US2722890A - Swash plate pump - Google Patents
Swash plate pump Download PDFInfo
- Publication number
- US2722890A US2722890A US432574A US43257454A US2722890A US 2722890 A US2722890 A US 2722890A US 432574 A US432574 A US 432574A US 43257454 A US43257454 A US 43257454A US 2722890 A US2722890 A US 2722890A
- Authority
- US
- United States
- Prior art keywords
- port
- delivery
- swash plate
- pump
- plungers
- 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
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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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/24—Bypassing
-
- 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
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
- F04B1/126—Piston shoe retaining means
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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
- F04B1/14—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 stationary cylinders
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- 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
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7781—With separate connected fluid reactor surface
- Y10T137/7832—Plural valves biased closed
Definitions
- SWASH PLATE PUMP Filed May 26, 1954 III II 1A 13 i E 1a 21 6- .21 2 $14 United States Patent Ofiice SWASH PLATE PUMP Ren Lucien, Paris, France, assignor to Societe dlnventions Aerouaumes et Mecaniques S. I. A. M., Fribourg, Switzerland, a corporation of Switzerland Application May 26, 1954-, Serial No. 432,574 Claims priority, application France November 6, 1953 2 Claims. (Cl. lul -42) This invention comprises improvements in swash plate pumps.
- plungers are movable in cylinders with which they form individual pumps and are actuated by a swash plate rotating relatively to the plungers about a central axis and inclined to said axis, the said plungers being returned by means of one or more springs.
- the present invention comprises a swash plate pump of a particularly simple construction, having the following characteristics:
- One or more ports are provided in the walls of the cylinders which are normally closed by an auxiliary piston valve subject at one end to the delivery pressure and at the other to the opposing action of a spring, these ports being uncovered by said piston valve when the pressure exceeds a limiting value and then bring the cylinders into communication with a return port to the suction side of the pump, thus ensuring automatic regulation as a function of the delivery pressure.
- Figure 1 is a longitudinal section through the axis of the driving shaft of the pump.
- Figure 2 is a detail of a modification.
- the body 1 of the pump comprises two compartments 2 and 3 provided respectively with a suction port 4 and a delivery port 5, the compartment 3 also having a port 6 in communication with the suction reservoir from which the port 4 draws.
- cylinders 7 Round the chamber 3 and equidistant from the axis of the pump are arranged a number of cylinders 7 (of which only one appears in the drawing) in which are plungers 8, each having a head 13 at one end and a cylindrical cavity 9 at the other end, the latter communicating with the side of the plunger through a transverse port 10.
- a swash plate 11 is rigidly secured to a driving shaft 12 and inclined in relation thereto.
- the swash plate bears on the heads 13 of the plungers, which have a suitably convex profile.
- a plate 14 supported by a rod 15 forming an extension of the shaft 12, engages behind the heads of the plungers; it contains orifices 16 through which the plungers pass.
- the plate 14 is supported on the rod 15 by means of a ball joint member 17 and flange 18 and it is machined in the centre so as to have a spherical surface of the same diameter as the ball member 17.
- the spherical portion of 2,722,890 Patented Nov. 8, 1955 the plate 14 has suflicient clearance at the top to permit it to oscillate about the centre of the sphere to the extent required by the stroke of the plungers.
- each plunger makes a corresponding reciprocating movement in its cylinder, being urged downwards by the plate 11 and urged back in the opposite direction by the plate 14.
- a differential piston valve 21 In the chamber 3 there is housed a differential piston valve 21, the stem of which is hollow and the head of which is pierced by a port 22. It follows that the delivery pressure obtaining in the chamber 3 urges the valve 21 downwards against the pressure of a spring 23. When the delivery pressure exceeds a certain limit, the valve 21, compressing the spring, opens relief ports 24 provided in the wall which separates the chamber 3 from the cylinder bores 7. The latter are then brought into communication with the return port 6 to the reservoir. The individual pumps are thus wholly or partially by-passed and no longer deliver fully to the delivery circuit through port 5, until the pressure has dropped in the delivery pipe. The passage from one state to the other takes place gradually, the ports 24 being small, and uncovered or covered progressively.
- the rod 15 instead of being rigidly secured to the shaft 12, is mounted to slide thereon and is urged upwards by a spring 25.
- This arrangement enables the plate 14 to oscillate even if a piston refuses to rise completely in its return stroke, as a result of seizure. The risk of fracture or deformation under abnormal loads is thus avoided.
- a pump comprising a pump body having a plurality of separate pump cylinder bores, a pumping plunger in each of said bores, an admission chamber for the fluid to the said cylinder bores, an admission port thereto, a delivery chamber for fluid from the cylinder bores having a delivery port therefrom, a valve bore in said delivery chamber, a piston valve movable therein, a spring acting on one face of said piston valve; means to admit on the other face the pressure in the delivery chamber; an outlet port for the fluid in said valve bores; in the wall of each of the said cylinder bores at least one relief port between said cylinder bore and said valve bore, said relief ports being closed by said piston valve with the compression of said spring less than a predetermined value and being opened above said value.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Description
Nov. 8, 1955 LUCIEN 2,722,890
SWASH PLATE PUMP Filed May 26, 1954 III II 1A 13 i E 1a 21 6- .21 2 $14 United States Patent Ofiice SWASH PLATE PUMP Ren Lucien, Paris, France, assignor to Societe dlnventions Aerouautiques et Mecaniques S. I. A. M., Fribourg, Switzerland, a corporation of Switzerland Application May 26, 1954-, Serial No. 432,574 Claims priority, application France November 6, 1953 2 Claims. (Cl. lul -42) This invention comprises improvements in swash plate pumps.
Numerous embodiments of pumps of this type are known, in which plungers are movable in cylinders with which they form individual pumps and are actuated by a swash plate rotating relatively to the plungers about a central axis and inclined to said axis, the said plungers being returned by means of one or more springs.
Attempts have also been made to make such pumps in which the delivery is automatically dependent on the pressure in the delivery pipe of the pump.
The present invention comprises a swash plate pump of a particularly simple construction, having the following characteristics:
1. One or more ports are provided in the walls of the cylinders which are normally closed by an auxiliary piston valve subject at one end to the delivery pressure and at the other to the opposing action of a spring, these ports being uncovered by said piston valve when the pressure exceeds a limiting value and then bring the cylinders into communication with a return port to the suction side of the pump, thus ensuring automatic regulation as a function of the delivery pressure.
2. Return movement of the plungers, after their delivery stroke, is brought about, not by the intervention of springs but by an oscillating plate, mounted by a ball-and-socket joint on a rod forming an extension of the driving shaft, which plate engages abutments behind the plunger heads.
One embodiment of the invention will now be described by way of example, reference being made to the accompanying drawings, in which:
Figure 1 is a longitudinal section through the axis of the driving shaft of the pump; and
Figure 2 is a detail of a modification.
Referring to Figure 1, the body 1 of the pump comprises two compartments 2 and 3 provided respectively with a suction port 4 and a delivery port 5, the compartment 3 also having a port 6 in communication with the suction reservoir from which the port 4 draws.
Round the chamber 3 and equidistant from the axis of the pump are arranged a number of cylinders 7 (of which only one appears in the drawing) in which are plungers 8, each having a head 13 at one end and a cylindrical cavity 9 at the other end, the latter communicating with the side of the plunger through a transverse port 10.
A swash plate 11 is rigidly secured to a driving shaft 12 and inclined in relation thereto. The swash plate bears on the heads 13 of the plungers, which have a suitably convex profile. A plate 14 supported by a rod 15 forming an extension of the shaft 12, engages behind the heads of the plungers; it contains orifices 16 through which the plungers pass.
The plate 14 is supported on the rod 15 by means of a ball joint member 17 and flange 18 and it is machined in the centre so as to have a spherical surface of the same diameter as the ball member 17. The spherical portion of 2,722,890 Patented Nov. 8, 1955 the plate 14 has suflicient clearance at the top to permit it to oscillate about the centre of the sphere to the extent required by the stroke of the plungers.
Each time the shaft 12 rotates, each plunger makes a corresponding reciprocating movement in its cylinder, being urged downwards by the plate 11 and urged back in the opposite direction by the plate 14.
If one of the plungers 8 is assumed to be in its uppermost position as shown in Figure 1, then the liquid enters the cylinder 7 of said plunger through the port 10. The plate 11, as it turns, forces the plunger down into the cylinder, thus closing the port 10. Thus put under pressure, the liquid causes the opening of a valve 19 against the action of the spring 20; the pumped liquid passes through the chamber 3 and leaves by the delivery port 5. All the plungers act in the same manner as the plate 11 rotates.
Automatic regulation of the delivery is ensured in the following manner:
In the chamber 3 there is housed a differential piston valve 21, the stem of which is hollow and the head of which is pierced by a port 22. It follows that the delivery pressure obtaining in the chamber 3 urges the valve 21 downwards against the pressure of a spring 23. When the delivery pressure exceeds a certain limit, the valve 21, compressing the spring, opens relief ports 24 provided in the wall which separates the chamber 3 from the cylinder bores 7. The latter are then brought into communication with the return port 6 to the reservoir. The individual pumps are thus wholly or partially by-passed and no longer deliver fully to the delivery circuit through port 5, until the pressure has dropped in the delivery pipe. The passage from one state to the other takes place gradually, the ports 24 being small, and uncovered or covered progressively.
In the modification illustrated in Figure 2, the rod 15, instead of being rigidly secured to the shaft 12, is mounted to slide thereon and is urged upwards by a spring 25. This arrangement enables the plate 14 to oscillate even if a piston refuses to rise completely in its return stroke, as a result of seizure. The risk of fracture or deformation under abnormal loads is thus avoided.
We claim:
1. A pump comprising a pump body having a plurality of separate pump cylinder bores, a pumping plunger in each of said bores, an admission chamber for the fluid to the said cylinder bores, an admission port thereto, a delivery chamber for fluid from the cylinder bores having a delivery port therefrom, a valve bore in said delivery chamber, a piston valve movable therein, a spring acting on one face of said piston valve; means to admit on the other face the pressure in the delivery chamber; an outlet port for the fluid in said valve bores; in the wall of each of the said cylinder bores at least one relief port between said cylinder bore and said valve bore, said relief ports being closed by said piston valve with the compression of said spring less than a predetermined value and being opened above said value.
2. A pump as claimed in claim 1 in which the said piston valve is a differential piston valve having a larger face exposed to the action of the pressure of the fluid in the delivery chamber and a smaller face exposed to said pressure and the action of said spring.
References Cited in the file of this patent UNITED STATES PATENTS
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2722890X | 1953-11-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2722890A true US2722890A (en) | 1955-11-08 |
Family
ID=9688219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US432574A Expired - Lifetime US2722890A (en) | 1953-11-06 | 1954-05-26 | Swash plate pump |
Country Status (1)
Country | Link |
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US (1) | US2722890A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2821926A (en) * | 1954-06-28 | 1958-02-04 | Cessna Aircraft Co | Variable volume reciprocating pump |
US2842068A (en) * | 1954-10-05 | 1958-07-08 | Sundin Eric Olov | Piston pump |
US2936633A (en) * | 1956-07-31 | 1960-05-17 | British Messier Ltd | Swasplate cam follower rod |
US2962971A (en) * | 1956-07-02 | 1960-12-06 | Vickers Inc | Power transmission |
DE1095670B (en) * | 1956-11-06 | 1960-12-22 | Integral Ltd | Liquid pump |
US3236189A (en) * | 1962-11-09 | 1966-02-22 | Bank Monticello State | Variable delivery piston pump |
US5307731A (en) * | 1992-11-19 | 1994-05-03 | Sauer Inc. | Housing system for hydraulic units |
US5540563A (en) * | 1994-09-16 | 1996-07-30 | Sauer Inc. | Unitary housing for double hydraulic unit |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2069651A (en) * | 1935-02-18 | 1937-02-02 | Oilgear Co | Pump or motor |
US2457339A (en) * | 1946-08-31 | 1948-12-28 | Bertea Alex | Wobble plate pump |
US2470583A (en) * | 1944-05-22 | 1949-05-17 | American Steel Foundries | Relief valve control system |
US2534153A (en) * | 1946-03-11 | 1950-12-12 | Schweizerische Lokomotiv | Axial cylinder pump especially intended for moving liquids |
US2672095A (en) * | 1949-08-06 | 1954-03-16 | Siam | High-pressure hydraulic pump |
-
1954
- 1954-05-26 US US432574A patent/US2722890A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2069651A (en) * | 1935-02-18 | 1937-02-02 | Oilgear Co | Pump or motor |
US2470583A (en) * | 1944-05-22 | 1949-05-17 | American Steel Foundries | Relief valve control system |
US2534153A (en) * | 1946-03-11 | 1950-12-12 | Schweizerische Lokomotiv | Axial cylinder pump especially intended for moving liquids |
US2457339A (en) * | 1946-08-31 | 1948-12-28 | Bertea Alex | Wobble plate pump |
US2672095A (en) * | 1949-08-06 | 1954-03-16 | Siam | High-pressure hydraulic pump |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2821926A (en) * | 1954-06-28 | 1958-02-04 | Cessna Aircraft Co | Variable volume reciprocating pump |
US2842068A (en) * | 1954-10-05 | 1958-07-08 | Sundin Eric Olov | Piston pump |
US2962971A (en) * | 1956-07-02 | 1960-12-06 | Vickers Inc | Power transmission |
US2936633A (en) * | 1956-07-31 | 1960-05-17 | British Messier Ltd | Swasplate cam follower rod |
DE1095670B (en) * | 1956-11-06 | 1960-12-22 | Integral Ltd | Liquid pump |
US3236189A (en) * | 1962-11-09 | 1966-02-22 | Bank Monticello State | Variable delivery piston pump |
US5307731A (en) * | 1992-11-19 | 1994-05-03 | Sauer Inc. | Housing system for hydraulic units |
US5540563A (en) * | 1994-09-16 | 1996-07-30 | Sauer Inc. | Unitary housing for double hydraulic unit |
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