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A Prediction Method of Connection Strength of Hydraulic Expansion Joint Assembled Camshaft Based on Energy Balance

A connection strength and energy balance technology, which is applied in the direction of valve device, design optimization/simulation, machine/engine, etc., can solve the problems of complicated processing process and no connection strength, so as to improve the overall performance, save manpower and financial resources, and improve the use The effect of longevity

Active Publication Date: 2020-10-02
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 106930794 A discloses a new connection structure for internal high-pressure forming of an engine assembled camshaft, namely: an equidistant profile and a logarithmic helical cam structure. These two structures can transmit large working loads and effectively improve the assembly The connection strength of the camshaft, thereby improving the overall performance of the engine, but this patent only proposed two new structures, which theoretically improved the connection strength, but did not carry out the prediction, verification and analysis of the connection strength; Chinese patent CN 106777780 A discloses a method for analyzing the mechanism of flexible static pressure expansion of tube-tube-sheet joints. The method is to construct a mechanical analysis model for flexible static pressure expansion of tube-tube-sheet joints, and to carry out a method for heat exchange tubes with a circular structure. Based on a series of theoretical derivations, the relationship model between the expansion pressure and the residual contact pressure between the tube-tube sheet after expansion is established, and the expansion required for the tube-tube-sheet joints for expansion and strength expansion is obtained. The method is comprehensive and detailed for the analysis of the static pressure expansion process, which can provide a certain reference for the design and manufacture of flexible static pressure expansion pipe-tube-sheet joints, but this method is mainly for circular, For the analysis of the regular cam structure, the force distribution on the pipe is uniform at this time, and the calculation model is more accurate; for the non-circular and irregular cam structure, some assumptions in the method may no longer be applicable At the same time, this method also requires a large number of calculations and force analysis, and the processing process is relatively complicated

Method used

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  • A Prediction Method of Connection Strength of Hydraulic Expansion Joint Assembled Camshaft Based on Energy Balance
  • A Prediction Method of Connection Strength of Hydraulic Expansion Joint Assembled Camshaft Based on Energy Balance
  • A Prediction Method of Connection Strength of Hydraulic Expansion Joint Assembled Camshaft Based on Energy Balance

Examples

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Embodiment 1

[0033] For circular, regular cam structures such as Figure 2-a , Figure 2-b As shown, this example takes the circular structure as an example to illustrate the prediction of the connection strength of the hydraulic expansion joint assembled camshaft:

[0034] refer to figure 1 , a method for predicting the connection strength of a hydraulic expansion joint assembled camshaft based on energy balance, including the following steps:

[0035] 1) Build the expansion joint model: in the expansion joint model, the hollow mandrel 4, such as image 3 As shown, the expansion joint is completed with the cam 1 under the action of the hydraulic pressure P, and the hydraulic expansion joint principle of the assembled camshaft is as follows Figure 4 As shown, put the cam 1, the positioning ring 2 and the journal 3 into the mold cavity, fix the position, and insert the mandrel 4 into it; At this time, there is a certain initial gap between the outer wall of the mandrel 4 and the inner ...

Embodiment 2

[0041] For non-circular and irregular cam structures such as Figure 2-c , Figure 2-d , Figure 2-e As shown, this example takes the equidistant profile structure as an example to illustrate the prediction of the connection strength of the hydraulic expansion joint assembled camshaft:

[0042] refer to figure 1 , a method for predicting the connection strength of a hydraulic expansion joint assembled camshaft based on energy balance, including the following steps:

[0043] 1) Build the expansion joint model: in the expansion joint model, the hollow mandrel 4, such as image 3 As shown, the expansion joint is completed with the cam 1 under the action of the hydraulic pressure P, and the hydraulic expansion joint principle of the assembled camshaft is as follows Figure 4 As shown, put the cam 1, the positioning ring 2 and the journal 3 into the mold cavity, fix the position, and insert the mandrel 4 into it; At this time, there is a certain initial gap between the outer w...

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Abstract

The invention discloses a method for predicting the connection strength of a hydraulic expansion joint assembled camshaft based on energy balance, which is characterized in that it comprises the following steps: 1) constructing an expansion joint model; 2) obtaining elastic-plastic deformation work W d ; 3) The obtained frictional energy is W f ;4) Obtain the internal energy Q; 5) Obtain the connection strength. This method can quickly, accurately and efficiently predict the connection strength of the hydraulic expansion joint assembled camshaft, and then continuously optimize the relevant parameters to achieve the purpose of improving and improving the service life and overall performance of the engine.

Description

technical field [0001] The invention relates to the technical field of an engine assembled camshaft, in particular to a method for predicting the connection strength of a hydraulic expansion joint assembled camshaft based on energy balance. Background technique [0002] The camshaft is a key component of the valve train in the engine, mainly composed of a core shaft, a cam and a journal. The traditional camshaft is an integral camshaft, which is usually manufactured by casting, forging and cutting. Assembled camshafts are made by processing and manufacturing the parts of the camshaft separately, and then connecting and assembling the parts of the camshaft. This makes full use of the material performance advantages of each part, and has the advantages of reasonable structure distribution, light structure and low processing cost. low merit. At present, the assembled camshaft technology is developing at a relatively fast speed, emerging in high-performance engines, and has a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23F01L1/047
Inventor 杨连发马建平黄端港何玉林黄进杰姜靖宇刘君
Owner GUILIN UNIV OF ELECTRONIC TECH