EP0045928B1 - Transmission de puissance - Google Patents

Transmission de puissance Download PDF

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Publication number
EP0045928B1
EP0045928B1 EP19810106075 EP81106075A EP0045928B1 EP 0045928 B1 EP0045928 B1 EP 0045928B1 EP 19810106075 EP19810106075 EP 19810106075 EP 81106075 A EP81106075 A EP 81106075A EP 0045928 B1 EP0045928 B1 EP 0045928B1
Authority
EP
European Patent Office
Prior art keywords
passage
inlet
pump
tank
return
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
Application number
EP19810106075
Other languages
German (de)
English (en)
Other versions
EP0045928A1 (fr
Inventor
Albin Joseph Niemiec
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vickers Inc
Original Assignee
Vickers Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vickers Inc filed Critical Vickers Inc
Publication of EP0045928A1 publication Critical patent/EP0045928A1/fr
Application granted granted Critical
Publication of EP0045928B1 publication Critical patent/EP0045928B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels

Definitions

  • the invention relates to a power transmission as set forth in the preamble of claim 1.
  • Hydraulic pumps for assisted steering are of the fixed displacement type and are driven at variable speeds by the engines of the automotive vehicles.
  • a flow control valve is provided for bypassing or returning that portion of the pump fluid surpassing the predetermined constant volume of flow.
  • a restricted size of the first passage is a precondition.
  • the flow through the inlet of restricted size is such that excessive inlet vacuum and therefore cavitational damage can occur, especially when the fluid is very viscous, and this danger is also present at larger control flows.
  • a power transmission is known (GB-A-2,019,940) wherein a tank passage is brought into communication with a passage that communicates with a venturi throat.
  • the creation of a strong jet to aspirate fluid is not described and, due to the inlet configuration shown, probably not possible.
  • the single drawing is a partly schematic view of a hydraulic system embodying the invention.
  • the hydraulic system comprises a fixed displacement pump 10 driven by a prime mover such as the engine of an automotive vehicle to supply fluid through an orifice 11 to a steering booster 12 such as a linear or rotary hydraulic motor.
  • a steering booster 12 such as a linear or rotary hydraulic motor.
  • the return of fluid through a line 13 is to a reservoir 14. Fluid from the reservoir flows through a first tank line 15 and a passage 16 to the inlet 17 of the pump.
  • a flow control valve 18 comprising a spool 19 having spaced lands 20, 21 is provided in a bore 22 and is operable in accordance with well known practice to bypass the fluid when the volume exceeds a predetermined rate.
  • a line 23 extends from the outlet of the pump and has an orifice 24 therein to the spring end of the spool.
  • an auxiliary passage 26 is provided and communicates as shown diagrammatically by a line 27 with the reservoir 14. Passage 26 functions to provide supplemental flow of hydraulic fluid to the inlet 17 at the lower speeds. It is noted that the passage 26 is located upstream from the passage 16 and is hydraulically isolated from the fluid applied to the flow control valve when the flow control valve is in closed position.
  • a hydraulic system embodying the invention provides improved filling at the inlet at the lower speeds before the flow control valve begins to bypass the discharge volume, lowers the sound level, reduces the wear and maintenance that might be caused by vacuum and cavitational damage.
  • the additional passage also functions to increase the pressure at the inlet supplementing the supercharging normally provided by the flow control valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Power Steering Mechanism (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (3)

1. Transmission de puissance comportant une pompe à déplacement fixe (10) entraînée par un moteur pouvant fonctionner à des vitesses variables dans un système hydraulique, dans lequel on souhaite avoir un débit volumétrique prédéterminé vers une charge (12), ladite pompe (10) comportant au moins une zone de pompage ayant une entrée (17) et une sortie, une première conduite de réservoir (15) comportant au moins un premier passage (16) vers l'entrée (17) de la zone de pompage, et une soupape de contrôle de débit (18) comportant un alésage de soupape (22), un corps en forme de bobine (19) ayant des première (20) et deuxième (21) cloisons, ladite deuxième cloison (21) pouvant fonctionner pour ramener une partie du fluide hydraulique depuis la sortie de la pompe (10), par une conduite de retour (25) vers l'entrée (17) de ladite zone de pompage, ladite deuxième cloison (21) se déplaçant sur une position dans laquelle le débit de retour dans la conduite de retour (25) se précipite entre la deuxième cloison (21) et l'alésage de soupape (22), dans l'entrée (17), et aspire le fluide hydraulique depuis le premier passage de réservoir (16) lorsque la pompe (10) est commandée aux vitesses plus élevées, caractérisée en ce que: en amont du premier passage de réservoir (16), une deuxième conduite de réservoir (27) est prévue ayant un deuxième passage auxiliaire (26) qui se situe dans la soupape de contrôle de débit (18) entre les deux cloisons (20, 21), et, par là, est à tout moment en communication avec l'entrée (17).
2. Transmission de puissance selon la revendication 1, caractérisée en ce que la soupape de contrôle de débit (18), la conduite de retour (25), le premier passage (16) et le deuxième passage (26) sont dans le même logement que la pompe (10).
3. Transmission de puissance selon la revendication 1 ou 2, caractérisée en ce que seuls la conduite de retour (25) et le passage auxiliaire (26) intersectent l'alésage de soupape (22) dans des sens de circulation analogues et en amont de la première conduite de réservoir (15) de manière à communiquer avec le premier passage (16) dans l'entrée (17) lorsque la deuxième cloison (21) est dans sa position permettant une circulation de retour.
EP19810106075 1980-08-11 1981-08-04 Transmission de puissance Expired EP0045928B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17736980A 1980-08-11 1980-08-11
US177369 1980-08-11

Publications (2)

Publication Number Publication Date
EP0045928A1 EP0045928A1 (fr) 1982-02-17
EP0045928B1 true EP0045928B1 (fr) 1985-11-21

Family

ID=22648334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810106075 Expired EP0045928B1 (fr) 1980-08-11 1981-08-04 Transmission de puissance

Country Status (6)

Country Link
EP (1) EP0045928B1 (fr)
JP (1) JPS5752686A (fr)
AU (1) AU545989B2 (fr)
CA (1) CA1160538A (fr)
DE (1) DE3172983D1 (fr)
IN (1) IN153744B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006177230A (ja) * 2004-12-22 2006-07-06 Kayaba Ind Co Ltd ポンプ装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253607A (en) * 1964-06-10 1966-05-31 Trw Inc Combination pump and flow regulator
US3644065A (en) * 1970-03-18 1972-02-22 Bosch Gmbh Robert Apparatus for filling the suction chamber of a pump at high-pump speeds
JPS5629510Y2 (fr) * 1977-02-18 1981-07-14
US4207038A (en) * 1978-05-01 1980-06-10 Ford Motor Company Power steering pump

Also Published As

Publication number Publication date
CA1160538A (fr) 1984-01-17
JPH0138708B2 (fr) 1989-08-16
IN153744B (fr) 1984-08-18
JPS5752686A (en) 1982-03-29
DE3172983D1 (en) 1986-01-02
AU545989B2 (en) 1985-08-08
EP0045928A1 (fr) 1982-02-17
AU7185081A (en) 1982-02-18

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