JPH0113523Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in cartridge-type oil filters for internal combustion engines.

As shown in FIG. 1, a cartridge type oil filter 10 houses a filter element 3 in a cup-shaped casing 1 having an open end 2. The open end 2 is connected to a raised part 5 having a screw hole 4. A cover plate 6 having a plurality of oil inlets 7 bored therein and a cover plate 8 are closed by a fixed cover body 9, and the cover plate 8 and the peripheral edge 11 of the casing 1 are crimped together in a fluid-tight manner. It is. The lid 9, which is made by joining the lid 6 and the cover plate 8 in the circle frame in FIG. The lid plate 6b and the cover plate 8 are fixed by so-called projection welding, in which the protrusion 12b and the cover plate 8 are heat-sealed and joined by energizing the cover plate 6b and the cover plate 8 while clamping them from above and below with a jig. However, in this case, as shown in FIG.
The melted portion flows between the lid plate 6b and the cover plate 8, that is, there is no escape for the melted portion of the protrusion 12b, so it flows between the lid plate 6b and the cover plate 8 and solidifies as shown by the broken line hatching, as shown in FIG. As shown in (c), a gap t is created between the lid plate 6b and the cover plate 8 around the joint portion 13b. As shown in FIG. 1, when the seal packing 14 is inserted into the cover plate 8, the oil filter 10 is fastened to the stud bolt 15 installed upright on the engine block E, and the internal combustion engine (not shown) is rotated. The oil with pulsating pressure passes through the filter element 3 from the oil inlet 7 and returns to the oil outlet 16, where pressure is applied in the direction shown by the broken line arrow in FIG. 1 and the pressure is increased in the space 17 shown in FIG. acts.

The cover plate 6 shown in FIG. 1 has a sufficient thickness to withstand the pressure and is fixed to a stud bolt 15 installed upright on the engine block E, so it does not vibrate in response to the pulsating pressure. 8 is made of a thin plate, and in the case of FIG. 2C, the cover plate 8 is subjected to an oscillating action vertically in the figure, with the joint 13b as a support point, and a repetitive load acts on the joint 13b. The relationship between the gap between the lid plate 6b and the cover plate 8 and the fracture strength of the joint 13b is such that the larger the gap t is, the stronger the joint 13b becomes.
If the joint 13b is weak and a crack occurs, the oil under hydraulic pressure will flow from the crack to the seal packing 14.
It has the disadvantage that it passes through and leaks to the outside.

The present invention is intended to solve this drawback, and is a joint in which the cover plate is welded to the protrusion of the cover plate, which has a concave groove on the outer periphery of the protrusion similar to that of conventional products, on the cover plate surface on the cover plate side. Embodiments will be described below with reference to the drawings.

The cover plate 6a in FIG. 3A is the cover plate surface 18 on the cover plate 8 side.
, a plurality of protrusions 12a having grooves 19 on the outer periphery.
When the lid plate 6a and the cover plate 8 are welded, for example by projection welding, in the same way as the conventional product, the melted portion of the solid line hatching of the protrusion 12a flows into the groove 19, as shown in FIG. 3B. The fluid flows, and the diameter portion of the groove 19 forms the joint 13 as shown in FIG. 3C.
a, and the flat surfaces of the lid plate 6a and the cover plate 8 other than the joint portion 13a are in close contact with each other. If the gap between the lid plate 6a and the cover plate 8 is extremely small in this way, the strength of the joint 13a will be very high as shown in FIG. 4, and no cracks will occur.

As explained above, in the present invention, a groove is provided on the outer periphery of the protrusion of the cover plate, and the protrusion and the cover plate are welded together, so that the melted portion of the protrusion flows into the groove. , pressure is no longer applied to the cover plates other than the joints, and oil leakage to the outside due to cracks in the joints is eliminated. Moreover, since the shape of the lid plate is simply changed, the cost is low and the quality is improved.

[Brief explanation of drawings]

Figure 1 is an explanatory partial vertical cross-sectional view of the oil filter, Figure 2 A, B, and C are enlarged explanatory views of the conventional round-framed product in Figure 1, and Figure 3 A, B, and C are Figure 1. Figure 4 is an explanatory enlarged view of the round frame device, and is a diagram showing the relationship between strength and gap. DESCRIPTION OF SYMBOLS 1... Casing, 2... Open end, 3... Filter element, 4... Screw hole, 5... Standing part, 6, 6a, 6b... Cover plate, 7... Oil inlet, 8... Cover plate, 9...Lid, 10...Oil filter, 11...Periphery, 12a, 12b...
Projections, 13a, 13b...joint parts, 18...cover plate surface, 19...concave grooves.

Claims (1)

[Scope of utility model registration request] A filter element is housed in a cup-shaped casing having an open end at one end, and the open end is connected to a cover plate having an oil inlet formed around a raised portion having a screw hole, and a cover plate having an oil inlet formed around a raised portion having a screw hole, and In a cartridge-type oil filter, the cover plate is closed with a lid body formed by joining a cover plate disposed on the casing, and the outer periphery of the cover plate and the periphery of the open end of the casing are fluid-tightly crimped. A cartridge-type oil filter having a joint portion in which a lid plate having a lid plate and a lid plate are tightly welded and a concave groove stores the melted material of the lid plate.