KR20170020031A - Double acting piston cylinder having improved cushion structure - Google Patents

Double acting piston cylinder having improved cushion structure Download PDF

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Publication number
KR20170020031A
KR20170020031A KR1020150114677A KR20150114677A KR20170020031A KR 20170020031 A KR20170020031 A KR 20170020031A KR 1020150114677 A KR1020150114677 A KR 1020150114677A KR 20150114677 A KR20150114677 A KR 20150114677A KR 20170020031 A KR20170020031 A KR 20170020031A
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South Korea
Prior art keywords
piston
chamber
space
flow path
hydraulic cylinder
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KR1020150114677A
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Korean (ko)
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KR101762296B1 (en
Inventor
박기성
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주식회사 정우유압
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Priority to KR1020150114677A priority Critical patent/KR101762296B1/en
Publication of KR20170020031A publication Critical patent/KR20170020031A/en
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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
    • 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
    • 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
    • F15B15/1447—Pistons; Piston to piston rod assemblies

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

The present invention relates to a dual-acting hydraulic cylinder which is installed in various kinds of equipment such as specially equipped vehicles, farm machinery, and tower wagons to lift equipment through advance and retreat of a piston and, specifically, to a dual-acting hydraulic cylinder with an improved cushion structure, which is provided with a cushion structure for delaying descent of the piston to mitigate shock according to the descent of the piston. The dual-acting hydraulic cylinder according to the present invention comprises: a cylinder body which has a cycle chamber provided with an upper flow path at the upper portion and a lower flow path at the lower portion; a piston which is disposed in an advance and retreat structure in the cycle chamber of the cylinder body; and a piston rod which is fixed to the piston, wherein a ring-shaped partition space portion is formed on the outer diameter of the piston to be concave, and the piston is provided with an orifice pipe which allows the lower cycle space of the cycle chamber to communicate with the partition space portion. When the piston moving down along the cycle chamber by an operation fluid injected to the upper cycle space of the cycle chamber through the upper flow path reaches a cushion section, the lower flow path is partitioned by the partition space portion formed on the outer wall of the piston, the operation fluid flowing into the partition space portion from the lower cycle space of the cycle chamber along the orifice pipe is discharged through the lower flow path, and the descent speed of the piston moving down is delayed to achieve buffering of the piston.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double acting hydraulic cylinder having an improved cushion structure,

The present invention relates to a double acting hydraulic cylinder having an improved cushion structure. More particularly, the present invention relates to a double acting hydraulic cylinder having an improved cushion structure, and more particularly, The present invention relates to a double acting hydraulic cylinder having an improved cushion structure which is provided with a cushion structure for delaying an impact caused by a descent of a piston.

As is known, the hydraulic cylinder is configured such that a piston is disposed in an advancing / retracting structure in an operating chamber of a cylinder housing in which an upper cover is disposed at an upper portion and a lower cover is disposed at a lower end.

An upper flow path and a lower flow path are provided in the upper and lower portions of the cylinder housing to allow the working fluid to flow in and out, respectively, and the working fluid supplied from the hydraulic pump flows into and out of the upper and lower flow paths, .

The hydraulic cylinder thus constructed is widely applied to various kinds of equipment such as a specially equipped vehicle and a farm machinery elevator work car, and the elevator of the equipment provided for the equipment is planned.

However, a physical collision between the reciprocating piston and the lower cover is inevitably generated in the lower portion of the stroke chamber in which the piston reciprocates in the hydraulic cylinder.

That is, since a high-load mechanism or a structure for the elevation is fixed to the rod of the piston, the impact between the piston and the lower cover of the cylinder housing is increased by the load of the structure or the structure, Not only the durability of the cylinder itself is deteriorated but also the durability and the driving stability of the apparatus including the structure or the apparatus are deteriorated.

In order to mitigate such an impact, various types of cushion structures are provided in the art to reduce the descending speed of the piston before the piston collides with the lower cover fastened to the lower portion of the cylinder housing.

In Korean Patent Laid-Open Publication No. 1998-0059108, a cushion plunger fluidly connected to the tip of a rod enters a flow path formed in a head cover, and the flow path is closed to generate a hydraulic pressure opposite to the traveling direction of the rod, It is planning to buffer.

In order to realize such a cushion structure, an orifice is additionally formed in addition to a flow path corresponding to the cushion plunger, and a check valve is additionally provided. Therefore, the cushion structure There is a problem in that the number of parts is large and the structure is complicated, thereby remarkably deteriorating productivity and assembling ability.

It is an object of the present invention, which is devised to overcome the above-described problems, to provide a cushion structure which is installed in various kinds of equipment such as a specially equipped vehicle and a farm equipment elevator work car to elevate the mechanism through advancement and retraction of the piston, There is provided a double acting hydraulic cylinder having an improved cushion structure for relieving an impact caused by a descent of a piston.

The above object is achieved by the following constitutions provided in the present invention.

In the double acting hydraulic cylinder having the improved cushion structure according to the present invention,

A cylinder housing having an upper cover at an upper portion thereof and a hollow cover at a lower portion thereof, an upper chamber having an upper passage formed therein and a lower passage formed therein; A piston disposed in the cylinder chamber in an advancing / retreating structure in the stroke chamber and dividing the stroke chamber into an upper stroke space and a lower stroke space; And a piston rod fixed to the piston, the double acting hydraulic cylinder comprising:

Wherein an annular partition space portion is formed in the outer diameter of the piston and an orifice tube is formed in the piston so as to communicate a lower space between the lower stroke space and the compartment space formed in the outer diameter of the piston,

The lower flow path is shielded by the compartment space portion formed on the outer wall of the piston when the piston descended along the stroke chamber by the working fluid injected into the upper stroke space of the stroke chamber reaches the cushion section,

The working fluid filled in the lower processing space flows through the compartment space along the orifice tube and is gradually discharged through the lower flow path so that the generation of impact between the piston and the lower cover descending through deceleration of the descending piston is minimized .

Preferably, the upper and lower tubular bodies are vertically spaced apart from each other, and the lower tubular body is configured to be smaller in diameter than the upper tubular body, while the upper tubular body and the lower tubular body are configured such that the lower tubular body and the lower tubular body are separated from each other, Wherein the working fluid flowing into the compartment space through the orifice tube formed in the descending piston is configured to be discharged stepwise through the upper tube body and the lower tube body so that the descending speed of the piston is gradually .

More preferably, the piston comprises a hollow body having a fastening portion formed on an inner wall thereof, a piston rod having a fastening portion is fastened to the hollow portion of the piston, a hollow portion of the hollow portion of the piston is opened with a lower portion, The working chamber is filled with a working fluid, and the lifting and lowering member is arranged in a lifting structure in the working chamber filled with the working fluid,

The lifting member is downwardly biased by the working fluid filled in the waxing chamber so that the lowering speed of the piston descending due to the elastic action between the lifting member lowered by the working fluid and the lower cover is reduced.

As described above, the double-acting hydraulic cylinder according to the present invention decelerates the descending speed of the piston that enters the cushion section by the flow control type cushion structure formed between the descending piston and the lower flow path.

Therefore, the piston forcibly injected into the upper stroke space is decelerated in a stepwise descent speed in the cushion section by the flow control type cushion structure, so that the impact between the piston and the lower cover disposed at the lower portion of the cylinder housing is minimized.

In the present invention, a cushion structure of a tongue-like shape is added to the piston so that the impact between the piston and the lower cover is relieved by the lifting member that is erected by the working fluid.

Particularly, since the cantilever type cushion structure is driven with a cushion structure of a flow rate control type, the shock due to the descent of the piston can be minimized by these cage-type cushion structure and the flow-control type cushion structure, The hydraulic cylinder has stable driving stability.

Fig. 1 shows the overall configuration of a double acting hydraulic cylinder having an improved cushion structure proposed as a preferred embodiment of the present invention,
FIG. 2 is a detailed structure of a cushion structure in a double acting hydraulic cylinder having an improved cushion structure proposed in the preferred embodiment of the present invention,
FIGS. 3 to 5 are operational states showing a sequential cushioning process of a piston according to a descent of a piston in a double acting hydraulic cylinder having an improved cushion structure proposed as a preferred embodiment of the present invention.

Hereinafter, a double acting hydraulic cylinder having an improved cushion structure proposed as a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows the overall configuration of a double acting hydraulic cylinder having an improved cushion structure proposed as a preferred embodiment of the present invention. Fig. 2 is a perspective view of a double-acting cylinder having an improved cushion structure proposed in the preferred embodiment of the present invention 3 to 5 show a double-acting hydraulic cylinder having an improved cushion structure proposed in the preferred embodiment of the present invention. In the double-acting hydraulic cylinder, a piston Of the cue.

As shown in FIG. 1, the double acting hydraulic cylinder 1 having an improved cushion structure proposed in the preferred embodiment of the present invention is formed by forming an upper cover 10a on the upper portion and a lower cover 10b on the lower portion A cylinder housing 10 made of a hollow tube and having a hollow administrative chamber 11 formed therein; A piston (20) arranged in an advancing / retreating structure in an operating chamber of the cylinder housing (10); And a piston rod (30) fixed to the piston (20).

1 and 2, the piston 20 is a hollow body having a fastening portion 22a formed on the inner wall of the hollow portion. The piston 20 has a fastening portion 31 formed at an end thereof, And at least one oil ring 22 is disposed on the outer diameter of the piston 20 in contact with the inner wall of the cylinder housing 10 to ensure airtightness between the piston 20 and the cylinder housing 30. [

At this time, the stroke chamber 11 of the cylinder housing 10 in which the piston 20 is disposed is vertically partitioned into an upper stroke space 11a and a lower stroke space 11b.

An upper flow path 12 communicating with a hydraulic pump (not shown) is formed in the upper portion of the administrative chamber 11 and a lower flow path 13 communicating with the hydraulic pump is formed in the lower portion of the administrative chamber 11, The piston 20 provided in the advancing and retreating structure in the cylinder 11 ascends and descends along the stroke chamber 11 by the working fluid forcedly injected into the stroke chamber 11 through the upper flow path 12 and the lower flow path 13, ).

For example, when the working fluid is forcibly introduced into the upper processing space 11a of the processing chamber 11 along the upper flow path 12 and the internal pressure of the upper processing space 11a rises, the lower processing space 11b Is discharged through the lower flow path 13 so that the piston 20 descends along the stroke of the stroke.

When the working fluid is forcibly introduced into the lower processing space 11b of the processing chamber 11 along the lower flow path 13 and the internal pressure of the lower processing space 11b rises, the upper processing space 11a Is discharged through the upper flow path 12, so that the piston 20 ascends along the stroke.

Therefore, the double acting hydraulic cylinder 1 according to the present embodiment basically moves up and down the piston 20 by the working fluid that is selectively forced through the upper flow path 12 and the lower flow path 13.

In the present embodiment, the double acting hydraulic cylinder 1 is provided with a cushion structure for relieving the shock when the piston is moved downward, and the piston 20 descending and the lower cover (not shown) disposed at the lower portion of the cylinder housing 10 10b. ≪ / RTI >

The cushion structure according to the present invention includes a flow control type that delays a discharge speed of a working fluid to delay a descending speed of a piston that enters a cushion section and a flow control type which resiliently supports a piston to be lowered, Each of the cushion structures minimizing the impact between the piston descending due to the organic and complementary cushioning action of these cushion structures and the bottom cover disposed below the cylinder housing.

The flow control type cushion structure includes an annular compartment space portion 23 formed so as to be recessed in the outer diameter of the piston 20 and a lower space portion 21b and a compartment space portion 23, And an orifice tube 24 for communicating with each other.

Here, the compartment space 23 is annularly formed on the outer diameter of the piston through turning, and the orifice tube 24 is formed through the piston 20 through drilling.

The upper tube 13a and the lower tube 13b are vertically spaced from each other in the lower flow path 13 and the lower tube 13b is formed so as to be smaller in diameter than the upper tube 13a, The speed of descent of the piston 20 is gradually decreased.

3 and 4, the piston 20, which is lowered along the stroke chamber 11 by the working fluid injected into the upper stroke space 11a of the stroke chamber 11 through the upper flow path 12, The lower flow path 13 is partitioned by the partition space portion 23 formed on the outer wall of the piston 20.

At this time, since the lower flow path 13 communicates with the lower processing space 11b only through the orifice tube formed in the piston 20, the lower processing space 11 is formed along the orifice tube 24, The working fluid flowing into the partition space portion 23 from the partition wall 11b is discharged through the lower flow path 13 to decelerate the descending speed of the descending piston 20 so as to move the piston 20 between the piston 20 and the lower cover 10b The occurrence of physical impact is suppressed.

4, when the piston first enters the cushion section as shown in Fig. 4, the compartment space section 23 communicates with the upper tube body formed in the lower flow path to achieve a primary deceleration, and then, as shown in Fig. 5 When the piston 20 descends further in the cushion section, the compartment space portion 23 is lowered at a speed slower than the first deceleration in communication with the lower tube 13b formed in the lower passage 13, Thereby minimizing the physical impact between the cover 10b.

The cantilever type cushion structure that is organically implemented with the flow control type cushion structure and decelerates the descending speed of the piston includes a lower open wedge chamber 25 formed in the piston 20 by fastening the piston rod 30, A distribution pipe 26 for communicating the buffer chamber 25 and the orifice pipe 24 with each other and an elevating member 27 disposed in the buffer chamber 25 in an ascending and descending structure.

Therefore, the lift member 27 is downwardly biased by the working fluid filled in the orifice tube 24 into the buffer chamber 25, and is lowered by the action of the lifting member 27 downwardly biased by the working fluid The descending speed of the piston 20 is decelerated.

5, the working fluid flowing into the cushioning chamber from the lower stroke space through the orifice tube and providing the lubrication force of the lifting member is discharged from the cushioning chamber through the lower flow path. Therefore, The lubrication force is canceled, and as a result, the piston can stably maintain the lowered state.

Thus, the double acting hydraulic cylinder 1 according to the present invention has a flow control type cushion structure for delaying the lowering speed of the piston 20 that enters the cushion section by delaying the discharge speed of the working fluid, Type cushion structure that minimizes the impact between the piston 20 and the lower cover 10b disposed at the lower portion of the cylinder housing 10 due to the organic and complementary cushioning action of these cushion structures The occurrence of the impact between the descending piston 20 and the lower cover disposed at the lower portion of the cylinder housing 10 can be minimized.

1. Double acting hydraulic cylinder
10. Cylinder housing 10a. Upper cover
10b. Lower cover 11. Administration room
11a. The upper processing space 11b. Lower administrative space
12. Upper flow path 13. Lower flow path
13a. Upper tube 13b. Lower tube
20. Piston 21. Oil ring
22. Hollow portion 22a. The fastening portion
23. Compartment space section 24. Orifice tube
25. Widening room 26. Distribution line
27. The elevating member
30. Piston rod 31. Coupling part

Claims (3)

A cylinder housing having an upper cover at an upper portion thereof and a hollow cover at a lower portion thereof, an upper chamber having an upper passage formed therein and a lower passage formed therein; A piston arranged in the cylinder chamber in an advancing / retreating structure in the stroke chamber, the piston dividing the stroke chamber into an upper stroke space and a lower stroke space; And a piston rod fixed to the piston, the double acting hydraulic cylinder comprising:
Wherein an annular partition space portion is formed in the outer diameter of the piston and an orifice tube is formed in the piston so as to communicate a lower space between the lower stroke space and the compartment space formed in the outer diameter of the piston,
The lower flow path is shielded by the compartment space portion formed on the outer wall of the piston when the piston descended along the stroke chamber by the working fluid injected into the upper stroke space of the stroke chamber reaches the cushion section,
The working fluid filled in the lower processing space flows through the compartment space along the orifice tube and is gradually discharged through the lower flow path so that the generation of impact between the piston and the lower cover descending through deceleration of the descending piston is minimized The hydraulic cylinder having an improved cushion structure. The method according to claim 1,
The upper and lower tubes are spaced apart from each other. The lower tube is configured to be smaller in diameter than the upper tube, while the upper tube and the lower tube are configured to be separated from each other by a partition space formed in a lowering piston Configured to communicate stepwise,
Wherein the working fluid flowing into the compartment space through the orifice tube formed in the descending piston is configured to be discharged stepwise through the upper tube body and the lower tube body so that the descending speed of the piston is gradually decreased. Double acting hydraulic cylinder with structure. The method according to claim 1,
The piston is formed of a hollow body having a fastening portion formed on an inner wall thereof. A piston rod having a fastening portion is fastened to the hollow portion of the piston, a hollow portion of the hollow portion of the piston is opened,
The working chamber is filled with a working fluid, and the lifting and lowering member is arranged in a lifting structure in the working chamber filled with the working fluid,
Wherein the lifting member is downwardly biased by the working fluid filled in the buffer chamber so that the lowering speed of the piston descending due to the elastic function between the lifting member lowered by the working fluid and the lower cover is reduced. Double acting hydraulic cylinder with cushion structure.
KR1020150114677A 2015-08-13 2015-08-13 Double acting piston cylinder having improved cushion structure KR101762296B1 (en)

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KR1020150114677A KR101762296B1 (en) 2015-08-13 2015-08-13 Double acting piston cylinder having improved cushion structure

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Application Number Priority Date Filing Date Title
KR1020150114677A KR101762296B1 (en) 2015-08-13 2015-08-13 Double acting piston cylinder having improved cushion structure

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KR20170020031A true KR20170020031A (en) 2017-02-22
KR101762296B1 KR101762296B1 (en) 2017-07-28

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102116293B1 (en) * 2019-08-09 2020-05-29 대호 (주) Link for tractor having function shock-absorbing
KR20210008750A (en) * 2019-07-15 2021-01-25 대호 (주) Control apparatus of link for tractor
KR20210008753A (en) * 2019-07-15 2021-01-25 대호 (주) Angle control apparatus of link for tractor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102420137B1 (en) * 2020-11-11 2022-07-12 이웅규 Pump using hydraulic cylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210008750A (en) * 2019-07-15 2021-01-25 대호 (주) Control apparatus of link for tractor
KR20210008753A (en) * 2019-07-15 2021-01-25 대호 (주) Angle control apparatus of link for tractor
KR102116293B1 (en) * 2019-08-09 2020-05-29 대호 (주) Link for tractor having function shock-absorbing

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