JP3387967B2 - Valve body - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention does not tend to occur at a joint surface between an insert and a resin when a metal pin or the like is inserted into a valve body as a resin molded product. The present invention relates to a structure for preventing pressure leakage. 2. Description of the Related Art For example, there is a type in which a metal pin or the like is inserted and resin-molded, such as a valve element constituting a valve of a fuel tank for an outboard motor. In such a resin molded product with an insert, a very slight gap may be formed between the insert and the resin due to cooling shrinkage during molding. However, in the case of a component that must exert a sealing function, such as a valve body, pressure leakage occurs even in such a small gap, which may hinder the performance of the sealing function. For this reason, conventionally, such a pressure leak was prevented by adding the following step after the molding step. That is, after the molding, the resin molded article is immersed in a filler such as a mogal liquid, so that the filler penetrates into the gap, thereby filling the gap. [0004] The present invention is, however, the method in addition to shall be added step, the only impregnated with the filler, if pressure leakage preventing effect is uncertain was there. For this reason, it is necessary to perform a pressure leak inspection and the like of the valve body , which is a resin molded product, and this is one of the factors that significantly lowers the efficiency of the entire manufacturing process. The present invention has been made in view of the above circumstances, and has as its object to obtain a structure of a valve body , which is a resin molded product, which can omit manufacturing steps as much as possible and can surely eliminate pressure leakage. . [0006] [Means for Solving the Problems] In this invention to solve the above problems, after setting the insert into the mold, the valve body is filled with a resin obtained by forming the shape in the mold And said
The insert is formed in a rod shape having a flange at one end.
On the other hand, when an annular elastic body is fitted around the outer periphery of the insert,
In a state in which one side of the elastic body is in contact with the flange
After setting the insert in the mold with the resin,
The other side surface and outer periphery of the elastic body and the flange
And the elastic body is embedded
It is characterized in that it is filled with the resin and molded. [0007] elastic body is fitted on the outer periphery of the action Inserts Rutotomo
In a state where one side surface of the elastic body is in contact with the flange of the insert, the other side surface and the outer periphery of the elastic body
Part and the outer periphery of the flange are directly covered with resin.
Wherein the resin is filled in, after molding, the elastic body is sufficient close contact with the resin. The elastic body is in close contact with the insert flange.
Also strongly <br/> rather it adheres to the outer periphery of the insert in the straining force of the elastic body as well as. FIG. 1 is a front view of a fuel tank for an outboard motor. FIG. 2 is a longitudinal center sectional view of a fuel lid attached to an opening of a fuel tank. FIG. 3 is a vertical center cross-sectional view of a valve element constituting the fuel valve. FIG. 4 is a left side view of FIG.
FIG. 5 is a cross-sectional view of a mold when the fuel valve is formed.
FIG. 6 is a sectional view taken along line VI-VI of FIG. Reference numeral 10 denotes a fuel tank, which is a container for storing fuel to be supplied to the outboard motor. 12 is the fuel tank 1
0 is a fuel lid fitted into the upper opening. Reference numeral 14 denotes a hose connected to an upstream end of a fuel passage 18 formed in the fuel lid 12. The lower end of the hose 14 is connected to a filter (not shown) located on the bottom surface of the fuel tank 10 and opens into the fuel tank 10 through the filter. Reference numeral 16 denotes a connection hose connected to the downstream end of the fuel passage 18. For example, when repairing an outboard motor,
It is necessary to separate the outboard motor and the fuel tank 10, but this is done by separating the connecting hose 16 from the fuel lid 12. Note that the connection hose 16 is connected to the fuel lid 1.
2, the fuel is supplied from the fuel tank 10 to the engine of the outboard motor through the hose 14, the fuel passage 18 of the fuel lid 12, and the connection hose 16. A fuel valve 20 is provided downstream of the fuel passage 18. As will be described later, the valve 30 of the fuel valve 20 moves left and right, so that the fuel passage 18 is moved.
Are in a closed state and a communicating state. As shown in FIG. 2, the fuel valve 20 has a two-stage cylindrical valve housing 22, a valve element 30 inserted in the valve housing 22, and a valve element 30 which is always in the left direction (FIG. 2). ) And the valve housing 2
2 and an O-ring 26 press-fitted into the inside.
As shown in FIGS. 3 and 4, the valve element 30 includes a valve element main body 32 made of a synthetic resin and a rod-shaped metal valve rod 42.
And an O-ring 44 fitted in the valve rod 42 and provided in proximity to the flange 42a. In addition,
The flange 42a is formed at one end of the valve rod 42.
You. The valve body 32 has four equally spaced grooves 3 on its outer periphery.
When the fuel valve 20 is opened, the fuel passage 18 is formed through the groove 34. The valve body 32 has a back recess 38 at the back and a conical seat 36 at the tip. As will be described later, the valve 3
A valve rod 42 inserted into the valve body 32 at the time of molding is integrally formed with the valve rod 42. A push pin hole 39 formed by a push pin 54 is formed in the center of the rear recess 38 of the valve body 32. Next, the operation of the fuel valve 20 will be described. The valve body 32 is constantly urged leftward (in FIG. 2) by the compression spring 24, and a conical seat portion 36 at the tip thereof is provided.
Are always seated on the O-ring 26. Under this condition,
The fuel passage 18 is closed. By the way, when the connection hose 16 is connected to the fuel lid 12, the valve rod 42 is pushed rightward (in FIG. 2) by a push rod (not shown) provided on the connection hose 16, and the valve body 32 is moved to the valve housing 22.
To the right, the conical seat portion 3 of the valve body 32
6 leaves O-ring 26. Therefore, the fuel passage 18 is in the communicating state, that is, the valve opening state. Next, a molding apparatus for molding the valve body 30 will be described with reference to FIGS. Reference numerals 50 and 52 denote left and right molds constituting the die.
0 and 52 are installed at appropriate positions of an injection molding machine (not shown). On the other hand, a cavity 56 is formed in the mold 50. On the other hand, a push pin 54 is provided in the mold 52 to position the valve rod 42 in the cavity 56. In addition, 58 and 59 are a primary runner and a secondary runner formed in the mold 52. Next, a molding method using the molding apparatus will be described with reference to FIGS. First, O-ring 4
4 from the opposite direction of the flange 42a of the valve rod 42,
It is inserted until it comes into contact with the flange 42a, and is thereby integrated with the valve rod 42. Next, the integrated valve rod 42 is inserted into the mold 5.
0, while the push pin 5 is set in the mold 52.
4 is attached. After these are mounted, the two dies 50 and 52 are put together and installed at a predetermined position of an injection molding machine (not shown). Next, hot and pressurized hot water made of synthetic resin is injected into the mold 52. This hot water reaches the cavity 56 through the primary runner 58 and the secondary runner 59. The above injection is continued until the entire inside of the cavity 56 is filled with hot water. This allows the valve lock
Side of the O-ring 44 that does not contact the flange 42a of the
And the outer peripheral portion and the outer peripheral portion of the collar 42a are directly
The O-ring 44 is completely covered with the hot water.
Buried. Even after the entire cavity 56 is filled with hot water, the inside of the cavity 56 is maintained at a predetermined pressure for a certain period of time. In the meantime, the valve body 32 made of resin and the valve rod 42 made of metal as an insert are integrated with the O-ring 44, and a molded product of the valve 30 is formed in the molds 50 and 52. Next, the two dies 50 and 52 are separated into right and left. At that time, the valve body 30 remains on the mold 50 side, while the push pin 54 remains on the mold 52 side. The push pin 54 is separated from the valve body 30 together with the mold 52. Thereafter, the valve body 30 is pulled out of the mold 50, so that the valve body 30 as a molded product is completed. The valve body 30 formed by the above method is
When functioning as the fuel valve 20 as shown in FIG. 2, the valve body 30 performs a valve function in cooperation with the O-ring 26. That is, when the valve body 30 of the fuel valve 20 is seated on the O-ring 26, the valve is closed, and when the valve body 30 is separated from the O-ring 26, the valve is opened. When the valve is closed, the valve body 30 is seated on the O-ring 26 by the urging force of the compression spring 24,
Exhibits a sealing function. However, for example, the fuel tank 10 is heated by sunlight, the fuel inside evaporates,
When the fuel tank 10 is increased pressure is that the pressure difference before and after the valve element 30 is may arise from this time, O-ring 26 is set to the biasing force of the compression spring 24 so as to overcome even this pressure increase If this is done, there is no problem in the sealing function at this point. However, the gap between the metal valve rod 42 and the resin valve body 32 during cooling after molding is very small, although very small. Can occur. Therefore, when the conventional structure in which the O-ring 44 is not provided as in the present embodiment is used, the leak is transmitted from the push pin hole 39 through a small gap formed around the metal valve rod 42. However, in this embodiment, a gap exists between the O-ring 44 and the valve rod 42 because the O-ring 44 has already been formed integrally with the valve rod 42 at the time of molding. do not do. Furthermore,
Since the O-ring 44 is fitted to the position where it comes into contact with the flange 42a of the valve rod 42, the O-ring 44 is
Abuts not only on the outer periphery of the flange 42a but also on the flange 42a. Therefore, the O-ring 44 is simultaneously provided at two locations with respect to the valve rod 42.
And functions more completely as the leak prevention. The gap between the outer periphery of the O-ring 44 and the resin valve body 32 is not substantially different since the thermal contraction coefficients of the two are not so different. Also, even if the above gap is generated during cooling shrinkage, during injection molding,
Since the O-ring 44 is compressed via the resin and is integrated with the resin in a compressed state, the O-ring 44 expands and fills the gap, so that no leakage occurs from here. O-ring 4
As for No. 4, it is preferable in terms of molding to use a material (for example, nitrile rubber) whose heat-resistant temperature is higher than the melting temperature of the resin. In this embodiment, the fuel valve is exemplified.
The present invention is not limited to such a fuel valve, but includes a fuel connector,
Needless to say, the present invention can be similarly applied to other parts that can exhibit a sealing function such as an air valve. In this embodiment, an O-ring is illustrated as an example of the elastic body. As described above, according to the present invention, the elastic body is fitted to the insert and one side of the elastic body is connected to the insert.
Resin is filled and molded under the condition that it is in contact with the insert flange
By being, even gap is formed between the resin and the insert, two locations of the insert (outer and flange) to
By complementing the elastic body by the elastic body abuts simultaneously prevents pressure leakage resulting, therefore, dipping step and further conventional such fillers such an effect can be largely omitted the inspection process.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an outboard motor fuel tank. FIG. 2 is a longitudinal center sectional view of a fuel lid attached to an opening of a fuel tank. FIG. 3 is a vertical center cross-sectional view of a valve element constituting a fuel valve. FIG. 4 is a left side view of FIG. 3; FIG. 5 is a sectional view of a mold when a fuel valve is formed. FIG. 6 is a sectional view taken along line VI-VI of FIG. 5; [Description of Signs] 18 ... Fuel passage 20 ... Fuel valve 22 ... Valve housing 24 ... Compression spring 30 ... Valve element 32 ... Valve body 36, conical seat 38, rear recess 39, push pin hole 42, valve rod (insert) 42a, collar 44 ····· O-ring (elastic body) 50 ···················································································································· Cavity

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-221774 (JP, A) JP-A-4-5028 (JP, A) JP-A-64-40309 (JP, A) JP-A-54-1979 99224 (JP, A) JP-A-58-191136 (JP, A) JP-A-59-205079 (JP, A) JP-A-61-44613 (JP, A) JP-A-64-51915 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/00-45/84

Claims (1)

(57) After setting the insert into the Patent Claims 1. A mold, in the valve body formed by forming the shape by filling the resin into the mold, the
The insert is formed in a rod shape having a flange at one end.
On the other hand, when an annular elastic body is fitted around the outer periphery of the insert,
In a state in which one side of the elastic body is in contact with the flange
After setting the insert in the mold with the resin,
The other side surface and outer periphery of the elastic body and the flange
And the elastic body is embedded
The valve body by molding by filling the resin such that.