KR101670370B1 - Suplly structure for lube-oil of hydraulic brake - Google Patents

Suplly structure for lube-oil of hydraulic brake Download PDF

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Publication number
KR101670370B1
KR101670370B1 KR1020150186207A KR20150186207A KR101670370B1 KR 101670370 B1 KR101670370 B1 KR 101670370B1 KR 1020150186207 A KR1020150186207 A KR 1020150186207A KR 20150186207 A KR20150186207 A KR 20150186207A KR 101670370 B1 KR101670370 B1 KR 101670370B1
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KR
South Korea
Prior art keywords
chisel
lubricating oil
front cover
grease
thruster
Prior art date
Application number
KR1020150186207A
Other languages
Korean (ko)
Inventor
한순형
Original Assignee
대모 엔지니어링 주식회사
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Priority to KR1020150186207A priority Critical patent/KR101670370B1/en
Application granted granted Critical
Publication of KR101670370B1 publication Critical patent/KR101670370B1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
    • E02F5/305—Arrangements for breaking-up hard ground
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/126—Lubrication systems

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The present invention relates to a lubricating oil supply structure of a hydraulic brake with an improved structure, disposed inside a front head of a hydraulic brake to form a plurality of holes drilled in a front cover and a thrust ring which are come in contact with a chisel when the chisel is vertically moved in order to the inside and the outside of the front cover to be opened, wherein a bearing member where lubricating oil is impregnated in each hole to continuously supply the lubricating oil to the chisel without injecting lubricating grease.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lubricating oil supply structure for a hydraulic breaker,

The present invention relates to a lubricating oil supply structure for a hydraulic breaker, and more particularly, to a lubricating oil supply structure for a hydraulic breaker which includes a thruster provided in a front head of a hydraulic breaker, To a lubricating oil supply structure of a hydraulic breaker in which a bearing member impregnated with lubricating oil is assembled in each hole so that lubricating oil can be continuously supplied to the teeth side without injecting lubricating grease.

In general, hydraulic breakers are installed on the arm of an excavator instead of a bucket, and are used for crushing rocks and piling in civil engineering works and building foundation works.

The pneumatic breaker, which operates by the forces of hydraulic and compressive gas, is a device that performs several hundred hits per minute and repeatedly transmits the hitting force to the structure each time it hits.

The operation of the breaker mounted on the excavator is such that when the worker first operates the boom bar of the excavator and presses the foot switch in contact with the crush object with the chisel of the breaker to turn on the hydraulic pressure supply device, As a result, the impact piston reciprocates and strikes the chisel, thereby crushing the object to be crushed.

In the hydraulic breaker, a front head is disposed at a lower portion of a cylinder forming a main body of the breaker, and a head cap is disposed at an upper portion of the cylinder, and is integrally fastened through a long bolt and a nut.

The pistons are installed in the cylinder, and part of both ends of the piston are provided to be reciprocable on the front head and the head cap provided at both ends of the cylinder, respectively.

The cylinder and front head are connected by a connecting pin.

The front head is provided with a chisel for crushing and crushing rock or concrete structures. The chisel is reciprocally moved in conjunction with the upward and downward reciprocating motion of the piston to perform a function of crushing the rock and concrete.

Further, the cylinder is fastened to a long bolt fixed to the front head through the cylinder from the head cap so as to not only fasten the front head and the head cap but also assemble each component into one unit.

Most hydraulic breakers currently have a lubricant (grease) filler nipple at each point that requires lubrication and the user will fill the lubricant periodically or as needed. This wastes time for the breaker user and, if not filled in time, damages the breaker and shortens the life of the breaker.

Some hydraulic breakers are equipped with an automatic lubrication pump, which allows the grease to be automatically dispensed to the required location. The conventional automatic lubrication (grease) pump draws a portion of the hydraulic oil that activates the breaker, The structure is complicated and large in size by discharging the grease, and the grease storage container is disposable, which is costly.

Prior art related to a conventional lubrication apparatus for a hydraulic breaker for improving this is disclosed in Korean Patent Publication No. 10-0460984 entitled " Automatic supply of lubrication oil for a hydraulic breaker "(registered on Dec. 1, 2004) An input means for automatically supplying a lubricating oil according to the number of times of operation of the breaker, a input means for transmitting a number of strokes and a force to the compressor by linear reciprocating motion each time the breaker is hit, A pumping means which is compressed by the amplified force of the compression means and which discharges grease every predetermined number of strokes, and a means for supplying grease to the pumping means and storing the grease And a grease filling cylinder for supplying lubricating oil to the hydraulic brake device, The force means includes an input piston which linearly moves in direct correspondence with the pressure change of the gas (air or nitrogen gas) in the upper space of the piston in the breaker and transmits a force to the compression means, A check ball and a check spring which are opened when the breaker piston is opened to adjust the flow direction of the air so as to adjust the flow direction of the air and an input socket serving as a guiding role of the input piston and a connecting port for connecting the breaker and the hose, A clutch bar for rotating the compression shaft by turning the left and right rotary motion of the sliding bar in one direction and rotating the compression shaft, and a pivoting mechanism for rotating the compression shaft in one direction so that the pumping force of the pumping piston A compression shaft for transmitting, a spring for returning the sliding bar Wherein the pumping means is compressed by the rotational force of the compression shaft and a pumping piston which periodically receives the rotational force of the compression shaft and pumps the lubricating oil (grease) A compression spring for pushing the pumping piston with a repulsive force, a check ball and a check spring serving as a check valve by forming only one directional flow of the grease, a discharge nipple connecting the discharged grease to the required portion with a hose, A nut for fixing the pumping housing; a compression adjusting bolt for adjusting a pumping amount by adjusting a compression force of the compression spring; and a fixing nut for fixing the compression adjusting bolt , The filling means is a grease filling cylinder, which is connected to a grease pump (body) A check ball and a check spring assembled in the filling cylinder base to prevent the grease from flowing when the grease is filled, a suction boat for sucking and discharging grease, An air exhaust spring for exhausting air between the grease filled with the grease after the grease is sucked and the suction paddle, an exhaust spring for supporting the grease when the grease is discharged by the pumping means, A filler handle serving as a handle, a filler cover for guiding the filler handle, a cover for the filler body, a filler body made of a transparent transparent material for storing the grease and easy to recognize the amount of grease, And a filling connector for supporting filling.

Another prior art related to the conventional lubrication apparatus of a hydraulic breaker is disclosed in Korean Patent Registration No. 10-1290789 entitled " Piston contact surface forced lubrication apparatus of hydraulic breaker "(registered on Apr. 23, 2013) A front cover for supporting the rod, a rod pin disposed inside the front head to prevent the rod from falling downward, and a ring bushing for maintaining a vertical alignment with the piston upon hitting the rod, And a hydraulic control valve for controlling the upper and lower strokes of the piston is provided to the inside of the cylinder positioned above the front head and nitrogen gas is supplied to one side of the cylinder, An in-and-out pod provided with a filled accumulator and high-pressure oil is installed, An oil pressure control valve, an accumulator, and an inlet / outlet pod. The upper portion of the cylinder portion has a back head filled with nitrogen gas, and a hydraulic brake provided with a valve for filling nitrogen gas into one side of the back head. Wherein an upper seal and a lower seal are respectively provided on a contact surface of a lower piston of the cylinder portion and a lower seal and are communicated with the in / out pod so as to be forcedly lubricated to the upper side of a lower end of a large- Wherein the high pressure oil in the forced lubrication port causes permanent lubrication between the piston contact surfaces on the lower side of the cylinder and the piston to be supported in the transverse direction and on the contact surface of the lower piston A low-pressure return port is provided between the upper seal and the lower seal to form a low- It is made of a configuration.

However, in the conventional hydraulic breaker, the front cover is disposed inside the front end so as to prevent friction against the contact area with the chisel in the front head, and the thruster is disposed inside the upper side of the front cover. However, The structure for supplying lubricating grease to the inside of the cover and the thruster is complicated. In addition, when the supply path of the lubricating grease is clogged by the foreign substance, the lubricating function is lost and the parts may be damaged.

Korean Patent Registration No. 10-0460984 entitled "Automatic Lubricant Supply Device for Hydraulic Breaker" (Registered on December 1, 2004) Korean Registered Patent Publication No. 10-1290789 entitled "Forced Lubricating Device of Piston Contact Surface of Hydraulic Breaker" (Registered on July 23, 2013)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and its object is to provide a hydraulic shock absorber which is disposed in a front head of a hydraulic breaker so that the thruster and the prototype cover, A lubricating oil supply structure of a hydraulic breaker having a structure in which a plurality of holes to be drilled are formed and a bearing member impregnated with lubricating oil is assembled in each hole so that lubricating oil can be continuously supplied to the teeth side without injecting lubricating grease .

According to an aspect of the present invention, there is provided a hydraulic breaker including a front cover disposed inside a front head end of a hydraulic breaker and contacting an outer surface of a chisel whose inner side is operated up and down, And a first bearing member which is press-fitted into each of the engaging holes, one surface of which is in contact with an outer surface of the chisel, and the lubricating oil is impregnated in the first bearing member.

The first bearing member is made of a porous material and is sintered with graphite powder so that the lubricating oil is impregnated inside.

Another characteristic element of the present invention is characterized in that it has a thruster disposed inside the front head of the hydraulic breaker and in contact with an upper outer surface of a chisel whose inner surface is operated up and down, And a second bearing member which is press-fitted into each of the assembled holes, one surface of which is in contact with the outer surface of the chisel, and the lubricant is impregnated in the second bearing member.

The second bearing member is made of a porous material and is sintered with graphite powder so that the lubricating oil is impregnated inside.

Another characteristic element of the present invention is a hydraulic brake device comprising a front cover disposed inside a front head end of a hydraulic breaker and contacting an outer surface of a chisel whose inner side is operated up and down, And an outer circumferential surface of the front cover, wherein the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential portion of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential A plurality of assembling holes formed perforated so as to be opened inside and outside along the periphery of the chisel; a first and a second porous member, which is press-fitted into the engaging holes and the assembling hole so that each inner side thereof is in contact with the outer surface of the chisel, And two bearing members.

Since the front cover and the thruster are combined with the first and second bearing members which are internally impregnated with the lubricating oil, the supply of the lubricating oil to the teeth side can be gradually and prolonged for a long time, There is no need to minimize the injection or the injection of the grease, the injection path necessary for the injection of the grease can be omitted, and the structure of the front head can be simply constructed.

1 is a sectional view showing a configuration of a first embodiment of a lubricating oil supply structure of a hydraulic breaker according to the present invention;
2 is an exploded perspective view showing the front cover of the first embodiment of the present invention.
3 is an enlarged cross-sectional view of the first bearing member of the present invention.
4 is a sectional view showing the configuration of a second embodiment of a lubricating oil supply structure of a hydraulic breaker according to the present invention.
5 is an exploded perspective view showing the thruster of the second embodiment of the present invention.
6 is a sectional view showing the configuration of a third embodiment of the lubricating oil supply structure of the hydraulic breaker according to the present invention.
7 is a configuration diagram showing a front cover and a thruster of a third embodiment of the present invention;

1 and 2, a first embodiment of a lubricating oil supply structure for a hydraulic breaker according to the present invention is characterized in that, as shown in Figs. 1 and 2, a chisel 20 disposed inside a front end of a front head 20 of a hydraulic breaker, A plurality of engagement holes 110 formed in the front cover 100 to be in contact with the outer surface of the front cover 100 so as to be opened inward and outward along the outer periphery of the front cover 100, And a first bearing member 310, which is press-fitted into the coupling hole 110 of one side of the chisel 50 and one side of which is in contact with the outer surface of the chisel 50 and in which lubricating oil is impregnated.

The hydraulic breaker includes a front head 20 disposed at a lower portion of a cylinder 10 forming a main body of the breaker and a head cap 30 disposed at an upper portion of the cylinder 10 to be integrally fastened do.

The front cover 100 is a cylindrical structure having a hollow 105 for inserting the chisel 50. The front cover 100 is disposed inside the front end (lower end) of the front head 20 to support the chisel 50, And blocking the penetration into the front head (20).

The first bearing member 310 may be formed by sintering the first bearing member 310 and the second bearing member 310, respectively, by press-fitting the first bearing member 310 into the engagement holes 110 formed in the periphery of the front cover 100.

That is, the first bearing member 310 is formed into a cylindrical structure corresponding to the coupling hole 110 by sintering the graphite powder, for example.

As shown in FIG. 3, the first bearing member 310 has a plurality of ventilation holes 315 formed by sintering the graphite powder, and by impregnating the ventilation holes 315 with lubricating oil, The lubricating oil in the vent hole 315 flows out to the outside of the chisel 50 during the upward and downward movement of the chisel 50 so that the lubrication function can be performed by continuously supplying the lubricating oil to the chisel 50 side.

A thruster 200 for supporting the chisel 50 is disposed above the front cover 100 and a second injection hole 220 is formed in the thruster 200 for perforating the lubrication grease have.

The first bearing member 310 is forcedly press-fitted into each of the plurality of holes 110 formed perforated along the outer periphery of the front cover 100, So as to have the same surface as the inner circumferential surface of the hollow 105.

To this end, the first bearing member 310 and the inner surface of the hollow 105 of the front cover 100 are formed to correspond to the inner surface of the first bearing member 310.

 The front cover 100 to which the first bearing members 310 are coupled is introduced into the lower portion of the front head 20 to be press-fitted.

Thereafter, the operation of the hydraulic breaker is performed by inserting the chisel 50 into the hollow 105 of the front cover 100, and the piston blows the upper part of the chisel 50 according to the hydraulic pressure supplied into the cylinder 10 Thereby crushing the crushed material.

One side of the first bearing member 310 which is in contact with the outer surface of the chisel 50 during the upward and downward reciprocating motion of the chisel 50 is in surface contact with the surface of the vent hole 315 of the first bearing member 310 And the lubricating oil supplied to the outer surface of the chisel 50 is supplied.

The lubricating oil contained in the vent hole 315 gradually flows out of the chisel 50 as the upper and lower reciprocating motions of the chisel 50 are repeated. It is possible to provide the lubrication function to the chisel 50 without any limitation.

4 and 5 show a second embodiment of a lubricating oil supply structure for a hydraulic breaker according to the present invention, which has the basic components of a hydraulic breaker and is arranged inside the front head 20 of the hydraulic breaker, And a thruster 200 that is in contact with an upper outer surface of the chisel 50 that is operated up and down. The thruster 200 has a plurality of assembled holes (not shown) And a second bearing member 320 which is press-fitted into each of the assembled holes 210, one surface of which is in contact with the outer surface of the chisel 50, and the lubricating oil is impregnated inside.

The thruster 200 is a cylindrical structure which is press-fitted into the front head 20 and has a through hole 205 opened upward and downward so as to insert the chisel 50. The thruster 200 has a cylindrical shape, So as to support the chisel 50.

The second bearing member 320 may be formed by sintering a porous material and being forcedly press-fitted into the assembled holes 210 perforated around the outer circumferential surface of the thruster 200.

In other words, the second bearing member 320 is formed into a cylindrical structure corresponding to the tapered hole 210 by sintering the graphite powder, for example.

The second bearing member 320 has a plurality of ventilation holes 315 formed by sintering the graphite powder and infiltrates the inside of the vent hole 315 with the lubricating oil. The lubricating oil in the vent hole 315 flows out to the outside of the chisel 50 so that the lubrication oil can be continuously supplied to the side of the chisel 50 to perform the lubrication function.

A front cover 100 for supporting the chisel 50 is disposed below the thruster 200 and a first injection hole 120 is formed in the front cover 100 to puncture the lubrication grease have.

The second embodiment of the present invention is characterized in that the second bearing member 320 is forcedly inserted into each of the plurality of holes 210 formed perforated along the outer circumference of the thruster 200, And the one side surface is coincidentally joined so as to have the same surface as the inner circumferential surface of the through hole 205.

For this purpose, the second bearing member 320 and the inner circumferential surface of the through hole 205 of the thruster 200 correspond to the first bearing member 320 and the second bearing member 320, respectively.

 Then, the thruster 200, to which the second bearing members 320 are coupled, is introduced into the lower portion of the front head 20 to be press-fitted.

Thereafter, the operation of the hydraulic breaker is performed by inserting the chisel 50 into the through hole 205 of the thruster 200, and the piston blows the upper portion of the chisel 50 according to the hydraulic pressure supplied into the cylinder 10 And one side of the second bearing member 320 which is in contact with the outer surface of the chisel 50 during the upward and downward reciprocating motion of the chisel 50 for crushing the object to be crushed is in surface contact with the surface of the second bearing member 320, The lubricating oil contained in the vent hole 315 flows inward to supply the lubricating oil to the outer surface of the chisel 50.

The lubricating oil contained in the vent hole 315 gradually flows out of the chisel 50 as the upper and lower reciprocating motions of the chisel 50 are repeated. It is possible to provide the lubrication function to the chisel 50 without any limitation.

6 and 7 are views showing a third embodiment of the present invention. Fig. 6 and Fig. 7 show a third embodiment of the present invention. Fig. 6 is a front view of a hydraulic breaker, A cover 100 and a thruster 200 disposed inside the front head 20 so as to be spaced apart from the upper side of the front cover 100 and in contact with the upper outer surface of the chisel 50, The front cover 100 includes a front cover 100 and a front cover 100. The front cover 100 includes a coupling hole 110 formed to be open at the inner and outer peripheries of the front cover 100, And a porous material which is press-fitted into the coupling hole 110 and the assembly hole 210 so that the lubricating oil is impregnated in the interior of the assembly hole 210 so that the inner surface of each of the assembly holes 210 is in contact with the outer surface of the chisel 50 And first and second bearing members 310 and 320.

In the third embodiment of the present invention, the first and second bearing members 310 and 320 are press-fitted into the front cover 100 and the thruster 200 of the first and second embodiments described above, Can be omitted.

The first and second bearing members 310 and 320 are inserted into the coupling hole 110 formed in the front cover 100 and the thruster 200 and the first and second bearing members 310 and 320, The lubricating oil contained in the vent hole 315 of the chisel 50 gradually flows out to the outside of the chisel 50 as the upper and lower reciprocating motions of the chisel 50 are repeated. .

When lubricating oil is not supplied from the first and second bearing members 310 and 320 after a lapse of a long time, the lubricating oil is continuously supplied to the front head 20 by replacing the first and second bearing members 310 and 320 impregnated with the lubricating oil It is possible to provide a lubrication function.

The present invention is characterized in that the front cover 100 and the first and second bearing members 310 and 320 with lubricant oil impregnated into the front cover 100 and the thruster 200 are inserted into the front head 20, It is not necessary to minimize the injection of the grease into the front head 20 or to inject the grease into the front head 20 so that the injection path necessary for the grease injection can be omitted and the structure of the front head 20 Can be simply configured.

10: cylinder 20: front head
30: head cap 50: chisel
100: front cover 105: hollow
110: engaging hole 120: first injection hole
200: thruster 205: through hole
210: an assembler 220: a second injection ball
310, 320: first and second bearing members

Claims (5)

A cylindrical front cover 100 disposed inside the front end of the front head 20 of the hydraulic breaker and contacting the outer surface of the chisel 50 whose inner side is operated up and down;
A cylindrical thruster 200 disposed inside the front head 20 so as to be spaced apart from the upper side of the front cover 100 and in contact with an upper outer surface of the chisel 50 whose inner side is operated up and down;
A plurality of engagement holes 110 formed in the front cover 100 so as to be opened and closed along the outer periphery of the front cover 100;
A plurality of assembling holes (210) formed perforated so as to open inside and outside along the outer periphery of the thruster (200); And
The inner surface is brought into contact with the outer surface of the chisel 50 and the outer surface thereof is brought into contact with the inner surface of the front head 20 and the lubricant is internally impregnated And a plurality of cylindrical first and second bearing members (310, 320). The method according to claim 1,
Wherein the first and second bearing members (310, 320) are made of a porous material and sintered with graphite powder so that the lubricating oil is impregnated inside. delete delete delete
KR1020150186207A 2015-12-24 2015-12-24 Suplly structure for lube-oil of hydraulic brake KR101670370B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150186207A KR101670370B1 (en) 2015-12-24 2015-12-24 Suplly structure for lube-oil of hydraulic brake

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Application Number Priority Date Filing Date Title
KR1020150186207A KR101670370B1 (en) 2015-12-24 2015-12-24 Suplly structure for lube-oil of hydraulic brake

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230001311U (en) * 2021-12-20 2023-06-27 주식회사 한국가스기술공사 Boring bar apparatus with built in bearing element

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000120698A (en) * 1998-10-19 2000-04-25 Nsk Ltd Revolving ring bearing
JP2001107108A (en) 1999-08-05 2001-04-17 Asmo Co Ltd Sintered bearing, and manufacturing method of the same
JP2002531274A (en) * 1998-12-09 2002-09-24 ホフマン・ウント・コムパニー・エレクトロコーレ・アクチェンゲゼルシャフト Porous work piece impregnation method
KR200444960Y1 (en) * 2007-11-14 2009-06-18 주식회사 에버다임 Bush for hydraulic breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000120698A (en) * 1998-10-19 2000-04-25 Nsk Ltd Revolving ring bearing
JP2002531274A (en) * 1998-12-09 2002-09-24 ホフマン・ウント・コムパニー・エレクトロコーレ・アクチェンゲゼルシャフト Porous work piece impregnation method
JP2001107108A (en) 1999-08-05 2001-04-17 Asmo Co Ltd Sintered bearing, and manufacturing method of the same
KR200444960Y1 (en) * 2007-11-14 2009-06-18 주식회사 에버다임 Bush for hydraulic breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230001311U (en) * 2021-12-20 2023-06-27 주식회사 한국가스기술공사 Boring bar apparatus with built in bearing element
KR200497537Y1 (en) * 2021-12-20 2023-12-08 주식회사 한국가스기술공사 Boring bar apparatus with built in bearing element

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