JP2012237310A - Fuel pump mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel pump mounting structure capable of securing sufficient sealability of a hole part for mounting a pump of a cylinder head cover.SOLUTION: The mounting structure 1 of a fuel pump to an engine has a first mounting seat (cam cap 4) fixed to the cylinder head 2 of the engine, the second mounting seat (bracket 5) which is fixed to the first mounting seat and to which the fuel pump 7 is secured, and a gasket 6 contacting the peripheral surface of the hole part (hole part 12 for mounting the pump) formed in the cylinder head cover 3 of the engine, the gasket is held between the first mounting seat and the second mounting seat.

Description

  The present invention relates to a fuel pump mounting structure, and more particularly to a fuel pump mounting structure capable of ensuring sufficient sealing performance of a hole of a cylinder head cover.

  As a conventional fuel pump mounting structure, for example, as shown in FIG. 13, there is known a mounting structure 101 in which a fuel pump 107 is mounted on a bracket 105 fixed to an engine cylinder head 102 (for example, Patent Document 1). 1). In this fuel pump mounting structure 101, a gasket 106 is attached to a pump insertion hole 112 formed in the cylinder head cover 103, and the gasket 106 is pressed against the bracket 105 from above to be oil-sealed. Thereby, since the gasket 106 is interposed between the bracket 105 and the cylinder head cover 103, the vibration of the fuel pump 107 is hardly transmitted to the cylinder head cover 103, and the generation of vibration transmission sound can be suppressed.

JP 2000-291503 A

  However, in the technique of Patent Document 1, the gasket 106 is pressed from above the bracket 105 so that the pump insertion hole 112 of the cylinder head cover 103 is oil-sealed. May creep upward. In particular, when the cylinder head cover 103 is made of resin, creep deformation is likely to occur. As a result, the surface pressure of the gasket 106 decreases and it becomes difficult to ensure sufficient sealing performance.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a fuel pump mounting structure capable of ensuring sufficient sealing performance of the hole of the cylinder head cover.

In order to solve the above problem, the invention according to claim 1 is a fuel pump mounting structure for an engine, the first mounting seat fixed to the cylinder head of the engine, and the first mounting seat fixed to the first mounting seat. A second mounting seat to which the fuel pump is mounted, and a gasket that is in contact with a peripheral surface of a hole formed in a cylinder head cover of the engine, wherein the first mounting seat and the second mounting seat The gist is that the gasket is sandwiched between them.
According to a second aspect of the present invention, in the first aspect, the hole of the cylinder head cover is further sandwiched between the first mounting seat and the second mounting seat together with the gasket. The gist.
According to a third aspect of the present invention, in the second aspect, a flange projecting inward is provided in the hole portion of the cylinder head cover, and the gasket is provided so as to contact the front and back surfaces of the flange. The gist is that the flange is sandwiched between the first mounting seat and the second mounting seat via the gasket.
A fourth aspect of the present invention is the bolt according to any one of the first to third aspects, wherein the hole is inserted with a fastening bolt for fastening the first mounting seat and the second mounting seat. The gist is that it is a hole for insertion.
The gist of a fifth aspect of the present invention is that, in any one of the first to third aspects, the hole is a pump insertion hole through which the fuel pump is inserted.

According to the fuel pump mounting structure of the present invention, since the gasket is sandwiched between the first mounting seat and the second mounting seat, the gasket is less susceptible to the creep deformation of the cylinder head cover. Therefore, a decrease in the surface pressure of the gasket is suppressed, and a sufficient sealing performance of the hole of the cylinder head cover can be ensured. In particular, a sufficient sealing performance can be ensured even when a resin cylinder head cover is employed. Further, since the gasket is interposed between the first and second mounting seats and the cylinder head cover, the vibration of the fuel pump is hardly transmitted to the cylinder head cover, and the generation of vibration transmission sound can be suppressed.
In addition, when the hole of the cylinder head cover is further sandwiched between the first mounting seat and the second mounting seat together with the gasket, the cylinder head cover is difficult to be creep-deformed. It can be further increased.
Further, a flange is provided in the hole of the cylinder head cover, the gasket is provided on the flange, and the flange is sandwiched between the first mounting seat and the second mounting seat via the gasket. In this case, the cylinder head cover is hardly creep-deformed and the gasket seals between the first and second mounting seats and the flange, so that the sealing performance can be further improved.
Further, when the hole is a bolt insertion hole through which a fastening bolt for fastening the first mounting seat and the second mounting seat is inserted, a bolt insertion hole formed in the cylinder head cover A gasket that is in contact with the peripheral surface is sandwiched between the first and second mounting seats. As a result, the vibration of the fuel pump is less likely to be transmitted to the cylinder head cover, and the generation of vibration transmission noise can be more reliably suppressed.
Further, when the hole is a pump insertion hole through which the fuel pump is inserted, the gaskets that contact the circumferential surface of the pump insertion hole formed in the cylinder head cover are the first and second mounting seats. Sandwiched between. As a result, the vibration of the fuel pump is less likely to be transmitted to the cylinder head cover, and the generation of vibration transmission noise can be more reliably suppressed.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a perspective view which shows the attachment structure of the fuel pump which concerns on Example 1. FIG. It is a disassembled perspective view of the attachment structure of the said fuel pump. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a principal part enlarged view of FIG. 1 is a longitudinal sectional view showing a gasket according to Example 1. FIG. FIG. 6 is a perspective view with a cross section of a main part of a fuel pump mounting structure according to a second embodiment. It is a disassembled perspective view of the attachment structure of the said fuel pump. It is a longitudinal cross-sectional view of the said fuel pump. It is a principal part enlarged view of FIG. FIG. 5 is an explanatory diagram for explaining a gasket according to a second embodiment, where (a) shows a perspective view of the cylinder head cover with the gasket attached as viewed from the front side, and (b) shows the cylinder head cover with the gasket attached as seen from the back side. FIG. It is a longitudinal cross-sectional view which shows the attachment structure of the fuel pump of another form. It is a longitudinal cross-sectional view which shows the attachment structure of the conventional fuel pump.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

1. Fuel Pump Mounting Structure Embodiment 1 The fuel pump mounting structure according to the present invention is a fuel pump mounting structure (1, 21) for the engine, and includes a first mounting seat (4, 24) fixed to the cylinder head (2) of the engine, and a first mounting. The second mounting seat (5, 25) fixed to the seat and to which the fuel pump (7) is attached, and the peripheral surface of the hole (12, 33) formed in the cylinder head cover (3, 23) of the engine The gasket (6, 19, 26) is provided, and the gasket is sandwiched between the first mounting seat and the second mounting seat (for example, FIG. 3, FIG. 7, and FIG. 12). Etc.). The first mounting seat is normally disposed so as to cover the camshaft (8) of the engine.

  Embodiment 1 As a fuel pump mounting structure according to the present invention, for example, between the first mounting seat (4, 24) and the second mounting seat (5, 25), together with the gasket (6, 26), a cylinder head cover ( 3, 23) (for example, see FIG. 3 and FIG. 7, etc.) in which the hole portions (12, 33) are sandwiched.

  In the case of the above-mentioned form, for example, flanges (12a, 33a) projecting inward are provided in the holes (12, 33) of the cylinder head covers (3, 23), and the flanges are in contact with the front and back surfaces of the flanges. The gasket (6, 26) is provided as described above, and a flange can be sandwiched between the first mounting seat (4, 24) and the second mounting seat (5, 25) via the gasket. . In this case, the gasket (6, 26) is preferably formed in a substantially C-shaped longitudinal section (see, for example, FIGS. 3 and 7).

  Embodiment 1 As the fuel pump mounting structure according to the present invention, for example, the hole is a bolt insertion hole through which a fastening bolt (18a) for fastening the first mounting seat (24) and the second mounting seat (25) is inserted. The form (for example, refer FIG. 7 etc.) which is a part (33) can be mentioned. In this case, for example, the fastening bolt (18a) can be a bolt for fastening the first mounting seat (24), the second mounting seat (25), and the fuel pump (7). Thereby, a number of parts can be reduced and an assembling property is improved.

  In the case of the above-described embodiment, for example, the cylinder head cover (23) is formed with a fuel pump insertion hole (32) through which the fuel pump (7) is inserted, and the gasket (26) is inserted into the bolt (26). A first seal portion (26a) for sealing the passage hole portion, and a second seal portion (26b) connected to the first seal portion and for sealing the pump insertion hole portion (for example, , See FIG. 9 and FIG. Thereby, the vibration of the fuel pump can be further prevented from being transmitted to the cylinder head cover. Further, the number of parts can be further reduced, and the assemblability can be further improved. In this case, for example, the first seal portion (26a) is sandwiched between the first attachment seat (24) and the second attachment seat (25), and the second seal portion (26b) is provided between the first attachment seat and It can be clamped between one of the second mounting seats and the cylinder head cover (23). Thereby, the mounting | wearing property of the gasket with respect to each hole part is improved.

  Embodiment 1 As the fuel pump mounting structure according to the above, for example, the hole may be a pump insertion hole (12) through which the fuel pump (7) is inserted (see, for example, FIG. 3). .

  In the case of the above-described embodiment, for example, a bolt insertion hole through which a fastening bolt (18a) for fastening the first mounting seat (4) and the second mounting seat (5) is inserted into the cylinder head cover (3). A portion (13) is formed, and a gasket (14) for sealing the bolt insertion hole can be further provided (see, for example, FIG. 4). Thereby, the vibration of the fuel pump can be further prevented from being transmitted to the cylinder head cover. In this case, for example, the gasket (14) may be sandwiched between one of the first mounting seat (4) and the second mounting seat (5) and the cylinder head cover (3). it can

  In the case of the above-mentioned form, for example, the first mounting seat (4) has a first tube portion (4b), and the second mounting seat (5) is a second tube fitted into the first tube portion. The gasket (6, 19) has a step portion (16) provided on the distal end side of one of the first tube portion and the second tube portion and the other tube portion. (See, for example, FIGS. 3 and 12). Thereby, the first and second mounting seats, and thus the pump insertion hole, can be reduced in size.

  Embodiment 1 For example, the first mounting seat (4, 24), the second mounting seat (5, 25), and the fuel pump (7) are integrated by bolt fastening. For example, see FIG. 4 and FIG. Thereby, a fuel pump can be attached easily and rapidly.

2. Method of attaching fuel pump Embodiment 2 The mounting method of the fuel pump according to the method includes attaching the gasket (6, 26) to the hole so as to contact the peripheral surface of the hole (12, 33) formed in the cylinder head cover (3, 23); A step of mounting the cylinder head cover with the gasket mounted on the cylinder head (2) to which the first mounting seat (4, 24) is fixed, and a first mounting seat through a hole in the cylinder head cover mounted on the cylinder head. Positioning the second mounting seat with respect to the second mounting seat, attaching the fuel pump (7) to the second mounting seat, and fastening the first mounting seat, the second mounting seat and the fuel pump, which are positioned and positioned, with fastening bolts And a step of sandwiching the gasket between the first mounting seat and the second mounting seat (see, for example, FIGS. 2 and 8). Thereby, while being able to attach a fuel pump with respect to an engine easily and rapidly, the said Embodiment 1. The fuel pump mounting structure can be suitably provided. In the second embodiment. In the fuel pump mounting method of, for example, Embodiment 1 described above. Each of the constituent elements described in the fuel pump mounting structure can be applied.

  Hereinafter, the present invention will be specifically described with reference to the drawings.

<Example 1>
(1) Fuel Pump Mounting Structure A fuel pump mounting structure 1 according to the present embodiment, as shown in FIGS. 1 and 2, is a cylinder head 2 of a direct injection engine (hereinafter simply referred to as “engine”). A metal cam cap 4 (illustrated as a “first mounting seat” according to the present invention) fixed to (see FIG. 3), and an aluminum fixed to the cam cap 4 and to which the fuel pump 7 is mounted. A metal bracket 5 (illustrated as “second mounting seat” according to the present invention) and a pump insertion hole 12 formed in the resin cylinder head cover 3 (“hole” according to the present invention). And a rubber gasket 6 (see FIG. 6) having a substantially C-shaped vertical cross section that press-contacts the peripheral surface of the outer peripheral surface.

  In this embodiment, as the fuel pump 7, as shown in FIGS. 3 and 4, a drive cam 8a provided on the exhaust camshaft 8 of the engine is provided on the distal end side of the plunger that reciprocates in the cylinder 7a. A well-known high-pressure fuel pump provided with a tappet 9 to be pressed is adopted. According to this fuel pump 7, when the exhaust camshaft 8 rotates, the drive cam 8a rotates, so that the plunger reciprocates in the cylinder 7a, and the volume in the cylinder 7a is changed, and oil is fed into the cylinder 7a. The pressurized fuel is pressurized to a high pressure, and the high-pressure fuel is appropriately injected and supplied to the engine according to the valve opening drive of the injector.

  As shown in FIGS. 3 and 4, the cylinder head cover 3 is fixed to the cylinder head 2 so as to cover the top of the cylinder head 2. On the surface side of the cylinder head cover 3, a concave portion 11 recessed inward is formed. The recess 11 has a cylindrical pump insertion hole 12 for mounting the fuel pump 7 and a plurality (two in the figure) of bolt insertion holes arranged on the outer peripheral side of the pump insertion hole 12. 13. As shown in FIG. 5, a cylindrical flange 12 a that protrudes inward (that is, on the spherical center side) is provided on the lower end side of the pump insertion hole 12. The gasket 6 is attached to the flange 12a so as to be in contact with the front and back surfaces (that is, the upper and lower surfaces). A rubber gasket 14 is disposed on the lower end side of each bolt insertion hole 13.

  As shown in FIGS. 3 and 4, the cam cap 4 is disposed so as to cover the exhaust camshaft 8. The cam cap 4 is disposed on the outer peripheral side of the cylindrical portion 4b, a bearing portion 4a that supports the exhaust camshaft 8, a cylindrical cylindrical portion 4b that continues to the upper side of the bearing portion 4a and protrudes upward. A plurality of (two in the figure) attachment portions 4c into which stud bolts 18a (illustrated as “fastening bolts”) are screwed. These mounting portions 4c are arranged at a predetermined pitch interval (for example, an interval of 180 degrees) in the circumferential direction of the cylindrical portion 4b.

  As shown in FIGS. 3 and 4, the bracket 5 includes a cylindrical lower cylindrical portion 5a that is fitted on the inner peripheral side of the cylindrical portion 4b of the cam cap 4, and an axial direction of the lower cylindrical portion 5a. Cylindrical upper cylindrical portion 5b that is continuous with the upper side and has a larger diameter than lower cylindrical portion 5a, and a plurality of (two in the figure) insertions that are arranged on the outer peripheral side of upper cylindrical portion 5b and through which stud bolts 18a are inserted. Part 5c. An outer stepped portion 16 is formed on the outer peripheral side of the connecting portion between the lower cylindrical portion 5a and the upper cylindrical portion 5b. Moreover, each insertion part 5c is arrange | positioned by the predetermined pitch space | interval (for example, 180 degree space | interval etc.) in the circumferential direction of the upper side cylinder part 5b. An inner stepped portion 20 is provided on the lower inner peripheral side of the cylindrical portion 4 b of the cam cap 4 to determine the height position of the bracket 5 by abutting the distal end side of the lower cylindrical portion 5 a of the bracket 5.

  Here, a flange 12a is sandwiched together with the gasket 6 between the distal end side of the cylindrical portion 4b of the cam cap 4 and the outer stepped portion 16 of the bracket 5, and oil leakage from the pump insertion hole 12 is prevented. The Further, a gasket 14 is sandwiched between the mounting portion 4 c of the cam cap 4 and the bolt insertion hole 13 of the cylinder head cover 3, and oil leakage from the bolt insertion hole 13 is prevented.

  The mounting portion 7c of the fuel pump 7 is fixed to the mounting portion 4c of the cam cap 4 by bolt fastening using a stud bolt 18a and a nut 18b that are inserted through the insertion portion 5c of the bracket 5. That is, the fuel pump 7, the cam cap 4, and the bracket 5 are integrated by bolt fastening over these three members. A rubber O-ring 15 is provided on the outer peripheral side of the stepped portion 7 b of the fuel pump 7 so as to be in pressure contact with the inner peripheral surface of the upper cylindrical portion 5 b of the bracket 5.

(2) Method for Attaching Fuel Pump Next, a method for attaching the fuel pump having the above configuration will be described. First, the cam cap 4 is fixed to the cylinder head 2 by bolt fastening or the like, and the gasket 6 is attached to the flange 12 a of the cylinder head cover 3. Next, the cylinder head cover 3 is put on the cylinder head 2 and set. Next, the lower cylinder portion 5a of the bracket 5 is fitted and inserted into the inner peripheral side of the cylinder portion 4b of the cam cap 4 through the pump insertion hole portion 12 of the cylinder head cover 3, and the bolt insertion hole portion of the cylinder head cover 3 is inserted. 13 is inserted into the insertion portion 5c of the bracket 5. At this time, the flange 12a is sandwiched together with the gasket 6 between the distal end side of the cylindrical portion 4b of the cam cap 4 and the outer stepped portion 16 of the bracket 5. Thereafter, the fuel pump 7 is inserted into the upper cylindrical portion 5b of the bracket 5, and the mounting portion 7c of the fuel pump 7 and the mounting portion 4c of the cam cap 4 are connected via the insertion portion 5c of the bracket 5 to the stud bolt 18a and the nut 18b. When the bolt is fastened, the fuel pump 7 is attached to the engine.

(3) Advantages of the Embodiment As described above, according to the fuel pump mounting structure 1 of the present embodiment, the gasket 6 is sandwiched between the cam cap 4 and the bracket 5. Less susceptible to creep deformation. Therefore, a decrease in the surface pressure of the gasket 6 is suppressed, and a sufficient sealing performance of the pump insertion hole 12 of the cylinder head cover 3 can be ensured. In particular, even when the resin cylinder head cover 3 is employed, sufficient sealing performance can be ensured. Further, since the gasket 6 is interposed between each of the cam cap 4 and the bracket 5 and the cylinder head cover 3, the vibration of the fuel pump 7 is difficult to be transmitted to the cylinder head cover 3, and the generation of vibration transmission sound can be suppressed.

  Further, in this embodiment, since the pump insertion hole 12 of the cylinder head cover 3 is further sandwiched between the cam cap 4 and the bracket 5 together with the gasket 6, the cylinder head cover 3 is difficult to be creep-deformed and sealed. The sex can be further enhanced.

  In this embodiment, the flange 12a is provided in the pump insertion hole 12 of the cylinder head cover 3, the gasket 6 is provided in the flange 12a, and the flange 12a is interposed between the cam cap 4 and the bracket 5 via the gasket 6. Is sandwiched between the cam cap 4 and the bracket 5 and the flange 12a, and the sealing performance can be further enhanced.

  In the present embodiment, the cylinder head cover 3 is formed with bolt insertion holes 13 through which fastening bolts 18a for fastening the cam cap 4 and the bracket 5 are inserted. Since the gasket 14 for sealing is further provided, the vibration of the fuel pump 7 can be further prevented from being transmitted to the cylinder head cover 3.

  In this embodiment, the cam cap 4 has a cylindrical portion 4b, the bracket 5 has a lower cylindrical portion 5a that is fitted on the inner peripheral side of the cylindrical portion 4b of the cam cap 4, and the gasket 6 is The cam cap 4 and the bracket 5 and thus the pump insertion hole 12 can be miniaturized because the cam cap 4 and the outer stepped portion 16 provided on the bracket 5 are sandwiched between the distal end side of the cylindrical portion 4b.

  Further, in this embodiment, the cam cap 4, the bracket 5 and the fuel pump 7 are integrated by bolting over three parties, so that the fuel pump 7 can be easily and quickly attached.

  Further, according to the fuel pump mounting method of the present embodiment, the step of attaching the gasket 6 to the pump insertion hole 12 so as to contact the peripheral surface of the pump insertion hole 12 formed in the cylinder head cover 3; A step of attaching the cylinder head cover 3 with the gasket 6 attached to the cylinder head 2 to which the cam cap 4 is fixed, and a pump insertion hole 12 and a bolt insertion hole 13 of the cylinder head cover 3 attached to the cylinder head 2. The bracket 5 is positioned and arranged with respect to the cam cap 4 through the step of attaching the fuel pump 7 to the bracket 5, and the cam cap 4, the bracket 5 and the fuel pump 7 which are positioned and arranged are fastened by the fastening bolts 18a. And sandwiching the gasket 6 between the cam cap 4 and the bracket 5. Runode, with the fuel pump 7 may be mounted easily and quickly to the engine, can be provided suitably a mounting structure 1 of the fuel pump.

<Example 2>
Next, a fuel pump mounting structure according to the second embodiment will be described. Note that, in the fuel pump mounting structure of the second embodiment, the same reference numerals are given to substantially the same components as the fuel pump mounting structure 1 of the first embodiment, and the detailed description thereof will be omitted.

(1) Fuel Pump Mounting Structure A fuel pump mounting structure 21 according to the present embodiment, as shown in FIGS. 7 and 8, is a cylinder head 2 of a direct injection engine (hereinafter simply referred to as “engine”). A plurality of (two in the figure) cam caps 24 (illustrated as “first mounting seats” according to the present invention) made of metal such as aluminum and the like, and the fuel pump 7 fixed to the cam cap 24. A bracket 25 made of metal such as aluminum to be attached (illustrated as a “second attachment seat” according to the present invention), and a bolt insertion hole 33 formed in the cylinder head cover 23 made of resin (“ And a rubber gasket 26 that is in pressure contact with the peripheral surface of the hole.

  The cylinder head cover 23 is fixed to the cylinder head 2 so as to cover the top of the cylinder head 2. The cylinder head cover 23 is provided with a cylindrical pump insertion hole 32 for attaching the fuel pump 7 and a plurality (two in the figure) of bolts arranged on the outer peripheral side of the pump insertion hole 32. A hole 33 is formed (see FIG. 8). As shown in FIG. 10, the bolt insertion hole 33 is provided with a cylindrical flange 33 a that protrudes inwardly (that is, on the spherical center side). As shown in FIGS. 11 (a) and 11 (b), the gasket 26 includes a plurality of (two in the drawing) first seal portions 26a having a substantially C-shaped longitudinal section for sealing the bolt insertion hole 33. The second seal portion 26b is connected to the outside of the first seal portion 26a and has a substantially rectangular longitudinal cross section for sealing a pump insertion hole which will be described later (see FIG. 8). As shown in FIG. 10, the first seal portion 26a of the gasket 26 is attached to the flange 33a of the bolt insertion hole 33 so as to be in contact with the front and back surfaces (that is, the upper and lower surfaces). A second seal portion 26 b of the gasket 26 is disposed on the upper end side of each bolt insertion hole 33.

  The cam cap 24 is disposed so as to cover the exhaust camshaft 8. As shown in FIGS. 9 and 10, the cam cap 24 is connected to a bearing portion 24a for supporting the exhaust camshaft 8 and an upper side of the bearing portion 24a and is connected to a stud bolt 18a (as a “fastening bolt” according to the present invention). And a mounting portion 24b to be screwed. An insertion portion, which will be described later, of the bracket 25 is in contact with the upper end surface of the mounting portion 24b.

  As shown in FIGS. 9 and 10, the bracket 25 includes a cylindrical lower cylindrical portion 25 a through which the fuel pump 7 is inserted, and an axially upper side of the lower cylindrical portion 25 a and a lower cylindrical portion. A cylindrical upper cylindrical portion 25b having a diameter larger than 25a, and a plurality (two in the figure) of insertion portions 25c arranged on the outer peripheral side of the upper cylindrical portion 25b and through which the stud bolts 18a are inserted. Yes. A flange-shaped stepped portion 36 (see FIG. 10) is formed at the connecting portion between the lower cylindrical portion 25a and the upper cylindrical portion 25b. A flange-shaped stepped portion 37 (see FIG. 10) is formed on the outer peripheral side of each insertion portion 25c. Moreover, each insertion part 25c is arrange | positioned by the predetermined pitch space | interval (for example, 180 degree space | interval etc.) in the circumferential direction of the upper side cylinder part 25b.

  Here, a flange 33a is sandwiched between the front end side of the mounting portion 24b of the cam cap 24 and the stepped portion 37 of the bracket 25 together with the first seal portion 26a of the gasket 26, and the flange 33a extends from the bolt insertion hole portion 33. Oil leakage is prevented. The second seal portion 26b of the gasket 26 is sandwiched between the step portion 36 of the bracket 25 and the pump insertion hole 32 of the cylinder head cover 23, and oil leakage from the pump insertion hole 32 is prevented. .

  As shown in FIGS. 9 and 10, the mounting portion 7 c of the fuel pump 7 is fixed to the mounting portion 24 b of the cam cap 24 by bolt fastening using a stud bolt 18 a and a nut 18 b that pass through the insertion portion 25 c of the bracket 25. Has been. That is, the fuel pump 7, the cam cap 24, and the bracket 25 are integrated by bolt fastening over these three members. A rubber O-ring 15 is provided on the outer peripheral side of the stepped portion 7 b of the fuel pump 7 so as to be in pressure contact with the inner peripheral surface of the upper cylindrical portion 25 b of the bracket 25.

(2) Method for Attaching Fuel Pump Next, a method for attaching the fuel pump having the above configuration will be described. First, the cam cap 24 is fixed to the cylinder head 2 by bolt fastening or the like, and the gasket 26 is attached to the pump insertion hole 32 and the bolt insertion hole 33 of the cylinder head cover 23 (FIG. 11A). b)). Next, the cylinder head cover 23 is put on the cylinder head 2 and set. Next, the lower cylinder portion 25 a of the bracket 25 is fitted into the pump insertion hole 32 of the cylinder head cover 23, and the insertion portion 25 c of the bracket 25 is fitted into the bolt insertion hole 33 of the cylinder head cover 23. At this time, as shown in FIG. 10, the flange 33 a is sandwiched together with the first seal portion 26 a of the gasket 26 between the tip end side of the mounting portion 24 b of the cam cap 24 and the stepped portion 37 of the bracket 25, and the bracket 25 The second seal portion 26 b of the gasket 26 is sandwiched between the step portion 36 and the pump insertion hole 32. Thereafter, the fuel pump 7 is inserted into the upper cylindrical portion 25b of the bracket 25, and the mounting portion 7c of the fuel pump 7 and the mounting portion 24b of the cam cap 24 are connected to the stud bolt 18a and the nut 18b via the insertion portion 25c of the bracket 25. When the bolt is fastened, the fuel pump 7 is attached to the engine.

(3) Advantages of the Embodiment As described above, according to the fuel pump mounting structure 21 of the present embodiment, the gasket 26 is sandwiched between the cam cap 24 and the bracket 25, so that the gasket 26 can be attached to the cylinder head cover 23. Less susceptible to creep deformation. Therefore, a decrease in the surface pressure of the gasket 26 is suppressed, and sufficient sealing performance of the bolt insertion hole 33 of the cylinder head cover 23 can be ensured. In particular, even when a resin cylinder head cover 23 is employed, sufficient sealing performance can be ensured. Further, since the gasket 26 is interposed between each of the cam cap 24 and the bracket 25 and the cylinder head cover 23, the vibration of the fuel pump 7 is not easily transmitted to the cylinder head cover 23, and the generation of vibration transmission sound can be suppressed.

  Further, in this embodiment, since the bolt insertion hole 33 of the cylinder head cover 23 is further sandwiched between the cam cap 24 and the bracket 25 together with the gasket 26, the cylinder head cover 23 is difficult to be creep-deformed and sealed. The sex can be further enhanced.

  In this embodiment, a flange 33a is provided in the bolt insertion hole 33 of the cylinder head cover 23, a gasket 26 is provided in the flange 33a, and the flange 33a is interposed between the cam cap 24 and the bracket 25 via the gasket 26. Therefore, the cylinder head cover 23 is more difficult to be creep-deformed, and the gasket 26 seals between the cam cap 24 and the bracket 25 and the flange 33a, thereby further improving the sealing performance.

  Further, in this embodiment, the cylinder head cover 23 is formed with a fuel pump insertion hole 32 through which the fuel pump 7 is inserted, and the gasket 26 is a first for sealing the bolt insertion hole 33. Since the seal portion 26a and the second seal portion 26b for sealing the pump insertion hole 32 are provided outside the first seal portion 26a, the vibration of the fuel pump 7 is not easily transmitted to the cylinder head cover 23. it can. Further, the number of parts can be further reduced, and the assemblability can be further improved.

  Further, in this embodiment, the cam cap 24, the bracket 25, and the fuel pump 7 are integrated by three-way bolt fastening, so that the fuel pump 7 can be easily and quickly attached.

  Further, according to the fuel pump mounting method of the present embodiment, the step of attaching the gasket 26 to the bolt insertion hole 33 so as to contact the peripheral surface of the bolt insertion hole 33 formed in the cylinder head cover 23; A step of attaching the cylinder head cover 23 with the gasket 26 attached to the cylinder head 2 to which the cam cap 24 is fixed, and a pump insertion hole 32 and a bolt insertion hole 33 of the cylinder head cover 23 attached to the cylinder head 2. The bracket 25 is positioned and arranged with respect to the cam cap 24 through the step of attaching the fuel pump 7 to the bracket 25, and the cam cap 24, bracket 25 and fuel pump 7 which are positioned and arranged are fastened by the fastening bolt 18a. Gasket between cam cap 24 and bracket 25 Because comprising a step of clamping the 6, and with the fuel pump 7 may be mounted easily and quickly to the engine, it can be provided suitably a mounting structure 21 of the fuel pump.

  In the present invention, the present invention is not limited to the first and second embodiments, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the first and second embodiments, the flanges 12a and 33a are provided in the holes 12 and 33 of the cylinder head covers 3 and 23, and the flanges 12a and the gaskets 6 and 26 are provided between the cam caps 4 and 24 and the brackets 5 and 25. 33a is not limited to this. For example, as shown in FIG. 7, the flange 12a (33a) is not provided in the hole 12 (33) of the cylinder head cover 3 (23), and the cam cap Only a gasket 19 (for example, a gasket having a substantially rectangular longitudinal section) may be sandwiched between 4 (24) and the bracket 5 (25). In this case, the gasket 19 is compressed and crushed to the outside and pressed against the hole 12 (33) for oil sealing.

  In the first and second embodiments, the embodiment in which the gaskets 6 and 26 are provided so as to be in contact with the front and back surfaces of the flanges 12a and 33a of the cylinder head covers 3 and 23 is illustrated, but the present invention is not limited thereto. , 23 may be provided with a gasket so as to be in contact with one surface (preferably the back surface) of the front and back surfaces of the flanges 12a and 33a.

  In the first and second embodiments, the gap between the fuel pump 7 and the brackets 5 and 25 is sealed with the O-ring 15 attached to the fuel pump 7. However, the present invention is not limited to this. Instead of or in addition to the ring 15, the gap between the fuel pump 7 and the brackets 5, 25 may be surface sealed with a heat insulator having a heat insulating function.

  In the first embodiment, the lower cylindrical portion 5 a of the bracket 5 is fitted and inserted into the inner peripheral side of the cylindrical portion 4 b of the cam cap 4, and the gasket 6 is attached to the distal end side of the cylindrical portion 4 b of the cam cap 4 and the bracket 5. However, the present invention is not limited to this. For example, the lower cylindrical portion of the bracket is fitted into the outer peripheral side of the cylindrical portion of the cam cap, and the gasket is inserted into the bracket. You may make it clamp between the front end side of a lower side cylinder part, and the outer side step part provided in the cam cap.

  In the first and second embodiments, the fuel pump 7 driven by the rotational force of the exhaust camshaft 8 is illustrated. However, the present invention is not limited to this. For example, instead of or in addition to the exhaust camshaft 8, an intake cam It is good also as a fuel pump driven with the rotational force of a shaft. Moreover, in the said Example 1 and 2, although the cam caps 4 and 24 which have the bearing parts 4a and 24a were illustrated as a 1st mounting seat, it is not limited to this, For example, it does not have the bearing parts 4a and 24a. The first mounting seat may be used.

  In the first and second embodiments, the resin cylinder head covers 3 and 23, the metal cam caps 4 and 24, the brackets 5 and 25, and the rubber gaskets 6 and 26 are illustrated. However, the present invention is not limited thereto. Instead, for example, a metal cylinder head cover, a resin cam cap and bracket, or a metal or resin gasket may be used. In the first and second embodiments, the fuel pump 7 is fastened by the stud bolt 18a and the nut 18b. However, the present invention is not limited to this. For example, the fuel pump 7 may be fastened only by the bolt. .

  Further, in the first and second embodiments, the fuel pump mounting structures 1 and 21 for the direct injection engine are illustrated, but the present invention is not limited to this. For example, the fuel for an engine other than the direct injection engine (for example, a diesel engine). A pump mounting structure may be used.

  Moreover, in the said Example 1, although the form which uses the gasket 14 which seals the bolt insertion hole 13 and the gasket 6 which seals the pump insertion hole 12 was illustrated, it is not limited to this, For example, You may employ | adopt the gasket provided with the 1st seal part which seals the bolt insertion hole part 13, and the 2nd seal part which continues to this 1st seal part and seals the pump insertion hole part 12. FIG.

  In the first embodiment, the pump insertion hole 12 is provided with the flange 12a on the front and back surfaces of which the gasket 6 having a substantially C-shaped longitudinal section is in contact. However, the present invention is not limited to this. In addition to or instead of the through-hole portion 12, the bolt insertion hole portion 13 may be provided with a flange that is in contact with a gasket having a substantially C-shaped longitudinal section on the front and back surfaces.

  In the second embodiment, the first seal portion 26a that seals the bolt insertion hole 33 and the second seal portion 26b that is connected to the first seal portion 26a and seals the pump insertion hole 32 are provided. Although the form which uses the gasket 26 was illustrated, it is not limited to this, For example, you may employ | adopt the gasket which seals the hole 33 for bolt insertion, and the gasket which seals the hole 32 for pump insertion.

  Further, in the second embodiment, the bolt insertion hole 33 is provided with the flange 33a in contact with the gasket 26 having a substantially C-shaped longitudinal section on the front and back surfaces. However, the present invention is not limited to this. In addition to or in place of the passage hole 33, the pump insertion hole 32 may be provided with a flange that is in contact with a gasket having a substantially C-shaped longitudinal section on the front and back surfaces.

  Further, in the first and second embodiments, the brackets 5 and 25 are positioned with respect to the cam caps 4 and 24 and then the fuel pump 7 is attached to the brackets 5 and 25. The brackets 5 and 25 to which the fuel pump 7 is attached may be positioned with respect to the cam caps 4 and 24.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  Widely used as a technology for attaching a fuel pump to an engine. In particular, it is suitably used as a mounting structure for a fuel pump driven by the rotational force of a camshaft.

  1, 21; Fuel pump mounting structure, 2; Cylinder head, 3, 23; Cylinder head cover, 4, 24; Cam cap, 5, 25; Bracket, 6, 19, 26; Gasket, 7; Pump insertion hole, 12a; flange, 33; bolt insertion hole, 33a; flange.

Claims (5)

A fuel pump mounting structure for an engine,
A first mounting seat fixed to the cylinder head of the engine;
A second mounting seat fixed to the first mounting seat and to which the fuel pump is mounted;
A gasket that contacts a peripheral surface of a hole formed in a cylinder head cover of the engine,
The fuel pump mounting structure, wherein the gasket is sandwiched between the first mounting seat and the second mounting seat.   The fuel pump mounting structure according to claim 1, wherein the hole of the cylinder head cover is further sandwiched between the first mounting seat and the second mounting seat together with the gasket.   A flange projecting inward is provided in the hole of the cylinder head cover, and the gasket is provided on the flange so as to be in contact with the front and back surfaces of the flange. The first mounting seat, the second mounting seat, The fuel pump mounting structure according to claim 2, wherein the flange is interposed between the flanges via the gasket.   4. The fuel pump according to claim 1, wherein the hole is a bolt insertion hole through which a fastening bolt for fastening the first mounting seat and the second mounting seat is inserted. 5. Mounting structure.   The fuel pump mounting structure according to any one of claims 1 to 3, wherein the hole is a pump insertion hole through which the fuel pump is inserted.

Images