JP4016932B2 - Baffle plate for vehicle engine - Google Patents

Description

  The present invention relates to a baffle plate for a vehicle engine provided between a crankshaft provided in a vehicle engine and an oil pan for storing lubricating oil supplied to each part in the vehicle engine.

  Conventionally, the lubricating oil supplied to each part in the vehicle engine is stored in an oil pan provided in the lower part of the engine. The stored stored lubricating oil is pumped up by an oil pump, filtered and purified by an oil filter, and then supplied again to each part in the engine. A plate called a baffle plate is provided between the oil pan and the crankshaft to prevent the stored lubricating oil from shifting. Usually, the baffle plate is formed with an oil drain hole for discharging the lubricating oil dropped from above into the oil pan.

  Here, a part of the lubricating oil supplied again is also used for hydraulic equipment provided in the engine, for example, a lash adjuster. When bubbles (air) are mixed in the lubricating oil used in such hydraulic equipment, abnormal behavior of the hydraulic equipment is induced. That is, a part of the lubricating oil stored in the oil pan is also supplied to the hydraulic equipment, but if bubbles are mixed in the lubricating oil, an abnormal behavior of the hydraulic equipment is caused. Therefore, it is desirable that bubbles (air) are not mixed in the lubricating oil stored in the oil pan as much as possible.

  In order to solve such a problem, in Patent Document 1, a baffle plate is provided with a baffle plate protruding from the lower surface of the oil pan, and the baffle plate has an oil recovery hole at a position immediately after the baffle plate in the rotation direction of the crankshaft. An oil pan apparatus provided with the above is disclosed. This prevents collision between the lubricating oil accumulated on the baffle plate and the rotating crankshaft, and prevents generation of bubbles in the lubricating oil discharged to the oil pan.

  According to the above configuration, the lubricating oil accumulated on the baffle plate is quickly discharged to the oil pan by the rotating air generated by the rotation of the crankshaft. Therefore, collision between the crankshaft and the lubricating oil can be prevented, and bubbles in the lubricating oil discharged to the oil pan can be reduced.

Japanese Patent Laid-Open No. 10-61488

  However, in the above configuration, the lubricating oil is vigorously dropped into the oil pan by the rotating air. Therefore, there is a problem that new bubbles are generated in the lubricating oil in the oil pan due to the drop impact. Further, there is a possibility that bubbles are generated in the lubricating oil in the oil pan due to the rotating air flowing into the oil pan from the oil dropping hole.

  Therefore, an object of the present invention is to provide a baffle plate that can reduce bubbles in the lubricating oil stored in the oil pan.

A baffle plate for a vehicle engine according to the present invention includes a baffle for a vehicle engine provided between a crankshaft provided in the vehicle engine and an oil pan for storing lubricating oil supplied to each part in the vehicle engine. The baffle plate has a plurality of oil dropping holes for discharging the lubricating oil dropped on the upper surface of the baffle plate to the oil pan, and the oil dropping holes are arranged at both ends in the direction of the rotation axis of the crankshaft. The closer it is to the part, the larger .

In a preferred embodiment, prior Symbol baffle plate has a flange portion on the rotation upstream side end portion, the flange portion of the rotation upstream side end portion is bent folded upwards along the way. Moreover, it is desirable that the flange portion at the end portion on the downstream side of the rotation is bent downward in the middle thereof.

In another preferred embodiment, about a vertical line passing through the rotation center point of the front Symbol crankshaft, the total area of the rotational downstream side becomes disposed on one side oil flow hole of the crankshaft, the rotational upstream side It is desirable that it is larger than the total area of the oil drain holes provided in .

  According to the present invention, bubbles in the lubricating oil stored in the oil pan can be reduced.

    Hereinafter, a baffle plate according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a top view of a baffle plate 10 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 3 is a sectional view taken along the line BB in FIG. 1, and FIG. 4 is a sectional view taken along the line CC in FIG.

  The baffle plate 10 is used for a vehicle engine, and is formed by press-molding a relatively thin metal plate. This is provided between the crankshaft 40 and the oil pan 50, as shown in FIG. The baffle plate 10 has a main body portion 12 and flange portions 14a and 14b protruding on both sides thereof. In addition, a cutout portion 28 for arranging a strainer (not shown) is provided at one corner.

  As is apparent from FIGS. 3 and 4, the main body 12 has an arcuate longitudinal section that protrudes downward. Further, oil dropping holes 18 and 20 for discharging the dropped lubricating oil to the oil pan 50 are formed on the upper surface. In addition, the flange portions 14 a and 14 b protrude from both sides and are fastened to the bottom surface of the bearing cap 70. Accordingly, the flange portions 14a and 14b are provided with fastening holes 24 that are fastening bolt holes.

  Hereinafter, each of these parts will be described in detail.

  The baffle plate 10 is provided between the crankshaft 40 and the oil pan 50 as shown in FIG. As is well known, the crankshaft 40 rotates according to the reciprocating motion of a piston (not shown). The crankshaft 40 includes a journal 42 serving as a rotating shaft, a crankpin 46 connected to a connecting rod (not shown), and a counterweight 44 for balancing the whole. The journal 42 is rotatably supported by the bearing cap 70 and the cylinder block 60.

  On the other hand, the oil pan 50 stores lubricating oil supplied to each part in the engine and is a deep bottom container. The lubricating oil 52 stored in the oil pan 50 is pumped up by an oil pump (not shown) through a strainer, filtered and purified by an oil filter (not shown), and then supplied again to each part in the engine. Is done.

  The baffle plate 10 is fastened to the bottom surface of the bearing cap 70 so as to be between the crankshaft 40 and the oil pan 50. This will be described with reference to FIG.

  3 is a cross-sectional view taken along the line BB in FIG. 1 when the baffle plate 10 is fastened to the bearing cap 70.

  The bearing cap 70 supports the crankshaft 40 in cooperation with the cylinder block 60. A semicircular arc surface 76 for receiving the journal 42 of the crankshaft 40 is formed on the upper surface of the bearing cap 70. A brane bearing (not shown) is mounted on the semicircular arc surface 76, and the journal 42 is rotatably supported.

  The cylinder block 60 has a bearing portion 62 for supporting the crankshaft 40 in cooperation with the bearing cap 70 and a skirt portion 64 extending downward from the left and right ends thereof. A semicircular arc surface 66 for receiving the journal 42 is also formed on the lower surface of the bearing portion 62, and a brain bearing is mounted.

  The skirt portion 64 extends downward from the left and right ends of the bearing portion 62 and covers the entire engine. An oil pan 50 is fastened to the bottom surface of the skirt portion 64 with bolts.

  The bearing cap 70 and the cylinder block 60 are fastened by two types of four bolts 74 and 72. Both the first fastening bolt 74 and the second fastening bolt 72 extend from the bottom surface of the bearing cap 70 to the inside of the cylinder block 60 and fasten them. The second fastening bolt 72 has a female screw formed on the head.

  The baffle plate 10 has flange portions 14a and 14b protruding to the left and right. A fastening hole 24 into which a child bolt 80 can be inserted is formed at a predetermined position of the flange portions 14a and 14b. The child bolt 80 is a bolt that can be screwed into a female screw portion formed on the head of the second fastening bolt 72. The baffle plate 10 is fastened to the head of the second fastening bolt 72 by the child bolt 80. Thereby, the baffle plate 10 is fastened in a state relatively close to the crankshaft 40. Of course, the baffle plate 10 may be fastened to another position as long as it is disposed between the crankshaft 40 and the oil pan 50. Therefore, it may be fastened to the bottom of the cylinder block or the oil pan 50, for example.

  As is clear from FIGS. 1 and 2, the body portion 12 of the baffle plate 10 is formed with recesses 16 that are recessed from the periphery in rows. The recess 16 is provided along the rotation locus of the counterweight 44. In other words, the counter weight 44 is provided almost directly below the counterweight 44 so that the rotating counterweight 44 and the baffle plate 10 do not interfere with each other. Of course, as long as the baffle plate 10 is disposed at a lower position and interference with the counterweight 44 can be avoided, the concave portion need not be provided.

  The recess 16 is provided with oil dropping holes 18 and 20 for discharging the lubricating oil falling on the upper surface of the baffle plate 10 to the oil pan 50. In other words, the oil drain holes 18 and 20 are formed along the rotation locus of the counterweight 44 of the crankshaft 40. This is because the lubricating oil adhering to the counterweight 44 is efficiently discharged into the oil pan 50. That is, the oil dropping holes 18 and 20 are provided at positions where the lubricating oil adhering to the counterweight 44 is likely to be scattered by rotation and immediately below the rotation locus.

  The positions of the oil drain holes 18 and 20 will be described with reference to FIG. 4 is a cross-sectional view taken along the line CC in FIG. Note that an arc indicated by a two-dot chain line in FIG. 4 is a rotation locus S of the counterweight 44.

  The oil drain holes 18 and 20 provided on the baffle plate 10 are provided only on one side which is the downstream side of rotation of the counterweight 44 (left side in FIG. 4). This is because the influence of the rotating air generated with the rotation of the counterweight 44 is not given to the lubricating oil in the oil pan. This will be described.

  When the counterweight rotates, rotating winds W1 to W5 are generated in the tangential direction of the rotation locus S. The rotating winds W <b> 1 to W <b> 5 are normally blocked by the baffle plate 10 provided on the upper surface of the oil pan 50, and therefore do not flow into the oil pan 50. However, a part of the oil flows into the oil pan 50 through the oil drain holes 18 and 20 and the gap between the baffle plate 10 and the oil pan 50. When the rotating wind flowing into the oil pan 50 hits the stored lubricating oil surface, a wave is generated on the lubricating oil surface. Then, new bubbles are generated in the lubricating oil by the waves. For this reason, it is desirable that the rotating air does not flow into the oil pan 50, or even if it flows, no wave is generated on the lubricating oil surface.

  Therefore, in the present embodiment, the oil drain holes 18 and 20 are provided only on the downstream side of the rotation. As is apparent from FIG. 4, the rotary winds W4 and W5 flowing into the oil pan 50 from the oil spill holes 18 and 20 on the downstream side of the rotation are in a substantially horizontal direction or upward. Therefore, even if it flows into the oil pan 50, it does not strike the lubricating oil surface directly, or even if it strikes, the influence is small. Moreover, since the inflowing rotary winds W4 and W5 are separated from the generation position by the distance from the lubricating oil surface, their momentum is weakened when they reach the lubricating oil surface. Therefore, even if the lubricating oil surface is struck by the rotating winds W4 and W5, the undulations caused thereby are small. Therefore, it is difficult for new bubbles to be generated.

  Further, the lubricating oil adhering to the counterweight 44 is likely to be scattered downstream of the rotation due to the centrifugal force. Moreover, even if it is the lubricating oil which fell to the rotation upstream side and the rotation middle flow side, it is easy to be flowed to the rotation downstream side by the rotation wind W1-W5. That is, the lubricating oil that has dropped onto the upper surface of the baffle plate 10 tends to gather on the downstream side of the rotation. Therefore, by providing the oil dropping holes 18 and 20 on the downstream side of the rotation, the lubricating oil can be discharged into the oil pan 50 more efficiently. Therefore, the interference between the lubricating oil accumulated on the upper surface of the baffle plate 10 and the rotating counterweight 44 can be prevented. In other words, bubbles in the lubricating oil discharged to the oil pan 50 can be reduced, and consequently, bubbles in the stored lubricating oil can be reduced.

  The case where oil drain holes are provided on the upstream side and the midstream side will be briefly described. When the oil dropping hole is provided on the midstream of the rotation, the downward rotating wind W <b> 3 flows into the oil pan 50. The rotating wind W3 hits the lubricating oil surface with a strong momentum because the distance from the generation position to the lubricating oil surface is short. Therefore, a large wave is generated on the lubricating oil surface, and new bubbles are generated.

  Further, when an oil drain hole is provided on the upstream side of the rotation, the downward rotating wind W <b> 2 flows into the oil pan 50. Since this rotating wind W2 has a long distance from the generation position to the lubricating oil surface, its momentum is weakened when it reaches the lubricating oil surface. Therefore, the wave generated by the rotating wind is smaller than when oil dropping holes are provided on the midstream of the rotation. However, since the direction of the rotating air W2 is downward, when it flows into the oil pan 50, the lubricating oil surface is hit and a wave is generated on the lubricating oil surface. Therefore, it is desirable not to provide an oil drain hole on the upstream side of the rotation.

  As is clear from the above description, by providing the oil dropping hole only on the downstream side of the rotation, the lubricating oil can be efficiently discharged while preventing the lubricating oil surface from being rippled. Therefore, bubbles in the lubricating oil stored in the oil pan can be reduced.

  In the present embodiment, a plurality of oil drain holes 18 and 20 are provided on the downstream side of the rotation. That is, it has the 1st oil spill hole 18 in the rotation downstream side, and the 2nd oil spill hole 20 nearer to the midstream of rotation than this. The first oil drain hole 18 is larger than the second oil drain hole. This is because the more the downstream side of the rotation, the more the rotating wind is directed upwards and the lubricating oil surface is harder to hit, and the distance from the rotating wind generation position to the lubricating oil surface is longer and the momentum when reaching the lubricating oil surface is increased. Because it becomes weak. In other words, the closer to the downstream side of the rotation, the smaller the influence of the rotating wind on the lubricating oil surface. That is, the smaller the position where the influence of the rotating wind flowing into the oil pan 50 on the lubricating oil surface is, the larger the hole is, and a larger amount of lubricating oil is discharged. On the other hand, where the influence of the rotating wind is large, the ripples of the lubricating oil are prevented by not providing small holes or holes. Therefore, it is possible to efficiently discharge the lubricating oil on the baffle plate 10 to the oil pan 50 while preventing the generation of bubbles in the lubricating oil stored in the oil pan 50.

  By efficiently discharging the lubricating oil, it is possible to prevent a large amount of lubricating oil from accumulating on the baffle plate 10 and to prevent interference between the counterweight 44 and the lubricating oil on the baffle plate 10. As a result, bubbles in the lubricating oil 52 stored in the oil pan 50 can be reduced.

  In the present embodiment, two oil spill holes 18 and 20 are provided in one recess 16, but a larger or smaller number may be used. Moreover, although it is set as a large hole, so that it is near an edge part, you may have the relationship of other magnitude | sizes, such as all the same magnitude | sizes.

  The flange portions 14a and 14b provided at both ends of the baffle plate 10 are bent halfway to form a falling wall 30 and a rising wall 32. The falling wall 30 is formed by bending the flange portion 14a on the downstream side of the rotation downward in the middle thereof. In this way, by bending downward, the lubricating oil on the baffle plate that has flowed to the rotating downstream end is not blocked and discharged into the oil pan 50. In addition, the strength of the entire baffle plate can be increased by bending the end portion.

  The rising wall 32 is formed by bending the flange portion 14b on the upstream side of the rotation upward in the middle thereof. Thus, by bending upward, it is possible to prevent the downward rotating wind W1 from flowing into the oil pan 50 through the gap between the baffle plate 10 and the oil pan 50. That is, the rotating wind W <b> 1 is blocked by the rising wall 32 and cannot flow into the oil pan 50. That is, by providing the rising wall 32, it is possible to prevent the lubricating oil surface from wavy and reduce bubbles in the lubricating oil stored in the oil pan 50.

  Note that the rising wall 32 and the falling wall 30 do not have to be vertical, and may have an inclination. Moreover, it is not necessary to have both the rising wall 32 and the falling wall 30, and you may have only one or neither.

  As described above, according to the present embodiment, bubbles in the lubricating oil can be reduced. Note that the shape and position of the baffle plate can be appropriately changed. For example, the baffle plate may have a rectangular cross section instead of an arc cross section.

  Next, another embodiment will be described with reference to FIG. FIG. 5 is a top view of a baffle plate 10 according to another embodiment. The baffle plate 10 has oil drain holes 18, 20, 92, 94 on both sides of the downstream side and the upstream side. Among these, the first oil dropping hole 18 located on the most downstream side of the rotation is the largest hole. On the contrary, the smallest is the third oil drain hole 92 on the upstream side of the rotation which is relatively close to the midstream side of the rotation. The remaining second oil drain hole 20 and the fourth oil drain hole 94 located on the most upstream side are substantially the same size, or the second oil drain hole 20 is slightly larger. That is, the total area of the oil drain holes 18 and 20 provided on the rotation downstream side is larger than the total area of the oil drain holes 92 and 94 provided on the rotation upstream side. In other words, the oil dropping hole closer to the end portion is a larger hole.

  The reason for this size is as follows. As described above, the rotating wind W2 on the upstream side of the rotation is downward, and when it flows into the oil pan, it is directed to strike the lubricating oil surface. On the other hand, the rotating winds W4 and W5 on the downstream side of the rotation are substantially horizontal or upward, and do not hit the lubricating oil surface even when flowing into the oil pan, or are difficult to hit. That is, the rotating wind on the downstream side of the rotation is less likely to generate a wave on the lubricating oil surface. Therefore, by making the total area of the oil drain hole on the upstream side of the rotation smaller than the total area of the oil drain hole on the downstream side of the rotation, the influence of the rotating wind flowing from the oil drain hole is reduced. As a result, the ripples of the lubricating oil are reduced, and as a result, the generation of bubbles is reduced.

  Further, the closer to the end, the greater the distance from the rotating wind generation position to the lubricating oil surface. Therefore, the closer to the end, the weaker the momentum of the rotating air reaching the lubricating oil surface. For this reason, in the present embodiment, the oil dropping hole closer to the end portion is made larger, and the ripple of the lubricating oil surface is reduced while efficiently discharging the lubricating oil to the oil pan. Thereby, bubbles are reduced.

  As described above, according to the present embodiment, it is possible to reduce the generation of bubbles in the lubricating oil.

It is a top view of the baffle plate which is embodiment of this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is CC sectional drawing in FIG. It is a top view of the baffle plate which is other embodiment.

Explanation of symbols

  10 Baffle plate, 12 Body part, 14a, 14b Flange part, 16 Recessed part, 18, 20, 92, 94 Oil drain hole, 40 Crankshaft, 44 Counterweight, 50 Oil pan, 52 Lubricating oil, S Rotating locus, W1, W2, W3, W4, W5 Rotating wind.

Claims (4)

  A vehicle engine baffle plate provided between a crankshaft provided in a vehicle engine and an oil pan for storing lubricating oil supplied to each part in the vehicle engine,
  The baffle plate has a plurality of oil drain holes for discharging the lubricating oil dropped on the upper surface thereof to the oil pan,
  A baffle plate for a vehicle engine, wherein the oil drain hole is larger as it is closer to both ends as viewed in the direction of the rotation axis of the crankshaft.   The vehicle engine baffle plate according to claim 1,
  The baffle plate has a flange portion at the upstream end of the rotation,
  The baffle plate for a vehicular engine, wherein the flange portion at the end portion on the upstream side of the rotation is bent upward in the middle thereof.   A baffle plate for a vehicle engine according to claim 1 or 2,
  The baffle plate has a flange at the downstream end of the rotation,
  A baffle plate for a vehicular engine, wherein the flange portion at the end portion on the downstream side of the rotation is bent downward in the middle thereof.   A baffle plate for a vehicle engine according to any one of claims 1 to 3,
  Centering on a perpendicular passing through the rotation center point of the crankshaft, the total area of the oil drain hole provided on one side which is the downstream side of the rotation of the crankshaft is the sum of the oil drain hole provided on one side which is the upstream side of the rotation. A baffle plate for a vehicle engine characterized by being larger than the total area.

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