JPH053325B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a filter element for an internal combustion engine air cleaner, etc., and a method for manufacturing the same.

(Prior Art) The present applicant proposed a filtering element installed in an air cleaner for an internal combustion engine in Japanese Patent Application No. 62-191019 (Japanese Patent Application Laid-Open No. 64-85110). An example is shown in FIG. The filter element 1 has a cap-shaped filter body 2 made of radially pleated filter media placed on struts 11 along the conical surface of a support body 3, and an annular groove 12 on the upper part of the support body and an inner circumference of the filter body 2. An upper seal packing 4 is provided across the upper end edge 15a of the end surface 15, and the lower end edge 16 of the outer peripheral end surface 16 of the filter body 2 is provided.
A lower seal packing 5 is provided astride the lower support ring 13 of the support body 3. 14 is the top plate of the support. As shown in FIG. 3, the filter body 2 is made of a filter material that is folded radially along pleat ridge lines 17 and pleat valley lines 18, and near the inner peripheral end face 15, the valley lines 18
The bottom of the valley near the bottom is in close contact with the outer peripheral end surface 16.
Nearby, the mountain top portion close to mountain line 17 is brought into close contact with the inside. By sealing the upper edge 15a of the inner circumferential end surface 15 and the lower edge 16a of the outer circumferential end surface 16, the inner circumferential end surface 15 forms a flow path on one side along with the lower surface of the pleats, for example, and the outer circumferential end surface 16 forms the other side with the upper surface of the pleats. For example, it becomes a flow path on the dust stay side.

To manufacture this filtration element 1, the above-mentioned support 3 is integrally molded from a synthetic resin, and the cap-shaped filter 2, in which the filter material is folded radially, is placed on the struts 11 of the support 3, and then The lower lower mold 30 having an annular groove 30a is brought into contact with the lower surface of the lower support ring 13, and the foamable synthetic resin stock solution is injected into the groove 30a of the lower mold 30 and the annular groove 12 of the support 3. The lower upper mold 31 is placed on the mold 30, and the annular groove 12 and the filter body 2 are placed on the mold 30.
An upper mold 32 is placed over the upper end edge 15a, and the foamable synthetic resin stock solution is foamed and solidified to form the lower seal packing 5 and the upper seal packing 4.

(Problems to be Solved by the Invention) When forming the upper seal packing of the above-mentioned filtration element, it is necessary to inject an appropriate amount of foamable synthetic resin stock solution into the annular groove of the support, but the composition of the stock solution is Since the foaming state differs depending on the temperature and temperature conditions, it is extremely difficult to control the amount of stock solution injected to form an upper seal packing with an appropriate shape and appropriate apparent density, and the shape is likely to be abnormal.

For this reason, in the conventional filter element, as shown in FIG. 5, a thin part A occurs in the upper seal packing 4 and the upper end edge 15a of the filter body 2 cannot be completely covered, resulting in incomplete sealing, and as shown in FIG. An excessively large bulge B is formed in the upper seal packing 4, and the filtering surface is blocked.

(Means for Solving the Problems) The filtration element of the present invention has an auxiliary groove provided inside the annular groove of the upper support ring of the support body,
The upper seal packing spans the annular groove and the upper edge of the filter body like the conventional one, and a part of it bulges into the auxiliary groove, and the other parts are the same as the conventional one. It's the same.

In addition, in order to manufacture this filter element, when molding the upper seal packing, an amount of foamed synthetic resin is placed in the annular groove of the upper support ring, spanning the upper edge of the filter body, and in an amount sufficient to bulge into the auxiliary groove. The stock solution is injected, and the foam is solidified so that the expansion caused by foaming reaches the inside of the auxiliary groove. Other steps are the same as the conventional manufacturing method.

(Function) Even if there is some variation in the amount and composition of the stock solution in the upper seal packing or its foaming conditions, the filtration element of the present invention absorbs the variation in the amount of expansion due to foaming by accepting it into the auxiliary groove. If a sufficient amount of the stock solution is injected to prevent later underfilling, not only will the upper seal packing not be underfilled, but the excess will not bulge toward the filter body and reduce the filtration area.

In addition, since slight variations in the amount of stock solution injected into the upper seal packing are allowed during manufacturing, the quality of the stock solution, the amount of injection, foaming conditions, etc. can be easily controlled, and the production of defective products can be reduced.

(Example) FIG. 1 shows a filter element 20 of the present invention. The filter element 20 includes a filter body 2 and a support body 21
, an upper seal packing 22 and a lower seal packing 23. The filter body 2 is the same as the conventional filter body shown in FIG. The support body 21 has an annular groove 27 and an upper support ring 26 having an auxiliary groove 28 along the inside thereof.
The lower support ring 25 has an annular recess 25a that opens downward in the shape of a gutter, and a support 24 that connects the lower support ring 25 radially. The pillars 24 are connected to the upper support ring 26 at an almost vertical portion 24c of the upper part, and are arranged radially.The pillars 24 are bifurcated at the bottom to form a bifurcated pillar 24b, which is connected to the lower support ring 25. Branch pillar 24
A stepped portion 24a is provided at the tip of b to improve the molding of the lower seal packing 23.
The inside of the auxiliary groove 28 is covered with a top plate 29. The upper seal packing 22 is formed into an annular shape by foaming and solidifying a foamed urethane liquid, spanning the annular groove 27 and the upper end edge 15a of the filter body, and its inner peripheral side reaches into the auxiliary groove 28 due to expansion during foaming. The lower seal packing 23 is connected to the lower support ring 25 and the lower edge 16 of the filter body.
It is formed in an annular shape and is made of foamable urethane.

The method for manufacturing this filter element 20 is as follows. First, the above-mentioned support 21 is integrally molded from synthetic resin, and a separately molded and radially pleated filter body 2 as shown in FIG. 3 is placed on the pillars 24 of the support 21. do. Next, the lower lower die 30 having an annular groove 30a is brought into contact with the lower surface of the lower support ring 25, as in the conventional case, and the groove 30a and the support body 2 are brought into contact with each other.
A foaming urethane stock solution is injected into the annular groove 27 of No. 1 (Fig. 2 A), and then the lower upper mold 31 (Fig. 4) and the upper upper mold 33 (Fig. 2 B) are respectively covered, and inside the The urethane stock solution is foamed and solidified. As shown in FIG. 2B, the upper mold 33 has an annular shape, covering the annular groove 27, the inner edge 15a of the filter element 2, and the auxiliary groove 28. As shown in FIG. The amount of the foamable urethane stock solution injected into the annular groove 27 is determined by the amount of the foamable urethane stock solution injected into the annular groove 27 and the upper edge 15a of the filter body 2 when it foams and expands.
It is filled across the two sides, and some of it is in the auxiliary groove 2.
8 and is injected into the annular groove 27.

(Effects of the Invention) Since the present invention has the above-described configuration, the filtration element is prevented from having insufficient thickness in the upper packing to cause seal leakage, or to excessively bulge on the upper end surface of the filter body and blocking the filtration surface. The desired filtration function is ensured.

In addition, in this filter element, variations in the amount of expansion due to foaming during molding of the upper seal packing are absorbed by the auxiliary groove, so the amount of injection can be easily adjusted, and the occurrence of malfunctions or unsightly defective products can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a filter element according to an embodiment of the present invention, and FIGS. 2A and 2B are views showing the formation of the upper seal packing. FIG. 3 is a perspective view of a filter body, and FIG. 4 is a diagram showing a conventional filter element and molds for forming its upper and lower seal packings. FIGS. 5 and 6 are diagrams showing malfunctions of conventional upper seal packings. 2... Filter body, 21... Support body, 22... Upper seal packing, 23... Lower seal packing,
24... Pillar, 25... Lower support theory, 26... Upper support theory, 27... Annular groove, 28... Auxiliary groove, 3
0...Lower lower mold, 31...Lower upper mold, 33...Upper upper mold.

Claims (1)

[Scope of Claims] 1. A support having an upper support ring, a lower support ring, and a plurality of supports connecting these and extending along a conical surface, and a cap-shaped pleated filter placed on the supports of the support. , a filtration element comprising an annular upper seal packing extending from the upper support ring of the support body to the upper edge of the filter body, and an annular lower seal packing extending from the lower support ring to the lower edge of the filter body,
The upper support ring is a filtration element with an annular groove and an auxiliary groove along its inside. 2. On the strut of a support body comprising an upper support ring having an annular groove and an auxiliary groove along the inside thereof, a lower support ring provided below and outward from the ring, and a plurality of struts connecting these and extending along a conical surface. A cap-shaped filter body is placed on the lower support ring, a lower lower mold having an annular groove is brought into contact with the lower surface of the lower support ring, and the stock solution of the foamable synthetic resin material is poured into the annular groove of the upper support ring and the lower lower mold. Then, the annular groove, the auxiliary groove, the upper lid mold that covers the upper edge of the filter body, and the lower lid mold that covers the upper surface of the lower support ring are respectively covered, and the foamable synthetic resin stock solution is poured into the foamable synthetic resin material stock solution. A method for manufacturing a filtration element in which an upper seal packing is formed by foaming and solidifying the stock solution in an annular groove so that the expansion caused by foaming reaches the auxiliary groove.