GB1522027A - Control system for a variable displacement pump - Google Patents
Control system for a variable displacement pumpInfo
- Publication number
- GB1522027A GB1522027A GB39049/75A GB3904975A GB1522027A GB 1522027 A GB1522027 A GB 1522027A GB 39049/75 A GB39049/75 A GB 39049/75A GB 3904975 A GB3904975 A GB 3904975A GB 1522027 A GB1522027 A GB 1522027A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- pressure
- pump
- servomotor
- servo
- 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
-
- 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
- F04B49/002—Hydraulic systems to change the pump delivery
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F01B3/10—Control of working-fluid admission or discharge peculiar thereto
- F01B3/103—Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block
- F01B3/106—Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block by changing the inclination of the swash plate
-
- 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
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
-
- 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
- F04B49/08—Regulating by delivery pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Fluid Gearings (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
- Hydraulic Motors (AREA)
Abstract
1522027 Reciprocating pumps ABEX CORP 23 Sept 1975 [16 Oct 1974] 39049/75 Heading F1A [Also in Divisions F2 and G3] A variable displacement pump has its rocker cam 34 connected to a pivoted vane servomotor in which chambers 80, 81 communicate with ports 98, 97 having a moving-seat follow-up relationship with an input port 134 in a manually-operated valve 118, the pressure of the fluid supplied to and exhausted from the servomotor being automatically limited to values dependent on the pressure supplied by a servo pump 52 and the pressure of the fluid delivered by the variable displacement pump being limited by means which override the manual control of the servomotor. Check-valves 107, 108 and restrictors 109, 110 restrict exhaust flow from the servomotor while allowing a high flow into it. Flow through the pump is reversible so that either port P1 or P2 may be the output port. When P1 is the delivery port, and fluid pressure is excessive, output pressure acts through lines 249, 255 and 256 on a pilot valve 247 which lifts and allows a valve 203 to lift and establish communication from a line 248 through a line 269 to the chamber 80 to reduce the pump output. A further valve 207 loaded through a line 212 by pressure from the servo pump 52 lifts if the flow from the valve 203 is more than twice servo pressure and allows the excess flow to pass into a circuit 230 communicating with the pump inlet P2 through a check-valve 224. Excess pressure in the circuit 230 is relieved by a valve 201 delivering into the pump case 11 which is connected through a further relief valve 202 to tank. A valve 208, corresponding to the valve 207, but arranged to be loaded by half the pressure from the servo pump through two restrictors 285, 287 and a check-valve 289 limits the pressure in the exhaust chamber of the servomotor to servo pressure and spills any surplus into the circuit 230. Restrictors 205, 206 provide a pressure drop to operate the valve 203, or a valve 204 when P2 is the delivery port, to operate the servomotor in response to excess flow while a further valve 200 loaded through a plunger 218 by the output pressure from the variable displacement pump provides a relief valve for the servo pump 52, excess flow passing through the valve 201. Fluid spilled through the latter valve flows through passages 244 to cool the port plate of the pump before passing into the case 11. If the inlet port demands more fluid than the circuit 230 can supply, pressurized fluid from the pump case flows back through the passages 244 and the valve 201. The shaft 112 has a handle (111) Fig. 3 (not shown) at one end to operate the follow-up valve 118 and an indicator (140) at its other end.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US515270A US3908519A (en) | 1974-10-16 | 1974-10-16 | Control systems for a variable displacement pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1522027A true GB1522027A (en) | 1978-08-23 |
Family
ID=24050665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39049/75A Expired GB1522027A (en) | 1974-10-16 | 1975-09-23 | Control system for a variable displacement pump |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US3908519A (en) |
| JP (1) | JPS6127592B2 (en) |
| AU (1) | AU472949B2 (en) |
| BR (1) | BR7506777A (en) |
| CA (1) | CA1032441A (en) |
| CH (1) | CH617248A5 (en) |
| DE (1) | DE2545362C2 (en) |
| ES (1) | ES441550A1 (en) |
| FR (1) | FR2288236A1 (en) |
| GB (1) | GB1522027A (en) |
| IN (1) | IN142703B (en) |
| IT (1) | IT1047520B (en) |
| MX (1) | MX147117A (en) |
| NL (1) | NL178807C (en) |
| SE (1) | SE407101B (en) |
| SU (1) | SU736884A3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2550841A1 (en) * | 1983-07-26 | 1985-02-22 | Linde Ag | CONTROL DEVICE FOR A DRIVE COMPRISING A ROTARY DRAWER WITH TWO STRIPPING POINTS FOR ADJUSTING THE CONTROL PRESSURE |
| EP0359695A2 (en) * | 1988-09-14 | 1990-03-21 | Hagglunds Denison Corporation | Automatic control for variable displacement pump |
Families Citing this family (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2451380C2 (en) * | 1974-10-29 | 1985-08-14 | Linde Ag, 6200 Wiesbaden | Adjustable axial piston motor with a swivel vane actuator |
| US3982470A (en) * | 1975-08-04 | 1976-09-28 | Abex Corporation | Control system for axial piston fluid energy translating device |
| US4008004A (en) * | 1975-12-22 | 1977-02-15 | Abex Corporation | Control system for variable displacement pumps |
| US4029439A (en) * | 1975-12-22 | 1977-06-14 | Abex Corporation | Control system for variable displacement pumps |
| US4076459A (en) * | 1976-09-14 | 1978-02-28 | Abex Corporation | Horsepower limiter control for a variable displacement pump |
| US4142841A (en) * | 1977-08-31 | 1979-03-06 | Parker-Hannifin Corporation | Variable displacement pump control |
| US4476680A (en) * | 1979-08-14 | 1984-10-16 | Sundstrand Corporation | Pressure override control |
| US4336003A (en) * | 1980-08-11 | 1982-06-22 | Abex Corporation | Crane swing control |
| DE3238362A1 (en) * | 1982-10-15 | 1984-04-19 | Linde Ag, 6200 Wiesbaden | Axial piston machine |
| US4455124A (en) * | 1982-12-20 | 1984-06-19 | Abex Corporation | Automatic pressure setting adjustment for a pressure compensated pump |
| US4617797A (en) * | 1984-05-09 | 1986-10-21 | Sundstrand Corporation | Multi-function valve |
| US4722186A (en) * | 1986-01-24 | 1988-02-02 | Sundstrand Corporation | Dual pressure displacement control system |
| US4768340A (en) * | 1987-04-24 | 1988-09-06 | Allied-Signal Inc. | Automatic displacement control for variable displacement motor |
| US5076145A (en) * | 1990-06-04 | 1991-12-31 | Hagglunds Denison Corporation | Axial piston pump having a blocking valve in a manually controlled valve plate |
| US5590579A (en) * | 1995-10-31 | 1997-01-07 | Eaton Corporation | Hydrostatic pump and bearing-clocking mechanism therefor |
| US6694729B1 (en) | 1999-07-16 | 2004-02-24 | Hydro-Gear Limited Partnership | Pump |
| US7178336B1 (en) | 1999-07-16 | 2007-02-20 | Hydro-Gear Limited Partnership | Pump |
| US6332393B1 (en) * | 1999-07-16 | 2001-12-25 | Hydro-Gear Limited Partnership | Pump |
| US7082762B1 (en) | 1999-07-16 | 2006-08-01 | Hydro-Gear Limited Partnership | Pump |
| US6889595B1 (en) | 1999-07-16 | 2005-05-10 | Hydro-Gear Limited Partnership | Pump |
| US6672843B1 (en) | 2002-04-08 | 2004-01-06 | Hydro-Gear Limited Partnership | Dual pump apparatus comprising dual drive shafts and auxiliary pump |
| US6893228B2 (en) * | 2002-11-22 | 2005-05-17 | Caterpillar Inc | Axial piston pump with fluid bearing arrangement |
| WO2004058550A2 (en) * | 2002-12-16 | 2004-07-15 | Walker Frank H | Hydraulic regenerative braking system for a vehicle |
| US6953327B1 (en) | 2003-03-11 | 2005-10-11 | Hydro-Gear Limited Partnership | Dual pump |
| US7107892B2 (en) * | 2003-03-26 | 2006-09-19 | Parker-Hannifin | Housing with multiple case drain ports for hydrostatic transmission pumps |
| WO2006066156A2 (en) * | 2004-12-17 | 2006-06-22 | Walker Frank H | Hydraulic regenerative braking system and method for a vehicle |
| US7789846B2 (en) * | 2005-01-25 | 2010-09-07 | Thermopeutix, Inc. | System and methods for selective thermal treatment |
| US20080210500A1 (en) * | 2005-05-11 | 2008-09-04 | Walker Frank H | Hydraulic Regenerative Braking System For a Vehicle |
| US8162621B2 (en) * | 2007-02-12 | 2012-04-24 | Walker Frank H | Hydraulic machine arrangement |
| WO2008100953A1 (en) * | 2007-02-12 | 2008-08-21 | Walker Frank H | Hydraulic machine arrangement |
| US8974203B2 (en) * | 2007-04-03 | 2015-03-10 | Parker-Hannifin Corporation | Hydraulic pump end cover |
| US11306713B2 (en) * | 2017-11-14 | 2022-04-19 | Eaton Intelligent Power Limited | Hydraulic pump with speed and pressure compensation |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1453656A1 (en) * | 1951-01-28 | 1969-04-30 | Fritz Stumpmeier | Universal control and regulating element for pumps that change delivery flow |
| DE1154689B (en) * | 1960-07-09 | 1963-09-19 | Linde Eismasch Ag | Device for controlling a continuously variable hydrostatic unit |
| US3257959A (en) * | 1964-05-21 | 1966-06-28 | Budzich Tadeusz | Controls for reversible variable flow pumps |
| US3187509A (en) * | 1964-09-16 | 1965-06-08 | Sundstrand Corp | Hydrostatic transmission |
| US3383857A (en) * | 1966-05-24 | 1968-05-21 | Borg Warner | Hydrostatic transmission mechanism |
| US3396536A (en) * | 1966-08-08 | 1968-08-13 | Cessna Aircraft Co | Hydraulic transmission |
| DE1917488B2 (en) * | 1969-04-05 | 1977-06-23 | Robert Bosch Gmbh, 7000 Stuttgart | CONTROL DEVICE FOR A HYDRO MACHINE |
| DE1922145A1 (en) * | 1969-04-25 | 1970-10-29 | Bellows Valvair Kaemper Gmbh | Combination controller |
| BE757640A (en) * | 1969-10-16 | 1971-04-16 | Borg Warner | HYDRAULIC SYSTEMS, ESPECIALLY FOR THE REGULATION OF A VARIABLE FLOW PUMP |
| US3739974A (en) * | 1970-04-13 | 1973-06-19 | Production Technology Inc | Conversion of variable delivery pump to fixed delivery pump for a friction welder |
| DE2141724A1 (en) * | 1971-08-20 | 1973-03-01 | Bosch Gmbh Robert | CONTROL AND REGULATING DEVICE FOR A HYDROPUMP |
-
1974
- 1974-10-16 US US515270A patent/US3908519A/en not_active Expired - Lifetime
-
1975
- 1975-09-01 IN IN1683/CAL/75A patent/IN142703B/en unknown
- 1975-09-03 CA CA234,667A patent/CA1032441A/en not_active Expired
- 1975-09-10 NL NLAANVRAGE7510658,A patent/NL178807C/en not_active IP Right Cessation
- 1975-09-12 AU AU84786/75A patent/AU472949B2/en not_active Expired
- 1975-09-19 IT IT51415/75A patent/IT1047520B/en active
- 1975-09-19 JP JP50113584A patent/JPS6127592B2/ja not_active Expired
- 1975-09-23 GB GB39049/75A patent/GB1522027A/en not_active Expired
- 1975-10-07 ES ES441550A patent/ES441550A1/en not_active Expired
- 1975-10-09 DE DE2545362A patent/DE2545362C2/en not_active Expired
- 1975-10-10 SU SU752178649A patent/SU736884A3/en active
- 1975-10-10 CH CH1315175A patent/CH617248A5/de not_active IP Right Cessation
- 1975-10-15 MX MX161327A patent/MX147117A/en unknown
- 1975-10-15 SE SE7511568A patent/SE407101B/en not_active IP Right Cessation
- 1975-10-16 BR BR7506777*A patent/BR7506777A/en unknown
- 1975-10-16 FR FR7531742A patent/FR2288236A1/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2550841A1 (en) * | 1983-07-26 | 1985-02-22 | Linde Ag | CONTROL DEVICE FOR A DRIVE COMPRISING A ROTARY DRAWER WITH TWO STRIPPING POINTS FOR ADJUSTING THE CONTROL PRESSURE |
| GB2144242A (en) * | 1983-07-26 | 1985-02-27 | Linde Ag | A machine control arrangement |
| EP0359695A2 (en) * | 1988-09-14 | 1990-03-21 | Hagglunds Denison Corporation | Automatic control for variable displacement pump |
| EP0359695A3 (en) * | 1988-09-14 | 1990-09-05 | Hagglunds Denison Corporation | Automatic control for variable displacement pump |
Also Published As
| Publication number | Publication date |
|---|---|
| SE7511568L (en) | 1976-04-17 |
| CA1032441A (en) | 1978-06-06 |
| SE407101B (en) | 1979-03-12 |
| DE2545362A1 (en) | 1976-04-22 |
| FR2288236A1 (en) | 1976-05-14 |
| CH617248A5 (en) | 1980-05-14 |
| SU736884A3 (en) | 1980-05-25 |
| NL7510658A (en) | 1976-04-21 |
| IT1047520B (en) | 1980-10-20 |
| NL178807C (en) | 1986-05-16 |
| ES441550A1 (en) | 1977-04-01 |
| MX147117A (en) | 1982-10-11 |
| BR7506777A (en) | 1976-08-17 |
| IN142703B (en) | 1977-08-20 |
| US3908519A (en) | 1975-09-30 |
| JPS5157001A (en) | 1976-05-19 |
| FR2288236B1 (en) | 1979-02-16 |
| DE2545362C2 (en) | 1984-05-24 |
| JPS6127592B2 (en) | 1986-06-26 |
| AU8478675A (en) | 1976-06-10 |
| AU472949B2 (en) | 1976-06-10 |
| NL178807B (en) | 1985-12-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940923 |