GB1421177A - Hydraulically operated excavators and the like - Google Patents

Hydraulically operated excavators and the like

Info

Publication number
GB1421177A
GB1421177A GB5757972A GB5757972A GB1421177A GB 1421177 A GB1421177 A GB 1421177A GB 5757972 A GB5757972 A GB 5757972A GB 5757972 A GB5757972 A GB 5757972A GB 1421177 A GB1421177 A GB 1421177A
Authority
GB
United Kingdom
Prior art keywords
valve
valves
fluid
motor
pilot
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
GB5757972A
Other languages
English (en)
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Publication of GB1421177A publication Critical patent/GB1421177A/en
Expired legal-status Critical Current

Links

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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
GB5757972A 1971-12-13 1972-12-13 Hydraulically operated excavators and the like Expired GB1421177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20702771A 1971-12-13 1971-12-13

Publications (1)

Publication Number Publication Date
GB1421177A true GB1421177A (en) 1976-01-14

Family

ID=22768908

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5757972A Expired GB1421177A (en) 1971-12-13 1972-12-13 Hydraulically operated excavators and the like

Country Status (7)

Country Link
JP (1) JPS5517246B2 (enrdf_load_stackoverflow)
BE (1) BE792617A (enrdf_load_stackoverflow)
CA (1) CA982089A (enrdf_load_stackoverflow)
DE (1) DE2261627C2 (enrdf_load_stackoverflow)
FR (1) FR2163588B1 (enrdf_load_stackoverflow)
GB (1) GB1421177A (enrdf_load_stackoverflow)
SE (1) SE394304B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004042235A1 (de) * 2002-11-07 2004-05-21 Bosch Rexroth Ag Hydraulisches zweikreisbremssystem
CN1327139C (zh) * 2002-11-07 2007-07-18 博世力士乐股份有限公司 液压双回路系统

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990236A (en) * 1976-02-23 1976-11-09 Caterpillar Tractor Co. Load responsive pump controls of a fluid system
US3998053A (en) * 1976-03-15 1976-12-21 Caterpillar Tractor Co. Three-pump - three-circuit fluid system of a work vehicle having controlled fluid-combining means
US4078681A (en) * 1976-08-24 1978-03-14 Caterpillar Tractor Co. Dual pump hydraulic control system with predetermined flow crossover provision
JPS5847109Y2 (ja) * 1977-10-31 1983-10-27 株式会社クボタ バックホウ兼ド−ザ作業車の回路構造
US4214445A (en) * 1979-05-14 1980-07-29 Dresser Industries, Inc. Hydraulic circuitry for raise drill apparatus
JPS6129813Y2 (enrdf_load_stackoverflow) * 1980-07-07 1986-09-02
JPS6138204A (ja) * 1984-07-30 1986-02-24 Toshiba Mach Co Ltd 多連油圧切換弁のための多連パイロツト弁
GB2395769C (en) * 2002-11-27 2006-02-08 Komatsu Mfg Co Ltd Cavitation prevention system of hydraulic travelling vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD80869A (enrdf_load_stackoverflow) *
AT243194B (de) * 1963-04-24 1965-10-25 Orenstein & Koppel Ag Schaltung für Hydraulikbagger
DE1634915C3 (de) * 1967-03-10 1981-02-12 O & K Orenstein & Koppel Ag Schaltung für Hydraulikbagger
AT291330B (de) * 1968-06-15 1971-07-12 Frisch Geb Kg Eisenwerk Hydraulische Betätigungsvorrichtung für die Arbeitswerkzeuge von Erdbearbeitungsmachinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004042235A1 (de) * 2002-11-07 2004-05-21 Bosch Rexroth Ag Hydraulisches zweikreisbremssystem
CN1327139C (zh) * 2002-11-07 2007-07-18 博世力士乐股份有限公司 液压双回路系统

Also Published As

Publication number Publication date
FR2163588B1 (enrdf_load_stackoverflow) 1981-04-30
JPS4865702A (enrdf_load_stackoverflow) 1973-09-10
CA982089A (en) 1976-01-20
DE2261627A1 (de) 1973-06-28
DE2261627C2 (de) 1983-10-20
SE394304B (sv) 1977-06-20
BE792617A (fr) 1973-06-12
JPS5517246B2 (enrdf_load_stackoverflow) 1980-05-10
FR2163588A1 (enrdf_load_stackoverflow) 1973-07-27

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Legal Events

Date Code Title Description
49R Reference inserted (sect. 9/1949)
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee