EP0520255A1 - Outil de travail hydraulique - Google Patents

Outil de travail hydraulique Download PDF

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Publication number
EP0520255A1
EP0520255A1 EP92109894A EP92109894A EP0520255A1 EP 0520255 A1 EP0520255 A1 EP 0520255A1 EP 92109894 A EP92109894 A EP 92109894A EP 92109894 A EP92109894 A EP 92109894A EP 0520255 A1 EP0520255 A1 EP 0520255A1
Authority
EP
European Patent Office
Prior art keywords
working
pump
piston
pressure fluid
pressure
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Withdrawn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
EP92109894A
Other languages
German (de)
English (en)
Inventor
Dieter Weiss
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0520255A1 publication Critical patent/EP0520255A1/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Withdrawn legal-status Critical Current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
    • F15B15/18—Combined units comprising both motor and pump

Definitions

  • the invention relates to a hydraulic working device according to the preamble of patent claim 1.
  • a hydraulic working device in the form of a hydraulic actuator in which a working cylinder with its working piston, a pump with its motor and a hydraulic fluid reservoir form a coherently assembled structural unit.
  • this hydraulic actuator is a complex unit.
  • the control piston with its piston rod is connected to its control with a complex line system, which although it is arranged in a housing, leads to a space-consuming construction.
  • the invention is based on the essential idea of combining the working cylinder, the pump and the storage container into an independent, coherently mountable structural unit, the space of the working cylinder containing the piston rod also serving as a storage container for the pressure fluid. This creates a compact unit that can be manufactured without excessive effort and easily installed in a space-saving manner. By eliminating hydraulic fluid and electrical lines, the device is more fail-safe.
  • a hydraulic working device essentially comprises a working cylinder 2 with a working piston 3, a pump 5 arranged in working cylinder 2, which is driven by an electric motor 6 via a conventional clutch 7, and a directional control valve 8, working cylinder 2
  • Directional control valve 8, pump 5 and motor 6 are firmly connected to one another and form a unit 1 that can be assembled together.
  • the motor 6 is flanged to a housing 9 containing the directional control valve 8 and the coupling 7, on the opposite side of which the pump 5 is fastened.
  • the working cylinder 2 is connected to the housing 9 by fastening rods 11 acting as tie rods.
  • the working piston 3 divides the cylinder cavity of the working cylinder 2 into two partial volumes.
  • a partial volume 12 which has a piston side A1 as the base, serves as Working space in which the hydraulic fluid presses on the piston side A1 of the working piston 3 and pushes the piston into an extended position.
  • a pipe 14 opening into the directional control valve 8 connects the partial volume 12 to the partial volume 13 via the directional control valve 8 and possibly via the pump 5.
  • the working cylinder 2 is fastened to a total of 4 fastening rods 11.
  • four further mounting bores 19 are provided in an end flange 18 of the working cylinder 3 for mounting the entire structural unit 1 at its place of use.
  • the directional control valve 8 has a circular cylindrical valve bore 20 and a valve piston 21 which is displaceable therein and which consists of two together via a valve piston rod 22 connected circular cylindrical piston sections 21a, 21b of different axial, but the same radial dimensions.
  • a spring 23 is fastened, which in turn is supported on the housing 9.
  • the valve piston rod 22 ends at a limit switch 24, which is also positioned outside the housing 9.
  • Four pressure fluid channels 26, 27, 28 and 29 each open into the valve bore 20 and can be connected to one another on account of the position of the valve piston 21 in the valve bore 20.
  • the hydraulic fluid channel 26 leads in a manner not shown in detail through a bore 26a to the pressure side, ie to the outlet of the pump 5.
  • the hydraulic fluid channel 27 leads via a bore 27a to the suction side, ie to the input of the pump 5.
  • two branches 27c and 27d open different position in the valve bore 20.
  • a further branch 27b leads into an inlet area 32 of an expandable reservoir 31 for the pressure fluid.
  • the hydraulic fluid channel 28 leads via a bore 28a directly into the partial volume 12 of the working cylinder 2 in a manner not shown in detail.
  • Two further branches 28b and 28c open into the valve bore 20 at different positions.
  • the hydraulic fluid channel 29, which also opens into the valve bore 20, leads via a bore 29a and the tube 14 to the partial volume 13.
  • the expandable memory 31 comprises the circular cylindrical inlet area 32, from which two circular cylindrical storage bores 33 and 34 each extend in opposite directions.
  • Storage pistons 35 and 36 are each slidably disposed in the storage bores 33, 34.
  • the accumulator pistons 35, 36 are biased in the direction of the inlet region 32 by the storage springs 37, 38. Under the pressure exerted by the pressure fluid in the inlet area 32 on the storage pistons 36, 37, these shift against the spring forces of the storage springs 37, 38 and enlarge the inlet area 32, which in this way expands with increasing pressure and absorbs pressure fluid.
  • the reservoir 31 can also have an enlarged inlet area 32 from the outset, ie it can be somewhat pre-filled with hydraulic fluid. It thus serves as a hydraulic fluid reservoir and in this way smaller hydraulic fluid losses in the structural unit 1 can be compensated for.
  • the valve piston 21 is moved in the valve bore 20 in one direction or the other depending on the liquid pressure.
  • the ratio of the force exerted on the valve piston 21 into the valve bore 20 to the force acting on the valve piston 21 out of the valve bore 20 is decisive for the direction of movement.
  • the force on the valve piston 21 into the valve bore 20 is caused by the spring 23, the force on the valve piston 21 out of the valve bore is exerted on account of the liquid pressure which exists in the volume which is closed on all sides and defined by the valve piston 21 in the valve bore 20 . In this way, a self-control of the directional valve 8 which is dependent on the liquid pressure is achieved.
  • control the directional control valve for example electromagnetically or by means of individual pressure limiting valves corresponding to the respective pressure.
  • valve piston 21 is in a position in which the pressure from the pressure side, i.e. hydraulic fluid duct 26 coming from the pump is connected via valve bore 20 to branch 28b of hydraulic fluid duct 28 leading to partial volume 12.
  • This causes a pressure to be exerted on the piston surface A1, whereby the working piston 3 in the working cylinder 2 is moved into an extended position and does work.
  • it is on the suction side, i.e. Hydraulic fluid channel 27 leading to the input of the pump is connected via its branch 27d and the valve bore 20 to the hydraulic fluid channel 29 leading to partial volume 13. Since the partial volume 13 forms the reservoir for the pressure fluid, the suction side of the pump is connected to the reservoir in this way. This means that hydraulic fluid is conveyed from the partial volume 13 into the partial volume 12 by the pump 5, generating pressure.
  • Fig. 4 shows the position of the directional control valve 8, which results when the working piston 3 is almost fully extended and, for example, presses on a rivet via a tool attached to the free end of its piston rod in order to form a rivet head there.
  • the pressure in the partial volume 12 continues to rise, since the pump continues to convey pressure fluid, which it sucks from the partial volume 13, into the partial volume 12.
  • this also increases the pressure in the volume of the valve bore 20, which the piston section 21a defines based on its position in the valve bore 20, into which the pressure fluid channel 26 and the branch 28a of the pressure fluid channel 28 open.
  • valve piston 21 shows a position of the valve piston 21, in which the pressure side of the pump is connected to the partial volume 12 of the working cylinder 2 via the pressure fluid channel 26 and the branches 28a, 28b of the pressure fluid channel 28.
  • the volume lying between the valve piston sections 21a and 21b in the valve bore 20 is connected via the branch 28c of the pressure fluid channel 28.
  • This volume is in turn via the pressure fluid channel 29 and its branch 29a with that as a reservoir for the pressure fluid serving partial volume 13 of the working cylinder 2 connected.
  • the two partial volumes 12, 13 of the working cylinder 2 are connected to one another, which triggers the pushing back of the piston by the two return springs 15 and 16, which are located in the partial volume 13.
  • the pump 5 is switched off or throttled.
  • the position of the valve piston 21 shown in FIG. 5, in which the two partial volumes 12, 13 are connected to one another without the suction side of the pump being connected to the partial volume 13, can be used so that when the pump 5 is switched on, the working piston 3 extends faster than if the suction side of the pump were connected to the partial volume 13 via the pressure fluid channel 27, the valve bore 20 and the pressure fluid channel 29. 5 can therefore be used to move the working piston in rapid traverse before reaching the position of the directional control valve 8 shown in FIG. 3, no force being exerted by the working piston 3. In the above example of forming a rivet head, this rapid traverse lasts until the tool attached to the piston rod of the working piston hits the rivet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Multiple-Way Valves (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP92109894A 1991-06-22 1992-06-12 Outil de travail hydraulique Withdrawn EP0520255A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4120682 1991-06-22
DE19914120682 DE4120682C1 (fr) 1991-06-22 1991-06-22

Publications (1)

Publication Number Publication Date
EP0520255A1 true EP0520255A1 (fr) 1992-12-30

Family

ID=6434544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109894A Withdrawn EP0520255A1 (fr) 1991-06-22 1992-06-12 Outil de travail hydraulique

Country Status (3)

Country Link
EP (1) EP0520255A1 (fr)
JP (1) JPH05280506A (fr)
DE (1) DE4120682C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277354A (en) * 1993-03-15 1994-10-26 Scanlan Thomas Robert Hydraulic piston and cylinder assembly
CN105508343A (zh) * 2015-12-22 2016-04-20 芜湖恒坤汽车部件有限公司 减震转向油缸

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111677702B (zh) * 2020-06-29 2024-05-03 广西玉柴机器股份有限公司 一种重型油缸行程可调系统及安全可调控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1522589A (fr) * 1966-03-30 1968-04-26 Itt Appareil de commande électro-hydraulique
US3828556A (en) * 1973-01-26 1974-08-13 Johnson Service Co Hydraulic actuator
CH660208A5 (en) * 1982-10-25 1987-03-31 Elektrowatt Ag Electrohydraulic actuator for continuous control
EP0237740A1 (fr) * 1986-03-06 1987-09-23 Detlef Köppen Unité cylindre-pompe à fluide
DE3635694A1 (de) * 1986-10-21 1988-05-05 Samson Ag Dichtungsanordnung fuer eine antriebsstange sowie elektrohydraulischer stellantrieb mit einer solchen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2218059A1 (de) * 1972-04-14 1973-10-31 Ver Flugtechnische Werke Hydraulischer stellantrieb

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1522589A (fr) * 1966-03-30 1968-04-26 Itt Appareil de commande électro-hydraulique
US3828556A (en) * 1973-01-26 1974-08-13 Johnson Service Co Hydraulic actuator
CH660208A5 (en) * 1982-10-25 1987-03-31 Elektrowatt Ag Electrohydraulic actuator for continuous control
EP0237740A1 (fr) * 1986-03-06 1987-09-23 Detlef Köppen Unité cylindre-pompe à fluide
DE3635694A1 (de) * 1986-10-21 1988-05-05 Samson Ag Dichtungsanordnung fuer eine antriebsstange sowie elektrohydraulischer stellantrieb mit einer solchen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DESIGN ENGINEERING. Dezember 1990, LONDON GB Seite 21; 'integral linear hydraulic actuator provides more thrust from a smaller unit' *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277354A (en) * 1993-03-15 1994-10-26 Scanlan Thomas Robert Hydraulic piston and cylinder assembly
CN105508343A (zh) * 2015-12-22 2016-04-20 芜湖恒坤汽车部件有限公司 减震转向油缸

Also Published As

Publication number Publication date
JPH05280506A (ja) 1993-10-26
DE4120682C1 (fr) 1992-11-05

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