EP1652811A1 - Vérin télescopique à plusieurs étages pour déplacer des charges - Google Patents

Vérin télescopique à plusieurs étages pour déplacer des charges Download PDF

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Publication number
EP1652811A1
EP1652811A1 EP04425802A EP04425802A EP1652811A1 EP 1652811 A1 EP1652811 A1 EP 1652811A1 EP 04425802 A EP04425802 A EP 04425802A EP 04425802 A EP04425802 A EP 04425802A EP 1652811 A1 EP1652811 A1 EP 1652811A1
Authority
EP
European Patent Office
Prior art keywords
telescopic
fluid dynamic
fluid
elements
cylinders
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Withdrawn
Application number
EP04425802A
Other languages
German (de)
English (en)
Inventor
Ruggero Silimbani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HS Penta SpA
Original Assignee
HS Penta SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HS Penta SpA filed Critical HS Penta SpA
Priority to EP04425802A priority Critical patent/EP1652811A1/fr
Publication of EP1652811A1 publication Critical patent/EP1652811A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • 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
    • F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block

Definitions

  • the present invention relates to a telescopic fluid dynamic device for moving loads.
  • the present invention can be used in the sector of industrial vehicles, for moving or lifting the dump bodies of tractors and lorry trailers.
  • the devices currently used have a single telescopic fluid dynamic cylinder, consisting of a plurality of coaxial telescopic elements, mobile between a home position, in which the set of telescopic elements is almost fully contained in an outer jacket, and an operating position, in which the telescopic arm is fully extended, lifting the body to which it is connected.
  • the diameter of all of the telescopic elements is increased, thus strengthening the entire structure and consequently also the central part, subject to the greatest bending stresses.
  • this increases the size and weight of the device.
  • the aim of the present invention is to overcome the above-mentioned disadvantages by providing a telescopic fluid dynamic device for moving loads which has maximum structural resistance at the section where the stress due to deviation from the ideal axial direction is at its maximum.
  • Another aim of the present invention is to provide a device which, under equal conditions of resistance to bending and of weight and longitudinal extension in the fully extended configuration, allows a reduction of the radial dimension, or similarly which, under equal conditions of dimensions and ease of assembly, has greater resistance to bending in the sections subject to the greatest stresses.
  • the numeral 1 denotes as a whole a device for moving loads according to the present invention.
  • the device is of the type in which there are telescopic elements 6, 7 driven by an operating fluid.
  • the device characteristically comprises at least two opposite telescopic fluid dynamic cylinders 2 rigidly connected to one another, whose sliding telescopic elements 6, 7 are mobile between a home position, in which they are retracted, and an operating position, in which they are extended. Appropriately, in the home position the telescopic elements 6, 7 may be retracted inside a jacket 23.
  • the opposite telescopic fluid dynamic cylinders 2 are positioned in such a way that the respective thrust forces exerted by any pair of telescopic fluid dynamic cylinders 2 have at least two components orientated along the same line, but in opposite directions.
  • Each telescopic fluid dynamic cylinder 2 may consist of a different number of telescopic elements 6, 7 as illustrated in Figure 2A.
  • the same figures also shows how the corresponding telescopic elements 6, 7 of at least two different fluid dynamic cylinders 2 may, generally speaking, have different radial or longitudinal dimensions.
  • Figure 2 illustrates a preferred configuration in which there are two fluid dynamic cylinders 2 coaxial with one another, exerting two thrust forces along the same line, but in opposite directions, and having an equal number of telescopic elements 6, 7 positioned symmetrically relative to the jacket 23.
  • the same figure shows how the jacket 23, although it may alternatively be made in a single piece, comprises a sleeve 8 and two hollow housing elements 5, coaxial with the sleeve 8.
  • Each hollow housing element 5 positioned externally, in the home position receives a radially innermost telescopic element 6 and a plurality of intermediate telescopic elements 7.
  • the telescopic fluid dynamic cylinders 2 are connected to one another by a sleeve 8 at axially innermost ends 9 of the hollow housing elements 5.
  • the hollow housing element 5 and the telescopic element 6, 7 each have a first end 9 facing the sleeve 8, visible in detail in Figure 1B, and a second end 10, opposite the first end 9, visible in detail in Figure 1A.
  • said connecting ends 11 are also partly contained in the innermost telescopic element 6 of each telescopic fluid dynamic cylinder 2.
  • the connecting ends 11 are for connecting the device 1 to the dump body at one end, and to the bed of the tractor or the trailer at the other end.
  • a ring-shaped groove 16 which, as is widely known and used in the prior art, contains a guide ring.
  • the first base 9 of the telescopic elements 6, 7 has a rounded outward facing edge 17.
  • a plurality of pulling rings 18 integral, at the first bases 9, with the inner wall 19 of the intermediate telescopic elements 7.
  • a second projection 20 perpendicular to the longitudinal axis 3 common to the two telescopic fluid dynamic cylinders 2.
  • the second projection 20 and the second base 10 there is at least one ring-shaped groove 21, housing a seal which prevents the pressurised operating fluid from leaking out.
  • the quantity, shape and position of the seals to be applied to the zone close to the second bases 10 depend on the construction and operating requirements of a device for lifting loads, as is already well known and used in the prior art currently in use.
  • the second projection 20 acts as a contact surface and end of stroke stop for the first projection 15, preventing the intermediate telescopic elements 7 and the innermost telescopic element 6 from coming out of the device 1 completely.
  • the first projection 15 and the second projection 20 are ring-shaped and completely surround the perimeter of the immediately adjacent telescopic elements which they face.
  • the telescopic fluid dynamic cylinders 2 communicate with one another at the axially innermost ends 9 of the hollow housing elements 5, allowing the operating fluid to pass from one telescopic fluid dynamic cylinder 2 to the other.
  • the two telescopic fluid dynamic cylinders 2 form a single inner chamber 12.
  • the moving device 1 has means which allow the operating fluid to enter the telescopic fluid dynamic cylinders 2.
  • Said means comprise at least one hole 13 made at least at one connecting end 11 of a telescopic fluid dynamic cylinder 2 to allow the fluid to enter the inner chamber 12.
  • the moving device comprises an alternative embodiment in which the opposite telescopic fluid dynamic cylinders 2 are separate from one another, so that there are respective inner chambers 12 independently supplied with operating fluid.
  • the device has means for allowing the operating fluid to flow inside the telescopic fluid dynamic cylinders 2.
  • Said means comprise at least one hole 13 made at all of the connecting ends 11 of the telescopic fluid dynamic cylinders 2, allowing the fluid to enter the inner chambers 12.
  • the configuration with a single inner chamber 12 is preferably used, so as to make the structure lighter and simplify the supply apparatus.
  • the sliding of the telescopic elements 6, 7 is due to the thrust exerted by the pressurised operating fluid injected into the inner chamber 12 by a fluid dynamic pump of the known type and not illustrated.
  • the pressurised fluid fills the inner chamber 12 and pushes against a ring-shaped surface 22 of the first ends 9 of the telescopic elements 6, 7.
  • the telescopic element which comes out first is the radially outermost of the telescopic elements 6, 7, since it has a larger diameter and so the ring-shaped surface 22 of its first end 9 is larger: with the same pressure exerted equally by the operating fluid on all of the ring-shaped surfaces 22, a larger surface means a greater thrust force.
  • the telescopic elements 6, 7 gradually comes out, starting with the one with the largest diameter and ending with the one with the smallest diameter. This occurs almost simultaneously for both of the telescopic fluid dynamic cylinders 2, having corresponding telescopic elements with the same diameter. There may be a slight asynchronism, due to the different friction on the seals of the different telescopic elements 6, 7 of the telescopic fluid dynamic cylinder 2 connected to the bed of the tractor or the trailer. Such asynchronism does not cause significant disadvantages for operation of the device 1.
  • each telescopic fluid dynamic cylinder 2 is retracted by gradually reducing the pressure in the inner chamber 12 and using the weight of the load supported. Firstly, the telescopic element 6 with a smaller diameter is retracted, since its resistant surface on which the fluid acts is the smallest, followed by the remaining intermediate telescopic elements 7 with gradually increasing diameter.
  • extension of the moving device 1 lifts and angles the dump body relative to the bed on which it rested and with which it was parallel, whilst contraction of the device allows the body to return to the original position.
  • this device When the telescopic fluid dynamic cylinders are in the operating position, this device has greater resistance to bending since, close to the central position it has cross-sections with a diameter and surface greater than the cross-sections at the end of the device, thus counteracting the most intense bending moment close to the central position.
  • Another advantage is that, given the increased strength of the central jacket, during full extension of the adjacent telescopic elements inserted in it, the axial stress can be minimised.
  • a further advantage is linked to the fact that, with this configuration, under equal conditions of longitudinal extension and ease of assembly, it is possible to produce devices with smaller transversal dimensions, which are therefore lighter but stronger, or, on the contrary, under equal conditions of transversal dimensions and weight, devices with greater extension.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP04425802A 2004-10-27 2004-10-27 Vérin télescopique à plusieurs étages pour déplacer des charges Withdrawn EP1652811A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425802A EP1652811A1 (fr) 2004-10-27 2004-10-27 Vérin télescopique à plusieurs étages pour déplacer des charges

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425802A EP1652811A1 (fr) 2004-10-27 2004-10-27 Vérin télescopique à plusieurs étages pour déplacer des charges

Publications (1)

Publication Number Publication Date
EP1652811A1 true EP1652811A1 (fr) 2006-05-03

Family

ID=34932846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425802A Withdrawn EP1652811A1 (fr) 2004-10-27 2004-10-27 Vérin télescopique à plusieurs étages pour déplacer des charges

Country Status (1)

Country Link
EP (1) EP1652811A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101898734A (zh) * 2010-07-16 2010-12-01 宁波大学 一种液压多级延伸式撑顶扩张工具
CN101898736A (zh) * 2010-07-16 2010-12-01 宁波大学 一种液压多级自动延伸式撑顶工具
CN103527550A (zh) * 2013-10-15 2014-01-22 徐州科源液压股份有限公司 多级双铰轴倒置式油缸
CN104632776A (zh) * 2014-12-16 2015-05-20 四川重汽王牌兴城液压件有限公司 铰轴进油式自卸车用二级套筒液压缸
CN109026901A (zh) * 2018-09-06 2018-12-18 泸州市巨力液压有限公司 三级缓冲油缸

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT243038B (de) * 1964-01-20 1965-10-25 Norbert Hess Vorrichtung zur stufenweisen Erzielung von Arbeitswegen mittels hydraulischer oder pneumatischer Arbeitszylinder
FR2160378A1 (fr) * 1972-09-27 1973-06-29 Poclain Sa
FR2623571A1 (fr) * 1987-11-19 1989-05-26 Chapel Andre Dispositif a verin telescopique double en opposition
WO1992020927A1 (fr) * 1991-05-15 1992-11-26 Asahi Seiko Co., Ltd. Verin pneumatique a plusieurs etages

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT243038B (de) * 1964-01-20 1965-10-25 Norbert Hess Vorrichtung zur stufenweisen Erzielung von Arbeitswegen mittels hydraulischer oder pneumatischer Arbeitszylinder
FR2160378A1 (fr) * 1972-09-27 1973-06-29 Poclain Sa
FR2623571A1 (fr) * 1987-11-19 1989-05-26 Chapel Andre Dispositif a verin telescopique double en opposition
WO1992020927A1 (fr) * 1991-05-15 1992-11-26 Asahi Seiko Co., Ltd. Verin pneumatique a plusieurs etages

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101898734A (zh) * 2010-07-16 2010-12-01 宁波大学 一种液压多级延伸式撑顶扩张工具
CN101898736A (zh) * 2010-07-16 2010-12-01 宁波大学 一种液压多级自动延伸式撑顶工具
CN101898736B (zh) * 2010-07-16 2012-07-25 宁波大学 一种液压多级自动延伸式撑顶工具
CN101898734B (zh) * 2010-07-16 2012-07-25 宁波大学 一种液压多级延伸式撑顶扩张工具
CN103527550A (zh) * 2013-10-15 2014-01-22 徐州科源液压股份有限公司 多级双铰轴倒置式油缸
CN103527550B (zh) * 2013-10-15 2016-08-10 徐州科源液压股份有限公司 多级双铰轴倒置式油缸
CN104632776A (zh) * 2014-12-16 2015-05-20 四川重汽王牌兴城液压件有限公司 铰轴进油式自卸车用二级套筒液压缸
CN109026901A (zh) * 2018-09-06 2018-12-18 泸州市巨力液压有限公司 三级缓冲油缸

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