EP1557562A1 - Système distributeur pour un moteur hydraulique à piston radial - Google Patents

Système distributeur pour un moteur hydraulique à piston radial Download PDF

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Publication number
EP1557562A1
EP1557562A1 EP04468002A EP04468002A EP1557562A1 EP 1557562 A1 EP1557562 A1 EP 1557562A1 EP 04468002 A EP04468002 A EP 04468002A EP 04468002 A EP04468002 A EP 04468002A EP 1557562 A1 EP1557562 A1 EP 1557562A1
Authority
EP
European Patent Office
Prior art keywords
distribution
outline
piston
hydraulic engine
piston block
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
Application number
EP04468002A
Other languages
German (de)
English (en)
Other versions
EP1557562B1 (fr
Inventor
Jurij Manfreda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MANFREDA, MARIJA
MANFREDA, SIMON
PERAT, ERICA
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP04468002A priority Critical patent/EP1557562B1/fr
Priority to DE602004021554T priority patent/DE602004021554D1/de
Priority to AT04468002T priority patent/ATE434129T1/de
Publication of EP1557562A1 publication Critical patent/EP1557562A1/fr
Application granted granted Critical
Publication of EP1557562B1 publication Critical patent/EP1557562B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0435—Particularities relating to the distribution members
    • F03C1/0444—Particularities relating to the distribution members to plate-like distribution members

Definitions

  • the present invention refers to a distribution system for a piston hydraulic engine, in particularly for an engine with a rotating piston block, said engine comprising a distribution body with distribution channels, and a block with pistons and feeding channels arranged coaxially to the distribution body.
  • a distributor with hydraulic engines is common for all pistons, therefore, the piston position must alternate with regard to the distributor, or vice versa.
  • the circular distributor is placed coaxially with the engine axis where it rotates, whereas the piston block remains stationary.
  • Such a solution is disclosed in DE 19 653 591 C1.
  • the drawback of said solution is wear and tear of the mutually cooperating distributor surfaces, resulting in an increased gap and leakage between channels and from the distributor into the housing, which increases with the power of three of the gap width.
  • said solution does not provide a hollow shaft design of a hydraulic engine.
  • a hydraulic engine comprising a distributor is known from the publication of the patent application DE 44 05 123.
  • the separation of the sliding surfaces is solved by means of different combinations of contact, sealing, and resilient elements by means of which the fluid pressure is also applied to the rear of the distributor.
  • a constantly moving gap is achieved therewith, while the stationary gap increases due to wear, resulting in the seals preloading.
  • each distribution plate is formed with distribution apertures, the radial position thereof is equal to the radial position of distribution channels in the distribution body and of feeding channels in the piston block, respectively.
  • the distribution apertures coincide with said channels, where the outline of each distribution aperture, in at least one of the distribution plates, is selected to be a circle, square, rectangle or trapezium, preferably an annular segment.
  • annular spacers are inserted in a pressure-tight manner into each mouth of the distribution channels being provided, equally radially spaced, in the distribution body and piston block, respectively, said annular spacers being covered and held by means of an annular distribution plate.
  • the latter is associated in a pressure-tight manner with the distribution body and piston block, respectively, and projects in an axial direction, when installed, above the surface of the distribution body and the piston block, respectively.
  • Each distribution plate is formed with distribution apertures, the radial position thereof is equal to the radial position of the annular spacers in the mouth of each distribution channels.
  • the outline of each distribution aperture, at least in one of the distribution plates, is selected to be a circle, square, rectangle or trapezium, preferably an annular segment.
  • one of the distribution plates preferably the distribution plate being associated with the distribution body, is made of a wear-resistant material.
  • the pistons and the piston block therewith wears more than the distribution body. Therefore, it has been proven that when the piston block has sufficient wear and requires replacing, the less resistant distribution plate attached to the piston block is replaced simultaneously.
  • the distribution plates and the annular spacers are connected in a pressure-tight manner both mutually as well as with the distribution body and the piston block, respectively. Connection can be completed by means of soldering, gluing or similar. Both the distribution plates as well as the annular spacers can be manufactured by means of punching, sintering, die casting or similar convenient method.
  • a piston hydraulic engine consist of a two-part housing 1a, 1b joined face to face and a cam ring 2 arranged between the two halves of the housing 1a, 1b, where each contact surface between the housing and the cam ring 2 is appropriately sealed against leakage of hydraulic fluid.
  • a cylindrical distribution body 3 is arranged in the first half of the housing 1a, said body 3 being in a manner known per se separated from the housing 1a by means of a plurality of sealing elements 4.
  • Said housing 1a is formed on the inner surface thereof being in contact with the distribution body 3 with annular chambers 5, 6 intended for feeding and discharge, respectively, hydraulic fluid, said chambers being arranged between each pair of the sealing elements 4.
  • the first chamber 5 is a high-pressure feeding chamber
  • the second chamber 6 is a low-pressure discharge chamber. If it is required to change the direction of rotation, the pressure only needs to be switched in each of the chambers, so that the high-pressure chamber becomes the low-pressure chamber and vice versa.
  • the distribution body 3 is secured against rotation relatively to the housing 1a in a manner known per se and therefore not shown in detail.
  • the distribution body 3 is in its radial edge area and on the side facing the piston block formed with a plurality of distribution channels 7, 7' being equally spaced on the circumference of said body and extending parallel to the axis of the body 3, said channels being alternately connected to the high-pressure feeding chamber 5 and the low-pressure discharge chamber 6 provided in the housing 1a of the hydraulic engine. Said connection of the channels and annular chambers is carried out by means of transversal channels 8, 8'. The total number of said channels is always even and corresponds to double the cam lobes of the cam ring 2, said lobes cooperate with the pistons of the hydraulic engine.
  • each distribution channel 7, 7' facing the piston block is closed with an annular spacer 9 comprising a through-hole 9', the outline thereof on the feeding side, i.e. the side facing each channel, is adapted to the outline of the channel 7, 7', while the outline of the through-hole 9' on the discharge side, i.e. the side averted from each channel, is selected in a manner that the coefficient of the fluid resistance is as low as possible.
  • the outline of the through-hole 9' on the discharge side can be a circle, a square, a rectangle or a trapezium, preferably an annular segment, as it is shown in Fig. 2, Fig. 3 and Fig. 4.
  • the annular spacers 9 are covered and held with an annular distribution plate 10 associated with the distribution body 3 and, when installed, projecting in an axial direction above the surface of the body 3.
  • Said distribution plate 10 is formed with distribution apertures 11 the radial position thereof is equal to the radial position of the through-hole 9' of each annular spacer 9, where the outline of each distribution aperture 11 is identical to the outline of the through-hole 9' at the discharge side of each annular spacer 9, so that the through-holes 9' and the distribution apertures 11 entirely coincide.
  • the distribution body 3 is formed on its opposite end with a plurality of radially spaced blind holes wherein compression springs 12 are arranged. The latter are loaded in the axial direction by means of a pressure plate 13 attached to the housing 1a.
  • each piston 15 is continuously in contact with the cam ring 2 via a roller 16.
  • the piston block 14 on the side facing the distribution body 3 is provided with a plurality of feeding channels 17 equally spaced on the circumference of said body and parallel to the axis of piston block 14, said channels being located at the same radial distance as are the channels 7, 7' in the distribution body 3.
  • the number of the feeding channels 17 equals the number of the pistons 15 in the block 14.
  • each channel 17 facing the distribution body 3 ends in an annular spacer 18 comprising a through-hole 18' the outline thereof at the discharging side, i.e. the side being averted from each channel, is adapted to the outline of the channel 17, while the outline of the through-hole 18' at the feeding side thereof, i.e. the side facing each channel, is selected in a manner that the coefficient of the fluid resistance is as low as possible.
  • the outline of said through-hole on the feeding side can be a circle, a square, a rectangle or a trapezium, preferably an annular segment, as it is provided with the through-holes 9' in the annular spacers 9 in the distribution body 3.
  • the annular spacers 18 are covered and held by means of a distribution plate 19 being associated with the piston block 14 and projecting, when installed, in an axial direction above the surface of the block 14.
  • Said distribution plate 19 is formed with distribution apertures 20 the radial position thereof equaling the radial position of the through-hole 18' of each annular spacer 18, the outline of each distribution aperture 20 is identical to the outline of the through-hole 18' at the feeding side of each annular spacer 18, so that the through-holes 18' and the distribution apertures 20 entirely coincide.
  • the above mentioned pressure plate 13 which presses a plurality of springs arranged in the distribution body 3 continuously provides load in the axial direction of the hydraulic engine resulting in the distribution plate 10 on the distribution body 3 being permanently pressed against the distribution plate 19 on the piston block 14, regardless of the wear and tear of the two distribution plates or the pressure of the hydraulic fluid.
  • the distribution plates 10, 19 as well as the apertures 11, 20 could be produced by means of punching, sintering, or die casting, depending on the material used, since the present invention facilitates the use of arbitrary materials.
  • Another embodiment of the distribution system is possible according to the present invention, where only distribution plates are employed, without annular spacers. Dimensions of the distribution apertures in each distribution plate can be optionally modified and the same applies to the channels. Such embodiment allows an increase in the allowable rotational frequency and decreasing of the hydraulic loss, respectively.
  • the distribution plate which is less resistant against the wear and tear is installed on the piston block, thus it can be replaced quickly and simply, if necessary, together with the piston block.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Hydraulic Motors (AREA)
EP04468002A 2004-01-23 2004-01-23 Système distributeur pour un moteur hydraulique à piston radial Expired - Lifetime EP1557562B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP04468002A EP1557562B1 (fr) 2004-01-23 2004-01-23 Système distributeur pour un moteur hydraulique à piston radial
DE602004021554T DE602004021554D1 (de) 2004-01-23 2004-01-23 Verteilervorrichtung für einen hydraulischen Radialkolbenmotor
AT04468002T ATE434129T1 (de) 2004-01-23 2004-01-23 Verteilervorrichtung für einen hydraulischen radialkolbenmotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04468002A EP1557562B1 (fr) 2004-01-23 2004-01-23 Système distributeur pour un moteur hydraulique à piston radial

Publications (2)

Publication Number Publication Date
EP1557562A1 true EP1557562A1 (fr) 2005-07-27
EP1557562B1 EP1557562B1 (fr) 2009-06-17

Family

ID=34626580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04468002A Expired - Lifetime EP1557562B1 (fr) 2004-01-23 2004-01-23 Système distributeur pour un moteur hydraulique à piston radial

Country Status (3)

Country Link
EP (1) EP1557562B1 (fr)
AT (1) ATE434129T1 (fr)
DE (1) DE602004021554D1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1319986A (fr) * 1962-04-20 1963-03-01 Angus George Co Ltd Perfectionnement aux pompes et moteurs hydrauliques
US3796136A (en) * 1970-09-24 1974-03-12 Kawasaki Heavy Ind Ltd Fluid pump or fluid motor
US4522110A (en) * 1982-09-08 1985-06-11 Ab Hagglund & Soner Hydraulic radial piston motor
DE4405123A1 (de) * 1993-02-19 1994-08-25 Poclain Hydraulics Sa Druckflüssigkeitsmechanismus mit hülsenförmigen Kontaktstücken, wie beispielsweise ein Hydraulikmotor oder eine Hydraulikpumpe
DE19653591C1 (de) * 1996-12-20 1998-01-15 Korea Mach & Materials Inst Fluidverteilungsapparat für hydraulische Kolbenpumpen oder -motoren
US6470786B2 (en) * 1999-12-08 2002-10-29 Santasalo Hydraulics Oy Radial piston hydraulic engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1319986A (fr) * 1962-04-20 1963-03-01 Angus George Co Ltd Perfectionnement aux pompes et moteurs hydrauliques
US3796136A (en) * 1970-09-24 1974-03-12 Kawasaki Heavy Ind Ltd Fluid pump or fluid motor
US4522110A (en) * 1982-09-08 1985-06-11 Ab Hagglund & Soner Hydraulic radial piston motor
DE4405123A1 (de) * 1993-02-19 1994-08-25 Poclain Hydraulics Sa Druckflüssigkeitsmechanismus mit hülsenförmigen Kontaktstücken, wie beispielsweise ein Hydraulikmotor oder eine Hydraulikpumpe
DE19653591C1 (de) * 1996-12-20 1998-01-15 Korea Mach & Materials Inst Fluidverteilungsapparat für hydraulische Kolbenpumpen oder -motoren
US6470786B2 (en) * 1999-12-08 2002-10-29 Santasalo Hydraulics Oy Radial piston hydraulic engine

Also Published As

Publication number Publication date
DE602004021554D1 (de) 2009-07-30
ATE434129T1 (de) 2009-07-15
EP1557562B1 (fr) 2009-06-17

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