Planetary gear mechanism for a bicycle

a technology of planetary gear and bicycle, which is applied in the direction of mechanical equipment, gears, transportation and packaging, etc., can solve the problems of heavy weight and freewheeling of the drive train gear assembly relative to the hub body

Inactive Publication Date: 2013-09-05
THE GATES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution results in a lighter transmission system with predictable power delivery and improved clearance within the bicycle frame, offering efficient and smooth gear shifting with a 20%-30% weight reduction compared to prior art transmissions.

Problems solved by technology

The prior art transmissions have common disadvantages including heavy weight and that each is located in the bicycle rear wheel hub.
Reverse rotation of the annular gear, in a counter-clockwise rotation, results in a freewheeling of the drive train gear assembly relative to the hub body.

Method used

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  • Planetary gear mechanism for a bicycle
  • Planetary gear mechanism for a bicycle
  • Planetary gear mechanism for a bicycle

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Embodiment Construction

[0054]FIG. 1 is a cross-sectional schematic view of the transmission. The invention generally comprises a planetary gear mechanism having an input member connected to a first planetary mechanism, the first planetary mechanism connected coaxially in series to a second planetary mechanism, which second planetary mechanism is connected coaxially in series to a third planetary mechanism, the second planetary mechanism output is a step up in speed from the first planetary mechanism output, the third planetary mechanism output is a step up in speed from the second planetary mechanism output, and the third planetary mechanism connected to an output member.

[0055]The proposed transmission is preferably located in a bicycle bottom bracket, see FIG. 4. Crank arms (see FIG. 4) are attached to each end of the input member 22. Carrier 100 is rigidly connected to the member 22, and thereby rotates with member 22. Carrier 100 further comprises a carrier pin or shaft 101.

[0056]Three planet pinion ge...

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Abstract

A planetary gear mechanism for a bicycle, and more particularly to a planetary gear mechanism comprising a first planetary mechanism connected coaxially in series to a second planetary mechanism, which second planetary mechanism is connected coaxially in series to a third planetary mechanism, the second planetary mechanism output is a step up in speed from the first planetary mechanism output, the third planetary mechanism output is a step up in speed from the second planetary mechanism output.

Description

REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of and claims priority from U.S. non-provisional patent application Ser. No. 12 / 660,861 filed Mar. 5, 2010.FIELD OF THE INVENTION[0002]The invention relates to a planetary gear mechanism for a bicycle, and more particularly to a planetary gear mechanism comprising a first planetary mechanism connected coaxially in series to a second planetary mechanism, which second planetary mechanism is connected coaxially in series to a third planetary mechanism, the second planetary mechanism output is a step up in speed from the first planetary mechanism output, the third planetary mechanism output is a step up in speed from the second planetary mechanism output.BACKGROUND OF THE INVENTION[0003]It is known that bicycles may have internal geared transmissions located in rear hubs. For example, the Shimano Company provides a Shimano Nexus™ eight speed transmission. The transmission comprises an internal geared planetary tra...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B62M11/14
CPCB62M11/145B62M11/18F16H3/663F16H2200/2046F16H2200/201F16H2200/2023F16H2200/003B62M11/14F16H3/66
InventorSERKH, ALEXANDERSCHNEIDER, DEAN
OwnerTHE GATES CORP