JPH0724611Y2 - Lid structure of gas-liquid separator in internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Field of Industrial Application This invention is directed to an internal-combustion engine, in particular, a gas-liquid separator installed in the middle of a fuel supply line of a fuel system during a gasoline period ( More specifically, it relates to a structure of a lid of the gas-liquid separator formed by die casting.

(2) Related Art The gaseous component contained in the fuel, which is interposed in the fuel supply line of the fuel system of the internal combustion engine and is fed from the fuel tank through the fuel pump, is separated from the liquid component, and the liquid component A gas-liquid separator that functions to prevent the vapor lock phenomenon of fuel by returning only the fuel to the vaporizer and returning the gaseous components to the fuel tank
-5117, Japanese Patent Publication No. 51-13803, and the like.

In the structure of the lid of the gas-liquid separator, as disclosed in the former publication, a ceiling surface is formed on its inner surface, the diameter of which decreases as it goes upward in order to collect gaseous components. At the same time, a regulating valve chamber, an exhaust hole, etc. communicating with the ceiling surface are formed, the shape thereof becomes complicated, and there are various problems in the molding.

By the way, in the generally adopted die casting molding method, a mold with two halves is prepared, a molten die-cast material is poured into the mold space, and after cooling and solidification, casting is performed, In this casting process, the casting is held in one of the molds, and then the casting in the mold is demolded by an extrusion pin, and this demolding operation can be performed smoothly and quickly. It is essential.

According to the lid structure described above, due to the complexity of its shape, in the casting step, holding of the casting by one die, in other words, demolding of the other die, and casting by the extrusion pin. Demolding may not be performed smoothly.

Further, a pressing trace surface is formed on the surface of the casting surface by pressing the extrusion pin, and the influence of the pressing trace surface cannot be ignored.

(3) Problems to be Solved by the Invention In view of the above situation, the present invention is suitable for the die casting method by modifying the structure of the lid of the seed gas-liquid separator, and its casting operation is It will be done smoothly,
The purpose is to improve the function of the lid itself.

B. Configuration of the Invention (1) Means for Solving Problems The structure of the lid of the gas-liquid separator formed by die casting according to the present invention has the following configuration to achieve the above object.

That is, a casing which forms a container body having an open upper portion, and a flange on the upper surface of which has a recessed packing groove into which an O-ring is inserted; A lid for covering the opening in a sealed manner; and a gas-liquid separator in which a gas-liquid separation chamber is formed inside by the casing and the lid, an outer edge portion being below the lid. Has a flat O-ring abutment surface that comes into contact with the O-ring, and a substantially vertical fitting surface that fits into the opening of the housing is provided inside the O-ring abutment surface. A taper-shaped ceiling surface is formed so as to project downward, and has a diameter that decreases from the lower end of the fitting surface toward the center toward the upper side, and the outer periphery is provided on the upper side of the lid. Ribs that are substantially continuous along with and do not become thicker toward the top, Structure of the lid of the gas-liquid separator that is molded by die casting due to pouring the metal material Yujo into the mold.

(2) Action In die casting of the lid, two dies corresponding to the upper side and the lower side of the lid are prepared, and the die casting material is poured into the casting space in the die, and the die casting material is poured. After cooling and solidifying, in the casting step, the lid casting remains in the upper mold due to the holding force of the ribs, the lower mold is first demolded, and then the extrusion pin is moved to the upper side. It is projected from the mold to the upper surface of the lid casting, and the lid casting is removed from the upper die.

That is, the ribs formed on the upper surface of the lid body have a holding function of staying in the upper mold. Also, in combination with the holding force of the rib, the shape of the lower surface of the lid body facilitates the demolding of the lower mold.

(3) Embodiment An embodiment of the lid structure of the gas-liquid separator of the present invention will be described with reference to the drawings.

(Structure of Embodiment) FIGS. 1 and 2 show a gas-liquid separator according to one embodiment of the present invention.
FIG. 3 shows the partial structure, and FIGS. 4 and 5 show the structure of the lid.

First, the overall structure of the gas-liquid separator S of this embodiment will be described with reference to FIGS. 1 and 2.

The gas-liquid separator S includes a housing 1 and a lid 2 that is hermetically fitted on the housing 1. The housing 1 and the lid 2 are fixed by a set screw 3. To be done.

The housing 1 forms a container body having an open upper part, and an inflow joint metal fitting 5 is press-fitted and installed in an upper portion of a side wall 4 thereof, and an outflow joint metal fitting 6 is similarly press-fitted in a lower portion thereof. Is installed.

The upper edge of the side wall 4 of the housing 1 is outwardly bulged to be thickly formed, and its upper surface forms a flat flange surface 8, and
A packing groove 9 is provided as a recess, and an O-ring 10 is provided in the packing groove 9.
Is fitted.

Further, on the flange surface 8 of the side wall 4, as shown in FIG.
An appropriate number (three in this embodiment) of screw holes 11 are screwed outside the packing groove 9 at substantially equal intervals.

Reference numeral 12 is a mounting body, which is integrally stretched from the lower outer surface of the housing 1, and the gas-liquid separator S is mounted in the engine room through the mounting hole 12a.

The lid body 2 is tightly fitted on the housing 1. For this reason, the lower surface of the lid 2 has a vertical fitting surface 13 that fits along the inner surface of the side wall 4 of the opening of the housing 1, and the housing 1 is provided at the outer edge.
The packing contact surface 14 facing the flange surface 8 is formed in a flat shape.

The lid 2 and the housing 1 are combined with each other to form a gas-liquid separation chamber K therein, and the lid 2 of the present embodiment promotes the gas-liquid separation action, so that the fitting surface 13 The ceiling surface 16 is formed in a tapered shape whose diameter decreases from the lower end toward the center. A recess 19 for fitting a valve seat body 18 on which a ball valve 17 is seated is formed at the center of the ceiling surface 16, and a communication hole 20 is opened in communication with the recess 19. The communication hole 20 includes a vertical passage 21 and a horizontal passage 22.
A joint fitting 23 for discharging a gaseous component is press-fitted and installed at the open end of the.

The upper surface 2a of the lid 2 is substantially flat, but a bulge 24 is integrally formed in the central portion for the communication hole 20 described above.

Then, the rib 25 is continuously provided along the outer edge with one cut 26. The height, width and length of the rib 25 are determined in consideration of the later-described drawing of the mold, but it is essential that the rib 25 does not become thicker toward the top and is substantially continuous. .

Screw insertion holes 27 are formed at three locations along the rib 25.

4 and 5 show only the lid body 2 and the main body portion thereof, and the position of the screw insertion hole 27 is shown.

That is, the screw insertion hole 27 is arranged at a position corresponding to the screw hole 11 of the housing 1, and the screw insertion hole 27 has two positions 27.
a and 27b are provided at the bent portion of the rib 25, but at another place 27c
Is provided at the cut 26 of the rib 25. Therefore, the upper surfaces of the screw insertion holes 27a and 27b formed in the rib 2, that is, the so-called screw seat on which the head of the screw 3 is seated is the same as the upper surface of the rib 25, and the screw seat portions of the other screw insertion holes 27c are formed. Is flush with the upper surface 2a of the lid 2.

In FIG. 4, 28 (indicated by a broken line) indicates a position at which the push-out pin abuts when the lid body 2 described later is released from the mold. There are four push-out pin contact positions 28, and two of them are shared with the screw seats of the screw insertion holes 27a and 27b.

The body of the lid 2 as described above is formed by die casting, and after appropriate cutting and punching, the ball valve 17, the valve seat body 18, and the joint fitting 23 are assembled. Is.

Due to this die casting, an upper mold for forming the upper surface side of the lid body 2 and a lower mold for forming the lower surface side of the lid body 2 are prepared, and these upper and lower mold dies are combined to form the lid body 2. To form a mold space in the body of the. Then, the upper mold is made movable and the extrusion pins are arranged.

Then, this die casting is performed as follows. After pouring the hot water of the die casting material into the mold forming the mold space of the main body of the lid body 2 and cooling and solidifying the hot water, the movable upper mold is pulled out from the lower mold in the casting process, After that, the push-out pin arranged in the upper mold is pressed against a predetermined position on the upper surface of the lid body 2, that is, the push-out pin contact position 28, and the lid body 2 is taken out.

(Operation of Embodiment) In assembling the gas-liquid separator S, the O-ring 10 is attached to the housing 1.
The lid body 2 is fitted through the via and is tightened by the set screw 3, so that the both are integrated.

The inflow joint metal fitting 5 of the gas-liquid separator S is connected to the fuel tank side by a pipe via a fuel pump, and the outflow joint metal fitting 6 is connected to a carburetor via a pipe. Further, the discharge joint fitting 23 is connected to the fuel tank via a pipe line.

The low-density liquid containing the gaseous components is separated from the inlet 5 through the separation chamber K.
To the vaporizer (not shown) through the outlet 6, where the high-density fuel is separated into gas and liquid. The air component rises along the ceiling surface 16 and pushes up the ball valve 17 to open the communication hole 20.
And is returned to the fuel tank (not shown).

Ribs even if water is poured on the upper surface 2a of the lid 2.
It is discharged from the cut 26 of 25 and does not collect on the upper surface.

In die casting of the main body of the lid body 2, the upper die on the upper surface side of the lid body 2 is set to the movable side, and the ribs 25 hold the casting body to ensure demolding from the lower die. Also,
Since the push-out pin pushes the upper surface 2a of the lid body 2, the pressing trace surface does not affect the function of the lid body 2.

The cross-sectional shape of the gas-liquid separator S of this embodiment is substantially rectangular, but the shape is not an essential matter, and any arbitrary shape such as triangular and other polygonal shapes or circular shapes can be adopted. .

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention.

C. Effect of the Invention According to the present invention, a lid body which forms a container body having an open upper part, and a flange on the upper surface of which is provided with a recessed packing groove into which an O-ring is inserted; A lid for covering the opening of the casing in a sealed manner; and a lid for covering the opening of the casing, wherein a gas-liquid separation chamber is formed inside the lid. Has a flat O-ring abutment surface that abuts the O-ring on the outer edge thereof, and the inner portion of the O-ring abutment surface fits into the opening of the housing. A vertically fitting fitting surface is formed so as to protrude downward, and a tapered ceiling surface is formed which is reduced in diameter from the lower end of the fitting surface toward the upper part toward the center, and the lid is provided. On the upper side of the body, a rib that is substantially continuous along the outer periphery is provided so that it can be used in the casting process by die casting. The lid casting reliably stays in the upper die, and is then removed from the upper die by the extrusion pin, and the bottom surface of the lid, that is, the sealing surface which is the O-ring contact surface, has no pressing trace of the extrusion pin. Without being formed, the function of the lid, that is, the sealing performance of the lid can be improved.

In addition, since the upper mold of the lid is movable and the push pin does not come into contact with the lower surface of the lid at all, the lower surface of the lid has a contact mark of the push pin. A shape that cannot be accommodated can be freely arranged, and the degree of freedom in design is improved.

[Brief description of drawings]

The drawings show an embodiment of the lid structure of a gas-liquid separator in an internal combustion engine of the present invention, and FIG. 1 is a partial cross-sectional side view showing the entire structure of the gas-liquid separator of that embodiment (see FIG. 2). II sectional view), FIG. 2 is a plan view thereof, and FIG. 3 is III-III of FIG.
FIG. 4 is a plan view of the main body portion of the lid, and FIG. 5 is a cross-sectional view taken along line VV of FIG. 1 ... Housing, 2 ... Lid, 8 ... Flange surface, 9 ... Packing groove, 10 ... O-ring, 13 ... Mating surface, 14 ... Packing contact surface, 16 ... Ceiling surface , 25 …… rib, 26 …… break, K …… gas-liquid separation chamber

Claims (2)

[Scope of utility model registration request] 1. A case having a container body having an opened upper part and having a recessed packing groove into which an O-ring is inserted, on a flange surface of the upper surface thereof; A lid for covering the opening of the body in a sealed manner; and a gas-liquid separator in which a gas-liquid separation chamber is formed inside by the casing and the lid, the lower side of the lid is The outer edge portion has a flat O-ring abutment surface that abuts the O-ring, and the inside of the O-ring abutment surface is fitted in the opening of the housing and is substantially vertically fitted. A surface is formed so as to project downward, and a tapered ceiling surface is formed whose diameter decreases from the lower end of the fitting surface toward the center toward the upper side, and on the upper side of the lid body. The upper and lower sides are characterized by being provided with ribs that are substantially continuous along the outer circumference and do not become thicker toward the upper side. Structure of the lid of the gas-liquid separator that is molded by die casting due to pouring the metal material Yujo into the mold. 2. The structure of a lid of a gas-liquid separator formed by die casting according to claim 1, wherein the rib has a cut formed at least at one place.