EP0685648B1 - Kolbenanordnung für eine Kolbenpumpe - Google Patents
Kolbenanordnung für eine Kolbenpumpe Download PDFInfo
- Publication number
- EP0685648B1 EP0685648B1 EP95106563A EP95106563A EP0685648B1 EP 0685648 B1 EP0685648 B1 EP 0685648B1 EP 95106563 A EP95106563 A EP 95106563A EP 95106563 A EP95106563 A EP 95106563A EP 0685648 B1 EP0685648 B1 EP 0685648B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- arrangement according
- section
- shoe
- piston arrangement
- 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 - Lifetime
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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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
- F04B1/126—Piston shoe retaining means
Definitions
- the invention relates to a piston assembly for a Piston pump according to the preamble of claim 1.
- Piston pumps are used e.g. in high-pressure hydraulic tools, as shown for example in Fig. 3, used.
- a known piston pump shown in the middle of Fig. 3 is also referred to as a swash plate pump.
- Piston pump In such a Piston pump are several pistons 1 with their associated Cylinders 2 axially parallel arranged on a circumference.
- the Pistons 1 are at their foot-side end by means of a rotating Drive element 3 in the form of a swash plate with Driven constant angle of attack, so that the piston 1 in the respective cylinders 2 are reciprocated.
- the rotating one Drive element 3 is axially parallel to the piston 1 or cylinders 2 stored on the center of the circle on the circumference of the Variety of piston 1 and cylinders 2 are arranged.
- the rotating drive element 3 is rotated by means of a motor 7.
- Each cylinder 2 is provided with an inflow opening 6, which is opened by the reciprocation of the piston 1 and getting closed.
- a support member 8 fixed in the form of a spring plate.
- a spring 9 is arranged, which is the Piston against the rotary drive element 3 presses and thus accomplished the suction stroke of the piston 1.
- the foot of the piston 1 is designed as a hemisphere.
- a piston shoe 10th arranged between the foot of the piston 1 and the rotary drive element 3 .
- the piston shoe 10 has on the drive element. 3 facing side a substantially planar sliding surface and on his side facing the foot of the piston 1 one of the shape of the Piston foot corresponding concave cavity.
- serves the Piston shoe 10 as a bearing element between the hemisphere of Piston 1 and the rotating drive element. 3
- a radial piston pump for Hydraulic media which has a piston assembly comprising a piston movable in a cylinder.
- a piston shoe on a rotating Output element and is by means of a spring, the over a supporting element engages the piston, in the contact position biased.
- the support element has a holding element, which can be brought into engagement with the piston shoe.
- the invention is based on the object Piston arrangement for a piston pump to create at the easier at Mounting a high level of operational reliability and service life is reached.
- the method according to the independent claim 24 allows a particularly simple production of the connection between the Piston shoe and the support element for the spring.
- the pump element according to the invention is in the manner described above with reference to FIG (Axial) piston pump used.
- FIG (Axial) piston pump used The above in the description
- the reference numerals used in the prior art are in The following in the description of the preferred embodiment maintain and designate the same components.
- a pin-like piston 1 in a cylinder. 2 stored back and forth.
- a support element hereinafter spring plate 8 called
- spring plate 8 Between the spring plate 8 and a Clamping plate, which holds the cylinder 2 via a paragraph, is a compression spring 9 is arranged, which the suction stroke of the piston. 1 accomplished.
- the foot-side end of the piston 1 is provided with a Hemisphere 1a provided.
- a piston shoe 10th Between the foot end of the piston 1 and a rotating drive element 3 (in Fig. 3 in the form a swash plate shown) is a piston shoe 10th arranged.
- the piston shoe 10 serves as a bearing element between the hemisphere 1a of the piston 1 and the rotary drive element 3 (Fig.
- the spring plate 8 cup-shaped, wherein the side walls of the spring plate 8 tapered to the piston shoe 10 are formed.
- a holding element 8b in Shape of a sleeve formed with a portion of the Piston shoe 10 positively overlaps and engages with him can be brought.
- the holding element 8a thus prevents the Piston shoe 10 separates from the foot of the piston 1 or removed.
- the piston 1 consists essentially of a pin-like portion 1b, one at the foot-side end portion of the Piston disposed cylindrical portion 1c and in Direction of the piston shoe 10 trained, the rotating Drive element 3 (Fig. 3) facing hemisphere 1 a, which at the End face of the cylindrical portion 1 c is arranged.
- the cylindrical section 1c has a larger diameter than that pin-like portion 1b, so that an annular shoulder 1d between the cylindrical portion 1c and the pin-like Section 1b is formed.
- the pin-like portion 1b is in the cylinder 2 back and forth fitted.
- the hemisphere 1a has a center M, on the longitudinal axis of the piston. 1 is arranged and a radius R1.
- the spherical surface of the hemisphere 1a connects directly to the radial surface of the cylindrical Section 1c.
- the piston shoe 10 is formed substantially disc-shaped.
- the one end face or contact surface of the piston shoe 10 is facing the rotating drive element 3 and substantially is formed as a circular plane surface 10b.
- the planar surface 10b abuts against the rotary drive element (FIG. 3) and serves him as a sliding surface.
- a annular phase 10g turned on, which has a preferred phase angle of 6 °.
- the 10g phase supports the formation of a Lubricant layer between the rotary drive element. 3 ( Figure 3) and the planar surface 10b.
- the other end face of the piston shoe 10 is the foot of the piston facing.
- a concave hemispherical cavity 10a arranged, which has the radius R1. This fits the also the Radius R1 having hemisphere 1 a of the piston 1 in the cavity 10a of the piston shoe 10, so that the piston shoe 10 with respect to the Foot of the piston 1 is slidably movable or pivotable.
- the Center point M of hemispherical cavity 10a lies on the center line of the piston shoe 10.
- In the cavity 10a of the piston shoe 10th is concentric with the center line of the piston shoe 10 a kind Centering hole 10i arranged, which also serves as a bag for stocking of lubricant is used.
- annular Recess 10 f concentric with the cavity 10 a screwed.
- annular recess 10f is in the radial edge portion of another end face of the piston shoe 10 an annular projection 10e formed on the outer periphery of the other end face.
- the peripheral surface of the piston shoe 10 is in its middle Section with a trained as a return annular V-groove 10h provided.
- the piston 1 facing side surface of the Groove 10h is formed as a convex spherical surface portion 10k.
- the circumference of the spherical surface portion 10k decreases from the bottom the groove 10h starting in the direction of the other end face of the Piston shoe 10 to continuously.
- a spherical surface section 10k formed side surface of the groove 10h and the other adjacent end face of the piston shoe 10 is on Piston shoe 10 at its to the piston 1 facing section a radial expansion 10c demarcated.
- the convex spherical surface portion 10k has the radius R2, which is greater than the radius R1 of the cavity 10a and is concentric trained for this.
- the cup-shaped spring plate 8 has a hub-shaped, the Piston 1 receiving section (hereinafter inner sleeve 8a called), to which the holding element 8b is arranged concentrically.
- the inner sleeve 8a and the retaining element 8b extend from a disc-shaped base 8c towards the piston shoe 10th
- a through hole 8d of the inner sleeve 8a of the spring plate 8 has a radius greater than the radius of the pin-like section 1b of the piston 1 and smaller than the radius of the cylindrical Section 1c of the piston 1 is.
- the through hole 8d is stepwise to the piston shoe 10 toward a bore portion 8e expands, with the bore 8d an annular Paragraph 8f forms.
- the bore portion 8d has a radius that the radius of the cylindrical portion 1c of the piston. 1 equivalent.
- the spring plate 8 with the bore 8e preferably by means of a press fit on the cylindrical Section 1c of the piston 1 mounted such that the disc-shaped Base 8f in the direction of the cylinder 2 (Fig. 1).
- the paragraph 8f of the spring plate 8 is located at paragraph 1d of Piston 1 on.
- the cylinder 1 (Fig. 1) facing the front side of the spring plate 8 is formed substantially as a flat circular surface 8g.
- the circular area 8g is on its radially outer area provided with an annular recess 8h, so that between the circular surface 8g and the annular recess 8h a paragraph is trained.
- the sleeve-shaped holding element 8b extends axially towards the disc-shaped member 8c opposite direction further than the inner sleeve 8a and forms at its free end portion a annular extension 8i (dashed line) from.
- the annular Extension 8i tapers on the outer surface of the holding element 8b and is thus designed thinner than the wall remaining portion of the sleeve-shaped holding member 8b.
- the inner diameter of the sleeve-shaped retaining element 8b is in undeformed condition (dashed line) slightly larger, preferably 0.1 to 2 mm larger than that in the radial direction extending largest portion of the radial expansion 10c of the piston shoe 10.
- the sleeve-shaped holding member 8b includes the radial Expansion 10c of the piston shoe 10 in the axial direction up to a central portion of the extension 10c.
- the spring plate 8 with its bore 8 d and 8 e over pushed the pin-like portion 1 b of the piston 1, that the bore 8e on the cylindrical portion 1c of the piston 1 comes to rest and paragraph 8f of the spring plate on paragraph 1d the piston strikes, so that the spring plate 8 preferably is firmly connected by means of a press fit with the piston 1.
- the sleeve-shaped Retaining element 8b together with the annular extension 8i now includes in an overlapping manner designed as a ball section radial expansion 10c to a middle section the same.
- the thin-walled extension 8i (dashed line in Fig. 2) of the Spring plate 8 is now preferably by a rolling process in Direction of the groove 10h or in the direction of the common Center point M of the spherical surface portion 10k and the hemispherical Cavity 10a deformed so far that the inner surface of the thin-walled Extension 8i (solid line in Fig. 2) except for designed as an annular gap A preferred distance of 0.1 mm moved to the spherical surface portion 10k of the piston shoe 10 becomes.
- the sleeve-shaped holding element comprises 8b of the spring plate 8 with its extension 8i the Spherical surface section 10k in an undercut manner. Ie. the freestanding end of 8i extension is further toward Center line moved as the spring plate 8 facing Peripheral edge of the piston shoe 10th
- the piston shoe 10 is now mounted on the foot of the piston 1, that he on the one hand by the rotating drive element (Fig. 3) can perform pivotal movements and on the other hand only so far from the piston 1 can be lifted until the formed as a spherical surface portion 10c radial expansion the rolled thin-walled extension 8i (solid line in FIG. 2) touched.
- the spring plate 8 and the piston shoe 10 is the full mobility of the piston shoe 10 on the hemispherical Guaranteed surface 1a of the piston 1.
- At maximum Inclination of the piston shoe 10 with respect to the hemisphere 1a of Piston 1 is the piston shoe 10 facing portion of Inner sleeve 8a (or the collar of the bore 8e) of the spring plate. 8 from the annular recess portion 10f of the piston shoe 10th recorded, without causing a collision between the piston shoe 10 and spring plate 8 can come.
- the inventive compound of the piston shoe 10 with the Spring plate 8 allows pre-assembly of these components with the Piston 1, since these form-fitting manner with each other after the rolling process are connected.
- the production of the piston pump 1 can thus much cheaper than using conventional Pump elements take place, in which the assembly of the piston assembly can be done in the cylinder or the piston assembly must be held together by means of aids (clamps).
- the spring 9 is now on the annular recess 8h of the spring plate 8 is placed and the pin-like portion 1 b of the piston 1 in the cylinder first introduced and this so fixed in a pump plate, so that the piston 1 with the tension of the spring 9 against the Swash plate 3 (see Fig. 3) is pressed.
- the pump element described above has been designed for use in an axial piston pump described as a rotating Drive element 3 a swash plate with a constant angle of attack Has.
- the pump element is also for use in a Swash plate pump provided in the as a rotating drive element 3 inserted a disc with adjustable inclination angle becomes.
- this pump element is also for use in a Radial piston pump used as a rotating drive element has an eccentric shaft or an eccentric ring. there slides the piston shoe either on the outer surface of a eccentrically arranged shaft or on the inner surface of a eccentrically arranged rings.
- this pump element is also for use in a Angular axis pump suitable, in which the axes of the piston or Cylinder opposite the rotating disc in an adjustable manner are arranged.
- the surface 10b of the piston shoe may be used as appropriate or the requirements except plan also concave or convex and be designed spherical or cylindrical.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
- Compressor (AREA)
Description
Claims (23)
- Kolbenanordnung für eine Kolbenpumpe mit einem rotierenden Antriebselement und zumindest einem in einem Zylinder (2) bewegbaren Kolben (1), der über einen Kolbenschuh (10) an dem rotierenden Antriebselement (3) anliegt und der mittels einer Feder (9), die über ein Stützelement (8) am Kolben (1) angreift, in die Anlagestellung vorgespannt ist, wobei das Stützelement (8) ein Halteelement (8b) hat, das mit dem Kolbenschuh (10) in Eingriff bringbar ist,
dadurch gekennzeichnet, dass
das Halteelement (8b) als eine am Stützelement (8) angeordnete Hülse ausgebildet ist, die einen konvexen Kugelflächenabschnitt (10k) des Kolbenschuhs (10) überlappend umfasst, wobei das hülsenförmige Halteelement (8b) an seinem freien, zum Kolbenschuh (10) hin gerichteten Endabschnitt als eine sich verjüngende ringförmige dünnwandige Verlängerung (8i) ausgebildet ist. - Kolbenanordnung nach Anspruch 1, dadurch gekennzeichnet, dass das Halteelement (8b) einen dem Stützelement (8) zugewandten Abschnitt des Kolbenschuhs (10) umfasst.
- Kolbenanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass am Umfang des Kolbenschuhs (10) zumindest ein Rücksprung ausgebildet ist, in den das Halteelement (8b) einrastbar ist.
- Kolbenanordnung nach Anspruch 3, dadurch gekennzeichnet, dass der Rücksprung eine ringförmige V-Nut (10h) ist.
- Kolbenanordnung nach Anspruch 4, dadurch gekennzeichnet, dass der Umfang des Kugelflächenabschnitts (10k) vom Grund der Nut (10h) ausgehend in Richtung zum Stützelement (8) kontinuierlich bis zu seiner dem Stützelement (8) zugewandten Stirnseite zunimmt.
- Kolbenanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die ringförmige dünnwandige Verlängerung (8i) in Richtung zum Kugelflächenabschnitt (10k) bzw. in Richtung zur Seitenfläche der Nut (10h) verformbar ist, so dass das Halteelement (8b) den Kugelflächenabschnitt (10k) hinterschneidend umfasst.
- Kolbenanordnung nach Anspruch 6, dadurch gekennzeichnet, dass zwischen der dünnwandigen Verlängerung (8i) und dem Kugelflächenabschnitt (10k) ein Ringspalt A ausgebildet wird, der eine bevorzugte Spaltbreite von 0,1 mm hat.
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das fußseitige Ende des Kolbens (1) als konvexe Halbkugel (1a) ausgebildet ist.
- Kolbenanordnung nach Anspruch 8, dadurch gekennzeichnet, dass der Kolbenschuh (10) auf der dem Kolben (1) zugewandten Seite mit einer konkaven kugeligen Höhlung (10a) versehen ist, die mit der Halbkugel (1a) zusammenpasst und ein Gleitlager ausbildet.
- Kolbenanordnung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Halbkugel (1a), die kugelige Höhlung (10a) und der konvexe Kugelflächenabschnitt (10k) den gleichen Mittelpunkt (M) haben.
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die die am rotierenden Antriebselement (3) anliegende Fläche (10b) des Kolbenschuhs (10) als plane Fläche ausgebildet ist, wobei der Randabschnitt der Fläche (10b) mit einer Phase (10g) versehen ist.
- Kolbenanordnung nach Anspruch 11, dadurch gekennzeichnet, dass die Fläche (10b) konvex-ballig, konvex-kugelig oder konvex-zylindrisch ausgebildet ist.
- Kolbenanordnung nach Anspruch 11, dadurch gekennzeichnet, dass die Fläche (10b) konkav-ballig, konkav-kugelig oder konkav-zylindrisch ausgebildet ist.
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Stützelement (8) auf seiner dem Zylinder (2) zugewandten Seite eine ringförmige Aussparung (8h) hat, an der sich die Feder (9) abstützt.
- Kolbenanordnung nach Anspruch 8, dadurch gekennzeichnet, dass der Kolben (1) im Anschluss an die Halbkugel (1a) einen zylindrischen Abschnitt (1c) und daran anschließend einen stiftartigen Abschnitt (1b) hat, wobei der Durchmesser des zylindrischen Abschnitts (1c) größer ist als der Durchmesser des stiftartigen Abschnitts (1b).
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Stützelement (8) eine mittige Bohrung (8d) hat, die auf der dem Kolbenschuh (10) zugewandten Seite auf einen Abschnitt mit größerem Durchmesser (8e) erweitert ist.
- Kolbenanordnung nach Anspruch 15 oder 16, dadurch gekennzeichnet, dass das Stützelement (8) mit dem Abschnitt mit größerem Durchmesser (8e) mittels einer Presspassung mit dem zylindrischen Abschnitt (1c) des Kolbens (1) verbunden ist.
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass im Innenbereich des Stützelements (8) auf der dem Kolbenschuh (10) zugewandten Seite eines ringförmige Aussparung (8k) ausgebildet ist.
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Kolbenschuh (10) auf der dem Stützelement (8) zugewandten Seite konzentrisch zur kugeligen Höhlung (10a) einen ringförmigen Aussparungsabschnitt (10f) hat, wodurch auf der Außenfläche (10c) ein ringförmiger Verlängerungsabschnitt (10e) am Kolbenschuh (10) ausgebildet ist.
- Kolbenanordnung nach Anspruch 18 oder 19, dadurch gekennzeichnet, dass bei einer Schwenkbewegung des Kolbenschuhs (10) gegenüber dem Kolben (1) der Bund der Bohrung (8e) vom ringförmigen Aussparungsabschnitt (10f), der Verlängerungsabschnitt (10e) von der ringförmigen Aussparung (8k) und die am Stützelement (8) ausgebildete Verlängerung (8i) von der Nut (10h) des Kolbenschuhs (10) aufgenommen wird.
- Kolbenanordnung nach Anspruch 20, dadurch gekennzeichnet, dass der Bund des Abschnitts mit größerem Durchmesser (8e) gegen die Begrenzungsfläche des ringförmigen Aussparungsabschnitts (10f) anschlagbar ist, um die Schwenkbewegung des Kolbenschuhs (10) zu begrenzen.
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass als Antriebselement (3) die Scheibe einer Axialkolbenpumpe mit konstantem oder mit verstellbarem Neigungswinkel verwendbar ist.
- Kolbenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass als Antriebselement (3) die Außenfläche einer exzentrisch gelagerten Welle oder die Innenfläche eines exzentrisch gelagerten Rings einer Radialkolbenpumpe verwendbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4416192 | 1994-05-06 | ||
DE4416192A DE4416192C2 (de) | 1994-05-06 | 1994-05-06 | Kolbenanordnung für eine Kolbenpumpe |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0685648A2 EP0685648A2 (de) | 1995-12-06 |
EP0685648A3 EP0685648A3 (de) | 1997-11-26 |
EP0685648B1 true EP0685648B1 (de) | 2005-07-27 |
Family
ID=6517583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95106563A Expired - Lifetime EP0685648B1 (de) | 1994-05-06 | 1995-05-02 | Kolbenanordnung für eine Kolbenpumpe |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0685648B1 (de) |
AT (1) | ATE300674T1 (de) |
DE (2) | DE4416192C2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19858862A1 (de) * | 1998-12-19 | 2000-03-02 | Bosch Gmbh Robert | Radialkolbenpumpe |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB533596A (en) * | 1939-10-10 | 1941-02-17 | Raymond Leslie Kent | Improvements relating to reciprocating pumps |
FR1126864A (fr) * | 1954-07-09 | 1956-12-03 | Stempel Hermetik Gmbh | Compresseur à piston, en particulier pour petites machines frigorifiques hermétiquement cuirassées |
FR1580807A (de) * | 1967-06-07 | 1969-09-12 | ||
DE3406782A1 (de) * | 1983-02-25 | 1984-08-30 | Linde Ag, 6200 Wiesbaden | Kolben fuer eine hydrostatische maschine |
DE3424862C1 (de) * | 1984-07-06 | 1985-07-25 | Hauhinco Maschinenfabrik G. Hausherr, Jochums Gmbh & Co Kg, 4300 Essen | Radialkolbenpumpe fuer hydraulische Medien |
DE3505176C1 (de) * | 1985-02-15 | 1986-04-24 | Hauhinco Maschinenfabrik G. Hausherr, Jochums Gmbh & Co Kg, 4300 Essen | Radialkolbenpumpe für hydraulische Medien |
DE3804424C1 (en) * | 1988-02-12 | 1989-08-24 | Hydromatik Gmbh, 7915 Elchingen, De | Piston for axial-piston machines |
ATE110443T1 (de) * | 1991-05-07 | 1994-09-15 | Hauhinco Maschf | Hochdruckwasserpumpe für reinwasser. |
-
1994
- 1994-05-06 DE DE4416192A patent/DE4416192C2/de not_active Expired - Fee Related
-
1995
- 1995-05-02 DE DE59511011T patent/DE59511011D1/de not_active Expired - Fee Related
- 1995-05-02 EP EP95106563A patent/EP0685648B1/de not_active Expired - Lifetime
- 1995-05-02 AT AT95106563T patent/ATE300674T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0685648A3 (de) | 1997-11-26 |
DE4416192A1 (de) | 1995-11-09 |
ATE300674T1 (de) | 2005-08-15 |
DE59511011D1 (de) | 2005-09-01 |
DE4416192C2 (de) | 1997-02-20 |
EP0685648A2 (de) | 1995-12-06 |
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