JP6620650B2 - Insulated port parts for internal combustion engines - Google Patents

Description

  The present invention relates to a heat insulation port component for an internal combustion engine, and more particularly to a heat insulation port component for an internal combustion engine attached to an intake manifold side of an intake port in a cylinder head.

  As a conventional intake port structure of an internal combustion engine, various techniques for imparting a heat insulation effect to intake air flowing in an intake port of a cylinder head have been proposed (see, for example, Patent Documents 1 to 3). Patent Documents 1 and 2 disclose a technique in which a heat insulating port liner made of ceramic or resin is inserted into an intake port of a cylinder head and the heat insulating port liner is held between the cylinder head and the intake manifold. Patent Document 3 discloses a technique in which one end of a resin intake port member is bonded to a cylinder head, and the end of the intake manifold hole is brought into contact with the other end of the intake port member.

JP-A-11-229956 JP 2004-204796 A JP 2011-94515 A

  However, in the techniques disclosed in Patent Documents 1 and 2, since the heat insulation port liner is inserted into the intake port of the cylinder head later, the shape restriction of the heat insulation port liner is large, and the engine performance may be impaired. high. In the techniques of Patent Documents 1 and 2, since a gap exists between the inner peripheral surface of the intake port and the outer peripheral surface of the heat insulating port liner, liquefied fuel tends to accumulate in the gap, resulting in poor combustion. There is a risk of causing. Furthermore, in the technique disclosed in Patent Document 3, since the end portion of the intake manifold hole is brought into contact with the other end side of the resin-made intake port member, the seal surface with the intake manifold becomes the resin surface. Therefore, the seal reliability with respect to the intake manifold is low.

  The present invention has been made in view of the above situation, and is excellent in the heat insulation of the intake air flowing in the intake port of the cylinder head and the seal reliability with respect to the intake manifold, the shape restriction of the heat insulation port liner is small, and the combustion failure It is an object of the present invention to provide a heat insulation port part for an internal combustion engine that can suppress the above.

In order to solve the above problem, the invention according to claim 1 is a heat insulation port part of an internal combustion engine attached to the intake manifold side of the intake port in the cylinder head, and is a resin heat insulation port constituting the intake port. A liner and a metal body integrally formed with the heat insulating port liner and fitted to a head fitting portion provided in the cylinder head, the metal body covering the entire outer peripheral surface of the heat insulating port liner. A cylindrical portion joined to the entire outer peripheral surface so as to be covered and inserted into the head fitting portion and fitted , and an end portion of the intake manifold connected to one end side in the axial direction of the cylindrical portion. A mounting seat that is in contact with the mounting portion, and the mounting seat is formed in a flange shape that extends to the inner peripheral side of the tubular portion, and is located upstream of the heat-insulating port liner in the intake air flow direction. And summarized in that it is bonded to the surface.
The invention according to claim 2 is the invention according to claim 1, wherein the cylindrical portion is fitted into the cylindrical head fitting portion raised from the surface side of the cylinder head. And
According to a third aspect of the present invention, in the second aspect of the present invention, the mounting seat includes a head flange provided at a distal end side of the head fitting portion and a manifold flange provided at an end portion of the intake manifold. The gist is that it is formed in a flange shape extending to the outer peripheral side of the cylindrical portion so as to be sandwiched between.
In order to solve the above problem, the invention according to claim 4 is a heat insulation port part of an internal combustion engine attached to the intake manifold side of the intake port in the cylinder head, and is a resin heat insulation port constituting the intake port. A liner and a metal body integrally formed with the heat insulating port liner and fitted in a head fitting portion provided in the cylinder head, the metal body covering an outer peripheral surface of the heat insulating port liner. A cylindrical portion joined to the outer peripheral surface, and a mounting seat that is connected to one end side in the axial direction of the cylindrical portion and that is in contact with an end portion of the intake manifold. is formed in a flange shape extending to the inner circumferential side of the cylindrical portion, wherein are joined to the end surface of the upstream side of the intake flow direction of the heat insulating ports liner, wherein the metal body, the outer peripheral side of the cylindrical portion And summarized in that a head portion to be fitted in succession and the concave formed on the surface side of the cylinder head in the head fitting portion.
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a curved surface through which intake air flows is formed downstream of the heat insulating port liner in the flow direction of intake air. This is the gist.

According to the heat insulation port part of the internal combustion engine of the present invention, the resin heat insulation port liner constituting the intake port, and the metal body integrally formed with the heat insulation port liner and fitted to the head fitting portion provided in the cylinder head And comprising. The metal body is attached to the cylindrical portion joined to the outer peripheral surface so as to cover the outer peripheral surface of the heat insulating port liner, and to the one end side in the axial direction of the cylindrical portion and the end portion of the intake manifold is in contact And a seat. Further, the mounting seat is formed in a flange shape extending to the inner peripheral side of the cylindrical portion, and is joined to the upstream end surface of the heat insulating port liner in the intake air flow direction.
Thus, a heat insulating effect is imparted to the intake air flowing in the intake port of the cylinder head by the resin heat insulating port liner. As a result, knock resistance is improved. Further, since the end portion of the intake manifold is brought into contact with the mounting seat of the metal body, the seal surface with the intake manifold is a metal surface. Therefore, the seal reliability with respect to the intake manifold is improved. Further, since the heat insulating port component is attached to the cylinder head by fitting the metal body to the head fitting portion of the cylinder head, the heat insulating port liner is not directly attached to the cylinder head. Therefore, the shape restriction of the heat insulating port liner is small, and it is possible to suppress a decrease in engine performance. Further, by integrally molding, the cylindrical portion of the metal body is joined to the outer peripheral surface of the heat insulation port liner, and the mounting seat of the metal body is joined to the end face of the heat insulation port liner, so the heat insulation port liner and the metal body The interfacial gap is reduced or substantially eliminated. Therefore, it is difficult for liquefied fuel to accumulate in the intake port, and combustion failure is suppressed.
Further, when the cylindrical portion is fitted into the cylindrical head fitting portion raised from the surface side of the cylinder head, a sufficient heat insulating area of the heat insulating port liner can be secured, and a metal body A sufficient fitting area between the cylinder head and the cylinder head, that is, a sealing area can be secured.
Further, when the mounting seat is formed in a flange shape extending to the outer peripheral side of the cylindrical portion so as to be sandwiched between the head flange and the manifold flange, the seal reliability for the cylinder head and the intake manifold is improved. Is further improved.
Further, when the metal body includes a head portion that is connected to the outer peripheral side of the cylindrical portion and is fitted in the concave head fitting portion formed on the surface side of the cylinder head, The amount of protrusion from the surface side of the cylinder head can be reduced.
Further, when a curved surface through which intake air flows is formed on the downstream side in the intake flow direction of the heat insulating port liner, the heat insulating port liner can be formed deeper than the intake port, so that the heat insulating property of the intake air is further increased. Enhanced.

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 principal part longitudinal cross-sectional view of a cylinder head provided with the heat insulation port component which concerns on Example 1. FIG. It is explanatory drawing for demonstrating the said heat insulation port components, (a) shows the perspective view seen from the one end side, (b) shows the perspective view seen from the other end side, (c) is a longitudinal cross-sectional view Indicates. It is explanatory drawing for demonstrating the attachment method of the said heat insulation port components. It is a principal part longitudinal cross-sectional view of a cylinder head provided with the heat insulation port component which concerns on Example 2. FIG. It is explanatory drawing for demonstrating the said heat insulation port components, (a) shows the perspective view seen from the one end side, (b) shows the perspective view seen from the other end side, (c) is a longitudinal cross-sectional view Indicates. It is a principal part longitudinal cross-sectional view of a cylinder head provided with the heat insulation port component which concerns on Example 3. FIG. It is explanatory drawing for demonstrating the said heat insulation port components, (a) shows a perspective view, (b) shows a longitudinal cross-sectional view. It is explanatory drawing for demonstrating the attachment method of the said heat insulation port components.

  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.

<Insulated port parts for internal combustion engines>
The heat insulation port component (1, 1, 32) of the internal combustion engine attached to the intake manifold (16, 46) side of the intake port (3, 33) in the cylinder head (2, 32) is the heat insulation port component of the internal combustion engine according to the present embodiment. ', 31), a heat insulating port liner made of resin (11, 11', 41) constituting the intake port, and a head fitting portion (5, 35) (see, for example, FIGS. 1 to 8). And the said metal body (12, 42) and the cylindrical part (12a, 42a) joined to the outer peripheral surface (11a, 41a) so that the outer peripheral surface of a heat insulation port liner (11, 11 ', 41) may be covered. And mounting seats (12b, 42b) that are connected to one end side in the axial direction of the cylindrical portion and are in contact with the end portions of the intake manifolds (16, 46) (for example, FIG. 1, FIG. 4, and FIG. 6). Etc.). Furthermore, the mounting seats (12b, 42b) are formed in a flange shape extending to the inner peripheral side of the cylindrical portions (12a, 42a), and the intake air flow direction (P, P) of the heat insulating port liners (11, 11 ′, 41). ) On the upstream end face (11b, 41b).

  As the heat insulation port part of the internal combustion engine according to the present embodiment, for example, the cylindrical part (12a) is in a cylindrical head fitting part (5) raised from the surface side of the cylinder head (2). The form (for example, refer FIG. 3 etc.) fitted can be mentioned.

  As the heat insulation port part of the internal combustion engine according to the present embodiment, for example, the mounting seat (12b) includes a head flange (5a) provided on the front end side of the head fitting portion (5) and an intake manifold (16). Form formed in a flange shape extending to the outer peripheral side of the tubular portion (12a) so as to be sandwiched between the manifold flange (16a) provided at the end (see, for example, FIGS. 1 and 4) ).

  In the case of the above-described embodiment, for example, the mounting seat (12b) can be fastened together with the manifold flange (16a) and the fastening bolt (19) with respect to the head flange (5a) (see, for example, FIG. 3 and the like). ). Thereby, the sealing reliability with respect to an intake manifold and a cylinder head is further improved.

  In the case of the above-mentioned form, for example, on the contact surface side of the mounting seat (12b) with the head flange (5a), a gasket (17) for sealing the cylinder head (2) is mounted. A mounting groove (18) can be formed (see, for example, FIGS. 2 and 5). Thereby, the sealing reliability with respect to the cylinder head is further improved.

  As a heat insulation port part of the internal combustion engine according to the present embodiment, for example, the metal body (42) is connected to the outer peripheral side of the cylindrical portion (42a) and has a concave shape formed on the surface side of the cylinder head (32). The form (For example, refer FIG. 8 etc.) provided with the head part (42c) fitted in a head fitting part (35) can be mentioned.

  As a heat insulation port part of the internal combustion engine according to the present embodiment, for example, on the downstream side of the intake flow direction (P) of the heat insulation port liner (11 ′, 41), curved surfaces (25, 55) through which intake air flows. (For example, see FIGS. 5 and 7).

<Intake port structure of internal combustion engine>
The intake port structure of the internal combustion engine according to the present embodiment has a heat insulation port component (1, 1, 46) on the intake manifold (16, 46) side of the intake port (3, 33) in the cylinder head (2, 32). ', 31) is attached (see, for example, FIGS. 1 to 8).

  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.

<Example 1>
(1) Configuration of Heat Insulating Port Part As shown in FIGS. 1 and 3, the heat insulating port part 1 of the internal combustion engine according to this embodiment includes an intake port 3 intake in a cylinder head 2 made of metal such as aluminum alloy or cast iron. It is attached to the manifold 16 side. The cylinder head 2 is provided with a cylindrical head fitting portion 5 on its surface side. A head flange 5 a that extends to the outer peripheral side of the head fitting portion 5 is formed on the front end side of the head fitting portion 5. Further, on the surface side of the cylinder head 2, a boss 6 for inserting a fastening bolt 19 described later is erected so as to be continuous with the head flange 5a (see FIG. 3). Further, a port 9 constituting the intake port 3 is formed in the cylinder head 2 together with a heat insulating port liner 11 described later. An intake valve 7 for opening and closing the intake port 3 is provided in the cylinder head 2. Further, a water channel 8 through which cooling water flows is formed in the cylinder head 2.

  As shown in FIGS. 1 and 2, the heat insulation port component 1 includes a resin heat insulation port liner 11 constituting the intake port 3 and a metal integrally formed with the heat insulation port liner 11 (specifically, insert molding). And a body 12. That is, the heat insulating port liner 11 and the metal body 12 are integrally formed products. The heat insulating port liner 11 is formed in an elliptic cylinder shape that extends substantially straight along the flow direction P of intake air. In addition, the said heat insulation liner 11 can consist of resin excellent in heat resistance, such as poniphenylene sulfide (PPS), polyamide (PA), polybutylene terephthalate (PBT), for example. Further, the metal body 12 can be made of, for example, the same metal as the cylinder head 2 (for example, aluminum alloy, cast iron, etc.).

  The metal body 12 includes a cylindrical portion 12a and a mounting seat 12b that is connected to one end side in the axial direction of the cylindrical portion 12a. The cylindrical portion 12a is formed in an elliptical cylindrical shape that extends substantially straight along the axial direction. Moreover, the cylindrical part 12a is joined to the outer peripheral surface 11a so that the outer peripheral surface 11a of the heat insulation port liner 11 may be covered by integral molding. Further, the tubular portion 12 a is inserted into the head fitting portion 5 of the cylinder head 2 and can be fitted.

  The mounting seat 12b is formed in a flange shape extending to the outer peripheral side and the inner peripheral side of the cylindrical portion 12a so as to be sandwiched between the head flange 5a and the manifold flange 16a provided at the end of the intake manifold 16. Has been. And the part extended to the inner peripheral side of the cylindrical part 12a of the attachment seat 12b is joined to the end surface 11b of the upstream side of the inflow direction P of the heat insulation port liner 11 by integral molding.

  An annular mounting groove 18 in which a gasket 17 for sealing between the mounting head 12b and the head flange 5a is mounted is formed. The mounting groove 18 surrounds the outer periphery of the cylindrical portion 12a. The mounting seat 12b can be fastened together with the fastening flange 19 together with the manifold flange 16a with respect to the head flange 5a (see FIG. 3). An annular gasket 21 that seals between the manifold flange 16a and the mounting seat 12b is mounted on the contact surface side of the manifold flange 16a with the mounting seat 12b.

  The tubular portion 12a and the heat insulating port liner 11 are formed with a notch 23 that is notched from the downstream side in the intake flow direction P toward the upstream side. The notch 23 functions as a space for inserting an injector (also referred to as “fuel injection device”) 24 attached to the cylinder head 2.

(2) Method for Attaching Heat Insulating Port Part Next, a method for attaching the heat insulating port part 1 having the above configuration to the cylinder head 2 will be described. When the cylindrical portion 12 a is inserted and fitted into the head fitting portion 5 of the cylinder head 2, the heat insulating port component 1 is attached to the cylinder head 2. At this time, the head flange 5a is brought into contact with one surface of the mounting seat 12b, and the gap between the two 12b and 5a is sealed by the gasket 17. From this state, when the manifold flange 16a is brought into contact with the other surface of the mounting seat 12b, the gasket 21 seals between the two 12b and 16a. Thereafter, the fastening bolt 19 is inserted into the insertion holes and the insertion bosses 6 of the respective portions 16 a, 12 b and 5 a and screwed into the cylinder head 2, so that the heat insulating port part 1 and the intake manifold 16 are attached to the cylinder head 2. It is concluded.

  In the cylinder head 2 to which the heat insulating port component 11 is attached, the intake air sent from the intake manifold 16 and passing through the intake port 3 is effectively insulated by the heat insulating port liner 11 made of resin.

(3) Effects of Embodiment According to the heat insulation port component 1 of the internal combustion engine of this embodiment, the resin heat insulation port liner 11 constituting the intake port 3 and the heat insulation port liner 11 are integrally formed and provided in the cylinder head 2. A metal body 12 fitted to the head fitting portion 5 formed. The metal body 12 is connected to the cylindrical portion 12a joined to the outer peripheral surface 11a so as to cover the outer peripheral surface 11a of the heat insulating port liner 11, and the end of the intake manifold 16 connected to one end side in the axial direction of the cylindrical portion 12a. And a mounting seat 12b against which the part abuts. Further, the mounting seat 12b is formed in a flange shape extending to the inner peripheral side of the cylindrical portion 12a, and is joined to the upstream end surface 11b of the heat insulating port liner 11 in the intake air flow direction P.

  Thus, a heat insulating effect is imparted to the intake air flowing through the intake port 3 of the cylinder head 2 by the resin heat insulating port liner 11. As a result, knock resistance is improved. Further, since the end portion of the intake manifold 16 is brought into contact with the mounting seat 12b of the metal body 12, the seal surface with the intake manifold 16 is a metal surface. Therefore, the seal reliability with respect to the intake manifold 16 is improved. Further, since the heat insulating port component 1 is attached to the cylinder head 2 by fitting the metal body 12 to the head fitting portion 5 of the cylinder head 2, the heat insulating port liner 1 is directly attached to the cylinder head 2. Absent. Therefore, the shape restriction of the heat insulating port liner 11 is small, and a decrease in engine performance can be suppressed. Furthermore, the cylindrical part 12a of the metal body 12 is joined to the outer peripheral surface 11a of the heat insulation port liner 11 by integral molding, and the mounting seat 12b of the metal body 12 is joined to the end face 11b of the heat insulation port liner 11. The interface gap between the heat insulating liner 11 and the metal body 12 is reduced or substantially eliminated. Therefore, it is difficult for liquefied fuel to accumulate in the intake port 3, and combustion failure is suppressed. Furthermore, since the heat insulating port component 1 is separate from the cylinder head 2, the structure of the cylinder head 2 can be simplified and the productivity can be improved.

  In the present embodiment, the cylindrical portion 12 a is fitted into a cylindrical head fitting portion 5 raised from the surface side of the cylinder head 2. Thereby, while being able to ensure sufficient heat insulation area of the heat insulation port liner 11, the sufficient fitting area between the metal body 12 and the cylinder head 2, ie, a seal area, can be ensured.

  In the present embodiment, the mounting seat 12b is formed in a flange shape extending to the outer peripheral side of the tubular portion 12a so as to be sandwiched between the head flange 5a and the manifold flange 16a. Thereby, the sealing reliability with respect to the cylinder head 2 and the intake manifold 16 is further improved.

  Further, in this embodiment, the mounting seat 12b is fastened together with the fastening flange 19 together with the manifold flange 16a with respect to the head flange 5a. Thereby, the sealing reliability with respect to the cylinder head 2 and the intake manifold 16 is further improved. Further, in this embodiment, an annular mounting groove 18 in which a gasket 17 for sealing between the mounting head 12b and the cylinder head 2 is mounted is formed on the contact surface side of the mounting seat 12b with the head flange 5a. Thereby, the sealing reliability with respect to the cylinder head 2 is further improved.

<Example 2>
Next, a heat insulating port part according to the second embodiment will be described. In addition, in the heat insulation port component which concerns on this Example 2, the same code | symbol is attached | subjected to the substantially same component as the heat insulation port component 1 which concerns on the said Example 1, and detailed description is abbreviate | omitted.

(1) Configuration of Insulated Port Parts As shown in FIGS. 4 and 5, the insulated port part 1 ′ of the internal combustion engine according to this embodiment includes an intake port 3 in a cylinder head 2 made of metal such as aluminum alloy or cast iron. It is attached to the intake manifold 16 side. The heat insulation port component 1 ′ includes a resin heat insulation port liner 11 ′ constituting the intake port 3 and a metal body 12 integrally formed with the heat insulation port liner 11 ′. The metal body 12 includes a cylindrical portion 12a and a mounting seat 12b that is continuous with one end side in the axial direction of the cylindrical portion 12a.

  The heat insulating port liner 11 ′ is formed in an elliptic cylinder shape. The heat insulating port liner 11 ′ includes a straight portion 26 that extends substantially straight along the flow direction P of the intake air, and a flat-shaped enlarged portion 27 that continues to one end of the straight portion 26 and expands laterally toward the tip. And. A curved surface 25 through which intake air flows is formed on the inner peripheral side of the enlarged portion 27.

(2) Operation and effect of the embodiment According to the heat insulation port part 1 'of the internal combustion engine according to the present embodiment, the heat insulation port part 11' exhibits substantially the same operation and effect as the heat insulation port part 1 of the first embodiment. Since a curved surface 25 through which intake air flows is formed on the downstream side in the intake air flow direction P, the heat insulating port liner 11 'can be formed further to the deeper side of the intake port 3 to further enhance the heat insulating property of the intake air. .

<Example 3>
Next, a heat insulating port part according to the third embodiment will be described. In addition, in the heat insulation port component which concerns on this Example 3, the same code | symbol is attached | subjected to the substantially same component as the heat insulation port component 1 which concerns on the said Example 1, and detailed description is abbreviate | omitted.

(1) Configuration of Heat Insulating Port Part As shown in FIGS. 6 and 8, the heat insulating port part 31 of the internal combustion engine according to this embodiment is an intake port 33 intake in a cylinder head 32 made of metal such as aluminum alloy or cast iron. It is attached to the manifold 46 side. A concave head fitting portion 35 is formed on the surface side of the cylinder head 32. In addition, a port 39 constituting an intake port 33 is formed in the cylinder head 32 together with a heat insulating port liner 31 described later. An intake valve 7 and a water channel 8 are provided in the cylinder head 32.

  As shown in FIGS. 6 and 7, the heat insulation port component 31 includes a resin heat insulation port liner 41 constituting the intake port 33 and a metal body 42 integrally formed with the heat insulation port liner 41. . That is, the heat insulating port liner 11 and the metal body 12 are integrally formed products. In addition, the said heat insulation port liner 41 can consist of resin excellent in heat resistance, such as poniphenylene sulfide (PPS), polyamide (PA), polybutylene terephthalate (PBT), for example. Further, the metal body 42 can be made of, for example, the same metal as the cylinder head 32 (for example, aluminum alloy, cast iron, etc.).

  The heat insulating port liner 41 is formed in a substantially U-shaped longitudinal section. The heat insulating port liner 41 includes a straight portion 56 that extends substantially straight along the flow direction P of intake air, and a flat-shaped enlarged portion 57 that extends to one side of the straight portion 56 and expands laterally toward the tip. It is equipped with. A curved surface 55 through which intake air flows is formed on the inner peripheral side of the enlarged portion 57.

  The metal body 42 includes a cylindrical portion 42a, a mounting seat 42b continuous to one end side in the axial direction of the cylindrical portion 42a, and a head portion 42c continuous to the outer peripheral side of the cylindrical portion 42a. The cylindrical portion 42a is formed in an elliptical cylindrical shape that extends substantially straight along the axial direction. Moreover, the cylindrical part 42a is joined to the outer peripheral surface 41a so that the outer peripheral surface 41a of the heat insulation port liner 41 may be covered by integral molding.

  The mounting seat 42b is formed in a flange shape extending on the inner peripheral side of the tubular portion 42a so that a manifold flange 46a provided at the end of the intake manifold 46 is brought into contact with one surface. And the part extended to the inner peripheral side of the cylindrical part 42a of the mounting seat 42b is joined to the upstream end surface 42b of the heat-insulating port liner 41 in the intake air flow direction P by integral molding.

  The head portion 42 c can be fitted into the head fitting portion 35 of the cylinder head 32. An annular mounting groove 48 in which a gasket 47 that seals between the head portion 42c and the cylinder head 32 is mounted is formed on the bottom surface side of the head portion 42c. Further, an insertion boss 36 for the fastening bolt 49 is erected on the surface side of the head portion 42c (see FIG. 8). Further, a hole-like mounting portion 53 to which an injector (also referred to as “fuel injection device”) 54 is mounted is formed on the surface side of the head portion 42c. An annular gasket 51 that seals between the manifold seat 46b and the mounting seat 42b is mounted on the surface of the manifold flange 46a that contacts the mounting seat 42b.

  In the present embodiment, the heat insulating port part 31 having an integrated structure in which the adjacent head parts 42c of the plurality of head parts 42c provided for each cylinder of the internal combustion engine are connected to each other is employed. However, the present invention is not limited to this. For example, a plurality of heat insulation port parts may be provided for each cylinder of the internal combustion engine.

(2) Method for Attaching Heat Insulating Port Part Next, a method for attaching the heat insulating port part 31 having the above configuration to the cylinder head 32 will be described. When the head portion 42 c is fitted into the head fitting portion 35 of the cylinder head 32, the heat insulating port component 31 is attached to the cylinder head 32. At this time, the bottom surface of the head fitting portion 35 is brought into contact with the bottom surface of the head portion 42 c, and the gap between both the surfaces 42 c and 35 is sealed by the gasket 47. From this state, when the manifold flange 46a is brought into contact with the surface of the mounting seat 42b, the gasket 51 seals between the two 42b and 46a. Thereafter, the fastening bolt 49 is inserted into the insertion hole of the manifold flange 46 a and the insertion boss 36 and screwed into the cylinder head 32, whereby the heat insulating port part 31 and the intake manifold 46 are fastened to the cylinder head 32. .

  In the cylinder head 32 to which the heat insulation port component 31 is attached, the intake air sent from the intake manifold 46 and passing through the intake port 33 is effectively insulated by the resin heat insulation port liner 41.

(3) Effects of the Embodiment According to the heat insulation port component 31 of the internal combustion engine of this embodiment, the resin heat insulation port liner 41 constituting the intake port 33 and the heat insulation port liner 41 are integrally formed and provided in the cylinder head 32. A metal body 42 to be fitted to the head fitting portion 35 formed. The metal body 42 is connected to the cylindrical portion 42a joined to the outer peripheral surface so as to cover the outer peripheral surface 41a of the heat insulating port liner 41, and is connected to one end side in the axial direction of the cylindrical portion 42a and the end portion of the intake manifold 46 And a mounting seat 42b against which the abutment comes into contact. Further, the mounting seat 42b is formed in a flange shape extending to the inner peripheral side of the cylindrical portion 42a, and is joined to the end face 41b on the upstream side in the intake air flow direction P of the heat insulating port liner 41.

  Thereby, a heat insulating effect is imparted to the intake air flowing through the intake port 33 of the cylinder head 32 by the resin heat insulating port liner 41. As a result, knock resistance is improved. Further, since the end portion of the intake manifold 46 is brought into contact with the mounting seat 42b of the metal body 42, the seal surface with the intake manifold 46 is a metal surface. Therefore, the seal reliability with respect to the intake manifold 46 is improved. Further, since the heat insulating port component 31 is attached to the cylinder head 32 by fitting the metal body 42 to the head fitting portion 35 of the cylinder head 32, the heat insulating port liner 41 is directly attached to the cylinder head 32. Absent. Therefore, the shape restriction of the heat insulating port liner 41 is small, and a decrease in engine performance can be suppressed. Furthermore, the cylindrical part 42a of the metal body 42 is joined to the outer peripheral surface 41a of the heat insulation port liner 41 by integral molding, and the mounting seat 42b of the metal body 42 is joined to the end face 41b of the heat insulation port liner 41. The interface gap between the heat insulating port liner 41 and the metal body 42 is reduced or substantially eliminated. Therefore, it is difficult for liquefied fuel to accumulate in the intake port 33 and combustion failure is suppressed. Furthermore, since the heat insulation port part 31 is a separate body from the cylinder head 33, the structure of the cylinder head 42 can be simplified and productivity can be improved.

  In the present embodiment, the metal body 42 includes a head portion 42 c that is connected to the outer peripheral side of the cylindrical portion 42 a and is fitted into a concave head fitting portion 35 formed on the surface side of the cylinder head 32. . Thereby, the protrusion amount from the surface side of the cylinder head 32 of the heat insulation port component 31 can be reduced.

  Further, in the present embodiment, a curved surface 55 through which the intake air flows is formed on the downstream side in the intake flow direction P of the heat insulating port liner 41. Thereby, since it can comprise with the heat insulation port liner 41 to the back | inner side of the intake port 33, the heat insulation of intake is further improved.

  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 first to third embodiments, the heat insulating port liners 11, 11 ′, 41 that constitute a part of the intake ports 3, 33 are illustrated, but the present invention is not limited to this. An insulated port liner that constitutes the above may be employed.

  In the first and second embodiments, the cylindrical portion 12a of the metal body 12 is inserted and fitted into the cylindrical head fitting portion 5 standing on the surface side of the cylinder head 2. For example, the cylindrical portion 12a of the metal body 12 may be inserted and fitted into a hole-like fitting portion formed on the surface side of the cylinder head 2.

  Furthermore, in the said Example 2, 3, although the heat insulation port liner 11 'provided with the flat expansion parts 27 and 57 in which the curved surfaces 25 and 55 were formed in the downstream was illustrated, it is not limited to this, You may employ | adopt the heat insulation port liner provided with the enlarged diameter part in which the curved surface was formed, a reduced diameter part, a curved part, etc. in a downstream.

  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 imparting a heat insulation effect to intake air flowing in an intake port of an internal combustion engine.

  1, 1 ', 31; Insulated port parts, 2, 32; Cylinder head, 3, 33; Intake port, 5, 35; Head fitting portion, 5a; Head flange, 11, 11', 41; 12, 42; Metal body, 12a, 42a; Cylindrical part, 12b, 42b; Mounting seat, 42c; Head part, 16, 46; Intake manifold, 16a; Manifold flange, 25, 55; Curved surface, P; Flow direction.

Claims (5)

A heat insulation port component of an internal combustion engine attached to the intake manifold side of the intake port in the cylinder head,
A heat insulating port liner made of resin constituting the intake port;
A metal body integrally formed with the heat insulating port liner and fitted in a head fitting portion provided in the cylinder head,
The metallic body is joined to the entire outer peripheral surface so as to cover the entire outer peripheral surface of the heat insulating port liner, and is inserted into and fitted into the head fitting portion. A mounting seat that is connected to one end side in the axial direction and that contacts the end of the intake manifold,
The heat insulating port of the internal combustion engine, wherein the mounting seat is formed in a flange shape extending to the inner peripheral side of the cylindrical portion, and is joined to an upstream end surface of the heat insulating port liner in the intake air flow direction. parts.   2. The heat insulation port part for an internal combustion engine according to claim 1, wherein the cylindrical portion is fitted into the cylindrical head fitting portion raised from the surface side of the cylinder head.   The mounting seat is provided on the outer peripheral side of the tubular portion so as to be sandwiched between a head flange provided on the front end side of the head fitting portion and a manifold flange provided on an end portion of the intake manifold. The heat insulation port part of the internal combustion engine according to claim 2, wherein the heat insulation port part is formed in an extending flange shape. A heat insulation port component of an internal combustion engine attached to the intake manifold side of the intake port in the cylinder head,
A heat insulating port liner made of resin constituting the intake port;
A metal body integrally formed with the heat insulating port liner and fitted in a head fitting portion provided in the cylinder head,
The metal body is connected to the cylindrical portion joined to the outer peripheral surface so as to cover the outer peripheral surface of the heat insulating port liner, and the end portion of the intake manifold is in contact with one end side in the axial direction of the cylindrical portion. And a mounting seat,
The mounting seat is formed in a flange shape that extends to the inner peripheral side of the cylindrical portion, and is joined to an upstream end surface of the heat-insulating port liner in the flow direction of intake air,
The heat insulation for an internal combustion engine, wherein the metal body includes a head portion that is connected to the outer peripheral side of the cylindrical portion and is fitted into the concave head fitting portion formed on the surface side of the cylinder head. Port parts.   The heat insulation port part of the internal combustion engine according to any one of claims 1 to 4, wherein a curved surface through which intake air flows is formed on a downstream side of the heat insulation port liner in a flow direction of intake air.

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