JPH0346819Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a filter element, and more particularly to a filter element equipped with a relief valve.

<<Prior Art>> Impurities are constantly filtered from lubricating oil such as engine oil through an oil filter, and the purified oil is used. The oil filter is generally constructed by housing a filter element in a case, and the filter element is divided into a primary side (dirty side) and a secondary side (clean side) inside the case, and the oil flows through the filter element. It is designed to pass through filter paper.

By the way, if the filter paper of the filter element becomes clogged after long-term use, the amount of oil supplied will be insufficient. Some are equipped with a relief valve that allows communication between the side and the secondary side.

<<Problems to be solved by the invention>> However, in the case of a filter element having such a conventional relief valve, a coil spring is used to bias the valve body of the relief valve in the valve closing direction. Since the coil spring itself requires a certain length in the axial direction, there is a problem in that the relief valve and, in turn, the filter element are forced to be larger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a filter element that is designed to reduce the size of the relief valve and to simplify assembly by devising a biasing means for the valve body.

<Means for solving the problem> In order to achieve the above object, the filter element of the present invention has an annular valve housing fitted around the inner periphery of a cylindrical filter paper, and is movable to the center of the valve housing. At the same time, the valve body is attached to the valve housing via a leaf spring, and the inner peripheral part of the element presser spring is caulked and fixed to the outer end of the filter paper of the valve housing. The caulked and fixed portion of the valve body forms a valve seat of the valve body.

<<Operation>> With the above-described configuration, in the filter element of the present invention, the relief valve is composed of the valve housing, the valve body, and the leaf spring, and the leaf spring is used as the biasing means for the valve body. As a result, the axial length of the relief valve is significantly reduced. For this reason,
A reduction in the size of the relief valve will be achieved. In addition, since the element presser spring is caulked and fixed to the valve housing, the element presser spring and the relief valve can be assembled in advance as an integral unit, which greatly improves work efficiency when assembling the filter element. That will happen.

<<Example>> Hereinafter, an example of the present invention will be described in detail based on the drawings.

That is, FIGS. 1 and 2 show a filter element 10 showing an embodiment of the present invention, and this filter element 10 is provided with a filter paper 12 which is bent into a bellows shape and then wrapped around in a cylindrical shape. A reinforcing cylinder 14 formed of a punching plate is attached to the inner circumferential portion of the filter paper 12, and the space between the inside of the bellows-folded portion and the reinforcing cylinder 14 at both ends of the filter paper 12 is closed by direct coating or adhesive. It is becoming more and more common. A relief valve 16 is provided at the upper end of the reinforcing cylinder 14 to open and close the primary side on the outside of the filter paper 12 and the secondary side on the inside of the filter paper 12. A lower end plate 18 having a smaller diameter than the outer diameter of 12 is provided. The relief valve 16
The annular valve housing 20 is fitted onto the inner periphery of the lower end of the reinforcing cylinder 14, and the valve body 22 is movably disposed in the center of the valve housing 20.
and a leaf spring 24 interposed between the valve body 22 and the valve housing 20. The inner periphery of a flange 26a of an element presser spring 26 provided at the upper end of the filter paper 12 is caulked and fixed to the upper end of the valve housing 20, and the outer periphery of the flange 26a is formed on the outer periphery of the filter paper 12. It is formed to have a smaller diameter than the diameter of the upper end plate, so that it functions as an upper end plate. The lower end of the caulked portion 20a of the valve housing 20 to which the element presser spring 26 is fixed serves as a valve seat 28. The valve body 22 has an annular flange 22a with a center portion protruding downward, and is formed into a substantially inverted umbrella shape.
The upper peripheral edge of the flange 22a is seated on the valve seat 28 in a liquid-tight manner, and the protrusion 2 in the center
2b is adapted to be fitted onto the leaf spring 24. As shown in FIG. 3, the leaf spring 24 has a ring-shaped outer frame 24a,
Attachment hole 2 into which the protrusion 22b of the valve body 22 is fitted
4b is formed, and these outer frames 24
a and an arcuate spring portion 24d connecting the inner frame 24c, and the outer frame 24a, the inner frame 2
4c and the spring portion 24d are integrally formed by punching out a single spring plate material. The outer frame 24a is secured to the upper side of the small diameter portion formed by bending the lower end of the valve housing 20 upwardly inwardly, and the valve body 22 fitted into the mounting hole 24b of the inner frame 24c is attached to the spring portion 24b. Therefore, it is pressed upward (in the valve closing direction). In addition, in such an assembled state of the relief valve 16, the inner frame 24c is positioned below the outer frame 24a with the valve body 22 in contact with the valve seat 28, and the initial Pressure is on valve body 2
It is acting on 2.

The filter element 10 having such a configuration is arranged so that the outer tip of the bellows-folded portion of the filter paper 12 is brought into contact with the inside of the case 30.
The oil stored in the filter paper 12 and taken in from the bottom in the figure passes between the outside of the bellows-folded portion of the filter paper 12 and the case 30 and moves upward, passing through the filter paper 12 from the outside to the inside and being filtered. This filtered oil passes through the reinforcing cylinder 14 and is discharged from the bottom in the figure. Note that when the filter element 10 is housed in the case 30, the filter element 10 is urged downward by the element presser spring 26 that comes into contact with the upper side of the case 30, so as to prevent rattling. It's summery.

By the way, if the filter paper 12 becomes clogged during this filtration action and the oil passage resistance increases, the pressure difference between the primary side and the secondary side will inevitably increase. Then, the valve body 22 is moved downward against the pressing force by the spring portion 24d of the leaf spring 24, and a gap is generated between the valve body 22 and the valve seat 28, which causes the relief valve to close. 16 is opened, and the oil on the primary side flows into the reinforcing cylinder 14 through this gap. Therefore, the relief valve 1 prevents insufficient passage of oil due to clogging of the filter paper 12.
This can be compensated for by opening the valve in step 6, and it is possible to prevent seizure or wear due to insufficient lubrication.

In this way, in this embodiment, the leaf spring 24 is used as a means for biasing the valve body 22.
Even if the leaf spring 24 is initially pressed, the axial dimension of the leaf spring 24 is significantly reduced, and therefore the relief valve 16 itself can be made smaller. Further, since the element presser spring 26 is caulked and fixed to the valve housing 20 of the relief valve 16, the element presser spring 26 can be assembled to the relief valve 16 in advance, and the filter element 10
The work efficiency during assembly will be greatly simplified.

In this embodiment, the valve body 22 is fitted onto the leaf spring 24 through the protrusion 22b, but the present invention is not limited to this, and other mounting means may be used. 4. As shown in Figure 4, attach the valve body 22 and leaf spring 24 with rivets 3.
It may be made to have two stops.

<<Effects of the invention>> As explained above, in the filter element of the present invention, a leaf spring whose axial dimension is significantly reduced is used as a biasing means for the valve body, so that the relief valve can be made smaller. This makes it possible to reduce the size and weight of the filter element. Furthermore, by caulking and fixing the element presser spring to the valve housing, the element presser spring can be pre-assembled when assembling the relief valve, thereby significantly improving work efficiency when assembling the filter element. It has various excellent effects.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing the assembled state of a filter element which is an embodiment of the present invention, Fig. 2 is a cross-sectional view of a main part of an embodiment of the present invention, and Fig. 3 is a cross-sectional view of a main part of the filter element used in the present invention. Enlarged plan view of leaf spring, 4th
The figure is an enlarged sectional view showing another embodiment of the attached state of the valve body and leaf spring according to the present invention. 10...filter element, 12...filter paper,
16... Relief valve, 20... Valve housing, 20a... Caulking part, 22... Valve body, 2
4... Leaf spring, 26... Element presser spring, 28... Valve seat.

Claims (1)

[Scope of utility model registration request] An annular valve housing is fitted onto the inner periphery of a cylindrical filter paper, a valve body is movably disposed in the center of the valve housing, and the valve body is attached to the valve housing via a leaf spring,
A filter element characterized in that an inner peripheral portion of an element presser spring is caulked and fixed to the outer end of the filter paper of the valve housing, and a valve seat of the valve body is formed by the caulked portion of the valve housing.