EP1898088B1 - Muffled and/or silenced axial piston engine - Google Patents

Muffled and/or silenced axial piston engine Download PDF

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Publication number
EP1898088B1
EP1898088B1 EP20070112283 EP07112283A EP1898088B1 EP 1898088 B1 EP1898088 B1 EP 1898088B1 EP 20070112283 EP20070112283 EP 20070112283 EP 07112283 A EP07112283 A EP 07112283A EP 1898088 B1 EP1898088 B1 EP 1898088B1
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EP
European Patent Office
Prior art keywords
axial piston
elastomer layer
piston engine
swashplate
bearing
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.)
Not-in-force
Application number
EP20070112283
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German (de)
French (fr)
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EP1898088A3 (en
EP1898088A2 (en
Inventor
Martin Cichon
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1898088A2 publication Critical patent/EP1898088A2/en
Publication of EP1898088A3 publication Critical patent/EP1898088A3/en
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Publication of EP1898088B1 publication Critical patent/EP1898088B1/en
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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
    • F04B1/20—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 having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2078—Swash plates
    • 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
    • F04B1/20—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 having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2078—Swash plates
    • F04B1/2085—Bearings for swash plates or driving axles
    • 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
    • F04B53/001—Noise damping

Definitions

  • the invention relates to an axial piston machine according to the preamble of claim 1.
  • Such axial piston machine in which the swash plate is formed as a pivoting cradle is from the US 4508011 known.
  • the invention has for its object to provide an axial piston machine with reduced noise.
  • the elastomer layer a lower modulus of elasticity and / or a lower density than the adjacent to them metallic components of the swash plate.
  • an impedance jump is realized at the interface between a metallic component of the swash plate and the adjacent elastomer layer, which reflects the structure-borne sound waves.
  • the greater this impedance jump the greater the proportion of reflected structure-borne sound waves, resulting in improved noise reduction.
  • a higher material damping property of the elastomer results in the dissipation of vibrational energy in the form of heat. Accordingly, the damping is improved with increasing damping property of the elastomer.
  • the individual components of the swash plate rest not only on the elastomer layer, but that they are held together by the elastomer layer.
  • no further connecting means such as grooves, screws, etc. are provided except the elastomer layer, whereby sound bridges are avoided.
  • Elastomer material is preferably introduced between the components in the manufacture of the swash plate, whereupon the metal components together with the Elastomer layer, in particular made of rubber or with a rubber portion vulcanized.
  • the elastomer layer is arranged parallel to the sliding surface of the swash plate, the swash plate thus has at least two components facing each other parallel surfaces, between which the elastomer layer is arranged.
  • the flow rate of the axial piston machine is variable, is provided in an embodiment of the invention advantageously that the swash plate is pivotally mounted within the housing, that is designed as a pivoting cradle.
  • the elastomer layer is preferably arranged in the region of the bearing of the pivoting cradle.
  • one or more elastomer layers can be arranged within the swash plate, preferably parallel to the sliding surface.
  • One way to integrate the elastomer layer into the bearing is to place the elastomer layer between a bearing shell of the bearing and the housing and / or between a bearing shell and the swashplate, so that the structure-borne sound waves must pass through the elastomer layer on its way to the housing.
  • the bearing shell is made of a low-wear material, in particular bronze, so that a sliding pair of bronze and steel is formed.
  • the bearing can also be designed as a rolling bearing, wherein the rolling bearing is buffered with respect to the housing and / or against the swash plate via at least one elastomer layer.
  • the elastomer layer is not formed in one layer or in one piece, but consists of several, preferably different, in particular interconnected, material layers. As a result, further impedance jumps can be realized within the elastomer layer.
  • Fig. 1 is an axial piston machine 1 with a swivel plate designed as a pivoting or pivotally mounted swash plate 2 shown.
  • the axial piston machine 1 has a housing 3 in which a shaft 4 is rotatably supported by means of two roller bearings 5, 6 spaced apart in the axial direction.
  • the shaft 4 is rotatably connected to a cylinder body 7, wherein within the cylinder body 7 distributed over the circumference of the cylinder body 8 in the axial direction parallel to the shaft 4 movable piston 9 are arranged.
  • the pistons 9 rotate together with the shaft 4 and the cylinder body 7 in the circumferential direction and are supported by sliding shoes 10 on the sliding surface 11 of the swash plate 2 from.
  • the cylinder body 7 is sprung against a control plate 13, in which a suction kidney 14 and a pressure kidney 15 are introduced.
  • the control plate 13 rests with the right side in the drawing plane on a connection plate 16 in such a way that the suction kidney 14 at a suction port 17 and the pressure kidney 15 at a pressure port 18 are.
  • the pistons 9 perform periodic movements in the axial direction parallel to the shaft 4, wherein in the direction of movement of the control plate 13, the fluid is sucked from the suction kidney 14, wherein the fluid is conveyed in the opposite direction of pressure in the print kidney 15.
  • swash plate 2 In the illustration according to Fig. 1 the swash plate 2 is shown in a slanted position, whereas the swash plate 2 in Fig. 2 a non-inclined, that is arranged orthogonal to the shaft 4 position. If the shaft 4 is set in rotation in the latter position of the swash plate 2, the pistons 9 do not move axially, but only in the circumferential direction and there is no fluid delivery, but the pistons when passing the pressure kidney or suction kidney alternately with delivery pressure or suction pressure applied.
  • the swash plate 2 is formed from three parallel components 19, 20, 21, wherein the sliding surface 11 is formed by the component 19 made of metal.
  • Component 21 forms a main body of the swash plate 2
  • component 20 is designed as an intermediate layer between the component 19 and component 21 (see. Fig. 3 ).
  • an elastomer layer 22, 23 is arranged in each case, wherein the components 19, 20, 21 are held together exclusively by the elastomer layers 22, 23.
  • the elastomer layers 22, 23 have a lower modulus of elasticity and a lower density than the components 19, 20, 21 made of metal, in particular made of steel, so that at the boundary surfaces 24, 25 between the component 19 and the elastomer layer 22 and between the component 20 and the elastomer layer 23 an impedance jump is realized, due to which the structure-borne sound waves are reflected back in the direction of the piston 9. Due to the damping property of the elastomer material, there is simultaneously a dissipation of the vibration energy in the form of heat.
  • the bearing shell 26 of the bearing 27 designed as a slide bearing is connected to the housing 3 via an elastomer layer 28 for the pivotable mounting of the swashplate 2. This results in a plurality of spaced locations of the swash plate 2, both a vibration damping and a vibration isolation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Details Of Reciprocating Pumps (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Axialkolbenmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an axial piston machine according to the preamble of claim 1.

Eine derartige Axialkolbenmaschine, bei der die Schrägscheibe als Schwenkwiege ausgebildet ist, ist aus der US 4508011 bekannt.Such axial piston machine in which the swash plate is formed as a pivoting cradle, is from the US 4508011 known.

Der Erfindung liegt die Aufgabe zugrunde, eine Axialkolbenmaschine mit reduzierter Geräuschentwicklung vorzuschlagen.The invention has for its object to provide an axial piston machine with reduced noise.

Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous developments of the invention are specified in the subclaims.

Gemäß einer vorteilhaften Ausgestaltungsform der Erfindung ist mit Vorteil vorgesehen, dass die Elastomerschicht ein geringeres Elastizitätsmodul und/oder eine geringere Dichte aufweist als die an sie angrenzenden metallischen Bauteile der Schrägscheibe. Hierdurch wird an der Grenzfläche zwischen einem metallischen Bauteil der Schrägscheibe und der angrenzenden Elastomerschicht ein Impedanzsprung realisiert, der die Körperschallwellen reflektiert. Je größer dieser Impedanzsprung ist, desto größer ist der Anteil der reflektierten Körperschallwellen, was in einer verbesserten Geräuschreduzierung resultiert. Eine höhere Materialdämpfungseigenschaft des Elastomers führt zur Dissipation von Schwingungsenergie in Form von Wärme. Demnach wird die Dämpfung mit zunehmender Dämpfungseigenschaft des Elastomers verbessert.According to an advantageous embodiment of the invention is advantageously provided that the elastomer layer a lower modulus of elasticity and / or a lower density than the adjacent to them metallic components of the swash plate. As a result, an impedance jump is realized at the interface between a metallic component of the swash plate and the adjacent elastomer layer, which reflects the structure-borne sound waves. The greater this impedance jump, the greater the proportion of reflected structure-borne sound waves, resulting in improved noise reduction. A higher material damping property of the elastomer results in the dissipation of vibrational energy in the form of heat. Accordingly, the damping is improved with increasing damping property of the elastomer.

In Weiterbildung der Erfindung ist mit Vorteil vorgesehen, dass die einzelnen Bauteile der Schrägscheibe nicht nur auf der Elastomerschicht aufliegen, sondern dass diese von der Elastomerschicht zusammengehalten werden. Bevorzugt sind außer der Elastomerschicht keine weiteren Verbindungsmittel wie Nuten, Schrauben, etc. vorgesehen, wodurch Schallbrücken vermieden werden. Bevorzugt wird bei der Herstellung der Schrägscheibe Elastomermaterial zwischen die Bauteile eingebracht, woraufhin die Metallbauteile zusammen mit der Elastomerschicht, insbesondere aus Kautschuk oder mit einem Kautschukanteil, vulkanisiert werden.In a further development of the invention is advantageously provided that the individual components of the swash plate rest not only on the elastomer layer, but that they are held together by the elastomer layer. Preferably, no further connecting means such as grooves, screws, etc. are provided except the elastomer layer, whereby sound bridges are avoided. Elastomer material is preferably introduced between the components in the manufacture of the swash plate, whereupon the metal components together with the Elastomer layer, in particular made of rubber or with a rubber portion vulcanized.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist mit Vorteil vorgesehen, dass die Elastomerschicht parallel zur Gleitoberfläche der Schrägscheibe angeordnet ist, die Schrägscheibe also mindestens zwei Bauteile mit einander zugewandten Parallelflächen aufweist, zwischen denen die Elastomerschicht angeordnet ist.According to a preferred embodiment of the invention is advantageously provided that the elastomer layer is arranged parallel to the sliding surface of the swash plate, the swash plate thus has at least two components facing each other parallel surfaces, between which the elastomer layer is arranged.

Damit die Förderleistung der Axialkolbenmaschine variierbar ist, ist in Ausgestaltung der Erfindung mit Vorteil vorgesehen, dass die Schrägscheibe verschwenkbar innerhalb des Gehäuses gelagert, also als Schwenkwiege ausgebildet ist. Zur Minimierung der Körperschallweiterleitung an das Gehäuse ist die Elastomerschicht bevorzugt im Bereich des Lagers der Schwenkwiege angeordnet. Selbstverständlich kann zusätzlich oder alternativ zur gedämpften Lagerung des Lagers eine oder mehrere Elastomerschichten innerhalb der Schrägscheibe, bevorzugt parallel zur Gleitoberfläche angeordnet werden.Thus, the flow rate of the axial piston machine is variable, is provided in an embodiment of the invention advantageously that the swash plate is pivotally mounted within the housing, that is designed as a pivoting cradle. To minimize the structure-borne sound transmission to the housing, the elastomer layer is preferably arranged in the region of the bearing of the pivoting cradle. Of course, additionally or alternatively to the damped mounting of the bearing, one or more elastomer layers can be arranged within the swash plate, preferably parallel to the sliding surface.

Eine Möglichkeit zur Integration der Elastomerschicht in das Lager besteht darin, zwischen einer Lagerschale des Lagers und dem Gehäuse und/oder zwischen eine Lagerschale und der Schrägscheibe die Elastomerschicht anzuordnen, so dass die Körperschallwellen die Elastomerschicht auf ihrem Weg zum Gehäuse passieren müssen. Insbesondere bei der Ausbildung des Lagers als Gleitlager ist es von Vorteil, wenn die Lagerschale aus einem verschleißarmen Material, insbesondere aus Bronze ausgebildet ist, so dass eine Gleitpaarung aus Bronze und Stahl gebildet ist.One way to integrate the elastomer layer into the bearing is to place the elastomer layer between a bearing shell of the bearing and the housing and / or between a bearing shell and the swashplate, so that the structure-borne sound waves must pass through the elastomer layer on its way to the housing. In particular, in the formation of the bearing as a plain bearing, it is advantageous if the bearing shell is made of a low-wear material, in particular bronze, so that a sliding pair of bronze and steel is formed.

Alternativ kann das Lager auch als Wälzlager ausgeführt werden, wobei das Wälzlager gegenüber dem Gehäuse und/oder gegenüber der Schrägscheibe über mindestens eine Elastomerschicht abgepuffert ist.Alternatively, the bearing can also be designed as a rolling bearing, wherein the rolling bearing is buffered with respect to the housing and / or against the swash plate via at least one elastomer layer.

Gemäß einer Weiterbildung der Erfindung ist mit Vorteil vorgesehen, dass die Elastomerschicht nicht einlagig oder einstückig ausgebildet ist, sondern aus mehreren, vorzugsweise unterschiedlichen, insbesondere miteinander verbundenen, Materiallagen besteht. Hierdurch können weitere Impedanzsprünge innerhalb der Elastomerschicht realisiert werden.According to one embodiment of the invention is advantageously provided that the elastomer layer is not formed in one layer or in one piece, but consists of several, preferably different, in particular interconnected, material layers. As a result, further impedance jumps can be realized within the elastomer layer.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Vorteile und zweckmäßige Ausführungen der Erfindung sind in den weiteren Ansprüchen, der Figurenbeschreibung und den Figuren erläutert.Further advantages and expedient embodiments of the invention are explained in the further claims, the description of the figures and the figures.

Es zeigen:

Fig. 1:
eine schematische geschnittene Darstellung einer Axialkolbenmaschine mit einer als Schwenkwiege ausgebildeten Schrägscheibe,
Fig. 2:
eine um 90° gedrehte Ansicht von Fig. 1,
Fig. 3:
ein Detail aus den Fig. 1 und 2, das den mehrteiligen Aufbau der Schrägscheibe zeigt und
Fig. 4:
ein Detail aus Fig. 2, aus dem die Abpufferung einer Lagerschale eines Gleitlagers gegenüber dem Axialkolbengehäuse mittels einer Elastomerschicht gezeigt ist.
Show it:
Fig. 1:
1 is a schematic sectional view of an axial piston machine with a swash plate designed as a pivoting cradle,
Fig. 2:
a 90 ° rotated view of Fig. 1 .
3:
a detail from the Fig. 1 and 2 showing the multi-part structure of the swash plate and
4:
a detail from Fig. 2 , from which the Abpufferung a bearing shell of a plain bearing opposite the axial piston housing is shown by means of an elastomer layer.

Ausführungsformen der ErfindungEmbodiments of the invention

In den Figuren sind gleiche Bauteile und Bauteile mit gleicher Funktion mit den gleichen Bezugszeichen gekennzeichnet.In the figures, the same components and components with the same function with the same reference numerals.

In Fig. 1 ist eine Axialkolbenmaschine 1 mit einer als Schwenkwiege ausgebildeten bzw. schwenkbar gelagerten Schrägscheibe 2 dargestellt. Die Axialkolbenmaschine 1 besitzt ein Gehäuse 3, in dem eine Welle 4 mit Hilfe zweier in axialer Richtung beabstandeter Wälzlager 5, 6 drehbar gelagert ist. Die Welle 4 ist mit einem Zylinderkörper 7 drehfest verbunden, wobei innerhalb von über den Umfang des Zylinderkörpers 7 verteilten Zylinderbohrungen 8 in axialer Richtung parallel zur Welle 4 bewegbare Kolben 9 angeordnet sind. Die Kolben 9 rotieren zusammen mit der Welle 4 und dem Zylinderkörper 7 in Umfangsrichtung und stützen sich dabei mit Gleitschuhen 10 auf der Gleitoberfläche 11 der Schrägscheibe 2 ab. Mit Hilfe einer Schraubendruckfeder 12 wird der Zylinderkörper 7 gegen eine Steuerplatte 13 angefedert, in der eine Saugniere 14 und eine Druckniere 15 eingebracht sind. Die Steuerplatte 13 liegt mit der in der Zeichnungsebene rechten Seite an einer Anschlussplatte 16 in der Weise an, dass sich die Saugniere 14 an einem Sauganschluss 17 und die Druckniere 15 an einem Druckanschluss 18 befinden. Durch die Rotation des Zylinderkörpers 7 um die nicht eingezeichnete Zylinderachse und durch die kinematische Führung der Kolben 9 in den Zylinderbohrungen 8 und an der Schrägscheibe 2 bzw. an der Schwenkwiege führen die Kolben 9 periodische Bewegungen in axialer Richtung parallel zur Welle 4 aus, wobei in der Bewegungsrichtung von der Steuerplatte 13 weg das Fluid aus der Saugniere 14 angesaugt wird, wobei das Fluid in der entgegengesetzten Bewegungsrichtung in die Druckniere 15 gefördert wird.In Fig. 1 is an axial piston machine 1 with a swivel plate designed as a pivoting or pivotally mounted swash plate 2 shown. The axial piston machine 1 has a housing 3 in which a shaft 4 is rotatably supported by means of two roller bearings 5, 6 spaced apart in the axial direction. The shaft 4 is rotatably connected to a cylinder body 7, wherein within the cylinder body 7 distributed over the circumference of the cylinder body 8 in the axial direction parallel to the shaft 4 movable piston 9 are arranged. The pistons 9 rotate together with the shaft 4 and the cylinder body 7 in the circumferential direction and are supported by sliding shoes 10 on the sliding surface 11 of the swash plate 2 from. With the aid of a helical compression spring 12, the cylinder body 7 is sprung against a control plate 13, in which a suction kidney 14 and a pressure kidney 15 are introduced. The control plate 13 rests with the right side in the drawing plane on a connection plate 16 in such a way that the suction kidney 14 at a suction port 17 and the pressure kidney 15 at a pressure port 18 are. By the rotation of the cylinder body 7 about the non-drawn cylinder axis and by the kinematic guidance of the piston 9 in the cylinder bores 8 and on the swash plate 2 and on the pivoting cradle, the pistons 9 perform periodic movements in the axial direction parallel to the shaft 4, wherein in the direction of movement of the control plate 13, the fluid is sucked from the suction kidney 14, wherein the fluid is conveyed in the opposite direction of pressure in the print kidney 15.

In der Darstellung gemäß Fig. 1 ist die Schrägscheibe 2 in einer Schrägposition dargestellt, wohingegen die Schrägscheibe 2 in Fig. 2 eine nicht geneigte, d.h. orthogonal zur Welle 4 angeordnete Position einnimmt. Wird die Welle 4 in letzterer Position der Schrägscheibe 2 in Rotation versetzt, bewegen sich die Kolben 9 nicht axial, sondern nur in Umfangsrichtung und es erfolgt keine Fluidförderung, wohl aber werden die Kolben beim Überstreichen der Druckniere bzw. Saugniere abwechselnd mit Förderdruck bzw. Saugdruck beaufschlagt.In the illustration according to Fig. 1 the swash plate 2 is shown in a slanted position, whereas the swash plate 2 in Fig. 2 a non-inclined, that is arranged orthogonal to the shaft 4 position. If the shaft 4 is set in rotation in the latter position of the swash plate 2, the pistons 9 do not move axially, but only in the circumferential direction and there is no fluid delivery, but the pistons when passing the pressure kidney or suction kidney alternately with delivery pressure or suction pressure applied.

Befindet sich die Schrägscheibe 2 in Betriebsposition gemäß Fig. 1 wirken auf die Kolben hohe Kräfte mit wechselnder Amplitude, wodurch Körperschallwellen entstehen. Zur Reduzierung der Körperschallweiterleitung durch die Schrägscheibe 2 hindurch zu dem Gehäuse 3 ist die Schrägscheibe 2 aus drei parallelen Bauteilen 19, 20, 21 ausgebildet, wobei die Gleitoberfläche 11 von dem Bauteil 19 aus Metall gebildet ist. Bauteil 21 bildet einen Grundkörper der Schrägscheibe 2 aus, wohingegen Bauteil 20 als Zwischenschicht zwischen dem Bauteil 19 und Bauteil 21 ausgeführt ist (vgl. Fig. 3). Zwischen dem Bauteil 19 und dem Bauteil 20 sowie zwischen dem Bauteil 20 und dem Bauteil 21 ist jeweils eine Elastomerschicht 22, 23 angeordnet, wobei die Bauteile 19, 20, 21 ausschließlich durch die Elastomerschichten 22, 23 zusammengehalten werden. Die Elastomerschichten 22, 23 weisen ein geringeres Elastizitätsmodul und eine geringere Dichte auf als die Bauteile 19, 20, 21 aus Metall, insbesondere aus Stahl, so dass an den Grenzflächen 24, 25 zwischen dem Bauteil 19 und der Elastomerschicht 22 sowie zwischen dem Bauteil 20 und der Elastomerschicht 23 ein Impedanzsprung realisiert ist, aufgrund dessen die Körperschallwellen zurück in Richtung der Kolben 9 reflektiert werden. Aufgrund der Dämpfungseigenschaft des Elastomermaterials erfolgt gleichzeitig eine Dissipierung der Schwingungsenergie in Form von Wärme.If the swashplate 2 is in the operating position according to FIG Fig. 1 act on the piston high forces with varying amplitude, which structure-borne sound waves arise. To reduce structure-borne sound transmission through the swashplate 2 to the housing 3, the swash plate 2 is formed from three parallel components 19, 20, 21, wherein the sliding surface 11 is formed by the component 19 made of metal. Component 21 forms a main body of the swash plate 2, whereas component 20 is designed as an intermediate layer between the component 19 and component 21 (see. Fig. 3 ). Between the component 19 and the component 20 and between the component 20 and the component 21, an elastomer layer 22, 23 is arranged in each case, wherein the components 19, 20, 21 are held together exclusively by the elastomer layers 22, 23. The elastomer layers 22, 23 have a lower modulus of elasticity and a lower density than the components 19, 20, 21 made of metal, in particular made of steel, so that at the boundary surfaces 24, 25 between the component 19 and the elastomer layer 22 and between the component 20 and the elastomer layer 23 an impedance jump is realized, due to which the structure-borne sound waves are reflected back in the direction of the piston 9. Due to the damping property of the elastomer material, there is simultaneously a dissipation of the vibration energy in the form of heat.

Zur zusätzlichen Verminderung einer Geräuschentwicklung ist bei dem gezeigten Ausführungsbeispiel vorgesehen, dass die Lagerschale 26 des als Gleitlager ausgebildeten Lagers 27 zur verschwenkbaren Lagerung der Schrägscheibe 2 über eine Elastomerschicht 28 mit dem Gehäuse 3 verbunden ist. Hierdurch erfolgt an mehreren beabstandeten Stellen der Schrägscheibe 2 sowohl eine Schwingungsdämpfung als auch eine Schwingungsdämmung.To additionally reduce noise, it is provided in the exemplary embodiment shown that the bearing shell 26 of the bearing 27 designed as a slide bearing is connected to the housing 3 via an elastomer layer 28 for the pivotable mounting of the swashplate 2. This results in a plurality of spaced locations of the swash plate 2, both a vibration damping and a vibration isolation.

Claims (9)

  1. Axial piston engine having a housing (3) and having pistons (9) which are supported on a swashplate (2) and which are arranged in cylinder bores (8) of a cylinder body (7) which is rotatable within the housing (3), with at least one elastomer layer (22, 23, 28) being provided for reducing the propagation of body-borne sound from the pistons (9) via the swashplate (2) to the housing (3),
    characterized
    in that the swashplate (2) is of multi-part, in particular two-part design and in that the elastomer layer (22, 23, 28) is arranged between at least two parts (19, 20, 21, 26) of the swashplate (2).
  2. Axial piston engine according to Claim 1, characterized in that the elastomer layer (22, 23, 28) has a lower modulus of elasticity and/or a lower density than the metallic components (19, 20, 21) of the swashplate.
  3. Axial piston engine according to Claim 1, characterized in that the at least two parts (19, 20, 21, 26) of the swashplate (2) are connected to one another preferably exclusively via the elastomer layer (22, 23, 28).
  4. Axial piston engine according to one of Claims 1 or 3, characterized in that the elastomer layer (22, 23, 28) is arranged parallel to a sliding surface (11), which faces towards the pistons (9), of the swashplate (2).
  5. Axial piston engine according to one of the preceding claims, characterized in that the swashplate (2) is designed as a pivot cradle which is mounted in the housing (2) by means of at least one bearing (27), and in that the elastomer layer (28) is integrated into the bearing (27).
  6. Axial piston engine according to Claim 5, characterized in that the elastomer layer (28) is arranged between a bearing shell (26), composed in particular of bronze, and the housing (2), composed in particular of an iron alloy, preferably cast iron, and/or between a bearing shell, composed in particular of bronze, and the swashplate (2), composed in particular of an iron alloy, preferably cast iron.
  7. Axial piston engine according to one of Claims 5 or 6, characterized in that the bearing (27) is designed as a plain bearing.
  8. Axial piston engine according to one of the preceding claims, characterized in that the bearing (27) is designed as a rolling bearing.
  9. Axial piston engine according to one of the preceding claims, characterized in that the elastomer layer (22, 23, 28) is of multi-ply form, with at least two plies being composed of different materials.
EP20070112283 2006-09-04 2007-07-11 Muffled and/or silenced axial piston engine Not-in-force EP1898088B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610041395 DE102006041395A1 (en) 2006-09-04 2006-09-04 Sound-damped and / or sound-insulated axial piston machine

Publications (3)

Publication Number Publication Date
EP1898088A2 EP1898088A2 (en) 2008-03-12
EP1898088A3 EP1898088A3 (en) 2009-10-21
EP1898088B1 true EP1898088B1 (en) 2011-01-26

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EP20070112283 Not-in-force EP1898088B1 (en) 2006-09-04 2007-07-11 Muffled and/or silenced axial piston engine

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DE102014207329A1 (en) 2014-04-16 2015-10-22 Robert Bosch Gmbh Fluidic displacement machine

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US3991658A (en) * 1972-06-20 1976-11-16 Bobier Wilfred S Fluid device having sintered metal components
US4508011A (en) * 1982-04-02 1985-04-02 Abex Corporation Hydraulic axial piston machine
DE19960941A1 (en) * 1999-12-17 2001-06-21 Schaeffler Waelzlager Ohg Axial piston machine with swashplate, with freewheel mechanisms and rolling bearings between casing, intermediate member and swashplate
US7743694B2 (en) * 2004-11-20 2010-06-29 Lik Fahrzeug-Hydraulik GmbH & Co. KG Axial piston machine

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