ATE17029T1 - PNEUMATIC ACTUATED HYDRAULIC PUMP. - Google Patents

PNEUMATIC ACTUATED HYDRAULIC PUMP.

Info

Publication number
ATE17029T1
ATE17029T1 AT81106100T AT81106100T ATE17029T1 AT E17029 T1 ATE17029 T1 AT E17029T1 AT 81106100 T AT81106100 T AT 81106100T AT 81106100 T AT81106100 T AT 81106100T AT E17029 T1 ATE17029 T1 AT E17029T1
Authority
AT
Austria
Prior art keywords
valve spool
passage
hydraulic pump
face
pressurized air
Prior art date
Application number
AT81106100T
Other languages
German (de)
Inventor
Rudolf Brunner
Original Assignee
Heilmeier & Weinlein
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 & Weinlein filed Critical Heilmeier & Weinlein
Application granted granted Critical
Publication of ATE17029T1 publication Critical patent/ATE17029T1/en

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).
AT81106100T 1981-08-04 1981-08-04 PNEUMATIC ACTUATED HYDRAULIC PUMP. ATE17029T1 (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
ATE17029T1 true ATE17029T1 (en) 1986-01-15

Family

ID=8187841

Family Applications (1)

Application Number Title Priority Date Filing Date
AT81106100T ATE17029T1 (en) 1981-08-04 1981-08-04 PNEUMATIC ACTUATED 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
EP0071655A1 (en) 1983-02-16
EP0071655B1 (en) 1985-12-18
DE3173248D1 (en) 1986-01-30

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Legal Events

Date Code Title Description
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