US3591965A - Hydrodrive - Google Patents

Hydrodrive Download PDF

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Publication number
US3591965A
US3591965A US876907A US3591965DA US3591965A US 3591965 A US3591965 A US 3591965A US 876907 A US876907 A US 876907A US 3591965D A US3591965D A US 3591965DA US 3591965 A US3591965 A US 3591965A
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US
United States
Prior art keywords
fluid
feeding
hydrodrive
flushing
lines
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
US876907A
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English (en)
Inventor
Gerhard Bobst
Kurt Christiansen
Ludwig Wagenseil
Joachim Frank
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.)
Von Roll AG
Constantin Rauch KG
Original Assignee
Von Roll AG
Constantin Rauch KG
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 Von Roll AG, Constantin Rauch KG filed Critical Von Roll AG
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Publication of US3591965A publication Critical patent/US3591965A/en
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
    • F16H61/4104—Flushing, e.g. by using flushing valves or by connection to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H39/00—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution
    • F16H39/04—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit
    • F16H39/06—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type
    • F16H39/08—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type each with one main shaft and provided with pistons reciprocating in cylinders
    • F16H39/10—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type each with one main shaft and provided with pistons reciprocating in cylinders with cylinders arranged around, and parallel or approximately parallel to the main axis of the gearing

Definitions

  • a hydrodrive including a fluidcirculating drive system comprising at least two hydrounits connected by connecting conduit means with one unit being operable as a hydropump and the other unit being operable as a hydromotor.
  • a feeding and flushing means is provided for feeding fluid media into and removing fluid media from said fluid-circulating drive system.
  • At least one of the connecting conduit means between said hydrounits includes at least two lines and said feeding and flushing means including a feeding connection communicating with one of said lines and a flushing connection communicating with the other of said lines.
  • the invention relates to a hydrodrive, comprising at least two hydrounits connected by connecting conduit means, said hydrounits being such that one works as a hydropump and the other as hydromotor, and a feed installation and flushing or exhaust installation or means for feeding and removing pres sure medium into and out of the drive circulation.
  • conduit connections for feeding of fresh oil to hydrodrives which are used increasingly for the infinitely variable conversion of rotational speed, for example in vehi cles.
  • this fresh oil it is understood to include all pressure media employed in hydrodrives of mineral, chemical or other nature and filtered and cooled, if desired, and that conduit means are likewise provided for removing used oil.
  • These connections are located at the connecting conduit means between the pump portion comprising one or several hydropumps, and the motor portion, comprising one or several hydropumps, of the hydrodrive.
  • connection for removing oil which has circulated in the circulation of the drive be located directly at the exit of the motor portion, whereas the connection for the feeding of fresh oil for replenishing the oil which escaped during circulation as leakage loss and which has been removed to the motor portion, be located directly at the entrance to the pump portion.
  • Both connections are thus provided successively and require a certain spacial distance between the feeding and removal for the purpose of preventing a short circuit.
  • the present invention has for an object to provide a hydrodrive arrangement in which the feeding and flushing or exhaus ng is equally effective in all operating conditions and which is also devoid of the danger of short circuiting.
  • connections for feeding and flushing are disposed in a component of a hydrounit containing the control means or valve plate.
  • the valves for controlling the feeding and flushing can be built into the control body or valve plate of a hydrounit.
  • the invention provides an arrangement in which the connections for feeding and flushing can be located in a housing wall adjoining the valve plate or control member ofa hydrounit.
  • connections for feeding and flushing, while providing the force equilibrium can be located in the movable control member ofa hydrounit.
  • connections for feeding and flushing are disposed at equal distances from the end of the connecting conduit means.
  • the connecting conduit means being suitably divided into at least two lines along its entire length.
  • control member can be in hydraulic equilibrium due to the position or location of and the size of the mouths of the lines of the connecting conduits in the control member.
  • FIG. I is a diagrammatic perspective view, with parts removed, illustrating a hydrodrive arrangement according to the invention and particularly showing the fluid media feeding and flushing or exhausting means of the invention;
  • FIG. 2 is a fragmentary longitudinal sectional view of a hydrodrive arrangement of the invention as taken along line II-II of FIG. 3;
  • FIG. 3 is a transverse sectional view taken along line III-III of FIG. 2;
  • FIG. 4 is a view similar to FIG. 3 illustrating a second embodiment of the invention and taken along line IV-IV of FIG.
  • FIG. 5 is a transverse sectional view taken along line V-V of FIG. 4;
  • FIG. 6 is a view similar to FIGS. 2 and 4 illustrating a third embodiment of the invention and taken along line VI-VI of FIG. 7;
  • FIG. 7 is a transverse sectional view taken along line VII-VII of FIG. 6;
  • FIG. 8 is a view similar to FIGS. 2, 4 and 6 illustrating a fourth embodiment of the invention and taken along line VIII-VIII of FIG. 9;
  • FIG. 9 is a transverse sectional view taken along line IX-IX of FIG. 8.
  • the hydrounits of a hydrodrive are generally designated at 1 and 2. These units, which are only partially illustrated, are of the known axial piston type. Such units in clude a cylinder block provided with substantially parallel piston-accommodating bores, casing means within which the cylinder block is mounted for rotation, pistons within each bore, a driving means or swash plate mounted for rotation about an axis at an angle to the axis of the cylinder block and operably connected to the pistons whereby rotation of the driving means reciprocates the pistons and rotates the cylinder block. There is further included a valve plate means within the casing means engagingthe base of the cylinder block and having suitably shaped, generally segmentally shaped, admission and delivery ports adapted to register with ports in the.
  • units 1 and 2 include pistons, one for each unit being respectively shown at 3 and 4.
  • the respective piston rods 5 and 6 are universally connected to, in this instance driving and driven discs or plates 7 and 8, respectively.
  • the connecting conduit means between the high-pressure slots 9, 11 is divided into two lines 13, 14, and the same is done with the connecting conduit means between the lowpressure slots 10, 12, with two lines 15,16 being provided.
  • these lines 13,14 are located infeed connections 17,19 with the supply for the fed medium taking place through inlet conduit 23 and thereafter being connected to connections 17,19 via two one-way or nonreturn valves 21,22.
  • the connections 18,20 for removing the circulating medium are connected between lines 14 and 16 and a flushing valve arrangement 24 in the form of a controllable two-way valve or changeover valve from whence it is discharged via outlet conduit 25.
  • the connecting conduits can be very short in length since it is not necessary to provide for a minimum distance between the hydrounits on account of the arrangement of the connections for feeding and flushing in different lines.
  • the hydrounits are located practically back to back and in which the above-mentioned connections can be located in control or valve plates possessing a certain minimum thickness for reasons of rigidity, or positioned in wall portions adjoining said control or valve plates, as shown in the arrangements illustrated in FIGS. 2-9.
  • FIG. 2 partially illustrates a compact drive embodying two hydrounits 28,29 whose control surfaces are constructed spherically and which represent the delimitation of complementarily shaped valve plate control member 27, the latter containing the connecting conduits and the connections for feeding and flushing.
  • the compact drive according to FIG. 2 includes flanged housing parts 30,31 which are connected to one another by a screw or bolt arrangement, not shown in detail, at locations 32.
  • FIG. 3 the same reference numerals as used in FIG. 1 identify the control slots 11,12, the connecting lines 13-16, and the connections 17-20.
  • Two back pressure valves 33,34 in the form of spring-loaded and stem-guided valves are provided in feed connections 17 and 19, whereas the oil intake takes place through conduit 35.
  • Numeral 36 identifies a chan geover valve which likewise consists of two spring-loaded and stem-guided valves whose guide stem means contact one another so that whichever valve is subjected to high pressure is held closed while the other valve is opened.
  • the oil escapes via conduit 37 and flows back into the reservoir, for example, via a filter and cooler, from where it is sent back as feed oil into the circulation system by a feed pump.
  • hydrounits 28,29 will not be described in greater detail since they are generally known.
  • the instant case deals with two inclined axis, axial piston units in which the drive shaft and the drive plate consist of one piece.
  • FIGS. 4 and 5 show a compact drive with hydrounits 38 and 39 in which the respective units are of different types.
  • Unit 38 represents a so-called inclined plate or disc unit in which the drive shaft and cylinder are rigidly connected to one another, whereas the unit 39 represents a unit of the type referred to in FIG. 2. Since the control member 40 of unit 38 performs slight movements, it cannot be unified into one piece with the rigid control member or valve plate 41.
  • the same reference numerals have been used in FIG. 5 to denote the control slots 11,12 the connecting conduits 13-16, and for the connections 17-20. The difference, as compared with the arrangement of FIG.
  • conduits 17-20 is effected via short connecting ducts 44, 45, 46, 48.
  • FIGS. 6 and 7 illustrate a compact drive in partial view which consists of two so-called inclined plate or disc units. Since the control members or valve plates 50,51 of both units are mounted such as to be movable, the connections 17-20 for feeding and flushing are disposed in a wall 52 of the drive housing. Again, for the purpose of clarity, the reference numerals applicable to the control slots, connecting conduits and connections are the same as in FIG. 1 so that it is not necessary to describe them again. In this arrangement, the flushing valves and the feeding valve are arranged on the outside of the drive housing as in the embodiment of FIGS. 4 and 5, and they are connected to connections 17-20 by corresponding conduits 44, 45 46, 48.
  • connection 19 sufficient space has to be provided for connection 19 so that the housing wall 52 had to be constructed relatively thick, in any event, thicker than would be required if the only consideration had been the load factor.
  • FIGS. 8 and 9 illustrate that a further reduction of the wall thickness of housing wall 52 is possible if the, by and large, easily movable control member or valve plate 53 is used for the intake of the feed oil and for the removal of circulation oil. This is accomplished by providing the connections 17-20 in control member 53.
  • the connecting conduits 55-58 to the valves being provided on the outside ofthe housing, must here be somewhat more yielding in order to prevent them from obstructing the movability of the control member 53.
  • oppositely disposed conduits always have the same pressure, there will not occur any disturbing reaction effect.
  • connection 17-20 are not located exactly in the center of connecting conduits 13-16, the danger of short circuiting between feeding and flushing is absent on account of the arrangement of the respective valves and different lines.
  • the feeding and flushing effect is in each case greater than in the known constructions, and there is furthermore obtained a substantial saving of space.
  • a further advantage is that in hydrounits in which the control member is movably maintained in hydraulic equilibrium, this equilibrium is achieved by a suitable arrangement of and/or dimensioning of the partial lines without making it necessary that the control member be provided with additional support systems.
  • the control member alone can be dimensioned for the occurring loads without having to give consideration for the space requirements of support pistons, thus enabling further coherence of the units.
  • valveless hydrounits are used in all hydrounits, that is to say, not only in compact drives, but also in overdrives, for the prevention of short circuiting between feeding and flushing. Where there are longer connecting conduits, only a part of the conduit need be divided into individual lines for the separate provision of feeding and flushing.
  • a hydrodrive including a fluid-circulating drive system, comprising at least two hydrounits connected by connecting conduit means of which one unit is operable as a hydropump and the other unit is operable as a hydromotor, and a feeding and flushing means for feeding fluid media into and removing fluid media from said circulating drive system, at least one of the connecting conduit means between said hydrounits including at least two lines, and said feeding and flushing means including a feeding connection communicating with one of said lines and a flushing connection communicating with the other of said lines.
  • a hydrodrive as claimed in claim 1 including casing means for said hydrounits, hydrounit control means having a control member, said casing means including a wall portion surrounding said control member and said feeding and flushing connections being disposed in said wall portion.
  • a hydrodrive as claimed in claim 1 including hydrounit control means having a movable control member and said feeding and flushing connections being disposed in said movable control member.
  • a hydrodrive as claimed in claim I and said feeding and flushing connections being disposed at the same distance from the ends of said connecting conduit means.
  • a hydrodrive as claimed in claim 2 and said feeding and flushing connections being disposed at the same distance from the ends of said connecting conduit means.
  • a hydrodrive as claimed in claim 4 and said feeding and flushing connections being disposed at the same distance from the ends of said connecting conduit means.
  • a hydrodrive as claimed in claim 1 including hydrounit control means having at least one control member, said connecting conduit means and said feeding and flushing connections being disposed in said control member and the location of and size of the areas of communication of said connecting conduit means with said connections being such as to maintain said control member in hydraulic equilibrium.
  • a hydrodrive comprising at least two units having a fluid circulating system including at least two conduit means con necting said units and so arranged that one unit is operable as a pump and the other is operable as a motor, means for feeding fluid media into and removing fluid media from said circulating system, at least one of said conduit means comprising at least two lines extending between said units, and said means for feeding fluid into and removing fluid media from said circulating system including a fluid-feeding connection communicating with one of said lines and a fluid-removing connection communicating with the other of said lines.
  • said fluid-feeding connection and fluid-removing connection each communicating with a fluid-accommodating line of at least one of said pairs of fluid-accommodating lines.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Gearings (AREA)
  • Fluid-Pressure Circuits (AREA)
US876907A 1968-11-29 1969-11-14 Hydrodrive Expired - Lifetime US3591965A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1785168A CH479829A (de) 1968-11-29 1968-11-29 Hydrogetriebe

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US3591965A true US3591965A (en) 1971-07-13

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US876907A Expired - Lifetime US3591965A (en) 1968-11-29 1969-11-14 Hydrodrive

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US (1) US3591965A (de)
JP (1) JPS4926207B1 (de)
AT (1) AT304210B (de)
BE (1) BE739448A (de)
CH (1) CH479829A (de)
DE (1) DE1946658A1 (de)
FR (1) FR2024466A1 (de)
GB (1) GB1279107A (de)
NL (1) NL6917972A (de)
SE (1) SE352716B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141216A (en) * 1977-05-20 1979-02-27 Caterpillar Tractor Co. Combination shuttle and high-pressure relief valve
US5095698A (en) * 1989-07-31 1992-03-17 Linde Aktiengesellschaft Hydrostatic transmission
US7111457B1 (en) * 2004-06-12 2006-09-26 Hydro-Gear Limited Partnership Diagnostic system for a hydrostatic transmission or transaxle

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3638890A1 (de) * 1986-07-31 1988-02-04 Hydromatik Gmbh Axial-kolbenmaschine mit einer einrichtung zum spuelen des kreislaufs
WO1995018318A1 (en) * 1993-12-29 1995-07-06 Lomachinsky Vladimir Sofronovi Continuously variable hydraulic differential transmission
US10592064B2 (en) 2013-09-17 2020-03-17 Amazon Technologies, Inc. Approaches for three-dimensional object display used in content navigation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718758A (en) * 1949-07-15 1955-09-27 Borg Warner Variable ratio hydrostatic transmission
US3040532A (en) * 1960-09-12 1962-06-26 Dowty Hydraulic Units Ltd Hydraulic apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718758A (en) * 1949-07-15 1955-09-27 Borg Warner Variable ratio hydrostatic transmission
US3040532A (en) * 1960-09-12 1962-06-26 Dowty Hydraulic Units Ltd Hydraulic apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141216A (en) * 1977-05-20 1979-02-27 Caterpillar Tractor Co. Combination shuttle and high-pressure relief valve
US5095698A (en) * 1989-07-31 1992-03-17 Linde Aktiengesellschaft Hydrostatic transmission
US7111457B1 (en) * 2004-06-12 2006-09-26 Hydro-Gear Limited Partnership Diagnostic system for a hydrostatic transmission or transaxle
US7234300B1 (en) 2004-06-12 2007-06-26 Hydro-Gear Limited Partnership Fastener and valve for a hydraulic apparatus

Also Published As

Publication number Publication date
JPS4926207B1 (de) 1974-07-06
SE352716B (de) 1973-01-08
FR2024466A1 (de) 1970-08-28
NL6917972A (de) 1970-06-02
AT304210B (de) 1972-12-27
BE739448A (de) 1970-03-02
CH479829A (de) 1969-10-15
DE1946658A1 (de) 1970-06-11
GB1279107A (en) 1972-06-28

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