Automobile engine connecting rod bolt model selection and checking method

A technology for automobile engines and bolts, which is applied in special data processing applications, instruments, and electrical digital data processing, etc., can solve problems such as imperfect selection methods of connecting rod bolts and existing safety risks, so as to improve the design safety margin and simplify Force model, the effect of improving 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 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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  • Automobile engine connecting rod bolt model selection and checking method
  • Automobile engine connecting rod bolt model selection and checking method
  • Automobile engine connecting rod bolt model selection and checking method

Examples

Experimental program
Comparison scheme
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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

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

[0069] 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.

[0070] 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

[0080] 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 an automobile engine connecting rod bolt model selection and checking method, and belongs to the technical field of automobile manufacturing. According to the method, the connecting rod is divided into the rotary motion part and the reciprocating motion part, so that the maximum inertia force of the connecting rod is accurately obtained, the pre-tightening force needed forpreventing the main bearing bush from being opened under the static assembly condition is considered, and the preset safety coefficient is determined according to axial force attenuation; and finally, simplifying is performed to obtain a pre-tightening force required to be provided for fastening the bearing bush by a single bolt, then forward model selection is carried out 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 specifications and sizes, the friction coefficient dispersion difference, the yield strength dispersion difference and the actual conditions of multiple batches of bolts in a mass production state of the bolt. Finally, checking is carried out. According to the method, forward model selection can be accurately carried out on the automobile engine connecting rod bolt, the method is simpler and more convenient and complete in consideration, and the selected bolt can better meet the actual running condition of the automobile engine connecting rod.

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 Applications(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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