US3791766A - Hydraulic pressure generating device - Google Patents

Hydraulic pressure generating device Download PDF

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Publication number
US3791766A
US3791766A US00222848A US3791766DA US3791766A US 3791766 A US3791766 A US 3791766A US 00222848 A US00222848 A US 00222848A US 3791766D A US3791766D A US 3791766DA US 3791766 A US3791766 A US 3791766A
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US
United States
Prior art keywords
housing
pump
air holes
room
generating device
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
Application number
US00222848A
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English (en)
Inventor
A Kikutsugi
Y Shimoyama
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.)
Tokyo Keiki Inc
Original Assignee
Tokyo Keiki Co Ltd
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 Tokyo Keiki Co Ltd filed Critical Tokyo Keiki Co Ltd
Application granted granted Critical
Publication of US3791766A publication Critical patent/US3791766A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • 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
    • F04B23/00—Pumping installations or systems
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/042—Controlling the temperature of the fluid
    • F15B21/0423—Cooling

Definitions

  • ABSTRACT A hydraulic pressure generating device having a housing with air holes formed at least in its upper and lower walls, a partition wall with air holes to divide the housing into upper and lower rooms, a fan located in the upper room of the housing, a pressure compensation variable discharge type pump, a motor mounted in the lower room for driving the pump, and an oil [56] References Cited tank disposed in the lower room and having soaked UNnED STATES PATENTS therein the pump.
  • an oil actuating oil 4
  • the motor 2 rotates, the oil 4 is introduced through a filter 5 and a hose 6 into the pump 1, from which a constant amount of oil per unit time is continuously discharged.
  • One part of the discharged oil is returned to the oil tank 3 through a line filter 7, a load 8 and a cooler 9.
  • the present invention is to provide a hydraulic pressure generating device which is free from the aforementioned defects experienced in the prior art, and hence is highly efficient, capable of suppressing heat generation of the oil used, extending the lifetime of the instruments and oil and preventing deterioration of the oil and is inexpensive and good in appearance.
  • FIG. 1 is a schematic diagram showing a conventional type of hydraulic pressure generating device
  • FIG. 2 is a schamatic diagram illustrating a hydraulic pressure generating device of the present invention
  • FIG. 3 is a perspective view of the device of this invention.
  • FIG. 4 is a fragmentary cross-sectional view of the device of FIG. 3;
  • FIG. 5 is a cross-sectional view showing one example of a pump for use in this invention.
  • reference numeral 21 designates a pressure compensating variable discharge type pump, which is driven a motor 22.
  • Reference numeral 23 indicates an oil tank and 24 an oil contained therein.
  • Reference numeral 18 identifies a load driven by the pump 21.
  • a housing 25 as of iron or like material is provided, which is divided by a partition wall 26 into upper and lower rooms 27 and 28 and a plurality of air holes 29 are formed in the partition wall 26.
  • an exhaust fan 30 is disposed, which is driven by a motor, though not shown.
  • the pump 21 is disposed below the oil level 24a in the oil tank 23.
  • the motor 22 is attached to an upper wall 23a of the oil tank 23 with its rotary shaft 22a being held vertically and the pump 21 is disposed in the oil 24 and a rotary shaft 21a of the pump 21 is coupled by a coupling 31 with that 22a of the motor 22.
  • Reference numeral 32 designates a fixture of the motor 22, 33 a fixture of the pump 21, 34 an air escape bored in a case 21b of the pump 21 near the end of the shaft 210 at such a position as not to affect the bearing support, 340 an ordinary drain port and 35 a hose for supplying the oil discharged from the pump 21 to the outside, which hose is preferred to be formed of rubber or like elastic material.
  • the horizontal area of the oil tank 23 is selected to be relatively smaller than that of the lower room 28 of the housing 25, many radiation fins 36 are mounted on the outside of the oil tank 23 and slit-like air holes 37a and 37b are formed in the upper and lower walls 25a and 25b of the housing 25.
  • Reference numeral 38 indicates support legs for supporting the oil tank 23. Between the legs 38 and the oil tank 23 the legs legs 38 and the lower wall 25b of the housing 25 are interposed vibration-proof members 39 as of rubber to prevent transmission of the vibration of the motor 22 and the pump 21 to the housing 25 and, further, vibrationproof rubber members 41 may be interposed between the housing 25 and its legs 40.
  • vibration-proof members 39 as of rubber to prevent transmission of the vibration of the motor 22 and the pump 21 to the housing 25 and, further, vibrationproof rubber members 41 may be interposed between the housing 25 and its legs 40.
  • reference numerals 42 and 43 designate adjusting levers respectively one ends of which project from the upper wall 23a of the oil tank 23,the former being used for adjustment of a pressure compensator and the latter for adjustment of the amount of the oil discharged by adjusting the inclination of an inclined plate of the pump 21.
  • FIG. 5 illustrates one example of the discharge type pump 21, in which reference numeral 44 indicates its drive shaft, 45 a swash-plate (inclined plate), 46 a piston, 47 a cylinder block, 48 a valve plate and 49 a pressure compensator. If necessary, filters may be provided before and after the pump 21.
  • the hydraulic pressure of the oil discharged from the pump 21 and the amount of the oil discharged therefrom per unit time can be independently adjusted by manual operation of the adjusting levers 42 and 43 and even when the pump 21 is soaked in the oil and, further, these values can be set at minimum values corresponding to the load, so that ineffective power can be theoretically minimized and the required capacity of the motor 22 can be decreased.
  • this device is applied to many kinds of apparatus, the number of the kinds thereof in view of the capacity of the pump 21 can be decreased and the hydraulic pressure generating device can be standardized and mass produced.
  • the pump 21, the motor 22, the oil tank 23 and so on are covered with the housing 25, so that the fins 36 on the oil tank 23 cannot be seen from the outside and do not defile the appearance of the device.
  • the shapes of the air holes 29 and slits 37b are selected and a pressure-reduced air layer is produced by the operation of the exhaust fan 30 in the housing 25.
  • the air layer and the housing 25 effectively suppress propagation of mechanical vibration.
  • the fins 36 serve to reinforce the oil tank 23.
  • the suction resistance of the pump 21 is decreased to improve conditions for the generation of cavitation, which results in an increase in the efficiency of the pump 21 to alleviate the generation of vibration.
  • the drain pipe 12 depicted in FIG. 1 is unnecessary and accordingly the manufacturing cost can be curtailed and, at the same time, vibration of the pump 21 and propagation of its echo can be suppressed because the pump 21 is entirely enveloped in the oil.
  • the air escape 34 formed in the pump 21 facilitates deflation of the pump 21, which enables a supply of oil to internal lubricating units such as bearings of the pump 21 and so on to provide for prolonged lifetime thereof.
  • the hose 35 directly connected to the discharge port of the pump 21 is formed of an elastic or flexible material such as rubber and disconnected from the hose used on the side of the load. This allows ease in the fabrication of this device, enables prevention of mixing of a foreign substance into the oil and effectively absorbs pulsation of the discharged oil.
  • this invention is capable of controlling the temperature and viscosity of the oil and maintenance of its quality which are important for lubrication of this kind of apparatus. Further, when employed in the hydraulic pressure system, wear of the pump shown in FIG. 5 is further reduced. The present invention dispenses with the line filter disposed understream of the pump which causes wear of the pump, permitting simplification of the construction of the device, coupled with the nonuse of the relief valve.
  • a hydraulic pressure generating device including a housing having air holes formed at least in upper and lower walls thereof, a partition wall dividing the housing into upper and lower rooms and having air holes, a fan disposed in the upper room of the housing, a pressure compensation variable discharge type pump, a motor disposed in the lower room of the housing for driving the pump, and an oil tank disposed in the lower room of the housing and having the pump immersed therein, the improvement therein, wherein the shapes of the air holes formed in the partition wall and in the lower wall of the housing are selected to provide a pressure-reduced room in the housing, so that when the fan is operated, air is sucked into the housing from the air holes formed in its lower wall and is discharged out of the housing from the air holes formed in its upper wall, so as to cool the pump and the motor.
  • a hydraulic pressure generating device comprismg:
  • a first motor disposed in the upper room for driving the fan
  • an oil tank disposed in the housing and having the pump immersed therein, whereby when the fan is operated, air is sucked into the housing from the air holes formed in the lower wall and then is exhausted out of the housing from the air holes formed in the upper wall.
  • a hydraulic pressure generating device comprising:
  • an oil tank disposed in the housing and having the pump immersed therein, wherein the shapes of the air holes formed in the partition wall and in the lower wall of the housing are so selected as to provide a pressure-reduced room in the housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
US00222848A 1971-02-27 1972-02-02 Hydraulic pressure generating device Expired - Lifetime US3791766A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971012444U JPS4710902U (it) 1971-02-27 1971-02-27

Publications (1)

Publication Number Publication Date
US3791766A true US3791766A (en) 1974-02-12

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ID=11805470

Family Applications (1)

Application Number Title Priority Date Filing Date
US00222848A Expired - Lifetime US3791766A (en) 1971-02-27 1972-02-02 Hydraulic pressure generating device

Country Status (5)

Country Link
US (1) US3791766A (it)
JP (1) JPS4710902U (it)
DE (1) DE2207678A1 (it)
GB (1) GB1329395A (it)
SE (1) SE372599B (it)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585398A (en) * 1984-08-08 1986-04-29 Drake Maurice D Combination fluid tank, air/fluid cooler and prime mover/pump mounting system for a hydraulic power unit
US5613843A (en) * 1992-09-11 1997-03-25 Hitachi, Ltd. Package-type screw compressor
US5708311A (en) * 1996-07-17 1998-01-13 Vickers, Inc. Integrated electric motor driven in line hydraulic pump
US6290473B1 (en) * 1997-03-20 2001-09-18 Flutec Fluidtechnische Gerate Gmbh Fluid cooling device
EP1520995A2 (en) * 2003-09-29 2005-04-06 Fluid House Oy Hydraulic apparatus and method for manufacturing and using thereof
US20050135953A1 (en) * 2003-12-19 2005-06-23 Annovi Reverberi S.P.A. Hydraulic pump
WO2005061904A1 (en) * 2003-09-22 2005-07-07 Dana Corporation Pressure vessel assembly for integrated pressurized fluid system
US20060024173A1 (en) * 2004-08-02 2006-02-02 Annovi Reverberi S.P.A. Pump body with plunger pistons
CN101885075A (zh) * 2010-07-01 2010-11-17 东南大学 一种用于控制立式机床主轴箱热变形的空冷装置
WO2015026558A1 (en) * 2013-08-22 2015-02-26 Stanley Black & Decker, Inc. Hydraulic power unit
US20150375966A1 (en) * 2014-06-30 2015-12-31 Thyssenkrupp Elevator Corporation Noise Abatement for Elevator Submersible Power Units
CN114278629A (zh) * 2021-11-24 2022-04-05 中联重科土方机械有限公司 液压油箱、液压系统和液压油箱的气压平衡方法
US11958177B2 (en) 2018-09-07 2024-04-16 Milwaukee Electric Tool Corporation Hydraulic piston pump for a hydraulic tool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5044454Y2 (it) * 1972-12-15 1975-12-18
DE2948105C2 (de) * 1979-11-29 1983-06-23 Daimler-Benz Ag, 7000 Stuttgart Druckversorgungsaggregat für hydraulische Verbraucher, insbesondere für eine Hilfskraftlenkung eines Kraftfahrzeuges
JPS56145039A (en) * 1980-04-12 1981-11-11 Satake Eng Co Ltd Feeder to corn dryer
DE102017127675B4 (de) 2017-11-23 2023-03-23 HAWE Altenstadt Holding GmbH Hydraulische Druckversorgungseinheit

Citations (15)

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US1953473A (en) * 1933-07-17 1934-04-03 Fedders Mfg Co Inc Refrigeration device
US2136098A (en) * 1937-07-28 1938-11-08 Kellogg Compressor And Mfg Cor Air compressing apparatus
US2297220A (en) * 1938-03-23 1942-09-29 Hintze Rudolf Motor-compressor unit for refrigerators
US2299233A (en) * 1937-05-03 1942-10-20 Ex Cell O Corp Pump
US2510632A (en) * 1945-11-27 1950-06-06 Gen Electric Machine cooling system
US2550754A (en) * 1946-05-14 1951-05-01 Augustus L Baker Heating apparatus
US2847942A (en) * 1953-04-21 1958-08-19 American Brake Shoe Co Means of providing air purging in piston pump
US3080495A (en) * 1958-05-13 1963-03-05 Gustav H Sudmeier Compressor apparatus
US3156409A (en) * 1962-08-07 1964-11-10 Jaeger Machine Co Enclosed rotary industrial air compressor
US3348609A (en) * 1966-04-29 1967-10-24 Lambda Electronics Corp Multi-positional power supply module and heat exchange techniques
US3369736A (en) * 1966-04-26 1968-02-20 Worthington Corp Forced ventilation for motor cooling on enclosed motor driven compressor unit
US3372863A (en) * 1966-04-26 1968-03-12 Worthington Corp Enclosed motor driven compressor unit
US3478958A (en) * 1968-01-11 1969-11-18 Ingersoll Rand Co Housing for portable machines
US3487431A (en) * 1968-06-24 1969-12-30 Whittaker Corp Hydraulic power system
US3694108A (en) * 1969-04-23 1972-09-26 Carlo Pensa Hydraulic apparatus for regulating the flow of one or more pumps

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1953473A (en) * 1933-07-17 1934-04-03 Fedders Mfg Co Inc Refrigeration device
US2299233A (en) * 1937-05-03 1942-10-20 Ex Cell O Corp Pump
US2136098A (en) * 1937-07-28 1938-11-08 Kellogg Compressor And Mfg Cor Air compressing apparatus
US2297220A (en) * 1938-03-23 1942-09-29 Hintze Rudolf Motor-compressor unit for refrigerators
US2510632A (en) * 1945-11-27 1950-06-06 Gen Electric Machine cooling system
US2550754A (en) * 1946-05-14 1951-05-01 Augustus L Baker Heating apparatus
US2847942A (en) * 1953-04-21 1958-08-19 American Brake Shoe Co Means of providing air purging in piston pump
US3080495A (en) * 1958-05-13 1963-03-05 Gustav H Sudmeier Compressor apparatus
US3156409A (en) * 1962-08-07 1964-11-10 Jaeger Machine Co Enclosed rotary industrial air compressor
US3369736A (en) * 1966-04-26 1968-02-20 Worthington Corp Forced ventilation for motor cooling on enclosed motor driven compressor unit
US3372863A (en) * 1966-04-26 1968-03-12 Worthington Corp Enclosed motor driven compressor unit
US3348609A (en) * 1966-04-29 1967-10-24 Lambda Electronics Corp Multi-positional power supply module and heat exchange techniques
US3478958A (en) * 1968-01-11 1969-11-18 Ingersoll Rand Co Housing for portable machines
US3487431A (en) * 1968-06-24 1969-12-30 Whittaker Corp Hydraulic power system
US3694108A (en) * 1969-04-23 1972-09-26 Carlo Pensa Hydraulic apparatus for regulating the flow of one or more pumps

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585398A (en) * 1984-08-08 1986-04-29 Drake Maurice D Combination fluid tank, air/fluid cooler and prime mover/pump mounting system for a hydraulic power unit
US5613843A (en) * 1992-09-11 1997-03-25 Hitachi, Ltd. Package-type screw compressor
US5708311A (en) * 1996-07-17 1998-01-13 Vickers, Inc. Integrated electric motor driven in line hydraulic pump
US6290473B1 (en) * 1997-03-20 2001-09-18 Flutec Fluidtechnische Gerate Gmbh Fluid cooling device
US8726977B2 (en) 2003-09-22 2014-05-20 Bosch Rexroth Corporation Pressure vessel assembly for integrated pressurized fluid system
CN1871439B (zh) * 2003-09-22 2011-02-02 博施瑞克罗斯公司 用于一体化的加压流体系统的压力容器组件
WO2005061904A1 (en) * 2003-09-22 2005-07-07 Dana Corporation Pressure vessel assembly for integrated pressurized fluid system
GB2420594A (en) * 2003-09-22 2006-05-31 Dana Corp Pressure vessel assembly for integrated pressurized fluid system
US20070084516A1 (en) * 2003-09-22 2007-04-19 Rose Kenric B Pressure vessel assembly for integrated pressurized fluid system
GB2420594B (en) * 2003-09-22 2008-01-09 Dana Corp Pressure vessel assembly for integrated pressurized fluid system
US8079408B2 (en) 2003-09-22 2011-12-20 Bosch Rexroth Corporation Pressure vessel assembly for integrated pressurized fluid system
EP1520995A2 (en) * 2003-09-29 2005-04-06 Fluid House Oy Hydraulic apparatus and method for manufacturing and using thereof
EP1520995A3 (en) * 2003-09-29 2006-04-12 Fluid House Oy Hydraulic apparatus and method for manufacturing and using thereof
US7611337B2 (en) 2003-12-19 2009-11-03 Annovi Reverberi S.P.A. Hydraulic pump
US20050135953A1 (en) * 2003-12-19 2005-06-23 Annovi Reverberi S.P.A. Hydraulic pump
US7658597B2 (en) 2004-08-02 2010-02-09 Annovi Reverberi S.P.A. Pump body with plunger pistons
US20060024173A1 (en) * 2004-08-02 2006-02-02 Annovi Reverberi S.P.A. Pump body with plunger pistons
CN101885075A (zh) * 2010-07-01 2010-11-17 东南大学 一种用于控制立式机床主轴箱热变形的空冷装置
CN101885075B (zh) * 2010-07-01 2012-05-23 东南大学 一种用于控制立式机床主轴箱热变形的空冷装置
WO2015026558A1 (en) * 2013-08-22 2015-02-26 Stanley Black & Decker, Inc. Hydraulic power unit
US20150375966A1 (en) * 2014-06-30 2015-12-31 Thyssenkrupp Elevator Corporation Noise Abatement for Elevator Submersible Power Units
US11958177B2 (en) 2018-09-07 2024-04-16 Milwaukee Electric Tool Corporation Hydraulic piston pump for a hydraulic tool
CN114278629A (zh) * 2021-11-24 2022-04-05 中联重科土方机械有限公司 液压油箱、液压系统和液压油箱的气压平衡方法
CN114278629B (zh) * 2021-11-24 2024-03-22 中联重科土方机械有限公司 液压油箱、液压系统和液压油箱的气压平衡方法

Also Published As

Publication number Publication date
GB1329395A (en) 1973-09-05
DE2207678A1 (de) 1972-09-14
SE372599B (it) 1974-12-23
JPS4710902U (it) 1972-10-09

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