts of an automobile engine, which is used to solve the technical problem that the connecting rod bolts selecting method in the prior art is not perfect enough to cause safety risks during use. Specifically, in the prior art methods for designing engine connecting rod bolts, 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 are selected through different specification bolts. The selection is made by trial and error, and the maximum inertial force of the connecting rod cannot be accurately defined. 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 all There is a greater safety risk in the use of selected bolts.

[0048] Such as ...

Embodiment approach

[0076] The present embodiment is as a kind of exemplary embodiment of embodiment 1, as follows:

[0077] Step 1.1, the length of the connecting rod 2 is the distance from the center of the big head 2-1 of the connecting rod (the center of the round hole of the rotating part) to the center of the small head of the connecting rod (the center of the round hole of the reciprocating part) l = 139mm, the center of mass of the connecting rod 2-2 to the connecting rod Rod head 2-1 center distance l 1 is 33.89mm, and the weight of the connecting rod group (including connecting rods, bearing bushes and bolts) mc is 502g. Calculate the weight m of the reciprocating part by formula 1 1 =122g, calculate the weight m of the rotating part by formula 2 2 = 380 g.

[0078] Step 1.2, the weight of piston 1 m p =393g, the maximum speed of the engine n=6900rpm, the crankshaft radius r=44mm of the connecting rod 2, the total weight of the rotary motion of the connecting rod 2 is 380g, and the ...

Embodiment 3

[0088] 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 10 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 a type selection and checking method for connecting rod bolts of an automobile engine, and belongs to the technical field of vehicle manufacturing. The method provided by this application obtains the maximum inertial force of the connecting rod accurately by dividing the connecting rod into a rotating part and a reciprocating part, and considers the preload force required to prevent the main bearing bush from opening under static assembly conditions, and according to The predetermined safety factor determined by the attenuation of the axial force is finally simplified to the pretightening force required to provide a single bolt to fasten the bearing pad, and then the bolt is selected in a forward direction, and then the bolt is in the state of mass production. Multi-batch bolts According to the specification and size of the bolt, the dispersion of friction coefficient, the dispersion of yield strength and the actual situation, the actual maximum pre-tightening force and the actual minimum pre-tightening force of the bolts are calculated accurately, and finally checked. The method can accurately select the forward type of the connecting rod bolts of the automobile engine, the method is more convenient and considerate, and the selected bolts can better meet the actual conditions of the operation of the connecting rod of the automobile engine.

Description

technical field [0001] The invention belongs to the technical field of vehicle manufacturing, and in particular relates to a type selection and checking method for connecting rod bolts of an automobile engine. Background technique [0002] The connecting rod bolts of automobile engines are mainly used for the fastening connection between the big end of the connecting rod, the crank pin, the connecting rod shell and the connecting rod cover. Support and positioning. When the engine is running, the small end of the connecting rod is connected with the piston pin and reciprocates with the piston; the large end of the connecting rod is connected with the crank pin and rotates with the crankshaft. The connecting rod set is subject to alternating loads such as compression, tension and bending. Through the pre-tightening force of the connecting rod bolts, it is ensured that the big end of the connecting rod is not easy to loosen, and an appropriate and uniform lubricating oil fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/17G06F30/20G06F119/14
CPCG06F30/15G06F30/17G06F30/20G06F2119/14
Inventor 张继杨卢学健吴斌峰杨章俊张炜
Owner DONGFENG MOTOR CORP HUBEI
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