Motorcycle steering mechanism

• US 4,573,698 A
• Filed: 10/14/1983
• Issued: 03/04/1986
• Est. Priority Date: 10/14/1982
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Takahashi, Hirotake, Nishikawa, Kenji
• Primary Examiner(s): Peters, Jr., Joseph F.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/541,938
• Time in Patent Office: 872 Days
• Field of Search: 280/279, 280/280, 280/276, 180/219, 384/226, 384/247, 384/147
• US Class Current: 280/279
• CPC Class Codes: B62K 21/06 Bearings specially adapted for steering heads bearings in general F16C
• CPC Class Codes: F16C 19/163 with angular contact
• CPC Class Codes: F16C 19/548 in O-arrangement
• CPC Class Codes: F16C 2326/26 Bicycle steering or suspension in general B62K
• CPC Class Codes: F16C 25/06 Ball or roller bearings

Abstract

A steering mechanism for motorcycles comprising upper and lower angular ball bearings having a swing angle of at least 50% and retained out of contact with one another by a pressure fitted retainer element. Friction rings are provided at the upper and lower ends of the steering column to permit reduction of pressure on the ball bearings, and the pressure on the upper and lower ball bearings is equalized by selective tightening of a nut mechanism attached to the upper end of the steering column.

Claims

1. A handle bar steering device for a motorcycle having a steering column with angular bearings to permit swing steering, wherein said bearings comprise angular ball bearings having a swing angle of at least 50°

, and being retained out of contact with one another by a retainer element, said device comprising a head pipe and friction means between said head pipe and steering column to provide turning friction resistance for the latter, said device further comprising upper and lower angular ball bearings, said upper ball bearings being affixed to a threaded upper portion of said steering column by means of a first nut, tightening of said first nut producing a substantially equal pressure on both said upper and said lower ball bearings, a second nut being threaded upon said threaded upper portion of said steering column, a lock washer being provided between said first and second nuts, each of said first and second nuts having a plurality of stop tabs projecting around its circumference and forming a plurality of stop notches, and said lock washer having a larger and a smaller pair of opposite stop tabs located at 90°

intervals around its circumference, said respective pairs being bent at substantially 90°

angles in respectively opposite directions so as to engage the respective stop notches of said first and second nuts.

2. A device according to claim 1, wherein said friction means comprises an upper and lower friction ring respectively fitted into the upper and lower ends of said head pipe and onto said steering column, to permit reduction of axial pressure on said ball bearings.

3. A device according to claim 2, wherein said friction rings serve as dust covers.

4. A device according to claim 2, wherein said upper friction ring is provided with an annular spring at its interior, said spring generating friction as it is tightened.

5. A handle bar steering device for a motorcycle having a steering column with angular bearings to permit swing steering, a head pipe and friction means between said head pipe and steering column to provide turning friction resistance for the latter, said bearings comprising angular ball bearings having a swing angle of at least 50°

, and being retained out of contact with one another by a retainer element, and said friction means comprising upper and lower friction rings respectively fitted into the upper and lower ends of said head pipe and onto said steering column, to permit reduction of axial pressure on said ball bearings, said upper friction ring being provided with an annular spring at its interior, said spring generating friction as it is tightened.

6. A device according to claim 5, wherein said ball bearings comprise a maximum of fourteen balls retained in an annular arrangement by pressure fitting of said retainer element.

7. A device according to claim 5, comprising upper and lower angular ball bearings, said upper ball bearings being affixed to a threaded upper portion of said steering column by means of a first nut, tightening of said first nut producing a substantially equal pressure on both said upper and said lower ball bearings.

8. A device according to claim 7, including a second nut threaded upon said threaded upper portion of said steering column, a lock washer being provided between said first and second nuts.