GB1498304A - Hydraulic fluid pressure installations in vehicles - Google Patents

Hydraulic fluid pressure installations in vehicles

Info

Publication number
GB1498304A
GB1498304A GB62276A GB62276A GB1498304A GB 1498304 A GB1498304 A GB 1498304A GB 62276 A GB62276 A GB 62276A GB 62276 A GB62276 A GB 62276A GB 1498304 A GB1498304 A GB 1498304A
Authority
GB
United Kingdom
Prior art keywords
valve
fluid
pump
throttle
prime mover
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
GB62276A
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.)
Eaton GmbH
Original Assignee
Eaton GmbH
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 Eaton GmbH filed Critical Eaton GmbH
Publication of GB1498304A publication Critical patent/GB1498304A/en
Expired legal-status Critical Current

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
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

1498304 Fluid-pressure servomotor systems EATON GmbH 8 Jan 1976 [10 Jan 1975] 00622/76 Heading G3P A hydraulic system for a vehicle comprises a prime mover 1 supplying power to a vehicle drive 30 and to a hydraulic power-consuming device 20 and means responsive when excess power demand is made on the prime mover to limit the quantity of fluid supplied to the device 20. The prime mover 1 drives pumps 2 and 3, and fluid from the pump 2 is directed by shuttle valve 17 to the device 20 via the central passage of a control valve 12 and a throttle 35 which is spring-biased to a fully open position. The output of the pump 3 is vented to the tank through annular passage 25 in axiallymovable member 24 of the valve 12. When the flow through the central passage of the valve 12 exceeds a first level the member 24 is moved to obstruct the fluid from the pump 3, which flows through non-return valve 8 to reinforce the fluid from the pump 2; when the flow exceeds a second level spring-loaded throttle member 27 of the valve 12 is moved to allow the fluid to by-pass throttle opening 28. If the pressure in hydrostatic vehicle drive 30 becomes excessive the shuttle valve 31 is actuated so that this pressure acts on fluid motor 33 to reduce the opening of the throttle 35, the resulting reduction in flow through the valve 12 allowing the member 24 to return and allow the venting of the output of the pump 3, thus reducing the load on the prime mover 1. The return flow from the device 20 may by-pass the throttle 35 through non-return valve 36. In another embodiment, Fig. 2 (not shown), if the speed of the prime mover 1 falls below a safe minimum level, centrifugally-operated switch (44) is opened, causing valve (38) to open a passage (39) in parallel with the valve 12 to vent the fluid from the pump 3 to the tank. Also, if break switches (42), (49) are opened, for example upon reception by the vehicle of a load, then the valve (38) will open the passage (39) and a throttle (40) will limit the flow from the valve 12 to the device 20.
GB62276A 1975-01-10 1976-01-08 Hydraulic fluid pressure installations in vehicles Expired GB1498304A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752500863 DE2500863A1 (en) 1975-01-10 1975-01-10 HYDRAULIC SERVO SYSTEM FOR MOBILE WORK MACHINES, IN PARTICULAR PULL-LOADERS

Publications (1)

Publication Number Publication Date
GB1498304A true GB1498304A (en) 1978-01-18

Family

ID=5936234

Family Applications (1)

Application Number Title Priority Date Filing Date
GB62276A Expired GB1498304A (en) 1975-01-10 1976-01-08 Hydraulic fluid pressure installations in vehicles

Country Status (3)

Country Link
DE (1) DE2500863A1 (en)
FR (1) FR2297339A1 (en)
GB (1) GB1498304A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2950391A1 (en) * 1979-12-14 1981-07-09 Linde Ag, 6200 Wiesbaden Utility vehicle hydrostatic drive - has main circuit and auxiliary circuit linked to drive by priority valves
DE4026695C2 (en) * 1989-08-25 1995-04-20 Toyoda Automatic Loom Works Hydraulic fluid flow control for a hydraulic system of an industrial vehicle
US5381822A (en) * 1993-11-26 1995-01-17 Dana Corporation Relief valve with hydraulic fuse
DE10039936A1 (en) * 2000-08-16 2002-03-07 Fluidtech Gmbh Valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1599352A (en) * 1968-03-13 1970-07-15
DE2158870C2 (en) * 1971-11-27 1973-09-27 Eaton Gmbh, 5620 Velbert Hydraulic servo system with two pumps and several hydraulic motors

Also Published As

Publication number Publication date
FR2297339B1 (en) 1980-03-28
DE2500863A1 (en) 1976-07-15
FR2297339A1 (en) 1976-08-06

Similar Documents

Publication Publication Date Title
US4343151A (en) Series - parallel selector for steering and implement
US3535877A (en) Three-pump hydraulic system incorporating an unloader
US4481769A (en) Control system for hydraulically driven vehicles
US3125324A (en) Vivier
US4300652A (en) Soft shift reversing control system
EP0059406A1 (en) Flushing valve system in closed circuit hydrostatic power transmission
EP0056865B1 (en) Hydraulic power system
GB1056583A (en) Automatic transmission
EP0068197B1 (en) Locking apparatus of inertial mass drive hydraulic circuit system
GB1419719A (en) Vehicle power steering including safety backup system
GB1283208A (en) Improvements in and relating to hydraulic installations
GB1525003A (en) Automatic control for a power unit consisting of an internal combustion engine and a hydrostatic transmission
GB1498304A (en) Hydraulic fluid pressure installations in vehicles
GB1315107A (en) Power steering system affording emergency steering capability
EP0184284A1 (en) Control system for a hydraulic circuit of a vehicle
US4317499A (en) Vehicle emergency steering system
GB1470430A (en) Hydraulic transmission
KR830006049A (en) Electro-Hydraulic Power Handle Control
US2669096A (en) Temperature compensated force and motion transmitting system
US3091929A (en) Regenerative hydraulic circuit
ES344364A1 (en) Fluid system for independent operation of two fluid motors
GB947316A (en) Vibration-responsive control system
US3005463A (en) Power transmission
GB1477920A (en) Steering system with auxiliary fluid pressure reservoir
GB1133669A (en) Speed control systems for engine-driven vehicles

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee