JP2018003613A - Oil filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil filter that can prevent sludge from entering an engine even when lubricant flows while detouring an element.SOLUTION: An oil filter 11 filters sludge 8 by causing lubricant 7 to pass through an element 2 and, when passage resistance of an element 2 excessively increases, opens a bypass valve 10 with an increase in entrance-side hydraulic pressure of the element 2 so as to open a bypass passage 5 that detours the element 2. A gause filter 12 having relatively low passage resistance to the element 2 is interposed in the middle of a bypass passage 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil filter.

  Generally, lubricating oil used in engines such as automobiles is repeatedly used by circulating in the engine. However, when the oil passes through the engine, it is generated at a sliding portion between metals. Since metal powder and sludge such as soot generated by combustion in the cylinder are mixed, it is necessary to capture such sludge through an oil filter and remove it from the lubrication system.

  FIG. 4 shows an example of a conventional oil filter. The oil filter 1 shown here includes a filter cartridge 3 containing a cylindrically shaped element 2 formed by folding a filter paper, and the filter cartridge 3 is attached and detached. Lubricant that is freely installed and is configured by a filter body 6 having a normal path 4 for supplying and discharging lubricating oil to and from the element 2 and a bypass path 5 for bypassing, and is introduced from an inlet 4a of the normal path 4 The oil 7 wraps around the outer periphery of the element 2 and passes through the axial center, and after the sludge 8 is filtered off, the oil 7 is sent from the axial center of the element 2 to the outlet 4 b of the normal path 4. ing.

  On the other hand, the bypass path 5 provided in parallel with the normal path 4 inside the filter body 6 is equipped with a bypass valve 10 that is normally closed by the elastic force of the spring 9, as shown in FIG. Only when the passage resistance of the element 2 is excessively increased, the bypass valve 10 is pushed up against the elastic force of the spring 9 due to the increase of the entry side hydraulic pressure of the element 2, whereby the bypass valve 10 is opened and bypassed. The path 5 is opened.

  For example, at the time of cold start when the engine is cold, the viscosity of the lubricating oil 7 is very high, so that it is difficult for the element 2 to pass through. In such a case, the bypass path 5 is opened and the lubricating oil 7 is bypassed because there is a concern that the lubricating oil 7 may be crushed and damaged, or the supply of the lubricating oil 7 to the engine may be insufficient. Element 2 is protected.

  As prior art document information relating to this type of oil filter, there is the following Patent Document 1 and the like.

JP 2013-87670 A

  However, in such a conventional oil filter 1, since the lubricating oil 7 bypasses the element 2 and is sent out to the engine without being filtered at the time of cold start or the like, the sludge 8 is placed on the sliding portion of the engine. As a result, there is a risk of damage being caused, and there is a need for a reliable measure that can protect the engine.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an oil filter that can prevent sludge from entering the engine even if the lubricating oil flows while bypassing the element.

  The present invention opens the bypass path that bypasses the element by opening the bypass valve by increasing the entry side hydraulic pressure of the element when the lubricating oil is passed through the element and sludge is filtered and the passage resistance of the element is excessively increased. The oil filter is configured to include a goose filter having a relatively lower passage resistance than the element in the middle of the bypass path.

  Thus, at the time of cold start or the like, when the passage resistance of the element is excessively increased and the entry hydraulic pressure of the element is increased, the bypass valve is pushed up against the spring force of the spring. When the valve is opened and the bypass path is opened, the lubricating oil flows around the element, but the sludge in the lubricating oil is filtered out by the goose filter installed in the middle of the bypass path. Intrusion of sludge into the water will be prevented.

  At this time, since the passage resistance of the goose filter is relatively lower than that of the element, the supply amount of the lubricating oil is increased as compared with the case where the element is passed, and the shortage of supply of the lubricating oil to the engine side is obviated. It can be avoided. It should be noted that the degree to which the passage resistance of the goose filter is lowered may be set as low as possible within a range in which a sludge capture rate necessary for protecting the engine side can be secured.

  Further, in the present invention, a filter cartridge containing the element, and a filter body in which the filter cartridge is detachably mounted and a lubricating oil supply / discharge normal path and a bypass bypass path are provided inside the element. It is preferable that the goose filter is detachably mounted on the filter body.

  In this way, it is possible to easily replace the filter cartridge by attaching / detaching only the goose filter from the filter body while the filter cartridge is attached to the filter body, without attaching / detaching the filter cartridge. .

  Furthermore, in the present invention, it is preferable that the goose filter is constituted by a wire mesh having coarser mesh than the element, and in this way, the goose filter having a relatively low passage resistance than the element is easily and high. It will be realized with strength.

  According to the oil filter of the present invention described above, various excellent effects as described below can be obtained.

  (I) According to the invention described in claim 1 of the present invention, sludge can be filtered out by a goose filter in the middle of the bypass path even if the element is bypassed and lubricating oil is allowed to flow. Invasion of the engine can be prevented, and the possibility that the sludge gets caught in the sliding portion of the engine and causes damage can be avoided and the engine can be reliably protected.

  (II) According to the invention described in claim 2 of the present invention, only the goose filter is detached from the filter body while the filter cartridge is attached to the filter body, without the work of removing or disassembling the filter cartridge. Exchange work can be performed easily.

  (III) According to the invention described in claim 3 of the present invention, a goose filter having a relatively lower passage resistance than the element can be realized easily and with high strength, and its implementation cost is reduced and durability is increased. Can be improved.

It is the schematic which shows an example of the form which implements this invention. It is a front view which shows the detail of the goose filter of FIG. It is the schematic which shows the state which opened the bypass path | route of FIG. It is the schematic which shows an example of the conventional oil filter. It is the schematic which shows the state which opened the bypass path | route of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIGS. 4 and 5 represent the same items.

  As shown in FIGS. 1 to 3, in this embodiment, the lubricating oil 7 is passed through the element 2 to filter out the sludge 8 and pass through the element 2 in substantially the same manner as described above with reference to FIGS. 4 and 5. The oil filter 11 that opens the bypass valve 10 and bypasses the element 2 by opening the entry side hydraulic pressure of the element 2 when the resistance is excessively increased is provided in the middle of the bypass path 5. Further, a goose filter 12 having a lower passage resistance than the element 2 is interposed.

  In the example shown here, a filter cartridge 3 containing a cylindrically shaped element 2 formed by folding a filter paper, and a normal path for detachably mounting the filter cartridge 3 and supplying and discharging lubricating oil to and from the element 2 4 and a filter body 6 provided with a bypass path 5 inside for bypassing, an oil filter 11 is configured. In the middle of the bypass path 5 on the filter body 6 side, A goose filter 12 (see FIG. 2) constituted by a coarse wire mesh is mounted in a detachable slide cassette system.

  That is, the goose filter 12 has a sheet shape with one side attached to the bracket 13 and is inserted so as to dam the bypass path 5 from the slit 14 on the filter body 6 side. And is fixed by fastening to the filter body 6 side, and is fixed by gaskets 16 and 17 respectively provided at a base end portion with respect to the bracket 13 and a peripheral portion from the base end side to the front end side. The liquid tightness is maintained.

  Thus, when the passage resistance of the element 2 is excessively increased at the time of cold start or the like and the entry side hydraulic pressure of the element 2 is increased, the bypass valve 10 is pushed up against the elastic force of the spring 9. As a result, the bypass valve 10 is opened and the bypass path 5 is opened, and the lubricating oil 7 flows around the element 2, but the lubricating oil is fed by the goose filter 12 interposed in the middle of the bypass path 5. The sludge 8 in the filter 7 is filtered and the sludge 8 is prevented from entering the engine.

  At this time, since the passage resistance of the goose filter 12 is relatively lower than that of the element 2, the supply amount of the lubricating oil 7 is increased as compared with the case where the element 2 is passed, and the lubricating oil 7 to the engine side is increased. It becomes possible to avoid supply shortage. It should be noted that the degree to which the passage resistance of the goose filter 12 is lowered may be set as low as possible within a range in which the capture rate of the sludge 8 necessary for protecting the engine side can be secured.

  In the description of the present embodiment, the case where the viscosity of the lubricating oil 7 is increased during cold start and the passage resistance of the element 2 is excessively increased is described. However, the passage resistance of the element 2 due to clogging by the sludge 8 is reduced. Since the bypass path 5 is similarly opened even when it is excessively high, it is a matter of course that the same effect as described above can be obtained even in such a case.

  Therefore, according to the above embodiment, the sludge 8 can be filtered out by the goose filter 12 in the middle of the bypass path 5 even if the lubricating oil 7 is caused to flow around the element 2, so that the sludge 8 enters the engine. Therefore, it is possible to prevent the possibility that the sludge 8 may be caught in the sliding portion of the engine and cause damage, thereby ensuring reliable protection of the engine.

  Further, in this embodiment, the filter cartridge 3 containing the element 2, the filter cartridge 3 is detachably mounted, and the normal path 4 for supplying and discharging the lubricating oil to the element 2 and the bypass path 5 for bypassing are provided inside. Since the oil filter 11 is constituted by the filter body 6 provided in the filter body and the goose filter 12 is detachably mounted on the filter body 6, the filter cartridge 3 is not attached / detached or disassembled. While the filter cartridge 3 is mounted on the filter body 6, only the goose filter 12 can be detached from the filter body 6 and the replacement work can be easily performed.

  Furthermore, since the goose filter 12 is made of a wire mesh that is coarser than the element 2, the goose filter 12 having a relatively low passage resistance than the element 2 can be easily realized with high strength. Implementation costs can be reduced and durability can be improved.

  The oil filter of the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention.

2 Element 3 Filter cartridge 4 Normal path 5 Bypass path 6 Filter body 7 Lubricating oil 8 Sludge 10 Bypass valve 11 Oil filter 12 Goes filter

Claims (3)

  When lubricating oil is passed through the element and sludge is filtered and the passage resistance of the element is excessively increased, the bypass valve can be opened by bypassing the element by opening the inlet side hydraulic pressure of the element so that the bypass path can be opened. An oil filter comprising a goose filter having a lower passage resistance than that of the element in the middle of the bypass path.   A filter cartridge containing the element, and a filter body in which the filter cartridge is detachably mounted and includes a normal path for supplying and discharging lubricating oil to the element and a bypass path for bypassing the element. The oil filter according to claim 1, wherein a goose filter is detachably mounted.   The oil filter according to claim 1 or 2, wherein the goose filter is formed of a wire mesh having coarser mesh than the element.

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