JP2017150418A - Blow-by gas hose connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blow-by gas hose connection structure capable of easily acknowledging visually a connected state of the blow-by gas hose and improving oil separation performance of blow-by gas.SOLUTION: A blow-by gas hose connection structure 1 connects a cylinder head cover 2 for a vehicle engine with an intake system member 3, an upper surface part of the cylinder head cover is provided with a bulged-out part 7 expanded upwardly, and a blow-by gas flowing-out part 8 is arranged to protrude upwardly. Then, the intake system member is installed on the cylinder head cover to cover the blow-by gas flowing-out part from above. An upper end side of the blow-by gas flowing-out part is provided with a connecting part 17 to which a lower end part of the blow-by gas hose 4 extending from the intake system member is connected and the connecting part is arranged more upward than the upper surface of the bulged-out part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a blowby gas hose connection structure, and more particularly to a blowby gas hose connection structure for connecting a cylinder head cover of an automobile engine and an intake system member.

  As a conventional blowby gas hose connection structure, a connection structure for connecting a cylinder head cover of an automobile engine and an intake system member is generally known (for example, see Patent Document 1). As the blow-by gas hose connection structure 101, for example, as shown in FIGS. 11 and 12, a separation space S1 for separating oil in blow-by gas generated in the engine is formed on the upper surface of the cylinder head cover 102. For this purpose, there is proposed a bulging portion 107 for bulging upward and a blowby gas outflow portion 108 in which a blowby gas outflow passage S2 connected to the separation space S1 is formed protruding upward. ing. The intake system member 103 is mounted on the cylinder head cover 102 so as to cover the blow-by gas outflow portion 108 from above, and a blow-by gas hose 104 extending from the intake system member 103 is disposed on the upper end side of the blow-by gas outflow portion 108. A connecting portion 117 to which the lower end portion is connected is provided, and the connecting portion 117 is disposed below the upper surface of the bulging portion 107. Further, a tightening tool 131 for tightening the lower end portion is provided on the outer peripheral side of the lower end portion connected to the connection portion 117 of the blow-by gas hose 104.

JP 2001-263036 A Japanese Patent Laying-Open No. 2005-083268

  However, in the conventional blowby gas passage connection structure 101, the intake system member 103 covers the blowby gas outflow portion 108 from above, and the connection portion 117 of the blowby gas outflow portion 108 is higher than the upper surface of the bulging portion 107. Since it is arranged below and hidden behind the bulging portion 107, the connection state of the lower end portion of the blow-by gas hose 104 and the fastening tool 131 via the space S 3 above the bulging portion 107 in the engine room of the automobile. It becomes difficult to check the tightening state. In order to solve this problem, it is conceivable to change the height of the bulging portion 107 to be low, but in this case, the volume of the separation space S1 for separating the oil in the blow-by gas is also reduced, and the oil separation performance is reduced. Resulting in.

  Here, in Patent Document 1, in a PCV system (Positive Crankcase Ventilation System) of an automobile engine, a gas outlet part of a cylinder head cover and an inlet pipe of an intake pipe are connected by a rubber hose, and the connecting part of the rubber hose is clamped. (See FIG. 8 of Patent Document 1). Further, as disclosed in Patent Document 2, in an automobile engine room, the arrangement of auxiliary machines for various engines is determined according to the requirements of each vehicle, and an intake passage formed integrally with an air cleaner on a cylinder head cover And a blow-by gas passage that connects the cylinder head cover and the intake passage may be provided along the vertical direction. In this case, the connection part of the blow-by gas passage has a structure that is difficult to see from the outside. In particular, when connecting using the rubber hose or clamp fitting described in Patent Document 1, it is difficult to confirm the connection state of the rubber hose and the tightening state of the clamp fitting.

  This invention is made in view of the said present condition, While providing the connection state of a blow-by gas hose easily visually, the connection structure of the blow-by gas hose which can improve the oil separation performance of blow-by gas is provided. With the goal.

In order to solve the above problem, the invention according to claim 1 is a blowby gas hose connection structure for connecting a cylinder head cover of an automobile engine and an intake system member, and the upper surface portion of the cylinder head cover includes A blow-by gas outflow in which a bulging portion for forming a separation space for separating oil in the blow-by gas generated in the engine is provided to bulge upward, and a blow-by gas outflow passage connected to the separation space is formed The intake system member is mounted on the cylinder head cover so as to cover the blow-by gas outflow portion from above, and the upper end side of the blow-by gas outflow portion is A connecting portion to which a lower end portion of the blow-by gas hose extending from the intake system member is connected is provided, and the connecting portion , And summarized in that disposed above the upper surface of the bulging portion.
According to a second aspect of the present invention, in the first aspect of the present invention, the intake system member is provided in a blow-by gas passage portion to which an upper end portion of the blow-by gas hose is connected and an upper portion of the blow-by gas passage portion. And a flat resonator section that covers the blow-by gas passage section.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the blow-by gas outflow portion rises from an upper surface portion of the cylinder head cover at a height equal to or higher than a height of the bulging portion, and an upper portion thereof. The present invention is provided with a raised portion provided with the connecting portion, and an oil separation mechanism for separating oil contained in blow-by gas flowing through the inner space is provided in the inner space of the raised portion. .
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the lower end portion is fastened to the outer peripheral side of the lower end portion connected to the connection portion of the blow-by gas hose. The gist is that a fastener is provided.
The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the engine is a front engine, and the blow-by gas outflow portion is bulged in the front-rear direction of the automobile. The intake system member covers the bulging portion from above, and the air intake system member and the bulging portion are disposed between the intake system member and the bulging portion from the front of the engine room of the automobile. The gist is that a space where the lower end of the blow-by gas hose can be seen is formed.

According to the blowby gas hose connection structure of the present invention, the upper surface portion of the cylinder head cover is provided with a bulging portion for bulging upward to form a separation space for separating oil in the blowby gas generated in the engine. In addition, a blow-by gas outflow portion in which a blow-by gas outflow path connected to the separation space is formed is provided so as to protrude upward. The intake system member is mounted on the cylinder head cover so as to cover the blow-by gas outflow portion from above, and the lower end portion of the blow-by gas hose extending from the intake system member is connected to the upper end side of the blow-by gas outflow portion. A connecting portion is provided, and the connecting portion is disposed above the upper surface of the bulging portion. Thereby, even if it is a type with which an intake system member is mounted on a cylinder head cover, the connection state of a blow-by gas hose can be easily confirmed visually through the space above the bulge part in the engine room of a car. As a result, the load of confirmation work during engine assembly and maintenance is greatly reduced. Furthermore, by increasing the protruding height of the blow-by gas outflow part, the space volume combining the separation space and the blow-by gas outflow path is expanded, and the blow bar gas flowing through the blow-by gas outflow path having a relatively small cross-sectional area is also provided. The flow rate is increased. As a result, the oil separation performance of blow-by gas can be improved.
In addition, when the intake system member includes a blow-by gas passage portion and a flat resonator portion, visibility from above is further reduced by the flat resonator portion. The connection state of the blow-by gas hose can be easily confirmed visually through the space above the bulging portion. Furthermore, since the blow-by gas outflow part is covered with a relatively thin and flat resonator part, the main part of the intake system member, that is, the entire engine can be made compact in the vertical direction.
The blow-by gas outflow portion includes a raised portion that rises from the upper surface portion of the cylinder head cover at a height equal to or higher than the height of the bulging portion and has the connection portion provided on the upper portion. When an oil separation mechanism is provided in the space, an effective oil separation action can be exerted at the blow-by gas outflow portion, and the internal space of the raised portion for ensuring the visibility of the connection state of the blow-by gas hose Can be used more effectively.
In addition, when a fastening tool for fastening the lower end portion is provided on the outer peripheral side of the lower end portion connected to the connection portion of the blow-by gas hose, visually check the fastening state of the fastening tool together with the connection state of the blow-by gas hose. Easy to confirm.
Further, the engine is a front engine, the blow-by gas outflow portion is disposed behind the bulging portion in the front-rear direction of the automobile, and the intake system member covers the bulging portion from above. When a space is formed between the intake system member and the bulging portion so that the lower end portion of the blow-by gas hose can be seen from the front of the engine room of the automobile, the front of the engine room of the automobile Therefore, the connection state of the blow-by gas hose can be easily confirmed visually.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a perspective view of a cylinder head cover assembly provided with the connection structure of the blowby gas hose concerning an example. It is a top view of the said cylinder head cover assembly body. It is the III-III sectional view taken on the line of FIG. It is a principal part enlarged view of FIG. It is the perspective view seen from the upper surface of the cylinder head cover concerning an example. It is the perspective view seen from the lower surface of the intake system member which concerns on an Example. It is the principal part top view seen from the lower surface of the said cylinder head cover (state which removed the baffle plate). It is a perspective view of the blow-by gas hose and the fastener according to the embodiment. It is explanatory drawing for demonstrating the connection structure of the blowby gas hose which concerns on the modification 1, (a) shows a principal part longitudinal cross-sectional view, (b) shows the bb sectional view taken on the line of (a). It is explanatory drawing for demonstrating the connection structure of the blowby gas hose which concerns on the modification 2, (a) shows a principal part longitudinal cross-sectional view, (b) shows the bb sectional view taken on the line of (a). It is a perspective view of a cylinder head cover assembly provided with the connection structure of the conventional blowby gas hose. It is the XII-XII sectional view taken on the line of FIG.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Blowby gas hose connection structure>
The blowby gas hose connection structure according to the present embodiment is a blowby gas hose connection structure (1) for connecting a cylinder head cover (2) and an intake system member (3) of an automobile engine, and is provided on the upper surface of the cylinder head cover. Is provided with a bulging portion (7) for forming a separation space (S1) for separating oil in the blow-by gas generated in the engine and bulging upward, and a blow-by gas outflow passage connected to the separation space A blow-by gas outflow portion (8) in which (S2) is formed is provided so as to protrude upward (see, for example, FIGS. 1 to 3). The intake system member (3) is mounted on the cylinder head cover (2) so as to cover the blow-by gas outflow portion (8) from above, and an intake system is disposed on the upper end side of the blow-by gas outflow portion (8). A connection part (17) to which the lower end part of the blow-by gas hose (4) extending from the member (3) is connected is provided, and the connection part (17) is arranged above the upper surface of the bulging part (7). (See, for example, FIG. 4).

  In addition, a space (S3) in which the lower end portion of the blow-by gas hose (4) can be seen is usually formed above the bulging portion (7) (see, for example, FIG. 3). Using this space (S3), for example, the blow-by gas hose (4) can be attached / detached to / from the connecting portion (17), or the fastening tool (31) can be attached / detached to / from the blow-by gas hose (4).

  As a blowby gas hose connection structure according to the present embodiment, for example, the intake system member (3) includes a blowby gas passage portion (25) to which an upper end portion of the blowby gas hose (4) is connected, and a blowby gas passage portion. And a flat resonator section (26) that is provided at the top and covers the blow-by gas passage section (see, for example, FIGS. 1 to 3).

  In the case of the above-described embodiment, for example, the cylinder head cover (2) is provided with a case portion (33) opened upward at one end side in the vehicle width direction (Q) of the automobile, and the intake system member (3) Is provided with a lid portion (37) for closing the opening of the case portion, and an air cleaner chamber (34) connected to the resonator portion (26) is formed in the case portion closed by the lid portion. (See, for example, FIGS. 5 and 6). As a result, the main part of the intake system member and thus the entire engine can be further downsized in the vertical direction.

  As a blowby gas hose connection structure according to the present embodiment, for example, the blowby gas outflow portion (8) rises from the upper surface portion of the cylinder head cover (2) at a height equal to or higher than the bulge portion (7). The upper part is provided with a raised part (18) provided with a connecting part (17), and an oil separating mechanism (20, 20A, 20) for separating oil contained in blow-by gas flowing in the inner space is provided in the inner space of the raised part. 20B) (see, for example, FIGS. 4, 9, and 10).

  In the case of the above-mentioned form, for example, the raised portion (18) includes a cylindrical outer peripheral wall (18a) and a flange (18b) extending inward from the upper end of the outer peripheral wall, and an oil separation mechanism (20, 20A). 20B) can be provided with cylindrical ribs (21, 21A, 21B) extending downward from the inner peripheral end of the flange (see, for example, FIGS. 4, 9, and 10). Thereby, oil can be captured in a relatively narrow space surrounded by the outer peripheral wall, the flange, and the cylindrical rib, and the oil separation performance of blow-by gas is further enhanced. From the viewpoint of further improving the oil separation performance, the axial length (L) of the cylindrical rib (21A) is 30 to 70% (preferably 40 to 60) of the height (H) of the raised portion (18). %) Is preferable (for example, see FIG. 9). The oil separation mechanism (20B) further includes a plate-like rib (22B) connected to the inner peripheral surface of the outer peripheral wall (18a), the lower surface of the flange (18b), and the outer peripheral surface of the cylindrical rib (21B). It is preferable that a plurality of ribs are provided along the circumferential direction of the cylindrical rib (see, for example, FIG. 10).

  As a connection structure of the blow-by gas hose according to the present embodiment, for example, a fastening tool (31) for fastening the lower end portion is provided on the outer peripheral side of the lower end portion connected to the connection portion (17) of the blow-by gas hose (4). The form (for example, refer FIG.4, FIG.8 etc.) with which it is equipped can be mentioned.

  As a blowby gas hose connection structure according to the present embodiment, for example, the engine is a front engine, and the blowby gas outflow part (8) is behind the bulging part (7) in the longitudinal direction (P) of the automobile. The intake system member (3) covers the bulging portion (7) from above, and the intake system member (3) and the bulging portion (7) are disposed between the engine room of the automobile. The form (for example, refer FIGS. 1-3) etc. which the space (S3) which can visually recognize the lower end part of a blowby gas hose (4) from the front can be mentioned.

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In the present embodiment, a horizontally installed front engine along the vehicle width direction is exemplified as an automobile engine. Moreover, the code | symbol P, Q, R in a figure shows the vehicle front-back direction P, the vehicle width direction Q, and the vehicle up-down direction R in the state which mounted the engine in the engine room, respectively.

(1) Structure of blowby gas hose connection structure The blowby gas hose connection structure 1 according to this embodiment connects a cylinder head cover 2 and an intake system member 3 constituting an automobile engine, as shown in FIGS. A blow-by gas hose 4 is provided. The intake system member 3 is mounted on the cylinder head cover 2 to constitute a cylinder head cover assembly 5.

  As shown in FIG. 3, the cylinder head cover 2 extends in the vehicle width direction Q and is formed in a box shape with the lower part opened. A bulging portion 7 is formed on the upper surface of the cylinder head cover 2 so as to form a separation space S1 for separating oil in blow-by gas generated in the engine. A blow-by gas outflow portion 8 in which a continuous blow-by gas outflow path S2 is formed is provided so as to protrude upward (see FIG. 5).

  The said bulging part 7 is extended along the vehicle width direction Q, and is formed in the box shape opened below. Further, the blow-by gas outflow portion 8 extends in the vehicle vertical direction R and is formed in a pipe shape that opens in the vertical direction R. The blow-by gas outflow portion 8 is disposed adjacent to the rear of the bulging portion 7 in the vehicle longitudinal direction P. A baffle plate 9 is provided on the back side of the cylinder head cover 2 so as to cover the lower openings of the bulging portion 7 and the blow-by gas outflow portion 8. A separation space S <b> 1 is formed between the baffle plate 9 and the cylinder head cover 2. The baffle plate 9 is formed with an oil return hole 10 for returning the oil separated in the separation space S1 to the engine side.

  As shown in FIG. 7, the separation space S <b> 1 is formed in a substantially U-shaped plane by ribs 12 projecting downward from the back surface of the cylinder head cover 2 and ribs 13 projecting upward from the upper surface of the baffle plate 9. Has been. One end side of the separation space S <b> 1 is connected to a communication hole 14 formed on the outer peripheral side of the cylinder head cover 2, and the other end side is connected to the blow-by gas outflow portion 8. The communication hole 14 is in communication with a blow-by gas flow path (not shown) continuous in the crankcase of the engine.

  As shown in FIG. 4, a pipe-like connection portion 17 to which the lower end portion of the blowby gas hose 4 extending from the intake system member 3 is connected is provided on the upper end side of the blowby gas outflow portion 8. The connecting portion 17 is disposed above the upper surface of the bulging portion 7. Further, the blow-by gas outflow portion 8 includes a raised portion 18 that rises from the upper surface portion of the cylinder head cover 2 at the same height as the height H of the bulging portion 7 and is provided with a connection portion 17 on the upper portion thereof. The raised portion 18 includes a cylindrical outer peripheral wall 18a and a flange 18b extending inward from the upper end of the outer peripheral wall 18a. A connecting portion 17 is raised on the flange 18b. In addition, an oil separation mechanism 20 that separates oil contained in blow-by gas flowing through the internal space is provided in the internal space of the raised portion 18 (that is, the blow-by gas outflow passage S2). The oil separation mechanism 20 includes a cylindrical rib 21 that extends downward from the inner peripheral end of the flange 18 b of the raised portion 18. The axial length L of the cylindrical rib 21 is set to a value of about 30% of the height H of the raised portion 18.

  As shown in FIG. 3, the intake system member 3 is provided integrally with the blowby gas passage portion 25 to which the upper end portion of the blowby gas hose 4 is connected, and the blowby gas passage portion 25. And a flat resonator unit 26 for covering (see FIG. 6). The blow-by gas passage portion 25 extends along the planar direction of the resonator portion 26. Moreover, the one end side of the blowby gas passage part 25 is formed in a substantially L shape, and serves as a connection part 25a to which the upper end part of the blowby gas hose 4 is connected. Further, one end side of a connecting pipe 27 connected to an intake passage (not shown) is connected to the other end side of the blowby gas passage portion 25. Moreover, the resonator part 26 is formed in the flat bag shape which covers the bulging part 7 and the blow-by gas outflow part 8 from upper direction. A space S3 is formed between the bulging portion 7 and the resonator portion 26 so that the upper end portion and the lower end portion of the blow-by gas hose 4 can be seen from the front of the engine room of the automobile. The resonator unit 26 performs a function of reducing intake noise of air flowing through the intake passage.

  As shown in FIG. 4, the blow-by gas hose 4 has an upper end connected to the connection part 25 a of the blow-by gas passage part 25, and a lower end connected to the connection part 17 of the blow-by gas outflow part 8. . Specifically, the blow-by gas hose 4 is made of an elastic material such as rubber, and an upper end portion thereof is press-fitted into the outer peripheral side of the connection portion 25 a and a lower end portion thereof is press-fitted into the outer peripheral side of the connection portion 17. . And the fastening tool 31 which fastens each edge part is each provided in the outer peripheral side of the upper end part of the blowby gas hose 4, and a lower end part. Each of these fasteners 31 includes a coil-shaped linear body 31a capable of expanding the diameter, and an operation portion 31b provided at both ends of the linear body 31a to expand the diameter of the linear body 31a (see FIG. 8). And the operation part 31b of each fastening tool 31 is arrange | positioned above the bulging part 7 as desired in the above-mentioned space S3.

  Here, as shown in FIG. 5, the cylinder head cover 2 is provided with a case portion 33 having an upper opening on one end side in the vehicle width direction Q. An air cleaner chamber 34 is formed in the case portion 33 by closing the opening of the case portion 33 with a lid portion 37 which will be described later of the intake system member 3 (see FIG. 2). The air cleaner chamber 34 is connected to the internal space of the resonator unit 26 of the intake system member 3. Further, a filter element (not shown) is accommodated in the air cleaner chamber 34. Further, an inflow port 35 through which air flows into the air cleaner chamber 34 is formed on the side surface of the case portion 33. One end of an intake pipe 36 extending in the vehicle width direction Q is connected to the inflow port 35 (see FIG. 2). Further, as shown in FIG. 6, a lid portion 37 that closes the case portion 33 is provided at a position adjacent to the resonator portion 26 of the intake system member 3. The lid portion 37 is formed in a box shape having an opening at the bottom. A tubular outflow port 38 through which air flows out from the air cleaner chamber 34 is formed on the side surface of the lid portion 37.

  In addition, the clamp tool 41 which can be engaged with the cover part 37 is provided in the outer peripheral side of the said case part 33 (refer FIG. 5). Further, a clamp tool 42 that can be engaged with the case portion 33 is provided on the outer peripheral side of the lid portion 37 (see FIG. 6). The intake system member 3 is mounted on the cylinder head cover 2 by attaching the lid portion 37 to the case portion 33 by the engagement of the clamp tools 41 and 42.

(2) Operation of Blowby Gas Hose Connection Structure Next, the operation of the blowby gas hose connection structure 1 having the above configuration will be described. During assembly and maintenance of the engine, as shown in FIG. 3, the blow-by gas hose 4 is connected from the front of the engine room of the automobile through a space S3 formed between the bulging part 7 and the resonator part 26. In addition, the tightening state of each tightening tool 31 is visually confirmed. The confirmation contents of the tightening tool 31 include, for example, the height position of the tightening tool 31 in the axial direction of the blow-by gas hose 4 and the angular position of the operation portion 31 b of the tightening tool 31 around the axis of the blow-by gas hose 4.

  In addition, when the engine is in operation, as indicated by broken line arrows in FIG. 2, the air filtered in the air cleaner chamber 34 through the intake pipe 36 passes to the intake side of the engine via a throttle valve and an intake manifold not shown. Supplied. Further, when the engine is under a high load, blow-by gas generated in the crankcase is introduced into the separation space S1 through the communication hole 14 as shown by a broken line arrow in FIG. The oil is separated and introduced into the blow-by gas outflow path S2 of the blow-by gas outflow portion 8.

  The blow-by gas introduced into the blow-by gas outflow passage S2 is in a space surrounded by the outer peripheral wall 18a, the flange 18b, and the cylindrical rib 21 in the raised portion 18, as indicated by broken line arrows in FIG. The oil is separated by flowing and colliding with each wall surface. The blow-by gas from which the oil has been separated flows in order through the blow-by gas hose 4 and the blow-by gas passage portion 25 and is supplied to the intake passage. When the engine is under a low load, the air flowing in the intake passage flows through the blow-by gas passage 25, the blow-by gas hose 4, the blow-by gas outflow portion 8 and the separation space S1 in this order, thereby improving the air purification performance in the crankcase. .

(3) Effects of the Embodiment According to the blowby gas hose connection structure 1 of the present embodiment, the upper surface of the cylinder head cover 2 is provided with a swell for forming a separation space S1 for separating oil in the blowby gas generated in the engine. The outlet 7 is provided so as to bulge upward, and a blow-by gas outlet 8 in which a blow-by gas outlet S2 connected to the separation space S1 is formed is provided so as to protrude upward. The intake system member 3 is mounted on the cylinder head cover 2 so as to cover the blow-by gas outflow portion 8 from above, and a blow-by gas hose 4 extending from the intake system member 3 is disposed on the upper end side of the blow-by gas outflow portion 8. A connecting portion 17 to which the lower end portion is connected is provided, and the connecting portion 17 is disposed above the upper surface of the bulging portion 7. As a result, even if the intake system member 3 is mounted on the cylinder head cover 2, the connection state of the blow-by gas hose 4 can be easily visually confirmed through the space S3 above the bulging portion 7 in the engine room of the automobile. Can be confirmed. As a result, the load of confirmation work during engine assembly and maintenance is greatly reduced. Furthermore, since the protruding height of the blow-by gas outflow portion 8 is increased, the space volume of the separation space S1 and the blow-by gas outflow path S2 is expanded, and the blow-by gas outflow path S2 having a relatively small cross-sectional area is provided. The flow rate of the flowing blow bar gas is increased. As a result, the oil separation performance of blow-by gas can be improved. Further, the blow-by gas hose 4 can be easily attached to and detached from the connection part 17 of the blow-by gas outflow part 8 and the fastening tool 31 can be easily attached to and detached from the blow-by gas hose 4 during assembly and maintenance of the engine.

  In the present embodiment, the intake system member 3 includes a blow-by gas passage portion 25 and a flat resonator portion 26. As a result, the visibility from above is further reduced by the flat resonator 26, but in the engine room of the automobile, the connection state of the blow-by gas hose 4 is visually observed via the space S3 above the bulge 7. Easy to confirm. Furthermore, since the blow-by gas outflow part 8 is covered with the relatively thin and flat resonator part 26, the main part of the intake system member 3 and the entire engine can be made compact in the vertical direction. On the other hand, in the conventional blow-by gas hose connection structure 101, as shown in FIG. 12, the blow-by gas outflow part 108 is covered with a relatively thick intake duct 103a, so that the main part of the intake system member 103 and the engine as a whole are covered. Becomes higher in the vertical direction. In addition, the code | symbol 126 in FIG. 11 shows a resonator part.

  Further, in the present embodiment, the cylinder head cover 2 is provided with a case portion 33 that opens upward on one end side in the vehicle width direction Q of the automobile, and the intake system member 3 has a lid that closes the case portion 33. A portion 37 is provided, and an air cleaner chamber 34 connected to the resonator portion 26 is formed in the case portion 33 closed by the lid portion 37. As a result, the main part of the intake system member 3 and thus the entire engine can be further downsized in the vertical direction.

  Further, in this embodiment, the blow-by gas outflow portion 8 includes a raised portion 18 that rises from the upper surface portion of the cylinder head cover 2 at a height equal to or higher than the height of the bulging portion 7 and is provided with a connection portion 17 on the upper portion thereof. An oil separation mechanism 20 is provided in the internal space of the raised portion 18. Thereby, an effective oil separation action can be exhibited in the blow-by gas outflow portion 8, and the internal space of the raised portion 18 for ensuring the visibility of the connection state of the blow-by gas hose 4 can be more effectively utilized.

  In the present embodiment, the raised portion 18 includes a cylindrical outer peripheral wall 18a and a flange 18b extending inwardly from the upper end of the outer peripheral wall 18a, and the oil separation mechanism 20 extends downward from the inner peripheral end of the flange 18b. A cylindrical rib 21 is provided. Thereby, oil can be captured in a relatively narrow space surrounded by the outer peripheral wall 18a, the flange 18b, and the cylindrical rib 21, and the oil separation performance of blow-by gas is further enhanced.

  Further, in this embodiment, a fastening tool 31 for fastening the lower end portion is provided on the outer peripheral side of the lower end portion connected to the connection portion 17 of the blow-by gas hose 4. Thereby, the tightening state of the tightening tool 31 as well as the connection state of the blow-by gas hose 4 can be easily confirmed visually.

  Further, in this embodiment, the engine is a front engine, the blow-by gas outflow portion 8 is disposed behind the bulging portion 7 in the front-rear direction P of the automobile, and the intake system member 3 is the bulging portion 7. A space S3 is formed between the intake system member 3 and the bulging portion 7 so that the lower end portion of the blow-by gas hose 4 can be seen from the front of the engine room of the automobile. Thereby, the connection state of the blowby gas hose 4 can be easily confirmed visually from the front of the engine room of the automobile.

<Modification 1>
Next, the connection structure of the blow-by gas hose according to Modification 1 of the above embodiment will be described. However, the same reference numerals are assigned to substantially the same components as the connection structure 1 of the blow-by gas hose according to the above-described embodiment, and the detailed description is omitted. The oil separation mechanism which is the difference between the two will be described in detail.

  In the blowby gas hose connection structure 1A of the first modification, as shown in FIGS. 9A and 9B, the internal space of the raised portion 18 is oil that separates oil contained in blowby gas flowing through the internal space. A separation mechanism 20A is provided. The oil separation mechanism 20A includes a cylindrical rib 21A that extends downward from the inner peripheral end of the flange 18b of the raised portion 18. The axial length L of the cylindrical rib 21A is about 50% of the height H of the raised portion 18.

  According to the blowby gas hose connection structure 1A of the first modified example, in addition to having substantially the same operation and effect as the blowby gas hose connection structure 1 of the above embodiment, the oil separation mechanism 20A is provided with the flange 18b of the raised portion 18. A cylindrical rib 21A extending downward from the inner peripheral end is provided, and the axial length L of the cylindrical rib 21A is about 50% of the height H of the raised portion 18. The length in the axial direction is increased, and the area of the wall surface where blow-by gas collides is increased. Therefore, the oil separation performance of blow-by gas is further enhanced.

<Modification 2>
Next, the blowby gas hose connection structure according to the second modification of the above embodiment will be described. However, the same components as the blowby gas hose connection structure 1 according to the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The oil separation mechanism which is the difference between the two will be described in detail.

  In the blowby gas hose connection structure 1B of the second modified example, as shown in FIGS. 10A and 10B, the oil contained in the blowby gas flowing through the internal space is separated into the internal space of the raised portion 18. A separation mechanism 20B is provided. The oil separation mechanism 20B is connected to the cylindrical rib 21B extending downward from the inner peripheral end of the flange 18b of the raised portion 18, the inner peripheral surface of the outer peripheral wall 18a, the lower surface of the flange 18b, and the outer peripheral surface of the cylindrical rib 21B. A plate-like rib 22B. A plurality (six in the figure) of the plate-like ribs 22B are provided along the circumferential direction of the cylindrical rib 21B.

  According to the blowby gas hose connection structure 1B of the second modified example, in addition to having substantially the same operation and effect as the blowby gas hose connection structure 1 of the above embodiment, the oil separation mechanism 20B is provided with the flange 18b of the raised portion 18. A cylindrical rib 21B extending downward from the inner peripheral end; and a plate-like rib 22B connected to the inner peripheral surface of the outer peripheral wall 18a, the lower surface of the flange 18b, and the outer peripheral surface of the cylindrical rib 21B. Since a plurality of cylindrical ribs 21B are provided along the circumferential direction, the space surrounded by the outer peripheral wall 18a, the flange 18b, and the cylindrical rib 21B is partitioned into a plurality of spaces by the plate-like ribs 22B. Therefore, since the area of the wall surface where blow-by gas collides increases, the oil separation performance of blow-by gas is further enhanced.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above-described embodiment, the intake system member 3 that covers the bulging portion 7 together with the blow-by gas outflow portion 8 is illustrated, but is not limited to this, for example, only the blow-by gas outflow portion 8 is covered and the bulging portion 7 is An air intake system member that is not covered may be used.

  Moreover, in the said Example, although the intake system member 3 provided with the resonator part 26 which covers the blowby gas outflow part 8 was illustrated, it is not limited to this, For example, the intake duct 103a (refer FIG. 12) which covers the blowby gas outflow part 8 ). In this case, for example, the upper end portion of the blow-by gas hose 4 is connected to the intake duct 103a.

  In the above embodiment, the upper end portion of the blow-by gas hose 4 is connected to a portion of the intake system member 3 immediately above the connection portion 17 (specifically, the connection portion 25a of the blow-by gas passage portion 25). For example, the upper end portion of the blow-by gas hose 4 may be connected to a portion of the intake system member 3 other than directly above the connection portion 17. In this case, the blow-by gas hose 4 is bent or curved and extends in the vertical direction, for example.

  Furthermore, in the said Example, although the oil separation mechanism 20 provided with the cylindrical rib 21 was illustrated, it is not limited to this, For example, it is set as an oil separation mechanism provided with the baffle wall which distribute | circulates blowby gas in a meandering manner, or blow-by gas An oil separation mechanism including a centrifugal separation chamber that circulates in a spiral shape may be used.

  Furthermore, in the said Example, although the front engine was illustrated as an engine for motor vehicles, it is not limited to this, For example, it is good also as a rear engine and a midship engine. Further, it may be a vertically mounted engine along the vehicle longitudinal direction P.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  The present invention is widely used as a technique for supplying blow-by gas generated in an automobile engine to an intake system member via a cylinder head cover.

  1, 1A, 1B; Blow-by gas hose connection structure, 2; Cylinder head cover, 3; Intake system member, 4; Blow-by gas hose, 7; Expansion part, 8; Blow-by gas outflow part; , 20, 20A, 20B; oil separation mechanism, 25; blow-by gas passage part, 26; resonator part, 31; fastener, S1; separation space, S2; blow-by gas outflow path, S3; space.

Claims (5)

A connection structure of a blow-by gas hose that connects a cylinder head cover of an automobile engine and an intake system member,
A bulge portion for forming a separation space for separating oil in blow-by gas generated in the engine is provided on the upper surface portion of the cylinder head cover so as to bulge upward, and a blow-by portion connected to the separation space. A blow-by gas outflow part in which a gas outflow path is formed is provided protruding upward,
The intake system member is mounted on the cylinder head cover so as to cover the blow-by gas outflow portion from above,
On the upper end side of the blow-by gas outflow portion, a connection portion to which the lower end portion of the blow-by gas hose extending from the intake system member is connected is provided,
The connection structure of the blow-by gas hose characterized by the above-mentioned. The said connection part is arrange | positioned above the upper surface of the said bulging part.   The intake system member includes: a blow-by gas passage portion to which an upper end portion of the blow-by gas hose is connected; and a flat resonator portion provided at an upper portion of the blow-by gas passage portion and covering the blow-by gas passage portion. The blowby gas hose connection structure according to 1. The blow-by gas outflow portion includes a raised portion that rises from the upper surface portion of the cylinder head cover at a height that is equal to or higher than the height of the bulging portion, and is provided with the connection portion on the upper portion.
The blow-by gas hose connection structure according to claim 1 or 2, wherein an oil separation mechanism for separating oil contained in blow-by gas flowing through the internal space is provided in the internal space of the raised portion.   The blowby gas hose connection structure according to any one of claims 1 to 3, wherein a fastening tool for fastening the lower end portion is provided on an outer peripheral side of the lower end portion connected to the connection portion of the blowby gas hose. . The engine is a front engine;
The blow-by gas outflow portion is disposed behind the bulging portion in the front-rear direction of the automobile,
The intake system member covers the bulging portion from above,
The space which can visually recognize the lower end part of the above-mentioned blowby gas hose from the front of the engine room of the above-mentioned car is formed between the above-mentioned intake system member and the above-mentioned bulging part. The blowby gas hose connection structure described.

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