JPH0356012Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to solenoids.

(Prior Art) In general, when a solenoid is sucking a plunger, the collision sound of the plunger colliding with a fixed iron core is loud, and especially when used in a device used at home, such as a fully automatic washing machine, the collision noise is unpleasant to the ears. , its reduction is desired. Conventionally, in order to reduce this collision noise, for example,
As in No. 52649, a piston rod is provided at the tip of the movable core of the solenoid and passes through the bottom of the fixed core, and the piston ring of a direct-acting air damper attached to the outside of the bottom of the fixed core is fixed to the piston rod. Proposed.

(Problem to be solved by the invention) However, in the conventional configuration described above, the air damper is large and is installed in series on the bottom side of the fixed core, so the total length of the solenoid is approximately 100% longer than that without an air damper. Since the size is about twice as large, a large installation space is required, which is not preferable. Furthermore, since the braking force of the air damper is applied to the tip of the thin piston rod, which is an extension of the movable core, in a manner that opposes the suction force acting on the movable core, the movable core tends to vibrate from side to side during braking. There were problems in that the bobbin, which the movable iron core slid into contact with, was often worn out.

This invention solves the above-mentioned conventional problems and aims to provide a small solenoid that can reduce operating noise.

(Means for Solving the Problems) However, the solenoid of this device includes a bobbin wound with a coil and having a through hole, a yoke surrounding the bobbin, and a plunger partially inserted into the through hole. A solenoid comprising: a solenoid having a protruding pin perpendicular to the axis of the plunger on the protruding end of the plunger, the pin engaging with the pin and guiding the pin in a direction parallel to the axis of the plunger; Attaching the guide to the yoke,
A rotary damper, which is formed by filling a partially cylindrical cavity of a sealed container with a viscous liquid and fitting a rotating body whose base is fixed to a swing shaft with a small gap into the cavity, is attached to the yoke. The solenoid is characterized in that the tip of a lever attached and fixed to the swing shaft is engaged with the pin.

(Function) In the solenoid of this invention, the pin protruding from the plunger is guided by a pin guide,
It moves almost in a straight line along with the plunger. During plunger operation, the rotary damper applies a braking force to the plunger via a lever that engages with a pin that moves along this predetermined trajectory, and the plunger moves at a low speed to prevent the fixed core from moving during plunger suction operation. Collision noise and/or collision noise on the side of the controlled object connected to the plunger during the plunger protrusion operation is reduced. This braking force acts on the protruding end of the plunger via the pin, so this braking force and the plunger suction force by the coil act in a way that pulls the plunger. vibration is suppressed, and noise and wear caused by this vibration are suppressed.

(Embodiment) An embodiment of this invention will be described below with reference to FIGS. 1 to 8.

In the figure, 1 is a solenoid main body, 60 is a cover having a rotary damper 62, etc., which will be described later, and both are fastened and connected by a screw 68 passing through a leg 5a of a yoke 5 of the solenoid main body.

First, as shown in FIG. 4, in the solenoid body 1, 2 is a bobbin having a through hole 2a, and a suction coil 3a and a holding coil 3b connected in series thereto.
A coil 3 consisting of the following is wound. A yoke 5 surrounds the bobbin 2, and is composed of a frame 6 made of a magnetic material plate bent into a U-shape, and a lid 7 made of a magnetic material plate caulked to this frame. A molding resin is injected between the yoke 5 and the outer circumference of the bobbin 2 around which the coil 3 is wound, and solidifies to form a resin layer 8.
is formed. Reference numeral 9 denotes a fixed iron core that is fixed and protrudes from the frame 6 so as to be inserted into one end of the through hole 2a. Reference numeral 11 denotes a plunger which is partially inserted into the through hole 2a, and whose insertion side end 12 can freely move toward and away from the fixed iron core 9. As shown in FIG. A small diameter portion 15 is formed through the portion 14, and a ring 16 made of a magnetic material is slidably inserted into this small diameter portion. Reference numeral 17 denotes an operating member made of resin, which is fixed to the ring 16 with a mounting screw 18, and is attached to the plunger 1 together with the ring 16.
It is rotatable and slidable along 1. The operating member 17 has a thin cylindrical portion 17a facing the stepped portion 14 of the plunger 11, and the inner diameter portion of the ring 16 fits into this cylindrical portion 17a. Cylindrical part 17
The inner diameter of a is slightly larger than the outer diameter of the small diameter portion 15 of the plunger 11. A pin-shaped resin push piece 20 parallel to the axis 11a of the plunger 11 is fixed to a protrusion 19 protruding from the outer periphery of the operating member 17. Reference numeral 21 designates three followers made of resin that protrude and are fixed to the outer periphery of the operating member 17.
0. Reference numeral 23 denotes a pin consisting of a spring pin, which is attached to the protruding end 1 of the plunger 11.
3, it is driven and fixed in a direction perpendicular to the axis 11a of the plunger. Also, 24 is the plunger 11
a return spring interposed between the and the operating member 17;
It is a compression/torsion coil spring that is hooked at one end to a pin 23 and at the other end to a groove 25 provided in the operating member 17, and is a sliding member that presses the ring 16 together with the operating member 17 toward the stepped portion of the plunger 11. It serves both as a dynamic urging means and a rotational urging means for urging the operating member 17 together with the ring 16 in the clockwise direction (arrow Y direction) in FIG. 26 is plunger 1
This is a hole drilled in the protruding end portion 13 of 1, and is a hole for connecting a controlled object (not shown).

On the other hand, as shown in FIGS. 4 to 6, the flange 31 on the plunger insertion side of the bobbin 2 has a thick wall and an irregular shape, and two fixed contacts 33 are fixed to the outward protrusion 32. A retaining plate 34 is fixed. In addition, the brim 31 has an elongated cavity 35 that opens to the outside.
A supporting piece 36 made of an elastic material whose base is fixed to the bottom of the cavity has a bent piece 36a whose tip end side is bent into an L-shape, and this bent piece 36a. Two movable contacts 37 facing the fixed contact 33 are fixed to the
3 and 37 form a switching contact 38. The push piece 20 fixed to the operating member 17 is adapted to engage with the support piece 36 at a position closer to the base than the bent piece 36a. Further, this switching contact 38 is connected in parallel to the holding coil 3b as shown in the eighth figure. 40 and 41 are terminals connected to the ends of each coil, and are connected to the other collar 42 of the bobbin 2.
It is fixed to. The connection ends 43 and 44 of the holding plate 34 and the support piece 36 of both contacts are connected to the collar 3.
Along with lead wires protruding outward from 1 and connecting these to each coil or each terminal 40, 41,
It is fixedly held in the form of being buried in the resin layer 8.

On the other hand, 50 is a resin end face cam fixed to the lid 7 of the yoke 5 with screws 51, and a mounting plate 53 having a hole 52 into which the ring 16 is loosely fitted has three cams curved in an arc shape along the hole 52. A protruding piece 54 is provided.
As shown in FIG. 7, the projecting piece 54 has an end surface 55 in the form of an inclined surface that becomes higher as the return direction side of the ring 16 shown by arrow Y faces toward the plunger projecting side. Note that the top surface 56 of the protruding piece 54 that does not engage with the follower 21 (described above) has a flat shape. Note that a follower 21 is protruded and fixed to the operating member 17 at a position opposite to the protruding piece 54 .

On the other hand, as shown in FIGS. 1 to 3, the cover 60
is formed by integrally connecting a cover body 61 that covers the upper part of the yoke 5 such as the switching contact 38, a rotary damper 62, and a pin guide 63 that guides the pin 23. First, the pin guide 63 has a groove 65 parallel to the axis 11a of the plunger 11 in a protruding piece 64 formed integrally with the cover body 61, and the pin 23 is guided by this groove 65. Outer wall surface 66a of one wall 66 forming this groove 65
constitutes a stopper against which the pusher piece 20 of the operating member 17 slides and which restricts the rotational position of the operating member 17 and the pusher piece 20 which is biased in the direction of arrow Y by the spring force of the return spring 24. Reference numeral 67 is a guide wall for the pusher piece 20 formed at the end of the protruding piece portion 64, which is used to return the pusher piece 20 to the return position rotated in the direction of the arrow Y when the plunger is protruded, even when the return spring 24 is broken. It is. Also, the rotary damper 62
The cylinder 7 is integrally formed with the cover body 61.
0, a lid 71 hermetically attached to this cylinder,
It consists of a swing shaft 72 that passes through the lid, and a rotating body 74 that fits into a cavity 73 surrounded by the cylinder 70 and the lid 71 with a small gap and has its base fixed to the swing shaft 72. The cavity 73 is partially filled with a partition wall 75 that slides on the swing shaft 72 and has a partially cylindrical shape, and a viscous liquid such as silicone oil is sealed inside the cavity 73. 76
3 is a check valve provided in the rotating body 74, which consists of a hole 77 bored in the rotating body 74 and a flexible piece 78 such as a soft resin sheet whose base end is fixed to the rotating body 74. When the rotating body 74 rotates in the direction of arrow R, the hole 77 is closed, and when the rotating body 74 rotates in the opposite direction, the hole 77 is opened. Reference numeral 79 designates a relief groove recessed in the inner wall surface 70a of the cylinder 70, which provides a gap between the tip of the rotating body 74 and the inner wall surface 70a, which corresponds to the opening operation of the switching contact 38 shown by the chain line 80 in FIG. This is to widen the damper 62 and lower the braking force of the rotary damper 62. 81 is an O-ring for sealing the swing shaft 72. Further, 82 is a lever fixed to the swing shaft 72, and a pin 23 is engaged with a bifurcated tip 83 of the lever.

In the solenoid 90 having the above configuration, when the coil is de-energized, the plunger 11 is in the illustrated position, the ring 16 and the operating member 17 are in a position separated from the lid 7 together with the plunger 11, and the switching contact 38 is closed. . The operating member 17 and the ring 16 are biased by the return spring 24 into the illustrated return position, with the ring 16 being pressed against the step 14 of the plunger 11 . Note that the plunger 11 is connected to a controlled body (not shown) via a hole 26. Therefore, when power is supplied to the terminals 40 and 41, since the holding coil 3b is short-circuited by the switching contact 38, a large current flows to the attraction coil 3a, and the plunger 1
1 is sucked in the direction of arrow Z, the ring 16 also moves in the direction of arrow Z, and at the end of the plunger suction stroke, the follower 21 moves toward the end face cam 50.
, and is pressed against the end surface 55 by the plunger suction force, so that it is driven in the operating direction shown by the arrow X, causing the operating member 17 and the ring 16 to rotate in the arrow X direction. This rotational force is applied to the return spring 24
The pushing piece 20 is rotated in the direction of the arrow X to overcome the spring force, and the supporting piece 36 is pushed to open the switching contact 38, and a small current flows through the attracting coil 3a and the holding coil 3b connected in series. Switch to flowing holding state. During this plunger suction operation,
The pin 23 is guided by the pin guide 63 and moves in the direction of arrow S, and the lever 82 that engages with this pin 23 rotates in the direction of arrow R, so that the rotary damper 6
A resistance force is generated in the second rotating body 74 due to the viscous liquid in the cavity 73, and this applies a braking force to the pin 23 and therefore to the plunger 11. As a result, the plunger 11 is attracted at a low speed corresponding to the braking force of the rotary damper 62. At the end of the suction stroke, the relief groove 79 on the inner wall surface 70a of the cylinder 70
When the tip of the rotating body 74 reaches this part, the rotating damper 6
Since the braking force of 2 is reduced, the plunger 11 opens the switching contact 38 at a slightly increased speed to prevent chattering when the contact is opened and to ensure the contact is opened. Next, the rotating body 74 reaches the terminal end of the relief groove 79 and moves to the rotating damper 62 again.
generates a large force and the plunger 11 collides with the fixed iron core 9 at low speed.

When the plunger 11 protrudes due to power cutoff of the coil, the elastic force of the support piece 36 and the spring force of the return spring 24 cause the ring 16, the operating member 17, and the follower 21 to return to their initial states. During this plunger protrusion operation, the check valve 76 provided on the rotating body 74 of the rotary damper 62 opens, so the rotary damper 62 does not generate a large braking force, and the plunger 11 does not generate a large braking force due to the tensile force from the connected controlled body. It can be ejected at a relatively high speed depending on the situation.

This invention is not limited to the above embodiment. For example, in the above embodiment, the cylinder 70 of the rotary damper 62 and the pin guide 63 are connected to the cover body 63.
1, the rotary damper and pin guide have the advantage of being economical because they require fewer parts and fewer assembly steps; however, the rotary damper and pin guide may be separately attached to the yoke. Further, the cylinder 70 of the rotary damper 62 may be fan-shaped, and if it is desired to obtain a low speed even when the plunger 11 is protruding, the check valve 76 may be omitted. 11 is connected to the controlled body side, and furthermore, by using a check valve that opens and closes in the opposite direction to this check valve 76, it is possible to reduce only the collision sound on the controlled body side. . These check valves may be provided on the partition wall 75, and the relief groove 79 may be omitted if the contact opening operation can be performed at a low speed.

Further, in the above embodiment, a coil switching type solenoid was described in which the switching contact 38 was switched by the rotational movement of the push piece 20 around the plunger 11 driven by the end cam 50. For example, in 1987-
It can also be widely applied to coil-switching solenoids that switch contacts using a ring that moves linearly with a plunger, as shown in Japanese Patent No. 136112, and to DC or AC solenoids that do not switch coils.

(Effects of the invention) As explained above, according to this invention, the rotary damper and the pin guide can be disposed at the side of the plunger on the projecting side of the plunger, so the overall length of the solenoid can be shortened. In addition, the braking force from the rotary damper is transmitted to the plunger through a simple mechanism consisting of a lever and a pin, so the entire structure can be made compact and inexpensive, and since the braking force is applied to the protruding end of the plunger, the plunger suction The vibration of the plunger during the braking stroke is suppressed, and the impact noise of the plunger against the fixed iron core can be reduced without generating noise or wear caused by this vibration.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, and FIG. 1 is a front view of the solenoid, and FIG. 2 is a view taken along arrow A-A in FIG.
3 is a partially cutaway plan view, FIG. 4 is a partially cutaway plan view with the cover removed, FIG. 5 is a sectional view taken along line B-B in FIG. 4, 6 is a sectional view taken along line CC, FIG. 7 is a partial side view taken along line DD in FIG. 2, and FIG. 8 is a connection diagram. 1...Solenoid body, 2...Bobbin, 2a...
...Through hole, 3...Coil, 5...Yoke, 11...
Plunger, 11a...Axis, 13...Protruding side end, 60...Cover, 62...Rotating damper, 63
...Pin guide, 65...Groove, 68...Screw, 7
0... Cylinder, 71... Lid, 72... Swing axis,
73...Cavity part, 74...Rotating body, 82...Lever, 83...Tip part, 90...Solenoid.

Claims (1)

[Scope of utility model registration request] A solenoid comprising a bobbin wound with a coil and having a through hole, a yoke surrounding the bobbin, and a plunger partially inserted into the through hole, the plunger having a protruding end portion thereof. A pin protrudingly provided perpendicular to the axis, and a pin guide that engages with the pin and guides the pin in a direction parallel to the axis of the plunger is attached to the yoke, and a partially cylindrical hollow part of the sealed container. A rotary damper comprising a rotating body filled with a viscous liquid and having its base fixed to a swing shaft is fitted into the cavity with a small gap, and is attached to the yoke and fixed to the swing shaft. A solenoid characterized in that a tip of a lever is engaged with the pin.