US3362300A - Adjustable cam stop for rotary vane motors - Google Patents

Adjustable cam stop for rotary vane motors Download PDF

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Publication number
US3362300A
US3362300A US468710A US46871065A US3362300A US 3362300 A US3362300 A US 3362300A US 468710 A US468710 A US 468710A US 46871065 A US46871065 A US 46871065A US 3362300 A US3362300 A US 3362300A
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US
United States
Prior art keywords
vane
stop
cam
housing
shank
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
US468710A
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English (en)
Inventor
Homer J Shafer
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.)
HOMER J SHAFER AS GRANTOR AND VIRGINIA E SHAFER JON L SHAFER AND HARRY C KOHLER TRUSTEES 2500 PARK AVENUE WEST MANSFIELD OHIO 44906
VIRGINIA E SHAFER JON L SHAFER AND HARRY C KOHLER AS TRUSTEES OF HOMER J SHAFER TRUST ESTABLISHED UNDER TRUST AGREEMENT DATED JUNE 8 1981
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US468710A priority Critical patent/US3362300A/en
Priority to GB28055/66A priority patent/GB1078990A/en
Priority to NL6609115A priority patent/NL6609115A/xx
Priority to BE683558D priority patent/BE683558A/xx
Application granted granted Critical
Publication of US3362300A publication Critical patent/US3362300A/en
Anticipated expiration legal-status Critical
Assigned to VIRGINIA E. SHAFER, JON L. SHAFER AND HARRY C. KOHLER, AS TRUSTEES OF THE HOMER J. SHAFER TRUST ESTABLISHED UNDER TRUST AGREEMENT DATED JUNE 8, 1981, HOMER J. SHAFER, AS GRANTOR, AND VIRGINIA E. SHAFER, JON L. SHAFER AND HARRY C. KOHLER, TRUSTEES, 2500 PARK AVENUE WEST, MANSFIELD, OHIO 44906 reassignment VIRGINIA E. SHAFER, JON L. SHAFER AND HARRY C. KOHLER, AS TRUSTEES OF THE HOMER J. SHAFER TRUST ESTABLISHED UNDER TRUST AGREEMENT DATED JUNE 8, 1981 ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ESTATE OF HOMER J. SHAFER, DECEASED, VIRGINIA E. SHAFER, CO-EXECUTOR, JON L. SHAFER, CO-EXECUTOR
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
    • F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
    • 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
    • F15B15/12—Characterised by the construction of the motor unit of the oscillating-vane or curved-cylinder type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2102—Adjustable

Definitions

  • the motor In rotary vane hydraulic motors used as operators for large pipeline valves, the motor must be precisely aligned with the valve so that the rotary travel of the vanes terminates exactly at the fully closed and fully open positions of the valve, and adjustment of the stops for the vanes to accomplish this result should be made externally of the motor to save time and enable adjustments while the motor is filled with hydraulic fluid under high pressure.
  • adjustable stop is shown and described in US. Patent No. 3,171,332, issued Mar. 2, 1965, comprising a stop which slidably abuts a stationary shoe defining the internal pressure chamber of the motor, and which has a beveled edge for stopping rotation of the vane, with an adjustment stud screwed into the stop for sliding it radially of the shoe.
  • a major disadvantage of this prior stop is that when the vane strikes the stop the high pressure on the vane is transmitted to the stationary shoe and tends to loosen and displace it during repeated use. Also, the prior stop is relatively expensive to manufacture, and requires machining of the abutment surface on the shoe.
  • Another object is to provide improved stop construction which is adjustable externally of the motor while it is filled with high pressure fluid.
  • a further object is to provide improved stop means which transmits the pressure on the vane to the wall of the motor.
  • a still further object is to provide improved stop means which is inexpensive to manufacture and does not require machining of the internal shoe.
  • FIG. 1 is a plan section view, partly in elevation, of a rotary vane motor embodying the invention.
  • FIG. 2 is a vertical sectional view taken on line 22 of FIG. 1.
  • FIG. 3 is a fragmentary sectional view on line 3-3 of FIG. 1.
  • FIG. 4 is a perspective view of the adjustable cam stop detached from the assembly.
  • the rotary vane motor preferably includes a cylindrical casing having top and bottom cover plates 11 and 12, respectively, forming a closed cylindrical chamber, the plates being secured to the casing 10 by circumferential rows of screw studs 14.
  • the joints between the casing and the plates may be sealed by O-ring gaskets 15.
  • the rotor 16 comprises a hub 17 having its ends journaled in the end plates 11 and 12 by sleeve bearings 18 and 19, respectively, and the bearings each have O-rings 20 at the bearing surface to prevent leakage of hydraulic fluid from the motor and to keep out foreign matter.
  • Each sleeve bearing preferably has a pair of fluid and dust sealing O-rings 21 surrounding the bearing and located in annular grooves in the cover plates 11 and 12. Between each pair of rings 21 is .an annular groove 22 and 23, respectively.
  • the rotor hub 17 has an axial bore 24 extending there through with one or more keyways 25 for splined mounting on the stem of a rotary valve (not shown) which may be a plug valve or a ball valve.
  • a rotary valve (not shown) which may be a plug valve or a ball valve.
  • the manner of supporting the rotary vane motor on the rotary valve per se forms no part of the invention and is not shown.
  • the rotary vane motor has a pair of diametrically opposite stationary shoes 26A and 26B disposed within the motor chamber to bisect it into two chambers within which the vanes 27 of the rotor oscillate.
  • Each shoe preferably comprises a rectiliner block with at least one rectilinear O-ring 28 carried in a groove extending around the vertical perimeter of the block.
  • the shoes 26 have a close tolerance fit with the rotor and the inside wall of the casing 10, and the O-rings 28 provide effective seals preventing leakage of hydraulic fluid between the two chambers of the motor. As shown, the shoes may be secured to the top and bottom plates 11 and 12 by screw studs 30.
  • each vane 27A and 27B may be blocks welded to the rotor hub at diametrically opposite locations, or may be integrally formed with the rotor hub or attached thereto by other suitable means.
  • each vane preferably has at least one rectilinear O-ring 32 disposed substantially around its vertical perimeter in continuous fluid-tight engagement with the inner wall of the casing 10, and with the end plates 11 and 12 to prevent leakage of fluid past the vane as it oscillates in the motor chamber.
  • Suitable external pressure and exhaust connections 29 and 29A are provided for supplying hydraulic fluid to the motor and exhausting it therefrom.
  • crossover porting is preferably provided for balanced torque operation by directing pressure fluid to opposite sides of both vanes simultaneously.
  • the annular grooves 22 and 23 are connected by ports 31 to the chambers on opposite sides of the vanes.
  • FIG. 1 there are four adjustable cam stops indicated generally at 33, one at each end of each of the two motor chambers formed by the diametrically opposite shoes 26A and 26B. It will be understood that only two cam stops may be used, one on either side of one of the shoes 26A, for example, in which case vane 27A. abuts one of the stops at one end of the rotor travel, and vane 27B abuts the other of the stops at the other end of the rotor travel. The use of four stops is preferred to provide balanced torque on the rotor when it is stopped at either end of the rotor travel corresponding to the fully open and fully closed positions of the valve.
  • the improved cam stops 33 each preferably comprise a shank 34 extending through a close fitting bore 35 in the cylinder wall, and having an integral cam 36 on its inner end and a threaded portion 37 at its outer end, with a squared wrench-engaging portion 38.
  • the shank has an O-ring groove 39 for receiving an O-ring 40 to make a seal between the shank '34 and the bore 35.
  • Adjacent to the cam 36 is an annular shoulder 41 which is adapted to seat against an internal spot face 42 which is a planar annular'surface surrounding the bore on the inner surface of the casing 10.
  • a tapered locking bushing 43 is seated in a tapered socket at the outer end of bore 35 for abutting a lock nut 44 screwed on the threaded portion 37 of the shank aseasns to lock the shank against turning in the bore after it has been adjusted.
  • the cam 36 has a substantially spiral peripheryterminating at an outer point, so that rotation of the cam presents a cam edge of varying radius to afford an adjustable stop for the vane at the end of its travel in one direction.
  • the cams are designed to provide a total angular adjustment of the rotor of about two and one-half degrees.
  • the adjustment is easily made externally of the fluid motor after it is assembled and filled With fluid under pressure. All that is necessary is to loosen the lock nut 4-4 and then rotate the shank 34 by applying a Wrench t the squared end 33. ⁇ Vhen the adjusted position has been located, the lock nut 44 is tightened to maintain the cam stop in position.
  • a rotary vane fluid motor having a closed cylindrical housing, a rotor hub having a vane oscillatable in said housing, and means defining a pressure chamber Within which the vane oscillates
  • the improvement comprising an adjustable cam stop for abutting the vane to limit its motion, said cam stop having a shank extending through said housing for transmitting the pressure from the vane to said housing, said cam stop having an internal shoulder with a planar surface, a planar spot face on the inner surface of said housing abutting the planar surface of said shoulder, an integral cam on the inner end of said'shank having a spiral peripheral surface for surface abutment With the vane in various positions of adjustment, and means on the outer end of said shank for locking said stop with said cam in a position of rotary adjustment.
  • said locking means comprises a tapered lock bushing in said housing engaging said shank, and a nut screwed on the outer end of said shank in abutment with said bushing for clamping said shoulder in abutment with said spot face and for locking said cam stop With said cam in a position of rotary adjustment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Hydraulic Motors (AREA)
  • Rotary Pumps (AREA)
US468710A 1965-07-01 1965-07-01 Adjustable cam stop for rotary vane motors Expired - Lifetime US3362300A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US468710A US3362300A (en) 1965-07-01 1965-07-01 Adjustable cam stop for rotary vane motors
GB28055/66A GB1078990A (en) 1965-07-01 1966-06-23 Oscillating vane hydraulic actuators
NL6609115A NL6609115A (id) 1965-07-01 1966-06-30
BE683558D BE683558A (id) 1965-07-01 1966-07-01

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US468710A US3362300A (en) 1965-07-01 1965-07-01 Adjustable cam stop for rotary vane motors

Publications (1)

Publication Number Publication Date
US3362300A true US3362300A (en) 1968-01-09

Family

ID=23860924

Family Applications (1)

Application Number Title Priority Date Filing Date
US468710A Expired - Lifetime US3362300A (en) 1965-07-01 1965-07-01 Adjustable cam stop for rotary vane motors

Country Status (4)

Country Link
US (1) US3362300A (id)
BE (1) BE683558A (id)
GB (1) GB1078990A (id)
NL (1) NL6609115A (id)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060000435A1 (en) * 2004-07-02 2006-01-05 Ina-Schaeffler Kg Camshaft adjuster
US20090205486A1 (en) * 2006-03-31 2009-08-20 Christian Ante Fluid Operated Rotary Drive

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1870296A (en) * 1930-10-02 1932-08-09 Wagner Electric Corp Brake mechanism
US1880375A (en) * 1931-03-14 1932-10-04 Delco Remy Corp Clamping device
US3171332A (en) * 1963-06-04 1965-03-02 Shafer Valve Co Adjustable stop for rotary vane motors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1870296A (en) * 1930-10-02 1932-08-09 Wagner Electric Corp Brake mechanism
US1880375A (en) * 1931-03-14 1932-10-04 Delco Remy Corp Clamping device
US3171332A (en) * 1963-06-04 1965-03-02 Shafer Valve Co Adjustable stop for rotary vane motors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060000435A1 (en) * 2004-07-02 2006-01-05 Ina-Schaeffler Kg Camshaft adjuster
US20090205486A1 (en) * 2006-03-31 2009-08-20 Christian Ante Fluid Operated Rotary Drive
US7739944B2 (en) * 2006-03-31 2010-06-22 Festo Ag & Co. Kg Fluid operated rotary drive
CN101415954B (zh) * 2006-03-31 2012-11-28 费斯托股份有限两合公司 流体控制的旋转驱动装置

Also Published As

Publication number Publication date
GB1078990A (en) 1967-08-09
BE683558A (id) 1966-12-16
NL6609115A (id) 1967-01-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VIRGINIA E. SHAFER, JON L. SHAFER AND HARRY C. KOH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ESTATE OF HOMER J. SHAFER, DECEASED, VIRGINIA E. SHAFER,CO-EXECUTOR, JON L. SHAFER, CO-EXECUTOR;REEL/FRAME:004739/0852

Effective date: 19841214

Owner name: HOMER J. SHAFER, AS GRANTOR, AND VIRGINIA E. SHAFE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ESTATE OF HOMER J. SHAFER, DECEASED, VIRGINIA E. SHAFER,CO-EXECUTOR, JON L. SHAFER, CO-EXECUTOR;REEL/FRAME:004739/0852

Effective date: 19841214