Transmission unit with planetary gearing system

A technology for planetary gears and transmissions, applied in belts/chains/gears, vehicle gearboxes, bicycle accessories, etc., which can solve problems such as unrealized deployment length, hindering planetary gear transmission tooth meshing, high energy consumption, etc.

CN103562058AActive Publication Date: 2014-02-05卡斯滕·贝廷
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-02-05

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Abstract

The invention relates to a transmission unit with a planetary gearing system, optionally for bicycles or for trailer bicycles. The transmission unit, which is developed for driving small rear wheels, contains a planetary gearing system with a ring gear (7) which is connected to the bicycle frame (9), a planet carrier (3b) with planet gears (6a, 6b), and one or two sun gears (10, 11). The transmission unit further contains a rear wheel shaft (12) which is coaxial with respect to the sun gears or a rear wheel shaft which has the aforementioned sun gear, and the transmission unit contains a driving mechanism (3) which is coupled to the planet carrier or a driving mechanism (3) which is designed as a planet carrier (3b). The invention is characterized in that a bearing (35) internally bears the rear wheel shaft (12) with respect to the bicycle frame (9) from a radial perspective and between the seat of the rear wheel (40) and the planetary gearing system from an axial perspective, wherein the planetary gearing system and an upstream gear unit, for example a chain drive (1, 2), lie on the same side of the bicycle frame. Thus, upstream belt drives, short distances between the rear wheel and the bottom bracket, and single-arm suspensions in the bicycle frame can be implemented. The transmission unit provides one or two gear ratios.
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Description

technical field

[0001] The invention relates to a transmission unit with a planetary gear transmission according to the preamble of claim 1, optionally for a bicycle with small wheels or for a bicycle trailer. Background technique

[0002] The chain drive is the most popular bicycle drive. In this case, the driving sprocket connected to the pedal is mainly located outside the bicycle frame when viewed axially, and the driven ring gear supported on the rear wheel shaft is mainly arranged inside the bicycle frame and the bicycle frame when viewed axially. between the rear wheels.

[0003] Multi-speed shifting for bicycles is preferably via a chain drive with different sprockets on the pedals and a different ring gear on the rear wheel or by a single-stage chain drive combined with a hub shift in the rear wheel or by both A combination of schemes can be realized. This achieves a total gear ratio of up to 1:4.9 in total (eg SRAM i-motion with chainring combination 48 / 18). Th...

Examples

Embodiment approach

[0052] V-belts or toothed belts connected to a continuous chain drive or a continuous belt drive preceding a variator unit or connected to a spur gear drive preceding a variator unit, shown either by a chain 1 or not separately or not separately The driven wheel 2 driven by the spur gear is operatively connected in relative rotation to the drive 3 of the transmission unit via a shaft-hub connection, wherein the driven wheel 2 is fastened to the drive 3 , for example by means of a safety ring 4 . The driver 3 driven by the driven wheel 2 comprises a driver part 3a and is formed as a planetary carrier 3b of a planetary gearing, viewed axially towards the bicycle frame, according to a particular feature of the invention.

[0053] According to a particular feature of the invention, the driven wheel 2 and the planetary carrier 3b are located axially outside the bicycle frame. This enables installation and removal of the chain 1 without having to remove the rear wheel at the same ti...