US3093115A - Fluid actuated control mechanism for a brake and similar apparatus - Google Patents

Fluid actuated control mechanism for a brake and similar apparatus Download PDF

Info

Publication number
US3093115A
US3093115A US3584A US358460A US3093115A US 3093115 A US3093115 A US 3093115A US 3584 A US3584 A US 3584A US 358460 A US358460 A US 358460A US 3093115 A US3093115 A US 3093115A
Authority
US
United States
Prior art keywords
piston
cylinder
hub
annular
pistons
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 - Lifetime
Application number
US3584A
Other languages
English (en)
Inventor
Alfieri Giuseppe
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.)
Industrie Magneti Marelli SRL
Marelli Europe SpA
Original Assignee
Magneti Marelli SpA
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 Magneti Marelli SpA filed Critical Magneti Marelli SpA
Application granted granted Critical
Publication of US3093115A publication Critical patent/US3093115A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/08—Brake cylinders other than ultimate actuators
    • B60T17/10—Two or more cylinders acting on the same brake with means for rendering them effective selectively or successively, the number of effective cylinders being variable

Definitions

  • the pistons In known dual action fluid pressure actuators of this type, the pistons have a very substantial axial length and thus occupy a good portion of the total length of the cylinder. To obtain the required actuating force with the thus relatively short available stroke, the diameters of the pistons and cylinders must be substantially increased. This increases the total area of contact between the cylinders and the pistons, requiring very accurate fitting of the parts for proper operation. In addition, the arrangements are bulky and cumbersome.
  • the single figure is an axial sectional view of a dual action fluid pressure actuator embodying the invention.
  • the fluid pressure actuator of the invention includes a cylinder 1 in which are mounted, for axial sliding movement, a service piston S and an emergency piston S
  • a service pressure fluid inlet nipple 2 and an emergency pressure fluid inlet nipple 3 are mounted through the end wall F of cylinder 1, nipple 2 being disposed substantially coaxially of the cylinder and nipple 3 being offset radially from nipple 2.
  • a relatively small diameter tubular rod or conduit 4 has its outer end seated in and connected in fluid tight relation to the nipple 2, and is disposed, with annular clearance, through a relatively larger diameter tubular rod or conduit 6, the annular clearance or passage between conduits or rods 4 and 6 being indicated at 5.
  • a piston rod including generally tubular sleeve 7, extends through the other end of the cylinder 1 and a plug or diaphragm is secured in fluidatight relation in the inner end of sleeve 7.
  • the conduit or tubular rod 6 is secured in fluid-tight relation in an axial recess in the end of plug or diaphragm 8, and the opposite end of tubular rod or conduit 6 is anchored, in fluid tight relation, in the central passage through the annular piston 8,.
  • conduit 4 which is immov- "ice able relative to cylinder 1
  • the inner end of conduit 4 terminates somewhat short of the inner end of conduit 6 and of the base of the recess in plug or diaphragm 8, to establish communication between the interior of conduit 4 and the annular space 5.
  • a push rod P has its inner end seated in a concave crecess in the opposite end of the plug or diaphragm 8, and the outer end of push rod P is formed with an eye 10 for connection to the mechanism or apparatus to be actuated.
  • a suitable packing 9 is disposed between the end wall of a reduced diameter extension from the cylinder 1 and the outer surface of tubular sleeve 7 of the piston rod.
  • the service piston S and the emergency piston S have a very short axial length, the combined axial length occupying only a small portion of the total axial length of the cylinder 1.
  • the axially very short peripheries of the two annular pistons S and S are indicated at M and M and it will be noted that, in each case, the axial length is only just sufficient to provide a suitable seat for the packing rings g and g of the two annular pistons.
  • the service piston S which is nearer to the piston rod 7, has its web deflected out of an axial plane and extending toward the web of the emergency piston S to provide an abutment projecting axially beyond one end of the peripheral surface M Nevertheless, the extent of the deflection of the web of annular piston S is such that there is a clearance space between this web and the radially or diametrically extending web of the piston S This clearance space forms a first pressure chamber C, for connection to a source of fluidunder pressure for application of service fluid pressure.
  • the emergency piston S has a central annular extension which extends outwardly toward end wall F a greater distance than does the rim portion M of piston S to abut the end wall F and maintain a "clearance between the latter and the rim portion M of the piston S
  • the emergency application nipple 3 communicates with the second pressure chamber C which is the working chamber tor the emergency piston S
  • a fluid tight packing g' is disposed between a second central annular exacts to force the emergency piston S toward the wall F and to force the service piston S inwardly, thus moving the push rod P, and the eye 10, toward the right as viewed in the drawing.
  • the rims M and M are in abutment so that the inward movement of the emergency piston S is transmitted to the service piston S and thus to the piston rod 7 and the push rod P having the connection eye 10.
  • the aforemen- 3 tioned coil spring restores the parts to the position shown in the drawing.
  • the total surface area of contact between the pistons and the cylinder is greatly reduced, particularly in an axial direction.
  • the degree of accurate machining involved is also greatly reduced.
  • a dual action fluid pressure actuator for brakes and similar apparatus comprising, in combination, a relatively elongated cylinder; a first annular piston slidable axially in said cylinder, and having a relatively large diameter rim, a relatively smaller diameter hub, and a generally radially extending web interconnecting said rim and said hub; a piston rod extending through one end of said cylinder and having an outer end formed for connection to the apparatus to be actuated; a first tubular rod connected at one end to the inner end of said piston rod and having its opposite end connected to the inner end of said hub of said first piston and communicating with the opening through the latter; the outer end of the hub of said first piston having a substantially centrally axially extending annular recesstherein, and the major portion of the outer surface of the web of said first piston being substantially flush with the outer end of the hub thereof; a second annular piston slidable axially in said cylinder and disposed between said first piston and the opposite end of said cylinder said second piston having a relatively large
  • said piston rod includinug a plug having an axial recess in which said one end of said first tubular rod is seated and secured and into which the inner end of said second tubular rod partially extends, a tubular sleeve embracing said plug and extending through such one end of said cylinder, and a push rod seated in a recess in the other end of said plug and having its outer end formed for such connection to the apparatus to be actuated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Actuator (AREA)
US3584A 1959-01-31 1960-01-20 Fluid actuated control mechanism for a brake and similar apparatus Expired - Lifetime US3093115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1597259 1959-01-31

Publications (1)

Publication Number Publication Date
US3093115A true US3093115A (en) 1963-06-11

Family

ID=11148412

Family Applications (1)

Application Number Title Priority Date Filing Date
US3584A Expired - Lifetime US3093115A (en) 1959-01-31 1960-01-20 Fluid actuated control mechanism for a brake and similar apparatus

Country Status (3)

Country Link
US (1) US3093115A (de)
DE (1) DE1185934B (de)
FR (1) FR1245144A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3264951A (en) * 1964-01-17 1966-08-09 Berg Mfg & Sales Co Brake actuator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1387663A (fr) * 1963-04-06 1965-01-29 Magneti Marelli Spa Dispositif à double effet, pour la commande de freins par un fluide sous pression
DE1229863B (de) * 1963-11-12 1966-12-01 Westinghouse Bremsen Apparate Druckmittelzweikreisbremse, insbesondere fuer Kraftfahrzeuge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB625711A (en) * 1947-05-08 1949-07-01 Automotive Prod Co Ltd Improvements in or relating to fluid pressure operated ram-and-cylinder devices
GB705403A (en) * 1951-04-23 1954-03-10 Davey Paxman And Company Ltd Improvements in or relating to the remote control of mechanisms
GB743603A (en) * 1954-05-25 1956-01-18 Benton & Stone Ltd Fluid-operated reciprocatory mechanisms
US2831464A (en) * 1954-02-19 1958-04-22 Gen Motors Corp Fluid pressure motor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1558374A (en) * 1924-09-08 1925-10-20 Lengel Company Air-brake mechanism
DE735807C (de) * 1941-09-30 1943-05-26 Bosch Gmbh Robert Staubabdichtung fuer Bremszylinder, insbesondere fuer Strassenfahrzeuge
DE872453C (de) * 1943-06-22 1953-04-02 Bosch Gmbh Robert Bremszylinder, insbesondere fuer Druckmittel-Kraftfahrzeugbremsen
FR1146357A (fr) * 1956-03-30 1957-11-12 Westinghouse Freins & Signaux Perfectionnements aux équipements de freinage pour véhicules sur rail ou sur route

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB625711A (en) * 1947-05-08 1949-07-01 Automotive Prod Co Ltd Improvements in or relating to fluid pressure operated ram-and-cylinder devices
GB705403A (en) * 1951-04-23 1954-03-10 Davey Paxman And Company Ltd Improvements in or relating to the remote control of mechanisms
US2831464A (en) * 1954-02-19 1958-04-22 Gen Motors Corp Fluid pressure motor
GB743603A (en) * 1954-05-25 1956-01-18 Benton & Stone Ltd Fluid-operated reciprocatory mechanisms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3264951A (en) * 1964-01-17 1966-08-09 Berg Mfg & Sales Co Brake actuator

Also Published As

Publication number Publication date
DE1185934B (de) 1965-01-21
FR1245144A (fr) 1960-11-04

Similar Documents

Publication Publication Date Title
US3186521A (en) Automatic adjusting devices for brake actuating mechanisms
US4042072A (en) Piston-cylinder unit for use in a disc brake assembly
US4257312A (en) Tandem diaphragm brake booster
US4531370A (en) Brake actuation assembly
JP2788115B2 (ja) 自動車用負圧制動力ブースタ
JPS6218764B2 (de)
US4423665A (en) Mechanically controllable power booster
KR870003909A (ko) 진공작동식 브레이크 파워부우스터
US3093115A (en) Fluid actuated control mechanism for a brake and similar apparatus
US3026853A (en) Booster motor mechanism
US2768710A (en) Disc type brake for vehicles
JP2004521815A (ja) ラジアル方向に密閉されたエアブレーキチャンバ
JP2006188207A (ja) 自動車用ブレーキ装置の空気圧作動ブースター
US3017866A (en) Fluid pressure operated motor
US2989033A (en) Booster motor mechanism
US2997027A (en) Motor mechanism having resilient reaction means
US3577832A (en) Fluid pressure operated servo devices
US3614911A (en) Brake booster
US4509800A (en) Brake pressure control valve of a double piping system
US3120155A (en) Vehicle brake mechanism with pedal leverage changing means
JP4977301B2 (ja) 出力プッシュロッド及びスプリングリテーナー
JP4767402B2 (ja) マスタシリンダ
JPS6153565B2 (de)
US2990815A (en) Booster motor mechanism
US3187850A (en) Annular motor actuated drum brake mechanism