JPH0135211Y2 - - Google Patents

Description

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

The throw-away type oil filter has
Do not use upper or lower end plates for the filter element.
There is one that uses a filter element whose top and bottom are sealed with adhesive (usually referred to as a pocket type) and is wound around an inner tube.

FIG. 5 is an explanatory sectional view of the oil filter F of the conventional example disclosed in British Patent No. 978517. (For convenience of explanation, the same numbers are used for parts common to the invented product.) The oil filter F has a filter 3 (commonly known as a pocket type) in which the upper and lower parts of chrysanthemum-shaped folded paper are sealed with adhesive to form adhesive parts 2, 2, inside a cup-shaped casing C, and a filter 3 (commonly known as a pocket type) with a large number of small holes 4. A filter element 6 wound around a cylindrical inner tube 5 that is open at the top and bottom is housed, and the open end 7 of the casing C is connected to the central raised part 8 by a female screw 9.
The outer periphery of the cover plate 12 fixed on the outside of the cover plate 10 and the periphery 13 of the open end 7 are sealed with a cover plate 10 having a plurality of openings 11 bored therearound. Closely seamed, and said filter element 6 has a plate spring S having a thin plate portion D, an annular shoulder portion A, an annular flange 16 and an annular seal portion 17 on the inside of the closed end B of the casing C as shown. The clamping pressure is set by a valve V having a diameter. The closed end B is connected to the annular shoulder portion A of the plate spring S,
The end of the inner tube 5 of the filter element 6 and the inner periphery of the adhesive part 2 of the filter 3 are bonded, and the annular seal part 17 of the valve V is attached to the cover plate 10 side.
Similarly to the above, the end of the inner tube 5 and the inner periphery of the adhesive portion 2 of the filter 3 are bonded.

However, in this oil filter F, the filter element 6 is pressed by the elastic force of the plate spring S to cope with the deflection due to the compression set of the valve V, so the plate spring S is an essential requirement.
This has the disadvantage that a plate spring S, which has a constant spring pressure and is relatively difficult to manufacture, must be installed internally.

The present invention solves the drawbacks in view of the above, and the closed end side of the casing is provided with a plurality of annular concave and convex portions from the outside toward the inside to form a bellows. The bulb has an annular inner end portion and a hollow portion on the cover plate side, and the inner circumferential end portion of the filter element is adhered to each valve.Examples will be described below with reference to the drawings.

Figures 1 to 4 show the oil filter 20 of the present invention.
FIG. The only difference between the oil filter 20 and the conventional oil filter F is that the closed end 25 (B for the conventional product) of the casing 1 (C for the conventional product) and the valve 15 (V for the conventional product) are all else the same. . That is, as shown in FIGS. 1 and 2, the oil filter 20 of the present invention has a pocket-type filter 3 placed around the outer periphery of a porous cylindrical inner tube 5 inside a cup-shaped casing 1 having an open end 7 on one side. A filter element 6 wound in a chrysanthemum shape is housed, and the open end 7 is closed with a lid plate 10 having a female thread 9 screwed into the central raised part 8 and a plurality of openings 11 bored around it. The outer periphery of the cover plate 12 fixed on the outside of the cover plate 10 and the open end 7
The closed end 25 side of the casing 1 has a plurality of annular recesses 2 extending from the outside to the inside (as shown in FIG. 3) and inward.
2. Providing the convex portion 23 to form the bellows 26, and bonding the inner end annular portion 24 of the bellows 26 and the inner peripheral end 21 of the adhesive portion 2 of the filter 3 (including the end of the inner tube 5); Between the cover plate 10 and the filter element 6, there is provided a valve 1 made of rubber, for example, consisting of an annular flange 16, an annular seal part 17, a pressing part 18, and a hollow part 19 as shown in FIG.
5 are arranged. Note that the annular flange 16 of the valve 15 is connected to the opening 1 of the cover plate 10 as shown in FIG.
1, and the annular seal portion 17 is bonded to the inner circumferential end 21 of the adhesive portion 2 (including the end of the inner tube 5). Note that a gasket 14 is fitted onto the cover plate 12.

Next, the operation of the oil filter 20 will be explained.

For example, in an engine or a housing having an oil inflow hole (not shown) and an outflow pipe with a male thread for mounting, the female thread 9 provided on the cover plate 10 of the oil filter 20 is connected to the gasket 14 fitted on the cover plate 12. The oil is screwed on to prevent oil from leaking, and when the engine is rotated, oil is pressurized and sent out by an oil pump (not shown), and flows into the annular flange 16 of the valve 15 through a plurality of openings 11 formed in the cover plate 10. Push up and remove filter element 6.
Flow into the side. The oil then passes through the filter 3 from all around the filter element 6 and from above and below.
Only the purified oil passes through the small hole 4 of the inner tube 5 and is sent to the sliding parts of the engine from the outflow pipe (not shown).

In this case, the pressure of the pressurized oil is
Until the annular flange 16 of 5 is pushed up, the lid plate 1
The oil that flows in from the opening 11 acts on the pressing part 18 that is in contact with the inside of the rising part 8 of the valve 10 and presses the pressing part 18 against the back surface of the lid plate 10, passing between the valve 15 and the lid plate 10. filter element 6
There is no direct distribution to the clean side. The filter element 6 has one end bonded to the inner end annular portion 24 of the elastic bellows 26 and the inner peripheral end 21 of the filter 3, and the other end bonded to the annular seal portion 17 of the valve 15 and the inner peripheral end 21 of the filter 3. It is glued to the inner peripheral end 21, and when assembled to the casing 1, the cover plate 1
0, the cover plate 12 fixed to the cover plate 10 is seamed liquid-tightly with the peripheral edge 13 of the casing 1, so the valve 15 is pressed by the elastic force of the bellows 26 and the tightening force during assembly. The portion 18 and the hollow portion 19 are pressed and deformed. Since the hollow portion 19 freely deforms in response to the vibration load and the pressing force during assembly, the valve 15 does not suffer from compression set.

As described above, the present invention forms a bellows by providing the closed end side of the casing with a plurality of annular concave and convex portions from the outside toward the inside and inward, and the inner end annular portion of the bellows and The valve, which has a hollow part and is placed between the lid plate and the filter element, is bonded to the inner circumferential end of the filter element, making it possible to cope with the compression set of the valve without using a set spring. have an effect.

[Brief explanation of drawings]

Figures 1 to 4 relate to the present invention.
The figure is a partial vertical cross-sectional view, Figure 2 is a partial cross-sectional plan view, Figure 3 is an enlarged view of the main part of the closed end, Figure 4 is an enlarged cross-sectional view of the main part of the valve, and Figure 5 is a conventional product. Longitudinal cross-sectional view. 6... Filter element, 10... Lid plate, 15,
V... Valve, 19... Hollow part, 20, F... Oil filter, 21... Inner peripheral end, 22... Concave part, 23... Convex part, 24... Inner end annular part, 25, B... Closed end, 26...
Bellows.

Claims (1)

[Scope of utility model registration request] A filter element in which a pocket-type filter is wound in a chrysanthemum pattern is housed in a cup-shaped casing that has an open end on one side around the outer periphery of a porous cylindrical inner tube, and the open end is connected to a female thread in the central raised part. The oil is closed by a cover plate which is screwed and has a plurality of openings around it, and the outer periphery of the cover plate fixed on the outside of the cover plate and the periphery of the open end are seamed in a liquid-tight manner. In the filter, the closed end side of the casing is directed from the outside to the inside and inward,
A bellows is formed by providing a plurality of concave and convex portions in an annular shape, and a valve having an annular inner end portion of the bellows and a hollow portion disposed between the lid plate and the filter element is attached to the inner circumferential end of the filter element. A springless oil filter characterized by being bonded with.