EP0742373A1 - Appareil moteur pneumatique - Google Patents

Appareil moteur pneumatique Download PDF

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Publication number
EP0742373A1
EP0742373A1 EP96107419A EP96107419A EP0742373A1 EP 0742373 A1 EP0742373 A1 EP 0742373A1 EP 96107419 A EP96107419 A EP 96107419A EP 96107419 A EP96107419 A EP 96107419A EP 0742373 A1 EP0742373 A1 EP 0742373A1
Authority
EP
European Patent Office
Prior art keywords
piston
pneumatic drive
chamber
drive device
switching element
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.)
Granted
Application number
EP96107419A
Other languages
German (de)
English (en)
Other versions
EP0742373B1 (fr
Inventor
Zsolt Szabo
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 EP0742373A1 publication Critical patent/EP0742373A1/fr
Application granted granted Critical
Publication of EP0742373B1 publication Critical patent/EP0742373B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves

Definitions

  • the present invention relates to a pneumatic drive device.
  • the object of the present invention is to provide a pneumatic drive device that is mechanically simple and works satisfactorily even at lower pressures.
  • a pneumatic drive device is specified with a cylindrical housing in which a piston element is guided in an axially displaceable manner, the piston element having a front piston and a rear piston at the end, which are connected to one another by a connecting tube, a switching element mounted in the housing between the pistons, which defines a variable front chamber with the front piston and a variable rear chamber with the rear piston and two pressurizable inlet openings formed in the housing, which can be connected to the front or rear chamber, the switching element in a first position exposing the inlet opening to the rear chamber, so that the rear piston moves axially outwards and the front piston axially inwards, and in a second position the inlet opening to the front chamber is free.
  • the front piston axially outwards and the rear piston axially migrates inward, with the piston moving inward in each case switching the envelope element between the two positions.
  • a universally usable pneumatic drive device is created, the pistons of which alternately carry outward impacts or pulses at a certain frequency.
  • the strength of the blows can be adjusted by dimensioning the pressure supplied and the dimensions of the components.
  • the change in the direction of movement of the pistons coupled to one another is carried out by a switching element which is positively controlled by the piston element and which alternately opens the chambers assigned to the piston in terms of printing technology, the returned pistons switching over the switching element.
  • the pneumatic drive device can use air-bearing twin pistons that are positively controlled by the switching element. The energy brought in by the pressure is effectively and continuously converted without loss. Due to the air bearing, low friction losses occur, so that a significantly higher efficiency than with conventional drive devices can be achieved.
  • the pneumatic drive device according to the invention can be used universally for all pulse-controlled or impact-controlled drive problems. It can be used particularly advantageously for implanting and explanting prostheses and intramedullary nails or for medical rasps and saws, in particular for prosthetic purposes.
  • the switching element has two radial sealing lips, which serve to mutually close the inlet openings.
  • the radial sealing lips serve on the one hand to form the front and rear chambers, which exist between the respective radial sealing lip and the inner surface of the piston.
  • the radial sealing lips serve in a second function to close the inlet openings. This double function is space-saving and reduces the total required components.
  • the distance between the two radial sealing lips is less than the distance between the inlet openings. In this way, a favorable mutual or alternative closure of the inlet openings is possible.
  • the connecting pipe has at least one front exhaust opening for venting the front chamber and at least one rear exhaust opening for venting the rear chamber. This facilitates the return movement of the corresponding piston, as a result of which the volume contained in the corresponding chamber is discharged.
  • the connecting tube is preferably passed through the switching element, so that both elements lead axially to one another. This also reduces the number of components and the space required.
  • the pistons have through openings formed on the end face for residual ventilation.
  • through openings formed in the housing can also be provided in order to support the residual ventilation.
  • through openings formed on the end face in the piston are provided. These complement the effect of the exhaust openings in the connecting pipe.
  • the connecting tube is preferably passed through the pistons and open at the end.
  • Figure 1 shows a perspective view of a half-broken embodiment a pneumatic drive device according to the invention.
  • Figure 2 shows a cross section through the embodiment of Figure 1.
  • the pneumatic drive device shown in the figures has a housing 2 which has two sections of different inner diameters.
  • the outer diameter of the housing is the same over the entire length.
  • the different dimensioning of the section cross sections or piston cross sections allows the pulse amplitude to be set in the respective direction, so that different pulse amplitudes or power pulse amplitudes can be set.
  • the two sections can alternatively have the same diameter.
  • An axially displaceably mounted front piston 4 is provided in the section of the housing 2 with a larger inner diameter, while a correspondingly smaller rear piston 6 is provided in the section of the housing 2 with a smaller diameter.
  • the two pistons 4 and 6 are connected to one another by an internally hollow connecting tube 8 and therefore carry out common movements.
  • a switching element 10 is used approximately in the center of the housing 2 and serves for the mutual pressurization of the two pistons 4 and 6.
  • the switchover element 10 has two sealing lips 12, 12 ′ which are arranged at an axial distance from one another and are both located in the housing section of smaller diameter. Between the front sealing lip 12 'and the front piston 4 arranged opposite, there is a front chamber 14 which serves as a pressurizing chamber for the piston 4. There is a rear chamber 16 between the rear sealing lip 12 and the rear piston 6 arranged opposite, which serves as a pressurizing chamber for the piston.
  • inlet openings 18, 20 which are arranged at an axial distance from one another and which serve to pressurize the two chambers 14 and 16.
  • the two inlet openings 18, 20 open in the region of the axially displaceably mounted switching element 10.
  • the switching element 10 is designed and installed in such a way that it can be displaced between a first left position shown in FIG. 2 and a second position (not shown).
  • the inlet opening 18 to the front chamber 14 is blocked by the sealing lip 12 ', so that the chamber 14 cannot be pressurized.
  • the inlet opening 20 is in communication with the rear chamber 16.
  • the two inlet openings 18, 20 are connected to a pressure source, so that the pressure medium flowing into the chamber 16 moves the piston 6 outwards, while the volume of the chamber 16 is increased. Since the two pistons 4 and 6 are coupled, the piston 4 executes an inward movement in the same direction.
  • the axially outermost end of the switching element 10 is formed by a sleeve 26 against which the piston 4 abuts during its return movement.
  • the piston 4 guides the switching element from a first position (shown on the left in FIG. 2) to the second position (not shown), in which the inlet opening 18 to the front chamber 14 is open, while the inlet opening 20 to the rear, by abutment against the sleeve 26 Chamber 16 is now closed.
  • the pressure line connected to the inlet opening 18 leads pressure medium into the front chamber 14 which thereby expands, as a result of which the piston 4 is driven outwards.
  • the piston 6 executes an inward movement which in the last third of the movement leads to abutment against a sleeve 26 'formed in the switching element 10 at the end.
  • the recoiling piston 6 pushes the switching element 10 from its second position back into its first position (shown in FIG. 2) by abutment on the sleeve 26 '.
  • Each of the two pistons 4 and 6 leads to a reciprocating movement of the two pistons.
  • Each of the two pistons can be used as a pneumatic drive device.
  • the connecting pipe 8 there are two discharge openings for opening in the chamber 14 22, 22 'are formed, which serve to discharge the pneumatic volume received in the chamber 14.
  • the connecting tube 8 is passed through the piston 4 and opens on its outer end face.
  • the connecting tube 8 is also passed through the piston 6 and opens on its outer end face.
  • through openings formed in the front of the two pistons 4, 6 or a gap formed between the cylinder and the piston are provided, which are used for residual ventilation. These interact appropriately with the discharge openings 22, 22 'and 24, 24'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP96107419A 1995-05-09 1996-05-09 Appareil moteur pneumatique Expired - Lifetime EP0742373B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19516977 1995-05-09
DE19516977A DE19516977C2 (de) 1995-05-09 1995-05-09 Pneumatische Antriebsvorrichtung

Publications (2)

Publication Number Publication Date
EP0742373A1 true EP0742373A1 (fr) 1996-11-13
EP0742373B1 EP0742373B1 (fr) 1999-08-18

Family

ID=7761455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96107419A Expired - Lifetime EP0742373B1 (fr) 1995-05-09 1996-05-09 Appareil moteur pneumatique

Country Status (4)

Country Link
US (1) US5676033A (fr)
EP (1) EP0742373B1 (fr)
AT (1) ATE183573T1 (fr)
DE (1) DE19516977C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011014954A1 (fr) * 2009-08-04 2011-02-10 Depiak Industrial Technology Corporation Moteur linéaire alternatif entraîné par fluide
JP6665985B2 (ja) * 2017-04-07 2020-03-13 Smc株式会社 増圧装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130890A1 (fr) * 1983-06-24 1985-01-09 MECAGRAV S.A. Société anonyme dite: Vérin multiplicateur de pression
DE3607063A1 (de) * 1985-03-15 1986-09-25 Finomszerelvénygyár, Eger Steuerventil fuer doppelwirkende pneumatische arbeitszylinder

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2818022A (en) * 1956-03-14 1957-12-31 Phillips Petroleum Co Bottom hole hydraulic pump
DE1703726C3 (de) * 1968-07-03 1974-03-07 Rilco Maschinenfabrik Gmbh & Co Kg, 7407 Dusslingen Druckflüssigkeitsbetriebene Vorrichtung zur Erzeugung einer hin- und hergehenden Bewegung
US4033134A (en) * 1976-06-11 1977-07-05 Bentley Arthur P Heat engine
ZA764220B (en) * 1976-07-15 1978-02-22 Compair Sa Ltd Improvements in or relating to hydraulically powered percussive apparatus
US4174928A (en) * 1978-03-13 1979-11-20 Austin Richard D Double acting concrete pump
US4759260A (en) * 1978-05-17 1988-07-26 Lew Yon S Super reliable air-spring return air cylinder
US4364303A (en) * 1980-09-08 1982-12-21 Sumida Kunio A Air operated reciprocating tool
US5470209A (en) * 1993-10-13 1995-11-28 Shurflo Pump Manufacturing Co. Offset reciprocable device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130890A1 (fr) * 1983-06-24 1985-01-09 MECAGRAV S.A. Société anonyme dite: Vérin multiplicateur de pression
DE3607063A1 (de) * 1985-03-15 1986-09-25 Finomszerelvénygyár, Eger Steuerventil fuer doppelwirkende pneumatische arbeitszylinder

Also Published As

Publication number Publication date
DE19516977C2 (de) 1997-03-27
EP0742373B1 (fr) 1999-08-18
US5676033A (en) 1997-10-14
ATE183573T1 (de) 1999-09-15
DE19516977A1 (de) 1996-11-21

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