JP7392500B2 - engine - Google Patents

Description

The present invention relates to an engine.

BACKGROUND ART Conventionally, an engine described in Patent Document 1 is known as an engine including an oil passage that returns oil separated from blow-by gas in an oil separation chamber to an oil pan. The engine described in Patent Document 1 has an oil separation chamber on the side surface of the cylinder block, and has an oil drain hole on the bottom surface of the oil separation chamber. Further, an oil drain passage is formed inside the cylinder block, and the oil drain hole communicates with the oil pan through the oil drain passage.

Further, in the engine described in Patent Document 1, the opening at the lower end of the oil drain passage is formed to be smaller than the oil drain hole, and is sandwiched between the lower part of the cylinder block and the upper part of the oil pan communicating with this lower part. are doing.

As a result, in the engine described in Patent Document 1, viscous oil accumulates in the oil drain passage and flows down to the oil pan while keeping the oil drain passage covered. Therefore, oil mist can be prevented from flowing back from the oil pan to the oil separation chamber through the oil passage.

Japanese Patent Application Publication No. 2016-200136

However, in the engine described in Patent Document 1, since the side wall of the oil pan is disposed below the opening at the lower end of the oil passage, an oil reservoir cannot be formed. In some cases, the capacity of the oil reservoir chamber was limited (see Figure 5). For this reason, in the engine described in Patent Document 1, there was room for consideration to ensure the capacity of the oil reservoir chamber.

The present invention has been made with attention to the above-mentioned circumstances, and it is possible to secure the capacity of the oil reservoir chamber of the oil pan, and also prevent oil from entering from the lower end of the oil drop passage and flowing back into the blow-by gas chamber. The purpose of this invention is to provide an engine that can prevent this.

The present invention provides a cylinder block having a crank chamber, an oil pan having an oil reservoir chamber and fastened to the bottom of the cylinder block, a side wall of the cylinder block extending in the direction of the crankshaft, and a side wall of the cylinder block. a blow-by gas chamber through which blow-by gas passes; an oil drop passage that communicates the blow-by gas chamber with the oil pan and returns oil separated from the blow-by gas to the oil reservoir chamber; a baffle plate disposed above, the cylinder block having an oil outlet hole at a lower end of the oil drop passage that opens above the oil reservoir chamber, and the baffle plate comprising: The cylinder block has an edge fastened to the bottom of the cylinder block, and a shielding part provided on the edge to close the oil outlet hole, and the shielding part allows oil that has fallen through the oil drop passage to pass therethrough. The baffle plate has an oil drop hole, the oil outlet hole is arranged closer to the center of the crank chamber than the edge, and the baffle plate includes a vertical wall bent from the edge and extending downward, a bottom wall extending from a lower end toward the center of the crank chamber, and the shielding portion has a top wall with the edge protruding inside the crank chamber along the lower end of the oil drop passage; The crankshaft is characterized by having a peripheral wall extending from the outer edge of the top wall to the bottom wall and bulging from the vertical wall into the crank chamber .

As described above, the present invention provides an engine that can secure the capacity of the oil reservoir chamber of the oil pan and prevent oil from entering from the lower end of the oil drop passage and flowing back into the blow-by gas chamber. be able to.

FIG. 1 is a rear view of an engine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the engine shown in FIG. 1 taken along the line II-II. FIG. 3 is a bottom view of a cylinder block and a crankshaft of an engine according to an embodiment of the present invention. FIG. 4 is a bottom view of a cylinder block of an engine according to an embodiment of the present invention. FIG. 5 is a bottom view of the cylinder block and baffle plate of the engine according to one embodiment of the present invention. FIG. 6 is a perspective view of a baffle plate of an engine according to an embodiment of the present invention. FIG. 7 is a plan view of a baffle plate of an engine according to an embodiment of the present invention.

An engine according to an embodiment of the present invention includes a cylinder block having a crank chamber, an oil pan having an oil reservoir chamber and fastened to the bottom of the cylinder block, and a side wall of the cylinder block extending in the crankshaft direction. A blowby gas chamber that is arranged on the side wall of the cylinder block and through which blowby gas passes; an oil drop passage that communicates between the blowby gas chamber and the oil pan and returns oil separated from the blowby gas to the oil reservoir chamber; and an oil reservoir chamber. An engine comprising: a baffle plate disposed above the cylinder block; the cylinder block has an oil outlet hole opening above the oil reservoir chamber at the lower end of the oil drop passage; It has an edge fastened to the bottom and a shielding part provided on the edge to block the oil outlet hole, and the shielding part has an oil drop hole through which oil that has fallen through the oil drop passage can pass. Features. As a result, the engine according to the embodiment of the present invention can secure the capacity of the oil reservoir chamber of the oil pan, and can prevent oil from entering from the lower end of the oil drop passage and flowing back into the blow-by gas chamber. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS An engine according to an embodiment of the present invention will be described below with reference to the drawings. 1 to 7 are diagrams showing an engine according to an embodiment of the present invention. 1 to 7, the up, down, front, back, left, and right directions are the up, down, front, back, left, and right directions of the engine installed in the vehicle, the direction orthogonal to the front and back direction is the left and right direction, and the height direction of the engine is the up and down direction. .

First, the configuration will be explained. In FIG. 1, an engine 1 includes an engine main body 1A. The engine main body 1A includes a cylinder block 3 and a cylinder head (not shown) connected to the upper part of the cylinder block 3. A head cover (not shown) is fixed to the upper part of the cylinder head. The engine body 1A includes an oil pan 4 fastened to the bottom of the cylinder block 3. The engine body 1A includes a cylinder block 3 and a chain cover 5 fastened to the right end of the cylinder head. The chain cover 5 covers a timing chain (not shown).

In FIG. 3, the cylinder block 3 accommodates a crankshaft 11 that converts the vertical movement of the piston into rotational movement, and the crankshaft 11 extends in the left-right direction.

In FIG. 4, the cylinder block 3 is formed with a plurality (three) of cylinders 7 that accommodate pistons (not shown) in a vertically movable manner. The cylinders 7 are arranged side by side in the left-right direction in which the crankshaft 11 extends (hereinafter also referred to as the crankshaft direction or the cylinder row direction).

In FIG. 1, the cylinder block 3 has a side wall 3A extending in the crankshaft direction. The side wall 3A constitutes the rear surface of the cylinder block 3, that is, the rear side surface. The side wall 3A extends in the crankshaft direction.

In FIG. 4, a plurality (four in this embodiment) of crankshaft support walls 12 are provided at the bottom of the cylinder block 3. The crankshaft support wall 12 extends in a direction (front-rear direction) orthogonal to the cylinder row direction. The crankshaft support wall 12 is arranged between the three cylinders 7 in the cylinder block 3 in the cylinder row direction.

In FIG. 3, a bearing cap 13 is fixed to the crankshaft support wall 12 from below. The crankshaft support wall 12 supports the crankshaft 11 together with the bearing cap 13.

1 and 2, a blow-by gas chamber 19 through which blow-by gas passes is formed in the side wall 3A of the cylinder block 3. The blow-by gas chamber 19 is a space surrounded by a wall portion 19A protruding from the surface of the side wall 3A and a lid member (not shown) attached to the wall portion 19A. The blow-by gas chamber 19 is provided with a rib 15 extending in the vertical direction. The oil component in the blow-by gas is separated when the blow-by gas collides with the ribs 15 in the blow-by gas chamber 19. Note that the blow-by gas chamber 19 is partitioned into three internal spaces by two partition walls 19B.

In FIG. 2, a crank chamber 24 is provided inside the cylinder block 3. The blow-by gas that has flowed into the crank chamber 24 is introduced into the blow-by gas chamber 19 through a passage (not shown).

An oil reservoir chamber 4A is provided inside the oil pan 4, and oil is stored in the oil reservoir chamber 4A. A baffle plate 30 is provided inside the oil pan 4. The baffle plate 30 is arranged above the oil reservoir chamber 4A.

1 and 2, an oil drop passage 20 is formed in the cylinder block 3 so as to extend in the vertical direction. The oil drop passage 20 communicates the blow-by gas chamber 19 and the oil pan 4, and returns the oil separated from the blow-by gas to the oil reservoir chamber 4A. In this embodiment, two oil drop passages 20 are provided in the cylinder block 3.

The cylinder block 3 has an oil inlet hole 21 at the upper end of an oil drop passage 20. The oil inlet hole 21 is arranged at the bottom of the blow-by gas chamber 19, and the oil separated from the blow-by gas in the blow-by gas chamber 19 flows into the oil drop passage 20 from the oil inlet hole 21.

The cylinder block 3 has an oil outlet hole 22 at the lower end of the oil drop passage 20 that opens above the oil reservoir chamber 4A. The oil that has entered the oil drop passage 20 flows out from the oil outlet hole 22 and is returned to the oil reservoir chamber 4A (see FIG. 2) in the oil pan 4.

2, FIG. 5, FIG. 6, and FIG. 7, the baffle plate 30 has an edge 33 fastened to the bottom of the cylinder block 3 by a bolt 41 (see FIGS. 2 and 5). The edge portion 33 is provided with two shielding portions 38 that close the oil outlet hole 22 of the oil drop passage 20.

The shielding part 38 has an oil drop hole 36 through which oil that has fallen through the oil drop passage 20 can pass. The oil drop hole 36 is provided at a portion of the shielding portion 38 that closes the oil outlet hole 22 .

As described above, in this embodiment, since the oil outlet hole 22 is blocked by the shielding part 38 having the oil drop hole 36, the amount of oil flowing out from the oil outlet hole 22 is limited, and the oil drop passage 20 is Oil is temporarily stored.

The oil temporarily stored in the lower part of the oil drop passage 20 blocks the oil passage 20 due to its viscosity, so that the oil mist scattered in the oil reservoir chamber 4A passes through the oil drop passage 20 and enters the blow-by gas chamber. 19 is prevented.

Further, the oil in the oil reservoir chamber 4A in the oil pan 4 tries to enter the oil outlet hole 22 when the vehicle is rocking, but the oil outlet hole 22 is shielded by the shielding part 38 and the shielding part 38 Since the oil drop hole 36 is sufficiently small, the oil stored in the oil reservoir chamber 4A is prevented from flowing back into the blow-by gas chamber 19 through the oil drop passage 20.

In FIG. 2, the oil drop hole 36 is arranged outside (rearward) of the inner wall 23 of the cylinder block 3 in a cross direction (front-rear direction) intersecting the crankshaft direction. Here, the inner wall 23 of the cylinder block 3 is a wall portion of the cylinder block 3 facing the crank chamber 24. The oil outlet hole 22 is arranged closer to the center of the crank chamber 24 than the edge 33 is.

2, 6, and 7, the baffle plate 30 includes a vertical wall 32 bent from an edge 33 and extending downward, and a bottom wall 31 extending from the lower end of the vertical wall 32 toward the center of the crank chamber 24. have. The vertical wall 32 extends in the crankshaft direction. The bottom wall 31 is gently curved downward.

The shielding part 38 has a top wall 35 and a peripheral wall 34. The top wall 35 is a portion with an edge 33 protruding into the crank chamber 24 along the lower end of the oil drop passage 20. The peripheral wall 34 is a portion that extends from the outer edge of the top wall 35 to the bottom wall 31 and bulges out from the vertical wall 32 into the crank chamber 24 .

In FIGS. 5, 6, and 7, the baffle plate 30 has three openings 37 that return the oil that has fallen above the bottom wall 31 to the oil reservoir chamber 4A. The opening 37 is arranged at a position that does not face the shielding part 38 in the cross direction that intersects the crankshaft direction. The openings 37 are provided in the bottom wall 31 near the lower end of the vertical wall 32 and lined up in the crankshaft direction. In other words, the three openings 37 are arranged at the rear end of the bottom wall 31 so as to alternate with the two shielding parts 38 in the crankshaft direction.

As described above, in the engine 1 of this embodiment, the cylinder block 3 has the oil outlet hole 22 at the lower end of the oil drop passage 20, which opens above the oil reservoir chamber 4A. The baffle plate 30 has an edge 33 fastened to the bottom of the cylinder block 3, and a shielding part 38 provided on the edge 33 and closing the oil outlet hole 22, and this shielding part 38 has an oil drop passage. It has an oil drop hole 36 through which oil that has fallen through 20 can pass.

With this configuration, the oil outlet hole 22 at the lower end of the oil drop passage 20 opens above the oil reservoir chamber 4A, so that the oil reservoir chamber 4A can be formed to a position below the edge 33. That is, in this embodiment, instead of semi-blocking the lower end of the oil drain passage by the flange-shaped edge at the upper end of the oil pan as in the one described in Patent Document 1, a part of the edge 33 of the baffle plate 30 is used. The oil outlet hole 22 is closed by a shielding portion 38 . Therefore, the oil reservoir chamber 4A can be formed to a position below the edge 33, and the capacity of the oil reservoir chamber 4A inside the oil pan 4 can be secured without increasing the size of the oil pan 4. .

Further, the oil stored in the oil pan 4 can be prevented from entering the oil outlet hole 22 at the lower end of the oil drop passage 20 and flowing back into the blow-by gas chamber 19.

As a result, the capacity of the oil reservoir chamber 4A of the oil pan 4 can be secured, and oil can be prevented from entering from the lower end of the oil drop passage 20 and flowing back into the blow-by gas chamber 19.

In the engine 1 of this embodiment, the oil drop hole 36 is arranged outside the inner wall 23 of the cylinder block 3 in a direction intersecting the crankshaft direction.

With this configuration, the edge 33 extends beyond the lower end of the inner wall 23 of the cylinder block 3 to the oil drop passage 20, so that the oil that has flowed down the inner wall 23 of the cylinder block 3 flows to the lower side of the baffle plate 30. It never flows. Therefore, it is possible to prevent the oil that has passed along the inner wall 23 of the cylinder block 3 from being sucked into the oil drop passage 20 and flowing back into the blow-by gas chamber 19.

In the engine 1 of this embodiment, the oil outlet hole 22 is arranged closer to the center of the crank chamber 24 than the edge 33 is. The baffle plate 30 has a vertical wall 32 bent from an edge 33 and extending downward, and a bottom wall 31 extending from the lower end of the vertical wall 32 toward the center of the crank chamber 24 . The shielding part 38 includes a top wall 35 with an edge 33 protruding inside the crank chamber 24 along the lower end of the oil drop passage 20, and a top wall 35 extending from the outer edge of the top wall 35 to the bottom wall 31, and extending from the vertical wall 32 to the crank chamber 24. It has a peripheral wall 34 that bulges inside the chamber 24.

With this configuration, the space below the oil drop hole 36 and the space where the crankshaft 11 is arranged can be partitioned by the peripheral wall 34.

Therefore, oil that cools a piston (not shown) by an oil jet injected as the crankshaft 11 rotates within the crank chamber 24 can be prevented from entering the oil drop hole 36 and flowing back into the blow-by gas chamber 19.

In the engine 1 of this embodiment, the baffle plate 30 has an opening 37 that returns oil that has fallen above the bottom wall 31 to the oil reservoir chamber 4A, and the opening 37 has an opening 37 that is arranged at an intersection that intersects with the crankshaft direction. It is arranged at a position that does not face the shielding part 38 in the direction.

With this configuration, the oil that cools the pistons (not shown) by the oil jet injected in the crank chamber 24 as the crankshaft 11 rotates quickly passes through the openings 37 directly below each piston and passes through the oil reservoir chamber 4A. can return to. Therefore, oil can be prevented from accumulating on the upper surface of the baffle plate 30, and oil can be prevented from entering the oil drop hole 36 and flowing back into the blow-by gas chamber 19.

Although embodiments of the invention have been disclosed, it will be apparent that modifications may be made by one skilled in the art without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

1...Engine, 3...Cylinder block, 3A...Side wall, 4...Oil pan, 4A...Oil reservoir chamber, 19...Blow-by gas chamber, 20...Oil drop passage, 22...Oil outlet hole, 23...Inner wall, 24...Crank chamber, 30...Baffle plate, 31...Bottom wall, 32...Vertical wall, 33...Edge, 34 ...peripheral wall, 35...top wall, 36...oil pit, 37...opening, 38...shielding part

Claims (2)

a cylinder block having a crank chamber;
an oil pan having an oil reservoir chamber and fastened to the bottom of the cylinder block;
a side wall of the cylinder block extending in the crankshaft direction;
a blow-by gas chamber disposed on a side wall of the cylinder block, through which blow-by gas passes;
an oil drop passage that communicates the blow-by gas chamber and the oil pan and returns oil separated from the blow-by gas to the oil reservoir chamber;
An engine comprising: a baffle plate disposed above the oil reservoir chamber;
The cylinder block has an oil outlet hole that opens above the oil reservoir chamber at the lower end of the oil drop passage,
The baffle plate has an edge fastened to the bottom of the cylinder block, and a shielding part provided on the edge and blocking the oil outlet hole,
The shielding part has an oil drop hole through which oil that has fallen through the oil drop passage can pass,
The oil outlet hole is arranged closer to the center of the crank chamber than the edge,
The baffle plate is
a vertical wall bent from the edge and extending downward;
a bottom wall extending from the lower end of the vertical wall to the center side of the crank chamber;
The shielding part is
a top wall with the edge protruding inside the crank chamber along the lower end of the oil drop passage;
An engine comprising : a peripheral wall extending from an outer edge of the top wall to the bottom wall and protruding from the vertical wall into the crank chamber . The baffle plate has an opening for returning oil that has fallen to the upper side of the bottom wall to the oil reservoir chamber,
The engine according to claim 1 , wherein the opening is located at a position that does not face the shield in a direction intersecting the crankshaft direction .

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