CA1113228A - Portable hydraulic gear pulling device - Google Patents
Portable hydraulic gear pulling deviceInfo
- Publication number
- CA1113228A CA1113228A CA340,972A CA340972A CA1113228A CA 1113228 A CA1113228 A CA 1113228A CA 340972 A CA340972 A CA 340972A CA 1113228 A CA1113228 A CA 1113228A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- bore
- chambers
- piston
- fluid
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
- B25B27/026—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same fluid driven
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A fluid gear or like pulling device comprising a body having a through axial bore adapted to admit a shaft; opposed piston chambers extending radially of said bore; pistons in said piston chambers and having a free end adapted to enter into said through bore; means for pressurizing said piston chambers with fluid to force said piston outwardly of their chambers and into said through bore; a press ram mounted in said body for movement axially thereof; and means for moving said press ram axially of said body, the body is sleeve shaped and the piston chambers extend through the sleeve shaped body from outside to inside, the outer end of the piston chambers being formed by the inner side of a ring that extends around the out-side of the body.
A fluid gear or like pulling device comprising a body having a through axial bore adapted to admit a shaft; opposed piston chambers extending radially of said bore; pistons in said piston chambers and having a free end adapted to enter into said through bore; means for pressurizing said piston chambers with fluid to force said piston outwardly of their chambers and into said through bore; a press ram mounted in said body for movement axially thereof; and means for moving said press ram axially of said body, the body is sleeve shaped and the piston chambers extend through the sleeve shaped body from outside to inside, the outer end of the piston chambers being formed by the inner side of a ring that extends around the out-side of the body.
Description
2~
'lai~ invention relates to a portable hy~raulic ~ear or like pullincJ ~levice.
Portabl~ devices of the general nature of this invention are not hroadly new. It is common practice to provide a gear or lik~ pulling device that can be locked agains-t movemlent axially of a shaft and which, when so locked, is capable of exerting a pulling or pushing force with resect to a gear, pulley, sprocket bearing or the li~e for the purpose of either removing it from a shaft or pressing it onto a sha~t. Portability in these devices is important because if one can remove a gear without removing the shaft upon which it is mountad from the piece of machinery in the field, considerable time and expense can be saved over and above a procedure where removal of the shaft from the machinery ~nd transport of the shaft to a machine shop is necessary for the purpose of removiny the year.
With some portable devices of the prior art the pulling or pushing pressure has been hydraulically applied.
This invention contemplates the use of hydraulic power for the pulling and/or pushing operation. There is nothing new in this use of hydraulic power and applicant acknowledges this particular aspect of the device to be old.
; With the portable devices of the prior art, however, the device is mounted on the shaft against movement axially of the shaft by means of a threaded engagement with the shaft.
There are many instances where it is not possible to achieve a threaded engagement of the device with the shaft because the shaft cannot be conveniently threaded or the shaft is not threaded. Even in those cases where threading is possible, the effectiveness of these devices is restricted because the 2~B
location of tlle d2vice a~ially of tlle shaft must be restricted to t;l~ locatioll oE the threading tha-t has been a~L~lied for t.l~ L~urpose.
T~lis invention overcomes the difficulties oE the portable ~evices of t'e prior art in resgect of the mounting of the device on tile shaft. ~ith this invention, it is possible to mount the device on most shafts in a range of locations that greatly increase the effectiveness of the device and that make it unnecessary in practically all lQ cases to remove the shaft from the machine for the purpose of pulling a gear or applying a yPar. In some cases, the use of the invention will save three days in downtime of a large machine wh~re it has been previously necessary to remove the shaft from the machine and take it to a machine snop to remove a gear.
A hydraulic gear pulling device according to this invention comprises a fluid gear or like pulling device which comprises a body having a through axial bore adapted to admit a shaft, opposed piston chambers extending radially of said bore, pistons in said piston chambers and having a free end adapted to enter into said through bore, means for pressuriz-ing said piston chambers with fluid to force said pistons outwardly of their chambers and into said through bore, a press ram mounted in said body for movement axially thereof and means for moving said press ram axially of said body.
The invention will be clearly understood after reference to the following detailed specification read in conjunction with the drawings.
In the drawings;
E`iyure 1 is a ~erspective il]ustration of a Ay~raulic year L-uIlin(J c~evice according -to this invention;
Fi~ure 2 is a plan view of the device o f Figure 1;
I'i~ure 3 is a sectional vie~ alony tlle line 3-3 of E'igure 2;
Figure 4 is a sectional vicw alony ~he line 4-4 of Figure 2; and Fiyure S is a sectional view illustrating the use of adapters for u,ing the device on a smaller shaf-t.
The ~mbodiment of the invention illustrated in the drawings has a body 10 of annular configuration. 't'here are four cylinder chamb2rs 12 in one end of the body that extend radially of the ~ody. Each radially extending cylinder opening has a piston 14 moun-ted therein. Numerals 16 refer to piston seals.
The inner seals of the cylinder chambers 12 col~nunicate with each other hydraulically through a circum-ferentially extending channel 18 in the circumferentially extending collar 20. A snap ring 22 holds collar 20 in ~lace and seals 24 ensure hydraulic sealing. An opening 26 in the collar is designed to admit a fitting 27 for the a~mission of hydraulic fluid to the chambers 12 in use as will be explained later.
A press ram of annular cross section 28 is adapted to move axially of the casing 10 within a press ram chamber formed in the end of the casing. Seals 30 seal the press ram 28 with the walls of its chamber. At the bottom end of the axially extending chamber, an inlet port for hydraulic fluid 34 extends through the casing to the bottom of the ram.
In use, hydraulic fluid is admitted to th~ inlet port 34 -.. ' ':: , ' ' .
' sn~ is s~ )lie(l to tlle ~.o~tom end of the ram 23. ~ fitting for adl~littin(J hy~raulic fluid under pressure is secured to ~ne inlet ope~lin~ 3-~.
l~ rin~; 35 on the free end of the ra~l 2~ has dia-m~trically o~ )osed lugs 3~ WlliCa connect with si~rings 40.
Sl~rings 40 connect at their opposite ends to luys 42 which ar2 mounted on the casing 10. Springs 40 are in tension and desiyned to retuxn the ram 28 to its inward position illustrated in Figure 3 when the pressure in the ram chamber is released.
A mark (not shown) on the ram 28 -that i5 visible to an operator indicates when the ram has been extended its intended travel. Alternatively, a stop mPmber could be used to limit outer travel ofthe ram or limiting the amount of hydraulic fluid admitted to the ram chamber could be used to limit travel.
In use, a hydraulic hose capable of delivering a hydraulic fluid under pressure is connected to each of the fittings 26 and 35. The body is slipped over a gear or like shaft so that the shaft extends through the opening in the body. Hydraulic fluid under pressure is, then, ~upplied through fitting 26 to the header 18 ~o pressurize the inner ends of the radially extending pistons 14. These pistons are in opposed relation to each other and move inwardly to engage and grip the shaft. In the embodiment of the invention illustrated, pistons 14 have a diameter of about 2 inches and are capable of developing a holding power on the shaft in excess of 60 ton~ with a hydraulic pressure of about 10,000 pounds per square inch. When the pistons have been actuated against ~le shaft to grip it the supply line to .. . .
:, ' ' , -:
.
z~
tne header 1~ i~ closed and t~le device i~; in firm gripping arrancJement on the silaft.
The axially extenr.~ing press ram 28 i " at t'liS ~tage, fully retracted under the action of springs 40 and in the posit:ion of Figure 3. The device has been located on the shaft wi.th the annular ring 36 in abutting relation with a gear or tlle like WhiCIl i5 to be moved in a position away from the body of the device in an axial direction. Hydraulic fluid under pressure is, then, supplied through the filling 35 and port opening 34 to the lower end of the press ram 28 to move it outwardly. The pressure developed by fluid supplied to the press ram 28 is exerted against the rear to move it with respect to the shaft and away fromthe body 10 of the device which is rigid with respect to the shaft.
The amount of pressure supplied depends upon the pressure of the hydraulic fluid supplied to the unit and the area of the press ram 28. Sufficient pressure is applied up to the holding force of the radially extending pistons to do the job required. This is a matter of design but with the unit illustrated, there is no difficulty in achieving a press of 60 tons.
It will be apparent that the force applied to the axially extending ram must be within the holding pow~r of the radially extending pistons and that variation can be achieved by either design of piston cross sections or hydraulic pressures applied to the device.
The device is used in accordance with general puller technique. In some cases, the free end of ring 36 is not applied directly against the gear to be removed, but rather the device is applied to the shaft in a direction such that 2.~
the r~lovernent o~ tlle ~ress ram 2~ is away from the year to ~e removed. ~ e geax is connected to the plate 36 by means of puller rods an~ a pu]ler plate. The desiyn of puller rods and puller ~1a-tes is very well l~;no~n and not discussed in this ,api~lica~ion. Suffice it to say that it is intended tnat the clevice be used in àccordance with standard practice in respect of puller rods and puller plates.
One feature of the device that is thouyht to be worthy of special mention is t~le ease and the flexibility 13 with which the device can be connected onto a shaft. It can be quickly mounted by the application of hydraulic pressure as just indicated and, just as quickly released by releasing the hydraulic pressure. The stroke of the presser ram 28 may be relatively small but the device can be quickly mounted on a shaft, the ram operated to move the gear to the limit of the extent of its travel; the pressure relieved in the axial direction; the device relieved from the shaft by relieving the pressure Oll the radially extending pistons;
the device moved along the shaft an increment substantially equal to the travel of the piston; clamped again to the shaft and; then operated to move the axially extendiny piston 28 ayain for its full extent.
By incremental movement in this wa~, it is possible to achieve a long pull on a gear or the like with speed and ease because the device can be mounted easily in any loca-tion with a minimum of effort.
The devices of the prior art where the device had to be secured ~D a shaft by threading have an inherent limitation in respect of the location of the device due to the location of the threads upon which the device must be mounted.
. ' ~ .
'l'nc clevice can 'je ada~ted for use with different sii:e sl~afts by usinc3 sleeve ada,-~ters within t'~e oL~enincJ of tlle ~ody 13. '~ne sleeve adai~ters com~)rise a i-~air of split sleeve sections 37 d2sic~ned to fit inside the bore of body 13 and to loose]y e~brace a shaf-t 30 of smaller bore with which it is clesired to use the device. In use, the griL~ping ~ower of piston l~ is transferred to a smaller shaf t, as illustrated in Figure 5.
2~ :
, ,: , . :
.
.: . ~ - . : ~.
'lai~ invention relates to a portable hy~raulic ~ear or like pullincJ ~levice.
Portabl~ devices of the general nature of this invention are not hroadly new. It is common practice to provide a gear or lik~ pulling device that can be locked agains-t movemlent axially of a shaft and which, when so locked, is capable of exerting a pulling or pushing force with resect to a gear, pulley, sprocket bearing or the li~e for the purpose of either removing it from a shaft or pressing it onto a sha~t. Portability in these devices is important because if one can remove a gear without removing the shaft upon which it is mountad from the piece of machinery in the field, considerable time and expense can be saved over and above a procedure where removal of the shaft from the machinery ~nd transport of the shaft to a machine shop is necessary for the purpose of removiny the year.
With some portable devices of the prior art the pulling or pushing pressure has been hydraulically applied.
This invention contemplates the use of hydraulic power for the pulling and/or pushing operation. There is nothing new in this use of hydraulic power and applicant acknowledges this particular aspect of the device to be old.
; With the portable devices of the prior art, however, the device is mounted on the shaft against movement axially of the shaft by means of a threaded engagement with the shaft.
There are many instances where it is not possible to achieve a threaded engagement of the device with the shaft because the shaft cannot be conveniently threaded or the shaft is not threaded. Even in those cases where threading is possible, the effectiveness of these devices is restricted because the 2~B
location of tlle d2vice a~ially of tlle shaft must be restricted to t;l~ locatioll oE the threading tha-t has been a~L~lied for t.l~ L~urpose.
T~lis invention overcomes the difficulties oE the portable ~evices of t'e prior art in resgect of the mounting of the device on tile shaft. ~ith this invention, it is possible to mount the device on most shafts in a range of locations that greatly increase the effectiveness of the device and that make it unnecessary in practically all lQ cases to remove the shaft from the machine for the purpose of pulling a gear or applying a yPar. In some cases, the use of the invention will save three days in downtime of a large machine wh~re it has been previously necessary to remove the shaft from the machine and take it to a machine snop to remove a gear.
A hydraulic gear pulling device according to this invention comprises a fluid gear or like pulling device which comprises a body having a through axial bore adapted to admit a shaft, opposed piston chambers extending radially of said bore, pistons in said piston chambers and having a free end adapted to enter into said through bore, means for pressuriz-ing said piston chambers with fluid to force said pistons outwardly of their chambers and into said through bore, a press ram mounted in said body for movement axially thereof and means for moving said press ram axially of said body.
The invention will be clearly understood after reference to the following detailed specification read in conjunction with the drawings.
In the drawings;
E`iyure 1 is a ~erspective il]ustration of a Ay~raulic year L-uIlin(J c~evice according -to this invention;
Fi~ure 2 is a plan view of the device o f Figure 1;
I'i~ure 3 is a sectional vie~ alony tlle line 3-3 of E'igure 2;
Figure 4 is a sectional vicw alony ~he line 4-4 of Figure 2; and Fiyure S is a sectional view illustrating the use of adapters for u,ing the device on a smaller shaf-t.
The ~mbodiment of the invention illustrated in the drawings has a body 10 of annular configuration. 't'here are four cylinder chamb2rs 12 in one end of the body that extend radially of the ~ody. Each radially extending cylinder opening has a piston 14 moun-ted therein. Numerals 16 refer to piston seals.
The inner seals of the cylinder chambers 12 col~nunicate with each other hydraulically through a circum-ferentially extending channel 18 in the circumferentially extending collar 20. A snap ring 22 holds collar 20 in ~lace and seals 24 ensure hydraulic sealing. An opening 26 in the collar is designed to admit a fitting 27 for the a~mission of hydraulic fluid to the chambers 12 in use as will be explained later.
A press ram of annular cross section 28 is adapted to move axially of the casing 10 within a press ram chamber formed in the end of the casing. Seals 30 seal the press ram 28 with the walls of its chamber. At the bottom end of the axially extending chamber, an inlet port for hydraulic fluid 34 extends through the casing to the bottom of the ram.
In use, hydraulic fluid is admitted to th~ inlet port 34 -.. ' ':: , ' ' .
' sn~ is s~ )lie(l to tlle ~.o~tom end of the ram 23. ~ fitting for adl~littin(J hy~raulic fluid under pressure is secured to ~ne inlet ope~lin~ 3-~.
l~ rin~; 35 on the free end of the ra~l 2~ has dia-m~trically o~ )osed lugs 3~ WlliCa connect with si~rings 40.
Sl~rings 40 connect at their opposite ends to luys 42 which ar2 mounted on the casing 10. Springs 40 are in tension and desiyned to retuxn the ram 28 to its inward position illustrated in Figure 3 when the pressure in the ram chamber is released.
A mark (not shown) on the ram 28 -that i5 visible to an operator indicates when the ram has been extended its intended travel. Alternatively, a stop mPmber could be used to limit outer travel ofthe ram or limiting the amount of hydraulic fluid admitted to the ram chamber could be used to limit travel.
In use, a hydraulic hose capable of delivering a hydraulic fluid under pressure is connected to each of the fittings 26 and 35. The body is slipped over a gear or like shaft so that the shaft extends through the opening in the body. Hydraulic fluid under pressure is, then, ~upplied through fitting 26 to the header 18 ~o pressurize the inner ends of the radially extending pistons 14. These pistons are in opposed relation to each other and move inwardly to engage and grip the shaft. In the embodiment of the invention illustrated, pistons 14 have a diameter of about 2 inches and are capable of developing a holding power on the shaft in excess of 60 ton~ with a hydraulic pressure of about 10,000 pounds per square inch. When the pistons have been actuated against ~le shaft to grip it the supply line to .. . .
:, ' ' , -:
.
z~
tne header 1~ i~ closed and t~le device i~; in firm gripping arrancJement on the silaft.
The axially extenr.~ing press ram 28 i " at t'liS ~tage, fully retracted under the action of springs 40 and in the posit:ion of Figure 3. The device has been located on the shaft wi.th the annular ring 36 in abutting relation with a gear or tlle like WhiCIl i5 to be moved in a position away from the body of the device in an axial direction. Hydraulic fluid under pressure is, then, supplied through the filling 35 and port opening 34 to the lower end of the press ram 28 to move it outwardly. The pressure developed by fluid supplied to the press ram 28 is exerted against the rear to move it with respect to the shaft and away fromthe body 10 of the device which is rigid with respect to the shaft.
The amount of pressure supplied depends upon the pressure of the hydraulic fluid supplied to the unit and the area of the press ram 28. Sufficient pressure is applied up to the holding force of the radially extending pistons to do the job required. This is a matter of design but with the unit illustrated, there is no difficulty in achieving a press of 60 tons.
It will be apparent that the force applied to the axially extending ram must be within the holding pow~r of the radially extending pistons and that variation can be achieved by either design of piston cross sections or hydraulic pressures applied to the device.
The device is used in accordance with general puller technique. In some cases, the free end of ring 36 is not applied directly against the gear to be removed, but rather the device is applied to the shaft in a direction such that 2.~
the r~lovernent o~ tlle ~ress ram 2~ is away from the year to ~e removed. ~ e geax is connected to the plate 36 by means of puller rods an~ a pu]ler plate. The desiyn of puller rods and puller ~1a-tes is very well l~;no~n and not discussed in this ,api~lica~ion. Suffice it to say that it is intended tnat the clevice be used in àccordance with standard practice in respect of puller rods and puller plates.
One feature of the device that is thouyht to be worthy of special mention is t~le ease and the flexibility 13 with which the device can be connected onto a shaft. It can be quickly mounted by the application of hydraulic pressure as just indicated and, just as quickly released by releasing the hydraulic pressure. The stroke of the presser ram 28 may be relatively small but the device can be quickly mounted on a shaft, the ram operated to move the gear to the limit of the extent of its travel; the pressure relieved in the axial direction; the device relieved from the shaft by relieving the pressure Oll the radially extending pistons;
the device moved along the shaft an increment substantially equal to the travel of the piston; clamped again to the shaft and; then operated to move the axially extendiny piston 28 ayain for its full extent.
By incremental movement in this wa~, it is possible to achieve a long pull on a gear or the like with speed and ease because the device can be mounted easily in any loca-tion with a minimum of effort.
The devices of the prior art where the device had to be secured ~D a shaft by threading have an inherent limitation in respect of the location of the device due to the location of the threads upon which the device must be mounted.
. ' ~ .
'l'nc clevice can 'je ada~ted for use with different sii:e sl~afts by usinc3 sleeve ada,-~ters within t'~e oL~enincJ of tlle ~ody 13. '~ne sleeve adai~ters com~)rise a i-~air of split sleeve sections 37 d2sic~ned to fit inside the bore of body 13 and to loose]y e~brace a shaf-t 30 of smaller bore with which it is clesired to use the device. In use, the griL~ping ~ower of piston l~ is transferred to a smaller shaf t, as illustrated in Figure 5.
2~ :
, ,: , . :
.
.: . ~ - . : ~.
Claims (2)
1. A fluid gear or like pulling device comprising:
a body having a through axial bore adapted to admit a shaft;
opposed piston chambers extending radially of said bore;
pistons in said piston chambers and having a free end adapted to enter into said through bore;
means for pressurizing said piston chambers with fluid to force said piston outwardly of their chambers and into said through bore;
a press ram mounted in said body for movement axially thereof;
and means for moving said press ram axially of said body, said body being sleeve shaped, said piston chambers extend-ing through said sleeve shaped body from outside to inside, the outer end of said chambers being formed by the inner side of a ring that extends around the outside of said body.
a body having a through axial bore adapted to admit a shaft;
opposed piston chambers extending radially of said bore;
pistons in said piston chambers and having a free end adapted to enter into said through bore;
means for pressurizing said piston chambers with fluid to force said piston outwardly of their chambers and into said through bore;
a press ram mounted in said body for movement axially thereof;
and means for moving said press ram axially of said body, said body being sleeve shaped, said piston chambers extend-ing through said sleeve shaped body from outside to inside, the outer end of said chambers being formed by the inner side of a ring that extends around the outside of said body.
2. A fluid gear or like pulling device as claimed in Claim 1 in which the fluid is a hydraulic fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA340,972A CA1113228A (en) | 1979-11-30 | 1979-11-30 | Portable hydraulic gear pulling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA340,972A CA1113228A (en) | 1979-11-30 | 1979-11-30 | Portable hydraulic gear pulling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1113228A true CA1113228A (en) | 1981-12-01 |
Family
ID=4115723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA340,972A Expired CA1113228A (en) | 1979-11-30 | 1979-11-30 | Portable hydraulic gear pulling device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1113228A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0212080A2 (en) * | 1985-08-16 | 1987-03-04 | Rockwell International Corporation | Apparatus for extracting an element from an assembly |
| EP0280649A1 (en) * | 1987-02-19 | 1988-08-31 | Abnox AG | Tool for generating an axially directed force |
-
1979
- 1979-11-30 CA CA340,972A patent/CA1113228A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0212080A2 (en) * | 1985-08-16 | 1987-03-04 | Rockwell International Corporation | Apparatus for extracting an element from an assembly |
| EP0212080A3 (en) * | 1985-08-16 | 1989-02-22 | Rockwell International Corporation | Apparatus for extracting an element from an assembly |
| EP0280649A1 (en) * | 1987-02-19 | 1988-08-31 | Abnox AG | Tool for generating an axially directed force |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |