JP2023078649A - internal combustion engine - Google Patents

Abstract

To provide an internal combustion engine capable of improving rigidity of a region near a first solenoid valve mounting portion and a second solenoid valve mounting portion disposed between adjacent cylinder head fastening portions of an oil pump storage portion of a chain case, and preventing a load by vibration of the oil pump storage portion from acting on a first solenoid valve and a second solenoid valve.SOLUTION: An axis 23R of a storage hole 23A of a first solenoid valve mounting portion 23 and an axis 24R of a storage hole 24A of a second solenoid valve mounting portion 24 are disposed on different positions in an EF direction. The first solenoid valve mounting portion 23 and the second solenoid valve mounting portion 24 are at least partially overlapped in an AB direction. Fastening holes 41A, 42A of cylinder head fastening portions 41, 42 are formed outside of a projection region of projecting the storage hole 23A of the first solenoid valve mounting portion 23 to the fastening holes 41A, 42A side, and outside of a projection region of projecting the storage hole 24A of the second solenoid valve mounting portion 24 to the fastening hole 41A, 42A side.SELECTED DRAWING: Figure 3

Description

The present invention relates to internal combustion engines.

A solenoid valve unit for an internal combustion engine disclosed in Patent Document 1 includes a first solenoid valve that is provided on a cover arranged at an end of the internal combustion engine and that controls the amount of hydraulic oil supplied from a hydraulic source to a first hydraulic mechanism. , a second solenoid valve provided adjacent to the first solenoid valve on the cover and controlling the amount of hydraulic oil supplied from the hydraulic source to the second hydraulic mechanism; and the first solenoid valve and the second solenoid valve on the cover. and an oil filter provided between and connected to each solenoid valve to filter hydraulic oil supplied to each solenoid valve.

Japanese Patent No. 4613760

However, in the technique described in Patent Document 1, when two electromagnetic valve mounting portions each accommodating an electromagnetic valve are formed integrally with the chain case, a plurality of fastenings of the chain case for fastening to the cylinder head are required. In order to avoid interference in the casting direction between the cast pin that forms the bolt hole of the part and the cast pin that forms the accommodation hole of the solenoid valve mounting part in which the solenoid valve is accommodated, the distance between the fastening parts is increased. Because it is necessary to increase the length, the rigidity of the part near the solenoid valve mounting part located between the adjacent fastening parts of the chain case decreases, and the vibration load due to the reduced rigidity acts on the solenoid valve. There's a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances as described above. It is an object of the present invention to provide an internal combustion engine capable of improving the rigidity of a portion near an oil pump accommodating portion and suppressing the load due to vibration of an oil pump accommodating portion from acting on a first solenoid valve and a second solenoid valve. is.

The present invention comprises a variable valve timing mechanism around which a timing chain is wound, an electromagnetic valve for controlling hydraulic oil supplied to the variable valve timing mechanism, and a cylinder head covering the timing chain and the variable valve timing mechanism. a chain case fixed to the cylinder head; a cylinder head cover connected to the cylinder head; and an oil pan provided on the opposite side of the chain case from the cylinder head and connected to the cylinder head via a cylinder block. an intake port provided in the cylinder head for taking in air; and an exhaust port provided on the opposite side of the chain case to the intake port for discharging exhaust gas, wherein the variable valve timing mechanism is formed in the chain case, and the solenoid valve is arranged on the oil pan side of the chain case with respect to the bulging portion, wherein the direction of the cylinder head cover with respect to the chain case And the direction of the oil pan is the AB direction, the direction of the intake port and the exhaust port with respect to the chain case is the CD direction, and the outer direction and the inner direction of the chain case with respect to the chain case are the EF direction Then, the electromagnetic valve has a large diameter portion and a small diameter portion, has a first electromagnetic valve arranged on the intake port side in the CD direction, a large diameter portion and a small diameter portion, and has the CD The chain case includes an oil pump accommodating portion that accommodates an oil pump and an accommodating hole that accommodates at least the small diameter portion of the first electromagnetic valve. a first electromagnetic valve mounting portion integrally formed with the oil pump accommodating portion; and an accommodating hole for accommodating at least a small diameter portion of the second electromagnetic valve; integrally formed with the oil pump accommodating portion and a plurality of cylinder head fastening portions having fastening holes for fastening the oil pump housing portion to the cylinder head, wherein the housing holes of the first electromagnetic valve mounting portion and the The accommodation hole of the second electromagnetic valve mounting portion is disposed on one of the intake port side and the exhaust port side in the CD direction, and opens toward one of the intake port side and the exhaust port side. The axis of the receiving hole of the first electromagnetic valve mounting portion and the axis of the receiving hole of the second electromagnetic valve mounting portion are arranged at different positions in the EF direction, and the first electromagnetic valve mounting portion and the second electromagnetic valve At least a part of the mounting portion overlaps in the AB direction, and the fastening hole of the adjacent cylinder head fastening portion is a projection area of the accommodation hole of the first electromagnetic valve mounting portion projected on the fastening hole side. It is characterized in that it is formed on the outside and outside of a projection area in which the receiving hole of the second electromagnetic valve mounting portion is projected onto the fastening hole side.

As described above, according to the present invention, the rigidity of the portion in the vicinity of the first electromagnetic valve mounting portion and the second electromagnetic valve mounting portion provided between the adjacent cylinder head fastening portions of the oil pump accommodating portion of the chain case is reduced. It is possible to provide an internal combustion engine capable of suppressing the load due to the vibration of the oil pump accommodating portion from acting on the first solenoid valve and the second solenoid valve.

FIG. 1 is a front view of an internal combustion engine according to one embodiment of the invention. FIG. 2 is a side view of an internal combustion engine according to one embodiment of the invention. FIG. 3 is a perspective view of a chain case of an internal combustion engine according to one embodiment of the invention. FIG. 4 is a front view of a chain case of an internal combustion engine according to one embodiment of the invention. FIG. 5 is a side view of a chain case of an internal combustion engine according to one embodiment of the invention. 6 is a cross-sectional view taken along the line VI-VI in FIG. 4. FIG.

An internal combustion engine according to an embodiment of the present invention includes a variable valve timing mechanism around which a timing chain is wound, an electromagnetic valve that controls hydraulic oil supplied to the variable valve timing mechanism, a timing chain and the variable valve timing mechanism. a chain case fixed to the cylinder head so as to cover the cylinder head; a cylinder head cover connected to the cylinder head; An oil pan, an intake port provided in the cylinder head for taking in air, and an exhaust port provided on the opposite side of the chain case to the intake port for discharging exhaust gas, covering the variable valve timing mechanism. An internal combustion engine in which a bulging portion is formed in a chain case and an electromagnetic valve is arranged on the oil pan side of the chain case relative to the bulging portion, wherein the direction of the cylinder head cover and the direction of the oil pan with respect to the chain case are defined as AB directions. , where the direction of the intake port and the direction of the exhaust port with respect to the chain case is the CD direction, and the direction of the outside and the inside of the chain case with respect to the chain case is the EF direction, the solenoid valve has a large diameter portion and a small diameter portion. a first solenoid valve arranged on the intake port side in the CD direction; and a second solenoid valve having a large diameter portion and a small diameter portion and arranged on the exhaust port side in the CD direction. The case has an oil pump accommodating portion that accommodates the oil pump, an accommodating hole that accommodates at least the small-diameter portion of the first solenoid valve, a first solenoid valve mounting portion integrally formed with the oil pump accommodating portion, and a first solenoid valve mounting portion. It has a housing hole for housing at least the small-diameter portion of the two solenoid valves, a second solenoid valve mounting section integrally formed with the oil pump housing section, and a fastening hole for fastening the oil pump housing section to the cylinder head. a plurality of cylinder head fastening portions, the accommodation hole of the first solenoid valve attachment portion and the accommodation hole of the second solenoid valve attachment portion are disposed on either the intake port side or the exhaust port side in the CD direction, and The opening faces either the intake port side or the exhaust port side, and the axis of the accommodation hole of the first solenoid valve mounting portion and the axis of the accommodation hole of the second solenoid valve mounting portion are arranged at different positions in the EF direction, At least a part of the first electromagnetic valve mounting portion and the second electromagnetic valve mounting portion overlap in the AB direction, and the fastening holes of the adjacent cylinder head fastening portions overlap the housing holes of the first electromagnetic valve mounting portion. outside the projection area projected to the side and outside the projection area projected to the fastening hole side of the housing hole of the second solenoid valve mounting portion.

Thus, in the internal combustion engine according to the embodiment of the present invention, the vicinity of the first electromagnetic valve mounting portion and the second electromagnetic valve mounting portion provided between the adjacent cylinder head fastening portions of the oil pump accommodating portion of the chain case. The rigidity of the portion can be improved, and the load due to the vibration of the oil pump accommodating portion can be suppressed from acting on the first solenoid valve and the second solenoid valve.

An internal combustion engine according to one embodiment of the present invention will be described below with reference to the drawings. 1 to 6 are diagrams showing an internal combustion engine according to one embodiment of the present invention.

In FIGS. 1 to 6, the AB, CD, and EF directions are perpendicular to each other, and the internal combustion engine removed from the vehicle is erected with the cylinder head directly above the crankshaft. is based on. Further, in this embodiment, the EF direction coincides with the longitudinal direction of the vehicle equipped with the internal combustion engine.

First, the configuration will be explained. 1 and 2, an internal combustion engine 1 mounted on a vehicle has a cylinder block 2. As shown in FIG. A crankshaft 2A is provided in the cylinder block 2 and extends in the EF direction.

Three cylinders (not shown) arranged in the EF direction are formed in the cylinder block 2, and the cylinders extend in the AB direction. The internal combustion engine 1 of this embodiment is a longitudinally mounted FR (front engine/rear drive) engine. The internal combustion engine 1 is not limited to an in-line engine, and may be, for example, a V-type engine or the like, and the number of cylinders is not limited to three.

A cylinder head 3 is provided above the cylinder block 2 . The cylinder head 3 has an intake port 3A (see FIG. 2) for taking in air, an exhaust port 3B (see FIG. 1) for discharging exhaust gas, and an intake valve and an exhaust valve (not shown). The intake port 3A opens in the right side wall of the cylinder head 3, and the exhaust port 3B opens in the left side wall of the cylinder head 3. As shown in FIG.

A cylinder head cover 4 is installed above the cylinder head 3 . An oil pan 5 is installed below the cylinder block 2 , and oil for lubricating the internal combustion engine 1 is stored in the oil pan 5 .

The internal combustion engine 1 is installed below a floor panel of a vehicle (not shown). The cylinder block 2 is installed such that the center lines of the plurality of cylinders are inclined with respect to the vertical direction of the vehicle. Specifically, the cylinder block 2 is installed such that its center line is inclined in the lateral direction of the vehicle with respect to the vertical direction.

Under the internal combustion engine 1, an undercover 1A is provided. The undercover 1A extends horizontally and covers the internal combustion engine 1 from below. A bottom surface 5A of the oil pan 5 is positioned at the bottom of the internal combustion engine 1 in a vehicle-mounted state. The bottom surface 5A is inclined with respect to the left-right direction of the internal combustion engine 1 itself so as to extend parallel to the undercover 1A when mounted on the vehicle.

In this manner, the internal combustion engine 1 is mounted in the front portion of the vehicle in a greatly inclined posture. Therefore, when mounted in a vehicle, the right side (intake side) of the internal combustion engine 1 faces upward, and the left side (exhaust side) of the internal combustion engine 1 faces downward in the vehicle.

The internal combustion engine 1 includes a variable valve timing mechanism 11 around which a timing chain 10 is wound, and tubular first and second solenoid valves 15 and 15 serving as hydraulic control valves for controlling hydraulic fluid supplied to the variable valve timing mechanism 11 . A solenoid valve 16 and a cylinder head cover 4 connected to the cylinder head 3 are provided. The internal combustion engine 1 also includes a chain case 20 fixed to the cylinder head 3 so as to cover the timing chain 10 and the variable valve timing mechanism 11 . The variable valve timing mechanism 11 has an intake-side variable valve timing mechanism 12 arranged on the intake port 3A side and an exhaust-side variable valve timing mechanism 13 arranged on the exhaust port 3B side.

The internal combustion engine 1 includes an oil pan provided on the opposite side of the chain case to the cylinder head 3 and connected to the cylinder head 3 via the cylinder block 2, and an intake port provided in the cylinder head 3 for taking in air. 3A, and an exhaust port 3B provided on the opposite side of the chain case from the intake port 3A for discharging exhaust gas.

A chain case 20 is formed with a bulging portion 21 that covers the variable valve timing mechanism 11 . The bulging portion 21 bulges outward (forward) from the chain case 20 . The bulging portion 21 is formed at the end (upper end) of the chain case 20 on the cylinder head cover 4 side. The first solenoid valve 15 and the second solenoid valve 16 are arranged closer to the oil pan 5 than the bulging portion 21 of the chain case 20 .

The internal combustion engine 1 also includes an oil pump 6 around the crankshaft 2A for pumping the oil stored in the oil pan 5 to the parts requiring lubrication and the variable valve timing mechanism 11 .

Here, in this embodiment, the direction of the cylinder head cover and the direction of the oil pan with respect to the chain case 20 is defined as the AB direction, the direction of the intake port 3A and the direction of the exhaust port 3B with respect to the chain case 20 is defined as the CD direction, and the direction of the chain case 20 Let the outer direction and the inner direction be the EF direction.

The first electromagnetic valve 15 is arranged on the intake port 3A side in the CD direction. The first solenoid valve 15 has a large diameter portion 15A and a small diameter portion 15B. The second solenoid valve 16 is arranged on the exhaust port 3B side in the CD direction. The second solenoid valve 16 has a large diameter portion 16A and a small diameter portion 16B. A connector (not shown) for electrically controlling the first electromagnetic valve 15 and the second electromagnetic valve 16 is connected to the intake port 3A side in the CD direction of the large diameter portions 15A and 16A. The connection port of each connector faces the outside (forward) of the chain case 20 in the EF direction.

Here, since the internal combustion engine 1 of this embodiment is mounted on the vehicle in a greatly inclined posture, the uppermost parts of the first solenoid valve 15 and the second solenoid valve 16 mounted on the vehicle in the vertical direction of the vehicle are located on the cylinder head cover. 4 in the vertical direction of the vehicle. A connector (not shown) at the end of the second electromagnetic valve 16 on the side of the intake port 3A in the CD direction is connected to a connector (not shown) at the end of the first electromagnetic valve 15 on the side of the intake port 3A in the CD direction. and below the cylinder head cover 4 side.

As a result, the connector of the second solenoid valve 16 is located between the connector of the first solenoid valve 15 and the cylinder head cover 4 and below the uppermost parts of both the first solenoid valve 15 and the cylinder head cover 4 in the vertical direction of the vehicle. Since the second solenoid valve 16 is arranged on the side, dust collection to the connector of the second solenoid valve 16 can be suppressed without arranging the second solenoid valve 16 inside the cylinder head cover 4 .

The chain case 20 includes an oil pump accommodating portion 29 that accommodates the oil pump 6, a first electromagnetic valve mounting portion 23 that has an accommodating hole 23A (see FIG. 3) that accommodates at least the small diameter portion 15B of the first electromagnetic valve 15, and a second solenoid valve mounting portion 24 having a housing hole 24A (see FIG. 3) that houses at least the small diameter portion 16B of the second solenoid valve 16 . The first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 are formed integrally with the oil pump accommodating portion 29 .

Here, the oil pump accommodating portion 29 is a flat portion of the chain case 20 that does not protrude in the direction of the crankshaft 2A. The oil pump accommodating portion 29 is arranged below the bulging portion 21 and is continuous with the lower portion of the bulging portion 21 . Since the oil pump accommodating portion 29 does not have a bulging shape like the bulging portion 21 but has a flat shape, the rigidity thereof is inferior to that of the bulging portion 21 as it is. Therefore, in this embodiment, the rigidity of the portion of the oil pump accommodation portion 29 where the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 are provided is improved. Moreover, since it is preferable to arrange the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 compactly in the AB direction, the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 are arranged in the CD direction and the EF direction. They are placed in different directions.

The chain case 20 includes a plurality of cylinder head fastening portions 41 and 42, and the cylinder head fastening portions 41 and 42 have fastening holes 41A and 42A for fastening the oil pump accommodating portion 29 to the cylinder head 3, respectively. are doing. The cylinder head fastening portions 41 and 42 are adjacent to each other in the AB direction.

3 and 4, the receiving hole 23A of the first electromagnetic valve mounting portion 23 and the receiving hole 24A of the second electromagnetic valve mounting portion 24 are arranged on either the intake port 3A side or the exhaust port 3B side in the CD direction, Moreover, it is open facing either the intake port 3A side or the exhaust port 3B side. That is, the housing hole 23A of the first electromagnetic valve mounting portion 23 and the housing hole 24A of the second electromagnetic valve mounting portion 24 are arranged in the same direction in the CD direction, and are opened facing the same direction. In this embodiment, the housing hole 23A of the first electromagnetic valve mounting portion 23 and the housing hole 24A of the second electromagnetic valve mounting portion 24 are arranged on the intake port 3A side and open toward the intake port 3A side. there is

3 and 5, the axis 23R of the receiving hole 23A of the first electromagnetic valve mounting portion 23 and the axis 24R of the receiving hole 24A of the second electromagnetic valve mounting portion 24 are arranged at different positions in the EF direction. Specifically, the axis 23R is arranged inside the chain case 20 in the EF direction relative to the axis 24R. Note that the axis 23R and the axis 24R may be parallel. In this case, the direction of extraction of the cast-out pins forming the receiving holes 23A and 24A can be the same. In addition, the distance in the CD direction (the direction of the axes 23R and 24R) between the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 can be further shortened.

In FIG. 5, at least a portion of the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 overlap in the AB direction. Specifically, in the AB direction, the lower end portion 24L of the second electromagnetic valve mounting portion 24 is arranged between the upper end portion 23U and the lower end portion 23L of the first electromagnetic valve mounting portion 23, and the upper end of the second electromagnetic valve mounting portion 24 is arranged. An upper end portion 23U of the first electromagnetic valve mounting portion 23 is arranged between the portion 24U and the lower end portion 24L.

In FIG. 4, the fastening holes 41A and 42A of the adjacent cylinder head fastening portions 41 and 42 are outside the projection area of the housing hole 23A of the first electromagnetic valve mounting portion 23 projected toward the fastening holes 41A and 42A. It is formed outside the projection area where the receiving hole 24A of the two solenoid valve mounting portion 24 is projected toward the fastening holes 41A and 42A. Specifically, the fastening holes 41A and 42A of the cylinder head fastening portions 41 and 42 are formed by projecting the receiving holes 23A of the first electromagnetic valve mounting portion 23 onto the fastening holes 41A and 42A. is formed outside the region between Further, the fastening holes 41A and 42A of the cylinder head fastening portions 41 and 42 are defined by the upper end portion 24A1 and the lower end portion 24A2 of the projection area obtained by projecting the housing hole 24A of the second solenoid valve mounting portion 24 onto the fastening hole 41A and 42A side. formed outside the region between In this embodiment, in FIG. 4, the cylinder head fastening portion 41 is arranged above the upper end portion 24A1 of the projection area of the accommodation hole 24A of the second solenoid valve attachment portion 24, and the accommodation hole of the first solenoid valve attachment portion 23 A cylinder head fastening portion 42 is arranged below the lower end portion 23A2 of the projected area of 23A.

As shown in FIG. 5, in the EF direction, the inner end portion 24F of the chain case 20 of the accommodation hole 24A of the second solenoid valve attachment portion 24 is the same as that of the chain case 20 of the accommodation hole 23A of the first solenoid valve attachment portion 23. It is arranged outside the chain case 20 (to the right in FIG. 5) relative to the outer end 23E.

As shown in FIG. 4, in the CD direction, the end 24C of the accommodation hole 24A of the second solenoid valve mounting portion 24 on the side of the intake port 3A is the end portion 24C of the accommodation hole 23A of the first solenoid valve mounting portion 23 on the side of the exhaust port 3B. It is arranged closer to the exhaust port 3B than the end portion 23D.

3 and 6, the chain case 20 has a connecting portion 43. As shown in FIG. The connecting portion 43 extends in the EF direction, and connects the end portion of the first electromagnetic valve mounting portion 23 on the side of the exhaust port 3B in the CD direction and the end portion of the second electromagnetic valve mounting portion 24 on the side of the intake port 3A in the CD direction. is connected with Note that the connecting portion 43 also extends in the AB direction. Therefore, the connecting portion 43 connects the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 in the EF direction and the AB direction.

In FIG. 6, the chain case 20 has an oil gallery portion 27 extending in the CD direction, in which oil flows through an internal oil passage 27A, and an end portion of the bulging portion 21 on the oil pan 5 side in the AB direction (lower end in FIG. 6). ), and has a wall portion 21A extending in the EF direction and continuing to the oil pump accommodating portion 29 . The first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 are arranged between the oil gallery portion 27 and the wall portion 21A in the AB direction.

In order to suppress transmission of vibration of an intake manifold (not shown) connected to the intake port 3A of the cylinder head 3 to the chain case 20, it is preferable to improve the rigidity of a portion of the chain case 20 in the vicinity of the intake manifold. . Therefore, as shown in FIG. 3, the intake port 3A and the intake manifold connected to the intake port 3A are arranged between the cylinder head fastening portion 41 and the cylinder head fastening portion 42 in the AB direction. Also, a projection area obtained by projecting the housing hole 23A of the first electromagnetic valve mounting portion 23 toward the fastening holes 41A and 42A, and a projection area obtained by projecting the housing hole 24A of the second electromagnetic valve mounting portion 24 toward the fastening holes 41A and 42A. are arranged between the cylinder head fastening portion 41 and the cylinder head fastening portion 42 in the AB direction. By doing so, the distance between the cylinder head fastening portion 41 and the cylinder head fastening portion 42 can be minimized. Rigidity can be improved. In addition, vibration of the portions of the chain case 20 in the vicinity of the cylinder head fastening portions 41 and 42 can be suppressed.

As described above, in this embodiment, the internal combustion engine 1 has the large diameter portion 15A and the small diameter portion 15B, the first electromagnetic valve 15 arranged on the intake port 3A side in the CD direction, and the large diameter portion 16A. and a second solenoid valve 16 having a small diameter portion 16B and arranged on the side of the exhaust port 3B in the CD direction.

Further, the chain case 20 has an oil pump accommodation portion 29 that accommodates the oil pump 6 and an accommodation hole 23A that accommodates at least the small diameter portion 15B of the first electromagnetic valve 15, and is integrally formed with the oil pump accommodation portion 29. a first solenoid valve mounting portion 23, a second solenoid valve mounting portion 24 having a housing hole 24A for housing at least the small diameter portion 16B of the second solenoid valve 16, and integrally formed with the oil pump housing portion 29; A plurality of cylinder head fastening portions 41 and 42 having fastening holes 41A and 42A for fastening the oil pump accommodating portion 29 to the cylinder head 3 are provided.

Further, the housing hole 23A of the first electromagnetic valve mounting portion 23 and the housing hole 24A of the second electromagnetic valve mounting portion 24 are arranged on either the intake port 3A side or the exhaust port 3B side in the CD direction, and side or the exhaust port 3B side.

Further, the axis 23R of the housing hole 23A of the first electromagnetic valve mounting portion 23 and the axis 24R of the housing hole 24A of the second electromagnetic valve mounting portion 24 are arranged at different positions in the EF direction. At least a portion of the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 overlap in the AB direction. The fastening holes 41A and 42A of the adjacent cylinder head fastening portions 41 and 42 are outside the projection area of the accommodation hole 23A of the first solenoid valve attachment portion 23 projected toward the fastening holes 41A and 42A, and the second solenoid valve attachment It is formed outside the projected area of the accommodating hole 24A of the portion 24 projected onto the fastening holes 41A and 42A.

As a result, the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 can be arranged compactly in the AB direction, so that during the manufacturing process of manufacturing the chain case 20 by casting, it is possible to fasten the oil pump accommodating portion 29 to the cylinder head. The cast pins for forming the fastening holes 41A and 42A of the portions 41 and 42, and the cast pins for forming the receiving holes 23A and 24A of the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24, Interference during casting can be prevented. Also, the distance between the cylinder head fastening portions 41 and 42 can be reduced.

Therefore, it is possible to improve the rigidity of the portion in the vicinity of the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 between the cylinder head fastening portions 41 and 42 in the oil pump accommodating portion 29 . Therefore, the load due to vibration from the oil pump accommodating portion 29 to the first solenoid valve 15 and the second solenoid valve 16 can be suppressed.

As a result, the rigidity of the portion near the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 provided between the adjacent cylinder head fastening portions 41 and 42 of the oil pump accommodating portion 29 of the chain case 20 is improved. It is possible to suppress the load due to the vibration of the oil pump accommodating portion 29 from acting on the first solenoid valve 15 and the second solenoid valve 16 .

In this embodiment, in the EF direction, the inner end portion 24F of the chain case 20 of the accommodation hole 24A of the second solenoid valve attachment portion 24 is located at the chain case 20 of the accommodation hole 23A of the first solenoid valve attachment portion 23. It is arranged outside the chain case 20 relative to the outer end 23E. In the CD direction, an end portion 24C of the accommodation hole 24A of the second solenoid valve mounting portion 24 on the side of the intake port 3A is located higher than an end portion 23D of the accommodation hole 23A of the first solenoid valve mounting portion 23 on the side of the exhaust port 3B. It is arranged on the exhaust port 3B side.

As a result, the distance in the AB direction between the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 can be reduced, and the accommodation hole 23A of the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 can be separated from each other. 24 A of accommodation holes can be separated in a CD direction and an EF direction. Therefore, it is possible to suppress the occurrence of casting defects such as blowholes between the outer peripheral portion of the first electromagnetic valve mounting portion 23 and the outer peripheral portion of the second electromagnetic valve mounting portion 24 .

Therefore, it is possible to eliminate adverse effects on the precise control of the variable valve timing mechanism, and to reduce the space between the first solenoid valve 15 and the second solenoid valve 16 in the AB direction.

Therefore, the rigidity of the portion in the vicinity of the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 between the cylinder head fastening portions 41 and 42 in the oil pump accommodating portion 29 can be further improved. The load due to vibration from the oil pump accommodating portion 29 to the first solenoid valve 15 and the second solenoid valve 16 can be further suppressed.

In this embodiment, the chain case 20 includes the end portion of the first solenoid valve attachment portion 23 on the side of the exhaust port 3B in the CD direction and the end portion of the second solenoid valve attachment portion 24 on the side of the intake port 3A in the CD direction. , and the connecting portion 43 extends in the EF direction.

As a result, the connecting portion 43 connects the end portion of the first electromagnetic valve mounting portion 23 on the side of the exhaust port 3B and the end portion of the second electromagnetic valve mounting portion 24 on the side of the intake port 3A. Vibration between the portion 23 and the second solenoid valve mounting portion 24, particularly in the AB direction, can be damped by the connecting portion 43. As shown in FIG. Therefore, especially in the AB direction, it is possible to suppress the vibration of one of the first solenoid valve 15 and the second solenoid valve 16 from acting on the other. Therefore, the first solenoid valve 15 and the second solenoid valve 16 can be protected from adverse effects due to transmission of vibration.

In this embodiment, the chain case 20 extends in the CD direction and is provided at an oil gallery portion 27 through which oil flows, and at the end of the bulging portion 21 on the oil pan 5 side in the AB direction. and a wall portion 21</b>A that extends upward and continues to the oil pump accommodating portion 29 . The first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 are arranged between the oil gallery portion 27 and the wall portion 21A in the AB direction.

As a result, the distance between the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 can be minimized, and the distance in the AB direction between the variable valve timing mechanism 11 and the oil gallery portion 27 can be minimized. As a result, the responsiveness and control accuracy of the variable valve timing mechanism 11 can be improved. In addition, since the length of the oil path from the oil gallery portion 27 to the variable valve timing mechanism 11 can be minimized, the amount of oil required to flow through the first electromagnetic valve mounting portion 23 and the second electromagnetic valve mounting portion 24 can be reduced. The weight of the internal combustion engine 1 and the vehicle can be reduced.

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.

1... internal combustion engine, 2... cylinder block, 3... cylinder head, 3A... intake port, 3B... exhaust port, 4... cylinder head cover, 5... oil pan, 10 ... timing chain, 11... variable valve timing mechanism, 15... first solenoid valve, 15A... large diameter portion, 15B... small diameter portion, 16... second solenoid valve, 16A. ..large diameter portion 16B...small diameter portion 20...chain case 21...swelling portion 21A...wall portion 23...first solenoid valve mounting portion 23A... Accommodating hole, 23R... Axis, 24... Second electromagnetic valve mounting portion, 24A... Accommodating hole, 24R... Axis, 27... Oil gallery portion, 29... Oil pump accommodating portion, 41, 42... Cylinder head fastening portion, 41A, 42A... Fastening hole, 43... Connecting portion

Claims (4)

a variable valve timing mechanism around which a timing chain is wound;
a solenoid valve that controls hydraulic oil supplied to the variable valve timing mechanism;
a chain case fixed to the cylinder head so as to cover the timing chain and the variable valve timing mechanism;
a cylinder head cover connected to the cylinder head;
an oil pan provided on the opposite side of the chain case from the cylinder head and connected to the cylinder head via a cylinder block;
an intake port provided in the cylinder head for taking in air;
an exhaust port provided on the opposite side of the chain case from the intake port for discharging exhaust gas,
a bulging portion covering the variable valve timing mechanism is formed in the chain case;
An internal combustion engine in which the solenoid valve is disposed closer to the oil pan than the bulging portion of the chain case,
The direction of the cylinder head cover and the direction of the oil pan with respect to the chain case are defined as AB directions,
The direction of the intake port and the direction of the exhaust port with respect to the chain case are CD directions,
When the outer direction and the inner direction of the chain case with respect to the chain case are defined as the EF direction,
The electromagnetic valve has a large-diameter portion and a small-diameter portion, has a first electromagnetic valve arranged on the intake port side in the CD direction, a large-diameter portion and a small-diameter portion, and has a large-diameter portion and a small-diameter portion. and a second solenoid valve arranged on the exhaust port side,
The chain case is
an oil pump accommodating portion that accommodates an oil pump;
a first solenoid valve mounting portion having a housing hole for housing at least the small diameter portion of the first solenoid valve and formed integrally with the oil pump housing portion;
a second solenoid valve mounting portion having a housing hole for housing at least the small diameter portion of the second solenoid valve and formed integrally with the oil pump housing portion;
a plurality of cylinder head fastening portions having fastening holes for fastening the oil pump accommodating portion to the cylinder head,
The receiving hole of the first electromagnetic valve mounting portion and the receiving hole of the second electromagnetic valve mounting portion are arranged on either the intake port side or the exhaust port side in the CD direction, and Open toward one side of the exhaust port side,
the axis of the housing hole of the first electromagnetic valve mounting portion and the axis of the housing hole of the second electromagnetic valve mounting portion are arranged at different positions in the EF direction,
At least a portion of the first electromagnetic valve mounting portion and the second electromagnetic valve mounting portion overlap in the AB direction,
The fastening holes of the adjacent cylinder head fastening portions are outside the projection area of the housing holes of the first electromagnetic valve mounting portion projected onto the fastening hole side, and the fastening holes of the second electromagnetic valve mounting portion are located outside the projection area. An internal combustion engine characterized in that it is formed outside a projection area projected on the hole side. In the EF direction, the inner end of the chain case of the receiving hole of the second solenoid valve mounting portion is located further along the chain than the outer end of the chain case of the receiving hole of the first solenoid valve mounting portion. placed outside the case,
In the CD direction, the end of the accommodation hole of the second electromagnetic valve mounting portion on the intake port side is closer to the exhaust port than the end of the accommodation hole of the first electromagnetic valve mounting portion on the exhaust port side. 2. Internal combustion engine according to claim 1, characterized in that it is arranged. The chain case is
a connecting portion that connects an end portion of the first electromagnetic valve mounting portion on the exhaust port side in the CD direction and an end portion of the second electromagnetic valve mounting portion on the intake port side in the CD direction,
3. The internal combustion engine according to claim 1, wherein said connecting portion extends in said EF direction. The chain case is
an oil gallery portion extending in the CD direction and through which oil flows;
a wall portion provided at an end portion of the bulging portion on the oil pan side in the AB direction, extending in the EF direction and continuing to the oil pump accommodating portion;
The first electromagnetic valve mounting portion and the second electromagnetic valve mounting portion are arranged between the oil gallery portion and the wall portion in the AB direction. The internal combustion engine according to any one of claims 1 to 3.

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