JP2013160125A - Blow-by gas treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blow-by gas treatment device capable of easily thawing ice when a PCV valve is frozen.SOLUTION: This device includes a partition wall 50 of a shape of separating a part between an opening of a gas introducing passage 33 and a gas inflow port 41d at the inside of a separator case 32. Blow-by gas flowing in the separator case 32 from the gas introducing passage 33 is blown to the partition wall 50, and discharged to an intake passage by passing in order of a labyrinth type oil separator, a cyclone type oil separator 41 and a PCV valve 35 after bypassing the partition wall 50. The partition wall 50 has two first walls 53 extended in a mode of passing through a position on a side separating from the opening of the gas introducing passage 33 more than the PCV valve 35 and extending at an interval toward the PCV valve 35 from a position on the opening side of the gas introducing passage 33 more than the PCV valve 35, and a second wall 54 extending along a peripheral wall of the PCV valve 35 in a shape of connecting these first walls 53.

Description

  The present invention relates to a blow-by gas processing apparatus.

  2. Description of the Related Art A blow-by gas processing device that discharges combustion gas (so-called blow-by gas) leaked from a combustion chamber into a crankcase during operation of an internal combustion engine into an intake passage has been put into practical use. In such a device, it is also practical to provide an oil separator for separating and removing the oil in the blow-by gas in the middle of the gas passage connecting the crankcase and the intake passage. Furthermore, as such an oil separator, there are provided a passage through which blow-by gas flows and a partition wall for extending the time (so-called labyrinth type) and a cyclone chamber in which blow-by gas swirls inside. It is proposed to provide two of them (so-called cyclone type) (see, for example, Patent Document 1).

  An example of such a blow-by gas processing apparatus is shown in FIGS. In the example shown in FIGS. 7 and 8, the cover 101 is attached to the outer wall of the cylinder block 100. The cover 101 and the outer wall of the cylinder block 100 constitute a separator case 102. A cyclonic oil separator 103 is attached inside the separator case 102. In addition, a partition wall 104 having a shape that connects the inner wall of the separator case 102 and the outer wall of the cyclonic oil separator 103 is formed inside the separator case 102. A labyrinth oil separator 105 is formed by the inner wall of the separator case 102, the outer wall of the cyclonic oil separator 103, and the partition wall 104.

  A gas introduction passage 106 communicating with the inside of the crankcase is opened inside the separator case 102. Blow-by gas is introduced into the separator case 102 through the gas introduction passage 106. A PCV valve 107 is attached to the cyclone type oil separator 103, and a gas discharge passage 108 connected to the intake passage of the internal combustion engine is connected to the PCV valve 107. The blow-by gas inside the cyclonic oil separator 103 is discharged to the intake passage through the PCV valve 107 and the gas discharge passage 108. Further, in the separator case 102, a partition wall is provided between the opening of the gas introduction passage 106 and the gas inlet 109 (specifically, the mounting portion of the PCV valve 107) of the cyclonic oil separator 103. 110 is formed.

  In such a device, as indicated by an arrow in the figure, the blow-by gas that has flowed into the separator case 102 through the gas introduction passage 106 is blocked by the partition wall 110 and bypasses the flow, so that “labyrinth oil The separator flows in the order of “separator 105 → cyclone type oil separator 103 → PCV valve 107 → intake passage”. Thereby, after the oil separation by the labyrinth type oil separator 105 is achieved, the oil separation by the cyclone type oil separator 103 is further achieved, so that the oil separation from the blow-by gas is suitably performed. .

JP 2004-84506 A

  By the way, by providing two types of oil separators 103 and 105 of a cyclone type and a labyrinth type, it becomes possible to sufficiently separate and remove the oil contained in the blow-by gas. However, if the two oil separators 103 and 105 are disposed, the path and time for the blow-by gas to flow in the separator case 102 become longer, and therefore the temperature of the blow-by gas is likely to be lowered. As a result, the temperature of the blow-by gas that passes through the PCV valve 107 is likely to be low. Therefore, when the PCV valve 107 is frozen when the engine is stopped in a low-temperature environment, the PCV valve 107 is slowly defrosted when the engine is subsequently started. There is a risk of inconvenience such as.

  In addition to the above-described device, if the device is provided with some oil separator (for example, a filter device) other than the labyrinth type oil separator inside the separator case, the route and time for the blow-by gas to flow are long. Inconveniences such as causing delays in the PCV valve de-icing due to this can occur as well.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a blow-by gas processing apparatus that can quickly perform ice melting when a PCV valve is frozen.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The apparatus according to claim 1 includes an oil separator disposed inside the separator case, a gas introduction passage communicating the inside of the separator case and the inside of the crankcase, an outer wall of the oil separator, and an inner wall of the separator case. A labyrinth type oil separator including a partition wall disposed between the outer wall and the inner wall. Also, a PCV valve that is attached to the oil separator and adjusts the amount of blow-by gas discharged from the inside of the oil separator to the engine intake passage, and between the inner wall of the case and the outer wall of the oil separator inside the separator case. And a partition that extends in a shape that separates the opening of the gas introduction passage and the gas inlet through which gas flows into the oil separator. The blow-by gas that has flowed into the separator case from the gas introduction passage is blown to the partition wall, bypasses the partition wall, passes through the labyrinth type oil separator, the oil separator, and the PCV valve in this order and is discharged to the engine intake passage. The

  In the apparatus according to claim 1, the partition wall is extended in such a manner as to pass through a position on the side farther from the opening of the gas introduction passage than the PCV valve. Therefore, the blow-by gas that has flowed into the separator case through the gas introduction passage passes through the labyrinth-type oil separator or oil separator, and before it drops in temperature, in other words, remains at a relatively high temperature to the PCV valve. It becomes possible to spray.

  Moreover, in the apparatus according to claim 1, the partition wall includes two first wall portions extending from the position of the opening side of the gas introduction passage with respect to the PCV valve at a distance from the PCV valve, and the first wall portion. And a second wall portion extending along the peripheral wall of the PCV valve in a shape connecting the wall portions. Therefore, a part of the blow-by gas that flows into the separator case and is blown to the partition wall is guided to the PCV valve placement position by these first wall portion and second wall portion, and is efficiently blown to the PCV valve. Can do.

  As described above, according to the apparatus of the first aspect, since the blow-by gas can be efficiently blown onto the PCV valve in a relatively high temperature state, the ice can be defrosted quickly when the PCV valve is frozen. It becomes like this.

  In addition, as the oil separator, a cyclonic oil separator having a cyclone chamber having a shape for swirling blow-by gas and a housing case in which the cyclone chamber is formed is adopted as the oil separator. it can.

  According to a third aspect of the present invention, the apparatus includes an oil return passage that communicates the inside of the separator case with the inside of the crankcase. The oil inside the separator case is returned to the inside of the crankcase through the oil return passage. In the cyclone type oil separator, a guide passage for guiding the oil separated in the oil separator to the oil return passage extends from the outer wall of the housing case toward the opening in the separator case of the oil return passage. It is formed with. Furthermore, in addition to the first wall portion and the second wall portion, the partition wall has a shape that connects the outer wall of the guide passage and the inner wall of the separator case, and a third wall portion that extends in the extending direction of the guide passage. have.

  According to the apparatus of claim 3, when the oil separated from the blow-by gas in the separator case adheres to the partition wall, a part of the oil flows down the third wall portion, so that the oil is separated from the blow-by gas. The made oil can be suitably guided to the oil return passage.

  In the apparatus according to claim 4, the partition wall is integrally formed with the oil separator in a shape protruding from the outer wall of the oil separator, while a groove having a shape in which the tip of the partition wall engages with the inner wall of the separator case. It is formed. Therefore, it is preferable to prevent unnecessary leakage of blow-by gas through the gap between the tip of the partition wall and the inner wall of the separator case, as compared with the case in which the portion of the separator case inner wall facing the tip of the partition wall is formed in a planar shape. Can be suppressed. In addition, when installing the oil separator inside the separator case, the oil separator in the separator case can be obtained through a simple operation of engaging the groove formed in the separator case with the tip of the partition wall formed in the oil separator. Can be accurately positioned.

  In addition, as said separator case, what was comprised by the cover attached so that the outer wall of a cylinder block and the outer wall might be covered can be employ | adopted.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows schematic structure of the blowby gas processing apparatus concerning one Embodiment which actualized this invention. The fragmentary sectional view which shows the internal structure of a separator case. The perspective view which shows the perspective structure of a cyclone type oil separator. Sectional drawing which shows the cross-section along the AA line of FIG. 2 of a separator case. Sectional drawing which shows the cross-section of the cover seen from the cylinder block side. The end view which shows the positional relationship of the front-end | tip of a cover side partition, and the convex part of a cover. The fragmentary sectional view which shows an example of the conventional blowby gas processing apparatus. FIG. 8 is a partial cross-sectional view of the blow-by gas processing apparatus taken along line BB in FIG. 7.

Hereinafter, an embodiment in which a blow-by gas processing apparatus according to the present invention is embodied will be described.
First, a schematic configuration of the blow-by gas processing apparatus according to the present embodiment and an internal combustion engine to which the apparatus is applied will be described.

  As shown in FIG. 1, an intake passage 12 is connected to the combustion chamber 11 of the internal combustion engine 10, and a throttle valve 13 is provided in the intake passage 12. In the internal combustion engine 10, air is sucked into the combustion chamber 11 through the intake passage 12, and the amount thereof is adjusted through opening control of the throttle valve 13. An exhaust passage 14 is connected to the combustion chamber 11 of the internal combustion engine 10.

  A crankshaft 16 is provided inside the crankcase 15 of the internal combustion engine 10. A piston 19 is connected to the crankshaft 16 via a connecting rod 18. During operation of the internal combustion engine 10, the reciprocating movement of the piston 19 is converted into the rotational movement of the crankshaft 16 by the connecting rod 18.

  An oil pan 21 is attached to the internal combustion engine 10 so as to cover an end of the vehicle on the lower side. The internal combustion engine 10 is provided with an oil pump that pumps oil in the oil pan 21. As this oil pump, an engine drive type driven by the rotational force of the crankshaft 16 of the internal combustion engine 10 is employed. The oil pumped up by this oil pump is pumped to each lubricating part of the internal combustion engine 10. For example, the lubricating parts include sliding parts around the crankshaft 16, the connecting rod 18 and the piston 19 disposed in the cylinder block 17, and the intake valve 24 and the exhaust valve 25 disposed in the cylinder head 23. Peripheral sliding parts. Then, the oil after being used for lubrication of each lubrication part of the internal combustion engine 10 hangs down inside the internal combustion engine 10 (specifically, the cylinder head 23, the cylinder block 17, and the crankcase 15), and again enters the oil pan 21. It is to be stored.

  The internal combustion engine 10 is provided with a blow-by gas processing device 30. This blow-by gas processing device 30 is used to recirculate the combustion gas leaked from the combustion chamber 11 into the crankcase 15 through the clearance between the sliding surfaces of the piston 19 and the cylinder 26, that is, blow-by gas into the intake air for processing. Is.

  The blow-by gas processing device 30 includes an air introduction passage 31 that communicates a portion of the intake passage 12 upstream of the throttle valve 13 in the intake flow direction with the inside of the internal combustion engine 10 (specifically, the cylinder head cover 27).

  On the outer wall of the cylinder block 17 of the internal combustion engine 10 is provided a separator case 32 in which an oil separator for separating oil in blow-by gas is incorporated. The cylinder block 17 of the internal combustion engine 10 is formed with a gas introduction passage 33 that communicates the inside of the crankcase 15 and the inside of the separator case 32. The separator case 32 is provided with a gas discharge passage 34 that communicates the inside of the separator case 32 with the portion of the intake passage 12 downstream of the throttle valve 13 in the intake flow direction (hereinafter simply referred to as “downstream side”). In this way, in the blow-by gas processing device 30, the inside of the crankcase 15 and the portion of the intake passage 12 downstream from the throttle valve 13 are communicated with each other via the gas introduction passage 33, the separator case 32, and the gas discharge passage 34. Yes.

  In such a blow-by gas processing device 30, the internal pressure of the crankcase 15 that has become close to atmospheric pressure due to the introduction of outside air through the air introduction passage 31 and the pressure in the portion downstream of the throttle valve 13 in the intake passage 12 (intake negative pressure). Therefore, the blow-by gas inside the crankcase 15 is sucked into the intake passage 12 through the gas introduction passage 33, the separator case 32, and the gas discharge passage 34 and is recirculated into the intake air.

  In the blow-by gas processing apparatus 30, the separator case 32 is connected to the gas discharge passage 34 via the PCV valve 35. The PCV valve 35 is a differential pressure operating valve, and the opening of the PCV valve 35 is smaller as the pressure on the crankcase 15 side (specifically, the separator case 32 side) is higher than the pressure on the intake passage 12 side. When the opening is changed and the pressure on the crankcase 15 side is equal to or lower than the pressure on the intake passage 12 side, the PCV valve 35 is closed. The flow rate of the blow-by gas discharged to the intake passage 12 through the gas introduction passage 33, the separator case 32, and the gas discharge passage 34 by the PCV valve 35 is the difference between the pressure on the crankcase 15 side and the pressure on the intake passage 12 side. It is adjusted autonomously according to.

Hereinafter, a specific structure of the separator case 32 will be described.
As shown in FIG. 2, a cover 40 is attached to the cylinder block 17 of the internal combustion engine 10 so as to cover its outer wall. The separator case 32 is formed by the cover 40 and the outer wall of the cylinder block 17. Inside the separator case 32, a cyclone type oil separator 41 as an oil separator for separating oil from blow-by gas is attached.

  FIG. 3 shows a perspective structure of the cyclonic oil separator 41, and FIG. 4 shows a cross-sectional structure of the separator case 32 taken along line AA in FIG. As shown in FIG. 3 or FIG. 4, the cyclone type oil separator 41 has a cyclone chamber 41a having a shape in which blow-by gas is swirled therein and a housing case 41b in which the cyclone chamber 41a is formed. . A labyrinth oil separator 42 is provided inside the separator case 32. The labyrinth-type oil separator 42 protrudes from the outer wall of the cyclone-type oil separator 41 in a shape that is arranged between the outer wall of the cyclone-type oil separator 41, the inner wall of the separator case 32, and the outer wall and the inner wall. And a partition wall 42a.

  The PCV valve 35 is attached to a cyclone type oil separator 41. Specifically, a communication passage 43 that connects the outside of the cover 40 and the inside of the cyclonic oil separator 41 is formed integrally with the cover 40, and the valve body 44 is attached to the communication passage 43. In the present embodiment, the communication passage 43 and the valve main body 44 function as the PCV valve 35. The end of the communication passage 43 on the inner side of the separator case 32 is connected to a through-hole 41 c formed in the housing case 41 b of the cyclonic oil separator 41, and the cyclonic oil separator is placed in the separator case 32. 41 is disposed. In the present embodiment, the inside of the oil separator 41 and the gas discharge passage 34 are communicated with each other via the PCV valve 35, and the blow-by gas from the inside of the oil separator 41 to the intake passage 12 is communicated by the PCV valve 35. Emissions are adjusted.

  The separator case 32 extends in a shape connecting the inner wall of the separator case 32 and the outer wall of the cyclonic oil separator 41, and gas flows into the opening of the gas introduction passage 33 and the cyclonic oil separator 41. A partition wall 50 extending in a shape separating the gas inlet 41d is provided.

  In the present embodiment, the blow-by gas that has flowed into the separator case 32 from the gas introduction passage 33 is blown to the partition walls 50 before flowing into the oil separators 41 and 42, so that the gas introduction passages 33 and the partition walls 50 are blown. Is extended. Therefore, as shown by the arrow in FIG. 2, when blow-by gas flows into the separator case 32 from the gas introduction passage 33, the blow-by gas is first blown onto the partition wall 50. Thereafter, the blow-by gas bypasses the partition wall 50, passes through the labyrinth oil separator 42, the cyclone oil separator 41, and the PCV valve 35 in this order, and is discharged to the intake passage 12 of the internal combustion engine 10. The white arrows in FIG. 2 indicate the flow direction of blow-by gas that flows through the cylinder block 17 side from the cyclone oil separator 41.

  In the cylinder block 17 of the internal combustion engine 10, an oil return passage 36 that communicates the inside of the crankcase 15 and the inside of the separator case 32 is formed separately from the gas introduction passage 33. The opening 36 a of the oil return passage 36 is formed at a position near the bottom of the separator case 32 on the outer wall of the cylinder block 17. The oil separated from the blow-by gas by the labyrinth type oil separator 42 or the cyclone type oil separator 41 flows down to the bottom of the separator case 32 and flows into the oil return passage 36 through the opening 36a and flows into the crankcase 15. It is designed to be returned to the inside.

  As shown in FIG. 2 or 3, a guide passage 41e for guiding the oil separated inside the oil separator 41 to the vicinity of the opening 36a is provided on the outer wall of the cyclonic oil separator 41. ing. The guide passage 41e has a shape that extends linearly from the outer wall of the housing case 41b of the oil separator 41 toward the opening 36a of the oil return passage 36, and has a hollow shape that opens at the tip thereof. . When the oil separated from the blow-by gas inside the cyclone type oil separator 41 flows down inside and reaches the bottom of the housing case 41b, the oil further flows down inside the guide passage 41e to guide to the vicinity of the oil return passage 36. Will come to be.

Hereinafter, the shape of the partition 50 will be described in detail.
As shown in FIG. 3 or FIG. 4, the partition wall 50 is specifically separated from the cylinder block 17 by the block side partition wall 51 formed in the portion closer to the cylinder block 17 than the cyclone type oil separator 41. It is comprised by the cover side partition 52 formed in the side to do.

  The block-side partition wall 51 extends in the extending direction of the guide passage 41e and a wall portion 51a integrally formed with the housing case 41b in a shape extending in a substantially horizontal direction in the vicinity of the end portion on the lower side in the vertical direction of the outer wall of the housing case 41b. The wall portion 51b is formed integrally with the guide passage 41e.

  As shown in FIG. 2 or FIG. 4, the cover-side partition wall 52 is extended in such a manner that it passes through a position on the outer wall of the housing case 41b of the oil separator 41 on the side farther from the opening of the gas introduction passage 33 than the PCV valve 35. The housing case 41b is integrally formed.

  By setting the extending shape of the cover-side partition wall 52 in this way, the following operation can be obtained. That is, before a part of the blow-by gas that flows into the separator case 32 through the gas introduction passage 33 bypasses the partition wall 50 and flows into the labyrinth oil separator 42 or the cyclone oil separator 41, the PCV It comes to be sprayed on the valve | bulb 35 (refer the arrow in FIG. 2). Therefore, the blow-by gas having a higher temperature is brought into contact with the PCV valve 35 as compared with the apparatus in which only the blow-by gas that has passed through the labyrinth type oil separator or the cyclone type oil separator is brought into contact with the PCV valve. Become.

  The cover side partition wall 52 extends from the opening side (lower side in FIG. 2) of the gas introduction passage 33 toward the PCV valve 35 at a distance from the mounting portion of the PCV valve 35 in the housing case 41b. Two first wall portions 53 are provided. More specifically, these first wall portions 53 are the shortest of the paths through which the blow-by gas that has flowed into the separator case 32 from the gas introduction passage 33 flows along the outer wall surface of the housing case 41 b and reaches the mounting portion of the PCV valve 35. Each is formed in a shape extending between the paths and extending in parallel with the shortest path so as to be along the shortest path.

  The cover-side partition wall 52 extends in a semicircular shape along the peripheral wall of the PCV valve 35 (specifically, the communication passage 43) so as to connect the end portions of the two first wall portions 53 on the PCV valve 35 side to each other. A second wall portion 54 is provided.

  Furthermore, the cover-side partition wall 52 has a shape that extends from the end of each of the two first wall portions 53 on the gas introduction passage 33 side to the starting point and further away from the shortest path as the distance from the PCV valve 35 increases. Two base wall portions 55 extending are provided.

  By forming the cover side partition wall 52 in this way, a part of the blow-by gas that flows into the separator case 32 and is blown to the cover side partition wall 52 flows into the gap between the two first wall portions 53. Since the PCV valve 35 is guided to the position where it is disposed, the PCV valve 35 can be efficiently sprayed.

  As described above, in the blow-by gas processing apparatus 30 according to the present embodiment, since the blow-by gas is efficiently blown to the PCV valve 35 in a relatively high temperature state, the ice is rapidly melted when the PCV valve 35 is frozen. be able to.

  In the present embodiment, in addition to the first wall portion 53 and the second wall portion 54, the cover side partition wall 52 is formed integrally with the guide passage 41e so as to extend in the extending direction of the guide passage 41e. A wall 56 is provided. The third wall portion 56 has an extending shape that connects the outer wall of the guide passage 41 e and the inner wall of the separator case 32, and the gas on the guide passage 41 e side of the two base wall portions 55. The end of the introduction passage 33 on the opening side (the lower side in FIG. 2) is formed in a shape extending from the starting point. When oil separated from the blow-by gas adheres to the first wall portion 53, the second wall portion 54, and the base wall portion 55, a part of the oil flows down the third wall portion 56. The oil separated from the oil can be suitably guided to the oil return passage 36.

  FIG. 5 shows a cross-sectional structure of the cover 40 as viewed from the cylinder block 17 side. As shown in FIG. 5, two convex portions 40a are formed on the inner surface of the cover 40 so as to extend in the same distance from each other. The two convex portions 40a are each formed in a shape that protrudes along the side surface of the front end so as to sandwich the front end of the cover-side partition wall 52 (see FIG. 2).

  FIG. 6 shows the positional relationship between the tip of the cover-side partition wall 52 and the convex portion 40 a of the cover 40. As shown in FIG. 6, by forming two convex portions 40 a on the inner surface of the cover 40, a portion sandwiched between the convex portions 40 a functions as a groove extending along the tip of the cover-side partition wall 52. To come. When the cyclonic oil separator 41 and the cover 40 are attached to the cylinder block 17, the tip of the cover-side partition wall 52 is engaged with a groove formed between the two convex portions 40 a on the inner surface of the cover 40. .

  As a result, the shape of the gap between the tip of the cover-side partition wall 52 and the inner wall of the separator case 32 is smaller than that in which the portion of the inner wall of the separator case 32 facing the tip of the cover-side partition wall 52 is formed in a planar shape. Due to the complexity, unnecessary leakage of blow-by gas through the gap is suitably suppressed.

  In addition, when attaching the cyclonic oil separator 41 to the inside of the separator case 32, the groove on the inner surface of the cover 40 (specifically, the two protrusions 40a) and the tip of the cover-side partition wall 52 of the oil separator 41 are engaged. The oil separator 41 can be accurately positioned in the separator case 32 through a simple operation such as combining them.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) The cover side partition wall 52 is formed in a shape extending through a position on the outer wall of the housing case 41b of the oil separator 41 on the side away from the opening of the gas introduction passage 33 from the PCV valve 35. Therefore, the blow-by gas having a high temperature is brought into contact with the PCV valve 35 as compared with a device in which only the blow-by gas that has passed through the labyrinth-type oil separator 42 or the cyclone-type oil separator 41 is brought into contact with the PCV valve. be able to. In addition, a part of the cover-side partition wall 52 is extended from the position on the opening side of the gas introduction passage 33 with respect to the PCV valve 35 from the position where the PCV valve 35 is mounted in the housing case 41b. The first wall portion 53 and the second wall portion 54 extending in a semicircular shape along the peripheral wall of the PCV valve 35 so as to connect the first wall portions 53 are configured. Therefore, a part of the blow-by gas that flows into the separator case 32 and is blown to the partition wall 50 can be efficiently blown to the PCV valve 35 by the first wall portion 53 and the second wall portion 54. Therefore, blow-by gas can be efficiently blown onto the PCV valve 35 in a relatively high temperature state, and de-icing can be performed early when the PCV valve 35 is frozen.

  (2) The shape of the guide passage 41e for guiding the oil separated inside the cyclone type oil separator 41 to the oil return passage 36 extends from the outer wall of the housing case 41b toward the opening 36a of the oil return passage 36. Formed with. A part of the cover-side partition wall 52 is formed by a third wall portion 56 that has a shape that connects the outer wall of the guide passage 41e and the inner wall of the separator case 32 and that extends in the extending direction of the guide passage 41e. As a result, when oil separated from the blow-by gas adheres to the first wall portion 53 and the second wall portion 54, a part of the oil flows down the third wall portion 56, so that the oil is separated from the blow-by gas. The oil can be suitably guided to the oil return passage 36.

  (3) The cover side partition wall 52 is formed integrally with the oil separator 41 so as to protrude from the outer wall of the cyclonic oil separator 41, and the tip of the cover side partition wall 52 is engaged with the inner wall of the cover 40 of the separator case 32. A groove having a shape to be formed was formed. Therefore, the blow-by through the gap between the front end of the cover-side partition wall 52 and the inner wall of the separator case 32 is compared with a portion where the front end of the cover-side partition wall 52 on the inner wall of the separator case 32 is formed in a planar shape. Gas unnecessary leakage can be suitably suppressed. In addition, when attaching the cyclonic oil separator 41 to the inside of the separator case 32, through a simple operation of engaging the groove formed on the inner surface of the cover 40 with the tip of the cover-side partition wall 52 formed on the oil separator 41. The oil separator 41 can be accurately positioned in the separator case 32.

The embodiment described above may be modified as follows.
-You may abbreviate | omit one or both of the two convex parts 40a formed in the inner surface of the cover 40.

-While omitting the two convex parts 40a, you may make it form in the inner surface of the cover 40 the groove | channel of the shape where the front-end | tip of the cover side partition 52 engages.
The cover side partition wall 52 may be integrally formed on the inner wall of the cover 40 instead of being integrally formed on the outer wall of the cyclonic oil separator 41.

  The cover-side partition wall 52 may be formed separately from the cyclone type oil separator 41 and the cover 40. In such an apparatus, the cover-side partition wall 52 is disposed such that a groove is formed in the outer wall of the cyclonic oil separator 41 or the inner wall of the cover 40 so that the tip of the cover-side partition wall 52 is engaged with the front end. It is desirable to provide some configuration for regulating the position.

The third wall portion 56 of the cover-side partition wall 52 and the wall portion 51b of the block-side partition wall 51 may be omitted.
-The apparatus concerning this Embodiment is applicable also to the apparatus provided with the cyclone type oil separator which is not provided with the guide channel | path 41e.

  The second wall portion 54 of the cover-side partition wall 52 is not limited to a semicircular shape, but extends along the peripheral wall of the PCV valve 35 on the side away from the opening of the gas introduction passage 33 from the mounting portion of the PCV valve 35. As long as the shape extends, it may be formed in an arbitrary extended shape.

  The two first wall portions 53 are not limited to be formed in a shape extending in parallel with the shortest path, but may be arbitrarily extended as long as the shape extends along the shortest path in a state of being spaced apart from each other. It can be formed in a shape.

  Instead of forming the two base wall portions 55 in an extended shape in which the distance from the shortest path becomes farther away from the PCV valve 35, for example, a shape extending in a direction perpendicular to the shortest path, for example. For example, it may be formed in a shape extending in the horizontal direction or in any shape.

  A configuration in which the valve main body 44 is directly connected to the oil separator 41 may be employed instead of the configuration in which the valve main body 44 is connected to the cyclonic oil separator 41 via the communication path 43. In such a configuration, only the valve body 44 functions as a PCV valve.

  The apparatus according to the above embodiment has a structure in which the inside and the outside communicate with each other only in the attachment portion of the PCV valve, the connection portion of the gas introduction passage 33, and the connection portion of the oil return passage 36, and the internal combustion engine. A case with a separate structure is adopted as the separator case, and the separator case can be applied to an apparatus attached to the internal combustion engine. The apparatus according to the present embodiment can also be applied to an apparatus in which the separator case is fixed to something other than the internal combustion engine.

  The apparatus according to the above embodiment can be applied to an apparatus in which an oil separator other than the cyclone type oil separator 41 is disposed inside the separator case. As such an oil separator, for example, a filter device having a structure in which a filter is housed in a housing case can be cited.

  DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Combustion chamber, 12 ... Intake passage, 13 ... Throttle valve, 14 ... Exhaust passage, 15 ... Crankcase, 16 ... Crankshaft, 17,100 ... Cylinder block, 18 ... Connecting rod, 19 ... Piston , 21 ... Oil pan, 23 ... Cylinder head, 24 ... Intake valve, 25 ... Exhaust valve, 26 ... Cylinder, 27 ... Cylinder head cover, 30 ... Blow-by gas treatment device, 31 ... Air introduction passage, 32, 102 ... Separator case, 33, 106 ... Gas introduction passage, 34, 108 ... Gas discharge passage, 35, 107 ... PCV valve, 36 ... Oil return passage, 36a ... Opening, 40, 101 ... Cover, 40a ... Projection, 41, 103 ... Cyclone Oil separator, 41a ... cyclone chamber, 41b ... storage case, 41c ... penetrating 41, 109 ... gas inlet, 41e ... guide passage, 42, 105 ... labyrinth type oil separator, 42a, 104 ... partition wall, 43 ... communication passage, 44 ... valve body, 50, 110 ... partition wall, 51 ... Block side partition, 51a, 51b ... wall, 52 ... cover side partition, 53 ... first wall, 54 ... second wall, 55 ... base wall, 56 ... third wall.

Claims (5)

An oil separator disposed inside the separator case;
A gas introduction passage communicating the inside of the separator case and the inside of the crankcase;
A labyrinth type oil separator comprising an outer wall of the oil separator, an inner wall of the separator case, and a partition wall disposed between the outer wall and the inner wall;
A PCV valve attached to the oil separator for adjusting the amount of blow-by gas discharged from the inside of the oil separator to the engine intake passage;
Inside the separator case, it extends in a shape connecting the inner wall of the case and the outer wall of the oil separator, and between the opening of the gas introduction passage and the gas inlet into which gas flows into the oil separator. The labyrinth-type oil separator and the oil separator after the blow-by gas that has flowed into the separator case from the gas introduction passage is blown to the partition wall and bypasses the partition wall , A blow-by gas processing device that passes through the PCV valves in this order and is discharged into the engine intake passage,
The partition wall is extended in such a manner as to pass through a position on the side farther from the opening of the gas introduction passage than the PCV valve, and the PCV valve from a position on the opening side of the gas introduction passage from the PCV valve. A blow-by gas processing apparatus comprising: two first wall portions extending at a distance toward the first wall portion; and a second wall portion extending along the peripheral wall of the PCV valve in a shape connecting the first wall portions. . The blow-by gas processing apparatus according to claim 1,
The blow-by gas processing apparatus according to claim 1, wherein the oil separator is a cyclone type oil separator having a cyclone chamber having a shape for swirling blow-by gas and a containing case in which the cyclone chamber is formed. The blow-by gas processing apparatus according to claim 2,
The apparatus includes an oil return passage that communicates the inside of the separator case and the inside of the crankcase,
In the cyclone type oil separator, a guide passage for guiding oil separated in the oil separator to the oil return passage is directed from an outer wall of the housing case to an opening in the separator case of the oil return passage. Formed in an elongated shape,
The blow-by gas processing apparatus, wherein the partition wall has a third wall portion having a shape connecting the outer wall of the guide passage and the inner wall of the separator case and extending in the extending direction of the guide passage. . In the blowby gas processing apparatus according to any one of claims 1 to 3,
The partition is formed integrally with the oil separator in a shape protruding from the outer wall of the oil separator,
The blow-by gas processing apparatus according to claim 1, wherein the separator case is formed with a groove having a shape in which an end of the partition wall engages with an inner wall thereof. In the blowby gas processing apparatus according to any one of claims 1 to 4,
The separator case comprises an outer wall of a cylinder block and a cover attached so as to cover the outer wall.