JPH02169859A - Solenoid type fuel injection valve - Google Patents

Abstract

PURPOSE:To split the turning current of fuel into two without impairing its turning force by forming the shape of the fuel injection hole of an adaptor in a way to have a separation wall to connect a measuring orifice to a circular hole after sticking it out in its direction of connection. CONSTITUTION:An adaptor 42 is fixed on the downstream side of a measuring orifice 43 formed on a nozzle 7. The turning current 44 of fuel injected out of the measuring orifice 43 is guided toward a tangential direction to the hole 42a of the adaptor 42 to have it turned along a separation wall 42b and split into two turning currents 44a. The turning current can be split into two without losing its turning force since the current turns along the separation wall 42b.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to magnetic attraction force generated between a stator core and a movable element having a valve body fixed to the tip when an electromagnetic coil is energized. The present invention relates to an electromagnetic fuel injection valve in which a movable element is moved and thereby opens a fuel passage with a valve body fixed to the movable element, and particularly relates to a hole shape of an adapter that can divide the injected fuel into two parts at an equal ratio.

[Conventional technology]

Conventional electromagnetic fuel injection valve of this type
As shown in Publication No. 13, the structure was such that fuel was injected in one direction.

[Problem to be solved by the invention]

The above-mentioned conventional technology has a problem in that even if the fuel injection holes are arranged in two directions, the swirling force of the fuel is impaired.

An object of the present invention is to provide a fuel injection valve that injects fuel in two directions without impairing the swirling force of the fuel.

Means for Solving Problem C1] In order to achieve the above objective, the hole shape of the adapter installed downstream of the metering orifice is shaped to have a separating wall that extends in the tangential direction of the metering orifice hole and then connects it to the circular hole. This is achieved by

[Effect]

The shape of the hole in the adapter is such that it has a separation wall that exits tangentially to the metering orifice hole and connects it to the circular hole, so that the swirling flow of fuel within the metering orifice flows out tangentially and hits the separation wall. Since it turns along the same line, there is no loss of turning power.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. The magnetic @path is a cylindrical yoke with a bottom 3. It consists of a core 2 consisting of a stopper part 2a that closes the open end of the yoke 3 and a columnar part 2b extending to the center of the yoke 3, and a plunger 4 facing the core 2 with a gap in between.

At one end of the columnar part 2b of the core 2, a movable part consisting of a plunger 4 and a ball valve 6 is attached to a seat surface 8 formed in a nozzle 7.
A step is provided to hold a spring 9 as an elastic member that suppresses the force. Swirl 5 guiding ball valve 6
is arranged between the bottom of the yoke 3 and the nozzle 7, and
A fuel passage 5a is provided eccentrically on the side that comes into contact with. A coil 15 that excites the magnetic circuit is wound around the bobbin 13. A terminal 18 of a coil assembly 16 made up of these is inserted into a hole 17 provided in the collar of the core 2, and an O-ring 19 is interposed between the terminal 18 and the core 2. Molding resin on the outside of the injection valve 1 (hereinafter referred to as yoke mold)
A collar 20 is placed over the entrance of the hole 17 to prevent the injector 14a from entering the inside of the injection valve 1 during molding. Also,
An O-ring 12 is interposed between the core 2 and the yoke 3 to prevent fuel from flowing out from the gap between the core 2 and the yoke 3. A gap 22 between the core 2 and the fuel and fuel vapor passage. Upper passage 23. Lower passages 24a, 24b
, 24c are provided. Further, an annular filter 33 is provided on the outer periphery of the yoke 3 to prevent dust and foreign matter in the fuel and piping from entering the valve seat side from the fuel inflow passage 28. A groove is formed in the annular O-ring installation, and the injection valve 1
An O-ring 26 is held there that prevents fuel from flowing out from the gap between the housing and the socket 25. An inflow passage 28 through which fuel flows and an outflow passage 29 through which excess fuel including air bubbles accumulated in the injection valve flows out are opened around the yoke 3. A terminal 18 for transmitting a signal from the control unit 1 to the coil 15 is molded on the upper end of the solenoid valve assembly with mold resin 14 to form a molded connector 35. Further, an annular groove 54 is formed on the outer periphery of the nozzle 7, and an O-ring 4 for sealing the fuel.
1 is interposed. The adapter 42 is attached to the downstream side of the metering orifice 43 formed in the nozzle 7, and as shown in FIG. It is swirled along the wall 42b and divided into two swirling flows 44a.

According to this embodiment, there is an effect that the swirling flow can be divided into two without impairing the swirling force.

〔Effect of the invention〕

According to the present invention, since the swirling flow can be divided into two without impairing the swirling force of the fuel, it is possible to provide a fuel injection valve that injects fuel in two directions.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electromagnetic fuel injection valve according to an embodiment of the present invention, Fig. 2 is a diagram of the shape of the adapter hole seen from the bottom of Fig. 1, and Fig. 3 shows the obstetric rotation state within the adapter hole. FIG. 1... Injection valve, 2... Core, 3... Yoke, 4...
・Plunger, 6...Ball valve, 7...Nozzle, 4
2...Adapter, 42b...Isolation wall.

Claims (1)

[Claims] 1. A stator core made of magnetic material inserted through the center of the annular electromagnetic coil, a mover made of magnetic material installed facing the tip of this stator core, a valve body attached to the tip of this mover, and the like. It consists of an elastic means for urging a movable member consisting of a valve body and the movable element in a direction away from the stator core, and a cylindrical yoke made of a magnetic material and yoke mold resin for housing these parts, and the electromagnetic coil When the valve body is energized, the magnetic attraction force generated between the stator core and the movable element overcomes the biasing force of the elastic means and draws the valve body, thereby opening the fuel outlet port. , an electromagnetic fuel in which fuel given a swirling force by a fuel swirler provided upstream of the valve body flows out into a metering orifice, and an adapter is attached downstream of the metering orifice to divide the fuel injection direction into two directions. An electromagnetic fuel injection valve characterized in that the fuel injection hole of the adapter has a shape having a separation wall that extends in the connection direction of the metering orifice hole and connects to the circular hole.