US3756279A - Valve plate body for axial piston device - Google Patents

Valve plate body for axial piston device Download PDF

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Publication number
US3756279A
US3756279A US3756279DA US3756279A US 3756279 A US3756279 A US 3756279A US 3756279D A US3756279D A US 3756279DA US 3756279 A US3756279 A US 3756279A
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US
United States
Prior art keywords
plate body
valve plate
layer
disks
valve
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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
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English (en)
Inventor
D Widmaier
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3756279A publication Critical patent/US3756279A/en
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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
    • F04B1/2042—Valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86638—Rotary valve

Definitions

  • Valve plate body for axial piston device comprising at least two superimposed rigid discs, each having valve [52] US. Cl 137/625.21, 277/233, 91/180, openings, and one layer of resilient material between 308/160'251/304 each adjacent pair of superimposed rigid discs, said [51] Int. Cl. Flfik 11/02 layer of resilient material being thinner than each of [58] Field of Search 251/304; 308/160;
  • Valve plate bodies are well known, their use in axial piston machines being for instance described in US. Pat. No. 3,1 31,605, entitled Flat Valve for Hydraulic Machine.
  • valve plates are subjected to varying forces, temperature fluctuations and above all, temperature differences in different portions thereof; these factors give rise to forces which in turn lead to deformations of the system.
  • the deformations or dislocations result in gaps between the cylinder valve and the valve plate on the one hand, and between these components and the supporting housing of the machine on the other hand. As a consequence, there is considerable leakage and the efficiency of the machine suffers thereby.
  • this objective is achieved by providing a valve plate body comprised of at least two rigid discs and, between each pair of adjoining rigid discs, a firmly attached layer of flexible material which surrounds at least the valve openings of the valve plates and is thinner than the discs of rigid material.
  • valve plate body is elastically deformable in theaxial direction, and as a result the above-mentioned deformations are diverted at least in part into portions of the valve plate body which are not located at the contact surfaces. In this way the formation of gaps is effectively avoided, and leakage is very substantially reduced.
  • a further advantage of thevalve plate body in accordance with the present invention results from the fact that elasticity is needed over the entire region rather than merely in certain zones.
  • the flexibility of the system can be increased by making it of several alternating rigid and elastic layers.
  • Constructions in accordance with the present invention are particularly suitable for machines which must operate at very high hydraulic pressures.
  • the elastic layers must be relatively thin in order not to be pressed outwardly by the pressure from the control slots.
  • FIG. 1 shows a cross section through a valve plate body
  • FIG. 1a is a plan view of a valve plate body
  • FIGS. 2, 3 and 4 are sectional views through variations of constructions in accord with the present invention.
  • FIG. 5 is a perspective view of another form of the invention.
  • FIG. 6 is a sectional view through a modification similar to that shown in FIG. 1.
  • the valve plate body of the construction variation shown in FIG. 1 consists of an upper rigid disc 1 and a lower rigid disc 2 which are superimposed on each other. Between the two opposing faces of the discs is a layer 3 of a resilient material, such as rubber, polytetrafiuoroethylene or another suitable elastomer. This elastic layer is firmly attached to the adjacent faces of the rigid layers by means such as cementing, and in the case of rubber by vulcanization.
  • the layer 3 which, for example, may be in the form of a disc, is thinner than the layers of rigid material; this will be discussed in more detail below.
  • Theassembly prepared in this way constitutes a valve plate body which can be taken apart only with difficulty; the construction offers substantial resistance to turning of one rigid plate with respect to another.
  • a pin 4 is provided which passes through the upper disc I by means of a clearance hole and which seats in a blind hole in the lower disc 2..
  • the usual through-going con-- trol slots 5 and 6 are'provided in the valve plate body.
  • valve plate body is mounted in a housing 7 of the axial piston machine which is indicated by the dash and dot lines. 0n the lower side of the valve plate body, that is, the lower end face of the disc 2, which is turned away from the flexible disc 3, rotates the cylinder barrel 8 of the axial piston device. It is desirable that the rigid disc 2 be made of a material with good anti-friction properties, such as bronze or brass.
  • the axial piston machine strains are produced in the valve plate body as for example as a result of unequal temperature rise in various parts of the valve plate body.
  • the temperature of the oil used as the hydraulic medium is higher at the output side of the valve plate body than at the intake side.
  • the frictional forces originatingin the rotation of the cylinder barrels against the valve plate body cause a greater temperature rise at the periphery than at the internal portionssince the rate of rotation is greater at the outer portions.
  • the various forces operating on the valve plate body are unequally distributed and oriented. All of these forces give rise to deformations of the valve plate body as a result of which small gaps between the contact surfaces arise which lead to undesired leakage of oil. The efficiency of the device is thereby lowered.
  • Valve plate bodies made in accordance with the present invention avoid these difficulties for the most part in the region of the resilient layer 3; in this region the resilient layer 3 accommodates the forces substantially completely.
  • the contact surfaces remain more even than has been the case with previous valve plate bodies, in addition to which formation of gaps is minimized and the leakage of oil is strongly decreased.
  • the elastic material In axial piston devices which operate at very high pressures, the elastic material must be as thin as possible in the region of the valve slots; a desirable thickness is about 1 mm. Otherwise, under certain circumstances, there arises the danger that the layer 3 will be pressed out by the pressure forces of the hydraulic medium. Since the gaps which result from the deformations are very thin, somewhat in the neighborhood of tenths of a millimeter, the layer 3 can be completely retained.
  • valve plate bodies shown in FIG. 2 consist of an upper rigid disc and a lower rigid disc 11. Starting at the outer periphery and extending inward to a point exterior to the slot 5. each of the discs 10 and 11 has a recessed portion, respectively, 12 and 13. The rigid discs 10 and 11 are so oriented that the recessed portions face each other thus forming a circumferential groove.
  • the resilient layer 14 is so shaped that it fills the circumferential grooves between the two rigid discs. As a result, the outer zone of the system is more elastic than inner zones.
  • FIG. 3 A similar arrangement is shown in the embodiment of FIG. 3.
  • the lower rigid disc 3 is constructed exactly as in the example of FIG. 1, while the upper layer 15 external to the valve slot 5' has a bevel 16, which is so arranged that the thickness of the disc 15 decreases outwardly.
  • Theresilient layer 17 again fills the entire groove.
  • the valve plate body according to the example of FIG. 4 consists of a stack of a larger number of rigid discs 18-21. Between each pair of discs is disposed a layer 22 of the type shown in the embodiment of FIG. 1.
  • the resilient layer may be a disc or a segment of a disc.
  • a stationary valve plate body for an axial piston device comprising two superimposed rigid disks, each having valve openings; and a layer of resilient material between said superimposed rigid disks and at least surrounding said valve openings, at least one of said rigid disks being thinner in the region of said disk between its outer periphery and the adjacent valve opening so that the space between said disk is wider in said thinner region of said one disk than in the remaining regions of said one disk, said space between said disks about said valve openings being filled by said layer of resilient material and the portion of said layer between said remaining regions of said one disk and the other disk being thinner than each of said disks in the region of the thinner region thereof.
  • a stationary valve plate body for an axial piston device comprising a stack of superimposed rigid disks, each having valve openings aligned with the valve openings in the other of said stack of disks; and a layer of resilient material between each adjacent pair of superimposed rigid disks, said layer of resilient material being thinner than each of said rigid disks and at least surrounding said openings.
  • valve plate body as defined in claim 3, wherein each layer of resilient material is of uniform thickness.
  • Valve plate body as defined in claim 3, wherein said layers of resilient material correspond in size and configuration to the end faces of respectively adjacent one of said rigid discs.
  • Valve plate body as defined in claim 8 wherein said material having good anti-friction properties is selected from the group consisting of bronze and brass.
  • valve plate body as defined in claim 3 wherein said valve openings comprise two diametrically opposite arcuate slots having the same center and equal radii of curvature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
  • Multiple-Way Valves (AREA)
  • Rolls And Other Rotary Bodies (AREA)
US3756279D 1970-07-11 1970-12-24 Valve plate body for axial piston device Expired - Lifetime US3756279A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702034501 DE2034501A1 (de) 1970-07-11 1970-07-11 Steuerspiegelkörper für Axialkolbenmaschine

Publications (1)

Publication Number Publication Date
US3756279A true US3756279A (en) 1973-09-04

Family

ID=5776499

Family Applications (1)

Application Number Title Priority Date Filing Date
US3756279D Expired - Lifetime US3756279A (en) 1970-07-11 1970-12-24 Valve plate body for axial piston device

Country Status (6)

Country Link
US (1) US3756279A (de)
JP (1) JPS503201B1 (de)
CH (1) CH528009A (de)
DE (1) DE2034501A1 (de)
FR (1) FR2101549A5 (de)
GB (1) GB1301708A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489950A (en) * 1983-05-25 1984-12-25 Ferrofluidics Corporation Ferrofluid-pole-piece-magnet apparatus
US4793375A (en) * 1987-07-16 1988-12-27 Masco Corporation Of Indiana Faucet valve cartridge
US5582415A (en) * 1993-08-31 1996-12-10 Kokusan Parts Industry Co., Ltd. Metal gasket
US5938208A (en) * 1994-12-30 1999-08-17 Kokusan Parts Industry Co., Ltd. Separate plate placed between adjacent valve bodies in a control valve unit of an automatic transmission
US11555488B2 (en) * 2019-12-19 2023-01-17 Danfoss A/S Valve plate assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449898A (en) * 1982-06-07 1984-05-22 Vickers, Incorporated Power transmission
JPS5958609U (ja) * 1982-10-14 1984-04-17 住友ゴム工業株式会社 安全タイヤ用中子
DE102006037593A1 (de) * 2006-08-11 2008-02-14 Robert Bosch Gmbh Axialkolbenmaschine mit schallgedämpfter und/oder schallgedämmter Steuerplatte

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2218034A (en) * 1936-04-23 1940-10-15 Firm Carbobronze Rohrenwerk Ge Bearing
US2807280A (en) * 1953-07-20 1957-09-24 Arthur E Kittredge Program control valve
US3056426A (en) * 1960-10-21 1962-10-02 Hauser Fred Distributors
US3131605A (en) * 1963-01-14 1964-05-05 Oilgear Co Flat valve for hydraulic machine
US3302528A (en) * 1965-03-16 1967-02-07 Lionel H Rosenhaft Twin compression chamber motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2218034A (en) * 1936-04-23 1940-10-15 Firm Carbobronze Rohrenwerk Ge Bearing
US2807280A (en) * 1953-07-20 1957-09-24 Arthur E Kittredge Program control valve
US3056426A (en) * 1960-10-21 1962-10-02 Hauser Fred Distributors
US3131605A (en) * 1963-01-14 1964-05-05 Oilgear Co Flat valve for hydraulic machine
US3302528A (en) * 1965-03-16 1967-02-07 Lionel H Rosenhaft Twin compression chamber motor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489950A (en) * 1983-05-25 1984-12-25 Ferrofluidics Corporation Ferrofluid-pole-piece-magnet apparatus
US4793375A (en) * 1987-07-16 1988-12-27 Masco Corporation Of Indiana Faucet valve cartridge
US5582415A (en) * 1993-08-31 1996-12-10 Kokusan Parts Industry Co., Ltd. Metal gasket
US5938208A (en) * 1994-12-30 1999-08-17 Kokusan Parts Industry Co., Ltd. Separate plate placed between adjacent valve bodies in a control valve unit of an automatic transmission
US11555488B2 (en) * 2019-12-19 2023-01-17 Danfoss A/S Valve plate assembly

Also Published As

Publication number Publication date
JPS503201B1 (de) 1975-02-01
CH528009A (de) 1972-09-15
FR2101549A5 (de) 1972-03-31
GB1301708A (de) 1973-01-04
DE2034501A1 (de) 1972-01-27

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