KR102140621B1 - Breakers with Low Noise Structure - Google Patents

Abstract

The present invention relates to a breaker having a low-noise structure, which comprises: a piston reciprocating by oil pressure in a cylinder including a back head in an upper part thereof; a chisel struck by the piston to crush an object to be crushed while descending with a predetermined stroke; a valve provided on the outside of a housing surrounding the cylinder so as to switch and supply high-pressure and low-pressure oil pressure for the piston to reciprocate vertically; and a strike noise insulation member surrounding an outer part of a struck area to insulate the noise generated when the piston strikes the chisel. Therefore, during the procedure of crushing the object to be crushed through a hydraulic breaker, a noise source which is generated when the chisel strikes the object to be crushed in response to the reciprocation of the piston performed over a vertical stroke distance of the piston as high-pressure and low-pressure oil pressure is switched and supplied into the cylinder, can be effectively blocked, and thus, the breaker can have an effect of reducing noises from spreading. Also, if a front-end part of the chisel crushing the object to be crushed by colliding with the piston is damaged and broken by repetitive strikes on the object to be crushed, only the front-end part of the chisel, which is a portion of the chisel, can be separated and replaced, and thus ease of maintenance work for the chisel and a subsequent cost reduction effect can be expected.

Description

Breakers with Low Noise Structure

The present invention relates to a breaker, in particular in a configuration in which a hydraulic breaker cylinder and a piston are provided and the chisel is connected to the lower side of the piston, a sound absorbing member is provided along an area impacted by the piston by the piston inside the hydraulic breaker cylinder. , A back head sound absorbing member is also formed on the upper surface side of the piston exposed to the upper back head of the hydraulic breaker, and the chisel is configured to be separable, and the chisel sound absorbing member is configured at a contact point that is separated and combined to generate the piston. It relates to a breaker having a low noise structure to reduce the noise and vibration generated in the process of hitting the chisel in contact with the shredded material.

In general, hydraulic breakers are mounted on construction equipment such as excavators and loaders, and are used when crushing work such as rock and concrete, demolishing buildings, or crushing crushed materials such as stone in the wild.

The hydraulic breaker is composed of a hydraulically operated front head, a cylinder back head, and a main body including a piston therein, and a chisel for protruding to the bottom of the main body to strike the crushed object is attached to the operation of the cylinder. As a result, the piston hits the chisel by vertical reciprocating motion, and the chisel transmits a strong impact force to the crushed object, so that the crushed object can be split or broken.

The noise generated during the operation of the hydraulic breaker, the sound generated when the piston strikes the chisel, the vibration sound generated by the piston and the chisel, and surrounding parts vibrating due to the strike, and the chisel will crush the shredded material. It can be classified as shattered sound generated when.

That is, when the piston strikes the chisel, a considerable blow sound is generated in the cylinder forming the hydraulic breaker, and a part of the blow sound propagates to the outside through the hydraulic breaker cylinder wall, and the other part is between the chisel and the upper bush, the chisel and the lower bush. It spreads through the niche.

In addition, due to the impact at the time of impact, the components such as the cylinder, bracket, and the like that constitute the piston, chisel, and hydraulic breaker vibrate to generate vibration noise.

Therefore, in order to reduce even the noise generated from the inside, the sound absorbing material such as mouth, tin, urethane, and mixed rubber is filled in the front head side where the piston hitting point is located, or the sound absorbing material is inserted into the piston to install the piston to strike the fracture. Various attempts have been made to absorb the noise generated during the time.

However, since such a conventional sound absorbing structure must have an expensive sound absorbing material, it leads to a cost increase, reduces the work efficiency by weighting the weight of the tool, and the sound absorbing effect decreases when moisture or the like penetrates depending on the work or storage environment. Not only was the life of the sound absorbing material shortened, but also the structural replacement of the sound absorbing material was not easy.

In addition, as one of the methods for reducing noise, in many cases, only the lower damper having a high hardness without a lower sound absorbing material was mounted on the lower portion of the hydraulic breaker cylinder, and a material having no elasticity was generally used even if the lower sound absorbing material was additionally mounted.

However, in the structure of a general hydraulic breaker, the location where the hitting part where the piston strikes the chisel and the crushed object are exposed is at the bottom of the breaker cylinder, and a lower damper with high hardness is installed at the location where noise and vibration by the hitting occurs most. By doing so, there was a problem in that it was difficult to obtain the effects of leakage noise shielding and vibration damping due to the spacing between parts and material properties.

Also known in the conventional low noise type hydraulic breaker, both the cylinder and the frame corresponding to the main body are configured in a box shape, and the cylinder, which is the main body, is configured to be spaced apart by a predetermined distance from the inner wall of the frame, and the space therebetween is various vibration damping and In some cases, the sound absorbing and sound-absorbing agents are filled so that the shock and vibration absorbed through the tool during work are not transmitted directly to the main body and the arm, but the noise generated by the impact of the piston and chisel is external. In order to prevent transmission, a cover or a sound absorbing material is installed in the surroundings, and it is absolutely impossible to reduce the noise generated by the piston and chisel itself.

Domestic patent registration No. 10-2073344 (announced on February 4, 2020) Domestic Patent Publication No. 10-2009-0063659 (published on June 18, 2009) Domestic Patent Publication No. 10-2010-0036724 (published on April 8, 2010) Domestic Patent Publication No. 10-2017-0095658 (published on August 23, 2017) Domestic Utility Model Publication No. 20-2020-0000073 (released on Jan. 8, 2020)

The present invention has been devised to solve the above-mentioned other problems, and is provided with a hitting and noise shielding member along an area impacted by a chisel by the piston inside a hydraulic breaker cylinder, and is provided on an upper back side head of the hydraulic breaker. A back head sound absorbing member is also formed on the upper surface side of the exposed piston, and the chisel is configured to be separable, but a chisel sound absorbing member is formed at a contact portion generated by separation and coupling, so that the piston strikes the chisel that is in contact with the crushed material. It is an object to provide a structure for reducing noise and vibration generated in a process.

The present invention for achieving the above object,

A piston that reciprocates by hydraulic pressure inside a cylinder having a back head on the top;

A chisel that is hit by the piston and descends in a predetermined stroke and crushes the object to be crushed;

A valve provided outside the housing surrounding the cylinder to switch and supply high and low pressure hydraulic pressure for reciprocating the piston up and down;

A hitting noise shielding member surrounding the outside of the hitting region to shield the noise generated when the piston hits the chisel; It provides a breaker having a low noise structure comprising a.

In addition, the present invention, a breaker having a low-noise structure comprising shielding noise propagating to the outside through the upper side of the cylinder by configuring the back-head sound absorbing member also on the upper surface side of the piston exposed to the upper back side of the hydraulic breaker. to provide.

In addition, the present invention is configured such that the chisel is separable, but a chisel sound absorbing member is formed on a contact portion to be separated and combined so that noise and vibration generated in the process of hitting the chisel in contact with the crushed object are reduced. It provides a breaker having a low noise structure, including those having a low noise structure for.

According to the present invention, in the process of crushing a crushed object using a hydraulic breaker, the chisel hits the crushed object corresponding to this by the reciprocating motion of the piston over the stroke of the piston up and down according to the provision of high and low pressure circulation of hydraulic pressure inside the cylinder. By effectively blocking the noise source generated when doing this, it has the effect of reducing the noise that spreads to the surroundings.

In addition, according to the present invention, when the front end side of the chisel that impacts the piston and crushes the crushed object is damaged or destroyed by repeated strikes with the crushed object, the chisel maintenance part is configured to be separated and replaceable only. Ease of operation and cost reduction can be expected.

1 is a schematic cross-sectional view of a breaker applied to the present invention
Figure 2 is an enlarged schematic view showing the coupling and separation state of the piston and the chisel structure provided in the cylinder and the inside thereof, and the hitting and noise shielding member for shielding noise generated when the piston hits the chisel in the present invention.
Figure 3 is a view showing a schematic cross-section of the state having a back head sound absorbing member toward the upper surface of the piston in the present invention
Figure 4 is a view showing another embodiment having a piston sound absorbing member toward the upper surface of the piston in the present invention
5 to 7 is a view showing each embodiment configured by separating the chisel in the present invention

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification are exemplified only for the purpose of explaining the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention Since it is possible to make various changes and have various forms, it includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention, and terms or words used in the specification and claims are conventional or dictionary Not to be construed as being limited to the meaning, the inventor can, on the basis that he can appropriately define the concept of terms in order to explain his or her invention in the best way, meaning and concept consistent with the technical idea of the present invention Should be interpreted as Therefore, the embodiments shown in the specification and drawings of the present invention are merely the most preferred embodiments of the present invention and do not represent all the technical spirit of the present invention, and are replaced at the time of filing the present invention. It should be understood that various equivalents and variations that can be made are possible or possible.

In addition, unless defined otherwise in the specification of the present invention, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention pertains. Have Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined herein. Does not.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The present invention, as described above, using the chisel 300 of the hydraulic breaker (1) to reduce the noise generated when performing the operation for crushing the crushed object, and also when the chisel 300 needs to be replaced It provides a configuration to facilitate the replacement of the tip portion side of (300).

In the present invention, in order to crush the shredded object by the chisel 300, the impact force is transmitted to the chisel 300 after the lower end of the piston 200 impacts the chisel 300, and at the same time, the tip end of the chisel 300 is shredded. It will be crushed by hitting.

In the process, a considerable noise is generated, and the part that is noticed as the source of the noise is a reciprocating motion up and down inside the cylinder 100 according to the switching of the hydraulic pressure at which the piston 200 is provided with high and low pressure, and the lower chisel 300 ) The noise generated when hitting the upper surface, the impact force is propagated to the top of the piston 200, the noise generated in the gas filling chamber 111 of the back head 110, and the chisel 300 is crushed It can be classified as noise generated when hitting.

In addition, the noise generated when the chisel 300 strikes the crushed object has a property propagated through the chisel 300.

First, the hydraulic breaker 1 adopted in the present invention has a configuration as shown in FIG. 1.

The hydraulic breaker (1) is provided with a cylinder (100) provided inside the housing (400), and a back head (110) filled with gas or the like at the top of the cylinder (100), to the hydraulic pressure inside the cylinder (100). By reciprocating piston 200 is provided.

On the other hand, the chisel 300 descending a certain stroke by the piston 200 and crushing through direct contact with the crushed object is provided inside the cylinder 100 in the state adjacent to the piston 200, but the chisel 300 The front end of the hydraulic breaker 1 is exposed to the lower end of the housing 400 constituting the outside.

In addition, the valve 500 is configured outside the cylinder 100 in order to control the supply of high and low pressure to the hydraulic pressure and control the vertical reciprocation of the piston 200.

In the present invention, in order to shield the noise generated when the piston 200 hits the chisel 300, the hitting noise shielding to surround the hitting area A where the piston 200 hits the chisel 300 The member 600 is constituted.

The hitting and noise shielding member 600 constitutes a seating portion 620 that protrudes inside the base member 610 and the base member 610 and incorporates the noise shielding member 630.

In addition, the insertion groove 120 is inserted into the outer surface of the cylinder 100 so that the seating portion 620 can be inserted through the outside of the cylinder 100 so as to be able to shield the hitting area A portion of the cylinder 100. ).

Therefore, the area of the insertion recess 120 is formed in the same position as the striking area (A).

On the other hand, through the housing 400 formed spaced apart from the outer periphery of the cylinder 100 is configured to surround the impact shielding member 630 in the cylinder 100, the penetration through the housing 400 The ball 410 is formed, the seating portion 620 protruding to the inside of the noise shielding member 630 is penetrated toward the through hole 410, but the flat plate 640 outside the noise shielding member 630 is housed. (400) After making contact with the surface, the surface between the flat plate 640 and the housing 400 is fixed using a fixing means such as a bolt.

As described above, the seating portion 620 protruding to the inside of the noise shielding member 630 passes through the through hole 410 of the housing 400 and is fixed to the outer surface of the housing 400 by a flat plate 640 at the same time. , The seating portion 620 has a structure that is inserted into the insertion groove portion 120 side formed of the outer surface of the cylinder 100.

With the above structure, the piston 200 provided inside the cylinder 100 strikes the upper end of the chisel 300 that strikes and crushes the crushed object by up and down motion, which is an area that generates noise when hitting the upper end portion (A) By being configured to be wrapped by the noise shielding member 630 of the hitting and noise shielding member 600, it is possible to prevent the noise generated during an impact between the piston 200 and the chisel 300 from propagating to the outside.

On the other hand, the noise shielding member 630 of the hitting noise shielding member 600 is to be seated on the seating portion 620 as described above, but has a structure stacked with a urethane layer 632 and an NBR layer 631. .

NBR is Acrylonitrile Butadiene Runner (acrylonitrile butadiene), which is commonly called nitrile rubber, and refers to a material having excellent oil and abrasion resistance and stable heat resistance.

On the other hand, the gas filling chamber 111 is usually configured in the back head 110, which is composed of the upper side of the hydraulic breaker 1, and the piston 200 hits the chisel 300 while the chisel 300 is avoided. The noise generated when hitting and hitting the crushed material is propagated to the outside of the cylinder 100 and at the same time, the noise propagates to the backhead 110 side.

In order to shield the noise propagating through the backhead 110 side, the present invention includes a backhead sound absorbing member 220 on the upper surface side of the piston 200 as shown in FIG. 3.

That is, in detail, as shown in FIG. 3, the annular groove 210 is formed toward the upper surface of the piston 200 and the annular back head sound absorbing member 220 is pressed into the groove 210.

The back head sound absorbing member 220 forms an annular groove 221 on the outer circumferential surface and the inner circumferential surface, respectively, so that it can exhibit elasticity and elasticity when being pressed into and fixed to the recess 210, and is not easily displaced by external force after pressing. By preventing the elasticity and elasticity, it is possible to exert a close contact force with the inner circumferential surface of the groove 210, so that noise can be easily blocked from propagating toward the gas filling chamber 111 side of the back head 110.

On the other hand, in the present invention, the configuration of the back head sound absorbing member 220 may be configured differently as shown in FIG. 4, in this embodiment, it is referred to as a piston sound absorbing member 240 and is denoted by different reference numerals.

That is, the piston sound absorbing member 240 forms a multi-stage indentation groove 230 in which the inner diameter becomes smaller as it enters the upper surface side of the piston 200, and the piston sound absorbing member inserted into the multi-stage indentation groove 230 ( 240, and the cover member 250 covering the upper surface of the piston 200 is fixed to fix the piston sound absorbing member 240.

As the sound absorbing member provided on the upper surface of the piston 200, the above-described embodiment is named and described as the back head sound absorbing member 220, but in this embodiment, it is called the piston sound absorbing member 240, and the name and the code are distinguished. Did.

However, both of the above-described back head sound absorbing member 220 and piston sound absorbing member 240 serve to counteract noise and vibration generated when the piston 200 strikes the chisel 300, and are similar. Do.

Meanwhile, the piston sound absorbing member 240 is fitted with a hollow ring member 241 fitted into a groove having a relatively small inner diameter corresponding to the lowermost end of the multi-stage recessed groove 230, and inside the ring member 241 It has an insertion protrusion 242 for being inserted into and has a rigid complementary member 243 seated on the stepped 231 of a groove having a relatively large inner diameter among the multi-stage recessed grooves 230, and the rigid complementary member 243 ) It includes a sealing member 244 is provided on the upper surface.

As shown in FIG. 4, the sealing member 244 constitutes first and second tapered portions 245 and 246, which are tapered and axially oriented from both sides, respectively, and the first and second tapered portions 245 and 246 And has a connecting portion 247 that crosses the inside of the sealing member 244.

Meanwhile, the taper angle of the first taper portion 245 is formed to be relatively smaller than the angle of the second taper portion 246, and the length of the tapered surface of the first taper portion 245 is the second taper portion ( 246) to be formed relatively longer than the length of the tapered surface.

The ring member 241 and the sealing member 244 is preferably made of NBR material.

On the other hand, in the present invention, the chisel 300 is configured to be separable, but a chisel sound absorbing member 330 is formed on a contact portion that is separated and combined, so that the piston 200 strikes the chisel 300 in contact with the crushed material. The noise generated in the process and the noise and vibration generated when the chisel 300 strikes the crushed object are reduced.

In particular, as the work time for the chisel 300 to crush crushed materials accumulates, the tip side of the end of the chisel 300 becomes dull, destroyed, or damaged.

In this case, the chisel 300 should be replaced with the new chisel 300 by separating it from the hydraulic breaker 1. In this case, since the entire chisel 300 is replaced and replaced, the hydraulic breaker 1 is entirely disassembled to replace and replace the chisel 300, thereby delaying the working time and replacing the entire chisel 300. As described above, there have been problems in that the maintenance cost for exchanging has increased.

In order to solve this problem, the present invention focuses on the idea of separating the chisel 300 and applies it to the hydraulic breaker 1.

To this end, the chisel 300 may be configured to be able to be separated and fastened to two places, respectively, as shown in FIGS. 5 to 7.

First, in the structure of the chisel 300, the part that comes into contact with the piston 200 and is hit will be referred to as the chisel top part 310 and the part that comes into contact with the crushed object will be referred to as the chisel bottom part 320.

As shown in FIGS. 5 to 7, the chisel 300 may be separable or fastened to the chisel top end 310 and the chisel bottom end 320, respectively.

The coupling protrusion 311 is formed toward the lower end of the chisel upper end 310, and the coupling groove 321 through which the coupling protrusion 311 can be coupled to the inside of the upper end of the chisel bottom 320 is configured.

In addition, the chisel sound absorbing member 330 is configured to be press-fit to the bottom surface of the coupling groove 321.

The chisel sound absorbing member 330 is preferably made of NBR material.

Meanwhile, the chisel 300 is configured to be separated into a chisel upper end 310 and a chisel lower end 320, respectively, but various embodiments as in FIGS. 5 to 7 are possible.

First, as shown in FIG. 5, the outer side of the engaging protrusion 311 and the inner circumferential surface of the engaging groove 321 are formed in a tapered form, so that the engaging protrusion 311 is connected to the engaging groove 321 of the lower end of the chisel 320. It is configured to be press-fitted in a tapered state.

At this time, in order to prevent the above-described chisel upper end 310 from falling out of the chisel lower end part 320, a coupling protrusion 311 through the coupling protrusion 311 of the chisel top 310 is horizontally drilled, , Coupling pin for punching the lower end of the chisel 320, which is the corresponding position, also drills the lower end of the chisel coupling hole 322, and the coupling protrusion connecting hole 312 and the lower end of the chisel coupling hole 322 It is fixedly coupled using (340).

Also, as shown in FIG. 6, the coupling protrusion 311 of the upper chisel portion 310 is formed in a cylindrical shape, and the coupling groove portion 321 of the lower chisel portion 320 corresponding thereto is also configured in a cylindrical shape to form the coupling protrusion ( 311) is configured to be fitted to the coupling groove 321 by a forced fitting method.

On the other hand, as shown in FIG. 7, the coupling protrusion 311 of the upper chisel portion 310 is formed in a cylindrical shape, but a male screw is formed on the outer circumferential surface of the coupling protrusion 311, and the coupling of the lower chisel portion 320 corresponding thereto A female thread may be formed on the inner circumferential surface of the groove portion 321 to screw the coupling protrusion 311 to the coupling groove portion 321 to be coupled and detachable.

In addition, it is common to use the hydraulic breaker 1 in connection with a clamp portion of a heavy equipment (not shown), and the connecting portion 700 of the hydraulic breaker 1 connected to the clamp of the heavy equipment is shown in FIG. 710).

However, in the related art, there is a problem in that a crushing operation is performed while being connected by a connection pin 710 between the clamp and the hydraulic breaker 1, or noise is significantly generated due to a collision between the connection pin 710 and the clamp when moving.

In order to overcome this point, the present invention provides a connecting pin 710 for connecting with a clamp (not shown) with a connecting hole 701 of the connecting part 700, as shown in FIG. 1, wherein the connecting pin 710 A rigid complementary material 711 is provided on the outer circumferential surfaces of both ends, and a bush 713 is formed outside the rigid complementary material 711, and at the same time, a circular ring 714 is formed outside the bush 713 to connect the hole 710. ) It is configured to be supported in direct contact with the inner circumferential surface, and each of the connecting pins 710 protruding outwardly of the connecting hole 710 is configured with a stopper 712 made of urethane.

In this way, by configuring the chisel 300 to separate or combine the chisel upper end 310 and the chisel lower end 320, respectively, using the chisel 300, the object to be crushed and crushed are performed for a period of time, if necessary. When the chisel 300 is to be replaced, the entire chisel 300 can be replaced separately without replacing or replacing the entire chisel 300, thereby significantly reducing maintenance costs of the hydraulic breaker 1.

In addition, as the chisel 300 prevents the noise generated when hitting and crushing the crushed material from being propagated by the chisel absorbing member 330 of the chisel 300, it has an effect of reducing the degree of noise generation. will be.

As described above, although the present invention has been described with limited embodiments and drawings, the present invention is not limited to the above embodiments, and the contents described above by those skilled in the art to which the present invention pertains Of course, various modifications and variations may be possible.

Therefore, the technical idea in the present invention should be grasped by the claims described below, but it will be apparent that all equivalent or equivalent modifications fall within the scope of the technical idea of the present invention.

One; Hydraulic breaker 100; cylinder
110; Backhead 111; Gas filling room
120; Insertion groove 200; piston
210; Groove 220; Back head sound absorbing member
221; Annular groove 230; Multi-stage recessed groove
231; Stepped 240; Piston sound absorbing member
241; Ring member 242; Insertion protrusion
243; Rigid complement member 244; Sealing member
245; A first taper portion 246; 2nd taper part
247; Connection 250; Cover member
300; Chisel 310; Chisel top
311; Coupling protrusion 312; Coupling protrusion
320; Chisel lower portion 321; Coupling groove
322; Chisel lower end coupling hole 330; Chisel absorption member
340; Binding pin 400; housing
500; Valve 600; No impact noise barrier
610; Base member 620; Seating
630; Noise shielding member 631; NBR floor
632; Urethane layer 640; Flat plate
700; Connection 701; Connector
710; Connecting pin 711; Rigid complementary material
712; Stopper 713; bush
714; Circular ring

Claims (16)

A piston that reciprocates by hydraulic pressure inside a cylinder provided with a back head at the top;
A chisel that is hit by the piston and descends in a predetermined stroke and crushes the object to be crushed;
A valve provided outside the housing surrounding the cylinder to switch and supply high and low pressure hydraulic pressure for reciprocating the piston up and down;
A hitting noise shielding member surrounding the outside of the region where the piston hits the chisel to shield noise generated when the piston hits the chisel;
A back head sound absorbing member provided on an upper surface side of the piston exposed to the back head:
Including,
A breaker having a low-noise structure comprising forming annular grooves on inner and outer surfaces of the back head sound absorbing member, respectively.
delete delete delete A piston in which an annular groove is formed on an upper surface side by reciprocating by hydraulic pressure inside a cylinder provided with a back head at the top;
A chisel that is hit by the piston and descends in a predetermined stroke and crushes the object to be crushed;
A valve provided outside the housing surrounding the cylinder to switch and supply high and low pressure hydraulic pressure for reciprocating the piston up and down;
A hitting noise shielding member surrounding the outside of the region where the piston hits the chisel to shield noise generated when the piston hits the chisel;
An annular back head sound absorbing member pressed into the groove of the piston;
Including,
A breaker having a low-noise structure comprising forming annular grooves on inner and outer surfaces of the back head sound absorbing member, respectively.
delete delete delete delete delete delete delete delete A piston having a multi-stage indentation groove configured to reciprocate by hydraulic pressure inside a cylinder provided with a back head on the upper side, and having an inner diameter smaller as it enters the upper side;
A piston sound absorbing member inserted into the multi-stage recessed groove;
A cover member that covers and secures the upper surface of the piston to fix the piston sound absorbing member;
A chisel that is hit by the piston and descends in a predetermined stroke and crushes the object to be crushed;
A valve provided outside the housing surrounding the cylinder to switch and supply high and low pressure hydraulic pressure for reciprocating the piston up and down;
A hitting noise shielding member surrounding the outside of the region where the piston hits the chisel to shield noise generated when the piston hits the chisel;
Including,
The piston sound absorbing member,
A ring member having a hollow shape in which an inner diameter corresponding to the lowermost end of the multi-stage recessed groove is inserted into a relatively small groove;
A rigid complementary member having an insertion protrusion for inserting into the ring member and seated on a stepped side of a groove having a relatively large inner diameter among the multi-stage recessed grooves;
A sealing member provided as an upper surface of the rigid complementary member;
Breaker having a low-noise structure comprising a.
The method of claim 14,
The first and second tapered portions are tapered in both directions from the both sides of the sealing member and axially formed, respectively,
A breaker having a low-noise structure comprising a first and second tapered portion and a connecting portion for transversely connecting the inside of the sealing member.
The method of claim 15,
The tapered angle of the first tapered portion is formed to be relatively smaller than the angle of the second tapered portion, and the length of the tapered surface of the first tapered portion is relatively longer than the length of the tapered surface of the second tapered portion. Breaker with structure.

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