GB725378A - Improvements in or relating to hydraulic control apparatus - Google Patents

Improvements in or relating to hydraulic control apparatus

Info

Publication number
GB725378A
GB725378A GB13076/53A GB1307653A GB725378A GB 725378 A GB725378 A GB 725378A GB 13076/53 A GB13076/53 A GB 13076/53A GB 1307653 A GB1307653 A GB 1307653A GB 725378 A GB725378 A GB 725378A
Authority
GB
United Kingdom
Prior art keywords
ports
control valve
motor
valve
pass
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
GB13076/53A
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.)
Navistar Inc
Original Assignee
International Harverster Corp
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 International Harverster Corp filed Critical International Harverster Corp
Publication of GB725378A publication Critical patent/GB725378A/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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/12—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which both the controlling element and the servomotor control the same member influencing a fluid passage and are connected to that member by means of a differential gearing

Abstract

725,378. Fluid-pressure servomotor-control systems. INTERNATIONAL HARVESTER CO. May 11, 1953 [May 13, 1952], No. 13076/53. Class 135. In hydraulic control apparatus such as is employed for the raising and lowering of agricultural implements, a control valve for a hydraulic motor 17 has lands 43, 44 controlling ports 39, 41 leading to opposite ends of the motor, and a third land 42 controlling a plunger which operates a by-pass valve 83 in a conduit 23, 25 connecting a hydraulic supply pump P with an inlet chamber 35 of the control valve whereby the by-pass valve is opened when the control valve is in neutral position closing the ports 39, 41. Chambers 45, 47, 48 are interconnected by drillings 49, 51, 52 and lead to exhaust through the right-hand, open, end of the bore housing the control valve. A passage 91, 95, incorporating a restriction 94 leads from the pump delivery to ports 36 controlled by the land 42, and the plunger for operating the by-pass valve is exposed to the pressure in the section 95. Movement of the control valve opens the passage 91, 95 to exhaust to allow a spring 84 to close the by-pass valve. The ports 39, 41 connect with the motor 17 through passages 54, 55, check valves 56, 57 and passages 72, 75, the check valves causing the motor to be hydraulically locked when the control valve is in neutral position. Pressure fluid in either passage 54, 55 opens the corresponding check valve to pass to one end of the motor and also moves a plunger 65 to open the other check valve so that the other end of the motor may exhaust. The ports 39, 41 are supplemented by smaller ports (not shown) which are offset in the axial direction of the control valve so as to be opened slightly in advance of the main ports 39, 41. The control valve is actuated through differential gearing 96 and is returned to neutral position by a feedback linkage 104 between the member operated by the motor 17 and the differential gearing.
GB13076/53A 1952-05-13 1953-05-11 Improvements in or relating to hydraulic control apparatus Expired GB725378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US725378XA 1952-05-13 1952-05-13

Publications (1)

Publication Number Publication Date
GB725378A true GB725378A (en) 1955-03-02

Family

ID=22108238

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13076/53A Expired GB725378A (en) 1952-05-13 1953-05-11 Improvements in or relating to hydraulic control apparatus

Country Status (1)

Country Link
GB (1) GB725378A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935850A (en) * 1956-07-02 1960-05-10 Sigma Hydraulic control systems for agricultural tractors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935850A (en) * 1956-07-02 1960-05-10 Sigma Hydraulic control systems for agricultural tractors

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