JP2002057024A - Sound deadening structure of solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deaden the operating sound of a plunger effectively even when a voltage applied to a solenoid fluctuates. SOLUTION: This sound deadening structure is equipped with a spacer 5 which is formed of buffer material, fitted to a plunger 2 advancing and retreating inside a coil 1, and brought into contact with a yolk 3 surrounding the coil so as to keep a clearance between the plunger 2 and a plunger pad 4. Small projections 5b are provided on the surface of the spacer 5 abutting against the yolk 3 in a radial manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to a technical field related to a silencing structure for silencing an operating noise associated with a forward / backward movement of a plunger of a solenoid.

[0002]

2. Description of the Related Art Conventionally, as a muffling structure of a solenoid, for example, a cushioning function for securing a clearance between a plunger and a plunger receiver by being fitted to a plunger which advances and retreats inside the coil and abutting on a yoke surrounding the coil. There is a known one provided with a spacer formed of a material (rubber or the like).

According to the conventional silencing structure of the solenoid, since a clearance is secured between the plunger and the plunger receiver by the spacer, a direct collision between the plunger and the plunger receiver is avoided. The generation of collision sound is prevented. In addition, since the spacer made of a buffer material absorbs the impact of the collision with the yoke, the sound of the collision between the spacer (the spacer supporting member) and the yoke is attenuated.

[0004]

SUMMARY OF THE INVENTION In the above-described conventional silencing structure of a solenoid, there is a problem that the operating sound of the plunger is not effectively silenced because the collision sound of the spacer and the yoke is not sufficiently attenuated due to the limitation of the material of the spacer. There is a point.

When a high voltage is applied to the solenoid and the plunger is strongly sucked, the operating sound of the plunger tends to increase. However, since there is no available spacer material that effectively exhibits a buffer function for both high pressure and low pressure, when using a vehicle-mounted battery with a large voltage fluctuation as the power supply for the solenoid, etc. ,
There is a problem that the operating sound of the plunger is not effectively silenced.

The present invention has been made in view of the above problems, and provides a solenoid silencing structure capable of effectively silencing the operation sound of a plunger even when the voltage applied to the solenoid fluctuates. The task is to

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, a solenoid silencing structure according to the present invention employs the following means.

In other words, in the first aspect, the spacer is formed of a buffer material which is fitted to the plunger which advances and retreats inside the coil and abuts on the yoke surrounding the coil to secure a clearance between the plunger and the plunger receiver. And a small projection is formed on a contact surface of the spacer with the yoke.

According to this means, the small projections of the spacer are deformed under pressure by varying the degree of deformation under both high pressure and low pressure, and exhibit a buffering function. The portions other than the small projections of the spacer secure the clearance between the plunger and the plunger receiver together with the small projections deformed by pressing.

According to a second aspect of the present invention, in the solenoid silencing structure of the first aspect, at least two types of small projections having different projection heights are formed.

In this means, a stepwise buffer structure is formed.

According to a third aspect of the present invention, in the solenoid muffling structure of the second aspect, the small projection has a mountain-shaped cross section that becomes smaller toward the tip of the projection, and the small projection having a high projection height has an angle of the mountain. The low and small projections which are formed small and have a low protrusion height are characterized in that the angle of the chevron is formed large.

According to this means, the high and small projections are relatively easily deformed by pressure, and the low and small projections are hardly deformed by pressure.

According to a fourth aspect of the present invention, in the solenoid silencing structure of any one of the first to third aspects, a small projection is also formed on a surface opposite to a contact surface of the spacer with the yoke, and both surfaces of the spacer are formed. The arrangement of the small projections is matched.

With this means, the buffer function is exerted on both surfaces of the spacer.

According to a fifth aspect of the present invention, in the solenoid silencing structure of any one of the first to fourth aspects, a seat plate abutting on the entire surface opposite to the abutting surface of the spacer with the yoke is fixed to the plunger. It is characterized by the following.

According to this means, the seat plate lined with the spacer equalizes the pressure applied to the spacer.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a solenoid noise reduction structure according to the present invention will be described with reference to the drawings.

FIG. 1 to FIG. 3 show an embodiment (1) of a silencing structure of a solenoid according to the present invention.

In this embodiment, similarly to the above-described conventional example, the plunger 2 is fitted into the plunger 2 which advances and retreats inside the coil 1 and abuts on the yoke 3 surrounding the coil 1 so that the plunger 2 and the plunger receiver 4 are interposed. It is provided with a spacer 5 formed of a buffering material for ensuring clearance.

The plunger 2 slides inside a slide tube 7 fitted on a bobbin 6 around which the coil 1 is wound, and advances and retreats, and a frustum-shaped plunger receiver 4 fixed inside the slide tube 7. In addition, the limit of the suction slide is regulated. The plunger 2 is provided at one end with a conical fitting groove 2a that fits into the plunger receiver 4.
At the other end, a step portion 2b is provided as a support member for the plunger 2 to which a seat plate 8 having a size and shape to be in contact with the entire surface of the plunger 2 is fitted and fixed. A shaft 9 is inserted and fixed coaxially to the other end of the plunger 2.

The spacer 5 is formed in a ring plate shape, is fitted to the plunger 2, and comes into contact with a seat plate 8 fixed to the step 2 b of the plunger 2. The yoke 3 includes a main body 3 a surrounding the coil 1, the bobbin 6, and the like in a U-shape, and a plate-shaped lid 3 b attached to the main body 3 a on the opposite side of the plunger receiver 4. Therefore, the spacer 5 is connected to the plunger 2
Collides with the lid 3b of the yoke 3 by retreating.

As shown in detail in FIG. 2, the spacer 5 has a lid 3b of the yoke 3 of the ring plate-shaped main body 5a.
Small projections 5b are radially formed on the contact surface of the small protrusion 5b. The main body 5a and the small projections 5b are integrally formed of fluoro rubber or the like. The small projections 5b are formed in a mountain shape with a cross section that becomes smaller toward the protruding tip, and 12 are arranged on the inside at an angle a of 30 degrees and 18 on the outside at an angle b of 20 degrees.
It has a column structure. Regarding the size of the small projections 5b, when the thickness c of the main body 5a is 0.6 mm, the angle d of the chevron is set to 80 to 100 degrees, and the diameter e of the base of the chevron is about 1.4 mm, and It is preferable that the thickness f including the thickness c of the main body 5a is designed to be about 1.35 mm.

According to this embodiment, when the plunger 2 is attracted and retracted by the application of a voltage to the solenoid, and when the spacer 5 collides with the lid 3b of the yoke 3, the small projection 5b of the spacer 5 is 3 and is deformed by pressure (see the enlarged display in FIG. 1). Therefore, the small projections 5b of the spacer 5 exhibit a buffering function, and the sound of collision between the spacer 5 (the seat plate 8 as a support member of the spacer 5) and the lid 3b of the yoke 3 is reliably suppressed. In particular,
When the voltage applied to the solenoid fluctuates, the plunger 2
Even if the suction retreat force changes, the pressure deformation of the small projections 5b of the spacer 5 naturally changes the degree of deformation corresponding to the collision pressing force. Therefore, even if the voltage applied to the solenoid fluctuates, the operating sound of the plunger 2 can be effectively silenced.

Since the seat plate 8 is designed to line the entire surface of the main body 5a of the spacer 5, the collision pressure applied to the spacer 5 is equalized. Therefore, the spacer 5
The cushioning function of the small projections 5b is uniformly and reliably exerted, and precise movement of the plunger 2 is ensured without applying unnecessary stress to the operating direction of the plunger 2.

The pressure deformation of the small projections 5b of the spacer 5 prevents pressure transmission and avoids unnecessary pressure deformation of the main body 5a. Therefore, the clearance between the plunger 2 and the plunger receiver 4 is reliably ensured, and the generation of the collision sound of the plunger 2 and the plunger receiver 4 is reliably prevented.

FIGS. 4 and 5 show an embodiment (2) of a silencing structure for a solenoid according to the present invention.

In this embodiment, as shown in FIG.
The spacer 5 has a two-row configuration in which 12 small protrusions 5b are arranged inside at an angle of 30 degrees and 16 are arranged outside at an angle of 22.5 degrees. And in the inner row,
Two small protrusions 5b ″ having a low protrusion height are arranged between the small protrusions 5b ′ (represented by grid lines) having a high protrusion height. Every other small projection 5b ″ is arranged. Therefore, one or two small projections 5b 'are radially arranged at an angle of 45 degrees.

Further, in this embodiment, as shown in FIG. 5, the angle d of the angle of the height projection 5b 'is set to 80 degrees,
The angle d of the angle of the small projection 5b "is set to 100 degrees.

According to this embodiment, basically, the same operations and effects as those of the above-described embodiment (1) can be obtained. However, since the small projections 5b of the spacer 5 have a two-stage structure of the high and small projections 5b 'and the low small projections 5b ", the buffer function of the spacer 5 is improved as compared with the above-described embodiment (1).

Further, since the high and small projections 5b 'are relatively easily deformed by pressure and the low and small projections 5b "are hardly deformed by pressure, depending on the pressure of collision of the spacer 5 with the cover 3b of the yoke 3, The small and large projections 5b 'exhibit a buffering function, and the small and small projections 5b "exhibit a function of complementing the main body 5a for securing a clearance between the plunger 2 and the plunger receiver 4.

FIG. 6 shows an embodiment (3) of a sound deadening structure for a solenoid according to the present invention.

In this embodiment, small projections 5b are formed on both surfaces of the spacer 5. Regarding the small projection 5b, any of the above-described embodiments (1) and (2) can be adopted. However, in order to equalize the pressure of the collision applied to the spacer 5, the arrangement of the small protrusions 5b on both sides is made to coincide.

According to this embodiment, basically, the same operations and effects as those of the above-described embodiments (1) and (2) can be obtained. However, since the buffer function is exerted on both sides of the spacer 5, the buffer function of the spacer 5 is improved as compared with the above-described embodiments (1) and (2).

As described above, in addition to the illustrated embodiment, it is also possible to form three or more types of small projections 5b of the spacer 5, to arrange three or more rows, and to change the shape and size.

Further, it is also possible to select a material other than fluororubber as the material of the spacer 5.

[0037]

Embodiments Embodiments (1), (2) and (3) described above.
For, the generated sound was measured. The measurement method is JIS
It conformed to the noise measurement of C1505. The conventional example is A, the embodiment (1) is B, the small projection 5b of the embodiment (1) is formed on both surfaces is C, and the small projection 5b of the embodiment (2) is formed.
Is formed on both sides (that is, corresponds to Embodiment (3)). The measurement results are as follows. A 58 dB B 49 dB C 41 dB D 36 dB According to the measurement results, it is understood that the present invention is effective for silencing the operation sound accompanying the advance and retreat of the plunger of the solenoid.

[0038]

As described above, in the noise reduction structure of the solenoid according to the present invention, the small protrusion of the spacer has a variable deformation degree for both high pressure and low pressure, and is deformed under pressure to perform the buffer function. Therefore, the operation sound of the plunger can be effectively silenced even if the voltage applied to the solenoid fluctuates.

Furthermore, the second aspect of the present invention has an effect that the operation sound of the plunger can be more effectively silenced because the stepwise buffer structure is configured.

Further, the high and small projections are relatively easily deformed by pressure, and the low and small projections are not easily deformed by pressure. This has the effect that the function of ensuring the clearance between the plunger and the plunger receiver can be exerted on the low and small projections.

Further, as a fourth aspect, since the cushioning function is exerted on both surfaces of the spacer, there is an effect that the operating noise of the plunger can be more effectively silenced.

Furthermore, in order to equalize the pressure applied to the spacer by the seat plate lined with the spacer, the cushioning function of the small projections of the spacer can be uniformly and reliably exerted, and the operating direction of the plunger can be improved. There is an effect that precise movement of the plunger is guaranteed without giving unnecessary stress to the plunger.

[Brief description of the drawings]

FIG. 1 is a sectional view of an exploded state showing an embodiment (1) of a sound deadening structure for a solenoid according to the present invention.

FIG. 2 is an assembled state diagram of FIG. 1;

FIG. 3 is an enlarged sectional view taken along line XX of FIG. 1;

FIG. 4 is a cross-sectional view of a main part of a solenoid silencer according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view taken along line YY of FIG. 4;

FIG. 6 is a cross-sectional view of a main part showing a third embodiment of the solenoid noise reduction structure according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 coil 2 plunger 3 yoke 4 plunger receiver 5 spacer 5a main body 5b small protrusion 5b 'high and small protrusion 5b "low and small protrusion

Claims (5)

[Claims] 1. A solenoid having a spacer formed of a buffering material which is fitted to a plunger which advances and retreats inside the coil and which abuts on a yoke surrounding the coil to secure a clearance between the plunger and the plunger receiver. A silencing structure for a solenoid, wherein small protrusions are radially formed on a contact surface of the spacer with the yoke. 2. The solenoid noise reduction structure according to claim 1, wherein at least two types of small projections having different protrusion heights are formed. 3. The solenoid muffling structure according to claim 2, wherein the small projection is formed in a chevron-shaped cross section which becomes smaller toward the protruding tip, and the small projection having a high protruding height is formed with a small angle of the chevron. The muffler structure of a solenoid, wherein the low and small projections having a small height have a large angle of angle. 4. The small noise projection structure according to any one of claims 1 to 3, wherein a small projection is also formed on a surface opposite to a contact surface of the spacer with the yoke, and the small projections on both surfaces of the spacer are arranged. A solenoid silencing structure characterized by matching. 5. A silencing structure for a solenoid according to any one of claims 1 to 4, wherein a seat plate abutting on the entire surface of the spacer opposite to the abutting surface on the yoke is fixed to the plunger. Solenoid silencing structure.