JP2567671Y2 - Fuel filter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel filter for an internal combustion engine in which a joint between a cover and a filter element is prevented from peeling and the filter element from falling off.

[0002]

2. Description of the Related Art In an internal combustion engine with a fuel injection device, fuel in a fuel tank is pressurized by a pump, pulsation of discharge pressure of the pump is reduced by a fuel pressure damper, and then filtered by a downstream fuel filter and sent to a fuel injection valve. The surplus fuel is returned to the fuel tank via a return pipe via a fuel pressure regulator, and a fuel filter as shown in FIG. 3 is used in the fuel system.

In this fuel filter, a case is formed by a metal body 1 and a cover 13, and a filter element 10 is disposed inside. The body 1 has an upper end opened and a pipe 2a serving as an inlet fixed to the bottom in a penetrating state. The cover 13 is dish-shaped, and a pipe 14 serving as an outlet is mounted in a central portion thereof in a penetrating state. A filter element such as filter paper or non-woven fabric having a smaller diameter than the case is formed in a chrysanthemum or roll shape inside the case, and a filter element 10 having an end plate 11 fixed to the lower end is fixed to the cover 13 with an adhesive at the upper end. It is arranged and housed.

[0004]

By the way, in this conventional fuel filter, the peripheral portions of the body 1 and the cover 13 are entangled together and are airtightly caulked to form a case. The cover 13 is thin in consideration of the performance. In this order the fuel system, fuel
When the fuel pressure in the case becomes high due to a malfunction of the pressure regulator or the like, the fuel pressure acts on the cover 13 so that the cover 13 swells outward and the fixed filter element 10 peels off and falls off. Might be.

[0005] Regarding the prevention of the separation of the filtration element, Japanese Patent Publication No. 57-6763 and Japanese Utility Model Publication No.
Although there is JP-A-200108, undercutting is required when forming a concave portion directly on a cover or an end plate. When the cover or the end plate is made thin, difficulties arise in workability. There are restrictions on what you can take.

Therefore, the present invention prevents the deformation of the cover and the joint of the joint without impairing the workability at the time of caulking.
An object of the present invention is to provide a fuel filter in which a filter element does not fall off a cover due to peeling of an adhesive .

[0007]

The fuel filter according to the present invention is provided with an annular rising portion (4) having a plurality of slits (5) formed on an inner periphery thereof, and mounted inside the rising portion (4). The mounting hole (3b) of the thin plate-shaped cover (3) having the hole (3b) has an annular step (6) at the lower end, and an annular recess (7) is formed on the peripheral surface of the step (6). ) Provided a columnar outlet member (9), the step (6) of the outlet member (9)
Is inserted into the mounting hole (3b) of the cover (3), and the lower end surface of the center of the outlet member (9) is attached to the mounting hole (3b) of the cover (3).
A cup-shaped body (1) having an opening at the upper end and an inlet member (2) at the bottom is arranged on the lower surface thereof in a state of being in contact with the upper surface outside the peripheral edge of the case. Formed,
An annular filtration element (10) is provided in the case, the upper end of the filtration element (10) is fixed to the cover (3) with an adhesive (12), and the adhesive (12) is covered with the cover (3). ) Are filled in the slit (5) of the rising portion (4) and the concave portion (7) of the outlet member (9).

[0008]

The lower end of the central portion of the outlet member is in contact with and fixed to the cover to reinforce the cover, suppress the outward bulge, and solidify through the slit provided in the rising portion of the cover. The adhesive in the recessed part of the exit member prevents
The outlet element is fastened as if driven by a wedge, so that the filter element is securely held on the cover.

[0009]

FIG. 1 shows an embodiment of the present invention, in which a metal body 1 has a cup shape, a top end is open, and a pipe 2 serving as a fuel inlet penetrates and is fixed at the bottom. I have. The cover 3 is made of metal and has the shape of a thin plate and has a mounting hole 3 in the center.
b is formed, and the inner peripheral edge thereof is bent downward to form an inner peripheral rising portion 4. The rising portion 4 has a plurality of slits 5 in the form of long holes or combs as shown in FIG. , 5a are open. In the mounting hole 3b of the cover 3, both ends have annular step portions 6 and 6a, and an annular concave portion 7 is provided on the peripheral surface of one of the step portions 6, and the central portion 8 serves as an outlet having a hexagonal column shape. Nut-shaped threaded joint or outlet member 9
However, one of the steps 6 is disposed in the mounting hole and the center 8
With its lower end in contact with the outer periphery of the mounting hole 3b , and is fixed by joining means such as brazing. Further, the mounting hole 3b of the cover 3
And between the outer periphery, the concave-convex portion 3a which forms a concentric circle is formed, an annular outer peripheral rising portion 4a is formed is bent in the outside. A filter medium such as filter paper or non-woven fabric is processed into a chrysanthemum or roll shape and formed into a cylindrical shape between the outer peripheral rising portions 4 and 4a of the cover 3, and an end plate 11 is provided at one end thereof.
, The other end of which is hermetically joined via an adhesive. The filtration element 10 fixed to the cover 3 is accommodated in the body 1 and the upper edge of the body 1 and the outer edge of the cover 3 are entangled together and both edges are crimped and accommodated in the case.

At the joint between the cover 3 and the filter element 10, as shown in FIG. 2, the adhesive at the upper end of the filter element 10 flows into each of the slits 5 of the rising portion 4 of the cover 3, and further to the inside thereof. The adhesive 9 is filled and fixed in the recess 7 provided on the side surface of the step 6 of the joint 9 with the inner peripheral end of the adhesive inserted.

In the fuel filter, when the fuel pressure regulator for controlling the amount of fuel supplied to the internal combustion engine or the like does not operate normally in the process of filtering the fuel, the fuel pressure in the fuel filter increases. The lower end of the central part 8 of the joint 9 is fixed to the joint 3, and the central part 8 receives the pressure applied as a reinforcing material for suppressing the swelling, so that the deformation of the cover 3 is prevented and the separation of the filter element 10 is prevented. The adhesive applied to the element 10 sandwiches the rising portion 4 from both sides between the inflow portion into the slit 5 and the filling portion into the joint 9 recess 7, and rises the adhesive inner peripheral edge at the upper end of the filtering element 10. It is fixed as if sewn to the portion 4, acts as a retainer, and the adhesive in the concave portion 7 has the effect of driving a wedge into the joint 9, thereby changing the cover 3. Prevention coupled with filtering element 1
0 is always held by the cover 3 without impairing the sealing performance.

[0012]

As described above, the fuel filter of the present invention has a recess provided in the step provided in the outlet member, and a rising portion provided with a slit provided in the periphery of the mounting hole provided in the cover . Since both were fixed through the slit ,
The inner periphery of the cover is reinforced by the outlet member to suppress the deformation of the cover, and the adhesive of the slit and the recess fixed as if the inner peripheral edge of the upper end of the filter element is sewn to the rising part, which makes the joint with the rising part stronger. And the exit
Adhesive in the recess which is fixed as implanted a wedge out to the wood
The joint with the mouth member is maintained, and in combination with the reinforcement of the cover, the inner peripheral portion does not peel off due to the deformation of the cover, and the inner peripheral edge of the filter element is held double, thereby preventing the filter element from falling off.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the fuel filter of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a longitudinal sectional view of a conventional fuel filter.

FIG. 4 is a sectional view showing various modified examples of a slit at a rising portion of a cover.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body 2 Inlet member (pipe) 3 Cover 3a Uneven part 3b Mounting hole 4 Rise part 5 Slit 6 Step part 7 Concave part 8 Center part 9 Outlet member (joint) 10 Filtration element 12 Adhesive

Claims (1)

(57) [Scope of request for utility model registration] An annular rising portion (4) having a plurality of slits (5) formed on an inner periphery thereof, and a thin plate-like shape having a mounting hole (3b) formed inside the rising portion (4). Mounting hole (3b) for cover (3)
A columnar outlet member (9) having an annular step (6) at the lower end and having an annular recess (7) on the peripheral surface of the step (6),
In the state where the step (6) of (9) is inserted into the mounting hole (3b) of the cover (3), and the lower end surface of the central part of the outlet member (9) is the cover (3).
A cup-shaped body (1) which is disposed in contact with the upper surface of the outer periphery of the mounting hole (3b) and which has an opening at the upper end and an inlet member (2) at the bottom is further provided on the lower surface thereof. Arranged to form a case, an annular filtration element (10) is disposed in the case, and the upper end of the filtration element (10) is fixed to the cover (3) with an adhesive (12), Adhesive (12) covers (3)
Slit (5) of the rising part (4) and the concave part of the exit member (9)
A fuel filter filled in (7).