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Evaluation method of service life of engine valve clearance adjustment plate

A technology for engine valves and valve clearances, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems affecting engine performance, valve cam profile wear, and impact

Active Publication Date: 2018-08-07
CHINA NORTH ENGINE INST TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the valve clearance adjustment piece fails, it will cause abnormal wear of the valve cam profile in contact with it, and the damage of the cam profile will affect the valve clearance and valve movement, which will affect the performance of the engine and lead to irregular valve movement. Continuously produce large impact and noise, and sometimes cause other failures

Method used

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  • Evaluation method of service life of engine valve clearance adjustment plate
  • Evaluation method of service life of engine valve clearance adjustment plate
  • Evaluation method of service life of engine valve clearance adjustment plate

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Embodiment Construction

[0026] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] In addition, the task profile of the engine mentioned in the embodiments of the present invention refers to the time sequence description of the engine's rotational speed, power and torque during the period when the engine completes the specified task.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0029] A method for assessing the service life of an engine valve clearance adjustment plate, such as figure 1 shown, including the following steps:

[0030] Step 1, determine the working condition of the engine and its corresponding working time and working speed;

[0031] Specifically, according to the task profile of the engine, determine the working conditions included in the engine task profile, and determine the correspond...

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Abstract

The invention provides an assessment method for working life of a valve lash adjustment sheet of an engine. The method comprises the following steps of: determining a working condition as well as corresponding working time and working speed of the engine; determining a maximum contact stress of the valve lash adjustment sheet of the engine working in different working conditions; determining a contact fatigue strength parameter of the valve lash adjustment sheet; determining effective contact stress and working condition for life assessment of the valve lash adjustment sheet; determining an engine mission profile cycle index of the valve lash adjustment sheet; and determining the working life of the valve lash adjustment sheet. The method has the following advantages: the working life of the valve lash adjustment sheet can be determined for a specific mission profile of the engine, and the reliability assessment, structural optimization design and repair scheme establishment of the valve lash adjustment sheet can be effectively guided.

Description

technical field [0001] The invention belongs to the technical field of diesel engine structure reliability evaluation, and in particular relates to an evaluation method for the service life of an engine valve clearance adjusting plate. Background technique [0002] The valve clearance adjustment piece is one of the core parts of the diesel engine valve train. The reliability of the valve clearance adjustment plate directly affects the reliability of the engine valve train, and also affects the performance indicators such as the output power of the engine. Contact fatigue damage is one of the typical failure modes of the valve clearance trim. When the contact fatigue failure occurs in the valve clearance trim, the surface of the valve clearance trim will peel off and wear abnormally. Once the valve clearance adjustment piece fails, it will cause abnormal wear of the valve cam profile in contact with it, and the damage of the cam profile will affect the valve clearance and va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 王正王增全王小慧王阿娜和龙
Owner CHINA NORTH ENGINE INST TIANJIN
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