Spring retainer for actuator for improving noise with dual structure

Abstract

The present invention relates to a spring holder for an actuator for improving noise with a dual structure, and more particularly, to a spring holder for an actuator for improving noise with a dual structure in which an absorbing layer different from a metal spring material is integrally formed on the outer peripheral surface of a body made of a metal material, a spring guide of a rack is inserted into the body, and a spring guide of the rack is inserted into the body. The outer peripheral surface of the absorbing layer is embedded and combined with the spring, so that when the actuator operates, the spring and the absorbing layer are made of different materials, and therefore impact, vibration and noise generated during friction are absorbed and buffered.

Description

Technical Field

[0001] The present invention relates to a spring retainer for an actuator with a double structure for improving noise. The spring retainer for an actuator of the present invention has a double structure in which an absorption layer of a material different from that of a spring of a metal material is integrally formed on the outer peripheral surface of a body of a metal material. A spring guide with a rack is inserted into the body, and a spring is embedded and combined on the outer peripheral surface of the absorption layer. When the actuator is running, the materials of the spring and the absorption layer are different, thereby absorbing and buffering the impact, vibration and noise during friction. Background Art

[0002] Generally, the opening and closing of various valves are completed automatically or manually. In contrast to smaller-sized valves that are manually operated, large-sized valves or valves installed in places where direct operation is inconvenient are mostly operated automatically.

[0003] The valve operating parts of the automatic opening and closing valve are driven by electric actuators using solenoids and pneumatic actuators using air or the like.

[0004] On the one hand, the rack and pinion actuator in the pneumatic actuator is in the shape of a linear rod, including: a piston with serrations formed along the length direction on one side, a rack formed integrally with a spring guide on the other side, and a pinion as a circular sawtooth gear. The rack and pinion mesh with each other to convert linear motion into rotational motion.

[0005] Therefore, in the rack and pinion actuator, the rack is linearly moved by air pressure, and the pinion coupled to the valve shaft meshes with the serrations of the piston formed on the rack and performs rotational motion, thereby being used to automatically control and operate mechanical devices such as valves and dampers.

[0006] The rack and pinion actuator is in a state where the housing and the side covers on both sides of the housing are respectively combined, the pinion is located in the center of the housing, the rack is located oppositely on both sides of the pinion, the piston formed at the front end of the rack is in a state of meshing with the pinion, a cylindrical spring retainer is inserted into the outer circumferential surface of the spring guide located on the other side, and when the spring is inserted into the outer circumferential surface of the spring retainer, one end of the spring is located at a position inserted into the fixing groove formed in the side cover.

[0007] During operation of the rack and pinion actuator, when the pinion and the piston formed on the rack are in serration meshing, and the rack is linearly reciprocated by air pressure, if the rack moves toward the side cover, then when the compression spring inserted in the spring guide is squeezed, the rack returns in the direction of the pinion by the elastic force of the spring while the air pressure is blocked.

[0008] On the other hand, the spring retainer inserted between the spring guide and the spring has a spring guide function, enabling the spring to always return at the same pitch while the air pressure is blocked in a state where the spring is compressed by the output of the air pressure.

[0009] The spring retainer is made of different materials depending on the output value of the air pressure, and generally two types of materials are used: nylon and metal.

[0010] The nylon spring retainer is mainly used when the output value of the air pressure is small. Due to its low friction coefficient with metal, it has the advantage of less impact, vibration and noise. However, it is not as strong as the metal spring retainer and has the problem of low durability.

[0011] In addition, if Figure 1 As shown, the spring retainer made of metal is mainly used when the output value of the air pressure is large. Due to the high friction coefficient between the spring and the metal material, there are many problems of generating impact, vibration and noise.

[0012] However, since metal spring retainers have the advantage of being stronger than nylon spring retainers, they are mainly used.

[0013] In addition, metal foreign matter generated by the friction between the metal spring retainer and the spring is the main reason that hinders the stability of mechanical operation. The problem of metal foreign matter is a fatal factor that shortens the life of the actuator sealing component (O-ring). The actuator operated by air pressure not only has major problems such as failure to operate when the sealing component is engaged, but also has the problem of scratches on the metal parts due to the friction between the spring retainer and the spring.

[0014] Prior art literature

[0015] Patent Literature

[0016] Korean Patent Application No. 10-2011-0100654 “Linear Actuator” Summary of the invention

[0017] Issues to be resolved

[0018] The spring retainer of the present invention for solving the above-mentioned problems aims to reduce the friction coefficient with the metal spring when the actuator is in operation, to cushion and reduce the impact, vibration and noise, and to improve the firmness and durability.

[0019] Solution to the problem

[0020] As a means of solving the above-mentioned problem, the present invention provides a spring retainer for an actuator with a double structure to improve noise, characterized in that the spring retainer for an actuator includes: a cylindrical body made of a metal material; and a supporting end protrusion supporting a spring at an edge position on one side of the body, and a polymer is bonded to the outer peripheral surface of the body to form an absorption layer integrally.

[0021] Effects of the Invention

[0022] As described above, the actuator spring retainer of the present invention has a polymer bonded to the outer peripheral surface of the metal spring retainer to form a double structure with an absorption layer. The friction coefficient is reduced by making the materials different, which has the effect of buffering and reducing impact, vibration and noise while improving firmness and durability.

[0023] Therefore, the absorption layer and the spring of the spring retainer made of different materials have a low friction coefficient during sliding operation, which can minimize the generation of metal foreign matter and noise generated during friction, thereby preventing the operation of the actuator and damage to the O-ring located inside, which has the effect of extending the life of the actuator.

[0024] The polymer has the effect that a variety of materials including synthetic resins, plastics, and resins can be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. 1 is a cross-sectional view showing a conventional spring retainer.

[0026] Figure 2 It is a perspective view showing the spring retainer of the present invention.

[0027] Figure 3 It is a cross-sectional view showing the spring retainer of the present invention.

[0028] Figure 4 This is a cross-sectional view showing that a spring guide absorbing layer is formed in the spring retainer (general type) of the present invention.

[0029] Figure 5 This is a cross-sectional view showing that a spring guide absorbing layer is formed on the spring retainer (bonding site polymer type) of the present invention.

[0030] Figure 6 This is a front view showing a state where the spring retainer of the present invention is coupled to an actuator.

[0031] Figure 7 It is a cross-sectional view showing the operating state of the spring retainer of the present invention.

[0032] Figure 8 It is a front view showing another embodiment of the spring retainer of the present invention.

[0033] Reference numerals

[0034] 1: Actuator 2: Housing

[0035] 3: Side cover 4: Pinion

[0036] 5: Rack 6: Spring guide

[0037] 7: Spring 8: Body

[0038] 9: Bonding hole 10: Embossing (knuriling)

[0039] 11: Absorption layer 12: Support end protrusion

[0040] 13: Spring retainer 14: Guide hole DETAILED DESCRIPTION

[0041] In order to achieve the above-mentioned purpose and effect, the present invention is described in detail below with reference to the accompanying drawings.

[0042] Figure 2 To illustrate a perspective view of a spring retainer of the present invention, Figure 3 To illustrate a cross-sectional view of a spring retainer of the present invention, Figure 4 This is a cross-sectional view showing that an absorbing layer is formed in the spring holder (general type) of the present invention.

[0043] The actuator spring retainer 13 of the present invention includes: a body 8 made of metal and formed in a cylindrical shape; a support end protrusion 12, which is bent toward the outside at the edge of one side end of the body 8 to support the spring 7; and a spring guide hole 14, which is bent toward the inside at the other side end of the body 8 to introduce and lead out the spring guide 6.

[0044] The spring retainer 13 has a polymer bonded to the outer peripheral surface of the body 8 made of metal, thereby forming a double structure having an absorption layer 11 and a double structure in which the material of the portion in contact with the spring 7 is different.

[0045] Therefore, the spring retainer 13 has a dual structure. The main body 8 which is the non-contact part with the spring 7 is made of metal material, and has excellent firmness and durability. The absorption layer 11 which is in contact with the spring 7 is formed of an absorption layer 11 using a polymer material to minimize friction loss.

[0046] In addition, bonding holes 9 are arranged at regular intervals on the surface of the main body 8 so that the outer peripheral surface and the inner peripheral surface are connected, and the bonding holes 9 absorb and solidify the polymer.

[0047] The reason why the through-bonding holes 9 are arranged in the main body 8 as described above is to maintain a firmly fastened state with the main body 8 when the polymer is inserted into the bonding holes 9 and fixed through the curing process during the process of forming the absorbent layer 11 .

[0048] Therefore, a part of the polymer is inserted into the bonding hole 9, and the bonded absorption layer 11 is maintained in a firmly fastened state during the friction with the spring 7 when the actuator 1 is operated.

[0049] The polymer is a material with excellent wear resistance, heat resistance and fire resistance, and has the characteristics of low friction coefficient. When rubbing with the spring 7 made of metal material, it minimizes the generation of metal foreign matter, reduces the friction coefficient, cushions and reduces impact, vibration and noise, while improving firmness and durability.

[0050] Figure 5 This is a cross-sectional view showing that an absorbent layer is formed on the spring retainer (bonding site polymer type) of the present invention.

[0051] The spring retainer 13 has a polymer bonded to the surface of the body 8 including the inner peripheral surface of the spring guide hole 14 to form an absorption layer 11 , thereby reducing the friction coefficient with the outer side of the guide member 6 .

[0052] As described above, the reason why the absorption layer 11 is formed inside the guide hole 14 is that the material of the spring guide 6 is also made of metal. When the actuator is running, during the process of the spring guide 6 being combined with the guide hole 14 and introduced and led out, the polymer is adsorbed to wrap the inner circumferential surface of the guide hole 14, thereby reducing the friction coefficient of the inner side of the guide hole 14, cushioning and reducing impact, vibration and noise.

[0053] On the one hand, the polymer preferably uses a synthetic resin, a plastic, or a resin.

[0054] Figure 8 It is a front view showing another embodiment of the spring retainer of the present invention.

[0055] The body 8 of the spring retainer 13 is formed with knuriling 10 on its surface.

[0056] The embossing 10 is mainly for anti-slip purpose. After forming transverse or inclined serrated grooves on the surface of the cylindrical body 8, a polymer is formed into an absorption layer 11 with a certain thickness or more. The polymer is inserted into the serrated grooves and maintains a firmly bonded state through a curing process.

[0057] The polymer is inserted into the embossed knurls 10 and maintained in a firmly bonded state, thereby preventing the spring retainer 13 from being separated when the spring 7 moves in the left-right direction together.

[0058] In addition, the absorption layer 11 is integrally formed with the body 8 of the spring holder 13 to prevent the metal parts including the spring 7 from being scratched.

[0059] Figure 6 This is a front view showing a state where the spring retainer of the present invention is combined with an actuator. Figure 7 It is a cross-sectional view showing the operating state of the spring retainer of the present invention.

[0060] An embodiment of the present invention is described as follows: a rack and pinion actuator 1 is combined with a housing 2 and side covers 3 are respectively combined on both sides of the housing 2, and a pinion 4 is located at the center of the housing 2; a rack 5 is oppositely located on both sides of the pinion 4, a piston formed at the front end of the rack 5 is in meshing with the pinion 4, a cylindrical spring retainer 13 is inserted into the outer circumferential surface of a spring guide 6 located on the other side, and a spring 7 is inserted into the outer circumferential surface of the spring retainer 13, and one end of the spring 7 is located at a position inserted into a fixing groove formed in the side cover 3.

[0061] The operation of the rack and pinion actuator 1 is as follows: when the pinion 4 and the rack 5 are meshed, when the rack 5 is linearly reciprocating by air pressure, when the rack 5 moves toward the side cover 3, the compression spring 7 inserted in the spring guide 6 is in a squeezed state, and while the air pressure is blocked, the rack 5 operates in a manner of returning toward the pinion 4 by the elastic force of the spring 7. Due to the dual structure of the main body 8 of the spring retainer 13 being made of metal material and the absorption layer 11 being made of polymer material, the friction coefficient is reduced, and impact, vibration and noise are buffered and reduced.

Claims

1. A spring retainer for an actuator with a double structure to improve noise, characterized in that: The spring retainer (13) for an actuator includes: a body (8) formed integrally, which is a cylindrical shape of a metal material; a support end protrusion (12) which is bent toward the outside at one end of the body (8) to support a spring (7); and a spring guide hole (14) which is bent toward the inside at the other side of the body (8) to introduce and lead out a spring guide (6). The outer peripheral surface of the main body (8) is bonded with a polymer to integrally form an absorption layer (11).

2. The spring retainer for an actuator with improved noise by a double structure according to claim 1, characterized in that: The surface of the body (8) is provided with bonding holes (9) arranged at certain intervals so that the outer peripheral surface and the inner peripheral surface are connected, and the bonding holes (9) absorb and solidify the polymer.

3. The spring retainer for an actuator with improved noise by a double structure according to claim 1, characterized in that: The surface of the body (8) is formed with embossing (10).

4. The spring retainer for an actuator with improved noise by a double structure according to claim 1, characterized in that: The polymers include synthetic resins, plastics, and resins.

5. The spring retainer for an actuator with improved noise by a double structure according to claim 1, characterized in that: The spring retainer (13) has a polymer bonded to the surface of the body (8) including the inner peripheral surface of the spring guide hole (14), thereby reducing the friction coefficient with the outer side of the spring guide (6).

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