JPH0570607U - Filter element - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a filter element which can secure a gap for allowing a fluid to pass between adjoining filtration surfaces that are bent in a bellows shape and promote a trapping action of foreign matter. [Structure] A sheet-shaped filter medium 1 is bent in a bellows shape with a large number of parallel folds 2 to alternately form a wide V-shaped first filtering surface 3 and a narrow V-shaped second filtering surface 4. In the cylindrical filter element that is arranged in the above and is formed by joining both ends of the filter medium 1, while forming the first projecting protrusion 5a for forming a gap on the inner surface of the wide V-shaped first filtering surface 3, A second ejection projection 5b for forming a gap is provided on at least one of the opposing surfaces of the outer surface of the wide V-shaped first filtering surface 3 and the outer surface of the narrow V-shaped second filtering surface 4. Form.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter element.

[0002]

[Prior Art]

 Conventionally, there is a filter element 50 as shown in FIGS. 5 to 7 as a filter element incorporated in a filtering device. The filter element 50 is formed into a cylindrical shape by joining both ends of a band-shaped filter medium 52 in which a large number of parallel folds 51 are bent in a bellows shape, and end plates 53 are fixed to both ends of the filter element 50, and an inner peripheral surface is formed. Is fitted with a cylinder 54 formed of a steel plate having a large number of holes (see FIG. 7). The reason for forming a large number of folds 51 in the filter medium 52 is to increase the filtration area and to improve the trapping effect of foreign matter contained in the fluid.

As shown in FIG. 7, when both ends of a filter medium 52 having a large number of folds 51 are joined to form a cylindrical shape, the spacing between the folds 51 becomes narrower on the inner side and wider on the outer side. Then, as shown in FIGS. 8 and 9, by changing the interval between the folds 51 of the filter medium 52 and increasing the number of the folds 51, a large number of wide filtration surfaces 56 and a large number of narrow filtration surfaces 57 are alternately arranged. By doing so, there is a filter element 55 in which the interval between the folds 51 in the outer peripheral portion is narrowed to further widen the filtration area. Such a folding method of the filter element 55 is a folding method in which a large number of letters M are arranged radially, which is called M folding.

However, since the filtration surface 57 in the portion where the gap between the folds 51 is short is necessarily stiffer than the filtration surface 56 in the portion where the gap between the folds 51 of the filter medium 52 is long, the gap between the folds 51 is short. Due to the repulsive force on the part of the filtration surface 57, the filtration surfaces 56 of the part where the creases 51 have long intervals come into close contact with each other, and it becomes impossible to pass the fluid to be filtered during this. That is, the entire surface of the filter medium 52 cannot be effectively used, and the filtration area may be reduced.

From this, as shown in FIG. 10, by forming the projections 58 on the filtering surface 56 of the portion where the folds 51 have long intervals, the filtering surface 56 of the adjacent weak portion of the waist is formed. A filter element has been developed in which a fluid is passed through with a gap between them. This is disclosed in Japanese Utility Model Laid-Open No. 61-115126, Japanese Utility Model Laid-Open No. 61-121912, and the like. In order to achieve the same purpose, as described in Japanese Utility Model Laid-Open No. 64-5609 and Japanese Patent Laid-Open No. 64-5610, another member called a spacer is provided between the folds of the filter medium. There are some that are designed to intervene.

[0006]

[Problems to be solved by the device]

 As shown in FIG. 10, when the filter element 55 is mounted on the filtering device, as shown in FIG. 11, the narrow V-shaped filtering surface 57 is bent by the creases 51 having a short interval to strengthen the waist. It shows the action of expanding, and a gap can be formed on the inner surface of the wide V-shaped filtering surface 56 with a weak waist by the projections 58, but with the outer surface of the wide V-shaped filtering surface 56. It becomes difficult to secure a gap between the narrow V-shaped filtering surface 57 and the outer surface, and it is difficult to pass the fluid, and the filtering area of the filter medium 52 cannot be effectively used.

[0007]

[Means for Solving the Problems]

 According to the present invention, a wide V-shaped first filtering surface and a narrow V-shaped second filtering surface are alternately arranged by bending a sheet-shaped filter medium into a bellows shape with a large number of parallel folds. In addition, in the cylindrical filter element formed by joining both ends of the filter medium, the first projecting protrusion is formed on the inner surface of the wide V-shaped filter surface, and the wide V-shaped filter is formed. A second embossing projection is formed on at least one of the opposing surfaces of the outer surface of the surface and the outer surface of the narrow V-shaped filtering surface.

[0008]

[Action]

 The filtration area can be increased by alternately arranging the wide V-shaped first filtration surface and the narrow V-shaped second filtration surface. In addition, the narrow V-shaped second filtering surface maintains the open V-shape due to the strength of the waist due to the short crease spacing, which allows the inner surface of the V-shaped second filtering surface to be maintained. It is possible to secure a clearance for fluid to pass through, and to secure a clearance for fluid to pass through to the inner surface of the first filtration surface by the first ejection projection, and further for the first ejection projection by the second ejection projection. It is possible to secure a gap for allowing fluid to pass between the outer surface of the filtration surface and the outer surface of the second filtration surface. Furthermore, even if the number of arrays of the first and second filtration surfaces is increased, The second projecting protrusions can forcefully align the pitches of the folds between the wide filtration surface and the narrow filtration surface. As a result, the filtering area of the filter medium can be substantially widened to promote the trapping action of foreign matter contained in the fluid, and the life of the filter element can be extended.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a band-shaped filter medium 1 which is a constituent member of a filter element is provided. A large number of folds 2 are formed in the filter medium 1 in a bellows shape. The intervals between the folds 2 are long and short, and a wide V-shaped first filtering surface 3 is formed at a portion where the intervals between the adjacent folds 2 are long, and the interval between the adjacent folds 2 is short. A narrow second filtration surface 4 is formed in the portion. Here, the wide first filtration surface 3 and the narrow second filtration surface 4 are alternately arranged. As a result, by joining both ends of the filter medium 1 and bending it into a cylindrical shape, as shown in FIG. 2, the adjacent narrow V-shaped second filter surfaces 4 and one on each side are arranged. The filter medium 1 is refracted so that the letter "M" is formed by the one surface of the wide first filtration surface 3. Further, each of the wide first filtration surfaces 3 is formed with ejection protrusions 5a and 5b facing each other with the fold line 2 in between. The first projecting projections 5a are projected from the V-shaped inner surface of the wide first filtering surface 3, and the second projecting projections 5b are projected from the V-shaped outer surface of the first filtering surface 3. Further, as shown in FIG. 2, the inside of the cylindrical filter medium 1 is protected by a cylinder 6 formed of a steel plate having many holes.

Next, FIG. 3 shows a filtering device A. The filter element 9 is housed in a case 11 closed by a lid 10. The filter element 9 is completed by bending the filter material 1 into a cylindrical shape and fixing the end plates 7 and 8 at both ends. A packing 12 abutting against the central portion of the lid 10 is fixed to one end plate 7 of the filter element 9, and a spring 13 is interposed between the other end plate 8 and the top of the case 11. There is. The lid 10 is formed with an inlet 14 located outside the packing 12 and an outlet 15 located in the center, the inlet 14 being opened toward the primary side of the filter element 9, and the outlet 15 being the packing. It is directed to the secondary side (inner peripheral surface) of the filter element 9 through an opening 16 formed in the center of the filter element 12. Such a filtering device A is held by a bracket 17.

That is, an annular packing 18 positioned outside the inlet 14 is interposed between the end surface of the bracket 17 and the lid 10. Further, the bracket 17 has a connection port 19 for taking in lubricating oil, an annular flow path 20 communicating with the connection port 19 and the inlet 14, and a discharge path 21 screwed to the outlet 15. Has been formed.

Next, FIG. 4 shows a mounting state of the filtering device A on the engine. First, the piston 23 slidably fitted in the cylinder 22 and the arm 25 of the crankshaft 24 are connected by the connecting rod 26. The oil supply pipe 29 connected to the oil pan 27 via the pump 28 is connected to the connection port of the bracket 31 holding the full flow filter 30, and the discharge passage of this bracket 31 is connected to the lubrication part via the main gallery 32. The main gallery 32 is connected to the lubrication portion of the crankshaft 24 by a branch pipe 33. Then, the discharge passage 21 of the bracket 17 holding the filtering device A is connected to the oil pan 27 via the reflux pipe 35, and the connection port 19 of the bracket 17 is branched from the oil supply pipe 29. It is connected to the branch pipe 35.

Here, the full-flow filter 30 has the same structure as the structure of the filtering device A, and the bracket 31 for holding the full-flow filter 30 has the same structure as the bracket 17 described above. Omit it. However, the filter element incorporated in the full-flow filter 30 has a coarse mesh in order to reduce the flow resistance of the lubricating oil 36 in the oil pan 27.

With such a configuration, when the engine is started, the lubricating oil 36 of the oil pan 27 is supplied to each lubricating portion by the pump 28, and about 97% of the supplied amount of the lubricating oil 36 is supplied by the filter unit 30. Filtered. Further, approximately 3% of the lubricating oil 36 strongly supplied from the pump 28 is filtered by the filtering device A and returned to the oil pan 27. That is, as shown by the arrow in FIG. 3, the lubricating oil 36 flows from the connection port 19 through the annular flow path 20 and the inlet 14 into the case 11, and is filtered by the filter element 9 to flow through the discharge path 21. It is returned to the oil pan 27 via.

Here, as shown in FIG. 2, a wide V-shaped first filtering surface 3 and a narrow V-shaped second filtering surface 4 are alternately arranged to increase a filtering area. can do . Further, the narrow V-shaped second filtering surface 4 maintains the open V-shape due to the strength of its own waist because the interval between the folds 2 is short. For this reason, it is possible to open a gap through which the fluid flows in the V-shaped inner surface of the second filtration surface 4. Furthermore, the first ejection projections 5a can secure a clearance for allowing fluid to pass through to the inner surface of the first filtration surface 3. In this case, since the first ejection projections 5a are located on both sides of the fold 2 located in the V-shaped valley of the first filtration surface 3, the first ejection projections 5a come into contact with each other. Therefore, it is possible to easily form the first projecting projections 5a by lowering the projecting height. Of course, the same purpose can be achieved by forming the first projecting projection 5a on only one inner surface of the first filtering surface 3 with the V-shaped valley as a boundary. Further, the second embossing projection 5b can secure a gap between the outer surface of the first filtering surface 3 and the outer surface of the second filtering surface 4 for fluid passage. In this case as well, regardless of the presence or absence of the second projecting projection 5b on the outer surface of the first filtering surface 3, even if the second projecting projection 5b is formed on the outer surface of the narrow second filtering surface 4, it is the same. The purpose of can be achieved. Further, even if the number of the first and second filtering surfaces 3 and 4 is increased, the folds between the wide filtering surface 3 and the narrow filtering surface 4 are formed by the first and second projecting protrusions 5a and 5b. The two pitches can be forcibly aligned, which makes it possible to take advantage of the characteristics of M-folding, which has a large filtration area. As a result, the filtration area of the filter medium can be substantially widened, and the trapping action of foreign matter contained in the fluid such as lubricating oil can be promoted.

[0016]

[Effect of the device]

 The invention is to bend a sheet-shaped filter medium in a bellows shape with a large number of parallel folds to alternately arrange a wide V-shaped first filtering surface and a narrow V-shaped second filtering surface. In addition, in a cylindrical filter element formed by joining both ends of the filter medium, a first projecting protrusion is formed on the inner surface of the wide V-shaped filter surface, and the wide V-shaped filter surface Since the second projecting protrusion is formed on at least one of the facing surfaces of the outer surface and the outer surface of the narrow V-shaped filtering surface, the wide V-shaped first filtering surface and the narrow V-shaped filtering surface are formed. The filtration area can be widened by alternately arranging the second filtering surface of the V-shape, and the narrow V-shaped second filtering surface has a short crease interval, so that the strength of one's waist is strong. The open V-shape is maintained, which results in the V-shape of the second filtration surface. It is possible to secure a clearance for the fluid to pass through to the inner surface of the filter, and to secure a clearance for the fluid to pass through to the inner surface of the first filtration surface by the first ejection projection. A gap can be secured between the outer surface of the first filtration surface and the outer surface of the second filtration surface to allow fluid to pass through. Furthermore, even if the number of arrays of the first and second filtration surfaces is increased, With the first and second ejection protrusions, the pitch of the folds between the wide filtration surface and the narrow filtration surface can be forcibly aligned, which substantially enlarges the filtration area of the filter medium to form a fluid. It has the effect of promoting the trapping action of foreign matter contained therein and prolonging the life of the filter element.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a filter medium according to an embodiment of the present invention.

FIG. 2 is a partial plan view showing a state where the filter medium is bent into a cylindrical shape.

FIG. 3 is a cross-sectional view showing how the filter element of the present invention is mounted on a filter device.

FIG. 4 is a vertical cross-sectional side view showing a mounting state of the filtering device on an engine.

FIG. 5 is a perspective view of a filter element in a first conventional example.

FIG. 6 is a perspective view of the filter medium.

FIG. 7 is a plan view showing a state in which the filter medium is bent into a cylindrical shape.

FIG. 8 is a perspective view of a filter medium in a second conventional example.

FIG. 9 is a plan view showing a state where the filter medium is bent into a cylindrical shape.

FIG. 10 is a perspective view of a filter medium in a third conventional example.

FIG. 11 is a partial plan view showing a state where the filter medium is bent into a cylindrical shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter material 2 Fold line 3 1st filtration surface 4 2nd filtration surface 5a 1st ejection protrusion 5b 2nd ejection protrusion

Claims (1)

[Scope of utility model registration request] 1. A wide V-shaped first filtering surface and a narrow V-shaped second filtering surface are alternately arranged by bending a sheet-shaped filter medium in a bellows shape with a large number of parallel folds. In addition, in the cylindrical filter element formed by joining both ends of the filter medium, the first projecting protrusion is formed on the inner surface of the wide V-shaped filter surface and the outer surface of the wide V-shaped filter surface is formed. A filter element characterized in that a second embossing projection is formed on at least one of the surfaces of the narrow V-shaped filtering surface facing the outer surface.