KR100954525B1 - A small size solenoid device - Google Patents

Abstract

PURPOSE: A small solenoid device is provided to improve heat resistance and cold resistance by coating the outer surface of a plunger with Teflon or molybdenum instead of grease. CONSTITUTION: An aperture is formed on both sides of a bracket. A bobbin(120) is arranged inside the bracket. A penetration hole(121) is formed inside a bobbin. A coil is wound around the outer surface. A hollow sleeve is arranged inside the penetration of hole of the bobbin. An O-ring is arranged on the outer circumference of a core(130). The outer circumference of a plunger(140) is coated with Teflon or molybdenum.

Description

Small solenoid device {a small size solenoid device}

The present invention relates to a small solenoid device, and more particularly, to a small solenoid device used in a shift lock device of a shift lever of a vehicle and improving in quality and economy.

In general, the solenoid device is a solenoid made of winding the wires tightly and uniformly in a tubular or screw shape, and is used as an electromagnet because a magnetic field is generated inside the current flowing through the coil, and per unit length to increase the strength of the magnetic field. The number of turns of the coil is increased or an iron core is provided inside the coil.

In addition, the solenoid device is applied to the operation of a valve or a lever by the action of an electromagnet, and is used in various areas including a valve device, a mechanical device, a shift lock device of a shift lever of a vehicle, and the like.

Here, the shift lock device is also referred to as a gear shift lock, and is a safety device in which a shift lever does not operate unless the brake pedal is pressed, and various devices are known.

Hereinafter, a solenoid device used in a conventional shift lock device will be described with reference to the accompanying drawings.

1 is a cross-sectional view showing a conventional solenoid device.

As shown in FIG. 1, the conventional solenoid device 20 includes a bobbin 5 wound around a coil 6 through which a current flows so that a magnetic field is formed inside the bracket 1. A core (fixed iron core, 2) is fixed to one inner side and a plunger (movable iron core, 10) is provided on the other side, which is moved by the action of an electromagnet due to the formation of the magnetic field. In addition, a damper (8) is provided at one side of the core (2) for restoring the collision between the core (2) and the plunger (10) is provided with a spring 12 for applying a restoring force to the plunger (10) when the power is turned off And a buffer ring 9 for alleviating the collision between the plunger 10 and the bracket 1, and a shaft 11 for dualization such as locking or releasing by linear movement.

Therefore, the conventional solenoid device 20 is composed of a structure of the movable core 10 and the fixed iron core (2) and by the magnetic field generated by the electric current applied to the coil (6) and the fixed iron core ( 2) is operated to be sucked in the linear motion of the movable core 10 by the attraction force generated by magnetization of the electromagnet. Upon return, the current is interrupted and the magnetic field disappears and is operated by the elastic recovery of the spring 12 assembled so that the plunger 10 and the core 2 are separated.

At this time, the conventional solenoid device 20 used in the shift lock device of the vehicle is smooth movement due to the contact between the metal plunger 10 and the core 2 in order to improve the reliability of the product through low noise according to the operation Grease was applied to the outer surface of the plunger 10 so as to prevent metal noise and a damper 8 and a buffer ring 9 were provided. In addition, it was necessary to have a cover 4 covering the opening of one side of the bracket 5 so as not to leak the lubricant.

Therefore, the conventional solenoid device 20 has the following problems.

First, it is almost impossible to constantly adjust the amount of grease applied to the outer surface of the plunger 10, thereby lowering the consumer's confidence in the quality of the product due to the noise difference caused by the amount of grease. There was a problem that there is a limit in heat resistance and cold resistance.

Second, there is a limit to reduce the manufacturing cost of the solenoid device by the damper (8) and the damping ring (9) for noise prevention, and the cover (4) for preventing leakage of lubricant, and the product is heavy and relatively bulky. According to the present invention, installation is not easy and securing a space for a shift lever design has been difficult.

Third, the void volume due to elastic expansion of the spring 12 provided inside the bobbin 5 is increased during non-magnetization so that one of the core 2 and the plunger 10 using the ferromagnetic material (free cutting steel, pure iron) Since it must have a relatively long length there was a problem that prevents the improvement for the reduction of the manufacturing cost.

In order to solve the above problems, the present invention utilizes pneumatic resistance and magnetic force reduction which reduces the moving speed of the plunger so as to minimize the impact of the plunger contacting the core with the damper, so that the operation noise is reliably prevented. It is an object of the present invention to provide a compact solenoid device that improves quality and improves economics due to cost reduction due to weight reduction and miniaturization by reducing the number of parts by coating treatment and external spring for friction reduction of the plunger.

In order to solve the above problems, the present invention is a bracket having openings on both sides; A bobbin provided inside the bracket and having a coil wound on an outer surface thereof so as to selectively magnetize a through hole formed therein; A hollow sleeve provided inside the through hole formed inside the bobbin; A core fixed to a lower portion of the sleeve and provided with an O-ring to close a gap between the sleeve and a coupling groove formed along an outer circumference to block air flow; When the coil is energized, a pneumatic damping action is carried out in close contact with the inner surface of the sleeve to the closed space on the core side, and the outer circumferential surface is coated to reduce the frictional force, but does not require a separate lubricant inside the sleeve. A plunger provided to guide the movement; And a spring fixed to the outside of the bracket and provided to elastically act in a direction in which the plunger returns when the coil is not energized.

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Here, the upper end portion of the core and the lower end portion of the plunger are formed in the inclined portion and the planar portion corresponding to each other so as to increase the contact area, the planar portion is preferably provided with a damper of the soft material absorbing the impact. In addition, the outer circumferential surface of the plunger is coated with one of Teflon coating and molybdenum coating to reduce friction, and the sleeve is preferably made of brass. Furthermore, the plunger is preferably tapered so that the upper part of the plunger is spaced apart from the upper end of the bracket to reduce the magnetic force during the movement of the coil. And, the plunger is preferably provided with a synthetic resin material so that the upper portion of the magnetic force to interact with the upper end of the bracket when the movement according to the energization of the coil.

Through the above solution, the small solenoid device of the present invention provides the following effects.

First, the present invention tapered the upper part of the plunger for the reduction of the magnetic force and the O-ring to generate a resistance by the compression of air to reduce the acceleration in close proximity to the core of the plunger, thereby minimizing the impact on the damper Since the impact noise of the plunger and core is reliably prevented, the quality of the product can be significantly improved. Accordingly, the reliability of the consumer can be remarkably improved by excluding a doubt about the consumer's product due to the operation noise.

Second, the outer surface of the plunger is coated with Teflon coating or molybdenum instead of the conventional grease, and the spring is provided as an external type fixed to the outside of the bracket rather than the conventional internal type, so that the existing cover and the buffer ring are unnecessary and both sides of the bracket are opened. As the structure is lighter in weight and smaller in size, it is easy to install and the economics due to reduction of manufacturing cost can be significantly improved. In addition, since the space for the shift lever design of the vehicle is secured by the miniaturization of the product, the freedom of designing other components can be improved.

Third, since the core and the plunger are provided with the inclined portion and the flat portion corresponding to each other, the attraction force of the core and the plunger are gradually increased so that the plunger moves quickly, thereby improving the operation response of the product.

Fourth, the plunger is provided with an upper part as an injection material or tapered to reduce its acceleration in the vicinity of the contact with the core, thereby reducing and adjusting the magnetic force at the contact of the plunger and the core, thereby substantially reducing the impact force between the plunger and the core, thereby reducing the impact noise. Of course, the durability of the product can be significantly improved.

Hereinafter, a small solenoid device according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

Figure 2 is a side cross-sectional view showing a power off state of the small solenoid device according to an embodiment of the present invention, Figure 3 is a bottom view of the small solenoid device according to an embodiment of the present invention. In addition, Figure 4 is a side cross-sectional view showing a power applied state of the small solenoid device according to an embodiment of the present invention.

As shown in Figures 2 and 3, the small solenoid device 200 according to an embodiment of the present invention comprises a bracket 110, bobbin 120, core 130 and plunger 140.

In detail, the bracket 110 is preferably made of a rectangular parallelepiped shape that is easy to install in order to install the inside of the vehicle with one touch, the opening is formed to open the opposite sides of the longitudinal direction for material reduction and light weight, one side open A connector 180 of plastic material is provided to protect the terminal 125 through the unit. In addition, the bracket 110 is composed of a body yoke 111 and a cover yoke 113, the cover yoke 113 is formed after fitting the bobbin 120 to the 'Y' shaped body yoke 111 It restrains the upper end of the bobbin 120 and is fitted to the upper end of the body yoke 111. The body yoke 111 and the cover yoke 113 is made of a metal material for durability of the product, and is manufactured by press working, which is a well-known technique for convenience of manufacturing.

On the other hand, the bobbin 120 is provided on the inside of the bracket 110, the bobbin 120 is wound around the coil 123 to the outer surface so that the through-hole 121 formed therein is selectively magnetized.

Here, the bobbin 120 is preferably made of a cylindrical shape penetrating the central portion in the longitudinal direction, it is made of a plastic material for weight reduction. Both ends of the bobbin 120 extend along the circumference to restrain the coil 123 being wound, and a terminal 125 to which a wire (not shown) for supplying power to the coil 123 is connected to one side of the extended portion. ) Is provided.

The bobbin 120 is fixed to the bracket 110 so that the core 130 is inserted into the through hole 121 and the cover yoke 113 is coupled to the bracket 110 by constraining the upper surface thereof. do.

On the other hand, the core 130 is fixed to one opening of the through hole 121, the core 130 is an O-ring to block the flow of air in the coupling groove 131 formed along the outer periphery 135).

Here, the core 130 is preferably made of a cylindrical ferromagnetic material (for example, free-cutting steel or pure iron), in order to have a large area of the magnetic field smoothly, the upper contact portion is tapered in the shape of the upper and lower light in cross section, and the lower end is fixed. It is fixed to the bracket 110 to serve as an iron core.

In addition, an O-ring 135 is provided on an outer circumferential surface of the core 130 to block the air flow and to have a compression effect by minimizing the flow of air in the inner hollow portion of the through-hole 121. The O-ring 135 Silver refers to a ring made of nitrile rubber or other materials having a circular cross section (O type), and preferably made of synthetic rubber.

Therefore, an O-ring 135 is provided on the outer circumferential surface of the core 130 to block air flow downward for pneumatic speed control according to suction movement of the plunger 140. Through this, by improving the noise prevention structure that was dependent only on the existing damper has a certain noise prevention and shock-absorbing structure can be significantly improved product quality.

On the other hand, the plunger 140 is provided in the other opening of the through hole 121 and moved to be in contact with the core 130 when the coil 123 is energized. Is coated for and is fixed to the outside of the bracket 110 on the top is provided with a spring 145 elastically acts to return when the coil 123 is not energized.

Here, the plunger 140 is preferably made of the same ferromagnetic material as the core 130 so as to have a cylindrical shape movable through the through hole 121 and to facilitate the magnetic coupling according to the magnetization. That is, the plunger 140 serves as a moving core.

And, the outer circumferential surface of the plunger 140 is made of one of the Teflon coating and molybdenum coating so that the frictional force is reduced, the outer sleeve of the plunger 140, the brass sleeve 190 for guiding the movement of the plunger 140 is It is preferred to be provided.

That is, the plunger 140 reduces the frictional force of the outer circumferential surface due to the movement of the plunger 140 on the outer circumferential surface, and improves the difficulty of controlling the amount of grease that has been previously used for smooth movement and noise prevention. It is applicable to Teflon coating or molybdenum coating with excellent heat and cold resistance and extremely low coefficient of friction.

Therefore, the outer surface of the plunger 140 is made of Teflon coating or molybdenum coating having the same frictional force reducing effect as conventional grease. As a result, the plunger 140 is smoothly moved, as well as the cover for accommodating the existing lubricant (see 4 in FIG. 1) and the buffer ring (see 9 in FIG. 1) accordingly is eliminated to reduce the size and weight of the product. Can be.

In addition, the sleeve 190 has a cylindrical rim shape so as to be provided in the through hole 121 formed inside the bobbin 120 made of synthetic resin for durability and accuracy of operation by contact between metals. The core 130 is disposed and the plunger 140 is arranged to move in close contact.

As described above, the core 130 and the plunger 140 have a gap with the inner surface of the sleeve 190, and the core 130 is closed by the O-ring 135. Therefore, since the resistance force of the air in the inner space of the through hole 121 is compressed in the vicinity of the plunger 140 is in contact with the core 130 during the suction movement, the plunger 140 is substantially for impact relief Speed control to reduce the speed at the contact portion with the core 130 by the pneumatic pressure is possible.

Specifically, as the plunger 140 is moved, air existing in the space between the plunger 140 and the core 130 may not move to the rear side by the O-ring 135 and the plunger 140 and the sleeve 190 may not be moved. As it is only communicated through the gap of the moment is compressed to generate a resistance to the movement of the plunger 140, the air existing in the space between the plunger 140 and the core 130 acts as a damper (damper) to the plunger ( 140 may attenuate noise due to an impact generated by hitting the core 130.

On the other hand, the upper end of the core 130 and the lower end of the plunger 140 increases the contact area in close proximity to each other to circulate on a large surface of the magnetic field to minimize the power consumption and quickly operate the plunger 140 in a low current state In order to make the inclined portion 13 and the flat portion 14 corresponding to each other to be made, the contact is formed, either side of the flat portion 14, damper 149 of the soft material absorbing the impact to reduce noise ) Is preferably provided to protrude so that the buffer force is increased.

That is, referring to FIG. 4, when the plunger 140 is close to the core 130 during magnetization, the magnetic field circulates smoothly on the contact surface between the plunger 140 and the core 130, thereby, The attractive force of the core 130 allows the plunger 140 to move quickly with maximum efficiency up to the desired stroke. Of course, the upper end portion of the core and the lower end portion of the plunge may be formed with different structures from each other, and the damper may be provided on the core side.

Therefore, the present invention reduces the magnetic resistance (Rm) generated between the plunger 140 and the core 130 during operation of the plunger 140 for the rapid operation of the plunger 140, the plunger 140 ) And the core 130 are formed to correspond to the inclined portion 13 and the flat portion 14, respectively. As a result, the attraction force between the plunger 140 and the core 130 is gradually increased during magnetization, so that the plunger 140 is quickly moved until the core 130 contacts, thereby improving the operation response of the product.

On the other hand, the upper portion of the plunger 140, the shaft (shaft, 160) for locking and unlocking the shift lever is interpolated, the protective cap 170 for protecting the components such as the spring 145 exposed to the outside Is combined. Of course, small solenoid devices without protective caps are also possible.

On the other hand, Figure 5 is a perspective view showing the main part of the small solenoid device according to an embodiment of the present invention, Figure 6 is a magnetic force according to the change in the impact distance of the plunger in the small solenoid device according to an embodiment of the present invention The change is compared with the conventional solenoid apparatus.

As shown in Figure 1 and 5, the plunger 140 is preferably tapered so that the upper part is spaced apart from the upper end of the bracket 110 when the movement according to the energization of the coil 123 to monitor the magnetic force. .

To this end, the plunger 140 Tapered to the upper and lower beams from the head portion (140a) and the head portion (140a) coupled to the fixing groove (147a) formed along the outer periphery and restraining the restraining member (147) restraining the upper end of the spring (145) It is preferably made to include a neck portion 140b extending.

Here, the restraining member 147 is provided to intercept the spring 145 of the small solenoid device 200 having the shaft 160, the opening 147b having one side open for assembly convenience and component replacement. It is made to be selectively detachable to the fixing groove 147a formed on the outer circumferential surface of the plunger 140 through, a plurality of fixing protrusions (147c) protruding at regular intervals fitted into the fixing groove 147a is provided on the inner circumference. This is preferred.

Specifically, in the small solenoid device 200 of the present invention, when power is applied to the coil 123, the plunger 140 is caused by an attraction force generated by magnetizing the plunger 140 and the core 130 by an induced magnetic field. Is moved to the core 130 side, and when the power is cut off, the magnetic force is lost, and the plunger 140 is operated by a mechanism in which the spring 145 is restored to its original position.

At this time, when the power is applied, the air gap inside the through hole 121 according to the change of the collision distance S of the plunger 140, that is, the stroke (S), is reduced, so that the plunger 140 and the core ( Excessive suction force is generated in the full stroke (A) section, which is close to 130, to reduce the durability of the device, such as component damage, which shortens the life of the damper 149 due to excessive shock.

In order to solve this problem, the present invention generates a gap between the plunger 140 and the cover yoke 113 of the bracket 110 in the full stroke section A during the movement of the plunger 140 so that the magnetic force is leaked. By reducing the suction force (F) at the contact of the plunger 140.

In addition, Figure 6 (a) is a graph showing a change in suction force (F) according to the change in the collision distance (S) of the plunger in the conventional solenoid device, Figure 6 (b) is a small solenoid device of the present invention It is a graph showing a change in suction force (F) according to the change of the collision distance (S) of the plunger.

Here, the suction force F (gf) refers to the attraction force by the magnetic force between the plunger 140 and the core 130, the collision distance (stroke) S (mm) is the lower end and the core of the damper 149 provided in the plunger 140 The distance between the planar portions 14 of 130 is referred to. Of course, Figures 6 (a) and 6 (b) are graphs of values measured under the same conditions (for example, the number of turns of the coil, the applied voltage, etc.).

As shown in (a) and (b) of FIG. 6, the small solenoid device 200 of the present invention has a plunger 140 and a core (compared to the suction force F of the full stroke section A in the conventional solenoid device). 130 is tapered in the adjacent full stroke section A '. Due to the gap with the bracket 110 formed by the plunger 140, the magnetic force is leaked and the suction force F It can be seen that the sharp decrease.

Therefore, the small solenoid device 200 of the present invention more reliably alleviates the impact of the plunger 140 and the core 130 even if the moving acceleration of the plunger 140 is increased to improve the response, thereby improving noise prevention and durability. As well as lightening and cost reduction according to the partial deletion of the plunger 140 can be expected.

7 is a side sectional view showing a small solenoid device 400 according to another embodiment of the present invention.

Since the basic configuration except for the plunger of the present embodiment is the same as the above-described embodiment, a detailed description thereof will be omitted.

A characteristic of the present embodiment is that the plunger (in the full stroke section (see A ′ in FIG. 6)) is a section in which power is applied for the impact prevention and durability, and the plunger 540 and the core 130 are close when the plunger 540 moves. The nonmagnetic material 543 made of plastic is coupled to the upper portion of the plunger 540 to cancel the magnetic force between the 540 and the bracket 110 to reduce the suction force F of the plunger 540.

That is, as shown in Figure 7, the plunger 540 is preferably provided with a synthetic resin material so that the upper portion of the magnetic force to interact with the upper end of the bracket 110 during the movement according to the energization of the coil 123. Thereby, the change of the suction force F as shown in FIG.6 (b) can be expected.

Therefore, the plunger 540 is composed of a combination of a ferromagnetic material 541 and a nonmagnetic material 543, the coupling of the combination may be applied to various methods such as bonding, screwing. Further, as shown, the boundary of the combination is such that the lower end of the nonmagnetic material 543 is matched to the lower end of the cover yoke 113 when the plunger 540 contacts the core 130.

As described above, the plunger 140, 540 is tapered at the top or provided with a synthetic resin to reduce its acceleration in the vicinity of the contact with the core 130, thereby contacting the plunger 140, 540 with the core 130 When the magnetic force is reduced and adjusted substantially, the impact force of the plungers 140 and 540 and the core 130 is substantially reduced, thereby preventing shock noise and significantly improving durability of the product.

On the other hand, Figure 8 is a side cross-sectional view showing a small solenoid device 600 according to another embodiment of the present invention.

Since the basic configuration except for the rod of the present embodiment is the same as the above-described embodiment, a detailed description thereof will be omitted.

A feature of this embodiment is characterized by the use of a rod 560 to lock the shift lever in conjunction with the shaft in order to widen the range of use of the small solenoid.

That is, as shown in Figure 8, the upper portion of the plunger 540 is provided with a rod 560 is coupled to the other member in the inner hole for locking and unlocking the shift lever. Therefore, when the rod 560 is provided, the spring 145 is restrained and fixed to the lower end of the rod 560 and the upper end of the cover yoke 113.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation process and operation effects of the small solenoid device according to an embodiment of the present invention.

As shown in Figures 2 and 4, the small solenoid device 200 according to the present invention is a dual-actuated device that is moved up and down for the selective operation of the shift lever of the vehicle and by the electric field generated in the coil 123 When the plunger 140 is suction-moved into the through hole 121 and the electric field is removed from the coil 123, the plunger 140 returns to its original position by the elastic force of the spring 145.

Specifically, a vehicle employing an automatic transmission includes a shift lock that prevents the lever from moving according to vehicle driving conditions and conditions to prevent driver misoperation, vehicle running stability, and system protection when the shift lever of the automatic transmission is to be moved. shift lock) function, which uses the small solenoid device 200 of the present invention to lock and unlock the shift lock.

First, referring to FIG. 4, when a driver presses a brake pedal to move a shift lever, when a current is supplied to the coil 123, the through hole 121 is magnetized to form a magnetic plunger 140 and a core 130. The magnetic force is exerted and the plunger 140 moves toward the fixed core 130 by mutual attraction. That is, the plunger 140 becomes a moving iron core and the core 130 becomes a fixed iron core.

At this time, since the inclined portion 13 and the flat portion 14 corresponding to each other are formed in the plunger 140 and the core 130 for rapid operation, the contact cross-sectional area between the plunger 140 and the core 130 is widened. . In addition, the spring 145 is provided on the outside of the bracket 110 to minimize the gap between the plunger 140 and the core 130. Accordingly, the plunger 140 moves as quickly as possible.

Moreover, the rapidly moving plunger 140 is compressed by the O-ring 135 at the time of impact with the core 130 (see full stroke section A 'in FIG. The speed is significantly reduced by the suction force F, which is reduced due to the treatment, so that the impact noise with the core 130 is not generated by the damper 149. Accordingly, the small solenoid device 200 is used in a very quiet state to improve the quality of the product, and ultimately, it is possible to extend the life of the small solenoid device 200 through impact prevention.

4 and 2, when supply of current to the coil 123 is stopped, the plunger 140 returns to its original position by the restoring force of the spring 145 elastically compressed from the outside of the bracket 110. At this time, it is small in the state that the brake lever is not pressed Since the solenoid device 200 is made non-energized, power can be saved.

As described above, the present invention has an upper portion of the O-ring 135 for generating a resistance by the compression of air to reduce the acceleration in proximity to the core of the plunger 140 and the top of the plunger 140 for reducing the magnetic force By the taper treatment, the impact on the damper 149 is minimized, so that the impact noise of the plunger 140 and the core 130 can be reliably prevented, so that the quality of the product can be significantly improved. Accordingly, the reliability of the consumer can be remarkably improved by excluding a doubt about the consumer's product due to the operation noise.

In addition, the outer surface of the plunger 140 is coated with Teflon or molybdenum instead of the conventional grease and the spring 145 is provided in an external type fixed to the outside of the bracket 110 rather than the conventional built-in type.

Through this, the existing cover (see 4 of FIG. 1) and the buffer ring (see 9 of FIG. 1) is unnecessary, and the structure is easy to install and lighter and smaller as the structure is opened on both sides of the bracket 110, and the manufacturing cost is reduced. Economics due to this can be significantly improved. In addition, the free space for designing the shift lever of the vehicle can be secured by the miniaturization of the product, and thus the freedom of designing other components can be improved.

As described above, the small solenoid device according to the preferred embodiment of the present invention is not limited to each of the above-described embodiments, and the general knowledge in the technical field to which the present invention belongs without departing from the scope of the claims of the present invention. It is possible to carry out modification by the exciter, and such modifications are within the scope of the present invention.

1 is a side cross-sectional view showing a conventional solenoid device.

Figure 2 is a side cross-sectional view showing a power off state of the small solenoid device according to an embodiment of the present invention.

Figure 3 is a bottom view of a small solenoid device according to an embodiment of the present invention.

Figure 4 is a side cross-sectional view showing a power applied state of the small solenoid device according to an embodiment of the present invention.

Figure 5 is a perspective view showing the main part of a small solenoid device according to an embodiment of the present invention.

6 is a view comparing the change in suction force according to the change in the collision distance of the plunger in the small solenoid device according to an embodiment of the present invention compared with the conventional solenoid device.

Figure 7 is a side cross-sectional view showing a small solenoid device according to another embodiment of the present invention.

Figure 8 is a side cross-sectional view showing a small solenoid device according to another embodiment of the present invention.

<Description of Symbols for Main Parts of the Present Invention>

200: small solenoid device 110: bracket

120: bobbin 121: through hole

123: coil 130: core

131: coupling groove 135: O-ring

140: plunger 140a: head portion

140b: neck 145: spring

147a: fixing groove 147: restraining member

149: damper 160: shaft

170: protective cap 190: sleeve

13: inclined portion 14: flat portion

Claims (5)

Brackets are formed on both sides; A bobbin provided inside the bracket and having a coil wound on an outer surface thereof so as to selectively magnetize a through hole formed therein; A hollow sleeve provided inside the through hole formed inside the bobbin; A core fixed to a lower portion of the sleeve and provided with an O-ring to close a gap between the sleeve and a coupling groove formed along an outer circumference to block air flow; When the coil is energized, a pneumatic damping action is carried out in close contact with the inner surface of the sleeve to the closed space on the core side, and the outer circumferential surface is coated to reduce the frictional force, but does not require a separate lubricant inside the sleeve. A plunger provided to guide the movement; And Small solenoid device is fixed to the outside of the bracket, comprising a spring provided to elastically act in the direction in which the plunger is returned when the coil is not energized. The method of claim 1, The upper end of the core and the lower end of the plunger is inclined and the planar portion corresponding to each other so as to increase the contact area, the flat solenoid device characterized in that the damper of the soft material to absorb the shock. The method of claim 1, The outer circumferential surface of the plunger is coated with one of the Teflon coating and molybdenum coating so as to reduce the frictional force, the sleeve is characterized in that the sole is provided with a brass material. The method of claim 1, The plunger is a small solenoid device, characterized in that the upper portion is tapered to reduce the magnetic force is spaced apart from the upper end of the bracket when moving according to the energization of the coil. The method of claim 1, The plunger is a small solenoid device, characterized in that the upper portion is provided with a synthetic resin material so that the magnetic force to interact with the upper end of the bracket when moving according to the energization of the coil.

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