WO2024104517A1 - Cylindre de travail - Google Patents

Cylindre de travail Download PDF

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Publication number
WO2024104517A1
WO2024104517A1 PCT/DE2023/000118 DE2023000118W WO2024104517A1 WO 2024104517 A1 WO2024104517 A1 WO 2024104517A1 DE 2023000118 W DE2023000118 W DE 2023000118W WO 2024104517 A1 WO2024104517 A1 WO 2024104517A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod
closure part
cylinder
joint head
section
Prior art date
Application number
PCT/DE2023/000118
Other languages
German (de)
English (en)
Inventor
Josef Bueter
Original Assignee
Bümach Engineering International B. V.
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 Bümach Engineering International B. V. filed Critical Bümach Engineering International B. V.
Publication of WO2024104517A1 publication Critical patent/WO2024104517A1/fr

Links

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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps
    • 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
    • F15B15/1457—Piston rods

Definitions

  • the invention relates to a working cylinder with coupling sections for an articulated coupling with a device to be actuated.
  • Rod ends are manufactured in particular as burnt parts or forged parts and accommodate a spherical plain bearing in a joint eye, which can have different degrees of freedom in order to be able to couple the working cylinder free from bending stresses.
  • the joint head In order to couple the joint to a bottom closure part, it is known from the state of the art to couple the joint head by means of MAG welding.
  • the disadvantage of this is that not only the size but also the shape of the joint heads must be determined depending on the working cylinder to be coupled, which makes their provision more expensive.
  • the joint head is provided with a straight outer contour section that is welded flat onto the cover surface of the bottom closure part.
  • the MAG weld seam is generously dimensioned to absorb the high forces.
  • the material deposit in the throat as a weld bead which can be up to 15 mm, requires a corresponding allowance in relation to the distance of the outer contour section to the so-called joint eye, in order to ensure sufficient free movement space around the joint eye.
  • temperature-sensitive components such as spherical plain bearings in particular, can only be mounted after welding or a material allowance of at least 30% of the mass must be provided on the rod end in order to be able to dissipate the heat sufficiently.
  • the object of the invention is to provide a working cylinder that can be coupled by means of a joint head, which requires little installation space and can be manufactured with a reduced use of materials and time.
  • the working cylinder according to the invention has a cylinder and a piston unit as basic elements and is characterized by a specially designed coupling section with a joint head.
  • the cylinder of the working cylinder according to the invention has, in a manner known per se, a cylinder tube, a first closure part and a second closure part.
  • the cylinder tube has two opposite cylinder tube ends.
  • the two opposite cylinder tube ends are referred to below as the first cylinder tube end and the second cylinder tube end and collectively as the cylinder tube ends.
  • the first closure part is arranged at the first cylinder tube end and the second closure part is arranged at the second cylinder tube end.
  • the first closure part and the second closure part are referred to collectively as the closure parts below.
  • the first closure part is designed as a guide closure part and the second closure part as a base closure part.
  • the cylinder tube and the closure parts arranged on it form a cylinder interior.
  • the two closure parts are designed in such a way that they are connected to the respective cylinder tube ends in a pressure-tight manner.
  • the two closure parts are preferably laser-welded to the cylinder tube along the circumferential common contact surface.
  • the piston unit forms at least one working chamber in the cylinder interior.
  • the piston unit is preferably designed as an assembly of piston and piston rod, with the piston rod sliding through the guide closure part.
  • the piston unit can also be a plunger piston or a piston unit of a synchronous cylinder, for example.
  • the working cylinder according to the invention can also be other types, in particular a differential working cylinder or a pull cylinder. It is preferably a hydraulic cylinder, but is not limited to this.
  • the piston unit has an outer end section.
  • the outer end section is the distal head section of the piston unit, preferably the piston rod, which is located outside the cylinder interior. In the case of a plunger cylinder, this is the distal head of the plunger piston.
  • the working cylinder according to the invention is also characterized by a coupling section designed in a special way.
  • the coupling section in the sense of the present invention is understood to be the part of the working cylinder which is connected to a device to be actuated, for example an excavator arm, and via which the working cylinder provided forces are transmitted or the forces emanating from the device to be actuated are absorbed.
  • the device to be actuated itself is not part of the working cylinder according to the invention. It merely represents the functional context of the working cylinder according to the invention.
  • two opposing coupling sections are arranged on the working cylinder, with at least one coupling section being designed according to the invention.
  • the working cylinder according to the first independent claim has, according to the invention, a bottom-side joint head.
  • the bottom-side joint head has a bottom-side joint head body and a joint bearing arranged therein.
  • the joint bearing is used for a friction-optimized and torque-free coupling of the working cylinder with a device to be actuated by means of a coupling bolt in at least one rotational degree of freedom.
  • the base-side joint head base body is designed as a ring body.
  • a ring body is understood to be a rotationally symmetrical component that, in contrast to the flame-cut or forged parts known from the prior art, can advantageously be provided with high precision by simple turning.
  • the ring body preferably has an essentially hollow-cylindrical basic shape.
  • the base of the joint head body has a concentric mounting hole in which the spherical plain bearing is accommodated.
  • the base of the rod end body has an outer ring body surface. This extends circumferentially in a radial direction on the outer surface of the ring body.
  • the bottom closure part of the working cylinder has a bottom closure part mold section designed in a special way.
  • the bottom closure part mold section is designed as a monolithic section of the bottom closure part and is provided in particular by milling.
  • the bottom closure part mold section rises from the outer bottom closure part cover surface above the plane spanned by it in the axial distal direction.
  • the bottom closure part mold section has a radius-accompanying web-shaped basic shape.
  • a web-shaped basic shape is understood to be an essentially prismatic body whose base and cover surfaces are arranged transversely to the bottom closure part cover surface.
  • a radius-accompanying basic shape is understood to mean that the bottom closure part mold section has a concave indentation in its essentially prismatic basic shape. There is a concavely curved surface on the concave indentation, which geometrically forms a section of a cylinder jacket surface and is referred to below as the bottom-side radial inner jacket surface.
  • the concave recess forms a receiving section.
  • the receiving section is shaped in such a way that it has a radial inner surface that corresponds to the radial outer surface of the ring body.
  • the shape of a cylindrical surface section of the receiving section advantageously enables the joint head base body to be received in a flat manner.
  • the section of the radial outer surface of the ring body that lies flat against the radial inner surface of the concave receiving section of the bottom closure part mold section is also referred to below as the outer surface of the ring body.
  • This surface support advantageously enables a high transmission of pressure forces, as is particularly the case when the working cylinder is extended.
  • the corresponding surfaces also provide a partial positive locking of the position between the joint head base body and the base closure part, which counteracts twisting and tilting of the joint head base body.
  • the base-side rod end body is welded to a radial ring body outer surface with the base closure part on the radial inner surface using a base-side laser ring segment weld.
  • the full-surface welding of the rod end body and the base closure part on the corresponding surfaces creates a reliable, material-locking connection between the two parts and enables the transmission of high tensile forces, such as those that occur in particular when the working cylinder is in the retracted operating state.
  • the bottom closure part can also advantageously be provided as a turned part in a particularly simple and cost-effective manner. Due to its simple geometry, the bottom closure part mold section can also be manufactured using conventional milling machines during the manufacture of the bottom closure part using the same technology as the bottom closure part without the need for an additional processing station. This results in a great advantage in terms of the manufacturing effort and the associated manufacturing costs.
  • the low linear energy of the laser welding enables small heat-affected zones, so that thermal damage or deformation of the bottom closure part or the joint head base body can be avoided.
  • laser welding according to the invention is also possible with sensitive components that have already been introduced beforehand, such as polymer seals or the like.
  • the laser welding of the rod end base body to the base closure part can also be carried out with an already assembled spherical bearing.
  • the working cylinder is characterized in that a bottom-side pressure medium connection bore is arranged at least in sections in the bottom closure part mold section.
  • the installation space provided by the bottom closure part mold section is also advantageously used for the arrangement of the pressure medium connection bore.
  • the installation length of the working cylinder can be reduced while maintaining the same stroke length.
  • a functional integration is thus created by means of the bottom closure part mold section in that the bottom closure part mold section firstly accommodates the joint head in a force-transmitting manner and secondly creates an installation space for accommodating the pressure medium connection bore axially distally beyond the bottom closure cover surface.
  • the working cylinder is characterized in that the bottom-side pressure medium connection bore at least partially distally crosses a transverse plane spanned by a vertex line of the receiving section to a longitudinal axis.
  • the apex line of the receiving section is the point at which the bottom closure part mold section has the smallest elevation above the bottom closure part cover surface and, in an assembled state, the joint head base body extends the furthest in the proximal direction.
  • the pressure medium connection can therefore be arranged in the bottom closure part in an area with the greatest material coverage and at the same time very far distally. This achieves maximum bending stiffness of the connection. This advantageously enables a particularly strong reduction in the overall length without affecting the stroke length.
  • the working cylinder is characterized in that it has a rod-side joint head. This forms the rod-side articulated coupling of the working cylinder to a device to be actuated.
  • the rod-side joint head also has a joint head base body - hereinafter referred to as the rod-side joint head base body - and a spherical bearing - hereinafter referred to as the rod-side spherical bearing.
  • the descriptions of the base-side joint head and its arrangement on the working cylinder therefore also apply accordingly to the rod-side joint head, unless special features arise from the following description sections.
  • the rod-side joint head base body is also designed as a ring body. It has a concentric receiving bore on the rod side.
  • the rod-side spherical plain bearing is accommodated in this.
  • the rod-side joint head base body also has an essentially hollow-cylindrical basic shape.
  • the joint head base body also has a radial ring body outer surface on the rod side.
  • the piston unit has a rod-side molded section at the outer end section.
  • the rod-side mold section corresponds to the bottom closure part mold section, taking into account the rod-side special features.
  • the rod-side mold section is machined from the cylindrical basic shape of the outer end section of the piston unit, preferably by milling. This is then designed as a monolithic section of the piston unit. Accordingly, the rod-side mold section rises axially distally above the cylindrical section of the piston unit and has a web-shaped and radius-accompanying basic shape.
  • the rod-side mold section has a concave recess that forms a rod-side receiving section.
  • the rod-side receiving section has a radial inner surface that corresponds to the radial ring body outer surface.
  • the rod-side shaped section forms an exact receiving counter-shape in diameter and preferably also in width to the outer surface of the rod head base body.
  • the rod-side receiving section is preferably limited in length by the outer diameter of the piston rod.
  • the latter is welded to a rod-side radial ring body outer shell partial surface of the rod-side radial ring body outer shell surface with the piston unit on the rod-side radial inner shell surface by means of a rod-side laser ring segment weld seam.
  • the working cylinder with a base-side and rod-side joint head is characterized in that the base-side joint head base body and the rod-side joint head base body are designed as structurally identical components.
  • the production of the rod ends can be rationalized, which is advantageous.
  • the invention offers the advantage that the rod ends can be manufactured in graduated sizes without specific manufacturer specifications, and that for adaptation only the base closure part mold section or the rod-side mold section has to be milled according to the respective size of the rod ends available in large quantities.
  • the working cylinder is characterized in that the base-side laser ring segment weld seam or the rod-side laser ring segment weld seam is designed as a double-sided weld seam.
  • a further aspect of the invention relates, according to the independent claim, to a working cylinder which has a joint head according to the invention only on the rod side.
  • the basic structure of the working cylinder in relation to the cylinder, the cylinder tube, the closure parts and the piston unit corresponds to the working cylinder according to the main claim, so that the description contents there also apply accordingly to the working cylinder according to the independent claim described here. Furthermore, with regard to the rod- side joint head and the formation of the rod-side shaped section at the outer end section of the piston unit, the description contents of the dependent claim for the additional rod-side joint head apply accordingly.
  • FIG. 1 schematic sectional view of the working cylinder
  • Fig. 2 schematic representation of the piston rod as a side view
  • FIG. 3 schematic representation of the piston rod side mold section with the ring body
  • FIG. 4 schematic representation of the working cylinder as a side view
  • FIG. 5 schematic sectional view of the bottom section of the working cylinder explained in more detail.
  • Fig. 1 shows a schematic sectional view of an embodiment of the working cylinder.
  • This consists in its basic components of a cylinder 11 and a piston unit 12.
  • the cylinder tube 13 is provided with a guide closure part 14 and Bottom closure part 15 is closed and thus forms a cylinder interior 16.
  • the working cylinder has a joint head 20, 30 designed according to the invention on both the base side and the rod side.
  • the base side joint head 20 and also the rod side joint head 30 are each designed as an annular body and specifically as a rotating part.
  • the bottom-side joint head 20 has the bottom-side joint head base body 21 and the bottom-side joint bearing 22 pressed into its bottom-side receiving bore 23.
  • the bottom-side joint head base body 21 has a bottom-side radial annular body outer surface 24.
  • the base closure part 15 has a specially designed base closure part mold section 15.1 for receiving the base-side joint head 20, wherein in Fig. 1 the sectional plane of the sectional view of the base closure part runs lengthways through the base closure part mold section 15.1.
  • the web-shaped base closure part mold section 15.1 - as can be seen better in Fig. 4 - has a circular, concave base-side receiving section 15.3 that accompanies the radius of the joint head base body 21 on its radial annular body outer surface 24.
  • the receiving section 15.3 forms a base-side radial inner surface 15.4, the radius of which corresponds to the base-side annular body outer surface 24.
  • the part of the bottom-side ring body outer surface 24 that is congruent with the bottom-side radial inner surface 15.4 is the bottom-side radial ring body outer surface partial surface 25.
  • These two surfaces 15.4, 25 are fully bonded by means of the bottom-side laser ring segment weld seam 26 introduced on both sides.
  • the bonded welding in conjunction with the partial form fit due to the corresponding shape of the two surfaces 15.4, 25 enables reliable pre-positioning before welding and a particularly stable coupling after welding, which is advantageous in terms of manufacturing technology.
  • the bottom-side pressure medium connection bore 15.5 is arranged in sections in the bottom closure part mold section 15.1.
  • bottom closure part mold section 15.1 This is advantageously accommodated in the bottom closure part mold section 15.1 in such a way that it dips into a transverse plane 15.7 spanned by the proximal apex 15.6. Due to the bottom closure part mold section 15.1 being distally tapered on both sides of the cylindrical diameter of the bottom closure part 15, there is sufficient space in the remaining web for the bottom-side pressure medium connection bore 15.5. The axial extension between the piston in its bottom-side end position on the bottom closure part 15 and the articulation point of the bottom-side joint head 20 can therefore be significantly reduced, which represents a decisive advantage due to the reduced necessary installation space length of the working cylinder.
  • the rod-side joint head 30 serves to link the piston unit 12 to a device to be actuated. Similar to the base-side joint head 20, a rod-side spherical bearing 32 is also integrated into the rod-side joint head 30. This is received in the rod-side receiving bore 33 of the rod-side joint head base body 31. To receive the rod-side joint head 30 on the outer end section 12.5 of the piston unit 12, the piston rod has a rod-side receiving section 12.3. With its concave shape, this forms the counterpart section to the rod-side ring body outer shell partial surface 35, which is a section of the rod-side ring body outer shell surface 34.
  • the rod-side shaped section 12.1 is distally offset in the width of the rod-side spherical bearing 32. This is where the full cross-section end 12.2 is located.
  • Fig. 2 shows a schematic representation of the piston rod of the piston unit 12.
  • This has the rod-side mold section 12.1 on its outer end section 12.5, which is designed to accommodate the rod-side joint head 30.
  • the rod-side mold section 12.1 is made from the cylindrical diameter by a machining process, in particular by milling. the piston rod.
  • two recess areas are created distally and parallel on both sides. This creates a full cross-section end 12.2 of the piston rod.
  • the rod-side receiving section 12.3 is introduced at the rod-side end of the piston rod perpendicular to the main longitudinal axis 17. This describes a circular section with the same diameter as the base-side joint head body 21.
  • Fig. 3 shows a schematic exploded view of the piston rod and the rod-side joint head 30.
  • the rod-side joint head 30 is also shown slightly tilted for better illustration.
  • the rod-side joint bearing 32 - not shown in Fig. 3 for the sake of simplicity - is accommodated in the rod-side joint head base body 31.
  • the piston rod has a rod-side shaped section 12.1 at one end. This is provided by milling the area. A shoulder is created which results from the full cross-section end 12.2 due to the material removal through machining.
  • a prismatic section is first obtained from the cylindrical rod end by symmetrical milling on both sides as a preliminary stage of the rod-side shaped section 12.1.
  • a concave rod-side receiving section 12.3 corresponding to the cylindrical outer shape of the rod-side joint head 30 has been incorporated. This forms a rod-side radial inner surface 12.4 in the axial direction. This serves to accommodate the rod-side joint head 30, the cylindrical outer shape of which has a rod-side radial annular body outer surface 34.
  • a laser ring segment weld seam 36 is placed axially to the rod-side mounting hole 33 between the rod-side radial ring body outer surface partial surface 35 and the radial inner surface 12.4. so that it connects these surfaces 12.4, 35.
  • the piston unit 12 and the rod-side joint head 30 are thus reliably coupled.
  • Fig. 4 shows, as a schematic representation of the working cylinder, in particular the positional relationships of the base-side joint head 30 and the base closure part 15.
  • the base closure part 15 also has an originally cylindrical shape.
  • the base closure part mold section 15.1 is milled out through two recesses that extend distally to the main longitudinal axis 17 of the cylinder.
  • the web width of this corresponds to the axial extent of the base-side joint head base body 21. It is therefore advantageously wide enough so that the base-side pressure medium connection bore 15.5 can also be arranged here. This creates a decisive space advantage, as the working cylinder can be built shorter overall.
  • the cylinder tube 13 and base closure part 15 are also laser-welded in the exemplary embodiment.
  • Fig. 5 additionally shows, in a sectional view of the base-side section of the working cylinder, the base closure part mold section 15.1 without the base-side joint head 20, whereby the dashed line indicates the boundary to the rest of the base closure part 15, which is not visible due to the cutting plane, as well as the plane of the base closure part cover surface 15.2.
  • the base closure part mold section 15.1 has the base-side receiving section 15.3.
  • the receiving section 15.3 forms the base-side radial inner surface 15.4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)

Abstract

L'invention concerne un cylindre de travail comprenant un cylindre (11) et une unité piston (12) et caractérisé : en ce que le cylindre (11) présente une tête de joint articulée côté inférieur (20) qui présente un corps principal de tête de joint côté inférieur (21) et un palier de joint côté inférieur (22) ; en ce que le corps principal de tête de joint côté inférieur (21) se présente sous la forme d'un corps annulaire et comprend un alésage de réception concentrique côté inférieur (23), dans lequel le palier de joint côté inférieur (22) est reçu, et comprend également une surface latérale extérieure de corps annulaire radial côté inférieur (24) ; en ce que la partie de fermeture inférieure (15) comporte une partie en forme de partie de fermeture inférieure (15.1) qui est formée en tant que partie monolithique de la partie de fermeture inférieure (15) et qui s'élève axialement au-dessus d'une surface de recouvrement de partie de fermeture inférieure extérieure (15.2) et qui comprend une forme de base de type saillie qui suit un rayon ; en ce que la partie en forme de partie de fermeture inférieure (15.1) présente une indentation concave qui forme une partie de réception côté inférieur (15.3) qui comprend une surface latérale intérieure radiale côté inférieur (15.4) correspondant à la surface latérale extérieure de corps annulaire radial côté inférieur (24) ; et en ce que le corps principal de tête de joint côté inférieur (21) est soudé, au niveau d'une surface partielle latérale extérieure de corps annulaire radial côté inférieur (25), à la partie de fermeture inférieure (15), au niveau de la surface latérale intérieure radiale côté inférieur (15.4), au moyen d'un joint de soudure laser en forme de segment annulaire côté inférieur (26).
PCT/DE2023/000118 2022-11-14 2023-09-28 Cylindre de travail WO2024104517A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202022002445.2 2022-11-14
DE202022002445.2U DE202022002445U1 (de) 2022-11-14 2022-11-14 Arbeitszylinder

Publications (1)

Publication Number Publication Date
WO2024104517A1 true WO2024104517A1 (fr) 2024-05-23

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ID=88598878

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2023/000118 WO2024104517A1 (fr) 2022-11-14 2023-09-28 Cylindre de travail

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Country Link
DE (1) DE202022002445U1 (fr)
WO (1) WO2024104517A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105090160A (zh) * 2015-09-30 2015-11-25 柳州双吉机械有限公司 双作用活塞式液压缸
CN105422545A (zh) * 2015-12-28 2016-03-23 湖州环丰机械有限公司 上变幅油缸
EP3040587A1 (fr) * 2013-08-26 2016-07-06 KYB-YS Co., Ltd. Procédé de fabrication d'une tige de piston

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202019004569U1 (de) 2019-11-08 2021-02-10 Bümach Engineering International B.V. Arbeitszylinder
DE102019007754A1 (de) 2019-11-08 2021-05-12 Bümach Engineering International B.V. Arbeitszylinder und Verfahren zu dessen Herstellung
DE112020007704A5 (de) 2020-10-19 2023-08-03 Bümach Engineering International B.V. Endlagengedämpfter Arbeitszylinder und Dämpfungskolbenring
DE102021001107A1 (de) 2021-03-02 2022-09-08 Bümach Engineering International B.V. Arbeitszylinder und Verfahren zu dessen Herstellung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3040587A1 (fr) * 2013-08-26 2016-07-06 KYB-YS Co., Ltd. Procédé de fabrication d'une tige de piston
CN105090160A (zh) * 2015-09-30 2015-11-25 柳州双吉机械有限公司 双作用活塞式液压缸
CN105422545A (zh) * 2015-12-28 2016-03-23 湖州环丰机械有限公司 上变幅油缸

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