JP6958095B2 - Internal combustion engine auxiliary equipment mounting structure - Google Patents

Description

The present invention relates to an auxiliary machine mounting structure of an internal combustion engine.

Auxiliary equipment such as an alternator and an air conditioner compressor is installed in an engine mounted on a vehicle such as an automobile (see Patent Document 1). In the engine described in Patent Document 1, an exhaust pipe is connected to an exhaust manifold that projects outward from the side surface of the engine.

An alternator and an air conditioner compressor are provided on the side surface of the engine, and the alternator and the air conditioner compressor are installed below the exhaust manifold and adjacent to the exhaust manifold.

Japanese Patent Application Laid-Open No. 7-180542

However, the conventional engine has an exhaust manifold that protrudes outward from the side surface of the engine, and the alternator and the air conditioner compressor are installed below the exhaust manifold, so that the dimensions in the height direction of the engine are large. It gets bigger. Therefore, the engine becomes large.

The present invention has been made in view of the above circumstances, and is a supplement to an internal combustion engine capable of attaching an auxiliary machine to the internal combustion engine by preventing the dimensions of the internal combustion engine from becoming large in the height direction. It is intended to provide a machine mounting structure.

In the present invention, a cylinder block having a plurality of cylinders arranged in a row and a cylinder head provided above the cylinder block and having an exhaust passage for exhausting exhaust gas from the cylinders are formed therein. The exhaust passage is provided for each cylinder, and the exhaust passage portion through which the exhaust gas discharged from the cylinder flows and the exhaust passage portion downstream of the exhaust passage portion are provided, and at least two of the exhaust passage portions are provided. The exhaust gas that collects for each cylinder and the exhaust gas that communicates with the exhaust collecting part and opens to the side surface side of the cylinder head along the arrangement direction of the cylinders and flows through the exhaust collecting part of the cylinder head. It is an auxiliary machine mounting structure of an internal combustion engine including an exhaust port for discharging to the outside, and bulges outward from the side surface on the side surface of the cylinder head and is along the arrangement direction of the cylinder. An bulging portion extending from the side surface of the cylinder head to form the exhaust passage portion, and an exhaust flange portion extending outward from the bulging portion to form the exhaust collecting portion and the exhaust port. A plurality of boss portions to which auxiliary machines are attached are formed, and the plurality of boss portions are formed by at least a first boss portion formed between the bulging portion and the lower end portion of the cylinder head. A second boss portion formed above the first boss portion with the bulging portion sandwiched in the height direction of the internal combustion engine is provided, and the auxiliary machine is provided in the arrangement direction of the cylinders. It is attached to the side surface of the cylinder head via at least the first boss portion and the second boss portion so as to be adjacent to the exhaust flange portion, and is attached to the end portion of the cylinder head in the arrangement direction of the cylinders. A case flange portion is formed to which a chain case covering the timing chain is connected, and the second boss portion is connected to the case flange portion .

As described above, according to the present invention, it is possible to prevent the dimension of the internal combustion engine from becoming large in the height direction and to attach an auxiliary machine to the internal combustion engine.

FIG. 1 is a front view of an engine provided with an auxiliary machine mounting structure according to an embodiment of the present invention. FIG. 2 is a left side view of an engine provided with an auxiliary machine mounting structure according to an embodiment of the present invention. FIG. 3 is a right side view of an engine provided with an auxiliary machine mounting structure according to an embodiment of the present invention. FIG. 4 is a front view of a cylinder block and a cylinder head of an engine having an auxiliary machine mounting structure according to an embodiment of the present invention, and is an enlarged view of the vicinity of an exhaust pipe. FIG. 5 is a front view of a cylinder block and a cylinder head of an engine having an auxiliary machine mounting structure according to an embodiment of the present invention, and is a view showing a state in which an exhaust pipe, a catalytic converter, and a starter generator are removed. .. FIG. 6 is a cross-sectional view taken along the line in the VI-VI direction of FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 8 is a view of the catalytic converter viewed from below in the engine provided with the auxiliary machine mounting structure according to the embodiment of the present invention. FIG. 9 is a front view of a cylinder block and a cylinder head of an engine having an auxiliary machine mounting structure according to an embodiment of the present invention, and is a view showing a state in which a bracket for mounting the auxiliary machine is attached.

The auxiliary machine mounting structure of the internal combustion engine according to the embodiment of the present invention is provided with a cylinder block having a plurality of cylinders arranged in a row and an upper portion of the cylinder block, and internally exhausts from the plurality of cylinders. A cylinder head having an exhaust passage for discharging gas is provided, and an exhaust passage is provided for each cylinder, and an exhaust passage portion through which exhaust gas discharged from the cylinder flows and an exhaust passage portion downstream of the exhaust passage portion are provided. An exhaust gas collecting part that collects at least two exhaust passage parts for each cylinder and an exhaust gas that communicates with the exhaust collecting part and opens on the side surface side of the cylinder head along the cylinder arrangement direction to allow exhaust gas flowing through the exhaust collecting part. It is an auxiliary equipment mounting structure of an internal combustion engine including an exhaust port for discharging to the outside of the cylinder head. A plurality of bulging parts that extend and form an exhaust passage part, an exhaust flange part that protrudes outward from the side surface of the cylinder head to form an exhaust collecting part and an exhaust port, and an auxiliary machine are attached. At least one of the plurality of boss portions is formed between the bulging portion and the lower end portion of the cylinder head, and the auxiliary machine is formed with the exhaust flange portion in the cylinder arrangement direction. It is attached to the side surface of the cylinder head via a plurality of boss portions so as to be adjacent to each other.

As a result, it is possible to prevent the size of the internal combustion engine from becoming large in the height direction and to attach an auxiliary machine to the internal combustion engine.

Hereinafter, the auxiliary machine mounting structure of the internal combustion engine according to the embodiment of the present invention will be described with reference to the drawings.
1 to 9 are views showing an auxiliary machine mounting structure of an internal combustion engine according to an embodiment of the present invention. In FIGS. 1 to 9, the up-down, front-back, left-right directions are such that the cylinder arrangement direction is the left-right direction when the side in which the exhaust pipe is installed is in the direction orthogonal to the direction along the engine cylinder arrangement direction. The height direction of the engine is the vertical direction.

First, the configuration will be described.
In FIGS. 1 and 2, an engine 1 as an internal combustion engine is installed in an engine room (not shown) of a vehicle. The engine 1 has a cylinder block 2, a cylinder head 3 attached to the upper part of the cylinder block 2, and an oil pan 4 attached to the lower part of the cylinder block 2.

A plurality of cylinders 2A, 2B, 2C, and 2D (see FIG. 6) are provided in the cylinder block 2, and the cylinders 2A, 2B, 2C, and 2D are arranged in a row in the left-right direction of the engine 1. There is. Pistons (not shown) are housed in cylinders 2A, 2B, 2C, and 2D, and the pistons reciprocate in the vertical direction with respect to the cylinders.

The piston is connected to the crankshaft 2S (see FIG. 3) via a connecting rod (not shown), and the reciprocating motion of the piston is converted into the rotational motion of the crankshaft 2S via the connecting rod.

The cylinder head 3 has a plurality of intake ports 3A (see FIG. 6), a plurality of intake valves (not shown) for opening / closing the intake port 3A, an exhaust port 3B (see FIG. 6), and a plurality of not shown for opening / closing the exhaust port 3B. Exhaust valve etc. are provided. The intake port 3A introduces air into the cylinders 2A, 2B, 2C and 2D, and the exhaust port 3B discharges the exhaust gas burned in the cylinders 2A, 2B, 2C and 2D from the cylinder.

The cylinder head 3 is rotatably provided with an intake camshaft having an intake cam (not shown) and an exhaust camshaft having an exhaust cam, and the intake valve and the exhaust valve are opened and closed by the intake cam and the exhaust cam. NS.

In FIG. 1, a chain case 5 (see FIG. 3) is provided on the right side surfaces of the cylinder block 2 and the cylinder head 3, and the chain case 5 is provided at a timing provided on the right side surfaces of the cylinder block 2 and the cylinder head 3. It covers the chain 6 (shown by a virtual line in FIG. 3).

In FIGS. 4 and 5, case flange portions 2F and 3F are formed at the right ends of the cylinder block 2 and the cylinder head 3, and the chain case 5 is provided with case flange portions 2F and 3F by bolts 20 (see FIG. 4). It is concluded in. The right end of the cylinder head 3 of this embodiment constitutes the end of the cylinder head of the present invention in the cylinder arrangement direction.

In FIG. 3, the timing chain 6 connects the crank pulley 46 provided on the crankshaft 2S and the cam pulleys 17A and 17B provided on the intake camshaft and the exhaust camshaft, respectively, and powers the crankshaft 2S. It is transmitted to the intake camshaft and the exhaust camshaft.

In FIG. 1, a transmission 7 is attached to the left side surface of the cylinder block 2, and the transmission 7 has a plurality of transmission gears (not shown) for establishing a plurality of gears, and the rotation speed of the engine 1. To shift.

Oil for lubricating the crankshaft 2S, the piston, and the like is stored in the oil pan 4, and the oil is supplied to the crankshaft 2S, the piston, and the like by an oil pump (not shown).

In FIGS. 1 and 4, an exhaust pipe 8 is attached to the cylinder head 3, and the exhaust pipe 8 is a side surface 3a of the cylinder head 3 and a cylinder block 2 along the arrangement directions of the cylinders 2A, 2B, 2C, and 2D. It is installed on the side surface 2a of. Exhaust gas discharged from the exhaust port 3B is introduced into the exhaust pipe 8.

A catalytic converter 9 is attached to the downstream end of the exhaust pipe 8, and the exhaust pipe 8 and the catalytic converter 9 extend in the height direction of the engine 1. The catalyst converter 9 purifies the exhaust gas discharged from the exhaust pipe 8 and then discharges the exhaust gas to an exhaust pipe (not shown) provided on the downstream side. The exhaust pipe 8 and the catalytic converter 9 of this embodiment constitute the exhaust pipe of the present invention.

In FIG. 6, an exhaust passage 11 is formed inside the cylinder head 3. The exhaust passage 11 includes exhaust passage portions 12A, 12B, 12C, 12D, exhaust collecting portions 13A, 13B, and a first exhaust port 14A and a second exhaust port 14B (see FIG. 5).

The exhaust passage portions 12A, 12B, 12C, and 12D communicate with the cylinders 2A, 2B, 2C, and 2D, respectively, via the exhaust port 3B. The exhaust passage portions 12B and 12C are formed below the exhaust passage portions 12A and 12D, and the exhaust gas discharged from the cylinders 2A, 2B, 2C and 2D is the exhaust passage portions 12A, 12B, 12C and 12D, respectively. It flows. In FIG. 6, the exhaust gas flowing through the exhaust passage 11 is indicated by an arrow W.

The exhaust collecting portion 13A is provided on the downstream side of the exhaust passage portions 12A and 12D. The exhaust collecting portion 13A collects the exhaust passage portions 12A and 12D, and collects the exhaust gas flowing through the exhaust passage portions 12A and 12D.

The exhaust collecting portion 13B is formed below the exhaust collecting portion 13A (see FIG. 7), and is provided on the downstream side of the exhaust passage portions 12B and 12C. The exhaust collecting portion 13B collects the exhaust passage portions 12B and 12C, and collects the exhaust gas flowing through the exhaust passage portions 12B and 12C.

The first exhaust port 14A opens on the side surface 3a of the cylinder head 3 and communicates with the exhaust collecting portion 13A. The second exhaust port 14B opens to the side surface 3a of the cylinder head 3 below the first exhaust port 14A and communicates with the exhaust collecting portion 13B.

As a result, the exhaust gas discharged from the cylinders 2A and 2D flows through the exhaust passage portions 12A and 12D through the exhaust port 3B, and then is discharged to the outside of the cylinder head 3 from the first exhaust port 14A through the exhaust collecting portion 13A. NS.

Exhaust gas discharged from the cylinders 2B and 2C flows through the exhaust passage portions 12B and 12C through the exhaust port 3B, and then is discharged to the outside of the cylinder head 3 from the second exhaust port 14B through the exhaust collecting portion 13B.

In FIGS. 4 and 5, a bulging portion 15 is formed on the side surface 3a of the cylinder head 3. The bulging portion 15 bulges outward from the side surface 3a of the cylinder head 3 and extends along the arrangement direction of the cylinders 2A, 2B, 2C, and 2D. The bulging portion 15 is formed with exhaust passage portions 12A and 12D located above the exhaust passage portions 12B and 12C.

In FIG. 5, an exhaust flange portion 16 is formed on the side surface 3a of the cylinder head 3, and the exhaust flange portion 16 projects outward from the side surface 3a of the cylinder head 3 with respect to the bulging portion 15 (FIG. 6). reference). As shown in FIG. 7, the exhaust flange portion 16 is formed with exhaust collecting portions 13A and 13B and a first exhaust port 14A and a second exhaust port 14B.

In FIG. 5, the bulging portion 15 is inclined upward from both sides in the cylinder arrangement direction toward the exhaust flange portion 16 and is connected to the exhaust flange portion 16.

In FIG. 6, cylinders 2A and 2D are installed on both sides of the cylinder block 2 in the array direction, the cylinder 2A constitutes the first outer cylinder of the present invention, and the cylinder 2D is the invention. It constitutes the second outer cylinder.

The cylinders 2B and 2C are sandwiched between the cylinders 2A and 2D in the arrangement direction of the cylinders, and the cylinders 2B and 2C constitute the inner cylinder of the present invention.

The exhaust passage portion 12A extends from the cylinder 2A to the exhaust flange portion 16 via the bulging portion 15 and constitutes the first outer exhaust passage portion of the present invention. The exhaust passage portion 12D extends from the cylinder 2D to the exhaust flange portion 16 via the bulging portion 15 and constitutes the second outer exhaust passage portion of the present invention.

The exhaust passage portion 12B extends from the cylinder 2B to the exhaust flange portion 16 and constitutes the inner exhaust passage portion of the present invention. The exhaust passage portion 12C extends from the cylinder 2C to the exhaust flange portion 16 and constitutes the inner exhaust passage portion of the present invention.

The exhaust collecting portion 13A aggregates the exhaust passage portion 12A and the exhaust passage portion 12D, and constitutes the first exhaust collecting portion of the present invention. The exhaust collecting portion 13B formed below the exhaust collecting portion 13A aggregates the exhaust passage portion 12B and the exhaust passage portion 12C, and constitutes the second exhaust collecting portion of the present invention.

The first exhaust port 14A communicating with the exhaust collecting portion 13A and the second exhaust port 14B communicating with the exhaust collecting portion 13B below the first exhaust port 14A constitute the exhaust port of the present invention.

In FIG. 7, the upstream end of the exhaust pipe 8 is attached to the exhaust flange portion 16. The exhaust pipe 8 has a first exhaust pipe passage 22 and a second exhaust pipe passage 23 partitioned by a partition wall 21. Here, upstream and downstream mean upstream and downstream with respect to the direction in which the exhaust gas flows.

The first exhaust pipe passage 22 communicates with the first exhaust port 14A, and exhaust gas is discharged to the first exhaust pipe passage 22 from the first exhaust port 14A. The second exhaust pipe passage 23 communicates with the second exhaust port 14B, and exhaust gas is discharged to the second exhaust pipe passage 23 from the second exhaust port 14B.

The first exhaust pipe passage 22 is formed above the second exhaust pipe passage 23 and outward from the side surface 3a of the cylinder head 3 with respect to the second exhaust pipe passage 23.

The exhaust pipe 8 extends linearly outward from the side surface 3a of the cylinder head 3, and then curves downward and extends.

That is, the exhaust pipe 8 of the present embodiment has a straight portion 31 extending linearly outward from the exhaust flange portion 16 and a curved inner side surface 32a that curves downward from the straight portion 31 and faces the side surface 2a of the cylinder block 2. And a curved portion 32 having a curved outer surface 32b located on the opposite side of the side surface 2a of the cylinder block 2.

The curved portion 32 is in the direction in which the axial line 2L of the cylinder and the curved outer surface 32b extend with respect to the maximum distance Lmax at which the curved outer surface 32b and the cylinder axis 2L are farthest from each other in the axial direction orthogonal to the cylinder axis 2L. It is curved so that the distance L from the tip portion 32c is short. Here, the axis of the cylinder is based on the axis 2L of the cylinder 2B or the cylinder 2C formed near the exhaust pipe 8 among the cylinders 2A, 2B, 2C and 2D.

In other words, the first center point O1 is set near the center of the first exhaust pipe passage 22 in the extending direction of the central axis C1, and the virtual line that crosses the first center point O1 in the vertical direction is the first virtual line. Let it be L1. Further, a virtual line that vertically crosses the central axis C1 that passes through the downstream opening end 22a of the first exhaust pipe passage 22 is referred to as a second virtual line L2.

In the exhaust pipe 8 of this embodiment, the curved portion 32 is curved so that the second virtual line L2 approaches the side surface 3a of the cylinder head 3 with respect to the first virtual line L1.
In FIGS. 7 and 8, the catalyst converter 9 is provided with an exhaust sensor 10, and the exhaust sensor 10 detects the amount of oxygen in the exhaust gas. In FIG. 7, the exhaust sensor 10 is installed facing the downstream opening end 22a of the first exhaust pipe passage 22 and on the partition wall 21 side.

Specifically, a third virtual line extends along the central axis C1 on the downstream side of the first exhaust pipe passage 22 through the tip inner peripheral surface 32e of the curved inner peripheral surface 32d on the back side of the curved outer surface 32b. Let it be a virtual line L3. Further, a virtual line extending along the central axis C2 on the downstream side of the second exhaust pipe passage 23 through the lower end portion 21a of the partition wall 21 facing the side surface 2a of the cylinder block 2 is referred to as a fourth virtual line L4. ..

The exhaust sensor 10 of this embodiment is installed between the third virtual line L3 and the fourth virtual line L4.
The partition wall 21 includes a first partition wall portion 21A extending linearly outward from the exhaust flange portion 16, a second partition wall portion 21B curved downward from the first partition wall portion 21A, and a second partition wall portion 21B. It is configured to include a third partition wall portion 21C extending linearly downward from the partition wall portion 21B.

The plate thickness T2 of the second partition wall portion 21B is formed to be larger than the plate thickness T1 of the first partition wall portion 21A, and the plate thickness T3 of the third partition wall portion 21C is the second partition wall. The portion 21B is formed to be smaller than the plate thickness T2. That is, the partition wall 21 is formed so that the plate thickness gradually increases from the upstream side to the downstream side and then gradually decreases toward the downstream side.

The first exhaust pipe passage 22 and the second exhaust pipe passage 23 have a larger opening area on the downstream side connected to the catalytic converter 9 than on the upstream side connected to the exhaust flange portion 16.

In FIGS. 4 and 5, a first boss portion 35 and a second boss portion 36 are formed on the side surface 3a of the cylinder head 3, and a third boss portion 37 is formed on the side surface 2a of the cylinder block 2. Has been done. The first boss portion 35 and the second boss portion 36 of the present embodiment constitute the boss portion of the present invention.

In FIG. 5, the first boss portion 35 and the second boss portion 36 are provided adjacent to the exhaust flange portion 16 in the cylinder arrangement direction. The bulging portion 15 is formed above the second exhaust port 14B in the height direction of the engine 1, and the first boss portion 35 includes the bulging portion 15, the lower end portion 3b of the cylinder head 3, and the exhaust. It is formed in a space 52 surrounded by a flange portion 16.

The exhaust flange portion 16 is connected to the bulging portion 15 and extends above and below the bulging portion 15 in the height direction of the engine 1.

The second boss portion 36 is formed above the first boss portion 35 with the bulging portion 15 interposed therebetween in the height direction of the engine 1, and is connected to the case flange portion 3F of the cylinder head 3. ..

The third boss portion 37 is formed in the cylinder block 2 so as to be aligned with the second boss portion 36 in the height direction of the engine 1. As shown in FIG. 5, the third boss portion 37 is formed above the central portion C3 in the height direction of the cylinder block 2.

The mounting bracket 42 of the integrated starter generator 41 shown in FIG. 3 is fastened to the first boss portion 35, the second boss portion 36, and the third boss portion 37 by bolts 43 (FIG. 9). reference).

In FIG. 9, a boss portion 42A is formed on the mounting bracket 42, and the boss portion 42A extends in the left-right direction of the engine 1.

In FIG. 3, the starter generator 41 is provided with an upper fastening portion 41A and a lower fastening portion 41B. The upper fastening portion 41A is provided on the upper portion of the starter generator 41, and the upper fastening portion 41A is fastened to the boss portion 42A of the mounting bracket 42 by the bolt 44A.

The lower fastening portion 41B is provided below the starter generator 41, and the lower fastening portion 41B is fastened to the cylinder block 2 by bolts 44B.

As a result, the starter generator 41 passes through the cylinder head via the first boss portion 35 and the second boss portion 36 so that the mounting bracket 42 is adjacent to the exhaust flange portion 16 in the cylinder arrangement direction (left-right direction). It is attached to the side surface 3a of No. 3 (see FIG. 1). The starter generator 41 of this embodiment includes a mounting bracket 42.

An elastic body (not shown) is provided as a cushion between the boss portion 42A and the bolt 44A, and the vibration of the starter generator 41 is absorbed by the elastic body.

In FIG. 3, the starter generator 41 includes a motor pulley 45, and the motor pulley 45 is connected to a crank pulley 46 attached to the right end of the crankshaft 2S via a transmission belt 47.

In FIG. 1, an air conditioner compressor 49 is attached to the side surface 2a of the cylinder block 2 below the starter generator 41. In FIG. 3, the air conditioner compressor 49 includes a compressor pulley 49A, and the compressor pulley 49A is connected to the crank pulley 46 by a transmission belt 47.

The starter generator 41 uses the function of an electric motor that rotationally drives the engine 1 via the transmission belt 47 by rotating when power is supplied, and the rotational force input from the crankshaft 2S via the transmission belt 47. It has the function of a generator to convert to.

The air conditioner compressor 49 is driven by the power transmitted from the crankshaft 2S via the transmission belt 47, and compresses the refrigerant to a high pressure.

In FIGS. 1 and 3, a tensioner member 50 is provided on the side surface 2a of the cylinder block 2. The tensioner member 50 includes a tension roller 50A and a tension bracket 50B that rotatably supports the tension roller 50A.

The tension roller 50A is in contact with the transmission belt 47 and applies tension to the transmission belt 47. The tension bracket 50B is fastened to the starter generator 41 by bolts 51. As a result, the tensioner member 50 is stably supported by the starter generator 41, and can receive the reaction force from the transmission belt 47 and apply tension to the transmission belt 47.

In FIG. 1, the tensioner member 50 is a space 53 surrounded by a third boss portion 37, an air conditioner compressor 49, a catalytic converter 9, and a chain case 5, and is a starter generator 41 and an air conditioner in the height direction of the engine 1. It is installed at a position sandwiched between the compressor 49 and the compressor 49.

An auto tensioner 54 is provided on the side surface 2a of the cylinder block 2, and the auto tensioner 54 adjusts the tension of the transmission belt 47 by using hydraulic pressure or the like. The starter generator 41 of the present embodiment constitutes the auxiliary machine of the present invention, the first auxiliary machine, and the rotary electric machine, and the air conditioner compressor 49 constitutes the second auxiliary machine of the present invention.

In FIGS. 4 and 5, a boss portion 38 for a core is formed on the side surface 3a of the cylinder head 3, and the boss portion 38 uses the core in a step of forming a water jacket (not shown) of the cylinder head 3. Used when pulling out. The boss portion 38 is closed by the plug 38A, and the plug 38A can prevent the cooling water from leaking from the water jacket to the outside of the cylinder head 3.

A first rib 55, a second rib 56, and a third rib 57 are formed on the side surface of the cylinder head 3. The first rib 55 connects the first boss portion 35 and the second boss portion 36, and the first rib 55 is connected to the bulging portion 15 so as to cross the bulging portion 15. There is.

The second rib 56 extends upward from the first boss portion 35 and toward the exhaust flange portion 16 so as to cross the bulging portion 15, and the tip portion in the extending direction is connected to the boss portion 38. ing.

The third rib 57 extends laterally from the second boss portion 36 toward the exhaust flange portion 16, and the tip portion in the extending direction is connected to the boss portion 38. As a result, the tip end portion of the second rib 56 in the extending direction and the tip end portion of the third rib 57 in the extending direction are connected via the boss portion 38.

A triangular rib (hereinafter referred to as a triangular rib 58) is formed on the side surface 3a of the cylinder head 3 by the first rib 55, the second rib 56, and the third rib 57, and the triangular rib 58 is a bulging portion. It is connected to the exhaust flange portion 16 via 15.

In FIG. 1, the exhaust pipe 8 and the catalytic converter 9 are installed so as to be separated from the starter generator 41 in the cylinder arrangement direction with respect to the exhaust flange portion 16, and the starter generator 41 is installed in the cylinder arrangement direction. It is installed between the catalytic converter 9 and the case flanges 2F and 3F (see FIG. 4).

As described above, according to the auxiliary machine mounting structure of the engine 1 of the present embodiment, the side surface 3a of the cylinder head 3 along the cylinder arrangement direction bulges outward from the side surface 3a of the cylinder head 3 and the cylinder The bulging portion 15 extending along the arrangement direction and forming the exhaust passage portions 12A and 12D, and the exhaust collecting portions 13A, 13B and the first one protruding outward from the bulging portion 15 from the side surface 3a of the cylinder head 3. The exhaust flange portion 16 on which the exhaust port 14A and the second exhaust port 14B are formed, and the first boss portion 35 and the second boss portion 36 to which the starter generator 41 is attached are formed.

The first boss portion 35 is formed between the bulging portion 15 and the lower end portion 3b of the cylinder head 3, and the starter generator 41 is first so as to be adjacent to the exhaust flange portion 16 in the cylinder arrangement direction. It is attached to the side surface 3a of the cylinder head 3 via the boss portion 35 and the second boss portion 36 of the cylinder head 3.

As a result, it is not necessary to provide the exhaust manifold protruding outward from the side surface 3a of the cylinder head 3 on the side surface 3a of the cylinder head 3, and the starter generator 41 is attached to the cylinder head 3 so as to avoid the exhaust manifold. Can be eliminated.

Therefore, the starter generator 41 can be mounted upward on the side surface 3a of the cylinder head 3. Therefore, the space below the starter generator 41 can be easily expanded as compared with the conventional engine, and the degree of freedom in installing the air conditioner compressor 49 installed below the starter generator 41 can be improved.

Further, since the starter generator 41 can be installed upward on the side surface 3a of the cylinder head 3, when the starter generator 41 and the air conditioner compressor 49 are installed so as to overlap each other in the height direction of the engine 1, the dimensions in the height direction of the engine 1 Can be prevented from becoming large.

As described above, the auxiliary machine mounting structure of the engine 1 of the present embodiment can prevent the dimension of the engine 1 in the height direction from becoming large, and the starter generator 41 can be mounted on the engine 1.

Further, when the first boss portion 35 and the second boss portion 36 for mounting the starter generator 41 are formed on the exhaust manifold protruding outward from the side surface of the cylinder head as in a conventional engine, the starter is formed. The generator 41 may protrude greatly outward from the side surface of the cylinder head, and the size of the engine 1 in the front-rear direction may increase.

On the other hand, in the auxiliary machine mounting structure of the engine 1 of the present embodiment, the first boss portion 35 and the second boss portion 36 for mounting the starter generator 41 are formed on the side surface 3a of the cylinder head 3. , The starter generator 41 can be prevented from protruding outward from the side surface 3a of the cylinder head 3, and the size of the engine 1 in the front-rear direction can be prevented from becoming large.

Further, since the first boss portion 35 and the second boss portion 36 are formed adjacent to the highly rigid bulging portion 15, the starter generator 41 is placed on the side surface of the cylinder head 3 via the mounting bracket 42. It can be firmly attached to 3a. Therefore, the starter generator 41 can be stably supported by the cylinder head 3 while suppressing the vibration of the starter generator 41 from being transmitted to the engine 1.

Further, according to the auxiliary machine mounting structure of the engine 1 of the present embodiment, the cylinders are installed on both sides of the cylinder block 2 in the cylinder arrangement direction, respectively, and the cylinders 2A and 2D in the cylinder arrangement direction. It is equipped with cylinders 2B and 2C that are sandwiched between the cylinders 2B and 2C.

The exhaust passage portion formed inside the cylinder head 3 includes an exhaust passage portion 12A extending from the cylinder 2A via the bulging portion 15 to the exhaust flange portion 16 and an exhaust flange portion extending from the cylinder 2D via the bulging portion 15. It includes an exhaust passage portion 12D extending to the portion 16 and exhaust passage portions 12B and 12C extending from the cylinders 2B and 2C to the exhaust flange portion 16.

The exhaust collecting portion formed inside the cylinder head 3 is an exhaust collecting portion 13A that gathers the exhaust passage portion 12A and the exhaust passage portion 12D, and an exhaust collecting portion 13B that gathers the exhaust passage portion 12B and the exhaust passage portion 12C. And have.

The exhaust ports formed inside the cylinder head 3 are a first exhaust port 14A communicating with the exhaust collecting portion 13A and a second exhaust port 14A formed below the first exhaust port 14A and communicating with the exhaust collecting portion 13B. It is equipped with an exhaust port 14B.

The bulging portion 15 is formed above the second exhaust port 14B in the height direction of the engine 1, and the first boss portion 35 exhausts the bulging portion 15 and the lower end portion 3b of the cylinder head 3. It is formed in a space 52 surrounded by a flange portion 16.

In this way, the bulging portion 15 is formed above the second exhaust port 14B with respect to the first exhaust port 14A and the second exhaust port 14B arranged in the height direction of the engine 1, and the first Since the boss portion 35 is formed in the space 52 surrounded by the bulging portion 15, the lower end portion 3b of the cylinder head 3, and the exhaust flange portion 16, the starter generator 41 is positioned higher than the cylinder head 3. Can be installed.

Therefore, the space below the starter generator 41 can be further expanded, and the degree of freedom in installing the air conditioner compressor 49 installed below the starter generator 41 can be more effectively improved. As a result, it is possible to more effectively prevent the size of the engine 1 in the height direction from becoming large.

Further, according to the auxiliary machine mounting structure of the engine 1 of the present embodiment, a case flange portion 3F to which the chain case 5 covering the timing chain 6 is connected is formed at the right end portion of the cylinder head 3 in the cylinder arrangement direction. There is.

On the side surface 3a of the cylinder head 3, a first boss portion 35 formed between the bulging portion 15 and the lower end portion 3b of the cylinder head 3 and the bulging portion 15 in the height direction of the engine 1 are sandwiched. A second boss portion 36 formed above the boss portion 35 of 1 is formed, and the second boss portion 36 is connected to the case flange portion 3F.

As a result, the first boss portion 35 can be adjacent to the highly rigid bulging portion 15, and the second boss portion 36 can be connected to the highly rigid case flange portion 3F, so that the first boss portion 35 and the first boss portion 35 and the first boss portion 35 can be connected to each other. The rigidity of the boss portion 36 of 2 can be increased more effectively.

Therefore, the starter generator 41 can be mounted more firmly on the side surface 3a of the cylinder head 3 via the mounting bracket 42. Therefore, the starter generator 41 can be supported more stably by the cylinder head 3 while more effectively suppressing the vibration of the starter generator 41 from being transmitted to the engine 1.

Further, according to the auxiliary machine mounting structure of the engine 1 of the present embodiment, a first rib 55 connecting the first boss portion 35 and the second boss portion 36 is formed on the side surface 3a of the cylinder head 3. The first rib 55 is connected to the bulge portion 15 so as to cross the bulge portion 15.

Therefore, the rigidity of the first boss portion 35 and the second boss portion 36 can be further increased by the first rib 55 and the bulging portion 15, and the starter generator 41 is connected to the cylinder via the mounting bracket 42. The side surface 3a of the head 3 can be attached more firmly.

Further, according to the auxiliary machine mounting structure of the engine 1 of the present embodiment, the exhaust flange portion 16 is connected to the bulging portion 15. Further, on the side surface 3a of the cylinder head 3, a first rib 55 and a second rib 56 extending upward from the first boss portion 35 and toward the exhaust flange portion 16 so as to cross the bulging portion 15 And a third rib 57 extending laterally from the second boss portion 36 toward the exhaust flange portion 16 and being connected to the tip portion in the extending direction of the second rib 56 via the boss portion 38. The rib 58 is formed. In addition to this, the triangular rib 58 is connected to the exhaust flange portion 16 via the bulging portion 15.

As a result, in addition to the rigidity of the first boss portion 35 and the second boss portion 36, the rigidity of the side surface 3a of the cylinder head 3 can be improved by the triangular rib 58. Therefore, the starter generator 41 can be mounted more firmly on the side surface 3a of the cylinder head 3 via the mounting bracket 42.

Further, according to the auxiliary machine mounting structure of the engine 1 of this embodiment, the auxiliary machine is composed of the starter generator 41. Since the exhaust pipe 8 and the catalytic converter 9 are not installed above the starter generator 41, and the exhaust pipe 8 and the catalytic converter 9 are installed adjacent to the starter generator 41 in the left-right direction, the starter is installed. It is possible to prevent the exhaust pipe 8 and the catalytic converter 9 from being exposed to the heat generated from the generator 41 and rising.

Therefore, it is possible to prevent the exhaust gas flowing through the exhaust pipe 8 from becoming excessively high, and prevent the exhaust pipe 8 and the catalytic converter 9 from being damaged by heat. As a result, it is possible to prevent the exhaust pipe 8 and the catalytic converter 9 from deteriorating at an early stage.

Further, according to the auxiliary machine mounting structure of the engine 1 of the present embodiment, the exhaust pipe 8 connected to the exhaust flange portion 16 is installed so as to be separated from the starter generator 41 in the cylinder arrangement direction with respect to the exhaust flange portion 16. The starter generator 41 is installed between the exhaust pipe 8 and the catalytic converter 9 and the case flange portion 3F in the cylinder arrangement direction.

As a result, the starter generator 41 can be installed closer to the exhaust pipe 8 and the catalyst converter 9 side with respect to the case flange portion 3F. Therefore, the dimensions of the engine 1 in the left-right direction can be shortened, and the size of the engine 1 can be reduced.

Further, according to the auxiliary machine mounting structure of the engine 1 of the present embodiment, a third boss portion 37 to which the starter generator 41 is mounted is formed on the side surface 2a of the cylinder block 2 along the cylinder arrangement direction. The third boss portion 37 is formed above the central portion C3 in the height direction of the cylinder block 2.

Further, an air conditioner compressor 49 connected to the starter generator 41 by a transmission belt 47 is attached to the side surface 2a of the cylinder block 2 below the starter generator 41.

In addition to this, a tensioner member 50 that applies tension to the transmission belt 47 is attached to the side surface 2a of the cylinder block 2, and the tensioner member 50 is a third boss portion 37, an air conditioner compressor 49, a catalyst converter 9, and a chain. It is installed in a space 53 surrounded by the case 5 and at a position sandwiched between the starter generator 41 and the air conditioner compressor 49 in the height direction of the engine 1.

As a result, in the space below the starter generator 41, which is larger than that of the conventional engine, the tensioner member 50 is installed in the space 53 sandwiched between the starter generator 41 and the air conditioner compressor 49, thereby reducing the size of the engine 1. While trying, the starter generator 41 can be attached to the cylinder head 3.

Further, since the air conditioner compressor 49 is installed below the starter generator 41 and the tensioner member 50 can be covered from below by the air conditioner compressor 49, flying stones and the like can collide with the air conditioner compressor 49 when the vehicle is running. Therefore, it is possible to prevent stepping stones and the like from directly colliding with the tensioner member 50, and it is possible to protect the tensioner member 50.

The auxiliary machine of this embodiment is composed of a starter generator 41, but is not limited to this, and may be composed of a motor or a generator.

Further, although the tip portion in the extending direction of the second rib 56 and the tip portion in the extending direction of the third rib 57 of this embodiment are connected to the boss portion 38, the tip portion in the extending direction of the second rib 56 is connected. The tip portion and the tip portion in the extending direction of the third rib 57 may be directly connected.

Although the embodiments of the present invention have been disclosed, it is clear that some skilled in the art can make changes without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

1 ... engine (internal combustion engine), 2 ... cylinder block, 2A ... cylinder (first outer cylinder), 2B ... cylinder (inner cylinder), 2C ... cylinder (inner cylinder), 2D ... Cylinder (second outer cylinder), 2F ... Case flange, 2a ... Side (side of cylinder block), 3 ... Cylinder head, 3a ... Side (side of cylinder head) ), 3b ... lower end (lower end of cylinder head), 5 ... chain case, 6 ... timing chain, 8 ... exhaust pipe, 9 ... catalytic converter (exhaust pipe), 10. .. Exhaust sensor, 11 ... Exhaust passage, 12A ... Exhaust passage (first outer exhaust passage), 12B ... Exhaust passage (inner exhaust passage), 12C ... Exhaust passage (Inner exhaust passage part), 12D ... Exhaust passage part (second outer exhaust passage part), 13A ... Exhaust collecting part (first exhaust collecting part), 13B ... Exhaust collecting part (second) (Exhaust collecting part), 14A ... 1st exhaust port (exhaust port), 14B ... 2nd exhaust port (exhaust port), 15 ... bulging part, 16 ... exhaust flange part, 35 ... 1st boss part (boss part), 36 ... 2nd boss part (boss part), 37 ... 3rd boss part, 41 ... Starter generator (auxiliary machine, 1st Auxiliary machine, rotary electric machine), 49 ... air conditioner compressor (second auxiliary machine), 47 ... transmission belt, 50 ... tensioner member, 52 ... space (bulging part and lower end of cylinder head) Space surrounded by the part and the exhaust flange part), 53 ... space (the space surrounded by the third boss part, the second auxiliary machine, the exhaust pipe and the chain case), 55 ... the first Ribs (ribs), 56 ... 2nd ribs (ribs), 57 ... 3rd ribs (ribs )

Claims (7)

A cylinder block having a plurality of cylinders arranged side by side in a row, and a cylinder head provided on the upper part of the cylinder block and having an exhaust passage for exhausting exhaust gas from the cylinders are formed therein.
The exhaust passage is provided for each cylinder, and an exhaust passage portion through which exhaust gas discharged from the cylinder flows and an exhaust passage portion downstream of the exhaust passage portion are provided, and at least two of the exhaust passage portions are provided in the respective cylinders. The exhaust gas that collects each time and the exhaust gas that communicates with the exhaust collecting part and opens to the side surface side of the cylinder head along the arrangement direction of the cylinders, and the exhaust gas flowing through the exhaust collecting part is sent to the outside of the cylinder head. It is an auxiliary equipment mounting structure of an internal combustion engine that includes an exhaust port for exhaust gas.
The side surface of the cylinder head bulges outward from the side surface and extends along the arrangement direction of the cylinder to form the exhaust passage portion, and the side surface of the cylinder head. An exhaust flange portion in which the exhaust collecting portion and the exhaust port are formed protruding outward from the bulging portion, and a plurality of boss portions to which auxiliary machines are attached are formed.
The plurality of boss portions sandwich the first boss portion formed between at least the bulging portion and the lower end portion of the cylinder head and the bulging portion in the height direction of the internal combustion engine. It is provided with a second boss portion formed above the first boss portion.
The auxiliary machine is attached to the side surface of the cylinder head via at least the first boss portion and the second boss portion so as to be adjacent to the exhaust flange portion in the cylinder arrangement direction .
A case flange portion to which a chain case covering a timing chain is connected is formed at an end portion of the cylinder head in the cylinder arrangement direction.
An auxiliary machine mounting structure for an internal combustion engine, wherein the second boss portion is connected to the case flange portion. The first outer cylinder and the second outer cylinder installed on both sides of the cylinder and the cylinder block in the arrangement direction of the cylinders, and the first outer cylinder and the second outer cylinder in the arrangement direction of the cylinders, respectively. It is equipped with an inner cylinder that is sandwiched between cylinders and installed.
The exhaust passage portion passes through the first outer exhaust passage portion extending from the first outer cylinder to the exhaust flange portion via the bulging portion and the bulging portion from the second outer cylinder. A second outer exhaust passage portion extending to the exhaust flange portion and an inner exhaust passage portion extending from the inner cylinder to the exhaust flange portion are provided.
The exhaust collecting portion includes a first exhaust collecting portion that gathers the first outer exhaust passage portion and the second outer exhaust passage portion, and a second exhaust collecting portion that gathers the inner exhaust passage portion. Is equipped with
The exhaust port includes a first exhaust port communicating with the first exhaust collecting portion and a second exhaust port formed below the first exhaust port and communicating with the second exhaust collecting portion. Is equipped with
The bulging portion is formed above the second exhaust port in the height direction of the internal combustion engine.
The auxiliary machine for an internal combustion engine according to claim 1, wherein the first boss portion is formed in a space surrounded by the bulging portion, the lower end portion of the cylinder head, and the exhaust flange portion. Mounting structure. A rib connecting the first boss portion and the second boss portion is formed on the side surface of the cylinder head.
The auxiliary equipment mounting structure for an internal combustion engine according to claim 1 or 2, wherein the rib is connected to the bulge so as to cross the bulge. The exhaust flange portion is connected to the bulging portion and is connected to the bulging portion.
When the rib is used as the first rib, a second rib that extends upward from the first boss portion and toward the exhaust flange portion on the side surface of the cylinder head so as to cross the bulging portion. Ribs and a third rib extending laterally from the second boss portion toward the exhaust flange portion and connected to the tip end portion in the extending direction of the second rib are formed. A triangular rib is formed by the first rib, the second rib, and the third rib.
The auxiliary equipment mounting structure for an internal combustion engine according to claim 3, wherein the triangular rib is connected to the exhaust flange portion via the bulging portion. The auxiliary machine mounting structure for an internal combustion engine according to any one of claims 1 to 4 , wherein the auxiliary machine is composed of a rotary electric machine. An exhaust pipe extending in the height direction of the internal combustion engine is connected to the exhaust flange portion.
The exhaust pipe is installed so as to be separated from the auxiliary machine in the arrangement direction of the cylinders with respect to the exhaust flange portion.
The internal combustion engine according to any one of claims 1 to 5, wherein the auxiliary machine is installed between the exhaust pipe and the case flange portion in the arrangement direction of the cylinders. Auxiliary equipment mounting structure. A third boss portion to which the auxiliary machine is attached is formed on the side surface of the cylinder block along the arrangement direction of the cylinders.
The third boss portion is formed above the central portion in the height direction of the cylinder block.
When the auxiliary machine is used as the first auxiliary machine, a second auxiliary machine connected to the first auxiliary machine by a transmission belt is provided on the side surface of the cylinder block below the first auxiliary machine. It is installed and
A tensioner member that applies tension to the transmission belt is attached to the side surface of the cylinder block.
The tensioner member is a space surrounded by the third boss portion, the second auxiliary machine, the exhaust pipe, and the chain case, and is the first auxiliary machine in the height direction of the internal combustion engine. The auxiliary machine mounting structure for an internal combustion engine according to claim 6 , wherein the auxiliary machine is installed at a position sandwiched between the second auxiliary machine.

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