Centrifugal separating filter

Details Centrifugal separating filter Centrifugal separating filter

1997-06-20

1998-07-14

Cooley, Charles E.

Imperforate bowl: centrifugal separators

With condition responsive means

For controlling inlet valve

494 7, 494 24, 494 49, 494 84, 494901, 2103601, 2104165, B04B 906, F01M 1103

Patent

active

057796181

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a centrifugal separating filter, and more particularly, to a filter for separating, by centrifugal force, foreign materials which are mixed in lubricating oil of an internal combustion engine.


BACKGROUND ART

Hitherto, reducing combustion temperature has been considered as one means for improving exhaust emission of an internal combustion engine. To realize this, the fuel injection timing is delayed, and fuel is injected even after a piston has entered an expansion stroke. For this reason, a fuel injection range extends to an outer periphery of the piston, and afterburning due to delayed injection timing increases, so that soot particles are likely to attach to a cylinder liner. The soot particles, attached to the cylinder liner, are scraped off by a piston ring, and drop into the oil pan together with lubricating oil. When the amount of soot particles mixed into the lubricating oil increases, there arises a problem in that deterioration of the lubricating oil is hastened and early-clogging of an oil filter is caused.
FIG. 3 is a schematic diagram of an engine lubrication circuit. Lubricating oil, which has lubricated each part of an engine (internal combustion engine) 1, is pumped by an oil pump 3 after returning to an oil pan 2. About 90% of the pumped lubricating oil is filtered by a full-flow filter 4, and fed under pressure to each part of the engine 1. The remaining 10% of the lubricating oil is filtered by a by-pass filter 5, and returns again to the oil pan 2. By-pass filters 5 are roughly divided into two types: one type filters lubricating oil through a filter paper, and the other type rotates the lubricating oil at high speed to separate foreign materials and soot particles by centrifugal force.
As a technique for cleaning the lubricating oil by separating foreign materials through the use of centrifugal force, a centrifugal force-type filter disclosed in Japanese Unexamined Patent Publication No. 55-152952, for example, has been known. The filter is provided on a side surface of a flywheel, and rotated by the rotation of the engine crankshaft. In addition, SAE PAPER 902124 discloses a filter which rotates a fluid itself by pressure thereof using a turbine principle (utilization of reactive force of oil jet). However, these methods cannot provide sufficient centrifugal force because of the low rotational speed of the filter, so light-weight soot particles cannot be completely removed.
A centrifugal by-pass filter 10 (hereinafter, referred to as a filter 10), shown in FIG. 4, rotates an inner cylinder 11, which is a rotating member, using engine oil pressure, and at the same time, cleans lubricating oil by centrifugation. The lubricating oil, which has bypassed from a hydraulic circuit of an engine, flows into the filter through an oil inlet 14, provided at a lower portion of the filter 10, and rises in a hollow spindle 15. After rising, the lubricating oil passes through each of the holes in the hollow spindle 15, the baffle plate 16, and the screen 17 to be discharged into an inner space of the inner cylinder 11. Foreign materials, mixed in the lubricating oil, are separated and aggregated to attach to an inner wall of the inner cylinder 11 in the form of sludge. On the other hand, clean lubricating oil is fed to a drive chamber 18 through a hole formed in the lower portion of the screen 17. The clean lubricating oil passes through an oil exhaust nozzle 13 to thereby rotate the inner cylinder 11. Under a normal engine oil pressure of 4 to 7 kg/cm.sup.2, the rotational speed of the inner cylinder 11 is 4000 to 7000 rpm. The clean lubricating oil, which has passed through the oil exhaust nozzle 13, returns to the oil pan from the oil outlet 19.
In recent years, however, dispersibility of the lubricating oil, i.e., the ability to disperse and hold fine soot particles of about 0.1 .mu.m in oil has improved. For this reason, it has become difficult for a centrifugal force at about 4000 to 7000 rpm to separate soot particles, etc., mixed in the lubr

REFERENCES:
patent: 3432091 (1969-03-01), Beazley
patent: 3784092 (1974-01-01), Gibson
patent: 4221323 (1980-09-01), Courtot
patent: 4492631 (1985-01-01), Martin
patent: 4498898 (1985-02-01), Haggett
patent: 4557831 (1985-12-01), Lindsay et al.
patent: 5096581 (1992-03-01), Purvey
SAE Paper 902124.

Affiliated with

Also associated with

Rating

Centrifugal separating filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Centrifugal separating filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Centrifugal separating filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1876792