WO2015151767A1 - Mounting structure for fuel pump - Google Patents

Mounting structure for fuel pump Download PDF

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Publication number
WO2015151767A1
WO2015151767A1 PCT/JP2015/057537 JP2015057537W WO2015151767A1 WO 2015151767 A1 WO2015151767 A1 WO 2015151767A1 JP 2015057537 W JP2015057537 W JP 2015057537W WO 2015151767 A1 WO2015151767 A1 WO 2015151767A1
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WO
WIPO (PCT)
Prior art keywords
fuel pump
side wall
cylinder head
wall portion
pump mounting
Prior art date
Application number
PCT/JP2015/057537
Other languages
French (fr)
Japanese (ja)
Inventor
裕太郎 小杉
Original Assignee
スズキ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by スズキ株式会社 filed Critical スズキ株式会社
Priority to CN201580000168.5A priority Critical patent/CN105143657B/en
Priority to DE112015000036.4T priority patent/DE112015000036B4/en
Publication of WO2015151767A1 publication Critical patent/WO2015151767A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads

Definitions

  • the present invention relates to a fuel pump mounting structure, and more particularly to a fuel pump mounting structure for supplying fuel to an internal combustion engine mounted on a vehicle such as an automobile.
  • the fuel pump is attached to the cylinder head by being sandwiched between a semicircular cutout formed in the outer surface portion of the cylinder head and a semicircular cutout formed in the wall portion of the support member. .
  • This fuel pump is driven by a pump drive cam of the cam shaft.
  • the fuel pump is arranged substantially horizontally and perpendicular to the axial direction of the horizontal camshaft. For this reason, in said attachment structure, enlarging the full length of an engine is suppressed.
  • the support member since the support member has a plurality of cam caps, the fuel pump is firmly supported by the cylinder head.
  • the above-described mounting structure has a problem that noise is generated by vibration or the ride comfort of the vehicle is deteriorated.
  • a reinforcing member is provided in the mounting structure to suppress vibration or the rigidity of the fuel pump is increased, the weight of the mounting structure or the fuel pump increases or the manufacturing cost increases. There's a problem.
  • the fuel pump is supported on the side surface portion of the cylinder head by the support member, and is disposed so as to be substantially horizontal with respect to the upper surface of the cylinder head. For this reason, in the above-described mounting structure, there is a problem in that the degree of freedom of arrangement of components such as intake manifold piping arranged on the side surface of the cylinder head is reduced.
  • the present invention has been made in order to solve the above-described problems, and has high rigidity without increasing the weight and manufacturing cost as compared with the conventional one, and the side surface portion of the cylinder head. It is an object of the present invention to provide a fuel pump mounting structure capable of increasing the degree of freedom in arrangement.
  • a first aspect of the present invention is a fuel pump mounting structure driven by a pump drive cam of a cam shaft rotatably supported by a cylinder head, wherein the fuel pump is attached to the cylinder head.
  • a fuel pump mounting bracket to be mounted the fuel pump mounting bracket having a first side wall extending in an axial direction of the cam shaft, a second side wall extending in a direction intersecting with the cam shaft, and a first side wall; And a fuel pump mounting boss for mounting the fuel pump, and the fuel pump mounting boss on the first side wall, the second side wall and the connection wall. It is composed of what is supported.
  • the camshaft is an intake-side camshaft
  • the fuel pump mounting boss is positioned above the cylinder head and opens toward the intake-side camshaft. It may be.
  • the fuel pump mounting bracket has a fastening portion for fastening the vacuum pump driven by the camshaft, the fastening portion is located above the connecting wall portion, and the fuel pump mounting You may make it locate in the side spaced apart from the cam shaft of a boss
  • the second side wall portion has a bearing support portion that rotatably supports the cam shaft from above, and the bearing support portion is arranged in a direction perpendicular to the axis of the cam shaft. You may make it have a fastening hole on both sides.
  • a connection part is a 1st connection point where a 1st side wall part and a 2nd side wall part cross, a 1st connection point where a connection part and a 1st side wall part are connected, a connection part, It may have a 2nd connection point with which the 2nd side wall part is connected, and it may be made for an intersection, a 1st connection point, and a 2nd connection point to form a triangle.
  • the connecting portion is formed in a flat shape and has a seal member mounting surface for mounting a seal member for sealing the cylinder head cover and the cylinder head disposed on the upper portion of the cylinder head. Also good.
  • the fuel pump mounting bracket may be formed integrally with a cylinder head cover disposed on the cylinder head.
  • the fuel pump mounting boss is supported by the three wall portions of the first side wall portion, the second side wall portion, and the connecting wall portion of the fuel pump mounting bracket.
  • the rigidity of the fuel pump mounting boss portion is increased without increasing the weight and the manufacturing cost.
  • the fuel pump mounting boss is located above the cylinder head and opens toward the intake-side camshaft. Therefore, the fuel pump mounting bracket must be provided on the side wall of the cylinder head. Disappears.
  • the fuel pump mounting boss is supported by the three wall portions of the first side wall portion, the second side wall portion, and the connecting wall portion of the fuel pump mounting bracket, and is positioned above the cylinder head, and is located on the intake side. Since the opening is directed toward the camshaft, the fuel pump mounting boss portion can be disposed on the upper portion of the cylinder head. As a result, the degree of freedom in installing the intake manifold piping is increased.
  • the vacuum pump is fastened to the fuel pump mounting bracket at the fastening portion located above the connecting wall portion and located on the side away from the cam shaft of the fuel pump mounting boss portion.
  • the rigidity of the mounting structure is enhanced by the fuel pump mounting bracket and the vacuum pump.
  • the bearing support part of a 2nd side wall part has a fastening hole in the both sides of a bearing support part in the direction orthogonal to the axis line of a cam shaft, a bearing support part straddles a cam shaft and both sides And is fastened to the cylinder head via a fastening hole. As a result, the bearing support portion is prevented from being deformed so as to fall down.
  • a load is applied to the first side wall portion of the fuel pump mounting bracket by the pump driving cam in a direction away from the cam shaft. Since the intersection, the first connection point, and the second connection point form a triangle, the applied load can be effectively transmitted from the first side wall to the second side wall, and deformation of the first side wall is suppressed. Is done.
  • a part of Linder head cover can be attached to a connection wall part via a sealing member, the rigidity of a connection wall part is improved and the bearing support part of a 2nd side wall part falls down. Thus, the deformation is suppressed.
  • the fuel pump mounting bracket is formed integrally with the cylinder head cover disposed on the upper portion of the cylinder head, it is not necessary to provide the fuel pump mounting bracket separately from the cylinder head cover. The number of parts is reduced, and an increase in manufacturing cost is suppressed.
  • FIG. 1 is a diagram showing an embodiment of a fuel pump mounting structure according to the present invention, and is a plan view of a vehicle engine.
  • FIG. 2 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a side view of the engine as viewed from the left side of the vehicle.
  • FIG. 3 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a perspective view of the upper part of the engine as viewed from the left side of the vehicle with the cylinder head cover removed.
  • FIG. 4 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a perspective view of the upper part of the engine as viewed from the front side of the vehicle with the cylinder head cover removed.
  • FIG. 1 is a diagram showing an embodiment of a fuel pump mounting structure according to the present invention, and is a plan view of a vehicle engine.
  • FIG. 2 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a side view of the
  • FIG. 5 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a cross-sectional view taken along the line VV of FIG.
  • FIG. 6 is a view showing an embodiment of the fuel pump mounting structure 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. 7 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a perspective view of the fuel pump mounting bracket as viewed from the front side of the vehicle.
  • FIGS. 1 to 5 show an engine having a fuel pump mounting structure according to the present embodiment
  • FIGS. 6 and 7 show a fuel pump mounting bracket.
  • the engine 1 is a horizontal four-cycle engine 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 twice in a cylinder.
  • the engine 1 according to this embodiment includes a cylinder head 11, an intake camshaft 12 as a cam shaft, an exhaust camshaft 13, a fuel pump 14, and a fuel pump mounting bracket 15. I have.
  • the fuel pump mounting bracket 15 is fixed to the cylinder head 11 with a plurality of bolts 16.
  • a cylinder head cover 17 is attached on the cylinder head 11.
  • the fuel pump mounting structure includes a cylinder head 11, an intake camshaft 12, a fuel pump mounting bracket 15, and a bolt 16.
  • the engine 1 includes a low-pressure fuel supply pipe 19 that supplies fuel to the fuel pump 14, and a fuel supply pipe 21 that discharges the pressure-regulated fuel from the fuel pump 14. And a vacuum pump 23.
  • the engine 1 includes a delivery pipe 22 that supplies fuel discharged from a fuel supply pipe 21 to a fuel injection unit (not shown).
  • the engine 1 includes an intake manifold 24, an exhaust manifold 25, a cylinder block (not shown) that houses a piston (not shown), and a crankcase (not shown) that houses a crankshaft (not shown).
  • the engine 1 outputs the power by converting the reciprocating motion of the piston into the rotational motion of the crankshaft.
  • the cylinder head 11 includes a rear side wall portion 31, a front side wall portion 32, a left side wall portion 33, and a right side wall portion 34.
  • An upper opening 35 is formed on the upper surface of the cylinder head 11.
  • the lower portion of the cylinder head 11 has a bottom side wall portion.
  • the external appearance of this cylinder head 11 is a rectangular parallelepiped shape. Inside the cylinder head 11 are formed combustion chambers, intake ports, exhaust ports, intake valves and exhaust valve housings, water jackets, etc., not shown, corresponding to a plurality of cylinders.
  • the front, rear, left, and right and up and down directions in the drawing represent directions viewed from the driver's seat of the vehicle on which the engine 1 is mounted. Indicated by an arrow.
  • the present invention is not limited to the engine arrangement direction of the present embodiment.
  • an intake manifold 24 connected to each intake port is attached to the rear side wall portion 31, and air flowing through an air cleaner (not shown) is drawn into each combustion chamber from each intake port.
  • a mounting boss (not shown) in which a screw hole is formed is provided above the vicinity of the left side wall 33 of the rear side wall 31 in the cylinder head 11.
  • the fuel pump mounting bracket 15 is fixed to the cylinder head 11 by coupling the bolt 16 to the screw hole.
  • an exhaust manifold 25 connected to each exhaust port is attached to the front side wall portion 32.
  • Each exhaust port is exhausted from each combustion chamber.
  • the exhaust gas flowing through each exhaust port flows to an exhaust gas purification device (not shown) on the downstream side.
  • a vacuum pump 23 is attached to the left wall 33.
  • a mounting boss 33 a formed with a screw hole is provided at the center in the vehicle front-rear direction at the upper portion of the left side wall portion 33.
  • a plurality of mounting bosses 31 a, 32 a, and 33 a formed with screw holes are provided above the rear side wall portion 31, the front side wall portion 32, and the left side wall portion 33.
  • the cylinder head cover 17 has bolts 36 inserted through the mounting holes. Then, the bolt 36 is screwed into any one of the mounting bosses 31 a, 32 a, and 33 a at the corresponding location, and the cylinder head cover 17 is fixed to the cylinder head 11.
  • a central portion of the upper opening 35 has a plurality of bearing support portions 35a for rotatably supporting the intake camshaft 12 via a cam bearing (not shown) and an exhaust camshaft 13 via a cam bearing (not shown). And a plurality of bearing support portions 35b that are rotatably supported.
  • a pair of screw holes are respectively formed on the front side and the rear side across the bearing support portions 35a and 35b, and the bolts 37 are coupled to the upper surface of the cylinder head 11 through the screw holes.
  • the bearing support portions 35 a and 35 b are fixed to the cylinder head 11.
  • the intake camshaft 12 is disposed on the rear side of the upper opening 35 of the cylinder head 11 so as to be parallel to the rear side wall portion 31.
  • the intake camshaft 12 drives the shaft 12a, a plurality of cams 12b provided corresponding to each cylinder so as to open and close the intake valve, a pump drive cam 12c for driving the fuel pump 14, and a vacuum pump 23.
  • a drive portion 12d formed on the left side in the axial direction (the vehicle left-right direction in the present embodiment).
  • the intake camshaft 12 has a plurality of cam caps 12e for fixing the cam bearings corresponding to the bearing support portions 35a of the upper opening 35 of the cylinder head 11, and the cam caps 12e as screw holes of the bearing support portions 35a.
  • the exhaust camshaft 13 is disposed in parallel with the front side wall portion 32 on the front side of the upper opening 35 of the cylinder head 11. Similar to the intake camshaft 12, the exhaust camshaft 13 has a shaft 13a and a plurality of cams 13b provided corresponding to each cylinder so as to open and close the exhaust valve.
  • the exhaust camshaft 13 has a plurality of cam caps 13c for fixing the cam bearings corresponding to the bearing support portions 35b of the upper opening 35 of the cylinder head 11, and the cam caps 13c as screw holes of the bearing support portions 35b.
  • a timing chain (not shown) is wound around a timing sprocket (not shown) provided on an intake cam sprocket, an exhaust cam sprocket and a crankshaft (not shown). Accordingly, the rotational power of the crankshaft is transmitted to the intake camshaft 12 and the exhaust camshaft 13 via the timing chain.
  • the fuel pump 14 has a pump body 41. As shown in FIG. 5, a plunger 42 and an electromagnetic valve 43 are provided in the pump main body 41. A spring 44 that biases the plunger 42 is provided below the fuel pump 14. As shown in FIGS. 1 and 4, the pump body 41 is provided with a connector 45. The connector 45 is electrically connected to a controller (not shown). The fuel pump 14 has a check valve (not shown).
  • the pump body 41 is sucked by an intake port 41a for sucking fuel, a discharge port 41b for discharging fuel, a pressure chamber 41c communicating with the suction port 41a and the discharge port 41b, and an electromagnetic valve 43. And a seat portion 41d for opening and closing the port 41a.
  • the pump body 41 includes a cylinder 41e that slidably accommodates the plunger 42, and a flange 41f that attaches the pump body 41 to the fuel pump mounting bracket 15.
  • the suction port 41 a is connected to the low-pressure fuel supply pipe 19.
  • the discharge port 41b is connected to the fuel supply pipe 21.
  • the discharge port 41b is provided with a check valve (not shown). When the fuel pressure in the pressure chamber 41c exceeds a predetermined value, the valve is opened, and fuel is discharged from the discharge port 41b into the fuel supply pipe 21.
  • the plunger 42 has a roller 42a that contacts the pump drive cam 12c, and a lifter member 42b that rotatably supports the roller 42a.
  • the lifter member 42b is pressed toward the pump drive cam 12c by a spring 44, and the roller 42a is in contact with the pump drive cam 12c with a predetermined pressing force.
  • the plunger 42 reciprocates by the rotational movement of the pump drive cam 12c.
  • the suction port 41a is opened, and the fuel is sucked into the pressure chamber 41c whose volume is increased, and the plunger 42 is moved by the rotation of the pump drive cam 12c.
  • the suction port 41a is closed, and the pressure of the fuel sucked into the pressure chamber 41c is increased.
  • the electromagnetic valve 43 has a solenoid controlled by a controller, and opens the seat portion 41d when sucking fuel from the suction port 41a, and closes the seat portion 41d when increasing the fuel pressure.
  • the fuel pump mounting bracket 15 includes a first side wall 51 extending in the axial direction of the intake camshaft 12 (the vehicle left-right direction in this embodiment), and the intake camshaft 12.
  • a second side wall 52 extending in a direction substantially perpendicular to the axial direction (the vehicle left-right direction in the present embodiment), and a connection for integrally connecting the first side wall 51 and the second side wall 52. It has the wall part 53, the fuel pump attachment boss
  • the case where the second side wall portion 52 extends in a direction substantially perpendicular to the axial direction of the intake camshaft 12 has been described.
  • the second side wall portion 52 has the intake cam.
  • the present invention can also be applied to a case where the shaft 12 extends in a direction intersecting with the axial direction without making a right angle to the axial direction of the shaft 12.
  • FIG. 7 shows a bottom surface 51a of the first side wall 51.
  • the bottom surface 51a contacts the upper surface 31b of the rear side wall 31 of the cylinder head 11 shown in FIG.
  • an upper surface 51 b is formed on the side opposite to the bottom surface 51 a of the first side wall portion 51.
  • the first side wall 51 has a fixed boss 51 c that is fixed to the upper surface 31 b of the cylinder head 11 on the upper opening 35 side.
  • the fixed boss 51c is formed with a through hole 51d that penetrates the upper surface 51b and the bottom surface 51a. As shown in FIGS. 3 and 4, the bolt 16 is inserted into the through hole 51 d.
  • FIG. 7 shows the bottom surface 52a of the second side wall 52.
  • the bottom surface 52a contacts the upper surface 33b of the left side wall 33 of the cylinder head 11 shown in FIG.
  • An upper surface 52 b is formed on the side opposite to the bottom surface 52 a of the second side wall portion 52.
  • the second side wall portion 52 has fixed boss portions 52c and 52d. These fixed bosses 52c and 52d are formed with through holes 52g as fastening holes that penetrate the upper surface 52b and the bottom surface 52a in the fixed boss portion 52c that is fixed to the upper surface 33b on the upper opening 35 side of the cylinder head 11. ing.
  • the fixed boss portion 52d is formed with a through hole 52i as a fastening hole that penetrates the upper surface 52b and the bottom surface 52a.
  • Bolts 16 are respectively inserted into the through holes 52g and 52i, and the fuel pump mounting bracket 15 is fixed to the cylinder head 11 side as shown in FIG.
  • the second side wall 52 is formed to be recessed from the bottom surface 52 a in a semicircular shape so as to support the bearing of the intake camshaft 12 from above, so that the intake camshaft 12 can be rotated from above. It has a bearing support portion 52h for supporting.
  • the through holes 52g and 52i of the fixed bosses 52c and 52d of the present embodiment are respectively formed on both sides of the bearing support portion 52h so as to sandwich the bearing support portion 52h in a direction orthogonal to the axis of the intake camshaft 12. .
  • These through holes 52g and 52i constitute the fastening holes of the present invention.
  • the connecting wall 53 connects the vicinity of the upper surface 51b of the first side wall 51 and the vicinity of the upper surface 52b of the second side wall 52, and has a plate-like body having a predetermined thickness. It consists of As shown in FIG. 6, the connecting wall portion 53 is formed flat on the upper surface side. The connecting wall portion 53 has a seal member attachment surface 53 a for attaching a seal member (not shown) that seals the cylinder head cover 17 and the cylinder head 11.
  • the connecting wall portion 53 has an intersection point where the vicinity of the upper surface 51 b of the first side wall portion 51 and the vicinity of the upper surface 52 b of the second side wall portion 52 are defined as P1, and the right end of the connecting wall portion 53.
  • the first connection point where the portion and the vicinity of the upper surface 51b of the first side wall 51 are connected is P2, and the second connection point where the left end portion of the connection wall 53 and the vicinity of the upper surface 52b of the second side wall 52 are connected.
  • Is P3, and points P1, P2, and P3 are connected by straight lines, a triangle is formed by P1, P2, and P3.
  • the fuel pump mounting boss portion 54 has a main body 54 a and a flange 54 b for fixing the fuel pump 14. As shown in FIG. 7, the main body 54a is formed with an attachment hole 54c that opens toward the intake camshaft 12 and attaches the fuel pump 14.
  • the main body 54 a is provided integrally with the front side portion of the first side wall portion 51, that is, the inner portion, and is provided integrally with the right side portion of the second side wall portion 52, that is, the inner portion, and in the vicinity of the intersection P 1 of the connecting wall portion 53. It is provided integrally with the part.
  • the wall portion surrounding the attachment hole 54c of the main body 54a is formed to be thicker than the first sidewall portion 51 and the second sidewall portion 52.
  • the flange 54b is formed so as to protrude toward the side away from the intake camshaft 12 toward the side opposite to the opening of the main body 54a (the rear side in the vehicle longitudinal direction).
  • the flange 54b has a flat mounting surface and a pair of screw holes. The fuel pump 14 comes into contact with the mounting surface of the flange 54b, and a bolt is screwed into the screw hole to fix the fuel pump 14 to the fuel pump mounting bracket 15.
  • the fastening portion 55 includes a protrusion 55 a formed so as to protrude further upward than the upper surface portion of the connection wall portion 53, and a flat surface 55 b formed flat so as to fasten the vacuum pump 23.
  • the protrusion 55a is provided with a screw hole 55c formed in the left-right direction.
  • a bolt 60 is screwed into the screw hole 55 c and fixed to the fuel pump mounting bracket 15.
  • the cylinder head cover 17 covers the upper opening 35 (see FIGS. 3 and 4) of the cylinder head 11.
  • the cylinder head cover 17 has a plurality of head attachment portions 17 a attached to the upper opening 35 and a bracket attachment portion 17 b attached to the fuel pump attachment bracket 15.
  • the head mounting portion 17a has a plurality of bolt through holes formed corresponding to the mounting bosses 31a, 32a and 33a 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. .
  • the bracket mounting portion 17b has bolt through holes formed corresponding to the screw holes 61 of the fuel pump mounting bracket 15. Bolts are inserted into the respective bolt through holes, and the cylinder head cover 17 is fixed to the cylinder head 11.
  • the low-pressure fuel supply pipe 19 connects the feed pump and the suction port 41a so that fuel in a fuel tank (not shown) mounted on the vehicle is supplied to the suction port 41a of the fuel pump 14 by the feed pump. is doing.
  • the fuel supply pipe 21 connects the discharge port 41 b of the fuel pump 14 and the delivery pipe 22, and the fuel whose pressure is increased in the pressure chamber 41 c of the fuel pump 14 is supplied to the delivery pipe 22. Supply.
  • the delivery pipe 22 is connected to a plurality of injectors that inject fuel into the combustion chambers of the respective cylinders (not shown).
  • the delivery pipe 22 is provided with a fuel pressure sensor and a relief valve so that the fuel pressure can be maintained at a reference value in order to enable continuous fuel injection.
  • the vacuum pump 23 is connected to the drive portion 12d of the intake camshaft 12 and is driven by the intake camshaft 12.
  • the vacuum pump 23 has a pump body 23 a and a connecting housing 23 b that is connected to the left side wall 33 of the cylinder head 11 and the fuel pump mounting bracket 15.
  • the vacuum pump 23 generates a negative pressure and supplies the negative pressure to an element requiring a negative pressure such as a brake booster.
  • the intake manifold 24 shown in FIG. 1 and FIG. 2 collects a flange (not shown) connected to the rear side wall portion 31 of the cylinder head 11, a manifold connected to each intake port and introducing air into the intake port, and the manifolds.
  • a collecting pipe connected to the upstream intake pipe is provided.
  • the exhaust manifold 25 shown in FIG. 1 collects a manifold (not shown) connected to the front side wall portion 32 of the cylinder head 11, a manifold through which exhaust gas is connected to each exhaust port and exhausted from the exhaust port, and the manifold. It has a collecting pipe connected to a downstream exhaust pipe and an exhaust gas purification device.
  • the fuel pump mounting boss portion 54 includes the first side wall portion 51 and the second side wall portion of the fuel pump mounting bracket 15. Since it is supported by the three wall portions 52 and the connecting wall portion 53, the effect of increasing the rigidity of the fuel pump mounting boss portion can be obtained without increasing the weight and the manufacturing cost as compared with the conventional one.
  • the fuel pump mounting boss portion 54 is located above the cylinder head 11 and opens toward the intake camshaft 12. Therefore, it is not necessary to provide the fuel pump mounting bracket 15 on the side wall portion of the cylinder head 11.
  • the mounting boss portion such as the fuel pump mounting boss portion 54 of the mounting structure of the fuel pump 14 of the present embodiment is not formed in the conventional one described in Patent Document 1, the rigidity of the mounting structure cannot be ensured. There was a problem.
  • the fuel pump mounting boss portion 54 is provided, and the thickness of the wall portion surrounding the mounting hole 54c of the main body 54a of the fuel pump mounting boss portion 54 is the first. It is formed thicker than the thickness of the side wall 51 and the second side wall 52, and the rigidity is increased. As a result, an effect that the problem of rigidity of the conventional mounting structure is solved can be obtained.
  • the fuel pump mounting boss portion 54 is supported by the three wall portions of the first side wall portion 51, the second side wall portion 52, and the connecting wall portion 53 of the fuel pump mounting bracket 15, and is positioned above the cylinder head 11, Since it opens toward the intake camshaft 12, the fuel pump mounting boss portion 54 can be disposed on the cylinder head 11. As a result, there is an effect that the degree of freedom of installation of the piping of the intake manifold 24 is increased.
  • the fuel pump is provided with the fastening portion 55 that is located above the connecting wall portion 53 and that is located on the side away from the intake camshaft 12 of the fuel pump mounting boss portion 54.
  • a vacuum pump 23 is fastened to the mounting bracket 15. For this reason, when the fuel pump mounting bracket 15 and the vacuum pump 23 are fastened, the rigidity of the mounting structure is increased.
  • the bearing support 52 h in the direction in which the bearing support 52 h of the second side wall 52 is perpendicular to the axis of the intake camshaft 12. Since the through-holes 52g and 52i are provided on both sides, the bearing support portion 52h is fastened to the both sides of the intake camshaft 12 via the cylinder head 11 and the through-holes 52g and 52i. As a result, it is possible to obtain an effect that the bearing support portion 52h is prevented from being deformed so as to fall down.
  • the pump drive cam 12c causes the first side wall 51 of the fuel pump mounting bracket 15 to be inhaled.
  • a load is applied in a direction away from the camshaft 12.
  • the connection wall portion 53 forms a triangle by the intersection point P1, the first connection point P2, and the second connection point P3 (see FIGS. 6 and 7). The applied load can be effectively transmitted from the first side wall portion 51 to the second side wall portion 52, and an effect that deformation of the first side wall portion 51 is suppressed is obtained.
  • connection wall part 53 since a part of cylinder head cover 17 can be attached to the connection wall part 53 via a sealing member, the rigidity of the connection wall part 53 is improved, and the first The effect that it suppresses that the bearing support part 52h of the 2 side wall part 52 falls so that it may fall down is acquired.
  • the fuel pump mounting bracket 15 is configured as a single structure.
  • the fuel pump mounting bracket is a single unit. You may make it comprise by structures other than one structure.
  • the fuel pump mounting bracket may be configured as an integral structure formed integrally with a cylinder head cover disposed on the upper portion of the cylinder head.
  • the fuel pump mounting bracket is formed integrally with the cylinder head cover arranged on the upper part of the cylinder head, it is not necessary to provide the fuel pump mounting bracket separately from the cylinder head cover, and the number of parts is reduced and the manufacturing is performed. The effect that the increase in cost is suppressed is acquired.
  • Cylinder head 12 Intake camshaft (camshaft) 12c Pump drive cam 13 Exhaust cam shaft (cam shaft) 14 Fuel pump 15 Fuel pump mounting bracket 17 Cylinder head cover 23 Vacuum pump 51 First side wall portion 52 Second side wall portion 52g, 52i Through hole (fastening hole) 53 Connecting wall portion 53a Seal member mounting surface 54 Fuel pump mounting boss portion 55 Fastening portion P1 Intersection P2 First connecting point P3 Second connecting point

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Provided is a mounting structure for a fuel pump (14) driven by the pump drive cam (12c) of an intake camshaft (12) rotatably supported by a cylinder head (11). The mounting structure is provided with a fuel pump mounting bracket (15) for mounting the fuel pump (14) on the cylinder head (11). The fuel pump mounting bracket (15) has: a first sidewall section (51) extending in the direction of the axis of the intake camshaft (12); a second sidewall section (52) extending in the direction intersecting the camshaft; a connection wall section (53) for connecting the first sidewall section (51) and the second sidewall section (52); and a fuel pump mounting boss section (54) for mounting the fuel pump (14) thereon. The fuel pump mounting boss section (54) is supported by the first sidewall section (51), the second sidewall section (52), and the connection wall section (53).

Description

燃料ポンプの取付構造Fuel pump mounting structure
　本発明は、燃料ポンプの取付構造に関し、特に、自動車などの車両に搭載される内燃機関に燃料を供給する燃料ポンプの取付構造に関する。 The present invention relates to a fuel pump mounting structure, and more particularly to a fuel pump mounting structure for supplying fuel to an internal combustion engine mounted on a vehicle such as an automobile.
　従来、この種の燃料ポンプの取付構造として、例えば、特許文献１に記載のものが知られている。この取付構造では、燃料ポンプがカム軸の軸線方向と垂直で、シリンダヘッドの上面に対して略水平になるよう、燃料ポンプをシリンダヘッドの側面部に支持部材で支持されている。 Conventionally, as an attachment structure of this type of fuel pump, for example, the one described in Patent Document 1 is known. In this mounting structure, the fuel pump is supported on the side surface portion of the cylinder head by the support member so that the fuel pump is perpendicular to the axial direction of the cam shaft and substantially horizontal to the upper surface of the cylinder head.
　この燃料ポンプは、シリンダヘッドの外側面部に形成された半円状の切欠きと、支持部材の壁部に形成された半円状の切欠きと、により挟み込まれてシリンダヘッドに取り付けられている。この燃料ポンプは、カム軸のポンプ駆動カムによって駆動される。 The fuel pump is attached to the cylinder head by being sandwiched between a semicircular cutout formed in the outer surface portion of the cylinder head and a semicircular cutout formed in the wall portion of the support member. . This fuel pump is driven by a pump drive cam of the cam shaft.
　この構成により、上記の燃料ポンプは水平なカム軸の軸線方向と垂直で略水平に配置される。このため、上記の取付構造では、エンジンの全長を大きくすることが抑制される。また、上記の取付構造では、支持部材が複数のカムキャップを有しているので、燃料ポンプがシリンダヘッドに強固に支持される。 With this configuration, the fuel pump is arranged substantially horizontally and perpendicular to the axial direction of the horizontal camshaft. For this reason, in said attachment structure, enlarging the full length of an engine is suppressed. In the above mounting structure, since the support member has a plurality of cam caps, the fuel pump is firmly supported by the cylinder head.
特許第３８２６６９１号Japanese Patent No. 3826691
　しかしながら、このような特許文献１に記載の燃料ポンプの取付構造にあっては、シリンダヘッドの外側面部に燃料ポンプを取り付けるための切欠きが形成されている。このため、この取付構造では外側面部の剛性が低くなってしまうという問題がある。 However, in the fuel pump mounting structure described in Patent Document 1, a notch for mounting the fuel pump is formed on the outer surface of the cylinder head. For this reason, in this attachment structure, there exists a problem that the rigidity of an outer surface part will become low.
　このような特許文献１に記載の燃料ポンプの取付構造にあっては、支持部材の壁部にも燃料ポンプを取り付けるための切欠きが形成されている。したがって、この構造には、壁部の剛性が低くなってしまうという問題がある。このように、燃料ポンプの取付構造の剛性が低くなってしまうと、燃料ポンプがカム軸のポンプ駆動カムによって駆動される際に、燃料ポンプやその取付構造を構成する要素に振動が生じ易くなってしまう。 In the fuel pump mounting structure described in Patent Document 1, a notch for mounting the fuel pump is also formed in the wall portion of the support member. Therefore, this structure has a problem that the rigidity of the wall portion is lowered. As described above, if the rigidity of the fuel pump mounting structure is lowered, when the fuel pump is driven by the pump drive cam of the cam shaft, the fuel pump and the components constituting the mounting structure are likely to vibrate. End up.
　このため、上記の取付構造には、振動により騒音が発生したり、車両の乗り心地が悪化したりしてしまうという問題がある。上記の取付構造では、振動を抑制するよう取付構造に補強部材を設けたり、燃料ポンプの剛性を高めようとすると、取付構造や燃料ポンプの重量が増大したり、製造コストが高くなってしまうという問題がある。 For this reason, the above-described mounting structure has a problem that noise is generated by vibration or the ride comfort of the vehicle is deteriorated. In the above mounting structure, if a reinforcing member is provided in the mounting structure to suppress vibration or the rigidity of the fuel pump is increased, the weight of the mounting structure or the fuel pump increases or the manufacturing cost increases. There's a problem.
　上記の取付構造では、燃料ポンプがシリンダヘッドの側面部に支持部材で支持され、シリンダヘッドの上面に対して略水平になるよう配置されている。このため、上記の取付構造では、シリンダヘッドの側面部に配置される吸気マニホールドの配管などの構成要素の配置の自由度が小さくなってしまうという問題がある。 In the above mounting structure, the fuel pump is supported on the side surface portion of the cylinder head by the support member, and is disposed so as to be substantially horizontal with respect to the upper surface of the cylinder head. For this reason, in the above-described mounting structure, there is a problem in that the degree of freedom of arrangement of components such as intake manifold piping arranged on the side surface of the cylinder head is reduced.
　本発明は、上記のような問題を解決するためになされたものであり、従来のものと比較して、重量や製造コストが増加することなく、高い剛性を有するとともに、シリンダヘッドの側面部の配置の自由度を高めることができる燃料ポンプの取付構造を提供することを課題とする。 The present invention has been made in order to solve the above-described problems, and has high rigidity without increasing the weight and manufacturing cost as compared with the conventional one, and the side surface portion of the cylinder head. It is an object of the present invention to provide a fuel pump mounting structure capable of increasing the degree of freedom in arrangement.
　上記課題を解決するための、本発明の第１の態様は、シリンダヘッドに回転自在に支持されたカム軸のポンプ駆動カムによって駆動される燃料ポンプの取付構造において、燃料ポンプを上記シリンダヘッドに取り付ける燃料ポンプ取付ブラケットを備え、その燃料ポンプ取付ブラケットが、上記カム軸の軸線方向に延在する第１側壁部と、上記カム軸と交わる方向に延在する第２側壁部と、第１側壁部と第２側壁部とを連結する連結壁部と、燃料ポンプを取り付ける燃料ポンプ取付ボス部とを有し、燃料ポンプ取付ボス部が、第１側壁部、第２側壁部および連結壁部に支持されるものから構成されている。 In order to solve the above problems, a first aspect of the present invention is a fuel pump mounting structure driven by a pump drive cam of a cam shaft rotatably supported by a cylinder head, wherein the fuel pump is attached to the cylinder head. A fuel pump mounting bracket to be mounted, the fuel pump mounting bracket having a first side wall extending in an axial direction of the cam shaft, a second side wall extending in a direction intersecting with the cam shaft, and a first side wall; And a fuel pump mounting boss for mounting the fuel pump, and the fuel pump mounting boss on the first side wall, the second side wall and the connection wall. It is composed of what is supported.
　本発明の第２の態様としては、カム軸が、吸気側のカム軸であり、上記燃料ポンプ取付ボス部が、シリンダヘッドより上方に位置するとともに、吸気側のカム軸に向かって開口するようにしてもよい。 As a second aspect of the present invention, the camshaft is an intake-side camshaft, and the fuel pump mounting boss is positioned above the cylinder head and opens toward the intake-side camshaft. It may be.
　本発明の第３の態様としては、燃料ポンプ取付ブラケットが、カム軸により駆動されるバキュームポンプを締結する締結部を有し、締結部が、連結壁部より上方に位置するとともに、燃料ポンプ取付ボス部のカム軸から離隔する側に位置するようにしてもよい。 As a third aspect of the present invention, the fuel pump mounting bracket has a fastening portion for fastening the vacuum pump driven by the camshaft, the fastening portion is located above the connecting wall portion, and the fuel pump mounting You may make it locate in the side spaced apart from the cam shaft of a boss | hub part.
　本発明の第４の態様としては、第２側壁部が、カム軸を上方から回転可能に支持する軸受支持部を有し、軸受支持部がカム軸の軸線と直交する方向で軸受支持部の両側に締結孔を有するようにしてもよい。 As a fourth aspect of the present invention, the second side wall portion has a bearing support portion that rotatably supports the cam shaft from above, and the bearing support portion is arranged in a direction perpendicular to the axis of the cam shaft. You may make it have a fastening hole on both sides.
　本発明の第５の態様としては、連結部が、第１側壁部と第２側壁部とが交わる交点と、連結部と第１側壁部とが連結される第１連結点と、連結部と第２側壁部とが連結される第２連結点とを有し、交点と第１連結点と第２連結点とが三角形を形成するようにしてもよい。 As a 5th aspect of this invention, a connection part is a 1st connection point where a 1st side wall part and a 2nd side wall part cross, a 1st connection point where a connection part and a 1st side wall part are connected, a connection part, It may have a 2nd connection point with which the 2nd side wall part is connected, and it may be made for an intersection, a 1st connection point, and a 2nd connection point to form a triangle.
　本発明の第６の態様としては、連結部が、平坦状に形成され、シリンダヘッドの上部に配置されるシリンダヘッドカバーとシリンダヘッドとをシールするシール部材を取り付けるシール部材取付面を有するようにしてもよい。 As a sixth aspect of the present invention, the connecting portion is formed in a flat shape and has a seal member mounting surface for mounting a seal member for sealing the cylinder head cover and the cylinder head disposed on the upper portion of the cylinder head. Also good.
　本発明の第７の態様としては、燃料ポンプ取付ブラケットが、シリンダヘッドの上部に配置されるシリンダヘッドカバーと一体に形成されるようにしてもよい。 As a seventh aspect of the present invention, the fuel pump mounting bracket may be formed integrally with a cylinder head cover disposed on the cylinder head.
　このように上記の第１の態様によれば、燃料ポンプ取付ボス部が、燃料ポンプ取付ブラケットの第１側壁部、第２側壁部および連結壁部の３つの壁部で支持されるので、従来のものと比較して、重量や製造コストが増加することなく、燃料ポンプ取付ボス部の剛性が高まる。 Thus, according to the first aspect, the fuel pump mounting boss is supported by the three wall portions of the first side wall portion, the second side wall portion, and the connecting wall portion of the fuel pump mounting bracket. The rigidity of the fuel pump mounting boss portion is increased without increasing the weight and the manufacturing cost.
　その結果、燃料ポンプがカム軸のポンプ駆動カムによって駆動される際に、燃料ポンプやその取付構造を構成する要素の振動が低減され、振動により発生する騒音の問題や、車両の乗り心地の悪化の問題が解消される。 As a result, when the fuel pump is driven by the pump drive cam of the camshaft, the vibrations of the fuel pump and the elements constituting the mounting structure are reduced, causing problems of noise generated by the vibrations and worsening of the riding comfort of the vehicle. The problem is solved.
　上記の第２の態様によれば、燃料ポンプ取付ボス部が、シリンダヘッドより上方に位置し、吸気側のカム軸に向かって開口するので、燃料ポンプ取付ブラケットをシリンダヘッドの側壁部に設ける必要がなくなる。 According to the second aspect, the fuel pump mounting boss is located above the cylinder head and opens toward the intake-side camshaft. Therefore, the fuel pump mounting bracket must be provided on the side wall of the cylinder head. Disappears.
　その結果、シリンダヘッドの側壁部に燃料ポンプを取り付ける切欠きを形成する必要がなくなり、切欠き部分でシリンダヘッドの剛性が低下することがなくなり、側壁部を補強する必要がなくなる。 As a result, it is not necessary to form a notch for attaching the fuel pump to the side wall portion of the cylinder head, the rigidity of the cylinder head does not decrease at the notched portion, and the side wall portion need not be reinforced.
　また、燃料ポンプ取付ボス部が、燃料ポンプ取付ブラケットの第１側壁部、第２側壁部および連結壁部の３つの壁部で支持されるとともに、シリンダヘッドより上方に位置し、吸気側の前記カム軸に向かって開口するので、燃料ポンプ取付ボス部をシリンダヘッドの上部に配置することが可能となる。その結果、吸気マニホールドの配管の設置の自由度が大きくなる。 Further, the fuel pump mounting boss is supported by the three wall portions of the first side wall portion, the second side wall portion, and the connecting wall portion of the fuel pump mounting bracket, and is positioned above the cylinder head, and is located on the intake side. Since the opening is directed toward the camshaft, the fuel pump mounting boss portion can be disposed on the upper portion of the cylinder head. As a result, the degree of freedom in installing the intake manifold piping is increased.
　上記の第３の態様によれば、連結壁部より上方に位置し、燃料ポンプ取付ボス部のカム軸から離隔する側に位置する締結部で、燃料ポンプ取付ブラケットにバキュームポンプが締結されるので、燃料ポンプ取付ブラケットとバキュームポンプとにより、取付構造の剛性が高められる。このバキュームポンプの締結により、燃料ポンプ取付ボス部のカム軸から離隔する側がシリンダヘッドの内側方向に倒れ込むように変形することが抑制される。 According to the third aspect, the vacuum pump is fastened to the fuel pump mounting bracket at the fastening portion located above the connecting wall portion and located on the side away from the cam shaft of the fuel pump mounting boss portion. The rigidity of the mounting structure is enhanced by the fuel pump mounting bracket and the vacuum pump. By fastening the vacuum pump, the side of the fuel pump mounting boss portion that is separated from the cam shaft is prevented from being deformed so as to fall in the inner direction of the cylinder head.
　上記の第４の態様によれば、第２側壁部の軸受支持部がカム軸の軸線と直交する方向で軸受支持部の両側に締結孔を有するので、軸受支持部がカム軸を跨いで両側でシリンダヘッドと締結孔を介して締結される。その結果、軸受支持部が倒れ込むように変形することが抑制される。 According to said 4th aspect, since the bearing support part of a 2nd side wall part has a fastening hole in the both sides of a bearing support part in the direction orthogonal to the axis line of a cam shaft, a bearing support part straddles a cam shaft and both sides And is fastened to the cylinder head via a fastening hole. As a result, the bearing support portion is prevented from being deformed so as to fall down.
　上記の第５の態様によれば、燃料ポンプが駆動されると、ポンプ駆動カムによって燃料ポンプ取付ブラケットの第１側壁部には、カム軸から離隔する方向に荷重が加わるが、連結壁部が、交点と第１連結点と第２連結点とにより三角形を形成するので、加わる荷重を第１側壁部から第２側壁部に効果的に伝えることが可能となり、第１側壁部の変形が抑制される。 According to the fifth aspect, when the fuel pump is driven, a load is applied to the first side wall portion of the fuel pump mounting bracket by the pump driving cam in a direction away from the cam shaft. Since the intersection, the first connection point, and the second connection point form a triangle, the applied load can be effectively transmitted from the first side wall to the second side wall, and deformation of the first side wall is suppressed. Is done.
　上記の第６の態様によれば、シール部材を介して連結壁部にリンダヘッドカバーの一部を取り付けることができるので、連結壁部の剛性が高められ、第２側壁部の軸受支持部が倒れ込むように変形することが抑制される。 According to said 6th aspect, since a part of Linder head cover can be attached to a connection wall part via a sealing member, the rigidity of a connection wall part is improved and the bearing support part of a 2nd side wall part falls down. Thus, the deformation is suppressed.
　上記の第７の態様によれば、燃料ポンプ取付ブラケットが、シリンダヘッドの上部に配置されるシリンダヘッドカバーと一体に形成されるので、燃料ポンプ取付ブラケットをシリンダヘッドカバーと別体で設ける必要がなく、部品点数が削減され、製造コストの増大が抑制される。 According to the seventh aspect, since the fuel pump mounting bracket is formed integrally with the cylinder head cover disposed on the upper portion of the cylinder head, it is not necessary to provide the fuel pump mounting bracket separately from the cylinder head cover. The number of parts is reduced, and an increase in manufacturing cost is suppressed.
図１は、本発明の燃料ポンプの取付構造の一実施形態を示す図であり、車両のエンジンの平面図である。FIG. 1 is a diagram showing an embodiment of a fuel pump mounting structure according to the present invention, and is a plan view of a vehicle engine. 図２は、本発明の燃料ポンプの取付構造の一実施形態を示す図であり、車両の左側から見たエンジンの側面図である。FIG. 2 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a side view of the engine as viewed from the left side of the vehicle. 図３は、本発明の燃料ポンプの取付構造の一実施形態を示す図であり、シリンダヘッドカバーを取り外した状態で、車両の左側から見たエンジン上部の斜視図である。FIG. 3 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a perspective view of the upper part of the engine as viewed from the left side of the vehicle with the cylinder head cover removed. 図４は、本発明の燃料ポンプの取付構造の一実施形態を示す図であり、シリンダヘッドカバーを取り外した状態で、車両の前側から見たエンジン上部の斜視図である。FIG. 4 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a perspective view of the upper part of the engine as viewed from the front side of the vehicle with the cylinder head cover removed. 図５は、本発明の燃料ポンプの取付構造の一実施形態を示す図であり、図２のＶ－Ｖ断面図である。FIG. 5 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a cross-sectional view taken along the line VV of FIG. 図６は、本発明の燃料ポンプの取付構造の一実施形態を示す図であり、車両の左側から見た燃料ポンプ取付ブラケットの斜視図である。FIG. 6 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a perspective view of the fuel pump mounting bracket as viewed from the left side of the vehicle. 図７は、本発明の燃料ポンプの取付構造の一実施形態を示す図であり、車両の前側から見た燃料ポンプ取付ブラケットの斜視図である。FIG. 7 is a view showing an embodiment of the fuel pump mounting structure of the present invention, and is a perspective view of the fuel pump mounting bracket as viewed from the front side of the vehicle.
　以下、本発明の実施形態に係る燃料ポンプの取付構造を図面を参照して説明する。本実施形態に係る燃料ポンプの取付構造は、車両に搭載されるエンジンに適用したものである。図１～図５は、本実施形態に係る燃料ポンプの取付構造を備えたエンジンを示し、図６および図７は燃料ポンプ取付ブラケットを示す。 Hereinafter, a fuel pump mounting structure according to an embodiment of the present invention will be described with reference to the drawings. The fuel pump mounting structure according to this embodiment is applied to an engine mounted on a vehicle. FIGS. 1 to 5 show an engine having a fuel pump mounting structure according to the present embodiment, and FIGS. 6 and 7 show a fuel pump mounting bracket.
　まず、本実施形態に係る燃料ポンプの取付構造の構成を説明する。
　図１～図５は、本実施形態が適用されたエンジン１を示す。このエンジン１は、図示しないピストンが気筒を２往復する間に吸気行程、圧縮行程、膨張行程および排気行程からなる一連の４行程を行う横置きの４サイクルエンジンである。図３に示すように、本実施形態に係るエンジン１は、シリンダヘッド１１と、カム軸としての吸気カムシャフト１２と、排気カムシャフト１３と、燃料ポンプ１４と、燃料ポンプ取付ブラケット１５と、を備えている。燃料ポンプ取付ブラケット１５は、複数のボルト１６でシリンダヘッド１１に固定されている。図１および図２に示すように、シリンダヘッド１１の上には、シリンダヘッドカバー１７が取り付けられている。 First, the structure of the fuel pump mounting structure according to this embodiment will be described.
1 to 5 show an engine 1 to which the present embodiment is applied. The engine 1 is a horizontal four-cycle engine 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 twice in a cylinder. As shown in FIG. 3, the engine 1 according to this embodiment includes a cylinder head 11, an intake camshaft 12 as a cam shaft, an exhaust camshaft 13, a fuel pump 14, and a fuel pump mounting bracket 15. I have. The fuel pump mounting bracket 15 is fixed to the cylinder head 11 with a plurality of bolts 16. As shown in FIGS. 1 and 2, a cylinder head cover 17 is attached on the cylinder head 11.
　本実施形態に係る燃料ポンプの取付構造は、シリンダヘッド１１、吸気カムシャフト１２、燃料ポンプ取付ブラケット１５およびボルト１６を備えて構成されている。 The fuel pump mounting structure according to this embodiment includes a cylinder head 11, an intake camshaft 12, a fuel pump mounting bracket 15, and a bolt 16.
　図１～図３、および図５に示すように、エンジン１は、燃料ポンプ１４に燃料を供給する低圧燃料供給パイプ１９と、燃料ポンプ１４から調圧された燃料を吐出する燃料供給パイプ２１と、バキュームポンプ２３と、を備えている。図１に示すように、エンジン１は、燃料供給パイプ２１から吐出された燃料を図示しない燃料噴射ユニットに供給するデリバリパイプ２２を備えている。 As shown in FIGS. 1 to 3 and 5, the engine 1 includes a low-pressure fuel supply pipe 19 that supplies fuel to the fuel pump 14, and a fuel supply pipe 21 that discharges the pressure-regulated fuel from the fuel pump 14. And a vacuum pump 23. As shown in FIG. 1, the engine 1 includes a delivery pipe 22 that supplies fuel discharged from a fuel supply pipe 21 to a fuel injection unit (not shown).
　図１に示すように、エンジン１は、吸気マニホールド２４、排気マニホールド２５と、図示しないピストンを収容する図示しないシリンダブロックと、図示しないクランクシャフトを収容する図示しないクランクケースとを備えている。エンジン１は、上記ピストンの往復運動を上記クランクシャフトの回転運動に変換して動力を出力する。 As shown in FIG. 1, the engine 1 includes an intake manifold 24, an exhaust manifold 25, a cylinder block (not shown) that houses a piston (not shown), and a crankcase (not shown) that houses a crankshaft (not shown). The engine 1 outputs the power by converting the reciprocating motion of the piston into the rotational motion of the crankshaft.
　図１、図３に示すように、シリンダヘッド１１は、後側壁部３１と、前側壁部３２と、左側壁部３３と、右側壁部３４と、を備える。このシリンダヘッド１１の上面には、上部開口部３５が形成されている。このシリンダヘッド１１の下部には、底側壁部とを有する。このシリンダヘッド１１の外観は、直方体形状である。このシリンダヘッド１１の内部には複数の気筒に対応するそれぞれ図示しない燃焼室、吸気ポート、排気ポート、吸気バルブや排気バルブの収容部、ウオータジャケットなどが形成されている。 1 and 3, the cylinder head 11 includes a rear side wall portion 31, a front side wall portion 32, a left side wall portion 33, and a right side wall portion 34. An upper opening 35 is formed on the upper surface of the cylinder head 11. The lower portion of the cylinder head 11 has a bottom side wall portion. The external appearance of this cylinder head 11 is a rectangular parallelepiped shape. Inside the cylinder head 11 are formed combustion chambers, intake ports, exhaust ports, intake valves and exhaust valve housings, water jackets, etc., not shown, corresponding to a plurality of cylinders.
　ここで、本実施の形態では、説明の便宜を図るため、図中において前後、左右および上下の各方向は、エンジン１が搭載された車両の運転席から見た方向を表しており、各図面に矢印で示される。なお、本発明は、本実施形態のエンジン配置方向に限定されるものではない。 Here, in the present embodiment, for convenience of explanation, the front, rear, left, and right and up and down directions in the drawing represent directions viewed from the driver's seat of the vehicle on which the engine 1 is mounted. Indicated by an arrow. The present invention is not limited to the engine arrangement direction of the present embodiment.
　図１に示すように、後側壁部３１には、各吸気ポートと接続される吸気マニホールド２４が取り付けられ、図示しないエアクリーナを流通した空気が各吸気ポートから各燃焼室に吸入される。 As shown in FIG. 1, an intake manifold 24 connected to each intake port is attached to the rear side wall portion 31, and air flowing through an air cleaner (not shown) is drawn into each combustion chamber from each intake port.
　図１および図３に示すように、シリンダヘッド１１における後側壁部３１の左側壁部３３近傍の上方には、ねじ孔が形成された図示しない取付ボスが設けられている。上述したように、燃料ポンプ取付ブラケット１５は、ボルト１６を上記ねじ孔に結合させることでシリンダヘッド１１に固定される。 As shown in FIGS. 1 and 3, a mounting boss (not shown) in which a screw hole is formed is provided above the vicinity of the left side wall 33 of the rear side wall 31 in the cylinder head 11. As described above, the fuel pump mounting bracket 15 is fixed to the cylinder head 11 by coupling the bolt 16 to the screw hole.
　図１および図３に示すように、前側壁部３２には、図示しない各排気ポートと接続される排気マニホールド２５が取り付けられている。各排気ポートは、各燃焼室から排気される。各排気ポートを流通した排気ガスは、下流側の図示しない排気ガス浄化装置に流通する。 As shown in FIGS. 1 and 3, an exhaust manifold 25 connected to each exhaust port (not shown) is attached to the front side wall portion 32. Each exhaust port is exhausted from each combustion chamber. The exhaust gas flowing through each exhaust port flows to an exhaust gas purification device (not shown) on the downstream side.
　図１および図３に示すように、左側壁部３３には、バキュームポンプ２３が取り付けられる。図４に示すように、左側壁部３３の上部における車両前後方向の中央部には、ねじ孔が形成された取付ボス３３ａが設けられている。 1 and 3, a vacuum pump 23 is attached to the left wall 33. As shown in FIG. 4, a mounting boss 33 a formed with a screw hole is provided at the center in the vehicle front-rear direction at the upper portion of the left side wall portion 33.
　図４に示すように、後側壁部３１、前側壁部３２および左側壁部３３の各上方には、ねじ孔が形成された複数の取付ボス３１ａ、３２ａおよび３３ａが設けられている。図１に示すように、シリンダヘッドカバー１７は、取付孔にそれぞれボルト３６が挿通されている。そして、ボルト３６は、対応する箇所の取付ボス３１ａ、３２ａおよび３３ａのいずれかのねじ孔にねじ込まれてシリンダヘッドカバー１７がシリンダヘッド１１に固定される。 As shown in FIG. 4, a plurality of mounting bosses 31 a, 32 a, and 33 a formed with screw holes are provided above the rear side wall portion 31, the front side wall portion 32, and the left side wall portion 33. As shown in FIG. 1, the cylinder head cover 17 has bolts 36 inserted through the mounting holes. Then, the bolt 36 is screwed into any one of the mounting bosses 31 a, 32 a, and 33 a at the corresponding location, and the cylinder head cover 17 is fixed to the cylinder head 11.
　図３において、上方開口部３５の中央部分には、吸気カムシャフト１２を図示しないカムベアリングを介して回転自在に支持する複数のベアリング支持部３５ａと、排気カムシャフト１３を図示しないカムベアリングを介して回転自在に支持する複数のベアリング支持部３５ｂとが設けられている。各ベアリング支持部３５ａ、３５ｂを挟んで前側および後側には、一対のねじ孔がそれぞれ形成されており、このねじ孔を介してボルト３７がシリンダヘッド１１の上面に結合されることで、各ベアリング支持部３５ａ，３５ｂはシリンダヘッド１１に固定されている。 In FIG. 3, a central portion of the upper opening 35 has a plurality of bearing support portions 35a for rotatably supporting the intake camshaft 12 via a cam bearing (not shown) and an exhaust camshaft 13 via a cam bearing (not shown). And a plurality of bearing support portions 35b that are rotatably supported. A pair of screw holes are respectively formed on the front side and the rear side across the bearing support portions 35a and 35b, and the bolts 37 are coupled to the upper surface of the cylinder head 11 through the screw holes. The bearing support portions 35 a and 35 b are fixed to the cylinder head 11.
　図４、図５に示すように、吸気カムシャフト１２は、シリンダヘッド１１の上方開口部３５の後側で後側壁部３１に並行するように配置される。吸気カムシャフト１２は、シャフト１２ａと、吸気バルブを開閉させるよう各気筒に対応して設けられた複数のカム１２ｂと、燃料ポンプ１４を駆動させるポンプ駆動カム１２ｃと、バキュームポンプ２３を駆動するように軸線方向（本実施形態では、車両左右方向）の左側部分に形成された駆動部１２ｄとを有している。 4 and 5, the intake camshaft 12 is disposed on the rear side of the upper opening 35 of the cylinder head 11 so as to be parallel to the rear side wall portion 31. The intake camshaft 12 drives the shaft 12a, a plurality of cams 12b provided corresponding to each cylinder so as to open and close the intake valve, a pump drive cam 12c for driving the fuel pump 14, and a vacuum pump 23. And a drive portion 12d formed on the left side in the axial direction (the vehicle left-right direction in the present embodiment).
　吸気カムシャフト１２は、シリンダヘッド１１の上方開口部３５のベアリング支持部３５ａに対応して各カムベアリングを固定する複数のカムキャップ１２ｅと、各カムキャップ１２ｅを各ベアリング支持部３５ａのねじ孔に固定する複数のボルト１２ｆと、吸気カムシャフト１２の回転動力が入力される図示しない吸気カムスプロケットとを有している。 The intake camshaft 12 has a plurality of cam caps 12e for fixing the cam bearings corresponding to the bearing support portions 35a of the upper opening 35 of the cylinder head 11, and the cam caps 12e as screw holes of the bearing support portions 35a. A plurality of bolts 12f to be fixed and an intake cam sprocket (not shown) to which the rotational power of the intake camshaft 12 is input.
　図４、図５に示すように、排気カムシャフト１３は、シリンダヘッド１１の上方開口部３５の前側で前側壁部３２に並行するように配置されている。この排気カムシャフト１３は、吸気カムシャフト１２と同様、シャフト１３ａと、排気バルブを開閉させるよう各気筒に対応して設けられた複数のカム１３ｂとを有している。 4 and 5, the exhaust camshaft 13 is disposed in parallel with the front side wall portion 32 on the front side of the upper opening 35 of the cylinder head 11. Similar to the intake camshaft 12, the exhaust camshaft 13 has a shaft 13a and a plurality of cams 13b provided corresponding to each cylinder so as to open and close the exhaust valve.
　排気カムシャフト１３は、シリンダヘッド１１の上方開口部３５のベアリング支持部３５ｂに対応して各カムベアリングを固定する複数のカムキャップ１３ｃと、各カムキャップ１３ｃを各ベアリング支持部３５ｂのねじ孔に固定する複数のボルト１３ｄと、排気カムシャフト１３の回転動力が入力される図示しない排気カムスプロケットとを有している。 The exhaust camshaft 13 has a plurality of cam caps 13c for fixing the cam bearings corresponding to the bearing support portions 35b of the upper opening 35 of the cylinder head 11, and the cam caps 13c as screw holes of the bearing support portions 35b. A plurality of bolts 13d to be fixed and an exhaust cam sprocket (not shown) to which the rotational power of the exhaust camshaft 13 is input.
　図示しない吸気カムスプロケット、排気カムスプロケットおよびクランクシャフトに設けられた図示しないタイミングスプロケットには、図示しないタイミングチェーンが巻き掛けられている。したがって、クランクシャフトの回転動力がタイミングチェーンを介して吸気カムシャフト１２および排気カムシャフト１３に伝達される。 A timing chain (not shown) is wound around a timing sprocket (not shown) provided on an intake cam sprocket, an exhaust cam sprocket and a crankshaft (not shown). Accordingly, the rotational power of the crankshaft is transmitted to the intake camshaft 12 and the exhaust camshaft 13 via the timing chain.
　図１、図５に示すように、燃料ポンプ１４は、ポンプ本体４１を有している。図５に示すように、ポンプ本体４１内には、プランジャ４２と、電磁バルブ４３と、が設けられている。燃料ポンプ１４の下方には、プランジャ４２を付勢するスプリング４４が設けられている。図１および図４に示すように、ポンプ本体４１には、コネクタ４５が設けられている。このコネクタ４５は、図示しないコントローラに電気的に接続される。燃料ポンプ１４は、図示しないチェックバルブとを有している。 1 and 5, the fuel pump 14 has a pump body 41. As shown in FIG. 5, a plunger 42 and an electromagnetic valve 43 are provided in the pump main body 41. A spring 44 that biases the plunger 42 is provided below the fuel pump 14. As shown in FIGS. 1 and 4, the pump body 41 is provided with a connector 45. The connector 45 is electrically connected to a controller (not shown). The fuel pump 14 has a check valve (not shown).
　図５に示すように、ポンプ本体４１は、燃料を吸入する吸入ポート４１ａと、燃料を吐出する吐出ポート４１ｂと、吸入ポート４１ａおよび吐出ポート４１ｂに連通する圧力室４１ｃと、電磁バルブ４３により吸入ポート４１ａを開閉するシート部４１ｄとを有している。ポンプ本体４１は、プランジャ４２を摺動自在に収容するシリンダ４１ｅと、ポンプ本体４１を燃料ポンプ取付ブラケット１５に取り付けるフランジ４１ｆとを有している。 As shown in FIG. 5, the pump body 41 is sucked by an intake port 41a for sucking fuel, a discharge port 41b for discharging fuel, a pressure chamber 41c communicating with the suction port 41a and the discharge port 41b, and an electromagnetic valve 43. And a seat portion 41d for opening and closing the port 41a. The pump body 41 includes a cylinder 41e that slidably accommodates the plunger 42, and a flange 41f that attaches the pump body 41 to the fuel pump mounting bracket 15.
　図５に示すように、吸入ポート４１ａは、低圧燃料供給パイプ１９と接続されている。、吐出ポート４１ｂは、燃料供給パイプ２１と接続されている。吐出ポート４１ｂには、図示しないチェックバルブが設けられており、圧力室４１ｃ内の燃料の圧力が所定値を超えると開弁し、吐出ポート４１ｂから燃料供給パイプ２１内に燃料が吐出される。 As shown in FIG. 5, the suction port 41 a is connected to the low-pressure fuel supply pipe 19. The discharge port 41b is connected to the fuel supply pipe 21. The discharge port 41b is provided with a check valve (not shown). When the fuel pressure in the pressure chamber 41c exceeds a predetermined value, the valve is opened, and fuel is discharged from the discharge port 41b into the fuel supply pipe 21.
　図５に示すように、プランジャ４２は、ポンプ駆動カム１２ｃに当接するローラ４２ａと、ローラ４２ａを回転自在に支持するリフタ部材４２ｂとを有している。リフタ部材４２ｂは、スプリング４４によりポンプ駆動カム１２ｃ側に押圧されており、ローラ４２ａは所定の押圧力でポンプ駆動カム１２ｃに当接している。このプランジャ４２は、ポンプ駆動カム１２ｃの回転運動によって往復運動する。 As shown in FIG. 5, the plunger 42 has a roller 42a that contacts the pump drive cam 12c, and a lifter member 42b that rotatably supports the roller 42a. The lifter member 42b is pressed toward the pump drive cam 12c by a spring 44, and the roller 42a is in contact with the pump drive cam 12c with a predetermined pressing force. The plunger 42 reciprocates by the rotational movement of the pump drive cam 12c.
　この燃料ポンプ１４は、ポンプ駆動カム１２ｃの回転により、プランジャ４２が下降すると吸入ポート４１ａが開き、容積が大きくなる圧力室４１ｃ内に燃料が吸入され、ポンプ駆動カム１２ｃの回転により、プランジャ４２が上昇すると、吸入ポート４１ａが閉じられ圧力室４１ｃ内に吸入された燃料の圧力が高められる。 In the fuel pump 14, when the plunger 42 is lowered by the rotation of the pump drive cam 12c, the suction port 41a is opened, and the fuel is sucked into the pressure chamber 41c whose volume is increased, and the plunger 42 is moved by the rotation of the pump drive cam 12c. When it rises, the suction port 41a is closed, and the pressure of the fuel sucked into the pressure chamber 41c is increased.
　電磁バルブ４３は、コントローラにより制御されるソレノイドを有しており、吸入ポート４１ａから燃料を吸入する際にシート部４１ｄを開き、燃料の圧力を高める際にシート部４１ｄを閉じる。 The electromagnetic valve 43 has a solenoid controlled by a controller, and opens the seat portion 41d when sucking fuel from the suction port 41a, and closes the seat portion 41d when increasing the fuel pressure.
　図６、図７に示すように、燃料ポンプ取付ブラケット１５は、吸気カムシャフト１２の軸線方向（本実施形態では、車両左右方向）に延在する第１側壁部５１と、吸気カムシャフト１２の軸線方向（本実施形態では、車両左右方向）に対して略直角をなす方向に延在する第２側壁部５２と、これら第１側壁部５１と第２側壁部５２を一体的に連結する連結壁部５３と、燃料ポンプ取付ボス部５４と、締結部５５とを有しており、各部が一体的に形成されている。なお、本実施形態では、第２側壁部５２が吸気カムシャフト１２の軸方向に対して略直角をなす方向に延在する場合について説明したが、本発明は、第２側壁部５２が吸気カムシャフト１２の軸方向に対して直角をなさずに、この軸方向に交わる方向に延在されている場合も適用される。 As shown in FIGS. 6 and 7, the fuel pump mounting bracket 15 includes a first side wall 51 extending in the axial direction of the intake camshaft 12 (the vehicle left-right direction in this embodiment), and the intake camshaft 12. A second side wall 52 extending in a direction substantially perpendicular to the axial direction (the vehicle left-right direction in the present embodiment), and a connection for integrally connecting the first side wall 51 and the second side wall 52. It has the wall part 53, the fuel pump attachment boss | hub part 54, and the fastening part 55, and each part is integrally formed. In the present embodiment, the case where the second side wall portion 52 extends in a direction substantially perpendicular to the axial direction of the intake camshaft 12 has been described. However, in the present invention, the second side wall portion 52 has the intake cam. The present invention can also be applied to a case where the shaft 12 extends in a direction intersecting with the axial direction without making a right angle to the axial direction of the shaft 12.
　図７に、第１側壁部５１の底面５１ａを示す。この底面５１ａは、図４に示すシリンダヘッド１１の後側壁部３１の上面３１ｂに当接する。図６および図７に示すように、第１側壁部５１の底面５１ａと反対側に、上面５１ｂが形成されている。第１側壁部５１には、シリンダヘッド１１の上方開口部３５側の上面３１ｂに固定する固定ボス５１ｃとを有している。固定ボス５１ｃには、上面５１ｂと底面５１ａとを貫通する貫通孔５１ｄが形成されている。この貫通孔５１ｄには、図３および図４に示すように、ボルト１６が挿通される。 FIG. 7 shows a bottom surface 51a of the first side wall 51. FIG. The bottom surface 51a contacts the upper surface 31b of the rear side wall 31 of the cylinder head 11 shown in FIG. As shown in FIGS. 6 and 7, an upper surface 51 b is formed on the side opposite to the bottom surface 51 a of the first side wall portion 51. The first side wall 51 has a fixed boss 51 c that is fixed to the upper surface 31 b of the cylinder head 11 on the upper opening 35 side. The fixed boss 51c is formed with a through hole 51d that penetrates the upper surface 51b and the bottom surface 51a. As shown in FIGS. 3 and 4, the bolt 16 is inserted into the through hole 51 d.
　図７に、第２側壁部５２の底面５２ａを示す。この底面５２ａは、図４に示すシリンダヘッド１１の左側壁部３３の上面３３ｂに当接する。第２側壁部５２の底面５２ａと反対側に、上面５２ｂが形成されている。図６に示すように、第２側壁部５２は、固定ボス部５２ｃ、５２ｄとを有している。これら固定ボス部５２ｃ、５２ｄは、シリンダヘッド１１の上方開口部３５側の上面３３ｂに固定する固定ボス部５２ｃには、上面５２ｂと底面５２ａとを貫通する締結孔としての貫通孔５２ｇが形成されている。固定ボス部５２ｄには、上面５２ｂと底面５２ａとを貫通する締結孔としての貫通孔５２ｉが形成されている。これら貫通孔５２ｇ、５２ｉにはそれぞれボルト１６が挿通されて、図１に示すように、燃料ポンプ取付ブラケット１５がシリンダヘッド１１側に固定されている。 FIG. 7 shows the bottom surface 52a of the second side wall 52. FIG. The bottom surface 52a contacts the upper surface 33b of the left side wall 33 of the cylinder head 11 shown in FIG. An upper surface 52 b is formed on the side opposite to the bottom surface 52 a of the second side wall portion 52. As shown in FIG. 6, the second side wall portion 52 has fixed boss portions 52c and 52d. These fixed bosses 52c and 52d are formed with through holes 52g as fastening holes that penetrate the upper surface 52b and the bottom surface 52a in the fixed boss portion 52c that is fixed to the upper surface 33b on the upper opening 35 side of the cylinder head 11. ing. The fixed boss portion 52d is formed with a through hole 52i as a fastening hole that penetrates the upper surface 52b and the bottom surface 52a. Bolts 16 are respectively inserted into the through holes 52g and 52i, and the fuel pump mounting bracket 15 is fixed to the cylinder head 11 side as shown in FIG.
　図６に示すように、第２側壁部５２は、吸気カムシャフト１２の軸受を上方から支持するよう、底面５２ａから半円状に凹んで形成された、吸気カムシャフト１２を上方から回転可能に支持する軸受支持部５２ｈを有している。本実施形態の固定ボス５２ｃ、５２ｄの各貫通孔５２ｇ、５２ｉは、吸気カムシャフト１２の軸線と直交する方向で軸受支持部５２ｈを挟むようにこの軸受支持部５２ｈの両側にそれぞれ形成されている。これら貫通孔５２ｇ、５２ｉは、本発明の締結孔を構成している。 As shown in FIG. 6, the second side wall 52 is formed to be recessed from the bottom surface 52 a in a semicircular shape so as to support the bearing of the intake camshaft 12 from above, so that the intake camshaft 12 can be rotated from above. It has a bearing support portion 52h for supporting. The through holes 52g and 52i of the fixed bosses 52c and 52d of the present embodiment are respectively formed on both sides of the bearing support portion 52h so as to sandwich the bearing support portion 52h in a direction orthogonal to the axis of the intake camshaft 12. . These through holes 52g and 52i constitute the fastening holes of the present invention.
　図６および図７に示すように、連結壁部５３は、第１側壁部５１の上面５１ｂ近傍と第２側壁部５２の上面５２ｂ近傍とを連結しており、所定の厚みを有する板状体で構成されている。図６に示すように、この連結壁部５３は、上面側が平坦に形成されている。この連結壁部５３は、シリンダヘッドカバー１７とシリンダヘッド１１とをシールする図示しないシール部材を取り付けるシール部材取付面５３ａを有している。 As shown in FIGS. 6 and 7, the connecting wall 53 connects the vicinity of the upper surface 51b of the first side wall 51 and the vicinity of the upper surface 52b of the second side wall 52, and has a plate-like body having a predetermined thickness. It consists of As shown in FIG. 6, the connecting wall portion 53 is formed flat on the upper surface side. The connecting wall portion 53 has a seal member attachment surface 53 a for attaching a seal member (not shown) that seals the cylinder head cover 17 and the cylinder head 11.
　図６および図７に示すように、この連結壁部５３は、第１側壁部５１の上面５１ｂ近傍と第２側壁部５２の上面５２ｂ近傍とが交わる交点をＰ１とし、連結壁部５３の右端部分と第１側壁部５１の上面５１ｂ近傍とが連結される第１連結点をＰ２とし、連結壁部５３の左端部分と第２側壁部５２の上面５２ｂ近傍とが連結される第２連結点をＰ３として、Ｐ１、Ｐ２、Ｐ３の各点を直線で結ぶと、Ｐ１、Ｐ２、Ｐ３により三角形が形成される。 As shown in FIGS. 6 and 7, the connecting wall portion 53 has an intersection point where the vicinity of the upper surface 51 b of the first side wall portion 51 and the vicinity of the upper surface 52 b of the second side wall portion 52 are defined as P1, and the right end of the connecting wall portion 53. The first connection point where the portion and the vicinity of the upper surface 51b of the first side wall 51 are connected is P2, and the second connection point where the left end portion of the connection wall 53 and the vicinity of the upper surface 52b of the second side wall 52 are connected. Is P3, and points P1, P2, and P3 are connected by straight lines, a triangle is formed by P1, P2, and P3.
　燃料ポンプ取付ボス部５４は、本体５４ａと、燃料ポンプ１４を固定するフランジ５４ｂとを有している。図７に示すように、本体５４ａには、吸気カムシャフト１２に向かって開口し、燃料ポンプ１４を取り付ける取付穴５４ｃが形成されている。 The fuel pump mounting boss portion 54 has a main body 54 a and a flange 54 b for fixing the fuel pump 14. As shown in FIG. 7, the main body 54a is formed with an attachment hole 54c that opens toward the intake camshaft 12 and attaches the fuel pump 14.
　本体５４ａは、第１側壁部５１の前側部分、すなわち内側部分と一体的に設けられ、第２側壁部５２の右側部分、すなわち内側部分と一体的に設けられ、連結壁部５３の交点Ｐ１近傍の部分と一体的に設けられている。本体５４ａの取付穴５４ｃを囲む壁部分の厚みは、第１側壁部５１や第２側壁部５２の厚みよりも厚く形成される。 The main body 54 a is provided integrally with the front side portion of the first side wall portion 51, that is, the inner portion, and is provided integrally with the right side portion of the second side wall portion 52, that is, the inner portion, and in the vicinity of the intersection P 1 of the connecting wall portion 53. It is provided integrally with the part. The wall portion surrounding the attachment hole 54c of the main body 54a is formed to be thicker than the first sidewall portion 51 and the second sidewall portion 52.
　図６に示すように、フランジ５４ｂは、本体５４ａの開口とは反対側（車両前後方向後側）に向けて吸気カムシャフト１２と離隔する側に突出するように形成されている。図４に示すように、このフランジ５４ｂは、平坦な取付面と一対のねじ孔を有している。フランジ５４ｂの取付面に、燃料ポンプ１４が当接し、ボルトがねじ孔にねじ込まれて燃料ポンプ１４が燃料ポンプ取付ブラケット１５に固定される。 As shown in FIG. 6, the flange 54b is formed so as to protrude toward the side away from the intake camshaft 12 toward the side opposite to the opening of the main body 54a (the rear side in the vehicle longitudinal direction). As shown in FIG. 4, the flange 54b has a flat mounting surface and a pair of screw holes. The fuel pump 14 comes into contact with the mounting surface of the flange 54b, and a bolt is screwed into the screw hole to fix the fuel pump 14 to the fuel pump mounting bracket 15.
　図６に示すように、締結部５５は、連結壁部５３の上面部分よりもさらに上方に突出して形成された突起５５ａと、バキュームポンプ２３を締結するよう平坦に形成された平坦面５５ｂとを有している。図６および図７に示すように、突起５５ａには左右方向に形成されたねじ孔５５ｃが設けられている。図４に示すように、このねじ孔５５ｃにボルト６０がねじ込まれて燃料ポンプ取付ブラケット１５に固定される。 As shown in FIG. 6, the fastening portion 55 includes a protrusion 55 a formed so as to protrude further upward than the upper surface portion of the connection wall portion 53, and a flat surface 55 b formed flat so as to fasten the vacuum pump 23. Have. As shown in FIGS. 6 and 7, the protrusion 55a is provided with a screw hole 55c formed in the left-right direction. As shown in FIG. 4, a bolt 60 is screwed into the screw hole 55 c and fixed to the fuel pump mounting bracket 15.
　図１に示すように、シリンダヘッドカバー１７は、シリンダヘッド１１の上方開口部３５（図３および図４を参照）を覆う。シリンダヘッドカバー１７は、上方開口部３５に取り付ける複数のヘッド取付部１７ａと、燃料ポンプ取付ブラケット１５に取り付けるブラケット取付部１７ｂとを有している。 As shown in FIG. 1, the cylinder head cover 17 covers the upper opening 35 (see FIGS. 3 and 4) of the cylinder head 11. The cylinder head cover 17 has a plurality of head attachment portions 17 a attached to the upper opening 35 and a bracket attachment portion 17 b attached to the fuel pump attachment bracket 15.
　ヘッド取付部１７ａには、シリンダヘッド１１の後側壁部３１、前側壁部３２および左側壁部３３の取付ボス３１ａ、３２ａおよび３３ａに対応して形成された複数のボルト貫通孔を有している。また、ブラケット取付部１７ｂには、燃料ポンプ取付ブラケット１５のねじ孔６１に対応して形成されたボルト貫通孔を有している。各ボルト貫通孔に、ボルトが挿通されシリンダヘッドカバー１７がシリンダヘッド１１に固定される。 The head mounting portion 17a has a plurality of bolt through holes formed corresponding to the mounting bosses 31a, 32a and 33a 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. . Further, the bracket mounting portion 17b has bolt through holes formed corresponding to the screw holes 61 of the fuel pump mounting bracket 15. Bolts are inserted into the respective bolt through holes, and the cylinder head cover 17 is fixed to the cylinder head 11.
　図５に示すように、低圧燃料供給パイプ１９は、車両に搭載された図示しない燃料タンク内の燃料をフィードポンプによって燃料ポンプ１４の吸入ポート４１ａに供給するようフィードポンプと吸入ポート４１ａとを接続している。 As shown in FIG. 5, the low-pressure fuel supply pipe 19 connects the feed pump and the suction port 41a so that fuel in a fuel tank (not shown) mounted on the vehicle is supplied to the suction port 41a of the fuel pump 14 by the feed pump. is doing.
　図１に示すように、燃料供給パイプ２１は、燃料ポンプ１４の吐出ポート４１ｂとデリバリパイプ２２とを接続しており、燃料ポンプ１４の圧力室４１ｃで圧力が高められた燃料をデリバリパイプ２２に供給する。 As shown in FIG. 1, the fuel supply pipe 21 connects the discharge port 41 b of the fuel pump 14 and the delivery pipe 22, and the fuel whose pressure is increased in the pressure chamber 41 c of the fuel pump 14 is supplied to the delivery pipe 22. Supply.
　このデリバリパイプ２２は、燃料を図示しない各気筒の燃焼室内に噴射する複数のインジェクタに接続されている。このデリバリパイプ２２には、燃料の連続噴射を可能とするため、燃料圧力を基準値に保つことができるよう、燃料圧力センサーやリリーフバルブが設けられている。 The delivery pipe 22 is connected to a plurality of injectors that inject fuel into the combustion chambers of the respective cylinders (not shown). The delivery pipe 22 is provided with a fuel pressure sensor and a relief valve so that the fuel pressure can be maintained at a reference value in order to enable continuous fuel injection.
　図４および図５に示すように、バキュームポンプ２３は、吸気カムシャフト１２の駆動部１２ｄに連結され、吸気カムシャフト１２により駆動される。バキュームポンプ２３は、ポンプ本体２３ａと、シリンダヘッド１１の左側壁部３３および燃料ポンプ取付ブラケット１５に連結する連結ハウジング２３ｂとを有している。このバキュームポンプ２３は、負圧を発生させ、ブレーキブースタなどの負圧の必要な要素に負圧を供給する。 4 and 5, the vacuum pump 23 is connected to the drive portion 12d of the intake camshaft 12 and is driven by the intake camshaft 12. The vacuum pump 23 has a pump body 23 a and a connecting housing 23 b that is connected to the left side wall 33 of the cylinder head 11 and the fuel pump mounting bracket 15. The vacuum pump 23 generates a negative pressure and supplies the negative pressure to an element requiring a negative pressure such as a brake booster.
　図１および図２に示す吸気マニホールド２４は、シリンダヘッド１１の後側壁部３１に連結する図示しないフランジと、各吸気ポートに接続され吸気ポートに空気を導入させる多岐管と、多岐管を集合させ上流側の吸気管に接続する集合管を有している。 The intake manifold 24 shown in FIG. 1 and FIG. 2 collects a flange (not shown) connected to the rear side wall portion 31 of the cylinder head 11, a manifold connected to each intake port and introducing air into the intake port, and the manifolds. A collecting pipe connected to the upstream intake pipe is provided.
　図１に示す排気マニホールド２５は、シリンダヘッド１１の前側壁部３２に連結する図示しないフランジと、各排気ポートに接続され排気ポートから排気される排気ガスを通す多岐管と、多岐管を集合させ下流側の排気管や排気ガス浄化装置に接続する集合管を有している。 The exhaust manifold 25 shown in FIG. 1 collects a manifold (not shown) connected to the front side wall portion 32 of the cylinder head 11, a manifold through which exhaust gas is connected to each exhaust port and exhausted from the exhaust port, and the manifold. It has a collecting pipe connected to a downstream exhaust pipe and an exhaust gas purification device.
　次に、本実施形態に係る燃料ポンプの取付構造における燃料ポンプ１４の動作について簡単に説明する。
　エンジン１が始動すると、図示しないクランクシャフトの回転により図示しないタイミングスプロケット、タイミングチェーンを介して図示しない吸気スプロケットおよび排気スプロケットが回転する。これらの回転に伴って吸気カムシャフト１２および排気カムシャフト１３が回転する。図４および図５に示すように、吸気カムシャフト１２が回転すると、ポンプ駆動カム１２ｃが回転する。図５に示すように、ポンプ駆動カム１２ｃが回転すると、燃料ポンプ１４のプランジャ４２が圧力室４１ｃ内を往復摺動する。 Next, the operation of the fuel pump 14 in the fuel pump mounting structure according to the present embodiment will be briefly described.
When the engine 1 is started, an intake sprocket (not shown) and an exhaust sprocket (not shown) are rotated via a timing sprocket (not shown) and a timing chain by rotation of a crankshaft (not shown). With these rotations, the intake camshaft 12 and the exhaust camshaft 13 rotate. As shown in FIGS. 4 and 5, when the intake camshaft 12 rotates, the pump drive cam 12c rotates. As shown in FIG. 5, when the pump drive cam 12c rotates, the plunger 42 of the fuel pump 14 reciprocates in the pressure chamber 41c.
　図５に示すように、プランジャ４２がポンプ駆動カム１２ｃの方向に摺動すると吸入ポート４１ａが開き、燃料が圧力室４１ｃ内に吸入され、ロッド４２ｃが圧力室４１ｃの方向に摺動すると吸入ポート４１ａが閉じられ圧力室４１ｃ内に吸入された燃料の圧力が高められる。圧力室４１ｃ内の燃圧が所定値を超えると吐出ポート４１ｂから燃料が吐出され、燃料供給パイプ２１をとおってデリバリパイプ２２に供給される。そして、デリバリパイプ２２から各インジェクションに燃料が供給され適合するタイミングで燃焼室内に噴射される。 As shown in FIG. 5, when the plunger 42 slides in the direction of the pump drive cam 12c, the suction port 41a opens, fuel is sucked into the pressure chamber 41c, and when the rod 42c slides in the direction of the pressure chamber 41c, the suction port 41a is closed and the pressure of the fuel sucked into the pressure chamber 41c is increased. When the fuel pressure in the pressure chamber 41 c exceeds a predetermined value, fuel is discharged from the discharge port 41 b and supplied to the delivery pipe 22 through the fuel supply pipe 21. Then, fuel is supplied from the delivery pipe 22 to each injection and injected into the combustion chamber at a suitable timing.
　以上の構成を有する本実施形態の燃料ポンプ１４の取付構造によれば、図７に示すように、燃料ポンプ取付ボス部５４が、燃料ポンプ取付ブラケット１５の第１側壁部５１、第２側壁部５２および連結壁部５３の３つの壁部で支持されるので、従来のものと比較して、重量や製造コストが増加することなく、燃料ポンプ取付ボス部の剛性が高まるという効果が得られる。 According to the fuel pump 14 mounting structure of the present embodiment having the above configuration, as shown in FIG. 7, the fuel pump mounting boss portion 54 includes the first side wall portion 51 and the second side wall portion of the fuel pump mounting bracket 15. Since it is supported by the three wall portions 52 and the connecting wall portion 53, the effect of increasing the rigidity of the fuel pump mounting boss portion can be obtained without increasing the weight and the manufacturing cost as compared with the conventional one.
　その結果、燃料ポンプ１４が吸気カムシャフト１２のポンプ駆動カム１２ｃによって駆動される際に、燃料ポンプ１４やその取付構造を構成する要素の振動が低減され、振動により発生する騒音の問題や、車両の乗り心地の悪化の問題が解消されるという効果が得られる。 As a result, when the fuel pump 14 is driven by the pump drive cam 12c of the intake camshaft 12, the vibration of the fuel pump 14 and the elements constituting the mounting structure is reduced, and the problem of noise generated by the vibration, the vehicle The effect that the problem of deterioration of ride comfort is solved.
　図４および図５に示すように、本実施形態の燃料ポンプ１４の取付構造によれば、燃料ポンプ取付ボス部５４が、シリンダヘッド１１より上方に位置し、吸気カムシャフト１２に向かって開口するので、燃料ポンプ取付ブラケット１５をシリンダヘッド１１の側壁部に設ける必要がなくなる。 As shown in FIGS. 4 and 5, according to the mounting structure of the fuel pump 14 of the present embodiment, the fuel pump mounting boss portion 54 is located above the cylinder head 11 and opens toward the intake camshaft 12. Therefore, it is not necessary to provide the fuel pump mounting bracket 15 on the side wall portion of the cylinder head 11.
　その結果、シリンダヘッド１１の側壁部に燃料ポンプ１４を取り付ける切欠きを形成する必要がなくなり、切欠き部分でシリンダヘッド１１の剛性が低下することがなくなり、側壁部を補強する必要がなくなるという効果が得られる。 As a result, it is not necessary to form a notch for attaching the fuel pump 14 to the side wall portion of the cylinder head 11, the rigidity of the cylinder head 11 is not lowered at the notch portion, and the side wall portion need not be reinforced. Is obtained.
　従来の特許文献１に記載のものには、本実施形態の燃料ポンプ１４の取付構造の燃料ポンプ取付ボス部５４のような取付ボス部が形成されていないので、取付構造の剛性が確保できないという問題があった。しかしながら、本実施形態の燃料ポンプ１４の取付構造によれば、燃料ポンプ取付ボス部５４が設けられるとともに、燃料ポンプ取付ボス部５４の本体５４ａの取付穴５４ｃを囲む壁部分の厚みは、第１側壁部５１や第２側壁部５２の厚みよりも厚く形成され、剛性が高められている。その結果、従来の取付構造の剛性の問題が解消されるという効果が得られる。 Since the mounting boss portion such as the fuel pump mounting boss portion 54 of the mounting structure of the fuel pump 14 of the present embodiment is not formed in the conventional one described in Patent Document 1, the rigidity of the mounting structure cannot be ensured. There was a problem. However, according to the mounting structure of the fuel pump 14 of the present embodiment, the fuel pump mounting boss portion 54 is provided, and the thickness of the wall portion surrounding the mounting hole 54c of the main body 54a of the fuel pump mounting boss portion 54 is the first. It is formed thicker than the thickness of the side wall 51 and the second side wall 52, and the rigidity is increased. As a result, an effect that the problem of rigidity of the conventional mounting structure is solved can be obtained.
　燃料ポンプ取付ボス部５４が、燃料ポンプ取付ブラケット１５の第１側壁部５１、第２側壁部５２および連結壁部５３の３つの壁部で支持されるとともに、シリンダヘッド１１より上方に位置し、吸気カムシャフト１２に向かって開口するので、燃料ポンプ取付ボス部５４をシリンダヘッド１１の上部に配置することが可能となる。その結果、吸気マニホールド２４の配管の設置の自由度が大きくなるという効果が得られる。 The fuel pump mounting boss portion 54 is supported by the three wall portions of the first side wall portion 51, the second side wall portion 52, and the connecting wall portion 53 of the fuel pump mounting bracket 15, and is positioned above the cylinder head 11, Since it opens toward the intake camshaft 12, the fuel pump mounting boss portion 54 can be disposed on the cylinder head 11. As a result, there is an effect that the degree of freedom of installation of the piping of the intake manifold 24 is increased.
　本実施形態の燃料ポンプ１４の取付構造によれば、連結壁部５３より上方に位置し、かつ燃料ポンプ取付ボス部５４の吸気カムシャフト１２から離隔する側に位置する締結部５５で、燃料ポンプ取付ブラケット１５にバキュームポンプ２３が締結される。このため、燃料ポンプ取付ブラケット１５とバキュームポンプ２３とが締結されることにより、取付構造の剛性が高められる。 According to the mounting structure of the fuel pump 14 of the present embodiment, the fuel pump is provided with the fastening portion 55 that is located above the connecting wall portion 53 and that is located on the side away from the intake camshaft 12 of the fuel pump mounting boss portion 54. A vacuum pump 23 is fastened to the mounting bracket 15. For this reason, when the fuel pump mounting bracket 15 and the vacuum pump 23 are fastened, the rigidity of the mounting structure is increased.
　燃料ポンプ取付ブラケット１５とバキュームポンプ２３との締結により、燃料ポンプ取付ボス部５４の吸気カムシャフト１２から離隔する側がシリンダヘッド１１の内側方向に倒れ込むように変形することが抑制されるという効果が得られる。 By fastening the fuel pump mounting bracket 15 and the vacuum pump 23, it is possible to prevent the side of the fuel pump mounting boss portion 54 that is separated from the intake camshaft 12 from being deformed so as to fall inward of the cylinder head 11. It is done.
　図６および図７に示すように、本実施形態の燃料ポンプ１４の取付構造によれば、第２側壁部５２の軸受支持部５２ｈが吸気カムシャフト１２の軸線と直交する方向で軸受支持部５２ｈの両側に貫通孔５２ｇ、５２ｉを有するので、軸受支持部５２ｈが吸気カムシャフト１２を跨いで両側でシリンダヘッド１１と貫通孔５２ｇ、５２ｉを介して締結される。その結果、軸受支持部５２ｈが倒れ込むように変形することが抑制されるという効果が得られる。 As shown in FIGS. 6 and 7, according to the mounting structure of the fuel pump 14 of the present embodiment, the bearing support 52 h in the direction in which the bearing support 52 h of the second side wall 52 is perpendicular to the axis of the intake camshaft 12. Since the through- holes 52g and 52i are provided on both sides, the bearing support portion 52h is fastened to the both sides of the intake camshaft 12 via the cylinder head 11 and the through- holes 52g and 52i. As a result, it is possible to obtain an effect that the bearing support portion 52h is prevented from being deformed so as to fall down.
　本実施形態の燃料ポンプ１４の取付構造によれば、図４に示すように、燃料ポンプ１４が駆動されると、ポンプ駆動カム１２ｃによって燃料ポンプ取付ブラケット１５の第１側壁部５１には、吸気カムシャフト１２から離隔する方向に荷重が加わる。本実施形態の燃料ポンプ１４の取付構造によれば、連結壁部５３が、交点Ｐ１と第１連結点Ｐ２と第２連結点Ｐ３とにより三角形を形成するので（図６および図７を参照）、加わる荷重を第１側壁部５１から第２側壁部５２に効果的に伝えることが可能となり、第１側壁部５１の変形が抑制されるという効果が得られる。 According to the mounting structure of the fuel pump 14 of the present embodiment, as shown in FIG. 4, when the fuel pump 14 is driven, the pump drive cam 12c causes the first side wall 51 of the fuel pump mounting bracket 15 to be inhaled. A load is applied in a direction away from the camshaft 12. According to the mounting structure of the fuel pump 14 of the present embodiment, the connection wall portion 53 forms a triangle by the intersection point P1, the first connection point P2, and the second connection point P3 (see FIGS. 6 and 7). The applied load can be effectively transmitted from the first side wall portion 51 to the second side wall portion 52, and an effect that deformation of the first side wall portion 51 is suppressed is obtained.
　なお、本実施形態の燃料ポンプ１４の取付構造によれば、シール部材を介して連結壁部５３にシリンダヘッドカバー１７の一部を取り付けることができるので、連結壁部５３の剛性が高められ、第２側壁部５２の軸受支持部５２ｈが倒れ込むように変形することが抑制されるという効果が得られる。 In addition, according to the attachment structure of the fuel pump 14 of this embodiment, since a part of cylinder head cover 17 can be attached to the connection wall part 53 via a sealing member, the rigidity of the connection wall part 53 is improved, and the first The effect that it suppresses that the bearing support part 52h of the 2 side wall part 52 falls so that it may fall down is acquired.
　なお、本実施形態における燃料ポンプ１４の取付構造では、燃料ポンプ取付ブラケット１５を単一構造で構成した場合について説明したが、本発明に係る燃料ポンプの取付構造においては、燃料ポンプ取付ブラケットを単一構造以外の構造で構成するようにしてもよい。
　例えば、燃料ポンプ取付ブラケットが、シリンダヘッドの上部に配置されるシリンダヘッドカバーと一体に形成される一体構造で構成するようにしてもよい。 In the fuel pump 14 mounting structure according to the present embodiment, the fuel pump mounting bracket 15 is configured as a single structure. However, in the fuel pump mounting structure according to the present invention, the fuel pump mounting bracket is a single unit. You may make it comprise by structures other than one structure.
For example, the fuel pump mounting bracket may be configured as an integral structure formed integrally with a cylinder head cover disposed on the upper portion of the cylinder head.
　この場合、燃料ポンプ取付ブラケットが、シリンダヘッドの上部に配置されるシリンダヘッドカバーと一体に形成されるので、燃料ポンプ取付ブラケットをシリンダヘッドカバーと別体で設ける必要がなく、部品点数が削減され、製造コストの増大が抑制されるという効果が得られる。 In this case, since the fuel pump mounting bracket is formed integrally with the cylinder head cover arranged on the upper part of the cylinder head, it is not necessary to provide the fuel pump mounting bracket separately from the cylinder head cover, and the number of parts is reduced and the manufacturing is performed. The effect that the increase in cost is suppressed is acquired.
　本発明の実施形態を開示したが、当業者によっては本発明の範囲を逸脱することなく変更が加えられうることは明白である。すべてのこのような修正および等価物が次の請求項に含まれることが意図されている。 Although embodiments of the present 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 present invention. All such modifications and equivalents are intended to be included in the following claims.
　１１　シリンダヘッド
　１２　吸気カムシャフト（カム軸）
　１２ｃ　ポンプ駆動カム
　１３　排気カムシャフト（カム軸）
　１４　燃料ポンプ
　１５　燃料ポンプ取付ブラケット
　１７　シリンダヘッドカバー
　２３　バキュームポンプ
　５１　第１側壁部
　５２　第２側壁部
　５２ｇ，５２ｉ　貫通孔（締結孔）
　５３　連結壁部
　５３ａ　シール部材取付面
　５４　燃料ポンプ取付ボス部
　５５　締結部
　Ｐ１　交点
　Ｐ２　第１連結点
　Ｐ３　第２連結点 11 Cylinder head 12 Intake camshaft (camshaft)
12c Pump drive cam 13 Exhaust cam shaft (cam shaft)
14 Fuel pump 15 Fuel pump mounting bracket 17 Cylinder head cover 23 Vacuum pump 51 First side wall portion 52 Second side wall portion 52g, 52i Through hole (fastening hole)
53 Connecting wall portion 53a Seal member mounting surface 54 Fuel pump mounting boss portion 55 Fastening portion P1 Intersection P2 First connecting point P3 Second connecting point

Claims (7)

  1. 　シリンダヘッドに回転自在に支持されたカム軸のポンプ駆動カムによって駆動される燃料ポンプの取付構造において、
    　前記燃料ポンプを前記シリンダヘッドに取り付ける燃料ポンプ取付ブラケットを備え、
    　前記燃料ポンプ取付ブラケットが、前記カム軸の軸線方向に延在する第１側壁部と、前記カム軸と交わる方向に延在する第２側壁部と、前記第１側壁部と前記第２側壁部とを連結する連結壁部と、前記燃料ポンプを取り付ける燃料ポンプ取付ボス部とを有し、
    　前記燃料ポンプ取付ボス部が、前記第１側壁部、前記第２側壁部および前記連結壁部に支持されることを特徴とする燃料ポンプの取付構造。     In a fuel pump mounting structure driven by a pump drive cam of a camshaft rotatably supported by a cylinder head,
    A fuel pump mounting bracket for mounting the fuel pump to the cylinder head;
    The fuel pump mounting bracket includes a first side wall portion extending in an axial direction of the cam shaft, a second side wall portion extending in a direction crossing the cam shaft, the first side wall portion, and the second side wall portion. A connecting wall portion for connecting the fuel pump, and a fuel pump mounting boss portion for mounting the fuel pump,
    The fuel pump mounting structure, wherein the fuel pump mounting boss is supported by the first side wall, the second side wall, and the connecting wall.
  2. 　前記カム軸は、吸気側のカム軸であり、
    　前記燃料ポンプ取付ボス部が、前記シリンダヘッドより上方に位置するとともに、前記吸気側のカム軸に向かって開口することを特徴とする請求項１に記載の燃料ポンプの取付構造。     The camshaft is an intake-side camshaft,
    2. The fuel pump mounting structure according to claim 1, wherein the fuel pump mounting boss portion is positioned above the cylinder head and opens toward the intake-side camshaft. 3.
  3. 　前記燃料ポンプ取付ブラケットが、前記カム軸により駆動されるバキュームポンプを締結する締結部を有し、前記締結部が、前記連結壁部より上方に位置するとともに、前記燃料ポンプ取付ボス部の前記カム軸から離隔する側に位置することを特徴とする請求項１または請求項２に記載の燃料ポンプの取付構造。 The fuel pump mounting bracket has a fastening portion for fastening a vacuum pump driven by the cam shaft, the fastening portion is located above the connecting wall portion, and the cam of the fuel pump mounting boss portion The fuel pump mounting structure according to claim 1, wherein the fuel pump mounting structure is located on a side away from the shaft.
  4. 　前記第２側壁部が、前記カム軸を上方から回転可能に支持する軸受支持部を有し、前記軸受支持部が前記カム軸の軸線と直交する方向で前記軸受支持部の両側に締結孔を有することを特徴とする請求項２に記載の燃料ポンプの取付構造。 The second side wall portion has a bearing support portion that rotatably supports the cam shaft from above, and the bearing support portion has fastening holes on both sides of the bearing support portion in a direction perpendicular to the axis of the cam shaft. The fuel pump mounting structure according to claim 2, wherein the fuel pump mounting structure is provided.
  5. 　前記連結壁部が、前記第１側壁部と前記第２側壁部とが交わる交点と、前記連結壁部と前記第１側壁部とが連結される第１連結点と、前記連結壁部と前記第２側壁部とが連結される第２連結点とを有し、前記交点と前記第１連結点と前記第２連結点とが三角形を形成することを特徴とする請求項１ないし請求項４のいずれか１項に記載の燃料ポンプの取付構造。 The connection wall portion includes an intersection where the first side wall portion and the second side wall portion intersect, a first connection point where the connection wall portion and the first side wall portion are connected, the connection wall portion, and the 5. The second connecting point to which the second side wall portion is connected, and the intersection, the first connecting point, and the second connecting point form a triangle. The fuel pump mounting structure according to any one of the above.
  6. 　前記連結壁部が、平坦状に形成され、前記シリンダヘッドの上部に配置されるシリンダヘッドカバーと前記シリンダヘッドとをシールするシール部材を取り付けるシール部材取付面を有することを特徴とする請求項１ないし請求項５のいずれか１項に記載の燃料ポンプの取付構造。 The said connection wall part is formed in flat shape, and has the sealing member attachment surface which attaches the sealing member which seals the cylinder head cover arrange | positioned at the upper part of the said cylinder head, and the said cylinder head. The fuel pump mounting structure according to claim 5.
  7. 　前記燃料ポンプ取付ブラケットが、前記シリンダヘッドの上部に配置されるシリンダヘッドカバーと一体に形成されたことを特徴とする請求項１ないし請求項６のいずれか１項に記載の燃料ポンプの取付構造。 The fuel pump mounting structure according to any one of claims 1 to 6, wherein the fuel pump mounting bracket is formed integrally with a cylinder head cover disposed on an upper portion of the cylinder head.
PCT/JP2015/057537 2014-03-31 2015-03-13 Mounting structure for fuel pump WO2015151767A1 (en)

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