JPS61220716A - Oil filtration device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To make convenient setting of sealing performance of title oil filtration device for the upstream side and the downstream side and to facilitate fitting operation of the device by constructing the device so as to have a sealing performance decided by the elasticity of the sealing member. CONSTITUTION:A filter 19 is installed to a crank case 1 by fixing temporarily by the fitting to a cover 18, and positioning of the cover 18 to the crank case 1 is executed simultaneously with the positioning of the filter 19 to the crank case 1. Further, the contact pressure of a sealing member 25 with an opening part 20 is set unambiguously by regulating the amt. of deformation of the sealing member 25 basing on the difference between the inside dia. of the opening part 20 and the outside dia. of the sealing member 25, thus, dependence of sealability between an oil ejecting part 24 of the filter 19 and the opening part 20 of the cover 18 on the attaching condition of the filter 19 is eliminated. The change of the amt. of deformation of the sealing ember 25 is also retarded to the minimum and stable sealing performance is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an oil filtration device for an internal combustion engine, and in particular,
This invention relates to an oil filtration device that is provided integrally with a crankcase.

"Prior Art" Conventionally, as an oil filtration device for an internal combustion engine, one having a structure shown in, for example, Japanese Patent Application Laid-Open No. 59710721 is known.

As shown in FIG. 1, in this technology, a filtration chamber 3 is formed by a cover 2 attached to the outside of the crankcase l, and an oil pump 4 is placed inside the wall of the crankcase l.
An oil inflow path 5 for sending unfiltered oil discharged from the filtration chamber 3 into the filtration chamber 3, and an oil outflow path 6 for feeding filtered oil from the filtration chamber 3 to each lubricating part of the internal combustion engine,
A cylindrical filter 7 for filtering oil is installed in the filtration chamber 3, and the cover 2 and filter 7
The cover 2 is fixed to the crankcase l by bolts 8, and the bolts 8 and both ends of the filter 7 are sealed with a sealing material 9, and the filter By pressing the sealing material 9 attached to one end of the filter 7 to the crankcase l by means of a resilient member 10 interposed between the filter 7 and the cover 2, the filter chamber 3 is opened in the radial direction through the filter 7. Furthermore, the mounting has a configuration in which a communication passage [l] is formed inside the bolt 8 to communicate the inside of the filter 7 and the oil outflow path 6.

Then, the unfiltered oil sent from the oil inflow path 5 into the filtration chamber 3 is filtered by passing from the outer periphery to the inner periphery of the filter. From the inside of the filter 7 to the oil outflow path 6 via the passage 11, and further into the oil outflow path 6.
The lubricant is supplied to each lubricating part of the internal combustion engine.

"Problems to be Solved by the Invention" The present invention aims to solve the following problems remaining in the conventional techniques described above.

That is, by pressing the filter 7 with the elastic member 10 interposed between the cover 2 and the filter 7 and bringing the sealing material 9 into pressure contact with the crankcase l, the gap formed on the outer circumferential side of the filter 7 and Although the sealing performance between the oil outlet passage 6 and the oil outlet path 6 is maintained, the characteristics of the sealing performance depend on the physical properties of the resilient member 10 and the dimensions of the assembly, and when the former physical properties are kept constant. Even in the case of the latter assembly, the dimensions of the cover 2, the filter 7, the dimensions of the bolts 8, and the tightening of the bolts 8 vary depending on the conditions, so the sealing performance described above cannot be achieved. Setting a constant value tends to be a complicated task.

"Means for Solving the Problems" The present invention provides an oil filtration device for an internal combustion engine that effectively solves the problems in the conventional technology described above and can further improve ease of assembly and filtration performance. In particular, the oil filtration device for an internal combustion engine is provided with an oil supply passage having an opening communicating with the filtration chamber in a cover that forms a filtration chamber together with the crankcase, and is installed in the filtration chamber. An oil discharge part is provided on an upper lid provided at one end of the cylindrical filter and closes the one end, and the oil discharge part fits into the opening to establish communication between the opening and the inside of the filter,
Further, a sealing member made of an elastic material is provided between the oil discharge portion and the opening portion to seal the space between the two when the two are fitted, and the oil discharge portion and the oil discharge portion Fitting with the other includes the case where the former is inserted into the inside of the latter, and vice versa.

"Function" By having the above-described configuration, the present invention makes the sealing performance dependent on the elasticity of the sealing member when sealing the upstream side and the downstream side of the filter, making it easy to set the sealing performance, and , the installation is to facilitate operation.

"Embodiment" Hereinafter, a preferred embodiment of the present invention will be described in detail based on FIGS. 2 and 3. Note that the same reference numerals are used for parts common to those in the Middle East Figure 1 in the following explanation to simplify the explanation.

Reference numeral 12 in FIG. 2 indicates an internal combustion engine to which one embodiment is applied, and includes a crankshaft 13 that is rotatably mounted in the crankcase l and drives the oil pump 4; It has a connecting rod 15 connected via a crank pin 14, and an internal combustion engine oil filtration device (hereinafter abbreviated as filtration device) 16 according to this embodiment is provided on the outside of the crankcase 1.

First, the outline of the filtration device 16 will be explained. A cover 18 is attached to the outside of the crankcase l and forms a filtration chamber 17 between it and the crankcase 1, and a cover 18 is attached to the inside of the filtration chamber 17. and a cylindrical filter 19 through which oil sent into the filtration chamber 17 passes, and the cover 18 has an opening 2 communicating with the filtration chamber 17.
0 and supplies the oil to each part of the internal combustion engine 12, the filter 19 is provided with a lower lid 22 and an upper lid 23 that close both ends of the filter 19, and the upper lid 23 has the Opening 2 of oil supply passage 21
An oil discharge part 24 is provided which fits into the oil supply passage 21 and the inside of the filter 19, and which is fitted between the oil discharge part 24 and the opening part 20. A sealing member 25 made of an elastic material is provided to seal the space between the two when the two are opened.

Next, in detail, a recessed portion opening outward is formed in the crankcase 1, and the cover 18 is fixed to cover the recessed portion.

The cover 18 is provided with a concave portion that is continuous with the concave portion of the crankcase l and forms a filtration chamber 17, and
An oil supply passage 21 having the opening 20 is formed in the wall. The opening 20 has a communication hole 20a that communicates with the filtration chamber 17 at its central position, and the oil supply passage 21 extends inside the wall of the crankcase l, the crankshaft 13, and the crankpin 14. The crank pin 14 is connected to the rotating part of the crankshaft 13, or it is connected to the camshaft, for example, through the wall of the cylinder block 27 provided integrally with the crankcase l or the wall of the cylinder head (not shown). It is connected to the sliding contact part with the intake and exhaust valves.

The lower lid 22 that closes one end of the filter 19 has one end of the filter 19 formed into a dish shape, which is tightly fitted into the lower lid 22, and a through hole 28 formed in the center of the bottom of the lower lid 22. At the same time, a protrusion 29 is provided on the peripheral edge of the through hole 28 and protrudes outward. Further, a flange 30 having substantially the same shape as the inner circumference of the recess of the crankcase l is curved on the outer circumference of the lower lid 22.

On the other hand, the upper lid 23 that closes the other end of the filter 19 is formed into a dish shape like the lower lid 22, and the other end of the filter 19 is tightly fitted, and there is a gap between the upper lid 23 and the lower lid 22. is opened to expose the outer peripheral surface of the filter 19. Further, at the center of the upper lid 23, an oil discharge part 24 is provided that projects outward and has an outer diameter smaller than the inner diameter of the opening 20 and has a communication hole 24a that communicates between the inside and outside of the filter 19. The oil discharge portion 24 has a protruding length that provides a sufficient fitting distance with the opening 20 of the cover 18 when the other end of the filter 19 is in contact with the crankcase l. It is said that moreover,
A sealing member 25 having an outer diameter larger than the inner diameter of the opening 20 is integrally attached to the outer peripheral surface thereof.

The seal member 25 is made of an elastically deformable material such as rubber, and has an oil discharge portion 24 on its outer periphery.
A plurality of contact pieces 31 are arranged in succession at intervals in the length direction and over the entire circumference.

Further, in the recessed portion of the crankcase l, a bulging portion 32 consisting of a protrusion or a protrusion that contacts the protrusion 29 of the lower cover 22 from the inner circumferential side is provided.
An opening/closing plate 33 that closes the through hole 28 of the lower lid 22 and an elastic member 34 that always presses the opening/closing plate 33 in the closing direction are provided inside the opening/closing plate 33 and the elastic member 9. The through hole 28 is normally closed by the member 34, and is opened when the pressure outside the filter 19 is increased to a set value or more, so that the inside and outside of the filter 19 communicate with each other. ing.

Therefore, the filtration device 1 of this embodiment configured in this way
6 inserts the filter 19 into the cover 18 from the oil discharge part 24 side, and then inserts the filter 19 into the cover 18 from the oil discharge part 24 side.
The cover 18 and the crankcase l can be temporarily fixed by fitting into the opening 20 of the cover 18, and then assembled by aligning the cover 18 and the crankcase l with each other and connecting them with bolts 26.

In this type of assembly, during operation, the filter 19 can be assembled to the crankcase l in a state in which it is temporarily fixed by fitting with the cover 18, and it is also possible to assemble the filter 19 to the crankcase l in a state in which it is temporarily fixed by fitting the cover 18 and the crankcase l. Accordingly, the crankcase l
The bulging part 32 of the filter 19 is engaged with the inner peripheral part of the protrusion 29 of the filter 19, and the positioning of the filter 19 with respect to the crankcase l can be performed at the same time, so that assembly can be carried out by a simple operation. can.

After the filter 1.9 is assembled as described above, one end of the filter 1.9 is engaged with the protrusion 29 and the bulging part 32, and the other end is connected to the oil discharge part 24 and the opening. By being supported by fitting with the portion 20, it is reliably set at a predetermined position within the filtration chamber 17. Furthermore, when fitting the oil discharge part 24 into the opening 20, the contact piece 31 of the seal member 25 moves toward the rear in the insertion direction of the oil discharge part 24, as shown by the chain line and solid line in FIG. Since the filter 19 is bent and deformed, the restoring force acts to press the filter 19 toward the crankcase 1, suppressing the longitudinal movement of the filter 19 and maintaining the above-mentioned mounting condition. Furthermore, the contact pressure of the sealing member 25 against the opening 20 is uniquely determined based on the amount of deformation of the contact piece 31 caused by the difference between its outer diameter and the inner diameter of the communication hole 20a of the opening 20. The amount of deformation is almost unaffected by the installation condition of the filter 19;
Further, even if the filter 19 itself is moved relative to other components due to vibrations of the internal combustion engine 12, the seal member 25 has already been deformed by the necessary amount, and the oil discharge portion 24 and the opening Since the dimensional difference in the radial direction with the section 20 is regulated, changes in the amount of deformation of the contact piece due to the movement of the filter 19 are suppressed to a minimum, thereby ensuring a constant contact pressure and discharging oil. Part 24
The sealing performance between the opening 20 and the opening 20 is maintained in a stable state.

On the other hand, the oil sent into the filtration chamber 17 from the oil pump 4 is filtered while passing from the outer circumferential side to the inner circumferential side of the filter 19. The oil is supplied to each lubricating part of the internal combustion engine 12 through the communication hole 20a and the oil supply passage 21. In this oil supply state, clean oil is supplied to each lubricating part because the outer circumference of the filter 19 and the oil supply passage 21 are reliably sealed as described above. If the pressure of the oil sent to the filtration chamber 17 exceeds the set value for some reason,
When the opening/closing plate 33 is moved against the elastic force of the elastic member 34 and the through hole 28 is opened, the oil is allowed to flow directly into the filter 19 so as to bypass the filter 19. , abnormal pressure rise within the filtration chamber 17 is suppressed.

FIG. 4 shows another embodiment of the present invention, in which a cover 18
The opening 35 provided in the filter chamber 17 is provided with an opening 35 protruding toward the inside of the filter chamber 17, and has an outer diameter that can be inserted into the inside of the oil discharge part 36 formed in the upper lid 23 of the filter 19. The opening 35 is provided on the inner circumference of the discharge portion 36.
A seal member 37 is integrally attached to the outer circumferential surface of the seal member 37, which is in elastic contact with the entire circumference. And filter 19
A resilient member 38 that presses the filter 19 toward the cover 18 is interposed between the filter 19 and the crankcase l.

With this configuration, the amount of deformation of the seal member 37 is regulated by the difference in the inner and outer diameters between the opening 35 and the oil discharge portion 36, and the oil The sealed state between the discharge portion 36 and the discharge portion 36 can be maintained constant at all times. Further, the seal member 37
When the sealing member 37 is formed into a cylindrical shape as shown in the figure, the sealing member 37
In addition, it is difficult to produce the effect of pressing the filter 19 toward the crankcase l like the contact piece 31 of the seal member 25 in the embodiment described above, and it becomes impossible to automatically correct the filter 19 after changing its position. However, the resilient member 38 is interposed to assist this. However, the resilient member 38 does not affect the contact pressure generated in the seal member 37 with the opening 35.

Note that the detailed shapes and dimensions of each component shown in the above embodiments are merely examples, and can be variously changed based on design requirements and the like. For example, as shown by the chain line in FIG. 2, ribs 39 are provided on the inner wall of the filtration chamber 17 to
9 may be assembled in the opposite direction, a flange 30 provided on the lower lid 22 may be engaged to prevent assembly.

"Effects of the Invention" As explained above, according to the oil filtration device for an internal combustion engine according to the present invention, the cover that forms the filtration chamber together with the crankcase is provided with an oil supply passage having an opening communicating with the filtration chamber. , an oil discharge that is provided at one end of the cylindrical filter installed in the filtration chamber and that fits into the opening and forms a communication between the opening and the inside of the filter; and an upper lid that closes the one end. A sealing member made of an elastic material is provided between the oil discharge part and the opening to seal the space between the oil discharge part and the opening when the two are fitted together. It has excellent effects.

The filter can be assembled to the crankcase in a temporarily fixed state by fitting with the cover, and the filter can be positioned with respect to the crankcase at the same time as the cover and the crankcase are aligned, making it simple. Assembling can be carried out with simple work.

In addition, the amount of deformation of the sealing member is regulated by the difference between the inner diameter of the opening and the outer diameter of the sealing member, thereby uniquely setting the contact pressure of the sealing member against the opening, and controlling the oil discharge part of the filter and the cover. The sealing between the filter and the opening prevents the installation of the filter from being affected by the condition, and even if the filter itself is moved relative to other components due to vibrations of the internal combustion engine, etc. Changes in the amount of deformation of the sealing member can be minimized, thereby maintaining stable sealing performance.

[Brief explanation of drawings]

In the middle of the drawings, Figure 1 is a longitudinal cross-sectional view of the main parts of a conventional oil filtration device for an internal combustion engine, and Figures 2 and 3 show an embodiment of the present invention. Longitudinal cross-sectional view of the section,
FIG. 3 is an enlarged view showing the fitting portion between the oil discharge portion and the opening, and FIG. 4 is a longitudinal cross-sectional view of the main part showing another embodiment of the present invention. 1... Crank case, 4... Oil pump, 12
... Internal combustion engine, 16 ... Filtration device, 17 ... Filter chamber, 18 ... Cover, 19 ... Filter, 20.3
5... Opening, 20a... Communication hole, 21... Oil supply passage, 22... Lower lid, 23... Upper lid, 24
・36...Oil discharge part, 25.37...Seal member.

Claims (3)

[Claims] (1) A cover that is attached to the crankcase of an internal combustion engine and forms a filtration chamber between the crankcase and the cylindrical filter that is attached to the filtration chamber and allows oil sent into the filtration chamber to pass therethrough. The cover is provided with an oil supply passage having an opening that communicates with a filtration chamber and supplies the oil to each part of the internal combustion engine, and the filter is provided with a lower lid and an upper lid that respectively close both ends of the oil supply passage. an oil discharge part is provided in the upper lid to fit into the opening of the oil supply passage to establish communication between the oil supply passage and the inside of the filter; An oil filtration device for an internal combustion engine, characterized in that a sealing member made of an elastic material is provided between the two to seal the gap between the two when the two are fitted. (2) The oil filtration device for an internal combustion engine according to claim 1, wherein the oil discharge portion is provided to protrude outward from the filter so as to be inserted into the opening. (3) The oil filtration device for an internal combustion engine according to claim 1, wherein the opening is provided so as to protrude toward the inside of the filtration chamber so as to be inserted into the oil discharge portion.