DE3173248D1 - Pneumatically powered hydraulic pump - Google Patents

Pneumatically powered hydraulic pump

Info

Publication number
DE3173248D1
DE3173248D1 DE8181106100T DE3173248T DE3173248D1 DE 3173248 D1 DE3173248 D1 DE 3173248D1 DE 8181106100 T DE8181106100 T DE 8181106100T DE 3173248 T DE3173248 T DE 3173248T DE 3173248 D1 DE3173248 D1 DE 3173248D1
Authority
DE
Germany
Prior art keywords
valve spool
passage
hydraulic pump
face
pressurized air
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.)
Expired
Application number
DE8181106100T
Other languages
German (de)
Inventor
Rudolf Brunner
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.)
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Original Assignee
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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 Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG filed Critical Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Application granted granted Critical
Publication of DE3173248D1 publication Critical patent/DE3173248D1/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
    • F01L25/066—Arrangements with main and auxiliary valves, at least one of them being fluid-driven piston or piston-rod being used as auxiliary valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

1. Pneumatically actuated hydraulic pump (1) including a double acting actuator piston (9) adapted to be alternately pressurized via a switch valve (14) for actuating hydraulic pump elements (19), a valve spool (30) mounted in said switch valve (14) for displacement between two operative positions by the action of a selector control pressure derived from the pressure acting on said actuator piston (9) so as to connect in each of its operative positions a connecting passage (25 or 26) to a pressurized air supply passage, and another connecting passage (26 or 25) to a return passage (28 or 29), said return passages (28, 29) being disposed approximately in the same radial planes as said connecting passages (25, 26), as referred to the longitudinal axis of said valve spool, characterized in that a coaxial reduced-diameter auxiliary piston (41) is associated with each end face of said valve spool (30), each said auxiliary piston being sealedly slidable in the switch valve housing (15) and adapted to have its end facing away from said valve spool (30) acted upon by said selector control pressure, in that one of two annular chambers (39) is disposed between sealed guide means (38) for each auxiliary piston (41) and the respective end face (32) of said valve spool (30), the pressurized air being permitted to leak into said annular chambers, and in that a restricted venting channel (46) is formed between the end face (32) of said valve spool (30) closing the connection between the pressurized air supply passage (24) and the associated return passage (28, 29) and said return passage (28, 29).
DE8181106100T 1981-08-04 1981-08-04 Pneumatically powered hydraulic pump Expired DE3173248D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81106100A EP0071655B1 (en) 1981-08-04 1981-08-04 Pneumatically powered hydraulic pump

Publications (1)

Publication Number Publication Date
DE3173248D1 true DE3173248D1 (en) 1986-01-30

Family

ID=8187841

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8181106100T Expired DE3173248D1 (en) 1981-08-04 1981-08-04 Pneumatically powered hydraulic pump

Country Status (3)

Country Link
EP (1) EP0071655B1 (en)
AT (1) ATE17029T1 (en)
DE (1) DE3173248D1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR535062A (en) * 1920-05-27 1922-04-08 Steam machine
US3071118A (en) * 1960-05-03 1963-01-01 James K Wilden Actuator valve means
DE2021793A1 (en) * 1970-05-04 1971-11-25 Butterworth Hydraulic Dev Ltd Motor operated by means of fluid pressure
FR2263398A1 (en) * 1974-03-04 1975-10-03 Victor Products Ltd Hydraulic percussive tool - has changeover valve for driving moving parts to and fro

Also Published As

Publication number Publication date
ATE17029T1 (en) 1986-01-15
EP0071655A1 (en) 1983-02-16
EP0071655B1 (en) 1985-12-18

Similar Documents

Publication Publication Date Title
US4065094A (en) Hydraulic actuator
GB1467121A (en) Valve for the control of hydraulic fluid
US3670771A (en) Fluid operated booster valve
US3405606A (en) Control of double-acting pressure medium energized servo-motors
US3238972A (en) Pilot operated 3-way in-line valve
DE2967011D1 (en) Actuating device for a door
US3530895A (en) Automatic fluid pressure switching valve
DE3173248D1 (en) Pneumatically powered hydraulic pump
EP0428406B1 (en) Reciprocating actuator
US3522821A (en) Pilot actuated valve
US4825907A (en) Low restriction fluid control valve
US4351362A (en) Rotary valve
US4531540A (en) Servocontrolled pressure limiting valve
US4870891A (en) Pneumatically controlled air motor
GB2038417A (en) Fluid Control Valve and Ram Containing Same
GB1313860A (en) Jet pipe fluid control
DE3173448D1 (en) High-power electric circuit breaker with a hydraulically operated actuating device
US3672399A (en) Hydraulic or pneumatic controlled two stage slide valve
US3927690A (en) Pressure fluid valve having fully opened, fully closed and restricted flow positions
AU578147B2 (en) Hydraulic percusive machine
SU396511A1 (en) THREE-WAY VALVE
CA1092942A (en) Delaying control for hydraulic motors
ATE49266T1 (en) PIVOT DRIVE.
US2888951A (en) Actuator valve
SE8400676L (en) PNEUMATIC SERVICE VALVE

Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee