JPH08100622A - Filter element - Google Patents

Abstract

PURPOSE: To dispense with an inner tube for minimizing pressure loss by composing a filter medium for an annular cylindrical filter element in a triple layer, and using the filter medium which is larger in a filter bore than a medium layer and higher in rigidity for the most outer and the most inner layer. CONSTITUTION: A filter element consists of a filtering body 2 and upper and lower end plates. In the filtering body 2, a filter medium which is large in a filter bore and somewhat more rigid (for example stainless steel 100 mesh) 5, 7 is applied to the most outer and the most inner layer, and a filter medium being small in the filter bore (for example stainless steel 300 mesh) is applied to a medium layer. Thus the filtering body 2 itself is made stronger, and an inner tube is disused to reduce pressure loss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element used for an oil filter for an internal combustion engine,
Regarding the one without the inner tube.

[0002]

2. Description of the Related Art Heretofore, a filter element accommodated in an oil filter or the like has been one in which an inner tube formed of a perforated metal plate or the like maintains strength and a filter material folded around it in a chrysanthemum shape is arranged. The filter medium is often a double layer, and the outside has a filter aperture larger than that of the inside, and the coarse dust is trapped in the previous stage to extend the life.

[0003]

It is necessary for the filter element to minimize the pressure loss with respect to the filtrate passing therethrough. However, in view of the conventional pressure loss occurrence state, the inner tube is the largest resistor, and the pressure loss is large. It is known that this is the largest factor.

[0004]

The filter element of the present invention eliminates the inner tube, and the filter media are stacked in three layers.
This is a filter element in which the outermost layer and the innermost layer have a filter diameter larger than that of the intermediate layer and are slightly rigid.

[0005]

[Function] The filter media of the outermost layer and the innermost layer have a large filter diameter,
For example, wire mesh has a large wire diameter, and fibrous material has a large rigidity due to the fact that the fiber is thick and the thickness is large.Therefore, when this is pleated and used as the innermost layer, the filter itself Can have strength equivalent to that of a conventional inner tube. Moreover, since it is a filter medium, it does not function as a resistor like an inner tube, and pressure loss is reduced.

[0006]

1 and 2 show an embodiment. The filter element 1 is formed by adhering a non-perforated upper end plate 3 and a lower end plate 4 having a central opening to an end surface of a cylindrical filter body 2 folded in a chrysanthemum shape. The filter body 2 is formed by stacking an outermost layer filter medium 5, an intermediate layer filter medium 6, and an innermost layer filter medium 7. The filter materials 5 and 7 are 100 mesh wire nets made of stainless steel, and the filter material 6 is a 300 mesh wire mesh made of stainless steel. These filter materials may be brass wire mesh, or synthetic resin mesh such as nylon. In both cases, the filter media 5 and 7 have a larger wire diameter than the filter media 6 and have some rigidity.

It is also possible to use thick filter paper having thick fibers and a large filter diameter as the filter material of the outermost layer and the innermost layer, and use thin filter paper having fine fibers and a small filter diameter for the intermediate layer. These filter media are 3
The layers are overlapped with each other and folded, and are crimped in a tubular shape by caulking metal fittings (struts) 8 to form a filter body 2.

As shown in FIG. 3, the outermost filter medium 9 and the innermost filter medium 11 may be constituted by one continuous filter medium, and the intermediate filter medium 10 may be sandwiched and folded. In this way, the filter body manufacturing process becomes easy.

As shown in FIG. 4, the innermost filter medium 14 may have a double structure composed of filter mediums 14a and 14b. In this case, the filter media 14a and 14b are of the same quality as the outermost filter media 12,
It has a larger filter diameter and slightly higher rigidity than the filter material 13 of the intermediate layer.

[0010]

In the filter element of the present invention, the inner tube is abolished and replaced by a filter material having a slightly rigid innermost layer and a large filter aperture, thereby reducing the pressure loss while maintaining the required strength. It is a filter element. Moreover, since the innermost layer of the filter material is reinforced from the inside of the folds, the tendency of the folds to be crushed by the hydraulic pressure from the outside can be prevented, and the clogging life can be extended.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example.

FIG. 2 is a vertical sectional view of the embodiment.

FIG. 3 is a cross-sectional view of a main part of another embodiment.

FIG. 4 is a sectional view of a main part of still another embodiment.

[Explanation of symbols]

 3, 4 End plate 5, 6, 7 Filter medium

Claims (1)

[Claims] 1. A filter element in which a sheet-shaped filter medium is folded into a chrysanthemum shape and formed into a tubular shape, and end plates are fixed to the upper and lower end surfaces of the filter element. The filter medium is laminated in three layers so that the outermost layer and the innermost layer have the same quality. A filter element that has a larger filter diameter and a relatively higher rigidity than the filter material of the intermediate layer.