Cam angle sensor mounting structure for internal combustion engine

Abstract

To provide an attachment structure of a cam angle sensor of an internal combustion engine which can suppress the vibration of the cam angle sensor by improving the stiffness of a peripheral part of an attachment point of the cam angle sensor, and can prevent the lowering of the detection accuracy of a rotation angle of a camshaft.SOLUTION: An EGR housing 25 attached to a cylinder head 4 has: an upper wall 25D having attachment boss parts 28A, 28B attached with cam angle sensors, and continuously connected to a front wall 25A, a rear wall 25B and a left sidewall 25C; and a cylindrical EGR passage part 26 provided at the left sidewall 25C side, and having an EGR passage 26a in which an EGR gas flows. The EGR passage part 26 comprises: an EGR gas introduction port 26b provided at the front wall 25A, and introducing an EGR gas into the EGR gas passage 26a; and an EGR gas discharge port 26c provided at the rear wall 25B, and discharging the EGR gas from the EGR passage 26a. The boss attachment parts 28A, 28B are connected to the EGR passage part 26.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a mounting structure for a cam angle sensor in an internal combustion engine. [Background technology]

[0002] BACKGROUND ART Cam angle sensors are known that detect the rotational positions (rotational angles) of intake camshafts and exhaust camshafts in engines mounted on vehicles.

[0003] A known conventional mounting structure for a cam angle sensor in an engine is one in which the cam angle sensor (TDC sensor) is mounted on a cylinder head cover that covers the top of the cylinder head.

[0004] According to this cam angle sensor mounting structure, the cam angle sensor is mounted externally to the front surface and the rear top surface of the cylinder head cover with bolts so as not to interfere with the hood, which slopes downward at the front. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-37835 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional mounting structure of the cam angle sensor, the cam angle sensor is mounted on a flat portion of the cylinder head cover.

[0007] The flat portion of the cylinder head cover has a large area and low surface rigidity, so the cam angle sensor is likely to vibrate due to engine vibration, which may reduce the detection accuracy of the intake camshaft and exhaust camshaft.

[0008] The present invention has been made in light of the above-mentioned circumstances, and aims to provide a mounting structure for a cam angle sensor of an internal combustion engine that improves the rigidity around the mounting location of the cam angle sensor, thereby suppressing vibration of the cam angle sensor and preventing a decrease in detection accuracy of the rotation angle of the camshaft. [Means for solving the problem]

[0009] The present invention provides a mounting structure for a cam angle sensor for an internal combustion engine, the mounting structure including a cylinder head having an intake sidewall with an air intake port for drawing in intake air and an exhaust sidewall in which an exhaust gas outlet port for discharging exhaust gas is formed, a camshaft extending along a cylinder row direction and rotatably supported by the cylinder head, a cylinder head cover and an EGR housing part attached to the cylinder head so as to cover an upper part of the cylinder head, and a cam angle sensor for detecting a rotation angle of the camshaft, wherein the EGR housing part has a first sidewall located on the exhaust sidewall side of the cylinder head, a second sidewall located on the intake sidewall side of the cylinder head, and the first sidewall. a third side wall connecting an end of the first side wall in the cylinder row direction to an end of the second side wall in the cylinder row direction; an upper wall connected to an upper end of the first side wall, an upper end of the second side wall, and an upper end of the third side wall; and a cylindrical EGR passage portion provided on the third side wall and having an EGR passage through which EGR gas flows, the EGR passage portion having an EGR gas inlet port provided on the first side wall for introducing EGR gas into the EGR passage and an EGR gas outlet port provided on the second side wall for discharging EGR gas from the EGR passage, and the mounting boss portion is connected to the EGR passage portion. [Effects of the Invention]

[0010] As described above, according to the present invention, the rigidity around the mounting location of the cam angle sensor is improved, thereby suppressing vibration of the cam angle sensor and preventing a decrease in the detection accuracy of the camshaft rotation angle. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a left side view of an internal combustion engine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of a cylinder head and a cylinder head cover of an internal combustion engine according to one embodiment of the present invention. [Figure 3] FIG. 3 is a left side view of the cylinder head and cylinder head cover of the internal combustion engine according to one embodiment of the present invention. [Figure 4] FIG. 4 is a plan view of an internal combustion engine according to an embodiment of the present invention, showing a state in which the cylinder head cover has been removed. [Figure 5] FIG. 5 is a plan view of an EGR housing portion of an internal combustion engine according to one embodiment of the present invention. [Figure 6] FIG. 6 is a plan view of an EGR housing portion of an internal combustion engine according to one embodiment of the present invention, showing a state in which the intake cam angle sensor and the exhaust cam angle sensor have been removed. [Figure 7] 7 is a cross-sectional view taken along the line VII-VII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] A mounting structure for a cam angle sensor for an internal combustion engine according to one embodiment of the present invention is a mounting structure for a cam angle sensor for an internal combustion engine, which includes a cylinder head having an intake side wall with an air intake port for drawing in intake air and an exhaust side wall in which an exhaust gas outlet port for discharging exhaust gas is formed, a camshaft extending along the cylinder row direction and rotatably supported by the cylinder head, a cylinder head cover and an EGR housing part attached to the cylinder head so as to cover an upper part of the cylinder head, and a cam angle sensor that detects the rotation angle of the camshaft, wherein the EGR housing part has a first side wall located on the exhaust side wall side of the cylinder head and a second side wall of the cylinder head. the cylinder head includes a second side wall located on the intake side wall side; a third side wall connecting the end of the first side wall in the cylinder row direction to the end of the second side wall in the cylinder row direction; an upper wall having a cylindrical mounting boss portion on which a cam angle sensor is mounted and connected to the upper end of the first side wall, the upper end of the second side wall, and the upper end of the third side wall; and a cylindrical EGR passage portion provided on the third side wall side and having an EGR passage through which EGR gas flows, the EGR passage portion having an EGR gas inlet port provided on the first side wall for introducing EGR gas into the EGR passage and an EGR gas outlet port provided on the second side wall for discharging EGR gas from the EGR passage, and the mounting boss portion is connected to the EGR passage portion.

[0013] As a result, the mounting structure for a cam angle sensor in an internal combustion engine according to one embodiment of the present invention improves the rigidity around the mounting location of the cam angle sensor, suppressing vibration of the cam angle sensor and preventing a decrease in the detection accuracy of the camshaft rotation angle. [Example]

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mounting structure for a cam angle sensor in an internal combustion engine according to an embodiment of the present invention will now be described with reference to the drawings.

[0015] 1 to 7 are diagrams showing a mounting structure of a cam angle sensor for an internal combustion engine according to one embodiment of the present invention. In Fig. 1 to 7, the up, down, front, back, left, and right directions are based on the internal combustion engine installed in a vehicle, and the front and back direction of the vehicle is defined as the front-back direction, the left and right direction of the vehicle (vehicle width direction) is defined as the left and right direction, and the up and down direction of the vehicle (vehicle height direction) is defined as the up and down direction.

[0016] First, the configuration will be described. 1, an engine 1 is provided in an engine room (not shown) of a vehicle. The engine 1 includes an engine body 2 and a chain cover 10 (see FIG. 4).

[0017] The engine body 2 has a cylinder block 3, a cylinder head 4, a cylinder head cover 5, and an oil pan 6, and a chain cover 10 is connected to the right end of the engine body 2. The engine 1 of this embodiment constitutes an internal combustion engine.

[0018] The cylinder block 3 is provided with a plurality of cylinders 3A (shown by imaginary lines in FIG. 4), and the cylinders 3A are arranged in the vehicle width direction. Hereinafter, the arrangement direction of the cylinders 3A (vehicle width direction) will be referred to as cylinder row direction A.

[0019] Although the engine 1 of this embodiment is configured as a three-cylinder engine having three cylinders 3A, the number of cylinders is not limited to three.

[0020] Each cylinder 3A houses a piston (not shown), and the piston is connected to a crankshaft 7 via a connecting rod (not shown) (see FIG. 1). The crankshaft 7 has a central axis of rotation extending in the vehicle width direction and rotates around the central axis of rotation. The engine 1 of this embodiment is a transversely mounted engine with the crankshaft 7 extending in the vehicle width direction, and the vehicle is a FF (front engine, front drive) vehicle.

[0021] The pistons reciprocate within the cylinders 3A, thereby rotating the crankshaft 7 via connecting rods. The cylinder head 4 is formed with a plurality of intake ports 4a (see FIG. 4) and exhaust collection sections 4b (see FIG. 3), both not shown.

[0022] The intake ports 4a are connected to the cylinders 3A, respectively, and introduce intake air into the cylinders 3A. The exhaust collection section 4b is connected to the cylinders 3A via a plurality of exhaust ports (not shown).

[0023] That is, the exhaust ports extend from each cylinder 3A to the exhaust confluence portion 4b, and the exhaust confluence portion 4b confluences the exhaust ports.

[0024] As shown by the imaginary lines in FIG. 2, the cylinder head 4 is provided with a cooling water passage 20, which extends from the right end to the left end of the cylinder head 4.

[0025] Cooling water is introduced into the right end of the cooling water passage 20 from a cooling water passage (not shown) formed in the cylinder block 3. The cooling water introduced into the cooling water passage 20 flows leftward along the cooling water passage 20. In this way, the cylinder head 4 is cooled by the cooling water. The cooling water passage 20 of this embodiment constitutes a cooling water passage.

[0026] As shown in FIG. 4, the cylinder head 4 has an intake side wall 4A where the intake port 4a opens, and an exhaust side wall 4B located on the opposite side (front side) of the intake side wall 4A and where the exhaust collection portion 4b opens.

[0027] As shown in FIG. 3, the cylinder head 4 has a cooling water discharge side wall 4C in which a cooling water discharge port 4c for discharging the cooling water from the cooling water passage 20 is formed, and the cooling water discharge side wall 4C is connected to the left end (end in the cylinder row direction A) of the intake side wall 4A and the left end (end in the cylinder row direction A) of the exhaust side wall 4B, and extends in the front-to-rear direction.

[0028] A cooling water branching unit (not shown) is connected to the cooling water outlet 4c, and the cooling water branching unit is connected to a radiator (not shown) and a cooling water inlet 13A (see Figure 1) of the EGR cooler 13 by a branch pipe (not shown).

[0029] The cooling water discharged from the cooling water outlet 4c is supplied to the radiator and the cooling water inlet 13A of the EGR cooler 13 through a cooling water branch unit and a cooling water pipe.

[0030] In this embodiment, the intake port 4a serves as an air intake port for drawing in intake air, and the exhaust collection section 4b serves as an exhaust gas outlet for discharging exhaust gas. That is, the cylinder head 4 has an intake side wall 4A having the intake port 4a and an exhaust side wall 4B having the exhaust collection section 4b.

[0031] As shown in Figure 1, an intake manifold 8 is attached to the intake side wall 4A. The intake manifold 8 has a surge tank 8A and three branch pipes 8B (one shown) corresponding to the number of cylinders 3A. An intake pipe (not shown) is connected to the surge tank 8A via a throttle body (not shown).

[0032] Intake air purified by an air cleaner (not shown) is introduced into the intake pipe, and the intake air is introduced into a surge tank 8A through a throttle body.

[0033] The throttle body accommodates a throttle valve (not shown), which adjusts the amount of intake air introduced into the surge tank 8A.

[0034] The branch pipes 8B extend from the surge tank 8A to each intake port 4a, and distribute the intake air introduced into the surge tank 8A to each intake port 4a.

[0035] An exhaust purification device 9 is attached to the intake side wall 4A. Exhaust gas burned in the cylinder 3A is discharged from the cylinder 3A through the exhaust port and collected in the exhaust collection section 4b, and then discharged from the exhaust collection section 4b to the exhaust purification device 9.

[0036] The exhaust purification device 9 purifies the exhaust gas discharged from the exhaust collection portion 4b and discharges it into the atmosphere through an exhaust pipe (not shown).

[0037] The engine 1 is provided with an EGR (Exhaust Gas Recirculation) device 11. The EGR device 11 includes an upstream EGR pipe 12, an EGR cooler 13, an EGR valve 14, and a downstream EGR pipe 15.

[0038] The upstream end of the upstream EGR pipe 12 is connected to the exhaust purification device 9, and part of the exhaust gas is introduced as EGR gas from the exhaust purification device 9 into the upstream EGR pipe 12. Here, upstream and downstream refer to the upstream and downstream with respect to the flow direction of intake air, exhaust gas, and EGR gas.

[0039] The EGR valve 14 is located downstream of the upstream EGR pipe 12 , and the upstream EGR pipe 12 is located upstream of the EGR valve 14 .

[0040] The downstream end of the upstream EGR pipe 12 is connected to the upstream end of the EGR cooler 13. The EGR cooler 13 has a cooling water inlet 13A that introduces cooling water into the EGR cooler 13 and a cooling water outlet 13B that discharges cooling water from the EGR cooler 13.

[0041] The EGR cooler 13 cools the EGR gas by exchanging heat between the EGR gas introduced from the upstream EGR pipe 12 and the cooling water.

[0042] The downstream end of the EGR cooler 13 is connected to an EGR valve 14. The EGR valve 14 is attached to an EGR housing portion 25, and adjusts the flow rate of EGR gas flowing through an EGR passage portion 26, which will be described later.

[0043] The upstream end of the downstream EGR pipe 15 is connected to the EGR housing part 25, and the EGR gas introduced into the EGR housing part 25 is discharged to the downstream EGR pipe 15. The downstream end of the downstream EGR pipe 15 is connected to the surge tank 8A, and the EGR gas discharged to the downstream EGR pipe 15 is introduced into the surge tank 8A.

[0044] As shown in Fig. 4, the cylinder head 4 is provided with an intake camshaft 16 and an exhaust camshaft 17, which extend parallel to the cylinder row direction A. The intake camshaft 16 and the exhaust camshaft 17 are provided with a plurality of intake cams 16A and exhaust cams 17A.

[0045] The intake cam 16A and the exhaust cam 17A are spaced apart in the cylinder row direction A, and one pair is provided for each cylinder 3A.

[0046] The intake camshaft 16 and the exhaust camshaft 17 are rotatably supported on the cylinder head 4 by cam caps 18 and 19, respectively.

[0047] Specifically, journal bearings (not shown) are provided on the top surface of the cylinder head 4, facing the cam caps 18 and 19, and the intake camshaft 16 and the exhaust camshaft 17 are rotatably attached to the cylinder head 4 so as to be sandwiched between the journal bearings and the cam caps 18 and 19, respectively. The intake camshaft 16 and the exhaust camshaft 17 in this embodiment constitute camshafts.

[0048] 5 and 6, an EGR housing portion 25 is provided at the end (left end) of the cylinder head 4 in the direction A of cylinder alignment. The EGR housing portion 25 is located on the opposite side of the cylinder head cover 5 from the chain cover 10. In other words, the EGR housing portion 25 is adjacent to the cylinder head cover 5 in the direction A of cylinder alignment.

[0049] The cylinder head cover 5 is made of resin, and the EGR housing portion 25 is made of metal such as aluminum die-cast.

[0050] The EGR housing 25 constitutes a first cylinder head cover, and the cylinder head cover 5 constitutes a second cylinder head cover. The EGR housing 25 and the cylinder head cover 5 constitute a cylinder head cover.

[0051] As shown in FIGS. 5 and 6, the EGR housing portion 25 has a front wall 25A, a rear wall 25B, a left side wall 25C, and an upper wall 25D.

[0052] As shown in FIG. 3, the front wall 25A is located on the exhaust side wall 4B side of the cylinder head 4, and the rear wall 25B is located on the intake side wall 4A side of the cylinder head 4.

[0053] As shown in Figures 5 and 6, the left side wall 25C connects the left end portion (end portion in the cylinder alignment direction A) of the front wall 25A to the left end portion (end portion in the cylinder alignment direction A) of the rear wall 25B, and the upper wall 25D connects the upper end portion of the front wall 25A, the upper end portion of the rear wall 25B, and the upper end portion of the left side wall 25C.

[0054] In this embodiment, the front wall 25A constitutes a first side wall, the rear wall 25B constitutes a second side wall, and the left side wall 25C constitutes a third side wall.

[0055] The EGR housing 25 is provided with an EGR passage 26. The EGR passage 26 is formed in a cylindrical shape, and an EGR passage 26a through which EGR gas flows is formed inside (see FIG. 7). In this embodiment, the upstream EGR pipe 12, the downstream EGR pipe 15, and the EGR passage 26 constitute the EGR passage.

[0056] The EGR passage 26 has an EGR gas inlet 26b and an EGR gas outlet 26c. The EGR gas inlet 26b is provided in the front wall 25A (see FIG. 2), and the EGR gas outlet 26c is provided in the rear wall 25B.

[0057] The EGR gas inlet 26b is an open end on the front side (upstream side) of the EGR passage 26a, and the EGR gas outlet 26c is an open end on the rear side (downstream side) of the EGR passage 26a.

[0058] The EGR passage 26 in this embodiment extends linearly in a direction (front-rear direction) horizontally perpendicular to the cylinder row direction A, and is provided outside (on the left side) of the intake side wall 4A in the cylinder row direction A. In other words, the EGR passage 26 is provided in a direction away from the cylinder head cover 5 with respect to the intake side wall 4A in the cylinder row direction A.

[0059] The EGR passage portion 26 is not limited to extending linearly in a direction perpendicular to the horizontal direction of the cylinder rows A, but may extend at an angle relative to the direction of the cylinder rows A. Note that "horizontal" also includes a direction close to horizontal, i.e., a direction slightly inclined relative to the horizontal.

[0060] As shown in FIG. 2, a flange portion 25a is provided on the front wall 25A, and an EGR gas inlet port 26b is formed inside the flange portion 25a.

[0061] 1, the flange portion 25a is attached to the flange portion 14a of the EGR valve 14. An EGR gas outlet (not shown) is provided inside the flange portion 14a, and the EGR gas discharged from the EGR valve 14 is introduced into the EGR passage 26a through the EGR gas inlet port 26b.

[0062] As shown in FIGS. 5 and 6, a flange portion 25b is provided on the rear wall 25B, and an EGR gas discharge port 26c is formed inside the flange portion 25b.

[0063] 1, the flange portion 25b is attached to the flange portion 15a of the downstream EGR pipe 15. An EGR gas inlet port (not shown) is provided inside the flange portion 15a, and the EGR gas flowing through the EGR passage 26a is discharged to the downstream EGR pipe 15 through the EGR gas inlet port of the flange portion 15a.

[0064] That is, in the engine 1 of this embodiment, an EGR housing portion 25 is attached to the left end of the cylinder head 4 above the cylinder head 4, and EGR gas is introduced from the exhaust side to the intake side through an EGR passage portion 26 provided in the EGR housing portion 25.

[0065] 4, bosses 27A and 27B are provided at the front and rear ends of left side wall 25C, and bosses 27A and 27B extend in the vertical direction along left side wall 25C. Bosses 27F and 27G are provided at front wall 25A and rear wall 25B, and bosses 27F and 27G extend in the vertical direction along front wall 25A and rear wall 25B.

[0066] Bolt grooves (not shown) are provided at the upper left end of the cylinder head 4. Bolts 41A are inserted into the bosses 27A, 27B, 27F, and 27G, and the bolts 41A are threaded into the bolt grooves in the cylinder head 4. In this way, the EGR housing 25 is fixed to the cylinder head 4.

[0067] As shown in Fig. 4, a flange portion 4F is provided at the upper end of the cylinder head 4. The flange portion 4F is provided around the periphery of the cylinder head 4, and the cylinder head 4 is open on the inside of the flange portion 4F. In other words, an opening 4h is formed in the upper part of the cylinder head 4.

[0068] A flange portion 10F is provided at the upper end of the chain cover 10, and the flange portion 10F is connected to the flange portion 4F.

[0069] The EGR housing portion 25 is provided with a housing-side flange portion 25c, a front flange portion 25d, and a rear flange portion 25e.

[0070] 4, the housing flange portion 25c extends from the front wall 25A to the rear wall 25B so as to be adjacent to the upper wall 25D. That is, the housing flange portion 25c is connected to the right end portion (the end portion on the chain cover 10 side) of the upper wall 25D.

[0071] The housing flange 25c is provided with a curved portion 25p, which curves from the center in the direction in which the housing flange 25c extends (the center in the front-rear direction) toward the left side wall 25C.

[0072] In this embodiment, the curved portion 25p makes the width of the upper wall 25D in the cylinder row direction A at the center of the fore-and-aft direction of the upper wall 25D shorter than the width of the upper wall 25D in the cylinder row direction A at the front side and the width of the upper wall 25D in the cylinder row direction A at the rear side.

[0073] As a result, the area of ​​the flat portion at the center of the upper wall 25D in the front-rear direction is smaller than the areas of the front and rear sides of the upper wall 25D.

[0074] The front flange portion 25d is located at the upper end of the front wall 25A and extends from the front end of the housing flange portion 25c to the flange portion 4F, and is in contact with the flange portion 4F.

[0075] The rear flange portion 25e is located at the upper end of the rear wall 25B and extends from the rear end of the housing flange portion 25c to the flange portion 4F, and is in contact with the flange portion 4F.

[0076] 2 and 3, a flange portion 5F is provided on the lower edge of the outer periphery of the cylinder head cover 5, and the flange portion 5F extends along the flange portions 4F, 10F, 25c, 25d, and 25e. In other words, the flange portion 5F faces the flange portions 4F, 10F, 25c, 25d, and 25e in the up-down direction.

[0077] As shown in FIG. 4, a plurality of bosses 4D are formed on the flange 4F, and the bosses 4D are spaced apart in the direction in which the flange 4F extends.

[0078] A plurality of bosses 10A are formed on the flange 10F, and the bosses 10A are spaced apart in the direction in which the flange 10F extends (see FIG. 2).

[0079] Bosses 27C, 27D, and 27E are provided on the upper wall 25D of the EGR housing portion 25. The bosses 27C, 27D, and 27E protrude upward from the upper wall 25D and are connected to the housing-side flange portion 25c.

[0080] As a result, the boss portions 27C, 27D, and 27E are connected to one another by the housing-side flange portion 25c. The housing-side flange portion 25c of this embodiment forms a flange portion.

[0081] As shown in FIG. 2, a plurality of bosses 5A are provided on the flange 5F of the cylinder head cover 5, and the bosses 5A are provided spaced apart in the direction in which the flange 5F extends.

[0082] The bosses 5A and 4D, the boss 10A and the bosses 27C, 27D, and 27E are aligned in the vertical direction. Bolts 41B and 41C are inserted through the bosses 5A and 4D, the boss 10A and the bosses 27C, 27D, and 27E, and the cylinder head cover 5 is fixed to the cylinder head 4 by the bolts 41B and 41C.

[0083] That is, the cylinder head cover 5 is fixed across the cylinder head 4, the chain cover 10 and the EGR housing portion 25, and covers the opening 4h of the cylinder head 4.

[0084] As shown in FIG. 6, mounting bosses 28A and 28B are provided on upper wall 25D, and as shown in FIG. 5, an exhaust cam angle sensor 31 and an intake cam angle sensor 32 are attached to mounting bosses 28A and 28B, respectively.

[0085] The exhaust cam angle sensor 31 has a sensor body 31A fixed to the mounting boss portion 28A by a bolt 41D, and a connector 31B attached to the upper end of the sensor body 31A.

[0086] Intake cam angle sensor 32 has a sensor main body 32A fixed to mounting boss portion 28B with bolt 41D, and a connector 32B attached to the upper end of sensor main body 32A. Exhaust cam angle sensor 31 and intake cam angle sensor 32 have the same configuration and are compatible with each other.

[0087] As shown in FIG. 7, sensor body 31A of exhaust cam angle sensor 31 is attached to mounting boss portion 28A via seal member 29, which prevents water or foreign matter from entering the inside of EGR housing portion 25 between sensor body 31A and mounting boss portion 28A.

[0088] A sealing member (not shown) is also interposed between sensor body 32A and mounting boss portion 28B of intake cam angle sensor 32. Exhaust cam angle sensor 31 and intake cam angle sensor 32 of this embodiment constitute a cam angle sensor.

[0089] As shown in Figure 4, an intake side sensing rotor 16S and an exhaust side sensing rotor 17S are attached to the left ends of the intake camshaft 16 and the exhaust camshaft 17, and the intake side sensing rotor 16S and the exhaust side sensing rotor 17S are located below the upper wall 25D of the EGR housing portion 25.

[0090] Protrusions (not shown) are formed on the outer peripheries of the intake-side sensing rotor 16S and the exhaust-side sensing rotor 17S, and the protrusions are formed in a pattern specific to each cylinder 3A.

[0091] The exhaust cam angle sensor 31 and the intake cam angle sensor 32 face the intake side sensing rotor 16S and the exhaust side sensing rotor 17S in the vertical direction, and the sensor body 31A detects the protrusions of the intake side sensing rotor 16S and the exhaust side sensing rotor 17S to detect the rotational angle (rotational phase) of the intake camshaft 16 and the exhaust camshaft 17.

[0092] The connectors 31B and 32B are connected to a controller via a wire harness (not shown), and information regarding the cam angle detected by the sensor main bodies 31A and 32A is transmitted from the connectors 31B and 32B to the controller (not shown) via the wire harness.

[0093] As shown in FIGS. 6 and 7, the mounting boss portions 28A and 28B are connected to the EGR passage portion 26.

[0094] As shown in FIG. 7, the lower end portions 28a of the mounting boss portions 28A, 28B are located above the lower end portion 26d of the EGR passage portion 26 and below the upper end portion 26e of the EGR passage portion 26, and the upper end portions 28b of the mounting boss portions 28A, 28B are located above the upper end portion 26e of the EGR passage portion 26.

[0095] That is, the upper end 26e of the EGR passage portion 26 is located higher than the lower end portions 28a of the mounting boss portions 28A, 28B.

[0096] Although the mounting boss portion 28B is not shown in Fig. 7, the positional relationship between the mounting boss portion 28B and the EGR passage portion 26 is the same as the positional relationship between the mounting boss portion 28A and the EGR passage portion 26. The mounting boss portion 28B is located on the far side (rear side) of the mounting boss portion 28A in Fig. 7. Therefore, in Fig. 7, the mounting boss portion 28B located on the far side of the mounting boss portion 28A is indicated by an imaginary line.

[0097] As shown in FIG. 4, the boss portion 27C is disposed on the EGR passage portion 26 side with respect to the boss portions 27D and 27E, and is connected to the EGR passage portion 26.

[0098] The boss portion 27D is provided on the upper wall 25D on the front wall 25A side of the boss portion 27C, and is located closer to the front wall 25A than the mounting boss portion 28A.

[0099] Boss portion 27E is provided on upper wall 25D on the rear wall 25B side of boss portion 27C, and is located closer to the rear wall 25B than mounting boss portion 28B.

[0100] In this embodiment, boss 27C constitutes the fastening portion and the first fastening portion, boss 27D constitutes the fastening portion and the second fastening portion, boss 27E constitutes the fastening portion and the third fastening portion, and bolt 41C constitutes the fastener.

[0101] Mounting boss portion 28A is disposed between boss portion 27C and boss portion 27D. Specifically, mounting boss portion 28A is disposed between boss portion 27C and boss portion 27D so as to pass through imaginary line 42A connecting boss portion 27C and boss portion 27D. In other words, mounting boss portion 28A is sandwiched between boss portion 27C and boss portion 27D.

[0102] Mounting boss portion 28B is disposed between boss portion 27C and boss portion 27E. Specifically, mounting boss portion 28B is disposed between boss portion 27C and boss portion 27E so as to pass through imaginary line 42B connecting boss portion 27C and boss portion 27E. In other words, mounting boss portion 28B is sandwiched between boss portion 27C and boss portion 27E.

[0103] Mounting boss portion 28A overlaps boss portion 27D in cylinder alignment direction A, and mounting boss portion 28B overlaps boss portion 27E in cylinder alignment direction A. In other words, mounting boss portions 28A, 28B, boss portion 27D, and boss portion 27E overlap in cylinder alignment direction A.

[0104] In other words, the mounting bosses 28A, 28B, the boss 27D, and the boss 27E are arranged side by side in a direction (front-rear direction) that is horizontally perpendicular to the cylinder row direction A.

[0105] Next, the effects of the mounting structure of the cam angle sensor for the engine 1 according to this embodiment will be described. In the mounting structure for the cam angle sensor of the engine 1 of this embodiment, an EGR housing portion 25 is mounted to the cylinder head 4. The EGR housing portion 25 has a front wall 25A located on the exhaust side wall 4B side of the cylinder head 4, a rear wall 25B located on the intake side wall 4A side of the cylinder head 4, and a left side wall 25C connecting the left end of the front wall 25A in the cylinder alignment direction A to the left end of the rear wall 25B in the cylinder alignment direction A.

[0106] The EGR housing portion 25 also has mounting boss portions 28A and 28B to which an exhaust cam angle sensor 31 and an intake cam angle sensor 32 are attached, an upper wall 25D connected to the upper end of the front wall 25A, the upper end of the rear wall 25B, and the upper end of the left side wall 25C, and a cylindrical EGR passage portion 26 provided on the left side wall 25C side and having an EGR passage 26a through which EGR gas flows.

[0107] The EGR passage portion 26 is provided in the front wall 25A with an EGR gas inlet 26b that introduces EGR gas into the EGR passage 26a, and is provided in the rear wall 25B with an EGR gas outlet 26c that discharges EGR gas from the EGR passage 26a, and mounting boss portions 28A and 28B are connected to the EGR passage portion 26.

[0108] In this way, by connecting the mounting bosses 28A, 28B to the highly rigid cylindrical EGR passage portion 26, the mounting bosses 28A, 28B can be reinforced by the EGR passage portion 26, and the rigidity of the mounting bosses 28A, 28B can be increased.

[0109] This increases the support rigidity of exhaust cam angle sensor 31 and intake cam angle sensor 32 attached to mounting boss portions 28A, 28B, and prevents exhaust cam angle sensor 31 and intake cam angle sensor 32 from vibrating due to vibration of engine 1. As a result, it is possible to prevent a decrease in the accuracy with which exhaust cam angle sensor 31 and intake cam angle sensor 32 detect the rotation angles of intake camshaft 16 and exhaust camshaft 17.

[0110] Furthermore, according to the mounting structure of the cam angle sensor for the engine 1 of this embodiment, the upper end 26e of the EGR passage portion 26 is located higher than the lower end portions 28a of the mounting boss portions 28A, 28B.

[0111] This allows the upper end 26e of the EGR passage portion 26, which is formed in an arc shape, to bulge out from the upper wall 25D of the EGR housing portion 25. Therefore, the upper end 26e of the EGR passage portion 26 can reduce the flat portion of the upper wall 25D.

[0112] This increases the surface rigidity of upper wall 25D, thereby suppressing vibration of upper wall 25D due to vibration of engine 1. This further increases the support rigidity of exhaust cam angle sensor 31 and intake cam angle sensor 32, thereby more effectively suppressing vibration of exhaust cam angle sensor 31 and intake cam angle sensor 32.

[0113] As a result, it is possible to more effectively prevent a decrease in the accuracy of detecting the rotation angles of the intake camshaft 16 and the exhaust camshaft 17 by the exhaust cam angle sensor 31 and the intake cam angle sensor 32.

[0114] Furthermore, according to the mounting structure of the cam angle sensor for the engine 1 of this embodiment, the EGR housing portion 25 has a housing-side flange portion 25c that contacts the flange portion 4F of the cylinder head 4, and the housing-side flange portion 25c extends from the front wall 25A to the rear wall 25B so as to be adjacent to the upper wall 25D.

[0115] In addition, the housing flange portion 25c has a curved portion 25p that curves toward the left side wall 25C.

[0116] This reduces the width between the curved portion 25p and the EGR passage portion 26 in the cylinder row direction A, thereby reducing the flat portion of the upper wall 25D.

[0117] Therefore, the surface rigidity of the upper wall 25D can be further increased, and vibration of the upper wall 25D due to vibration of the engine 1 can be more effectively suppressed.

[0118] Therefore, the support rigidity of exhaust cam angle sensor 31 and intake cam angle sensor 32 can be further increased, and vibration of exhaust cam angle sensor 31 and intake cam angle sensor 32 can be more effectively suppressed.

[0119] As a result, it is possible to more effectively prevent a decrease in the accuracy of detecting the rotation angles of the intake camshaft 16 and the exhaust camshaft 17 by the exhaust cam angle sensor 31 and the intake cam angle sensor 32.

[0120] Furthermore, according to the mounting structure of the cam angle sensor for the engine 1 of this embodiment, the EGR housing portion 25 has boss portions 27C, 27D, and 27E that are fastened to the cylinder head cover 5 by bolts 41C, and the boss portions 27C, 27D, and 27E are provided on the upper wall 25D.

[0121] In addition, mounting boss portion 28A is provided between boss portion 27C and boss portion 27D, and mounting boss portion 28B is provided between boss portion 27C and boss portion 27E.

[0122] In this embodiment, boss portions 27C, 27D, and 27E have high rigidity because they are attached to cylinder head cover 5 by bolts 41C. This increases the rigidity of upper wall 25D around boss portions 27C, 27D, and 27E, making upper wall 25D around boss portions 27C, 27D, and 27E less susceptible to vibration.

[0123] Therefore, by providing mounting boss portion 28A between boss portion 27C and boss portion 27D, which have high rigidity, and providing mounting boss portion 28B between boss portion 27C and boss portion 27E, the rigidity of mounting boss portions 28A and 28B can be further increased.

[0124] This further increases the support rigidity of exhaust cam angle sensor 31 and intake cam angle sensor 32, and more effectively suppresses vibration of exhaust cam angle sensor 31 and intake cam angle sensor 32.

[0125] As a result, it is possible to more effectively prevent a decrease in the accuracy of detecting the rotation angles of the intake camshaft 16 and the exhaust camshaft 17 by the exhaust cam angle sensor 31 and the intake cam angle sensor 32.

[0126] Furthermore, according to the mounting structure of the cam angle sensor of the engine 1 of this embodiment, the mounting boss portion 28A overlaps with the boss portion 27D in the cylinder row direction A, and the mounting boss portion 28B overlaps with the boss portion 27E in the cylinder row direction A.

[0127] This allows highly rigid bosses 27D, 27D to be placed closer to mounting bosses 28A, 28B, and bosses 27D, 27D can further increase the rigidity of upper wall 25D around mounting bosses 28A, 28B.

[0128] Therefore, the rigidity of mounting boss portions 28A and 28B can be further increased, and the supporting rigidity of exhaust cam angle sensor 31 and intake cam angle sensor 32 can be further increased.

[0129] Therefore, vibration of exhaust cam angle sensor 31 and intake cam angle sensor 32 can be more effectively suppressed, and a decrease in the detection accuracy of exhaust cam angle sensor 31 and intake cam angle sensor 32 for detecting the rotation angles of intake camshaft 16 and exhaust camshaft 17 can be more effectively prevented.

[0130] Furthermore, according to the mounting structure of the cam angle sensor for the engine 1 of this embodiment, the boss portion 27C is connected to the EGR passage portion .

[0131] In addition, boss portion 27D is provided on upper wall 25D on the front wall 25A side relative to boss portion 27C, and boss portion 27E is provided on upper wall 25D on the rear wall 25B side relative to boss portion 27C.

[0132] In this way, by connecting the highly rigid boss portion 27C to the highly rigid EGR passage portion 26, the surface rigidity of the upper wall 25D can be further increased.

[0133] Furthermore, the connecting portion between top wall 25D and front wall 25A and the connecting portion between top wall 25D and rear wall 25B are bent, and therefore have high rigidity. Therefore, by providing boss portion 27D on top wall 25D on the highly rigid front wall 25A side and boss portion 27E on top wall 25D on the highly rigid rear wall 25B side, the surface rigidity of top wall 25D can be further increased.

[0134] This more effectively prevents upper wall 25D from vibrating due to vibration of engine 1. This further increases the support rigidity of exhaust cam angle sensor 31 and intake cam angle sensor 32, and more effectively prevents exhaust cam angle sensor 31 and intake cam angle sensor 32 from vibrating.

[0135] As a result, it is possible to more effectively prevent a decrease in the accuracy of detecting the rotation angles of the intake camshaft 16 and the exhaust camshaft 17 by the exhaust cam angle sensor 31 and the intake cam angle sensor 32.

[0136] Furthermore, according to the mounting structure of the cam angle sensor for engine 1 of this embodiment, boss portions 27C, 27D, and 27E are connected to housing side flange portion 25c, and therefore housing side flange portion 25c can be reinforced by boss portions 27C, 27D, and 27E, which have high rigidity, and the rigidity of housing side flange portion 25c can be increased.

[0137] This further increases the rigidity of boss portions 27C, 27D, 27E and upper wall 25D around housing-side flange portion 25c, thereby more effectively suppressing vibration of upper wall 25D.

[0138] Therefore, the rigidity of mounting boss portions 28A and 28B can be further increased, and the supporting rigidity of exhaust cam angle sensor 31 and intake cam angle sensor 32 can be further increased.

[0139] As a result, vibration of exhaust cam angle sensor 31 and intake cam angle sensor 32 can be more effectively suppressed, and a decrease in the detection accuracy of exhaust cam angle sensor 31 and intake cam angle sensor 32 for the rotation angles of intake camshaft 16 and exhaust camshaft 17 can be more effectively prevented.

[0140] While an embodiment of the present invention has been disclosed, it will be apparent to one skilled in the art that modifications may be made thereto without departing from the scope of the present invention, and it is intended that all such modifications and equivalents be included in the following claims. [Explanation of symbols]

[0141] 1...engine (internal combustion engine), 4...cylinder head, 4A...intake side wall, 4a...intake port (air intake port), 4B...exhaust side wall, 4b...exhaust collection section (exhaust gas exhaust port), 5...cylinder head cover, 16...intake camshaft (camshaft), 17...exhaust camshaft (camshaft), 25...EGR housing section, 25A...front wall (first side wall), 25B...rear wall (second side wall), 25C...left side wall (third side wall), 25c...housing side flange section (flange section), 25D...upper wall, 25p...curved section, 2 6...EGR passage portion, 26a...EGR passage, 26b...EGR gas inlet, 26c...EGR gas outlet, 26e...upper end portion (upper end portion of EGR passage portion), 27C...boss portion (fastening portion, first fastening portion), 27D...boss portion (fastening portion, second fastening portion), 27E...boss portion (fastening portion, third fastening portion), 28A, 28B...mounting boss portion, 28a...lower end portion of mounting boss portion, 31...exhaust cam angle sensor (cam angle sensor), 32...intake cam angle sensor (cam angle sensor), 41C...bolt (fastener), A...cylinder alignment direction

Claims

1. a cylinder head having an intake side wall having an air intake port for drawing in intake air and an exhaust side wall having an exhaust gas exhaust port formed therein through which exhaust gas is discharged; a camshaft extending along the cylinder row direction and rotatably supported by the cylinder head; a cylinder head cover and an EGR housing portion attached to the cylinder head so as to cover an upper portion of the cylinder head; a cam angle sensor for detecting a rotation angle of the camshaft, the EGR housing portion includes a first sidewall located on the exhaust sidewall side of the cylinder head, a second sidewall located on the intake sidewall side of the cylinder head, a third sidewall connecting an end of the first sidewall in the cylinder row direction to an end of the second sidewall in the cylinder row direction, an upper wall having a cylindrical mounting boss portion on which the cam angle sensor is mounted and connected to an upper end of the first sidewall, an upper end of the second sidewall, and an upper end of the third sidewall, and a cylindrical EGR passage portion provided on the third sidewall side and having an EGR passage through which EGR gas flows, the EGR passage portion has an EGR gas inlet port provided in the first side wall for introducing EGR gas into the EGR passage, and an EGR gas outlet port provided in the second side wall for discharging EGR gas from the EGR passage, 11. A mounting structure for a cam angle sensor of an internal combustion engine, wherein the mounting boss portion is connected to the EGR passage portion.

2. 2. The mounting structure for a cam angle sensor of an internal combustion engine according to claim 1, wherein an upper end of the EGR passage portion is located higher than a lower end of the mounting boss portion.

3. the EGR housing portion has a plurality of fastening portions that are fastened to the cylinder head cover by fasteners, the plurality of fastening portions are provided on the upper wall, 3. The mounting structure for a cam angle sensor of an internal combustion engine according to claim 1, wherein the mounting boss portion is provided between at least two fastening portions.

4. At least one of the plurality of fastening portions has a first fastening portion connected to the EGR passage portion, 4. The mounting structure for a cam angle sensor of an internal combustion engine according to claim 3, wherein the plurality of fastening portions include a second fastening portion provided on the upper wall on the first side wall side relative to the first fastening portion, and a third fastening portion provided on the upper wall on the second side wall side relative to the first fastening portion.

5. the EGR housing portion has a flange portion that contacts the cylinder head cover, the flange portion extending from the first side wall to the second side wall so as to be adjacent to the top wall, 5. The mounting structure for a cam angle sensor of an internal combustion engine according to claim 3, wherein the flange portion has a curved portion that curves toward the third side wall.

6. 6. The mounting structure for a cam angle sensor of an internal combustion engine according to claim 5, wherein the plurality of fastening portions are connected to the flange portion.

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