KR101757971B1 - Piston shoe of hydraulic pump - Google Patents

Piston shoe of hydraulic pump Download PDF

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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
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KR
South Korea
Prior art keywords
groove
swash plate
piston
ring
hydraulic oil
Prior art date
Application number
KR1020150059951A
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Korean (ko)
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KR20160128116A (en
Inventor
권영준
Original Assignee
유원산업(주)
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Priority to KR1020150059951A priority Critical patent/KR101757971B1/en
Publication of KR20160128116A publication Critical patent/KR20160128116A/en
Application granted granted Critical
Publication of KR101757971B1 publication Critical patent/KR101757971B1/en

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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
    • 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
    • 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
    • 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

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

[0001] PISTON SHOE OF HYDRAULIC PUMP WITH STEP AND OPERATING PROCESS FOR IMPROVING FRICTION AND LUBRICATION PERFORMANCE [0002]

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 body portion 10 and a sliding portion 20.

One end of the main body 10 is coupled to the piston 2. The sliding portion 20 is located at the upper portion of the main body portion 10 and has a longitudinal section formed in a circular shape.

The upper end surface 30 of the sliding portion 20 is brought into contact with the swash plate so that the upper end surface 30 of the sliding portion 20 is rotated on the swash plate as the piston 2 is driven.

The upper end surface 30 of the sliding portion 20 rotates in contact with the swash plate 20 so that the sliding portion 20 of the piston shoe 20 reduces the wear due to the friction between the upper surface of the sliding portion 20 and the swash plate, Only the characteristics of the bearing are formed.

That is, the upper end surface 30 of the sliding portion 20 is processed so as to have a shape parallel to the contact surface of the swash plate so that the operating oil can be uniformly discharged to the outside of the upper surface 30 of the sliding portion 20.

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 upper end surface 30 of the piston shoe sliding portion 20 at the time of starting operation when the hydraulic pump is stopped and at a low speed of the hydraulic pump .

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.

KR Patent Registration No. 10-0468088 B1 KR Patent Registration No. 10-0563697 B1 KR Patent Publication No. 10-2014-0140184 A

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 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. [

As described above, according to the present invention, the operating oil supplied from the piston is transferred to the operating oil inflow groove 220, the inner groove 230, and the outer groove 240 to lubricate the upper surface of the sliding portion as a whole, An inner ring step 261 that is etched toward the center of the sliding part 200 where the operating oil hole 220 is formed is formed in a part of the surface of the swash plate 20 so that the contact area of the part directly contacting the swash plate 20 is reduced Friction and lubrication performance.

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 piston ball 11 of the piston 10, which is a component of the hydraulic pump, (100) in which a piston ball housing (110) coinciding with the outer circumferential surface of the piston ball (11) is formed therein and the piston ball (11) is inserted and engaged; And a sliding part 200 formed at an upper end of the main body part 100 and contacting the swash plate 20. The sliding part 200 includes a sliding part 200 extending from the center of the upper surface of the sliding part 200, An oil hole 210 penetrating to the piston ball housing 110 of the oil pan 100 to allow hydraulic oil to flow therethrough; 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 portion 200 is etched in a ring shape along the outer edge of the upper surface of the sliding portion 200 while being spaced apart from the inner groove 230. The upper surface of the sliding portion 200, An outer groove 240 for transferring to 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; And an inner ring step 261 formed on a part of the surface of the inner ring 260 to be etched toward the center of the sliding part 200 having the hydraulic oil hole 220 formed therein.

More specifically, the piston shoe, which is engaged with the piston ball 11 of the piston 10 and is in contact with the swash plate 20, constitutes the piston ball 11 of the piston 10, And a sliding part 200 formed at the upper end of the main body part and directly contacting the swash plate 20. [

In the case of the sliding part 200 of the piston shoe, the swash plate 200 is in direct contact with the swash plate and is rotated. As a result, considerable pressure and frictional force are exerted. If the frictional force can not be eliminated, Thereby causing a malfunction of the hydraulic motor.

4, the sliding portion 200 of the piston shoe is bent as a whole, and the contact portion with the swash plate 20 is limited to the center of the sliding portion 200, .

Therefore, in order to minimize the contact area of the inner ring 260 located at the center of the sliding part 200 with the swash plate 20, an inner ring step 261, which is etched toward the center of the sliding part 200, The inner ring step 261 reduces the contact area between the center of the sliding part 200 and the swash plate 20 to prevent the center of the sliding part 200 from being worn by excessive friction with the swash plate 20 Thereby preventing breakage of the piston shoe.

5, it is possible to further reduce the contact area with the swash plate 20 by forming fine grooves or a plurality of projections on the surface of the inner ring step 261, And the projections can be used in combination.

6, the inner ring 260 is formed with a spring fixing groove 272 formed on a part of the surface of the inner ring 260 to be etched toward the center of the sliding portion 200 having the hydraulic oil hole 220 formed therein, (262); A spring 263 inserted into the spring fixing groove 262; And a drive ring 264 coupled to an upper portion of the spring 263 such that the drive ring 264 is in contact with the swash plate 262 in place of the inner ring step 261 This driving ring 264 reduces wear on the upper surface of the driving ring 264 by relieving excessive friction and pressure by the elastic force of the spring 263 inserted in the lower portion of the driving ring 264. [

Further, the driving ring 264 can further reduce the contact area with the swash plate 20 by forming fine grooves or a plurality of projections on the surface, like the inner ring step 261, It is also possible to use a combination of the fine grooves and the projections.

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)

In a piston shoe engaged with a piston ball 11 of a piston 10, which is a component of a hydraulic pump, to make contact with the swash plate 20,
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. delete delete delete delete delete
KR1020150059951A 2015-04-28 2015-04-28 Piston shoe of hydraulic pump KR101757971B1 (en)

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KR1020150059951A KR101757971B1 (en) 2015-04-28 2015-04-28 Piston shoe of hydraulic pump

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Application Number Priority Date Filing Date Title
KR1020150059951A KR101757971B1 (en) 2015-04-28 2015-04-28 Piston shoe of hydraulic pump

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KR20160128116A KR20160128116A (en) 2016-11-07
KR101757971B1 true KR101757971B1 (en) 2017-07-19

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Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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

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