JPH057710A - Oil filter - Google Patents

Abstract

PURPOSE:To improve the capture function for impurities of fine particles by combining a circular primary filter element forming many pleats on its circumference and a circular secondary filter element formed by rolling filter paper. CONSTITUTION:Oil introduced from an oil inlet 9 to a case 1 flows around a primary filter element 17 having many pleats 23 on its circumference and, after being filtered through the primary filter element 17 and a secondary filter element 18, is led into a pipe 3 through an opening 10 to be discharged from an oil outlet 11. The primary filter element 17 positioned on the upstream side in the oil path line captures impurities of coarse particles, while the secondary filter element 18 positioned on the downstream side in the oil path line captures impurities of fine particles of water, sludge, etc. Since the secondary filter element 18 has the structure of a multi-layered roll and the layers are closely compacted by the pressure of oil introduced, its capture function for impurities is remarkably improved.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an oil filter.

[0002]

2. Description of the Related Art Conventionally, a cylindrical case having an oil inlet and an oil outlet is used to house two annular filter elements, each of which has a large number of pleats radially formed around each other. 2. Description of the Related Art There is an oil filter that separates impurities in oil by passing oil that has flowed in through an oil inlet from an outer filter element to an inner filter element. Here, the outer filter element traps coarse impurities to prevent the inner dense filter element from being clogged, and the inner filter element traps dense impurities.

[0003]

The inner filter element for trapping fine impurities has a finer filter hole than the outer filter element. However, the water content in the oil smaller than the size of the filter hole is contained in the filter element. It is not possible to expect to capture all the sludge and sludge.

[0004]

A ring-shaped primary filter provided with a cylindrical case having an oil inlet and an oil outlet, and having a large number of folds on the periphery and located upstream of the oil passage. The element and an annular secondary filter element, which is formed by winding a long filter paper in a roll shape and is located on the downstream side of the oil passage, are fitted into each other and enclosed in the case.

[0005]

The oil that has flowed into the case from the oil inlet is filtered by the primary filter element and the secondary filter element in order and flows out from the oil outlet. Of fine impurities are trapped by the secondary filter element. Since the secondary filter element wound in a roll shape has a multilayer structure and the layers are adhered to each other, the trapping ability between the layers is improved.

[0006]

An embodiment of the present invention will be described with reference to the drawings. 1 is a cylindrical case with one end open, and this case 1
Has a bracket 2 fixed at a predetermined place, a pipe 3 fixed at a central portion, and a cover 5 closing an opening surface with a packing 4. The cover 5 is fixed by screwing a screw 7 fitted in the center of the cover 5 through an O-ring 6 into the pipe 3. Also, an oil inlet 9 is formed in the case 1, and the pipe 3
A plurality of through holes 10 located in the middle portion and an oil outlet 11 having an opening at one end are formed therein.

An element assembly 12 is housed in the case 1. The element assembly 12 has a cylindrical protector 14 whose both ends are closed by end plates 13, and two inner pipes 15 and 16 of a large size and a small inner pipe provided inside the protector 14.
And the primary filter element 17 housed outside these inner pipes 15 and the inner pipe 1 inside
6 and a secondary filter element 18 housed outside. The protector 14 and the inner pipe 1
A large number of through holes 19 are formed in the wirings 5 and 16. The end plate 13 is provided with a packing 20 that is in close contact with the outer periphery of the pipe 3, and an annular protrusion 21 that supports the outer peripheral edge of the secondary filter element 18. One end of the element assembly 12 is fixed to the spring 22 and the other end is fixed to the inner surface of the cover 5.

As shown in FIG. 2, the primary filter element 17 has a large number of folds 23 arranged radially. The secondary filter element 18 is formed by winding a long filter paper in a roll shape.

In such a structure, the oil inlet 9
The oil poured into the case 1 from the outside flows into the outer periphery of the primary filter element 17, is filtered by the primary filter element 17 and the secondary filter element 18, flows from the through hole 10 into the pipe 3, and further flows out from the oil outlet 11. To be done. That is, the primary filter element 17 is located on the upstream side of the oil flow path and captures impurities having coarse particles. Further, the secondary filter element 18 is located on the downstream side of the oil flow passage and captures fine particles of water and impurities such as sludge. Here, since the secondary filter element 18 wound in a roll shape has a multi-layer structure and the layers are brought into close contact with each other by the pressure of the inflowing oil, the ability to trap impurities between the layers is significantly improved.

[0010]

According to the present invention, a tubular case having a cylindrical case having an oil inlet and an oil outlet and having a large number of folds on the periphery thereof and positioned upstream of the oil passage is provided. The oil inlet is formed by winding the element and a long filter paper in a roll shape and fitting the annular secondary filter element located on the downstream side of the oil flow path into the case by fitting them together. The oil that has been poured into the case from the filter is sequentially filtered by the primary filter element and the secondary filter element and flows out from the oil outlet.In this process, coarse impurities are captured by the primary filter element and fine impurities are captured by the secondary filter element. The secondary filter element, which is captured by and is wound into a roll, is multi-layered and the layers are tight To be, trapping capacity is improved in the layers of the secondary filter element, thus has the effect of such fine particle impurities are reliably separated.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view.

FIG. 2 is a horizontal cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

 1 Case 9 Oil inlet 11 Oil outlet 17 Primary filter element 18 Secondary filter element

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B01D 29/07 F01M 11/03 B 8109-3G 8925-4D B01D 29/06 B

Claims (1)

Claim: What is claimed is: 1. A ring-shaped primary case having a cylindrical case having an oil inlet and an oil outlet, and having a large number of folds in the periphery and located upstream of the oil flow path. It is characterized in that the filter element and a long filter paper are wound in a roll shape, and an annular secondary filter element located on the downstream side of the oil passage is fitted into each other and enclosed in the case. Oil filter.