FR3084108A1 - COVER STRUCTURE OF AN INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

The cover structure of an internal combustion engine makes it possible to reduce a vibration of a hydraulic control valve attached to a cover element and therefore to improve the reliability of such a valve. The structure comprises a motor body covered laterally by a chain cover (18) which comprises, in a connection wall (19): - an oil passage part (24) of the connection wall, swollen in the direction of the motor body, extending in the up-down direction of the cover (18); and - an oil passage part (25) of the connection wall, swollen in the direction of the motor body, connected to upper ends of the side walls (19a, 19b) and the oil passage part (24) . A swollen cylinder portion of the connecting wall, connected to a wall portion of the oil passage portion (25) and configured to receive a portion of the hydraulic control valve extends along the passage portion d oil (25). Figure for the abstract: Figure 4

Description

Description

Title of the invention: COVER STRUCTURE OF AN INTERNAL COMBUSTION ENGINE [0001] The present invention relates to a cover structure of an internal combustion engine mounted on a vehicle.

As an internal combustion engine mounted on a vehicle, an internal combustion engine is known which comprises an encapsulation element (a chain cover) covering a timing chain and in which an oil control valve supplying hydraulic oil to a variable valve device is attached to the encapsulating element (see JP 2005-320974 A).

In the internal combustion engine, an upper part of the encapsulation element is provided with an engine mounting support portion and the internal combustion engine is supported by a vehicle body by the mounting support portion of the engine. The oil control valve is provided adjacent to the engine mounting bracket portion at a height position substantially identical to that of the engine mounting bracket and an oil passage communicating with the engine control valve. oil is formed inside the encapsulation element.

In such an internal combustion engine of the prior art, since the oil control valve is provided adjacent to the engine mounting support part in a height position substantially identical to that of the support part When mounting the engine, it is to be feared that the oil control valve may be vibrated due to a vibration transmitted from the internal combustion engine to the vehicle body.

However, in document JP 2005-320974 A, since an oil control valve installation structure suitable for reducing the vibration of the oil control valve is not taken into consideration, it there is still room for improvement.

The present invention has been made in view of the problems described above and an object of the present invention is to provide a cover structure of an internal combustion engine capable of reducing a vibration of a hydraulic control valve attached to a cover member and thereby improving the reliability of the hydraulic control valve.

According to aspects of the present invention, there is provided a cover structure of an internal combustion engine comprising: an engine body comprising a crankshaft, a camshaft, and a variable valve timing mechanism modifying a phase of relative rotation of the camshaft relative to the crankshaft; and a cover member comprising a pair of side walls attached to an end portion of the engine body, a connecting wall provided between the pair of side walls for covering the end portion of the engine body and connecting the pair of side walls, and a mounting attachment portion provided at an upper portion of the connecting wall and provided such that a mounting member provided in a vehicle body is attached thereto; and a hydraulic control valve including a valve portion and supplying hydraulic oil to the variable valve mechanism, wherein the cover member includes a bulged cylinder portion which is swollen from the swollen connecting wall towards on a side opposite the motor body and provided in a lower side of the mounting fixing part so that the valve part is inserted therein, a first cylindrical part swollen from the connecting wall towards the body motor and extending in the up-down direction of the cover member, a second cylindrical part swollen from the connecting wall towards the motor body and connected to an upper end of the first cylindrical part and to the pair side walls, and an inlet oil passage supplying oil to the swollen cylinder part, in which the entry oil passage ée comprises a first oil passage formed inside the first cylindrical part and a second oil passage formed inside the second cylindrical part and communicating with the first oil passage and the swollen cylinder part , and wherein the bulged cylinder portion includes a wall portion connected to a wall portion of the second cylindrical portion and extends along the second cylindrical portion.

According to the present invention with the configuration described above, since it is possible to reduce the vibration of the hydraulic control valve attached to the cover member, it is possible to improve the reliability of the valve. hydraulic control.

Embodiments of the cover structure include one or more of the following features:

the cover element comprises a boss part having one end connected to the cylinder part and the other end connected to the engine body, the boss part comprising an outlet oil passage supplying oil from the hydraulic control valve with variable valve timing mechanism;

- The boss part is connected to the second cylindrical part;

- The connecting wall is provided with a third cylindrical part comprising a passage for drainage oil discharging oil from the cylinder part to a space between the cover element and the motor body;

- The third cylindrical part is connected to the second cylindrical part on a side opposite to the boss part;

- The cylinder part is connected to the second cylindrical part by a plate-shaped rib, which preferably has a thickness equal to a diameter of the second cylindrical part.

Other characteristics, details and advantages of the invention will appear on reading the detailed description below, and on analysis of the accompanying drawings, in which:

[fig.l] Figure 1 is a front view of a powertrain according to an embodiment of this invention;

[fig.2] Figure 2 is a perspective view of a chain cover according to an embodiment of this invention;

[fig.3] Figure 3 is an external view (right view) of the chain cover according to an embodiment of the present invention;

[fig.4] Figure 4 is an internal view (left view) of the chain cover according to an embodiment of the present invention;

[fig.5] Figure 5 is a plan view of a chain cover according to an embodiment of this invention;

[fig.6] Figure 6 is a front view of a chain cover according to an embodiment of this invention;

[Fig.7] Figure 7 is an enlarged view of an inner top of the chain cover according to an embodiment of the present invention;

[Fig.8] Figure 8 is a cross-sectional view in the direction VIII-VIII of Figure 7;

[Fig.9] Figure 9 is a cross-sectional view in the direction IX-IX of Figure 7;

[Fig.10] Figure 10 is a cross-sectional view along the direction X-X of Figure 7;

[fig.l 1] Figure 11 is a cross-sectional view in the direction XI-XI of Figure 7.

Embodiment (s) of the Invention A cover structure of an internal combustion engine comprises: an engine body comprising a crankshaft, a camshaft, and a variable valve timing mechanism modifying a phase of relative rotation of the camshaft relative to the crankshaft; and a cover member comprising a pair of side walls attached to an end portion of the engine body, a connecting wall provided between the pair of side walls for covering the end portion of the engine body and connecting the pair of side walls, and a mounting attachment portion provided at an upper portion of the connecting wall and provided such that a mounting member provided in a vehicle body is attached thereto; and a hydraulic control valve comprising a valve portion and supplying hydraulic oil to the variable valve mechanism, wherein the cover member includes a cylinder portion of the connecting wall swollen towards one side opposite the motor body (typically formed as an exterior projection) and provided in a lower side of the mounting fixing part so that the valve part is inserted therein, a first cylindrical part bulging from the wall of connection towards the motor body and extending in the up-down direction of the cover element, a second cylindrical part swollen from the connection wall towards the motor body and connected to an upper end of the first part cylindrical and to the pair of side walls, and an inlet oil passage providing oil to the swollen cylinder part, in which e the inlet oil passage comprises a first oil passage formed inside the first cylindrical part and a second oil passage formed inside the second cylindrical part and communicating with the first passage d oil and the swollen cylinder portion, and wherein the swollen cylinder portion includes a wall portion connected to a wall portion of the second cylindrical portion and extends along the second cylindrical portion. Thus, since it is possible to reduce the vibration of the hydraulic control valve attached to the cover member, it is possible to improve the reliability of the hydraulic control valve.

[Embodiment (s)] [0011] Hereinafter, embodiments of a cover structure of an internal combustion engine according to the present invention will be described with reference to the drawings.

Figures 1 to 11 are diagrams illustrating a cover structure of an internal combustion engine according to embodiments of this invention. In Figures 1 to 11, the directions up, down, front, back, left and right are defined so that a direction of the width of the vehicle is a left-right direction and a direction of the height of the vehicle is up-down direction while a forward direction of travel is a forward direction and a backward direction of movement is a backward direction.

First, a configuration is described.

In FIG. 1, a vehicle 1 comprises a left lateral element 2L and a right lateral element 2R. The left side member 2L and the right side member 2R extend in the front-rear direction while being separated from each other in the width direction of the vehicle 1 (hereinafter called the direction of vehicle width).

The left side member 2L and the right side member 2R of this embodiment constitute a vehicle body of the present invention.

The left side element 2L and the right side element 2R are respectively provided with a left anti-vibration mounting element 3L and a right anti-vibration mounting element 3R. The left anti-vibration mounting element 3L and the right anti-vibration mounting element 3R are connected to a powertrain 4 and the powertrain 4 is resiliently supported by the left side element 2L and the right side element 2R via the left anti-vibration mounting element 3L and the right anti-vibration mounting element 3R.

The powertrain 4 includes an engine 5 which is an internal combustion engine and a transmission 6 and the engine 5 and the transmission 6 are arranged side by side in the width direction of the vehicle inside the direction of the width of the vehicle with respect to the left side element 2L and the right side element 2R. The motor 5 converts thermal energy into mechanical energy and the transmission 6 delivers the speed of rotation of the motor 5 by changing gears.

The engine 5 comprises an engine body 7 and the engine body 7 comprises a cylinder block 11, a cylinder head 12, a cylinder head cover 13, and an oil sump 14.

A chain cover 18 (see Figures 2 and 3) is attached to a right end portion (not shown) of a cylinder head cover 13 and right end portions 1a and 12a of cylinder block 11 and a cylinder head 12, and the chain cover 18 covers a timing chain 8 provided in the right end portion of the cylinder head cover 13 and in the right end portions 11a and 12a bloccylindres 11 and cylinder head 12 from a right side.

The chain cover 18 of this embodiment constitutes a cover member of this invention and the straight end portions 1a and 12a of the cylinder blocks 11 and the cylinder head 12 in the direction of the width of the vehicle and the right end portion of the cylinder head cover 13 constitutes an end portion of an engine body of this invention. Hereinafter, the right end portions 11a and 12a of the cylinder block 11 and of the cylinder head 12 in the vehicle width direction and the right end portion of the cylinder head cover 13 are designated as right end of an engine body 7.

The cylinder block 11 is provided with a plurality of cylinders (not shown). A piston (not shown) is housed in the cylinder and the piston moves in the up-down direction relative to the cylinder. The piston is connected to a crankshaft 15 (see Figure 3) via a connecting rod (not shown) and the reciprocating movement of the piston is converted into a rotational movement of the crankshaft 15 via the connecting rod.

In Figure 1, a central axis of rotation of the crankshaft 15 is indicated by a mixed line. The crankshaft 15 extends in the width direction of the vehicle and the engine 5 is configured as a transverse engine.

The cylinder head 12 is provided with a plurality of intake ports (not shown), a plurality of intake valves (not shown) opening and closing the intake ports, a plurality of ports exhaust (not shown), and a plurality of 10V exhaust valves opening and closing the exhaust ports (as shown in dashed lines in Figure 1). The intake port introduces air into a cylinder and the exhaust port discharges combustion-generated exhaust gas into the cylinder from the cylinder.

The exhaust valve 10V and the intake valve are provided in two positions of each cylinder and a motor 5 of this embodiment is configured as, for example, four-cylinder engine. In addition, the number of cylinders is not limited to four cylinders.

An evolving valve chamber (not shown) is formed between the cylinder head 12 and the cylinder head cover 13 and the evolving valve chamber houses an intake camshaft 9 and an exhaust camshaft 10 illustrated in figure 4.

In Figure 4, an end portion of a crankshaft 15 is provided with a crankshaft pinion 15A and end portions of the intake camshaft 9 and the shaft to exhaust cams 10 are respectively provided with an intake cam gear 9a and an exhaust cam gear 10A.

The timing chain 8 is wound on the crankshaft sprocket 15A, the intake cam sprocket 9A, and the exhaust cam sprocket 10A and the crankshaft 15, the camshaft intake 9 and the exhaust camshaft 10 are connected by the timing chain 8. Consequently, the power from the crankshaft 15 is transmitted to the intake camshaft 9 and to the shaft with exhaust cams 10 via the timing chain 8.

The intake camshaft 9 is installed at the rear side of the exhaust camshaft 10 and the end portion of the intake camshaft 9 is provided with a variable valve timing mechanism on the intake side 51. In FIGS. 2 and 3, an electric actuator 3 is attached to the chain cover 52.

The variable valve timing mechanism on the intake side 51 is driven by the electric actuator 52 so that the relative rotation phase of the intake camshaft 9 relative to the crankshaft 15 changes to delay side and the advance side and the intake valve opening and closing the synchronization switches to the advance side and the delay side.

In Figure 4, the end portion of the exhaust camshaft 10 is provided with a variable valve timing mechanism on the exhaust side 53 and the variable valve mechanism on the exhaust side 53 comprises a chamber advance and a delay chamber (not shown) into which oil is introduced.

When oil is introduced into the advance chamber, the variable valve timing mechanism on the exhaust side 53 modifies the relative rotation phase of the exhaust camshaft 10 relative to the shaft of crankshaft 15 towards the advance side and modifies the opening and closing synchronization of the exhaust valve 10V towards the advance side. When oil is introduced into the delay chamber, the exhaust side variable valve mechanism 53 changes the relative rotation phase of the exhaust camshaft 10 relative to the crankshaft 15 toward the delay side and changes the timing of opening and closing the exhaust valve 10V to the delay side. The exhaust camshaft 10 of this embodiment constitutes a camshaft of the present invention and the exhaust side variable valve mechanism 53 constitutes an exhaust valve mechanism of the present invention.

An oil sump 14 stores oil to lubricate the crankshaft 15 or the piston or to operate the variable valve timing mechanism on the exhaust side 53.

As illustrated in Figures 4 and 7, the chain cover 18 includes a connecting wall 19 and side walls 19A and 19B. As illustrated in FIG. 5, parts of flanges 19a and 19b are formed at the level of the front ends of the side walls 19A and 19B, that is to say, on the side of the motor body 7 and the parts of flanges 19a and 19b are fixed to the right end part of the motor body 7 by a screw or bolt 20A. The side walls 19A and 19B of this embodiment include the flange parts 19a and 19b.

The connecting wall 19 is provided between the side walls 19A and 19B so as to cover the right end part of the motor body 7 and connects the side walls 19A and 19B.

In Figures 2 and 3, an upper part of a front surface 19f of the connecting wall 19 is provided with a mounting fixing part 22. In Figure 1, the mounting fixing part 22 is enlarged from the front surface 19f of the connecting wall 19 towards a right anti-vibration mounting element 3R and an arm part 3B of the right anti-vibration mounting element 3R is attached to an upper surface of the part mounting fixture 22.

The right anti-vibration mounting element 3R houses an elastic body such as rubber (not shown) and comprises a mounting element body 3A which is attached to a right lateral element 2R and an arm part 3B which extends from the mounting member body 3A to the mounting fixing part 22 and is fixed to the mounting fixing part 22 by a screw or bolt 20B.

The motor 5 is resiliently supported by the right side element 2R via the right anti-vibration mounting element 3R while being suspended by the right anti-vibration mounting element 3R. The 3R straight anti-vibration mounting element of this embodiment constitutes a mounting element of this invention.

In Figures 3 and 4, a lower part of the chain cover 18 is provided with an oil pump unit 23. The oil pump unit 23 comprises a bulged part 33, which is swollen from the surface front 19f of the connecting wall 19 towards the right anti-vibration mounting element 3R, and a pump housing 23A, which is attached to a rear surface 19r of the connecting wall 19 so as to correspond to the part swollen 33.

The oil pump unit 23 includes an oil pump 23B (shown by a dashed line in Figure 4) rotatably housed in the bulged portion 33 and the pump housing 23A. A suction port and a discharge port (not shown) are formed between the pump housing 23A and the connecting wall 19.

The oil pump 23A includes an inner rotor (not shown) which is attached to the crankshaft 15 and is rotated by the crankshaft 15 and an outer rotor (not shown) which is disposed outside in the radial direction so as to surround the inner rotor.

The oil pump 23A is configured as, for example, a trochoid oil pump and an actuation chamber (not shown) storing oil is formed between the external pinion and the internal pinion when a pinion inner formed on the outer rotor is in contact with an outer pinion formed on the inner rotor.

In the oil pump 23A, the power of the crankshaft 15 is transmitted to the inner rotor so that the inner rotor and the outer rotor rotate in one direction. At this time, since the volume of the actuating chamber increases and decreases continuously, the oil stored in the oil pan 14 is sucked from the suction port and the sucked oil is discharged from the port of repression.

In Figure 4, parts of oil passages 24 and 25 are formed in the body body in the chain cover 18. The oil passage portion 24 is swollen from the front surface 19f of the connecting wall 19 towards the right anti-vibration mounting element 3R located outside (see FIG. 3), is swollen from the rear surface 19r of the connecting wall 19 in the direction of the motor body 7 located inside, and is formed in a cylindrical shape.

An oil passage 24a (see FIG. 8) is formed inside the oil passage part 24 and of the oil discharged from the discharge orifice of the oil pump unit 23 is introduced into the oil passage 24a. The oil passage part 24 extends upwards from the oil pump unit 23 and is connected to the lower part of the mounting fixing part 22.

As illustrated in Figure 3, the oil passage portion 24 extends along the side wall 19B in a position adjacent to the side wall 19B and is inclined towards the front side relative to the oil pump unit 23 in the front-rear direction.

In Figure 4, the oil passage portion 25 is swollen inward from the rear surface 19r of the connecting wall 19 and is formed in cylindrical shape. The oil passage part 25 is connected to the upper end of the oil passage part 24. The oil passage part 25 extends from the upper end of the oil passage part 24 , in the width direction of the connecting wall 19, towards the side walls 19A and 19B and is connected to the side walls 19A and 19B.

The oil passage portion 25 extends from an end portion near the mounting attachment portion 22 along the bottom of the mounting attachment portion 22 in the width direction chain cover 18.

In this way, the oil passage part 25 is connected to the upper end of the oil passage part 24, to the side wall 19A and to the side wall 19B.

In Figures 4 and 9, an oil passage 25a is formed inside the oil passage part 25 and the oil passage 25a communicates with the oil passage 24a. The oil passage part 24 of this embodiment constitutes a first cylindrical part of the present invention and the oil passage part 25 constitutes a second cylindrical part of this invention. The oil passage 24a constitutes a first oil passage of this invention and the oil passage 25a constitutes a second oil passage of this invention.

In Figures 2 and 3, an upper part of the connecting wall 19 is provided with a cylinder part 27. The cylinder part 27 is swollen from the front surface 19f of the connecting wall 19 in the direction of the side opposite the motor body 7, that is to say in the direction of the side of the right anti-vibration mounting element 3R.

The cylinder part 27 is provided at the level of the lower side of the mounting fixing part 22 and is connected to the mounting fixing part 22. A hydraulic control valve 28 is inserted in the cylinder part 27.

As illustrated in Figure 9, the hydraulic control valve 9 comprises a slide valve 28A which is inserted in the cylinder part 27 and a control device 28B such as an electromagnetic solenoid projecting outwards from the cylinder part 27 and driving the slide valve 28A.

The cylinder part 27 comprises a wall part 27A connected to a wall part 25A of the oil passage part 25 and the cylinder part 27 extends along the oil passage part 25 in the front-back direction. In other words, the cylinder part 27 and the oil passage part 25 are adjacent to each other in the width direction of the vehicle at the same height position through the parts of walls 27A and 25A.

An oil passage 19g is formed in the connecting wall 19. The oil passage 19g allows the oil passage 25a to communicate with the cylinder part 27 and the oil flowing through the passage d oil 25a is introduced into the cylinder part 27 through the oil passage 19g. The oil passage 19g and the oil passages 24a and 25a of this embodiment constitute an inlet oil passage of the present invention.

In Figure 3, the front surface 19f of the connecting wall 19 is provided with a bulged part 29. The bulged part 29 is swollen from the front surface 19f of the connecting wall 19 in the direction of the element of right anti-vibration mounting 3R (see FIG. 1) and is connected to the lower part of the cylinder part 27. The bulged part 29 extends in the direction of the width of the chain cover 18 and connects the passage part d oil 24 and the flange portion 19a.

Referring to Figures 4 and 7, the rear surface 19r of the connecting wall 19 is provided with a boss portion 30. In Figure 10, one end of the boss portion 30 is connected to the cylinder portion 27 and its other end is connected to the engine body 7, typically to the cylinder head 12. In FIG. 10, the cylinder head 12 to which the other end of the boss portion 30 is connected is indicated by a dotted line.

An upper part of the boss part 30 is provided with a penetration hole 30a through which a screw or bolt 20C (see FIG. 5) is inserted and the boss part 30 is fixed to the cylinder head 12 by the screw 20C. A lower part of the boss part 30 is connected to the oil passage part 25 and a front surface of the boss part 30 is connected to the peripheral part of the mounting fixing part 22.

In Figures 7 and 9, the boss portion 30 is provided with a lubricating oil passage 30b. The lubricating oil passage 30b communicates with the oil passage 25a and oil flowing through the oil passage 25a is introduced into the lubricating oil passage 30b in an oil passage (not shown ) formed in the motor body 7. Oil introduced from the lubricating oil passage 30b into the oil passage of the motor body 7 is supplied to a lubricating part of the motor body 7.

The boss portion 30 is provided with outlet oil passages 30c and 30d and the outlet oil passages 30c and 30d are provided between the penetration hole 30a and the lubricating oil passage 30b in up-down direction. The outlet oil passage 30c communicates with the cylinder part 27 and the oil supplied from the oil passage 25a to the cylinder part 27 through the oil passage 19g is supplied from the oil passage outlet 30c to the advance chamber of the variable valve timing mechanism on the exhaust side 53.

The outlet oil passage 30d communicates with the cylinder part 27 and the oil supplied from the oil passage 25a to the cylinder part 27 through the oil passage 19g is supplied from the passage outlet oil 30d to the delay chamber of the exhaust valve variable valve mechanism 53.

When the slide valve 28A is driven by the control device 28B, the hydraulic control valve 28 supplies oil supplied to the cylinder part 27 via the oil passages 24a and 25a to the chamber. advance or delay chamber of the exhaust side variable valve mechanism 53 via the outlet oil passage 30c or the outlet oil passage 30d. In other words, the hydraulic control valve 28 switches an oil supply path to a path in which oil flows from the cylinder part 27 to the advance chamber and a path in which oil flows from the cylinder part 27 to the delay chamber.

In Figure 7, the connecting wall 19 is provided with drainage oil passages 35a and 35b and the drainage oil passages 35a and 35b return the oil returned from the advance chamber or from the chamber delay of the exhaust valve variable valve mechanism 53 to the cylinder part 27 from the cylinder part 27 to a space 54 (see FIG. 10) between the chain cover 18 and the engine body 7. The oil returned in space 54 is stored in the oil pan 14.

The drainage oil passages 35a and 35b are formed in the cylindrical parts 35A and 35B provided in the connecting wall 19. In FIG. 10, the cylindrical part 35A is a part which is formed in cylindrical shape by the cylinder part 27 and the connecting wall 19, and the cylindrical part 35B is also formed in cylindrical shape by the cylinder part 27 and the connecting wall 19 although this is not illustrated in the drawings. The cylindrical parts 35A and 35B of this embodiment constitute a third cylindrical part of the present invention.

As illustrated in Figure 7, the cylindrical parts 35A and 35B are connected to the oil passage part 25 at the side opposite to the boss part 30. In other words, the boss part 30 is provided in a upper side of the oil passage part 25 and the cylindrical parts 35A and 35B are provided in a lower side of the oil passage part 25. Consequently, the oil passage part 25 is sandwiched between the boss part 30 and the cylindrical parts 35A and 35B in the up-down direction.

In Figure 11, the connecting wall 19 is provided with a plate-shaped rib 19E and the rib 19E has a thickness equal to the diameter of the oil passage portion 25 (the diameter in the top direction- low). The cylinder part 27 is connected to the oil passage part 25 by the rib 19E.

In FIG. 9, the chain cover 18 is provided with a sensor boss part 31. A sensor 32 is adjusted to the sensor boss part 31 and the sensor boss part 32 supports the sensor 32. The sensor 32 detects a state of the oil flowing through the oil passages 24a and 25a, for example an oil temperature, an oil pressure, or an oil temperature and an oil pressure.

As described above, according to the engine cover structure 5 of this embodiment, the chain cover 18 comprises the cylinder part 27 which is swollen from the connecting wall 19 in the direction of the side opposite to the body motor 7 and which is provided at the lower side of the mounting fixing part 22 so that the slide valve 28A is inserted therein.

In addition, the chain cover 18 includes the oil passage portion 24 which is swollen from the connecting wall 19 towards the motor body 7 and extends in the up-down direction of the chain cover 18 and the oil passage part 25 which is swollen from the connecting wall 19 in the direction of the motor body 7 and is connected to the upper ends of the side walls 19A and 19B and of the oil passage part

24.

The oil passage 24a is formed inside the oil passage part 24 and the oil passage 25a is formed inside the oil passage 24a.

Consequently, since it is possible to increase the rigidity of the connecting wall in the periphery of the oil passage part 25 comprising the oil passage part 25 through the oil passage part 25, it is possible to prevent the vibration of the connecting wall 19 in the periphery of the oil passage part 25 comprising the oil passage part 25.

In addition, the cylinder part 27 comprises the wall part 27A connected to the wall part 25A of the oil passage part 25 and the cylinder part 27 extends along the passage part d oil 25.

Consequently, since the cylinder part 27 is connected to the oil passage part 25 having a high rigidity, it is possible to increase the rigidity of the cylinder part 27 and to prevent the cylinder part 27 to be vibrated. Consequently, since it is possible to reduce the vibration of the hydraulic control valve 28 attached to the chain cover 18, it is possible to improve the reliability of the hydraulic control valve 28.

In addition, according to the cover structure of this embodiment, the chain cover 18 comprises the boss part 30, one end of which is connected to the cylinder part 27 and the other end of which is connected to the engine body. 7. The boss part 30 includes the outlet oil passages 30c and 30d supplying oil from the hydraulic control valve 28 to the variable valve timing mechanism on the exhaust side 53 and is connected to the passage part of oil 25.

Consequently, since the cylinder part 27 is connected to the oil passage part 25 and to the boss part 30 having respectively a high rigidity, it is possible to further increase the rigidity of the cylinder part 27. For this reason, it is possible to more effectively prevent the cylinder part 27 from being vibrated. Consequently, since it is possible to more effectively reduce the vibration of the hydraulic control valve 28 attached to the chain cover 18, it is possible to further improve the reliability of the hydraulic control valve 28.

In addition, according to the cover structure of this embodiment, the connecting wall 19 is provided with cylindrical parts 35A and 35B comprising the drainage oil passages 35a and 35b discharging oil from the part of cylinder 27 towards the space 54 between the chain cover 18 and the engine body 7.

In addition, the cylindrical parts 35A and 35B are connected to the oil passage part 25 on the side opposite to the boss part 30.

Consequently, since it is possible to connect the oil passage part 25 to the cylindrical parts 35A and 35B having a high rigidity, it is possible to further increase the rigidity of the oil passage part 25 Then, since it is possible to connect the cylinder part 27 to the oil passage part 25 having a higher rigidity, it is possible to further increase the rigidity of the cylinder part 27.

For this reason, it is possible to more effectively prevent the cylinder part 27 from being vibrated. Consequently, since it is possible to more effectively reduce the vibration of the hydraulic control valve 28 attached to the chain cover 18, it is possible to further improve the reliability of the hydraulic control valve 28.

In addition, according to the cover structure of this embodiment, the cylinder part 27 is connected to the oil passage part 25 by the plate-shaped rib 19E having a thickness equal to the diameter of the part oil passage 25.

Consequently, it is possible to further increase the rigidity of the oil passage part 25 by connecting the rib 19E having a high rigidity to the oil passage part 25. Then, since it is possible to connect the cylinder part 27 to the oil passage part 25 having a higher rigidity, it is possible to further increase the rigidity of the cylinder part 27.

For this reason, it is possible to more effectively prevent the cylinder part 27 from being vibrated. Consequently, since it is possible to more effectively reduce the vibration of the hydraulic control valve 28 attached to the chain cover 18, it is possible to further improve the reliability of the hydraulic control valve 28.

In addition, the cover member of this embodiment is configured as a chain cover 18, but the present invention is not limited to the chain cover 18 provided that the cover member covers the part motor body end 7.

Although embodiments of this invention have been described, it is apparent that a person skilled in the art could have made changes without departing from the scope of this invention. It is intended that any such modification and all such equivalents be included in this invention.

List of reference signs - 2L Left side element (vehicle body),

- 2R Right side element (vehicle body),

- 3R Right anti-vibration mounting element (mounting element),

- 5 Engine (internal combustion engine),

- 7 motor body,

- 10 exhaust camshaft (camshaft),

- 1 la, 12a Right end part (end part of the motor body),

- 15 Crankshaft,

- 18 chain cover (cover element),

- 19 connecting wall,

- 19A, 19B Side wall,

- 19E rib (plate-shaped rib),

- 19g Oil passage (inlet oil passage),

- 22 mounting fixing part,

- 24 Oil passage part (first cylindrical part),

- 24a Oil passage (first oil passage, inlet oil passage),

- 25 Oil passage part (second cylindrical part),

- 25A Part of wall (part of wall of second cylindrical part),

- 25a Oil passage (second oil passage, inlet oil passage),

- 27 cylinder part,

- 27A Wall part (cylinder part wall part),

- 28 Hydraulic control valve,

- 28A Slide valve (valve part),

- 30 boss part,

- 30c, 30d Oil outlet passage,

- 35A, 35B Cylindrical part (third cylindrical part),

- 35a, 35b Drain oil passage,

- 53 Variable valve timing mechanism on the exhaust side (variable valve timing mechanism),

- 54 Space (space between cover element and motor body).

Claims (1)

[Claim 1] claims A cover structure of an internal combustion engine comprising: an engine body (7) comprising a crankshaft (15), a camshaft (10), and a variable valve timing mechanism (53) modifying a phase relative rotation of the camshaft (10) relative to the crankshaft (15); and a cover member (18) comprising a pair of side walls (19A, 19B) fixed to an end portion (11a, 12a) of the motor body (7), a connecting wall (19) provided between the pair side walls (19A, 19B) for covering the end part (11a, 12a) of the motor body (7) and connecting the pair of side walls, and a mounting fixing part (22) provided in an upper part the connecting wall (19) and provided so that a mounting element (3R) provided in a vehicle body (2L, 2R) is attached thereto; and a hydraulic control valve (28) including a valve portion (28A) and supplying hydraulic oil to the variable valve mechanism (53), wherein the cover member (18) includes a cylinder portion enlarged (27) enlarged from the enlarged connecting wall towards a side opposite the motor body (7) and provided in a lower side of the mounting fixing part (22) so that the valve part (28A ) is inserted therein, a first cylindrical part (24) swollen from the connecting wall in the direction of the motor body (7) and extending in the up-down direction of the cover element (18), a second cylindrical part (25) swollen from the connecting wall in the direction of the motor body (7) and connected to an upper end of the first cylindrical part (24) and to the pair of side walls (19a, 19b), and one entry oil passage (19g, 24a, 25a) provided nt oil at the swollen cylinder part (27), wherein the inlet oil passage (19g, 24a, 25a) comprises a first oil passage (24a) formed inside the first cylindrical part (24) and a second oil passage (25a) formed inside the second cylindrical part (25) and communicating with the first oil passage (24a) and the swollen cylinder part (27), and wherein the bulged cylinder portion (27) includes a wall portion (27A) connected to a wall portion (25A) of the second cylindrical portion (25) and extends along the second cylindrical portion (25) . [Claim 2] Cover structure of the internal combustion engine according to claim 1, wherein the cover member (18) comprises a boss portion having one end connected to the cylinder part (27) and the other end connected to the engine body (7), and wherein the boss portion has an outlet oil passage supplying oil from the hydraulic control valve (28) to the variable valve mechanism (53) and is connected to the second cylindrical portion (25). [Claim 3] Cover structure of the internal combustion engine according to claim 2, wherein the connecting wall (19) is provided with a third cylindrical part having a drainage oil passage discharging oil from the cylinder part (27) to a space between the cover member (18) and the motor body (7), and wherein the third cylindrical part is connected to the second cylindrical part (25) on a side opposite to the boss part. [Claim 4] Cover structure of the internal combustion engine according to any one of Claims 1 to 3, wherein the cylinder part (27) is connected to the second cylindrical part (25) by a plate-shaped rib having a thickness equal to a diameter of the second cylindrical part (25). 1/11