JPS6361770A - Electromagnetic type fuel injection valve - Google Patents

Abstract

PURPOSE:To enable effective reduction of the generation of working noise through suppression and damping of vibration of a bottom wall, by a method wherein a rubber body is located between the bottom wall of a connector for receiving the end of the inner cylinder of a connector for feeding. CONSTITUTION:A rubber cover 33 for water-proof of a connector 3 for feeding is a bag body with a closed tip, provided with a through-hole 331 through which to insert a collecting pin 23, and the opening edge of the upper end is securely locked to a projection 312 of the connector 3 for receiving. The whole of the outer peripheral surface of an inner cylinder 31 is covered with the rubber cover, and is forced into pressure contact with a cylinder wall 21 of a connector 2 for receiving to prevent entrance of rain water. In which case, the tip end surface of the rubber cover 33 is located on a bottom wall 22 of the connector 2 for receiving, and is brought into pressure contact with the bottom wall 22 and an end 311 of an inner cylinder 31 therebetween. Working vibration of a fuel injection valve is propagated to the connector 2 for receiving to vibrate the bottom wall 22, but the vibration is suppressed and damped by means of the rubber cover 33, and radiation of working noise from the bottom wall 22 is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electromagnetic fuel injection valve, and particularly to its noise prevention structure.

[Prior Art] An electromagnetic fuel injection valve has an electromagnetic coil provided in a cylindrical housing, and the electromagnetic coil attracts a needle valve to open a fuel injection nozzle at the tip of the housing. The needle valve is brought into contact with the valve seat by a spring force when the nozzle is closed, and is positioned by being brought into contact with a stopper when the nozzle is opened.

[Problems to be Solved by the Invention] By the way, the operating cycle of the above needle valve is about 100/
S to 100C/S, there is a problem that the valve comes into contact with the valve seat or stopper during this cycle and generates operating noise.

In this case, the valve seat and stopper, which are sources of noise, have restrictions on their shape in order to ensure good injection characteristics, and it is not easy to modify them, so it is required to reduce noise without modifying them. ing.

Against this background, for example, Japanese Unexamined Patent Application Publication No. 56-85556 and Japanese Utility Model Application No. 58-29161 disclose a fuel injection valve in which a housing body is covered with an elastic cover that also serves as heat insulation. According to experiments, the noise transmitted from the noise source and radiated from the housing body is relatively small, and rather the majority of the noise is radiated from the power receiving connector installed in the housing to receive the excitation signal of the electromagnetic coil. occupies .

The present invention has been made based on this knowledge, and an object of the present invention is to provide an electromagnetic fuel injection valve that can effectively reduce operating noise without modifying the fuel injection valve main body.

[Means for Solving the Problems] To explain the configuration of the present invention with reference to FIG. 1, the power receiving connector 2
is in the form of a cylinder with a bottom, and a power receiving pin 23 is erected at the center of the bottom wall 22. The power supply connector 3 consists of an inner cylinder 31 and an outer cylinder 32, the inner cylinder 31 contacts the inner periphery of the cylinder wall 21 of the power receiving connector 2 through a waterproof rubber body 33 covering the outer periphery, and the outer cylinder 32 It is in contact with the outer periphery of the wall 21.

The waterproof rubber body 33 extends above the bottom wall 22 and is interposed between it and the cylinder end 311 of the inner cylinder 31.

[Operations and Effects] Vibration during operation of the fuel injection valve reaches the power receiving connector 2 and causes its bottom wall 22 to vibrate. Therefore, the bottom wall 22 and the inner cylinder 31
Since the waterproof rubber body 33 is interposed between the cylindrical ends 311, vibrations of the bottom wall 22 are suppressed and attenuated by the waterproof rubber body 33.

[Example] Fig. 3 shows an electromagnetic fuel injection valve, in which the cylindrical housing 1
A needle valve 12 is provided inside the housing 1 so as to be movable back and forth, and opens and closes a nozzle 13 at the tip of the housing 1. A fixed core 10 and an electromagnetic coil 11 are provided in the housing 1, and the needle valve 12 is closed when the electromagnetic coil 1 is closed.
When 1 is not energized, the spring member of the circuit activates the valve seat 1/! 4, and when the electromagnetic coil 11 is energized, it is attracted by the fixed core 10 and retreats, and is brought into contact with the stopper 15.

A power receiving connector 2 made of resin is protruded from the outer periphery of the rear end of the housing 1, and a power feeding connector 3 is covered and coupled to the power receiving connector 2. Figure 1 shows the details of the connector section.

In the figure, the power receiving connector 2 is a bottomed cylindrical body having a cylindrical wall 21 and a bottom wall 22, and a power receiving pin 23 that is electrically connected to the electric current 11 is erected at the center of the bottom wall 22.

The power supply connector 3 covered with the power reception connector 2 is a double cylinder body consisting of an inner cylinder 31 and an outer cylinder 32, and the cylinder wall 21
A cylinder end 311 of the inner cylinder 31 inserted therein faces the bottom wall 22 with a gap therebetween. The power receiving pin 23 is located within the inner cylinder 31, and a power feeding pin 41 whose upper end is caulked and connected to the power feeding line 4 is electrically connected to the power receiving pin 23. A locking projection 312 is formed at the upper end of the outer peripheral surface of the inner cylinder 31, and a waterproof rubber cover 33 is locked and fixed to the projection 312.

The rubber cover 33 is a bag with a closed end provided with a hole 331 through which the power receiving pin 23 is inserted, and its upper opening edge is locked and fixed to the protrusion 312 to cover the entire outer circumference of the inner cylinder 31 and inside the cylinder wall 21. It is pressed against the periphery to prevent rainwater from entering. The end surface of the rubber cover 33 is on the bottom wall 22,
The bottom wall 22 and the cylinder end 311 of the inner cylinder 31 are interposed in pressure contact with each other.

The operating vibration of the fuel injection valve reaches the power receiving connector 2 and causes its bottom wall 22 to vibrate. Here, according to the fuel injection valve having the above structure, the vibration of the bottom wall 22 is suppressed and attenuated by the rubber cover 33 that is in pressure contact with the bottom wall 22, and the emission of operating noise from the bottom wall 22 is prevented.

FIG. 2 shows another embodiment of the invention. In the figure, the rubber cover 33 has a lip portion 3 extending outward around the entire circumference of the upper end.
32 is formed, and the lip portion 332 is interposed in pressure contact between the upper end portion of the cylinder wall 21 and the lower surface of the outer cylinder 32 of the power supply connector 3.

According to this structure, noise radiation from the power receiving connector 2 can be further effectively reduced.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a connector portion of a fuel injection valve showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a connector portion of a fuel injection valve showing a further embodiment of the invention, and FIG. The figure is an overall side view of the fuel injection valve. 1...Housing 11...Solenoid valve 12...Needle valve 13...
・Injection nozzle 2...Power receiving connector 21...
... Cylinder wall 22 ... Bottom wall 23 ...
...Power receiving pin 3...Power supply connector 31
...Inner cylinder 311 ...Cylinder end 32
...Outer tube 33...Waterproof rubber cover (
Waterproof rubber body) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] This is an electromagnetic fuel injection valve that uses an electromagnetic coil built into a cylindrical housing to attract a needle valve to open a fuel injection nozzle at the tip of the housing, and has a power receiving pin electrically connected to the electromagnetic coil erected in the center of the bottom wall. A cylindrical power receiving connector with a bottom is provided, and a power feeding connector connected to the power receiving connector is provided, and the power feeding connector is brought into contact with the inner circumference of the cylinder of the power receiving connector via a waterproof rubber body covering the outer periphery. In an electromagnetic fuel injection valve comprising an inner cylinder and an outer cylinder that abuts the outer periphery of the cylinder of the power receiving connector, the waterproof rubber body is extended onto the bottom wall of the power receiving connector, and the inner cylinder is An electromagnetic fuel injection valve characterized by being interposed between the cylinder end and the cylinder end.