JP2001280209A - Fuel pump unit for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Object] To provide a fuel pump unit device that can very easily cope with a change in the position of a rod insertion hole of a sub tank S. A rod is integrally attached to a cover. The mounting stay J has a rod insertion hole JD penetrating through the cylindrical portion JA, and a side wall JE on the side of the cylindrical portion JA.
A forked hook portion JF is formed at the upper end, and a squash-shaped locking portion JH and a rotation restricting portion JK are formed. The rod insertion hole JD of the mounting stay J is inserted and arranged in the rod L, the forked hook portion JF of the mounting stay J is sandwiched across the upper end SE of the sub tank S, and the melon-shaped locking portion JH locks the sub tank S. Locked in the groove SC, the rotation restricting portion JK is inserted and arranged in the rotation restricting groove SD of the sub tank S. The sub tank S is attached to the cover C via the mounting stay J and the rod L.
It is attached integrally to.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called in-tank type fuel pump unit in which a sub-tank having a fuel pump is housed and arranged in a fuel tank of a vehicle.

[0002]

2. Description of the Related Art In such a conventional fuel pump unit, a pump unit insertion opening formed in a fuel tank is hermetically closed by a cover. Is provided with an electric fuel pump for sucking fuel in the sub tank. A first example of a conventional fuel pump unit will be described with reference to FIG. C is the fuel tank T
The cover L is provided on the lower surface of the cover C, and a rod L is erected downward. S is a sub-tank having a bottomed cup shape with an open top, and a rod insertion hole SC is formed in the side wall of the sub-tank S so as to penetrate vertically from the upper end SA toward the bottom SB. Then, in order to integrally mount the sub tank S on the cover C, the coil spring R is inserted from the lower end of the rod L, then the rod L is inserted into the rod insertion hole SC of the sub tank S, and then from the bottom SB of the sub tank S The E clip E is fitted to the lower end of the rod L projecting downward. According to the above, the rotation of the sub-tank S in the circumferential direction is restricted by the rod L, and the bottom SB of the sub-tank S is pressed and held toward the E clip E by the spring force of the coil spring R, whereby the sub-tank S is integrated with the cover C. Was mounted

A second example of the conventional fuel pump unit will be described with reference to FIG. C is a cover for closing the pump unit insertion opening TA of the fuel tank T, and a rod L is erected downward on the lower surface of the cover C. S is a bottomed cup-shaped sub-tank having an open top, and the upper end SA is provided on the side wall of the sub-tank S.
A rod-shaped insertion hole SC having a bag shape is formed from below to below. To integrally mount the sub tank S toward the cover C, the coil spring R is inserted from the lower end of the rod L, and then the rod L is inserted into the rod insertion hole SC of the sub tank S. According to the above, the rotation of the sub tank S in the circumferential direction is restricted by the rod L, and the sub tank S is pressed downward by the spring force of the coil spring R.

[0004]

In such a conventional fuel pump unit, the sub-tank S is injection-molded using a synthetic resin material for the purpose of reducing the weight of the entire apparatus and reducing the manufacturing cost. According to the above, the rod insertion hole SC formed in the sub tank S is formed by casting during the injection molding. On the other hand, the sub-tank S is provided with an electric fuel pump that sucks and discharges the fuel in the sub-tank S, or a strainer that filters the fuel discharged from the fuel pump and supplies the filtered fuel to the fuel injection valve. These fuel pumps, strainers, etc. may vary depending on the engine mounted. This is performed, for example, to increase the discharge capacity of the fuel pump and the filtration capacity of the strainer.
As described above, according to the change of the fuel pump, the strainer, and the like, it is necessary to change the arrangement in the sub-tank S, and accordingly, the position of the rod insertion hole SC needs to be changed. Further, the change of the rod insertion hole SC is performed by a large correction of the mold or the operation of the mold, and this leads to an increase in the cost of the mold or an increase in the number of development steps for manufacturing the mold. Not.

According to the first conventional example, after inserting a relatively large sub-tank S into the rod L, an E-clip E for holding the sub-tank S is fitted to the lower end of the rod L. The mounting work of the E clip E is extremely difficult. Further, the cover C having the sub tank S is attached to the fuel tank T.
The rod L projects downward from the bottom SB of the sub-tank S when attached to the sub-tank S, and it is necessary to take care that the lower end of the rod L does not directly contact the bottom of the fuel tank T. .

According to the second conventional example, since the rod L is disposed in the bag-shaped rod insertion hole SC, foreign matter is easily stored in the rod insertion hole SC. Slidability may deteriorate.
Further, it is difficult to fit the E-clip E for regulating the sub-tank S at a fixed position to the lower end of the rod L, and it is difficult to hold the sub-tank S with respect to the cover 1 in a sub-assembly state.

[0007] The fuel pump unit device according to the present invention comprises:
The main object of the present invention is to provide the above-described device which can cope with a change in the position of a rod insertion hole formed in a sub-tank very easily, and further sub-assemble the sub-tank to a cover. Another object of the present invention is to improve the workability of mounting the locking member.

[0008]

In order to achieve the above object, the fuel pump unit of the present invention is provided with a fuel tank which is integrally attached to a cover for closing a pump unit insertion opening formed in the fuel tank. In a fuel pump unit device in an internal combustion engine including a sub-tank disposed inside the fuel tank and a fuel pump that pressurizes the fuel in the sub-tank and supplies the fuel to the fuel injection valve, the mounting stay moves the cylinder vertically. A rod insertion hole that penetrates, a squash-like locking portion formed on the side wall portion formed on the side of the cylindrical portion and protruding sideways, and a vertically formed side portion formed on the side wall portion. A mounting stay is provided with a rotation restricting portion protruding and a bifurcated hook portion bent at the upper end of the side wall portion, the upper end being fixed to the cover, and the lower end being detachably fitted with a locking member. Rod insertion hole And the mounting stay is elastically pressed by a spring toward the locking member, while the bifurcated hook portion of the mounting stay is arranged so as to be sandwiched across the upper end of the sub-tank. At the same time, the squash-like locking part is locked in the locking groove drilled in the sub-tank, the rotation restricting part is inserted and arranged in the rotation restricting groove drilled in the sub-tank, and the sub-tank is integrated with the cover via the stay and rod. The first feature is that it is attached in a targeted manner.

The present invention is characterized in that, in addition to the first feature, the material of the mounting stay is formed of a material different from that of the sub-tank.

[0010]

According to the first feature, the mounting stay can be attached to the cover by inserting the spring and the rod insertion hole of the mounting stay from the lower end of the rod and fitting the locking member to the lower end of the rod. The mounting stay can be attached to the sub-tank by holding the bifurcated hook of this mounting stay at the upper end of the sub-tank, locking the squash-like locking part in the locking groove, and inserting the rotation restricting part into the rotation restricting groove. Thus, the sub tank can be integrally attached to the cover.

According to the second feature of the present invention, since the mounting stay is formed of a material different from that of the sub-tank, the sliding property between the mounting stay and the rod is improved, or the rigidity of the mounting stay is improved. For the purpose of improvement etc., it can be selected appropriately regardless of the material of the sub tank.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fuel pump unit according to the present invention will be described below with reference to the drawings. The mounting stay J is shown in FIGS. 3, 4, and 5. 3 is a side view, FIG. 4 is an upper plan view of FIG. 3, and FIG. 5 is a left side view of FIG. The mounting stay J is provided with a cylindrical portion JA having a cylindrical shape in a vertical direction, and a rod insertion hole J is formed from the upper end JB of the cylindrical portion JA to the lower end JC.
D is drilled through. A plate-shaped side wall JE is formed from the vicinity of the upper end of the cylindrical portion JA to the side, and this side wall J is formed.
E extends upward. The side surface shape of the side wall JE is preferably substantially the same as the side wall surface shape of the sub tank described later, but is not limited thereto. The following is formed on the side wall JE. Figure 3 at the top
, A bifurcated hook JF is formed extending leftward, and the left end thereof is bent further downward. The gap A between the forked hook portions JF is formed to be substantially equal to the thickness B of the side wall of the sub-tank described later. Further, two forked hook portions JF are formed facing each other across a line XX passing through the center of the rod insertion hole JD. (The line XX is shown in FIG. 4.) Further, on the left side surface JG of the side wall portion JE, a squash-like locking portion JH protruding leftward is formed. It has a locking surface JJ that forms a flat surface facing upward. Further, a rotation restricting portion JK is formed below the squash-shaped locking portion JH. The rotation regulation part JK is the left side JG of the side wall part JE.
And formed in the vertical direction so as to have a short cross section. As described above, the side wall JE of the mounting stay J is provided.
A fork-shaped hook portion JF, a squash-shaped locking portion JH, and a rotation restricting portion JK are formed downward from the upper end. The mounting stay J is made of a synthetic resin material.

The cover C comprises the following. The cover C includes a flat plate portion CA closing the pump unit insertion opening portion TA of the fuel tank T and a cylindrical portion CB inserted into the pump unit insertion opening portion TA. A boss CC protruding from the lower surface of the flat plate portion CA is provided on the cover C. The upper end LA of the rod L is integrally fixed.
The rod L protrudes downward from the boss CC, and a groove LC is formed near the lower end LB of the rod L for detachably fitting a locking member E such as an E clip.

S is a bottomed cup-shaped sub-tank having an upper opening and a bottom SB, and the side wall SA has a thickness B. A locking groove SC is formed on the side wall SA to lock the squash-shaped locking portion JH of the mounting stay J, and the rotation restricting portion JK can be inserted below the locking groove SC. A vertically long rotation regulating groove SD is formed in the vertical direction. In the present embodiment, the locking groove SC and the rotation restricting groove SD are formed in opposing side walls SA1 and SA2, respectively. The sub-tank S configured as described above is formed of a synthetic resin material for the purpose of reducing the weight and the manufacturing cost.

Next, the assembly of the fuel pump unit will be described with reference to FIGS. First, the mounting stay J is mounted on the cover C. A coiled spring R is inserted from the lower end of the rod L, then the rod insertion hole JD of the mounting stay J is inserted into the rod L, and an E clip as a locking member E is inserted into a groove LC near the lower end LB of the rod L. Fit. According to the above, the stay J attached to the rod L
The mounting stay J is further arranged so that the lower end JC of the cylindrical portion JA faces the locking member E by the spring force of a spring R contracted between the lower end CD of the boss CC and the upper end JB of the cylindrical portion JA. It is elastically pressed and held. (Since the sub-tank S is disposed in the fuel tank T and the bottom surface SB of the sub-tank S is in contact with the bottom portion TB of the fuel tank T in the state of FIG. 1, the lower end JC of the cylindrical portion JA is Located away)

Next, the squash-shaped locking portion JH of the mounting stay J is locked and disposed in the locking groove SC of the side wall SA of the sub tank S, and the rotation restricting portion JK is rotated by the rotation restricting groove SD of the side wall SA.
And further, the bifurcated hook portion JF is clamped across the upper end SE of the sub tank S. According to the above description, the inward displacement and the downward displacement of the mounting stay J are suppressed because the bifurcated hook portion JF straddles the upper end SF of the sub tank S, and the upward displacement of the mounting stay J is prevented. The locking surface JJ of the squash-shaped locking portion JH is restrained from being locked in the locking groove SC, and the rotation of the mounting stay J on the plane is inserted by the rotation restricting portion JK into the rotation restricting groove SD. From being placed, and therefore the sub tank S
Is integrally mounted on the cover C via the mounting stay J and the rod L to form a fuel pump unit device.
In this state, the spring R presses the mounting stay J downward, and the cylindrical portion JA of the mounting stay J is used.
The sub tank S is held in a state where the lower end JC of the rod L contacts the locking member E near the lower end LB of the rod L. Note that the fuel pump unit device includes components such as a fuel pump P and a strainer N, which are simplified and shown in FIG.

The fuel pump unit device is disposed in the fuel tank T through the pump unit insertion opening TA of the fuel tank T. At this time, the pump unit insertion opening TA is in contact with the flat plate portion CA of the cover C and the packing. V
Liquid-tightly closed. According to the above description, the bottom portion SB of the sub tank S is brought into contact with the bottom portion TB of the fuel tank T while compressing the spring R. The sub tank S is held in contact with the bottom portion TB of the fuel tank T by the spring force of the spring R. You.

As described above, according to the fuel pump unit apparatus of the present invention, even when the arrangement of the fuel pump, the strainer, and the like mounted on the sub tank S is changed, the mounting stay J is not changed at all. The mounting stay J can be used in common simply by slightly changing the groove positions of the locking groove SC and the rotation restricting groove SD, thereby achieving a reduction in manufacturing cost. When the sub-tank S is manufactured, if the locking groove and the rotation restricting groove SD are formed in advance in the circumferential direction at equal intervals of, for example, 90 degrees, no modification is required for the sub-tank S.

When the locking member E is fitted into the groove LC at the lower end LB of the rod L, the locking member E can be fitted into the groove LC with the mounting stay J inserted into the rod L. Since the stay J is extremely light and small in comparison with the sub-tank S, its workability can be remarkably improved.

A rod insertion hole JD for inserting a rod L
Is penetrated through the cylindrical portion JA, the rod insertion hole JD is not clogged with foreign matter, and the smooth sliding between the rod L and the rod insertion hole JD can be maintained for a long time.

Further, since the locking member E is detachably fitted to the lower end LB of the rod L, the mounting stay J and the sub-tank S can be removed very easily from the cover C. The maintainability of the equipment was greatly improved. Further, the mounting stay J can be very easily detached from the sub-tank S, whereby the maintenance property of the sub-tank S can be greatly improved.

Further, if the material of the mounting stay J is formed differently from the material of the sub tank S, the mounting stay can be formed optimally. For example, a fluororesin or the like is used to improve the friction and abrasion properties of the rod L.
Nylon resin, polyacetal resin or the like is used to increase rigidity. The selection of these materials is appropriately performed, and the selection of the material of the mounting stay J is determined by the sub tank S.
Not having any effect on the material selection of the mounting stay J and the sub-tank S can greatly improve the degree of freedom in selecting the material.

[0023]

As described above, according to the fuel pump unit device for an internal combustion engine according to the present invention, the mounting stay including the rod insertion hole, the bifurcated hook portion, the urchin-shaped locking portion, and the rotation restricting portion is provided. , Movably connected via a rod insertion hole to a rod erected on the cover, the bifurcated hook of the mounting stay is clamped at the upper end of the sub-tank, and the squash-shaped locking part is inserted into the locking groove of the sub-tank. The sub-tank can be mounted integrally to the sub-tank via the mounting stay by locking and inserting the rotation restricting part into the rotation restricting groove of the sub-tank. This allows the mounting stay to be shared and reduces manufacturing costs. Can be achieved, the workability of attaching the locking member to the lower end of the rod can be significantly improved, and the slidability between the rod and the rod insertion hole can be favorably maintained for a long period of time. In addition, the mounting stay and sub tank can be easily removed from the cover.
This greatly improves the maintenance of the mounting stay and the sub tank. Further, since the material of the mounting stay and the material of the sub-tank are different from each other, the material of the mounting stay can be selected as an optimum material regardless of the material of the sub-tank.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a main part of an embodiment of a fuel pump unit device for an internal combustion engine according to the present invention.

FIG. 2 is a top plan view of a sub tank including the mounting stay of FIG. 1;

FIG. 3 is a front view of a mounting stay used in FIG. 1;

FIG. 4 is an upper plan view of FIG. 3;

FIG. 5 is a left side view of FIG. 3;

FIG. 6 is a longitudinal sectional view of a main part showing a first example of a conventional fuel pump unit device.

FIG. 7 is a vertical sectional view of a main part showing a second example of a conventional fuel pump unit device.

[Explanation of symbols]

 C Cover J Mounting stay JD Rod insertion hole JE Side wall JF Fork-shaped hook JH Urchin-shaped locking JK Rotation restricting S S Subtank SC Locking groove SD Rotation restricting groove L Rod

Claims (2)

[Claims] 1. A sub-tank integrally mounted on a cover for closing a pump unit insertion opening formed in a fuel tank and disposed in the fuel tank, and a fuel injection valve which pressurizes the fuel in the sub-tank and pressurizes the fuel in the sub-tank. In a fuel pump unit device for an internal combustion engine having a fuel pump for supplying fuel toward the cylinder, a mounting stay J is formed in a rod insertion hole JD penetrating the cylinder JA in the vertical direction, and on a side of the cylinder JA. The side wall portion JE has a squash-shaped locking portion JH that protrudes laterally, the side wall portion JE has a rotation restricting portion JK that is formed vertically and protrudes laterally, and the side wall portion JE A fork-shaped hook portion JF is formed at the upper end, and the upper end LA is fixed to the cover C, and the lower end LB is fitted with a rod L to which the locking member E is detachably attached. Move into hole JD The mounting stay J is freely inserted and arranged, and the mounting stay J is elastically pressed toward the locking member E by a spring R. On the other hand, the fork-shaped hook portion JF of the mounting stay J crosses over the upper end SE of the sub tank S. The urchin-shaped locking portion JH is locked in a locking groove SC formed in the sub-tank S, and the rotation restricting portion JK is inserted and disposed in the rotation restricting groove SD formed in the sub-tank S. A fuel pump unit device for an internal combustion engine, wherein S is integrally attached to a cover C via a mounting stay J and a rod L. 2. A fuel pump unit device for an internal combustion engine according to claim 1, wherein the material of the mounting stay is formed of a material different from that of the sub-tank S.