EP0888499B1 - Kolben für eine hydrostatische axialkolbenmaschine - Google Patents
Kolben für eine hydrostatische axialkolbenmaschine Download PDFInfo
- Publication number
- EP0888499B1 EP0888499B1 EP97905034A EP97905034A EP0888499B1 EP 0888499 B1 EP0888499 B1 EP 0888499B1 EP 97905034 A EP97905034 A EP 97905034A EP 97905034 A EP97905034 A EP 97905034A EP 0888499 B1 EP0888499 B1 EP 0888499B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- curvature
- bevel
- skirt surface
- radius
- 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
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
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0469—Other heavy metals
- F05C2201/0475—Copper or alloys thereof
- F05C2201/0478—Bronze (Cu/Sn alloy)
Definitions
- the invention relates to a piston for a hydrostatic axial piston machine, arranged in particular in a swashplate design with a cylinder drum axial cylinder bores and a swash plate on which the pistons are supported.
- the Pistons consist of a piston skirt with a piston face and with an in the cylindrical bore reciprocating cylindrical surface and one piston head supporting the swash plate.
- Such pistons for axial piston machines are known for example from DE A 23 20 554 and DE-A 36 09 892. At least the end regions of the cylindrical outer surface facing the end pressure surface of these pistons are chamfered or rounded off for a variety of reasons. It is known to the person skilled in the art that in such machines the piston play and the kinematics of such machines inevitably lead to an alternating inclination of the piston in the cylinder bore, which causes increased friction and wear, particularly in the case of soft cylinder material, for example bronze. During the piston movement, a scraping effect occurs on the wall of the cylinder bore through the end edges of the piston / outer surface.
- the invention has for its object a piston for a hydrostatic To create an axial piston machine in which the wear at the insertion and removal point the piston skirt is further reduced and at the same time the hydraulic-mechanical and volumetric efficiency of the hydrostatic machine is improved.
- the piston is according to the preamble of claim 1 characterized in that the outer surface of the piston skirt on its in the Piston front end merging front end area and / or their towards the piston head a rear bevel with a constantly changing radius of curvature having.
- This is not only a reduction in the friction at the piston ends thereby achieved that the chamfer profile the different sized inclinations of the Piston is adapted in its back and forth movement in the cylinder bore, but a lower tolerance for the permissible piston play can also be assumed become.
- the invention enables a better lubricating film build-up for removing the Frictional heat of the cylinder bore wall. After all, it's a surprising one Improvement of hydraulic-mechanical and volumetric efficiency, were measured up to 3%, achieved in that the chamfer profile the effective face pressure area of the piston enlarged.
- the axial piston machine shown schematically in section in FIG Swashplate design consists of a housing 1, the input / output shaft 2, the Cylinder drum 3, the housing cover 4 with control disc 5, the swash plate 6, the Pistons 7, which move in cylinder bores 8 of the cylinder drum 3 in that they are supported by sliding shoes 9 on the swash plate 6.
- the inclination of the Swash plate 6 can by an adjusting device 10 and thus the stroke volume of the Machine can be changed.
- this axial piston machine is of the usual type and there is no need for a more detailed description.
- the pistons 7, in the embodiment shown hollow pistons, consist of a Piston shaft 15 with a pressure-sensitive piston face 11.
- the piston shaft 15 has one cylindrical outer surface 12 which slides on the wall 13 of the cylinder bore 8.
- On the side facing away from the piston face 11 goes into the piston head 14 over, which is mounted in the shoe 9.
- To illustrate the kinematics in the Figure 2 shows the inclination of the pistons 7 in the cylinder bores 8 greatly exaggerated shown.
- the decisive points for the emergence of the scraping effect are the end areas of the Piston skirt.
- the front end portion of the piston skirt 15, in which the Piston shaft 15 merges into the piston end face 11 is designated Y and for Embodiments in Figures 4 and 6 shown enlarged.
- the rear end area of the piston skirt 15 is designated X and for the two embodiments in the Figures 5 and 7 are shown enlarged.
- the chamfer profile 16 begins at the piston face 11 with a small one Radius of curvature R1 and continues with increasing radii of curvature to the lateral surface 12, in which the radius of curvature R2 reaches infinite size.
- the chamfer profile 16 tapers into the lateral surface, becoming ever flatter.
- the between the piston face 11 and the beginning of the chamfer profile 16 with a small Radius of curvature R1 resulting edge 17 is functionally meaningless since this edge in no inclined position of the piston in the area of the wall of the cylinder bore comes. Generally, this edge 17 is so far inward of the piston center axis laid, i.e.
- the chamfer profile 16 is so large that it is also used as an introductory phase Assembly of the pistons to avoid damage to the cylinder bore wall serves.
- the chamfer profile 18 in the rear end region of the piston skirt 15 according to FIG. 5 starts from the side of the piston head 14 with a small radius of curvature R3, runs with continuously increasing radii of curvature into the outer surface 12 of the piston, where it reaches the radius of curvature R2 of infinite size of the lateral surface.
- the chamfer profile 19 has on the side of the Piston face 11 initially again has a small radius R4, which remains constant or increasing continuously changes into a large radius of curvature R5.
- This Radius of curvature R5 can also be infinitely large, which means that in this area a conical annular chamfer pressure surface 20 is formed.
- Radius of curvature R6 continues, the radii of curvature R7 etc. again increasing continuously until they have the radius of curvature R2 with the value infinite of the lateral surface 12 reach the piston, so that the chamfer profile 19 here also continuously and flat in the lateral surface 12 merges.
- the conical annular pressure surface 20 increases the hydraulic-volumetric efficiency of the piston.
- the angle between one axial surface line of the pressure surface 20 and an axial surface line of the surface surface 12 of the piston should be less than 5 °.
Description
Es wurde festgestellt, daß diese Kanten der Anfasung oder auch mit gleichem, kleinem Krümmungsradius gebrochene Kanten die genannte Schabwirkung nicht vermeiden. Diese Schabwirkung verhindert den Aufbau des zur Abführung der Reibungswärme benötigten Leckölschmierfilmes und neigt zum Verklemmen der Kolben in der Zylinderbohrung (Schubladeneffekt).
Claims (6)
- Kolben für eine hydrostatische Axialkolbenmaschine, insbesondere in Schrägscheibenbauform mit einer Zylindertrommel (3), darin angeordneter axialer Zylinderbohrungen (8) und einer Schrägscheibe (6), an der die in den Zylinderbohrungen hin- und herbeweglichen Kolben (7) abgestützt sind, bestehend aus einem Kolbenschaft (15) mit einer Kolbenstirnfläche und mit einer in der Zylinderbohrung anliegenden zylindrischen Mantelfläche (12) sowie einem sich an der Schrägscheibe (6) abstützenden Kolbenkopf (14),
dadurch gekennzeichnet, daß die Mantelfläche (12) des Kolbenschaftes (15) an ihrem in die Kolbenstirnseite (11) übergehenden vorderen Endbereich (Y) und/oder ihrem zum Kolbenkopf hin liegenden hinteren Endbereich (X) eine Anfasung (16; 18; 19; 21) mit stetig veränderten Krümmungsradien aufweist. - Kolben nach Anspruch 1,
dadurch gekennzeichnet, daß die Anfasung (16; 18; 19; 21) der Mantelfläche von dem Kolbenschaftende beginnend mit einem kleinen Krümmungsradius und anschließend größer werdenden Krümmungsradien in die zylindrische Mantelfläche (12) mit dem Radius unendlich ausläuft. - Kolben nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die stetige Änderung der Krümmungsradien derart gewählt ist, daß ein zumindest annähernd logarithmisch verlaufendes Anfasungs-Profil (16; 18) an den Endbereichen der Mantelfläche (12) gegeben ist. - Kolben nach Anspruch 1,
dadurch gekennzeichnet, daß die Anfasung (19; 21) der Mantelfläche von dem Kolbenschaftende mit einem kleinen Krümmungsradius (R4; R8) beginnt, sich mit einem großen, vorzugsweise unendlich großen Krümmungsradius (R5; R9) unter Bildung einer konisch ringförmigen Anfasungs-Druckfläche (20) fortsetzt und anschließend mit wieder kleinerem (R6) und dann größer werdenden Krümmungsradien (R7) in die zylindrische Mantelfläche mit unendlichem Krümmungsradius (R2) übergeht. - Kolben nach Anspruch 4,
dadurch gekennzeichnet, daß der Winkel der Konizität der Anfasungs-Druckfläche (20) zu der zylindrischen Mantelfläche (12) kleiner als 5° ist. - Kolben nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß das Anfasungs-Profil an dem vorderen Endbereich und an dem hinteren Endbereich der Mantelfläche des Kolbenschaftes unterschiedlich ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19610595 | 1996-03-18 | ||
DE19610595A DE19610595C1 (de) | 1996-03-18 | 1996-03-18 | Kolben für eine hydrostatische Axialkolbenmaschine |
PCT/EP1997/000742 WO1997035110A1 (de) | 1996-03-18 | 1997-02-17 | Kolben für eine hydrostatische axialkolbenmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0888499A1 EP0888499A1 (de) | 1999-01-07 |
EP0888499B1 true EP0888499B1 (de) | 2002-06-05 |
Family
ID=7788634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97905034A Expired - Lifetime EP0888499B1 (de) | 1996-03-18 | 1997-02-17 | Kolben für eine hydrostatische axialkolbenmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US5970845A (de) |
EP (1) | EP0888499B1 (de) |
JP (1) | JP2000506585A (de) |
KR (1) | KR100382835B1 (de) |
DE (2) | DE19610595C1 (de) |
WO (1) | WO1997035110A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6575080B1 (en) * | 1999-09-24 | 2003-06-10 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Single-headed piston for swash plate type compressor wherein head portion has a curved surface at axial end |
DE10045281C1 (de) * | 2000-09-13 | 2002-05-23 | Orange Gmbh | Hochdruckpumpe |
US6732633B1 (en) * | 2003-01-14 | 2004-05-11 | Sauer-Danfoss Inc. | Reduced dead volume hollow piston |
DE10312242B3 (de) * | 2003-03-19 | 2004-12-02 | Brueninghaus Hydromatik Gmbh | Druckstift und Axialkolbenmaschinen mit diesem Druckstift |
JP4828371B2 (ja) * | 2006-10-23 | 2011-11-30 | ボッシュ・レックスロス株式会社 | アキシャルピストンポンプ・モータ |
DE102006052430A1 (de) * | 2006-11-07 | 2008-05-08 | BSH Bosch und Siemens Hausgeräte GmbH | Verdichter mit gasdruckgelagertem Kolben |
JP5492917B2 (ja) * | 2012-02-01 | 2014-05-14 | 株式会社豊田自動織機 | 可変容量型斜板式圧縮機 |
JP6170330B2 (ja) * | 2013-04-16 | 2017-07-26 | 川崎重工業株式会社 | アキシャルピストンポンプモータのピストン、アキシャルピストンポンプモータのシリンダブロックおよびアキシャルピストンポンプモータ |
KR102151119B1 (ko) * | 2014-02-13 | 2020-09-02 | 주식회사 두산 | 유압모터 또는 유압펌프의 피스톤 |
DE102016104238A1 (de) * | 2016-03-09 | 2017-09-14 | L'orange Gmbh | Pumpenkolben in einer Hochdruckpumpe |
DE102017210857A1 (de) | 2017-06-28 | 2019-01-03 | Robert Bosch Gmbh | Hydrostatische Verdrängermaschine, Kolben für die hydrostatische Verdrängermaschine, sowie Zylindertrommel für die hydrostatische Verdrängermaschine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3741077A (en) * | 1972-04-24 | 1973-06-26 | Eaton Corp | Piston assembly |
US4776260A (en) * | 1980-11-07 | 1988-10-11 | Vincze Alexander L | Constant pressure pump |
DE3609892A1 (de) * | 1985-03-26 | 1986-10-09 | Linde Ag, 6200 Wiesbaden | Hohlkolben fuer eine hydrostatische kolbenmaschine und verfahren zu dessen herstellung |
GB2239304B (en) * | 1989-12-22 | 1994-06-01 | Jaguar Cars | Torque transfer or reacting mechanism |
-
1996
- 1996-03-18 DE DE19610595A patent/DE19610595C1/de not_active Expired - Fee Related
-
1997
- 1997-02-17 EP EP97905034A patent/EP0888499B1/de not_active Expired - Lifetime
- 1997-02-17 US US09/066,409 patent/US5970845A/en not_active Expired - Lifetime
- 1997-02-17 WO PCT/EP1997/000742 patent/WO1997035110A1/de active IP Right Grant
- 1997-02-17 DE DE59707424T patent/DE59707424D1/de not_active Expired - Lifetime
- 1997-02-17 KR KR10-1998-0704564A patent/KR100382835B1/ko not_active IP Right Cessation
- 1997-02-17 JP JP9533069A patent/JP2000506585A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
KR20000064432A (ko) | 2000-11-06 |
KR100382835B1 (ko) | 2003-07-16 |
JP2000506585A (ja) | 2000-05-30 |
DE19610595C1 (de) | 1996-10-10 |
EP0888499A1 (de) | 1999-01-07 |
DE59707424D1 (de) | 2002-07-11 |
WO1997035110A1 (de) | 1997-09-25 |
US5970845A (en) | 1999-10-26 |
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