CA1076389A - Sealed motion transmitter - Google Patents
Sealed motion transmitterInfo
- Publication number
- CA1076389A CA1076389A CA295,053A CA295053A CA1076389A CA 1076389 A CA1076389 A CA 1076389A CA 295053 A CA295053 A CA 295053A CA 1076389 A CA1076389 A CA 1076389A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- spherical
- motion transmitter
- movable member
- chamber
- 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
Classifications
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0614—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part of the joint being open on two sides
-
- 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
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
-
- 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
- F16K41/00—Spindle sealings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pivots And Pivotal Connections (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
- Mechanical Control Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A sealed motion transmitter, especially adapted for use with fluid power devices, comprises a ball shaft intermediately pivotally supported in a housing by a pair of spaced-apart spherical bearings, with a fluid seal interposed between the bearings, resulting in a combination of low leakage and low actuation force which allows pivotal movement of one end of the shaft within a portion of the housing in communication with a pressurized portion of the fluid power device, while the other end is movable without such portion and is fluidically isolated therefrom by the seal.
A sealed motion transmitter, especially adapted for use with fluid power devices, comprises a ball shaft intermediately pivotally supported in a housing by a pair of spaced-apart spherical bearings, with a fluid seal interposed between the bearings, resulting in a combination of low leakage and low actuation force which allows pivotal movement of one end of the shaft within a portion of the housing in communication with a pressurized portion of the fluid power device, while the other end is movable without such portion and is fluidically isolated therefrom by the seal.
Description
(176~
BACKGROUND OF q~HE INVENq!ION
This invention relates generally as indicated to a sealed mo~ion transmitter, especially suited for u~e with fluid power devices and the like, for ~ransferring motion from the exterior to an enclosed, fluid pressurized portion of the de-vice with low frictional resistance and low leakage.
The design of fluid power devices frequently requixes the transfer of motion or movement to an enclosed, fluid pres-surized portion of the device from the exterior or from anothar isolated portion of the device. It is desirable that the fric-tional resistance to such movement ~e kept to a minimum to reduce the act~ation force necessary to transfer motion, while at the same time minimizing leakage from the fluid pressurized portion to the exterior or other isolated portion of the de-vice.
Heretofore, the most frequently used actuator for this purpose was a push-pull rod which enters the enclosed, fluid pressurized portion of the device through an opening which is sealed with an O-ring or the like. To transer motion to the enclosed portion of the device, the rod is simply moved back and forth with the compressed seal wiping the rod as i~
passes therethrough. This requires ~he application of un-desired hi~h forces to overcome the relatively high frictional re~istance between the seal and rod. Other known types o seals have been used to reduce the frictional resistance of these devices, but usually at a sacrifice in increased leakage, and~or substantially increased cost and complexity o the seals. An example of a much more complex seal bet~een two fluid mediums which allows for pivotal movement of a lever is shown in U. S. Patent No. 3,721,453.
SUMMARY OF THE INVENTION
With the..foregoing in mind, it is a principal object of this invention to provide a sealed motion transmitter ~or transmitting motion to an enclosed, fluid pressurized portion of a device from the exterior or another portion of the device providing a combination of low leakage and low actuation force.
Another object is to provide such a sealed motion transmitter that is highly reliable and relatively inexpensive to manufacture.
These and other objects of the present invention may be achieved by providing a sealed motion transmitter which may be used in combination with a fluid control device. The housing of the sealed motion transmitter has an inner chamber adapted for communication with a pressurized portion of the fluid control device and an enlarged chamber adjacent the inner chamber, with a shaft extending into and without the inner ... ^
chamber, respectively. The shaft has an intermediate ball portion supported by axially spaced apart spherical bearings in the enlarged chamber adjacent the inner chamber, whereby one of the shaft ends is movable within the inner chamber and the other shaft end is movable without the inner chambe.r. Seal means interposed between the spherical bearings cooperate with the ball portion of the shaft, the adjacent ends of the spherical bearings, and the enlarged chamber of the housing for fluidically isolating the shaft ends.
To the accomplishment of the foregoing and related ends, the invention, then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail a certain illustrative embodiment of the inven-tion, this being indicative, however, of but one of the variousways in which the principles of the invention may be employed.
BACKGROUND OF q~HE INVENq!ION
This invention relates generally as indicated to a sealed mo~ion transmitter, especially suited for u~e with fluid power devices and the like, for ~ransferring motion from the exterior to an enclosed, fluid pressurized portion of the de-vice with low frictional resistance and low leakage.
The design of fluid power devices frequently requixes the transfer of motion or movement to an enclosed, fluid pres-surized portion of the device from the exterior or from anothar isolated portion of the device. It is desirable that the fric-tional resistance to such movement ~e kept to a minimum to reduce the act~ation force necessary to transfer motion, while at the same time minimizing leakage from the fluid pressurized portion to the exterior or other isolated portion of the de-vice.
Heretofore, the most frequently used actuator for this purpose was a push-pull rod which enters the enclosed, fluid pressurized portion of the device through an opening which is sealed with an O-ring or the like. To transer motion to the enclosed portion of the device, the rod is simply moved back and forth with the compressed seal wiping the rod as i~
passes therethrough. This requires ~he application of un-desired hi~h forces to overcome the relatively high frictional re~istance between the seal and rod. Other known types o seals have been used to reduce the frictional resistance of these devices, but usually at a sacrifice in increased leakage, and~or substantially increased cost and complexity o the seals. An example of a much more complex seal bet~een two fluid mediums which allows for pivotal movement of a lever is shown in U. S. Patent No. 3,721,453.
SUMMARY OF THE INVENTION
With the..foregoing in mind, it is a principal object of this invention to provide a sealed motion transmitter ~or transmitting motion to an enclosed, fluid pressurized portion of a device from the exterior or another portion of the device providing a combination of low leakage and low actuation force.
Another object is to provide such a sealed motion transmitter that is highly reliable and relatively inexpensive to manufacture.
These and other objects of the present invention may be achieved by providing a sealed motion transmitter which may be used in combination with a fluid control device. The housing of the sealed motion transmitter has an inner chamber adapted for communication with a pressurized portion of the fluid control device and an enlarged chamber adjacent the inner chamber, with a shaft extending into and without the inner ... ^
chamber, respectively. The shaft has an intermediate ball portion supported by axially spaced apart spherical bearings in the enlarged chamber adjacent the inner chamber, whereby one of the shaft ends is movable within the inner chamber and the other shaft end is movable without the inner chambe.r. Seal means interposed between the spherical bearings cooperate with the ball portion of the shaft, the adjacent ends of the spherical bearings, and the enlarged chamber of the housing for fluidically isolating the shaft ends.
To the accomplishment of the foregoing and related ends, the invention, then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail a certain illustrative embodiment of the inven-tion, this being indicative, however, of but one of the variousways in which the principles of the invention may be employed.
-2 ~
~L~76389 BRIEF DESCRIPTION OF THE DRAWINGS
In the annexed ~rawings:
Fig~ 1 is a fragmentary sectional view through a preferred form of sealed motion transmitter constructed in accordance with this invention shown operatively connected to a conventional fluid power or control device or the like -2a ~g~7~;3i~!9 Fig. 2 is an enlargement of the sealed motion trans-mitter of Fig. l; and Fig. 3 is an end view of the sealed motion trans-mitter, as seen from the plane of the line 3-3 of Fig. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now in detail to the drawings, and initially to Fig. 1 thereof, there is illustrated a sealed motion trans-mitter 10 constructed in accordance with the present invention operatively connected to a fluid power or control device 11 ox the like, only a portion of which is shown for exemplary pur-poses. The sealed motion ~ransmi~ter comprises a housing 12 which may be an integral part of the housing for the fluid power device 11 as illustrated, or may be a separate unit suit-ably mounted thereon.
The housing 12 includes an interior chamber 14 in which a ball shaft or movable member 15 is in~ermediately mounted for pivotal movement by a pivot-seal structure 16. One end of the shaft 15 forms an inner arm 17 that is free to move in an inner portion 18 of the interior chamber 14. This inner portion 18, which may com~unicate directly wi~h the 1uid pre~surized portion 19 of the fluid power device 11, is desirably generally cylindrical, or if greater movement is desired, it may be ~apered as shown by the phantom lines 20 in Fig. 2 so that the diameter of the inner portion of the interior chamber increases away from the pivot-seal structure 16. The other end of the shaft 15 forms an outer arm 21 at the opposite side of the pivot-seal structure from the inner portion and either projects outwardly of the exterior of the housing or to another portion of the fluid control device.
As shown in ~ig. 1, the distal end 22 o the inner ~rm 17 may be rounded or ball shaped and disposed in a ` ~7631~9 bore 23 in an actuator arm, piston rod or other movable member 24 of the fluid power device. The actuator arm 24 may be gene-rally constrained for linear movement in a plane generally perpendicular to the longitudinal axis of the shaf~ 15. The outer arm 21 may be suitably connected to linkages or to another actuator, not shown.
As best seen in Fig. 2~ the pivot-seal structure 1~
comprises spaced-apar~ inner and outer spherical bearings 25 and 26, respectively, ~he spherical bearing surfaces 28 and 29 of which support the intermediate spherical portion 27 of the shaft 15. To allow for greater pivotal movement of the shaft, the re~pective edges 30 and 31 of the inner a~d outer bearings adja-cent the bearing surfaces may be beveled as shown.
The bearings are preferably made of a suitable plastic, for example, Torlon #4301 polyamide-imi~e, manufactured by Amoco Chemical Corporation. However, it should be understood that numerous other plastics and coated metals may also be used.
To prevent leakage of fluid from the pressurized por-tion of the device, the seal 32 is interposed in the space 33 between the spherical bearings 25, 26. The seal 32 comprises a ring which conorms to the periphery of the spherical portion 27 of the shat adjacent thereto and fluidically separates the respective ends o the shaft. Preferably, the ring seal 32 is made of an elastomeric material, and is either in the form of a conventional O-ring or more preferably a "quadl' ring seal which provides low friction combined with negligible leakage. How-ever, various other types of seals or packings may also be used.
The bearings and seal are contained in an enlarged cylindrical portion 34 of the interior chamber 14 adjacent the inner portion 18 thereof, which forms a sho~lder 35 at the
~L~76389 BRIEF DESCRIPTION OF THE DRAWINGS
In the annexed ~rawings:
Fig~ 1 is a fragmentary sectional view through a preferred form of sealed motion transmitter constructed in accordance with this invention shown operatively connected to a conventional fluid power or control device or the like -2a ~g~7~;3i~!9 Fig. 2 is an enlargement of the sealed motion trans-mitter of Fig. l; and Fig. 3 is an end view of the sealed motion trans-mitter, as seen from the plane of the line 3-3 of Fig. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now in detail to the drawings, and initially to Fig. 1 thereof, there is illustrated a sealed motion trans-mitter 10 constructed in accordance with the present invention operatively connected to a fluid power or control device 11 ox the like, only a portion of which is shown for exemplary pur-poses. The sealed motion ~ransmi~ter comprises a housing 12 which may be an integral part of the housing for the fluid power device 11 as illustrated, or may be a separate unit suit-ably mounted thereon.
The housing 12 includes an interior chamber 14 in which a ball shaft or movable member 15 is in~ermediately mounted for pivotal movement by a pivot-seal structure 16. One end of the shaft 15 forms an inner arm 17 that is free to move in an inner portion 18 of the interior chamber 14. This inner portion 18, which may com~unicate directly wi~h the 1uid pre~surized portion 19 of the fluid power device 11, is desirably generally cylindrical, or if greater movement is desired, it may be ~apered as shown by the phantom lines 20 in Fig. 2 so that the diameter of the inner portion of the interior chamber increases away from the pivot-seal structure 16. The other end of the shaft 15 forms an outer arm 21 at the opposite side of the pivot-seal structure from the inner portion and either projects outwardly of the exterior of the housing or to another portion of the fluid control device.
As shown in ~ig. 1, the distal end 22 o the inner ~rm 17 may be rounded or ball shaped and disposed in a ` ~7631~9 bore 23 in an actuator arm, piston rod or other movable member 24 of the fluid power device. The actuator arm 24 may be gene-rally constrained for linear movement in a plane generally perpendicular to the longitudinal axis of the shaf~ 15. The outer arm 21 may be suitably connected to linkages or to another actuator, not shown.
As best seen in Fig. 2~ the pivot-seal structure 1~
comprises spaced-apar~ inner and outer spherical bearings 25 and 26, respectively, ~he spherical bearing surfaces 28 and 29 of which support the intermediate spherical portion 27 of the shaft 15. To allow for greater pivotal movement of the shaft, the re~pective edges 30 and 31 of the inner a~d outer bearings adja-cent the bearing surfaces may be beveled as shown.
The bearings are preferably made of a suitable plastic, for example, Torlon #4301 polyamide-imi~e, manufactured by Amoco Chemical Corporation. However, it should be understood that numerous other plastics and coated metals may also be used.
To prevent leakage of fluid from the pressurized por-tion of the device, the seal 32 is interposed in the space 33 between the spherical bearings 25, 26. The seal 32 comprises a ring which conorms to the periphery of the spherical portion 27 of the shat adjacent thereto and fluidically separates the respective ends o the shaft. Preferably, the ring seal 32 is made of an elastomeric material, and is either in the form of a conventional O-ring or more preferably a "quadl' ring seal which provides low friction combined with negligible leakage. How-ever, various other types of seals or packings may also be used.
The bearings and seal are contained in an enlarged cylindrical portion 34 of the interior chamber 14 adjacent the inner portion 18 thereof, which forms a sho~lder 35 at the
3~3~
intersection of the two portions. The enlarged por~ion 34 opens outwardly ~rom the shoulder 3S to the exterior of the housing 12 so tha~ the bearings 25, 26 and saal 32 may be readily assembled therein. A cover 36 secured to the exterior of the housing by means of screws 37 or the like retains the bearings and seal in the desired assembled relation within the enlarged portion 34. An opening 38 is provided in the cover through which the shaft outer arm portion 21 projects, with the size of the opening being sufficient to allow for adequate movement of the outer arm.
To eliminate axial play of the ball sha~t, the bear-ings 25, 26 are desirably preloaded by means of a wave spring washer 39 or the like disposed between the inner bearings 25 and shoulder 35.
As will be apparent, the sealed motion transmitter conveys motion, applied at substantially right angles to the shaft center line, to an enclosed, fluid pressuriæed portion of the device from the exterior thereof, or vice versa, with low frictional resistance and low leakage. Thus, for example, ~0 movement of the outer arm will result in similar but mirrored movement of the inner arm which in turn effects linear movement of the actuator arm 24. In similar fashion, movement of the arm 24 will effect movement of the outer arm and linka~es con-nected thereto. It will also be appreciated that the transmitter may be used in various other ways ~o e~fec~ more complex move-ments as the shaft is not limited to pivotal movement in only one plane.
Although the invention has been shown and described with respect to a preferred embodiment, it is obvious that equivalent alterations and modifications will occur to others ~7~389~ ~
skilled in the art upon the reaaing ana unaerstanding of the specification. The present invention includes all such equi-valent alterations and modifica~ions, and is limited only by the scope of the claims.
intersection of the two portions. The enlarged por~ion 34 opens outwardly ~rom the shoulder 3S to the exterior of the housing 12 so tha~ the bearings 25, 26 and saal 32 may be readily assembled therein. A cover 36 secured to the exterior of the housing by means of screws 37 or the like retains the bearings and seal in the desired assembled relation within the enlarged portion 34. An opening 38 is provided in the cover through which the shaft outer arm portion 21 projects, with the size of the opening being sufficient to allow for adequate movement of the outer arm.
To eliminate axial play of the ball sha~t, the bear-ings 25, 26 are desirably preloaded by means of a wave spring washer 39 or the like disposed between the inner bearings 25 and shoulder 35.
As will be apparent, the sealed motion transmitter conveys motion, applied at substantially right angles to the shaft center line, to an enclosed, fluid pressuriæed portion of the device from the exterior thereof, or vice versa, with low frictional resistance and low leakage. Thus, for example, ~0 movement of the outer arm will result in similar but mirrored movement of the inner arm which in turn effects linear movement of the actuator arm 24. In similar fashion, movement of the arm 24 will effect movement of the outer arm and linka~es con-nected thereto. It will also be appreciated that the transmitter may be used in various other ways ~o e~fec~ more complex move-ments as the shaft is not limited to pivotal movement in only one plane.
Although the invention has been shown and described with respect to a preferred embodiment, it is obvious that equivalent alterations and modifications will occur to others ~7~389~ ~
skilled in the art upon the reaaing ana unaerstanding of the specification. The present invention includes all such equi-valent alterations and modifica~ions, and is limited only by the scope of the claims.
Claims (9)
1. A sealed motion transmitter comprising a housing having an interior chamber, a movable member having opposite end portions and an inter-mediate spherical portion, axially spaced apart spherical bearing means in said interior chamber of said housing for supporting said intermediate spherical portion for pivotal movement of said movable member, and seal means interposed between said spherical bearing means and surrounding said intermediate portion of said movable member and in sealing engagement with said intermediate spherical portion and said interior chamber for fluidically separating said opposite end portions of said movable member.
2. The sealed motion transmitter of claim 1 wherein said seal means comprises an elastomeric ring.
3. The sealed motion transmitter of claim 2 wherein said ring is a quad ring.
4. The sealed motion transmitter of claim 1 further comprising means for preloading said bearing means.
5. The sealed motion transmitter of claim 4 wherein said means for preloading comprises a wave spring washer.
6. The sealed motion transmitter of claim 5 wherein said interior chamber has an enlarged cylindrical portion f or receipt of said intermediate spherical portion of said movable member and said axially spaced spherical bearing means, said enlarged cylindrical portion having a shoulder at one end, said washer being interposed between said shoulder and the adjacent end of one of said spherical bearing means.
7. The sealed motion transmitter of claim 6 further comprising a cover over the other end of said portion for retaining said intermediate spherical portion, spherical bearing means, and seal means in assembled relation within said portion.
8. The sealed motion transmitter of claim 1 further comprising an actuator constrained for movement substantially perpendicular to the longitudinal axis of said movable member, said actuator having an opening therein for receipt of one end of said movable member, whereby pivotal movement of said movable member will effect linear movement of said actuator.
9. A sealed motion transmitter in combination with a fluid control device comprising a housing having an inner chamber adapted for communication with a pressurized portion of said fluid control device and an enlarged chamber adjacent said inner chamber, a shaft having opposite ends extending into and without said inner chamber, respectively, and means mounting said shaft in said enlarged chamber intermediate the ends thereof for pivotal movement of said shaft, said last-mentioned means comprising axially spaced apart spherical bearings in said enlarged chamber adjacent said inner chamber, said shaft having an inter-mediate ball portion supported by said spherical bearings, whereby one of said ends of said shaft is movable within said inner chamber and the other of said shaft ends is movable without said inner chamber, and seal means interposed between said spherical bearings and cooperative with said ball portion of said shaft, the adjacent ends of said spherical bearings and said enlarged chamber of said housing for fluidically isolating said shaft ends.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US79793977A | 1977-05-18 | 1977-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1076389A true CA1076389A (en) | 1980-04-29 |
Family
ID=25172157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,053A Expired CA1076389A (en) | 1977-05-18 | 1978-01-16 | Sealed motion transmitter |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS53141862A (en) |
| CA (1) | CA1076389A (en) |
| DE (1) | DE2807775A1 (en) |
| IL (1) | IL53731A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6941334B2 (en) * | 2015-11-06 | 2021-09-29 | 株式会社ソミックマネージメントホールディングス | Ball joint |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1250205B (en) * | 1965-05-24 | |||
| DE2143551A1 (en) * | 1971-08-31 | 1973-03-08 | Awtomobil Nij Sawod Im Leninsk | GEAR SHIFTING FOR MOTOR VEHICLE TRANSMISSION |
| US3813178A (en) * | 1972-08-10 | 1974-05-28 | Trw Inc | Wear indicating joint |
-
1978
- 1978-01-02 IL IL53731A patent/IL53731A/en unknown
- 1978-01-16 CA CA295,053A patent/CA1076389A/en not_active Expired
- 1978-02-23 DE DE19782807775 patent/DE2807775A1/en not_active Withdrawn
- 1978-05-15 JP JP5672578A patent/JPS53141862A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| IL53731A (en) | 1981-01-30 |
| DE2807775A1 (en) | 1978-11-30 |
| IL53731A0 (en) | 1978-04-30 |
| JPS6115290B2 (en) | 1986-04-23 |
| JPS53141862A (en) | 1978-12-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |