CARRIER ASSEMBLY WITH THREADED ADJUSTMENT MEMBER

• US 20120238393A1
• Filed: 03/14/2011
• Published: 09/20/2012
• Est. Priority Date: 03/14/2011
• Status: Active Grant

• Current Assignee: ArvinMeritor Technology LLC (Meritor, Inc. (Nevada))
• Original Assignee: ArvinMeritor Technology LLC (Meritor, Inc. (Nevada))
• Inventors: Martin, Robert J. III
• Granted Patent: US 9,074,677 B2
• Time in Patent Office: Days
• US Class Current: 475/220
• CPC Class Codes: F16C 19/364 with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
• CPC Class Codes: F16C 19/547 with two angular contact rolling bearings
• CPC Class Codes: F16C 23/06 Ball or roller bearings
• CPC Class Codes: F16C 2361/61 Toothed gear systems, e.g. support of pinion shafts in general F16H57/02
• CPC Class Codes: F16C 35/077 between housing and outer race ring
• CPC Class Codes: F16H 57/037 Gearboxes for accommodating differential gearings rotating cases for differential gearings F16H48/40
• CPC Class Codes: F16H 57/0471 Bearing
• CPC Class Codes: F16H 57/0483 Axle or inter-axle differentials
• CPC Class Codes: Y10T 29/49464 Assembling of gear into force transmitting device

Abstract

A carrier assembly includes an adjustment member with a threaded attachment surface that is threadably attached to a mating threaded surface of a housing. The threaded attachment surface is formed on the adjustment member between first and second pilot surfaces, which allows the adjustment member to be selectively rotated to adjust a position of the adjustment member relative to the housing to set a desired carrier characteristic without requiring shims or spacers. The adjustment member also includes a splined outer surface that engages a splined lock member to lock the adjustment member to the housing once the desired carrier characteristic has been set.

Claims

1. A carrier assembly comprising:

a housing;

a cylindrical body having an inner circumferential surface and an outer circumferential surface, said outer circumferential surface having a threaded attachment surface to threadably attach to said housing;

at least one bearing directly engaging said inner circumferential surface;

a first pilot surface formed on said outer circumferential surface and positioned on one side of said threaded attachment surface;

a second pilot surface positioned on an opposite side of said threaded attachment surface, and wherein said cylindrical body is selectively adjustable via said threaded attachment surface to provide a desired carrier characteristic;

a splined surface formed within said outer circumferential surface of said cylindrical body; and

a splined lock member engaging said splined surface once said desired carrier characteristic is achieved to lock said cylindrical body to said housing.

2. The carrier assembly according to claim 1 wherein said splined lock member comprises an arcuate body with a splined inner circumferential surface that directly engages said splined surface of said cylindrical body.

3. The carrier assembly according to claim 2 wherein said splined lock member is directly attached to said housing with at least one fastener.

4. The carrier assembly according to claim 1 wherein said housing comprises a differential case, said desired carrier characteristic comprises a differential bearing preload, and said at least one bearing comprises an output shaft bearing, and wherein said second pilot surface comprises an inner surface of said differential case, and including a differential bearing engaging said second pilot surface wherein an end face of said cylindrical body directly abuts against said differential bearing such that said cylindrical body is rotatable via said threaded attachment surface to adjust said differential bearing preload.

5. The carrier assembly according to claim 1 wherein said housing comprises a carrier shell and said cylindrical body comprises a pinion cage that is attached to said carrier shell, and including

a ring gear positioned within said carrier shell, said ring gear having a plurality of ring gear teeth;

a pinion gear having an inner end and an outer end, said inner end including a plurality of pinion gear teeth in meshing engagement with said plurality of ring gear teeth,

wherein said at least one bearing comprises a first pinion gear bearing positioned adjacent said inner end and a second pinion gear bearing axially spaced from said first pinion gear bearing in a direction toward said outer end, said first and second pinion gear bearings rotatably supporting said pinion gear for rotation relative to said pinion cage,

wherein said second pilot surface is formed on said outer circumferential surface of said cylindrical body such that said threaded attachment surface is positioned axially between said first and second pilot surfaces, and

wherein said desired carrier characteristic comprises a gear contact pattern between said pinion gear and said ring gear.

6. The carrier assembly according to claim 5 wherein said pinion cage includes an inner flange that directly abuts against said first pinion gear bearing and an outer flange that directly faces an end face of said carrier shell such that no shims are required to set said gear contact pattern.

7. The carrier assembly according to claim 5 wherein at least a portion of said first pilot surface overlaps said first pinion gear bearing and at least a portion of said second pilot surface overlaps said second pinion gear bearing.

8. A carrier assembly comprising:

a carrier shell;

a ring gear positioned within said carrier shell, said ring gear having a plurality of ring gear teeth;

a pinion gear having a plurality of pinion gear teeth in meshing engagement with said plurality of ring gear teeth; and

a pinion cage having an inner pilot surface to directly face a first inner surface portion of said carrier shell and an outer pilot surface to directly face a second inner surface portion of said carrier shell that is axially spaced from said first inner surface portion, and wherein said pinion cage includes a threaded surface that engages a mating threaded surface on said carrier shell that is positioned between said first and said second inner surface portions, and wherein said pinion cage is selectively adjustable via said threaded surface to provide a desired gear contact pattern between said pinion gear and said ring gear.

9. The carrier assembly according to claim 8 including a splined surface formed within an outer circumferential surface of said pinion cage, and a splined lock member engaging said splined surface once said desired gear contact pattern is achieved to lock said pinion cage to said carrier shell.

10. The carrier assembly according to claim 8 wherein said pinion gear includes an inner end and an outer end, said inner end including an enlarged gear head portion that forms said plurality of pinion gear teeth, and including a first pinion gear bearing positioned adjacent said inner end and a second pinion gear bearing axially spaced from said first pinion gear bearing in a direction toward said outer end, said first and second pinion gear bearings rotatably supporting said pinion gear for rotation relative to said pinion cage.

11. The carrier assembly according to claim 10 wherein said pinion cage includes an inner flange that directly abuts against said first pinion gear bearing and an outer flange that directly faces an end face of said carrier shell such that no shims are required to set said desired gear contact pattern.

12. The carrier assembly according to claim 10 wherein said pinion cage includes a first inner flange that directly abuts against said inner pinion gear bearing such that said inner pinion gear bearing is sandwiched directly between said first inner flange and said enlarged gear head portion, and including a second inner flange that directly abuts against said outer pinion gear bearing.

13. The carrier assembly according to claim 12 wherein said outer end of said pinion gear includes a yoke attachment interface that supports a driveline yoke, said outer pinion gear bearing being directly sandwiched between said second inner flange and an end face of said driveline yoke.

14. The carrier assembly according to claim 12 wherein said pinion cage includes an outer flange axially spaced from said second inner flange in a direction toward said outer end of said pinion gear, said outer flange include a splined surface that engages a splined lock member to lock said pinion cage to said carrier shell.

15. The carrier assembly according to claim 8 including at least one pinion gear bearing that supports said pinion gear for rotation relative to said pinion cage about an axis, and wherein said pinion cage includes a plurality of oil passages spaced circumferentially apart from each other about said axis to direct lubricating fluid to said at least one pinion gear bearing.

16. A method of adjusting gear contact between a pinion gear and a ring gear comprising the steps of:

(a) providing a pinion cage having an outer threaded surface portion, a first pilot surface positioned on one side of the outer threaded surface portion, and a second pilot surface positioned on an opposite side of the outer threaded surface portion;

(b) fitting the first and second pilot surface portions within a carrier shell while threadably attaching the pinion cage to a mating threaded surface on the carrier shell; and

(c) rotating the pinion cage relative to a carrier shell via the threaded attachment to adjust a gear contact position of the pinion gear relative to the ring gear to achieve a desired gear contact pattern.

17. The method according to claim 16 including forming a splined outer surface on the pinion cage and engaging a splined lock member with the splined outer surface subsequent to step (c) to lock the pinion cage to the carrier shell.