Steering wheel assembly

• US 4,625,578 A
• Filed: 01/14/1985
• Issued: 12/02/1986
• Est. Priority Date: 01/18/1984
• Status: Expired due to Fees

• Current Assignee: Nihon Plast Company Limited
• Original Assignee: Nihon Plast Company Limited
• Inventors: Nishijima, Kazuyoshi
• Primary Examiner(s): Staab, Lawrence
• Assistant Examiner(s): Belisario, Martin G.
• Application Number:
  US06/691,107
• Time in Patent Office: 687 Days
• Field of Search: 74/484 R, 74/552, 74/498, 74/803, 200/61.54
• US Class Current: 74/484.00R
• CPC Class Codes: B62D 1/04 Hand wheels
• CPC Class Codes: B62D 1/105 Non-rotatable hubs, e.g. the central part of the steering wheel not rotating
• CPC Class Codes: F16H 1/36 with two central gears coupled by intermeshing orbital gears
• CPC Class Codes: Y10T 74/20256 Steering and controls assemblies
• CPC Class Codes: Y10T 74/20834 Hand wheels

Abstract

An automotive steering wheel assembly has a hub pad kept stationary during rotation of a steering wheel. The hub pad is attached to an upper annular member rotatable about a hub and coaxial to a non-rotatable lower annular member axially spaced from the upper member. A carrier is fixed to the hub and supports a planet gear for rotation about its own axis and for revolution about the axis of the hub in meshing engagement with internal gear teeth formed on the upper and lower members so that rotation of the hub causes the planet gear to revolve about the hub axis to keep the upper member and thus the hub pad apparently stationary. The planet gear is formed thereon with an annular flange having opposite end faces in slidable engagement with opposed faces of the upper and lower members to prevent the upper member from being distorted by the force exerted by a driver to the hub pad.

Claims

1. In a steering wheel assembly of the type that includes:

a steering wheel body including a rim, at least one spoke having a radially outer end connected to said rim and a hub connected to the radially inner end of said spoke and adapted to be detachably secured to a steering shaft of a vehicle, said hub having a substantially cylindrical upper portion;

an upper member defining therein a central opening through which said upper cylindrical portion of said hub rotatably extends, said upper member having an outer peripheral portion formed thereon with internal gear teeth arranged on a circle substantially coaxial to the axis of said hub;

a pad mounted on said upper member to cover the top thereof;

a lower member substantially coaxial to but axially spaced from said upper member, said lower member defining therein a central opening substantially coaxial to the axis of said steering shaft and having an outer peripheral portion formed thereon with internal gear teeth arranged on a circle substantially coaxial to the axis of said steering shaft;

at least one planet gear disposed in meshing engagement with said internal gear teeth of said upper and lower members;

a carrier fixed to said hub for rotation therewith and supporting said planet gear for rotation about the axis thereof; and

means for mechanically connecting said lower member to a stationary member of the vehicle so that said lower member is kept stationary during rotation of said steering wheel body;

the rotation of said steering wheel body causing said planet gear to be revolved about the axis of said steering shaft while said planet gear is rotated about its own axis with the teeth thereof engaged with the internal gear teeth of said upper and lower members so that said upper member is rotated relative to said steering wheel body in a direction opposite to the direction of rotation thereof whereby said upper member is kept apparently stationary;

the improvement which comprises a flange fixed to said planet gear and extending radially outwardly therefrom into the axial space between said upper and lower members, said flange having opposite axial end faces in slidable engagement with said upper and lower members.

2. A steering wheel assembly according to claim 1, wherein said hub has a substantially cylindrical lower portion rotatably extending through said central opening of said lower member.

3. A steering wheel assembly according to claim 2, wherein said mechanically connecting means comprises at least one projection formed on one of said lower member and said stationary member and an aperture formed in the other member and engaged with said projection.

4. A steering wheel assembly according to claim 3, wherein said projection is formed on said lower member and said aperture is formed in said stationary member.

5. A steering wheel assembly according to claim 1, wherein said stationary member is a steering column enclosing said steering shaft and having a portion extending through said central opening in said lower member and wherein said mechanically connecting means comprises at least one screw fixing said lower member to said steering column.

6. A steering wheel assembly according to claim 1, wherein said flange is annular and integral with said planet gear.