JP2010048143A - Baffle plate for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a baffle plate for an internal combustion engine, which sufficiently removes air bubbles in oil that is refluxed into an oil pan, and is configured in a compact manner. <P>SOLUTION: The baffle plate 11 for the internal combustion engine is arranged to partition a crankcase side and an oil pan 1 side. An oil reception 15 is located on one side 12 of the oil pan 1 above which an oil return passage of a cylinder block is arranged. An oil stream bottom 14 is inclined downward toward the opposite side of an arrangement side of an oil strainer 6 arranged at a lower level than a virtual plane connecting both sides 11, 12 in a central part sandwitched by both sides 11, 12, and at one end of a longitudinal direction of the oil pan 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a baffle plate for an internal combustion engine, and more particularly to a baffle plate for an internal combustion engine that is disposed in an oil pan and exhibits high bubble separation performance.

  In an internal combustion engine, lubricating oil collected in an oil pan is sucked through an oil strainer, supplied to a required lubricating portion by an oil pump and lubricated, and then the oil is formed in a cylinder block. It is configured to return to the oil pan through the return passage. However, the oil is agitated by the crankshaft system that rotates at high speed, or the oil pressure is swelled by the wind pressure generated by high-speed rotation, and bubbles are trapped in the oil, resulting in oil mixed with a large amount of air. Therefore, when such oil is sucked with an oil pump, the pump efficiency is remarkably deteriorated, resulting in poor lubrication. Therefore, a baffle plate having a shape that partitions the crankroom side and the oil pan side is conventionally arranged on the oil pan.

  In addition, even if the oil falls directly into the oil pan from the opening of the oil return passage, air bubbles are easily caught, and a large amount of air is mixed in the oil, resulting in the same problem. As a countermeasure, there has been known a technique in which the refluxed oil is once received by a baffle plate disposed in an oil pan and the oil is dropped from the baffle plate to the oil pan. Specifically, the oil that has fallen from the oil return passage is received at one side of the baffle plate that faces the lower side of the opening of the oil return passage, and the oil is moved downward on the baffle plate that is inclined downward toward the other side. It is known that it flows down and returns to the oil pan from an opening formed on the other side of the baffle plate (see, for example, Patent Document 1).

In addition, the baffle plate is formed in a spherical shape protruding upward, the oil strainer opening is formed at the highest position, the oil drain hole is formed at the lower position of the peripheral edge of the baffle plate, and the oil drain hole is formed. There is known one provided with a bead oriented toward the surface (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 9-68024 JP-A-10-159528

  However, in the configuration where the baffle plate shaped to partition the crankroom side and the oil pan side is arranged, a large amount of air is mixed into the oil at the part where the oil falls directly into the oil pan from the opening of the oil return passage. Therefore, there is a problem that the pump efficiency is remarkably deteriorated to cause lubrication failure.

  Further, in the configuration disclosed in Patent Document 1, the oil received on one side portion of the baffle plate is caused to flow down in the width direction toward the other side portion, and thus is generated by high-speed rotation of the crankshaft system. There is a risk that the oil will flow down quickly due to the wind pressure, and the air bubbles that are trapped when falling onto the baffle plate from the oil return passage will enter the oil pan and be sucked from the oil strainer without being sufficiently separated and removed. There is a problem that the pump efficiency is remarkably deteriorated and the lubrication is poor. Furthermore, if a sufficient distance is not ensured between the crankshaft system and the inclined baffle plate, the oil flowing down on the baffle plate will be agitated or violently swirled, resulting in more air. Because there is a risk of being mixed, the distance in the height direction between the crankshaft and the other side of the baffle plate must be increased, and it is impossible to achieve both compact configuration and bubble separation action. There is also a problem.

  Further, even in the configuration disclosed in Patent Document 2, it is necessary to secure a sufficient distance between the spherical baffle plate protruding upward and the operation locus of the crankshaft system. There is a problem that you can not.

  An object of the present invention is to provide a baffle plate for an internal combustion engine that can sufficiently separate and remove air bubbles in oil that flows back to an oil pan and that can be configured compactly. And

  The baffle plate of the internal combustion engine of the present invention is a baffle plate of the internal combustion engine arranged so as to partition the crankcase side and the oil pan side, and the oil is passed through the cylinder block in both side portions extending in the longitudinal direction of the oil pan. An oil receiving portion is provided in at least one of the openings of the oil return passage for returning oil to the pan, and the oil pan is lower than the virtual plane connecting the both side portions at the center portion sandwiched between the both side portions. The oil flow lower part which inclines below toward the opposite side to the arrangement | positioning side of the oil strainer arrange | positioned at the one end part of this longitudinal direction is provided.

  According to this configuration, the oil that has flowed down from the opening of the oil return passage of the cylinder block is received with less foaming at the oil receiving portion, and then the oil pan on the lower portion of the oil flow is orthogonal to the rotation direction of the crankshaft system. It flows into the oil pan and flows into the oil pan, and further flows in the oil pan in the direction opposite to the flow direction at the bottom of the oil flow, and then sucked into the oil strainer. And a sufficient moving distance and time can be secured, and bubbles in the oil can be sufficiently separated and removed. In addition, since the oil flow direction at the lower part of the oil flow is orthogonal to the rotation direction of the crankshaft system, it is not easily affected by wind pressure generated by the rotation of the crankshaft system. While setting the distance between the trajectory and the baffle plate small to achieve a compact configuration, it is possible to achieve an effect that bubbles in the oil can be sufficiently separated and removed.

  In addition, if the oil flow lower part is provided with a concave part extending in the longitudinal direction of the oil pan and inclined downward toward the side opposite to the oil strainer arrangement side, the oil flows in the concave part when flowing through the oil flow lower part. And the inside of the recess is not easily affected by wind pressure due to the rotation of the crankshaft system, so even if the distance between the operation locus of the crankshaft system and the oil pan is reduced, There is no fear that air is mixed by being diffused, and a desired bubble separation action can be ensured while having a more compact configuration.

  In addition, if a rising edge is provided on the periphery excluding the edge that causes the oil to fall into the oil pan, the oil on the baffle plate can be reliably prevented from dropping into the oil pan by shortcutting the lower part of the oil flow. It can be played reliably.

  According to the baffle plate of the internal combustion engine of the present invention, the oil that has flowed down from the oil return passage is received by the oil receiving portion with less foaming, and then flows over the lower part of the oil flow in the longitudinal direction of the oil pan. Then, the flow direction is changed in the opposite direction in the oil pan, and then sucked into the oil strainer. The oil flow direction at the lower part of the oil flow is perpendicular to the rotation direction of the crankshaft system and is not easily affected by wind pressure generated by the rotation of the crankshaft system. The distance between the movement locus of the shaft system and the baffle plate can be set to be small and can be configured compactly.

  Hereinafter, an embodiment of a baffle plate of an internal combustion engine of the present invention will be described with reference to FIGS.

  1 to 4, reference numeral 1 denotes an oil pan in an internal combustion engine, and a joint surface 1a at the upper end thereof is joined to a lower surface of a cylinder block (not shown). In the cylinder block (not shown), a plurality of (three in the illustrated example) oil return passages 2a to 2c are provided at appropriate intervals in the longitudinal direction on one side portion orthogonal to the longitudinal direction of the crankshaft (not shown). Is formed. In FIG. 4, 3 is the crankshaft axis, 4a is the operation locus of the crankshaft (counterweight portion), and 4b is the operation locus of the connecting rod.

  As shown in FIGS. 1 and 3, the oil pan 1 has an oil reservoir portion 5 formed deeply at one end on the front side of the vehicle, and an intake port of an oil strainer 6 attached to one end wall 1 a of the oil pan 1. 6 a is open at the bottom of the oil reservoir 5. The bottom wall 1 c of the oil pan 1 is formed so as to be gently inclined downward from the other end in the longitudinal direction of the oil pan 1 toward the oil reservoir 5, and from the position near the oil reservoir 5 to the oil reservoir 5. The bottom wall 1c is appropriately provided with control ribs 7 for controlling the flow rate of oil.

  On both side walls 1d and 1e of the oil pan 1, a plurality of mounting bosses 8a and 8b for supporting both side portions of the baffle plate 11 are provided so as to rise from the bottom wall 1c at appropriate intervals in the longitudinal direction. Yes. The heights of the mounting bosses 8a and 8b are set so that the virtual plane 10 connecting the upper mounting surfaces 9a and 9b does not interfere with the lower ends of the operation paths 4a and 4b of the crankshaft system.

  As shown in FIGS. 1 to 7, particularly FIGS. 5 to 7, the baffle plate 11 is disposed from one end of the oil pan 1 to a position near the other end. In addition, one of the two side portions 12 and 13 extending in the longitudinal direction of the oil pan 1 and located below the opening of the oil return passage 2 is arranged at a position higher than the other side portion 13. . And the center part pinched | interposed between these both side parts 12 and 13 is lower than the virtual plane 10 which ties both side parts 12 and 13, and arrangement | positioning of the oil strainer 6 arrange | positioned at the one end part of the longitudinal direction of the oil pan 1 An oil flow lower portion 14 that is inclined downward by an appropriate angle α (for example, about 1 ° to 2 °) toward the side opposite to the side is provided. One side portion 12 arranged at a high position so that the distance from the opening of the oil return passage 2 is short, and an inclined portion that gently slopes from the one side portion 12 toward the oil flow lower portion 14. An oil receiving portion 15 is configured to receive the oil flowing out from the oil return passage 2 with less foaming.

  The oil flow lower portion 14 has two groove shapes extending in the longitudinal direction of the oil pan 1 and inclined downward by an appropriate angle α (for example, about 1 ° to 2 °) toward the side opposite to the side where the oil strainer is disposed. The recesses 16 are arranged in parallel with each other at an appropriate interval, and the oil flows through these recesses 16. Further, both concave portions 16 are formed with one end at a position corresponding to the oil return passage 2a closest to the oil strainer 6 on the other end side from the one end portion where the oil strainer 6 of the baffle plate 11 is disposed. The baffle plate 11 is opened at the other end. These recesses 16, 16 are mutually connected by transverse recesses 17, 17 formed so that both ends reach both sides 12, 13 in the width direction of the baffle plate 11 at a position at an appropriate distance from one end position and the other end. It is connected.

  At one end of the baffle plate 11, a notch 18 is provided on one side to form a space for inserting the oil strainer 6 into the oil reservoir 5, and an auxiliary recess 19 is provided at the center in the width direction toward the transverse recess 17. Is formed. Further, in order to increase the surface rigidity of the other end portion of the oil flow lower portion 14, it is formed in a shape slightly lifted upward including the concave portion 16 from the other end to an appropriate distance. An oil relief hole 20 is provided at the lowest position of the generated recess 16.

  On the peripheral edge of the baffle plate 11, a rising edge portion 21 is formed over substantially the entire circumference except for the other end edge that drops the oil onto the oil pan 1. On both side portions 12 and 13 of the baffle plate 11, reinforcing plates 22 and 23 are arranged and fixed in order to increase the strength against fatigue caused by the vibration of the baffle plate 11 in resonance with the vibration during operation of the internal combustion engine. A mounting bolt hole 24 is formed through the reinforcing plates 22 and 23 and the side portions 12 and 13. On one side portion 12 of the baffle plate 11, bolt holes 24 are disposed at two locations near both ends, and correspondingly, mounting bosses 8 a on the oil pan 1 side are disposed, and on the other side portion 13 of the baffle plate 11. Bolt holes 24 are arranged at three locations near both ends and in the central portion, and correspondingly, mounting bosses 8b on the oil pan 1 side are disposed, and these both side portions 12, 13 are passed through the respective bolt holes 24. 25 is fastened and fixed to the mounting surfaces 9a and 9b of the mounting bosses 8a and 8b. In addition, in the vicinity of the fastening and fixing portion by the mounting bolts 25 on both side portions 12 and 13 of the baffle plate 11, a cut portion 21 a is formed by cutting off the rising edge portion 21, thereby preventing the occurrence of cracks due to stress concentration. Has been.

  According to the baffle plate 11 of the internal combustion engine having the above-described configuration, the oil flowing down from the opening portions of the oil return passages 2a to 2c of the cylinder block, as indicated by arrows in FIG. After being received by the oil receiving portion 15 with less foaming, it flows on the oil flow lower portion 14 in the longitudinal direction of the oil pan 1 perpendicular to the rotation direction of the crankshaft system and flows into the oil pan 1. Since the oil flows in the direction opposite to the flow direction in the oil flow lower part 14 and then flows into the oil reservoir 5 and is sucked into the oil strainer 6 from the bottom of the oil reservoir 5, the bubbles are separated. A sufficient moving distance and time are ensured, and bubbles in the oil can be sufficiently separated and removed. In addition, since the other end of the baffle plate 11 extends to a shallow position near the other end of the oil pan 1, it is possible to reduce the drop and reduce foaming when flowing into the oil pan 1 from the tip of the oil flow lower portion 14. Can do.

  In addition, since the oil flowing direction in the oil flow lower portion 14 is orthogonal to the rotation direction of the crankshaft system, it is hardly affected by wind pressure generated by the rotation of the crankshaft system. While setting the distance between the operation trajectories 4a and 4b and the baffle plate 11 to be small and making the internal combustion engine compact, there is an effect that bubbles in the oil can be sufficiently separated and removed. Also, the baffle plate 11 has an oil flow lower portion 14 between both side portions 12 and 13 recessed downward so as to substantially follow the operation locus 4a and 4b of the crankshaft system. The arrangement position of the baffle plate 11 can be made high while ensuring a required interval between the portions 14, and the height dimension of the internal combustion engine can be made compact accordingly.

  Furthermore, since the oil flow lower portion 14 is provided with a recess 16 that extends in the longitudinal direction of the oil pan 1 and is inclined downward toward the side opposite to the side where the oil strainer 6 is disposed, the oil flows through the oil flow lower portion 14. In this case, the distance between the operation loci 4a and 4b of the crankshaft system and the oil pan 1 is reduced. Even in this case, there is no fear that the oil flowing through the oil flow lower portion 14 is diffused by wind pressure or the like and air is mixed therein, and a desired bubble separation action can be ensured with a more compact configuration.

  In addition, since the plurality of recesses 16 are formed in parallel, a required amount of oil can be allowed to flow without increasing the depth of each recess 16 and the configuration can be made compact. Since the transverse recess 17 and the auxiliary recess 19 are formed, the surface rigidity of the baffle plate 11, particularly the oil flow lower portion 14, can be increased, and the occurrence of vibration is effectively suppressed while using a thin plate material. be able to.

  Further, since the rising edge 21 is provided at the peripheral edge of the baffle plate 11 except for the other end of the baffle plate 11 that drops the oil into the oil pan 1, the oil on the baffle plate 11 shortcuts the oil flow lower part 14. Thus, the oil pan 1 can be reliably prevented from falling, and the above-described effects can be reliably achieved.

  In the baffle plate of the internal combustion engine of the present invention, the oil flowing down from the oil return passage is received with less foaming at the oil receiving portion, flows on the lower part of the oil flow in the longitudinal direction of the oil pan, and further in the reverse direction in the oil pan. Since it is sucked into the oil strainer after flowing in the direction of the flow, a sufficient moving distance and time are secured to separate the bubbles, and the bubbles in the oil can be sufficiently separated and removed, and the lower part of the oil flow The oil flow direction in the cylinder is perpendicular to the rotation direction of the crankshaft system and is not easily affected by wind pressure generated by the rotation of the crankshaft system. Since it can be set to a small and compact configuration, and it can achieve both separation and removal of bubbles and a compact configuration, it can be used for various internal combustion engines, especially for vehicles. It can be suitably used in the combustion engine.

The disassembled perspective view which shows schematic structure of the oil pan of one Embodiment of the internal combustion engine which arrange | positioned the baffle plate of this invention. The top view of the oil pan of the internal combustion engine of the embodiment. AA arrow sectional drawing of FIG. BB arrow sectional drawing of FIG. The top view which shows the baffle plate in the same embodiment. CC sectional view taken on the line of FIG. DD sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil pan 2a-2c Oil return path 6 Oil strainer 10 Virtual plane 11 Baffle plate 12 One side part 13 Other side part 14 Oil flow lower part 15 Oil receiving part 16 Recessed part 21 Standing edge part

Claims (3)

A baffle plate for an internal combustion engine arranged to partition the crankcase side and the oil pan side,
An oil receiving portion is provided in at least one of the both sides extending in the longitudinal direction of the oil pan, the opening of the oil return passage for returning the oil to the oil pan through the cylinder block is disposed above,
An oil flow that is inclined downward toward the opposite side of the oil strainer arrangement side, which is lower than the imaginary plane connecting the both side parts and disposed at one end in the longitudinal direction of the oil pan, at the center part sandwiched between both side parts A baffle plate for an internal combustion engine, characterized in that a portion is provided. 2. A baffle plate for an internal combustion engine according to claim 1, wherein a concave portion that extends in the longitudinal direction of the oil pan and inclines downward toward the side opposite to the side on which the oil strainer is disposed is provided in the oil flow lower portion. 3. A baffle plate for an internal combustion engine according to claim 1, wherein a rising edge portion is provided at a peripheral edge excluding an edge where oil is dropped into an oil pan.

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