JP2004293490A - Oil strainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the function as an oil strainer even when an oil pan is largely indented. <P>SOLUTION: This oil strainer 18 is constituted so as to contain a suction pipe 20 having at least a tip part extending in the substantially vertical direction, a mesh member 22 fixed to the suction pipe 20 while covering the tip part periphery of the suction pipe 20, and filtering foreign matter mixed in oil stored in the oil pan 12, and a movable pipe 24 slidably fitted to the tip part of the suction pipe 20, and always joined in a lower side position having the small fitting length. On the tip part peripheral wall of the suction pipe 20, a first opening 20A blocked up by the peripheral wall when the movable pipe 24 exists in the lower side position is formed, and on the peripheral wall of the movable pipe 24, a second opening part 20B blocked up by the peripheral wall of the suction pipe 20 when the movable pipe 24 exists in the lower side position, and opening by communicating with the first opening part 20A when the movable pipe 23 slides up to an upper side position by releasing joining, is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil strainer mounted on an oil pan of an internal combustion engine, and more particularly, to a technique for securing the function of the oil pan even when the oil pan is greatly recessed.
[0002]
[Prior art]
As disclosed in Non-patent Document 1, an oil pan of an internal combustion engine is provided with an oil strainer that guides oil stored therein to an oil pump and filters foreign substances such as sludge mixed in the oil. . The oil strainer is mounted so that its oil suction port is located as low as possible in the oil pan so that oil can be reliably guided to the oil pump even when the vehicle is tilted.
[0003]
[Non-patent document 1]
"New Car Manual (Supplement Edition III) Introduction of Changes in NISSAN Safari Y60 Type Car", Nissan Motor Co., Ltd., October 1991, p. B19-20
[0004]
[Problems to be solved by the invention]
However, when the vehicle comes into contact with a curb or the like and the bottom surface of the oil pan is greatly depressed, the oil suction port may be blocked by the oil pan, and the oil may not be sufficiently guided to the oil pump. For this reason, the lubrication of the internal combustion engine becomes insufficient, and in the worst case, the vehicle cannot run. As a countermeasure, there is a type of protection that protects the lower part of the oil pan with a protective cover. However, in the case of RV (Recreation Vehicle) such as a four-wheel drive vehicle, when the bottom is hit by a rock etc. at the time of a mountain road or a crossing, the protective cover is passed through. The bottom of the oil pan may be dented, and the same may occur.
[0005]
Accordingly, the present invention has been made in view of the above-described conventional problems, and has been reviewed for the structure of the oil strainer, and to provide an oil strainer in which oil is sucked even when the oil pan is greatly recessed. With the goal.
[0006]
[Means for Solving the Problems]
Therefore, according to the first aspect of the present invention, at least the suction pipe is fixed to the suction pipe while covering the circumference of the suction pipe, and is mixed with the oil stored in the oil pan. A mesh member that filters foreign matter, and a movable pipe that is slidably fitted to the distal end of the suction pipe and is normally joined at a lower position where the fitting length is small, A first opening which is closed by the peripheral wall when the movable tube is at the lower position is formed in a peripheral wall of the distal end portion of the suction tube, and the movable tube is located at a lower position on the peripheral wall of the movable tube. When the movable pipe slides to the upper position above when the joint is released and the movable pipe slides to the upper upper position, a second opening is formed to be open in communication with the first opening. It is characterized by having.
[0007]
According to this configuration, when the oil pan is not deformed, the suction pipe and the movable pipe are joined and integrated at the lower position. At the lower position, the first opening and the second opening do not communicate with each other, so that the oil from which the foreign matter has been filtered by the mesh member is guided to the suction pipe from the opening at the distal end of the movable portion. On the other hand, when the bottom surface of the oil pan is deformed and largely recessed, the mesh member is deformed by the oil pan and the movable tube is pressed to the upper position with a strong force. When the movable tube is strongly pressed, the connection between the suction tube and the movable tube is released, the movable tube slides to the upper position, and the first opening and the second opening communicate and are opened. You. Therefore, even if the opening at the distal end of the movable tube is closed by the oil pan, the oil is guided to the suction tube through the first opening and the second opening.
[0008]
According to the second aspect of the present invention, the third wall closed by the suction pipe peripheral wall when the movable pipe slides to the upper position while the movable pipe is opened when the movable pipe is at the lower position. Are formed.
[0009]
According to such a configuration, when the deformation of the oil pan is small and the joint between the suction pipe and the movable pipe is not released, even if the opening at the tip end is closed by the oil pan, the oil pan can be moved through the third opening. Then, the oil is guided to the suction pipe.
[0010]
According to the third aspect of the present invention, when the movable tube slides to the upper position, the opening area in which the first opening and the second opening communicate with each other is equal to the opening area of the distal end opening of the movable tube. It is characterized by being set as described above.
[0011]
According to this configuration, when the movable pipe slides to the upper position, a sufficient oil suction amount is ensured so as not to hinder normal traveling.
The invention according to claim 4 is characterized in that the movable pipe is provided with a stopper which is locked to the suction pipe when the movable pipe slides to the upper position.
[0012]
According to this configuration, when the movable pipe slides to the upper position, the stopper is locked to the suction pipe, so that the fitting length of the movable pipe to the suction pipe is defined, and the first opening and the first opening are connected to each other. The deviation from the opening of the second opening is suppressed.
[0013]
The invention according to claim 5 is characterized in that a mesh member that covers the first opening is attached to the outer periphery of the suction pipe.
According to this configuration, since the mesh member that covers the first opening is attached to the outer periphery of the suction pipe, the foreign matter is filtered, and the oil containing the foreign matter is supplied to each part of the internal combustion engine. Is prevented.
[0014]
The invention according to claim 6 is characterized in that the fitting surface between the suction pipe and the movable pipe is provided with a rotation preventing means for preventing rotation of both.
According to this configuration, when the movable tube slides from the lower position to the upper position, the rotation is prevented, so that the first opening and the second opening are effectively prevented from being displaced from each other. Is done.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows the overall configuration of an internal combustion engine provided with an oil strainer according to the present invention.
[0016]
An oil pan 12 made of sheet metal is fastened to the lower surface of the cylinder block 10A of the internal combustion engine 10 with a gasket (not shown) interposed therebetween. The oil pan 12 is provided with an oil strainer 18 that guides oil to an oil pump 16 via an oil gallery 14 while filtering foreign substances such as sludge mixed in the oil stored therein.
[0017]
The oil strainer 18 includes, as shown in FIGS. 2 and 3, a suction pipe 20 that sucks the oil stored in the oil pan 12 and guides the oil to the oil gallery 14, and a mesh member 22 that filters foreign substances mixed in the oil. And a movable tube 24 that is slidably fitted to the inner periphery of the distal end portion of the suction tube 20. The suction pipe 20 has a flange at the base end fastened to the inlet of the oil gallery 14, and a tip extending in a substantially vertical direction is opened at the bottom of the oil pan 12. The mesh member 22 has a substantially dome-shaped wire mesh 22A having a predetermined mesh size and covers the periphery of the distal end portion of the suction pipe 20, and a substantially circular attachment that is fitted and fixed to the outer periphery of the suction pipe 20 while closing its opening. And a plate 22B. As shown in FIG. 2A, the movable pipe 24 is joined to the suction pipe 20 with an adhesive or the like at a lower position where the fitting length to the suction pipe 20 is small. As shown in FIG. 3B, when the movable tube 24 is disengaged from the suction tube 20 and slides upward, the movable tube 24 is locked to the suction tube 20 at the upper position. Thus, a large-diameter portion 24A as a stopper for defining the fitting length is formed.
[0018]
In the peripheral wall at the distal end portion of the suction pipe 20, there are four openings spaced apart by about 90 degrees in the circumferential direction with respect to the central axis thereof, and a first opening closed by the peripheral wall when the movable pipe 20 is at the lower position. 20A are respectively formed. On the other hand, when the movable tube 24 is at the lower position, it is closed by the peripheral wall of the suction tube 20, and when the movable tube 24 slides to the upper position, the first opening 20 </ b> A is formed on the peripheral wall of the movable tube 24. Second openings 24B that are open to communicate with each other are formed. Note that, like the first opening 20A of the suction pipe 20, the second opening 24B is formed at four positions separated by about 90 degrees in the circumferential direction with respect to the center axis of the movable pipe 24. In addition, a third opening is formed in the peripheral wall of the movable tube 24, which is opened when the movable tube 24 is at the lower position, and closed by the peripheral wall of the suction tube 20 when the movable tube 24 slides to the upper position. 24C is formed in an appropriate number.
[0019]
Here, the opening area of the distal end opening (oil suction port) of the movable pipe 24 is S ₁ , and when the movable pipe 24 slides to the upper position, the first opening 20A and the second opening 24B communicate with each other. when total opening area opening to set to S _2, so that the S ₁ ≦ S _2, it is desirable to determine the inner diameter and the opening area of the suction pipe 20 and the movable tube 24.
[0020]
Next, the operation of the oil strainer 18 having such a configuration will be described.
When the oil pan 12 is not deformed or extremely small, as shown in FIG. 2A, the suction pipe 20 and the movable pipe 24 are joined and integrated at a lower position. At the lower position, the first opening 20A and the second opening 24B are not in communication with each other, so that the oil from which foreign matter has been filtered by the mesh member 22 passes through the opening at the distal end of the movable section 24 and the third opening. It is led to the suction pipe 20 via 24C.
[0021]
On the other hand, when the bottom surface of the oil pan 12 is deformed and largely recessed, the wire net 22A of the mesh member 22 is deformed by the oil pan 12 and the movable pipe 24 is moved upward in the figure as shown in FIG. Pressed with strong force. When the movable tube 24 is strongly pressed, the function of the adhesive bonding the suction tube 20 and the movable tube 24 is impaired, and the movable tube 24 slides to the upper position defined by the large diameter portion 24A. Thus, the first opening 20A and the second opening 24B are communicated and opened. For this reason, even if the opening at the distal end of the movable tube 24 is closed by the oil pan 12, the oil from which foreign matter has been filtered by the mesh member 22 passes through the first opening 20A and the second opening 24B. Then, it is guided to the suction pipe 20. In this case, the opening area S ₁ of the end opening of the movable tube 24, which is the total opening area S ₂ when slid to the upper position, which is the S ₁ ≦ S _2, the oil suction amount Sufficiently secured, so that normal driving is not hindered.
[0022]
Further, when the bottom surface of the oil pan 12 is slightly deformed and the joint of the movable tube 24 is not released, even if the opening at the tip end is closed by the oil pan 12, the oil can be transmitted through the third opening portion 24C. Is led to the suction pipe 20. For this reason, by appropriately setting the total opening area of the third opening 24C, a sufficient amount of oil suction can be similarly secured, and normal driving can be prevented.
[0023]
Therefore, even when the oil pan 12 is depressed, it is possible to guide sufficient oil to the oil pump 16, and it is possible to avoid a situation in which running is impossible due to insufficient lubrication.
[0024]
In addition, in consideration of the possibility that the mesh member 22 may be damaged when the oil pan 12 is dented, a wire net as a mesh member that covers the first opening 20A may be attached to the outer periphery of the suction pipe 20. . In this way, even if the foreign matter cannot be filtered by the mesh member 22, the foreign matter is filtered by the wire mesh, so that the oil mixed with the foreign matter is prevented from being supplied to each part of the internal combustion engine 10, and, for example, It is possible to suppress abnormal wear of the sliding portion due to sludge.
[0025]
Further, in order to prevent relative rotation between the suction pipe 20 and the movable pipe 24, a convex part and a concave part are respectively formed on a fitting surface of both as a rotation preventing means, and these are fitted and slid in the axial direction. It may be configured. With this configuration, when the movable tube 24 slides from the lower position to the upper position, the rotation thereof is prevented, so that the first opening 20A and the second opening 24B can be shifted from each other. Can be prevented.
[0026]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the oil pan is deformed and greatly recessed, the movable tube slides to the upper position, and the first opening and the second opening are moved. Since the openings are communicated with each other, even if the opening at the distal end of the movable tube is closed by the oil pan, the oil can be guided to the suction tube. Therefore, it is possible to reliably avoid a situation in which traveling is impossible due to insufficient lubrication.
[0027]
According to the second aspect of the invention, when the deformation of the oil pan is small and the joint between the suction pipe and the movable pipe is not released, even if the opening at the distal end is closed by the oil pan, the third configuration is possible. The oil can be guided to the suction pipe through the opening.
[0028]
According to the third aspect of the present invention, it is possible to sufficiently secure the oil suction amount so as not to hinder normal traveling.
According to the fourth aspect of the present invention, the first opening and the second opening are prevented from being shifted from each other, and sufficient oil can be guided to the suction pipe.
[0029]
According to the fifth aspect of the present invention, it is possible to prevent oil mixed with foreign matter from being supplied to each part of the internal combustion engine, and it is possible to suppress, for example, abnormal wear of a sliding portion due to sludge.
[0030]
According to the invention described in claim 6, when the movable tube slides from the lower position to the upper position, the rotation is prevented, so that the first opening and the second opening are displaced. It can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an internal combustion engine provided with an oil strainer according to the present invention. FIG. 2 shows details of essential parts of the internal combustion engine, (A) is an explanatory diagram when a movable pipe is at a lower position, (B) ) Is an explanatory view when the movable tube is at the upper position.
12 Oil Pan 18 Oil Strainer 20 Suction Pipe 20A First Opening 22 Mesh Member 24 Movable Pipe 24A Large Diameter Portion 24B Second Opening 24C Third Opening

Claims (6)

A suction pipe having at least a distal end extending in a substantially vertical direction, a mesh member fixed to the suction pipe while covering the periphery of the distal end of the suction pipe, and filtering foreign substances mixed in oil stored in an oil pan; A movable pipe that is slidably fitted to the distal end of the pipe, and is always joined at a lower position where the fitting length is small,
A first opening which is closed by the peripheral wall when the movable pipe is at the lower position is formed in a peripheral wall of a distal end portion of the suction pipe, and the movable pipe is located at a lower position on the peripheral wall of the movable pipe. When the movable pipe is disengaged and slides to the upper position above, a second opening is formed to communicate with the first opening while being closed by the peripheral wall of the suction pipe. An oil strainer characterized by that: A third opening is formed in the peripheral wall of the movable tube, the third opening being closed when the movable tube is slid to the upper position while being closed when the movable tube is at the lower position. The oil strainer according to claim 1, wherein: When the movable tube slides to the upper position, the opening area where the first opening and the second opening communicate with each other is set to be equal to or larger than the opening area of the distal end opening of the movable tube. The oil strainer according to claim 1 or 2, wherein The oil strainer according to any one of claims 1 to 3, wherein a stopper is formed on the movable pipe, the stopper being locked to the suction pipe when the movable pipe slides to the upper position. . The oil strainer according to any one of claims 1 to 4, wherein a mesh member that covers the first opening is attached to an outer periphery of the suction pipe. The oil strainer according to any one of claims 1 to 5, wherein a rotation preventing means for preventing rotation of the suction pipe and the movable pipe is provided on a fitting surface of the suction pipe and the movable pipe.

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