Countershaft

• US 9,284,976 B2
• Filed: 03/11/2014
• Issued: 03/15/2016
• Est. Priority Date: 03/09/2013
• Status: Active Grant

• Current Assignee: Waukesha Bearings Corporation
• Original Assignee: Waukesha Bearings Corporation
• Inventors: Blair, Barry, Otto, James L., Gwizdek, Mike
• Primary Examiner(s): Hannon, Thomas R.
• Application Number:
  US14/203,562
• Publication Number:
  US 20140254963A1
• Time in Patent Office: 735 Days
• US Class Current: 1/1
• CPC Class Codes: F16C 17/02 for radial load only
• CPC Class Codes: F16C 17/028 with fixed wedges to generate hydrodynamic pressure, e.g. multi-lobe bearings
• CPC Class Codes: F16C 3/02 Shafts; Axles
• CPC Class Codes: F16C 32/0659 of pockets or grooves
• CPC Class Codes: F16C 32/0685 for radial load only
• CPC Class Codes: F16C 33/1055 from radial inside, e.g. via a passage through the shaft and/or inner sleeve
• CPC Class Codes: F16C 33/107 Grooves for generating pressure

Abstract

A countershaft as disclosed herein may include one or more bearing zones along its axial length. Each bearing zone may include one or more radial holes in fluid communication with one or more grooves, respectively, and one or more axial channels formed along the longitudinal length of the countershaft. Each groove may be positioned adjacent an interface between a rotating member and a non-rotating member and include one or more features therein, such as a profile and/or taper.

Claims

1. A countershaft comprising:

a. an axial channel formed along the longitudinal axis of said countershaft;

b. a first bearing zone formed on an exterior surface of said countershaft, wherein said first bearing zone includes a groove and a taper positioned adjacent one another, and wherein said first bearing zone includes a land positioned adjacent said groove on a side of said groove opposite said taper such that a circumference of said first bearing zone is asymmetric on either side of said groove;

c. a second bearing zone formed on said exterior surface of said countershaft, wherein said second bearing zone includes a groove and a taper positioned adjacent one another, wherein said second bearing zone includes a land positioned adjacent said groove on a side of said groove opposite said taper such that a circumference of said second bearing zone is asymmetric on either side of said groove, and wherein said groove in said first zone and said groove in said second zone are rotationally offset from one another;

d. a first radial hole formed in said countershaft, wherein said first radial hole fluidly connects said axial channel to said groove in said first bearing zone; and

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e. a second radial hole formed in said countershaft, wherein said second radial hole fluidly connects said axial channel to said groove in said second bearing zone.

2. The countershaft according to claim 1 wherein said groove in said first bearing zone further comprises a notch.

3. The countershaft according to claim 2 wherein said groove in said second bearing zone further comprises a notch.

4. The countershaft according to claim 1 wherein said countershaft further comprises a second groove in said first bearing zone and a third radial hole fluidly connecting said axial channel to said second groove in said first bearing zone.

5. The countershaft according to claim 4 wherein said countershaft further comprises a taper positioned adjacent said second groove in said first bearing zone.

6. The countershaft according to claim 4 wherein said countershaft further comprises a second groove in said second bearing zone and a fourth radial hole fluidly connecting said axial channel to said second groove in said second bearing zone.

7. The countershaft according to claim 6 wherein said countershaft further comprises a taper positioned adjacent said second groove in said second bearing zone.

8. The countershaft according to claim 7 wherein said land in said first bearing zone is further defined as having no profile formed therein.

9. The countershaft according to claim 8 wherein said land in said second bearing zone is further defined as having no profile formed therein.

10. A countershaft comprising:

a. an axial channel formed along the longitudinal axis of said countershaft;

b. a first bearing zone formed on an exterior surface of said countershaft, wherein said first bearing zone includes a groove, a taper positioned adjacent said groove on a first side of said groove, and a land positioned adjacent said groove on a second side of said groove such that a circumference of said first bearing zone is asymmetric with respect to said first and second sides said groove, and wherein a radial dimension of said countershaft varies along the circumference thereof between said groove and an interface between said taper and said land;

c. a second bearing zone formed on said exterior surface of said countershaft, wherein said second bearing zone includes a groove, a taper positioned adjacent said groove on a first side of said groove, and a land positioned adjacent said groove on a second side of said groove such that a circumference of said second bearing zone is asymmetric with respect to said first and second sides of said groove, wherein a radial dimension of said countershaft varies along the circumference thereof between said groove and an interface between said taper and said land, and wherein said groove in said first zone and said groove in said second zone are rotationally offset from one another;

d. a first radial hole formed in said countershaft, wherein said first radial hole fluidly connects said axial channel to said groove in said first bearing zone; and

,

e. a second radial hole formed in said countershaft, wherein said second radial hole fluidly connects said axial channel to said groove in said second bearing zone.

11. The countershaft according to claim 10 further comprising:

a. a second groove and a second taper positioned in said first bearing zone; and

,

b. a third radial hole formed in said countershaft, wherein said third radial hole fluidly connects said axial channel to said second groove in said first bearing zone.

12. The countershaft according to claim 11 further comprising:

a. a second groove and a second taper positioned in said second bearing zone; and

,

b. a fourth radial hole formed in said countershaft, wherein said fourth radial hole fluidly connects said axial channel to said second groove in said second bearing zone.

13. The countershaft according to claim 12 wherein said first and second grooves in said first bearing zone are further defined as being rotationally offset from one another by 180 degrees.

14. The countershaft according to claim 13 wherein said first and second grooves in said second bearing zone are further defined as being rotationally offset from one another by 180 degrees.

15. The countershaft according to claim 14 wherein said first groove in said first bearing zone and said first groove in said second bearing zone are further defined as being rotationally offset from one another by an amount between 5 and 179 degrees.

16. A method of accommodating a plurality of forces experienced by a countershaft, said method comprising the steps of:

a. forming a first bearing zone on an exterior surface of said countershaft, wherein said first bearing zone includes a groove and a taper positioned adjacent one another, wherein said taper is positioned adjacent a first side of said groove, and wherein a land is positioned adjacent a second side of said groove such that said first bearing zone is asymmetric with respect to said first and second sides of said groove;

b. forming a second bearing zone on an exterior surface of said countershaft, wherein said second bearing zone includes a groove and a taper positioned adjacent one another, wherein said taper is positioned adjacent a first side of said groove, wherein a land is positioned adjacent a second side of said grove such that said second bearing zone is asymmetric with respect to said first and second sides of said groove, and wherein said groove in said first zone and said groove in said second zone are rotationally offset from one another;

c. supplying a pressurized fluid to an axial channel formed along the longitudinal axis of said countershaft;

d. allowing said pressurized fluid to migrate to said groove in said first bearing zone via a radial hole fluidly connecting said axial channel and said groove in said first bearing zone;

e. allowing said pressurized fluid to migrate to said groove in said second bearing zone via a second radial hole fluidly connecting said axial channel and said groove in said second bearing zone;

f. configuring a profile in said groove and said taper of said first zone to accommodate a first force experienced by said countershaft; and

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g. configuring a profile in said groove and said taper of said second zone to accommodate a second force experienced by said countershaft, wherein said first and second forces are not equal in either a direction or a magnitude.