WO2010045929A2 - Vorrichtung zum erzeugen eines oszillierenden fluidstroms sowie vorrichtung zum erzeugen eines oszillierenden hubes eines werkzeugs - Google Patents
Vorrichtung zum erzeugen eines oszillierenden fluidstroms sowie vorrichtung zum erzeugen eines oszillierenden hubes eines werkzeugs Download PDFInfo
- Publication number
- WO2010045929A2 WO2010045929A2 PCT/DE2009/001459 DE2009001459W WO2010045929A2 WO 2010045929 A2 WO2010045929 A2 WO 2010045929A2 DE 2009001459 W DE2009001459 W DE 2009001459W WO 2010045929 A2 WO2010045929 A2 WO 2010045929A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- oscillating
- generating
- segment
- spherical segment
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C3/00—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type
- F04C3/06—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged otherwise than at an angle of 90 degrees
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
Definitions
- the invention relates to a device for generating an oscillating fluid flow and to an apparatus for generating an oscillating stroke of a tool.
- rotary pumps In order to generate a fluid flow, pumps operating according to several methods, in particular rotary pumps, are known.
- Known rotary pumps usually have a pump stator with a cylindrical cavity in which a rotatably driven rotor disk is arranged eccentrically.
- the rotor disk usually has two or more radially slidably guided sliding shoes on their outer peripheral surfaces which protrude beyond the outer surface and which extend through the cavity to the inner circumferential surface of the pump stator.
- the working space of the pump which is limited by the rotor disk and the pump stator, is subdivided by the sealing sliding shoes into working chambers whose volumes change periodically. In places of the largest or the smallest volume passageways in the form of inlet and outlet channels are provided in the cylindrical cavity.
- Such pumps are in particular for Conveying liquids and gases in a preferred direction suitable as a continuous fluid stream.
- rotary pumps for example, hydraulic cylinders for lifting and lowering of loads can be operated.
- the pumps operate at speeds of a few 1000 revolutions per minute and, due to their structural design, allow a constant or pulsating but no oscillating fluid flow into and out of the cavity between the rotor disc and the pump stator.
- the working piston For fast reciprocating a low mass having working piston of a working cylinder, as is necessary for example for cutting or sawing webs or thin sheet of material, the working piston must be acted upon by an oscillating fluid flow of high frequency, alternately pressure in the opposite direction to the Working piston exerts.
- the above-described known rotary pumps are unsuitable.
- the invention has for its object to provide a device for generating an oscillating fluid flow and a device for generating an oscillating stroke of a tool. This object is achieved by devices with the features of the independent claims. Further advantageous embodiments can be found in the dependent claims.
- the inventive device for generating an oscillating fluid flow has a spherical segment-shaped, filled with a fluid or fillable cavity with a circular cavity bottom plate.
- a rotationally driven ball segment is arranged, which is preferably formed as a hemisphere.
- the ball segment has a planar ball segment bottom and a spherical ball segment cap.
- the cavity bottom plate and the ball segment bottom are arranged at an angle to each other and define a spherical wedge-shaped space between the cavity bottom plate and the spherical segment bottom.
- the ball segment has an axis of rotation which extends perpendicular to the cavity bottom plate and inclined with respect to the central center axis of the ball segment and is aligned with the center of the cavity bottom plate.
- the spherical wedge-shaped intermediate space is subdivided into two working chambers by a pendulum plate movably arranged between the cavity bottom plate and the spherical segment bottom.
- the pendulum plate is centrally, rectangularly inserted into the cavity floor plate and touches the ball segment floor with a plant edge, the pendulum plate is pivotable about a virtual pivot point in the middle of the contact edge.
- On both sides of the pendulum plate passageways for the fluid are provided in the cavity bottom plate. They allow the transport of the fluid from or into the working chambers of the intermediate space between the cavity bottom plate and the spherical segment bottom.
- the abutment edge of the oscillating plate may optionally have a low-wear seal of another suitable material extending along the abutment edge.
- the spherical segment rotates at high speed into the spherical segment-shaped cavity at a distance from the cavity bottom plate, wherein the oscillating plate is always in sealing contact with the spherical segment bottom over the entire length of its contact edge.
- the separated from the pendulum plate working chambers of the device have the working chamber floor the same size circular segments of the cavity bottom plate, wherein the height of the two working chambers is variable, in which the spherical segment is rotated about its axis of rotation.
- the volumes of the working chambers continuously change periodically, wherein the increase in volume of a first of the two working chambers always corresponds exactly to the volume decrease of the other second working chamber or the volume decrease of the first working chamber is the same size as the increase in volume of the second working chamber.
- the ball segment whose spherical segment cap has a small gap to a spherical cap portion of the cavity, can rotate at 3000 to 12000 or even more revolutions per minute in the cavity, which corresponds to a frequency of about 50 to 200 Hz or greater.
- the fluid is transported in the working chambers 50 to 200 times per second through the passageways in and out of the cavity, in particular expressed and sucked.
- a working piston an oscillating cylinder working with low axial stroke with. higher frequency to be moved back and forth.
- the device has a relative to the cavity sealed drive axle for the ball segment, which is arranged in extension of the rotation axis on the ball segment bottom opposite side of the spherical segment cap.
- This prevents capillary action or pressure in the circumferential gap between the ball segment cap and the ball portion cap of the cavity from undesirably expelling migratory fluid from the cavity on the drive axle.
- a seal between the spherical segment cap and the cavity ball portion cap is therefore not necessary.
- the fluid received by the circumferential gap can thus lubricate the device in the region of the rotating spherical segment cap.
- the ball segment has a groove extending from the drive axis to a circular spherical segment edge.
- the spherical segment edge is the edge on which the spherical segment cap and the spherical segment bottom of the spherical segment adjoin one another.
- the groove assists in the migration of fluid into the only a few micrometers circumferential gap between the ball segment cap of the ball segment and the ball portion cap of the cavity and thus increases the wetting of the corresponding circumferential surfaces with the fluid.
- groove ends of the groove may advantageously be arranged at a distance from the starting axis and the spherical segment edge, and the cavity at the height of the groove ends additionally has passage openings for the fluid.
- a fluid circuit in the groove of the drive axle near the groove end in the direction of the spherical segment edge Connecting the additional passages outside the cavity of the device with each other, causes a rapid rotation of the ball segment, due to different centrifugal forces in the vicinity of the drive axis and the Kugelsegmentkante, a fluid circuit in the groove of the drive axle near the groove end in the direction of the spherical segment edge.
- the fluid circuit may be assisted by an associated pump so that a continuous flow of fluid at an adjustable pressure is passed through the groove.
- the device according to the invention for generating an oscillating stroke of a tool has an above-described device according to the invention for generating an oscillating fluid flow to a working cylinder of the device.
- the tool is attached to a piston rod of the working cylinder in the axial direction, wherein the working cylinder is urged to move the piston rod with the attached tool with an oscillating fluid flow.
- the passageway of the first and the second working chamber of the device for generating an oscillating fluid flow is connected to a respective pressure chamber of the working cylinder, which can pressurize the piston rod axially in the opposite direction with pressure.
- the high-frequency oscillating fluid flow leads to an axial oscillating oscillatory movement of the piston rod with the appropriate frequency and sinusoidal acceleration behavior of the piston rod with a high degree of smoothness of the piston rod in the working cylinder.
- a fluid with low compressibility and lubricating properties is used, as well as pressure-resistant connections between the fluid flow generating device and the working cylinder.
- a vibration damping body movable by a fluid is preferably arranged in the working cylinder, which is driven in an oscillating manner by a second oscillating fluid flow counter to the direction of the piston rod.
- the piston rods and the vibration damping body are always moved in synchronism with each other in the opposite direction, wherein the mass of the vibration damping body preferably corresponds to the mass of the piston rod with the tool attached thereto.
- the transmitted by the acceleration forces of the piston rod to the working cylinder housing energy surges are largely compensated by the energy shocks directed by the vibration damping body in the opposite direction. This advantageously leads to a fast, quiet and low-vibration movement of the tool.
- the second oscillating fluid flow starts from a second device according to the invention, as described above.
- the passageways are connected in a similar manner with associated pressure chambers of the working cylinder.
- the oscillating fluid flow for the vibration damping body must have a phase shift of 180 degrees relative to the oscillating fluid flow for the piston rod.
- the driven Ball segments to each other and relative to the pendulum plate have a constant rotational offset of 180 degrees.
- the two devices for generating the two fluid streams on a common drive, which drives the ball segments of the two devices preferably in opposite directions.
- the coupling of the two devices for generating the oscillating fluid streams is carried out such that the mutually corresponding working chambers express the fluid by a half revolution of the spherical segments offset in time and suck.
- the common drive a synchronous movement of the ball segments is ensured, wherein the opposing movement of the two spherical segments of the two devices for fluid flow generation reliably prevents deflection of the working cylinder in one or the other circumferential direction.
- the device for generating the fluid flow is advantageously connected to a heat expansion compensating tank for the fluid.
- the thermal expansion reservoir may include a biased diaphragm that maintains the pressure of the fluid flow approximately constant with temperature changes of the device or fluid.
- the erfindungsmä on devices allow by the oscillating fluid flow, for example, a hydraulic oil can be used as a fluid at high frequency change in the direction of movement of the piston rod a virtually vibration-free running of the attached to the piston rod tool.
- the device according to the invention for generating an oscillating stroke, in particular for driving a cutting blade or a jig saw is ideally suited.
- a low-wear bearing of the piston rod is at least at a front end of the working cylinder advantageous, which can be preferably realized by a ceramic bearing.
- a uniform continuous movement of the tool is achieved when using a liquid which does not outgas at the operating temperature of the device, for example an oil with suitable viscosity. Due to its low compressibility, a liquid fluid is far better suited than a gaseous fluid, since the hydraulics have the advantage over the pneumatic system that much higher forces can be transmitted and very uniform and exact movements of the piston rod are possible. The compression is so low for a suitable liquid fluid that it is negligible. The piston rod performs reliably regardless of the frequency of the oscillated fluid flow at half a revolution of the driven ball segment always the same stroke.
- the proposed device for generating the oscillating stroke for the tool does not require stop mounts for the piston rod, since the stroke of the piston rod is determined and thus limited by the volume changes of the two working chambers of the fluid flow generating device.
- the conversion of the rotational energy of the ball segment in the translation energy for the working piston valve-free and without electronic control for the fluid flow whereby the device is particularly is reliable.
- a simple speed control for the drive motor of the ball segment is sufficient.
- FIG. 1 shows a device according to the invention for generating an oscillating fluid flow in a schematic representation
- FIG. 2 shows a first device according to the invention without vibration damping body for generating an oscillating stroke of a tool in a schematic representation
- FIG 3 shows a second device according to the invention with vibration damping body for generating an oscillating stroke of a tool in a schematic representation.
- FIG. 1 shows a device 1 according to the invention for generating an oscillating fluid flow, with a spherical segment-shaped cavity 2 having a circular cavity bottom plate 3 and a spherical cavity cap 4.
- a rotationally driven ball segment 5 in the form of a hemisphere, with a spherical segment bottom 6 and a likewise spherical spherical segment cap 7, is arranged.
- the ball segment bottom 6 and the cavity bottom plate 3 are inclined to each other and at a distance from each other. They limit a spherical wedge-shaped gap 8 on opposite sides.
- the ball segment 5 has a relative to the central center axis 9 by a few degrees inclined rotational axis 10 which is aligned with the center 11 of the cavity bottom plate 3 and which extends perpendicular to the cavity bottom plate 3.
- the inclination of the rotation axis 10 with respect to the central axis 9 is typically between 1 and 10 degrees.
- a pendulum plate 12 is recessed centrally at right angles, which is held on the spherical segment bottom 6 with a contact edge 13 sealingly in abutment.
- the pendulum plate 12 is designed as a semi-circular disc and received in a complementary formed receiving groove 14, wherein the pendulum plate 12 is slidably guided on the semicircular circumference.
- the pivoting of the pendulum plate 12 about a virtual pivot point 15 takes place when rotating the ball segment 5 through the ball segment bottom 6, which exerts pressure on the one or the other half of the abutment edge 13 of the pendulum plate 12 depending on the position of the ball segment 5 in the cavity 2 ,
- the cavity bottom plate 3 also has passageways 16, 17 for a fluid, not shown in the drawing, which are arranged on both sides of the pendulum plate 12.
- the passage channels 16, 17 are used for oscillating transport of the fluid from or into the gap 8 between the cavity plate 3 and the spherical segment bottom 6, which is divided by the pendulum plate 12 into two working chambers 18, 19.
- the two working chambers 18, 19 act on the fluid in an alternating sequence with pressure or suction, when the ball segment 5 rotates in the cavity 2, wherein the two passage channels 16, 17 act alternately as inlet and outlet channels.
- the device 1 has a relative to the cavity 2 sealed drive shaft 20 for the ball segment 5, which in extension of the axis of rotation 10 on the ball segment bottom 6 opposite side of Ball segment cap 7 is arranged.
- the drive shaft 20 of the ball segment 5 can be coupled to a drive shaft of any motor.
- the spherical segment 5 on the spherical segment cap 7 has a groove 22 extending from the drive axis 20 to form a circular spherical segment edge 21, whose groove ends 23 are arranged at a distance from the drive axis 20 and the spherical segment edge 21.
- a spherical segment edge 21 the circular line is understood, at which the spherical segment cap 7 and the spherical segment bottom 6 abut each other.
- the groove 22 is not shown to scale for clarity.
- additional passage openings 24 for supplying a fluid for lubricating the ball segment 5 are arranged on the cavity 2.
- the fluid used is preferably the same fluid as for the oscillating fluid flow.
- Figure 2 shows a first embodiment of the inventive device 25 for generating an oscillating stroke of a tool 26 which is fixed to a piston rod 27 of a working cylinder 28 in the axial direction.
- the working cylinder 28 is acted upon by the movement of the tool with an oscillating fluid flow, which starts from a fluid generating device 1 according to the invention according to FIG.
- the passage channels 16, 17 of the fluid generating device 1 are connected to supply lines 29, 30 with pressure chambers 31, 32 of the working cylinder.
- the pressure chambers 31, 32 act on the piston rod 27 of the working cylinder 28 from opposite sides with the oscillating fluid flow, whereby the working cylinder 28 with the tool 26 attached thereto is moved axially with a predetermined stroke at a corresponding frequency.
- the heat balance tanks 33, 34 ensure a constant operating pressure of the oscillating fluid flow to the working cylinder 28 as the temperature of the fluid increases as the operating time of the lift generating device 25 increases.
- Figure 3 shows a second embodiment of the inventive device 25 for generating an oscillating stroke of a tool 26, which starts from the first embodiment shown in Figure 2.
- the power cylinder 28 has, in addition to the piston rod 27, a vibration damping body 35 that is moved in the opposite direction to the piston rod 27 in the power cylinder 28.
- the vibration damping body 35 is moved by a second oscillating fluid flow, which also starts from a fluid generating device 1 according to the invention shown in FIG.
- the two devices 1 for generating the two fluid streams have a common drive 36, which preferably drives the ball segments 5 of the two devices 1 in opposite directions via a toothed belt 37.
- the two fluid-generating devices 1 are each connected to supply lines 29, 30 to the working cylinder 28.
- the ball segments 5 in the cavity 2 of the fluid generating devices 1 are offset by 180 degrees to each other via the toothed belt 37 with each other. For this reason, the supply lines 29, 30 of the two fluid generating devices 1 are connected in the same direction with the pressure chambers 31, 32 for the piston rod 27 and the pressure chambers 38, 39 for the vibration damping body 35.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transmission Devices (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200911003256 DE112009003256B4 (de) | 2008-10-20 | 2009-10-20 | Vorrichtung zum erzeugen eines oszillierenden fluidstroms sowie vorrichtung zum erzeugen eines oszillierenden hubes eines werkzeugs |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200820013877 DE202008013877U1 (de) | 2008-10-20 | 2008-10-20 | Vorrichtung zum Erzeugen eines oszillierenden Fluidstroms sowie Vorrichtung zum Erzeugen eines oszillierenden Hubes eines Werkzeugs |
DE202008013877.9 | 2008-10-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010045929A2 true WO2010045929A2 (de) | 2010-04-29 |
WO2010045929A3 WO2010045929A3 (de) | 2011-03-10 |
Family
ID=40227425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2009/001459 WO2010045929A2 (de) | 2008-10-20 | 2009-10-20 | Vorrichtung zum erzeugen eines oszillierenden fluidstroms sowie vorrichtung zum erzeugen eines oszillierenden hubes eines werkzeugs |
Country Status (2)
Country | Link |
---|---|
DE (2) | DE202008013877U1 (de) |
WO (1) | WO2010045929A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10093011B2 (en) | 2013-11-13 | 2018-10-09 | C. & E. Fein Gmbh | Oscillatingly driven machine tool |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202012101137U1 (de) | 2012-03-29 | 2012-04-18 | Reinhard Diem | Hydraulische Drehantriebsvorrichtung |
DE102012208511A1 (de) * | 2012-05-22 | 2013-11-28 | Robert Bosch Gmbh | Als Pumpe, Verdichter oder Motor für pastöses, flüssiges oder gasförmiges Medium arbeitende Drehkolbenmaschine |
DE202013011687U1 (de) * | 2013-11-13 | 2015-02-23 | C. & E. Fein Gmbh | Oszillierend antreibbare Werkzeugmaschine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1881575A (en) * | 1931-01-05 | 1932-10-11 | Carl W Herzog | Rotary pump |
DE613381C (de) * | 1933-11-12 | 1935-05-18 | Justus Braun Dipl Ing | Drehkolbenmaschine mit halbkugelfoermigem Arbeitsraum |
GB573278A (en) * | 1943-11-17 | 1945-11-14 | Robert Filmer Bridgland | Improvements in rotary engines, pumps, blowers or the like |
DE3634094A1 (de) * | 1986-10-07 | 1988-04-14 | Bosch Gmbh Robert | Hydraulische oder pneumatische arbeits- und kraftmaschine |
-
2008
- 2008-10-20 DE DE200820013877 patent/DE202008013877U1/de not_active Expired - Lifetime
-
2009
- 2009-10-20 WO PCT/DE2009/001459 patent/WO2010045929A2/de active Application Filing
- 2009-10-20 DE DE200911003256 patent/DE112009003256B4/de not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1881575A (en) * | 1931-01-05 | 1932-10-11 | Carl W Herzog | Rotary pump |
DE613381C (de) * | 1933-11-12 | 1935-05-18 | Justus Braun Dipl Ing | Drehkolbenmaschine mit halbkugelfoermigem Arbeitsraum |
GB573278A (en) * | 1943-11-17 | 1945-11-14 | Robert Filmer Bridgland | Improvements in rotary engines, pumps, blowers or the like |
DE3634094A1 (de) * | 1986-10-07 | 1988-04-14 | Bosch Gmbh Robert | Hydraulische oder pneumatische arbeits- und kraftmaschine |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10093011B2 (en) | 2013-11-13 | 2018-10-09 | C. & E. Fein Gmbh | Oscillatingly driven machine tool |
Also Published As
Publication number | Publication date |
---|---|
DE112009003256A5 (de) | 2012-11-15 |
WO2010045929A3 (de) | 2011-03-10 |
DE112009003256B4 (de) | 2015-04-30 |
DE202008013877U1 (de) | 2009-01-08 |
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