JP2006070833A - Breather device for v-type engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote gas liquid separation of blow-by gas by improving a structure of a breather chamber formed in a V-bank of a V-type engine. <P>SOLUTION: An attachment flange is provided on an edge of a cover member blocking an outside breather chamber formed in the V-bank of the V-type engine. A vertical wall part extending toward a crank chamber along the attachment flange is blocked by a plate member. AN inside breather chamber is provided between the plate member and the cover member. A blow-by gas introducing hole 42 taking blow-by gas into the inside breather chamber and an oil drop hole 44 returning oil separated in the inside breather chamber to the crank chamber are provided in the plate member. A box shape inside cover member provided in the inside breather chamber is attached on a top surface of the plate member and a box shape outside cover member 48 provided in the outside breather chamber is attached on a bottom surface of the plate member. The blow-by gas introducing hole is covered by the inside cover member 46 and the outside cover member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a breather apparatus for a V-type engine, and more particularly to a breather apparatus for a V-type engine that improves the structure of a breather chamber formed between V-banks of a V-type engine and promotes gas-liquid separation of blow-by gas. is there.

  As a vehicle engine, there are an engine in which a plurality of cylinders are arranged in series, an engine in which the cylinders are arranged to face each other, a V-type engine in which a plurality of cylinders are arranged in a V shape, and the like.

JP 05-272325 A Japanese Utility Model Publication No. 59-100910 Japanese Utility Model Publication No. 60-55714 Japanese Utility Model Publication No. 61-97514

  By the way, in a conventional breather device for a V-type engine, a technique for forming a breather chamber between V banks of the V-type engine is known (see Patent Documents 3 and 4).

  In these V-type engines, an opening for communicating between the breather chamber and the crank chamber is formed on the bottom surface of the breather chamber, but there is a problem that oil scattered by rotation of the crankshaft easily enters the breather chamber. is there.

  In order to solve this problem, a technique is disclosed in which a protrusion is provided at the opening on the bottom surface of the breather chamber to prevent oil from entering (see Patent Document 1).

  However, in the thing of the patent document 1 mentioned above, although the penetration | invasion of oil can be prevented, since an opening part is covered with a rib, the substantial opening area of an opening part becomes narrow and it becomes difficult to introduce blow-by gas. At the same time, there is an inconvenience that oil leakage from the opening is worsened.

  In addition, when the distance between the opening and the rib is not sufficient, there is a disadvantage that oil accumulates between the opening and the rib, thereby substantially closing the opening.

  Therefore, in order to eliminate the above-mentioned inconvenience, the present invention forms an outer breather chamber between the V banks of the V-type engine, and provides a mounting flange on the edge of the lid member that closes the outer breather chamber. A vertical wall portion extending in the direction of the crank chamber is provided, the vertical wall portion is closed with a plate member, an inner breather chamber is provided between the plate member and the lid member, and blow-by gas is taken into the inner breather chamber. A blow-by gas introduction hole and an oil drop hole for returning the oil separated in the inner breather chamber to the crank chamber are provided in the plate member, and a box-shaped inner cover member disposed in the inner breather chamber is attached to the upper surface of the plate member. In addition, a box-shaped outer cover member disposed in the outer breather chamber is attached to the lower surface of the plate member, and the blow-by gas introduction hole is disposed on the inner side. And characterized in that is covered with the bar member and the outer cover member.

  As described above in detail, according to the present invention, the outer breather chamber is formed between the V banks of the V-type engine, the mounting flange is provided on the edge of the lid member that closes the outer breather chamber, and the crank is formed along the mounting flange. A vertical wall portion extending in the chamber direction, the vertical wall portion is closed with a plate member, an inner breather chamber is provided between the plate member and the lid member, and a blow-by gas introduction hole for introducing blow-by gas into the inner breather chamber; An oil drop hole for returning the oil separated in the inner breather chamber to the crank chamber is provided in the plate member, a box-shaped inner cover member disposed in the inner breather chamber is attached to the upper surface of the plate member, and the lower surface of the plate member A box-shaped outer cover member disposed in the outer breather chamber is attached to the inner cover member and the outer cover member. With this configuration, the outer cover member that covers the blow-by gas introduction hole can prevent the oil scattered in the outer breather chamber from being introduced into the inner breather chamber as much as possible and covers the blow-by gas introduction hole. The gas-liquid separation of the blow-by gas introduced from the blow-by gas introduction hole by the inner cover member can be promoted.

  By inventing as described above, a box-shaped inner cover member disposed in the inner breather chamber is attached to the upper surface of the plate member, and a box-shaped outer cover member disposed in the outer breather chamber on the lower surface of the plate member. The blow-by gas introduction hole is covered with the inner cover member and the outer cover member, and it is possible for oil scattered in the outer breather chamber to be introduced into the inner breather chamber by the outer cover member covering the blow-by gas introduction hole. In addition, the inner cover member that covers the blow-by gas introduction hole promotes gas-liquid separation of the blow-by gas introduced from the blow-by gas introduction hole.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  1 to 15 show an embodiment of the present invention. 4 and 5, reference numeral 2 denotes a 6-cylinder V-type engine.

  The V-type engine 2 is provided with the primary side and secondary side cylinder heads 10 and 12 mounted on the primary side and secondary side cylinder banks 6 and 8 of the upper part of the cylinder block 4, respectively. A bearing cap 16 is connected to the lower surface of the crankcase 14 and an oil pan 18 is attached.

  A crankshaft (not shown) is pivotally supported between the crankcase 14 and the bearing cap 16.

  As shown in FIGS. 5 to 11, primary cylinders 20, 20, and 20 are formed in the primary cylinder bank 6 in the longitudinal direction of the cylinder block 4. In the secondary cylinder bank 8, secondary cylinders 22, 22, 22 are formed in the longitudinal direction of the cylinder block 4.

  The crankcase 14 has a crank chamber 24 formed therein.

  At this time, the breather device 26 is provided in the V-type engine 2 so that the gas in the crank chamber 24 flows to the primary cylinder head 10 side and the secondary cylinder head 12 side.

  The breather device 26 has an outer breather chamber 28 having a relatively large space in the cylinder block 4 between the V banks of the V-type engine 2, that is, between the primary side cylinder bank 6 and the secondary side cylinder bank 8. . The outer breather chamber 28 is disposed in a dead space between the primary side cylinder bank 6 and the secondary side cylinder bank 8 so as not to interfere with a cooling water passage (not shown).

  Further, the crank chamber 24 and the outer breather chamber 28 are formed in a block breather passage (not shown), which is a breather passage having a small opening area formed in the cylinder block 4 in the vertical direction, and a communication hole 30 (see FIG. 12).

  A mounting flange 34 is provided at the edge of the lid member 32 that closes the outer breather chamber 28 formed between the V banks of the V-type engine 2, that is, between the primary side cylinder bank 6 and the secondary side cylinder bank 8. A vertical wall portion 36 extending in the direction of the crank chamber 24 along the flange 34 is provided, the vertical wall portion 36 is closed with a plate member 38, and an inner breather chamber 40 is provided between the plate member 38 and the lid member 32. The plate member 38 is provided with a blow-by gas introduction hole 42 for introducing blow-by gas into the inner breather chamber 40 and an oil drop hole 44 for returning the oil separated in the inner breather chamber 40 to the crank chamber 24. A box-shaped inner cover member 46 disposed in the inner breather chamber 40 is attached to the lower surface of the plate member 38. Attaching a box outer cover member 48 of the shape which is disposed outside the breather chamber 28, a configuration which covers the blow-by gas introduction hole 42 in the inner cover member 46 and the outer cover member 48.

  More specifically, as shown in FIG. 15, the length of the vertical wall portion 36 provided at the edge of the lid member 32 is continuously changed in the crankshaft direction and disposed on the outlet side of the inner cover member 46. Since the vertical wall portion 36 is formed to be long and the oil drop hole 44 is provided in the vicinity of the vertical wall portion 36, the V-type engine 2 is disposed so as to be inclined so that the rear side is lowered. However, as shown in FIG. 12, the oil dropping hole 44 is disposed so as to be located at the lowest portion of the inner breather chamber 40.

  Further, as shown in FIGS. 1 to 3 and 12, the outer cover member 48 is provided with an outer opening 50 that opens to the width direction side of the plate member 38, and the inner cover member 46 has a plate member 38. An inner opening 52 that opens to one side of the longitudinal direction, for example, the oil dropping hole 44 side, is provided, and the opening direction of the outer opening 50 of the outer cover member 48 and the opening direction of the inner opening 52 of the inner cover member 46 are provided. And so as to intersect.

  Furthermore, the inner opening 52 of the inner cover member 46 is provided to face the vertical wall 36 of the inner breather chamber 40 as shown in FIG.

  Furthermore, as shown in FIGS. 2, 3, and 12, the oil dropping hole 44 is provided with an inner opening 52 of the inner cover member 46 and a vertical wall of the inner breather chamber 40 facing the inner opening 52. The blow-by gas introduction hole 42 is provided between the inner breather chamber 40 and the oil breathing hole 44 on the opposite side to the oil dropping hole 44, that is, as shown in FIGS. The wall portion 36 is formed at a position separated from the oil dropping hole 44.

  Reference numeral 54 denotes a position of the lid member 32 that is separated from the internal opening 52 with respect to the formation position (right side in FIG. 12) of the internal opening 52 formed in the inner cover member 46 of the plate member 38. A blow-by gas outlet hole 56 formed on the side (left side in FIG. 12) is formed in the plate member 38 so as to escape a bolt boss (not shown) when the vertical wall portion 36 of the lid member 32 is closed with the plate member 38. It is an escape part.

  Next, the operation will be described.

  When the inner breather chamber 40 is formed in the outer breather chamber 28 formed between the V banks of the V-type engine 2, that is, between the primary side cylinder bank 6 and the secondary side cylinder bank 8, as shown in FIG. The member 38 and the lid member 32 are sequentially attached, the vertical wall portion 36 extending in the direction of the crank chamber 24 along the attachment flange 34 of the lid member 32 is closed by the plate member 38, and the plate member 38, the vertical member 36, An inner breather chamber 40 is provided between them.

  The blow-by gas that has reached the outer breather chamber 28 through the block breather passage and the communication hole 30 that is a breather passage having a small opening area formed in the cylinder block 4 from the crank chamber 24 is indicated by a thick arrow in FIG. As shown, the outer cover member 48 provided in the plate member 38 reaches the inner cover member 46 from the outer opening 50 through the blow-by gas introduction hole 42, and the inner breather chamber 40 extends from the inner opening 52 of the inner cover member 46. Introduced in.

  In addition, after the blow-by gas introduced into the inner breather chamber 40 is gas-liquid separated, the oil is discharged from the oil dropping hole 44 and the blow-by gas after the gas-liquid separation is discharged from the blow-by gas outlet hole 54. The

  Thus, the mounting flange 34 is provided at the edge of the lid member 32 that closes the outer breather chamber 28 formed between the V banks of the V-type engine 2, that is, between the primary side cylinder bank 6 and the secondary side cylinder bank 8. A vertical wall portion 36 extending in the direction of the crank chamber 24 along the mounting flange 34 is provided, the vertical wall portion 36 is closed by a plate member 38, and the inner breather chamber 40 is formed between the plate member 38 and the lid member 32. The plate member 38 is provided with a blow-by gas introduction hole 42 for introducing blow-by gas into the inner breather chamber 40 and an oil dropping hole 44 for returning the oil separated in the inner breather chamber 40 to the crank chamber 24. A box-shaped inner cover member 46 disposed in the inner breather chamber 40 is attached to the upper surface, and the lower surface of the plate member 38 is attached. A box-shaped outer cover member 48 disposed in the outer breather chamber 28 is attached, and the blow-by gas introduction hole 42 is covered with the inner cover member 46 and the outer cover member 48 so that the blow-by gas introduction hole 42 is covered. The cover member 48 can prevent the oil scattered in the outer breather chamber 28 from being introduced into the inner breather chamber 40 as much as possible, and the inner cover member 46 covering the blow-by gas introduction hole 42 can prevent the blow-by gas. Gas-liquid separation of blow-by gas introduced from the introduction hole 42 can be promoted, which is practically advantageous.

  Further, the length of the vertical wall portion 36 provided at the edge of the lid member 32 is continuously changed in the crankshaft direction, and is arranged so as to be inclined in the crankshaft direction when the plate member 38 is attached to the vertical wall portion 36. The oil separation hole 44 for returning the oil separated in the inner breather chamber 40 to the crank chamber 24 is provided on the end side of the plate member 38 in the crankshaft direction, so that the oil separated from the blow-by gas in the inner breather chamber 40 is provided. Can be efficiently returned to the crank chamber 24.

  Further, the outer cover member 48 is provided with an outer opening 50 that opens to the width direction side of the plate member 38, and the inner cover member 46 is provided on one side in the longitudinal direction of the plate member 38, for example, the oil dropping hole 44. An inner opening 52 that opens to the side and an opening direction of the outer opening 50 of the outer cover member 48 and an opening direction of the inner opening 52 of the inner cover member 46 are provided so as to intersect with each other. The blow-by gas introduced from the blow-by gas introduction hole 42 is changed by changing the inflow direction of the blow-by gas taken in from the outer opening 50 of 48 and the out-flow direction of the blow-by gas flowing out from the inner opening 52 of the inner cover member 46. Can be made to collide with the inner side surface portion of the inner cover member 46 to further promote the gas-liquid separation of the blow-by gas.

  Furthermore, by providing the inner opening 52 of the inner cover member 46 so as to oppose the vertical wall portion 36 of the inner breather chamber 40, blow-by gas flowing into the inner breather chamber 40 from the blow-by gas introduction hole 42 can be reduced. Furthermore, it can collide with the vertical wall part 36 of the cover member 32, and can further promote the gas-liquid separation of blow-by gas.

  The oil drop hole 44 is provided between the inner opening 52 of the inner cover member 46 and the vertical wall 36 of the inner breather chamber 40 facing the inner opening 52, and the blow-by gas introduction hole 42. Is formed at a position opposite to the oil drop hole 44 in the crankshaft direction, that is, at a position separated from the oil drop hole 44 with respect to the vertical wall portion 36 of the inner breather chamber 40. Since the portion 52 and the blow-by gas lead-out hole 54 are spaced apart, the blow-by gas that has flowed into the inner breather chamber 40 from the inner opening 52 is diffused throughout the inner breather chamber 40 to reduce the flow velocity of the blow-by gas. In addition, gas-liquid separation in the inner breather chamber 40 can be promoted.

  Further, the plate member 38 is provided with a blow-by gas lead-out hole 54, and the blow-by gas lead-out hole 54 is formed in the vicinity of the vertical wall 36 facing the inner opening 52 of the inner cover member 46. As a result, the blow-by gas outlet hole 54 can be separated from the inner opening 52, and the gas-liquid separation of the blow-by gas that cannot be separated by the inner cover member 46 can be promoted.

  The present invention is not limited to the above-described embodiments, and various application modifications are possible.

  For example, in the embodiment of the present invention, the plate member is provided with a blowby gas introduction hole for introducing blowby gas into the inner breather chamber and an oil drop hole for returning the oil separated in the inner breather chamber to the crank chamber. A box-shaped inner cover member disposed in the inner breather chamber is mounted on the upper surface of the member, and a box-shaped outer cover member disposed in the outer breather chamber is mounted on the lower surface of the plate member, and the blow-by gas introduction hole is disposed on the inner side. Although it was set as the structure covered with a cover member and an outer side cover member, it can also be set as the special structure which uses an L-shaped tube instead of an inner side cover member or an outer side cover member.

  That is, a tubular member curved in an L shape is attached to the upper and lower surfaces of the plate member.

  Then, the L-shaped tube that functions as the inner cover member and the outer cover member can be made into one type of member, the types of components can be reduced, and it can contribute to simplification of parts management and cost reduction. When installing L-shaped tubes on the upper and lower surfaces of the plate member, it is possible to arbitrarily set the opening direction of the L-shaped tube, preventing the introduction of scattered oil and promoting the gas-liquid separation of blow-by gas. An L-shaped tube can be installed in consideration.

  In the embodiment of the present invention, the height position of both end portions in the longitudinal direction of the planar plate member is made different from the horizontal plane, and an oil dropping hole is provided at one end portion where the height position is small. However, it is possible to adopt a special configuration in which the shape of the plate member is deformed in order to efficiently remove the oil.

  That is, when the blow-by gas introduction hole is formed near the central portion of the plate member, the plate member is bent or curved so that the height position where the blow-by gas introduction hole is formed is minimized. Is.

  Then, a plurality of oil dropping holes are provided in a slope portion from the position of the blow-by gas introduction hole formed in the plate member toward the inner opening of the inner cover member, so that the flow of the blow-by gas is not inhibited by the oil.

  In other words, the blowby gas introduction hole formed in the plate member has the smallest height position, and a plurality of oil drop holes are provided on the inclined surface toward the inner opening of the inner cover member, thereby providing a blowby gas. The oil after the gas-liquid separation can be efficiently dropped to the outer breather chamber side, which is practically advantageous.

  Furthermore, in the embodiment of the present invention, a plate-shaped plate member is used. However, a special configuration in which the plate member is deformed into a V-shaped cross section or a U-shaped cross section is also possible.

  Then, the oil after the gas-liquid separation of the blow-by gas can be guided to the oil dropping hole by the plate member deformed to have a V-shaped cross section or a U-shaped cross section.

It is sectional drawing of the plate member by the II line | wire of FIG. 3 which shows the Example of this invention. It is a top view of a plate member. It is a bottom view of a plate member. It is a schematic diagram of an engine. It is sectional drawing by the IV-IV line of FIG. It is a schematic sectional drawing of the cylinder block of an engine. It is a top view of the cylinder block of an engine. It is a bottom view of the cylinder block of an engine. It is a perspective view of a cylinder block of an engine in the state where a lid member was attached. It is a perspective view of a cylinder block of an engine in the state where a lid member was removed and a plate member was attached. It is a perspective view of a cylinder block of an engine in the state where a lid member and a plate member were removed. It is a general | schematic expanded sectional view by the XII-XII line | wire of FIG. It is a bottom view of a lid member. It is a top view of a lid member. It is sectional drawing by the XIV-XIV line | wire of FIG.

Explanation of symbols

2 V-type engine 6 Primary side cylinder bank 8 Secondary side cylinder bank 10 Primary side cylinder head 12 Secondary side cylinder head 14 Crankcase 18 Oil pan 20 Primary side cylinder 22 Secondary side cylinder 24 Crank chamber 26 Breather device 28 Outer breather Chamber 30 Communication hole 32 Lid member 34 Mounting flange 36 Vertical wall portion 38 Plate member 40 Inner breather chamber 42 Blow-by gas introduction hole 44 Oil drop hole 46 Inner cover member 48 Outer cover member 50 Outer opening portion 52 Inner opening portion 54 Blow-by gas derivation Hole 56 relief

Claims (6)

  An outer breather chamber is formed between the V banks of the V-type engine, a mounting flange is provided at the edge of the lid member closing the outer breather chamber, and a vertical wall portion extending in the direction of the crank chamber along the mounting flange is provided. The vertical wall is closed with a plate member, an inner breather chamber is provided between the plate member and the lid member, and the blow-by gas introduction hole for taking the blow-by gas into the inner breather chamber and the oil separated in the inner breather chamber are supplied. An oil drop hole for returning to the crank chamber is provided in the plate member, and a box-shaped inner cover member disposed in the inner breather chamber is attached to the upper surface of the plate member, and disposed in the outer breather chamber on the lower surface of the plate member. A box-shaped outer cover member is attached and the blow-by gas introduction hole is covered with the inner cover member and the outer cover member. Breather device for a V-type engine according to symptoms.   The length of the vertical wall portion is continuously changed in the crankshaft direction, and is disposed so as to be inclined in the crankshaft direction when the plate member is attached to the vertical wall portion, and the oil separated in the inner breather chamber is supplied to the crank chamber. 2. The breather device for a V-type engine according to claim 1, wherein an oil dropping hole for returning to the rear side is provided on an end side in a crankshaft direction of a plate member located on an inclined side.   An outer opening is opened in the outer cover member, an inner opening is opened in the inner cover member, and an opening direction of the outer opening of the outer cover member intersects an opening direction of the inner opening of the inner cover member. The breather device for a V-type engine according to claim 1, wherein the breather device is provided in the V-type engine.   The breather device for a V-type engine according to claim 3, wherein an inner opening of the inner cover member is provided to face a vertical wall portion of the inner breather chamber.   An oil drop hole is provided between the inner opening of the inner cover member and the vertical wall portion facing the inner opening, and a blow-by gas introduction hole is provided in the vicinity of the longest portion of the vertical wall portion. The breather apparatus for a V-type engine according to claim 4.   The blow-by gas lead-out hole is provided in the plate member, and the blow-by gas lead-out hole is formed in the vicinity of the vertical wall portion facing the inner opening of the cover member. A breather device for the V-type engine as described.

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