EP4187068A1 - Internal combustion engine - Google Patents
Internal combustion engine Download PDFInfo
- Publication number
- EP4187068A1 EP4187068A1 EP22207278.7A EP22207278A EP4187068A1 EP 4187068 A1 EP4187068 A1 EP 4187068A1 EP 22207278 A EP22207278 A EP 22207278A EP 4187068 A1 EP4187068 A1 EP 4187068A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder portion
- axial direction
- end portion
- side cylinder
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/022—Chain drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0043—Arrangements of mechanical drive elements
- F02F7/0046—Shape of casings adapted to facilitate fitting or dismantling of engine parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
- F01L2001/3443—Solenoid driven oil control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
- F01L2001/34433—Location oil control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34436—Features or method for avoiding malfunction due to foreign matters in oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34436—Features or method for avoiding malfunction due to foreign matters in oil
- F01L2001/3444—Oil filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
- F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
- F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
Definitions
- This invention relates to an internal combustion engine.
- JP 2006-118497 A describes an arrangement structure of a solenoid valve including a first solenoid valve which controls hydraulic oil supplied to an intake valve phase changing means for changing a rotation phase of an intake valve cam shaft and a second solenoid valve which controls hydraulic oil supplied to an exhaust valve phase changing means for changing a rotation phase of an exhaust valve cam shaft.
- the first solenoid valve and the second solenoid valve are provided in a timing chain cover disposed at an end portion of an engine.
- This invention has been made in view of the above-described circumstances and an object of this invention is to provide an internal combustion engine capable of protecting a portion of a hydraulic control valve exposed to the outside from foreign matter such as flying stones flying from below.
- an internal combustion engine including: a variable valve timing mechanism configured by winding a timing chain thereon; a hydraulic control valve controlling hydraulic oil supplied to the variable valve timing mechanism; and a chain casing fixed to a cylinder head to cover the timing chain and the variable valve timing mechanism, wherein the chain casing includes a bulging portion bulging in a crank shaft direction and covering the variable valve timing mechanism and a cylindrical cylinder portion attaching the hydraulic control valve thereto, wherein the hydraulic control valve includes a small diameter portion inserted from one end portion of the cylinder portion in an axial direction to the cylinder portion and a large diameter portion exposed from one end portion of the cylinder portion in the axial direction, wherein the internal combustion engine is mounted on a vehicle so that center lines of a plurality of cylinders are inclined with respect to an up to down direction of the vehicle, wherein the cylinder portion is adjacently formed below the bulging portion, wherein the other end portion of the cylinder portion in the axial direction is disposed below one end portion of the cylinder portion
- An internal combustion engine is an internal combustion engine including: a variable valve timing mechanism configured by winding a timing chain thereon; a hydraulic control valve controlling hydraulic oil supplied to the variable valve timing mechanism; and a chain casing fixed to a cylinder head to cover the timing chain and the variable valve timing mechanism, wherein the chain casing includes a bulging portion bulging in a crank shaft direction and covering the variable valve timing mechanism and a cylindrical cylinder portion attaching the hydraulic control valve thereto, wherein the hydraulic control valve includes a small diameter portion inserted from one end portion of the cylinder portion in an axial direction to the cylinder portion and a large diameter portion exposed from one end portion of the cylinder portion in the axial direction, wherein the internal combustion engine is mounted on a vehicle so that center lines of a plurality of cylinders are inclined with respect to an up to down direction of the vehicle, wherein the cylinder portion is adjacently formed below the bulging portion, wherein the other end portion of the cylinder portion in the axial direction is disposed below one end portion of the
- the internal combustion engine according to an embodiment of this invention can protect a portion exposed to the outside of the hydraulic control valve from foreign matter such as flying stones flying from below.
- FIGs. 1 to 4 are diagrams showing the internal combustion engine according to an embodiment of this invention.
- the display in the up, down, front, rear, right, and left directions shows the up, down, front, rear, right, and left when mounted on the vehicle.
- the display of the AB direction, the CD direction, and the EF direction is based on the case in which the internal combustion engine separated from the vehicle is upright so that the cylinder head is located right above the crank shaft.
- the AB direction, the CD direction, and the EF direction are directions orthogonal to each other and the EF direction coincides with the front to rear direction of the vehicle equipped with the internal combustion engine.
- an internal combustion engine 1 mounted on the vehicle includes a cylinder block 2.
- the cylinder block 2 is provided with a crank shaft 2A and the crank shaft 2A extends in the EF direction.
- the cylinder block 2 is provided with three cylinders (not shown) arranged in the EF direction and the cylinder extends in the AB direction.
- the internal combustion engine 1 of this embodiment is an FR (front engine-rear drive) type vertical engine. Additionally, the internal combustion engine 1 is not limited to an in-line engine and may be, for example, a V-type engine. Then, the number of cylinders is not limited to three.
- a cylinder head 3 is provided at the end portion of the cylinder block 2 in the A direction.
- the cylinder head 3 includes an intake port (not shown) which takes air, an exhaust port 3B which discharges an exhaust gas, an intake valve, and an exhaust valve (not shown).
- the exhaust port 3B opens to a side wall of the cylinder head 3 in the D direction.
- the intake port opens to a side wall of the cylinder head 3 in the C direction.
- a cylinder head cover 4 is installed at the end portion of the cylinder head 3 in the A direction.
- An oil pan 5 is installed at the end portion of the cylinder block 2 in the B direction and the oil pan 5 stores lubricating oil of the internal combustion engine 1.
- the internal combustion engine 1 is installed below a floor panel of a driver seat on the front part of the vehicle (not shown).
- the vehicle equipped with the internal combustion engine 1 is a so-called cab-over type vehicle in which a driver seat is disposed above the internal combustion engine 1.
- the internal combustion engine 1 is installed in the vehicle so that the center line C of the cylinder is inclined in the left to right direction with respect to the up to down direction of the vehicle.
- An undercover 1A is provided below the internal combustion engine 1.
- the undercover 1A extends in the horizontal direction and covers the internal combustion engine 1 from below.
- a bottom surface 5A of the oil pan 5 is located at the bottom portion of the internal combustion engine 1 in a vehicle mounted state. This bottom surface 5A is inclined with respect to the left to right direction of the internal combustion engine 1 itself to extend in parallel to the undercover lAin the vehicle mounted state.
- the internal combustion engine 1 is mounted on the front part of the vehicle in a largely inclined posture. Therefore, in the vehicle mounted state, the side surface (intake side) of the internal combustion engine 1 in the C direction faces the upper side of the vehicle and the side surface (exhaust side) of the internal combustion engine 1 in the D direction faces the lower side of the vehicle.
- the internal combustion engine 1 includes a variable valve timing mechanism 11 on which a timing chain 10 is wound and the cylinder head cover 4 which is connected to the cylinder head 3. Further, the internal combustion engine 1 includes an intake hydraulic control valve 15 and an exhaust hydraulic control valve 16 each having a cylindrical shape and serving as an intake hydraulic control valve controlling hydraulic oil supplied to the variable valve timing mechanism 11.
- the internal combustion engine 1 includes a chain casing 20 and this chain casing 20 is fixed to the side surface of the cylinder head 3.
- the chain casing 20 covers the timing chain 10 and the variable valve timing mechanism 11.
- the variable valve timing mechanism 11 includes an intake side variable valve timing mechanism 12 which is disposed on the side of the intake port and an exhaust side variable valve timing mechanism 13 which is disposed on the side of the exhaust port 3B.
- the internal combustion engine 1 includes an oil pan 5 which is provided on the side opposite to the cylinder head 3 with respect to the chain casing and is connected to the cylinder head 3 through the cylinder block 2, an intake port which is provided in the cylinder head 3 and takes air, and an exhaust port 3B which is provided on the side opposite to the intake port with respect to the chain casing and discharges an exhaust gas.
- the chain casing 20 is provided with a bulging portion 21 which covers the variable valve timing mechanism 11.
- the bulging portion 21 bulges in the crank shaft direction.
- the crank shaft direction is the axial direction of the crank shaft 2A.
- the bulging portion 21 bulges toward the outside of the chain casing 20 (the front side in the vehicle mounted state).
- the bulging portion 21 is formed at the end portion on the side of the cylinder head cover 4 (the end portion in the A direction) of the chain casing 20.
- the intake hydraulic control valve 15 and the exhaust hydraulic control valve 16 are arranged closer to the oil pan 5 than the bulging portion 21 of the chain casing 20.
- the internal combustion engine 1 includes an oil pump 6 and the oil pump 6 pressure-feeds oil stored in the oil pan 5 to a lubrication required portion and the variable valve timing mechanism 11.
- the oil pump 6 is provided around the crank shaft 2A.
- the direction of the cylinder head cover 4 with respect to the chain casing 20 and the direction of the oil pan 5 are defined as the AB direction
- the direction of the intake port with respect to the chain casing 20 and the direction of the exhaust port 3B are defined as the CD direction
- the outward direction of the chain casing 20 (the front side in the vehicle mounted state) and the inward direction (the rear side in the vehicle mounted state) are defined as the EF direction.
- the intake hydraulic control valve 15 is disposed on the side of the intake port in the CD direction.
- the exhaust hydraulic control valve 16 is disposed on the side of the exhaust port 3B in the CD direction.
- the chain casing 20 is provided with a cylindrical intake side cylinder portion 23 to which the intake hydraulic control valve 15 is attached and a cylindrical exhaust side cylinder portion 24 to which the exhaust hydraulic control valve 16 is attached.
- the intake side cylinder portion 23 and the exhaust side cylinder portion 24 extend in the CD direction.
- the exhaust side cylinder portion 24 constitutes the cylinder portion and the first cylinder portion of this invention.
- the intake side cylinder portion 23 constitutes the second cylinder portion of this invention.
- the intake side cylinder portion 23 and the exhaust side cylinder portion 24 are adjacently formed below the bulging portion 21.
- the other end portion 23D (the end portion in the D direction. See Fig. 4 ) of the intake side cylinder portion 23 in the axial direction is disposed below one end portion 23C of the intake side cylinder portion 23 in the axial direction (the end portion in the C direction. See Fig. 4 ).
- the other end portion 24D of the exhaust side cylinder portion 24 in the axial direction (the end portion in the D direction. See Fig. 4 ) is disposed below one end portion 24C of the exhaust side cylinder portion 24 in the axial direction (the end portion in the C direction. See Fig. 4 ).
- the intake hydraulic control valve 15 includes a small diameter portion 15B (see Fig. 1 ) which is inserted from one end portion 23C of the intake side cylinder portion 23 in the axial direction (see Fig. 4 ) into the intake side cylinder portion 23 and a large diameter portion 15A (see Fig. 1 ) which is exposed from one end portion 23C of the intake side cylinder portion 23 in the axial direction (see Fig. 4 ).
- the exhaust hydraulic control valve 16 includes a small diameter portion 16B (see Fig. 1 ) which is inserted from one end portion 24C of the exhaust side cylinder portion 24 in the axial direction (see Fig. 4 ) into the exhaust side cylinder portion 24 and a large diameter portion 16A (see Fig. 1 ) which is exposed from one end portion 24C of the exhaust side cylinder portion 24 in the axial direction (see Fig. 4 ).
- the intake side cylinder portion 23 is provided with an accommodation hole 23A accommodating the small diameter portion 15B of the intake hydraulic control valve 15.
- the exhaust side cylinder portion 24 is provided with an accommodation hole 24A accommodating the small diameter portion 16B of the exhaust hydraulic control valve 16.
- the chain casing 20 is provided with an oil pump accommodation portion 29 which accommodates the oil pump 6.
- the intake side cylinder portion 23, the exhaust side cylinder portion 24, and the oil pump accommodation portion 29 are integrally formed with each other.
- the oil pump accommodation portion 29 is a flat portion which does not bulge in the direction of the crank shaft in the chain casing 20.
- the oil pump accommodation portion 29 is disposed below the bulging portion 21 and is continuous to the lower portion of the bulging portion 21.
- the rigidity thereof is inferior to that of the bulging portion 21 as it is.
- the rigidity of the portion provided with the intake side cylinder portion 23 and the exhaust side cylinder portion 24 of the oil pump accommodation portion 29 is improved.
- the intake side cylinder portion 23 and the exhaust side cylinder portion 24 are arranged to be offset in the CD direction and the EF direction.
- a connector (not shown) for electrically controlling the intake hydraulic control valve 15 and the exhaust hydraulic control valve 16 is connected to the side of the intake port of the large diameter portions 15A and 16A in the CD direction.
- a connection port of each connector faces the outside (front side) of the chain casing 20 in the EF direction.
- the uppermost portions of the intake hydraulic control valve 15 and the exhaust hydraulic control valve 16 in the up to down direction of the vehicle are located below the uppermost portion of the cylinder head cover 4 in the up to down direction of the vehicle in the vehicle mounted state.
- a connector (not shown) of the end portion on the side of the intake port of the large diameter portion 16A of the exhaust hydraulic control valve 16 in the CD direction is disposed at a position which is on the lower side in the up to down direction of the vehicle and on the side of the cylinder head cover 4 with respect to a connector (not shown) of the end portion on the side of the intake port of the large diameter portion 15A of the intake hydraulic control valve 15 in the CD direction.
- the connector of the large diameter portion 16A of the exhaust hydraulic control valve 16 is disposed between the connector of the large diameter portion 15A of the intake hydraulic control valve 15 and the cylinder head cover 4 and below the uppermost portions of both the intake hydraulic control valve 15 and the cylinder head cover 4 in the up to down direction of the vehicle. Therefore, it is possible to suppress foreign matter such as dust from settling and accumulating on the connector of the large diameter portion 16A of the exhaust hydraulic control valve 16 without disposing the exhaust hydraulic control valve 16 inside the cylinder head cover 4.
- the intake hydraulic control valve 15 and the exhaust hydraulic control valve 16 are respectively inserted in the D direction from the end portions of the intake side cylinder portion 23 and the exhaust side cylinder portion 24 in the C direction (the upper side in the vehicle mounted state). Therefore, since the insertion directions of the intake hydraulic control valve 15 and the exhaust hydraulic control valve 16 are the same as each other, the insertion work can be facilitated.
- the intake hydraulic control valve 15 is disposed above the intake side cylinder portion 23 and the exhaust hydraulic control valve 16 is disposed above the exhaust side cylinder portion 24 in the vehicle mounted state, it is possible to prevent a foreign mater from entering the intake hydraulic control valve 15 and the exhaust hydraulic control valve 16 even when the foreign matter or the like mixed with the hydraulic oil precipitates.
- the edge portion of the chain casing 20 is provided with a plurality of cylinder head fastening portions 41 and 42 and the cylinder head fastening portions 41 and 42 respectively include fastening holes 41A and 42A for fastening the oil pump accommodation portion 29 to the cylinder head 3.
- the cylinder head fastening portions 41 and 42 are adjacent to each other in the AB direction.
- the portion provided with the cylinder head fastening portions 41 and 42 of the chain casing 20 is a portion having a large wall thickness and high strength.
- the accommodation hole 23A of the intake side cylinder portion 23 and the accommodation hole 24A of the exhaust side cylinder portion 24 are arranged on either the side of the intake port or the side of the exhaust port 3B in the CD direction and open to either the side of the intake port or the side of the exhaust port 3B. That is, the accommodation hole 23A of the intake side cylinder portion 23 and the accommodation hole 24A of the exhaust side cylinder portion 24 are arranged in the same direction in the CD direction and open in the same direction. In this embodiment, the accommodation hole 23A of the intake side cylinder portion 23 and the accommodation hole 24A of the exhaust side cylinder portion 24 are arranged on the side of the intake port and open to the side of the intake port.
- an axis 23R of the accommodation hole 23A of the intake side cylinder portion 23 and an axis 24R of the accommodation hole 24A of the exhaust side cylinder portion 24 are arranged at different positions in the EF direction.
- the axis 23R is disposed on the inside of the chain casing 20 in relation to the axis 24R in the EF direction.
- the axis 23R and the axis 24R are parallel to each other. Accordingly, since the casting pins forming the accommodation holes 23A and 24A can be extracted in the same direction, it is possible to manufacture the chain casing 20 from a simple mold structure and to further shorten the distance between the intake side cylinder portion 23 and the exhaust side cylinder portion 24 in the CD direction (the direction of the axes 23R and 24R).
- the chain casing 20 includes a wall-shaped connection portion 43.
- the connection portion 43 extends in the EF direction and connects the end portion on the side of the exhaust port 3B (the other end portion 23D shown in Fig. 4 ) of the intake side cylinder portion 23 in the CD direction to the end portion on the side of the intake port (one end portion 24C shown in Fig. 4 ) of the exhaust side cylinder portion 24 in the CD direction. Additionally, the connection portion 43 also extends in the AB direction. Thus, the connection portion 43 connects the intake side cylinder portion 23 and the exhaust side cylinder portion 24 in the EF direction and the AB direction.
- the chain casing 20 includes a cylindrical oil gallery portion 27 and an oil passage (not shown) through which hydraulic oil flows is formed inside the oil gallery portion 27.
- the oil gallery portion 27 extends in the CD direction.
- the chain casing 20 includes a wall portion 21A extending in the EF direction and continuous to the oil pump accommodation portion 29 and this wall portion 21A is provided at the end portion on the side of the oil pan 5 in the bulging portion 21 in the AB direction.
- the intake side cylinder portion 23 and the exhaust side cylinder portion 24 are arranged between the oil gallery portion 27 and the wall portion 21A in the AB direction.
- the intake port and the intake manifold connected to the intake port are arranged between the cylinder head fastening portion 41 and the cylinder head fastening portion 42 in the AB direction. Accordingly, since it is possible to set the distance between the cylinder head fastening portion 41 and the cylinder head fastening portion 42 to a minimum distance, it is possible to improve the rigidity of the portion in the vicinity of the cylinder head fastening portions 41 and 42 in the chain casing 20. Further, it is possible to suppress the vibration of the portion in the vicinity of the cylinder head fastening portions 41 and 42 in the chain casing 20.
- the chain casing 20 includes an intake side fastening boss portion 25 and an exhaust side fastening boss portion 26 for attaching the chain casing 20 to the cylinder head 3.
- the intake side fastening boss portion 25 and the exhaust side fastening boss portion 26 are arranged in the vicinity of the bulging portion 21 in the B direction.
- the end portion of the bulging portion 21 in the B direction is connected to the end portions of the intake side cylinder portion 23 and the exhaust side cylinder portion 24 in the A direction.
- the end portion of the intake side fastening boss portion 25 in the A direction is connected to the end portion of the intake side cylinder portion 23 in the B direction.
- the end portion of the exhaust side fastening boss portion 26 in the A direction is connected to the end portion of the exhaust side cylinder portion 24 in the B direction.
- the end surface of the cylinder head 3 in the A direction forms a planar joint surface extending in the CD direction and the EF direction and is joined to the cylinder head cover 4.
- the intake hydraulic control valve 15, the exhaust hydraulic control valve 16, the intake side cylinder portion 23, and the exhaust side cylinder portion 24 extend in the CD direction. Further, the intake hydraulic control valve 15 and the intake side cylinder portion 23 are arranged side by side in the EF direction with respect to the exhaust hydraulic control valve 16 and the exhaust side cylinder portion 24.
- the intake side fastening boss portion 25 and the exhaust side fastening boss portion 26 are arranged side by side in the CD direction.
- the intake side fastening boss portion 25 and the exhaust side fastening boss portion 26 are formed to protrude in the E direction (forward in the vehicle mounted state) in relation to the intake side cylinder portion 23.
- the intake side cylinder portion 23 and the exhaust side cylinder portion 24 are arranged side by side at different positions in the crank shaft direction.
- the intake side cylinder portion 23 and the exhaust side cylinder portion 24 are arranged in parallel in the crank shaft direction so that a part thereof overlaps in the crank shaft direction.
- the exhaust side cylinder portion 24 is disposed adjacent to the front side of the intake side cylinder portion 23.
- the exhaust side cylinder portion 24 is disposed to be offset to the exhaust side (the D direction) in relation to the intake side cylinder portion 23.
- the exhaust side cylinder portion 24 is disposed adjacently to the side of the D direction of the intake side cylinder portion 23.
- the exhaust side cylinder portion 24 is adjacently disposed in the E direction and the D direction of the intake side cylinder portion 23.
- the intake side cylinder portion 23 is adjacently formed above the exhaust side cylinder portion 24 to be parallel to the axial direction of the exhaust side cylinder portion 24 and to be located at a position different from the exhaust side cylinder portion 24 in the axial direction.
- the oil gallery portion 27 extends in a direction orthogonal to the crank shaft direction through the end portion of the intake side fastening boss portion 25 in the B direction and the end portion of the exhaust side fastening boss portion 26 in the B direction.
- the oil gallery portion 27 is connected to the end portion of the intake side fastening boss portion 25 in the B direction and the end portion of the exhaust side fastening boss portion 26 in the B direction.
- the chain casing 20 includes a reinforcement rib 28 formed below the intake side cylinder portion 23.
- the reinforcement rib 28 extends in the axial direction of the intake side cylinder portion 23.
- the reinforcement rib 28 connects the intake side cylinder portion 23, the exhaust side cylinder portion 24, and the intake side fastening boss portion 25.
- the reinforcement rib 28 extends in the axial direction of the exhaust side cylinder portion 24 from one end portion 24C of the exhaust side cylinder portion 24 in the axial direction to at least a position above the large diameter portion along the end portion on the side opposite to the bulging portion 21 (the end portion in the B direction) in the exhaust side cylinder portion 24.
- the reinforcement rib 28 connects one end portion 24C of the exhaust side cylinder portion 24 in the axial direction to one end portion 23C of the intake side cylinder portion 23 in the axial direction.
- the reinforcement rib 28 extends to one end portion 23C of the intake side cylinder portion 23 in the axial direction and connects one end portion 24C of the exhaust side cylinder portion 24 to a boss portion 34 formed at one end portion 23C of the intake side cylinder portion 23.
- the chain casing 20 includes the boss portion 34 formed at the end portion of the intake side cylinder portion 23 in the C direction and the B direction.
- the boss portion 34 is provided in the B direction of the bulging portion 21.
- a leg portion 15C of the intake hydraulic control valve 15 is fastened to the boss portion 34.
- the leg portion 15C extends in the E direction and the B direction at the end portion of the large diameter portion 15A of the intake hydraulic control valve 15 in the D direction.
- the chain casing 20 includes a boss portion 35 on the side of the A direction of the end portion of the exhaust side cylinder portion 24 in the C direction.
- the boss portion 35 is provided in the bulging portion 21.
- a leg portion 16C of the exhaust hydraulic control valve 16 is fastened to the boss portion 35.
- the leg portion 16C extends in the E direction and the A direction at the end portion of the large diameter portion 16A of the exhaust hydraulic control valve 16 in the D direction.
- An extension rib 31, a connection rib 32, and an upper rib 33 are formed on the surface of the chain casing 20.
- the extension rib 31, the connection rib 32, and the upper rib 33 protrude in the E direction.
- a boss portion 37 which extends in the E direction is formed in the vicinity of the end portion of the bulging portion 21 of the chain casing 20 in the D direction.
- a boss portion 36 which extends in the E direction is formed at the end portion of the chain casing 20 in the A direction.
- the extension rib 31 extends upward from the boss portion 34 formed at one end portion 23C of the intake side cylinder portion 23 in the axial direction.
- the reinforcement rib 28 is connected to the extension rib 31.
- the extension rib 31 extends from the boss portion 34 to the vicinity of the cylinder head fastening portion 42 of the end portion of the chain casing 20 in the C direction.
- the extension rib 31 reinforces the boss portion 34 by distributing the load acting on the boss portion 34 to the end portion of the chain casing 20 in the C direction.
- connection rib 32 is provided at a position on the side of the other end portion 24D of the exhaust side cylinder portion 24 in the axial direction in the chain casing 20 and in the vicinity of the end portion of the bulging portion 21 in the D direction.
- the connection rib 32 extends from the end portion of the exhaust side cylinder portion 24 in the D direction to the boss portion 37 in the A direction and the D direction.
- the connection rib 32 connects the other end portion 24D of the exhaust side cylinder portion 24 in the axial direction to the bulging portion 21.
- the connection rib 32 connects the other end portion 24D of the exhaust side cylinder portion 24 to the boss portion 37 formed in the bulging portion 21.
- the upper rib 33 is provided in the vicinity of the end portion of the chain casing 20 in the A direction.
- the upper rib 33 extends from the boss portion 35 to the boss portion 36 in the A direction and the C direction.
- the upper rib 33 is connected to the boss portion 35 and the boss portion 36.
- the boss portion 35 and the boss portion 36 are connected by the upper rib 33. Accordingly, the load acting on the boss portion 35 is distributed to the boss portion 36 through the upper rib 33.
- the reinforcement rib 38 is connected to the boss portion 35 and the reinforcement rib 38 extends from the boss portion 35 in the D direction.
- the load acting on the boss portion 35 is also distributed to the portion in the vicinity of the boss portion 35 of the bulging portion 21 in the D direction by the reinforcement rib 38.
- the exhaust side cylinder portion 24 is adjacently formed below the bulging portion 21. Further, the other end portion 24D of the exhaust side cylinder portion 24 in the axial direction is disposed below one end portion 24C of the exhaust side cylinder portion 24 in the axial direction. Then, the chain casing 20 includes the connection rib 32 which is formed on the side of the other end portion 24D of the exhaust side cylinder portion 24 in the axial direction to connect the other end portion 24D of the exhaust side cylinder portion 24 in the axial direction to the bulging portion 21.
- the chain casing 20 includes the reinforcement rib 28 which extends in the axial direction of the exhaust side cylinder portion 24 from one end portion 24C of the exhaust side cylinder portion 24 in the axial direction to at least a position above the large diameter portion along the end portion on the side opposite to the bulging portion 21 in the exhaust side cylinder portion 24.
- the large diameter portion 16A of the exhaust hydraulic control valve 16 exposed from the exhaust side cylinder portion 24 to the outside can be surrounded from below by the reinforcement rib 28, the exhaust side cylinder portion 24, and the bulging portion 21. Therefore, when foreign matter such as flying stones flies from the road surface below the vehicle toward the exhaust hydraulic control valve 16 along the arrow B (see Fig. 4 ), foreign matter collides with the bulging portion 21 or the connection rib 32 and falls without colliding with the exhaust hydraulic control valve 16. Thus, it is possible to more effectively protect the large diameter portion 16A of the exhaust hydraulic control valve 16 exposed from the exhaust side cylinder portion 24 to the outside from foreign matter such as flying stones.
- the intake side fastening boss portion 25 is connected to the lower surface of the reinforcement rib 28 and the intake side fastening boss portion 25 has a dimension (height) larger than that of the reinforcement rib 28 in the E direction. Therefore, it is also possible to more effectively protect the large diameter portion 16A from foreign matter such as flying stones by the intake side fastening boss portion 25.
- the chain casing 20 includes the intake side cylinder portion 23 adjacently formed above the exhaust side cylinder portion 24 to be parallel to the axial direction of the exhaust side cylinder portion 24 and to be located at a position different from the exhaust side cylinder portion 24 in the axial direction. Then, the reinforcement rib 28 connects one end portion 24C of the exhaust side cylinder portion 24 in the axial direction to one end portion 23C of the intake side cylinder portion 23 in the axial direction.
- the exhaust side cylinder portion 24 and the intake side cylinder portion 23 are connected by the reinforcement rib 28, it is possible to reinforce the exhaust side cylinder portion 24 and the intake side cylinder portion 23 by more firmly connecting them and to suppress the vibration or deformation of the exhaust side cylinder portion 24 and the intake side cylinder portion 23.
- the reinforcement rib 28 extends to one end portion 23C of the intake side cylinder portion 23 in the axial direction.
- the chain casing 20 includes the extension rib 31 which is connected to the reinforcement rib 28 and extends upward from one end portion 23C of the intake side cylinder portion 23 in the axial direction.
- the large diameter portion 15A of the intake hydraulic control valve 15 inserted into the intake side cylinder portion 23 is surrounded from below by the bulging portion 21, the reinforcement rib 28, and the extension rib 31. Therefore, it is possible to more effectively protect the large diameter portion 15A of the intake hydraulic control valve 15 exposed from the intake side cylinder portion 23 to the outside from foreign matter such as flying stones.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
[Object]To provide an internal combustion engine capable of protecting a portion of a hydraulic control valve exposed to the outside from foreign matter such as flying stones flying from below.[Solution]An exhaust side cylinder portion (24) is adjacently formed below a bulging portion (21). Further, the other end portion (24D) of the exhaust side cylinder portion (24) in the axial direction is disposed below one end portion (24C) of the exhaust side cylinder portion (24) in the axial direction. Then, a chain casing (20) includes a connection rib (32) which is formed on the side of the other end portion (24D) of the exhaust side cylinder portion (24) in the axial direction to connect the other end portion (24D) of the exhaust side cylinder portion (24) in the axial direction to the bulging portion (21).
Description
- This invention relates to an internal combustion engine.
-
JP 2006-118497 A JP 2006-118497 A - [Patent Literature 1]
JP 2006-118497 A - However, in the technique described in Patent Literature 1, since the first solenoid valve and the second solenoid valve are arranged to protrude from an end portion of the timing chain cover to the outside, there is concern that a portion of the first solenoid valve or the second solenoid valve exposed to the outside may be damaged by collision with foreign matter such as flying stones flying from a road surface.
- This invention has been made in view of the above-described circumstances and an object of this invention is to provide an internal combustion engine capable of protecting a portion of a hydraulic control valve exposed to the outside from foreign matter such as flying stones flying from below.
- According to aspects of this invention, there is provided an internal combustion engine including: a variable valve timing mechanism configured by winding a timing chain thereon; a hydraulic control valve controlling hydraulic oil supplied to the variable valve timing mechanism; and a chain casing fixed to a cylinder head to cover the timing chain and the variable valve timing mechanism, wherein the chain casing includes a bulging portion bulging in a crank shaft direction and covering the variable valve timing mechanism and a cylindrical cylinder portion attaching the hydraulic control valve thereto, wherein the hydraulic control valve includes a small diameter portion inserted from one end portion of the cylinder portion in an axial direction to the cylinder portion and a large diameter portion exposed from one end portion of the cylinder portion in the axial direction, wherein the internal combustion engine is mounted on a vehicle so that center lines of a plurality of cylinders are inclined with respect to an up to down direction of the vehicle, wherein the cylinder portion is adjacently formed below the bulging portion, wherein the other end portion of the cylinder portion in the axial direction is disposed below one end portion of the cylinder portion in the axial direction, and wherein the chain casing includes a connection rib formed on the side of the other end portion of the cylinder portion in the axial direction to connect the other end portion of the cylinder portion in the axial direction to the bulging portion.
- In this way, according to this invention, it is possible to provide an internal combustion engine capable of protecting a portion of a hydraulic control valve exposed to the outside from foreign matter such as flying stones flying from below.
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- [
Fig. 1] Fig. 1 is a front view of an internal combustion engine according to an embodiment of this invention. - [
Fig. 2] Fig. 2 is a perspective view of a chain casing and a hydraulic control valve of the internal combustion engine according to an embodiment of this invention. - [
Fig. 3] Fig. 3 is a perspective view of a chain casing of the internal combustion engine according to an embodiment of this invention. - [
Fig. 4] Fig. 4 is a front view of the chain casing and the hydraulic control valve of the internal combustion engine according to an embodiment of this invention. - An internal combustion engine according to embodiments of this invention is an internal combustion engine including: a variable valve timing mechanism configured by winding a timing chain thereon; a hydraulic control valve controlling hydraulic oil supplied to the variable valve timing mechanism; and a chain casing fixed to a cylinder head to cover the timing chain and the variable valve timing mechanism, wherein the chain casing includes a bulging portion bulging in a crank shaft direction and covering the variable valve timing mechanism and a cylindrical cylinder portion attaching the hydraulic control valve thereto, wherein the hydraulic control valve includes a small diameter portion inserted from one end portion of the cylinder portion in an axial direction to the cylinder portion and a large diameter portion exposed from one end portion of the cylinder portion in the axial direction, wherein the internal combustion engine is mounted on a vehicle so that center lines of a plurality of cylinders are inclined with respect to an up to down direction of the vehicle, wherein the cylinder portion is adjacently formed below the bulging portion, wherein the other end portion of the cylinder portion in the axial direction is disposed below one end portion of the cylinder portion in the axial direction, and wherein the chain casing includes a connection rib formed on the side of the other end portion of the cylinder portion in the axial direction to connect the other end portion of the cylinder portion in the axial direction to the bulging portion.
- Accordingly, the internal combustion engine according to an embodiment of this invention can protect a portion exposed to the outside of the hydraulic control valve from foreign matter such as flying stones flying from below.
- Hereinafter, an internal combustion engine according to an embodiment of this invention will be described with reference to the drawings.
Figs. 1 to 4 are diagrams showing the internal combustion engine according to an embodiment of this invention. - In
Figs. 1 to 4 , the display in the up, down, front, rear, right, and left directions shows the up, down, front, rear, right, and left when mounted on the vehicle. Further, the display of the AB direction, the CD direction, and the EF direction is based on the case in which the internal combustion engine separated from the vehicle is upright so that the cylinder head is located right above the crank shaft. The AB direction, the CD direction, and the EF direction are directions orthogonal to each other and the EF direction coincides with the front to rear direction of the vehicle equipped with the internal combustion engine. - First, a configuration will be described. In
Fig. 1 , an internal combustion engine 1 mounted on the vehicle includes acylinder block 2. Thecylinder block 2 is provided with acrank shaft 2A and thecrank shaft 2A extends in the EF direction. - The
cylinder block 2 is provided with three cylinders (not shown) arranged in the EF direction and the cylinder extends in the AB direction. The internal combustion engine 1 of this embodiment is an FR (front engine-rear drive) type vertical engine. Additionally, the internal combustion engine 1 is not limited to an in-line engine and may be, for example, a V-type engine. Then, the number of cylinders is not limited to three. - A
cylinder head 3 is provided at the end portion of thecylinder block 2 in the A direction. Thecylinder head 3 includes an intake port (not shown) which takes air, anexhaust port 3B which discharges an exhaust gas, an intake valve, and an exhaust valve (not shown). Theexhaust port 3B opens to a side wall of thecylinder head 3 in the D direction. The intake port opens to a side wall of thecylinder head 3 in the C direction. - A cylinder head cover 4 is installed at the end portion of the
cylinder head 3 in the A direction. Anoil pan 5 is installed at the end portion of thecylinder block 2 in the B direction and theoil pan 5 stores lubricating oil of the internal combustion engine 1. - The internal combustion engine 1 is installed below a floor panel of a driver seat on the front part of the vehicle (not shown). Thus, the vehicle equipped with the internal combustion engine 1 is a so-called cab-over type vehicle in which a driver seat is disposed above the internal combustion engine 1. The internal combustion engine 1 is installed in the vehicle so that the center line C of the cylinder is inclined in the left to right direction with respect to the up to down direction of the vehicle.
- An undercover 1A is provided below the internal combustion engine 1. The undercover 1A extends in the horizontal direction and covers the internal combustion engine 1 from below. A
bottom surface 5A of theoil pan 5 is located at the bottom portion of the internal combustion engine 1 in a vehicle mounted state. Thisbottom surface 5A is inclined with respect to the left to right direction of the internal combustion engine 1 itself to extend in parallel to the undercover lAin the vehicle mounted state. - In this way, the internal combustion engine 1 is mounted on the front part of the vehicle in a largely inclined posture. Therefore, in the vehicle mounted state, the side surface (intake side) of the internal combustion engine 1 in the C direction faces the upper side of the vehicle and the side surface (exhaust side) of the internal combustion engine 1 in the D direction faces the lower side of the vehicle.
- The internal combustion engine 1 includes a variable
valve timing mechanism 11 on which atiming chain 10 is wound and the cylinder head cover 4 which is connected to thecylinder head 3. Further, the internal combustion engine 1 includes an intakehydraulic control valve 15 and an exhausthydraulic control valve 16 each having a cylindrical shape and serving as an intake hydraulic control valve controlling hydraulic oil supplied to the variablevalve timing mechanism 11. - The internal combustion engine 1 includes a
chain casing 20 and thischain casing 20 is fixed to the side surface of thecylinder head 3. Thechain casing 20 covers thetiming chain 10 and the variablevalve timing mechanism 11. The variablevalve timing mechanism 11 includes an intake side variablevalve timing mechanism 12 which is disposed on the side of the intake port and an exhaust side variablevalve timing mechanism 13 which is disposed on the side of theexhaust port 3B. - The internal combustion engine 1 includes an
oil pan 5 which is provided on the side opposite to thecylinder head 3 with respect to the chain casing and is connected to thecylinder head 3 through thecylinder block 2, an intake port which is provided in thecylinder head 3 and takes air, and anexhaust port 3B which is provided on the side opposite to the intake port with respect to the chain casing and discharges an exhaust gas. - The
chain casing 20 is provided with a bulgingportion 21 which covers the variablevalve timing mechanism 11. The bulgingportion 21 bulges in the crank shaft direction. Here the crank shaft direction is the axial direction of thecrank shaft 2A. In this embodiment, thebulging portion 21 bulges toward the outside of the chain casing 20 (the front side in the vehicle mounted state). The bulgingportion 21 is formed at the end portion on the side of the cylinder head cover 4 (the end portion in the A direction) of thechain casing 20. The intakehydraulic control valve 15 and the exhausthydraulic control valve 16 are arranged closer to theoil pan 5 than the bulgingportion 21 of thechain casing 20. - Further, the internal combustion engine 1 includes an
oil pump 6 and theoil pump 6 pressure-feeds oil stored in theoil pan 5 to a lubrication required portion and the variablevalve timing mechanism 11. Theoil pump 6 is provided around thecrank shaft 2A. - Here, in this embodiment, the direction of the cylinder head cover 4 with respect to the
chain casing 20 and the direction of theoil pan 5 are defined as the AB direction, the direction of the intake port with respect to thechain casing 20 and the direction of theexhaust port 3B are defined as the CD direction, and the outward direction of the chain casing 20 (the front side in the vehicle mounted state) and the inward direction (the rear side in the vehicle mounted state) are defined as the EF direction. - The intake
hydraulic control valve 15 is disposed on the side of the intake port in the CD direction. The exhausthydraulic control valve 16 is disposed on the side of theexhaust port 3B in the CD direction. - In
Figs. 2 and4 , thechain casing 20 is provided with a cylindrical intakeside cylinder portion 23 to which the intakehydraulic control valve 15 is attached and a cylindrical exhaustside cylinder portion 24 to which the exhausthydraulic control valve 16 is attached. The intakeside cylinder portion 23 and the exhaustside cylinder portion 24 extend in the CD direction. The exhaustside cylinder portion 24 constitutes the cylinder portion and the first cylinder portion of this invention. The intakeside cylinder portion 23 constitutes the second cylinder portion of this invention. - The intake
side cylinder portion 23 and the exhaustside cylinder portion 24 are adjacently formed below the bulgingportion 21. In a state in which the internal combustion engine 1 is mounted on the vehicle, theother end portion 23D (the end portion in the D direction. SeeFig. 4 ) of the intakeside cylinder portion 23 in the axial direction is disposed below one end portion 23C of the intakeside cylinder portion 23 in the axial direction (the end portion in the C direction. SeeFig. 4 ). Similarly, theother end portion 24D of the exhaustside cylinder portion 24 in the axial direction (the end portion in the D direction. SeeFig. 4 ) is disposed below oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction (the end portion in the C direction. SeeFig. 4 ). - In
Figs. 1 and4 , the intakehydraulic control valve 15 includes asmall diameter portion 15B (seeFig. 1 ) which is inserted from one end portion 23C of the intakeside cylinder portion 23 in the axial direction (seeFig. 4 ) into the intakeside cylinder portion 23 and alarge diameter portion 15A (seeFig. 1 ) which is exposed from one end portion 23C of the intakeside cylinder portion 23 in the axial direction (seeFig. 4 ). Similarly, the exhausthydraulic control valve 16 includes asmall diameter portion 16B (seeFig. 1 ) which is inserted from oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction (seeFig. 4 ) into the exhaustside cylinder portion 24 and alarge diameter portion 16A (seeFig. 1 ) which is exposed from oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction (seeFig. 4 ). - In
Fig. 3 , the intakeside cylinder portion 23 is provided with anaccommodation hole 23A accommodating thesmall diameter portion 15B of the intakehydraulic control valve 15. The exhaustside cylinder portion 24 is provided with anaccommodation hole 24A accommodating thesmall diameter portion 16B of the exhausthydraulic control valve 16. - In
Fig. 1 , thechain casing 20 is provided with an oilpump accommodation portion 29 which accommodates theoil pump 6. The intakeside cylinder portion 23, the exhaustside cylinder portion 24, and the oilpump accommodation portion 29 are integrally formed with each other. - The oil
pump accommodation portion 29 is a flat portion which does not bulge in the direction of the crank shaft in thechain casing 20. The oilpump accommodation portion 29 is disposed below the bulgingportion 21 and is continuous to the lower portion of the bulgingportion 21. - Since the oil
pump accommodation portion 29 has a flat shape rather than a bulging shape like the bulgingportion 21, the rigidity thereof is inferior to that of the bulgingportion 21 as it is. Here, in this embodiment, the rigidity of the portion provided with the intakeside cylinder portion 23 and the exhaustside cylinder portion 24 of the oilpump accommodation portion 29 is improved. Further, since it is preferable to compactly arrange the intakeside cylinder portion 23 and the exhaustside cylinder portion 24 in the AB direction, the intakeside cylinder portion 23 and the exhaustside cylinder portion 24 are arranged to be offset in the CD direction and the EF direction. - A connector (not shown) for electrically controlling the intake
hydraulic control valve 15 and the exhausthydraulic control valve 16 is connected to the side of the intake port of thelarge diameter portions chain casing 20 in the EF direction. - Here, since the internal combustion engine 1 of this embodiment is mounted on the vehicle in a largely inclined posture, the uppermost portions of the intake
hydraulic control valve 15 and the exhausthydraulic control valve 16 in the up to down direction of the vehicle are located below the uppermost portion of the cylinder head cover 4 in the up to down direction of the vehicle in the vehicle mounted state. Further, a connector (not shown) of the end portion on the side of the intake port of thelarge diameter portion 16A of the exhausthydraulic control valve 16 in the CD direction is disposed at a position which is on the lower side in the up to down direction of the vehicle and on the side of the cylinder head cover 4 with respect to a connector (not shown) of the end portion on the side of the intake port of thelarge diameter portion 15A of the intakehydraulic control valve 15 in the CD direction. - Accordingly, the connector of the
large diameter portion 16A of the exhausthydraulic control valve 16 is disposed between the connector of thelarge diameter portion 15A of the intakehydraulic control valve 15 and the cylinder head cover 4 and below the uppermost portions of both the intakehydraulic control valve 15 and the cylinder head cover 4 in the up to down direction of the vehicle. Therefore, it is possible to suppress foreign matter such as dust from settling and accumulating on the connector of thelarge diameter portion 16A of the exhausthydraulic control valve 16 without disposing the exhausthydraulic control valve 16 inside the cylinder head cover 4. - The intake
hydraulic control valve 15 and the exhausthydraulic control valve 16 are respectively inserted in the D direction from the end portions of the intakeside cylinder portion 23 and the exhaustside cylinder portion 24 in the C direction (the upper side in the vehicle mounted state). Therefore, since the insertion directions of the intakehydraulic control valve 15 and the exhausthydraulic control valve 16 are the same as each other, the insertion work can be facilitated. - Further, since the intake
hydraulic control valve 15 is disposed above the intakeside cylinder portion 23 and the exhausthydraulic control valve 16 is disposed above the exhaustside cylinder portion 24 in the vehicle mounted state, it is possible to prevent a foreign mater from entering the intakehydraulic control valve 15 and the exhausthydraulic control valve 16 even when the foreign matter or the like mixed with the hydraulic oil precipitates. - In
Fig. 3 , the edge portion of thechain casing 20 is provided with a plurality of cylinderhead fastening portions head fastening portions fastening holes pump accommodation portion 29 to thecylinder head 3. The cylinderhead fastening portions head fastening portions chain casing 20 is a portion having a large wall thickness and high strength. - In
Figs. 3 and4 , theaccommodation hole 23A of the intakeside cylinder portion 23 and theaccommodation hole 24A of the exhaustside cylinder portion 24 are arranged on either the side of the intake port or the side of theexhaust port 3B in the CD direction and open to either the side of the intake port or the side of theexhaust port 3B. That is, theaccommodation hole 23A of the intakeside cylinder portion 23 and theaccommodation hole 24A of the exhaustside cylinder portion 24 are arranged in the same direction in the CD direction and open in the same direction. In this embodiment, theaccommodation hole 23A of the intakeside cylinder portion 23 and theaccommodation hole 24A of the exhaustside cylinder portion 24 are arranged on the side of the intake port and open to the side of the intake port. - In
Fig. 3 , anaxis 23R of theaccommodation hole 23A of the intakeside cylinder portion 23 and anaxis 24R of theaccommodation hole 24A of the exhaustside cylinder portion 24 are arranged at different positions in the EF direction. - Specifically, the
axis 23R is disposed on the inside of thechain casing 20 in relation to theaxis 24R in the EF direction. Theaxis 23R and theaxis 24R are parallel to each other. Accordingly, since the casting pins forming theaccommodation holes side cylinder portion 23 and the exhaustside cylinder portion 24 in the CD direction (the direction of theaxes - In
Fig. 1 , at least a part of the intakeside cylinder portion 23 and the exhaustside cylinder portion 24 overlaps in the AB direction. - In
Fig. 3 , thechain casing 20 includes a wall-shapedconnection portion 43. Theconnection portion 43 extends in the EF direction and connects the end portion on the side of theexhaust port 3B (theother end portion 23D shown inFig. 4 ) of the intakeside cylinder portion 23 in the CD direction to the end portion on the side of the intake port (oneend portion 24C shown inFig. 4 ) of the exhaustside cylinder portion 24 in the CD direction. Additionally, theconnection portion 43 also extends in the AB direction. Thus, theconnection portion 43 connects the intakeside cylinder portion 23 and the exhaustside cylinder portion 24 in the EF direction and the AB direction. - In
Fig. 3 , thechain casing 20 includes a cylindricaloil gallery portion 27 and an oil passage (not shown) through which hydraulic oil flows is formed inside theoil gallery portion 27. - The
oil gallery portion 27 extends in the CD direction. Thechain casing 20 includes awall portion 21A extending in the EF direction and continuous to the oilpump accommodation portion 29 and thiswall portion 21A is provided at the end portion on the side of theoil pan 5 in the bulgingportion 21 in the AB direction. The intakeside cylinder portion 23 and the exhaustside cylinder portion 24 are arranged between theoil gallery portion 27 and thewall portion 21A in the AB direction. - Additionally, in order to suppress the vibration of an intake manifold (not shown) connected to the intake port of the
cylinder head 3 from being transmitted to thechain casing 20, it is preferable to improve the rigidity of the portion in the vicinity of the intake manifold in thechain casing 20. Here, the intake port and the intake manifold connected to the intake port are arranged between the cylinderhead fastening portion 41 and the cylinderhead fastening portion 42 in the AB direction. Accordingly, since it is possible to set the distance between the cylinderhead fastening portion 41 and the cylinderhead fastening portion 42 to a minimum distance, it is possible to improve the rigidity of the portion in the vicinity of the cylinderhead fastening portions chain casing 20. Further, it is possible to suppress the vibration of the portion in the vicinity of the cylinderhead fastening portions chain casing 20. - The
chain casing 20 includes an intake sidefastening boss portion 25 and an exhaust sidefastening boss portion 26 for attaching thechain casing 20 to thecylinder head 3. The intake sidefastening boss portion 25 and the exhaust sidefastening boss portion 26 are arranged in the vicinity of the bulgingportion 21 in the B direction. - The end portion of the bulging
portion 21 in the B direction is connected to the end portions of the intakeside cylinder portion 23 and the exhaustside cylinder portion 24 in the A direction. The end portion of the intake sidefastening boss portion 25 in the A direction is connected to the end portion of the intakeside cylinder portion 23 in the B direction. The end portion of the exhaust sidefastening boss portion 26 in the A direction is connected to the end portion of the exhaustside cylinder portion 24 in the B direction. The end surface of thecylinder head 3 in the A direction forms a planar joint surface extending in the CD direction and the EF direction and is joined to the cylinder head cover 4. - The intake
hydraulic control valve 15, the exhausthydraulic control valve 16, the intakeside cylinder portion 23, and the exhaustside cylinder portion 24 extend in the CD direction. Further, the intakehydraulic control valve 15 and the intakeside cylinder portion 23 are arranged side by side in the EF direction with respect to the exhausthydraulic control valve 16 and the exhaustside cylinder portion 24. - The intake side
fastening boss portion 25 and the exhaust sidefastening boss portion 26 are arranged side by side in the CD direction. The intake sidefastening boss portion 25 and the exhaust sidefastening boss portion 26 are formed to protrude in the E direction (forward in the vehicle mounted state) in relation to the intakeside cylinder portion 23. - The intake
side cylinder portion 23 and the exhaustside cylinder portion 24 are arranged side by side at different positions in the crank shaft direction. The intakeside cylinder portion 23 and the exhaustside cylinder portion 24 are arranged in parallel in the crank shaft direction so that a part thereof overlaps in the crank shaft direction. In this embodiment, the exhaustside cylinder portion 24 is disposed adjacent to the front side of the intakeside cylinder portion 23. - Further, when the
chain casing 20 is viewed along the crank shaft direction (seeFig. 4 ), the exhaustside cylinder portion 24 is disposed to be offset to the exhaust side (the D direction) in relation to the intakeside cylinder portion 23. In this embodiment, the exhaustside cylinder portion 24 is disposed adjacently to the side of the D direction of the intakeside cylinder portion 23. Thus, the exhaustside cylinder portion 24 is adjacently disposed in the E direction and the D direction of the intakeside cylinder portion 23. - Thus, the intake
side cylinder portion 23 is adjacently formed above the exhaustside cylinder portion 24 to be parallel to the axial direction of the exhaustside cylinder portion 24 and to be located at a position different from the exhaustside cylinder portion 24 in the axial direction. - In
Figs. 3 and4 , theoil gallery portion 27 extends in a direction orthogonal to the crank shaft direction through the end portion of the intake sidefastening boss portion 25 in the B direction and the end portion of the exhaust sidefastening boss portion 26 in the B direction. Theoil gallery portion 27 is connected to the end portion of the intake sidefastening boss portion 25 in the B direction and the end portion of the exhaust sidefastening boss portion 26 in the B direction. - The
chain casing 20 includes areinforcement rib 28 formed below the intakeside cylinder portion 23. Thereinforcement rib 28 extends in the axial direction of the intakeside cylinder portion 23. Thereinforcement rib 28 connects the intakeside cylinder portion 23, the exhaustside cylinder portion 24, and the intake sidefastening boss portion 25. - Specifically, the
reinforcement rib 28 extends in the axial direction of the exhaustside cylinder portion 24 from oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction to at least a position above the large diameter portion along the end portion on the side opposite to the bulging portion 21 (the end portion in the B direction) in the exhaustside cylinder portion 24. Thereinforcement rib 28 connects oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction to one end portion 23C of the intakeside cylinder portion 23 in the axial direction. Specifically, thereinforcement rib 28 extends to one end portion 23C of the intakeside cylinder portion 23 in the axial direction and connects oneend portion 24C of the exhaustside cylinder portion 24 to aboss portion 34 formed at one end portion 23C of the intakeside cylinder portion 23. - The
chain casing 20 includes theboss portion 34 formed at the end portion of the intakeside cylinder portion 23 in the C direction and the B direction. Theboss portion 34 is provided in the B direction of the bulgingportion 21. Aleg portion 15C of the intakehydraulic control valve 15 is fastened to theboss portion 34. Theleg portion 15C extends in the E direction and the B direction at the end portion of thelarge diameter portion 15A of the intakehydraulic control valve 15 in the D direction. - The
chain casing 20 includes aboss portion 35 on the side of the A direction of the end portion of the exhaustside cylinder portion 24 in the C direction. Theboss portion 35 is provided in the bulgingportion 21. Aleg portion 16C of the exhausthydraulic control valve 16 is fastened to theboss portion 35. Theleg portion 16C extends in the E direction and the A direction at the end portion of thelarge diameter portion 16A of the exhausthydraulic control valve 16 in the D direction. - An
extension rib 31, aconnection rib 32, and anupper rib 33 are formed on the surface of thechain casing 20. Theextension rib 31, theconnection rib 32, and theupper rib 33 protrude in the E direction. - A
boss portion 37 which extends in the E direction is formed in the vicinity of the end portion of the bulgingportion 21 of thechain casing 20 in the D direction. Aboss portion 36 which extends in the E direction is formed at the end portion of thechain casing 20 in the A direction. - The
extension rib 31 extends upward from theboss portion 34 formed at one end portion 23C of the intakeside cylinder portion 23 in the axial direction. Thereinforcement rib 28 is connected to theextension rib 31. Theextension rib 31 extends from theboss portion 34 to the vicinity of the cylinderhead fastening portion 42 of the end portion of thechain casing 20 in the C direction. Theextension rib 31 reinforces theboss portion 34 by distributing the load acting on theboss portion 34 to the end portion of thechain casing 20 in the C direction. - The
connection rib 32 is provided at a position on the side of theother end portion 24D of the exhaustside cylinder portion 24 in the axial direction in thechain casing 20 and in the vicinity of the end portion of the bulgingportion 21 in the D direction. Theconnection rib 32 extends from the end portion of the exhaustside cylinder portion 24 in the D direction to theboss portion 37 in the A direction and the D direction. Theconnection rib 32 connects theother end portion 24D of the exhaustside cylinder portion 24 in the axial direction to the bulgingportion 21. Specifically, theconnection rib 32 connects theother end portion 24D of the exhaustside cylinder portion 24 to theboss portion 37 formed in the bulgingportion 21. - Thus, the exhaust
side cylinder portion 24 and theboss portion 37 are connected by theconnection rib 32. Accordingly, a load acting on the exhaustside cylinder portion 24 is distributed to thechain casing 20 through theboss portion 37. - The
upper rib 33 is provided in the vicinity of the end portion of thechain casing 20 in the A direction. Theupper rib 33 extends from theboss portion 35 to theboss portion 36 in the A direction and the C direction. Theupper rib 33 is connected to theboss portion 35 and theboss portion 36. Thus, theboss portion 35 and theboss portion 36 are connected by theupper rib 33. Accordingly, the load acting on theboss portion 35 is distributed to theboss portion 36 through theupper rib 33. Further, thereinforcement rib 38 is connected to theboss portion 35 and thereinforcement rib 38 extends from theboss portion 35 in the D direction. The load acting on theboss portion 35 is also distributed to the portion in the vicinity of theboss portion 35 of the bulgingportion 21 in the D direction by thereinforcement rib 38. - As described above, in this embodiment, the exhaust
side cylinder portion 24 is adjacently formed below the bulgingportion 21. Further, theother end portion 24D of the exhaustside cylinder portion 24 in the axial direction is disposed below oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction. Then, thechain casing 20 includes theconnection rib 32 which is formed on the side of theother end portion 24D of the exhaustside cylinder portion 24 in the axial direction to connect theother end portion 24D of the exhaustside cylinder portion 24 in the axial direction to the bulgingportion 21. - Accordingly, when foreign matter such as flying stones flows from the road surface below the vehicle toward the exhaust
hydraulic control valve 16 along the arrow A (seeFig. 4 ), foreign matter collides with thewall portion 21A of the bulgingportion 21 or theconnection rib 32 and falls without colliding with the exhausthydraulic control valve 16. Thus, it is possible to protect thelarge diameter portion 16A which is a portion of the exhausthydraulic control valve 16 exposed to the outside from foreign matter such as flying stones flying from below. - Further, in this embodiment, the
chain casing 20 includes thereinforcement rib 28 which extends in the axial direction of the exhaustside cylinder portion 24 from oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction to at least a position above the large diameter portion along the end portion on the side opposite to the bulgingportion 21 in the exhaustside cylinder portion 24. - Accordingly, the
large diameter portion 16A of the exhausthydraulic control valve 16 exposed from the exhaustside cylinder portion 24 to the outside can be surrounded from below by thereinforcement rib 28, the exhaustside cylinder portion 24, and the bulgingportion 21. Therefore, when foreign matter such as flying stones flies from the road surface below the vehicle toward the exhausthydraulic control valve 16 along the arrow B (seeFig. 4 ), foreign matter collides with the bulgingportion 21 or theconnection rib 32 and falls without colliding with the exhausthydraulic control valve 16. Thus, it is possible to more effectively protect thelarge diameter portion 16A of the exhausthydraulic control valve 16 exposed from the exhaustside cylinder portion 24 to the outside from foreign matter such as flying stones. Additionally, the intake sidefastening boss portion 25 is connected to the lower surface of thereinforcement rib 28 and the intake sidefastening boss portion 25 has a dimension (height) larger than that of thereinforcement rib 28 in the E direction. Therefore, it is also possible to more effectively protect thelarge diameter portion 16A from foreign matter such as flying stones by the intake sidefastening boss portion 25. - Further, in this embodiment, the
chain casing 20 includes the intakeside cylinder portion 23 adjacently formed above the exhaustside cylinder portion 24 to be parallel to the axial direction of the exhaustside cylinder portion 24 and to be located at a position different from the exhaustside cylinder portion 24 in the axial direction. Then, thereinforcement rib 28 connects oneend portion 24C of the exhaustside cylinder portion 24 in the axial direction to one end portion 23C of the intakeside cylinder portion 23 in the axial direction. - Accordingly, since foreign matter such as flying stones flying from the lower side of the vehicle collides with the
reinforcement rib 28, it is possible to effectively protect thelarge diameter portion 15A of the intakehydraulic control valve 15 exposed from the intakeside cylinder portion 23 to the outside. - Further, since the exhaust
side cylinder portion 24 and the intakeside cylinder portion 23 are connected by thereinforcement rib 28, it is possible to reinforce the exhaustside cylinder portion 24 and the intakeside cylinder portion 23 by more firmly connecting them and to suppress the vibration or deformation of the exhaustside cylinder portion 24 and the intakeside cylinder portion 23. - Further, in this embodiment, the
reinforcement rib 28 extends to one end portion 23C of the intakeside cylinder portion 23 in the axial direction. Then, thechain casing 20 includes theextension rib 31 which is connected to thereinforcement rib 28 and extends upward from one end portion 23C of the intakeside cylinder portion 23 in the axial direction. - Accordingly, the
large diameter portion 15A of the intakehydraulic control valve 15 inserted into the intakeside cylinder portion 23 is surrounded from below by the bulgingportion 21, thereinforcement rib 28, and theextension rib 31. Therefore, it is possible to more effectively protect thelarge diameter portion 15A of the intakehydraulic control valve 15 exposed from the intakeside cylinder portion 23 to the outside from foreign matter such as flying stones. - While embodiments of this invention have been described, it is apparent that some artisan could have made changes without departing from the scope of this invention. It is intended that any and all such modifications and equivalents are involved in the appended claims.
- 1 ... Internal combustion engine, 3 ... Cylinder head, 11 ... Variable valve timing mechanism, 15 ... Intake hydraulic control valve, 15A ... Large diameter portion, 15B ... Small diameter portion, 16 ... Exhaust hydraulic control valve, 16A ... Large diameter portion, 16B ... Small diameter portion, 20 ... Chain casing, 21 ... Bulging portion, 23 ... Intake side cylinder portion (second cylinder portion), 23A ... Accommodation hole, 24 ... Exhaust side cylinder portion (cylinder portion, first cylinder portion), 24A ... Accommodation hole, 24C ... One end portion, 24D ... Other end portion, 28 ... Reinforcement rib, 31 ... Extension rib, 32 ... Connection rib
Claims (4)
- An internal combustion engine comprising:a variable valve timing mechanism configured by winding a timing chain thereon;a hydraulic control valve controlling hydraulic oil supplied to the variable valve timing mechanism; anda chain casing fixed to a cylinder head to cover the timing chain and the variable valve timing mechanism,wherein the chain casing includes a bulging portion bulging in a crank shaft direction and covering the variable valve timing mechanism and a cylindrical cylinder portion attaching the hydraulic control valve thereto,wherein the hydraulic control valve includes a small diameter portion inserted from one end portion of the cylinder portion in an axial direction to the cylinder portion and a large diameter portion exposed from one end portion of the cylinder portion in the axial direction,wherein the internal combustion engine is mounted on a vehicle so that center lines of a plurality of cylinders are inclined with respect to an up to down direction of the vehicle,wherein the cylinder portion is adjacently formed below the bulging portion,wherein the other end portion of the cylinder portion in the axial direction is disposed below one end portion of the cylinder portion in the axial direction, andwherein the chain casing includes a connection rib formed on the side of the other end portion of the cylinder portion in the axial direction to connect the other end portion of the cylinder portion in the axial direction to the bulging portion.
- The internal combustion engine according to claim 1,
wherein the chain casing includes a reinforcement rib extending in the axial direction of the cylinder portion from one end portion of the cylinder portion in the axial direction to at least a position above the large diameter portion along an end portion on the side opposite to the bulging portion in the cylinder portion. - The internal combustion engine according to claim 2,wherein when the cylinder portion is a first cylinder portion, the chain casing includes a second cylinder portion adjacently formed above the first cylinder portion to be parallel to the axial direction of the first cylinder portion and to be located at a position different from the first cylinder portion in the axial direction, andwherein the reinforcement rib connects one end portion of the first cylinder portion in the axial direction to one end portion of the second cylinder portion in the axial direction.
- The internal combustion engine according to claim 3,wherein the reinforcement rib extends to one end portion of the second cylinder portion in the axial direction, andwherein the chain casing includes an extension rib connected to the reinforcement rib and extending upward from one end portion of the second cylinder portion in the axial direction.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021191881A JP2023078650A (en) | 2021-11-26 | 2021-11-26 | internal combustion engine |
Publications (1)
Publication Number | Publication Date |
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EP4187068A1 true EP4187068A1 (en) | 2023-05-31 |
Family
ID=84332092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP22207278.7A Pending EP4187068A1 (en) | 2021-11-26 | 2022-11-14 | Internal combustion engine |
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EP (1) | EP4187068A1 (en) |
JP (1) | JP2023078650A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006118497A (en) | 2004-09-27 | 2006-05-11 | Aisin Seiki Co Ltd | Solenoid valve unit and engine cover unit |
US20080216783A1 (en) * | 2007-03-08 | 2008-09-11 | Suzuki Motor Corporation | Variable valve timing mechanism-equipped engine |
US20130319355A1 (en) * | 2012-05-29 | 2013-12-05 | Suzuki Motor Corporation | Engine with variable valve timing mechanism |
FR3084107A1 (en) * | 2018-07-20 | 2020-01-24 | Suzuki Motor Corporation | COVER STRUCTURE OF AN INTERNAL COMBUSTION ENGINE |
-
2021
- 2021-11-26 JP JP2021191881A patent/JP2023078650A/en active Pending
-
2022
- 2022-11-14 EP EP22207278.7A patent/EP4187068A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006118497A (en) | 2004-09-27 | 2006-05-11 | Aisin Seiki Co Ltd | Solenoid valve unit and engine cover unit |
US20080216783A1 (en) * | 2007-03-08 | 2008-09-11 | Suzuki Motor Corporation | Variable valve timing mechanism-equipped engine |
US20130319355A1 (en) * | 2012-05-29 | 2013-12-05 | Suzuki Motor Corporation | Engine with variable valve timing mechanism |
FR3084107A1 (en) * | 2018-07-20 | 2020-01-24 | Suzuki Motor Corporation | COVER STRUCTURE OF AN INTERNAL COMBUSTION ENGINE |
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JP2023078650A (en) | 2023-06-07 |
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