JP7658215B2 - Mounting structure for cover member of internal combustion engine - Google Patents

Description

The present invention relates to a mounting structure for a cover member of an internal combustion engine.

An engine chain cover structure that connects the engine chain cover to the cylinder head and cylinder block is known (see Patent Document 1).

In this engine chain cover structure, the chain cover is provided with a boss-shaped (cylindrical) first fastening portion, which is located at the top of the chain cover and in the center in the width direction.

The chain cover is fixed to the cylinder head by fastening the first fastening portion to the cylinder head with a bolt.

JP 2021-63490 A

In the engine chain cover structure described in Patent Document 1, the first fastening part is fastened to the cylinder head by a bolt, but unless the fastening part on the cylinder head side is designed to be less susceptible to vibration, there is a risk that the vibration of the cover member will increase, and there is still room for improvement.

The present invention was made in response to the above-mentioned problems, and aims to provide a mounting structure for an internal combustion engine cover member that can increase the rigidity of the part of the internal combustion engine body to which the cover member is fastened and suppress vibration of the cover member.

The present invention relates to an internal combustion engine body having one side wall and another side wall located opposite to the one side wall in the axial direction of the crankshaft, and rotatably supporting the crankshaft and a camshaft; a first oil supply pipe section and a second oil supply pipe section provided on the internal combustion engine body and extending parallel to each other from the one side wall to the other side wall; a cover member attached to the one side wall so as to cover a transmission member that transmits power from the crankshaft to the camshaft; a cover side boss extending from a widthwise center portion of the cover member toward the one side wall; a first boss protruding from one of the side walls toward the cover member, and an internal combustion engine body side boss connected to a second boss, wherein the first oil supply pipe portion has a first boss protruding from the one of the side walls toward the cover member, the second oil supply pipe portion has a second boss protruding from the one of the side walls toward the cover member, the internal combustion engine body side boss is installed in an area sandwiched between the first boss and the second boss, the one of the side walls has a main oil supply pipe portion extending in the vertical direction of the side wall, and the internal combustion engine body side boss is installed in an area adjacent to the main oil supply pipe portion .

In this way, the present invention can increase the rigidity of the part of the internal combustion engine body to which the cover member is fastened, and suppress vibration of the cover member.

FIG. 1 is a front view of an internal combustion engine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. FIG. FIG. 4 is an inside view of the upper part of a chain cover for an internal combustion engine according to one embodiment of the present invention. FIG. 5 is a front view of an internal combustion engine according to one embodiment of the present invention, showing the front wall of the cylinder head with the chain cover removed.

The mounting structure for a cover member of an internal combustion engine according to one embodiment of the present invention comprises an internal combustion engine body having one side wall and another side wall located on the opposite side of the one side wall in the axial direction of the crankshaft, and supporting the crankshaft and camshaft so as to be freely rotatable; a first oil supply pipe section and a second oil supply pipe section provided on the internal combustion engine body and extending parallel to each other from the one side wall to the other side wall; a cover member attached to the one side wall so as to cover a transmission member that transmits power from the crankshaft to the camshaft; and The mounting structure for the cover member of an internal combustion engine includes a cover side boss extending from the widthwise center toward one side wall, and an internal combustion engine body side boss provided on one side wall and connected to the cover side boss by a fastener, the first oil supply pipe section has a first boss protruding from one side wall toward the cover member side, the second oil supply pipe section has a second boss protruding from one side wall toward the cover member side, and the internal combustion engine body side boss is installed in the area between the first boss and the second boss.

As a result, the mounting structure for the cover member of an internal combustion engine according to one embodiment of the present invention can increase the rigidity of the part of the internal combustion engine body to which the cover member is fastened, and can suppress vibration of the cover member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a mounting structure for a cover member of an internal combustion engine according to the present invention will be described with reference to the drawings.
1 to 5 are diagrams showing a mounting structure for a cover member of an internal combustion engine according to one embodiment of the present invention. In Fig. 1 to Fig. 5, up, down, front, rear, left and right directions are defined as follows.

The direction along the crankshaft is the front-to-rear direction of the engine, with the side where the timing chain is located being the front and the opposite side being the rear. The direction along the central axis of the cylinder is the up-down direction of the engine, with the cylinder head side being the top and the opposite side being the bottom. The direction that intersects with the crankshaft and the central axis of the cylinder is the left-to-right direction of the engine, with the left side of the central axis of the cylinder when looking at the crankshaft from the rear being the left and the right side of the central axis of the cylinder being the right.

First, the configuration will be described.
1 and 2, engine 1 includes an engine body 2 and a chain cover 40. Engine body 2 includes a cylinder block 3, a cylinder head 4, a cylinder head cover 5, and an oil pan 6. In this embodiment, engine 1 constitutes an internal combustion engine, and engine body 2 constitutes the main body of the internal combustion engine. Note that imaginary line 55 in FIGS. 1 and 4 indicates the boundary between cylinder block 3 and cylinder head 4.

As shown in FIG. 2, the cylinder block 3 is provided with cylinders 3A, 3B, and 3C, which are arranged side by side in the front-to-rear direction of the engine 1. The engine 1 is installed so that the central axes 1C of the cylinders 3A, 3B, and 3C extend in the vertical direction.

In this embodiment, the engine 1 is a three-cylinder engine, but the number of cylinders is not limited to three.

Cylinders 3A, 3B, and 3C each house a piston (not shown), and the piston is connected to crankshaft 7 via a connecting rod (not shown). Crankshaft 7 has a rotation center axis 7a (see FIG. 2) that extends in the front-rear direction, and rotates around rotation center axis 7a.

The pistons reciprocate in the cylinders 3A, 3B, and 3C, rotating the crankshaft 7 via the connecting rods. The cylinder head 4 is formed with multiple intake ports 4P (see FIG. 2) and multiple exhaust ports (not shown).

The intake port 4P is connected to the cylinders 3A, 3B, and 3C, respectively, and introduces intake air into the cylinders 3A, 3B, and 3C. The exhaust manifold is connected to the cylinders 3A, 3B, and 3C through the exhaust port, and collects the exhaust gas discharged from the cylinders 3A, 3B, and 3C and discharges it from the exhaust port to a catalytic converter (not shown).

As shown in FIG. 3, the cylinder head 4 is provided with intake valves 8 and exhaust valves 9, with two intake valves 8 and two exhaust valves 9 installed per cylinder.

The cylinder head 4 rotatably supports an intake camshaft 21 having an intake cam (not shown) and an exhaust camshaft 22 having an exhaust cam (not shown) (see FIG. 1). In this embodiment, the intake camshaft 21 and the exhaust camshaft 22 form camshafts.

The intake valve 8 is operated by the intake cam to open and close the intake port 4P, connecting or blocking the cylinders 3A, 3B, and 3C to the intake port 4P provided for each cylinder. The exhaust valve 9 is operated by the exhaust cam to open and close the exhaust port, connecting or blocking the cylinders 3A, 3B, and 3C to the exhaust port provided for each cylinder.

The cylinder head 4 is equipped with an intake side rocker arm (not shown) that swings when pressed by the intake cam, and a hydraulic intake side lash adjuster 10 that supports one end of the intake side rocker arm and uses hydraulic pressure to adjust the valve clearance (clearance between the intake side rocker arm and the intake valve 8).

The cylinder head 4 is equipped with an exhaust side rocker arm (not shown) that swings when pressed by the exhaust cam, and a hydraulic exhaust side lash adjuster 11 that supports one end of the exhaust side rocker arm and hydraulically adjusts the valve clearance (clearance between the exhaust side rocker arm and the exhaust valve 9).

As shown in FIG. 1, an intake sprocket 21S is provided at the front end of the intake camshaft 21, and an exhaust sprocket 22S is provided at the front end of the exhaust camshaft 22.

A crank sprocket 7S is provided at the front end of the crankshaft 7. A timing chain 14 is wound around the crank sprocket 7S, the intake sprocket 21S, and the exhaust sprocket 22S.

The power of the crankshaft 7 is transmitted to the intake camshaft 21 and the exhaust camshaft 22 via the timing chain 14. In this embodiment, the timing chain 14 constitutes a transmission member.

As shown in Figures 2 and 3, the cylinder head 4 has a front wall 4a and a rear wall 4b. The front wall 4a is provided on the front surface of the cylinder head 4, and the rear wall 4b is provided on the rear surface of the cylinder head 4 located opposite the front wall 4a in the axial direction of the crankshaft 7. In this embodiment, the front wall 4a constitutes one side wall, and the rear wall 4b constitutes the other side wall.

As shown in FIG. 1, the cylinder block 3 is provided with an oil pump 35. The oil pump 35 is driven by the crankshaft 7 to supply oil stored in the oil pan 6 to each part of the engine 1.

As shown in FIG. 2, the chain cover 40 is attached to the front wall 3a of the cylinder block 3 and the front wall 4a of the cylinder head 4, and covers the timing chain 14 (the timing chain 14 is not shown in FIG. 2).

As shown in Figures 3 and 4, the chain cover 40 has a vertical wall 41, a left side wall portion 42, and a right side wall portion 43. The vertical wall 41 faces the front wall 4a of the cylinder head 4 in the front-rear direction.

The left side wall portion 42 and the right side wall portion 43 protrude from the right and left ends of the chain cover 40 in the width direction (vehicle width direction, left-right direction) toward the engine body 2.

As shown in Figures 1 and 4, the left side wall portion 42 and the right side wall portion 43 are provided with a left boss 42A and a right boss 43A, respectively.

The chain cover 40 is fixed to the engine body 2 by fastening bolts 33A and 33B to the front wall 3a of the cylinder block 3 and the front wall 4a of the cylinder head 4 through the left boss 42A and the right boss 43A. The chain cover 40 of this embodiment constitutes a cover member.

An intake valve timing adjustment device (not shown) is provided at the front end of the intake camshaft 21, and the intake valve timing adjustment device adjusts the relative rotational phase of the intake camshaft 21 with respect to the crankshaft 7, thereby adjusting the opening and closing timing (valve timing) of the intake valve 8.

An exhaust valve timing adjustment device (not shown) is provided at the front end of the exhaust camshaft 22, and the exhaust valve timing adjustment device adjusts the relative rotational phase of the exhaust camshaft 22 with respect to the crankshaft 7, thereby adjusting the opening and closing timing (valve timing) of the exhaust valve 9.

As shown in FIG. 1, an intake solenoid 32A is provided on the upper part of the vertical wall 41. The intake solenoid 32A controls the oil supplied to the advance chamber and retard chamber of the intake valve timing adjustment device, and adjusts the relative rotation phase of the intake camshaft 21 with respect to the crankshaft 7.

An exhaust solenoid 32B is provided at the top of the vertical wall 41, and the exhaust solenoid 32B controls the oil supplied to the advance chamber and retard chamber of the exhaust valve timing adjustment device, adjusting the relative rotation phase of the exhaust camshaft 22 with respect to the crankshaft 7.

As shown in FIG. 3, the cylinder head 4 is provided with an intake oil supply pipe section 15 and an exhaust oil supply pipe section 16.

The intake oil supply pipe section 15 and the exhaust oil supply pipe section 16 extend parallel to each other in a straight line from the front wall 4a to the rear wall 4b of the cylinder head 4, and have oil passages 15a and 16a inside.

Oil sent from the oil pump 35 is introduced into the oil passages 15a and 16a. The oil introduced into the oil passage 15a is supplied to the intake side lash adjuster 10, and the oil introduced into the oil passage 16a is supplied to the exhaust side lash adjuster 11.

In this embodiment, the intake side oil supply pipe section 15 constitutes the first oil supply pipe section, and the exhaust side oil supply pipe section 16 constitutes the second oil supply pipe section.

As shown in Figures 2 and 3, a mount attachment portion 44 is provided on the upper part of the vertical wall 41 of the chain cover 40.

The mount attachment portion 44 bulges outward from the vertical wall 41 of the chain cover 40 in a direction away from the engine body 2, i.e., forward. In this embodiment, the vertical wall 41 forms the outer wall of the cover member.

As shown in FIG. 2, a side member 31 is provided in front of the engine 1, and the side member 31 extends in the front-rear direction. As shown in FIG. 3, a mounting seat 44a is provided at the tip of the mount attachment portion 44, and the mounting seat 44a has bolt holes 44b, 44c, and 44d through which bolts (not shown) are inserted.

As shown in FIG. 2, a mount member 51 is attached to the mounting seat 44a. The mount member 51 has a mount bracket 51A, and a bolt is inserted into the rear end of the mount bracket 51A.

The bolts inserted into the rear end of the mount bracket 51A are inserted into the bolt holes 44b, 44c, and 44d and fastened to the threaded portions on the inner circumference of the bolt holes 44b and 44c. This fixes the rear end of the mount bracket 51A to the mounting seat 44a.

The mount member 51 is equipped with a vibration absorbing member 51B, which is attached to the side member 31. The front end of the mount bracket 51A is attached to the vibration absorbing member 51B, and the engine body 2 is elastically supported by the side member 31 via the mount member 51. The side member 31 in this embodiment constitutes the vehicle body.

As shown in Figures 1 and 4, central bosses 45A, 45B, and 45C are provided on the vertical wall 41 of the chain cover 40. The central boss 45A is provided at the center of the vertical wall 41 in the width direction and extends from the vertical wall 41 toward the front wall 4a of the cylinder head 4.

The central boss 45B is located at the center of the vertical wall 41 in the width direction and extends from the vertical wall 41 toward the front wall 4a of the cylinder head 4.

The central boss 45C is located at the center of the vertical wall 41 in the width direction and extends from the vertical wall 41 toward the front wall 4a of the cylinder block 3.

As shown in Figures 2 and 3, a central boss 4A having a threaded portion is provided on the front wall 4a of the cylinder head 4, and the central boss 4A extends from the front wall 4a toward the vertical wall 41.

As shown in Figures 1 and 2, a bolt 33C is inserted into the central boss 45A of the vertical wall 41, and the bolt 33C is screwed into the central boss 4A.

As shown in FIG. 2, the central boss 4A and the central boss 45A are installed above the mount attachment portion 44, and the central boss 45A is connected to the mount attachment portion 44.

A boss (not shown) having a threaded portion is provided on the front wall 4a of the cylinder head 4. A bolt 33D (see FIG. 1) is inserted into the central boss 45B of the vertical wall 41, and the bolt 33D is screwed into this boss.

A boss (not shown) having a threaded portion is provided on the front wall 3a of the cylinder block 3. A bolt 33E (see FIG. 1) is inserted into the central boss 45C of the vertical wall 41, and the bolt 33E is screwed into this boss.

That is, the chain cover 40 is fixed to the engine body 2 by fastening the left boss 42A, right boss 43A, central boss 45A, central boss 45B, and central boss 45C to the front wall 3a of the cylinder block 3 and the front wall 4a of the cylinder head 4 with bolts 33A, 33B, 33C, 33D, and 33E.

In this embodiment, the central boss 45A constitutes the cover side boss, and the central boss 4A constitutes the engine body side boss. The bolt 33C constitutes the fastener.

As shown in Figures 3 and 5, a boss 15A is provided at the front end of the intake oil supply pipe section 15, and the boss 15A protrudes from the front wall 4a toward the chain cover 40. The boss 15A has an opening that is opened to process the oil passage 15a with a drill or the like, and a plug (not shown) is attached to the opening of the boss 15A.

A boss 16A is provided at the front end of the exhaust oil supply pipe section 16, and the boss 16A protrudes from the front wall 4a toward the chain cover 40. The boss 16A has an opening that is opened to process the oil passage 16a with a drill or the like, and a plug (not shown) is attached to the opening of the boss 16A.

As shown in Figures 3 and 5, the central boss 4A is located in the area 53 between the bosses 15A and 16A. In other words, the central boss 4A is located between the bosses 15A and 16A in the left-right direction.

The gap between central boss 4A and boss 15A in the left-right direction is smaller than the width of central boss 4A, and the gap between central boss 4A and boss 16A in the left-right direction is smaller than the width of central boss 4A.

As a result, central boss 4A and boss 15A are installed close to each other in the left-right direction, and central boss 4A and boss 16A are installed close to each other in the left-right direction. Therefore, the rigidity of the front wall 4a is high in the areas around central boss 4A, boss 15A, and boss 16A. In this embodiment, boss 15A constitutes the first boss, and boss 16A constitutes the second boss.

As shown in FIG. 5, a main oil supply pipe section 46 and a secondary oil supply pipe section 47 are provided on the front wall 4a of the cylinder head 4.

The main oil supply pipe section 46 extends in the vertical direction of the front wall 4a. A main oil passage 46a is provided inside the main oil supply pipe section 46, and oil is supplied to the main oil passage 46a from the oil pump 35.

The main oil passage 46a supplies operating oil to, for example, the exhaust valve timing adjustment device.

The secondary oil supply pipe section 47 extends from the primary oil supply pipe section 46 to the right in the width direction of the front wall 4a, and then extends upward.

A secondary oil passage 47a is provided inside the secondary oil supply pipe section 47, and oil is supplied to the secondary oil passage 47a from the main oil passage 46a. The secondary oil passage 47a supplies operating oil to, for example, the intake valve timing adjustment device.

A central boss 4A is provided in an area 54 adjacent to the main oil supply pipe section 46 and the secondary oil supply pipe section 47. Specifically, the central boss 4A is located on the opposite side (right side) of the main oil supply pipe section 46 from the boss 16A, and is provided above the secondary oil supply pipe section 47. The main oil supply pipe section 46 is also sandwiched between the boss 15A and the boss 16A in the left-right direction.

As shown in FIG. 4, the vertical wall 41 of the chain cover 40 is provided with a first rib 48A, a second rib 48B, a third rib 48C, a fourth rib 48D, a fifth rib 48E, a sixth rib 48F, a seventh rib 48G, an eighth rib 48H, a ninth rib 48I and a tenth rib 48J.

The first rib 48A protrudes from the vertical wall 41 toward the cylinder head 4 and extends linearly in the vertical direction in the center of the width of the chain cover 40. The first rib 48A extends from the central boss 45A to the central boss 45B, connecting the central boss 45A and the central boss 45B.

The second rib 48B protrudes from the vertical wall 41 toward the cylinder head 4. The second rib 48B extends in a straight line diagonally downward to the left from the central boss 45A toward the left side wall 42, connecting the central boss 45A and the left side wall 42.

The third rib 48C protrudes from the vertical wall 41 toward the cylinder head 4. The third rib 48C extends in a straight line diagonally downward to the right from the central boss 45A toward the right side wall portion 43, connecting the central boss 45A and the right side wall portion 43.

The fourth rib 48D protrudes from the vertical wall 41 toward the cylinder head 4. The fourth rib 48D extends in a straight line diagonally upward to the left from the central boss 45B toward the second rib 48B, connecting the central boss 45B and the second rib 48B.

The fifth rib 48E protrudes from the vertical wall 41 toward the cylinder head 4. The fifth rib 48E extends in a straight line obliquely upward to the right from the central boss 45B toward the third rib 48C, connecting the central boss 45B and the third rib 48C.

The sixth rib 48F protrudes from the vertical wall 41 toward the cylinder head 4 and extends vertically in the center of the width of the chain cover 40.

The sixth rib 48F extends downward from the central boss 45B to the central boss 45C, connecting the central boss 45B and the central boss 45C.

The seventh rib 48G protrudes from the vertical wall 41 toward the cylinder head 4. The seventh rib 48G extends in a straight line diagonally downward to the left from the central boss 45B toward the left side wall 42, connecting the central boss 45B and the left side wall 42.

The eighth rib 48H protrudes from the vertical wall 41 toward the cylinder head 4. The eighth rib 48H extends in a straight line diagonally downward to the right from the central boss 45B toward the right side wall portion 43, connecting the central boss 45B and the right side wall portion 43.

The ninth rib 48I protrudes from the vertical wall 41 toward the cylinder head 4. The ninth rib 48I extends linearly from the central boss 45B toward the right side wall 43, connecting the central boss 45B and the right side wall 43.

The tenth rib 48J protrudes from the vertical wall 41 toward the cylinder head 4. The tenth rib 48J extends linearly from the central boss 45C toward the right side wall 43, connecting the central boss 45C and the right side wall 43.

Next, the effect of the mounting structure of the chain cover 40 of the engine 1 according to this embodiment will be described.
The mounting structure of the chain cover 40 of the engine 1 of this embodiment has a front wall 4a and a rear wall 4b located opposite the front wall 4a in the axial direction of the crankshaft 7, and is equipped with a cylinder head 4 that rotatably supports the crankshaft 7, the intake camshaft 21, and the exhaust camshaft 22, and an intake side oil supply pipe section 15 and an exhaust side oil supply pipe section 16 that are provided on the cylinder head 4 and extend parallel to each other from the front wall 4a to the rear wall 4b.

The mounting structure of the chain cover 40 of the engine 1 includes a chain cover 40 attached to the front wall 4a so as to cover the timing chain 14 that transmits power from the crankshaft 7 to the intake camshaft 21 and the exhaust camshaft 22, a central boss 45A that extends from the widthwise center of the chain cover 40 toward the front wall 4a, and a central boss 4A that is provided on the front wall 4a and connected to the central boss 45A by a bolt 33C.

The intake oil supply pipe section 15 has a boss 15A that protrudes from the front wall 4a toward the chain cover 40, and the exhaust oil supply pipe section 16 has a boss 16A that protrudes from the front wall 4a toward the chain cover 40.

In the cylinder head 4 of this embodiment, the area 53 adjacent to the intake side oil supply pipe section 15 and the exhaust side oil supply pipe section 16 in the front wall 4a of the cylinder head 4 has high rigidity and is less susceptible to vibration.

Then, in the mounting structure of the chain cover 40 of the engine 1 in this embodiment, the central boss 4A is placed in the area 53 between the bosses 15A and 16A, so that the central boss 4A can be reinforced by the highly rigid bosses 15A and 16A, and vibration of the central boss 4A can be suppressed.

Therefore, by fastening the central boss 45A of the chain cover 40 to the highly rigid central boss 4A with the bolt 33C, vibration of the chain cover 40 can be suppressed.

In this way, the mounting structure of the chain cover 40 of the engine 1 can increase the rigidity of the portion of the front wall 4a of the cylinder head 4 to which the chain cover 40 is fastened, and can suppress vibration of the chain cover 40.

In addition, the mounting structure of the chain cover 40 of the engine 1 of this embodiment includes an intake side lash adjuster 10 provided on the cylinder head 4 to adjust the valve clearance of the intake valve 8, and an exhaust side lash adjuster 11 provided on the cylinder head 4 to adjust the valve clearance of the exhaust valve 9.

The intake side oil supply pipe section 15 supplies oil to the intake side lash adjuster 10, and the exhaust side oil supply pipe section 16 supplies oil to the exhaust side lash adjuster 11.

As a result, vibration of the central boss 4A can be suppressed simply by installing the intake side oil supply pipe section 15 for the existing intake side lash adjuster 10 and the exhaust side oil supply pipe section 16 for the exhaust side lash adjuster 11 near the central boss 4A in the cylinder head 4.

As a result, the structure of the cylinder head 4 can be simplified compared to adding a dedicated rib to the front wall 4a of the cylinder head 4 to reinforce the central boss 4A, and ultimately the structure of the engine 1 can be simplified.

In addition, according to the mounting structure of the chain cover 40 of the engine 1 of this embodiment, the chain cover 40 has a mount attachment portion 44 to which a mount bracket 51A that supports the engine body 2 on the side member 31 is attached, and the mount attachment portion 44 bulges out in a direction away from the engine body 2 relative to the vertical wall 41 of the chain cover 40.

The mount attachment portion 44 of the chain cover 40 protrudes outwardly to a large extent, so the portion above the mount attachment portion 44 is prone to vibrating due to the oscillation of the engine 1.

In the mounting structure of the chain cover 40 of the engine 1 of this embodiment, the central boss 4A on the front wall 4a side, which has high rigidity, is connected to the central boss 45A on the chain cover 40 side, which is installed on the upper side of the mount attachment part 44, so vibration of the chain cover 40 can be suppressed more effectively.

In addition, according to the mounting structure of the chain cover 40 of the engine 1 of this embodiment, the front wall 4a has a main oil supply pipe section 46 and a secondary oil supply pipe section 47.

The main oil supply pipe section 46 extends in the vertical direction of the front wall 4a, and the secondary oil supply pipe section 47 extends from the main oil supply pipe section 46 in the width direction of the front wall 4a and then extends upward.

In addition, the central boss 4A is installed in an area 54 adjacent to the main oil supply pipe section 46 and the secondary oil supply pipe section 47.

As a result, the front wall 4a can be reinforced by the main oil supply pipe section 46 and the secondary oil supply pipe section 47, both of which have high rigidity. Therefore, by locating the central boss 4A in the highly rigid area 54 adjacent to the main oil supply pipe section 46 and the secondary oil supply pipe section 47, vibration of the central boss 4A can be more effectively suppressed, and vibration of the chain cover 40 can be more effectively suppressed.

In addition, according to the mounting structure of the chain cover 40 of the engine 1 of this embodiment, the central boss 45A and the central boss 45B are connected by the first rib 48A, the central boss 45B and the left side wall portion 42 are connected by the second rib 48B, and the central boss 45B and the right side wall portion 43 are connected by the third rib 48C.

As a result, the central boss 45A can be further reinforced by the ribs 48A, 48B, and 48C in addition to the bosses 15A and 16A, and vibration of the central boss 4A can be more effectively suppressed. As a result, vibration of the chain cover 40 can be more effectively suppressed.

Although an embodiment of the present invention has been disclosed, it is apparent that modifications may be made by one of ordinary skill in the art without departing from the scope of the present invention. All such modifications and equivalents are intended to be encompassed by the following claims.

1...Engine (internal combustion engine), 2...Engine body (internal combustion engine body), 4...Cylinder head, 4A...Central boss (boss on the internal combustion engine body side), 4a...Front wall (one side wall), 4b...Rear wall (the other side wall), 7...Crankshaft, 8...Intake valve, 9...Exhaust valve, 10...Intake side lash adjuster, 11...Exhaust side lash adjuster, 14...Timing chain, 15...Intake side oil supply pipe section (first oil supply pipe section), 15A...Boss (first boss), 16...Exhaust side oil supply pipe section (second oil supply pipe section), 16A... boss (second boss), 31... side member (vehicle body), 33C... bolt (fastener), 40... chain cover (cover member), 41... vertical wall (outer wall of cover member), 44... mount attachment section, 45A... central boss (cover side boss), 46... main oil supply pipe section, 47... secondary oil supply pipe section, 51A... mount bracket, 53... area (area sandwiched between the first boss and the second boss), 54... area (area adjacent to the main oil supply pipe section and secondary oil supply pipe section)

Claims (4)

an internal combustion engine body having one side wall and another side wall located on the opposite side of the one side wall in the axial direction of the crankshaft, the internal combustion engine body rotatably supporting the crankshaft and the camshaft;
a first oil supply pipe portion and a second oil supply pipe portion provided in the internal combustion engine body and extending in parallel to each other from the one side wall to the other side wall;
a cover member attached to the one side wall so as to cover a power transmission member that transmits power from the crankshaft to the camshaft;
a cover side boss extending from a width direction center portion of the cover member toward the one side wall;
an internal combustion engine body side boss provided on the one side wall and connected to the cover side boss by a fastener,
the first oil supply pipe portion has a first boss protruding from the one side wall toward the cover member,
the second oil supply pipe portion has a second boss protruding from the one side wall toward the cover member,
the internal combustion engine body side boss is disposed in a region sandwiched between the first boss and the second boss ,
the one side wall has a main oil supply pipe portion extending in a vertical direction of the side wall,
13. A mounting structure for a cover member of an internal combustion engine, wherein the boss on the internal combustion engine body side is disposed in an area adjacent to the main oil supply pipe portion . the one side wall has a sub-oil supply pipe portion extending from the main oil supply pipe portion in a width direction of the one side wall and then extending upward,
2. The cover member mounting structure for an internal combustion engine according to claim 1, wherein the boss on the internal combustion engine body side is disposed in an area adjacent to the secondary oil supply pipe portion . the internal combustion engine body includes a cylinder head having the one side wall and the other side wall, an intake side lash adjuster provided in the cylinder head for adjusting a valve clearance of an intake valve, and an exhaust side lash adjuster provided in the cylinder head for adjusting a valve clearance of an exhaust valve,
the first oil supply pipe portion is provided in the cylinder head and supplies oil to the intake side lash adjuster,
3. The mounting structure for a cover member of an internal combustion engine according to claim 1, wherein the second oil supply pipe portion is provided in the cylinder head and supplies oil to the exhaust-side lash adjuster . the cover member has a mount attachment portion to which a mount bracket that supports the internal combustion engine body on a vehicle body is attached,
the mount attachment portion bulges out from an outer wall of the cover member in a direction away from the internal combustion engine body,
4. The mounting structure for a cover member of an internal combustion engine according to claim 1, wherein the cover-side boss and the internal combustion engine body-side boss are disposed above the mount attachment portion .

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