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GB1117873A - Improvements in or relating to hydraulic transmissions - Google Patents

Improvements in or relating to hydraulic transmissions

Info

Publication number
GB1117873A
GB1117873A GB16282/66A GB1628266A GB1117873A GB 1117873 A GB1117873 A GB 1117873A GB 16282/66 A GB16282/66 A GB 16282/66A GB 1628266 A GB1628266 A GB 1628266A GB 1117873 A GB1117873 A GB 1117873A
Authority
GB
United Kingdom
Prior art keywords
pump
pressure
return
ducts
motor
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
GB16282/66A
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.)
C Van der Lely NV
Original Assignee
C Van der Lely NV
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 C Van der Lely NV filed Critical C Van der Lely NV
Publication of GB1117873A publication Critical patent/GB1117873A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
    • F16H61/4139—Replenishing or scavenging pumps, e.g. auxiliary charge pumps
    • 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
    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • F15B7/006—Rotary pump input
    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/008—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors with rotary output
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Fluid Gearings (AREA)
  • Motor Power Transmission Devices (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

1,117,873. Hydrostatic transmission. C. VAN DER LELY N.V. 13 April, 1966 [3 May, 1965], No. 16282/66. Heading F2C. Relates to an infinitely variable hydrostatic transmission, particularly for an agricultural tractor, comprising a rotating barrel swashplate pump 1 in closed circuit with a rotating barrel swashplate motor 2, the pump and/or motor swashplate tilt being variable. In such a transmission, to ensure that at least most of fresh cool oil supplied from a make-up pump 13 to the low-pressure motor-pump return flow path is circulated through the transmission before being drained as excess to a reservoir 15, said return flow path comprises two ducts respectively communicating with said make-up pump and said reservoir. In the transmission shown, the pump 1 is driven by an internal combustion engine or other source of rotating power and the motor 2 drives one or more ground-engaging wheels. The operation of the pump and/or motor can be arranged to reverse the vehicle, hence the highpressure flow and low-pressure return paths are interchangeable and each comprises two ducts 3, 4 and 5, 6 or vice versa. The make-up pump 13 supplies the low pressure, return, one of the ducts 3, 6 through a duet 9 and either one of oneway valves 10, 11 (that to the high-pressure flow duct closing), and excess is drained from the low pressure, return, one of the ducts 4, 5 to the reservoir 15 through a shuttle valve 17 (closing to the high-pressure flow duct), a duct 19 and a one-way valve 20 which, opening at a predetermined pressure, determines maximum pressure in the low-pressure return path. A further one-way valve 22, opening at a predetermined pressure, connects the ducts 9, 19 in the event of a duct blockage or valve failure. A cooling heat exchanger may be included in the make-up pump supply or delivery duct.
GB16282/66A 1965-05-03 1966-04-13 Improvements in or relating to hydraulic transmissions Expired GB1117873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL656505584A NL144371B (en) 1965-05-03 1965-05-03 SWITCH GEAR.

Publications (1)

Publication Number Publication Date
GB1117873A true GB1117873A (en) 1968-06-26

Family

ID=19793071

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16282/66A Expired GB1117873A (en) 1965-05-03 1966-04-13 Improvements in or relating to hydraulic transmissions

Country Status (3)

Country Link
DE (1) DE1550830C3 (en)
GB (1) GB1117873A (en)
NL (1) NL144371B (en)

Also Published As

Publication number Publication date
NL6505584A (en) 1966-11-04
DE1550830C3 (en) 1978-05-11
NL144371B (en) 1974-12-16
DE1550830B2 (en) 1974-09-05
DE1550830A1 (en) 1969-07-31

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