JPH0215245B2 - - Google Patents

Description

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

Generally, in automobile engines, an oil filter is installed in the lubrication system to remove impurities mixed in the lubricating oil. However, there is a limit to the overcapacity of the oil filter, and normal oil must be replaced every 2,500 to 3,000 km, and the filter element must be replaced every 5,000 to 6,000 km. In other words, the filter elements commonly used in the past employ a method in which oil passes through a sheet of paper in the thickness direction, so they are prone to clogging, and they also contain carbon, ash, and iron of 10 microns or less. This is because fine particles such as powder 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
The drawbacks are that there is a problem with overefficiency, and that the structure is complicated and manufacturing costs are high. In other words, the structure allows oil to pass only in the axial direction of the element, so there is a limit to the overflow rate, and the end face on the oil inlet side is narrow, so if trapped particles adhere there, the overflow rate will be extremely reduced. This is because, since the element is fitted and fixed within the casing, a highly precise and specially constructed valve must be used for the bypass.

The present invention has been developed in view of these circumstances, and has a very simple structure in which one end of a paper-wrapped filter element is covered with a cap that forms an oil passage communicating with an oil outlet, thereby alleviating the above-mentioned problems. The purpose of this invention is to provide an oil filter that solves these problems. 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 made using exactly the same method as so-called toilet paper. Therefore, the cylindrical core 1
b is made of cardboard, and this core body 1
b does not necessarily need to be made of cardboard for reasons described later, and may be a plastic pipe or a metal pipe. Reference numerals 2 to 4 are holding members for holding the filter element 1, and are 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 filter element 1 therebetween. There is. One of the perforated plates 3 has numerous holes 3a, the periphery of which has an annular protrusion 3b into which the end of the filter element 1 is fitted, and the central part a recessed portion that serves as a seat for a coil spring, which will be described later. 3c is integrally formed. The other perforated plate 4
has a diameter smaller than the diameter of the filter element 1, has numerous holes 4b like the perforated plate 3, and has an opening 4a in the center that communicates with the inside of the pipe 2.

Reference numeral 6 designates a cap that is placed over one end of the filter element 1 which is prevented from being deformed or deformed by the holding members 2 to 4, and this cap 6 is provided with a cap 6 for tightly binding the end of the element 1 when it is being placed. A tapered cylindrical portion 6a as shown in FIG. . Since this support portion 6c supports the perforated plate 4, it is desirable to form it into a mountain shape with as sharp a ridge line as possible so as not to block the hole 4b. 7
8 is a compression coil spring that elastically supports the filter element 1 held by the cap 6 and the holding members 2 to 4; 8 is a cylindrical casing with a bottom, the bottom 8a of which holds the spring 7; A protrusion 8b is provided to protrude inward, and the open end is sealed by the base 9 after the various members are loaded. The inner diameter of the casing 8 is such that the perforated plate 3 and the cap 6 can fit loosely therein 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.

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 O-ring interposed between the engine case and the engine case is fitted. A groove 92b is formed. The peripheral edge of this sealing member 92 is connected to the open end of the casing 8 through a bottom joint. Reference numeral 10 denotes a check valve made of an elastic material such as rubber and having a hem portion 10a having an outer diameter that covers the oil inlet 91c. It's being held in place. Therefore, this check valve 10 forms a one-way valve due to the elasticity of the skirt portion 10a, and the peripheral portion 10a forms a one-way valve.
It functions as a sealing material that prevents communication between the inlet 91c side and the outlet 91b side by the clamping pressure applied to c.

What is shown by a chain line in the lower center of FIG. 2 is a relief valve, which includes a valve body 11a and a valve spring 11b that selectively open and close an opening (not shown) formed in the perforated plate 3.
and a valve box 11c having a flange, and a deep groove 11d is bored in this box 11c. Note that this relief valve 11 is not necessary in a system in which a relief valve is provided on the pump side, a bypass type, or a shunt type.

Therefore, as shown in FIG. 2, in the oil filter of the present invention, a first oil passage A is formed at and around the lower end of the filter element 1, and the upper end surface of the element 1 and the bottom of the cap 6 are connected to each other. A second oil passage B is formed between them, and both oil passages A and B 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.
0, the hem part 10a is pushed open against the elastic force of the hem part 10a, and the first oil path A is opened from the oil inlet 91a.
That is, it is supplied into the space formed by the inside of the casing 8 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, and is passed from the lower end surface side of the element 1 to the second oil passage A.
The oil enters the oil passage B, and is sent to the oil port of the engine case through the oil outlet 91b. When the engine speed increases and the oil flow rate increases, or when the element becomes clogged and the excess 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, it goes without saying that the oil that does not flow through the relief valve to the cap 6 is 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. As described above, if the core body 1b of the element is made of a rigid and non-permeable material, the pipe 2 is not necessarily required. Also, element 1
In order to improve the flow rate of oil passing through the perforated plate 3 or 4 that holds the element, or to prevent paper dust from entering the element, a wire mesh may be used instead of the perforated plate, or a wire mesh may be used instead of the perforated plate 4. It is also possible to have a structure in which a wire mesh is attached to either the inside or the outside.

Furthermore, although the element 1 is supported by the protruding part 6c provided on the bottom of the cap 6, it is possible to lock the perforated plate 4 or the end of the element 1 by using the taper of the peripheral wall 6a of the cap 6. Alternatively, a structure may be adopted in which a protrusion is provided on the perforated plate 4 side to form the second oil passage B. 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. Further, in the embodiment described above, the base 9 is formed by joining the oil port member 91 and the seal member 92, but these may be formed from a single material.

FIG. 3 shows an embodiment in which the pipe 2 and the coil spring 7 are not used. That is, as mentioned above, the pipe 2 is essentially for preventing deformation of the filter element 1, so if the core body 1b is made of, for example, a plastic pipe, it becomes unnecessary, and the coil spring is Since numeral 7 is for holding the filter element 1 under clamping pressure, the elasticity of the check valve 10 can be used to similarly hold the clamping pressure, making it unnecessary. In the figure, 20 indicates an adhesive layer for sealing, and 21 indicates a radially protruding portion on the bottom 8a of the casing 8. In addition, in an embodiment in which a relief valve is not provided, there is no need to form an oil passage in the core body 1b, so the core body 1b does not need to be a hollow body, and a solid bar may be used. .

As explained above, according to the present invention, since the first oil passage communicating with the oil inlet side is in contact with one end surface and the circumferential surface of the element, the area where oil collides, which is most likely to cause clogging, is large. Take it,
Therefore, high overefficiency can be maintained for a long period of time. In addition, by simply covering the other end of the element with a cap, the second oil passage isolated from the first oil passage can be opened.
Since the oil passage can be formed, it is possible to obtain an oil filter using a wrapping paper type element with an extremely large overcapacity with a simple structure without requiring any special members. Furthermore, since the oil passage communicating with the oil inlet side and through which oil flows is formed in contact with the entire inner wall surface of the casing, an oil cooling effect can be expected. Furthermore, if a structure like the embodiment shown in the figure is adopted, a considerable number of the components of oil filters that are currently widely used can be reused, and an excellent filter can be obtained in all respects without increasing the number of parts. It is also advantageous to be able to provide an oil filter with a capable paper wrapper element.

[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 sectional view of a main part of another embodiment. 1...Filter element, 6...Cap,
8...Casing, 9...Base, 91c...Oil inlet, 91b...Oil outlet, B...Oil path.

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 the filter element, and a base that has an oil inlet and outlet and closes the open end of the casing. A cap interposed between the base and the filter element is provided, and by capping one end of the filter element with the cap, first and second oil passages partitioned by the capping portion are formed. The first oil passage faces one end surface and the circumferential surface of the filter element and communicates with the oil inlet, and the second oil passage faces the other end surface of the filter element and communicates with the oil inlet. An oil filter characterized by communicating with an outlet.