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KR0174395B1 - Piston of a hydraulic pump motor having a pressure oil supply hole - Google Patents

Piston of a hydraulic pump motor having a pressure oil supply hole Download PDF

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Publication number
KR0174395B1
KR0174395B1 KR1019940006723A KR19940006723A KR0174395B1 KR 0174395 B1 KR0174395 B1 KR 0174395B1 KR 1019940006723 A KR1019940006723 A KR 1019940006723A KR 19940006723 A KR19940006723 A KR 19940006723A KR 0174395 B1 KR0174395 B1 KR 0174395B1
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KR
South Korea
Prior art keywords
piston
oil supply
hydraulic pump
pressure oil
bore
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Application number
KR1019940006723A
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Korean (ko)
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KR950027189A (en
Inventor
강호명
Original Assignee
토니헬샴
볼보건설기계코리아주식회사
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Publication date
Application filed by 토니헬샴, 볼보건설기계코리아주식회사 filed Critical 토니헬샴
Priority to KR1019940006723A priority Critical patent/KR0174395B1/en
Priority to JP6278316A priority patent/JPH07279845A/en
Priority to DE4439135A priority patent/DE4439135A1/en
Publication of KR950027189A publication Critical patent/KR950027189A/en
Application granted granted Critical
Publication of KR0174395B1 publication Critical patent/KR0174395B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0602—Component parts, details
    • F03C1/0605—Adaptations of pistons

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

본 발명은 유압 펌프/모터의 피스톤과 실린더 내벽의 섭동면 사이에 압유를 공급함으로써 기기의 최적 성능 유지와 내구성 향상을 얻도록 한 압유공급홀이 형성된 유압 펌프/모터의 피스톤에 관한 것으로, 구동축에 의해 회전되며 소정의 경사각을 갖는 사판의 저면부와 피스톤의 단부에 설치된 슈가 섭동함에 따라 상기 피스톤이 실린더블록의 보어 내부에서 복동되는 유압펌프/모터의 피스톤에 있어서, 상기 피스톤의 길이방향으로 소정위치에 상기 피스톤의 내주면과 외주면사이를 관통하는 적어도 하나 이상의 압유공급홀이 형성됨에 따라, 상기 보어내부에 흡입된 압유가 상기 압유공급홀을 통해 상기 피스톤의 외주면과 상기 보어의 내벽사이로 분출된다.The present invention relates to a piston of a hydraulic pump / motor in which a hydraulic oil supply hole is formed to supply optimum pressure between the piston of the hydraulic pump / motor and the perturbation surface of the cylinder inner wall to maintain optimum performance and improve durability of the device. In a piston of a hydraulic pump / motor in which the piston is double-acting inside the bore of the cylinder block as the shoe is perturbed by the bottom of the swash plate having a predetermined inclination angle and the shoe installed at the end of the piston, the predetermined position in the longitudinal direction of the piston. As at least one pressure oil supply hole penetrating between the inner circumferential surface and the outer circumferential surface of the piston is formed, the pressure oil sucked into the bore is ejected between the outer circumferential surface of the piston and the inner wall of the bore through the pressure oil supply hole.

Description

압유공급홀이 형성된 유압 펌프/모터의 피스톤Pistons of hydraulic pumps / motors with hydraulic oil supply holes

제1도는 일반적인 피스톤 펌프의 구조를 개략펌프로 도시하는 종단면도.1 is a longitudinal sectional view showing the structure of a general piston pump as a schematic pump.

제2도는 종래의 유압 펌프 중 실린더블록과 피스톤 부분을 도시하는 부분절개단면도.2 is a partial cutaway sectional view showing a cylinder block and a piston portion of a conventional hydraulic pump.

제3도는 본 발명의 일실시예에 의한 피스톤을 도시하는 부분절개단면도.3 is a partial cutaway sectional view showing a piston according to an embodiment of the present invention.

제4도는 제3도의 A-A'선을 따라 절취한 횡단면도.4 is a cross-sectional view taken along the line AA ′ of FIG. 3.

제5도는 본 발명의 일실시예에 의한 피스톤과 실린더블록 부분을 도시하는 부분절개단면도.Figure 5 is a partial cutaway cross-sectional view showing a piston and a cylinder block portion according to an embodiment of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 피스톤 4 : 압유공급홀1: Piston 4: Pressure oil supply hole

5 : 밸런스그루브 6 : 실린더보어5: balance groove 6: cylinder bore

본 발명은 유압 펌프/모터의 피스톤에 관한 것으로, 더욱 상세하게는 피스론과 실린더 내벽의 섭동면 사이에 압유률 공급함으로써 기기의 최적 성능 유지와 내구성 향상을 얻도록 한 압유공급흘이 형성된 유압 펌프/모터의 피스톤에 관한 것이다.The present invention relates to a piston of a hydraulic pump / motor, and more particularly, to a hydraulic pump provided with a hydraulic oil supply flow between the piston and the perturbation surface of the cylinder inner wall so as to obtain optimum performance and durability of the device. It is about the piston of the motor.

펌프 피스톤펌프는, 제1도에 도시된 바와 같이, 구동축(101)과 함께 회전하는 사판(102: swash plate)의 저면부와 피스톤(103)의 단부에 장착된 슈(104: shoe)가 섭동하면서 그 결과 사판(102)이 회전함에 따라 피스톤(103)이 왕복운동을 하여 흡입 및 토출행정을 교호적으로 수행하였다.As shown in FIG. 1, the pump piston pump is perturbed by a shoe 104 mounted at the bottom of the swash plate 102 and the end of the piston 103, which rotates together with the drive shaft 101. FIG. As a result, as the swash plate 102 rotates, the piston 103 reciprocates to alternately perform suction and discharge strokes.

그런데, 위와 같은 피스톤펌프는, 전술한 피스톤(103)이 실린더블록(105)의 보어(106)를 왕복섭동할 때 과다한 마찰이 발생하고, 또 전술한 사판(102)을 따라 슈(104)가 회전섭동을 할 때, 피스톤(103)의 복동방향과 사판(102)에 의한 힘의 작용방향이 일치하지 않기 때문에, 피스톤(1)이 실린더블록(105)의 보어(106)를 복동할 때 각 섭동단부에는 구조상 엇힘이 발생하게 되는 문제점이 있었다.However, in the piston pump as described above, excessive friction occurs when the piston 103 reciprocates the bore 106 of the cylinder block 105, and the shoe 104 along the swash plate 102 described above. When the rotational perturbation does not coincide with the direction of actuation of the force by the swash plate 102 and the double acting direction of the piston 103, when the piston 1 doubles the bore 106 of the cylinder block 105 At the perturbation end, there was a problem that structural discrepancies occurred.

즉, 제2도에 도시한 바와 같이, 피스톤(103)의 복동시, 각 섭동단부인 A부분 및 B부분에 엇힘이 발생하게 되고, 이 엇힘이 과대할 때 실린더블록(105)의 보어(106)내주면에 긁힘(scratch)등에 의한 손상과 이상 마모등이 야기 되었다. 그리고, 이러한 손상과 마모는 유압기기에 있어서의 치명적인 문제점인 과다한 오일누출을 초래하였고, 기기의 성능을 급격히 저하시킴은 물론, 각 부품의 내구성과 수명을 현저히 단축시키는 심각한 단점으로 지적되었다.That is, as shown in FIG. 2, when double acting on the piston 103, a gap occurs in the A and B portions, which are perturbation ends, and when the gap is excessive, the bore 106 of the cylinder block 105 is excessive. The inner circumferential surface was damaged by scratches and abnormal wear. In addition, such damage and wear resulted in excessive oil leakage, which is a fatal problem in hydraulic equipment, and it was pointed out as a serious disadvantage that drastically lowered the performance of the equipment and significantly shortened the durability and life of each component.

이러한 단점을 보완하기 위하여, 피스톤(103)의 외주면에 소정간격으로 여러개의 밸런스그루브(ballance groove)를 형성하는 것이 일반적이었지만, 그 효과는 극히 미미하였고, 펌프 근본적인 해결책이 절실히 요구되는 실정이었다.In order to compensate for these disadvantages, it was common to form a plurality of balance grooves at predetermined intervals on the outer circumferential surface of the piston 103, but the effect was extremely small, and the pump fundamental solution was urgently needed.

본 발명자는 이에 대한 해결책을 찾기위하여 예의 연구를 거듭한 결과 본 발명을 완성하기에 이르렀다.The present inventors have intensively studied to find a solution to this and have now completed the present invention.

본 발명의 목적은, 유압 펌프/모터등에 있어서 피스톤 왕복섭동시의 실린더 내벽과의 기계적 마찰을 저감시키고, 엇힘으로 인한 실린더 내주면의 손상을 효과적으로 방지할 수 있는 압유공급 홀이 형성된 유압 펌프/모터의 피스톤을 제공하는 데에 있다.An object of the present invention is to provide a hydraulic pump / motor in which a hydraulic oil supply hole is formed to reduce mechanical friction with the inner wall of a cylinder during reciprocation of a piston in a hydraulic pump / motor, and to effectively prevent damage to the inner circumferential surface of the cylinder due to staggering. To provide a piston.

전술한 목적을 달성하기 위한 본 발명의 한 태양에 의하면, 구동축에 의해 회전되며 소정의 경사각을 갖는 사판의 저면부와 피스톤의 단부에 설치된 슈가 섭동함에 따라 상기 피스톤이 실린더블록의 보어내부에서 복동되는 유압펌프/모터의 피스톤에 있어서, 상기 피스톤의 길이방향으로 소정위치에 상기 피스톤의 내주면과 외주면사이를 관통하는 적어도 하나 이상의 압유공급흘이 형성됨에 따라, 상기 보어내부에 흡입된 압유가 상기 펌프공급흘을 통해 상기 피스톤의 외주면과 상기 보어의 내벽사이로 분출되는 것을 특징으로 하는 압유공급홀이 형성된 유압 펌프/모터의 피스톤이 제공된다.According to one aspect of the present invention for achieving the above object, the piston is double-actuated in the bore of the cylinder block as the perturbation of the shoe is installed on the bottom of the swash plate and the end of the piston having a predetermined inclination angle and rotated by a drive shaft In a piston of a hydraulic pump / motor, at least one pressure oil supply passage penetrating between an inner circumferential surface and an outer circumferential surface of the piston is formed at a predetermined position in the longitudinal direction of the piston, so that the pressure oil sucked into the bore is supplied to the pump. A piston of a hydraulic pump / motor with a hydraulic oil supply hole is provided which is ejected between the outer circumferential surface of the piston and the inner wall of the bore through the flow.

이하, 첨부도면에 의거 본 발명의 바람직한 실시예를 설명한다.Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

본 실시예에 있어서 유압 펌프/모터의 전체적 구성과 작동은 이미 제1도에 의해 간략히 설명된 바 있으므로 중복을 피하고, 유압 펌프/모터의 구성부품 중 본 실시예와 직접적인 관련이 있는 피스톤과 실린더보어만을 중점적으로 설명한다.The overall configuration and operation of the hydraulic pump / motor in this embodiment has already been briefly described by FIG. 1, avoiding duplication, and the piston and cylinder bore of the components of the hydraulic pump / motor are directly related to this embodiment. Focus only on.

첨부도면 제3도는, 본 실시예에 의한 피스톤(1)을 나타내는 부분 절개단면도이고, 제4도는 제3도의 A-A'선을 따라 절취한 횡단면도이다.3 is a partial cutaway cross-sectional view showing the piston 1 according to the present embodiment, and FIG. 4 is a cross-sectional view taken along the line AA ′ of FIG. 3.

도시된 바와 같이, 피스톤(1)의 길이방향으로 소정위치에 피스톤(1)의 내주면(2)으로부터 외주면(3)까지를 관통하는 복수개의 압유공급홀(4)이 형성된다. 이 압유공급흘(4)은 제4도에 도시된 바와 같이, 피스톤(1)의 횡단면상에서 소정각도 간격으로 복수개 형성될 수 있다.As shown, a plurality of pressure oil supply holes 4 penetrating from the inner circumferential surface 2 to the outer circumferential surface 3 of the piston 1 are formed at a predetermined position in the longitudinal direction of the piston 1. As shown in FIG. 4, the pressure oil supply flow 4 may be formed in plural at predetermined angular intervals on the cross section of the piston 1.

그리고, 바람직하기로는 제3도에서와 같이, 피스톤(1)의 길이방향으로 복수개의 밸런스그루브(5)가 형성되어 있는 경우, 전술한 압유공급흘(4)을 이 밸런스그루브(5)중 적어도 어느 하나의 위치에 형성한다.Preferably, as shown in FIG. 3, when the plurality of balance grooves 5 are formed in the longitudinal direction of the piston 1, the above-described pressure oil supply flow 4 is applied to at least one of the balance grooves 5. Form at any one position.

위과 같이 구성된 본 실시예의 피스톤은, 제5도에 도시된 바와 같이, 실린더보어(6)하부의 오일흡입구(7)로부터 압유가 공급되면, 이 압유 중 일부가 전술한 압유공급흘(4)을 통해 실린더보어(6)펌프향해 강하게 분출되므로, 이와 같은 분출유압에 의해 피스톤(1) 외주면과 실린더보어(6)내벽 간에 항상 일정 틈새가 유지되어진다. 결국, 사판과의 회전섭동에 의한 구조적 엇힘이 발생하더라도, 피스톤(1)과 실린더보어(6)의 섭동단부에서의 기계적 접촉을 방지할 수 있고, 비록 접촉을 일으킨다 하더라도, 그 마찰력을 현저히 줄일 수 있으므로, 종래 문제시 되었던 실린더내벽의 손상으로 인한 오일누출등의 제반 문제점들은 최대한 억제된다. 또한, 피스톤(1)외주면과 실린더보어(6)내벽의 섭동면 사이에 지속적으로 유막을 형성하게 되므로, 강력한 윤활효과가 제공된다.As shown in FIG. 5, when the piston oil is supplied from the oil suction port 7 under the cylinder bore 6, the piston of the present embodiment configured as described above has a portion of the hydraulic oil supply flow 4 described above. Since the jet is strongly ejected toward the pump through the cylinder bore 6, a constant clearance is always maintained between the outer peripheral surface of the piston 1 and the inner wall of the cylinder bore 6 by this ejection hydraulic pressure. As a result, even if structural displacement occurs due to rotational swash with the swash plate, mechanical contact at the perturbation end of the piston 1 and the cylinder bore 6 can be prevented, and even if a contact occurs, the frictional force can be significantly reduced. Therefore, all problems such as oil leakage due to damage to the inner wall of the cylinder, which have been a conventional problem, are suppressed as much as possible. In addition, since the oil film is continuously formed between the outer peripheral surface of the piston 1 and the perturbation surface of the inner wall of the cylinder bore 6, a strong lubrication effect is provided.

이상 설명한 바와 같이 본 발명은, 유압 펌프/모터등에 있어서 피스톤 왕복섭동시의 실린더 내벽과의 기계적 마찰을 저감시키고, 엇힘으로 인한 실린더 내주면의 손상과 이상 마모등을 효과적으로 방지할 수 있으므로, 기기의 성능을 장기간 동안 최적상태로 유지할 수 있으며, 내구성이 및 수명이 현저히 향상될 수 있다.As described above, the present invention can reduce the mechanical friction with the cylinder inner wall during piston reciprocation in the hydraulic pump / motor and the like, and effectively prevent damage to the inner circumferential surface of the cylinder due to staggering and abnormal wear. Can be maintained at an optimum state for a long time, and durability and lifespan can be significantly improved.

Claims (2)

구동축에 의해 회전되며 소정의 경사각을 갖는 사판의 저면부와 피스톤의 단부에 설치된 슈가 섭동함에 따라 상기 피스톤이 실린더블록의 보어 내부에서 복동되는 유압펌프/모터의 피스톤에 있어서, 상기 피스톤의 길이방향으로 소정위치에 상기 피스톤의 내주면과 외주면사이를 관통하는 적어도 하나 이상의 압유공급흘이 형성됨에 따라, 상기 보어내부에 흡입된 압유가 상기 압유공급홀을 통해 상기 피스톤의 외주면과 상기 보어의 내벽사이로 분출되는 것을 특징으로 하는 압유공급흘이 형성된 유압 펌프/모터의 피스톤.In a piston of a hydraulic pump / motor in which a piston is doubled inside a bore of a cylinder block as a shoe perturbed at the bottom of a swash plate having a predetermined inclination angle and an end of a piston is rotated by a drive shaft, in the longitudinal direction of the piston. As at least one pressure oil supply passage penetrates between the inner circumferential surface and the outer circumferential surface of the piston at a predetermined position, the pressure oil sucked into the bore is ejected between the outer circumferential surface of the piston and the inner wall of the bore through the pressure oil supply hole. Piston of the hydraulic pump / motor, characterized in that the hydraulic oil supply flow is formed. 제1항에 있어서, 상기 피스톤의 길이방향으로 복수개의 밸런스그루브가 형성되고, 상기 압유공급홀은 상기 밸런스그루부의 위치에 형성되는 것을 특징으로 하는 압유공급흘이 형성된 유압 펌프/모터의 피스톤.2. The piston of a hydraulic pump / motor having a hydraulic oil supply passage as claimed in claim 1, wherein a plurality of balance grooves are formed in the longitudinal direction of the piston, and the pressure oil supply hole is formed at a position of the balance groove portion.
KR1019940006723A 1994-03-31 1994-03-31 Piston of a hydraulic pump motor having a pressure oil supply hole KR0174395B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019940006723A KR0174395B1 (en) 1994-03-31 1994-03-31 Piston of a hydraulic pump motor having a pressure oil supply hole
JP6278316A JPH07279845A (en) 1994-03-31 1994-10-18 Piston for hydraulic pump/motor in which pressure-oil supplyhole is formed
DE4439135A DE4439135A1 (en) 1994-03-31 1994-11-02 Piston for hydraulic pump or motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940006723A KR0174395B1 (en) 1994-03-31 1994-03-31 Piston of a hydraulic pump motor having a pressure oil supply hole

Publications (2)

Publication Number Publication Date
KR950027189A KR950027189A (en) 1995-10-16
KR0174395B1 true KR0174395B1 (en) 1999-04-15

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KR1019940006723A KR0174395B1 (en) 1994-03-31 1994-03-31 Piston of a hydraulic pump motor having a pressure oil supply hole

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JP (1) JPH07279845A (en)
KR (1) KR0174395B1 (en)
DE (1) DE4439135A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239943C1 (en) * 2002-08-30 2003-10-30 Kaercher Gmbh & Co Kg Alfred Pump for high-pressure cleaning device has reciprocating piston provided with peripheral channel between high-pressure seal and oil seal
JP2009074456A (en) * 2007-09-21 2009-04-09 Denso Corp Pump
DE102014211870A1 (en) * 2014-06-20 2015-12-24 Robert Bosch Gmbh Swash plate machine

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DE4439135A1 (en) 1995-10-05
JPH07279845A (en) 1995-10-27
KR950027189A (en) 1995-10-16

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