GB1487542A - Axial-piston variable-delivery pump and hydraulic drive - Google Patents
Axial-piston variable-delivery pump and hydraulic driveInfo
- Publication number
- GB1487542A GB1487542A GB1280476A GB1280476A GB1487542A GB 1487542 A GB1487542 A GB 1487542A GB 1280476 A GB1280476 A GB 1280476A GB 1280476 A GB1280476 A GB 1280476A GB 1487542 A GB1487542 A GB 1487542A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- delivery
- valve
- valves
- crown
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
-
- 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
- F04B1/16—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 having two or more sets of cylinders or pistons
-
- 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
- F04B49/243—Bypassing by keeping open the inlet valve
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
1487542 Reciprocating pumps; hydraulic control circuits VSES NI I PROEKTNO - KONSTRUKT INST PROMYSHLEN GIDROPRIVODOV I GIDROAVTOMATIKI 30 March 1976 12804/76 Headings F1A and F1P A variable-delivery swash-plate pump, e.g. for supplying actuating liquid to the hydraulic actuators of a sheet-bending press Fig. 8, comprises a plurality of pumping chambers 8 with pairs of opposed pistons 6 reciprocated by swashplates 9 on a shaft 7, each chamber 8 communicating with inlet and outlet manifolds 2, 3 via spring-loaded inlet and outlet valves 18, 19, a plunger assembly 22, 25 acting on the inlet valve stem 24 being hydraulically controlled by a sleeve valve 28 rotating with shaft 7 and axially movable by a control rod 31 to effect opening of the inlet valve for the intake stroke, and also during the delivery stroke to vary the pump delivery. Axial movement of valve 28 varies the opening time of the inlet valve during delivery due to a tapered land arrangement on valve 28, Figs. 2 and 3 (not shown). Control pressure is supplied to valve 28 via passage 4. The effect of valve 28 may be over-ridden by supplying control pressure between plungers 22, 25 via passages 27, 26 to hold the inlet valve open. In Fig. 4 (not shown), plungers 22, 25 are replaced by a plunger (56) having a stem (57) on which an annular plunger (58) is slidable. In Fig. 5 (not shown), plungers 22, 25 are replaced by a plunger (59) having an annular groove (60) engageable by a stem (62) of a hydraulically-actuated piston (61) which acts to lock the inlet valve in its open position. Half of the pumping chambers may be arranged to supply a different outlet conduit from the other half, the two sets of inlet valves also being independently controlled to independently vary the two deliveries, Figs. 6 and 7 (not shown). The press actuating system, Fig. 8, comprises double-acting, piston-cylinder units 68, 69 connected to the press crown 72 and supplied with actuating liquid by the twin delivery pump 1, the two deliveries 66, 67 being connected to the respective units 68, 69 and independently controlled through connections 27, 65. A solenoid-actuated valve 80 determines the direction of movement of the crown 72 by controlling reversing valves 84, 91 in the respective delivery circuits, check valves 88, 95 acting to hold crown 72 in position if the pump 1 stops. Pump 77 supplies control liquid pressure for adjusting the pump deliveries. Valves 130, 133 are actuated towards the end of the downward stroke of crown 72 to connect control pressure to set pump 1 to zero delivery. Lack of synchronism between units 68, 69 is detected by valve 74 actuated by a roller 106 on crown 72 moving a lever pivoted on a stationary housing, valve 74 acting to reduce the pump delivery to the advanced cylinder. Valves 76 respond to excessive pump delivery pressures to reduce the delivery on the affected delivery side of the pump. Pump 77 has a pressure relief valve 81. In an alternative system, Fig. 9 (not shown), control liquid supply pump 77 communicates with the main pump control connections 27, 65 via throttles (140, 142), and the valves responsive to excess delivery pressure, lack of synchronism and end of stroke of crown 72 are normally open to vent connections 27, 65, and when operated are closed so that control pressure is applied to connections 27, 65.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1280476A GB1487542A (en) | 1976-03-30 | 1976-03-30 | Axial-piston variable-delivery pump and hydraulic drive |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1280476A GB1487542A (en) | 1976-03-30 | 1976-03-30 | Axial-piston variable-delivery pump and hydraulic drive |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1487542A true GB1487542A (en) | 1977-10-05 |
Family
ID=10011460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1280476A Expired GB1487542A (en) | 1976-03-30 | 1976-03-30 | Axial-piston variable-delivery pump and hydraulic drive |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1487542A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10021485A1 (en) * | 2000-05-03 | 2001-11-15 | Brueninghaus Hydromatik Gmbh | Hydrostatic machine |
CN102937087A (en) * | 2012-10-30 | 2013-02-20 | 王玉喜 | Plunger pump in double swash plate structure |
-
1976
- 1976-03-30 GB GB1280476A patent/GB1487542A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10021485A1 (en) * | 2000-05-03 | 2001-11-15 | Brueninghaus Hydromatik Gmbh | Hydrostatic machine |
US6846165B2 (en) | 2000-05-03 | 2005-01-25 | Brueninghaus Hydromatik Gmbh | Hydrostatic machine |
DE10021485B4 (en) * | 2000-05-03 | 2006-03-23 | Brueninghaus Hydromatik Gmbh | Hydrostatic machine |
CN102937087A (en) * | 2012-10-30 | 2013-02-20 | 王玉喜 | Plunger pump in double swash plate structure |
CN102937087B (en) * | 2012-10-30 | 2014-12-10 | 王玉喜 | Plunger pump in double swash plate structure |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |