JPH0733123Y2 - Measuring tool for valve for fuel injection valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a measuring jig for a valve for a fuel injection valve having a flat movable element and a hemispherical valve body.

<Prior Art> In an internal combustion engine, a fuel injection valve as shown in, for example, FIG. 3 is used when fuel injection is performed in a collection portion of intake passages.

That is, the valve seat 4 is fixed to the main body 2 of the fuel injection valve 1 via the housing 3, and the flat movable element 6 is provided on the upstream side of the valve seat 4.
A valve 5 with a hemispherical valve body 7 attached to the front surface of the central part of the
Is arranged, and the disc spring 8 acts on the convex portion 6a on the front surface of the flat movable element 6 to center the valve element 7, and the valve body 7 is biased by the spring 9 to be seated (closed) on the valve seat 4 and held. There is. Then, by energizing the electromagnetic coil 10, the flat movable element 6 is attracted and moved upward in the drawing against the spring 9 until the rear surface 6b contacts the main body 2, and the valve body 7 is floated from the valve seat 4. It is designed to be opened (valve opening)
-78276 publication).

By the way, in such a fuel injection valve, the valve 5, that is, the assembly of the flat movable element 6 and the valve body 7 has the convex portion 6a.
The parallelism and flatness of the rear surface 6b are extremely important in terms of performance such as flow rate variations, and are inspected at a high sampling rate in the manufacturing process.

<Problems to be solved by the invention> However, when measuring the flatness of the rear surface 6b, a measurement stylus (electromagnetic pickup type surface roughness meter) 15 is used as shown in FIG. Since the valve body 7 is attached, it has been conventionally fixed by using an adhesive or clay, which is not practical, and the measurement error is large, and the flatness cannot be accurately measured. There was a problem.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a measuring jig capable of securely and easily fixing a valve for measuring the valve.

<Means for Solving the Problems> Therefore, according to the present invention, the pedestal having the upper surface as the reference plane for press-contacting the convex portion of the flat movable element and the opening formed with the tapered hole, and the pedestal inserted into the hole. A resin-made cylindrical chuck having a taper corresponding to the taper on the outer circumference and a receiving portion for receiving the valve element on the inner circumference and having a slot, and a screw for pulling the chuck into the hole It is a component.

<Operation> In the above structure, when the valve body of the valve is put into the receiving portion of the chuck and the chuck is pulled into the hole by the screw, the taper action reduces the diameter of the chuck with the slide and grips the valve body. You can pull this in. As a result, the convex portion of the flat mover is pressed against the reference plane and is securely fixed in this state.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The pedestal 21 of the measurement jig 20 has an upper surface serving as a reference plane 22 and a hole 23 provided in the center thereof. A taper 24 is attached to the opening of the hole 23.

The chuck 25 is made of a fluororesin (Teflon) in a cylindrical shape and is inserted into the hole 23. The chuck 25 has a taper 26 corresponding to the taper 24 on the outer circumference, and a tapered receiving portion 27 for receiving the valve body 7 of the valve 5 on the inner circumference of the upper portion. Also chuck
On the upper part of 25, there are formed slits 28 at four places.

Further, a nut 29 is embedded in the lower inner periphery of the chuck 25, and a screw 30 is screwed into the nut 29 from the bottom of the pedestal 21. The head 31 of this screw 30 has the same diameter as the pedestal 21, and the pedestal 21
Forms the bottom of.

When using the measurement jig 20 having such a configuration, the valve 5 is placed on the pedestal 20 with the screw 30 loosened, and the valve element 7 is put into the receiving portion 27 of the chuck 25.

Then, by turning the head 31 and tightening the screw 30, the chuck 25 is pulled into the hole 23. Then taper 24 and taper
By the action with 26, the diameter of the upper part of the chuck 25 with the slit 28 is reduced, and the valve body 7 of the valve 5 is gripped by the chuck 25. At this time, since the chuck 25 is made of resin, it is not scratched. Then, since the chuck 25 is gradually moved downward, the valve 5 is retracted while holding the valve body 7, and the convex portion 6a of the flat movable element 5 is brought into pressure contact with the reference plane 22.
It is fixed in this state.

After that, the parallelism or surface roughness of the rear surface 6b with respect to the reference plane 22 may be measured using a measuring stylus or the like.

<Effects of the Invention> As described above, according to the present invention, the parallelism and the flatness or the surface roughness of the rear surface of the flat movable element in the fuel injection valve having the flat movable element and the hemispherical valve body can be improved. During measurement, the valve body is securely fixed with a resin chuck without damaging it, and the convex portion on the front surface of the flat-shaped mover is pressed against the reference plane to bring it closer to the usage state of the flat-shaped mover and achieve parallelism. Also, since flatness or surface roughness can be measured, it is possible to measure without error in the measurement in the unit of several microns, so not only can the number of man-hours for measurement work be greatly reduced, but accurate measurement is also possible. The effect of becoming is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a measuring jig showing an embodiment of the present invention, FIG. 2 is a perspective view of a chuck in the same embodiment, FIG. 3 is a sectional view of a fuel injection valve, and FIG. 4 is an enlarged view of the valve. It is a figure. 5 ... Valve, 6 ... Flat mover, 6a ... Projection, 6b ...
Rear, 7 ... Valve, 20 ... Measuring jig, 21 ... Pedestal, 22 ...
… Reference plane, 23 …… Hole, 24 …… Taper, 25 …… Chuck, 26 …… Taper, 27 …… Receiving part, 28 …… Sliding, 30…
…screw

Claims (1)

[Scope of utility model registration request] 1. A hemispherical valve element is attached to the front surface of the central portion of a flat mover, and a disc spring acts on the convex portion of the front surface of the flat mover to center it, and the rear surface of the flat mover at the time of valve lift. A valve jig for a fuel injection valve that regulates the lift amount by means of a pedestal having a tapered hole in the opening, the upper surface of which is used as a reference plane for press-contacting the convex portion of the flat mover, and the hole A resin-made cylindrical chuck having a taper corresponding to the taper on the outer periphery and a receiving portion for receiving the valve element on the inner periphery and having a slot, and a screw for drawing this check into the hole. A jig for measuring a valve for a fuel injection valve, comprising: retracting the chuck by retracting the valve body, and retracting the valve body to press the convex portion of the flat movable element into pressure contact with a reference plane to fix it.