JPS6341576Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an improvement of an electromagnetic fuel injection valve used in an internally twisted engine.

Prior Art This type of conventional electromagnetic fuel injection valve, for example, the one described in Japanese Patent Application Laid-Open No. 104564/1982 is of the bottom feed type, and is of a bottom feed type, in which the end of a spring that gives the ball valve its closing behavior is pressed down. For this reason, the core member has an adjusting screw inserted through it, and by moving the adjusting screw forward and backward, the elasticity of the spring is changed to adjust the fuel injection amount. Fixation was done with an adjustment screw, and the fuel seal between the adjustment screw and the core member was made with an O-ring made of rubber, etc., so the O-ring could slide during adjustment and cause scratches on its surface. Fuel leaks are more likely to occur,
There was a problem with lack of reliability. In addition, in this structure, there are many parts such as the adjustment screw and the female screw portion provided in the core member that require control of machining accuracy, and there is also the problem that the manufacturing cost is high due to the large number of parts.

Purpose In view of the above-mentioned problems, the present invention aims to provide an electromagnetic fuel injection valve that is less likely to cause fuel leakage, has high reliability, and is inexpensive to manufacture.

Overview The electromagnetic fuel injection valve according to the present invention is characterized in that the fuel injection amount adjustment rod is caulked to the core member, and the ball plug is press-fitted into the fuel injection amount adjustment rod insertion hole. .

Embodiment Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIGS. 1 and 2. 1 is a center hole 1a
A generally cylindrical nozzle case 2 made of a magnetic material and having a fuel vapor outlet 1b and a fuel vapor outlet 1b is caulked to the upper end of the nozzle case 1, vertically penetrating the core part 2a provided at the lower end, and having a central A core made of a magnetic material having a fuel injection amount adjustment hole 2b concentric with the hole 1a, and a fuel vapor exhaust passage 2c communicating the hole 2b with the fuel vapor exhaust port 1b; 3 is a central large diameter portion of the core 2; An O-ring fitted to the outer periphery, 4 a coil bobbin fitted to the core part 2a, 5 an electromagnetic coil wound around the coil bobbin 4, and 6 a lower end of the electromagnetic coil 4
A terminal 8 is connected to the fuel injection amount adjustment hole 2b and has a chamfered portion at the lower end, and has an O-ring 7 fitted in the center for airtightness. 8a and a constricted portion 8b that is continuous with the chamfered portion 8a and faces the fuel vapor exhaust path 2c, and the upper small diameter portion of the core 2 is narrowed at the upper end portion of the core 2.
9 is a ball plug press-fitted into the upper end of the fuel injection amount adjustment hole 2b; A center hole 10a that is caulked to the lower end of the nozzle case 1 and is concentric with the center hole 1a;
A pair of fuel inlet holes 1 formed in a spiral direction with respect to the center of the hole 1 and communicating the outer peripheral portion with the center hole 10a.
0b, 10b (see FIG. 2), an inverted conical sheet surface 10c concentric with the center hole 10a, and an orifice 10.
d; 12 is an O-ring fitted to the outer periphery of the lower end of the valve seat 10; 13 is a guide pipe 13 made of a non-magnetic material that is fitted and fixed in both center holes 1a and 10a; A plunger 15 is made of a magnetic material and has a plurality of legs 14a formed at the lower end and fitted so as to be vertically slidable, and a center hole 14b continuous with the legs 14a and communicating with the hole 2b. A ball valve 16, which is welded to the leg portion 14a and capable of contacting the seat surface 10c, is interposed between the plunger 14 and the lower end surface of the fuel injection amount adjustment rod 8, and imparts a downward movement habit to the plunger 14. The spring 17 is located between the lower end surface of the core portion 2a and the upper end surface of the plunger 14, and restricts the upward movement of the plunger 14 and the ball valve 15, and its thickness forms an air gap. 18 is a stopper made of a non-magnetic material, 18 is a nylon filter fitted into the nozzle case 1 and the valve seat 10 so as to surround the outer periphery corresponding to the fuel inlet holes 10b, 10b of the valve seat 10, 19 is a valve A nozzle fitted to the lower end of the sheet 10, 2
0 is a swirl plate which is interposed between the orifice 10d and the nozzle 19 and has a plurality of fuel passages 20a, . . . , 20a formed in a spiral direction with respect to its axis.

Since the electromagnetic fuel injection valve according to the present invention is constructed as described above, when the electromagnetic coil is excited by a signal from a control circuit (not shown), the plunger 14 and the ball valve 15 are drawn upward and opened, and the fuel is injected. After passing through the filter 18, the fuel flows into the center hole 10a through the fuel inlet holes 10b, 10b, since the fuel inlet holes 10b, 10b are formed in a spiral direction with respect to the center of the center hole 10a. , a swirl is generated within the center hole 10a. Next, the fuel is orifice 1
0d, the fuel is sprayed from the nozzle 19 through the fuel passages 20a, . . . , 20a, but at this time, the fuel passages 20a, .
Since it is formed in a helical direction with respect to the axis, more swirl is generated. The basic operation of the electromagnetic fuel injection valve of the present invention has been explained above. The fuel injection amount is adjusted during assembly by directly moving the fuel injection amount adjustment rod 8 up and down. By narrowing the upper small diameter portion of the core 2, the stepped portion 8c of the fuel injection amount adjustment rod 8
Caulk and secure to core 2. Further, fuel sealing is performed by press-fitting the ball plug 9 into the fuel injection amount adjustment hole 2b. Therefore, since the fuel seal is not made of an O-ring made of rubber or the like, but is crimped with metal surfaces concentrically, fuel leakage is less likely to occur and reliability is high. In addition, in this structure, there are almost no parts such as threaded parts that require control of machining accuracy, and the number of parts is small, so the manufacturing cost is low. Incidentally, the fuel vapor generated in the center hole 1a flows between the legs 14a and into the center hole 1.
4b, between the inner surface of the center hole 2b, the chamfered portion 8a, and the constricted portion 8b, and is discharged through the fuel vapor exhaust path 2c and the injection steam exhaust port 1b.

FIG. 3 shows another example of the fuel seal structure, in which the ball plug 9 is replaced by a barrel plug 2.
1 is press-fitted into the fuel injection amount adjustment hole 2b.

Effects of the Invention As described above, the electromagnetic fuel injection valve according to the present invention has the important practical advantages of high reliability and low manufacturing cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of one embodiment of the electromagnetic fuel injection valve according to the present invention, Fig. 2 is an enlarged sectional view showing the fuel seal structure of the above embodiment, and Fig. 3 is another example of the fuel seal structure. FIG. 1... Nozzle case, 2... Core, 3, 7, 1
2... O ring, 4... Coil bobbin, 5... Electromagnetic coil, 6... Terminal, 8... Fuel injection amount adjustment rod, 9... Ball plug, 10... Valve seat, 11... Stroke adjustment shim, 13 ……
Guide pipe, 14... Plunger, 15... Ball valve, 16... Spring, 17... Stopper, 18... Filter, 19... Nozzle, 20
...Swirl plate.

Claims (1)

[Scope of utility model registration request] In order to press the end of the spring that gives the ball valve a valve closing habit, it has a cylindrical fuel injection amount adjustment rod that is inserted into a fuel injection amount adjustment hole drilled in the core member. In a bottom-feed type electromagnetic fuel injection valve configured to adjust the fuel injection amount by changing the set height of the spring to obtain the optimum elasticity by moving an adjustment rod back and forth. ,
A large number of annular steps are formed on the outer peripheral surface of the fuel injection amount adjustment rod, and the annular steps are caulked to the core member, and a metal ball plug is press-fitted into the fuel injection amount adjustment hole. An electromagnetic fuel injection valve characterized by its shape.