GB972575A - Improvements in control apparatus for hydraulic circuits - Google Patents

Improvements in control apparatus for hydraulic circuits

Info

Publication number
GB972575A
GB972575A GB1642763A GB1642763A GB972575A GB 972575 A GB972575 A GB 972575A GB 1642763 A GB1642763 A GB 1642763A GB 1642763 A GB1642763 A GB 1642763A GB 972575 A GB972575 A GB 972575A
Authority
GB
United Kingdom
Prior art keywords
valve
actuator
holes
pump
exhaust
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
GB1642763A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB972575A publication Critical patent/GB972575A/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
    • 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
    • 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
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

972,575. Fluid-pressure servomotor systems. ROBERT BOSCH G.m.b.H. April 26,1963 [April 28, 1962], No. 16427/63. Heading G3P. A hydralic actuator 7 operating e.g. an agricultural earth-moving implement is controlled by a valve apparatus comprising an exhaust valve 48 which is opened by an abutment 51 to exhaust the actuator on rightward movement of a pilot valve 19, and a plunger valve 36 controlled by the valve 19 within which it is slidable and controlling an exhaust passage from a conduit 2,12, 42 leading from a pump 3 past a pressure relief valve 18 and through a check valve 43 to the actuator. With the parts in the positions shown pump pressure in the conduit 12 and in an annular recess 13 can pass by way of external flats 33 on the valve 19 and holes 34 to a chamber within the valve 19 to hold the valve 36 against a loading spring 39 so that fluid from the pump can escape through holes 40 to a drain chamber 15. Leftward movement of the valve 19 cuts off the flats 33 from the recess 13 and connects them to drain through an annular groove 32 so that the valve 36 is moved by its spring to close the holes 40 and thereby cause the pumped fluid to open the check valve 43 and extend the actuator. Shock due to sudden closure of the valve 36 is prevented by the provision of a throttled escape path constituted by grooves 52 in the valve 19 and arranged to be closed if the valve moves sufficiently to the left. The escape path may include a throttled passage in the housing or it may be provided by longitudinal grooves in the valve 19 which are curved or stepped to give gradual closure. Actuation of the valve 19 is by a cam shaped element 23 interposed between a pin 20 on the valve and a lever 25 of a follow-up connection 27, 28, 29 from the actuator. As shown, the element 23 is eccentrically connected to the spindle 21 of a lever 22 for manual actuation but it may be operated by means responsive to the depth of the implement in the ground or its drag.
GB1642763A 1962-04-28 1963-04-26 Improvements in control apparatus for hydraulic circuits Expired GB972575A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB67024A DE1204034B (en) 1962-04-28 1962-04-28 Control device for a hydraulic working group

Publications (1)

Publication Number Publication Date
GB972575A true GB972575A (en) 1964-10-14

Family

ID=6975358

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1642763A Expired GB972575A (en) 1962-04-28 1963-04-26 Improvements in control apparatus for hydraulic circuits

Country Status (4)

Country Link
AT (1) AT239577B (en)
CH (1) CH402538A (en)
DE (1) DE1204034B (en)
GB (1) GB972575A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011915Y1 (en) * 1969-10-31 1975-04-12
JPS5018077Y1 (en) * 1969-10-31 1975-06-03
DE2034214C3 (en) * 1970-07-10 1981-11-12 Robert Bosch Gmbh, 7000 Stuttgart Pilot operated directional valve for a hydraulic servo motor

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE314523C (en) *
GB559410A (en) * 1941-12-26 1944-02-17 Vinco Corp Improvements in sequence valves
DE802298C (en) * 1948-10-09 1951-02-08 Elektro Mechanik G M B H Hydraulic slide control with pilot control
DE1024740B (en) * 1955-01-27 1958-02-20 Robert Jean Busquet Hydraulic lifting device for agricultural equipment
DE1074346B (en) * 1955-02-21 1960-01-28 Bendix Aviation Corporation, New York, N. Y. (V. St. A.) Piston valve
DE1027951B (en) * 1956-07-09 1958-04-10 Karlsruhe Augsburg Iweka Hydraulic quick control with device to avoid steering knocks
DE1101887B (en) * 1956-07-20 1961-03-09 Clarence Walter Tydeman Hydraulic control device
US2949097A (en) * 1957-12-11 1960-08-16 New York Air Brake Co Five position control valve having power float position
DE1097228B (en) * 1958-09-15 1961-01-12 New York Air Brake Internat Control spool

Also Published As

Publication number Publication date
AT239577B (en) 1965-04-12
DE1204034B (en) 1965-10-28
CH402538A (en) 1965-11-15

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