JPH039295Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a solenoid.
This invention relates to a solenoid suitable for pressing a target member during rotational movement.

(Prior art) As an output control means for an automobile engine, the third
As shown in the figure, a spool valve 11 slidably inserted into the end of a camshaft 10 is moved by a solenoid 1 disposed laterally, and a control pressure fluid is supplied via the spool valve 11. A control device is used in which the power is supplied to a control section that does not operate.

In the solenoid 1, a coil 3 formed in a substantially cylindrical shape is installed in a case 2, and a movable core 4 biased by a spring 5 is disposed so as to be movable in the axial direction inside the coil 3. A push rod 6, which is made of a non-magnetic material and presses against the solenoid valve 11, is disposed at the front end.

The tip of the push rod 6 is connected to the camshaft 10.
Since the spool valve 11 is built into the camshaft 10 and rotates with the camshaft 10, the spool valve 11 is formed into a substantially spherical surface as shown in FIG. surface treatment has been applied.

(Problems to be solved by the invention) In the above-mentioned solenoid, since the push rod 6 is required to be non-magnetic, high hardness cannot be expected, and the tip is subjected to surface treatment such as ion nitriding. Even after processing, the hardness cannot be improved.
On the other hand, a gap is maintained between the push rod 6 and the spool valve 11 when the solenoid is not OFF, and a collision occurs between the two parts when the solenoid is ON, so the tip of the push rod 6 Also, since the spool valve 11 is rotating at high speed together with the camshaft 10, if even a slight sag occurs at the end of the push rod 6 and a surface contact is formed between the two members 6 and 11, Since rotation on the camshaft 10 side is transmitted to the push rod and rotational force is also applied to the spring 5, it is necessary to take special measures to prevent the rotation of the spring 5.

The object of the present invention is to provide a solenoid structure suitable for pressing the target member during the above-mentioned rotational movement.

(Means for Solving the Problems) In view of the problems with the conventional solenoids described above, the present invention provides a spherical concave at the tip of the push rod, which is disposed in front of the movable core that moves in the axial direction within the solenoid. A steel ball treated to have high hardness is rotatably inserted into the spherical recess.

(Function) In the solenoid of the present invention having the above configuration, when a collision occurs between the push rod and the spool valve due to ON operation, the high hardness steel ball attached to the tip of the push rod The push rod made of a highly magnetic material is prevented from directly colliding with the spool valve, and the spherical contact between the steel ball and the spool valve end keeps the contact area to a minimum.

(Example) In the embodiment shown in Fig. 1, the case 2, coil 3, movable core 4, and spring 5 that constitute the solenoid 1 are made of non-magnetic material and have the same structure as those shown in Fig. 3 described above. As shown in detail in FIG. 2, a spherical recess is formed at the tip of the push rod 6, which is made of a metal material, and a steel ball 7 treated to be highly hard can be rotated within the recess. is inserted into.

(Effects of the invention) As mentioned above, the solenoid of the invention is placed at the tip of the movable iron core, and a steel ball treated with high hardness is attached to the tip of the push rod that presses the spool valve when the coil is turned on. By having a structure in which the steel ball is rotatably inserted, the steel ball does not become stiff due to repeated collisions between the push rod and the spool valve, and therefore the contact surface between the steel ball and the end face of the spool valve is Since the diameter is kept to a minimum, there is no risk of rotation of the push rod and movable core biasing spring found in prior art solenoids, and the solenoid maintains its normal function over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a partially detailed view of the same embodiment, FIG. 3 is a sectional view of an example of a solenoid according to the prior art, and FIG. 4 is a sectional view of the same example. FIG. 3 is a partially detailed view of an example. 1...Solenoid, 2...Case, 3...Coil, 4...Movable iron core, 5...Spring, 6...
Push rod, 7... steel ball, 10... camshaft, 11... spool valve.

Claims (1)

[Scope of utility model registration request] A coil 3 formed into a substantially cylindrical shape, the coil 3
A solenoid has a movable core 4 disposed so as to be movable in the axial direction, a spring 5 that biases the movable core 4, and a push rod 6 pushed by the movable core 4. A steel ball 7 is attached to the tip of the push rod 6. A solenoid characterized by being rotatably buried.