US3850080A - Seal for non-bottoming piston cylinder assembly - Google Patents

Seal for non-bottoming piston cylinder assembly Download PDF

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Publication number
US3850080A
US3850080A US00345825A US34582573A US3850080A US 3850080 A US3850080 A US 3850080A US 00345825 A US00345825 A US 00345825A US 34582573 A US34582573 A US 34582573A US 3850080 A US3850080 A US 3850080A
Authority
US
United States
Prior art keywords
piston
annular
head
seal
rod
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
US00345825A
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English (en)
Inventor
G Ekstrom
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.)
Yale Materials Handling Corp
Original Assignee
Eaton 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 Eaton Corp filed Critical Eaton Corp
Priority to US00345825A priority Critical patent/US3850080A/en
Priority to GB1345974A priority patent/GB1406023A/en
Priority to DE2414787A priority patent/DE2414787A1/de
Priority to JP3513274A priority patent/JPS5647405B2/ja
Application granted granted Critical
Publication of US3850080A publication Critical patent/US3850080A/en
Assigned to YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND 31 FLEMINGTON NEW JERSEY 08822 reassignment YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND 31 FLEMINGTON NEW JERSEY 08822 ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EATON CORPORATION
Assigned to CITICORP NORTH AMERICA, INC., AS AGENT reassignment CITICORP NORTH AMERICA, INC., AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YALE MATERIALS HANDLING CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general

Definitions

  • the invention relates generally to a piston cylinder assembly and, more particularly, to a seal to prevent bottoming of the piston against one of the cylinder heads.
  • Piston cylinder assemblies of known design do not operate in a manner that is satisfactory for use with a Hancock type apparatus. As previously described, a standard piston cylinder assembly will bottom. Cushioning piston cylinder assemblies are designed for uniform deceleration and gradual stopping of the piston with minimum impact between the piston and the cylinder head at the end of the stroke. Such impact is, nevertheless, bottoming, which is detrimental to reliable operation ofthe valve. Piston cylinder assemblies with external stops do prevent contact between the piston and the cylinder head. The force on the push rod, however, is transmitted through the external stop to the cylinder and not through the fluid again making the valve ineffective during certainconditions of operation.
  • annular resilient member encircles the push rod of the piston cylinder assembly and has an annular radially inwardly extending foot located within an annular external groove in the rod and an end which encompasses and seals an annular passage defined by the push rod and the cylinder head.
  • a cupshaped opening is defined in the piston and the annular resilient member is generally located within the opening with the end extending beyond the face of the piston toward the annular passage.
  • FIGURE of the drawings comprises a side elevational view, in longitudinal section, of a nonbottoming piston cylinder assembly according to the invention.
  • a piston cylinder assembly 10 is illustrated in the drawing.
  • the assembly includes a cylinder 12 made up of an annular body portion 14 defining a cylindrical cavity 16.
  • Body portion 14 is enclosed by first and second cylinder heads 18 and 20 in a known manner.
  • a piston 22 is in sliding engagement with the cavity defining surface of body portion 14 and divides cavity 16 into first and second chambers 24 and 26.
  • Annular resilient seals 28, of a known design are engaged with piston 22 and prevent fluid from flowing between chambers 24 and 26.
  • Push rod 30 includes a shoulder 32 in abutting'engagement with a washer 33 which contacts piston 22.
  • a nut 34 is in threaded engagement with push rod 30 and secures the rod and piston together in a known manner.
  • a number of annular resilient seals 36 are mounted in head 18 in encircling relationship to push rod 30. Seals 36 prevent fluid from flowing out of chamber 24 around push rod 30.
  • a rod wiper 37 is used to wipe off dirt during retraction of rod 30.
  • An annular plate 38 is secured to head 18 by a number of screws 40, only one shown, that are circumferentially spaced around push rod 30.
  • An annular opening 42 in plate 38 defines an annular passage between push rod 30 and plate 38 that communicates with chamber 24 and an annular cavity 44 in head 18. Passage 46 is used for the introduction and removal of fluid from chamber 24.
  • Annular resilient seals 48 are located between plate 38 and head 18 to prevent fluid from flowing therebetween.
  • a sensing passage 50 is located in head 18 and communicates with chamber 24 and the exterior of cylinder 12. Passage 50 is located so that it is always in communication with chamber 24.
  • Feed passage 52 and sensing passage 54 are located in head 20 and communicate with the exterior of cylinder 12 and chamber 26. Passage 52 is used for the introduction and removal of fluid into and out of second chamber 26. Passage 54 is located so that it is always in communication with chamber 26.
  • sensing passages 50 and 54 of the disclosure would be respectively connected to feed lines and 4.
  • feed passages 46 and 52 of the disclosure would be respectively connected to feed lines 17 and 4.
  • Piston 22 includes an annular cavity 56 defined by the outer surface of a frustum of a cone. Annular cavity 56 is concentric with push rod 30 and diverges in crosssectional area from left to right in the drawing. At the left-hand end of cavity 56 there is located a cylindrical surface 58 defined by piston 22. Juxtaposition surface 58 is located an annular groove 60 defined by push'rod 30. Groove 60 is spaced radially inwardly toward the axis of push rod 30 away from surface 58. The diameter of the inner surface of groove 60 is less than the outer diameter of the push rod.
  • a resilient seal 62 has an inner end 64 defining an annular radially inwardly extending foot that is located within groove 60. The outer end 66 of seal 62 projects outwardly into chamber 24 away from the face 68 ofthe piston. The outer diameter of outer end 66 of seal 62 is greater than the outer diameter of annular opening 42 to allow seal 62 to encompass annular opening 42.
  • passages 50 and 54 are primarily used to transmit, to a pressure sensitive device, the pressures of the fluids existing, respectively, in chambers 24 and 26.
  • seal 62 When opening 42 is sealed, fluid is no longer permitted to flow out of first chamber 24 and further movement of piston 22 to the right will result in an increase in the pressure of the fluid in chamber 24. Seal 62 is free to yield to any movement of piston 22 to the right and will eventually compress to conform in part to cavity 56. Due to the mass of material of seal 62 extending beyond face 68 of the piston toward head 18, at no time will face 68 contact surface 70 of plate 38. After seal 62 conforms in part to cavity 56 the remainder of seal 62 extending beyond face 68 will compress a slight amount between face 68 and surface 70.
  • a piston cylinder assembly having a housing with a body portion intermediate first and second heads, the body and heads defining together a cavity, a piston within the cavity in sliding engagement with the body portion, and a rod connected to the piston and extending out of the cavity'through the first'head, the rod and the first head defining therebetween an annular opening communicating the cavity with the exterior of the housing;
  • the rod defines a stepped down portion
  • annular resilient member encircles the rod and includes a. an annular foot extending radially inwardly toward the stepped down portion, and
  • an axially extending body member having an annular end face, intermediate the piston and the first head, which abuts the first head, and seals the annular opening upon movement of the resilient member toward the first head and entraps a quantity of fluid between the piston and the first head, thereby preventing contact between the piston and first head and causing the entrapped fluid to press radially against the resilient member toward the axis of the rod and thereby urge the foot of the resilient member toward the stepped down portion.
  • a piston cylinder assembly according to claim 1 wherein:
  • the piston defines a cup-shaped opening generally concentric with the annular resilient member and having a generally axially extending portion;
  • the stepped down portion of the rod is defined adjacent the closed end of the cup-shaped opening
  • the resilient member is generally located within the cup-shaped opening.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Actuator (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US00345825A 1973-03-28 1973-03-28 Seal for non-bottoming piston cylinder assembly Expired - Lifetime US3850080A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00345825A US3850080A (en) 1973-03-28 1973-03-28 Seal for non-bottoming piston cylinder assembly
GB1345974A GB1406023A (en) 1973-03-28 1974-03-26 Seal for non-bottoming piston cylinder assembly
DE2414787A DE2414787A1 (de) 1973-03-28 1974-03-27 Kolbenzylinderanordnung
JP3513274A JPS5647405B2 (https=) 1973-03-28 1974-03-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00345825A US3850080A (en) 1973-03-28 1973-03-28 Seal for non-bottoming piston cylinder assembly

Publications (1)

Publication Number Publication Date
US3850080A true US3850080A (en) 1974-11-26

Family

ID=23356649

Family Applications (1)

Application Number Title Priority Date Filing Date
US00345825A Expired - Lifetime US3850080A (en) 1973-03-28 1973-03-28 Seal for non-bottoming piston cylinder assembly

Country Status (4)

Country Link
US (1) US3850080A (https=)
JP (1) JPS5647405B2 (https=)
DE (1) DE2414787A1 (https=)
GB (1) GB1406023A (https=)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090288553A1 (en) * 2007-07-19 2009-11-26 Alexander Gaus Fluid power linear drive
WO2017121966A1 (fr) * 2016-01-15 2017-07-20 Valeo Embrayages Cylindre hydraulique emetteur a dispositif d'etancheite perfectionne
US9851005B2 (en) * 2014-05-06 2017-12-26 Lippert Components, Inc. Actuator with screw-in gland and detent structure
CN109441789A (zh) * 2018-11-30 2019-03-08 扬州四启环保设备有限公司 一种v形组合圈调压换向机构

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242946A (en) * 1978-08-02 1981-01-06 Humphrey Products Company Fluid pressure cylinder convertible for use with or without internal bumpers
DE3820078C3 (de) * 1987-06-16 1997-07-24 Hoerbiger Gmbh Doppeltwirkender Hydraulikzylinder
GB2281942B (en) * 1993-09-15 1997-08-13 Automotive Prod France Hydraulic actuators
RU2189505C1 (ru) * 2001-08-29 2002-09-20 Хмелевских Александр Иванович Подложка
EP3971251A4 (en) 2019-05-13 2022-12-07 Matsui Shikiso Chemical Co., Ltd. WHITE PIGMENT DISPERSION AND RELATED TECHNOLOGY

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2319608A (en) * 1941-11-07 1943-05-18 Southwestern Eng Co Fluid motor
US2556698A (en) * 1945-02-05 1951-06-12 G F Goodson Piston construction
US2642845A (en) * 1950-12-20 1953-06-23 Westinghouse Air Brake Co Piston cushioning apparatus
US3329068A (en) * 1966-04-15 1967-07-04 Signode Corp Pneumatic piston return system for impact tools

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2319608A (en) * 1941-11-07 1943-05-18 Southwestern Eng Co Fluid motor
US2556698A (en) * 1945-02-05 1951-06-12 G F Goodson Piston construction
US2642845A (en) * 1950-12-20 1953-06-23 Westinghouse Air Brake Co Piston cushioning apparatus
US3329068A (en) * 1966-04-15 1967-07-04 Signode Corp Pneumatic piston return system for impact tools

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090288553A1 (en) * 2007-07-19 2009-11-26 Alexander Gaus Fluid power linear drive
US8240243B2 (en) * 2007-07-19 2012-08-14 Festo Ag & Co. Kg Fluid power linear drive
CN101755132B (zh) * 2007-07-19 2013-05-22 费斯托股份有限两合公司 流体操纵的线性驱动装置
US9851005B2 (en) * 2014-05-06 2017-12-26 Lippert Components, Inc. Actuator with screw-in gland and detent structure
WO2017121966A1 (fr) * 2016-01-15 2017-07-20 Valeo Embrayages Cylindre hydraulique emetteur a dispositif d'etancheite perfectionne
FR3046820A1 (fr) * 2016-01-15 2017-07-21 Valeo Embrayages Cylindre hydraulique emetteur a dispositif d'etancheite perfectionne
CN109441789A (zh) * 2018-11-30 2019-03-08 扬州四启环保设备有限公司 一种v形组合圈调压换向机构

Also Published As

Publication number Publication date
JPS5025984A (https=) 1975-03-18
DE2414787A1 (de) 1974-10-10
JPS5647405B2 (https=) 1981-11-10
GB1406023A (en) 1975-09-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EATON CORPORATION;REEL/FRAME:004261/0903

Effective date: 19831231

AS Assignment

Owner name: CITICORP NORTH AMERICA, INC., AS AGENT

Free format text: SECURITY INTEREST;ASSIGNOR:YALE MATERIALS HANDLING CORPORATION;REEL/FRAME:005228/0113

Effective date: 19890526