Fuel shooting valve

Abstract

The invention discloses a fuel injection valve. The technical problem to be solved by the invention is to provide a fuel injection valve which can prevent dew condensation and icing on a nozzle plate through a protective body. The technical solution to solve the technical problem is a fuel injection valve comprising a valve body (21) with a valve seat surface (20) formed on the wall surface of the fuel flow passage (2), and a valve body (21) arranged in the fuel flow passage (2). A plug (22), a nozzle plate (23) mounted on the front end face of the valve body (21) and having a plurality of nozzle holes (23a), and a nozzle plate (23) mounted on the outer periphery of the valve body (21) to surround the nozzle plate (23) The protective body (24) configured in the manner of the outer circumference of the valve body (21), wherein the protective body (24) is pressed into the outer circumference of the valve body (21) and the locking protrusion (26a) on the inner circumference locks the locking groove of the valve body (21) The resin shield part (26) of (21a), and the peripheral locking protrusion (26b) that is pressed into the outer periphery of the resin shield part (26) and locks the resin shield part (26) in the locking groove part (27c) And it is constituted by a metal shield member (27) having a shield portion (27b) surrounding the outer periphery of the nozzle plate (23).

Description

technical field [0001] The present invention relates to a fuel injection valve that injects a desired amount at a predetermined time on an intake side of an internal combustion engine. Background technique [0002] Various fuel injection valves are proposed in the prior art. Patent Document 1 discloses a fuel injection valve as an example thereof. [0003] The fuel injection valve 100 of the above-mentioned document, such as Figure 6 As shown, the housing 102 that forms the upper part 101a of the fuel flow passage 101 inside, the valve mechanism 103 that is fixed to the lower part of the housing 102 and opens and closes the lower part 101b of the fuel flow passage 101, and the valve mechanism 103 Solenoid actuator (not shown) that moves between open and closed positions. [0004] The valve mechanism 103 includes a valve body 105 that forms the lower portion 101b of the fuel flow passage 101 and forms a valve seat surface 104 on the wall surface of the lower portion 101b o...

AI Technical Summary

Problems solved by technology

That is, since the fixing of the shield 108 to the valve body 105 depends only on the elastic restoring force of the resin shield member 110, if the diameter of the resin shield member 110 expands to the outside due to thermal expansion, etc., there is a possibility that the valve body 105 can be easily removed from the valve body 105. shedding problem

There is a problem that the detached protective body 108 enters the engine. If it enters the engine, the engine will be damaged.

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