JP7205095B2 - Mounting structure of tensioner unit for vehicle internal combustion engine - Google Patents

Description

The present invention relates to a mounting structure for a tensioner unit of a vehicle internal combustion engine.

Vehicles such as automobiles are equipped with accessories to which power is transmitted from a crankshaft via an accessory drive belt, and the accessory drive belt is given a constant tension by a tensioner unit.

As a tensioner unit mounting structure, a tensioner unit for an accessory drive belt disclosed in Patent Document 1 is known. The tensioner unit includes a pulley arm swingably supported by the engine block, a rotatable tension pulley supported at an eccentric position with respect to the swing center of the pulley arm, and one end connected to the pulley arm, with the connecting portion being the center. It is equipped with a hydraulic auto tensioner that can swing as

JP 2016-156430 A

By the way, a chain case for covering the timing chain is attached to the engine block on the accessory drive belt side, and the tensioner unit is attached to the chain case.

In this case, since the tensioner unit receives tension from the accessory drive belt, the chain case to which the pulley arm is attached must have sufficient strength.

However, since the chain case is formed thin, it is difficult to ensure sufficient strength for attaching the tensioner unit, and there is a risk that the tensioner unit will vibrate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a tensioner unit for a vehicle internal combustion engine that can increase the mounting strength of the tensioner unit and reduce the vibration input from the tensioner unit to the cover member. The object is to provide a mounting structure.

The present invention comprises a first side, a second side located opposite the first side, and a second side provided on the second side extending outwardly from the second side. a projecting upper protrusion; a lower protrusion provided on the second side and positioned below the upper protrusion and protruding outward from the second side; an engine body having a third side portion connecting an end portion in the direction in which the portion extends and an end portion in the direction in which the second side portion extends; and the third side portion on the side of the first side portion. a cover member having one side edge that is fastened to the second side portion and the other side edge that is fastened to the third side portion on the second side portion side, the cover member covering the third side portion; a first auxiliary device installed on a side portion side and to which power is transmitted from the engine body via a first drive belt ; A tensioner for adjusting the tension of the first drive belt in a vehicle internal combustion engine equipped with a belt or a second accessory to which power is transmitted via a second drive belt different from the first drive belt. A tensioner unit mounting structure for a vehicle internal combustion engine having a tensioner unit mounted thereon, wherein the tensioner unit has a first mounting portion and a second mounting portion mounted to the cover member, and the first The mounting portion is installed between the upper protruding portion and the lower protruding portion in the height direction of the vehicle internal combustion engine.

As described above, according to the present invention, the mounting strength of the tensioner unit can be increased, and vibration input from the tensioner unit to the cover member can be reduced.
movement can be restrained.

FIG. 1 is a plan view of the front portion of a vehicle equipped with a vehicle internal combustion engine according to one embodiment of the present invention. FIG. 2 is a right side view of the vehicle internal combustion engine according to one embodiment of the present invention. FIG. 3 is a rear view of the vehicle internal combustion engine according to one embodiment of the present invention. FIG. 4 is a rear view of the vehicle internal combustion engine according to one embodiment of the present invention, showing a state in which the water pump is removed. 5 is a cross-sectional view taken along the line VV in FIG. 2. FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 2. FIG. FIG. 7 is a right side view of the vehicle internal combustion engine according to one embodiment of the present invention, showing the direction in which the load is applied from the tensioner unit to the chain cover.

A mounting structure for a tensioner unit for a vehicle internal combustion engine according to an embodiment of the present invention includes a first side portion, a second side portion opposite to the first side portion, and a second side portion. and an upper protrusion provided on the second side and protruding outward from the second side, and an upper protrusion provided on the second side and positioned below the upper protrusion and protruding outward from the second side. an engine body having a lower projecting portion and a third side portion connecting an end portion in an extending direction of the first side portion and an end portion in the extending direction of the second side portion; and the first side portion. a cover member that covers the third side and has one side edge that is fastened to the third side on the side and the other side edge that is fastened to the third side on the second side; A first auxiliary machine installed on the first side and to which power is transmitted from the engine body via a drive belt, and attached to the upper protrusion and the lower protrusion, and power is transmitted via the drive belt. a tensioner unit mounting structure for adjusting the tension of a drive belt, the tensioner unit having a mounting portion mounted on a cover member; The mounting portion is installed between the upper projecting portion and the lower projecting portion in the height direction of the vehicle internal combustion engine.

As a result, the mounting strength of the tensioner unit can be increased, and vibration input from the tensioner unit to the cover member can be reduced.

Hereinafter, an embodiment of a mounting structure of a tensioner unit for a vehicle internal combustion engine according to the present invention will be described with reference to the drawings.
1 to 7 are diagrams showing a mounting structure of a tensioner unit for a vehicle internal combustion engine according to one embodiment of the present invention. 1 to 7, the vertical, front, rear, left, and right directions are the width direction of the vehicle, and the height direction of the vehicle, when the direction in which the vehicle travels is the front, and the direction in which the vehicle moves backward is the rear.

First, the configuration will be explained.
In FIG. 1, a vehicle 1 has a vehicle body 2, and the vehicle body 2 is partitioned by a dash panel 3 into an engine room 4 and a vehicle room 5 located behind the engine room 4 and in which a passenger appears. ing.

A powertrain 6 is installed in the engine room 4, and the powertrain 6 is elastically supported on the vehicle body 2 by a mounting device (not shown).

The power train 6 includes an engine 7 as a vehicle internal combustion engine and a transmission 8. The engine 7 and the transmission 8 are arranged side by side in the vehicle width direction (horizontal direction). The engine 7 converts thermal energy into mechanical energy, and the transmission 8 changes the rotation speed of the engine 7 and outputs it.

In FIG. 3, the engine 7 has an engine body 9, and the engine body 9 has a cylinder block 11, a cylinder head 12, a cylinder head cover 13 and an oil pan .

In FIG. 5, the cylinder block 11 is provided with a plurality of cylinders 11s. The cylinders 11s are arranged in a row in the vehicle width direction. A piston (not shown) is accommodated in the cylinder 11s, and the piston reciprocates vertically with respect to the cylinder 11s.

The piston is connected to a crankshaft 15 (see FIG. 2) via a connecting rod (not shown), and reciprocating motion of the piston is converted into rotational motion of the crankshaft 15 via the connecting rod.

The crankshaft 15 extends in the same direction as the direction in which the cylinders 11s are arranged, and the engine 7 is a transverse engine.

As shown in FIG. 6, the cylinder head 12 has a plurality of intake ports 12A, a plurality of intake valves (not shown) for opening and closing the intake ports 12A, a plurality of exhaust ports 12B, and a plurality of valves (not shown) for opening and closing the exhaust ports 12B. An exhaust valve is provided.

The intake port 12A introduces air into the cylinder 11s, and the exhaust port 12B discharges exhaust gas combusted in the cylinder 11s from the cylinder 11s. The engine 7 of this embodiment is composed of a four-cylinder engine. Note that the number of cylinders is not limited to four.

A valve gear chamber (not shown) is formed between the cylinder head 12 and the cylinder head cover 13, and the valve gear chamber accommodates an exhaust camshaft and an intake camshaft (not shown). The timing chain connects the crankshaft 15 with the intake camshaft and the exhaust camshaft, and the power of the crankshaft 15 is transmitted to the intake camshaft and the exhaust camshaft via the timing chain.

The oil pan 14 stores oil for lubricating the crankshaft 15, the pistons, and the like.

2, 5, and 6, a motor generator 16 is installed on the front side portion 11a of the cylinder block 11 and the front side portion 12a of the cylinder head 12, and the motor generator 16 is fastened to the cylinder head 12 with bolts 18A. , and bolts 18B to the cylinder block 11 (see FIG. 2).

The front side portion 11a of the cylinder block 11 and the front side portion 12a of the cylinder head 12 constitute the first side portion of the engine body of the present invention.

2, an upper projecting portion 11A and a lower projecting portion 11B are provided on a rear portion 11b (see FIG. 4) of the cylinder block 11 located opposite to the front portion 11a of the cylinder block 11 and the front portion 12a of the cylinder head 12 (see FIG. 4). and are provided.

The upper protruding portion 11A protrudes outward from the rear side portion 11b of the cylinder block 11, that is, in a direction away from the front side portion 11a of the cylinder block 11. As shown in FIG. The upper surface 11u of the upper projecting portion 11A is positioned on the extension line L of the joint surface 9M (see FIG. 2) between the cylinder block 11 and the cylinder head 12. As shown in FIG.

The lower protruding portion 11B is positioned below the upper protruding portion 11A and protrudes outward from the rear side portion 11b of the cylinder block 11, that is, in a direction away from the front side portion 11a of the cylinder block 11. As shown in FIG. The rear side portion 11b of the cylinder block 11 and the rear side portion 12b of the cylinder head 12 constitute the second side portion of the engine body of the present invention.

A water pump 17 is installed on the rear side portion 11 b of the cylinder block 11 and the rear side portion 12 b of the cylinder head 12 . In FIG. 3, the water pump 17 is fastened to the upper projecting portion 11A by bolts 18C, and is fastened to the lower projecting portion 11B by bolts 18D. Further, the water pump 17 is fastened to the rear side portion 11b of the cylinder block 11 with bolts 18E.

As shown in FIG. 2, a compressor 20 is installed on the front side portion 11a of the cylinder block 11 below the motor generator 16, and the compressor 20 is fastened to the cylinder block 11 with bolts (not shown).

5 and 6, the right side portion 11c of the cylinder block 11 and the right side portion 12c of the cylinder head 12 are the right ends 11r and 12r in the direction in which the front side portions 11a and 12a of the cylinder block 11 and the cylinder head 12 extend. It communicates with the right end portions 11m and 12m in the extending direction of the rear side portions 11b and 12b.

The right side portion 11c of the cylinder block 11 and the right side portion 12c of the cylinder head 12 constitute the third side portion of the cylinder head 12 of the present invention. The right ends 11r and 12r of the front side portions 11a and 12a in the direction in which they extend constitute the ends in the direction in which the first side portion extends in the present invention, and the right ends 11m and 12m of the rear side portions 11b and 12b are: It constitutes the end in the extending direction of the second side of the present invention.

In FIG. 3, a chain cover 21 is attached to the right side portions 11c and 12c of the cylinder block 11 and the cylinder head 12. As shown in FIG. In FIG. 2, the chain cover 21 has one side edge 21A fastened by bolts 18F to the right side portions 11c and 12c on the side of the front side portions 11a and 12a, and bolts 18G to the right side portions 11c and 12c on the side of the rear side portions 11b and 12b. It has the other side edge 21B fastened by. The chain cover 21 of this embodiment constitutes the cover member of the present invention.

A crank pulley 15a is provided at the end of the crankshaft 15 on the right side of the chain cover 21 (on the near side in the paper surface direction of FIG. 2). The motor generator 16 is provided with a generator pulley 16 a , and the generator pulley 16 a is connected to a rotating shaft 16 b of the motor generator 16 .

The water pump 17 is provided with a pump pulley 17 a , and the pump pulley 17 a is connected to a rotating shaft 17 b of the water pump 17 . The motor generator 16 of this embodiment constitutes the first auxiliary machine of the invention, and the water pump 17 constitutes the second auxiliary machine of the invention.

The compressor 20 is provided with a compressor pulley 20 a , and the compressor pulley 20 a is connected to a rotating shaft 20 b of the compressor 20 .

A drive belt 41A is wound around the crank pulley 15a, the generator pulley 16a and the compressor pulley 20a. Power of the crankshaft 15 is transmitted from the crank pulley 15a to the generator pulley 16a and the pump pulley 17a via the drive belt 41A. As a result, the motor generator 16 generates power and the compressor 20 is driven.

A drive belt 41B is wound around the crank pulley 15a and the pump pulley 17a. Power of the crankshaft 15 is transmitted from the crank pulley 15a to the pump pulley 17a via the drive belt 41B. This drives the pump pulley 17a.

The crank pulley 15a is divided in the longitudinal direction with respect to the axial direction (vehicle width direction) of the crankshaft 15, and the drive belt 41A and the drive belt 41B are respectively wound around the divided crank pulleys 15a. . That is, the drive belt 41A and the drive belt 41B are installed to be offset in the axial direction of the crankshaft 15 .

Thus, in the engine 7 of the present embodiment, power is transmitted from the engine body 9 to the motor generator 16 and the compressor 20 via the drive belt 41A, and power is transmitted to the water pump 17 via the drive belt 41B.

A tension roller 42A is attached to the motor generator 16 . The tension roller 42A is rotatably provided on the bracket 42B. Bracket 42B is fixed to motor generator 16 with bolts 18H.

The drive belt 41A is formed longer than the drive belt 41B, and the tension roller 42A applies tension to the drive belt 41A by contacting the drive belt 41A and pressing the drive belt 41A.

A tensioner unit 43 is provided on the chain cover 21 . The tensioner unit 43 has a bracket 44 , arm members 45 and tension rollers 46 .

The bracket 44 is fastened to the chain cover 21 with bolts 18J and 18K. A connecting portion 44A is provided on the bracket 44 (see FIG. 5), and one end portion 45a of the arm member 45 is rotatably connected to the connecting portion 44A. This allows the arm member 45 to swing about the connecting portion 44A.

A tension roller 46 is rotatably connected to the other end 45b of the arm member 45, and the tension roller 46 is in contact with the driving belt 41A.

A connection portion 44A of the bracket 44 and one end portion 45a of the arm member 45 are connected by a torsion spring 47 (see FIG. 5). The torsion spring 47 biases the arm member 45 in one direction so that the tension roller 46 presses the drive belt 41A. As a result, tension is applied to the drive belt 41A by the tensioner unit 43. As shown in FIG.

In the tensioner unit 43, when a reaction force is applied from the drive belt 41A, the arm member 45 swings in the other direction against the biasing force of the torsion spring 47, and the drive belt 41A fluctuates due to the torque fluctuation of the engine 7. Absorb tension fluctuations.

In this manner, the tensioner unit 43 swings the arm member 45 in one direction and the other direction by the spring force of the torsion spring 47, so that the tension roller 46 presses the drive belt 41A, or the drive belt 41A is stretched. The tension of the drive belt 41A is adjusted by receiving the reaction force.

In FIG. 2, the bracket 44 has mounting portions 44B and 44C. The mounting portion 44B is installed between the upper protruding portion 11A and the lower protruding portion 11B and on the other side edge 21B of the chain cover 21 in the vertical direction, that is, in the height direction of the engine 7, and is attached to the bolt 18J. is fastened to the other side edge 21B by

A bulging portion 29 is provided on the chain cover 21 above the tensioner unit 43 . The bulging portion 29 bulges from the chain cover 21 toward the side opposite to the right side portions 11c and 12c of the engine body 9 (see FIG. 1).

The mounting portion 44C is installed above the mounting portion 44B and on the one side edge 21A side of the engine body 9 with respect to the mounting portion 44B, and is fastened to the bulging portion 29 with a bolt 18K. The mounting portion 44B of this embodiment constitutes the first mounting portion of the present invention, and the mounting portion 44C constitutes the second mounting portion of the present invention.

5 and 6, the water pump 17 has a water pump body portion 17A and a cooling water passage portion 17B. The water pump body portion 17A includes a rotor (not shown) and the like, and sends cooling water sent from a radiator (not shown) to the cooling water passage portion 17B. The cooling water passage portion 17B sends the cooling water sent from the water pump main body portion 17A to the engine main body 9. As shown in FIG.

A cooling water passage portion 11W is provided in the rear side portion 11b of the cylinder block 11 . In FIG. 5, the cooling water passage portion 11W includes a cooling water passage 11w, and the cooling water passage 11w communicates with the water jacket 11j.

The cooling water passage portion 17B is fastened to the cooling water passage portion 11W by bolts 18E (see FIG. 1), and the cooling water passage 17w formed inside the cooling water passage portion 17B communicates with the cooling water passage 11w. ing. The low-temperature cooling water cooled by the radiator is introduced into the cooling water passage 17w by the water pump body portion 17A, and then introduced into the water jacket 11j from the cooling water passage portion 11w.

The water jacket 11 j is installed around the cylinder 11 s of the cylinder block 11 . Thereby, the cylinder 11s is cooled by the cooling water introduced into the water jacket 11j.

FIG. 5 shows the cooling water W flowing through the water jacket 11j through the water pump 17 and the cooling water passage 11w. Although the cooling water W flows through the water jacket 11j, FIG. 5 shows the direction in which the cooling water W flows outside the cylinder 11s.

A water jacket (not shown) is installed around the joint surface 9M between the cylinder block 11 and the cylinder head 12 where the combustion chamber is formed. Cooling water introduced into the cylinder block 11 from the cooling water passage 11w is introduced into a water jacket installed around the joint surface 9M, and the circumference of the joint surface 9M is cooled.

The cooling water passage portion 17B of this embodiment constitutes the accessory side cooling water passage portion of the present invention, and the cooling water passage portion 11W constitutes the block side cooling water passage portion of the present invention.

In FIG. 4, the cooling water passage portion 11W is provided at the same height position as the upper protruding portion 11A, and is installed on the side opposite to the chain cover 21 with respect to the upper protruding portion 11A.

In FIG. 5, the cooling water passage portion 17B is located on the side opposite to the tensioner unit 43 with respect to the water pump body portion 17A in the arrangement direction of the cylinders 11s, ie, in the vehicle width direction. In addition, the cooling water passage portion 17B extends from the water pump main body portion 17A so as to be further away from the upper projecting portion 11A in the direction in which the cylinders 11s are arranged, and is connected to the cooling water passage portion 11W.

The bolt 18J fastens the mounting portion 44B to the cooling water passage portion 11W through the chain cover 21. As shown in FIG. The bolt 18J of this embodiment constitutes the fastener of the present invention.
In FIG. 4, a mount attaching portion 22 is provided on the upper portion of the chain cover 21 . The mount attachment portion 22 protrudes from the chain cover 21 toward the side opposite to the right side portions 11c and 12c of the engine body 9 (see FIG. 1).

A mount member (not shown) is provided on the mount attachment portion 22 , and the mount member is installed on the vehicle body 2 side. The engine 7 is elastically supported by the vehicle body 2 via mount members.

Next, the action will be explained.
As shown in FIG. 7, the drive belt 41A extends obliquely downward from the generator pulley 16a toward the crank pulley 15a, and the tension roller 46 extends between the generator pulley 16a and the crank pulley 15a. It is in contact with the drive belt 41A near the center of the direction. As a result, the drive belt 41A is bent toward the compressor 20 side.

As a result, a load F1 is applied to the tensioner unit 43 from the driving belt 41A obliquely upward to the rear. Further, the force component F2 of the load F1 is applied to the tensioner unit 43 in the vertical direction, and the force component F3 of the load F1 is applied in the horizontal direction. At this time, a vertical load F4 and a horizontal load F5 are applied to the mounting portion 44B, and the chain cover 21 vibrates vertically and horizontally.

The engine 7 of this embodiment includes an upper protruding portion 11A protruding outward from the rear side portion 11b of the cylinder block 11, and a lower protruding portion 11A located below the upper protruding portion 11A and protruding outward from the rear side portion 11b. and a chain cover 21 covering the right side portions 11c and 12c of the engine body 9. As shown in FIG.

Further, the engine 7 is installed on the front side portion 11a side of the cylinder block 11, and is attached to a motor generator 16 to which power is transmitted from the engine body 9 via a drive belt 41A, and to the upper protrusion portion 11A and the lower protrusion portion 11B. and a water pump 17 to which power is transmitted from the engine body 9 via a drive belt 41B.

In addition to this, the engine 7 includes a tensioner unit 43 that adjusts the tension of the drive belt 41A. The tensioner unit 43 has attachment portions 44B and 44C attached to the chain cover 21, and the attachment portion 44B It is installed between the upper projecting portion 11A and the lower projecting portion 11B in the height direction of the engine 7 .

The upper protruding portion 11A and the lower protruding portion 11B, to which the water pump 17 having high rigidity is connected, are reinforced by the water pump 17 and thus have high rigidity. A portion of the chain cover 21 between the highly rigid upper projecting portion 11A and the lower projecting portion 11B has high rigidity and is difficult to deform.

Therefore, by attaching the mounting portion 44B of the tensioner unit 43 to the highly rigid portion of the chain cover 21 between the upper protruding portion 11A and the lower protruding portion 11B, the mounting strength of the chain cover 21 to which the mounting portion 44B is mounted can be increased. The load F4, F5 input from the mounting portion 44B can be received by the chain cover 21 having sufficient strength.

Therefore, the vibrations input from the tensioner unit 43 to the chain cover 21 can be reduced, and the tension of the drive belt 41A can be stably adjusted by the tensioner unit 43.

Further, according to the engine 7 of this embodiment, the water pump 17 has the water pump main body portion 17A and the cooling water passage portion 17B for sending the cooling water from the water pump main body portion 17A to the cylinder block 11 .

The cooling water passage portion 17B is located on the side opposite to the tensioner unit 43 with respect to the water pump main body portion 17A in the direction in which the cylinders 11s are arranged, and is located in the direction in which the cylinders 11s are arranged from the water pump main body portion 17A to the upper projecting portion 11A. , and connected to the rear side portion 11b of the cylinder block 11. As shown in FIG.

As a result, the upper protruding portion 11A can be reinforced by the highly rigid cooling water passage portion 17B, and the rigidity of the upper protruding portion 11A in the arrangement direction of the cylinders 11s can be increased. Therefore, the rigidity of the portion of the chain cover 21 between the upper protruding portion 11A and the lower protruding portion 11B having higher rigidity can be further increased.

As a result, when a load F5 is applied to the mounting portion 44B and a bending moment M is applied to the water pump 17, which is a heavy object, to the rear from the mounting portion 44B as a starting point (see FIG. 5), this bending moment M can be received by the chain cover 21 having sufficient strength. Therefore, it is possible to more effectively reduce the vibrations that are input from the tensioner unit 43 to the chain cover 21 .

Further, according to the engine 7 of this embodiment, the engine body 9 has the cooling water passage portion 11W to which the cooling water passage portion 17B is connected, and the upper projecting portion 11A is connected to the cooling water passage portion 11W. there is

The cooling water passage portion 11W has a cooling water passage 11w formed therein and has a thickness in the direction in which the cylinders 11s are arranged, so that the rigidity is high. By connecting the highly rigid cooling water passage portion 11W to the highly rigid cooling water passage portion 17B, the upper projecting portion 11A can be further reinforced by the highly rigid cooling water passage portion 11W and the cooling water passage portion 17B.

Therefore, the rigidity of the upper protrusion 11A in the direction in which the cylinders 11s are arranged can be further increased, and the rigidity of the portion of the chain cover 21 between the upper protrusion 11A and the lower protrusion 11B having higher rigidity can be further increased. can.

As a result, the loads F4 and F5 input from the mounting portion 44B can be received by the chain cover 21 having sufficient strength, and vibration input from the tensioner unit 43 to the chain cover 21 can be reduced more effectively.

Furthermore, when the water pump 17, which is a heavy object, is subjected to a rearward bending moment M starting from the mounting portion 44B, the cooling water passage portion 11W having high rigidity provided in the direction in which the bending moment M is applied and the cooling water The bending moment M can be received by the passage portion 17B. Therefore, it is possible to more effectively reduce the vibrations that are input from the tensioner unit 43 to the chain cover 21 .

Further, according to the engine 7 of the present embodiment, the tensioner unit 43 has the bolt 18J that fastens the mounting portion 44B to the cylinder block 11 through the chain cover 21, and the mounting portion 44B is formed by the bolt 18J to form the cooling water passage. It is fastened to the portion 11W.

Therefore, the mounting portion 44B can be connected to the highly rigid cooling water passage portion 11W by the bolt 18J, and the loads F4 and F5 input from the mounting portion 44B can be transferred to the highly rigid upper projecting portion 11A and the lower projecting portion. It can be received by both the portion of the chain cover 21 between 11B and the highly rigid cooling water passage portion 11W. As a result, the vibration input from the tensioner unit 43 to the chain cover 21 can be reduced more effectively.

Further, according to the engine 7 of the present embodiment, the chain cover 21 has the bulging portion 29 that bulges from the chain cover 21 to the side opposite to the right side portions 11c and 12c of the engine body 9, and the tensioner unit 43 is: It has an attachment portion 44C attached to the bulging portion.

The mounting portion 44B is installed on the other side edge 21B of the chain cover 21, and the mounting portion 44C is installed on the one side edge 21A side of the chain cover 21 with respect to the mounting portion 44B.

Thus, the mounting portion 44B is installed on the other side edge 21B of the chain cover 21, and the mounting portion 44C is mounted on the bulging portion 29 on the one side edge 21A side of the chain cover 21 with respect to the mounting portion 44B. , the tensioner unit 43 can be stably attached to the chain cover 21 as compared with the case where the attachment portion 44B and the attachment portion 44C are installed close to each other.

Further, the other side edge 21B of the chain cover 21, which is fastened to the right side of the engine body 9 with the bolt 18G, has high rigidity. By installing the mounting portion 44B on the other side edge 21B, the loads F4 and F5 input from the mounting portion 44B can be received by the chain cover 21 having sufficient strength.

In addition, the bulging portion 29 has high rigidity. By installing the mounting portion 44C on the bulging portion 29, the load input from the mounting portion 44C can be received by the chain cover 21 having sufficient strength. As a result, the vibration input from the tensioner unit 43 to the chain cover 21 can be reduced more effectively.

Further, according to the engine 7 of this embodiment, the upper surface 11u of the upper projecting portion 11A is located on the extension line L of the joint surface 9M between the cylinder block 11 and the cylinder head 12. As shown in FIG.

A joint surface 9M between the cylinder block 11 and the cylinder head 12 has high rigidity. By installing the upper protruding portion 11A near the joint surface 9M having high rigidity, the rigidity of the upper protruding portion 11A can be further increased.

Therefore, the rigidity of the portion of the chain cover 21 between the highly rigid upper protruding portion 11A and the lower protruding portion 11B can be further increased. Mounting strength can be further increased. Therefore, the loads F4 and F5 input from the attachment portion 44B can be received by the chain cover 21 having sufficient strength.

The engine 7 of this embodiment transmits power from the crank pulley 15a to the motor generator 16, the water pump 17 and the compressor 20 by means of two drive belts 41A and 41B. Power may be transmitted to motor generator 16, water pump 17 and compressor 20 by three drive belts.

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

7... Engine (vehicle internal combustion engine), 9... Engine body, 9M... Joint surface (joint surface between cylinder block and cylinder head), 11... Cylinder block, 11A... Upper protrusion , 11B...lower projecting portion, 11C...cooling water passage portion (block side cooling water passage portion), 11a, 12a... front side portion (first side portion), 11b, 12b... rear side (second side), 11m, 12m... right end (end in the direction in which the second side extends), 11r, 12r... right end (in the direction in which the first side extends) end), 11s... cylinder, 11u... upper surface (upper surface of upper protrusion), 12... cylinder head, 16... motor generator (first auxiliary machine), 17... water pump (Second accessory), 17A... Water pump body, 17B... Cooling water passage, 18J... Bolt (fastener), 21... Chain cover (cover member), 21A.. One side edge, 21B... other side edge, 29... expanded portion, 41A, 41B... drive belt, 43... tensioner unit, 44B... mounting portion (first mounting portion) , 44C... Mounting portion (second mounting portion), L... Extension of joint surface between cylinder block and cylinder head

Claims (6)

A first side portion, a second side portion located opposite to the first side portion, and an upper protrusion provided on the second side portion and protruding outward from the second side portion. a lower protruding portion provided on the second side portion and positioned below the upper protruding portion and protruding outward from the second side portion; and a direction in which the first side portion extends. an engine body having a third side portion connecting the end portion of the second side portion with the end portion in the extending direction of the second side portion;
having one side edge fastened to the third side portion on the first side portion side and the other side edge fastened to the third side portion on the second side portion side; a cover member covering the side of 3;
a first auxiliary machine installed on the first side and to which power is transmitted from the engine body via a first drive belt;
a second auxiliary machine attached to the upper protrusion and the lower protrusion and to which power is transmitted via the first drive belt or a second drive belt different from the first drive belt; A tensioner unit mounting structure for a vehicle internal combustion engine, wherein a tensioner unit for adjusting the tension of the first drive belt is attached to the vehicle internal combustion engine,
The tensioner unit has a first mounting portion and a second mounting portion that are mounted on the cover member, and the first mounting portion is positioned between the upper protruding portion and the upper protruding portion in the height direction of the vehicle internal combustion engine. A mounting structure for a tensioner unit of a vehicle internal combustion engine, wherein the tensioner unit is installed between the lower protrusions. The engine body has a plurality of cylinders arranged in a row,
the second auxiliary machine comprises a water pump,
The water pump has a water pump main body and an accessory-side cooling water passage for sending cooling water from the water pump main body to the engine main body,
The accessory-side cooling water passage portion is located on the side opposite to the tensioner unit with respect to the water pump body portion in the arrangement direction of the cylinders, and is located further from the water pump body portion than the upper projecting portion to the cylinders. 2. The mounting structure of a tensioner unit for an internal combustion engine for a vehicle according to claim 1, wherein the tensioner unit is connected to the second side portion of the engine body by extending away from each other in the arrangement direction. The engine body has a block-side cooling water passage to which the accessory-side cooling water passage is connected, and the accessory-side cooling water passage is connected to the block-side cooling water passage. 3. The mounting structure of a tensioner unit for a vehicle internal combustion engine according to claim 2. The tensioner unit has a fastener that fastens the first mounting portion to the engine body via the cover member, and the first mounting portion is connected to the block-side cooling water passage portion by the fastener. 4. The mounting structure of a tensioner unit for a vehicle internal combustion engine according to claim 3, wherein the tensioner unit is fastened. the cover member has a bulging portion that bulges from the cover member to the side opposite to the third side;
The second attachment portion is attached to the bulging portion,
The first mounting portion is installed on the other side edge of the cover member,
A said 2nd attachment part is installed in the said one side edge side of the said cover member with respect to a said 1st attachment part, Claim 1 characterized by the above-mentioned. mounting structure of a tensioner unit of an internal combustion engine for a vehicle. The engine body has a cylinder block having the second side, and a cylinder head attached to an upper portion of the cylinder block and having the second side,
The upper protrusion and the lower protrusion protrude outward from the second side of the cylinder block,
6. The vehicle internal combustion engine according to any one of claims 1 to 5, wherein an upper surface of said upper projecting portion is positioned on an extension of a joint surface between said cylinder block and said cylinder head. Mounting structure of the tensioner unit.

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