JPH0215244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil filter including a filter element formed by winding thin paper around a cylindrical core in large numbers.

Generally, in automobile engines, an oil filter is installed in the lubrication system to remove impurities such as metal wear particles and carbon mixed into the lubricating oil. However, there is a limit to the overcapacity of the oil filter, and for normal oil, it is required every 2500 to 3000 km, and for filter elements, it is
I had to replace it every 6000km. In other words, the filter elements commonly used in the past employ a method that essentially allows oil to pass through a sheet of paper in the thickness direction.
This is because clogging occurs easily, and fine particles such as carbon, ash, and metal abrasion powder of 10 microns or less cannot be captured at all.

In this way, disposing of lubricating oil that is still usable simply due to the overcapacity of the oil filter is not only contrary to resource conservation, but also poses the risk of causing so-called secondary pollution when disposing of waste oil. , this solution has been requested. Naturally, it is conceivable to use a filter element with a high overcapacity, but the use of such an element generally has the disadvantages of being expensive and increasing the size of the oil filter itself.

Therefore, in recent years, an oil filter has been proposed which uses a filter element called a tissue element, which is made by winding a large number of thin paper around a core. According to this oil filter, the ability to pass through the fine particles mixed in the oil can be expected to be sufficient, but
There are disadvantages of over-efficiency and a complicated structure that increases manufacturing costs. In other words, because the structure allows oil to pass only in the axial direction of the element, there are restrictions on the overflow rate, and because the end face on the oil inlet side is narrow, if trapped particles adhere there, the overflow rate will be extremely reduced. In addition, since the element is fitted and fixed within the casing, a valve with high precision and a special structure must be used for bypass.

The present invention has been made in view of the above circumstances, and by forming a press-fit portion around the bottom end of the casing of a paper-wrapped filter element, a first oil passage and a second oil passage are separated. The object of the present invention is to provide an oil filter that solves the above-mentioned problems at once with an extremely simple configuration. Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

The drawings show an example in which the present invention is applied to an oil filter for an automobile engine. FIG. 1 is an exploded perspective view of the oil filter, and FIG. 2 is a longitudinal sectional view. In these figures, the reference numeral 1 indicates a filter element, and this element 1 is formed into a thick cylindrical shape by winding a long, water-insoluble thin paper 1a around a cylindrical core 1b many times. It is formed using exactly the same method as that of so-called toilet paper. Therefore, the cylindrical core 1b
is made of cardboard, and this core 1b
For reasons described later, the pipe need not necessarily be made of cardboard, but may be a plastic pipe or a metal pipe. 2 to 4 are the filter elements 1
It is a holding member for holding the element 1, and is composed of a pipe 2 inserted into the element 1, and perforated plates 3 and 4 located at both ends of the pipe 2 and holding the element 1 therebetween. One of the perforated plates 3 has countless holes 3a, its periphery has an annular protruding edge 3b into which the end of the filter element 1 is fitted, and the central portion has a cylindrical portion 3d having a folded portion 3c at its tip. are integrally formed. The other perforated plate 4 has a diameter smaller than the diameter of the filter element 1, and is provided with countless holes 4b like the perforated plate 3, and has an opening 4a communicating with the inside of the pipe 2 in the center. It is provided.

Reference numeral 6 denotes a casing that covers the entire filter element 1 held by the holding members 2 to 4, and the casing 6 includes the element 1 when fitted.
a tapered cylindrical portion 6a that tightly binds around the end of the cylindrical portion 6a;
A support portion 6c is integrally formed by stamping out radially inside the casing bottom 6b so as to support the element 1 through the perforated plate 4. The inner diameter of the tapered cylindrical portion 6a is formed to be slightly smaller than the outer diameter of the filter element 1, so that when the element 1 is fitted, the end portion thereof is compressed and deformed in the radial direction to form a press-fit portion 7. The inner diameter of the portion of the casing 6 excluding the tapered cylindrical portion 6a is such that the perforated plate 3 can be fitted loosely so that an oil passage is formed between the outer circumferential surface of the filter element 1 and the inner circumferential surface of the casing. Dimensions.

The base 9 includes an oil port member 91 and an oil port member 91.
A sealing member 92 is spot-welded to the holder. At the center of the oil port member 91 is a threaded portion 91a that is screwed into an oil port of an engine case (not shown).
An oil outlet 91b having an oil outlet 91b and an oil inlet 91c bored around the outlet 91b are provided. On the other hand, the seal member 92 is provided with an opening 92a through which the oil inlet 91c is opened, and the peripheral edge of the opening 92a has a recess into which an annular sealing material interposed between the engine case and the engine case is fitted. A groove 92b is formed. The peripheral edge of the seal member 92 is connected to the open end of the casing 6 through a bottom joint. Reference numeral 10 denotes a check valve formed of an elastic piece such as rubber having a hem portion 10a having an outer diameter that covers the oil inlet 91c. It is being held sideways. Therefore, this check valve 10 has a bottom portion 10a.
A one-way valve is formed by the elasticity of the peripheral part 1.
Due to the clamping pressure to 0c, the inlet 91c side and the outlet 91b
It functions as a sealing material that prevents communication with the other side.

Therefore, as shown in FIG. 2, in the oil filter of the present invention, the first oil passage A is formed on the upper end side and around the filter element 1, and the first oil passage A is formed between the lower end surface of the element 1 and the bottom 6b of the casing 6. A second oil passage B communicating with the inside of the pipe 2 is formed between the
Both oil passages A and B are partitioned by a press-fit portion 7 formed around the bottom end of the casing of the element 1, and communicate with an oil inlet 91c and an oil outlet 91b, respectively.

Next, the operation of this oil filter will be explained. First, the oil pumped from the direction of the arrow by the oil pump on the engine side passes through check valve 1.
The hem 10a is pushed open against the elastic force of the hem 10a of 0, and the first oil path A is opened from the oil inlet 91c.
That is, it is supplied into the space formed by the inside of the casing 6 and the base 9, and the upper end and peripheral surface of the element 1. The oil supplied to the first oil passage A passes through the element 1 from the lower end and outer periphery of the element 1, enters the second oil passage B from the lower end side of the element 1, and passes through the pipe 2. The oil is then sent to the oil port in the engine case. When the engine speed increases and the oil flow rate increases, or when the element becomes clogged and the excessive flow rate decreases, the relief valve on the engine side opens and oil is bypassed from the high pressure side to the low pressure side. Note that the mechanism in this respect is not particularly different from that of commonly used engine oil filters. Of course, as in the embodiment shown in FIG.
It goes without saying that if a relief valve is provided in between, the oil that does not pass through the relief valve will be bypassed.

As is clear from the above description, the main feature of the present invention is that oil entering from one end surface and the circumferential surface of the filter element 1 is discharged from the other end surface of the element 1. If the core body 1b of the element is made of a non-permeable material as described above, the pipe 2 is not necessarily required. Further, in order to improve the flow rate of oil passing through the perforated plate 3 or 4 that holds the element 1, or to prevent paper powder from getting into the element, a wire mesh may be used instead of the perforated plate, or A structure may also be adopted in which a wire mesh is attached to either the inside or outside of the perforated plate 4.

Furthermore, the element 1 is attached to the bottom 6b of the casing 6.
Although the structure is supported by a protrusion 6c protruding from the
This protrusion 6c may be provided on the perforated plate 4 side, or
Alternatively, the second oil passage B may be formed by locking the end of the perforated plate 4 or the element 1 using the taper of the tapered cylindrical portion 6a of the casing 6. Further, the check valve 10 is not necessarily necessary since it is simply for preventing the built-in oil from flowing out when the oil filter is removed. Furthermore, in the embodiment, the cover 9 is connected to the substrate 91 and the seal member 92.
Although an example has been shown in which they are formed by joining them together, they may also be formed from a single material.

FIG. 3 shows another embodiment of the invention. In this embodiment, the oil port member 91 of the base 9 and the pipe 2 that holds the element 1 are integrally formed, and the pipe 2
An example is shown in which the core material 1b of the element 1 is bonded.
The reference numeral 12 indicates this adhesive layer, and the reference numeral 13 indicates a relief valve interposed between the oil passages A and B.
a, a bypass passage 1 made up of a valve spring 13b and a valve box 13c, and bored in a pipe 2;
4 is provided.

FIG. 4 shows another embodiment of the press-fit part 7, and in this embodiment, the press-fit part 7 that partitions the oil passages A and B is formed by an annular seal member 15 fitted into the bottom side of the casing 6. . That is, this annular sealing member 15 is provided with a tapered hole 16 that tightens around the end of the filter element 1 and a stepped portion 17 that locks the perforated plate 4, and is made of an elastic material such as rubber. , performs a seal between the oil passages A and B, and functions as a member that elastically supports the element 1. Note that, according to this embodiment, there is no need to provide the protruding portion 6c or the tapered cylindrical portion 6a on the casing 6 as shown in the previous embodiment, and the filter can be applied to either of the filters shown in FIGS. 2 and 3.

As explained above, according to the present invention, since the first oil passage communicating with the oil inlet side is in contact with the end surface and the circumferential surface of the element, the area where oil collides, which is most likely to cause clogging, can be increased. Therefore, high overefficiency can be maintained for a long period of time.
In addition, the second oil passage isolated from the first oil passage can be formed simply by press-fitting the end of the element into the casing directly or through an annular seal member, so no special member is required. With this configuration, it is possible to obtain an oil filter using a wrapping paper type element with extremely large overcapacity. Furthermore, since the first oil passage is formed in contact with the peripheral wall surface of the casing, an oil cooling effect can be expected.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an oil filter according to the present invention, FIG. 2 is a vertical cross-sectional view,
FIG. 3 is a longitudinal cross-sectional view showing another embodiment, and FIG. 4 is a longitudinal cross-sectional view of a main part similarly showing another embodiment. 1... Filter element, 1b... Cylinder core body,
6... Casing, 7... Press-fitting part, 9... Base, 91c... Oil inlet, 91b... Oil outlet, A... First oil passage, B... Second oil passage.

Claims (1)

[Claims] 1. A filter element formed by winding a large number of thin paper into a thick cylindrical shape, a bottomed cylindrical casing that covers this filter element, and a base that has an oil inlet and outlet and closes the open end of the casing. In the oil filter equipped with the above-mentioned oil filter, a press-fitting part into which an end of the filter element is press-fitted is provided at the bottom end of the casing, thereby forming a first and second oil passage partitioned by the press-fitting part. , these first and second oil passages are communicated with an oil inlet and an oil outlet, the first oil passage facing one end surface and a peripheral surface of the filter element,
An oil filter characterized in that the second oil passage faces the other end surface of the filter element.