EP1160451A2 - Kolbenpumpe - Google Patents
Kolbenpumpe Download PDFInfo
- Publication number
- EP1160451A2 EP1160451A2 EP01113234A EP01113234A EP1160451A2 EP 1160451 A2 EP1160451 A2 EP 1160451A2 EP 01113234 A EP01113234 A EP 01113234A EP 01113234 A EP01113234 A EP 01113234A EP 1160451 A2 EP1160451 A2 EP 1160451A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- shoulder
- sealing surface
- pump according
- valve disc
- 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
Links
Images
Classifications
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/12—Valves; Arrangement of valves arranged in or on pistons
- F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston
Definitions
- the invention relates to a piston pump with a Pump housing and a piston with its End face and a pump cylinder a work space limited by a first check valve with a Hydraulic medium supply and a second Check valve is connected to a working cylinder which piston from the end position of the largest Working space volume against the force of a spring End position of the smallest working space volume axially back and forth can be moved.
- the invention relates a hydraulic piston pump for driving hydraulic Work tools.
- Piston pumps of this type are generally known and are used also for the drive of pressing tools with high and highest pressures.
- Tools are often battery operated Drive motors used, the torque limited is. Accordingly, the maximum pressure is also limited is buildable by such a piston pump, because that Torque generates the maximum force with which the piston can be driven into the pump cylinder.
- the invention has for its object a Piston pump of the type described above too improve that with the same maximum torque too higher pressures can be achieved. Nevertheless, the The pump is simply constructed.
- the section of the Piston with an extension with a smaller diameter is provided, which is a paragraph to the End face of the piston connects and the one is thickened free piston end with one facing the heel Sealing surface that between the paragraph and the Sealing surface there is at least one valve disk
- the sealing in the pump cylinder and through the the connection of the work space to the second valve is closable and has an axial thickness that is smaller than the distance between the sealing surface and of the paragraph so that the valve disc between the Heel and the sealing surface axially reciprocable is
- the valve disc with at least one Breakthrough is provided through which the work area with the second check valve is connectable and at the contact of the valve disc on the sealing surface closed is.
- the return spring is not at relatively higher pressures more capable of thickening the piston end against the pressure in the working cylinder and thus completely in the working area attributed.
- the work room also has one Stop on which the valve disc is in one position of the piston lies between the end positions. In order to becomes a small work space through the valve disc formed by the piston only with its sales surface is pressurized. It is envisaged that the free area of the paragraph is smaller than the effective area of the thickened piston end. This allows an equal size Torque and thus an equal force on the Pistons generate a higher pressure.
- the thickened piston end has circumferential collar, the heel facing side forms the sealing surface.
- the Sealing surface opposite side of the collar can The spring attack the piston on the opposite side of the work area. This allows a relatively large and strong spring in the Work space to be integrated, so that correspondingly high Pressures can be generated.
- the thickened piston end as a hat-shaped piston sleeve trained, which is attached to the extension.
- This piston sleeve is preferably releasable on the Extension attached.
- the piston unit thus from three separate parts, namely the piston with extension, the valve disc and the piston sleeve formed, which are easy and inexpensive to manufacture.
- the piston sleeve can also be moved on the extension as long as it is guaranteed that between the Valve disc and the sealing surface or paragraph depending on Layer a gap remains. This gap can be very small as long as the hydraulic medium can flow through.
- the piston in an inserted socket is guided in the pump housing.
- This has the advantage that the piston unit with return spring in one cylindrical working area of the pump housing can be used is then down through the socket is limited.
- This socket can be used at the same time Form stop for the valve disc, which is directly in sealing the cylindrical recess of the pump housing is led.
- valve disc is guided in the socket used, which is in Direction to the work space, forming the stop extended for the valve disc.
- the advantage is that the bush optimally to the guidance of the piston on the one hand and adapted the leadership of the valve disc on the other hand can be. With both measures it is possible that the Bush made of a different material than the piston and / or the pump housing exists.
- the pump shown in the drawing has Pump housing 11 in which a cylindrical piston 12th back and forth in a cylindrical working space 13 is movably mounted.
- the working space 13 is over a first check valve 14 in connection with a Storage container for the pressure medium, especially for a Hydraulic medium such as oil.
- a Hydraulic medium such as oil.
- the piston moves downwards in the drawing Hydraulic medium in the work area.
- a second Check valve 15 is present, through which the Hydraulic medium during the compression stroke of the piston in the drawing upwards into a working cylinder 16 reached.
- the piston 12 is by a not shown Eccentric drive on one of the housing 11 protruding lower stop 17 attacks against a compression spring 18 in the top dead center position driven. The provision in the lower Dead center position is only due to the spring force.
- the structure corresponds to a conventional one Hydraulic piston pump and therefore requires no further Explanation.
- the section of the projecting into the working space 13 Piston 12 includes a cylindrical extension 19 smaller diameter than the shaft 20 of the piston 12, which extension is connected to the piston via a shoulder 21 connects.
- a thickened one Piston end 22 is present, which has a sealing surface 23 has its side facing paragraph 21. in the individual, the arrangement is made so that thickened piston end as a hat-shaped piston sleeve is formed, which is attached to the extension.
- the piston sleeve has a circumferential collar 24 provided, which on the one hand has the sealing surface 23 and on the other hand forms a stop for the compression spring 18.
- the dimensions of the piston sleeve and its recess 25 for the extension 19 of the piston are made such that a distance between the sealing surface 23 and the shoulder 21 is available.
- this can also be done achieved that the piston has a recess, into which a pin with a corresponding thickened end is inserted.
- the parts don't have to be tight be connected. Rather, one is enough Slide fit for a loose plug connection.
- valve disc 26 It is between the thickened piston end 22 and the Paragraph 21 a valve disc 26 is present, the sealing is guided in the work area and its axial thickness is smaller is the distance between the sealing surface 23 and the shoulder 21. The valve disc is thus axially free in between the extension 19 reciprocable. There are Openings 27 are present on the valve disk 26, which at least in the top dead center position Working space 13 with the second check valve 15 connect. However, if the valve disc is on the Sealing surface 23 as shown in Fig. 3 are the Openings closed. Furthermore, the arrangement is so hit that the valve disc from one Intermediate position of the piston towards the lower one Dead center the connection from the work space 13 to the second Check valve closes tightly. This connection 35 is located in the lower area of the work area, so that their sealing in the area of the lower Dead center position of the piston takes place.
- the piston 12 is in a sleeve 28 in the pump housing 11 used. This makes a stop 29, among other things formed for the valve disc 26, the movement of which in Direction to the bottom dead center of the piston beforehand limited. However, the piston will move due to the adjacent upper inner end wall of the piston sleeve move further in this direction such that a Room 30 between page 31 facing paragraph 21 the valve disc 26 and the paragraph remains.
- the socket 28 is formed as a hollow cylinder.
- the Valve disc is thus directly on the inner wall of the work space 13 performed sealing.
- the socket 32 has one towards the work area via a stop 33 expanding hollow cylindrical portion 34 in which the valve disc is sealingly guided.
- the socket 32 and the socket section 34 can be made in one piece or else there are two individual socket sections.
- the material These sockets 28, 32, 34 can thus meet the requirements be optimally adjusted.
- a less expensive material for the pump housing are used while the sockets 28, 32, 34 die have the required sealing and sliding properties.
- the are mutually movable Parts, in particular the piston shaft 20 in the bushing 28, 32, shown without additional seals. Basically rubber-elastic seals can be provided here.
- the work space 13 can have at least one Have vent screw 37 to prevent air pockets remove and around the working area with hydraulic medium fill.
- This ventilation is dashed in Fig. 4 shown and can in the other versions also be included.
- the eccentric then hits the lower stop 17 again and pushes the piston up. It will be first by the hydraulic medium present in the room 30 Valve disc pushed up, and the hydraulic medium passes through the check valve 15 in the Working cylinder 16. As the stroke continues of the piston to top dead center becomes the end of the piston 22 further pushed up, and there is a gap 36 formed between sealing surface 23 and valve disk 26, so that the hydraulic medium from the working space 13 in the Working cylinder 16 can be pressed.
- the piston 12 therefore only moves in the high pressure range along part of its maximum stroke. In particular the pressure no longer affects the entire surface of the thickened piston end on the eccentric. Rather it will achieved through the special training that only the Heel surface 21 displaces the hydraulic medium, the is smaller. Accordingly, the force to be applied is also smaller for higher pressures, so that an equal torque of the engine can generate a higher pressure, which in Working cylinder is available. In addition, the Stroke movements of the piston then only in the upper one Dead center area of the piston and thus in the upper Angular positions of the eccentric take place in which the transmissible power is particularly high.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
- Reciprocating Pumps (AREA)
- Compressor (AREA)
- Steroid Compounds (AREA)
Abstract
Description
- Fig. 1
- eine Kolbenpumpe gemäß der Erfindung mit dem Kolben im oberen Totpunkt,
- Fig. 2
- die Kolbenpumpe gemäß Fig. 1 mit dem Kolben in einer Zwischenstellung,
- Fig. 3
- die Kolbenpumpe gemäß Fig. 1 mit dem Kolben im unteren Totpunkt und
- Fig. 4
- eine Kolbenpumpe gemäß einer andere Ausführungsform der Erfindung mit dem Kolben im unteren Totpunkt.
Claims (10)
- Kolbenpumpe mit einem Pumpengehäuse (11) und einem Kolben (12), der mit seiner Stirnfläche und einem Pumpenzylinder einen Arbeitsraum (13) begrenzt, der über ein erstes Rückschlagventil (14) mit einem Hydraulikmediumsvorrat und über ein zweites Rückschlagventil (15) mit einem Arbeitszylinder (16) verbunden ist, welcher Kolben von der Endstellung des größten Arbeitsraumvolumens entgegen der Kraft einer Feder (18) zur Endstellung des kleinsten Arbeitsraumvolumens axial hin- und herberwegbar ist, dadurch gekennzeichnet, daß der in den Arbeitsraum (13) hineinragende Abschnitt des Kolbens mit einem Fortsatz (19) mit geringerem Durchmesser versehen ist, der sich über einen Absatz (21) an die Stirnfläche des Kolbens anschließt und der ein verdicktes freies Kolbenende (22) mit einer dem Absatz zugewandten Dichtfläche (23) aufweist, daß zwischen dem Absatz und der Dichtfläche wenigstens eine Ventilscheibe (26) vorhanden ist, die dichtend in dem Pumpenzylinder geführt und durch die die Verbindung (35) des Arbeitsraums (13) zum zweiten Rückschlagventil (15) verschließbar ist und die eine axiale Dicke aufweist, die kleiner ist als der Abstand zwischen der Dichtfläche und dem Absatz (21), so daß die Ventilscheibe (26) zwischen dem Absatz (21) und der Dichtfläche (23) auf dem Fortsatz (19) axial hin- und herbewegbar ist, wobei die Ventilscheibe (26) mit wenigstens einer Durchbrechung (27) versehen ist, durch die der Arbeitsraum (13) mit dem zweiten Rückschlagventil (15) verbindbar ist und die bei der Anlage der Ventilscheibe an der Dichtfläche (23) geschlossen ist.
- Kolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß das verdickte Kolbenende einen umlaufenden Kragen (24) aufweist, dessen dem Absatz zugekehrten Seite die Dichtfläche (23) bildet.
- Kolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, daß an der der Dichtfläche (23) gegenüberliegenden Seite des Kragens (24) die Feder angreift, die sich an der dem Kolben (12) gegenüberliegenden Seite des Arbeitsraums (13) abstützt.
- Kolbenpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das verdickte Kolbenende (22) als hutförmige Kolbenhülse ausgebildet ist, die auf den Fortsatz (19) aufgesteckt ist.
- Kolbenpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die freie Fläche des Absatzes (21) kleiner ist als die Wirkfläche des verdickten Kolbenendes (22).
- Kolbenpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Kolben (12) über einen Exzenter ohne Zwangsführung angetrieben wird.
- Kolbenpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Arbeitsraum (13) einen Anschlag (29, 33) aufweist, an dem die Ventilscheibe (26) in einer Stellung des Kolbens zwischen den Endstellungen anliegt und in der die Verbindung zum zweiten Rückschlagventil (15) geschlossen ist.
- Kolbenpumpe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Kolben (12) in einer eingesetzten Buchse (28, 32) in dem Pumpengehäuse (11) geführt ist.
- Kolbenpumpe nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Ventilscheibe (26) in der eingesetzten Buchse (32) geführt ist, die sich in Richtung auf den Arbeitsraums unter Bildung des Anschlags (33) für die Ventilscheibe erweitert.
- Kolbenpumpe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Buchse (28, 32) aus einem anderen Material als der Kolben und/oder das Pumpengehäuse besteht.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20115969U DE20115969U1 (de) | 2000-05-31 | 2001-05-30 | Kolbenpumpe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20009848 | 2000-05-31 | ||
DE20009848U | 2000-05-31 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1160451A2 true EP1160451A2 (de) | 2001-12-05 |
EP1160451A3 EP1160451A3 (de) | 2003-06-18 |
EP1160451B1 EP1160451B1 (de) | 2004-08-04 |
Family
ID=7942322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01113234A Expired - Lifetime EP1160451B1 (de) | 2000-05-31 | 2001-05-30 | Kolbenpumpe |
Country Status (4)
Country | Link |
---|---|
US (1) | US6499974B2 (de) |
EP (1) | EP1160451B1 (de) |
AT (1) | ATE272795T1 (de) |
DE (1) | DE50103070D1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6726459B1 (en) * | 2002-11-07 | 2004-04-27 | General Motors Corporation | Variable injection rate high pressure fuel pump |
US7306172B2 (en) * | 2003-10-27 | 2007-12-11 | Siemens Vdo Automotive Corporation | Fluidic flow controller orifice disc with dual-flow divider for fuel injector |
US7318416B1 (en) | 2005-04-07 | 2008-01-15 | Stewart Howard C | Liquid fuel pump |
US8708669B1 (en) | 2007-02-12 | 2014-04-29 | Brunswick Corporation | Fuel pumping system |
NO334755B1 (no) * | 2008-12-08 | 2014-05-19 | Gjerdrum As Ing | Drivanordning for pumpe eller kompressor |
WO2011146125A2 (en) * | 2010-05-19 | 2011-11-24 | Graco Minnesota Inc. | Removable shim clip for adjustable piston pump |
US9926416B2 (en) * | 2013-01-30 | 2018-03-27 | W. L. Gore & Associates, Inc. | Method for producing porous articles from ultra high molecular weight polyethylene |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0391489A1 (de) * | 1989-04-04 | 1990-10-10 | Flow International Corporation | Ventileinheit einer Hochdruckpumpe |
EP0878621A2 (de) * | 1997-05-16 | 1998-11-18 | Mitsubishi Denki Kabushiki Kaisha | Hochdruck-, Kraftstoffförderpumpe |
EP0933524A2 (de) * | 1998-01-30 | 1999-08-04 | Mitsubishi Denki Kabushiki Kaisha | Brennstoffhochdruckpumpe |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3347264A (en) * | 1963-12-23 | 1967-10-17 | Stuart E Bunn | Suction and discharge valve |
US3829253A (en) * | 1972-12-27 | 1974-08-13 | S Bunn | Plate valve structure |
-
2001
- 2001-05-30 AT AT01113234T patent/ATE272795T1/de not_active IP Right Cessation
- 2001-05-30 DE DE50103070T patent/DE50103070D1/de not_active Expired - Lifetime
- 2001-05-30 EP EP01113234A patent/EP1160451B1/de not_active Expired - Lifetime
- 2001-05-30 US US09/867,913 patent/US6499974B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0391489A1 (de) * | 1989-04-04 | 1990-10-10 | Flow International Corporation | Ventileinheit einer Hochdruckpumpe |
EP0878621A2 (de) * | 1997-05-16 | 1998-11-18 | Mitsubishi Denki Kabushiki Kaisha | Hochdruck-, Kraftstoffförderpumpe |
EP0933524A2 (de) * | 1998-01-30 | 1999-08-04 | Mitsubishi Denki Kabushiki Kaisha | Brennstoffhochdruckpumpe |
Also Published As
Publication number | Publication date |
---|---|
US20020015649A1 (en) | 2002-02-07 |
DE50103070D1 (de) | 2004-09-09 |
EP1160451A3 (de) | 2003-06-18 |
EP1160451B1 (de) | 2004-08-04 |
US6499974B2 (en) | 2002-12-31 |
ATE272795T1 (de) | 2004-08-15 |
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