JPS6032735Y2 - oil immersion solenoid - Google Patents

Description

[Detailed description of the invention] The present invention is an oil-immersed solenoid that increases suction force by forming a plurality of tapered parts on the mutually suction surfaces of a fixed core and a plunger. Regarding.

Conventional oil-immersed solenoid (hereinafter simply referred to as Tsuremade)
Now, in order to increase the suction force of the fixed core and plunger,
As shown in FIG.
and 15 relative clearance Sl is decreased, and the suction force is increased.

If this taper angle θ12 is decreased, the relative clearance Sl
is 1, relationship with axial clearance t 51 = t1 sin θ1
2, it decreases, but the axial length 11 of a part of the taper becomes thicker.

On the other hand, this taper part must be such that it does not come into contact even when the plunger 5 is attracted to the fixed iron core 3 (the state in which the plunger 5 is moved to the leftmost position in FIG. 1).

The reason for this is that in the case of contact, as shown in the attraction force curve C shown in FIG. 5, if contact begins at point P in the figure, the attraction force decreases rapidly.

Therefore, when machining a part of the taper, point E (
The lowest point of taper part 13° 15) As a reference, taper part 13 has a taper of, for example, θ/2+10°, θ12-0°
, the taper part 15 has a taper of θ/2+0', θ/2
Therefore, when the length 11 of the taper part is large, the gap between the plunger and the fixed iron core becomes large near the outer periphery of the plunger, and the average relative clearance Sl of the taper part increases. , it becomes impossible to increase the suction force.

In other words, in the conventional solenoid, if the taper angle θ12 is made small in order to increase the suction force, a gap is created due to machining of a part of the taper to avoid contact between the two tapers, and the suction force cannot be increased. .

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an oil-immersed solenoid which increases the suction force while keeping the processing method similar to the conventional method, while also resulting in material savings.

A feature of the solenoid according to the present invention is that a plurality of tapered portions are formed on the opposing electromagnetic attraction surfaces of the fixed core and the plunger to increase the attraction force.

In FIG. 2, 1 is a solenoid according to the present invention, 2 is a plunger guide made of a tube, 3 is a fixed iron core that is fitted and fixed to one end of the plunger guide, and 4 is a stopper that is fitted and fixed to the other end of the plunger guide. , 5 is a plunger movably inserted into the plunger guide 2, 6 is a winding provided around the plunger guide 2, 7 is a yoke that surrounds a part of the winding to form a magnetic path, and 8 is fixed. This is a bushing rod that is inserted within the same axial direction of the iron core 3 and transmits the operation of the plunger 5 to, for example, a valve body.

As shown in detail in FIG. 3, two tapered portions 23.23 and 25.35 are formed on the opposing end surfaces of the fixed core 3 and the plunger 5, respectively, and the cross section has a single-step bent shape. It shows.

As shown in the figure, the taper angle θ1 of the tapered portions 23, 23
2. The taper angle γ12 of the tapered portion 33.35 may or may not be equal to θ and γ due to the attraction force.

An insert 9 is attached to either or both of the fixed core 3 and the plunger 5 in order to prevent the fixed core 3 and the plunger 5 from coming into contact with each other.

In the embodiment shown in FIG. 4, three tapered portions are formed on the opposing end surfaces of the fixed iron core 3 and the plunger 5, and the taper angle of each taper portion is equal to that of the two taper portions. As with the case, there are cases where they are equal and cases where they are not equal depending on the attraction force.

It is also possible to have four or more tapered portions.

As is clear from the above explanation, in the case of the solenoid according to the present invention, when the taper part shown in FIG. This becomes approximately half of the axial length l□, and therefore the relative gap S2 can be approximately halved to Sl.

As a result, as shown in FIG. 5, which shows an example of the relationship between the suction stroke of the solenoid, the suction force (curve B) of the solenoid having a single-step (double) taper portion
is the suction force of a solenoid with a single taper section (curve A
) is larger in the range of stroke used.

Furthermore, as is clear from FIGS. 1 and 3, the fixed core 3
and the length of the plunger 5 is the difference in length of the tapered part f, -
/2, resulting in material savings.

From various actual measurement results, the taper partial axial length f2 in FIG. 3 ranges from 0.8 times to 2. It is effective to take it up to N.

As another means for forming a gap between the fixed core and the plunger, as shown in FIG.
A flanged insert 5a may be inserted and fixed therein, and a gap may be formed by the flange 5b.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the oil-immersed solenoid according to the present invention, Figure 2
The figures are an enlarged view of a part of Fig. 1, Fig. 3 is an enlarged sectional view of a part of a conventional solenoid that does not implement the present invention, and Fig. 4 is an enlarged sectional view of a part of another embodiment. FIG. 5 is a diagram showing an actual measurement example of the suction car stroke relationship of the oil-immersed bridge solenoid, and FIG. 6 is a diagram showing a modification of the plunger. 1: Oil-immersed solenoid, 2 Ni lunge gear guide, 3: Fixed iron core, 4: Stopper, 5 Ni lunge gear, 6: Winding wire, 7
: Yoke, 8: Push rod, 13, 23, 33: Fixed core taper part, 15. 25, 35 nib plunger part, A: Single taper suction force curve, B: Double taper suction force curve.

Claims (1)

[Scope of utility model registration request] a winding; a fixed core fitted and fixed within the winding; a plunger movably inserted into the winding; In an oil-immersed solenoid having a bushing rod that conveys the power to An oil-immersed solenoid characterized in that the distance is 0.8 to 2.5 times the stroke of the solenoid.