FR3070060A1 - AUXILIARY MACHINE ATTACHMENT STRUCTURE FOR INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

It is intended to form on the lateral surface (3b) of a yoke (3): - a portion (15) swollen outwardly from the lateral surface (3a), extending in a determined direction of arrangement / cylinder alignment and provided with an exhaust passage portion, - an exhaust flange portion (16) protruding outwardly beyond the bulge portion (15) from the side surface (3b) the cylinder head, provided with an exhaust manifold and exhaust slots (14A, 14B), and - boss portions to which a starter alternator can be attached, in the cylinder arrangement direction. A first boss portion (35) extends between the bulge portion (15) and a lower end portion (3b) of the breech. The alternator attaches laterally via this first boss portion and a second boss portion to be adjacent to the exhaust flange portion in the determined direction.

Description

ATTACHMENT STRUCTURE OF AUXILIARY MACHINE FOR INTERNAL COMBUSTION ENGINE

The present invention relates to an auxiliary machine fixing structure for an internal combustion engine.

An auxiliary machine such as an alternator and an air conditioner compressor is installed in an engine mounted in a vehicle such as an automobile (see JP 7-180542 A). In the engine which is described in JP 7-180542 A, an exhaust pipe is connected to an exhaust manifold projecting outward from a side surface of the engine.

An alternator and an air conditioner compressor are arranged on the side surface of the engine, and the alternator and air conditioner compressor are installed next to the exhaust manifold under the exhaust manifold.

However, in the prior art engine, the exhaust manifold projects outward from the side surface of the engine, and the alternator and compressor of the air conditioner are installed under the exhaust manifold. As a result, the dimension of the motor in the height direction increases. Thus, the engine is large.

The present invention has been made in view of the circumstances described above, and an object thereof is to provide an auxiliary machine attachment structure for an internal combustion engine with which an auxiliary machine can be attached to an internal combustion engine. internal combustion avoiding an increase in the size of the internal combustion engine in the height direction.

According to aspects of this invention, an auxiliary machine fixing structure is proposed for an internal combustion engine comprising a cylinder block comprising a plurality of cylinders arranged in a row and a cylinder head disposed in an upper part of the cylinder block, an exhaust passage evacuating the exhaust gases from the cylinders being formed in an internal part of the cylinder head, and the exhaust passage being configured to include an exhaust passage part (part with exhaust passages also called parts exhaust passage) with passages arranged / provided for each of the cylinders, the exhaust gases discharged from the cylinder flowing in the exhaust passage part, an exhaust manifold assembly disposed on a downstream side of the exhaust passage part and bringing together at least two of the exhaust passage parts for the respective cylinders, and a exhaust slot pement (typically two slots) communicating with the exhaust manifold, open on the side of a lateral surface of the cylinder head in a direction in which the cylinders are arranged, and discharging the exhaust gases flowing in the exhaust manifold exhaust to an outside of the cylinder head, in which a bulged part being swollen outwards from the lateral surface, extending in the direction of arrangement of the cylinders, and being provided with the exhaust passage part, a part an exhaust flange projecting outwardly beyond the bulged portion from the side surface of the cylinder head and being provided with the exhaust manifold and said exhaust slot, and a plurality of boss portions to which a auxiliary machine is fixed are formed on the lateral surface of the cylinder head, at least one of the plurality of boss parts is formed between the bulged part and a part lower end of the cylinder head, and the auxiliary machine is fixed to the lateral surface of the cylinder head via the plurality of boss parts to be adjacent to the exhaust flange part in the direction of arrangement (or direction of alignment) cylinders.

With the present invention as described above, an auxiliary machine can be attached to an internal combustion engine avoiding an increase in the size of the internal combustion engine in the height direction.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view of an engine provided with an auxiliary machine fixing structure according to an embodiment of the present invention;

Figure 2 is a left view of the engine provided with the auxiliary machine fixing structure according to an embodiment of the present invention;

Figure 3 is a right view of the engine provided with the auxiliary machine fixing structure according to an embodiment of the present invention;

Figure 4 is an enlarged view of the vicinity of an exhaust pipe, in front view showing a cylinder block and a cylinder head of an engine provided with an auxiliary machine fixing structure according to one embodiment of the present invention;

FIG. 5 is a diagram illustrating a state where the exhaust pipe, a catalytic converter and a starter alternator are removed, in front view showing a cylinder block and a cylinder head of an engine provided with a fixing structure an auxiliary machine according to an embodiment of this invention;

Figure 6 is a cross-sectional view taken along the direction arrow

VI-VI of Figure 2;

Figure 7 is a cross-sectional view taken along the direction arrow

VII- VII of Figure 4;

Figure 8 is a diagram in which the catalytic converter in the engine provided with the auxiliary machine fixing structure according to an embodiment of the present invention is seen from below;

FIG. 9 is a diagram illustrating a state where a fixing support for an auxiliary machine is fixed, in front view showing a cylinder block and a cylinder head of an engine provided with an auxiliary machine fixing structure according to one mode for carrying out this invention.

EMBODIMENTS AND DETAILED DESCRIPTION

According to embodiments of this invention, an auxiliary machine fixing structure for an internal combustion engine comprises a cylinder block comprising a plurality of cylinders arranged in a row and a cylinder head arranged in an upper part of the cylinder block, a exhaust passage exhausting the exhaust gases from the plurality of cylinders being formed in an inner portion of the cylinder head, and the exhaust passage being configured to include an exhaust passage portion with provided exhaust passages / arranged for each of the cylinders, the exhaust gases discharged from the cylinder flowing in the part with exhaust passages, an exhaust manifold disposed on a downstream side of the part with exhaust passages and bringing together at least two portions of the exhaust passage part for the respective cylinders, and at least one exhaust slit communicating with the exhaust manifold appement, open on the side of a lateral surface of the cylinder head in a direction in which the cylinders are arranged, and discharging the exhaust gases flowing in the exhaust manifold towards an exterior of the cylinder head, in which a part bulged (bulged outward from the side surface), extending in the direction of arrangement of the cylinders, and provided with the exhaust passage portion, an exhaust flange portion projecting outwardly at the beyond the bulged part from the side surface of the cylinder head and provided with the exhaust manifold and the exhaust slot, and a plurality of boss parts to which an auxiliary machine is attached, are formed on the side surface of the and in which at least one of the plurality of boss parts is formed between the bulged part and a lower end part of the cylinder head, and the auxiliary machine is attached the lateral surface of the cylinder head via the plurality of boss portions to be adjacent to the exhaust flange portion in the arrangement direction of the cylinders.

Consequently, an auxiliary machine can be attached to an internal combustion engine avoiding an increase in the size of the internal combustion engine in the height direction.

Optionally, the cylinders include a first outer cylinder and a second outer cylinder installed on respective respective sides in the direction of arrangement of the cylinders in the cylinder block and an inner cylinder installed to be sandwiched between the first outer cylinder and the second outer cylinder in the direction of arrangement of the cylinders. In addition, the portions of the exhaust passage part comprise a first external exhaust passage portion extending from the first external cylinder to the exhaust flange part via the bulged part, a second passage passage portion. external exhaust extending from the second outer cylinder to the exhaust flange portion via the bulged portion, and internal exhaust passage portions extending from the internal cylinder to the exhaust flange portion.

Optionally, the exhaust manifold may comprise a first portion of exhaust manifold bringing together the first portion of external exhaust passage and the second portion of external exhaust passage and a second portion of exhaust manifold bringing together the portions of internal exhaust passage.

Typically, the at least one exhaust slot may include a first exhaust slot communicating with the first exhaust manifold portion and a second exhaust slot formed under the first exhaust slot and communicating with the second portion exhaust manifold.

According to embodiments, one can also have recourse to one or more of the following arrangements:

- The bulged part is formed above the second exhaust slot in the height direction of the internal combustion engine.

- At least one of the plurality of boss parts is formed in a space surrounded by the bulged part, the lower end part of the cylinder head, and the exhaust flange part.

- A housing flange part to which a chain housing covering a timing chain is connected is formed in an end part of the cylinder head in the direction of arrangement of the cylinders.

- the plurality of boss parts comprises a first boss part (typically formed between the bulged part and the lower end part of the cylinder head) and a second boss part formed above the first boss part beyond of the bulged part in the height direction of the internal combustion engine.

- The second boss part is connected to the housing flange part.

- A rib connecting the first boss part and the second boss part is formed on the lateral surface of the cylinder head, this rib being connected to the bulged part to cross the bulged part.

- the exhaust flange part is connected to the bulged part, a triangular rib being formed by a first rib, a second rib and a third rib, the second rib extending towards the exhaust flange part and towards the high from the first part of the boss to cross the bulged part.

- the third rib extends laterally from the second boss part towards the exhaust flange part and being connected to an end part of the second rib in a direction of extension of the second rib formed on the lateral surface of the cylinder head (typically in the case where said rib is the first rib).

- the triangular rib is connected to the exhaust flange part via the bulged part.

- a rotating electric machine constitutes the auxiliary machine.

- An exhaust pipe, extending along the height direction of the internal combustion engine, is connected to the exhaust flange part.

- the exhaust pipe is installed spaced apart, in the direction of arrangement of the cylinders, of the auxiliary machine, by its connection to the exhaust flange part.

- the auxiliary machine is installed, considering the direction of arrangement of the cylinders, between the exhaust pipe and the housing flange part.

- A third boss part, to which the auxiliary machine is fixed, is formed on a lateral surface of the cylinder block in the direction of arrangement of the cylinders, the third boss part being preferably formed above a middle part height of the cylinder block.

said auxiliary machine forms a first auxiliary machine, and a second auxiliary machine (connected to this first auxiliary machine by a transmission belt) is fixed to the lateral surface of the cylinder block in a lower part of the first auxiliary machine.

- A tensioning member intended to tension the transmission belt is fixed to the lateral surface of the cylinder block.

the tensioning member is installed in a space surrounded by the third boss part, the second auxiliary machine, the exhaust pipe and the chain casing, and in a position sandwiched by the first auxiliary machine and the second machine auxiliary in the height direction of the internal combustion engine.

Hereinafter, an exhaust structure for an internal combustion engine according to embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

Figures 1 to 9 are diagrams illustrating the exhaust structure of an internal combustion engine according to embodiments of the present invention. Regarding the up-down, front-back and left-right directions of Figures 1 to 9, the left-right direction is the direction of arrangement of the cylinders and the up-down direction is the direction of the engine height in the case where the installation side of the exhaust pipe is the front in the direction orthogonal to the direction following the cylinder arrangement direction.

First, a particular configuration will be described.

In Figures 1 and 2, an engine 1 as an internal combustion engine is installed in the engine compartment (not shown) of a vehicle. The engine 1 comprises a cylinder block 2, a cylinder head 3 fixed to the upper part of the cylinder block 2, and an oil sump 4 fixed to the lower part of the cylinder block 2.

A plurality of cylinders 2A, 2B, 2C and 2D (see Figure 6) are arranged 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. Pistons (not shown) are arranged in cylinders 2A, 2B, 2C and 2D, and the pistons reciprocate in the up-down direction relative to the cylinders.

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

In the cylinder head 3 are for example arranged a plurality of intake ports 3A (see FIG. 6), a plurality of intake valves (not shown) opening and closing the intake ports 3A, exhaust ports 3B (see Figure 6), and a plurality of exhaust valves (not shown) opening and closing the exhaust ports 3B. The intake ports 3A introduce air into the cylinders 2A, 2B, 2C and 2D, and the exhaust ports 3B evacuate the exhaust gases from the cylinders after combustion in the cylinders 2A, 2B, 2C and 2D.

An intake camshaft which has an intake cam (not shown) and an exhaust camshaft which has an exhaust cam (not shown) are rotatably arranged in the cylinder head 3, and, the valves intake and exhaust valves are opened and closed by the intake cam and the exhaust cam.

In Figure 1, a chain case 5 (see Figure 3) is arranged on the right side surfaces of the cylinder block 2 and the cylinder head 3, and the chain case 5 covers a timing chain 6 (indicated by an imaginary line in Figure 3) arranged on the right side surfaces of the cylinder block 2 and the cylinder head 3.

In Figures 4 and 5, housing flange parts 2F and 3F are formed in the right end parts of the cylinder block 2 and the cylinder head 3, and, the chain case 5 is fixed to the housing flange parts 2F and 3F by bolts 20 (see figure 4). The right end part of the cylinder head 3 according to this embodiment constitutes an end part of the cylinder head in the direction of arrangement of the cylinders according to the present invention.

In FIG. 3, the timing chain 6 interconnects a crankshaft pulley 46 disposed on the crankshaft 2S and cam pulleys 17A and 17B respectively disposed on the intake camshaft and the exhaust camshaft and transmits the power from 2S crankshaft to intake camshaft and exhaust camshaft.

In Figure 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) to establish a plurality of variable speed levels and changes the rotational speed motor 1.

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

In FIGS. 1 and 4, an exhaust pipe 8 is fixed to the cylinder head 3, and this exhaust pipe 8 is installed on a lateral surface 2a of the cylinder block 2 and a lateral surface 3a of the cylinder head 3 in the direction of arrangement of cylinders 2A, 2B, 2C and 2D. The exhaust gases which are discharged through the exhaust port 3B is introduced into the exhaust pipe 8.

A catalytic converter 9 is fixed 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 catalytic converter 9 evacuates the gases exhaust exhausted from the exhaust pipe 8 to an exhaust pipe (not shown) disposed on the downstream side after purification. The exhaust pipe 8 and the catalytic converter 9, in such an embodiment, can constitute the exhaust pipe according to the invention.

In FIG. 6, an exhaust passage 11 is formed in the internal part of the cylinder head 3. The exhaust passage 11 is provided with exhaust passage parts 12A, 12B, 12C and 12D, with manifold parts. exhaust 13A and 13B, and first and second exhaust slots 14A and 14B (see Figure 5).

The exhaust passage parts 12A, 12B, 12C and 12D communicate respectively with the cylinders 2A, 2B, 2C and 2D via the exhaust orifices 3B. The exhaust passage parts 12B and 12C are formed below the exhaust passage parts 12A and 12D, and the exhaust gases discharged from the cylinders 2A, 2B, 2C and 2D flow through the passage parts exhaust 12A, 12B, 12C and 12D respectively. In FIG. 6, the exhaust gases flowing through the exhaust passage 11 are indicated by an arrow W.

The exhaust manifold portion 13A is disposed on the downstream side of the exhaust passage portions 12A and 12D. The exhaust manifold part 13A collects the exhaust gases flowing through the exhaust passage parts 12A and 12D by bringing together the exhaust passage parts 12A and 12D.

The exhaust manifold portion 13B is formed below the exhaust manifold portion 13A (see Figure 7) and is disposed on the downstream side of the exhaust passage portions 12B and 12C. The exhaust manifold part 13B collects the exhaust gases flowing through the exhaust passage parts 12B and 12C by bringing together the exhaust passage parts 12B and 12C.

The first exhaust slot 14A is open on the lateral surface 3a of the cylinder head 3 and communicates with the exhaust manifold part 13A. The second exhaust slot 14B is open on the lateral surface 3a of the cylinder head 3 below the first exhaust slot 14A and communicates with the exhaust manifold part 13B.

Consequently, the exhaust gases evacuated from the cylinders 2A and 2D are evacuated outside the cylinder head 3 from the first exhaust slot 14A through the exhaust manifold part 13A after flow through the passage parts 12A and 12D through the exhaust ports 3B.

The exhaust gases evacuated from cylinders 2B and 2C are evacuated outside the cylinder head 3 from the second exhaust slot 14B through the exhaust manifold part 13B after flow through the exhaust passage parts 12B and 12C through the exhaust ports 3B.

In FIGS. 4 and 5, a bulged part 15 is formed on the lateral surface 3a of the cylinder head 3. The bulged part 15 projects outwards from the lateral surface 3a of the cylinder head 3 and extends in the direction of arrangement of cylinders 2A, 2B, 2C and 2D. The exhaust passage parts 12A and 12D positioned above the exhaust passage parts 12B and 12C are formed in the bulge part

15.

In FIG. 5, an exhaust flange part 16 is formed on the lateral surface 3a of the cylinder head 3, and the exhaust flange part 16 projects outwards beyond the bulged part 15 of the surface lateral 3a of the cylinder head 3 (see FIG. 6). As illustrated in FIG. 7, the exhaust manifold parts 13A and 13B and the first and second exhaust slots 14A and 14B are formed in the exhaust flange part 16.

In FIG. 5, the bulged part 15 is inclined upwards on both sides in the direction of arrangement of the cylinders towards the exhaust flange part 16 and is connected to the exhaust flange part 16.

In FIG. 6, the cylinders 2A and 2D are installed on the two respective sides of the cylinder block 2 in the direction of arrangement of the cylinders, the cylinder 2A constitutes the first external cylinder according to the present invention and the cylinder 2D constitutes the second cylinder exterior according to the present invention.

The cylinders 2B and 2C are installed so as to be sandwiched by the cylinders 2A and 2D in the direction of arrangement of the cylinders and the cylinders 2B and 2C constitute an internal cylinder according to the present invention.

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

The exhaust passage portion 12B extends from the cylinder 2B to the exhaust flange portion 16 and can constitute the internal exhaust passage portion according to the present invention. The exhaust passage portion 12C extends from the cylinder 2C to the exhaust flange portion 16 and can constitute the internal exhaust passage portion according to the present invention.

The exhaust manifold part 13A brings together the exhaust passage part / portion 12A and the exhaust passage part / portion 12D and constitutes the first exhaust manifold part according to the present invention. The exhaust manifold part 13B formed below the exhaust manifold part 13A brings together the exhaust passage part / portion 12B and the exhaust passage part / portion 12C and constitutes the second manifold part d exhaust according to the present invention.

The first exhaust slot 14A communicating with the exhaust manifold portion 13A and the second exhaust slot 14B communicating with the exhaust manifold portion 13B below the first exhaust slot 14A may constitute the au minus an exhaust slot according to the present invention.

Referring to Figure 7, the upstream end of the exhaust pipe 8 is fixed to the exhaust flange portion 16. The exhaust pipe 8 has a first passage of exhaust pipe 22 and a second passage of exhaust pipe 23 separated by a partition wall 21. Here, upstream and downstream mean upstream and downstream with respect to the direction of flow of the exhaust gases.

The first exhaust pipe passage 22 communicates with the first exhaust slot 14A, and the exhaust gases are discharged from the first exhaust slot 14A to the first exhaust pipe passage 22. The second passage exhaust pipe 23 communicates with the second exhaust slot 14B, and the exhaust gases are discharged from the second exhaust slot 14B to the second exhaust pipe passage 23.

The first exhaust pipe passage 22 is formed above the second exhaust pipe passage 23 and outwardly away from the side surface 3a of the cylinder head 3 relative to the second exhaust pipe passage exhaust 23.

The exhaust pipe 8 curves downwards and extends, after having extended linearly outwards from the lateral surface 3a of the cylinder head 3.

In other words, the exhaust pipe 8 according to this embodiment comprises a linear part 31 which extends linearly outwards from the exhaust flange part 16 and a curved part 32 which has an internal surface curved 32a curving downwards from the linear part 31 and facing the lateral surface 2a of the cylinder block 2 and an external curved surface 32b positioned on the side opposite to the lateral surface 2a of the cylinder block 2.

The curved part 32 is curved so that a distance L between a cylinder axis 2L and an end part 32c in the direction of extension of the curved external surface 32b is short compared to a maximum distance Lmax at level of 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. Here, the cylinder axis is based on the axis 2L of the cylinder 2B or of the cylinder 2C formed near the exhaust pipe 8, among the cylinders 2A, 2B, 2C and 2D.

In other words, the vicinity of the center of the direction of extension of a central axis C1 of the first exhaust pipe passage 22 can extend to a first central point 01, and the imaginary line passing through the first central point 01 in the up-down direction is an imaginary first line L1. In addition, the imaginary line intersecting the central axis C1, passing through an open downstream end 22a of the first exhaust pipe passage 22 in the up-down direction is a second imaginary line L2.

In the exhaust pipe 8 according to this embodiment, the curved part 32 is curved so that the second imaginary line L2 is close to the lateral surface 3a of the cylinder head 3 relative to the first imaginary line L1.

In Figures 7 and 8, an exhaust sensor 10 is disposed in the catalytic converter 9, and the exhaust sensor 10 detects the amount of oxygen in the exhaust gas. In FIG. 7, the exhaust sensor 10 faces the open downstream end 22a of the first exhaust pipe passage 22 and is installed on the side of the partition wall 21.

Specifically, a third imaginary line L3 is the imaginary line which extends along the central axis C1 on the downstream side of the first exhaust pipe passage 22 through an inner peripheral surface of end portion 32e of a curved inner peripheral surface 32d on the back of the curved outer surface 32b. In addition, a fourth imaginary line L4 is the imaginary line which extends along a central axis C2 on the downstream side of the second exhaust pipe passage 23 through a lower end portion 21a of the partition wall. 21 facing the lateral surface 2a of the cylinder block 2.

The exhaust sensor 10 according to this embodiment is installed between the third imaginary line L3 and the fourth imaginary line L4.

The partition wall 21 is configured to include a first partition wall portion 21A extending linearly outward from the exhaust flange portion 16, a second partition wall portion 21B curving downward from the first partition wall part 21A and a third partition wall part 21C extending linearly from the second partition wall part 21 B.

A wall thickness T2 of the second partition wall part 21B is greater than a wall thickness T1 of the first partition wall part 21A and a wall thickness T3 of the third partition wall part 21C is less than l wall thickness T2 of the second part of the partition wall 21 B. In other words, the partition wall 21 is formed so that the thickness of the plate gradually decreases towards the downstream side after the thickness of the plate has gradually increased from the upstream side to the downstream side.

The first exhaust pipe passage 22 and the second exhaust pipe passage 23 are formed so that the opening sections thereof are larger on the downstream sides connected to the catalytic converter 9 than on the upstream sides connected to the exhaust flange part 16.

In FIGS. 4 and 5, a first boss part 35 and a second boss part 36 are formed on the lateral surface 3a of the cylinder head 3, and a third boss part 37 is formed on the lateral surface 2a of the cylinder block 2 The first boss part 35 and the second boss part 36 according to this embodiment can constitute the boss part according to the present invention.

In Figure 5, the first boss portion 35 and the second boss portion 36 are disposed adjacent to the exhaust flange portion 16 in the direction of cylinder arrangement. The bulged part 15 is formed above the second exhaust slot 14B in the height direction of the engine 1, and the first boss part 35 is formed in a space 52 surrounded by the bulged part 15, a part d the lower end 3b of the cylinder head 3 and the exhaust flange part 16.

The exhaust flange part 16 is connected to the bulged part 15 and extends upwards and downwards beyond the bulged part 15 in the height direction of the engine 1.

The second boss part 36 is formed above the first boss part 35 through the bulged part 15 in the height direction of the engine 1 and is connected to the casing flange part 3F of the cylinder head 3.

The third boss part 37 is formed in the cylinder block 2 to align with the second boss part 36 in the height direction of the engine 1. As illustrated in FIG. 5, the third boss part 37 is formed at the above a middle part C3 of the cylinder block 2 in the height direction.

A mounting support 42 of a starter alternator (integrated starter alternator) 41 illustrated in FIG. 3 is fixed by bolts 43 to the first boss part 35, to the second boss part 36 and to the third boss part (see figure 9).

In FIG. 9, a boss part 42A is formed in the fixing support 42, and the boss part 42A extends in the left-right direction of the motor 1.

In FIG. 3, an upper side fixing part 41A and a lower side fixing part 41B are arranged in the starter alternator 41. The upper side fixing part 41A is arranged in the upper part of the alternator. starter 41, and the fixing part of the upper side 41A is fixed by a bolt 44A to the boss part 42Adu of the fixing support 42.

The fixing part of the lower side 41B is arranged in the lower part of the starter alternator 41, and the fixing part of the lower side 41B is fixed by a bolt 44B to the cylinder block 2.

Thus, the starter alternator 41 is attached to the lateral surface 3a of the cylinder head 3 via the first boss part 35 and the second boss part 36 (see FIG. 1) so that the fixing support 42 is next to the exhaust flange portion 16 in the direction of arrangement of the cylinders (front-rear direction). The starter alternator 41 according to this embodiment is configured to include the fixing support 42.

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

In FIG. 3, the starter alternator 41 is provided with an engine pulley 45, and the engine pulley 45 is connected by means of a transmission belt 47 to the crankshaft pulley 46 mounted on the part d right end of the 2S crankshaft.

In FIG. 1, an air conditioner compressor 49 is fixed to the lateral surface 2a of the cylinder block 2 in the lower part of the starter alternator 41. In FIG. 3, the air conditioner compressor 49 is provided with a compressor pulley 49A , and the compressor pulley 49A is connected to the crankshaft pulley 46 by the transmission belt 47.

The starter alternator 41 functions as an electric motor driving the rotation of the motor 1 via the transmission belt 47 by turning thanks to the electric power supply and functions as a generator converting a rotational force coming from the transmission belt 47 from the 2S crankshaft in electrical energy.

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

In FIGS. 1 and 3, a tensioning member 50 is disposed on the lateral surface 2a of the cylinder block 2. The tensioning member 50 is provided with a tension roller 50A and a tension support 50B which rotatably supports the tension roller 50A.

The tension roller 50A is in contact with the transmission belt 47 and puts the transmission belt 47 under tension. The tension support 50B is fixed to the starter alternator 41 by a bolt 51. Thus, the tensioning member 50 is stably supported by the starter alternator 41 and is capable of tensioning the transmission belt 47 by accepting a reaction force of the transmission belt 47.

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

An automatic tensioner 54 is disposed on the side surface 2a of the cylinder block 2, and the automatic tensioner 54 adjusts the tension of the transmission belt 47 using hydraulic pressure or the like. The starter alternator 41 according to this embodiment constitutes the auxiliary machine, the first auxiliary machine and the rotary electrical machine according to the present invention, and the air conditioner compressor 49 constitutes the second auxiliary machine according to the present invention.

In Figures 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 is used when a core is removed in a process to form a water jacket (not shown) of the cylinder head 3. The boss portion 38 is closed by a plug 38A, and the plug 38A is capable of preventing a coolant from leaking outside the cylinder head 3 from the jacket d 'water.

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 interconnects the first boss portion 35 and the second boss portion 36, and the first rib 55 is connected to the bulged part 15 to pass through the bulged part 15.

The second rib 56 extends towards the exhaust flange part 16 and upwards from the first boss part 35 to pass through the bulged part 15, and the end part of the second rib 56 in its direction of extension is connected to the boss portion 38.

The third rib 57 extends laterally from the second boss part 36 towards the exhaust flange part 16, and the end part of the third rib 57 in its direction of extension is connected to the boss part 38 As a result, the end part of the second rib 56 in its direction of extension and the tip part of the third rib 57 in its direction of extension are interconnected by means of the boss part 38.

A rib which has a triangular shape (hereinafter called a triangular rib 58) is formed on the lateral 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 connected to the exhaust flange part 16 via the bulged part 15.

In FIG. 1, the exhaust pipe 8 and the catalytic converter 9 are installed in the direction of cylinder arrangement and offset from the starter alternator 41, on the exhaust flange part 16, and , the starter alternator 41 (or more generally an auxiliary machine) is installed, considering the direction of arrangement of the cylinders, between the exhaust pipe 8 and the catalytic converter 9 and between the housing flange parts 2F and 3F (see figure 4). The exhaust pipe / duct typically extends in the height direction of the engine 1, and can be connected to one side of the cylinder head 3, by a lateral connection to the exhaust flange portion 16.

As described above, in the attachment structure of the auxiliary machine of the engine 1 according to this embodiment, the bulged part 15 is bulged outwards from the lateral surface 3a of the cylinder head 3, extends in the direction d arrangement of the cylinders and is provided with the exhaust passage parts 12A and 12D, the exhaust flange part 16 projects outwards beyond the bulged part 15 of the lateral surface 3a of the cylinder head 3 and is provided with the exhaust manifold portions 13A and 13B and the first and second exhaust slots 14A and 14B, and the first boss portion 35 and the second boss portion 36 to which the starter alternator 41 is attached are formed on the lateral surface 3a of the cylinder head 3 in the direction of arrangement of the cylinders.

The first boss part 35 is formed between the bulged part 15 and the lower end part 3b of the cylinder head 3, and the starter alternator 41 is fixed to the lateral surface 3a of the cylinder head 3 via the first boss part 35 and the second the boss portion 36 to be adjacent to the exhaust flange portion 16 in the direction of arrangement of the cylinders.

As a result, an exhaust manifold protruding outward from the lateral surface 3a of the cylinder head 3 does not have to be disposed on the lateral surface 3a of the cylinder head 3, and that the starter alternator 41 does not have to avoid an exhaust manifold by being attached to the cylinder head 3.

Consequently, the starter alternator 41 can be fixed upwards on the lateral surface 3a of the cylinder head 3. Thus, the space below the starter alternator 41 can be extended more easily than in the engine according to the related art, and the degree of freedom of installation of the air conditioner compressor 49 installed below the starter alternator 41 can be improved.

Furthermore, since the starter alternator 41 can be installed upwards on the lateral surface 3a of the cylinder head 3, an increase in the dimension of the motor 1 in the height direction can be avoided in the case where the alternator starter motor 41 and air conditioner compressor 49 are installed to overlap in the height direction of motor 1.

As described above, in the auxiliary machine fixing structure for the engine 1 according to this embodiment, the starter alternator 41 can be fixed to the engine 1, avoiding an increase in the size of the engine 1 in the direction of the height.

In addition, in a case where the first boss portion 35 and the second boss portion 36 for fixing the starter alternator 41 are formed on an exhaust manifold projecting outward from a side surface of a cylinder head as in the engine according to the prior art, the starter alternator 41 can project significantly outwards from the lateral surface of the cylinder head and the dimension of the engine 1 in the front-rear direction can increase.

In the auxiliary machine fixing structure for the engine 1 according to this embodiment, on the contrary, the first boss part 35 and the second boss part 36 for fixing the starter alternator 41 are formed on the lateral surface 3a of the cylinder head 3, and thus the starter alternator 41 can be prevented from projecting significantly outward from the lateral surface 3a of the cylinder head 3 and an increase in the size of the engine 1 in the front-rear direction can be avoided.

In addition, the first boss portion 35 and the second boss portion 36 are formed adjacent to the bulged, high-rigidity portion 15, and thus the starter alternator 41 can be securely attached to the side surface 3a of the cylinder head 3 via the mounting bracket. Thus, the starter alternator 41 can be stably supported by the cylinder head 3 by suppressing the transmission of the vibration from the starter alternator 41 to the engine 1.

Furthermore, in the auxiliary machine fixing structure for the engine 1 according to this embodiment, the cylinders include the cylinders 2A and 2D installed on the respective two sides in the direction of arrangement of the cylinders in the cylinder block 2 and the installed cylinders 2B and 2C sandwiched by cylinders 2A and 2D in the direction of arrangement of the cylinders.

The exhaust passage parts formed in the internal part of the cylinder head 3 comprise the exhaust passage part 12A extending from the cylinder 2A to the exhaust flange part 16 via the bulged part 15, the part 12D exhaust passage extending from the cylinder 2D to the exhaust flange portion 16 via the bulged portion 15, and, the exhaust passage portions 12B and 12C extending from the cylinders 2B and 2C up 'to the exhaust flange part 16.

The exhaust manifold parts formed in the internal part of the cylinder head 3 include the exhaust manifold part 13A bringing together the exhaust passage part 12A and the exhaust passage part 12D, and, the collector part exhaust 13B bringing together the exhaust passage part 12B and the exhaust passage part 12C.

The exhaust slots formed in the internal part of the cylinder head 3 comprise the first exhaust slot 14A communicating with the exhaust manifold portion 13A and the second exhaust slot 14B formed under the first exhaust slot 14A and communicating with the exhaust manifold part 13B.

The bulged part 15 is formed above the second exhaust slot 14B in the height direction of the engine 1, and the first boss part 35 is formed in a space 52 surrounded by the bulged part 15, the part d the lower end 3b of the cylinder head 3 and the exhaust flange part 16.

The starter alternator 41 can be installed in a higher position relative to the cylinder head 3 since the bulged part 15 is formed above the second exhaust slot 14B, with the arrangement (typically one above on the other) in the height direction of the motor 1 of the first exhaust slot 14A and the second exhaust slot 14B, and the first boss part 35 is formed in the space 52 surrounded by the bulged part 15, the lower end portion 3b of the cylinder head 3 and the exhaust flange portion 16 as described above.

Consequently, the space under the starter alternator 41 can be further extended and the degree of freedom of installation of the air conditioner compressor 49 installed under the starter alternator 41 can be improved more effectively. Consequently, an increase in the size of the motor 1 in the height direction can be more effectively avoided.

In addition, in the attachment structure of the auxiliary machine of the engine 1 according to this embodiment, the casing flange part 3F to which the chain casing 5 connected to the timing chain 6 is connected, is formed in the end part. right of the cylinder head 3 in the direction of arrangement of the cylinders.

The first boss part 35 formed between the bulged part 15 and the lower end part 3b of the cylinder head 3 and the second boss part 36 formed above the first boss part 35 beyond the bulged part 15 in the height direction of the engine 1 are formed on the lateral surface 3a of the cylinder head 3, and, the second boss part 36 is connected to the casing flange part 3F.

As a result, the first boss part 35 can be adjacent to the high-rigidity bulged part 15 and the second boss part 36 can be connected to the high stiffness crank flange part 3F, and the rigidity of the first part boss 35 and the second boss portion 36 can be improved more effectively.

Consequently, the starter alternator 41 can be fixed even more firmly to the lateral surface 3a of the cylinder head 3 via the fixing support 42. Consequently, the starter alternator 41 can be supported even more stably by the cylinder head 3 by more effectively suppressing the transmission of vibration from the starter alternator 41 to the engine 1.

In addition, in the attachment structure of the auxiliary machine 1 according to this embodiment, the first rib 55 interconnecting the first boss part 35 and the second boss part 36 is formed on the lateral surface 3a of the cylinder head 3, and , the first the rib 55 is connected to the bulged part 15 to cross the bulged part

15.

Consequently, the rigidity of the first boss part 35 and the second boss part 36 can be further improved by the first rib 55 and the bulging part 15, and the starter alternator 41 can be even more firmly fixed to the lateral surface 3a of the cylinder head 3 via the fixing support 42.

In addition, in the auxiliary machine fixing structure for the engine 1 according to this embodiment, the exhaust flange part 16 is connected to the bulged part 15. In addition, the triangular rib 58 is formed on the lateral surface. 3a of the cylinder head 3 by the first rib 55, the second rib 56 extending towards the exhaust flange part 16 and upwards from the first boss part 35 to cross the bulged part 15 and the third rib 57 s extending laterally from the second boss portion 36 to the exhaust flange portion 16 and connected via the boss portion 38 to the end portion of the second rib 56 in the direction of extension thereof. In addition, the triangular rib 58 is connected to the exhaust flange part 16 via the bulged part 15.

As a result, the rigidity of the lateral surface 3a of the cylinder head 3 can be improved by the triangular rib 58 in addition to the rigidity of the first boss part 35 and the second boss part 36. Consequently, the alternator starter 41 can be fixed even more firmly to the lateral surface 3a of the cylinder head 3 via the fixing support 42.

In addition, in the auxiliary machine fixing structure for the engine 1 according to this embodiment, the starter alternator 41 constitutes an auxiliary machine. The exhaust pipe 8 and the catalytic converter 9 are not installed above the starter alternator 41, and the exhaust pipe 8 and the catalytic converter 9 are installed adjacent to the starter alternator 41 in the left-right direction. Consequently, exposure of the exhaust pipe 8 and the catalytic converter 9 to the heat generated and rising from the starter alternator 41 can be avoided.

As a result, it can be prevented that the exhaust gases flowing in the exhaust pipe 8 become excessively hot, and thermal damage to the exhaust pipe 8 and the catalytic converter 9 can be avoided. As a result, early deterioration of the exhaust pipe 8 and the catalytic converter 9 (or a similar exhaust pipe) can be avoided.

In addition, in the attachment structure of the auxiliary machine of the engine 1 according to this embodiment, the exhaust pipe 8 connected to the exhaust flange portion 16 is installed separately (offset in the direction of arrangement of the cylinders) of the starter alternator 41, in relation to the exhaust flange portion 16, while the starter alternator 41 is installed between the exhaust pipe 8 and the catalytic converter 9 and the flange portion of casing 3F in the direction of arrangement of the cylinders.

Consequently, the starter alternator 41 can be installed close to the side where the exhaust pipe 8 and the catalytic converter 9 are located, relative to the crankcase flange part 3F. Thus, the size of the motor 1 in the left-right direction can be shortened and the size of the motor 1 can be reduced.

In addition, in the auxiliary machine fixing structure for the engine 1 according to this embodiment, the third boss portion 37 to which the starter alternator 41 is fixed is formed on the lateral surface 2a of the cylinder block 2 according to the direction of arrangement of the cylinders, and, the third boss portion 37 is formed above the middle portion C3 of the cylinder block 2 in the height direction.

In addition, the air conditioner compressor 49 connected to the starter alternator 41 by the transmission belt 47 is fixed to the lateral surface 2a of the cylinder block 2 in the lower part of the starter alternator 41.

In addition, the tensioning member 50 subjecting the transmission belt 47 to a tension is fixed to the lateral surface 2a of the cylinder block 2, and, the tensioning member 50 is installed in a space 53 surrounded by the third boss part. 37, the air conditioner compressor 49, the catalytic converter 9 and the chain case 5 and in a sandwiched position between the starter alternator 41 and the air conditioner compressor 49 in the height direction of the engine 1.

Consequently, the tensioning member 50 is installed in the space 53 sandwiched by the starter alternator 41 and the air conditioner compressor 49 in the space under the starter alternator 41 which is more extensive than in the engine. according to the prior art, and therefore the starter alternator 41 can be fixed to the cylinder head 3 with the engine 1, the size of which is reduced.

In addition, the air conditioner compressor 49 is installed under the starter alternator 41, and thus the tensioning member 50 can be covered from below by the air conditioner compressor 49. As a result, the air conditioner compressor 49 can collide with flying stones and the like during the movement of the vehicle. Therefore, a direct collision between the tensioning member 50 and thrown stones and the like can be prevented and the tensioning member 50 can be protected.

Although the starter alternator 41 constitutes the auxiliary machine according to this embodiment, this invention is not limited thereto and an engine or an alternator can constitute the auxiliary machine instead of the latter.

Furthermore, although the end part of the second rib 56 in its direction of extension and the end part of the third rib 57 in its direction of extension are connected to the boss part 38 according to this mode of embodiment, the end part of the second rib 56 in the direction of extension thereof and the end part of the third rib 57 in the direction of extension thereof can be directly interconnected, alternatively .

It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms than those described without departing from the scope of the invention as claimed.

Claims (8)

1. Auxiliary machine fixing structure for an internal combustion engine (1) comprising: - a cylinder block (2) comprising a plurality of cylinders (2A, 2B, 2C, 2D) arranged in a row; and - a cylinder head (3) arranged in an upper part of the cylinder block (2), - an exhaust passage (11) evacuating the exhaust gases from the cylinders being formed in an internal part of the cylinder head, and the exhaust passage being configured to include an exhaust passage part (12A, 12B, 12C , 12D) arranged for each of the cylinders, the exhaust gases discharged from the cylinder flowing in the part with exhaust passages, an exhaust manifold (13A, 13B) arranged on a downstream side of the part with passages d 'exhaust (12A, 12B, 12C, 12D) and bringing together at least two portions of the exhaust passage portion for the respective cylinders (2A, 2B, 2C, 2D), and at least one exhaust slot (14A, 14B) communicating with the exhaust manifold (13A, 13B), open on the side of a lateral surface (3a) of the cylinder head (3) in a direction in which the cylinders are arranged, and discharging the exhaust gases s flowing through the exhaust manifold (13A, 13B) to an exterior of the cul enough, and in which: a bulged part (15), bulged outwards from the lateral surface (3a), extending in the direction of arrangement of the cylinders and being provided with the exhaust passage part (12A, 12B, 12C, 12D ), an exhaust flange part (16) projecting outwards beyond the bulged part (15) from the lateral surface (3a) of the cylinder head (3) and provided with the manifold part exhaust (13A, 13B) and the exhaust slot (14A, 14B), and a plurality of boss parts (35, 36, 38) to which an auxiliary machine is attached, are formed on the side surface (3a) of the cylinder head (3), at least one of the plurality of boss parts (35, 36, 38) is formed between the bulged part (15) and a lower end part (3b) of the cylinder head, and the auxiliary machine is fixed to the lateral surface (3a) of the cylinder head (3) via the plurality of boss parts (35, 36, 38) to be adjacent to the bridle part e exhaust (16) in the direction of arrangement of the cylinders. 2. An auxiliary machine fixing structure for an internal combustion engine according to claim 1, in which the cylinders (2A, 2B, 2C, 2D) comprise a first external cylinder (2A) and a second external cylinder (2D) installed respective two sides in the direction of arrangement of the cylinders in the cylinder block (2) and an inner cylinder (2B, 2C) installed to be sandwiched between the first outer cylinder (2A) and the second outer cylinder (2d) in the direction of arrangement of the cylinders, the portions of the exhaust passage part (12A, 12B, 12C, 12D) have a first external exhaust passage portion (12A) extending from the first external cylinder (2A ) to the exhaust flange portion (16) via the bulge portion (15), a second external exhaust passage portion (12D) extending from the second outer cylinder (2D) to the exhaust flange portion (16) via the bulging part ( 15), and internal exhaust passage portions (12B, 12C) extending from the internal cylinder (2B, 2C) to the exhaust flange portion (16), the exhaust manifold (13A , 13B) comprises a first part of the exhaust manifold (13A) bringing together the first portion of the external exhaust passage (12A) and the second portion of the external exhaust passage (12D) and a second part of the exhaust manifold (13B) bringing together the internal exhaust passage portions (12B, 12C), the at least one exhaust slot (14A, 14B) has a first exhaust slot (14A) communicating with the first manifold portion d exhaust (13A) and a second exhaust slot (14B) formed under the first exhaust slot (14A) and communicating with the second exhaust manifold part (13B), the bulged part (15) is formed at above the second exhaust slot (14B) in the height direction d an internal combustion engine (1), and at least one of the plurality of boss parts is formed in a space surrounded by the bulged part (15), the lower end part (3b) of the cylinder head, and the part exhaust flange (16). 3. An auxiliary machine fixing structure for an internal combustion engine according to claim 1 or 2, wherein a casing flange part (3F) to which a chain casing (5) covering a timing chain (6) is connected is formed in an end part of the cylinder head (3) in the direction of arrangement of the cylinders (2A, 2B, 2C, 2D), the plurality of boss parts has a first boss part (35) formed between the bulged part (15) and the lower end part (3b) of the cylinder head and a second boss part (36) formed above the first boss part (35) beyond the bulged part (15 ) in the height direction of the internal combustion engine, and the second boss part (36) is connected to the housing flange part (3F). 4. An auxiliary machine attachment structure for an internal combustion engine according to claim 3, wherein a 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), and the rib (55) is connected to the bulged part (15) to cross the bulged part. 5. An auxiliary machine fixing structure for an internal combustion engine according to claim 4, in which the exhaust flange part (16) is connected to the bulged part (15), a triangular rib is formed by a first rib. (55), a second rib (56) and a third rib (57), the second rib extending toward the exhaust flange portion (16) and upward from the first boss portion (35) to pass the bulged part (15) and the third rib (57) extending laterally from the second boss part (36) towards the exhaust flange part (16) and connected to an end part of the second rib ( 56) in a direction of extension of the second rib (56) formed on the lateral surface (3a) of the cylinder head, in the case where said rib (55) is the first rib, and the triangular rib is connected to the part exhaust flange (16) via the bulged part (15). 6. An auxiliary machine fixing structure for an internal combustion engine according to any one of claims 1 to 5, in which a rotary electric machine (41) constitutes the auxiliary machine. 7. An auxiliary machine fixing structure for an internal combustion engine according to claim 3, wherein an exhaust pipe (8, 9) extending in the height direction of the internal combustion engine (1) is connected at the exhaust flange part (16), the exhaust pipe (8, 9) is installed spaced apart, in the direction of arrangement of the cylinders, of the auxiliary machine, being connected to the flange part exhaust (16), and the auxiliary machine is installed, considering the direction of arrangement of the cylinders, between the exhaust pipe (8, 9) and the housing flange part (3F). 8. An auxiliary machine fixing structure for an internal combustion engine according to claim 7, wherein a third boss portion (37) to which the auxiliary machine (41) is fixed is formed on a side surface (2a) of the block. -cylinders (2) in the direction of arrangement of the cylinders, the third boss part (37) is formed above a middle part (C3) of the cylinder block (2) in the height direction, said auxiliary machine forms a first auxiliary machine, and a second auxiliary machine (49) connected to this first auxiliary machine (41) by a transmission belt (47) is fixed to the lateral surface (2a) of the cylinder block (2) in a lower part of the first auxiliary machine (41), a tensioning member (50) tensioning the transmission belt (47) is fixed to the lateral surface (2a) of the cylinder block, and the tensioning member (50) is installed in a space surrounded by the third the boss part (37), the second auxiliary machine (49), the exhaust pipe (8, 9) and the chain case (5), and in a position sandwiched by the first auxiliary machine (41) and the second auxiliary machine (49) in the height direction of the internal combustion engine (1).