EP0255034B1 - Axial-Kolbenmaschine mit einer Einrichtung zum Spülen des Kreislaufs - Google Patents

Axial-Kolbenmaschine mit einer Einrichtung zum Spülen des Kreislaufs Download PDF

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Publication number
EP0255034B1
EP0255034B1 EP87110616A EP87110616A EP0255034B1 EP 0255034 B1 EP0255034 B1 EP 0255034B1 EP 87110616 A EP87110616 A EP 87110616A EP 87110616 A EP87110616 A EP 87110616A EP 0255034 B1 EP0255034 B1 EP 0255034B1
Authority
EP
European Patent Office
Prior art keywords
piston machine
axial piston
machine according
duct
valve
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
Application number
EP87110616A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0255034A1 (de
Inventor
Ludwig Wagenseil
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.)
Hydromatik GmbH
Original Assignee
Hydromatik GmbH
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 Hydromatik GmbH filed Critical Hydromatik GmbH
Publication of EP0255034A1 publication Critical patent/EP0255034A1/de
Application granted granted Critical
Publication of EP0255034B1 publication Critical patent/EP0255034B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F04B1/2021—Details or component parts characterised by the contact area between cylinder barrel and valve plate

Definitions

  • the invention relates to an axial piston machine according to the preamble of claim 1.
  • FIG. 13 is formed by a cylindrical piston slide and is displaceably arranged in a guide bore extending in the control part.
  • the two end faces of the spool delimit hydraulic working areas, one of which is connected to the HP line and the other to the LP line of the axial piston machine.
  • each angular channels are provided, of which the radial channel can be connected to a feed pressure line, specifically the arrangement is such that the channel carrying the low pressure can be connected to the feed pressure line.
  • the two hydrostatic machines are assigned a common control part, so that this hydrostatic transmission forms a compact component, and the flushing valve of the flushing device is arranged in the common control part.
  • the flushing valve is formed by two spring-loaded check valves, which are arranged in the web section of a U-shaped channel arrangement, which connect the other HD / LP line pair to a common flushing channel.
  • the flush valve itself is complex because it comprises two spring-loaded check valves, but there is also a complicated course of the line arrangement accommodating the check valves, because a total of four channel sections have to be installed in the control part in order to implement the line arrangement required for flushing, two additional check valves to be arranged with return springs.
  • the result is a complex design, it must be taken into account that the four line sections are to be accommodated in the control part, which leads to a complicated line arrangement which weakens the control part due to the relatively small design of the control part.
  • the channel sections extending between the check valves and the LP or HP channel must be drilled from the outside.
  • the invention has for its object to simplify the device for rinsing.
  • both the flushing channel arrangement in the control part and the flushing valve are considerably simplified, so that the manufacturing and assembly work is considerably reduced.
  • a control slide is used, which can be formed in one piece and also represents a significant simplification.
  • Another advantage of the configuration according to the invention is that the flushing medium is discharged directly into the cavity of the housing, so that no additional lines to be laid outside the housing are required.
  • the device for feeding the circuit is not arranged in the area of the control part. Therefore, the configuration according to the invention can be integrated very advantageously with a device for dining, which is described and illustrated in German Patent No. 2,247,437.
  • the device for flushing simultaneously fulfills a lubrication function for the bearing of the central guide pin and / or for the mounting of the drive shaft.
  • the flushing medium reaches the cavity of the housing via the respective bearing point and is returned to the pressure medium tank by means of the leakage line which is required anyway.
  • a minimum low pressure or a minimum feed pressure can be maintained by the configurations according to claims 20 to 22, which is particularly important when starting up the axial piston machine. In addition, these features also contribute to a further simplification of the axial piston machine.
  • the axial piston machine generally designated I in FIG. I is of the sliding axis type with a housing 2 in which a drive shaft 3 is rotatably mounted by means of roller bearings 4, 5 and a cylinder block 7 driven by the drive flange 6 of the drive shaft 3 .
  • a plurality of spherical pistons 8 arranged on a pitch circle are displaceable in piston bores 9, which are supported with spherical piston heads II in spherical bearings 12 in the drive flange 6.
  • a guide pin 13 is mounted in the center of the cylinder block 7 in a guide bore 14, which likewise has a spherical head 15 with which it is mounted in a central spherical bearing 16 of the drive flange 6.
  • a compression spring 17 is arranged in the guide bore 14, the purpose of which is to elastically prestress the cylinder block 7 toward the side facing away from the drive flange 6 against a control disk 18 on which the cylinder block 7 is mounted.
  • the control disk 18 has, on its side facing the cylinder block 7, a spherically convexly curved sliding bearing surface 19, against which a spherically concavely curved sliding bearing surface 21 of the cylinder block bears under the elastic prestress of the compression spring 17.
  • the control disk 18 is fixed by means of centering pins 22 to a housing cover 24 which seals the cavity 23 of the housing 2. On the other end face, the housing 2 is closed and sealed by a flange 25.
  • the axial piston machine I is assigned a device for rinsing the circuit, which is only shown in FIGS. 2 and 3 and is generally designated 31, but the flow course of the rinsing oil is shown in FIG. 1 by an arrow line 32.
  • the device 31 for flushing comprises a flush valve 33 integrated into the control disk 18, which is formed by a valve needle 34 which is slidably mounted in a guide bore 35 which diametrically intersects in the control disk 18, ie, intersecting the central axis 36, between the working channels , namely the existing control kidneys 37, 38 which, depending on the function of the axial piston machine, each form the high-pressure duct (HD) or the low-pressure duct (ND).
  • the valve needle 34 is dimensioned longer than the distance a between the control kidneys 37, 38. The displacement movement of the valve needle 34 is limited by stops 39, 41 which are formed by the outer walls of the control kidneys 37, 38.
  • the length L of the valve needle 34 is selected so that in the stop positions the end of the valve needle 34 facing away from the respective stop 39, 41 projects into the control kidney 37, 38 in question.
  • the passage of the purge valve 33 is formed by a longitudinal groove 42 in the valve needle 34, the length 1 of which corresponds approximately to the distance a between the control kidneys 37, 38.
  • the arrangement of the longitudinal groove 42 is such that when the valve needle 34 stops on the left stop 39 (shown in FIGS. 2 and 3), the left end of the longitudinal groove 42 projects into the control kidney 37, so that an opening 43 results.
  • the flow cross section of the passage can be determined through this opening 43 or through the cross section of the longitudinal groove 42 in the sense of a throttle.
  • the right end of the longitudinal groove 42 is covered by the wall of the guide bore 35, so that there is only one passage between the control kidney 37 and a connecting channel 44 arranged in the center of the control disk 18.
  • the valve needle 34 stops on the right stop 41, the right end of the longitudinal groove 42 projects into the control kidney 38 to form an opening 42, while the left end of the longitudinal groove 42 is covered by the wall of the guide bore 35.
  • the flush valve 33 is automatically controlled by the respective high pressure, which acts on the respective end face 45 of the valve needle 34 and displaces it against the respective stop 39 or 41.
  • the valve needle 34 has been displaced to the left against the stop 39 by the high pressure in the control kidney 38.
  • the switching position of the purge valve 33 or the valve needle 34 there is a connection between the low-pressure control kidneys, that is to say the LP line, with the connecting channel 44. This sits in the cylinder block 7, in a spring receiving part 46 and in accordance with FIGS Guide pin 13 continues so that the flushing oil coming from the respective LP line reaches the bearing 16 (FIG. I) for lubrication thereof.
  • the connecting channel 44 continues first as an axial bore 47 and then as a diametric bore 48 in the drive shaft 3, the latter opening radially between the two existing roller bearings 4, 5.
  • the flushing oil thus passes from the bearing 16 to the roller bearings 4, 5, where it executes the flow identified by the arrow line 32 in FIG. 1 and reaches the cavity 23 of the housing 2.
  • a leakage oil line leads from one of the connections 49, 50 to the oil reservoir.
  • a second connecting channel 52 is provided between the flushing valve 33 and the cavity 23 of the housing, which also starts from the axial channel section 53 in the control disk 18, but initially rises dial below the control disc 18 and then extends axially in the housing cover 24.
  • This configuration makes it possible to use one and the same control disk 18 for such constructions in which it is not desirable or not possible for the flushing oil to be removed by the cylinder block 7.
  • the connecting channel 52 is closed by a sealing washer 54, which is inserted in a recess on the underside of the control disk 18.
  • a pressure valve 56 opening in the flow direction of the flushing oil is arranged in the connecting channel 44, the purpose of which is to maintain a minimum low pressure or a minimum feed pressure.
  • the pressure valve 56 consists of a conical valve body 57, which is biased against the flow direction of the flushing oil by 58 by a compression spring 59 against a valve seat 60, which is formed by the spring receiving part 46.
  • the pressure valve 56 is thus arranged in the cylinder block 7 or in the guide pin 13 or assigned to these parts.
  • the valve needle 34 can be assembled or disassembled through a mounting hole 62 which is aligned with the guide bore 35 in an edge section 63 arranged on the outside of the control sleeve 38.
  • the mounting hole 62 is closed by a plug 64 which forms the stop 41.
  • the stroke that the valve needle 34 executes under the effect of the high pressure is dependent on its length L and on the distance of the stops 39, 41 from one another.
  • the stops 39, 41 are located within the control loops 37, 38.
  • the stops 39, 34 are formed by extensions 65 on two sealing plugs 64 which protrude into the control loops 37, 38, the sealing plugs 64 are arranged in the region of the edge sections 63 of a continuous mounting hole 62 and fastened therein.
  • valve needle 34 The displacement of the valve needle 34 is dependent on its length L and on the distance between the outer walls of the control sleeve 37, 38. According to FIG. 4, the valve needle 34 is approximately the lengths of the extensions 65 or Stops 39, 41 are of shorter dimensions, but in this exemplary embodiment they also protrude on both sides into the free space of the control channels 37, 38.
  • the cross section of the extensions 65 is preferably tapered to reduce the flow resistance it exerts.
  • the extensions 65 are tapered cylindrical sections
  • valve spring 34 is centered by spring force. 4 serve for this purpose two compression springs 71 arranged on both sides of the valve needle 34, which can be supported on the outer walls of the control kidneys 37, 38 or also on the shoulders of the sealing plugs 64 and act with their inner ends against shoulders 72 on the valve needle 34.
  • Schultem 72 can be arranged on valve needle 34 itself.
  • the shoulders 72 are arranged on flange pieces 73 which are fastened in the region of the ends of the valve needle 34 or are fitted on the tapered sections 74 of the valve needle 34. The distance between the shoulders 75, i.e. the distance between the flange pieces 73 corresponds to the distance a between the inner walls of the control kidneys 37, 38.
  • valve needle 34 is thus fixed relatively stable in its center-centered position. Due to the respectively occurring high pressure, the valve needle 34 is shifted to the left or right, so that one end of the longitudinal groove 42 protrudes into the respective control kidney 37, 38, whereby the passage to the connecting channel section 53 is opened. In the depressurized state, the valve needle 34 is again in its center-centered position. The stroke which the valve needle 34 exerts from this position is denoted by h.
  • a substantially straight spiral spring 81 is used for centering the valve needle 34, which extends transversely to the valve needle 34 and engages with its free end 82 in a hole in the valve needle 34.
  • the spiral spring 81 is arranged in a channel 83 which extends transversely to the guide bore 35 or to the valve needle 34 and preferably in the center thereof and is dimensioned in cross section so large that, in view of the stroke required for the valve needle 34, the spiral spring 81 performs the required deflection can
  • the channel 83 preferably extends radially to the control disk 18 and is drilled into it from the outside.
  • the channel 83 When the channel 83 extends beyond the guide bore 35 into the channel section 53, a connection to the control kidneys 37, 38 is hereby automatically created.
  • the channel 83 is preferably dimensioned larger in cross section than the guide bore 35 in order to obtain a passage around the valve needle 34.
  • the passage can also be formed by a through hole 84, into which the free end 82 of the spiral spring 81 surrounds.
  • a simple mounting of the spiral spring 81 results from the accommodation and mounting of its fastening end 85 in an axial hole of a sealing plug 86 for the channel 83.
  • the passage from the control kidney 38 to the connecting channel section 53 is open. In other words, high pressure is present in the control kidney 37.
  • the spiral spring 81 returns the valve spring 34 to its central position, in which - as in all of the previously described exemplary embodiments - the longitudinal groove 42 is closed because its length I is dimensioned shorter than the distance a between the inner ones Walls of the control kidneys 37, 38.
  • the control kidneys 37, 38 are adjoined in the region of their ends by axial channel sections 88, 89, in the region of which the guide bore 35 and the valve needle 34 are arranged.
  • Blind holes 91 are countersunk in the outer wall of the control kidney 38 or the channel section 89.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Fluid Gearings (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP87110616A 1986-07-31 1987-07-22 Axial-Kolbenmaschine mit einer Einrichtung zum Spülen des Kreislaufs Expired - Lifetime EP0255034B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3625941 1986-07-31
DE3625941 1986-07-31
DE3638890 1986-11-14
DE19863638890 DE3638890A1 (de) 1986-07-31 1986-11-14 Axial-kolbenmaschine mit einer einrichtung zum spuelen des kreislaufs

Publications (2)

Publication Number Publication Date
EP0255034A1 EP0255034A1 (de) 1988-02-03
EP0255034B1 true EP0255034B1 (de) 1990-05-09

Family

ID=25846102

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110616A Expired - Lifetime EP0255034B1 (de) 1986-07-31 1987-07-22 Axial-Kolbenmaschine mit einer Einrichtung zum Spülen des Kreislaufs

Country Status (4)

Country Link
US (1) US4765228A (enrdf_load_stackoverflow)
EP (1) EP0255034B1 (enrdf_load_stackoverflow)
JP (1) JP2568852B2 (enrdf_load_stackoverflow)
DE (2) DE3638890A1 (enrdf_load_stackoverflow)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231912A (en) * 1988-10-03 1993-08-03 Hitachi Construction Machinery Co., Ltd. Bent axis type variable displacement hydraulic machine
JP2577974B2 (ja) * 1988-10-03 1997-02-05 日立建機株式会社 容量可変型斜軸式液圧機械
JPH03100375A (ja) * 1989-09-11 1991-04-25 Toyooki Kogyo Co Ltd 油圧ポンプ
JP2512186B2 (ja) * 1990-02-19 1996-07-03 株式会社日立製作所 アキシヤルピストンポンプ装置
JP2814004B2 (ja) * 1990-02-23 1998-10-22 パロマ工業株式会社 ガス湯沸器
DE4128615C1 (enrdf_load_stackoverflow) * 1991-08-28 1993-01-14 Hydromatik Gmbh, 7915 Elchingen, De
DE4214243A1 (de) * 1992-04-30 1993-11-04 Schaeffler Waelzlager Kg Lagerung fuer zwei zueinander abgewinkelte bauteile innerhalb eines gehaeuses
DE4215869C2 (de) * 1992-05-14 1996-01-11 Hydromatik Gmbh Hydrostatische Maschine mit Leckölabführung
JP2625335B2 (ja) * 1992-10-23 1997-07-02 本田技研工業株式会社 静油圧式無段変速装置
US5412948A (en) * 1992-10-23 1995-05-09 Honda Giken Kogyo Kabushiki Kaisha Hydrostatic continuously variable transmission
US5466130A (en) * 1994-07-26 1995-11-14 Kobelt; Jacob Helm pump
DE29503060U1 (de) * 1995-02-23 1995-04-06 Brueninghaus Hydromatik GmbH, 89275 Elchingen Axialkolbenmaschine
DE19637419C1 (de) * 1996-09-13 1998-04-23 Meiller Fahrzeuge Hydropumpe und Hydromotor
DE19641865C5 (de) * 1996-10-10 2004-03-25 Brueninghaus Hydromatik Gmbh Axialkolbenmaschine mit Haltevorrichtung für die Zylindertrommel
DE19649195C1 (de) * 1996-11-27 1998-01-08 Brueninghaus Hydromatik Gmbh Axialkolbenmaschine mit Lagerspülung
US7014429B2 (en) * 2003-03-06 2006-03-21 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency High-efficiency, large angle, variable displacement hydraulic pump/motor
DE102004061863A1 (de) * 2004-12-22 2006-07-06 Brueninghaus Hydromatik Gmbh Kolben für Axialkolbenmaschine in Schrägachsenbauweise und Verfahren zur Herstellung solcher Kolben
CN101539129B (zh) * 2009-04-24 2013-04-24 上海纳博特斯克液压有限公司 一种轴式液压柱塞泵或马达
DE102009058332B4 (de) * 2009-12-15 2019-11-28 Robert Bosch Gmbh Axialkolbenmaschine
DE102012016068B4 (de) * 2012-08-14 2023-07-20 Robert Bosch Gmbh Anschlussvorrichtung für hydrostatische Maschine und hydrostatische Maschine
DE102012016059A1 (de) * 2012-08-14 2014-02-20 Robert Bosch Gmbh Gehäuseteil für hydrostatische Maschine und hydrostatische Maschine
DE102012016062A1 (de) * 2012-08-14 2014-02-20 Robert Bosch Gmbh Gehäuseteil für hydrostatische Maschine und hydrostatische Maschine
DE102012016060B4 (de) * 2012-08-14 2023-07-20 Robert Bosch Gmbh Gehäuseteil, hydrostatische Maschine und Verfahren zur Montage der hydrostatischen Maschine
EP3417171B1 (en) * 2016-06-06 2019-09-11 Parker Hannifin Corporation Hydraulic pump with inlet baffle
CN108005986A (zh) * 2017-12-31 2018-05-08 无锡威孚精密机械制造有限责任公司 一种柱塞马达用复合式配流装置
CN114001005B (zh) * 2021-11-02 2023-06-23 河南科技大学 一种液压柱塞泵

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JPS58102780U (ja) * 1981-12-29 1983-07-13 株式会社日本製鋼所 斜軸式アキシヤルピストンポンプ・モ−タ
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DE3340333C1 (de) * 1983-11-08 1985-06-27 Hydromatik GmbH, 7915 Elchingen Taumelscheiben-Axialkolbenpumpe

Also Published As

Publication number Publication date
DE3762670D1 (de) 1990-06-13
DE3638890C2 (enrdf_load_stackoverflow) 1990-08-30
DE3638890A1 (de) 1988-02-04
JPS6338690A (ja) 1988-02-19
US4765228A (en) 1988-08-23
EP0255034A1 (de) 1988-02-03
JP2568852B2 (ja) 1997-01-08

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