KR101757971B1 - Piston shoe of hydraulic pump - Google Patents
Piston shoe of hydraulic pump Download PDFInfo
- Publication number
- KR101757971B1 KR101757971B1 KR1020150059951A KR20150059951A KR101757971B1 KR 101757971 B1 KR101757971 B1 KR 101757971B1 KR 1020150059951 A KR1020150059951 A KR 1020150059951A KR 20150059951 A KR20150059951 A KR 20150059951A KR 101757971 B1 KR101757971 B1 KR 101757971B1
- Authority
- KR
- South Korea
- Prior art keywords
- groove
- swash plate
- piston
- ring
- hydraulic oil
- Prior art date
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Images
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
- 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
- F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
- F04B27/0878—Pistons
- F04B27/0886—Piston shoes
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- 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
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- 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
- F04B25/00—Multi-stage pumps
- F04B25/04—Multi-stage pumps having cylinders coaxial with, or parallel or inclined to, main shaft axis
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Reciprocating Pumps (AREA)
Abstract
The piston shoe in which the step and working flow path for improving the friction and lubrication performance according to the present invention is formed is a piston shoe which is engaged with the piston ball 11 of the piston 10 which is a component of the hydraulic pump and which is in contact with the swash plate 20 As a result,
A main body 100 having a piston ball housing 110 formed therein and coinciding with an outer circumferential surface of the piston ball 11, to which the piston ball 11 is inserted;
And a sliding part (200) formed on an upper end of the main body part (100) and in contact with the swash plate (20)
The sliding part (200)
An operating oil hole 210 penetrating from the center of the upper surface of the sliding portion 200 to the piston ball housing 110 of the main body 100 to allow hydraulic oil to flow therethrough so as to form a constricted central portion;
A hydraulic oil inflow groove 220 which is etched along the rim of the hydraulic oil hole 210 and is primarily transferred from the hydraulic oil hole 210 to the upper surface of the sliding portion 200;
The upper surface of the sliding portion 200 is etched in a ring shape spaced apart from the operating oil inflow groove 220 and connected to the working oil inflow groove 220 to receive the operating oil primarily transferred to the working oil inflow groove 220 An inner groove 230 to which the inner circumferential surface is secondarily transferred;
The upper surface of the sliding part 200 is spaced apart from the inner groove 230 and is etched in a ring shape along the upper edge of the upper surface of the sliding part 200 so that at least one incision part is formed on the side surface of the sliding part 200. [ An outer groove (240) for transferring the hydraulic fluid introduced into the sliding portion (200) and communicating with the outside;
An outer ring 250 positioned between the outer groove 240 and the inner groove 230 and contacting the swash plate 20;
An inner ring 260 positioned between the operating oil inlet groove 220 and the inner groove 230 and contacting the swash plate 20;
An inner ring step 261 formed on a part of the surface of the inner ring 260 and etched toward the center of the sliding part 200 formed with the hydraulic oil hole 220 and having fine grooves or a plurality of protrusions formed on its surface and,
The inner ring 260 includes a spring fixing groove 262 formed in a part of the surface of the inner ring 260 to be etched toward the center of the sliding portion 200 formed with the hydraulic oil hole 220, 262) and a drive ring (264) coupled to the top of the spring (263) such that the drive ring (264) is displaced from the swash plate 20 and the drive ring 264 reduces wear and tear of the upper surface of the drive ring 264 by relieving excessive friction and pressure by the elastic force of the spring 263 inserted at the bottom,
The drive ring 264 is characterized by forming a groove or a plurality of projections on the surface thereof to reduce the contact area with the swash plate 20. [
Description
The present invention relates to a piston shoe for a hydraulic pump, and more particularly, to a piston shoe for a hydraulic pump which further comprises an inner inner ring stage formed on a top surface of a piston shoe contacting the swash plate of the hydraulic pump, To a piston shoe for a hydraulic pump capable of preventing a piston shoe from being damaged by improving performance and lubrication performance.
Generally, a hydraulic pump is a driving device that converts a piston into a mechanical energy called a rotation of a drive shaft by reciprocating the piston using fluid energy called hydraulic pressure, and is widely used for heavy equipment such as construction equipment requiring a large power with excellent output density .
1 is a perspective view showing a state where a conventional piston pump for a hydraulic pump is fastened to a piston.
As shown in Fig. 1, a conventional piston shoe 1 for a hydraulic pump includes a
One end of the
The
The
That is, the
However, the piston shoe for a conventional hydraulic pump having only the characteristics of the hydrostatic bearing has a problem in that excessive wear is applied to the
In addition, the conventional piston shoe for a hydraulic pump has a problem in that the upper end surface of the piston shoe is damaged by abrasion on the upper surface, the replacement cost for replacing the upper end surface is increased, and the productivity is decreased.
Further, the conventional piston shoe for a hydraulic pump has a problem that the overall durability of the hydraulic pump is reduced and the mechanical efficiency of the hydraulic pump is reduced as the friction increases.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems of the prior art.
More specifically, it is an object of the present invention to provide a hydraulic shock absorber which is capable of reducing frictional and lubrication performance by reducing the contact area with the swash plate by forming a step at a central portion where the hydraulic oil passage and the swash plate are directly in contact with each other, So as to provide a piston shoe with a piston.
In order to achieve the above object, according to the present invention, there is provided a piston shoe having a step and an operation flow path for improving friction and lubrication performance, the piston shoe being coupled to a piston ball of a piston, In the piston shoe,
A
And a sliding part (200) formed on an upper end of the main body part (100) and in contact with the swash plate (20)
The sliding part (200)
An
A hydraulic
The upper surface of the sliding
The upper surface of the
An
An
An
The
The
As described above, according to the present invention, the operating oil supplied from the piston is transferred to the operating
1 is a view showing a conventional piston and a piston shoe;
2 is a block diagram of a piston shoe in which a step and an operation flow path are formed for improving friction and lubrication performance according to an embodiment of the present invention;
3 is a plan view and a cross-sectional view of a piston shoe in which a step and an operation flow path are formed for improving friction and lubrication performance according to an embodiment of the present invention;
4 is an exemplary view for explaining the shape change of the piston shoe at high temperature and high pressure;
5 is a view illustrating an inner ring step formed with fine grooves and protrusions according to an embodiment of the present invention;
6 is a cross-sectional view of a piston shoe in which a step and an operation flow path are formed for improving friction and lubrication performance according to another embodiment of the present invention;
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.
2 and 3, the piston shoe in which the step and working flow path for improving the friction and lubrication performance according to the present invention is formed is connected to the
More specifically, the piston shoe, which is engaged with the
In the case of the
4, the sliding
Therefore, in order to minimize the contact area of the
5, it is possible to further reduce the contact area with the
6, the
Further, the
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.
10: Piston
20: Swash plate
100:
200:
Claims (6)
A main body 100 having a piston ball housing 110 formed therein and coinciding with an outer circumferential surface of the piston ball 11, to which the piston ball 11 is inserted;
And a sliding part (200) formed on an upper end of the main body part (100) and in contact with the swash plate (20)
The sliding part (200)
An operating oil hole 210 penetrating from the center of the upper surface of the sliding portion 200 to the piston ball housing 110 of the main body 100 to allow hydraulic oil to flow therethrough so as to form a constricted central portion;
A hydraulic oil inflow groove 220 which is etched along the rim of the hydraulic oil hole 210 and is primarily transferred from the hydraulic oil hole 210 to the upper surface of the sliding portion 200;
The upper surface of the sliding portion 200 is etched in a ring shape spaced apart from the operating oil inflow groove 220 and connected to the working oil inflow groove 220 to receive the operating oil primarily transferred to the working oil inflow groove 220 An inner groove 230 to which the inner circumferential surface is secondarily transferred;
The upper surface of the sliding part 200 is spaced apart from the inner groove 230 and is etched in a ring shape along the upper edge of the upper surface of the sliding part 200 so that at least one incision part is formed on the side surface of the sliding part 200. [ An outer groove (240) for transferring the hydraulic fluid introduced into the sliding portion (200) and communicating with the outside;
An outer ring 250 positioned between the outer groove 240 and the inner groove 230 and contacting the swash plate 20;
An inner ring 260 positioned between the operating oil inlet groove 220 and the inner groove 230 and contacting the swash plate 20;
An inner ring step 261 formed on a part of the surface of the inner ring 260 and etched toward the center of the sliding part 200 formed with the hydraulic oil hole 220 and having fine grooves or a plurality of protrusions formed on its surface and,
The inner ring 260 includes a spring fixing groove 262 formed in a part of the surface of the inner ring 260 to be etched toward the center of the sliding portion 200 formed with the hydraulic oil hole 220, 262) and a drive ring (264) coupled to the top of the spring (263) such that the drive ring (264) is displaced from the swash plate 20 and the drive ring 264 reduces wear and tear of the upper surface of the drive ring 264 by relieving excessive friction and pressure by the elastic force of the spring 263 inserted at the bottom,
Wherein the drive ring (264) is formed with grooves or a plurality of projections on its surface to reduce a contact area with the swash plate (20), the piston shoe having a step and an operation flow path for improving friction and lubrication performance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150059951A KR101757971B1 (en) | 2015-04-28 | 2015-04-28 | Piston shoe of hydraulic pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150059951A KR101757971B1 (en) | 2015-04-28 | 2015-04-28 | Piston shoe of hydraulic pump |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20160128116A KR20160128116A (en) | 2016-11-07 |
KR101757971B1 true KR101757971B1 (en) | 2017-07-19 |
Family
ID=57530007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020150059951A KR101757971B1 (en) | 2015-04-28 | 2015-04-28 | Piston shoe of hydraulic pump |
Country Status (1)
Country | Link |
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KR (1) | KR101757971B1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3859777B2 (en) * | 1996-08-14 | 2006-12-20 | 東芝機械株式会社 | Variable displacement piston pump / motor |
JP2010222979A (en) * | 2009-03-19 | 2010-10-07 | Hitachi Constr Mach Co Ltd | Method for manufacturing slipper shoe of swash plate hydraulic rotating machine, and device for manufacturing slipper shoe |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100563697B1 (en) | 2000-12-28 | 2006-03-28 | 주식회사 다윈프릭션 | Method for manufacturing a piston shoe for piston hydraulic pump |
KR100468088B1 (en) | 2002-03-14 | 2005-01-26 | 한국기계연구원 | Piston shoe of hydraulic motor and pump |
KR101984316B1 (en) | 2013-05-28 | 2019-09-03 | 두산인프라코어 주식회사 | Piston slipper for hydraulic pump |
-
2015
- 2015-04-28 KR KR1020150059951A patent/KR101757971B1/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3859777B2 (en) * | 1996-08-14 | 2006-12-20 | 東芝機械株式会社 | Variable displacement piston pump / motor |
JP2010222979A (en) * | 2009-03-19 | 2010-10-07 | Hitachi Constr Mach Co Ltd | Method for manufacturing slipper shoe of swash plate hydraulic rotating machine, and device for manufacturing slipper shoe |
Also Published As
Publication number | Publication date |
---|---|
KR20160128116A (en) | 2016-11-07 |
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