JPH0442520Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a fuel injection valve.

[Prior Art] As a conventional fuel injection valve, one shown in FIG. 2, for example, is known.

This is to control the flow rate of fuel flowing between the valve body A and the valve seat C by causing the valve body A to attract and release according to the electromagnetic force generated in the coil B, thereby controlling the amount of fuel injected from the nozzle hole D. be.

Power is supplied to the coil B through terminals F and G, which are symmetrically provided at positions offset from the center of the housing E.

[Problems to be solved by the invention] However, in such a fuel injection valve,
Housing E made of metal to prevent short circuit between terminals F and G and leakage of injected fuel.
It was necessary to load insulating filling members J and K and O-rings L and M into terminal holes H and I, respectively, which were bored in the terminal holes H and I, respectively.

Therefore, the number of parts is large, and an increase in cost is unavoidable.

An object of the present invention is to provide a fuel injection valve that can solve the problems of the conventional fuel injection valve, reduce the number of parts, reduce cost, and improve airtightness.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fuel injection valve in which fuel injection is controlled by causing a valve body to perform suction and release operations in response to electromagnetic force generated in a coil. A cylindrical housing having a through hole and a coil storage space in the center, a cylindrical connector member attached to the through hole and into which a rod for adjusting the return spring of the valve body is fitted; is arranged in the coil storage space around the cylindrical connector member, and a terminal rod is provided insulatingly to supply power to the coil at a position offset from the center of the cylindrical housing; The return spring adjusting rod is electrically connected to the return spring adjusting rod through a cylindrical connector member.

[Function] According to the present invention, a coil is arranged in the coil storage space of the cylindrical housing, and a terminal rod provided insulated at a position offset from the center of the cylindrical housing is connected to the coil, and a terminal rod is provided at a position offset from the center of the cylindrical housing. Electric power is supplied using a return spring adjustment rod that is fitted into at least the inside of the cylindrical connector member that is mounted in the through hole of the cylindrical connector member.

Therefore, only one terminal hole needs to be provided in the cylindrical housing, and only one insulating filling member, O-ring, etc., which were required in the past, are required, resulting in cost reduction and improved airtightness. .

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view of a fuel injection valve according to an embodiment of the present invention.

In the figure, 10 is a metal cylindrical housing having a through hole 10A and a coil storage space 10B in the center, first and second annular grooves 10C and 10D on the outer periphery, and a coil storage space 10.
A fuel passage 10E is provided in the radial direction to communicate with the second annular groove 10D, and a terminal hole 10F is provided in the axial direction at a position offset from the center.

Reference numeral 15 denotes a metallic cylindrical connector member mounted in the through hole 10A, into which a brass return spring adjusting rod 20 is fitted. A protrusion 20A for preventing the return spring 25 from falling down is formed at one end of the rod 20, two annular grooves 20B and 20C are formed at the midsection, and a plurality of filaments 20D for caulking are formed at the other end. A cover terminal 20E made of phosphor bronze is also provided at the other end.

30 is the housing 1 around the connector member 15;
This is a resin bobbin arranged in the coil storage space 10B of No. 0, and the coil 32 is wound around it.

A valve seat body holder 40 is fixed to the cylindrical housing 10 by caulking, and holds a valve seat body 44 having a nozzle 42 in the center thereof.

Reference numeral 46 denotes a hemispherical valve body to which a magnetic anchor plate 48 is integrally fixed, and is biased in the direction of seating on the valve seat body 44 by the aforementioned return spring 25.

50 is a leaf spring that applies a biasing force to the valve body 46 in a direction opposite to the biasing force of the return spring 25, and 52 is a shim for adjusting the spacing.

Further, in the terminal hole 10F of the cylindrical housing 10, a terminal rod 5 made of phosphor bronze is inserted through the bobbin 30 and electrically connected to one end of the coil 32.
A sealing O-ring 56 and a resin insulating filling member 58 are arranged around the terminal rod 54. terminal rod 54
The end of the cover terminal 6 is also made of phosphor bronze.
0 is overturned.

On the other hand, the coil storage space 1 of the cylindrical housing 10
A hole 10G is provided on the top surface of 0B, and this hole 10
A terminal rod 62 made of phosphor bronze, one end of which is inserted into the bobbin 30 and electrically connected to the other end of the coil 32, is inserted into G for electrical continuity. Note that 64 is a filter provided in the body of the cylindrical housing 10, and 66 is a mold after the fuel injection valve is assembled.

The fuel injection valve having the above structure is suitable for use as a so-called single point injector (SPI), which is provided one at an intake manifold collection part of an engine.

And a coil 32 for controlling the fuel injection.
Power is supplied to the coil 32 via the cover terminal 60 and the terminal rod 54, and then to the terminal rod 62 and the cylindrical housing 1.
0, the connector member 15, the return spring adjustment rod 20, and the cover terminal 20E are connected in this order and grounded.

Therefore, when the coil 32 is energized, the valve body 46
is the connector member 15 together with the anchor plate 48.
The fuel is sucked in and separated from the valve seat body 44, and the fuel controlled to a predetermined pressure is injected from the nozzle 42.

On the other hand, when the coil 32 is demagnetized, the valve body 46 is returned to its seat by the return spring 25, and fuel injection is stopped.

In the above embodiment, the terminal rod 62 is inserted into the hole 10G of the cylindrical housing 10 to establish electrical continuity with the connector member 15 through the cylindrical housing 10.
Alternatively, the terminal rod may be brought into direct contact with the connector member 15.

Furthermore, when the fuel injection valve according to the present invention is assembled into a throttle body and used, it goes without saying that the metal part of the fuel injection valve should not come into contact with the metal parts of other members.

[Effects of the invention] As is clear from the above explanation, according to the invention, the number of parts is reduced because the processing of terminal holes in the cylindrical housing, O-rings, and some of the insulating filling members that were required in the past are no longer necessary. This reduces the cost and improves sealing performance.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view showing a conventional example. 10... Cylindrical housing, 10A... Through hole, 10B... Coil storage space, 10F... Terminal hole, 15... Connector member, 20... Return spring adjustment rod, 20E... Cover terminal, 25... Return spring, 32... Coil, 44... Valve seat body, 46... Valve body, 60...
cover terminal.

Claims (1)

[Scope of Claim for Utility Model Registration] A fuel injection valve that controls fuel injection by causing a valve body to perform suction and release operations in response to electromagnetic force generated in a coil, and a cylinder having a through hole and a coil storage space in the center. a cylindrical connector member that is attached to the through hole and into which a rod for adjusting the return spring of the valve body is fitted; and the coil is inserted into the coil storage space around the cylindrical connector member. and the power supply to the coil is connected to the return spring adjustment rod through at least a terminal rod provided insulated at a position offset from the center of the cylindrical housing, and at least the cylindrical connector member. A fuel injection valve characterized in that it is electrically conductive as in the case of using a fuel injection valve.