CA1307934C - Modular yoke end - Google Patents
Modular yoke endInfo
- Publication number
- CA1307934C CA1307934C CA000575961A CA575961A CA1307934C CA 1307934 C CA1307934 C CA 1307934C CA 000575961 A CA000575961 A CA 000575961A CA 575961 A CA575961 A CA 575961A CA 1307934 C CA1307934 C CA 1307934C
- Authority
- CA
- Canada
- Prior art keywords
- yoke
- shaft
- splined
- connection end
- drive assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000013011 mating Effects 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 9
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 13
- 239000000565 sealant Substances 0.000 claims description 10
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 2
- 239000010962 carbon steel Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 238000005242 forging Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- SULYQGVAYSECAW-ZEQRLZLVSA-N ethyl (2s)-2-[[(2s)-2-acetamido-3-[4-[bis(2-chloroethyl)amino]phenyl]propanoyl]amino]-3-(4-hydroxyphenyl)propanoate Chemical compound C([C@@H](C(=O)OCC)NC(=O)[C@H](CC=1C=CC(=CC=1)N(CCCl)CCCl)NC(C)=O)C1=CC=C(O)C=C1 SULYQGVAYSECAW-ZEQRLZLVSA-N 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
Abstract
Title Modular Yoke End Abstract of the Invention A modular power drive assembly includes a plain carbon driving shaft having an externally splined connection end, and a cast iron yoke having a hub thereon in fixed engagement with said connecting end of the shaft. In a preferred form, the hub includes an internally splined mating portion for fixed torsional securement to the externally splined connection end of the shaft.
The splined portions are sized to be press-fitted together to provide an interference fit between the splined members. A
bonding adhesive is applied between the mating splined portions, and the yoke and shaft members are thereby fixedly secured against axial and rotational movement with respect to one another.
The splined portions are sized to be press-fitted together to provide an interference fit between the splined members. A
bonding adhesive is applied between the mating splined portions, and the yoke and shaft members are thereby fixedly secured against axial and rotational movement with respect to one another.
Description
-` ~3~7934 Title Modular Yoke End - Background of the Invention This invention rela~es to power transmission assemblies of - the type including yokes splinedL to shafts for applications in vehicular drive systems. More parti~ularly, ~he invention rel~tes to retention of su~h yokes on such shafts for purposes of insuring rigid securement of the yokes against axial and rotational relative movement with respect ~o the shafts.
.
Prior art drive assemblies involving metallic driving shafts and yokes secured thereto have primarily involved the use of forged yokes in the automotive industry. Typically, a forged steel yoke is inextia welded (friction welded) to a shaft made of plain carbon steel. As is known in the art, forging and welding processes are relatively expensive compared to variou.s other alternative procedures.
`., ~ I Summary of the Invention .
This invention provides ~ power drive assembly includiny a driving shaft having an externally splined connec~ion end, and a non-forged yoke having an annular hub adapted for xigid securement to the connection end of the sha~t.
The drive assembl~ of the presPnt invention avoids the cos~ly procedures of the prior ar~ by eliminating forging and welding operations. A cast iron yoke is formed by broaching .. ... . . . ..
-, 1 ^
' : .. . .
,:; ,.,::
, .
:: . .
.....
3~793~
splines into a cast iron blank. The resultant member is considerably less expensive than a forged yoke. The splines of the yoke and shaft members are bonded together with a super-adhesive. In a preferred form, an anaerobic sealant is employed in the bonding process, which provides a strength of at least three (3) thousand pounds per square inch. The process results in substantial savings without a sacrifice in integrity of the assembly.
'' ` Brief Description of the Drawing Figure 1 is a side view of a power drive assembly constructed in accordance with the present invention, depicted partially in cross-section.
Figure 2 is a partial side view of the connection end of the ~ power drive assembly during fabrication~
- ~igure 3 is a view along lines 3-3 of Figure 2.
Detailed Description of a Preferred EmSodiment .
Referring to the drawin~ figures, a vehicular power drive assembly 10 includes a plain carbon steel driving shaft 12 and a yoke 14 which is fabricated of ~ast iron. The driving shaft 12 includes a connection end 16 adapted for being coupled with and for the support of the yoke 14. The connection end 16 includes an ex~ernally splined surface portion 18. For purposes of , :
.
~3~93g coupling the yoke to the shaft 12, the yoke 14 includes an internally splined portion 200 matingly sized and adapted to be securely installed over the externally splined surface portion 18 under a one plus or minus one ~l~1) thousandth of an inch press-fit tolerance to form a suitable interference fit.
The yoke 14 contains an annulus or hub 22 which includes the mating internally splined port~on 20 for rotational securement to the connection end 16 of the shaft 12. Extending from the hub 22 are a pair of yoke ears 24, which permit coupling to a vehicular wheel end, by means of a pair of cross holes 28, as will be appreciated by those skilled in this art.
A superior adhesive bond is provided via the use of an anaerobic ~ealant, which forms a relatively high strength adhesive for metallic members. In the preferred embodiment of the present invention, the sealant is applied in a region 30 defined by the interen~aging splined portions 20 and 18 of th~
respective yoke and shaft members. One preferred sealant, "Permabond HH040", manufactured and sold by National starch and Chemical Corporation, is capable of carrying a shear loading of at least three thousand pounds per square inch. The latter nontoxic anaerobic sealant hardens upon exclusion of air, which will naturally occur upon assembly together of the parts to be mated. To the extent that the splines will handle the torsional loading, the anerobic bond will be subjected primarily to axial forces between yoke and shaft, and will tend to fail in a shear mode. Hence, the load rating is in "shear" rather than an ~L3~93~
"axial" force rating.
A preferred process of manufacture incorporates ~he steps of forming a cast iron blank, and broaching splines into the blank to form a splined yoke member 14. Matingly sized splines in the connection end 16 of the shaft 12 are rolled by a conventional process. The yoke is preferably made of a non-heat treated cast iron to avoid the forging process, while the shaft is preferably constructed of a heat treated plain carbon steel. A bead of anaerobic sealant is applied to the connection end of the shaft at the outermost edge 26 of the splined portion 18. Next, installation of the yoke 14 over the splined portion 18 of ~he shaft will cause ~he sealant ~o spread out over the splined interface region 30 of the interengaging splined yoke and shaft portions. Finally, a curing period is provided in order to permit the bonding adhesive to satisfactorily set up. A range of three to five minutes is required for physical hardening or setting of the sealant, while a curing period of up to twenty-four hours (24) is recommended prior to any application of torque.
Referring now ~pecifically to F gures 2 and 3, an as~embly fixture 40 may be used to facilitate fa~rication of the modular yoke end. The assembly 40 is comprised of a spacer ring 42, and a tooling pin 44 capable of extension through an aperture 48, the aperture defining the center of the ring 42. In the preferred embodiment, for convenience, the pin 44 includes a knurled handle 46, as shown in Figure 2. Use of the assembly 40 will assure .. ~ . ;~:
' ' . ' ' ' , -, ~
13~7~3~
securement of the yoke 14 at a prefixecl desired location along the splined portion 18 of the connection end 16 of the shaft 12.
A preferred method would include the following steps after placement of a bead of sealant at the outermost edge 26 of the portion 18: -(1) Place and hold the spacer ring 42 between the ears 24 of the yoke 14.
(2) Holding the knurled handle 46, insert the tooling pin44 through the cross holPS 28, and through the aperture 48 of the ring 42.
: ~3) Insert the splined portion 16 of the connection : .end 16 (of the shaft 12) into the mating splinad portion 20 of the yoke 14, until the extremity 34 of the connection end 16 bottoms against the ring 42.
(4) Remove tooling pin and spacer, and allow twenty-four (24) hours prior to application of torque.
Although only one presently preferred embodiment and method of assembly have been shown and described herein, the ~ollowing claims are envisioned to cover numerous other alternatives which will fall within the spirit and scope ~hereof.
;- , ~, .
.. , . ' '- "' ' ' ~ . ' , :
.
Prior art drive assemblies involving metallic driving shafts and yokes secured thereto have primarily involved the use of forged yokes in the automotive industry. Typically, a forged steel yoke is inextia welded (friction welded) to a shaft made of plain carbon steel. As is known in the art, forging and welding processes are relatively expensive compared to variou.s other alternative procedures.
`., ~ I Summary of the Invention .
This invention provides ~ power drive assembly includiny a driving shaft having an externally splined connec~ion end, and a non-forged yoke having an annular hub adapted for xigid securement to the connection end of the sha~t.
The drive assembl~ of the presPnt invention avoids the cos~ly procedures of the prior ar~ by eliminating forging and welding operations. A cast iron yoke is formed by broaching .. ... . . . ..
-, 1 ^
' : .. . .
,:; ,.,::
, .
:: . .
.....
3~793~
splines into a cast iron blank. The resultant member is considerably less expensive than a forged yoke. The splines of the yoke and shaft members are bonded together with a super-adhesive. In a preferred form, an anaerobic sealant is employed in the bonding process, which provides a strength of at least three (3) thousand pounds per square inch. The process results in substantial savings without a sacrifice in integrity of the assembly.
'' ` Brief Description of the Drawing Figure 1 is a side view of a power drive assembly constructed in accordance with the present invention, depicted partially in cross-section.
Figure 2 is a partial side view of the connection end of the ~ power drive assembly during fabrication~
- ~igure 3 is a view along lines 3-3 of Figure 2.
Detailed Description of a Preferred EmSodiment .
Referring to the drawin~ figures, a vehicular power drive assembly 10 includes a plain carbon steel driving shaft 12 and a yoke 14 which is fabricated of ~ast iron. The driving shaft 12 includes a connection end 16 adapted for being coupled with and for the support of the yoke 14. The connection end 16 includes an ex~ernally splined surface portion 18. For purposes of , :
.
~3~93g coupling the yoke to the shaft 12, the yoke 14 includes an internally splined portion 200 matingly sized and adapted to be securely installed over the externally splined surface portion 18 under a one plus or minus one ~l~1) thousandth of an inch press-fit tolerance to form a suitable interference fit.
The yoke 14 contains an annulus or hub 22 which includes the mating internally splined port~on 20 for rotational securement to the connection end 16 of the shaft 12. Extending from the hub 22 are a pair of yoke ears 24, which permit coupling to a vehicular wheel end, by means of a pair of cross holes 28, as will be appreciated by those skilled in this art.
A superior adhesive bond is provided via the use of an anaerobic ~ealant, which forms a relatively high strength adhesive for metallic members. In the preferred embodiment of the present invention, the sealant is applied in a region 30 defined by the interen~aging splined portions 20 and 18 of th~
respective yoke and shaft members. One preferred sealant, "Permabond HH040", manufactured and sold by National starch and Chemical Corporation, is capable of carrying a shear loading of at least three thousand pounds per square inch. The latter nontoxic anaerobic sealant hardens upon exclusion of air, which will naturally occur upon assembly together of the parts to be mated. To the extent that the splines will handle the torsional loading, the anerobic bond will be subjected primarily to axial forces between yoke and shaft, and will tend to fail in a shear mode. Hence, the load rating is in "shear" rather than an ~L3~93~
"axial" force rating.
A preferred process of manufacture incorporates ~he steps of forming a cast iron blank, and broaching splines into the blank to form a splined yoke member 14. Matingly sized splines in the connection end 16 of the shaft 12 are rolled by a conventional process. The yoke is preferably made of a non-heat treated cast iron to avoid the forging process, while the shaft is preferably constructed of a heat treated plain carbon steel. A bead of anaerobic sealant is applied to the connection end of the shaft at the outermost edge 26 of the splined portion 18. Next, installation of the yoke 14 over the splined portion 18 of ~he shaft will cause ~he sealant ~o spread out over the splined interface region 30 of the interengaging splined yoke and shaft portions. Finally, a curing period is provided in order to permit the bonding adhesive to satisfactorily set up. A range of three to five minutes is required for physical hardening or setting of the sealant, while a curing period of up to twenty-four hours (24) is recommended prior to any application of torque.
Referring now ~pecifically to F gures 2 and 3, an as~embly fixture 40 may be used to facilitate fa~rication of the modular yoke end. The assembly 40 is comprised of a spacer ring 42, and a tooling pin 44 capable of extension through an aperture 48, the aperture defining the center of the ring 42. In the preferred embodiment, for convenience, the pin 44 includes a knurled handle 46, as shown in Figure 2. Use of the assembly 40 will assure .. ~ . ;~:
' ' . ' ' ' , -, ~
13~7~3~
securement of the yoke 14 at a prefixecl desired location along the splined portion 18 of the connection end 16 of the shaft 12.
A preferred method would include the following steps after placement of a bead of sealant at the outermost edge 26 of the portion 18: -(1) Place and hold the spacer ring 42 between the ears 24 of the yoke 14.
(2) Holding the knurled handle 46, insert the tooling pin44 through the cross holPS 28, and through the aperture 48 of the ring 42.
: ~3) Insert the splined portion 16 of the connection : .end 16 (of the shaft 12) into the mating splinad portion 20 of the yoke 14, until the extremity 34 of the connection end 16 bottoms against the ring 42.
(4) Remove tooling pin and spacer, and allow twenty-four (24) hours prior to application of torque.
Although only one presently preferred embodiment and method of assembly have been shown and described herein, the ~ollowing claims are envisioned to cover numerous other alternatives which will fall within the spirit and scope ~hereof.
;- , ~, .
.. , . ' '- "' ' ' ~ . ' , :
Claims (10)
1. In a power drive assembly including a metallic driving shaft having an externally splined connection end, a metallic yoke having a hub adapted for securement to said connection end of said shaft, said hub including a mating internally splined portion for torsional securement to said externally splined connection end; an improvement comprising: the combination of (1) an interference fit between said mating splined shaft and yoke portions, and (2) a bonding adhesive applied between said mating portions, whereby said yoke and shaft members are fixedly secured against axial and rotational movement with respect to one another.
2. The drive assembly of claim 1 wherein said yoke is comprised of a non-heat treated cast iron material.
3. The drive assembly of claim 2 wherein said bonding adhesive applied between said mating portions of said yoke and said shaft comprises an anaerobic sealant.
4. The drive assembly of claim 3 wherein upon coupling together said yoke and shaft, said internally splined portion of said hub of said yoke and said externally splined connecting end of said shaft comprises a matingly splined interface defining a press-fit in a tolerance range of one plus or minus one (1+1) thousandths of an inch.
5. The drive assembly of claim 4 wherein said anaerobic sealant bond comprises a capacity to transmit a torsional load between said yoke and shaft members of at least three (3) thousand pounds per square inch.
6. The drive assembly of claim 5 wherein said shaft is formed of a heat treated carbon steel material.
7. The drive assembly of claim 6 wherein said shaft comprises a wheel end driving component.
8. A process of forming a drive assembly which includes a metallic driving shaft having an externally splined connection end, an a metallic yoke having a hub adapted for securement to said connection end of said shaft, said hub including a mating internally splined annulus for torsional securement to said externally splined connection end, said process comprising the steps of (1) forming an external splined portion on one end of a plain carbon steel shaft, (2) forming an internal splined portion in a cast iron yoke adapted to be secured over said connection end of said driving shaft under a press-fit tolerance, (3) applying a bonding adhesive to said splined end of said driving shaft, (4) installing said yoke to said connection end, and (5) providing a curing period for said adhesive prior to application of torsional load to said assembly, said period being no greater than 24 hours.
9. The process of claim 8 wherein said internal splined portion of said yoke is formed by a broaching operation.
10. A power drive assembly including a plain carbon steel driving shaft having an externally splined connection end, a cast iron yoke having a hub adapted for rigid securement to said connection end of said shaft, said hub including a mating internally splined annulus for torsional securement to said externally splined connection end, an interference fit between said mating splined shaft and yoke portions, and a bonding adhesive applied between said mating portions, whereby said yoke and shaft members are fixedly secured against axial and rotational movement with respect to one another.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10222487A | 1987-09-29 | 1987-09-29 | |
| US102,224 | 1987-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1307934C true CA1307934C (en) | 1992-09-29 |
Family
ID=22288778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000575961A Expired - Lifetime CA1307934C (en) | 1987-09-29 | 1988-08-29 | Modular yoke end |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR970001601B1 (en) |
| BR (1) | BR8804720A (en) |
| CA (1) | CA1307934C (en) |
| PH (1) | PH27128A (en) |
-
1988
- 1988-08-29 CA CA000575961A patent/CA1307934C/en not_active Expired - Lifetime
- 1988-09-13 BR BR8804720A patent/BR8804720A/en not_active IP Right Cessation
- 1988-09-21 KR KR1019880012217A patent/KR970001601B1/en not_active IP Right Cessation
- 1988-09-27 PH PH37603A patent/PH27128A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PH27128A (en) | 1993-03-16 |
| KR890005406A (en) | 1989-05-13 |
| KR970001601B1 (en) | 1997-02-11 |
| BR8804720A (en) | 1989-04-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |