JPH0583994U - Electromagnetic relay - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to an electromagnetic relay suitable for automobile-mounted equipment, air-conditioning equipment, etc., and provides an electromagnetic relay in which the operating characteristics are not deteriorated and the operation noise at the time of operation and restoration is suppressed The purpose is to [Structure] The fixed contact springs 9a and 9b have elasticity.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic relay suitable for electric components of automobiles, air conditioners and the like.

[0002]

[Prior Art]

 In recent years, with the demand for improved livability and indoor comfort of automobiles, there has been a demand for quieter operation and improved sound quality of electromagnetic relays used in intermittent wipers, flashers, air conditioners, coolers, etc. There is.

Conventionally, in order to reduce the operating noise of the electromagnetic relay, the electromagnetic relay has a double structure (see: Japanese Utility Model Laid-Open No. 62-135333), or an elastic member is attached to the armature portion (see: Japanese Utility Model Publication No. 63-23754).

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional electromagnetic relay, since the electromagnetic relay has a double structure, there are drawbacks that the shape is large and the cost is high. Also, if the shape is made smaller, there is a risk that the characteristics of the original electromagnetic relay may be impaired. On the other hand, in the case where the elastic member is attached to the armature part, there is a risk that the contact pressure of the contact decreases, the contact voltage drop increases, heat is generated, and the contact life becomes short. The present invention solves such conventional problems, and an object thereof is to provide an electromagnetic relay that is small in size and has a simple structure and that reduces operating noise and vibration noise.

[0005]

[Means for Solving the Problems]

 In the present invention, in order to solve the above problems, the first means is that the fixed contact spring has elasticity, and the fixed contact spring has a free end. The second means is a fixed contact spring to which a vibration damping member made of a thin metal plate and a vibration damping adhesive is attached. The third means is to make the stiffness of the fixed contact spring and the stiffness of the movable contact spring to be approximately the same.

[0006]

[Action]

 According to the above-mentioned means, the collision of the fixed contact and the movable contact at the time of opening / closing at the time of operation and restoration of the electromagnetic relay is buffered.

[0007]

【Example】

 An electromagnetic relay according to an embodiment of the present invention will be described with reference to FIGS.

1 to 3, reference numeral 1 is a coil attached to the winding frame 2, 3 is a yoke, and 4 is an iron core, which is attached to the yoke 3 through the winding frame 2 by caulking. 5 is a movable contact spring which is attached to the armature of 6 and is further attached to the yoke 3 by crimping. A movable contact 7 is incorporated in the movable contact spring 5. Reference numerals 8a and 8b denote fixed contacts (8a is a make side and 8b is a break side), which are attached to fixed contact springs 9a and 9b. Reference numerals 10a and 10b denote vibration damping members made of a metal thin plate 101 made of an aluminum plate or the like and a vibration damping adhesive 102, which are attached to the outside of the fixed contact springs 9a and 9b. The anti-vibration members 10a and 10b may be attached inside the fixed contact springs 9a and 9b.

Next, the operation of the above embodiment will be described. When a voltage is applied to the coil 1 to excite the iron core 4, the armature 6 is attracted to the iron core 4 and at the same time the movable contact 7 comes into contact with the make contact 8a. In this case, as shown in FIG. 3, since the tip of the fixed contact spring 9a is set as a free end and its stiffness is set small, the moment the movable contact 7 collides with the make contact 8a, as shown by the broken line in FIG. The fixed contact point spring 9a moves downward in a bending manner. Due to the stiffness of the fixed contact spring 9a, the collision force between the movable contact 7 and the make contact 8a and the collision force between the armature 6 and the iron core 4 are weakened, and the operating noise generated at this time is reduced.

In the above state, when the coil 1 is de-energized to de-energize the iron core 4, the armature 6 separates from the iron core 4, and at the same time, the movable contact 7 contacts the break contact 8b. In this case, since the stiffness of the fixed contact spring 9b is set small as in the above case, the collision force when the movable contact 7 comes into contact with the break contact 8b is weakened, and the operating noise generated at this time is small. It will be suppressed.

Further, by setting the stiffness of the fixed contact springs 9a, 9b and the movable contact spring 5 to the same level, the impact force at the time of operation recovery of the electromagnetic relay is further buffered, and the attenuation of the operating noise accompanying this is accelerated. You can

Further, as a result, the bouncing time at the time of contact between the movable contact 7 and the fixed contact (make) 8a when the electromagnetic relay is activated is 2 (msec) in the conventional case as shown in FIG. As shown in FIG. 11 (B), some of them have a very short value of about 0.3 (msec), arcs are less likely to occur, and contact life is greatly extended.

Although the tip of the fixed contact spring 9a is a free end as shown in FIG. 3 in the above embodiment, the fixed contact spring 9a may be made thinner or a spring material may be used. It is also possible to set the stiffness small.

FIG. 4 shows fixed contact springs 9a and 9b to which vibration damping members 10a and 10b made of an aluminum plate and a vibration damping adhesive are attached, and the operation thereof will be described.

When the coil 1 is energized and the iron core 4 is excited, the armature 6 is attracted to the iron core 4, and at the same time, the movable contact 7 comes into contact with the make contact 8a. In this case, the impact force when the armature 6 hits the upper surface of the iron core 4, and the vibration noise is generated in the movable contact spring 5, the fixed contact spring 9a and other interlocking springs in the form of being superimposed on the operation sound. The vibration sound of the contact spring 9a is attenuated by the antivibration member 10a, and in particular, the harmonic components that are audible to human ears can be greatly attenuated. Incidentally, FIG. 12 shows a vibration waveform in the case where no vibration isolator is provided, and FIG. 13 shows a vibration waveform in the case of the above embodiment. Regarding the operation when the coil 1 is de-energized, the movable contact point 5 and the fixed contact point spring 9a are separated from each other at the moment they are separated from each other, and the fixed contact point tip is a free end. Dynamic noise is generated, but this is damped by the vibration isolator 10a. Further, when the movable contact spring 5 and the fixed contact spring 9b come into contact with each other, the vibration sound is attenuated as in the operation. Similarly, the vibration sound of the fixed contact spring 9b can be attenuated. Furthermore, if the vibration isolating members 10a and 10b are attached to the movable contact spring 5, the vibration noise of the movable contact spring 5 can be attenuated. The attached antivibration members 10a and 10b are more effective due to their effects. You can set it to any position. Further, even if the vibration isolation members 10a and 10b are adhered to the inside of the cover of the electromagnetic relay, the vibration noise can be attenuated. In addition to aluminum, the vibration-proof members 10a and 10b may be made of a material (stainless steel, brass, lead, etc.) which is more effective depending on its natural frequency.

5 and 6, reference numeral 13 denotes an air damper, and 12 denotes a substrate for supporting the air damper 13. The air damper 13 is composed of a piston 13a, a cylinder 13b, and a connecting member 13c in which the piston 13a is engaged with the free end of the movable contact spring 5. Describing the operation, the moving speed of the movable contact spring 5 is damped by the viscous resistance of the air flowing through the gap between the piston 13a and the cylinder 13b, and as a result, the armature 6 when the electromagnetic relay is operating is moved to the iron core 4 When the impact force on the upper surface of the movable contact 7 and the movable contact 7 strikes the fixed contacts 8a and 8b, the operating noise generated on the movable contact spring 5 and the fixed contact springs 9a and 9b is attenuated by the impact force. The cylinder 13b of the air damper 13 can be formed at the same time when the substrate 12 is molded, so that the number of components of the electromagnetic relay can be reduced.

7 to 11 show another embodiment of the present invention. FIG. 7 shows an exploded perspective view thereof, and FIGS. 8 to 11 show an example of a fixing method for attaching the vibration isolating member 10a to the fixed contact spring 9a. In FIG. 8, the vibration-proof members 10a and 10b are fixed by the rivets 12. In FIG. 9, a hole II is opened in the fixed contact spring 9a, a vibration isolating member 10a is inserted therein, and burring is performed at the position of this hole. The member 10a is prevented from coming off. FIG. 10 shows a structure in which the vibration-proof members 10a and 10b are fixed so as to be sandwiched between the fixed contact springs 9a and 9b. In FIG. 8, a cutout is provided in the fixed contact spring 9a, and the vibration-proof member 10a is attached thereto. In particular, it is intended to prevent the vibration-proof member 10a from coming off due to a peculiar vibration that occurs in the case of electrical equipment for automobiles, and does not require additional parts such as rivets.

[0018]

[Effect of the device]

 As described above, the present invention, when the fixed contact spring is made of an elastic body, is generated at the time of operation and restoration of the electromagnetic relay without impairing the original contact opening / closing operation and without upsizing. Vibration sound can be attenuated. Furthermore, by attaching a vibration isolator to a fixed contact spring or a movable contact spring, its effect is enhanced, and in particular, the high harmonic component of the terminal is cut and the duration of vibration is shortened, resulting in annoying vibration. It has the effect of eliminating the sound and significantly improving the sound quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an electromagnetic relay according to the present invention.

FIG. 2 is a partially cutaway side view of the electromagnetic relay of FIG.

FIG. 3 is a partial side view of FIG.

FIG. 4 is a perspective view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 5 is a perspective view showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 6 is a side view of FIG.

FIG. 7 is a perspective view showing a fourth embodiment.

FIG. 8 is a partial view showing a fifth embodiment of the electromagnetic relay according to the present invention.

FIG. 9 is a partial view showing a fifth embodiment of the electromagnetic relay according to the present invention.

FIG. 10 is a partial view showing a fifth embodiment of the electromagnetic relay according to the present invention.

FIG. 11 is a timing diagram showing contact bouncing waveforms of the related art and the present invention.

FIG. 12 is a timing chart showing a vibration waveform of a fixed contact spring without a vibration isolator.

FIG. 13 is a timing diagram showing a vibration waveform of a fixed contact spring when a vibration isolator is attached.

[Explanation of symbols]

 1 ... Coil 2 ... Reel 3 ... Yoke 4 ... Iron core 5 ... Moving contact spring 6 ... Armature 7 ... Moving contact 8 ... Fixed contact 8a ... Make contact 8b ... Break contact 9a, 9b ... Fixed contact spring 10a, 10b ... Anti-vibration member 11 ... Hole 12 ... Substrate 13 ... Air damper 13a ... Piston 13b ... Cylinder 13c ... Connection member 101 ... Metal thin plate 102 ... Anti-vibration adhesive

Claims (4)

[Scope of utility model registration request] 1. A fixed contact spring (9a, 9b) having a fixed contact (8), a movable contact spring (5) having a movable contact (7) facing the fixed contact, and the movable contact spring. An electromagnetic relay comprising an engaged armature (6) and an iron core (4) for attracting the armature, wherein the fixed contact spring has elasticity. 2. The electromagnetic relay according to claim 1, wherein a tip of the fixed contact spring is a free end. 3. A fixed contact spring (9a, 9b) having a fixed contact (8), a movable contact spring (5) having a movable contact (7) facing the fixed contact, and the movable contact spring. An electromagnetic relay comprising an engaged armature (6) and an iron core (4) for attracting the armature, comprising: a metal thin plate (101) and a protection plate on at least one of the fixed contact spring and the movable contact spring. An electromagnetic relay in which vibration damping members (10a, 10b) made of a vibration adhesive (102) are attached. 4. A fixed contact spring (9a, 9b) having a fixed contact (8), a movable contact spring (5) having a movable contact (7) opposed to the fixed contact, and the movable contact spring. In an electromagnetic relay comprising an engaged armature (6) and an iron core (4) for attracting the armature, the stiffness of the fixed contact spring is set to be approximately the same as the stiffness of the movable contact spring. A characteristic electromagnetic relay.