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Leak detection method of rear oil seal of diesel engine crankshaft

A leak detection and diesel engine technology, which is applied in the direction of measuring the increase and decrease rate of the fluid, and using the liquid/vacuum degree to measure the liquid tightness, etc., can solve the problem that the leakage rate of the oil seal after the crankshaft fluctuates greatly, cannot be effectively guided, and cannot be real Accurately reflect the leakage of crankshaft rear oil seal and other problems, and achieve the effect of improving production efficiency

Active Publication Date: 2016-08-17
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the leakage rate of the crankshaft rear oil seal obtained by the above leakage detection method fluctuates greatly, and the leakage rate cannot truly reflect the leakage of the crankshaft rear oil seal, so it cannot effectively guide the current production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one: a kind of leakage detection method of diesel engine crankshaft rear oil seal, comprises the following process steps:

[0018] (1) Brush oil: use a brush to evenly coat a layer of 15W-40 lubricating oil on the outer circle of the crankshaft timing gear, and wrap the bristles on the head of the brush with non-woven fabric;

[0019] (2) Install the rear oil seal: install the crankshaft rear oil seal on the crankshaft timing gear;

[0020] (3) Rotate the crankshaft: rotate the crankshaft counterclockwise for 5 turns;

[0021] (4) Vacuuming: seal and seal between the flywheel housing and the crankshaft timing gear (using sealing strips to realize the sealing between the flywheel housing and the crankshaft timing gear), and vacuumize; the vacuuming pressure is -0.18Bar, The holding time is 9 seconds;

[0022] (5) Leakage rate measurement: measure the leakage rate of the crankshaft rear oil seal with a leak detector, and the measurement time is 3 seconds;

...

Embodiment 2

[0024] Embodiment two: a kind of leakage detection method of diesel engine crankshaft rear oil seal, comprises the following process steps:

[0025] (1) Brush oil: use a brush to evenly coat a layer of 15W-40 lubricating oil on the outer circle of the crankshaft timing gear, and wrap the bristles on the head of the brush with non-woven fabric;

[0026] (2) Install the rear oil seal: install the crankshaft rear oil seal on the crankshaft timing gear;

[0027] (3) Rotate the crankshaft: rotate the crankshaft counterclockwise for 10 turns;

[0028] (4) Vacuuming: seal and seal between the flywheel housing and the crankshaft timing gear (using sealing strips to realize the sealing between the flywheel housing and the crankshaft timing gear), and vacuumize; the vacuuming pressure is -0.22Bar, The holding time is 10 seconds;

[0029] (5) Leakage rate measurement: measure the leakage rate of the crankshaft rear oil seal with a leak detector, and the measurement time is 4 seconds; ...

Embodiment 3

[0031] Embodiment three: a kind of leakage detection method of diesel engine crankshaft rear oil seal, comprises the following process steps:

[0032] (1) Oiling by brush: use a brush to evenly coat a layer of 460 gear oil on the outer circle of the crankshaft timing gear, and wrap the bristles on the head of the brush with non-woven fabric;

[0033] (2) Install the rear oil seal: install the crankshaft rear oil seal on the crankshaft timing gear;

[0034] (3) Rotate the crankshaft: rotate the crankshaft counterclockwise for 8 turns;

[0035] (4) Vacuuming: seal and seal between the flywheel housing and the crankshaft timing gear (using sealing strips to realize the sealing between the flywheel housing and the crankshaft timing gear), and vacuumize; the vacuuming pressure is -0.2Bar, The holding time is 9 seconds;

[0036] (5) Leakage rate measurement: measure the leakage rate of the crankshaft rear oil seal with a leak detector, and the measurement time is 3 seconds;

[00...

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PUM

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Abstract

The invention relates to a method for detecting the leakage of a rear oil seal of a crankshaft of a diesel engine. The method is characterized by comprising the following process steps that (1) coating of oil is conducted, wherein a hairbrush is used for uniformly coating the outer circle of a crankshaft timing gear with a layer of 15-40 W lubricating oil or 460 gear oil; (2) the rear oil seal is installed, wherein the rear oil seal of the crankshaft is installed on the crankshaft timing gear; (3) the crankshaft is twisted, wherein the crankshaft is twisted anticlockwise for 5-10 circles; (4) vacuum pumping is conducted, wherein the space between a flywheel casing and the crankshaft timing gear is blocked and sealed, vacuum pumping is conducted, the vacuum pumping pressure ranges from minus 0.8 Bar to minus 0.22 Bar, and the dwell time ranges from 9 seconds to 10 seconds; (5) the leakage rate is measured, wherein the leakage rate of the rear oil seal of the crankshaft is measured through a leakage detector, and the measuring time ranges from 3 seconds to 4 seconds; (6) a result is determined, wherein if the measured leakage rate of the rear oil seal is smaller than or equal to 15 cm<3> / min, it is determined that the rear oil seal is qualified, and the rear oil seal is unqualified otherwise. By means of the method, the installation quality of the rear oil seal of the crankshaft can be accurately judged, and production can be effectively guided.

Description

technical field [0001] The invention relates to a leakage detection method of auto parts, in particular to a leakage detection method of a crankshaft rear oil seal of a diesel engine, and belongs to the technical field of diesel engine production. Background technique [0002] During the assembly process of the diesel engine, a rear oil seal needs to be installed between the flywheel housing and the crankshaft timing gear to prevent the lubricating oil in the body cavity from leaking out. Generally, diesel engine manufacturers use hot test to check the three leaks of the engine; if the leakage of the rear oil seal is discovered during the hot test, it will cause rework of the whole machine and increase the cost of test run and maintenance. [0003] In recent years, with the rapid development of leak detection technology, dry detection technology has been applied in the production line. Some diesel engine manufacturers will conduct leak detection on the rear oil seal. Durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/34
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