CA1062975A - Piston operator for imparting rotary motion - Google Patents
Piston operator for imparting rotary motionInfo
- Publication number
- CA1062975A CA1062975A CA259,323A CA259323A CA1062975A CA 1062975 A CA1062975 A CA 1062975A CA 259323 A CA259323 A CA 259323A CA 1062975 A CA1062975 A CA 1062975A
- Authority
- CA
- Canada
- Prior art keywords
- cylinder
- slot
- piston
- valve stem
- rotary valve
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 4
- 241001052209 Cylinder Species 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 2
- VREFGVBLTWBCJP-UHFFFAOYSA-N alprazolam Chemical compound C12=CC(Cl)=CC=C2N2C(C)=NN=C2CN=C1C1=CC=CC=C1 VREFGVBLTWBCJP-UHFFFAOYSA-N 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000013641 positive control Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
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
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/066—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the scotch yoke type
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
- F16K31/163—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston
- F16K31/1635—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston for rotating valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
- Mechanically-Actuated Valves (AREA)
- Hydraulic Motors (AREA)
Abstract
Abstract A linear piston operator having a cylinder enclosing at least one piston, a connector bar connected to said piston and an oscillatable element operatively connecting the connector bar to a rotary shaft extending transversely and tangentially of the cylinder. The oscillatable element extends through a longitudinal slot in the cylinder wall, and the shaft end of the element is enclosed in a housing having two longitudinal reinforcing portions extending along and welded to the sides of the slot, said shaft being journaled in said reinforcing portions.
Description
L06Z~75 ackgroun~ of the Invention My Canadian Patent No. 940,395, issued January 22, 1974 shows a linear piston operator having tw~ axially aligned pistons connected ky a bar -mounting two spaced rollers for selectively engaging opposite sides o a crank arm having a collar keyed to a valve st~m extending txansversely through a circul æ notch in the piston housing, and a transverse tubular housing for the valve stem and collar cut out to conform to and enclose the notch and welded to the e ges thereof. That construction provided a sealed enclosure for storing high press~re fluid in the cavity within the piston housing between the two pistons.
A disadvantage of that construction is that in an intermediate position of the valve stem ket~een fully open and fully closed valve posi-tions, control of the valve stem is not positive as some floating or drift-ing of the valve can occur kecause of the space ketween the crank arm and one of the rollers of the piston oonnector bar. A scotch-yoke connector having a constan sliding engagement with a single roller on the piston connector ~ar produoe s positive control of the valve in all positions, but the slot in ~-the yoke requires substantial mass on koth sides of the slot and conseguent increased overall width to provide the necessary s~rength to absorb piston P~
thrust. Consequently, a m~ch larger notch in the piston housing is required to acoommDdate the increased width of the scotch-yoke as it oscillates between valve cp~n and closed positions, and such notch substantially weakens the resistance of the cylinder wall to high internal pressures when high pressure fluid is stored in the cavity ketween the two pisto~s.
Sumc~ry of the Invention The present invention provides a linear piston operator for a rotary valve having a single cylinder, a piston in the cylinder, a connectcr bar oonnected to the piston, and a rotary valve stem member extending trans-ver æ ly and substantially tangentially of the cylinder. The cyIinder has a longitudinal slot adjacent the valve stem, an oscillatable element operatively connecting the connector kar to the valve stem memker and extending through the slot during oscillation, and a housing partially .
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surrounding the stem nE~ber cm d bridging over the slot c~nd having its ends welded to the cylinder at the ends of the slot. The housing has tWD
longitudinal side bar portions w7elded to the cylin~Pr along the sides of the slot, the side bar portions extending laterally from their weldments a substantial distanoe into the cylinder to increase reinforcement thereof.
Preferably, the cylinder has two axially c~ligned spaced-ap~rt pistons therein, and the connector bar connects the tWD pistons.
The valve stem nEmker may be journaled in the two longitudinal side bars.
1~ The housing may form a sealed enclosure for a pressure fluid ~ ~
storage cavit~ between the t~ pistons. -The oscillatable element may be a crank arm secured to the valve stem me~ber and pivotally connected at its outer end to the aonnector bar.
The housing may form a sealed enclosure at one side of the piston, and the ends of the cylinder may have ports for introducing and exhausting pressure fluid.
Preferred embodIments of the invention are shown ky way of example in the accc~panying drawings and described in the foll~wing speci-fication. Various mDdifications and changes in details of construction are co~prehended within the scope of the appended claims.
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A disadvantage of that construction is that in an intermediate position of the valve stem ket~een fully open and fully closed valve posi-tions, control of the valve stem is not positive as some floating or drift-ing of the valve can occur kecause of the space ketween the crank arm and one of the rollers of the piston oonnector bar. A scotch-yoke connector having a constan sliding engagement with a single roller on the piston connector ~ar produoe s positive control of the valve in all positions, but the slot in ~-the yoke requires substantial mass on koth sides of the slot and conseguent increased overall width to provide the necessary s~rength to absorb piston P~
thrust. Consequently, a m~ch larger notch in the piston housing is required to acoommDdate the increased width of the scotch-yoke as it oscillates between valve cp~n and closed positions, and such notch substantially weakens the resistance of the cylinder wall to high internal pressures when high pressure fluid is stored in the cavity ketween the two pisto~s.
Sumc~ry of the Invention The present invention provides a linear piston operator for a rotary valve having a single cylinder, a piston in the cylinder, a connectcr bar oonnected to the piston, and a rotary valve stem member extending trans-ver æ ly and substantially tangentially of the cylinder. The cyIinder has a longitudinal slot adjacent the valve stem, an oscillatable element operatively connecting the connector kar to the valve stem memker and extending through the slot during oscillation, and a housing partially .
: . . . . .
` ~06Z975 ~ ;
surrounding the stem nE~ber cm d bridging over the slot c~nd having its ends welded to the cylinder at the ends of the slot. The housing has tWD
longitudinal side bar portions w7elded to the cylin~Pr along the sides of the slot, the side bar portions extending laterally from their weldments a substantial distanoe into the cylinder to increase reinforcement thereof.
Preferably, the cylinder has two axially c~ligned spaced-ap~rt pistons therein, and the connector bar connects the tWD pistons.
The valve stem nEmker may be journaled in the two longitudinal side bars.
1~ The housing may form a sealed enclosure for a pressure fluid ~ ~
storage cavit~ between the t~ pistons. -The oscillatable element may be a crank arm secured to the valve stem me~ber and pivotally connected at its outer end to the aonnector bar.
The housing may form a sealed enclosure at one side of the piston, and the ends of the cylinder may have ports for introducing and exhausting pressure fluid.
Preferred embodIments of the invention are shown ky way of example in the accc~panying drawings and described in the foll~wing speci-fication. Various mDdifications and changes in details of construction are co~prehended within the scope of the appended claims.
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- 2 -Description of the Drawings Fig. 1 is a longitudinal sectional view, partly in elevation of one embodiment of the improved piston operator, showing the scotch-yoke at one end of its stroke.
Fig. 2 is an end elevational view thereof.
Fig. 3 is a cross-sectional view on line 3-3 of Fig.
1, showing the scotch-yoke at the middle of its stroke.
Fig. 4 is a partial side elevation on line 4-4 of Fig. 2.
Fig. 5 is a longitudinal sectional view, partly in elevation, of another embodiment of the improved piston operator , .. . .
having a single piston within the cylinder, and a connector bar and crank arm connecting the piston to the valve stem element enclosed within the improved housing. ~ `
Fig. 6 is a side elevation with parts broken away.
Fig. 7 is a cross-sectional view on line 7-7 of Fig. 6 showing the crank arm at the middle of its stroke.
Description of One Preferred Embodiment The cylinder indicated generally at 10 may be formed 20 of standard steel tubing and has end caps 11 which are held to- ~-gether tightly closing the ends of the cylinder by tie bolts 12 extending through diametrically opposite ears I3 on the end ~ ;
caps.
Within the cylinder 10 are two axially aligned pistons 14 connected in spaced relation by a bar 15 by means of bolts 16 extending through the pistons and screwed into the ends 15' ~
of the connector bar 15. The heads of the bolts 16 are prefer- -ably recessed within the outer faces of the pistons, and are adapted to abut the inner ends of adjusting screws 17 extend-ing through the end caps ll for the purpose of varying the stroke of the pistons. As shown, the adjusting screws 17 preferably have sealing caps 18 which embody O-rings l9 and 20 encircling the screws.
:
Fig. 2 is an end elevational view thereof.
Fig. 3 is a cross-sectional view on line 3-3 of Fig.
1, showing the scotch-yoke at the middle of its stroke.
Fig. 4 is a partial side elevation on line 4-4 of Fig. 2.
Fig. 5 is a longitudinal sectional view, partly in elevation, of another embodiment of the improved piston operator , .. . .
having a single piston within the cylinder, and a connector bar and crank arm connecting the piston to the valve stem element enclosed within the improved housing. ~ `
Fig. 6 is a side elevation with parts broken away.
Fig. 7 is a cross-sectional view on line 7-7 of Fig. 6 showing the crank arm at the middle of its stroke.
Description of One Preferred Embodiment The cylinder indicated generally at 10 may be formed 20 of standard steel tubing and has end caps 11 which are held to- ~-gether tightly closing the ends of the cylinder by tie bolts 12 extending through diametrically opposite ears I3 on the end ~ ;
caps.
Within the cylinder 10 are two axially aligned pistons 14 connected in spaced relation by a bar 15 by means of bolts 16 extending through the pistons and screwed into the ends 15' ~
of the connector bar 15. The heads of the bolts 16 are prefer- -ably recessed within the outer faces of the pistons, and are adapted to abut the inner ends of adjusting screws 17 extend-ing through the end caps ll for the purpose of varying the stroke of the pistons. As shown, the adjusting screws 17 preferably have sealing caps 18 which embody O-rings l9 and 20 encircling the screws.
:
3. `
The connector bar 15 may be circular in cross section -~
having a diameter substantially less than the inner diameter ~-of the cylinder, and is provided with a longitudinal slot 22 extending between the ends 15' and laterally through the bar.
Midway of the ends of the slot 22 a roller mounting pin 24 extends across the slot with its ends secured in opposite sides of the bax 15, and a tubular roller 25 is journaled on pin 24 within the slot.
A longitudinal slot 26 is cut in the wall of the cyl-10 inder 10 midway of its ends and laterally opposite to the slot ~ ~ ;
22, and the valve stem 28 of a rotary valve (not shown) extends through the slot transversely of the cylinder and substantially tangentially thereto. A scotch-yoke 29 extends through slot 26 and operatively connects the valve stem 28 to the roller 25 traversing the slot 22 in the bar 15.
As shown, the scotch-yoke 29 has an end portion encir-cling valve stem 28 and secured thereon by a key 30. The other -~
end of the scotch-yoke has an open slot 31 therein in which the roller 25 is movably engaged. The ends 15' of slot 22 are `
spaced apart sufficiently to provide clearance for the scotch-yoke at the ends of its stroke.
The housing which encloses the slot and surrounds the valve stem and scotch-yoke also provides a sealed enclosure for the cavity in the cylinder between the pistons 14 so that it can ~-be used to store high pressure fluid. As shown, this housing may comprise a curved substantially semi-cylindrical section 32 having its axis of curvature transverse to the axis of curvature of cylinder 10 bridging over and having its ends welded at 33 to the ends of the slot 26, and said section being sandwiched 30 between two bars 34 extending along the sides of the slot and -welded at 35 to the cylinder, and at 36 to the edges of sec-tion 32.
The connector bar 15 may be circular in cross section -~
having a diameter substantially less than the inner diameter ~-of the cylinder, and is provided with a longitudinal slot 22 extending between the ends 15' and laterally through the bar.
Midway of the ends of the slot 22 a roller mounting pin 24 extends across the slot with its ends secured in opposite sides of the bax 15, and a tubular roller 25 is journaled on pin 24 within the slot.
A longitudinal slot 26 is cut in the wall of the cyl-10 inder 10 midway of its ends and laterally opposite to the slot ~ ~ ;
22, and the valve stem 28 of a rotary valve (not shown) extends through the slot transversely of the cylinder and substantially tangentially thereto. A scotch-yoke 29 extends through slot 26 and operatively connects the valve stem 28 to the roller 25 traversing the slot 22 in the bar 15.
As shown, the scotch-yoke 29 has an end portion encir-cling valve stem 28 and secured thereon by a key 30. The other -~
end of the scotch-yoke has an open slot 31 therein in which the roller 25 is movably engaged. The ends 15' of slot 22 are `
spaced apart sufficiently to provide clearance for the scotch-yoke at the ends of its stroke.
The housing which encloses the slot and surrounds the valve stem and scotch-yoke also provides a sealed enclosure for the cavity in the cylinder between the pistons 14 so that it can ~-be used to store high pressure fluid. As shown, this housing may comprise a curved substantially semi-cylindrical section 32 having its axis of curvature transverse to the axis of curvature of cylinder 10 bridging over and having its ends welded at 33 to the ends of the slot 26, and said section being sandwiched 30 between two bars 34 extending along the sides of the slot and -welded at 35 to the cylinder, and at 36 to the edges of sec-tion 32.
4.
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10~i2975 Since extremely high pressure fluid may be stored in the cylinder between the pistons, it is necessary that the sides of the slot 26 be reinforced against spreading, and accordingly the bars 34 are required to have substantial mass and weight.
For the same reason, it is desirable to provide stitch welds 37 on the interior of the ends of the curved section 32 to prevent ~ , them from bowing radially and weakening the exterior weldments 33.
Obviously, the housing surrounding the valve stem ~ ;
could be formed in a different manner, for example, by machining an arcuate cavity in one face of a block of steel, but the side and end portions of the block would be required to have suffi-cient mass to reinforce the sides of the slot against spreading due to high internal pressures.
As shown in Fig. 3, the valve stem 28 is journaled in the reinforcing bars 34 of the housing by means of bearing ,~
bushings 38 held in place by plates 39 abutting the outer faces of the bars 34 and secured thereto by cap screws 40. O-ring seals are provided around the stem. The substantial mass of the bars 34 provides strong and stable bearing supports for the valve stem.
In the operation of the improved piston operator of Figs. 1 - 4, assuming that the scotch~yoke is in the full line position of Fig. 1, pressure fluid is introduced through a port 42 in the right hand end cap 11 and exhausted through a duplicate port 42 in the other end cap. This causes the pistons 14 to move to the left and the roller 25 and scotch-yoke 29 to rotate the valve stem 28 counterclockwise as viewed in Fig. 1. If it is desired to hold the valve stem in a position intermediate the open and closed position of the valve, shutting off the fluid pressure to the cylinder positively holds the valve stem in the desired position because the engagement of the roller 25 in the slot 31 prevents floating of the valve.
,., . .:
10~i2975 Since extremely high pressure fluid may be stored in the cylinder between the pistons, it is necessary that the sides of the slot 26 be reinforced against spreading, and accordingly the bars 34 are required to have substantial mass and weight.
For the same reason, it is desirable to provide stitch welds 37 on the interior of the ends of the curved section 32 to prevent ~ , them from bowing radially and weakening the exterior weldments 33.
Obviously, the housing surrounding the valve stem ~ ;
could be formed in a different manner, for example, by machining an arcuate cavity in one face of a block of steel, but the side and end portions of the block would be required to have suffi-cient mass to reinforce the sides of the slot against spreading due to high internal pressures.
As shown in Fig. 3, the valve stem 28 is journaled in the reinforcing bars 34 of the housing by means of bearing ,~
bushings 38 held in place by plates 39 abutting the outer faces of the bars 34 and secured thereto by cap screws 40. O-ring seals are provided around the stem. The substantial mass of the bars 34 provides strong and stable bearing supports for the valve stem.
In the operation of the improved piston operator of Figs. 1 - 4, assuming that the scotch~yoke is in the full line position of Fig. 1, pressure fluid is introduced through a port 42 in the right hand end cap 11 and exhausted through a duplicate port 42 in the other end cap. This causes the pistons 14 to move to the left and the roller 25 and scotch-yoke 29 to rotate the valve stem 28 counterclockwise as viewed in Fig. 1. If it is desired to hold the valve stem in a position intermediate the open and closed position of the valve, shutting off the fluid pressure to the cylinder positively holds the valve stem in the desired position because the engagement of the roller 25 in the slot 31 prevents floating of the valve.
5.
6;2975 The cavity in the cylinder 10 between pistons 14 may be utilized for storing a supply of pressure fluid because the housing comprising the arcuate section 32 and the bars 34 pro- -vides a sealed enclosure over the slot 26. Preferably, angular ports 44 are provided in one of the bars 34 for communicating with the pressure fluid in this cavity. Because of the rein-forcement around the slot 26 by the housing enclosing it, fluid at extremely high pressure may be stored. One use for such stored pressure fluid is in case the pressure supply to operate the pistons fails, in which case the stored pressure may be con-nected to one o~ the ports 42 to rotate the valve stem 28 and operate the valve. , -Description of a Second Preferred Embodiment .. . :. . .
The cylinder indicated generally at 110 may be con- ~ -structed the same as cylinder 10 of standard steel tubing with end caps 111 held together by tie bolts 112. Reciprocable within ~;
cylinder 110 is a single piston 114 having a transverse wrist pin 145 therein pivotally connected to one end of a connector bar 146. The other end of bar 146 is a clevis 147 pivotally connected by pin 148 to one end of an oscillatable crank arm 149 having its other end welded to a collar 150 encircling the valve stem member 128 and non-rotatively secured thereto by keys 130.
Preferably, the end caps 111 have adjusting screws 117 therein for abutting the end of the crank arm ~ at one end of the cylinder and the face of piston 114 at the other end of the ~ ;
cylinder, so that the stroke of the piston may be varied.
A longitudinal slot 126 is cut in the wall of the cyl-inder 110 adjacent one end thereof, and the valve stem member 128 extends through the slot transversely of the cylinder and substantially tangentially thereto. The crank arm 149 extends through said slot 126.
The housing which encloses the slot 126 and surrounds ~ -~.~, .. .
6. ;~
, : . " . . . . , .. . j. .. , ~,.... . . .
~ . . . . ~ - . . . .. .. . . ~ , .
o6Z~7s ~ :
.~ . . .
the valve stem member 128 and crank arm 148 is constructed ~imi~
larly to the housing of Figs. 1 - 4 and provides a sealed en-closure for the chamber in the cylinder on the inner side of piston 114. The housing preferably comprises a curved substan-tially semi-cylindrical section 132 having its axis of curvature transverse to the axis of curvature of cylinder 110, bridging over and having its ends welded to the ends of the slot 126, and said section being sandwiched between two bars 134 extending along the sides of the slot and welded at 135 to the cylinder and at 135 to the edges of section 132.
As shown in Fig. 7, the reinforcing bars 134 extend into the cylinder 110 at their inner ends, as the cylinder 110 is of relatively larger diameter than cylinder 10 and the slot 126 is deeper than slot 26. Thus, the bars 134 have increased depths so as to give increased reinforcement to the cylinder against bellying out under pressure. Cap screws 137 may be provided to tie the bars 134 together within the ends of curved section 132.
The valve stem member 128 is journaled in the rein-forcing bars 134 of the housing by bearing bushings 138 held in place by plates 139 abutting the outer faces of the bars 134 and secured thereto by cap screws 140. O-ring seals are provided around the stem member. An indicator plate 152 may be secured to the end of valve stem member 128 for indicating the position of the valve (not shown) to which it is connected. ~
In the operation of the piston operator of Figs. 5 - 7, -;
assuming that the piston 114 is in the position of Fig. 5, pressure fluid is introduced through a port 142 in the right hand end cap 111 and exhausted through a duplicate port 142 in the ;
other end cap, causing the piston 114 to move to the left and rotate the crank arm 149 counterclockwise. The crank arm connec-tion with connector bar 146 provides for positively holding the ;~;
1~6Z975 valve stem member 128 in an intermediate position if desired.
While the construction of Figs. 5 - 7 produces maximum torque at the center of the stroke rather than at the beginning, sufficient starting torque is readily obtained by increasing the diameter of the piston and cylinder, and the increased size of the cylinder enables extending the reinforcing bars farther into the cylinder to reinforce it against bellying out under high internal pressure.
Moreover, the construction of Figs. 5 - 7 is easily assembled by connecting the piston, connector bar and crank arm together, and then inserting them, crank arm first, through the left end of the cylinder. When the crank arm reaches the arcu-ate chamber formed by section 132 between the bars 134 it drops down into the chamber in position to receive the valve stem ;
shaft 128 which is then inserted transversely of the chamber.
To disassemble, this procedure is reversed.
`' ~:' ' ' ~,' ' ~ . . ' .
'. ' ' ~''',',' ~ .
- , ~ . .
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~'~
8.
.
The cylinder indicated generally at 110 may be con- ~ -structed the same as cylinder 10 of standard steel tubing with end caps 111 held together by tie bolts 112. Reciprocable within ~;
cylinder 110 is a single piston 114 having a transverse wrist pin 145 therein pivotally connected to one end of a connector bar 146. The other end of bar 146 is a clevis 147 pivotally connected by pin 148 to one end of an oscillatable crank arm 149 having its other end welded to a collar 150 encircling the valve stem member 128 and non-rotatively secured thereto by keys 130.
Preferably, the end caps 111 have adjusting screws 117 therein for abutting the end of the crank arm ~ at one end of the cylinder and the face of piston 114 at the other end of the ~ ;
cylinder, so that the stroke of the piston may be varied.
A longitudinal slot 126 is cut in the wall of the cyl-inder 110 adjacent one end thereof, and the valve stem member 128 extends through the slot transversely of the cylinder and substantially tangentially thereto. The crank arm 149 extends through said slot 126.
The housing which encloses the slot 126 and surrounds ~ -~.~, .. .
6. ;~
, : . " . . . . , .. . j. .. , ~,.... . . .
~ . . . . ~ - . . . .. .. . . ~ , .
o6Z~7s ~ :
.~ . . .
the valve stem member 128 and crank arm 148 is constructed ~imi~
larly to the housing of Figs. 1 - 4 and provides a sealed en-closure for the chamber in the cylinder on the inner side of piston 114. The housing preferably comprises a curved substan-tially semi-cylindrical section 132 having its axis of curvature transverse to the axis of curvature of cylinder 110, bridging over and having its ends welded to the ends of the slot 126, and said section being sandwiched between two bars 134 extending along the sides of the slot and welded at 135 to the cylinder and at 135 to the edges of section 132.
As shown in Fig. 7, the reinforcing bars 134 extend into the cylinder 110 at their inner ends, as the cylinder 110 is of relatively larger diameter than cylinder 10 and the slot 126 is deeper than slot 26. Thus, the bars 134 have increased depths so as to give increased reinforcement to the cylinder against bellying out under pressure. Cap screws 137 may be provided to tie the bars 134 together within the ends of curved section 132.
The valve stem member 128 is journaled in the rein-forcing bars 134 of the housing by bearing bushings 138 held in place by plates 139 abutting the outer faces of the bars 134 and secured thereto by cap screws 140. O-ring seals are provided around the stem member. An indicator plate 152 may be secured to the end of valve stem member 128 for indicating the position of the valve (not shown) to which it is connected. ~
In the operation of the piston operator of Figs. 5 - 7, -;
assuming that the piston 114 is in the position of Fig. 5, pressure fluid is introduced through a port 142 in the right hand end cap 111 and exhausted through a duplicate port 142 in the ;
other end cap, causing the piston 114 to move to the left and rotate the crank arm 149 counterclockwise. The crank arm connec-tion with connector bar 146 provides for positively holding the ;~;
1~6Z975 valve stem member 128 in an intermediate position if desired.
While the construction of Figs. 5 - 7 produces maximum torque at the center of the stroke rather than at the beginning, sufficient starting torque is readily obtained by increasing the diameter of the piston and cylinder, and the increased size of the cylinder enables extending the reinforcing bars farther into the cylinder to reinforce it against bellying out under high internal pressure.
Moreover, the construction of Figs. 5 - 7 is easily assembled by connecting the piston, connector bar and crank arm together, and then inserting them, crank arm first, through the left end of the cylinder. When the crank arm reaches the arcu-ate chamber formed by section 132 between the bars 134 it drops down into the chamber in position to receive the valve stem ;
shaft 128 which is then inserted transversely of the chamber.
To disassemble, this procedure is reversed.
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~'~
8.
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Claims (7)
1. A linear piston operator for a rotary valve having a single cylinder, a piston in said cylinder, a connector bar connected to said piston, a rotary valve stem member extending transversely and substantially tangentially of said cylinder, said cylinder having a longitudinal slot adjacent said valve stem, an oscillatable element operatively connecting said connec-tor bar to said valve stem member and extending through said slot during oscillation, a housing partially surrounding said stem member and bridging over the slot and having its ends weld-ed to the cylinder at the ends of said slot, said housing having two longitudinal side bar portions welded to the cylinder along the sides of said slot, said side bar portions extending later-ally from their weldments a substantial distance into said cyl-inder to increase reinforcement thereof.
2. A linear piston operator for a rotary valve as defined in claim 1, wherein the cylinder has two axially aligned spaced-apart pistons therein, and the connector bar connects the two pistons.
3. A linear piston operator for a rotary valve as defined in claim 1, wherein the valve stem member is journaled in the two longitudinal side bars.
4. A linear piston operator for a rotary valve as defined in claim 1, wherein the housing forms a sealed enclosure for a pressure fluid storage cavity between the two pistons.
5. A linear piston operator for a rotary valve as defined in claim 1, wherein the oscillatable element is a crank arm secured to the valve stem member and pivotally connected at its outer end to the connector bar.
6. A linear piston operator for a rotary valve as defined in claim 5, wherein the valve stem member is journaled in the two longitudinal side bars.
7. A linear piston operator for a rotary valve as defined in claim 5, wherein the housing forms a sealed enclosure at one side of the piston, and the ends of the cylinder have ports for introducing and exhausting pressure fluid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61509675A | 1975-09-19 | 1975-09-19 | |
| US70772076A | 1976-07-20 | 1976-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062975A true CA1062975A (en) | 1979-09-25 |
Family
ID=27087406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA259,323A Expired CA1062975A (en) | 1975-09-19 | 1976-08-18 | Piston operator for imparting rotary motion |
Country Status (9)
| Country | Link |
|---|---|
| AU (1) | AU502794B2 (en) |
| CA (1) | CA1062975A (en) |
| DE (1) | DE2639960A1 (en) |
| FR (1) | FR2324966A1 (en) |
| GB (1) | GB1542417A (en) |
| IT (1) | IT1068044B (en) |
| MX (1) | MX143587A (en) |
| NL (1) | NL7610136A (en) |
| NO (1) | NO763191L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111089147A (en) * | 2020-01-07 | 2020-05-01 | 湖北三江航天红峰控制有限公司 | Microminiature precision transmission device suitable for friction load |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2012363B (en) * | 1978-01-09 | 1982-03-31 | Shafer H J | Linear piston operator for a rotary valve |
| DE2920236C2 (en) * | 1979-05-18 | 1986-01-09 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Switching device for a gear unit |
| US5924671A (en) * | 1996-04-12 | 1999-07-20 | Fisher Controls International, Inc. | Rotary valve actuator and linkage |
| US6076799A (en) * | 1996-04-12 | 2000-06-20 | Fisher Controls International, Inc. | Rotary valve actuator and linkage |
| CN101813175B (en) * | 2010-04-13 | 2012-11-14 | 史易兰商务咨询(上海)有限公司 | Driving component and using method thereof |
| US11313473B2 (en) | 2020-09-04 | 2022-04-26 | Hamilton Sundstrand Corporation | Butterfly valve with vibration resistant mount |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1068934B (en) * | ||||
| US2269382A (en) * | 1940-03-29 | 1942-01-06 | Clarence C Schmidt | Hydraulic actuated governor control |
| US3146681A (en) * | 1962-01-09 | 1964-09-01 | John M Sheesley | Plug valve operator |
| US3261266A (en) * | 1963-12-31 | 1966-07-19 | Ledeen Inc | Valve actuator |
| US3298286A (en) * | 1964-12-18 | 1967-01-17 | Grove Valve & Regulator Co | Valve operator |
| US3818808A (en) * | 1970-09-14 | 1974-06-25 | H Shafer | Dual cylinder operator for imparting rotary motion |
| US3709106A (en) * | 1970-09-14 | 1973-01-09 | H Shafer | Piston operator for imparting rotary motion |
| DE2344932A1 (en) * | 1972-10-19 | 1974-04-25 | Homer John Shafer | DOUBLE CYLINDER DRIVE FOR GENERATING A ROTATING MOVEMENT |
-
1976
- 1976-08-18 CA CA259,323A patent/CA1062975A/en not_active Expired
- 1976-08-27 AU AU17253/76A patent/AU502794B2/en not_active Expired
- 1976-09-02 GB GB7636472A patent/GB1542417A/en not_active Expired
- 1976-09-04 DE DE19762639960 patent/DE2639960A1/en not_active Ceased
- 1976-09-13 NL NL7610136A patent/NL7610136A/en not_active Application Discontinuation
- 1976-09-17 FR FR7627971A patent/FR2324966A1/en active Pending
- 1976-09-17 MX MX166323A patent/MX143587A/en unknown
- 1976-09-17 NO NO763191A patent/NO763191L/en unknown
- 1976-09-17 IT IT27359/76A patent/IT1068044B/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111089147A (en) * | 2020-01-07 | 2020-05-01 | 湖北三江航天红峰控制有限公司 | Microminiature precision transmission device suitable for friction load |
| CN111089147B (en) * | 2020-01-07 | 2021-04-30 | 湖北三江航天红峰控制有限公司 | Microminiature precision transmission device suitable for friction load |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1725376A (en) | 1978-03-02 |
| NO763191L (en) | 1977-03-22 |
| MX143587A (en) | 1981-06-05 |
| AU502794B2 (en) | 1979-08-09 |
| DE2639960A1 (en) | 1977-03-31 |
| FR2324966A1 (en) | 1977-04-15 |
| NL7610136A (en) | 1977-03-22 |
| GB1542417A (en) | 1979-03-21 |
| IT1068044B (en) | 1985-03-21 |
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