JP2010151011A - Baffle plate of engine for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a baffle plate of an engine for a vehicle, suitable for suppressing a pumping loss. <P>SOLUTION: The baffle plate 4 of an engine for a vehicle is disposed between a crankshaft 3 and an oil pan 5 storing lubricating oil which are disposed in the engine for the vehicle. The baffle plate 4 is formed of: a bottom plate 10; side walls 11 erected from lateral sides on both sides of the bottom plate 10 along the crankshaft 3; and flange parts 13 extended from upper ends of the side walls 11 to the both sides. Oil drop holes 14 as openings for communicating an upper space with a lower space of the baffle plate 4 are formed on each of the side walls 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a baffle plate for a vehicle engine disposed between an oil pan for storing lubricating oil for the vehicle engine and a crankshaft.

  Since air bubbles (air) are not mixed into the lubricating oil stored in the oil pan, 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. A baffle plate that reduces bubbles in the lubricating oil discharged to the oil pan by preventing a collision between the crankshaft and the lubricating oil is proposed.

This is because the oil dropped on the upper surface of the baffle plate provided between the crankshaft provided in the vehicle engine and the oil pan for storing the lubricant supplied to each part in the vehicle engine is oil pan. In the case of providing an oil drain hole for discharging the oil, the oil drain hole is provided only on one side which is on the downstream side of the perpendicular line passing through the rotation center point of the crankshaft.
JP 2005-127146 A

  However, in the above conventional example, since the oil drop hole provided in the baffle plate is provided only on one side, the flow of atmospheric gas between the crankcase and the oil pan with the baffle plate as a boundary deteriorates, and the inside of the crankcase The internal pressure of the cylinder increases and acts on the back surface of the reciprocating piston, which may cause a pump loss.

  Then, this invention is made | formed in view of the said problem, and it aims at providing the baffle plate of the vehicle engine suitable for pump loss suppression.

  According to the present invention, a baffle plate is formed by a bottom plate, side walls erected from both sides along the crankshaft of the bottom plate, and flanges projecting from the upper end of each side wall to both sides, and the baffle plate is formed on each side wall. An opening hole was formed to allow communication between the upper space and the lower space.

  Therefore, in the present invention, a baffle plate is formed by the bottom plate, the side walls erected from both sides along the crankshaft of the bottom plate, and the flanges projecting to the both sides from the upper end of each side wall. Since the opening hole that connects the upper space and the lower space of the baffle plate is formed, the lubricating oil riding on the baffle plate can be efficiently discharged to the oil pan, and the upper space and the lower space of the baffle plate in the crankcase The gas flow between the two can be made smooth, and the back pump loss of the piston can be reduced.

  Hereinafter, the baffle plate of the engine for vehicles of the present invention is explained based on each embodiment.

(First embodiment)
1 to 4 show a first embodiment of a baffle plate of a vehicle engine to which the present invention is applied. FIG. 1 is a sectional view of an engine including a baffle plate, FIG. 2 is a bottom view of a ladder frame, and FIG. FIG. 4 is a sectional view showing a modification of the baffle plate.

  As shown in FIGS. 1 and 2, a V-type 6-cylinder vehicle engine is attached to a bottom portion of a cylinder block 1 with a ladder frame 2 that is partitioned into three storage chambers in the axial direction with a crankshaft 3 interposed therebetween. It has been. A baffle plate 4 is attached to the bottom of the ladder frame 2, and an oil pan 5 is attached to cover the baffle plate 4 from below. The oil pan 5 stores lubricating oil supplied to each part in the engine, and is a deep bottom container. The lubricating oil stored in the oil pan 5 is pumped up by an oil pump (not shown) through a strainer (not shown), filtered and purified by an oil filter (not shown), and then again in the engine. Are supplied to each part of

  As shown in FIG. 2, the ladder frame 2 includes four bearing cap portions 2A arranged at intervals in the axial direction for supporting each journal portion of the crankshaft 3 from below, and these bearing caps. The connecting portion 2B that connects both ends of the portion 2A is integrally formed by die casting with an aluminum alloy or the like. Each of the bearing cap portions 2A coincides with a bearing portion formed at the bottom of the bulkhead of the cylinder block 1, and supports each journal portion of the crankshaft 3 with a bearing metal interposed therebetween. The connecting portion 2B is joined to the skirt portion 1A of the cylinder block 1 from below. The three storage chambers are formed in the axial direction of the crankshaft 3 by the bearing cap portion 2A and the connecting portion 2B, respectively.

  Each bulkhead of the cylinder block 1 and each bearing cap portion 2A of the ladder frame 2 are formed with an oil draining passage 6 for lubricating oil that penetrates the bulkhead and connects the upper end of the cylinder block 1 and the lower end of the ladder frame 2. Thus, the lubricating oil supplied to the valve cam mechanism on the cylinder head (not shown) functions to return to the oil pan 5.

  The baffle plate 4 is formed by press-molding a relatively thin metal plate, and is provided between the crankshaft 3 and the oil pan 5. The baffle plate 4 includes a main body portion 12 having a U-shaped cross section including a bottom plate 10 and both side walls 11 erected from both end portions along the axial direction of the crankshaft 3 of the bottom plate 10, and both side walls of the main body portion 12. 11 and a flange portion 13 projecting on both sides from the upper end. The baffle plate 4 has an inverted hat-shaped cross section as a whole.

  As shown in FIG. 1, the main body 12 is disposed so as to protrude from the flange 13 toward the oil pan 5 so as not to interfere with the outer edge of the rotation locus of the counterweight 3 </ b> A of the crankshaft 3. The connecting portion with the portion 13 is positioned so as to be closest to the outer edge of the rotation trajectory of the counterweight 3A of the crankshaft 3, but is disposed at a portion separated by a preset dimension so as not to interfere with the counterweight 3A. ing.

  Oil drain holes 14 are provided in both side walls 11 of the main body 12. In the drawing, the oil drain hole 14 is close to the position where the upper end contacts the flange portion 13 (see FIG. 4) or the connecting portion with the flange portion 13 in the side wall 11 located on the upstream side of the crankshaft 3. An opening is provided in the side wall 11 at the upper position. On the upstream side wall 11, the air flow generated with the rotation of the crankshaft 3 is lowered while leaving the side wall 11, that is, acts to scrape. In addition, the side wall 11 located on the downstream side of the rotation of the crankshaft 3 is disposed so as to open to the side wall 11 at a position where the lower end is in contact with the bottom plate 10 or a lower position in FIG. ing. In the downstream side wall 11, the airflow generated with the rotation of the crankshaft 3 rises while approaching the side wall 11, that is, acts to scoop up.

  The flange portion 13 is fixed to the connecting portion of the ladder frame 2 by fastening bolts. The outer edge of the flange portion 13 is disposed inside the opening of each oil drain passage 6 so as not to block each oil drain passage 6 that opens below the bearing cap portion 2A in the ladder frame 2. For this reason, the lubricating oil flowing out from the oil dropping passage 6 and dropping is directly dropped onto the oil pan 5 without contacting the baffle plate 4. The baffle plate 4 may be fastened to another position, for example, the oil pan 5 as long as it is disposed between the crankshaft 3 and the oil pan 5.

  In the baffle plate 4 of the vehicle engine having the above configuration, since the cross section is formed in an inverted hat shape, the bending rigidity can be improved, and even if the oil drain hole 14 is formed in the main body portion 12, The strength reduction can be made relatively small, and vibration and noise during engine operation can be suppressed.

  Further, in the baffle plate 4 of the vehicular engine having the above-described configuration, the flange portions 13 which are both ends thereof are disposed on the inner side avoiding the opening of the oil drain passage 6 of the ladder frame 2. The lubricant oil that flows downward does not flow onto the baffle plate 4 and is quickly collected in the oil pan 5.

  Further, when the crankshaft 3 rotates, rotating winds W1 to W5 are generated in the tangential direction from the outer peripheral edge of the rotation locus of the counterweight 3A. The rotating winds W <b> 1 to W <b> 5 are normally blocked by the baffle plate 4 provided on the upper surface of the oil pan 5, and therefore do not flow into the oil pan 5. However, a part of the oil flows into the oil pan 5 through the oil drain hole 14 and the gap between the outer periphery of the baffle plate 4 and the ladder frame 2. When the rotating wind flowing into the oil pan 5 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 not to allow the rotating air to flow into the oil pan 5 or to generate a wave on the lubricating oil surface even if it flows.

  In the present embodiment, the oil drain hole 14 is provided only on the side wall 11 of the main body 12. Since the oil spilling hole 14 on the upstream side of the rotation is open to the back with respect to the direction of the rotating air, the rotating air is prevented from flowing into the oil pan 5 from the oil spilling hole 14. Moreover, since the oil spill hole 14 is opened at the top of the side wall 11, even if the rotating air hits the bottom surface and bounces, the rotating air flows into the oil pan 5 from the oil spill hole 14. Further suppression can be achieved.

  Further, the rotating wind W4 flowing into the oil pan 5 from the oil drain hole 14 on the downstream side of the rotation is in a substantially horizontal direction. Therefore, even if it flows into the oil pan 5, it does not directly hit the surface of the lubricating oil, or even if it hits, the influence is small. In addition, since the inflowing rotary wind W4 is far from the position where it is generated to the lubricating oil surface, the momentum of the rotating wind W4 decreases when it reaches the lubricating oil surface. Therefore, even if the lubricating oil surface is struck by the rotating air W4, the undulations caused thereby are small. Therefore, it is difficult for new bubbles to be generated. In addition, since the oil drain hole 14 is arranged to open to the lower part of the side wall 11, even if the rotating air hits the bottom surface and bounces off, the rotating air from the oil drain hole 14 is changed slightly upward. Even if the oil flows into the oil pan 5, the lubricating oil surface is not directly struck and the influence is small.

  Further, the oil drain hole 14 provided on the upstream side of the rotation is opened on the back surface with respect to the direction of the rotating air as described above. For this reason, the lubricating oil adhering to the counterweight 3 </ b> A rarely passes through the oil dropping hole 14 and is discharged into the oil pan 5. That is, the lubricating oil adhering to the counterweight 3A 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 dropped on the upper surface of the baffle plate 4 tends to gather on the downstream side of the rotation. Accordingly, the lubricating oil can be efficiently discharged into the oil pan 5 by the oil dropping hole 14 provided on the downstream side of the rotation. Therefore, the interference between the lubricating oil accumulated on the upper surface of the baffle plate 4 and the rotating counterweight 3A can be prevented. In other words, bubbles in the lubricating oil discharged to the oil pan 5 can be reduced, and consequently bubbles in the stored lubricating oil can be reduced.

  In this embodiment, even if the oil drain hole 14 provided on the downstream side of the rotation is blocked by the passage of the lubricating oil, the oil drain hole 14 provided on the upstream side of the rotation is Therefore, as described above, the baffle is not blocked by the passage of the lubricating oil and the air flow between the oil pan 5 and the upper surface of the baffle plate 4 is relatively smoothly performed. The atmosphere gas flow between the crankcase and the oil pan 5 between the plate 4 and the oil pan 5 can be made good, and the increase of the internal pressure in the crankcase is suppressed, and the increase of the internal pressure acts on the back surface of the piston that reciprocates. There is no risk of pump loss.

  In the present embodiment, the following effects can be achieved.

  (A) A baffle plate 4 for a vehicle engine provided between a crankshaft 3 provided in the vehicle engine and an oil pan 5 for storing lubricating oil. The baffle plate 4 includes a bottom plate 10 and a bottom plate. 10 are formed by side walls 11 erected from both sides along the crankshaft 3, and flange portions 13 projecting on both sides from the upper end of each side wall 11. In each side wall 11, an upper space of the baffle plate 4 is formed. Since the oil drain hole 14 is formed as an opening hole that communicates with the lower space, the lubricating oil on the baffle plate 4 can be efficiently discharged to the oil pan 5 and the baffle plate in the crankcase The flow of the gas between the upper space 4 and the lower space 4 can be made smooth, and the back pump loss of the piston can be reduced. Further, since the baffle plate 4 is configured by connecting the bottom plate 10 and the flange portion 13 with the side wall 11, the rigidity of the baffle plate 4 can be improved and noise vibration can be suppressed.

  (A) The oil drain hole 14 as an opening hole provided in the side wall 11 is opened at a position close to the flange portion 13 in the side wall 11 on the upstream side of the perpendicular passing through the rotation center point of the crankshaft 3. Since the side wall 11 which is on the downstream side of the vertical line passing through the rotation center point of the crankshaft 3 is opened at a position close to the bottom plate 10, the function of discharging the lubricating oil on the baffle plate 4 to the oil pan 5 is provided. And the function of promoting the gas flow between the upper space and the lower space of the baffle plate 4 in the crankcase can be efficiently achieved.

(Second Embodiment)
5 to 7 show a second embodiment of a baffle plate of a vehicle engine to which the present invention is applied, FIG. 5 is a sectional view of the engine including the baffle plate, FIG. 6 is a longitudinal sectional view of the baffle plate, FIG. FIG. 3 is a perspective view of a baffle plate. In the present embodiment, a configuration for efficiently discharging the lubricating oil scattered on the baffle plate to the oil pan 5 is added to the first embodiment. The same devices as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  5-7, the baffle plate 4 of the vehicle engine of this embodiment forms a plurality of depressions 15 opened upward on the bottom plate 10 of the main body 12 of the baffle plate 4 of the first embodiment. The lubricating oil splashed on the baffle plate 4 is guided into the recess 15 so that the lubricating oil can be discharged toward the oil pan 5 through the oil dropping hole 17 formed in the vertical wall 16 forming the recess 15. It is.

  The bottom plate 10 of the baffle plate 4 protrudes from the bottom plate 10 toward the oil pan 5 by press molding, and a plurality of grooves extending in the width direction are formed. These grooves have a shape in which the vertical walls 16 on the front, rear, left and right sides of the groove 12 protrude toward the oil pan 5 from the bottom plate 10 of the main body 12, and the bottom plate of the groove is connected to the tip (oil pan 5) side of the vertical wall 16. . Then, as shown in FIGS. 6 and 7, oil drain holes 17 are respectively formed in the vertical walls 16 of the recesses 15. The oil drain hole 17 is formed by a long hole in the vertical wall 16 disposed on both sides of the recess 15 in the groove disposed in the deep region of the oil pan 5. Further, in the recess 15 provided in the region where the depth of the oil pan 5 is shallow, the recess 15 is provided only on the vertical wall 16 facing the deep side of the oil pan 5 and the region where the depth of the oil pan 5 is deep. The oil drain hole 17 provided in a shallow region compared to the above is made smaller by a plurality of round holes or the like. Other configurations are the same as those in the first embodiment.

  In the baffle plate 4 of the present embodiment, a plurality of recesses 15 are formed in the bottom plate 10 of the main body portion 12 by a plurality of grooves, so that the lubricating oil splashed on the baffle plate 4 from the counterweight 3A of the crankshaft 3 Can be quickly introduced into the recess 15 that is spaced downward from the counterweight 3 </ b> A, and the lubricating oil introduced into the recess 15 passes through an oil dropping hole 17 provided in the vertical wall 16 constituting the recess 15. The oil pan 5 can be quickly discharged. For this reason, it can suppress that the lubricating oil splashed on the baffle plate 4 is wound up by the rotation wind accompanying rotation of the crankshaft 3.

  Further, oil spill holes 17 are arranged on both sides of the vertical wall 16 on the deep side of the oil pan 5 and the opening area is large, and the oil spill holes 17 on the shallow side of the oil pan 5 face the deep side of the oil pan 5. It arrange | positions at the vertical wall 16 and it is comprised so that the opening area may become small as the oil pan 5 depth moves from a deep side to a shallow side. For this reason, in the deep region of the oil pan 5 where the lubricating oil is directly discharged to the liquid surface of the lubricating oil, the opening area of the oil dropping hole 17 can be set large to improve the lubricating oil discharging function. Further, on the shallow side of the oil pan 5 where it is estimated that the lubricating oil discharged to the oil pan 5 from the oil dropping hole 17 and dropped and collides with the bottom surface of the oil pan 5, the opening area of the oil dropping hole 17 is assumed. Is set small, and the oil drain hole 17 is opened toward the deep side of the oil pan 5, so that the discharged lubricating oil flows from the shallow side to the deep side of the oil pan 5. (Refer to the arrow in the figure) Since the oil is discharged in the forward direction (the same direction) with respect to the lubricating oil, the rebound can be suppressed. Therefore, it is possible to effectively suppress the bubbles from being mixed into the lubricating oil stored in the oil pan 5.

  In the present embodiment, in addition to the effects (a) to (b) in the first embodiment, the following effects can be achieved.

  (C) The bottom plate 10 includes a recess 15 formed by a plurality of grooves that project the bottom plate 10 toward the oil pan 5 and extend in the width direction of the bottom plate 10, and serves as an oil dropping hole 17 in the vertical wall 16 of the recess 15. Since the functioning opening hole is formed, the lubricating oil on the baffle plate 4 can be quickly introduced into the recess 15 separated downward from the counterweight 3A, and the lubricating oil in the recess 15 is provided in the vertical wall 16 and dropped. The oil can be quickly discharged to the oil pan 5 through the hole 17. For this reason, it can suppress that the lubricating oil on the baffle plate 4 is wound up by the rotation wind accompanying rotation of a crankshaft.

  (D) The opening hole formed as the oil dropping hole 17 in the vertical wall 16 of the recess 15 is formed in the vertical wall 16 on both sides in the longitudinal direction of the recess 15 in the recess 15 provided in the region where the depth of the oil pan 5 is deep. In the recess 15 provided in the region where the depth of the oil pan 5 is shallow, the oil pan 5 is formed on the vertical wall 16 on one side in the longitudinal direction of the recess 15 facing the deep side of the oil pan 5, so the discharged lubricating oil is Since the bottom of the oil pan 5 is discharged in the forward direction (same direction) with respect to the lubricating oil flowing from the shallow side to the deep side, the rebound can be suppressed. Therefore, it is possible to effectively suppress the bubbles from being mixed into the lubricating oil stored in the oil pan 5.

  (E) The opening hole formed as the oil dropping hole 17 in the vertical wall 16 of the recess 15 is large in the recess 15 provided in the region where the depth of the oil pan 5 is deep, and the recess provided in the region where the depth of the oil pan 5 is shallow. 15 is formed to be small, it is possible to achieve both the effect of discharging the lubricating oil and the effect (d).

The sectional view of the engine containing the baffle plate of the engine for vehicles which shows one embodiment of the present invention. The bottom view of a ladder frame. Explanatory drawing which shows the action | operation of a baffle plate. Sectional drawing which shows the modification of a baffle plate. Sectional drawing of the engine containing the baffle plate of the engine for vehicles which shows 2nd Embodiment of this invention. The longitudinal cross-sectional view of a baffle plate. The perspective view of a baffle plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Ladder frame 3 Crankshaft 4 Baffle plate 5 Oil pan 6 Oil drop passage 10 Bottom plate 11 Side wall 12 Body part 13 Flange part 14, 17 Oil drop hole 15 Depression 16 Vertical wall

Claims (5)

A baffle plate for a vehicle engine provided between a crankshaft provided in the vehicle engine and an oil pan for storing lubricating oil,
The baffle plate is formed of a bottom plate, side walls erected from both sides along the crank shaft of the bottom plate, and flanges projecting from the upper end of each side wall to both sides,
A baffle plate for a vehicular engine, wherein each side wall is formed with an opening for communicating an upper space and a lower space of the baffle plate.   The opening hole is opened at a position close to the flange on the side wall on the upstream side of the vertical line passing through the rotation center point of the crankshaft, and on the downstream side of the vertical line passing through the rotation center point of the crankshaft. 2. The vehicle engine baffle plate according to claim 1, wherein the side wall is opened at a position close to the bottom plate. The bottom plate includes a recess formed by a plurality of grooves that project the bottom plate toward the oil pan and extend in the width direction of the bottom plate,
The baffle plate for a vehicle engine according to claim 1 or 2, wherein an opening hole functioning as an oil drain hole is formed in a vertical wall of the depression.   The opening hole formed as the oil drain hole in the vertical wall of the recess is formed in the vertical wall on both sides in the longitudinal direction of the recess in the recess provided in the region where the depth of the oil pan is deep, and in the region where the depth of the oil pan is shallow. 4. The vehicle engine baffle plate according to claim 3, wherein the recess provided is formed on a longitudinal wall on one side in the longitudinal direction of the recess facing the deep side of the oil pan.   The opening hole formed as the oil drain hole in the vertical wall of the recess is large in the recess provided in the region where the depth of the oil pan is deep, and small in the recess provided in the region where the depth of the oil pan is shallow. The baffle plate for a vehicle engine according to claim 3 or 4, characterized by the above.

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