INJECTOR

Abstract

An electromagnetically-driven injector may include a valve body of an on-off valve biased in a valve-closed direction by a coil spring, which is arranged in a stroking direction of the valve body, and at least one plate spring, which is provided at a right angle in the stroking direction of the valve body and arranged in such a manner as to support the valve body, and keeps a valve-closed state when energization is not provided. The at least one plate spring may include a plurality of plate springs arranged in the stroking direction of the valve body.

Claims

1. An electromagnetically-driven injector comprising a valve body of an on-off valve biased in a valve-closed direction by a coil spring, which is arranged in a stroking direction of the valve body, and at least one plate spring, which is provided at a right angle in the stroking direction of the valve body and arranged in such a manner as to support the valve body, and keeps a valve-closed state when energization is not provided; wherein the at least one plate spring includes a plurality of plate springs arranged in the stroking direction of the valve body.

2. The injector according to claim 1, wherein the plurality of plate springs are arranged at a predetermined distance from each other in the stroking direction of the valve body.

3. The injector according to claim 1, wherein a number of the plurality of plate springs is two.

4. The injector according to claim 2, wherein a number of the plurality of plate springs is two.

Description

BRIEF DESCRIPTION OF DRAWING

[0013] FIG. 1 is a vertical partial sectional view illustrating a valve-closed state of an injector in an embodiment in the present invention.

DETAILED DESCRIPTION

[0014] In the following, a preferred embodiment of the present invention will be described in detail with reference to the drawing.

[0015] FIG. 1 is a view illustrating an outline of a vertical sectional part centering on an on-off valve 2, which includes a valve body 21 and a valve seated seat 22, of an electromagnetically-driven injector 1 that is a preferred embodiment of the present invention and that supplies fuel to a gas engine. The injector 1 includes an electromagnetic coil 3, a lower plate 4, and a movable iron core 5. On a lower side (downstream side) of the movable iron core 5, the valve body 21 including a valve rubber 211 at a leading end is arranged. The movable iron core 5 and the valve body 21 are supported in a floating state by a pair of thin disk-shaped plate springs 6 and 6 arranged at a right angle in a valve stroking direction.

[0016] Then, each plate spring 6 includes a predetermined-shaped open part to let fuel pass through, a peripheral part thereof being fixed to a side of a main body 9 that forms a nozzle 91, and a central part thereof being displaced back and forth vertically by elastic deformation while supporting the movable iron core 5 on an upper side (upstream side) and supporting the valve body 21 on a lower side (downstream side). The plate spring 6 is pushed in a lower direction by a load of a coil spring 7, and the valve rubber 211 of the valve body 21 tightly contacts with a sealing surface 221 of the valve seated seat 22 and becomes a valve-closed state.

[0017] Note that in the present embodiment, the plate springs 6 and 6 are supported by being provided across the main body 9 and the valve body 21, which moves along with the movable iron core 5, with an inner periphery thereof being fixed to a hollow cylinder-shaped inner collar 8 arranged between the movable iron core 5 and the valve body 21, and an outer periphery thereof being fixed to a hollow cylinder-shaped outer collar 10 arranged between the main body 9 and the lower plate 4, and are arranged side by side at a predetermined distance from each other at a right angle in a valve stroking direction.

[0018] Also, similarly to the related art, the coil spring 7 is provided in the valve stroking direction on an upper side of the valve body 21 and is arranged in a state of being compressed vertically to bias the valve body 21 of the on-off valve 2 in a valve-closed direction.

[0019] Note that in the drawing, a reference sign 51 is a stopper rubber that is arranged on an upstream side of the movable iron core 5 and that is included to absorb impact of when the movable iron core 5 hits a bottom part of a fixed iron core 11 when the movable iron core 5 (valve body 21) is raised in opening of the valve.

[0020] Similarly to this kind of injector in the related art, the present embodiment having the above configuration sucks the movable iron core 5 by energizing and exciting the electromagnetic coil 3 and opens the on-off valve 2 against biasing force of the coil spring 7 and the plate springs 6 and 6. However, in the present embodiment, the valve body 21 is supported by the plurality of (two) plate springs 6 and 6 arranged at a predetermined distance.

[0021] Thus, unlike the plate spring structure in the related art in which structure one plate spring that supports a valve body only at one point of a central part is used, a valve body is supported by two plate springs 6 and 6 arranged at a predetermined distance. Thus, actuation does not become unstable due to various kinds of disturbance, the valve rubber 211 (or stopper rubber 51) is not worn unevenly when the valve is opened/closed, a displacement amount of the valve body 21 is not increased, and a stress applied to the plate springs 6 and 6 is not increased, whereby a situation that a function of the injector 1 is damaged does not occur.

[0022] In particular, in the present embodiment, an inner periphery 61 and an outer periphery 62 of each of the plate springs 6 and 6 are fixed to predetermined positions via the inner collar 8 and the outer collar 10. Thus, the plate springs 6 and 6 are securely supported in predetermined positions at a predetermined distance from each other at a right angle in the valve stroking direction, whereby spring actuation is secure, assembling is easy, and production can be performed quickly.

[0023] Note that in the present embodiment, the two plate springs 6 and 6 are used for reduction of the number of parts and simplification of a configuration. However, it is only necessary that there is a plurality of plate springs, and selection and utilization are performed arbitrarily depending on capacity of an employed injector 1, and a material, thickness, and the like of plate springs 6 and 6.