CA1076828A - Propeller shaft liner - Google Patents
Propeller shaft linerInfo
- Publication number
- CA1076828A CA1076828A CA270,972A CA270972A CA1076828A CA 1076828 A CA1076828 A CA 1076828A CA 270972 A CA270972 A CA 270972A CA 1076828 A CA1076828 A CA 1076828A
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- Canada
- Prior art keywords
- liner
- tube
- grooves
- shaft
- liner according
- Prior art date
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
PROPELLER SHAFT LINER
ABSTRACT OF THE DISCLOSURE
An improved propeller shaft liner of the type em-ployed to damp propeller shaft vibrations and apparatus for inserting such liner into the properller shaft. A tubular liner of paper is formed with a symmetrically disposed series of axially or helically extending groove-like indentations which provide the formed liner tube with a resiliently re-sisted radial and circumferential compressibility character-istic. This compressibility enables the liner to be inserted into a propeller shaft having an internal diameter less than the outer diameter of the liner, with the liner being sym-metrically deformed to engage the shaft in an accurately centered position to achieve a proper rotary balance of the shaft. Apparatus for inserting the tube into shaft is also disclosed.
ABSTRACT OF THE DISCLOSURE
An improved propeller shaft liner of the type em-ployed to damp propeller shaft vibrations and apparatus for inserting such liner into the properller shaft. A tubular liner of paper is formed with a symmetrically disposed series of axially or helically extending groove-like indentations which provide the formed liner tube with a resiliently re-sisted radial and circumferential compressibility character-istic. This compressibility enables the liner to be inserted into a propeller shaft having an internal diameter less than the outer diameter of the liner, with the liner being sym-metrically deformed to engage the shaft in an accurately centered position to achieve a proper rotary balance of the shaft. Apparatus for inserting the tube into shaft is also disclosed.
Description
i~7682~3 1 The present invention is directed to propeller
2 shaft liners of the type disclosed in Rowland et al United States patent No. 2,751,765. Liners of this type are custom-4 ¦ arily manufactured by convolutely winding an outer layer or 5 ¦ ply of corrugated paper upon a wound paper tube with the outer ~ ¦ or envelope diameter of the corrugated outer layer slightly 7 ¦ exceeding the internal diameter of the hollow propeller shaft 8 ¦ into which the liner is to be inserted. When the tube is in-9 ~ serted into the shaft, the corrugations of the outer layer are 10 ¦ compressed against the inner wall of the shaft and are thus 11 ¦ capable of absorbing and damping propeller sha~t vibrations.
12 ¦ The wrapping or winding of the final layer of cor-13 ¦ rugated paper on the exterior of the liner tube requires 14 ¦ specialized eq~pment for handling the corrugated strips during 15 ¦ the winding operation, and the relatively fragile corrugations lB ¦ exposed on the exterior of the tube require some care in hand-17 ~ ling operations prior to and during the insertion of the liner 18 ¦ into the shaft~ Optimum vibration damping characteristics 19 ¦ will be achieved when the liner is in firm, uniform centered 20 ¦ engagement with the tube over the entire external surface of 21 ¦ the liner.
22 The present invention is especially directed toward 23 the construction of a propeller shaft liner which does not ~4 employ an outer layer of corrugated material, but instead em-ploys a smooth paper tube having a relatively small number of ~B relatively deep axially or helically extending indentations ~7 in its outer surface, the indentations being of such a depth ~8 as to form corresponding ribs in the interior surface of the ~ liner.
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~ 10~68Z8 1 ¦ propeller shaft liner is formed from a paper tube by impress-2 ¦ ing or rolling a number of axially or helically extending in-5 ¦ dentations or grooves in the tube wall. The grooves or in-4 ¦ dentations effectively divide the tube circumference into a 5 ¦ plurality of individual segments interconnected by cusp-like 8 ¦ ribs which resiliently resist circ~mferential compression of 7 ¦ the tube. By employing a relatively small number of such in-8 ¦ dentations, preferably at least three, a relatively large sur-g ¦ face area of contact can be achieved between the external sur-10 ¦ face of the liner and the inner wall of the propeller shaft 11 ¦ to increase the vibration absorption characteristic of the 12 ¦ inserted liner. In the prior art construction employing a cor- `
13 ¦ rugated outer ply on the liner, the relatively large number of 14 ¦ "grooves" in the corrugated material presented a substantial 15 ¦ limit to the area of contact between shaft and liner.
16 ¦ The indentations or grooves employed in the present 17 ¦ invention are relatively deep and deform the liner wall to the 18 ¦ extent that radially inwardly projecting ribs are formed on 19 ¦ the inner side of the liner which are of a cusp-like configura-20 ¦ tion when the liner is viewed in transverse cross-section.
21 ¦ The side walls of the ribs thus formed are inclined relative 22 ¦ to each other and by flexing and compression resiliently re-23 ¦ sist circumferential movement of the circumferential segments 24 ¦ between the ribs toward each other as the liner is circum-25 ¦ ferentially compressed during insertion into the propeller ~6 ¦ shaft, whose internal diameter is slightly less than the nor-a7 ¦ mal or uncompressed diameter of the liner.
~8 ¦ To facilitate insertion of a liner into a propeller ¦ shaft, an inserting apparatus is provided which includes a sizing ring having an internal annular shoulder dimensioned to ~ 10768Z8 1 seat upon one end of a propeller shaft. A tapered bore in the 2 sizing ring progressively compresses the circumference of the
12 ¦ The wrapping or winding of the final layer of cor-13 ¦ rugated paper on the exterior of the liner tube requires 14 ¦ specialized eq~pment for handling the corrugated strips during 15 ¦ the winding operation, and the relatively fragile corrugations lB ¦ exposed on the exterior of the tube require some care in hand-17 ~ ling operations prior to and during the insertion of the liner 18 ¦ into the shaft~ Optimum vibration damping characteristics 19 ¦ will be achieved when the liner is in firm, uniform centered 20 ¦ engagement with the tube over the entire external surface of 21 ¦ the liner.
22 The present invention is especially directed toward 23 the construction of a propeller shaft liner which does not ~4 employ an outer layer of corrugated material, but instead em-ploys a smooth paper tube having a relatively small number of ~B relatively deep axially or helically extending indentations ~7 in its outer surface, the indentations being of such a depth ~8 as to form corresponding ribs in the interior surface of the ~ liner.
In accordance with the present invention, a , ': i ~
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~ 10~68Z8 1 ¦ propeller shaft liner is formed from a paper tube by impress-2 ¦ ing or rolling a number of axially or helically extending in-5 ¦ dentations or grooves in the tube wall. The grooves or in-4 ¦ dentations effectively divide the tube circumference into a 5 ¦ plurality of individual segments interconnected by cusp-like 8 ¦ ribs which resiliently resist circ~mferential compression of 7 ¦ the tube. By employing a relatively small number of such in-8 ¦ dentations, preferably at least three, a relatively large sur-g ¦ face area of contact can be achieved between the external sur-10 ¦ face of the liner and the inner wall of the propeller shaft 11 ¦ to increase the vibration absorption characteristic of the 12 ¦ inserted liner. In the prior art construction employing a cor- `
13 ¦ rugated outer ply on the liner, the relatively large number of 14 ¦ "grooves" in the corrugated material presented a substantial 15 ¦ limit to the area of contact between shaft and liner.
16 ¦ The indentations or grooves employed in the present 17 ¦ invention are relatively deep and deform the liner wall to the 18 ¦ extent that radially inwardly projecting ribs are formed on 19 ¦ the inner side of the liner which are of a cusp-like configura-20 ¦ tion when the liner is viewed in transverse cross-section.
21 ¦ The side walls of the ribs thus formed are inclined relative 22 ¦ to each other and by flexing and compression resiliently re-23 ¦ sist circumferential movement of the circumferential segments 24 ¦ between the ribs toward each other as the liner is circum-25 ¦ ferentially compressed during insertion into the propeller ~6 ¦ shaft, whose internal diameter is slightly less than the nor-a7 ¦ mal or uncompressed diameter of the liner.
~8 ¦ To facilitate insertion of a liner into a propeller ¦ shaft, an inserting apparatus is provided which includes a sizing ring having an internal annular shoulder dimensioned to ~ 10768Z8 1 seat upon one end of a propeller shaft. A tapered bore in the 2 sizing ring progressively compresses the circumference of the
3 liner as it is advanced through the sizing ring to a diameter
4 slightly less than that of the internal diameter of the bore
5 while maintaining the advancing liner in coaxial alignment 8 with the bore. The opposite end of the liner is seated in a 7 pusher block which in turn is seated in a guide block, the two 8 blocks, when seated, cooperatively defining an annular groove 9 which receives one end of the tubular liner. The pusher block 10 and guide block are respectively mounted on each of a pair of 11 two telescopic piston rods which in turn are driven in axial 3 12 reciprocation by a two-stage fluid pressure actuated motor.
13 During the major portion of insertion of a tube into a shaft, 14 the two blocks move together. As the conclusion of the inser-1~ tion approaches, the guide block engages the sizing ring and 18 is held stationary while the pusher block continues to advance 17 through the sizing ring to push the final end of the liner 18 into the propeller shaft to a predetermined position.
19 Other objects and features of the invention will be-80 come apparent by reference to the following specification and 21 to the drawings.
22 Figure 1 is a side elevational view, with certain 23 parts broken away, showing a propeller shaft assembly having a ~4 liner in accordance with the present invention;
25 ¦ Figure 2 is a transverse cross-sectional view taken ~6 ¦ on the line 2-2 of Figure l;
~7 ¦ Figure 3 is a perspective view of an end portion of as ¦ one form of liner embodying the present invention;
¦ Figure 4 is a view similar to Figure 3 showing 30 ¦ another form of liner;
- I _3_ 1~76828 1 Figure 5 is a detailed cross-sectional view, taken 2 on a central axial plane showing a portion of the apparatus for inserting a liner into a shaft; and 4 Figure 6 is a detailed cross-sectional view of the 5 fluid pressure motor employed with the apparatus of Figure S. `
8 Referring first to Figure 1, there is shown a pro-7 peller shaft assembly designated generally 10 which may be -8 assumed to be of conventional construction and which includes 9 a hollow, cylindrical shaft 12 having a pair of coupling caps 10 13 fixedly secured or welded to its opposite ends. A pro~ ~ --11 peller shaft liner designated generally 14 is located within 12 the interior of shaft 12 in a press fit relationship, the 13 axial length of liner 14 being substantially equal to the axial ~ `
14 length of the tubular shaft 12. The liner, although stiff, is --resiliently flexible to permit limited radial compression and 1~ expansion thereof.
17 As best seen in the cross-sectional view of Figure 2, 18 a liner 14 embodying the present invention comprises a hollow 19 tube of wound paperboard or other fibrous material and having a plurality of longitudinally extending, concavo-convex in-21 dentations or inward deformations 16 of the liner wall which 22 produce radially inwardly projecting cusp-like ribs 18 in the 23 interior of the tubular liner. The indentations 16 effect-ively divide the tube circumference, as viewed in Figure 2, into a plurality of circumferential segments 20 which are ~6 symmetrically spaced about the axis of the tubular liner 14.
~7 Referring to Figures 3 and 4, the indentations 16 as and the corresponding internal rib 18 may extend axially of the tube as shown in Figure 3 or may extend helically of the ~0 tube as at 16' in Figure 4. In either event, a cross-1~768Z8 1 sectional view of a propeller shaft having a liner ln the form 2 of Figure 3 or in the form of Figure 4 will present a cross-3 sectional configuration as shown in Figure 2.
4 Liners according to the present invention are fre-quently constructed from a multi-ply paper tube in which the B various plies are laid up in the form of spirally wound strips.
7 In the case where such a tube is employed for the liner of the 8 kind shown in Figure 4, the helical grooves or indentations 16' 9 are preferably formed with a pitch opposite to that of the wound paper strips, the boundary between adjacent turns of 11 the wound paper material being indicated at 22 in Figure 4.
12 The grooves or indentations 16 or 16' of the liners 13 of Figures 3 and 4 may be formed by passing the tube axially 14 through an appropriately conformed set of die rollers. In the formation of the indentations 16, the wall of the origin-16 ally cylindrical paper tube is deformed through its entire 17 thickness to produce internally projecting ribs 18 in corres-18 pondence with the grooves or deformations 16 on the outer sur-19 face of the tube. The normal or relaxed outside diameter of the formed tube as shown in Figures 3 and 4 is selected to 21 be somewhat greater than the internal diameter of the hollow 22 shaft 12 into which the liner subsequently is to be inserted.
23 As is shown in Figures 3 and 4, subsequent to the ~4 formation of the liner and prior to its insertion into the shaft 12, the liner, as viewed in cross-section, is made up ~6 of a group of symmetrically disposed outwardly bowed circum-~7 ferential segments 20 integrally connected to each other by ~8 inwardly projecting ribs 18 of a generally V-shaped cross-section. As the overall outside diameter of the tubular liner is reduced, as by applying a radially inwardly directed 10'7~i~28 1 pressure uniformly around its entire circumference, the cor-2 responding reduction in circumference of the liner requires the 3 individual circumferential segments 20 to move toward each 4 other by squeezing the open ends of the V-shaped ribs 18 toward each other. This action is resisted by the ribs, which develop a reactive force opposing the approaching movement of adjacent 7 circumferential segments 20 and this force in turn tends to B bow the individual segments 20 radially outwardly. The reduc-9 tion in diameter is thus resiliently resisted by the liner conformation to produce a radially outwardly directed force 11 urging the circumferential segments 20 firmly into engagement 12 with the interior surface of tube 12.
13 The symmetrical configuration of the grooves circum-14 ferentially about the central axis provides a uniform and sym- ;
metrically applied force of engagement of the liner with its 16 shaft and the area of engagement occurs over substantially the 17 entire extent of circumferential segments 20, the areaof con-18 tact being reduced only in the ~egions closely adjacent the 19 centerline of the various grooves and the width of the groove openings, as developed above, is progressively reduced as the 21 outer diameter of the liner is reduced.
22 To obtain optimum damping against hoop-type or cir-23 cumferential vibration, the number of indentations is prefer-~4 ably selected as an odd number with a preferred minimum number of grooves 16 being three.
26 In Figures 5 and 6, an apparatus for inserting 27 liners such as those described above into hollow tubular ~8 shafts 12 is disclosed. Such apparatus includes an annular as sizing ring designated generally 30 which is counterbored at one end as at 32 to form a radial shoulder 34 which is 1 adapted to be seated upon the end of a tube 12 as shown in 2 Figure 5. A bore 36 tapers inwardly from the opposite axial 3 end of sizing ring 30, bore 36 tapering from a maximum dia-4 meter at its outer end which is slightly greater than the normal or relaxed outer diameter of a liner 14 to a minimum ~ diameter at its inner end which i5 equal to or slightly less 7 than the internal diameter of the tube 12 into which liner 14 8 is to be inserted. As liner 14 is advanced axially through9 ring 30 from right to left as viewed in Figure 5, the outer 1~ diameter of liner 14 is progressively compressed to a diameter 11 such that it can be fed into the interior of tube 12 without 12 interference. ~:
13 To supply the force necessary to advance liner 14 14 through sizing ring 30 into shaft 12, a cooperating pusher l5 member designated generally 38 and guide block 40 are coupled :.
16 through respective telescopic piston rods 42 and 44 to a two- ~ ~:
17 stage fluid pressure cylinder 46 (Figure 6).
18 Pusher block 38 is disc-like in configuration and 19 is formed with a main body portion 48 of a diameter less than 20 the internal diameter of liner 14 and a radially projecting ~:~
21 flange 50 dimensioned to seat upon the end of liner 14, but 22 having a diameter slightly less than the minimum internal 23 diameter of sizing ring 30 and the internal diameter of shaft ~4 12 so that the pusher member can be advanced through the siz-ing ring and into the interior of tube 12. Pusher member 38 ~6 is fixedly secured to the end of its piston rod 42 as by a ~7 threaded connection 52. :
~8 Guide block 40 is counterbored as at 54 to form a radially inwardly projecting shoulder 56 which, with bore 54, ~0 provides a seat for receiving flange 50 of pusher block 38.
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1 A tapered bore 58 flaring outwardly from counterbore 54 tapers 2 from a maximum diameter slighly greater than the outer diam-3 eter of liner 14 to a minimum diameter just slightly greater 4 than the diameter of flange 50. As best seen in Figure 5, when pusher member 38 is seated in guide block 40, tapered
13 During the major portion of insertion of a tube into a shaft, 14 the two blocks move together. As the conclusion of the inser-1~ tion approaches, the guide block engages the sizing ring and 18 is held stationary while the pusher block continues to advance 17 through the sizing ring to push the final end of the liner 18 into the propeller shaft to a predetermined position.
19 Other objects and features of the invention will be-80 come apparent by reference to the following specification and 21 to the drawings.
22 Figure 1 is a side elevational view, with certain 23 parts broken away, showing a propeller shaft assembly having a ~4 liner in accordance with the present invention;
25 ¦ Figure 2 is a transverse cross-sectional view taken ~6 ¦ on the line 2-2 of Figure l;
~7 ¦ Figure 3 is a perspective view of an end portion of as ¦ one form of liner embodying the present invention;
¦ Figure 4 is a view similar to Figure 3 showing 30 ¦ another form of liner;
- I _3_ 1~76828 1 Figure 5 is a detailed cross-sectional view, taken 2 on a central axial plane showing a portion of the apparatus for inserting a liner into a shaft; and 4 Figure 6 is a detailed cross-sectional view of the 5 fluid pressure motor employed with the apparatus of Figure S. `
8 Referring first to Figure 1, there is shown a pro-7 peller shaft assembly designated generally 10 which may be -8 assumed to be of conventional construction and which includes 9 a hollow, cylindrical shaft 12 having a pair of coupling caps 10 13 fixedly secured or welded to its opposite ends. A pro~ ~ --11 peller shaft liner designated generally 14 is located within 12 the interior of shaft 12 in a press fit relationship, the 13 axial length of liner 14 being substantially equal to the axial ~ `
14 length of the tubular shaft 12. The liner, although stiff, is --resiliently flexible to permit limited radial compression and 1~ expansion thereof.
17 As best seen in the cross-sectional view of Figure 2, 18 a liner 14 embodying the present invention comprises a hollow 19 tube of wound paperboard or other fibrous material and having a plurality of longitudinally extending, concavo-convex in-21 dentations or inward deformations 16 of the liner wall which 22 produce radially inwardly projecting cusp-like ribs 18 in the 23 interior of the tubular liner. The indentations 16 effect-ively divide the tube circumference, as viewed in Figure 2, into a plurality of circumferential segments 20 which are ~6 symmetrically spaced about the axis of the tubular liner 14.
~7 Referring to Figures 3 and 4, the indentations 16 as and the corresponding internal rib 18 may extend axially of the tube as shown in Figure 3 or may extend helically of the ~0 tube as at 16' in Figure 4. In either event, a cross-1~768Z8 1 sectional view of a propeller shaft having a liner ln the form 2 of Figure 3 or in the form of Figure 4 will present a cross-3 sectional configuration as shown in Figure 2.
4 Liners according to the present invention are fre-quently constructed from a multi-ply paper tube in which the B various plies are laid up in the form of spirally wound strips.
7 In the case where such a tube is employed for the liner of the 8 kind shown in Figure 4, the helical grooves or indentations 16' 9 are preferably formed with a pitch opposite to that of the wound paper strips, the boundary between adjacent turns of 11 the wound paper material being indicated at 22 in Figure 4.
12 The grooves or indentations 16 or 16' of the liners 13 of Figures 3 and 4 may be formed by passing the tube axially 14 through an appropriately conformed set of die rollers. In the formation of the indentations 16, the wall of the origin-16 ally cylindrical paper tube is deformed through its entire 17 thickness to produce internally projecting ribs 18 in corres-18 pondence with the grooves or deformations 16 on the outer sur-19 face of the tube. The normal or relaxed outside diameter of the formed tube as shown in Figures 3 and 4 is selected to 21 be somewhat greater than the internal diameter of the hollow 22 shaft 12 into which the liner subsequently is to be inserted.
23 As is shown in Figures 3 and 4, subsequent to the ~4 formation of the liner and prior to its insertion into the shaft 12, the liner, as viewed in cross-section, is made up ~6 of a group of symmetrically disposed outwardly bowed circum-~7 ferential segments 20 integrally connected to each other by ~8 inwardly projecting ribs 18 of a generally V-shaped cross-section. As the overall outside diameter of the tubular liner is reduced, as by applying a radially inwardly directed 10'7~i~28 1 pressure uniformly around its entire circumference, the cor-2 responding reduction in circumference of the liner requires the 3 individual circumferential segments 20 to move toward each 4 other by squeezing the open ends of the V-shaped ribs 18 toward each other. This action is resisted by the ribs, which develop a reactive force opposing the approaching movement of adjacent 7 circumferential segments 20 and this force in turn tends to B bow the individual segments 20 radially outwardly. The reduc-9 tion in diameter is thus resiliently resisted by the liner conformation to produce a radially outwardly directed force 11 urging the circumferential segments 20 firmly into engagement 12 with the interior surface of tube 12.
13 The symmetrical configuration of the grooves circum-14 ferentially about the central axis provides a uniform and sym- ;
metrically applied force of engagement of the liner with its 16 shaft and the area of engagement occurs over substantially the 17 entire extent of circumferential segments 20, the areaof con-18 tact being reduced only in the ~egions closely adjacent the 19 centerline of the various grooves and the width of the groove openings, as developed above, is progressively reduced as the 21 outer diameter of the liner is reduced.
22 To obtain optimum damping against hoop-type or cir-23 cumferential vibration, the number of indentations is prefer-~4 ably selected as an odd number with a preferred minimum number of grooves 16 being three.
26 In Figures 5 and 6, an apparatus for inserting 27 liners such as those described above into hollow tubular ~8 shafts 12 is disclosed. Such apparatus includes an annular as sizing ring designated generally 30 which is counterbored at one end as at 32 to form a radial shoulder 34 which is 1 adapted to be seated upon the end of a tube 12 as shown in 2 Figure 5. A bore 36 tapers inwardly from the opposite axial 3 end of sizing ring 30, bore 36 tapering from a maximum dia-4 meter at its outer end which is slightly greater than the normal or relaxed outer diameter of a liner 14 to a minimum ~ diameter at its inner end which i5 equal to or slightly less 7 than the internal diameter of the tube 12 into which liner 14 8 is to be inserted. As liner 14 is advanced axially through9 ring 30 from right to left as viewed in Figure 5, the outer 1~ diameter of liner 14 is progressively compressed to a diameter 11 such that it can be fed into the interior of tube 12 without 12 interference. ~:
13 To supply the force necessary to advance liner 14 14 through sizing ring 30 into shaft 12, a cooperating pusher l5 member designated generally 38 and guide block 40 are coupled :.
16 through respective telescopic piston rods 42 and 44 to a two- ~ ~:
17 stage fluid pressure cylinder 46 (Figure 6).
18 Pusher block 38 is disc-like in configuration and 19 is formed with a main body portion 48 of a diameter less than 20 the internal diameter of liner 14 and a radially projecting ~:~
21 flange 50 dimensioned to seat upon the end of liner 14, but 22 having a diameter slightly less than the minimum internal 23 diameter of sizing ring 30 and the internal diameter of shaft ~4 12 so that the pusher member can be advanced through the siz-ing ring and into the interior of tube 12. Pusher member 38 ~6 is fixedly secured to the end of its piston rod 42 as by a ~7 threaded connection 52. :
~8 Guide block 40 is counterbored as at 54 to form a radially inwardly projecting shoulder 56 which, with bore 54, ~0 provides a seat for receiving flange 50 of pusher block 38.
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1 A tapered bore 58 flaring outwardly from counterbore 54 tapers 2 from a maximum diameter slighly greater than the outer diam-3 eter of liner 14 to a minimum diameter just slightly greater 4 than the diameter of flange 50. As best seen in Figure 5, when pusher member 38 is seated in guide block 40, tapered
6 bore 58 in guide block 40 and the peripheral surface of main
7 body portion 48 of the pusher member 38 define an annular
8 groove which receives the end of liner 14, the tapered wall
9 of bore 58 slightly compressing or crimping the outer diam-eter of liner 14. Pusher block 40 is threadedly secured to 11 the end of its piston rod 44.
12 Piston rod 42 is telescopically received within 13 piston rod 44, as is shown in Figure 6. A piston head 60 14 fixedly secured to piston rod 42 is slidably received within a chamber 62 formed in a piston head 64 integrally connected 16 to piston rod 44. Piston head 64 in turn is slidably received 17 within cylinder 66 and suitable pressure fluid sources Pl and 18 P2 are respectively connected to the head and rod end of 19 cylinder 66. Fluid pressure supplied from source Pl is ap-plied to the right-hand end (as viewed in Figure 6) of piston 21 64 and is balanced across piston head 60 by passage 68 through 22 piston head 60. Fluid pressure source P2 supplies a rela-23 tively low counter-pressure which normally functions to main-~4 tain piston 60 at its right-hand end lim~t of travel relative to piston 64, in which pusher member 38 is seated in guide ~6 block 40 as shown in Figure 5. Pressure from source ~2 is .
~7 applied against the left-hand side of piston head 64 directly ~8 and communicates with the left-hand side of piston head 60 2~ via a restricted passage 70. :-The pusher assembly as shown in Figure 6 is located ' . -8-- , . . .................. -. --~.,., ~:
. :. .. :. : . . . i -11)76~Z8 1 ¦ in coaxial alignment with the hollow shaft 12 into which the 2 ¦ tube is to be inserted at the comm~encement of the inserting 3 ¦ operation.
4 ¦ To insert a liner 14 into tube 12, both pistons 64 5 ¦ and 60 are located at their extreme right-hand end limits of 3 ¦ movement with pusher member 38 seated in block 40. Pressure 7 ¦ sources Pl and P2 are provided with appropriate valving of 8 ¦ conventional arrangement to enable appropriate actuation of 8 1 the pistons. Location of the pistons at their extreme right-
12 Piston rod 42 is telescopically received within 13 piston rod 44, as is shown in Figure 6. A piston head 60 14 fixedly secured to piston rod 42 is slidably received within a chamber 62 formed in a piston head 64 integrally connected 16 to piston rod 44. Piston head 64 in turn is slidably received 17 within cylinder 66 and suitable pressure fluid sources Pl and 18 P2 are respectively connected to the head and rod end of 19 cylinder 66. Fluid pressure supplied from source Pl is ap-plied to the right-hand end (as viewed in Figure 6) of piston 21 64 and is balanced across piston head 60 by passage 68 through 22 piston head 60. Fluid pressure source P2 supplies a rela-23 tively low counter-pressure which normally functions to main-~4 tain piston 60 at its right-hand end lim~t of travel relative to piston 64, in which pusher member 38 is seated in guide ~6 block 40 as shown in Figure 5. Pressure from source ~2 is .
~7 applied against the left-hand side of piston head 64 directly ~8 and communicates with the left-hand side of piston head 60 2~ via a restricted passage 70. :-The pusher assembly as shown in Figure 6 is located ' . -8-- , . . .................. -. --~.,., ~:
. :. .. :. : . . . i -11)76~Z8 1 ¦ in coaxial alignment with the hollow shaft 12 into which the 2 ¦ tube is to be inserted at the comm~encement of the inserting 3 ¦ operation.
4 ¦ To insert a liner 14 into tube 12, both pistons 64 5 ¦ and 60 are located at their extreme right-hand end limits of 3 ¦ movement with pusher member 38 seated in block 40. Pressure 7 ¦ sources Pl and P2 are provided with appropriate valving of 8 ¦ conventional arrangement to enable appropriate actuation of 8 1 the pistons. Location of the pistons at their extreme right-
10 ¦ hand end limit of movement is accomplished by venting the
11 ¦ head end of cylinder 66 while applying pressure from source
12 ¦ P2. A liner 14 to be inserted is then located with one end
13 ¦ seated upon pusher member 38 and guide block 40 as shown in
14 ¦ Figure 5 and with its opposite end spaced slightly outwardly ~-
15 ¦ from and in coaxial alignment with a sizing ring 30 seated 1~ ¦ upon a propeller shaft 12. The rod end of cylinder 66 is then 17 ¦ vented and pressure from source Pl drives both pistons to the ,~
18 ¦ left as viewed in Figure 6 to drive the liner 14 through 19 ¦ sizing ring 30 into the interior of shaft 12, the frictional 20 ¦ resistance between the sizing ring and liner maintaining 21 ¦ piston 60 at its right-hand end limit of travel during this 22 ¦ stroke.
23 ¦ When liner 14 has been pushed into shaft 12 to the ~4 ¦ point where guide block 40 engages sizing ring 30, guide 25 ¦ block 40 halts, but pusher member 38 continues to move for- -~6 ¦ wardly, pushing liner 14 before it. Pusher member 38 advances ~7 ¦ through sizing ring 30 and into the interior of shaft 12 to ~8 ¦ a distance precletermined by the stroke of piston 60. Pistons 3~ ¦ 60 and 64 are then returned to their original position. `
While various embodiments of the invention have been _g_ ~.' 10'i~6828 1 described, it will be apparent to those skilled in the art 2 that the disclosed embodiments may be modified. Therefore, 3 the foregoing description is to be considered exemplary rather 4 than limiting and the true scope o:E the invention is that ~ fined in the fol1owing claims.
18 ¦ left as viewed in Figure 6 to drive the liner 14 through 19 ¦ sizing ring 30 into the interior of shaft 12, the frictional 20 ¦ resistance between the sizing ring and liner maintaining 21 ¦ piston 60 at its right-hand end limit of travel during this 22 ¦ stroke.
23 ¦ When liner 14 has been pushed into shaft 12 to the ~4 ¦ point where guide block 40 engages sizing ring 30, guide 25 ¦ block 40 halts, but pusher member 38 continues to move for- -~6 ¦ wardly, pushing liner 14 before it. Pusher member 38 advances ~7 ¦ through sizing ring 30 and into the interior of shaft 12 to ~8 ¦ a distance precletermined by the stroke of piston 60. Pistons 3~ ¦ 60 and 64 are then returned to their original position. `
While various embodiments of the invention have been _g_ ~.' 10'i~6828 1 described, it will be apparent to those skilled in the art 2 that the disclosed embodiments may be modified. Therefore, 3 the foregoing description is to be considered exemplary rather 4 than limiting and the true scope o:E the invention is that ~ fined in the fol1owing claims.
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Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A liner for a hollow, cylindrical member having a bore of predetermined diameter, said liner comprising a tube of substantially uniform wall thickness having an outside dia-meter greater than that of said bore, the entire cross-section of the wall of said tube being radially deformed to provide a plurality of longitudinally extending, circumferentially spaced, concavo-convex grooves which enable a resiliently resisted, radial compression of said tube at said grooves to a lesser outside diameter sufficient to permit insertion of said tube in said bore.
2. A liner according to claim 1 wherein said tube is formed of wound sheet material and said grooves extend across the convolutions of said material.
3. A liner according to claim 2 wherein said grooves extend helically of the axis of said tube and are of a pitch opposite to that of said convolutions.
4. A liner according to claim 1 wherein the material from which said liner is formed is paper.
5. A liner according to claim 1 wherein said tube has at least three of said grooves therein.
6.. A liner according to claim 5 wherein the spacing be-tween adjacent grooves is uniform.
7. A liner according to claim 1 wherein each of said grooves extends the full length of said tube.
8. A liner according to claim 1 wherein each of said grooves is parallel to the longitudinal axis of said tube.
9. A liner according to claim 1 wherein said grooves extend helically of said tube axis.
10. A liner according to claim 1 wherein said grooves are of a uniform width in their circumferential extent.
11. A liner according to claim 8 wherein the circumfer-ential width of a groove is less than the circumferential spacing between adjacent grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA270,972A CA1076828A (en) | 1977-02-03 | 1977-02-03 | Propeller shaft liner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA270,972A CA1076828A (en) | 1977-02-03 | 1977-02-03 | Propeller shaft liner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1076828A true CA1076828A (en) | 1980-05-06 |
Family
ID=4107857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA270,972A Expired CA1076828A (en) | 1977-02-03 | 1977-02-03 | Propeller shaft liner |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1076828A (en) |
-
1977
- 1977-02-03 CA CA270,972A patent/CA1076828A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |