Bearing assembly utilizing improved clamping arrangement

• US 5,489,156 A
• Filed: 12/19/1994
• Issued: 02/06/1996
• Est. Priority Date: 12/19/1994
• Status: Expired due to Term

• Current Assignee: Baldor Electric Company (ABB Limited)
• Original Assignee: Reliance Electric Industrial Company (ABB Limited)
• Inventors: Martinie, Howard M.
• Primary Examiner(s): Hannon, Thomas R.
• Application Number:
  US08/359,038
• Time in Patent Office: 414 Days
• Field of Search: 384/538, 384/540, 384/581, 384/584, 384/585, 403/370
• US Class Current: 384/538
• CPC Class Codes: F16C 19/38 with two or more rows of rollers
• CPC Class Codes: F16C 2226/16 by wedge action, e.g. by tapered or conical parts
• CPC Class Codes: F16C 23/086 forming a track for rolling elements
• CPC Class Codes: F16C 33/586 outside the space between the races, e.g. end faces or bore of inner ring
• CPC Class Codes: F16C 35/045 with a radial flange to mount the housing
• CPC Class Codes: F16C 35/073 between shaft and inner race ring
• CPC Class Codes: F16C 35/078 using pressure fluid as mounting aid
• CPC Class Codes: Y10T 403/7056 Threaded actuator

Abstract

A bearing assembly includes an improved clamping arrangement for securement to a shaft. The inner ring of the bearing assembly includes a tapered inner surface generally complementary to a tapered outer surface of a tapered adapter. Each of the tapered adapter and the inner ring member include an axial extension portion which are situated to be proximate one another during use. A nut is provided interconnecting the extension portions such that relative axial movement may be effected between the inner ring member and the tapered adapter. As a result, the bearing assembly may be secured to or removed from the shaft.

Claims

1. A bearing assembly for receipt of a shaft therein, said bearing assembly comprising:

a tapered adapter defining a first axial bore for receipt of the shaft therethrough and having a radial slot extending along the length thereof, said tapered adapter further defining a tapered outer surface and including a first extension portion axially extending from a greater diameter end of said tapered outer surface;

a bearing inner ring member defining an inner raceway about an outer surface thereof and further defining a second axial bore having a tapered inner surface for receipt of said tapered adapter therein, said bearing inner ring member including a second extension portion axially extending from a greater diameter portion of said tapered inner surface;

a bearing outer race member defining an outer raceway about an inner surface thereof, said bearing outer race member situated such that said outer raceway is radially outward of said inner raceway generally in axial alignment therewith;

a plurality of bearing elements disposed between said bearing inner raceway and said bearing outer raceway; and

a nut having a first axial portion for receipt around said first extension portion and a second axial portion for receipt around said second extension portion, said nut interconnecting said tapered adapter and said bearing inner ring member to effect relative axial movement therebetween.

2. A bearing assembly as set forth in claim 1, wherein said first extension portion of said tapered adapter defines outer threads and said first axial portion of said nut defines inner threads, said outer threads operatively engaging said inner threads.

3. A bearing assembly as set forth in claim 2, wherein said second extension portion of said bearing inner race member and said second axial portion of said nut define respective circumferential grooves situated during use in radial opposition to define an annular space, and further including at least one arcuate member disposed in said annular space.

4. A bearing assembly as set forth in claim 3, wherein said nut comprises a unitary nut having said first axial portion and said second axial portion.

5. A bearing assembly as set forth in claim 4, wherein said second circumferential groove is defined having sufficient depth to receive said at least one arcuate member during alignment of said first circumferential groove and said second circumferential groove.

6. A bearing assembly as set forth in claim 5, wherein said nut includes at least one radial screw actuatable to maintain said at least one arcuate member partially in both of said first circumferential groove and said second circumferential groove during use.

7. A bearing assembly as set forth in claim 6, wherein each of said at least one arcuate member defines a notch on an outer arcuate surface thereof for receiving a portion of a respective radial screw.

8. A bearing assembly as set forth in claim 3, wherein said nut comprises two annular nut elements connected together and interfacing at said second circumferential groove.

9. A bearing assembly as set forth in claim 1, wherein said second extension portion defines a circumferential groove extending around at least a portion of an outer surface thereof and said second axial portion of said nut defines a circumferential lip extending about at least a portion of an inner surface thereof for engaging said circumferential groove.

10. A bearing assembly as set forth in claim 9, wherein said nut includes a plurality of nut segments adapted to be secured together into a rigid member, each of said plurality of nut segments defining an arcuate shaft receiving portion arranged so that when said nut is secured together said nut segments define a circular interior for receiving said first extension portion and said second extension portion.

11. A bearing assembly as set forth in claim 1, wherein said second extension portion of said tapered adapter defines outer threads and said second axial portion of said nut defines inner threads, said outer threads operatively engaging said inner threads.

12. A bearing assembly as set forth in claim 11, wherein said first extension portion of said tapered adapter includes a circumferential flange and said first axial portion of said nut includes a circumferential groove for receiving said circumferential flange.

13. A bearing assembly as set forth in claim 12, wherein an inner sidewall of said circumferential groove is defined by a flange having an inner diameter greater than an outer diameter of said circumferential flange upon closure of said radial slot in said tapered adapter.

14. A clamping arrangement for securement to an elongated shaft, said clamping arrangement comprising:

a tapered adapter defining an axial bore for receipt of the shaft therethrough, said tapered adapter further defining a tapered outer surface extending between a first end of lesser diameter and a second end of greater diameter than said first end, said tapered adapter further having a first extension portion axially extending from one of said first end and said second end;

an annular element defining an axial bore for receipt of said tapered adapter therein, said annular element further defining a tapered inner surface extending between a third end of greater diameter and a fourth end of lesser diameter than said third end, said annular element further having a second extension portion axially extending from one of said third end and said fourth end such that said second extension portion will be proximate to said first extension portion during use;

one of said first extension portion and said second extension portion defining a first circumferential groove extending about at least a portion of an outer surface thereof, another of said first extension portion and said second extension portion defining threads about an outer surface thereof;

a nut having a first axial portion for receipt around said first extension portion and a second axial portion for receipt around said second extension portion;

one of said first axial portion and said second axial portion having threads defined about an inner surface thereof for engaging said threads defined on a corresponding one of said first extension portion and said second extension portion, another of said first axial portion and said second axial portion defining a second circumferential groove extending about at least a portion of an inner surface thereof radially aligned in use with said first circumferential groove; and

at least one member configured for receipt in said first circumferential groove and said second circumferential groove such that rotation of said nut will effect axial movement of said annular member with respect to said tapered adapter.

15. A clamping arrangement as set forth in claim 14, wherein said first extension portion axially extends from said second end of said tapered adapter and said second extension portion axially extends from said third end of said annular member.

16. A clamping arrangement as set forth in claim 15, wherein said threads are defined on said first extension portion and said first circumferential groove is defined in said second extension portion.

17. A clamping arrangement as set forth in claim 14, wherein said nut comprises a unitary nut having said first axial portion and said second axial portion.

18. A clamping arrangement as set forth in claim 17, wherein said second circumferential groove is defined having sufficient depth to receive said at least one member during alignment of said first circumferential groove and said second circumferential groove.

19. A clamping arrangement as set forth in claim 18, wherein said nut includes at least one radial screw actuatable to maintain said at least one member partially in said first circumferential groove during use.

20. A clamping arrangement as set forth in claim 19, wherein said at least one radial screw comprises a plurality of radial screws circumferentially spaced apart about said nut.

21. A clamping arrangement as set forth in claim 14, wherein said at least one member comprises a pair of substantially semicircular members.

22. A clamping arrangement as set forth in claim 21, wherein each of said substantially semicircular members has a reduced width at respective opposite ends to facilitate clearance during alignment of said first circumferential groove and said second circumferential groove.

23. A clamping arrangement as set forth in claim 21, wherein said nut includes at least one radial screw actuatable to maintain said pair of substantially semicircular members partially in said first circumferential groove during use.

24. A clamping arrangement as set forth in claim 23, wherein each of said pair of substantially semicircular members defines a notch on an outer arcuate surface thereof for receiving a portion of a respective radial screw.

25. A clamping arrangement as set forth in claim 14, wherein said at least one arcuate member comprises a plurality of arcuate members.

26. A clamping arrangement as set forth in claim 25, further comprising a shroud member circumferentially surrounding said plurality of arcuate members.

27. A clamping arrangement as set forth in claim 14, wherein said nut comprises two annular nut elements connected together and interfacing at said second circumferential groove.

28. A clamping arrangement as set forth in claim 14, wherein said nut includes at least one axial screw engaging said second extension portion, said at least one axial screw actuatable to facilitate separation of said tapered adapter and said annular member.

29. A clamping arrangement as set forth in claim 14, wherein said annular member defines a bearing raceway about an outer surface thereof.

30. A clamping arrangement for securement to an elongated shaft, said clamping arrangement comprising:

a tapered adapter defining a first axial bore for receipt of the shaft therethrough, said tapered adapter further defining a tapered outer surface extending between a first end of lesser diameter and a second end of greater diameter than said first end, said tapered adapter further having a first extension portion axially extending from one of said first end and said second end;

a bearing inner ring member defining a bearing raceway about an outer surface thereof, said bearing inner ring member further defining a second axial bore for receipt of said tapered adapter therein, said second axial bore including a tapered inner surface extending between a third end of greater diameter and a fourth end of lesser diameter than said third end;

said bearing inner ring member further having a second extension portion axially extending from one of said third end and said fourth end such that said second extension portion will be proximate to said first extension portion during use, said second extension portion defining a circumferential groove extending about at least a portion of an outer surface thereof;

a nut having a first axial portion for receipt around said first extension portion and a second axial portion for receipt around said second extension portion, said first axial portion having threads defined about an inner surface thereof for engaging said threads defined on said first extension portion, said second axial portion defining a circumferential lip extending about at least a portion of an inner surface thereof for engaging said circumferential groove; and

said nut including a plurality of nut segments adapted to be secured together into a rigid member, each of said plurality of segments defining an arcuate shaft receiving portion arranged so that when said nut is secured together said segments define a circular interior for receiving said first extension portion and said second extension portion,

whereby rotation of said nut will effect axial movement of said bearing inner ring member with respect to said tapered adapter.

31. A clamping arrangement as set forth in claim 30, wherein said first extension portion axially extends from said second end of said tapered adapter and said second extension portion axially extends from said third end of said bearing inner race member.

32. A clamping arrangement as set forth in claim 30, wherein said nut includes two nut segments.

33. A method of securing a bearing assembly to a shaft, said method comprising the steps of:

(a) providing apparatus comprising;

(1) a tapered adapter defining a first axial bore for receipt of the shaft therethrough and having a radial slot extending along the length thereof, said tapered adapter further defining a tapered outer surface and including a first extension portion axially extending from a greater diameter end of said tapered outer surface, said first extension portion defining outer threads thereabout;

(2) a bearing assembly including an inner race member defining a second axial bore having a tapered inner surface for receipt of said tapered adapter therein, said bearing inner ring member including a second extension portion axially extending from a greater diameter portion of said tapered inner surface, said second extension portion defining a first circumferential groove about at least a portion of an outer surface thereof;

(3) a unitary nut having a first axial portion for receipt about first extension portion and a second axial portion for receipt about said second extension portion, said first axial portion defining interior threads and said second axial portion defining a second circumferential groove about at least a portion of the length thereof; and

(4) at least one arcuate member sized to be received in said first and second circumferential grooves;

(b) placing said bearing assembly on said tapered adapter such that said tapered outer surface and said tapered inner surface are generally complementary;

(c) inserting said at least one arcuate member into said second circumferential groove;

(d) threading said nut onto said tapered adapter until said first circumferential groove and said second circumferential groove are in radial alignment;

(e) moving a portion of said at least one arcuate member out of said second circumferential groove and into said first circumferential groove such that said nut and said bearing assembly will be connected; and

(f) further rotating said nut to effect relative axial movement between said bearing assembly and said tapered adapter.

34. A method as set forth in claim 33, wherein said portion of said at least one arcuate member is moved out of said second circumferential groove and into said first circumferential groove by tightening radial set screws provided in said nut.