EP2385259A1 - Flüssigkeitsbetätigter Betriebszylinder für einen Materialtransportträger - Google Patents

Flüssigkeitsbetätigter Betriebszylinder für einen Materialtransportträger Download PDF

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Publication number
EP2385259A1
EP2385259A1 EP10425153A EP10425153A EP2385259A1 EP 2385259 A1 EP2385259 A1 EP 2385259A1 EP 10425153 A EP10425153 A EP 10425153A EP 10425153 A EP10425153 A EP 10425153A EP 2385259 A1 EP2385259 A1 EP 2385259A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
sections
section
coating
layer
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Withdrawn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
EP10425153A
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English (en)
French (fr)
Inventor
Fabrizio Pitacco
Michele Tosti
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.)
Protec Surface Technologies SRL
Original Assignee
Protec Surface Technologies SRL
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 Protec Surface Technologies SRL filed Critical Protec Surface Technologies SRL
Priority to EP10425153A priority Critical patent/EP2385259A1/de
Publication of EP2385259A1 publication Critical patent/EP2385259A1/de
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to a fluid-operated cylinder for a vehicle adapted to handle materials of the type pointed out in the preamble of the first claim.
  • the cylinder is suitable for use in a vehicle for handling material and, more specifically, in the vehicle's devices adapted to handle the material relative to the vehicle itself. It is therefore suitable to be disposed in the region of the trailers, buckets for excavators, devices for snow-tamping in ski runs or in the salt spreading means.
  • the cylinder is suitable for arrangement on a truck or lorry provided with a tipping body and, more specifically, it is adapted to be disposed at the body's platform enabling movement thereof.
  • a mechanism adapted to tilt said body which mechanism is usually disposed under the body. It consists of a piston, a cylinder, commonly called tipping cylinder, and a motor adapted to move a fluid, usually oil, enabling actuation of the mechanism itself.
  • the tipping cylinder is a telescopic cylinder which consists of a series of steel tubes, referred to as "stages” or “sections”, of a progressively decreasing diameter, each of which is nested into the tube having an immediately greater diameter.
  • the cylinder is made up of an external section remaining stationary during extension of the cylinder and adapted to receive the other sections inside it; an inner section constituting the piston and driving extension and contraction of the cylinder; and, if contemplated, at least one intermediate section, the number of said intermediate sections determining the maximum elongation of the cylinder.
  • the above mentioned mechanism is activated and therefore the body is lifted to such an extent that the contents thereof can come out.
  • the body is rotated through about 60° relative to a pivot disposed on the end portion of the lorry, owing to elongation of the tipping cylinder.
  • tilting of the lorry is made possible by the piston thrust that causes the sections to come out of their housings enabling the telescopic cylinder to reach its maximum extension.
  • Said aggressiveness is due to the fact that the work environment is characterised by a high amount of suspended powders that, when they lay down on the cylinder's sections give rise to an increase in the friction between said elements and therefore to deterioration of same.
  • the powder particles tend to be located in the contact region between two sections giving rise to abrasion of the latter by rubbing.
  • most of the suspended particles consists of basic substances such as lime for example, that are particularly aggressive towards the fluid-operated cylinder.
  • said coatings can only ensure a limited duration of the telescopic cylinder, as they are not able to ensure an appropriate protection against the action of physico-chemical agents.
  • these coatings usually are obtained by means of galvanic techniques and/or consist of chemical coatings that do not provide an appropriate protection against corrosion and abrasion.
  • the technical task underlying the present invention is to conceive a fluid-operated cylinder for a vehicle adapted to handle materials which is able to substantially obviate the mentioned drawbacks.
  • Another important aim of the invention is to devise a cylinder that is provided with an outer surface of high and durable resistance to rubbing and to the action of the chemical agents of the suspended particles.
  • a further aim of the invention is to provide a cylinder of reduced bulkiness.
  • a still further aim of the invention is to provide a fluid-operated cylinder that is able to ensure a low friction and high performance over the whole lifetime thereof.
  • a not least aim is to conceive a fluid-operated cylinder that is particularly suitable for use in lorries as the tipping cylinder thereof.
  • the fluid-operated cylinder in accordance with the invention has been generally identified by reference numeral 1 .
  • vehicles 2 for handling material which vehicles are usually employed in the work field and more specifically in the building field, and for instance consist of lorries with a tipping body, trailers, excavators, devices for snow-tamping of ski runs or in salt spreading means.
  • the fluid-operated cylinder 1 is of the telescopic type. namely it is adapted to vary its length during operation enabling movement of body 2a.
  • the cylinder 1 has a tubular shape, i.e. characterised by a major extension direction 1a .
  • it has a cylindrical shape and in known manner comprises at least two sections 4 having extension directions substantially coincident with the direction 1a.
  • the cylinder 1 has a prismatic shape, a polyhedral shape or the like.
  • fluid-operated cylinder or merely “cylinder” is understood as indicating a component of any shape, a cylindrical, prismatic or similar shape for example, used for creating a relative motion between two parts.
  • said two sections 4 are: an external one 4a , adapted to at least partly enclose the fluid-operated cylinder 1, and an inner one 4b moved by device 3 and adapted to slide along said major extension direction 1 a relative to said outer section 4a.
  • the outer surface 4c of at least one of said sections 4 has a multilayer coating 5 .
  • coating 5 is obtained at least on the outer surface of the inner section 4b which, during motion of cylinder 1, slides against the inner surface of the outer section 4a.
  • the multilayer coating 5 comprises at least two superimposed layers 5a , 5b preferably laid down sequentially by high vacuum processes.
  • high vacuum process is understood as identifying those coating processes carried out in a vacuum chamber, i.e. characterised by a very low inner pressure.
  • the chamber where coating 5 is obtained is a high vacuum chamber.
  • the PVD and PECVD techniques are known.
  • the PVC (Physical Vapour Deposition) process is for example an atomic deposition process in which the material to be laid down is evaporated from a solid phase and transferred in the vapour phase to the pieces to be coated where it lays down forming a thin film.
  • the PECVD (Plasma-enhanced chemical vapour deposition) process uses a precursor already in the vapour phase, containing the chemical species to be laid down that are made available for film formation through the action of the plasma.
  • Coating 5 is characterised by an overall thickness advantageously included between 1 and 30 ⁇ m.
  • coating 5 is adapted to ensure to a section 4, a high resistance to wear and to the action of chemical agents. In addition it is adapted to ensure a low friction between sections 4 and preferably provides self-lubricating features to the coated parts. Therefore at least the outermost layer 5a of coating 5 contains materials of high hardness such as in particular the ceramic or covalent compounds, for instance the carbon compounds like carbides, carbonitrides or oxycarbonitrides, or nano particles of various nature.
  • the outer layer 5a preferably contains carbon.
  • it is a layer of DLC (Diamond like carbon).
  • the DLC is a carbon-based material with an amorphous structure exhibiting some of the diamond features and is characterised by specific chemical bonds of the sp3 type.
  • the layer adjacent to the outer one 5a i.e. the inner layer 5b, is adapted to ensure adhesion between the outer layer 5a and a section 4.
  • this layer 5b helps in improving the anticorrosive and tribologic properties of coating 5.
  • the inner layer 5b therefore consists of a material adapted to perform the above function such as silicon carbide, pure metal, nitrided metal, carbonitrided metal or a combination thereof.
  • the fluid-operated cylinder 1 in known manner can include at least one intermediate section 4d adapted to be disposed between the outer section 4a and inner section 4b, as shown in Fig. 2 .
  • the intermediate section 4d is suitable to slide relative to the outer section 4a moved by the inner section 4b owing to the particular geometry of the two sections 4b and 4d. It has the above mentioned coating 5 on the outer surface 4c, which coating is characterised by its outermost layer made of DLC.
  • device 3 actuates the fluid-operated cylinder 1 which, starting to increase its length, causes rotation of body 2a thus enabling the material loaded therein to begin coming out.
  • device 3 due to the presence of the motor, pushes a fluid, usually oil under pressure, which exerts a force on the inner section 4b causing movement of said section along the direction 1a.
  • the inner section 4b first surrounded by the outer section 4a, therefore starts coming out from said outer section 4a and, simultaneously, drags along with it the section 4d, if any. Said motion terminates when the cylinder 1 has reached its maximum extension, i.e. when the intermediate 4d and inner 4b sections have the respective outer surfaces 4c almost fully in sight.
  • the invention comprises a new process for manufacturing a fluid-operated cylinder 1 for a vehicle adapted to handle material.
  • the process comprises a known starting manufacturing step in which the sections 4 are created using techniques involving extrusion, removal of chips, casting or other similar techniques.
  • the process contemplates that at least the inner section 4b will be submitted to a series of deposition steps carried out in sequence or, alternatively, substantially simultaneously and during which coating 5 is obtained.
  • said series of deposition steps is also applied to the intermediate section 4d and, in particular, all sections 4 are submitted to deposition.
  • the series of steps involves at least two deposition steps in each of which a coating layer 5 is made.
  • at least one of the deposition steps forms on the outer surface 4c, a layer of high-hardness materials such as in particular ceramic or covalent compounds and for instance carbon compounds like carbides, carbonitrides or oxycarbonitrides, or nano particles of various nature.
  • the layer thus made is a DLC layer.
  • said deposition step of the DLC layer is the last one of the above mentioned series so that the last outermost layer of coating 5 is the one made of DLC.
  • the step preceding that for making the DLC layer creates a layer of material adapted to ensure adhesion of the DLC layer to the underlying material.
  • this layer of material improves the anticorrosive and tribologic features of coating 5.
  • Said series of deposition steps carried out in PVD and/or PECVD plants can take place in one or more chambers suitably modified or expressly made. Furthermore, in the deposition steps it is possible to combine, during manufacture of a coating 5, different PVD and/or PECVD techniques in a joint or separated manner. It is also possible to vary the density, thickness and composition of coating 5 by changing the deposition duration of each individual layer during the process.
  • the invention enables important advantages to be achieved.
  • the fluid-operated cylinder thus made is characterised by a high resistance to mechanical corrosion, i.e. due to wear, and chemical corrosion, owing to the presence of the DLC layer which is inert to the action of chemical agents such as acids, bases, solvents.
  • said layer 5a made of DLC allows high sliding features to be obtained due to the low coefficient of friction and the self-lubricating properties belonging to the DLC.
  • vehicle 2 is adapted to work in any work environment without running the risk of deteriorating cylinder 1.
  • a further advantage resides in the high reliability of cylinder 1 and, as a result, of vehicle 2.
  • coating 5 and in particular the final DLC layer allow accomplishment of a cylinder 1 of reduced bulkiness although of high strength and duration.
  • Another advantage is represented by a reduction in costs and a less strong environmental impact due to the DLC layer.
EP10425153A 2010-05-06 2010-05-06 Flüssigkeitsbetätigter Betriebszylinder für einen Materialtransportträger Withdrawn EP2385259A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10425153A EP2385259A1 (de) 2010-05-06 2010-05-06 Flüssigkeitsbetätigter Betriebszylinder für einen Materialtransportträger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10425153A EP2385259A1 (de) 2010-05-06 2010-05-06 Flüssigkeitsbetätigter Betriebszylinder für einen Materialtransportträger

Publications (1)

Publication Number Publication Date
EP2385259A1 true EP2385259A1 (de) 2011-11-09

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ID=42829982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10425153A Withdrawn EP2385259A1 (de) 2010-05-06 2010-05-06 Flüssigkeitsbetätigter Betriebszylinder für einen Materialtransportträger

Country Status (1)

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EP (1) EP2385259A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040219294A1 (en) * 2000-04-12 2004-11-04 Balzars Aktiengesellschaft DLC coating system and process and apparatus for making coating system
WO2005012772A1 (en) * 2003-08-04 2005-02-10 Industries Mailhot Inc. Scraper ring assembly
US20060054438A1 (en) * 2004-09-13 2006-03-16 Smc Kabushiki Kaisha Guide-equipped cylinder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040219294A1 (en) * 2000-04-12 2004-11-04 Balzars Aktiengesellschaft DLC coating system and process and apparatus for making coating system
WO2005012772A1 (en) * 2003-08-04 2005-02-10 Industries Mailhot Inc. Scraper ring assembly
US20060054438A1 (en) * 2004-09-13 2006-03-16 Smc Kabushiki Kaisha Guide-equipped cylinder

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