EP2083177A2 - Cylindre hydraulique avec une tige dotée d'un dispositif de sécurité - Google Patents

Cylindre hydraulique avec une tige dotée d'un dispositif de sécurité Download PDF

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Publication number
EP2083177A2
EP2083177A2 EP09000389A EP09000389A EP2083177A2 EP 2083177 A2 EP2083177 A2 EP 2083177A2 EP 09000389 A EP09000389 A EP 09000389A EP 09000389 A EP09000389 A EP 09000389A EP 2083177 A2 EP2083177 A2 EP 2083177A2
Authority
EP
European Patent Office
Prior art keywords
rod
rod body
rod head
head
joint
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Withdrawn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
EP09000389A
Other languages
German (de)
English (en)
Inventor
Jin Woo Lee
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.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
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 Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Publication of EP2083177A2 publication Critical patent/EP2083177A2/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Withdrawn legal-status Critical Current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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • 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

Definitions

  • the present invention relates to a hydraulic cylinder having a rod safety device, which can improve the safety of a hydraulic cylinder by adding a joint connection means to a bonding part in which a rod head and a rod body of the hydraulic cylinder are joint-connected by welding.
  • the present invention relates to a hydraulic cylinder having a rod safety device, in which a screw engagement part (e.g. a screw is used) is formed in center parts of mutual contact surfaces of a rod head and a rod body of the hydraulic cylinder in a shaft direction, and an outer surface of a joint connection part of the rod head and the rod body is welded, so that a free falling of an arm and a bucket is prevented by a screw engagement part when a welding part is broken to protect a cab and an operator.
  • a screw engagement part e.g. a screw is used
  • a general hydraulic cylinder includes a tube 2 accommodating a cylinder rod 1 that slides in a set stroke range; a cover 3 connected by weld joint to one end part of the tube 2 (corresponding to a side of a rod head 1a); an end cover 4 connected by weld joint to the other end part of the tube 3 (corresponding to a side of a piston 5); and a piston 5 fastened to one end part of the cylinder rod 1 to reciprocate along an inner periphery of the tube 2.
  • the cylinder rod 1 receives a complex load, such as a tensile force, a compression force, and a bending load in a shaft direction.
  • a complex load such as a tensile force, a compression force, and a bending load in a shaft direction.
  • a relatively large force acts on the outer surface (i.e. an edge part) of the weld joint part 13 of the rod body 1b rather than the center of the weld joint part 13 in the shaft direction.
  • an owner of the equipment may mount a working device optionally remodeled to cope with diverse working environments (so called "special attachments") on a bucket 7 and so on.
  • the present invention has been made to solve the above-mentioned problems occurring in the prior art while advantages achieved by the prior art are maintained intact.
  • One object of the present invention is to provide a hydraulic cylinder having a rod safety device, in which a screw engagement part is formed in center parts of mutual contact surfaces of a rod head and a rod body of the hydraulic cylinder in a shaft direction, and an outer surface of a joint connection part of the rod head and the rod body is welded, so that a free falling of an arm and a bucket is prevented by fastening members when a welding part is broken to prevent the damage of a cab and to protect an operator from an accident.
  • Another object of the present invention is to provide a hydraulic cylinder having a rod safety device, which can improve the reliability of equipment by preventing a free falling of an arm and a bucket when a welding part of a cylinder rod is broken due to welding defects and so on, even if an owner of the equipment optionally remodels a working device to cope with divers working environments.
  • a hydraulic cylinder having a rod safety device which includes a cylinder rod sliding within a set stroke range in a tube and composed of a rod head and a rod body joint-connected to the rod head; a cover connected by weld joint to one end part of the tube; an end cover connected by weld joint to the other end part of the tube; a piston fastened to one end part of the cylinder rod to reciprocate along an inner periphery of the tube; and a connection means composed of a screw engagement part formed in center parts of mutual contact surfaces of the rod head and the rod body in a shaft direction to joint-connect the rod head and the rod body by screw-engaging the rod head and the rod body, and a weld joint part joint-connecting the rod head and the rod body by welding outer peripheries of the contact surfaces of the rod head and the rod body.
  • the screw engagement part may include screw holes respectively formed in the center parts of the mutual contact surfaces of the rod head and the rod body in the shaft direction, and a connection bolt engaged into the screw holes to screw-engage the rod head and the rod body.
  • the screw engagement part may include a screw hole formed in one of the center parts of the contact surfaces of the rod head and the rod body, and a connection bolt fixed by welding to the other of the center parts of the contact surfaces of the rod head and the rod body to correspond to the screw hole.
  • a hydraulic cylinder having a rod safety device includes a cylinder rod 1 sliding within a set stroke range in a tube 2 and composed of a rod head 1a and a rod body 1b joint-connected to the rod head 1a; a cover 3 connected by weld joint to one end part of the tube 2; an end cover 4 connected by weld joint to the other end part of the tube 2; a piston 5 fastened to one end part of the cylinder rod 1 to reciprocate along an inner periphery of the tube 2; and a connection means composed of a screw engagement part 10 formed in center parts of mutual contact surfaces of the rod head 1a and the rod body 1b in a shaft direction to joint-connect the rod head 1a and the rod body 1b by screw-engaging the rod head 1a and the rod body 1b, and a weld joint part 13 joint-connecting the rod head 1a and the rod body 1b by welding outer peripheries of the contact surfaces of the
  • the screw engagement part 10 includes screw holes 11 respectively formed in the center parts of the mutual contact surfaces of the rod head 1a and the rod body 1b in the shaft direction, and a connection bolt 12 engaged into the screw holes 11 to screw-engage the rod head 1a and the rod body 1b.
  • the hydraulic cylinder having a rod safety device except for the screw engagement part 10 including the screw holes 11 respectively formed in the center parts of the mutual contact surfaces of the rod head 1a and the rod body 1b in the shaft direction, and the connection bolt 12 engaged into the screw holes 11 to screw-engage the rod head 1a and the rod body 1b, is substantially the same as the conventional hydraulic cylinder as illustrated in FIGS. 1 and 2 , and thus the detailed description thereof will be omitted.
  • the same drawing reference numerals are used for the same elements across various figures.
  • the rod head 1a and the rod body 1b are joint-connected by screw-engaging the connection bolt 12 into the screw holes 11 respectively formed in the center parts of the mutual contact surfaces of the rod head 1a and rod body 1b of the cylinder rod 1.
  • the outer surfaces of the contact surfaces of the rod head 1a and the rod body 1b, which are in close contact with each other and are joint-connected by the connection bolt 12, are fixed together by welding.
  • the rod head 1a and the rod body 1b are firstly joint-connected by the connection bolt 12 that is screw-engaged with the center parts of the mutual contact surfaces of the rod head and the rod body in a shaft direction, and are secondly joint-connected by the weld joint part 13 that fixes by welding the outer surfaces of the contact surfaces of the rod head 1a and the rod body 1b to each other.
  • the weld joint part 13 may be broken or damaged due to welding defects and so on.
  • the rod head 1a and the rod body 1b can be kept in a joint connection state by the connection bolt 12 that is screw-engaged with the inner center portion of the weld joint part 13 in a shaft direction.
  • the screw engagement part 10 which is formed in the center parts of the mutual contact surfaces of the rod head 1a and the rod body 1b in a shaft direction to joint-connect the rod head 1a and the rod body 1b through screw-engagement, may a screw hole 11 formed in one of the center parts of the contact surfaces of the rod head 1a and the rod body 1b (e.g. formed in the rod head 1a), and a connection bolt 12 fixed by welding to the other of the center parts of the contact surfaces of the rod head 1a and the rod body 1b to correspond to the screw hole 11.
  • the construction except for the screw engagement part 10 composed of the screw hole 11 formed in the center of the contact surface of the rod head 1a and the connection bolt 12 fixed by welding to the center of the contact surface of the rod body 1a, is substantially the same as that as illustrated in FIGS. 3 and 4A , the detailed description thereof will be omitted.
  • the same drawing reference numerals are used for the same elements across various figures.
  • the hydraulic cylinder having a rod safety device has the following advantages.
  • the screw engagement part is formed in the center parts of the mutual contact surfaces of the rod head and the rod body of the hydraulic cylinder in the shaft direction (i.e. in a direction of extension and compression of the cylinder rod), and the outer surface of the joint connection part of the rod head and the rod body is welded, a free falling of the arm and the bucket is prevented by the fastening members when the welding part is broken, so that the cab is prevented from being damaged, and the operator is protected from an accident.
  • the reliability of the equipment is improved by preventing a free falling of the arm and the bucket when the welding part of the cylinder rod is broken due to welding defects and so on.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
EP09000389A 2008-01-23 2009-01-14 Cylindre hydraulique avec une tige dotée d'un dispositif de sécurité Withdrawn EP2083177A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080007192A KR20090081223A (ko) 2008-01-23 2008-01-23 로드의 안전장치가 구비된 유압실린더

Publications (1)

Publication Number Publication Date
EP2083177A2 true EP2083177A2 (fr) 2009-07-29

Family

ID=40598475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09000389A Withdrawn EP2083177A2 (fr) 2008-01-23 2009-01-14 Cylindre hydraulique avec une tige dotée d'un dispositif de sécurité

Country Status (5)

Country Link
US (1) US20090185887A1 (fr)
EP (1) EP2083177A2 (fr)
JP (1) JP2009174718A (fr)
KR (1) KR20090081223A (fr)
CN (1) CN101493107A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6521050B2 (ja) * 2015-02-16 2019-05-29 株式会社タダノ 液圧シリンダ、シリンダ装置、作業車両、及び液圧シリンダ製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599082A (en) * 1947-10-03 1952-06-03 Neal H Anderson Oil Tool Co Slush pump piston and piston rod
US4741254A (en) * 1986-06-12 1988-05-03 Taylor Julian S Pump plunger

Also Published As

Publication number Publication date
JP2009174718A (ja) 2009-08-06
US20090185887A1 (en) 2009-07-23
CN101493107A (zh) 2009-07-29
KR20090081223A (ko) 2009-07-28

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