JP2011208538A - Pump cover mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the ride comfort feeling of occupants by effectively reducing noises in a vehicle compartment.SOLUTION: A pump cover 1 includes a first split body 3 and a second split body 5. Split parts of the first split body 3 and second split body 5 are provided with abutment parts 7, 9 abutting on each other in a combined state with each other. A gap S is formed between the split parts other than the abutment part 7 and abutment part 9 in the combined state of the first split body 3 and second split body 5 by letting the abutment part 7 and abutment part 9 abut on each other. Between the pump cover 1 and a fuel pump P, a sound absorbing member 10 is provided to close the gap S.

Description

  The present invention relates to a mounting structure for a noise-preventing pump cover attached to a fuel pump attached to an automobile engine.

  Conventionally, in gasoline engines and diesel engines for automobiles, the fuel pumped up from the fuel tank is pressurized by the fuel pump, and the fuel pressurized into the cylinders of the engine is accurately injected from the injector, reducing fuel consumption and increasing output. And so on.

  For example, a fuel pump disclosed in Patent Document 1 is attached to an upper part of an engine cylinder head and uses a pump cam provided on a camshaft that drives an intake valve and an exhaust valve of the engine. The fuel is pressurized as the plunger in the fuel pump reciprocates in the cylinder by the operation of the cam.

Japanese Patent No. 4304820 (paragraph 0015, FIG. 4)

  By the way, in the recent automobile industry, it is required to reduce passenger discomfort by eliminating as much noise in the passenger compartment as possible. On the other hand, since the fuel pump attached to the engine as disclosed in Patent Document 1 generates a relatively loud sound during operation due to its structure, it causes an increase in the discomfort of passengers in the passenger compartment. It is one of.

  In order to avoid this, a method of absorbing or insulating the noise of the fuel pump by covering the fuel pump with a pump cover is conceivable. On the other hand, the fuel pump is connected to a pipe serving as a fuel inlet / outlet port, and in order to attach the pump cover to the fuel pump, it is necessary to provide an opening for the pipe on the side wall of the pump cover.

  By the way, when the pump cover is made of resin, when trying to integrally mold the pump cover, the opening for piping becomes an undercut, and an extra slide mold for forming the opening is required, and the mold structure becomes complicated. End up.

  Therefore, in order to cope with the above, it is conceivable that the pump cover has a structure composed of a plurality of divided bodies. However, when the pump cover is structured to have a plurality of divided bodies, the vibration of the engine is divided into the divided bodies. A new noise (battering sound) is generated at the location and the noise is transmitted to the passenger compartment and makes the passenger uncomfortable.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a pump cover mounting structure that can effectively reduce noise in the passenger compartment and improve the ride comfort of the occupant. Is to provide.

  In order to achieve the above object, the present invention is characterized in that a gap is formed at a divided portion of a pump cover formed of a plurality of divided bodies, and the gap is closed with a sound absorbing member.

  Specifically, in the mounting structure in which the resin pump cover for preventing noise is attached to the fuel pump attached to the engine, the following solution is taken.

  That is, in the first invention, the pump cover includes a plurality of divided bodies, and the divided portions of the divided bodies are provided with abutting portions that come into contact with each other in a combined state. In a state where the respective abutting portions are brought into contact with each other and the divided bodies are combined with each other, a gap is formed at a divided portion other than the abutting portion, and a sound absorbing member is provided between the pump cover and the fuel pump. Is provided so as to close the gap.

  According to a second invention, in the first invention, the pump cover is attached to the fuel pump by fixing both the abutting portion and the engine by a fixing means.

  According to a third invention, in the first or second invention, a ridge wall projects from the inner surface of the pump cover.

  In the first invention, since the pump cover has a divided structure, even if there is an opening in the side wall of the pump cover, the pump cover is divided so that the opening does not constitute an undercut, thereby eliminating the slide mold and facing each other. Each split body of the pump cover can be formed only by the fixed mold and the movable mold. Therefore, the structure of the molding die for molding the pump cover becomes simple, and as a result, the pump cover can be molded at a low cost. In addition, when the pump cover is attached to the fuel pump, a gap is formed in addition to the contact portion of the pump cover. Therefore, even if vibration occurs during operation of the engine, the divided bodies do not contact each other in the gap portion. It is possible to eliminate the contact sound that occurs when they come into contact with each other. In addition, since the sound generated from the fuel pump and traveling toward the gap is blocked by the sound absorbing member that closes the gap, the noise of the fuel pump can be prevented from leaking from the gap, and further, the sound absorbing member itself is noisy. Therefore, the noise of the fuel pump leaking from the gap can be reduced. Therefore, it is possible to effectively reduce the noise generated by the vibration of the engine and the noise generated by the fuel pump, and improve the ride comfort of the occupant.

  In the second invention, since the pump cover is directly fixed to the engine, even if the engine vibrates, the vibration of the pump cover with respect to the fuel pump is reduced, so that the fuel pump shakes when the engine vibrates. Therefore, it is possible to reduce the burden on the sound absorbing member caused by the above-mentioned, and to suppress the progress of the deterioration of the sound absorbing member and to effectively reduce the noise for a long period of time.

  In the third aspect of the invention, since the protruding wall absorbs or blocks the sound generated from the fuel pump and traveling radially to the pump cover, the sound leaking outward from the pump cover can be further reduced.

It is the perspective view which looked at the engine for motor vehicles from the cylinder head side in Embodiment 1 of this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is FIG. 1 equivalent view of Embodiment 2 of this invention. It is FIG. 2 equivalent view of Embodiment 2 of this invention. FIG. 4 is a view corresponding to FIG. 3 of Embodiment 2 of the present invention. It is FIG. 2 equivalent view of Embodiment 3 of this invention. It is FIG. 3 equivalent view of Embodiment 3 of this invention. It is FIG. 5 equivalent view of Embodiment 4 of this invention. It is FIG. 6 equivalent view of Embodiment 4 of this invention. It is FIG. 2 equivalent view of Embodiment 5 of this invention. It is FIG. 3 equivalent view of Embodiment 5 of this invention. It is FIG. 1 equivalent view of Embodiment 6 of this invention. It is FIG. 2 equivalent view of Embodiment 6 of this invention. It is FIG. 3 equivalent view of Embodiment 6 of this invention. It is FIG. 4 equivalent view of Embodiment 7 of this invention. FIG. 6 is a view corresponding to FIG. 5 of Embodiment 7 of the present invention. FIG. 10 is a view corresponding to FIG. 6 of Embodiment 7 of the present invention. It is FIG. 4 equivalent view of Embodiment 8 of this invention. (A) is the FIG. 19 equivalent view of Embodiment 9 of this invention, (b) is the C section enlarged view of (a).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.
Embodiment 1 of the Invention
1 to 3 show an automobile engine E to which a pump cover mounting structure according to Embodiment 1 of the present invention is applied. The engine E has a substantially rectangular resin cylinder head cover Ch1 extending along a crankshaft (not shown) of the engine E so as to cover the cylinder head Ch of the engine E, and the cylinder head cover Ch1. A fuel pump P for pressurizing fuel is attached to the cylinder head Ch in the vicinity of the upper surface periphery of the cylinder head Ch. The fuel pump P includes a pump body P1 having a substantially bowl shape and a substantially cylindrical plunger Pr protruding downward from the inside of the pump body P1. As shown in FIGS. 2 and 3, a pump cam Cs1 is attached to the camshaft Cs of the engine E. When the pump cam Cs1 rotates in synchronization with the rotation of the camshaft Cs, this rotational operation is performed. In conjunction with this, the plunger Pr moves up and down in the pump body P1. The plunger Pr moves up and down in the pump body P1 to pressurize the fuel sent from the low pressure fuel pipe Lp shown in FIG. 1 to the pump body P1, and the pressurized fuel is supplied to the high pressure fuel pipe Hp. The pressure is accumulated in a common rail (not shown) through the air and then sent to an injector (not shown) to be injected into each cylinder of the engine E.

  A pump body P1 of the fuel pump P is covered with a resin pump cover 1. The pump cover 1 has a substantially bowl-shaped shape whose lower end is opened and the side wall expands stepwise from above to below, and a first divided body 3 located on the upper side and a first part located on the lower side. It is divided into two parts 5 in the vertical direction at a position substantially below the center in the vertical direction.

  The first divided body 3 has a substantially bowl-like shape that opens downward, and a pair of plate-like contact portions 7 are formed outwardly at the lower edge 3a at positions opposite to each other at approximately 180 °. Projected as a single unit. These abutting portions 7 are formed with through holes 71 penetrating in the vertical direction into which the substantially cylindrical metal bush Bs can be inserted, and the end surface 73 located below the abutting portion 7 has the first surface 73. It is located below the edge 3 a between both contact portions 7 of the divided body 3. In addition, on the side wall between the contact portions 7 of the first divided body 3, the low pressure fuel pipe Lp and the high pressure fuel pipe Hp extending side by side in the horizontal direction can be connected downward to the fuel pump P. A notch recess 11a that is opened is formed. Therefore, when this notch recessed part 11a shape | molds the said 1st division body 3, it can avoid making an undercut by orient | assigning the open side of the said notch recessed part 11a to a mold opening direction.

  The second divided body 5 has a substantially short cylindrical shape, and a pair of plate-like contact portions 9 are integrally formed outwardly at the upper end edge 5a at positions opposite to each other at approximately 180 °. The annular flange 51 is integrally projected inwardly at the lower end edge. The contact portion 9 is formed with a through hole 91 penetrating vertically into which the bush Bs can be inserted so as to correspond to the through hole 71 of the first divided body 3. The end surface 93 located at is located above the end edge 5 a between the two contact portions 9 of the second divided body 5. Further, similarly to the first divided body 3, the low pressure fuel pipe Lp and the high pressure fuel pipe Hp can be connected to the fuel pump P on the side wall between both contact portions 9 of the second divided body 5. A notch recess 11b that opens upward is formed, and when the first divided body 3 and the second divided body 5 are combined, the notched recess 11a and the notched recess 11b form the opening 11. It has become. In the same way as the notch recess 11a, the notch recess 11b avoids an undercut by turning the open side of the notch recess 11b in the mold opening direction when the second divided body 5 is formed. Can do.

  A sound absorbing member 10 is provided between the pump cover 1 and the fuel pump P. The sound absorbing member 10 is accommodated in each of the first divided body 3 and the second divided body 5 inside.

  In the sound absorbing member 10 on the first divided body 3 side, the shape of the open side of the first divided body 3 approximates the shape of the upper part of the fuel pump P, and the first divided body 3 is assembled to the fuel pump P. Furthermore, the outer surface of the fuel pump P is brought into contact with no gap. Further, the end surface 10 a located below the sound absorbing member 10 on the first divided body 3 side is formed so as to be substantially the same as the position of the end surface 73 of the contact portion 7 or below the end surface 73.

  On the other hand, in the sound absorbing member 10 on the second divided body 5 side, the shape of the upper open side of the second divided body 5 approximates the outer surface shape of the lower portion of the fuel pump P, and the second divided body 5 is connected to the fuel pump P. When assembled, the outer surface of the fuel pump P is brought into contact with no gap. Further, the end surface 10 b located above the sound absorbing member 10 on the second divided body 5 side is formed to be substantially the same as the position of the end surface 93 of the contact portion 9 or located above the end surface 93.

  The sound absorbing member 10 is preferably in pressure contact with the outer surface of the fuel pump P, and there is no particular problem even if a non-contact portion occurs.

  Further, the lower end portion of the sound absorbing member 10 located on the lower side is formed so as to fill the space between the lower portion of the fuel pump P and the protruding end edge of the flange 51, and the lower end surface thereof is the lower end surface of the flange 51. It is almost the same as the position.

  In the second divided body 5, the bush Bs is press-fitted into the through hole 91 so that the upper side of the bush Bs protrudes upward from the end surface 93 of the contact portion 9, and the boss portion of the cylinder head cover Ch <b> 1. The second divided body 5 is set on the cylinder head cover Ch1 by placing the contact portions 9 of the second divided body 5 on the boss portions Ch2 so that the bush Bs corresponds to the screw hole h1 of Ch2. It has become.

  Further, a heat insulating sealing material C continuous along the protruding edge of the flange 51 is disposed on the engine E side of the peripheral edge of the flange 51, and the sealing material C is connected to the cylinder head cover Ch1 and the flange. The space between 51 is filled. Therefore, the sound generated from the fuel pump P by the sealing material C is prevented from leaking outward from between the cylinder head cover Ch1 and the flange 51.

  Then, the fuel pump P, to which no piping or the like is connected, is attached to the cylinder head Ch, and in this state, the first divided body 3 fits the through holes 71 of the first divided body 3 into the bushes Bs from above. By doing so, a bolt (fixing means) B is inserted into the bush Bs from above, and the bolt B is screwed into the screw hole h1 of the boss portion Ch2. Accordingly, the sound absorbing member 10 on the first divided body 3 side and the sound absorbing member 10 on the second divided body 5 side are in contact with or pressed against each other, and the contact portion 7 of the first divided body 3 is in contact with the second divided body 5. The pump cover 1 is fixed to the engine E and is attached to the fuel pump P by contacting the contact portion 9.

  The end surface 73 positioned below the contact portion 7 is positioned below the lower end edge 3a of the first divided body 3, and the end surface 93 positioned above the contact portion 9 is the second end surface 93. Since it is located above the upper end edge 5a of the divided body 5, when the abutting portion 7 and the abutting portion 9 abut, the lower end edge 3a between the abutting portions 7 of the first divided body 3 and the second edge 3a. A gap S is formed between the upper end edge 5 a between the two contact portions 9 of the divided body 5.

  Further, the two sound absorbing members 10 located on the upper side and the lower side are in contact with each other or pressed into close contact with each other without any gap, so that the sound absorbing member 10 is between the first divided body 3 and the second divided body 5. The gap S formed at the end is closed.

  As described above, according to the first embodiment of the present invention, since the pump cover 1 has a divided structure, the pump cover 1 is divided so that the opening does not constitute an undercut even if the opening 11 is provided on the side wall of the pump cover 1. Thus, the slide mold can be eliminated, and the first divided body 3 and the second divided body 5 of the pump cover 1 can be formed using only the fixed mold and the movable mold facing each other. Therefore, the structure of the molding die for molding the pump cover 1 becomes simple, and as a result, the pump cover 1 can be molded at a low cost. Further, when the pump cover 1 is attached to the fuel pump P, a gap S is formed in addition to the abutting portions 7 and 9 of the pump cover 1, so that even if vibration occurs during operation of the engine E, the first in the gap S portion. The divided body 3 and the second divided body 5 do not come into contact with each other, and the contact sound generated when the divided bodies come into contact with each other can be eliminated. Further, since the sound generated from the fuel pump P and traveling toward the gap S is blocked by the sound absorbing member 10 that closes the gap S, the noise of the fuel pump P can be prevented from leaking from the gap S. Since the sound absorbing member 10 itself absorbs noise, the noise of the fuel pump P leaking from the gap S can be reduced. Therefore, the noise generated by the vibration of the engine E and the noise generated by the fuel pump can be effectively reduced, and the ride comfort of the occupant can be improved.

In addition, since the pump cover P is directly fixed to the engine E, even if the engine E vibrates, the vibration of the pump cover 1 with respect to the fuel pump P becomes small. Therefore, when the engine E vibrates, the fuel pump P It is possible to reduce the burden on the sound-absorbing member 10 generated by shaking of the sound-absorbing member, and to suppress the progress of deterioration of the sound-absorbing member 10 and to effectively reduce noise for a long period of time.
<< Embodiment 2 of the Invention >>
4 to 6 show a mounting structure of the pump cover 1 according to the second embodiment of the present invention. The second embodiment is different from the first embodiment only in that two divided bodies divided in the horizontal direction are combined instead of combining the upper and lower divided bodies like the pump cover 1 of the first embodiment. Since the rest is the same as that of the first embodiment, only the parts different from the first embodiment will be described in detail below.

  As shown in FIG. 4, on the upper surface of the cylinder head cover Ch <b> 1 of the engine E, a pair of substantially rectangular mounting plate portions Ch <b> 3 having screw holes h <b> 2 penetrating in the width direction of the engine E are aligned in the longitudinal direction of the engine E. A pair of upper protrusions are provided, and the pump cover 1 is attached to the attachment plate portion Ch3.

  The first divided body 3 and the second divided body 5 of the pump cover 1 are formed by vertically dividing a substantially bowl-shaped shape in the engine E width direction, and the bolt B is connected to the through hole 71 of the first divided body 3 and It inserts into the through-hole 91 of the 2nd division body 5 from a side, and is fixed to the engine E by screwing in the screw hole h2 of the said mounting plate part Ch3. As shown in FIG. 4, the low pressure fuel pipe Lp and the high pressure fuel pipe Hp extending in parallel can be connected to the fuel pump P on the side wall between both contact portions 7 of the first divided body 3. A substantially rectangular opening 11 is formed. When the first divided body 3 is molded, the opening 11 can be prevented from being undercut by directing the opening 11 in the mold opening direction.

As described above, according to the second embodiment of the present invention, the pump cover 1 is not combined with the two upper and lower divided bodies as in the first embodiment, but the first divided body 3 and the second divided body 5 divided in the horizontal direction. Even in a configuration in which these are combined, the same effect as in the first embodiment can be obtained.
<< Embodiment 3 of the Invention >>
7 and 8 show a mounting structure of the pump cover 1 according to Embodiment 3 of the present invention. In the third embodiment, only a part of the structure in the pump cover 1 is different from that of the first embodiment, and the others are the same as those of the first embodiment. Therefore, only different parts will be described in detail below.

  On the inner surface of the first divided body 3, a plate-like ridge wall 3c extending in a lattice shape in the longitudinal direction and the width direction of the engine E is integrally projected downward. And the protrusion end of each rib wall 3c is a position which does not contact the outer periphery of the fuel pump P when the first divided body 3 is attached to the fuel pump P.

  On the inner surface of the second divided body 5, a plate-like projecting wall 5 c extending in a lattice shape in the longitudinal direction and the width direction of the engine E with the fuel pump P interposed therebetween is projected upward. The tip of the rib wall 5c is located at a position not facing the tip of the rib wall 3c provided on the first divided body 3 with the pump cover 1 attached to the fuel pump P. It is located above the end surface 93 of the contact portion 9 and between the fuel pump P and the gap S. In this way, the noise traveling radially from the fuel pump P is double-blocked by the pump cover 1 and the ridge walls 3c, 5c. Further, since the tip of the ridge wall 5c is located between the fuel pump P and the gap S, the noise traveling from the fuel pump P to the gap S is blocked by the ridge wall 5c. Therefore, the noise generated from the fuel pump P can be effectively prevented from leaking to the outside of the pump cover 1 by providing the protruding wall 3c and the protruding wall 5c.

  The sound absorbing member 10 is made of foamed urethane formed by injecting a foamed urethane raw material into the first divided body 3 and the second divided body 5 and then foaming the foamed material. Even if the strip wall 3c and the projecting wall 5c are provided inside the first divided body 3 and the second divided body 5, the urethane foam reaches every corner, and the sound absorbing member 10 has no gap and the first divided body 3 and It is buried inside the second divided body 5.

  The end surfaces 10a of the sound absorbing member 10 on the first divided body 3 side located on both sides of the engine E in the longitudinal direction and both sides in the width direction are recessed in a substantially U-shaped cross section and extend in the engine E width direction and the longitudinal direction. 10c is formed. Further, the end faces 10b located on both sides in the longitudinal direction of the engine E and both sides in the width direction of the sound absorbing member 10 on the second divided body 5 side have a substantially U-shaped cross section so as to cover the protruding end of the ridge wall 5c. A protruding portion 10d that protrudes and extends in the width direction and the longitudinal direction of the engine E is formed, and corresponds to the recessed portion 10c when the upper and lower sound absorbing members 10 are combined with each other.

  As described above, according to the third embodiment of the present invention, the same effects as those of the first embodiment can be obtained, and the sound generated from the fuel pump P and traveling radially to the pump cover 1 can be generated from the ridge wall 3c and the ridge wall 5c. As a result, the sound leaking outward from the pump cover 1 can be further reduced.

  The ridge wall 3c and the ridge wall 5c extend in a lattice shape in the longitudinal direction and the width direction of the engine E, but may be any one that blocks noise generated from the fuel pump P. It may extend only in the longitudinal direction or may extend only in the width direction of the engine E. The rib wall 3c and the rib wall 5c may be annular rib walls extending along the inner surface of the pump cover 1 at a predetermined interval from the inner surface of the pump cover 1. Furthermore, the structure which arrange | positions the protrusion wall 3c and the protrusion wall 5c intermittently in the inner surface of the pump cover 1 may be sufficient.

  In addition, with the pump cover 1 attached to the fuel pump P, the tip of the ridge wall 5c is positioned so as not to face the tip of the ridge wall 3c provided on the first divided body 3. It may be a position facing the strip wall 3c.

Further, in a state where the pump cover 1 is attached to the fuel pump P, at least one of the ridge wall 3c and the ridge wall 5c may protrude to a position where the gap between the fuel pump P and the gap S is blocked.
<< Embodiment 4 of the Invention >>
9 to 10 show a mounting structure of the pump cover 1 according to the fourth embodiment of the present invention. In the fourth embodiment, only a part of the structure inside the pump cover 1 is different from that of the second embodiment, and the other parts are the same as those of the second embodiment. Therefore, only different parts will be described in detail below.

  On the inner surface of the first divided body 3, a plate-like protruding wall 3 d is provided so as to project toward the second divided body 5, and a plurality of the protruding wall 3 d are provided in parallel in the vertical direction. . The projecting wall 3d is located inside the sound absorbing member 10 on the first divided body 3 side, and its protruding end does not contact the outer periphery of the fuel pump P when the pump cover 1 is attached to the fuel pump P. Is in position.

  A plate-like protruding wall 5d is provided on the inner surface of the second divided body 5 toward the first divided body 3 side so that the protruding wall 5d corresponds to the protruding wall 3d. A plurality of them are provided in parallel in the vertical direction. The projecting wall 5d is located inside the sound absorbing member 10 on the second divided body 5 side, and its protruding end does not contact the outer periphery of the fuel pump P when the pump cover 1 is attached to the fuel pump P. Is in position.

  As described above, according to the fourth embodiment of the present invention, the same effects as those of the second embodiment can be obtained, and the sound generated from the fuel pump P and traveling radially to the pump cover 1 can be generated from the ridge wall 3d and the ridge wall 5d. As a result, the sound leaking outward from the pump cover 1 can be further reduced.

  In the pump cover 1 of the third embodiment, the first divided body 3 and the second divided body 5 are integrally provided with the ridge wall 3c and the ridge wall 5c. In the pump cover 1 of the fourth embodiment, the first divided body 3 is provided. In addition, the rib wall 3d and the rib wall 5d are integrally provided in the second divided body 5. However, the rib walls 3c, 3d, 5c, and 5d may be formed as separate members, for example, have sound absorbing properties. A member made of a fiber layer is used as a projecting wall, and the sound absorbing member 10 is buried between the projecting walls without any gaps, so that the projecting wall is fixed in the pump cover 1 to obtain a pump cover 1 having a high sound absorbing property. You may do it.

  In addition, the sound absorbing member 10 is provided by providing slits in the protruding walls 3c, 3d, 5c, and 5d so that the urethane foam can easily move in the pump cover 1 even if the protruding walls 3c, 3d, 5c, and 5d are present. May be embedded in the pump cover 1 without a gap.

Further, in a state where the pump cover 1 is attached to the fuel pump P, at least one of the projecting wall 3d and the projecting wall 5d may project to a position where the gap between the fuel pump P and the gap S is blocked.
<< Embodiment 5 of the Invention >>
11 and 12 show a mounting structure of the pump cover 1 according to the fifth embodiment of the present invention. In the fifth embodiment, the partial structure of the second divided body 5 is different from that of the first embodiment, and the vertical length of the boss portion Ch2 of the cylinder head cover Ch1 is increased accordingly. Since this is the same as that of the first embodiment, only different parts will be described in detail below.

  The side wall of the second divided body 5 is longer in the vertical direction than in the first embodiment. Further, the position of the peripheral edge of the protruding end of the flange 51 of the second divided body 5 is located inside the outer peripheral edge of the pump body P1 of the fuel pump P, and the flange 51 is located between the pump body P1 and the upper surface of the cylinder head cover Ch1. The protruding end side is positioned.

As described above, according to the fifth embodiment of the present invention, the same effect as in the first embodiment is obtained, and the protruding end side of the flange 51 is located between the pump body P1 and the upper surface of the cylinder head cover Ch1, The area in which the pump cover 1 covers the pump body P1 can be made wider than that of the first embodiment, and noise generated from the fuel pump P can be prevented from leaking from the pump cover 1.
Embodiment 6 of the Invention
13 to 15 show a mounting structure of the pump cover 1 according to the sixth embodiment of the present invention. In this Embodiment 6, since a part of 1st division body 3 is different from Embodiment 1, and others are the same as Embodiment 1, only a different part is demonstrated in detail hereafter.

  The pump cover 1 of Embodiment 6 has a fitting structure that is attached so that the lower end opening periphery of the first divided body 3 covers the upper end opening periphery of the second divided body 5, and the edge of the first divided body 3 Between each contact part 7 in 3a, a cover wall part 3e having a substantially L-shaped cross section is formed extending outward and extending downward from the extended end. In a state where the first divided body 3 and the second divided body 5 are combined, the cover wall portion 3 e is not in contact with the second divided body 5. Moreover, the lower end of the cover wall part 3e is located below the edge 5a of the 2nd division body 5, and the clearance gap S cannot be seen from the outer side by the said cover wall part 3e.

As described above, according to the sixth embodiment of the present invention, the same effect as in the first embodiment can be obtained, and the gap S formed when the first divided body 3 and the second divided body 5 are combined from the outside. Since the cover wall 3e is covered, it becomes difficult for unnecessary materials such as water to enter the pump cover 1 from the gap S, and failure of the fuel pump P caused by the unnecessary materials can be avoided.
<< Embodiment 7 of the Invention >>
16 to 18 show the mounting structure of the pump cover 1 according to the seventh embodiment of the present invention. In the seventh embodiment, since the partial structure of the first divided body 3 is different from that of the second embodiment and the other parts are the same as those of the second embodiment, only different parts will be described in detail below.

  The pump cover 1 of the seventh embodiment has a fitting structure that is attached so that the second divided body side opening periphery of the first divided body 3 covers the first divided body side opening periphery of the second divided body 5. The edge 3a located between the contact portions 7 of the body 3 is formed with a cover wall portion 3f having a substantially L-shaped cross section that extends outward and extends from the extended end to the second divided body 5 side. Yes. In a state where the first divided body 3 and the second divided body 5 are combined, the cover wall portion 3 f is not in contact with the second divided body 5. Moreover, the edge part of the cover wall part 3f is located in the 2nd divided body 5 side from the edge 5a of the 2nd divided body 5, and the clearance gap S cannot be seen from the outside by the said cover wall part 3f. Yes.

  As described above, according to the seventh embodiment of the present invention, the same effect as in the second embodiment can be obtained, and the gap S formed when the first divided body 3 and the second divided body 5 are combined from the outside. Since the cover wall 3f is covered, it becomes difficult for unnecessary substances such as water to enter the pump cover 1 from the gap S, and failure of the fuel pump P caused by the unnecessary objects can be avoided.

In the sixth and seventh embodiments of the present invention, the sound absorbing member 10 is disposed in the gap S formed between the inner surfaces of the cover wall portions 3e and 3f and the opening side periphery of the second divided body 5. Further, noise generated from the fuel pump P may be prevented from leaking from the gap S.
<< Embodiment 8 of the Invention >>
FIG. 19 shows a mounting structure of the pump cover 1 according to the eighth embodiment of the present invention. The eighth embodiment is different from the second embodiment in that the pump cover 1 is not fixed to the cylinder head cover Ch1, and the other portions are the same as those in the second embodiment. Therefore, only different parts will be described in detail below.

  Although not shown in the drawings, the abutment portion 9 of the second divided body 5 has an insert nut embedded so that the shaft center coincides with the width direction of the engine E, and is formed in the abutting portion 7 of the first divided body 3. The through-hole 71 corresponds to the insert nut when the first divided body 3 and the second divided body 5 are assembled. The cylinder head cover Ch1 is not provided with the mounting plate portion Ch3 as in the second embodiment. Accordingly, the bolt B is inserted into the through hole 71 of the contact portion 7 and the bolt B is screwed into the insert nut of the contact portion 9 so that the sound absorbing member 10 is pressed against the fuel pump P and the pump cover 1 is connected to the fuel pump. Attach to P.

As described above, according to the eighth embodiment of the present invention, the noise generated by the vibration of the engine E and the noise generated by the fuel pump can be effectively obtained without fixing the pump cover 1 to the cylinder head cover Ch1 as in the second embodiment. And the ride comfort of the occupant can be improved.
<< Ninth Embodiment of the Invention >>
Fig.20 (a) shows the attachment structure of the pump cover 1 which concerns on Embodiment 9 of this invention. In the ninth embodiment, the fixing method when assembling the first divided body 3 and the second divided body 5 is different from that of the eighth embodiment, and the other parts are the same as those of the eighth embodiment. This will be described in detail.

  As shown in FIG. 20 (b), a fixed piece (fixing means) 77 is integrally provided in each contact portion 7 of the first divided body 3, and the fixed member 77 is connected to the contact portion 7. A pair of flexible engagement pieces 75a protruding from the upper and lower ends of the second divided body 5 side by side, and engagement claws protruding in directions facing each other at the tips of the engagement pieces 75a 75b. Then, when the respective contact portions 9 of the second divided body 5 are inserted between the engagement pieces 75a, the two engagement pieces 75a are deformed after being bent away from each other by the insertion force. The part 9 is caught by the engaging claw 75 b, and the second divided body 5 is fixed to the first divided body 3.

  As described above, according to the ninth embodiment of the present invention, the same effect as in the eighth embodiment can be obtained, and when the pump cover 1 is attached to the fuel pump P, the first divided body 3 and the first divided body 3 are sandwiched between the fuel pump P. Since it is only necessary to bring the bifurcated body 5 close to each other, the mounting operation of the pump cover 1 is very simple and easy.

  In addition, although Embodiment 1-9 of this invention demonstrated the pump cover 1 which consists of two division bodies, the said pump cover 1 may consist of three or more division bodies.

  Moreover, although Embodiment 1-9 of this invention demonstrated with what divided the pump cover 1 into 2 parts vertically and what was divided vertically in the engine E width direction, the division | segmentation location of the pump cover 1 was described above. For example, the pump cover 1 may be divided obliquely without being limited to the position. Furthermore, the division | segmentation location may not be a linear shape, for example, may be a wave shape.

  Moreover, in Embodiment 1-9 of this invention, although the pump cover 1 was made into the substantially bowl shape, what is necessary is just the shape which covers the fuel pump P, for example, a spherical thing may be sufficient.

  Further, the end surfaces 10a and 10b of the sound absorbing member 10 provided in each of the first divided body 3 and the second divided body 5 of the first to ninth embodiments are combined with the first divided body 3 and the second divided body 5. The position of the end surfaces 10a and 10b is as long as the sound absorbing member 10 closes the gap S when the pump cover 1 is attached to the fuel pump P. It may be in any place in the pump cover 1.

  In Embodiments 1 to 9 of the present invention, the heat-insulating sealing material C is disposed between the pump cover 1 and the cylinder head cover Ch1. A member may be provided so that noise generated from the fuel pump P can be absorbed.

  The present invention is suitable, for example, for a mounting structure for a noise-preventing pump cover attached to a fuel pump attached to an automobile engine.

DESCRIPTION OF SYMBOLS 1 Pump cover 3 1st division body 3c Projection wall 3d Projection wall 5 2nd division body 5c Projection wall 5d Projection wall 7 Contact part 9 Contact part 10 Sound absorption member 77 Fixing member P Fuel pump E Engine B Bolt (Fixing means)
S clearance

Claims (3)

A mounting structure for attaching a resin pump cover for noise prevention to a fuel pump attached to an engine,
The pump cover includes a plurality of divided bodies, and a divided portion of each divided body is provided with an abutting portion that abuts in a combined state,
In a state where the abutting portions of the plurality of divided bodies are brought into contact with each other and the divided bodies are combined with each other, a gap is formed in a divided portion other than the abutting portion,
A pump cover mounting structure, wherein a sound absorbing member is provided between the pump cover and the fuel pump so as to close the gap. The mounting structure of the pump cover according to claim 1,
The pump cover mounting structure, wherein the abutting portion and the engine are both fixed to the fuel pump by fixing means. The pump cover mounting structure according to claim 1 or 2,
A pump cover mounting structure, characterized in that a projecting wall projects from the inner surface of the pump cover.

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