JPS6129764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to an improvement in an oil filter having a spiral type element and a method for manufacturing the same.

The oil filter that is the object of the present application has a spiral type element built into a cylindrical casing. A spiral type element is made by stacking a flat plate material and a corrugated plate material, alternately sealing both ends thereof, and winding them in a spiral shape around a central cylinder. When an element with such a structure is installed in a cylindrical casing, in the conventional case, an adhesive is applied to the outer circumferential surface of the element or an adhesive is applied to the inner circumferential surface of the casing. The purpose was to fill the gap between the two and ensure a seal. However, such a device has the disadvantage that the adhesive layer is not uniform, and the force applied to the element causes the adhesive layer to peel off, impairing the sealing performance.

The present application provides an oil filter and a method for manufacturing the same that improve upon such drawbacks.

To explain the filter of the present invention and its manufacturing method using an example, FIG. 1 shows a filter of the present invention in which a spiral-shaped element 1 is housed in a cylindrical casing 2 having an open end.
As shown in FIGS. 2 and 3, the spiral type element 1 consists of a flat paperboard 3 and a corrugated paperboard 4 formed by corrugating the same and having alternating peaks 4a and troughs 4b. and the trough 4b at the other end are filled and sealed with adhesive 15a, 15b, which are wound around the central cylinder 5, and the terminal end is secured.

A large number of over-chambers 13 are formed between the flat paperboard 3 and the corrugated paperboard 4. Such a spiral element 1 is inserted into the casing 2 so as to be inscribed in the inner peripheral surface of the casing 2, and has a screw hole 6 in the center and a plurality of openings 7 around the screw hole 6.
The open end is closed by a cover plate 8 having a thickness in which a hole is formed. The outside of the lid plate 8 is covered with a thin cover plate 9, and the outer periphery of the cover plate and the periphery of the open end are rolled seamed 10. Furthermore, the filter housing the spiral element 1 is formed by bead processing from the outside of the cylindrical casing 2 to form one or more annular grooves (an annular protrusion when viewed from the inside of the casing).
11 is formed, and a groove corresponding to the groove 11 is similarly formed on the outer peripheral surface of the element. As a result, the element made of fibrous paper and having elasticity is held in the casing 2 in a state where it is pressed toward the groove on the inner peripheral surface of the casing 2.

The dust-containing oil flows from the opening 7 of the cover plate 8 and enters the overchamber 13 from the inlet surface 12 of the spiral type element 1.
circulate within. Next, the dust-containing oil flows through the flat plates and corrugated paperboards 3 and 4, during which dust is removed, reaches the outlet surface 14 of the element, rises inside the central cylinder 5, and passes through the threaded hole 6 of the cover plate 8 to the lubricating section of the engine ( (not shown). In the above dust-containing oil inflow dust removal process, the dust-containing oil flowing through the gap between the outer circumferential surface of the element and the inner circumferential surface of the casing,
The annular groove 11 prevents the paper from moving straight, and the paper around the outer periphery of the element is circulated and cleaned. The spiral element 1 within the cylindrical casing 2 is also held resiliently in place by the annular groove 11. In the above manufacturing process, when inserting the spiral element into the cylindrical casing, the annular groove that makes insertion difficult is not yet formed in the cylindrical casing, so that the spiral element can be inserted smoothly.

As described above, the oil filter of the present invention can ensure a seal between the outer circumferential surface of the spiral element and the circumferential surface of the inner cylinder casing without using adhesive means. Further, since the element is elastically held within the cylindrical casing, no holding means such as a spring is required. Furthermore, the manufacturing method of the present invention does not involve inserting a spiral element into a cylindrical casing that has been bead-processed in advance; instead, the spiral-shaped element is integrated with the casing and then bead-processed to form an annular groove. Therefore, the difficulties associated with the insertion of the element do not occur, and efficient production is possible.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the oil filter of the present invention, Figure 2 is a sectional view of the oil filter of the present invention.
The figure shows how the spiral type element is created, and FIG. 3 is a partially enlarged view of FIG. 1. 1... Spiral type element, 2... Cylindrical casing, 11... Annular groove.

Claims (1)

[Scope of Claims] 1. A spiral-shaped element that forms a number of channels, one end of which is open and the other end of which is closed, is housed in a cylindrical casing that has an open end, and has a screw hole in the center. In the oil filter, the open end is closed by a cover plate having a plurality of openings bored therearound, a cover plate is disposed from the outside of the cover plate, and the cover plate is roll seamed with the periphery of the open end to integrate the cylindrical casing. An oil filter having a spiral type element formed by forming one or more annular grooves on an outer circumferential surface and sealing a gap between the inner circumferential surface of the casing and the outer circumferential surface of the element. 2. Wrap the material around a central cylinder to form a spiral element with one end open and the other end closed, insert this into a cylindrical casing with an open end to make it inscribed, and insert a screw in the center. The open end is closed with a cover plate having a hole and a plurality of openings around the cover plate, and a cover plate is provided from the outside of the cover plate, and is integrated with the periphery of the open end by roll seaming, and then A method for manufacturing an oil filter having a spiral type element, which comprises a step of subsequently forming an annular groove on the outer peripheral surface of the casing.