JP6350339B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine, and more particularly to an internal combustion engine having a cylinder head having an accessory mounting bracket for mounting the accessory to the cylinder head, and a seal member interposed between the cylinder head and the cylinder head cover.

  A cylinder head of an internal combustion engine mounted on a vehicle such as an automobile is provided with an auxiliary machine such as a vacuum pump, and this auxiliary machine is attached to the cylinder head by an auxiliary machine mounting bracket. Since this accessory mounting bracket is driven by the end portion of the cam shaft, the accessory mounting bracket constitutes a bearing support portion for rotatably supporting the cam shaft together with the cylinder head.

  The cylinder head is provided with a cylinder head cover, and the cylinder head cover is attached to the cylinder head via a seal member. Conventionally, for example, a cylinder head described in Patent Document 1 is known as a cylinder head cover attached to a cylinder head via a seal member.

  The cylinder head includes an accessory mounting bracket having an upper surface of the cylinder head and a side wall portion extending upward from the upper surface of the cylinder head. An arch-shaped seal member is provided between the cylinder head, the cylinder head cover and the accessory mounting bracket, and the cylinder head is attached between the cylinder head and the accessory mounting bracket via the seal member. Yes.

JP 2008-223609 A

  In the conventional internal combustion engine, since the accessory mounting bracket has a side wall portion extending upward from the upper surface of the cylinder head, the joint surface with respect to the side wall portion of the cylinder head cover extends from the upper surface of the cylinder head to the side wall of the auxiliary device mounting bracket. It will change in the height direction toward the part.

Therefore, when assembling the cylinder head cover to the cylinder head, when pressed against the cylinder head cover through a seal member on the side wall portion of the accessory mounting bracket, depending on the pressing direction of the cylinder head cover, is evenly amount of deflection of the sealing member It is possible that it will not be. Therefore, it is conceivable that the sealing performance between the cylinder head and the cylinder head cover is lowered.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide an internal combustion engine that can prevent the sealing performance of a cylinder head and a cylinder head cover from being lowered.

The present invention extends in the direction orthogonal to the first wall portion having a first deck surface that is flat on the upper surface and extending in the axial direction of the cam shaft, and in the direction perpendicular to the axial end portion of the cam shaft of the first wall portion. A cylinder head having a second wall portion having a flat second deck surface, a first side wall portion extending along the first deck surface and attached to the first deck surface, a first side wall A second side wall, a first side wall, and a second side wall that are continuous with the first side wall so as to extend in a direction orthogonal to the axial end of the cam shaft of the unit and are attached to the second deck surface An auxiliary machine mounting bracket that mounts the auxiliary machine to the cylinder head, and is joined to the cylinder head and the auxiliary machine mounting bracket via a seal member, and is connected to the cylinder head by a fastener. And a cylinder head cover to be fastened The auxiliary engine mounting bracket is a combustion engine, and faces the axial direction end of the cam shaft of the first side wall portion toward the axial direction of the cam shaft and upwards from the first deck surface toward the connecting wall portion. A first inclined surface extending to the end of the second side wall portion in a direction orthogonal to the axis of the cam shaft, and directed to a direction orthogonal to the cam shaft, and from the second deck surface to the connecting wall portion. A second inclined surface extending upward, and the outer edge of the first inclined surface, the second inclined surface, and the connecting wall portion continuous with the first inclined surface and the second inclined surface is a seal member Constitutes a sealing surface to be sealed.

  As described above, according to the present invention, when the cylinder head cover is attached to the cylinder head via the seal member, the cylinder head cover is brought into contact with the first inclined surface and the second inclined surface via the seal member. Thus, positioning can be performed in the axial direction of the cam shaft and in the direction orthogonal to the cam shaft.

  Further, when the cylinder head cover is attached to the cylinder head via the seal member, the cylinder head cover is displaced in the axial direction of the cam shaft with respect to the cylinder head, and between the first inclined surface of the accessory mounting bracket and the cylinder head cover. When the sandwiched seal member is compressed, the seal member sandwiched between the cylinder head cover and the second inclined surface of the accessory mounting bracket orthogonal to the direction of displacement (in this case, the axial direction of the camshaft). An appropriate compression amount is maintained without reducing the compression amount.

Also, when the cylinder head cover is displaced in the direction perpendicular to the axis of the cam shaft with respect to the cylinder head, the seal member sandwiched between the second inclined surface of the accessory mounting bracket and the cylinder head cover is compressed. The amount of compression of the seal member sandwiched between the first inclined surface of the accessory mounting bracket perpendicular to the direction (in this case, the direction perpendicular to the axial direction of the camshaft) and the cylinder head cover remains unchanged. Maintain compression.

  As a result, the compression amount of the seal member interposed between the first inclined surface and the second inclined surface and the cylinder head cover is made appropriate to prevent the sealing performance between the cylinder head and the cylinder head cover from being deteriorated. it can.

FIG. 1 is a diagram showing an embodiment of an internal combustion engine according to an embodiment of the present invention, and is a top view of the internal combustion engine. FIG. 2 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a top view of the cylinder head with the cylinder head cover removed. FIG. 3 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a perspective view of the cylinder head with the cylinder head cover removed. FIG. 4 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a front view of the cylinder head with the cylinder head cover removed. FIG. 5 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a top view of the cylinder head in a state where the cylinder head cover and the fuel pump mounting bracket are removed. FIG. 6 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a side view of the internal combustion engine. 7 is a diagram showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a cross-sectional view taken along the line VII-VII in FIG. FIG. 8 is a diagram showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a perspective view of the main part of the cylinder head with the cylinder head cover removed. FIG. 9 is a diagram showing an embodiment of an internal combustion engine according to an embodiment of the present invention, in which the load is input from the fuel pump to the intake camshaft and the load is input from the intake valve to the intake camshaft. FIG. FIG. 10 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a side view of the cylinder head with the cylinder head cover removed. FIG. 11 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a side view of the cylinder head with the cylinder head cover and the fuel pump mounting bracket removed. FIG. 12 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a perspective view of the fuel pump mounting bracket as viewed from the left side of the vehicle. FIG. 13 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a perspective view of the fuel pump mounting bracket as viewed from the front side of the vehicle. FIG. 14 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a perspective view of a seal member. FIG. 15 is a view showing an embodiment of the internal combustion engine according to the embodiment of the present invention, and is a top view of the cylinder head with a seal member attached thereto.

Embodiments of an internal combustion engine according to the present invention will be described below with reference to the drawings.
1 to 15 are views showing an internal combustion engine according to an embodiment of the present invention.
First, the configuration will be described.
In FIG. 1, an engine 1 constituting an internal combustion engine of the present invention is a horizontal 4 that performs a series of four strokes including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke while a piston (not shown) reciprocates two cylinders. It consists of a cycle engine.

  The engine 1 is mounted on a vehicle, and the engine 1 includes a cylinder head 11 and a cylinder head cover 12. 1 to 15, front and rear, left and right, and upper and lower directions represent directions viewed from the driver's seat of the vehicle on which the engine 1 is mounted.

  The cylinder head 11 is attached to the upper part of a cylinder block (not shown). The cylinder block has a cylinder (not shown) that accommodates a piston (not shown) so as to be movable up and down, and the vertical movement of the piston is converted into a rotational movement of a crankshaft (not shown) provided in the cylinder block.

  1 and 2, the cylinder head 11 extends parallel to the direction of the intake camshaft 13, which is the vehicle width direction, and has a rear wall having deck surfaces 31C and 32C (see FIGS. 2, 3, and 5) at the upper end. Left side wall having a flat deck surface 33C extending from the left end portion of the portion 31 and the front side wall portion 32 and from the left end portion of the rear side wall portion 31 and the front side wall portion 32 in a direction orthogonal to the intake camshaft 13 which is the vehicle front-rear direction Portion 33, right side wall portion 34 extending from the right end portion of rear side wall portion 31 and front side wall portion 32 in a direction orthogonal to intake camshaft 13, rear side wall portion 31, front side wall portion 32, left side wall portion 33 and right side wall The bottom wall part 35 (refer FIG. 3) following the part 34 is provided, and it is comprised by the rectangular parallelepiped case.

  In addition, the rear side wall part 31 of this Embodiment comprises the 1st wall part of this invention, and the left side wall part 33 comprises the 2nd wall part of this invention. The deck surface 31C constitutes the first deck surface of the present invention, and the deck surface 33C constitutes the second deck surface of the present invention.

In FIG. 2, a boss portion 16 that accommodates a spark plug 15 is formed at the center of the cylinder head 11, and the spark plug 15 includes a bottom surface of a bottom wall portion 35 of the cylinder head 11 and an upper portion of a cylinder of a cylinder block. It protrudes into a combustion chamber (not shown) formed by. The engine 1 according to the embodiment is a four-cylinder direct injection gasoline engine having four spark plugs 15.
In FIG. 1, the cylinder head 11 is provided with a plurality of ignition coils 2 to be paired with the ignition plug 15, and the ignition coil 2 ignites the ignition plug 15.

  2 and 3, the cylinder head 11 is provided with an intake camshaft 13 and an exhaust camshaft 14 extending in parallel with the intake camshaft 13. 2 and 8, the intake camshaft 13 and the exhaust camshaft 14 are rotatably supported by a lower cam housing 18 and an upper cam housing 17 that serve as bearings installed at the upper part of the cylinder head 11.

  A cam sprocket (not shown) is provided at the right ends of the intake camshaft 13 and the exhaust camshaft 14, and a timing chain (not shown) is wound around the cam sprocket. The timing chain is wound around a cranks plot (not shown) of the crankshaft, and the timing chain transmits the rotation of the crankshaft to the intake camshaft 13 and the exhaust camshaft 14.

  The intake cam shaft 13 is provided with a plurality of intake cams 13 </ b> A. As shown in FIG. 9, the intake cam 13 </ b> A is in contact with the rocker arm 19. The rocker arm 19 is in contact with the pivot 20 </ b> A of the hydraulic lash adjuster 20.

  At the center of the rocker arm 19, a pressed roller 19A is supported by a pin 19B. The pressed roller 19A protrudes from the upper surface of the rocker arm 19, and the pressed roller 19A contacts the intake cam 13A.

  The lower surface of the arm tip 19D on the other end side of the rocker arm 19 is in contact with the upper end of the intake valve 21. The intake valve 21 is provided so as to be able to advance and retract in the axial direction with respect to the cylinder head 11. The intake valve 21 is pulled up by the valve spring 22, that is, an intake port 46 opened and closed by the intake valve 21 (see FIG. 1). ) And the combustion chamber.

  When the rocker arm 19 pushes down the intake valve 21 against the urging force of the valve spring 22 by the rotation of the intake cam 13A, the intake port 46 and the combustion chamber communicate with each other. Thus, the intake valve 21 is moved forward and backward by the rotation of the intake cam 13A, whereby the intake port 46 and the combustion chamber are communicated and blocked. Here, the rocker arm 19 and the valve spring 22 of the present embodiment constitute the valve lifter of the present invention.

  The exhaust camshaft 14 is provided with a plurality of exhaust cams 14A, and the exhaust cams 14A are in contact with the upper end of an exhaust valve (not shown) via a rocker arm (not shown). The exhaust cam 14A is also in contact with the exhaust valve via a rocker arm (not shown) having the same configuration as that of the rocker arm 19, and is driven by the same structure as that of the intake side so that the exhaust port communicates with the combustion chamber. Cut off.

1 to 4 and 6 to 10, a fuel pump 41 and a fuel pump mounting bracket 42 are attached to the cylinder head 11. The fuel pump 41 is provided with a fuel supply pipe 44, and low pressure fuel is supplied to the fuel pump 41 from the fuel supply pipe 44.
The fuel pump 41 is provided with a fuel supply pipe 43, and the fuel adjusted by the fuel pump 41 is introduced into the fuel supply pipe 43.

  In FIG. 1, a delivery pipe 45 is provided in the cylinder head 11, and the delivery pipe 45 supplies the fuel introduced from the fuel supply pipe 43 to a fuel injection valve (not shown).

  The fuel injection valve is installed for each combustion chamber of the cylinder head 11, and the delivery pipe 45 distributes and supplies the high-pressure fuel introduced from the fuel supply pipe 43 to the fuel injection valve. The fuel injection valve directly injects high-pressure fuel supplied from the delivery pipe 45 into the combustion chamber.

  In FIG. 1, a plurality of intake ports 46 are formed in the rear side wall portion 31, and each intake port 46 communicates with a cylinder. An intake manifold (not shown) is attached to the rear side wall 31, and the intake manifold distributes and introduces intake air purified by an air cleaner (not shown) to each intake port 46.

  3 and 4, an exhaust collecting passage 47 is formed in the front side wall portion 32, and the exhaust collecting passage 47 collects exhaust ports communicating with the respective combustion chambers. The exhaust gas collected in the exhaust collecting passage 47 through the exhaust port from the cylinder is purified by a catalyst device (not shown) communicating with the exhaust collecting passage 47 and then exhausted to an exhaust pipe (not shown). Further, a turbocharger turbine housing (not shown) may be provided between the catalyst device and the exhaust collecting passage 47.

Here, the cylinder head 11 and the fuel pump mounting bracket 42 of the present embodiment are made of a metal material, and the cylinder head cover 12 is made of a resin material.
4, 7, and 8, the intake camshaft 13 is provided with a pump drive cam 13B, and the fuel pump 41 is driven by the pump drive cam 13B.

  In FIG. 7, the fuel pump 41 includes a pump body 51, a plunger 52, an electromagnetic valve 53, a spring 54, and a connector 55 that electrically connects the electromagnetic valve 53 and a controller (not shown).

  The pump body 51 includes a suction port 51a for sucking fuel, a discharge port 51b for discharging fuel, a pressure chamber 51c communicating with the suction port 51a and the discharge port 51b, and an opening / closing valve for opening and closing the suction port 51a with an electromagnetic valve 53. 51d. The pump main body 51 includes a cylinder 51e that movably accommodates the plunger 52, and a flange 51f that attaches the pump main body 51 to the fuel pump mounting bracket 42.

  The intake port 51 a is connected to the fuel supply pipe 44, and the discharge port 51 b is connected to the fuel supply pipe 43. The discharge port 51b is provided with a check valve (not shown). The check valve opens when the fuel pressure in the pressure chamber 51c exceeds a predetermined value, and discharges fuel from the discharge port 51b into the fuel supply pipe 43. To do.

  The plunger 52 has a roller 52a that contacts the pump drive cam 13B and a lifter member 52b that rotatably supports the roller 52a. The lifter member 52b is pressed toward the pump drive cam 13B by a spring 54, and the roller 52a is in contact with the pump drive cam 13B with a predetermined pressing force. Thereby, the plunger 52 reciprocates in the direction orthogonal to the axial direction of the intake camshaft 13 by the rotational movement of the pump drive cam 13B.

  The fuel pump 41 sucks fuel into the pressure chamber 51c where the suction port 51a is opened and the volume is increased when the plunger 52 is lowered by the rotation of the pump drive cam 13B. Further, in the fuel pump 41, when the plunger 52 is raised by the rotation of the pump drive cam 13B, the suction port 51a is closed, and the pressure of the fuel sucked into the pressure chamber 51c is increased.

  The electromagnetic valve 53 has a solenoid controlled by a controller. The solenoid valve 53 opens the on-off valve 51d when sucking fuel from the suction port 51a, and communicates between the pressure chamber 51c and the suction port 51a when increasing the fuel pressure. Shut off.

  In FIG. 9, the intake cam 13 </ b> A and the plunger 52 of the fuel pump 41 are installed so as to sandwich the intake cam shaft 13. As a result, the direction of the load F1 applied from the rocker arm 19 to the intake camshaft 13 by the valve spring 22 is opposite to the direction of the load F2 applied from the plunger 52 to the intake camshaft 13 by the spring 54.

  7 and 8, the left end portion 13a of the intake camshaft 13 extends outside the left side wall portion 33 with respect to the inside of the cylinder head 11 provided with the intake cam 13A, the pump drive cam 13B, and the exhaust cam 14A. ing. Here, the intake camshaft 13 of the present embodiment constitutes the camshaft of the present invention, and the intake cam 13A constitutes the cam lobe of the present invention. Further, the left end portion 13a of the intake camshaft 13 constitutes an end portion of the camshaft of the present invention.

A sensing rotor 61 is provided at the left end 13a of the intake camshaft 13 that extends to the outside from the left side wall 33, and the sensing rotor 61 is formed with a plurality of protrusions 61A having different lengths in the circumferential direction. Yes. A cam angle sensor 62 is provided at a position facing the sensing rotor 61 (see FIGS. 10 and 11), and the cam angle sensor 62 detects the rotation angle of the sensing rotor 61.
Here, the sensing rotor 61 of the present embodiment constitutes a detected rotor of the present invention, and the cam angle sensor 62 constitutes a rotation angle detection sensor.

  In FIG. 7, the left end bearing portion 13 b of the intake camshaft 13 is rotatably supported by the left side wall portion 33 and the fuel pump mounting bracket 42.

  12 and 13, the fuel pump mounting bracket 42 extends along the deck surface 31C and is attached to the deck surface 31C, and the axial direction of the intake camshaft 13 of the first side wall 71. A second side wall 72 connected to the deck surface 33C is connected to the first side wall 71 so as to extend in an orthogonal direction from the end, and the first side wall 71 and the second side wall 72 are connected to each other. And a connecting wall portion 73.

  The second side wall portion 72 has a bearing support portion 72a formed in a semicircular shape so as to support the bearing portion 13b of the intake camshaft 13 from above. The left side wall 33 is formed with a bearing support portion 33A (see FIGS. 5 and 7) formed in a semicircular shape so as to support the bearing portion 13b of the intake camshaft 13 from below. Here, the bearing support portions 33A and 72a of the present embodiment constitute the bearing support portion of the present invention.

  A fuel pump mounting boss 74 is formed in the second side wall 72, and the fuel pump mounting boss 74 has a through hole 74 a into which the pump main body 51 of the fuel pump 41 is inserted. A flange 74b is formed at the opening end of the through hole 74a of the fuel pump mounting boss 74, and the flange 74b is fixed to the flange 51f of the pump body 51 by a bolt 76A (see FIG. 8).

  The flange 74 b is formed so as to be inclined with respect to the upper surfaces of the rear side wall portion 31, the front side wall portion 32 and the left side wall portion 33, that is, the upper surface of the cylinder head 11. Accordingly, in the state where the fuel pump 41 is attached to the fuel pump mounting bracket 42, the axis of the plunger 52 in the fuel pump 41 is inclined with respect to the upper surface of the cylinder head 11. This inclination angle is set in the range of 0 ° to 180 °. Thereby, the vertical height of the engine 1 can be shortened, and the vertical height of the vehicle can be shortened.

  The first side wall portion 71 is provided with fixed boss portions 75A and 75B in which through holes 75a and 75b are formed. Bolts 76B and 76C are inserted into the through holes 75a and 75b. Bolt holes 31A and 31B to which bolts 76B and 76C are fastened are formed in the rear side wall portion 31 (see FIG. 5), and in the first side wall portion 71, the bolts 76B and 76C are inserted into the through holes 75a and 75b. Then, the bolts 76B and 76C are fitted into the bolt holes 31A and 31B, thereby being fixed to the rear side wall portion 31.

  The second side wall portion 72 is provided with a fixed boss portion 75C in which a through hole 75c is formed, and a bolt 76D is inserted into the through hole 75c. A bolt hole 33B to which a bolt 76D is fastened is formed in the left side wall 33 (see FIG. 5), and the bolt hole 33B is separated from the bolt hole 31B with respect to the axial direction of the intake camshaft 13.

Accordingly, the bolt 76C fitted into the bolt hole 31B is separated from the bolt 76D fitted into the bolt hole 33B. Here, the bolts 76B to 76D of the present embodiment constitute a fastening member of the present invention.
The second side wall portion 72 is fixed to the left side wall portion 33 by inserting a bolt 76D into the through hole 75c and fitting the bolt 76C into the bolt hole 33B.

  An inclined surface 71 </ b> A is formed at the end of the first side wall 71 in the axial direction of the intake camshaft 13. The inclined surface 71A is directed in the axial direction of the intake cam shaft 13, and extends upward from the deck surface 31C toward the connecting wall portion 73.

An inclined surface 72A is formed at the end of the second side wall 72 in the direction perpendicular to the axis of the intake camshaft 13. The inclined surface 72A faces in a direction orthogonal to the intake camshaft 13, and extends upward from the deck surface 33C toward the connecting wall portion 73.

  A seal member 4 (see FIG. 14) is interposed between the cylinder head 11 and the cylinder head cover 12. The seal member 4 is inclined along the flat surface 4A extending along the deck surfaces 31C, 32C, and 33C, the inclined portion 4B inclined from the flat portion 4A along the inclined surface 71A, and the inclined surface 72A from the flat portion 4A. An inclined portion 4C and a flat portion 4D that continues to the inclined portions 4B and 4C and extends along the outer edge 73A (see FIGS. 1, 2, and 8) of the connecting wall portion 73 that continues to the inclined surfaces 71A and 72A. ing.

The seal member 4 has a protruding portion 4a protruding from the flat portions 4A and 4D and the inclined portions 4B and 4C.
It has. A concave surface 12B is formed along the bottom surface of the cylinder head cover 12 on the facing surface of the cylinder head cover 12 facing the cylinder head 11, and the protruding portion 4a is inserted into the concave portion 12B.

  In FIG. 2, deck surfaces 31C, 32C, 33C, inclined surfaces 71A, 72A, and an outer edge 73A of the connecting wall portion 73 continuous with the inclined surfaces 71A, 72A constitute a sealing surface 5, and the cylinder head cover 12 is sealed. While being joined to the seal surface 5 of the cylinder head 11 via the member 4, it is fastened to the cylinder head 11 by the bolt 3.

  Here, the inclined surface 71A of the present embodiment constitutes the first inclined surface of the present invention, and the inclined surface 72A constitutes the second inclined surface of the present invention. Moreover, the outer edge 73A of the connection wall part 73 comprises the outer edge of this invention.

1, 2, and 8, in the top view of the cylinder head 11, the fuel pump mounting bracket 42 has a second side wall 72 that is a part of the fuel pump mounting bracket 42 as a bearing support portion 33 </ b> A (see FIG. 7). ) And the cylinder head 11 so as to overlap.
For this reason, the fuel pump 41 is attached to the fuel pump mounting bracket 42 so as to overlap the upper portion of the left side wall 33 in the top view of the cylinder head 11.

  12 and 13, a fastening portion 78 is formed on the second side wall portion 72. A through hole 78 a is formed in the fastening portion 78, and a case member described later is fixed to the fastening portion 78. In FIG. 1, the second side wall portion 72 of the present embodiment is located between the ignition coil 2 and the cam angle sensor 62.

  2, 3, and 5, screw grooves 11 </ b> A are formed on the outer peripheral edges of the rear side wall portion 31, the front side wall portion 32, and the left side wall portion 33 of the cylinder head 11. Fitted together.

  In FIG. 1, a through-hole 12A is formed on the outer peripheral edge of the cylinder head cover 12, and the cylinder head cover 12 is fastened to the cylinder head 11 by fitting the bolt 3 into the thread groove 11A through the through-hole 12A.

In FIG. 1, among the through holes 12A, the inner diameters of the through hole 12a closest to the inclined surface 71A and the through hole 12b closest to the inclined surface 72A are formed smaller than the inner diameters of the other through holes 12A.
Here, the bolt 3 of this Embodiment comprises the fastener of this invention. Moreover, the through-hole 12a comprises the 1st through-hole of this invention, and the through-hole 12b comprises the 2nd through-hole of this invention.

  In FIGS. 1, 2, 4, 6, and 7, a vacuum pump 82 is attached to the second side wall 72 and the left side wall 33 of the fuel pump mounting bracket 42 via a case member 81. That is, the case member 81 of the present embodiment is provided between the vacuum pump 82 and the left side wall portion 33.

  The vacuum pump 82 is fixed to the second side wall portion 72 together with the case member 81 by fitting bolts 76E into the through holes 78a of the second side wall portion 72 through the case member 81 (see FIG. 8).

4 and 6, the lower end of the case member 81 is fixed to the left wall 33 of the cylinder head 11 with a bolt 76F.
The vacuum pump 82 is connected to the left end portion 13a of the intake camshaft 13 and is driven by the intake camshaft 13 to generate a negative pressure and supply the negative pressure to a brake booster or the like.

  7 and 8, the sensing rotor 61 is accommodated in the case member 81. In the engine 1 of the present embodiment, the cylinder head 11 is connected to the pump drive cam 13B by the left side wall portion 33 and the second side wall portion 72. Are separated into a cam chamber 63 for accommodating the sensor rotor and a detection chamber 64 for accommodating the sensing rotor 61 and the cam angle sensor 62.

  Here, the left side wall portion 33 of the present embodiment constitutes a partition wall and a side wall of the present invention, and the vacuum pump 82 constitutes an auxiliary machine of the present invention. Further, the fuel pump mounting bracket 42 of the present embodiment constitutes an accessory mounting bracket of the present invention.

  A cooling water passage and a thermostat (not shown) are provided in the lower part of the case member 81 in contact with the left side wall 33, and a water jacket (not shown) formed inside the cylinder head 11 is provided in the cooling water passage. The flowing cooling water is discharged.

  This cooling water passage is partitioned from the detection chamber 64, which is a space above the case member 81 in which the left end portion 13 a of the intake cam shaft 13, the sensing rotor 61, and the cam angle sensor 62 are accommodated. Thereby, the cooling chamber does not flow from the cooling water passage to the detection chamber 64.

  In FIG. 1 and FIG. 2, the bolt 76 </ b> C that is spaced apart from the bearing support portion 33 </ b> A of the left side wall portion 33 in the axial direction of the intake cam shaft 13 is a case with respect to the direction orthogonal to the axial direction of the intake cam shaft 13. The cylinder head 11 is installed so as to overlap the member 81.

  In other words, in FIG. 5, the bolt hole 31 </ b> B into which the bolt 76 </ b> C is fitted is formed in the cylinder head 11 so as to overlap the case member 81 in the direction orthogonal to the axial direction of the intake camshaft 13.

  In FIG. 7, the pump drive cam 13 </ b> B is adjacent to the left side wall 33 inside the cam chamber 63, and the sensing rotor 61 is adjacent to the left side wall 33 inside the detection chamber 64. That is, the pump drive cam 13B and the sensing rotor 61 are provided so as to sandwich the left side wall portion 33, the second side wall portion 72, and the bearing portion 13b, and the bearing portion 13b is the first side wall portion 33 and the fuel pump mounting bracket 42. 2 is rotatably supported by the side wall 72.

  In FIG. 10, the cam angle sensor 62 is attached to the case member 81. The cam angle sensor 62 includes a main body 62A having a signal extraction coupler, and a detection element 62B that protrudes from the main body 62A toward the sensing rotor 61 and faces the sensing rotor 61 radially outward of the sensing rotor 61. ing. In addition, the detection element 62B of this Embodiment comprises the detection part of this invention.

  In the cam angle sensor 62, the protruding direction of the detecting element 62B from the main body 62A is orthogonal to the axial direction of the intake camshaft 13, and the detecting element 62B is in the moving direction A of the plunger 52 of the fuel pump 41. The protruding direction B is orthogonal.

  In the cam chamber 63 of the cylinder head 11 of the present embodiment, the contact surface between the intake cam 13A and the rocker arm 19, the contact surface between the exhaust cam 14A and the rocker arm (not shown), and the contact between the roller 52a of the plunger 52 and the pump drive cam 13B. Lubricating oil is supplied to the surface.

  For example, this oil passes through an oil passage (not shown) formed in the extending direction of the intake cam 13A and the exhaust cam 14A in the intake cam 13A and the exhaust cam 14A from the main oil gallery and is driven by the pump 52 and the roller 52a of the plunger 52. Supplied to the contact surface with the cam 13B.

Next, the operation will be described.
First, a method for attaching the cylinder head cover 12 to the cylinder head 11 will be described. In order to attach the cylinder head cover 12 to the cylinder head 11, the protrusion 4 a of the seal member 4 is inserted into the recess 12 </ b> B of the cylinder head cover 12, and the seal member 4 is attached to the bottom surface of the cylinder head cover 12.

  Next, the cylinder head cover 12 is mounted on the deck surfaces 31C, 32C, 33C via the seal member 4, and the corners of the cylinder head cover 12 are pressed against the inclined surfaces 71A, 72A of the fuel pump mounting bracket 42 via the seal member 4. .

Thereby, the cylinder head cover 12 is positioned with respect to the cylinder head 11 in the direction orthogonal to the axial direction of the intake cam shaft 13 and the axial direction of the intake cam shaft 13. When the cylinder head cover 12 is positioned with respect to the cylinder head 11, the positions of the thread groove 11 </ b> A of the cylinder head 11 and the through holes 12 a and 12 b of the cylinder head cover 12 are aligned.
In this state, the cylinder head cover 12 is fastened to the cylinder head 11 by fitting the bolt 3 into the screw groove 11A through the through hole 12A.

Here, when the accessory mounting bracket is a flat-shaped accessory mounting bracket attached to the deck surface 31C of the rear side wall 31, the cylinder head cover 12 is attached to the cylinder head 11 via the seal member 4. Think.

In this case, the surface of both end portions of the axis Direction of the intake camshaft 13, so that the facing outwardly relative to the direction of this. Thus, when mounting the cylinder head cover 12 to the cylinder head 11, when the cylinder head cover 12 is displaced in the axial direction toward the intake camshaft 13, one of the accessory mounting bracket definitive the axis Direction of the intake camshaft 13 Although the seal member sandwiched between the the surface and the cylinder head cover 12 is compressed, the sealing member is not compressed sandwiched between the other surface and the cylinder head cover 12 in the axial direction accessory mounting bracket definitive the direction of the intake camshaft 13. For this reason, the amount of compression of the seal member is not sufficient, and the sealing performance between the cylinder head 11 and the cylinder head cover 12 is deteriorated.

On the other hand, according to the engine 1 of the present invention, the fuel pump mounting bracket 42 faces the axial direction of the intake camshaft 13 at the axial end of the intake camshaft 13 of the first side wall 71. In addition, an inclined surface 71A extending upward from the deck surface 31C toward the connecting wall portion 73 is provided, and an end portion of the second side wall portion 72 in a direction orthogonal to the axis of the intake cam shaft 13 is orthogonal to the intake cam shaft 13. The connecting wall portion 73 has an inclined surface 72A that extends in the direction toward the connecting wall portion 73 from the deck surface 33C and continues to the inclined surface 71A, the inclined surface 72A, and the inclined surface 71A and the inclined surface 72A. The outer edge 73 </ b> A constitutes a seal surface 5 to be sealed by the seal member 4.

  Thus, when the cylinder head cover 12 is attached to the cylinder head 11 via the seal member 4, the cylinder head cover 12 is displaced in the axial direction of the intake camshaft 13 with respect to the cylinder head 11, and the inclined surface 71 </ b> A of the fuel pump attachment bracket 42. When the seal member 4 sandwiched between the cylinder head cover 12 and the cylinder head cover 12 is compressed, the inclined surface 72A of the fuel pump mounting bracket 42 and the cylinder perpendicular to the direction of displacement (in this case, the axial direction of the intake camshaft 13). The inclined portion 4C maintains an appropriate amount of compression without reducing the amount of compression of the inclined portion 4C of the seal member 4 sandwiched between the head covers 12.

Further, the cylinder head cover 12 is displaced in a direction perpendicular to the axis of the intake camshaft 13 with respect to the cylinder head 11, and the seal member 4 sandwiched between the inclined surface 72A of the fuel pump mounting bracket 42 and the cylinder head cover 12 is compressed. In this case, the inclined portion of the seal member 4 sandwiched between the inclined surface 71A of the fuel pump mounting bracket 42 and the cylinder head cover 12 that is orthogonal to the direction of deviation (in this case, the direction orthogonal to the axial direction of the intake camshaft 13). The inclined portion 4B maintains an appropriate compression amount without changing the compression amount of 4B.

  As a result, the compression amount of the inclined portions 4B and 4C sandwiched between the inclined surface 71A and the inclined surface 72A and the cylinder head cover 12 can be made appropriate to prevent the sealing performance between the cylinder head 11 and the cylinder head cover 12 from being deteriorated.

  Further, according to the engine 1 of the present embodiment, a plurality of through holes 12A through which the bolts 3 pass are formed on the outer peripheral edge of the cylinder head cover 12, and the through hole that is closest to the inclined surface 71A among the through holes 12A. 12a and the inner diameter of the through hole 12b closest to the inclined surface 72A were made smaller than the inner diameters of the other through holes 12A.

  Thereby, since the clearance of the bolt 3 with respect to the through hole 12a and the through hole 12b can be reduced, the portion of the cylinder head cover 12 located in the vicinity of the fuel pump mounting bracket 42 is in the axial direction of the intake cam shaft 13 and the intake cam shaft 13. It is possible to suppress the displacement in the orthogonal direction.

  For this reason, the amount of compression of the sealing member 4 interposed between the inclined surface 71A and the inclined surface 72A and the cylinder head cover 12 is made more effective and the sealing performance between the cylinder head 11 and the cylinder head cover 12 is more effective. Can be improved.

  According to the engine 1 of the present embodiment, the sensing rotor 61 is provided at the left end portion 13a of the intake camshaft 13, and the cam angle sensor 62 detects the protruding portion 61A of the sensing rotor 61 when the intake camshaft 13 rotates. As a result, the rotation angle of the intake camshaft 13 is detected.

  The detection information of the cam angle sensor 62 is output to a controller (not shown), and the controller calculates the rotation speed, rotation position, and the like of the intake camshaft 13 based on the detection information of the cam angle sensor 62.

  On the other hand, when the ignition plug 2 is ignited by the ignition coil 2, the cam angle sensor 62 may malfunction due to electromagnetic waves generated when the ignition coil 2 is ignited, and the cam angle sensor 62 is adversely affected by electromagnetic waves from the ignition coil 2. It is necessary not to receive.

  According to the engine 1 of the present embodiment, the cylinder head 11 rotatably supports the intake camshaft 13, and the cylinder head 11 is supported by the cam chamber 63 that houses the pump drive cam 13B, the sensing rotor 61, and the cam angle. It has a left side wall portion 33 that is partitioned into a detection chamber 64 that houses the sensor 62.

  Thereby, the ignition coil 2 and the cam angle sensor 62 can be electrically interrupted by the left side wall portion 33, and the cam angle sensor 62 can be prevented from being adversely affected by the electromagnetic waves of the ignition coil 2.

  Further, in the engine 1 of the present embodiment, the contact surface between the pump drive cam 13B and the roller 52a is lubricated by supplying lubricating oil to the contact surface between the pump drive cam 13B and the roller 52a of the plunger 52. Is done. This oil is scattered around after lubricating the contact surface between the pump drive cam 13B and the roller 52a.

  According to the engine 1 of the present invention, the cylinder head 11 has the left wall 33 that partitions the cylinder head 11 into a cam chamber 63 that houses the pump drive cam 13B and a detection chamber 64 that houses the sensing rotor 61 and the cam angle sensor 62.

  As a result, the detection chamber 64 that houses the cam angle sensor 62 can be isolated from the cam chamber 63 that houses the pump drive cam 13B, and oil that lubricates the roller 52a and the pump drive cam 13B is transferred from the cam chamber 63 to the detection chamber 64. It is possible to prevent scattering.

  Therefore, the cam angle sensor 62 can be reliably prevented from detecting oil, and the rotation angle of the sensing rotor 61 can be accurately detected by the cam angle sensor 62. As a result, the rotation angle of the intake camshaft 13 can be accurately detected.

  On the other hand, the fuel pump 41 of the present embodiment is configured to discharge fuel pressurized by the plunger 52 moving forward and backward by the pump drive cam 13B. For this reason, the pump drive cam 13B receives a reaction force from the fuel pump 41, and the intake camshaft 13 receives torsional torque and bending load.

  On the other hand, according to the engine 1 of the present embodiment, the partition wall is constituted by the left side wall portion 33 of the cylinder head 11 so that the cam chamber 63 is positioned inside the cylinder head 11 and the detection chamber 64 is provided. It was located outside the cylinder head 11.

  In addition to this, the left end portion 13a of the intake camshaft 13 is rotatably supported by the left side wall portion 33, and the left end portion 13a extends to the detection chamber 64 outside the left side wall portion 33 with respect to the cam chamber 63, The pump drive cam 13B is adjacent to the left side wall 33 inside the cam chamber 63, and the sensing rotor 61 is adjacent to the left side wall 33 inside the detection chamber 64.

  As a result, the pump drive cam 13B can be positioned inside the cylinder head 11 from the left side wall 33, and the sensing rotor 61 can be attached to the left end 13a of the intake camshaft 13 that extends outward from the left side wall 33.

  Therefore, when the fuel pump 41 is driven by the rotation of the pump drive cam 13B, the pump drive cam 13B and the sensing rotor 61 are provided on the left end 13a of the intake camshaft 13 outside the left wall 33. Thus, even if the intake camshaft 13 receives torsional torque or bending load due to the reaction force from the fuel pump 41, the rigidity of the intake camshaft 13 can be increased.

  As a result, it is possible to prevent the left end portion 13a of the intake camshaft 13 extending outside the left side wall portion 33 from vibrating, and the cam angle sensor 62 can reliably detect the rotation angle of the sensing rotor 61.

  In addition, according to the engine 1 of the present embodiment, the fuel pump mounting bracket 42 for mounting the fuel pump 41 to the cylinder head 11 is provided, and the fuel pump mounting bracket 42 extends in the axial direction of the intake camshaft 13. A first side wall portion 71 attached to the upper surface of the rear side wall portion 31 of the cylinder head 11, extending from the first side wall portion 71 along the left side wall portion 33, and fixed to the upper surface of the left side wall portion 33. The second side wall 72 includes a first side wall 71 and a connecting wall 73 that connects the second side wall 72.

  Thereby, the rigidity of the left side wall portion 33 can be increased by the amount provided with the fuel pump mounting bracket 42, and the rigidity of the intake camshaft 13 can be increased more effectively. Thereby, it can prevent more effectively that the left end part 13a of the intake cam shaft 13 extended outside rather than the left side wall part 33 vibrates.

  Further, since the cylinder head cover 12 of the present embodiment is made of a resin material, the cylinder head 11 and the fuel pump mounting bracket 42 are made of metal in order to enhance the electromagnetic wave shielding effect. Since the head cover 12 can be reduced in weight, the engine 1 can be reduced in weight.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  DESCRIPTION OF SYMBOLS 1 ... Engine (internal combustion engine), 3 ... Bolt (fastener), 4 ... Seal member, 5 ... Sealing surface, 11 ... Cylinder head, 12 ... Cylinder head cover, 12A. .. Through hole, 12a ... Through hole (first through hole), 12b ... Through hole (second through hole), 13 ... Intake cam shaft (cam shaft), 31 ... Rear Side wall portion (first wall portion), 31C ... deck surface (first deck surface), 33 ... left side wall portion (second wall portion), 33C ... deck surface (second deck) Surface), 42 ... fuel pump mounting bracket (auxiliary device mounting bracket), 71 ... first side wall, 71A ... inclined surface (first inclined surface), 72 ... second side wall Part, 72A ... inclined surface (second inclined surface), 73 ... connecting wall, 73A ... outer edge

Claims (2)

A first wall portion extending in the axial direction of the cam shaft and having a flat first deck surface on the upper surface, and extending in a direction perpendicular to the axial direction end portion of the cam shaft of the first wall portion and flat on the upper surface A cylinder head comprising a second wall having a second deck surface;
Extending along the first deck surface, a first side wall portion attached to the first deck surface, continuous to the first side wall portion so as to extend in a direction orthogonal to the first side wall portion, An auxiliary machine that has a second side wall part attached to the second deck surface and a connecting wall part that connects the first side wall part and the second side wall part, and attaches the auxiliary machine to the cylinder head. An internal combustion engine comprising: a mounting bracket; a cylinder head cover that is joined to the cylinder head and the accessory mounting bracket via a seal member, and fastened to the cylinder head by a fastener;
The accessory mounting bracket faces the axial direction end of the cam shaft of the first side wall portion, and faces upward in the axial direction of the cam shaft and from the first deck surface toward the connecting wall portion. A first inclined surface extending;
The second side wall portion has a second end portion extending in a direction orthogonal to the axis of the cam shaft and extending in a direction orthogonal to the cam shaft and extending upward from the second deck surface toward the connection wall portion. Having an inclined surface
The first inclined surface, the second inclined surface, and the outer edge of the connecting wall portion that continues to the first inclined surface and the second inclined surface constitute a seal surface that is sealed by the seal member. An internal combustion engine characterized by: A plurality of through holes through which the fastener passes are formed on an outer peripheral edge of the cylinder head cover, and the first through hole and the second inclined surface that are closest to the first inclined surface among the through holes. 2. The internal combustion engine according to claim 1, wherein the inner diameter of the second through hole closest to the inner diameter of the second through hole is made smaller than the inner diameters of the other through holes.

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