Filter and manufacturing method therefor

Abstract

The present invention provides a filter capable of suppressing the detachment of a filter element at the time of using the filter and suppressing the generation of foreign matters such as welding burrs inside a filter chamber. This filter 1 is provided with a first case member (upper case member 12) and a second case member (lower case member 13) forming the filter chamber S by being abutted to each other, and the filter element 14 held between the respective abutting end parts 121 and 131 of the first case member and the second case member. The first case member is laser transmissible, the second case member is laser absorptive and a welding part W1 for the element by a laser beam is formed on the outer side face side of the contact part of the abutting end part of the second case memberand the filter element.

Description

technical field [0001] The present invention relates to a filter and a manufacturing method thereof, and more specifically, to a filter capable of suppressing drop-off of a filter element and suppressing foreign matter such as welding burrs in a filter chamber during use of the filter and a manufacturing method thereof. Background technique [0002] In the past, as an oil filter for an automatic transmission, it is known that a filter element (for example, Refer to Patent Documents 1 and 2). [0003] In the above-mentioned Patent Document 1, a technique is disclosed in which the filter material 3 is compressed and fastened by the respective inner edge protrusions 1d and 2d of the upper case 1 and the lower case 2 . However, in this patent document 1, since only the filter material is compressed and fastened, when a high internal pressure is applied when the oil filter is used, the filter material may fall off. [0004] In addition, the aforementioned Patent Document 2 disc...

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Problems solved by technology

[0007] However, in Patent Document 3, since the laser beam is irradiated from the pressurizing direction of the filter element, the welded part B2 is formed in the filter chamber of the casing, so due to the output of the laser light, etc., the gap between the inner wall of the casing and the edge of the filter element Foreign matter such as welding burrs may occur in the gap and the slit of the jig, and the foreign matter may remain in the filter chamber and may deteriorate the performance of the product as a filter

In addition, in order to suppress the occurrence of foreign matter such as welding burrs in the gap between the inner wall of the housing and the edge of the filter element, when the welding part is arranged at a position sufficiently far from the gap, the outside of the welding part on the housing The size of the square side becomes larger, and there is a problem that the size of the entire filter becomes larger

[0008] In addition, in the above-mentioned Patent Document 3, since the laser beam is irradiated through the slit of the fastening jig, it is difficult to secure a necessary and sufficient welded width on the welded portion.

In addition, when the slit width of the fastening jig is set to a relatively large value in order to ensure a necessary and sufficient welding width, the pressure exerted by the fastening jig on the filter element becomes weak, and the fiber density of the welding part decreases. , it is difficult to achieve reliable deposition

[0009] In addition, in the above-mentioned Patent Document 3, since it is necessary to transmit the laser light through the filter element, it is necessary to use a filter element having laser light transmittance.

[0010] In addition, in the above-mentioned Patent Document 3, since the edge portion of the filter element is exposed in the filter chamber, there is a possibility that the performance of the product may deteriorate due to the fiber etc. Adjustment so that the molten laser absorbing material saturates the entire thickness of the filter element and solidifies it. It is necessary to have a subtle adjustment function of the heat of laser irradiation that takes into account factors such as fluctuations in transmittance.

[0011] Furthermore, as a filter element, in order to enlarge the filtering surface, a pleated filter element is sometimes used, but the pleated portion becomes a complicated three-dimensional shape. Therefore, the laser cannot be irradiated vertically to the melting member (case member) on the absorption side, and the melting member cannot be reliably melted.

Furthermore, since it is difficult to adjust the focal length of the laser to the welded part along the wrinkled part, there is a risk of non-welded parts and over-welded parts (material charred parts)

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