JP6468594B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine configured to recirculate blowby gas to an intake passage.

  In Japanese Patent No. 4440962 (Patent Document 1), a gas-liquid separation chamber is configured using a mating surface of a cylinder block and a cylinder head, and oil contained in blow-by gas is separated in the gas-liquid separation chamber. An internal combustion engine configured as described above is described. Since the internal combustion engine does not require a dedicated part for configuring the gas-liquid separation chamber, the number of parts and assembly man-hours can be reduced. In addition, since the overall height of the internal combustion engine can be kept low as compared with the configuration in which the gas-liquid separation chamber is provided in the rocker cover, the mountability to the vehicle is also improved.

Japanese Patent No. 4490662

  However, since the internal combustion engine described above is configured to perform gas-liquid separation by flowing the blow-by gas into the gas-liquid separation chamber by the negative pressure on the intake side where the blow-by gas is recirculated and flowing the labyrinth-shaped passage, In order to reliably separate the oil from the gas, a relatively large capacity gas-liquid separation chamber is required, and there is still room for improvement in this respect.

  The present invention has been made in view of the above, and an object of the present invention is to provide a technique capable of ensuring sufficient gas-liquid separation performance while suppressing an increase in size of an internal combustion engine.

  The internal combustion engine of the present invention employs the following means in order to achieve the above-described object.

According to the preferable form of the internal combustion engine which concerns on this invention, the internal combustion engine comprised so that blowby gas may recirculate | reflux to an intake route is comprised. The internal combustion engine includes a crankshaft, a camshaft, a transmission member, an engine block, and a cover member. The transmission member is configured to be wound around the crankshaft and the camshaft and transmit the rotation of the crankshaft to the camshaft. The engine block is configured to rotatably support the crankshaft and the camshaft. The cover member is fastened to the engine block so as to cover the transmission member. When the cover member is fastened to the engine block, a storage chamber for storing the transmission member and a gas-liquid separation chamber are configured. The gas-liquid separation chamber is disposed adjacent to the storage chamber on the side where the transmission member is in the upward direction from the crankshaft side to the camshaft side, and includes a blowby gas inlet, a cross wall, and a blowby gas outlet And it is comprised so that it may have. The blow-by gas introduction port is configured to communicate with the accommodation chamber. The intersecting wall portion is disposed so as to face the transmission member, and is configured so that one end thereof is directed to the blow-by gas inlet and extends in a direction intersecting the tangential direction of the transmission member. The blow-by gas discharge port is configured to communicate with the intake path.

Here, the “engine block” in the present invention typically corresponds to a cylinder head, a cylinder block, and an upper oil pan. In addition, as an aspect of “configured toward the blow-by gas inlet” in the present invention, typically, an aspect in which the blow-by gas inlet is configured by one end of the intersecting wall portion corresponds to this. The aspect suitably comprised so that the end of a part may go to the blowby gas inlet provided independently of the end of the said cross wall part is included. The “transmission member” in the present invention typically corresponds to a chain, but preferably includes a belt. Furthermore, the “tangential direction” in the present invention preferably includes a direction substantially along the tangential direction of the transmission member.

  According to the present embodiment, the blow-by gas flowing toward the tangential direction of the transmission member as the transmission member rotates is collided with the intersecting wall portion, and the oil component contained in the blow-by gas is effectively separated from the blow-by gas. In addition, blowby gas can be introduced from the blowby gas inlet. That is, since the oil component is effectively separated before the blow-by gas is introduced into the gas-liquid separation chamber, the capacity of the gas-liquid separation chamber is larger than the configuration in which the oil component is separated only in the gas-liquid separation chamber. It can be kept small. Further, since the gas-liquid separation chamber is formed by fastening the cover member to the engine block, the overall height of the internal combustion engine can be kept lower than the configuration in which the gas-liquid separation chamber is provided in the rocker cover. As a result, sufficient gas-liquid separation performance can be ensured while suppressing an increase in size of the internal combustion engine.

  According to the further form of the internal combustion engine according to the present invention, the gas-liquid separation chamber is partitioned from the storage chamber by a partition wall portion integrally formed on at least one of the engine block and the cover member so as to extend in the upward direction. It is configured to be. The partition wall portion is configured such that the distance from the transmission member gradually decreases from the lower side in the upward direction toward the upper side. The blow-by gas inlet is disposed at the upper end in the upward direction of the partition wall.

  According to this embodiment, it is possible to increase the flow velocity of the blowby gas that flows between the partition wall portion and the transmission member and flows out in the tangential direction of the transmission member, and the blowby gas collides with the intersecting wall portion with a large kinetic energy. Therefore, the gas-liquid separation action due to the collision can be improved. The blow-by gas from which the oil component has been effectively separated can be introduced into the gas-liquid separation chamber from the blow-by gas inlet.

  According to the further form of the internal combustion engine which concerns on this invention, the crossing wall part is comprised so that it may extend in the direction orthogonal to the tangential direction of a transmission member.

  According to this embodiment, since blowby gas collides perpendicularly to the intersecting wall portion, the collision energy can be increased as compared with a configuration in which blowby gas collides with the intersecting wall portion in an inclined manner. Thereby, the oil component in blow-by gas can be more effectively separated.

  According to the further form of the internal combustion engine which concerns on this invention, the cross | intersection wall part is comprised so that a gas-liquid separation chamber and a storage chamber may be divided. And the blow-by gas introduction port is comprised by the one end part of an intersection wall part, and the upper side edge part of a partition wall part.

  According to this form, it can be set as the structure which blow-by gas from which the oil component was isolate | separated by colliding with an intersection wall part is easy to be introduce | transduced in a gas-liquid separation chamber.

  According to the further form of the internal combustion engine which concerns on this invention, an intersection wall part is comprised so that an end part may be arrange | positioned on the opposite side to the side by which the transmission member was arrange | positioned regarding a partition wall part. And the one end part of the said intersection wall part and the upper side edge part of a partition wall part are comprised so that it may overlap in an up direction.

  According to this form, the collection rate of blow-by gas after colliding with an intersection wall part can be improved. Further, since the oil separated from the blow-by gas by colliding with the intersecting wall portion and transmitted through the intersecting wall portion can be collected in the gas-liquid separation chamber, the separated oil is mixed with the blow-by gas again in the containing chamber. Can be prevented.

  According to the further form of the internal combustion engine which concerns on this invention, the blow-by gas discharge port is arrange | positioned above the blow-by gas introduction port.

  According to this embodiment, since the oil component is separated by its own weight until the blow-by gas reaches from the blow-by gas introduction port to the blow-by gas discharge port, the gas-liquid separation action can be further improved.

  According to the further form of the internal combustion engine which concerns on this invention, the oil pan which can store oil is further provided. In addition, the gas-liquid separation chamber has an oil collecting portion that collects an oil component separated from the blow-by gas introduced into the gas-liquid separation chamber at a lower portion in the upward direction. The engine block is configured to have an oil return passage section that returns the oil collected by the oil collection section to the oil pan.

  According to this embodiment, since the oil collected in the oil collecting part is returned to the oil pan through the oil return passage part isolated from the containing chamber, the separated oil is mixed with the blow-by gas again in the containing room. Can be prevented.

  According to the further form of the internal combustion engine which concerns on this invention, the oil pan has the oil discharge channel | path part connected to an oil return channel | path part. The oil discharge passage portion is configured so as to be immersed in the oil when the oil is stored in the oil pan.

  According to this form, when returning the oil component isolate | separated from blow-by gas to an oil pan, the foaming which arises by colliding with the oil stored in the oil pan can be suppressed. Moreover, it is possible to prevent the blow-by gas in the oil pan from flowing backward from the oil discharge passage portion into the gas-liquid separation chamber through the oil return passage portion.

  According to the further form of the internal combustion engine which concerns on this invention, an engine block is a cylinder head comprised so that the camshaft may be rotatably supported, and a cylinder block comprised so that a crankshaft may be supported rotatably. And. The intersecting wall portion is integrally formed with at least one of the cylinder head and the cover member. And the partition wall part is integrally formed ranging from a cylinder block to a cylinder head.

  According to this embodiment, since the gas-liquid separation chamber can be configured from the cylinder block to the cylinder head, the gas-liquid separation chamber can be configured with a relatively large capacity while suppressing an increase in the size of the internal combustion engine. .

  According to the further form of the internal combustion engine which concerns on this invention, the oil pan which can store oil is further provided. The engine block is configured to have an oil return passage portion that returns the oil component separated from the blow-by gas introduced into the gas-liquid separation chamber to the oil pan.

  According to this embodiment, since the oil component separated from the blow-by gas is returned to the oil pan through the oil return passage portion isolated from the storage chamber, the separated oil is mixed with the blow-by gas again in the storage chamber. This can be prevented.

  According to the further form of the internal combustion engine which concerns on this invention, the oil pan has the oil discharge channel | path part connected to an oil return channel | path part. The oil discharge passage portion is configured to be immersed in the oil when the oil is stored in the oil pan.

  According to this form, when returning the oil component isolate | separated from blow-by gas to an oil pan, the foaming which arises by colliding with the oil stored in the oil pan can be suppressed. Moreover, it is possible to prevent the blow-by gas in the oil pan from flowing backward from the oil discharge passage portion into the gas-liquid separation chamber through the oil return passage portion.

  According to the further form of the internal combustion engine which concerns on this invention, the oil level gauge which has a measurement part for measuring the oil quantity of the oil stored by the oil pan is further provided. And the oil level gauge guide part which guides an oil level gauge is comprised by the gas-liquid separation chamber and the oil return channel | path part so that a measurement part may be immersed in the oil stored by the oil pan.

  According to this embodiment, since the gas-liquid separation chamber and the oil return passage are used as the oil level gauge guide, it is not necessary to provide a dedicated oil level gauge guide. Thereby, the internal combustion engine can be made compact.

  According to the further form of the internal combustion engine which concerns on this invention, an engine block is a cylinder head comprised so that the camshaft may be rotatably supported, and a cylinder block comprised so that a crankshaft may be supported rotatably. And. The intersecting wall portion is integrally formed with at least one of the cylinder head and the cover member. Furthermore, the partition wall is configured to have a length from the oil pan to the cylinder head. The oil return passage portion and the oil discharge passage portion are configured using a partition wall portion.

  According to this embodiment, since the oil return passage portion and the oil discharge passage portion are configured using the partition wall portion, the oil return passage portion and the oil discharge passage portion can be easily secured.

  According to the further form of the internal combustion engine which concerns on this invention, it is further provided with the head cover comprised so that a part of storage chamber might be formed by being attached to the upper part of a cylinder head. The head cover is configured to have an insertion opening and an insertion passage for inserting the oil level gauge into the oil level gauge guide portion. The insertion opening is provided at such a height that the oil component separated from the blow-by gas is not blown out from the insertion opening even by the pressure difference between the pressure in the gas-liquid separation chamber and the atmospheric pressure.

  According to this embodiment, even if the oil level gauge is forgotten to be attached, it is possible to satisfactorily suppress the oil component from being ejected from the insertion opening.

  According to the further form of the internal combustion engine which concerns on this invention, when the internal combustion engine is mounted in a vehicle, the insertion opening is comprised so that it may open in the direction used as the front of the said vehicle.

  According to this embodiment, the oil level gauge can be easily inserted and removed even when the internal combustion engine is mounted on the vehicle.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can ensure sufficient gas-liquid separation performance can be provided, suppressing the enlargement of an internal combustion engine.

1 is an exploded perspective view showing an outline of a configuration of an internal combustion engine 1 according to an embodiment of the present invention. 3 is a perspective view of a cylinder head 4. FIG. It is the front view which looked at the cylinder head 4 from the front wall part 4a side. 3 is a perspective view of a cylinder block 8. FIG. It is the top view which looked at the cylinder block 8 from upper direction. It is the front view which looked at the cylinder block 8 from the front wall part 8a side. It is sectional drawing which shows the AA cross section of FIG. 2 is a state diagram showing a state in which a cylinder head 4 is fastened to a cylinder block 8. FIG. 1 is a perspective view of an upper oil pan 10. FIG. It is the top view which looked at the upper oil pan 10 from upper direction. It is sectional drawing which shows the BB cross section of FIG. 2 is a front view of a front cover 18. FIG. FIG. 4 is a back view seen from the back side of the front cover 18. It is explanatory drawing which shows the mode of gas-liquid separation. FIG. 15 is a cross-sectional view showing a DD cross section when a front cover 18 is fastened to the cylinder head 4, the cylinder block 8, and the upper oil pan 10 in FIG. 14. It is explanatory drawing which shows a mode that the oil component isolate | separated from blow-by gas is returned to an oil pan. It is the front view which looked at the cylinder head 104 of the modification from the front wall part 4a side. It is explanatory drawing which shows a mode that the gas-liquid separation chamber 90 and the chain chamber CHR were comprised using the cylinder head 204 and the front cover 218 of the modification. It is explanatory drawing which shows a mode that the gas-liquid separation chamber 90 and the chain chamber CHR were comprised using the cylinder head 304 and the front cover 318 of the modification. It is explanatory drawing which shows a mode that the gas-liquid separation chamber 90 and the chain chamber CHR were comprised using the cylinder head 404 and the front cover 418 of the modification. It is a perspective view which shows the outline of a structure of the internal combustion engine 500 of a modification. FIG. 10 is an explanatory view showing a state of an internal combustion engine 500 of a modified example with a front cover 518 removed. It is the reverse view which looked at the front cover 518 from the back side. FIG. 5 is an explanatory diagram showing a state in which a front cover 518 is fastened to a cylinder head 504, a cylinder block 508, and an upper oil pan 510. It is sectional drawing which shows the EE cross section of FIG.

  Next, the best mode for carrying out the present invention will be described using examples.

  As shown in FIG. 1, the internal combustion engine 1 according to the first embodiment of the present invention is configured to rotatably support the intake and exhaust camshafts 2a and 2b and the intake and exhaust camshafts 2a and 2b. Cylinder head 4, rocker cover 6 attached to the upper part of cylinder head 4, cylinder block 8 attached to the lower part of cylinder head 4, upper oil pan 10 attached to the lower part of cylinder block 8, upper A lower oil pan 12 attached to a lower portion of the oil pan 10, a crankshaft 14 rotatably supported by the cylinder block 8, and a chain 16 wound around the crankshaft 14 and intake and exhaust camshafts 2a and 2b. Cylinder head 4, cylinder block 8 and A front cover 18 attached to Tsu par oil pan 10, and a.

  The intake and exhaust camshafts 2a and 2b are an example of an implementation configuration corresponding to the “camshaft” in the present invention. The cylinder head 4, the cylinder block 8, and the upper oil pan 10 correspond to the “engine block” in the present invention, and the front cover 18 is an example of an implementation configuration corresponding to the “cover member” in the present invention. In the present embodiment, for the sake of convenience, the rocker cover 6 side, that is, the upper side of the paper surface in FIG. 1 is defined as “upper” or “upper”, and the lower oil pan 12 side, that is, the lower side of the paper surface in FIG. , Defined as “lower” or “lower”.

  The cylinder head 4 is one of the main components constituting the internal combustion engine 1, and is configured in a generally block shape as shown in FIG. The cylinder head 4 includes a front wall portion 4a and a rear wall portion 4b configured to extend in a direction perpendicular to the axial direction of the intake and exhaust camshafts 2a and 2b, and the axial lines of the intake and exhaust camshafts 2a and 2b. It has two side wall parts 4c, 4d configured to extend in a direction parallel to the direction, and a support wall part 4e for rotatably supporting the intake and exhaust camshafts 2a, 2b.

  As shown in FIG. 2, the front wall portion 4 a is configured to have an overhanging portion 4 a ′ that projects outward from the side wall portion 4 c. As shown in FIGS. 2 and 3, mounting flange portions 42 to which the front cover 18 is fastened are integrally formed at both ends of the front wall portion 4a in the width direction (left and right directions in FIGS. 2 and 3). ing.

  The mounting flange portion 42 is configured to project from the front wall portion 4a to the front side in the axial direction of the intake and exhaust camshafts 2a, 2b (the front side in the drawing in FIG. 3). The protruding end of the mounting flange portion 42 constitutes a contact surface that contacts the front cover 18. Moreover, the mounting flange part 42 is comprised so that it may extend in the up-down direction (up-down direction of FIG. 2 and FIG. 3) of the front wall part 4a. Note that the mounting flange portion 42 on the overhanging portion 4a ′ side has a mounting flange portion 42a extending in the vertical direction of the front wall portion 4a (the vertical direction in FIGS. 2 and 3) and an upper end portion of the front wall portion 4a. And a mounting flange portion 42b that is connected so as to be orthogonal to the mounting flange portion 42a, and is configured in a substantially inverted L shape in a front view.

  As shown in FIG. 3, an accommodating portion 44 that can accommodate the chain 16 is formed between the mounting flange portions 42 at both ends in the width direction of the front wall portion 4 a. At the front end of the front wall portion 4a corresponding to the overhanging portion 4a ′, the housing portion 44 is partitioned by two ribs 46a and 46b extending in the vertical direction (vertical direction in FIG. 3). Region 46 is configured. That is, the region 46 is disposed adjacent to the accommodating portion 44 with the two ribs 46a and 46b interposed therebetween.

  As shown in FIG. 2, the rib 46 a is configured to protrude from the front wall portion 4 a to the front side in the axial direction of the intake and exhaust camshafts 2 a and 2 b (the front side in the drawing in FIG. 2 and FIG. 3). The protruding end of the rib 46 a is configured to be flush with the protruding end of the mounting flange portion 42. That is, the protruding end of the rib 46a also constitutes a contact surface with which the front cover 18 contacts.

  Further, as shown in FIG. 3, the rib 46a has an upper end portion extending from a lower end portion 4f (lower side in FIG. 3) of the front wall portion 4a to a substantially central portion in the vertical direction (upward and downward direction in FIG. 3) of the front wall portion 4a. It is comprised so that it may extend toward (upper side of FIG. 3). In detail, the rib 46a is configured to be along a part of the chain 16 on the upward direction side at a position separated from the mounting flange portion 42 on the overhanging portion 4a ′ side by a predetermined distance on the housing portion 44 side. Yes. A predetermined gap is secured between the rib 46a and the chain 16. The rib 46a is an example of the implementation structure corresponding to the "partition wall part" in this invention.

  As shown in FIG. 2, the rib 46b is configured to protrude from the front wall portion 4a to the front side in the axial direction of the intake and exhaust camshafts 2a, 2b (the front side in the drawing in FIG. 2 and FIG. 3). The protruding end of the rib 46 b is configured to be flush with the protruding end of the mounting flange portion 42. That is, the protruding end of the rib 46b also constitutes a contact surface with which the front cover 18 contacts.

  Further, as shown in FIG. 3, the rib 46 b extends from the mounting flange portion 42 b provided at the upper end portion of the front wall portion 4 a to the extending direction of the rib 46 a and the tangential direction of the portion along the rib 46 a of the chain 16. It is comprised so that it may extend in the direction which crosses. In other words, the rib 46b is formed so as to be inclined with respect to the upper end portion of the front wall portion 4a so as to move away from the accommodation portion 44 from the position near the accommodation portion 44 at the upper end portion of the front wall portion 4a toward the tip. Yes. The rib 46b is preferably configured to be orthogonal to the extending direction of the rib 46a and the tangential direction of the portion of the chain 16 along the rib 46a. The rib 46b is an example of the implementation structure corresponding to the "crossing wall part" in this invention.

  Further, as shown in FIG. 3, the rib 46b is configured to be disposed at a position opposite to the accommodating portion 44 with respect to the rib 46a (the projecting end side of the projecting portion 4a ′, the left side in FIG. 3). ing. The tip 46b ′ of the rib 46b (the end opposite to the end connected to the upper end of the front wall 4a) and the upper end 46a ′ of the rib 46a (upper end in FIG. 3) A predetermined gap is formed between them as shown in FIG. An entrance 62 of a gas-liquid separation chamber 90 described later is configured by the predetermined gap.

  The upper end portion 46a ′ of the rib 46a corresponds to the “upper end portion of the partition wall portion” in the present invention, and the tip end portion 46b ′ of the rib 46b corresponds to the “one end portion of the intersecting wall portion” in the present invention. The inlet 62 is an example of an implementation configuration corresponding to the “blow-by gas inlet” in the present invention. Further, the aspect in which the inlet 62 is configured by a predetermined gap between the tip 46b ′ of the rib 46b and the upper end 46a ′ of the rib 46a is “the blow-by gas inlet is one end of the intersecting wall” in the present invention. It is an example of the implementation structure corresponding to the aspect comprised by the upper side edge part of a partition wall part.

  In addition, as shown in FIGS. 2 and 3, a through hole 64 that penetrates to the region 46 is provided on the side surface of the mounting flange portion 42 a on the overhanging portion 4 a ′ side (the surface extending in the protruding direction of the mounting flange portion 42 a). Is formed. The through hole 64 is disposed at a position in the vicinity of the connecting portion between the mounting flange portion 42a and the mounting flange portion 42b in the mounting flange portion 42a.

  Further, the through hole 64 is disposed on the upper side (upper side in FIG. 3) than the entrance 62. As shown in FIG. 1, a PCV valve 70 is attached to the through hole 64 and connected to an intake manifold (not shown) via a pipe (not shown). The through hole 64 is an example of an implementation configuration corresponding to the “blow-by gas discharge port” in the present invention.

  Further, as shown in FIG. 3, the tip end portion 46b ′ of the rib 46b and the upper end portion 46a ′ of the rib 46a are formed in the upward direction of the chain 16 (the vertical direction of the front wall portion 4a, the extension of the ribs 46a and 46b). In the direction). The aspect in which the tip end portion 46b ′ of the rib 46b and the upper end portion 46a ′ of the rib 46a partially overlap in the upward direction of the chain 16 is the “one end portion of the intersecting wall portion” in the present invention. It is an example of the implementation structure corresponding to the aspect which is comprised so that the upper side edge part of a partition wall part may overlap in an up direction.

  Like the cylinder head 4, the cylinder block 8 is a main part constituting the internal combustion engine 1, and is configured in a generally block shape as shown in FIG. The cylinder block 8 extends in a direction parallel to the axial direction of the crankshaft 14 and a front wall portion 8a and a rear wall portion 8b configured to extend in a direction orthogonal to the axial direction of the crankshaft 14. 2 side walls 8c and 8d, a support wall 8e for rotatably supporting the crankshaft 14, and a cylinder bore 82 on which a piston (not shown) slides.

  As shown in FIG. 4, the front wall 8 a has both ends in the width direction (both ends in the left and right direction in FIG. 4) that are orthogonal to both the axial direction of the crankshaft 14 and the axial direction of the cylinder bore 82. It is configured to have overhanging portions 8a ′ and 8a ″ projecting outward from the side walls 8c and 8d.

  As shown in FIGS. 4 and 6, mounting flange portions 84 to which the front cover 18 is fastened are integrally formed at both ends of the front wall portion 8a in the width direction (left and right directions in FIGS. 4 and 6). . The mounting flange portion 84 is configured to protrude from the front wall portion 8a to the front side in the axial direction of the crankshaft 14 (the front side in the drawing in FIGS. 4 and 6). The protruding end of the mounting flange portion 84 constitutes a contact surface that contacts the front cover 18. Further, the mounting flange portion 84 is configured to extend in the vertical direction of the front wall portion 8a (the vertical direction in FIGS. 4 and 6).

  Between the mounting flange portions 84 at both ends in the width direction of the front wall portion 8a, a housing portion 86 capable of housing the chain 16 is formed as shown in FIGS. At the front end of the portion corresponding to the overhanging portion 8a ′ of the front wall portion 8a, a region 88 partitioned from the accommodating portion 86 is configured by a rib 88a extending in the vertical direction (vertical direction in FIG. 6). ing. That is, the region 88 is disposed adjacent to the accommodating portion 86 with 88a interposed therebetween. The region 88 is an example of an implementation configuration corresponding to the “oil collecting unit” in the present invention.

  As shown in FIG. 4, the rib 88 a is configured to protrude from the front wall 8 a to the front side in the axial direction of the crankshaft 14 (front side in the paper surface direction of FIG. 4). The protruding end of the rib 88 a is configured to be flush with the protruding end of the mounting flange portion 84. That is, the protruding end of the rib 88a also constitutes a contact surface with which the front cover 18 contacts.

  As shown in FIG. 6, the rib 88a is configured such that one end is connected to the mounting flange portion 84 and the other end reaches the upper end of the front wall portion 8a. That is, the rib 88a and the mounting flange portion 84 constitute a portion having a substantially V shape in front view and having a region 88 inside. The rib 88a is an example of the implementation structure corresponding to the "partition wall part" in this invention.

  As shown in FIG. 5, the region 88 extends from the protruding end side (lower side in FIG. 5) of the rib 88 a and the mounting flange portion 84 toward the proximal end side (upper side in FIG. 5) of the rib 88 a and the mounting flange portion 84. In the direction perpendicular to the axial direction of the crankshaft 14 toward the cylinder bore 82 side (right side in FIG. 5) at the back (upper end in FIG. 5). It is bent. That is, the region 88 is configured to cut into the base end of the rib 88a at the back.

  Further, as shown in FIG. 7, the cylinder block 8 is formed with a through hole 89 that penetrates from the lower end 8 f to the region 88. As shown in FIG. 5, the opening on the region 88 side of the through hole 89 is arranged at a portion cut into the base end of the rib 88 a at the back of the region 88. The through-hole 89 is an example of an implementation configuration corresponding to the “oil return passage” in the present invention.

  As shown in FIGS. 4 and 6, the overhanging portion 8 a ″ of the front wall portion 8 a constitutes a water pump housing for mounting the water pump.

  Three cylinder bores 82 are arranged in series in the axial direction of the crankshaft 14. The cylinder head 4 and the cylinder block 8 are an example of an implementation configuration corresponding to the “engine block” in the present invention.

  When the cylinder head 4 is fastened to the cylinder block 8 configured in this manner, the rib 88a is connected to the rib 46a of the cylinder head 4 as shown in FIG. The one continuous rib is connected to the chain 16 as it goes from the rib 88a side to the rib 46a side (lower side in the upward direction of the chain 16 (lower side in FIG. 8) to upper side (upper side in FIG. 8)). The interval is configured to decrease gradually. The one continuous rib is an example of an implementation configuration corresponding to the “partition wall” in the present invention.

  The upper oil pan 10 is a part that constitutes a crank chamber together with the cylinder block 8, and is configured in a bowl shape as shown in FIG. The upper oil pan 10 extends in a direction parallel to the axial direction of the crankshaft 14 and a front wall portion 10a and a rear wall portion 10b configured to extend in a direction orthogonal to the axial direction of the crankshaft 14. And two side wall portions 10c and 10d configured as described above.

  As shown in FIG. 10, the front wall portion 10a, the rear wall portion 10b, and the side wall portions 10c and 10d are connected by a baffle plate 10e. A plurality of openings are formed in the baffle plate 10e. A crank chamber CR is constituted by a region surrounded by the front wall portion 10a, the rear wall portion 10b, the side wall portions 10c and 10d, and the baffle plate 10e.

  As shown in FIG. 9, a mounting flange portion 92 to which the front cover 18 is fastened is integrally formed on the front wall portion 10a. The mounting flange portion 92 is configured to protrude from the front wall portion 10a to the front side in the axial direction of the crankshaft 14 (the front side in the drawing in FIG. 9).

  The protruding end of the mounting flange portion 92 constitutes a contact surface that contacts the front cover 18. In addition, the attachment flange part 92 is comprised by the front view substantially U shape. An accommodation portion 94 that can accommodate the chain 16 is formed inside the mounting flange portion 92.

  Further, as shown in FIG. 9, a cutout 96 for communicating the crank chamber CR and the accommodating portion 94 is formed in the front wall portion 10a. The notch 96 has a substantially U shape when viewed from the front.

  Further, in the vicinity of the connection portion between the front wall portion 10a and the side wall portion 10c of the upper oil pan 10, as shown in FIGS. 9 to 11, a through hole 52 penetrating in the vertical direction (vertical direction in FIG. 11) is formed. Has been. As shown in FIG. 16, the through hole 52 is configured to communicate with the through hole 89 when the upper oil pan 10 is fastened to the cylinder block 8.

  The through hole 52 is arranged such that when oil is accumulated in the upper oil pan 10 and the lower oil pan 12, the lower end of the through hole 52 (downward in FIG. 16) is located below the oil level OL of the oil. It is comprised so that. That is, the lower end portion of the through hole 52 is configured to be immersed in oil. The through hole 52 is an example of an implementation configuration corresponding to the “oil discharge passage portion” in the present invention.

  The chain 16 is configured as a transmission member that transmits the rotation of the crankshaft 14 to the intake and exhaust camshafts 2a and 2b. By rotating the intake and exhaust camshafts 2a and 2b through the chain 16, intake and exhaust valves (not shown) are opened and closed to supply fuel and air to a combustion chamber (not shown) and to supply combustion gas. Exhaust from a combustion chamber (not shown).

  As shown in FIG. 12, the front cover 18 has a longitudinal direction in the vertical direction (the vertical direction in FIG. 12), and is configured as a cover member that covers the chain 16. As shown in FIG. 13, the front cover 18 includes mounting flange portions 72 that abut against the mounting flange portions 42, 84, and 92. The attachment flange portions 72 are provided at both ends of the front cover 18 in the width direction (left-right direction in FIG. 13).

  Further, as shown in FIG. 13, the front cover 18 includes a rib 74 configured to come into contact with the protruding end of the rib 46 b of the cylinder head 4, and the protruding end of the rib 46 a of the cylinder head 4 and the cylinder block 8. A rib 76 is formed integrally with the protruding end of the rib 88a. The protruding ends of the ribs 74 and 76 are configured to be flush with the protruding end of the mounting flange portion 72.

  When the front cover 18 is fastened to the cylinder head 4, the cylinder block 8, and the upper oil pan 10, the ribs 74 and 76 abut against the ribs 46a, 46b, and 88a, as shown in FIG. Thereby, the gas-liquid separation chamber 90 for separating the oil component in the blow-by gas is configured. That is, the gas-liquid separation chamber 90 has an upper portion (intake and exhaust camshafts 2a, 2b) in the upward direction of the chain 16, that is, in the direction in which the chain 16 is directed from the crankshaft 14 side to the intake and exhaust camshafts 2a, 2b. (Close position).

  Further, the front cover 18 is fastened to the cylinder head 4, the cylinder block 8, and the upper oil pan 10, so that as shown in FIG. 15, the front cover 18 is interposed between the front cover 18 and the storage portions 44, 86, 94. A chain chamber CHR is configured. The chain chamber CHR is an example of an implementation configuration corresponding to the “accommodating chamber” in the present invention.

  Next, the operation of the internal combustion engine 1 configured as described above, particularly, the operation when the blow-by gas is returned to the intake manifold (not shown) will be described. In the present embodiment, the chain 16 is configured to rotate clockwise in FIG. The blow-by gas leaked into the crank chamber CR from between the cylinder bore 82 and a piston (not shown) with the operation of the internal combustion engine 1 flows into the chain chamber CHR through the notch 96 of the upper oil pan 10. The blow-by gas that has flowed into the chain chamber CHR is directed upward of the internal combustion engine 1 (upward in FIG. 14) by the rotation of the chain 16. This upward flow of blow-by gas is also promoted by the air flow generated by the rotation of the chain 16.

  At this time, a part of the blow-by gas flowing toward the upper side of the chain chamber CHR (the upper side of FIG. 14) rises between the chain 16 and the ribs 88a and 46a along the rotation direction of the chain 16. And it flows out toward the tangential direction of the chain 16 from between the chain 16 and the upper end part 46a 'of the rib 46a.

The blow-by gas that has flowed out toward the tangential direction of the chain 16 collides with the ribs 46b as shown in FIG. Thereby, the oil component contained in blow-by gas is effectively isolate | separated from blow-by gas. When the rib 46 b is configured to be orthogonal to the extending direction of the rib 46 a and the tangential direction of the portion along the rib 46 a of the chain 16, the rib 46 b is extended to the rib 46 a and the rib of the chain 16. Compared to the case where the tangential direction of the portion along 46a intersects with the inclined direction, the collision energy when blow-by gas collides with the rib 46b can be increased. Thereby, the oil component in blow-by gas can be more effectively separated.

  The blow-by gas that has collided with the rib 46 b is introduced into the gas-liquid separation chamber 90 through the inlet 62. Here, since the pressure inside the gas-liquid separation chamber 90 is lower than that of the chain chamber CHR due to the negative pressure from the intake manifold (not shown), the blow-by gas that collides with the rib 46b enters the gas-liquid separation chamber 90. Introduction is promoted.

  The tip 46b ′ of the rib 46b and the upper end 46a ′ of the rib 46a partially overlap in the upward direction of the chain 16 (the vertical direction of the front wall 4a, the extending direction of the ribs 46a and 46b). Thus, the blow-by gas that has collided with the rib 46b can be reliably introduced into the gas-liquid separation chamber 90.

  The blow-by gas thus introduced into the gas-liquid separation chamber 90 bypasses the rib 46b and flows further upward (upward in FIG. 14) and flows into the region 46, and through the through hole 64, the PCV valve 70 and piping (not shown). ) To the intake manifold (not shown).

  Here, since the gas-liquid separation chamber 90 is configured such that the blow-by gas bypasses the rib 46b and flows to the through hole 64 disposed further above the inlet 62 (upward in FIG. 14), The oil component in the blow-by gas that could not be separated due to the collision with the rib 46b can be further separated by its own weight. Thereby, the blow-by gas from which the oil component is sufficiently separated can be recirculated to the intake manifold as the intake system.

  On the other hand, the oil component separated by the collision with the rib 46 b falls down along the rib 46 b and is collected in the region 88. Here, since the rib 46b is configured to be disposed at a position opposite to the accommodating portion 44 with respect to the rib 46a, the oil component transmitted through the rib 46b can be effectively collected in the region 88. The region 88 is an example of an implementation configuration corresponding to the oil collecting unit in the present invention.

  Accordingly, the oil component separated by the collision with the rib 46b can be effectively prevented from falling into the chain chamber CHR, so that the oil component is prevented from being mixed again with the blow-by gas drifting in the chain chamber CHR. Can do.

  Then, the oil collected in the region 88 is returned to the lower oil pan 12 from the through hole 89 through the through hole 52 as shown in FIG. Here, since the lower end portion of the through hole 52 is configured to be immersed in the oil stored in the upper oil pan 10 and the lower oil pan 12, the oil discharged from the through hole 52 is the upper oil pan 10. Since the oil surface OL of the inner oil is not hit, oil foaming can be effectively suppressed. Moreover, it is possible to effectively prevent the blow-by gas from flowing backward through the through hole 52.

  In 1st Embodiment, although it was set as the structure which makes blow-by gas collide with the rib 46b as one of the partition walls which comprise the gas-liquid separation chamber 90, it is not restricted to this. For example, as shown in a modified cylinder head 104 illustrated in FIG. 17, a collision rib 147 is provided separately from the rib 146 b as one of the partition walls constituting the gas-liquid separation chamber 90, and the collision rib 147 is blow-by. It is good also as composition which makes gas collide.

  As shown in FIG. 17, mounting flange portions 142 are integrally formed at both ends in the width direction of the front wall portion 4a of the cylinder head 104, and the chain 16 is accommodated between the mounting flange portions 142 at both ends in the width direction. An accommodating portion 144 is configured. Two ribs 146a and 146b and a collision rib 147 extending in the vertical direction (vertical direction in FIG. 17) are integrally formed at the front end of the front wall portion 4a, and are accommodated by the two ribs 146a and 146b. A region 146 partitioned from the portion 144 is configured at a position adjacent to the accommodating portion 144.

  As shown in FIG. 17, a predetermined gap is formed between the tip end portion 146b 'of the rib 146b and the upper end portion 146a' of the rib 146a. The collision rib 147 is configured to penetrate the gap. The upper end 146a 'of the rib 146a and the collision rib 147 constitute the inlet 162 of the gas-liquid separation chamber 90.

  Here, the tip end portion 147 ′ of the collision rib 147 and the upper end portion 146a ′ of the rib 146a are identical in the upward direction of the chain 16 (the vertical direction of the front wall portion 4a, the extending direction of the ribs 146a and 146b). The parts are configured to overlap.

  In the first embodiment, the tip end portion 46b ′ of the rib 46b and the upper end portion 46a ′ of the rib 46a are in the upward direction of the chain 16 (the vertical direction of the front wall portion 4a, the extending direction of the ribs 46a and 46b). However, it is sufficient that the blow-by gas colliding with the rib 46b can be introduced into the gas-liquid separation chamber 90. The tip 46b 'of the rib 46b and the upper end of the rib 46a may be used. The portion 46a ′ may be configured not to overlap in the upward direction of the chain 16.

  In the first embodiment, the rib 46b is configured to be disposed at a position opposite to the accommodating portion 44 with respect to the rib 46a (the protruding end side of the protruding portion 4a ′, the left side in FIG. 3). Not limited to this. For example, a configuration in which only a part of the rib 46b is disposed at a position on the opposite side to the housing portion 44 with respect to the rib 46a (the projecting end side of the projecting portion 4a ', the left side in FIG. 3).

  In the first embodiment, one continuous rib composed of the rib 88a and the rib 46a is moved from the rib 88a side to the rib 46a side (the lower side in the upward direction of the chain 16 (the lower side in FIG. 8) to the upper side. (Upper side in FIG. 8)), the distance from the chain 16 is gradually reduced as it goes toward the upper side. However, the present invention is not limited to this. For example, although the effect of separating the oil component from the blow-by gas is lower than that of the present embodiment, the single rib may be configured so that the distance between the continuous single rib and the chain 16 does not change. Contrary to the present embodiment, one continuous rib is formed from the rib 88a side to the rib 46a side (the lower side in the upward direction of the chain 16 (the lower side in FIG. 8) to the upper side (the upper side in FIG. 8). The distance from the chain 16 may be gradually increased as it goes to)).

  In the first embodiment, the gas-liquid separation chamber 90 is configured to extend over the cylinder head 4 and the cylinder block 8, but only the cylinder head 4 or only the cylinder block 8 may be configured.

  In the first embodiment, the through hole 52 is configured to be submerged when oil is stored in the upper oil pan 10 and the lower oil pan 12, but the through hole 52 may be configured not to be submerged.

  In the first embodiment, the cylinder head 4 is provided with ribs 46a and 46b, and the front cover 18 is provided with ribs 74 and 76, and the ribs 46a and 46b and the ribs 74 and 76 are brought into contact with each other. Although the separation chamber 90 and the chain chamber CHR are configured, the present invention is not limited to this. For example, as shown in FIG. 18, it is good also as a structure which has a predetermined clearance gap between rib 246a, 246b and rib 274,276.

  As shown in FIG. 19, ribs 346a and 346b are provided only on the cylinder head 304, and the ribs 346a and 346b are configured to have a height reaching the bottom surface 318a of the front cover 318. 90 and the chain chamber CHR may be configured. In this case, the ribs 346a and 346b and the bottom surface 318a of the front cover 318 may be in contact with each other, or a predetermined gap may be provided between them.

  Furthermore, as shown in FIG. 20, ribs 474 and 476 are provided only on the front cover 418, and the ribs 474 and 476 are configured to have a height reaching the front wall portion 404 a of the cylinder head 404. The separation chamber 90 and the chain chamber CHR may be configured. In this case, the ribs 474 and 476 and the front wall portion 404a of the cylinder head 404 may be in contact with each other, or a predetermined gap may be provided between them.

  Next, an internal combustion engine 500 according to a second embodiment of the present invention will be described. The internal combustion engine 500 according to the second embodiment is different in the structure of the gas-liquid separation chamber 590 and the structure for returning the oil component separated from the blow-by gas in the gas-liquid separation chamber 590 to the oil pan, The rocker cover 506 has the same configuration as that of the internal combustion engine 1 according to the first embodiment except that the rocker cover 506 has a configuration having an insertion portion 534 of the oil level gauge 532. Therefore, in order to avoid redundant description, the same reference numerals are given to the same configurations of the internal combustion engine 1 according to the first embodiment among the configurations of the internal combustion engine 1 according to the second embodiment. Detailed description is omitted.

  In the internal combustion engine 500 according to the second embodiment, an oil level gauge 532 for measuring the amount of oil stored in the upper oil pan 10 or the lower oil pan 12 is provided from the rocker cover 506 as shown in FIG. It is configured to be inserted.

  As shown in FIG. 22, the oil level gauge 532 includes a handle portion 532a, a main body portion 532b, and a measurement portion 532c. The main body 532b is made of a flexible material (for example, spring steel).

As shown in FIG. 21, the rocker cover 506 includes an insertion portion 534 for inserting an oil level gauge 532. As shown in FIG. 22, the insertion portion 534 includes an insertion opening 534a as an inlet for inserting an oil level gauge 532, an insertion passage 534b as a passage for the oil level gauge 532, and a connection port to a gas-liquid separation chamber 590 described later. A connection opening 534c.

  As shown in FIGS. 21 and 22, the insertion opening 534a is opened so as to face the side wall portion 4d side of the cylinder head 504 (the flange portion 4d ′ side to which an intake manifold (not shown) is attached). That is, the insertion opening 534a is opened toward the front side of the traveling direction of the vehicle when the internal combustion engine 500 is mounted on the vehicle. Thus, the oil level gauge 532 can be easily inserted and removed even when the internal combustion engine 500 is mounted on the vehicle.

  The insertion opening 534a allows the blow-by gas in the gas-liquid separation chamber 590 and the oil component separated from the blow-by gas to blow out from the insertion opening 534a due to the pressure difference between the pressure in the gas-liquid separation chamber 590 and the atmospheric pressure. It is provided at such a high position. Specifically, for example, in the case of an internal combustion engine in which the pressure in the gas-liquid separation chamber 590 is 1 kpa at the maximum, the height from the tip 46b ′ of the rib 46b of the cylinder head 504 to the insertion opening 534a is 100 mm. It sets so that it may become above.

The cylinder head 504 is basically the same as the cylinder head 4 provided in the internal combustion engine 1 according to the first embodiment, except that a communication opening 543 communicating with the connection opening 534c is formed in the mounting flange portion 542b. It has the same configuration. By attaching the rocker cover 506 to the cylinder head 504, as shown in FIG. 22, the insertion passage 534b of the insertion portion 534 and the gas-liquid separation chamber 590 (region 546) are connected via the connection opening 534c and the communication opening 543. Communicated.

  The cylinder block 508 is basically the internal combustion engine according to the first embodiment except that the rib 588a extends to the lower end portion 508f of the cylinder block 508 without being connected to the mounting flange portion 584. 1 has the same configuration as that of the cylinder block 8 included in 1. That is, in the cylinder block 508, a region 588 configured by the mounting flange portion 584 and the rib 588a instead of the through hole 89 functions as an oil return passage. The protruding end of the rib 588a is configured to be flush with the protruding end of the mounting flange portion 584. The region 588 is an example of an implementation configuration corresponding to the “oil return passage” in the present invention.

  The upper oil pan 510 basically has the same configuration as the upper oil pan 10 provided in the internal combustion engine 1 according to the first embodiment, except that the rib 593 is provided instead of the through hole 52. Yes. As shown in FIG. 22, the rib 593 is erected on the front wall portion 510 a of the upper oil pan 510 so as to be substantially parallel to the mounting flange portion 592. The rib 593 extends from the upper end of the upper oil pan 510 to the lower side of the center in the height direction (vertical direction in FIG. 22).

Specifically, the rib 593 is arranged such that when oil is stored in the upper oil pan 510 and the lower oil pan 512, the lower end of the rib 593 (downward in FIG. 22) is below the oil level OL of the oil. It is configured to be as long as possible. That is, the lower end portion (the lower portion in FIG. 22) of the rib 593 is configured to be immersed in oil. The protruding end of the rib 593 is configured to be flush with the protruding end of the mounting flange portion 592. A region 595 constituted by the mounting flange portion 592 and the rib 593 is an example of an implementation configuration corresponding to the “oil discharge passage” in the present invention.

The front cover 518 basically has the same configuration as the front cover 18 provided in the internal combustion engine 1 according to the first embodiment except that the rib 576 is provided instead of the rib 76. Specifically, as shown in FIG. 23, the front cover 518 includes a cylinder head 504, a cylinder block 508, a mounting flange portion 572 that contacts the mounting flange portions 542, 584, and 592 of the upper oil pan 510, and a cylinder head The rib 74 provided at a position corresponding to the rib 46 b so as to contact the rib 46 b provided on the 504, and the ribs 46 a, 588 a, 593 provided on the cylinder block 508 and the upper oil pan 510, respectively. And ribs 576 provided at positions corresponding to the ribs 46a, 588a, and 593. The protruding end of the mounting flange portion 572 and the protruding ends of the ribs 74 and 576 are configured to be flush with each other.

  In the internal combustion engine 500 according to the second embodiment configured as described above, when the cylinder head 504, the cylinder block 508, and the upper oil pan 510 are assembled, as shown in FIG. 22, the ribs 46a, 588a, and 593 are continuous. A single rib is formed, and as shown in FIG. 24, the front cover 518 is fastened to the cylinder head 504, the cylinder block 508, and the upper oil pan 510, so that the regions 588 and 595 are shown in FIG. A closed space 599 is formed between the front cover and the front cover. In addition, when the front cover 518 is fastened to the cylinder head 504 and the cylinder block 508, the ribs 74 and 576 abut on the ribs 46a, 46b, and 588a, and the gas-liquid separation chamber 590 is configured.

The closed space 599 communicates with the gas-liquid separation chamber 590, and the oil component in the blow-by gas separated in the gas-liquid separation chamber 590 is returned to the lower oil pan 512 through the closed space 599. Here, since the lower end portion of the rib 593 is configured to be immersed in the oil stored in the upper oil pan 510 and the lower oil pan 512, the oil discharged from the region 595 can reduce the oil level OL of the oil. Since it is not struck, the foaming of oil can be effectively suppressed. In addition, the backflow of blow-by gas from the region 595 can be effectively prevented. In addition, the separation action of the oil component from the blow-by gas by the gas-liquid separation chamber 590 is the same as that of the internal combustion engine 1 according to the first embodiment.

  In the internal combustion engine 500 according to the second embodiment, the oil level gauge 532 inserted from the insertion opening 534a of the insertion portion 534 is inserted into the closed space 599 described above, whereby the measurement portion of the oil level gauge 532 is measured. In this configuration, 532c is guided into the oil. That is, the gas-liquid separation chamber 590 and the closed space 599 are used as an oil level gauge guide. This eliminates the need for a dedicated passage for the oil level gauge 532. Here, the oil level gauge 532 is satisfactorily guided by the rib 46b, the rib 588a, and the rib 593 until the measurement unit 532c is immersed in the oil.

  The dimensions are such that the blow-by gas in the gas-liquid separation chamber 590 and the oil component separated from the blow-by gas are not blown out from the insertion opening 534a due to the pressure difference between the pressure in the gas-liquid separation chamber 590 and the atmospheric pressure. Thus, since the dimension L from the tip 46b ′ of the rib 46b of the cylinder head 504 to the insertion opening 534a is set (see FIG. 22), even if the oil level gauge 532 is forgotten to be attached, the insertion opening 534a It is possible to satisfactorily prevent the oil from being blown out.

  In the second embodiment, ribs 46a, 46b, 588a, 593 are provided on the cylinder head 504, the cylinder block 508, and the upper oil pan 510, and ribs corresponding to the ribs 46a, 46b, 588a, 593 are provided on the front cover 518. 74, 576 are provided, but the present invention is not limited to this. For example, a rib is provided only on the cylinder head 504, the cylinder block 508, and the upper oil pan 510, and the rib is brought into contact with the front cover 518. On the contrary, only the front cover 518 is provided with a rib, It is good also as a structure contact | abutted to the cylinder head 504, the cylinder block 508, and the upper oil pan 510. FIG.

  This embodiment shows an example for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the present embodiment.

1 Internal combustion engine (internal combustion engine)
2a Intake camshaft (camshaft)
2b Exhaust camshaft (camshaft)
4 Cylinder head (engine block, cylinder head)
4a Front wall part 4a 'Overhang part 4b Rear wall part 4c Side wall part 4d Side wall part 4e Support wall part 4f Lower end part 6 Rocker cover 8 Cylinder block (engine block, cylinder block)
8a Front wall portion 8a 'Overhang portion 8a''Overhang portion 8b Rear wall portion 8c Side wall portion 8d Side wall portion 8e Support wall portion 8f Lower end portion 10 Upper oil pan (engine block, oil pan)
10a Front wall portion 10b Rear wall portion 10c Side wall portion 10d Side wall portion 10e Baffle plate 12 Lower oil pan (oil pan)
14 Crankshaft (Crankshaft)
16 Chain (Transmission member)
18 Front cover (cover member)
42 mounting flange portion 42a mounting flange portion 42b mounting flange portion 44 housing portion 46 region 46a rib (partition wall portion)
46a 'upper end (upper end of partition wall)
46b Rib (intersection wall)
46b 'tip (one end of the crossing wall)
52 Through hole (oil discharge passage)
62 Entrance (Blowby gas inlet)
64 Through hole (Blow-by gas discharge port)
70 PCV valve 72 Mounting flange 74 Rib 76 Rib (partition wall)
82 Cylinder bore 84 Mounting flange part 86 Housing part 88 Area (oil collecting part)
88a Rib (partition wall)
89 Through hole (oil return passage)
90 Gas-liquid separation chamber (gas-liquid separation chamber)
92 Mounting flange portion 94 Housing portion 96 Notch 104 Cylinder head (engine block, cylinder head)
142 Mounting flange portion 144 Housing portion 146 Area 146a Rib (partition wall portion)
146a 'tip 146b rib (crossing wall)
146b 'tip 147 collision rib 147' tip 162 inlet (blow-by gas inlet)
164 Through hole (Blow-by gas outlet)
204 Cylinder head (engine block, cylinder head)
218 Front cover (cover member)
242a Mounting flange 246a Rib (partition wall)
246b Rib (intersection wall)
272 Mounting flange part 274 Rib 276 Rib (cross wall part)
304 Cylinder head (engine block, cylinder head)
318 Front cover (cover member)
318a Bottom 342a Mounting flange 346a Rib (partition wall)
346b Rib (intersection wall)
372 Mounting flange 404 Cylinder head (engine block, cylinder head)
404a Front wall portion 418 Front cover (cover member)
442a Mounting flange portion 472 Mounting flange portion 474 Rib (cross wall portion)
476 rib (partition wall)
500 Internal combustion engine (internal combustion engine)
504 Cylinder head (engine block, cylinder head)
4d 'flange 506 Rocker cover (head cover)
508 Cylinder block (engine block, cylinder block)
508f Lower end 510 Upper oil pan (engine block, oil pan)
512 Lower oil pan (oil pan)
518 Front cover (cover member)
532 Oil level gauge (oil level gauge)
532a Handle part 532b Main body part 532c Measuring part (measuring part)
534 Insertion part 534a Insertion opening (insertion opening)
534b Insertion passage (insertion passage)
534c Connection opening 542 Mounting flange portion 542b Mounting flange portion 543 Communication opening 546 area 572 Mounting flange portion 576 Rib (partition wall portion)
584 Mounting flange portion 588 Region 588a Rib (partition wall portion)
590 Gas-liquid separation chamber 592 Mounting flange 593 Rib (partition wall)
595 area 599 closed space (oil return passage, oil discharge passage, oil level gauge guide)
CR crank chamber CHR chain chamber (containment chamber)
OL oil level

Claims (15)

An internal combustion engine configured to recirculate blowby gas to an intake passage,
A crankshaft,
A camshaft,
A transmission member wound around the crankshaft and the camshaft and configured to transmit rotation of the crankshaft to the camshaft;
An engine block configured to rotatably support the crankshaft and the camshaft;
A cover member fastened to the engine block to cover the transmission member;
With
When the cover member is fastened to the engine block, a storage chamber for storing the transmission member, and a gas-liquid separation chamber are configured,
The gas-liquid separation chamber is disposed adjacent to the storage chamber on the side where the transmission member is in the upward direction from the crankshaft side to the camshaft side, and is configured to communicate with the storage chamber. An introduction port, and an intersecting wall portion that is disposed to face the transmission member, and is configured so that one end is directed to the blow-by gas introduction port and extends in a direction intersecting a tangential direction of the transmission member. An internal combustion engine configured to have a blow-by gas discharge port configured to communicate with the intake path. The gas-liquid separation chamber is configured to be partitioned from the storage chamber by a partition wall portion integrally formed with at least one of the engine block and the cover member so as to extend in the upward direction.
The partition wall portion is configured such that the distance from the transmission member gradually decreases from the lower side in the upward direction toward the upper side.
The internal combustion engine according to claim 1, wherein the blow-by gas introduction port is disposed at an upper end portion in the upward direction of the partition wall portion. The internal combustion engine according to claim 1, wherein the intersecting wall portion is configured to extend in a direction orthogonal to a tangential direction of the transmission member. The intersecting wall portion is configured to partition the gas-liquid separation chamber and the storage chamber,
The internal combustion engine according to claim 2, wherein the blow-by gas introduction port is configured by one end portion of the intersecting wall portion and an upper end portion of the partition wall portion. The intersecting wall portion is configured such that the one end portion is disposed on a side opposite to the side on which the transmission member is disposed with respect to the partition wall portion, and the one end portion and an upper side end of the partition wall portion The internal combustion engine according to claim 4, wherein the portion is configured to overlap in the upward direction. The internal combustion engine according to any one of claims 1 to 5, wherein the blow-by gas discharge port is disposed above the blow-by gas introduction port. An oil pan that can store oil
The gas-liquid separation chamber has an oil collecting portion that collects an oil component separated from blow-by gas introduced into the gas-liquid separation chamber at a lower portion in the upward direction,
The internal combustion engine according to any one of claims 1 to 6, wherein the engine block is configured to include an oil return passage portion that returns oil collected by the oil collection portion to the oil pan. The oil pan has an oil discharge passage portion connected to the oil return passage portion,
The internal combustion engine according to claim 7, wherein the oil discharge passage portion is configured to be immersed in the oil when the oil is stored in the oil pan. The engine block includes a cylinder head configured to rotatably support the camshaft, and a cylinder block configured to rotatably support the crankshaft.
The intersecting wall portion is integrally formed with at least one of the cylinder head and the cover member,
The internal combustion engine according to any one of claims 1 to 8, wherein the partition wall portion is integrally formed from the cylinder block to the cylinder head. An oil pan that can store oil
The said engine block is comprised so that it may have an oil return channel | path part which returns the oil component isolate | separated from the blow-by gas introduced in the said gas-liquid separation chamber to the said oil pan. The internal combustion engine described. The oil pan has an oil discharge passage portion connected to the oil return passage portion,
The internal combustion engine according to claim 10, wherein the oil discharge passage is configured to be immersed in the oil when the oil is stored in the oil pan. An oil level gauge further comprising a measuring unit for measuring the amount of oil stored in the oil pan;
The oil level gauge guide part configured to guide the oil level gauge so that the measurement part is immersed in oil stored in the oil pan is constituted by the gas-liquid separation chamber and the oil return passage part. The internal combustion engine according to 10 or 11. The engine block includes a cylinder head configured to rotatably support the camshaft, and a cylinder block configured to rotatably support the crankshaft.
The intersecting wall portion is integrally formed with at least one of the cylinder head and the cover member,
The partition wall portion is configured to have a length from the oil pan to the cylinder head,
The internal combustion engine according to any one of claims 10 to 12, wherein the oil return passage portion and the oil discharge passage portion are configured using the partition wall portion. A head cover configured to form a part of the storage chamber by being attached to an upper portion of the cylinder head;
The head cover is configured to have an insertion opening and an insertion passage for inserting the oil level gauge into the oil level gauge guide portion.
The insertion opening is provided at a height position such that the oil component separated from the blow-by gas is not blown out from the insertion opening even by a differential pressure between the pressure in the gas-liquid separation chamber and the atmospheric pressure.
The internal combustion engine according to claim 13, which is dependent on claim 12 . The internal combustion engine according to claim 14, wherein the insertion opening is configured to open in a direction in front of the vehicle when the internal combustion engine is mounted on the vehicle.

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