JP3593704B2 - Low noise solenoid - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a low-noise solenoid, and more particularly to a technique for improving characteristics, durability, and reliability while suppressing an impact sound during operation.
[0002]
[Prior art]
Conventionally, in a solenoid for moving a movable iron core 2 toward a fixed iron core 3 in accordance with excitation of a coil 1, as shown in FIG. 3, a fixed iron core 3a is provided with a cushion layer 8a to move the movable iron core 3a. In this case, the impact sound when the vehicle 2 collides is suppressed. However, in such a configuration, a gap is generated by the cushion layer 8a, and accordingly, the magnetic resistance increases, and the attraction force and the attraction force decrease.
[0003]
In order to solve such a problem, it is conceivable to interpose the cushion layer 8b between the fixed iron core 3b and the magnetic body frame 4 as shown in FIG. There is no surface contact between the core 3b and the magnetic body frame 4 and the surface contact state between the fixed iron core 3b and the magnetic body frame 4 cannot be enhanced even at the joint thereof, so that the magnetic resistance increases. There was a problem to do.
[0004]
Further, as shown in FIG. 5, a configuration is also conceivable in which a magnetic body 3d is integrated with the fixed iron core 3c to improve the connection with the magnetic body frame 4 and the surface contact state with the magnetic body 3d. Is to attach the support frame 4a to the back of the cushion layer 8c interposed on the back of the magnetic body 3d. However, in such a configuration, the magnetic body 3d and the support frame 4a protrude outside the magnetic body frame 4, and there is a problem that the space is increased accordingly. Therefore, in order not to increase the space, it is necessary to reduce the size of the coil 1 and the like on the main body side, and there is a problem that the capacity of the solenoid is greatly reduced.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to solve such a problem. An object of the present invention is to make a fixed iron core and a magnetic body frame sufficiently contact with each other while suppressing an impact force and an impact sound , thereby reducing a magnetic resistance. To provide a low-noise solenoid that can secure sufficient suction force and suction force of the movable iron core by avoiding an increase in the size, and that can improve characteristics, durability, and reliability without reducing the coil space, etc. To be.
[0006]
[Means for Solving the Problems]
The present invention relates to a solenoid for moving the movable iron core 2 toward the fixed iron core 3 in accordance with the excitation of the coil 1, wherein the fixed iron core 3 has a penetrating portion 6 penetrating the magnetic body frame 4, A step portion 5 having a diameter larger than that of the fixed iron core 3 is formed, and a separate auxiliary iron core 9 is formed around the fixed iron core 3. The step 5 of the core 3 is in surface contact with the magnetic frame 4 to fix the fixed iron core 3 to the magnetic frame 4, and a cushion layer 8 is interposed between the lower surface of the auxiliary iron core 9 and the magnetic frame 4. It is characterized by being formed.
[0008]
[Action]
The cushion layer 8 interposed between the auxiliary iron core 9 and the magnetic body frame 4 absorbs the shock during the operation of the movable iron core 2 to reduce noise and improve durability. The step 5 of the fixed iron core 3 is in surface contact with the magnetic frame 4 to avoid an increase in magnetic resistance. In addition, since the stepped portion 5 of the fixed iron core 3 is brought into surface contact with the magnetic frame 4, no other magnetic material is projected outside the magnetic frame 4. An increase in size due to such a configuration is avoided. In order to avoid an increase in size, the coil 1 and the like are not made small to reduce the capacity. Thus, the characteristics, durability and reliability of conventional solenoids are improved.
[0009]
Further, on the peripheral portion of the fixed iron core 3 auxiliary iron core 9 are formed separately, avoiding complicated machining of the fixed iron core 3.
[0010]
【Example】
FIG. 1 is a sectional view showing a solenoid A that moves a movable iron core 2 toward a fixed iron core 3 in accordance with excitation of the coil 1. In such solenoid A, auxiliary iron core 9 on the peripheral portion of the fixed iron core 3 (auxiliary magnetic pole) is formed separately, the auxiliary iron core 9 is inserted into the fixed core 3. The fixed iron core 3 penetrates and fixes the magnetic body frame 4, and the end of the penetrating portion 6 is swaged to increase the diameter. In addition, a step portion 5 having a diameter larger than that of the penetrating portion 6 is formed. The step 5 is in surface contact with the magnetic frame 4. A step portion 10 having a larger diameter than the step portion 5 is formed. The lower end flange portion 11 of the auxiliary iron core 9 enters the step portion 10, and the large-diameter step portion 7 is formed on the lower surface of the auxiliary iron core 9. A cushion layer 8 is interposed between the large diameter step 7 and the magnetic frame 4.
[0011]
As described above, the operation of the movable iron core 2 in which the movable iron core 2 collides with the auxiliary iron core 9 by the cushion layer 8 interposed between the large-diameter stepped portion 7 of the fixed iron core 3 and the magnetic body frame 4. to absorb the low noise of the impact when, and while increasing the durability, the stepped portion 5 of the fixed iron core 3 is in surface contact with the magnetic body frame 4, it can avoid an increase in magnetic resistance, moreover, the fixed core Since the magnetic material 3 is brought into surface contact with the magnetic material frame 4, another magnetic material does not protrude outside the magnetic material frame 4. In order to avoid this, the capacity is not reduced by reducing the size of the coil 1 and the like, but the characteristics, durability and reliability are improved in the conventional solenoid.
[0012]
Then, the peripheral portion of the fixed iron core 3 auxiliary iron core 9 are formed separately, it is to avoid complicated processing of the fixed iron core 3. In such a case, as shown in FIG. 2, the auxiliary iron core 9 may be cylindrical, and a cushion layer 8 such as an O-ring may be interposed between the auxiliary iron core 9 and the magnetic body frame 4. is there. The auxiliary iron core 9 is locked on a locking step of the coil bobbin 12.
[0014]
【The invention's effect】
As described above, the present invention forms a penetrating portion penetrating the magnetic body frame in the fixed iron core and a step portion having a larger diameter than the penetrating portion, and forms a separate auxiliary iron core around the fixed iron core. The fixed iron core penetrates through the magnetic body frame, the stepped part of the fixed iron core comes into surface contact with the magnetic body frame, and the fixed iron core is fixed to the magnetic body frame. Since the cushion layer is interposed between the frame and the auxiliary iron core and the magnetic material frame, the cushion layer interposed between the auxiliary iron core and the magnetic material frame absorbs the shock at the time of operation of the movable iron core to reduce noise, While increasing the durability, the stepped portion of the fixed iron core comes into surface contact with the magnetic body frame to avoid a decrease in magnetic resistance. In addition, other magnetic materials are used to bring the fixed iron core into surface contact with the magnetic body frame. Does not protrude out of the magnetic frame, and due to this configuration, To reduce the size of the coil, etc. in order to avoid oversizing and reduce the size of the coil, thus improving the characteristics, durability and reliability of the conventional solenoid. There are advantages.
[0015]
Further, on the peripheral portion of the fixed core are formed auxiliary iron core is separately, since the cushion layer is interposed between the lower end surface and the magnetic frame of the auxiliary iron core, complex fixed iron core There is an advantage that processing can be avoided.
[Brief description of the drawings]
FIGS. 1A and 1B show an embodiment of the present invention, wherein FIG. 1A is a sectional view and FIG. 1B is a partial sectional view.
FIGS. 2A and 2B show another embodiment of the above, wherein FIG. 2A is a sectional view and FIG. 2B is a partially enlarged sectional view.
FIG. 3 is a sectional view of a conventional example.
FIG. 4 is a sectional view of another conventional example.
FIG. 5 is a sectional view of still another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coil 2 Movable iron core 3 Fixed iron core 4 Magnetic frame 5 Step part 6 Penetration part 7 Large diameter step part 8 Cushion layer 9 Auxiliary iron core

Claims (1)

A solenoid that moves the movable iron core toward the fixed iron core along with the excitation of the coil.The fixed iron core has a penetrating portion that penetrates the magnetic body frame, and a step portion having a larger diameter than the penetrating portion. A separate auxiliary iron core is formed around the fixed iron core, the penetrating portion of the fixed iron core penetrates the magnetic frame, and the stepped portion of the fixed iron core comes into surface contact with the magnetic frame to form the magnetic frame. A low-noise solenoid , wherein a fixed iron core is fixed, and a cushion layer is interposed between a lower surface of the auxiliary iron core and the magnetic frame .

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