US3518919A - Radial piston pumps - Google Patents
Radial piston pumps Download PDFInfo
- Publication number
- US3518919A US3518919A US810924A US3518919DA US3518919A US 3518919 A US3518919 A US 3518919A US 810924 A US810924 A US 810924A US 3518919D A US3518919D A US 3518919DA US 3518919 A US3518919 A US 3518919A
- Authority
- US
- United States
- Prior art keywords
- rotor
- ring
- body part
- axis
- pistons
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0452—Distribution members, e.g. valves
- F04B1/0465—Distribution members, e.g. valves plate-like
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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
- 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
- F04B49/12—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 varying the length of stroke of the working members
- F04B49/123—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 varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
- F04B49/128—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 varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the cylinders, e.g. by moving a cylinder block
-
- 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
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/06—Control
- F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
Definitions
- a pump comprising a body part containing a rotor with radially reciprocable pistons in bores thereof, a ring against an internal surface of which the pistons bear, an inlet and an outlet for liquid to be pumped and a part between an apertured side face of the rotor and the portion of the body part in which the outlet is formed, said part having a port through which liquid flows from the bores, to the outlet and said part being disposed so that the port occupies a plane which is inclined to the line of action of the biasing means.
- the invention relates to liquid pumps of the kind including a rotor supporting a plurality of radially reciprocable pistons, the pistons engaging a surface which, for the purpose of pumping liquid, is eccentric with respect to the axis of rotation of the rotor, said rotor being mounted within a body part in which are defined inlet and outlet ducts for the liquid.
- FIG. 1 is a side elevation cross-sectional view of a pump constructed in accordance with the invention.
- FIG. 2 is a view of one interior end face of the pump with the rotor and pistons omitted.
- the pump illustrated has a body part incorporating a detachable end cover 11 at one end.
- a cavity 12 within which is rotatably mounted a rotor 13.
- the rotor 13 has a plurality of radially extending bores 14 containing respective pistons 15.
- Slippers 16 incorporated in the outer ends of the pistons bear against the internal surface of a ring 17 mounted in the body part 10.
- the internal surface of the ring 17 is part-spherical.
- the rotor 13 has an integral tubular driving shaft 18 extending out of the body part 10 at its end remote from the end cover 11, and this shaft 18 is mounted in a hearing 19 in the body part 10.
- a coiled compression spring 20 arranged to urge the ring 17 towards a position (illustrated in FIG. 1) in which the ring and rotor are eccentric with respect to one another.
- the side face of the rotor 13 adjacent to the end cover 11 is provided with a plurality of holes 21 communicating with the bores 14 respectively.
- the body part 10 has an inlet 22 and the end cover 11 has an outlet 23 for liquid to be pumped.
- a part 24 in which is formed a kidney shaped port 25 affording communication between the holes 21 in the rotor 13 and the outlet 23.
- This part 24 is shown in FIG. 2 and remains stationary when the rotor is rotating. Inlet to the bores 14 through the holes 21 occurs as the rotor rotates when they are out of contact with the part 24.
- the part 24 is symmetrical about a plane which is identified 'by numeral 26, this plane passing ice through the axis of rotation of the rotor which is identified by numeral 27.
- This plane is inclined to the axis of the spring 20 (identified by numeral 28) which also passes through the axis 27.
- the off-set position of the part 24 changes the direction of the resultant force mentioned from that which exists if the plane 26 is perpendicular to the axis 28 of the spring 20.
- the resultant force acts instead in a direction away from a point of contact between the exterior of the ring 17 and the interior cylindrical surface of the cavity 12 of the body part 10.
- the ring 17 is constrained to move against the action of the spring towards a position in which axes of the ring and rotor are truely coincident.
- the sides of the cavity 12 may includes parallel straight portions parallel to the axis 28 these portions guiding the ring 17.
- a roller is incorporated into the wall of the cavity 12 to form a fulcrum about which the ring will move.
- the spring 20 is replaced by a diamond shaped blade spring, the line of action of this however, being identified by the plane 28 in the FIG. 2 construction.
- a radial piston type pum comprising a body part, an inlet and an outlet in the body part for liquid, a rotor mounted in the body part for rotation about an axis, a plurality of pistons occupying radially extending bores in the rotor respectively, a ring disposed within the body part, said ring providing an internal surface against which the outer ends of the pistons bear, biasing means acting between the body part and said ring having an axis passing through the axis of rotation of the rotor, the biasing means urging the ring towards a position in which said surface thereon is eccentric with respect to the axis of rotation of the rotor, axially extending holes in the side of the rotor, said holes communicating with the inner ends of the bores respectively, and a port plate disposed between said side of the rotor and the body part, the port plate having a port affording communication between the holes in the rotor in turn as the rotor rotates and the outlet in the body part, said port plate being
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
u y 7, 1970 F. 5. FREEMAN 3,518,919
RADIAL PISTON PUMPS Original Filed Jan. 22, 1968 INVE NTOR ATTORNEYS United States Patent US. Cl. 91475 1 Claim ABSTRACT OF THE DISCLOSURE A pump comprising a body part containing a rotor with radially reciprocable pistons in bores thereof, a ring against an internal surface of which the pistons bear, an inlet and an outlet for liquid to be pumped and a part between an apertured side face of the rotor and the portion of the body part in which the outlet is formed, said part having a port through which liquid flows from the bores, to the outlet and said part being disposed so that the port occupies a plane which is inclined to the line of action of the biasing means.
This application is a continuation application of application 699,680 filed Jan. 22, 1968, now abandoned.
The invention relates to liquid pumps of the kind including a rotor supporting a plurality of radially reciprocable pistons, the pistons engaging a surface which, for the purpose of pumping liquid, is eccentric with respect to the axis of rotation of the rotor, said rotor being mounted within a body part in which are defined inlet and outlet ducts for the liquid.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a side elevation cross-sectional view of a pump constructed in accordance with the invention, and
FIG. 2 is a view of one interior end face of the pump with the rotor and pistons omitted.
The pump illustrated has a body part incorporating a detachable end cover 11 at one end. Within the body part is defined a cavity 12 within which is rotatably mounted a rotor 13. The rotor 13 has a plurality of radially extending bores 14 containing respective pistons 15. Slippers 16 incorporated in the outer ends of the pistons bear against the internal surface of a ring 17 mounted in the body part 10. The internal surface of the ring 17 is part-spherical.
The rotor 13 has an integral tubular driving shaft 18 extending out of the body part 10 at its end remote from the end cover 11, and this shaft 18 is mounted in a hearing 19 in the body part 10.
Acting against the ring 17 is a coiled compression spring 20 arranged to urge the ring 17 towards a position (illustrated in FIG. 1) in which the ring and rotor are eccentric with respect to one another.
The side face of the rotor 13 adjacent to the end cover 11 is provided with a plurality of holes 21 communicating with the bores 14 respectively. The body part 10 has an inlet 22 and the end cover 11 has an outlet 23 for liquid to be pumped.
Between the end cover 11 and the adjacent end of the rotor 13 is a part 24 in which is formed a kidney shaped port 25 affording communication between the holes 21 in the rotor 13 and the outlet 23.
This part 24 is shown in FIG. 2 and remains stationary when the rotor is rotating. Inlet to the bores 14 through the holes 21 occurs as the rotor rotates when they are out of contact with the part 24.
As shown in FIG. 2 the part 24 is symmetrical about a plane which is identified 'by numeral 26, this plane passing ice through the axis of rotation of the rotor which is identified by numeral 27. This plane is inclined to the axis of the spring 20 (identified by numeral 28) which also passes through the axis 27.
In use, there exists a force which is the resultant of the forces applied by the pistons 15 to the ring 17, this resultant force tending to move the ring towards a position in which the ring 17 and rotor 13 having their axes substantially coincident. Movement under the action of this force takes place against the spring 20 and only occurs when the value of the force in the plane of the spring axis exceeds the spring rating.
The off-set position of the part 24 changes the direction of the resultant force mentioned from that which exists if the plane 26 is perpendicular to the axis 28 of the spring 20. The resultant force acts instead in a direction away from a point of contact between the exterior of the ring 17 and the interior cylindrical surface of the cavity 12 of the body part 10.
The ring 17 is constrained to move against the action of the spring towards a position in which axes of the ring and rotor are truely coincident. The sides of the cavity 12 may includes parallel straight portions parallel to the axis 28 these portions guiding the ring 17.
Alternatively a roller is incorporated into the wall of the cavity 12 to form a fulcrum about which the ring will move.
In a further alternative, the spring 20 is replaced by a diamond shaped blade spring, the line of action of this however, being identified by the plane 28 in the FIG. 2 construction.
I claim:
1. A radial piston type pum comprising a body part, an inlet and an outlet in the body part for liquid, a rotor mounted in the body part for rotation about an axis, a plurality of pistons occupying radially extending bores in the rotor respectively, a ring disposed within the body part, said ring providing an internal surface against which the outer ends of the pistons bear, biasing means acting between the body part and said ring having an axis passing through the axis of rotation of the rotor, the biasing means urging the ring towards a position in which said surface thereon is eccentric with respect to the axis of rotation of the rotor, axially extending holes in the side of the rotor, said holes communicating with the inner ends of the bores respectively, and a port plate disposed between said side of the rotor and the body part, the port plate having a port affording communication between the holes in the rotor in turn as the rotor rotates and the outlet in the body part, said port plate being disposed symmetrically about a plane passing through the axis or rotation of the rotor and being inclined with respect to the axis of the biasing means which also passes through the axis of rotation of the rotor.
References Cited UNITED STATES PATENTS 2,429,011 10/ 1947 Wylie.
2,518,578 8/1950 Tomlinson.
2,716,945 9/ 1955 Presnell.
2,797,643 7/1957 Sherman 103-161 X 2,871,797 2/ 1959 Bourassa.
3,064,583 11/1962 Burt.
3,096,723 7/ 1963 Puryear.
WILLIAM L. FREEH, Primary Examiner US. Cl. X.R. 91491
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US81092469A | 1969-03-24 | 1969-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3518919A true US3518919A (en) | 1970-07-07 |
Family
ID=25205053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US810924A Expired - Lifetime US3518919A (en) | 1969-03-24 | 1969-03-24 | Radial piston pumps |
Country Status (1)
Country | Link |
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US (1) | US3518919A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3758899A (en) * | 1970-12-18 | 1973-09-18 | Lucas Industries Ltd | Rotary hydraulic machines |
US3788779A (en) * | 1971-05-27 | 1974-01-29 | F Carlson | Radial piston pump |
US3857326A (en) * | 1971-08-17 | 1974-12-31 | Lucas Aerospace Ltd | Rotary hydraulic machines |
US4164169A (en) * | 1976-09-24 | 1979-08-14 | Linde Aktiengesellschaft | Axial-piston machine having a cylinder drum and a reversing device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2429011A (en) * | 1943-08-10 | 1947-10-14 | Aircraft Hydraulic Appliances | Pump |
US2518578A (en) * | 1946-08-15 | 1950-08-15 | Hydro Aire Inc | Hydraulic pump and motor transmission with motor displacement responsive to motor speed and fluid pressure |
US2716945A (en) * | 1952-10-17 | 1955-09-06 | Bendix Aviat Corp | Variable stroke rotary cylinder pump |
US2797643A (en) * | 1953-12-07 | 1957-07-02 | Motor Products Corp | Hydraulic pump structure |
US2871797A (en) * | 1957-03-19 | 1959-02-03 | Hugues A Bourassa | Pump |
US3064583A (en) * | 1957-03-29 | 1962-11-20 | Bendix Corp | Variable displacement pump |
US3096723A (en) * | 1958-12-29 | 1963-07-09 | Bendix Corp | Floating port plate construction |
-
1969
- 1969-03-24 US US810924A patent/US3518919A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2429011A (en) * | 1943-08-10 | 1947-10-14 | Aircraft Hydraulic Appliances | Pump |
US2518578A (en) * | 1946-08-15 | 1950-08-15 | Hydro Aire Inc | Hydraulic pump and motor transmission with motor displacement responsive to motor speed and fluid pressure |
US2716945A (en) * | 1952-10-17 | 1955-09-06 | Bendix Aviat Corp | Variable stroke rotary cylinder pump |
US2797643A (en) * | 1953-12-07 | 1957-07-02 | Motor Products Corp | Hydraulic pump structure |
US2871797A (en) * | 1957-03-19 | 1959-02-03 | Hugues A Bourassa | Pump |
US3064583A (en) * | 1957-03-29 | 1962-11-20 | Bendix Corp | Variable displacement pump |
US3096723A (en) * | 1958-12-29 | 1963-07-09 | Bendix Corp | Floating port plate construction |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3758899A (en) * | 1970-12-18 | 1973-09-18 | Lucas Industries Ltd | Rotary hydraulic machines |
US3788779A (en) * | 1971-05-27 | 1974-01-29 | F Carlson | Radial piston pump |
US3857326A (en) * | 1971-08-17 | 1974-12-31 | Lucas Aerospace Ltd | Rotary hydraulic machines |
US4164169A (en) * | 1976-09-24 | 1979-08-14 | Linde Aktiengesellschaft | Axial-piston machine having a cylinder drum and a reversing device |
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