JPH0643204U - Oil filter - Google Patents

Abstract

(57) [Summary] [Object] To provide an oil filter which prevents foreign matters from being deposited on the filtration surface and has a long filter life. An oil filter has primary passages 48, 5 having primary inlet 40 and primary outlet 42 of unpurified oil.
2 and the filter body 1 in which the filtering surfaces 16a and 18a are arranged along the flow direction of the unpurified oil passing through the primary passage.
6, 18 and a secondary passage 56 through which the purified oil that has passed through the filter bodies 16, 18 flows, and forms a circulation circuit between the primary outlet 42 and the primary inlet 40. . The filtering medium 33 of the filtering bodies 16 and 18 has a small filtering diameter on the inflow side and a large filtering diameter on the outflow side.
The filter medium 33 is arranged so that an axial flow is formed in the passage of the primary side passages 48, 52 on the surface of 18 and the secondary side passage 56 is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil filter mounted on an automobile, for example.

[0002]

[Prior art]

 Lubricating oil for engines installed in automobiles is constantly filtered through an oil filter when the engine is operating to remove foreign matters contained in the oil. Most of this foreign material is "soot" generated during combustion, and this "soot" is mixed and dispersed in the oil in submicron units, which promotes wear of the sliding parts and oil The viscosity rises and the discharge rate of the oil pump decreases, resulting in insufficient lubrication and running out of oil in the sliding parts.

By the way, a conventional oil filter generally employs a so-called dead end filtering method. That is, as shown in FIG. 3, the oil filter based on the dead end filtration system uses the oil containing the foreign matter X, that is, the non-purified oil, in a direction substantially perpendicular to the filtering surface b of the filter body a, so that the oil is removed. Is being filtered.

However, in such a conventional oil filter, the foreign matter X captured when being filtered by the filter body a is sequentially deposited on the filtering surface to cause clogging, and the filtering performance deteriorates over time. . In a filter in which such clogging occurs, when the filtration accuracy is improved and the filter hole diameter of the filter body a is reduced, the filter is clogged early and the filter life is significantly shortened. On the other hand, in order to prolong the filter life, it is necessary to increase the filter pore size, which inevitably reduces the filtration accuracy.

That is, in the conventional oil filter, the filtration accuracy and the filter life are in a mutually contradictory relationship, and there has been a strong demand for the development of an oil filter that satisfies both of them. Therefore, for example, in Japanese Patent Application No. 2-90296, when the unpurified oil in the primary passage passes through the filter body, the filtering surface is arranged along the flow direction of the primary passage, The foreign matter trapped on the filter is always subjected to a force in the direction of peeling it off by the oil flowing through the primary passage to prevent the foreign matter from being deposited on the filtration surface. The foreign matter separated from the filtration surface holds the foreign matter in the entire circulation circuit formed between the primary outlet, the oil pan, and the primary inlet.

At this time, a portion corresponding to the oil filtered through the filtration surface is sequentially replenished to the primary side passage. Therefore, unlike the case where the foreign matter is trapped only on the filtration surface of the filter body, it is carried out in the entire circulation circuit, so that the trapped amount becomes very large and the filter hole diameter of the filter body is reduced. Even in such a case, the structure is such that clogging can be eliminated and the filter life can be significantly improved. However, the oil filter having such a structure has the technical problems described below.

[0007]

[Problems to be solved by the device]

 In the conventional oil filter described above, the filter member layer has a uniform filter hole diameter in the oil passage direction, and a filter member having a small filter hole diameter may be used. Therefore, the filter member is suitable for filtration. It couldn't be said to hold the state.

The present invention has been made in view of such conventional problems, and an object thereof is to keep a filter member in a state suitable for filtration to a longer practical filter life. To provide a simple oil filter.

[0009]

[Means for Solving the Problems]

 To achieve the above object, an oil filter according to the present invention comprises a primary passage having a primary inlet and a primary outlet for non-purified oil, and a flow direction of the non-purified oil passing through the primary passage. A filter having a filter surface disposed along the filter, and a secondary passage through which purified oil that has passed through the filter flows, and a circulation circuit is provided between the primary outlet and the primary inlet. And the filtering member of the filter body has a small filtration diameter on the inflow side and a large diameter on the outflow side.

[0010]

[Action]

 According to the oil filter of the present invention having the above-described configuration, when the unpurified oil in the primary side passage passes through the filter body, the filtering surface is arranged along the flow direction of the primary side passage. Since the filtration member has a small filtration diameter on the inflow side and a large diameter on the outflow side, the foreign matter captured on the filtration surface is constantly subjected to a force in the direction of separating it by the oil passing through the primary side passage, It is possible to prevent foreign matter from being deposited on the filtration surface, and at the same time to prevent foreign matter from being deposited inside the filter member, thereby extending the filter life.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. That is, FIG. 1 is an oil filter 10 showing an embodiment of the present invention, and FIG. 1 is a sectional view of the oil filter 10 including a system circuit.

The oil filter 10 shown in FIG. 1 has a cylindrical filter body 16 as a first-layer filter body, and a first cylindrical filter body 16 in a bottomed cylindrical container 14 whose upper end opening is closed by a lid 12. The second filter body 18 and the cylindrical filter body 18 are housed concentrically to form a schematic structure.

A tubular mounting portion 20 is arranged in the center of the lid body 12, and the tubular mounting portion 20 is screwed and supported by a mounting barrel 22 a of a head 22. End plates 24 and 26 are provided on the upper and lower ends of the cylindrical filter body 16, respectively. The opening 24a of the upper end plate 24 is mounted on the outer periphery of the tubular mounting portion 20 with a gasket 28 interposed so that an appropriate gap is provided between the opening 24a and the outer periphery of the tubular mounting portion 20. . At the upper end of the cylindrical filter body 18, an end plate 25 having an open center is provided, and the opening 25a is liquid-tightly fitted to the discharge pipe 22b through an O-ring 38, so that the filter body 18 The lower end is supported by an end plate 26 that is common to the filter body 16.

A compression spring 30 is contracted between the lower end plate 26 and the bottom surface of the container 14, and the spring 30 urges the upper end of the opening 24 a to press the gasket 28. is doing. The filter body 18 is disposed inside the filter body 16 with an appropriate interval, and the filter bodies 16 and 18 have a filtering member 33. The filtering member 33 has a small filtration diameter on the inflow side and a large diameter on the outflow side.

On the other hand, the head 22 is formed with a primary side inlet 40, a primary side outlet 42 and a secondary side outlet 44. The primary inlet 40 communicates between the container 14 and the filter body 16 through the opening 12a formed in the lid 12, passes through the inner side of the filter body 18, and reaches the primary outlet 42. It is in communication.

The primary-side inlet 40 and the primary-side outlet 42 are the primary-side outer passage 48 between the container 14 and the filter body 16 and the opening 26 of the lower end plate 26 of the filter body 16. The primary side passage 52 of the cylindrical filter body 18 is communicated via the a.

A secondary side passage 56 is formed by a flow path from the space between the filter body 16 and the filter body 18 to the secondary side outlet 44 through the outside of the discharge cylinder 22b and the inside of the mounting cylinder 22a. It

Next, an oil system circuit connected to the oil filter 10 having the above-described configuration will be described.

Reference numeral 100 denotes a main oil pan, and the oil in the main oil pan 100 is sucked by the first oil pump 102 and supplied to the engine sliding portion 106 via the full flow filter 104, and a lubricating path 108, It is branched to the filtration path 112 supplied to the oil filter 10 via the introduction circuit 110.

A check valve 114, a second oil pump 118 for introducing oil from a bypass oil pan 130, a relief valve 116, and a heat exchanger 120 are sequentially installed in the introduction circuit 110 in the downstream direction. They are arranged, and the final end thereof is connected to the primary side inlet 40 of the oil filter 10. On the other hand, a circuit 122 is connected to the primary side outlet 42 of the oil filter 10. The circuit 122 flows out to the bypass oil pan 130, and a circulation circuit from the primary side outlet 42 to the primary side inlet 40. Is configured.

A discharge circuit 124 is connected to the secondary outlet 44 and communicates with the main oil pan 100 via the discharge circuit 124.

Next, the operation of the oil filter 10 of the present embodiment having the above configuration will be described. The oil in the main oil pan 100 sucked by the first oil pump 102 is unpurified oil mixed with foreign matter, and when this unpurified oil is branched into the filtration path 112 and introduced into the introduction passage 110. After being made to have a constant pressure by the relief valve 116 of the second oil pump 118, what is heated by the heat exchanger 120 which is appropriately operated is supplied to the oil filter 10.

The heat exchanger 120 is intended to keep oil temperature and reduce viscosity by using engine cooling water as a heat source. The non-purified oil supplied to the primary side inlet 40 of the oil filter 10 uses the outer peripheral portion of the filter body 16 as the primary outer passage 48 and the inner peripheral portion of the filter body 18 as the primary inner passage 52. The non-purification oil circulates in this direction in the axial direction, passes through the filter medium 33 of the filter body 16 and the filter body 18, and enters the secondary side passage to form the secondary side passage 56. At this time, the foreign matter X is captured by the filter medium 33 and becomes purified oil. Other oil passes through the primary side passage of the filter 10 and is discharged to the bypass oil pan 130 from the circuit 122 connected to the primary side outlet 42.

The oil purified by passing through the filter body 16 and the filter body 18 passes through the secondary passage 56 and the secondary outlet 44 and is returned from the discharge circuit 124 into the main oil pan 100. In this case, when the oil flows out to the secondary passage 56 side, the check valve 114 opens and the primary passage 48 is automatically replenished with the oil.

On the other hand, the remaining unpurified oil that has not passed through the filter body 16 and the filter body 18 passes from the primary side inner passage 52 through the primary side outlet 42 and the circuit 122 to the bypass oil pan 130. Discharge. Then, the non-purified oil returned to the introduction circuit 110 is again supplied from the primary inlet 40 to the primary passage 48. By repeating this process, the concentration of the foreign matter X in the oil in the bypass oil pan 130 increases.

By the way, in the present embodiment, the outer peripheral portion of the filter body 16 is the primary outer passage 48, and the outer peripheral portion of the filter body 16 and the inner peripheral portion of the filter body 18 are the primary inner passage 52. As a result, unpurified oil flows in the axial direction, so that the filtering surface 16 a of the filter body 16 and the filtering surface 18 a of the filter body 18 are parallel to each other as shown in FIG. Will be placed in.

As a result, the foreign matter X captured on the filtration surface 16a and the filtration surface 18a is subjected to the peeling force due to the flow of the non-purified oil, and the foreign matter X that has received this peeling force acts on the filtration surface 16a and the filtration surface. It is mixed in the non-purified oil without being deposited on the surface and inside of 18a. On the other hand, the primary side circuit 54 is a circulation circuit through the circuit 122, the bypass oil pan 130, and the introduction circuit 110 and circulates in the circulation circuit. The foreign matter X mixed in is retained in a large space in the entire circulation path.

Therefore, the amount of trapped foreign matter X is significantly increased as compared with the conventional dead end filtration type oil filter, and the filtering member 33 of the filter bodies 16 and 18 has a filtering diameter on the inflow side. Has a small diameter and the outflow side has a large diameter, and foreign matter X is not deposited on the inside of the filtration surface 16a and the filtration surface 18a. Therefore, the purifying ability of the filter body 16 and the filter body 18 is always maintained at a substantially optimum state. Therefore, the filter life can be significantly improved. Further, even when the filter medium 33 has a small pore size, the reduction of the purification capacity is suppressed from being accelerated, so that the purification accuracy can be remarkably improved.

In the oil filter 10 of this embodiment, the concentration of the foreign matter X in the primary passage 52, which is a circulation circuit, gradually increases due to the foreign matter X that is sequentially mixed in the unpurified oil. However, the non-purified oil having a high concentration is prevented from flowing back into the main oil pan 100 by the check valve 114 even when the second oil pump 118 is stopped due to the engine stop.

By the way, in the oil filter 10, when the foreign matter X concentration of the bypass oil pan 130, which is a circulation circuit, reaches the limit value (about 30 wt%), the oil of the oil filter 10 is exchanged. When the filter 10 is replaced, the contaminant oil in the introduction circuit 110, the bypass oil pan 130 and the circuit 122 may be removed.

[0031]

[Effect of device]

 As described above, in the oil filter of the present invention, when the unpurified oil in the primary side passage passes through the filter body, the filtering surface is arranged along the flow direction of the primary side passage. Therefore, it is possible to prevent the foreign matter captured on the filtration surface from being peeled off by the circulation of the oil at this time and to be deposited on the filtration surface.

Further, the foreign matter separated from the filtration surface flows from the primary outlet to the introduction passage connected to the primary inlet, and is formed between the primary outlet and the primary inlet. Hold foreign matter in the entire circulation circuit. Furthermore, since the filtration member has a smaller filtration diameter on the inflow side and a larger filtration diameter on the outflow side, it is possible to keep the entire filtration member in a state suitable for filtration sufficiently without depositing foreign matters inside thereof. Therefore, there is an excellent effect that the purification accuracy can be remarkably improved and the filter life can be remarkably improved.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a filtration state of the oil filter.

FIG. 3 is an explanatory diagram of a filtration state of a conventional oil filter.

[Explanation of symbols]

 10 Oil Filters 16 and 18 Filter Body (Filtration Body) 16a and 18a Filtration Surface 40 Primary Side Inlet 42 Primary Side Outlet 44 Secondary Side Outlet 48 Primary Side Outer Passage 52 Primary Side Inside Passage 56 Secondary Side Passage 100 Main oil pan 102 First oil pump 118 Second oil pump 110 Introduction passage 130 Bypass oil pan

Claims (1)

[Scope of utility model registration request] 1. A filtration having a primary side passage having a primary side inlet and a primary side outlet of unpurified oil, and a filtering surface arranged along a flow direction of the unpurified oil passing through the primary side passage. The body and the purified oil that has passed through this filter flow 2
A secondary passage is provided, and a circulation circuit is configured between the primary outlet and the primary inlet, and the filtering member of the filter body has a small filtering diameter on the inflow side and a large diameter on the outflow side. An oil filter characterized by that.