Gears with damped vibration

• US 4,635,501 A
• Filed: 05/29/1984
• Issued: 01/13/1987
• Est. Priority Date: 08/19/1983
• Status: Expired due to Fees

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Murakami, Kazutomo, Iida, Kazuyoshi, Mizuno, Keiichiro
• Primary Examiner(s): STAAB, LAWRENCE J
• Application Number:
  US06/614,918
• Time in Patent Office: 959 Days
• Field of Search: 74/434, 74/421, 74/574, 74/DIG. 4, 310/74
• US Class Current: 74/433.5
• CPC Class Codes: F16H 55/14 Construction providing resilience or vibration-damping F16H55/06 takes precedence
• CPC Class Codes: Y10S 74/04 Magnetic gearing
• CPC Class Codes: Y10T 74/19865 with flywheel
• CPC Class Codes: Y10T 74/1987 Rotary bodies

Abstract

Gear made of magnetic material is attached with permanent magnet on the web thereof for damping vibration and noise caused when gears are in operation.

Claims

1. A rotary element of magnetizable material having a hub and an outer edge disposed radially outwardly of said hub along with a web between said hub and said outer edge, said web having a side face which is disposed in a plane perpendicular to the axis of rotation of said rotary element, a permanent magnet held magnetically onto said side face such that under non-rotating conditions, said magnet is magnetically and fixedly retained and carried on and by said rotary element, said rotary element being adapted to be mounted on a shaft, said magnet being carried by said rotary element free and clear of and spaced from said shaft, said magnet directly contacting and directly abutting said side face free of any intermediate material between said side face and said magnet and providing for relative rotary movement between said magnet and said rotary element as said rotary element is continuously rotated, whereby said relative rotary movement provides dampening of vibration of said rotary element during continuous rotation of said rotary element.

2. A rotary element according to claim 1 wherein said rotary element has an annular groove, said magnet being disposed within said annular groove.

3. A rotary element according to claim 1, wherein said side face is disposed in a plane perpendicular to the axis of rotation of said rotary element.

4. A rotary element according to claim 1, wherein said magnet has a configuration of an annulus.

5. A rotary element according to claim 1, wherein said magnet has the configuration of a segment of an annulus.

8. A rotary element according to claim 1, wherein said gear wheel has a radially outer enlarged portion on which said gear teeth are formed, said magnet being disposed on said enlarged portion.

6. A rotary element of magnetizable material having a hub and an outer edge disposed radially outwardly of said hub along with a web between said hub and said outer edge, said web having a side face which is disposed in a plane perpendicular to the axis of rotation of said rotary element, a permanent magnet held magnetically onto said side face such that under non-rotating conditions, said magnet is magnetically and fixedly retained and carried on and by said rotary element, said rotary element being adapted to be mounted on a shaft, said magnet being carried by said rotary element free and clear of and spaced from said shaft, said magnet directly contacting and directly abutting said side face free of any intermediate material between said side face and said magnet and providing for relative rotary movement between said magnet and said rotary element as said rotary element is continuously rotated, elastomer means disposed over said magnet, and affixing means affixing said elastomer means to said rotary element such that said relative rotary movement is not precluded by said elastomer means and said affixing means, whereby said relative rotary movement provides dampening of vibration of said rotary element during continuous rotation of said rotary element.

7. A gear wheel of magnetizable having a hub and gear teeth disposed radially outwardly of said hub along with a web between said hub and said gear teeth, said web having a side face which is disposed in a plane perpendicular to the axis of rotation of said gear wheel, a permanent magnet held magnetically onto said side face such that under non-rotating conditions, said magnet is magnetically and fixedly retained and carried on and by said gear wheel, said gear wheel being adapted to be mounted on a shaft, said magnet being carried by said gear wheel free and clear of and spaced from said shaft, said magnet directly contacting and directly abutting said side face free of any intermediate material between said side face and said magnet and providing for relative rotary movement between said magnet and said gear wheel as said gear wheel is continuously rotated, elastomer means disposed over said magnet, and affixing means affixing said elastomer means to said gear wheel such that said relative rotary movement is not precluded by said elastomer means and said affixing means, whereby said relative rotary movement provides dampening of vibration of said gear wheel during continuous rotation of said gear wheel.