GB2264538A - Adjusting stroke of hydraulic cylinder - Google Patents
Adjusting stroke of hydraulic cylinder Download PDFInfo
- Publication number
- GB2264538A GB2264538A GB9303650A GB9303650A GB2264538A GB 2264538 A GB2264538 A GB 2264538A GB 9303650 A GB9303650 A GB 9303650A GB 9303650 A GB9303650 A GB 9303650A GB 2264538 A GB2264538 A GB 2264538A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- piston rod
- stroke
- hydraulic cylinder
- adjusting
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
-
- 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
- F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Power Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Preparing Plates And Mask In Photomechanical Process (AREA)
- Actuator (AREA)
Abstract
The arrangement comprises a piston 3, a first piston rod 4 and extending therefrom, a second piston rod 30 engaging with the piston as well as the first piston rod in a screw type engagement and adapted for adjusting the relative distance therebetween. A shaft 10 can adjust by cooperation with a coupling in rod 30 the stroke of the hydraulic cylinder. The piston and the first piston rod are provided with individual inner threaded parts which are formed to continue to each other. The second piston rod is provided with an outer threaded part which engages with the inner threaded parts of the piston and the first piston rod. This device simply adjusts the stroke of the hydraulic cylinder as required without deformation of the inner structure of the hydraulic cylinder. <IMAGE>
Description
DE'/ICE FOR ADJUSTING STROKE OF HYDRAULIC CYLINDER BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates in general to an imorovement of hydraulic cylinders, and more particularly to a device for adjusting stroke of the hydraulic cylinder which simply adjusts the stroke of the hydraulic cylinder as required without deformation of inner structure of the hydraulic cylinder.
Description of the Prior Art
As well known to those skilled in the art, hydraulic cylinders are used for transducing hydraulic energy into linear reciprocation and generally classified into an integrated type, a screwed type, a flange screwing type and a tie rod type in accordance with assembling techniques thereof.
With reference to Figs. 1 and 2 showing an embodiment of a known tie rod type hydraulic cylinder, respectively, this hydraulic cylinder comprises a plurality of, preferably four, tie rods 1 provided at corners of the cylinder as penetrating a rod cover 12 and a head cover 13 of the cylinder and tightened by nuts at both ends thereof. This hydraulic cylinder receives a piston 3 which reciprocates in the cylinder due to an inner pressure of the cylinder aooliea to a pressure surface of the piston 3.This piston 3 is provided with annular piston palings 5 for prevention of gas leakage through the annular gap between the inner surface of the cylinder and the outer surface of the piston 2. The piston packings 5 are fitted on the outer surface of the piston
In addition, this piston 3 is connected to a piston rod 4 which reciprocates in the cylinder as a result of reciprocation of the piston 3 caused by the hydraulic energy and transduces the hydraulic energy of a hydraulic fluid under pressure into a desired linear reciprocation. An O-ring 21 is interposed between the inner end of the piston 3 and the piston rod 4. In order to integrate the piston 2 with the piston rod 4, the piston 3 is screwed to the distal end of the piston rod 4 by employing a set screw 7.
The hydraulic cylinder further includes the rod cover 12 and the head cover 13 at opposite ends thereof for centering the piston rod 4 in the inner space of the cylinder. The rod cover 12 has a through hole for allowing the piston rod 4 to pass therethrough and this through hole is fitted with a bush 14 which is used for protection of the piston rod 4 such as from abrasion. This bush 14 also allows the piston rod 4 to smoothly pass through the rod cover 12 in order to smoothly reciprocate in the cylinder.
This bush 14 s provided at its outer end with a dust seal 15 -or prevention of introduction of outside dusts and foreign substances .rto the ins cue of the cyl ;nder. The hydraulic cylinder further includes at a side thereof a cushion valve 22 for controlling the cushion and at the other side thereof a check valve 23 for controlling the flowing direction of the hydraulic fluid.
In operation of this tie rod type hydraulic cylinder, the hydraulic fluid under pressure, preferably pressurized hydraulic oil, delivered from a hydraulic pump (not shown) is introduced into the inside of the cylinder through a first oil port, or a first oil inlet 18 in order to fill a right-side oil chamber 25 of the cylinder as described Fig. 1. At this state, the continuous delivery of the hydraulic oil under high pressure from the hydraulic pump causes the inner pressure of the oil chamber 25 to be increased and, as a result, pushes the piston 3 along with the piston rod 4 leftnards. This leftward linear movement of the piston 3 and the piston rod 4 caused by the increasing pressure of the oil chamber 25 continues until the distal end of the piston 3 comes into contact with the rod cover 12.
At this state, the hydraulic oil under pressure delivered from the hydraulic pump is received in left-side oil chamber 26 of the cylinder through a second oil port, or a second oil inlet 19 in order to fill this chamber 26. As a result of continuous delivery of the hydraulic oil under high pressure from the hydraulic pump, the inner pressure of the oil chamber 3 is increased and pL'S:es the piston 3 along - itn he piston rod A rightwards.Here, the stroke of the piston 3 in the hydraulic cylinder is generally defined as the maximum moving distance of the piston 3 in the cylinder
However, it has been noted that the known hydraulic cylinder regardless of its type has a problem in adjusting the stroke of the pistcn. Otherwise stated, when it is reauired to adjust the stroke or the piston, the hydraulic cylinder should be disassembled and equipped with an additional part, a a stroke adjusting part, for adjusting the stroke by deforming the inner structure of the cylinder. Or, a new hydraulic cylinder satisfying the desired stroke should be substituted for the used hydraulic cylinder.In this regard, the problem of the known hydraulic cylinder is resided in that the addition of stroke adjusting part to the cylinder or substitution of a new hydraulic cylinder for the used one involves remarkable capital investment and time consumption as well as quality deterioration of the hydraulic cylinder.
Furthermore, in the case of use of several hydraulic cylinders having different strokes at the same time, the hydraulic cylinders should be equipped with individual stroke adjusting parts or substituted by new ones having desired strokes one by one in order to adjust their strokes, thereby causing the aforementioned problem to be worse.
SU'MMARY OF THE INVENTION t is, therefore, an object of the present invention to provide a device for adjusting stroke of a hydraulic cylinder in which the aforementioned problem can be overcome and which simply adjusts the stroke of the hydraulic cylinder as required without deformation of the inner structure of the hydraulic cylinder In accordance with a preferred embodiment of the present invention, the aforementioned object can be accomplished by providing a device for adjusting stroke of a hydraulic cylinder comprising a piston, a first piston rod being integrated with the piston and horizontally extending therefrom, a second piston rod. engaging with the piston as well as the first piston rod in a screw type engagement and adapted for adjusting a relative distance therebetween, rotational force transferring means for transferring a rotational force for adjusting the stroke to the second piston rod, and stroke adjusting means for adjusting, in cooperation with said rotational force transferring means, the stroke of the hydraulic cylinder.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed descriptIon taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a partially sectioned view of an embodiment of a known tie rod type hydraulic cylinder;
Fig. 2 is a cross sectioned view of the hydraulic cylinder of Fig. 1;
Fig. 3 is a view corresponding to Fig. 1, but showing a hydraulic cylinder combined with an embodiment of a device for adjusting stroke of a hydraulic cylinder in accordance with the present invention;
Fig. 4 is a partial exploded persDective view of the device for adjusting stroke of the hydraulic cylinder of Fig.
3; and
Fig. 5 is a perspective view of another embodiment of a stroke adjusting shaft of the device in accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
For convenience of description, the present invention will be described hereinbelow as referring to a tie rod type hydraulic cylinder, however, please note that this invention can be also applied to hydraulic cylinders of other types, such as an integrated type, a screwed type, a flange screwing type and etc.
With reference to Figs. S to 5, Fig. 3 shows a tie rod type hydraulic cylinder combined with an embodiment of a device for adjusting stroke of the hydraulic cylinder (hereinafter, the device being referred to simply as "the stroke adjusting device" or 'the device") according to the present invention, Fig. 4 shows a construction of the stroke adjusting device and Fig. 5 shows another embodiment of a stroke adjusting shaft of the stroke adjusting device of this invention.
As depicted in Fig. 3 and 4, the hydraulic cylinder of this invention comprises, like the prior art, a plurality of, preferably four, tie rods 1 provided at corners of the cylinder as penetrating a rod cover 12 and a head cover 13 of the cylinder and tightened by nuts at both ends thereof.
The hydraulic cylinder receives a piston 3 which reciprocates in the cylinder due to an inner pressure of the cylinder caused by a hydraulic fluid under pressure and applied to the pressure surface of the piston 3. This piston 3 is integrally formed with a first piston rod 4 which extends from the piston leftwards and reciprocates in the cylinder as a result of reciprocation of the piston 3 caused by the hydraulic energy of the hydraulic fluid, thereby transducing the hydraulic energy into a desired linear reciprocation. The piston S and the first piston rod 4 are provided wIth individual inner threaded parts 30 and 31 at their inner surfaces.Here, the piston 3 and the first piston rod 4 are integrally formed with each other and their inner threaded parts 30 and 31 are horizontally formed to continue to each other. On the other hand, the piston 3 is provided with annular piston packings 5 at its outer surface for preventIon of gas leakage.
The piston R and the first piston rod 4 engages with a second piston rod 6. This second piston rod 6 has an outer threaded part 33 on its outer surface and this threaded part 33 engages with the inner threaded parts 30 and 31 and, as a result, achieves a displaceable engagement of the second piston rod 6 with the integrated body of the piston 3 and the first piston rod A. In this regard, the relative distance between the second piston rod 6 and the integrated body is adjustable. The second piston rod 6 has at least one oil through hole 5a for allowing the hydraulic oil under pressure to pass therethrough. This second piston rod 6 is provided with an inner threaded part at an end thereof for engaging with an outer threaded coupling 8.This coupling 8 is screwed and fixed to the end of the second piston rod 6 by employing a set screw 7 and has a hexagonal center through hole 9.
This hexagonal center through hole 9 of the coupling S receives a stroke adjusting shaft 10 of a hexagonal appearance. This shaft 10 is provided with a through hole 11 which jS adapted to rotate the shaft 10 and pernenå.cular to the longitudinal axis of the shaft 10. Like the prior art, the hydraulic cylinder of this invention further includes the rod cover 12 and the head cover 13 at opposite ends thereof.
In addition, the rod cover 12 is provided with a bush 14 for protection of the first piston rod 4 such as from abrasion and for allowing the first piston rod 4 to smoothly pass through the rod cover 12 in order to smoothly reciprocate in the cylinder. This bush 14 is provided at its outer end with a dust seal 15 for prevention of introduction of outside dusts and foreign substances into the inside of the cylinder. The head cover 13 is provided with bearings 16 for causing the rotation of the stroke adjusting shaft 10 to be smoothly carried out. In order to maintain the stroke adjusting shaft 10 at its place, a snap ring 17 is provided at an end of the shaft 10 out of the head cover 13.
In operation of the hydraulic cylinder of this invention, the hydraulic fluid under pressure, preferably pressurized hydraulic oil, delivered from a hydraulic pump (not shown) is received in the inside of the cylinder through a first oil inlet 18 in order to fills a right-side oil chamber 25 as described Fig. 3. The oil under pressure in the chamber 25 is, thereafter, introduced into an oil chamber 28, which is provided between the piston 3 and the second piston chamber 6, through the oil through hole 6a and fills the chamber 28. At this state, the continuous delivery of the hydraulic oil under high pressure from the hydraulic pump causes the inner pressure of the oil chamber 28 to be increased and, as a result, pushes the piston 3 along with the first piston rod 4 leftwards.This leftward linear movement of the piston 3 and the piston rod 4 continues until left-side end of the piston 3 comes into contact with the rod cover 12.
At this state, the hydraulic oil under pressure delivered from the hydraulic pump is introduced into a left-side oil chamber 29 of the cylinder through a second oil inlet 19. As a result of continuous introduction of the hydraulic oil into this chamber 29, the inner pressure of this chamber 29 is increased and this pushes the piston 3 along with the first piston rod I rightwards.
When it is required to adjust the stroke of the piston 3, a turning member, such as a turning bar (not shown), is inserted into the through hole 11 of the stroke adjusting shaft 10. Thereafter, this turning member is rotated in a direction and this causes the shaft 10 to be rotated. At this time, the rotational force of the shaft 10 is transferred to the coupling 8 and in turn to the second piston rod 6 engaging with the coupling 8. Hence, the second piston rod 6 is rotated in the same direction as that of the turning member and, as a result, linearly moves leftwards or rightwards with respect to the integrated body of the piston 3 and the first piston rod 4, thereby adjusting the stroke of the hydraulic cylinder as required.
For example, when the stroke adjusting shaft 10 is rotated clockwise, the second piston rod 6 moves toward the first piston rod 4 and this makes the relative distance between the two piston rods 4 and 6 be shortened. Hence, the stroke of the piston 3 is increased. On the contrary, when the stroke adjusting shaft 10 is rotated counterclockwise, the second piston rod 6 moves to become more distant from the first piston rod 4 and this makes the distance between the two piston rods 4 and 6 be lengthened. Hence1 the stroke of the piston 3 is reduced. Accordingly, the stroke of the piston S of the hydraulic cylinder can be simply adjusted as desired without necessity of deformation of the inner structure of the hydraulic cylinder.
On the other hand, when there is a spacial restriction in equipping the hydraulic cylinder with the stroke adjusting device, the stroke adjusting shaft 10 may be constructed to be shortened as depicted in Fig. 5 showing another embodiment of the shaft 10. In this embodiment, the stroke adjusting shaft 10 is longitudinally provided with a polygonal depression, for example, a hexagonal depression 20 at the center of the outside end thereof. In this case, the adjustment of the stroke of the piston 3 is achieved by employing a turning member, such as a wrench, which is inserted into the oeoress-cn 20 and rotated in a desired ircticn.
As described above, the present invention provides a device for adjusting stroke of a hydraulic cylinder comprising a second piston rod which engages with an integrated body of a piston and a first piston rod in a screw type and is rotated in order to relatively linearly move with respect to the piston and the first piston rod. Hence, this device adjusts the relative distance between the first and second piston rods and the stroke of the piston. In accordance with this invention, the stroke of the hydraulic cylinder is simply adjusted as desired without necessity of deformation of the inner structure of the hydraulic cylinder. Thus, this invention provides an advantage in that it achieves the adjustment of stroke of the hydraulic cylinder without involving additional capital investment and time consumption and, furthermore, improves quality of the hydraulic cylinder and, as a result, operational efficiency and reliabilIty of the hydraulic cylinder.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims
Claims (9)
1. A device for adjusting stroke of a hydraulic cylinder comprising:
a piston;
a first piston rod being integrated with said piston and horizontally extending from said piston;
a second piston rod movably engaging with said piston and said first piston rod in a screw type engagement and being adapted for adjusting a relative distance between it and said piston;
rotational force transferring means for transferring a rotational force for adjusting the stroke of said hydraulic cylinder to said second piston rod; and
stroke adjusting means for adjusting, in cooperation with said rotational force transferring means, the stroke of said hydraulic cylinder.
2. A device according to claim 1, wherein said piston and said first piston rod are provided with individual inner threaded parts at their inner surfaces, said inner threaded parts being formed to continue to each other; and said second piston rod is provided with an outer threaded part on its outer surface, said outer threaded part engaging with said inner threaded parts of the piston and the first piston -rod.
3. A device according to claim 1, wherein said rotational force transferring means comprises a coupling engaging with and being fixed to said second piston rod.
4. A device according to claim 3, wherein said coupling has a center through hole, and said stroke adjusting means comprises a shaft being inserted in and rotating said coupling.
5. A-device according to claim 3, wherein said coupling is screwed to said second piston rod by a set screw.
6. A device according to claim 4, wherein said shaft is provided at its outer end with a vertical through hole for rotating said shaft.
7. A device according to claim 4 or 6, wherein said shaft is provided at its outer end with a longitudinal depression for rotating said shaft.
8. A device according to claim 2, wherein said second piston rod has at least one oil through hole for allowing a hydraulic fluid under pressure to pass therethrough.
9. A device for adjusting the stroke of a hydraulic cylinder substantially as hereinbefore described with reference to and as illustrated in Figs 3 to 5 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920002810A KR950007477B1 (en) | 1992-02-24 | 1992-02-24 | Phase shift mask and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9303650D0 GB9303650D0 (en) | 1993-04-07 |
| GB2264538A true GB2264538A (en) | 1993-09-01 |
Family
ID=19329420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9303650A Withdrawn GB2264538A (en) | 1992-02-24 | 1993-02-23 | Adjusting stroke of hydraulic cylinder |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR950007477B1 (en) |
| GB (1) | GB2264538A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2351788A (en) * | 1999-07-06 | 2001-01-10 | Draftex Ind Ltd | A gas spring of adjustably variable extent |
| DE19942273A1 (en) * | 1999-09-04 | 2001-04-12 | Gutos Metallschliessen Gmbh & | Device to adjust end position of piston rod has guide sleeve co-axial with piston rod and extending and movable in axial direction, and adjusting sleeve in functional engagement with guide sleeve |
| WO2022067275A3 (en) * | 2020-09-25 | 2022-06-16 | Sullivan, Higgins, And Brion Power Plant Engineering, Llc | Apparatus and method of fluid powered linear actuators with adjustable stops |
| US12044257B2 (en) | 2021-11-01 | 2024-07-23 | Sullivan, Higgins, and Brion PPE, LLC | Apparatus and method of fluid powered linear actuators with adjustable stops |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505822A (en) * | 2019-01-17 | 2019-03-22 | 大连诺美液压件有限公司 | A kind of hydraulic cylinder with stroke adjustment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1310051A (en) * | 1969-04-03 | 1973-03-14 | Lucas Industries Ltd | Multiposition fluid-operable piston and cylinder unit |
| GB1465520A (en) * | 1973-09-04 | 1977-02-23 | Kloeckner Werke Ag | Fluid-pressure actuated piston and cylinder unit |
| GB1525369A (en) * | 1976-04-07 | 1978-09-20 | Voest Alpine Montan Ag | Fluid pressure-operable actuator |
| GB2190171A (en) * | 1986-05-08 | 1987-11-11 | Apoloniusz Edward Warzynski | Adjustable cylinder stroke |
-
1992
- 1992-02-24 KR KR1019920002810A patent/KR950007477B1/en not_active IP Right Cessation
-
1993
- 1993-02-23 GB GB9303650A patent/GB2264538A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1310051A (en) * | 1969-04-03 | 1973-03-14 | Lucas Industries Ltd | Multiposition fluid-operable piston and cylinder unit |
| GB1465520A (en) * | 1973-09-04 | 1977-02-23 | Kloeckner Werke Ag | Fluid-pressure actuated piston and cylinder unit |
| GB1525369A (en) * | 1976-04-07 | 1978-09-20 | Voest Alpine Montan Ag | Fluid pressure-operable actuator |
| GB2190171A (en) * | 1986-05-08 | 1987-11-11 | Apoloniusz Edward Warzynski | Adjustable cylinder stroke |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2351788A (en) * | 1999-07-06 | 2001-01-10 | Draftex Ind Ltd | A gas spring of adjustably variable extent |
| GB2351788B (en) * | 1999-07-06 | 2003-02-26 | Draftex Ind Ltd | Gas spring |
| DE19942273A1 (en) * | 1999-09-04 | 2001-04-12 | Gutos Metallschliessen Gmbh & | Device to adjust end position of piston rod has guide sleeve co-axial with piston rod and extending and movable in axial direction, and adjusting sleeve in functional engagement with guide sleeve |
| WO2022067275A3 (en) * | 2020-09-25 | 2022-06-16 | Sullivan, Higgins, And Brion Power Plant Engineering, Llc | Apparatus and method of fluid powered linear actuators with adjustable stops |
| US12044257B2 (en) | 2021-11-01 | 2024-07-23 | Sullivan, Higgins, and Brion PPE, LLC | Apparatus and method of fluid powered linear actuators with adjustable stops |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9303650D0 (en) | 1993-04-07 |
| KR930018675A (en) | 1993-09-22 |
| KR950007477B1 (en) | 1995-07-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |