JP2008267163A - Baffle plate and baffle plate mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a baffle plate for enhancing an oil defoaming and oil temperature suppressing effect and for enhancing an oil stirring resistance suppressing effect by effectively removing oil splashes generated by the rotation of a crankshaft. <P>SOLUTION: Since the baffle plate 12 is disposed above the crankshaft 4 to orient in the direction of rotation, the plate can effectively receive the oil splashes generated accompanied by the rotation of the crankshaft 4 by its splashing portions. Even though oil on surfaces of a connecting rod 8 and a counterweight 10 leave or intend to leave from the surfaces at the initial stage of the rotation of the crankshaft toward the lower side, the baffle plate 12 of which tips 12e and 12g come near the crankshaft 4 can receive the oil. The oil is guided to flow downward from the tips 12e and 12g of the baffle plate 12 toward its base end. The oil flows along the lower wall surface of the baffle plate 12 in a form of a gentle stream and then flows into an oil sump of an oil pan, to solve the problem. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a baffle plate and a baffle plate mechanism provided in a crankcase of an internal combustion engine.

  A baffle plate is used in order to prevent bubbles from being mixed into the oil or an increase in the oil temperature due to oil scattering and stirring accompanying the rotation of the crankshaft (see, for example, Patent Documents 1 and 2). In Patent Document 1, the second baffle plate attached to the bearing cap causes the oil scattered by the rotation of the crankshaft to directly jump into the strainer mounting hole of the first baffle plate, or the rotation of the crankshaft acts on the oil surface. Is preventing. Further, the oil flows along the two baffle plates to produce a defoaming effect.

Also in Patent Document 2, by overlapping a plurality of baffle plates, separating oil splashes in the airflow generated by rotation of the crankshaft and removing it from the crankcase, the oil stirring resistance generated in the crankshaft is suppressed. .
Japanese Utility Model Publication No. 60-61419 (page 5-8, Fig. 1) Japanese Patent Laying-Open No. 2005-171777 (page 3-5, FIG. 1-2)

  In Patent Document 1, oil that has dropped from the rotation region of the crankshaft is received, and oil that is scattered in the rotation region or its peripheral region or oil that adheres to the crankshaft is positively excluded. However, it cannot be said that suppression of oil stirring resistance is sufficient.

  In Patent Document 2, a baffle plate that rectifies an air flow generated by rotation of a crankshaft is provided. However, since this baffle plate for air rectification exists in the rotational direction (on the upper side is opposite to the rotational direction) on the lower side of the crankshaft, oil splashes are once in the air on the baffle plate for oil separation. Is charged. For this reason, it cannot be said that suppression of oil agitation resistance in the space between the oil separation baffle plate and the crankshaft is sufficient.

  An object of the present invention is to enhance the effect of suppressing oil agitation resistance by effectively eliminating oil splashes caused by rotation of the crankshaft, together with defoaming and oil temperature suppressing effects.

  In the following, means for achieving the above object and its effects are described.

  The baffle plate according to claim 1 is present in the rotation direction of the crankshaft above the crankshaft in the crankcase of the internal combustion engine, and is long in the axial direction of the crankshaft on the wall surface along the axial direction of the crankshaft. The distal end portion is disposed close to the crankshaft in a space above the proximal end portion connected to the wall surface side, and the proximal end portion forms an opening that penetrates up and down. It is characterized by that.

  In the space above the crankshaft, a large amount of oil splashes generated by the rotation of the crankshaft and the supply of oil such as an oil jet are rotated in the direction of rotation on the upper side of the crankshaft (rotation on the lower side). Jump out to the oil pan side from the direction opposite to the direction).

  As described above, the baffle plate exists in the rotational direction on the upper side of the crankshaft, and is long on the wall surface along the axial direction of the crankshaft in the axial direction of the crankshaft. Therefore, the splash of oil can be effectively received and eliminated at the protruding portion, and this prevents the oil splash from jumping to the oil pan side.

  Furthermore, since the tip of the baffle plate is located close to the crankshaft, the oil that has wetted the upper surface of the crankshaft has moved away from the surface of the crankshaft just before the oil has rotated downward. The oil can be effectively received and eliminated. Therefore, it is possible to prevent such oil splash from jumping to the oil pan side.

  And since the tip of the baffle plate exists in a space above the base end connected to the wall surface side, the received oil splash does not fall from the tip of the baffle plate to the oil pan side, and the base end. Oil can flow down to the side.

  Since the base end portion forms an opening that penetrates up and down, the oil that has flowed down to the base end side of the baffle plate flows out from the opening to the bottom of the baffle plate. In this outflow, since the opening is formed at the base end, the oil is transmitted to the wall surface on which the baffle plate is provided, and flows into the bottom surface of the oil pan and the oil reservoir over time as a gentle flow. . In this way, oil defoaming and oil temperature cooling effect can be produced while flowing from the baffle plate over the wall surface to the bottom surface of the oil pan and the oil reservoir.

  Thus, since the oil splash by rotation of a crankshaft can be excluded effectively with a defoaming and oil temperature suppression effect, the suppression effect of oil stirring resistance can be heightened.

  The baffle plate according to a second aspect is characterized in that, in the first aspect, the tip portion is formed with a protruding portion that protrudes along a side surface of a counterweight of the crankshaft.

  Furthermore, the protrusion can be formed from the tip of the baffle plate. Since the protruding portion protrudes along the side surface of the counterweight of the crankshaft, oil splashes existing between the side surfaces of the counterweight and oil that is about to jump out from the side surface of the counterweight can be received at an early stage.

  This can also prevent the oil on the side of the counterweight and the oil splashes existing in the space between the sides from falling to the oil pan side, further enhancing the defoaming effect, oil temperature suppression effect, and oil stirring resistance suppression effect be able to.

  The baffle plate according to a third aspect is characterized in that, in the second aspect, the protrusion is formed at a position corresponding to the bearing cap in the axial direction of the crankshaft.

  More specifically, the protruding portion is provided at a position corresponding to the bearing cap, and in an axial space where the bearing cap is disposed, the protruding portion tries to jump out of oil splashes or counterweight existing between the side surfaces of the counterweight. Oil can be received early.

  The baffle plate according to a fourth aspect is characterized in that, in the second or third aspect, the projecting portion extends obliquely upward toward the bearing cap.

  More specifically, the protrusion extends obliquely upward toward the bearing cap, so that the received oil does not fall from the tip of the baffle plate to the oil pan side, and the oil is supplied to the opening on the base end side. It can flow.

  A baffle plate mechanism according to a fifth aspect includes an upper baffle plate having the same configuration as the baffle plate according to any one of the first to fourth aspects, an oil that is disposed below the upper baffle plate and accumulated in an oil pan. A lower baffle plate mechanism that covers the lower baffle plate, wherein the lower baffle plate forms a gap with a wall surface in the crankcase corresponding to the position of the opening formed in the upper baffle plate. It is characterized by that.

  By arranging the lower baffle plate in this way, it is possible to prevent the crankshaft rotation from affecting the oil accumulated in the oil pan, and the oil splash that could not be received by the upper baffle plate is directly applied to the bottom surface of the oil pan. And it can prevent falling into the oil reservoir.

  Furthermore, since the lower baffle plate forms a gap between the lower baffle plate and the wall surface corresponding to the position of the opening of the upper baffle plate, the oil flowing down from the opening to the wall surface is stored on the lower baffle plate. It can lead to the bottom of the oil pan and the oil reservoir quickly and gently without any problems.

  Thus, the oil received by the upper baffle plate does not flow down on the lower baffle plate, so that the amount of oil on the lower baffle plate does not become excessive and does not become a rotational resistance on the crankshaft side.

  As a result, oil agitation due to rotation of the crankshaft can be more effectively prevented, and the defoaming effect, the oil temperature suppression effect, and the oil agitation resistance suppression effect can be further enhanced.

[Embodiment 1]
1 to 3 are partial cutaway views showing a crankcase periphery of an internal combustion engine to which the above-described invention is applied, excluding the cylinder block side. 1 and 3 are perspective views, and FIG. 2 is a plan view. The oil pan 2 forming a part of the crankcase is bolted to the lower side of the cylinder block with a flange portion 2a formed at the upper edge portion thereof.

  A crankshaft 4 is rotatably supported by a bearing cap 6 on a journal bearing formed on the lower side of the cylinder block. The internal combustion engine in the present embodiment is an in-line four cylinder, and the crankshaft 4 is formed with four crankpins. A connecting rod 8 connected to the piston 7 is rotatably attached to each crank pin. In the axial direction of the crankshaft 4, counterweights 10 are formed at portions where the crankshaft 4 and the crankpin are coupled on both sides of each connecting rod 8.

  Of the inner wall surface of the oil pan 2 constituting the crankcase, a wall surface that exists in the rotational direction (shown by the solid line arrow) on the upper side of the crankshaft 4 and that extends along the axial direction of the crankshaft 4 Is attached with a baffle plate 12 that is long in the axial direction of the crankshaft 4. The crankcase means a storage portion of the crankshaft 4 that is formed of the cylinder block lower part and the oil pan 2 and is formed surrounding the crankshaft 4.

  FIG. 4 shows the configuration of the baffle plate 12. 4A is a plan view, FIG. 4B is a perspective view, and FIG. 4C is a left side view.

  The baffle plate 12 is made of a heat resistant material, for example, a metal plate such as an iron alloy or an aluminum alloy, and includes a base portion 12a and a protruding portion 12b. The base portion 12a is a long plate-like body, and as shown in the perspective view of FIG. 5, the base portion 12a is mounted on the base end portion side of the base portion 12a in a state of being long disposed along the axial direction of the crankshaft 4. The portion 12c is fixed to the wall surface 2b side of the oil pan 2. Furthermore, a plurality of openings 12d are formed in the base portion 12a so as to be adjacent to the attachment portion 12c and arranged in the longitudinal direction.

  The protruding portion 12b is integrally formed with the base portion 12a at the distal end portion 12g of the base portion 12a. The arrangement of the protruding portions 12 b is a position corresponding to each bearing cap 6 in the axial direction of the crankshaft 4. The projecting portion 12b extends obliquely upward toward the bearing cap 6, and is disposed so as to project along the side surface of the counterweight 10 in each cylinder in the axial direction of the crankshaft 4. The tip 12e of the protrusion 12b is in the vicinity of the bearing cap 6 and does not contact the bearing cap 6, but may contact the bearing cap 6 or the outside of the journal bearing on the cylinder block side.

  The edge portion 12f of the protruding portion 12b is near the side surface of the counterweight 10 but is not in contact with the counterweight 10. The distance between the edge portion 12f and the counterweight 10 is set to such an extent that the oil that has been separated from the surface of the counterweight 10 touches the edge portion 12f. This distance is set in advance by experiment or estimation calculation.

  The distal end portion 12g of the base portion 12a is disposed close to the crankshaft 4 (here, the peripheral surface of the counterweight 10) in a space above the base end portion side (mounting portion 12c side) of the base portion 12a. However, it does not contact the peripheral surface of the counterweight 10. Also in this case, the distance between the tip portion 12g and the counterweight 10 is set to such an extent that the oil that has been separated from the surface of the counterweight 10 touches the tip portion 12g. This distance is set in advance by experiment or estimation calculation.

  Thus, during operation of the internal combustion engine in which the baffle plate 12 is disposed in the oil pan 2, the crankshaft 4, the bearing cap 6, the piston 7, the connecting rod 8, and the counterweight 10 from the oil jet and other various oil supply systems. Oil is supplied to the crankpin and the like. Due to the rotation of the crankshaft 4, the oil flows on the surfaces and gaps of the respective members mainly above the crankshaft 4 or scatters in the space. Since the crankshaft 4 rotates in the direction of the solid line arrow, these oil flows and oil splashes move toward the upper rotation direction of the crankshaft 4, that is, the wall surface 2b side where the baffle plate 12 is provided.

  The oil that has moved to the wall surface 2b side in the space above the crankshaft 4 tends to flow or drop into the space below the crankshaft 4 from the gap between the crankshaft 4 and the wall surface 2b. However, the baffle plate 12 fixed to the wall surface 2b extends to the side surface and the outer periphery of the counterweight 10 and the connecting rod 8 provided on the crankshaft 4. For this reason, as shown by the broken line arrows in the perspective view of FIG. 6 and the left side view of FIG. 7, the oil splashes and the oil that has left the counterweight 10 and the connecting rod 8 are scooped by the baffle plate 12 and It will flow on the surface. In FIG. 6, only the baffle plate 12 is shown on the oil pan 2 side.

  Since the opening 12d penetrating the base 12a up and down is disposed at the lowest position of the baffle plate 12, the oil flowing down the surface of the baffle plate 12 is discharged downward from the opening 12d. As a result, it flows through the wall surface 2 b below the baffle plate 12 and accumulates in the oil pan 2.

  According to the first embodiment described above, the following effects can be obtained.

  (I). The baffle plate 12 exists in the rotation direction on the upper side of the crankshaft 4 (on the lower side opposite to the rotation direction), and is attached to the wall surface 2 b along the axial direction of the crankshaft 4. For this reason, the oil splashes generated by the rotation of the crankshaft 4 or the oil jet in the upper space of the crankshaft 4 try to jump out to the oil pan 2 side as the crankshaft 4 rotates. , Can be received effectively at the protruding part. As a result, oil splashes can be prevented from jumping into the oil pan 2 side.

  Even if the oil on the upper surface of the crankshaft 4, here the surface of the connecting rod 8 or the counterweight 10, rotates away from the surface at an early stage of rotation, the crankshaft 4 has a tip 12 g. The oil can be received by the baffle plate 12 that is close to. Therefore, such oil splash can be prevented from jumping to the oil pan 2 side.

  The base portion 12a of the baffle plate 12 is disposed close to the crankshaft 4, in this case, the connecting rod 8 and the counterweight 10, in a space above the base end portion side where the distal end portion 12g is connected to the wall surface 2b side. ing. As a result, oil can flow down from the distal end portion 12g of the baffle plate 12 to the proximal end portion side of the base portion 12a without dropping to the oil pan 2 side. The oil that has flowed to the base end side of the base portion 12a flows out from the opening 12d formed in the base portion 12a to the lower side of the baffle plate 12. In this case, since the opening 12d is formed on the base end side of the base portion 12a, the oil is transmitted to the lower wall surface 2b of the baffle plate 12 and becomes a gentle flow, so that the oil storage portion (oil reservoir) of the oil pan 2 is obtained. It flows into 2c. As described above, the oil defoaming and the oil temperature cooling effect are generated while flowing from the baffle plate 12 through the wall surface 2b to the oil reservoir 2c.

  In this way, oil splashes due to rotation of the crankshaft 4 can be effectively eliminated together with defoaming and oil temperature suppressing effects, and the effect of suppressing oil stirring resistance can be enhanced.

  (B). A protruding portion 12 b is formed from the tip portion 12 g of the baffle plate 12. Since this protrusion 12b protrudes along the side surface of the counterweight 10 of the crankshaft 4, oil splashes existing between the side surfaces of the counterweight 10 and oil that is about to jump out from the side surface of the counterweight 10 are also received early. be able to.

  As a result, the oil on the side surface of the counterweight 10 and the oil splashes existing in the space between the side surfaces can be prevented from falling to the oil pan 2 side, and the defoaming effect, the oil temperature suppressing effect, and the oil stirring resistance suppressing effect are further improved. Can be increased.

[Embodiment 2]
The arrangement configuration of the two baffle plates 112 and 120 of the present embodiment in the oil pan 102 is shown in the perspective view of FIG. 8 and the left side view of FIG. In FIG. 8, only the oil pan 102 is shown.

  In the present embodiment, the upper baffle plate 112 having the same shape as the baffle plate of the first embodiment is arranged on the wall surface 102b in the rotational direction on the upper side of the crankshaft 104. In addition, a lower baffle plate 120 is disposed below the upper baffle plate 112 and between the crankshaft 104 and the bottom surface of the oil pan 102. The lower baffle plate 120 is a plate material made of a heat-resistant material, for example, a metal plate such as an iron alloy or an aluminum alloy, and curved downward. The lower baffle plate 120 is fixed at several positions in the oil pan 102 at the peripheral edge.

  The lower baffle plate 120 prevents the rotation on the crankshaft 104 side from affecting the oil accumulated in the oil pan 102, and oil that cannot be received by the upper baffle plate 112 directly includes the oil reservoir 102c. It is prevented from falling on the bottom surface of 102. The lower baffle plate 120 is inclined in the axial direction of the crankshaft 104 so that oil that cannot be received by the upper baffle plate 112 is received and gently flows down to the oil reservoir 102c side.

  Further, the lower baffle plate 120 forms a gap 120a with respect to the wall surface 102b to which the upper baffle plate 112 is attached. For this reason, as indicated by the broken arrow in the figure, the oil that is received by the base 112a and the protrusion 112b of the upper baffle plate 112 and flows down from the opening 112d through the wall surface 102b passes through the gap 120a, and stores oil. The oil flows down to the bottom surface of the oil pan 102 including the portion 102c.

  According to the second embodiment described above, the following effects can be obtained.

  (I). The presence of the upper baffle plate 112 produces the effect of the first embodiment.

  The presence of the lower baffle plate 120 can prevent the influence of rotation of the crankshaft 104 and prevent oil splashes that could not be received by the upper baffle plate 112 from directly falling on the bottom surface of the oil pan 102 and the oil reservoir 102c.

  Further, the lower baffle plate 120 forms a gap 120a with the wall surface 102b corresponding to the position of the opening 112d of the upper baffle plate 112. For this reason, the oil flowing out from the opening 112d and flowing down to the wall surface 102b can be promptly and gently guided to the bottom surface of the oil pan 102 and the oil reservoir 102c without being stored on the lower baffle plate 120. it can.

  Thus, since the oil received by the upper baffle plate 112 does not flow down on the lower baffle plate 120, the amount of oil on the lower baffle plate 120 does not become excessive, and the rotation with respect to the connecting rod 108 and the counterweight 110 on the crankshaft 104 side. There is no resistance.

  As a result, oil agitation due to rotation of the crankshaft 104 can be more effectively prevented, and the defoaming effect, the oil temperature suppression effect, and the oil agitation resistance suppression effect can be further enhanced.

[Embodiment 3]
The arrangement configuration in the oil pan 202 in the baffle plate 212 of the present embodiment is shown in the perspective view of FIG. 10, and the positional relationship with the crankshaft 204 side is shown in the perspective view of FIG.

  The present embodiment is different from the first embodiment in that the baffle plate 212 includes a base portion 212a and an opening portion 212d and no protruding portion exists. Other configurations are the same as those of the first embodiment.

  According to the third embodiment described above, the following effects can be obtained.

  (I). The tip end portion 212g of the baffle plate 212 is in a space above the base end side connected to the wall surface 202b and is brought close to the crankshaft 204. As a result, the oil splashing out from the upper space of the crankshaft 204 and the oil trying to jump out from the surface of the crankshaft 204 can be received by the baffle plate 212. The oil received in this manner can flow down to the base end side of the base 212a without dropping from the tip 212g of the baffle plate 212 to the oil pan 202 side. The oil that has flowed to the base end side of the base 212a flows out from the opening 212d to the lower side of the baffle plate 212.

  Then, the oil is transmitted to the wall surface 202b on which the baffle plate 212 is provided, becomes a gentle flow, and flows into the bottom surface of the oil pan 202 and the oil reservoir 202c. During this period, oil defoaming and oil temperature cooling effects can be produced.

  Therefore, the effect described in the first embodiment (A) can be produced.

[Other embodiments]
(A). In the above-described embodiment (FIGS. 1 to 11), the baffle plates 12, 112, and 212 are attached to the oil pan, but may be provided in the lower part of the cylinder block as long as they are within the crankcase.

  (B). The lower baffle plate 120 (FIGS. 8 and 9) of the second embodiment may be combined with the configuration of the third embodiment.

  (C). In the first and second embodiments (FIGS. 1 to 9), the protrusions 12b and 112b are provided at five locations. However, depending on the shape of the lower part of the cylinder block and the shape of the bearing cap, the protrusions 12b and 112b at both ends are provided. There may be no placement space. In this case, the baffle plates 12 and 112 are provided with three protrusions at the center.

  (D). Each of the above embodiments is an example of a four-cylinder in-line internal combustion engine, but the present invention can be similarly applied to a number of cylinders other than four cylinders or other than in-line.

FIG. 2 is a partially broken perspective view showing a configuration around a crankcase of the internal combustion engine of the first embodiment. FIG. FIG. FIG. 3 is an explanatory diagram showing a baffle plate configuration according to the first embodiment. FIG. 3 is a partially broken perspective view showing the inside of the oil pan according to the first embodiment. The perspective view which shows the relationship between the crankshaft and baffle plate of Embodiment 1. FIG. The left side view. FIG. 4 is a partially broken perspective view showing the inside of an oil pan according to a second embodiment. The left view which shows the relationship between the crankshaft of Embodiment 2, and two baffle plates. FIG. 6 is a partially broken perspective view showing the inside of an oil pan according to a third embodiment. FIG. 9 is a partially broken perspective view showing a relationship between a crankshaft and a baffle plate according to a third embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Oil pan, 2a ... Flange part, 2b ... Wall surface, 2c ... Oil storage part, 4 ... Crankshaft, 6 ... Bearing cap, 7 ... Piston, 8 ... Connecting rod, 10 ... Counterweight, 12 ... Baffle plate, 12a ... Base part, 12b ... Projection part, 12c ... Mounting part, 12d ... Opening part, 12e ... Tip part, 12f ... Edge part, 12g ... Tip part, 102 ... Oil pan, 102b ... Wall surface, 102c ... Oil storage part, 104 ... Crank 110, connecting rod, 110 ... counterweight, 112 ... upper baffle plate, 112a ... base, 112b ... projection, 112d ... opening, 120 ... lower baffle plate, 120a ... gap, 202 ... oil pan, 202b ... wall surface, 202c ... Oil reservoir, 204 ... Crankshaft, 212 ... Baffle Over DOO, 212a ... base, 212d ... opening, 212g ... tip.

Claims (5)

In the crankcase of the internal combustion engine, it exists in the rotation direction of the crankshaft on the upper side of the crankshaft, and is disposed long in the axial direction of the crankshaft on the wall surface along the axial direction of the crankshaft,
The distal end portion is arranged close to the crankshaft in a space above the proximal end portion connected to the wall surface side,
The baffle plate is characterized in that the base end portion forms an opening that penetrates vertically. 2. The baffle plate according to claim 1, wherein a protruding portion that protrudes along a side surface of a counterweight of the crankshaft is formed at the tip portion. The baffle plate according to claim 2, wherein the protrusion is formed at a position corresponding to the bearing cap in the axial direction of the crankshaft. 4. The baffle plate according to claim 2, wherein the protrusion extends obliquely upward toward the bearing cap. An upper baffle plate having the same configuration as the baffle plate according to any one of claims 1 to 4,
A lower baffle plate disposed below the upper baffle plate and covering the oil accumulated in the oil pan;
A baffle plate mechanism comprising:
The baffle plate mechanism according to claim 1, wherein a gap is formed between the lower baffle plate and a wall surface in the crankcase corresponding to a position of an opening formed in the upper baffle plate.

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