JP2016160797A - Internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine capable of improving manufacturability of a cylinder head by easily discharging sand in a sand core forming an exhaust passage upper water jacket.SOLUTION: A sand drain hole 98 communicated to an exhaust passage upper water jacket 95 is formed near an exhaust outlet 93 of a front wall portion of a cylinder head 11, sand of a sand core forming the exhaust passage upper water jacket 95 after casting of the cylinder head 11 is discharged through the sand drain hole 98, and the sand drain hole 98 is sealed after discharging the sand of the sand core. Further a projecting portion projecting from the front wall portion near the exhaust outlet 93 to mount an exhaust member 110, and a boss portion projecting from the front wall portion near the sand drain hole 98 and connected to the projecting portion are disposed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an internal combustion engine, and more particularly to an internal combustion engine that collects exhaust passages in a cylinder head.

  Some internal combustion engines include a collective exhaust passage that collects exhaust passages in a cylinder head. In this internal combustion engine, it is necessary to form a water jacket on the cylinder head so as to avoid the collective exhaust passage.

  Conventionally, an engine described in Patent Document 1 is known as an internal combustion engine having a cylinder head provided with a collective exhaust port. The thing of patent document 1 equips the cylinder head with the overhang | projection part which protrudes in an arch shape outside the side surface of a cylinder block. The collecting portion of the collecting exhaust passage is formed so as to face the inner surface of the side wall of the overhanging portion.

  In this internal combustion engine, a water jacket is formed on the upper and lower portions of the overhanging portion so as to avoid the collective exhaust passage, and no water jacket is formed on the side surface of the overhanging portion. Thereby, the conventional internal combustion engine can avoid the complicated shape of the sand core forming the water jacket.

JP 2000-161132 A

  In the above-described conventional internal combustion engine, the exhaust passage upper water jacket formed at the upper portion of the overhanging portion is thin because it is formed avoiding the collective exhaust passage. Further, the exhaust passage upper water jacket is separated from the combustion chamber side water jacket and is located at the upper end of the cylinder head. For this reason, the sand core sand forming the exhaust passage upper water jacket cannot be easily discharged. As a result, the manufacturability of the cylinder head is deteriorated.

  The present invention has been made paying attention to the above-mentioned problems, and improves the manufacturability of the cylinder head by easily discharging the sand core sand forming the exhaust passage upper water jacket. It is an object of the present invention to provide an internal combustion engine capable of

The present invention includes a cylinder head in which a plurality of combustion chambers are arranged in a cylinder row direction, a plurality of manifold passage portions formed in the cylinder head and respectively communicating with the plurality of combustion chambers, and the plurality of manifold passage portions. An exhaust passage for exhausting exhaust gas generated in the plurality of combustion chambers from the exhaust outlet, and a collecting passage portion that collects, and an exhaust outlet that opens to a side wall of the cylinder head at a central portion in the cylinder row direction. A combustion chamber-side water jacket into which cooling water for cooling the combustion chamber is introduced from the outside, and extends from the combustion chamber-side water jacket to the upper side of the collecting passage, and cooling water is introduced from the combustion chamber-side water jacket. An exhaust passage upper water jacket and an end portion of the cylinder head in the cylinder row direction, the combustion chamber side water jacket and the exhaust passage upper side jacket. A cooling water outlet through which the cooling water that has passed through the data jacket is discharged, and sand removal communicating with the upper water jacket on the exhaust passage in the vicinity of the exhaust outlet on the side wall of the cylinder head A hole is provided, and the sand core sand forming the exhaust passage upper water jacket after casting of the cylinder head is discharged through the sand hole, and the sand hole is sealed after the sand core is discharged. It is stopped.

  According to the present invention, since the sand removal hole is disposed in the side wall of the cylinder head in the vicinity of the exhaust outlet, the sand of the sand core forming the exhaust passage upper water jacket can be easily discharged through the sand removal hole. can do. As a result, the manufacturability of the cylinder head can be improved.

FIG. 1 is a diagram showing an embodiment of an internal combustion engine according to an embodiment of the present invention, and is a top view of the internal combustion engine. FIG. 2 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a top view of the cylinder head with the cylinder head cover removed. FIG. 3 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a perspective view of the cylinder head with the cylinder head cover removed. FIG. 4 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a front view of the cylinder head with the cylinder head cover removed. FIG. 5 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a cross-sectional view taken along a protruding portion of the cylinder head. FIG. 6 is a view showing an embodiment of an internal combustion engine according to an embodiment of the present invention, and is a perspective view of a water jacket of a cylinder head viewed from the front upper side of the vehicle. FIG. 7 is a diagram showing an embodiment of an internal combustion engine according to an embodiment of the present invention, and is a side view of a water jacket of a cylinder head viewed from the left side of the vehicle. FIG. 8 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a perspective view of a sand core forming a water jacket of a cylinder head.

  Embodiments of an internal combustion engine according to the present invention will be described below with reference to the drawings. 1 to 8 show an internal combustion engine according to an embodiment of the present invention.

  First, the configuration will be described. In FIG. 1, an engine 1 constituting an internal combustion engine of the present invention is a horizontal 4 that performs a series of four strokes including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke while a piston (not shown) reciprocates two cylinders. It consists of a cycle engine.

  The engine 1 is mounted on a vehicle, and the engine 1 includes a cylinder head 11 and a cylinder head cover 12. 1 to 8, front and rear, left and right, and upper and lower directions represent directions viewed from the driver's seat of the vehicle on which the engine 1 is mounted.

  The cylinder head 11 is attached to the upper part of a cylinder block (not shown). The cylinder block has a cylinder (not shown) that accommodates a piston (not shown) so as to be movable up and down, and the vertical movement of the piston is converted into a rotational movement of a crankshaft (not shown) provided in the cylinder block. The cylinder head 11 is manufactured by low pressure casting using a plurality of molds including a sand core 100 (see FIG. 8) described later.

1 and 2, the cylinder head 11 includes a rear side wall portion 31 and a front side wall portion 32 that extend in parallel to the vehicle width direction, and a vehicle side direction of the rear side wall portion 31 and the front side wall portion 32 that extends in the front-rear direction of the vehicle. A left side wall 33 that continues to one end (left end), and a right side wall 34 that extends in the front-rear direction of the vehicle and continues to the other end (right end) in the vehicle width direction of the rear side wall 31 and the front side wall 32 , Front side wall 32
And a bottom wall portion 35 (see FIG. 3) continuous to the lower portion of the left side wall portion 33 and the right side wall portion 34, and is configured by a rectangular parallelepiped case.

  In FIG. 2, a boss portion 16 that accommodates a spark plug 15 is formed at the center of the cylinder head 11, and the spark plug 15 includes a bottom surface of a bottom wall portion 35 of the cylinder head 11 and an upper portion of a cylinder of a cylinder block. It protrudes into the combustion chamber 90 formed by

  The engine 1 according to the embodiment is a four-cylinder direct injection gasoline engine having four spark plugs 15. Further, the left-right direction in which the combustion chambers 90 are arranged in the present embodiment is the cylinder row direction in the present invention.

  In FIG. 1, the cylinder head 11 is provided with a plurality of ignition coils 2 to be paired with the ignition plug 15, and the ignition coil 2 ignites the ignition plug 15.

  2 and 3, the cylinder head 11 is provided with an intake camshaft 13 and an exhaust camshaft 14 extending in parallel with the intake camshaft 13. In FIG. 2, the intake camshaft 13 and the exhaust camshaft 14 are rotatably supported by an upper cam housing 17 and a lower cam housing 18 that serve as bearings installed on the upper part of the cylinder head 11.

  A cam sprocket (not shown) is provided at the right ends of the intake camshaft 13 and the exhaust camshaft 14, and a timing chain (not shown) is wound around the cam sprocket. The timing chain is wound around a cranks plot (not shown) of the crankshaft, and the timing chain transmits the rotation of the crankshaft to the intake camshaft 13 and the exhaust camshaft 14.

  The intake camshaft 13 is provided with a plurality of intake cams 13A, and the intake cams 13A are in contact with a rocker arm (not shown).

  The lower surface of the arm tip on the other end side of the rocker arm is in contact with the upper end of the intake valve 21. The intake valve 21 is provided so as to advance and retreat in the axial direction with respect to the cylinder head 11. The intake valve 21 is moved in a direction to be pulled up by a valve spring (not shown), that is, a direction in which communication between the intake port 46 (see FIG. 1) opened and closed by the intake valve 21 and the combustion chamber 90 (see FIG. 2) is blocked. .

  When the rocker arm pushes down the intake valve 21 against the urging force of the valve spring by the rotation of the intake cam 13A, the intake port 46 and the combustion chamber 90 are communicated with each other. As described above, the intake valve 21 is moved forward and backward by the rotation of the intake cam 13A, so that the intake port 46 and the combustion chamber 90 are communicated and blocked.

  The exhaust camshaft 14 is provided with a plurality of exhaust cams 14A, and the exhaust cams 14A are in contact with the upper end of an exhaust valve (not shown) via a rocker arm (not shown). The exhaust cam 14A is in contact with the exhaust valve via a rocker arm (not shown) having the same configuration as that of the rocker arm, and is driven by the same valve operating structure as that of the intake side. Communicate and block.

  1 to 4, a fuel pump 41 and a fuel pump mounting bracket 42 are attached to the cylinder head 11. The fuel pump 41 is provided with a fuel supply pipe 44, and low pressure fuel is supplied to the fuel pump 41 from the fuel supply pipe 44.

The fuel pump 41 is provided with a fuel supply pipe 43, and the fuel adjusted by the fuel pump 41 is introduced into the fuel supply pipe 43.

  In FIG. 1, a delivery pipe 45 is provided in the cylinder head 11, and the delivery pipe 45 supplies the fuel introduced from the fuel supply pipe 43 to a fuel injection valve (not shown).

  The fuel injection valve is installed in each combustion chamber 90 (see FIG. 2) of the cylinder head 11, and the delivery pipe 45 distributes and supplies the high-pressure fuel introduced from the fuel supply pipe 43 to the fuel injection valve. The fuel injection valve directly injects the high-pressure fuel supplied from the delivery pipe 45 into the combustion chamber 90.

  In FIG. 1, a plurality of intake ports 46 are formed in the rear side wall portion 31, and each intake port 46 communicates with a cylinder. An intake manifold (not shown) is attached to the rear side wall 31, and the intake manifold distributes and introduces intake air purified by an air cleaner (not shown) to each intake port 46.

  3 and 4, an exhaust collecting passage 47 is formed in the front side wall portion 32. The exhaust collecting passage 47 communicates with each combustion chamber 90 (see FIG. 2). The exhaust gas introduced from the combustion chamber 90 into the exhaust collecting passage 47 is exhausted through the exhaust member 110 communicating with the exhaust collecting passage 47. The exhaust member 110 includes a catalyst device (not shown) that purifies exhaust gas or a turbine housing of a turbocharger. Here, the front side wall part 32 of this Embodiment comprises the side wall of this invention.

  In FIG. 4, the intake camshaft 13 is provided with a pump drive cam 13B, and the fuel pump 41 is driven by the pump drive cam 13B.

  The fuel pump 41 includes a pump body 51, a plunger, an electromagnetic valve, and a spring (not shown). The fuel pump 41 includes a connector 55 that electrically connects an electromagnetic valve and a controller (not shown).

  A bearing portion (not shown) on the left end side of the intake camshaft 13 is rotatably supported by the left side wall portion 33 and the fuel pump mounting bracket 42.

  The fuel pump mounting bracket 42 extends in the axial direction of the intake camshaft 13 and extends along the left side wall 33 from the first side wall 71 and the first side wall 71 attached to the upper surface of the rear side wall 31. The second side wall part 72 attached to the upper surface of the left side wall part 33 and a connection wall part (not shown) that connects the first side wall part 71 and the second side wall part 72 are configured.

  In FIGS. 1, 2, and 4, a vacuum pump 82 is attached to the second side wall 72 and the left side wall 33 of the fuel pump mounting bracket 42 via a case member 81. That is, the case member 81 of the present embodiment is provided between the vacuum pump 82 and the left side wall portion 33.

  The vacuum pump 82 is fixed to the second side wall portion 72 together with the case member 81. The lower end of the case member 81 is fixed to the left side wall 33 of the cylinder head 11 with a bolt 76F.

  The vacuum pump 82 is connected to the left end portion 13a of the intake camshaft 13 and is driven by the intake camshaft 13 to generate a negative pressure and supply the negative pressure to a brake booster or the like.

  A sensing rotor (not shown) is accommodated in the case member 81, and a plurality of projecting portions having different lengths in the circumferential direction are formed on the sensing rotor. A cam angle sensor (not shown) is provided at a position facing the sensing rotor, and the cam angle sensor detects the rotation angle of the sensing rotor.

  A cooling water passage and a thermostat (not shown) are provided in the lower part of the case member 81 in contact with the left side wall 33, and cooling that flows through a water jacket (described later) formed in the cylinder head 11 in the cooling water passage. Water is discharged.

  This cooling water passage is partitioned from a detection chamber (not shown) which is an internal space of the case member 81 in which the left end portion 13a of the intake cam shaft 13, the sensing rotor 61, and the cam angle sensor 62 are accommodated. Thereby, the cooling water does not flow from the cooling water passage to the detection chamber.

  3, 4, 6, and 7, an exhaust collecting passage 47 is formed in the cylinder head 11. The exhaust collecting passage 47 includes a plurality of manifold passage portions 91 communicating with the plurality of combustion chambers 90, a collecting passage portion 92 in which the plurality of manifold passage portions 91 gather together, and a front side wall of the cylinder head 11 at the center in the cylinder row direction. And an exhaust outlet 93 that opens to the portion 32.

  The exhaust collecting passage 47 joins the exhaust gases generated in the plurality of combustion chambers 90 and discharges them from the exhaust outlet 93. The exhaust collecting passage 47 of the present embodiment constitutes an exhaust passage in the present invention.

  Further, the cylinder head 11 is formed with a combustion chamber side water jacket 94 into which cooling water for cooling the combustion chamber 90 is introduced from the outside. A cooling water introduction hole 96 is provided in the combustion chamber side water jacket 94, and the cooling water that has passed through the water jacket of a cylinder block (not shown) passes through the cooling water introduction hole 96 to the combustion chamber side water jacket 94. be introduced.

  An exhaust passage upper water jacket 95 is formed in the cylinder head 11, and the exhaust passage upper water jacket 95 extends from the combustion chamber side water jacket 94 above the collecting passage portion 92. Cooling water is introduced into the exhaust passage upper water jacket 95 from the combustion chamber side water jacket 94.

  A cooling water outlet 97 is formed at the end of the cylinder head 11 in the cylinder row direction. The cooling water outlet 97 receives the cooling water that sequentially passes through the combustion chamber side water jacket 94 and the exhaust passage upper water jacket 95. Discharge.

  Further, an exhaust passage lower water jacket 89 is formed in the cylinder head 11, and the exhaust passage lower water jacket 89 extends from the combustion chamber side water jacket 94 below the collective passage portion 92. Cooling water is introduced into the exhaust passage lower water jacket 89 from the combustion chamber water jacket 94.

  Further, a sand removal hole 98 is provided in the vicinity of the exhaust outlet 93 in the front side wall portion 32 of the cylinder head 11, and this sand removal hole 98 communicates with the exhaust passage upper water jacket 95.

The combustion chamber side water jacket 94, the exhaust passage upper water jacket 95, the exhaust passage lower water jacket 89, and the sand removal hole 98 are formed using the sand core 100 shown in FIG. 8 when the cylinder head 11 is cast. The shape of the sand core 100 is such that the combustion chamber side water jacket 94, the exhaust passage upper water jacket 95, and the exhaust passage lower water jacket 8.
9 and the shape of the sand removal hole 98.

  The sand of the sand core 100 forming the exhaust passage upper water jacket 95 is discharged through the sand removal hole 98 after the cylinder head 11 is cast. The sand removal hole 98 is sealed with a sealing bolt 99 after the sand core 100 is discharged.

  4 and 5, the cylinder head 11 is formed with an overhang portion 111, and the overhang portion 111 protrudes from the front side wall portion 32 around the exhaust outlet 93. The aforementioned exhaust member 110 is attached to the overhanging portion 111.

  An exhaust passage upper water jacket 95 is disposed on the upper portion of the overhang portion 111. An exhaust passage lower water jacket 89 is disposed below the overhang portion 111. That is, the exhaust passage upper water jacket 95 and the exhaust passage lower water jacket 89 are disposed above and below the collective passage portion 92, respectively.

  A boss portion 112 is formed in the cylinder head 11, and this boss portion 112 projects from the front side wall portion 32 around the sand removal hole 98. A side surface of the boss portion 112 is connected to the overhang portion 111.

  Next, the operation will be described. In this engine 1, since cooling water is introduced into the combustion chamber side water jacket 94 from the outside, the sand of the sand core 100 forming the combustion chamber side water jacket 94 has cooling water introduction holes for introducing cooling water. Easily discharged from 96.

  On the other hand, the exhaust passage upper water jacket 95 extends from the combustion chamber side water jacket 94 and is therefore separated from the cooling water introduction hole 96. Further, the cooling water outlet 97 is disposed at the end of the cylinder head 11 in the cylinder row direction. For this reason, the sand of the sand core 100 forming the exhaust passage upper water jacket 95 is not easily discharged from the cooling water introduction hole 96 or the cooling water outlet 97, but is discharged as compared with the combustion chamber side water jacket 94. Hateful.

  Therefore, the engine 1 of the present embodiment is provided with a sand removal hole 98 communicating with the exhaust passage upper water jacket 95 in the vicinity of the exhaust outlet 93 in the front side wall portion 32 of the cylinder head 11. The sand of the sand core 100 forming the exhaust passage upper water jacket 95 is discharged through the sand removal hole 98 after the cylinder head 11 is cast. The sand removal hole 98 is sealed after the sand core 100 is discharged.

  According to the engine 1 of the present embodiment, since the sand removal hole 98 is disposed in the vicinity of the exhaust outlet 93 in the front side wall portion 32 of the cylinder head 11, the sand of the sand core 100 that forms the exhaust passage upper water jacket 95 is removed. It can be easily discharged through the sand removal hole 98. As a result, the manufacturability of the cylinder head 11 can be improved.

  Further, in the engine 1 of the present embodiment, the cylinder head 11 protrudes from the front side wall portion 32 around the exhaust outlet 93, the overhang portion 111 to which the exhaust member 110 is attached, and the front side wall portion around the sand removal hole 98. 32, and a boss 112 connected to the overhang 111.

  According to the engine 1 of the present embodiment, since the strength of the overhang portion 111 is reinforced by the boss portion 112 by connecting the boss portion 112 to the overhang portion 111, the overhang on which the load from the exhaust member 110 acts. The strength of the protruding portion 111 can be improved.

While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  DESCRIPTION OF SYMBOLS 1 ... Engine (internal combustion engine), 11 ... Cylinder head, 32 ... Front side wall part (side wall), 47 ... Exhaust collecting passage (exhaust passage), 90 ... Combustion chamber, 91 ... Diversified passage part, 92 ... Collecting passage part, 93 DESCRIPTION OF SYMBOLS ... Exhaust outlet, 94 ... Combustion chamber side water jacket, 95 ... Exhaust passage upper water jacket, 97 ... Cooling water outlet, 98 ... Sand vent, 100 ... Sand core, 110 ... Exhaust member, 111 ... Overhang part, 112 ... Boss

Claims (2)

A cylinder head manufactured by low-pressure casting and having a plurality of combustion chambers arranged in the cylinder row direction;
A plurality of manifold passage portions formed in the cylinder head and respectively communicating with the plurality of combustion chambers; a collecting passage portion where the plurality of manifold passage portions are gathered; and a side wall of the cylinder head in the center in the cylinder row direction An exhaust outlet that opens, and an exhaust passage that exhausts exhaust gas generated in the plurality of combustion chambers from the exhaust outlet;
A combustion chamber-side water jacket into which cooling water for cooling the combustion chamber is introduced from the outside;
An exhaust water passage upper water jacket that extends from the combustion chamber side water jacket to above the collecting passage portion and into which cooling water is introduced from the combustion chamber water jacket;
An internal combustion engine comprising: a cooling water outlet disposed at an end in a cylinder row direction of the cylinder head; and a cooling water outlet through which cooling water sequentially passing through the combustion chamber side water jacket and the exhaust passage upper water jacket is discharged. ,
In the vicinity of the exhaust outlet on the side wall of the cylinder head, a sand removal hole communicating with the exhaust passage upper water jacket is provided,
The sand core sand forming the exhaust passage upper water jacket after the casting of the cylinder head is discharged through the sand hole, and the sand hole is sealed after the sand core is discharged. An internal combustion engine characterized by the above. The cylinder head is
A projecting portion that protrudes from the side wall around the exhaust outlet and to which an exhaust member is attached;
2. The internal combustion engine according to claim 1, further comprising: a boss portion that protrudes from the side wall around the sand removal hole and is connected to the projecting portion.

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