US3523678A - Valve plate for a hydraulic pump or motor - Google Patents

Valve plate for a hydraulic pump or motor Download PDF

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Publication number
US3523678A
US3523678A US712760A US3523678DA US3523678A US 3523678 A US3523678 A US 3523678A US 712760 A US712760 A US 712760A US 3523678D A US3523678D A US 3523678DA US 3523678 A US3523678 A US 3523678A
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United States
Prior art keywords
valve plate
motor
hydraulic pump
pieces
recesses
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Expired - Lifetime
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US712760A
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John Thomas Matthew Wright
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ZF International UK Ltd
Commercial Shearing Inc
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Lucas Industries Ltd
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Assigned to COMMERCIAL SHEARING INC. reassignment COMMERCIAL SHEARING INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LUCAS INDUSTRIES PUBLIC LIMITED COMPANY
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    • 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

Definitions

  • a valve plate for a hydraulic swash plate-type pump or motor is formed in two pieces having aligned apertures therein of differing sizes, to define recesses in the face of the valve plate which is disposed adjacent to the body to accommodate seals.
  • the invention relates to hydraulic pumps or motors of the kind in which there is a body in which is rotatably mounted a rotor having spaced bores containing reciprocable pistons, the body having an inlet and an outlet for liquid to be pumped, there being an apertured valve plate non-rotatably mounted between the body and the rotor through which the liquid can enter and leave the bores in the rotor as the latter rotates, there being recesses surrounding the apertures in the face of the valve plate to accommodate seals disposed between the valve plate and the body.
  • the object of the invention is to provide a valve plate for a hydraulic pump or motor of the kind specified in a convenient form.
  • valve plate for a hydraulic pump or motor of the kind specified is formed in two pieces having aligned apertures therein of differing sizes, the arrangement being such that when the two pieces are placed in juxtaposition, there are defined recesses in the face of the valve plate which is intended to be disposed adjacent to the body and to accommodate the seals.
  • FIG. 1 is a cross-sectional view of a pump incorporating a valve plate constructed in accordance with this invention.
  • FIG. 2 is a front elevation view of a valve plate with sealing members omitted.
  • FIG. 3 is a cross section view on the line 33 in FIG. 2.
  • FIG. 4 is a cross-sectional view on the line 4-4 in FIG. 2.
  • valve plate illustrated is intended for use in a swash plate type pump as shown in FIG. 1 in which there is a body 1 containing a rotatable rotor 2 having a plurality of angularly spaced bores 3, containing respective pistons 4, extending outwardly thereof and into contact with an angularly disposed or disposable swash plate 5 which is non-rotatably mounted within the body 10.
  • a valve plate 10 illustrated in FIGS. 2, 3 and 4.
  • This valve plate 10 has two pairs of generally kidney shaped ports 11, 12 respectively formed therein, and these afford alternate communication between the bores in the rotor 2 and the inlet and the outlet passages 6, 7 as the rotor rotates, to provide passages for the entry and escape of fluid from the rotor bores 3.
  • the valve plate 10 as illustrated in FIGS. 1, 3 and 4, is formed in two separate pieces 10a, 10b, the former being provided With the openings 11, 12, and the latter being provided with larger openings 13, 14 respectively, which are aligned with, and encompass the pairs of openings 11, 12 in the piece 10a of the valve plate.
  • the difference in the sizes of the openings in the pieces 10a, 10b of the valve plate is sufiicient to define respective recesses surrounding the smaller openings 11, 12, and these recesses accommodate respective sealing assemblies comprising two back-to-back L-shaped parts 15, defining between them an opening accommodating a ring 1 6.
  • These assemblies are arranged to abut against the adjacent face of the body and have their edges chamfered as illustrated, so as to provide suitable areas for the pressure balancing of the valve plate whereby it is maintained in a position with respect to the rotor 2 to permit leakage between them for the purpose of lubrication, but in which this leakage is maintained at a practical minimum.
  • two further sealing assemblies comprising, in each case, an L- shaped ring 17 enclosing a sealing member 18.
  • These sealing assemblies are provided in recesses formed in the piece 10a, and abut against the adjacent face of the piece 10b, there being means for supplying fluid under pressure to these recesses in the form of openings 19, which communicate with the bores of the rotor in turn as the latter rotates, to provide pressure balancing of the two pieces of the valve plate.
  • An apertured valve plate for a hydraulic swash platetype machine comprising two flat pieces having aligned similarly shaped apertures therein of different sizes, the References Cited two pieces being placed in juxtaposition to define recesses UNITED STATES PATENTS in one face of the valve plate which is intended to be dispOsed adjacent to a body of the machine, and seals ac- 226,059 3/1880 Glnem 251361 X commodated in these recesses respectively.
  • valve plate as claimed in claim 1 having further ARNOLD ROSENTHAL Primary Examiner seals defined in respective spaces defined between the two 10 US, Cl. X R

Description

Aug. 11, 1970 J. T. M. WRIGHT 3,523,673
VALVE PLATE FOR A HYDRAULIC PUMP OR MOTOR Filed March 13, 1968 2 Sheets-Sheet 1 I ENT'O ATTORNEYS 1970 J. T. M. WRIGHT 3,523,678
VALVE PLATE FOR A HYDRAULIC PUMP OR MOTOR Filed March 13, 1.968 2 Sheets-Sheet 2 ATTORNEYS United -'States Patent Office 3,523,678 Patented Aug. 11, 1970 3,523,678 VALVE PLATE FOR A HYDRAULIC PUMP OR MOTOR John Thomas Matthew Wright, Southport, England,
assiguor to Joseph Lucas (Industries) Limited, Birmingham, England Filed Mar. 13, 1968, Ser. No. 712,760 Int. Cl. F16k 1/34; F04b 21/00 US. Cl. 251-316 3 Claims ABSTRACT OF THE DISCLOSURE A valve plate for a hydraulic swash plate-type pump or motor is formed in two pieces having aligned apertures therein of differing sizes, to define recesses in the face of the valve plate which is disposed adjacent to the body to accommodate seals.
The invention relates to hydraulic pumps or motors of the kind in which there is a body in which is rotatably mounted a rotor having spaced bores containing reciprocable pistons, the body having an inlet and an outlet for liquid to be pumped, there being an apertured valve plate non-rotatably mounted between the body and the rotor through which the liquid can enter and leave the bores in the rotor as the latter rotates, there being recesses surrounding the apertures in the face of the valve plate to accommodate seals disposed between the valve plate and the body.
The object of the invention is to provide a valve plate for a hydraulic pump or motor of the kind specified in a convenient form.
In accordance with the present invention a valve plate for a hydraulic pump or motor of the kind specified is formed in two pieces having aligned apertures therein of differing sizes, the arrangement being such that when the two pieces are placed in juxtaposition, there are defined recesses in the face of the valve plate which is intended to be disposed adjacent to the body and to accommodate the seals.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a cross-sectional view of a pump incorporating a valve plate constructed in accordance with this invention.
FIG. 2 is a front elevation view of a valve plate with sealing members omitted.
FIG. 3 is a cross section view on the line 33 in FIG. 2.
FIG. 4 is a cross-sectional view on the line 4-4 in FIG. 2.
The valve plate illustrated is intended for use in a swash plate type pump as shown in FIG. 1 in which there is a body 1 containing a rotatable rotor 2 having a plurality of angularly spaced bores 3, containing respective pistons 4, extending outwardly thereof and into contact with an angularly disposed or disposable swash plate 5 which is non-rotatably mounted within the body 10. Between the opposite end of the rotor 2 and the adjacent face of the body 1, in which an inlet passage 6 and an outlet passage 7 are provided, is a valve plate 10 illustrated in FIGS. 2, 3 and 4.
This valve plate 10 has two pairs of generally kidney shaped ports 11, 12 respectively formed therein, and these afford alternate communication between the bores in the rotor 2 and the inlet and the outlet passages 6, 7 as the rotor rotates, to provide passages for the entry and escape of fluid from the rotor bores 3.
The valve plate 10, as illustrated in FIGS. 1, 3 and 4, is formed in two separate pieces 10a, 10b, the former being provided With the openings 11, 12, and the latter being provided with larger openings 13, 14 respectively, which are aligned with, and encompass the pairs of openings 11, 12 in the piece 10a of the valve plate.
The difference in the sizes of the openings in the pieces 10a, 10b of the valve plate is sufiicient to define respective recesses surrounding the smaller openings 11, 12, and these recesses accommodate respective sealing assemblies comprising two back-to-back L-shaped parts 15, defining between them an opening accommodating a ring 1 6.
These assemblies are arranged to abut against the adjacent face of the body and have their edges chamfered as illustrated, so as to provide suitable areas for the pressure balancing of the valve plate whereby it is maintained in a position with respect to the rotor 2 to permit leakage between them for the purpose of lubrication, but in which this leakage is maintained at a practical minimum.
As illustrated in FIG. 4, disposed between the two pieces 10a, 10b of the valve plate are disposed two further sealing assemblies comprising, in each case, an L- shaped ring 17 enclosing a sealing member 18. These sealing assemblies are provided in recesses formed in the piece 10a, and abut against the adjacent face of the piece 10b, there being means for supplying fluid under pressure to these recesses in the form of openings 19, which communicate with the bores of the rotor in turn as the latter rotates, to provide pressure balancing of the two pieces of the valve plate. There are further aligned holes 20 in the two pieces 10a, 10b, of the valve plate, through which dowels (not shown) pass into the body to prevent rela tive rotation between the pieces of the valve plate and also between the valve plate and the body.
With this arrangement it is possible to form the openings in the valve plate pieces by relatively inexpensive manufacturing methods such as stamping, and then to fit the pieces together so that the appropriate recesses are defined to receive the sealing assemblies 15, 16, thus avoiding the normal relatively expensive milling operations required to provide these recesses. The recesses to accommodate the sealing assembly 17, 18 are more easily produced, since these are circular instead of kidney shaped as in the case of the openings 11, 12, 13 and 14.
It is to be understood that the invention can also be applied to other forms of pump such as radial piston-type pumps and also to hydraulic motors.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
1. An apertured valve plate for a hydraulic swash platetype machine comprising two flat pieces having aligned similarly shaped apertures therein of different sizes, the References Cited two pieces being placed in juxtaposition to define recesses UNITED STATES PATENTS in one face of the valve plate which is intended to be dispOsed adjacent to a body of the machine, and seals ac- 226,059 3/1880 Glnem 251361 X commodated in these recesses respectively. 2893430 7/1959 Hon 251 316 X 5 2,908,293 10/1959 Johnson 251-317 X sea ls irl 13;; i ni lfli i i iisilierii c mtare ssi iz iiie r z 2969810 1/1961 Dudley 251 283 X bets 3,297,052 1/1967 Robinson 137-625.21
3. A valve plate as claimed in claim 1 having further ARNOLD ROSENTHAL Primary Examiner seals defined in respective spaces defined between the two 10 US, Cl. X R
pieces of the valve plate. 25 l172; 103162
US712760A 1968-03-13 1968-03-13 Valve plate for a hydraulic pump or motor Expired - Lifetime US3523678A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908516A (en) * 1972-05-26 1975-09-30 Twin Disc Inc Timing valve for multipiston hydrostatic engines
US4404895A (en) * 1979-05-18 1983-09-20 Cyphelly Ivan J Fluid pressure unit with hydrostatic torque transmission by roller pistons
EP0661451A1 (en) * 1993-12-08 1995-07-05 Danfoss A/S Control plate for a hydraulic piston machine
US5593285A (en) * 1995-01-13 1997-01-14 Caterpillar Inc. Hydraulic axial piston unit with multiple valve plates
US20070022873A1 (en) * 2005-07-26 2007-02-01 Honeywell International Inc. Wear-resistant port plate for a fluid transfer device and fluid transfer device including same
EP2669516A1 (en) * 2012-05-31 2013-12-04 Messier-Bugatti-Dowty Hydraulic pump with axial pistons
US10408197B2 (en) * 2016-05-26 2019-09-10 Rolls-Royce Plc Axial piston pump/motor
US11555488B2 (en) * 2019-12-19 2023-01-17 Danfoss A/S Valve plate assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US226059A (en) * 1880-03-30 gillette
US2893430A (en) * 1954-09-16 1959-07-07 James W F Holl Noninterflow rotary valve
US2908293A (en) * 1956-06-11 1959-10-13 Delavan Mfg Company Rotary disk valve having a reinforced o-ring seal
US2969810A (en) * 1955-12-27 1961-01-31 Edward C Dudley Wobble plate pump
US3297052A (en) * 1965-04-09 1967-01-10 Eaton Mfg Co Rotary valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US226059A (en) * 1880-03-30 gillette
US2893430A (en) * 1954-09-16 1959-07-07 James W F Holl Noninterflow rotary valve
US2969810A (en) * 1955-12-27 1961-01-31 Edward C Dudley Wobble plate pump
US2908293A (en) * 1956-06-11 1959-10-13 Delavan Mfg Company Rotary disk valve having a reinforced o-ring seal
US3297052A (en) * 1965-04-09 1967-01-10 Eaton Mfg Co Rotary valve

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908516A (en) * 1972-05-26 1975-09-30 Twin Disc Inc Timing valve for multipiston hydrostatic engines
US4404895A (en) * 1979-05-18 1983-09-20 Cyphelly Ivan J Fluid pressure unit with hydrostatic torque transmission by roller pistons
EP0661451A1 (en) * 1993-12-08 1995-07-05 Danfoss A/S Control plate for a hydraulic piston machine
US5593285A (en) * 1995-01-13 1997-01-14 Caterpillar Inc. Hydraulic axial piston unit with multiple valve plates
US20070022873A1 (en) * 2005-07-26 2007-02-01 Honeywell International Inc. Wear-resistant port plate for a fluid transfer device and fluid transfer device including same
EP2669516A1 (en) * 2012-05-31 2013-12-04 Messier-Bugatti-Dowty Hydraulic pump with axial pistons
FR2991400A1 (en) * 2012-05-31 2013-12-06 Messier Bugatti Dowty HYDRAULIC PUMP WITH AXIAL PISTONS
US10408197B2 (en) * 2016-05-26 2019-09-10 Rolls-Royce Plc Axial piston pump/motor
US11555488B2 (en) * 2019-12-19 2023-01-17 Danfoss A/S Valve plate assembly

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Owner name: COMMERCIAL SHEARING INC., 1775 LOGAN AVE., YOUNGST

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LUCAS INDUSTRIES PUBLIC LIMITED COMPANY;REEL/FRAME:004115/0214

Effective date: 19830108