US3311026A - Bypass valve for hydraulic jacks - Google Patents

Bypass valve for hydraulic jacks Download PDF

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Publication number
US3311026A
US3311026A US516619A US51661965A US3311026A US 3311026 A US3311026 A US 3311026A US 516619 A US516619 A US 516619A US 51661965 A US51661965 A US 51661965A US 3311026 A US3311026 A US 3311026A
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US
United States
Prior art keywords
piston
valves
pressure
jack
stroke
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
US516619A
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English (en)
Inventor
Chester A Crisp
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to US516619A priority Critical patent/US3311026A/en
Priority to GB52649/66A priority patent/GB1126725A/en
Priority to SE17450/66A priority patent/SE304921B/xx
Priority to FR88763A priority patent/FR1506058A/fr
Priority to DEC41099A priority patent/DE1279908B/de
Priority to BE691819D priority patent/BE691819A/xx
Application granted granted Critical
Publication of US3311026A publication Critical patent/US3311026A/en
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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/225—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke with valve stems operated by contact with the piston end face or with the cylinder wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D49/00—Tractors
    • B62D49/04—Tractors modified to take pushing devices
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically

Definitions

  • This invention relates to hydraulic jacks and particularly to improvements in the bypass valves employed in some jacks to relieve the shock when the piston reaches the end of its travel and abuts the end of the cylinder.
  • valves described above often relieve or bypass too much fluid too quickly so that the piston travels on by pressure and inertia to the end of its stroke where shock is produced which is damaging to the jack and its supporting structure.
  • FIG. 1 is a view in side elevation of the front portion of a track-type tractor with a bulldozer secured thereto and illustrating a conventional jack for raising and lowering the bulldozer blade with respect to the ground;
  • FIG. 2 is an enlarged fragmentary sectional view of the jack shown in FIG. 1 illustrating valves embodying the present invention controlling flow of fluid through the jack piston;
  • FIG. 3 is a fragmentary detail showing a constructional feature of one of the valves shown in FIG. 2;
  • FIG. 4 is a sectional view taken on the line IV-IV of FIG. 3.
  • FIG. 1 the forward end of a tractor indicated generally at is shown as supporting a bulldozer blade 11 by means of push arms 12 which may be raised and lowered about their pivotal connections 13 with truck frames 14 of the tractor, there being only one push arm and connection shown in FIG. 1.
  • a tilt brace is only partially shown at 15 and a hydraulic jack 16 is provided for raising and lowering the blade.
  • the jack is pivotally supported on a trunnion 17 shown in dotted lines and supported on a bracket 18 which is secured to the radiator guard 19 of the tractor.
  • the jack has the usual piston and extensible rod 20 pivoted to the blade 11 as at 21.
  • the jack is of the double acting type and fluid from a suitable source under pressure, which is not shown, may be introduced to either end of the jack for raising and lowering the blade.
  • a jack of this type When a jack of this type is fully extended or fully retracted under the high pressures required for operating devices of this type, an undesirable shock is often encountered as the piston reach-es the end of the stroke and damage results not only to the jack but to associated parts of the tractor itself. It has been common practice to provide ports extending through the piston from the rod end to the head end of the cylinder and to control flow through these ports with double acting check valves of the kind shown in FIGS. 2, 3 and 4.
  • the jack piston is shown at 23 as fitted over a reduced end of the rod 20 and secured thereon as by a nut 24.
  • the piston is generally of solid material With suitable seals such as shown at 25 and 26 and has ports extending therethrough for reception of check valves 27 and 28 which have stems 29 and 30, respectively, guided in sleeves 31 pressed into opposite ends of the port.
  • the sleeves are retained in position by washers 33 and 34 encircling the reduced portion of the shaft 20 and overlying the edges of the sleeves.
  • the sleeves are generally hollow and have cutaway portions, best shown in FIGS. 3 and 4 at 35, communicating with their interiors to permit flow of fluid from one side of the piston to the other.
  • valve stems 29 and 30 engage the end of the cylinder being approached and the valves, having been held closed by the pressure which causes the stroke, are opened to bleed pressure to the opposite sides of the piston.
  • the valves are normally urged to the closed position such as illustrated for the valve 28 and as the end of the stroke is approached, the valves are opened to the position shown in connection with the valve 27 to permit bleeding of pressure from the rod side to the head side and this pressure is exhausted as through a passage 36 and conduit 37 through which it is returned to the sump (not shown).
  • the improvement of the present invention resides in providing one of the valves, this being the valve 27 in FIG. 2, with a stem which is considerably longer in both directions than the stem of the other valve. Consequently as the piston approaches the end of the stroke, this stem is engaged first and the one valve opened first bleeding a small quantity of fluid thus reducing speed prior to opening of the second valve. Consequently the inertial force has been reduced and contact between piston and the end of the cylinder is prevented.
  • the present disclosure shows the piston as having two ports and two valves but obviously any number of valved ports may be employed and any desired number of the valves mayhave longer stems for producing the modulating effect which is produced by opening of one or more valves prior to opening of the others.
  • Nellan 91401 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
US516619A 1965-12-27 1965-12-27 Bypass valve for hydraulic jacks Expired - Lifetime US3311026A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US516619A US3311026A (en) 1965-12-27 1965-12-27 Bypass valve for hydraulic jacks
GB52649/66A GB1126725A (en) 1965-12-27 1966-11-24 Hydraulic jack and piston valve member therefor
SE17450/66A SE304921B (xx) 1965-12-27 1966-12-20
FR88763A FR1506058A (fr) 1965-12-27 1966-12-23 Perfectionnements aux soupapes de dérivation pour vérins hydrauliques
DEC41099A DE1279908B (de) 1965-12-27 1966-12-23 Doppeltwirkender hydraulischer Hubzylinder mit beidseitig aus dem Kolben hervorstehenden Ventilspindeln
BE691819D BE691819A (xx) 1965-12-27 1966-12-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US516619A US3311026A (en) 1965-12-27 1965-12-27 Bypass valve for hydraulic jacks

Publications (1)

Publication Number Publication Date
US3311026A true US3311026A (en) 1967-03-28

Family

ID=24056386

Family Applications (1)

Application Number Title Priority Date Filing Date
US516619A Expired - Lifetime US3311026A (en) 1965-12-27 1965-12-27 Bypass valve for hydraulic jacks

Country Status (6)

Country Link
US (1) US3311026A (xx)
BE (1) BE691819A (xx)
DE (1) DE1279908B (xx)
FR (1) FR1506058A (xx)
GB (1) GB1126725A (xx)
SE (1) SE304921B (xx)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515224A (en) * 1967-10-05 1970-06-02 Case Co J I Hydraulic cylinder control for bulldozer
US3872774A (en) * 1970-11-14 1975-03-25 Daimler Benz Ag Disconnecting valve mechanism for a servo-steering system of vehicles
JPS51101001U (xx) * 1975-02-12 1976-08-13
US3991832A (en) * 1975-07-14 1976-11-16 Deere & Company Hydraulically tiltable and anglable dozer blade and mounting therefor
JPS52917A (en) * 1975-06-19 1977-01-06 Emhart Uk Ltd Glassware molding apparatus
JPS5234393U (xx) * 1975-08-30 1977-03-10
US4031967A (en) * 1976-06-14 1977-06-28 Caterpillar Tractor Co. Motor grader with spherical bearing mounting for blade tilt cylinders
US4060136A (en) * 1976-06-14 1977-11-29 Caterpillar Tractor Co. Motor grader blade mounting and tilt mechanism
US4243106A (en) * 1978-01-13 1981-01-06 Massey-Ferguson Services N.V. Device for setting blade of earthmover
JPS5673204A (en) * 1979-11-14 1981-06-17 Takara Isu Kogyo Kk Hydraulic driving apparatus
US4509409A (en) * 1983-02-07 1985-04-09 Towmotor Corporation Pump arrangement for a linear fluid operated device
DE3417447A1 (de) * 1984-05-11 1985-11-21 E.P.E. Budde GmbH, 5980 Werdohl Vorrichtung zur erfassung der endlagen eines hydraulikzylinders
US4825752A (en) * 1987-12-14 1989-05-02 Commercial Shearing, Inc. End-of-stroke bypass valve in piston for impact relief in hydraulic tilt and trim cylinder
US4860646A (en) * 1987-02-10 1989-08-29 Marathon Corporation Compactor with hydraulic dwell and method
CN104781563A (zh) * 2014-09-26 2015-07-15 株式会社小松制作所 具备缓冲功能的液压缸
CN107806457A (zh) * 2016-09-08 2018-03-16 湖北江山液压科技有限公司 一种泄压缓冲液压缸

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2547290B1 (fr) * 1983-06-07 1987-04-30 Rassant Sa Ets F Cric hydraulique a limiteur de course perfectionne
EP0182927B1 (fr) * 1984-11-26 1988-09-21 ETABLISSEMENTS F. Rassant S.A. Cric hydraulique à limiteur de course perfectionné
DE202013001260U1 (de) 2013-02-12 2014-05-14 Bümach Engineering International B.V. Arbeitszylinder mit Druckmediumüberströmung
WO2023147797A1 (de) 2022-02-04 2023-08-10 Bümach Engineering International B. V. Arbeitszylinder mit druckmediumüberströmung
DE202022000299U1 (de) 2022-02-04 2023-06-09 Bümach Enginneering International B.V. Arbeitszylinder mit Druckmediumüberströmung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US841527A (en) * 1904-10-11 1907-01-15 Joseph H Hoover Piston.
US1985361A (en) * 1931-06-01 1934-12-25 Anthony Co Hoist control
US2752890A (en) * 1955-01-27 1956-07-03 Power Brake Parts Mfg Co Pneumatic actuator with automatic pressure unloading device
US2902007A (en) * 1957-05-31 1959-09-01 Allis Chalmers Mfg Co Cylinder piston assembly with pressure relieving means
US3182563A (en) * 1963-08-19 1965-05-11 Thompson Ramo Wooldridge Inc Hydraulic cylinder piston

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB640414A (en) * 1948-03-06 1950-07-19 Mavor & Coulson Ltd Improvements in props
FR1062300A (fr) * 1952-08-29 1954-04-21 Vérin

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US841527A (en) * 1904-10-11 1907-01-15 Joseph H Hoover Piston.
US1985361A (en) * 1931-06-01 1934-12-25 Anthony Co Hoist control
US2752890A (en) * 1955-01-27 1956-07-03 Power Brake Parts Mfg Co Pneumatic actuator with automatic pressure unloading device
US2902007A (en) * 1957-05-31 1959-09-01 Allis Chalmers Mfg Co Cylinder piston assembly with pressure relieving means
US3182563A (en) * 1963-08-19 1965-05-11 Thompson Ramo Wooldridge Inc Hydraulic cylinder piston

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515224A (en) * 1967-10-05 1970-06-02 Case Co J I Hydraulic cylinder control for bulldozer
US3872774A (en) * 1970-11-14 1975-03-25 Daimler Benz Ag Disconnecting valve mechanism for a servo-steering system of vehicles
JPS51101001U (xx) * 1975-02-12 1976-08-13
JPS5733202Y2 (xx) * 1975-02-12 1982-07-22
JPS5515417B2 (xx) * 1975-06-19 1980-04-23
JPS52917A (en) * 1975-06-19 1977-01-06 Emhart Uk Ltd Glassware molding apparatus
US3991832A (en) * 1975-07-14 1976-11-16 Deere & Company Hydraulically tiltable and anglable dozer blade and mounting therefor
JPS5234393U (xx) * 1975-08-30 1977-03-10
US4060136A (en) * 1976-06-14 1977-11-29 Caterpillar Tractor Co. Motor grader blade mounting and tilt mechanism
US4031967A (en) * 1976-06-14 1977-06-28 Caterpillar Tractor Co. Motor grader with spherical bearing mounting for blade tilt cylinders
US4243106A (en) * 1978-01-13 1981-01-06 Massey-Ferguson Services N.V. Device for setting blade of earthmover
JPS5673204A (en) * 1979-11-14 1981-06-17 Takara Isu Kogyo Kk Hydraulic driving apparatus
US4509409A (en) * 1983-02-07 1985-04-09 Towmotor Corporation Pump arrangement for a linear fluid operated device
DE3417447A1 (de) * 1984-05-11 1985-11-21 E.P.E. Budde GmbH, 5980 Werdohl Vorrichtung zur erfassung der endlagen eines hydraulikzylinders
US4860646A (en) * 1987-02-10 1989-08-29 Marathon Corporation Compactor with hydraulic dwell and method
US4825752A (en) * 1987-12-14 1989-05-02 Commercial Shearing, Inc. End-of-stroke bypass valve in piston for impact relief in hydraulic tilt and trim cylinder
CN104781563A (zh) * 2014-09-26 2015-07-15 株式会社小松制作所 具备缓冲功能的液压缸
US9309946B1 (en) 2014-09-26 2016-04-12 Komatsu Ltd. Cylinder with shock absorbing function
CN107806457A (zh) * 2016-09-08 2018-03-16 湖北江山液压科技有限公司 一种泄压缓冲液压缸

Also Published As

Publication number Publication date
FR1506058A (fr) 1967-12-15
GB1126725A (en) 1968-09-11
DE1279908B (de) 1968-10-10
SE304921B (xx) 1968-10-07
BE691819A (xx) 1967-06-27

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