JP2009091989A - Baffle plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce pumping loss by smoothing flow of air between cylinders in a multiple cylinder internal combustion engine and inhibit violent movement of oil in an oil pan. <P>SOLUTION: A baffle plate 10 is provided at an upper part of an oil pan 14 of the multiple cylinder internal combustion engine 12. The baffle plate 10 includes communication concave parts 40a-40d bent in a convex shape toward a lower part at an axial direction part of the cylinder 22 which goes over the adjacent cylinder 22 in a plurality of cylinders 22 arranged in series. A communication hole 42 establishing communication between the inside of a crank chamber 18 and the inside of the oil pan 14 is provided at each bottom part of the communication concave parts 40a-40d. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a baffle plate provided on an upper part of an oil pan in a multi-cylinder internal combustion engine.

  An oil pan for storing oil is provided below the crank of the internal combustion engine. In the crank chamber, the piston repeatedly moves up and down at a high speed, and air flows between the cylinders at a considerably high speed.

  For this reason, in the crank chamber structure described in Patent Document 1, a baffle plate is provided between the cylinder block and the oil pan, and a peripheral portion is held, and the influence of the air flow by the piston on the oil in the oil pan. We are trying to reduce it.

Japanese Utility Model Publication No. 57-109251

  In the crank chamber structure described in Patent Document 1, a baffle plate is provided in a part of the crank chamber space, and a communication hole is provided immediately below each cylinder. The communication hole has an elongated shape in a direction perpendicular to the axis of the crankshaft. The peripheral edge of the communication hole is bent slightly upward, and the oil in the crank chamber is temporarily stored on the baffle plate and then returned to the oil pan through the communication hole.

  In such a configuration, the air pushed down by the piston is directly removed from the communication hole and guided to the space below the baffle plate. Cylinders having different piston phases communicate with each other through the communication hole and the lower space, and can be ventilated. However, since air passes through the space below the baffle plate, there is a possibility that oil level fluctuation may occur. If the communication hole of the baffle plate is too large, the original effect of the baffle plate cannot be obtained. Further, the oil falling from the crank chamber is unnecessarily stored on the baffle plate.

  The present invention has been made in consideration of such problems, and in a multi-cylinder internal combustion engine, the air flow between the cylinders is smoothed to reduce pumping loss and to suppress the oil rampage in the oil pan. It is an object to provide a baffle plate that can be used.

  The present invention is a baffle plate provided between a crank chamber and an oil pan in a multi-cylinder internal combustion engine, and has the following characteristics.

  (1) Among the plurality of cylinders arranged in series, a communicating concave portion that curves in a concave shape toward the crank chamber side is provided in an axial direction portion of the cylinder between adjacent cylinders. To do.

  By providing such a communication recess, the air flow between the cylinders can be made smooth in a multi-cylinder internal combustion engine to reduce the pumping loss, and the oil ramp in the oil pan can be suppressed.

  (2) The bottom of the communication recess is provided with a communication hole that communicates the crank chamber and the oil pan.

  According to such a communication hole, oil falling from above can be quickly returned into the oil pan from the communication recess, and the communication recess does not impair the function as the air passage.

  (3) The internal combustion engine has a plurality of cylinder rows, and the communication recesses are formed in parallel corresponding to the cylinder rows, and grooves that connect between the two communication recesses arranged in parallel are provided. It is characterized by.

  Such a groove acts as an oil passage between the communication recesses, and can return the oil into the oil pan more reliably and quickly. Further, the groove acts as a rib, so that the rigidity of the baffle plate can be increased and vibration can be reduced.

  (4) The communication recess is provided with at least two or more, and a boss for fixing to the oil pan is formed at least at one position between the adjacent communication recesses.

  Rigidity can be improved by forming ribs between the adjacent communication recesses and disposing the bosses close to the ribs. Furthermore, if the rib is provided so as to connect the two bosses, the rigidity can be further improved.

  (5) The axial direction portion of each cylinder is characterized in that a crank chamber and an oil pan are blocked by the baffle plate.

  As a result, most of the air pushed down by the piston hits the baffle plate, and can be prevented from coming off directly into the space below the baffle plate.

  (6) The communication hole is parallel to the axis of the crankshaft and has a shape in which the length in the axial direction is longer than the width in the orthogonal direction. Thereby, the flow of air becomes smooth and the oil easily returns into the oil pan.

  According to the baffle plate according to the present invention, among the plurality of cylinders arranged in series, the communication that curves in a convex shape toward the oil pan in the axial direction portion of the cylinder between adjacent cylinders. By having the recess, it is possible to reduce the pumping loss by smoothing the air flow between the cylinders in the multi-cylinder internal combustion engine, and to suppress the oil rampage in the oil pan.

  Embodiments of the baffle plate according to the present invention will be described below with reference to FIGS.

  As shown in FIGS. 1 and 2, the baffle plate 10 according to the present embodiment is provided in an internal combustion engine 12. The internal combustion engine 12 includes a cylinder head 13a, a cylinder block 13b, a lower block 13c, and an oil pan 14. In the following description, in the internal combustion engine 12, the direction of the cylinder head 13a (upper side in FIG. 1) is the upper side, and the direction of the oil pan 14 (lower side in FIG. 2) is the lower side.

  The baffle plate 10 is provided in the upper part of the oil pan 14 and in the lower part of the lower block 13c, and substantially shuts off the oil pan 14 and the crank chamber 18 from each other. The baffle plate 10 is composed of, for example, a cast iron plate. Oil 20 is stored in the oil pan 14, and the oil 20 is supplied to each part of the internal combustion engine 12 through a strainer and a pump (not shown).

  The internal combustion engine 12 is a V-type six cylinder, and two cylinder rows 24a and cylinder rows 24b each including three cylinders 22a, 22b, and 22c (hereinafter also referred to as cylinders 22) are provided in parallel. . In FIG. 1, the left side is a cylinder row 24a and the right side is a cylinder row 24b. The pistons 26 of each cylinder rotate at different phases so as to cancel vibrations. The piston 26 is connected to the crankshaft 30 via a connecting rod 28. The crankshaft 30 is provided with a counterweight (including a crank web) 32 for balancing with each piston 26. The baffle plate 10 has a substantially arc shape that protrudes downward in a side view (see FIG. 1) so as not to interfere with the counterweight 32.

  In each cylinder chamber 34, the piston 26 moves up and down, sucks air from the crank chamber 18 as the piston 26 moves up, and sends air to the crank chamber 18 as the piston 26 moves down. The pistons 26 and the cylinder chambers 34 in the two cylinder rows 24 a and 24 b are slightly offset in the axial direction of the crankshaft 30 because of the arrangement of connecting the connecting rods 28 to the crankshaft 30.

  As shown in FIGS. 3 and 4, the baffle plate 10 has four communication recesses 40 a, 40 b, 40 c, and 40 d (hereinafter also referred to as communication recesses 40) and bottoms of the communication recesses 40 a to 40 d. It has the communicating hole 42 provided and six boss portions 44a, 44b, 44c, 44d, 44e and 44f provided in the periphery. The four communication recesses 40a, 40b, 40c, and 40d are curved in a concave shape toward the crank chamber 18 side.

  The communication recess 40a is provided in an axial (see C of FIG. 1) direction portion between adjacent cylinders 22a and 22b in the cylinder row 24a, and the communication recess 40b is formed between the adjacent cylinders 22b and 22c in the cylinder row 24a. Is provided in the axial direction portion extending between the two. The communication recess 40c is provided in an axial direction portion between adjacent cylinders 22a and 22b in the cylinder row 24b, and the communication recess 40d is an axial portion between adjacent cylinders 22b and 22c in the cylinder row 24b. Is provided.

  The communication recess 40a and the communication recess 40c are slightly offset in the axial direction of the crankshaft according to the position of the corresponding piston 26. Similarly, the communication recess 40b and the communication recess 40d are arranged slightly offset in the axial direction of the crankshaft according to the position of the corresponding piston 26.

  A lateral rib 47a is formed between the communication recess 40a and the communication recess 40b adjacent in the axial direction of the crankshaft, and a horizontal rib 47b is formed between the communication recess 40b and the communication recess 40d. Straight vertical ribs 47c are formed between the communication recess 40a and the communication recess 40c and between the communication recess 40b and the communication recess 40d. The baffle plate 10 has high rigidity due to the horizontal ribs 47a and 47b and the vertical ribs 47c.

  The boss portion 44e is on and substantially adjacent to the extended line of the lateral rib 47a, and is substantially disposed on the lateral rib 47a, and has high rigidity. Similarly, the boss part 44b is substantially on the extension line of the lateral rib 47b and is close to the boss part 44b. The boss part 44b is substantially disposed on the lateral rib 47b and has high rigidity. Further, the lateral rib 47a and the lateral rib 47b are provided so as to substantially connect the two boss portions 44e and the boss portions 44b, and have high rigidity.

  Since the internal combustion engine 12 is V-shaped and each cylinder 22 is directed obliquely upward, the axial direction portion of each cylinder between the cylinder 22a and the cylinder 22b is the cylinder 22a and the cylinder 22b. Between the lower openings 50 of the respective cylinder chambers 34, at least the thickness portion of the partition wall 52 between the cylinders 22 a and 22 b is the axial direction portion of each cylinder (see C in FIG. 1).

  The communication recesses 40a to 40d are smoothly curved in a convex shape toward the bottom, and do not have a planar portion, protrusions, or depressions. The communication recesses 40a to 40d are steeply inclined at the periphery, and become gradually inclined toward the center, and the center (the portion where the communication hole 42 exists and its periphery) is a substantially horizontal surface.

  The communication hole 42 is a hole that communicates the inside of the crank chamber 18 and the oil pan 14, and is an elongated elliptical slit parallel to the axis of the crankshaft 30. That is, the axial length is longer than the width in the direction orthogonal to the axial line, and both ends are semicircular.

  In the axial direction portion of each cylinder 22, the inside of the crank chamber 18 and the oil pan 14 are blocked by the baffle plate, and there is no hole such as the communication hole 42 in this portion.

  The boss portions 44a to 44f are for fixing the baffle plate 10 to the oil pan 14, and bolts (not shown) are inserted therethrough.

The baffle plate 10 is provided with a flange 45 over the entire circumference so as to connect the boss portions 44a to 44f to the peripheral edge portion, and is suitable for fixing to the oil pan.

  The baffle plate 10 is provided with short grooves 46 that connect between the communication recesses 40a and the communication recesses 40c arranged in parallel and between the communication recesses 40b and the communication recesses 40d. The groove 46 is shaped to bulge in the direction of the oil pan 14 like the communication recesses 40a to 40d, is shallower than the communication recesses 40a to 40d, and connects the parallel communication recesses with a constant width and a constant depth. Yes.

  Next, the operation of the baffle plate 10 configured as described above will be described.

  In the internal combustion engine 12, each piston 26 moves up and down to suck or push air into the crank chamber 18. In each cylinder row 24a and 24b, the three pistons 26 move up and down at different phases (for example, 240 °). Therefore, when one of the pistons 26 descends and pushes air into the crank chamber 18, the adjacent pistons 26 are substantially in reverse phase and rise considerably to suck air from the crank chamber 18.

  As shown in FIG. 2, for example, when the piston 26 of the cylinder 22a in the cylinder row 24a is lowered, the piston 26 of the adjacent cylinder 22b is considerably raised. Since the communication concave portion 40a is provided in the axial direction portion extending between the cylinders 22a and 22b, even if the counterweight 32 occupies a considerable portion of the space below the cylinder 22a, it is indicated by an arrow A. In addition, it will be easily understood that air flows into the cylinder chamber 34 of the cylinder 22b through the communication recess 40a. Since the communication recess 40a has a smooth curved shape, air smoothly flows from the cylinder 22a side toward the cylinder 22b side. A communication hole 42 is provided at the bottom of the communication recess 40a. The communication hole 42 has an elongated shape parallel to the axis of the crankshaft 30 (that is, the direction of air flow), and the bottom of the communication recess 40a. It is provided in the location of the substantially horizontal plane, and does not obstruct the air flow.

  Further, there is no hole such as the communication hole 42 in the axial direction portion of the plurality of cylinders 22 arranged in series, and the crank chamber 18 and the oil pan 14 are blocked by the baffle plate 10. Therefore, most of the air pushed down by the piston 26 hits the baffle plate 10, and can be prevented from directly taking off into the space portion below the baffle plate 10.

  By providing such a communication recess 40, in the internal combustion engine 12, the air flow between the cylinders 22 becomes smooth, and the pumping loss is reduced. In addition, the air rarely enters and exits the oil pan 14 and the crank chamber 18, and the oil rampage in the oil pan 14 can be suppressed.

  In addition, a communication hole 42 is provided at each bottom of the communication recesses 40a to 40d, so that oil falling from above can be quickly returned from the communication recess 40 into the oil pan 14, and the communication recess 40 serves as an air passage. There is no loss of function. The communication hole 42 has an elongated shape that is parallel to the axis of the crankshaft 30, has an appropriate area, and can easily return oil into the oil pan 14. The baffle plate 10 has no recesses other than the communication recesses 40a to 40d, and oil falling from above is not unnecessarily stored.

  Further, the groove 46 acts as an oil passage between the communicating recesses 40 arranged in parallel, and can return the oil into the oil pan 14 more reliably and quickly. That is, even if the oil temporarily accumulates in the predetermined communication recess 40 due to some factor, the oil is guided to the adjacent communication recess 40 that bypasses the groove 46 and is arranged in parallel.

  The groove 46 also acts as a rib, can increase the rigidity of the baffle plate 10 and reduce vibration. It will be understood from FIG. 3 that if the groove 46 does not exist, it is easy to bend between the communicating recesses 40 arranged in parallel.

  The groove 46 also functions as an air communication path. In other words, in the two cylinder rows 24a and 24b, the pistons 26 of the cylinders 22 that are adjacent to each other (more precisely, slightly offset along the axis of the crankshaft 30) are in substantially opposite phases (for example, 120 °). Therefore, air flows through the groove 46, and the pumping loss is further reduced.

  As described above, according to the baffle plate 10 according to the present embodiment, the communication recess 40 is provided, so that the air flow between the cylinders 22 is smooth, and the pumping loss is reduced. Oil rampage can be suppressed.

  Although the internal combustion engine 12 is a V-type 6 cylinder, the shape is made to correspond to other internal combustion engines having an in-line cylinder arrangement, for example, internal combustion engines such as a V-type 8-cylinder, an in-line 4 cylinder, and an in-line 6 cylinder. Therefore, the baffle plate 10 can be suitably applied.

  The baffle plate 10 is an example of a cast iron plate. For example, the baffle plate 10 has an appropriate thickness and is provided with communication recesses 40a to 40d that are curved in a concave shape toward at least the crank chamber 18 side. What is necessary is just to be the structure which does not protrude to the oil pan 14 side. Of course, the baffle plate according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

It is a section side view of an internal-combustion engine provided with a baffle plate concerning this embodiment. It is II-II arrow sectional drawing in FIG. It is a perspective view of the baffle plate concerning this embodiment. It is a top view of the baffle plate which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Baffle plate 12 ... Internal combustion engine 13a ... Cylinder head 13b ... Cylinder block 13c ... Lower block 14 ... Oil pan 18 ... Crank chamber 20 ... Oil 22, 22a-22c ... Cylinder 24a, 24b ... Cylinder row 26 ... Piston 30 ... Crank Shaft 34 ... Cylinder chamber 40a-40d ... Communication recess 42 ... Communication hole 44a-44f ... Boss part 45 ... Flange 46 ... Groove 47a, 47b ... Horizontal rib 47c ... Vertical rib

Claims (6)

In a baffle plate provided between a crank chamber and an oil pan in a multi-cylinder internal combustion engine,
A baffle plate having a communicating recess that curves in a concave shape toward the crank chamber side at a portion in the axial direction of the cylinder between adjacent cylinders among a plurality of cylinders arranged in series . The baffle plate according to claim 1,
The baffle plate according to claim 1, wherein a communication hole for communicating the crank chamber and the oil pan is provided at the bottom of the communication recess. The baffle plate according to claim 1 or 2,
The internal combustion engine has a plurality of cylinder rows,
The communication recess is formed in parallel corresponding to the cylinder row,
A baffle plate comprising a groove connecting between the two communicating recesses arranged in parallel. In the baffle plate according to any one of claims 1 to 3,
The baffle plate is characterized in that at least two communication recesses are provided, and a boss portion for fixing to the oil pan is formed at at least one position between the adjacent communication recesses. In the baffle plate according to any one of claims 1 to 4,
The baffle plate is characterized in that a crank chamber and an oil pan are blocked by the baffle plate in an axial direction portion of each cylinder. In the baffle plate according to any one of claims 2 to 5,
The baffle plate is characterized in that the communication hole has a shape parallel to the axis of the crankshaft and having an axial length longer than an orthogonal width.

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