JPH09112238A - Oil filter - Google Patents

Abstract

It is an object of the present invention to provide a lightweight and inexpensive oil filter with a reduced number of parts. An oil filter (20) accommodates a cylindrical filter element (3) inside a housing (2) and closes the bottom of the housing (2) with a lid (1).
Is provided with an oil inlet 5 communicating with the outer peripheral portion of the filter element 3, an oil discharge cylinder 4 communicating with the inner peripheral portion of the filter element 3, and a check valve 6 for covering the oil inlet 5 from the inside of the housing 2. In the prepared one,
The upper end surface 3e of the filter element 3 is fixed to the upper surface portion 2a of the housing 2, the check valve 6 is provided between the lower end surface of the filter element 3 and the lid 1, and the check valve 6 is provided above and below the filter element 3. The notch 6e is provided so as to expand and contract following movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil filter in which a filter element is housed inside a housing.

[0002]

2. Description of the Related Art Conventionally, as a disposable oil filter, for example, there is one in which a filter element as a filter is housed in a cylindrical housing whose lower end opening is closed by a lid.

More specifically, as shown in FIG. 4, an oil filter 100 accommodates a cylindrical filter element 3 in a housing 2, and a screw portion is provided at the center of a lid 1 provided at the bottom of the housing 2. An oil discharge cylinder 4 having 4a is provided in communication with the inner peripheral portion of the filter element 3,
An oil intake 5 communicating with the outer peripheral portion of the filter element 3 is provided around the oil discharge cylinder 4.

The filter element 3 has a filter member 3c, which is folded and formed in a tubular shape, and a reinforcing bored inner cylinder 3d, and is fixed between the upper and lower end plates 3a and 3b. The lower end plate 3b is liquid-tightly fitted to the lid body 1 via the check valve 6.

By the way, in the oil filter 100 having such a structure, when the filter element 3 is clogged and the oil flow is deteriorated, the pressure due to the oil acts on the outer peripheral portion of the filter element 3, and this pressure causes There was the fear that the housing 2 would expand and loosen the fixation of the filter element inside it.

On the other hand, conventionally, a leaf spring 11 is provided between the upper end plate 3a of the filter element 3 and the upper inner side of the housing 2 to constantly urge the filter element 3 downward so that the housing 2 Measures have been taken to accommodate expansion.

[0007]

However, the oil filter 100 is of a disposable type, and when the internal filter element 3 is clogged, the entire housing 2, that is, the oil filter 100 is replaced. It is desirable that the structure be simple, lightweight, and inexpensive.

However, in the oil filter 100, as described above, it is necessary to provide the leaf spring 11 for fixing the filter element 3 in correspondence with the expansion of the housing 2, so that the number of parts is large and the weight and cost are low. There was a problem that it did not happen.

The present invention is intended to solve the above problems, and an object thereof is to provide a lightweight and inexpensive oil filter with a reduced number of parts.

[0010]

In order to achieve the above object, the oil filter of the present invention has a cylindrical filter element housed inside a housing, and the bottom of the housing is closed by a lid. An oil filter provided with an oil intake port communicating with the outer peripheral part of the filter element in the lid body, an oil discharge cylinder communicating with the inner peripheral part of the filter element, and a check valve for covering the oil intake port from the inside of the housing In, the upper end surface of the filter element is fixed to the upper surface portion of the housing, the check valve is provided between the lower end surface of the filter element and the lid, and the check valve is provided with a notch. The check valve is configured to expand and contract between the lower end surface and the lid body by following the vertical movement of the filter element.

According to the oil filter element having such a structure, since the upper end surface of the filter element is fixed to the upper surface of the housing, pressure is applied to the housing and the housing expands and is pushed outward. Accordingly, the filter element is pulled up. At this time, the check valve is provided with a cutout portion so that the check valve can expand and contract following the vertical movement of the filter element between the lower end surface of the filter element and the lid body. Even if the filter element moves upward, the sealing effect of the filter element can be reliably maintained and oil leakage can be prevented.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the oil filter of the present invention will be described below with reference to the drawings. FIG.
Shows an oil filter 20 according to this embodiment,
FIG. 2 shows the check valve 6 in an enlarged manner. FIG. 3 shows the lower end of the housing 2 in an enlarged manner. In the figure, the same parts as those in the conventional example are designated by the same reference numerals.

In FIG. 1, an oil filter 20 has a cylindrical filter element 3 as a filter in a bottomed cylindrical housing 2 whose lower end opening is closed by a lid 1.
And an oil discharge cylinder 4 having a screw portion 4a is arranged in the center of the lid body 1.
An oil intake 5 is provided around the oil discharge cylinder 4. A check valve 6 that covers the oil intake port from the inside of the housing 2 is provided at the oil intake port.

In the oil filter 20, the upper end surface of the filter element 3 is located at the upper surface portion 2 of the housing 2.
The check valve 6 is fixed to a and is provided between the lower end surface 3b of the filter element 3 and the one lid.

The outer peripheral edge of the lid 1 is bent downward to form a circular protrusion 12, and a winding end 14 at the lower end of the housing 2 is wound around the circular protrusion 12. A winding portion 13 is formed so that the lid 1 is liquid-tightly fixed to the housing 2. A packing 9 is held on the inner peripheral portion of the winding end 14. Further, as shown in FIG. 3, the circular projecting portion 12 is provided with a concave surface 15 on the entire circumference thereof or at an appropriate position thereof to enhance the adhesion strength between the housing 2 and the lid 1.

On the other hand, in the filter element 3, a lower end plate 3b is adhered to the lower end of a filter member 3c which is folded and formed in a cylindrical shape, and an inner cylinder 3d with a reinforcing hole is formed in the inner peripheral portion of the filter member 3c. And the upper end 3e thereof is directly connected to the upper surface 2a of the housing 2.
It is stuck to.

A relief valve 10 is provided inside the lower end plate 3b, and a spring 18 is provided between the support cylinder 16 and the valve body 17. A support plate 19 is fixed to the lower surface of the lower end plate 3b, and is fitted in a liquid-tight manner to the lid body 1 via the check valve 6 at the inner peripheral end portion 1a of the lid body 1.

As shown in FIG. 2, the check valve 6 has a valve body 6a for preventing backflow of the oil intake port, and a support guide portion 6b for the upper inner peripheral edge thereof. ..
A seal portion 6c of the filter element 3 is provided on the inner peripheral edge of the lower portion of the check valve 6, and a cut portion 6e is provided on the outer peripheral surface 6d of the seal portion 6c.

According to the oil filter 20 having the above structure, the dirty oil pushes up the valve body 6a of the check valve 6 from the oil intake port 5 and enters the outer peripheral portion of the filter element 3, and is filtered by the filter member 3c to be cleaned. Is discharged from the oil discharge cylinder 4 and supplied to the lubrication portion of the engine.

When the filter element 3 is clogged, the relief valve 10 is opened and the dirty oil flows out to the lubricating portion of the engine. Further, when oil flows into the housing 2 and internal pressure is applied to the housing 2 and the housing 2 expands, the upper portion 3e of the filter element 3 is directly fixed to the upper inner surface 2a of the housing 2, so that the filter element 3 Is pulled up. Along with this, the cutout portion 6e of the seal portion 6c of the check valve 6 below the filter element 3 is opened, so that the check valve 6 extends vertically.

More specifically, pressure is applied to the cut portion 6, and FIG.
As shown in FIG. 7, the notch 12e is further expanded, so that the sealing effect is sufficiently maintained even if the filter element 3 is pulled upward.

[0022]

As described above in detail with the embodiments, according to the oil filter of the present invention, since the upper end surface of the filter element is fixed to the upper surface of the housing, pressure is applied inside the housing and the housing expands. Then, the filter element is pulled upward as it is spread outward. At this time, the check valve is provided with a cutout portion so that the check valve can expand and contract following the vertical movement of the filter element between the lower end surface of the filter element and the lid body. Even if the filter element is moved upward, the sealing effect of the filter element is reliably maintained and oil leakage can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of an oil filter according to the present invention.

FIG. 2 is an enlarged view of a check valve of the oil filter.

FIG. 3 is an enlarged view of the outer periphery of the lid of the oil filter.

FIG. 4 is a partially cutaway view showing a conventional oil filter.

[Explanation of symbols]

 1 Lid 2 Housing 3 Filter Element 4 Oil Discharge Tube 5 Oil Inlet 6 Check Valve 6e Notch

Claims (1)

[Claims] 1. A cylindrical filter element is housed inside a housing, a bottom portion of the housing is closed by a lid, and an oil inlet communicating with an outer peripheral portion of the filter element is provided in the lid, In an oil filter provided with an oil discharge cylinder communicating with the inner peripheral portion of the element and having a check valve for covering the oil intake port from the inside of the housing, the upper end surface of the filter element is fixed to the upper surface portion of the housing. , The check valve is provided between the lower end surface of the filter element and the lid, and the check valve is provided with a notch so that the check valve is provided between the lower end surface and the lid. An oil filter which is adapted to expand and contract following the vertical movement of the filter element.