Cam follower with clamp

• US 6,478,001 B1
• Filed: 12/18/2001
• Issued: 11/12/2002
• Est. Priority Date: 12/18/2001
• Status: Expired due to Fees

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated), Okay Industries, Inc.
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated), Okay Industries, Inc.
• Inventors: Russell, Shawn H., Burns, John Joseph, Greene, Cynthia Ann
• Primary Examiner(s): Lo, Weilun
• Application Number:
  US10/023,014
• Time in Patent Office: 329 Days
• Field of Search: 123/90-9-, 745/19, 745/59
• US Class Current: 123/90.41
• CPC Class Codes: F01L 1/18 Rocking arms or levers
• CPC Class Codes: F01L 2301/00 Using particular materials
• CPC Class Codes: F01L 2303/00 Manufacturing of components used in valve arrangements
• CPC Class Codes: F01L 2305/00 Valve arrangements comprising rollers
• CPC Class Codes: Y10T 74/20882 Rocker arms

Abstract

A cam follower having a clamp disposed on at least one end thereof. The follower includes two opposing sidewalls interconnected by a lower pallet. A roller is rotatably mounted to and disposed between the sidewalls via needled or journal bearings or other rotatable connection known in the art. A clamp is disposed about an end of the follower to induce compression force in the pallet and possibly act as the valve guide walls. The clamp increases the stiffness of the follower and induces compressive stress in the pallet area thereby increasing fatigue life. The clamp could also increase the length of the valve guide walls for better stability during engine assembly.

Claims

1. A cam follower comprising:

a main body extending from a first end adapted to be pivotally supported on a portion of an internal combustion engine to a second end adapted to engage a valve stem, said main body including;

a pair of spaced apart opposing sidewalls extending from said first end to said second end;

a pallet interconnecting said sidewalls adjacent at least one of said first and second ends; and

at least one clamp disposed about said side walls adjacent said pallet and inducing a compressive force in said pallet.

2. The cam follower according to claim 1, wherein said main body is formed as a one-piece stamped piece of metal.

3. The cam follower according to claim 1, wherein said follower further comprises a roller disposed between and rotatably mounted to said sidewalls to rollingly engage a camshaft.

4. The cam follower according to claim 1, wherein said main body is a unitary body having a substantially U-shaped cross section and said pallet is disposed adjacent a lower portion of each of said side walls.

5. The cam follower according to claim 4, wherein said clamp comprises an inverted substantially U-shaped channel member disposed about said side walls and said pallet adjacent said second end.

6. The cam follower according to claim 1, wherein said pallet is disposed adjacent said second end of said follower, said clamp comprising an inverted substantially U-shaped channel member disposed about said side walls and said pallet, said clamp having an extension extending inward and underneath said pallet.

7. The cam follower according to claim 6, wherein said pallet and has a groove formed on a bottom surface thereof to engage said valve stem and said extension of said clamp terminated adjacent said groove.

8. The cam follower according to claim 1, wherein a recess is formed on an external surface of at least one of said side walls, said clamp being deformed to engage said recess to facilitate retention of said clamp to said main body of said follower.

9. The cam follower according to claim 1, wherein said pallet is disposed adjacent said second end of said follower, said clamp comprising an inverted substantially U-shaped channel member disposed about said side walls and said pallet, said clamp having a portion extending beyond said walls to form opposing valve guide walls.