KR200144360Y1 - Hydraulic cylinder - Google Patents
Hydraulic cylinder Download PDFInfo
- Publication number
- KR200144360Y1 KR200144360Y1 KR2019970003525U KR19970003525U KR200144360Y1 KR 200144360 Y1 KR200144360 Y1 KR 200144360Y1 KR 2019970003525 U KR2019970003525 U KR 2019970003525U KR 19970003525 U KR19970003525 U KR 19970003525U KR 200144360 Y1 KR200144360 Y1 KR 200144360Y1
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- South Korea
- Prior art keywords
- piston
- piston rod
- groove
- hydraulic cylinder
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 11
- 230000002093 peripheral effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/226—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having elastic elements, e.g. springs, rubber pads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/755—Control of acceleration or deceleration of the output member
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
피스톤로드와 쿠션링의 강도를 보강할 수 있도록 피스톤의 형상변경과 그에 따른 피스톤로드의 결합구조가 개선된 유압실린더에 대해 개시한다. 이 유압실린더는 양단부에 각각 압유가 출입되는 제 1, 2압력포트(112, 122)가 설치되는 원통형의 실린더(100)와, 실린더(100) 내부에 수용되어 압유에 의해 슬라이딩 가능하게 결합되며 양측에 내경이 서로 다른 대/소경홈(210, 220)이 형성되고 그 사이로 연통되는 관통공(230)이 형성되는 피스톤(200)과, 피스톤(200)의 대경홈(210)에 일단부가 나사결합되며 그 타단부의 길이방향으로 나사홈(302)이 형성되는 피스톤로드(300)와, 피스톤(200)의 관통공(230)을 통해 나사홈(302)에 체결되는 체결부(410)를 가지며 그 체결부(410)의 일단으로 연장형성되는 머리부(420)가 피스톤(200)의 소경홈(220)에 대응되게 형성되는 체결부재(400)를 구비한다.Disclosed is a hydraulic cylinder in which a shape change of a piston and a coupling structure of a piston rod are improved in order to reinforce the strength of the piston rod and the cushioning. These hydraulic cylinders are cylindrical cylinders 100 having first and second pressure ports 112 and 122 through which pressure oil enters and exits at both ends thereof, and are accommodated in the cylinder 100 and slidably coupled by pressure oil. Large diameter / small diameter grooves 210 and 220 having different inner diameters are formed in the piston 200 and through holes 230 communicating therebetween, and one end is screwed into the large diameter groove 210 of the piston 200. And a piston rod 300 having a thread groove 302 formed in the longitudinal direction of the other end thereof, and a fastening portion 410 fastened to the screw groove 302 through the through hole 230 of the piston 200. The head 420 extending to one end of the fastening part 410 has a fastening member 400 formed to correspond to the small diameter groove 220 of the piston 200.
Description
본 고안은 유압실린더에 관한 것으로써, 더 상세하게는 피스톤로드와 쿠션링의 강도를 보강함과 아울러, 분해 및 조립이 용이하도록 한 유압실린더에 관한 것이다.The present invention relates to a hydraulic cylinder, and more particularly to a hydraulic cylinder to reinforce the strength of the piston rod and cushioning, and to facilitate the disassembly and assembly.
종래의 유압실린더는 제1도에 도시된 바와 같이, 양단에 압유가 출입되는 제 1, 2압력포트(12a, 14a)를 각각 가지는 헤드카바(12)와 로드카바(14)가 마련되는 실린더(10)와, 상기 실린더(10)의 내부에 슬라이딩 가능하게 결합되고 내주면에 암나사가 형성된 중공(22)을 가지는 피스톤(20)과, 그 중공(22) 내부로 관통 설치되고 피스톤(20)의 외측에서 결합부재(40)로 고정되는 피스톤로드(30)와, 그 피스톤로드(30)의 외부면에 끼움 결합되는 쿠션링(50)을 구비한다.As shown in FIG. 1, a conventional hydraulic cylinder includes a cylinder having a head cover 12 and a rod cover 14 having first and second pressure ports 12a and 14a through which pressure oil enters and exits, respectively. 10) and a piston (20) having a hollow (22) slidably coupled to the inside of the cylinder (10) and formed with female threads on an inner circumferential surface thereof, and installed through the inside of the hollow (22) and outside of the piston (20). Piston rod 30 is fixed to the coupling member 40, and the cushioning ring 50 is fitted to the outer surface of the piston rod (30).
또한 상기 결합부재(40)는 상기 피스톤(20)의 중공(22)을 관통하여 소정부위가 외측으로 돌출된 피스톤로드(30)의 일단부 외주면을 체결시키는 피스톤너트(42)와, 상기 피스톤너트(42)를 피스톤로드(30)에 고정시키는 스크류(44)(또는 스톱링)등을 구비하여서, 피스톤로드(30)를 피스톤(20)과 일체화함과 아울러 피스톤로드(30)와 피스톤너트(42)의 풀림을 방지한다.In addition, the coupling member 40 is a piston nut 42 for fastening the outer peripheral surface of one end of the piston rod 30 through which the predetermined portion protrudes outward through the hollow 22 of the piston 20, and the piston nut. A screw 44 (or a stop ring) for fixing the 42 to the piston rod 30 is provided so that the piston rod 30 is integrated with the piston 20 and the piston rod 30 and the piston nut ( 42) prevent loosening.
상기 피스톤로드(30)는 그 외주면 내경이 서로 다른 대경부(32)와 제 1, 2소경부(34, 36)를 가지며, 상기 제 1, 2소경부(34, 36)의 사이에는 나사가공의 가공특성상 로드릴리프부(38)가 형성된다.The piston rod 30 has a large diameter portion 32 and first and second small diameter portions 34 and 36 having different inner diameters of the outer circumferential surface thereof, and is threaded between the first and second small diameter portions 34 and 36. Due to the processing characteristics of the rod relief portion 38 is formed.
이러한 구조를 갖는 종래 유압실린더는 제 1, 2압력포트(12a, 14a)를 통해 교대로 압유를 실린더(10) 내부의 양측 압력실(피스톤(30)을 중심으로 로드측 압력실(B)과 헤드카바측 압력실(A)로 구분됨)로 공급시키고, 이에따라 전달되는 유압력으로 피스톤(20)과 피스톤로드(30)를 실린더(10) 내부에서 좌, 우 또는 상, 하로 이동시켜줌으로써, 그 피스톤로드(30)의 끝단에 연설된 소정의 유압기계부품(미도시됨)을 왕복 이동시킨다.The conventional hydraulic cylinder having such a structure alternately pressurizes the hydraulic oil through the first and second pressure ports 12a and 14a to both side pressure chambers inside the cylinder 10 (the rod side pressure chamber B around the piston 30). The piston 20 and the piston rod 30 by moving the piston 20 and the piston rod 30 in the cylinder 10 to the left, right or up and down with the hydraulic force transmitted accordingly. A predetermined hydraulic machine part (not shown) reciprocated at the end of the piston rod 30 is reciprocated.
이때 상기 압유의 유압력이 헤드카바측 압력실(A)로 전달된 때는 피스톤(20)에 연동되는 피스톤로드(30)가 로드카바(14)의 내부로 슬라이딩됨과 동시에 로드측 배압이 제 2압력포트(14a)를 통해 실린더(10) 외부로 배출된다.At this time, when the hydraulic force of the pressure oil is transmitted to the head cover side pressure chamber (A), the piston rod 30 interlocked with the piston 20 slides into the load cover 14 and at the same time the rod side back pressure is the second pressure. It is discharged out of the cylinder 10 through the port 14a.
이와 반대로, 압유의 유압력이 로드측 압력실(B)로 전달될 때는 피스톤(20)이 헤드카바(12)측으로 슬라이딩됨과 동시에, 이 피스톤(20)의 슬라이딩 동작에 따라 헤드카바측 배압이 헤드카바(12)의 제 1압력포트(12a)를 통해 실린더(10)의 외부로 배출된다.On the contrary, when the hydraulic force of the pressurized oil is transmitted to the rod side pressure chamber B, the piston 20 slides toward the head cover 12 side and the head cover side back pressure becomes the head according to the sliding operation of the piston 20. It is discharged to the outside of the cylinder 10 through the first pressure port 12a of the cover 12.
한편 종래의 유압실린더는 압유가 헤드카바측 압력실(A)로 유입되면 피스톤(20)이 로드카바(14)측으로 이동되어 쿠션행정초기까지 도달하게 된다. 그후 상기한 쿠션행정이 점진적으로 진행됨에 따라 쿠션링(50)의 일단면이 피스톤로드(30)의 단부에 접촉됨과 동시에, 쿠션링(50)의 외경이 로드카바(14)의 내경에 슬라이딩되어 유로가 차단되면서 로드압력실(B)에 고압력이 발생하게 된다. 이 압력은 압유가 로드카바(14)측 오리피스를 통해 실린더의 외부로 배출되면서 점차적으로 해소되고, 이 작동에 따라 유압실린더의 쿠션기능이 이루어진다.Meanwhile, in the conventional hydraulic cylinder, when the pressure oil flows into the head cover side pressure chamber A, the piston 20 moves to the load cover 14 side to reach a cushion stroke initial stage. Then, as the cushion stroke proceeds gradually, one end surface of the cushion ring 50 contacts the end of the piston rod 30, and the outer diameter of the cushion ring 50 is slid to the inner diameter of the rod cover 14. As the flow path is blocked, high pressure is generated in the rod pressure chamber (B). This pressure is gradually released as the pressurized oil is discharged to the outside of the cylinder through the rod cover 14 side orifice, and according to this operation, the hydraulic cylinder is cushioned.
그런데, 종래의 유압실린더는 유압력이 헤드카바측 압력실(A)에 전달되어 피스톤로드(30)를 이동시키면, 그 이동에 따라 유로가 차단되면서 로드측 압력실(B)에 높은 쿠션압력이 발생함에 따라, 쿠션링(50) 내/외주면의 유압력의 차이에 따른 쿠션링(50)의 팽창현상(쿠션링(50)의 표면이 외측으로 부풀어 팽창되는 현상)이 발생되고, 이 쿠션링(50)이 팽창됨에 따라 쿠션작동시 로드카바(14)의 내주면과 마찰되어 소음 및 쿠션링(50)이 조기 마모되는 문제점이 있었다.However, in the conventional hydraulic cylinder, when the hydraulic force is transmitted to the head cover side pressure chamber (A) and moves the piston rod 30, a high cushion pressure is applied to the rod side pressure chamber (B) while the flow path is blocked according to the movement. As it occurs, the expansion phenomenon of the cushion ring 50 according to the difference in the hydraulic force of the inner / outer peripheral surface of the cushion ring 50 (the phenomenon that the surface of the cushion ring 50 is inflated outward) is generated, the cushion ring As the 50 is inflated, there is a problem in that the noise and the cushioning ring 50 are prematurely worn due to friction with the inner circumferential surface of the load cover 14 when the cushion is operated.
한편 상기한 쿠션링(50) 팽창현상의 방지책으로는 쿠션링(50)의 두께를 크게 하여 팽창으로 인한 문제점을 해소할 수 있다. 그러나, 상기 쿠션링(50)의 두께변화에 따라 피스톤로드(30)의 외경을 감소시켜야 하는 데 이런 부수적인 구조변경으로 인해 피스톤로드(30)의 로드릴리프부(38)의 강도가 약해지므로 장시간의 피로응력이 누적되면 파손될 우려가 있었다.On the other hand, as a preventive measure of the expansion of the cushioning 50, the thickness of the cushioning 50 may be increased to solve the problem caused by the expansion. However, the outer diameter of the piston rod 30 should be reduced in accordance with the thickness change of the cushion ring 50. However, due to this additional structural change, the strength of the rod relief portion 38 of the piston rod 30 is weakened. If fatigue stress accumulates, it could be broken.
그리고, 피스톤로드(30)는 그 외경의 두께가 감소됨에 따라 상대적으로 피스톤(20)과의 접촉면적이 감소되므로, 고압이 전달될 경우 압축강도가 저하되어 피스톤(20)과 접촉된 단부에 피스톤(20)을 슬라이딩시키는 배압력이 작용하여 그 단부가 파손될 우려가 있었다.In addition, the piston rod 30 has a relatively reduced contact area with the piston 20 as the thickness of its outer diameter decreases, so that when the high pressure is transmitted, the compressive strength is lowered and the piston is in contact with the piston 20. The back pressure which slides 20 acts, and there exists a possibility that the edge part may be damaged.
또한, 종래 유압실린더의 다른 문제점으로는 피스톤로드(30)의 단부와 피스톤너트(42)를 결합시킨 다음에 그 외주면에서 피스톤로드(30)의 외주면으로 나사체결시키는 조립공정의 번거로움과, 그 복잡한 조립구조로 인해 분해작업이 어려운 문제점이 있었다.In addition, another problem of the conventional hydraulic cylinder is the troublesomeness of the assembling process of coupling the end of the piston rod 30 and the piston nut 42 and then screwing it from the outer peripheral surface to the outer peripheral surface of the piston rod 30, and Due to the complicated assembly structure, the disassembly work was difficult.
한편, 종래의 다른 유압실린더를 나타낸 제2도를 참조하면, 이는 피스톤로드(30)의 일단부에 나사홈(32)이 형성되고, 그 나사홈(32)에 대응하여 피스톤(20)의 일측에서 피스톤로드(30)를 볼트(40)로 체결시켜 조립되는 구조를 가짐으로써, 피스톤(20)의 형상을 단순구조로의 이점을 만족시키면서 피스톤로드(30)의 외경 두께를 적정압력에도 견딜 수 있는 적정한 두께로 유지하는 이점을 가지지만, 이는 소형 저압용 유압실린더에서 사용 가능하고 고압이 사용되는 곳에서는 피스톤로드(30)의 외경과 볼트(40) 나사부에 유압작동으로 인한 인장력이 크게 발생하므로 볼트(40)의 나사부에 크랙이 발생하는 등의 파손의 우려가 있었다.Meanwhile, referring to FIG. 2, which shows another conventional hydraulic cylinder, a thread groove 32 is formed at one end of the piston rod 30, and one side of the piston 20 corresponds to the thread groove 32. By having the structure that is assembled by fastening the piston rod 30 with the bolt 40 in the above, the outer diameter thickness of the piston rod 30 can withstand the appropriate pressure while satisfying the advantages of the shape of the piston 20 in a simple structure It has the advantage of maintaining the proper thickness, but it can be used in a small low-pressure hydraulic cylinder, and where high pressure is used, since the external force of the piston rod 30 and the tension force due to the hydraulic operation in the threaded portion of the bolt 40 are largely generated. There was a fear of damage such as cracking in the threaded portion of the bolt 40.
본 고안은 상기한 제반문제점을 해결하기 위하여 안출된 것으로서, 다음과 같은 목적은 갖는다.The present invention has been made to solve the above problems, has the following objectives.
첫째, 피스톤로드의 외경과 쿠션링의 강도를 보강할 수 있도록 한 유압실린더를 제공한다.First, it provides a hydraulic cylinder to reinforce the outer diameter of the piston rod and the strength of the cushioning.
둘째, 피스톤과 피스톤로드를 일체화시키는 결합부재를 간소화하여 분해 및 조립이 용이하도록 한 유압실린더를 제공한다.Second, it provides a hydraulic cylinder for simplifying the disassembly and assembly by simplifying the coupling member to integrate the piston and the piston rod.
셋째, 피스톤과 체결부재의 피치 및 나사형식을 상반되게 하여 피스톤의 풀림현상을 방지하도록 한 유압실린더를 제공한다.Third, it provides a hydraulic cylinder to prevent the piston loosening phenomenon by making the pitch and the screw type of the piston and the fastening member in opposition.
제1도는 종래 유압실린더를 나타낸 단면도.1 is a cross-sectional view showing a conventional hydraulic cylinder.
제2도는 종래 다른 유압실린더를 나타낸 요부 단면도.Figure 2 is a sectional view of the main part showing another conventional hydraulic cylinder.
제3도는 본 고안에 따른 유압실린더를 나타낸 분해 사시도.Figure 3 is an exploded perspective view showing a hydraulic cylinder according to the present invention.
제4도는 본 고안의 결합상태 단면도이다.4 is a cross-sectional view of the coupling state of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
100 : 실린더 110 : 헤드카바100: cylinder 110: head cover
112 : 제 1압력포트 120 : 로드카바112: first pressure port 120: rod cover
122 : 제 2압력포트 200 : 피스톤122: second pressure port 200: piston
210 : 대경홈 220 : 소경홈210: large diameter groove 220: small diameter groove
230 : 관통공 300 : 피스톤로드230: through hole 300: piston rod
302 : 나사홈 400 : 체결부재302: screw groove 400: fastening member
410 : 체결부 420 : 머리부410: fastening portion 420: head
500 : 쿠션링 600 : 개스킷500: cushioning 600: gasket
상기한 목적을 달성하기 위한 본 고안 유압실린더는, 양단부에 각각 압유가 출입되는 제 1, 2압력포트가 마련되는 실린더와; 상기 실린더의 내부에 슬라이딩 가능하게 결합되고 출입되는 압유에 의해 왕복 이동되며, 그 일측에 암나사가 형성된 대경홈이 형성되고 그 타측에 상기 대경홈보다 직경이 작은 소경홈이 형성되며 상기 대경홈과 소경홈을 연결하는 관통공이 형성된 피스톤과; 상기 대경홈에 그 일단부가 나사결합되며, 그 단부에 길이방향으로 나사홈이 형성되는 피스톤로드와; 상기 관통공을 통해 상기 나사홈과 체결되는 체결부와, 그 체결부의 단부에 연장 형성되고 상기 소경홈에 대응되게 결합되는 머리부를 가지는 체결부재; 를 포함하여 이루어진다.The present invention hydraulic cylinder for achieving the above object, and the cylinder is provided with first and second pressure ports for entering and exiting the oil pressure at both ends; It is slidably coupled to the inside of the cylinder and reciprocated by the oil coming in and out, a large diameter groove having a female thread is formed on one side thereof, and a small diameter groove having a diameter smaller than the large diameter groove is formed on the other side thereof. A piston having a through hole connecting the groove; A piston rod having one end screwed into the large diameter groove and a screw groove formed in a longitudinal direction at an end thereof; A fastening member having a fastening portion coupled to the screw groove through the through hole, and a head portion extending from an end portion of the fastening portion and coupled to the small diameter groove; It is made, including.
상기 체결부재와 피스톤로드의 나사체결방향은 상기 피스톤과 피스톤로드의 체결방향과 상호 반대방향으로 체결함으로써, 피스톤과 피스톤로드의 풀림현상을 예방한다.The screwing direction of the fastening member and the piston rod is fastened in a direction opposite to the fastening direction of the piston and the piston rod, thereby preventing loosening of the piston and the piston rod.
본 고안에 의하면, 피스톤로드의 외경을 크게 함과 동시에 쿠션링의 두께를 크게 하며 피스톤의 풀림 방지구조를 간소화함으로써, 피로응력으로 인한 파손을 예방하고 분해 및 조립시간을 단축할 수 있는 효과를 갖는다.According to the present invention, by increasing the outer diameter of the piston rod and increasing the thickness of the cushioning and simplifying the piston anti-loosening structure, it has the effect of preventing breakage due to fatigue stress and shortening disassembly and assembly time. .
이하, 첨부된 도면을 참조하면서 본 고안의 바람직한 실시예를 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
제3도 및 제4도를 참조하면, 본 고안에 따른 유압실린더는, 양단부에 압유가 출입되는 제 1, 2압력포트(112, 122)를 각각 가지는 헤드카바(110)와 로드카바(120)가 마련되는 실린더(100)와, 상기 실린더(100)의 내부에 슬라이딩 가능하게 결합되고 출입되는 압유에 의해 왕복 이동되는 피스톤(200)과, 상기 피스톤(200)의 일측에 그 일단부가 나사결합되며 그 단부에 길이방향으로 나사홈(302)이 형성되는 피스톤로드(300)를 피스톤(200)에 고정시키는 체결부재(400)를 구비한다.Referring to FIGS. 3 and 4, the hydraulic cylinder according to the present invention includes a head cover 110 and a load cover 120 having first and second pressure ports 112 and 122, respectively, through which pressure oil flows in and out at both ends. Is provided with a cylinder 100, the piston 200 is slidably coupled to the inside of the cylinder 100 and the reciprocating movement by the pressure oil coming in and out, one end thereof is screwed to one side of the piston 200 It is provided with a fastening member 400 for fixing the piston rod 300, the screw groove 302 is formed in the longitudinal direction at the end thereof to the piston 200.
상기 피스톤(200)은 그 일측면에 암나사가 형성된 대경홈(210)이 형성되고, 그 타측면에 상기 대경홈(210)보다 직경이 작은 소경홈(220)이 형성되며, 그 사이에 상기 대경홈(210)과 소경홈(220)이 연통되도록 관통공(230)이 형성된다.The piston 200 has a large diameter groove 210 having a female thread formed on one side thereof, and a small diameter groove 220 having a smaller diameter than the large diameter groove 210 is formed on the other side thereof, and the large diameter therebetween. The through hole 230 is formed to communicate the groove 210 and the small diameter groove 220.
상기 체결부재(400)는 상기 관통공(230)을 통해 상기 나사홈(302)과 체결되는 체결부(410)와, 그 체결부(410)의 단부에 연장 형성되고 상기 소경홈(220)에 대응되게 결합되는 머리부(420)를 가진다.The fastening member 400 is a fastening portion 410 is fastened to the screw groove 302 through the through hole 230, and is formed to extend in the end of the fastening portion 410 and to the small diameter groove 220 It has a head 420 correspondingly coupled.
상기 체결부재(400)의 머리부(420) 내측면과 소경홈(220)의 사이에는 개스킷(600)을 개재하여 그 내부로 압유가 흐르는 것을 방지한다.Between the inner surface of the head portion 420 of the fastening member 400 and the small-diameter groove 220 through the gasket 600 to prevent the pressure oil flowing therein.
그리고, 상기 체결부재(400)는 그 머리부(420)의 평면이 상기 피스톤(200)의 단부 평면과 동일 평면상에 위치하거나 그 단부 평면의 내부로 함입되도록 피스톤(200)의 관통공(230)에 관통 설치하고, 그 타측의 외주면에는 소정부위가 상기 나사홈(302)에 체결되도록 체결부(410)가 형성되는 핀 볼트를 사용함이 바람직하다.In addition, the fastening member 400 has a through hole 230 of the piston 200 such that the plane of the head portion 420 is located on the same plane as the end plane of the piston 200 or embedded in the end plane. It is preferable to use a pin bolt installed in the through, and the fastening portion 410 is formed on the outer peripheral surface of the other side so that a predetermined portion is fastened to the screw groove 302.
상기 피스톤로드(300)는 상기 피스톤(200)의 대경홈(210)에 대응되는 외경을 가지는 소경부(310)와, 그 소경부(310)에 연장 형성되며 쿠션링(500)이 끼움 결합되는 대경부(320)와, 상기 소경부(310)의 나사가공시 형성되는 로드릴리프부(330)를 가진다.The piston rod 300 is a small diameter portion 310 having an outer diameter corresponding to the large diameter groove 210 of the piston 200, and is formed extending in the small diameter portion 310, the cushioning ring 500 is fitted It has a large diameter portion 320, and a rod relief portion 330 is formed when the small diameter portion 310 is screwed.
또한, 상기 피스톤로드(300)는 그 외경이 상기 피스톤(200)의 대경홈(210) 내경에 대응되는 크기로 형성되어 나사결합되고, 그 외주면에는 소정의 두께(내, 외주면의 쿠션유압력 차이가 발생하더라도 팽창되니 않을 정도의 두께)를 갖는 쿠션링(500)이 끼움 결합된다. 이 경우, 상기 피스톤로드(300)의 로드릴리프부(330)와 쿠션링(500)의 외경 및 두께가 소정 크기이상으로 확보 가능하므로, 강도가 보강되는 효과를 갖는다.In addition, the piston rod 300 is screwed by the outer diameter is formed in the size corresponding to the inner diameter of the large diameter groove 210 of the piston 200, the outer peripheral surface of a predetermined thickness (inner, outer peripheral surface cushion oil pressure difference Even if it occurs, the cushioning ring 500 having a thickness such that it is not expanded is fitted. In this case, since the outer diameter and thickness of the rod relief portion 330 and the cushioning ring 500 of the piston rod 300 can be secured to a predetermined size or more, the strength is reinforced.
이러한 구조를 가지는 본 고안의 조립공정은, 먼저 작업자는 피스톤로드(300)를 피스톤(200)의 대경홈(210)에 체결시키고, 체결부재(400)를 그 피스톤(200)의 타측에서 피스톤로드(300)의 나사홈(302)측으로 삽입한 다음에 임팩트 렌치 등의 공구(미도시됨)로 조여 결합시킨다.In the assembly process of the present invention having such a structure, the operator first fastens the piston rod 300 to the large diameter groove 210 of the piston 200, and the fastening member 400 is connected to the piston rod at the other side of the piston 200. Insert into the screw groove 302 side of the 300 and then tighten by tightening with a tool (not shown) such as an impact wrench.
이때, 상기 체결부재(400)는 피스톤(200)과 피스톤로드(300)의 나사결합되는 체결방향과 다른 반대방향으로 피스톤로드(300)에 결합된다. 즉, 상기 피스톤(200)이 피스톤로드(300)와 왼나사 형태로 결합되면, 체결부재(400)는 오른나사 형태로 피스톤로드(300)에 체결(피스톤(200)과 피스톤로드(300)의 나사체결방향이 오른나사 형태일 경우에는 그 반대임)시킴으로써, 피스톤(200)의 풀림현상을 예방할 수 있다.In this case, the fastening member 400 is coupled to the piston rod 300 in a direction opposite to the fastening direction in which the piston 200 and the piston rod 300 are coupled. That is, when the piston 200 is coupled to the piston rod 300 in the form of the left screw, the fastening member 400 is fastened to the piston rod 300 in the form of the right screw (piston 200 and the screw of the piston rod 300 When the fastening direction is the right-hand screw type, the opposite is), the loosening phenomenon of the piston 200 can be prevented.
또한 피스톤(200)과 체결부재(400)가 같은 오른 나사 형태일 경우, 나사의 피치 및 타입을 다르게 하여 피스톤(200)의 풀림현상을 예방할 수 있다.In addition, when the piston 200 and the fastening member 400 are in the same right screw shape, the loosening of the piston 200 may be prevented by changing the pitch and type of the screw.
한편, 상기 피스톤로드(300)의 대경부(320) 외주면에는 피스톤로드(300)와 피스톤(200)이 결합하지 전에 로드카바(120)의 내경에 대응되는 두께의 쿠션링(500)이 끼움 결합된다.On the other hand, before the piston rod 300 and the piston 200 are coupled to the outer circumferential surface of the large diameter portion 320 of the piston rod 300, the cushioning ring 500 having a thickness corresponding to the inner diameter of the rod cover 120 is fitted. do.
따라서 상기 쿠션링(500)은 일정 크기이상의 두께를 가지므로, 로드카바(120)측으로 쿠션작용이 발생할 경우, 그 내/외주면의 압력차이로 인해 생기는 팽창현상을 예방할 수 있다.Therefore, since the cushioning ring 500 has a thickness of more than a predetermined size, when the cushioning action occurs on the side of the load cover 120, it is possible to prevent the expansion phenomenon caused by the pressure difference between the inner / outer peripheral surface.
본 고안은 로드릴리프부(330)의 외경과 쿠션링(500)의 두께를 증대시킬 수 있도록 피스톤(200)의 형상을 개선하고 그에 따른 피스톤로드(300)와의 결합구조를 개량한 유압실린더를 제공함으로써, 다음과 같은 효과를 갖는다.The present invention improves the shape of the piston 200 to increase the outer diameter of the rod relief portion 330 and the thickness of the cushioning 500 and provides a hydraulic cylinder with improved coupling structure with the piston rod 300 accordingly. Thus, the following effects are obtained.
첫째, 피스톤로드(300)의 외경을 소정크기로 증대시킬 수 있으므로, 로드릴리프부(330)의 인장 및 압축강도를 보강하는 효과를 갖는다.First, since the outer diameter of the piston rod 300 can be increased to a predetermined size, it has the effect of reinforcing the tensile and compressive strength of the rod relief portion 330.
둘째, 쿠션링(500)의 두께를 소정크기로 증대시킬 수 있으므로, 고유압의 쿠션작용시 발생되는 쿠션링(500)의 팽창현상을 예방하는 효과를 갖는다.Second, since the thickness of the cushioning ring 500 may be increased to a predetermined size, the cushioning ring 500 may have an effect of preventing expansion of the cushioning ring 500 generated during the cushioning of the high pressure.
셋째, 피스톤(200)과 피스톤로드(300)를 일체화시키는 체결부재(400)를 간소화하여 유압실린더의 분해 및 조립이 용이해지는 효과를 갖는다.Third, by simplifying the fastening member 400 for integrating the piston 200 and the piston rod 300 has the effect of easy disassembly and assembly of the hydraulic cylinder.
넷째, 유압실린더에 사용되는 조립부품의 간소화에 따른 비용절감의 이점과 피스톤의 풀림을 방지하도록 하는 효과를 갖는다.Fourth, there is an advantage of reducing the cost and the piston to loosen by the simplification of the assembly used in the hydraulic cylinder.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019970003525U KR200144360Y1 (en) | 1997-02-28 | 1997-02-28 | Hydraulic cylinder |
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| KR2019970003525U KR200144360Y1 (en) | 1997-02-28 | 1997-02-28 | Hydraulic cylinder |
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| KR970018607U KR970018607U (en) | 1997-05-26 |
| KR200144360Y1 true KR200144360Y1 (en) | 1999-06-15 |
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| KR19980030921A (en) * | 1996-10-30 | 1998-07-25 | 이해규 | Cylinder Piston Fasteners |
| JP5091879B2 (en) * | 2009-01-13 | 2012-12-05 | カヤバ工業株式会社 | Fluid pressure cylinder |
| CN114263649A (en) * | 2021-12-27 | 2022-04-01 | 无锡申佳液压科技有限公司 | Hydraulic oil cylinder with protective structure and use method |
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