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Diesel-engine air valve and cylinder head seat retainer leakage detecting and repairing method

A leak detection, diesel engine technology, applied in the direction of detecting the appearance of fluid at the leak point, measuring the acceleration and deceleration rate of the fluid, and using the liquid/vacuum degree for liquid tightness measurement, etc., can solve the waste of production cost and production takt, The detection process cannot accurately and sensitively reflect the assembly quality of the valve seat, and there is no plan to check the valve seat assembly failure, so as to avoid the waste of workpieces.

Inactive Publication Date: 2014-07-23
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of its detection techniques cannot accurately and sensitively reflect the assembly quality of the valve seat ring, and after problems are found, there is no comprehensive and systematic solution for troubleshooting the valve seat assembly faults
Especially for the four-valve cylinder head, it is impossible to quickly and accurately judge which valve is defective, and all four valves need to be dismantled and inspected, which greatly wastes production costs and production cycles

Method used

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  • Diesel-engine air valve and cylinder head seat retainer leakage detecting and repairing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A diesel engine valve and cylinder head seat leakage detection and repair method, comprising the following steps:

[0022] (1) Plugging: Take a diesel engine, each diesel engine has 6 cylinders, and each cylinder has 4 valves; use the plugging head to automatically seal the joint surface between the valve of the first cylinder of the diesel engine and the cylinder head seat;

[0023] (2) Inflation: Inflate the joint surface of the valve and the cylinder head seat, the inflation pressure is 50KPa, and the inflation time is 7s;

[0024] (3) Measure the leakage rate: measure the leakage rate of the first cylinder valve and the cylinder head seat, the measurement pressure is 50KPa, the measurement time is 4s, and the leakage rate is 3.5cm 3 / min;

[0025] (4) Repeat: Repeat steps (1)-(3) to complete the leakage detection of the joint surface between the valve and the cylinder head seat of the second cylinder - the sixth cylinder. The measured pressure and leakage rate of e...

Embodiment 2

[0030] A diesel engine valve and cylinder head seat leakage detection and repair method, comprising the following steps:

[0031] (1) Plugging: Take a diesel engine, each diesel engine has 6 cylinders, and each cylinder has 4 valves; use the plugging head to automatically seal the joint surface between the valve of the first cylinder of the diesel engine and the cylinder head seat;

[0032] (2) Inflation: Inflate the joint surface of the valve and the cylinder head seat, the inflation pressure is 55KPa, and the inflation time is 5s;

[0033] (3) Leakage rate measurement: measure the leakage rate of the first cylinder valve and the cylinder head seat, the measurement pressure is 0.45Bar, the measurement time is 4s, and the leakage rate is 900.5cm 3 / min;

[0034] (4) Repeat: Repeat steps (1)-(3) to complete the leakage detection of the joint surface between the valve and the cylinder head seat of the second cylinder - the sixth cylinder. The measured pressure and leakage rate ...

Embodiment 3

[0043] A diesel engine valve and cylinder head seat leakage detection and repair method, the steps are as follows:

[0044] (1) Plugging: take a diesel engine, each diesel engine has 6 cylinders, and each cylinder has 4 valves; use the plugging head to automatically seal and seal the joint surface between the valve of the first cylinder of the diesel engine and the cylinder head seat;

[0045] (2) Inflation: Inflate the joint surface of the valve and the cylinder head seat, the inflation pressure is 51KPa, and the inflation time is 6s;

[0046] (3) Measure the leakage rate: measure the leakage rate of the first cylinder valve and the cylinder head seat, the measurement pressure is 50Kpa, the measurement time is 5s, and the leakage rate is 3.5cm 3 / min;

[0047] (4) Repeat: Repeat steps (1)-(3) to complete the leak detection of the joint surface between the valve and the cylinder head seat of the second cylinder to the sixth cylinder of the diesel engine;

[0048] Table 3 Com...

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Abstract

The invention relates to a leakage detection process of an automobile part and specifically relates to a diesel-engine air valve and cylinder head seat retainer leakage detection process and repairing strategy and belongs to the technical field of diesel-engine production. Steps of the detection process include blocking, air inflation to a workpiece, leakage rate detection and result judgment. The invention also discloses an air value and cylinder head seat retainer repairing strategy which includes kerosene dropping detection, workpiece replacement or workpiece cleaning, leakage detection, replacement of all air valves and air-valve size measurement, leakage detection, air-valve seat-retainer size measurement and cylinder head replacement. The diesel-engine air valve and cylinder head seat-retainer leakage detection process and repairing strategy have the advantages of being accurate in judgment, zero in workpiece pollution, simple to operate and visible in result and the like. Timely fault finding and processing of an assembly line are facilitated so that the product quality is ensured.

Description

technical field [0001] The invention relates to a leakage detection process of auto parts, in particular to a leakage detection process of a diesel engine valve and a cylinder head seat and a repair strategy, belonging to the technical field of diesel engine production. Background technique [0002] The assembly quality of diesel engine valves and valve seats will directly affect the output power and fuel consumption of the engine, but how to evaluate the fit quality of valves and cylinder head seats is a relatively complicated issue. In the past engine assembly lines, pneumatic measuring instruments were often used to detect the leakage of valves and cylinder head seat rings; the results were not intuitive and the detection reliability was low. In recent years, with the rapid development of leak detection technology, dry detection technology has been applied in assembly lines. However, most of its detection techniques cannot accurately and sensitively reflect the assembly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/26G01M3/04
Inventor 朱炜陈磊李建刚许戈李红剑张立史胜祥宋蔚张俊雄
Owner CHINA FIRST AUTOMOBILE
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