JP4139842B2 - Vertical multi-cylinder engine - Google Patents

Description

The present invention relates to a vertical multi-cylinder engine.

Conventionally, as a vertical multi-cylinder engine, as in the present invention, a side water passage along the longitudinal direction of the cylinder block is provided on one side wall of the cylinder block, a cylinder jacket is provided in the cylinder block, and cooling water from the radiator is supplied to the side water passage. There are some which are introduced into the cylinder jacket.
Conventionally, in this type of engine, the outlet of the side water channel faces the upper part of the cylinder jacket.

The above prior art has the following problems.
<Problem> Warm-up and cooling of the upper and lower portions of each cylinder wall are uneven.
Since the outlet of the side water channel faces the upper part of the cylinder jacket, most of the cooling water that has flowed out of the outlet of the side water channel flows into the upper part of the head jacket without passing through the lower part of the cylinder jacket. Cooling water stagnates, and warming up and cooling of the upper and lower portions of each cylinder wall become uneven. For this reason, during the warm-up operation, the lower portion of each cylinder wall is difficult to warm, and the piston may be seized. Further, during normal operation, the lower portion of each cylinder wall is undercooled, and a gap is formed between the lower portion and the piston ring, so that blow-by gas leaks and oil rises easily into the combustion chamber.

An object of the present invention is to provide a vertical multi-cylinder engine that can solve the above problems.

The configuration of the invention of claim 1 is as follows.
As shown in FIG. 1, a side water passage (3) along the longitudinal direction of the cylinder block (1) is provided on one side wall of the cylinder block (1), a cylinder jacket (4) is provided in the cylinder block (1), and a radiator is provided. In the vertical multi-cylinder engine in which the cooling water from is introduced into the cylinder jacket (4) through the side water channel (3),
An outlet (5) of the side water passage (3) to face the bottom of the cylinder jacket (4),
On one side of the cylinder block (1), the side water channel (3) is disposed together with a pair of upper and lower secondary rotary balancer shaft accommodating portions (6a) and a valve operating cam shaft (7).
The side water channel (3), a pair of upper and lower secondary rotating balancer shaft housings (6a), and a valve operating cam shaft (7) are arranged vertically along the cylinder jacket (4) and the cylinder wall (12). The pair of upper and lower secondary rotary balancer shaft housings (6a) and the valve operating cam shaft (7) are arranged separately above and below the side water channel (3),
The valve camshaft (7) is disposed below the side water channel (3), the secondary rotary balancer shaft housing (6a) is disposed above the side water channel (3),
The other secondary rotary balancer shaft accommodating portion (38a) is disposed on the other side of the cylinder block (1) opposite to the one side on which the secondary rotational balancer shaft accommodating portion (6a) is disposed. A vertical multi-cylinder engine characterized in that the secondary rotating balancer shaft accommodating portion (38a) is disposed at a position lower than the valve operating cam shaft (7) .

(Invention of Claim 1)
The invention of claim 1 has the following effects.
<Effect 1> Warm-up and cooling of the upper and lower portions of each cylinder wall are made uniform.
As shown in FIG. 1, since the outlet (5) of the side water channel (3) faces the lower part of the cylinder jacket (4), the cooling water flowing out from the outlet (5) of the side water channel (3) After passing through the lower part of 4), it floats on the upper part of the cylinder jacket (4), and warming up and cooling of the upper and lower parts of each cylinder wall (12) are made uniform. For this reason, during the warm-up operation, the lower portion of each cylinder wall (12) is warmed in the same manner as the upper portion thereof, and seizure of the piston (24) hardly occurs. In addition, during normal operation, the lower portion of each cylinder wall (12) is sufficiently cooled as well as the lower portion, and it is difficult to form a gap between the lower portion and the piston ring, so that leakage of blow-by gas occurs. Oil does not easily enter the combustion chamber.

<Effect 2> The lateral width of the engine can be reduced.
As shown in FIG. 1, a side water channel (3), a pair of upper and lower secondary rotation balancer shaft housings (6a), and a valve camshaft (7) are connected to a cylinder jacket (4) and a cylinder wall (12). Since the upper and lower pair of secondary rotating balancer shaft accommodating portions (6a) and the valve operating cam shaft (7) are arranged separately above and below the side water channel (3) , they are arranged in the width direction. Compared to the arrangement, the width of the engine can be reduced.

(Invention of Claim 2 )
In addition to the effect of the invention of claim 1 , the invention of claim 2 has the following effect.
<< Effect 3 >> The water channel resistance from the water pump to the side water channel can be reduced.
As shown in FIG. 2, the side where the water pump (10) is attached in the longitudinal direction of the cylinder block (1), and the side water channel (3 ) Is formed at the front end wall (9) of the cylinder block (1), and the inlet (11) of the side water channel (3) is opened with water. Since it faces the discharge port of the pump (10), it is possible to connect the inlet (11) of the side water channel (3) to the discharge port of the water pump (10) without bypassing the side of the timing transmission (8). The water resistance from the water pump (10) to the side water channel (3) can be reduced.

(Invention of Claim 3 )
The invention of claim 3 has the following effect in addition to the effect of the invention of claim 1 or claim 2 .
<Effect 4> Warm-up and cooling of all cylinder walls are made uniform.
As shown in FIG. 3, a plurality of outlets (5) are provided in a side water channel (3) passing through the side of all cylinder walls (12), and the plurality of outlets (5) are arranged at both ends in the longitudinal direction of the side water channel (3). Since it arrange | positions to a part and an intermediate part, a cooling water is equally distributed toward all the cylinder walls (12), and the warming-up and cooling of all the cylinder walls (12) are equalized.

(Invention of Claim 4 )
In addition to the effect of the invention of claim 3 , the invention of claim 4 has the following effect.
<Effect 5> The width of the engine can be reduced.
As shown in FIG. 3, since the tappet guide hole (14) of the valve operating device is provided in the wall (13) between the adjacent outlets (5) and (5) of the side water channel (3), the outlet (5) Compared to the case where the tappet guide holes (14) are arranged side by side in the width direction, the lateral width of the engine can be reduced.

(Invention of Claim 5 )
The invention of claim 5 has the following effect in addition to the effect of invention of claim 3 or claim 4 .
<Effect 6> Warm-up and cooling of the front and rear portions of each cylinder wall are made uniform.
As shown in FIG. 3, each outlet (5) of the side water channel (3) faces the side direction protruding end face (15) of each cylinder wall (12), so that the longitudinal direction of the cylinder block (1) is the front-rear direction. The cooling water flowing laterally from each outlet (5) of the side water channel (3) into the cylinder jacket (4) hits the side protruding end surface (15) of each cylinder wall (12) and is divided evenly back and forth. The warming and cooling of the front and rear portions of each cylinder wall (12) are made uniform.

(Invention of Claim 6 )
The invention of claim 6 has the following effects in addition to the effects of any one of claims 1 to 5 .
<Effect 7> The cooling performance of the continuous wall between the cylinder bores is high.
As shown in FIGS. 3 and 4, when adjacent cylinder walls (12) and (12) are made continuous, the inter-cylinder crossing water channel (17) along the width direction of the cylinder block (1) is connected to the continuous wall (16). Therefore, when the width direction of the cylinder block (1) is regarded as a lateral direction, the cooling water that flows laterally into the cylinder jacket (4) from the outlet (5) of the side water channel (3) ). For this reason, the cooling water smoothly passes through the inter-cylinder water passage (17), and the cooling performance of the continuous wall (16) between the cylinder bores is high.

(Invention of Claim 7 )
In addition to the effect of the invention of claim 6 , the invention of claim 7 has the following effect.
<Effect 8> Warm-up and cooling on both sides of the engine can be made uniform.
As shown in FIG. 7, the cooling water crossing the inter-cylinder crossing channel (17) is reversed and crosses the inter-port crossing channel (21), so that warming and cooling on both sides of the engine are made uniform. Can do.

(Invention of Claim 8 )
In addition to the effect of the invention of claim 7 , the invention of claim 8 has the following effect.
<Effect 9> Warm-up and cooling of the entire engine are made uniform.
As shown in FIG. 7, since the cooling water traverses the cylinder block (1) and circulates in the cylinder head (18) in all directions, the warm-up and cooling of the entire engine are made uniform.

(Invention of Claim 9 )
The invention of claim 9 has the following effect in addition to the effect of the invention of either claim 7 or claim 8 .
<Effect 10> The charging efficiency of intake air is high.
As shown in FIG. 7, the cooling water passing through the inter-port water passage (21) is directed from the intake distribution means (22) side on one side of the cylinder head (18) toward the exhaust merge means (23) side on the other side. Therefore, it is difficult for the exhaust heat to be transmitted to the intake air distribution means (22) side, and the temperature rise of the intake air can be suppressed. For this reason, the charging efficiency of intake air is high.

  Embodiments of the present invention will be described with reference to the drawings. 1 to 7 are diagrams for explaining an embodiment of the present invention. In this embodiment, a water-cooled vertical multi-cylinder diesel engine will be described.

The outline of this engine is as follows.
As shown in FIG. 2, the cylinder head (18) is assembled to the upper part of the cylinder block (1), and the head cover (35) is assembled to the upper part thereof. A water pump (10) having a cooling fan (42 ) is attached to the front end wall (9) of the cylinder block (1), and a flywheel (37) is arranged at the rear end of the cylinder block (1). . As shown in FIG. 3, a side water passage (3) is provided on the right side wall of the cylinder block (1) along the front-rear direction of the cylinder block (1), and cooling water from the radiator is supplied to the cylinder jacket through the side water passage (3). Introduced in (4).

The relationship between the water pump (10) and the side water channel (3) is as follows.
As shown in FIG. 2, the timing transmission device (8) is arranged at one end in the longitudinal direction of the cylinder block (1), and the water pump (10) is placed on the end wall (9) of the cylinder block (1) at the opposite end. As shown in FIG. 7, the inlet of the side water channel (3) at the front end of the side water channel (3) with the water pump (10) attached in the longitudinal direction of the cylinder block (1) as the front. 11), the inlet (11) of the side water channel (3) is opened by the front end wall (9) of the cylinder block (1), and the inlet (11) of the side water channel (3) is opened by the water pump (10). We faced the discharge port. As shown in FIG. 2, the timing transmission device (8) is disposed between the rear end wall (36) of the cylinder block (1) and the flywheel (37). Thus, since the timing transmission device (8) is arranged at the rear end of the cylinder block (1), the water pump (10) can be arranged without being disturbed by the timing transmission device (8) . For this reason, the position of the cooling fan (42) attached to the water pump (10) can be lowered, and it is difficult to be restricted by the model on which the engine is mounted. The timing transmission (8) is a timing gear train.

The structure of the side waterway (3) and its surroundings is as follows.
As shown in FIG. 1, on one side (right side ) of the cylinder block (1), a side water channel (3) is disposed together with a pair of upper and lower secondary rotary balancer shaft housings (6a) and a valve operating cam shaft (7). is doing.
The side water channel (3), a pair of upper and lower secondary rotating balancer shaft housings (6a), and a valve operating cam shaft (7) are arranged vertically along the cylinder jacket (4) and the cylinder wall (12). The pair of upper and lower secondary rotary balancer shaft housings (6a) and the valve operating cam shaft (7) are arranged separately above and below the side water channel (3).
The valve camshaft (7) is disposed below the side water channel (3), and the secondary rotary balancer shaft housing (6a) is disposed above the side water channel (3).
The other secondary rotation balancer shaft accommodating portion (38a) is disposed on the other side (left side) of the cylinder block (1) opposite to the one side (right side) where the secondary rotation balancer shaft (6) is disposed. The secondary rotation balancer shaft accommodating portion (38a) is arranged at a position lower than the valve operating cam shaft (7).
The left and right secondary rotation balancer shaft accommodating portions (6a) and (38a) accommodate secondary rotation balancer shafts (6) and (38), respectively.

  Further, as shown in FIG. 3, the side water channel (3) is formed over the entire length of the cylinder block (1) and passes by the side of the entire cylinder wall (12). The side water channel (3) is provided with a plurality of outlets (5), the plurality of outlets (5) are arranged at both ends and the middle part of the side water channel (3), and each outlet (3) is connected to each cylinder. It faces the side surface protruding end surface (15) of the wall (12). For this reason, the cooling water is evenly distributed toward all the cylinder walls (12), the warming up and cooling of all the cylinder walls (12) are made uniform, and from each outlet (5) of the side water channel (3). The cooling water that has flowed laterally into the cylinder jacket (4) hits the laterally projecting end face (15) of each cylinder wall (12) and is evenly divided back and forth to warm up and cool the front and rear portions of each cylinder wall (12). Is made uniform. Further, a tappet guide hole (14) of the valve operating device is provided in the wall (13) between the adjacent outlets (5) and (5) of the side water channel (3). For this reason, the lateral width of the engine can be reduced as compared with the case where the outlet (5) and the tappet guide hole (14) are arranged side by side in the width direction.

  Further, as shown in FIG. 1, the outlet (5) of the side water channel (3) faces the lower part of the cylinder jacket (4). For this reason, the cooling water flowing out from the outlet (5) of the side water channel (3) passes through the lower part of the cylinder jacket (4) and then floats up to the upper part of the cylinder jacket (4), Warm-up and cooling of the upper and lower parts are made uniform. For this reason, during the warm-up operation, the lower portion of each cylinder wall (12) is warmed in the same manner as the upper portion, and the piston (24) is unlikely to seize. In addition, during normal operation, the lower portion of each cylinder wall (12) is cooled sufficiently as well as the lower portion, and it is difficult to form a gap between the lower portion and the piston ring. And oil does not easily enter the combustion chamber.

The configuration of the cylinder jacket (4) is as follows.
As shown in FIGS. 2 to 4, in the cylinder block (1), adjacent cylinder walls (12) and (12) are made continuous. An inter-cylinder crossing water passage (17) is formed in the continuous wall (16) along the width direction of the cylinder block (1). For this reason, when the width direction of the cylinder block (1) is regarded as the lateral direction, the cooling water that has flowed laterally from the outlet (5) of the side water channel (3) into the cylinder jacket (4) is crossed between the cylinders (17). Is pushed into. For this reason, the cooling water smoothly passes through the inter-cylinder crossing water channel (17), and the cooling performance of the continuous wall (16) between the cylinder bores is high.

The configuration of the head jacket (25) is as follows.
As shown in FIGS. 5 and 6, a head jacket (25) is provided in the cylinder head (18), and the cylinder head (18) is provided between the intake port (19) and the exhaust port (20) of the cylinder head (18). The cross-port water channel (21) along the width direction of the cylinder is formed, the head intake side water channel (26) is disposed on the intake distribution means (22) side of the cylinder head (18), and the head exhaust side is disposed on the exhaust merge means (23) side. The water channel (27) is formed along the longitudinal direction of the cylinder head (18), and the head intake-side water channel (26) and the head exhaust-side water channel (27) are communicated with each other through the inter-port water channel (21). ing.

The flow of cooling water is as follows.
As shown in FIG. 7, a part of the cooling water flowing into the right side of the cylinder jacket (4) from the side water channel (3) floats to the head exhaust side water channel (27), and the remaining part is the cross cylinder water channel (17 ). An outlet (25a) of the head jacket (25) is opened on the right side surface of the right front corner (28) of the cylinder head (18). For this reason, the cooling water that has crossed the inter-cylinder crossing water channel (17) from the side water channel (3) side to the other side floats to the head intake side water channel (26), and the floating cooling water flows into the head intake side water channel ( 26) while passing forward, it is diverted to a plurality of inter-port water channels (21), and the diverted cooling water merges at the head exhaust side water channel (27) on the side water channel (3) side, and this water channel (27) is passed through. Cooling water that has passed forward and passed forward through both water channels (26) and (27) merges and flows out from the outlet (25a) of the head jacket (25). In this way, the cooling water crosses the cylinder block (1) and circulates in the cylinder head (18) in all directions, so that warm-up and cooling of the entire engine are made uniform. Further, since the cooling water passing through the inter-port water passage (21) is directed from the intake distribution means (22) side of one side of the cylinder head (18) to the exhaust merge means (23) side of the other side, the exhaust heat is sucked into the intake air. It is difficult to be transmitted to the distribution means (22) side, and the temperature rise of the intake air can be suppressed. For this reason, the charging efficiency of intake air is high. When the side water channel (3) is arranged on the left side of the cylinder block (1) and the outlet (25a) of the head jacket (25) is opened on the left side surface of the cylinder head (18), the flow of cooling water is It becomes symmetrical with the above flow.

The configuration of the head exhaust side water channel (27) is as follows.
As shown in FIGS. 6B to 6E, the ceiling wall lower surface (27a) of the head exhaust side water channel (27) is made higher than the ceiling wall lower surface (26a) of the head intake side water channel (26). For this reason, even if the engine is inclined to the left and right, the head exhaust side water channel (27) becomes higher, and an air pool is formed on the lower surface (27a) of the ceiling wall, the ceiling wall of the exhaust port (19) is exposed from the cooling water. It is difficult to secure the cooling. For this reason, the so-called left-right inclination performance of the engine is high. Moreover, since the ceiling wall lower surface (27a) of the head exhaust side water passage (27) along the longitudinal direction of the cylinder head (18) is raised, the engine is inclined forward and backward, and the front end portion of the exhaust side water passage (27) or Even if the rear end is raised and air is trapped at the front end or rear end of the lower surface (27a) of the ceiling wall, the ceiling wall of the exhaust port (19) at the front end or rear end is exposed from the cooling water. It is difficult to secure the cooling. For this reason, the so-called engine front and rear tilt performance is high.

The configuration of other water channels is as follows.
As shown in FIG. 2, the inlet water channel (10a) of the water pump (10) is formed in the wall of the front end wall (9) of the cylinder block (1). As shown in FIG. 7, a bypass water passage (29) for bypassing cooling water from the thermostat case (32) to the water pump (10), and an air vent passage for drawing air from the water pump (10) to the head jacket (25) ( 31) is formed over the wall of the front end wall (9) of the cylinder block (1) and the front end (30) of the cylinder head (18). Further, a thermostat case (32) is attached to the right side surface of the cylinder head (18), and a hot water pipe (34) for the heat exchanger (33) is connected to the thermostat case (32). For this reason, there is no possibility that these may protrude forward from the front end wall (9) of the cylinder block (1), and the cooling fan (42) can be brought close to the cylinder block (1) without being obstructed by these. The overall length of the engine can be shortened.

1 is a longitudinal front view of an engine according to an embodiment of the present invention. It is a vertical side view of the engine of FIG. FIG. 2 is a cross-sectional plan view of a cylinder block of the engine of FIG. 1, in which left and right portions having a cylinder center axis (2) as a boundary are cut at different positions. FIG. 4 is a sectional view taken along line IV-IV of the cylinder block of FIG. 3. 5A and 5B are diagrams illustrating a cylinder head of the engine of FIG. 1, in which FIG. 5A is a cross-sectional plan view, and FIG. 5B is a cross-sectional view taken along line BB of FIG. FIG. 6A is a plan view, FIG. 6B is a cross-sectional view taken along line BB of FIG. 6A, and FIG. 6C is FIG. 6A. FIG. 6D is a sectional view taken along the line DD of FIG. 6A, and FIG. 6E is a sectional view taken along the line EE of FIG. 6A. It is a model perspective view which shows the flow of the cooling water of the engine of FIG.

Explanation of symbols

(1) Cylinder block, (3) Side water channel, (4) Cylinder jacket, (5) Side water channel outlet, (6a) Secondary housing for balancer shaft, (7) Valve cam Shaft, (8) Time transmission, (9) Cylinder block end wall, (10) Water pump, (11) Side water channel inlet, (12) Cylinder wall, (13) Meat wall, (14) ... Tappet guide hole, (15) Side projecting end surface, (16) ... Continuous wall, (17) ... Cross water passage between cylinders, (18) ... Cylinder head, (19) ... Intake port, (20) Exhaust port, (21) Cross-channel between ports, (22) Intake distribution means, (23) Exhaust merge means, (25) Head jacket, (25a) Head jacket outlet, (26) Head Intake side water passage, (27) Head exhaust side water passage, (28) Front corner of cylinder head, (38a) Secondary rotary balancer shaft accommodating portion .

Claims (9)

A side water passage (3) along the longitudinal direction of the cylinder block (1) is provided on one side wall of the cylinder block (1), a cylinder jacket (4) is provided in the cylinder block (1), and cooling water from the radiator is supplied to the side water passage. In the vertical multi-cylinder engine introduced into the cylinder jacket (4) via (3),
Let the exit (5) of the side waterway (3) face the bottom of the cylinder jacket (4)
On one side of the cylinder block (1), the side water channel (3) is disposed together with a pair of upper and lower secondary rotary balancer shaft accommodating portions (6a) and a valve operating cam shaft (7).
The side water channel (3), a pair of upper and lower secondary rotating balancer shaft housings (6a), and a valve operating cam shaft (7) are arranged vertically along the cylinder jacket (4) and the cylinder wall (12). The pair of upper and lower secondary rotary balancer shaft housings (6a) and the valve operating cam shaft (7) are arranged separately above and below the side water channel (3),
The valve camshaft (7) is disposed below the side water channel (3), the secondary rotary balancer shaft housing (6a) is disposed above the side water channel (3),
The other secondary rotary balancer shaft accommodating portion (38a) is disposed on the other side of the cylinder block (1) opposite to the one side on which the secondary rotational balancer shaft accommodating portion (6a) is disposed. A vertical multi-cylinder engine characterized in that the secondary rotating balancer shaft accommodating portion (38a) is disposed at a position lower than the valve operating cam shaft (7) . The vertical multi-cylinder engine according to claim 1 ,
The timing transmission device (8) is disposed at one end in the longitudinal direction of the cylinder block (1), and a water pump (10) is attached to the end wall (9) of the cylinder block (1) at the opposite end.
An inlet (11) of the side water channel (3) is formed at the front end of the side water channel (3) with the water pump (10) attached in the longitudinal direction of the cylinder block (1), and this side water channel ( 3) The inlet (11) of the cylinder block (1) is opened at the front end wall (9), and the inlet (11) of the side water channel (3) faces the discharge port of the water pump (10). Characteristic vertical multi-cylinder engine . The vertical multi-cylinder engine according to claim 1 or 2 ,
A plurality of outlets (5) are provided in the side water channel (3) that passes by the side of all cylinder walls (12), and the plurality of outlets (5) are arranged at both ends in the longitudinal direction of the side water channel (3) and in the middle part. A vertical multi-cylinder engine characterized by that. The vertical multi-cylinder engine according to claim 3 ,
A vertical multi-cylinder engine characterized in that a tappet guide hole (14) of a valve operating device is provided in a wall (13) between adjacent outlets (5) and (5) of a side waterway (3) . The vertical multi-cylinder engine according to any one of claims 3 and 4 ,
A vertical multi-cylinder engine characterized in that each outlet (5) of the side water channel (3) faces the side direction protruding end face (15) of each cylinder wall (12). The vertical multi-cylinder engine according to any one of claims 1 to 5 ,
When the adjacent cylinder walls (12) (12) are made continuous,
A vertical multi-cylinder engine characterized in that a continuous water passage (17) between cylinders along the width direction of the cylinder block (1) is formed on the continuous wall (16). The vertical multi-cylinder engine according to claim 6 ,
A head jacket (25) is provided in the cylinder head (18), and a port-to-port water channel (in the width direction of the cylinder head (18)) between the intake port (19) and the exhaust port (20) of the cylinder head (18). 21)
A vertical multi-cylinder engine characterized in that the cooling water crossing the inter-cylinder crossing water channel (17) is reversed and crosses the inter-port crossing water channel (21). The vertical multi-cylinder engine according to claim 7 ,
In the longitudinal direction of the cylinder head (18), the head intake side water passage (26) is disposed on the intake distribution means (22) side of the cylinder head (18), the head exhaust side water passage (27) is disposed on the exhaust confluence means (23) side. The head intake side water channel (26) and the head exhaust side water channel (27) are communicated with each other through a port-to-port water channel (21).
When the longitudinal direction of the cylinder head (18) is the front-rear direction and one of them is the front, the front corner angle of the cylinder head (18) on the side where the side water channel (3) is located on both sides in the width direction of the cylinder head (18) Open the outlet (25a) of the head jacket (25) in the part (28),
The cooling water crossing the inter-cylinder crossing water channel (17) from the side water channel (3) side toward the other side is the side water channel (3) of the head intake side water channel (26) and the head exhaust side water channel (27). Ascending to the water channel (26) on the opposite side, the rising cooling water passes forward through this water channel (26), and is divided into a plurality of inter-port water channels (21), and the divided cooling water is on the side water channel (3) side. The cooling water that has passed through the water channel (27) forward and passed through the water channels (26) and (27) joined together through the outlet (25a) of the head jacket (25). A vertical multi-cylinder engine characterized by flowing out. The vertical multi-cylinder engine according to any one of claims 7 and 8 ,
The coolant crossing the inter-port water passage (21) is directed from the intake distribution means (22) side of one side of the cylinder head (18) to the exhaust merge means (23) side of the other side. Vertical multi-cylinder engine .

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