Oil passage structure of internal combustion engine

Abstract

To provide oil passage structure of an internal combustion engine, enabling quick operation of an intake-side valve timing adjustment device after starting the internal combustion engine, thereby enabling reduction of exhaust gas and reduction of fuel consumption.SOLUTION: The oil passage structure of an engine 1 includes an intake-side head oil passage 63 for supplying oil from a main oil passage 62 to an intake-side spool valve 25, and an exhaust-side head oil passage 64 for supplying oil from the main oil passage 62 to an exhaust-side spool valve 26, the exhaust-side head oil passage 64 branches from the main oil passage 62 and is communicated with an exhaust-side in-cam-cap oil passage 66. An intake-side lash adjuster oil passage 74 and an exhaust-side lash adjuster oil passage 75 are communicated with the exhaust-side in-cam-cap oil passage 66 via a first communication oil passage 72 and a second communication oil passage 73, respectively, and a hydraulic sensor 70 is mounted to the intake-side head oil passage 63.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to an oil passage structure of an internal combustion engine. [Background technology]

[0002] Conventionally, there is known a variable valve timing device that is controlled by hydraulic pressure supplied from a hydraulic control valve (see Patent Documents 1 and 2). The variable valve timing device adjusts the relative rotation phase of the camshaft with respect to the crankshaft based on the hydraulic pressure supplied from the hydraulic control valve, thereby adjusting the opening and closing timing of the valves (valve timing).

[0003] The variable valve timing device described in Patent Document 1 is provided at the end of the intake camshaft and the end of the exhaust camshaft, and the hydraulic control valve is attached to the cam chain cover and is composed of an electromagnetic hydraulic control valve that supplies hydraulic pressure to the intake side variable valve timing device and the exhaust side variable valve timing device. An oil passage is provided on the right side wall of the cylinder head for supplying oil to the intake hydraulic control valve and the exhaust hydraulic control valve.

[0004] This oil passage includes a main oil passage extending diagonally upward from the bottom surface of the right side wall of the cylinder head, and an intake VVT ​​supply passage and an exhaust VVT supply passage that are provided in the right side wall of the cylinder head and supply oil from the main oil passage to the intake side hydraulic control valve and the exhaust side hydraulic control valve, respectively.

[0005] The oil passages include an intake-side lash adjuster oil passage that supplies oil to the intake-side lash adjuster, and an exhaust-side lash adjuster oil passage that supplies oil to the exhaust-side lash adjuster.

[0006] The intake-side lash adjuster oil passage is branched off from an internal oil passage of the main oil passage, and oil is supplied to the intake-side lash adjuster oil passage from the internal oil passage.

[0007] The variable valve timing device described in Patent Document 2 has a hydraulic control valve provided at the end of a camshaft, and an actuator unit is installed on the outer periphery of the hydraulic control valve. The actuator unit includes a housing and a vane member that define an advance chamber and a retard chamber to which oil is supplied from the hydraulic control valve.

[0008] The variable valve timing device described in Patent Document 2 can install an actuator unit near the hydraulic control valve, thereby improving responsiveness when changing the valve timing. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2016-128682 A [Patent Document 2] JP 2018-3694 A Summary of the Invention [Problem to be solved by the invention]

[0010] Incidentally, in an engine equipped with a variable valve timing device, activating the intake side variable valve timing device as soon as possible after the engine is started is advantageous in terms of reducing exhaust gas and improving fuel economy.

[0011] However, in order to operate the intake side variable valve timing device quickly after the engine is started, it is necessary to quickly supply oil to the intake side hydraulic control valve and accurately detect the hydraulic pressure supplied to the intake side hydraulic control valve.

[0012] However, in an engine equipped with the variable valve timing device described in Patent Document 1, it is difficult to activate the intake side variable valve timing device early for the following reasons, and there is still room for improvement.

[0013] That is, in the engine equipped with the variable valve timing device described in Patent Document 1, the intake-side lash adjuster oil passage is branched off from an internal oil passage of the main oil passage that supplies oil to the intake VVT ​​supply passage.

[0014] For this reason, when the engine is started, the oil pressure in the intake VVT ​​supply passage is affected by the oil pressure in the intake lash adjuster oil passage, making it difficult to quickly increase the oil pressure in the intake VVT ​​supply passage and making it difficult to operate the intake variable valve timing device early, and there is still room for improvement.

[0015] Furthermore, in an engine equipped with the variable valve timing device described in Patent Document 1, if a hydraulic sensor for detecting hydraulic pressure is provided, if the hydraulic pressure sensor is installed in a position away from the intake hydraulic control valve, there is a risk that the hydraulic pressure acting on the intake hydraulic control valve cannot be accurately detected.

[0016] In other words, in the engines equipped with the variable valve timing devices described in Patent Documents 1 and 2, there is still room for improvement because no consideration is given to the points of quickly supplying oil to the intake side hydraulic control valve and accurately grasping the hydraulic pressure supplied to the intake side hydraulic control valve.

[0017] The present invention has been made in response to the above-mentioned problems, and aims to provide an oil passage structure for an internal combustion engine that can operate an intake side valve timing adjuster quickly after the internal combustion engine is started, thereby reducing exhaust gas and fuel consumption. [Means for solving the problem]

[0018] The present invention relates to a cylinder head having an end wall provided at an axial end of a crankshaft, a cam cap provided on an upper surface of the end wall, an intake camshaft rotatably supported in an intake side bearing portion formed on the upper surface of the end wall and the cam cap, an exhaust camshaft rotatably supported in an exhaust side bearing portion formed on the upper surface of the end wall and the cam cap, an intake side hydraulic control valve provided at an end of the intake camshaft, and an intake side hydraulic control valve provided on an outer periphery of the intake side hydraulic control valve and configured to control the intake pressure on the crankshaft by oil supplied from the intake side hydraulic control valve. an intake valve timing control device having an intake actuator that adjusts the relative rotation phase of a camshaft; an exhaust valve timing control device having an exhaust hydraulic control valve provided at an end of the exhaust camshaft, and an exhaust actuator that is installed on the outer periphery of the exhaust hydraulic control valve and adjusts the relative rotation phase of the exhaust camshaft with respect to the crankshaft by oil supplied from the exhaust hydraulic control valve; a main oil passage provided in the intake port and through which oil is supplied from a hydraulic power source; a lash adjuster oil passage for supplying oil from the main oil passage to the plurality of lash adjusters; an intake side hydraulic control valve oil passage for supplying oil from the main oil passage to the intake side hydraulic control valve through an intake side cam cap oil passage formed in the cam cap and an intake camshaft oil passage formed in the intake camshaft; and an exhaust side hydraulic control valve oil passage for supplying oil from the main oil passage to the exhaust side hydraulic control valve through an exhaust side cam cap oil passage provided in the cam cap and an exhaust camshaft oil passage provided in the exhaust camshaft. an intake side cam cap internal oil passage disposed on the opposite side of the intake side bearing portion from the exhaust side bearing portion, and the exhaust side cam cap internal oil passage disposed between the intake side bearing portion and the exhaust side bearing portion, the intake side hydraulic control valve oil passage is provided in the end wall, and has an intake side head oil passage branching from the main oil passage and communicating with the intake side cam cap internal oil passage, and the exhaust side hydraulic control valve oil passage is provided in the end wall,An exhaust-side head oil passage is provided which branches off from the main oil passage and communicates with the exhaust-side cam cap oil passage, the lash adjuster oil passage communicates with the exhaust-side cam cap oil passage via a connecting oil passage, and the oil pressure sensor is attached to the intake-side head oil passage. Effect of the Invention

[0019] As described above, according to the present invention, the intake valve timing controller can be operated quickly after the internal combustion engine is started, thereby reducing exhaust gas and fuel consumption. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a front view of an internal combustion engine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a top view of the internal combustion engine according to one embodiment of the present invention with the cylinder head cover removed. [Diagram 3] FIG. 3 is a right side view of an upper portion of an internal combustion engine according to an embodiment of the present invention. [Figure 4] 4 is a cross-sectional view taken along the line IV-IV in FIG. [Diagram 5] FIG. 5 is a top view of an internal combustion engine according to one embodiment of the present invention, showing a state in which a cylinder head cover and a cam cap on the front wall side of the cylinder head have been removed. [Figure 6] FIG. 6 is a front view of an upper part of a cylinder head of an internal combustion engine according to one embodiment of the present invention. [Figure 7] 7 is a cross-sectional view taken along the line VII-VII of FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An oil passage structure for an internal combustion engine according to one embodiment of the present invention includes a cylinder head having an end wall provided at an axial end of a crankshaft, a cam cap provided on an upper surface of the end wall, an intake camshaft rotatably supported in an intake side bearing portion formed on the upper surface of the end wall and the cam cap, an exhaust camshaft rotatably supported in an exhaust side bearing portion formed on the upper surface of the end wall and the cam cap, an intake side hydraulic control valve provided at an end of the intake camshaft, and an exhaust camshaft rotatably supported in an exhaust side bearing portion formed on the upper surface of the end wall and the cam cap, an intake side hydraulic control valve provided at the end of the intake camshaft, and an intake side hydraulic control valve provided on an outer periphery of the intake side hydraulic control valve and configured to adjust the intake camshaft relative to the crankshaft by oil supplied from the intake side hydraulic control valve. an intake valve timing controller having an intake side actuator for adjusting a relative rotation phase; an exhaust side hydraulic control valve provided at an end of an exhaust camshaft; and an exhaust side actuator provided on an outer periphery of the exhaust side hydraulic control valve for adjusting the relative rotation phase of the exhaust camshaft with respect to the crankshaft by oil supplied from the exhaust side hydraulic control valve; a plurality of lash adjusters provided in a cylinder head so as to be located in the vicinity of the intake camshaft and the exhaust camshaft; an intake-side hydraulic control valve oil passage that supplies oil from the main oil passage to an intake-side hydraulic control valve through an intake-side cam cap oil passage formed in the cam cap and an intake camshaft oil passage formed in the intake camshaft; an exhaust-side hydraulic control valve oil passage that supplies oil from the main oil passage to an exhaust-side hydraulic control valve through an exhaust-side cam cap oil passage provided in the cam cap and an exhaust camshaft oil passage provided in the exhaust camshaft; and a hydraulic sensor attached to the cylinder head. the intake side cam cap oil passage is disposed on the opposite side of the intake side bearing to the exhaust side bearing, the exhaust side cam cap oil passage is disposed between the intake side bearing and the exhaust side bearing, the intake side hydraulic control valve oil passage is disposed in the end wall and has an intake side head oil passage branching off from the main oil passage and communicating with the intake side cam cap oil passage, the exhaust side hydraulic control valve oil passage is disposed in the end wall and has an exhaust side head oil passage branching off from the main oil passage and communicating with the exhaust side cam cap oil passage, and the lash adjuster oil passage communicates with the exhaust side cam cap oil passage by a connecting oil passage,An oil pressure sensor is installed in the intake head oil passage.

[0022] As a result, the oil passage structure of an internal combustion engine according to one embodiment of the present invention can operate the intake side valve timing adjuster quickly after the internal combustion engine is started, thereby reducing exhaust gas emissions and fuel consumption. EXAMPLES

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an oil passage structure for an internal combustion engine according to the present invention will be described with reference to the drawings. 1 to 9 are diagrams showing an oil passage structure of an internal combustion engine according to one embodiment of the present invention. In Fig. 1 to 9, the up, down, front, back, left and right directions are defined as follows.

[0024] The direction along the crankshaft is the front-to-rear direction of the engine, with the side where the timing chain is located being the front and the opposite side being the rear. The direction along the central axis of the cylinder is the up-down direction of the engine, with the cylinder head side being the top and the opposite side being the bottom. The direction intersecting the crankshaft and central axis of the cylinder is the left-to-right direction of the engine, with the left side of the central axis of the cylinder when looking at the crankshaft from the rear being the left and the right side of the central axis of the cylinder being the right.

[0025] First, the configuration will be described. In Fig. 1, engine 1 includes an engine body 2 and a chain cover 40. Engine body 2 includes a cylinder block 3, a cylinder head 4, a cylinder head cover 5, and an oil pan 6. Engine 1 of this embodiment constitutes an internal combustion engine. Virtual line 55 in Fig. 1 is the boundary between cylinder block 3 and cylinder head 4.

[0026] A plurality of cylinders (not shown) are provided in the cylinder block 3, and the cylinders are arranged side by side in the front-rear direction of the engine 1. The engine 1 is installed so that a central axis 1C of the cylinder extends in the vertical direction.

[0027] Each cylinder houses a piston (not shown), and the pistons are connected to a crankshaft 7 via a connecting rod (not shown). The crankshaft 7 has a central axis of rotation that extends in the front-rear direction, and rotates around the central axis of rotation.

[0028] The pistons reciprocate in the cylinders to rotate the crankshaft 7 via connecting rods. The cylinder head 4 is formed with a plurality of intake ports 4P (one of which is shown in Figs. 8 and 9) and a plurality of exhaust ports (not shown).

[0029] The intake ports 4P are connected to the cylinders and introduce intake air into the cylinders. The exhaust manifold is connected to multiple cylinders through exhaust ports, collects exhaust gas from the multiple cylinders, and discharges it from an exhaust port to a catalytic converter (not shown).

[0030] 3 and 5, the cylinder head 4 has a front wall 4A and an intake side wall 4B. The front wall 4A is provided at the front end (end) in the axial direction of the crankshaft 7, and the intake side wall 4B is provided on the right side (side) of the cylinder head 4 in the width direction perpendicular to the axial direction of the crankshaft 7. The front wall 4A in this embodiment constitutes an end wall.

[0031] An intake manifold 9 (shown by phantom lines in Figs. 1 and 6) is attached to the intake side wall 4B of the cylinder head 4. The intake manifold 9 distributes the air that has been purified by an air cleaner (not shown) and then sucked into an intake pipe (not shown) to each intake port 4P of the cylinder head 4.

[0032] A valve train chamber 19 is formed inside the cylinder head 4 and the cylinder head cover 5, and an intake camshaft 11 and an exhaust camshaft 12 are rotatably supported in the cylinder head 4 (see FIG. 2).

[0033] As shown in FIG. 2, the intake camshaft 11 and the exhaust camshaft 12 are arranged side by side in the left-right direction of the engine 1 such that their rotational central axes 11a, 12a extend parallel to the front-rear direction of the engine 1.

[0034] The intake camshaft 11 is provided with a plurality of intake cams 11A (two in the figure), and the intake cams 11A are arranged side by side in the direction of the rotation center axis 11a of the intake camshaft 11.

[0035] For example, two intake cams 11A are provided for one cylinder. An intake valve (not shown) is provided in the intake port 4P, and the intake cam 11A operates the intake valve to open and close the intake port 4P, thereby connecting or blocking communication between the cylinder and the intake port 4P.

[0036] The exhaust camshaft 12 is provided with a plurality of exhaust cams 12A (two in the figure), and the exhaust cams 12A are arranged side by side in the direction of a rotational center axis 12a of the exhaust camshaft 12. Hereinafter, the direction of the rotational center axes 11a, 12a will be referred to as the axial direction.

[0037] For example, two exhaust cams 12A are provided for one cylinder. An exhaust valve (not shown) is provided in the exhaust port, and the exhaust cam 12A operates the exhaust valve to open and close the exhaust port, thereby connecting or blocking the cylinder and the exhaust port.

[0038] 2, an intake cam cap 13A, an exhaust cam cap 13B, and a cam cap 14 are attached to the top surface of the cylinder head 4. The intake cam cap 13A and the exhaust cam cap 13B are respectively installed between the intake cams 11A and the exhaust cams 12A provided for each cylinder in the axial direction of the intake camshaft 11 and the exhaust camshaft 12.

[0039] An intake cam bearing surface and an exhaust cam bearing surface (not shown) are provided on the inner peripheral surfaces of the intake cam cap 13A and the exhaust cam cap 13B. An intake cam bearing surface and an exhaust cam bearing surface (not shown) are provided on the upper surface of the cylinder head 4 facing the intake cam bearing surface and the exhaust cam bearing surface.

[0040] The intake cam cap 13A and the exhaust cam cap 13B are fixed to the upper surface of the cylinder head 4 by bolts 33A. The intake camshaft 11 is rotatably supported by the intake cam bearing surface of the intake cam cap 13A and the intake cam bearing surface of the cylinder head 4.

[0041] The exhaust cam shaft 12 is rotatably supported by an exhaust cam bearing surface of an exhaust cam cap 13B and an exhaust cam bearing surface of the cylinder head 4.

[0042] As shown in Figures 5 and 6, an intake side bearing surface 4a and an exhaust side bearing surface 4b are provided on the upper surface of the front wall 4A. As shown in Figure 7, an intake side bearing surface 14a and an exhaust side bearing surface 14b are provided on the inner circumferential surface of the cam cap 14.

[0043] The intake camshaft 11 is rotatably supported by the intake side bearing surface 4a of the front wall 4A and the intake side bearing surface 14a of the cam cap 14, and the exhaust camshaft 12 is rotatably supported by the exhaust side bearing surface 4b of the front wall 4A and the exhaust side bearing surface 14b of the cam cap 14.

[0044] In this embodiment, the intake side bearing surface 4 a and the intake side bearing surface 14 a form an intake side bearing portion 17 , and the exhaust side bearing surface 4 b and the exhaust side bearing surface 14 b form an exhaust side bearing portion 18 .

[0045] As shown in FIGS. 2 and 7, the cam cap 14 is fixed to the upper surface of the front wall 4A of the cylinder head 4 by bolts 33B.

[0046] 5 and 6, bolt attachment bosses 31, 32 are provided on the upper end of the front wall 4A of the cylinder head 4. The bolt attachment bosses 31, 32 are provided on both sides of the intake side bearing 17 (both sides in the left-right direction of the engine 1), and the intake side bearing 17 is formed between the bolt attachment bosses 31, 32 in the left-right direction of the engine 1.

[0047] The inner peripheral surfaces of the bolt attachment bosses 31, 32 are formed with thread grooves 31a, 32a into which the bolt 33B is screwed.

[0048] Bolt attachment bosses 33, 34 are provided at the upper end of the front wall 4A of the cylinder head 4. The bolt attachment bosses 33, 34 are installed on both sides of the exhaust-side bearing 18 (both sides in the left-right direction of the engine 1), and the exhaust-side bearing 18 is formed between the bolt attachment bosses 33, 34 in the left-right direction of the engine 1.

[0049] The bolt attachment bosses 33, 34 have thread grooves 33a, 34a formed on their inner circumferential surfaces into which the bolt 33B is screwed.

[0050] 2, bosses 14A, 14B, 14C, and 14D into which bolt 33B is inserted are provided on cam cap 14. Cam cap 14 is attached to the upper surface of front wall 4A by threading bolt 33B through bosses 14A, 14B, 14C, and 14D into thread grooves 31a, 32a, 33a, and 34a.

[0051] 2 and 3, an intake-side valve timing controller 15 is attached to the axial front end (end) of the intake camshaft 11. The intake-side valve timing controller 15 has an intake-side housing member 23, and an intake sprocket 23S is provided on the outer periphery of the intake-side housing member 23.

[0052] 2, an exhaust-side valve timing adjuster 16 is attached to the axial front end (end) of the exhaust camshaft 12. The exhaust-side valve timing adjuster 16 has an exhaust-side housing member 24, and an exhaust sprocket 24S is provided on the outer periphery of the exhaust-side housing member 24.

[0053] The length of the intake side housing member 23 in the axial direction of the intake camshaft 11 and the exhaust camshaft 12 is formed to be longer than the length of the exhaust side housing member 24 .

[0054] 1, a crank sprocket 7S is provided at the front end of the crankshaft 7. A timing chain 8 is wound around the crank sprocket 7S, the intake sprocket 23S, and the exhaust sprocket 24S.

[0055] Power of the crankshaft 7 is transmitted to an intake camshaft 11 and an exhaust camshaft 12 via a timing chain 8. As a result, the intake camshaft 11 rotates, causing the intake cam 11A to open and close the intake valve, and the exhaust camshaft 12 rotates, causing the exhaust cam 12A to open and close the exhaust valve.

[0056] The intake valve timing controller 15 adjusts the relative rotational phase of the intake camshaft 11 with respect to the crankshaft 7, and adjusts the opening and closing timing (valve timing) of the intake valve.

[0057] An exhaust-side valve timing controller 16 adjusts the relative rotational phase of the exhaust camshaft 12 with respect to the crankshaft 7, and adjusts the opening and closing timing (valve timing) of the exhaust valve.

[0058] 1, an oil pump 35 is provided in the cylinder block 3. The oil pump 35 is driven by the crankshaft 7 to supply oil stored in the oil pan 6 to each part of the engine 1. The oil pump 35 in this embodiment constitutes a hydraulic source.

[0059] A chain cover 40 is attached to the front end portion (end portion) of the cylinder block 3 and the front end portion (end portion) of the cylinder head 4 .

[0060] The chain cover 40 is formed such that the vertical direction of the chain cover 40 is longer than the horizontal direction of the chain cover 40, so that the longitudinal direction is along the vertical direction of the engine 1 and the transverse direction is along the left and right direction of the engine 1. As shown in Figures 1 to 3, the chain cover 40 has a vertical wall 40A, a left side wall 40B and a right side wall 40C.

[0061] The vertical wall 40A faces the front ends of the cylinder block 3 and the cylinder head 4 in the axial direction of the intake camshaft 11 and the exhaust camshaft 12.

[0062] The left side wall 40B and the right side wall 40C protrude from the left and right ends of the chain cover 40 in the short side direction (left and right direction of the chain cover 40) toward the engine body 2, and their tips in the protruding direction are fastened to the front end of the cylinder block 3 and the front end of the cylinder head 4 by multiple bolts 33A (see FIG. 1). In this way, the chain cover 40 is fixed to the engine body 2.

[0063] As shown in FIG. 2, a chain chamber 20 is formed between the cylinder block 3 and the cylinder head 4 and the chain cover 40, and the chain chamber 20 houses the timing chain 8, the intake side valve timing adjuster 15, and the exhaust side valve timing adjuster 16.

[0064] 2, 3 and 5, the timing chain 8 is indicated by phantom lines. The chain cover 40 of this embodiment constitutes a cover member.

[0065] As shown in Figures 1 and 2, an intake side vertical wall portion 41A and an exhaust side vertical wall portion 41B are provided on the upper part of the vertical wall 40A of the chain cover 40, and the intake side vertical wall portion 41A and the exhaust side vertical wall portion 41B are arranged in parallel in the width direction (short side direction) of the chain cover 40.

[0066] The intake side vertical wall portion 41A faces the intake side valve timing control device 15 in the axial direction of the intake camshaft 11 and covers the intake side valve timing control device 15.

[0067] The exhaust side vertical wall portion 41B faces the exhaust side valve timing control device 16 in the axial direction of the exhaust camshaft 12 and covers the exhaust side valve timing control device 16.

[0068] The exhaust side vertical wall portion 41B is recessed toward the engine body 2 with respect to the intake side vertical wall portion 41A. That is, the exhaust side vertical wall portion 41B is recessed toward the engine body 2 with respect to the intake side vertical wall portion 41A, and the intake side vertical wall portion 41A bulges away from the engine body 2 with respect to the exhaust side vertical wall portion 41B.

[0069] The intake side vertical wall portion 41A and the exhaust side vertical wall portion 41B are connected by a step portion 41C having a step in the axial direction of the intake camshaft 11. In other words, the intake side vertical wall portion 41A and the exhaust side vertical wall portion 41B are separated from each other in the axial direction of the intake camshaft 11 and the exhaust camshaft 12 by the step portion 41C.

[0070] 4, an intake side vane rotor 23A is accommodated inside the intake side housing member 23, and the intake side vane rotor 23A rotates integrally with the intake camshaft 11. The intake side vane rotor 23A divides the inside of the intake side housing member 23 into a plurality of advance angle chambers and a plurality of retard angle chambers (not shown).

[0071] The intake side valve timing controller 15 is provided with an intake side spool valve 25 . The intake spool valve 25 is disposed on the rotational center axis 11a of the intake camshaft 11, rotates integrally with the intake camshaft 11, and has a valve body that is movable in the axial direction of the intake camshaft 11.

[0072] As shown in Fig. 1, an intake side solenoid 52 is provided on the intake side vertical wall portion 41A of the chain cover 40. As shown in Fig. 4, the intake side solenoid 52 is attached to the intake side vertical wall portion 41A so as to face the intake side spool valve 25 in the axial direction of the intake camshaft 11.

[0073] The intake side solenoid 52 operates the intake side spool valve 25 so that the valve body of the intake side spool valve 25 moves in the axial direction of the intake camshaft 11.

[0074] When the intake solenoid 52 moves the valve body of the intake spool valve 25 to a position on the advance chamber side in the axial direction of the intake camshaft 11, oil is supplied from the oil pump 35 to the advance chamber. The oil passage from the oil pump 35 to the intake valve timing controller 15 will be described later.

[0075] When oil is supplied to the advance chamber, the intake side vane rotor 23A rotates relative to the intake side housing member 23, thereby adjusting the relative rotational phase of the intake camshaft 11 to the crankshaft 7 to the advance side, and adjusting the opening and closing timing of the intake valve to the advance side.

[0076] When the intake solenoid 52 moves the valve element of the intake spool valve 25 to a position on the retard chamber side in the axial direction of the intake camshaft 11, oil supplied from the oil pump 35 is supplied to the retard chamber.

[0077] When oil is supplied to the retard chamber, the intake side vane rotor 23A rotates relative to the intake side housing member 23, thereby adjusting the relative rotational phase of the intake camshaft 11 to the crankshaft 7 to the retard side, and adjusting the opening and closing timing of the exhaust valve to the retard side.

[0078] In this manner, the intake spool valve 25 and the intake solenoid 52 of this embodiment operate the intake valve timing adjuster 15 by oil, and adjust the relative rotational phase of the intake camshaft 11 with respect to the crankshaft 7.

[0079] The intake side spool valve 25 of this embodiment constitutes an intake side hydraulic control valve. The intake side housing member 23 and the intake side vane rotor 23A are installed on the outer periphery of the intake side spool valve 25 and constitute an intake side actuator that adjusts the relative rotation phase of the intake camshaft 11 with respect to the crankshaft 7 by oil supplied from the intake side spool valve 25.

[0080] An exhaust-side vane rotor 24A is housed inside the exhaust-side housing member 24, and the exhaust-side vane rotor 24A rotates integrally with the exhaust camshaft 12. The exhaust-side vane rotor 24A divides the inside of the exhaust-side housing member 24 into a plurality of advance chambers and a plurality of retard chambers (not shown).

[0081] 4, the exhaust side valve timing controller 16 is provided with an exhaust side spool valve 26. The exhaust side spool valve 26 is installed on the rotational center axis 12a of the exhaust camshaft 12, rotates integrally with the exhaust camshaft 12, and has a valve body that is movable in the axial direction of the exhaust camshaft 12.

[0082] As shown in Fig. 1, an exhaust-side solenoid 53 is provided on the exhaust-side vertical wall portion 41B of the chain cover 40. As shown in Fig. 4, the exhaust-side solenoid 53 is attached to the exhaust-side vertical wall portion 41B so as to face the exhaust-side spool valve 26 in the axial direction of the exhaust camshaft 12.

[0083] The exhaust spool valve 26 is operated by the exhaust solenoid 53 to supply oil to either the advance chamber or the retard chamber, similar to the intake valve timing controller 15. This adjusts the relative rotational phase of the exhaust camshaft 12 with respect to the crankshaft 7 to the advance or retard side, and adjusts the opening and closing timing of the exhaust valve to the advance or retard side.

[0084] The exhaust-side spool valve 26 of this embodiment constitutes an exhaust-side hydraulic control valve. The exhaust-side housing member 24 and the exhaust-side vane rotor 24A are installed on the outer periphery of the exhaust-side spool valve 26, and constitute an exhaust-side actuator that adjusts the relative rotation phase of the exhaust camshaft 12 with respect to the crankshaft 7 by oil supplied from the exhaust-side spool valve 26.

[0085] As shown in FIGS. 1 and 3, a mount attachment portion 44 is provided on the upper portion of the vertical wall 40A of the chain cover 40.

[0086] The mount attachment portion 44 is located below the intake side vertical wall portion 41A and the exhaust side vertical wall portion 41B, and bulges out in a direction away from the engine body 2 (forward) relative to the chain cover 40.

[0087] As shown in FIG. 3, a side member 10 is provided in front of the engine 1, and the side member 10 extends in the front-rear direction.

[0088] An attachment seat 44a is provided at the tip of the mount attachment portion 44, and as shown in Figures 2 and 4, bolt holes 44b, 44c, and 44d are formed in the attachment seat 44a, into which bolts serving as fasteners (not shown) are fastened.

[0089] 3, a mount member 51 is attached to the attachment seat 44a. The mount member 51 includes a mount bracket 51A, and a bolt is inserted into the rear end of the mount bracket 51A.

[0090] The bolts inserted into the rear end portion of the mount bracket 51A are fastened to the bolt holes 44b, 44c, and 44d, thereby fixing the rear end portion of the mount bracket 51A to the attachment seat 44a.

[0091] The mount member 51 includes a vibration absorbing member 51B, which is attached to the side member 10. The front end of the mount bracket 51A is attached to the vibration absorbing member 51B, and the engine body 2 is elastically supported by the side member 10 via the mount member 51.

[0092] This allows the mount member 51 to absorb vibrations of the engine 1, thereby suppressing vibrations transmitted from the engine 1 to the side member 10. As shown in Figures 6 and 7, an oil passage 61 is provided in the front wall 4A of the cylinder head 4.

[0093] The oil passage 61 has a main oil passage 62, an intake side head oil passage 63, an exhaust side head oil passage 64, an intake side cam cap oil passage 65, an exhaust side cam cap oil passage 66, an intake camshaft oil passage 67, and an exhaust camshaft oil passage 68.

[0094] The main oil passage 62 extends linearly in the vertical direction from the lower surface to the upper surface of the cylinder head 4, and oil is supplied to the main oil passage 62 from the oil pump 35. The upstream side of the main oil passage 62 communicates with a block-side oil passage (not shown) provided in the cylinder block 3, and the block-side oil passage guides oil discharged from the oil pump 35 to the main oil passage 62. Here, upstream and downstream refer to the upstream and downstream with respect to the direction in which the oil flows.

[0095] The intake side head oil passage 63 branches off from the main oil passage 62 and reaches the upper surface of the front wall 4A. Specifically, as shown in Fig. 7, the intake side head oil passage 63 has a first intake side head oil passage 63A extending linearly from a branching portion 62a of the main oil passage 62 toward the intake side wall 4B, and a second intake side head oil passage 63B extending linearly upward from an outer end portion 63a in the extending direction of the first intake side head oil passage 63A and reaching the intake side cam cap inner oil passage 65.

[0096] The exhaust-side head oil passage 64 branches off from a branching portion 62a of the main oil passage 62, extends upward in a straight line from the branching portion 62a, and reaches the upper surface of the front wall 4A. That is, the exhaust-side head oil passage 64 is formed coaxially with the main oil passage 62, and the exhaust-side head oil passage 64 and the main oil passage 62 extend vertically in a straight line.

[0097] The main oil passage 62 in the cylinder head 4 is made up of an oil passage extending from the lower end of the front wall 4A to a branching portion 62a where an intake side head oil passage 63 and an exhaust side head oil passage 64 branch off.

[0098] In this manner, the main oil passage 62 and the exhaust-side head oil passage 64 in this embodiment extend linearly upward from below the exhaust-side cam cap oil passage 66 toward the exhaust-side cam cap oil passage 66 .

[0099] The intake-side cam cap oil passage 65 is provided inside the cam cap 14, and connects the second intake-side head oil passage 63B and the intake camshaft oil passage 67. The intake camshaft oil passage 67 is provided inside the end of the intake camshaft 11, and connects the second intake-side head oil passage 63B and the oil passage of the intake-side spool valve 25.

[0100] The intake side spool valve 25 is controlled by the intake side solenoid 52 to supply oil from an oil passage 67 in the intake camshaft to an advance chamber or a retard chamber of the intake side valve timing controller 15 .

[0101] The exhaust-side cam cap oil passage 66 is provided inside the cam cap 14, and connects the exhaust-side head oil passage 64 and the exhaust camshaft oil passage 68. The exhaust camshaft oil passage 68 is provided inside the end of the exhaust camshaft 12, and connects the exhaust-side head oil passage 64 and the oil passage of the exhaust-side spool valve 26.

[0102] The exhaust spool valve 26 is controlled by the exhaust solenoid 53 to supply oil from an oil passage 68 in the exhaust camshaft to an advance chamber or a retard chamber of the exhaust valve timing controller 16 .

[0103] The intake side cam cap oil passage 65 is arranged next to the exhaust side cam cap oil passage 66 in the left-right direction of the engine 1, and is arranged on the opposite side of the intake side bearing 17 to the exhaust side bearing 18.

[0104] That is, the oil passage 65 inside the intake side cam cap is located on the intake side wall 4B side relative to the intake side bearing 17, and the oil passage 66 inside the exhaust side cam cap is located between the intake side bearing 17 and the exhaust side bearing 18.

[0105] The intake side cam cap oil passage 65 and the exhaust side cam cap oil passage 66 are installed side by side in the left-right direction of the engine 1 at the same height position, and the length of the intake side cam cap oil passage 65 in the left-right direction of the engine 1 is shorter than the length of the exhaust side cam cap oil passage 66 in the left-right direction of the engine 1.

[0106] In this embodiment, the intake side head oil passage 63, the intake side cam cap oil passage 65, and the intake camshaft oil passage 67 form oil passages for the intake side hydraulic control valve, and the exhaust side head oil passage 64, the exhaust side cam cap oil passage 66, and the exhaust camshaft oil passage 68 form oil passages for the exhaust / intake side hydraulic control valve.

[0107] 7 and 9, a sensor mounting boss 69 is provided in the second intake side head oil passage 63B, and a sensor hole 69a is provided inside the sensor mounting boss 69. An oil pressure sensor 70 is inserted into the sensor hole 69a, and the oil pressure sensor 70 is attached to the sensor mounting boss 69. In other words, the oil pressure sensor 70 is attached to the first intake side head oil passage 63A.

[0108] The oil pressure sensor 70 detects the pressure (oil pressure) of the oil flowing through the second intake head oil passage 63B, and transmits a signal to a controller (not shown).

[0109] The controller controls the intake solenoid 52 and the exhaust solenoid 53 based on the hydraulic sensor 70 to adjust the relative rotation phase of the intake camshaft 11 with respect to the crankshaft 7 and the relative rotation phase of the exhaust camshaft 12 with respect to the crankshaft 7 .

[0110] As shown in FIG. 6, the second intake side head oil passage 63B has an upper end portion 63b located on the intake side wall 4B side with respect to the bolt attachment bosses 31, 32.

[0111] As shown in Figure 5, the second intake side head oil passage 63B is located on the opposite side of the intake side valve timing adjuster 15 from the bolt mounting bosses 31, 32 in the axial direction of the intake camshaft 11, and is adjacent to the bolt mounting boss 31 in the left-right direction of the engine 1.

[0112] As shown in Figures 6 and 7, the second intake side head oil passage 63B is inclined so as to approach the intake side wall 4B as it approaches the lower end 63c from the upper end 63b, and extends diagonally upward to the left from the outer end 63a of the first intake side head oil passage 63A toward the intake side bearing 17.

[0113] As shown in Figures 6 and 8, the bolt mounting bosses 31, 32 bulge out from the front wall 4A toward the intake side valve timing adjuster 15 in the axial direction of the intake camshaft 11, and a space 71 is formed below the bolt mounting bosses 31, 32.

[0114] As shown in FIG. 6, the sensor hole portion 69a protrudes toward the bolt mounting bosses 31, 32 side from the outer wall 63d of the second intake side head oil passage 63B, and extends toward the bolt mounting bosses 31, 32 side further than the second intake side head oil passage 63B.

[0115] A space 71 is formed between the sensor mounting boss 69 and the bolt mounting bosses 31, 32, and the sensor mounting boss 69 bulges into the space 71 from the second intake head oil passage 63B.

[0116] 6 and 7, front wall 4A is provided with first communication oil passage 72, second communication oil passage 73, intake side lash adjuster oil passage 74, and exhaust side lash adjuster oil passage 75. In this embodiment, intake side lash adjuster oil passage 74 and exhaust side lash adjuster oil passage 75 constitute lash adjuster oil passages.

[0117] The first communication oil passage 72 communicates between the exhaust-side cam cap oil passage 66 and the intake-side lash adjuster oil passage 74. The intake-side lash adjuster oil passage 74 extends in the front-rear direction of the cylinder head 4, and supplies operating oil to the intake-side lash adjuster 36A (see FIG. 5).

[0118] The second communication oil passage 73 communicates between the exhaust-side cam cap oil passage 66 and the exhaust-side lash adjuster oil passage 75. The exhaust-side lash adjuster oil passage 75 extends in the front-to-rear direction of the cylinder head 4 in parallel with the intake-side lash adjuster oil passage 74, and supplies operating oil to the exhaust-side lash adjuster 36B (see FIG. 5).

[0119] 2 and 4, the intake side lash adjuster 36A is disposed near the intake camshaft 11. Specifically, the intake side lash adjuster 36A is disposed closer to the intake camshaft 11 than to the exhaust camshaft 12.

[0120] An intake side rocker arm (not shown) is installed on the cylinder head 4. The intake side rocker arm is pressed and swung by the intake cam 11A. The intake side lash adjuster 36A supports one end of the intake side rocker arm and adjusts the valve clearance (clearance between the intake side rocker arm and the intake valve (not shown)) by hydraulic pressure.

[0121] The exhaust-side lash adjuster 36B is disposed in the vicinity of the exhaust camshaft 12. Specifically, the exhaust-side lash adjuster 36B is disposed closer to the exhaust camshaft 12 than to the intake camshaft 11.

[0122] An exhaust side rocker arm (not shown) is installed on the cylinder head 4. The exhaust side rocker arm is pressed by the exhaust cam 12A to swing. The exhaust side lash adjuster 36B supports one end of the exhaust side rocker arm and adjusts the valve clearance (clearance between the exhaust side rocker arm and the exhaust valve (not shown)) by hydraulic pressure.

[0123] 6 and 7, exhaust-side head oil passage 64 runs from main oil passage 62 between intake-side lash adjuster oil passage 74 and exhaust-side lash adjuster oil passage 75, and reaches exhaust-side cam cap oil passage 66. In other words, exhaust-side head oil passage 64 is sandwiched between intake-side lash adjuster oil passage 74 and exhaust-side lash adjuster oil passage 75 on both left and right sides of engine 1.

[0124] Next, the effect of the oil passage structure of the engine 1 according to this embodiment will be described. The oil passage structure of engine 1 in this embodiment is provided in front wall 4A of cylinder head 4 and includes a main oil passage 62 to which oil is supplied from oil pump 35, and an intake side lash adjuster oil passage 74 and an exhaust side lash adjuster oil passage 75 which supply oil from the main oil passage 62 to intake side lash adjuster 36A and exhaust side lash adjuster 36B.

[0125] In addition, the oil passage structure of the engine 1 of this embodiment has an oil passage for the intake side hydraulic control valve that includes an intake side head oil passage 63 that supplies oil to the intake side spool valve 25 from the main oil passage 62 through an intake side cam cap oil passage 65 formed in the cam cap 14 and an intake camshaft oil passage 67 formed in the intake camshaft 11.

[0126] Furthermore, the oil passage structure of the engine 1 of this embodiment has an oil passage for the exhaust side hydraulic control valve, including an exhaust side head oil passage 64 that supplies oil to the exhaust side spool valve 26 from the main oil passage 62 through an exhaust side cam cap oil passage 66 formed in the cam cap 14 and an exhaust camshaft oil passage 68 provided in the exhaust camshaft 12.

[0127] The oil passage 65 in the intake side cam cap is located on the opposite side of the exhaust side bearing 18 from the intake side bearing 17, and the oil passage 66 in the exhaust side cam cap is located between the intake side bearing 17 and the exhaust side bearing 18.

[0128] The intake side head oil passage 63 branches off from the main oil passage 62 and communicates with an intake side cam cap oil passage 65, and the exhaust side head oil passage 64 branches off from the main oil passage 62 and communicates with an exhaust side cam cap oil passage 66.

[0129] In addition, intake-side lash adjuster oil passage 74 and exhaust-side lash adjuster oil passage 75 are connected to exhaust-side cam cap oil passage 66 by first connecting oil passage 72 and second connecting oil passage 73, respectively, and an oil pressure sensor 70 is attached to the intake-side head oil passage 63.

[0130] In this way, the oil passage structure of engine 1 in this embodiment, since intake side lash adjuster oil passage 74 and exhaust side lash adjuster oil passage 75 are connected to exhaust side cam cap oil passage 66, can at least prevent intake side lash adjuster oil passage 74 from branching off from first intake side head oil passage 63A or second intake side head oil passage 63B.

[0131] Therefore, the oil pressure in the intake head oil passage 63 can be prevented from decreasing due to the supply of oil to the intake lash adjuster oil passage 74 and the exhaust lash adjuster oil passage 75.

[0132] Therefore, after the engine 1 starts, the oil pressure in the intake side head oil passage 63 can be increased more quickly than the oil pressure in the exhaust side head oil passage 64 .

[0133] In addition, since the oil pressure sensor 70 is attached to the intake side head oil passage 63, the oil pressure in the intake side head oil passage 63 formed near the intake side spool valve 25 can be detected, and the oil pressure supplied to the intake side spool valve 25 can be accurately detected.

[0134] Therefore, after the engine 1 starts, the oil pump 35 sends oil to the oil passage 61, and the controller accurately determines when the pressure at the oil pressure sensor 70 has reached a specified pressure, and outputs a drive signal to the intake side solenoid 52 to quickly operate the intake side valve timing control device 15.

[0135] As described above, the oil passage structure of the engine 1 of this embodiment can operate the intake valve timing controller 15 quickly after the engine 1 is started, thereby reducing exhaust gas and fuel consumption.

[0136] According to the oil passage structure of the engine 1 of this embodiment, the cylinder head 4 has an intake side wall 4B provided on a side surface in a width direction perpendicular to the axial direction of the crankshaft 7, to which the intake manifold 9 is connected.

[0137] The intake side head oil passage 63 has a first intake side head oil passage 63A extending from the main oil passage 62 toward the intake side wall 4B, and a second intake side head oil passage 63B extending upward from the outer end portion 63a in the extension direction of the first intake side head oil passage 63A to reach the intake side cam cap inner oil passage 65, and an oil pressure sensor 70 is attached to the second intake side head oil passage 63B.

[0138] This allows the oil pressure sensor 70 to be installed in the second intake side head oil passage 63B, which is installed closer to the intake side cam cap inner oil passage 65 (ie, the intake side spool valve 25) than the first intake side head oil passage 63A.

[0139] Therefore, the oil pressure can be detected by the oil pressure sensor 70 at a position close to the intake spool valve 25, and the oil pressure supplied to the intake spool valve 25 can be detected by the oil pressure sensor 70 more accurately.

[0140] In addition, the oil passage structure of engine 1 in this embodiment includes an intake side lash adjuster oil passage 74 that communicates with exhaust side cam cap oil passage 66 via a first connecting oil passage 72 and supplies oil to intake side lash adjuster 36A, and an exhaust side lash adjuster oil passage 75 that communicates with exhaust side cam cap oil passage 66 via a second connecting oil passage 73 and supplies oil to exhaust side lash adjuster 36B.

[0141] In addition, the exhaust-side head oil passage 64 is formed coaxially with the main oil passage 62 and passes from the main oil passage 62 between the intake-side lash adjuster oil passage 74 and the exhaust-side lash adjuster oil passage 75 to the exhaust-side cam cap oil passage 66.

[0142] This allows the length of the exhaust side head oil passage 64 to be shortened, and the travel distance of the oil flowing through the exhaust side head oil passage 64 to be shortened.

[0143] As a result, after engine 1 is started, oil can be quickly supplied from exhaust side head oil passage 64 to intake side lash adjuster oil passage 74 and exhaust side lash adjuster oil passage 75 via exhaust side cam cap oil passage 66, first connecting oil passage 72, and second connecting oil passage 73.

[0144] As a result, the intake valve timing controller 15 can be operated more quickly after the engine 1 is started, and exhaust gas and fuel consumption can be reduced more effectively.

[0145] Although an embodiment of the invention has been disclosed, it will be apparent to one skilled in the art that modifications may be made without departing from the spirit and scope of the invention, and all such modifications and equivalents are intended to be encompassed by the following claims. [Explanation of symbols]

[0146] 1...engine (internal combustion engine), 4...cylinder head, 4A...front wall (end wall), 4B...intake side wall, 7...crankshaft, 9...intake manifold, 11...intake camshaft, 12...exhaust camshaft, 14...cam cap, 15...intake side valve timing adjustment device, 16...exhaust side valve timing adjustment device, 17...intake side bearing portion, 18...exhaust side bearing portion, 23...intake side housing member (intake side actuator), 23A...intake side vane rotor (intake side actuator), 24...exhaust side housing member (exhaust side actuator), 24A...exhaust side vane rotor (exhaust side actuator), 25...intake side spool valve (intake side hydraulic control valve), 26...exhaust side spool valve (exhaust side hydraulic control valve), 62...main oil passage, 63... intake side head oil passage (oil passage for intake side hydraulic control valve), 63A... first intake side head oil passage, 63a... outer end portion (outer end portion of first intake side head oil passage), 63B... second intake side head oil passage, 64... exhaust side head oil passage (oil passage for exhaust side hydraulic control valve), 65... intake side cam cap internal oil passage (oil passage for intake side hydraulic control valve), 66... ​​exhaust side cam cap internal oil passage (exhaust oil passage for intake camshaft (oil passage for intake hydraulic control valve), 67...oil passage in intake camshaft (oil passage for intake hydraulic control valve), 68...oil passage in exhaust camshaft (oil passage for exhaust hydraulic control valve), 72...first connecting oil passage, 73...second connecting oil passage, 70...oil pressure sensor, 74...oil passage for intake lash adjuster (oil passage for lash adjuster), 75...oil passage for exhaust lash adjuster (oil passage for lash adjuster)

Claims

1. a cylinder head having an end wall provided at an axial end of the crankshaft; a cam cap provided on an upper surface of the end wall; an intake camshaft rotatably supported by an intake side bearing portion formed on an upper surface of the end wall and the cam cap; an exhaust camshaft rotatably supported by an exhaust-side bearing portion formed on an upper surface of the end wall and the cam cap; an intake side valve timing control device including an intake side hydraulic control valve provided at an end of the intake camshaft, and an intake side actuator installed on an outer periphery of the intake side hydraulic control valve and configured to adjust a relative rotation phase of the intake camshaft with respect to the crankshaft by oil supplied from the intake side hydraulic control valve; an exhaust-side valve timing control device including an exhaust-side hydraulic control valve provided at an end of the exhaust camshaft, and an exhaust-side actuator installed on an outer periphery of the exhaust-side hydraulic control valve and configured to adjust a relative rotation phase of the exhaust camshaft with respect to the crankshaft by oil supplied from the exhaust-side hydraulic control valve; a plurality of lash adjusters installed on the cylinder head so as to be located in the vicinity of the intake camshaft and the exhaust camshaft; a main oil passage provided in the end wall and supplied with oil from a hydraulic source; a lash adjuster oil passage that supplies oil from the main oil passage to the plurality of lash adjusters; an intake-side hydraulic control valve oil passage that supplies oil from the main oil passage through an intake-side cam cap oil passage formed in the cam cap and an intake camshaft oil passage formed in the intake camshaft to the intake-side hydraulic control valve; an exhaust-side hydraulic control valve oil passage that supplies oil from the main oil passage through an exhaust-side cam cap oil passage provided in the cam cap and an exhaust camshaft oil passage provided in the exhaust camshaft to the exhaust-side hydraulic control valve; An oil passage structure for an internal combustion engine comprising a hydraulic pressure sensor attached to the cylinder head, the intake-side cam cap oil passage is disposed on an opposite side of the intake-side bearing portion from the exhaust-side bearing portion, the exhaust-side cam cap oil passage is disposed between the intake-side bearing portion and the exhaust-side bearing portion, the intake-side hydraulic control valve oil passage is provided in the end wall, and has an intake-side head oil passage branching from the main oil passage and communicating with the intake-side cam cap oil passage, the exhaust-side hydraulic control valve oil passage is provided in the end wall, and has an exhaust-side head oil passage branching from the main oil passage and communicating with the exhaust-side cam cap oil passage, the lash adjuster oil passage communicates with the exhaust cam cap oil passage via a communication oil passage, 13. An oil passage structure for an internal combustion engine, wherein the oil pressure sensor is attached to the intake head oil passage.

2. the cylinder head has an intake side wall provided on a side surface in a width direction perpendicular to an axial direction of the crankshaft, the intake side wall being connected to an intake manifold; the intake side head oil passage includes a first intake side head oil passage extending from the main oil passage toward the intake side wall, and a second intake side head oil passage extending upward from an outer end of the first intake side head oil passage in an extending direction thereof and reaching the intake side cam cap oil passage, 2. The oil passage structure of an internal combustion engine according to claim 1, wherein the oil pressure sensor is attached to the second intake head oil passage.

3. The communication oil passage includes a first communication oil passage and a second communication oil passage, the lash adjuster includes an intake-side lash adjuster disposed on the intake camshaft side and an exhaust-side lash adjuster disposed on the exhaust camshaft side, the lash adjuster oil passage includes an intake-side lash adjuster oil passage that communicates with the exhaust-side cam cap oil passage via the first communication oil passage and supplies oil to the intake-side lash adjuster, and an exhaust-side lash adjuster oil passage that communicates with the exhaust-side cam cap oil passage via the second communication oil passage and supplies oil to the exhaust-side lash adjuster, 3. An oil passage structure for an internal combustion engine according to claim 1, wherein the exhaust-side head oil passage is formed coaxially with the main oil passage, and extends from the main oil passage through between the intake-side lash adjuster oil passage and the exhaust-side lash adjuster oil passage to the exhaust-side cam cap oil passage.

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